Input: add ROHM BU21013 touch panel controller support
authorNaveen Kumar Gaddipati <naveen.gaddipati@stericsson.com>
Tue, 5 Oct 2010 05:32:48 +0000 (22:32 -0700)
committerDmitry Torokhov <dmitry.torokhov@gmail.com>
Wed, 13 Oct 2010 14:49:27 +0000 (07:49 -0700)
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>
drivers/input/touchscreen/Kconfig
drivers/input/touchscreen/Makefile
drivers/input/touchscreen/bu21013_ts.c [new file with mode: 0644]
include/linux/input/bu21013.h [new file with mode: 0644]

index d59feb7b90f6d31126f44f5436eed68a11e32c11..0ea361f23fa7c1201e0d2e76a61e14e62ed58920 100644 (file)
@@ -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
index f1bc8a416824267617208f969c0aef26832806d1..99b353c4e9aebd08fc4ea7974bb6537304377c4f 100644 (file)
@@ -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 (file)
index 0000000..ccde586
--- /dev/null
@@ -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 (file)
index 0000000..e470d38
--- /dev/null
@@ -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