Input: introduce tsc2005 driver (37bd4469) · Commits · 戴 / test

drivers/input/touchscreen/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -629,6 +629,17 @@ config TOUCHSCREEN_TOUCHIT213
		To compile this driver as a module, choose M here: the
		module will be called touchit213.

		config TOUCHSCREEN_TSC2005
		tristate "TSC2005 based touchscreens"
		depends on SPI_MASTER
		help
		Say Y here if you have a TSC2005 based touchscreen.

		If unsure, say N.

		To compile this driver as a module, choose M here: the
		module will be called tsc2005.

		config TOUCHSCREEN_TSC2007
		tristate "TSC2007 based touchscreens"
		depends on I2C

drivers/input/touchscreen/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -44,6 +44,7 @@ obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += tnetv107x-ts.o
		obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
		obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
		obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
		obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o
		obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
		obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
		obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o

drivers/input/touchscreen/tsc2005.c

0 → 100644

+713 −0

Original line number	Diff line number	Diff line
		/*
		* 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/interrupt.h>
		#include <linux/delay.h>
		#include <linux/spi/spi.h>
		#include <linux/spi/tsc2005.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_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;

		struct timer_list penup_timer;
		struct work_struct penup_work;

		unsigned int esd_timeout;
		struct timer_list esd_timer;
		struct work_struct esd_work;

		unsigned int x_plate_ohm;

		bool disabled;
		unsigned int disable_depth;
		unsigned int pen_down;

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

		static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
		{
		u8 tx;
		struct spi_message msg;
		struct spi_transfer xfer = { 0 };

		tx = TSC2005_CMD \| TSC2005_CMD_12BIT \| cmd;

		xfer.tx_buf = &tx;
		xfer.rx_buf = NULL;
		xfer.len = 1;
		xfer.bits_per_word = 8;

		spi_message_init(&msg);
		spi_message_add_tail(&xfer, &msg);
		spi_sync(ts->spi, &msg);
		}

		static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
		{
		u32 tx;
		struct spi_message msg;
		struct spi_transfer xfer = { 0 };

		tx = (reg \| TSC2005_REG_PND0) << 16;
		tx \|= value;

		xfer.tx_buf = &tx;
		xfer.rx_buf = NULL;
		xfer.len = 4;
		xfer.bits_per_word = 24;

		spi_message_init(&msg);
		spi_message_add_tail(&xfer, &msg);
		spi_sync(ts->spi, &msg);
		}

		static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
		{
		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 void tsc2005_read(struct tsc2005 ts, u8 reg, u16 value)
		{
		struct spi_message msg;
		struct tsc2005_spi_rd spi_rd = { { 0 }, 0, 0 };

		tsc2005_setup_read(&spi_rd, reg, 1);

		spi_message_init(&msg);
		spi_message_add_tail(&spi_rd.spi_xfer, &msg);
		spi_sync(ts->spi, &msg);
		*value = spi_rd.spi_rx;
		}

		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 = 1;
		}
		} else {
		input_report_abs(ts->idev, ABS_PRESSURE, 0);
		if (ts->pen_down) {
		input_report_key(ts->idev, BTN_TOUCH, 0);
		ts->pen_down = 0;
		}
		}
		input_sync(ts->idev);
		dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
		pressure);
		}

		static irqreturn_t tsc2005_irq_handler(int irq, void *dev_id)
		{
		struct tsc2005 *ts = dev_id;

		/* update the penup timer only if it's pending */
		mod_timer_pending(&ts->penup_timer,
		jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));

		return IRQ_WAKE_THREAD;
		}

		static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
		{
		struct tsc2005 *ts = _ts;
		unsigned int pressure;
		u32 x;
		u32 y;
		u32 z1;
		u32 z2;

		mutex_lock(&ts->mutex);

		if (unlikely(ts->disable_depth))
		goto out;

		/* read the coordinates */
		spi_sync(ts->spi, &ts->spi_read_msg);
		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 coords 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;

		tsc2005_update_pen_state(ts, x, y, pressure);

