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
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/types.h>
24 #include <linux/input.h>
25 #include <linux/input/sparse-keymap.h>
26 #include <acpi/acpi_drivers.h>
27 #include <linux/acpi.h>
28 #include <linux/string.h>
30 MODULE_DESCRIPTION("WMI hotkeys driver for Dell All-In-One series");
31 MODULE_LICENSE("GPL");
33 #define EVENT_GUID1 "284A0E6B-380E-472A-921F-E52786257FB4"
34 #define EVENT_GUID2 "02314822-307C-4F66-BF0E-48AEAEB26CC8"
36 static const char *dell_wmi_aio_guids[] = {
42 MODULE_ALIAS("wmi:"EVENT_GUID1);
43 MODULE_ALIAS("wmi:"EVENT_GUID2);
45 static const struct key_entry dell_wmi_aio_keymap[] = {
46 { KE_KEY, 0xc0, { KEY_VOLUMEUP } },
47 { KE_KEY, 0xc1, { KEY_VOLUMEDOWN } },
51 static struct input_dev *dell_wmi_aio_input_dev;
53 static void dell_wmi_aio_notify(u32 value, void *context)
55 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
56 union acpi_object *obj;
59 status = wmi_get_event_data(value, &response);
60 if (status != AE_OK) {
61 pr_info("bad event status 0x%x\n", status);
65 obj = (union acpi_object *)response.pointer;
67 unsigned int scancode;
70 case ACPI_TYPE_INTEGER:
71 /* Most All-In-One correctly return integer scancode */
72 scancode = obj->integer.value;
73 sparse_keymap_report_event(dell_wmi_aio_input_dev,
76 case ACPI_TYPE_BUFFER:
77 /* Broken machines return the scancode in a buffer */
78 if (obj->buffer.pointer && obj->buffer.length > 0) {
79 scancode = obj->buffer.pointer[0];
80 sparse_keymap_report_event(
81 dell_wmi_aio_input_dev,
90 static int __init dell_wmi_aio_input_setup(void)
94 dell_wmi_aio_input_dev = input_allocate_device();
96 if (!dell_wmi_aio_input_dev)
99 dell_wmi_aio_input_dev->name = "Dell AIO WMI hotkeys";
100 dell_wmi_aio_input_dev->phys = "wmi/input0";
101 dell_wmi_aio_input_dev->id.bustype = BUS_HOST;
103 err = sparse_keymap_setup(dell_wmi_aio_input_dev,
104 dell_wmi_aio_keymap, NULL);
106 pr_err("Unable to setup input device keymap\n");
109 err = input_register_device(dell_wmi_aio_input_dev);
111 pr_info("Unable to register input device\n");
112 goto err_free_keymap;
117 sparse_keymap_free(dell_wmi_aio_input_dev);
119 input_free_device(dell_wmi_aio_input_dev);
123 static const char *dell_wmi_aio_find(void)
127 for (i = 0; dell_wmi_aio_guids[i] != NULL; i++)
128 if (wmi_has_guid(dell_wmi_aio_guids[i]))
129 return dell_wmi_aio_guids[i];
134 static int __init dell_wmi_aio_init(void)
139 guid = dell_wmi_aio_find();
141 pr_warning("No known WMI GUID found\n");
145 err = dell_wmi_aio_input_setup();
149 err = wmi_install_notify_handler(guid, dell_wmi_aio_notify, NULL);
151 pr_err("Unable to register notify handler - %d\n", err);
152 sparse_keymap_free(dell_wmi_aio_input_dev);
153 input_unregister_device(dell_wmi_aio_input_dev);
160 static void __exit dell_wmi_aio_exit(void)
164 guid = dell_wmi_aio_find();
165 wmi_remove_notify_handler(guid);
166 sparse_keymap_free(dell_wmi_aio_input_dev);
167 input_unregister_device(dell_wmi_aio_input_dev);
170 module_init(dell_wmi_aio_init);
171 module_exit(dell_wmi_aio_exit);