hid.c (18178B)
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. */ 39 static 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 0x88, 0x00, 0x00, 0x87, 0x00, 0x00, 0x00, 0x00, 55 0x00, 0x8a, 0x00, 0x8b, 0x00, 0x89, 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 75 bool hid_has_events(HIDState *hs) 76 { 77 return hs->n > 0 || hs->idle_pending; 78 } 79 80 static void hid_idle_timer(void *opaque) 81 { 82 HIDState *hs = opaque; 83 84 hs->idle_pending = true; 85 hs->event(hs); 86 } 87 88 static 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 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 [INPUT_BUTTON_SIDE] = 0x08, 118 [INPUT_BUTTON_EXTRA] = 0x10, 119 }; 120 HIDState *hs = (HIDState *)dev; 121 HIDPointerEvent *e; 122 InputMoveEvent *move; 123 InputBtnEvent *btn; 124 125 assert(hs->n < QUEUE_LENGTH); 126 e = &hs->ptr.queue[(hs->head + hs->n) & QUEUE_MASK]; 127 128 switch (evt->type) { 129 case INPUT_EVENT_KIND_REL: 130 move = evt->u.rel.data; 131 if (move->axis == INPUT_AXIS_X) { 132 e->xdx += move->value; 133 } else if (move->axis == INPUT_AXIS_Y) { 134 e->ydy += move->value; 135 } 136 break; 137 138 case INPUT_EVENT_KIND_ABS: 139 move = evt->u.abs.data; 140 if (move->axis == INPUT_AXIS_X) { 141 e->xdx = move->value; 142 } else if (move->axis == INPUT_AXIS_Y) { 143 e->ydy = move->value; 144 } 145 break; 146 147 case INPUT_EVENT_KIND_BTN: 148 btn = evt->u.btn.data; 149 if (btn->down) { 150 e->buttons_state |= bmap[btn->button]; 151 if (btn->button == INPUT_BUTTON_WHEEL_UP) { 152 e->dz--; 153 } else if (btn->button == INPUT_BUTTON_WHEEL_DOWN) { 154 e->dz++; 155 } 156 } else { 157 e->buttons_state &= ~bmap[btn->button]; 158 } 159 break; 160 161 default: 162 /* keep gcc happy */ 163 break; 164 } 165 166 } 167 168 static void hid_pointer_sync(DeviceState *dev) 169 { 170 HIDState *hs = (HIDState *)dev; 171 HIDPointerEvent *prev, *curr, *next; 172 bool event_compression = false; 173 174 if (hs->n == QUEUE_LENGTH-1) { 175 /* 176 * Queue full. We are losing information, but we at least 177 * keep track of most recent button state. 178 */ 179 return; 180 } 181 182 prev = &hs->ptr.queue[(hs->head + hs->n - 1) & QUEUE_MASK]; 183 curr = &hs->ptr.queue[(hs->head + hs->n) & QUEUE_MASK]; 184 next = &hs->ptr.queue[(hs->head + hs->n + 1) & QUEUE_MASK]; 185 186 if (hs->n > 0) { 187 /* 188 * No button state change between previous and current event 189 * (and previous wasn't seen by the guest yet), so there is 190 * motion information only and we can combine the two event 191 * into one. 192 */ 193 if (curr->buttons_state == prev->buttons_state) { 194 event_compression = true; 195 } 196 } 197 198 if (event_compression) { 199 /* add current motion to previous, clear current */ 200 if (hs->kind == HID_MOUSE) { 201 prev->xdx += curr->xdx; 202 curr->xdx = 0; 203 prev->ydy += curr->ydy; 204 curr->ydy = 0; 205 } else { 206 prev->xdx = curr->xdx; 207 prev->ydy = curr->ydy; 208 } 209 prev->dz += curr->dz; 210 curr->dz = 0; 211 } else { 212 /* prepate next (clear rel, copy abs + btns) */ 213 if (hs->kind == HID_MOUSE) { 214 next->xdx = 0; 215 next->ydy = 0; 216 } else { 217 next->xdx = curr->xdx; 218 next->ydy = curr->ydy; 219 } 220 next->dz = 0; 221 next->buttons_state = curr->buttons_state; 222 /* make current guest visible, notify