usb-linux.c

   1 /*
   2  * Linux host USB redirector
   3  *
   4  * Copyright (c) 2005 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 "vl.h"
  25
  26 #if defined(__linux__)
  27 #include <dirent.h>
  28 #include <sys/ioctl.h>
  29 #include <linux/usbdevice_fs.h>
  30 #include <linux/version.h>
  31 #include <signal.h>
  32
  33 /* We redefine it to avoid version problems */
  34 struct usb_ctrltransfer {
  35     uint8_t  bRequestType;
  36     uint8_t  bRequest;
  37     uint16_t wValue;
  38     uint16_t wIndex;
  39     uint16_t wLength;
  40     uint32_t timeout;
  41     void *data;
  42 };
  43
  44 typedef int USBScanFunc(void *opaque, int bus_num, int addr, int class_id,
  45                         int vendor_id, int product_id,
  46                         const char *product_name, int speed);
  47 static int usb_host_find_device(int *pbus_num, int *paddr,
  48                                 char *product_name, int product_name_size,
  49                                 const char *devname);
  50
  51 //#define DEBUG
  52 //#define DEBUG_ISOCH
  53 //#define USE_ASYNCIO
  54
  55 #define USBDEVFS_PATH "/proc/bus/usb"
  56 #define PRODUCT_NAME_SZ 32
  57 #define SIG_ISOCOMPLETE (SIGRTMIN+7)
  58 #define MAX_ENDPOINTS 16
  59
  60 struct sigaction sigact;
  61
  62 /* endpoint association data */
  63 struct endp_data {
  64     uint8_t type;
  65 };
  66
  67 /* FIXME: move USBPacket to PendingURB */
  68 typedef struct USBHostDevice {
  69     USBDevice dev;
  70     int fd;
  71     USBPacket *packet;
  72     struct endp_data endp_table[MAX_ENDPOINTS];
  73     int configuration;
  74     uint8_t descr[1024];
  75     int descr_len;
  76     int urbs_ready;
  77 } USBHostDevice;
  78
  79 typedef struct PendingURB {
  80     struct usbdevfs_urb *urb;
  81     USBHostDevice *dev;
  82     QEMUBH *bh;
  83     int status;
  84     struct PendingURB *next;
  85 } PendingURB;
  86
  87 static PendingURB *pending_urbs = NULL;
  88
  89 static int add_pending_urb(struct usbdevfs_urb *urb)
  90 {
  91     PendingURB *purb = qemu_mallocz(sizeof(PendingURB));
  92     if (purb) {
  93         purb->urb = urb;
  94         purb->dev = NULL;
  95         purb->bh = NULL;
  96         purb->status = 0;
  97         purb->next = pending_urbs;
  98         pending_urbs = purb;
  99         return 1;
 100     }
 101     return 0;
 102 }
 103
 104 static int del_pending_urb(struct usbdevfs_urb *urb)
 105 {
 106     PendingURB *purb = pending_urbs;
 107     PendingURB *prev = NULL;
 108
 109     while (purb && purb->urb != urb) {
 110         prev = purb;
 111         purb = purb->next;
 112     }
 113
 114     if (purb && purb->urb == urb) {
 115         if (prev) {
 116             prev->next = purb->next;
 117         } else {
 118             pending_urbs = purb->next;
 119         }
 120         qemu_free(purb);
 121         return 1;
 122     }
 123     return 0;
 124 }
 125
 126 #ifdef USE_ASYNCIO
 127 static PendingURB *get_pending_urb(struct usbdevfs_urb *urb)
 128 {
 129     PendingURB *purb = pending_urbs;
 130
 131     while (purb && purb->urb != urb) {
 132         purb = purb->next;
 133     }
 134
 135     if (purb && purb->urb == urb) {
 136         return purb;
 137     }
 138     return NULL;
 139 }
 140 #endif
 141
 142 static int usb_host_update_interfaces(USBHostDevice *dev, int configuration)
 143 {
 144     int dev_descr_len, config_descr_len;
 145     int interface, nb_interfaces, nb_configurations;
 146     int ret, i;
 147
 148     if (configuration == 0) /* address state - ignore */
 149         return 1;
 150
 151     i = 0;
 152     dev_descr_len = dev->descr[0];
 153     if (dev_descr_len > dev->descr_len)
 154         goto fail;
 155     nb_configurations = dev->descr[17];
 156
 157     i += dev_descr_len;
