hw/input/ps2.c

   1 /*
   2  * QEMU PS/2 keyboard/mouse emulation
   3  *
   4  * Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw/hw.h"
  25 #include "hw/input/ps2.h"
  26 #include "ui/console.h"
  27 #include "ui/input.h"
  28 #include "sysemu/sysemu.h"
  29
  30 #include "trace.h"
  31
  32 /* debug PC keyboard */
  33 //#define DEBUG_KBD
  34
  35 /* debug PC keyboard : only mouse */
  36 //#define DEBUG_MOUSE
  37
  38 /* Keyboard Commands */
  39 #define KBD_CMD_SET_LEDS        0xED    /* Set keyboard leds */
  40 #define KBD_CMD_ECHO            0xEE
  41 #define KBD_CMD_SCANCODE        0xF0    /* Get/set scancode set */
  42 #define KBD_CMD_GET_ID          0xF2    /* get keyboard ID */
  43 #define KBD_CMD_SET_RATE        0xF3    /* Set typematic rate */
  44 #define KBD_CMD_ENABLE          0xF4    /* Enable scanning */
  45 #define KBD_CMD_RESET_DISABLE   0xF5    /* reset and disable scanning */
  46 #define KBD_CMD_RESET_ENABLE    0xF6    /* reset and enable scanning */
  47 #define KBD_CMD_RESET           0xFF    /* Reset */
  48
  49 /* Keyboard Replies */
  50 #define KBD_REPLY_POR           0xAA    /* Power on reset */
  51 #define KBD_REPLY_ID            0xAB    /* Keyboard ID */
  52 #define KBD_REPLY_ACK           0xFA    /* Command ACK */
  53 #define KBD_REPLY_RESEND        0xFE    /* Command NACK, send the cmd again */
  54
  55 /* Mouse Commands */
  56 #define AUX_SET_SCALE11         0xE6    /* Set 1:1 scaling */
  57 #define AUX_SET_SCALE21         0xE7    /* Set 2:1 scaling */
  58 #define AUX_SET_RES             0xE8    /* Set resolution */
  59 #define AUX_GET_SCALE           0xE9    /* Get scaling factor */
  60 #define AUX_SET_STREAM          0xEA    /* Set stream mode */
  61 #define AUX_POLL                0xEB    /* Poll */
  62 #define AUX_RESET_WRAP          0xEC    /* Reset wrap mode */
  63 #define AUX_SET_WRAP            0xEE    /* Set wrap mode */
  64 #define AUX_SET_REMOTE          0xF0    /* Set remote mode */
  65 #define AUX_GET_TYPE            0xF2    /* Get type */
  66 #define AUX_SET_SAMPLE          0xF3    /* Set sample rate */
  67 #define AUX_ENABLE_DEV          0xF4    /* Enable aux device */
  68 #define AUX_DISABLE_DEV         0xF5    /* Disable aux device */
  69 #define AUX_SET_DEFAULT         0xF6
  70 #define AUX_RESET               0xFF    /* Reset aux device */
  71 #define AUX_ACK                 0xFA    /* Command byte ACK. */
  72
  73 #define MOUSE_STATUS_REMOTE     0x40
  74 #define MOUSE_STATUS_ENABLED    0x20
  75 #define MOUSE_STATUS_SCALE21    0x10
  76
  77 #define PS2_QUEUE_SIZE 16  /* Buffer size required by PS/2 protocol */
  78
  79 typedef struct {
  80     /* Keep the data array 256 bytes long, which compatibility
  81      with older qemu versions. */
  82     uint8_t data[256];
  83     int rptr, wptr, count;
  84 } PS2Queue;
  85
  86 typedef struct {
  87     PS2Queue queue;
  88     int32_t write_cmd;
  89     void (*update_irq)(void *, int);
  90     void *update_arg;
  91 } PS2State;
  92
  93 typedef struct {
  94     PS2State common;
  95     int scan_enabled;
  96     /* QEMU uses translated PC scancodes internally.  To avoid multiple
  97        conversions we do the translation (if any) in the PS/2 emulation
  98        not the keyboard controller.  */
  99     int translate;
 100     int scancode_set; /* 1=XT, 2=AT, 3=PS/2 */
 101     int ledstate;
 102 } PS2KbdState;
 103
 104 typedef struct {
 105     PS2State common;
