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