Merge branch 'next' into for-linus

Prepare second round of input updates for 4.3 merge window.

Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt

···
-* Texas Instruments tsc2005 touchscreen controller
+* Texas Instruments tsc2004 and tsc2005 touchscreen controllers
 
 Required properties:
- - compatible		      : "ti,tsc2005"
- - reg			      : SPI device address
- - spi-max-frequency	      : Maximal SPI speed
+ - compatible		      : "ti,tsc2004" or "ti,tsc2005"
+ - reg			      : Device address
  - interrupts		      : IRQ specifier
- - reset-gpios		      : GPIO specifier
- - vio-supply                 : Regulator specifier
+ - spi-max-frequency	      : Maximum SPI clocking speed of the device
+			        (for tsc2005)
 
 Optional properties:
+ - vio-supply		      : Regulator specifier
+ - reset-gpios		      : GPIO specifier for the controller reset line
  - ti,x-plate-ohms	      : integer, resistance of the touchscreen's X plates
 				in ohm (defaults to 280)
  - ti,esd-recovery-timeout-ms : integer, if the touchscreen does not respond after
···
  - properties defined in touchscreen.txt
 
 Example:
+
+&i2c3 {
+	tsc2004@48 {
+		compatible = "ti,tsc2004";
+		reg = <0x48>;
+		vio-supply = <&vio>;
+
+		reset-gpios = <&gpio4 8 GPIO_ACTIVE_HIGH>;
+		interrupts-extended = <&gpio1 27 IRQ_TYPE_EDGE_RISING>;
+
+		touchscreen-fuzz-x = <4>;
+		touchscreen-fuzz-y = <7>;
+		touchscreen-fuzz-pressure = <2>;
+		touchscreen-size-x = <4096>;
+		touchscreen-size-y = <4096>;
+		touchscreen-max-pressure = <2048>;
+
+		ti,x-plate-ohms = <280>;
+		ti,esd-recovery-timeout-ms = <8000>;
+	};
+}
 
 &mcspi1 {
 	tsc2005@0 {

drivers/input/mouse/elantech.c

···
 			DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"),
 		},
 	},
+	{
+		/* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"),
+		},
+	},
 #endif
 	{ }
 };

drivers/input/serio/parkbd.c

···
 	return 0;
 }
 
-static struct serio * __init parkbd_allocate_serio(void)
+static struct serio *parkbd_allocate_serio(void)
 {
 	struct serio *serio;
 

drivers/input/touchscreen/Kconfig

···
 	  To compile this driver as a module, choose M here: the
 	  module will be called tsc40.
 
+config TOUCHSCREEN_TSC200X_CORE
+	tristate
+
+config TOUCHSCREEN_TSC2004
+	tristate "TSC2004 based touchscreens"
+	depends on I2C
+	select REGMAP_I2C
+	select TOUCHSCREEN_TSC200X_CORE
+	help
+	  Say Y here if you have a TSC2004 based touchscreen.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called tsc2004.
+
 config TOUCHSCREEN_TSC2005
 	tristate "TSC2005 based touchscreens"
 	depends on SPI_MASTER
 	select REGMAP_SPI
+	select TOUCHSCREEN_TSC200X_CORE
 	help
 	  Say Y here if you have a TSC2005 based touchscreen.
 

drivers/input/touchscreen/Makefile

···
 obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)	+= touchright.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)	+= touchwin.o
 obj-$(CONFIG_TOUCHSCREEN_TSC_SERIO)	+= tsc40.o
+obj-$(CONFIG_TOUCHSCREEN_TSC200X_CORE)	+= tsc200x-core.o
+obj-$(CONFIG_TOUCHSCREEN_TSC2004)	+= tsc2004.o
 obj-$(CONFIG_TOUCHSCREEN_TSC2005)	+= tsc2005.o
 obj-$(CONFIG_TOUCHSCREEN_TSC2007)	+= tsc2007.o
 obj-$(CONFIG_TOUCHSCREEN_UCB1400)	+= ucb1400_ts.o

drivers/input/touchscreen/tsc2004.c

···
+/*
+ * TSC2004 touchscreen driver
+ *
+ * Copyright (C) 2015 QWERTY Embedded Design
+ * Copyright (C) 2015 EMAC Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/of.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include "tsc200x-core.h"
+
+static int tsc2004_cmd(struct device *dev, u8 cmd)
+{
+	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
+	s32 data;
+	struct i2c_client *i2c = to_i2c_client(dev);
+
+	data = i2c_smbus_write_byte(i2c, tx);
+	if (data < 0) {
+		dev_err(dev, "%s: failed, command: %x i2c error: %d\n",
+			__func__, cmd, data);
+		return data;
+	}
+
+	return 0;
+}
+
+static int tsc2004_probe(struct i2c_client *i2c,
+			 const struct i2c_device_id *id)
+
+{
+	return tsc200x_probe(&i2c->dev, i2c->irq, BUS_I2C,
+			     devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
+			     tsc2004_cmd);
+}
+
+static int tsc2004_remove(struct i2c_client *i2c)
+{
+	return tsc200x_remove(&i2c->dev);
+}
+
+static const struct i2c_device_id tsc2004_idtable[] = {
+	{ "tsc2004", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
+
+#ifdef CONFIG_OF
+static const struct of_device_id tsc2004_of_match[] = {
+	{ .compatible = "ti,tsc2004" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, tsc2004_of_match);
+#endif
+
+static struct i2c_driver tsc2004_driver = {
+	.driver = {
+		.name   = "tsc2004",
+		.of_match_table = of_match_ptr(tsc2004_of_match),
+		.pm     = &tsc200x_pm_ops,
+	},
+	.id_table       = tsc2004_idtable,
+	.probe          = tsc2004_probe,
+	.remove         = tsc2004_remove,
+};
+module_i2c_driver(tsc2004_driver);
+
+MODULE_AUTHOR("Michael Welling <[e-mail]>");
+MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
+MODULE_LICENSE("GPL");

drivers/input/touchscreen/tsc2005.c

···
  * TSC2005 touchscreen driver
  *
  * Copyright (C) 2006-2010 Nokia Corporation
+ * Copyright (C) 2015 QWERTY Embedded Design
+ * Copyright (C) 2015 EMAC Inc.
  *
- * Author: Lauri Leukkunen <[e-mail]>
- * based on TSC2301 driver by Klaus K. Pedersen <[e-mail]>
+ * Based on original tsc2005.c by Lauri Leukkunen <[e-mail]>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
···
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
  */
 
-#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/input.h>
-#include <linux/input/touchscreen.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/pm.h>
-#include <linux/of.h>
 #include <linux/spi/spi.h>
-#include <linux/spi/tsc2005.h>
-#include <linux/regulator/consumer.h>
 #include <linux/regmap.h>
-#include <linux/gpio/consumer.h>
+#include "tsc200x-core.h"
 
