1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Dell WMI hotkeys
4 *
5 * Copyright (C) 2008 Red Hat <mjg@redhat.com>
6 * Copyright (C) 2014-2015 Pali Rohár <pali.rohar@gmail.com>
7 *
8 * Portions based on wistron_btns.c:
9 * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
10 * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
11 * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
12 */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/slab.h>
20 #include <linux/types.h>
21 #include <linux/input.h>
22 #include <linux/input/sparse-keymap.h>
23 #include <linux/acpi.h>
24 #include <linux/string.h>
25 #include <linux/dmi.h>
26 #include <linux/wmi.h>
27 #include <acpi/video.h>
28 #include "dell-smbios.h"
29 #include "dell-wmi-descriptor.h"
30
31 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
32 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
33 MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
34 MODULE_LICENSE("GPL");
35
36 #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
37
38 static bool wmi_requires_smbios_request;
39
40 struct dell_wmi_priv {
41 struct input_dev *input_dev;
42 u32 interface_version;
43 };
44
dmi_matched(const struct dmi_system_id * dmi)45 static int __init dmi_matched(const struct dmi_system_id *dmi)
46 {
47 wmi_requires_smbios_request = 1;
48 return 1;
49 }
50
51 static const struct dmi_system_id dell_wmi_smbios_list[] __initconst = {
52 {
53 .callback = dmi_matched,
54 .ident = "Dell Inspiron M5110",
55 .matches = {
56 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
57 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
58 },
59 },
60 {
61 .callback = dmi_matched,
62 .ident = "Dell Vostro V131",
63 .matches = {
64 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
65 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
66 },
67 },
68 { }
69 };
70
71 /*
72 * Keymap for WMI events of type 0x0000
73 *
74 * Certain keys are flagged as KE_IGNORE. All of these are either
75 * notifications (rather than requests for change) or are also sent
76 * via the keyboard controller so should not be sent again.
77 */
78 static const struct key_entry dell_wmi_keymap_type_0000[] = {
79 { KE_IGNORE, 0x003a, { KEY_CAPSLOCK } },
80
81 /* Key code is followed by brightness level */
82 { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },
83 { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },
84
85 /* Battery health status button */
86 { KE_KEY, 0xe007, { KEY_BATTERY } },
87
88 /* Radio devices state change, key code is followed by other values */
89 { KE_IGNORE, 0xe008, { KEY_RFKILL } },
90
91 { KE_KEY, 0xe009, { KEY_EJECTCD } },
92
93 /* Key code is followed by: next, active and attached devices */
94 { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } },
95
96 /* Key code is followed by keyboard illumination level */
97 { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } },
98
99 /* BIOS error detected */
100 { KE_IGNORE, 0xe00d, { KEY_RESERVED } },
101
102 /* Battery was removed or inserted */
103 { KE_IGNORE, 0xe00e, { KEY_RESERVED } },
104
105 /* Wifi Catcher */
106 { KE_KEY, 0xe011, { KEY_WLAN } },
107
108 /* Ambient light sensor toggle */
109 { KE_IGNORE, 0xe013, { KEY_RESERVED } },
110
111 { KE_IGNORE, 0xe020, { KEY_MUTE } },
112
113 /* Unknown, defined in ACPI DSDT */
114 /* { KE_IGNORE, 0xe023, { KEY_RESERVED } }, */
115
116 /* Untested, Dell Instant Launch key on Inspiron 7520 */
117 /* { KE_IGNORE, 0xe024, { KEY_RESERVED } }, */
118
119 /* Dell Instant Launch key */
120 { KE_KEY, 0xe025, { KEY_PROG4 } },
121
122 /* Audio panel key */
123 { KE_IGNORE, 0xe026, { KEY_RESERVED } },
124
125 /* LCD Display On/Off Control key */
126 { KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } },
127
128 /* Untested, Multimedia key on Dell Vostro 3560 */
129 /* { KE_IGNORE, 0xe028, { KEY_RESERVED } }, */
130
131 /* Dell Instant Launch key */
132 { KE_KEY, 0xe029, { KEY_PROG4 } },
133
134 /* Untested, Windows Mobility Center button on Inspiron 7520 */
135 /* { KE_IGNORE, 0xe02a, { KEY_RESERVED } }, */
136
137 /* Unknown, defined in ACPI DSDT */
138 /* { KE_IGNORE, 0xe02b, { KEY_RESERVED } }, */
139
140 /* Untested, Dell Audio With Preset Switch button on Inspiron 7520 */
141 /* { KE_IGNORE, 0xe02c, { KEY_RESERVED } }, */
142
143 { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } },
144 { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } },
145 { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } },
146 { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } },
147 { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } },
148
149 /* NIC Link is Up */
150 { KE_IGNORE, 0xe043, { KEY_RESERVED } },
151
152 /* NIC Link is Down */
153 { KE_IGNORE, 0xe044, { KEY_RESERVED } },
154
155 /*
156 * This entry is very suspicious!
