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 #include <dirent.h>
  30 #include <sys/ioctl.h>
  31 #include <linux/usbdevice_fs.h>
  32 #include <linux/version.h>
  33 #include <signal.h>
  34
  35 /* We redefine it to avoid version problems */
  36 struct usb_ctrltransfer {
  37     uint8_t  bRequestType;
  38     uint8_t  bRequest;
  39     uint16_t wValue;
  40     uint16_t wIndex;
  41     uint16_t wLength;
  42     uint32_t timeout;
  43     void *data;
  44 };
  45
  46 typedef int USBScanFunc(void *opaque, int bus_num, int addr, int class_id,
  47                         int vendor_id, int product_id,
  48                         const char *product_name, int speed);
  49 static int usb_host_find_device(int *pbus_num, int *paddr,
  50                                 char *product_name, int product_name_size,
  51                                 const char *devname);
  52
  53 //#define DEBUG
  54 //#define DEBUG_ISOCH
  55 //#define USE_ASYNCIO
  56
  57 #define USBDEVFS_PATH "/proc/bus/usb"
  58 #define PRODUCT_NAME_SZ 32
  59 #define SIG_ISOCOMPLETE (SIGRTMIN+7)
  60 #define MAX_ENDPOINTS 16
  61
  62 struct sigaction sigact;
  63
  64 /* endpoint association data */
  65 struct endp_data {
  66     uint8_t type;
  67 };
  68
  69 /* FIXME: move USBPacket to PendingURB */
  70 typedef struct USBHostDevice {
  71     USBDevice dev;
  72     int fd;
  73     int pipe_fds[2];
  74     USBPacket *packet;
  75     struct endp_data endp_table[MAX_ENDPOINTS];
  76     int configuration;
  77     uint8_t descr[1024];
  78     int descr_len;
  79     int urbs_ready;
  80 } USBHostDevice;
  81
  82 typedef struct PendingURB {
  83     struct usbdevfs_urb *urb;
  84     int status;
  85     struct PendingURB *next;
  86 } PendingURB;
  87
  88 static PendingURB *pending_urbs = NULL;
  89
  90 static int add_pending_urb(struct usbdevfs_urb *urb)
  91 {
  92     PendingURB *purb = qemu_mallocz(sizeof(PendingURB));
  93     if (purb) {
  94         purb->urb = urb;
  95         purb->status = 0;
  96         purb->next = pending_urbs;
  97         pending_urbs = purb;
  98         return 1;
  99     }
 100     return 0;
 101 }
 102
 103 static int del_pending_urb(struct usbdevfs_urb *urb)
 104 {
 105     PendingURB *purb = pending_urbs;
 106     PendingURB *prev = NULL;
 107
 108     while (purb && purb->urb != urb) {
 109         prev = purb;
 110         purb = purb->next;
 111     }
 112
 113     if (purb && purb->urb == urb) {
 114         if (prev) {
 115             prev->next = purb->next;
 116         } else {
 117             pending_urbs = purb->next;
 118         }
 119         qemu_free(purb);
 120         return 1;
 121     }
 122     return 0;
 123 }
 124
 125 #ifdef USE_ASYNCIO
 126 static PendingURB *get_pending_urb(struct usbdevfs_urb *urb)
 127 {
 128     PendingURB *purb = pending_urbs;
 129
 130     while (purb && purb->urb != urb) {
 131         purb = purb->next;
 132     }
 133
 134     if (purb && purb->urb == urb) {
 135         return purb;
 136     }
 137     return NULL;
 138 }
 139 #endif
 140
 141 static int usb_host_update_interfaces(USBHostDevice *dev, int configuration)
 142 {
 143     int dev_descr_len, config_descr_len;
 144     int interface, nb_interfaces, nb_configurations;
 145     int ret, i;
 146
 147     if (configuration == 0) /* address state - ignore */
 148         return 1;
 149
 150     i = 0;
 151     dev_descr_len = dev->descr[0];
 152     if (dev_descr_len > dev->descr_len)
 153         goto fail;
 154     nb_configurations = dev->descr[17];
 155
