drivers/input/touchscreen/gt9xx.c

/* drivers/input/touchscreen/gt813_827_828.c
 *
 * 2010 - 2012 Goodix Technology.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be a reference
 * to you, when you are integrating the GOODiX's CTP IC into your system,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * Version:1.0
 * Author:andrew@goodix.com
 * Release Date:2012/08/31
 * Revision record:
 *      V1.0:2012/08/31,first Release
 *
 */

#include <linux/irq.h>
#include <linux/i2c/gt9xx.h>

#if GTP_ICS_SLOT_REPORT
#include <linux/input/mt.h>
#endif
static u8 cfg_len;
static u8 int_type;
static const char *goodix_ts_name = "Goodix-TS";
static struct workqueue_struct *goodix_wq;
struct i2c_client *i2c_connect_client;
static u8 config[GTP_CONFIG_MAX_LENGTH + GTP_ADDR_LENGTH]
= { GTP_REG_CONFIG_DATA >> 8, GTP_REG_CONFIG_DATA & 0xff };

#if GTP_HAVE_TOUCH_KEY
static const u16 touch_key_array[] = GTP_KEY_TAB;
#define GTP_MAX_KEY_NUM	 (sizeof(touch_key_array)/sizeof(touch_key_array[0]))
#endif

static s8 gtp_i2c_test(struct i2c_client *client);

#ifdef CONFIG_HAS_EARLYSUSPEND
static void goodix_ts_early_suspend(struct early_suspend *h);
static void goodix_ts_late_resume(struct early_suspend *h);
#endif

#if GTP_ESD_PROTECT
static struct delayed_work gtp_esd_check_work;
static struct workqueue_struct *gtp_esd_check_workqueue;
static void gtp_esd_check_func(struct work_struct *);
#endif

static BLOCKING_NOTIFIER_HEAD(touch_key_notifier);

int register_touch_key_notifier(struct notifier_block *n)
{
	return blocking_notifier_chain_register(&touch_key_notifier, n);
}

int unregister_touch_key_notifier(struct notifier_block *n)
{
	return blocking_notifier_chain_unregister(&touch_key_notifier, n);
}

/*******************************************************
Function:
	Read data from the i2c slave device.

Input:
	client:	i2c device.
	buf[0]:operate address.
	buf[1]~buf[len]:read data buffer.
	len:operate length.

Output:
	numbers of i2c_msgs to transfer
*********************************************************/
s32 gtp_i2c_read(struct i2c_client *client, u8 *buf, s32 len)
{
	struct i2c_msg msgs[2];
	s32 ret = -1;
	s32 retries = 0;

	GTP_DEBUG_FUNC();

	msgs[0].flags = !I2C_M_RD;
	msgs[0].addr = client->addr;
	msgs[0].len = GTP_ADDR_LENGTH;
	msgs[0].buf = &buf[0];

	msgs[1].flags = I2C_M_RD;
	msgs[1].addr = client->addr;
	msgs[1].len = len - GTP_ADDR_LENGTH;
	msgs[1].buf = &buf[GTP_ADDR_LENGTH];

	while (retries < 5) {
		ret = i2c_transfer(client->adapter, msgs, 2);
		if (ret == 2)
			break;
		retries++;
	}
	if (retries >= 5) {
		GTP_DEBUG("I2C retry timeout, reset chip.");
		gtp_reset_guitar(client, 10);
	}
	return ret;
}

/*******************************************************
Function:
	write data to the i2c slave device.

Input:
	client:	i2c device.
	buf[0]:operate address.
	buf[1]~buf[len]:write data buffer.
	len:operate length.

Output:
	numbers of i2c_msgs to transfer.
*********************************************************/
s32 gtp_i2c_write(struct i2c_client *client, u8 *buf, s32 len)
{
	struct i2c_msg msg;
	s32 ret = -1;
	s32 retries = 0;

	GTP_DEBUG_FUNC();

	msg.flags = !I2C_M_RD;
	msg.addr = client->addr;
	msg.len = len;
	msg.buf = buf;

	while (retries < 5) {
		ret = i2c_transfer(client->adapter, &msg, 1);
		if (ret == 1)
			break;
		retries++;
	}
	if (retries >= 5) {
		GTP_DEBUG("I2C retry timeout, reset chip.");
		gtp_reset_guitar(client, 10);
	}
	return ret;
}

/*******************************************************
Function:
	Send config Function.

Input:
	client:	i2c client.

