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