 156     i += dev_descr_len;
 157     while (i < dev->descr_len) {
 158 #ifdef DEBUG
 159         printf("i is %d, descr_len is %d, dl %d, dt %d\n", i, dev->descr_len,
 160                dev->descr[i], dev->descr[i+1]);
 161 #endif
 162         if (dev->descr[i+1] != USB_DT_CONFIG) {
 163             i += dev->descr[i];
 164             continue;
 165         }
 166         config_descr_len = dev->descr[i];
 167
 168         if (configuration == dev->descr[i + 5])
 169             break;
 170
 171         i += config_descr_len;
 172     }
 173
 174     if (i >= dev->descr_len) {
 175         printf("usb_host: error - device has no matching configuration\n");
 176         goto fail;
 177     }
 178     nb_interfaces = dev->descr[i + 4];
 179
 180 #ifdef USBDEVFS_DISCONNECT
 181     /* earlier Linux 2.4 do not support that */
 182     {
 183         struct usbdevfs_ioctl ctrl;
 184         for (interface = 0; interface < nb_interfaces; interface++) {
 185             ctrl.ioctl_code = USBDEVFS_DISCONNECT;
 186             ctrl.ifno = interface;
 187             ret = ioctl(dev->fd, USBDEVFS_IOCTL, &ctrl);
 188             if (ret < 0 && errno != ENODATA) {
 189                 perror("USBDEVFS_DISCONNECT");
 190                 goto fail;
 191             }
 192         }
 193     }
 194 #endif
 195
 196     /* XXX: only grab if all interfaces are free */
 197     for (interface = 0; interface < nb_interfaces; interface++) {
 198         ret = ioctl(dev->fd, USBDEVFS_CLAIMINTERFACE, &interface);
 199         if (ret < 0) {
 200             if (errno == EBUSY) {
 201                 fprintf(stderr,
 202                         "usb_host: warning - device already grabbed\n");
 203             } else {
 204                 perror("USBDEVFS_CLAIMINTERFACE");
 205             }
 206         fail:
 207             return 0;
 208         }
 209     }
 210
 211 #ifdef DEBUG
 212     printf("usb_host: %d interfaces claimed for configuration %d\n",
 213            nb_interfaces, configuration);
 214 #endif
 215
 216     return 1;
 217 }
 218
 219 static void usb_host_handle_reset(USBDevice *dev)
 220 {
 221 #if 0
 222     USBHostDevice *s = (USBHostDevice *)dev;
 223     /* USBDEVFS_RESET, but not the first time as it has already be
 224        done by the host OS */
 225     ioctl(s->fd, USBDEVFS_RESET);
 226 #endif
 227 }
 228
 229 static void usb_host_handle_destroy(USBDevice *dev)
 230 {
 231     USBHostDevice *s = (USBHostDevice *)dev;
 232
 233     if (s->fd >= 0)
 234         close(s->fd);
 235     qemu_free(s);
 236 }
 237
 238 static int usb_linux_update_endp_table(USBHostDevice *s);
 239
 240 static int usb_host_handle_control(USBDevice *dev,
 241                                    int request,
 242                                    int value,
 243                                    int index,
 244                                    int length,
 245                                    uint8_t *data)
 246 {
 247     USBHostDevice *s = (USBHostDevice *)dev;
 248     struct usb_ctrltransfer ct;
 249     struct usbdevfs_setinterface si;
 250     int intf_update_required = 0;
 251     int ret;
 252
 253     if (request == (DeviceOutRequest | USB_REQ_SET_ADDRESS)) {
 254         /* specific SET_ADDRESS support */
 255         dev->addr = value;
 256         return 0;
 257     } else if (request == ((USB_RECIP_INTERFACE << 8) |
 258                            USB_REQ_SET_INTERFACE)) {
 259         /* set alternate setting for the interface */
 260         si.interface = index;
 261         si.altsetting = value;