Output:
	Executive outcomes.0--success,non-0--fail.
*******************************************************/
s32 gtp_send_cfg(struct i2c_client *client)
{
	s32 ret = 0;

#if GTP_DRIVER_SEND_CFG
	s32 retry = 0;

	for (retry = 0; retry < 5; retry++) {
		ret =
		    gtp_i2c_write(client, config,
				  GTP_CONFIG_MAX_LENGTH + GTP_ADDR_LENGTH);
		if (ret > 0)
			break;
	}
#endif

	return ret;
}

/*******************************************************
Function:
	Enable IRQ Function.

Input:
	ts:	i2c client private struct.

Output:
	None.
*******************************************************/
void gtp_irq_disable(struct goodix_ts_data *ts)
{
	unsigned long irqflags;

	GTP_DEBUG_FUNC();

	spin_lock_irqsave(&ts->irq_lock, irqflags);
	if (!ts->irq_is_disable) {
		ts->irq_is_disable = 1;
		disable_irq_nosync(ts->client->irq);
	}
	spin_unlock_irqrestore(&ts->irq_lock, irqflags);
}

/*******************************************************
Function:
	Disable IRQ Function.

Input:
	ts:	i2c client private struct.

Output:
	None.
*******************************************************/
void gtp_irq_enable(struct goodix_ts_data *ts)
{
	unsigned long irqflags = 0;

	GTP_DEBUG_FUNC();

	spin_lock_irqsave(&ts->irq_lock, irqflags);
	if (ts->irq_is_disable) {
		enable_irq(ts->client->irq);
		ts->irq_is_disable = 0;
	}
	spin_unlock_irqrestore(&ts->irq_lock, irqflags);
}

/*******************************************************
Function:
	Touch down report function.

Input:
	ts:private data.
	id:tracking id.
	x:input x.
	y:input y.
	w:input weight.

Output:
	None.
*******************************************************/
static void gtp_touch_down(struct goodix_ts_data *ts, s32 id, s32 x, s32 y,
			   s32 w)
{
#if GTP_CHANGE_X2Y
	GTP_SWAP(x, y);
#endif

#if GTP_ICS_SLOT_REPORT
	input_mt_slot(ts->input_dev, id);
	input_report_abs(ts->input_dev, ABS_MT_TRACKING_ID, id);
	input_report_abs(ts->input_dev, ABS_MT_POSITION_X, x);
	input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, y);
	input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, w);
	input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, w);
#else
	input_report_abs(ts->input_dev, ABS_MT_POSITION_X, x);
	input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, y);
	input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, w);
	input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, w);
	input_report_abs(ts->input_dev, ABS_MT_TRACKING_ID, id);
	input_report_key(ts->input_dev, BTN_TOUCH, 1);
	input_mt_sync(ts->input_dev);
#endif

	GTP_DEBUG("ID:%d, X:%d, Y:%d, W:%d", id, x, y, w);
}

/*******************************************************
Function:
	Touch up report function.

Input:
	ts:private data.

Output:
	None.
*******************************************************/
static void gtp_touch_up(struct goodix_ts_data *ts, s32 id)
{
#if GTP_ICS_SLOT_REPORT
	input_mt_slot(ts->input_dev, id);
	input_report_abs(ts->input_dev, ABS_MT_TRACKING_ID, -1);
	GTP_DEBUG("Touch id[%2d] release!", id);
#else
	input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0);
	input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0);
	input_report_key(ts->input_dev, BTN_TOUCH, 0);
	input_mt_sync(ts->input_dev);
#endif
}

/*******************************************************
Function:
	Goodix touchscreen work function.

Input:
	work:	work_struct of goodix_wq.

Output:
	None.
*******************************************************/
static void goodix_ts_work_func(struct work_struct *work)
{
	u8 end_cmd[3] = {
	    GTP_READ_COOR_ADDR >> 8, GTP_READ_COOR_ADDR & 0xFF, 0 };
	u8 point_data[2 + 1 + 8 * GTP_MAX_TOUCH + 1] = {
	    GTP_READ_COOR_ADDR >> 8, GTP_READ_COOR_ADDR & 0xFF };
	u8 touch_num = 0;
	u8 finger = 0;
	static u8 pre_touch;
	static u8 pre_key;
	u8 key_value = 0;
	u8 *coor_data = NULL;
	s32 input_x = 0;
	s32 input_y = 0;
	s32 input_w = 0;
	s32 id = 0;
	s32 i = 0;
	s32 ret = -1;
	struct goodix_ts_data *ts = NULL;

