iio: pressure: driver for Honeywell HSC/SSC series

Adds driver for digital Honeywell TruStability HSC and SSC series
pressure and temperature sensors.
Communication is one way. The sensor only requires 4 bytes worth of
clock pulses on both i2c and spi in order to push the data out.
The i2c address is hardcoded and depends on the part number.
There is no additional GPIO control.
code is now based on iio/togreg

Datasheet:
https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf [HSC]
Datasheet:
https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-ssc-series/documents/sps-siot-trustability-ssc-series-standard-accuracy-board-mount-pressure-sensors-50099533-a-en-ciid-151134.pdf [SSC]

Signed-off-by: Petre Rodan <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

MAINTAINERS

···
 F:	mm/hmm*
 F:	tools/testing/selftests/mm/*hmm*
 
+HONEYWELL HSC030PA PRESSURE SENSOR SERIES IIO DRIVER
+M:	Petre Rodan <[e-mail]>
+L:	[e-mail]
+S:	Maintained
+F:	Documentation/devicetree/bindings/iio/pressure/honeywell,hsc030pa.yaml
+F:	drivers/iio/pressure/hsc030pa*
+
 HONEYWELL MPRLS0025PA PRESSURE SENSOR SERIES IIO DRIVER
 M:	Andreas Klinger <[e-mail]>
 L:	[e-mail]

drivers/iio/pressure/Kconfig

···
 	  To compile this driver as a module, choose M here: the module
 	  will be called hp03.
 
+config HSC030PA
+	tristate "Honeywell HSC/SSC TruStability pressure sensor series"
+	depends on (I2C || SPI_MASTER)
+	select HSC030PA_I2C if I2C
+	select HSC030PA_SPI if SPI_MASTER
+	help
+	  Say Y here to build support for the Honeywell TruStability
+	  HSC and SSC pressure and temperature sensor series.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called hsc030pa.
+
+config HSC030PA_I2C
+	tristate
+	depends on HSC030PA
+	depends on I2C
+
+config HSC030PA_SPI
+	tristate
+	depends on HSC030PA
+	depends on SPI_MASTER
+
 config ICP10100
 	tristate "InvenSense ICP-101xx pressure and temperature sensor"
 	depends on I2C

drivers/iio/pressure/Makefile

···
 obj-$(CONFIG_IIO_CROS_EC_BARO) += cros_ec_baro.o
 obj-$(CONFIG_HID_SENSOR_PRESS)   += hid-sensor-press.o
 obj-$(CONFIG_HP03) += hp03.o
+obj-$(CONFIG_HSC030PA) += hsc030pa.o
+obj-$(CONFIG_HSC030PA_I2C) += hsc030pa_i2c.o
+obj-$(CONFIG_HSC030PA_SPI) += hsc030pa_spi.o
 obj-$(CONFIG_ICP10100) += icp10100.o
 obj-$(CONFIG_MPL115) += mpl115.o
 obj-$(CONFIG_MPL115_I2C) += mpl115_i2c.o

