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 "qemu-common.h"
  25 #include "hw/usb.h"
  26 #include "console.h"
  27
  28 #if defined(__linux__)
  29 #define __user
  30
  31 #include <dirent.h>
  32 #include <sys/ioctl.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/version.h>
  35 #include <signal.h>
  36
  37 /* We redefine it to avoid version problems */
  38 struct usb_ctrltransfer {
  39     uint8_t  bRequestType;
  40     uint8_t  bRequest;
  41     uint16_t wValue;
  42     uint16_t wIndex;
  43     uint16_t wLength;
  44     uint32_t timeout;
  45     void *data;
  46 };
  47
  48 typedef int USBScanFunc(void *opaque, int bus_num, int addr, int class_id,
  49                         int vendor_id, int product_id,
  50                         const char *product_name, int speed);
  51 static int usb_host_find_device(int *pbus_num, int *paddr,
  52                                 char *product_name, int product_name_size,
  53                                 const char *devname);
  54
  55 //#define DEBUG
  56 //#define DEBUG_ISOCH
  57 //#define USE_ASYNCIO
  58
  59 #define USBDEVFS_PATH "/proc/bus/usb"
  60 #define PRODUCT_NAME_SZ 32
  61 #define SIG_ISOCOMPLETE (SIGRTMIN+7)
  62 #define MAX_ENDPOINTS 16
  63
  64 struct sigaction sigact;
  65
  66 /* endpoint association data */
  67 struct endp_data {
  68     uint8_t type;
  69 };
  70
  71 /* FIXME: move USBPacket to PendingURB */
  72 typedef struct USBHostDevice {
  73     USBDevice dev;
  74     int fd;
  75     int pipe_fds[2];
  76     USBPacket *packet;
  77     struct endp_data endp_table[MAX_ENDPOINTS];
  78     int configuration;
  79     uint8_t descr[1024];
  80     int descr_len;
  81     int urbs_ready;
  82 } USBHostDevice;
  83
  84 typedef struct PendingURB {
  85     struct usbdevfs_urb *urb;
  86     int status;
  87     struct PendingURB *next;
  88 } PendingURB;
  89
  90 static PendingURB *pending_urbs = NULL;
  91
  92 static int add_pending_urb(struct usbdevfs_urb *urb)
  93 {
  94     PendingURB *purb = qemu_mallocz(sizeof(PendingURB));
  95     if (purb) {
  96         purb->urb = urb;
  97         purb->status = 0;
  98         purb->next = pending_urbs;
  99         pending_urbs = purb;
 100         return 1;
 101     }
 102     return 0;
 103 }
 104
 105 static int del_pending_urb(struct usbdevfs_urb *urb)
 106 {
 107     PendingURB *purb = pending_urbs;
 108     PendingURB *prev = NULL;
 109
 110     while (purb && purb->urb != urb) {
 111         prev = purb;
 112         purb = purb->next;
 113     }
 114
 115     if (purb && purb->urb == urb) {
 116         if (prev) {
 117             prev->next = purb->next;
 118         } else {
 119             pending_urbs = purb->next;
 120         }
 121         qemu_free(purb);
 122         return 1;
 123     }
 124     return 0;
 125 }
 126
 127 #ifdef USE_ASYNCIO
 128 static PendingURB *get_pending_urb(struct usbdevfs_urb *urb)
 129 {
 130     PendingURB *purb = pending_urbs;
 131
 132     while (purb && purb->urb != urb) {
 133         purb = purb->next;
 134     }
 135
 136     if (purb && purb->urb == urb) {
 137         return purb;
 138     }
 139     return NULL;
 140 }
 141 #endif
 142
 143 static int usb_host_update_interfaces(USBHostDevice *dev, int configuration)
 144 {
 145     int dev_descr_len, config_descr_len;
 146     int interface, nb_interfaces, nb_configurations;
 147     int ret, i;
 148
 149     if (configuration == 0) /* address state - ignore */
 150         return 1;
 151
 152     i = 0;
 153     dev_descr_len = dev->descr[0];
 154     if (dev_descr_len > dev->descr_len)
 155         goto fail;
 156     nb_configurations = dev->descr[17];
 157
 158     i += dev_descr_len;
 159     while (i < dev->descr_len) {
 160 #ifdef DEBUG
 161         printf("i is %d, descr_len is %d, dl %d, dt %d\n", i, dev->descr_len,