	GTP_DEBUG_FUNC();

	ts = container_of(work, struct goodix_ts_data, work);
	if (ts->enter_update)
		return;

	ret = gtp_i2c_read(ts->client, point_data, 12);
	if (ret < 0) {
		GTP_ERROR("I2C transfer error. errno:%d\n ", ret);
		goto exit_work_func;
	}

	finger = point_data[GTP_ADDR_LENGTH];
	if ((finger & 0x80) == 0)
		goto exit_work_func;

	touch_num = finger & 0x0f;
	if (touch_num > GTP_MAX_TOUCH)
		goto exit_work_func;

	if (touch_num > 1) {
		u8 buf[8 * GTP_MAX_TOUCH] = {
			(GTP_READ_COOR_ADDR + 10) >> 8,
			(GTP_READ_COOR_ADDR + 10) & 0xff };

		ret = gtp_i2c_read(ts->client, buf, 2 + 8 * (touch_num - 1));
		memcpy(&point_data[12], &buf[2], 8 * (touch_num - 1));
	}
#if GTP_HAVE_TOUCH_KEY
	key_value = point_data[3 + 8 * touch_num];

	if (key_value || pre_key) {
		for (i = 0; i < GTP_MAX_KEY_NUM; i++) {
			input_report_key(ts->input_dev, touch_key_array[i],
					 key_value & (0x01 << i));
		}
		touch_num = 0;
		pre_touch = 0;
	}
#endif
	pre_key = key_value;

	GTP_DEBUG("pre_touch:%02x, finger:%02x.", pre_touch, finger);

#if GTP_ICS_SLOT_REPORT
	if (pre_touch || touch_num) {
		s32 pos = 0;

		coor_data = &point_data[3];
		id = coor_data[pos];

		for (i = 0; i < GTP_MAX_TOUCH; i++) {
			if (i == id) {
				input_x =
				    coor_data[pos + 1] | coor_data[pos +
								   2] << 8;
				input_y =
				    coor_data[pos + 3] | coor_data[pos +
								   4] << 8;
				input_w =
				    coor_data[pos + 5] | coor_data[pos +
								   6] << 8;

				gtp_touch_down(ts, id, input_x, input_y,
					       input_w);
				pre_touch |= 0x01 << i;

				pos += 8;
				id = coor_data[pos];
			} else if (pre_touch & (0x01 << i)) {
				gtp_touch_up(ts, i);
				pre_touch &= ~(0x01 << i);
			}
		}
	}
#else
	if (touch_num) {
		for (i = 0; i < touch_num; i++) {
			coor_data = &point_data[i * 8 + 3];

			id = coor_data[0];
			input_x = coor_data[1] | coor_data[2] << 8;
			input_y = coor_data[3] | coor_data[4] << 8;
			input_w = coor_data[5] | coor_data[6] << 8;

			gtp_touch_down(ts, id, input_x, input_y, input_w);
		}
	} else if (pre_touch) {
		GTP_DEBUG("Touch Release!");
		gtp_touch_up(ts, 0);
	}

	pre_touch = touch_num;
	input_report_key(ts->input_dev, BTN_TOUCH, (touch_num || key_value));
#endif

	input_sync(ts->input_dev);

exit_work_func:
	if (!ts->gtp_rawdiff_mode) {
		ret = gtp_i2c_write(ts->client, end_cmd, 3);
		if (ret < 0)
			GTP_INFO("I2C write end_cmd  error!");
	}

	if (ts->use_irq)
		gtp_irq_enable(ts);
}

/*******************************************************
Function:
	Timer interrupt service routine.

Input:
	timer:	timer struct pointer.

Output:
	Timer work mode. HRTIMER_NORESTART---not restart mode
*******************************************************/
static enum hrtimer_restart goodix_ts_timer_handler(struct hrtimer *timer)
{
	struct goodix_ts_data *ts =
	    container_of(timer, struct goodix_ts_data, timer);

	GTP_DEBUG_FUNC();

	queue_work(goodix_wq, &ts->work);
	hrtimer_start(&ts->timer, ktime_set(0, (GTP_POLL_TIME + 6) * 1000000),
		      HRTIMER_MODE_REL);
	return HRTIMER_NORESTART;
}

/*******************************************************
Function:
	External interrupt service routine.

Input:
	irq:	interrupt number.
	dev_id: private data pointer.

Output:
	irq execute status.
*******************************************************/
static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
{
	struct goodix_ts_data *ts = dev_id;

	GTP_DEBUG_FUNC();

	gtp_irq_disable(ts);
	queue_work(goodix_wq, &ts->work);

	return IRQ_HANDLED;
}

/*******************************************************
Function:
	Reset chip Function.

Input:
	ms:reset time.

Output:
	None.
*******************************************************/
void gtp_reset_guitar(struct i2c_client *client, s32 ms)
{
	GTP_DEBUG_FUNC();

	GTP_GPIO_OUTPUT(g_rst_pin, 0);
	msleep(ms);
	GTP_GPIO_OUTPUT(g_int_pin, client->addr == 0x14);

	msleep(2);
	GTP_GPIO_OUTPUT(g_rst_pin, 1);

	msleep(60);		/* must > 3ms */
	GTP_GPIO_AS_INT(g_int_pin);
	msleep(5);
	return;
}

/*******************************************************
Function:
	Eter sleep function.

