drivers/input/touchscreen/tsc2005.c - kernel/msm-4.9 - Gitiles

 /*
  * TSC2005 touchscreen driver
  *
  * Copyright (C) 2006-2010 Nokia Corporation
  *
  * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
  * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
  *
  * 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.
  *
  * 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/of_gpio.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/tsc2005.h>
 #include <linux/regulator/consumer.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		0x0001
 #define TSC2005_REG_PND0		0x0002
 #define TSC2005_REG_X			0x0000
 #define TSC2005_REG_Y			0x0008
 #define TSC2005_REG_Z1			0x0010
 #define TSC2005_REG_Z2			0x0018
 #define TSC2005_REG_TEMP_HIGH		0x0050
 #define TSC2005_REG_CFR0		0x0060
 #define TSC2005_REG_CFR1		0x0068
 #define TSC2005_REG_CFR2		0x0070

 /* 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

 struct tsc2005_spi_rd {
 	struct spi_transfer	spi_xfer;
 	u32			spi_tx;
 	u32			spi_rx;
 };

 struct tsc2005 {
 	struct spi_device	*spi;

 	struct spi_message      spi_read_msg;
 	struct tsc2005_spi_rd	spi_x;
 	struct tsc2005_spi_rd	spi_y;
 	struct tsc2005_spi_rd	spi_z1;
 	struct tsc2005_spi_rd	spi_z2;

 	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;

 	int			reset_gpio;
 	void			(*set_reset)(bool enable);
 };

 static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
 {
 	u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
 	struct spi_transfer xfer = {
 		.tx_buf		= &tx,
 		.len		= 1,
 		.bits_per_word	= 8,
 	};
 	struct spi_message msg;
 	int error;

 	spi_message_init(&msg);
 	spi_message_add_tail(&xfer, &msg);

 	error = spi_sync(ts->spi, &msg);
 	if (error) {
 		dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n",
 			__func__, cmd, error);
 		return error;
 	}

 	return 0;
 }

 static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
 {
 	u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value;
 	struct spi_transfer xfer = {
 		.tx_buf		= &tx,
 		.len		= 4,
 		.bits_per_word	= 24,
 	};
 	struct spi_message msg;
 	int error;

 	spi_message_init(&msg);
 	spi_message_add_tail(&xfer, &msg);

 	error = spi_sync(ts->spi, &msg);
 	if (error) {
 		dev_err(&ts->spi->dev,
 			"%s: failed, register: %x, value: %x, error: %d\n",
 			__func__, reg, value, error);
 		return error;
 	}

 	return 0;
 }

 static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
 {
 	memset(rd, 0, sizeof(*rd));

 	rd->spi_tx		   = (reg | TSC2005_REG_READ) << 16;
 	rd->spi_xfer.tx_buf	   = &rd->spi_tx;
 	rd->spi_xfer.rx_buf	   = &rd->spi_rx;
 	rd->spi_xfer.len	   = 4;
 	rd->spi_xfer.bits_per_word = 24;
 	rd->spi_xfer.cs_change	   = !last;
 }

 static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
 {
 	struct tsc2005_spi_rd spi_rd;
 	struct spi_message msg;
 	int error;

 	tsc2005_setup_read(&spi_rd, reg, true);

 	spi_message_init(&msg);
 	spi_message_add_tail(&spi_rd.spi_xfer, &msg);

 	error = spi_sync(ts->spi, &msg);
 	if (error)
 		return error;

 	*value = spi_rd.spi_rx;
 	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;
 	u32 x, y;
 	u32 z1, z2;
 	int error;

 	/* read the coordinates */
 	error = spi_sync(ts->spi, &ts->spi_read_msg);
 	if (unlikely(error))
 		goto out;

 	x = ts->spi_x.spi_rx;
 	y = ts->spi_y.spi_rx;
 	z1 = ts->spi_z1.spi_rx;
 	z2 = ts->spi_z2.spi_rx;

 	/* validate position */
 	if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
 		goto out;

 	/* Skip reading if the pressure components are out of range */
 	if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= 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 == x && ts->in_y == y &&
 	    ts->in_z1 == z1 && ts->in_z2 == 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 = x;
 	ts->in_y = y;
 	ts->in_z1 = z1;
 	ts->in_z2 = z2;

 	/* Compute touch pressure resistance using equation #1 */
 	pressure = x * (z2 - z1) / 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, x, 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)
 {
 	tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
 	tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
 	tsc2005_write(ts, 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 >= 0)
 		gpio_set_value(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 spi_device *spi = to_spi_device(dev);
 	struct tsc2005 *ts = spi_get_drvdata(spi);
 	u16 temp_high;
 	u16 temp_high_orig;
 	u16 temp_high_test;
 	bool success = true;
 	int error;

 	mutex_lock(&ts->mutex);