 162                dev->descr[i], dev->descr[i+1]);
 163 #endif
 164         if (dev->descr[i+1] != USB_DT_CONFIG) {
 165             i += dev->descr[i];
 166             continue;
 167         }
 168         config_descr_len = dev->descr[i];
 169
 170         if (configuration == dev->descr[i + 5])
 171             break;
 172
 173         i += config_descr_len;
 174     }
 175
 176     if (i >= dev->descr_len) {
 177         printf("usb_host: error - device has no matching configuration\n");
 178         goto fail;
 179     }
 180     nb_interfaces = dev->descr[i + 4];
 181
 182 #ifdef USBDEVFS_DISCONNECT
 183     /* earlier Linux 2.4 do not support that */
 184     {
 185         struct usbdevfs_ioctl ctrl;
 186         for (interface = 0; interface < nb_interfaces; interface++) {
 187             ctrl.ioctl_code = USBDEVFS_DISCONNECT;
 188             ctrl.ifno = interface;
 189             ret = ioctl(dev->fd, USBDEVFS_IOCTL, &ctrl);
 190             if (ret < 0 && errno != ENODATA) {
 191                 perror("USBDEVFS_DISCONNECT");
 192                 goto fail;
 193             }
 194         }
 195     }
 196 #endif
 197
 198     /* XXX: only grab if all interfaces are free */
 199     for (interface = 0; interface < nb_interfaces; interface++) {
 200         ret = ioctl(dev->fd, USBDEVFS_CLAIMINTERFACE, &interface);
 201         if (ret < 0) {
 202             if (errno == EBUSY) {
 203                 fprintf(stderr,
 204                         "usb_host: warning - device already grabbed\n");
 205             } else {
 206                 perror("USBDEVFS_CLAIMINTERFACE");
 207             }
 208         fail:
 209             return 0;
 210         }
 211     }
 212
 213 #ifdef DEBUG
 214     printf("usb_host: %d interfaces claimed for configuration %d\n",
 215            nb_interfaces, configuration);
 216 #endif
 217
 218     return 1;
 219 }
 220
 221 static void usb_host_handle_reset(USBDevice *dev)
 222 {
 223 #if 0
 224     USBHostDevice *s = (USBHostDevice *)dev;
 225     /* USBDEVFS_RESET, but not the first time as it has already be
 226        done by the host OS */
 227     ioctl(s->fd, USBDEVFS_RESET);
 228 #endif
 229 }
 230
 231 static void usb_host_handle_destroy(USBDevice *dev)
 232 {
 233     USBHostDevice *s = (USBHostDevice *)dev;
 234
 235     if (s->fd >= 0)
 236         close(s->fd);
 237     qemu_free(s);
 238 }
 239
 240 static int usb_linux_update_endp_table(USBHostDevice *s);
 241
 242 static int usb_host_handle_control(USBDevice *dev,
 243                                    int request,
 244                                    int value,
 245                                    int index,
 246                                    int length,
 247                                    uint8_t *data)
 248 {
 249     USBHostDevice *s = (USBHostDevice *)dev;
 250     struct usb_ctrltransfer ct;
 251     struct usbdevfs_setinterface si;
 252     int intf_update_required = 0;
 253     int ret;
 254
 255     if (request == (DeviceOutRequest | USB_REQ_SET_ADDRESS)) {
 256         /* specific SET_ADDRESS support */
 257         dev->addr = value;
 258         return 0;
 259     } else if (request == ((USB_RECIP_INTERFACE << 8) |
 260                            USB_REQ_SET_INTERFACE)) {
 261         /* set alternate setting for the interface */
 262         si.interface = index;
 263         si.altsetting = value;
 264         ret = ioctl(s->fd, USBDEVFS_SETINTERFACE, &si);
 265         usb_linux_update_endp_table(s);
 266     } else if (request == (DeviceOutRequest | USB_REQ_SET_CONFIGURATION)) {
 267 #ifdef DEBUG
 268         printf("usb_host_handle_control: SET_CONFIGURATION request - "
 269                "config %d\n", value & 0xff);
 270 #endif
 271         if (s->configuration != (value & 0xff)) {
 272             s->configuration = (value & 0xff);
