diff options
| -rw-r--r-- | drivers/leds/led-core.c | 24 | ||||
| -rw-r--r-- | drivers/leds/led-triggers.c | 2 | ||||
| -rw-r--r-- | include/linux/leds.h | 24 |
3 files changed, 49 insertions, 1 deletions
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c index e61acc785410..b9b1295833c9 100644 --- a/drivers/leds/led-core.c +++ b/drivers/leds/led-core.c @@ -152,6 +152,13 @@ static void set_brightness_delayed(struct work_struct *ws) if (test_and_clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags)) set_brightness_delayed_set_brightness(led_cdev, led_cdev->delayed_set_value); + + if (test_and_clear_bit(LED_SET_BLINK, &led_cdev->work_flags)) { + unsigned long delay_on = led_cdev->delayed_delay_on; + unsigned long delay_off = led_cdev->delayed_delay_off; + + led_blink_set(led_cdev, &delay_on, &delay_off); + } } static void led_set_software_blink(struct led_classdev *led_cdev, @@ -246,6 +253,22 @@ void led_blink_set_oneshot(struct led_classdev *led_cdev, } EXPORT_SYMBOL_GPL(led_blink_set_oneshot); +void led_blink_set_nosleep(struct led_classdev *led_cdev, unsigned long delay_on, + unsigned long delay_off) +{ + /* If necessary delegate to a work queue task. */ + if (led_cdev->blink_set && led_cdev->brightness_set_blocking) { + led_cdev->delayed_delay_on = delay_on; + led_cdev->delayed_delay_off = delay_off; + set_bit(LED_SET_BLINK, &led_cdev->work_flags); + schedule_work(&led_cdev->set_brightness_work); + return; + } + + led_blink_set(led_cdev, &delay_on, &delay_off); +} +EXPORT_SYMBOL_GPL(led_blink_set_nosleep); + void led_stop_software_blink(struct led_classdev *led_cdev) { del_timer_sync(&led_cdev->blink_timer); @@ -301,6 +324,7 @@ void led_set_brightness_nopm(struct led_classdev *led_cdev, unsigned int value) set_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags); } else { clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags); + clear_bit(LED_SET_BLINK, &led_cdev->work_flags); set_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags); } diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c index e06361165e9b..8214d3f7bc5f 100644 --- a/drivers/leds/led-triggers.c +++ b/drivers/leds/led-triggers.c @@ -409,7 +409,7 @@ static void led_trigger_blink_setup(struct led_trigger *trig, led_blink_set_oneshot(led_cdev, &delay_on, &delay_off, invert); else - led_blink_set(led_cdev, &delay_on, &delay_off); + led_blink_set_nosleep(led_cdev, delay_on, delay_off); } rcu_read_unlock(); } diff --git a/include/linux/leds.h b/include/linux/leds.h index de813fe96a20..50b2f8f153fb 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -127,6 +127,7 @@ struct led_classdev { /* Brightness off also disables hw-blinking so it is a separate action */ #define LED_SET_BRIGHTNESS_OFF 6 #define LED_SET_BRIGHTNESS 7 +#define LED_SET_BLINK 8 /* Set LED brightness level * Must not sleep. Use brightness_set_blocking for drivers @@ -150,6 +151,10 @@ struct led_classdev { * match the values specified exactly. * Deactivate blinking again when the brightness is set to LED_OFF * via the brightness_set() callback. + * For led_blink_set_nosleep() the LED core assumes that blink_set + * implementations, of drivers which do not use brightness_set_blocking, + * will not sleep. Therefor if brightness_set_blocking is not set + * this function must not sleep! */ int (*blink_set)(struct led_classdev *led_cdev, unsigned long *delay_on, @@ -173,6 +178,8 @@ struct led_classdev { struct work_struct set_brightness_work; int delayed_set_value; + unsigned long delayed_delay_on; + unsigned long delayed_delay_off; #ifdef CONFIG_LEDS_TRIGGERS /* Protects the trigger data below */ @@ -275,12 +282,27 @@ struct led_classdev *__must_check devm_of_led_get(struct device *dev, * software blinking if there is no hardware blinking or if * the LED refuses the passed values. * + * This function may sleep! + * * Note that if software blinking is active, simply calling * led_cdev->brightness_set() will not stop the blinking, * use led_set_brightness() instead. */ void led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off); + +/** + * led_blink_set_nosleep - set blinking, guaranteed to not sleep + * @led_cdev: the LED to start blinking + * @delay_on: the time it should be on (in ms) + * @delay_off: the time it should ble off (in ms) + * + * This function makes the LED blink and is guaranteed to not sleep. Otherwise + * this is the same as led_blink_set(), see led_blink_set() for details. + */ +void led_blink_set_nosleep(struct led_classdev *led_cdev, unsigned long delay_on, + unsigned long delay_off); + /** * led_blink_set_oneshot - do a oneshot software blink * @led_cdev: the LED to start blinking @@ -294,6 +316,8 @@ void led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on, * * If invert is set, led blinks for delay_off first, then for * delay_on and leave the led on after the on-off cycle. + * + * This function is guaranteed not to sleep. */ void led_blink_set_oneshot(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off, |