Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
820787fc CIK |
2 | /* |
3 | * WMI hotkeys support for Dell All-In-One series | |
820787fc | 4 | */ |
eb889524 | 5 | |
820787fc CIK |
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/input.h> | |
13 | #include <linux/input/sparse-keymap.h> | |
820787fc CIK |
14 | #include <linux/acpi.h> |
15 | #include <linux/string.h> | |
16 | ||
17 | MODULE_DESCRIPTION("WMI hotkeys driver for Dell All-In-One series"); | |
18 | MODULE_LICENSE("GPL"); | |
19 | ||
20 | #define EVENT_GUID1 "284A0E6B-380E-472A-921F-E52786257FB4" | |
21 | #define EVENT_GUID2 "02314822-307C-4F66-BF0E-48AEAEB26CC8" | |
22 | ||
5dd760b8 AK |
23 | struct dell_wmi_event { |
24 | u16 length; | |
25 | /* 0x000: A hot key pressed or an event occurred | |
26 | * 0x00F: A sequence of hot keys are pressed */ | |
27 | u16 type; | |
28 | u16 event[]; | |
29 | }; | |
30 | ||
820787fc CIK |
31 | static const char *dell_wmi_aio_guids[] = { |
32 | EVENT_GUID1, | |
33 | EVENT_GUID2, | |
34 | NULL | |
35 | }; | |
36 | ||
37 | MODULE_ALIAS("wmi:"EVENT_GUID1); | |
38 | MODULE_ALIAS("wmi:"EVENT_GUID2); | |
39 | ||
40 | static const struct key_entry dell_wmi_aio_keymap[] = { | |
41 | { KE_KEY, 0xc0, { KEY_VOLUMEUP } }, | |
42 | { KE_KEY, 0xc1, { KEY_VOLUMEDOWN } }, | |
5dd760b8 AK |
43 | { KE_KEY, 0xe030, { KEY_VOLUMEUP } }, |
44 | { KE_KEY, 0xe02e, { KEY_VOLUMEDOWN } }, | |
45 | { KE_KEY, 0xe020, { KEY_MUTE } }, | |
46 | { KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } }, | |
47 | { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } }, | |
48 | { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } }, | |
49 | { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } }, | |
820787fc CIK |
50 | { KE_END, 0 } |
51 | }; | |
52 | ||
53 | static struct input_dev *dell_wmi_aio_input_dev; | |
54 | ||
5dd760b8 AK |
55 | /* |
56 | * The new WMI event data format will follow the dell_wmi_event structure | |
57 | * So, we will check if the buffer matches the format | |
58 | */ | |
59 | static bool dell_wmi_aio_event_check(u8 *buffer, int length) | |
60 | { | |
61 | struct dell_wmi_event *event = (struct dell_wmi_event *)buffer; | |
62 | ||
63 | if (event == NULL || length < 6) | |
64 | return false; | |
65 | ||
66 | if ((event->type == 0 || event->type == 0xf) && | |
67 | event->length >= 2) | |
68 | return true; | |
69 | ||
70 | return false; | |
71 | } | |
72 | ||
820787fc CIK |
73 | static void dell_wmi_aio_notify(u32 value, void *context) |
74 | { | |
75 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
76 | union acpi_object *obj; | |
5dd760b8 | 77 | struct dell_wmi_event *event; |
820787fc CIK |
78 | acpi_status status; |
79 | ||
80 | status = wmi_get_event_data(value, &response); | |
81 | if (status != AE_OK) { | |
82 | pr_info("bad event status 0x%x\n", status); | |
83 | return; | |
84 | } | |
85 | ||
86 | obj = (union acpi_object *)response.pointer; | |
87 | if (obj) { | |
5dd760b8 | 88 | unsigned int scancode = 0; |
820787fc CIK |
89 | |
90 | switch (obj->type) { | |
91 | case ACPI_TYPE_INTEGER: | |
92 | /* Most All-In-One correctly return integer scancode */ | |
93 | scancode = obj->integer.value; | |
