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leds: core: Add led_set_brightness_nosleep{nopm} functions

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This patch adds led_set_brightness_nosleep() and led_set_brightness_nopm()
functions, that guarantee setting LED brightness in a non-blocking way.
The latter is used from pm_ops context and doesn't modify the brightness
cached in the struct led_classdev. Its execution always ends up with
a call to brightness setting op - either directly or through
a set_brightness_work, regardless of LED_SUSPENDED flag state.

The patch also replaces led_set_brightness_async() with
led_set_brightness_nosleep() in all places where the most vital was setting
brightness in a non sleeping way but not necessarily asynchronously, which
is not needed for non-blocking drivers.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
This commit is contained in:
Jacek Anaszewski 2015-10-07 11:10:41 +02:00
parent 437a4240f2
commit 81fe8e5b73
9 changed files with 55 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/leds/led-class.c
View File

@ -109,7 +109,7 @@ static const struct attribute_group *led_groups[] = {
void led_classdev_suspend(struct led_classdev *led_cdev)
{
led_cdev->flags |= LED_SUSPENDED;
led_cdev->brightness_set(led_cdev, 0);
led_set_brightness_nopm(led_cdev, 0);
}
EXPORT_SYMBOL_GPL(led_classdev_suspend);
@ -119,7 +119,7 @@ EXPORT_SYMBOL_GPL(led_classdev_suspend);
*/
void led_classdev_resume(struct led_classdev *led_cdev)
{
led_cdev->brightness_set(led_cdev, led_cdev->brightness);
led_set_brightness_nopm(led_cdev, led_cdev->brightness);
if (led_cdev->flash_resume)
led_cdev->flash_resume(led_cdev);

38
drivers/leds/led-core.c
View File

@ -32,7 +32,7 @@ static void led_timer_function(unsigned long data)
unsigned long delay;
if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
led_set_brightness_async(led_cdev, LED_OFF);
led_set_brightness_nosleep(led_cdev, LED_OFF);
return;
}
@ -60,7 +60,7 @@ static void led_timer_function(unsigned long data)
delay = led_cdev->blink_delay_off;
}
led_set_brightness_async(led_cdev, brightness);
led_set_brightness_nosleep(led_cdev, brightness);
/* Return in next iteration if led is in one-shot mode and we are in
* the final blink state so that the led is toggled each delay_on +
@ -110,13 +110,14 @@ static void led_set_software_blink(struct led_classdev *led_cdev,
/* never on - just set to off */
if (!delay_on) {
led_set_brightness_async(led_cdev, LED_OFF);
led_set_brightness_nosleep(led_cdev, LED_OFF);
return;
}
/* never off - just set to brightness */
if (!delay_off) {
led_set_brightness_async(led_cdev, led_cdev->blink_brightness);
led_set_brightness_nosleep(led_cdev,
led_cdev->blink_brightness);
return;
}
@ -217,7 +218,7 @@ void led_set_brightness(struct led_classdev *led_cdev,
}
if (led_cdev->flags & SET_BRIGHTNESS_ASYNC) {
led_set_brightness_async(led_cdev, brightness);
led_set_brightness_nosleep(led_cdev, brightness);
return;
} else if (led_cdev->flags & SET_BRIGHTNESS_SYNC)
ret = led_set_brightness_sync(led_cdev, brightness);
@ -230,6 +231,33 @@ void led_set_brightness(struct led_classdev *led_cdev,
}
EXPORT_SYMBOL_GPL(led_set_brightness);
void led_set_brightness_nopm(struct led_classdev *led_cdev,
enum led_brightness value)
{
/* Use brightness_set op if available, it is guaranteed not to sleep */
if (led_cdev->brightness_set) {
led_cdev->brightness_set(led_cdev, value);
return;
}
/* If brightness setting can sleep, delegate it to a work queue task */
led_cdev->delayed_set_value = value;
schedule_work(&led_cdev->set_brightness_work);
}
EXPORT_SYMBOL_GPL(led_set_brightness_nopm);
void led_set_brightness_nosleep(struct led_classdev *led_cdev,
enum led_brightness value)
{
led_cdev->brightness = min(value, led_cdev->max_brightness);
if (led_cdev->flags & LED_SUSPENDED)
return;
led_set_brightness_nopm(led_cdev, led_cdev->brightness);
}
EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
int led_update_brightness(struct led_classdev *led_cdev)
{
int ret = 0;

4
drivers/leds/leds.h
View File

@ -46,6 +46,10 @@ static inline int led_get_brightness(struct led_classdev *led_cdev)
void led_init_core(struct led_classdev *led_cdev);
void led_stop_software_blink(struct led_classdev *led_cdev);
void led_set_brightness_nopm(struct led_classdev *led_cdev,
enum led_brightness value);
void led_set_brightness_nosleep(struct led_classdev *led_cdev,
enum led_brightness value);
extern struct rw_semaphore leds_list_lock;
extern struct list_head leds_list;

