diff options
Diffstat (limited to 'drivers/video/backlight/backlight.c')
| -rw-r--r-- | drivers/video/backlight/backlight.c | 39 |
1 files changed, 24 insertions, 15 deletions
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index bddc8b17a..288318ad2 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -164,18 +164,10 @@ static ssize_t brightness_show(struct device *dev, return sprintf(buf, "%d\n", bd->props.brightness); } -static ssize_t brightness_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) +int backlight_device_set_brightness(struct backlight_device *bd, + unsigned long brightness) { - int rc; - struct backlight_device *bd = to_backlight_device(dev); - unsigned long brightness; - - rc = kstrtoul(buf, 0, &brightness); - if (rc) - return rc; - - rc = -ENXIO; + int rc = -ENXIO; mutex_lock(&bd->ops_lock); if (bd->ops) { @@ -185,7 +177,7 @@ static ssize_t brightness_store(struct device *dev, pr_debug("set brightness to %lu\n", brightness); bd->props.brightness = brightness; backlight_update_status(bd); - rc = count; + rc = 0; } } mutex_unlock(&bd->ops_lock); @@ -194,6 +186,23 @@ static ssize_t brightness_store(struct device *dev, return rc; } +EXPORT_SYMBOL(backlight_device_set_brightness); + +static ssize_t brightness_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int rc; + struct backlight_device *bd = to_backlight_device(dev); + unsigned long brightness; + + rc = kstrtoul(buf, 0, &brightness); + if (rc) + return rc; + + rc = backlight_device_set_brightness(bd, brightness); + + return rc ? rc : count; +} static DEVICE_ATTR_RW(brightness); static ssize_t type_show(struct device *dev, struct device_attribute *attr, @@ -380,7 +389,7 @@ struct backlight_device *backlight_device_register(const char *name, } EXPORT_SYMBOL(backlight_device_register); -bool backlight_device_registered(enum backlight_type type) +struct backlight_device *backlight_device_get_by_type(enum backlight_type type) { bool found = false; struct backlight_device *bd; @@ -394,9 +403,9 @@ bool backlight_device_registered(enum backlight_type type) } mutex_unlock(&backlight_dev_list_mutex); - return found; + return found ? bd : NULL; } -EXPORT_SYMBOL(backlight_device_registered); +EXPORT_SYMBOL(backlight_device_get_by_type); /** * backlight_device_unregister - unregisters a backlight device object. |