drivers/platform/x86/dell-wmi.c

   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
  31 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
  32 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
  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
  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         /* Backlight brightness level */
 259         { KE_KEY,    0x57, { KEY_BRIGHTNESSDOWN } },
 260         { KE_KEY,    0x58, { KEY_BRIGHTNESSUP } },
 261
 262         /* Mic mute */
 263         { KE_KEY, 0x150, { KEY_MICMUTE } },
 264
 265         /* Fn-lock */
 266         { KE_IGNORE, 0x151, { KEY_RESERVED } },
 267
 268         /* Change keyboard illumination */
 269         { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } },
 270
 271         /*
 272          * Radio disable (notify only -- there is no model for which the
 273          * WMI event is supposed to trigger an action).
 274          */
 275         { KE_IGNORE, 0x153, { KEY_RFKILL } },
 276
 277         /* RGB keyboard backlight control */
 278         { KE_IGNORE, 0x154, { KEY_RESERVED } },
 279
 280         /*
 281          * Stealth mode toggle. This will "disable all lights and sounds".
 282          * The action is performed by the BIOS and EC; the WMI event is just
 283          * a notification. On the XPS 13 9350, this is Fn+F7, and there's
 284          * a BIOS setting to enable and disable the hotkey.
 285          */
 286         { KE_IGNORE, 0x155, { KEY_RESERVED } },
 287
 288         /* Rugged magnetic dock attach/detach events */
 289         { KE_IGNORE, 0x156, { KEY_RESERVED } },
 290         { KE_IGNORE, 0x157, { KEY_RESERVED } },
 291
 292         /* Rugged programmable (P1/P2/P3 keys) */
 293         { KE_KEY,    0x850, { KEY_PROG1 } },
 294         { KE_KEY,    0x851, { KEY_PROG2 } },
 295         { KE_KEY,    0x852, { KEY_PROG3 } },
 296
 297         /*
 298          * Radio disable (notify only -- there is no model for which the
 299          * WMI event is supposed to trigger an action).
 300          */
 301         { KE_IGNORE, 0xe008, { KEY_RFKILL } },
 302
 303         /* Fn-lock */
 304         { KE_IGNORE, 0xe035, { KEY_RESERVED } },
 305 };
 306
 307 /*
 308  * Keymap for WMI events of type 0x0011
 309  */
 310 static const struct key_entry dell_wmi_keymap_type_0011[] = {
 311         /* Battery unplugged */
 312         { KE_IGNORE, 0xfff0, { KEY_RESERVED } },
 313
 314         /* Battery inserted */
 315         { KE_IGNORE, 0xfff1, { KEY_RESERVED } },
 316
 317         /*
 318          * Detachable keyboard detached / undocked
 319          * Note SW_TABLET_MODE is already reported through the intel_vbtn
 320          * driver for this, so we ignore it.