 273             intf_update_required = 1;
 274         }
 275         goto do_request;
 276     } else {
 277     do_request:
 278         ct.bRequestType = request >> 8;
 279         ct.bRequest = request;
 280         ct.wValue = value;
 281         ct.wIndex = index;
 282         ct.wLength = length;
 283         ct.timeout = 50;
 284         ct.data = data;
 285         ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 286     }
 287
 288     if (ret < 0) {
 289         switch(errno) {
 290         case ETIMEDOUT:
 291             return USB_RET_NAK;
 292         default:
 293             return USB_RET_STALL;
 294         }
 295     } else {
 296         if (intf_update_required) {
 297 #ifdef DEBUG
 298             printf("usb_host_handle_control: updating interfaces\n");
 299 #endif
 300             usb_host_update_interfaces(s, value & 0xff);
 301         }
 302         return ret;
 303     }
 304 }
 305
 306 static int usb_host_handle_isoch(USBDevice *dev, USBPacket *p);
 307
 308 static int usb_host_handle_data(USBDevice *dev, USBPacket *p)
 309 {
 310     USBHostDevice *s = (USBHostDevice *)dev;
 311     struct usbdevfs_bulktransfer bt;
 312     int ret;
 313     uint8_t devep = p->devep;
 314
 315     if (s->endp_table[p->devep - 1].type == USBDEVFS_URB_TYPE_ISO) {
 316         return usb_host_handle_isoch(dev, p);
 317     }
 318
 319     /* XXX: optimize and handle all data types by looking at the
 320        config descriptor */
 321     if (p->pid == USB_TOKEN_IN)
 322         devep |= 0x80;
 323     bt.ep = devep;
 324     bt.len = p->len;
 325     bt.timeout = 50;
 326     bt.data = p->data;
 327     ret = ioctl(s->fd, USBDEVFS_BULK, &bt);
 328     if (ret < 0) {
 329         switch(errno) {
 330         case ETIMEDOUT:
 331             return USB_RET_NAK;
 332         case EPIPE:
 333         default:
 334 #ifdef DEBUG
 335             printf("handle_data: errno=%d\n", errno);
 336 #endif
 337             return USB_RET_STALL;
 338         }
 339     } else {
 340         return ret;
 341     }
 342 }
 343
 344 #ifdef USE_ASYNCIO
 345 static void urb_completion_pipe_read(void *opaque)
 346 {
 347     USBHostDevice *s = opaque;
 348     USBPacket *p = s->packet;
 349     PendingURB *pending_urb = NULL;
 350     struct usbdevfs_urb *purb = NULL;
 351     int len, ret;
 352
 353     len = read(s->pipe_fds[0], &pending_urb, sizeof(pending_urb));
 354     if (len != sizeof(pending_urb)) {
 355         printf("urb_completion: error reading pending_urb, len=%d\n", len);
 356         return;
 357     }
 358
 359     /* FIXME: handle pending_urb->status */
 360     del_pending_urb(pending_urb->urb);
 361
 362     if (!p) {
 363         s->urbs_ready++;
 364         return;
 365     }
 366
 367     ret = ioctl(s->fd, USBDEVFS_REAPURBNDELAY, &purb);
 368     if (ret < 0) {
 369         printf("urb_completion: REAPURBNDELAY ioctl=%d errno=%d\n",
 370                ret, errno);
 371         return;
 372     }
 373
 374 #ifdef DEBUG_ISOCH
 375     if (purb == pending_urb->urb) {
 376         printf("urb_completion: urb mismatch reaped=%p pending=%p\n",
 377                purb, urb);
 378     }
 379 #endif
 380
 381     p->len = purb->actual_length;
 382     usb_packet_complete(p);
 383     qemu_free(purb);
 384     s->packet = NULL;
 385 }
 386
 387 static void isoch_done(int signum, siginfo_t *info, void *context)
 388 {
 389     struct usbdevfs_urb *urb = (struct usbdevfs_urb *)info->si_addr;
 390     USBHostDevice *s = (USBHostDevice *)urb->usercontext;
 391     PendingURB *purb;
 392
 393     if (info->si_code != SI_ASYNCIO ||
 394         info->si_signo != SIG_ISOCOMPLETE) {
 395         return;
 396     }
 397
 398     purb = get_pending_urb(urb);
 399     if (purb) {
 400         purb->status = info->si_errno;
 401         write(s->pipe_fds[1], &purb, sizeof(purb));
 402     }