157 * Originally Matthew Garrett created this dell-wmi driver specially for
158 * "button with a picture of a battery" which has event code 0xe045.
159 * Later Mario Limonciello from Dell told us that event code 0xe045 is
160 * reported by Num Lock and should be ignored because key is send also
161 * by keyboard controller.
162 * So for now we will ignore this event to prevent potential double
163 * Num Lock key press.
164 */
165 { KE_IGNORE, 0xe045, { KEY_NUMLOCK } },
166
167 /* Scroll lock and also going to tablet mode on portable devices */
168 { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } },
169
170 /* Untested, going from tablet mode on portable devices */
171 /* { KE_IGNORE, 0xe047, { KEY_RESERVED } }, */
172
173 /* Dell Support Center key */
174 { KE_IGNORE, 0xe06e, { KEY_RESERVED } },
175
176 { KE_IGNORE, 0xe0f7, { KEY_MUTE } },
177 { KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } },
178 { KE_IGNORE, 0xe0f9, { KEY_VOLUMEUP } },
179 };
180
181 struct dell_bios_keymap_entry {
182 u16 scancode;
183 u16 keycode;
184 };
185
186 struct dell_bios_hotkey_table {
187 struct dmi_header header;
188 struct dell_bios_keymap_entry keymap[];
189
190 };
191
192 struct dell_dmi_results {
193 int err;
194 int keymap_size;
195 struct key_entry *keymap;
196 };
197
198 /* Uninitialized entries here are KEY_RESERVED == 0. */
199 static const u16 bios_to_linux_keycode[256] = {
200 [0] = KEY_MEDIA,
201 [1] = KEY_NEXTSONG,
202 [2] = KEY_PLAYPAUSE,
203 [3] = KEY_PREVIOUSSONG,
204 [4] = KEY_STOPCD,
205 [5] = KEY_UNKNOWN,
206 [6] = KEY_UNKNOWN,
207 [7] = KEY_UNKNOWN,
208 [8] = KEY_WWW,
209 [9] = KEY_UNKNOWN,
210 [10] = KEY_VOLUMEDOWN,
211 [11] = KEY_MUTE,
212 [12] = KEY_VOLUMEUP,
213 [13] = KEY_UNKNOWN,
214 [14] = KEY_BATTERY,
215 [15] = KEY_EJECTCD,
216 [16] = KEY_UNKNOWN,
217 [17] = KEY_SLEEP,
218 [18] = KEY_PROG1,
219 [19] = KEY_BRIGHTNESSDOWN,
220 [20] = KEY_BRIGHTNESSUP,
221 [21] = KEY_BRIGHTNESS_AUTO,
222 [22] = KEY_KBDILLUMTOGGLE,
223 [23] = KEY_UNKNOWN,
224 [24] = KEY_SWITCHVIDEOMODE,
225 [25] = KEY_UNKNOWN,
226 [26] = KEY_UNKNOWN,
227 [27] = KEY_SWITCHVIDEOMODE,
228 [28] = KEY_UNKNOWN,
229 [29] = KEY_UNKNOWN,
230 [30] = KEY_PROG2,
231 [31] = KEY_UNKNOWN,
232 [32] = KEY_UNKNOWN,
233 [33] = KEY_UNKNOWN,
234 [34] = KEY_UNKNOWN,
235 [35] = KEY_UNKNOWN,
236 [36] = KEY_UNKNOWN,
237 [37] = KEY_UNKNOWN,
238 [38] = KEY_MICMUTE,
239 [255] = KEY_PROG3,
240 };
241
242 /*
243 * Keymap for WMI events of type 0x0010
244 *
245 * These are applied if the 0xB2 DMI hotkey table is present and doesn't
246 * override them.
