alienware-wmi-legacy.c

 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
13struct legacy_led_args {
14	struct color_platform colors;
15	u8 brightness;
16	u8 state;
17} __packed;
18
19
20/*
21 * Legacy WMI driver
22 */
23static 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
52static 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
58static 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
71static const struct wmi_device_id alienware_legacy_device_id_table[] = {
72	{ LEGACY_CONTROL_GUID, NULL },
73	{ },
74};
75MODULE_DEVICE_TABLE(wmi, alienware_legacy_device_id_table);
76
77static 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
87int __init alienware_legacy_wmi_init(void)
88{
89	return wmi_driver_register(&alienware_legacy_wmi_driver);
90}
91
92void __exit alienware_legacy_wmi_exit(void)
93{
94	wmi_driver_unregister(&alienware_legacy_wmi_driver);
95}