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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Dell WMI hotkeys
0004  *
0005  * Copyright (C) 2008 Red Hat <mjg@redhat.com>
0006  * Copyright (C) 2014-2015 Pali Rohár <pali@kernel.org>
0007  *
0008  * Portions based on wistron_btns.c:
0009  * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
0010  * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
0011  * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
0012  */
0013 
0014 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0015 
0016 #include <linux/kernel.h>
0017 #include <linux/module.h>
0018 #include <linux/init.h>
0019 #include <linux/slab.h>
0020 #include <linux/types.h>
0021 #include <linux/input.h>
0022 #include <linux/input/sparse-keymap.h>
0023 #include <linux/acpi.h>
0024 #include <linux/string.h>
0025 #include <linux/dmi.h>
0026 #include <linux/wmi.h>
0027 #include <acpi/video.h>
0028 #include "dell-smbios.h"
0029 #include "dell-wmi-descriptor.h"
0030 #include "dell-wmi-privacy.h"
0031 
0032 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
0033 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
0034 MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
0035 MODULE_LICENSE("GPL");
0036 
0037 #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
0038 
0039 static bool wmi_requires_smbios_request;
0040 
0041 struct dell_wmi_priv {
0042     struct input_dev *input_dev;
0043     struct input_dev *tabletswitch_dev;
0044     u32 interface_version;
0045 };
0046 
0047 static int __init dmi_matched(const struct dmi_system_id *dmi)
0048 {
0049     wmi_requires_smbios_request = 1;
0050     return 1;
0051 }
0052 
0053 static const struct dmi_system_id dell_wmi_smbios_list[] __initconst = {
0054     {
0055         .callback = dmi_matched,
0056         .ident = "Dell Inspiron M5110",
0057         .matches = {
0058             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0059             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
0060         },
0061     },
0062     {
0063         .callback = dmi_matched,
0064         .ident = "Dell Vostro V131",
0065         .matches = {
0066             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0067             DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
0068         },
0069     },
0070     { }
0071 };
0072 
0073 /*
0074  * Keymap for WMI events of type 0x0000
0075  *
0076  * Certain keys are flagged as KE_IGNORE. All of these are either
0077  * notifications (rather than requests for change) or are also sent
0078  * via the keyboard controller so should not be sent again.
0079  */
0080 static const struct key_entry dell_wmi_keymap_type_0000[] = {
0081     { KE_IGNORE, 0x003a, { KEY_CAPSLOCK } },
0082 
0083     /* Key code is followed by brightness level */
0084     { KE_KEY,    0xe005, { KEY_BRIGHTNESSDOWN } },
0085     { KE_KEY,    0xe006, { KEY_BRIGHTNESSUP } },
0086 
0087     /* Battery health status button */
0088     { KE_KEY,    0xe007, { KEY_BATTERY } },
0089 
0090     /* Radio devices state change, key code is followed by other values */
0091     { KE_IGNORE, 0xe008, { KEY_RFKILL } },
0092 
0093     { KE_KEY,    0xe009, { KEY_EJECTCD } },
0094 
0095     /* Key code is followed by: next, active and attached devices */
0096     { KE_KEY,    0xe00b, { KEY_SWITCHVIDEOMODE } },
0097 
0098     /* Key code is followed by keyboard illumination level */
0099     { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } },
0100 
0101     /* BIOS error detected */