 	/*
 	 * Test TSC2005 communications via temp high register.
 	 */
 	__tsc2005_disable(ts);

 	error = tsc2005_read(ts, 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 = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
 	if (error) {
 		dev_warn(dev, "selftest failed: write error %d\n", error);
 		success = false;
 		goto out;
 	}

 	error = tsc2005_read(ts, 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 = tsc2005_read(ts, 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 spi_device *spi = to_spi_device(dev);
 	struct tsc2005 *ts = spi_get_drvdata(spi);
 	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;
 	u16 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 = tsc2005_read(ts, 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 void tsc2005_setup_spi_xfer(struct tsc2005 *ts)
 {
 	tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
 	tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
 	tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
 	tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);

 	spi_message_init(&ts->spi_read_msg);
 	spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
 	spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
 	spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
 	spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
 }

 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 (!spi->max_speed_hz)
 		spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;

 	error = spi_setup(spi);
 	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->x_plate_ohm = x_plate_ohm;
 	ts->esd_timeout = esd_timeout;

 	if (np) {
 		ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
 		if (ts->reset_gpio == -EPROBE_DEFER)
 			return ts->reset_gpio;
 		if (ts->reset_gpio < 0) {
 			dev_err(&spi->dev, "error acquiring reset gpio: %d\n",
 				ts->reset_gpio);
 			return ts->reset_gpio;
 		}

 		error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0,
 					      "reset-gpios");
 		if (error) {
 			dev_err(&spi->dev, "error requesting reset gpio: %d\n",
 				error);
 			return error;
 		}

 		ts->vio = devm_regulator_get(&spi->dev, "vio");
 		if (IS_ERR(ts->vio)) {
 			error = PTR_ERR(ts->vio);
 			dev_err(&spi->dev, "vio regulator missing (%d)", error);
 			return error;
 		}
 	} else {
 		ts->reset_gpio = -1;
 		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);

 	tsc2005_setup_spi_xfer(ts);

 	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_of_params(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;
 	}

 	spi_set_drvdata(spi, 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;
 }

 static int tsc2005_remove(struct spi_device *spi)
 {
 	struct tsc2005 *ts = spi_get_drvdata(spi);

 	sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);

 	if (ts->vio)
 		regulator_disable(ts->vio);

 	return 0;
 }

 static int __maybe_unused tsc2005_suspend(struct device *dev)
 {
 	struct spi_device *spi = to_spi_device(dev);
 	struct tsc2005 *ts = spi_get_drvdata(spi);

 	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 spi_device *spi = to_spi_device(dev);
 	struct tsc2005 *ts = spi_get_drvdata(spi);

 	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,
 	},
 	.probe	= tsc2005_probe,
 	.remove	= tsc2005_remove,
 };

 module_spi_driver(tsc2005_driver);

 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("spi:tsc2005");
	/*
	* TSC2005 touchscreen driver
	*
	* Copyright (C) 2006-2010 Nokia Corporation
	*
	* Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
	* based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
	*
	* 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.
	*
	* 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/of_gpio.h>
	#include <linux/spi/spi.h>
	#include <linux/spi/tsc2005.h>
	#include <linux/regulator/consumer.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 0x0001
	#define TSC2005_REG_PND0 0x0002
	#define TSC2005_REG_X 0x0000
	#define TSC2005_REG_Y 0x0008
	#define TSC2005_REG_Z1 0x0010
	#define TSC2005_REG_Z2 0x0018
	#define TSC2005_REG_TEMP_HIGH 0x0050
	#define TSC2005_REG_CFR0 0x0060
	#define TSC2005_REG_CFR1 0x0068
	#define TSC2005_REG_CFR2 0x0070

	/* 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

	struct tsc2005_spi_rd {
	struct spi_transfer spi_xfer;
	u32 spi_tx;
	u32 spi_rx;
	};

	struct tsc2005 {
	struct spi_device *spi;

	struct spi_message spi_read_msg;
	struct tsc2005_spi_rd spi_x;
	struct tsc2005_spi_rd spi_y;
	struct tsc2005_spi_rd spi_z1;
	struct tsc2005_spi_rd spi_z2;

	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;

	int reset_gpio;
	void (*set_reset)(bool enable);
	};

	static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
	{
	u8 tx = TSC2005_CMD \| TSC2005_CMD_12BIT \| cmd;
	struct spi_transfer xfer = {
	.tx_buf = &tx,
	.len = 1,
	.bits_per_word = 8,
	};
	struct spi_message msg;
	int error;

	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	error = spi_sync(ts->spi, &msg);
	if (error) {
	dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n",
	__func__, cmd, error);
	return error;
	}

	return 0;
	}

	static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
	{
	u32 tx = ((reg \| TSC2005_REG_PND0) << 16) \| value;
	struct spi_transfer xfer = {
	.tx_buf = &tx,
	.len = 4,
	.bits_per_word = 24,
	};
	struct spi_message msg;
	int error;

