usb-linux.c

   1 /*
   2  * Linux host USB redirector
   3  *
   4  * Copyright (c) 2005 Fabrice Bellard
   5  *
   6  * Copyright (c) 2008 Max Krasnyansky
   7  *      Support for host device auto connect & disconnect
   8  *      Magor rewrite to support fully async operation
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26  * THE SOFTWARE.
  27  */
  28 #include "qemu-common.h"
  29 #include "qemu-timer.h"
  30 #include "hw/usb.h"
  31 #include "console.h"
  32
  33 #if defined(__linux__)
  34 #include <dirent.h>
  35 #include <sys/ioctl.h>
  36 #include <linux/usbdevice_fs.h>
  37 #include <linux/version.h>
  38 #include <signal.h>
  39
  40 /* We redefine it to avoid version problems */
  41 struct usb_ctrltransfer {
  42     uint8_t  bRequestType;
  43     uint8_t  bRequest;
  44     uint16_t wValue;
  45     uint16_t wIndex;
  46     uint16_t wLength;
  47     uint32_t timeout;
  48     void *data;
  49 };
  50
  51 typedef int USBScanFunc(void *opaque, int bus_num, int addr, int class_id,
  52                         int vendor_id, int product_id,
  53                         const char *product_name, int speed);
  54 static int usb_host_find_device(int *pbus_num, int *paddr,
  55                                 char *product_name, int product_name_size,
  56                                 const char *devname);
  57
  58 //#define DEBUG
  59
  60 #ifdef DEBUG
  61 #define dprintf printf
  62 #else
  63 #define dprintf(...)
  64 #endif
  65
  66 #define USBDEVFS_PATH "/proc/bus/usb"
  67 #define PRODUCT_NAME_SZ 32
  68 #define MAX_ENDPOINTS 16
  69
  70 struct sigaction sigact;
  71
  72 /* endpoint association data */
  73 struct endp_data {
  74     uint8_t type;
  75     uint8_t halted;
  76 };
  77
  78 typedef struct USBHostDevice {
  79     USBDevice dev;
  80     int       fd;
  81
  82     uint8_t   descr[1024];
  83     int       descr_len;
  84     int       configuration;
  85     int       closing;
  86
  87     struct endp_data endp_table[MAX_ENDPOINTS];
  88
  89     /* Host side address */
  90     int bus_num;
  91     int addr;
  92
  93     struct USBHostDevice *next;
  94 } USBHostDevice;
  95
  96 static int is_isoc(USBHostDevice *s, int ep)
  97 {
  98     return s->endp_table[ep - 1].type == USBDEVFS_URB_TYPE_ISO;
  99 }
 100
 101 static int is_halted(USBHostDevice *s, int ep)
 102 {
 103     return s->endp_table[ep - 1].halted;
 104 }
 105
 106 static void clear_halt(USBHostDevice *s, int ep)
 107 {
 108     s->endp_table[ep - 1].halted = 0;
 109 }
 110
 111 static void set_halt(USBHostDevice *s, int ep)
 112 {
 113     s->endp_table[ep - 1].halted = 1;
 114 }
 115
 116 static USBHostDevice *hostdev_list;
 117
 118 static void hostdev_link(USBHostDevice *dev)
 119 {
 120     dev->next = hostdev_list;
 121     hostdev_list = dev;
 122 }
 123
 124 static void hostdev_unlink(USBHostDevice *dev)
 125 {
 126     USBHostDevice *pdev = hostdev_list;
 127     USBHostDevice **prev = &hostdev_list;
 128
 129     while (pdev) {
 130         if (pdev == dev) {
 131             *prev = dev->next;
 132             return;
 133         }
 134
 135         prev = &pdev->next;
 136         pdev = pdev->next;
 137     }
 138 }
 139
 140 static USBHostDevice *hostdev_find(int bus_num, int addr)
 141 {
 142     USBHostDevice *s = hostdev_list;
 143     while (s) {
 144         if (s->bus_num == bus_num && s->addr == addr)
 145             return s;
 146         s = s->next;
 147     }
 148     return NULL;
 149 }
 150
 151 /*
 152  * Async URB state.
 153  * We always allocate one isoc descriptor even for bulk transfers
 154  * to simplify allocation and casts.
