Allow initialization of delays used in timer trigger from Device
Tree property.
This is especially useful for embedded systems where the trigger might
be used early, before bringing up user-space.
Signed-off-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
---
drivers/leds/trigger/ledtrig-timer.c | 34 ++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/leds/trigger/ledtrig-timer.c b/drivers/leds/trigger/ledtrig-timer.c
index 7c14983781ee..3c253241cfa6 100644
--- a/drivers/leds/trigger/ledtrig-timer.c
+++ b/drivers/leds/trigger/ledtrig-timer.c
@@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/device.h>
#include <linux/ctype.h>
+#include <linux/slab.h>
#include <linux/leds.h>
static ssize_t led_delay_on_show(struct device *dev,
@@ -77,8 +78,41 @@ static struct attribute *timer_trig_attrs[] = {
};
ATTRIBUTE_GROUPS(timer_trig);
+static void pattern_init(struct led_classdev *led_cdev)
+{
+ u32 *pattern;
+ unsigned int size = 0;
+
+ pattern = led_classdev_get_default_pattern(led_cdev, &size);
+ if (!pattern)
+ return;
+
+ if (size != 2) {
+ dev_warn(led_cdev->dev,
+ "Expected 2 but got %u values for delays pattern\n",
+ size);
+ goto out;
+ }
+
+ led_cdev->blink_delay_on = pattern[0];
+ led_cdev->blink_delay_off = pattern[1];
+ /* led_blink_set() called by caller */
+
+out:
+ kfree(pattern);
+}
+
static int timer_trig_activate(struct led_classdev *led_cdev)
{
+ if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
+ pattern_init(led_cdev);
+ /*
+ * Mark as initialized even on pattern_init() error because
+ * any consecutive call to it would produce the same error.
+ */
+ led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
+ }
+
led_blink_set(led_cdev, &led_cdev->blink_delay_on,
&led_cdev->blink_delay_off);
--
2.17.1
