Commit 34d27853 authored by Mark Brown's avatar Mark Brown Committed by Dmitry Torokhov
Browse files

Input: wm97xx-core - support use as a wakeup source 



The WM97xx touch screen controllers can be used to generate a wakeup
event when the system is suspended. Provide a new core API call
wm97xx_set_suspend_mode() allowing machine drivers to enable this. If no
suspend_mode is provided then the touch panel will be powered down when
the system is suspended.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent db7c10e7

drivers/input/touchscreen/wm97xx-core.c

+39 −0
Original line number Diff line number Diff line
@@ -261,6 +261,23 @@ void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, 
}

EXPORT_SYMBOL_GPL(wm97xx_config_gpio);



/*

 * Configure the WM97XX_PRP value to use while system is suspended.

 * If a value other than 0 is set then WM97xx pen detection will be

 * left enabled in the configured mode while the system is in suspend,

 * the device has users and suspend has not been disabled via the

 * wakeup sysfs entries.

 *

 * @wm:   WM97xx device to configure

 * @mode: WM97XX_PRP value to configure while suspended

 */

void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)

{

	wm->suspend_mode = mode;

	device_init_wakeup(&wm->input_dev->dev, mode != 0);

}

EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);



/*

 * Handle a pen down interrupt.

 */
@@ -689,10 +706,32 @@ static int wm97xx_remove(struct device *dev) 
static int wm97xx_suspend(struct device *dev, pm_message_t state)

{

	struct wm97xx *wm = dev_get_drvdata(dev);

	u16 reg;

	int suspend_mode;



	if (device_may_wakeup(&wm->input_dev->dev))

		suspend_mode = wm->suspend_mode;

	else

		suspend_mode = 0;



	if (wm->input_dev->users)

		cancel_delayed_work_sync(&wm->ts_reader);



	/* Power down the digitiser (bypassing the cache for resume) */

	reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);

	reg &= ~WM97XX_PRP_DET_DIG;

	if (wm->input_dev->users)

		reg |= suspend_mode;

	wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);



	/* WM9713 has an additional power bit - turn it off if there

	 * are no users or if suspend mode is zero. */

	if (wm->id == WM9713_ID2 &&

	    (!wm->input_dev->users || !suspend_mode)) {

		reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;

		wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);

	}



	return 0;

}

include/linux/wm97xx.h

+3 −0
Original line number Diff line number Diff line
@@ -282,6 +282,7 @@ struct wm97xx { 
	unsigned pen_is_down:1;		/* Pen is down */

	unsigned aux_waiting:1;		/* aux measurement waiting */

	unsigned pen_probably_down:1;	/* used in polling mode */

	u16 suspend_mode;               /* PRP in suspend mode */

};



/*
@@ -297,6 +298,8 @@ void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, 
				     enum wm97xx_gpio_sticky sticky,

				     enum wm97xx_gpio_wake wake);



void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode);



/* codec AC97 IO access */

int wm97xx_reg_read(struct wm97xx *wm, u16 reg);

void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val);

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