0102     { KE_IGNORE, 0xe00d, { KEY_RESERVED } },
0103 
0104     /* Battery was removed or inserted */
0105     { KE_IGNORE, 0xe00e, { KEY_RESERVED } },
0106 
0107     /* Wifi Catcher */
0108     { KE_KEY,    0xe011, { KEY_WLAN } },
0109 
0110     /* Ambient light sensor toggle */
0111     { KE_IGNORE, 0xe013, { KEY_RESERVED } },
0112 
0113     { KE_IGNORE, 0xe020, { KEY_MUTE } },
0114 
0115     /* Unknown, defined in ACPI DSDT */
0116     /* { KE_IGNORE, 0xe023, { KEY_RESERVED } }, */
0117 
0118     /* Untested, Dell Instant Launch key on Inspiron 7520 */
0119     /* { KE_IGNORE, 0xe024, { KEY_RESERVED } }, */
0120 
0121     /* Dell Instant Launch key */
0122     { KE_KEY,    0xe025, { KEY_PROG4 } },
0123 
0124     /* Audio panel key */
0125     { KE_IGNORE, 0xe026, { KEY_RESERVED } },
0126 
0127     /* LCD Display On/Off Control key */
0128     { KE_KEY,    0xe027, { KEY_DISPLAYTOGGLE } },
0129 
0130     /* Untested, Multimedia key on Dell Vostro 3560 */
0131     /* { KE_IGNORE, 0xe028, { KEY_RESERVED } }, */
0132 
0133     /* Dell Instant Launch key */
0134     { KE_KEY,    0xe029, { KEY_PROG4 } },
0135 
0136     /* Untested, Windows Mobility Center button on Inspiron 7520 */
0137     /* { KE_IGNORE, 0xe02a, { KEY_RESERVED } }, */
0138 
0139     /* Unknown, defined in ACPI DSDT */
0140     /* { KE_IGNORE, 0xe02b, { KEY_RESERVED } }, */
0141 
0142     /* Untested, Dell Audio With Preset Switch button on Inspiron 7520 */
0143     /* { KE_IGNORE, 0xe02c, { KEY_RESERVED } }, */
0144 
0145     { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } },
0146     { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } },
0147     { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } },
0148     { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } },
0149     { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } },
0150 
0151     /* NIC Link is Up */
0152     { KE_IGNORE, 0xe043, { KEY_RESERVED } },
0153 
0154     /* NIC Link is Down */
0155     { KE_IGNORE, 0xe044, { KEY_RESERVED } },
0156 
0157     /*
0158      * This entry is very suspicious!
0159      * Originally Matthew Garrett created this dell-wmi driver specially for
0160      * "button with a picture of a battery" which has event code 0xe045.
0161      * Later Mario Limonciello from Dell told us that event code 0xe045 is
0162      * reported by Num Lock and should be ignored because key is send also
0163      * by keyboard controller.
0164      * So for now we will ignore this event to prevent potential double
0165      * Num Lock key press.
0166      */
0167     { KE_IGNORE, 0xe045, { KEY_NUMLOCK } },
0168 
0169     /* Scroll lock and also going to tablet mode on portable devices */
0170     { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } },
0171 
0172     /* Untested, going from tablet mode on portable devices */
0173     /* { KE_IGNORE, 0xe047, { KEY_RESERVED } }, */
0174 
0175     /* Dell Support Center key */
0176     { KE_IGNORE, 0xe06e, { KEY_RESERVED } },
0177 
0178     { KE_IGNORE, 0xe0f7, { KEY_MUTE } },
0179     { KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } },
0180     { KE_IGNORE, 0xe0f9, { KEY_VOLUMEUP } },
0181 };
0182 
0183 struct dell_bios_keymap_entry {
0184     u16 scancode;
0185     u16 keycode;
0186 };
0187 
0188 struct dell_bios_hotkey_table {
0189     struct dmi_header header;
0190     struct dell_bios_keymap_entry keymap[];
0191 
0192 };
0193 
0194 struct dell_dmi_results {
0195     int err;
0196     int keymap_size;
0197     struct key_entry *keymap;
0198 };
0199 
