aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/dell-wmi.c
blob: fa9a2171cc134b733c837f89a4f1b80aeb0989ea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
/*
 * Dell WMI hotkeys
 *
 * Copyright (C) 2008 Red Hat <mjg@redhat.com>
 *
 * Portions based on wistron_btns.c:
 * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
 * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
 * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <acpi/acpi_drivers.h>
#include <linux/acpi.h>
#include <linux/string.h>
#include <linux/dmi.h>

MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
MODULE_LICENSE("GPL");

#define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"

static int acpi_video;

MODULE_ALIAS("wmi:"DELL_EVENT_GUID);

/*
 * Certain keys are flagged as KE_IGNORE. All of these are either
 * notifications (rather than requests for change) or are also sent
 * via the keyboard controller so should not be sent again.
 */

static const struct key_entry dell_wmi_legacy_keymap[] __initconst = {
	{ KE_IGNORE, 0x003a, { KEY_CAPSLOCK } },

	{ KE_KEY, 0xe045, { KEY_PROG1 } },
	{ KE_KEY, 0xe009, { KEY_EJECTCD } },

	/* These also contain the brightness level at offset 6 */
	{ KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },
	{ KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },

	/* Battery health status button */
	{ KE_KEY, 0xe007, { KEY_BATTERY } },

	/* This is actually for all radios. Although physically a
	 * switch, the notification does not provide an indication of
	 * state and so it should be reported as a key */
	{ KE_KEY, 0xe008, { KEY_WLAN } },

	/* The next device is at offset 6, the active devices are at
	   offset 8 and the attached devices at offset 10 */
	{ KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } },

	{ KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } },

	/* BIOS error detected */
	{ KE_IGNORE, 0xe00d, { KEY_RESERVED } },

	/* Wifi Catcher */
	{ KE_KEY, 0xe011, {KEY_PROG2 } },

	/* Ambient light sensor toggle */
	{ KE_IGNORE, 0xe013, { KEY_RESERVED } },

	{ KE_IGNORE, 0xe020, { KEY_MUTE } },

	/* Shortcut and audio panel keys */
	{ KE_IGNORE, 0xe025, { KEY_RESERVED } },
	{ KE_IGNORE, 0xe026, { KEY_RESERVED } },

	{ KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } },
	{ KE_IGNORE, 0xe030, { KEY_VOLUMEUP } },
	{ KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } },
	{ KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } },
	{ KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } },
	{ KE_IGNORE, 0xe045, { KEY_NUMLOCK } },
	{ KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } },
	{ KE_IGNORE, 0xe0f7, { KEY_MUTE } },
	{ KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } },
	{ KE_IGNORE, 0xe0f9, { KEY_VOLUMEUP } },
	{ KE_END, 0 }
};

static bool dell_new_hk_type;

struct dell_bios_keymap_entry {
	u16 scancode;
	u16 keycode;
};

struct dell_bios_hotkey_table {
	struct dmi_header header;
	struct dell_bios_keymap_entry keymap[];

};

static const struct dell_bios_hotkey_table *dell_bios_hotkey_table;

static const u16 bios_to_linux_keycode[256] __initconst = {

	KEY_MEDIA,	KEY_NEXTSONG,	KEY_PLAYPAUSE, KEY_PREVIOUSSONG,
	KEY_STOPCD,	KEY_UNKNOWN,	KEY_UNKNOWN,	KEY_UNKNOWN,
	KEY_WWW,	KEY_UNKNOWN,	KEY_VOLUMEDOWN, KEY_MUTE,
	KEY_VOLUMEUP,	KEY_UNKNOWN,	KEY_BATTERY,	KEY_EJECTCD,
	KEY_UNKNOWN,	KEY_SLEEP,	KEY_PROG1, KEY_BRIGHTNESSDOWN,
	KEY_BRIGHTNESSUP,	KEY_UNKNOWN,	KEY_KBDILLUMTOGGLE,
	KEY_UNKNOWN,	KEY_SWITCHVIDEOMODE,	KEY_UNKNOWN, KEY_UNKNOWN,
	KEY_SWITCHVIDEOMODE,	KEY_UNKNOWN,	KEY_UNKNOWN, KEY_PROG2,
	KEY_UNKNOWN, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	KEY_PROG3
};

static struct input_dev *dell_wmi_input_dev;

static void dell_wmi_notify(u32 value, void *context)
{
	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
	acpi_status status;

	status = wmi_get_event_data(value, &response);
	if (status != AE_OK) {
		pr_info("bad event status 0x%x\n", status);
		return;
	}

	obj = (union acpi_object *)response.pointer;

	if (obj && obj->type == ACPI_TYPE_BUFFER) {
		const struct key_entry *key;
		int reported_key;
		u16 *buffer_entry = (u16 *)obj->buffer.pointer;

