1 /* 2 * QEMU USB emulation 3 * 4 * Copyright (c) 2005 Fabrice Bellard 5 * 6 * 2008 Generic packet handler rewrite by Max Krasnyansky 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a copy 9 * of this software and associated documentation files (the "Software"), to deal 10 * in the Software without restriction, including without limitation the rights 11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 * copies of the Software, and to permit persons to whom the Software is 13 * furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 * THE SOFTWARE. 25 */ 26 #include "qemu-common.h" 27 #include "usb.h" 28 #include "iov.h" 29 30 void usb_attach(USBPort *port) 31 { 32 USBDevice *dev = port->dev; 33 34 assert(dev != NULL); 35 assert(dev->attached); 36 assert(dev->state == USB_STATE_NOTATTACHED); 37 port->ops->attach(port); 38 dev->state = USB_STATE_ATTACHED; 39 usb_device_handle_attach(dev); 40 } 41 42 void usb_detach(USBPort *port) 43 { 44 USBDevice *dev = port->dev; 45 46 assert(dev != NULL); 47 assert(dev->state != USB_STATE_NOTATTACHED); 48 port->ops->detach(port); 49 dev->state = USB_STATE_NOTATTACHED; 50 } 51 52 void usb_port_reset(USBPort *port) 53 { 54 USBDevice *dev = port->dev; 55 56 assert(dev != NULL); 57 usb_detach(port); 58 usb_attach(port); 59 usb_device_reset(dev); 60 } 61 62 void usb_device_reset(USBDevice *dev) 63 { 64 if (dev == NULL || !dev->attached) { 65 return; 66 } 67 dev->remote_wakeup = 0; 68 dev->addr = 0; 69 dev->state = USB_STATE_DEFAULT; 70 usb_device_handle_reset(dev); 71 } 72 73 void usb_wakeup(USBDevice *dev) 74 { 75 if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) { 76 dev->port->ops->wakeup(dev->port); 77 } 78 } 79 80 /**********************/ 81 82 /* generic USB device helpers (you are not forced to use them when 83 writing your USB device driver, but they help handling the 84 protocol) 85 */ 86 87 #define SETUP_STATE_IDLE 0 88 #define SETUP_STATE_SETUP 1 89 #define SETUP_STATE_DATA 2 90 #define SETUP_STATE_ACK 3 91 92 static int do_token_setup(USBDevice *s, USBPacket *p) 93 { 94 int request, value, index; 95 int ret = 0; 96 97 if (p->iov.size != 8) { 98 return USB_RET_STALL; 99 } 100 101 usb_packet_copy(p, s->setup_buf, p->iov.size); 102 s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6]; 103 s->setup_index = 0; 104 105 request = (s->setup_buf[0] << 8) | s->setup_buf[1]; 106 value = (s->setup_buf[3] << 8) | s->setup_buf[2]; 107 index = (s->setup_buf[5] << 8) | s->setup_buf[4]; 108 109 if (s->setup_buf[0] & USB_DIR_IN) { 110 ret = usb_device_handle_control(s, p, request, value, index, 111 s->setup_len, s->data_buf); 112 if (ret == USB_RET_ASYNC) { 113 s->setup_state = SETUP_STATE_SETUP; 114 return USB_RET_ASYNC; 115 } 116 if (ret < 0) 117 return ret; 118 119 if (ret < s->setup_len) 120 s->setup_len = ret; 121 s->setup_state = SETUP_STATE_DATA; 122 } else { 123 if (s->setup_len > sizeof(s->data_buf)) { 124 fprintf(stderr, 125 "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n", 126 s->setup_len, sizeof(s->data_buf)); 127 return USB_RET_STALL; 128 } 129 if (s->setup_len == 0) 130 s->setup_state = SETUP_STATE_ACK; 131 else 132 s->setup_state = SETUP_STATE_DATA; 133 } 134 135 return ret; 136 } 137 138 static int do_token_in(USBDevice *s, USBPacket *p) 139 { 140 int request, value, index; 141 int ret = 0; 142 143 assert(p->ep->nr == 0); 144 145 request = (s->setup_buf[0] << 8) | s->setup_buf[1]; 146 value = (s->setup_buf[3] << 8) | s->setup_buf[2]; 147 index = (s->setup_buf[5] << 8) | s->setup_buf[4]; 148 149 switch(s->setup_state) { 150 case SETUP_STATE_ACK: 151 if (!