0200 /* Uninitialized entries here are KEY_RESERVED == 0. */
0201 static const u16 bios_to_linux_keycode[256] = {
0202     [0] = KEY_MEDIA,
0203     [1] = KEY_NEXTSONG,
0204     [2] = KEY_PLAYPAUSE,
0205     [3] = KEY_PREVIOUSSONG,
0206     [4] = KEY_STOPCD,
0207     [5] = KEY_UNKNOWN,
0208     [6] = KEY_UNKNOWN,
0209     [7] = KEY_UNKNOWN,
0210     [8] = KEY_WWW,
0211     [9] = KEY_UNKNOWN,
0212     [10]    = KEY_VOLUMEDOWN,
0213     [11]    = KEY_MUTE,
0214     [12]    = KEY_VOLUMEUP,
0215     [13]    = KEY_UNKNOWN,
0216     [14]    = KEY_BATTERY,
0217     [15]    = KEY_EJECTCD,
0218     [16]    = KEY_UNKNOWN,
0219     [17]    = KEY_SLEEP,
0220     [18]    = KEY_PROG1,
0221     [19]    = KEY_BRIGHTNESSDOWN,
0222     [20]    = KEY_BRIGHTNESSUP,
0223     [21]    = KEY_BRIGHTNESS_AUTO,
0224     [22]    = KEY_KBDILLUMTOGGLE,
0225     [23]    = KEY_UNKNOWN,
0226     [24]    = KEY_SWITCHVIDEOMODE,
0227     [25]    = KEY_UNKNOWN,
0228     [26]    = KEY_UNKNOWN,
0229     [27]    = KEY_SWITCHVIDEOMODE,
0230     [28]    = KEY_UNKNOWN,
0231     [29]    = KEY_UNKNOWN,
0232     [30]    = KEY_PROG2,
0233     [31]    = KEY_UNKNOWN,
0234     [32]    = KEY_UNKNOWN,
0235     [33]    = KEY_UNKNOWN,
0236     [34]    = KEY_UNKNOWN,
0237     [35]    = KEY_UNKNOWN,
0238     [36]    = KEY_UNKNOWN,
0239     [37]    = KEY_UNKNOWN,
0240     [38]    = KEY_MICMUTE,
0241     [255]   = KEY_PROG3,
0242 };
0243 
0244 /*
0245  * Keymap for WMI events of type 0x0010
0246  *
0247  * These are applied if the 0xB2 DMI hotkey table is present and doesn't
0248  * override them.
0249  */
0250 static const struct key_entry dell_wmi_keymap_type_0010[] = {
0251     /* Fn-lock switched to function keys */
0252     { KE_IGNORE, 0x0, { KEY_RESERVED } },
0253 
0254     /* Fn-lock switched to multimedia keys */
0255     { KE_IGNORE, 0x1, { KEY_RESERVED } },
0256 
0257     /* Keyboard backlight change notification */
0258     { KE_IGNORE, 0x3f, { KEY_RESERVED } },
0259 
0260     /* Backlight brightness level */
0261     { KE_KEY,    0x57, { KEY_BRIGHTNESSDOWN } },
0262     { KE_KEY,    0x58, { KEY_BRIGHTNESSUP } },
0263 
0264     /* Mic mute */
0265     { KE_KEY, 0x150, { KEY_MICMUTE } },
0266 
0267     /* Fn-lock */
0268     { KE_IGNORE, 0x151, { KEY_RESERVED } },
0269 
0270     /* Change keyboard illumination */
0271     { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } },
0272 
0273     /*
0274      * Radio disable (notify only -- there is no model for which the
0275      * WMI event is supposed to trigger an action).
0276      */
0277     { KE_IGNORE, 0x153, { KEY_RFKILL } },
0278 
0279     /* RGB keyboard backlight control */
0280     { KE_IGNORE, 0x154, { KEY_RESERVED } },
0281 
0282     /*
0283      * Stealth mode toggle. This will "disable all lights and sounds".
0284      * The action is performed by the BIOS and EC; the WMI event is just
0285      * a notification. On the XPS 13 9350, this is Fn+F7, and there's
0286      * a BIOS setting to enable and disable the hotkey.
0287      */
0288     { KE_IGNORE, 0x155, { KEY_RESERVED } },
0289 
0290     /* Rugged magnetic dock attach/detach events */
0291     { KE_IGNORE, 0x156, { KEY_RESERVED } },
0292     { KE_IGNORE, 0x157, { KEY_RESERVED } },
0293 
0294     /* Rugged programmable (P1/P2/P3 keys) */
0295     { KE_KEY,    0x850, { KEY_PROG1 } },
0296     { KE_KEY,    0x851, { KEY_PROG2 } },
0297     { KE_KEY,    0x852, { KEY_PROG3 } },
0298 
0299     /*
0300      * Radio disable (notify only -- there is no model for which the
0301      * WMI event is supposed to trigger an action).
