[PATCHv2] input: ROHM BU21013 touch panel controller support

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From: Naveen Kumar Gaddipati <naveen.gaddipati@xxxxxxxxxxxxxx>

Added the ROHM BU21013 capacitive touch panel controller
driver support with i2c interface.

Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxxxxxx>
Signed-off-by: Naveen Kumar Gaddipati <naveen.gaddipati@xxxxxxxxxxxxxx>
---
Modifications in v2:
	--Updated with the Dmitry comments on Patch v1
	--Updated with the Trilok comments on Patch v1

 drivers/input/touchscreen/Kconfig      |   12 +
 drivers/input/touchscreen/Makefile     |    1 +
 drivers/input/touchscreen/bu21013_ts.c |  770 ++++++++++++++++++++++++++++++++
 include/linux/input/bu21013.h          |   44 ++
 4 files changed, 827 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/touchscreen/bu21013_ts.c
 create mode 100644 include/linux/input/bu21013.h

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 0069d97..2380533 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -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
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 28217e1..a0a2021 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -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
diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c
new file mode 100644
index 0000000..54fd2bd
--- /dev/null
+++ b/drivers/input/touchscreen/bu21013_ts.c
@@ -0,0 +1,770 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Naveen Kumar G <naveen.gaddipati@xxxxxxxxxxxxxx> for ST-Ericsson
+ * License terms:GNU General Public License (GPL) version 2
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+#include <linux/input.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/input/bu21013.h>
+#include <linux/slab.h>
+
+#define PEN_DOWN_INTR			0
+#define PEN_UP_INTR			1
+#define RESET_DELAY			30
+#define POLLING_DELAY			100
+#define MAX_TOOL_WIDTH			15
+#define MAX_TOUCH_MAJOR			255
+#define MAX_TOUCH_MINOR			15
+#define MAX_PRESSURE			1
+#define PENUP_TIMEOUT			(2)
+#define DELTA_MIN			16
+#define MASK_BITS			0x03
+#define SHIFT_8				8
+#define SHIFT_2				2
+#define LENGTH_OF_BUFFER		11
+
+#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
+ * @chip:	pointer to the touch panel controller
+ * @in_dev:    pointer to the input device structure
+ * @wait: variable to wait_queue_head_t structure
+ * @intr_pin: interrupt pin value
+ * @touch_stopped: touch stop flag
+ * @x_pos: x position for two co-ordinates
+ * @y_pos: y position for two co-ordinates
+ * @previous_press_reported: last reported flag
+ *
+ * Touch panel device data structure
+ */
+struct bu21013_ts_data {
+	struct i2c_client *client;
+	struct bu21013_platform_device *chip;
+	struct input_dev *in_dev;
+	wait_queue_head_t wait;
+	bool touch_stopped;
+	unsigned int intr_pin;
+	signed short	x_pos[2];
+	signed short	y_pos[2];
+	bool previous_press_reported;
+};
+
+/**
+ * bu21013_report_pen_down() - reports the pen down event
+ * @data:bu21013_ts_data structure pointer
+ * @count:touch count
+ *
+ * This function used to report the pen down interrupt to
+ * input subsystem and returns none
+ */
+static void bu21013_report_pen_down(struct bu21013_ts_data *data, int count)
+{
+	int i;
+
+	input_report_abs(data->in_dev, ABS_X, data->x_pos[0]);
+	input_report_abs(data->in_dev, ABS_Y, data->y_pos[0]);
+	input_report_key(data->in_dev, BTN_TOUCH, count);
+
+	if (data->chip->multi_touch) {
+		for (i = 0; i < count; i++) {
+			input_report_abs(data->in_dev, ABS_MT_POSITION_X,
+							data->x_pos[i]);
+			input_report_abs(data->in_dev, ABS_MT_POSITION_Y,
+							data->y_pos[i]);
+			input_mt_sync(data->in_dev);
