qemu/hw/input/hid.c
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   1/*
   2 * QEMU HID devices
   3 *
   4 * Copyright (c) 2005 Fabrice Bellard
   5 * Copyright (c) 2007 OpenMoko, Inc.  (andrew@openedhand.com)
   6 *
   7 * Permission is hereby granted, free of charge, to any person obtaining a copy
   8 * of this software and associated documentation files (the "Software"), to deal
   9 * in the Software without restriction, including without limitation the rights
  10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 * copies of the Software, and to permit persons to whom the Software is
  12 * furnished to do so, subject to the following conditions:
  13 *
  14 * The above copyright notice and this permission notice shall be included in
  15 * all copies or substantial portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23 * THE SOFTWARE.
  24 */
  25
  26#include "qemu/osdep.h"
  27#include "ui/console.h"
  28#include "qemu/timer.h"
  29#include "hw/input/hid.h"
  30#include "migration/vmstate.h"
  31#include "trace.h"
  32
  33#define HID_USAGE_ERROR_ROLLOVER        0x01
  34#define HID_USAGE_POSTFAIL              0x02
  35#define HID_USAGE_ERROR_UNDEFINED       0x03
  36
  37/* Indices are QEMU keycodes, values are from HID Usage Table.  Indices
  38 * above 0x80 are for keys that come after 0xe0 or 0xe1+0x1d or 0xe1+0x9d.  */
  39static const uint8_t hid_usage_keys[0x100] = {
  40    0x00, 0x29, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
  41    0x24, 0x25, 0x26, 0x27, 0x2d, 0x2e, 0x2a, 0x2b,
  42    0x14, 0x1a, 0x08, 0x15, 0x17, 0x1c, 0x18, 0x0c,
  43    0x12, 0x13, 0x2f, 0x30, 0x28, 0xe0, 0x04, 0x16,
  44    0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x0f, 0x33,
  45    0x34, 0x35, 0xe1, 0x31, 0x1d, 0x1b, 0x06, 0x19,
  46    0x05, 0x11, 0x10, 0x36, 0x37, 0x38, 0xe5, 0x55,
  47    0xe2, 0x2c, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
  48    0x3f, 0x40, 0x41, 0x42, 0x43, 0x53, 0x47, 0x5f,
  49    0x60, 0x61, 0x56, 0x5c, 0x5d, 0x5e, 0x57, 0x59,
  50    0x5a, 0x5b, 0x62, 0x63, 0x46, 0x00, 0x64, 0x44,
  51    0x45, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
  52    0xe8, 0xe9, 0x71, 0x72, 0x73, 0x00, 0x00, 0x00,
  53    0x00, 0x00, 0x00, 0x85, 0x00, 0x00, 0x00, 0x00,
  54    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  55    0x00, 0x00, 0x00, 0x00, 0x00, 0xe3, 0xe7, 0x65,
  56
  57    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  58    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  59    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  60    0x00, 0x00, 0x00, 0x00, 0x58, 0xe4, 0x00, 0x00,
  61    0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  62    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x81, 0x00,
  63    0x80, 0x00, 0x00, 0x00, 0x00, 0x54, 0x00, 0x46,
  64    0xe6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  65    0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x48, 0x4a,
  66    0x52, 0x4b, 0x00, 0x50, 0x00, 0x4f, 0x00, 0x4d,
  67    0x51, 0x4e, 0x49, 0x4c, 0x00, 0x00, 0x00, 0x00,
  68    0x00, 0x00, 0x00, 0xe3, 0xe7, 0x65, 0x66, 0x00,
  69    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  70    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  71    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  72    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  73};
  74
  75bool hid_has_events(HIDState *hs)
  76{
  77    return hs->n > 0 || hs->idle_pending;
  78}