0302      */
0303     { KE_IGNORE, 0xe008, { KEY_RFKILL } },
0304 
0305     /* Fn-lock */
0306     { KE_IGNORE, 0xe035, { KEY_RESERVED } },
0307 };
0308 
0309 /*
0310  * Keymap for WMI events of type 0x0011
0311  */
0312 static const struct key_entry dell_wmi_keymap_type_0011[] = {
0313     /* Reflex keyboard switch on 2n1 devices */
0314     { KE_IGNORE, 0xe070, { KEY_RESERVED } },
0315 
0316     /* Battery unplugged */
0317     { KE_IGNORE, 0xfff0, { KEY_RESERVED } },
0318 
0319     /* Battery inserted */
0320     { KE_IGNORE, 0xfff1, { KEY_RESERVED } },
0321 
0322     /*
0323      * Detachable keyboard detached / undocked
0324      * Note SW_TABLET_MODE is already reported through the intel_vbtn
0325      * driver for this, so we ignore it.
0326      */
0327     { KE_IGNORE, 0xfff2, { KEY_RESERVED } },
0328 
0329     /* Detachable keyboard attached / docked */
0330     { KE_IGNORE, 0xfff3, { KEY_RESERVED } },
0331 
0332     /* Keyboard backlight level changed */
0333     { KE_IGNORE, KBD_LED_OFF_TOKEN,      { KEY_RESERVED } },
0334     { KE_IGNORE, KBD_LED_ON_TOKEN,       { KEY_RESERVED } },
0335     { KE_IGNORE, KBD_LED_AUTO_TOKEN,     { KEY_RESERVED } },
0336     { KE_IGNORE, KBD_LED_AUTO_25_TOKEN,  { KEY_RESERVED } },
0337     { KE_IGNORE, KBD_LED_AUTO_50_TOKEN,  { KEY_RESERVED } },
0338     { KE_IGNORE, KBD_LED_AUTO_75_TOKEN,  { KEY_RESERVED } },
0339     { KE_IGNORE, KBD_LED_AUTO_100_TOKEN, { KEY_RESERVED } },
0340 };
0341 
0342 /*
0343  * Keymap for WMI events of type 0x0012
0344  * They are events with extended data
0345  */
0346 static const struct key_entry dell_wmi_keymap_type_0012[] = {
0347     /* Ultra-performance mode switch request */
0348     { KE_IGNORE, 0x000d, { KEY_RESERVED } },
0349 
0350     /* Fn-lock button pressed */
0351     { KE_IGNORE, 0xe035, { KEY_RESERVED } },
0352 };
0353 
0354 static void dell_wmi_switch_event(struct input_dev **subdev,
0355                   const char *devname,
0356                   int switchid,
0357                   int value)
0358 {
0359     if (!*subdev) {
0360         struct input_dev *dev = input_allocate_device();
0361 
0362         if (!dev) {
0363             pr_warn("could not allocate device for %s\n", devname);
0364             return;
0365         }
0366         __set_bit(EV_SW, (dev)->evbit);
0367         __set_bit(switchid, (dev)->swbit);
0368 
0369         (dev)->name = devname;
0370         (dev)->id.bustype = BUS_HOST;
0371         if (input_register_device(dev)) {
0372             input_free_device(dev);
0373             pr_warn("could not register device for %s\n", devname);
0374             return;
0375         }
0376         *subdev = dev;
0377     }
0378 
0379     input_report_switch(*subdev, switchid, value);
0380     input_sync(*subdev);
0381 }
0382 
0383 static int dell_wmi_process_key(struct wmi_device *wdev, int type, int code, u16 *buffer, int remaining)
0384 {
0385     struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
0386     const struct key_entry *key;
0387     int used = 0;
0388     int value = 1;
0389 
0390     key = sparse_keymap_entry_from_scancode(priv->input_dev,
0391                         (type << 16) | code);
0392     if (!key) {
0393         pr_info("Unknown key with type 0x%04x and code 0x%04x pressed\n",
0394             type, code);
0395         return 0;
0396     }
0397 
0398     pr_debug("Key with type 0x%04x and code 0x%04x pressed\n", type, code);
0399 
0400     /* Don't report brightness notifications that will also come via ACPI */
0401     if ((key->keycode == KEY_BRIGHTNESSUP ||
0402          key->keycode == KEY_BRIGHTNESSDOWN) &&
0403         acpi_video_handles_brightness_key_presses())
0404         return 0;
0405 
0406     if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request)
0407         return 0;
0408 
0409     if (key->keycode == KEY_KBDILLUMTOGGLE) {
0410         dell_laptop_call_notifier(