+		}
+	}
+	input_sync(data->in_dev);
+	data->previous_press_reported = count;
+}
+/**
+ * bu21013_report_pen_up() - reports the pen up event
+ * @data:bu21013_ts_data structure pointer
+ *
+ * This function used to report the pen up interrupt
+ * to input subsystem and returns none
+ */
+static void bu21013_report_pen_up(struct bu21013_ts_data *data)
+{
+	input_report_key(data->in_dev, BTN_TOUCH, 0);
+	if (data->chip->multi_touch) {
+		input_report_key(data->in_dev, BTN_2, 0);
+		input_mt_sync(data->in_dev);
+	}
+	input_sync(data->in_dev);
+	data->previous_press_reported = 0;
+}
+/**
+ * bu21013_touch_calc() - calculates the co-ordinates delta
+ * @data: bu21013_ts_data structure pointer
+ * @x: x position
+ * @y: y position
+ * @count: touch count
+ *
+ * This function calculates the exact co-ordinates with respect to
+ * display resolution and returns none
+ */
+static void bu21013_touch_calc
+	(struct bu21013_ts_data *data, int x, int y, int count)
+{
+	data->x_pos[count] = x;
+	data->y_pos[count] = y;
+	if (data->chip->x_flip)
+		data->x_pos[count] =
+			data->chip->touch_x_max - data->x_pos[count];
+	if (data->chip->y_flip)
+		data->y_pos[count] =
+			data->chip->touch_y_max - data->y_pos[count];
+}
+/**
+ * bu21013_verify_delta() - verify the co-ordinates delta
+ * @x1: x1 position
+ * @y1: y1 position
+ * @x2: x2 position
+ * @y2: y2 position
+ *
+ * This function verifies the delta of the
+ * co-ordinates and returns boolean.
+ */
+static bool bu21013_verify_delta(int x1, int y1, int x2, int y2)
+{
+	int delta_x, delta_y;
+
+	if ((x1 != 0) && (y1 != 0)) {
+		delta_x = x2 - x1;
+		if (x1 > x2)
+			delta_x = x1 - x2;
+		delta_y = y2 - y1;
+		if (y1 > y2)
+			delta_y = y1 - y2;
+		if ((delta_x < DELTA_MIN) || (delta_y < DELTA_MIN))
+			return false;
+	}
+	return true;
+}
+
+/**
+ * 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];
+	int	finger1_valid = 0;
+	int	finger2_valid = 0;
+	unsigned int	finger1_pos_x;
+	unsigned int	finger1_pos_y;
+	unsigned int	finger2_pos_x = 0;
+	unsigned int	finger2_pos_y = 0;
+	int	number_of_active_x_sensors;
+	int	number_of_active_y_sensors;
+	int	total_number_of_active_sensors;
+	int	finger_down_count = 0;
+	int	ret = 0;
+
+	if (data == NULL)
+		return -EINVAL;
+
+	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 -EINVAL;
+
+	number_of_active_x_sensors = hweight32(buf[0] &
+					BU21013_SENSORS_EN_0_7);
+	number_of_active_y_sensors = hweight32(
+			((buf[1] & BU21013_SENSORS_EN_8_15) |
+		((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
+	if (((number_of_active_x_sensors != 0) &&
+		(number_of_active_y_sensors == 0)) ||
+		((number_of_active_x_sensors == 0) &&
+		(number_of_active_y_sensors != 0)))
+		return 0;
+
+	total_number_of_active_sensors =
+		number_of_active_x_sensors + number_of_active_y_sensors;
+
+	finger1_pos_x = buf[3] << SHIFT_2 | (buf[4] & MASK_BITS);
+	finger1_pos_y = buf[5] << SHIFT_2 | (buf[6] & MASK_BITS);
+
+	if (data->chip->multi_touch) {
+		finger2_pos_x = buf[7] << SHIFT_2 | (buf[8] & MASK_BITS);
+		finger2_pos_y = buf[9] << SHIFT_2 | (buf[10] & MASK_BITS);
+	}
+
+	if (total_number_of_active_sensors) {
+		if ((finger2_pos_x != 0) && (finger2_pos_y != 0)) {
+			if ((finger1_pos_x == 0) || (finger1_pos_y == 0))
+				return 0;
+			ret = bu21013_verify_delta(finger1_pos_x,
+				finger1_pos_y, finger2_pos_x, finger2_pos_y);
+			if (!ret)
+				total_number_of_active_sensors = 0;
+		}
+	}
+
+	if (total_number_of_active_sensors) {
+		finger1_valid = 1;
+		if ((finger1_pos_x == 0) || (finger1_pos_y == 0) ||
+			(finger1_pos_x >= data->chip->touch_x_max) ||
+			(finger1_pos_y >= data->chip->touch_y_max))