Input:
	ts:private data.

Output:
	Executive outcomes.0--success,non-0--fail.
*******************************************************/
static s8 gtp_enter_sleep(struct goodix_ts_data *ts)
{
	s8 ret = -1;
	s8 retry = 0;
	u8 i2c_control_buf[3] = {
	    (u8)(GTP_REG_SLEEP >> 8), (u8)GTP_REG_SLEEP, 5 };

	GTP_DEBUG_FUNC();

	GTP_GPIO_OUTPUT(g_int_pin, 0);
	msleep(5);
	while (retry++ < 5) {
		ret = gtp_i2c_write(ts->client, i2c_control_buf, 3);
		if (ret > 0) {
			GTP_DEBUG("GTP enter sleep!");
			return ret;
		}
		msleep(10);
	}
	GTP_ERROR("GTP send sleep cmd failed.");
	return ret;
}

/*******************************************************
Function:
	Wakeup from sleep mode Function.

Input:
	ts:	private data.

Output:
	Executive outcomes.0--success,non-0--fail.
*******************************************************/
static s8 gtp_wakeup_sleep(struct goodix_ts_data *ts)
{
	u8 retry = 0;
	s8 ret = -1;

	GTP_DEBUG_FUNC();

	GTP_GPIO_AS_INT(g_int_pin);
	msleep(10);

#if GTP_POWER_CTRL_SLEEP
	while (retry++ < 5) {
		gtp_reset_guitar(ts->client, 20);
		ret = gtp_send_cfg(ts->client);
		if (ret > 0) {
			GTP_DEBUG("Wakeup sleep send config success.");
			return ret;
		}
	}
#else
	while (retry++ < 10) {
		ret = gtp_i2c_test(ts->client);
		if (ret > 0) {
			GTP_DEBUG("GTP wakeup sleep.");
			return ret;
		}
		gtp_reset_guitar(ts->client, 20);
	}
#endif

	GTP_ERROR("GTP wakeup sleep failed.");
	return ret;
}

/*******************************************************
Function:
	GTP initialize function.

Input:
	ts:	i2c client private struct.

Output:
	Executive outcomes.0---succeed.
*******************************************************/
static s32 gtp_init_panel(struct goodix_ts_data *ts)
{
	s32 ret = -1;

#if GTP_DRIVER_SEND_CFG
	s32 i;
	u8 check_sum = 0;
	u8 rd_cfg_buf[16];

	u8 cfg_info_group1[] = CTP_CFG_GROUP1;
	u8 cfg_info_group2[] = CTP_CFG_GROUP2;
	u8 cfg_info_group3[] = CTP_CFG_GROUP3;
	u8 *send_cfg_buf[3] = {
	    cfg_info_group1, cfg_info_group2, cfg_info_group3 };
	u8 cfg_info_len[3] = {
	    sizeof(cfg_info_group1) / sizeof(cfg_info_group1[0]),
		sizeof(cfg_info_group2) / sizeof(cfg_info_group2[0]),
		sizeof(cfg_info_group3) / sizeof(cfg_info_group3[0])
	};
	for (i = 0; i < 3; i++) {
		if (cfg_info_len[i] > ts->gtp_cfg_len)
			ts->gtp_cfg_len = cfg_info_len[i];
	}
	GTP_DEBUG("len1=%d,len2=%d,len3=%d,send_len:%d", cfg_info_len[0],
		  cfg_info_len[1], cfg_info_len[2], ts->gtp_cfg_len);
	if ((!cfg_info_len[1]) && (!cfg_info_len[2])) {
		rd_cfg_buf[GTP_ADDR_LENGTH] = 0;
	} else {
		rd_cfg_buf[0] = GTP_REG_SENSOR_ID >> 8;
		rd_cfg_buf[1] = GTP_REG_SENSOR_ID & 0xff;
		ret = gtp_i2c_read(ts->client, rd_cfg_buf, 3);
		if (ret < 0) {
			GTP_ERROR
			("Read SENSOR ID failed,default use group1 config!");
			rd_cfg_buf[GTP_ADDR_LENGTH] = 0;
		}
		rd_cfg_buf[GTP_ADDR_LENGTH] &= 0x03;
	}
	GTP_DEBUG("SENSOR ID:%d", rd_cfg_buf[GTP_ADDR_LENGTH]);
	memset(&config[GTP_ADDR_LENGTH], 0, GTP_CONFIG_MAX_LENGTH);
	memcpy(&config[GTP_ADDR_LENGTH],
	       send_cfg_buf[rd_cfg_buf[GTP_ADDR_LENGTH]], ts->gtp_cfg_len);

