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leds: trigger: Store brightness set by led_trigger_event()

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If a simple trigger is assigned to a LED, then the LED may be off until
the next led_trigger_event() call. This may be an issue for simple
triggers with rare led_trigger_event() calls, e.g. power supply
charging indicators (drivers/power/supply/power_supply_leds.c).
Therefore persist the brightness value of the last led_trigger_event()
call and use this value if the trigger is assigned to a LED.
In addition add a getter for the trigger brightness value.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/b1358b25-3f30-458d-8240-5705ae007a8a@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Heiner Kallweit 2024-03-04 21:57:30 +01:00 committed by Lee Jones
parent 4cece76496
commit 822c91e72e
2 changed files with 19 additions and 2 deletions
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6
drivers/leds/led-triggers.c
View File

@ -194,11 +194,11 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
spin_unlock(&trig->leddev_list_lock);
led_cdev->trigger = trig;
ret = 0;
if (trig->activate)
ret = trig->activate(led_cdev);
else
ret = 0;
led_set_brightness(led_cdev, trig->brightness);
if (ret)
goto err_activate;
@ -387,6 +387,8 @@ void led_trigger_event(struct led_trigger *trig,
if (!trig)
return;
trig->brightness = brightness;
rcu_read_lock();
list_for_each_entry_rcu(led_cdev, &trig->led_cdevs, trig_list)
led_set_brightness(led_cdev, brightness);

15
include/linux/leds.h
View File

@ -455,6 +455,9 @@ struct led_trigger {
int (*activate)(struct led_classdev *led_cdev);
void (*deactivate)(struct led_classdev *led_cdev);
/* Brightness set by led_trigger_event */
enum led_brightness brightness;
/* LED-private triggers have this set */
struct led_hw_trigger_type *trigger_type;
@ -508,6 +511,12 @@ static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
return led_cdev->trigger_data;
}
static inline enum led_brightness
led_trigger_get_brightness(const struct led_trigger *trigger)
{
return trigger ? trigger->brightness : LED_OFF;
}
#define module_led_trigger(__led_trigger) \
module_driver(__led_trigger, led_trigger_register, \
led_trigger_unregister)
@ -544,6 +553,12 @@ static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
return NULL;
}
static inline enum led_brightness
led_trigger_get_brightness(const struct led_trigger *trigger)
{
return LED_OFF;
}
#endif /* CONFIG_LEDS_TRIGGERS */
/* Trigger specific enum */