 155  */
 156 typedef struct AsyncURB
 157 {
 158     struct usbdevfs_urb urb;
 159     struct usbdevfs_iso_packet_desc isocpd;
 160
 161     USBPacket     *packet;
 162     USBHostDevice *hdev;
 163 } AsyncURB;
 164
 165 static AsyncURB *async_alloc(void)
 166 {
 167     return (AsyncURB *) qemu_mallocz(sizeof(AsyncURB));
 168 }
 169
 170 static void async_free(AsyncURB *aurb)
 171 {
 172     qemu_free(aurb);
 173 }
 174
 175 static void async_complete(void *opaque)
 176 {
 177     USBHostDevice *s = opaque;
 178     AsyncURB *aurb;
 179
 180     while (1) {
 181         USBPacket *p;
 182
 183         int r = ioctl(s->fd, USBDEVFS_REAPURBNDELAY, &aurb);
 184         if (r < 0) {
 185             if (errno == EAGAIN)
 186                 return;
 187
 188             if (errno == ENODEV && !s->closing) {
 189                 printf("husb: device %d.%d disconnected\n", s->bus_num, s->addr);
 190                 usb_device_del_addr(0, s->dev.addr);
 191                 return;
 192             }
 193
 194             dprintf("husb: async. reap urb failed errno %d\n", errno);
 195             return;
 196         }
 197
 198         p = aurb->packet;
 199
 200         dprintf("husb: async completed. aurb %p status %d alen %d\n",
 201                 aurb, aurb->urb.status, aurb->urb.actual_length);
 202
 203         if (p) {
 204             switch (aurb->urb.status) {
 205             case 0:
 206                 p->len = aurb->urb.actual_length;
 207                 break;
 208
 209             case -EPIPE:
 210                 set_halt(s, p->devep);
 211                 /* fall through */
 212             default:
 213                 p->len = USB_RET_NAK;
 214                 break;
 215             }
 216
 217             usb_packet_complete(p);
 218         }
 219
 220         async_free(aurb);
 221     }
 222 }
 223
 224 static void async_cancel(USBPacket *unused, void *opaque)
 225 {
 226     AsyncURB *aurb = opaque;
 227     USBHostDevice *s = aurb->hdev;
 228
 229     dprintf("husb: async cancel. aurb %p\n", aurb);
 230
 231     /* Mark it as dead (see async_complete above) */
 232     aurb->packet = NULL;
 233
 234     int r = ioctl(s->fd, USBDEVFS_DISCARDURB, aurb);
 235     if (r < 0) {
 236         dprintf("husb: async. discard urb failed errno %d\n", errno);
 237     }
 238 }
 239
 240 static int usb_host_update_interfaces(USBHostDevice *dev, int configuration)
 241 {
 242     int dev_descr_len, config_descr_len;
 243     int interface, nb_interfaces, nb_configurations;
 244     int ret, i;
 245
 246     if (configuration == 0) /* address state - ignore */
 247         return 1;
 248
 249     i = 0;
 250     dev_descr_len = dev->descr[0];
 251     if (dev_descr_len > dev->descr_len)
 252         goto fail;
 253     nb_configurations = dev->descr[17];
 254
 255     i += dev_descr_len;
 256     while (i < dev->descr_len) {
 257         dprintf("husb: i is %d, descr_len is %d, dl %d, dt %d\n", i, dev->descr_len,
 258                dev->descr[i], dev->descr[i+1]);
 259
 260         if (dev->descr[i+1] != USB_DT_CONFIG) {
 261             i += dev->descr[i];
 262             continue;
 263         }
 264         config_descr_len = dev->descr[i];
 265
 266         printf("husb: config #%d need %d\n", dev->descr[i + 5], configuration);
 267
 268         if (configuration < 0 || configuration == dev->descr[i + 5])
 269             break;
 270
 271         i += config_descr_len;
 272     }
 273
 274     if (i >= dev->descr_len) {
 275         fprintf(stderr, "husb: update iface failed. no matching configuration\n");
 276         goto fail;
 277     }
 278     nb_interfaces = dev->descr[i + 4];
 279
 280 #ifdef USBDEVFS_DISCONNECT
 281     /* earlier Linux 2.4 do not support that */
 282     {
 283         struct usbdevfs_ioctl ctrl;
 284         for (interface = 0; interface < nb_interfaces; interface++) {
 285             ctrl.ioctl_code = USBDEVFS_DISCONNECT;
 286             ctrl.ifno = interface;
 287             ret = ioctl(dev->fd, USBDEVFS_IOCTL, &ctrl);
 288             if (ret < 0 && errno != ENODATA) {
