This patch adds LED_BRIGHTNESS_BLOCKING flag to the LED core to make it
capable of discerning between drivers that implement brightness_set op
in the old manner, i.e. the ones which use work queue internally, and
drivers that implement brightness_set op in the new manner, i.e. they
are aware that brightness_set op will be called from a work queue task
by the LED core.
In the new approach all drivers that implement brightness_set op should
also set LED_BRIGHTNESS_BLOCKING flag.
Signed-off-by: Jacek Anaszewski <j.anaszew...@samsung.com>
Cc: Bryan Wu <coolo...@gmail.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-class.c | 3 +++
include/linux/leds.h | 1 +
2 files changed, 4 insertions(+)
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index ca51d58..2875e6a 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -279,6 +279,9 @@ int led_classdev_register(struct device *parent, struct
led_classdev *led_cdev)
if (!led_cdev->max_brightness)
led_cdev->max_brightness = LED_FULL;
+ WARN_ON((led_cdev->flags & LED_BRIGHTNESS_BLOCKING) &&
+ !led_cdev->brightness_set);
+
led_cdev->flags |= SET_BRIGHTNESS_ASYNC;
led_update_brightness(led_cdev);
diff --git a/include/linux/leds.h b/include/linux/leds.h
index c32f1b8..ac9efe1 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -48,6 +48,7 @@ struct led_classdev {
#define SET_BRIGHTNESS_ASYNC (1 << 21)
#define SET_BRIGHTNESS_SYNC (1 << 22)
#define LED_DEV_CAP_FLASH (1 << 23)
+#define LED_BRIGHTNESS_BLOCKING (1 << 24)
/* Set LED brightness level */
/* Must not sleep, use a workqueue if needed */
--
1.7.9.5
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