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authorKrzysztof Kozlowski <krzk@kernel.org>2019-01-09 17:44:49 +0300
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2019-01-17 00:09:25 +0300
commit0f85e8498a482cbfdab91fb2d1b81c6c8c1cfd15 (patch)
tree47594606adbf3838f6d213b8b89e66663a89298e /drivers/leds
parent9c9ab51e86bf1f3a24eb3477cbe5d4fb09d386a5 (diff)
downloadlinux-0f85e8498a482cbfdab91fb2d1b81c6c8c1cfd15.tar.xz
leds: trigger: timer: Add initialization from Device Tree
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@kernel.org> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/trigger/ledtrig-timer.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/leds/trigger/ledtrig-timer.c b/drivers/leds/trigger/ledtrig-timer.c
index 7c14983781ee..ca898c1383be 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_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);