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Commit ffd0db97 authored by Dmitry Torokhov's avatar Dmitry Torokhov
Browse files

Input: add generic suspend and resume for input devices 



Automatically turn off leds and sound effects as part of suspend
process and restore led state, sounds and repeat rate at resume.

Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 181d683d

drivers/input/input.c

+63 −1
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
 */



#include <linux/init.h>

#include <linux/types.h>

#include <linux/input.h>

#include <linux/module.h>

#include <linux/random.h>
@@ -514,7 +515,7 @@ static void input_disconnect_device(struct input_dev *dev) 
	 * that there are no threads in the middle of input_open_device()

	 */

	mutex_lock(&dev->mutex);

	dev->going_away = 1;

	dev->going_away = true;

	mutex_unlock(&dev->mutex);



	spin_lock_irq(&dev->event_lock);
@@ -1259,10 +1260,71 @@ static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) 
	return 0;

}



#define INPUT_DO_TOGGLE(dev, type, bits, on)			\

	do {							\

		int i;						\

		if (!test_bit(EV_##type, dev->evbit))		\

			break;					\

		for (i = 0; i < type##_MAX; i++) {		\

			if (!test_bit(i, dev->bits##bit) ||	\

			    !test_bit(i, dev->bits))		\

				continue;			\

			dev->event(dev, EV_##type, i, on);	\

		}						\

	} while (0)



static void input_dev_reset(struct input_dev *dev, bool activate)

{

	if (!dev->event)

		return;



	INPUT_DO_TOGGLE(dev, LED, led, activate);

	INPUT_DO_TOGGLE(dev, SND, snd, activate);



	if (activate && test_bit(EV_REP, dev->evbit)) {

		dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);

		dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);

	}

}



#ifdef CONFIG_PM

static int input_dev_suspend(struct device *dev)

{

	struct input_dev *input_dev = to_input_dev(dev);



	mutex_lock(&input_dev->mutex);

	input_dev_reset(input_dev, false);

	mutex_unlock(&input_dev->mutex);



	return 0;

}



static int input_dev_resume(struct device *dev)

{

	struct input_dev *input_dev = to_input_dev(dev);



	mutex_lock(&input_dev->mutex);

	input_dev_reset(input_dev, true);

	mutex_unlock(&input_dev->mutex);



	return 0;

}



static const struct dev_pm_ops input_dev_pm_ops = {

	.suspend	= input_dev_suspend,

	.resume		= input_dev_resume,

	.poweroff	= input_dev_suspend,

	.restore	= input_dev_resume,

};

#endif /* CONFIG_PM */



static struct device_type input_dev_type = {

	.groups		= input_dev_attr_groups,

	.release	= input_dev_release,

	.uevent		= input_dev_uevent,

#ifdef CONFIG_PM

	.pm		= &input_dev_pm_ops,

#endif

};



static char *input_nodename(struct device *dev)

include/linux/input.h

+1 −1
Original line number Diff line number Diff line
@@ -1123,7 +1123,7 @@ struct input_dev { 
	struct mutex mutex;



	unsigned int users;

	int going_away;

	bool going_away;



	struct device dev;