 403 }
 404 #endif
 405
 406 static int usb_host_handle_isoch(USBDevice *dev, USBPacket *p)
 407 {
 408     USBHostDevice *s = (USBHostDevice *)dev;
 409     struct usbdevfs_urb *urb, *purb = NULL;
 410     int ret;
 411     uint8_t devep = p->devep;
 412
 413     if (p->pid == USB_TOKEN_IN)
 414         devep |= 0x80;
 415
 416     urb = qemu_mallocz(sizeof(struct usbdevfs_urb) +
 417                        sizeof(struct usbdevfs_iso_packet_desc));
 418     if (!urb) {
 419         printf("usb_host_handle_isoch: malloc failed\n");
 420         return 0;
 421     }
 422
 423     urb->type = USBDEVFS_URB_TYPE_ISO;
 424     urb->endpoint = devep;
 425     urb->status = 0;
 426     urb->flags = USBDEVFS_URB_ISO_ASAP;
 427     urb->buffer = p->data;
 428     urb->buffer_length = p->len;
 429     urb->actual_length = 0;
 430     urb->start_frame = 0;
 431     urb->error_count = 0;
 432 #ifdef USE_ASYNCIO
 433     urb->signr = SIG_ISOCOMPLETE;
 434 #else
 435     urb->signr = 0;
 436 #endif
 437     urb->usercontext = s;
 438     urb->number_of_packets = 1;
 439     urb->iso_frame_desc[0].length = p->len;
 440     urb->iso_frame_desc[0].actual_length = 0;
 441     urb->iso_frame_desc[0].status = 0;
 442     ret = ioctl(s->fd, USBDEVFS_SUBMITURB, urb);
 443     if (ret == 0) {
 444         if (!add_pending_urb(urb)) {
 445             printf("usb_host_handle_isoch: add_pending_urb failed %p\n", urb);
 446         }
 447     } else {
 448         printf("usb_host_handle_isoch: SUBMITURB ioctl=%d errno=%d\n",
 449                ret, errno);
 450         qemu_free(urb);
 451         switch(errno) {
 452         case ETIMEDOUT:
 453             return USB_RET_NAK;
 454         case EPIPE:
 455         default:
 456             return USB_RET_STALL;
 457         }
 458     }
 459 #ifdef USE_ASYNCIO
 460     /* FIXME: handle urbs_ready together with sync io
 461      * workaround for injecting the signaled urbs into current frame */
 462     if (s->urbs_ready > 0) {
 463         ret = ioctl(s->fd, USBDEVFS_REAPURBNDELAY, &purb);
 464         if (ret == 0) {
 465             ret = purb->actual_length;
 466             qemu_free(purb);
 467             s->urbs_ready--;
 468         }
 469         return ret;
 470     }
 471     s->packet = p;
 472     return USB_RET_ASYNC;
 473 #else
 474     ret = ioctl(s->fd, USBDEVFS_REAPURBNDELAY, &purb);
 475     if (ret == 0) {
 476         if (del_pending_urb(purb)) {
 477             ret = purb->actual_length;
 478             qemu_free(purb);
 479         } else {
 480             printf("usb_host_handle_isoch: del_pending_urb failed %p\n", purb);
 481         }
 482     } else {
 483 #ifdef DEBUG_ISOCH
 484         printf("usb_host_handle_isoch: REAPURBNDELAY ioctl=%d errno=%d\n",
 485                ret, errno);
 486 #endif
 487     }
 488     return ret;
 489 #endif
 490 }
 491
 492 /* returns 1 on problem encountered or 0 for success */
 493 static int usb_linux_update_endp_table(USBHostDevice *s)
 494 {
 495     uint8_t *descriptors;
 496     uint8_t devep, type, configuration, alt_interface;
 497     struct usb_ctrltransfer ct;
 498     int interface, ret, length, i;
 499
 500     ct.bRequestType = USB_DIR_IN;
 501     ct.bRequest = USB_REQ_GET_CONFIGURATION;
 502     ct.wValue = 0;
 503     ct.wIndex = 0;
 504     ct.wLength = 1;
 505     ct.data = &configuration;
 506     ct.timeout = 50;
 507
 508     ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 509     if (ret < 0) {
 510         perror("usb_linux_update_endp_table");
 511         return 1;
 512     }
 513
 514     /* in address state */
 515     if (configuration == 0)
 516         return 1;
 517
 518     /* get the desired configuration, interface, and endpoint descriptors
 519      * from device description */
 520     descriptors = &s->descr[18];
 521     length = s->descr_len - 18;