drivers/iio/pressure/hsc030pa.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Honeywell TruStability HSC Series pressure/temperature sensor
+ *
+ * Copyright (c) 2023 Petre Rodan <[e-mail]>
+ *
+ * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf
+ */
+
+#include <linux/array_size.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/cleanup.h>
+#include <linux/init.h>
+#include <linux/math64.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include <asm/unaligned.h>
+
+#include "hsc030pa.h"
+
+/*
+ * HSC_PRESSURE_TRIPLET_LEN - length for the string that defines the
+ * pressure range, measurement unit and type as per the part nomenclature.
+ * Consult honeywell,pressure-triplet in the bindings file for details.
+ */
+#define HSC_PRESSURE_TRIPLET_LEN 6
+#define HSC_STATUS_MASK          GENMASK(7, 6)
+#define HSC_TEMPERATURE_MASK     GENMASK(15, 5)
+#define HSC_PRESSURE_MASK        GENMASK(29, 16)
+
+struct hsc_func_spec {
+	u32 output_min;
+	u32 output_max;
+};
+
+/*
+ * function A: 10% - 90% of 2^14
+ * function B:  5% - 95% of 2^14
+ * function C:  5% - 85% of 2^14
+ * function F:  4% - 94% of 2^14
+ */
+static const struct hsc_func_spec hsc_func_spec[] = {
+	[HSC_FUNCTION_A] = { .output_min = 1638, .output_max = 14746 },
+	[HSC_FUNCTION_B] = { .output_min =  819, .output_max = 15565 },
+	[HSC_FUNCTION_C] = { .output_min =  819, .output_max = 13926 },
+	[HSC_FUNCTION_F] = { .output_min =  655, .output_max = 15401 },
+};
+
+enum hsc_variants {
+	HSC001BA = 0x00, HSC1_6BA = 0x01, HSC2_5BA = 0x02, HSC004BA = 0x03,
+	HSC006BA = 0x04, HSC010BA = 0x05, HSC1_6MD = 0x06, HSC2_5MD = 0x07,
+	HSC004MD = 0x08, HSC006MD = 0x09, HSC010MD = 0x0a, HSC016MD = 0x0b,
+	HSC025MD = 0x0c, HSC040MD = 0x0d, HSC060MD = 0x0e, HSC100MD = 0x0f,
+	HSC160MD = 0x10, HSC250MD = 0x11, HSC400MD = 0x12, HSC600MD = 0x13,
+	HSC001BD = 0x14, HSC1_6BD = 0x15, HSC2_5BD = 0x16, HSC004BD = 0x17,
+	HSC2_5MG = 0x18, HSC004MG = 0x19, HSC006MG = 0x1a, HSC010MG = 0x1b,
+	HSC016MG = 0x1c, HSC025MG = 0x1d, HSC040MG = 0x1e, HSC060MG = 0x1f,
+	HSC100MG = 0x20, HSC160MG = 0x21, HSC250MG = 0x22, HSC400MG = 0x23,
+	HSC600MG = 0x24, HSC001BG = 0x25, HSC1_6BG = 0x26, HSC2_5BG = 0x27,
+	HSC004BG = 0x28, HSC006BG = 0x29, HSC010BG = 0x2a, HSC100KA = 0x2b,
+	HSC160KA = 0x2c, HSC250KA = 0x2d, HSC400KA = 0x2e, HSC600KA = 0x2f,
+	HSC001GA = 0x30, HSC160LD = 0x31, HSC250LD = 0x32, HSC400LD = 0x33,
+	HSC600LD = 0x34, HSC001KD = 0x35, HSC1_6KD = 0x36, HSC2_5KD = 0x37,
+	HSC004KD = 0x38, HSC006KD = 0x39, HSC010KD = 0x3a, HSC016KD = 0x3b,
+	HSC025KD = 0x3c, HSC040KD = 0x3d, HSC060KD = 0x3e, HSC100KD = 0x3f,
+	HSC160KD = 0x40, HSC250KD = 0x41, HSC400KD = 0x42, HSC250LG = 0x43,
+	HSC400LG = 0x44, HSC600LG = 0x45, HSC001KG = 0x46, HSC1_6KG = 0x47,
+	HSC2_5KG = 0x48, HSC004KG = 0x49, HSC006KG = 0x4a, HSC010KG = 0x4b,
+	HSC016KG = 0x4c, HSC025KG = 0x4d, HSC040KG = 0x4e, HSC060KG = 0x4f,
+	HSC100KG = 0x50, HSC160KG = 0x51, HSC250KG = 0x52, HSC400KG = 0x53,
+	HSC600KG = 0x54, HSC001GG = 0x55, HSC015PA = 0x56, HSC030PA = 0x57,
+	HSC060PA = 0x58, HSC100PA = 0x59, HSC150PA = 0x5a, HSC0_5ND = 0x5b,
+	HSC001ND = 0x5c, HSC002ND = 0x5d, HSC004ND = 0x5e, HSC005ND = 0x5f,
+	HSC010ND = 0x60, HSC020ND = 0x61, HSC030ND = 0x62, HSC001PD = 0x63,
+	HSC005PD = 0x64, HSC015PD = 0x65, HSC030PD = 0x66, HSC060PD = 0x67,
+	HSC001NG = 0x68, HSC002NG = 0x69, HSC004NG = 0x6a, HSC005NG = 0x6b,
+	HSC010NG = 0x6c, HSC020NG = 0x6d, HSC030NG = 0x6e, HSC001PG = 0x6f,
+	HSC005PG = 0x70, HSC015PG = 0x71, HSC030PG = 0x72, HSC060PG = 0x73,
+	HSC100PG = 0x74, HSC150PG = 0x75, HSC_VARIANTS_MAX
+};
+
+static const char * const hsc_triplet_variants[HSC_VARIANTS_MAX] = {
+	[HSC001BA] = "001BA", [HSC1_6BA] = "1.6BA", [HSC2_5BA] = "2.5BA",
+	[HSC004BA] = "004BA", [HSC006BA] = "006BA", [HSC010BA] = "010BA",
+	[HSC1_6MD] = "1.6MD", [HSC2_5MD] = "2.5MD", [HSC004MD] = "004MD",
+	[HSC006MD] = "006MD", [HSC010MD] = "010MD", [HSC016MD] = "016MD",
+	[HSC025MD] = "025MD", [HSC040MD] = "040MD", [HSC060MD] = "060MD",
+	[HSC100MD] = "100MD", [HSC160MD] = "160MD", [HSC250MD] = "250MD",
+	[HSC400MD] = "400MD", [HSC600MD] = "600MD", [HSC001BD] = "001BD",
+	[HSC1_6BD] = "1.6BD", [HSC2_5BD] = "2.5BD", [HSC004BD] = "004BD",
+	[HSC2_5MG] = "2.5MG", [HSC004MG] = "004MG", [HSC006MG] = "006MG",
+	[HSC010MG] = "010MG", [HSC016MG] = "016MG", [HSC025MG] = "025MG",
+	[HSC040MG] = "040MG", [HSC060MG] = "060MG", [HSC100MG] = "100MG",
+	[HSC160MG] = "160MG", [HSC250MG] = "250MG", [HSC400MG] = "400MG",
+	[HSC600MG] = "600MG", [HSC001BG] = "001BG", [HSC1_6BG] = "1.6BG",
+	[HSC2_5BG] = "2.5BG", [HSC004BG] = "004BG", [HSC006BG] = "006BG",
+	[HSC010BG] = "010BG", [HSC100KA] = "100KA", [HSC160KA] = "160KA",
+	[HSC250KA] = "250KA", [HSC400KA] = "400KA", [HSC600KA] = "600KA",