247 */
248 static const struct key_entry dell_wmi_keymap_type_0010[] = {
249 /* Fn-lock switched to function keys */
250 { KE_IGNORE, 0x0, { KEY_RESERVED } },
251
252 /* Fn-lock switched to multimedia keys */
253 { KE_IGNORE, 0x1, { KEY_RESERVED } },
254
255 /* Keyboard backlight change notification */
256 { KE_IGNORE, 0x3f, { KEY_RESERVED } },
257
258 /* Mic mute */
259 { KE_KEY, 0x150, { KEY_MICMUTE } },
260
261 /* Fn-lock */
262 { KE_IGNORE, 0x151, { KEY_RESERVED } },
263
264 /* Change keyboard illumination */
265 { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } },
266
267 /*
268 * Radio disable (notify only -- there is no model for which the
269 * WMI event is supposed to trigger an action).
270 */
271 { KE_IGNORE, 0x153, { KEY_RFKILL } },
272
273 /* RGB keyboard backlight control */
274 { KE_IGNORE, 0x154, { KEY_RESERVED } },
275
276 /*
277 * Stealth mode toggle. This will "disable all lights and sounds".
278 * The action is performed by the BIOS and EC; the WMI event is just
279 * a notification. On the XPS 13 9350, this is Fn+F7, and there's
280 * a BIOS setting to enable and disable the hotkey.
281 */
282 { KE_IGNORE, 0x155, { KEY_RESERVED } },
283
284 /* Rugged magnetic dock attach/detach events */
285 { KE_IGNORE, 0x156, { KEY_RESERVED } },
286 { KE_IGNORE, 0x157, { KEY_RESERVED } },
287
288 /* Rugged programmable (P1/P2/P3 keys) */
289 { KE_KEY, 0x850, { KEY_PROG1 } },
290 { KE_KEY, 0x851, { KEY_PROG2 } },
291 { KE_KEY, 0x852, { KEY_PROG3 } },
292
293 /*
294 * Radio disable (notify only -- there is no model for which the
295 * WMI event is supposed to trigger an action).
296 */
297 { KE_IGNORE, 0xe008, { KEY_RFKILL } },
298
299 /* Fn-lock */
300 { KE_IGNORE, 0xe035, { KEY_RESERVED } },
301 };
302
303 /*
304 * Keymap for WMI events of type 0x0011
305 */
306 static const struct key_entry dell_wmi_keymap_type_0011[] = {
307 /* Battery unplugged */
308 { KE_IGNORE, 0xfff0, { KEY_RESERVED } },
309
310 /* Battery inserted */
311 { KE_IGNORE, 0xfff1, { KEY_RESERVED } },
312
313 /* Keyboard backlight level changed */
314 { KE_IGNORE, KBD_LED_OFF_TOKEN, { KEY_RESERVED } },
315 { KE_IGNORE, KBD_LED_ON_TOKEN, { KEY_RESERVED } },
316 { KE_IGNORE, KBD_LED_AUTO_TOKEN, { KEY_RESERVED } },
317 { KE_IGNORE, KBD_LED_AUTO_25_TOKEN, { KEY_RESERVED } },
318 { KE_IGNORE, KBD_LED_AUTO_50_TOKEN, { KEY_RESERVED } },
319 { KE_IGNORE, KBD_LED_AUTO_75_TOKEN, { KEY_RESERVED } },
320 { KE_IGNORE, KBD_LED_AUTO_100_TOKEN, { KEY_RESERVED } },
321 };
322
dell_wmi_process_key(struct wmi_device * wdev,int type,int code)323 static void dell_wmi_process_key(struct wmi_device *wdev, int type, int code)
324 {
325 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
326 const struct key_entry *key;
327
328 key = sparse_keymap_entry_from_scancode(priv->input_dev,
329 (type << 16) | code);
330 if (!key) {
331 pr_info("Unknown key with type 0x%04x and code 0x%04x pressed\n",
332 type, code);
333 return;
334 }
335
336 pr_debug("Key with type 0x%04x and code 0x%04x pressed\n", type, code);
337
338 /* Don't report brightness notifications that will also come via ACPI */
339 if ((key->keycode == KEY_BRIGHTNESSUP ||
340 key->keycode == KEY_BRIGHTNESSDOWN) &&
341 acpi_video_handles_brightness_key_presses())
342 return;
343
344 if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request)
345 return;
346
347 if (key->keycode == KEY_KBDILLUMTOGGLE)
348 dell_laptop_call_notifier(
349 DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED, NULL);
350
351 sparse_keymap_report_entry(priv->input_dev, key, 1, true);
352 }
353
dell_wmi_notify(struct wmi_device * wdev,union acpi_object * obj)354 static void dell_wmi_notify(struct wmi_device *wdev,
355 union acpi_object *obj)
356 {
357 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
358 u16 *buffer_entry, *buffer_end;
359 acpi_size buffer_size;
360 int len, i;
361
362 if (obj->type != ACPI_TYPE_BUFFER) {
363 pr_warn("bad response type %x\n", obj->type);
364 return;
365 }
366
367 pr_debug("Received WMI event (%*ph)\n",
368 obj->buffer.length, obj->buffer.pointer);
369
370 buffer_entry = (u16 *)obj->buffer.pointer;
371 buffer_size = obj->buffer.length/2;
372 buffer_end = buffer_entry + buffer_size;
373
374 /*
375 * BIOS/ACPI on devices with WMI interface version 0 does not clear
376 * buffer before filling it. So next time when BIOS/ACPI send WMI event
377 * which is smaller as previous then it contains garbage in buffer from
378 * previous event.
