diff options
Diffstat (limited to 'drivers/input/touchscreen/bu21013_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/bu21013_ts.c | 931 |
1 files changed, 931 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c new file mode 100644 index 00000000000..de460a41d03 --- /dev/null +++ b/drivers/input/touchscreen/bu21013_ts.c @@ -0,0 +1,931 @@ +/* + * Copyright (C) ST-Ericsson SA 2009 + * 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/earlysuspend.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/clk.h> +#include <linux/regulator/consumer.h> + +#define PEN_DOWN_INTR 0 +#define RESET_DELAY 30 +#define PENUP_TIMEOUT 2 /* 2msecs */ +#define SCALE_FACTOR 1000 +#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_ts" + +/** + * 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 + * @enable: variable to indicate the enable/disable of touch screen + * @ext_clk_enable: true if running on ext clk + * @ext_clk_state: Saved state for suspend/resume of ext clk + * @factor_x: x scale factor + * @factor_y: y scale factor + * @tpclk: pointer to clock structure + * @early_suspend: early_suspend structure variable + * + * Touch panel device data structure + */ +struct bu21013_ts_data { + struct i2c_client *client; + wait_queue_head_t wait; + bool touch_stopped; + struct bu21013_platform_device *chip; + struct input_dev *in_dev; + unsigned int intr_pin; + struct regulator *regulator; + bool enable; + bool ext_clk_enable; + bool ext_clk_state; + unsigned int factor_x; + unsigned int factor_y; + struct clk *tpclk; + struct early_suspend early_suspend; +}; + +static int bu21013_init_chip(struct bu21013_ts_data *data, bool on_ext_clk); + +#ifdef CONFIG_HAS_EARLYSUSPEND +static void bu21013_ts_early_suspend(struct early_suspend *data); +static void bu21013_ts_late_resume(struct early_suspend *data); +#endif + +/** + * bu21013_ext_clk() - enable/disable the external clock + * @pdata: touch screen data + * @enable: enable external clock + * @reconfig: reconfigure chip upon external clock off. + * + * This function used to enable or disable the external clock and possible + * reconfigure hw. + */ +static int bu21013_ext_clk(struct bu21013_ts_data *pdata, bool enable, + bool reconfig) +{ + int retval = 0; + + if (!pdata->tpclk || pdata->ext_clk_enable == enable) + return retval; + + if (enable) { + pdata->ext_clk_enable = true; + clk_enable(pdata->tpclk); + retval = bu21013_init_chip(pdata, true); + } else { + pdata->ext_clk_enable = false; + if (reconfig) + retval = bu21013_init_chip(pdata, false); + clk_disable(pdata->tpclk); + } + return retval; +} + +/** + * bu21013_enable() - enable the touch driver event + * @pdata: touch screen data + * + * This function used to enable the driver and returns integer + */ +static int bu21013_enable(struct bu21013_ts_data *pdata) +{ + int retval; + + if (pdata->regulator) + regulator_enable(pdata->regulator); + + if (pdata->chip->cs_en) { + retval = pdata->chip->cs_en(pdata->chip->cs_pin); + if (retval < 0) { + dev_err(&pdata->client->dev, "enable hw failed\n"); + return retval; + } + } + + if (pdata->ext_clk_state) + retval = bu21013_ext_clk(pdata, true, true); + else + retval = bu21013_init_chip(pdata, false); + + if (retval < 0) { + dev_err(&pdata->client->dev, "enable hw failed\n"); + return retval; + } + pdata->touch_stopped = false; + enable_irq(pdata->chip->irq); + + return 0; +} + +/** + * bu21013_disable() - disable the touch driver event + * @pdata: touch screen data + * + * This function used to disable the driver and returns integer + */ +static void bu21013_disable(struct bu21013_ts_data *pdata) +{ + pdata->touch_stopped = true; + + pdata->ext_clk_state = pdata->ext_clk_enable; + (void) bu21013_ext_clk(pdata, false, false); + + disable_irq(pdata->chip->irq); + if (pdata->chip->cs_dis) + pdata->chip->cs_dis(pdata->chip->cs_pin); + if (pdata->regulator) + regulator_disable(pdata->regulator); +} + +/** + * bu21013_show_attr_enable() - show the touch screen controller status + * @dev: pointer to device structure + * @attr: pointer to device attribute + * @buf: parameter buffer + * + * This funtion is used to show whether the touch screen is enabled or + * disabled + */ +static ssize_t bu21013_show_attr_enable(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct bu21013_ts_data *pdata = dev_get_drvdata(dev); + return sprintf(buf, "%d\n", pdata->enable); +} + +/** + * bu21013_store_attr_enable() - Enable/Disable the touchscreen. + * @dev: pointer to device structure + * @attr: pointer to