 158     while (i < dev->descr_len) {
 159 #ifdef DEBUG
 160         printf("i is %d, descr_len is %d, dl %d, dt %d\n", i, dev->descr_len,
 161                dev->descr[i], dev->descr[i+1]);
 162 #endif
 163         if (dev->descr[i+1] != USB_DT_CONFIG) {
 164             i += dev->descr[i];
 165             continue;
 166         }
 167         config_descr_len = dev->descr[i];
 168
 169         if (configuration == dev->descr[i + 5])
 170             break;
 171
 172         i += config_descr_len;
 173     }
 174
 175     if (i >= dev->descr_len) {
 176         printf("usb_host: error - device has no matching configuration\n");
 177         goto fail;
 178     }
 179     nb_interfaces = dev->descr[i + 4];
 180
 181 #ifdef USBDEVFS_DISCONNECT
 182     /* earlier Linux 2.4 do not support that */
 183     {
 184         struct usbdevfs_ioctl ctrl;
 185         for (interface = 0; interface < nb_interfaces; interface++) {
 186             ctrl.ioctl_code = USBDEVFS_DISCONNECT;
 187             ctrl.ifno = interface;
 188             ret = ioctl(dev->fd, USBDEVFS_IOCTL, &ctrl);
 189             if (ret < 0 && errno != ENODATA) {
 190                 perror("USBDEVFS_DISCONNECT");
 191                 goto fail;
 192             }
 193         }
 194     }
 195 #endif
 196
 197     /* XXX: only grab if all interfaces are free */
 198     for (interface = 0; interface < nb_interfaces; interface++) {
 199         ret = ioctl(dev->fd, USBDEVFS_CLAIMINTERFACE, &interface);
 200         if (ret < 0) {
 201             if (errno == EBUSY) {
 202                 fprintf(stderr,
 203                         "usb_host: warning - device already grabbed\n");
 204             } else {
 205                 perror("USBDEVFS_CLAIMINTERFACE");
 206             }
 207         fail:
 208             return 0;
 209         }
 210     }
 211
 212 #ifdef DEBUG
 213     printf("usb_host: %d interfaces claimed for configuration %d\n",
 214            nb_interfaces, configuration);
 215 #endif
 216
 217     return 1;
 218 }
 219
 220 static void usb_host_handle_reset(USBDevice *dev)
 221 {
 222 #if 0
 223     USBHostDevice *s = (USBHostDevice *)dev;
 224     /* USBDEVFS_RESET, but not the first time as it has already be
 225        done by the host OS */
 226     ioctl(s->fd, USBDEVFS_RESET);
 227 #endif
 228 }
 229
 230 static void usb_host_handle_destroy(USBDevice *dev)
 231 {
 232     USBHostDevice *s = (USBHostDevice *)dev;
 233
 234     if (s->fd >= 0)
 235         close(s->fd);
 236     qemu_free(s);
 237 }
 238
 239 static int usb_linux_update_endp_table(USBHostDevice *s);
 240
 241 static int usb_host_handle_control(USBDevice *dev,
 242                                    int request,
 243                                    int value,
 244                                    int index,
 245                                    int length,
 246                                    uint8_t *data)
 247 {
 248     USBHostDevice *s = (USBHostDevice *)dev;
 249     struct usb_ctrltransfer ct;
 250     struct usbdevfs_setinterface si;
 251     int intf_update_required = 0;
 252     int ret;
 253
 254     if (request == (DeviceOutRequest | USB_REQ_SET_ADDRESS)) {
 255         /* specific SET_ADDRESS support */
 256         dev->addr = value;
 257         return 0;
 258     } else if (request == ((USB_RECIP_INTERFACE << 8) |
 259                            USB_REQ_SET_INTERFACE)) {
 260         /* set alternate setting for the interface */
 261         si.interface = index;
 262         si.altsetting = value;
 263         ret = ioctl(s->fd, USBDEVFS_SETINTERFACE, &si);
 264         usb_linux_update_endp_table(s);
 265     } else if (request == (DeviceOutRequest | USB_REQ_SET_CONFIGURATION)) {
 266 #ifdef DEBUG
 267         printf("usb_host_handle_control: SET_CONFIGURATION request - "
