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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Dell WMI hotkeys4 *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 ": " fmt15 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#include "dell-wmi-privacy.h"31 32MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");33MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");34MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");35MODULE_LICENSE("GPL");36 37#define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"38 39static bool wmi_requires_smbios_request;40 41struct dell_wmi_priv {42 struct input_dev *input_dev;43 struct input_dev *tabletswitch_dev;44 u32 interface_version;45};46 47static int __init dmi_matched(const struct dmi_system_id *dmi)48{49 wmi_requires_smbios_request = 1;50 return 1;51}52 53static const struct dmi_system_id dell_wmi_smbios_list[] __initconst = {54 {55 .callback = dmi_matched,56 .ident = "Dell Inspiron M5110",57 .matches = {58 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),59 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),60 },61 },62 {63 .callback = dmi_matched,64 .ident = "Dell Vostro V131",65 .matches = {66 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),67 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),68 },69 },70 { }71};72 73/*74 * Keymap for WMI events of type 0x000075 *76 * Certain keys are flagged as KE_IGNORE. All of these are either77 * notifications (rather than requests for change) or are also sent78 * via the keyboard controller so should not be sent again.79 */80static const struct key_entry dell_wmi_keymap_type_0000[] = {81 { KE_IGNORE, 0x003a, { KEY_CAPSLOCK } },82 83 /* Meta key lock */84 { KE_IGNORE, 0xe000, { KEY_RIGHTMETA } },85 86 /* Meta key unlock */87 { KE_IGNORE, 0xe001, { KEY_RIGHTMETA } },88 89 /* Key code is followed by brightness level */90 { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },91 { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },92 93 /* Battery health status button */94 { KE_KEY, 0xe007, { KEY_BATTERY } },95 96 /* Radio devices state change, key code is followed by other values */97 { KE_IGNORE, 0xe008, { KEY_RFKILL } },98 99 { KE_KEY, 0xe009, { KEY_EJECTCD } },100 101 /* Key code is followed by: next, active and attached devices */102 { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } },103 104 /* Key code is followed by keyboard illumination level */105 { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } },106 107 /* BIOS error detected */108 { KE_IGNORE, 0xe00d, { KEY_RESERVED } },109 110 /* Battery was removed or inserted */111 { KE_IGNORE, 0xe00e, { KEY_RESERVED } },112 113 /* Wifi Catcher */114 { KE_KEY, 0xe011, { KEY_WLAN } },115 116 /* Ambient light sensor toggle */117 { KE_IGNORE, 0xe013, { KEY_RESERVED } },118 119 { KE_IGNORE, 0xe020, { KEY_MUTE } },120 121 /* Unknown, defined in ACPI DSDT */122 /* { KE_IGNORE, 0xe023, { KEY_RESERVED } }, */123 124 /* Untested, Dell Instant Launch key on Inspiron 7520 */125 /* { KE_IGNORE, 0xe024, { KEY_RESERVED } }, */126 127 /* Dell Instant Launch key */128 { KE_KEY, 0xe025, { KEY_PROG4 } },129 130 /* Audio panel key */131 { KE_IGNORE, 0xe026, { KEY_RESERVED } },132 133 /* LCD Display On/Off Control key */134 { KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } },135 136 /* Untested, Multimedia key on Dell