 106     uint8_t mouse_status;
 107     uint8_t mouse_resolution;
 108     uint8_t mouse_sample_rate;
 109     uint8_t mouse_wrap;
 110     uint8_t mouse_type; /* 0 = PS2, 3 = IMPS/2, 4 = IMEX */
 111     uint8_t mouse_detect_state;
 112     int mouse_dx; /* current values, needed for 'poll' mode */
 113     int mouse_dy;
 114     int mouse_dz;
 115     uint8_t mouse_buttons;
 116 } PS2MouseState;
 117
 118 /* Table to convert from PC scancodes to raw scancodes.  */
 119 static const unsigned char ps2_raw_keycode[128] = {
 120   0, 118,  22,  30,  38,  37,  46,  54,  61,  62,  70,  69,  78,  85, 102,  13,
 121  21,  29,  36,  45,  44,  53,  60,  67,  68,  77,  84,  91,  90,  20,  28,  27,
 122  35,  43,  52,  51,  59,  66,  75,  76,  82,  14,  18,  93,  26,  34,  33,  42,
 123  50,  49,  58,  65,  73,  74,  89, 124,  17,  41,  88,   5,   6,   4,  12,   3,
 124  11,   2,  10,   1,   9, 119, 126, 108, 117, 125, 123, 107, 115, 116, 121, 105,
 125 114, 122, 112, 113, 127,  96,  97, 120,   7,  15,  23,  31,  39,  47,  55,  63,
 126  71,  79,  86,  94,   8,  16,  24,  32,  40,  48,  56,  64,  72,  80,  87, 111,
 127  19,  25,  57,  81,  83,  92,  95,  98,  99, 100, 101, 103, 104, 106, 109, 110
 128 };
 129 static const unsigned char ps2_raw_keycode_set3[128] = {
 130   0,   8,  22,  30,  38,  37,  46,  54,  61,  62,  70,  69,  78,  85, 102,  13,
 131  21,  29,  36,  45,  44,  53,  60,  67,  68,  77,  84,  91,  90,  17,  28,  27,
 132  35,  43,  52,  51,  59,  66,  75,  76,  82,  14,  18,  92,  26,  34,  33,  42,
 133  50,  49,  58,  65,  73,  74,  89, 126,  25,  41,  20,   7,  15,  23,  31,  39,
 134  47,   2,  63,  71,  79, 118,  95, 108, 117, 125, 132, 107, 115, 116, 124, 105,
 135 114, 122, 112, 113, 127,  96,  97,  86,  94,  15,  23,  31,  39,  47,  55,  63,
 136  71,  79,  86,  94,   8,  16,  24,  32,  40,  48,  56,  64,  72,  80,  87, 111,
 137  19,  25,  57,  81,  83,  92,  95,  98,  99, 100, 101, 103, 104, 106, 109, 110
 138 };
 139
 140 void ps2_queue(void *opaque, int b)
 141 {
 142     PS2State *s = (PS2State *)opaque;
 143     PS2Queue *q = &s->queue;
 144
 145     if (q->count >= PS2_QUEUE_SIZE - 1)
 146         return;
 147     q->data[q->wptr] = b;
 148     if (++q->wptr == PS2_QUEUE_SIZE)
 149         q->wptr = 0;
 150     q->count++;
 151     s->update_irq(s->update_arg, 1);
 152 }
 153
 154 /*
 155    keycode is expressed as follow:
 156    bit 7    - 0 key pressed, 1 = key released
 157    bits 6-0 - translated scancode set 2
 158  */
 159 static void ps2_put_keycode(void *opaque, int keycode)
 160 {
 161     PS2KbdState *s = opaque;
 162
 163     trace_ps2_put_keycode(opaque, keycode);
 164     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
 165     /* XXX: add support for scancode set 1 */
 166     if (!s->translate && keycode < 0xe0 && s->scancode_set > 1) {
 167         if (keycode & 0x80) {
 168             ps2_queue(&s->common, 0xf0);
 169         }
 170         if (s->scancode_set == 2) {
 171             keycode = ps2_raw_keycode[keycode & 0x7f];
 172         } else if (s->scancode_set == 3) {
 173             keycode = ps2_raw_keycode_set3[keycode & 0x7f];
 174         }
 175       }
 176     ps2_queue(&s->common, keycode);
 177 }
 178
 179 static void ps2_keyboard_event(DeviceState *dev, QemuConsole *src,
 180                                InputEvent *evt)
 181 {
 182     PS2KbdState *s = (PS2KbdState *)dev;
 183     int scancodes[3], i, count;
 184
