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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};
52
53#if IS_ENABLED(CONFIG_ACPI_VIDEO)
54extern int acpi_video_register(void);
55extern void acpi_video_unregister(void);
56extern int acpi_video_get_edid(struct acpi_device *device, int type,
57 int device_id, void **edid);
58extern enum acpi_backlight_type acpi_video_get_backlight_type(void);
59extern void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type);
60/*
61 * Note: The value returned by acpi_video_handles_brightness_key_presses()
62 * may change over time and should not be cached.
63 */
64extern bool acpi_video_handles_brightness_key_presses(void);
65extern int acpi_video_get_levels(struct acpi_device *device,
66 struct acpi_video_device_brightness **dev_br,
67 int *pmax_level);
68#else
69static inline int acpi_video_register(void) { return -ENODEV; }
70static inline void acpi_video_unregister(void) { return; }
71static inline int acpi_video_get_edid(struct acpi_device *device, int type,
72 int device_id, void **edid)
73{
74 return -ENODEV;
75}
76static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
77{
78 return acpi_backlight_vendor;
79}
80static inline void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
81{
82}
83static inline bool acpi_video_handles_brightness_key_presses(void)
84{
85 return false;
86}
87static inline int acpi_video_get_levels(struct acpi_device *device,
88 struct acpi_video_device_brightness **dev_br,
89 int *pmax_level)
90{
91 return -ENODEV;
92}
93#endif
94
95#endif
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};
54
55#if IS_ENABLED(CONFIG_ACPI_VIDEO)
56extern int acpi_video_register(void);
57extern void acpi_video_unregister(void);
58extern void acpi_video_register_backlight(void);
59extern int acpi_video_get_edid(struct acpi_device *device, int type,
60 int device_id, void **edid);
61/*
62 * Note: The value returned by acpi_video_handles_brightness_key_presses()
63 * may change over time and should not be cached.
64 */
65extern bool acpi_video_handles_brightness_key_presses(void);
66extern int acpi_video_get_levels(struct acpi_device *device,
67 struct acpi_video_device_brightness **dev_br,
68 int *pmax_level);
69
70extern enum acpi_backlight_type __acpi_video_get_backlight_type(bool native,
71 bool *auto_detect);
72
73static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
74{
75 return __acpi_video_get_backlight_type(false, NULL);
76}
77
78/*
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) { ... }
86 */
87static inline bool acpi_video_backlight_use_native(void)
88{
89 return __acpi_video_get_backlight_type(true, NULL) == acpi_backlight_native;
90}
91#else
92static inline int acpi_video_register(void) { return -ENODEV; }
93static inline void acpi_video_unregister(void) { return; }
94static inline void acpi_video_register_backlight(void) { return; }
95static inline int acpi_video_get_edid(struct acpi_device *device, int type,
96 int device_id, void **edid)
97{
98 return -ENODEV;
99}
100static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
101{
102 return acpi_backlight_vendor;
103}
104static inline bool acpi_video_backlight_use_native(void)
105{
106 return true;
107}
108static inline bool acpi_video_handles_brightness_key_presses(void)
109{
110 return false;
111}
112static inline int acpi_video_get_levels(struct acpi_device *device,
113 struct acpi_video_device_brightness **dev_br,
114 int *pmax_level)
115{
116 return -ENODEV;
117}
118#endif
119
120#endif