122 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef __ACPI_VIDEO_H3#define __ACPI_VIDEO_H4 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 126#define ACPI_VIDEO_DISPLAY_TV 227#define ACPI_VIDEO_DISPLAY_DVI 328#define ACPI_VIDEO_DISPLAY_LCD 429 30#define ACPI_VIDEO_DISPLAY_LEGACY_MONITOR 0x010031#define ACPI_VIDEO_DISPLAY_LEGACY_PANEL 0x011032#define ACPI_VIDEO_DISPLAY_LEGACY_TV 0x020033 34#define ACPI_VIDEO_NOTIFY_SWITCH 0x8035#define ACPI_VIDEO_NOTIFY_PROBE 0x8136#define ACPI_VIDEO_NOTIFY_CYCLE 0x8237#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x8338#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x8439#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x8540#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x8641#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x8742#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x8843#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x8944 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(false, NULL);77}78 79/*80 * This function MUST only be called by GPU drivers to check if the driver81 * should register a backlight class device. This function not only checks82 * if a GPU native backlight device should be registered it *also* tells83 * 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(true, NULL) == acpi_backlight_native;91}92#else93static 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#endif120 121#endif122