Input: add ROHM BU21013 touch panel controller support

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

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Naveen Kumar Gaddipati <naveen.gaddipati@stericsson.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

4 files changed, 705 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index d59feb7b90f6..0ea361f23fa7 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 f1bc8a416824..99b353c4e9ae 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 000000000000..ccde58602563
--- /dev/null
+++ b/drivers/input/touchscreen/bu21013_ts.c
@@ -0,0 +1,648 @@
+/*
+ * 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");
diff --git a/include/linux/input/bu21013.h b/include/linux/input/bu21013.h
new file mode 100644
index 000000000000..e470d387dd49
--- /dev/null
+++ b/include/linux/input/bu21013.h
@@ -0,0 +1,44 @@
+/*
+ * 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