  79
  80static void hid_idle_timer(void *opaque)
  81{
  82    HIDState *hs = opaque;
  83
  84    hs->idle_pending = true;
  85    hs->event(hs);
  86}
  87
  88static void hid_del_idle_timer(HIDState *hs)
  89{
  90    if (hs->idle_timer) {
  91        timer_free(hs->idle_timer);
  92        hs->idle_timer = NULL;
  93    }
  94}
  95
  96void hid_set_next_idle(HIDState *hs)
  97{
  98    if (hs->idle) {
  99        uint64_t expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
 100                               NANOSECONDS_PER_SECOND * hs->idle * 4 / 1000;
 101        if (!hs->idle_timer) {
 102            hs->idle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, hid_idle_timer, hs);
 103        }
 104        timer_mod_ns(hs->idle_timer, expire_time);
 105    } else {
 106        hid_del_idle_timer(hs);
 107    }
 108}
 109
 110static void hid_pointer_event(DeviceState *dev, QemuConsole *src,
 111                              InputEvent *evt)
 112{
 113    static const int bmap[INPUT_BUTTON__MAX] = {
 114        [INPUT_BUTTON_LEFT]   = 0x01,
 115        [INPUT_BUTTON_RIGHT]  = 0x02,
 116        [INPUT_BUTTON_MIDDLE] = 0x04,
 117    };
 118    HIDState *hs = (HIDState *)dev;
 119    HIDPointerEvent *e;
 120    InputMoveEvent *move;
 121    InputBtnEvent *btn;
 122
 123    assert(hs->n < QUEUE_LENGTH);
 124    e = &hs->ptr.queue[(hs->head + hs->n) & QUEUE_MASK];
 125
 126    switch (evt->type) {
 127    case INPUT_EVENT_KIND_REL:
 128        move = evt->u.rel.data;
 129        if (move->axis == INPUT_AXIS_X) {
 130            e->xdx += move->value;
 131        } else if (move->axis == INPUT_AXIS_Y) {
 132            e->ydy += move->value;
 133        }
 134        break;
 135
 136    case INPUT_EVENT_KIND_ABS:
 137        move = evt->u.abs.data;
 138        if (move->axis == INPUT_AXIS_X) {
 139            e->xdx = move->value;
 140        } else if (move->axis == INPUT_AXIS_Y) {
 141            e->ydy = move->value;
 142        }
 143        break;
 144
 145    case INPUT_EVENT_KIND_BTN:
 146        btn = evt->u.btn.data;
 147        if (btn->down) {
 148            e->buttons_state |= bmap[btn->button];
 149            if (btn->button == INPUT_BUTTON_WHEEL_UP) {
 150                e->dz--;
 151            } else if (btn->button == INPUT_BUTTON_WHEEL_DOWN) {
 152                e->dz++;
 153            }
 154        } else {
 155            e->buttons_state &= ~bmap[btn->button];
 156        }
 157        break;
 158
 159    default:
 160        /* keep gcc happy */
 161        break;
 162    }
 163
 164}
 165
 166static void hid_pointer_sync(DeviceState *dev)
 167{
 168    HIDState *hs = (HIDState *)dev;
 169    HIDPointerEvent *prev, *curr, *next;
 170    bool event_compression = false;
 171
 172    if (hs->n == QUEUE_LENGTH-1) {
 173        /*
 174         * Queue full.  We are losing information, but we at least
 175         * keep track of most recent button state.
 176         */
 177        return;
 178    }
 179
 180    prev = &hs->ptr.queue[(hs->head + hs->n - 1) & QUEUE_MASK];
 181    curr = &hs->ptr.queue[(hs->head + hs->n) & QUEUE_MASK];
 182    next = &hs->ptr.queue[(hs->head + hs->n + 1) & QUEUE_MASK];
 183
 184    if (hs->n > 0) {
 185        /*
 186         * No button state change between previous and current event
 187         * (and previous wasn't seen by the guest yet), so there is
 188         * motion information only and we can combine the two event
 189         * into one.