+	[HSC001GA] = "001GA", [HSC160LD] = "160LD", [HSC250LD] = "250LD",
+	[HSC400LD] = "400LD", [HSC600LD] = "600LD", [HSC001KD] = "001KD",
+	[HSC1_6KD] = "1.6KD", [HSC2_5KD] = "2.5KD", [HSC004KD] = "004KD",
+	[HSC006KD] = "006KD", [HSC010KD] = "010KD", [HSC016KD] = "016KD",
+	[HSC025KD] = "025KD", [HSC040KD] = "040KD", [HSC060KD] = "060KD",
+	[HSC100KD] = "100KD", [HSC160KD] = "160KD", [HSC250KD] = "250KD",
+	[HSC400KD] = "400KD", [HSC250LG] = "250LG", [HSC400LG] = "400LG",
+	[HSC600LG] = "600LG", [HSC001KG] = "001KG", [HSC1_6KG] = "1.6KG",
+	[HSC2_5KG] = "2.5KG", [HSC004KG] = "004KG", [HSC006KG] = "006KG",
+	[HSC010KG] = "010KG", [HSC016KG] = "016KG", [HSC025KG] = "025KG",
+	[HSC040KG] = "040KG", [HSC060KG] = "060KG", [HSC100KG] = "100KG",
+	[HSC160KG] = "160KG", [HSC250KG] = "250KG", [HSC400KG] = "400KG",
+	[HSC600KG] = "600KG", [HSC001GG] = "001GG", [HSC015PA] = "015PA",
+	[HSC030PA] = "030PA", [HSC060PA] = "060PA", [HSC100PA] = "100PA",
+	[HSC150PA] = "150PA", [HSC0_5ND] = "0.5ND", [HSC001ND] = "001ND",
+	[HSC002ND] = "002ND", [HSC004ND] = "004ND", [HSC005ND] = "005ND",
+	[HSC010ND] = "010ND", [HSC020ND] = "020ND", [HSC030ND] = "030ND",
+	[HSC001PD] = "001PD", [HSC005PD] = "005PD", [HSC015PD] = "015PD",
+	[HSC030PD] = "030PD", [HSC060PD] = "060PD", [HSC001NG] = "001NG",
+	[HSC002NG] = "002NG", [HSC004NG] = "004NG", [HSC005NG] = "005NG",
+	[HSC010NG] = "010NG", [HSC020NG] = "020NG", [HSC030NG] = "030NG",
+	[HSC001PG] = "001PG", [HSC005PG] = "005PG", [HSC015PG] = "015PG",
+	[HSC030PG] = "030PG", [HSC060PG] = "060PG", [HSC100PG] = "100PG",
+	[HSC150PG] = "150PG",
+};
+
+/**
+ * struct hsc_range_config - list of pressure ranges based on nomenclature
+ * @pmin: lowest pressure that can be measured
+ * @pmax: highest pressure that can be measured
+ */
+struct hsc_range_config {
+	const s32 pmin;
+	const s32 pmax;
+};
+
+/* All min max limits have been converted to pascals */
+static const struct hsc_range_config hsc_range_config[HSC_VARIANTS_MAX] = {
+	[HSC001BA] = { .pmin =       0, .pmax =  100000 },
+	[HSC1_6BA] = { .pmin =       0, .pmax =  160000 },
+	[HSC2_5BA] = { .pmin =       0, .pmax =  250000 },
+	[HSC004BA] = { .pmin =       0, .pmax =  400000 },
+	[HSC006BA] = { .pmin =       0, .pmax =  600000 },
+	[HSC010BA] = { .pmin =       0, .pmax = 1000000 },
+	[HSC1_6MD] = { .pmin =    -160, .pmax =     160 },
+	[HSC2_5MD] = { .pmin =    -250, .pmax =     250 },
+	[HSC004MD] = { .pmin =    -400, .pmax =     400 },
+	[HSC006MD] = { .pmin =    -600, .pmax =     600 },
+	[HSC010MD] = { .pmin =   -1000, .pmax =    1000 },
+	[HSC016MD] = { .pmin =   -1600, .pmax =    1600 },
+	[HSC025MD] = { .pmin =   -2500, .pmax =    2500 },
+	[HSC040MD] = { .pmin =   -4000, .pmax =    4000 },
+	[HSC060MD] = { .pmin =   -6000, .pmax =    6000 },
+	[HSC100MD] = { .pmin =  -10000, .pmax =   10000 },
+	[HSC160MD] = { .pmin =  -16000, .pmax =   16000 },
+	[HSC250MD] = { .pmin =  -25000, .pmax =   25000 },
+	[HSC400MD] = { .pmin =  -40000, .pmax =   40000 },
+	[HSC600MD] = { .pmin =  -60000, .pmax =   60000 },
+	[HSC001BD] = { .pmin = -100000, .pmax =  100000 },
+	[HSC1_6BD] = { .pmin = -160000, .pmax =  160000 },
+	[HSC2_5BD] = { .pmin = -250000, .pmax =  250000 },
+	[HSC004BD] = { .pmin = -400000, .pmax =  400000 },
+	[HSC2_5MG] = { .pmin =       0, .pmax =     250 },
+	[HSC004MG] = { .pmin =       0, .pmax =     400 },
+	[HSC006MG] = { .pmin =       0, .pmax =     600 },
+	[HSC010MG] = { .pmin =       0, .pmax =    1000 },
+	[HSC016MG] = { .pmin =       0, .pmax =    1600 },
+	[HSC025MG] = { .pmin =       0, .pmax =    2500 },
+	[HSC040MG] = { .pmin =       0, .pmax =    4000 },
+	[HSC060MG] = { .pmin =       0, .pmax =    6000 },
+	[HSC100MG] = { .pmin =       0, .pmax =   10000 },
+	[HSC160MG] = { .pmin =       0, .pmax =   16000 },
+	[HSC250MG] = { .pmin =       0, .pmax =   25000 },
+	[HSC400MG] = { .pmin =       0, .pmax =   40000 },
+	[HSC600MG] = { .pmin =       0, .pmax =   60000 },
+	[HSC001BG] = { .pmin =       0, .pmax =  100000 },
+	[HSC1_6BG] = { .pmin =       0, .pmax =  160000 },
+	[HSC2_5BG] = { .pmin =       0, .pmax =  250000 },
+	[HSC004BG] = { .pmin =       0, .pmax =  400000 },
+	[HSC006BG] = { .pmin =       0, .pmax =  600000 },
+	[HSC010BG] = { .pmin =       0, .pmax = 1000000 },
+	[HSC100KA] = { .pmin =       0, .pmax =  100000 },
+	[HSC160KA] = { .pmin =       0, .pmax =  160000 },
+	[HSC250KA] = { .pmin =       0, .pmax =  250000 },
+	[HSC400KA] = { .pmin =       0, .pmax =  400000 },
+	[HSC600KA] = { .pmin =       0, .pmax =  600000 },
+	[HSC001GA] = { .pmin =       0, .pmax = 1000000 },
+	[HSC160LD] = { .pmin =    -160, .pmax =     160 },
+	[HSC250LD] = { .pmin =    -250, .pmax =     250 },
+	[HSC400LD] = { .pmin =    -400, .pmax =     400 },