 262         ret = ioctl(s->fd, USBDEVFS_SETINTERFACE, &si);
 263         usb_linux_update_endp_table(s);
 264     } else if (request == (DeviceOutRequest | USB_REQ_SET_CONFIGURATION)) {
 265 #ifdef DEBUG
 266         printf("usb_host_handle_control: SET_CONFIGURATION request - "
 267                "config %d\n", value & 0xff);
 268 #endif
 269         if (s->configuration != (value & 0xff)) {
 270             s->configuration = (value & 0xff);
 271             intf_update_required = 1;
 272         }
 273         goto do_request;
 274     } else {
 275     do_request:
 276         ct.bRequestType = request >> 8;
 277         ct.bRequest = request;
 278         ct.wValue = value;
 279         ct.wIndex = index;
 280         ct.wLength = length;
 281         ct.timeout = 50;
 282         ct.data = data;
 283         ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 284     }
 285
 286     if (ret < 0) {
 287         switch(errno) {
 288         case ETIMEDOUT:
 289             return USB_RET_NAK;
 290         default:
 291             return USB_RET_STALL;
 292         }
 293     } else {
 294         if (intf_update_required) {
 295 #ifdef DEBUG
 296             printf("usb_host_handle_control: updating interfaces\n");
 297 #endif
 298             usb_host_update_interfaces(s, value & 0xff);
 299         }
 300         return ret;
 301     }
 302 }
 303
 304 static int usb_host_handle_isoch(USBDevice *dev, USBPacket *p);
 305
 306 static int usb_host_handle_data(USBDevice *dev, USBPacket *p)
 307 {
 308     USBHostDevice *s = (USBHostDevice *)dev;
 309     struct usbdevfs_bulktransfer bt;
 310     int ret;
 311     uint8_t devep = p->devep;
 312
 313     if (s->endp_table[p->devep - 1].type == USBDEVFS_URB_TYPE_ISO) {
 314         return usb_host_handle_isoch(dev, p);
 315     }
 316
 317     /* XXX: optimize and handle all data types by looking at the
 318        config descriptor */
 319     if (p->pid == USB_TOKEN_IN)
 320         devep |= 0x80;
 321     bt.ep = devep;
 322     bt.len = p->len;
 323     bt.timeout = 50;
 324     bt.data = p->data;
 325     ret = ioctl(s->fd, USBDEVFS_BULK, &bt);
 326     if (ret < 0) {
 327         switch(errno) {
 328         case ETIMEDOUT:
 329             return USB_RET_NAK;
 330         case EPIPE:
 331         default:
 332 #ifdef DEBUG
 333             printf("handle_data: errno=%d\n", errno);
 334 #endif
 335             return USB_RET_STALL;
 336         }
 337     } else {
 338         return ret;
 339     }
 340 }
 341
 342 #ifdef USE_ASYNCIO
 343 static void urb_completion_pipe_read(void *opaque)
 344 {
 345     USBHostDevice *s = opaque;
 346     USBPacket *p = s->packet;
 347     PendingURB *pending_urb = NULL;
 348     struct usbdevfs_urb *purb = NULL;
 349     int len, ret;
 350
 351     len = read(s->pipe_fds[0], &pending_urb, sizeof(pending_urb));
 352     if (len != sizeof(pending_urb)) {
 353         printf("urb_completion: error reading pending_urb, len=%d\n", len);
 354         return;
 355     }
 356
 357     /* FIXME: handle pending_urb->status */
 358     del_pending_urb(pending_urb->urb);
 359
 360     if (!p) {
 361         s->urbs_ready++;
 362         return;
 363     }
 364
 365     ret = ioctl(s->fd, USBDEVFS_REAPURBNDELAY, &purb);
 366     if (ret < 0) {
 367         printf("urb_completion: REAPURBNDELAY ioctl=%d errno=%d\n",
 368                ret, errno);
 369         return;
 370     }
 371
 372 #ifdef DEBUG_ISOCH
 373     if (purb == pending_urb->urb) {
 374         printf("urb_completion: urb mismatch reaped=%p pending=%p\n",