#if GTP_CUSTOM_CFG
	config[RESOLUTION_LOC] = (u8)g_x_max_value;
	config[RESOLUTION_LOC + 1] = (u8)(g_x_max_value >> 8);
	config[RESOLUTION_LOC + 2] = (u8)g_y_max_value;
	config[RESOLUTION_LOC + 3] = (u8)(g_y_max_value >> 8);

	if (GTP_INT_TRIGGER == 0)	/* RISING */
		config[TRIGGER_LOC] &= 0xfe;
	else if (GTP_INT_TRIGGER == 1)	/* FALLING */
		config[TRIGGER_LOC] |= 0x01;
#endif /* endif GTP_CUSTOM_CFG */

	check_sum = 0;
	for (i = GTP_ADDR_LENGTH; i < ts->gtp_cfg_len; i++)
		check_sum += config[i];
	config[ts->gtp_cfg_len] = (~check_sum) + 1;

#else /* else DRIVER NEED NOT SEND CONFIG */

	if (ts->gtp_cfg_len == 0)
		ts->gtp_cfg_len = GTP_CONFIG_MAX_LENGTH;
	ret =
	    gtp_i2c_read(ts->client, config, ts->gtp_cfg_len + GTP_ADDR_LENGTH);
	if (ret < 0) {
		GTP_ERROR("GTP read resolution & max_touch_num failed,");
		GTP_ERROR("use default value!");

		ts->abs_x_max = g_x_max_value;
		ts->abs_y_max = g_y_max_value;
		ts->int_trigger_type = GTP_INT_TRIGGER;
	}
#endif /* endif GTP_DRIVER_SEND_CFG */

	GTP_DEBUG_FUNC();

	ts->abs_x_max =
	    (config[RESOLUTION_LOC + 1] << 8) + config[RESOLUTION_LOC];
	ts->abs_y_max =
	    (config[RESOLUTION_LOC + 3] << 8) + config[RESOLUTION_LOC + 2];
	ts->int_trigger_type = (config[TRIGGER_LOC]) & 0x03;
	if ((!ts->abs_x_max) || (!ts->abs_y_max)) {
		GTP_ERROR("GTP resolution & max_touch_num invalid,");
		GTP_ERROR("use default value!");

		ts->abs_x_max = g_x_max_value;
		ts->abs_y_max = g_y_max_value;
	}

	ret = gtp_send_cfg(ts->client);
	if (ret < 0)
		GTP_ERROR("Send config error.");

	GTP_DEBUG("X_MAX = %d,Y_MAX = %d,TRIGGER = 0x%02x",
		  ts->abs_x_max, ts->abs_y_max, ts->int_trigger_type);

	msleep(10);

	return 0;
}

/*******************************************************
Function:
	Read goodix touchscreen version function.

Input:
	client:	i2c client struct.
	version:address to store version info

Output:
	Executive outcomes.0---succeed.
*******************************************************/
s32 gtp_read_version(struct i2c_client *client, u16 *version)
{
	s32 ret = -1;
	s32 i = 0;
	u8 buf[8] = { GTP_REG_VERSION >> 8, GTP_REG_VERSION & 0xff };

	GTP_DEBUG_FUNC();

	ret = gtp_i2c_read(client, buf, sizeof(buf));
	if (ret < 0) {
		GTP_ERROR("GTP read version failed");
		return ret;
	}

	if (version)
		*version = (buf[7] << 8) | buf[6];

	for (i = 2; i < 6; i++) {
		if (!buf[i])
			buf[i] = 0x30;
	}
	GTP_INFO("IC VERSION:%c%c%c%c_%02x%02x",
		 buf[2], buf[3], buf[4], buf[5], buf[7], buf[6]);

	return ret;
}

/*******************************************************
Function:
	I2c test Function.

Input:
	client:i2c client.

Output:
	Executive outcomes.0--success,non-0--fail.
*******************************************************/
static s8 gtp_i2c_test(struct i2c_client *client)
{
	u8 test[3] = { GTP_REG_CONFIG_DATA >> 8, GTP_REG_CONFIG_DATA & 0xff };
	u8 retry = 0;
	s8 ret = -1;

	GTP_DEBUG_FUNC();

	while (retry++ < 5) {
		ret = gtp_i2c_read(client, test, 3);
		if (ret > 0)
			return ret;
		GTP_ERROR("GTP i2c test failed time %d.", retry);
		msleep(10);
	}
	return ret;
}

/*******************************************************
Function:
	Request gpio Function.