+	[HSC600LD] = { .pmin =    -600, .pmax =     600 },
+	[HSC001KD] = { .pmin =   -1000, .pmax =    1000 },
+	[HSC1_6KD] = { .pmin =   -1600, .pmax =    1600 },
+	[HSC2_5KD] = { .pmin =   -2500, .pmax =    2500 },
+	[HSC004KD] = { .pmin =   -4000, .pmax =    4000 },
+	[HSC006KD] = { .pmin =   -6000, .pmax =    6000 },
+	[HSC010KD] = { .pmin =  -10000, .pmax =   10000 },
+	[HSC016KD] = { .pmin =  -16000, .pmax =   16000 },
+	[HSC025KD] = { .pmin =  -25000, .pmax =   25000 },
+	[HSC040KD] = { .pmin =  -40000, .pmax =   40000 },
+	[HSC060KD] = { .pmin =  -60000, .pmax =   60000 },
+	[HSC100KD] = { .pmin = -100000, .pmax =  100000 },
+	[HSC160KD] = { .pmin = -160000, .pmax =  160000 },
+	[HSC250KD] = { .pmin = -250000, .pmax =  250000 },
+	[HSC400KD] = { .pmin = -400000, .pmax =  400000 },
+	[HSC250LG] = { .pmin =       0, .pmax =     250 },
+	[HSC400LG] = { .pmin =       0, .pmax =     400 },
+	[HSC600LG] = { .pmin =       0, .pmax =     600 },
+	[HSC001KG] = { .pmin =       0, .pmax =    1000 },
+	[HSC1_6KG] = { .pmin =       0, .pmax =    1600 },
+	[HSC2_5KG] = { .pmin =       0, .pmax =    2500 },
+	[HSC004KG] = { .pmin =       0, .pmax =    4000 },
+	[HSC006KG] = { .pmin =       0, .pmax =    6000 },
+	[HSC010KG] = { .pmin =       0, .pmax =   10000 },
+	[HSC016KG] = { .pmin =       0, .pmax =   16000 },
+	[HSC025KG] = { .pmin =       0, .pmax =   25000 },
+	[HSC040KG] = { .pmin =       0, .pmax =   40000 },
+	[HSC060KG] = { .pmin =       0, .pmax =   60000 },
+	[HSC100KG] = { .pmin =       0, .pmax =  100000 },
+	[HSC160KG] = { .pmin =       0, .pmax =  160000 },
+	[HSC250KG] = { .pmin =       0, .pmax =  250000 },
+	[HSC400KG] = { .pmin =       0, .pmax =  400000 },
+	[HSC600KG] = { .pmin =       0, .pmax =  600000 },
+	[HSC001GG] = { .pmin =       0, .pmax = 1000000 },
+	[HSC015PA] = { .pmin =       0, .pmax =  103421 },
+	[HSC030PA] = { .pmin =       0, .pmax =  206843 },
+	[HSC060PA] = { .pmin =       0, .pmax =  413685 },
+	[HSC100PA] = { .pmin =       0, .pmax =  689476 },
+	[HSC150PA] = { .pmin =       0, .pmax = 1034214 },
+	[HSC0_5ND] = { .pmin =    -125, .pmax =     125 },
+	[HSC001ND] = { .pmin =    -249, .pmax =     249 },
+	[HSC002ND] = { .pmin =    -498, .pmax =     498 },
+	[HSC004ND] = { .pmin =    -996, .pmax =     996 },
+	[HSC005ND] = { .pmin =   -1245, .pmax =    1245 },
+	[HSC010ND] = { .pmin =   -2491, .pmax =    2491 },
+	[HSC020ND] = { .pmin =   -4982, .pmax =    4982 },
+	[HSC030ND] = { .pmin =   -7473, .pmax =    7473 },
+	[HSC001PD] = { .pmin =   -6895, .pmax =    6895 },
+	[HSC005PD] = { .pmin =  -34474, .pmax =   34474 },
+	[HSC015PD] = { .pmin = -103421, .pmax =  103421 },
+	[HSC030PD] = { .pmin = -206843, .pmax =  206843 },
+	[HSC060PD] = { .pmin = -413685, .pmax =  413685 },
+	[HSC001NG] = { .pmin =       0, .pmax =     249 },
+	[HSC002NG] = { .pmin =       0, .pmax =     498 },
+	[HSC004NG] = { .pmin =       0, .pmax =     996 },
+	[HSC005NG] = { .pmin =       0, .pmax =    1245 },
+	[HSC010NG] = { .pmin =       0, .pmax =    2491 },
+	[HSC020NG] = { .pmin =       0, .pmax =    4982 },
+	[HSC030NG] = { .pmin =       0, .pmax =    7473 },
+	[HSC001PG] = { .pmin =       0, .pmax =    6895 },
+	[HSC005PG] = { .pmin =       0, .pmax =   34474 },
+	[HSC015PG] = { .pmin =       0, .pmax =  103421 },
+	[HSC030PG] = { .pmin =       0, .pmax =  206843 },
+	[HSC060PG] = { .pmin =       0, .pmax =  413685 },
+	[HSC100PG] = { .pmin =       0, .pmax =  689476 },
+	[HSC150PG] = { .pmin =       0, .pmax = 1034214 },
+};
+
+/**
+ * hsc_measurement_is_valid() - validate last conversion via status bits
+ * @data: structure containing instantiated sensor data
+ * Return: true only if both status bits are zero
+ *
+ * the two MSB from the first transfered byte contain a status code
+ *   00 - normal operation, valid data
+ *   01 - device in factory programming mode
+ *   10 - stale data
+ *   11 - diagnostic condition
+ */
+static bool hsc_measurement_is_valid(struct hsc_data *data)
+{
+	return !(data->buffer[0] & HSC_STATUS_MASK);
+}
+
+static int hsc_get_measurement(struct hsc_data *data)
+{
+	const struct hsc_chip_data *chip = data->chip;
+	int ret;
+
+	ret = data->recv_cb(data);
+	if (ret < 0)
+		return ret;
+
+	data->is_valid = chip->valid(data);
+	if (!data->is_valid)
+		return -EAGAIN;
+
+	return 0;
+}
+
+/*
+ * IIO ABI expects
+ * value = (conv + offset) * scale
+ *
+ * datasheet provides the following formula for determining the temperature
+ * temp[C] = conv * a + b
+ *   where a = 200/2047; b = -50
+ *
+ *  temp[C] = (conv + (b/a)) * a * (1000)
+ *  =>
+ *  scale = a * 1000 = .097703957 * 1000 = 97.703957
+ *  offset = b/a = -50 / .097703957 = -50000000 / 97704
+ *
+ *  based on the datasheet
+ *  pressure = (conv - Omin) * Q + Pmin =
