Merge tag 'iio-for-6.4a' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into char-misc-next

Jonathan writes:

1st set of IIO new device support, features and cleanups for the 6.4 cycle.

New device support
* bosch,bmp280
- Add support for BMP580 - includes significant refactoring and general
driver cleanup + support for non-volatile memory for trimming and config
parameters.
* rohm BU27034
- New driver for this 3 channel ambient light sensor.
- New support library for devices where both integration time and
amplifier gain are configurable. In these cases a scale change
may require changing bother underlying values. This library module
provides code to help with this.
* st,accel
- Add support for IIS328DQ (ID only as compatible wtih LIS331DL)
* st,lsm6dsx
- Add support for ASM330LHB automotive MEMS sensor.
* ti,ads1100, ads1000
- New driver for these 16 bit ADCs.
* ti,tmp117
- Add support for older tmp116 device. Includes some general driver cleanup.

Staging driver drops
* adi,ade7854
- Driver was a very long way from compliant with IIO infrastructure and ABI.
If anyone wants a non staging version of this driver they are better off
starting from scratch. Hence drop it and the associated meter.h header.

Features
* adi,ad7441r
- Add DT binding to set sink current for digital input.
* semtech,sx9324,9360
- Support older register mapping from firmware designed for windows.

Core improvements.
* Move iio_trigger_poll() docs to next to the implementation and add a note
on expected caller context.
* Rename iio_trigger_poll_chained() to iio_trigger_poll_nested() so
as to use more standard / common terminology.
* Improve main ABI docs references to offset and scale for raw values by
making them consistent and clear.

Cleanups and minor fixes:
* adi,ad5592r
- Add GPIO names - useful for debug.
* adi,ad7441r
- Fix current input, loop powered mode configuration setup.
* adi,adis16475
- Fix wrong commented value for minimum advised lower rate.
* adi,admv1013
- Use devm_clk_get_enabled() to reduce boilerplate.
* adi,ads1210
- Fix wrong bits for writing config register (late fix and has
been broken a long time so not rushed upstream)
* amlogic,meson-saradc
- Improve cleanup in error handling if BL30 handshake fails.
* apex-embedded,stx104
- Migrate to regmap and use regmap_read_poll_timeout() to neatly handle
retries.
- Add local mutex to close various races.
- Use define U16_MAX rather than value for limit.
- Improve code readability with minor reorganization.
* atmel,ad91-sama5d2
- Drop trivial dead code.
* kionix,kx022a
- Drop unused structure element.
* linear,ltc2983
- Reorganize bindings doc to enable unevaluatedProperties to be set
in one place for all child nodes.
- Make binding for adi,custom-thermocouple accept signed values.
* maxim,max44000
- Add OF Device matching (of_match_table was not correctly set).
* maxim,max5522
- Missing static
* measurement-computing,cio-dac
- Fix wrong part name in comments.
- Migrate to regmap.
- Improve includes by replacing bitops.h with more direct bits.h
* qcom,pm8xxx-xoadc
- Remove a check that can never fail.
* renesas,rcar-gyroadc
- DT binding documentation improvements.
- Tidy up an unused warning with __maybe_unused.
* semtech,sx_common
- Drop docs for a structure element that doesn't exist.
* semtech,sx9500
- Drop ACPI_PTR() and of_match_ptr() protections that just complicate
the code / block some firmware registration types that would otherwise
work.
* sensiron,sps30
- Comment formatting tidy up.
* st,sensors
- Drop duplicate text in DT binding.
* st,stm32-adc
- Add some missing static markings.
* ti,ads1100
- Use correct return code in dev_err_probe() call.
* x-powers,axp20x_adc - precursor series to simplify addition of AXP192.
- General code cleanup / minor refactoring for better readabilty of code.
- Switch from boolean value to mask for adc_en2 field to avoid hard coding
a mask that will be different in AXP192

* tag 'iio-for-6.4a' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (63 commits)
MAINTAINERS: Add ROHM BU27034
iio: light: ROHM BU27034 Ambient Light Sensor
dt-bindings: iio: light: Support ROHM BU27034
MAINTAINERS: Add IIO gain-time-scale helpers
iio: light: Add gain-time-scale helpers
doc: Make sysfs-bus-iio doc more exact
iio: dac: set variable max5522_channels storage-class-specifier to static
dt-bindings: iio: temperature: ltc2983: Make 'adi,custom-thermocouple' signed
dt-bindings: iio: temperature: ltc2983: Fix child node unevaluated properties
iio: addac: stx104: Use regmap_read_poll_timeout() for conversion poll
iio: addac: stx104: Migrate to the regmap API
iio: addac: stx104: Improve indentation in stx104_write_raw()
iio: addac: stx104: Use define rather than hardcoded limit for write val
iio: addac: stx104: Fix race condition when converting analog-to-digital
iio: addac: stx104: Fix race condition for stx104_write_raw()
dt-bindings: iio: st-sensors: Fix repeated text
staging: iio: resolver: ads1210: fix config mode
iio: adc: ti-ads1100: fix error code in probe()
iio: accel: add support for IIS328DQ variant
dt-bindings: iio: st-sensors: Add IIS328DQ accelerometer
...

Documentation/ABI/testing/sysfs-bus-iio

···
 KernelVersion:	4.3
 Contact:	[e-mail]
 Description:
-		Raw (unscaled no offset etc.) resistance reading that can be processed
-		into an ohm value.
+		Raw (unscaled no offset etc.) resistance reading.
+		Units after application of scale and offset are ohms.
 
 What:		/sys/bus/iio/devices/iio:deviceX/heater_enable
 KernelVersion:	4.1.0
···
 KernelVersion:	4.8
 Contact:	[e-mail]
 Description:
-		Raw (unscaled no offset etc.) electric conductivity reading that
-		can be processed to siemens per meter.
+		Raw (unscaled no offset etc.) electric conductivity reading.
+		Units after application of scale and offset are siemens per
+		meter.
 
 What:		/sys/bus/iio/devices/iio:deviceX/in_countY_raw
 KernelVersion:	4.10
···
 KernelVersion:	4.18
 Contact:	[e-mail]
 Description:
-		Raw (unscaled) phase difference reading from channel Y
-		that can be processed to radians.
+		Raw (unscaled) phase difference reading from channel Y.
+		Units after application of scale and offset are radians.
 
 What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentration_pm1_input
 What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm1_input

Documentation/devicetree/bindings/iio/adc/renesas,rcar-gyroadc.yaml

···
   clock-names:
     const: fck
 
-  power-domains: true
+  power-domains:
+    maxItems: 1
 
-  resets: true
+  resets:
+    maxItems: 1
 
   "#address-cells":
     const: 1
···
   - reg
   - clocks
   - clock-names
+  - power-domains
+  - resets
   - "#address-cells"
   - "#size-cells"
 
···
 
 examples:
   - |
-    #include <dt-bindings/clock/r8a7791-clock.h>
+    #include <dt-bindings/clock/r8a7791-cpg-mssr.h>
     #include <dt-bindings/power/r8a7791-sysc.h>
-    soc {
-        #address-cells = <2>;
-        #size-cells = <2>;
 
-        adc@e6e54000 {
-            compatible = "renesas,r8a7791-gyroadc", "renesas,rcar-gyroadc";
-            reg = <0 0xe6e54000 0 64>;
-            clocks = <&mstp9_clks R8A7791_CLK_GYROADC>;
-            clock-names = "fck";
-            power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
+    adc@e6e54000 {
+        compatible = "renesas,r8a7791-gyroadc", "renesas,rcar-gyroadc";
+        reg = <0xe6e54000 64>;
+        clocks = <&cpg CPG_MOD 901>;
+        clock-names = "fck";
+        power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
+        resets = <&cpg 901>;
 
-            pinctrl-0 = <&adc_pins>;
-            pinctrl-names = "default";
+        #address-cells = <1>;
+        #size-cells = <0>;
 
-            #address-cells = <1>;
-            #size-cells = <0>;
+        adc@0 {
+            reg = <0>;
+            compatible = "maxim,max1162";
+            vref-supply = <&vref_max1162>;
+        };
 
-            adc@0 {
-                reg = <0>;
-                compatible = "maxim,max1162";
-                vref-supply = <&vref_max1162>;
-            };
-
-            adc@1 {
-                reg = <1>;
-                compatible = "maxim,max1162";
-                vref-supply = <&vref_max1162>;
-            };
+        adc@1 {
+            reg = <1>;
+            compatible = "maxim,max1162";
+            vref-supply = <&vref_max1162>;
         };
     };
 ...

Documentation/devicetree/bindings/iio/adc/ti,ads1100.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads1100.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI ADS1100/ADS1000 single channel I2C analog to digital converter
+
+maintainers:
+  - Mike Looijmans <[e-mail]>
+
+description: |
+  Datasheet at: https://www.ti.com/lit/gpn/ads1100
+
+properties:
+  compatible:
+    enum:
+      - ti,ads1100
+      - ti,ads1000
+
+  reg:
+    maxItems: 1
+
+  vdd-supply: true
+
+  "#io-channel-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@49 {
+            compatible = "ti,ads1100";
+            reg = <0x49>;
+        };
+    };
+...

Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml

···
           When not configured as a comparator, the GPO will be treated as an
           output-only GPIO.
 
+      drive-strength-microamp:
+        description: |
+          For channels configured as digital input, this configures the sink
+          current.
+        minimum: 0
+        maximum: 1800
+        default: 0
+        multipleOf: 120
+
     required:
       - reg
 

Documentation/devicetree/bindings/iio/imu/st,lsm6dsx.yaml

···
       - items:
           - const: st,ism330is
           - const: st,lsm6dso16is
+      - items:
+          - const: st,asm330lhb
+          - const: st,asm330lhh
 
   reg:
     maxItems: 1

Documentation/devicetree/bindings/iio/light/rohm,bu27034.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/light/rohm,bu27034.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BU27034 ambient light sensor
+
+maintainers:
+  - Matti Vaittinen <[e-mail]>
+
+description: |
+  ROHM BU27034 is an ambient light sesnor with 3 channels and 3 photo diodes
+  capable of detecting a very wide range of illuminance. Typical application
+  is adjusting LCD and backlight power of TVs and mobile phones.
+  https://fscdn.rohm.com/en/products/databook/datasheet/ic/sensor/light/bu27034nuc-e.pdf
+
+properties:
+  compatible:
+    const: rohm,bu27034
+
+  reg:
+    maxItems: 1
+
+  vdd-supply: true
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      light-sensor@38 {
+        compatible = "rohm,bu27034";
+        reg = <0x38>;
+        vdd-supply = <&vdd>;
+      };
+    };
+
+...

Documentation/devicetree/bindings/iio/pressure/bmp085.yaml

···
     https://www.bosch-sensortec.com/bst/products/all_products/bmp280
     https://www.bosch-sensortec.com/bst/products/all_products/bme280
     https://www.bosch-sensortec.com/bst/products/all_products/bmp380
+    https://www.bosch-sensortec.com/bst/products/all_products/bmp580
 
 properties:
   compatible:
···
       - bosch,bmp280
       - bosch,bme280
       - bosch,bmp380
+      - bosch,bmp580
 
   reg:
     maxItems: 1

Documentation/devicetree/bindings/iio/st,st-sensors.yaml

···
   what type of sensor it is.
   Note that whilst this covers many STMicro MEMs sensors, some more complex
   IMUs need their own bindings.
-  The STMicroelectronics sensor devices are pretty straight-forward I2C or
-  SPI devices, all sharing the same device tree descriptions no matter what
-  type of sensor it is.
 
 maintainers:
   - Denis Ciocca <[e-mail]>
···
           - st,lsm330d-accel
           - st,lsm330dl-accel
           - st,lsm330dlc-accel
+      - items:
+          - const: st,iis328dq
+          - const: st,h3lis331dl-accel
       - description: Silan Accelerometers
         enum:
           - silan,sc7a20

Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml

···
   https://www.analog.com/media/en/technical-documentation/data-sheets/29861fa.pdf
   https://www.analog.com/media/en/technical-documentation/data-sheets/ltm2985.pdf
 
+$defs:
+  sensor-node:
+    type: object
+    description: Sensor node common constraints
+
+    properties:
+      reg:
+        description:
+          Channel number. Connects the sensor to the channel with this number
+          of the device.
+        minimum: 1
+        maximum: 20
+
+      adi,sensor-type:
+        description: Type of sensor connected to the device.
+        $ref: /schemas/types.yaml#/definitions/uint32
+
+    required:
+      - reg
+      - adi,sensor-type
+
+
 properties:
   compatible:
     oneOf:
···
     const: 0
 
 patternProperties:
-  "@([0-9a-f]+)$":
-    type: object
-    description: Sensor.
-
-    properties:
-      reg:
-        description:
-          Channel number. Connects the sensor to the channel with this number
-          of the device.
-        minimum: 1
-        maximum: 20
-
-      adi,sensor-type:
-        description: Type of sensor connected to the device.
-        $ref: /schemas/types.yaml#/definitions/uint32
-
-    required:
-      - reg
-      - adi,sensor-type
-
   "^thermocouple@":
-    type: object
+    $ref: '#/$defs/sensor-node'
+    unevaluatedProperties: false
+
     description: Thermocouple sensor.
 
     properties:
···
         description:
           Used for digitizing custom thermocouples.
           See Page 59 of the datasheet.
-        $ref: /schemas/types.yaml#/definitions/uint64-matrix
+        $ref: /schemas/types.yaml#/definitions/int64-matrix
         minItems: 3
         maxItems: 64
         items:
···
             - adi,custom-thermocouple
 
   "^diode@":
-    type: object
+    $ref: '#/$defs/sensor-node'
+    unevaluatedProperties: false
+
     description: Diode sensor.
 
     properties:
···
         default: 0
 
   "^rtd@":
-    type: object
+    $ref: '#/$defs/sensor-node'
+    unevaluatedProperties: false
     description: RTD sensor.
 
     properties:
···
             - adi,custom-rtd
 
   "^thermistor@":
-    type: object
+    $ref: '#/$defs/sensor-node'
+    unevaluatedProperties: false
     description: Thermistor sensor.
 
     properties:
···
             - adi,custom-thermistor
 
   "^adc@":
-    type: object
+    $ref: '#/$defs/sensor-node'
+    unevaluatedProperties: false
     description: Direct ADC sensor.
 
     properties:
···
         type: boolean
 
   "^temp@":
-    type: object
+    $ref: '#/$defs/sensor-node'
+    unevaluatedProperties: false
     description: Active analog temperature sensor.
 
     properties:
···
       - adi,custom-temp
 
   "^rsense@":
-    type: object
+    $ref: '#/$defs/sensor-node'
+    unevaluatedProperties: false
     description: Sense resistor sensor.
 
     properties:

Documentation/devicetree/bindings/iio/temperature/ti,tmp117.yaml

···
 title: TI TMP117 - Digital temperature sensor with integrated NV memory
 
 description: |
-    TI TMP117 - Digital temperature sensor with integrated NV memory that supports
-    I2C interface.
-      https://www.ti.com/lit/gpn/tmp1
+    TI TMP116/117 - Digital temperature sensor with integrated NV memory that
+    supports I2C interface.
+      https://www.ti.com/lit/gpn/tmp116
+      https://www.ti.com/lit/gpn/tmp117
 
 maintainers:
   - Puranjay Mohan <[e-mail]>
···
 properties:
   compatible:
     enum:
+      - ti,tmp116
       - ti,tmp117
 
   reg:

MAINTAINERS

···
 F:	Documentation/devicetree/bindings/iio/adc/envelope-detector.yaml
 F:	drivers/iio/adc/envelope-detector.c
 
+IIO LIGHT SENSOR GAIN-TIME-SCALE HELPERS
+M:	Matti Vaittinen <[e-mail]>
+L:	[e-mail]
+S:	Maintained
+F:	drivers/iio/light/gain-time-scale-helper.c
+F:	drivers/iio/light/gain-time-scale-helper.h
+
 IIO MULTIPLEXER
 M:	Peter Rosin <[e-mail]>
 L:	[e-mail]
···
 S:	Maintained
 F:	Documentation/devicetree/bindings/iio/light/bh1750.yaml
 F:	drivers/iio/light/bh1750.c
+
+ROHM BU27034 AMBIENT LIGHT SENSOR DRIVER
+M:	Matti Vaittinen <[e-mail]>
+L:	[e-mail]
+S:	Supported
+F:	drivers/iio/light/rohm-bu27034.c
 
 ROHM MULTIFUNCTION BD9571MWV-M PMIC DEVICE DRIVERS
 M:	Marek Vasut <[e-mail]>

drivers/iio/Kconfig

···
 	  (e.g. software triggers). For more info see
 	  Documentation/iio/iio_configfs.rst.
 
+config IIO_GTS_HELPER
+	tristate
+
 config IIO_TRIGGER
 	bool "Enable triggered sampling support"
 	help

drivers/iio/Makefile

···
 industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o
 
 obj-$(CONFIG_IIO_CONFIGFS) += industrialio-configfs.o
+obj-$(CONFIG_IIO_GTS_HELPER) += industrialio-gts-helper.o
 obj-$(CONFIG_IIO_SW_DEVICE) += industrialio-sw-device.o
 obj-$(CONFIG_IIO_SW_TRIGGER) += industrialio-sw-trigger.o
 obj-$(CONFIG_IIO_TRIGGERED_EVENT) += industrialio-triggered-event.o

drivers/iio/accel/bma400_core.c

···
 
 	if (FIELD_GET(BMA400_INT_DRDY_MSK, le16_to_cpu(data->status))) {
 		mutex_unlock(&data->mutex);
-		iio_trigger_poll_chained(data->trig);
+		iio_trigger_poll_nested(data->trig);
 		return IRQ_HANDLED;
 	}
 

drivers/iio/accel/kionix-kx022a.c

···
 	int inc_reg;
 	int ien_reg;
 
-	unsigned int g_range;
 	unsigned int state;
 	unsigned int odr_ns;
 
···
 	mutex_lock(&data->mutex);
 
 	if (data->trigger_enabled) {
-		iio_trigger_poll_chained(data->trig);
+		iio_trigger_poll_nested(data->trig);
 		ret = IRQ_HANDLED;
 	}
 

drivers/iio/accel/mma8452.c

···
 		return IRQ_NONE;
 
 	if (src & MMA8452_INT_DRDY) {
-		iio_trigger_poll_chained(indio_dev->trig);
+		iio_trigger_poll_nested(indio_dev->trig);
 		ret = IRQ_HANDLED;
 	}
 

drivers/iio/accel/msa311.c

···
 	}
 
 	if (new_data_int_enabled)
-		iio_trigger_poll_chained(msa311->new_data_trig);
+		iio_trigger_poll_nested(msa311->new_data_trig);
 
 	return IRQ_HANDLED;
 }

drivers/iio/accel/st_accel.h

···
 #define LIS302DL_ACCEL_DEV_NAME		"lis302dl"
 #define LSM303C_ACCEL_DEV_NAME		"lsm303c_accel"
 #define SC7A20_ACCEL_DEV_NAME		"sc7a20"
+#define IIS328DQ_ACCEL_DEV_NAME		"iis328dq"
 
 
 #ifdef CONFIG_IIO_BUFFER

drivers/iio/accel/st_accel_core.c

···
 		.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 		.sensors_supported = {
 			[0] = H3LIS331DL_ACCEL_DEV_NAME,
+			[1] = IIS328DQ_ACCEL_DEV_NAME,
 		},
 		.ch = (struct iio_chan_spec *)st_accel_12bit_channels,
 		.odr = {

drivers/iio/accel/st_accel_i2c.c

···
 		.compatible = "silan,sc7a20",
 		.data = SC7A20_ACCEL_DEV_NAME,
 	},
+	{
+		.compatible = "st,iis328dq",
+		.data = IIS328DQ_ACCEL_DEV_NAME,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, st_accel_of_match);
···
 	{ LIS302DL_ACCEL_DEV_NAME },
 	{ LSM303C_ACCEL_DEV_NAME },
 	{ SC7A20_ACCEL_DEV_NAME },
+	{ IIS328DQ_ACCEL_DEV_NAME },
 	{},
 };
 MODULE_DEVICE_TABLE(i2c, st_accel_id_table);

drivers/iio/accel/st_accel_spi.c

···
 		.compatible = "st,lsm303c-accel",
 		.data = LSM303C_ACCEL_DEV_NAME,
 	},
+	{
+		.compatible = "st,iis328dq",
+		.data = IIS328DQ_ACCEL_DEV_NAME,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, st_accel_of_match);
···
 	{ LIS3DE_ACCEL_DEV_NAME },
 	{ LIS302DL_ACCEL_DEV_NAME },
 	{ LSM303C_ACCEL_DEV_NAME },
+	{ IIS328DQ_ACCEL_DEV_NAME },
 	{},
 };
 MODULE_DEVICE_TABLE(spi, st_accel_id_table);

drivers/iio/adc/Kconfig

···
 	  This driver can also be built as a module. If so, the module will be
 	  called ti-ads7924.
 
+config TI_ADS1100
+	tristate "Texas Instruments ADS1100 and ADS1000 ADC"
+	depends on I2C
+	help
+	  If you say yes here you get support for Texas Instruments ADS1100 and
+	  ADS1000 ADC chips.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called ti-ads1100.
+
 config TI_ADS7950
 	tristate "Texas Instruments ADS7950 ADC driver"
 	depends on SPI && GPIOLIB

drivers/iio/adc/Makefile

···
 obj-$(CONFIG_TI_ADC128S052) += ti-adc128s052.o
 obj-$(CONFIG_TI_ADC161S626) += ti-adc161s626.o
 obj-$(CONFIG_TI_ADS1015) += ti-ads1015.o
+obj-$(CONFIG_TI_ADS1100) += ti-ads1100.o
 obj-$(CONFIG_TI_ADS7924) += ti-ads7924.o
 obj-$(CONFIG_TI_ADS7950) += ti-ads7950.o
 obj-$(CONFIG_TI_ADS8344) += ti-ads8344.o

drivers/iio/adc/ad7606.c

···
 
 	if (iio_buffer_enabled(indio_dev)) {
 		gpiod_set_value(st->gpio_convst, 0);
-		iio_trigger_poll_chained(st->trig);
+		iio_trigger_poll_nested(st->trig);
 	} else {
 		complete(&st->completion);
 	}

drivers/iio/adc/at91-sama5d2_adc.c

···
 {
 	struct iio_dev *indio_dev = data;
 
-	iio_trigger_poll_chained(indio_dev->trig);
+	iio_trigger_poll_nested(indio_dev->trig);
 }
 
 static int at91_adc_dma_start(struct iio_dev *indio_dev)
···
 	st->dma_st.phys_addr = res->start;
 
 	st->irq = platform_get_irq(pdev, 0);
-	if (st->irq <= 0) {
-		if (!st->irq)
-			st->irq = -ENXIO;
-
+	if (st->irq < 0)
 		return st->irq;
-	}
 
 	st->per_clk = devm_clk_get(&pdev->dev, "adc_clk");
 	if (IS_ERR(st->per_clk))

drivers/iio/adc/axp20x_adc.c

···
  *	Quentin Schulz <[e-mail]>
  */
 
+#include <linux/bitfield.h>
 #include <linux/completion.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
···
 #include <linux/mfd/axp20x.h>
 
 #define AXP20X_ADC_EN1_MASK			GENMASK(7, 0)
-
 #define AXP20X_ADC_EN2_MASK			(GENMASK(3, 2) | BIT(7))
+
 #define AXP22X_ADC_EN1_MASK			(GENMASK(7, 5) | BIT(0))
 
 #define AXP20X_GPIO10_IN_RANGE_GPIO0		BIT(0)
 #define AXP20X_GPIO10_IN_RANGE_GPIO1		BIT(1)
-#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x)	((x) & BIT(0))
-#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x)	(((x) & BIT(0)) << 1)
 
 #define AXP20X_ADC_RATE_MASK			GENMASK(7, 6)
+#define AXP20X_ADC_RATE_HZ(x)			((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK)
+
+#define AXP22X_ADC_RATE_HZ(x)			((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK)
+
 #define AXP813_V_I_ADC_RATE_MASK		GENMASK(5, 4)
 #define AXP813_ADC_RATE_MASK			(AXP20X_ADC_RATE_MASK | AXP813_V_I_ADC_RATE_MASK)
-#define AXP20X_ADC_RATE_HZ(x)			((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK)
-#define AXP22X_ADC_RATE_HZ(x)			((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK)
 #define AXP813_TS_GPIO0_ADC_RATE_HZ(x)		AXP20X_ADC_RATE_HZ(x)
 #define AXP813_V_I_ADC_RATE_HZ(x)		((ilog2((x) / 100) << 4) & AXP813_V_I_ADC_RATE_MASK)
 #define AXP813_ADC_RATE_HZ(x)			(AXP20X_ADC_RATE_HZ(x) | AXP813_V_I_ADC_RATE_HZ(x))
···
 			  struct iio_chan_spec const *chan, int *val)
 {
 	struct axp20x_adc_iio *info = iio_priv(indio_dev);
-	int size = 12;
+	int ret, size;
 
 	/*
 	 * N.B.:  Unlike the Chinese datasheets tell, the charging current is
···
 	else
 		size = 12;
 
-	*val = axp20x_read_variable_width(info->regmap, chan->address, size);
-	if (*val < 0)
-		return *val;
+	ret = axp20x_read_variable_width(info->regmap, chan->address, size);
+	if (ret < 0)
+		return ret;
 
+	*val = ret;
 	return IIO_VAL_INT;
 }
 
···
 			  struct iio_chan_spec const *chan, int *val)
 {
 	struct axp20x_adc_iio *info = iio_priv(indio_dev);
+	int ret;
 
-	*val = axp20x_read_variable_width(info->regmap, chan->address, 12);
-	if (*val < 0)
-		return *val;
+	ret = axp20x_read_variable_width(info->regmap, chan->address, 12);
+	if (ret < 0)
+		return ret;
 
+	*val = ret;
 	return IIO_VAL_INT;
 }
 
···
 			  struct iio_chan_spec const *chan, int *val)
 {
 	struct axp20x_adc_iio *info = iio_priv(indio_dev);
+	int ret;
 
-	*val = axp20x_read_variable_width(info->regmap, chan->address, 12);
-	if (*val < 0)
-		return *val;
+	ret = axp20x_read_variable_width(info->regmap, chan->address, 12);
+	if (ret < 0)
+		return ret;
 
+	*val = ret;
 	return IIO_VAL_INT;
 }
 
···
 				     int *val)
 {
 	struct axp20x_adc_iio *info = iio_priv(indio_dev);
+	unsigned int regval;
 	int ret;
 
-	ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val);
+	ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, &regval);
 	if (ret < 0)
 		return ret;
 
 	switch (channel) {
 	case AXP20X_GPIO0_V:
-		*val &= AXP20X_GPIO10_IN_RANGE_GPIO0;
+		regval = FIELD_GET(AXP20X_GPIO10_IN_RANGE_GPIO0, regval);
 		break;
 
 	case AXP20X_GPIO1_V:
-		*val &= AXP20X_GPIO10_IN_RANGE_GPIO1;
+		regval = FIELD_GET(AXP20X_GPIO10_IN_RANGE_GPIO1, regval);
 		break;
 
 	default:
 		return -EINVAL;
 	}
 
-	*val = *val ? 700000 : 0;
-
+	*val = regval ? 700000 : 0;
 	return IIO_VAL_INT;
 }
 
···
 			    long mask)
 {
 	struct axp20x_adc_iio *info = iio_priv(indio_dev);
-	unsigned int reg, regval;
+	unsigned int regmask, regval;
 
 	/*
 	 * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets
···
 	if (val != 0 && val != 700000)
 		return -EINVAL;
 
-	val = val ? 1 : 0;
-
 	switch (chan->channel) {
 	case AXP20X_GPIO0_V:
-		reg = AXP20X_GPIO10_IN_RANGE_GPIO0;
-		regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(val);
+		regmask = AXP20X_GPIO10_IN_RANGE_GPIO0;
+		regval = FIELD_PREP(AXP20X_GPIO10_IN_RANGE_GPIO0, !!val);
 		break;
 
 	case AXP20X_GPIO1_V:
-		reg = AXP20X_GPIO10_IN_RANGE_GPIO1;
-		regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(val);
+		regmask = AXP20X_GPIO10_IN_RANGE_GPIO1;
+		regval = FIELD_PREP(AXP20X_GPIO10_IN_RANGE_GPIO1, !!val);
 		break;
 
 	default:
 		return -EINVAL;
 	}
 
-	return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg,
-				  regval);
+	return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, regmask, regval);
 }
 
 static const struct iio_info axp20x_adc_iio_info = {
···
 	int				num_channels;
 	struct iio_chan_spec const	*channels;
 	unsigned long			adc_en1_mask;
+	unsigned long			adc_en2_mask;
 	int				(*adc_rate)(struct axp20x_adc_iio *info,
 						    int rate);
-	bool				adc_en2;
 	struct iio_map			*maps;
 };
 
···
 	.num_channels = ARRAY_SIZE(axp20x_adc_channels),
 	.channels = axp20x_adc_channels,
 	.adc_en1_mask = AXP20X_ADC_EN1_MASK,
+	.adc_en2_mask = AXP20X_ADC_EN2_MASK,
 	.adc_rate = axp20x_adc_rate,
-	.adc_en2 = true,
 	.maps = axp20x_maps,
 };
 
···
 	.channels = axp22x_adc_channels,
 	.adc_en1_mask = AXP22X_ADC_EN1_MASK,
 	.adc_rate = axp22x_adc_rate,
-	.adc_en2 = false,
 	.maps = axp22x_maps,
 };
 
···
 	.channels = axp813_adc_channels,
 	.adc_en1_mask = AXP22X_ADC_EN1_MASK,
 	.adc_rate = axp813_adc_rate,
-	.adc_en2 = false,
 	.maps = axp22x_maps,
 };
 
···
 	/* Enable the ADCs on IP */
 	regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask);
 
-	if (info->data->adc_en2)
-		/* Enable GPIO0/1 and internal temperature ADCs */
+	if (info->data->adc_en2_mask)
 		regmap_update_bits(info->regmap, AXP20X_ADC_EN2,
-				   AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK);
+				   info->data->adc_en2_mask,
+				   info->data->adc_en2_mask);
 
 	/* Configure ADCs rate */
 	info->data->adc_rate(info, 100);
···
 fail_map:
 	regmap_write(info->regmap, AXP20X_ADC_EN1, 0);
 
-	if (info->data->adc_en2)
+	if (info->data->adc_en2_mask)
 		regmap_write(info->regmap, AXP20X_ADC_EN2, 0);
 
 	return ret;
···
 
 	regmap_write(info->regmap, AXP20X_ADC_EN1, 0);
 
-	if (info->data->adc_en2)
+	if (info->data->adc_en2_mask)
 		regmap_write(info->regmap, AXP20X_ADC_EN2, 0);
 
 	return 0;

drivers/iio/adc/max11410.c

···
 	struct max11410_state *st = iio_priv(indio_dev);
 
 	if (iio_buffer_enabled(indio_dev))
-		iio_trigger_poll_chained(st->trig);
+		iio_trigger_poll_nested(st->trig);
 	else
 		complete(&st->completion);
 

drivers/iio/adc/meson_saradc.c

···
 	return ret;
 }
 
-static int meson_sar_adc_hw_disable(struct iio_dev *indio_dev)
+static void meson_sar_adc_hw_disable(struct iio_dev *indio_dev)
 {
 	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 	int ret;
 
+	/*
+	 * If taking the lock fails we have to assume that BL30 is broken. The
+	 * best we can do then is to release the resources anyhow.
+	 */
 	ret = meson_sar_adc_lock(indio_dev);
 	if (ret)
-		return ret;
+		dev_err(indio_dev->dev.parent, "Failed to lock ADC (%pE)\n", ERR_PTR(ret));
 
 	clk_disable_unprepare(priv->adc_clk);
 
···
 
 	regulator_disable(priv->vref);
 
-	meson_sar_adc_unlock(indio_dev);
-
-	return 0;
+	if (!ret)
+		meson_sar_adc_unlock(indio_dev);
 }
 
 static irqreturn_t meson_sar_adc_irq(int irq, void *data)
···
 
 	iio_device_unregister(indio_dev);
 
-	return meson_sar_adc_hw_disable(indio_dev);
+	meson_sar_adc_hw_disable(indio_dev);
+
+	return 0;
 }
 
 static int meson_sar_adc_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 
-	return meson_sar_adc_hw_disable(indio_dev);
+	meson_sar_adc_hw_disable(indio_dev);
+
+	return 0;
 }
 
 static int meson_sar_adc_resume(struct device *dev)

drivers/iio/adc/qcom-pm8xxx-xoadc.c

···
 	/* Find the right channel setting */
 	chid = 0;
 	hwchan = &hw_channels[0];
-	while (hwchan && hwchan->datasheet_name) {
+	while (hwchan->datasheet_name) {
 		if (hwchan->pre_scale_mux == pre_scale_mux &&
 		    hwchan->amux_channel == amux_channel)
 			break;

drivers/iio/adc/rcar-gyroadc.c

···
 
 MODULE_DEVICE_TABLE(of, rcar_gyroadc_match);
 
-static const struct of_device_id rcar_gyroadc_child_match[] = {
+static const struct of_device_id rcar_gyroadc_child_match[] __maybe_unused = {
 	/* Mode 1 ADCs */
 	{
 		.compatible	= "fujitsu,mb88101a",

drivers/iio/adc/stm32-adc.c

···
 	.irq_clear = stm32f4_adc_irq_clear,
 };
 
-const unsigned int stm32_adc_min_ts_h7[] = { 0, 0, 0, 4300, 9000 };
+static const unsigned int stm32_adc_min_ts_h7[] = { 0, 0, 0, 4300, 9000 };
 static_assert(ARRAY_SIZE(stm32_adc_min_ts_h7) == STM32_ADC_INT_CH_NB);
 
 static const struct stm32_adc_cfg stm32h7_adc_cfg = {
···
 	.ts_int_ch = stm32_adc_min_ts_h7,
 };
 
-const unsigned int stm32_adc_min_ts_mp1[] = { 100, 100, 100, 4300, 9800 };
+static const unsigned int stm32_adc_min_ts_mp1[] = { 100, 100, 100, 4300, 9800 };
 static_assert(ARRAY_SIZE(stm32_adc_min_ts_mp1) == STM32_ADC_INT_CH_NB);
 
 static const struct stm32_adc_cfg stm32mp1_adc_cfg = {
···
 	.ts_int_ch = stm32_adc_min_ts_mp1,
 };
 
