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leds: triggers: let struct led_trigger::activate() return an error code

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Given that activating a trigger can fail, let the callback return an
indication. This prevents to have a trigger active according to the
"trigger" sysfs attribute but not functional.

All users are changed accordingly to return 0 for now. There is no intended
change in behaviour.

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 22:05:21 +02:00 • committed by Jacek Anaszewski
parent 033692eb3e
commit 2282e125a4
16 changed files with 101 additions and 45 deletions
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14
include/linux/leds.h
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@ -253,7 +253,7 @@ static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
struct led_trigger {
/* Trigger Properties */
const char *name;
void (*activate)(struct led_classdev *led_cdev);
int (*activate)(struct led_classdev *led_cdev);
void (*deactivate)(struct led_classdev *led_cdev);
/* LEDs under control by this trigger (for simple triggers) */
@ -288,8 +288,8 @@ extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
unsigned long *delay_off,
int invert);
extern void led_trigger_set_default(struct led_classdev *led_cdev);
extern void led_trigger_set(struct led_classdev *led_cdev,
struct led_trigger *trigger);
extern int led_trigger_set(struct led_classdev *led_cdev,
struct led_trigger *trigger);
extern void led_trigger_remove(struct led_classdev *led_cdev);
static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
@ -334,8 +334,12 @@ static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
unsigned long *delay_off,
int invert) {}
static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
static inline void led_trigger_set(struct led_classdev *led_cdev,
struct led_trigger *trigger) {}
static inline int led_trigger_set(struct led_classdev *led_cdev,
struct led_trigger *trigger)
{
return 0;
}
static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
{