+ *          ((conv - Omin) + Pmin/Q) * Q
+ *  =>
+ *  scale = Q = (Pmax - Pmin) / (Omax - Omin)
+ *  offset = Pmin/Q - Omin = Pmin * (Omax - Omin) / (Pmax - Pmin) - Omin
+ */
+static int hsc_read_raw(struct iio_dev *indio_dev,
+			struct iio_chan_spec const *channel, int *val,
+			int *val2, long mask)
+{
+	struct hsc_data *data = iio_priv(indio_dev);
+	int ret;
+	u32 recvd;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = hsc_get_measurement(data);
+		if (ret)
+			return ret;
+
+		recvd = get_unaligned_be32(data->buffer);
+		switch (channel->type) {
+		case IIO_PRESSURE:
+			*val = FIELD_GET(HSC_PRESSURE_MASK, recvd);
+			return IIO_VAL_INT;
+		case IIO_TEMP:
+			*val = FIELD_GET(HSC_TEMPERATURE_MASK, recvd);
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+
+	case IIO_CHAN_INFO_SCALE:
+		switch (channel->type) {
+		case IIO_TEMP:
+			*val = 97;
+			*val2 = 703957;
+			return IIO_VAL_INT_PLUS_MICRO;
+		case IIO_PRESSURE:
+			*val = data->p_scale;
+			*val2 = data->p_scale_dec;
+			return IIO_VAL_INT_PLUS_NANO;
+		default:
+			return -EINVAL;
+		}
+
+	case IIO_CHAN_INFO_OFFSET:
+		switch (channel->type) {
+		case IIO_TEMP:
+			*val = -50000000;
+			*val2 = 97704;
+			return IIO_VAL_FRACTIONAL;
+		case IIO_PRESSURE:
+			*val = data->p_offset;
+			*val2 = data->p_offset_dec;
+			return IIO_VAL_INT_PLUS_MICRO;
+		default:
+			return -EINVAL;
+		}
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_chan_spec hsc_channels[] = {
+	{
+		.type = IIO_PRESSURE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OFFSET),
+	},
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OFFSET),
+	},
+};
+
+static const struct iio_info hsc_info = {
+	.read_raw = hsc_read_raw,
+};
+
+static const struct hsc_chip_data hsc_chip = {
+	.valid = hsc_measurement_is_valid,
+	.channels = hsc_channels,
+	.num_channels = ARRAY_SIZE(hsc_channels),
+};
+
+int hsc_common_probe(struct device *dev, hsc_recv_fn recv)
+{
+	struct hsc_data *hsc;
+	struct iio_dev *indio_dev;
+	const char *triplet;
+	u64 tmp;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*hsc));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	hsc = iio_priv(indio_dev);
+
+	hsc->chip = &hsc_chip;
+	hsc->recv_cb = recv;
+	hsc->dev = dev;
+
+	ret = device_property_read_u32(dev, "honeywell,transfer-function",
+				       &hsc->function);
+	if (ret)
+		return dev_err_probe(dev, ret,
+			    "honeywell,transfer-function could not be read\n");
+	if (hsc->function > HSC_FUNCTION_F)
+		return dev_err_probe(dev, -EINVAL,
+				     "honeywell,transfer-function %d invalid\n",
+				     hsc->function);
+
+	ret = device_property_read_string(dev, "honeywell,pressure-triplet",
+					  &triplet);
+	if (ret)
+		return dev_err_probe(dev, ret,
+			     "honeywell,pressure-triplet could not be read\n");
+
+	if (str_has_prefix(triplet, "NA")) {
+		ret = device_property_read_u32(dev, "honeywell,pmin-pascal",
+					       &hsc->pmin);
+		if (ret)
+			return dev_err_probe(dev, ret,
+				  "honeywell,pmin-pascal could not be read\n");
+
+		ret = device_property_read_u32(dev, "honeywell,pmax-pascal",
+					       &hsc->pmax);
+		if (ret)
+			return dev_err_probe(dev, ret,
+				  "honeywell,pmax-pascal could not be read\n");
+	} else {
+		ret = device_property_match_property_string(dev,
+						  "honeywell,pressure-triplet",
+						  hsc_triplet_variants,
+						  HSC_VARIANTS_MAX);
+		if (ret < 0)
+			return dev_err_probe(dev, -EINVAL,
+				    "honeywell,pressure-triplet is invalid\n");
+
+		hsc->pmin = hsc_range_config[ret].pmin;
+		hsc->pmax = hsc_range_config[ret].pmax;
+	}
+
+	if (hsc->pmin >= hsc->pmax)
+		return dev_err_probe(dev, -EINVAL,
+				     "pressure limits are invalid\n");
+
+	ret = devm_regulator_get_enable(dev, "vdd");
+	if (ret)
+		return dev_err_probe(dev, ret, "can't get vdd supply\n");
+
+	hsc->outmin = hsc_func_spec[hsc->function].output_min;
+	hsc->outmax = hsc_func_spec[hsc->function].output_max;
+
+	tmp = div_s64(((s64)(hsc->pmax - hsc->pmin)) * MICRO,
+		      hsc->outmax - hsc->outmin);
+	hsc->p_scale = div_s64_rem(tmp, NANO, &hsc->p_scale_dec);
+	tmp = div_s64(((s64)hsc->pmin * (s64)(hsc->outmax - hsc->outmin)) * MICRO,
+		      hsc->pmax - hsc->pmin);
+	tmp -= (s64)hsc->outmin * MICRO;
+	hsc->p_offset = div_s64_rem(tmp, MICRO, &hsc->p_offset_dec);
+
+	indio_dev->name = "hsc030pa";
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &hsc_info;
+	indio_dev->channels = hsc->chip->channels;
+	indio_dev->num_channels = hsc->chip->num_channels;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+EXPORT_SYMBOL_NS(hsc_common_probe, IIO_HONEYWELL_HSC030PA);
+
+MODULE_AUTHOR("Petre Rodan <[e-mail]>");
+MODULE_DESCRIPTION("Honeywell HSC and SSC pressure sensor core driver");
+MODULE_LICENSE("GPL");

