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