 185     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
 186     count = qemu_input_key_value_to_scancode(evt->u.key->key,
 187                                              evt->u.key->down,
 188                                              scancodes);
 189     for (i = 0; i < count; i++) {
 190         ps2_put_keycode(s, scancodes[i]);
 191     }
 192 }
 193
 194 uint32_t ps2_read_data(void *opaque)
 195 {
 196     PS2State *s = (PS2State *)opaque;
 197     PS2Queue *q;
 198     int val, index;
 199
 200     trace_ps2_read_data(opaque);
 201     q = &s->queue;
 202     if (q->count == 0) {
 203         /* NOTE: if no data left, we return the last keyboard one
 204            (needed for EMM386) */
 205         /* XXX: need a timer to do things correctly */
 206         index = q->rptr - 1;
 207         if (index < 0)
 208             index = PS2_QUEUE_SIZE - 1;
 209         val = q->data[index];
 210     } else {
 211         val = q->data[q->rptr];
 212         if (++q->rptr == PS2_QUEUE_SIZE)
 213             q->rptr = 0;
 214         q->count--;
 215         /* reading deasserts IRQ */
 216         s->update_irq(s->update_arg, 0);
 217         /* reassert IRQs if data left */
 218         s->update_irq(s->update_arg, q->count != 0);
 219     }
 220     return val;
 221 }
 222
 223 static void ps2_set_ledstate(PS2KbdState *s, int ledstate)
 224 {
 225     trace_ps2_set_ledstate(s, ledstate);
 226     s->ledstate = ledstate;
 227     kbd_put_ledstate(ledstate);
 228 }
 229
 230 static void ps2_reset_keyboard(PS2KbdState *s)
 231 {
 232     trace_ps2_reset_keyboard(s);
 233     s->scan_enabled = 1;
 234     s->scancode_set = 2;
 235     ps2_set_ledstate(s, 0);
 236 }
 237
 238 void ps2_write_keyboard(void *opaque, int val)
 239 {
 240     PS2KbdState *s = (PS2KbdState *)opaque;
 241
 242     trace_ps2_write_keyboard(opaque, val);
 243     switch(s->common.write_cmd) {
 244     default:
 245     case -1:
 246         switch(val) {
 247         case 0x00:
 248             ps2_queue(&s->common, KBD_REPLY_ACK);
 249             break;
 250         case 0x05:
 251             ps2_queue(&s->common, KBD_REPLY_RESEND);
 252             break;
 253         case KBD_CMD_GET_ID:
 254             ps2_queue(&s->common, KBD_REPLY_ACK);
 255             /* We emulate a MF2 AT keyboard here */
 256             ps2_queue(&s->common, KBD_REPLY_ID);
 257             if (s->translate)
 258                 ps2_queue(&s->common, 0x41);
 259             else
 260                 ps2_queue(&s->common, 0x83);
 261             break;
 262         case KBD_CMD_ECHO:
 263             ps2_queue(&s->common, KBD_CMD_ECHO);
 264             break;
 265         case KBD_CMD_ENABLE:
 266             s->scan_enabled = 1;
 267             ps2_queue(&s->common, KBD_REPLY_ACK);
 268             break;
 269         case KBD_CMD_SCANCODE:
 270         case KBD_CMD_SET_LEDS:
 271         case KBD_CMD_SET_RATE:
 272             s->common.write_cmd = val;
 273             ps2_queue(&s->common, KBD_REPLY_ACK);
 274             break;
 275         case KBD_CMD_RESET_DISABLE:
 276             ps2_reset_keyboard(s);
 277             s->scan_enabled = 0;
 278             ps2_queue(&s->common, KBD_REPLY_ACK);
 279             break;
 280         case KBD_CMD_RESET_ENABLE:
 281             ps2_reset_keyboard(s);
 282             s->scan_enabled = 1;
 283             ps2_queue(&s->common, KBD_REPLY_ACK);
 284             break;
 285         case KBD_CMD_RESET:
 286             ps2_reset_keyboard(s);
 287             ps2_queue(&s->common, KBD_REPLY_ACK);
 288             ps2_queue(&s->common, KBD_REPLY_POR);
 289             break;
 290         default:
 291             ps2_queue(&s->common, KBD_REPLY_ACK);
 292             break;
 293         }
 294         break;
 295     case KBD_CMD_SCANCODE:
 296         if (val == 0) {
 297             if (s->scancode_set == 1)
 298                 ps2_put_keycode(s, 0x43);
 299             else if (s->scancode_set == 2)
 300                 ps2_put_keycode(s, 0x41);
 301             else if (s->scancode_set == 3)
 302                 ps2_put_keycode(s, 0x3f);
 303         } else {
 304             if (val >= 1 && val <= 3)
 305                 s->scancode_set = val;
 306             ps2_queue(&s->common, KBD_REPLY_ACK);
 307         }
 308         s->common.write_cmd = -1;
 309         break;
 310     case KBD_CMD_SET_LEDS:
 311         ps2_set_ledstate(s, val);
 312         ps2_queue(&s->common, KBD_REPLY_ACK);
 313         s->common.write_cmd = -1;
 314         break;
 315     case KBD_CMD_SET_RATE:
 316         ps2_queue(&s->common, KBD_REPLY_ACK);
 317         s->common.write_cmd = -1;
 318         break;
 319     }
 320 }
 321
 322 /* Set the scancode translation mode.
 323    0 = raw scancodes.
 324    1 = translated scancodes (used by qemu internally).  */
 325
 326 void ps2_keyboard_set_translation(void *opaque, int mode)
 327 {
 328     PS2KbdState *s = (PS2KbdState *)opaque;
 329     trace_ps2_keyboard_set_translation(opaque, mode);
 330     s->translate = mode;
 331 }
 332
 333 static void ps2_mouse_send_packet(PS2MouseState *s)
 334 {
 335     unsigned int b;
 336     int dx1, dy1, dz1;
 337
 338     dx1 = s->mouse_dx;
 339     dy1 = s->mouse_dy;
 340     dz1 = s->mouse_dz;
 341     /* XXX: increase range to 8 bits ? */
 342     if (dx1 > 127)
 343         dx1 = 127;
 344     else if (dx1 < -127)
 345         dx1 = -127;
 346     if (dy1 > 127)
 347         dy1 = 127;
 348     else if (dy1 < -127)
 349         dy1 = -127;
 350     b = 0x08 | ((dx1 < 0) << 4) | ((dy1 < 0) << 5) | (s->mouse_buttons & 0x07);
 351     ps2_queue(&s->common, b);
 352     ps2_queue(&s->common, dx1 & 0xff);
 353     ps2_queue(&s->common, dy1 & 0xff);
 354     /* extra byte for IMPS/2 or IMEX */
 355     switch(s->mouse_type) {
 356     default:
 357         break;
 358     case 3:
 359         if (dz1 > 127)
 360             dz1 = 127;
 361         else if (dz1 < -127)
 362                 dz1 = -127;
 363         ps2_queue(&s->common, dz1 & 0xff);
 364         break;
 365     case 4:
 366         if (dz1 > 7)
 367             dz1 = 7;
 368         else if (dz1 < -7)
 369             dz1 = -7;
 370         b = (dz1 & 0x0f) | ((s->mouse_buttons & 0x18) << 1);
 371         ps2_queue(&s->common, b);
 372         break;
 373     }
 374
 375     trace_ps2_mouse_send_packet(s, dx1, dy1, dz1, b);
 376     /* update deltas */
 377     s->mouse_dx -= dx1;
 378     s->mouse_dy -= dy1;
 379     s->mouse_dz -= dz1;
 380 }
 381
 382 static void ps2_mouse_event(DeviceState *dev, QemuConsole *src,
 383                             InputEvent *evt)
 384 {
 385     static const int bmap[INPUT_BUTTON_MAX] = {
 386         [INPUT_BUTTON_LEFT]   = MOUSE_EVENT_LBUTTON,
 387         [INPUT_BUTTON_MIDDLE] = MOUSE_EVENT_MBUTTON,
 388         [INPUT_BUTTON_RIGHT]  = MOUSE_EVENT_RBUTTON,
 389     };
 390     PS2MouseState *s = (PS2MouseState *)dev;
