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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
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8
drivers/leds/trigger/ledtrig-backlight.c
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@@ -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;
}