-/*
- * The touchscreen interface operates as follows:
- *
- * 1) Pen is pressed against the touchscreen.
- * 2) TSC2005 performs AD conversion.
- * 3) After the conversion is done TSC2005 drives DAV line down.
- * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
- * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
- *    values.
- * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
- *    tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
- * 7) When the penup timer expires, there have not been touch or DAV interrupts
- *    during the last 40ms which means the pen has been lifted.
- *
- * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
- * after a configurable period (in ms) of activity. If esd_timeout is 0, the
- * watchdog is disabled.
- */
-
-/* control byte 1 */
-#define TSC2005_CMD			0x80
-#define TSC2005_CMD_NORMAL		0x00
-#define TSC2005_CMD_STOP		0x01
-#define TSC2005_CMD_12BIT		0x04
-
-/* control byte 0 */
-#define TSC2005_REG_READ		0x01 /* R/W access */
-#define TSC2005_REG_PND0		0x02 /* Power Not Down Control */
-#define TSC2005_REG_X			(0x0 << 3)
-#define TSC2005_REG_Y			(0x1 << 3)
-#define TSC2005_REG_Z1			(0x2 << 3)
-#define TSC2005_REG_Z2			(0x3 << 3)
-#define TSC2005_REG_AUX			(0x4 << 3)
-#define TSC2005_REG_TEMP1		(0x5 << 3)
-#define TSC2005_REG_TEMP2		(0x6 << 3)
-#define TSC2005_REG_STATUS		(0x7 << 3)
-#define TSC2005_REG_AUX_HIGH		(0x8 << 3)
-#define TSC2005_REG_AUX_LOW		(0x9 << 3)
-#define TSC2005_REG_TEMP_HIGH		(0xA << 3)
-#define TSC2005_REG_TEMP_LOW		(0xB << 3)
-#define TSC2005_REG_CFR0		(0xC << 3)
-#define TSC2005_REG_CFR1		(0xD << 3)
-#define TSC2005_REG_CFR2		(0xE << 3)
-#define TSC2005_REG_CONV_FUNC		(0xF << 3)
-
-/* configuration register 0 */
-#define TSC2005_CFR0_PRECHARGE_276US	0x0040
-#define TSC2005_CFR0_STABTIME_1MS	0x0300
-#define TSC2005_CFR0_CLOCK_1MHZ		0x1000
-#define TSC2005_CFR0_RESOLUTION12	0x2000
-#define TSC2005_CFR0_PENMODE		0x8000
-#define TSC2005_CFR0_INITVALUE		(TSC2005_CFR0_STABTIME_1MS    | \
-					 TSC2005_CFR0_CLOCK_1MHZ      | \
-					 TSC2005_CFR0_RESOLUTION12    | \
-					 TSC2005_CFR0_PRECHARGE_276US | \
-					 TSC2005_CFR0_PENMODE)
-
-/* bits common to both read and write of configuration register 0 */
-#define	TSC2005_CFR0_RW_MASK		0x3fff
-
-/* configuration register 1 */
-#define TSC2005_CFR1_BATCHDELAY_4MS	0x0003
-#define TSC2005_CFR1_INITVALUE		TSC2005_CFR1_BATCHDELAY_4MS
-
-/* configuration register 2 */
-#define TSC2005_CFR2_MAVE_Z		0x0004
-#define TSC2005_CFR2_MAVE_Y		0x0008
-#define TSC2005_CFR2_MAVE_X		0x0010
-#define TSC2005_CFR2_AVG_7		0x0800
-#define TSC2005_CFR2_MEDIUM_15		0x3000
-#define TSC2005_CFR2_INITVALUE		(TSC2005_CFR2_MAVE_X	| \
-					 TSC2005_CFR2_MAVE_Y	| \
-					 TSC2005_CFR2_MAVE_Z	| \
-					 TSC2005_CFR2_MEDIUM_15	| \
-					 TSC2005_CFR2_AVG_7)
-
-#define MAX_12BIT			0xfff
-#define TSC2005_DEF_X_FUZZ		4
-#define TSC2005_DEF_Y_FUZZ		8
-#define TSC2005_DEF_P_FUZZ		2
-#define TSC2005_DEF_RESISTOR		280
-
-#define TSC2005_SPI_MAX_SPEED_HZ	10000000
-#define TSC2005_PENUP_TIME_MS		40
-
-static const struct regmap_range tsc2005_writable_ranges[] = {
-	regmap_reg_range(TSC2005_REG_AUX_HIGH, TSC2005_REG_CFR2),
-};
-
-static const struct regmap_access_table tsc2005_writable_table = {
-	.yes_ranges = tsc2005_writable_ranges,
-	.n_yes_ranges = ARRAY_SIZE(tsc2005_writable_ranges),
-};
-
-static struct regmap_config tsc2005_regmap_config = {
-	.reg_bits = 8,
-	.val_bits = 16,
-	.reg_stride = 0x08,
-	.max_register = 0x78,
-	.read_flag_mask = TSC2005_REG_READ,
-	.write_flag_mask = TSC2005_REG_PND0,
-	.wr_table = &tsc2005_writable_table,
-	.use_single_rw = true,
-};
-
-struct tsc2005_data {
-	u16 x;
-	u16 y;
-	u16 z1;
-	u16 z2;
-} __packed;
-#define TSC2005_DATA_REGS 4
-
-struct tsc2005 {
-	struct spi_device	*spi;
-	struct regmap		*regmap;
-
-	struct input_dev	*idev;
-	char			phys[32];
-
-	struct mutex		mutex;
-
-	/* raw copy of previous x,y,z */
-	int			in_x;
-	int			in_y;
-	int                     in_z1;
-	int			in_z2;
-
-	spinlock_t		lock;
-	struct timer_list	penup_timer;
-
-	unsigned int		esd_timeout;
-	struct delayed_work	esd_work;
-	unsigned long		last_valid_interrupt;
-
-	unsigned int		x_plate_ohm;
-
-	bool			opened;
-	bool			suspended;
-
-	bool			pen_down;
-
-	struct regulator	*vio;
-
-	struct gpio_desc	*reset_gpio;
-	void			(*set_reset)(bool enable);
-};
-
-static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
+static int tsc2005_cmd(struct device *dev, u8 cmd)
 {
-	u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
+	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
 	struct spi_transfer xfer = {
-		.tx_buf		= &tx,
-		.len		= 1,
-		.bits_per_word	= 8,
+		.tx_buf         = &tx,
+		.len            = 1,
+		.bits_per_word  = 8,
 	};
 	struct spi_message msg;
+	struct spi_device *spi = to_spi_device(dev);
 	int error;
 
 	spi_message_init(&msg);
 	spi_message_add_tail(&xfer, &msg);
 
-	error = spi_sync(ts->spi, &msg);
+	error = spi_sync(spi, &msg);
 	if (error) {
-		dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n",
+		dev_err(dev, "%s: failed, command: %x, spi error: %d\n",
 			__func__, cmd, error);
 		return error;
 	}
···
 	return 0;
 }
 
