1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/errno.h> /* for ENODEV */
6 #include <linux/types.h> /* for bool */
8 struct acpi_video_brightness_flags {
9 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
10 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
11 u8 _BQC_use_index:1; /* _BQC returns an index value */
14 struct acpi_video_device_brightness {
18 struct acpi_video_brightness_flags flags;
23 #define ACPI_VIDEO_CLASS "video"
25 #define ACPI_VIDEO_DISPLAY_CRT 1
26 #define ACPI_VIDEO_DISPLAY_TV 2
27 #define ACPI_VIDEO_DISPLAY_DVI 3
28 #define ACPI_VIDEO_DISPLAY_LCD 4
30 #define ACPI_VIDEO_DISPLAY_LEGACY_MONITOR 0x0100
31 #define ACPI_VIDEO_DISPLAY_LEGACY_PANEL 0x0110
32 #define ACPI_VIDEO_DISPLAY_LEGACY_TV 0x0200
34 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
35 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
36 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
37 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
38 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
39 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
40 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
41 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
42 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
43 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
45 enum acpi_backlight_type {
46 acpi_backlight_undef = -1,
47 acpi_backlight_none = 0,
49 acpi_backlight_vendor,
50 acpi_backlight_native,
51 acpi_backlight_nvidia_wmi_ec,
52 acpi_backlight_apple_gmux,
55 #if IS_ENABLED(CONFIG_ACPI_VIDEO)
56 extern int acpi_video_register(void);
57 extern void acpi_video_unregister(void);
58 extern void acpi_video_register_backlight(void);
59 extern int acpi_video_get_edid(struct acpi_device *device, int type,
60 int device_id, void **edid);
62 * Note: The value returned by acpi_video_handles_brightness_key_presses()
63 * may change over time and should not be cached.
65 extern bool acpi_video_handles_brightness_key_presses(void);
66 extern int acpi_video_get_levels(struct acpi_device *device,
67 struct acpi_video_device_brightness **dev_br,
70 extern enum acpi_backlight_type __acpi_video_get_backlight_type(bool native,
73 static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
75 return __acpi_video_get_backlight_type(false, NULL);
79 * This function MUST only be called by GPU drivers to check if the driver
80 * should register a backlight class device. This function not only checks
81 * if a GPU native backlight device should be registered it *also* tells
82 * the ACPI video-detect code that native GPU backlight control is available.
83 * Therefor calling this from any place other then the GPU driver is wrong!
84 * To check if GPU native backlight control is used in other places instead use:
85 * if (acpi_video_get_backlight_type() == acpi_backlight_native) { ... }
87 static inline bool acpi_video_backlight_use_native(void)
89 return __acpi_video_get_backlight_type(true, NULL) == acpi_backlight_native;
92 static inline int acpi_video_register(void) { return -ENODEV; }
93 static inline void acpi_video_unregister(void) { return; }
94 static inline void acpi_video_register_backlight(void) { return; }
95 static inline int acpi_video_get_edid(struct acpi_device *device, int type,
96 int device_id, void **edid)
100 static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
102 return acpi_backlight_vendor;
104 static inline bool acpi_video_backlight_use_native(void)
108 static inline bool acpi_video_handles_brightness_key_presses(void)
112 static inline int acpi_video_get_levels(struct acpi_device *device,
113 struct acpi_video_device_brightness **dev_br,