+			finger1_valid = 0;
+		finger2_valid = 1;
+		if ((finger2_pos_x == 0) || (finger2_pos_y == 0) ||
+			(finger2_pos_x >= data->chip->touch_x_max) ||
+			(finger2_pos_y >= data->chip->touch_y_max))
+			finger2_valid = 0;
+		if ((finger1_valid == 0) && (finger2_valid == 0))
+			return 0;
+		if (finger1_valid) {
+			bu21013_touch_calc(data, finger1_pos_x,
+				finger1_pos_y, finger_down_count);
+			finger_down_count++;
+		}
+		if (finger2_valid) {
+			bu21013_touch_calc(data, finger2_pos_x,
+				finger2_pos_y, finger_down_count);
+			finger_down_count++;
+		}
+	}
+
+	if (finger_down_count > 0)
+		bu21013_report_pen_down(data, finger_down_count);
+	else {
+		if (data->previous_press_reported)
+			bu21013_report_pen_up(data);
+	}
+
+	return ret;
+}
+
+/**
+ * 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(10));
+	} 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");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+	if (data->chip->multi_touch)
+		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));
+	else
+		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));
+	if (retval < 0) {
+		dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+
+	retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG,
+					(BU21013_TH_ON_3 | BU21013_TH_ON_4));
+	if (retval < 0) {
+		dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n");
+		goto err;
+	}
+	retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG,
+							BU21013_TH_OFF_4);
+	if (retval < 0) {
+		dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+
+	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");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+	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");
+		goto err;
+	}
+
+	data->x_pos[0] = 0;
+	data->x_pos[1] = 0;
+	data->y_pos[0] = 0;
+	data->y_pos[1] = 0;
+	data->previous_press_reported = 0;
+
+err:
+	return retval;
+}
+
+#ifdef CONFIG_PM
+/**
+ * bu21013_suspend() - suspend the touch screen controller
+ * @client: pointer to i2c client structure
+ * @mesg: message from power manager
+ *
+ * This funtion is used to suspend the
+ * touch panel controller and returns integer
+ */
+static int bu21013_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+	struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client);
+
+	bu21013_data->touch_stopped = true;
+	wake_up(&bu21013_data->wait);
+	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
+ * @client: pointer to i2c client structure
+ *
+ * This funtion is used to resume the touch panel
+ * controller and returns integer.
+ */
+static int bu21013_resume(struct i2c_client *client)
+{
+	int retval;
+	struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client);
+
+	retval = bu21013_init_chip(bu21013_data);
+	if (retval < 0) {
+		dev_err(&client->dev, "tsc 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;
+}
+#endif
+
+/**
+ * bu21013_probe() - initialzes the i2c-client touchscreen driver
+ * @i2c: 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 *i2c,
+					const struct i2c_device_id *id)
+{
+	int retval;
+	struct bu21013_ts_data *bu21013_data;
+	struct input_dev *in_dev;
+	short x_max;
+	short y_max;
+	struct bu21013_platform_device *pdata = i2c->dev.platform_data;
+
+	if (!i2c) {
+		dev_err(&i2c->dev, "i2c client not defined\n");
+		retval = -EINVAL;
+		return retval;
+	}
+
+	if (!pdata) {
+		dev_err(&i2c->dev, "platform data not defined\n");
+		retval = -EINVAL;
+		return retval;
+	}
+
+	bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL);
+	if (!bu21013_data) {
+		dev_err(&i2c->dev, "device memory alloc failed\n");
+		retval = -ENOMEM;
+		return retval;
+	}
+
+	/* allocate input device */