0411             DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED, NULL);
0412     } else if (type == 0x0011 && code == 0xe070 && remaining > 0) {
0413         dell_wmi_switch_event(&priv->tabletswitch_dev,
0414                       "Dell tablet mode switch",
0415                       SW_TABLET_MODE, !buffer[0]);
0416         return 1;
0417     } else if (type == 0x0012 && code == 0x000d && remaining > 0) {
0418         value = (buffer[2] == 2);
0419         used = 1;
0420     }
0421 
0422     sparse_keymap_report_entry(priv->input_dev, key, value, true);
0423 
0424     return used;
0425 }
0426 
0427 static void dell_wmi_notify(struct wmi_device *wdev,
0428                 union acpi_object *obj)
0429 {
0430     struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
0431     u16 *buffer_entry, *buffer_end;
0432     acpi_size buffer_size;
0433     int len, i;
0434 
0435     if (obj->type != ACPI_TYPE_BUFFER) {
0436         pr_warn("bad response type %x\n", obj->type);
0437         return;
0438     }
0439 
0440     pr_debug("Received WMI event (%*ph)\n",
0441         obj->buffer.length, obj->buffer.pointer);
0442 
0443     buffer_entry = (u16 *)obj->buffer.pointer;
0444     buffer_size = obj->buffer.length/2;
0445     buffer_end = buffer_entry + buffer_size;
0446 
0447     /*
0448      * BIOS/ACPI on devices with WMI interface version 0 does not clear
0449      * buffer before filling it. So next time when BIOS/ACPI send WMI event
0450      * which is smaller as previous then it contains garbage in buffer from
0451      * previous event.
0452      *
0453      * BIOS/ACPI on devices with WMI interface version 1 clears buffer and
0454      * sometimes send more events in buffer at one call.
0455      *
0456      * So to prevent reading garbage from buffer we will process only first
0457      * one event on devices with WMI interface version 0.
0458      */
0459     if (priv->interface_version == 0 && buffer_entry < buffer_end)
0460         if (buffer_end > buffer_entry + buffer_entry[0] + 1)
0461             buffer_end = buffer_entry + buffer_entry[0] + 1;
0462 
0463     while (buffer_entry < buffer_end) {
0464 
0465         len = buffer_entry[0];
0466         if (len == 0)
0467             break;
0468 
0469         len++;
0470 
0471         if (buffer_entry + len > buffer_end) {
0472             pr_warn("Invalid length of WMI event\n");
0473             break;
0474         }
0475 
0476         pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry);
0477 
0478         switch (buffer_entry[1]) {
0479         case 0x0000: /* One key pressed or event occurred */
0480             if (len > 2)
0481                 dell_wmi_process_key(wdev, buffer_entry[1],
0482                              buffer_entry[2],
0483                              buffer_entry + 3,
0484                              len - 3);
0485             /* Extended data is currently ignored */
0486             break;
0487         case 0x0010: /* Sequence of keys pressed */
0488         case 0x0011: /* Sequence of events occurred */
0489             for (i = 2; i < len; ++i)
0490                 i += dell_wmi_process_key(wdev, buffer_entry[1],
0491                               buffer_entry[i],
0492                               buffer_entry + i,
0493                               len - i - 1);
0494             break;
0495         case 0x0012:
0496             if ((len > 4) && dell_privacy_process_event(buffer_entry[1], buffer_entry[3],
0497                                     buffer_entry[4]))
0498                 /* dell_privacy_process_event has handled the event */;
0499             else if (len > 2)
0500                 dell_wmi_process_key(wdev, buffer_entry[1], buffer_entry[2],
0501                              buffer_entry + 3, len - 3);
0502             break;
0503         default: /* Unknown event */
0504             pr_info("Unknown WMI event type 0x%x\n",
