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1/*
2 * Dell WMI hotkeys
3 *
4 * Copyright (C) 2008 Red Hat <mjg@redhat.com>
5 * Copyright (C) 2014-2015 Pali Rohár <pali.rohar@gmail.com>
6 *
7 * Portions based on wistron_btns.c:
8 * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
9 * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
10 * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 */
26
27#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28
29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/slab.h>
33#include <linux/types.h>
34#include <linux/input.h>
35#include <linux/input/sparse-keymap.h>
36#include <linux/acpi.h>
37#include <linux/string.h>
38#include <linux/dmi.h>
39#include <linux/wmi.h>
40#include <acpi/video.h>
41#include "dell-smbios.h"
42#include "dell-wmi-descriptor.h"
43
44MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
45MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
46MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
47MODULE_LICENSE("GPL");
48
49#define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
50
51static bool wmi_requires_smbios_request;
52
53MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
54
55struct dell_wmi_priv {
56 struct input_dev *input_dev;
57 u32 interface_version;
58};
59
60static int __init dmi_matched(const struct dmi_system_id *dmi)
61{
62 wmi_requires_smbios_request = 1;
63 return 1;
64}
65
66static const struct dmi_system_id dell_wmi_smbios_list[] __initconst = {
67 {
68 .callback = dmi_matched,
69 .ident = "Dell Inspiron M5110",
70 .matches = {
71 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
72 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
73 },
74 },
75 {
76 .callback = dmi_matched,
77 .ident = "Dell Vostro V131",
78 .matches = {
79 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
80 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
81 },
82 },
83 { }
84};
85
86/*
87 * Keymap for WMI events of type 0x0000
88 *
89 * Certain keys are flagged as KE_IGNORE. All of these are either
90 * notifications (rather than requests for change) or are also sent
91 * via the keyboard controller so should not be sent again.
92 */
93static const struct key_entry dell_wmi_keymap_type_0000[] = {
94 { KE_IGNORE, 0x003a, { KEY_CAPSLOCK } },
95
96 /* Key code is followed by brightness level */
97 { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },
98 { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },
99
100 /* Battery health status button */
101 { KE_KEY, 0xe007, { KEY_BATTERY } },
102
103 /* Radio devices state change, key code is followed by other values */
104 { KE_IGNORE, 0xe008, { KEY_RFKILL } },
105
106 { KE_KEY, 0xe009, { KEY_EJECTCD } },
107
108 /* Key code is followed by: next, active and attached devices */
109 { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } },
110
111 /* Key code is followed by keyboard illumination level */
112 { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } },
113
114 /* BIOS error detected */
115 { KE_IGNORE, 0xe00d, { KEY_RESERVED } },
116
117 /* Battery was removed or inserted */
118 { KE_IGNORE, 0xe00e, { KEY_RESERVED } },
119
120 /* Wifi Catcher */
121 { KE_KEY, 0xe011, { KEY_WLAN } },
122
123 /* Ambient light sensor toggle */
124 { KE_IGNORE, 0xe013, { KEY_RESERVED } },
125
126 { KE_IGNORE, 0xe020, { KEY_MUTE } },
127
128 /* Unknown, defined in ACPI DSDT */
129 /* { KE_IGNORE, 0xe023, { KEY_RESERVED } }, */
130
131 /* Untested, Dell Instant Launch key on Inspiron 7520 */
132 /* { KE_IGNORE, 0xe024, { KEY_RESERVED } }, */
133
134 /* Dell Instant Launch key */
135 { KE_KEY, 0xe025, { KEY_PROG4 } },
136
137 /* Audio panel key */
138 { KE_IGNORE, 0xe026, { KEY_RESERVED } },
139
140 /* LCD Display On/Off Control key */
141 { KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } },
142
143 /* Untested, Multimedia key on Dell Vostro 3560 */
144 /* { KE_IGNORE, 0xe028, { KEY_RESERVED } }, */
145
146 /* Dell Instant Launch key */
147 { KE_KEY, 0xe029, { KEY_PROG4 } },
148
149 /* Untested, Windows Mobility Center button on Inspiron 7520 */
150 /* { KE_IGNORE, 0xe02a, { KEY_RESERVED } }, */
151
152 /* Unknown, defined in ACPI DSDT */
153 /* { KE_IGNORE, 0xe02b, { KEY_RESERVED } }, */
154
155 /* Untested, Dell Audio With Preset Switch button on Inspiron 7520 */
156 /* { KE_IGNORE, 0xe02c, { KEY_RESERVED } }, */
157
158 { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } },
159 { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } },
160 { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } },
161 { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } },
162 { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } },
163
164 /* NIC Link is Up */
165 { KE_IGNORE, 0xe043, { KEY_RESERVED } },
166
167 /* NIC Link is Down */
168 { KE_IGNORE, 0xe044, { KEY_RESERVED } },
169
170 /*
171 * This entry is very suspicious!