-const unsigned int stm32_adc_min_ts_mp13[] = { 100, 0, 0, 4300, 9800 };
+static const unsigned int stm32_adc_min_ts_mp13[] = { 100, 0, 0, 4300, 9800 };
 static_assert(ARRAY_SIZE(stm32_adc_min_ts_mp13) == STM32_ADC_INT_CH_NB);
 
 static const struct stm32_adc_cfg stm32mp13_adc_cfg = {

drivers/iio/adc/ti-ads1100.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ADS1100 - Texas Instruments Analog-to-Digital Converter
+ *
+ * Copyright (c) 2023, Topic Embedded Products
+ *
+ * Datasheet: https://www.ti.com/lit/gpn/ads1100
+ * IIO driver for ADS1100 and ADS1000 ADC 16-bit I2C
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/units.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/types.h>
+
+/* The ADS1100 has a single byte config register */
+
+/* Conversion in progress bit */
+#define ADS1100_CFG_ST_BSY	BIT(7)
+/* Single conversion bit */
+#define ADS1100_CFG_SC		BIT(4)
+/* Data rate */
+#define ADS1100_DR_MASK		GENMASK(3, 2)
+/* Gain */
+#define ADS1100_PGA_MASK	GENMASK(1, 0)
+
+#define ADS1100_CONTINUOUS	0
+#define	ADS1100_SINGLESHOT	ADS1100_CFG_SC
+
+#define ADS1100_SLEEP_DELAY_MS	2000
+
+static const int ads1100_data_rate[] = { 128, 32, 16, 8 };
+static const int ads1100_data_rate_bits[] = { 12, 14, 15, 16 };
+
+struct ads1100_data {
+	struct i2c_client *client;
+	struct regulator *reg_vdd;
+	struct mutex lock;
+	int scale_avail[2 * 4]; /* 4 gain settings */
+	u8 config;
+	bool supports_data_rate; /* Only the ADS1100 can select the rate */
+};
+
+static const struct iio_chan_spec ads1100_channel = {
+	.type = IIO_VOLTAGE,
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+	.info_mask_shared_by_all =
+	    BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	.info_mask_shared_by_all_available =
+	    BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	.scan_type = {
+		      .sign = 's',
+		      .realbits = 16,
+		      .storagebits = 16,
+		      .endianness = IIO_CPU,
+		       },
+	.datasheet_name = "AIN",
+};
+
+static int ads1100_set_config_bits(struct ads1100_data *data, u8 mask, u8 value)
+{
+	int ret;
+	u8 config = (data->config & ~mask) | (value & mask);
+
+	if (data->config == config)
+		return 0;	/* Already done */
+
+	ret = i2c_master_send(data->client, &config, 1);
+	if (ret < 0)
+		return ret;
+
+	data->config = config;
+
+	return 0;
+};
+
+static int ads1100_data_bits(struct ads1100_data *data)
+{
+	return ads1100_data_rate_bits[FIELD_GET(ADS1100_DR_MASK, data->config)];
+}
+
+static int ads1100_get_adc_result(struct ads1100_data *data, int chan, int *val)
+{
+	int ret;
+	__be16 buffer;
+	s16 value;
+
+	if (chan != 0)
+		return -EINVAL;
+
+	ret = pm_runtime_resume_and_get(&data->client->dev);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_master_recv(data->client, (char *)&buffer, sizeof(buffer));
+
+	pm_runtime_mark_last_busy(&data->client->dev);
+	pm_runtime_put_autosuspend(&data->client->dev);
+
+	if (ret < 0) {
+		dev_err(&data->client->dev, "I2C read fail: %d\n", ret);
+		return ret;
+	}
+
+	/* Value is always 16-bit 2's complement */
+	value = be16_to_cpu(buffer);
+
+	/* Shift result to compensate for bit resolution vs. sample rate */
+	value <<= 16 - ads1100_data_bits(data);
+
+	*val = sign_extend32(value, 15);
+
+	return 0;
+}
+
+static int ads1100_set_scale(struct ads1100_data *data, int val, int val2)
+{
+	int microvolts;
+	int gain;
+
+	/* With Vdd between 2.7 and 5V, the scale is always below 1 */
+	if (val)
+		return -EINVAL;
+
+	if (!val2)
+		return -EINVAL;
+
+	microvolts = regulator_get_voltage(data->reg_vdd);
+	/*
+	 * val2 is in 'micro' units, n = val2 / 1000000
+	 * result must be millivolts, d = microvolts / 1000
+	 * the full-scale value is d/n, corresponds to 2^15,
+	 * hence the gain = (d / n) >> 15, factoring out the 1000 and moving the
+	 * bitshift so everything fits in 32-bits yields this formula.
+	 */
+	gain = DIV_ROUND_CLOSEST(microvolts, BIT(15)) * MILLI / val2;
+	if (gain < BIT(0) || gain > BIT(3))
+		return -EINVAL;
+
+	ads1100_set_config_bits(data, ADS1100_PGA_MASK, ffs(gain) - 1);
+
+	return 0;
+}
+
+static int ads1100_set_data_rate(struct ads1100_data *data, int chan, int rate)
+{
+	unsigned int i;
+	unsigned int size;
+
+	size = data->supports_data_rate ? ARRAY_SIZE(ads1100_data_rate) : 1;
+	for (i = 0; i < size; i++) {
+		if (ads1100_data_rate[i] == rate)
+			return ads1100_set_config_bits(data, ADS1100_DR_MASK,
+						       FIELD_PREP(ADS1100_DR_MASK, i));
+	}
+
+	return -EINVAL;
+}
+
+static int ads1100_get_vdd_millivolts(struct ads1100_data *data)
+{
+	return regulator_get_voltage(data->reg_vdd) / (MICRO / MILLI);
+}
+
+static void ads1100_calc_scale_avail(struct ads1100_data *data)
+{
+	int millivolts = ads1100_get_vdd_millivolts(data);
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(data->scale_avail) / 2; i++) {
+		data->scale_avail[i * 2 + 0] = millivolts;
+		data->scale_avail[i * 2 + 1] = 15 + i;
+	}
+}
+
+static int ads1100_read_avail(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      const int **vals, int *type, int *length,
+			      long mask)
+{
+	struct ads1100_data *data = iio_priv(indio_dev);
+
+	if (chan->type != IIO_VOLTAGE)
+		return -EINVAL;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*type = IIO_VAL_INT;
+		*vals = ads1100_data_rate;
+		if (data->supports_data_rate)
+			*length = ARRAY_SIZE(ads1100_data_rate);
+		else
+			*length = 1;
+		return IIO_AVAIL_LIST;
+	case IIO_CHAN_INFO_SCALE:
+		*type = IIO_VAL_FRACTIONAL_LOG2;
+		*vals = data->scale_avail;
+		*length = ARRAY_SIZE(data->scale_avail);
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ads1100_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan, int *val,
+			    int *val2, long mask)
+{
+	int ret;
+	struct ads1100_data *data = iio_priv(indio_dev);
+
+	mutex_lock(&data->lock);
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			break;
+
+		ret = ads1100_get_adc_result(data, chan->address, val);
+		if (ret >= 0)
+			ret = IIO_VAL_INT;
+		iio_device_release_direct_mode(indio_dev);
+		break;
+	case IIO_CHAN_INFO_SCALE:
+		/* full-scale is the supply voltage in millivolts */
+		*val = ads1100_get_vdd_millivolts(data);
+		*val2 = 15 + FIELD_GET(ADS1100_PGA_MASK, data->config);
+		ret = IIO_VAL_FRACTIONAL_LOG2;
+		break;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val = ads1100_data_rate[FIELD_GET(ADS1100_DR_MASK,
+						   data->config)];
+		ret = IIO_VAL_INT;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static int ads1100_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan, int val,
+			     int val2, long mask)
+{
+	struct ads1100_data *data = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&data->lock);
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		ret = ads1100_set_scale(data, val, val2);
+		break;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		ret = ads1100_set_data_rate(data, chan->address, val);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static const struct iio_info ads1100_info = {
+	.read_avail = ads1100_read_avail,
+	.read_raw = ads1100_read_raw,
+	.write_raw = ads1100_write_raw,
+};
+
+static int ads1100_setup(struct ads1100_data *data)
+{
+	int ret;
+	u8 buffer[3];
+
+	/* Setup continuous sampling mode at 8sps */
+	buffer[0] = ADS1100_DR_MASK | ADS1100_CONTINUOUS;
+	ret = i2c_master_send(data->client, buffer, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_master_recv(data->client, buffer, sizeof(buffer));
+	if (ret < 0)
+		return ret;
+
+	/* Config register returned in third byte, strip away the busy status */
+	data->config = buffer[2] & ~ADS1100_CFG_ST_BSY;
+
+	/* Detect the sample rate capability by checking the DR bits */
+	data->supports_data_rate = FIELD_GET(ADS1100_DR_MASK, buffer[2]) != 0;
+
+	return 0;
+}
+
+static void ads1100_reg_disable(void *reg)
+{
+	regulator_disable(reg);
+}
+
+static void ads1100_disable_continuous(void *data)
+{
+	ads1100_set_config_bits(data, ADS1100_CFG_SC, ADS1100_SINGLESHOT);
+}
+
+static int ads1100_probe(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev;
+	struct ads1100_data *data;
+	struct device *dev = &client->dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	dev_set_drvdata(dev, data);
+	data->client = client;
+	mutex_init(&data->lock);
+
+	indio_dev->name = "ads1100";
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = &ads1100_channel;
+	indio_dev->num_channels = 1;
+	indio_dev->info = &ads1100_info;
+
+	data->reg_vdd = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(data->reg_vdd))
+		return dev_err_probe(dev, PTR_ERR(data->reg_vdd),
+				     "Failed to get vdd regulator\n");
+
+	ret = regulator_enable(data->reg_vdd);
+	if (ret < 0)
+		return dev_err_probe(dev, ret,
+				     "Failed to enable vdd regulator\n");
+
+	ret = devm_add_action_or_reset(dev, ads1100_reg_disable, data->reg_vdd);
+	if (ret)
+		return ret;
+
+	ret = ads1100_setup(data);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to communicate with device\n");
+
+	ret = devm_add_action_or_reset(dev, ads1100_disable_continuous, data);
+	if (ret)
+		return ret;
+
+	ads1100_calc_scale_avail(data);
+
+	pm_runtime_set_autosuspend_delay(dev, ADS1100_SLEEP_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_active(dev);
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to enable pm_runtime\n");
+
+	ret = devm_iio_device_register(dev, indio_dev);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to register IIO device\n");
+
+	return 0;
+}
+
+static int ads1100_runtime_suspend(struct device *dev)
+{
+	struct ads1100_data *data = dev_get_drvdata(dev);
+
+	ads1100_set_config_bits(data, ADS1100_CFG_SC, ADS1100_SINGLESHOT);
+	regulator_disable(data->reg_vdd);
+
+	return 0;
+}
+
+static int ads1100_runtime_resume(struct device *dev)
+{
+	struct ads1100_data *data = dev_get_drvdata(dev);
+	int ret;
+
+	ret = regulator_enable(data->reg_vdd);
+	if (ret) {
+		dev_err(&data->client->dev, "Failed to enable Vdd\n");
+		return ret;
+	}
+
+	/*
+	 * We'll always change the mode bit in the config register, so there is
+	 * no need here to "force" a write to the config register. If the device
+	 * has been power-cycled, we'll re-write its config register now.
+	 */
+	return ads1100_set_config_bits(data, ADS1100_CFG_SC,
+				       ADS1100_CONTINUOUS);
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(ads1100_pm_ops,
+				 ads1100_runtime_suspend,
+				 ads1100_runtime_resume,
+				 NULL);
+
+static const struct i2c_device_id ads1100_id[] = {
+	{ "ads1100" },
+	{ "ads1000" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, ads1100_id);
+
+static const struct of_device_id ads1100_of_match[] = {
+	{.compatible = "ti,ads1100" },
+	{.compatible = "ti,ads1000" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, ads1100_of_match);
+
+static struct i2c_driver ads1100_driver = {
+	.driver = {
+		   .name = "ads1100",
+		   .of_match_table = ads1100_of_match,
+		   .pm = pm_ptr(&ads1100_pm_ops),
+	},
+	.probe_new = ads1100_probe,
+	.id_table = ads1100_id,
+};
+
+module_i2c_driver(ads1100_driver);
+
+MODULE_AUTHOR("Mike Looijmans <[e-mail]>");
+MODULE_DESCRIPTION("Texas Instruments ADS1100 ADC driver");
+MODULE_LICENSE("GPL");

drivers/iio/addac/Kconfig

···
 	tristate "Apex Embedded Systems STX104 driver"
 	depends on PC104 && X86
 	select ISA_BUS_API
+	select REGMAP_MMIO
 	select GPIOLIB
+	select GPIO_REGMAP
 	help
 	  Say yes here to build support for the Apex Embedded Systems STX104
 	  integrated analog PC/104 card.

drivers/iio/addac/ad74413r.c

···
 
 struct ad74413r_channel_config {
 	u32		func;
+	u32		drive_strength;
 	bool		gpo_comparator;
 	bool		initialized;
 };
···
 #define AD74413R_REG_ADC_CONFIG_X(x)		(0x05 + (x))
 #define AD74413R_ADC_CONFIG_RANGE_MASK		GENMASK(7, 5)
 #define AD74413R_ADC_CONFIG_REJECTION_MASK	GENMASK(4, 3)
+#define AD74413R_ADC_CONFIG_CH_200K_TO_GND	BIT(2)
 #define AD74413R_ADC_RANGE_10V			0b000
 #define AD74413R_ADC_RANGE_2P5V_EXT_POW		0b001
 #define AD74413R_ADC_RANGE_2P5V_INT_POW		0b010
···
 #define AD74413R_REG_DIN_CONFIG_X(x)	(0x09 + (x))
 #define AD74413R_DIN_DEBOUNCE_MASK	GENMASK(4, 0)
 #define AD74413R_DIN_DEBOUNCE_LEN	BIT(5)
+#define AD74413R_DIN_SINK_MASK		GENMASK(9, 6)
 
 #define AD74413R_REG_DAC_CODE_X(x)	(0x16 + (x))
 #define AD74413R_DAC_CODE_MAX		GENMASK(12, 0)
···
 				  AD74413R_DIN_DEBOUNCE_MASK,
 				  val);
 }
+
+static int ad74413r_set_comp_drive_strength(struct ad74413r_state *st,
+					    unsigned int offset,
+					    unsigned int strength)
+{
+	strength = min(strength, 1800U);
+
+	return regmap_update_bits(st->regmap, AD74413R_REG_DIN_CONFIG_X(offset),
+				  AD74413R_DIN_SINK_MASK,
+				  FIELD_PREP(AD74413R_DIN_SINK_MASK, strength / 120));
+}
+
 
 static void ad74413r_gpio_set(struct gpio_chip *chip,
 			      unsigned int offset, int val)
···
 static int ad74413r_set_channel_function(struct ad74413r_state *st,
 					 unsigned int channel, u8 func)
 {
-	return regmap_update_bits(st->regmap,
+	int ret;
+
+	ret = regmap_update_bits(st->regmap,
 				  AD74413R_REG_CH_FUNC_SETUP_X(channel),
 				  AD74413R_CH_FUNC_SETUP_MASK, func);
+	if (ret)
+		return ret;
+
+	if (func == CH_FUNC_CURRENT_INPUT_LOOP_POWER)
+		ret = regmap_set_bits(st->regmap,
+				      AD74413R_REG_ADC_CONFIG_X(channel),
+				      AD74413R_ADC_CONFIG_CH_200K_TO_GND);
+
+	return ret;
 }
 
 static int ad74413r_set_adc_conv_seq(struct ad74413r_state *st,
···
 	AD74413R_ADC_CURRENT_CHANNEL,
 };
 
+static struct iio_chan_spec ad74413r_current_input_loop_channels[] = {
+	AD74413R_DAC_CHANNEL(IIO_CURRENT, BIT(IIO_CHAN_INFO_SCALE)),
+	AD74413R_ADC_CURRENT_CHANNEL,
+};
+
 static struct iio_chan_spec ad74413r_resistance_input_channels[] = {
 	AD74413R_ADC_CHANNEL(IIO_RESISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
 };
···
 	[CH_FUNC_CURRENT_OUTPUT] = AD74413R_CHANNELS(current_output),
 	[CH_FUNC_VOLTAGE_INPUT] = AD74413R_CHANNELS(voltage_input),
 	[CH_FUNC_CURRENT_INPUT_EXT_POWER] = AD74413R_CHANNELS(current_input),
-	[CH_FUNC_CURRENT_INPUT_LOOP_POWER] = AD74413R_CHANNELS(current_input),
+	[CH_FUNC_CURRENT_INPUT_LOOP_POWER] = AD74413R_CHANNELS(current_input_loop),
 	[CH_FUNC_RESISTANCE_INPUT] = AD74413R_CHANNELS(resistance_input),
 	[CH_FUNC_DIGITAL_INPUT_LOGIC] = AD74413R_CHANNELS(digital_input),
 	[CH_FUNC_DIGITAL_INPUT_LOOP_POWER] = AD74413R_CHANNELS(digital_input),
···
 
 	config->gpo_comparator = fwnode_property_read_bool(channel_node,
 		"adi,gpo-comparator");
+
+	fwnode_property_read_u32(channel_node, "drive-strength-microamp",
+				 &config->drive_strength);
 
 	if (!config->gpo_comparator)
 		st->num_gpo_gpios++;
···
 	unsigned int gpo_gpio_i = 0;
 	unsigned int i;
 	u8 gpo_config;
+	u32 strength;
 	int ret;
 
 	for (i = 0; i < AD74413R_CHANNEL_MAX; i++) {
···
 		if (config->func == CH_FUNC_DIGITAL_INPUT_LOGIC ||
 		    config->func == CH_FUNC_DIGITAL_INPUT_LOOP_POWER)
 			st->comp_gpio_offsets[comp_gpio_i++] = i;
+
+		strength = config->drive_strength;
+		ret = ad74413r_set_comp_drive_strength(st, i, strength);
+		if (ret)
+			return ret;
 
 		ret = ad74413r_set_gpo_config(st, i, gpo_config);
 		if (ret)

drivers/iio/addac/stx104.c

···
  * IIO driver for the Apex Embedded Systems STX104
  * Copyright (C) 2016 William Breathitt Gray
  */
-#include <linux/bitops.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
 #include <linux/device.h>
-#include <linux/errno.h>
-#include <linux/gpio/driver.h>
+#include <linux/err.h>
+#include <linux/gpio/regmap.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/types.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
 #include <linux/isa.h>
 #include <linux/kernel.h>
+#include <linux/limits.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
-#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
 #include <linux/types.h>
 
 #define STX104_OUT_CHAN(chan) {				\
···
 module_param_hw_array(base, uint, ioport, &num_stx104, 0);
 MODULE_PARM_DESC(base, "Apex Embedded Systems STX104 base addresses");
 
-/**
- * struct stx104_reg - device register structure
- * @ssr_ad:	Software Strobe Register and ADC Data
- * @achan:	ADC Channel
- * @dio:	Digital I/O
- * @dac:	DAC Channels
- * @cir_asr:	Clear Interrupts and ADC Status
- * @acr:	ADC Control
- * @pccr_fsh:	Pacer Clock Control and FIFO Status MSB
- * @acfg:	ADC Configuration
- */
-struct stx104_reg {
-	u16 ssr_ad;
-	u8 achan;
-	u8 dio;
-	u16 dac[2];
-	u8 cir_asr;
-	u8 acr;
-	u8 pccr_fsh;
-	u8 acfg;
-};
+#define STX104_AIO_BASE 0x0
+#define STX104_SOFTWARE_STROBE STX104_AIO_BASE
+#define STX104_ADC_DATA STX104_AIO_BASE
+#define STX104_ADC_CHANNEL (STX104_AIO_BASE + 0x2)
+#define STX104_DIO_REG (STX104_AIO_BASE + 0x3)
+#define STX104_DAC_BASE (STX104_AIO_BASE + 0x4)
+#define STX104_ADC_STATUS (STX104_AIO_BASE + 0x8)
+#define STX104_ADC_CONTROL (STX104_AIO_BASE + 0x9)
+#define STX104_ADC_CONFIGURATION (STX104_AIO_BASE + 0x11)
+
+#define STX104_AIO_DATA_STRIDE 2
+#define STX104_DAC_OFFSET(_channel) (STX104_DAC_BASE + STX104_AIO_DATA_STRIDE * (_channel))
+
+/* ADC Channel */
+#define STX104_FC GENMASK(3, 0)
+#define STX104_LC GENMASK(7, 4)
+#define STX104_SINGLE_CHANNEL(_channel) \
+	(u8_encode_bits(_channel, STX104_FC) | u8_encode_bits(_channel, STX104_LC))
+
+/* ADC Status */
+#define STX104_SD BIT(5)
+#define STX104_CNV BIT(7)
+#define STX104_DIFFERENTIAL 1
+
+/* ADC Control */
+#define STX104_ALSS GENMASK(1, 0)
+#define STX104_SOFTWARE_TRIGGER u8_encode_bits(0x0, STX104_ALSS)
+
+/* ADC Configuration */
+#define STX104_GAIN GENMASK(1, 0)
+#define STX104_ADBU BIT(2)
+#define STX104_BIPOLAR 0
+#define STX104_GAIN_X1 0
+#define STX104_GAIN_X2 1
+#define STX104_GAIN_X4 2
+#define STX104_GAIN_X8 3
 
 /**
  * struct stx104_iio - IIO device private data structure
- * @chan_out_states:	channels' output states
- * @reg:		I/O address offset for the device registers
+ * @lock: synchronization lock to prevent I/O race conditions
+ * @aio_data_map: Regmap for analog I/O data
+ * @aio_ctl_map: Regmap for analog I/O control
  */
 struct stx104_iio {
-	unsigned int chan_out_states[STX104_NUM_OUT_CHAN];
-	struct stx104_reg __iomem *reg;
+	struct mutex lock;
+	struct regmap *aio_data_map;
+	struct regmap *aio_ctl_map;
 };
 
-/**
- * struct stx104_gpio - GPIO device private data structure
- * @chip:	instance of the gpio_chip
- * @lock:	synchronization lock to prevent I/O race conditions
- * @base:	base port address of the GPIO device
- * @out_state:	output bits state
- */
-struct stx104_gpio {
-	struct gpio_chip chip;
-	spinlock_t lock;
-	u8 __iomem *base;
-	unsigned int out_state;
+static const struct regmap_range aio_ctl_wr_ranges[] = {
+	regmap_reg_range(0x0, 0x0), regmap_reg_range(0x2, 0x2), regmap_reg_range(0x9, 0x9),
+	regmap_reg_range(0x11, 0x11),
+};
+static const struct regmap_range aio_ctl_rd_ranges[] = {
+	regmap_reg_range(0x2, 0x2), regmap_reg_range(0x8, 0x9), regmap_reg_range(0x11, 0x11),
+};
+static const struct regmap_range aio_ctl_volatile_ranges[] = {
+	regmap_reg_range(0x8, 0x8),
+};
+static const struct regmap_access_table aio_ctl_wr_table = {
+	.yes_ranges = aio_ctl_wr_ranges,
+	.n_yes_ranges = ARRAY_SIZE(aio_ctl_wr_ranges),
+};
+static const struct regmap_access_table aio_ctl_rd_table = {
+	.yes_ranges = aio_ctl_rd_ranges,
+	.n_yes_ranges = ARRAY_SIZE(aio_ctl_rd_ranges),
+};
+static const struct regmap_access_table aio_ctl_volatile_table = {
+	.yes_ranges = aio_ctl_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(aio_ctl_volatile_ranges),
+};
+
+static const struct regmap_config aio_ctl_regmap_config = {
+	.name = "aio_ctl",
+	.reg_bits = 8,
+	.reg_stride = 1,
+	.reg_base = STX104_AIO_BASE,
+	.val_bits = 8,
+	.io_port = true,
+	.wr_table = &aio_ctl_wr_table,
+	.rd_table = &aio_ctl_rd_table,
+	.volatile_table = &aio_ctl_volatile_table,
+	.cache_type = REGCACHE_FLAT,
+};
+
+static const struct regmap_range aio_data_wr_ranges[] = {
+	regmap_reg_range(0x4, 0x6),
+};
+static const struct regmap_range aio_data_rd_ranges[] = {
+	regmap_reg_range(0x0, 0x0),
+};
+static const struct regmap_access_table aio_data_wr_table = {
+	.yes_ranges = aio_data_wr_ranges,
+	.n_yes_ranges = ARRAY_SIZE(aio_data_wr_ranges),
+};
+static const struct regmap_access_table aio_data_rd_table = {
+	.yes_ranges = aio_data_rd_ranges,
+	.n_yes_ranges = ARRAY_SIZE(aio_data_rd_ranges),
+};
+
+static const struct regmap_config aio_data_regmap_config = {
+	.name = "aio_data",
+	.reg_bits = 16,
+	.reg_stride = STX104_AIO_DATA_STRIDE,
+	.reg_base = STX104_AIO_BASE,
+	.val_bits = 16,
+	.io_port = true,
+	.wr_table = &aio_data_wr_table,
+	.rd_table = &aio_data_rd_table,
+	.volatile_table = &aio_data_rd_table,
+	.cache_type = REGCACHE_FLAT,
+};
+
+static const struct regmap_config dio_regmap_config = {
+	.name = "dio",
+	.reg_bits = 8,
+	.reg_stride = 1,
+	.reg_base = STX104_DIO_REG,
+	.val_bits = 8,
+	.io_port = true,
 };
 
 static int stx104_read_raw(struct iio_dev *indio_dev,
 	struct iio_chan_spec const *chan, int *val, int *val2, long mask)
 {
 	struct stx104_iio *const priv = iio_priv(indio_dev);
-	struct stx104_reg __iomem *const reg = priv->reg;
+	int err;
 	unsigned int adc_config;
-	int adbu;
-	int gain;
+	unsigned int value;
+	unsigned int adc_status;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_HARDWAREGAIN:
-		/* get gain configuration */
-		adc_config = ioread8(&reg->acfg);
-		gain = adc_config & 0x3;
+		err = regmap_read(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, &adc_config);
+		if (err)
+			return err;
 
-		*val = 1 << gain;
+		*val = BIT(u8_get_bits(adc_config, STX104_GAIN));
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_RAW:
 		if (chan->output) {
-			*val = priv->chan_out_states[chan->channel];
+			err = regmap_read(priv->aio_data_map, STX104_DAC_OFFSET(chan->channel),
+					  &value);
+			if (err)
+				return err;
+			*val = value;
 			return IIO_VAL_INT;
 		}
 
+		mutex_lock(&priv->lock);
+
 		/* select ADC channel */
-		iowrite8(chan->channel | (chan->channel << 4), &reg->achan);
+		err = regmap_write(priv->aio_ctl_map, STX104_ADC_CHANNEL,
+				   STX104_SINGLE_CHANNEL(chan->channel));
+		if (err) {
+			mutex_unlock(&priv->lock);
+			return err;
+		}
 
-		/* trigger ADC sample capture by writing to the 8-bit
-		 * Software Strobe Register and wait for completion
+		/*
+		 * Trigger ADC sample capture by writing to the 8-bit Software Strobe Register and
+		 * wait for completion; the conversion time range is 5 microseconds to 53.68 seconds
+		 * in steps of 25 nanoseconds. The actual Analog Input Frame Timer time interval is
+		 * calculated as:
+		 * ai_time_frame_ns = ( AIFT + 1 ) * ( 25 nanoseconds ).
+		 * Where 0 <= AIFT <= 2147483648.
 		 */
-		iowrite8(0, &reg->ssr_ad);
-		while (ioread8(&reg->cir_asr) & BIT(7));
+		err = regmap_write(priv->aio_ctl_map, STX104_SOFTWARE_STROBE, 0);
+		if (err) {
+			mutex_unlock(&priv->lock);
+			return err;
+		}
+		err = regmap_read_poll_timeout(priv->aio_ctl_map, STX104_ADC_STATUS, adc_status,
+					       !u8_get_bits(adc_status, STX104_CNV), 0, 53687092);
+		if (err) {
+			mutex_unlock(&priv->lock);
+			return err;
+		}
 
-		*val = ioread16(&reg->ssr_ad);
+		err = regmap_read(priv->aio_data_map, STX104_ADC_DATA, &value);
+		if (err) {
+			mutex_unlock(&priv->lock);
+			return err;
+		}
+		*val = value;
+
+		mutex_unlock(&priv->lock);
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_OFFSET:
 		/* get ADC bipolar/unipolar configuration */
-		adc_config = ioread8(&reg->acfg);
-		adbu = !(adc_config & BIT(2));
+		err = regmap_read(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, &adc_config);
+		if (err)
+			return err;
 
-		*val = -32768 * adbu;
+		*val = (u8_get_bits(adc_config, STX104_ADBU) == STX104_BIPOLAR) ? -32768 : 0;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		/* get ADC bipolar/unipolar and gain configuration */
-		adc_config = ioread8(&reg->acfg);
-		adbu = !(adc_config & BIT(2));
-		gain = adc_config & 0x3;
+		err = regmap_read(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, &adc_config);
+		if (err)
+			return err;
 
 		*val = 5;
-		*val2 = 15 - adbu + gain;
+		*val2 = (u8_get_bits(adc_config, STX104_ADBU) == STX104_BIPOLAR) ? 14 : 15;
+		*val2 += u8_get_bits(adc_config, STX104_GAIN);
 		return IIO_VAL_FRACTIONAL_LOG2;
 	}
 
···
 	struct iio_chan_spec const *chan, int val, int val2, long mask)
 {
 	struct stx104_iio *const priv = iio_priv(indio_dev);
+	u8 gain;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_HARDWAREGAIN:
 		/* Only four gain states (x1, x2, x4, x8) */
 		switch (val) {
 		case 1:
-			iowrite8(0, &priv->reg->acfg);
+			gain = STX104_GAIN_X1;
 			break;
 		case 2:
-			iowrite8(1, &priv->reg->acfg);
+			gain = STX104_GAIN_X2;
 			break;
 		case 4:
-			iowrite8(2, &priv->reg->acfg);
+			gain = STX104_GAIN_X4;
 			break;
 		case 8:
-			iowrite8(3, &priv->reg->acfg);
+			gain = STX104_GAIN_X8;
 			break;
 		default:
 			return -EINVAL;
 		}
 
-		return 0;
+		return regmap_write(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, gain);
 	case IIO_CHAN_INFO_RAW:
-		if (chan->output) {
-			/* DAC can only accept up to a 16-bit value */
-			if ((unsigned int)val > 65535)
-				return -EINVAL;
+		if (!chan->output)
+			return -EINVAL;
 
-			priv->chan_out_states[chan->channel] = val;
-			iowrite16(val, &priv->reg->dac[chan->channel]);
+		if (val < 0 || val > U16_MAX)
+			return -EINVAL;
 
-			return 0;
-		}
-		return -EINVAL;
+		return regmap_write(priv->aio_data_map, STX104_DAC_OFFSET(chan->channel), val);
 	}
 
 	return -EINVAL;
···
 	STX104_IN_CHAN(6, 1), STX104_IN_CHAN(7, 1)
 };
 
-static int stx104_gpio_get_direction(struct gpio_chip *chip,
-	unsigned int offset)
+static int stx104_reg_mask_xlate(struct gpio_regmap *const gpio, const unsigned int base,
+				 unsigned int offset, unsigned int *const reg,
+				 unsigned int *const mask)
 {
-	/* GPIO 0-3 are input only, while the rest are output only */
-	if (offset < 4)
-		return 1;
-
-	return 0;
-}
-
-static int stx104_gpio_direction_input(struct gpio_chip *chip,
-	unsigned int offset)
-{
+	/* Output lines are located at same register bit offsets as input lines */
 	if (offset >= 4)
-		return -EINVAL;
+		offset -= 4;
+
+	*reg = base;
+	*mask = BIT(offset);
 
 	return 0;
-}
-
-static int stx104_gpio_direction_output(struct gpio_chip *chip,
-	unsigned int offset, int value)
-{
-	if (offset < 4)
-		return -EINVAL;
-
-	chip->set(chip, offset, value);
-	return 0;
-}
-
-static int stx104_gpio_get(struct gpio_chip *chip, unsigned int offset)
-{
-	struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
-
-	if (offset >= 4)
-		return -EINVAL;
-
-	return !!(ioread8(stx104gpio->base) & BIT(offset));
-}
-
-static int stx104_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
-	unsigned long *bits)
-{
-	struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
-
-	*bits = ioread8(stx104gpio->base);
-
-	return 0;
-}
-
-static void stx104_gpio_set(struct gpio_chip *chip, unsigned int offset,
-	int value)
-{
-	struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
-	const unsigned int mask = BIT(offset) >> 4;
-	unsigned long flags;
-
-	if (offset < 4)
-		return;
-
-	spin_lock_irqsave(&stx104gpio->lock, flags);
-
-	if (value)
-		stx104gpio->out_state |= mask;
-	else
-		stx104gpio->out_state &= ~mask;
-
-	iowrite8(stx104gpio->out_state, stx104gpio->base);
-
-	spin_unlock_irqrestore(&stx104gpio->lock, flags);
 }
 
 #define STX104_NGPIO 8
···
 	"DIN0", "DIN1", "DIN2", "DIN3", "DOUT0", "DOUT1", "DOUT2", "DOUT3"
 };
 
-static void stx104_gpio_set_multiple(struct gpio_chip *chip,
-	unsigned long *mask, unsigned long *bits)
+static int stx104_init_hw(struct stx104_iio *const priv)
 {
-	struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
-	unsigned long flags;
+	int err;
 
-	/* verify masked GPIO are output */
-	if (!(*mask & 0xF0))
-		return;
+	/* configure device for software trigger operation */
+	err = regmap_write(priv->aio_ctl_map, STX104_ADC_CONTROL, STX104_SOFTWARE_TRIGGER);
+	if (err)
+		return err;
 
-	*mask >>= 4;
-	*bits >>= 4;
+	/* initialize gain setting to x1 */
+	err = regmap_write(priv->aio_ctl_map, STX104_ADC_CONFIGURATION, STX104_GAIN_X1);
+	if (err)
+		return err;
 
-	spin_lock_irqsave(&stx104gpio->lock, flags);
+	/* initialize DAC outputs to 0V */
+	err = regmap_write(priv->aio_data_map, STX104_DAC_BASE, 0);
+	if (err)
+		return err;
+	err = regmap_write(priv->aio_data_map, STX104_DAC_BASE + STX104_AIO_DATA_STRIDE, 0);
+	if (err)
+		return err;
 
-	stx104gpio->out_state &= ~*mask;
-	stx104gpio->out_state |= *mask & *bits;
-	iowrite8(stx104gpio->out_state, stx104gpio->base);
-
-	spin_unlock_irqrestore(&stx104gpio->lock, flags);
+	return 0;
 }
 
 static int stx104_probe(struct device *dev, unsigned int id)
 {
 	struct iio_dev *indio_dev;
 	struct stx104_iio *priv;
-	struct stx104_gpio *stx104gpio;
+	struct gpio_regmap_config gpio_config;
+	void __iomem *stx104_base;
+	struct regmap *aio_ctl_map;
+	struct regmap *aio_data_map;
+	struct regmap *dio_map;
 	int err;
+	unsigned int adc_status;
 
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
 	if (!indio_dev)
-		return -ENOMEM;
-
-	stx104gpio = devm_kzalloc(dev, sizeof(*stx104gpio), GFP_KERNEL);
-	if (!stx104gpio)
 		return -ENOMEM;
 
 	if (!devm_request_region(dev, base[id], STX104_EXTENT,
···
 		return -EBUSY;
 	}
 
-	priv = iio_priv(indio_dev);
-	priv->reg = devm_ioport_map(dev, base[id], STX104_EXTENT);
-	if (!priv->reg)
+	stx104_base = devm_ioport_map(dev, base[id], STX104_EXTENT);
+	if (!stx104_base)
 		return -ENOMEM;
+
+	aio_ctl_map = devm_regmap_init_mmio(dev, stx104_base, &aio_ctl_regmap_config);
+	if (IS_ERR(aio_ctl_map))
+		return dev_err_probe(dev, PTR_ERR(aio_ctl_map),
+				     "Unable to initialize aio_ctl register map\n");
+
+	aio_data_map = devm_regmap_init_mmio(dev, stx104_base, &aio_data_regmap_config);
+	if (IS_ERR(aio_data_map))
+		return dev_err_probe(dev, PTR_ERR(aio_data_map),
+				     "Unable to initialize aio_data register map\n");
+
+	dio_map = devm_regmap_init_mmio(dev, stx104_base, &dio_regmap_config);
+	if (IS_ERR(dio_map))
+		return dev_err_probe(dev, PTR_ERR(dio_map),
+				     "Unable to initialize dio register map\n");
+
+	priv = iio_priv(indio_dev);
+	priv->aio_ctl_map = aio_ctl_map;
+	priv->aio_data_map = aio_data_map;
 
 	indio_dev->info = &stx104_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
-	/* determine if differential inputs */
-	if (ioread8(&priv->reg->cir_asr) & BIT(5)) {
+	err = regmap_read(aio_ctl_map, STX104_ADC_STATUS, &adc_status);
+	if (err)
+		return err;
+
+	if (u8_get_bits(adc_status, STX104_SD) == STX104_DIFFERENTIAL) {
 		indio_dev->num_channels = ARRAY_SIZE(stx104_channels_diff);
 		indio_dev->channels = stx104_channels_diff;
 	} else {
···
 
 	indio_dev->name = dev_name(dev);
 
-	/* configure device for software trigger operation */
-	iowrite8(0, &priv->reg->acr);
+	mutex_init(&priv->lock);
 
-	/* initialize gain setting to x1 */
-	iowrite8(0, &priv->reg->acfg);
-
-	/* initialize DAC output to 0V */
-	iowrite16(0, &priv->reg->dac[0]);
-	iowrite16(0, &priv->reg->dac[1]);
-
-	stx104gpio->chip.label = dev_name(dev);
-	stx104gpio->chip.parent = dev;
-	stx104gpio->chip.owner = THIS_MODULE;
-	stx104gpio->chip.base = -1;
-	stx104gpio->chip.ngpio = STX104_NGPIO;
-	stx104gpio->chip.names = stx104_names;
-	stx104gpio->chip.get_direction = stx104_gpio_get_direction;
-	stx104gpio->chip.direction_input = stx104_gpio_direction_input;
-	stx104gpio->chip.direction_output = stx104_gpio_direction_output;
-	stx104gpio->chip.get = stx104_gpio_get;
-	stx104gpio->chip.get_multiple = stx104_gpio_get_multiple;
-	stx104gpio->chip.set = stx104_gpio_set;
-	stx104gpio->chip.set_multiple = stx104_gpio_set_multiple;
-	stx104gpio->base = &priv->reg->dio;
-	stx104gpio->out_state = 0x0;
-
-	spin_lock_init(&stx104gpio->lock);
-
-	err = devm_gpiochip_add_data(dev, &stx104gpio->chip, stx104gpio);
-	if (err) {
-		dev_err(dev, "GPIO registering failed (%d)\n", err);
+	err = stx104_init_hw(priv);
+	if (err)
 		return err;
-	}
 
-	return devm_iio_device_register(dev, indio_dev);
+	err = devm_iio_device_register(dev, indio_dev);
+	if (err)
+		return err;
+
+	gpio_config = (struct gpio_regmap_config) {
+		.parent = dev,
+		.regmap = dio_map,
+		.ngpio = STX104_NGPIO,
+		.names = stx104_names,
+		.reg_dat_base = GPIO_REGMAP_ADDR(STX104_DIO_REG),
+		.reg_set_base = GPIO_REGMAP_ADDR(STX104_DIO_REG),
+		.ngpio_per_reg = STX104_NGPIO,
+		.reg_mask_xlate = stx104_reg_mask_xlate,
+		.drvdata = dio_map,
+	};
+
+	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &gpio_config));
 }
 
 static struct isa_driver stx104_driver = {

drivers/iio/chemical/sps30_i2c.c

···
 	/*
 	 * Internally sensor stores measurements in a following manner:
 	 *
-	 * PM1: upper two bytes, crc8, lower two bytes, crc8
+	 * PM1:   upper two bytes, crc8, lower two bytes, crc8
 	 * PM2P5: upper two bytes, crc8, lower two bytes, crc8
-	 * PM4: upper two bytes, crc8, lower two bytes, crc8
-	 * PM10: upper two bytes, crc8, lower two bytes, crc8
+	 * PM4:   upper two bytes, crc8, lower two bytes, crc8
+	 * PM10:  upper two bytes, crc8, lower two bytes, crc8
 	 *
 	 * What follows next are number concentration measurements and
 	 * typical particle size measurement which we omit.

drivers/iio/common/st_sensors/st_sensors_trigger.c

···
 	 */
 	if (sdata->hw_irq_trigger &&
 	    st_sensors_new_samples_available(indio_dev, sdata)) {
-		iio_trigger_poll_chained(p);
+		iio_trigger_poll_nested(p);
 	} else {
 		dev_dbg(indio_dev->dev.parent, "spurious IRQ\n");
 		return IRQ_NONE;
···
 		dev_dbg(indio_dev->dev.parent,
 			"more samples came in during polling\n");
 		sdata->hw_timestamp = iio_get_time_ns(indio_dev);
-		iio_trigger_poll_chained(p);
+		iio_trigger_poll_nested(p);
 	}
 
 	return IRQ_HANDLED;

drivers/iio/dac/Kconfig

···
 	tristate "Measurement Computing CIO-DAC IIO driver"
 	depends on X86 && (ISA_BUS || PC104)
 	select ISA_BUS_API
+	select REGMAP_MMIO
 	help
 	  Say yes here to build support for the Measurement Computing CIO-DAC
 	  analog output device family (CIO-DAC16, CIO-DAC08, PC104-DAC06). The

drivers/iio/dac/ad5592r-base.c

···
 	return 0;
 }
 
+static const char * const ad5592r_gpio_names[] = {
+	"GPIO0", "GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5", "GPIO6", "GPIO7",
+};
+
 static int ad5592r_gpio_init(struct ad5592r_state *st)
 {
 	if (!st->gpio_map)
···
 	st->gpiochip.set = ad5592r_gpio_set;
 	st->gpiochip.request = ad5592r_gpio_request;
 	st->gpiochip.owner = THIS_MODULE;
+	st->gpiochip.names = ad5592r_gpio_names;
 
 	mutex_init(&st->gpio_lock);
 

drivers/iio/dac/cio-dac.c

···
  * Copyright (C) 2016 William Breathitt Gray
  *
  * This driver supports the following Measurement Computing devices: CIO-DAC16,
- * CIO-DAC06, and PC104-DAC06.
+ * CIO-DAC08, and PC104-DAC06.
  */
-#include <linux/bitops.h>
+#include <linux/bits.h>
 #include <linux/device.h>
-#include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/types.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
 #include <linux/isa.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
+#include <linux/regmap.h>
 #include <linux/types.h>
 
 #define CIO_DAC_NUM_CHAN 16
···
 module_param_hw_array(base, uint, ioport, &num_cio_dac, 0);
 MODULE_PARM_DESC(base, "Measurement Computing CIO-DAC base addresses");
 
+#define CIO_DAC_BASE 0x00
+#define CIO_DAC_CHANNEL_STRIDE 2
+
+static bool cio_dac_precious_reg(struct device *dev, unsigned int reg)
+{
+	/*
+	 * All registers are considered precious; if the XFER jumper is set on
+	 * the device, then no update occurs until a DAC register is read.
+	 */
+	return true;
+}
+
+static const struct regmap_config cio_dac_regmap_config = {
+	.reg_bits = 16,
+	.reg_stride = 2,
+	.val_bits = 16,
+	.io_port = true,
+	.max_register = 0x1F,
+	.precious_reg = cio_dac_precious_reg,
+};
+
 /**
  * struct cio_dac_iio - IIO device private data structure
- * @chan_out_states:	channels' output states
- * @base:		base memory address of the DAC device
+ * @map: Regmap for the device
  */
 struct cio_dac_iio {
-	int chan_out_states[CIO_DAC_NUM_CHAN];
-	u16 __iomem *base;
+	struct regmap *map;
 };
 
 static int cio_dac_read_raw(struct iio_dev *indio_dev,
 	struct iio_chan_spec const *chan, int *val, int *val2, long mask)
 {
 	struct cio_dac_iio *const priv = iio_priv(indio_dev);
+	const unsigned int offset = chan->channel * CIO_DAC_CHANNEL_STRIDE;
+	int err;
+	unsigned int dac_val;
 
 	if (mask != IIO_CHAN_INFO_RAW)
 		return -EINVAL;
 
-	*val = priv->chan_out_states[chan->channel];
+	err = regmap_read(priv->map, CIO_DAC_BASE + offset, &dac_val);
+	if (err)
+		return err;
+
+	*val = dac_val;
 
 	return IIO_VAL_INT;
 }
···
 	struct iio_chan_spec const *chan, int val, int val2, long mask)
 {
 	struct cio_dac_iio *const priv = iio_priv(indio_dev);
+	const unsigned int offset = chan->channel * CIO_DAC_CHANNEL_STRIDE;
 
 	if (mask != IIO_CHAN_INFO_RAW)
 		return -EINVAL;
···
 	if ((unsigned int)val > 4095)
 		return -EINVAL;
 
-	priv->chan_out_states[chan->channel] = val;
-	iowrite16(val, priv->base + chan->channel);
-
-	return 0;
+	return regmap_write(priv->map, CIO_DAC_BASE + offset, val);
 }
 
 static const struct iio_info cio_dac_info = {
···
 {
 	struct iio_dev *indio_dev;
 	struct cio_dac_iio *priv;
-	unsigned int i;
+	void __iomem *regs;
 
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
 	if (!indio_dev)
···
 		return -EBUSY;
 	}
 
-	priv = iio_priv(indio_dev);
-	priv->base = devm_ioport_map(dev, base[id], CIO_DAC_EXTENT);
-	if (!priv->base)
+	regs = devm_ioport_map(dev, base[id], CIO_DAC_EXTENT);
+	if (!regs)
 		return -ENOMEM;
+
+	priv = iio_priv(indio_dev);
+	priv->map = devm_regmap_init_mmio(dev, regs, &cio_dac_regmap_config);
+	if (IS_ERR(priv->map))
+		return dev_err_probe(dev, PTR_ERR(priv->map),
+				     "Unable to initialize register map\n");
 
 	indio_dev->info = &cio_dac_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = cio_dac_channels;
 	indio_dev->num_channels = CIO_DAC_NUM_CHAN;
 	indio_dev->name = dev_name(dev);
-
-	/* initialize DAC outputs to 0V */
-	for (i = 0; i < CIO_DAC_NUM_CHAN; i++)
-		iowrite16(0, priv->base + i);
 
 	return devm_iio_device_register(dev, indio_dev);
 }

drivers/iio/dac/max5522.c

···
 	} \
 }
 
-const struct iio_chan_spec max5522_channels[] = {
+static const struct iio_chan_spec max5522_channels[] = {
 	MAX5522_CHANNEL(0),
 	MAX5522_CHANNEL(1),
 };

drivers/iio/frequency/admv1013.c

···
 					  st->input_mode);
 }
 
-static void admv1013_clk_disable(void *data)
-{
-	clk_disable_unprepare(data);
-}
-
 static void admv1013_reg_disable(void *data)
 {
 	regulator_disable(data);
···
 		return dev_err_probe(&spi->dev, PTR_ERR(st->reg),
 				     "failed to get the common-mode voltage\n");
 
-	st->clkin = devm_clk_get(&spi->dev, "lo_in");
-	if (IS_ERR(st->clkin))
-		return dev_err_probe(&spi->dev, PTR_ERR(st->clkin),
-				     "failed to get the LO input clock\n");
-
 	return 0;
 }
 
···
 	if (ret)
 		return ret;
 
-	ret = clk_prepare_enable(st->clkin);
-	if (ret)
-		return ret;
-
-	ret = devm_add_action_or_reset(&spi->dev, admv1013_clk_disable, st->clkin);
-	if (ret)
-		return ret;
+	st->clkin = devm_clk_get_enabled(&spi->dev, "lo_in");
+	if (IS_ERR(st->clkin))
+		return dev_err_probe(&spi->dev, PTR_ERR(st->clkin),
+				     "failed to get the LO input clock\n");
 
 	st->nb.notifier_call = admv1013_freq_change;
 	ret = devm_clk_notifier_register(&spi->dev, st->clkin, &st->nb);

drivers/iio/gyro/fxas21002c_core.c

···
 	if (!data_ready)
 		return IRQ_NONE;
 
-	iio_trigger_poll_chained(data->dready_trig);
+	iio_trigger_poll_nested(data->dready_trig);
 
 	return IRQ_HANDLED;
 }

drivers/iio/gyro/mpu3050-core.c

···
 	if (!(val & MPU3050_INT_STATUS_RAW_RDY))
 		return IRQ_NONE;
 
-	iio_trigger_poll_chained(p);
+	iio_trigger_poll_nested(p);
 
 	return IRQ_HANDLED;
 }

drivers/iio/humidity/hts221_buffer.c

···
 	if (!(status & HTS221_RH_DRDY_MASK))
 		return IRQ_NONE;
 
-	iio_trigger_poll_chained(hw->trig);
+	iio_trigger_poll_nested(hw->trig);
 
 	return IRQ_HANDLED;
 }

drivers/iio/imu/adis16475.c

···
 
 		/*
 		 * This is not an hard requirement but it's not advised to run the IMU
-		 * with a sample rate lower than 4000Hz due to possible undersampling
+		 * with a sample rate lower than 1900Hz due to possible undersampling
 		 * issues. However, there are users that might really want to take the risk.
 		 * Hence, we provide a module parameter for them. If set, we allow sample
-		 * rates lower than 4KHz. By default, we won't allow this and we just roundup
-		 * the rate to the next multiple of the input clock bigger than 4KHz. This
+		 * rates lower than 1.9KHz. By default, we won't allow this and we just roundup
+		 * the rate to the next multiple of the input clock bigger than 1.9KHz. This
 		 * is done like this as in some cases (when DEC_RATE is 0) might give
 		 * us the closest value to the one desired by the user...
 		 */

drivers/iio/imu/st_lsm6dsx/Kconfig

···
 	  sensor. Supported devices: lsm6ds3, lsm6ds3h, lsm6dsl, lsm6dsm,
 	  ism330dlc, lsm6dso, lsm6dsox, asm330lhh, asm330lhhx, lsm6dsr,
 	  lsm6ds3tr-c, ism330dhcx, lsm6dsrx, lsm6ds0, lsm6dsop, lsm6dstx,
-	  lsm6dsv, lsm6dsv16x, lsm6dso16is, ism330is, lsm6dst and the
-	  accelerometer/gyroscope of lsm9ds1.
+	  lsm6dsv, lsm6dsv16x, lsm6dso16is, ism330is, asm330lhb, lsm6dst
+	  and the accelerometer/gyroscope of lsm9ds1.
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called st_lsm6dsx.