-static void tsc2005_update_pen_state(struct tsc2005 *ts,
-				     int x, int y, int pressure)
-{
-	if (pressure) {
-		input_report_abs(ts->idev, ABS_X, x);
-		input_report_abs(ts->idev, ABS_Y, y);
-		input_report_abs(ts->idev, ABS_PRESSURE, pressure);
-		if (!ts->pen_down) {
-			input_report_key(ts->idev, BTN_TOUCH, !!pressure);
-			ts->pen_down = true;
-		}
-	} else {
-		input_report_abs(ts->idev, ABS_PRESSURE, 0);
-		if (ts->pen_down) {
-			input_report_key(ts->idev, BTN_TOUCH, 0);
-			ts->pen_down = false;
-		}
-	}
-	input_sync(ts->idev);
-	dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
-		pressure);
-}
-
-static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
-{
-	struct tsc2005 *ts = _ts;
-	unsigned long flags;
-	unsigned int pressure;
-	struct tsc2005_data tsdata;
-	int error;
-
-	/* read the coordinates */
-	error = regmap_bulk_read(ts->regmap, TSC2005_REG_X, &tsdata,
-				 TSC2005_DATA_REGS);
-	if (unlikely(error))
-		goto out;
-
-	/* validate position */
-	if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT))
-		goto out;
-
-	/* Skip reading if the pressure components are out of range */
-	if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT))
-		goto out;
-	if (unlikely(tsdata.z1 >= tsdata.z2))
-		goto out;
-
-       /*
-	* Skip point if this is a pen down with the exact same values as
-	* the value before pen-up - that implies SPI fed us stale data
-	*/
-	if (!ts->pen_down &&
-	    ts->in_x == tsdata.x && ts->in_y == tsdata.y &&
-	    ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) {
-		goto out;
-	}
-
-	/*
-	 * At this point we are happy we have a valid and useful reading.
-	 * Remember it for later comparisons. We may now begin downsampling.
-	 */
-	ts->in_x = tsdata.x;
-	ts->in_y = tsdata.y;
-	ts->in_z1 = tsdata.z1;
-	ts->in_z2 = tsdata.z2;
-
-	/* Compute touch pressure resistance using equation #1 */
-	pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1;
-	pressure = pressure * ts->x_plate_ohm / 4096;
-	if (unlikely(pressure > MAX_12BIT))
-		goto out;
-
-	spin_lock_irqsave(&ts->lock, flags);
-
-	tsc2005_update_pen_state(ts, tsdata.x, tsdata.y, pressure);
-	mod_timer(&ts->penup_timer,
-		  jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
-
-	spin_unlock_irqrestore(&ts->lock, flags);
-
-	ts->last_valid_interrupt = jiffies;
-out:
-	return IRQ_HANDLED;
-}
-
-static void tsc2005_penup_timer(unsigned long data)
-{
-	struct tsc2005 *ts = (struct tsc2005 *)data;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ts->lock, flags);
-	tsc2005_update_pen_state(ts, 0, 0, 0);
-	spin_unlock_irqrestore(&ts->lock, flags);
-}
-
-static void tsc2005_start_scan(struct tsc2005 *ts)
-{
-	regmap_write(ts->regmap, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
-	regmap_write(ts->regmap, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
-	regmap_write(ts->regmap, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
-	tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
-}
-
-static void tsc2005_stop_scan(struct tsc2005 *ts)
-{
-	tsc2005_cmd(ts, TSC2005_CMD_STOP);
-}
-
-static void tsc2005_set_reset(struct tsc2005 *ts, bool enable)
-{
-	if (ts->reset_gpio)
-		gpiod_set_value_cansleep(ts->reset_gpio, enable);
-	else if (ts->set_reset)
-		ts->set_reset(enable);
-}
-
-/* must be called with ts->mutex held */
-static void __tsc2005_disable(struct tsc2005 *ts)
-{
-	tsc2005_stop_scan(ts);
-
-	disable_irq(ts->spi->irq);
-	del_timer_sync(&ts->penup_timer);
-
-	cancel_delayed_work_sync(&ts->esd_work);
-
-	enable_irq(ts->spi->irq);
-}
-
-/* must be called with ts->mutex held */
-static void __tsc2005_enable(struct tsc2005 *ts)
-{
-	tsc2005_start_scan(ts);
-
-	if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) {
-		ts->last_valid_interrupt = jiffies;
-		schedule_delayed_work(&ts->esd_work,
-				round_jiffies_relative(
-					msecs_to_jiffies(ts->esd_timeout)));
-	}
-
-}
-
-static ssize_t tsc2005_selftest_show(struct device *dev,
-				     struct device_attribute *attr,
-				     char *buf)
-{
-	struct tsc2005 *ts = dev_get_drvdata(dev);
-	unsigned int temp_high;
-	unsigned int temp_high_orig;
-	unsigned int temp_high_test;
-	bool success = true;
-	int error;
-
-	mutex_lock(&ts->mutex);
-
-	/*
-	 * Test TSC2005 communications via temp high register.
-	 */
-	__tsc2005_disable(ts);
-
-	error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
-	if (error) {
-		dev_warn(dev, "selftest failed: read error %d\n", error);
-		success = false;
-		goto out;
-	}
-
-	temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
-
-	error = regmap_write(ts->regmap, TSC2005_REG_TEMP_HIGH, temp_high_test);
-	if (error) {
-		dev_warn(dev, "selftest failed: write error %d\n", error);
-		success = false;
-		goto out;
-	}
-
-	error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high);
-	if (error) {
-		dev_warn(dev, "selftest failed: read error %d after write\n",
-			 error);
-		success = false;
-		goto out;
-	}
-
-	if (temp_high != temp_high_test) {
-		dev_warn(dev, "selftest failed: %d != %d\n",
-			 temp_high, temp_high_test);
-		success = false;
-	}
-
-	/* hardware reset */
-	tsc2005_set_reset(ts, false);
-	usleep_range(100, 500); /* only 10us required */
-	tsc2005_set_reset(ts, true);
-
-	if (!success)
-		goto out;
-
-	/* test that the reset really happened */
-	error = regmap_read(ts->regmap, TSC2005_REG_TEMP_HIGH, &temp_high);
-	if (error) {
-		dev_warn(dev, "selftest failed: read error %d after reset\n",
-			 error);
-		success = false;
-		goto out;
-	}
-
-	if (temp_high != temp_high_orig) {
-		dev_warn(dev, "selftest failed after reset: %d != %d\n",
-			 temp_high, temp_high_orig);
-		success = false;
-	}
-
-out:
-	__tsc2005_enable(ts);
-	mutex_unlock(&ts->mutex);
-
-	return sprintf(buf, "%d\n", success);
-}
-
-static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
-
-static struct attribute *tsc2005_attrs[] = {
-	&dev_attr_selftest.attr,
-	NULL
-};
-
-static umode_t tsc2005_attr_is_visible(struct kobject *kobj,
-				      struct attribute *attr, int n)
-{
-	struct device *dev = container_of(kobj, struct device, kobj);
-	struct tsc2005 *ts = dev_get_drvdata(dev);
-	umode_t mode = attr->mode;
-
-	if (attr == &dev_attr_selftest.attr) {
-		if (!ts->set_reset && !ts->reset_gpio)
-			mode = 0;
-	}
-
-	return mode;
-}
-
-static const struct attribute_group tsc2005_attr_group = {
-	.is_visible	= tsc2005_attr_is_visible,
-	.attrs		= tsc2005_attrs,
-};
-
-static void tsc2005_esd_work(struct work_struct *work)
-{
-	struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work);
-	int error;
-	unsigned int r;
-
-	if (!mutex_trylock(&ts->mutex)) {
-		/*
-		 * If the mutex is taken, it means that disable or enable is in
-		 * progress. In that case just reschedule the work. If the work
-		 * is not needed, it will be canceled by disable.
-		 */
-		goto reschedule;
-	}
-
-	if (time_is_after_jiffies(ts->last_valid_interrupt +
-				  msecs_to_jiffies(ts->esd_timeout)))
-		goto out;
-
-	/* We should be able to read register without disabling interrupts. */
-	error = regmap_read(ts->regmap, TSC2005_REG_CFR0, &r);
-	if (!error &&
-	    !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) {
-		goto out;
-	}
-
-	/*
-	 * If we could not read our known value from configuration register 0
-	 * then we should reset the controller as if from power-up and start
-	 * scanning again.
-	 */
-	dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
-
-	disable_irq(ts->spi->irq);
-	del_timer_sync(&ts->penup_timer);
-
-	tsc2005_update_pen_state(ts, 0, 0, 0);
-
-	tsc2005_set_reset(ts, false);
-	usleep_range(100, 500); /* only 10us required */
-	tsc2005_set_reset(ts, true);
-
-	enable_irq(ts->spi->irq);
-	tsc2005_start_scan(ts);
-
-out:
-	mutex_unlock(&ts->mutex);
-reschedule:
-	/* re-arm the watchdog */
-	schedule_delayed_work(&ts->esd_work,
-			      round_jiffies_relative(
-					msecs_to_jiffies(ts->esd_timeout)));
-}
-
-static int tsc2005_open(struct input_dev *input)
-{
-	struct tsc2005 *ts = input_get_drvdata(input);
-
-	mutex_lock(&ts->mutex);
-
-	if (!ts->suspended)
-		__tsc2005_enable(ts);
-
-	ts->opened = true;
-
-	mutex_unlock(&ts->mutex);
-
-	return 0;
-}
-
-static void tsc2005_close(struct input_dev *input)
-{
-	struct tsc2005 *ts = input_get_drvdata(input);
-
-	mutex_lock(&ts->mutex);
-
-	if (!ts->suspended)
-		__tsc2005_disable(ts);
-
-	ts->opened = false;
-
-	mutex_unlock(&ts->mutex);
-}
-
 static int tsc2005_probe(struct spi_device *spi)
 {
-	const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev);
-	struct device_node *np = spi->dev.of_node;
-
-	struct tsc2005 *ts;
-	struct input_dev *input_dev;
-	unsigned int max_x = MAX_12BIT;
-	unsigned int max_y = MAX_12BIT;
-	unsigned int max_p = MAX_12BIT;
-	unsigned int fudge_x = TSC2005_DEF_X_FUZZ;
-	unsigned int fudge_y = TSC2005_DEF_Y_FUZZ;
-	unsigned int fudge_p = TSC2005_DEF_P_FUZZ;
-	unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR;
-	unsigned int esd_timeout;
 	int error;
-
-	if (!np && !pdata) {
-		dev_err(&spi->dev, "no platform data\n");
-		return -ENODEV;
-	}
-
-	if (spi->irq <= 0) {
-		dev_err(&spi->dev, "no irq\n");
-		return -ENODEV;
-	}
-
-	if (pdata) {
-		fudge_x	= pdata->ts_x_fudge;
-		fudge_y	= pdata->ts_y_fudge;
-		fudge_p	= pdata->ts_pressure_fudge;
-		max_x	= pdata->ts_x_max;
-		max_y	= pdata->ts_y_max;
-		max_p	= pdata->ts_pressure_max;
-		x_plate_ohm = pdata->ts_x_plate_ohm;
-		esd_timeout = pdata->esd_timeout_ms;
-	} else {
-		x_plate_ohm = TSC2005_DEF_RESISTOR;
-		of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm);
-		esd_timeout = 0;
-		of_property_read_u32(np, "ti,esd-recovery-timeout-ms",
-								&esd_timeout);
-	}
 