 391
 392     /* check if deltas are recorded when disabled */
 393     if (!(s->mouse_status & MOUSE_STATUS_ENABLED))
 394         return;
 395
 396     switch (evt->type) {
 397     case INPUT_EVENT_KIND_REL:
 398         if (evt->u.rel->axis == INPUT_AXIS_X) {
 399             s->mouse_dx += evt->u.rel->value;
 400         } else if (evt->u.rel->axis == INPUT_AXIS_Y) {
 401             s->mouse_dy -= evt->u.rel->value;
 402         }
 403         break;
 404
 405     case INPUT_EVENT_KIND_BTN:
 406         if (evt->u.btn->down) {
 407             s->mouse_buttons |= bmap[evt->u.btn->button];
 408             if (evt->u.btn->button == INPUT_BUTTON_WHEEL_UP) {
 409                 s->mouse_dz--;
 410             } else if (evt->u.btn->button == INPUT_BUTTON_WHEEL_DOWN) {
 411                 s->mouse_dz++;
 412             }
 413         } else {
 414             s->mouse_buttons &= ~bmap[evt->u.btn->button];
 415         }
 416         break;
 417
 418     default:
 419         /* keep gcc happy */
 420         break;
 421     }
 422 }
 423
 424 static void ps2_mouse_sync(DeviceState *dev)
 425 {
 426     PS2MouseState *s = (PS2MouseState *)dev;
 427
 428     if (s->mouse_buttons) {
 429         qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
 430     }
 431     if (!(s->mouse_status & MOUSE_STATUS_REMOTE)) {
 432         while (s->common.queue.count < PS2_QUEUE_SIZE - 4) {
 433             /* if not remote, send event. Multiple events are sent if
 434                too big deltas */
 435             ps2_mouse_send_packet(s);
 436             if (s->mouse_dx == 0 && s->mouse_dy == 0 && s->mouse_dz == 0)
 437                 break;
 438         }
 439     }
 440 }
 441
 442 void ps2_mouse_fake_event(void *opaque)
 443 {
 444     PS2MouseState *s = opaque;
 445     trace_ps2_mouse_fake_event(opaque);
 446     s->mouse_dx++;
 447     ps2_mouse_sync(opaque);
 448 }
 449
 450 void ps2_write_mouse(void *opaque, int val)
 451 {
 452     PS2MouseState *s = (PS2MouseState *)opaque;
 453
 454     trace_ps2_write_mouse(opaque, val);
 455 #ifdef DEBUG_MOUSE
 456     printf("kbd: write mouse 0x%02x\n", val);
 457 #endif
 458     switch(s->common.write_cmd) {
 459     default:
 460     case -1:
 461         /* mouse command */
 462         if (s->mouse_wrap) {
 463             if (val == AUX_RESET_WRAP) {
 464                 s->mouse_wrap = 0;
 465                 ps2_queue(&s->common, AUX_ACK);
 466                 return;
 467             } else if (val != AUX_RESET) {
 468                 ps2_queue(&s->common, val);
 469                 return;
 470             }
 471         }
 472         switch(val) {
 473         case AUX_SET_SCALE11:
 474             s->mouse_status &= ~MOUSE_STATUS_SCALE21;
 475             ps2_queue(&s->common, AUX_ACK);
 476             break;
 477         case AUX_SET_SCALE21:
 478             s->mouse_status |= MOUSE_STATUS_SCALE21;
 479             ps2_queue(&s->common, AUX_ACK);
 480             break;
 481         case AUX_SET_STREAM:
 482             s->mouse_status &= ~MOUSE_STATUS_REMOTE;
 483             ps2_queue(&s->common, AUX_ACK);
 484             break;
 485         case AUX_SET_WRAP:
 486             s->mouse_wrap = 1;
 487             ps2_queue(&s->common, AUX_ACK);
 488             break;
 489         case AUX_SET_REMOTE:
 490             s->mouse_status |= MOUSE_STATUS_REMOTE;
 491             ps2_queue(&s->common, AUX_ACK);
 492             break;
