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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