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leds: triggers: add device attribute support

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As many triggers use device attributes, add support for these in
led_trigger_set which allows simplifying the drivers accordingly.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Uwe Kleine-König
2018-07-02 22:05:22 +02:00
committed by Jacek Anaszewski
parent 2282e125a4
commit a7e7a31563
2 changed files with 23 additions and 0 deletions
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11
include/linux/leds.h
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@@ -262,8 +262,19 @@ struct led_trigger {
/* Link to next registered trigger */
struct list_head next_trig;
const struct attribute_group **groups;
};
/*
* Currently the attributes in struct led_trigger::groups are added directly to
* the LED device. As this might change in the future, the following
* macros abstract getting the LED device and its trigger_data from the dev
* parameter passed to the attribute accessor functions.
*/
#define led_trigger_get_led(dev) ((struct led_classdev *)dev_get_drvdata((dev)))
#define led_trigger_get_drvdata(dev) (led_get_trigger_data(led_trigger_get_led(dev)))
ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,