Vostro 3560 */137 /* { KE_IGNORE, 0xe028, { KEY_RESERVED } }, */138 139 /* Dell Instant Launch key */140 { KE_KEY, 0xe029, { KEY_PROG4 } },141 142 /* Untested, Windows Mobility Center button on Inspiron 7520 */143 /* { KE_IGNORE, 0xe02a, { KEY_RESERVED } }, */144 145 /* Unknown, defined in ACPI DSDT */146 /* { KE_IGNORE, 0xe02b, { KEY_RESERVED } }, */147 148 /* Untested, Dell Audio With Preset Switch button on Inspiron 7520 */149 /* { KE_IGNORE, 0xe02c, { KEY_RESERVED } }, */150 151 { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } },152 { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } },153 { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } },154 { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } },155 { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } },156 157 /* NIC Link is Up */158 { KE_IGNORE, 0xe043, { KEY_RESERVED } },159 160 /* NIC Link is Down */161 { KE_IGNORE, 0xe044, { KEY_RESERVED } },162 163 /*164 * This entry is very suspicious!165 * Originally Matthew Garrett created this dell-wmi driver specially for166 * "button with a picture of a battery" which has event code 0xe045.167 * Later Mario Limonciello from Dell told us that event code 0xe045 is168 * reported by Num Lock and should be ignored because key is send also169 * by keyboard controller.170 * So for now we will ignore this event to prevent potential double171 * Num Lock key press.172 */173 { KE_IGNORE, 0xe045, { KEY_NUMLOCK } },174 175 /* Scroll lock and also going to tablet mode on portable devices */176 { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } },177 178 /* Untested, going from tablet mode on portable devices */179 /* { KE_IGNORE, 0xe047, { KEY_RESERVED } }, */180 181 /* Dell Support Center key */182 { KE_IGNORE, 0xe06e, { KEY_RESERVED } },183 184 { KE_IGNORE, 0xe0f7, { KEY_MUTE } },185 { KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } },186 { KE_IGNORE, 0xe0f9, { KEY_VOLUMEUP } },187};188 189struct dell_bios_keymap_entry {190 u16 scancode;191 u16 keycode;192};193 194struct dell_bios_hotkey_table {195 struct dmi_header header;196 struct dell_bios_keymap_entry keymap[];197 198};199 200struct dell_dmi_results {201 int err;202 int keymap_size;203 struct key_entry *keymap;204};205 206/* Uninitialized entries here are KEY_RESERVED == 0. */207static const u16 bios_to_linux_keycode[256] = {208 [0] = KEY_MEDIA,209 [1] = KEY_NEXTSONG,210 [2] = KEY_PLAYPAUSE,211 [3] = KEY_PREVIOUSSONG,212 [4] = KEY_STOPCD,213 [5] = KEY_UNKNOWN,214 [6] = KEY_UNKNOWN,215 [7] = KEY_UNKNOWN,216 [8] = KEY_WWW,217 [9] = KEY_UNKNOWN,218 [10] = KEY_VOLUMEDOWN,219 [11] = KEY_MUTE,220 [12] = KEY_VOLUMEUP,221 [13] = KEY_UNKNOWN,222 [14] = KEY_BATTERY,223 [15] = KEY_EJECTCD,224 [16] = KEY_UNKNOWN,225 [17] = KEY_SLEEP,226 [18] = KEY_PROG1,227 [19] = KEY_BRIGHTNESSDOWN,228 [20] = KEY_BRIGHTNESSUP,229 [21] = KEY_BRIGHTNESS_AUTO,230 [22] = KEY_KBDILLUMTOGGLE,231 [23] = KEY_UNKNOWN,232 [24] = KEY_SWITCHVIDEOMODE,233 [25] = KEY_UNKNOWN,234 [26] = KEY_UNKNOWN,235 [27] = KEY_SWITCHVIDEOMODE,236 [28] = KEY_UNKNOWN,237 [29] = KEY_UNKNOWN,238 [30] = KEY_PROG2,239 [31] = KEY_UNKNOWN,240 [32] = KEY_UNKNOWN,241 [33] = KEY_UNKNOWN,242 [34] = KEY_UNKNOWN,243 [35] = KEY_UNKNOWN,244 [36] = KEY_UNKNOWN,245 [37] = KEY_UNKNOWN,246 [38] = KEY_MICMUTE,247 [255] = KEY_PROG3,248};249 250/*251 * Keymap for WMI events of type 0x0010252 *253 * These are applied if the 0xB2 DMI hotkey table is present and doesn't254 * override them.255 */256static const struct key_entry dell_wmi_keymap_type_0010[] = {257 /* Fn-lock switched to function keys */258 { KE_IGNORE, 0x0, { KEY_RESERVED } },259 260 /* Fn-lock switched to multimedia keys */261 { KE_IGNORE, 0x1, { KEY_RESERVED } },262 263 /* Keyboard backlight change notification */264 { KE_IGNORE, 0x3f, { KEY_RESERVED } },265 266 /* Backlight brightness level */267 { KE_KEY, 0x57, { KEY_BRIGHTNESSDOWN } },268 { KE_KEY, 0x58, { KEY_BRIGHTNESSUP } },269 270 /*Speaker Mute*/271 { KE_KEY, 0x109, { KEY_MUTE} },272 273 /* S2Idle screen off */274 { KE_IGNORE, 0x120, { KEY_RESERVED }},275 276 /* Leaving S4 or S2Idle suspend */277 { KE_IGNORE, 0x130, { KEY_RESERVED }},278 279 /* Entering S2Idle suspend */280 { KE_IGNORE, 0x140, { KEY_RESERVED }},281 282 /* Mic mute */283 { KE_KEY, 0x150, { KEY_MICMUTE } },284 285 /* Fn-lock */286 { KE_IGNORE, 0x151, { KEY_RESERVED } },287 288 /* Change keyboard illumination */289 { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } },290 291 /*292 * Radio disable (notify only -- there is no model for which the293 * WMI event is supposed to trigger an action).294 */295 { KE_IGNORE, 0x153, { KEY_RFKILL } },296 297 /* RGB keyboard backlight control */298 { KE_IGNORE, 0x154, { KEY_RESERVED } },299 300 /*301 * Stealth mode toggle. This will "disable all lights and sounds".302 * The action is performed by the BIOS and EC; the WMI event is just303 * a notification. On the XPS 13 9350, this is Fn+F7, and there's304 * a BIOS setting to enable and disable the hotkey.305 */306 { KE_IGNORE, 0x155, { KEY_RESERVED } },307 308 /* Rugged magnetic dock attach/detach events */309 { KE_IGNORE, 0x156, { KEY_RESERVED } },310 { KE_IGNORE, 0x157, { KEY_RESERVED } },311 312 /* Rugged programmable (P1/P2/P3 keys) */313 { KE_KEY, 0x850, { KEY_PROG1 } },314 { KE_KEY, 0x851, { KEY_PROG2 } },315 { KE_KEY, 0x852, { KEY_PROG3 } },316 317 /*318 * Radio disable (notify only -- there is no model for which the319 * WMI event is supposed to trigger an action).320 */321 { KE_IGNORE, 0xe008, { KEY_RFKILL } },322 323 /* Fn-lock */324 { KE_IGNORE, 0xe035, { KEY_RESERVED } },325};326 327/*328 * Keymap for WMI events of type 0x0011329 */330static const struct key_entry dell_wmi_keymap_type_0011[] = {331 /* Reflex keyboard switch on 2n1 devices */332 { KE_IGNORE, 0xe070, { KEY_RESERVED } },333 334 /* Battery unplugged */335 { KE_IGNORE, 0xfff0, { KEY_RESERVED } },336 337 /* Battery inserted */338 { KE_IGNORE, 0xfff1, { KEY_RESERVED } },339 340 /*341 * Detachable keyboard detached / undocked342 * Note SW_TABLET_MODE is already reported through the intel_vbtn343 * driver for this, so we ignore it.344 */345 { KE_IGNORE, 0xfff2, { KEY_RESERVED } },346 347 /* Detachable keyboard attached / docked */348 { KE_IGNORE, 0xfff3, { KEY_RESERVED } },349 350 /* Keyboard backlight level changed */351 { KE_IGNORE, KBD_LED_OFF_TOKEN, { KEY_RESERVED } },352 { KE_IGNORE, KBD_LED_ON_TOKEN, { KEY_RESERVED } },353 { KE_IGNORE, KBD_LED_AUTO_TOKEN, { KEY_RESERVED } },354 { KE_IGNORE, KBD_LED_AUTO_25_TOKEN, { KEY_RESERVED } },355 { KE_IGNORE, KBD_LED_AUTO_50_TOKEN, { KEY_RESERVED } },356 { KE_IGNORE, KBD_LED_AUTO_75_TOKEN, { KEY_RESERVED } },357 { KE_IGNORE, KBD_LED_AUTO_100_TOKEN, { KEY_RESERVED } },358};359 360/*361 * Keymap for