		if (dell_new_hk_type && (buffer_entry[1] != 0x10)) {
			pr_info("Received unknown WMI event (0x%x)\n",
				buffer_entry[1]);
			kfree(obj);
			return;
		}

		if (dell_new_hk_type || buffer_entry[1] == 0x0)
			reported_key = (int)buffer_entry[2];
		else
			reported_key = (int)buffer_entry[1] & 0xffff;

		key = sparse_keymap_entry_from_scancode(dell_wmi_input_dev,
							reported_key);
		if (!key) {
			pr_info("Unknown key %x pressed\n", reported_key);
		} else if ((key->keycode == KEY_BRIGHTNESSUP ||
			    key->keycode == KEY_BRIGHTNESSDOWN) && acpi_video) {
			/* Don't report brightness notifications that will also
			 * come via ACPI */
			;
		} else {
			sparse_keymap_report_entry(dell_wmi_input_dev, key,
						   1, true);
		}
	}
	kfree(obj);
}

static const struct key_entry * __init dell_wmi_prepare_new_keymap(void)
{
	int hotkey_num = (dell_bios_hotkey_table->header.length - 4) /
				sizeof(struct dell_bios_keymap_entry);
	struct key_entry *keymap;
	int i;

	keymap = kcalloc(hotkey_num + 1, sizeof(struct key_entry), GFP_KERNEL);
	if (!keymap)
		return NULL;

	for (i = 0; i < hotkey_num; i++) {
		const struct dell_bios_keymap_entry *bios_entry =
					&dell_bios_hotkey_table->keymap[i];
		keymap[i].type = KE_KEY;
		keymap[i].code = bios_entry->scancode;
		keymap[i].keycode = bios_entry->keycode < 256 ?
				    bios_to_linux_keycode[bios_entry->keycode] :
				    KEY_RESERVED;
	}

	keymap[hotkey_num].type = KE_END;

	return keymap;
}

static int __init dell_wmi_input_setup(void)
{
	int err;

	dell_wmi_input_dev = input_allocate_device();
	if (!dell_wmi_input_dev)
		return -ENOMEM;

	dell_wmi_input_dev->name = "Dell WMI hotkeys";
	dell_wmi_input_dev->phys = "wmi/input0";
	dell_wmi_input_dev->id.bustype = BUS_HOST;

	if (dell_new_hk_type) {
		const struct key_entry *keymap = dell_wmi_prepare_new_keymap();
		if (!keymap) {
			err = -ENOMEM;
			goto err_free_dev;
		}

		err = sparse_keymap_setup(dell_wmi_input_dev, keymap, NULL);

		/*
		 * Sparse keymap library makes a copy of keymap so we
		 * don't need the original one that was allocated.
		 */
		kfree(keymap);
	} else {
		err = sparse_keymap_setup(dell_wmi_input_dev,
					  dell_wmi_legacy_keymap, NULL);
	}
	if (err)
		goto err_free_dev;

	err = input_register_device(dell_wmi_input_dev);
	if (err)
		goto err_free_keymap;

	return 0;

 err_free_keymap:
	sparse_keymap_free(dell_wmi_input_dev);
 err_free_dev:
	input_free_device(dell_wmi_input_dev);
	return err;
}

static void dell_wmi_input_destroy(void)
{
	sparse_keymap_free(dell_wmi_input_dev);
	input_unregister_device(dell_wmi_input_dev);
}

static void __init find_hk_type(const struct dmi_header *dm, void *dummy)
{
	if (dm->type == 0xb2 && dm->length > 6) {
		dell_new_hk_type = true;
		dell_bios_hotkey_table =
			container_of(dm, struct dell_bios_hotkey_table, header);
	}
}

static int __init dell_wmi_init(void)
{
	int err;
	acpi_status status;

	if (!wmi_has_guid(DELL_EVENT_GUID)) {
		pr_warn("No known WMI GUID found\n");
		return -ENODEV;
	}

	dmi_walk(find_hk_type, NULL);
	acpi_video = acpi_video_backlight_support();

	err = dell_wmi_input_setup();
	if (err)
		return err;

	status = wmi_install_notify_handler(DELL_EVENT_GUID,
					 dell_wmi_notify, NULL);
	if (ACPI_FAILURE(status)) {
		dell_wmi_input_destroy();
		pr_err("Unable to register notify handler - %d\n", status);
		return -ENODEV;
	}

	return 0;
}
module_init(dell_wmi_init);

static void __exit dell_wmi_exit(void)
{
	wmi_remove_notify_handler(DELL_EVENT_GUID);
	dell_wmi_input_destroy();
}
module_exit(dell_wmi_exit);