 268                "config %d\n", value & 0xff);
 269 #endif
 270         if (s->configuration != (value & 0xff)) {
 271             s->configuration = (value & 0xff);
 272             intf_update_required = 1;
 273         }
 274         goto do_request;
 275     } else {
 276     do_request:
 277         ct.bRequestType = request >> 8;
 278         ct.bRequest = request;
 279         ct.wValue = value;
 280         ct.wIndex = index;
 281         ct.wLength = length;
 282         ct.timeout = 50;
 283         ct.data = data;
 284         ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 285     }
 286
 287     if (ret < 0) {
 288         switch(errno) {
 289         case ETIMEDOUT:
 290             return USB_RET_NAK;
 291         default:
 292             return USB_RET_STALL;
 293         }
 294     } else {
 295         if (intf_update_required) {
 296 #ifdef DEBUG
 297             printf("usb_host_handle_control: updating interfaces\n");
 298 #endif
 299             usb_host_update_interfaces(s, value & 0xff);
 300         }
 301         return ret;
 302     }
 303 }
 304
 305 static int usb_host_handle_isoch(USBDevice *dev, USBPacket *p);
 306
 307 static int usb_host_handle_data(USBDevice *dev, USBPacket *p)
 308 {
 309     USBHostDevice *s = (USBHostDevice *)dev;
 310     struct usbdevfs_bulktransfer bt;
 311     int ret;
 312     uint8_t devep = p->devep;
 313
 314     if (s->endp_table[p->devep - 1].type == USBDEVFS_URB_TYPE_ISO) {
 315         return usb_host_handle_isoch(dev, p);
 316     }
 317
 318     /* XXX: optimize and handle all data types by looking at the
 319        config descriptor */
 320     if (p->pid == USB_TOKEN_IN)
 321         devep |= 0x80;
 322     bt.ep = devep;
 323     bt.len = p->len;
 324     bt.timeout = 50;
 325     bt.data = p->data;
 326     ret = ioctl(s->fd, USBDEVFS_BULK, &bt);
 327     if (ret < 0) {
 328         switch(errno) {
 329         case ETIMEDOUT:
 330             return USB_RET_NAK;
 331         case EPIPE:
 332         default:
 333 #ifdef DEBUG
 334             printf("handle_data: errno=%d\n", errno);
 335 #endif
 336             return USB_RET_STALL;
 337         }
 338     } else {
 339         return ret;
 340     }
 341 }
 342
 343 #ifdef USE_ASYNCIO
 344 static void usb_linux_bh_cb(void *opaque)
 345 {
 346     PendingURB *pending_urb = (PendingURB *)opaque;
 347     USBHostDevice *s = pending_urb->dev;
 348     struct usbdevfs_urb *purb = NULL;
 349     USBPacket *p = s->packet;
 350     int ret;
 351
 352     /* FIXME: handle purb->status */
 353     qemu_free(pending_urb->bh);
 354     del_pending_urb(pending_urb->urb);
 355
 356     if (!p) {
 357         s->urbs_ready++;
 358         return;
 359     }
 360
 361     ret = ioctl(s->fd, USBDEVFS_REAPURBNDELAY, &purb);
 362     if (ret < 0) {
 363         printf("usb_linux_bh_cb: REAPURBNDELAY ioctl=%d errno=%d\n",
 364                ret, errno);
 365         return;
 366     }
 367
 368 #ifdef DEBUG_ISOCH
 369     if (purb == pending_urb->urb) {
 370         printf("usb_linux_bh_cb: urb mismatch reaped=%p pending=%p\n",
 371                purb, urb);
 372     }
 373 #endif
 374
 375     p->len = purb->actual_length;
 376     usb_packet_complete(p);
 377     qemu_free(purb);
 378     s->packet = NULL;
 379 }
 380
 381 static void isoch_done(int signum, siginfo_t *info, void *context)
 382 {
 383     struct usbdevfs_urb *urb = (struct usbdevfs_urb *)info->si_addr;
 384     USBHostDevice *s = (USBHostDevice *)urb->usercontext;
 385     PendingURB *purb;
 386
 387     if (info->si_code != SI_ASYNCIO ||
 388         info->si_signo != SIG_ISOCOMPLETE) {
 389         return;
 390     }
 391
 392     purb = get_pending_urb(urb);
 393     if (purb) {
 394         purb->bh = qemu_bh_new(usb_linux_bh_cb, purb);