8
drivers/leds/trigger/ledtrig-backlight.c
View File

@ -51,9 +51,9 @@ static int fb_notifier_callback(struct notifier_block *p,
if ((n->old_status == UNBLANK) ^ n->invert) {
n->brightness = led->brightness;
led_set_brightness_async(led, LED_OFF);
led_set_brightness_nosleep(led, LED_OFF);
} else {
led_set_brightness_async(led, n->brightness);
led_set_brightness_nosleep(led, n->brightness);
}
n->old_status = new_status;
@ -89,9 +89,9 @@ static ssize_t bl_trig_invert_store(struct device *dev,
/* After inverting, we need to update the LED. */
if ((n->old_status == BLANK) ^ n->invert)
led_set_brightness_async(led, LED_OFF);
led_set_brightness_nosleep(led, LED_OFF);
else
led_set_brightness_async(led, n->brightness);
led_set_brightness_nosleep(led, n->brightness);
return num;
}

2
drivers/leds/trigger/ledtrig-default-on.c
View File

@ -19,7 +19,7 @@
static void defon_trig_activate(struct led_classdev *led_cdev)
{
led_set_brightness_async(led_cdev, led_cdev->max_brightness);
led_set_brightness_nosleep(led_cdev, led_cdev->max_brightness);
}
static struct led_trigger defon_led_trigger = {

6
drivers/leds/trigger/ledtrig-gpio.c
View File

@ -54,12 +54,12 @@ static void gpio_trig_work(struct work_struct *work)
if (tmp) {
if (gpio_data->desired_brightness)
led_set_brightness_async(gpio_data->led,
led_set_brightness_nosleep(gpio_data->led,
gpio_data->desired_brightness);
else
led_set_brightness_async(gpio_data->led, LED_FULL);
led_set_brightness_nosleep(gpio_data->led, LED_FULL);
} else {
led_set_brightness_async(gpio_data->led, LED_OFF);
led_set_brightness_nosleep(gpio_data->led, LED_OFF);
}
}

4
drivers/leds/trigger/ledtrig-heartbeat.c
View File

@ -38,7 +38,7 @@ static void led_heartbeat_function(unsigned long data)
unsigned long delay = 0;
if (unlikely(panic_heartbeats)) {
led_set_brightness(led_cdev, LED_OFF);
led_set_brightness_nosleep(led_cdev, LED_OFF);
return;
}
@ -81,7 +81,7 @@ static void led_heartbeat_function(unsigned long data)
break;
}
led_set_brightness_async(led_cdev, brightness);
led_set_brightness_nosleep(led_cdev, brightness);
mod_timer(&heartbeat_data->timer, jiffies + delay);
}

4
drivers/leds/trigger/ledtrig-oneshot.c
View File

@ -63,9 +63,9 @@ static ssize_t led_invert_store(struct device *dev,
oneshot_data->invert = !!state;
if (oneshot_data->invert)
led_set_brightness_async(led_cdev, LED_FULL);
led_set_brightness_nosleep(led_cdev, LED_FULL);
else
led_set_brightness_async(led_cdev, LED_OFF);
led_set_brightness_nosleep(led_cdev, LED_OFF);
return size;
}

8
drivers/leds/trigger/ledtrig-transient.c
View File

@ -41,7 +41,7 @@ static void transient_timer_function(unsigned long data)
struct transient_trig_data *transient_data = led_cdev->trigger_data;
transient_data->activate = 0;
led_set_brightness_async(led_cdev, transient_data->restore_state);
led_set_brightness_nosleep(led_cdev, transient_data->restore_state);
}
static ssize_t transient_activate_show(struct device *dev,
@ -72,7 +72,7 @@ static ssize_t transient_activate_store(struct device *dev,
if (state == 0 && transient_data->activate == 1) {
del_timer(&transient_data->timer);
transient_data->activate = state;
led_set_brightness_async(led_cdev,
led_set_brightness_nosleep(led_cdev,
transient_data->restore_state);
return size;
}
@ -81,7 +81,7 @@ static ssize_t transient_activate_store(struct device *dev,
if (state == 1 && transient_data->activate == 0 &&
transient_data->duration != 0) {
transient_data->activate = state;
led_set_brightness_async(led_cdev, transient_data->state);
led_set_brightness_nosleep(led_cdev, transient_data->state);
transient_data->restore_state =
(transient_data->state == LED_FULL) ? LED_OFF : LED_FULL;
mod_timer(&transient_data->timer,
@ -204,7 +204,7 @@ static void transient_trig_deactivate(struct led_classdev *led_cdev)
if (led_cdev->activated) {
del_timer_sync(&transient_data->timer);
led_set_brightness_async(led_cdev,
led_set_brightness_nosleep(led_cdev,
transient_data->restore_state);
device_remove_file(led_cdev->dev, &dev_attr_activate);
device_remove_file(led_cdev->dev, &dev_attr_duration);