projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Backlight Lowlevel Control Abstraction | |
| 3 | * | |
| 4 | * Copyright (C) 2003,2004 Hewlett-Packard Company | |
| 5 | * | |
| 6 | */ | |
| 7 | ||
| 8 | #ifndef _LINUX_BACKLIGHT_H | |
| 9 | #define _LINUX_BACKLIGHT_H | |
| 10 | ||
| 11 | #include <linux/device.h> | |
| 12 | #include <linux/notifier.h> | |
| 13 | ||
| 14 | struct backlight_device; | |
| 15 | struct fb_info; | |
| 16 | ||
| 17 | /* This structure defines all the properties of a backlight | |
| 18 | (usually attached to a LCD). */ | |
| 19 | struct backlight_properties { | |
| 20 | /* Owner module */ | |
| 21 | struct module *owner; | |
| 22 | /* Get the backlight power status (0: full on, 1..3: power saving | |
| 23 | modes; 4: full off), see FB_BLANK_XXX */ | |
| 24 | int (*get_power)(struct backlight_device *); | |
| 25 | /* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */ | |
| 26 | int (*set_power)(struct backlight_device *, int power); | |
| 27 | /* Maximal value for brightness (read-only) */ | |
| 28 | int max_brightness; | |
| 29 | /* Get current backlight brightness */ | |
| 30 | int (*get_brightness)(struct backlight_device *); | |
| 31 | /* Set backlight brightness (0..max_brightness) */ | |
| 32 | int (*set_brightness)(struct backlight_device *, int brightness); | |
| 33 | /* Check if given framebuffer device is the one bound to this backlight; | |
| 34 | return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */ | |
| 35 | int (*check_fb)(struct fb_info *); | |
| 36 | }; | |
| 37 | ||
| 38 | struct backlight_device { | |
| 39 | /* This protects the 'props' field. If 'props' is NULL, the driver that | |
| 40 | registered this device has been unloaded, and if class_get_devdata() | |
| 41 | points to something in the body of that driver, it is also invalid. */ | |
| 42 | struct semaphore sem; | |
| 43 | /* If this is NULL, the backing module is unloaded */ | |
| 44 | struct backlight_properties *props; | |
| 45 | /* The framebuffer notifier block */ | |
| 46 | struct notifier_block fb_notif; | |
| 47 | /* The class device structure */ | |
| 48 | struct class_device class_dev; | |
| 49 | }; | |
| 50 | ||
| 51 | extern struct backlight_device *backlight_device_register(const char *name, | |
| 52 | void *devdata, struct backlight_properties *bp); | |
| 53 | extern void backlight_device_unregister(struct backlight_device *bd); | |
| 54 | ||
| 55 | #define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev) | |
| 56 | ||
| 57 | #endif |