 190         */
 191        if (curr->buttons_state == prev->buttons_state) {
 192            event_compression = true;
 193        }
 194    }
 195
 196    if (event_compression) {
 197        /* add current motion to previous, clear current */
 198        if (hs->kind == HID_MOUSE) {
 199            prev->xdx += curr->xdx;
 200            curr->xdx = 0;
 201            prev->ydy += curr->ydy;
 202            curr->ydy = 0;
 203        } else {
 204            prev->xdx = curr->xdx;
 205            prev->ydy = curr->ydy;
 206        }
 207        prev->dz += curr->dz;
 208        curr->dz = 0;
 209    } else {
 210        /* prepate next (clear rel, copy abs + btns) */
 211        if (hs->kind == HID_MOUSE) {
 212            next->xdx = 0;
 213            next->ydy = 0;
 214        } else {
 215            next->xdx = curr->xdx;
 216            next->ydy = curr->ydy;
 217        }
 218        next->dz = 0;
 219        next->buttons_state = curr->buttons_state;
 220        /* make current guest visible, notify guest */
 221        hs->n++;
 222        hs->event(hs);
 223    }
 224}
 225
 226static void hid_keyboard_event(DeviceState *dev, QemuConsole *src,
 227                               InputEvent *evt)
 228{
 229    HIDState *hs = (HIDState *)dev;
 230    int scancodes[3], i, count;
 231    int slot;
 232    InputKeyEvent *key = evt->u.key.data;
 233
 234    count = qemu_input_key_value_to_scancode(key->key,
 235                                             key->down,
 236                                             scancodes);
 237    if (hs->n + count > QUEUE_LENGTH) {
 238        trace_hid_kbd_queue_full();
 239        return;
 240    }
 241    for (i = 0; i < count; i++) {
 242        slot = (hs->head + hs->n) & QUEUE_MASK; hs->n++;
 243        hs->kbd.keycodes[slot] = scancodes[i];
 244    }
 245    hs->event(hs);
 246}
 247
 248static void hid_keyboard_process_keycode(HIDState *hs)
 249{
 250    uint8_t hid_code, index, key;
 251    int i, keycode, slot;
 252
 253    if (hs->n == 0) {
 254        return;
 255    }
 256    slot = hs->head & QUEUE_MASK; QUEUE_INCR(hs->head); hs->n--;
 257    keycode = hs->kbd.keycodes[slot];
 258
 259    if (!hs->n) {
 260        trace_hid_kbd_queue_empty();
 261    }
 262
 263    key = keycode & 0x7f;
 264    index = key | ((hs->kbd.modifiers & (1 << 8)) >> 1);
 265    hid_code = hid_usage_keys[index];
 266    hs->kbd.modifiers &= ~(1 << 8);
 267
 268    switch (hid_code) {
 269    case 0x00:
 270        return;
 271
 272    case 0xe0:
 273        assert(key == 0x1d);
 274        if (hs->kbd.modifiers & (1 << 9)) {
 275            /* The hid_codes for the 0xe1/0x1d scancode sequence are 0xe9/0xe0.
 276             * Here we're processing the second hid_code.  By dropping bit 9
 277             * and setting bit 8, the scancode after 0x1d will access the
 278             * second half of the table.
 279             */
 280            hs->kbd.modifiers ^= (1 << 8) | (1 << 9);
 281            return;
 282        }
 283        /* fall through to process Ctrl_L */
 284    case 0xe1 ... 0xe7:
 285        /* Ctrl_L/Ctrl_R, Shift_L/Shift_R, Alt_L/Alt_R, Win_L/Win_R.
 286         * Handle releases here, or fall through to process presses.
 287         */
 288        if (keycode & (1 << 7)) {
 289            hs->kbd.modifiers &= ~(1 << (hid_code & 0x0f));
 290            return;
 291        }
 292        /* fall through */
 293    case 0xe8 ... 0xe9:
 294        /* USB modifiers are just 1 byte long.  Bits 8 and 9 of
 295         * hs->kbd.modifiers implement a state machine that detects the
 296         * 0xe0 and 0xe1/0x1d sequences.  These bits do not follow the
 297         * usual rules where bit 7 marks released keys; they are cleared
 298         * elsewhere in the function as the state machine dictates.
