diff options
| author | Jean-Jacques Hiblot <jjhiblot@traphandler.com> | 2023-07-28 17:37:28 +0200 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2023-08-17 09:00:06 +0100 |
| commit | afb48153220d35f330d0d979792920a31f7d9a81 (patch) | |
| tree | 54ce29822b21abc872002ab3ac0d4b96bc312965 | |
| parent | 179507fcd5e448eaecae9b69f0fb30965c3c4466 (diff) | |
leds: Provide devm_of_led_get_optional()
Add an optional variant of devm_of_led_get(). It behaves the same as
devm_of_led_get() except where the LED doesn't exist. In this case,
instead of returning -ENOENT, the function returns NULL.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20230728153731.3742339-2-jjhiblot@traphandler.com
Signed-off-by: Lee Jones <lee@kernel.org>
| -rw-r--r-- | drivers/leds/led-class.c | 25 | ||||
| -rw-r--r-- | include/linux/leds.h | 2 |
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 4758da2b59cf..78068b06d009 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -402,6 +402,31 @@ void led_remove_lookup(struct led_lookup_data *led_lookup) } EXPORT_SYMBOL_GPL(led_remove_lookup); +/** + * devm_of_led_get_optional - Resource-managed request of an optional LED device + * @dev: LED consumer + * @index: index of the LED to obtain in the consumer + * + * The device node of the device is parsed to find the requested LED device. + * The LED device returned from this function is automatically released + * on driver detach. + * + * @return a pointer to a LED device, ERR_PTR(errno) on failure and NULL if the + * led was not found. + */ +struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev, + int index) +{ + struct led_classdev *led; + + led = devm_of_led_get(dev, index); + if (IS_ERR(led) && PTR_ERR(led) == -ENOENT) + return NULL; + + return led; +} +EXPORT_SYMBOL_GPL(devm_of_led_get_optional); + static int led_classdev_next_name(const char *init_name, char *name, size_t len) { diff --git a/include/linux/leds.h b/include/linux/leds.h index 7d428100b42b..8740b4e47f88 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -313,6 +313,8 @@ extern struct led_classdev *of_led_get(struct device_node *np, int index); extern void led_put(struct led_classdev *led_cdev); struct led_classdev *__must_check devm_of_led_get(struct device *dev, int index); +struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev, + int index); /** * led_blink_set - set blinking with software fallback |