 321          */
 322         { KE_IGNORE, 0xfff2, { KEY_RESERVED } },
 323
 324         /* Detachable keyboard attached / docked */
 325         { KE_IGNORE, 0xfff3, { KEY_RESERVED } },
 326
 327         /* Keyboard backlight level changed */
 328         { KE_IGNORE, KBD_LED_OFF_TOKEN,      { KEY_RESERVED } },
 329         { KE_IGNORE, KBD_LED_ON_TOKEN,       { KEY_RESERVED } },
 330         { KE_IGNORE, KBD_LED_AUTO_TOKEN,     { KEY_RESERVED } },
 331         { KE_IGNORE, KBD_LED_AUTO_25_TOKEN,  { KEY_RESERVED } },
 332         { KE_IGNORE, KBD_LED_AUTO_50_TOKEN,  { KEY_RESERVED } },
 333         { KE_IGNORE, KBD_LED_AUTO_75_TOKEN,  { KEY_RESERVED } },
 334         { KE_IGNORE, KBD_LED_AUTO_100_TOKEN, { KEY_RESERVED } },
 335 };
 336
 337 /*
 338  * Keymap for WMI events of type 0x0012
 339  * They are events with extended data
 340  */
 341 static const struct key_entry dell_wmi_keymap_type_0012[] = {
 342         /* Fn-lock button pressed */
 343         { KE_IGNORE, 0xe035, { KEY_RESERVED } },
 344 };
 345
 346 static void dell_wmi_process_key(struct wmi_device *wdev, int type, int code)
 347 {
 348         struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
 349         const struct key_entry *key;
 350
 351         key = sparse_keymap_entry_from_scancode(priv->input_dev,
 352                                                 (type << 16) | code);
 353         if (!key) {
 354                 pr_info("Unknown key with type 0x%04x and code 0x%04x pressed\n",
 355                         type, code);
 356                 return;
 357         }
 358
 359         pr_debug("Key with type 0x%04x and code 0x%04x pressed\n", type, code);
 360
 361         /* Don't report brightness notifications that will also come via ACPI */
 362         if ((key->keycode == KEY_BRIGHTNESSUP ||
 363              key->keycode == KEY_BRIGHTNESSDOWN) &&
 364             acpi_video_handles_brightness_key_presses())
 365                 return;
 366
 367         if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request)
 368                 return;
 369
 370         if (key->keycode == KEY_KBDILLUMTOGGLE)
 371                 dell_laptop_call_notifier(
 372                         DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED, NULL);
 373
 374         sparse_keymap_report_entry(priv->input_dev, key, 1, true);
 375 }
 376
 377 static void dell_wmi_notify(struct wmi_device *wdev,
 378                             union acpi_object *obj)
 379 {
 380         struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
 381         u16 *buffer_entry, *buffer_end;
 382         acpi_size buffer_size;
 383         int len, i;
 384
 385         if (obj->type != ACPI_TYPE_BUFFER) {
 386                 pr_warn("bad response type %x\n", obj->type);
 387                 return;
 388         }
 389
 390         pr_debug("Received WMI event (%*ph)\n",
 391                 obj->buffer.length, obj->buffer.pointer);
 392
 393         buffer_entry = (u16 *)obj->buffer.pointer;
 394         buffer_size = obj->buffer.length/2;
 395         buffer_end = buffer_entry + buffer_size;
 396
 397         /*
 398          * BIOS/ACPI on devices with WMI interface version 0 does not clear
 399          * buffer before filling it. So next time when BIOS/ACPI send WMI event
 400          * which is smaller as previous then it contains garbage in buffer from
 401          * previous event.
 402          *
 403          * BIOS/ACPI on devices with WMI interface version 1 clears buffer and
 404          * sometimes send more events in buffer at one call.
 405          *
 406          * So to prevent reading garbage from buffer we will process only first
 407          * one event on devices with WMI interface version 0.