 395         if (purb->bh) {
 396             purb->dev = s;
 397             purb->status = info->si_errno;
 398             qemu_bh_schedule(purb->bh);
 399         }
 400     }
 401 }
 402 #endif
 403
 404 static int usb_host_handle_isoch(USBDevice *dev, USBPacket *p)
 405 {
 406     USBHostDevice *s = (USBHostDevice *)dev;
 407     struct usbdevfs_urb *urb, *purb = NULL;
 408     int ret;
 409     uint8_t devep = p->devep;
 410
 411     if (p->pid == USB_TOKEN_IN)
 412         devep |= 0x80;
 413
 414     urb = qemu_mallocz(sizeof(struct usbdevfs_urb) +
 415                        sizeof(struct usbdevfs_iso_packet_desc));
 416     if (!urb) {
 417         printf("usb_host_handle_isoch: malloc failed\n");
 418         return 0;
 419     }
 420
 421     urb->type = USBDEVFS_URB_TYPE_ISO;
 422     urb->endpoint = devep;
 423     urb->status = 0;
 424     urb->flags = USBDEVFS_URB_ISO_ASAP;
 425     urb->buffer = p->data;
 426     urb->buffer_length = p->len;
 427     urb->actual_length = 0;
 428     urb->start_frame = 0;
 429     urb->error_count = 0;
 430 #ifdef USE_ASYNCIO
 431     urb->signr = SIG_ISOCOMPLETE;
 432 #else
 433     urb->signr = 0;
 434 #endif
 435     urb->usercontext = s;
 436     urb->number_of_packets = 1;
 437     urb->iso_frame_desc[0].length = p->len;
 438     urb->iso_frame_desc[0].actual_length = 0;
 439     urb->iso_frame_desc[0].status = 0;
 440     ret = ioctl(s->fd, USBDEVFS_SUBMITURB, urb);
 441     if (ret == 0) {
 442         if (!add_pending_urb(urb)) {
 443             printf("usb_host_handle_isoch: add_pending_urb failed %p\n", urb);
 444         }
 445     } else {
 446         printf("usb_host_handle_isoch: SUBMITURB ioctl=%d errno=%d\n",
 447                ret, errno);
 448         qemu_free(urb);
 449         switch(errno) {
 450         case ETIMEDOUT:
 451             return USB_RET_NAK;
 452         case EPIPE:
 453         default:
 454             return USB_RET_STALL;
 455         }
 456     }
 457 #ifdef USE_ASYNCIO
 458     /* FIXME: handle urbs_ready together with sync io
 459      * workaround for injecting the signaled urbs into current frame */
 460     if (s->urbs_ready > 0) {
 461         ret = ioctl(s->fd, USBDEVFS_REAPURBNDELAY, &purb);
 462         if (ret == 0) {
 463             ret = purb->actual_length;
 464             qemu_free(purb);
 465             s->urbs_ready--;
 466         }
 467         return ret;
 468     }
 469     s->packet = p;
 470     return USB_RET_ASYNC;
 471 #else
 472     ret = ioctl(s->fd, USBDEVFS_REAPURBNDELAY, &purb);
 473     if (ret == 0) {
 474         if (del_pending_urb(purb)) {
 475             ret = purb->actual_length;
 476             qemu_free(purb);
 477         } else {
 478             printf("usb_host_handle_isoch: del_pending_urb failed %p\n", purb);
 479         }
 480     } else {
 481 #ifdef DEBUG_ISOCH
 482         printf("usb_host_handle_isoch: REAPURBNDELAY ioctl=%d errno=%d\n",
 483                ret, errno);
 484 #endif
 485     }
 486     return ret;
 487 #endif
 488 }
 489
 490 /* returns 1 on problem encountered or 0 for success */
 491 static int usb_linux_update_endp_table(USBHostDevice *s)
 492 {
 493     uint8_t *descriptors;
 494     uint8_t devep, type, configuration, alt_interface;
 495     struct usb_ctrltransfer ct;
 496     int interface, ret, length, i;
 497
 498     ct.bRequestType = USB_DIR_IN;
 499     ct.bRequest = USB_REQ_GET_CONFIGURATION;
 500     ct.wValue = 0;
 501     ct.wIndex = 0;
 502     ct.wLength = 1;
 503     ct.data = &configuration;
 504     ct.timeout = 50;
 505
 506     ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 507     if (ret < 0) {
 508         perror("usb_linux_update_endp_table");
 509         return 1;
 510     }
 511
 512     /* in address state */
 513     if (configuration == 0)
