Allow registered backlight drivers to receive a notification when a backlight change is triggered via one of the siblings. sony-laptop needs this notification to be able to set backlight when ALS is enabled and setting brightness via _BCM becomes a no-op and only notifies SNC that "a change to the brightness level" was requested without giving any actual value.
Cc: Jingoo Han <[email protected]> Signed-off-by: Mattia Dongili <[email protected]> --- drivers/video/backlight/backlight.c | 10 ++++++++++ include/linux/backlight.h | 3 +++ 2 files changed, 13 insertions(+) diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index 5d05555..0f9d6ce 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -88,6 +88,7 @@ static inline void backlight_unregister_fb(struct backlight_device *bd) static void backlight_generate_event(struct backlight_device *bd, enum backlight_update_reason reason) { + struct backlight_device *obd; char *envp[2]; switch (reason) { @@ -104,6 +105,15 @@ static void backlight_generate_event(struct backlight_device *bd, envp[1] = NULL; kobject_uevent_env(&bd->dev.kobj, KOBJ_CHANGE, envp); sysfs_notify(&bd->dev.kobj, NULL, "actual_brightness"); + + /* notify other bl devices */ + list_for_each_entry(obd, &backlight_dev_list, entry) { + if (bd == obd || !obd->ops || !obd->ops->brightness_changed) + continue; + + obd->ops->brightness_changed(obd, bd->props.brightness, + bd->props.max_brightness); + } } static ssize_t bl_power_show(struct device *dev, struct device_attribute *attr, diff --git a/include/linux/backlight.h b/include/linux/backlight.h index 5f9cd96..974ae3c 100644 --- a/include/linux/backlight.h +++ b/include/linux/backlight.h @@ -55,6 +55,9 @@ struct backlight_ops { /* Check if given framebuffer device is the one bound to this backlight; return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */ int (*check_fb)(struct backlight_device *, struct fb_info *); + /* Callback to receive notification of a backlight change triggered by + a different backlight driver */ + void (*brightness_changed)(struct backlight_device *, int, int); }; /* This structure defines all the properties of a backlight */ -- 1.9.0 -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