 	spi->mode = SPI_MODE_0;
 	spi->bits_per_word = 8;
···
 	if (error)
 		return error;
 
-	ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL);
-	if (!ts)
-		return -ENOMEM;
-
-	input_dev = devm_input_allocate_device(&spi->dev);
-	if (!input_dev)
-		return -ENOMEM;
-
-	ts->spi = spi;
-	ts->idev = input_dev;
-
-	ts->regmap = devm_regmap_init_spi(spi, &tsc2005_regmap_config);
-	if (IS_ERR(ts->regmap))
-		return PTR_ERR(ts->regmap);
-
-	ts->x_plate_ohm = x_plate_ohm;
-	ts->esd_timeout = esd_timeout;
-
-	ts->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
-						 GPIOD_OUT_HIGH);
-	if (IS_ERR(ts->reset_gpio)) {
-		error = PTR_ERR(ts->reset_gpio);
-		dev_err(&spi->dev, "error acquiring reset gpio: %d\n", error);
-		return error;
-	}
-
-	ts->vio = devm_regulator_get_optional(&spi->dev, "vio");
-	if (IS_ERR(ts->vio)) {
-		error = PTR_ERR(ts->vio);
-		dev_err(&spi->dev, "vio regulator missing (%d)", error);
-		return error;
-	}
-
-	if (!ts->reset_gpio && pdata)
-		ts->set_reset = pdata->set_reset;
-
-	mutex_init(&ts->mutex);
-
-	spin_lock_init(&ts->lock);
-	setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
-
-	INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work);
-
-	snprintf(ts->phys, sizeof(ts->phys),
-		 "%s/input-ts", dev_name(&spi->dev));
-
-	input_dev->name = "TSC2005 touchscreen";
-	input_dev->phys = ts->phys;
-	input_dev->id.bustype = BUS_SPI;
-	input_dev->dev.parent = &spi->dev;
-	input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
-	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
-
-	input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
-	input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
-	input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
-
-	if (np)
-		touchscreen_parse_properties(input_dev, false);
-
-	input_dev->open = tsc2005_open;
-	input_dev->close = tsc2005_close;
-
-	input_set_drvdata(input_dev, ts);
-
-	/* Ensure the touchscreen is off */
-	tsc2005_stop_scan(ts);
-
-	error = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
-					  tsc2005_irq_thread,
-					  IRQF_TRIGGER_RISING | IRQF_ONESHOT,
-					  "tsc2005", ts);
-	if (error) {
-		dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
-		return error;
-	}
-
-	/* enable regulator for DT */
-	if (ts->vio) {
-		error = regulator_enable(ts->vio);
-		if (error)
-			return error;
-	}
-
-	dev_set_drvdata(&spi->dev, ts);
-	error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
-	if (error) {
-		dev_err(&spi->dev,
-			"Failed to create sysfs attributes, err: %d\n", error);
-		goto disable_regulator;
-	}
-
-	error = input_register_device(ts->idev);
-	if (error) {
-		dev_err(&spi->dev,
-			"Failed to register input device, err: %d\n", error);
-		goto err_remove_sysfs;
-	}
-
-	irq_set_irq_wake(spi->irq, 1);
-	return 0;
-
-err_remove_sysfs:
-	sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
-disable_regulator:
-	if (ts->vio)
-		regulator_disable(ts->vio);
-	return error;
+	return tsc200x_probe(&spi->dev, spi->irq, BUS_SPI,
+			     devm_regmap_init_spi(spi, &tsc200x_regmap_config),
+			     tsc2005_cmd);
 }
 