 493         case AUX_GET_TYPE:
 494             ps2_queue(&s->common, AUX_ACK);
 495             ps2_queue(&s->common, s->mouse_type);
 496             break;
 497         case AUX_SET_RES:
 498         case AUX_SET_SAMPLE:
 499             s->common.write_cmd = val;
 500             ps2_queue(&s->common, AUX_ACK);
 501             break;
 502         case AUX_GET_SCALE:
 503             ps2_queue(&s->common, AUX_ACK);
 504             ps2_queue(&s->common, s->mouse_status);
 505             ps2_queue(&s->common, s->mouse_resolution);
 506             ps2_queue(&s->common, s->mouse_sample_rate);
 507             break;
 508         case AUX_POLL:
 509             ps2_queue(&s->common, AUX_ACK);
 510             ps2_mouse_send_packet(s);
 511             break;
 512         case AUX_ENABLE_DEV:
 513             s->mouse_status |= MOUSE_STATUS_ENABLED;
 514             ps2_queue(&s->common, AUX_ACK);
 515             break;
 516         case AUX_DISABLE_DEV:
 517             s->mouse_status &= ~MOUSE_STATUS_ENABLED;
 518             ps2_queue(&s->common, AUX_ACK);
 519             break;
 520         case AUX_SET_DEFAULT:
 521             s->mouse_sample_rate = 100;
 522             s->mouse_resolution = 2;
 523             s->mouse_status = 0;
 524             ps2_queue(&s->common, AUX_ACK);
 525             break;
 526         case AUX_RESET:
 527             s->mouse_sample_rate = 100;
 528             s->mouse_resolution = 2;
 529             s->mouse_status = 0;
 530             s->mouse_type = 0;
 531             ps2_queue(&s->common, AUX_ACK);
 532             ps2_queue(&s->common, 0xaa);
 533             ps2_queue(&s->common, s->mouse_type);
 534             break;
 535         default:
 536             break;
 537         }
 538         break;
 539     case AUX_SET_SAMPLE:
 540         s->mouse_sample_rate = val;
 541         /* detect IMPS/2 or IMEX */
 542         switch(s->mouse_detect_state) {
 543         default:
 544         case 0:
 545             if (val == 200)
 546                 s->mouse_detect_state = 1;
 547             break;
 548         case 1:
 549             if (val == 100)
 550                 s->mouse_detect_state = 2;
 551             else if (val == 200)
 552                 s->mouse_detect_state = 3;
 553             else
 554                 s->mouse_detect_state = 0;
 555             break;
 556         case 2:
 557             if (val == 80)
 558                 s->mouse_type = 3; /* IMPS/2 */
 559             s->mouse_detect_state = 0;
 560             break;
 561         case 3:
 562             if (val == 80)
 563                 s->mouse_type = 4; /* IMEX */
 564             s->mouse_detect_state = 0;
 565             break;
 566         }
 567         ps2_queue(&s->common, AUX_ACK);
 568         s->common.write_cmd = -1;
 569         break;
 570     case AUX_SET_RES:
 571         s->mouse_resolution = val;
 572         ps2_queue(&s->common, AUX_ACK);
 573         s->common.write_cmd = -1;
 574         break;
 575     }
 576 }
 577
 578 static void ps2_common_reset(PS2State *s)
 579 {
 580     PS2Queue *q;
 581     s->write_cmd = -1;
 582     q = &s->queue;
 583     q->rptr = 0;
 584     q->wptr = 0;
 585     q->count = 0;
 586     s->update_irq(s->update_arg, 0);
 587 }
 588
 589 static void ps2_common_post_load(PS2State *s)
 590 {
 591     PS2Queue *q = &s->queue;
 592     int size;
 593     int i;
 594     int tmp_data[PS2_QUEUE_SIZE];
 595