379 *
380 * BIOS/ACPI on devices with WMI interface version 1 clears buffer and
381 * sometimes send more events in buffer at one call.
382 *
383 * So to prevent reading garbage from buffer we will process only first
384 * one event on devices with WMI interface version 0.
385 */
386 if (priv->interface_version == 0 && buffer_entry < buffer_end)
387 if (buffer_end > buffer_entry + buffer_entry[0] + 1)
388 buffer_end = buffer_entry + buffer_entry[0] + 1;
389
390 while (buffer_entry < buffer_end) {
391
392 len = buffer_entry[0];
393 if (len == 0)
394 break;
395
396 len++;
397
398 if (buffer_entry + len > buffer_end) {
399 pr_warn("Invalid length of WMI event\n");
400 break;
401 }
402
403 pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry);
404
405 switch (buffer_entry[1]) {
406 case 0x0000: /* One key pressed or event occurred */
407 if (len > 2)
408 dell_wmi_process_key(wdev, 0x0000,
409 buffer_entry[2]);
410 /* Other entries could contain additional information */
411 break;
412 case 0x0010: /* Sequence of keys pressed */
413 case 0x0011: /* Sequence of events occurred */
414 for (i = 2; i < len; ++i)
415 dell_wmi_process_key(wdev, buffer_entry[1],
416 buffer_entry[i]);
417 break;
418 default: /* Unknown event */
419 pr_info("Unknown WMI event type 0x%x\n",
420 (int)buffer_entry[1]);
421 break;
422 }
423
424 buffer_entry += len;
425
426 }
427
428 }
429
have_scancode(u32 scancode,const struct key_entry * keymap,int len)430 static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len)
431 {
432 int i;
433
434 for (i = 0; i < len; i++)
435 if (keymap[i].code == scancode)
436 return true;
437
438 return false;
439 }
440
handle_dmi_entry(const struct dmi_header * dm,void * opaque)441 static void handle_dmi_entry(const struct dmi_header *dm, void *opaque)
442 {
443 struct dell_dmi_results *results = opaque;
444 struct dell_bios_hotkey_table *table;
445 int hotkey_num, i, pos = 0;
446 struct key_entry *keymap;
447
448 if (results->err || results->keymap)
449 return; /* We already found the hotkey table. */
450
451 /* The Dell hotkey table is type 0xB2. Scan until we find it. */
452 if (dm->type != 0xb2)
453 return;
454
455 table = container_of(dm, struct dell_bios_hotkey_table, header);
456
457 hotkey_num = (table->header.length -
458 sizeof(struct dell_bios_hotkey_table)) /
459 sizeof(struct dell_bios_keymap_entry);
460 if (hotkey_num < 1) {
461 /*
462 * Historically, dell-wmi would ignore a DMI entry of
463 * fewer than 7 bytes. Sizes between 4 and 8 bytes are
464 * nonsensical (both the header and all entries are 4
465 * bytes), so we approximate the old behavior by
466 * ignoring tables with fewer than one entry.