+	in_dev = input_allocate_device();
+	if (!in_dev) {
+		dev_err(&i2c->dev, "input device memory alloc failed\n");
+		retval = -ENOMEM;
+		goto err_alloc;
+	}
+	bu21013_data->in_dev = in_dev;
+
+	bu21013_data->chip = pdata;
+	bu21013_data->client = i2c;
+	bu21013_data->touch_stopped = false;
+
+	x_max = pdata->x_max_res;
+	y_max = pdata->y_max_res;
+
+	init_waitqueue_head(&bu21013_data->wait);
+
+	i2c_set_clientdata(i2c, bu21013_data);
+
+	/* configure the gpio pins */
+	if (pdata->cs_en) {
+		retval = pdata->cs_en(pdata->cs_pin);
+		if (retval < 0) {
+			dev_err(&i2c->dev, "chip init failed\n");
+			goto err_init_cs;
+		}
+	}
+
+	/* configure the touch panel controller */
+	retval = bu21013_init_chip(bu21013_data);
+	if (retval < 0) {
+		dev_err(&i2c->dev, "error in bu21013 config\n");
+		goto err_init_config;
+	}
+
+	/* register the device to input subsystem */
+	in_dev->name = DRIVER_TP;
+	in_dev->id.bustype = BUS_I2C;
+	in_dev->dev.parent = &i2c->dev;
+	__set_bit(EV_SYN, in_dev->evbit);
+	__set_bit(EV_KEY, in_dev->evbit);
+	__set_bit(EV_ABS, in_dev->evbit);
+	__set_bit(BTN_TOUCH, in_dev->keybit);
+
+	input_set_abs_params(in_dev, ABS_X, 0, x_max, 0, 0);
+	input_set_abs_params(in_dev, ABS_Y, 0, y_max, 0, 0);
+	input_set_abs_params(in_dev, ABS_PRESSURE, 0, MAX_PRESSURE, 0, 0);
+	input_set_abs_params(in_dev, ABS_TOOL_WIDTH, 0, MAX_TOOL_WIDTH, 0, 0);
+
+	if (pdata->multi_touch) {
+		input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, x_max,
+									0, 0);
+		input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, y_max,
+									0, 0);
+		input_set_abs_params(in_dev, ABS_MT_TOUCH_MAJOR, 0,
+						MAX_TOUCH_MAJOR, 0, 0);
+		input_set_abs_params(in_dev, ABS_MT_TOUCH_MINOR, 0,
+						MAX_TOUCH_MINOR, 0, 0);
+		input_set_abs_params(in_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
+		input_set_abs_params(in_dev, ABS_MT_WIDTH_MAJOR, 0,
+						MAX_TOOL_WIDTH, 0, 0);
+	}
+	retval = input_register_device(in_dev);
+	if (retval)
+		goto err_input_register;
+
+	retval = request_threaded_irq(pdata->irq, NULL, bu21013_gpio_irq,
+					(IRQF_TRIGGER_FALLING | IRQF_SHARED),
+					DRIVER_TP, bu21013_data);
+	if (retval) {
+		dev_err(&i2c->dev, "request irq %d failed\n", pdata->irq);
+		goto err_init_irq;
+	}
+
+	return retval;
+
+err_init_irq:
+	input_unregister_device(bu21013_data->in_dev);
+	bu21013_data->in_dev = NULL;
+err_input_register:
+err_init_config:
+	pdata->cs_dis(pdata->cs_pin);
+err_init_cs:
+	input_free_device(bu21013_data->in_dev);
+err_alloc:
+	kfree(bu21013_data);
+
+	return retval;
+}
+/**
+ * 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 *data = i2c_get_clientdata(client);
+
+	data->touch_stopped = true;
+	free_irq(data->chip->irq, data);
+	data->chip->cs_dis(data->chip->cs_pin);
+	input_unregister_device(data->in_dev);
+	kfree(data);
+
+	return 0;
+}
+
+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,
+	},
+	.probe		=	bu21013_probe,
+#ifdef CONFIG_PM
+	.suspend	=	bu21013_suspend,
+	.resume		=	bu21013_resume,
+#endif
+	.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@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("bu21013 touch screen controller driver");
diff --git a/include/linux/input/bu21013.h b/include/linux/input/bu21013.h
new file mode 100644
index 0000000..6c64bda
--- /dev/null
+++ b/include/linux/input/bu21013.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Naveen Kumar G <naveen.gaddipati@xxxxxxxxxxxxxx> 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
+ * @multi_touch: multi_touch 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 multi_touch;
+};
+
+#endif
-- 
1.7.2.dirty

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