Add basic support for RGB triggers. Triggers with flag LED_TRIG_CAP_RGB
set are available to RGB LED devices only.
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
v2:
- renamed check to led_trigger_is_supported()
- removed unrelated other change
---
drivers/leds/led-triggers.c | 11 +++++++++++
include/linux/leds.h | 3 +++
2 files changed, 14 insertions(+)
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 2181581..f01d6c0 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -30,6 +30,13 @@ static LIST_HEAD(trigger_list);
/* Used by LED Class */
+static inline bool led_trigger_is_supported(struct led_trigger *trig,
+ struct led_classdev *led_cdev)
+{
+ return !(trig->flags & LED_TRIG_CAP_RGB) ||
+ led_cdev->flags & LED_DEV_CAP_RGB;
+}
+
ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
@@ -52,6 +59,8 @@ ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
down_read(&triggers_list_lock);
list_for_each_entry(trig, &trigger_list, next_trig) {
if (sysfs_streq(buf, trig->name)) {
+ if (!led_trigger_is_supported(trig, led_cdev))
+ break;
down_write(&led_cdev->trigger_lock);
led_trigger_set(led_cdev, trig);
up_write(&led_cdev->trigger_lock);
@@ -84,6 +93,8 @@ ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
len += sprintf(buf+len, "none ");
list_for_each_entry(trig, &trigger_list, next_trig) {
+ if (!led_trigger_is_supported(trig, led_cdev))
+ continue;
if (led_cdev->trigger && !strcmp(led_cdev->trigger->name,
trig->name))
len += sprintf(buf+len, "[%s] ", trig->name);
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 58e22e6..07eb074 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -248,6 +248,9 @@ enum led_brightness led_hsv_to_rgb(enum led_brightness hsv);
struct led_trigger {
/* Trigger Properties */
const char *name;
+ u8 flags;
+#define LED_TRIG_CAP_RGB BIT(0)
+
void (*activate)(struct led_classdev *led_cdev);
void (*deactivate)(struct led_classdev *led_cdev);
--
2.7.3
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