467 */
468 return;
469 }
470
471 keymap = kcalloc(hotkey_num, sizeof(struct key_entry), GFP_KERNEL);
472 if (!keymap) {
473 results->err = -ENOMEM;
474 return;
475 }
476
477 for (i = 0; i < hotkey_num; i++) {
478 const struct dell_bios_keymap_entry *bios_entry =
479 &table->keymap[i];
480
481 /* Uninitialized entries are 0 aka KEY_RESERVED. */
482 u16 keycode = (bios_entry->keycode <
483 ARRAY_SIZE(bios_to_linux_keycode)) ?
484 bios_to_linux_keycode[bios_entry->keycode] :
485 KEY_RESERVED;
486
487 /*
488 * Log if we find an entry in the DMI table that we don't
489 * understand. If this happens, we should figure out what
490 * the entry means and add it to bios_to_linux_keycode.
491 */
492 if (keycode == KEY_RESERVED) {
493 pr_info("firmware scancode 0x%x maps to unrecognized keycode 0x%x\n",
494 bios_entry->scancode, bios_entry->keycode);
495 continue;
496 }
497
498 if (keycode == KEY_KBDILLUMTOGGLE)
499 keymap[pos].type = KE_IGNORE;
500 else
501 keymap[pos].type = KE_KEY;
502 keymap[pos].code = bios_entry->scancode;
503 keymap[pos].keycode = keycode;
504
505 pos++;
506 }
507
508 results->keymap = keymap;
509 results->keymap_size = pos;
510 }
511
dell_wmi_input_setup(struct wmi_device * wdev)512 static int dell_wmi_input_setup(struct wmi_device *wdev)
513 {
514 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
515 struct dell_dmi_results dmi_results = {};
516 struct key_entry *keymap;
517 int err, i, pos = 0;
518
519 priv->input_dev = input_allocate_device();
520 if (!priv->input_dev)
521 return -ENOMEM;
522
523 priv->input_dev->name = "Dell WMI hotkeys";
524 priv->input_dev->id.bustype = BUS_HOST;
525 priv->input_dev->dev.parent = &wdev->dev;
526
527 if (dmi_walk(handle_dmi_entry, &dmi_results)) {
528 /*
529 * Historically, dell-wmi ignored dmi_walk errors. A failure
530 * is certainly surprising, but it probably just indicates
531 * a very old laptop.
532 */
533 pr_warn("no DMI; using the old-style hotkey interface\n");
534 }
535
536 if (dmi_results.err) {
537 err = dmi_results.err;
538 goto err_free_dev;
539 }
540
541 keymap = kcalloc(dmi_results.keymap_size +
542 ARRAY_SIZE(dell_wmi_keymap_type_0000) +
543 ARRAY_SIZE(dell_wmi_keymap_type_0010) +
544 ARRAY_SIZE(dell_wmi_keymap_type_0011) +
545 1,
546 sizeof(struct key_entry), GFP_KERNEL);
547 if (!keymap) {
548 kfree(dmi_results.keymap);
549 err = -ENOMEM;
550 goto err_free_dev;
551 }
552
553 /* Append table with events of type 0x0010 which comes from DMI */
554 for (i = 0; i < dmi_results.keymap_size; i++) {
555 keymap[pos] = dmi_results.keymap[i];
556 keymap[pos].code |= (0x0010 << 16);
557 pos++;
558 }
559
560 kfree(dmi_results.keymap);
561
562 /* Append table with extra events of type 0x0010 which are not in DMI */
563 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0010); i++) {
564 const struct key_entry *entry = &dell_wmi_keymap_type_0010[i];
565
566 /*
567 * Check if we've already found this scancode. This takes
568 * quadratic time, but it doesn't matter unless the list
569 * of extra keys gets very long.
570 */
571 if (dmi_results.keymap_size &&
572 have_scancode(entry->code | (0x0010 << 16),
573 keymap, dmi_results.keymap_size)
574 )
575 continue;
576
577 keymap[pos] = *entry;
578 keymap[pos].code |= (0x0010 << 16);
579 pos++;
580 }
581
582 /* Append table with events of type 0x0011 */
583 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0011); i++) {
584 keymap[pos] = dell_wmi_keymap_type_0011[i];
585 keymap[pos].code |= (0x0011 << 16);
586 pos++;
587 }
588
589 /*
590 * Now append also table with "legacy" events of type 0x0000. Some of
591 * them are reported also on laptops which have scancodes in DMI.