guest */ 223 hs->n++; 224 hs->event(hs); 225 } 226 } 227 228 static void hid_keyboard_event(DeviceState *dev, QemuConsole *src, 229 InputEvent *evt) 230 { 231 HIDState *hs = (HIDState *)dev; 232 int scancodes[3], i, count; 233 int slot; 234 InputKeyEvent *key = evt->u.key.data; 235 236 count = qemu_input_key_value_to_scancode(key->key, 237 key->down, 238 scancodes); 239 if (hs->n + count > QUEUE_LENGTH) { 240 trace_hid_kbd_queue_full(); 241 return; 242 } 243 for (i = 0; i < count; i++) { 244 slot = (hs->head + hs->n) & QUEUE_MASK; hs->n++; 245 hs->kbd.keycodes[slot] = scancodes[i]; 246 } 247 hs->event(hs); 248 } 249 250 static void hid_keyboard_process_keycode(HIDState *hs) 251 { 252 uint8_t hid_code, index, key; 253 int i, keycode, slot; 254 255 if (hs->n == 0) { 256 return; 257 } 258 slot = hs->head & QUEUE_MASK; QUEUE_INCR(hs->head); hs->n--; 259 keycode = hs->kbd.keycodes[slot]; 260 261 if (!hs->n) { 262 trace_hid_kbd_queue_empty(); 263 } 264 265 key = keycode & 0x7f; 266 index = key | ((hs->kbd.modifiers & (1 << 8)) >> 1); 267 hid_code = hid_usage_keys[index]; 268 hs->kbd.modifiers &= ~(1 << 8); 269 270 switch (hid_code) { 271 case 0x00: 272 return; 273 274 case 0xe0: 275 assert(key == 0x1d); 276 if (hs->kbd.modifiers & (1 << 9)) { 277 /* The hid_codes for the 0xe1/0x1d scancode sequence are 0xe9/0xe0. 278 * Here we're processing the second hid_code. By dropping bit 9 279 * and setting bit 8, the scancode after 0x1d will access the 280 * second half of the table. 281 */ 282 hs->kbd.modifiers ^= (1 << 8) | (1 << 9); 283 return; 284 } 285 /* fall through to process Ctrl_L */ 286 case 0xe1 ... 0xe7: 287 /* Ctrl_L/Ctrl_R, Shift_L/Shift_R, Alt_L/Alt_R, Win_L/Win_R. 288 * Handle releases here, or fall through to process presses. 289 */ 290 if (keycode & (1 << 7)) { 291 hs->kbd.modifiers &= ~(1 << (hid_code & 0x0f)); 292 return; 293 } 294 /* fall through */ 295 case 0xe8 ... 0xe9: 296 /* USB modifiers are just 1 byte long. Bits 8 and 9 of 297 * hs->kbd.modifiers implement a state machine that detects the 298 * 0xe0 and 0xe1/0x1d sequences. These bits do not follow the 299 * usual rules where bit 7 marks released keys; they are cleared 300 * elsewhere in the function as the state machine dictates. 301 */ 302 hs->kbd.modifiers |= 1 << (hid_code & 0x0f); 303 return; 304 305 case 0xea ... 0xef: 306 abort(); 307 308 default: 309 break; 310 } 311 312 if (keycode & (1 << 7)) { 313 for (i = hs->kbd.keys - 1; i >= 0; i--) { 314 if (hs->kbd.key[i] == hid_code) { 315 hs->kbd.key[i] = hs->kbd.key[-- hs->kbd.keys]; 316 hs->kbd.key[hs->kbd.keys] = 0x00; 317 break; 318 } 319 } 320 if (i < 0) { 321 return; 322 } 323 } else { 324 for (i = hs->kbd.keys - 1; i >= 0; i--) { 325 if (hs->kbd.key[i] == hid_code) { 326 break; 327 } 328 } 329 if (i < 0) { 330 if (hs->kbd.keys < sizeof(hs->kbd.key)) { 331 hs->kbd.key[hs->kbd.keys++] = hid_code; 332 } 333 } else { 334 return; 335 } 336 } 337 } 338 339 static inline int int_clamp(int val, int vmin, int vmax) 340 { 341 if (val < vmin) { 342 return vmin; 343 } else if (val > vmax) { 344 return vmax; 345 } else { 346 return val; 347 } 348 } 349 350 void hid_pointer_activate(HIDState *hs) 351 { 352 if (!hs->ptr.mouse_grabbed) { 353 qemu_input_handler_activate(hs->s); 354 hs->ptr.mouse_grabbed = 1; 355 } 356 } 357 