(s->setup_buf[0] & USB_DIR_IN)) { 152 ret = usb_device_handle_control(s, p, request, value, index, 153 s->setup_len, s->data_buf); 154 if (ret == USB_RET_ASYNC) { 155 return USB_RET_ASYNC; 156 } 157 s->setup_state = SETUP_STATE_IDLE; 158 if (ret > 0) 159 return 0; 160 return ret; 161 } 162 163 /* return 0 byte */ 164 return 0; 165 166 case SETUP_STATE_DATA: 167 if (s->setup_buf[0] & USB_DIR_IN) { 168 int len = s->setup_len - s->setup_index; 169 if (len > p->iov.size) { 170 len = p->iov.size; 171 } 172 usb_packet_copy(p, s->data_buf + s->setup_index, len); 173 s->setup_index += len; 174 if (s->setup_index >= s->setup_len) 175 s->setup_state = SETUP_STATE_ACK; 176 return len; 177 } 178 179 s->setup_state = SETUP_STATE_IDLE; 180 return USB_RET_STALL; 181 182 default: 183 return USB_RET_STALL; 184 } 185 } 186 187 static int do_token_out(USBDevice *s, USBPacket *p) 188 { 189 assert(p->ep->nr == 0); 190 191 switch(s->setup_state) { 192 case SETUP_STATE_ACK: 193 if (s->setup_buf[0] & USB_DIR_IN) { 194 s->setup_state = SETUP_STATE_IDLE; 195 /* transfer OK */ 196 } else { 197 /* ignore additional output */ 198 } 199 return 0; 200 201 case SETUP_STATE_DATA: 202 if (!(s->setup_buf[0] & USB_DIR_IN)) { 203 int len = s->setup_len - s->setup_index; 204 if (len > p->iov.size) { 205 len = p->iov.size; 206 } 207 usb_packet_copy(p, s->data_buf + s->setup_index, len); 208 s->setup_index += len; 209 if (s->setup_index >= s->setup_len) 210 s->setup_state = SETUP_STATE_ACK; 211 return len; 212 } 213 214 s->setup_state = SETUP_STATE_IDLE; 215 return USB_RET_STALL; 216 217 default: 218 return USB_RET_STALL; 219 } 220 } 221 222 /* ctrl complete function for devices which use usb_generic_handle_packet and 223 may return USB_RET_ASYNC from their handle_control callback. Device code 224 which does this *must* call this function instead of the normal 225 usb_packet_complete to complete their async control packets. */ 226 void usb_generic_async_ctrl_complete(USBDevice *s, USBPacket *p) 227 { 228 if (p->result < 0) { 229 s->setup_state = SETUP_STATE_IDLE; 230 } 231 232 switch (s->setup_state) { 233 case SETUP_STATE_SETUP: 234 if (p->result < s->setup_len) { 235 s->setup_len = p->result; 236 } 237 s->setup_state = SETUP_STATE_DATA; 238 p->result = 8; 239 break; 240 241 case SETUP_STATE_ACK: 242 s->setup_state = SETUP_STATE_IDLE; 243 p->result = 0; 244 break; 245 246 default: 247 break; 248 } 249 usb_packet_complete(s, p); 250 } 251 252 /* XXX: fix overflow */ 253 int set_usb_string(uint8_t *buf, const char *str) 254 { 255 int len, i; 256 uint8_t *q; 257 258 q = buf; 259 len = strlen(str); 260 *q++ = 2 * len + 2; 261 *q++ = 3; 262 for(i = 0; i < len; i++) { 263 *q++ = str[i]; 264 *q++ = 0; 265 } 266 return q - buf; 267 } 268 269 USBDevice *usb_find_device(USBPort *port, uint8_t addr) 270 { 271 USBDevice *dev = port->dev; 272 273 if (dev == NULL || !dev->attached || dev->state != USB_STATE_DEFAULT) { 274 return NULL; 275 } 276 if (dev->addr == addr) { 277 return dev; 278 } 279 return usb_device_find_device(dev, addr); 280 } 281 282 /* Hand