 522     i = 0;
 523
 524     if (descriptors[i + 1] != USB_DT_CONFIG ||
 525         descriptors[i + 5] != configuration) {
 526         printf("invalid descriptor data - configuration\n");
 527         return 1;
 528     }
 529     i += descriptors[i];
 530
 531     while (i < length) {
 532         if (descriptors[i + 1] != USB_DT_INTERFACE ||
 533             (descriptors[i + 1] == USB_DT_INTERFACE &&
 534              descriptors[i + 4] == 0)) {
 535             i += descriptors[i];
 536             continue;
 537         }
 538
 539         interface = descriptors[i + 2];
 540
 541         ct.bRequestType = USB_DIR_IN | USB_RECIP_INTERFACE;
 542         ct.bRequest = USB_REQ_GET_INTERFACE;
 543         ct.wValue = 0;
 544         ct.wIndex = interface;
 545         ct.wLength = 1;
 546         ct.data = &alt_interface;
 547         ct.timeout = 50;
 548
 549         ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 550         if (ret < 0) {
 551             perror("usb_linux_update_endp_table");
 552             return 1;
 553         }
 554
 555         /* the current interface descriptor is the active interface
 556          * and has endpoints */
 557         if (descriptors[i + 3] != alt_interface) {
 558             i += descriptors[i];
 559             continue;
 560         }
 561
 562         /* advance to the endpoints */
 563         while (i < length && descriptors[i +1] != USB_DT_ENDPOINT)
 564             i += descriptors[i];
 565
 566         if (i >= length)
 567             break;
 568
 569         while (i < length) {
 570             if (descriptors[i + 1] != USB_DT_ENDPOINT)
 571                 break;
 572
 573             devep = descriptors[i + 2];
 574             switch (descriptors[i + 3] & 0x3) {
 575             case 0x00:
 576                 type = USBDEVFS_URB_TYPE_CONTROL;
 577                 break;
 578             case 0x01:
 579                 type = USBDEVFS_URB_TYPE_ISO;
 580                 break;
 581             case 0x02:
 582                 type = USBDEVFS_URB_TYPE_BULK;
 583                 break;
 584             case 0x03:
 585                 type = USBDEVFS_URB_TYPE_INTERRUPT;
 586                 break;
 587             default:
 588                 printf("usb_host: malformed endpoint type\n");
 589                 type = USBDEVFS_URB_TYPE_BULK;
 590             }
 591             s->endp_table[(devep & 0xf) - 1].type = type;
 592
 593             i += descriptors[i];
 594         }
 595     }
 596     return 0;
 597 }
 598
 599 /* XXX: exclude high speed devices or implement EHCI */
 600 USBDevice *usb_host_device_open(const char *devname)
 601 {
 602     int fd = -1, ret;
 603     USBHostDevice *dev = NULL;
 604     struct usbdevfs_connectinfo ci;
 605     char buf[1024];
 606     int bus_num, addr;
 607     char product_name[PRODUCT_NAME_SZ];
 608
 609     dev = qemu_mallocz(sizeof(USBHostDevice));
 610     if (!dev)
 611         goto fail;
 612
 613 #ifdef DEBUG_ISOCH
 614     printf("usb_host_device_open %s\n", devname);
 615 #endif
 616     if (usb_host_find_device(&bus_num, &addr,
 617                              product_name, sizeof(product_name),
 618                              devname) < 0)
 619         return NULL;
 620
 621     snprintf(buf, sizeof(buf), USBDEVFS_PATH "/%03d/%03d",
 622              bus_num, addr);
 623     fd = open(buf, O_RDWR | O_NONBLOCK);
 624     if (fd < 0) {
 625         perror(buf);
 626         return NULL;
 627     }
 628
 629     /* read the device description */
 630     dev->descr_len = read(fd, dev->descr, sizeof(dev->descr));
 631     if (dev->descr_len <= 0) {
 632         perror("usb_host_device_open: reading device data failed");
 633         goto fail;
 634     }
 635
 636 #ifdef DEBUG
 637     {
 638         int x;
 639         printf("=== begin dumping device descriptor data ===\n");