drivers/iio/pressure/hsc030pa.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Honeywell TruStability HSC Series pressure/temperature sensor
+ *
+ * Copyright (c) 2023 Petre Rodan <[e-mail]>
+ */
+
+#ifndef _HSC030PA_H
+#define _HSC030PA_H
+
+#include <linux/types.h>
+
+#define HSC_REG_MEASUREMENT_RD_SIZE 4
+
+struct device;
+
+struct iio_chan_spec;
+struct iio_dev;
+
+struct hsc_data;
+struct hsc_chip_data;
+
+typedef int (*hsc_recv_fn)(struct hsc_data *);
+
+/**
+ * struct hsc_data
+ * @dev: current device structure
+ * @chip: structure containing chip's channel properties
+ * @recv_cb: function that implements the chip reads
+ * @is_valid: true if last transfer has been validated
+ * @pmin: minimum measurable pressure limit
+ * @pmax: maximum measurable pressure limit
+ * @outmin: minimum raw pressure in counts (based on transfer function)
+ * @outmax: maximum raw pressure in counts (based on transfer function)
+ * @function: transfer function
+ * @p_scale: pressure scale
+ * @p_scale_dec: pressure scale, decimal places
+ * @p_offset: pressure offset
+ * @p_offset_dec: pressure offset, decimal places
+ * @buffer: raw conversion data
+ */
+struct hsc_data {
+	struct device *dev;
+	const struct hsc_chip_data *chip;
+	hsc_recv_fn recv_cb;
+	bool is_valid;
+	s32 pmin;
+	s32 pmax;
+	u32 outmin;
+	u32 outmax;
+	u32 function;
+	s64 p_scale;
+	s32 p_scale_dec;
+	s64 p_offset;
+	s32 p_offset_dec;
+	u8 buffer[HSC_REG_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN);
+};
+
+struct hsc_chip_data {
+	bool (*valid)(struct hsc_data *data);
+	const struct iio_chan_spec *channels;
+	u8 num_channels;
+};
+
+enum hsc_func_id {
+	HSC_FUNCTION_A,
+	HSC_FUNCTION_B,
+	HSC_FUNCTION_C,
+	HSC_FUNCTION_F,
+};
+
+int hsc_common_probe(struct device *dev, hsc_recv_fn recv);
+
+#endif