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h

···
 #define ST_LSM6DSV16X_DEV_NAME	"lsm6dsv16x"
 #define ST_LSM6DSO16IS_DEV_NAME	"lsm6dso16is"
 #define ST_ISM330IS_DEV_NAME	"ism330is"
+#define ST_ASM330LHB_DEV_NAME	"asm330lhb"
 
 enum st_lsm6dsx_hw_id {
 	ST_LSM6DS3_ID,
···
 	ST_LSM6DSV16X_ID,
 	ST_LSM6DSO16IS_ID,
 	ST_ISM330IS_ID,
+	ST_ASM330LHB_ID,
 	ST_LSM6DSX_MAX_ID,
 };
 
···
 
 	struct st_lsm6dsx_odr odr_avl[ST_LSM6DSX_ODR_LIST_SIZE];
 	int odr_len;
+};
+
+struct st_lsm6dsx_samples_to_discard {
+	struct {
+		u32 milli_hz;
+		u16 samples;
+	} val[ST_LSM6DSX_ODR_LIST_SIZE];
 };
 
 struct st_lsm6dsx_fs {
···
  * @irq_config: interrupts related registers.
  * @drdy_mask: register info for data-ready mask (addr + mask).
  * @odr_table: Hw sensors odr table (Hz + val).
+ * @samples_to_discard: Number of samples to discard for filters settling time.
  * @fs_table: Hw sensors gain table (gain + val).
  * @decimator: List of decimator register info (addr + mask).
  * @batch: List of FIFO batching register info (addr + mask).
···
 	} irq_config;
 	struct st_lsm6dsx_reg drdy_mask;
 	struct st_lsm6dsx_odr_table_entry odr_table[2];
+	struct st_lsm6dsx_samples_to_discard samples_to_discard[2];
 	struct st_lsm6dsx_fs_table_entry fs_table[2];
 	struct st_lsm6dsx_reg decimator[ST_LSM6DSX_MAX_ID];
 	struct st_lsm6dsx_reg batch[ST_LSM6DSX_MAX_ID];
···
  * @hw: Pointer to instance of struct st_lsm6dsx_hw.
  * @gain: Configured sensor sensitivity.
  * @odr: Output data rate of the sensor [Hz].
+ * @samples_to_discard: Number of samples to discard for filters settling time.
  * @watermark: Sensor watermark level.
  * @decimator: Sensor decimation factor.
  * @sip: Number of samples in a given pattern.
···
 	u32 gain;
 	u32 odr;
 
+	u16 samples_to_discard;
 	u16 watermark;
 	u8 decimator;
 	u8 sip;

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c

···
  * value of the decimation factor and ODR set for each FIFO data set.
  *
  * LSM6DSO/LSM6DSOX/ASM330LHH/ASM330LHHX/LSM6DSR/LSM6DSRX/ISM330DHCX/
- * LSM6DST/LSM6DSOP/LSM6DSTX/LSM6DSV:
+ * LSM6DST/LSM6DSOP/LSM6DSTX/LSM6DSV/ASM330LHB:
  * The FIFO buffer can be configured to store data from gyroscope and
  * accelerometer. Each sample is queued with a tag (1B) indicating data
  * source (gyroscope, accelerometer, hw timer).
···
 			}
 
 			if (gyro_sip > 0 && !(sip % gyro_sensor->decimator)) {
-				iio_push_to_buffers_with_timestamp(
-					hw->iio_devs[ST_LSM6DSX_ID_GYRO],
-					&hw->scan[ST_LSM6DSX_ID_GYRO],
-					gyro_sensor->ts_ref + ts);
+				/*
+				 * We need to discards gyro samples during
+				 * filters settling time
+				 */
+				if (gyro_sensor->samples_to_discard > 0)
+					gyro_sensor->samples_to_discard--;
+				else
+					iio_push_to_buffers_with_timestamp(
+						hw->iio_devs[ST_LSM6DSX_ID_GYRO],
+						&hw->scan[ST_LSM6DSX_ID_GYRO],
+						gyro_sensor->ts_ref + ts);
 				gyro_sip--;
 			}
 			if (acc_sip > 0 && !(sip % acc_sensor->decimator)) {
-				iio_push_to_buffers_with_timestamp(
-					hw->iio_devs[ST_LSM6DSX_ID_ACC],
-					&hw->scan[ST_LSM6DSX_ID_ACC],
-					acc_sensor->ts_ref + ts);
+				/*
+				 * We need to discards accel samples during
+				 * filters settling time
+				 */
+				if (acc_sensor->samples_to_discard > 0)
+					acc_sensor->samples_to_discard--;
+				else
+					iio_push_to_buffers_with_timestamp(
+						hw->iio_devs[ST_LSM6DSX_ID_ACC],
+						&hw->scan[ST_LSM6DSX_ID_ACC],
+						acc_sensor->ts_ref + ts);
 				acc_sip--;
 			}
 			if (ext_sip > 0 && !(sip % ext_sensor->decimator)) {
···
 	return err;
 }
 
+static void
+st_lsm6dsx_update_samples_to_discard(struct st_lsm6dsx_sensor *sensor)
+{
+	const struct st_lsm6dsx_samples_to_discard *data;
+	struct st_lsm6dsx_hw *hw = sensor->hw;
+	int i;
+
+	if (sensor->id != ST_LSM6DSX_ID_GYRO &&
+	    sensor->id != ST_LSM6DSX_ID_ACC)
+		return;
+
+	/* check if drdy mask is supported in hw */
+	if (hw->settings->drdy_mask.addr)
+		return;
+
+	data = &hw->settings->samples_to_discard[sensor->id];
+	for (i = 0; i < ST_LSM6DSX_ODR_LIST_SIZE; i++) {
+		if (data->val[i].milli_hz == sensor->odr) {
+			sensor->samples_to_discard = data->val[i].samples;
+			return;
+		}
+	}
+}
+
 int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable)
 {
 	struct st_lsm6dsx_hw *hw = sensor->hw;
···
 		if (err < 0)
 			goto out;
 	}
+
+	if (enable)
+		st_lsm6dsx_update_samples_to_discard(sensor);
 
 	err = st_lsm6dsx_device_set_enable(sensor, enable);
 	if (err < 0)

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c

···
 				.fs_len = 4,
 			},
 		},
+		.samples_to_discard = {
+			[ST_LSM6DSX_ID_ACC] = {
+				.val[0] = {  12500, 1 },
+				.val[1] = {  26000, 1 },
+				.val[2] = {  52000, 1 },
+				.val[3] = { 104000, 2 },
+				.val[4] = { 208000, 2 },
+				.val[5] = { 416000, 2 },
+			},
+			[ST_LSM6DSX_ID_GYRO] = {
+				.val[0] = {  12500,  2 },
+				.val[1] = {  26000,  5 },
+				.val[2] = {  52000,  7 },
+				.val[3] = { 104000, 12 },
+				.val[4] = { 208000, 20 },
+				.val[5] = { 416000, 36 },
+			},
+		},
 		.irq_config = {
 			.irq1 = {
 				.addr = 0x0d,
···
 				.hw_id = ST_LSM6DSOP_ID,
 				.name = ST_LSM6DSOP_DEV_NAME,
 				.wai = 0x6c,
+			}, {
+				.hw_id = ST_ASM330LHB_ID,
+				.name = ST_ASM330LHB_DEV_NAME,
+				.wai = 0x6b,
 			},
 		},
 		.channels = {

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c

···
 		.compatible = "st,ism330is",
 		.data = (void *)ST_ISM330IS_ID,
 	},
+	{
+		.compatible = "st,asm330lhb",
+		.data = (void *)ST_ASM330LHB_ID,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, st_lsm6dsx_i2c_of_match);
···
 	{ ST_LSM6DSV16X_DEV_NAME, ST_LSM6DSV16X_ID },
 	{ ST_LSM6DSO16IS_DEV_NAME, ST_LSM6DSO16IS_ID },
 	{ ST_ISM330IS_DEV_NAME, ST_ISM330IS_ID },
+	{ ST_ASM330LHB_DEV_NAME, ST_ASM330LHB_ID },
 	{},
 };
 MODULE_DEVICE_TABLE(i2c, st_lsm6dsx_i2c_id_table);

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c

···
 		.compatible = "st,ism330is",
 		.data = (void *)ST_ISM330IS_ID,
 	},
+	{
+		.compatible = "st,asm330lhb",
+		.data = (void *)ST_ASM330LHB_ID,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, st_lsm6dsx_spi_of_match);
···
 	{ ST_LSM6DSV16X_DEV_NAME, ST_LSM6DSV16X_ID },
 	{ ST_LSM6DSO16IS_DEV_NAME, ST_LSM6DSO16IS_ID },
 	{ ST_ISM330IS_DEV_NAME, ST_ISM330IS_ID },
+	{ ST_ASM330LHB_DEV_NAME, ST_ASM330LHB_ID },
 	{},
 };
 MODULE_DEVICE_TABLE(spi, st_lsm6dsx_spi_id_table);

drivers/iio/industrialio-gts-helper.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/* gain-time-scale conversion helpers for IIO light sensors
+ *
+ * Copyright (c) 2023 Matti Vaittinen <[e-mail]>
+ */
+
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/minmax.h>
+#include <linux/module.h>
+#include <linux/overflow.h>
+#include <linux/slab.h>
+#include <linux/sort.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#include <linux/iio/iio-gts-helper.h>
+#include <linux/iio/types.h>
+
+/**
+ * iio_gts_get_gain - Convert scale to total gain
+ *
+ * Internal helper for converting scale to total gain.
+ *
+ * @max:	Maximum linearized scale. As an example, when scale is created
+ *		in magnitude of NANOs and max scale is 64.1 - The linearized
+ *		scale is 64 100 000 000.
+ * @scale:	Linearized scale to compute the gain for.
+ *
+ * Return:	(floored) gain corresponding to the scale. -EINVAL if scale
+ *		is invalid.
+ */
+static int iio_gts_get_gain(const u64 max, const u64 scale)
+{
+	u64 full = max;
+	int tmp = 1;
+
+	if (scale > full || !scale)
+		return -EINVAL;
+
+	if (U64_MAX - full < scale) {
+		/* Risk of overflow */
+		if (full - scale < scale)
+			return 1;
+
+		full -= scale;
+		tmp++;
+	}
+
+	while (full > scale * (u64)tmp)
+		tmp++;
+
+	return tmp;
+}
+
+/**
+ * gain_get_scale_fraction - get the gain or time based on scale and known one
+ *
+ * @max:	Maximum linearized scale. As an example, when scale is created
+ *		in magnitude of NANOs and max scale is 64.1 - The linearized
+ *		scale is 64 100 000 000.
+ * @scale:	Linearized scale to compute the gain/time for.
+ * @known:	Either integration time or gain depending on which one is known
+ * @unknown:	Pointer to variable where the computed gain/time is stored
+ *
+ * Internal helper for computing unknown fraction of total gain.
+ * Compute either gain or time based on scale and either the gain or time
+ * depending on which one is known.
+ *
+ * Return:	0 on success.
+ */
+static int gain_get_scale_fraction(const u64 max, u64 scale, int known,
+				   int *unknown)
+{
+	int tot_gain;
+
+	tot_gain = iio_gts_get_gain(max, scale);
+	if (tot_gain < 0)
+		return tot_gain;
+
+	*unknown = tot_gain / known;
+
+	/* We require total gain to be exact multiple of known * unknown */
+	if (!*unknown || *unknown * known != tot_gain)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int iio_gts_delinearize(u64 lin_scale, unsigned long scaler,
+			       int *scale_whole, int *scale_nano)
+{
+	int frac;
+
+	if (scaler > NANO)
+		return -EOVERFLOW;
+
+	if (!scaler)
+		return -EINVAL;
+
+	frac = do_div(lin_scale, scaler);
+
+	*scale_whole = lin_scale;
+	*scale_nano = frac * (NANO / scaler);
+
+	return 0;
+}
+
+static int iio_gts_linearize(int scale_whole, int scale_nano,
+			     unsigned long scaler, u64 *lin_scale)
+{
+	/*
+	 * Expect scale to be (mostly) NANO or MICRO. Divide divider instead of
+	 * multiplication followed by division to avoid overflow.
+	 */
+	if (scaler > NANO || !scaler)
+		return -EINVAL;
+
+	*lin_scale = (u64)scale_whole * (u64)scaler +
+		     (u64)(scale_nano / (NANO / scaler));
+
+	return 0;
+}
+
+/**
+ * iio_gts_total_gain_to_scale - convert gain to scale
+ * @gts:	Gain time scale descriptor
+ * @total_gain:	the gain to be converted
+ * @scale_int:	Pointer to integral part of the scale (typically val1)
+ * @scale_nano:	Pointer to fractional part of the scale (nano or ppb)
+ *
+ * Convert the total gain value to scale. NOTE: This does not separate gain
+ * generated by HW-gain or integration time. It is up to caller to decide what
+ * part of the total gain is due to integration time and what due to HW-gain.
+ *
+ * Return: 0 on success. Negative errno on failure.
+ */
+int iio_gts_total_gain_to_scale(struct iio_gts *gts, int total_gain,
+				int *scale_int, int *scale_nano)
+{
+	u64 tmp;
+
+	tmp = gts->max_scale;
+
+	do_div(tmp, total_gain);
+
+	return iio_gts_delinearize(tmp, NANO, scale_int, scale_nano);
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_total_gain_to_scale, IIO_GTS_HELPER);
+
+/**
+ * iio_gts_purge_avail_scale_table - free-up the available scale tables
+ * @gts:	Gain time scale descriptor
+ *
+ * Free the space reserved by iio_gts_build_avail_scale_table().
+ */
+static void iio_gts_purge_avail_scale_table(struct iio_gts *gts)
+{
+	int i;
+
+	if (gts->per_time_avail_scale_tables) {
+		for (i = 0; i < gts->num_itime; i++)
+			kfree(gts->per_time_avail_scale_tables[i]);
+
+		kfree(gts->per_time_avail_scale_tables);
+		gts->per_time_avail_scale_tables = NULL;
+	}
+
+	kfree(gts->avail_all_scales_table);
+	gts->avail_all_scales_table = NULL;
+
+	gts->num_avail_all_scales = 0;
+}
+
+static int iio_gts_gain_cmp(const void *a, const void *b)
+{
+	return *(int *)a - *(int *)b;
+}
+
+static int gain_to_scaletables(struct iio_gts *gts, int **gains, int **scales)
+{
+	int ret, i, j, new_idx, time_idx;
+	int *all_gains;
+	size_t gain_bytes;
+
+	for (i = 0; i < gts->num_itime; i++) {
+		/*
+		 * Sort the tables for nice output and for easier finding of
+		 * unique values.
+		 */
+		sort(gains[i], gts->num_hwgain, sizeof(int), iio_gts_gain_cmp,
+		     NULL);
+
+		/* Convert gains to scales */
+		for (j = 0; j < gts->num_hwgain; j++) {
+			ret = iio_gts_total_gain_to_scale(gts, gains[i][j],
+							  &scales[i][2 * j],
+							  &scales[i][2 * j + 1]);
+			if (ret)
+				return ret;
+		}
+	}
+
+	gain_bytes = array_size(gts->num_hwgain, sizeof(int));
+	all_gains = kcalloc(gts->num_itime, gain_bytes, GFP_KERNEL);
+	if (!all_gains)
+		return -ENOMEM;
+
+	/*
+	 * We assume all the gains for same integration time were unique.
+	 * It is likely the first time table had greatest time multiplier as
+	 * the times are in the order of preference and greater times are
+	 * usually preferred. Hence we start from the last table which is likely
+	 * to have the smallest total gains.
+	 */
+	time_idx = gts->num_itime - 1;
+	memcpy(all_gains, gains[time_idx], gain_bytes);
+	new_idx = gts->num_hwgain;
+
+	while (time_idx--) {
+		for (j = 0; j < gts->num_hwgain; j++) {
+			int candidate = gains[time_idx][j];
+			int chk;
+
+			if (candidate > all_gains[new_idx - 1]) {
+				all_gains[new_idx] = candidate;
+				new_idx++;
+
+				continue;
+			}
+			for (chk = 0; chk < new_idx; chk++)
+				if (candidate <= all_gains[chk])
+					break;
+
+			if (candidate == all_gains[chk])
+				continue;
+
+			memmove(&all_gains[chk + 1], &all_gains[chk],
+				(new_idx - chk) * sizeof(int));
+			all_gains[chk] = candidate;
+			new_idx++;
+		}
+	}
+
+	gts->avail_all_scales_table = kcalloc(new_idx, 2 * sizeof(int),
+					      GFP_KERNEL);
+	if (!gts->avail_all_scales_table) {
+		ret = -ENOMEM;
+		goto free_out;
+	}
+	gts->num_avail_all_scales = new_idx;
+
+	for (i = 0; i < gts->num_avail_all_scales; i++) {
+		ret = iio_gts_total_gain_to_scale(gts, all_gains[i],
+					&gts->avail_all_scales_table[i * 2],
+					&gts->avail_all_scales_table[i * 2 + 1]);
+
+		if (ret) {
+			kfree(gts->avail_all_scales_table);
+			gts->num_avail_all_scales = 0;
+			goto free_out;
+		}
+	}
+
+free_out:
+	kfree(all_gains);
+
+	return ret;
+}
+
+/**
+ * iio_gts_build_avail_scale_table - create tables of available scales
+ * @gts:	Gain time scale descriptor
+ *
+ * Build the tables which can represent the available scales based on the
+ * originally given gain and time tables. When both time and gain tables are
+ * given this results:
+ * 1. A set of tables representing available scales for each supported
+ *    integration time.
+ * 2. A single table listing all the unique scales that any combination of
+ *    supported gains and times can provide.
+ *
+ * NOTE: Space allocated for the tables must be freed using
+ * iio_gts_purge_avail_scale_table() when the tables are no longer needed.
+ *
+ * Return: 0 on success.
+ */
+static int iio_gts_build_avail_scale_table(struct iio_gts *gts)
+{
+	int **per_time_gains, **per_time_scales, i, j, ret = -ENOMEM;
+
+	per_time_gains = kcalloc(gts->num_itime, sizeof(*per_time_gains), GFP_KERNEL);
+	if (!per_time_gains)
+		return ret;
+
+	per_time_scales = kcalloc(gts->num_itime, sizeof(*per_time_scales), GFP_KERNEL);
+	if (!per_time_scales)
+		goto free_gains;
+
+	for (i = 0; i < gts->num_itime; i++) {
+		per_time_scales[i] = kcalloc(gts->num_hwgain, 2 * sizeof(int),
+					     GFP_KERNEL);
+		if (!per_time_scales[i])
+			goto err_free_out;
+
+		per_time_gains[i] = kcalloc(gts->num_hwgain, sizeof(int),
+					    GFP_KERNEL);
+		if (!per_time_gains[i]) {
+			kfree(per_time_scales[i]);
+			goto err_free_out;
+		}
+
+		for (j = 0; j < gts->num_hwgain; j++)
+			per_time_gains[i][j] = gts->hwgain_table[j].gain *
+					       gts->itime_table[i].mul;
+	}
+
+	ret = gain_to_scaletables(gts, per_time_gains, per_time_scales);
+	if (ret)
+		goto err_free_out;
+
+	kfree(per_time_gains);
+	gts->per_time_avail_scale_tables = per_time_scales;
+
+	return 0;
+
+err_free_out:
+	for (i--; i; i--) {
+		kfree(per_time_scales[i]);
+		kfree(per_time_gains[i]);
+	}
+	kfree(per_time_scales);
+free_gains:
+	kfree(per_time_gains);
+
+	return ret;
+}
+
+/**
+ * iio_gts_build_avail_time_table - build table of available integration times
+ * @gts:	Gain time scale descriptor
+ *
+ * Build the table which can represent the available times to be returned
+ * to users using the read_avail-callback.
+ *
+ * NOTE: Space allocated for the tables must be freed using
+ * iio_gts_purge_avail_time_table() when the tables are no longer needed.
+ *
+ * Return: 0 on success.
+ */
+static int iio_gts_build_avail_time_table(struct iio_gts *gts)
+{
+	int *times, i, j, idx = 0;
+
+	if (!gts->num_itime)
+		return 0;
+
+	times = kcalloc(gts->num_itime, sizeof(int), GFP_KERNEL);
+	if (!times)
+		return -ENOMEM;
+
+	/* Sort times from all tables to one and remove duplicates */
+	for (i = gts->num_itime - 1; i >= 0; i--) {
+		int new = gts->itime_table[i].time_us;
+
+		if (times[idx] < new) {
+			times[idx++] = new;
+			continue;
+		}
+
+		for (j = 0; j <= idx; j++) {
+			if (times[j] > new) {
+				memmove(&times[j + 1], &times[j],
+					(idx - j) * sizeof(int));
+				times[j] = new;
+				idx++;
+			}
+		}
+	}
+	gts->avail_time_tables = times;
+	/*
+	 * This is just to survive a unlikely corner-case where times in the
+	 * given time table were not unique. Else we could just trust the
+	 * gts->num_itime.
+	 */
+	gts->num_avail_time_tables = idx;
+
+	return 0;
+}
+
+/**
+ * iio_gts_purge_avail_time_table - free-up the available integration time table
+ * @gts:	Gain time scale descriptor
+ *
+ * Free the space reserved by iio_gts_build_avail_time_table().
+ */
+static void iio_gts_purge_avail_time_table(struct iio_gts *gts)
+{
+	if (gts->num_avail_time_tables) {
+		kfree(gts->avail_time_tables);
+		gts->avail_time_tables = NULL;
+		gts->num_avail_time_tables = 0;
+	}
+}
+
+/**
+ * iio_gts_build_avail_tables - create tables of available scales and int times
+ * @gts:	Gain time scale descriptor
+ *
+ * Build the tables which can represent the available scales and available
+ * integration times. Availability tables are built based on the originally
+ * given gain and given time tables.
+ *
+ * When both time and gain tables are
+ * given this results:
+ * 1. A set of sorted tables representing available scales for each supported
+ *    integration time.
+ * 2. A single sorted table listing all the unique scales that any combination
+ *    of supported gains and times can provide.
+ * 3. A sorted table of supported integration times
+ *
+ * After these tables are built one can use the iio_gts_all_avail_scales(),
+ * iio_gts_avail_scales_for_time() and iio_gts_avail_times() helpers to
+ * implement the read_avail operations.
+ *
+ * NOTE: Space allocated for the tables must be freed using
+ * iio_gts_purge_avail_tables() when the tables are no longer needed.
+ *
+ * Return: 0 on success.
+ */
+static int iio_gts_build_avail_tables(struct iio_gts *gts)
+{
+	int ret;
+
+	ret = iio_gts_build_avail_scale_table(gts);
+	if (ret)
+		return ret;
+
+	ret = iio_gts_build_avail_time_table(gts);
+	if (ret)
+		iio_gts_purge_avail_scale_table(gts);
+
+	return ret;
+}
+
+/**
+ * iio_gts_purge_avail_tables - free-up the availability tables
+ * @gts:	Gain time scale descriptor
+ *
+ * Free the space reserved by iio_gts_build_avail_tables(). Frees both the
+ * integration time and scale tables.
+ */
+static void iio_gts_purge_avail_tables(struct iio_gts *gts)
+{
+	iio_gts_purge_avail_time_table(gts);
+	iio_gts_purge_avail_scale_table(gts);
+}
+
+static void devm_iio_gts_avail_all_drop(void *res)
+{
+	iio_gts_purge_avail_tables(res);
+}
+
+/**
+ * devm_iio_gts_build_avail_tables - manged add availability tables
+ * @dev:	Pointer to the device whose lifetime tables are bound
+ * @gts:	Gain time scale descriptor
+ *
+ * Build the tables which can represent the available scales and available
+ * integration times. Availability tables are built based on the originally
+ * given gain and given time tables.
+ *
+ * When both time and gain tables are given this results:
+ * 1. A set of sorted tables representing available scales for each supported
+ *    integration time.
+ * 2. A single sorted table listing all the unique scales that any combination
+ *    of supported gains and times can provide.
+ * 3. A sorted table of supported integration times
+ *
+ * After these tables are built one can use the iio_gts_all_avail_scales(),
+ * iio_gts_avail_scales_for_time() and iio_gts_avail_times() helpers to
+ * implement the read_avail operations.
+ *
+ * The tables are automatically released upon device detach.
+ *
+ * Return: 0 on success.
+ */
+static int devm_iio_gts_build_avail_tables(struct device *dev,
+					   struct iio_gts *gts)
+{
+	int ret;
+
+	ret = iio_gts_build_avail_tables(gts);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, devm_iio_gts_avail_all_drop, gts);
+}
+
+static int sanity_check_time(const struct iio_itime_sel_mul *t)
+{
+	if (t->sel < 0 || t->time_us < 0 || t->mul <= 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int sanity_check_gain(const struct iio_gain_sel_pair *g)
+{
+	if (g->sel < 0 || g->gain <= 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int iio_gts_sanity_check(struct iio_gts *gts)
+{
+	int g, t, ret;
+
+	if (!gts->num_hwgain && !gts->num_itime)
+		return -EINVAL;
+
+	for (t = 0; t < gts->num_itime; t++) {
+		ret = sanity_check_time(&gts->itime_table[t]);
+		if (ret)
+			return ret;
+	}
+
+	for (g = 0; g < gts->num_hwgain; g++) {
+		ret = sanity_check_gain(&gts->hwgain_table[g]);
+		if (ret)
+			return ret;
+	}
+
+	for (g = 0; g < gts->num_hwgain; g++) {
+		for (t = 0; t < gts->num_itime; t++) {
+			int gain, mul, res;
+
+			gain = gts->hwgain_table[g].gain;
+			mul = gts->itime_table[t].mul;
+
+			if (check_mul_overflow(gain, mul, &res))
+				return -EOVERFLOW;
+		}
+	}
+
+	return 0;
+}
+
+static int iio_init_iio_gts(int max_scale_int, int max_scale_nano,
+			const struct iio_gain_sel_pair *gain_tbl, int num_gain,
+			const struct iio_itime_sel_mul *tim_tbl, int num_times,
+			struct iio_gts *gts)
+{
+	int ret;
+
+	memset(gts, 0, sizeof(*gts));
+
+	ret = iio_gts_linearize(max_scale_int, max_scale_nano, NANO,
+				   &gts->max_scale);
+	if (ret)
+		return ret;
+
+	gts->hwgain_table = gain_tbl;
+	gts->num_hwgain = num_gain;
+	gts->itime_table = tim_tbl;
+	gts->num_itime = num_times;
+
+	return iio_gts_sanity_check(gts);
+}
+
+/**
+ * devm_iio_init_iio_gts - Initialize the gain-time-scale helper
+ * @dev:		Pointer to the device whose lifetime gts resources are
+ *			bound
+ * @max_scale_int:	integer part of the maximum scale value
+ * @max_scale_nano:	fraction part of the maximum scale value
+ * @gain_tbl:		table describing supported gains
+ * @num_gain:		number of gains in the gain table
+ * @tim_tbl:		table describing supported integration times. Provide
+ *			the integration time table sorted so that the preferred
+ *			integration time is in the first array index. The search
+ *			functions like the
+ *			iio_gts_find_time_and_gain_sel_for_scale() start search
+ *			from first provided time.
+ * @num_times:		number of times in the time table
+ * @gts:		pointer to the helper struct
+ *
+ * Initialize the gain-time-scale helper for use. Note, gains, times, selectors
+ * and multipliers must be positive. Negative values are reserved for error
+ * checking. The total gain (maximum gain * maximum time multiplier) must not
+ * overflow int. The allocated resources will be released upon device detach.
+ *
+ * Return: 0 on success.
+ */
+int devm_iio_init_iio_gts(struct device *dev, int max_scale_int, int max_scale_nano,
+			  const struct iio_gain_sel_pair *gain_tbl, int num_gain,
+			  const struct iio_itime_sel_mul *tim_tbl, int num_times,
+			  struct iio_gts *gts)
+{
+	int ret;
+
+	ret = iio_init_iio_gts(max_scale_int, max_scale_nano, gain_tbl,
+			       num_gain, tim_tbl, num_times, gts);
+	if (ret)
+		return ret;
+
+	return devm_iio_gts_build_avail_tables(dev, gts);
+}
+EXPORT_SYMBOL_NS_GPL(devm_iio_init_iio_gts, IIO_GTS_HELPER);
+
+/**
+ * iio_gts_all_avail_scales - helper for listing all available scales
+ * @gts:	Gain time scale descriptor
+ * @vals:	Returned array of supported scales
+ * @type:	Type of returned scale values
+ * @length:	Amount of returned values in array
+ *
+ * Return: a value suitable to be returned from read_avail or a negative error.
+ */
+int iio_gts_all_avail_scales(struct iio_gts *gts, const int **vals, int *type,
+			     int *length)
+{
+	if (!gts->num_avail_all_scales)
+		return -EINVAL;
+
+	*vals = gts->avail_all_scales_table;
+	*type = IIO_VAL_INT_PLUS_NANO;
+	*length = gts->num_avail_all_scales * 2;
+
+	return IIO_AVAIL_LIST;
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_all_avail_scales, IIO_GTS_HELPER);
+
+/**
+ * iio_gts_avail_scales_for_time - list scales for integration time
+ * @gts:	Gain time scale descriptor
+ * @time:	Integration time for which the scales are listed
+ * @vals:	Returned array of supported scales
+ * @type:	Type of returned scale values
+ * @length:	Amount of returned values in array
+ *
+ * Drivers which do not allow scale setting to change integration time can
+ * use this helper to list only the scales which are valid for given integration
+ * time.
+ *
+ * Return: a value suitable to be returned from read_avail or a negative error.
+ */
+int iio_gts_avail_scales_for_time(struct iio_gts *gts, int time,
+				  const int **vals, int *type, int *length)
+{
+	int i;
+
+	for (i = 0; i < gts->num_itime; i++)
+		if (gts->itime_table[i].time_us == time)
+			break;
+
+	if (i == gts->num_itime)
+		return -EINVAL;
+
+	*vals = gts->per_time_avail_scale_tables[i];
+	*type = IIO_VAL_INT_PLUS_NANO;
+	*length = gts->num_hwgain * 2;
+
+	return IIO_AVAIL_LIST;
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_avail_scales_for_time, IIO_GTS_HELPER);
+
+/**
+ * iio_gts_avail_times - helper for listing available integration times
+ * @gts:	Gain time scale descriptor
+ * @vals:	Returned array of supported times
+ * @type:	Type of returned scale values
+ * @length:	Amount of returned values in array
+ *
+ * Return: a value suitable to be returned from read_avail or a negative error.
+ */
+int iio_gts_avail_times(struct iio_gts *gts,  const int **vals, int *type,
+			int *length)
+{
+	if (!gts->num_avail_time_tables)
+		return -EINVAL;
+
+	*vals = gts->avail_time_tables;
+	*type = IIO_VAL_INT;
+	*length = gts->num_avail_time_tables;
+
+	return IIO_AVAIL_LIST;
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_avail_times, IIO_GTS_HELPER);
+
+/**
+ * iio_gts_find_sel_by_gain - find selector corresponding to a HW-gain
+ * @gts:	Gain time scale descriptor
+ * @gain:	HW-gain for which matching selector is searched for
+ *
+ * Return:	a selector matching given HW-gain or -EINVAL if selector was
+ *		not found.
+ */
+int iio_gts_find_sel_by_gain(struct iio_gts *gts, int gain)
+{
+	int i;
+
+	for (i = 0; i < gts->num_hwgain; i++)
+		if (gts->hwgain_table[i].gain == gain)
+			return gts->hwgain_table[i].sel;
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_find_sel_by_gain, IIO_GTS_HELPER);
+
+/**
+ * iio_gts_find_gain_by_sel - find HW-gain corresponding to a selector
+ * @gts:	Gain time scale descriptor
+ * @sel:	selector for which matching HW-gain is searched for
+ *
+ * Return:	a HW-gain matching given selector or -EINVAL if HW-gain was not
+ *		found.
+ */
+int iio_gts_find_gain_by_sel(struct iio_gts *gts, int sel)
+{
+	int i;
+
+	for (i = 0; i < gts->num_hwgain; i++)
+		if (gts->hwgain_table[i].sel == sel)
+			return gts->hwgain_table[i].gain;
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_find_gain_by_sel, IIO_GTS_HELPER);
+
+/**
+ * iio_gts_get_min_gain - find smallest valid HW-gain
+ * @gts:	Gain time scale descriptor
+ *
+ * Return:	The smallest HW-gain -EINVAL if no HW-gains were in the tables.
+ */
+int iio_gts_get_min_gain(struct iio_gts *gts)
+{
+	int i, min = -EINVAL;
+
+	for (i = 0; i < gts->num_hwgain; i++) {
+		int gain = gts->hwgain_table[i].gain;
+
+		if (min == -EINVAL)
+			min = gain;
+		else
+			min = min(min, gain);
+	}
+
+	return min;
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_get_min_gain, IIO_GTS_HELPER);
+
+/**
+ * iio_find_closest_gain_low - Find the closest lower matching gain
+ * @gts:	Gain time scale descriptor
+ * @gain:	HW-gain for which the closest match is searched
+ * @in_range:	indicate if the @gain was actually in the range of
+ *		supported gains.
+ *
+ * Search for closest supported gain that is lower than or equal to the
+ * gain given as a parameter. This is usable for drivers which do not require
+ * user to request exact matching gain but rather for rounding to a supported
+ * gain value which is equal or lower (setting lower gain is typical for
+ * avoiding saturation)
+ *
+ * Return:	The closest matching supported gain or -EINVAL if @gain
+ *		was smaller than the smallest supported gain.
+ */
+int iio_find_closest_gain_low(struct iio_gts *gts, int gain, bool *in_range)
+{
+	int i, diff = 0;
+	int best = -1;
+
+	*in_range = false;
+
+	for (i = 0; i < gts->num_hwgain; i++) {
+		if (gain == gts->hwgain_table[i].gain) {
+			*in_range = true;
+			return gain;
+		}
+
+		if (gain > gts->hwgain_table[i].gain) {
+			if (!diff) {
+				diff = gain - gts->hwgain_table[i].gain;
+				best = i;
+			} else {
+				int tmp = gain - gts->hwgain_table[i].gain;
+
+				if (tmp < diff) {
+					diff = tmp;
+					best = i;
+				}
+			}
+		} else {
+			/*
+			 * We found valid HW-gain which is greater than
+			 * reference. So, unless we return a failure below we
+			 * will have found an in-range gain
+			 */
+			*in_range = true;
+		}
+	}
+	/* The requested gain was smaller than anything we support */
+	if (!diff) {
+		*in_range = false;
+
+		return -EINVAL;
+	}
+
+	return gts->hwgain_table[best].gain;
+}
+EXPORT_SYMBOL_NS_GPL(iio_find_closest_gain_low, IIO_GTS_HELPER);
+
+static int iio_gts_get_int_time_gain_multiplier_by_sel(struct iio_gts *gts,
+						       int sel)
+{
+	const struct iio_itime_sel_mul *time;
+
+	time = iio_gts_find_itime_by_sel(gts, sel);
+	if (!time)
+		return -EINVAL;
+
+	return time->mul;
+}
+
+/**
+ * iio_gts_find_gain_for_scale_using_time - Find gain by time and scale
+ * @gts:	Gain time scale descriptor
+ * @time_sel:	Integration time selector corresponding to the time gain is
+ *		searched for
+ * @scale_int:	Integral part of the scale (typically val1)
+ * @scale_nano:	Fractional part of the scale (nano or ppb)
+ * @gain:	Pointer to value where gain is stored.
+ *
+ * In some cases the light sensors may want to find a gain setting which
+ * corresponds given scale and integration time. Sensors which fill the
+ * gain and time tables may use this helper to retrieve the gain.
+ *
+ * Return:	0 on success. -EINVAL if gain matching the parameters is not
+ *		found.
+ */
+static int iio_gts_find_gain_for_scale_using_time(struct iio_gts *gts, int time_sel,
+						  int scale_int, int scale_nano,
+						  int *gain)
+{
+	u64 scale_linear;
+	int ret, mul;
+
+	ret = iio_gts_linearize(scale_int, scale_nano, NANO, &scale_linear);
+	if (ret)
+		return ret;
+
+	ret = iio_gts_get_int_time_gain_multiplier_by_sel(gts, time_sel);
+	if (ret < 0)
+		return ret;
+
+	mul = ret;
+
+	ret = gain_get_scale_fraction(gts->max_scale, scale_linear, mul, gain);
+	if (ret)
+		return ret;
+
+	if (!iio_gts_valid_gain(gts, *gain))
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * iio_gts_find_gain_sel_for_scale_using_time - Fetch gain selector.
+ * @gts:	Gain time scale descriptor
+ * @time_sel:	Integration time selector corresponding to the time gain is
+ *		searched for
+ * @scale_int:	Integral part of the scale (typically val1)
+ * @scale_nano:	Fractional part of the scale (nano or ppb)
+ * @gain_sel:	Pointer to value where gain selector is stored.
+ *
+ * See iio_gts_find_gain_for_scale_using_time() for more information
+ */
+int iio_gts_find_gain_sel_for_scale_using_time(struct iio_gts *gts, int time_sel,
+					       int scale_int, int scale_nano,
+					       int *gain_sel)
+{
+	int gain, ret;
+
+	ret = iio_gts_find_gain_for_scale_using_time(gts, time_sel, scale_int,
+						     scale_nano, &gain);
+	if (ret)
+		return ret;
+
+	ret = iio_gts_find_sel_by_gain(gts, gain);
+	if (ret < 0)
+		return ret;
+
+	*gain_sel = ret;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_find_gain_sel_for_scale_using_time, IIO_GTS_HELPER);
+
+static int iio_gts_get_total_gain(struct iio_gts *gts, int gain, int time)
+{
+	const struct iio_itime_sel_mul *itime;
+
+	if (!iio_gts_valid_gain(gts, gain))
+		return -EINVAL;
+
+	if (!gts->num_itime)
+		return gain;
+
+	itime = iio_gts_find_itime_by_time(gts, time);
+	if (!itime)
+		return -EINVAL;
+
+	return gain * itime->mul;
+}
+
+static int iio_gts_get_scale_linear(struct iio_gts *gts, int gain, int time,
+				    u64 *scale)
+{
+	int total_gain;
+	u64 tmp;
+
+	total_gain = iio_gts_get_total_gain(gts, gain, time);
+	if (total_gain < 0)
+		return total_gain;
+
+	tmp = gts->max_scale;
+
+	do_div(tmp, total_gain);
+
+	*scale = tmp;
+
+	return 0;
+}
+
+/**
+ * iio_gts_get_scale - get scale based on integration time and HW-gain
+ * @gts:	Gain time scale descriptor
+ * @gain:	HW-gain for which the scale is computed
+ * @time:	Integration time for which the scale is computed
+ * @scale_int:	Integral part of the scale (typically val1)
+ * @scale_nano:	Fractional part of the scale (nano or ppb)
+ *
+ * Compute scale matching the integration time and HW-gain given as parameter.
+ *
+ * Return: 0 on success.
+ */
+int iio_gts_get_scale(struct iio_gts *gts, int gain, int time, int *scale_int,
+		      int *scale_nano)
+{
+	u64 lin_scale;
+	int ret;
+
+	ret = iio_gts_get_scale_linear(gts, gain, time, &lin_scale);
+	if (ret)
+		return ret;
+
+	return iio_gts_delinearize(lin_scale, NANO, scale_int, scale_nano);
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_get_scale, IIO_GTS_HELPER);
+
+/**
+ * iio_gts_find_new_gain_sel_by_old_gain_time - compensate for time change
+ * @gts:		Gain time scale descriptor
+ * @old_gain:		Previously set gain
+ * @old_time_sel:	Selector corresponding previously set time
+ * @new_time_sel:	Selector corresponding new time to be set
+ * @new_gain:		Pointer to value where new gain is to be written
+ *
+ * We may want to mitigate the scale change caused by setting a new integration
+ * time (for a light sensor) by also updating the (HW)gain. This helper computes
+ * new gain value to maintain the scale with new integration time.
+ *
+ * Return: 0 if an exactly matching supported new gain was found. When a
+ * non-zero value is returned, the @new_gain will be set to a negative or
+ * positive value. The negative value means that no gain could be computed.
+ * Positive value will be the "best possible new gain there could be". There
+ * can be two reasons why finding the "best possible" new gain is not deemed
+ * successful. 1) This new value cannot be supported by the hardware. 2) The new
+ * gain required to maintain the scale would not be an integer. In this case,
+ * the "best possible" new gain will be a floored optimal gain, which may or
+ * may not be supported by the hardware.
+ */
+int iio_gts_find_new_gain_sel_by_old_gain_time(struct iio_gts *gts,
+					       int old_gain, int old_time_sel,
+					       int new_time_sel, int *new_gain)
+{
+	const struct iio_itime_sel_mul *itime_old, *itime_new;
+	u64 scale;
+	int ret;
+
+	*new_gain = -1;
+
+	itime_old = iio_gts_find_itime_by_sel(gts, old_time_sel);
+	if (!itime_old)
+		return -EINVAL;
+
+	itime_new = iio_gts_find_itime_by_sel(gts, new_time_sel);
+	if (!itime_new)
+		return -EINVAL;
+
+	ret = iio_gts_get_scale_linear(gts, old_gain, itime_old->time_us,
+				       &scale);
+	if (ret)
+		return ret;
+
+	ret = gain_get_scale_fraction(gts->max_scale, scale, itime_new->mul,
+				      new_gain);
+	if (ret)
+		return ret;
+
+	if (!iio_gts_valid_gain(gts, *new_gain))
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_find_new_gain_sel_by_old_gain_time, IIO_GTS_HELPER);
+
+/**
+ * iio_gts_find_new_gain_by_old_gain_time - compensate for time change
+ * @gts:		Gain time scale descriptor
+ * @old_gain:		Previously set gain
+ * @old_time:		Selector corresponding previously set time
+ * @new_time:		Selector corresponding new time to be set
+ * @new_gain:		Pointer to value where new gain is to be written
+ *
+ * We may want to mitigate the scale change caused by setting a new integration
+ * time (for a light sensor) by also updating the (HW)gain. This helper computes
+ * new gain value to maintain the scale with new integration time.
+ *
+ * Return: 0 if an exactly matching supported new gain was found. When a
+ * non-zero value is returned, the @new_gain will be set to a negative or
+ * positive value. The negative value means that no gain could be computed.
+ * Positive value will be the "best possible new gain there could be". There
+ * can be two reasons why finding the "best possible" new gain is not deemed
+ * successful. 1) This new value cannot be supported by the hardware. 2) The new
+ * gain required to maintain the scale would not be an integer. In this case,
+ * the "best possible" new gain will be a floored optimal gain, which may or
+ * may not be supported by the hardware.
+ */
+int iio_gts_find_new_gain_by_old_gain_time(struct iio_gts *gts, int old_gain,
+					   int old_time, int new_time,
+					   int *new_gain)
+{
+	const struct iio_itime_sel_mul *itime_new;
+	u64 scale;
+	int ret;
+
+	*new_gain = -1;
+
+	itime_new = iio_gts_find_itime_by_time(gts, new_time);
+	if (!itime_new)
+		return -EINVAL;
+
+	ret = iio_gts_get_scale_linear(gts, old_gain, old_time, &scale);
+	if (ret)
+		return ret;
+
+	ret = gain_get_scale_fraction(gts->max_scale, scale, itime_new->mul,
+				      new_gain);
+	if (ret)
+		return ret;
+
+	if (!iio_gts_valid_gain(gts, *new_gain))
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(iio_gts_find_new_gain_by_old_gain_time, IIO_GTS_HELPER);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Matti Vaittinen <[e-mail]>");
+MODULE_DESCRIPTION("IIO light sensor gain-time-scale helpers");