 static int tsc2005_remove(struct spi_device *spi)
 {
-	struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
-
-	sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
-
-	if (ts->vio)
-		regulator_disable(ts->vio);
-
-	return 0;
+	return tsc200x_remove(&spi->dev);
 }
-
-static int __maybe_unused tsc2005_suspend(struct device *dev)
-{
-	struct tsc2005 *ts = dev_get_drvdata(dev);
-
-	mutex_lock(&ts->mutex);
-
-	if (!ts->suspended && ts->opened)
-		__tsc2005_disable(ts);
-
-	ts->suspended = true;
-
-	mutex_unlock(&ts->mutex);
-
-	return 0;
-}
-
-static int __maybe_unused tsc2005_resume(struct device *dev)
-{
-	struct tsc2005 *ts = dev_get_drvdata(dev);
-
-	mutex_lock(&ts->mutex);
-
-	if (ts->suspended && ts->opened)
-		__tsc2005_enable(ts);
-
-	ts->suspended = false;
-
-	mutex_unlock(&ts->mutex);
-
-	return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
 
 static struct spi_driver tsc2005_driver = {
 	.driver	= {
 		.name	= "tsc2005",
 		.owner	= THIS_MODULE,
-		.pm	= &tsc2005_pm_ops,
+		.pm	= &tsc200x_pm_ops,
 	},
 	.probe	= tsc2005_probe,
 	.remove	= tsc2005_remove,
 };
-
 module_spi_driver(tsc2005_driver);
 
-MODULE_AUTHOR("Lauri Leukkunen <[e-mail]>");
+MODULE_AUTHOR("Michael Welling <[e-mail]>");
 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("spi:tsc2005");