172 * Originally Matthew Garrett created this dell-wmi driver specially for
173 * "button with a picture of a battery" which has event code 0xe045.
174 * Later Mario Limonciello from Dell told us that event code 0xe045 is
175 * reported by Num Lock and should be ignored because key is send also
176 * by keyboard controller.
177 * So for now we will ignore this event to prevent potential double
178 * Num Lock key press.
179 */
180 { KE_IGNORE, 0xe045, { KEY_NUMLOCK } },
181
182 /* Scroll lock and also going to tablet mode on portable devices */
183 { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } },
184
185 /* Untested, going from tablet mode on portable devices */
186 /* { KE_IGNORE, 0xe047, { KEY_RESERVED } }, */
187
188 /* Dell Support Center key */
189 { KE_IGNORE, 0xe06e, { KEY_RESERVED } },
190
191 { KE_IGNORE, 0xe0f7, { KEY_MUTE } },
192 { KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } },
193 { KE_IGNORE, 0xe0f9, { KEY_VOLUMEUP } },
194};
195
196struct dell_bios_keymap_entry {
197 u16 scancode;
198 u16 keycode;
199};
200
201struct dell_bios_hotkey_table {
202 struct dmi_header header;
203 struct dell_bios_keymap_entry keymap[];
204
205};
206
207struct dell_dmi_results {
208 int err;
209 int keymap_size;
210 struct key_entry *keymap;
211};
212
213/* Uninitialized entries here are KEY_RESERVED == 0. */
214static const u16 bios_to_linux_keycode[256] = {
215 [0] = KEY_MEDIA,
216 [1] = KEY_NEXTSONG,
217 [2] = KEY_PLAYPAUSE,
218 [3] = KEY_PREVIOUSSONG,
219 [4] = KEY_STOPCD,
220 [5] = KEY_UNKNOWN,
221 [6] = KEY_UNKNOWN,
222 [7] = KEY_UNKNOWN,
223 [8] = KEY_WWW,
224 [9] = KEY_UNKNOWN,
225 [10] = KEY_VOLUMEDOWN,
226 [11] = KEY_MUTE,
227 [12] = KEY_VOLUMEUP,
228 [13] = KEY_UNKNOWN,
229 [14] = KEY_BATTERY,
230 [15] = KEY_EJECTCD,
231 [16] = KEY_UNKNOWN,
232 [17] = KEY_SLEEP,
233 [18] = KEY_PROG1,
234 [19] = KEY_BRIGHTNESSDOWN,
235 [20] = KEY_BRIGHTNESSUP,
236 [21] = KEY_UNKNOWN,
237 [22] = KEY_KBDILLUMTOGGLE,
238 [23] = KEY_UNKNOWN,
239 [24] = KEY_SWITCHVIDEOMODE,
240 [25] = KEY_UNKNOWN,
241 [26] = KEY_UNKNOWN,
242 [27] = KEY_SWITCHVIDEOMODE,
243 [28] = KEY_UNKNOWN,
244 [29] = KEY_UNKNOWN,
245 [30] = KEY_PROG2,
246 [31] = KEY_UNKNOWN,
247 [32] = KEY_UNKNOWN,
248 [33] = KEY_UNKNOWN,
249 [34] = KEY_UNKNOWN,
250 [35] = KEY_UNKNOWN,
251 [36] = KEY_UNKNOWN,
252 [37] = KEY_UNKNOWN,
253 [38] = KEY_MICMUTE,
254 [255] = KEY_PROG3,
255};
256
257/*
258 * Keymap for WMI events of type 0x0010
259 *
260 * These are applied if the 0xB2 DMI hotkey table is present and doesn't
261 * override them.
