hw/input/hid.c

   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 #include "qemu/osdep.h"
  26 #include "hw/hw.h"
  27 #include "ui/console.h"
  28 #include "qemu/timer.h"
  29 #include "hw/input/hid.h"
  30 #include "trace.h"
  31
  32 #define HID_USAGE_ERROR_ROLLOVER        0x01
  33 #define HID_USAGE_POSTFAIL              0x02
  34 #define HID_USAGE_ERROR_UNDEFINED       0x03
  35
  36 /* Indices are QEMU keycodes, values are from HID Usage Table.  Indices
  37  * above 0x80 are for keys that come after 0xe0 or 0xe1+0x1d or 0xe1+0x9d.  */
  38 static const uint8_t hid_usage_keys[0x100] = {
  39     0x00, 0x29, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
  40     0x24, 0x25, 0x26, 0x27, 0x2d, 0x2e, 0x2a, 0x2b,
  41     0x14, 0x1a, 0x08, 0x15, 0x17, 0x1c, 0x18, 0x0c,
  42     0x12, 0x13, 0x2f, 0x30, 0x28, 0xe0, 0x04, 0x16,
  43     0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x0f, 0x33,
  44     0x34, 0x35, 0xe1, 0x31, 0x1d, 0x1b, 0x06, 0x19,
  45     0x05, 0x11, 0x10, 0x36, 0x37, 0x38, 0xe5, 0x55,
  46     0xe2, 0x2c, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
  47     0x3f, 0x40, 0x41, 0x42, 0x43, 0x53, 0x47, 0x5f,
  48     0x60, 0x61, 0x56, 0x5c, 0x5d, 0x5e, 0x57, 0x59,
  49     0x5a, 0x5b, 0x62, 0x63, 0x46, 0x00, 0x64, 0x44,
  50     0x45, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
  51     0xe8, 0xe9, 0x71, 0x72, 0x73, 0x00, 0x00, 0x00,
  52     0x00, 0x00, 0x00, 0x85, 0x00, 0x00, 0x00, 0x00,
  53     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  54     0x00, 0x00, 0x00, 0x00, 0x00, 0xe3, 0xe7, 0x65,
  55
  56     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  57     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  58     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  59     0x00, 0x00, 0x00, 0x00, 0x58, 0xe4, 0x00, 0x00,
  60     0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  61     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x81, 0x00,
  62     0x80, 0x00, 0x00, 0x00, 0x00, 0x54, 0x00, 0x46,
  63     0xe6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  64     0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x48, 0x4a,
  65     0x52, 0x4b, 0x00, 0x50, 0x00, 0x4f, 0x00, 0x4d,
  66     0x51, 0x4e, 0x49, 0x4c, 0x00, 0x00, 0x00, 0x00,
  67     0x00, 0x00, 0x00, 0xe3, 0xe7, 0x65, 0x66, 0x00,
  68     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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 };
  73
  74 bool hid_has_events(HIDState *hs)
  75 {
  76     return hs->n > 0 || hs->idle_pending;
  77 }
  78
  79 static void hid_idle_timer(void *opaque)
  80 {
  81     HIDState *hs = opaque;
  82
  83     hs->idle_pending = true;
  84     hs->event(hs);
  85 }
  86
  87 static void hid_del_idle_timer(HIDState *hs)
  88 {
  89     if (hs->idle_timer) {
  90         timer_del(hs->idle_timer);
  91         timer_free(hs->idle_timer);
  92         hs->idle_timer = NULL;
  93     }
  94 }
  95
  96 void 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
 110 static 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
 166 static 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
 226 static 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
 248 static 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
 337 static 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
 348 void 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
 356 int 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
 438 int 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
 459 int 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
 483 void 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
 505 void hid_free(HIDState *hs)
 506 {
 507     qemu_input_handler_unregister(hs->s);
 508     hid_del_idle_timer(hs);
 509 }
 510
 511 static QemuInputHandler hid_keyboard_handler = {
 512     .name  = "QEMU HID Keyboard",
 513     .mask  = INPUT_EVENT_MASK_KEY,
 514     .event = hid_keyboard_event,
 515 };
 516
 517 static 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
 524 static 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
 531 void 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
 549 static 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
 578 static 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
 591 const 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
 607 const 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 };