1 /*
2 * WMI hotkeys support for Dell All-In-One series
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/types.h>
25 #include <linux/input.h>
26 #include <linux/input/sparse-keymap.h>
27 #include <acpi/acpi_drivers.h>
28 #include <linux/acpi.h>
29 #include <linux/string.h>
30
31 MODULE_DESCRIPTION("WMI hotkeys driver for Dell All-In-One series");
32 MODULE_LICENSE("GPL");
33
34 #define EVENT_GUID1 "284A0E6B-380E-472A-921F-E52786257FB4"
35 #define EVENT_GUID2 "02314822-307C-4F66-BF0E-48AEAEB26CC8"
36
37 static const char *dell_wmi_aio_guids[] = {
38 EVENT_GUID1,
39 EVENT_GUID2,
40 NULL
41 };
42
43 MODULE_ALIAS("wmi:"EVENT_GUID1);
44 MODULE_ALIAS("wmi:"EVENT_GUID2);
45
46 static const struct key_entry dell_wmi_aio_keymap[] = {
47 { KE_KEY, 0xc0, { KEY_VOLUMEUP } },
48 { KE_KEY, 0xc1, { KEY_VOLUMEDOWN } },
49 { KE_END, 0 }
50 };
51
52 static struct input_dev *dell_wmi_aio_input_dev;
53
dell_wmi_aio_notify(u32 value,void * context)54 static void dell_wmi_aio_notify(u32 value, void *context)
55 {
56 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
57 union acpi_object *obj;
58 acpi_status status;
59
60 status = wmi_get_event_data(value, &response);
61 if (status != AE_OK) {
62 pr_info("bad event status 0x%x\n", status);
63 return;
64 }
65
66 obj = (union acpi_object *)response.pointer;
67 if (obj) {
68 unsigned int scancode;
69
70 switch (obj->type) {
71 case ACPI_TYPE_INTEGER:
72 /* Most All-In-One correctly return integer scancode */
73 scancode = obj->integer.value;
74 sparse_keymap_report_event(dell_wmi_aio_input_dev,
75 scancode, 1, true);
76 break;
77 case ACPI_TYPE_BUFFER:
78 /* Broken machines return the scancode in a buffer */
79 if (obj->buffer.pointer && obj->buffer.length > 0) {
80 scancode = obj->buffer.pointer[0];
81 sparse_keymap_report_event(
82 dell_wmi_aio_input_dev,
83 scancode, 1, true);
84 }
85 break;
86 }
87 }
88 kfree(obj);
89 }
90
dell_wmi_aio_input_setup(void)91 static int __init dell_wmi_aio_input_setup(void)
92 {
93 int err;
94
95 dell_wmi_aio_input_dev = input_allocate_device();
96
97 if (!dell_wmi_aio_input_dev)
98 return -ENOMEM;
99
100 dell_wmi_aio_input_dev->name = "Dell AIO WMI hotkeys";
101 dell_wmi_aio_input_dev->phys = "wmi/input0";
102 dell_wmi_aio_input_dev->id.bustype = BUS_HOST;
103
104 err = sparse_keymap_setup(dell_wmi_aio_input_dev,
105 dell_wmi_aio_keymap, NULL);
106 if (err) {
107 pr_err("Unable to setup input device keymap\n");
108 goto err_free_dev;
109 }
110 err = input_register_device(dell_wmi_aio_input_dev);
111 if (err) {
112 pr_info("Unable to register input device\n");
113 goto err_free_keymap;
114 }
115 return 0;
116
117 err_free_keymap:
118 sparse_keymap_free(dell_wmi_aio_input_dev);
119 err_free_dev:
120 input_free_device(dell_wmi_aio_input_dev);
121 return err;
122 }
123
dell_wmi_aio_find(void)124 static const char *dell_wmi_aio_find(void)
125 {
126 int i;
127
128 for (i = 0; dell_wmi_aio_guids[i] != NULL; i++)
129 if (wmi_has_guid(dell_wmi_aio_guids[i]))
130 return dell_wmi_aio_guids[i];
131
132 return NULL;
133 }
134
dell_wmi_aio_init(void)135 static int __init dell_wmi_aio_init(void)
136 {
137 int err;
138 const char *guid;
139
140 guid = dell_wmi_aio_find();
141 if (!guid) {
142 pr_warn("No known WMI GUID found\n");
143 return -ENXIO;
144 }
145
146 err = dell_wmi_aio_input_setup();
147 if (err)
148 return err;
149
150 err = wmi_install_notify_handler(guid, dell_wmi_aio_notify, NULL);
151 if (err) {
152 pr_err("Unable to register notify handler - %d\n", err);
153 sparse_keymap_free(dell_wmi_aio_input_dev);
154 input_unregister_device(dell_wmi_aio_input_dev);
155 return err;
156 }
157
158 return 0;
159 }
160
dell_wmi_aio_exit(void)161 static void __exit dell_wmi_aio_exit(void)
162 {
163 const char *guid;
164
165 guid = dell_wmi_aio_find();
166 wmi_remove_notify_handler(guid);
167 sparse_keymap_free(dell_wmi_aio_input_dev);
168 input_unregister_device(dell_wmi_aio_input_dev);
169 }
170
171 module_init(dell_wmi_aio_init);
172 module_exit(dell_wmi_aio_exit);
173