Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame^] | 22 | |
| 23 | /* Notify the backlight driver some property has changed */ |
| 24 | int (*update_status)(struct backlight_device *); |
| 25 | /* Return the current backlight brightness (accounting for power, |
| 26 | fb_blank etc.) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | int (*get_brightness)(struct backlight_device *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | /* Check if given framebuffer device is the one bound to this backlight; |
| 29 | return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */ |
| 30 | int (*check_fb)(struct fb_info *); |
Richard Purdie | 6ca0176 | 2006-03-31 02:31:49 -0800 | [diff] [blame^] | 31 | |
| 32 | /* Current User requested brightness (0 - max_brightness) */ |
| 33 | int brightness; |
| 34 | /* Maximal value for brightness (read-only) */ |
| 35 | int max_brightness; |
| 36 | /* Current FB Power mode (0: full on, 1..3: power saving |
| 37 | modes; 4: full off), see FB_BLANK_XXX */ |
| 38 | int power; |
| 39 | /* FB Blanking active? (values as for power) */ |
| 40 | int fb_blank; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | }; |
| 42 | |
| 43 | struct backlight_device { |
| 44 | /* This protects the 'props' field. If 'props' is NULL, the driver that |
| 45 | registered this device has been unloaded, and if class_get_devdata() |
| 46 | points to something in the body of that driver, it is also invalid. */ |
| 47 | struct semaphore sem; |
| 48 | /* If this is NULL, the backing module is unloaded */ |
| 49 | struct backlight_properties *props; |
| 50 | /* The framebuffer notifier block */ |
| 51 | struct notifier_block fb_notif; |
| 52 | /* The class device structure */ |
| 53 | struct class_device class_dev; |
| 54 | }; |
| 55 | |
| 56 | extern struct backlight_device *backlight_device_register(const char *name, |
| 57 | void *devdata, struct backlight_properties *bp); |
| 58 | extern void backlight_device_unregister(struct backlight_device *bd); |
| 59 | |
| 60 | #define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev) |
| 61 | |
| 62 | #endif |