 596     /* set the useful data buffer queue size, < PS2_QUEUE_SIZE */
 597     size = q->count > PS2_QUEUE_SIZE ? 0 : q->count;
 598
 599     /* move the queue elements to the start of data array */
 600     if (size > 0) {
 601         for (i = 0; i < size; i++) {
 602             /* move the queue elements to the temporary buffer */
 603             tmp_data[i] = q->data[q->rptr];
 604             if (++q->rptr == 256) {
 605                 q->rptr = 0;
 606             }
 607         }
 608         memcpy(q->data, tmp_data, size);
 609     }
 610     /* reset rptr/wptr/count */
 611     q->rptr = 0;
 612     q->wptr = size;
 613     q->count = size;
 614     s->update_irq(s->update_arg, q->count != 0);
 615 }
 616
 617 static void ps2_kbd_reset(void *opaque)
 618 {
 619     PS2KbdState *s = (PS2KbdState *) opaque;
 620
 621     trace_ps2_kbd_reset(opaque);
 622     ps2_common_reset(&s->common);
 623     s->scan_enabled = 0;
 624     s->translate = 0;
 625     s->scancode_set = 0;
 626 }
 627
 628 static void ps2_mouse_reset(void *opaque)
 629 {
 630     PS2MouseState *s = (PS2MouseState *) opaque;
 631
 632     trace_ps2_mouse_reset(opaque);
 633     ps2_common_reset(&s->common);
 634     s->mouse_status = 0;
 635     s->mouse_resolution = 0;
 636     s->mouse_sample_rate = 0;
 637     s->mouse_wrap = 0;
 638     s->mouse_type = 0;
 639     s->mouse_detect_state = 0;
 640     s->mouse_dx = 0;
 641     s->mouse_dy = 0;
 642     s->mouse_dz = 0;
 643     s->mouse_buttons = 0;
 644 }
 645
 646 static const VMStateDescription vmstate_ps2_common = {
 647     .name = "PS2 Common State",
 648     .version_id = 3,
 649     .minimum_version_id = 2,
 650     .fields = (VMStateField[]) {
 651         VMSTATE_INT32(write_cmd, PS2State),
 652         VMSTATE_INT32(queue.rptr, PS2State),
 653         VMSTATE_INT32(queue.wptr, PS2State),
 654         VMSTATE_INT32(queue.count, PS2State),
 655         VMSTATE_BUFFER(queue.data, PS2State),
 656         VMSTATE_END_OF_LIST()
 657     }
 658 };
 659
 660 static bool ps2_keyboard_ledstate_needed(void *opaque)
 661 {
 662     PS2KbdState *s = opaque;
 663
 664     return s->ledstate != 0; /* 0 is default state */
 665 }
 666
 667 static int ps2_kbd_ledstate_post_load(void *opaque, int version_id)
 668 {
 669     PS2KbdState *s = opaque;
 670
 671     kbd_put_ledstate(s->ledstate);
 672     return 0;
 673 }
 674
 675 static const VMStateDescription vmstate_ps2_keyboard_ledstate = {
 676     .name = "ps2kbd/ledstate",
 677     .version_id = 3,
 678     .minimum_version_id = 2,
 679     .post_load = ps2_kbd_ledstate_post_load,
 680     .needed = ps2_keyboard_ledstate_needed,
 681     .fields = (VMStateField[]) {
 682         VMSTATE_INT32(ledstate, PS2KbdState),
 683         VMSTATE_END_OF_LIST()
 684     }
 685 };
 686
 687 static int ps2_kbd_post_load(void* opaque, int version_id)
 688 {
 689     PS2KbdState *s = (PS2KbdState*)opaque;
 690     PS2State *ps2 = &s->common;
 691
 692     if (version_id == 2)
 693         s->scancode_set=2;
 694
 695     ps2_common_post_load(ps2);
 696
 697     return 0;
 698 }
 699
 700 static void ps2_kbd_pre_save(void *opaque)
 701 {
 702     PS2KbdState *s = (PS2KbdState *)opaque;
 703     PS2State *ps2 = &s->common;
 704
 705     ps2_common_post_load(ps2);
 706 }
 707
 708 static const VMStateDescription vmstate_ps2_keyboard = {
 709     .name = "ps2kbd",
 710     .version_id = 3,
 711     .minimum_version_id = 2,
 712     .post_load = ps2_kbd_post_load,