 375                purb, urb);
 376     }
 377 #endif
 378
 379     p->len = purb->actual_length;
 380     usb_packet_complete(p);
 381     qemu_free(purb);
 382     s->packet = NULL;
 383 }
 384
 385 static void isoch_done(int signum, siginfo_t *info, void *context)
 386 {
 387     struct usbdevfs_urb *urb = (struct usbdevfs_urb *)info->si_addr;
 388     USBHostDevice *s = (USBHostDevice *)urb->usercontext;
 389     PendingURB *purb;
 390
 391     if (info->si_code != SI_ASYNCIO ||
 392         info->si_signo != SIG_ISOCOMPLETE) {
 393         return;
 394     }
 395
 396     purb = get_pending_urb(urb);
 397     if (purb) {
 398         purb->status = info->si_errno;
 399         write(s->pipe_fds[1], &purb, sizeof(purb));
 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_device_open: 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("usb_host_device_open: 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         perror("usb_host_device_open: sigaction failed");
 692         goto fail;
 693     }
 694
 695     if (pipe(dev->pipe_fds) < 0) {
 696         perror("usb_host_device_open: pipe creation failed");
 697         goto fail;
 698     }
 699     fcntl(dev->pipe_fds[0], F_SETFL, O_NONBLOCK | O_ASYNC);
 700     fcntl(dev->pipe_fds[1], F_SETFL, O_NONBLOCK);
 701     qemu_set_fd_handler(dev->pipe_fds[0], urb_completion_pipe_read, NULL, dev);
 702 #endif
 703     dev->urbs_ready = 0;
 704     return (USBDevice *)dev;
 705 fail:
 706     if (dev)
 707         qemu_free(dev);
 708     close(fd);
 709     return NULL;
 710 }
 711
 712 static int get_tag_value(char *buf, int buf_size,
 713                          const char *str, const char *tag,
 714                          const char *stopchars)
 715 {
 716     const char *p;
 717     char *q;
 718     p = strstr(str, tag);
 719     if (!p)
 720         return -1;
 721     p += strlen(tag);
 722     while (isspace(*p))
 723         p++;
 724     q = buf;
 725     while (*p != '\0' && !strchr(stopchars, *p)) {
 726         if ((q - buf) < (buf_size - 1))
 727             *q++ = *p;
 728         p++;
 729     }
 730     *q = '\0';
 731     return q - buf;
 732 }
 733
 734 static int usb_host_scan(void *opaque, USBScanFunc *func)
 735 {
 736     FILE *f;
 737     char line[1024];
 738     char buf[1024];
 739     int bus_num, addr, speed, device_count, class_id, product_id, vendor_id;
 740     int ret;
 741     char product_name[512];
 742
 743     f = fopen(USBDEVFS_PATH "/devices", "r");
 744     if (!f) {
 745         term_printf("Could not open %s\n", USBDEVFS_PATH "/devices");
 746         return 0;
 747     }
 748     device_count = 0;
 749     bus_num = addr = speed = class_id = product_id = vendor_id = 0;
 750     ret = 0;
 751     for(;;) {
 752         if (fgets(line, sizeof(line), f) == NULL)
 753             break;
 754         if (strlen(line) > 0)
 755             line[strlen(line) - 1] = '\0';
 756         if (line[0] == 'T' && line[1] == ':') {
 757             if (device_count && (vendor_id || product_id)) {
 758                 /* New device.  Add the previously discovered device.  */
 759                 ret = func(opaque, bus_num, addr, class_id, vendor_id,
 760                            product_id, product_name, speed);
 761                 if (ret)
 762                     goto the_end;
 763             }
 764             if (get_tag_value(buf, sizeof(buf), line, "Bus=", " ") < 0)
 765                 goto fail;
 766             bus_num = atoi(buf);
 767             if (get_tag_value(buf, sizeof(buf), line, "Dev#=", " ") < 0)