262 */
263static const struct key_entry dell_wmi_keymap_type_0010[] = {
264 /* Mic mute */
265 { KE_KEY, 0x150, { KEY_MICMUTE } },
266
267 /* Fn-lock */
268 { KE_IGNORE, 0x151, { KEY_RESERVED } },
269
270 /* Change keyboard illumination */
271 { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } },
272
273 /*
274 * Radio disable (notify only -- there is no model for which the
275 * WMI event is supposed to trigger an action).
276 */
277 { KE_IGNORE, 0x153, { KEY_RFKILL } },
278
279 /* RGB keyboard backlight control */
280 { KE_IGNORE, 0x154, { KEY_RESERVED } },
281
282 /*
283 * Stealth mode toggle. This will "disable all lights and sounds".
284 * The action is performed by the BIOS and EC; the WMI event is just
285 * a notification. On the XPS 13 9350, this is Fn+F7, and there's
286 * a BIOS setting to enable and disable the hotkey.
287 */
288 { KE_IGNORE, 0x155, { KEY_RESERVED } },
289
290 /* Rugged magnetic dock attach/detach events */
291 { KE_IGNORE, 0x156, { KEY_RESERVED } },
292 { KE_IGNORE, 0x157, { KEY_RESERVED } },
293
294 /* Rugged programmable (P1/P2/P3 keys) */
295 { KE_KEY, 0x850, { KEY_PROG1 } },
296 { KE_KEY, 0x851, { KEY_PROG2 } },
297 { KE_KEY, 0x852, { KEY_PROG3 } },
298
299};
300
301/*
302 * Keymap for WMI events of type 0x0011
303 */
304static const struct key_entry dell_wmi_keymap_type_0011[] = {
305 /* Battery unplugged */
306 { KE_IGNORE, 0xfff0, { KEY_RESERVED } },
307
308 /* Battery inserted */
309 { KE_IGNORE, 0xfff1, { KEY_RESERVED } },
310
311 /* Keyboard backlight level changed */
312 { KE_IGNORE, 0x01e1, { KEY_RESERVED } },
313 { KE_IGNORE, 0x02ea, { KEY_RESERVED } },
314 { KE_IGNORE, 0x02eb, { KEY_RESERVED } },
315 { KE_IGNORE, 0x02ec, { KEY_RESERVED } },
316 { KE_IGNORE, 0x02f6, { KEY_RESERVED } },
317};
318
319static void dell_wmi_process_key(struct wmi_device *wdev, int type, int code)
320{
321 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
322 const struct key_entry *key;
323
324 key = sparse_keymap_entry_from_scancode(priv->input_dev,
325 (type << 16) | code);
326 if (!key) {
327 pr_info("Unknown key with type 0x%04x and code 0x%04x pressed\n",
328 type, code);
329 return;
330 }
331
332 pr_debug("Key with type 0x%04x and code 0x%04x pressed\n", type, code);
333
334 /* Don't report brightness notifications that will also come via ACPI */
335 if ((key->keycode == KEY_BRIGHTNESSUP ||
336 key->keycode == KEY_BRIGHTNESSDOWN) &&
337 acpi_video_handles_brightness_key_presses())
338 return;
339
340 if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request)
341 return;
342
343 if (key->keycode == KEY_KBDILLUMTOGGLE)
344 dell_laptop_call_notifier(
345 DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED, NULL);
346
347 sparse_keymap_report_entry(priv->input_dev, key, 1, true);
348}
349
350static void dell_wmi_notify(struct wmi_device *wdev,
351 union acpi_object *obj)
352{
353 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
354 u16 *buffer_entry, *buffer_end;
355 acpi_size buffer_size;
356 int len, i;
357
358 if (obj->type != ACPI_TYPE_BUFFER) {
359 pr_warn("bad response type %x\n", obj->type);
360 return;
361 }
362
363 pr_debug("Received WMI event (%*ph)\n",
364 obj->buffer.length, obj->buffer.pointer);
365
366 buffer_entry = (u16 *)obj->buffer.pointer;
367 buffer_size = obj->buffer.length/2;
368 buffer_end = buffer_entry + buffer_size;
369
370 /*
371 * BIOS/ACPI on devices with WMI interface version 0 does not clear
372 * buffer before filling it. So next time when BIOS/ACPI send WMI event
373 * which is smaller as previous then it contains garbage in buffer from
374 * previous event.
