led_update_brightness helper function used to be exploited only locally
in the led-class.c module, where its result was being passed to the
brightness_show sysfs callback. With the introduction of v4l2-flash
subdevice the same functionality became required for reading current
brightness from a LED device. This patch adds checking of return value
of the brightness_get callback and moves the led_update_brightness()
function to the LED subsystem public API.
Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Bryan Wu <cooloney@xxxxxxxxx>
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
---
drivers/leds/led-class.c | 6 ------
drivers/leds/led-core.c | 15 +++++++++++++++
include/linux/leds.h | 10 ++++++++++
3 files changed, 25 insertions(+), 6 deletions(-)
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index ea04891..da79bbb 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -23,12 +23,6 @@
static struct class *leds_class;
-static void led_update_brightness(struct led_classdev *led_cdev)
-{
- if (led_cdev->brightness_get)
- led_cdev->brightness = led_cdev->brightness_get(led_cdev);
-}
-
static ssize_t brightness_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index 4d7cb31..0ac06ed 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -127,6 +127,21 @@ void led_set_brightness(struct led_classdev *led_cdev,
}
EXPORT_SYMBOL(led_set_brightness);
+int led_update_brightness(struct led_classdev *led_cdev)
+{
+ int ret = 0;
+
+ if (led_cdev->brightness_get) {
+ ret = led_cdev->brightness_get(led_cdev);
+ if (ret >= 0) {
+ led_cdev->brightness = ret;
+ return 0;
+ }
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(led_update_brightness);
/* Caller must ensure led_cdev->led_lock held */
void led_sysfs_lock(struct led_classdev *led_cdev)
{
diff --git a/include/linux/leds.h b/include/linux/leds.h
index da7c6b5..e9b025d 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -146,6 +146,16 @@ 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_update_brightness - update LED brightness
+ * @led_cdev: the LED to query
+ *
+ * Get an LED's current brightness and update led_cdev->brightness
+ * member with the obtained value.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+extern int led_update_brightness(struct led_classdev *led_cdev);
+
* led_sysfs_lock - lock LED sysfs interface
* @led_cdev: the LED to set
*
--
1.7.9.5
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