led_set_brightness_sync function was visible only internally to the
LED subsystem. It is now being made publicly available since it has
become apparent that this is a caller who should decide whether
brightness is to be set in a synchronous or an asynchronous way.
The function is modified to use brightness_set_blocking or
brightness_set op, depending on which of them is implemented, in case
brightness_set_sync op wasn't been provided.
Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Cc: Andrew Lunn <andrew@xxxxxxx>
Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: Stas Sergeev <stsp@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/leds/led-core.c | 25 +++++++++++++++++++++++++
drivers/leds/leds.h | 13 -------------
include/linux/leds.h | 15 +++++++++++++++
3 files changed, 40 insertions(+), 13 deletions(-)
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index 549de7e..3f3b71d 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -141,6 +141,31 @@ void led_set_brightness(struct led_classdev *led_cdev,
}
EXPORT_SYMBOL(led_set_brightness);
+int led_set_brightness_sync(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ int ret = 0;
+
+ led_cdev->brightness = min(value, led_cdev->max_brightness);
+
+ if (led_cdev->flags & LED_SUSPENDED)
+ return 0;
+
+ if (led_cdev->brightness_set_sync)
+ ret = led_cdev->brightness_set_sync(led_cdev,
+ led_cdev->brightness);
+ else if (led_cdev->brightness_set_blocking)
+ led_cdev->brightness_set_blocking(led_cdev,
+ led_cdev->brightness);
+ else if (led_cdev->brightness_set)
+ led_cdev->brightness_set(led_cdev, led_cdev->brightness);
+ else
+ ret = -EINVAL;
+
+ return ret;
+}
+EXPORT_SYMBOL(led_set_brightness_sync);
+
int led_update_brightness(struct led_classdev *led_cdev)
{
int ret = 0;
diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
index bc89d7a..1c026c9 100644
--- a/drivers/leds/leds.h
+++ b/drivers/leds/leds.h
@@ -26,19 +26,6 @@ static inline void led_set_brightness_async(struct led_classdev *led_cdev,
led_cdev->brightness_set(led_cdev, value);
}
-static inline int led_set_brightness_sync(struct led_classdev *led_cdev,
- enum led_brightness value)
-{
- int ret = 0;
-
- led_cdev->brightness = min(value, led_cdev->max_brightness);
-
- if (!(led_cdev->flags & LED_SUSPENDED))
- ret = led_cdev->brightness_set_sync(led_cdev,
- led_cdev->brightness);
- return ret;
-}
-
static inline int led_get_brightness(struct led_classdev *led_cdev)
{
return led_cdev->brightness;
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 85fad6b..2377e0f 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -166,6 +166,21 @@ extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
*/
extern void led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness brightness);
+
+/**
+ * led_set_brightness_sync - set LED brightness synchronously
+ * @led_cdev: the LED to set
+ * @brightness: the brightness to set it to
+ *
+ * Set an LED's brightness immediately. This function will block
+ * the caller for the time required for accessing device register,
+ * and it can sleep.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+extern int led_set_brightness_sync(struct led_classdev *led_cdev,
+ enum led_brightness value);
+
/**
* led_update_brightness - update LED brightness
* @led_cdev: the LED to query
--
1.7.9.5
--
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