2 * WMI hotkeys support for Dell All-In-One series
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.
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.
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
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
31 MODULE_DESCRIPTION("WMI hotkeys driver for Dell All-In-One series");
32 MODULE_LICENSE("GPL");
34 #define EVENT_GUID1 "284A0E6B-380E-472A-921F-E52786257FB4"
35 #define EVENT_GUID2 "02314822-307C-4F66-BF0E-48AEAEB26CC8"
37 struct dell_wmi_event {
39 /* 0x000: A hot key pressed or an event occurred
40 * 0x00F: A sequence of hot keys are pressed */
45 static const char *dell_wmi_aio_guids[] = {
51 MODULE_ALIAS("wmi:"EVENT_GUID1);
52 MODULE_ALIAS("wmi:"EVENT_GUID2);
54 static const struct key_entry dell_wmi_aio_keymap[] = {
55 { KE_KEY, 0xc0, { KEY_VOLUMEUP } },
56 { KE_KEY, 0xc1, { KEY_VOLUMEDOWN } },
57 { KE_KEY, 0xe030, { KEY_VOLUMEUP } },
58 { KE_KEY, 0xe02e, { KEY_VOLUMEDOWN } },
59 { KE_KEY, 0xe020, { KEY_MUTE } },
60 { KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } },
61 { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },
62 { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },
63 { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } },
67 static struct input_dev *dell_wmi_aio_input_dev;
70 * The new WMI event data format will follow the dell_wmi_event structure
71 * So, we will check if the buffer matches the format
73 static bool dell_wmi_aio_event_check(u8 *buffer, int length)
75 struct dell_wmi_event *event = (struct dell_wmi_event *)buffer;
77 if (event == NULL || length < 6)
80 if ((event->type == 0 || event->type == 0xf) &&
87 static void dell_wmi_aio_notify(u32 value, void *context)
89 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
90 union acpi_object *obj;
91 struct dell_wmi_event *event;
94 status = wmi_get_event_data(value, &response);
95 if (status != AE_OK) {
96 pr_info("bad event status 0x%x\n", status);
100 obj = (union acpi_object *)response.pointer;
102 unsigned int scancode = 0;
105 case ACPI_TYPE_INTEGER:
106 /* Most All-In-One correctly return integer scancode */
107 scancode = obj->integer.value;
108 sparse_keymap_report_event(dell_wmi_aio_input_dev,
111 case ACPI_TYPE_BUFFER:
112 if (dell_wmi_aio_event_check(obj->buffer.pointer,
113 obj->buffer.length)) {
114 event = (struct dell_wmi_event *)
116 scancode = event->event[0];
118 /* Broken machines return the scancode in a
120 if (obj->buffer.pointer &&
121 obj->buffer.length > 0)
122 scancode = obj->buffer.pointer[0];
125 sparse_keymap_report_event(
126 dell_wmi_aio_input_dev,
134 static int __init dell_wmi_aio_input_setup(void)
138 dell_wmi_aio_input_dev = input_allocate_device();
140 if (!dell_wmi_aio_input_dev)
143 dell_wmi_aio_input_dev->name = "Dell AIO WMI hotkeys";
144 dell_wmi_aio_input_dev->phys = "wmi/input0";
145 dell_wmi_aio_input_dev->id.bustype = BUS_HOST;
147 err = sparse_keymap_setup(dell_wmi_aio_input_dev,
148 dell_wmi_aio_keymap, NULL);
150 pr_err("Unable to setup input device keymap\n");
153 err = input_register_device(dell_wmi_aio_input_dev);
155 pr_info("Unable to register input device\n");
156 goto err_free_keymap;
161 sparse_keymap_free(dell_wmi_aio_input_dev);
163 input_free_device(dell_wmi_aio_input_dev);
167 static const char *dell_wmi_aio_find(void)
171 for (i = 0; dell_wmi_aio_guids[i] != NULL; i++)
172 if (wmi_has_guid(dell_wmi_aio_guids[i]))
173 return dell_wmi_aio_guids[i];
178 static int __init dell_wmi_aio_init(void)
183 guid = dell_wmi_aio_find();
185 pr_warn("No known WMI GUID found\n");
189 err = dell_wmi_aio_input_setup();
193 err = wmi_install_notify_handler(guid, dell_wmi_aio_notify, NULL);
195 pr_err("Unable to register notify handler - %d\n", err);
196 sparse_keymap_free(dell_wmi_aio_input_dev);
197 input_unregister_device(dell_wmi_aio_input_dev);
204 static void __exit dell_wmi_aio_exit(void)
208 guid = dell_wmi_aio_find();
209 wmi_remove_notify_handler(guid);
210 sparse_keymap_free(dell_wmi_aio_input_dev);
211 input_unregister_device(dell_wmi_aio_input_dev);
214 module_init(dell_wmi_aio_init);
215 module_exit(dell_wmi_aio_exit);