 640         for (x = 0; x < dev->descr_len; x++)
 641             printf("%02x ", dev->descr[x]);
 642         printf("\n=== end dumping device descriptor data ===\n");
 643     }
 644 #endif
 645
 646     dev->fd = fd;
 647     dev->configuration = 1;
 648
 649     /* XXX - do something about initial configuration */
 650     if (!usb_host_update_interfaces(dev, 1))
 651         goto fail;
 652
 653     ret = ioctl(fd, USBDEVFS_CONNECTINFO, &ci);
 654     if (ret < 0) {
 655         perror("usb_host_device_open: USBDEVFS_CONNECTINFO");
 656         goto fail;
 657     }
 658
 659 #ifdef DEBUG
 660     printf("host USB device %d.%d grabbed\n", bus_num, addr);
 661 #endif
 662
 663     ret = usb_linux_update_endp_table(dev);
 664     if (ret)
 665         goto fail;
 666
 667     if (ci.slow)
 668         dev->dev.speed = USB_SPEED_LOW;
 669     else
 670         dev->dev.speed = USB_SPEED_HIGH;
 671     dev->dev.handle_packet = usb_generic_handle_packet;
 672
 673     dev->dev.handle_reset = usb_host_handle_reset;
 674     dev->dev.handle_control = usb_host_handle_control;
 675     dev->dev.handle_data = usb_host_handle_data;
 676     dev->dev.handle_destroy = usb_host_handle_destroy;
 677
 678     if (product_name[0] == '\0')
 679         snprintf(dev->dev.devname, sizeof(dev->dev.devname),
 680                  "host:%s", devname);
 681     else
 682         pstrcpy(dev->dev.devname, sizeof(dev->dev.devname),
 683                 product_name);
 684
 685 #ifdef USE_ASYNCIO
 686     /* set up the signal handlers */
 687     sigemptyset(&sigact.sa_mask);
 688     sigact.sa_sigaction = isoch_done;
 689     sigact.sa_flags = SA_SIGINFO;
 690     sigact.sa_restorer = 0;
 691     ret = sigaction(SIG_ISOCOMPLETE, &sigact, NULL);
 692     if (ret < 0) {
 693         perror("usb_host_device_open: sigaction failed");
 694         goto fail;
 695     }
 696
 697     if (pipe(dev->pipe_fds) < 0) {
 698         perror("usb_host_device_open: pipe creation failed");
 699         goto fail;
 700     }
 701     fcntl(dev->pipe_fds[0], F_SETFL, O_NONBLOCK | O_ASYNC);
 702     fcntl(dev->pipe_fds[1], F_SETFL, O_NONBLOCK);
 703     qemu_set_fd_handler(dev->pipe_fds[0], urb_completion_pipe_read, NULL, dev);
 704 #endif
 705     dev->urbs_ready = 0;
 706     return (USBDevice *)dev;
 707 fail:
 708     if (dev)
 709         qemu_free(dev);
 710     close(fd);
 711     return NULL;
 712 }
 713
 714 static int get_tag_value(char *buf, int buf_size,
 715                          const char *str, const char *tag,
 716                          const char *stopchars)
 717 {
 718     const char *p;
 719     char *q;
 720     p = strstr(str, tag);
 721     if (!p)
 722         return -1;
 723     p += strlen(tag);
 724     while (isspace(*p))
 725         p++;
 726     q = buf;
 727     while (*p != '\0' && !strchr(stopchars, *p)) {
 728         if ((q - buf) < (buf_size - 1))
 729             *q++ = *p;
 730         p++;
 731     }
 732     *q = '\0';
 733     return q - buf;
 734 }
 735
 736 static int usb_host_scan(void *opaque, USBScanFunc *func)
 737 {
 738     FILE *f;
 739     char line[1024];
 740     char buf[1024];
 741     int bus_num, addr, speed, device_count, class_id, product_id, vendor_id;
 742     int ret;
 743     char product_name[512];
 744
 745     f = fopen(USBDEVFS_PATH "/devices", "r");
 746     if (!f) {
 747         term_printf("Could not open %s\n", USBDEVFS_PATH "/devices");
 748         return 0;
 749     }
 750     device_count = 0;
 751     bus_num = addr = speed = class_id = product_id = vendor_id = 0;
 752     ret = 0;
 753     for(;;) {
 754         if (fgets(line, sizeof(line), f) == NULL)
 755             break;
 756         if (strlen(line) > 0)
 757             line[strlen(line) - 1] = '\0';
 758         if (line[0] == 'T' && line[1] == ':') {