 289                 perror("USBDEVFS_DISCONNECT");
 290                 goto fail;
 291             }
 292         }
 293     }
 294 #endif
 295
 296     /* XXX: only grab if all interfaces are free */
 297     for (interface = 0; interface < nb_interfaces; interface++) {
 298         ret = ioctl(dev->fd, USBDEVFS_CLAIMINTERFACE, &interface);
 299         if (ret < 0) {
 300             if (errno == EBUSY) {
 301                 printf("husb: update iface. device already grabbed\n");
 302             } else {
 303                 perror("husb: failed to claim interface");
 304             }
 305         fail:
 306             return 0;
 307         }
 308     }
 309
 310     printf("husb: %d interfaces claimed for configuration %d\n",
 311            nb_interfaces, configuration);
 312
 313     return 1;
 314 }
 315
 316 static void usb_host_handle_reset(USBDevice *dev)
 317 {
 318     USBHostDevice *s = (USBHostDevice *)dev;
 319
 320     dprintf("husb: reset device %u.%u\n", s->bus_num, s->addr);
 321
 322     ioctl(s->fd, USBDEVFS_RESET);
 323     usb_host_update_interfaces(s, s->configuration);
 324 }
 325
 326 static void usb_host_handle_destroy(USBDevice *dev)
 327 {
 328     USBHostDevice *s = (USBHostDevice *)dev;
 329
 330     s->closing = 1;
 331
 332     qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 333
 334     hostdev_unlink(s);
 335
 336     async_complete(s);
 337
 338     if (s->fd >= 0)
 339         close(s->fd);
 340
 341     qemu_free(s);
 342 }
 343
 344 static int usb_linux_update_endp_table(USBHostDevice *s);
 345
 346 static int usb_host_handle_control(USBDevice *dev,
 347                                    int request,
 348                                    int value,
 349                                    int index,
 350                                    int length,
 351                                    uint8_t *data)
 352 {
 353     USBHostDevice *s = (USBHostDevice *)dev;
 354     struct usb_ctrltransfer ct;
 355     struct usbdevfs_setinterface si;
 356     int intf_update_required = 0;
 357     int ret;
 358
 359     if (request == (DeviceOutRequest | USB_REQ_SET_ADDRESS)) {
 360         /* specific SET_ADDRESS support */
 361         dev->addr = value;
 362         return 0;
 363     } else if (request == ((USB_RECIP_INTERFACE << 8) |
 364                            USB_REQ_SET_INTERFACE)) {
 365         /* set alternate setting for the interface */
 366         si.interface = index;
 367         si.altsetting = value;
 368         ret = ioctl(s->fd, USBDEVFS_SETINTERFACE, &si);
 369         usb_linux_update_endp_table(s);
 370     } else if (request == (DeviceOutRequest | USB_REQ_SET_CONFIGURATION)) {
 371         dprintf("husb: ctrl set config %d\n", value & 0xff);
 372         if (s->configuration != (value & 0xff)) {
 373             s->configuration = (value & 0xff);
 374             intf_update_required = 1;
 375         }
 376         goto do_request;
 377     } else {
 378     do_request:
 379         ct.bRequestType = request >> 8;
 380         ct.bRequest = request;
 381         ct.wValue = value;
 382         ct.wIndex = index;
 383         ct.wLength = length;
 384         ct.timeout = 50;
 385         ct.data = data;
 386         ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 387
 388         dprintf("husb: ctrl req 0x%x val 0x%x index %u len %u ret %d\n",
 389             ct.bRequest, ct.wValue, ct.wIndex, ct.wLength, ret);
 390     }
 391
 392     if (ret < 0) {
 393         switch(errno) {
 394         case ETIMEDOUT:
 395             return USB_RET_NAK;
 396         default:
 397             return USB_RET_STALL;
 398         }
 399     } else {
 400         if (intf_update_required) {
 401             dprintf("husb: updating interfaces\n");
 402             usb_host_update_interfaces(s, value & 0xff);
 403         }
 404         return ret;
 405     }
 406 }
 407
 408 static int usb_host_handle_data(USBDevice *dev, USBPacket *p)
 409 {
 410     USBHostDevice *s = (USBHostDevice *) dev;
 411     AsyncURB *aurb;
 412     struct usbdevfs_urb *urb;