 514         return 1;
 515
 516     /* get the desired configuration, interface, and endpoint descriptors
 517      * from device description */
 518     descriptors = &s->descr[18];
 519     length = s->descr_len - 18;
 520     i = 0;
 521
 522     if (descriptors[i + 1] != USB_DT_CONFIG ||
 523         descriptors[i + 5] != configuration) {
 524         printf("invalid descriptor data - configuration\n");
 525         return 1;
 526     }
 527     i += descriptors[i];
 528
 529     while (i < length) {
 530         if (descriptors[i + 1] != USB_DT_INTERFACE ||
 531             (descriptors[i + 1] == USB_DT_INTERFACE &&
 532              descriptors[i + 4] == 0)) {
 533             i += descriptors[i];
 534             continue;
 535         }
 536
 537         interface = descriptors[i + 2];
 538
 539         ct.bRequestType = USB_DIR_IN | USB_RECIP_INTERFACE;
 540         ct.bRequest = USB_REQ_GET_INTERFACE;
 541         ct.wValue = 0;
 542         ct.wIndex = interface;
 543         ct.wLength = 1;
 544         ct.data = &alt_interface;
 545         ct.timeout = 50;
 546
 547         ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 548         if (ret < 0) {
 549             perror("usb_linux_update_endp_table");
 550             return 1;
 551         }
 552
 553         /* the current interface descriptor is the active interface
 554          * and has endpoints */
 555         if (descriptors[i + 3] != alt_interface) {
 556             i += descriptors[i];
 557             continue;
 558         }
 559
 560         /* advance to the endpoints */
 561         while (i < length && descriptors[i +1] != USB_DT_ENDPOINT)
 562             i += descriptors[i];
 563
 564         if (i >= length)
 565             break;
 566
 567         while (i < length) {
 568             if (descriptors[i + 1] != USB_DT_ENDPOINT)
 569                 break;
 570
 571             devep = descriptors[i + 2];
 572             switch (descriptors[i + 3] & 0x3) {
 573             case 0x00:
 574                 type = USBDEVFS_URB_TYPE_CONTROL;
 575                 break;
 576             case 0x01:
 577                 type = USBDEVFS_URB_TYPE_ISO;
 578                 break;
 579             case 0x02:
 580                 type = USBDEVFS_URB_TYPE_BULK;
 581                 break;
 582             case 0x03:
 583                 type = USBDEVFS_URB_TYPE_INTERRUPT;
 584                 break;
 585             default:
 586                 printf("usb_host: malformed endpoint type\n");
 587                 type = USBDEVFS_URB_TYPE_BULK;
 588             }
 589             s->endp_table[(devep & 0xf) - 1].type = type;
 590
 591             i += descriptors[i];
 592         }
 593     }
 594     return 0;
 595 }
 596
 597 /* XXX: exclude high speed devices or implement EHCI */
 598 USBDevice *usb_host_device_open(const char *devname)
 599 {
 600     int fd = -1, ret;
 601     USBHostDevice *dev = NULL;
 602     struct usbdevfs_connectinfo ci;
 603     char buf[1024];
 604     int bus_num, addr;
 605     char product_name[PRODUCT_NAME_SZ];
 606
 607     dev = qemu_mallocz(sizeof(USBHostDevice));
 608     if (!dev)
 609         goto fail;
 610
 611 #ifdef DEBUG_ISOCH
 612     printf("usb_host_device_open %s\n", devname);
 613 #endif
 614     if (usb_host_find_device(&bus_num, &addr,
 615                              product_name, sizeof(product_name),
 616                              devname) < 0)
 617         return NULL;
 618
 619     snprintf(buf, sizeof(buf), USBDEVFS_PATH "/%03d/%03d",
 620              bus_num, addr);
 621     fd = open(buf, O_RDWR | O_NONBLOCK);
 622     if (fd < 0) {
 623         perror(buf);
 624         return NULL;
 625     }
 626
 627     /* read the device description */
 628     dev->descr_len = read(fd, dev->descr, sizeof(dev->descr));