0505                 (int)buffer_entry[1]);
0506             break;
0507         }
0508 
0509         buffer_entry += len;
0510 
0511     }
0512 
0513 }
0514 
0515 static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len)
0516 {
0517     int i;
0518 
0519     for (i = 0; i < len; i++)
0520         if (keymap[i].code == scancode)
0521             return true;
0522 
0523     return false;
0524 }
0525 
0526 static void handle_dmi_entry(const struct dmi_header *dm, void *opaque)
0527 {
0528     struct dell_dmi_results *results = opaque;
0529     struct dell_bios_hotkey_table *table;
0530     int hotkey_num, i, pos = 0;
0531     struct key_entry *keymap;
0532 
0533     if (results->err || results->keymap)
0534         return;     /* We already found the hotkey table. */
0535 
0536     /* The Dell hotkey table is type 0xB2.  Scan until we find it. */
0537     if (dm->type != 0xb2)
0538         return;
0539 
0540     table = container_of(dm, struct dell_bios_hotkey_table, header);
0541 
0542     hotkey_num = (table->header.length -
0543               sizeof(struct dell_bios_hotkey_table)) /
0544                 sizeof(struct dell_bios_keymap_entry);
0545     if (hotkey_num < 1) {
0546         /*
0547          * Historically, dell-wmi would ignore a DMI entry of
0548          * fewer than 7 bytes.  Sizes between 4 and 8 bytes are
0549          * nonsensical (both the header and all entries are 4
0550          * bytes), so we approximate the old behavior by
0551          * ignoring tables with fewer than one entry.
0552          */
0553         return;
0554     }
0555 
0556     keymap = kcalloc(hotkey_num, sizeof(struct key_entry), GFP_KERNEL);
0557     if (!keymap) {
0558         results->err = -ENOMEM;
0559         return;
0560     }
0561 
0562     for (i = 0; i < hotkey_num; i++) {
0563         const struct dell_bios_keymap_entry *bios_entry =
0564                     &table->keymap[i];
0565 
0566         /* Uninitialized entries are 0 aka KEY_RESERVED. */
0567         u16 keycode = (bios_entry->keycode <
0568                    ARRAY_SIZE(bios_to_linux_keycode)) ?
0569             bios_to_linux_keycode[bios_entry->keycode] :
0570             (bios_entry->keycode == 0xffff ? KEY_UNKNOWN : KEY_RESERVED);
0571 
0572         /*
0573          * Log if we find an entry in the DMI table that we don't
0574          * understand.  If this happens, we should figure out what
0575          * the entry means and add it to bios_to_linux_keycode.
0576          */
0577         if (keycode == KEY_RESERVED) {
0578             pr_info("firmware scancode 0x%x maps to unrecognized keycode 0x%x\n",
0579                 bios_entry->scancode, bios_entry->keycode);
0580             continue;
0581         }
0582 
0583         if (keycode == KEY_KBDILLUMTOGGLE)
0584             keymap[pos].type = KE_IGNORE;
0585         else
0586             keymap[pos].type = KE_KEY;
0587         keymap[pos].code = bios_entry->scancode;
0588         keymap[pos].keycode = keycode;
0589 
0590         pos++;
0591     }
0592 
0593     results->keymap = keymap;
0594     results->keymap_size = pos;
0595 }
0596 
0597 static int dell_wmi_input_setup(struct wmi_device *wdev)
0598 {
0599     struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
0600     struct dell_dmi_results dmi_results = {};
0601     struct key_entry *keymap;
0602     int err, i, pos = 0;
0603 
0604     priv->input_dev = input_allocate_device();
0605     if (!priv->input_dev)
0606         return -ENOMEM;
0607 
0608     priv->input_dev->name = "Dell WMI hotkeys";
0609     priv->input_dev->id.bustype = BUS_HOST;
0610     priv->input_dev->dev.parent = &wdev->dev;
0611 
0612     if (dmi_walk(handle_dmi_entry, &dmi_results)) {
0613         /*
0614          * Historically, dell-wmi ignored dmi_walk errors.  A failure
0615          * is certainly surprising, but it probably just indicates
0616          * a very old laptop.