 413     int ret;
 414
 415     aurb = async_alloc();
 416     if (!aurb) {
 417         dprintf("husb: async malloc failed\n");
 418         return USB_RET_NAK;
 419     }
 420     aurb->hdev   = s;
 421     aurb->packet = p;
 422
 423     urb = &aurb->urb;
 424
 425     if (p->pid == USB_TOKEN_IN)
 426         urb->endpoint = p->devep | 0x80;
 427     else
 428         urb->endpoint = p->devep;
 429
 430     if (is_halted(s, p->devep)) {
 431         ret = ioctl(s->fd, USBDEVFS_CLEAR_HALT, &urb->endpoint);
 432         if (ret < 0) {
 433             dprintf("husb: failed to clear halt. ep 0x%x errno %d\n",
 434                    urb->endpoint, errno);
 435             return USB_RET_NAK;
 436         }
 437         clear_halt(s, p->devep);
 438     }
 439
 440     urb->buffer        = p->data;
 441     urb->buffer_length = p->len;
 442
 443     if (is_isoc(s, p->devep)) {
 444         /* Setup ISOC transfer */
 445         urb->type     = USBDEVFS_URB_TYPE_ISO;
 446         urb->flags    = USBDEVFS_URB_ISO_ASAP;
 447         urb->number_of_packets = 1;
 448         urb->iso_frame_desc[0].length = p->len;
 449     } else {
 450         /* Setup bulk transfer */
 451         urb->type     = USBDEVFS_URB_TYPE_BULK;
 452     }
 453
 454     urb->usercontext = s;
 455
 456     ret = ioctl(s->fd, USBDEVFS_SUBMITURB, urb);
 457
 458     dprintf("husb: data submit. ep 0x%x len %u aurb %p\n", urb->endpoint, p->len, aurb);
 459
 460     if (ret < 0) {
 461         dprintf("husb: submit failed. errno %d\n", errno);
 462         async_free(aurb);
 463
 464         switch(errno) {
 465         case ETIMEDOUT:
 466             return USB_RET_NAK;
 467         case EPIPE:
 468         default:
 469             return USB_RET_STALL;
 470         }
 471     }
 472
 473     usb_defer_packet(p, async_cancel, aurb);
 474     return USB_RET_ASYNC;
 475 }
 476
 477 /* returns 1 on problem encountered or 0 for success */
 478 static int usb_linux_update_endp_table(USBHostDevice *s)
 479 {
 480     uint8_t *descriptors;
 481     uint8_t devep, type, configuration, alt_interface;
 482     struct usb_ctrltransfer ct;
 483     int interface, ret, length, i;
 484
 485     ct.bRequestType = USB_DIR_IN;
 486     ct.bRequest = USB_REQ_GET_CONFIGURATION;
 487     ct.wValue = 0;
 488     ct.wIndex = 0;
 489     ct.wLength = 1;
 490     ct.data = &configuration;
 491     ct.timeout = 50;
 492
 493     ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 494     if (ret < 0) {
 495         perror("usb_linux_update_endp_table");
 496         return 1;
 497     }
 498
 499     /* in address state */
 500     if (configuration == 0)
 501         return 1;
 502
 503     /* get the desired configuration, interface, and endpoint descriptors
 504      * from device description */
 505     descriptors = &s->descr[18];
 506     length = s->descr_len - 18;
 507     i = 0;
 508
 509     if (descriptors[i + 1] != USB_DT_CONFIG ||
 510         descriptors[i + 5] != configuration) {
 511         dprintf("invalid descriptor data - configuration\n");
 512         return 1;
 513     }
 514     i += descriptors[i];
 515
 516     while (i < length) {
 517         if (descriptors[i + 1] != USB_DT_INTERFACE ||
 518             (descriptors[i + 1] == USB_DT_INTERFACE &&
 519              descriptors[i + 4] == 0)) {
 520             i += descriptors[i];
 521             continue;
 522         }
 523
 524         interface = descriptors[i + 2];
 525
 526         ct.bRequestType = USB_DIR_IN | USB_RECIP_INTERFACE;
 527         ct.bRequest = USB_REQ_GET_INTERFACE;
 528         ct.wValue = 0;
 529         ct.wIndex = interface;
 530         ct.wLength = 1;
 531         ct.data = &alt_interface;
 532         ct.timeout = 50;
 533
 534         ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
 535         if (ret < 0) {
 536             perror("usb_linux_update_endp_table");
 537             return 1;
 538         }
 539
 540         /* the current interface descriptor is the active interface
 541          * and has endpoints */
 542         if (descriptors[i + 3] != alt_interface) {