Input:
	ts:private data.

Output:
	Executive outcomes.0--success,non-0--fail.
*******************************************************/
static s8 gtp_request_io_port(struct goodix_ts_data *ts)
{
	s32 ret = 0;

	ret = GTP_GPIO_REQUEST(g_int_pin, "GTP_INT_IRQ");
	if (ret < 0) {
		GTP_ERROR("Failed to request GPIO:%d, ERRNO:%d",
			  (s32) g_int_pin, ret);
		ret = -ENODEV;
	} else {
		GTP_GPIO_AS_INT(g_int_pin);
		ts->client->irq = GTP_INT_IRQ;
	}

	ret = GTP_GPIO_REQUEST(g_rst_pin, "g_rst_pin");
	if (ret < 0) {
		GTP_ERROR("Failed to request GPIO:%d, ERRNO:%d",
			  (s32) g_rst_pin, ret);
		ret = -ENODEV;
	}

	gtp_reset_guitar(ts->client, 20);

	if (ret < 0) {
		GTP_GPIO_FREE(g_rst_pin);
		GTP_GPIO_FREE(g_int_pin);
	}

	return ret;
}

/*******************************************************
Function:
	Request irq Function.

Input:
	ts:private data.

Output:
	Executive outcomes.0--success,non-0--fail.
*******************************************************/
static s8 gtp_request_irq(struct goodix_ts_data *ts)
{
	s32 ret = -1;
	const u8 irq_table[] = GTP_IRQ_TAB;

	GTP_DEBUG("INT trigger type:%x", ts->int_trigger_type);

	ret = request_irq(ts->client->irq,
			  goodix_ts_irq_handler,
			  irq_table[ts->int_trigger_type],
			  ts->client->name, ts);
	if (ret) {
		GTP_ERROR("Request IRQ failed!ERRNO:%d.", ret);
		GTP_GPIO_AS_INPUT(g_int_pin);
		GTP_GPIO_FREE(g_int_pin);

		hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
		ts->timer.function = goodix_ts_timer_handler;
		hrtimer_start(&ts->timer, ktime_set(1, 0), HRTIMER_MODE_REL);
		return -1;
	} else {
		gtp_irq_disable(ts);
		ts->use_irq = 1;
		return 0;
	}
}

/*******************************************************
Function:
	Request input device Function.

Input:
	ts:private data.

Output:
	Executive outcomes.0--success,non-0--fail.
*******************************************************/
static s8 gtp_request_input_dev(struct goodix_ts_data *ts)
{
	s8 ret = -1;
	s8 phys[32];
#if GTP_HAVE_TOUCH_KEY
	u8 index = 0;
#endif

	GTP_DEBUG_FUNC();

	ts->input_dev = input_allocate_device();
	if (ts->input_dev == NULL) {
		GTP_ERROR("Failed to allocate input device.");
		return -ENOMEM;
	}

#if GTP_ICS_SLOT_REPORT
	set_bit(INPUT_PROP_DIRECT, ts->input_dev->propbit);
	input_mt_init_slots(ts->input_dev, 255);
#else
	set_bit(INPUT_PROP_DIRECT, ts->input_dev->propbit);
	set_bit(BTN_TOUCH, ts->input_dev->keybit);
	set_bit(EV_ABS, ts->input_dev->evbit);
	set_bit(EV_SYN, ts->input_dev->evbit);
#endif

#if GTP_HAVE_TOUCH_KEY
	for (index = 0; index < GTP_MAX_KEY_NUM; index++) {
		input_set_capability(ts->input_dev, EV_KEY,
				     touch_key_array[index]);
	}
#endif

#if GTP_CHANGE_X2Y
	GTP_SWAP(ts->abs_x_max, ts->abs_y_max);
#endif

	input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X, 0, g_x_max_value,
			     0, 0);
	input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y, 0, g_y_max_value,
			     0, 0);
	input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
	input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
	input_set_abs_params(ts->input_dev, ABS_MT_TRACKING_ID, 0, 255, 0, 0);

	sprintf(phys, "input/ts");
	ts->input_dev->name = goodix_ts_name;
	ts->input_dev->phys = phys;
	ts->input_dev->id.bustype = BUS_I2C;
	ts->input_dev->id.vendor = 0xDEAD;
	ts->input_dev->id.product = 0xBEEF;
	ts->input_dev->id.version = 10427;

	ret = input_register_device(ts->input_dev);
	if (ret) {
		GTP_ERROR("Register %s input device failed",
			  ts->input_dev->name);
		return -ENODEV;
	}
#ifdef CONFIG_HAS_EARLYSUSPEND
	ts->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
	ts->early_suspend.suspend = goodix_ts_early_suspend;
	ts->early_suspend.resume = goodix_ts_late_resume;
	register_early_suspend(&ts->early_suspend);
#endif

	return 0;
}

/*******************************************************
Function:
	Goodix touchscreen probe function.