592 */
593 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0000); i++) {
594 keymap[pos] = dell_wmi_keymap_type_0000[i];
595 pos++;
596 }
597
598 keymap[pos].type = KE_END;
599
600 err = sparse_keymap_setup(priv->input_dev, keymap, NULL);
601 /*
602 * Sparse keymap library makes a copy of keymap so we don't need the
603 * original one that was allocated.
604 */
605 kfree(keymap);
606 if (err)
607 goto err_free_dev;
608
609 err = input_register_device(priv->input_dev);
610 if (err)
611 goto err_free_dev;
612
613 return 0;
614
615 err_free_dev:
616 input_free_device(priv->input_dev);
617 return err;
618 }
619
dell_wmi_input_destroy(struct wmi_device * wdev)620 static void dell_wmi_input_destroy(struct wmi_device *wdev)
621 {
622 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
623
624 input_unregister_device(priv->input_dev);
625 }
626
627 /*
628 * According to Dell SMBIOS documentation:
629 *
630 * 17 3 Application Program Registration
631 *
632 * cbArg1 Application ID 1 = 0x00010000
633 * cbArg2 Application ID 2
634 * QUICKSET/DCP = 0x51534554 "QSET"
635 * ALS Driver = 0x416c7353 "AlsS"
636 * Latitude ON = 0x4c6f6e52 "LonR"
637 * cbArg3 Application version or revision number
638 * cbArg4 0 = Unregister application
639 * 1 = Register application
640 * cbRes1 Standard return codes (0, -1, -2)
641 */
642
dell_wmi_events_set_enabled(bool enable)643 static int dell_wmi_events_set_enabled(bool enable)
644 {
645 struct calling_interface_buffer *buffer;
646 int ret;
647
648 buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);
649 if (!buffer)
650 return -ENOMEM;
651 buffer->cmd_class = CLASS_INFO;
652 buffer->cmd_select = SELECT_APP_REGISTRATION;
653 buffer->input[0] = 0x10000;
654 buffer->input[1] = 0x51534554;
655 buffer->input[3] = enable;
656 ret = dell_smbios_call(buffer);
657 if (ret == 0)
658 ret = buffer->output[0];
659 kfree(buffer);
660
661 return dell_smbios_error(ret);
662 }
663
dell_wmi_probe(struct wmi_device * wdev,const void * context)664 static int dell_wmi_probe(struct wmi_device *wdev, const void *context)
665 {
666 struct dell_wmi_priv *priv;
667 int ret;
668
669 ret = dell_wmi_get_descriptor_valid();
670 if (ret)
671 return ret;
672
673 priv = devm_kzalloc(
674 &wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL);
675 if (!priv)
676 return -ENOMEM;
677 dev_set_drvdata(&wdev->dev, priv);
678
679 if (!dell_wmi_get_interface_version(&priv->interface_version))
680 return -EPROBE_DEFER;
681
682 return dell_wmi_input_setup(wdev);
683 }
684
dell_wmi_remove(struct wmi_device * wdev)685 static int dell_wmi_remove(struct wmi_device *wdev)
686 {
687 dell_wmi_input_destroy(wdev);
688 return 0;
689 }
690 static const struct wmi_device_id dell_wmi_id_table[] = {
691 { .guid_string = DELL_EVENT_GUID },
692 { },
693 };
694
695 static struct wmi_driver dell_wmi_driver = {
696 .driver = {
697 .name = "dell-wmi",
698 },
699 .id_table = dell_wmi_id_table,
700 .probe = dell_wmi_probe,
701 .remove = dell_wmi_remove,
702 .notify = dell_wmi_notify,
703 };
704
dell_wmi_init(void)705 static int __init dell_wmi_init(void)
706 {
707 int err;
708
709 dmi_check_system(dell_wmi_smbios_list);
710
711 if (wmi_requires_smbios_request) {
712 err = dell_wmi_events_set_enabled(true);
713 if (err) {
714 pr_err("Failed to enable WMI events\n");
715 return err;
716 }
717 }
718
719 return wmi_driver_register(&dell_wmi_driver);
720 }
721 late_initcall(dell_wmi_init);
722
dell_wmi_exit(void)723 static void __exit dell_wmi_exit(void)
724 {
725 if (wmi_requires_smbios_request)
726 dell_wmi_events_set_enabled(false);
727
728 wmi_driver_unregister(&dell_wmi_driver);
729 }
730 module_exit(dell_wmi_exit);
731
732 MODULE_DEVICE_TABLE(wmi, dell_wmi_id_table);
733