drivers/iio/industrialio-trigger.c

···
 		schedule_work(&trig->reenable_work);
 }
 
+/**
+ * iio_trigger_poll() - Call the IRQ trigger handler of the consumers
+ * @trig: trigger which occurred
+ *
+ * This function should only be called from a hard IRQ context.
+ */
 void iio_trigger_poll(struct iio_trigger *trig)
 {
 	int i;
···
 }
 EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
 
-void iio_trigger_poll_chained(struct iio_trigger *trig)
+/**
+ * iio_trigger_poll_nested() - Call the threaded trigger handler of the
+ * consumers
+ * @trig: trigger which occurred
+ *
+ * This function should only be called from a kernel thread context.
+ */
+void iio_trigger_poll_nested(struct iio_trigger *trig)
 {
 	int i;
 
···
 		}
 	}
 }
-EXPORT_SYMBOL(iio_trigger_poll_chained);
+EXPORT_SYMBOL(iio_trigger_poll_nested);
 
 void iio_trigger_notify_done(struct iio_trigger *trig)
 {

drivers/iio/light/Kconfig

···
 	  To compile this driver as a module, choose M here:
 	  the module will be called jsa1212.
 
+config ROHM_BU27034
+	tristate "ROHM BU27034 ambient light sensor"
+	depends on I2C
+	select REGMAP_I2C
+	select IIO_GTS_HELPER
+	select IIO_BUFFER
+	select IIO_KFIFO_BUF
+	help
+	  Enable support for the ROHM BU27034 ambient light sensor. ROHM BU27034
+	  is an ambient light sesnor with 3 channels and 3 photo diodes capable
+	  of detecting a very wide range of illuminance.
+	  Typical application is adjusting LCD and backlight power of TVs and
+	  mobile phones.
+
 config RPR0521
 	tristate "ROHM RPR0521 ALS and proximity sensor driver"
 	depends on I2C

drivers/iio/light/Makefile

···
 obj-$(CONFIG_NOA1305)		+= noa1305.o
 obj-$(CONFIG_OPT3001)		+= opt3001.o
 obj-$(CONFIG_PA12203001)	+= pa12203001.o
+obj-$(CONFIG_ROHM_BU27034)	+= rohm-bu27034.o
 obj-$(CONFIG_RPR0521)		+= rpr0521.o
 obj-$(CONFIG_SI1133)		+= si1133.o
 obj-$(CONFIG_SI1145)		+= si1145.o

drivers/iio/light/acpi-als.c

···
 	if (iio_buffer_enabled(indio_dev) && iio_trigger_using_own(indio_dev)) {
 		switch (event) {
 		case ACPI_ALS_NOTIFY_ILLUMINANCE:
-			iio_trigger_poll_chained(als->trig);
+			iio_trigger_poll_nested(als->trig);
 			break;
 		default:
 			/* Unhandled event */

drivers/iio/light/max44009.c

···
 	return devm_iio_device_register(&client->dev, indio_dev);
 }
 
+static const struct of_device_id max44009_of_match[] = {
+	{ .compatible = "maxim,max44009" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max44009_of_match);
+
 static const struct i2c_device_id max44009_id[] = {
 	{ "max44009", 0 },
 	{ }
···
 static struct i2c_driver max44009_driver = {
 	.driver = {
 		.name = MAX44009_DRV_NAME,
+		.of_match_table = max44009_of_match,
 	},
 	.probe_new = max44009_probe,
 	.id_table = max44009_id,
 };
 module_i2c_driver(max44009_driver);
-
-static const struct of_device_id max44009_of_match[] = {
-	{ .compatible = "maxim,max44009" },
-	{ }
-};
-MODULE_DEVICE_TABLE(of, max44009_of_match);
 
 MODULE_AUTHOR("Robert Eshleman <[e-mail]>");
 MODULE_LICENSE("GPL v2");

drivers/iio/light/rohm-bu27034.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * BU27034 ROHM Ambient Light Sensor
+ *
+ * Copyright (c) 2023, ROHM Semiconductor.
+ * https://fscdn.rohm.com/en/products/databook/datasheet/ic/sensor/light/bu27034nuc-e.pdf
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/units.h>
+
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/iio-gts-helper.h>
+#include <linux/iio/kfifo_buf.h>
+
+#define BU27034_REG_SYSTEM_CONTROL	0x40
+#define BU27034_MASK_SW_RESET		BIT(7)
+#define BU27034_MASK_PART_ID		GENMASK(5, 0)
+#define BU27034_ID			0x19
+#define BU27034_REG_MODE_CONTROL1	0x41
+#define BU27034_MASK_MEAS_MODE		GENMASK(2, 0)
+
+#define BU27034_REG_MODE_CONTROL2	0x42
+#define BU27034_MASK_D01_GAIN		GENMASK(7, 3)
+#define BU27034_MASK_D2_GAIN_HI		GENMASK(7, 6)
+#define BU27034_MASK_D2_GAIN_LO		GENMASK(2, 0)
+
+#define BU27034_REG_MODE_CONTROL3	0x43
+#define BU27034_REG_MODE_CONTROL4	0x44
+#define BU27034_MASK_MEAS_EN		BIT(0)
+#define BU27034_MASK_VALID		BIT(7)
+#define BU27034_REG_DATA0_LO		0x50
+#define BU27034_REG_DATA1_LO		0x52
+#define BU27034_REG_DATA2_LO		0x54
+#define BU27034_REG_DATA2_HI		0x55
+#define BU27034_REG_MANUFACTURER_ID	0x92
+#define BU27034_REG_MAX BU27034_REG_MANUFACTURER_ID
+
+/*
+ * The BU27034 does not have interrupt to trigger the data read when a
+ * measurement has finished. Hence we poll the VALID bit in a thread. We will
+ * try to wake the thread BU27034_MEAS_WAIT_PREMATURE_MS milliseconds before
+ * the expected sampling time to prevent the drifting.
+ *
+ * If we constantly wake up a bit too late we would eventually skip a sample.
+ * And because the sleep can't wake up _exactly_ at given time this would be
+ * inevitable even if the sensor clock would be perfectly phase-locked to CPU
+ * clock - which we can't say is the case.
+ *
+ * This is still fragile. No matter how big advance do we have, we will still
+ * risk of losing a sample because things can in a rainy-day scenario be
+ * delayed a lot. Yet, more we reserve the time for polling, more we also lose
+ * the performance by spending cycles polling the register. So, selecting this
+ * value is a balancing dance between severity of wasting CPU time and severity
+ * of losing samples.
+ *
+ * In most cases losing the samples is not _that_ crucial because light levels
+ * tend to change slowly.
+ *
+ * Other option that was pointed to me would be always sleeping 1/2 of the
+ * measurement time, checking the VALID bit and just sleeping again if the bit
+ * was not set. That should be pretty tolerant against missing samples due to
+ * the scheduling delays while also not wasting much of cycles for polling.
+ * Downside is that the time-stamps would be very inaccurate as the wake-up
+ * would not really be tied to the sensor toggling the valid bit. This would also
+ * result 'jumps' in the time-stamps when the delay drifted so that wake-up was
+ * performed during the consecutive wake-ups (Or, when sensor and CPU clocks
+ * were very different and scheduling the wake-ups was very close to given
+ * timeout - and when the time-outs were very close to the actual sensor
+ * sampling, Eg. once in a blue moon, two consecutive time-outs would occur
+ * without having a sample ready).
+ */
+#define BU27034_MEAS_WAIT_PREMATURE_MS	5
+#define BU27034_DATA_WAIT_TIME_US	1000
+#define BU27034_TOTAL_DATA_WAIT_TIME_US (BU27034_MEAS_WAIT_PREMATURE_MS * 1000)
+
+#define BU27034_RETRY_LIMIT 18
+
+enum {
+	BU27034_CHAN_ALS,
+	BU27034_CHAN_DATA0,
+	BU27034_CHAN_DATA1,
+	BU27034_CHAN_DATA2,
+	BU27034_NUM_CHANS
+};
+
+static const unsigned long bu27034_scan_masks[] = {
+	GENMASK(BU27034_CHAN_DATA2, BU27034_CHAN_ALS), 0
+};
+
+/*
+ * Available scales with gain 1x - 4096x, timings 55, 100, 200, 400 mS
+ * Time impacts to gain: 1x, 2x, 4x, 8x.
+ *
+ * => Max total gain is HWGAIN * gain by integration time (8 * 4096) = 32768
+ *
+ * Using NANO precision for scale we must use scale 64x corresponding gain 1x
+ * to avoid precision loss. (32x would result scale 976 562.5(nanos).
+ */
+#define BU27034_SCALE_1X	64
+
+/* See the data sheet for the "Gain Setting" table */
+#define BU27034_GSEL_1X		0x00 /* 00000 */
+#define BU27034_GSEL_4X		0x08 /* 01000 */
+#define BU27034_GSEL_16X	0x0a /* 01010 */
+#define BU27034_GSEL_32X	0x0b /* 01011 */
+#define BU27034_GSEL_64X	0x0c /* 01100 */
+#define BU27034_GSEL_256X	0x18 /* 11000 */
+#define BU27034_GSEL_512X	0x19 /* 11001 */
+#define BU27034_GSEL_1024X	0x1a /* 11010 */
+#define BU27034_GSEL_2048X	0x1b /* 11011 */
+#define BU27034_GSEL_4096X	0x1c /* 11100 */
+
+/* Available gain settings */
+static const struct iio_gain_sel_pair bu27034_gains[] = {
+	GAIN_SCALE_GAIN(1, BU27034_GSEL_1X),
+	GAIN_SCALE_GAIN(4, BU27034_GSEL_4X),
+	GAIN_SCALE_GAIN(16, BU27034_GSEL_16X),
+	GAIN_SCALE_GAIN(32, BU27034_GSEL_32X),
+	GAIN_SCALE_GAIN(64, BU27034_GSEL_64X),
+	GAIN_SCALE_GAIN(256, BU27034_GSEL_256X),
+	GAIN_SCALE_GAIN(512, BU27034_GSEL_512X),
+	GAIN_SCALE_GAIN(1024, BU27034_GSEL_1024X),
+	GAIN_SCALE_GAIN(2048, BU27034_GSEL_2048X),
+	GAIN_SCALE_GAIN(4096, BU27034_GSEL_4096X),
+};
+
+/*
+ * The IC has 5 modes for sampling time. 5 mS mode is exceptional as it limits
+ * the data collection to data0-channel only and cuts the supported range to
+ * 10 bit. It is not supported by the driver.
+ *
+ * "normal" modes are 55, 100, 200 and 400 mS modes - which do have direct
+ * multiplying impact to the register values (similar to gain).
+ *
+ * This means that if meas-mode is changed for example from 400 => 200,
+ * the scale is doubled. Eg, time impact to total gain is x1, x2, x4, x8.
+ */
+#define BU27034_MEAS_MODE_100MS		0
+#define BU27034_MEAS_MODE_55MS		1
+#define BU27034_MEAS_MODE_200MS		2
+#define BU27034_MEAS_MODE_400MS		4
+
+static const struct iio_itime_sel_mul bu27034_itimes[] = {
+	GAIN_SCALE_ITIME_US(400000, BU27034_MEAS_MODE_400MS, 8),
+	GAIN_SCALE_ITIME_US(200000, BU27034_MEAS_MODE_200MS, 4),
+	GAIN_SCALE_ITIME_US(100000, BU27034_MEAS_MODE_100MS, 2),
+	GAIN_SCALE_ITIME_US(55000, BU27034_MEAS_MODE_55MS, 1),
+};
+
+#define BU27034_CHAN_DATA(_name, _ch2)					\
+{									\
+	.type = IIO_INTENSITY,						\
+	.channel = BU27034_CHAN_##_name,				\
+	.channel2 = (_ch2),						\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |			\
+			      BIT(IIO_CHAN_INFO_SCALE),			\
+	.info_mask_separate_available = BIT(IIO_CHAN_INFO_SCALE),	\
+	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME),		\
+	.info_mask_shared_by_all_available =				\
+					BIT(IIO_CHAN_INFO_INT_TIME),	\
+	.address = BU27034_REG_##_name##_LO,				\
+	.scan_index = BU27034_CHAN_##_name,				\
+	.scan_type = {							\
+		.sign = 'u',						\
+		.realbits = 16,						\
+		.storagebits = 16,					\
+		.endianness = IIO_LE,					\
+	},								\
+	.indexed = 1,							\
+}
+
+static const struct iio_chan_spec bu27034_channels[] = {
+	{
+		.type = IIO_LIGHT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.channel = BU27034_CHAN_ALS,
+		.scan_index = BU27034_CHAN_ALS,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 32,
+			.storagebits = 32,
+			.endianness = IIO_CPU,
+		},
+	},
+	/*
+	 * The BU27034 DATA0 and DATA1 channels are both on the visible light
+	 * area (mostly). The data0 sensitivity peaks at 500nm, DATA1 at 600nm.
+	 * These wave lengths are pretty much on the border of colours making
+	 * these a poor candidates for R/G/B standardization. Hence they're both
+	 * marked as clear channels
+	 */
+	BU27034_CHAN_DATA(DATA0, IIO_MOD_LIGHT_CLEAR),
+	BU27034_CHAN_DATA(DATA1, IIO_MOD_LIGHT_CLEAR),
+	BU27034_CHAN_DATA(DATA2, IIO_MOD_LIGHT_IR),
+	IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
+struct bu27034_data {
+	struct regmap *regmap;
+	struct device *dev;
+	/*
+	 * Protect gain and time during scale adjustment and data reading.
+	 * Protect measurement enabling/disabling.
+	 */
+	struct mutex mutex;
+	struct iio_gts gts;
+	struct task_struct *task;
+	__le16 raw[3];
+	struct {
+		u32 mlux;
+		__le16 channels[3];
+		s64 ts __aligned(8);
+	} scan;
+};
+
+struct bu27034_result {
+	u16 ch0;
+	u16 ch1;
+	u16 ch2;
+};
+
+static const struct regmap_range bu27034_volatile_ranges[] = {
+	{
+		.range_min = BU27034_REG_MODE_CONTROL4,
+		.range_max = BU27034_REG_MODE_CONTROL4,
+	}, {
+		.range_min = BU27034_REG_DATA0_LO,
+		.range_max = BU27034_REG_DATA2_HI,
+	},
+};
+
+static const struct regmap_access_table bu27034_volatile_regs = {
+	.yes_ranges = &bu27034_volatile_ranges[0],
+	.n_yes_ranges = ARRAY_SIZE(bu27034_volatile_ranges),
+};
+
+static const struct regmap_range bu27034_read_only_ranges[] = {
+	{
+		.range_min = BU27034_REG_DATA0_LO,
+		.range_max = BU27034_REG_DATA2_HI,
+	}, {
+		.range_min = BU27034_REG_MANUFACTURER_ID,
+		.range_max = BU27034_REG_MANUFACTURER_ID,
+	}
+};
+
+static const struct regmap_access_table bu27034_ro_regs = {
+	.no_ranges = &bu27034_read_only_ranges[0],
+	.n_no_ranges = ARRAY_SIZE(bu27034_read_only_ranges),
+};
+
+static const struct regmap_config bu27034_regmap = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = BU27034_REG_MAX,
+	.cache_type = REGCACHE_RBTREE,
+	.volatile_table = &bu27034_volatile_regs,
+	.wr_table = &bu27034_ro_regs,
+};
+
+struct bu27034_gain_check {
+	int old_gain;
+	int new_gain;
+	int chan;
+};
+
+static int bu27034_get_gain_sel(struct bu27034_data *data, int chan)
+{
+	int ret, val;
+
+	switch (chan) {
+	case BU27034_CHAN_DATA0:
+	case BU27034_CHAN_DATA1:
+	{
+		int reg[] = {
+			[BU27034_CHAN_DATA0] = BU27034_REG_MODE_CONTROL2,
+			[BU27034_CHAN_DATA1] = BU27034_REG_MODE_CONTROL3,
+		};
+		ret = regmap_read(data->regmap, reg[chan], &val);
+		if (ret)
+			return ret;
+
+		return FIELD_GET(BU27034_MASK_D01_GAIN, val);
+	}
+	case BU27034_CHAN_DATA2:
+	{
+		int d2_lo_bits = fls(BU27034_MASK_D2_GAIN_LO);
+
+		ret = regmap_read(data->regmap, BU27034_REG_MODE_CONTROL2, &val);
+		if (ret)
+			return ret;
+
+		/*
+		 * The data2 channel gain is composed by 5 non continuous bits
+		 * [7:6], [2:0]. Thus when we combine the 5-bit 'selector'
+		 * from register value we must right shift the high bits by 3.
+		 */
+		return FIELD_GET(BU27034_MASK_D2_GAIN_HI, val) << d2_lo_bits |
+		       FIELD_GET(BU27034_MASK_D2_GAIN_LO, val);
+	}
+	default:
+		return -EINVAL;
+	}
+}
+
+static int bu27034_get_gain(struct bu27034_data *data, int chan, int *gain)
+{
+	int ret, sel;
+
+	ret = bu27034_get_gain_sel(data, chan);
+	if (ret < 0)
+		return ret;
+
+	sel = ret;
+
+	ret = iio_gts_find_gain_by_sel(&data->gts, sel);
+	if (ret < 0) {
+		dev_err(data->dev, "chan %u: unknown gain value 0x%x\n", chan,
+			sel);
+
+		return ret;
+	}
+
+	*gain = ret;
+
+	return 0;
+}
+
+static int bu27034_get_int_time(struct bu27034_data *data)
+{
+	int ret, sel;
+
+	ret = regmap_read(data->regmap, BU27034_REG_MODE_CONTROL1, &sel);
+	if (ret)
+		return ret;
+
+	return iio_gts_find_int_time_by_sel(&data->gts,
+					    sel & BU27034_MASK_MEAS_MODE);
+}
+
+static int _bu27034_get_scale(struct bu27034_data *data, int channel, int *val,
+			      int *val2)
+{
+	int gain, ret;
+
+	ret = bu27034_get_gain(data, channel, &gain);
+	if (ret)
+		return ret;
+
+	ret = bu27034_get_int_time(data);
+	if (ret < 0)
+		return ret;
+
+	return iio_gts_get_scale(&data->gts, gain, ret, val, val2);
+}
+
+static int bu27034_get_scale(struct bu27034_data *data, int channel, int *val,
+			      int *val2)
+{
+	int ret;
+
+	if (channel == BU27034_CHAN_ALS) {
+		*val = 0;
+		*val2 = 1000;
+		return IIO_VAL_INT_PLUS_MICRO;
+	}
+
+	mutex_lock(&data->mutex);
+	ret = _bu27034_get_scale(data, channel, val, val2);
+	mutex_unlock(&data->mutex);
+	if (ret)
+		return ret;
+
+	return IIO_VAL_INT_PLUS_NANO;
+}
+
+/* Caller should hold the lock to protect lux reading */
+static int bu27034_write_gain_sel(struct bu27034_data *data, int chan, int sel)
+{
+	static const int reg[] = {
+		[BU27034_CHAN_DATA0] = BU27034_REG_MODE_CONTROL2,
+		[BU27034_CHAN_DATA1] = BU27034_REG_MODE_CONTROL3,
+	};
+	int mask, val;
+
+	if (chan != BU27034_CHAN_DATA0 && chan != BU27034_CHAN_DATA1)
+		return -EINVAL;
+
+	val = FIELD_PREP(BU27034_MASK_D01_GAIN, sel);
+
+	mask = BU27034_MASK_D01_GAIN;
+
+	if (chan == BU27034_CHAN_DATA0) {
+		/*
+		 * We keep the same gain for channel 2 as we set for channel 0
+		 * We can't allow them to be individually controlled because
+		 * setting one will impact also the other. Also, if we don't
+		 * always update both gains we may result unsupported bit
+		 * combinations.
+		 *
+		 * This is not nice but this is yet another place where the
+		 * user space must be prepared to surprizes. Namely, see chan 2
+		 * gain changed when chan 0 gain is changed.
+		 *
+		 * This is not fatal for most users though. I don't expect the
+		 * channel 2 to be used in any generic cases - the intensity
+		 * values provided by the sensor for IR area are not openly
+		 * documented. Also, channel 2 is not used for visible light.
+		 *
+		 * So, if there is application which is written to utilize the
+		 * channel 2 - then it is probably specifically targeted to this
+		 * sensor and knows how to utilize those values. It is safe to
+		 * hope such user can also cope with the gain changes.
+		 */
+		mask |=  BU27034_MASK_D2_GAIN_LO;
+
+		/*
+		 * The D2 gain bits are directly the lowest bits of selector.
+		 * Just do add those bits to the value
+		 */
+		val |= sel & BU27034_MASK_D2_GAIN_LO;
+	}
+
+	return regmap_update_bits(data->regmap, reg[chan], mask, val);
+}
+
+static int bu27034_set_gain(struct bu27034_data *data, int chan, int gain)
+{
+	int ret;
+
+	/*
+	 * We don't allow setting channel 2 gain as it messes up the
+	 * gain for channel 0 - which shares the high bits
+	 */
+	if (chan != BU27034_CHAN_DATA0 && chan != BU27034_CHAN_DATA1)
+		return -EINVAL;
+
+	ret = iio_gts_find_sel_by_gain(&data->gts, gain);
+	if (ret < 0)
+		return ret;
+
+	return bu27034_write_gain_sel(data, chan, ret);
+}
+
+/* Caller should hold the lock to protect data->int_time */
+static int bu27034_set_int_time(struct bu27034_data *data, int time)
+{
+	int ret;
+
+	ret = iio_gts_find_sel_by_int_time(&data->gts, time);
+	if (ret < 0)
+		return ret;
+
+	return regmap_update_bits(data->regmap, BU27034_REG_MODE_CONTROL1,
+				 BU27034_MASK_MEAS_MODE, ret);
+}
+
+/*
+ * We try to change the time in such way that the scale is maintained for
+ * given channels by adjusting gain so that it compensates the time change.
+ */
+static int bu27034_try_set_int_time(struct bu27034_data *data, int time_us)
+{
+	struct bu27034_gain_check gains[] = {
+		{ .chan = BU27034_CHAN_DATA0 },
+		{ .chan = BU27034_CHAN_DATA1 },
+	};
+	int numg = ARRAY_SIZE(gains);
+	int ret, int_time_old, i;
+
+	mutex_lock(&data->mutex);
+	ret = bu27034_get_int_time(data);
+	if (ret < 0)
+		goto unlock_out;
+
+	int_time_old = ret;
+
+	if (!iio_gts_valid_time(&data->gts, time_us)) {
+		dev_err(data->dev, "Unsupported integration time %u\n",
+			time_us);
+		ret = -EINVAL;
+
+		goto unlock_out;
+	}
+
+	if (time_us == int_time_old) {
+		ret = 0;
+		goto unlock_out;
+	}
+
+	for (i = 0; i < numg; i++) {
+		ret = bu27034_get_gain(data, gains[i].chan, &gains[i].old_gain);
+		if (ret)
+			goto unlock_out;
+
+		ret = iio_gts_find_new_gain_by_old_gain_time(&data->gts,
+							     gains[i].old_gain,
+							     int_time_old, time_us,
+							     &gains[i].new_gain);
+		if (ret) {
+			int scale1, scale2;
+			bool ok;
+
+			_bu27034_get_scale(data, gains[i].chan, &scale1, &scale2);
+			dev_dbg(data->dev,
+				"chan %u, can't support time %u with scale %u %u\n",
+				gains[i].chan, time_us, scale1, scale2);
+
+			if (gains[i].new_gain < 0)
+				goto unlock_out;
+
+			/*
+			 * If caller requests for integration time change and we
+			 * can't support the scale - then the caller should be
+			 * prepared to 'pick up the pieces and deal with the
+			 * fact that the scale changed'.
+			 */
+			ret = iio_find_closest_gain_low(&data->gts,
+							gains[i].new_gain, &ok);
+
+			if (!ok)
+				dev_dbg(data->dev,
+					"optimal gain out of range for chan %u\n",
+					gains[i].chan);
+
+			if (ret < 0) {
+				dev_dbg(data->dev,
+					 "Total gain increase. Risk of saturation");
+				ret = iio_gts_get_min_gain(&data->gts);
+				if (ret < 0)
+					goto unlock_out;
+			}
+			dev_dbg(data->dev, "chan %u scale changed\n",
+				 gains[i].chan);
+			gains[i].new_gain = ret;
+			dev_dbg(data->dev, "chan %u new gain %u\n",
+				gains[i].chan, gains[i].new_gain);
+		}
+	}
+
+	for (i = 0; i < numg; i++) {
+		ret = bu27034_set_gain(data, gains[i].chan, gains[i].new_gain);
+		if (ret)
+			goto unlock_out;
+	}
+
+	ret = bu27034_set_int_time(data, time_us);
+
+unlock_out:
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static int bu27034_set_scale(struct bu27034_data *data, int chan,
+			    int val, int val2)
+{
+	int ret, time_sel, gain_sel, i;
+	bool found = false;
+
+	if (chan == BU27034_CHAN_DATA2)
+		return -EINVAL;
+
+	if (chan == BU27034_CHAN_ALS) {
+		if (val == 0 && val2 == 1000)
+			return 0;
+
+		return -EINVAL;
+	}
+
+	mutex_lock(&data->mutex);
+	ret = regmap_read(data->regmap, BU27034_REG_MODE_CONTROL1, &time_sel);
+	if (ret)
+		goto unlock_out;
+
+	ret = iio_gts_find_gain_sel_for_scale_using_time(&data->gts, time_sel,
+						val, val2 * 1000, &gain_sel);
+	if (ret) {
+		/*
+		 * Could not support scale with given time. Need to change time.
+		 * We still want to maintain the scale for all channels
+		 */
+		struct bu27034_gain_check gain;
+		int new_time_sel;
+
+		/*
+		 * Populate information for the other channel which should also
+		 * maintain the scale. (Due to the HW limitations the chan2
+		 * gets the same gain as chan0, so we only need to explicitly
+		 * set the chan 0 and 1).
+		 */
+		if (chan == BU27034_CHAN_DATA0)
+			gain.chan = BU27034_CHAN_DATA1;
+		else if (chan == BU27034_CHAN_DATA1)
+			gain.chan = BU27034_CHAN_DATA0;
+
+		ret = bu27034_get_gain(data, gain.chan, &gain.old_gain);
+		if (ret)
+			goto unlock_out;
+
+		/*
+		 * Iterate through all the times to see if we find one which
+		 * can support requested scale for requested channel, while
+		 * maintaining the scale for other channels
+		 */
+		for (i = 0; i < data->gts.num_itime; i++) {
+			new_time_sel = data->gts.itime_table[i].sel;
+
+			if (new_time_sel == time_sel)
+				continue;
+
+			/* Can we provide requested scale with this time? */
+			ret = iio_gts_find_gain_sel_for_scale_using_time(
+				&data->gts, new_time_sel, val, val2 * 1000,
+				&gain_sel);
+			if (ret)
+				continue;
+
+			/* Can the other channel(s) maintain scale? */
+			ret = iio_gts_find_new_gain_sel_by_old_gain_time(
+				&data->gts, gain.old_gain, time_sel,
+				new_time_sel, &gain.new_gain);
+			if (!ret) {
+				/* Yes - we found suitable time */
+				found = true;
+				break;
+			}
+		}
+		if (!found) {
+			dev_dbg(data->dev,
+				"Can't set scale maintaining other channels\n");
+			ret = -EINVAL;
+
+			goto unlock_out;
+		}
+
+		ret = bu27034_set_gain(data, gain.chan, gain.new_gain);
+		if (ret)
+			goto unlock_out;
+
+		ret = regmap_update_bits(data->regmap, BU27034_REG_MODE_CONTROL1,
+				  BU27034_MASK_MEAS_MODE, new_time_sel);
+		if (ret)
+			goto unlock_out;
+	}
+
+	ret = bu27034_write_gain_sel(data, chan, gain_sel);
+unlock_out:
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+/*
+ * for (D1/D0 < 0.87):
+ * lx = 0.004521097 * D1 - 0.002663996 * D0 +
+ *	0.00012213 * D1 * D1 / D0
+ *
+ * =>	115.7400832 * ch1 / gain1 / mt -
+ *	68.1982976 * ch0 / gain0 / mt +
+ *	0.00012213 * 25600 * (ch1 / gain1 / mt) * 25600 *
+ *	(ch1 /gain1 / mt) / (25600 * ch0 / gain0 / mt)
+ *
+ * A =	0.00012213 * 25600 * (ch1 /gain1 / mt) * 25600 *
+ *	(ch1 /gain1 / mt) / (25600 * ch0 / gain0 / mt)
+ * =>	0.00012213 * 25600 * (ch1 /gain1 / mt) *
+ *	(ch1 /gain1 / mt) / (ch0 / gain0 / mt)
+ * =>	0.00012213 * 25600 * (ch1 / gain1) * (ch1 /gain1 / mt) /
+ *	(ch0 / gain0)
+ * =>	0.00012213 * 25600 * (ch1 / gain1) * (ch1 /gain1 / mt) *
+ *	gain0 / ch0
+ * =>	3.126528 * ch1 * ch1 * gain0 / gain1 / gain1 / mt /ch0
+ *
+ * lx = (115.7400832 * ch1 / gain1 - 68.1982976 * ch0 / gain0) /
+ *	mt + A
+ * =>	(115.7400832 * ch1 / gain1 - 68.1982976 * ch0 / gain0) /
+ *	mt + 3.126528 * ch1 * ch1 * gain0 / gain1 / gain1 / mt /
+ *	ch0
+ *
+ * =>	(115.7400832 * ch1 / gain1 - 68.1982976 * ch0 / gain0 +
+ *	  3.126528 * ch1 * ch1 * gain0 / gain1 / gain1 / ch0) /
+ *	  mt
+ *
+ * For (0.87 <= D1/D0 < 1.00)
+ * lx = (0.001331* D0 + 0.0000354 * D1) * ((D1/D0 – 0.87) * (0.385) + 1)
+ * =>	(0.001331 * 256 * 100 * ch0 / gain0 / mt + 0.0000354 * 256 *
+ *	100 * ch1 / gain1 / mt) * ((D1/D0 -  0.87) * (0.385) + 1)
+ * =>	(34.0736 * ch0 / gain0 / mt + 0.90624 * ch1 / gain1 / mt) *
+ *	((D1/D0 -  0.87) * (0.385) + 1)
+ * =>	(34.0736 * ch0 / gain0 / mt + 0.90624 * ch1 / gain1 / mt) *
+ *	(0.385 * D1/D0 - 0.66505)
+ * =>	(34.0736 * ch0 / gain0 / mt + 0.90624 * ch1 / gain1 / mt) *
+ *	(0.385 * 256 * 100 * ch1 / gain1 / mt / (256 * 100 * ch0 / gain0 / mt) - 0.66505)
+ * =>	(34.0736 * ch0 / gain0 / mt + 0.90624 * ch1 / gain1 / mt) *
+ *	(9856 * ch1 / gain1 / mt / (25600 * ch0 / gain0 / mt) + 0.66505)
+ * =>	13.118336 * ch1 / (gain1 * mt)
+ *	+ 22.66064768 * ch0 / (gain0 * mt)
+ *	+ 8931.90144 * ch1 * ch1 * gain0 /
+ *	  (25600 * ch0 * gain1 * gain1 * mt)
+ *	+ 0.602694912 * ch1 / (gain1 * mt)
+ *
+ * =>	[0.3489024 * ch1 * ch1 * gain0 / (ch0 * gain1 * gain1)
+ *	 + 22.66064768 * ch0 / gain0
+ *	 + 13.721030912 * ch1 / gain1
+ *	] / mt
+ *
+ * For (D1/D0 >= 1.00)
+ *
+ * lx	= (0.001331* D0 + 0.0000354 * D1) * ((D1/D0 – 2.0) * (-0.05) + 1)
+ *	=> (0.001331* D0 + 0.0000354 * D1) * (-0.05D1/D0 + 1.1)
+ *	=> (0.001331 * 256 * 100 * ch0 / gain0 / mt + 0.0000354 * 256 *
+ *	   100 * ch1 / gain1 / mt) * (-0.05D1/D0 + 1.1)
+ *	=> (34.0736 * ch0 / gain0 / mt + 0.90624 * ch1 / gain1 / mt) *
+ *	   (-0.05 * 256 * 100 * ch1 / gain1 / mt / (256 * 100 * ch0 / gain0 / mt) + 1.1)
+ *	=> (34.0736 * ch0 / gain0 / mt + 0.90624 * ch1 / gain1 / mt) *
+ *	   (-1280 * ch1 / (gain1 * mt * 25600 * ch0 / gain0 / mt) + 1.1)
+ *	=> (34.0736 * ch0 * -1280 * ch1 * gain0 * mt /( gain0 * mt * gain1 * mt * 25600 * ch0)
+ *	    + 34.0736 * 1.1 * ch0 / (gain0 * mt)
+ *	    + 0.90624 * ch1 * -1280 * ch1 *gain0 * mt / (gain1 * mt *gain1 * mt * 25600 * ch0)
+ *	    + 1.1 * 0.90624 * ch1 / (gain1 * mt)
+ *	=> -43614.208 * ch1 / (gain1 * mt * 25600)
+ *	    + 37.48096  ch0 / (gain0 * mt)
+ *	    - 1159.9872 * ch1 * ch1 * gain0 / (gain1 * gain1 * mt * 25600 * ch0)
+ *	    + 0.996864 ch1 / (gain1 * mt)
+ *	=> [
+ *		- 0.045312 * ch1 * ch1 * gain0 / (gain1 * gain1 * ch0)
+ *		- 0.706816 * ch1 / gain1
+ *		+ 37.48096  ch0 /gain0
+ *	   ] * mt
+ *
+ *
+ * So, the first case (D1/D0 < 0.87) can be computed to a form:
+ *
+ * lx = (3.126528 * ch1 * ch1 * gain0 / (ch0 * gain1 * gain1) +
+ *	 115.7400832 * ch1 / gain1 +
+ *	-68.1982976 * ch0 / gain0
+ *	 / mt
+ *
+ * Second case (0.87 <= D1/D0 < 1.00) goes to form:
+ *
+ *	=> [0.3489024 * ch1 * ch1 * gain0 / (ch0 * gain1 * gain1) +
+ *	    13.721030912 * ch1 / gain1 +
+ *	    22.66064768 * ch0 / gain0
+ *	   ] / mt
+ *
+ * Third case (D1/D0 >= 1.00) goes to form:
+ *	=> [-0.045312 * ch1 * ch1 * gain0 / (ch0 * gain1 * gain1) +
+ *	    -0.706816 * ch1 / gain1 +
+ *	    37.48096  ch0 /(gain0
+ *	   ] / mt
+ *
+ * This can be unified to format:
+ * lx = [
+ *	 A * ch1 * ch1 * gain0 / (ch0 * gain1 * gain1) +
+ *	 B * ch1 / gain1 +
+ *	 C * ch0 / gain0
+ *	] / mt
+ *
+ * For case 1:
+ * A = 3.126528,
+ * B = 115.7400832
+ * C = -68.1982976
+ *
+ * For case 2:
+ * A = 0.3489024
+ * B = 13.721030912
+ * C = 22.66064768
+ *
+ * For case 3:
+ * A = -0.045312
+ * B = -0.706816
+ * C = 37.48096
+ */
+
+struct bu27034_lx_coeff {
+	unsigned int A;
+	unsigned int B;
+	unsigned int C;
+	/* Indicate which of the coefficients above are negative */
+	bool is_neg[3];
+};
+
+static inline u64 gain_mul_div_helper(u64 val, unsigned int gain,
+				      unsigned int div)
+{
+	/*
+	 * Max gain for a channel is 4096. The max u64 (0xffffffffffffffffULL)
+	 * divided by 4096 is 0xFFFFFFFFFFFFF (GENMASK_ULL(51, 0)) (floored).
+	 * Thus, the 0xFFFFFFFFFFFFF is the largest value we can safely multiply
+	 * with the gain, no matter what gain is set.
+	 *
+	 * So, multiplication with max gain may overflow if val is greater than
+	 * 0xFFFFFFFFFFFFF (52 bits set)..
+	 *
+	 * If this is the case we divide first.
+	 */
+	if (val < GENMASK_ULL(51, 0)) {
+		val *= gain;
+		do_div(val, div);
+	} else {
+		do_div(val, div);
+		val *= gain;
+	}
+
+	return val;
+}
+
+static u64 bu27034_fixp_calc_t1_64bit(unsigned int coeff, unsigned int ch0,
+				      unsigned int ch1, unsigned int gain0,
+				      unsigned int gain1)
+{
+	unsigned int helper;
+	u64 helper64;
+
+	helper64 = (u64)coeff * (u64)ch1 * (u64)ch1;
+
+	helper = gain1 * gain1;
+	if (helper > ch0) {
+		do_div(helper64, helper);
+
+		return gain_mul_div_helper(helper64, gain0, ch0);
+	}
+
+	do_div(helper64, ch0);
+
+	return gain_mul_div_helper(helper64, gain0, helper);
+
+}
+
+static u64 bu27034_fixp_calc_t1(unsigned int coeff, unsigned int ch0,
+				unsigned int ch1, unsigned int gain0,
+				unsigned int gain1)
+{
+	unsigned int helper, tmp;
+
+	/*
+	 * Here we could overflow even the 64bit value. Hence we
+	 * multiply with gain0 only after the divisions - even though
+	 * it may result loss of accuracy
+	 */
+	helper = coeff * ch1 * ch1;
+	tmp = helper * gain0;
+
+	helper = ch1 * ch1;
+
+	if (check_mul_overflow(helper, coeff, &helper))
+		return bu27034_fixp_calc_t1_64bit(coeff, ch0, ch1, gain0, gain1);
+
+	if (check_mul_overflow(helper, gain0, &tmp))
+		return bu27034_fixp_calc_t1_64bit(coeff, ch0, ch1, gain0, gain1);
+
+	return tmp / (gain1 * gain1) / ch0;
+
+}
+
+static u64 bu27034_fixp_calc_t23(unsigned int coeff, unsigned int ch,
+				 unsigned int gain)
+{
+	unsigned int helper;
+	u64 helper64;
+
+	if (!check_mul_overflow(coeff, ch, &helper))
+		return helper / gain;
+
+	helper64 = (u64)coeff * (u64)ch;
+	do_div(helper64, gain);
+
+	return helper64;
+}
+
+static int bu27034_fixp_calc_lx(unsigned int ch0, unsigned int ch1,
+				unsigned int gain0, unsigned int gain1,
+				unsigned int meastime, int coeff_idx)
+{
+	static const struct bu27034_lx_coeff coeff[] = {
+		{
+			.A = 31265280,		/* 3.126528 */
+			.B = 1157400832,	/*115.7400832 */
+			.C = 681982976,		/* -68.1982976 */
+			.is_neg = {false, false, true},
+		}, {
+			.A = 3489024,		/* 0.3489024 */
+			.B = 137210309,		/* 13.721030912 */
+			.C = 226606476,		/* 22.66064768 */
+			/* All terms positive */
+		}, {
+			.A = 453120,		/* -0.045312 */
+			.B = 7068160,		/* -0.706816 */
+			.C = 374809600,		/* 37.48096 */
+			.is_neg = {true, true, false},
+		}
+	};
+	const struct bu27034_lx_coeff *c = &coeff[coeff_idx];
+	u64 res = 0, terms[3];
+	int i;
+
+	if (coeff_idx >= ARRAY_SIZE(coeff))
+		return -EINVAL;
+
+	terms[0] = bu27034_fixp_calc_t1(c->A, ch0, ch1, gain0, gain1);
+	terms[1] = bu27034_fixp_calc_t23(c->B, ch1, gain1);
+	terms[2] = bu27034_fixp_calc_t23(c->C, ch0, gain0);
+
+	/* First, add positive terms */
+	for (i = 0; i < 3; i++)
+		if (!c->is_neg[i])
+			res += terms[i];
+
+	/* No positive term => zero lux */
+	if (!res)
+		return 0;
+
+	/* Then, subtract negative terms (if any) */
+	for (i = 0; i < 3; i++)
+		if (c->is_neg[i]) {
+			/*
+			 * If the negative term is greater than positive - then
+			 * the darkness has taken over and we are all doomed! Eh,
+			 * I mean, then we can just return 0 lx and go out
+			 */
+			if (terms[i] >= res)
+				return 0;
+
+			res -= terms[i];
+		}
+
+	meastime *= 10;
+	do_div(res, meastime);
+
+	return (int) res;
+}
+
+static bool bu27034_has_valid_sample(struct bu27034_data *data)
+{
+	int ret, val;
+
+	ret = regmap_read(data->regmap, BU27034_REG_MODE_CONTROL4, &val);
+	if (ret) {
+		dev_err(data->dev, "Read failed %d\n", ret);
+
+		return false;
+	}
+
+	return val & BU27034_MASK_VALID;
+}
+
+/*
+ * Reading the register where VALID bit is clears this bit. (So does changing
+ * any gain / integration time configuration registers) The bit gets
+ * set when we have acquired new data. We use this bit to indicate data
+ * validity.
+ */
+static void bu27034_invalidate_read_data(struct bu27034_data *data)
+{
+	bu27034_has_valid_sample(data);
+}
+
+static int bu27034_read_result(struct bu27034_data *data, int chan, int *res)
+{
+	int reg[] = {
+		[BU27034_CHAN_DATA0] = BU27034_REG_DATA0_LO,
+		[BU27034_CHAN_DATA1] = BU27034_REG_DATA1_LO,
+		[BU27034_CHAN_DATA2] = BU27034_REG_DATA2_LO,
+	};
+	int valid, ret;
+	__le16 val;
+
+	ret = regmap_read_poll_timeout(data->regmap, BU27034_REG_MODE_CONTROL4,
+				       valid, (valid & BU27034_MASK_VALID),
+				       BU27034_DATA_WAIT_TIME_US, 0);
+	if (ret)
+		return ret;
+
+	ret = regmap_bulk_read(data->regmap, reg[chan], &val, sizeof(val));
+	if (ret)
+		return ret;
+
+	*res = le16_to_cpu(val);
+
+	return 0;
+}
+
+static int bu27034_get_result_unlocked(struct bu27034_data *data, __le16 *res,
+				       int size)
+{
+	int ret = 0, retry_cnt = 0;
+
+retry:
+	/* Get new value from sensor if data is ready */
+	if (bu27034_has_valid_sample(data)) {
+		ret = regmap_bulk_read(data->regmap, BU27034_REG_DATA0_LO,
+				       res, size);
+		if (ret)
+			return ret;
+
+		bu27034_invalidate_read_data(data);
+	} else {
+		/* No new data in sensor. Wait and retry */
+		retry_cnt++;
+
+		if (retry_cnt > BU27034_RETRY_LIMIT) {
+			dev_err(data->dev, "No data from sensor\n");
+
+			return -ETIMEDOUT;
+		}
+
+		msleep(25);
+
+		goto retry;
+	}
+
+	return ret;
+}
+
+static int bu27034_meas_set(struct bu27034_data *data, bool en)
+{
+	if (en)
+		return regmap_set_bits(data->regmap, BU27034_REG_MODE_CONTROL4,
+				       BU27034_MASK_MEAS_EN);
+
+	return regmap_clear_bits(data->regmap, BU27034_REG_MODE_CONTROL4,
+				 BU27034_MASK_MEAS_EN);
+}
+
+static int bu27034_get_single_result(struct bu27034_data *data, int chan,
+				     int *val)
+{
+	int ret;
+
+	if (chan < BU27034_CHAN_DATA0 || chan > BU27034_CHAN_DATA2)
+		return -EINVAL;
+
+	ret = bu27034_meas_set(data, true);
+	if (ret)
+		return ret;
+
+	ret = bu27034_get_int_time(data);
+	if (ret < 0)
+		return ret;
+
+	msleep(ret / 1000);
+
+	return bu27034_read_result(data, chan, val);
+}
+
+/*
+ * The formula given by vendor for computing luxes out of data0 and data1
+ * (in open air) is as follows:
+ *
+ * Let's mark:
+ * D0 = data0/ch0_gain/meas_time_ms * 25600
+ * D1 = data1/ch1_gain/meas_time_ms * 25600
+ *
+ * Then:
+ * if (D1/D0 < 0.87)
+ *	lx = (0.001331 * D0 + 0.0000354 * D1) * ((D1 / D0 - 0.87) * 3.45 + 1)
+ * else if (D1/D0 < 1)
+ *	lx = (0.001331 * D0 + 0.0000354 * D1) * ((D1 / D0 - 0.87) * 0.385 + 1)
+ * else
+ *	lx = (0.001331 * D0 + 0.0000354 * D1) * ((D1 / D0 - 2) * -0.05 + 1)
+ *
+ * We use it here. Users who have for example some colored lens
+ * need to modify the calculation but I hope this gives a starting point for
+ * those working with such devices.
+ */
+
+static int bu27034_calc_mlux(struct bu27034_data *data, __le16 *res, int *val)
+{
+	unsigned int gain0, gain1, meastime;
+	unsigned int d1_d0_ratio_scaled;
+	u16 ch0, ch1;
+	u64 helper64;
+	int ret;
+
+	/*
+	 * We return 0 lux if calculation fails. This should be reasonably
+	 * easy to spot from the buffers especially if raw-data channels show
+	 * valid values
+	 */
+	*val = 0;
+
+	ch0 = max_t(u16, 1, le16_to_cpu(res[0]));
+	ch1 = max_t(u16, 1, le16_to_cpu(res[1]));
+
+	ret = bu27034_get_gain(data, BU27034_CHAN_DATA0, &gain0);
+	if (ret)
+		return ret;
+
+	ret = bu27034_get_gain(data, BU27034_CHAN_DATA1, &gain1);
+	if (ret)
+		return ret;
+
+	ret = bu27034_get_int_time(data);
+	if (ret < 0)
+		return ret;
+
+	meastime = ret;
+
+	d1_d0_ratio_scaled = (unsigned int)ch1 * (unsigned int)gain0 * 100;
+	helper64 = (u64)ch1 * (u64)gain0 * 100LLU;
+
+	if (helper64 != d1_d0_ratio_scaled) {
+		unsigned int div = (unsigned int)ch0 * gain1;
+
+		do_div(helper64, div);
+		d1_d0_ratio_scaled = helper64;
+	} else {
+		d1_d0_ratio_scaled /= ch0 * gain1;
+	}
+
+	if (d1_d0_ratio_scaled < 87)
+		ret = bu27034_fixp_calc_lx(ch0, ch1, gain0, gain1, meastime, 0);
+	else if (d1_d0_ratio_scaled < 100)
+		ret = bu27034_fixp_calc_lx(ch0, ch1, gain0, gain1, meastime, 1);
+	else
+		ret = bu27034_fixp_calc_lx(ch0, ch1, gain0, gain1, meastime, 2);
+
+	if (ret < 0)
+		return ret;
+
+	*val = ret;
+
+	return 0;
+
+}
+
+static int bu27034_get_mlux(struct bu27034_data *data, int chan, int *val)
+{
+	__le16 res[3];
+	int ret;
+
+	ret = bu27034_meas_set(data, true);
+	if (ret)
+		return ret;
+
+	ret = bu27034_get_result_unlocked(data, &res[0], sizeof(res));
+	if (ret)
+		return ret;
+
+	ret = bu27034_calc_mlux(data, res, val);
+	if (ret)
+		return ret;
+
+	ret = bu27034_meas_set(data, false);
+	if (ret)
+		dev_err(data->dev, "failed to disable measurement\n");
+
+	return 0;
+}
+
+static int bu27034_read_raw(struct iio_dev *idev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long mask)
+{
+	struct bu27034_data *data = iio_priv(idev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_INT_TIME:
+		*val = bu27034_get_int_time(data);
+		if (*val < 0)
+			return *val;
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		return bu27034_get_scale(data, chan->channel, val, val2);
+
+	case IIO_CHAN_INFO_RAW:
+	{
+		int (*result_get)(struct bu27034_data *data, int chan, int *val);
+
+		if (chan->type == IIO_INTENSITY)
+			result_get = bu27034_get_single_result;
+		else if (chan->type == IIO_LIGHT)
+			result_get = bu27034_get_mlux;
+		else
+			return -EINVAL;
+
+		/* Don't mess with measurement enabling while buffering */
+		ret = iio_device_claim_direct_mode(idev);
+		if (ret)
+			return ret;
+
+		mutex_lock(&data->mutex);
+		/*
+		 * Reading one channel at a time is inefficient but we
+		 * don't care here. Buffered version should be used if
+		 * performance is an issue.
+		 */
+		ret = result_get(data, chan->channel, val);
+
+		mutex_unlock(&data->mutex);
+		iio_device_release_direct_mode(idev);
+
+		if (ret)
+			return ret;
+
+		return IIO_VAL_INT;
+	}
+	default:
+		return -EINVAL;
+	}
+}
+
+static int bu27034_write_raw(struct iio_dev *idev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	struct bu27034_data *data = iio_priv(idev);
+	int ret;
+
+	ret = iio_device_claim_direct_mode(idev);
+	if (ret)
+		return ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		ret = bu27034_set_scale(data, chan->channel, val, val2);
+		break;
+	case IIO_CHAN_INFO_INT_TIME:
+		ret = bu27034_try_set_int_time(data, val);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	iio_device_release_direct_mode(idev);
+
+	return ret;
+}
+
+static int bu27034_read_avail(struct iio_dev *idev,
+			      struct iio_chan_spec const *chan, const int **vals,
+			      int *type, int *length, long mask)
+{
+	struct bu27034_data *data = iio_priv(idev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_INT_TIME:
+		return iio_gts_avail_times(&data->gts, vals, type, length);
+	case IIO_CHAN_INFO_SCALE:
+		return iio_gts_all_avail_scales(&data->gts, vals, type, length);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info bu27034_info = {
+	.read_raw = &bu27034_read_raw,
+	.write_raw = &bu27034_write_raw,
+	.read_avail = &bu27034_read_avail,
+};
+
+static int bu27034_chip_init(struct bu27034_data *data)
+{
+	int ret, sel;
+
+	/* Reset */
+	ret = regmap_update_bits(data->regmap, BU27034_REG_SYSTEM_CONTROL,
+			   BU27034_MASK_SW_RESET, BU27034_MASK_SW_RESET);
+	if (ret)
+		return dev_err_probe(data->dev, ret, "Sensor reset failed\n");
+
+	msleep(1);
+	/*
+	 * Read integration time here to ensure it is in regmap cache. We do
+	 * this to speed-up the int-time acquisition in the start of the buffer
+	 * handling thread where longer delays could make it more likely we end
+	 * up skipping a sample, and where the longer delays make timestamps
+	 * less accurate.
+	 */
+	ret = regmap_read(data->regmap, BU27034_REG_MODE_CONTROL1, &sel);
+	if (ret)
+		dev_err(data->dev, "reading integration time failed\n");
+
+	return 0;
+}
+
+static int bu27034_wait_for_data(struct bu27034_data *data)
+{
+	int ret, val;
+
+	ret = regmap_read_poll_timeout(data->regmap, BU27034_REG_MODE_CONTROL4,
+				       val, val & BU27034_MASK_VALID,
+				       BU27034_DATA_WAIT_TIME_US,
+				       BU27034_TOTAL_DATA_WAIT_TIME_US);
+	if (ret) {
+		dev_err(data->dev, "data polling %s\n",
+			!(val & BU27034_MASK_VALID) ? "timeout" : "fail");
+
+		return ret;
+	}
+
+	ret = regmap_bulk_read(data->regmap, BU27034_REG_DATA0_LO,
+			       &data->scan.channels[0],
+			       sizeof(data->scan.channels));
+	if (ret)
+		return ret;
+
+	bu27034_invalidate_read_data(data);
+
+	return 0;
+}
+
+static int bu27034_buffer_thread(void *arg)
+{
+	struct iio_dev *idev = arg;
+	struct bu27034_data *data;
+	int wait_ms;
+
+	data = iio_priv(idev);
+
+	wait_ms = bu27034_get_int_time(data);
+	wait_ms /= 1000;
+
+	wait_ms -= BU27034_MEAS_WAIT_PREMATURE_MS;
+
+	while (!kthread_should_stop()) {
+		int ret;
+		int64_t tstamp;
+
+		msleep(wait_ms);
+		ret = bu27034_wait_for_data(data);
+		if (ret)
+			continue;
+
+		tstamp = iio_get_time_ns(idev);
+
+		if (test_bit(BU27034_CHAN_ALS, idev->active_scan_mask)) {
+			int mlux;
+
+			ret = bu27034_calc_mlux(data, &data->scan.channels[0],
+					       &mlux);
+			if (ret)
+				dev_err(data->dev, "failed to calculate lux\n");
+
+			/*
+			 * The maximum Milli lux value we get with gain 1x time
+			 * 55mS data ch0 = 0xffff ch1 = 0xffff fits in 26 bits
+			 * so there should be no problem returning int from
+			 * computations and casting it to u32
+			 */
+			data->scan.mlux = (u32)mlux;
+		}
+		iio_push_to_buffers_with_timestamp(idev, &data->scan, tstamp);
+	}
+
+	return 0;
+}
+
+static int bu27034_buffer_enable(struct iio_dev *idev)
+{
+	struct bu27034_data *data = iio_priv(idev);
+	struct task_struct *task;
+	int ret;
+
+	mutex_lock(&data->mutex);
+	ret = bu27034_meas_set(data, true);
+	if (ret)
+		goto unlock_out;
+
+	task = kthread_run(bu27034_buffer_thread, idev,
+				 "bu27034-buffering-%u",
+				 iio_device_id(idev));
+	if (IS_ERR(task)) {
+		ret = PTR_ERR(task);
+		goto unlock_out;
+	}
+
+	data->task = task;
+
+unlock_out:
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static int bu27034_buffer_disable(struct iio_dev *idev)
+{
+	struct bu27034_data *data = iio_priv(idev);
+	int ret;
+
+	mutex_lock(&data->mutex);
+	if (data->task) {
+		kthread_stop(data->task);
+		data->task = NULL;
+	}
+
+	ret = bu27034_meas_set(data, false);
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static const struct iio_buffer_setup_ops bu27034_buffer_ops = {
+	.postenable = &bu27034_buffer_enable,
+	.predisable = &bu27034_buffer_disable,
+};
+
+static int bu27034_probe(struct i2c_client *i2c)
+{
+	struct device *dev = &i2c->dev;
+	struct bu27034_data *data;
+	struct regmap *regmap;
+	struct iio_dev *idev;
+	unsigned int part_id, reg;
+	int ret;
+
+	regmap = devm_regmap_init_i2c(i2c, &bu27034_regmap);
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap),
+				     "Failed to initialize Regmap\n");
+
+	idev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!idev)
+		return -ENOMEM;
+
+	ret = devm_regulator_get_enable(dev, "vdd");
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get regulator\n");
+
+	data = iio_priv(idev);
+
+	ret = regmap_read(regmap, BU27034_REG_SYSTEM_CONTROL, &reg);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to access sensor\n");
+
+	part_id = FIELD_GET(BU27034_MASK_PART_ID, reg);
+
+	if (part_id != BU27034_ID)
+		dev_warn(dev, "unknown device 0x%x\n", part_id);
+
+	ret = devm_iio_init_iio_gts(dev, BU27034_SCALE_1X, 0, bu27034_gains,
+				    ARRAY_SIZE(bu27034_gains), bu27034_itimes,
+				    ARRAY_SIZE(bu27034_itimes), &data->gts);
+	if (ret)
+		return ret;
+
+	mutex_init(&data->mutex);
+	data->regmap = regmap;
+	data->dev = dev;
+
+	idev->channels = bu27034_channels;
+	idev->num_channels = ARRAY_SIZE(bu27034_channels);
+	idev->name = "bu27034";
+	idev->info = &bu27034_info;
+
+	idev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
+	idev->available_scan_masks = bu27034_scan_masks;
+
+	ret = bu27034_chip_init(data);
+	if (ret)
+		return ret;
+
+	ret = devm_iio_kfifo_buffer_setup(dev, idev, &bu27034_buffer_ops);
+	if (ret)
+		return dev_err_probe(dev, ret, "buffer setup failed\n");
+
+	ret = devm_iio_device_register(dev, idev);
+	if (ret < 0)
+		return dev_err_probe(dev, ret,
+				     "Unable to register iio device\n");
+
+	return ret;
+}
+
+static const struct of_device_id bu27034_of_match[] = {
+	{ .compatible = "rohm,bu27034" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bu27034_of_match);
+
+static struct i2c_driver bu27034_i2c_driver = {
+	.driver = {
+		.name = "bu27034-als",
+		.of_match_table = bu27034_of_match,
+	},
+	.probe_new = bu27034_probe,
+};
+module_i2c_driver(bu27034_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Matti Vaittinen <[e-mail]>");
+MODULE_DESCRIPTION("ROHM BU27034 ambient light sensor driver");
+MODULE_IMPORT_NS(IIO_GTS_HELPER);

