Input: add ROHM BU21013 touch panel controller support (4780c8df) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/input/touchscreen/Kconfig

+12 −0

Original line number	Diff line number	Diff line
		@@ -98,6 +98,18 @@ config TOUCHSCREEN_BITSY
		To compile this driver as a module, choose M here: the
		module will be called h3600_ts_input.

		config TOUCHSCREEN_BU21013
		tristate "BU21013 based touch panel controllers"
		depends on I2C
		help
		Say Y here if you have a bu21013 touchscreen connected to
		your system.

		If unsure, say N.

		To compile this driver as a module, choose M here: the
		module will be called bu21013_ts.

		config TOUCHSCREEN_CY8CTMG110
		tristate "cy8ctmg110 touchscreen"
		depends on I2C

drivers/input/touchscreen/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@ obj-$(CONFIG_TOUCHSCREEN_AD7879_SPI) += ad7879-spi.o
		obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o
		obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o
		obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o
		obj-$(CONFIG_TOUCHSCREEN_BU21013) += bu21013_ts.o
		obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110) += cy8ctmg110_ts.o
		obj-$(CONFIG_TOUCHSCREEN_DA9034) += da9034-ts.o
		obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o

drivers/input/touchscreen/bu21013_ts.c

0 → 100644

+648 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) ST-Ericsson SA 2010
		* Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
		* License terms:GNU General Public License (GPL) version 2
		*/

		#include <linux/kernel.h>
		#include <linux/delay.h>
		#include <linux/interrupt.h>
		#include <linux/i2c.h>
		#include <linux/workqueue.h>
		#include <linux/input.h>
		#include <linux/input/bu21013.h>
		#include <linux/slab.h>

		#define PEN_DOWN_INTR 0
		#define MAX_FINGERS 2
		#define RESET_DELAY 30
		#define PENUP_TIMEOUT (10)
		#define DELTA_MIN 16
		#define MASK_BITS 0x03
		#define SHIFT_8 8
		#define SHIFT_2 2
		#define LENGTH_OF_BUFFER 11
		#define I2C_RETRY_COUNT 5

		#define BU21013_SENSORS_BTN_0_7_REG 0x70
		#define BU21013_SENSORS_BTN_8_15_REG 0x71
		#define BU21013_SENSORS_BTN_16_23_REG 0x72
		#define BU21013_X1_POS_MSB_REG 0x73
		#define BU21013_X1_POS_LSB_REG 0x74
		#define BU21013_Y1_POS_MSB_REG 0x75
		#define BU21013_Y1_POS_LSB_REG 0x76
		#define BU21013_X2_POS_MSB_REG 0x77
		#define BU21013_X2_POS_LSB_REG 0x78
		#define BU21013_Y2_POS_MSB_REG 0x79
		#define BU21013_Y2_POS_LSB_REG 0x7A
		#define BU21013_INT_CLR_REG 0xE8
		#define BU21013_INT_MODE_REG 0xE9
		#define BU21013_GAIN_REG 0xEA
		#define BU21013_OFFSET_MODE_REG 0xEB
		#define BU21013_XY_EDGE_REG 0xEC
		#define BU21013_RESET_REG 0xED
		#define BU21013_CALIB_REG 0xEE
		#define BU21013_DONE_REG 0xEF
		#define BU21013_SENSOR_0_7_REG 0xF0
		#define BU21013_SENSOR_8_15_REG 0xF1
		#define BU21013_SENSOR_16_23_REG 0xF2
		#define BU21013_POS_MODE1_REG 0xF3
		#define BU21013_POS_MODE2_REG 0xF4
		#define BU21013_CLK_MODE_REG 0xF5
		#define BU21013_IDLE_REG 0xFA
		#define BU21013_FILTER_REG 0xFB
		#define BU21013_TH_ON_REG 0xFC
		#define BU21013_TH_OFF_REG 0xFD


		#define BU21013_RESET_ENABLE 0x01

		#define BU21013_SENSORS_EN_0_7 0x3F
		#define BU21013_SENSORS_EN_8_15 0xFC
		#define BU21013_SENSORS_EN_16_23 0x1F

		#define BU21013_POS_MODE1_0 0x02
		#define BU21013_POS_MODE1_1 0x04
		#define BU21013_POS_MODE1_2 0x08