WMI events of type 0x0012362 * They are events with extended data363 */364static const struct key_entry dell_wmi_keymap_type_0012[] = {365 /* Backlight brightness change event */366 { KE_IGNORE, 0x0003, { KEY_RESERVED } },367 368 /* Ultra-performance mode switch request */369 { KE_IGNORE, 0x000d, { KEY_RESERVED } },370 371 /* Fn-lock button pressed */372 { KE_IGNORE, 0xe035, { KEY_RESERVED } },373};374 375static void dell_wmi_switch_event(struct input_dev **subdev,376 const char *devname,377 int switchid,378 int value)379{380 if (!*subdev) {381 struct input_dev *dev = input_allocate_device();382 383 if (!dev) {384 pr_warn("could not allocate device for %s\n", devname);385 return;386 }387 __set_bit(EV_SW, (dev)->evbit);388 __set_bit(switchid, (dev)->swbit);389 390 (dev)->name = devname;391 (dev)->id.bustype = BUS_HOST;392 if (input_register_device(dev)) {393 input_free_device(dev);394 pr_warn("could not register device for %s\n", devname);395 return;396 }397 *subdev = dev;398 }399 400 input_report_switch(*subdev, switchid, value);401 input_sync(*subdev);402}403 404static int dell_wmi_process_key(struct wmi_device *wdev, int type, int code, u16 *buffer, int remaining)405{406 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);407 const struct key_entry *key;408 int used = 0;409 int value = 1;410 411 key = sparse_keymap_entry_from_scancode(priv->input_dev,412 (type << 16) | code);413 if (!key) {414 pr_info("Unknown key with type 0x%04x and code 0x%04x pressed\n",415 type, code);416 return 0;417 }418 419 pr_debug("Key with type 0x%04x and code 0x%04x pressed\n", type, code);420 421 /* Don't report brightness notifications that will also come via ACPI */422 if ((key->keycode == KEY_BRIGHTNESSUP ||423 key->keycode == KEY_BRIGHTNESSDOWN) &&424 acpi_video_handles_brightness_key_presses())425 return 0;426 427 if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request)428 return 0;429 430 if (key->keycode == KEY_KBDILLUMTOGGLE) {431 dell_laptop_call_notifier(432 DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED, NULL);433 } else if (type == 0x0011 && code == 0xe070 && remaining > 0) {434 dell_wmi_switch_event(&priv->tabletswitch_dev,435 "Dell tablet mode switch",436 SW_TABLET_MODE, !buffer[0]);437 return 1;438 } else if (type == 0x0012 && code == 0x000d && remaining > 0) {439 value = (buffer[2] == 2);440 used = 1;441 }442 443 sparse_keymap_report_entry(priv->input_dev, key, value, true);444 445 return used;446}447 448static void dell_wmi_notify(struct wmi_device *wdev,449 union acpi_object *obj)450{451 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);452 u16 *buffer_entry, *buffer_end;453 acpi_size buffer_size;454 int len, i;455 456 if (obj->type != ACPI_TYPE_BUFFER) {457 pr_warn("bad response type %x\n", obj->type);458 return;459 }460 461 pr_debug("Received WMI event (%*ph)\n",462 obj->buffer.length, obj->buffer.pointer);463 464 buffer_entry = (u16 *)obj->buffer.pointer;465 buffer_size = obj->buffer.length/2;466 buffer_end = buffer_entry + buffer_size;467 468 /*469 * BIOS/ACPI on devices with WMI interface version 0 does not clear470 * buffer before filling it. So next time when BIOS/ACPI send WMI event471 * which is smaller as previous then it contains garbage in buffer from472 * previous event.473 *474 * BIOS/ACPI on devices with WMI interface version 1 clears buffer and475 * sometimes