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| author | Heiner Kallweit <hkallweit1@gmail.com> | 2024-03-04 23:57:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-11 13:35:53 +0300 |
| commit | 2bc78ff25fca21b7899b14d43655cec2ea24e22f (patch) | |
| tree | 2ba8f44a137f3a6aa6586aa00bac924c4de46f6d /include/linux | |
| parent | b4e147d3f1fe835c9d9334c7eab83c21ff2d0149 (diff) | |
| download | linux-2bc78ff25fca21b7899b14d43655cec2ea24e22f.tar.xz | |
leds: trigger: Store brightness set by led_trigger_event()
[ Upstream commit 822c91e72eac568ed8d83765634f00decb45666c ]
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>
Stable-dep-of: ab477b766edd ("leds: triggers: Flush pending brightness before activating trigger")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/leds.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/leds.h b/include/linux/leds.h index 2bbff7519b73..79ab2dfd3c72 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -356,6 +356,9 @@ 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; @@ -409,6 +412,12 @@ 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) @@ -445,6 +454,12 @@ 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 functions */ |