drivers/input/touchscreen/tsc200x-core.c

···
+/*
+ * TSC2004/TSC2005 touchscreen driver core
+ *
+ * Copyright (C) 2006-2010 Nokia Corporation
+ * Copyright (C) 2015 QWERTY Embedded Design
+ * Copyright (C) 2015 EMAC Inc.
+ *
+ * Author: Lauri Leukkunen <[e-mail]>
+ * based on TSC2301 driver by Klaus K. Pedersen <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/of.h>
+#include <linux/spi/tsc2005.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regmap.h>
+#include <linux/gpio/consumer.h>
+#include "tsc200x-core.h"
+
+/*
+ * The touchscreen interface operates as follows:
+ *
+ * 1) Pen is pressed against the touchscreen.
+ * 2) TSC200X performs AD conversion.
+ * 3) After the conversion is done TSC200X drives DAV line down.
+ * 4) GPIO IRQ is received and tsc200x_irq_thread() is scheduled.
+ * 5) tsc200x_irq_thread() queues up a transfer to fetch the x, y, z1, z2
+ *    values.
+ * 6) tsc200x_irq_thread() reports coordinates to input layer and sets up
+ *    tsc200x_penup_timer() to be called after TSC200X_PENUP_TIME_MS (40ms).
+ * 7) When the penup timer expires, there have not been touch or DAV interrupts
+ *    during the last 40ms which means the pen has been lifted.
+ *
+ * ESD recovery via a hardware reset is done if the TSC200X doesn't respond
+ * after a configurable period (in ms) of activity. If esd_timeout is 0, the
+ * watchdog is disabled.
+ */
+
+static const struct regmap_range tsc200x_writable_ranges[] = {
+	regmap_reg_range(TSC200X_REG_AUX_HIGH, TSC200X_REG_CFR2),
+};
+
+static const struct regmap_access_table tsc200x_writable_table = {
+	.yes_ranges = tsc200x_writable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(tsc200x_writable_ranges),
+};
+
+const struct regmap_config tsc200x_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+	.reg_stride = 0x08,
+	.max_register = 0x78,
+	.read_flag_mask = TSC200X_REG_READ,
+	.write_flag_mask = TSC200X_REG_PND0,
+	.wr_table = &tsc200x_writable_table,
+	.use_single_rw = true,
+};
+EXPORT_SYMBOL_GPL(tsc200x_regmap_config);
+
+struct tsc200x_data {
+	u16 x;
+	u16 y;
+	u16 z1;
+	u16 z2;
+} __packed;
+#define TSC200X_DATA_REGS 4
+
+struct tsc200x {
+	struct device           *dev;
+	struct regmap		*regmap;
+	__u16                   bustype;
+
+	struct input_dev	*idev;
+	char			phys[32];
+
+	struct mutex		mutex;
+
+	/* raw copy of previous x,y,z */
+	int			in_x;
+	int			in_y;
+	int                     in_z1;
+	int			in_z2;
+
+	spinlock_t		lock;
+	struct timer_list	penup_timer;
+
+	unsigned int		esd_timeout;
+	struct delayed_work	esd_work;
+	unsigned long		last_valid_interrupt;
+
+	unsigned int		x_plate_ohm;
+
+	bool			opened;
+	bool			suspended;
+
+	bool			pen_down;
+
+	struct regulator	*vio;
+
+	struct gpio_desc	*reset_gpio;
+	void			(*set_reset)(bool enable);
+	int			(*tsc200x_cmd)(struct device *dev, u8 cmd);
+	int			irq;
+};
+
+static void tsc200x_update_pen_state(struct tsc200x *ts,
+				     int x, int y, int pressure)
+{
+	if (pressure) {
+		input_report_abs(ts->idev, ABS_X, x);
+		input_report_abs(ts->idev, ABS_Y, y);
+		input_report_abs(ts->idev, ABS_PRESSURE, pressure);
+		if (!ts->pen_down) {
+			input_report_key(ts->idev, BTN_TOUCH, !!pressure);
+			ts->pen_down = true;
+		}
+	} else {
+		input_report_abs(ts->idev, ABS_PRESSURE, 0);
+		if (ts->pen_down) {
+			input_report_key(ts->idev, BTN_TOUCH, 0);
+			ts->pen_down = false;
+		}
+	}
+	input_sync(ts->idev);
+	dev_dbg(ts->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
+		pressure);
+}
+
+static irqreturn_t tsc200x_irq_thread(int irq, void *_ts)
+{
+	struct tsc200x *ts = _ts;
+	unsigned long flags;
+	unsigned int pressure;
+	struct tsc200x_data tsdata;
+	int error;
+
+	/* read the coordinates */
+	error = regmap_bulk_read(ts->regmap, TSC200X_REG_X, &tsdata,
+				 TSC200X_DATA_REGS);
+	if (unlikely(error))
+		goto out;
+
+	/* validate position */
+	if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT))
+		goto out;
+
+	/* Skip reading if the pressure components are out of range */
+	if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT))
+		goto out;
+	if (unlikely(tsdata.z1 >= tsdata.z2))
+		goto out;
+
+       /*
+	* Skip point if this is a pen down with the exact same values as
+	* the value before pen-up - that implies SPI fed us stale data
+	*/
+	if (!ts->pen_down &&
+	    ts->in_x == tsdata.x && ts->in_y == tsdata.y &&
+	    ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) {
+		goto out;
+	}
+
+	/*
+	 * At this point we are happy we have a valid and useful reading.
+	 * Remember it for later comparisons. We may now begin downsampling.
+	 */
+	ts->in_x = tsdata.x;
+	ts->in_y = tsdata.y;
+	ts->in_z1 = tsdata.z1;
+	ts->in_z2 = tsdata.z2;
+
+	/* Compute touch pressure resistance using equation #1 */
+	pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1;
+	pressure = pressure * ts->x_plate_ohm / 4096;
+	if (unlikely(pressure > MAX_12BIT))
+		goto out;
+
+	spin_lock_irqsave(&ts->lock, flags);
+
+	tsc200x_update_pen_state(ts, tsdata.x, tsdata.y, pressure);
+	mod_timer(&ts->penup_timer,
+		  jiffies + msecs_to_jiffies(TSC200X_PENUP_TIME_MS));
+
+	spin_unlock_irqrestore(&ts->lock, flags);
+
+	ts->last_valid_interrupt = jiffies;
+out:
+	return IRQ_HANDLED;
+}
+
+static void tsc200x_penup_timer(unsigned long data)
+{
+	struct tsc200x *ts = (struct tsc200x *)data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ts->lock, flags);
+	tsc200x_update_pen_state(ts, 0, 0, 0);
+	spin_unlock_irqrestore(&ts->lock, flags);
+}
+
+static void tsc200x_start_scan(struct tsc200x *ts)
+{
+	regmap_write(ts->regmap, TSC200X_REG_CFR0, TSC200X_CFR0_INITVALUE);
+	regmap_write(ts->regmap, TSC200X_REG_CFR1, TSC200X_CFR1_INITVALUE);
+	regmap_write(ts->regmap, TSC200X_REG_CFR2, TSC200X_CFR2_INITVALUE);
+	ts->tsc200x_cmd(ts->dev, TSC200X_CMD_NORMAL);
+}
+
+static void tsc200x_stop_scan(struct tsc200x *ts)
+{
+	ts->tsc200x_cmd(ts->dev, TSC200X_CMD_STOP);
+}
+
+static void tsc200x_set_reset(struct tsc200x *ts, bool enable)
+{
+	if (ts->reset_gpio)
+		gpiod_set_value_cansleep(ts->reset_gpio, enable);
+	else if (ts->set_reset)
+		ts->set_reset(enable);
+}
+
+/* must be called with ts->mutex held */
+static void __tsc200x_disable(struct tsc200x *ts)
+{
+	tsc200x_stop_scan(ts);
+
+	disable_irq(ts->irq);
+	del_timer_sync(&ts->penup_timer);
+
+	cancel_delayed_work_sync(&ts->esd_work);
+
+	enable_irq(ts->irq);
+}
+
+/* must be called with ts->mutex held */
+static void __tsc200x_enable(struct tsc200x *ts)
+{
+	tsc200x_start_scan(ts);
+
+	if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) {
+		ts->last_valid_interrupt = jiffies;
+		schedule_delayed_work(&ts->esd_work,
+				round_jiffies_relative(
+					msecs_to_jiffies(ts->esd_timeout)));
+	}
+}
+
+static ssize_t tsc200x_selftest_show(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	struct tsc200x *ts = dev_get_drvdata(dev);
+	unsigned int temp_high;
+	unsigned int temp_high_orig;
+	unsigned int temp_high_test;
+	bool success = true;
+	int error;
+
+	mutex_lock(&ts->mutex);
+
+	/*
+	 * Test TSC200X communications via temp high register.
+	 */
+	__tsc200x_disable(ts);
+
+	error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high_orig);
+	if (error) {
+		dev_warn(dev, "selftest failed: read error %d\n", error);
+		success = false;
+		goto out;
+	}
+
+	temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
+
+	error = regmap_write(ts->regmap, TSC200X_REG_TEMP_HIGH, temp_high_test);
+	if (error) {
+		dev_warn(dev, "selftest failed: write error %d\n", error);
+		success = false;
+		goto out;
+	}
+
+	error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high);
+	if (error) {
+		dev_warn(dev, "selftest failed: read error %d after write\n",
+			 error);
+		success = false;
+		goto out;
+	}
+
+	if (temp_high != temp_high_test) {
+		dev_warn(dev, "selftest failed: %d != %d\n",
+			 temp_high, temp_high_test);
+		success = false;
+	}
+
+	/* hardware reset */
+	tsc200x_set_reset(ts, false);
+	usleep_range(100, 500); /* only 10us required */
+	tsc200x_set_reset(ts, true);
+
+	if (!success)
+		goto out;
+
+	/* test that the reset really happened */
+	error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high);
+	if (error) {