375 *
376 * BIOS/ACPI on devices with WMI interface version 1 clears buffer and
377 * sometimes send more events in buffer at one call.
378 *
379 * So to prevent reading garbage from buffer we will process only first
380 * one event on devices with WMI interface version 0.
381 */
382 if (priv->interface_version == 0 && buffer_entry < buffer_end)
383 if (buffer_end > buffer_entry + buffer_entry[0] + 1)
384 buffer_end = buffer_entry + buffer_entry[0] + 1;
385
386 while (buffer_entry < buffer_end) {
387
388 len = buffer_entry[0];
389 if (len == 0)
390 break;
391
392 len++;
393
394 if (buffer_entry + len > buffer_end) {
395 pr_warn("Invalid length of WMI event\n");
396 break;
397 }
398
399 pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry);
400
401 switch (buffer_entry[1]) {
402 case 0x0000: /* One key pressed or event occurred */
403 if (len > 2)
404 dell_wmi_process_key(wdev, 0x0000,
405 buffer_entry[2]);
406 /* Other entries could contain additional information */
407 break;
408 case 0x0010: /* Sequence of keys pressed */
409 case 0x0011: /* Sequence of events occurred */
410 for (i = 2; i < len; ++i)
411 dell_wmi_process_key(wdev, buffer_entry[1],
412 buffer_entry[i]);
413 break;
414 default: /* Unknown event */
415 pr_info("Unknown WMI event type 0x%x\n",
416 (int)buffer_entry[1]);
417 break;
418 }
419
420 buffer_entry += len;
421
422 }
423
424}
425
426static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len)
427{
428 int i;
429
430 for (i = 0; i < len; i++)
431 if (keymap[i].code == scancode)
432 return true;
433
434 return false;
435}
436
437static void handle_dmi_entry(const struct dmi_header *dm, void *opaque)
438{
439 struct dell_dmi_results *results = opaque;
440 struct dell_bios_hotkey_table *table;
441 int hotkey_num, i, pos = 0;
442 struct key_entry *keymap;
443
444 if (results->err || results->keymap)
445 return; /* We already found the hotkey table. */
446
447 /* The Dell hotkey table is type 0xB2. Scan until we find it. */
448 if (dm->type != 0xb2)
449 return;
450
451 table = container_of(dm, struct dell_bios_hotkey_table, header);
452
453 hotkey_num = (table->header.length -
454 sizeof(struct dell_bios_hotkey_table)) /
455 sizeof(struct dell_bios_keymap_entry);
456 if (hotkey_num < 1) {
457 /*
458 * Historically, dell-wmi would ignore a DMI entry of
459 * fewer than 7 bytes. Sizes between 4 and 8 bytes are
460 * nonsensical (both the header and all entries are 4
461 * bytes), so we approximate the old behavior by
462 * ignoring tables with fewer than one entry.