 408          */
 409         if (priv->interface_version == 0 && buffer_entry < buffer_end)
 410                 if (buffer_end > buffer_entry + buffer_entry[0] + 1)
 411                         buffer_end = buffer_entry + buffer_entry[0] + 1;
 412
 413         while (buffer_entry < buffer_end) {
 414
 415                 len = buffer_entry[0];
 416                 if (len == 0)
 417                         break;
 418
 419                 len++;
 420
 421                 if (buffer_entry + len > buffer_end) {
 422                         pr_warn("Invalid length of WMI event\n");
 423                         break;
 424                 }
 425
 426                 pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry);
 427
 428                 switch (buffer_entry[1]) {
 429                 case 0x0000: /* One key pressed or event occurred */
 430                 case 0x0012: /* Event with extended data occurred */
 431                         if (len > 2)
 432                                 dell_wmi_process_key(wdev, buffer_entry[1],
 433                                                      buffer_entry[2]);
 434                         /* Extended data is currently ignored */
 435                         break;
 436                 case 0x0010: /* Sequence of keys pressed */
 437                 case 0x0011: /* Sequence of events occurred */
 438                         for (i = 2; i < len; ++i)
 439                                 dell_wmi_process_key(wdev, buffer_entry[1],
 440                                                      buffer_entry[i]);
 441                         break;
 442                 default: /* Unknown event */
 443                         pr_info("Unknown WMI event type 0x%x\n",
 444                                 (int)buffer_entry[1]);
 445                         break;
 446                 }
 447
 448                 buffer_entry += len;
 449
 450         }
 451
 452 }
 453
 454 static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len)
 455 {
 456         int i;
 457
 458         for (i = 0; i < len; i++)
 459                 if (keymap[i].code == scancode)
 460                         return true;
 461
 462         return false;
 463 }
 464
 465 static void handle_dmi_entry(const struct dmi_header *dm, void *opaque)
 466 {
 467         struct dell_dmi_results *results = opaque;
 468         struct dell_bios_hotkey_table *table;
 469         int hotkey_num, i, pos = 0;
 470         struct key_entry *keymap;
 471
 472         if (results->err || results->keymap)
 473                 return;         /* We already found the hotkey table. */
 474
 475         /* The Dell hotkey table is type 0xB2.  Scan until we find it. */
 476         if (dm->type != 0xb2)
 477                 return;
 478
 479         table = container_of(dm, struct dell_bios_hotkey_table, header);
 480
 481         hotkey_num = (table->header.length -
 482                       sizeof(struct dell_bios_hotkey_table)) /
 483                                 sizeof(struct dell_bios_keymap_entry);
 484         if (hotkey_num < 1) {
 485                 /*
 486                  * Historically, dell-wmi would ignore a DMI entry of
 487                  * fewer than 7 bytes.  Sizes between 4 and 8 bytes are
 488                  * nonsensical (both the header and all entries are 4
 489                  * bytes), so we approximate the old behavior by
 490                  * ignoring tables with fewer than one entry.
 491                  */
 492                 return;
 493         }
 494
 495         keymap = kcalloc(hotkey_num, sizeof(struct key_entry), GFP_KERNEL);
 496         if (!keymap) {
 497                 results->err = -ENOMEM;
 498                 return;
 499         }
 500
 501         for (i = 0; i < hotkey_num; i++) {
 502                 const struct dell_bios_keymap_entry *bios_entry =
 503                                         &table->keymap[i];
 504
 505                 /* Uninitialized entries are 0 aka KEY_RESERVED. */
 506                 u16 keycode = (bios_entry->keycode <
 507                                ARRAY_SIZE(bios_to_linux_keycode)) ?
 508                         bios_to_linux_keycode[bios_entry->keycode] :
 509                         (bios_entry->keycode == 0xffff ? KEY_UNKNOWN : KEY_RESERVED);
 510
 511                 /*
 512                  * Log if we find an entry in the DMI table that we don't
 513                  * understand.  If this happens, we should figure out what
 514                  * the entry means and add it to bios_to_linux_keycode.
 515                  */
 516                 if (keycode == KEY_RESERVED) {
 517                         pr_info("firmware scancode 0x%x maps to unrecognized keycode 0x%x\n",
 518                                 bios_entry->scancode, bios_entry->keycode);
 519                         continue;
 520                 }
 521
 522                 if (keycode == KEY_KBDILLUMTOGGLE)
 523                         keymap[pos].type = KE_IGNORE;
 524                 else
 525                         keymap[pos].type = KE_KEY;
 526                 keymap[pos].code = bios_entry->scancode;
 527                 keymap[pos].keycode = keycode;
 528
 529                 pos++;
 530         }
 531
 532         results->keymap = keymap;
 533         results->keymap_size = pos;
 534 }
 535
 536 static int dell_wmi_input_setup(struct wmi_device *wdev)
 537 {
 538         struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
 539         struct dell_dmi_results dmi_results = {};
 540         struct key_entry *keymap;
 541         int err, i, pos = 0;
 542
 543         priv->input_dev = input_allocate_device();
 544         if (!priv->input_dev)
 545                 return -ENOMEM;
 546
 547         priv->input_dev->name = "Dell WMI hotkeys";
 548         priv->input_dev->id.bustype = BUS_HOST;
 549         priv->input_dev->dev.parent = &wdev->dev;
 550
 551         if (dmi_walk(handle_dmi_entry, &dmi_results)) {
 552                 /*
 553                  * Historically, dell-wmi ignored dmi_walk errors.  A failure
 554                  * is certainly surprising, but it probably just indicates
 555                  * a very old laptop.