+		dev_warn(dev, "selftest failed: read error %d after reset\n",
+			 error);
+		success = false;
+		goto out;
+	}
+
+	if (temp_high != temp_high_orig) {
+		dev_warn(dev, "selftest failed after reset: %d != %d\n",
+			 temp_high, temp_high_orig);
+		success = false;
+	}
+
+out:
+	__tsc200x_enable(ts);
+	mutex_unlock(&ts->mutex);
+
+	return sprintf(buf, "%d\n", success);
+}
+
+static DEVICE_ATTR(selftest, S_IRUGO, tsc200x_selftest_show, NULL);
+
+static struct attribute *tsc200x_attrs[] = {
+	&dev_attr_selftest.attr,
+	NULL
+};
+
+static umode_t tsc200x_attr_is_visible(struct kobject *kobj,
+				      struct attribute *attr, int n)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct tsc200x *ts = dev_get_drvdata(dev);
+	umode_t mode = attr->mode;
+
+	if (attr == &dev_attr_selftest.attr) {
+		if (!ts->set_reset && !ts->reset_gpio)
+			mode = 0;
+	}
+
+	return mode;
+}
+
+static const struct attribute_group tsc200x_attr_group = {
+	.is_visible	= tsc200x_attr_is_visible,
+	.attrs		= tsc200x_attrs,
+};
+
+static void tsc200x_esd_work(struct work_struct *work)
+{
+	struct tsc200x *ts = container_of(work, struct tsc200x, esd_work.work);
+	int error;
+	unsigned int r;
+
+	if (!mutex_trylock(&ts->mutex)) {
+		/*
+		 * If the mutex is taken, it means that disable or enable is in
+		 * progress. In that case just reschedule the work. If the work
+		 * is not needed, it will be canceled by disable.
+		 */
+		goto reschedule;
+	}
+
+	if (time_is_after_jiffies(ts->last_valid_interrupt +
+				  msecs_to_jiffies(ts->esd_timeout)))
+		goto out;
+
+	/* We should be able to read register without disabling interrupts. */
+	error = regmap_read(ts->regmap, TSC200X_REG_CFR0, &r);
+	if (!error &&
+	    !((r ^ TSC200X_CFR0_INITVALUE) & TSC200X_CFR0_RW_MASK)) {
+		goto out;
+	}
+
+	/*
+	 * If we could not read our known value from configuration register 0
+	 * then we should reset the controller as if from power-up and start
+	 * scanning again.
+	 */
+	dev_info(ts->dev, "TSC200X not responding - resetting\n");
+
+	disable_irq(ts->irq);
+	del_timer_sync(&ts->penup_timer);
+
+	tsc200x_update_pen_state(ts, 0, 0, 0);
+
+	tsc200x_set_reset(ts, false);
+	usleep_range(100, 500); /* only 10us required */
+	tsc200x_set_reset(ts, true);
+
+	enable_irq(ts->irq);
+	tsc200x_start_scan(ts);
+
+out:
+	mutex_unlock(&ts->mutex);
+reschedule:
+	/* re-arm the watchdog */
+	schedule_delayed_work(&ts->esd_work,
+			      round_jiffies_relative(
+					msecs_to_jiffies(ts->esd_timeout)));
+}
+
+static int tsc200x_open(struct input_dev *input)
+{
+	struct tsc200x *ts = input_get_drvdata(input);
+
+	mutex_lock(&ts->mutex);
+
+	if (!ts->suspended)
+		__tsc200x_enable(ts);
+
+	ts->opened = true;
+
+	mutex_unlock(&ts->mutex);
+
+	return 0;
+}
+
+static void tsc200x_close(struct input_dev *input)
+{
+	struct tsc200x *ts = input_get_drvdata(input);
+
+	mutex_lock(&ts->mutex);
+
+	if (!ts->suspended)
+		__tsc200x_disable(ts);
+
+	ts->opened = false;
+
+	mutex_unlock(&ts->mutex);
+}
+
+int tsc200x_probe(struct device *dev, int irq, __u16 bustype,
+		  struct regmap *regmap,
+		  int (*tsc200x_cmd)(struct device *dev, u8 cmd))
+{
+	const struct tsc2005_platform_data *pdata = dev_get_platdata(dev);
+	struct device_node *np = dev->of_node;
+
+	struct tsc200x *ts;
+	struct input_dev *input_dev;
+	unsigned int max_x = MAX_12BIT;
+	unsigned int max_y = MAX_12BIT;
+	unsigned int max_p = MAX_12BIT;
+	unsigned int fudge_x = TSC200X_DEF_X_FUZZ;
+	unsigned int fudge_y = TSC200X_DEF_Y_FUZZ;
+	unsigned int fudge_p = TSC200X_DEF_P_FUZZ;
+	unsigned int x_plate_ohm = TSC200X_DEF_RESISTOR;
+	unsigned int esd_timeout;
+	int error;
+
+	if (!np && !pdata) {
+		dev_err(dev, "no platform data\n");
+		return -ENODEV;
+	}
+
+	if (irq <= 0) {
+		dev_err(dev, "no irq\n");
+		return -ENODEV;
+	}
+
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	if (!tsc200x_cmd) {
+		dev_err(dev, "no cmd function\n");
+		return -ENODEV;
+	}
+
+	if (pdata) {
+		fudge_x	= pdata->ts_x_fudge;
+		fudge_y	= pdata->ts_y_fudge;
+		fudge_p	= pdata->ts_pressure_fudge;
+		max_x	= pdata->ts_x_max;
+		max_y	= pdata->ts_y_max;
+		max_p	= pdata->ts_pressure_max;
+		x_plate_ohm = pdata->ts_x_plate_ohm;
+		esd_timeout = pdata->esd_timeout_ms;
+	} else {
+		x_plate_ohm = TSC200X_DEF_RESISTOR;
+		of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm);
+		esd_timeout = 0;
+		of_property_read_u32(np, "ti,esd-recovery-timeout-ms",
+								&esd_timeout);
+	}
+
+	ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	input_dev = devm_input_allocate_device(dev);
+	if (!input_dev)
+		return -ENOMEM;
+
+	ts->irq = irq;
+	ts->dev = dev;
+	ts->idev = input_dev;
+	ts->regmap = regmap;
+	ts->tsc200x_cmd = tsc200x_cmd;
+	ts->x_plate_ohm = x_plate_ohm;
+	ts->esd_timeout = esd_timeout;
+
+	ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ts->reset_gpio)) {
+		error = PTR_ERR(ts->reset_gpio);
+		dev_err(dev, "error acquiring reset gpio: %d\n", error);
+		return error;
+	}
+
+	ts->vio = devm_regulator_get_optional(dev, "vio");
+	if (IS_ERR(ts->vio)) {
+		error = PTR_ERR(ts->vio);
+		dev_err(dev, "vio regulator missing (%d)", error);
+		return error;
+	}
+
+	if (!ts->reset_gpio && pdata)
+		ts->set_reset = pdata->set_reset;
+
+	mutex_init(&ts->mutex);
+
+	spin_lock_init(&ts->lock);
+	setup_timer(&ts->penup_timer, tsc200x_penup_timer, (unsigned long)ts);
+
+	INIT_DELAYED_WORK(&ts->esd_work, tsc200x_esd_work);
+
+	snprintf(ts->phys, sizeof(ts->phys),
+		 "%s/input-ts", dev_name(dev));
+
+	input_dev->name = "TSC200X touchscreen";
+	input_dev->phys = ts->phys;
+	input_dev->id.bustype = bustype;
+	input_dev->dev.parent = dev;
+	input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
+	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+	input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
+	input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
+	input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
+
+	if (np)
+		touchscreen_parse_properties(input_dev, false);
+
+	input_dev->open = tsc200x_open;
+	input_dev->close = tsc200x_close;
+
+	input_set_drvdata(input_dev, ts);
+
+	/* Ensure the touchscreen is off */
+	tsc200x_stop_scan(ts);
+
+	error = devm_request_threaded_irq(dev, irq, NULL,
+					  tsc200x_irq_thread,
+					  IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					  "tsc200x", ts);
+	if (error) {
+		dev_err(dev, "Failed to request irq, err: %d\n", error);
+		return error;
+	}
+
+	/* enable regulator for DT */
+	if (ts->vio) {
+		error = regulator_enable(ts->vio);
+		if (error)
+			return error;
+	}
+
+	dev_set_drvdata(dev, ts);
+	error = sysfs_create_group(&dev->kobj, &tsc200x_attr_group);
+	if (error) {
+		dev_err(dev,
+			"Failed to create sysfs attributes, err: %d\n", error);
+		goto disable_regulator;
+	}
+
+	error = input_register_device(ts->idev);
+	if (error) {
+		dev_err(dev,
+			"Failed to register input device, err: %d\n", error);
+		goto err_remove_sysfs;
+	}
+
+	irq_set_irq_wake(irq, 1);
+	return 0;
+
+err_remove_sysfs:
+	sysfs_remove_group(&dev->kobj, &tsc200x_attr_group);
+disable_regulator:
+	if (ts->vio)
+		regulator_disable(ts->vio);
+	return error;
+}
+EXPORT_SYMBOL_GPL(tsc200x_probe);
+
+int tsc200x_remove(struct device *dev)
+{
+	struct tsc200x *ts = dev_get_drvdata(dev);
+
+	sysfs_remove_group(&dev->kobj, &tsc200x_attr_group);
+
+	if (ts->vio)
+		regulator_disable(ts->vio);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tsc200x_remove);
+
+static int __maybe_unused tsc200x_suspend(struct device *dev)
+{
+	struct tsc200x *ts = dev_get_drvdata(dev);
+
+	mutex_lock(&ts->mutex);
+
+	if (!ts->suspended && ts->opened)
+		__tsc200x_disable(ts);
+
+	ts->suspended = true;
+
+	mutex_unlock(&ts->mutex);
+
+	return 0;
+}
+
+static int __maybe_unused tsc200x_resume(struct device *dev)
+{
+	struct tsc200x *ts = dev_get_drvdata(dev);
+
+	mutex_lock(&ts->mutex);
+
+	if (ts->suspended && ts->opened)
+		__tsc200x_enable(ts);
+
+	ts->suspended = false;
+
+	mutex_unlock(&ts->mutex);
+
+	return 0;
+}
+
+SIMPLE_DEV_PM_OPS(tsc200x_pm_ops, tsc200x_suspend, tsc200x_resume);
+EXPORT_SYMBOL_GPL(tsc200x_pm_ops);
+
+MODULE_AUTHOR("Lauri Leukkunen <[e-mail]>");
+MODULE_DESCRIPTION("TSC200x Touchscreen Driver Core");
+MODULE_LICENSE("GPL");

