| 1 | /* |
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| 2 | * LCD 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_LCD_H |
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| 9 | #define _LINUX_LCD_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 lcd_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 LCD flat panel. */ |
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| 18 | struct lcd_properties { |
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| 19 | /* Owner module */ |
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| 20 | struct module *owner; |
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| 21 | /* Get the LCD panel power status (0: full on, 1..3: controller |
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| 22 | power on, flat panel power off, 4: full off), see FB_BLANK_XXX */ |
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| 23 | int (*get_power)(struct lcd_device *); |
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| 24 | /* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */ |
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| 25 | int (*set_power)(struct lcd_device *, int power); |
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| 26 | /* The maximum value for contrast (read-only) */ |
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| 27 | int max_contrast; |
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| 28 | /* Get the current contrast setting (0-max_contrast) */ |
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| 29 | int (*get_contrast)(struct lcd_device *); |
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| 30 | /* Set LCD panel contrast */ |
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| 31 | int (*set_contrast)(struct lcd_device *, int contrast); |
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| 32 | /* Check if given framebuffer device is the one LCD is bound to; |
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| 33 | return 0 if not, !=0 if it is. If NULL, lcd always matches the fb. */ |
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| 34 | int (*check_fb)(struct fb_info *); |
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| 35 | }; |
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| 36 | |
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| 37 | struct lcd_device { |
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| 38 | /* This protects the 'props' field. If 'props' is NULL, the driver that |
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| 39 | registered this device has been unloaded, and if class_get_devdata() |
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| 40 | points to something in the body of that driver, it is also invalid. */ |
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| 41 | struct semaphore sem; |
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| 42 | /* If this is NULL, the backing module is unloaded */ |
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| 43 | struct lcd_properties *props; |
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| 44 | /* The framebuffer notifier block */ |
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| 45 | struct notifier_block fb_notif; |
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| 46 | /* The class device structure */ |
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| 47 | struct class_device class_dev; |
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| 48 | }; |
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| 49 | |
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| 50 | extern struct lcd_device *lcd_device_register(const char *name, |
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| 51 | void *devdata, struct lcd_properties *lp); |
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| 52 | extern void lcd_device_unregister(struct lcd_device *ld); |
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| 53 | |
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| 54 | #define to_lcd_device(obj) container_of(obj, struct lcd_device, class_dev) |
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| 55 | |
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| 56 | #endif |
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