 299         */
 300        hs->kbd.modifiers |= 1 << (hid_code & 0x0f);
 301        return;
 302
 303    case 0xea ... 0xef:
 304        abort();
 305
 306    default:
 307        break;
 308    }
 309
 310    if (keycode & (1 << 7)) {
 311        for (i = hs->kbd.keys - 1; i >= 0; i--) {
 312            if (hs->kbd.key[i] == hid_code) {
 313                hs->kbd.key[i] = hs->kbd.key[-- hs->kbd.keys];
 314                hs->kbd.key[hs->kbd.keys] = 0x00;
 315                break;
 316            }
 317        }
 318        if (i < 0) {
 319            return;
 320        }
 321    } else {
 322        for (i = hs->kbd.keys - 1; i >= 0; i--) {
 323            if (hs->kbd.key[i] == hid_code) {
 324                break;
 325            }
 326        }
 327        if (i < 0) {
 328            if (hs->kbd.keys < sizeof(hs->kbd.key)) {
 329                hs->kbd.key[hs->kbd.keys++] = hid_code;
 330            }
 331        } else {
 332            return;
 333        }
 334    }
 335}
 336
 337static inline int int_clamp(int val, int vmin, int vmax)
 338{
 339    if (val < vmin) {
 340        return vmin;
 341    } else if (val > vmax) {
 342        return vmax;
 343    } else {
 344        return val;
 345    }
 346}
 347
 348void hid_pointer_activate(HIDState *hs)
 349{
 350    if (!hs->ptr.mouse_grabbed) {
 351        qemu_input_handler_activate(hs->s);
 352        hs->ptr.mouse_grabbed = 1;
 353    }
 354}
 355
 356int hid_pointer_poll(HIDState *hs, uint8_t *buf, int len)
 357{
 358    int dx, dy, dz, l;
 359    int index;
 360    HIDPointerEvent *e;
 361
 362    hs->idle_pending = false;
 363
 364    hid_pointer_activate(hs);
 365
 366    /* When the buffer is empty, return the last event.  Relative
 367       movements will all be zero.  */
 368    index = (hs->n ? hs->head : hs->head - 1);
 369    e = &hs->ptr.queue[index & QUEUE_MASK];
 370
 371    if (hs->kind == HID_MOUSE) {
 372        dx = int_clamp(e->xdx, -127, 127);
 373        dy = int_clamp(e->ydy, -127, 127);
 374        e->xdx -= dx;
 375        e->ydy -= dy;
 376    } else {
 377        dx = e->xdx;
 378        dy = e->ydy;
 379    }
 380    dz = int_clamp(e->dz, -127, 127);
 381    e->dz -= dz;
 382
 383    if (hs->n &&
 384        !e->dz &&
 385        (hs->kind == HID_TABLET || (!e->xdx && !e->ydy))) {
 386        /* that deals with this event */
 387        QUEUE_INCR(hs->head);
 388        hs->n--;
 389    }
 390
 391    /* Appears we have to invert the wheel direction */
 392    dz = 0 - dz;
 393    l = 0;
 394    switch (hs->kind) {
 395    case HID_MOUSE:
 396        if (len > l) {
 397            buf[l++] = e->buttons_state;
 398        }
 399        if (len > l) {
 400            buf[l++] = dx;
 401        }
 402        if (len > l) {
 403            buf[l++] = dy;
 404        }
 405        if (len > l) {
 406            buf[l++] = dz;
 407        }
 408        break;
 409
 410    case HID_TABLET:
 411        if (len > l) {
 412            buf[l++] = e->buttons_state;
 413        }
 414        if (len > l) {
 415            buf[l++] = dx & 0xff;
 416        }
 417        if (len > l) {
 418            buf[l++] = dx >> 8;
 419        }
 420        if (len > l) {
 421            buf[l++] = dy & 0xff;
 422        }
 423        if (len > l) {
 424            buf[l++] = dy >> 8;
 425        }
 426        if (len > l) {
 427            buf[l++] = dz;
 428        }
 429        break;
 430
 431    default:
 432        abort();
 433    }
 434
 435    return l;
 436}
 437
 438int hid_keyboard_poll(HIDState *hs, uint8_t *buf, int len)
 439{
 440    hs->idle_pending = false;
