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/drivers/platform/x86/dell-wmi.c

http://github.com/mirrors/linux
C | 732 lines | 438 code | 133 blank | 161 comment | 58 complexity | ee798f90bc80cff7f9c23656f582b450 MD5 | raw file
  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@kernel.org>
  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
 31MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 32MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
 33MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
 34MODULE_LICENSE("GPL");
 35
 36#define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
 37
 38static bool wmi_requires_smbios_request;
 39
 40struct dell_wmi_priv {
 41	struct input_dev *input_dev;
 42	u32 interface_version;
 43};
 44
 45static int __init dmi_matched(const struct dmi_system_id *dmi)
 46{
 47	wmi_requires_smbios_request = 1;
 48	return 1;
 49}
 50
 51static 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 */
 78static 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
181struct dell_bios_keymap_entry {
182	u16 scancode;
183	u16 keycode;
184};
185
186struct dell_bios_hotkey_table {
187	struct dmi_header header;
188	struct dell_bios_keymap_entry keymap[];
189
190};
191
192struct 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. */
199static 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 */
248static 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 */
306static 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
323static 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
354static 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
430static 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
441static 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
512static 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
620static 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
643static 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
664static 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
685static int dell_wmi_remove(struct wmi_device *wdev)
686{
687	dell_wmi_input_destroy(wdev);
688	return 0;
689}
690static const struct wmi_device_id dell_wmi_id_table[] = {
691	{ .guid_string = DELL_EVENT_GUID },
692	{ },
693};
694
695static 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
705static 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}
721late_initcall(dell_wmi_init);
722
723static 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}
730module_exit(dell_wmi_exit);
731
732MODULE_DEVICE_TABLE(wmi, dell_wmi_id_table);