 768                 goto fail;
 769             addr = atoi(buf);
 770             if (get_tag_value(buf, sizeof(buf), line, "Spd=", " ") < 0)
 771                 goto fail;
 772             if (!strcmp(buf, "480"))
 773                 speed = USB_SPEED_HIGH;
 774             else if (!strcmp(buf, "1.5"))
 775                 speed = USB_SPEED_LOW;
 776             else
 777                 speed = USB_SPEED_FULL;
 778             product_name[0] = '\0';
 779             class_id = 0xff;
 780             device_count++;
 781             product_id = 0;
 782             vendor_id = 0;
 783         } else if (line[0] == 'P' && line[1] == ':') {
 784             if (get_tag_value(buf, sizeof(buf), line, "Vendor=", " ") < 0)
 785                 goto fail;
 786             vendor_id = strtoul(buf, NULL, 16);
 787             if (get_tag_value(buf, sizeof(buf), line, "ProdID=", " ") < 0)
 788                 goto fail;
 789             product_id = strtoul(buf, NULL, 16);
 790         } else if (line[0] == 'S' && line[1] == ':') {
 791             if (get_tag_value(buf, sizeof(buf), line, "Product=", "") < 0)
 792                 goto fail;
 793             pstrcpy(product_name, sizeof(product_name), buf);
 794         } else if (line[0] == 'D' && line[1] == ':') {
 795             if (get_tag_value(buf, sizeof(buf), line, "Cls=", " (") < 0)
 796                 goto fail;
 797             class_id = strtoul(buf, NULL, 16);
 798         }
 799     fail: ;
 800     }
 801     if (device_count && (vendor_id || product_id)) {
 802         /* Add the last device.  */
 803         ret = func(opaque, bus_num, addr, class_id, vendor_id,
 804                    product_id, product_name, speed);
 805     }
 806  the_end:
 807     fclose(f);
 808     return ret;
 809 }
 810
 811 typedef struct FindDeviceState {
 812     int vendor_id;
 813     int product_id;
 814     int bus_num;
 815     int addr;
 816     char product_name[PRODUCT_NAME_SZ];
 817 } FindDeviceState;
 818
 819 static int usb_host_find_device_scan(void *opaque, int bus_num, int addr,
 820                                      int class_id,
 821                                      int vendor_id, int product_id,
 822                                      const char *product_name, int speed)
 823 {
 824     FindDeviceState *s = opaque;
 825     if ((vendor_id == s->vendor_id &&
 826         product_id == s->product_id) ||
 827         (bus_num == s->bus_num &&
 828         addr == s->addr)) {
 829         pstrcpy(s->product_name, PRODUCT_NAME_SZ, product_name);
 830         s->bus_num = bus_num;
 831         s->addr = addr;
 832         return 1;
 833     } else {
 834         return 0;
 835     }
 836 }
 837
 838 /* the syntax is :
 839    'bus.addr' (decimal numbers) or
 840    'vendor_id:product_id' (hexa numbers) */
 841 static int usb_host_find_device(int *pbus_num, int *paddr,
 842                                 char *product_name, int product_name_size,
 843                                 const char *devname)
 844 {
 845     const char *p;
 846     int ret;
 847     FindDeviceState fs;
 848
 849     p = strchr(devname, '.');
 850     if (p) {
 851         *pbus_num = strtoul(devname, NULL, 0);
 852         *paddr = strtoul(p + 1, NULL, 0);
 853         fs.bus_num = *pbus_num;
 854         fs.addr = *paddr;
 855         ret = usb_host_scan(&fs, usb_host_find_device_scan);
 856         if (ret)
 857             pstrcpy(product_name, product_name_size, fs.product_name);
 858         return 0;
 859     }
 860     p = strchr(devname, ':');
