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
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 */
12 };
13
14 struct acpi_video_device_brightness {
15 int curr;
16 int count;
17 int *levels;
18 struct acpi_video_brightness_flags flags;
19 };
20
21 struct 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
45 enum 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)
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);
61 /*
62 * Note: The value returned by acpi_video_handles_brightness_key_presses()
63 * may change over time and should not be cached.
64 */
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,
68 int *pmax_level);
69
70 extern enum acpi_backlight_type __acpi_video_get_backlight_type(bool native,
71 bool *auto_detect);
72
acpi_video_get_backlight_type(void)73 static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
74 {
75 return __acpi_video_get_backlight_type(false, NULL);
76 }
77
acpi_video_backlight_use_native(void)78 static inline bool acpi_video_backlight_use_native(void)
79 {
80 return __acpi_video_get_backlight_type(true, NULL) == acpi_backlight_native;
81 }
82 #else
acpi_video_register(void)83 static inline int acpi_video_register(void) { return -ENODEV; }
acpi_video_unregister(void)84 static inline void acpi_video_unregister(void) { return; }
acpi_video_register_backlight(void)85 static inline void acpi_video_register_backlight(void) { return; }
acpi_video_get_edid(struct acpi_device * device,int type,int device_id,void ** edid)86 static inline int acpi_video_get_edid(struct acpi_device *device, int type,
87 int device_id, void **edid)
88 {
89 return -ENODEV;
90 }
acpi_video_get_backlight_type(void)91 static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
92 {
93 return acpi_backlight_vendor;
94 }
acpi_video_backlight_use_native(void)95 static inline bool acpi_video_backlight_use_native(void)
96 {
97 return true;
98 }
acpi_video_handles_brightness_key_presses(void)99 static inline bool acpi_video_handles_brightness_key_presses(void)
100 {
101 return false;
102 }
acpi_video_get_levels(struct acpi_device * device,struct acpi_video_device_brightness ** dev_br,int * pmax_level)103 static inline int acpi_video_get_levels(struct acpi_device *device,
104 struct acpi_video_device_brightness **dev_br,
105 int *pmax_level)
106 {
107 return -ENODEV;
108 }
109 #endif
110
111 #endif
112