send more events in buffer at one call.476 *477 * So to prevent reading garbage from buffer we will process only first478 * one event on devices with WMI interface version 0.479 */480 if (priv->interface_version == 0 && buffer_entry < buffer_end)481 if (buffer_end > buffer_entry + buffer_entry[0] + 1)482 buffer_end = buffer_entry + buffer_entry[0] + 1;483 484 while (buffer_entry < buffer_end) {485 486 len = buffer_entry[0];487 if (len == 0)488 break;489 490 len++;491 492 if (buffer_entry + len > buffer_end) {493 pr_warn("Invalid length of WMI event\n");494 break;495 }496 497 pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry);498 499 switch (buffer_entry[1]) {500 case 0x0000: /* One key pressed or event occurred */501 if (len > 2)502 dell_wmi_process_key(wdev, buffer_entry[1],503 buffer_entry[2],504 buffer_entry + 3,505 len - 3);506 /* Extended data is currently ignored */507 break;508 case 0x0010: /* Sequence of keys pressed */509 case 0x0011: /* Sequence of events occurred */510 for (i = 2; i < len; ++i)511 i += dell_wmi_process_key(wdev, buffer_entry[1],512 buffer_entry[i],513 buffer_entry + i,514 len - i - 1);515 break;516 case 0x0012:517 if ((len > 4) && dell_privacy_process_event(buffer_entry[1], buffer_entry[3],518 buffer_entry[4]))519 /* dell_privacy_process_event has handled the event */;520 else if (len > 2)521 dell_wmi_process_key(wdev, buffer_entry[1], buffer_entry[2],522 buffer_entry + 3, len - 3);523 break;524 default: /* Unknown event */525 pr_info("Unknown WMI event type 0x%x\n",526 (int)buffer_entry[1]);527 break;528 }529 530 buffer_entry += len;531 532 }533 534}535 536static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len)537{538 int i;539 540 for (i = 0; i < len; i++)541 if (keymap[i].code == scancode)542 return true;543 544 return false;545}546 547static void handle_dmi_entry(const struct dmi_header *dm, void *opaque)548{549 struct dell_dmi_results *results = opaque;550 struct dell_bios_hotkey_table *table;551 int hotkey_num, i, pos = 0;552 struct key_entry *keymap;553 554 if (results->err || results->keymap)555 return; /* We already found the hotkey table. */556 557 /* The Dell hotkey table is type 0xB2. Scan until we find it. */558 if (dm->type != 0xb2)559 return;560 561 table = container_of(dm, struct dell_bios_hotkey_table, header);562 563 hotkey_num = (table->header.length -564 sizeof(struct dell_bios_hotkey_table)) /565 sizeof(struct dell_bios_keymap_entry);566 if (hotkey_num < 1) {567 /*568 * Historically, dell-wmi would ignore a DMI entry of569 * fewer than 7 bytes. Sizes between 4 and 8 bytes are570 * nonsensical (both the header and all entries are 4571 * bytes), so we approximate the old behavior by572 * ignoring tables with fewer than one entry.573 */574 return;575 }576 577 keymap = kcalloc(hotkey_num, sizeof(struct key_entry), GFP_KERNEL);578 if (!keymap) {579 results->err = -ENOMEM;580 return;581 }582 583 for (i = 0; i < hotkey_num; i++) {584 const struct dell_bios_keymap_entry *bios_entry =585 &table->keymap[i];586 587 /* Uninitialized entries are 0 aka KEY_RESERVED. */588 u16 keycode = (bios_entry->keycode <589 ARRAY_SIZE(bios_to_linux_keycode)) ?590 bios_to_linux_keycode[bios_entry->keycode] :591 (bios_entry->keycode == 0xffff ? KEY_UNKNOWN : KEY_RESERVED);592 593 /*594 * Log if we find an entry in the DMI table that we don't595 * understand. If this