		#define BU21013_POS_MODE2_ZERO 0x01
		#define BU21013_POS_MODE2_AVG1 0x02
		#define BU21013_POS_MODE2_AVG2 0x04
		#define BU21013_POS_MODE2_EN_XY 0x08
		#define BU21013_POS_MODE2_EN_RAW 0x10
		#define BU21013_POS_MODE2_MULTI 0x80

		#define BU21013_CLK_MODE_DIV 0x01
		#define BU21013_CLK_MODE_EXT 0x02
		#define BU21013_CLK_MODE_CALIB 0x80

		#define BU21013_IDLET_0 0x01
		#define BU21013_IDLET_1 0x02
		#define BU21013_IDLET_2 0x04
		#define BU21013_IDLET_3 0x08
		#define BU21013_IDLE_INTERMIT_EN 0x10

		#define BU21013_DELTA_0_6 0x7F
		#define BU21013_FILTER_EN 0x80

		#define BU21013_INT_MODE_LEVEL 0x00
		#define BU21013_INT_MODE_EDGE 0x01

		#define BU21013_GAIN_0 0x01
		#define BU21013_GAIN_1 0x02
		#define BU21013_GAIN_2 0x04

		#define BU21013_OFFSET_MODE_DEFAULT 0x00
		#define BU21013_OFFSET_MODE_MOVE 0x01
		#define BU21013_OFFSET_MODE_DISABLE 0x02

		#define BU21013_TH_ON_0 0x01
		#define BU21013_TH_ON_1 0x02
		#define BU21013_TH_ON_2 0x04
		#define BU21013_TH_ON_3 0x08
		#define BU21013_TH_ON_4 0x10
		#define BU21013_TH_ON_5 0x20
		#define BU21013_TH_ON_6 0x40
		#define BU21013_TH_ON_7 0x80
		#define BU21013_TH_ON_MAX 0xFF

		#define BU21013_TH_OFF_0 0x01
		#define BU21013_TH_OFF_1 0x02
		#define BU21013_TH_OFF_2 0x04
		#define BU21013_TH_OFF_3 0x08
		#define BU21013_TH_OFF_4 0x10
		#define BU21013_TH_OFF_5 0x20
		#define BU21013_TH_OFF_6 0x40
		#define BU21013_TH_OFF_7 0x80
		#define BU21013_TH_OFF_MAX 0xFF

		#define BU21013_X_EDGE_0 0x01
		#define BU21013_X_EDGE_1 0x02
		#define BU21013_X_EDGE_2 0x04
		#define BU21013_X_EDGE_3 0x08
		#define BU21013_Y_EDGE_0 0x10
		#define BU21013_Y_EDGE_1 0x20
		#define BU21013_Y_EDGE_2 0x40
		#define BU21013_Y_EDGE_3 0x80

		#define BU21013_DONE 0x01
		#define BU21013_NUMBER_OF_X_SENSORS (6)
		#define BU21013_NUMBER_OF_Y_SENSORS (11)

		#define DRIVER_TP "bu21013_tp"

		/**
		* struct bu21013_ts_data - touch panel data structure
		* @client: pointer to the i2c client
		* @wait: variable to wait_queue_head_t structure
		* @touch_stopped: touch stop flag
		* @chip: pointer to the touch panel controller
		* @in_dev: pointer to the input device structure
		* @intr_pin: interrupt pin value
		*
		* Touch panel device data structure
		*/
		struct bu21013_ts_data {
		struct i2c_client *client;
		wait_queue_head_t wait;
		bool touch_stopped;
		const struct bu21013_platform_device *chip;
		struct input_dev *in_dev;
		unsigned int intr_pin;
		};

		/**
		* bu21013_read_block_data(): read the touch co-ordinates
		* @data: bu21013_ts_data structure pointer
		* @buf: byte pointer
		*
		* Read the touch co-ordinates using i2c read block into buffer
		* and returns integer.
		*/
		static int bu21013_read_block_data(struct bu21013_ts_data data, u8 buf)
		{
		int ret, i;

		for (i = 0; i < I2C_RETRY_COUNT; i++) {
		ret = i2c_smbus_read_i2c_block_data
		(data->client, BU21013_SENSORS_BTN_0_7_REG,
		LENGTH_OF_BUFFER, buf);
		if (ret == LENGTH_OF_BUFFER)
		return 0;
		}
		return -EINVAL;
		}