 556                  */
 557                 pr_warn("no DMI; using the old-style hotkey interface\n");
 558         }
 559
 560         if (dmi_results.err) {
 561                 err = dmi_results.err;
 562                 goto err_free_dev;
 563         }
 564
 565         keymap = kcalloc(dmi_results.keymap_size +
 566                          ARRAY_SIZE(dell_wmi_keymap_type_0000) +
 567                          ARRAY_SIZE(dell_wmi_keymap_type_0010) +
 568                          ARRAY_SIZE(dell_wmi_keymap_type_0011) +
 569                          ARRAY_SIZE(dell_wmi_keymap_type_0012) +
 570                          1,
 571                          sizeof(struct key_entry), GFP_KERNEL);
 572         if (!keymap) {
 573                 kfree(dmi_results.keymap);
 574                 err = -ENOMEM;
 575                 goto err_free_dev;
 576         }
 577
 578         /* Append table with events of type 0x0010 which comes from DMI */
 579         for (i = 0; i < dmi_results.keymap_size; i++) {
 580                 keymap[pos] = dmi_results.keymap[i];
 581                 keymap[pos].code |= (0x0010 << 16);
 582                 pos++;
 583         }
 584
 585         kfree(dmi_results.keymap);
 586
 587         /* Append table with extra events of type 0x0010 which are not in DMI */
 588         for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0010); i++) {
 589                 const struct key_entry *entry = &dell_wmi_keymap_type_0010[i];
 590
 591                 /*
 592                  * Check if we've already found this scancode.  This takes
 593                  * quadratic time, but it doesn't matter unless the list
 594                  * of extra keys gets very long.
 595                  */
 596                 if (dmi_results.keymap_size &&
 597                     have_scancode(entry->code | (0x0010 << 16),
 598                                   keymap, dmi_results.keymap_size)
 599                    )
 600                         continue;
 601
 602                 keymap[pos] = *entry;
 603                 keymap[pos].code |= (0x0010 << 16);
 604                 pos++;
 605         }
 606
 607         /* Append table with events of type 0x0011 */
 608         for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0011); i++) {
 609                 keymap[pos] = dell_wmi_keymap_type_0011[i];
 610                 keymap[pos].code |= (0x0011 << 16);
 611                 pos++;
 612         }
 613
 614         /* Append table with events of type 0x0012 */
 615         for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0012); i++) {
 616                 keymap[pos] = dell_wmi_keymap_type_0012[i];
 617                 keymap[pos].code |= (0x0012 << 16);
 618                 pos++;
 619         }
 620
 621         /*
 622          * Now append also table with "legacy" events of type 0x0000. Some of
 623          * them are reported also on laptops which have scancodes in DMI.
 624          */
 625         for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0000); i++) {
 626                 keymap[pos] = dell_wmi_keymap_type_0000[i];
 627                 pos++;
 628         }
 629
 630         keymap[pos].type = KE_END;
 631
 632         err = sparse_keymap_setup(priv->input_dev, keymap, NULL);
 633         /*
 634          * Sparse keymap library makes a copy of keymap so we don't need the
 635          * original one that was allocated.
