1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
4 */
5
6 #ifndef __PLATFORM_DATA_X86_NVIDIA_WMI_EC_BACKLIGHT_H
7 #define __PLATFORM_DATA_X86_NVIDIA_WMI_EC_BACKLIGHT_H
8
9 #define WMI_BRIGHTNESS_GUID "603E9613-EF25-4338-A3D0-C46177516DB7"
10
11 /**
12 * enum wmi_brightness_method - WMI method IDs
13 * @WMI_BRIGHTNESS_METHOD_LEVEL: Get/Set EC brightness level status
14 * @WMI_BRIGHTNESS_METHOD_SOURCE: Get/Set EC Brightness Source
15 */
16 enum wmi_brightness_method {
17 WMI_BRIGHTNESS_METHOD_LEVEL = 1,
18 WMI_BRIGHTNESS_METHOD_SOURCE = 2,
19 WMI_BRIGHTNESS_METHOD_MAX
20 };
21
22 /**
23 * enum wmi_brightness_mode - Operation mode for WMI-wrapped method
24 * @WMI_BRIGHTNESS_MODE_GET: Get the current brightness level/source.
25 * @WMI_BRIGHTNESS_MODE_SET: Set the brightness level.
26 * @WMI_BRIGHTNESS_MODE_GET_MAX_LEVEL: Get the maximum brightness level. This
27 * is only valid when the WMI method is
28 * %WMI_BRIGHTNESS_METHOD_LEVEL.
29 */
30 enum wmi_brightness_mode {
31 WMI_BRIGHTNESS_MODE_GET = 0,
32 WMI_BRIGHTNESS_MODE_SET = 1,
33 WMI_BRIGHTNESS_MODE_GET_MAX_LEVEL = 2,
34 WMI_BRIGHTNESS_MODE_MAX
35 };
36
37 /**
38 * enum wmi_brightness_source - Backlight brightness control source selection
39 * @WMI_BRIGHTNESS_SOURCE_GPU: Backlight brightness is controlled by the GPU.
40 * @WMI_BRIGHTNESS_SOURCE_EC: Backlight brightness is controlled by the
41 * system's Embedded Controller (EC).
42 * @WMI_BRIGHTNESS_SOURCE_AUX: Backlight brightness is controlled over the
43 * DisplayPort AUX channel.
44 */
45 enum wmi_brightness_source {
46 WMI_BRIGHTNESS_SOURCE_GPU = 1,
47 WMI_BRIGHTNESS_SOURCE_EC = 2,
48 WMI_BRIGHTNESS_SOURCE_AUX = 3,
49 WMI_BRIGHTNESS_SOURCE_MAX
50 };
51
52 /**
53 * struct wmi_brightness_args - arguments for the WMI-wrapped ACPI method
54 * @mode: Pass in an &enum wmi_brightness_mode value to select between
55 * getting or setting a value.
56 * @val: In parameter for value to set when using %WMI_BRIGHTNESS_MODE_SET
57 * mode. Not used in conjunction with %WMI_BRIGHTNESS_MODE_GET or
58 * %WMI_BRIGHTNESS_MODE_GET_MAX_LEVEL mode.
59 * @ret: Out parameter returning retrieved value when operating in
60 * %WMI_BRIGHTNESS_MODE_GET or %WMI_BRIGHTNESS_MODE_GET_MAX_LEVEL
61 * mode. Not used in %WMI_BRIGHTNESS_MODE_SET mode.
62 * @ignored: Padding; not used. The ACPI method expects a 24 byte params struct.
63 *
64 * This is the parameters structure for the WmiBrightnessNotify ACPI method as
65 * wrapped by WMI. The value passed in to @val or returned by @ret will be a
66 * brightness value when the WMI method ID is %WMI_BRIGHTNESS_METHOD_LEVEL, or
67 * an &enum wmi_brightness_source value with %WMI_BRIGHTNESS_METHOD_SOURCE.
68 */
69 struct wmi_brightness_args {
70 u32 mode;
71 u32 val;
72 u32 ret;
73 u32 ignored[3];
74 };
75
76 #endif
77
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