Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / input / touchscreen / bu21013_ts.c
diff --git a/kernel/drivers/input/touchscreen/bu21013_ts.c b/kernel/drivers/input/touchscreen/bu21013_ts.c
new file mode 100644 (file)
index 0000000..b9b5dda
--- /dev/null
@@ -0,0 +1,733 @@
+/*
+ * 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>
+#include <linux/regulator/consumer.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_gpio.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
+ * @regulator: pointer to the Regulator used for touch screen
+ *
+ * Touch panel device data structure
+ */
+struct bu21013_ts_data {
+       struct i2c_client *client;
+       wait_queue_head_t wait;
+       const struct bu21013_platform_device *chip;
+       struct input_dev *in_dev;
+       struct regulator *regulator;
+       unsigned int irq;
+       unsigned int intr_pin;
+       bool touch_stopped;
+};
+
+/**
+ * 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 = gpio_get_value(data->chip->touch_pin);
+               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->irq, bu21013_data);
+}
+
+/**
+ * bu21013_cs_disable() - deconfigures the touch panel controller
+ * @bu21013_data: device structure pointer
+ *
+ * This function is used to deconfigure the chip selection
+ * for touch panel controller.
+ */
+static void bu21013_cs_disable(struct bu21013_ts_data *bu21013_data)
+{
+       int error;
+
+       error = gpio_direction_output(bu21013_data->chip->cs_pin, 0);
+       if (error < 0)
+               dev_warn(&bu21013_data->client->dev,
+                        "%s: gpio direction failed, error: %d\n",
+                        __func__, error);
+       else
+               gpio_set_value(bu21013_data->chip->cs_pin, 0);
+
+       gpio_free(bu21013_data->chip->cs_pin);
+}
+
+#ifdef CONFIG_OF
+static const struct bu21013_platform_device *
+bu21013_parse_dt(struct device *dev)
+{
+       struct device_node *np = dev->of_node;
+       struct bu21013_platform_device *pdata;
+
+       if (!np) {
+               dev_err(dev, "no device tree or platform data\n");
+               return ERR_PTR(-EINVAL);
+       }
+
+       pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+       if (!pdata)
+               return ERR_PTR(-ENOMEM);
+
+       pdata->y_flip = pdata->x_flip = false;
+
+       pdata->x_flip = of_property_read_bool(np, "rohm,flip-x");
+       pdata->y_flip = of_property_read_bool(np, "rohm,flip-y");
+
+       of_property_read_u32(np, "rohm,touch-max-x", &pdata->touch_x_max);
+       of_property_read_u32(np, "rohm,touch-max-y", &pdata->touch_y_max);
+
+       pdata->touch_pin = of_get_named_gpio(np, "touch-gpio", 0);
+       pdata->cs_pin = of_get_named_gpio(np, "reset-gpio", 0);
+
+       pdata->ext_clk = false;
+
+       return pdata;
+}
+#else
+static inline const struct bu21013_platform_device *
+bu21013_parse_dt(struct device *dev)
+{
+       dev_err(dev, "no platform data available\n");
+       return ERR_PTR(-EINVAL);
+}
+#endif
+
+/**
+ * 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 bu21013_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       const struct bu21013_platform_device *pdata =
+                                       dev_get_platdata(&client->dev);
+       struct bu21013_ts_data *bu21013_data;
+       struct input_dev *in_dev;
+       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) {
+               pdata = bu21013_parse_dt(&client->dev);
+               if (IS_ERR(pdata))
+                       return PTR_ERR(pdata);
+       }
+
+       if (!gpio_is_valid(pdata->touch_pin)) {
+               dev_err(&client->dev, "invalid touch_pin supplied\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->irq = gpio_to_irq(pdata->touch_pin);
+
+       bu21013_data->regulator = regulator_get(&client->dev, "avdd");
+       if (IS_ERR(bu21013_data->regulator)) {
+               dev_err(&client->dev, "regulator_get failed\n");
+               error = PTR_ERR(bu21013_data->regulator);
+               goto err_free_mem;
+       }
+
+       error = regulator_enable(bu21013_data->regulator);
+       if (error < 0) {
+               dev_err(&client->dev, "regulator enable failed\n");
+               goto err_put_regulator;
+       }
+
+       bu21013_data->touch_stopped = false;
+       init_waitqueue_head(&bu21013_data->wait);
+
+       /* configure the gpio pins */
+       error = gpio_request_one(pdata->cs_pin, GPIOF_OUT_INIT_HIGH,
+                                "touchp_reset");
+       if (error < 0) {
+               dev_err(&client->dev, "Unable to request gpio reset_pin\n");
+               goto err_disable_regulator;
+       }
+
+       /* 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->touch_x_max, 0, 0);
+       input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0,
+                                               pdata->touch_y_max, 0, 0);
+       input_set_drvdata(in_dev, bu21013_data);
+
+       error = request_threaded_irq(bu21013_data->irq, NULL, bu21013_gpio_irq,
+                                    IRQF_TRIGGER_FALLING | IRQF_SHARED |
+                                       IRQF_ONESHOT,
+                                    DRIVER_TP, bu21013_data);
+       if (error) {
+               dev_err(&client->dev, "request irq %d failed\n",
+                       bu21013_data->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:
+       bu21013_cs_disable(bu21013_data);
+err_disable_regulator:
+       regulator_disable(bu21013_data->regulator);
+err_put_regulator:
+       regulator_put(bu21013_data->regulator);
+err_free_mem:
+       input_free_device(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 bu21013_remove(struct i2c_client *client)
+{
+       struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client);
+
+       bu21013_free_irq(bu21013_data);
+
+       bu21013_cs_disable(bu21013_data);
+
+       input_unregister_device(bu21013_data->in_dev);
+
+       regulator_disable(bu21013_data->regulator);
+       regulator_put(bu21013_data->regulator);
+
+       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->irq);
+       else
+               disable_irq(bu21013_data->irq);
+
+       regulator_disable(bu21013_data->regulator);
+
+       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 = regulator_enable(bu21013_data->regulator);
+       if (retval < 0) {
+               dev_err(&client->dev, "bu21013 regulator enable failed\n");
+               return 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->irq);
+       else
+               enable_irq(bu21013_data->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         =       bu21013_remove,
+       .id_table       =       bu21013_id,
+};
+
+module_i2c_driver(bu21013_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
+MODULE_DESCRIPTION("bu21013 touch screen controller driver");