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leds: core: Drivers shouldn't enforce SYNC/ASYNC brightness setting 

This patch removes SET_BRIGHTNESS_ASYNC and SET_BRIGHTNESS_SYNC flags.
led_set_brightness() now calls led_set_brightness_nosleep() instead of
choosing between sync and async op basing on the flags defined by the
driver.

From now on, if a user wants to make sure that brightness will be set
synchronously, they have to use led_set_brightness_sync() API. It is now
being made publicly available since it has become apparent that it is
a caller who should decide whether brightness is to be set in
a synchronous or an asynchronous way.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
hifive-unleashed-5.1
Jacek Anaszewski 2015-10-07 11:10:43 +02:00
parent 1afcadfcd1
commit 13ae79bbe4
5 changed files with 35 additions and 35 deletions
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4
drivers/leds/led-class-flash.c
View File

@ -316,10 +316,6 @@ int led_classdev_flash_register(struct device *parent,
if (ret < 0)
return ret;
/* Setting a torch brightness needs to have immediate effect */
led_cdev->flags &= ~SET_BRIGHTNESS_ASYNC;
led_cdev->flags |= SET_BRIGHTNESS_SYNC;
return 0;
}
EXPORT_SYMBOL_GPL(led_classdev_flash_register);

2
drivers/leds/led-class.c
View File

@ -215,8 +215,6 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
if (!led_cdev->max_brightness)
led_cdev->max_brightness = LED_FULL;
led_cdev->flags |= SET_BRIGHTNESS_ASYNC;
led_update_brightness(led_cdev);
led_init_core(led_cdev);

32
drivers/leds/led-core.c
View File

@ -205,8 +205,6 @@ EXPORT_SYMBOL_GPL(led_stop_software_blink);
void led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
int ret = 0;
/*
* In case blinking is on delay brightness setting
* until the next timer tick.
@ -227,17 +225,7 @@ void led_set_brightness(struct led_classdev *led_cdev,
return;
}
if (led_cdev->flags & SET_BRIGHTNESS_ASYNC) {
led_set_brightness_nosleep(led_cdev, brightness);
return;
} else if (led_cdev->flags & SET_BRIGHTNESS_SYNC)
ret = led_set_brightness_sync(led_cdev, brightness);
else
ret = -EINVAL;
if (ret < 0)
dev_dbg(led_cdev->dev, "Setting LED brightness failed (%d)\n",
ret);
led_set_brightness_nosleep(led_cdev, brightness);
}
EXPORT_SYMBOL_GPL(led_set_brightness);
@ -268,6 +256,24 @@ void led_set_brightness_nosleep(struct led_classdev *led_cdev,
}
EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
int led_set_brightness_sync(struct led_classdev *led_cdev,
enum led_brightness value)
{
if (led_cdev->blink_delay_on || led_cdev->blink_delay_off)
return -EBUSY;
led_cdev->brightness = min(value, led_cdev->max_brightness);
if (led_cdev->flags & LED_SUSPENDED)
return 0;
if (led_cdev->brightness_set_blocking)
return led_cdev->brightness_set_blocking(led_cdev,
led_cdev->brightness);
return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(led_set_brightness_sync);
int led_update_brightness(struct led_classdev *led_cdev)
{
int ret = 0;

13
drivers/leds/leds.h
View File

@ -16,19 +16,6 @@
#include <linux/rwsem.h>
#include <linux/leds.h>
static inline int led_set_brightness_sync(struct led_classdev *led_cdev,
enum led_brightness value)
{
int ret = 0;
led_cdev->brightness = min(value, led_cdev->max_brightness);
if (!(led_cdev->flags & LED_SUSPENDED))
ret = led_cdev->brightness_set_blocking(led_cdev,
led_cdev->brightness);
return ret;
}
static inline int led_get_brightness(struct led_classdev *led_cdev)
{
return led_cdev->brightness;

19
include/linux/leds.h
View File

@ -47,9 +47,7 @@ struct led_classdev {
#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)
#define LED_DEV_CAP_FLASH (1 << 23)
/* Set LED brightness level */
/* Must not sleep, use a workqueue if needed */
@ -162,6 +160,21 @@ extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
*/
extern void led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness brightness);
/**
* led_set_brightness_sync - set LED brightness synchronously
* @led_cdev: the LED to set
* @brightness: the brightness to set it to
*
* Set an LED's brightness immediately. This function will block
* the caller for the time required for accessing device registers,
* and it can sleep.
*
* Returns: 0 on success or negative error value on failure
*/
extern int led_set_brightness_sync(struct led_classdev *led_cdev,
enum led_brightness value);
/**
* led_update_brightness - update LED brightness
* @led_cdev: the LED to query