include/acpi/video.h

   1 #ifndef __ACPI_VIDEO_H
   2 #define __ACPI_VIDEO_H
   3
   4 #include <linux/errno.h> /* for ENODEV */
   5 #include <linux/types.h> /* for bool */
   6
   7 struct acpi_video_brightness_flags {
   8         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
   9         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order */
  10         u8 _BQC_use_index:1;            /* _BQC returns an index value */
  11 };
  12
  13 struct acpi_video_device_brightness {
  14         int curr;
  15         int count;
  16         int *levels;
  17         struct acpi_video_brightness_flags flags;
  18 };
  19
  20 struct acpi_device;
  21
  22 #define ACPI_VIDEO_CLASS        "video"
  23
  24 #define ACPI_VIDEO_DISPLAY_CRT  1
  25 #define ACPI_VIDEO_DISPLAY_TV   2
  26 #define ACPI_VIDEO_DISPLAY_DVI  3
  27 #define ACPI_VIDEO_DISPLAY_LCD  4
  28
  29 #define ACPI_VIDEO_DISPLAY_LEGACY_MONITOR 0x0100
  30 #define ACPI_VIDEO_DISPLAY_LEGACY_PANEL   0x0110
  31 #define ACPI_VIDEO_DISPLAY_LEGACY_TV      0x0200
  32
  33 enum acpi_backlight_type {
  34         acpi_backlight_undef = -1,
  35         acpi_backlight_none = 0,
  36         acpi_backlight_video,
  37         acpi_backlight_vendor,
  38         acpi_backlight_native,
  39 };
  40
  41 #if IS_ENABLED(CONFIG_ACPI_VIDEO)
  42 extern int acpi_video_register(void);
  43 extern void acpi_video_unregister(void);
  44 extern int acpi_video_get_edid(struct acpi_device *device, int type,
  45                                int device_id, void **edid);
  46 extern enum acpi_backlight_type acpi_video_get_backlight_type(void);
  47 extern void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type);
  48 /*
  49  * Note: The value returned by acpi_video_handles_brightness_key_presses()
  50  * may change over time and should not be cached.
  51  */
  52 extern bool acpi_video_handles_brightness_key_presses(void);
  53 extern int acpi_video_get_levels(struct acpi_device *device,
  54                                  struct acpi_video_device_brightness **dev_br,
  55                                  int *pmax_level);
  56 #else
  57 static inline int acpi_video_register(void) { return -ENODEV; }
  58 static inline void acpi_video_unregister(void) { return; }
  59 static inline int acpi_video_get_edid(struct acpi_device *device, int type,
  60                                       int device_id, void **edid)
  61 {
  62         return -ENODEV;
  63 }
  64 static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
  65 {
  66         return acpi_backlight_vendor;
  67 }
  68 static inline void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
  69 {
  70 }
  71 static inline bool acpi_video_handles_brightness_key_presses(void)
  72 {
  73         return false;
  74 }
  75 static inline int acpi_video_get_levels(struct acpi_device *device,
  76                         struct acpi_video_device_brightness **dev_br,
  77                         int *pmax_level)
  78 {
  79         return -ENODEV;
  80 }
  81 #endif
  82
  83 #endif