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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: Marco Trevisan (Treviño) <mail@3v1n0.net>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
This commit is contained in:
Marco Trevisan (Treviño) 2016-05-24 00:39:51 +02:00 committed by Darren Hart
parent a29ccf6ff3
commit afcedebc6a
1 changed files with 40 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/platform/x86/thinkpad_acpi.c
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@ -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,
};