463 */
464 return;
465 }
466
467 keymap = kcalloc(hotkey_num, sizeof(struct key_entry), GFP_KERNEL);
468 if (!keymap) {
469 results->err = -ENOMEM;
470 return;
471 }
472
473 for (i = 0; i < hotkey_num; i++) {
474 const struct dell_bios_keymap_entry *bios_entry =
475 &table->keymap[i];
476
477 /* Uninitialized entries are 0 aka KEY_RESERVED. */
478 u16 keycode = (bios_entry->keycode <
479 ARRAY_SIZE(bios_to_linux_keycode)) ?
480 bios_to_linux_keycode[bios_entry->keycode] :
481 KEY_RESERVED;
482
483 /*
484 * Log if we find an entry in the DMI table that we don't
485 * understand. If this happens, we should figure out what
486 * the entry means and add it to bios_to_linux_keycode.
487 */
488 if (keycode == KEY_RESERVED) {
489 pr_info("firmware scancode 0x%x maps to unrecognized keycode 0x%x\n",
490 bios_entry->scancode, bios_entry->keycode);
491 continue;
492 }
493
494 if (keycode == KEY_KBDILLUMTOGGLE)
495 keymap[pos].type = KE_IGNORE;
496 else
497 keymap[pos].type = KE_KEY;
498 keymap[pos].code = bios_entry->scancode;
499 keymap[pos].keycode = keycode;
500
501 pos++;
502 }
503
504 results->keymap = keymap;
505 results->keymap_size = pos;
506}
507
508static int dell_wmi_input_setup(struct wmi_device *wdev)
509{
510 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
511 struct dell_dmi_results dmi_results = {};
512 struct key_entry *keymap;
513 int err, i, pos = 0;
514
515 priv->input_dev = input_allocate_device();
516 if (!priv->input_dev)
517 return -ENOMEM;
518
519 priv->input_dev->name = "Dell WMI hotkeys";
520 priv->input_dev->id.bustype = BUS_HOST;
521 priv->input_dev->dev.parent = &wdev->dev;
522
523 if (dmi_walk(handle_dmi_entry, &dmi_results)) {
524 /*
525 * Historically, dell-wmi ignored dmi_walk errors. A failure
526 * is certainly surprising, but it probably just indicates
527 * a very old laptop.
528 */
529 pr_warn("no DMI; using the old-style hotkey interface\n");
530 }
531
532 if (dmi_results.err) {
533 err = dmi_results.err;
534 goto err_free_dev;
535 }
536
537 keymap = kcalloc(dmi_results.keymap_size +
538 ARRAY_SIZE(dell_wmi_keymap_type_0000) +
539 ARRAY_SIZE(dell_wmi_keymap_type_0010) +
540 ARRAY_SIZE(dell_wmi_keymap_type_0011) +
541 1,
542 sizeof(struct key_entry), GFP_KERNEL);
543 if (!keymap) {
544 kfree(dmi_results.keymap);
545 err = -ENOMEM;
546 goto err_free_dev;
547 }
548
549 /* Append table with events of type 0x0010 which comes from DMI */
550 for (i = 0; i < dmi_results.keymap_size; i++) {
551 keymap[pos] = dmi_results.keymap[i];
552 keymap[pos].code |= (0x0010 << 16);
553 pos++;
554 }
555
556 kfree(dmi_results.keymap);
557
558 /* Append table with extra events of type 0x0010 which are not in DMI */
559 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0010); i++) {
560 const struct key_entry *entry = &dell_wmi_keymap_type_0010[i];
561
562 /*
563 * Check if we've already found this scancode. This takes
564 * quadratic time, but it doesn't matter unless the list
565 * of extra keys gets very long.
566 */
567 if (dmi_results.keymap_size &&
568 have_scancode(entry->code | (0x0010 << 16),
569 keymap, dmi_results.keymap_size)
570 )
571 continue;
572
573 keymap[pos] = *entry;
574 keymap[pos].code |= (0x0010 << 16);
575 pos++;
576 }
577
578 /* Append table with events of type 0x0011 */
579 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0011); i++) {
580 keymap[pos] = dell_wmi_keymap_type_0011[i];
581 keymap[pos].code |= (0x0011 << 16);
582 pos++;
583 }
584
585 /*
586 * Now append also table with "legacy" events of type 0x0000. Some of
587 * them are reported also on laptops which have scancodes in DMI.