		/* set the penup timer */
		mod_timer(&ts->penup_timer,
		jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));

		if (!ts->esd_timeout)
		goto out;

		/* update the watchdog timer */
		mod_timer(&ts->esd_timer,
		round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));

		out:
		mutex_unlock(&ts->mutex);
		return IRQ_HANDLED;
		}

		static void tsc2005_penup_timer(unsigned long data)
		{
		struct tsc2005 ts = (struct tsc2005 )data;

		schedule_work(&ts->penup_work);
		}

		static void tsc2005_penup_work(struct work_struct *work)
		{
		struct tsc2005 *ts = container_of(work, struct tsc2005, penup_work);

		mutex_lock(&ts->mutex);
		tsc2005_update_pen_state(ts, 0, 0, 0);
		mutex_unlock(&ts->mutex);
		}

		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);
		}

		/* must be called with mutex held */
		static void tsc2005_disable(struct tsc2005 *ts)
		{
		if (ts->disable_depth++ != 0)
		return;
		disable_irq(ts->spi->irq);
		if (ts->esd_timeout)
		del_timer_sync(&ts->esd_timer);
		del_timer_sync(&ts->penup_timer);
		tsc2005_stop_scan(ts);
		}

		/* must be called with mutex held */
		static void tsc2005_enable(struct tsc2005 *ts)
		{
		if (--ts->disable_depth != 0)
		return;
		tsc2005_start_scan(ts);
		enable_irq(ts->spi->irq);
		if (!ts->esd_timeout)
		return;
		mod_timer(&ts->esd_timer,
		round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
		}

		static ssize_t tsc2005_disable_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct tsc2005 *ts = dev_get_drvdata(dev);

		return sprintf(buf, "%u\n", ts->disabled);
		}

		static ssize_t tsc2005_disable_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t count)
		{
		struct tsc2005 *ts = dev_get_drvdata(dev);
		unsigned long res;
		int i;

		if (strict_strtoul(buf, 10, &res) < 0)
		return -EINVAL;
		i = res ? 1 : 0;

		mutex_lock(&ts->mutex);
		if (i == ts->disabled)
		goto out;
		ts->disabled = i;
		if (i)
		tsc2005_disable(ts);
		else
		tsc2005_enable(ts);
		out:
		mutex_unlock(&ts->mutex);
		return count;
		}
		static DEVICE_ATTR(disable, 0664, tsc2005_disable_show, tsc2005_disable_store);

		static ssize_t tsc2005_selftest_show(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct tsc2005 *ts = dev_get_drvdata(dev);
		u16 temp_high;
		u16 temp_high_orig;
		u16 temp_high_test;
		unsigned int result;

		if (!ts->set_reset) {
		dev_warn(&ts->spi->dev,
		"unable to selftest: no reset function\n");
		result = 0;
		goto out;
		}

		mutex_lock(&ts->mutex);

		/*
		* Test TSC2005 communications via temp high register.
		*/
		tsc2005_disable(ts);
		result = 1;
		tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
		temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
		tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
		tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
		if (temp_high != temp_high_test) {
		dev_warn(dev, "selftest failed: %d != %d\n",
		temp_high, temp_high_test);
		result = 0;
		}

		/* hardware reset */
		ts->set_reset(0);
		usleep_range(100, 500); /* only 10us required */
		ts->set_reset(1);
		tsc2005_enable(ts);

		/* test that the reset really happened */
		tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
		if (temp_high != temp_high_orig) {
		dev_warn(dev, "selftest failed after reset: %d != %d\n",
		temp_high, temp_high_orig);
		result = 0;
		}

		mutex_unlock(&ts->mutex);

		out:
		return sprintf(buf, "%u\n", result);
		}
		static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);

		static void tsc2005_esd_timer(unsigned long data)
		{
		struct tsc2005 ts = (struct tsc2005 )data;

		schedule_work(&ts->esd_work);
		}

		static void tsc2005_esd_work(struct work_struct *work)
		{
		struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
		u16 r;

		mutex_lock(&ts->mutex);

		if (ts->disable_depth)
		goto out;