		/**
		* bu21013_do_touch_report(): Get the touch co-ordinates
		* @data: bu21013_ts_data structure pointer
		*
		* Get the touch co-ordinates from touch sensor registers and writes
		* into device structure and returns integer.
		*/
		static int bu21013_do_touch_report(struct bu21013_ts_data *data)
		{
		u8 buf[LENGTH_OF_BUFFER];
		unsigned int pos_x[2], pos_y[2];
		bool has_x_sensors, has_y_sensors;
		int finger_down_count = 0;
		int i;

		if (data == NULL)
		return -EINVAL;

		if (bu21013_read_block_data(data, buf) < 0)
		return -EINVAL;

		has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
		has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) \|
		((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
		if (!has_x_sensors \|\| !has_y_sensors)
		return 0;

		for (i = 0; i < MAX_FINGERS; i++) {
		const u8 p = &buf[4 i + 3];
		unsigned int x = p[0] << SHIFT_2 \| (p[1] & MASK_BITS);
		unsigned int y = p[2] << SHIFT_2 \| (p[3] & MASK_BITS);
		if (x == 0 \|\| y == 0)
		continue;
		pos_x[finger_down_count] = x;
		pos_y[finger_down_count] = y;
		finger_down_count++;
		}

		if (finger_down_count) {
		if (finger_down_count == 2 &&
		(abs(pos_x[0] - pos_x[1]) < DELTA_MIN \|\|
		abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) {
		return 0;
		}

		for (i = 0; i < finger_down_count; i++) {
		if (data->chip->x_flip)
		pos_x[i] = data->chip->touch_x_max - pos_x[i];
		if (data->chip->y_flip)
		pos_y[i] = data->chip->touch_y_max - pos_y[i];

		input_report_abs(data->in_dev,
		ABS_MT_POSITION_X, pos_x[i]);
		input_report_abs(data->in_dev,
		ABS_MT_POSITION_Y, pos_y[i]);
		input_mt_sync(data->in_dev);
		}
		} else
		input_mt_sync(data->in_dev);

		input_sync(data->in_dev);

		return 0;
		}
		/**
		* bu21013_gpio_irq() - gpio thread function for touch interrupt
		* @irq: irq value
		* @device_data: void pointer
		*
		* This gpio thread function for touch interrupt
		* and returns irqreturn_t.
		*/
		static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
		{
		struct bu21013_ts_data *data = device_data;
		struct i2c_client *i2c = data->client;
		int retval;

		do {
		retval = bu21013_do_touch_report(data);
		if (retval < 0) {
		dev_err(&i2c->dev, "bu21013_do_touch_report failed\n");
		return IRQ_NONE;
		}

		data->intr_pin = data->chip->irq_read_val();
		if (data->intr_pin == PEN_DOWN_INTR)
		wait_event_timeout(data->wait, data->touch_stopped,
		msecs_to_jiffies(2));
		} while (!data->intr_pin && !data->touch_stopped);

		return IRQ_HANDLED;
		}

		/**
		* bu21013_init_chip() - power on sequence for the bu21013 controller
		* @data: device structure pointer
		*
		* This function is used to power on
		* the bu21013 controller and returns integer.
		*/
		static int bu21013_init_chip(struct bu21013_ts_data *data)
		{
		int retval;
		struct i2c_client *i2c = data->client;

		retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG,
		BU21013_RESET_ENABLE);
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_RESET reg write failed\n");
		return retval;
		}
		msleep(RESET_DELAY);

		retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG,
		BU21013_SENSORS_EN_0_7);
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG,
		BU21013_SENSORS_EN_8_15);
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG,
		BU21013_SENSORS_EN_16_23);
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG,
		(BU21013_POS_MODE1_0 \| BU21013_POS_MODE1_1));
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE2_REG,
		(BU21013_POS_MODE2_ZERO \| BU21013_POS_MODE2_AVG1 \|
		BU21013_POS_MODE2_AVG2 \| BU21013_POS_MODE2_EN_RAW \|
		BU21013_POS_MODE2_MULTI));
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n");
		return retval;
		}

		if (data->chip->ext_clk)
		retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
		(BU21013_CLK_MODE_EXT \| BU21013_CLK_MODE_CALIB));
		else
		retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
		(BU21013_CLK_MODE_DIV \| BU21013_CLK_MODE_CALIB));
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG,
		(BU21013_IDLET_0 \| BU21013_IDLE_INTERMIT_EN));
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG,
		BU21013_INT_MODE_LEVEL);
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG,
		(BU21013_DELTA_0_6 \|
		BU21013_FILTER_EN));
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG,
		BU21013_TH_ON_5);
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG,
		BU21013_TH_OFF_4 \|\| BU21013_TH_OFF_3);
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG,
		(BU21013_GAIN_0 \| BU21013_GAIN_1));
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG,
		BU21013_OFFSET_MODE_DEFAULT);
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG,
		(BU21013_X_EDGE_0 \| BU21013_X_EDGE_2 \|
		BU21013_Y_EDGE_1 \| BU21013_Y_EDGE_3));
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n");
		return retval;
		}

		retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG,
		BU21013_DONE);
		if (retval < 0) {
		dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n");
		return retval;
		}

		return 0;
		}

		/**
		* bu21013_free_irq() - frees IRQ registered for touchscreen
		* @bu21013_data: device structure pointer
		*
		* This function signals interrupt thread to stop processing and
		* frees interrupt.
		*/
		static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data)
		{
		bu21013_data->touch_stopped = true;
		wake_up(&bu21013_data->wait);
		free_irq(bu21013_data->chip->irq, bu21013_data);
		}

		/**
		* bu21013_probe() - initializes the i2c-client touchscreen driver
		* @client: i2c client structure pointer
		* @id: i2c device id pointer
		*
		* This function used to initializes the i2c-client touchscreen
		* driver and returns integer.
		*/
		static int __devinit bu21013_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct bu21013_ts_data *bu21013_data;
		struct input_dev *in_dev;
		const struct bu21013_platform_device *pdata =
		client->dev.platform_data;
		int error;

		if (!i2c_check_functionality(client->adapter,
		I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_err(&client->dev, "i2c smbus byte data not supported\n");
		return -EIO;
		}

		if (!pdata) {
		dev_err(&client->dev, "platform data not defined\n");
		return -EINVAL;
		}

		bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL);
		in_dev = input_allocate_device();
		if (!bu21013_data \|\| !in_dev) {
		dev_err(&client->dev, "device memory alloc failed\n");
		error = -ENOMEM;
		goto err_free_mem;
		}

		bu21013_data->in_dev = in_dev;
		bu21013_data->chip = pdata;
		bu21013_data->client = client;
		bu21013_data->touch_stopped = false;
		init_waitqueue_head(&bu21013_data->wait);

		/* configure the gpio pins */
		if (pdata->cs_en) {
		error = pdata->cs_en(pdata->cs_pin);
		if (error < 0) {
		dev_err(&client->dev, "chip init failed\n");
		goto err_free_mem;
		}
		}

		/* configure the touch panel controller */
		error = bu21013_init_chip(bu21013_data);
		if (error) {
		dev_err(&client->dev, "error in bu21013 config\n");
		goto err_cs_disable;
		}

		/* register the device to input subsystem */
		in_dev->name = DRIVER_TP;
		in_dev->id.bustype = BUS_I2C;
		in_dev->dev.parent = &client->dev;

		__set_bit(EV_SYN, in_dev->evbit);
		__set_bit(EV_KEY, in_dev->evbit);
		__set_bit(EV_ABS, in_dev->evbit);

		input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0,
		pdata->x_max_res, 0, 0);
		input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0,
		pdata->y_max_res, 0, 0);
		input_set_drvdata(in_dev, bu21013_data);

		error = request_threaded_irq(pdata->irq, NULL, bu21013_gpio_irq,
		IRQF_TRIGGER_FALLING \| IRQF_SHARED,
		DRIVER_TP, bu21013_data);
		if (error) {
		dev_err(&client->dev, "request irq %d failed\n", pdata->irq);
		goto err_cs_disable;
		}

		error = input_register_device(in_dev);
		if (error) {
		dev_err(&client->dev, "failed to register input device\n");
		goto err_free_irq;
		}

		device_init_wakeup(&client->dev, pdata->wakeup);
		i2c_set_clientdata(client, bu21013_data);

		return 0;

		err_free_irq:
		bu21013_free_irq(bu21013_data);
		err_cs_disable:
		pdata->cs_dis(pdata->cs_pin);
		err_free_mem:
		input_free_device(bu21013_data->in_dev);
		kfree(bu21013_data);

		return error;
		}
		/**
		* bu21013_remove() - removes the i2c-client touchscreen driver
		* @client: i2c client structure pointer
		*
		* This function uses to remove the i2c-client
		* touchscreen driver and returns integer.
		*/
		static int __devexit bu21013_remove(struct i2c_client *client)
		{
		struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client);

