leds: core: Use set_brightness_work for the blocking op

This patch makes LED core capable of setting brightness for drivers
that implement brightness_set_blocking op. It removes from LED class
drivers responsibility for using work queues on their own.

In order to achieve this set_brightness_delayed callback is being
modified to directly call one of available ops for brightness setting.

led_set_brightness_async() function didn't set brightness in an
asynchronous way in all cases. It was mistakenly assuming that all
LED subsystem drivers used work queue in their brightness_set op,
whereas only half of them did that. Since it has no users now,
it is being removed.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>

diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index 3d16859..f57a96c 100644 (file)
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -83,6 +83,7 @@ static void set_brightness_delayed(struct work_struct *ws)
 {
        struct led_classdev *led_cdev =
                container_of(ws, struct led_classdev, set_brightness_work);
+       int ret = 0;
 
        if (led_cdev->flags & LED_BLINK_DISABLE) {
                led_cdev->delayed_set_value = LED_OFF;
@@ -90,7 +91,16 @@ static void set_brightness_delayed(struct work_struct *ws)
                led_cdev->flags &= ~LED_BLINK_DISABLE;
        }
 
-       led_set_brightness_async(led_cdev, led_cdev->delayed_set_value);
+       if (led_cdev->brightness_set)
+               led_cdev->brightness_set(led_cdev, led_cdev->delayed_set_value);
+       else if (led_cdev->brightness_set_blocking)
+               ret = led_cdev->brightness_set_blocking(led_cdev,
+                                               led_cdev->delayed_set_value);
+       else
+               ret = -ENOTSUPP;
+       if (ret < 0)
+               dev_err(led_cdev->dev,
+                       "Setting an LED's brightness failed (%d)\n", ret);
 }
 
 static void led_set_software_blink(struct led_classdev *led_cdev,

diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
index 8e252a2..683a605 100644 (file)
--- a/drivers/leds/leds.h
+++ b/drivers/leds/leds.h
@@ -16,16 +16,6 @@
 #include <linux/rwsem.h>
 #include <linux/leds.h>
 
-static inline void led_set_brightness_async(struct led_classdev *led_cdev,
-                                       enum led_brightness value)
-{
-       value = min(value, led_cdev->max_brightness);
-       led_cdev->brightness = value;
-
-       if (!(led_cdev->flags & LED_SUSPENDED))
-               led_cdev->brightness_set(led_cdev, value);
-}
-
 static inline int led_set_brightness_sync(struct led_classdev *led_cdev,
                                        enum led_brightness value)
 {

diff --git a/include/linux/leds.h b/include/linux/leds.h
index 403fa86..b35e0f5 100644 (file)
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -158,7 +158,7 @@ extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
  *
  * Set an LED's brightness, and, if necessary, cancel the
  * software blink timer that implements blinking when the
- * hardware doesn't.
+ * hardware doesn't. This function is guaranteed not to sleep.
  */
 extern void led_set_brightness(struct led_classdev *led_cdev,
                               enum led_brightness brightness);