 629     if (dev->descr_len <= 0) {
 630         perror("usb_host_update_interfaces: reading device data failed");
 631         goto fail;
 632     }
 633
 634 #ifdef DEBUG
 635     {
 636         int x;
 637         printf("=== begin dumping device descriptor data ===\n");
 638         for (x = 0; x < dev->descr_len; x++)
 639             printf("%02x ", dev->descr[x]);
 640         printf("\n=== end dumping device descriptor data ===\n");
 641     }
 642 #endif
 643
 644     dev->fd = fd;
 645     dev->configuration = 1;
 646
 647     /* XXX - do something about initial configuration */
 648     if (!usb_host_update_interfaces(dev, 1))
 649         goto fail;
 650
 651     ret = ioctl(fd, USBDEVFS_CONNECTINFO, &ci);
 652     if (ret < 0) {
 653         perror("USBDEVFS_CONNECTINFO");
 654         goto fail;
 655     }
 656
 657 #ifdef DEBUG
 658     printf("host USB device %d.%d grabbed\n", bus_num, addr);
 659 #endif
 660
 661     ret = usb_linux_update_endp_table(dev);
 662     if (ret)
 663         goto fail;
 664
 665     if (ci.slow)
 666         dev->dev.speed = USB_SPEED_LOW;
 667     else
 668         dev->dev.speed = USB_SPEED_HIGH;
 669     dev->dev.handle_packet = usb_generic_handle_packet;
 670
 671     dev->dev.handle_reset = usb_host_handle_reset;
 672     dev->dev.handle_control = usb_host_handle_control;
 673     dev->dev.handle_data = usb_host_handle_data;
 674     dev->dev.handle_destroy = usb_host_handle_destroy;
 675
 676     if (product_name[0] == '\0')
 677         snprintf(dev->dev.devname, sizeof(dev->dev.devname),
 678                  "host:%s", devname);
 679     else
 680         pstrcpy(dev->dev.devname, sizeof(dev->dev.devname),
 681                 product_name);
 682
 683 #ifdef USE_ASYNCIO
 684     /* set up the signal handlers */
 685     sigemptyset(&sigact.sa_mask);
 686     sigact.sa_sigaction = isoch_done;
 687     sigact.sa_flags = SA_SIGINFO;
 688     sigact.sa_restorer = 0;
 689     ret = sigaction(SIG_ISOCOMPLETE, &sigact, NULL);
 690     if (ret < 0) {
 691         printf("sigaction SIG_ISOCOMPLETE=%d errno=%d\n", ret, errno);
 692     }
 693 #endif
 694     dev->urbs_ready = 0;
 695     return (USBDevice *)dev;
 696 fail:
 697     if (dev)
 698         qemu_free(dev);
 699     close(fd);
 700     return NULL;
 701 }
 702
 703 static int get_tag_value(char *buf, int buf_size,
 704                          const char *str, const char *tag,
 705                          const char *stopchars)
 706 {
 707     const char *p;
 708     char *q;
 709     p = strstr(str, tag);
 710     if (!p)
 711         return -1;
 712     p += strlen(tag);
 713     while (isspace(*p))
 714         p++;
 715     q = buf;
 716     while (*p != '\0' && !strchr(stopchars, *p)) {
 717         if ((q - buf) < (buf_size - 1))
 718             *q++ = *p;
 719         p++;
 720     }
 721     *q = '\0';
 722     return q - buf;
 723 }
 724
 725 static int usb_host_scan(void *opaque, USBScanFunc *func)
 726 {
 727     FILE *f;
 728     char line[1024];
 729     char buf[1024];
 730     int bus_num, addr, speed, device_count, class_id, product_id, vendor_id;
 731     int ret;
 732     char product_name[512];
 733
 734     f = fopen(USBDEVFS_PATH "/devices", "r");
 735     if (!f) {
 736         term_printf("Could not open %s\n", USBDEVFS_PATH "/devices");
 737         return 0;
 738     }
 739     device_count = 0;
 740     bus_num = addr = speed = class_id = product_id = vendor_id = 0;
 741     ret = 0;
 742     for(;;) {
 743         if (fgets(line, sizeof(line), f) == NULL)
 744             break;
 745         if (strlen(line) > 0)
 746             line[strlen(line) - 1] = '\0';
 747         if (line[0] == 'T' && line[1] == ':') {
 748             if (device_count && (vendor_id || product_id)) {
