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backlight: Add backlight device (un)registration notification

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Some firmware drivers, ie acpi-video want to get themselves out of the
way (in some cases) when their also is a raw backlight device available.

Due to module loading ordering being unknown, acpi-video cannot be certain
that the backlight_device_registered(BACKLIGHT_RAW) it does for this is
the final verdict wrt there being a BACKLIGHT_RAW device.

By adding notification acpi-video can listen for backlight devices showing
up after it has loaded, and unregister its backlight device if desired.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede
2014-05-21 15:39:54 +02:00
committed by Rafael J. Wysocki
parent bee564430f
commit 3cc6919bd6
2 changed files with 47 additions and 0 deletions
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7
include/linux/backlight.h
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@@ -40,6 +40,11 @@ enum backlight_type {
BACKLIGHT_TYPE_MAX,
};
enum backlight_notification {
BACKLIGHT_REGISTERED,
BACKLIGHT_UNREGISTERED,
};
struct backlight_device;
struct fb_info;
@@ -133,6 +138,8 @@ extern void devm_backlight_device_unregister(struct device *dev,
extern void backlight_force_update(struct backlight_device *bd,
enum backlight_update_reason reason);
extern bool backlight_device_registered(enum backlight_type type);
extern int backlight_register_notifier(struct notifier_block *nb);
extern int backlight_unregister_notifier(struct notifier_block *nb);
#define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)