 441
 442    if (len < 2) {
 443        return 0;
 444    }
 445
 446    hid_keyboard_process_keycode(hs);
 447
 448    buf[0] = hs->kbd.modifiers & 0xff;
 449    buf[1] = 0;
 450    if (hs->kbd.keys > 6) {
 451        memset(buf + 2, HID_USAGE_ERROR_ROLLOVER, MIN(8, len) - 2);
 452    } else {
 453        memcpy(buf + 2, hs->kbd.key, MIN(8, len) - 2);
 454    }
 455
 456    return MIN(8, len);
 457}
 458
 459int hid_keyboard_write(HIDState *hs, uint8_t *buf, int len)
 460{
 461    if (len > 0) {
 462        int ledstate = 0;
 463        /* 0x01: Num Lock LED
 464         * 0x02: Caps Lock LED
 465         * 0x04: Scroll Lock LED
 466         * 0x08: Compose LED
 467         * 0x10: Kana LED */
 468        hs->kbd.leds = buf[0];
 469        if (hs->kbd.leds & 0x04) {
 470            ledstate |= QEMU_SCROLL_LOCK_LED;
 471        }
 472        if (hs->kbd.leds & 0x01) {
 473            ledstate |= QEMU_NUM_LOCK_LED;
 474        }
 475        if (hs->kbd.leds & 0x02) {
 476            ledstate |= QEMU_CAPS_LOCK_LED;
 477        }
 478        kbd_put_ledstate(ledstate);
 479    }
 480    return 0;
 481}
 482
 483void hid_reset(HIDState *hs)
 484{
 485    switch (hs->kind) {
 486    case HID_KEYBOARD:
 487        memset(hs->kbd.keycodes, 0, sizeof(hs->kbd.keycodes));
 488        memset(hs->kbd.key, 0, sizeof(hs->kbd.key));
 489        hs->kbd.keys = 0;
 490        hs->kbd.modifiers = 0;
 491        break;
 492    case HID_MOUSE:
 493    case HID_TABLET:
 494        memset(hs->ptr.queue, 0, sizeof(hs->ptr.queue));
 495        break;
 496    }
 497    hs->head = 0;
 498    hs->n = 0;
 499    hs->protocol = 1;
 500    hs->idle = 0;
 501    hs->idle_pending = false;
 502    hid_del_idle_timer(hs);
 503}
 504
 505void hid_free(HIDState *hs)
 506{
 507    qemu_input_handler_unregister(hs->s);
 508    hid_del_idle_timer(hs);
 509}
 510
 511static QemuInputHandler hid_keyboard_handler = {
 512    .name  = "QEMU HID Keyboard",
 513    .mask  = INPUT_EVENT_MASK_KEY,
 514    .event = hid_keyboard_event,
 515};
 516
 517static QemuInputHandler hid_mouse_handler = {
 518    .name  = "QEMU HID Mouse",
 519    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
 520    .event = hid_pointer_event,
 521    .sync  = hid_pointer_sync,
 522};
 523
 524static QemuInputHandler hid_tablet_handler = {
 525    .name  = "QEMU HID Tablet",
 526    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS,
 527    .event = hid_pointer_event,
 528    .sync  = hid_pointer_sync,
 529};
 530
 531void hid_init(HIDState *hs, int kind, HIDEventFunc event)
 532{
 533    hs->kind = kind;
 534    hs->event = event;
 535
 536    if (hs->kind == HID_KEYBOARD) {
 537        hs->s = qemu_input_handler_register((DeviceState *)hs,
 538                                            &hid_keyboard_handler);
 539        qemu_input_handler_activate(hs->s);
 540    } else if (hs->kind == HID_MOUSE) {
 541        hs->s = qemu_input_handler_register((DeviceState *)hs,
 542                                            &hid_mouse_handler);
 543    } else if (hs->kind == HID_TABLET) {
 544        hs->s = qemu_input_handler_register((DeviceState *)hs,
 545                                            &hid_tablet_handler);
 546    }
 547}
 548
 549static int hid_post_load(void *opaque, int version_id)
 550{
 551    HIDState *s = opaque;
 552
 553    hid_set_next_idle(s);
 554
 555    if (s->n == QUEUE_LENGTH && (s->kind == HID_TABLET ||
 556                                 s->kind == HID_MOUSE)) {
 557        /*
 558         * Handle ptr device migration from old qemu with full queue.