 749                 /* New device.  Add the previously discovered device.  */
 750                 ret = func(opaque, bus_num, addr, class_id, vendor_id,
 751                            product_id, product_name, speed);
 752                 if (ret)
 753                     goto the_end;
 754             }
 755             if (get_tag_value(buf, sizeof(buf), line, "Bus=", " ") < 0)
 756                 goto fail;
 757             bus_num = atoi(buf);
 758             if (get_tag_value(buf, sizeof(buf), line, "Dev#=", " ") < 0)
 759                 goto fail;
 760             addr = atoi(buf);
 761             if (get_tag_value(buf, sizeof(buf), line, "Spd=", " ") < 0)
 762                 goto fail;
 763             if (!strcmp(buf, "480"))
 764                 speed = USB_SPEED_HIGH;
 765             else if (!strcmp(buf, "1.5"))
 766                 speed = USB_SPEED_LOW;
 767             else
 768                 speed = USB_SPEED_FULL;
 769             product_name[0] = '\0';
 770             class_id = 0xff;
 771             device_count++;
 772             product_id = 0;
 773             vendor_id = 0;
 774         } else if (line[0] == 'P' && line[1] == ':') {
 775             if (get_tag_value(buf, sizeof(buf), line, "Vendor=", " ") < 0)
 776                 goto fail;
 777             vendor_id = strtoul(buf, NULL, 16);
 778             if (get_tag_value(buf, sizeof(buf), line, "ProdID=", " ") < 0)
 779                 goto fail;
 780             product_id = strtoul(buf, NULL, 16);
 781         } else if (line[0] == 'S' && line[1] == ':') {
 782             if (get_tag_value(buf, sizeof(buf), line, "Product=", "") < 0)
 783                 goto fail;
 784             pstrcpy(product_name, sizeof(product_name), buf);
 785         } else if (line[0] == 'D' && line[1] == ':') {
 786             if (get_tag_value(buf, sizeof(buf), line, "Cls=", " (") < 0)
 787                 goto fail;
 788             class_id = strtoul(buf, NULL, 16);
 789         }
 790     fail: ;
 791     }
 792     if (device_count && (vendor_id || product_id)) {
 793         /* Add the last device.  */
 794         ret = func(opaque, bus_num, addr, class_id, vendor_id,
 795                    product_id, product_name, speed);
 796     }
 797  the_end:
 798     fclose(f);
 799     return ret;
 800 }
 801
 802 typedef struct FindDeviceState {
 803     int vendor_id;
 804     int product_id;
 805     int bus_num;
 806     int addr;
 807     char product_name[PRODUCT_NAME_SZ];
 808 } FindDeviceState;
 809
 810 static int usb_host_find_device_scan(void *opaque, int bus_num, int addr,
 811                                      int class_id,
 812                                      int vendor_id, int product_id,
 813                                      const char *product_name, int speed)
 814 {
 815     FindDeviceState *s = opaque;
 816     if ((vendor_id == s->vendor_id &&
 817         product_id == s->product_id) ||
 818         (bus_num == s->bus_num &&
 819         addr == s->addr)) {
 820         pstrcpy(s->product_name, PRODUCT_NAME_SZ, product_name);
 821         s->bus_num = bus_num;
 822         s->addr = addr;
 823         return 1;
 824     } else {
 825         return 0;
 826     }
 827 }
 828
 829 /* the syntax is :
 830    'bus.addr' (decimal numbers) or
 831    'vendor_id:product_id' (hexa numbers) */
 832 static int usb_host_find_device(int *pbus_num, int *paddr,
 833                                 char *product_name, int product_name_size,
 834                                 const char *devname)
 835 {
 836     const char *p;
 837     int ret;
 838     FindDeviceState fs;
 839
 840     p = strchr(devname, '.');
 841     if (p) {
 842         *pbus_num = strtoul(devname, NULL, 0);
 843         *paddr = strtoul(p + 1, NULL, 0);
 844         fs.bus_num = *pbus_num;