0617          */
0618         pr_warn("no DMI; using the old-style hotkey interface\n");
0619     }
0620 
0621     if (dmi_results.err) {
0622         err = dmi_results.err;
0623         goto err_free_dev;
0624     }
0625 
0626     keymap = kcalloc(dmi_results.keymap_size +
0627              ARRAY_SIZE(dell_wmi_keymap_type_0000) +
0628              ARRAY_SIZE(dell_wmi_keymap_type_0010) +
0629              ARRAY_SIZE(dell_wmi_keymap_type_0011) +
0630              ARRAY_SIZE(dell_wmi_keymap_type_0012) +
0631              1,
0632              sizeof(struct key_entry), GFP_KERNEL);
0633     if (!keymap) {
0634         kfree(dmi_results.keymap);
0635         err = -ENOMEM;
0636         goto err_free_dev;
0637     }
0638 
0639     /* Append table with events of type 0x0010 which comes from DMI */
0640     for (i = 0; i < dmi_results.keymap_size; i++) {
0641         keymap[pos] = dmi_results.keymap[i];
0642         keymap[pos].code |= (0x0010 << 16);
0643         pos++;
0644     }
0645 
0646     kfree(dmi_results.keymap);
0647 
0648     /* Append table with extra events of type 0x0010 which are not in DMI */
0649     for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0010); i++) {
0650         const struct key_entry *entry = &dell_wmi_keymap_type_0010[i];
0651 
0652         /*
0653          * Check if we've already found this scancode.  This takes
0654          * quadratic time, but it doesn't matter unless the list
0655          * of extra keys gets very long.
0656          */
0657         if (dmi_results.keymap_size &&
0658             have_scancode(entry->code | (0x0010 << 16),
0659                   keymap, dmi_results.keymap_size)
0660            )
0661             continue;
0662 
0663         keymap[pos] = *entry;
0664         keymap[pos].code |= (0x0010 << 16);
0665         pos++;
0666     }
0667 
0668     /* Append table with events of type 0x0011 */
0669     for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0011); i++) {
0670         keymap[pos] = dell_wmi_keymap_type_0011[i];
0671         keymap[pos].code |= (0x0011 << 16);
0672         pos++;
0673     }
0674 
0675     /* Append table with events of type 0x0012 */
0676     for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0012); i++) {
0677         keymap[pos] = dell_wmi_keymap_type_0012[i];
0678         keymap[pos].code |= (0x0012 << 16);
0679         pos++;
0680     }
0681 
0682     /*
0683      * Now append also table with "legacy" events of type 0x0000. Some of
0684      * them are reported also on laptops which have scancodes in DMI.
0685      */
0686     for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0000); i++) {
0687         keymap[pos] = dell_wmi_keymap_type_0000[i];
0688         pos++;
0689     }
0690 
0691     keymap[pos].type = KE_END;
0692 
0693     err = sparse_keymap_setup(priv->input_dev, keymap, NULL);
0694     /*
0695      * Sparse keymap library makes a copy of keymap so we don't need the
0696      * original one that was allocated.