drivers/iio/pressure/hsc030pa_i2c.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Honeywell TruStability HSC Series pressure/temperature sensor
+ *
+ * Copyright (c) 2023 Petre Rodan <[e-mail]>
+ *
+ * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf [hsc]
+ * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/common/documents/sps-siot-i2c-comms-digital-output-pressure-sensors-tn-008201-3-en-ciid-45841.pdf [i2c related]
+ */
+
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+
+#include <linux/iio/iio.h>
+
+#include "hsc030pa.h"
+
+static int hsc_i2c_recv(struct hsc_data *data)
+{
+	struct i2c_client *client = to_i2c_client(data->dev);
+	struct i2c_msg msg;
+	int ret;
+
+	msg.addr = client->addr;
+	msg.flags = client->flags | I2C_M_RD;
+	msg.len = HSC_REG_MEASUREMENT_RD_SIZE;
+	msg.buf = data->buffer;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+
+	return (ret == 2) ? 0 : ret;
+}
+
+static int hsc_i2c_probe(struct i2c_client *client)
+{
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+		return -EOPNOTSUPP;
+
+	return hsc_common_probe(&client->dev, hsc_i2c_recv);
+}
+
+static const struct of_device_id hsc_i2c_match[] = {
+	{ .compatible = "honeywell,hsc030pa" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, hsc_i2c_match);
+
+static const struct i2c_device_id hsc_i2c_id[] = {
+	{ "hsc030pa" },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, hsc_i2c_id);
+
+static struct i2c_driver hsc_i2c_driver = {
+	.driver = {
+		.name = "hsc030pa",
+		.of_match_table = hsc_i2c_match,
+	},
+	.probe = hsc_i2c_probe,
+	.id_table = hsc_i2c_id,
+};
+module_i2c_driver(hsc_i2c_driver);
+
+MODULE_AUTHOR("Petre Rodan <[e-mail]>");
+MODULE_DESCRIPTION("Honeywell HSC and SSC pressure sensor i2c driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_HONEYWELL_HSC030PA);