 861     if (p) {
 862         fs.vendor_id = strtoul(devname, NULL, 16);
 863         fs.product_id = strtoul(p + 1, NULL, 16);
 864         ret = usb_host_scan(&fs, usb_host_find_device_scan);
 865         if (ret) {
 866             *pbus_num = fs.bus_num;
 867             *paddr = fs.addr;
 868             pstrcpy(product_name, product_name_size, fs.product_name);
 869             return 0;
 870         }
 871     }
 872     return -1;
 873 }
 874
 875 /**********************/
 876 /* USB host device info */
 877
 878 struct usb_class_info {
 879     int class;
 880     const char *class_name;
 881 };
 882
 883 static const struct usb_class_info usb_class_info[] = {
 884     { USB_CLASS_AUDIO, "Audio"},
 885     { USB_CLASS_COMM, "Communication"},
 886     { USB_CLASS_HID, "HID"},
 887     { USB_CLASS_HUB, "Hub" },
 888     { USB_CLASS_PHYSICAL, "Physical" },
 889     { USB_CLASS_PRINTER, "Printer" },
 890     { USB_CLASS_MASS_STORAGE, "Storage" },
 891     { USB_CLASS_CDC_DATA, "Data" },
 892     { USB_CLASS_APP_SPEC, "Application Specific" },
 893     { USB_CLASS_VENDOR_SPEC, "Vendor Specific" },
 894     { USB_CLASS_STILL_IMAGE, "Still Image" },
 895     { USB_CLASS_CSCID, "Smart Card" },
 896     { USB_CLASS_CONTENT_SEC, "Content Security" },
 897     { -1, NULL }
 898 };
 899
 900 static const char *usb_class_str(uint8_t class)
 901 {
 902     const struct usb_class_info *p;
 903     for(p = usb_class_info; p->class != -1; p++) {
 904         if (p->class == class)
 905             break;
 906     }
 907     return p->class_name;
 908 }
 909
 910 static void usb_info_device(int bus_num, int addr, int class_id,
 911                             int vendor_id, int product_id,
 912                             const char *product_name,
 913                             int speed)
 914 {
 915     const char *class_str, *speed_str;
 916
 917     switch(speed) {
 918     case USB_SPEED_LOW:
 919         speed_str = "1.5";
 920         break;
 921     case USB_SPEED_FULL:
 922         speed_str = "12";
 923         break;
 924     case USB_SPEED_HIGH:
 925         speed_str = "480";
 926         break;
 927     default:
 928         speed_str = "?";
 929         break;
 930     }
 931
 932     term_printf("  Device %d.%d, speed %s Mb/s\n",
 933                 bus_num, addr, speed_str);
 934     class_str = usb_class_str(class_id);
 935     if (class_str)
 936         term_printf("    %s:", class_str);
 937     else
 938         term_printf("    Class %02x:", class_id);
 939     term_printf(" USB device %04x:%04x", vendor_id, product_id);
 940     if (product_name[0] != '\0')
 941         term_printf(", %s", product_name);
 942     term_printf("\n");
 943 }
 944
 945 static int usb_host_info_device(void *opaque, int bus_num, int addr,
 946                                 int class_id,
 947                                 int vendor_id, int product_id,
 948                                 const char *product_name,
 949                                 int speed)
 950 {
 951     usb_info_device(bus_num, addr, class_id, vendor_id, product_id,
 952                     product_name, speed);
 953     return 0;
 954 }
 955
 956 void usb_host_info(void)
 957 {
 958     usb_host_scan(NULL, usb_host_info_device);
 959 }
 960
 961 #else
 962
 963 void usb_host_info(void)
 964 {
 965     term_printf("USB host devices not supported\n");
 966 }
 967
 968 /* XXX: modify configure to compile the right host driver */
 969 USBDevice *usb_host_device_open(const char *devname)
 970 {
 971     return NULL;
 972 }
 973
 974 #endif