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Commit afcedebc authored by Marco Trevisan (Treviño)'s avatar Marco Trevisan (Treviño) Committed by Darren Hart
Browse files

thinkpad_acpi: save kbdlight state on suspend and restore it on resume 



Override default LED class suspend/resume handles, by keeping track of
the brightness level before suspending so that it can be automatically
restored on resume by calling default resume handler.

Signed-off-by: default avatarMarco Trevisan (Treviño) <mail@3v1n0.net>
Acked-by: default avatarHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: default avatarDarren Hart <dvhart@linux.intel.com>
parent a29ccf6f

drivers/platform/x86/thinkpad_acpi.c

+40 −3
Original line number Diff line number Diff line
@@ -5001,6 +5001,8 @@ static int kbdlight_set_level(int level) 
	return 0;

}



static int kbdlight_set_level_and_update(int level);



static int kbdlight_get_level(void)

{

	int status = 0;
@@ -5068,7 +5070,7 @@ static void kbdlight_set_worker(struct work_struct *work) 
			container_of(work, struct tpacpi_led_classdev, work);



	if (likely(tpacpi_lifecycle == TPACPI_LIFE_RUNNING))

		kbdlight_set_level(data->new_state);

		kbdlight_set_level_and_update(data->new_state);

}



static void kbdlight_sysfs_set(struct led_classdev *led_cdev,
@@ -5099,7 +5101,6 @@ static struct tpacpi_led_classdev tpacpi_led_kbdlight = { 
		.max_brightness	= 2,

		.brightness_set	= &kbdlight_sysfs_set,

		.brightness_get	= &kbdlight_sysfs_get,

		.flags		= LED_CORE_SUSPENDRESUME,

	}

};
@@ -5137,6 +5138,20 @@ static void kbdlight_exit(void) 
	flush_workqueue(tpacpi_wq);

}



static int kbdlight_set_level_and_update(int level)

{

	int ret;

	struct led_classdev *led_cdev;



	ret = kbdlight_set_level(level);

	led_cdev = &tpacpi_led_kbdlight.led_classdev;



	if (ret == 0 && !(led_cdev->flags & LED_SUSPENDED))

		led_cdev->brightness = level;



	return ret;

}



static int kbdlight_read(struct seq_file *m)

{

	int level;
@@ -5177,13 +5192,35 @@ static int kbdlight_write(char *buf) 
	if (level == -1)

		return -EINVAL;



	return kbdlight_set_level(level);

	return kbdlight_set_level_and_update(level);

}



static void kbdlight_suspend(void)

{

	struct led_classdev *led_cdev;



	if (!tp_features.kbdlight)

		return;



	led_cdev = &tpacpi_led_kbdlight.led_classdev;

	led_update_brightness(led_cdev);

	led_classdev_suspend(led_cdev);

}



static void kbdlight_resume(void)

{

	if (!tp_features.kbdlight)

		return;



	led_classdev_resume(&tpacpi_led_kbdlight.led_classdev);

}



static struct ibm_struct kbdlight_driver_data = {

	.name = "kbdlight",

	.read = kbdlight_read,

	.write = kbdlight_write,

	.suspend = kbdlight_suspend,

	.resume = kbdlight_resume,

	.exit = kbdlight_exit,

};