1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Alienware LEGACY WMI device driver
4 *
5 * Copyright (C) 2025 Kurt Borja <kuurtb@gmail.com>
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/wmi.h>
11 #include "alienware-wmi.h"
12
13 struct legacy_led_args {
14 struct color_platform colors;
15 u8 brightness;
16 u8 state;
17 } __packed;
18
19
20 /*
21 * Legacy WMI driver
22 */
legacy_wmi_update_led(struct alienfx_priv * priv,struct wmi_device * wdev,u8 location)23 static int legacy_wmi_update_led(struct alienfx_priv *priv,
24 struct wmi_device *wdev, u8 location)
25 {
26 struct legacy_led_args legacy_args = {
27 .colors = priv->colors[location],
28 .brightness = priv->global_brightness,
29 .state = 0,
30 };
31 struct acpi_buffer input;
32 acpi_status status;
33
34 if (legacy_args.state != LEGACY_RUNNING) {
35 legacy_args.state = priv->lighting_control_state;
36
37 input.length = sizeof(legacy_args);
38 input.pointer = &legacy_args;
39
40 status = wmi_evaluate_method(LEGACY_POWER_CONTROL_GUID, 0,
41 location + 1, &input, NULL);
42 if (ACPI_FAILURE(status))
43 return -EIO;
44
45 return 0;
46 }
47
48 return alienware_wmi_command(wdev, location + 1, &legacy_args,
49 sizeof(legacy_args), NULL);
50 }
51
legacy_wmi_update_brightness(struct alienfx_priv * priv,struct wmi_device * wdev,u8 brightness)52 static int legacy_wmi_update_brightness(struct alienfx_priv *priv,
53 struct wmi_device *wdev, u8 brightness)
54 {
55 return legacy_wmi_update_led(priv, wdev, 0);
56 }
57
legacy_wmi_probe(struct wmi_device * wdev,const void * context)58 static int legacy_wmi_probe(struct wmi_device *wdev, const void *context)
59 {
60 struct alienfx_platdata pdata = {
61 .wdev = wdev,
62 .ops = {
63 .upd_led = legacy_wmi_update_led,
64 .upd_brightness = legacy_wmi_update_brightness,
65 },
66 };
67
68 return alienware_alienfx_setup(&pdata);
69 }
70
71 static const struct wmi_device_id alienware_legacy_device_id_table[] = {
72 { LEGACY_CONTROL_GUID, NULL },
73 { },
74 };
75 MODULE_DEVICE_TABLE(wmi, alienware_legacy_device_id_table);
76
77 static struct wmi_driver alienware_legacy_wmi_driver = {
78 .driver = {
79 .name = "alienware-wmi-alienfx",
80 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
81 },
82 .id_table = alienware_legacy_device_id_table,
83 .probe = legacy_wmi_probe,
84 .no_singleton = true,
85 };
86
alienware_legacy_wmi_init(void)87 int __init alienware_legacy_wmi_init(void)
88 {
89 return wmi_driver_register(&alienware_legacy_wmi_driver);
90 }
91
alienware_legacy_wmi_exit(void)92 void __exit alienware_legacy_wmi_exit(void)
93 {
94 wmi_driver_unregister(&alienware_legacy_wmi_driver);
95 }
96