1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * toshiba_wmi.c - Toshiba WMI Hotkey Driver
4  *
5  * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
6  */
7 
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/acpi.h>
15 #include <linux/input.h>
16 #include <linux/input/sparse-keymap.h>
17 #include <linux/dmi.h>
18 
19 MODULE_AUTHOR("Azael Avalos");
20 MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
21 MODULE_LICENSE("GPL");
22 
23 #define WMI_EVENT_GUID	"59142400-C6A3-40FA-BADB-8A2652834100"
24 
25 MODULE_ALIAS("wmi:"WMI_EVENT_GUID);
26 
27 static struct input_dev *toshiba_wmi_input_dev;
28 
29 static const struct key_entry toshiba_wmi_keymap[] __initconst = {
30 	/* TODO: Add keymap values once found... */
31 	/*{ KE_KEY, 0x00, { KEY_ } },*/
32 	{ KE_END, 0 }
33 };
34 
35 static void toshiba_wmi_notify(u32 value, void *context)
36 {
37 	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
38 	union acpi_object *obj;
39 	acpi_status status;
40 
41 	status = wmi_get_event_data(value, &response);
42 	if (ACPI_FAILURE(status)) {
43 		pr_err("Bad event status 0x%x\n", status);
44 		return;
45 	}
46 
47 	obj = (union acpi_object *)response.pointer;
48 	if (!obj)
49 		return;
50 
51 	/* TODO: Add proper checks once we have data */
52 	pr_debug("Unknown event received, obj type %x\n", obj->type);
53 
54 	kfree(response.pointer);
55 }
56 
57 static const struct dmi_system_id toshiba_wmi_dmi_table[] __initconst = {
58 	{
59 		.ident = "Toshiba laptop",
60 		.matches = {
61 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
62 		},
63 	},
64 	{}
65 };
66 
67 static int __init toshiba_wmi_input_setup(void)
68 {
69 	acpi_status status;
70 	int err;
71 
72 	toshiba_wmi_input_dev = input_allocate_device();
73 	if (!toshiba_wmi_input_dev)
74 		return -ENOMEM;
75 
76 	toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
77 	toshiba_wmi_input_dev->phys = "wmi/input0";
78 	toshiba_wmi_input_dev->id.bustype = BUS_HOST;
79 
80 	err = sparse_keymap_setup(toshiba_wmi_input_dev,
81 				  toshiba_wmi_keymap, NULL);
82 	if (err)
83 		goto err_free_dev;
84 
85 	status = wmi_install_notify_handler(WMI_EVENT_GUID,
86 					    toshiba_wmi_notify, NULL);
87 	if (ACPI_FAILURE(status)) {
88 		err = -EIO;
89 		goto err_free_dev;
90 	}
91 
92 	err = input_register_device(toshiba_wmi_input_dev);
93 	if (err)
94 		goto err_remove_notifier;
95 
96 	return 0;
97 
98  err_remove_notifier:
99 	wmi_remove_notify_handler(WMI_EVENT_GUID);
100  err_free_dev:
101 	input_free_device(toshiba_wmi_input_dev);
102 	return err;
103 }
104 
105 static void toshiba_wmi_input_destroy(void)
106 {
107 	wmi_remove_notify_handler(WMI_EVENT_GUID);
108 	input_unregister_device(toshiba_wmi_input_dev);
109 }
110 
111 static int __init toshiba_wmi_init(void)
112 {
113 	int ret;
114 
115 	if (!wmi_has_guid(WMI_EVENT_GUID) ||
116 	    !dmi_check_system(toshiba_wmi_dmi_table))
117 		return -ENODEV;
118 
119 	ret = toshiba_wmi_input_setup();
120 	if (ret) {
121 		pr_err("Failed to setup input device\n");
122 		return ret;
123 	}
124 
125 	pr_info("Toshiba WMI Hotkey Driver\n");
126 
127 	return 0;
128 }
129 
130 static void __exit toshiba_wmi_exit(void)
131 {
132 	if (wmi_has_guid(WMI_EVENT_GUID))
133 		toshiba_wmi_input_destroy();
134 }
135 
136 module_init(toshiba_wmi_init);
137 module_exit(toshiba_wmi_exit);
138