drivers/iio/pressure/hsc030pa_spi.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Honeywell TruStability HSC Series pressure/temperature sensor
+ *
+ * Copyright (c) 2023 Petre Rodan <[e-mail]>
+ *
+ * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/stddef.h>
+
+#include <linux/iio/iio.h>
+
+#include "hsc030pa.h"
+
+static int hsc_spi_recv(struct hsc_data *data)
+{
+	struct spi_device *spi = to_spi_device(data->dev);
+	struct spi_transfer xfer = {
+		.tx_buf = NULL,
+		.rx_buf = data->buffer,
+		.len = HSC_REG_MEASUREMENT_RD_SIZE,
+	};
+
+	return spi_sync_transfer(spi, &xfer, 1);
+}
+
+static int hsc_spi_probe(struct spi_device *spi)
+{
+	return hsc_common_probe(&spi->dev, hsc_spi_recv);
+}
+
+static const struct of_device_id hsc_spi_match[] = {
+	{ .compatible = "honeywell,hsc030pa" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, hsc_spi_match);
+
+static const struct spi_device_id hsc_spi_id[] = {
+	{ "hsc030pa" },
+	{}
+};
+MODULE_DEVICE_TABLE(spi, hsc_spi_id);
+
+static struct spi_driver hsc_spi_driver = {
+	.driver = {
+		.name = "hsc030pa",
+		.of_match_table = hsc_spi_match,
+	},
+	.probe = hsc_spi_probe,
+	.id_table = hsc_spi_id,
+};
+module_spi_driver(hsc_spi_driver);
+
+MODULE_AUTHOR("Petre Rodan <[e-mail]>");
+MODULE_DESCRIPTION("Honeywell HSC and SSC pressure sensor spi driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_HONEYWELL_HSC030PA);