drivers/iio/light/rpr0521.c

···
 	struct rpr0521_data *data = iio_priv(indio_dev);
 
 	if (rpr0521_is_triggered(data)) {
-		iio_trigger_poll_chained(data->drdy_trigger0);
+		iio_trigger_poll_nested(data->drdy_trigger0);
 		return IRQ_HANDLED;
 	}
 

drivers/iio/light/st_uvis25_core.c

···
 	if (!(status & ST_UVIS25_REG_UV_DA_MASK))
 		return IRQ_NONE;
 
-	iio_trigger_poll_chained(hw->trig);
+	iio_trigger_poll_nested(hw->trig);
 
 	return IRQ_HANDLED;
 }

drivers/iio/light/vcnl4000.c

···
 	}
 
 	if (isr & VCNL4010_INT_DRDY && iio_buffer_enabled(indio_dev))
-		iio_trigger_poll_chained(indio_dev->trig);
+		iio_trigger_poll_nested(indio_dev->trig);
 
 end:
 	return IRQ_HANDLED;

drivers/iio/light/vcnl4035.c

···
 							IIO_EV_TYPE_THRESH,
 							IIO_EV_DIR_EITHER),
 				iio_get_time_ns(indio_dev));
-		iio_trigger_poll_chained(data->drdy_trigger0);
+		iio_trigger_poll_nested(data->drdy_trigger0);
 		return IRQ_HANDLED;
 	}
 

drivers/iio/potentiostat/lmp91000.c

···
 
 	data->chan_select = channel != LMP91000_REG_MODECN_3LEAD;
 
-	iio_trigger_poll_chained(data->trig);
+	iio_trigger_poll_nested(data->trig);
 
 	ret = wait_for_completion_timeout(&data->completion, HZ);
 	reinit_completion(&data->completion);

drivers/iio/pressure/Kconfig

···
 	  will be called abp060mg.
 
 config BMP280
-	tristate "Bosch Sensortec BMP180/BMP280/BMP380 pressure sensor I2C driver"
+	tristate "Bosch Sensortec BMP180/BMP280/BMP380/BMP580 pressure sensor driver"
 	depends on (I2C || SPI_MASTER)
 	select REGMAP
 	select BMP280_I2C if (I2C)
 	select BMP280_SPI if (SPI_MASTER)
 	help
-	  Say yes here to build support for Bosch Sensortec BMP180, BMP280 and
-	  BMP380 pressure and temperature sensors. Also supports the BME280 with
+	  Say yes here to build support for Bosch Sensortec BMP180, BMP280, BMP380
+	  and BMP580 pressure and temperature sensors. Also supports the BME280 with
 	  an additional humidity sensor channel.
 
 	  To compile this driver as a module, choose M here: the core module

drivers/iio/pressure/bmp280-core.c

···
  * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp280-ds001.pdf
  * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf
  * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp388-ds001.pdf
+ * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp581-ds004.pdf
  *
  * Notice:
  * The link to the bmp180 datasheet points to an outdated version missing these changes:
···
 #include <linux/bitfield.h>
 #include <linux/device.h>
 #include <linux/module.h>
+#include <linux/nvmem-provider.h>
 #include <linux/regmap.h>
 #include <linux/delay.h>
 #include <linux/iio/iio.h>
···
  */
 enum { AC1, AC2, AC3, AC4, AC5, AC6, B1, B2, MB, MC, MD };
 
-struct bmp180_calib {
-	s16 AC1;
-	s16 AC2;
-	s16 AC3;
-	u16 AC4;
-	u16 AC5;
-	u16 AC6;
-	s16 B1;
-	s16 B2;
-	s16 MB;
-	s16 MC;
-	s16 MD;
-};
-
-/* See datasheet Section 4.2.2. */
-struct bmp280_calib {
-	u16 T1;
-	s16 T2;
-	s16 T3;
-	u16 P1;
-	s16 P2;
-	s16 P3;
-	s16 P4;
-	s16 P5;
-	s16 P6;
-	s16 P7;
-	s16 P8;
-	s16 P9;
-	u8  H1;
-	s16 H2;
-	u8  H3;
-	s16 H4;
-	s16 H5;
-	s8  H6;
-};
-
-/* See datasheet Section 3.11.1. */
-struct bmp380_calib {
-	u16 T1;
-	u16 T2;
-	s8  T3;
-	s16 P1;
-	s16 P2;
-	s8  P3;
-	s8  P4;
-	u16 P5;
-	u16 P6;
-	s8  P7;
-	s8  P8;
-	s16 P9;
-	s8  P10;
-	s8  P11;
-};
-
-static const char *const bmp280_supply_names[] = {
-	"vddd", "vdda"
-};
-
-#define BMP280_NUM_SUPPLIES ARRAY_SIZE(bmp280_supply_names)
 
 enum bmp380_odr {
 	BMP380_ODR_200HZ,
···
 	BMP380_ODR_0_0015HZ,
 };
 
-struct bmp280_data {
-	struct device *dev;
-	struct mutex lock;
-	struct regmap *regmap;
-	struct completion done;
-	bool use_eoc;
-	const struct bmp280_chip_info *chip_info;
-	union {
-		struct bmp180_calib bmp180;
-		struct bmp280_calib bmp280;
-		struct bmp380_calib bmp380;
-	} calib;
-	struct regulator_bulk_data supplies[BMP280_NUM_SUPPLIES];
-	unsigned int start_up_time; /* in microseconds */
-
-	/* log of base 2 of oversampling rate */
-	u8 oversampling_press;
-	u8 oversampling_temp;
-	u8 oversampling_humid;
-	u8 iir_filter_coeff;
-
-	/*
-	 * BMP380 devices introduce sampling frequency configuration. See
-	 * datasheet sections 3.3.3. and 4.3.19 for more details.
-	 *
-	 * BMx280 devices allowed indirect configuration of sampling frequency
-	 * changing the t_standby duration between measurements, as detailed on
-	 * section 3.6.3 of the datasheet.
-	 */
-	int sampling_freq;
-
-	/*
-	 * Carryover value from temperature conversion, used in pressure
-	 * calculation.
-	 */
-	s32 t_fine;
-
-	/*
-	 * DMA (thus cache coherency maintenance) may require the
-	 * transfer buffers to live in their own cache lines.
-	 */
-	union {
-		/* Sensor data buffer */
-		u8 buf[3];
-		/* Calibration data buffers */
-		__le16 bmp280_cal_buf[BMP280_CONTIGUOUS_CALIB_REGS / 2];
-		__be16 bmp180_cal_buf[BMP180_REG_CALIB_COUNT / 2];
-		u8 bmp380_cal_buf[BMP380_CALIB_REG_COUNT];
-		/* Miscellaneous, endianess-aware data buffers */
-		__le16 le16;
-		__be16 be16;
-	} __aligned(IIO_DMA_MINALIGN);
-};
-
-struct bmp280_chip_info {
-	unsigned int id_reg;
-
-	const struct iio_chan_spec *channels;
-	int num_channels;
-	unsigned int start_up_time;
-
-	const int *oversampling_temp_avail;
-	int num_oversampling_temp_avail;
-	int oversampling_temp_default;
-
-	const int *oversampling_press_avail;
-	int num_oversampling_press_avail;
-	int oversampling_press_default;
-
-	const int *oversampling_humid_avail;
-	int num_oversampling_humid_avail;
-	int oversampling_humid_default;
-
-	const int *iir_filter_coeffs_avail;
-	int num_iir_filter_coeffs_avail;
-	int iir_filter_coeff_default;
-
-	const int (*sampling_freq_avail)[2];
-	int num_sampling_freq_avail;
-	int sampling_freq_default;
-
-	int (*chip_config)(struct bmp280_data *);
-	int (*read_temp)(struct bmp280_data *, int *);
-	int (*read_press)(struct bmp280_data *, int *, int *);
-	int (*read_humid)(struct bmp280_data *, int *, int *);
-	int (*read_calib)(struct bmp280_data *);
+enum bmp580_odr {
+	BMP580_ODR_240HZ,
+	BMP580_ODR_218HZ,
+	BMP580_ODR_199HZ,
+	BMP580_ODR_179HZ,
+	BMP580_ODR_160HZ,
+	BMP580_ODR_149HZ,
+	BMP580_ODR_140HZ,
+	BMP580_ODR_129HZ,
+	BMP580_ODR_120HZ,
+	BMP580_ODR_110HZ,
+	BMP580_ODR_100HZ,
+	BMP580_ODR_89HZ,
+	BMP580_ODR_80HZ,
+	BMP580_ODR_70HZ,
+	BMP580_ODR_60HZ,
+	BMP580_ODR_50HZ,
+	BMP580_ODR_45HZ,
+	BMP580_ODR_40HZ,
+	BMP580_ODR_35HZ,
+	BMP580_ODR_30HZ,
+	BMP580_ODR_25HZ,
+	BMP580_ODR_20HZ,
+	BMP580_ODR_15HZ,
+	BMP580_ODR_10HZ,
+	BMP580_ODR_5HZ,
+	BMP580_ODR_4HZ,
+	BMP580_ODR_3HZ,
+	BMP580_ODR_2HZ,
+	BMP580_ODR_1HZ,
+	BMP580_ODR_0_5HZ,
+	BMP580_ODR_0_25HZ,
+	BMP580_ODR_0_125HZ,
 };
 
 /*
···
 }
 
 static int bmp280_read_temp(struct bmp280_data *data,
-			    int *val)
+			    int *val, int *val2)
 {
 	s32 adc_temp, comp_temp;
 	int ret;
···
 	int ret;
 
 	/* Read and compensate temperature so we get a reading of t_fine. */
-	ret = bmp280_read_temp(data, NULL);
+	ret = bmp280_read_temp(data, NULL, NULL);
 	if (ret < 0)
 		return ret;
 
···
 	int ret;
 
 	/* Read and compensate temperature so we get a reading of t_fine. */
-	ret = bmp280_read_temp(data, NULL);
+	ret = bmp280_read_temp(data, NULL, NULL);
 	if (ret < 0)
 		return ret;
 
···
 			ret = data->chip_info->read_press(data, val, val2);
 			break;
 		case IIO_TEMP:
-			ret = data->chip_info->read_temp(data, val);
+			ret = data->chip_info->read_temp(data, val, val2);
 			break;
 		default:
 			ret = -EINVAL;
···
 
 static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
 
-static const struct bmp280_chip_info bmp280_chip_info = {
+const struct bmp280_chip_info bmp280_chip_info = {
 	.id_reg = BMP280_REG_ID,
+	.chip_id = BMP280_CHIP_ID,
+	.regmap_config = &bmp280_regmap_config,
 	.start_up_time = 2000,
 	.channels = bmp280_channels,
 	.num_channels = 2,
···
 	.read_press = bmp280_read_press,
 	.read_calib = bmp280_read_calib,
 };
+EXPORT_SYMBOL_NS(bmp280_chip_info, IIO_BMP280);
 
 static int bme280_chip_config(struct bmp280_data *data)
 {
···
 	return bmp280_chip_config(data);
 }
 
-static const struct bmp280_chip_info bme280_chip_info = {
+const struct bmp280_chip_info bme280_chip_info = {
 	.id_reg = BMP280_REG_ID,
+	.chip_id = BME280_CHIP_ID,
+	.regmap_config = &bmp280_regmap_config,
 	.start_up_time = 2000,
 	.channels = bmp280_channels,
 	.num_channels = 3,
···
 	.read_humid = bmp280_read_humid,
 	.read_calib = bme280_read_calib,
 };
+EXPORT_SYMBOL_NS(bme280_chip_info, IIO_BMP280);
 
 /*
  * Helper function to send a command to BMP3XX sensors.
···
 	return comp_press;
 }
 
-static int bmp380_read_temp(struct bmp280_data *data, int *val)
+static int bmp380_read_temp(struct bmp280_data *data, int *val, int *val2)
 {
 	s32 comp_temp;
 	u32 adc_temp;
···
 	int ret;
 
 	/* Read and compensate for temperature so we get a reading of t_fine */
-	ret = bmp380_read_temp(data, NULL);
+	ret = bmp380_read_temp(data, NULL, NULL);
 	if (ret)
 		return ret;
 
···
 	[BMP380_ODR_0_003HZ]	= {0, 3052},
 	[BMP380_ODR_0_0015HZ]	= {0, 1526},
 };
+
+static int bmp380_preinit(struct bmp280_data *data)
+{
+	/* BMP3xx requires soft-reset as part of initialization */
+	return bmp380_cmd(data, BMP380_CMD_SOFT_RESET);
+}
 
 static int bmp380_chip_config(struct bmp280_data *data)
 {
···
 static const int bmp380_oversampling_avail[] = { 1, 2, 4, 8, 16, 32 };
 static const int bmp380_iir_filter_coeffs_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128};
 