over a packet to a device for processing. Return value 283 USB_RET_ASYNC indicates the processing isn't finished yet, the 284 driver will call usb_packet_complete() when done processing it. */ 285 int usb_handle_packet(USBDevice *dev, USBPacket *p) 286 { 287 int ret; 288 289 if (dev == NULL) { 290 return USB_RET_NODEV; 291 } 292 assert(dev == p->ep->dev); 293 assert(dev->state == USB_STATE_DEFAULT); 294 assert(p->state == USB_PACKET_SETUP); 295 296 if (p->ep->nr == 0) { 297 /* control pipe */ 298 switch (p->pid) { 299 case USB_TOKEN_SETUP: 300 ret = do_token_setup(dev, p); 301 break; 302 case USB_TOKEN_IN: 303 ret = do_token_in(dev, p); 304 break; 305 case USB_TOKEN_OUT: 306 ret = do_token_out(dev, p); 307 break; 308 default: 309 ret = USB_RET_STALL; 310 break; 311 } 312 } else { 313 /* data pipe */ 314 ret = usb_device_handle_data(dev, p); 315 } 316 317 if (ret == USB_RET_ASYNC) { 318 p->state = USB_PACKET_ASYNC; 319 } 320 return ret; 321 } 322 323 /* Notify the controller that an async packet is complete. This should only 324 be called for packets previously deferred by returning USB_RET_ASYNC from 325 handle_packet. */ 326 void usb_packet_complete(USBDevice *dev, USBPacket *p) 327 { 328 assert(p->state == USB_PACKET_ASYNC); 329 p->state = USB_PACKET_COMPLETE; 330 dev->port->ops->complete(dev->port, p); 331 } 332 333 /* Cancel an active packet. The packed must have been deferred by 334 returning USB_RET_ASYNC from handle_packet, and not yet 335 completed. */ 336 void usb_cancel_packet(USBPacket * p) 337 { 338 assert(p->state == USB_PACKET_ASYNC); 339 p->state = USB_PACKET_CANCELED; 340 usb_device_cancel_packet(p->ep->dev, p); 341 } 342 343 344 void usb_packet_init(USBPacket *p) 345 { 346 qemu_iovec_init(&p->iov, 1); 347 } 348 349 void usb_packet_setup(USBPacket *p, int pid, USBEndpoint *ep) 350 { 351 assert(!usb_packet_is_inflight(p)); 352 p->state = USB_PACKET_SETUP; 353 p->pid = pid; 354 p->ep = ep; 355 p->result = 0; 356 qemu_iovec_reset(&p->iov); 357 } 358 359 void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len) 360 { 361 qemu_iovec_add(&p->iov, ptr, len); 362 } 363 364 void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes) 365 { 366 assert(p->result >= 0); 367 assert(p->result + bytes <= p->iov.size); 368 switch (p->pid) { 369 case USB_TOKEN_SETUP: 370 case USB_TOKEN_OUT: 371 iov_to_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes); 372 break; 373 case USB_TOKEN_IN: 374 iov_from_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes); 375 break; 376 default: 377 fprintf(stderr, "%s: invalid pid: %x\n", __func__, p->pid); 378 abort(); 379 } 380 p->result += bytes; 381 } 382 383 void usb_packet_skip(USBPacket *p, size_t bytes) 384 { 385 assert(p->result >= 0); 386 assert(p->result + bytes <= p->iov.size); 387 if (p->pid == USB_TOKEN_IN) { 388 iov_clear(p->iov.iov, p->iov.niov, p->result, bytes); 389 } 390 p->result += bytes; 391 } 392 393 void usb_packet_cleanup(USBPacket *p) 394 { 395 assert(!usb_packet_is_inflight(p)); 396 qemu_iovec_destroy(&p->iov); 397 } 398 399 void usb_ep_init(USBDevice *dev) 400 { 401 int ep; 402 403 dev->ep_ctl.nr = 0; 404 dev->ep_ctl.type = USB_ENDPOINT_XFER_CONTROL; 405 dev->ep_ctl.ifnum = 0; 406 dev->ep_ctl.dev = dev; 407 for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) { 408 dev->ep_in[ep].nr = ep + 