94 | sparse_keymap_report_event(dell_wmi_aio_input_dev, | |
95 | scancode, 1, true); | |
96 | break; | |
97 | case ACPI_TYPE_BUFFER: | |
5dd760b8 AK |
98 | if (dell_wmi_aio_event_check(obj->buffer.pointer, |
99 | obj->buffer.length)) { | |
100 | event = (struct dell_wmi_event *) | |
101 | obj->buffer.pointer; | |
102 | scancode = event->event[0]; | |
103 | } else { | |
104 | /* Broken machines return the scancode in a | |
105 | buffer */ | |
106 | if (obj->buffer.pointer && | |
107 | obj->buffer.length > 0) | |
108 | scancode = obj->buffer.pointer[0]; | |
109 | } | |
110 | if (scancode) | |
820787fc CIK |
111 | sparse_keymap_report_event( |
112 | dell_wmi_aio_input_dev, | |
113 | scancode, 1, true); | |
820787fc CIK |
114 | break; |
115 | } | |
116 | } | |
117 | kfree(obj); | |
118 | } | |
119 | ||
120 | static int __init dell_wmi_aio_input_setup(void) | |
121 | { | |
122 | int err; | |
123 | ||
124 | dell_wmi_aio_input_dev = input_allocate_device(); | |
125 | ||
126 | if (!dell_wmi_aio_input_dev) | |
127 | return -ENOMEM; | |
128 | ||
129 | dell_wmi_aio_input_dev->name = "Dell AIO WMI hotkeys"; | |
130 | dell_wmi_aio_input_dev->phys = "wmi/input0"; | |
131 | dell_wmi_aio_input_dev->id.bustype = BUS_HOST; | |
132 | ||
133 | err = sparse_keymap_setup(dell_wmi_aio_input_dev, | |
134 | dell_wmi_aio_keymap, NULL); | |
135 | if (err) { | |
136 | pr_err("Unable to setup input device keymap\n"); | |
137 | goto err_free_dev; | |
138 | } | |
139 | err = input_register_device(dell_wmi_aio_input_dev); | |
140 | if (err) { | |
141 | pr_info("Unable to register input device\n"); | |
469b0170 | 142 | goto err_free_dev; |
820787fc CIK |
143 | } |
144 | return 0; | |
145 | ||
820787fc CIK |
146 | err_free_dev: |
147 | input_free_device(dell_wmi_aio_input_dev); | |
148 | return err; | |
149 | } | |
150 | ||
151 | static const char *dell_wmi_aio_find(void) | |
152 | { | |
153 | int i; | |
154 | ||
155 | for (i = 0; dell_wmi_aio_guids[i] != NULL; i++) | |
156 | if (wmi_has_guid(dell_wmi_aio_guids[i])) | |
157 | return dell_wmi_aio_guids[i]; | |
158 | ||
159 | return NULL; | |
160 | } | |
161 | ||
162 | static int __init dell_wmi_aio_init(void) | |
163 | { | |
164 | int err; | |
165 | const char *guid; | |
166 | ||
167 | guid = dell_wmi_aio_find(); | |
168 | if (!guid) { | |
eb889524 | 169 | pr_warn("No known WMI GUID found\n"); |
820787fc CIK |
170 | return -ENXIO; |
171 | } | |
172 | ||
173 | err = dell_wmi_aio_input_setup(); | |
174 | if (err) | |
175 | return err; | |
176 | ||
177 | err = wmi_install_notify_handler(guid, dell_wmi_aio_notify, NULL); | |
178 | if (err) { | |
179 | pr_err("Unable to register notify handler - %d\n", err); | |
820787fc CIK |
180 | input_unregister_device(dell_wmi_aio_input_dev); |
181 | return err; | |
182 | } | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static void __exit dell_wmi_aio_exit(void) | |
188 | { | |
189 | const char *guid; | |
190 | ||
191 | guid = dell_wmi_aio_find(); | |
192 | wmi_remove_notify_handler(guid); | |
820787fc CIK |
193 | input_unregister_device(dell_wmi_aio_input_dev); |
194 | } | |
195 | ||
196 | module_init(dell_wmi_aio_init); | |
197 | module_exit(dell_wmi_aio_exit); |