-static const struct bmp280_chip_info bmp380_chip_info = {
+const struct bmp280_chip_info bmp380_chip_info = {
 	.id_reg = BMP380_REG_ID,
+	.chip_id = BMP380_CHIP_ID,
+	.regmap_config = &bmp380_regmap_config,
 	.start_up_time = 2000,
 	.channels = bmp380_channels,
 	.num_channels = 2,
···
 	.read_temp = bmp380_read_temp,
 	.read_press = bmp380_read_press,
 	.read_calib = bmp380_read_calib,
+	.preinit = bmp380_preinit,
 };
+EXPORT_SYMBOL_NS(bmp380_chip_info, IIO_BMP280);
+
+static int bmp580_soft_reset(struct bmp280_data *data)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_write(data->regmap, BMP580_REG_CMD, BMP580_CMD_SOFT_RESET);
+	if (ret) {
+		dev_err(data->dev, "failed to send reset command to device\n");
+		return ret;
+	}
+	usleep_range(2000, 2500);
+
+	/* Dummy read of chip_id */
+	ret = regmap_read(data->regmap, BMP580_REG_CHIP_ID, &reg);
+	if (ret) {
+		dev_err(data->dev, "failed to reestablish comms after reset\n");
+		return ret;
+	}
+
+	ret = regmap_read(data->regmap, BMP580_REG_INT_STATUS, &reg);
+	if (ret) {
+		dev_err(data->dev, "error reading interrupt status register\n");
+		return ret;
+	}
+	if (!(reg & BMP580_INT_STATUS_POR_MASK)) {
+		dev_err(data->dev, "error resetting sensor\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * bmp580_nvm_operation() - Helper function to commit NVM memory operations
+ * @data: sensor data struct
+ * @is_write: flag to signal write operation
+ */
+static int bmp580_nvm_operation(struct bmp280_data *data, bool is_write)
+{
+	unsigned long timeout, poll;
+	unsigned int reg;
+	int ret;
+
+	/* Check NVM ready flag */
+	ret = regmap_read(data->regmap, BMP580_REG_STATUS, &reg);
+	if (ret) {
+		dev_err(data->dev, "failed to check nvm status\n");
+		return ret;
+	}
+	if (!(reg & BMP580_STATUS_NVM_RDY_MASK)) {
+		dev_err(data->dev, "sensor's nvm is not ready\n");
+		return -EIO;
+	}
+
+	/* Start NVM operation sequence */
+	ret = regmap_write(data->regmap, BMP580_REG_CMD, BMP580_CMD_NVM_OP_SEQ_0);
+	if (ret) {
+		dev_err(data->dev, "failed to send nvm operation's first sequence\n");
+		return ret;
+	}
+	if (is_write) {
+		/* Send NVM write sequence */
+		ret = regmap_write(data->regmap, BMP580_REG_CMD,
+				   BMP580_CMD_NVM_WRITE_SEQ_1);
+		if (ret) {
+			dev_err(data->dev, "failed to send nvm write sequence\n");
+			return ret;
+		}
+		/* Datasheet says on 4.8.1.2 it takes approximately 10ms */
+		poll = 2000;
+		timeout = 12000;
+	} else {
+		/* Send NVM read sequence */
+		ret = regmap_write(data->regmap, BMP580_REG_CMD,
+				   BMP580_CMD_NVM_READ_SEQ_1);
+		if (ret) {
+			dev_err(data->dev, "failed to send nvm read sequence\n");
+			return ret;
+		}
+		/* Datasheet says on 4.8.1.1 it takes approximately 200us */
+		poll = 50;
+		timeout = 400;
+	}
+	if (ret) {
+		dev_err(data->dev, "failed to write command sequence\n");
+		return -EIO;
+	}
+
+	/* Wait until NVM is ready again */
+	ret = regmap_read_poll_timeout(data->regmap, BMP580_REG_STATUS, reg,
+				       (reg & BMP580_STATUS_NVM_RDY_MASK),
+				       poll, timeout);
+	if (ret) {
+		dev_err(data->dev, "error checking nvm operation status\n");
+		return ret;
+	}
+
+	/* Check NVM error flags */
+	if ((reg & BMP580_STATUS_NVM_ERR_MASK) || (reg & BMP580_STATUS_NVM_CMD_ERR_MASK)) {
+		dev_err(data->dev, "error processing nvm operation\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/*
+ * Contrary to previous sensors families, compensation algorithm is builtin.
+ * We are only required to read the register raw data and adapt the ranges
+ * for what is expected on IIO ABI.
+ */
+
+static int bmp580_read_temp(struct bmp280_data *data, int *val, int *val2)
+{
+	s32 raw_temp;
+	int ret;
+
+	ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB, data->buf,
+			       sizeof(data->buf));
+	if (ret) {
+		dev_err(data->dev, "failed to read temperature\n");
+		return ret;
+	}
+
+	raw_temp = get_unaligned_le24(data->buf);
+	if (raw_temp == BMP580_TEMP_SKIPPED) {
+		dev_err(data->dev, "reading temperature skipped\n");
+		return -EIO;
+	}
+
+	/*
+	 * Temperature is returned in Celsius degrees in fractional
+	 * form down 2^16. We reescale by x1000 to return milli Celsius
+	 * to respect IIO ABI.
+	 */
+	*val = raw_temp * 1000;
+	*val2 = 16;
+	return IIO_VAL_FRACTIONAL_LOG2;
+}
+
+static int bmp580_read_press(struct bmp280_data *data, int *val, int *val2)
+{
+	u32 raw_press;
+	int ret;
+
+	ret = regmap_bulk_read(data->regmap, BMP580_REG_PRESS_XLSB, data->buf,
+			       sizeof(data->buf));
+	if (ret) {
+		dev_err(data->dev, "failed to read pressure\n");
+		return ret;
+	}
+
+	raw_press = get_unaligned_le24(data->buf);
+	if (raw_press == BMP580_PRESS_SKIPPED) {
+		dev_err(data->dev, "reading pressure skipped\n");
+		return -EIO;
+	}
+	/*
+	 * Pressure is returned in Pascals in fractional form down 2^16.
+	 * We reescale /1000 to convert to kilopascal to respect IIO ABI.
+	 */
+	*val = raw_press;
+	*val2 = 64000; /* 2^6 * 1000 */
+	return IIO_VAL_FRACTIONAL;
+}
+
+static const int bmp580_odr_table[][2] = {
+	[BMP580_ODR_240HZ] =	{240, 0},
+	[BMP580_ODR_218HZ] =	{218, 0},
+	[BMP580_ODR_199HZ] =	{199, 0},
+	[BMP580_ODR_179HZ] =	{179, 0},
+	[BMP580_ODR_160HZ] =	{160, 0},
+	[BMP580_ODR_149HZ] =	{149, 0},
+	[BMP580_ODR_140HZ] =	{140, 0},
+	[BMP580_ODR_129HZ] =	{129, 0},
+	[BMP580_ODR_120HZ] =	{120, 0},
+	[BMP580_ODR_110HZ] =	{110, 0},
+	[BMP580_ODR_100HZ] =	{100, 0},
+	[BMP580_ODR_89HZ] =	{89, 0},
+	[BMP580_ODR_80HZ] =	{80, 0},
+	[BMP580_ODR_70HZ] =	{70, 0},
+	[BMP580_ODR_60HZ] =	{60, 0},
+	[BMP580_ODR_50HZ] =	{50, 0},
+	[BMP580_ODR_45HZ] =	{45, 0},
+	[BMP580_ODR_40HZ] =	{40, 0},
+	[BMP580_ODR_35HZ] =	{35, 0},
+	[BMP580_ODR_30HZ] =	{30, 0},
+	[BMP580_ODR_25HZ] =	{25, 0},
+	[BMP580_ODR_20HZ] =	{20, 0},
+	[BMP580_ODR_15HZ] =	{15, 0},
+	[BMP580_ODR_10HZ] =	{10, 0},
+	[BMP580_ODR_5HZ] =	{5, 0},
+	[BMP580_ODR_4HZ] =	{4, 0},
+	[BMP580_ODR_3HZ] =	{3, 0},
+	[BMP580_ODR_2HZ] =	{2, 0},
+	[BMP580_ODR_1HZ] =	{1, 0},
+	[BMP580_ODR_0_5HZ] =	{0, 500000},
+	[BMP580_ODR_0_25HZ] =	{0, 250000},
+	[BMP580_ODR_0_125HZ] =	{0, 125000},
+};
+
+static const int bmp580_nvmem_addrs[] = { 0x20, 0x21, 0x22 };
+
+static int bmp580_nvmem_read(void *priv, unsigned int offset, void *val,
+			     size_t bytes)
+{
+	struct bmp280_data *data = priv;
+	u16 *dst = val;
+	int ret, addr;
+
+	pm_runtime_get_sync(data->dev);
+	mutex_lock(&data->lock);
+
+	/* Set sensor in standby mode */
+	ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,
+				 BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,
+				 BMP580_ODR_DEEPSLEEP_DIS |
+				 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));
+	if (ret) {
+		dev_err(data->dev, "failed to change sensor to standby mode\n");
+		goto exit;
+	}
+	/* Wait standby transition time */
+	usleep_range(2500, 3000);
+
+	while (bytes >= sizeof(*dst)) {
+		addr = bmp580_nvmem_addrs[offset / sizeof(*dst)];
+
+		ret = regmap_write(data->regmap, BMP580_REG_NVM_ADDR,
+				   FIELD_PREP(BMP580_NVM_ROW_ADDR_MASK, addr));
+		if (ret) {
+			dev_err(data->dev, "error writing nvm address\n");
+			goto exit;
+		}
+
+		ret = bmp580_nvm_operation(data, false);
+		if (ret)
+			goto exit;
+
+		ret = regmap_bulk_read(data->regmap, BMP580_REG_NVM_DATA_LSB, &data->le16,
+				       sizeof(data->le16));
+		if (ret) {
+			dev_err(data->dev, "error reading nvm data regs\n");
+			goto exit;
+		}
+
+		*dst++ = le16_to_cpu(data->le16);
+		bytes -= sizeof(*dst);
+		offset += sizeof(*dst);
+	}
+exit:
+	/* Restore chip config */
+	data->chip_info->chip_config(data);
+	mutex_unlock(&data->lock);
+	pm_runtime_mark_last_busy(data->dev);
+	pm_runtime_put_autosuspend(data->dev);
+	return ret;
+}
+
+static int bmp580_nvmem_write(void *priv, unsigned int offset, void *val,
+			      size_t bytes)
+{
+	struct bmp280_data *data = priv;
+	u16 *buf = val;
+	int ret, addr;
+
+	pm_runtime_get_sync(data->dev);
+	mutex_lock(&data->lock);
+
+	/* Set sensor in standby mode */
+	ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,
+				 BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,
+				 BMP580_ODR_DEEPSLEEP_DIS |
+				 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));
+	if (ret) {
+		dev_err(data->dev, "failed to change sensor to standby mode\n");
+		goto exit;
+	}
+	/* Wait standby transition time */
+	usleep_range(2500, 3000);
+
+	while (bytes >= sizeof(*buf)) {
+		addr = bmp580_nvmem_addrs[offset / sizeof(*buf)];
+
+		ret = regmap_write(data->regmap, BMP580_REG_NVM_ADDR, BMP580_NVM_PROG_EN |
+				   FIELD_PREP(BMP580_NVM_ROW_ADDR_MASK, addr));
+		if (ret) {
+			dev_err(data->dev, "error writing nvm address\n");
+			goto exit;
+		}
+		data->le16 = cpu_to_le16(*buf++);
+
+		ret = regmap_bulk_write(data->regmap, BMP580_REG_NVM_DATA_LSB, &data->le16,
+					sizeof(data->le16));
+		if (ret) {
+			dev_err(data->dev, "error writing LSB NVM data regs\n");
+			goto exit;
+		}
+
+		ret = bmp580_nvm_operation(data, true);
+		if (ret)
+			goto exit;
+
+		/* Disable programming mode bit */
+		ret = regmap_update_bits(data->regmap, BMP580_REG_NVM_ADDR,
+					 BMP580_NVM_PROG_EN, 0);
+		if (ret) {
+			dev_err(data->dev, "error resetting nvm write\n");
+			goto exit;
+		}
+
+		bytes -= sizeof(*buf);
+		offset += sizeof(*buf);
+	}
+exit:
+	/* Restore chip config */
+	data->chip_info->chip_config(data);
+	mutex_unlock(&data->lock);
+	pm_runtime_mark_last_busy(data->dev);
+	pm_runtime_put_autosuspend(data->dev);
+	return ret;
+}
+
+static int bmp580_preinit(struct bmp280_data *data)
+{
+	struct nvmem_config config = {
+		.dev = data->dev,
+		.priv = data,
+		.name = "bmp580_nvmem",
+		.word_size = sizeof(u16),
+		.stride = sizeof(u16),
+		.size = 3 * sizeof(u16),
+		.reg_read = bmp580_nvmem_read,
+		.reg_write = bmp580_nvmem_write,
+	};
+	unsigned int reg;
+	int ret;
+
+	/* Issue soft-reset command */
+	ret = bmp580_soft_reset(data);
+	if (ret)
+		return ret;
+
+	/* Post powerup sequence */
+	ret = regmap_read(data->regmap, BMP580_REG_CHIP_ID, &reg);
+	if (ret)
+		return ret;
+
+	/* Print warn message if we don't know the chip id */
+	if (reg != BMP580_CHIP_ID && reg != BMP580_CHIP_ID_ALT)
+		dev_warn(data->dev, "preinit: unexpected chip_id\n");
+
+	ret = regmap_read(data->regmap, BMP580_REG_STATUS, &reg);
+	if (ret)
+		return ret;
+
+	/* Check nvm status */
+	if (!(reg & BMP580_STATUS_NVM_RDY_MASK) || (reg & BMP580_STATUS_NVM_ERR_MASK)) {
+		dev_err(data->dev, "preinit: nvm error on powerup sequence\n");
+		return -EIO;
+	}
+
+	/* Register nvmem device */
+	return PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, &config));
+}
+
+static int bmp580_chip_config(struct bmp280_data *data)
+{
+	bool change = false, aux;
+	unsigned int tmp;
+	u8 reg_val;
+	int ret;
+
+	/* Sets sensor in standby mode */
+	ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,
+				 BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,
+				 BMP580_ODR_DEEPSLEEP_DIS |
+				 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));
+	if (ret) {
+		dev_err(data->dev, "failed to change sensor to standby mode\n");
+		return ret;
+	}
+	/* From datasheet's table 4: electrical characteristics */
+	usleep_range(2500, 3000);
+
+	/* Set default DSP mode settings */
+	reg_val = FIELD_PREP(BMP580_DSP_COMP_MASK, BMP580_DSP_PRESS_TEMP_COMP_EN) |
+		  BMP580_DSP_SHDW_IIR_TEMP_EN | BMP580_DSP_SHDW_IIR_PRESS_EN;
+
+	ret = regmap_update_bits(data->regmap, BMP580_REG_DSP_CONFIG,
+				 BMP580_DSP_COMP_MASK |
+				 BMP580_DSP_SHDW_IIR_TEMP_EN |
+				 BMP580_DSP_SHDW_IIR_PRESS_EN, reg_val);
+
+	/* Configure oversampling */
+	reg_val = FIELD_PREP(BMP580_OSR_TEMP_MASK, data->oversampling_temp) |
+		  FIELD_PREP(BMP580_OSR_PRESS_MASK, data->oversampling_press) |
+		  BMP580_OSR_PRESS_EN;
+
+	ret = regmap_update_bits_check(data->regmap, BMP580_REG_OSR_CONFIG,
+				       BMP580_OSR_TEMP_MASK | BMP580_OSR_PRESS_MASK |
+				       BMP580_OSR_PRESS_EN,
+				       reg_val, &aux);
+	if (ret) {
+		dev_err(data->dev, "failed to write oversampling register\n");
+		return ret;
+	}
+	change = change || aux;
+
+	/* Configure output data rate */
+	ret = regmap_update_bits_check(data->regmap, BMP580_REG_ODR_CONFIG, BMP580_ODR_MASK,
+				       FIELD_PREP(BMP580_ODR_MASK, data->sampling_freq),
+				       &aux);
+	if (ret) {
+		dev_err(data->dev, "failed to write ODR configuration register\n");
+		return ret;
+	}
+	change = change || aux;
+
+	/* Set filter data */
+	reg_val = FIELD_PREP(BMP580_DSP_IIR_PRESS_MASK, data->iir_filter_coeff) |
+		  FIELD_PREP(BMP580_DSP_IIR_TEMP_MASK, data->iir_filter_coeff);
+
+	ret = regmap_update_bits_check(data->regmap, BMP580_REG_DSP_IIR,
+				       BMP580_DSP_IIR_PRESS_MASK |
+				       BMP580_DSP_IIR_TEMP_MASK,
+				       reg_val, &aux);
+	if (ret) {
+		dev_err(data->dev, "failed to write config register\n");
+		return ret;
+	}
+	change = change || aux;
+
+	/* Restore sensor to normal operation mode */
+	ret = regmap_write_bits(data->regmap, BMP580_REG_ODR_CONFIG,
+				BMP580_MODE_MASK,
+				FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_NORMAL));
+	if (ret) {
+		dev_err(data->dev, "failed to set normal mode\n");
+		return ret;
+	}
+	/* From datasheet's table 4: electrical characteristics */
+	usleep_range(3000, 3500);
+
+	if (change) {
+		/*
+		 * Check if ODR and OSR settings are valid or we are
+		 * operating in a degraded mode.
+		 */
+		ret = regmap_read(data->regmap, BMP580_REG_EFF_OSR, &tmp);
+		if (ret) {
+			dev_err(data->dev, "error reading effective OSR register\n");
+			return ret;
+		}
+		if (!(tmp & BMP580_EFF_OSR_VALID_ODR)) {
+			dev_warn(data->dev, "OSR and ODR incompatible settings detected\n");
+			/* Set current OSR settings from data on effective OSR */
+			data->oversampling_temp = FIELD_GET(BMP580_EFF_OSR_TEMP_MASK, tmp);
+			data->oversampling_press = FIELD_GET(BMP580_EFF_OSR_PRESS_MASK, tmp);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static const int bmp580_oversampling_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128 };
+
+const struct bmp280_chip_info bmp580_chip_info = {
+	.id_reg = BMP580_REG_CHIP_ID,
+	.chip_id = BMP580_CHIP_ID,
+	.regmap_config = &bmp580_regmap_config,
+	.start_up_time = 2000,
+	.channels = bmp380_channels,
+	.num_channels = 2,
+
+	.oversampling_temp_avail = bmp580_oversampling_avail,
+	.num_oversampling_temp_avail = ARRAY_SIZE(bmp580_oversampling_avail),
+	.oversampling_temp_default = ilog2(1),
+
+	.oversampling_press_avail = bmp580_oversampling_avail,
+	.num_oversampling_press_avail = ARRAY_SIZE(bmp580_oversampling_avail),
+	.oversampling_press_default = ilog2(4),
+
+	.sampling_freq_avail = bmp580_odr_table,
+	.num_sampling_freq_avail = ARRAY_SIZE(bmp580_odr_table) * 2,
+	.sampling_freq_default = BMP580_ODR_50HZ,
+
+	.iir_filter_coeffs_avail = bmp380_iir_filter_coeffs_avail,
+	.num_iir_filter_coeffs_avail = ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),
+	.iir_filter_coeff_default = 2,
+
+	.chip_config = bmp580_chip_config,
+	.read_temp = bmp580_read_temp,
+	.read_press = bmp580_read_press,
+	.preinit = bmp580_preinit,
+};
+EXPORT_SYMBOL_NS(bmp580_chip_info, IIO_BMP280);
 
 static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
 {
···
 	return (data->t_fine + 8) >> 4;
 }
 
-static int bmp180_read_temp(struct bmp280_data *data, int *val)
+static int bmp180_read_temp(struct bmp280_data *data, int *val, int *val2)
 {
 	s32 adc_temp, comp_temp;
 	int ret;
···
 	int ret;
 
 	/* Read and compensate temperature so we get a reading of t_fine. */
-	ret = bmp180_read_temp(data, NULL);
+	ret = bmp180_read_temp(data, NULL, NULL);
 	if (ret)
 		return ret;
 
···
 static const int bmp180_oversampling_temp_avail[] = { 1 };
 static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
 
-static const struct bmp280_chip_info bmp180_chip_info = {
+const struct bmp280_chip_info bmp180_chip_info = {
 	.id_reg = BMP280_REG_ID,
+	.chip_id = BMP180_CHIP_ID,
+	.regmap_config = &bmp180_regmap_config,
 	.start_up_time = 2000,
 	.channels = bmp280_channels,
 	.num_channels = 2,
···
 	.read_press = bmp180_read_press,
 	.read_calib = bmp180_read_calib,
 };
+EXPORT_SYMBOL_NS(bmp180_chip_info, IIO_BMP280);
 
 static irqreturn_t bmp085_eoc_irq(int irq, void *d)
 {
···
 
 int bmp280_common_probe(struct device *dev,
 			struct regmap *regmap,
-			unsigned int chip,
+			const struct bmp280_chip_info *chip_info,
 			const char *name,
 			int irq)
 {
-	const struct bmp280_chip_info *chip_info;
 	struct iio_dev *indio_dev;
 	struct bmp280_data *data;
 	struct gpio_desc *gpiod;
···
 	indio_dev->info = &bmp280_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
-	switch (chip) {
-	case BMP180_CHIP_ID:
-		chip_info = &bmp180_chip_info;
-		break;
-	case BMP280_CHIP_ID:
-		chip_info = &bmp280_chip_info;
-		break;
-	case BME280_CHIP_ID:
-		chip_info = &bme280_chip_info;
-		break;
-	case BMP380_CHIP_ID:
-		chip_info = &bmp380_chip_info;
-		break;
-	default:
-		return -EINVAL;
-	}
 	data->chip_info = chip_info;
 
 	/* Apply initial values from chip info structure */
···
 	ret = regmap_read(regmap, data->chip_info->id_reg, &chip_id);
 	if (ret < 0)
 		return ret;
-	if (chip_id != chip) {
+	if (chip_id != data->chip_info->chip_id) {
 		dev_err(dev, "bad chip id: expected %x got %x\n",
-			chip, chip_id);
+			data->chip_info->chip_id, chip_id);
 		return -EINVAL;
 	}
 
-	/* BMP3xx requires soft-reset as part of initialization */
-	if (chip_id == BMP380_CHIP_ID) {
-		ret = bmp380_cmd(data, BMP380_CMD_SOFT_RESET);
-		if (ret < 0)
-			return ret;
+	if (data->chip_info->preinit) {
+		ret = data->chip_info->preinit(data);
+		if (ret)
+			return dev_err_probe(data->dev, ret,
+					     "error running preinit tasks\n");
 	}
 
 	ret = data->chip_info->chip_config(data);
···
 	 * time once. They will not change.
 	 */
 
-	ret = data->chip_info->read_calib(data);
-	if (ret < 0)
-		return dev_err_probe(data->dev, ret,
-				     "failed to read calibration coefficients\n");
+	if (data->chip_info->read_calib) {
+		ret = data->chip_info->read_calib(data);
+		if (ret < 0)
+			return dev_err_probe(data->dev, ret,
+					     "failed to read calibration coefficients\n");
+	}
 
 	/*
 	 * Attempt to grab an optional EOC IRQ - only the BMP085 has this

drivers/iio/pressure/bmp280-i2c.c

···
 static int bmp280_i2c_probe(struct i2c_client *client)
 {
 	struct regmap *regmap;
-	const struct regmap_config *regmap_config;
+	const struct bmp280_chip_info *chip_info;
 	const struct i2c_device_id *id = i2c_client_get_device_id(client);
 
-	switch (id->driver_data) {
-	case BMP180_CHIP_ID:
-		regmap_config = &bmp180_regmap_config;
-		break;
-	case BMP280_CHIP_ID:
-	case BME280_CHIP_ID:
-		regmap_config = &bmp280_regmap_config;
-		break;
-	case BMP380_CHIP_ID:
-		regmap_config = &bmp380_regmap_config;
-		break;
-	default:
-		return -EINVAL;
-	}
+	chip_info = device_get_match_data(&client->dev);
+	if (!chip_info)
+		chip_info = (const struct bmp280_chip_info *) id->driver_data;
 
-	regmap = devm_regmap_init_i2c(client, regmap_config);
+	regmap = devm_regmap_init_i2c(client, chip_info->regmap_config);
 	if (IS_ERR(regmap)) {
 		dev_err(&client->dev, "failed to allocate register map\n");
 		return PTR_ERR(regmap);
···
 
 	return bmp280_common_probe(&client->dev,
 				   regmap,
-				   id->driver_data,
+				   chip_info,
 				   id->name,
 				   client->irq);
 }
 
 static const struct of_device_id bmp280_of_i2c_match[] = {
-	{ .compatible = "bosch,bmp085", .data = (void *)BMP180_CHIP_ID },
-	{ .compatible = "bosch,bmp180", .data = (void *)BMP180_CHIP_ID },
-	{ .compatible = "bosch,bmp280", .data = (void *)BMP280_CHIP_ID },
-	{ .compatible = "bosch,bme280", .data = (void *)BME280_CHIP_ID },
-	{ .compatible = "bosch,bmp380", .data = (void *)BMP380_CHIP_ID },
+	{ .compatible = "bosch,bmp085", .data = &bmp180_chip_info },
+	{ .compatible = "bosch,bmp180", .data = &bmp180_chip_info },
+	{ .compatible = "bosch,bmp280", .data = &bmp280_chip_info },
+	{ .compatible = "bosch,bme280", .data = &bme280_chip_info },
+	{ .compatible = "bosch,bmp380", .data = &bmp380_chip_info },
+	{ .compatible = "bosch,bmp580", .data = &bmp580_chip_info },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, bmp280_of_i2c_match);
 
 static const struct i2c_device_id bmp280_i2c_id[] = {
-	{"bmp085", BMP180_CHIP_ID },
-	{"bmp180", BMP180_CHIP_ID },
-	{"bmp280", BMP280_CHIP_ID },
-	{"bme280", BME280_CHIP_ID },
-	{"bmp380", BMP380_CHIP_ID },
+	{"bmp085", (kernel_ulong_t)&bmp180_chip_info },
+	{"bmp180", (kernel_ulong_t)&bmp180_chip_info },
+	{"bmp280", (kernel_ulong_t)&bmp280_chip_info },
+	{"bme280", (kernel_ulong_t)&bme280_chip_info },
+	{"bmp380", (kernel_ulong_t)&bmp380_chip_info },
+	{"bmp580", (kernel_ulong_t)&bmp580_chip_info },
 	{ },
 };
 MODULE_DEVICE_TABLE(i2c, bmp280_i2c_id);

drivers/iio/pressure/bmp280-regmap.c

···
 	}
 }
 
+static bool bmp580_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case BMP580_REG_NVM_DATA_MSB:
+	case BMP580_REG_NVM_DATA_LSB:
+	case BMP580_REG_NVM_ADDR:
+	case BMP580_REG_ODR_CONFIG:
+	case BMP580_REG_OSR_CONFIG:
+	case BMP580_REG_INT_SOURCE:
+	case BMP580_REG_INT_CONFIG:
+	case BMP580_REG_OOR_THR_MSB:
+	case BMP580_REG_OOR_THR_LSB:
+	case BMP580_REG_OOR_CONFIG:
+	case BMP580_REG_OOR_RANGE:
+	case BMP580_REG_IF_CONFIG:
+	case BMP580_REG_FIFO_CONFIG:
+	case BMP580_REG_FIFO_SEL:
+	case BMP580_REG_DSP_CONFIG:
+	case BMP580_REG_DSP_IIR:
+	case BMP580_REG_CMD:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool bmp580_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case BMP580_REG_NVM_DATA_MSB:
+	case BMP580_REG_NVM_DATA_LSB:
+	case BMP580_REG_FIFO_COUNT:
+	case BMP580_REG_INT_STATUS:
+	case BMP580_REG_PRESS_XLSB:
+	case BMP580_REG_PRESS_LSB:
+	case BMP580_REG_PRESS_MSB:
+	case BMP580_REG_FIFO_DATA:
+	case BMP580_REG_TEMP_XLSB:
+	case BMP580_REG_TEMP_LSB:
+	case BMP580_REG_TEMP_MSB:
+	case BMP580_REG_EFF_OSR:
+	case BMP580_REG_STATUS:
+		return true;
+	default:
+		return false;
+	}
+}
+
 const struct regmap_config bmp280_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
···
 	.volatile_reg = bmp380_is_volatile_reg,
 };
 EXPORT_SYMBOL_NS(bmp380_regmap_config, IIO_BMP280);
+
+const struct regmap_config bmp580_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = BMP580_REG_CMD,
+	.cache_type = REGCACHE_RBTREE,
+
+	.writeable_reg = bmp580_is_writeable_reg,
+	.volatile_reg = bmp580_is_volatile_reg,
+};
+EXPORT_SYMBOL_NS(bmp580_regmap_config, IIO_BMP280);

drivers/iio/pressure/bmp280-spi.c

···
 static int bmp280_spi_probe(struct spi_device *spi)
 {
 	const struct spi_device_id *id = spi_get_device_id(spi);
+	const struct bmp280_chip_info *chip_info;
 	struct regmap *regmap;
-	const struct regmap_config *regmap_config;
 	int ret;
 
 	spi->bits_per_word = 8;
···
 		return ret;
 	}
 
-	switch (id->driver_data) {
-	case BMP180_CHIP_ID:
-		regmap_config = &bmp180_regmap_config;
-		break;
-	case BMP280_CHIP_ID:
-	case BME280_CHIP_ID:
-		regmap_config = &bmp280_regmap_config;
-		break;
-	case BMP380_CHIP_ID:
-		regmap_config = &bmp380_regmap_config;
-		break;
-	default:
-		return -EINVAL;
-	}
+	chip_info = device_get_match_data(&spi->dev);
+	if (!chip_info)
+		chip_info = (const struct bmp280_chip_info *) id->driver_data;
 
 	regmap = devm_regmap_init(&spi->dev,
 				  &bmp280_regmap_bus,
 				  &spi->dev,
-				  regmap_config);
+				  chip_info->regmap_config);
 	if (IS_ERR(regmap)) {
 		dev_err(&spi->dev, "failed to allocate register map\n");
 		return PTR_ERR(regmap);
···
 
 	return bmp280_common_probe(&spi->dev,
 				   regmap,
-				   id->driver_data,
+				   chip_info,
 				   id->name,
 				   spi->irq);
 }
 
 static const struct of_device_id bmp280_of_spi_match[] = {
-	{ .compatible = "bosch,bmp085", },
-	{ .compatible = "bosch,bmp180", },
-	{ .compatible = "bosch,bmp181", },
-	{ .compatible = "bosch,bmp280", },
-	{ .compatible = "bosch,bme280", },
-	{ .compatible = "bosch,bmp380", },
+	{ .compatible = "bosch,bmp085", .data = &bmp180_chip_info },
+	{ .compatible = "bosch,bmp180", .data = &bmp180_chip_info },
+	{ .compatible = "bosch,bmp181", .data = &bmp180_chip_info },
+	{ .compatible = "bosch,bmp280", .data = &bmp280_chip_info },
+	{ .compatible = "bosch,bme280", .data = &bmp280_chip_info },
+	{ .compatible = "bosch,bmp380", .data = &bmp380_chip_info },
+	{ .compatible = "bosch,bmp580", .data = &bmp580_chip_info },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, bmp280_of_spi_match);
 
 static const struct spi_device_id bmp280_spi_id[] = {
-	{ "bmp180", BMP180_CHIP_ID },
-	{ "bmp181", BMP180_CHIP_ID },
-	{ "bmp280", BMP280_CHIP_ID },
-	{ "bme280", BME280_CHIP_ID },
-	{ "bmp380", BMP380_CHIP_ID },
+	{ "bmp180", (kernel_ulong_t)&bmp180_chip_info },
+	{ "bmp181", (kernel_ulong_t)&bmp180_chip_info },
+	{ "bmp280", (kernel_ulong_t)&bmp280_chip_info },
+	{ "bme280", (kernel_ulong_t)&bmp280_chip_info },
+	{ "bmp380", (kernel_ulong_t)&bmp380_chip_info },
+	{ "bmp580", (kernel_ulong_t)&bmp580_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(spi, bmp280_spi_id);

drivers/iio/pressure/bmp280.h

···
 /* SPDX-License-Identifier: GPL-2.0 */
 #include <linux/bitops.h>
 #include <linux/device.h>
+#include <linux/iio/iio.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+
+/* BMP580 specific registers */
+#define BMP580_REG_CMD			0x7E
+#define BMP580_REG_EFF_OSR		0x38
+#define BMP580_REG_ODR_CONFIG		0x37
+#define BMP580_REG_OSR_CONFIG		0x36
+#define BMP580_REG_IF_CONFIG		0x13
+#define BMP580_REG_REV_ID		0x02
+#define BMP580_REG_CHIP_ID		0x01
+/* OOR allows to configure a pressure alarm */
+#define BMP580_REG_OOR_CONFIG		0x35
+#define BMP580_REG_OOR_RANGE		0x34
+#define BMP580_REG_OOR_THR_MSB		0x33
+#define BMP580_REG_OOR_THR_LSB		0x32
+/* DSP registers (IIR filters) */
+#define BMP580_REG_DSP_IIR		0x31
+#define BMP580_REG_DSP_CONFIG		0x30
+/* NVM access registers */
+#define BMP580_REG_NVM_DATA_MSB		0x2D
+#define BMP580_REG_NVM_DATA_LSB		0x2C
+#define BMP580_REG_NVM_ADDR		0x2B
+/* Status registers */
+#define BMP580_REG_STATUS		0x28
+#define BMP580_REG_INT_STATUS		0x27
+#define BMP580_REG_CHIP_STATUS		0x11
+/* Data registers */
+#define BMP580_REG_FIFO_DATA		0x29
+#define BMP580_REG_PRESS_MSB		0x22
+#define BMP580_REG_PRESS_LSB		0x21
+#define BMP580_REG_PRESS_XLSB		0x20
+#define BMP580_REG_TEMP_MSB		0x1F
+#define BMP580_REG_TEMP_LSB		0x1E
+#define BMP580_REG_TEMP_XLSB		0x1D
+/* FIFO config registers */
+#define BMP580_REG_FIFO_SEL		0x18
+#define BMP580_REG_FIFO_COUNT		0x17
+#define BMP580_REG_FIFO_CONFIG		0x16
+/* Interruptions config registers */
+#define BMP580_REG_INT_SOURCE		0x15
+#define BMP580_REG_INT_CONFIG		0x14
+
+#define BMP580_CMD_NOOP			0x00
+#define BMP580_CMD_EXTMODE_SEQ_0	0x73
+#define BMP580_CMD_EXTMODE_SEQ_1	0xB4
+#define BMP580_CMD_EXTMODE_SEQ_2	0x69
+#define BMP580_CMD_NVM_OP_SEQ_0		0x5D
+#define BMP580_CMD_NVM_READ_SEQ_1	0xA5
+#define BMP580_CMD_NVM_WRITE_SEQ_1	0xA0
+#define BMP580_CMD_SOFT_RESET		0xB6
+
+#define BMP580_INT_STATUS_POR_MASK	BIT(4)
+
+#define BMP580_STATUS_CORE_RDY_MASK	BIT(0)
+#define BMP580_STATUS_NVM_RDY_MASK	BIT(1)
+#define BMP580_STATUS_NVM_ERR_MASK	BIT(2)
+#define BMP580_STATUS_NVM_CMD_ERR_MASK	BIT(3)
+
+#define BMP580_OSR_PRESS_MASK		GENMASK(5, 3)
+#define BMP580_OSR_TEMP_MASK		GENMASK(2, 0)
+#define BMP580_OSR_PRESS_EN		BIT(6)
+#define BMP580_EFF_OSR_PRESS_MASK	GENMASK(5, 3)
+#define BMP580_EFF_OSR_TEMP_MASK	GENMASK(2, 0)
+#define BMP580_EFF_OSR_VALID_ODR	BIT(7)
+
+#define BMP580_ODR_MASK			GENMASK(6, 2)
+#define BMP580_MODE_MASK		GENMASK(1, 0)
+#define BMP580_MODE_SLEEP		0
+#define BMP580_MODE_NORMAL		1
+#define BMP580_MODE_FORCED		2
+#define BMP580_MODE_CONTINOUS		3
+#define BMP580_ODR_DEEPSLEEP_DIS	BIT(7)
+
+#define BMP580_DSP_COMP_MASK		GENMASK(1, 0)
+#define BMP580_DSP_COMP_DIS		0
+#define BMP580_DSP_TEMP_COMP_EN		1
+/*
+ * In section 7.27 of datasheet, modes 2 and 3 are technically the same.
+ * Pressure compensation means also enabling temperature compensation
+ */
+#define BMP580_DSP_PRESS_COMP_EN	2
+#define BMP580_DSP_PRESS_TEMP_COMP_EN	3
+#define BMP580_DSP_IIR_FORCED_FLUSH	BIT(2)
+#define BMP580_DSP_SHDW_IIR_TEMP_EN	BIT(3)
+#define BMP580_DSP_FIFO_IIR_TEMP_EN	BIT(4)
+#define BMP580_DSP_SHDW_IIR_PRESS_EN	BIT(5)
+#define BMP580_DSP_FIFO_IIR_PRESS_EN	BIT(6)
+#define BMP580_DSP_OOR_IIR_PRESS_EN	BIT(7)
+
+#define BMP580_DSP_IIR_PRESS_MASK	GENMASK(5, 3)
+#define BMP580_DSP_IIR_TEMP_MASK	GENMASK(2, 0)
+#define BMP580_FILTER_OFF		0
+#define BMP580_FILTER_1X		1
+#define BMP580_FILTER_3X		2
+#define BMP580_FILTER_7X		3
+#define BMP580_FILTER_15X		4
+#define BMP580_FILTER_31X		5
+#define BMP580_FILTER_63X		6
+#define BMP580_FILTER_127X		7
+
+#define BMP580_NVM_ROW_ADDR_MASK	GENMASK(5, 0)
+#define BMP580_NVM_PROG_EN		BIT(6)
+
+#define BMP580_TEMP_SKIPPED		0x7f7f7f
+#define BMP580_PRESS_SKIPPED		0x7f7f7f
 
 /* BMP380 specific registers */
 #define BMP380_REG_CMD			0x7E
···
 #define BMP280_REG_ID			0xD0
 
 #define BMP380_CHIP_ID			0x50
+#define BMP580_CHIP_ID			0x50
+#define BMP580_CHIP_ID_ALT		0x51
 #define BMP180_CHIP_ID			0x55
 #define BMP280_CHIP_ID			0x58
 #define BME280_CHIP_ID			0x60
···
 #define BMP280_PRESS_SKIPPED		0x80000
 #define BMP280_HUMIDITY_SKIPPED		0x8000
 
+/* Core exported structs */
+
+static const char *const bmp280_supply_names[] = {
+	"vddd", "vdda"
+};
+
+#define BMP280_NUM_SUPPLIES ARRAY_SIZE(bmp280_supply_names)
+
+struct bmp180_calib {
+	s16 AC1;
+	s16 AC2;
+	s16 AC3;
+	u16 AC4;
+	u16 AC5;
+	u16 AC6;
+	s16 B1;
+	s16 B2;
+	s16 MB;
+	s16 MC;
+	s16 MD;
+};
+
+/* See datasheet Section 4.2.2. */
+struct bmp280_calib {
+	u16 T1;
+	s16 T2;
+	s16 T3;
+	u16 P1;
+	s16 P2;
+	s16 P3;
+	s16 P4;
+	s16 P5;
+	s16 P6;
+	s16 P7;
+	s16 P8;
+	s16 P9;
+	u8  H1;
+	s16 H2;
+	u8  H3;
+	s16 H4;
+	s16 H5;
+	s8  H6;
+};
+
+/* See datasheet Section 3.11.1. */
+struct bmp380_calib {
+	u16 T1;
+	u16 T2;
+	s8  T3;
+	s16 P1;
+	s16 P2;
+	s8  P3;
+	s8  P4;
+	u16 P5;
+	u16 P6;
+	s8  P7;
+	s8  P8;
+	s16 P9;
+	s8  P10;
+	s8  P11;
+};
+
+struct bmp280_data {
+	struct device *dev;
+	struct mutex lock;
+	struct regmap *regmap;
+	struct completion done;
+	bool use_eoc;
+	const struct bmp280_chip_info *chip_info;
+	union {
+		struct bmp180_calib bmp180;
+		struct bmp280_calib bmp280;
+		struct bmp380_calib bmp380;
+	} calib;
+	struct regulator_bulk_data supplies[BMP280_NUM_SUPPLIES];
+	unsigned int start_up_time; /* in microseconds */
+
+	/* log of base 2 of oversampling rate */
+	u8 oversampling_press;
+	u8 oversampling_temp;
+	u8 oversampling_humid;
+	u8 iir_filter_coeff;
+
+	/*
+	 * BMP380 devices introduce sampling frequency configuration. See
+	 * datasheet sections 3.3.3. and 4.3.19 for more details.
+	 *
+	 * BMx280 devices allowed indirect configuration of sampling frequency
+	 * changing the t_standby duration between measurements, as detailed on
+	 * section 3.6.3 of the datasheet.
+	 */
+	int sampling_freq;
+
+	/*
+	 * Carryover value from temperature conversion, used in pressure
+	 * calculation.
+	 */
+	s32 t_fine;
+
+	/*
+	 * DMA (thus cache coherency maintenance) may require the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	union {
+		/* Sensor data buffer */
+		u8 buf[3];
+		/* Calibration data buffers */
+		__le16 bmp280_cal_buf[BMP280_CONTIGUOUS_CALIB_REGS / 2];
+		__be16 bmp180_cal_buf[BMP180_REG_CALIB_COUNT / 2];
+		u8 bmp380_cal_buf[BMP380_CALIB_REG_COUNT];
+		/* Miscellaneous, endianess-aware data buffers */
+		__le16 le16;
+		__be16 be16;
+	} __aligned(IIO_DMA_MINALIGN);
+};
+
+struct bmp280_chip_info {
+	unsigned int id_reg;
+	const unsigned int chip_id;
+
+	const struct regmap_config *regmap_config;
+
+	const struct iio_chan_spec *channels;
+	int num_channels;
+	unsigned int start_up_time;
+
+	const int *oversampling_temp_avail;
+	int num_oversampling_temp_avail;
+	int oversampling_temp_default;
+
+	const int *oversampling_press_avail;
+	int num_oversampling_press_avail;
+	int oversampling_press_default;
+
+	const int *oversampling_humid_avail;
+	int num_oversampling_humid_avail;
+	int oversampling_humid_default;
+
+	const int *iir_filter_coeffs_avail;
+	int num_iir_filter_coeffs_avail;
+	int iir_filter_coeff_default;
+
+	const int (*sampling_freq_avail)[2];
+	int num_sampling_freq_avail;
+	int sampling_freq_default;
+
+	int (*chip_config)(struct bmp280_data *);
+	int (*read_temp)(struct bmp280_data *, int *, int *);
+	int (*read_press)(struct bmp280_data *, int *, int *);
+	int (*read_humid)(struct bmp280_data *, int *, int *);
+	int (*read_calib)(struct bmp280_data *);
+	int (*preinit)(struct bmp280_data *);
+};
+
+/* Chip infos for each variant */
+extern const struct bmp280_chip_info bmp180_chip_info;
+extern const struct bmp280_chip_info bmp280_chip_info;
+extern const struct bmp280_chip_info bme280_chip_info;
+extern const struct bmp280_chip_info bmp380_chip_info;
+extern const struct bmp280_chip_info bmp580_chip_info;
+
 /* Regmap configurations */
 extern const struct regmap_config bmp180_regmap_config;
 extern const struct regmap_config bmp280_regmap_config;
 extern const struct regmap_config bmp380_regmap_config;
+extern const struct regmap_config bmp580_regmap_config;
 