1; 409 dev->ep_out[ep].nr = ep + 1; 410 dev->ep_in[ep].pid = USB_TOKEN_IN; 411 dev->ep_out[ep].pid = USB_TOKEN_OUT; 412 dev->ep_in[ep].type = USB_ENDPOINT_XFER_INVALID; 413 dev->ep_out[ep].type = USB_ENDPOINT_XFER_INVALID; 414 dev->ep_in[ep].ifnum = 0; 415 dev->ep_out[ep].ifnum = 0; 416 dev->ep_in[ep].dev = dev; 417 dev->ep_out[ep].dev = dev; 418 } 419 } 420 421 void usb_ep_dump(USBDevice *dev) 422 { 423 static const char *tname[] = { 424 [USB_ENDPOINT_XFER_CONTROL] = "control", 425 [USB_ENDPOINT_XFER_ISOC] = "isoc", 426 [USB_ENDPOINT_XFER_BULK] = "bulk", 427 [USB_ENDPOINT_XFER_INT] = "int", 428 }; 429 int ifnum, ep, first; 430 431 fprintf(stderr, "Device \"%s\", config %d\n", 432 dev->product_desc, dev->configuration); 433 for (ifnum = 0; ifnum < 16; ifnum++) { 434 first = 1; 435 for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) { 436 if (dev->ep_in[ep].type != USB_ENDPOINT_XFER_INVALID && 437 dev->ep_in[ep].ifnum == ifnum) { 438 if (first) { 439 first = 0; 440 fprintf(stderr, " Interface %d, alternative %d\n", 441 ifnum, dev->altsetting[ifnum]); 442 } 443 fprintf(stderr, " Endpoint %d, IN, %s, %d max\n", ep, 444 tname[dev->ep_in[ep].type], 445 dev->ep_in[ep].max_packet_size); 446 } 447 if (dev->ep_out[ep].type != USB_ENDPOINT_XFER_INVALID && 448 dev->ep_out[ep].ifnum == ifnum) { 449 if (first) { 450 first = 0; 451 fprintf(stderr, " Interface %d, alternative %d\n", 452 ifnum, dev->altsetting[ifnum]); 453 } 454 fprintf(stderr, " Endpoint %d, OUT, %s, %d max\n", ep, 455 tname[dev->ep_out[ep].type], 456 dev->ep_out[ep].max_packet_size); 457 } 458 } 459 } 460 fprintf(stderr, "--\n"); 461 } 462 463 struct USBEndpoint *usb_ep_get(USBDevice *dev, int pid, int ep) 464 { 465 struct USBEndpoint *eps; 466 467 if (dev == NULL) { 468 return NULL; 469 } 470 eps = (pid == USB_TOKEN_IN) ? dev->ep_in : dev->ep_out; 471 if (ep == 0) { 472 return &dev->ep_ctl; 473 } 474 assert(pid == USB_TOKEN_IN || pid == USB_TOKEN_OUT); 475 assert(ep > 0 && ep <= USB_MAX_ENDPOINTS); 476 return eps + ep - 1; 477 } 478 479 uint8_t usb_ep_get_type(USBDevice *dev, int pid, int ep) 480 { 481 struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); 482 return uep->type; 483 } 484 485 void usb_ep_set_type(USBDevice *dev, int pid, int ep, uint8_t type) 486 { 487 struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); 488 uep->type = type; 489 } 490 491 uint8_t usb_ep_get_ifnum(USBDevice *dev, int pid, int ep) 492 { 493 struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); 494 return uep->ifnum; 495 } 496 497 void usb_ep_set_ifnum(USBDevice *dev, int pid, int ep, uint8_t ifnum) 498 { 499 struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); 500 uep->ifnum = ifnum; 501 } 502 503 void usb_ep_set_max_packet_size(USBDevice *dev, int pid, int ep, 504 uint16_t raw) 505 { 506 struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); 507 int size, microframes; 508 509 size = raw & 0x7ff; 510 switch ((raw >> 11) & 3) { 511 case 1: 512 microframes = 2; 513 break; 514 case 2: 515 microframes = 3; 516 break; 517 default: 518 microframes = 1; 519 break; 520 } 521 uep->max_packet_size = size * microframes; 522 } 523 524 int usb_ep_get_max_packet_size(USBDevice *dev, int pid, int ep) 525 { 526 struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); 527 return uep->max_packet_size; 528 } 529