1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ACPI_VIDEO_H
3#define __ACPI_VIDEO_H
4
5#include <linux/errno.h> /* for ENODEV */
6#include <linux/types.h> /* for bool */
7
8struct 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 */
12};
13
14struct acpi_video_device_brightness {
15 int curr;
16 int count;
17 int *levels;
18 struct acpi_video_brightness_flags flags;
19};
20
21struct acpi_device;
22
23#define ACPI_VIDEO_CLASS "video"
24
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
29
30#define ACPI_VIDEO_DISPLAY_LEGACY_MONITOR 0x0100
31#define ACPI_VIDEO_DISPLAY_LEGACY_PANEL 0x0110
32#define ACPI_VIDEO_DISPLAY_LEGACY_TV 0x0200
33
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
44
45enum acpi_backlight_type {
46 acpi_backlight_undef = -1,
47 acpi_backlight_none = 0,
48 acpi_backlight_video,
49 acpi_backlight_vendor,
50 acpi_backlight_native,
51 acpi_backlight_nvidia_wmi_ec,
52 acpi_backlight_apple_gmux,
53 acpi_backlight_dell_uart,
54};
55
56#if IS_ENABLED(CONFIG_ACPI_VIDEO)
57extern int acpi_video_register(void);
58extern void acpi_video_unregister(void);
59extern void acpi_video_register_backlight(void);
60extern int acpi_video_get_edid(struct acpi_device *device, int type,
61 int device_id, void **edid);
62/*
63 * Note: The value returned by acpi_video_handles_brightness_key_presses()
64 * may change over time and should not be cached.
65 */
66extern bool acpi_video_handles_brightness_key_presses(void);
67extern int acpi_video_get_levels(struct acpi_device *device,
68 struct acpi_video_device_brightness **dev_br,
69 int *pmax_level);
70
71extern enum acpi_backlight_type __acpi_video_get_backlight_type(bool native,
72 bool *auto_detect);
73
74static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
75{
76 return __acpi_video_get_backlight_type(native: false, NULL);
77}
78
79/*
80 * This function MUST only be called by GPU drivers to check if the driver
81 * should register a backlight class device. This function not only checks
82 * if a GPU native backlight device should be registered it *also* tells
83 * the ACPI video-detect code that native GPU backlight control is available.
84 * Therefor calling this from any place other then the GPU driver is wrong!
85 * To check if GPU native backlight control is used in other places instead use:
86 * if (acpi_video_get_backlight_type() == acpi_backlight_native) { ... }
87 */
88static inline bool acpi_video_backlight_use_native(void)
89{
90 return __acpi_video_get_backlight_type(native: true, NULL) == acpi_backlight_native;
91}
92#else
93static inline int acpi_video_register(void) { return -ENODEV; }
94static inline void acpi_video_unregister(void) { return; }
95static inline void acpi_video_register_backlight(void) { return; }
96static inline int acpi_video_get_edid(struct acpi_device *device, int type,
97 int device_id, void **edid)
98{
99 return -ENODEV;
100}
101static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
102{
103 return acpi_backlight_vendor;
104}
105static inline bool acpi_video_backlight_use_native(void)
106{
107 return true;
108}
109static inline bool acpi_video_handles_brightness_key_presses(void)
110{
111 return false;
112}
113static inline int acpi_video_get_levels(struct acpi_device *device,
114 struct acpi_video_device_brightness **dev_br,
115 int *pmax_level)
116{
117 return -ENODEV;
118}
119#endif
120
121#endif
122