0697      */
0698     kfree(keymap);
0699     if (err)
0700         goto err_free_dev;
0701 
0702     err = input_register_device(priv->input_dev);
0703     if (err)
0704         goto err_free_dev;
0705 
0706     return 0;
0707 
0708  err_free_dev:
0709     input_free_device(priv->input_dev);
0710     return err;
0711 }
0712 
0713 static void dell_wmi_input_destroy(struct wmi_device *wdev)
0714 {
0715     struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
0716 
0717     input_unregister_device(priv->input_dev);
0718     if (priv->tabletswitch_dev)
0719         input_unregister_device(priv->tabletswitch_dev);
0720 }
0721 
0722 /*
0723  * According to Dell SMBIOS documentation:
0724  *
0725  * 17  3  Application Program Registration
0726  *
0727  *     cbArg1 Application ID 1 = 0x00010000
0728  *     cbArg2 Application ID 2
0729  *            QUICKSET/DCP = 0x51534554 "QSET"
0730  *            ALS Driver   = 0x416c7353 "AlsS"
0731  *            Latitude ON  = 0x4c6f6e52 "LonR"
0732  *     cbArg3 Application version or revision number
0733  *     cbArg4 0 = Unregister application
0734  *            1 = Register application
0735  *     cbRes1 Standard return codes (0, -1, -2)
0736  */
0737 
0738 static int dell_wmi_events_set_enabled(bool enable)
0739 {
0740     struct calling_interface_buffer *buffer;
0741     int ret;
0742 
0743     buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);
0744     if (!buffer)
0745         return -ENOMEM;
0746     buffer->cmd_class = CLASS_INFO;
0747     buffer->cmd_select = SELECT_APP_REGISTRATION;
0748     buffer->input[0] = 0x10000;
0749     buffer->input[1] = 0x51534554;
0750     buffer->input[3] = enable;
0751     ret = dell_smbios_call(buffer);
0752     if (ret == 0)
0753         ret = buffer->output[0];
0754     kfree(buffer);
0755 
0756     return dell_smbios_error(ret);
0757 }
0758 
0759 static int dell_wmi_probe(struct wmi_device *wdev, const void *context)
0760 {
0761     struct dell_wmi_priv *priv;
0762     int ret;
0763 
0764     ret = dell_wmi_get_descriptor_valid();
0765     if (ret)
0766         return ret;
0767 
0768     priv = devm_kzalloc(
0769         &wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL);
0770     if (!priv)
0771         return -ENOMEM;
0772     dev_set_drvdata(&wdev->dev, priv);
0773 
0774     if (!dell_wmi_get_interface_version(&priv->interface_version))
0775         return -EPROBE_DEFER;
0776 
0777     return dell_wmi_input_setup(wdev);
0778 }
0779 
0780 static void dell_wmi_remove(struct wmi_device *wdev)
0781 {
0782     dell_wmi_input_destroy(wdev);
0783 }
0784 static const struct wmi_device_id dell_wmi_id_table[] = {
0785     { .guid_string = DELL_EVENT_GUID },
0786     { },
0787 };
0788 
0789 static struct wmi_driver dell_wmi_driver = {
0790     .driver = {
0791         .name = "dell-wmi",
0792     },
0793     .id_table = dell_wmi_id_table,
0794     .probe = dell_wmi_probe,
0795     .remove = dell_wmi_remove,
0796     .notify = dell_wmi_notify,
0797 };
0798 
0799 static int __init dell_wmi_init(void)
0800 {
0801     int err;
0802 
0803     dmi_check_system(dell_wmi_smbios_list);
0804 
0805     if (wmi_requires_smbios_request) {
0806         err = dell_wmi_events_set_enabled(true);
0807         if (err) {
0808             pr_err("Failed to enable WMI events\n");
0809             return err;
0810         }
0811     }
0812 
0813     err = dell_privacy_register_driver();
0814     if (err)
0815         return err;
0816 
0817     return wmi_driver_register(&dell_wmi_driver);
0818 }
0819 late_initcall(dell_wmi_init);
0820 
0821 static void __exit dell_wmi_exit(void)
0822 {
0823     if (wmi_requires_smbios_request)
0824         dell_wmi_events_set_enabled(false);
0825 
0826     wmi_driver_unregister(&dell_wmi_driver);
0827     dell_privacy_unregister_driver();
0828 }
0829 module_exit(dell_wmi_exit);
0830 
0831 MODULE_DEVICE_TABLE(wmi, dell_wmi_id_table);
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