From mboxrd@z Thu Jan 1 00:00:00 1970 From: Krzysztof Kozlowski Subject: [PATCH v3 2/5] leds: Add helper for getting default pattern from Device Tree Date: Wed, 12 Dec 2018 12:16:43 +0100 Message-ID: <1544613406-27026-3-git-send-email-krzk@kernel.org> References: <1544613406-27026-1-git-send-email-krzk@kernel.org> Return-path: In-Reply-To: <1544613406-27026-1-git-send-email-krzk@kernel.org> Sender: linux-kernel-owner@vger.kernel.org To: Jacek Anaszewski , Pavel Machek , Rob Herring , Mark Rutland , Krzysztof Kozlowski , Baolin Wang , linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-leds@vger.kernel.org Multiple LED triggers might need to access default pattern so add a helper for that. Signed-off-by: Krzysztof Kozlowski --- New patch in the series --- drivers/leds/led-class.c | 25 +++++++++++++++++++++++++ include/linux/leds.h | 3 +++ 2 files changed, 28 insertions(+) diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 3c7e3487b373..44b95e6480f6 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -244,6 +245,30 @@ 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 + * + * Return: Null terminated string with default pattern from DeviceTree or NULL + */ +const char *led_classdev_get_default_pattern(struct led_classdev *led_cdev) +{ + struct device_node *np = dev_of_node(led_cdev->dev); + const char *pattern; + + if (!np) + return NULL; + + if (of_property_read_string(np, "led-pattern", &pattern)) + return NULL; + + if (!strlen(pattern)) + return NULL; + + return 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..9da2bfa183ea 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -129,6 +129,9 @@ struct led_classdev { struct mutex led_access; }; +extern const char * +led_classdev_get_default_pattern(struct led_classdev *led_cdev); + extern int of_led_classdev_register(struct device *parent, struct device_node *np, struct led_classdev *led_cdev); -- 2.7.4