drivers/input/touchscreen/tsc200x-core.h

···
+#ifndef _TSC200X_CORE_H
+#define _TSC200X_CORE_H
+
+/* control byte 1 */
+#define TSC200X_CMD			0x80
+#define TSC200X_CMD_NORMAL		0x00
+#define TSC200X_CMD_STOP		0x01
+#define TSC200X_CMD_12BIT		0x04
+
+/* control byte 0 */
+#define TSC200X_REG_READ		0x01 /* R/W access */
+#define TSC200X_REG_PND0		0x02 /* Power Not Down Control */
+#define TSC200X_REG_X			(0x0 << 3)
+#define TSC200X_REG_Y			(0x1 << 3)
+#define TSC200X_REG_Z1			(0x2 << 3)
+#define TSC200X_REG_Z2			(0x3 << 3)
+#define TSC200X_REG_AUX			(0x4 << 3)
+#define TSC200X_REG_TEMP1		(0x5 << 3)
+#define TSC200X_REG_TEMP2		(0x6 << 3)
+#define TSC200X_REG_STATUS		(0x7 << 3)
+#define TSC200X_REG_AUX_HIGH		(0x8 << 3)
+#define TSC200X_REG_AUX_LOW		(0x9 << 3)
+#define TSC200X_REG_TEMP_HIGH		(0xA << 3)
+#define TSC200X_REG_TEMP_LOW		(0xB << 3)
+#define TSC200X_REG_CFR0		(0xC << 3)
+#define TSC200X_REG_CFR1		(0xD << 3)
+#define TSC200X_REG_CFR2		(0xE << 3)
+#define TSC200X_REG_CONV_FUNC		(0xF << 3)
+
+/* configuration register 0 */
+#define TSC200X_CFR0_PRECHARGE_276US	0x0040
+#define TSC200X_CFR0_STABTIME_1MS	0x0300
+#define TSC200X_CFR0_CLOCK_1MHZ		0x1000
+#define TSC200X_CFR0_RESOLUTION12	0x2000
+#define TSC200X_CFR0_PENMODE		0x8000
+#define TSC200X_CFR0_INITVALUE		(TSC200X_CFR0_STABTIME_1MS    | \
+					 TSC200X_CFR0_CLOCK_1MHZ      | \
+					 TSC200X_CFR0_RESOLUTION12    | \
+					 TSC200X_CFR0_PRECHARGE_276US | \
+					 TSC200X_CFR0_PENMODE)
+
+/* bits common to both read and write of configuration register 0 */
+#define	TSC200X_CFR0_RW_MASK		0x3fff
+
+/* configuration register 1 */
+#define TSC200X_CFR1_BATCHDELAY_4MS	0x0003
+#define TSC200X_CFR1_INITVALUE		TSC200X_CFR1_BATCHDELAY_4MS
+
+/* configuration register 2 */
+#define TSC200X_CFR2_MAVE_Z		0x0004
+#define TSC200X_CFR2_MAVE_Y		0x0008
+#define TSC200X_CFR2_MAVE_X		0x0010
+#define TSC200X_CFR2_AVG_7		0x0800
+#define TSC200X_CFR2_MEDIUM_15		0x3000
+#define TSC200X_CFR2_INITVALUE		(TSC200X_CFR2_MAVE_X	| \
+					 TSC200X_CFR2_MAVE_Y	| \
+					 TSC200X_CFR2_MAVE_Z	| \
+					 TSC200X_CFR2_MEDIUM_15	| \
+					 TSC200X_CFR2_AVG_7)
+
+#define MAX_12BIT			0xfff
+#define TSC200X_DEF_X_FUZZ		4
+#define TSC200X_DEF_Y_FUZZ		8
+#define TSC200X_DEF_P_FUZZ		2
+#define TSC200X_DEF_RESISTOR		280
+
+#define TSC2005_SPI_MAX_SPEED_HZ	10000000
+#define TSC200X_PENUP_TIME_MS		40
+
+extern const struct regmap_config tsc200x_regmap_config;
+extern const struct dev_pm_ops tsc200x_pm_ops;
+
+int tsc200x_probe(struct device *dev, int irq, __u16 bustype,
+		  struct regmap *regmap,
+		  int (*tsc200x_cmd)(struct device *dev, u8 cmd));
+int tsc200x_remove(struct device *dev);
+
+#endif