include/linux/lcd.h

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