588 */
589 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0000); i++) {
590 keymap[pos] = dell_wmi_keymap_type_0000[i];
591 pos++;
592 }
593
594 keymap[pos].type = KE_END;
595
596 err = sparse_keymap_setup(priv->input_dev, keymap, NULL);
597 /*
598 * Sparse keymap library makes a copy of keymap so we don't need the
599 * original one that was allocated.
600 */
601 kfree(keymap);
602 if (err)
603 goto err_free_dev;
604
605 err = input_register_device(priv->input_dev);
606 if (err)
607 goto err_free_dev;
608
609 return 0;
610
611 err_free_dev:
612 input_free_device(priv->input_dev);
613 return err;
614}
615
616static void dell_wmi_input_destroy(struct wmi_device *wdev)
617{
618 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
619
620 input_unregister_device(priv->input_dev);
621}
622
623/*
624 * According to Dell SMBIOS documentation:
625 *
626 * 17 3 Application Program Registration
627 *
628 * cbArg1 Application ID 1 = 0x00010000
629 * cbArg2 Application ID 2
630 * QUICKSET/DCP = 0x51534554 "QSET"
631 * ALS Driver = 0x416c7353 "AlsS"
632 * Latitude ON = 0x4c6f6e52 "LonR"
633 * cbArg3 Application version or revision number
634 * cbArg4 0 = Unregister application
635 * 1 = Register application
636 * cbRes1 Standard return codes (0, -1, -2)
637 */
638
639static int dell_wmi_events_set_enabled(bool enable)
640{
641 struct calling_interface_buffer *buffer;
642 int ret;
643
644 buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);
645 if (!buffer)
646 return -ENOMEM;
647 buffer->cmd_class = CLASS_INFO;
648 buffer->cmd_select = SELECT_APP_REGISTRATION;
649 buffer->input[0] = 0x10000;
650 buffer->input[1] = 0x51534554;
651 buffer->input[3] = enable;
652 ret = dell_smbios_call(buffer);
653 if (ret == 0)
654 ret = buffer->output[0];
655 kfree(buffer);
656
657 return dell_smbios_error(ret);
658}
659
660static int dell_wmi_probe(struct wmi_device *wdev)
661{
662 struct dell_wmi_priv *priv;
663 int ret;
664
665 ret = dell_wmi_get_descriptor_valid();
666 if (ret)
667 return ret;
668
669 priv = devm_kzalloc(
670 &wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL);
671 if (!priv)
672 return -ENOMEM;
673 dev_set_drvdata(&wdev->dev, priv);
674
675 if (!dell_wmi_get_interface_version(&priv->interface_version))
676 return -EPROBE_DEFER;
677
678 return dell_wmi_input_setup(wdev);
679}
680
681static int dell_wmi_remove(struct wmi_device *wdev)
682{
683 dell_wmi_input_destroy(wdev);
684 return 0;
685}
686static const struct wmi_device_id dell_wmi_id_table[] = {
687 { .guid_string = DELL_EVENT_GUID },
688 { },
689};
690
691static struct wmi_driver dell_wmi_driver = {
692 .driver = {
693 .name = "dell-wmi",
694 },
695 .id_table = dell_wmi_id_table,
696 .probe = dell_wmi_probe,
697 .remove = dell_wmi_remove,
698 .notify = dell_wmi_notify,
699};
700
701static int __init dell_wmi_init(void)
702{
703 int err;
704
705 dmi_check_system(dell_wmi_smbios_list);
706
707 if (wmi_requires_smbios_request) {
708 err = dell_wmi_events_set_enabled(true);
709 if (err) {
710 pr_err("Failed to enable WMI events\n");
711 return err;
712 }
713 }
714
715 return wmi_driver_register(&dell_wmi_driver);
716}
717late_initcall(dell_wmi_init);
718
719static void __exit dell_wmi_exit(void)
720{
721 if (wmi_requires_smbios_request)
722 dell_wmi_events_set_enabled(false);
723
724 wmi_driver_unregister(&dell_wmi_driver);
725}
726module_exit(dell_wmi_exit);