 /* Probe called from different transports */
 int bmp280_common_probe(struct device *dev,
 			struct regmap *regmap,
-			unsigned int chip,
+			const struct bmp280_chip_info *,
 			const char *name,
 			int irq);
 

drivers/iio/pressure/zpa2326.c

···
 	}
 
 	/* New sample available: dispatch internal trigger consumers. */
-	iio_trigger_poll_chained(priv->trigger);
+	iio_trigger_poll_nested(priv->trigger);
 
 	if (cont)
 		/*

drivers/iio/proximity/as3935.c

···
 
 	switch (val) {
 	case AS3935_EVENT_INT:
-		iio_trigger_poll_chained(st->trig);
+		iio_trigger_poll_nested(st->trig);
 		break;
 	case AS3935_DISTURB_INT:
 	case AS3935_NOISE_INT:

drivers/iio/proximity/sx9324.c

···
 
 static const struct sx_common_reg_default sx9324_default_regs[] = {
 	{ SX9324_REG_IRQ_MSK, 0x00 },
-	{ SX9324_REG_IRQ_CFG0, 0x00 },
-	{ SX9324_REG_IRQ_CFG1, SX9324_REG_IRQ_CFG1_FAILCOND },
-	{ SX9324_REG_IRQ_CFG2, 0x00 },
-	{ SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS },
+	{ SX9324_REG_IRQ_CFG0, 0x00, "irq_cfg0" },
+	{ SX9324_REG_IRQ_CFG1, SX9324_REG_IRQ_CFG1_FAILCOND, "irq_cfg1" },
+	{ SX9324_REG_IRQ_CFG2, 0x00, "irq_cfg2" },
+	{ SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS, "gnrl_ctrl0" },
 	/*
 	 * The lower 4 bits should not be set as it enable sensors measurements.
 	 * Turning the detection on before the configuration values are set to
 	 * good values can cause the device to return erroneous readings.
 	 */
-	{ SX9324_REG_GNRL_CTRL1, SX9324_REG_GNRL_CTRL1_PAUSECTRL },
+	{ SX9324_REG_GNRL_CTRL1, SX9324_REG_GNRL_CTRL1_PAUSECTRL, "gnrl_ctrl1" },
 
-	{ SX9324_REG_AFE_CTRL0, SX9324_REG_AFE_CTRL0_RINT_LOWEST },
-	{ SX9324_REG_AFE_CTRL3, 0x00 },
+	{ SX9324_REG_AFE_CTRL0, SX9324_REG_AFE_CTRL0_RINT_LOWEST, "afe_ctrl0" },
+	{ SX9324_REG_AFE_CTRL3, 0x00, "afe_ctrl3" },
 	{ SX9324_REG_AFE_CTRL4, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
-		SX9324_REG_AFE_CTRL4_RES_100 },
-	{ SX9324_REG_AFE_CTRL6, 0x00 },
+		SX9324_REG_AFE_CTRL4_RES_100, "afe_ctrl4" },
+	{ SX9324_REG_AFE_CTRL6, 0x00, "afe_ctrl6" },
 	{ SX9324_REG_AFE_CTRL7, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
-		SX9324_REG_AFE_CTRL4_RES_100 },
+		SX9324_REG_AFE_CTRL4_RES_100, "afe_ctrl7" },
 
 	/* TODO(gwendal): PHx use chip default or all grounded? */
-	{ SX9324_REG_AFE_PH0, 0x29 },
-	{ SX9324_REG_AFE_PH1, 0x26 },
-	{ SX9324_REG_AFE_PH2, 0x1a },
-	{ SX9324_REG_AFE_PH3, 0x16 },
+	{ SX9324_REG_AFE_PH0, 0x29, "afe_ph0" },
+	{ SX9324_REG_AFE_PH1, 0x26, "afe_ph1" },
+	{ SX9324_REG_AFE_PH2, 0x1a, "afe_ph2" },
+	{ SX9324_REG_AFE_PH3, 0x16, "afe_ph3" },
 
 	{ SX9324_REG_AFE_CTRL8, SX9324_REG_AFE_CTRL8_RESERVED |
-		SX9324_REG_AFE_CTRL8_RESFILTIN_4KOHM },
-	{ SX9324_REG_AFE_CTRL9, SX9324_REG_AFE_CTRL9_AGAIN_1 },
+		SX9324_REG_AFE_CTRL8_RESFILTIN_4KOHM, "afe_ctrl8" },
+	{ SX9324_REG_AFE_CTRL9, SX9324_REG_AFE_CTRL9_AGAIN_1, "afe_ctrl9" },
 
 	{ SX9324_REG_PROX_CTRL0,
 		SX9324_REG_PROX_CTRL0_GAIN_1 << SX9324_REG_PROX_CTRL0_GAIN_SHIFT |
-		SX9324_REG_PROX_CTRL0_RAWFILT_1P50 },
+		SX9324_REG_PROX_CTRL0_RAWFILT_1P50, "prox_ctrl0" },
 	{ SX9324_REG_PROX_CTRL1,
 		SX9324_REG_PROX_CTRL0_GAIN_1 << SX9324_REG_PROX_CTRL0_GAIN_SHIFT |
-		SX9324_REG_PROX_CTRL0_RAWFILT_1P50 },
-	{ SX9324_REG_PROX_CTRL2, SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K },
+		SX9324_REG_PROX_CTRL0_RAWFILT_1P50, "prox_ctrl1" },
+	{ SX9324_REG_PROX_CTRL2, SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K, "prox_ctrl2" },
 	{ SX9324_REG_PROX_CTRL3, SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES |
-		SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K },
+		SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K, "prox_ctrl3" },
 	{ SX9324_REG_PROX_CTRL4, SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 |
-		SX9324_REG_PROX_CTRL4_AVGPOS_FILT_256 },
-	{ SX9324_REG_PROX_CTRL5, 0x00 },
-	{ SX9324_REG_PROX_CTRL6, SX9324_REG_PROX_CTRL6_PROXTHRESH_32 },
-	{ SX9324_REG_PROX_CTRL7, SX9324_REG_PROX_CTRL6_PROXTHRESH_32 },
-	{ SX9324_REG_ADV_CTRL0, 0x00 },
-	{ SX9324_REG_ADV_CTRL1, 0x00 },
-	{ SX9324_REG_ADV_CTRL2, 0x00 },
-	{ SX9324_REG_ADV_CTRL3, 0x00 },
-	{ SX9324_REG_ADV_CTRL4, 0x00 },
+		SX9324_REG_PROX_CTRL4_AVGPOS_FILT_256, "prox_ctrl4" },
+	{ SX9324_REG_PROX_CTRL5, 0x00, "prox_ctrl5" },
+	{ SX9324_REG_PROX_CTRL6, SX9324_REG_PROX_CTRL6_PROXTHRESH_32, "prox_ctrl6" },
+	{ SX9324_REG_PROX_CTRL7, SX9324_REG_PROX_CTRL6_PROXTHRESH_32, "prox_ctrl7" },
+	{ SX9324_REG_ADV_CTRL0, 0x00, "adv_ctrl0" },
+	{ SX9324_REG_ADV_CTRL1, 0x00, "adv_ctrl1" },
+	{ SX9324_REG_ADV_CTRL2, 0x00, "adv_ctrl2" },
+	{ SX9324_REG_ADV_CTRL3, 0x00, "adv_ctrl3" },
+	{ SX9324_REG_ADV_CTRL4, 0x00, "adv_ctrl4" },
 	{ SX9324_REG_ADV_CTRL5, SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1 |
-		SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1 },
-	{ SX9324_REG_ADV_CTRL6, 0x00 },
-	{ SX9324_REG_ADV_CTRL7, 0x00 },
-	{ SX9324_REG_ADV_CTRL8, 0x00 },
-	{ SX9324_REG_ADV_CTRL9, 0x00 },
+		SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1, "adv_ctrl5" },
+	{ SX9324_REG_ADV_CTRL6, 0x00, "adv_ctrl6" },
+	{ SX9324_REG_ADV_CTRL7, 0x00, "adv_ctrl7" },
+	{ SX9324_REG_ADV_CTRL8, 0x00, "adv_ctrl8" },
+	{ SX9324_REG_ADV_CTRL9, 0x00, "adv_ctrl9" },
 	/* Body/Table threshold */
-	{ SX9324_REG_ADV_CTRL10, 0x00 },
-	{ SX9324_REG_ADV_CTRL11, 0x00 },
-	{ SX9324_REG_ADV_CTRL12, 0x00 },
+	{ SX9324_REG_ADV_CTRL10, 0x00, "adv_ctrl10" },
+	{ SX9324_REG_ADV_CTRL11, 0x00, "adv_ctrl11" },
+	{ SX9324_REG_ADV_CTRL12, 0x00, "adv_ctrl12" },
 	/* TODO(gwendal): SAR currenly disabled */
-	{ SX9324_REG_ADV_CTRL13, 0x00 },
-	{ SX9324_REG_ADV_CTRL14, 0x00 },
-	{ SX9324_REG_ADV_CTRL15, 0x00 },
-	{ SX9324_REG_ADV_CTRL16, 0x00 },
-	{ SX9324_REG_ADV_CTRL17, 0x00 },
-	{ SX9324_REG_ADV_CTRL18, 0x00 },
-	{ SX9324_REG_ADV_CTRL19, SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION },
-	{ SX9324_REG_ADV_CTRL20, SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION },
+	{ SX9324_REG_ADV_CTRL13, 0x00, "adv_ctrl13" },
+	{ SX9324_REG_ADV_CTRL14, 0x00, "adv_ctrl14" },
+	{ SX9324_REG_ADV_CTRL15, 0x00, "adv_ctrl15" },
+	{ SX9324_REG_ADV_CTRL16, 0x00, "adv_ctrl16" },
+	{ SX9324_REG_ADV_CTRL17, 0x00, "adv_ctrl17" },
+	{ SX9324_REG_ADV_CTRL18, 0x00, "adv_ctrl18" },
+	{ SX9324_REG_ADV_CTRL19,
+		SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION, "adv_ctrl19" },
+	{ SX9324_REG_ADV_CTRL20,
+		SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION, "adv_ctrl20" },
 };
 
 /* Activate all channels and perform an initial compensation. */
···
 	const char *res;
 
 	memcpy(reg_def, &sx9324_default_regs[idx], sizeof(*reg_def));
+
+	sx_common_get_raw_register_config(dev, reg_def);
 	switch (reg_def->reg) {
 	case SX9324_REG_AFE_PH0:
 	case SX9324_REG_AFE_PH1:
 	case SX9324_REG_AFE_PH2:
 	case SX9324_REG_AFE_PH3:
 		ph = reg_def->reg - SX9324_REG_AFE_PH0;
-		scnprintf(prop, ARRAY_SIZE(prop), "semtech,ph%d-pin", ph);
+		snprintf(prop, ARRAY_SIZE(prop), "semtech,ph%d-pin", ph);
 
 		count = device_property_count_u32(dev, prop);
 		if (count != ARRAY_SIZE(pin_defs))

drivers/iio/proximity/sx9360.c

···
 
 static const struct sx_common_reg_default sx9360_default_regs[] = {
 	{ SX9360_REG_IRQ_MSK, 0x00 },
-	{ SX9360_REG_IRQ_CFG, 0x00 },
+	{ SX9360_REG_IRQ_CFG, 0x00, "irq_cfg" },
 	/*
 	 * The lower 2 bits should not be set as it enable sensors measurements.
 	 * Turning the detection on before the configuration values are set to
 	 * good values can cause the device to return erroneous readings.
 	 */
-	{ SX9360_REG_GNRL_CTRL0, 0x00 },
-	{ SX9360_REG_GNRL_CTRL1, 0x00 },
-	{ SX9360_REG_GNRL_CTRL2, SX9360_REG_GNRL_CTRL2_PERIOD_102MS },
+	{ SX9360_REG_GNRL_CTRL0, 0x00, "gnrl_ctrl0" },
+	{ SX9360_REG_GNRL_CTRL1, 0x00, "gnrl_ctrl1" },
+	{ SX9360_REG_GNRL_CTRL2, SX9360_REG_GNRL_CTRL2_PERIOD_102MS, "gnrl_ctrl2" },
 
-	{ SX9360_REG_AFE_CTRL1, SX9360_REG_AFE_CTRL1_RESFILTIN_0OHMS },
+	{ SX9360_REG_AFE_CTRL1, SX9360_REG_AFE_CTRL1_RESFILTIN_0OHMS, "afe_ctrl0" },
 	{ SX9360_REG_AFE_PARAM0_PHR, SX9360_REG_AFE_PARAM0_RSVD |
-		SX9360_REG_AFE_PARAM0_RESOLUTION_128 },
+		SX9360_REG_AFE_PARAM0_RESOLUTION_128, "afe_param0_phr" },
 	{ SX9360_REG_AFE_PARAM1_PHR, SX9360_REG_AFE_PARAM1_AGAIN_PHM_6PF |
-		SX9360_REG_AFE_PARAM1_FREQ_83_33HZ },
+		SX9360_REG_AFE_PARAM1_FREQ_83_33HZ, "afe_param1_phr" },
 	{ SX9360_REG_AFE_PARAM0_PHM, SX9360_REG_AFE_PARAM0_RSVD |
-		SX9360_REG_AFE_PARAM0_RESOLUTION_128 },
+		SX9360_REG_AFE_PARAM0_RESOLUTION_128, "afe_param0_phm" },
 	{ SX9360_REG_AFE_PARAM1_PHM, SX9360_REG_AFE_PARAM1_AGAIN_PHM_6PF |
-		SX9360_REG_AFE_PARAM1_FREQ_83_33HZ },
+		SX9360_REG_AFE_PARAM1_FREQ_83_33HZ, "afe_param1_phm" },
 
 	{ SX9360_REG_PROX_CTRL0_PHR, SX9360_REG_PROX_CTRL0_GAIN_1 |
-		SX9360_REG_PROX_CTRL0_RAWFILT_1P50 },
+		SX9360_REG_PROX_CTRL0_RAWFILT_1P50, "prox_ctrl0_phr" },
 	{ SX9360_REG_PROX_CTRL0_PHM, SX9360_REG_PROX_CTRL0_GAIN_1 |
-		SX9360_REG_PROX_CTRL0_RAWFILT_1P50 },
-	{ SX9360_REG_PROX_CTRL1, SX9360_REG_PROX_CTRL1_AVGNEG_THRESH_16K },
+		SX9360_REG_PROX_CTRL0_RAWFILT_1P50, "prox_ctrl0_phm" },
+	{ SX9360_REG_PROX_CTRL1, SX9360_REG_PROX_CTRL1_AVGNEG_THRESH_16K, "prox_ctrl1" },
 	{ SX9360_REG_PROX_CTRL2, SX9360_REG_PROX_CTRL2_AVGDEB_2SAMPLES |
-		SX9360_REG_PROX_CTRL2_AVGPOS_THRESH_16K },
+		SX9360_REG_PROX_CTRL2_AVGPOS_THRESH_16K, "prox_ctrl2" },
 	{ SX9360_REG_PROX_CTRL3, SX9360_REG_PROX_CTRL3_AVGNEG_FILT_2 |
-		SX9360_REG_PROX_CTRL3_AVGPOS_FILT_256 },
-	{ SX9360_REG_PROX_CTRL4, 0x00 },
-	{ SX9360_REG_PROX_CTRL5, SX9360_REG_PROX_CTRL5_PROXTHRESH_32 },
+		SX9360_REG_PROX_CTRL3_AVGPOS_FILT_256, "prox_ctrl3" },
+	{ SX9360_REG_PROX_CTRL4, 0x00, "prox_ctrl4" },
+	{ SX9360_REG_PROX_CTRL5, SX9360_REG_PROX_CTRL5_PROXTHRESH_32, "prox_ctrl5" },
 };
 
 /* Activate all channels and perform an initial compensation. */

drivers/iio/proximity/sx9500.c

···
 static struct i2c_driver sx9500_driver = {
 	.driver = {
 		.name	= SX9500_DRIVER_NAME,
-		.acpi_match_table = ACPI_PTR(sx9500_acpi_match),
-		.of_match_table = of_match_ptr(sx9500_of_match),
+		.acpi_match_table = sx9500_acpi_match,
+		.of_match_table = sx9500_of_match,
 		.pm = pm_sleep_ptr(&sx9500_pm_ops),
 	},
 	.probe_new	= sx9500_probe,

drivers/iio/proximity/sx_common.c

···
 	.postdisable = sx_common_buffer_postdisable,
 };
 
+void sx_common_get_raw_register_config(struct device *dev,
+				       struct sx_common_reg_default *reg_def)
+{
+#ifdef CONFIG_ACPI
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	u32 raw = 0, ret;
+	char prop[80];
+
+	if (!reg_def->property || !adev)
+		return;
+
+	snprintf(prop, ARRAY_SIZE(prop), "%s,reg_%s", acpi_device_hid(adev), reg_def->property);
+	ret = device_property_read_u32(dev, prop, &raw);
+	if (ret)
+		return;
+
+	reg_def->def = raw;
+#endif
+}
+EXPORT_SYMBOL_NS_GPL(sx_common_get_raw_register_config, SEMTECH_PROX);
+
 #define SX_COMMON_SOFT_RESET				0xde
 
 static int sx_common_init_device(struct device *dev, struct iio_dev *indio_dev)

drivers/iio/proximity/sx_common.h

···
 #ifndef IIO_SX_COMMON_H
 #define IIO_SX_COMMON_H
 
+#include <linux/acpi.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/types.h>
 #include <linux/regulator/consumer.h>
···
 struct sx_common_reg_default {
 	u8 reg;
 	u8 def;
+	const char *property;
 };
 
 /**
···
  * @client:		I2C client structure.
  * @trig:		IIO trigger object.
  * @regmap:		Register map.
- * @num_default_regs:	Number of default registers to set at init.
  * @chan_prox_stat:	Last reading of the proximity status for each channel.
  *			We only send an event to user space when this changes.
  * @trigger_enabled:	True when the device trigger is enabled.
···
 int sx_common_probe(struct i2c_client *client,
 		    const struct sx_common_chip_info *chip_info,
 		    const struct regmap_config *regmap_config);
+
+void sx_common_get_raw_register_config(struct device *dev,
+				       struct sx_common_reg_default *reg_def);
 
 /* 3 is the number of events defined by a single phase. */
 extern const struct iio_event_spec sx_common_events[3];

drivers/iio/temperature/tmp117.c

···
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/limits.h>
+#include <linux/property.h>
 
 #include <linux/iio/iio.h>
 
···
 #define TMP117_REG_DEVICE_ID		0xF
 
 #define TMP117_RESOLUTION_10UC		78125
-#define TMP117_DEVICE_ID		0x0117
 #define MICRODEGREE_PER_10MILLIDEGREE	10000
+
+#define TMP116_DEVICE_ID		0x1116
+#define TMP117_DEVICE_ID		0x0117
 
 struct tmp117_data {
 	struct i2c_client *client;
···
 };
 
 static int tmp117_read_raw(struct iio_dev *indio_dev,
-		struct iio_chan_spec const *channel, int *val,
-		int *val2, long mask)
+			   struct iio_chan_spec const *channel, int *val,
+			   int *val2, long mask)
 {
 	struct tmp117_data *data = iio_priv(indio_dev);
 	s32 ret;
···
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		ret = i2c_smbus_read_word_swapped(data->client,
-						TMP117_REG_TEMP);
+						  TMP117_REG_TEMP);
 		if (ret < 0)
 			return ret;
 		*val = sign_extend32(ret, 15);
···
 
 	case IIO_CHAN_INFO_CALIBBIAS:
 		ret = i2c_smbus_read_word_swapped(data->client,
-					TMP117_REG_TEMP_OFFSET);
+						  TMP117_REG_TEMP_OFFSET);
 		if (ret < 0)
 			return ret;
 		*val = sign_extend32(ret, 15);
···
 	}
 }
 
-static int tmp117_write_raw(struct iio_dev *indio_dev,
-		struct iio_chan_spec const *channel, int val,
-		int val2, long mask)
+static int tmp117_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec
+			    const *channel, int val, int val2, long mask)
 {
 	struct tmp117_data *data = iio_priv(indio_dev);
 	s16 off;
···
 	{
 		.type = IIO_TEMP,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
-			BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_SCALE),
+				      BIT(IIO_CHAN_INFO_CALIBBIAS) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+	},
+};
+
+static const struct iio_chan_spec tmp116_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
 	},
 };
 
···
 
 static int tmp117_identify(struct i2c_client *client)
 {
+	const struct i2c_device_id *id;
+	unsigned long match_data;
 	int dev_id;
 
 	dev_id = i2c_smbus_read_word_swapped(client, TMP117_REG_DEVICE_ID);
 	if (dev_id < 0)
 		return dev_id;
-	if (dev_id != TMP117_DEVICE_ID) {
-		dev_err(&client->dev, "TMP117 not found\n");
-		return -ENODEV;
+
+	switch (dev_id) {
+	case TMP116_DEVICE_ID:
+	case TMP117_DEVICE_ID:
+		return dev_id;
 	}
-	return 0;
+
+	dev_info(&client->dev, "Unknown device id (0x%x), use fallback compatible\n",
+		 dev_id);
+
+	match_data = (uintptr_t)device_get_match_data(&client->dev);
+	if (match_data)
+		return match_data;
+
+	id = i2c_client_get_device_id(client);
+	if (id)
+		return id->driver_data;
+
+	dev_err(&client->dev, "Failed to identify unsupported device\n");
+
+	return -ENODEV;
 }
 
 static int tmp117_probe(struct i2c_client *client)
 {
 	struct tmp117_data *data;
 	struct iio_dev *indio_dev;
-	int ret;
+	int ret, dev_id;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
 		return -EOPNOTSUPP;
···
 	ret = tmp117_identify(client);
 	if (ret < 0)
 		return ret;
+
+	dev_id = ret;
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (!indio_dev)
···
 	data->client = client;
 	data->calibbias = 0;
 
-	indio_dev->name = "tmp117";
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &tmp117_info;
 
-	indio_dev->channels = tmp117_channels;
-	indio_dev->num_channels = ARRAY_SIZE(tmp117_channels);
+	switch (dev_id) {
+	case TMP116_DEVICE_ID:
+		indio_dev->channels = tmp116_channels;
+		indio_dev->num_channels = ARRAY_SIZE(tmp116_channels);
+		indio_dev->name = "tmp116";
+		break;
+	case TMP117_DEVICE_ID:
+		indio_dev->channels = tmp117_channels;
+		indio_dev->num_channels = ARRAY_SIZE(tmp117_channels);
+		indio_dev->name = "tmp117";
+		break;
+	}
 
 	return devm_iio_device_register(&client->dev, indio_dev);
 }
 
 static const struct of_device_id tmp117_of_match[] = {
-	{ .compatible = "ti,tmp117", },
+	{ .compatible = "ti,tmp116", .data = (void *)TMP116_DEVICE_ID },
+	{ .compatible = "ti,tmp117", .data = (void *)TMP117_DEVICE_ID },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, tmp117_of_match);
 
 static const struct i2c_device_id tmp117_id[] = {
-	{ "tmp117", 0 },
+	{ "tmp116", TMP116_DEVICE_ID },
+	{ "tmp117", TMP117_DEVICE_ID },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tmp117_id);

drivers/iio/trigger/iio-trig-loop.c

···
 	set_freezable();
 
 	do {
-		iio_trigger_poll_chained(trig);
+		iio_trigger_poll_nested(trig);
 	} while (likely(!kthread_freezable_should_stop(NULL)));
 
 	return 0;

drivers/staging/iio/Kconfig

···
 source "drivers/staging/iio/addac/Kconfig"
 source "drivers/staging/iio/frequency/Kconfig"
 source "drivers/staging/iio/impedance-analyzer/Kconfig"
-source "drivers/staging/iio/meter/Kconfig"
 source "drivers/staging/iio/resolver/Kconfig"
 
 endmenu

drivers/staging/iio/Makefile

···
 obj-y += addac/
 obj-y += frequency/
 obj-y += impedance-analyzer/
-obj-y += meter/
 obj-y += resolver/

drivers/staging/iio/meter/Kconfig

···
-# SPDX-License-Identifier: GPL-2.0
-#
-# IIO meter drivers configuration
-#
-menu "Active energy metering IC"
-
-config ADE7854
-	tristate "Analog Devices ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver"
-	depends on SPI || I2C
-	help
-	  Say yes here to build support for Analog Devices ADE7854/58/68/78 Polyphase
-	  Multifunction Energy Metering IC Driver.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called ade7854.
-
-config ADE7854_I2C
-	tristate "support I2C bus connection"
-	depends on ADE7854 && I2C
-	default y
-	help
-	  Say Y here if you have ADE7854/58/68/78 hooked to an I2C bus.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called ade7854-i2c.
-
-config ADE7854_SPI
-	tristate "support SPI bus connection"
-	depends on ADE7854 && SPI
-	default y
-	help
-	  Say Y here if you have ADE7854/58/68/78 hooked to a SPI bus.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called ade7854-spi.
-
-endmenu

drivers/staging/iio/meter/Makefile

···
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for metering ic drivers
-#
-
-obj-$(CONFIG_ADE7854) += ade7854.o
-obj-$(CONFIG_ADE7854_I2C) += ade7854-i2c.o
-obj-$(CONFIG_ADE7854_SPI) += ade7854-spi.o

drivers/staging/iio/meter/ade7854-i2c.c

···
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver (I2C Bus)
- *
- * Copyright 2010 Analog Devices Inc.
- */
-
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/i2c.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-
-#include <linux/iio/iio.h>
-#include "ade7854.h"
-
-static int ade7854_i2c_write_reg(struct device *dev,
-				 u16 reg_address,
-				 u32 val,
-				 int bits)
-{
-	int ret;
-	int count;
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-
-	mutex_lock(&st->buf_lock);
-	st->tx[0] = (reg_address >> 8) & 0xFF;
-	st->tx[1] = reg_address & 0xFF;
-
-	switch (bits) {
-	case 8:
-		st->tx[2] = val & 0xFF;
-		count = 3;
-		break;
-	case 16:
-		st->tx[2] = (val >> 8) & 0xFF;
-		st->tx[3] = val & 0xFF;
-		count = 4;
-		break;
-	case 24:
-		st->tx[2] = (val >> 16) & 0xFF;
-		st->tx[3] = (val >> 8) & 0xFF;
-		st->tx[4] = val & 0xFF;
-		count = 5;
-		break;
-	case 32:
-		st->tx[2] = (val >> 24) & 0xFF;
-		st->tx[3] = (val >> 16) & 0xFF;
-		st->tx[4] = (val >> 8) & 0xFF;
-		st->tx[5] = val & 0xFF;
-		count = 6;
-		break;
-	default:
-		ret = -EINVAL;
-		goto unlock;
-	}
-
-	ret = i2c_master_send(st->i2c, st->tx, count);
-
-unlock:
-	mutex_unlock(&st->buf_lock);
-
-	if (ret < 0)
-		return ret;
-
-	return 0;
-}
-
-static int ade7854_i2c_read_reg(struct device *dev,
-				u16 reg_address,
-				u32 *val,
-				int bits)
-{
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-	int ret;
-
-	mutex_lock(&st->buf_lock);
-	st->tx[0] = (reg_address >> 8) & 0xFF;
-	st->tx[1] = reg_address & 0xFF;
-
-	ret = i2c_master_send(st->i2c, st->tx, 2);
-	if (ret < 0)
-		goto unlock;
-
-	ret = i2c_master_recv(st->i2c, st->rx, bits);
-	if (ret < 0)
-		goto unlock;
-
-	switch (bits) {
-	case 8:
-		*val = st->rx[0];
-		break;
-	case 16:
-		*val = (st->rx[0] << 8) | st->rx[1];
-		break;
-	case 24:
-		*val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
-		break;
-	case 32:
-		*val = (st->rx[0] << 24) | (st->rx[1] << 16) |
-			(st->rx[2] << 8) | st->rx[3];
-		break;
-	default:
-		ret = -EINVAL;
-		goto unlock;
-	}
-
-unlock:
-	mutex_unlock(&st->buf_lock);
-	return ret;
-}
-
-static int ade7854_i2c_probe(struct i2c_client *client)
-{
-	struct ade7854_state *st;
-	struct iio_dev *indio_dev;
-
-	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
-	if (!indio_dev)
-		return -ENOMEM;
-	st = iio_priv(indio_dev);
-	i2c_set_clientdata(client, indio_dev);
-	st->read_reg = ade7854_i2c_read_reg;
-	st->write_reg = ade7854_i2c_write_reg;
-	st->i2c = client;
-	st->irq = client->irq;
-
-	return ade7854_probe(indio_dev, &client->dev);
-}
-
-static const struct i2c_device_id ade7854_id[] = {
-	{ "ade7854", 0 },
-	{ "ade7858", 0 },
-	{ "ade7868", 0 },
-	{ "ade7878", 0 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, ade7854_id);
-
-static struct i2c_driver ade7854_i2c_driver = {
-	.driver = {
-		.name = "ade7854",
-	},
-	.probe_new = ade7854_i2c_probe,
-	.id_table = ade7854_id,
-};
-module_i2c_driver(ade7854_i2c_driver);
-
-MODULE_AUTHOR("Barry Song <[e-mail]>");
-MODULE_DESCRIPTION("Analog Devices ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC I2C Driver");
-MODULE_LICENSE("GPL v2");

drivers/staging/iio/meter/ade7854-spi.c

···
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver (SPI Bus)
- *
- * Copyright 2010 Analog Devices Inc.
- */
-
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/spi/spi.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-
-#include <linux/iio/iio.h>
-#include "ade7854.h"
-
-static int ade7854_spi_write_reg(struct device *dev,
-				 u16 reg_address,
-				 u32 val,
-				 int bits)
-{
-	int ret;
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-	struct spi_transfer xfer = {
-		.tx_buf = st->tx,
-		.bits_per_word = 8,
-		.len = 4,
-	};
-
-	mutex_lock(&st->buf_lock);
-	st->tx[0] = ADE7854_WRITE_REG;
-	st->tx[1] = (reg_address >> 8) & 0xFF;
-	st->tx[2] = reg_address & 0xFF;
-	switch (bits) {
-	case 8:
-		st->tx[3] = val & 0xFF;
-		break;
-	case 16:
-		xfer.len = 5;
-		st->tx[3] = (val >> 8) & 0xFF;
-		st->tx[4] = val & 0xFF;
-		break;
-	case 24:
-		xfer.len = 6;
-		st->tx[3] = (val >> 16) & 0xFF;
-		st->tx[4] = (val >> 8) & 0xFF;
-		st->tx[5] = val & 0xFF;
-		break;
-	case 32:
-		xfer.len = 7;
-		st->tx[3] = (val >> 24) & 0xFF;
-		st->tx[4] = (val >> 16) & 0xFF;
-		st->tx[5] = (val >> 8) & 0xFF;
-		st->tx[6] = val & 0xFF;
-		break;
-	default:
-		ret = -EINVAL;
-		goto unlock;
-	}
-
-	ret = spi_sync_transfer(st->spi, &xfer, 1);
-unlock:
-	mutex_unlock(&st->buf_lock);
-
-	return ret;
-}
-
-static int ade7854_spi_read_reg(struct device *dev,
-				u16 reg_address,
-				u32 *val,
-				int bits)
-{
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-	int ret;
-	struct spi_transfer xfers[] = {
-		{
-			.tx_buf = st->tx,
-			.bits_per_word = 8,
-			.len = 3,
-		}, {
-			.rx_buf = st->rx,
-			.bits_per_word = 8,
-			.len = bits,
-		}
-	};
-
-	mutex_lock(&st->buf_lock);
-
-	st->tx[0] = ADE7854_READ_REG;
-	st->tx[1] = (reg_address >> 8) & 0xFF;
-	st->tx[2] = reg_address & 0xFF;
-
-	ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));
-	if (ret < 0) {
-		dev_err(&st->spi->dev, "problem when reading register 0x%02X",
-			reg_address);
-		goto unlock;
-	}
-
-	switch (bits) {
-	case 8:
-		*val = st->rx[0];
-		break;
-	case 16:
-		*val = be16_to_cpup((const __be16 *)st->rx);
-		break;
-	case 24:
-		*val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
-		break;
-	case 32:
-		*val = be32_to_cpup((const __be32 *)st->rx);
-		break;
-	}
-
-unlock:
-	mutex_unlock(&st->buf_lock);
-	return ret;
-}
-
-static int ade7854_spi_probe(struct spi_device *spi)
-{
-	struct ade7854_state *st;
-	struct iio_dev *indio_dev;
-
-	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
-	if (!indio_dev)
-		return -ENOMEM;
-	st = iio_priv(indio_dev);
-	spi_set_drvdata(spi, indio_dev);
-	st->read_reg = ade7854_spi_read_reg;
-	st->write_reg = ade7854_spi_write_reg;
-	st->irq = spi->irq;
-	st->spi = spi;
-
-	return ade7854_probe(indio_dev, &spi->dev);
-}
-
-static const struct spi_device_id ade7854_id[] = {
-	{ "ade7854", 0 },
-	{ "ade7858", 0 },
-	{ "ade7868", 0 },
-	{ "ade7878", 0 },
-	{ }
-};
-MODULE_DEVICE_TABLE(spi, ade7854_id);
-
-static struct spi_driver ade7854_driver = {
-	.driver = {
-		.name = "ade7854",
-	},
-	.probe = ade7854_spi_probe,
-	.id_table = ade7854_id,
-};
-module_spi_driver(ade7854_driver);
-
-MODULE_AUTHOR("Barry Song <[e-mail]>");
-MODULE_DESCRIPTION("Analog Devices ADE7854/58/68/78 SPI Driver");
-MODULE_LICENSE("GPL v2");