		/*
		* If we cannot read our known value from configuration register 0 then
		* reset the controller as if from power-up and start scanning again.
		*/
		tsc2005_read(ts, TSC2005_REG_CFR0, &r);
		if ((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
		dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
		ts->set_reset(0);
		tsc2005_update_pen_state(ts, 0, 0, 0);
		usleep_range(100, 500); /* only 10us required */
		ts->set_reset(1);
		tsc2005_start_scan(ts);
		}

		/* re-arm the watchdog */
		mod_timer(&ts->esd_timer,
		round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));

		out:
		mutex_unlock(&ts->mutex);
		}

		static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts)
		{
		tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, 0);
		tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, 0);
		tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, 0);
		tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, 1);

		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 struct attribute *tsc2005_attrs[] = {
		&dev_attr_disable.attr,
		&dev_attr_selftest.attr,
		NULL
		};

		static struct attribute_group tsc2005_attr_group = {
		.attrs = tsc2005_attrs,
		};

		static int __devinit tsc2005_setup(struct tsc2005 *ts,
		struct tsc2005_platform_data *pdata)
		{
		int r;
		int fudge_x;
		int fudge_y;
		int fudge_p;
		int p_max;
		int x_max;
		int y_max;

		mutex_init(&ts->mutex);

		tsc2005_setup_spi_xfer(ts);

		init_timer(&ts->penup_timer);
		setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
		INIT_WORK(&ts->penup_work, tsc2005_penup_work);

		fudge_x = pdata->ts_x_fudge ? : 4;
		fudge_y = pdata->ts_y_fudge ? : 8;
		fudge_p = pdata->ts_pressure_fudge ? : 2;
		x_max = pdata->ts_x_max ? : MAX_12BIT;
		y_max = pdata->ts_y_max ? : MAX_12BIT;
		p_max = pdata->ts_pressure_max ? : MAX_12BIT;
		ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
		ts->esd_timeout = pdata->esd_timeout_ms;
		ts->set_reset = pdata->set_reset;

		ts->idev = input_allocate_device();
		if (ts->idev == NULL)
		return -ENOMEM;
		ts->idev->name = "TSC2005 touchscreen";
		snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts",
		dev_name(&ts->spi->dev));
		ts->idev->phys = ts->phys;
		ts->idev->evbit[0] = BIT(EV_ABS) \| BIT(EV_KEY);
		ts->idev->absbit[0] = BIT(ABS_X) \| BIT(ABS_Y) \| BIT(ABS_PRESSURE);
		ts->idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

		input_set_abs_params(ts->idev, ABS_X, 0, x_max, fudge_x, 0);
		input_set_abs_params(ts->idev, ABS_Y, 0, y_max, fudge_y, 0);
		input_set_abs_params(ts->idev, ABS_PRESSURE, 0, p_max, fudge_p, 0);

		r = request_threaded_irq(ts->spi->irq, tsc2005_irq_handler,
		tsc2005_irq_thread, IRQF_TRIGGER_RISING,
		"tsc2005", ts);
		if (r) {
		dev_err(&ts->spi->dev, "request_threaded_irq(): %d\n", r);
		goto err1;
		}
		set_irq_wake(ts->spi->irq, 1);

		r = input_register_device(ts->idev);
		if (r) {
		dev_err(&ts->spi->dev, "input_register_device(): %d\n", r);
		goto err2;
		}

		r = sysfs_create_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
		if (r)
		dev_warn(&ts->spi->dev, "sysfs entry creation failed: %d\n", r);

		tsc2005_start_scan(ts);

		if (!ts->esd_timeout \|\| !ts->set_reset)
		goto done;