358 int hid_pointer_poll(HIDState *hs, uint8_t *buf, int len) 359 { 360 int dx, dy, dz, l; 361 int index; 362 HIDPointerEvent *e; 363 364 hs->idle_pending = false; 365 366 hid_pointer_activate(hs); 367 368 /* When the buffer is empty, return the last event. Relative 369 movements will all be zero. */ 370 index = (hs->n ? hs->head : hs->head - 1); 371 e = &hs->ptr.queue[index & QUEUE_MASK]; 372 373 if (hs->kind == HID_MOUSE) { 374 dx = int_clamp(e->xdx, -127, 127); 375 dy = int_clamp(e->ydy, -127, 127); 376 e->xdx -= dx; 377 e->ydy -= dy; 378 } else { 379 dx = e->xdx; 380 dy = e->ydy; 381 } 382 dz = int_clamp(e->dz, -127, 127); 383 e->dz -= dz; 384 385 if (hs->n && 386 !e->dz && 387 (hs->kind == HID_TABLET || (!e->xdx && !e->ydy))) { 388 /* that deals with this event */ 389 QUEUE_INCR(hs->head); 390 hs->n--; 391 } 392 393 /* Appears we have to invert the wheel direction */ 394 dz = 0 - dz; 395 l = 0; 396 switch (hs->kind) { 397 case HID_MOUSE: 398 if (len > l) { 399 buf[l++] = e->buttons_state; 400 } 401 if (len > l) { 402 buf[l++] = dx; 403 } 404 if (len > l) { 405 buf[l++] = dy; 406 } 407 if (len > l) { 408 buf[l++] = dz; 409 } 410 break; 411 412 case HID_TABLET: 413 if (len > l) { 414 buf[l++] = e->buttons_state; 415 } 416 if (len > l) { 417 buf[l++] = dx & 0xff; 418 } 419 if (len > l) { 420 buf[l++] = dx >> 8; 421 } 422 if (len > l) { 423 buf[l++] = dy & 0xff; 424 } 425 if (len > l) { 426 buf[l++] = dy >> 8; 427 } 428 if (len > l) { 429 buf[l++] = dz; 430 } 431 break; 432 433 default: 434 abort(); 435 } 436 437 return l; 438 } 439 440 int hid_keyboard_poll(HIDState *hs, uint8_t *buf, int len) 441 { 442 hs->idle_pending = false; 443 444 if (len < 2) { 445 return 0; 446 } 447 448 hid_keyboard_process_keycode(hs); 449 450 buf[0] = hs->kbd.modifiers & 0xff; 451 buf[1] = 0; 452 if (hs->kbd.keys > 6) { 453 memset(buf + 2, HID_USAGE_ERROR_ROLLOVER, MIN(8, len) - 2); 454 } else { 455 memcpy(buf + 2, hs->kbd.key, MIN(8, len) - 2); 456 } 457 458 return MIN(8, len); 459 } 460 461 int hid_keyboard_write(HIDState *hs, uint8_t *buf, int len) 462 { 463 if (len > 0) { 464 int ledstate = 0; 465 /* 0x01: Num Lock LED 466 * 0x02: Caps Lock LED 467 * 0x04: Scroll Lock LED 468 * 0x08: Compose LED 469 * 0x10: Kana LED */ 470 hs->kbd.leds = buf[0]; 471 if (hs->kbd.leds & 0x04) { 472 ledstate |= QEMU_SCROLL_LOCK_LED; 473 } 474 if (hs->kbd.leds & 0x01) { 475 ledstate |= QEMU_NUM_LOCK_LED; 476 } 477 if (hs->kbd.leds & 0x02) { 478 ledstate |= QEMU_CAPS_LOCK_LED; 479 } 480 kbd_put_ledstate(ledstate); 481 } 482 return 0; 483 } 484 485 void hid_reset(HIDState *hs) 486 { 487 switch (hs->kind) { 488 case HID_KEYBOARD: 489 memset(hs->kbd.keycodes, 0, sizeof(hs->kbd.keycodes)); 490 memset(hs->kbd.key, 0, sizeof(hs->kbd.key)); 491 hs->kbd.keys = 0; 492 hs->kbd.modifiers = 0; 493 break; 494 case HID_MOUSE: 495 case HID_TABLET: 496 memset(hs->ptr.queue, 0, sizeof(hs->ptr.queue)); 497 break; 498 } 499 hs->head = 0; 500 hs->n = 0; 501 hs->protocol = 1; 502 hs->idle = 0; 503 hs->idle_pending = false; 504 hid_del_idle_timer(hs); 505 } 506 507 void hid_free(HIDState *hs) 508 { 509 qemu_input_handler_unregister(hs->s); 510 hid_del_idle_timer(hs); 511 } 512 513 static QemuInputHandler hid_keyboard_handler = { 514 .name = "QEMU HID Keyboard", 515 .mask = INPUT_EVENT_MASK_KEY, 