 713     .pre_save = ps2_kbd_pre_save,
 714     .fields = (VMStateField[]) {
 715         VMSTATE_STRUCT(common, PS2KbdState, 0, vmstate_ps2_common, PS2State),
 716         VMSTATE_INT32(scan_enabled, PS2KbdState),
 717         VMSTATE_INT32(translate, PS2KbdState),
 718         VMSTATE_INT32_V(scancode_set, PS2KbdState,3),
 719         VMSTATE_END_OF_LIST()
 720     },
 721     .subsections = (const VMStateDescription*[]) {
 722         &vmstate_ps2_keyboard_ledstate,
 723         NULL
 724     }
 725 };
 726
 727 static int ps2_mouse_post_load(void *opaque, int version_id)
 728 {
 729     PS2MouseState *s = (PS2MouseState *)opaque;
 730     PS2State *ps2 = &s->common;
 731
 732     ps2_common_post_load(ps2);
 733
 734     return 0;
 735 }
 736
 737 static void ps2_mouse_pre_save(void *opaque)
 738 {
 739     PS2MouseState *s = (PS2MouseState *)opaque;
 740     PS2State *ps2 = &s->common;
 741
 742     ps2_common_post_load(ps2);
 743 }
 744
 745 static const VMStateDescription vmstate_ps2_mouse = {
 746     .name = "ps2mouse",
 747     .version_id = 2,
 748     .minimum_version_id = 2,
 749     .post_load = ps2_mouse_post_load,
 750     .pre_save = ps2_mouse_pre_save,
 751     .fields = (VMStateField[]) {
 752         VMSTATE_STRUCT(common, PS2MouseState, 0, vmstate_ps2_common, PS2State),
 753         VMSTATE_UINT8(mouse_status, PS2MouseState),
 754         VMSTATE_UINT8(mouse_resolution, PS2MouseState),
 755         VMSTATE_UINT8(mouse_sample_rate, PS2MouseState),
 756         VMSTATE_UINT8(mouse_wrap, PS2MouseState),
 757         VMSTATE_UINT8(mouse_type, PS2MouseState),
 758         VMSTATE_UINT8(mouse_detect_state, PS2MouseState),
 759         VMSTATE_INT32(mouse_dx, PS2MouseState),
 760         VMSTATE_INT32(mouse_dy, PS2MouseState),
 761         VMSTATE_INT32(mouse_dz, PS2MouseState),
 762         VMSTATE_UINT8(mouse_buttons, PS2MouseState),
 763         VMSTATE_END_OF_LIST()
 764     }
 765 };
 766
 767 static QemuInputHandler ps2_keyboard_handler = {
 768     .name  = "QEMU PS/2 Keyboard",
 769     .mask  = INPUT_EVENT_MASK_KEY,
 770     .event = ps2_keyboard_event,
 771 };
 772
 773 void *ps2_kbd_init(void (*update_irq)(void *, int), void *update_arg)
 774 {
 775     PS2KbdState *s = (PS2KbdState *)g_malloc0(sizeof(PS2KbdState));
 776
 777     trace_ps2_kbd_init(s);
 778     s->common.update_irq = update_irq;
 779     s->common.update_arg = update_arg;
 780     s->scancode_set = 2;
 781     vmstate_register(NULL, 0, &vmstate_ps2_keyboard, s);
 782     qemu_input_handler_register((DeviceState *)s,
 783                                 &ps2_keyboard_handler);
 784     qemu_register_reset(ps2_kbd_reset, s);
 785     return s;
 786 }
 787
 788 static QemuInputHandler ps2_mouse_handler = {
 789     .name  = "QEMU PS/2 Mouse",
 790     .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
 791     .event = ps2_mouse_event,
 792     .sync  = ps2_mouse_sync,
 793 };
 794
 795 void *ps2_mouse_init(void (*update_irq)(void *, int), void *update_arg)
 796 {
 797     PS2MouseState *s = (PS2MouseState *)g_malloc0(sizeof(PS2MouseState));
 798
 799     trace_ps2_mouse_init(s);
 800     s->common.update_irq = update_irq;
 801     s->common.update_arg = update_arg;
 802     vmstate_register(NULL, 0, &vmstate_ps2_mouse, s);
 803     qemu_input_handler_register((DeviceState *)s,
 804                                 &ps2_mouse_handler);
 805     qemu_register_reset(ps2_mouse_reset, s);
 806     return s;
 807 }