 759             if (device_count && (vendor_id || product_id)) {
 760                 /* New device.  Add the previously discovered device.  */
 761                 ret = func(opaque, bus_num, addr, class_id, vendor_id,
 762                            product_id, product_name, speed);
 763                 if (ret)
 764                     goto the_end;
 765             }
 766             if (get_tag_value(buf, sizeof(buf), line, "Bus=", " ") < 0)
 767                 goto fail;
 768             bus_num = atoi(buf);
 769             if (get_tag_value(buf, sizeof(buf), line, "Dev#=", " ") < 0)
 770                 goto fail;
 771             addr = atoi(buf);
 772             if (get_tag_value(buf, sizeof(buf), line, "Spd=", " ") < 0)
 773                 goto fail;
 774             if (!strcmp(buf, "480"))
 775                 speed = USB_SPEED_HIGH;
 776             else if (!strcmp(buf, "1.5"))
 777                 speed = USB_SPEED_LOW;
 778             else
 779                 speed = USB_SPEED_FULL;
 780             product_name[0] = '\0';
 781             class_id = 0xff;
 782             device_count++;
 783             product_id = 0;
 784             vendor_id = 0;
 785         } else if (line[0] == 'P' && line[1] == ':') {
 786             if (get_tag_value(buf, sizeof(buf), line, "Vendor=", " ") < 0)
 787                 goto fail;
 788             vendor_id = strtoul(buf, NULL, 16);
 789             if (get_tag_value(buf, sizeof(buf), line, "ProdID=", " ") < 0)
 790                 goto fail;
 791             product_id = strtoul(buf, NULL, 16);
 792         } else if (line[0] == 'S' && line[1] == ':') {
 793             if (get_tag_value(buf, sizeof(buf), line, "Product=", "") < 0)
 794                 goto fail;
 795             pstrcpy(product_name, sizeof(product_name), buf);
 796         } else if (line[0] == 'D' && line[1] == ':') {
 797             if (get_tag_value(buf, sizeof(buf), line, "Cls=", " (") < 0)
 798                 goto fail;
 799             class_id = strtoul(buf, NULL, 16);
 800         }
 801     fail: ;
 802     }
 803     if (device_count && (vendor_id || product_id)) {
 804         /* Add the last device.  */
 805         ret = func(opaque, bus_num, addr, class_id, vendor_id,
 806                    product_id, product_name, speed);
 807     }
 808  the_end:
 809     fclose(f);
 810     return ret;
 811 }
 812
 813 typedef struct FindDeviceState {
 814     int vendor_id;
 815     int product_id;
 816     int bus_num;
 817     int addr;
 818     char product_name[PRODUCT_NAME_SZ];
 819 } FindDeviceState;
 820
 821 static int usb_host_find_device_scan(void *opaque, int bus_num, int addr,
 822                                      int class_id,
 823                                      int vendor_id, int product_id,
 824                                      const char *product_name, int speed)
 825 {
 826     FindDeviceState *s = opaque;
 827     if ((vendor_id == s->vendor_id &&
 828         product_id == s->product_id) ||
 829         (bus_num == s->bus_num &&
 830         addr == s->addr)) {
 831         pstrcpy(s->product_name, PRODUCT_NAME_SZ, product_name);
 832         s->bus_num = bus_num;
 833         s->addr = addr;
 834         return 1;
 835     } else {
 836         return 0;
 837     }
 838 }
 839
 840 /* the syntax is :
 841    'bus.addr' (decimal numbers) or
 842    'vendor_id:product_id' (hexa numbers) */
 843 static int usb_host_find_device(int *pbus_num, int *paddr,
 844                                 char *product_name, int product_name_size,
 845                                 const char *devname)
 846 {
 847     const char *p;
 848     int ret;
 849     FindDeviceState fs;
 850
 851     p = strchr(devname, '.');
 852     if (p) {
 853         *pbus_num = strtoul(devname, NULL, 0);
 854         *paddr = strtoul(p + 1, NULL, 0);