516 .event = hid_keyboard_event, 517 }; 518 519 static QemuInputHandler hid_mouse_handler = { 520 .name = "QEMU HID Mouse", 521 .mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL, 522 .event = hid_pointer_event, 523 .sync = hid_pointer_sync, 524 }; 525 526 static QemuInputHandler hid_tablet_handler = { 527 .name = "QEMU HID Tablet", 528 .mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS, 529 .event = hid_pointer_event, 530 .sync = hid_pointer_sync, 531 }; 532 533 void hid_init(HIDState *hs, int kind, HIDEventFunc event) 534 { 535 hs->kind = kind; 536 hs->event = event; 537 538 if (hs->kind == HID_KEYBOARD) { 539 hs->s = qemu_input_handler_register((DeviceState *)hs, 540 &hid_keyboard_handler); 541 qemu_input_handler_activate(hs->s); 542 } else if (hs->kind == HID_MOUSE) { 543 hs->s = qemu_input_handler_register((DeviceState *)hs, 544 &hid_mouse_handler); 545 } else if (hs->kind == HID_TABLET) { 546 hs->s = qemu_input_handler_register((DeviceState *)hs, 547 &hid_tablet_handler); 548 } 549 } 550 551 static int hid_post_load(void *opaque, int version_id) 552 { 553 HIDState *s = opaque; 554 555 hid_set_next_idle(s); 556 557 if (s->n == QUEUE_LENGTH && (s->kind == HID_TABLET || 558 s->kind == HID_MOUSE)) { 559 /* 560 * Handle ptr device migration from old qemu with full queue. 561 * 562 * Throw away everything but the last event, so we propagate 563 * at least the current button state to the guest. Also keep 564 * current position for the tablet, signal "no motion" for the 565 * mouse. 566 */ 567 HIDPointerEvent evt; 568 evt = s->ptr.queue[(s->head+s->n) & QUEUE_MASK]; 569 if (s->kind == HID_MOUSE) { 570 evt.xdx = 0; 571 evt.ydy = 0; 572 } 573 s->ptr.queue[0] = evt; 574 s->head = 0; 575 s->n = 1; 576 } 577 return 0; 578 } 579 580 static const VMStateDescription vmstate_hid_ptr_queue = { 581 .name = "HIDPointerEventQueue", 582 .version_id = 1, 583 .minimum_version_id = 1, 584 .fields = (VMStateField[]) { 585 VMSTATE_INT32(xdx, HIDPointerEvent), 586 VMSTATE_INT32(ydy, HIDPointerEvent), 587 VMSTATE_INT32(dz, HIDPointerEvent), 588 VMSTATE_INT32(buttons_state, HIDPointerEvent), 589 VMSTATE_END_OF_LIST() 590 } 591 }; 592 593 const VMStateDescription vmstate_hid_ptr_device = { 594 .name = "HIDPointerDevice", 595 .version_id = 1, 596 .minimum_version_id = 1, 597 .post_load = hid_post_load, 598 .fields = (VMStateField[]) { 599 VMSTATE_STRUCT_ARRAY(ptr.queue, HIDState, QUEUE_LENGTH, 0, 600 vmstate_hid_ptr_queue, HIDPointerEvent), 601 VMSTATE_UINT32(head, HIDState), 602 VMSTATE_UINT32(n, HIDState), 603 VMSTATE_INT32(protocol, HIDState), 604 VMSTATE_UINT8(idle, HIDState), 605 VMSTATE_END_OF_LIST(), 606 } 607 }; 608 609 const VMStateDescription vmstate_hid_keyboard_device = { 610 .name = "HIDKeyboardDevice", 611 .version_id = 1, 612 .minimum_version_id = 1, 613 .post_load = hid_post_load, 614 .fields = (VMStateField[]) { 615 VMSTATE_UINT32_ARRAY(kbd.keycodes, HIDState, QUEUE_LENGTH), 616 VMSTATE_UINT32(head, HIDState), 617 VMSTATE_UINT32(n, HIDState), 618 VMSTATE_UINT16(kbd.modifiers, HIDState), 619 VMSTATE_UINT8(kbd.leds, HIDState), 620 VMSTATE_UINT8_ARRAY(kbd.key, HIDState, 16), 621 VMSTATE_INT32(kbd.keys, HIDState), 622 VMSTATE_INT32(protocol, HIDState), 623 VMSTATE_UINT8(idle, HIDState), 624 VMSTATE_END_OF_LIST(), 625 } 626 };