Input:
	client:	i2c device struct.
	id:device id.

Output:
	Executive outcomes. 0---succeed.
*******************************************************/
static int goodix_ts_probe(struct i2c_client *client,
			   const struct i2c_device_id *id)
{
	s32 ret = -1;
	struct goodix_ts_data *ts;
	struct device_node *np;
	u16 version_info;
	u32 val;

	GTP_DEBUG_FUNC();
	if (client == NULL) {
		printk(KERN_ERR "goodix client null.\n");
		return -ENODEV;
	}
	np = client->dev.of_node;
	if (np) {
		if (!of_property_read_u32(np, "gpio-irq-pin", &val))
			g_int_pin = val;
		if (!of_property_read_u32(np, "gpio-reset-pin", &val))
			g_rst_pin = val;
		if (!of_property_read_u32(np, "x-max-value", &val))
			g_x_max_value = val;
		if (!of_property_read_u32(np, "y-max-value", &val))
			g_y_max_value = val;

	}
	/* do NOT remove these output log */
	GTP_INFO("GTP Driver Version:%s", GTP_DRIVER_VERSION);
	GTP_INFO("GTP Driver build@%s,%s", __TIME__, __DATE__);
	GTP_INFO("GTP I2C Address:0x%02x", client->addr);

	i2c_connect_client = client;
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		GTP_ERROR("I2C check functionality failed.");
		return -ENODEV;
	}
	ts = kzalloc(sizeof(*ts), GFP_KERNEL);
	if (ts == NULL) {
		GTP_ERROR("Alloc GFP_KERNEL memory failed.");
		return -ENOMEM;
	}

	memset(ts, 0, sizeof(*ts));
	INIT_WORK(&ts->work, goodix_ts_work_func);
	ts->client = client;
	i2c_set_clientdata(client, ts);
	ts->gtp_rawdiff_mode = 0;

	ret = gtp_request_io_port(ts);
	if (ret < 0) {
		GTP_ERROR("GTP request IO port failed.");
		kfree(ts);
		return ret;
	}

	ret = gtp_i2c_test(client);
	if (ret < 0)
		GTP_ERROR("I2C communication ERROR!");
#if GTP_AUTO_UPDATE
	ret = gup_init_update_proc(ts);
	if (ret < 0)
		GTP_ERROR("Create update thread error.");
#endif

	ret = gtp_init_panel(ts);
	if (ret < 0)
		GTP_ERROR("GTP init panel failed.");

	ret = gtp_request_input_dev(ts);
	if (ret < 0)
		GTP_ERROR("GTP request input dev failed");

	ret = gtp_request_irq(ts);
	if (ret < 0)
		GTP_INFO("GTP works in polling mode.");
	else
		GTP_INFO("GTP works in interrupt mode.");

	ret = gtp_read_version(client, &version_info);
	if (ret < 0)
		GTP_ERROR("Read version failed.");
	spin_lock_init(&ts->irq_lock);

	gtp_irq_enable(ts);

#if GTP_CREATE_WR_NODE
	init_wr_node(client);
#endif

#if GTP_ESD_PROTECT
	INIT_DELAYED_WORK(&gtp_esd_check_work, gtp_esd_check_func);
	gtp_esd_check_workqueue = create_workqueue("gtp_esd_check");
	queue_delayed_work(gtp_esd_check_workqueue, &gtp_esd_check_work,
			   GTP_ESD_CHECK_CIRCLE);
#endif

	return 0;
}

/*******************************************************
Function:
	Goodix touchscreen driver release function.

Input:
	client:	i2c device struct.

Output:
	Executive outcomes. 0---succeed.
*******************************************************/
static int goodix_ts_remove(struct i2c_client *client)
{
	struct goodix_ts_data *ts = i2c_get_clientdata(client);

	GTP_DEBUG_FUNC();

#ifdef CONFIG_HAS_EARLYSUSPEND
	unregister_early_suspend(&ts->early_suspend);
#endif

#if GTP_CREATE_WR_NODE
	uninit_wr_node();
#endif

#if GTP_ESD_PROTECT
	destroy_workqueue(gtp_esd_check_workqueue);
#endif

	if (ts) {
		if (ts->use_irq) {
			GTP_GPIO_AS_INPUT(g_int_pin);
			GTP_GPIO_FREE(g_int_pin);
			free_irq(client->irq, ts);
		} else {
			hrtimer_cancel(&ts->timer);
		}
	}

	GTP_INFO("GTP driver is removing...");
	i2c_set_clientdata(client, NULL);
	input_unregister_device(ts->input_dev);
	kfree(ts);

	return 0;
}

/*******************************************************
Function:
	Early suspend function.

