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Commit 4e065928 authored by Shantanu Jain's avatar Shantanu Jain
Browse files

input: it7258_ts_i2c: add low power mode support in suspend state 



Add low power idle mode support in suspend state for ITE tech
touchscreen driver.
Also, execute the touch to wake feature code only when device moves
from idle state to active state.

Change-Id: Ia989d8130bbded4ae5acab0b9c3122998acb2056
Signed-off-by: default avatarShantanu Jain <shjain@codeaurora.org>
parent e37c360d

drivers/input/touchscreen/it7258_ts_i2c.c

+32 −43
Original line number Diff line number Diff line
@@ -73,10 +73,13 @@ 
#define VERSION_LENGTH			10

/* subcommand is zero, next byte is power mode */

#define CMD_PWR_CTL			0x04

/* active mode */

#define PWR_CTL_ACTIVE_MODE		0x00

/* idle mode */

#define PWR_CTL_LOW_POWER_MODE		0x01

/* sleep mode */

#define PWR_CTL_SLEEP_MODE		0x02

#define WAIT_CHANGE_MODE		20

/* command is not documented in the datasheet v1.0.0.7 */

#define CMD_UNKNOWN_7			0x07

#define CMD_FIRMWARE_REINIT_C		0x0C
@@ -582,18 +585,18 @@ out: 
	return ret;

}



static int IT7260_ts_chipLowPowerMode(bool low)

static int IT7260_ts_chipLowPowerMode(const u8 sleep_type)

{

	static const uint8_t cmd_sleep[] = {CMD_PWR_CTL,

					0x00, PWR_CTL_SLEEP_MODE};

	const uint8_t cmd_sleep[] = {CMD_PWR_CTL, 0x00, sleep_type};

	uint8_t dummy;



	if (low)

	if (sleep_type)

		IT7260_i2cWriteNoReadyCheck(BUF_COMMAND, cmd_sleep,

					sizeof(cmd_sleep));

	else

		IT7260_i2cReadNoReadyCheck(BUF_QUERY, &dummy, sizeof(dummy));



	msleep(WAIT_CHANGE_MODE);

	return 0;

}
@@ -863,10 +866,10 @@ static ssize_t sysfs_sleep_store(struct device *dev, 
			go_to_sleep ? "sleep" : "wake");

	else if (go_to_sleep) {

		disable_irq(gl_ts->client->irq);

		IT7260_ts_chipLowPowerMode(true);

		IT7260_ts_chipLowPowerMode(PWR_CTL_SLEEP_MODE);

		dev_dbg(dev, "touch is going to sleep...\n");

	} else {

		IT7260_ts_chipLowPowerMode(false);

		IT7260_ts_chipLowPowerMode(PWR_CTL_ACTIVE_MODE);

		enable_irq(gl_ts->client->irq);

		dev_dbg(dev, "touch is going to wake!\n");

	}
@@ -1019,24 +1022,6 @@ static irqreturn_t IT7260_ts_threaded_handler(int irq, void *devid) 
	u16 x, y;

	bool palm_detected;



	/*

	 * This code adds the touch-to-wake functionality to the ITE tech

	 * driver. When the device is in suspend, driver sends the

	 * KEY_WAKEUP event to wake the device. The pm_stay_awake() call

	 * tells the pm core to stay awake until the CPU cores up already. The

	 * schedule_work() call schedule a work that tells the pm core to relax

	 * once the CPU cores are up.

	 */

	if (gl_ts->device_needs_wakeup) {

		pm_stay_awake(&gl_ts->client->dev);

		gl_ts->device_needs_wakeup = false;

		input_report_key(input_dev, KEY_WAKEUP, 1);

		input_sync(input_dev);

		input_report_key(input_dev, KEY_WAKEUP, 0);

		input_sync(input_dev);

		schedule_work(&gl_ts->work_pm_relax);

	}



	/* verify there is point data to read & it is readable and valid */

	IT7260_i2cReadNoReadyCheck(BUF_QUERY, &dev_status, sizeof(dev_status));

	if (!((dev_status & PT_INFO_BITS) & PT_INFO_YES))
@@ -1047,13 +1032,30 @@ static irqreturn_t IT7260_ts_threaded_handler(int irq, void *devid) 
			"failed to read point data buffer\n");

		return IRQ_HANDLED;

	}



	/* Check if controller moves from idle to active state */

	if ((point_data.flags & PD_FLAGS_DATA_TYPE_BITS) !=

					PD_FLAGS_DATA_TYPE_TOUCH) {

		dev_err(&gl_ts->client->dev,

			"dropping non-point data of type 0x%02X\n",

							point_data.flags);

		/*

		 * This code adds the touch-to-wake functionality to the ITE

		 * tech driver. When user puts a finger on touch controller in

		 * idle state, the controller moves to active state and driver

		 * sends the KEY_WAKEUP event to wake the device. The

		 * pm_stay_awake() call tells the pm core to stay awake until

		 * the CPU cores are up already. The schedule_work() call

		 * schedule a work that tells the pm core to relax once the CPU

		 * cores are up.

		 */

		if (gl_ts->device_needs_wakeup) {

			pm_stay_awake(&gl_ts->client->dev);

			input_report_key(input_dev, KEY_WAKEUP, 1);

			input_sync(input_dev);

			input_report_key(input_dev, KEY_WAKEUP, 0);

			input_sync(input_dev);

			schedule_work(&gl_ts->work_pm_relax);

			return IRQ_HANDLED;

		}

	}



	palm_detected = point_data.palm & PD_PALM_FLAG_BIT;

	if (palm_detected && gl_ts->pdata->palm_detect_en) {
@@ -1570,11 +1572,6 @@ static int fb_notifier_callback(struct notifier_block *self, 
#ifdef CONFIG_PM

static int IT7260_ts_resume(struct device *dev)

{

	if (!gl_ts->suspended) {

		dev_info(dev, "Already in resume state\n");

		return 0;

	}



	if (device_may_wakeup(dev)) {

		if (gl_ts->device_needs_wakeup) {

			gl_ts->device_needs_wakeup = false;
@@ -1583,9 +1580,6 @@ static int IT7260_ts_resume(struct device *dev) 
		return 0;

	}



	/* put the device in active power mode */

	IT7260_ts_chipLowPowerMode(false);



	enable_irq(gl_ts->client->irq);

	gl_ts->suspended = false;

	return 0;
@@ -1598,10 +1592,8 @@ static int IT7260_ts_suspend(struct device *dev) 
		return -EBUSY;

	}



	if (gl_ts->suspended) {

		dev_info(dev, "Already in suspend state\n");

		return 0;

	}

	/* put the device in low power idle mode */

	IT7260_ts_chipLowPowerMode(PWR_CTL_LOW_POWER_MODE);



	if (device_may_wakeup(dev)) {

		if (!gl_ts->device_needs_wakeup) {
@@ -1613,9 +1605,6 @@ static int IT7260_ts_suspend(struct device *dev) 


	disable_irq(gl_ts->client->irq);



	/* put the device in low power mode */

	IT7260_ts_chipLowPowerMode(true);



	IT7260_ts_release_all();

	gl_ts->suspended = true;