This patch adds led_set_brightness_nosleep function. It guarantees setting
LED brightness in a non-blocking way.
Signed-off-by: Jacek Anaszewski <j.anaszew...@samsung.com>
Cc: Andrew Lunn <and...@lunn.ch>
Cc: Sakari Ailus <sakari.ai...@linux.intel.com>
Cc: Pavel Machek <pa...@ucw.cz>
Cc: Stas Sergeev <s...@users.sourceforge.net>
---
drivers/leds/led-core.c | 21 +++++++++++++++++++++
drivers/leds/leds.h | 4 ++++
2 files changed, 25 insertions(+)
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index b69271f..0200407 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -114,6 +114,27 @@ void led_stop_software_blink(struct led_classdev *led_cdev)
}
EXPORT_SYMBOL_GPL(led_stop_software_blink);
+void led_set_brightness_nosleep(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ int ret;
+
+ /*
+ * Drivers that implement brightness_set op are guaranteed
+ * not to sleep while setting brightness.
+ */
+ if (led_cdev->brightness_set) {
+ ret = led_set_brightness_sync(led_cdev, value);
+ if (ret < 0)
+ dev_err(led_cdev->dev,
+ "cannot set led brightness %d\n", ret);
+ return;
+ }
+
+ led_set_brightness_async(led_cdev, value);
+}
+EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
+
void led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
index ca38f6a..cd251be 100644
--- a/drivers/leds/leds.h
+++ b/drivers/leds/leds.h
@@ -2,8 +2,10 @@
* LED Core
*
* Copyright 2005 Openedhand Ltd.
+ * Copyright 2014, 2015 Samsung Electronics Co., Ltd.
*
* Author: Richard Purdie <rpur...@openedhand.com>
+ * Author: Jacek Anaszewski <j.anaszew...@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -28,6 +30,8 @@ static inline int led_get_brightness(struct led_classdev
*led_cdev)
return led_cdev->brightness;
}
+void led_set_brightness_nosleep(struct led_classdev *led_cdev,
+ enum led_brightness value);
void led_stop_software_blink(struct led_classdev *led_cdev);
extern struct rw_semaphore leds_list_lock;
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