 559         *
 560         * Throw away everything but the last event, so we propagate
 561         * at least the current button state to the guest.  Also keep
 562         * current position for the tablet, signal "no motion" for the
 563         * mouse.
 564         */
 565        HIDPointerEvent evt;
 566        evt = s->ptr.queue[(s->head+s->n) & QUEUE_MASK];
 567        if (s->kind == HID_MOUSE) {
 568            evt.xdx = 0;
 569            evt.ydy = 0;
 570        }
 571        s->ptr.queue[0] = evt;
 572        s->head = 0;
 573        s->n = 1;
 574    }
 575    return 0;
 576}
 577
 578static const VMStateDescription vmstate_hid_ptr_queue = {
 579    .name = "HIDPointerEventQueue",
 580    .version_id = 1,
 581    .minimum_version_id = 1,
 582    .fields = (VMStateField[]) {
 583        VMSTATE_INT32(xdx, HIDPointerEvent),
 584        VMSTATE_INT32(ydy, HIDPointerEvent),
 585        VMSTATE_INT32(dz, HIDPointerEvent),
 586        VMSTATE_INT32(buttons_state, HIDPointerEvent),
 587        VMSTATE_END_OF_LIST()
 588    }
 589};
 590
 591const VMStateDescription vmstate_hid_ptr_device = {
 592    .name = "HIDPointerDevice",
 593    .version_id = 1,
 594    .minimum_version_id = 1,
 595    .post_load = hid_post_load,
 596    .fields = (VMStateField[]) {
 597        VMSTATE_STRUCT_ARRAY(ptr.queue, HIDState, QUEUE_LENGTH, 0,
 598                             vmstate_hid_ptr_queue, HIDPointerEvent),
 599        VMSTATE_UINT32(head, HIDState),
 600        VMSTATE_UINT32(n, HIDState),
 601        VMSTATE_INT32(protocol, HIDState),
 602        VMSTATE_UINT8(idle, HIDState),
 603        VMSTATE_END_OF_LIST(),
 604    }
 605};
 606
 607const VMStateDescription vmstate_hid_keyboard_device = {
 608    .name = "HIDKeyboardDevice",
 609    .version_id = 1,
 610    .minimum_version_id = 1,
 611    .post_load = hid_post_load,
 612    .fields = (VMStateField[]) {
 613        VMSTATE_UINT32_ARRAY(kbd.keycodes, HIDState, QUEUE_LENGTH),
 614        VMSTATE_UINT32(head, HIDState),
 615        VMSTATE_UINT32(n, HIDState),
 616        VMSTATE_UINT16(kbd.modifiers, HIDState),
 617        VMSTATE_UINT8(kbd.leds, HIDState),
 618        VMSTATE_UINT8_ARRAY(kbd.key, HIDState, 16),
 619        VMSTATE_INT32(kbd.keys, HIDState),
 620        VMSTATE_INT32(protocol, HIDState),
 621        VMSTATE_UINT8(idle, HIDState),
 622        VMSTATE_END_OF_LIST(),
 623    }
 624};
 625