Multiple LED triggers might need to access default pattern so add a
helper for that.
Signed-off-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
---
drivers/leds/led-class.c | 42 ++++++++++++++++++++++++++++++++++++++++++
include/linux/leds.h | 3 +++
2 files changed, 45 insertions(+)
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 3c7e3487b373..49eb64bffd4d 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -17,6 +17,7 @@
#include <linux/leds.h>
#include <linux/list.h>
#include <linux/module.h>
+#include <linux/of.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
@@ -244,6 +245,47 @@ static int led_classdev_next_name(const char *init_name, char *name,
}
/**
+ * led_classdev_get_default_pattern - return default pattern
+ *
+ * @led_cdev: the led_classdev structure for this device
+ * @size: pointer for storing the number of elements in returned array,
+ * modified only if return != NULL
+ *
+ * Return: Allocated array of integers with default pattern from DeviceTree
+ * or NULL. Caller is responsible for kfree().
+ */
+u32 *led_classdev_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))
+ goto err;
+
+ *size = count;
+
+ return pattern;
+
+err:
+ kfree(pattern);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(led_classdev_get_default_pattern);
+
+/**
* of_led_classdev_register - register a new object of led_classdev class.
*
* @parent: parent of LED device
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 5263f87e1d2c..70edf574ba81 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -129,6 +129,9 @@ struct led_classdev {
struct mutex led_access;
};
+extern u32 *led_classdev_get_default_pattern(struct led_classdev *led_cdev,
+ unsigned int *size);
+
extern int of_led_classdev_register(struct device *parent,
struct device_node *np,
struct led_classdev *led_cdev);
--
2.7.4