	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	error = spi_sync(ts->spi, &msg);
	if (error) {
	dev_err(&ts->spi->dev,
	"%s: failed, register: %x, value: %x, error: %d\n",
	__func__, reg, value, error);
	return error;
	}

	return 0;
	}

	static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
	{
	memset(rd, 0, sizeof(*rd));

	rd->spi_tx = (reg \| TSC2005_REG_READ) << 16;
	rd->spi_xfer.tx_buf = &rd->spi_tx;
	rd->spi_xfer.rx_buf = &rd->spi_rx;
	rd->spi_xfer.len = 4;
	rd->spi_xfer.bits_per_word = 24;
	rd->spi_xfer.cs_change = !last;
	}

	static int tsc2005_read(struct tsc2005 ts, u8 reg, u16 value)
	{
	struct tsc2005_spi_rd spi_rd;
	struct spi_message msg;
	int error;

	tsc2005_setup_read(&spi_rd, reg, true);

	spi_message_init(&msg);
	spi_message_add_tail(&spi_rd.spi_xfer, &msg);

	error = spi_sync(ts->spi, &msg);
	if (error)
	return error;

	*value = spi_rd.spi_rx;
	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;
	u32 x, y;
	u32 z1, z2;
	int error;

	/* read the coordinates */
	error = spi_sync(ts->spi, &ts->spi_read_msg);
	if (unlikely(error))
	goto out;

	x = ts->spi_x.spi_rx;
	y = ts->spi_y.spi_rx;
	z1 = ts->spi_z1.spi_rx;
	z2 = ts->spi_z2.spi_rx;

	/* validate position */
	if (unlikely(x > MAX_12BIT \|\| y > MAX_12BIT))
	goto out;

	/* Skip reading if the pressure components are out of range */
	if (unlikely(z1 == 0 \|\| z2 > MAX_12BIT \|\| z1 >= 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 == x && ts->in_y == y &&
	ts->in_z1 == z1 && ts->in_z2 == 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 = x;
	ts->in_y = y;
	ts->in_z1 = z1;
	ts->in_z2 = z2;

	/* Compute touch pressure resistance using equation #1 */
	pressure = x * (z2 - z1) / 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, x, 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)
	{
	tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
	tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
	tsc2005_write(ts, 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 >= 0)
	gpio_set_value(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 spi_device *spi = to_spi_device(dev);
	struct tsc2005 *ts = spi_get_drvdata(spi);
	u16 temp_high;
	u16 temp_high_orig;
	u16 temp_high_test;
	bool success = true;
	int error;

	mutex_lock(&ts->mutex);

	/*
	* Test TSC2005 communications via temp high register.
	*/
	__tsc2005_disable(ts);

	error = tsc2005_read(ts, 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 = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
	if (error) {
	dev_warn(dev, "selftest failed: write error %d\n", error);
	success = false;
	goto out;
	}

	error = tsc2005_read(ts, 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 = tsc2005_read(ts, 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 spi_device *spi = to_spi_device(dev);
	struct tsc2005 *ts = spi_get_drvdata(spi);
	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;
	u16 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 = tsc2005_read(ts, 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 void tsc2005_setup_spi_xfer(struct tsc2005 *ts)
	{
	tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
	tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
	tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
	tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);

	spi_message_init(&ts->spi_read_msg);
	spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
	spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
	spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
	spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
	}

	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 (!spi->max_speed_hz)
	spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;

	error = spi_setup(spi);
	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->x_plate_ohm = x_plate_ohm;
	ts->esd_timeout = esd_timeout;

	if (np) {
	ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
	if (ts->reset_gpio == -EPROBE_DEFER)
	return ts->reset_gpio;
	if (ts->reset_gpio < 0) {
	dev_err(&spi->dev, "error acquiring reset gpio: %d\n",
	ts->reset_gpio);
	return ts->reset_gpio;
	}

	error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0,
	"reset-gpios");
	if (error) {
	dev_err(&spi->dev, "error requesting reset gpio: %d\n",
	error);
	return error;
	}

	ts->vio = devm_regulator_get(&spi->dev, "vio");
	if (IS_ERR(ts->vio)) {
	error = PTR_ERR(ts->vio);
	dev_err(&spi->dev, "vio regulator missing (%d)", error);
	return error;
	}
	} else {
	ts->reset_gpio = -1;
	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);

	tsc2005_setup_spi_xfer(ts);

	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_of_params(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;
	}

	spi_set_drvdata(spi, 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;
	}

	static int tsc2005_remove(struct spi_device *spi)
	{
	struct tsc2005 *ts = spi_get_drvdata(spi);

	sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);

	if (ts->vio)
	regulator_disable(ts->vio);

	return 0;
	}

	static int __maybe_unused tsc2005_suspend(struct device *dev)
	{
	struct spi_device *spi = to_spi_device(dev);
	struct tsc2005 *ts = spi_get_drvdata(spi);

	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 spi_device *spi = to_spi_device(dev);
	struct tsc2005 *ts = spi_get_drvdata(spi);

	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,
	},
	.probe = tsc2005_probe,
	.remove = tsc2005_remove,
	};

	module_spi_driver(tsc2005_driver);

	MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
	MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("spi:tsc2005");