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| author | Krzysztof Kozlowski <krzk@kernel.org> | 2019-01-09 15:44:46 +0100 |
|---|---|---|
| committer | Jacek Anaszewski <jacek.anaszewski@gmail.com> | 2019-01-16 22:08:07 +0100 |
| commit | 8e1f456129e61371fb190c71ea182a9f6e21282e (patch) | |
| tree | c8bd7b1c9b5ff1301d832dd546064cd24ba4d7d6 | |
| parent | 1dd7093742517b4aa362d22eaff8eef133d876ce (diff) | |
| download | linux-8e1f456129e61371fb190c71ea182a9f6e21282e.tar.gz linux-8e1f456129e61371fb190c71ea182a9f6e21282e.tar.bz2 linux-8e1f456129e61371fb190c71ea182a9f6e21282e.zip | |
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>
| -rw-r--r-- | drivers/leds/led-core.c | 30 | ||||
| -rw-r--r-- | include/linux/leds.h | 13 |
2 files changed, 43 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) { diff --git a/include/linux/leds.h b/include/linux/leds.h index 5263f87e1d2c..78204650fe2a 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -219,6 +219,19 @@ extern int led_set_brightness_sync(struct led_classdev *led_cdev, extern int led_update_brightness(struct led_classdev *led_cdev); /** + * led_get_default_pattern - return default pattern + * + * @led_cdev: the LED to get default pattern for + * @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 device tree + * or NULL. Caller is responsible for kfree(). + */ +extern u32 *led_get_default_pattern(struct led_classdev *led_cdev, + unsigned int *size); + +/** * led_sysfs_disable - disable LED sysfs interface * @led_cdev: the LED to set * |