drivers/staging/iio/meter/ade7854.c

···
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver
- *
- * Copyright 2010 Analog Devices Inc.
- */
-
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/delay.h>
-#include <linux/mutex.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/list.h>
-#include <linux/module.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-#include "meter.h"
-#include "ade7854.h"
-
-static ssize_t ade7854_read_8bit(struct device *dev,
-				 struct device_attribute *attr,
-				 char *buf)
-{
-	int ret;
-	u32 val = 0;
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
-	ret = st->read_reg(dev, this_attr->address, &val, 8);
-	if (ret < 0)
-		return ret;
-
-	return sprintf(buf, "%u\n", val);
-}
-
-static ssize_t ade7854_read_16bit(struct device *dev,
-				  struct device_attribute *attr,
-				  char *buf)
-{
-	int ret;
-	u32 val = 0;
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
-	ret = st->read_reg(dev, this_attr->address, &val, 16);
-	if (ret < 0)
-		return ret;
-
-	return sprintf(buf, "%u\n", val);
-}
-
-static ssize_t ade7854_read_24bit(struct device *dev,
-				  struct device_attribute *attr,
-				  char *buf)
-{
-	int ret;
-	u32 val;
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
-	ret = st->read_reg(dev, this_attr->address, &val, 24);
-	if (ret < 0)
-		return ret;
-
-	return sprintf(buf, "%u\n", val);
-}
-
-static ssize_t ade7854_read_32bit(struct device *dev,
-				  struct device_attribute *attr,
-				  char *buf)
-{
-	int ret;
-	u32 val = 0;
-	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-
-	ret = st->read_reg(dev, this_attr->address, &val, 32);
-	if (ret < 0)
-		return ret;
-
-	return sprintf(buf, "%u\n", val);
-}
-
-static ssize_t ade7854_write_8bit(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf,
-				  size_t len)
-{
-	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-
-	int ret;
-	u8 val;
-
-	ret = kstrtou8(buf, 10, &val);
-	if (ret)
-		goto error_ret;
-	ret = st->write_reg(dev, this_attr->address, val, 8);
-
-error_ret:
-	return ret ? ret : len;
-}
-
-static ssize_t ade7854_write_16bit(struct device *dev,
-				   struct device_attribute *attr,
-				   const char *buf,
-				   size_t len)
-{
-	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-
-	int ret;
-	u16 val;
-
-	ret = kstrtou16(buf, 10, &val);
-	if (ret)
-		goto error_ret;
-	ret = st->write_reg(dev, this_attr->address, val, 16);
-
-error_ret:
-	return ret ? ret : len;
-}
-
-static ssize_t ade7854_write_24bit(struct device *dev,
-				   struct device_attribute *attr,
-				   const char *buf,
-				   size_t len)
-{
-	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-
-	int ret;
-	u32 val;
-
-	ret = kstrtou32(buf, 10, &val);
-	if (ret)
-		goto error_ret;
-	ret = st->write_reg(dev, this_attr->address, val, 24);
-
-error_ret:
-	return ret ? ret : len;
-}
-
-static ssize_t ade7854_write_32bit(struct device *dev,
-				   struct device_attribute *attr,
-				   const char *buf,
-				   size_t len)
-{
-	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-
-	int ret;
-	u32 val;
-
-	ret = kstrtou32(buf, 10, &val);
-	if (ret)
-		goto error_ret;
-	ret = st->write_reg(dev, this_attr->address, val, 32);
-
-error_ret:
-	return ret ? ret : len;
-}
-
-static int ade7854_reset(struct device *dev)
-{
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-	u32 val;
-
-	st->read_reg(dev, ADE7854_CONFIG, &val, 16);
-	val |= BIT(7); /* Software Chip Reset */
-
-	return st->write_reg(dev, ADE7854_CONFIG, val, 16);
-}
-
-static IIO_DEV_ATTR_AIGAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_AIGAIN);
-static IIO_DEV_ATTR_BIGAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_BIGAIN);
-static IIO_DEV_ATTR_CIGAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_CIGAIN);
-static IIO_DEV_ATTR_NIGAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_NIGAIN);
-static IIO_DEV_ATTR_AVGAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_AVGAIN);
-static IIO_DEV_ATTR_BVGAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_BVGAIN);
-static IIO_DEV_ATTR_CVGAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_CVGAIN);
-static IIO_DEV_ATTR_APPARENT_POWER_A_GAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_AVAGAIN);
-static IIO_DEV_ATTR_APPARENT_POWER_B_GAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_BVAGAIN);
-static IIO_DEV_ATTR_APPARENT_POWER_C_GAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_CVAGAIN);
-static IIO_DEV_ATTR_ACTIVE_POWER_A_OFFSET(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_AWATTOS);
-static IIO_DEV_ATTR_ACTIVE_POWER_B_OFFSET(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_BWATTOS);
-static IIO_DEV_ATTR_ACTIVE_POWER_C_OFFSET(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_CWATTOS);
-static IIO_DEV_ATTR_REACTIVE_POWER_A_GAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_AVARGAIN);
-static IIO_DEV_ATTR_REACTIVE_POWER_B_GAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_BVARGAIN);
-static IIO_DEV_ATTR_REACTIVE_POWER_C_GAIN(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_CVARGAIN);
-static IIO_DEV_ATTR_REACTIVE_POWER_A_OFFSET(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_AVAROS);
-static IIO_DEV_ATTR_REACTIVE_POWER_B_OFFSET(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_BVAROS);
-static IIO_DEV_ATTR_REACTIVE_POWER_C_OFFSET(0644,
-		ade7854_read_24bit,
-		ade7854_write_24bit,
-		ADE7854_CVAROS);
-static IIO_DEV_ATTR_VPEAK(0644,
-		ade7854_read_32bit,
-		ade7854_write_32bit,
-		ADE7854_VPEAK);
-static IIO_DEV_ATTR_IPEAK(0644,
-		ade7854_read_32bit,
-		ade7854_write_32bit,
-		ADE7854_IPEAK);
-static IIO_DEV_ATTR_APHCAL(0644,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_APHCAL);
-static IIO_DEV_ATTR_BPHCAL(0644,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_BPHCAL);
-static IIO_DEV_ATTR_CPHCAL(0644,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_CPHCAL);
-static IIO_DEV_ATTR_CF1DEN(0644,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_CF1DEN);
-static IIO_DEV_ATTR_CF2DEN(0644,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_CF2DEN);
-static IIO_DEV_ATTR_CF3DEN(0644,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_CF3DEN);
-static IIO_DEV_ATTR_LINECYC(0644,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_LINECYC);
-static IIO_DEV_ATTR_SAGCYC(0644,
-		ade7854_read_8bit,
-		ade7854_write_8bit,
-		ADE7854_SAGCYC);
-static IIO_DEV_ATTR_CFCYC(0644,
-		ade7854_read_8bit,
-		ade7854_write_8bit,
-		ADE7854_CFCYC);
-static IIO_DEV_ATTR_PEAKCYC(0644,
-		ade7854_read_8bit,
-		ade7854_write_8bit,
-		ADE7854_PEAKCYC);
-static IIO_DEV_ATTR_CHKSUM(ade7854_read_24bit,
-		ADE7854_CHECKSUM);
-static IIO_DEV_ATTR_ANGLE0(ade7854_read_24bit,
-		ADE7854_ANGLE0);
-static IIO_DEV_ATTR_ANGLE1(ade7854_read_24bit,
-		ADE7854_ANGLE1);
-static IIO_DEV_ATTR_ANGLE2(ade7854_read_24bit,
-		ADE7854_ANGLE2);
-static IIO_DEV_ATTR_AIRMS(0444,
-		ade7854_read_24bit,
-		NULL,
-		ADE7854_AIRMS);
-static IIO_DEV_ATTR_BIRMS(0444,
-		ade7854_read_24bit,
-		NULL,
-		ADE7854_BIRMS);
-static IIO_DEV_ATTR_CIRMS(0444,
-		ade7854_read_24bit,
-		NULL,
-		ADE7854_CIRMS);
-static IIO_DEV_ATTR_NIRMS(0444,
-		ade7854_read_24bit,
-		NULL,
-		ADE7854_NIRMS);
-static IIO_DEV_ATTR_AVRMS(0444,
-		ade7854_read_24bit,
-		NULL,
-		ADE7854_AVRMS);
-static IIO_DEV_ATTR_BVRMS(0444,
-		ade7854_read_24bit,
-		NULL,
-		ADE7854_BVRMS);
-static IIO_DEV_ATTR_CVRMS(0444,
-		ade7854_read_24bit,
-		NULL,
-		ADE7854_CVRMS);
-static IIO_DEV_ATTR_AIRMSOS(0444,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_AIRMSOS);
-static IIO_DEV_ATTR_BIRMSOS(0444,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_BIRMSOS);
-static IIO_DEV_ATTR_CIRMSOS(0444,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_CIRMSOS);
-static IIO_DEV_ATTR_AVRMSOS(0444,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_AVRMSOS);
-static IIO_DEV_ATTR_BVRMSOS(0444,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_BVRMSOS);
-static IIO_DEV_ATTR_CVRMSOS(0444,
-		ade7854_read_16bit,
-		ade7854_write_16bit,
-		ADE7854_CVRMSOS);
-static IIO_DEV_ATTR_VOLT_A(ade7854_read_24bit,
-		ADE7854_VAWV);
-static IIO_DEV_ATTR_VOLT_B(ade7854_read_24bit,
-		ADE7854_VBWV);
-static IIO_DEV_ATTR_VOLT_C(ade7854_read_24bit,
-		ADE7854_VCWV);
-static IIO_DEV_ATTR_CURRENT_A(ade7854_read_24bit,
-		ADE7854_IAWV);
-static IIO_DEV_ATTR_CURRENT_B(ade7854_read_24bit,
-		ADE7854_IBWV);
-static IIO_DEV_ATTR_CURRENT_C(ade7854_read_24bit,
-		ADE7854_ICWV);
-static IIO_DEV_ATTR_AWATTHR(ade7854_read_32bit,
-		ADE7854_AWATTHR);
-static IIO_DEV_ATTR_BWATTHR(ade7854_read_32bit,
-		ADE7854_BWATTHR);
-static IIO_DEV_ATTR_CWATTHR(ade7854_read_32bit,
-		ADE7854_CWATTHR);
-static IIO_DEV_ATTR_AFWATTHR(ade7854_read_32bit,
-		ADE7854_AFWATTHR);
-static IIO_DEV_ATTR_BFWATTHR(ade7854_read_32bit,
-		ADE7854_BFWATTHR);
-static IIO_DEV_ATTR_CFWATTHR(ade7854_read_32bit,
-		ADE7854_CFWATTHR);
-static IIO_DEV_ATTR_AVARHR(ade7854_read_32bit,
-		ADE7854_AVARHR);
-static IIO_DEV_ATTR_BVARHR(ade7854_read_32bit,
-		ADE7854_BVARHR);
-static IIO_DEV_ATTR_CVARHR(ade7854_read_32bit,
-		ADE7854_CVARHR);
-static IIO_DEV_ATTR_AVAHR(ade7854_read_32bit,
-		ADE7854_AVAHR);
-static IIO_DEV_ATTR_BVAHR(ade7854_read_32bit,
-		ADE7854_BVAHR);
-static IIO_DEV_ATTR_CVAHR(ade7854_read_32bit,
-		ADE7854_CVAHR);
-
-static int ade7854_set_irq(struct device *dev, bool enable)
-{
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ade7854_state *st = iio_priv(indio_dev);
-
-	int ret;
-	u32 irqen;
-
-	ret = st->read_reg(dev, ADE7854_MASK0, &irqen, 32);
-	if (ret < 0)
-		return ret;
-
-	if (enable)
-		irqen |= BIT(17); /* 1: interrupt enabled when all periodical
-				   * (at 8 kHz rate) DSP computations finish.
-				   */
-	else
-		irqen &= ~BIT(17);
-
-	return st->write_reg(dev, ADE7854_MASK0, irqen, 32);
-}
-
-static int ade7854_initial_setup(struct iio_dev *indio_dev)
-{
-	int ret;
-	struct device *dev = &indio_dev->dev;
-
-	/* Disable IRQ */
-	ret = ade7854_set_irq(dev, false);
-	if (ret) {
-		dev_err(dev, "disable irq failed");
-		goto err_ret;
-	}
-
-	ade7854_reset(dev);
-	usleep_range(ADE7854_STARTUP_DELAY, ADE7854_STARTUP_DELAY + 100);
-
-err_ret:
-	return ret;
-}
-
-static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("8000");
-
-static IIO_CONST_ATTR(name, "ade7854");
-
-static struct attribute *ade7854_attributes[] = {
-	&iio_dev_attr_aigain.dev_attr.attr,
-	&iio_dev_attr_bigain.dev_attr.attr,
-	&iio_dev_attr_cigain.dev_attr.attr,
-	&iio_dev_attr_nigain.dev_attr.attr,
-	&iio_dev_attr_avgain.dev_attr.attr,
-	&iio_dev_attr_bvgain.dev_attr.attr,
-	&iio_dev_attr_cvgain.dev_attr.attr,
-	&iio_dev_attr_linecyc.dev_attr.attr,
-	&iio_dev_attr_sagcyc.dev_attr.attr,
-	&iio_dev_attr_cfcyc.dev_attr.attr,
-	&iio_dev_attr_peakcyc.dev_attr.attr,
-	&iio_dev_attr_chksum.dev_attr.attr,
-	&iio_dev_attr_apparent_power_a_gain.dev_attr.attr,
-	&iio_dev_attr_apparent_power_b_gain.dev_attr.attr,
-	&iio_dev_attr_apparent_power_c_gain.dev_attr.attr,
-	&iio_dev_attr_active_power_a_offset.dev_attr.attr,
-	&iio_dev_attr_active_power_b_offset.dev_attr.attr,
-	&iio_dev_attr_active_power_c_offset.dev_attr.attr,
-	&iio_dev_attr_reactive_power_a_gain.dev_attr.attr,
-	&iio_dev_attr_reactive_power_b_gain.dev_attr.attr,
-	&iio_dev_attr_reactive_power_c_gain.dev_attr.attr,
-	&iio_dev_attr_reactive_power_a_offset.dev_attr.attr,
-	&iio_dev_attr_reactive_power_b_offset.dev_attr.attr,
-	&iio_dev_attr_reactive_power_c_offset.dev_attr.attr,
-	&iio_dev_attr_awatthr.dev_attr.attr,
-	&iio_dev_attr_bwatthr.dev_attr.attr,
-	&iio_dev_attr_cwatthr.dev_attr.attr,
-	&iio_dev_attr_afwatthr.dev_attr.attr,
-	&iio_dev_attr_bfwatthr.dev_attr.attr,
-	&iio_dev_attr_cfwatthr.dev_attr.attr,
-	&iio_dev_attr_avarhr.dev_attr.attr,
-	&iio_dev_attr_bvarhr.dev_attr.attr,
-	&iio_dev_attr_cvarhr.dev_attr.attr,
-	&iio_dev_attr_angle0.dev_attr.attr,
-	&iio_dev_attr_angle1.dev_attr.attr,
-	&iio_dev_attr_angle2.dev_attr.attr,
-	&iio_dev_attr_avahr.dev_attr.attr,
-	&iio_dev_attr_bvahr.dev_attr.attr,
-	&iio_dev_attr_cvahr.dev_attr.attr,
-	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
-	&iio_const_attr_name.dev_attr.attr,
-	&iio_dev_attr_vpeak.dev_attr.attr,
-	&iio_dev_attr_ipeak.dev_attr.attr,
-	&iio_dev_attr_aphcal.dev_attr.attr,
-	&iio_dev_attr_bphcal.dev_attr.attr,
-	&iio_dev_attr_cphcal.dev_attr.attr,
-	&iio_dev_attr_cf1den.dev_attr.attr,
-	&iio_dev_attr_cf2den.dev_attr.attr,
-	&iio_dev_attr_cf3den.dev_attr.attr,
-	&iio_dev_attr_airms.dev_attr.attr,
-	&iio_dev_attr_birms.dev_attr.attr,
-	&iio_dev_attr_cirms.dev_attr.attr,
-	&iio_dev_attr_nirms.dev_attr.attr,
-	&iio_dev_attr_avrms.dev_attr.attr,
-	&iio_dev_attr_bvrms.dev_attr.attr,
-	&iio_dev_attr_cvrms.dev_attr.attr,
-	&iio_dev_attr_airmsos.dev_attr.attr,
-	&iio_dev_attr_birmsos.dev_attr.attr,
-	&iio_dev_attr_cirmsos.dev_attr.attr,
-	&iio_dev_attr_avrmsos.dev_attr.attr,
-	&iio_dev_attr_bvrmsos.dev_attr.attr,
-	&iio_dev_attr_cvrmsos.dev_attr.attr,
-	&iio_dev_attr_volt_a.dev_attr.attr,
-	&iio_dev_attr_volt_b.dev_attr.attr,
-	&iio_dev_attr_volt_c.dev_attr.attr,
-	&iio_dev_attr_current_a.dev_attr.attr,
-	&iio_dev_attr_current_b.dev_attr.attr,
-	&iio_dev_attr_current_c.dev_attr.attr,
-	NULL,
-};
-
-static const struct attribute_group ade7854_attribute_group = {
-	.attrs = ade7854_attributes,
-};
-
-static const struct iio_info ade7854_info = {
-	.attrs = &ade7854_attribute_group,
-};
-
-int ade7854_probe(struct iio_dev *indio_dev, struct device *dev)
-{
-	int ret;
-	struct ade7854_state *st = iio_priv(indio_dev);
-	/* setup the industrialio driver allocated elements */
-	mutex_init(&st->buf_lock);
-
-	indio_dev->dev.parent = dev;
-	indio_dev->info = &ade7854_info;
-	indio_dev->modes = INDIO_DIRECT_MODE;
-
-	ret = devm_iio_device_register(dev, indio_dev);
-	if (ret)
-		return ret;
-
-	/* Get the device into a sane initial state */
-	return ade7854_initial_setup(indio_dev);
-}
-EXPORT_SYMBOL(ade7854_probe);
-
-MODULE_AUTHOR("Barry Song <[e-mail]>");
-MODULE_DESCRIPTION("Analog Devices ADE7854/58/68/78 Polyphase Energy Meter");
-MODULE_LICENSE("GPL v2");

drivers/staging/iio/meter/ade7854.h

···
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ADE7854_H
-#define _ADE7854_H
-
-#define ADE7854_AIGAIN    0x4380
-#define ADE7854_AVGAIN    0x4381
-#define ADE7854_BIGAIN    0x4382
-#define ADE7854_BVGAIN    0x4383
-#define ADE7854_CIGAIN    0x4384
-#define ADE7854_CVGAIN    0x4385
-#define ADE7854_NIGAIN    0x4386
-#define ADE7854_AIRMSOS   0x4387
-#define ADE7854_AVRMSOS   0x4388
-#define ADE7854_BIRMSOS   0x4389
-#define ADE7854_BVRMSOS   0x438A
-#define ADE7854_CIRMSOS   0x438B
-#define ADE7854_CVRMSOS   0x438C
-#define ADE7854_NIRMSOS   0x438D
-#define ADE7854_AVAGAIN   0x438E
-#define ADE7854_BVAGAIN   0x438F
-#define ADE7854_CVAGAIN   0x4390
-#define ADE7854_AWGAIN    0x4391
-#define ADE7854_AWATTOS   0x4392
-#define ADE7854_BWGAIN    0x4393
-#define ADE7854_BWATTOS   0x4394
-#define ADE7854_CWGAIN    0x4395
-#define ADE7854_CWATTOS   0x4396
-#define ADE7854_AVARGAIN  0x4397
-#define ADE7854_AVAROS    0x4398
-#define ADE7854_BVARGAIN  0x4399
-#define ADE7854_BVAROS    0x439A
-#define ADE7854_CVARGAIN  0x439B
-#define ADE7854_CVAROS    0x439C
-#define ADE7854_AFWGAIN   0x439D
-#define ADE7854_AFWATTOS  0x439E
-#define ADE7854_BFWGAIN   0x439F
-#define ADE7854_BFWATTOS  0x43A0
-#define ADE7854_CFWGAIN   0x43A1
-#define ADE7854_CFWATTOS  0x43A2
-#define ADE7854_AFVARGAIN 0x43A3
-#define ADE7854_AFVAROS   0x43A4
-#define ADE7854_BFVARGAIN 0x43A5
-#define ADE7854_BFVAROS   0x43A6
-#define ADE7854_CFVARGAIN 0x43A7
-#define ADE7854_CFVAROS   0x43A8
-#define ADE7854_VATHR1    0x43A9
-#define ADE7854_VATHR0    0x43AA
-#define ADE7854_WTHR1     0x43AB
-#define ADE7854_WTHR0     0x43AC
-#define ADE7854_VARTHR1   0x43AD
-#define ADE7854_VARTHR0   0x43AE
-#define ADE7854_RSV       0x43AF
-#define ADE7854_VANOLOAD  0x43B0
-#define ADE7854_APNOLOAD  0x43B1
-#define ADE7854_VARNOLOAD 0x43B2
-#define ADE7854_VLEVEL    0x43B3
-#define ADE7854_DICOEFF   0x43B5
-#define ADE7854_HPFDIS    0x43B6
-#define ADE7854_ISUMLVL   0x43B8
-#define ADE7854_ISUM      0x43BF
-#define ADE7854_AIRMS     0x43C0
-#define ADE7854_AVRMS     0x43C1
-#define ADE7854_BIRMS     0x43C2
-#define ADE7854_BVRMS     0x43C3
-#define ADE7854_CIRMS     0x43C4
-#define ADE7854_CVRMS     0x43C5
-#define ADE7854_NIRMS     0x43C6
-#define ADE7854_RUN       0xE228
-#define ADE7854_AWATTHR   0xE400
-#define ADE7854_BWATTHR   0xE401
-#define ADE7854_CWATTHR   0xE402
-#define ADE7854_AFWATTHR  0xE403
-#define ADE7854_BFWATTHR  0xE404
-#define ADE7854_CFWATTHR  0xE405
-#define ADE7854_AVARHR    0xE406
-#define ADE7854_BVARHR    0xE407
-#define ADE7854_CVARHR    0xE408
-#define ADE7854_AFVARHR   0xE409
-#define ADE7854_BFVARHR   0xE40A
-#define ADE7854_CFVARHR   0xE40B
-#define ADE7854_AVAHR     0xE40C
-#define ADE7854_BVAHR     0xE40D
-#define ADE7854_CVAHR     0xE40E
-#define ADE7854_IPEAK     0xE500
-#define ADE7854_VPEAK     0xE501
-#define ADE7854_STATUS0   0xE502
-#define ADE7854_STATUS1   0xE503
-#define ADE7854_OILVL     0xE507
-#define ADE7854_OVLVL     0xE508
-#define ADE7854_SAGLVL    0xE509
-#define ADE7854_MASK0     0xE50A
-#define ADE7854_MASK1     0xE50B
-#define ADE7854_IAWV      0xE50C
-#define ADE7854_IBWV      0xE50D
-#define ADE7854_ICWV      0xE50E
-#define ADE7854_VAWV      0xE510
-#define ADE7854_VBWV      0xE511
-#define ADE7854_VCWV      0xE512
-#define ADE7854_AWATT     0xE513
-#define ADE7854_BWATT     0xE514
-#define ADE7854_CWATT     0xE515
-#define ADE7854_AVA       0xE519
-#define ADE7854_BVA       0xE51A
-#define ADE7854_CVA       0xE51B
-#define ADE7854_CHECKSUM  0xE51F
-#define ADE7854_VNOM      0xE520
-#define ADE7854_PHSTATUS  0xE600
-#define ADE7854_ANGLE0    0xE601
-#define ADE7854_ANGLE1    0xE602
-#define ADE7854_ANGLE2    0xE603
-#define ADE7854_PERIOD    0xE607
-#define ADE7854_PHNOLOAD  0xE608
-#define ADE7854_LINECYC   0xE60C
-#define ADE7854_ZXTOUT    0xE60D
-#define ADE7854_COMPMODE  0xE60E
-#define ADE7854_GAIN      0xE60F
-#define ADE7854_CFMODE    0xE610
-#define ADE7854_CF1DEN    0xE611
-#define ADE7854_CF2DEN    0xE612
-#define ADE7854_CF3DEN    0xE613
-#define ADE7854_APHCAL    0xE614
-#define ADE7854_BPHCAL    0xE615
-#define ADE7854_CPHCAL    0xE616
-#define ADE7854_PHSIGN    0xE617
-#define ADE7854_CONFIG    0xE618
-#define ADE7854_MMODE     0xE700
-#define ADE7854_ACCMODE   0xE701
-#define ADE7854_LCYCMODE  0xE702
-#define ADE7854_PEAKCYC   0xE703
-#define ADE7854_SAGCYC    0xE704
-#define ADE7854_CFCYC     0xE705
-#define ADE7854_HSDC_CFG  0xE706
-#define ADE7854_CONFIG2   0xEC01
-
-#define ADE7854_READ_REG   0x1
-#define ADE7854_WRITE_REG  0x0
-
-#define ADE7854_MAX_TX    7
-#define ADE7854_MAX_RX    7
-#define ADE7854_STARTUP_DELAY 1000
-
-#define ADE7854_SPI_SLOW	(u32)(300 * 1000)
-#define ADE7854_SPI_BURST	(u32)(1000 * 1000)
-#define ADE7854_SPI_FAST	(u32)(2000 * 1000)
-
-/**
- * struct ade7854_state - device instance specific data
- * @spi:		actual spi_device
- * @read_reg		Wrapper function for I2C and SPI read
- * @write_reg		Wrapper function for I2C and SPI write
- * @indio_dev:		industrial I/O device structure
- * @buf_lock:		mutex to protect tx and rx
- * @tx:			transmit buffer
- * @rx:			receive buffer
- **/
-struct ade7854_state {
-	struct spi_device *spi;
-	struct i2c_client *i2c;
-	int (*read_reg)(struct device *dev, u16 reg_address, u32 *val,
-			int bits);
-	int (*write_reg)(struct device *dev, u16 reg_address, u32 val,
-			 int bits);
-	int irq;
-	struct mutex buf_lock;
-	u8 tx[ADE7854_MAX_TX] __aligned(IIO_DMA_MINALIGN);
-	u8 rx[ADE7854_MAX_RX];
-
-};
-
-int ade7854_probe(struct iio_dev *indio_dev, struct device *dev);
-int ade7854_remove(struct iio_dev *indio_dev);
-
-#endif

drivers/staging/iio/meter/meter.h

···
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _METER_H
-#define _METER_H
-
-#include <linux/iio/sysfs.h>
-
-/* metering ic types of attribute */
-
-#define IIO_DEV_ATTR_CURRENT_A_OFFSET(_mode, _show, _store, _addr)	\
-	IIO_DEVICE_ATTR(current_a_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CURRENT_B_OFFSET(_mode, _show, _store, _addr)	\
-	IIO_DEVICE_ATTR(current_b_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CURRENT_C_OFFSET(_mode, _show, _store, _addr)	\
-	IIO_DEVICE_ATTR(current_c_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VOLT_A_OFFSET(_mode, _show, _store, _addr)      \
-	IIO_DEVICE_ATTR(volt_a_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VOLT_B_OFFSET(_mode, _show, _store, _addr)      \
-	IIO_DEVICE_ATTR(volt_b_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VOLT_C_OFFSET(_mode, _show, _store, _addr)      \
-	IIO_DEVICE_ATTR(volt_c_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_REACTIVE_POWER_A_OFFSET(_mode, _show, _store, _addr)   \
-	IIO_DEVICE_ATTR(reactive_power_a_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_REACTIVE_POWER_B_OFFSET(_mode, _show, _store, _addr)   \
-	IIO_DEVICE_ATTR(reactive_power_b_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_REACTIVE_POWER_C_OFFSET(_mode, _show, _store, _addr)   \
-	IIO_DEVICE_ATTR(reactive_power_c_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_ACTIVE_POWER_A_OFFSET(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(active_power_a_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_ACTIVE_POWER_B_OFFSET(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(active_power_b_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_ACTIVE_POWER_C_OFFSET(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(active_power_c_offset, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CURRENT_A_GAIN(_mode, _show, _store, _addr)	\
-	IIO_DEVICE_ATTR(current_a_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CURRENT_B_GAIN(_mode, _show, _store, _addr)	\
-	IIO_DEVICE_ATTR(current_b_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CURRENT_C_GAIN(_mode, _show, _store, _addr)	\
-	IIO_DEVICE_ATTR(current_c_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_APPARENT_POWER_A_GAIN(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(apparent_power_a_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_APPARENT_POWER_B_GAIN(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(apparent_power_b_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_APPARENT_POWER_C_GAIN(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(apparent_power_c_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_ACTIVE_POWER_GAIN(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(active_power_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_ACTIVE_POWER_A_GAIN(_mode, _show, _store, _addr)   \
-	IIO_DEVICE_ATTR(active_power_a_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_ACTIVE_POWER_B_GAIN(_mode, _show, _store, _addr)   \
-	IIO_DEVICE_ATTR(active_power_b_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_ACTIVE_POWER_C_GAIN(_mode, _show, _store, _addr)   \
-	IIO_DEVICE_ATTR(active_power_c_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_REACTIVE_POWER_A_GAIN(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(reactive_power_a_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_REACTIVE_POWER_B_GAIN(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(reactive_power_b_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_REACTIVE_POWER_C_GAIN(_mode, _show, _store, _addr)     \
-	IIO_DEVICE_ATTR(reactive_power_c_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CURRENT_A(_show, _addr)			\
-	IIO_DEVICE_ATTR(current_a, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_CURRENT_B(_show, _addr)			\
-	IIO_DEVICE_ATTR(current_b, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_CURRENT_C(_show, _addr)			\
-	IIO_DEVICE_ATTR(current_c, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_VOLT_A(_show, _addr)			\
-	IIO_DEVICE_ATTR(volt_a, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_VOLT_B(_show, _addr)			\
-	IIO_DEVICE_ATTR(volt_b, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_VOLT_C(_show, _addr)			\
-	IIO_DEVICE_ATTR(volt_c, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_AENERGY(_show, _addr)			\
-	IIO_DEVICE_ATTR(aenergy, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_LENERGY(_show, _addr)			\
-	IIO_DEVICE_ATTR(lenergy, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_RAENERGY(_show, _addr)			\
-	IIO_DEVICE_ATTR(raenergy, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_LAENERGY(_show, _addr)			\
-	IIO_DEVICE_ATTR(laenergy, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_VAENERGY(_show, _addr)			\
-	IIO_DEVICE_ATTR(vaenergy, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_LVAENERGY(_show, _addr)			\
-	IIO_DEVICE_ATTR(lvaenergy, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_RVAENERGY(_show, _addr)			\
-	IIO_DEVICE_ATTR(rvaenergy, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_LVARENERGY(_show, _addr)			\
-	IIO_DEVICE_ATTR(lvarenergy, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_CHKSUM(_show, _addr)                       \
-	IIO_DEVICE_ATTR(chksum, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_ANGLE0(_show, _addr)                       \
-	IIO_DEVICE_ATTR(angle0, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_ANGLE1(_show, _addr)                       \
-	IIO_DEVICE_ATTR(angle1, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_ANGLE2(_show, _addr)                       \
-	IIO_DEVICE_ATTR(angle2, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_AWATTHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(awatthr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_BWATTHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(bwatthr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_CWATTHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(cwatthr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_AFWATTHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(afwatthr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_BFWATTHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(bfwatthr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_CFWATTHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(cfwatthr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_AVARHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(avarhr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_BVARHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(bvarhr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_CVARHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(cvarhr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_AVAHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(avahr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_BVAHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(bvahr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_CVAHR(_show, _addr)			\
-	IIO_DEVICE_ATTR(cvahr, 0444, _show, NULL, _addr)
-
-#define IIO_DEV_ATTR_IOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(ios, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(vos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_PHCAL(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(phcal, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_APHCAL(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(aphcal, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_BPHCAL(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(bphcal, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CPHCAL(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cphcal, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_APOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(apos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_AAPOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(aapos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_BAPOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(bapos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CAPOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(capos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_AVRMSGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(avrmsgain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_BVRMSGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(bvrmsgain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CVRMSGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cvrmsgain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_AIGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(aigain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_BIGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(bigain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CIGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cigain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_NIGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(nigain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_AVGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(avgain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_BVGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(bvgain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CVGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cvgain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_WGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(wgain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_WDIV(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(wdiv, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CFNUM(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cfnum, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CFDEN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cfden, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CF1DEN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cf1den, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CF2DEN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cf2den, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CF3DEN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cf3den, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_IRMS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(irms, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VRMS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(vrms, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_AIRMS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(airms, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_BIRMS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(birms, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CIRMS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cirms, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_NIRMS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(nirms, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_AVRMS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(avrms, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_BVRMS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(bvrms, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CVRMS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cvrms, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_IRMSOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(irmsos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VRMSOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(vrmsos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_AIRMSOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(airmsos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_BIRMSOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(birmsos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CIRMSOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cirmsos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_AVRMSOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(avrmsos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_BVRMSOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(bvrmsos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CVRMSOS(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cvrmsos, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VAGAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(vagain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_PGA_GAIN(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(pga_gain, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VADIV(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(vadiv, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_LINECYC(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(linecyc, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_SAGCYC(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(sagcyc, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_CFCYC(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(cfcyc, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_PEAKCYC(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(peakcyc, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_SAGLVL(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(saglvl, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_IPKLVL(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(ipklvl, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VPKLVL(_mode, _show, _store, _addr)                \
-	IIO_DEVICE_ATTR(vpklvl, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_IPEAK(_mode, _show, _store, _addr)			\
-	IIO_DEVICE_ATTR(ipeak, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_RIPEAK(_mode, _show, _store, _addr)		\
-	IIO_DEVICE_ATTR(ripeak, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VPEAK(_mode, _show, _store, _addr)			\
-	IIO_DEVICE_ATTR(vpeak, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_RVPEAK(_mode, _show, _store, _addr)		\
-	IIO_DEVICE_ATTR(rvpeak, _mode, _show, _store, _addr)
-
-#define IIO_DEV_ATTR_VPERIOD(_mode, _show, _store, _addr)		\
-	IIO_DEVICE_ATTR(vperiod, _mode, _show, _store, _addr)
-
-/* active energy register, AENERGY, is more than half full */
-#define IIO_EVENT_ATTR_AENERGY_HALF_FULL(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(aenergy_half_full, _evlist, _show, _store, _mask)
-
-/* a SAG on the line voltage */
-#define IIO_EVENT_ATTR_LINE_VOLT_SAG(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(line_volt_sag, _evlist, _show, _store, _mask)
-
-/*
- * Indicates the end of energy accumulation over an integer number
- * of half line cycles
- */
-#define IIO_EVENT_ATTR_CYCEND(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(cycend, _evlist, _show, _store, _mask)
-
-/* on the rising and falling edge of the voltage waveform */
-#define IIO_EVENT_ATTR_ZERO_CROSS(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(zero_cross, _evlist, _show, _store, _mask)
-
-/* the active energy register has overflowed */
-#define IIO_EVENT_ATTR_AENERGY_OVERFLOW(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(aenergy_overflow, _evlist, _show, _store, _mask)
-
-/* the apparent energy register has overflowed */
-#define IIO_EVENT_ATTR_VAENERGY_OVERFLOW(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(vaenergy_overflow, _evlist, _show, _store, _mask)
-
-/* the active energy register, VAENERGY, is more than half full */
-#define IIO_EVENT_ATTR_VAENERGY_HALF_FULL(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(vaenergy_half_full, _evlist, _show, _store, _mask)
-
-/* the power has gone from negative to positive */
-#define IIO_EVENT_ATTR_PPOS(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(ppos, _evlist, _show, _store, _mask)
-
-/* the power has gone from positive to negative */
-#define IIO_EVENT_ATTR_PNEG(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(pneg, _evlist, _show, _store, _mask)
-
-/* waveform sample from Channel 1 has exceeded the IPKLVL value */
-#define IIO_EVENT_ATTR_IPKLVL_EXC(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(ipklvl_exc, _evlist, _show, _store, _mask)
-
-/* waveform sample from Channel 2 has exceeded the VPKLVL value */
-#define IIO_EVENT_ATTR_VPKLVL_EXC(_evlist, _show, _store, _mask) \
-	IIO_EVENT_ATTR_SH(vpklvl_exc, _evlist, _show, _store, _mask)
-
-#endif /* _METER_H */

drivers/staging/iio/resolver/ad2s1210.c

···
 static const int ad2s1210_mode_vals[4][2] = {
 	[MOD_POS] = { 0, 0 },
 	[MOD_VEL] = { 0, 1 },
-	[MOD_CONFIG] = { 1, 0 },
+	[MOD_CONFIG] = { 1, 1 },
 };
 
 static inline void ad2s1210_set_mode(enum ad2s1210_mode mode,

include/linux/iio/iio-gts-helper.h

···
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* gain-time-scale conversion helpers for IIO light sensors
+ *
+ * Copyright (c) 2023 Matti Vaittinen <[e-mail]>
+ */
+
+#ifndef __IIO_GTS_HELPER__
+#define __IIO_GTS_HELPER__
+
+#include <linux/types.h>
+
+struct device;
+
+/**
+ * struct iio_gain_sel_pair - gain - selector values
+ *
+ * In many cases devices like light sensors allow setting signal amplification
+ * (gain) using a register interface. This structure describes amplification
+ * and corresponding selector (register value)
+ *
+ * @gain:	Gain (multiplication) value. Gain must be positive, negative
+ *		values are reserved for error handling.
+ * @sel:	Selector (usually register value) used to indicate this gain.
+ *		NOTE: Only selectors >= 0 supported.
+ */
+struct iio_gain_sel_pair {
+	int gain;
+	int sel;
+};
+
+/**
+ * struct iio_itime_sel_mul - integration time description
+ *
+ * In many cases devices like light sensors allow setting the duration of
+ * collecting data. Typically this duration has also an impact to the magnitude
+ * of measured values (gain). This structure describes the relation of
+ * integration time and amplification as well as corresponding selector
+ * (register value).
+ *
+ * An example could be a sensor allowing 50, 100, 200 and 400 mS times. The
+ * respective multiplication values could be 50 mS => 1, 100 mS => 2,
+ * 200 mS => 4 and 400 mS => 8 assuming the impact of integration time would be
+ * linear in a way that when collecting data for 50 mS caused value X, doubling
+ * the data collection time caused value 2X etc.
+ *
+ * @time_us:	Integration time in microseconds. Time values must be positive,
+ *		negative values are reserved for error handling.
+ * @sel:	Selector (usually register value) used to indicate this time
+ *		NOTE: Only selectors >= 0 supported.
+ * @mul:	Multiplication to the values caused by this time.
+ *		NOTE: Only multipliers > 0 supported.
+ */
+struct iio_itime_sel_mul {
+	int time_us;
+	int sel;
+	int mul;
+};
+
+struct iio_gts {
+	u64 max_scale;
+	const struct iio_gain_sel_pair *hwgain_table;
+	int num_hwgain;
+	const struct iio_itime_sel_mul *itime_table;
+	int num_itime;
+	int **per_time_avail_scale_tables;
+	int *avail_all_scales_table;
+	int num_avail_all_scales;
+	int *avail_time_tables;
+	int num_avail_time_tables;
+};
+
+#define GAIN_SCALE_GAIN(_gain, _sel)			\
+{							\
+	.gain = (_gain),				\
+	.sel = (_sel),					\
+}
+
+#define GAIN_SCALE_ITIME_US(_itime, _sel, _mul)		\
+{							\
+	.time_us = (_itime),				\
+	.sel = (_sel),					\
+	.mul = (_mul),					\
+}
+
+static inline const struct iio_itime_sel_mul *
+iio_gts_find_itime_by_time(struct iio_gts *gts, int time)
+{
+	int i;
+
+	if (!gts->num_itime)
+		return NULL;
+
+	for (i = 0; i < gts->num_itime; i++)
+		if (gts->itime_table[i].time_us == time)
+			return &gts->itime_table[i];
+
+	return NULL;
+}
+
+static inline const struct iio_itime_sel_mul *
+iio_gts_find_itime_by_sel(struct iio_gts *gts, int sel)
+{
+	int i;
+
+	for (i = 0; i < gts->num_itime; i++)
+		if (gts->itime_table[i].sel == sel)
+			return &gts->itime_table[i];
+
+	return NULL;
+}
+
+int devm_iio_init_iio_gts(struct device *dev, int max_scale_int, int max_scale_nano,
+			  const struct iio_gain_sel_pair *gain_tbl, int num_gain,
+			  const struct iio_itime_sel_mul *tim_tbl, int num_times,
+			  struct iio_gts *gts);
+/**
+ * iio_gts_find_int_time_by_sel - find integration time matching a selector
+ * @gts:	Gain time scale descriptor
+ * @sel:	selector for which matching integration time is searched for
+ *
+ * Return:	integration time matching given selector or -EINVAL if
+ *		integration time was not found.
+ */
+static inline int iio_gts_find_int_time_by_sel(struct iio_gts *gts, int sel)
+{
+	const struct iio_itime_sel_mul *itime;
+
+	itime = iio_gts_find_itime_by_sel(gts, sel);
+	if (!itime)
+		return -EINVAL;
+
+	return itime->time_us;
+}
+
+/**
+ * iio_gts_find_sel_by_int_time - find selector matching integration time
+ * @gts:	Gain time scale descriptor
+ * @gain:	HW-gain for which matching selector is searched for
+ *
+ * Return:	a selector matching given integration time or -EINVAL if
+ *		selector was not found.
+ */
+static inline int iio_gts_find_sel_by_int_time(struct iio_gts *gts, int time)
+{
+	const struct iio_itime_sel_mul *itime;
+
+	itime = iio_gts_find_itime_by_time(gts, time);
+	if (!itime)
+		return -EINVAL;
+
+	return itime->sel;
+}
+
+/**
+ * iio_gts_valid_time - check if given integration time is valid
+ * @gts:	Gain time scale descriptor
+ * @time_us:	Integration time to check
+ *
+ * Return:	True if given time is supported by device. False if not.
+ */
+static inline bool iio_gts_valid_time(struct iio_gts *gts, int time_us)
+{
+	return iio_gts_find_itime_by_time(gts, time_us) != NULL;
+}
+
+int iio_gts_find_sel_by_gain(struct iio_gts *gts, int gain);
+
+/**
+ * iio_gts_valid_gain - check if given HW-gain is valid
+ * @gts:	Gain time scale descriptor
+ * @gain:	HW-gain to check
+ *
+ * Return:	True if given time is supported by device. False if not.
+ */
+static inline bool iio_gts_valid_gain(struct iio_gts *gts, int gain)
+{
+	return iio_gts_find_sel_by_gain(gts, gain) >= 0;
+}
+
+int iio_find_closest_gain_low(struct iio_gts *gts, int gain, bool *in_range);
+int iio_gts_find_gain_by_sel(struct iio_gts *gts, int sel);
+int iio_gts_get_min_gain(struct iio_gts *gts);
+int iio_gts_find_int_time_by_sel(struct iio_gts *gts, int sel);
+int iio_gts_find_sel_by_int_time(struct iio_gts *gts, int time);
+
+int iio_gts_total_gain_to_scale(struct iio_gts *gts, int total_gain,
+				int *scale_int, int *scale_nano);
+int iio_gts_find_gain_sel_for_scale_using_time(struct iio_gts *gts, int time_sel,
+					       int scale_int, int scale_nano,
+					       int *gain_sel);
+int iio_gts_get_scale(struct iio_gts *gts, int gain, int time, int *scale_int,
+		      int *scale_nano);
+int iio_gts_find_new_gain_sel_by_old_gain_time(struct iio_gts *gts,
+					       int old_gain, int old_time_sel,
+					       int new_time_sel, int *new_gain);
+int iio_gts_find_new_gain_by_old_gain_time(struct iio_gts *gts, int old_gain,
+					   int old_time, int new_time,
+					   int *new_gain);
+int iio_gts_avail_times(struct iio_gts *gts,  const int **vals, int *type,
+			int *length);
+int iio_gts_all_avail_scales(struct iio_gts *gts, const int **vals, int *type,
+			     int *length);
+int iio_gts_avail_scales_for_time(struct iio_gts *gts, int time,
+				  const int **vals, int *type, int *length);
+
+#endif

include/linux/iio/trigger.h

···
  **/
 int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig);
 
-/**
- * iio_trigger_poll() - called on a trigger occurring
- * @trig:	trigger which occurred
- *
- * Typically called in relevant hardware interrupt handler.
- **/
 void iio_trigger_poll(struct iio_trigger *trig);
-void iio_trigger_poll_chained(struct iio_trigger *trig);
+void iio_trigger_poll_nested(struct iio_trigger *trig);
 
 irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);