		/* start the optional ESD watchdog */
		setup_timer(&ts->esd_timer, tsc2005_esd_timer, (unsigned long)ts);
		INIT_WORK(&ts->esd_work, tsc2005_esd_work);
		mod_timer(&ts->esd_timer,
		round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));

		done:
		return 0;

		err2:
		free_irq(ts->spi->irq, ts);

		err1:
		input_free_device(ts->idev);
		return r;
		}

		static int __devinit tsc2005_probe(struct spi_device *spi)
		{
		struct tsc2005_platform_data *pdata = spi->dev.platform_data;
		struct tsc2005 *ts;
		int r;

		if (spi->irq < 0) {
		dev_dbg(&spi->dev, "no irq\n");
		return -ENODEV;
		}

		if (!pdata) {
		dev_dbg(&spi->dev, "no platform data\n");
		return -ENODEV;
		}

		ts = kzalloc(sizeof(*ts), GFP_KERNEL);
		if (ts == NULL)
		return -ENOMEM;

		dev_set_drvdata(&spi->dev, ts);
		ts->spi = spi;
		spi->dev.power.power_state = PMSG_ON;
		spi->mode = SPI_MODE_0;
		spi->bits_per_word = 8;
		if (!spi->max_speed_hz)
		spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
		spi_setup(spi);

		r = tsc2005_setup(ts, pdata);
		if (r)
		kfree(ts);
		return r;
		}

		static int __devexit tsc2005_remove(struct spi_device *spi)
		{
		struct tsc2005 *ts = dev_get_drvdata(&spi->dev);

		mutex_lock(&ts->mutex);
		tsc2005_disable(ts);
		mutex_unlock(&ts->mutex);

		if (ts->esd_timeout)
		del_timer_sync(&ts->esd_timer);
		del_timer_sync(&ts->penup_timer);

		flush_work(&ts->esd_work);
		flush_work(&ts->penup_work);

		sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
		free_irq(ts->spi->irq, ts);
		input_unregister_device(ts->idev);
		kfree(ts);

		return 0;
		}

		#ifdef CONFIG_PM
		static int tsc2005_suspend(struct spi_device *spi, pm_message_t mesg)
		{
		struct tsc2005 *ts = dev_get_drvdata(&spi->dev);

		mutex_lock(&ts->mutex);
		tsc2005_disable(ts);
		mutex_unlock(&ts->mutex);

		return 0;
		}

		static int tsc2005_resume(struct spi_device *spi)
		{
		struct tsc2005 *ts = dev_get_drvdata(&spi->dev);

		mutex_lock(&ts->mutex);
		tsc2005_enable(ts);
		mutex_unlock(&ts->mutex);

		return 0;
		}
		#endif

		static struct spi_driver tsc2005_driver = {
		.driver = {
		.name = "tsc2005",
		.owner = THIS_MODULE,
		},
		#ifdef CONFIG_PM
		.suspend = tsc2005_suspend,
		.resume = tsc2005_resume,
		#endif
		.probe = tsc2005_probe,
		.remove = __devexit_p(tsc2005_remove),
		};

		static int __init tsc2005_init(void)
		{
		printk(KERN_INFO "TSC2005 driver initializing\n");
		return spi_register_driver(&tsc2005_driver);
		}
		module_init(tsc2005_init);

		static void __exit tsc2005_exit(void)
		{
		spi_unregister_driver(&tsc2005_driver);
		}
		module_exit(tsc2005_exit);

		MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:tsc2005");

include/linux/spi/tsc2005.h

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Original line number	Diff line number	Diff line
		/*
		* This file is part of TSC2005 touchscreen driver
		*
		* Copyright (C) 2009-2010 Nokia Corporation
		*
		* Contact: Aaro Koskinen <aaro.koskinen@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
		*
		*/

		#ifndef _LINUX_SPI_TSC2005_H
		#define _LINUX_SPI_TSC2005_H

		#include <linux/types.h>

		struct tsc2005_platform_data {
		int ts_pressure_max;
		int ts_pressure_fudge;
		int ts_x_max;
		int ts_x_fudge;
		int ts_y_max;
		int ts_y_fudge;
		int ts_x_plate_ohm;
		unsigned int esd_timeout_ms;
		void (*set_reset)(bool enable);
		};

		#endif

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