Input:
	h:early_suspend struct.

Output:
	None.
*******************************************************/
#ifdef CONFIG_HAS_EARLYSUSPEND
static void goodix_ts_early_suspend(struct early_suspend *h)
{
	struct goodix_ts_data *ts;
	s8 ret = -1;
	ts = container_of(h, struct goodix_ts_data, early_suspend);

	GTP_DEBUG_FUNC();

#if GTP_ESD_PROTECT
	ts->gtp_is_suspend = 1;
	cancel_delayed_work_sync(&gtp_esd_check_work);
#endif

	if (ts->use_irq)
		gtp_irq_disable(ts);
	else
		hrtimer_cancel(&ts->timer);
	ret = gtp_enter_sleep(ts);
	if (ret < 0)
		GTP_ERROR("GTP early suspend failed.");
}

/*******************************************************
Function:
	Late resume function.

Input:
	h:early_suspend struct.

Output:
	None.
*******************************************************/
static void goodix_ts_late_resume(struct early_suspend *h)
{
	struct goodix_ts_data *ts;
	s8 ret = -1;
	ts = container_of(h, struct goodix_ts_data, early_suspend);

	GTP_DEBUG_FUNC();

	ret = gtp_wakeup_sleep(ts);
	if (ret < 0)
		GTP_ERROR("GTP later resume failed.");

	if (ts->use_irq)
		gtp_irq_enable(ts);
	else
		hrtimer_start(&ts->timer, ktime_set(1, 0), HRTIMER_MODE_REL);

#if GTP_ESD_PROTECT
	ts->gtp_is_suspend = 0;
	queue_delayed_work(gtp_esd_check_workqueue, &gtp_esd_check_work,
			   GTP_ESD_CHECK_CIRCLE);
#endif
}
#endif

#if GTP_ESD_PROTECT
static void gtp_esd_check_func(struct work_struct *work)
{
	s32 i;
	s32 ret = -1;
	struct goodix_ts_data *ts = NULL;
	u8 test[3] = { GTP_REG_CONFIG_DATA >> 8, GTP_REG_CONFIG_DATA & 0xff };

	GTP_DEBUG_FUNC();

	ts = i2c_get_clientdata(i2c_connect_client);

	if (ts->gtp_is_suspend)
		return;

	for (i = 0; i < 3; i++) {
		ret = gtp_i2c_read(i2c_connect_client, test, 3);
		if (ret >= 0)
			break;
	}

	if (i >= 3)
		gtp_reset_guitar(ts->client, 50);

	if (!ts->gtp_is_suspend)
		queue_delayed_work(gtp_esd_check_workqueue, &gtp_esd_check_work,
				   GTP_ESD_CHECK_CIRCLE);

	return;
}
#endif

static const struct i2c_device_id goodix_ts_id[] = {
	{GTP_I2C_NAME, 0},
	{}
};

static struct i2c_driver goodix_ts_driver = {
	.probe = goodix_ts_probe,
	.remove = goodix_ts_remove,
#ifndef CONFIG_HAS_EARLYSUSPEND
	.suspend = goodix_ts_early_suspend,
	.resume = goodix_ts_late_resume,
#endif
	.id_table = goodix_ts_id,
	.driver = {
		   .name = GTP_I2C_NAME,
		   .owner = THIS_MODULE,
		   },
};

/*******************************************************
Function:
	Driver Install function.
Input:
  None.
Output:
	Executive Outcomes. 0---succeed.
********************************************************/
static int __devinit goodix_ts_init(void)
{
	s32 ret;

	GTP_DEBUG_FUNC();
	GTP_INFO("GTP driver install.");
	goodix_wq = create_singlethread_workqueue("goodix_wq");
	if (!goodix_wq) {
		GTP_ERROR("Creat workqueue failed.");
		return -ENOMEM;
	}
	ret = i2c_add_driver(&goodix_ts_driver);
	return ret;
}

/*******************************************************
Function:
	Driver uninstall function.
Input:
  None.
Output:
	Executive Outcomes. 0---succeed.
********************************************************/
static void __exit goodix_ts_exit(void)
{
	GTP_DEBUG_FUNC();
	GTP_INFO("GTP driver exited.");
	i2c_del_driver(&goodix_ts_driver);
	if (goodix_wq)
		destroy_workqueue(goodix_wq);
}

late_initcall(goodix_ts_init);
module_exit(goodix_ts_exit);

MODULE_DESCRIPTION("GTP Series Driver");
MODULE_LICENSE("GPL");