 636          */
 637         kfree(keymap);
 638         if (err)
 639                 goto err_free_dev;
 640
 641         err = input_register_device(priv->input_dev);
 642         if (err)
 643                 goto err_free_dev;
 644
 645         return 0;
 646
 647  err_free_dev:
 648         input_free_device(priv->input_dev);
 649         return err;
 650 }
 651
 652 static void dell_wmi_input_destroy(struct wmi_device *wdev)
 653 {
 654         struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
 655
 656         input_unregister_device(priv->input_dev);
 657 }
 658
 659 /*
 660  * According to Dell SMBIOS documentation:
 661  *
 662  * 17  3  Application Program Registration
 663  *
 664  *     cbArg1 Application ID 1 = 0x00010000
 665  *     cbArg2 Application ID 2
 666  *            QUICKSET/DCP = 0x51534554 "QSET"
 667  *            ALS Driver   = 0x416c7353 "AlsS"
 668  *            Latitude ON  = 0x4c6f6e52 "LonR"
 669  *     cbArg3 Application version or revision number
 670  *     cbArg4 0 = Unregister application
 671  *            1 = Register application
 672  *     cbRes1 Standard return codes (0, -1, -2)
 673  */
 674
 675 static int dell_wmi_events_set_enabled(bool enable)
 676 {
 677         struct calling_interface_buffer *buffer;
 678         int ret;
 679
 680         buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);
 681         if (!buffer)
 682                 return -ENOMEM;
 683         buffer->cmd_class = CLASS_INFO;
 684         buffer->cmd_select = SELECT_APP_REGISTRATION;
 685         buffer->input[0] = 0x10000;
 686         buffer->input[1] = 0x51534554;
 687         buffer->input[3] = enable;
 688         ret = dell_smbios_call(buffer);
 689         if (ret == 0)
 690                 ret = buffer->output[0];
 691         kfree(buffer);
 692
 693         return dell_smbios_error(ret);
 694 }
 695
 696 static int dell_wmi_probe(struct wmi_device *wdev, const void *context)
 697 {
 698         struct dell_wmi_priv *priv;
 699         int ret;
 700
 701         ret = dell_wmi_get_descriptor_valid();
 702         if (ret)
 703                 return ret;
 704
 705         priv = devm_kzalloc(
 706                 &wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL);
 707         if (!priv)
 708                 return -ENOMEM;
 709         dev_set_drvdata(&wdev->dev, priv);
 710
 711         if (!dell_wmi_get_interface_version(&priv->interface_version))
 712                 return -EPROBE_DEFER;
 713
 714         return dell_wmi_input_setup(wdev);
 715 }
 716
 717 static int dell_wmi_remove(struct wmi_device *wdev)
 718 {
 719         dell_wmi_input_destroy(wdev);
 720         return 0;
 721 }
 722 static const struct wmi_device_id dell_wmi_id_table[] = {
 723         { .guid_string = DELL_EVENT_GUID },
 724         { },
 725 };
 726
 727 static struct wmi_driver dell_wmi_driver = {
 728         .driver = {
 729                 .name = "dell-wmi",
 730         },
 731         .id_table = dell_wmi_id_table,
 732         .probe = dell_wmi_probe,
 733         .remove = dell_wmi_remove,
 734         .notify = dell_wmi_notify,
 735 };
 736
 737 static int __init dell_wmi_init(void)
 738 {
 739         int err;
 740
 741         dmi_check_system(dell_wmi_smbios_list);
 742
 743         if (wmi_requires_smbios_request) {
 744                 err = dell_wmi_events_set_enabled(true);
 745                 if (err) {
 746                         pr_err("Failed to enable WMI events\n");
 747                         return err;
 748                 }
 749         }
 750
 751         return wmi_driver_register(&dell_wmi_driver);
 752 }
 753 late_initcall(dell_wmi_init);
 754
 755 static void __exit dell_wmi_exit(void)
 756 {
 757         if (wmi_requires_smbios_request)
 758                 dell_wmi_events_set_enabled(false);
 759
 760         wmi_driver_unregister(&dell_wmi_driver);
 761 }
 762 module_exit(dell_wmi_exit);
 763
 764 MODULE_DEVICE_TABLE(wmi, dell_wmi_id_table);