 855         fs.bus_num = *pbus_num;
 856         fs.addr = *paddr;
 857         ret = usb_host_scan(&fs, usb_host_find_device_scan);
 858         if (ret)
 859             pstrcpy(product_name, product_name_size, fs.product_name);
 860         return 0;
 861     }
 862     p = strchr(devname, ':');
 863     if (p) {
 864         fs.vendor_id = strtoul(devname, NULL, 16);
 865         fs.product_id = strtoul(p + 1, NULL, 16);
 866         ret = usb_host_scan(&fs, usb_host_find_device_scan);
 867         if (ret) {
 868             *pbus_num = fs.bus_num;
 869             *paddr = fs.addr;
 870             pstrcpy(product_name, product_name_size, fs.product_name);
 871             return 0;
 872         }
 873     }
 874     return -1;
 875 }
 876
 877 /**********************/
 878 /* USB host device info */
 879
 880 struct usb_class_info {
 881     int class;
 882     const char *class_name;
 883 };
 884
 885 static const struct usb_class_info usb_class_info[] = {
 886     { USB_CLASS_AUDIO, "Audio"},
 887     { USB_CLASS_COMM, "Communication"},
 888     { USB_CLASS_HID, "HID"},
 889     { USB_CLASS_HUB, "Hub" },
 890     { USB_CLASS_PHYSICAL, "Physical" },
 891     { USB_CLASS_PRINTER, "Printer" },
 892     { USB_CLASS_MASS_STORAGE, "Storage" },
 893     { USB_CLASS_CDC_DATA, "Data" },
 894     { USB_CLASS_APP_SPEC, "Application Specific" },
 895     { USB_CLASS_VENDOR_SPEC, "Vendor Specific" },
 896     { USB_CLASS_STILL_IMAGE, "Still Image" },
 897     { USB_CLASS_CSCID, "Smart Card" },
 898     { USB_CLASS_CONTENT_SEC, "Content Security" },
 899     { -1, NULL }
 900 };
 901
 902 static const char *usb_class_str(uint8_t class)
 903 {
 904     const struct usb_class_info *p;
 905     for(p = usb_class_info; p->class != -1; p++) {
 906         if (p->class == class)
 907             break;
 908     }
 909     return p->class_name;
 910 }
 911
 912 static void usb_info_device(int bus_num, int addr, int class_id,
 913                             int vendor_id, int product_id,
 914                             const char *product_name,
 915                             int speed)
 916 {
 917     const char *class_str, *speed_str;
 918
 919     switch(speed) {
 920     case USB_SPEED_LOW:
 921         speed_str = "1.5";
 922         break;
 923     case USB_SPEED_FULL:
 924         speed_str = "12";
 925         break;
 926     case USB_SPEED_HIGH:
 927         speed_str = "480";
 928         break;
 929     default:
 930         speed_str = "?";
 931         break;
 932     }
 933
 934     term_printf("  Device %d.%d, speed %s Mb/s\n",
 935                 bus_num, addr, speed_str);
 936     class_str = usb_class_str(class_id);
 937     if (class_str)
 938         term_printf("    %s:", class_str);
 939     else
 940         term_printf("    Class %02x:", class_id);
 941     term_printf(" USB device %04x:%04x", vendor_id, product_id);
 942     if (product_name[0] != '\0')
 943         term_printf(", %s", product_name);
 944     term_printf("\n");
 945 }
 946
 947 static int usb_host_info_device(void *opaque, int bus_num, int addr,
 948                                 int class_id,
 949                                 int vendor_id, int product_id,
 950                                 const char *product_name,
 951                                 int speed)
 952 {
 953     usb_info_device(bus_num, addr, class_id, vendor_id, product_id,
 954                     product_name, speed);
 955     return 0;
 956 }
 957
 958 void usb_host_info(void)
 959 {
 960     usb_host_scan(NULL, usb_host_info_device);
 961 }
 962
 963 #else
 964
 965 void usb_host_info(void)
 966 {
 967     term_printf("USB host devices not supported\n");
 968 }
 969
 970 /* XXX: modify configure to compile the right host driver */
 971 USBDevice *usb_host_device_open(const char *devname)
 972 {
 973     return NULL;
 974 }
 975
 976 #endif