device attribute + * @buf: parameter buffer + * @count: number of parameters + * + * This funtion is used to enable or disable the touch screen controller. + */ +static ssize_t bu21013_store_attr_enable(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int ret = 0; + unsigned long val; + + struct bu21013_ts_data *pdata = dev_get_drvdata(dev); + + if (strict_strtoul(buf, 0, &val)) + return -EINVAL; + + if ((val != 0) && (val != 1)) + return -EINVAL; + + if (pdata->enable != val) { + pdata->enable = val ? true : false; + if (pdata->enable) { + ret = bu21013_enable(pdata); + if (ret < 0) + return ret; + } else + bu21013_disable(pdata); + } + return count; +} + +/** + * bu21013_show_attr_extclk() - shows the external clock status + * @dev: pointer to device structure + * @attr: pointer to device attribute + * @buf: parameter buffer + * + * This funtion is used to show whether the external clock for the touch + * screen is enabled or disabled. + */ +static ssize_t bu21013_show_attr_extclk(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct bu21013_ts_data *pdata = dev_get_drvdata(dev); + return sprintf(buf, "%d\n", pdata->ext_clk_enable); +} + +/** + * bu21013_store_attr_extclk() - Enable/Disable the external clock + * for the tocuh screen controller. + * @dev: pointer to device structure + * @attr: pointer to device attribute + * @buf: parameter buffer + * @count: number of parameters + * + * This funtion is used enabled or disable the external clock for the touch + * screen controller. + */ +static ssize_t bu21013_store_attr_extclk(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int retval = 0; + struct bu21013_ts_data *pdata = dev_get_drvdata(dev); + unsigned long val; + + if (strict_strtoul(buf, 0, &val)) + return -EINVAL; + + if ((val != 0) && (val != 1)) + return -EINVAL; + + if (pdata->chip->has_ext_clk) { + if (pdata->enable) + retval = bu21013_ext_clk(pdata, val, true); + else + pdata->ext_clk_state = val; + if (retval < 0) + return retval; + } + return count; +} + +static DEVICE_ATTR(enable, S_IWUSR | S_IRUGO, + bu21013_show_attr_enable, bu21013_store_attr_enable); + +static DEVICE_ATTR(ext_clk, S_IWUSR | S_IRUGO, + bu21013_show_attr_extclk, bu21013_store_attr_extclk); + + +static struct attribute *bu21013_attribute[] = { + &dev_attr_enable.attr, + &dev_attr_ext_clk.attr, + NULL, +}; + +static struct attribute_group bu21013_attr_group = { + .attrs = bu21013_attribute, +}; + + +/** + * 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 < 2; 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; + x = x * data->factor_x / SCALE_FACTOR; + y = y * data->factor_y / SCALE_FACTOR; + 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->portrait && data->chip->x_flip) + pos_x[i] = data->chip->x_max_res - pos_x[i]; + if (data->chip->portrait && data->chip->y_flip) + pos_y[i] = data->chip->y_max_res - pos_y[i]; + input_report_abs(data->in_dev, ABS_MT_TOUCH_MAJOR, + max(pos_x[i], 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(PENUP_TIMEOUT)); + } while (!data->intr_pin && !data->touch_stopped); + return IRQ_HANDLED; +} + +/** + * bu21013_init_chip() - power on sequence for the bu21013 controller + * @data: device structure pointer + * @on_ext_clk: Run on external clock + * + * This function is used to power on + * the bu21013 controller and returns integer. + */ +static int bu21013_init_chip(struct bu21013_ts_data *data, bool on_ext_clk) +{ + 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 (on_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; + } + + data->factor_x = (data->chip->x_max_res * SCALE_FACTOR / + data->chip->touch_x_max); + data->factor_y = (data->chip->y_max_res * SCALE_FACTOR / + data->chip->touch_y_max); + return retval; +} + +/** + * bu21013_probe() - initialzes 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) +{ + int retval; + struct bu21013_ts_data *bu21013_data; + struct input_dev *in_dev; + struct bu21013_platform_device *pdata = + client->dev.platform_data; + + 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"); + retval = -EINVAL; + return retval; + } + + bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL); + if (!bu21013_data) { + dev_err(&client->dev, "device memory alloc failed\n"); + retval = -ENOMEM; + return retval; + } + /* allocate input device */ + in_dev = input_allocate_device(); + if (!in_dev) { + dev_err(&client->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 = client; + + bu21013_data->regulator = regulator_get(&client->dev, "avdd"); + if (IS_ERR(bu21013_data->regulator)) { + dev_warn(&client->dev, "regulator_get failed\n"); + bu21013_data->regulator = NULL; + } + if (bu21013_data->regulator) + regulator_enable(bu21013_data->regulator); + + /* configure the gpio pins */ + if (pdata->cs_en) { + retval = pdata->cs_en(pdata->cs_pin); + if (retval < 0) { + dev_err(&client->dev, "chip init failed\n"); + goto err_init_cs; + } + } + + if (pdata->has_ext_clk) { + bu21013_data->tpclk = clk_get(&client->dev, NULL); + if (IS_ERR(bu21013_data->tpclk)) { + dev_warn(&client->dev, "get extern clock failed\n"); + bu21013_data->tpclk = NULL; + } + } + + if (pdata->enable_ext_clk && bu21013_data->tpclk) { + retval = clk_enable(bu21013_data->tpclk); + if (retval < 0) { + dev_err(&client->dev, "clock enable failed\n"); + goto err_ext_clk; + } + bu21013_data->ext_clk_enable = true; + } + + /* configure the touch panel controller */ + retval = bu21013_init_chip(bu21013_data, bu21013_data->ext_clk_enable); + if (retval < 0) { + dev_err(&client->dev, "error in bu21013 config\n"); + goto err_init_config; + } + + init_waitqueue_head(&bu21013_data->wait); + bu21013_data->touch_stopped = false; + + /* 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_abs_params(in_dev, ABS_MT_TOUCH_MAJOR, 0, + max(pdata->x_max_res , pdata->y_max_res), 0, 0); + input_set_drvdata(in_dev, bu21013_data); + 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(&client->dev, "request irq %d failed\n", pdata->irq); + goto err_init_irq; + } + bu21013_data->enable = true; + i2c_set_clientdata(client, bu21013_data); + + /* sysfs implementation for dynamic enable/disable the input event */ + retval = sysfs_create_group(&client->dev.kobj, &bu21013_attr_group); + if (retval) { + dev_err(&client->dev, "failed to create sysfs entries\n"); + goto err_sysfs_create; + } + +#ifdef CONFIG_HAS_EARLYSUSPEND + bu21013_data->early_suspend.level = + EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1; + bu21013_data->early_suspend.suspend = bu21013_ts_early_suspend; + bu21013_data->early_suspend.resume = bu21013_ts_late_resume; + register_early_suspend(&bu21013_data->early_suspend); +#endif + return retval; + +err_sysfs_create: + free_irq(pdata->irq, bu21013_data); + i2c_set_clientdata(client, NULL); +err_init_irq: + input_unregister_device(bu21013_data->in_dev); +err_input_register: + wake_up(&bu21013_data->wait); +err_init_config: + if (bu21013_data->tpclk) { + if (bu21013_data->ext_clk_enable) + clk_disable(bu21013_data->tpclk); + clk_put(bu21013_data->tpclk); + } +err_ext_clk: + if (pdata->cs_dis) + pdata->cs_dis(pdata->cs_pin); +err_init_cs: + if (bu21013_data->regulator) { + regulator_disable(bu21013_data->regulator); + regulator_put(bu21013_data->regulator); + } + 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 *bu21013_data = i2c_get_clientdata(client); + + bu21013_data->touch_stopped = true; + sysfs_remove_group(&client->dev.kobj, &bu21013_attr_group); + wake_up(&bu21013_data->wait); + free_irq(bu21013_data->chip->irq, bu21013_data); + bu21013_data->chip->cs_dis(bu21013_data->chip->cs_pin); + input_unregister_device(bu21013_data->in_dev); + + if (bu21013_data->tpclk) { + if (bu21013_data->ext_clk_enable) + clk_disable(bu21013_data->tpclk); + clk_put(bu21013_data->tpclk); + } + if (bu21013_data->regulator) { + regulator_disable(bu21013_data->regulator); + regulator_put(bu21013_data->regulator); + } + kfree(bu21013_data); + + return 0; +} + +#if !defined(CONFIG_HAS_EARLYSUSPEND) && defined(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); + + bu21013_disable(bu21013_data); + + 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); + + return bu21013_enable(bu21013_data); +} + +static const struct dev_pm_ops bu21013_dev_pm_ops = { + .suspend = bu21013_suspend, + .resume = bu21013_resume, +}; + +#else +static void bu21013_ts_early_suspend(struct early_suspend *data) +{ + struct bu21013_ts_data *bu21013_data = + container_of(data, struct bu21013_ts_data, early_suspend); + bu21013_disable(bu21013_data); +} + +static void bu21013_ts_late_resume(struct early_suspend *data) +{ + struct bu21013_ts_data *bu21013_data = + container_of(data, struct bu21013_ts_data, early_suspend); + struct i2c_client *client = bu21013_data->client; + int retval; + + retval = bu21013_enable(bu21013_data); + if (retval < 0) + dev_err(&client->dev, "bu21013 enable failed\n"); +} +#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, +#if !defined(CONFIG_HAS_EARLYSUSPEND) && defined(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"); |