 845         fs.addr = *paddr;
 846         ret = usb_host_scan(&fs, usb_host_find_device_scan);
 847         if (ret)
 848             pstrcpy(product_name, product_name_size, fs.product_name);
 849         return 0;
 850     }
 851     p = strchr(devname, ':');
 852     if (p) {
 853         fs.vendor_id = strtoul(devname, NULL, 16);
 854         fs.product_id = strtoul(p + 1, NULL, 16);
 855         ret = usb_host_scan(&fs, usb_host_find_device_scan);
 856         if (ret) {
 857             *pbus_num = fs.bus_num;
 858             *paddr = fs.addr;
 859             pstrcpy(product_name, product_name_size, fs.product_name);
 860             return 0;
 861         }
 862     }
 863     return -1;
 864 }
 865
 866 /**********************/
 867 /* USB host device info */
 868
 869 struct usb_class_info {
 870     int class;
 871     const char *class_name;
 872 };
 873
 874 static const struct usb_class_info usb_class_info[] = {
 875     { USB_CLASS_AUDIO, "Audio"},
 876     { USB_CLASS_COMM, "Communication"},
 877     { USB_CLASS_HID, "HID"},
 878     { USB_CLASS_HUB, "Hub" },
 879     { USB_CLASS_PHYSICAL, "Physical" },
 880     { USB_CLASS_PRINTER, "Printer" },
 881     { USB_CLASS_MASS_STORAGE, "Storage" },
 882     { USB_CLASS_CDC_DATA, "Data" },
 883     { USB_CLASS_APP_SPEC, "Application Specific" },
 884     { USB_CLASS_VENDOR_SPEC, "Vendor Specific" },
 885     { USB_CLASS_STILL_IMAGE, "Still Image" },
 886     { USB_CLASS_CSCID, "Smart Card" },
 887     { USB_CLASS_CONTENT_SEC, "Content Security" },
 888     { -1, NULL }
 889 };
 890
 891 static const char *usb_class_str(uint8_t class)
 892 {
 893     const struct usb_class_info *p;
 894     for(p = usb_class_info; p->class != -1; p++) {
 895         if (p->class == class)
 896             break;
 897     }
 898     return p->class_name;
 899 }
 900
 901 void usb_info_device(int bus_num, int addr, int class_id,
 902                      int vendor_id, int product_id,
 903                      const char *product_name,
 904                      int speed)
 905 {
 906     const char *class_str, *speed_str;
 907
 908     switch(speed) {
 909     case USB_SPEED_LOW:
 910         speed_str = "1.5";
 911         break;
 912     case USB_SPEED_FULL:
 913         speed_str = "12";
 914         break;
 915     case USB_SPEED_HIGH:
 916         speed_str = "480";
 917         break;
 918     default:
 919         speed_str = "?";
 920         break;
 921     }
 922
 923     term_printf("  Device %d.%d, speed %s Mb/s\n",
 924                 bus_num, addr, speed_str);
 925     class_str = usb_class_str(class_id);
 926     if (class_str)
 927         term_printf("    %s:", class_str);
 928     else
 929         term_printf("    Class %02x:", class_id);
 930     term_printf(" USB device %04x:%04x", vendor_id, product_id);
 931     if (product_name[0] != '\0')
 932         term_printf(", %s", product_name);
 933     term_printf("\n");
 934 }
 935
 936 static int usb_host_info_device(void *opaque, int bus_num, int addr,
 937                                 int class_id,
 938                                 int vendor_id, int product_id,
 939                                 const char *product_name,
 940                                 int speed)
 941 {
 942     usb_info_device(bus_num, addr, class_id, vendor_id, product_id,
 943                     product_name, speed);
 944     return 0;
 945 }
 946
 947 void usb_host_info(void)
 948 {
 949     usb_host_scan(NULL, usb_host_info_device);
 950 }
 951
 952 #else
 953
 954 void usb_host_info(void)
 955 {
 956     term_printf("USB host devices not supported\n");
 957 }
 958
 959 /* XXX: modify configure to compile the right host driver */
 960 USBDevice *usb_host_device_open(const char *devname)
 961 {
 962     return NULL;
 963 }
 964
 965 #endif