		bu21013_free_irq(bu21013_data);

		bu21013_data->chip->cs_dis(bu21013_data->chip->cs_pin);

		input_unregister_device(bu21013_data->in_dev);
		kfree(bu21013_data);

		device_init_wakeup(&client->dev, false);

		return 0;
		}

		#ifdef CONFIG_PM
		/**
		* bu21013_suspend() - suspend the touch screen controller
		* @dev: pointer to device structure
		*
		* This function is used to suspend the
		* touch panel controller and returns integer
		*/
		static int bu21013_suspend(struct device *dev)
		{
		struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
		struct i2c_client *client = bu21013_data->client;

		bu21013_data->touch_stopped = true;
		if (device_may_wakeup(&client->dev))
		enable_irq_wake(bu21013_data->chip->irq);
		else
		disable_irq(bu21013_data->chip->irq);

		return 0;
		}

		/**
		* bu21013_resume() - resume the touch screen controller
		* @dev: pointer to device structure
		*
		* This function is used to resume the touch panel
		* controller and returns integer.
		*/
		static int bu21013_resume(struct device *dev)
		{
		struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
		struct i2c_client *client = bu21013_data->client;
		int retval;

		retval = bu21013_init_chip(bu21013_data);
		if (retval < 0) {
		dev_err(&client->dev, "bu21013 controller config failed\n");
		return retval;
		}

		bu21013_data->touch_stopped = false;

		if (device_may_wakeup(&client->dev))
		disable_irq_wake(bu21013_data->chip->irq);
		else
		enable_irq(bu21013_data->chip->irq);

		return 0;
		}

		static const struct dev_pm_ops bu21013_dev_pm_ops = {
		.suspend = bu21013_suspend,
		.resume = bu21013_resume,
		};
		#endif

		static const struct i2c_device_id bu21013_id[] = {
		{ DRIVER_TP, 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, bu21013_id);

		static struct i2c_driver bu21013_driver = {
		.driver = {
		.name = DRIVER_TP,
		.owner = THIS_MODULE,
		#ifdef CONFIG_PM
		.pm = &bu21013_dev_pm_ops,
		#endif
		},
		.probe = bu21013_probe,
		.remove = __devexit_p(bu21013_remove),
		.id_table = bu21013_id,
		};

		/**
		* bu21013_init() - initializes the bu21013 touchscreen driver
		*
		* This function used to initializes the bu21013
		* touchscreen driver and returns integer.
		*/
		static int __init bu21013_init(void)
		{
		return i2c_add_driver(&bu21013_driver);
		}

		/**
		* bu21013_exit() - de-initializes the bu21013 touchscreen driver
		*
		* This function uses to de-initializes the bu21013
		* touchscreen driver and returns none.
		*/
		static void __exit bu21013_exit(void)
		{
		i2c_del_driver(&bu21013_driver);
		}

		module_init(bu21013_init);
		module_exit(bu21013_exit);

		MODULE_LICENSE("GPL v2");
		MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
		MODULE_DESCRIPTION("bu21013 touch screen controller driver");

include/linux/input/bu21013.h

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Original line number	Diff line number	Diff line
		/*
		* Copyright (C) ST-Ericsson SA 2010
		* Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
		* License terms:GNU General Public License (GPL) version 2
		*/

		#ifndef _BU21013_H
		#define _BU21013_H

		/**
		* struct bu21013_platform_device - Handle the platform data
		* @cs_en: pointer to the cs enable function
		* @cs_dis: pointer to the cs disable function
		* @irq_read_val: pointer to read the pen irq value function
		* @x_max_res: xmax resolution
		* @y_max_res: ymax resolution
		* @touch_x_max: touch x max
		* @touch_y_max: touch y max
		* @cs_pin: chip select pin
		* @irq: irq pin
		* @ext_clk: external clock flag
		* @x_flip: x flip flag
		* @y_flip: y flip flag
		* @wakeup: wakeup flag
		*
		* This is used to handle the platform data
		*/
		struct bu21013_platform_device {
		int (*cs_en)(int reset_pin);
		int (*cs_dis)(int reset_pin);
		int (*irq_read_val)(void);
		int x_max_res;
		int y_max_res;
		int touch_x_max;
		int touch_y_max;
		unsigned int cs_pin;
		unsigned int irq;
		bool ext_clk;
		bool x_flip;
		bool y_flip;
		bool wakeup;
		};

		#endif