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leds: core: Add two new LED_BLINK_ flags 

This patch adds LED_BLINK_BRIGHTNESS_CHANGE flag to indicate that blink
brightness has changed, and LED_BLINK_DISABLE flag to indicate that
blinking deactivation has been requested. In order to use the flags
led_timer_function and set_brightness_delayed callbacks as well as
led_set_brightness() function are being modified. The main goal of these
modifications is to prepare set_brightness_work for extension of the
scope of its responsibilities.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
This commit is contained in:
Jacek Anaszewski 2015-10-07 11:10:39 +02:00
parent 2806e2ff48
commit f1e80c0741
2 changed files with 32 additions and 14 deletions
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36
drivers/leds/led-core.c
View File

@ -44,18 +44,18 @@ static void led_timer_function(unsigned long data)
brightness = led_get_brightness(led_cdev);
if (!brightness) {
/* Time to switch the LED on. */
if (led_cdev->delayed_set_value) {
led_cdev->blink_brightness =
led_cdev->delayed_set_value;
led_cdev->delayed_set_value = 0;
}
brightness = led_cdev->blink_brightness;
delay = led_cdev->blink_delay_on;
} else {
/* Store the current brightness value to be able
* to restore it when the delay_off period is over.
* Do it only if there is no pending blink brightness
* change, to avoid overwriting the new value.
*/
led_cdev->blink_brightness = brightness;
if (!(led_cdev->flags & LED_BLINK_BRIGHTNESS_CHANGE))
led_cdev->blink_brightness = brightness;
else
led_cdev->flags &= ~LED_BLINK_BRIGHTNESS_CHANGE;
brightness = LED_OFF;
delay = led_cdev->blink_delay_off;
}
@ -84,7 +84,11 @@ static void set_brightness_delayed(struct work_struct *ws)
struct led_classdev *led_cdev =
container_of(ws, struct led_classdev, set_brightness_work);
led_stop_software_blink(led_cdev);
if (led_cdev->flags & LED_BLINK_DISABLE) {
led_cdev->delayed_set_value = LED_OFF;
led_stop_software_blink(led_cdev);
led_cdev->flags &= ~LED_BLINK_DISABLE;
}
led_set_brightness_async(led_cdev, led_cdev->delayed_set_value);
}
@ -192,11 +196,23 @@ void led_set_brightness(struct led_classdev *led_cdev,
{
int ret = 0;
/* delay brightness if soft-blink is active */
/*
* In case blinking is on delay brightness setting
* until the next timer tick.
*/
if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
led_cdev->delayed_set_value = brightness;
if (brightness == LED_OFF)
/*
* If we need to disable soft blinking delegate this to the
* work queue task to avoid problems in case we are called
* from hard irq context.
*/
if (brightness == LED_OFF) {
led_cdev->flags |= LED_BLINK_DISABLE;
schedule_work(&led_cdev->set_brightness_work);
} else {
led_cdev->flags |= LED_BLINK_BRIGHTNESS_CHANGE;
led_cdev->blink_brightness = brightness;
}
return;
}

10
include/linux/leds.h
View File

@ -44,10 +44,12 @@ struct led_classdev {
#define LED_BLINK_ONESHOT (1 << 17)
#define LED_BLINK_ONESHOT_STOP (1 << 18)
#define LED_BLINK_INVERT (1 << 19)
#define LED_SYSFS_DISABLE (1 << 20)
#define SET_BRIGHTNESS_ASYNC (1 << 21)
#define SET_BRIGHTNESS_SYNC (1 << 22)
#define LED_DEV_CAP_FLASH (1 << 23)
#define LED_BLINK_BRIGHTNESS_CHANGE (1 << 20)
#define LED_BLINK_DISABLE (1 << 21)
#define LED_SYSFS_DISABLE (1 << 22)
#define SET_BRIGHTNESS_ASYNC (1 << 23)
#define SET_BRIGHTNESS_SYNC (1 << 24)
#define LED_DEV_CAP_FLASH (1 << 25)
/* Set LED brightness level */
/* Must not sleep, use a workqueue if needed */