happens, we should figure out what596 * the entry means and add it to bios_to_linux_keycode.597 */598 if (keycode == KEY_RESERVED) {599 pr_info("firmware scancode 0x%x maps to unrecognized keycode 0x%x\n",600 bios_entry->scancode, bios_entry->keycode);601 continue;602 }603 604 if (keycode == KEY_KBDILLUMTOGGLE)605 keymap[pos].type = KE_IGNORE;606 else607 keymap[pos].type = KE_KEY;608 keymap[pos].code = bios_entry->scancode;609 keymap[pos].keycode = keycode;610 611 pos++;612 }613 614 results->keymap = keymap;615 results->keymap_size = pos;616}617 618static int dell_wmi_input_setup(struct wmi_device *wdev)619{620 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);621 struct dell_dmi_results dmi_results = {};622 struct key_entry *keymap;623 int err, i, pos = 0;624 625 priv->input_dev = input_allocate_device();626 if (!priv->input_dev)627 return -ENOMEM;628 629 priv->input_dev->name = "Dell WMI hotkeys";630 priv->input_dev->id.bustype = BUS_HOST;631 priv->input_dev->dev.parent = &wdev->dev;632 633 if (dmi_walk(handle_dmi_entry, &dmi_results)) {634 /*635 * Historically, dell-wmi ignored dmi_walk errors. A failure636 * is certainly surprising, but it probably just indicates637 * a very old laptop.638 */639 pr_warn("no DMI; using the old-style hotkey interface\n");640 }641 642 if (dmi_results.err) {643 err = dmi_results.err;644 goto err_free_dev;645 }646 647 keymap = kcalloc(dmi_results.keymap_size +648 ARRAY_SIZE(dell_wmi_keymap_type_0000) +649 ARRAY_SIZE(dell_wmi_keymap_type_0010) +650 ARRAY_SIZE(dell_wmi_keymap_type_0011) +651 ARRAY_SIZE(dell_wmi_keymap_type_0012) +652 1,653 sizeof(struct key_entry), GFP_KERNEL);654 if (!keymap) {655 kfree(dmi_results.keymap);656 err = -ENOMEM;657 goto err_free_dev;658 }659 660 /* Append table with events of type 0x0010 which comes from DMI */661 for (i = 0; i < dmi_results.keymap_size; i++) {662 keymap[pos] = dmi_results.keymap[i];663 keymap[pos].code |= (0x0010 << 16);664 pos++;665 }666 667 kfree(dmi_results.keymap);668 669 /* Append table with extra events of type 0x0010 which are not in DMI */670 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0010); i++) {671 const struct key_entry *entry = &dell_wmi_keymap_type_0010[i];672 673 /*674 * Check if we've already found this scancode. This takes675 * quadratic time, but it doesn't matter unless the list676 * of extra keys gets very long.677 */678 if (dmi_results.keymap_size &&679 have_scancode(entry->code | (0x0010 << 16),680 keymap, dmi_results.keymap_size)681 )682 continue;683 684 keymap[pos] = *entry;685 keymap[pos].code |= (0x0010 << 16);686 pos++;687 }688 689 /* Append table with events of type 0x0011 */690 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0011); i++) {691 keymap[pos] = dell_wmi_keymap_type_0011[i];692 keymap[pos].code |= (0x0011 << 16);693 pos++;694 }695 696 /* Append table with events of type 0x0012 */697 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0012); i++) {698 keymap[pos] = dell_wmi_keymap_type_0012[i];699 keymap[pos].code |= (0x0012 << 16);700 pos++;701 }702 703 /*704 * Now append also table with "legacy" events of type 0x0000. Some of705 * them are reported also on laptops which have scancodes in DMI.706 */707 for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0000); i++) {708 keymap[pos] = dell_wmi_keymap_type_0000[i];709 pos++;710 }711 712 keymap[pos].type = KE_END;713 714 err = sparse_keymap_setup(priv->input_dev, keymap, NULL);715 /*716 * Sparse keymap library makes a copy of keymap so we don't need the717 * original one that was allocated.718 */719 kfree(keymap);720 if (err)721 goto err_free_dev;722 723 err = input_register_device(priv->input_dev);724 if (err)725 goto err_free_dev;726 727 return 0;728 729 err_free_dev:730 input_free_device(priv->input_dev);731 return err;732}733 734static void dell_wmi_input_destroy(struct wmi_device *wdev)735{736 struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);737 738 input_unregister_device(priv->input_dev);739 if (priv->tabletswitch_dev)740 input_unregister_device(priv->tabletswitch_dev);741}742 743/*744 * According to Dell SMBIOS documentation:745 *746 * 17 3 Application Program Registration747 *748 * cbArg1 Application ID 1 = 0x00010000749 * cbArg2 Application ID 2750 * QUICKSET/DCP = 0x51534554 "QSET"751 * ALS Driver = 0x416c7353 "AlsS"752 * Latitude ON = 0x4c6f6e52 "LonR"753 * cbArg3 Application version or revision number754 * cbArg4 0 = Unregister application755 * 1 = Register application756 * cbRes1 Standard return codes (0, -1, -2)757 */758 759static int dell_wmi_events_set_enabled(bool enable)760{761 struct calling_interface_buffer *buffer;762 int ret;763 764 buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);765 if (!buffer)766 return -ENOMEM;767 buffer->cmd_class = CLASS_INFO;768 buffer->cmd_select = SELECT_APP_REGISTRATION;769 buffer->input[0] = 0x10000;770 buffer->input[1] = 0x51534554;771 buffer->input[3] = enable;772 ret = dell_smbios_call(buffer);773 if (ret == 0)774 ret = buffer->output[0];775 kfree(buffer);776 777 return dell_smbios_error(ret);778}779 780static int dell_wmi_probe(struct wmi_device *wdev, const void *context)781{782 struct dell_wmi_priv *priv;783 int ret;784 785 ret = dell_wmi_get_descriptor_valid();786 if (ret)787 return ret;788 789 priv = devm_kzalloc(790 &wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL);791 if (!priv)792 return -ENOMEM;793 dev_set_drvdata(&wdev->dev, priv);794 795 if (!dell_wmi_get_interface_version(&priv->interface_version))796 return -EPROBE_DEFER;797 798 return dell_wmi_input_setup(wdev);799}800 801static void dell_wmi_remove(struct wmi_device *wdev)802{803 dell_wmi_input_destroy(wdev);804}805static const struct wmi_device_id dell_wmi_id_table[] = {806 { .guid_string = DELL_EVENT_GUID },807 { },808};809 810static struct wmi_driver dell_wmi_driver = {811 .driver = {812 .name = "dell-wmi",813 },814 .id_table = dell_wmi_id_table,815 .probe = dell_wmi_probe,816 .remove = dell_wmi_remove,817 .notify = dell_wmi_notify,818};819 820static int __init dell_wmi_init(void)821{822 int err;823 824 dmi_check_system(dell_wmi_smbios_list);825 826 if (wmi_requires_smbios_request) {827 err = dell_wmi_events_set_enabled(true);828 if (err) {829 pr_err("Failed to enable WMI events\n");830 return err;831 }832 }833 834 err = dell_privacy_register_driver();835 if (err)836 return err;837 838 return wmi_driver_register(&dell_wmi_driver);839}840late_initcall(dell_wmi_init);841 842static void __exit dell_wmi_exit(void)843{844 if (wmi_requires_smbios_request)845 dell_wmi_events_set_enabled(false);846 847 wmi_driver_unregister(&dell_wmi_driver);848 dell_privacy_unregister_driver();849}850module_exit(dell_wmi_exit);851 852MODULE_DEVICE_TABLE(wmi, dell_wmi_id_table);853