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authorKrzysztof Kozlowski <krzk@kernel.org>2019-01-09 15:44:46 +0100
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2019-01-16 22:08:07 +0100
commit8e1f456129e61371fb190c71ea182a9f6e21282e (patch)
treec8bd7b1c9b5ff1301d832dd546064cd24ba4d7d6 /drivers/leds
parent1dd7093742517b4aa362d22eaff8eef133d876ce (diff)
downloadlinux-8e1f456129e61371fb190c71ea182a9f6e21282e.tar.bz2
leds: Add helper for getting default pattern from Device Tree
Multiple LED triggers might need to access default pattern so add a helper for that. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/led-core.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index ede4fa0ac2cc..e3da7c03da1b 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -16,7 +16,9 @@
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
+#include <linux/of.h>
#include <linux/rwsem.h>
+#include <linux/slab.h>
#include "leds.h"
DECLARE_RWSEM(leds_list_lock);
@@ -310,6 +312,34 @@ int led_update_brightness(struct led_classdev *led_cdev)
}
EXPORT_SYMBOL_GPL(led_update_brightness);
+u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)
+{
+ struct device_node *np = dev_of_node(led_cdev->dev);
+ u32 *pattern;
+ int count;
+
+ if (!np)
+ return NULL;
+
+ count = of_property_count_u32_elems(np, "led-pattern");
+ if (count < 0)
+ return NULL;
+
+ pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
+ if (!pattern)
+ return NULL;
+
+ if (of_property_read_u32_array(np, "led-pattern", pattern, count)) {
+ kfree(pattern);
+ return NULL;
+ }
+
+ *size = count;
+
+ return pattern;
+}
+EXPORT_SYMBOL_GPL(led_get_default_pattern);
+
/* Caller must ensure led_cdev->led_access held */
void led_sysfs_disable(struct led_classdev *led_cdev)
{