 543             i += descriptors[i];
 544             continue;
 545         }
 546
 547         /* advance to the endpoints */
 548         while (i < length && descriptors[i +1] != USB_DT_ENDPOINT)
 549             i += descriptors[i];
 550
 551         if (i >= length)
 552             break;
 553
 554         while (i < length) {
 555             if (descriptors[i + 1] != USB_DT_ENDPOINT)
 556                 break;
 557
 558             devep = descriptors[i + 2];
 559             switch (descriptors[i + 3] & 0x3) {
 560             case 0x00:
 561                 type = USBDEVFS_URB_TYPE_CONTROL;
 562                 break;
 563             case 0x01:
 564                 type = USBDEVFS_URB_TYPE_ISO;
 565                 break;
 566             case 0x02:
 567                 type = USBDEVFS_URB_TYPE_BULK;
 568                 break;
 569             case 0x03:
 570                 type = USBDEVFS_URB_TYPE_INTERRUPT;
 571                 break;
 572             default:
 573                 dprintf("usb_host: malformed endpoint type\n");
 574                 type = USBDEVFS_URB_TYPE_BULK;
 575             }
 576             s->endp_table[(devep & 0xf) - 1].type = type;
 577             s->endp_table[(devep & 0xf) - 1].halted = 0;
 578
 579             i += descriptors[i];
 580         }
 581     }
 582     return 0;
 583 }
 584
 585 static USBDevice *usb_host_device_open_addr(int bus_num, int addr, const char *prod_name)
 586 {
 587     int fd = -1, ret;
 588     USBHostDevice *dev = NULL;
 589     struct usbdevfs_connectinfo ci;
 590     char buf[1024];
 591
 592     dev = qemu_mallocz(sizeof(USBHostDevice));
 593     if (!dev)
 594         goto fail;
 595
 596     dev->bus_num = bus_num;
 597     dev->addr = addr;
 598
 599     printf("husb: open device %d.%d\n", bus_num, addr);
 600
 601     snprintf(buf, sizeof(buf), USBDEVFS_PATH "/%03d/%03d",
 602              bus_num, addr);
 603     fd = open(buf, O_RDWR | O_NONBLOCK);
 604     if (fd < 0) {
 605         perror(buf);
 606         goto fail;
 607     }
 608
 609     /* read the device description */
 610     dev->descr_len = read(fd, dev->descr, sizeof(dev->descr));
 611     if (dev->descr_len <= 0) {
 612         perror("husb: reading device data failed");
 613         goto fail;
 614     }
 615
 616 #ifdef DEBUG
 617     {
 618         int x;
 619         printf("=== begin dumping device descriptor data ===\n");
 620         for (x = 0; x < dev->descr_len; x++)
 621             printf("%02x ", dev->descr[x]);
 622         printf("\n=== end dumping device descriptor data ===\n");
 623     }
 624 #endif
 625
 626     dev->fd = fd;
 627     dev->configuration = 1;
 628
 629     /* XXX - do something about initial configuration */
 630     if (!usb_host_update_interfaces(dev, -1))
 631         goto fail;
 632
 633     ret = ioctl(fd, USBDEVFS_CONNECTINFO, &ci);
 634     if (ret < 0) {
 635         perror("usb_host_device_open: USBDEVFS_CONNECTINFO");
 636         goto fail;
 637     }
 638
 639     printf("husb: grabbed usb device %d.%d\n", bus_num, addr);
 640
 641     ret = usb_linux_update_endp_table(dev);
 642     if (ret)
 643         goto fail;
 644
 645     if (ci.slow)
 646         dev->dev.speed = USB_SPEED_LOW;
 647     else
 648         dev->dev.speed = USB_SPEED_HIGH;
 649     dev->dev.handle_packet = usb_generic_handle_packet;
 650
 651     dev->dev.handle_reset = usb_host_handle_reset;
 652     dev->dev.handle_control = usb_host_handle_control;
 653     dev->dev.handle_data = usb_host_handle_data;
 654     dev->dev.handle_destroy = usb_host_handle_destroy;
 655
 656     if (!prod_name || prod_name[0] == '\0')
 657         snprintf(dev->dev.devname, sizeof(dev->dev.devname),
 658                  "host:%d.%d", bus_num, addr);
 659     else
 660         pstrcpy(dev->dev.devname, sizeof(dev->dev.devname),
 661                 prod_name);
 662
 663     /* USB devio uses 'write' flag to check for async completions */
 664     qemu_set_fd_handler(dev->fd, NULL, async_complete, dev);
 665
 666     hostdev_link(dev);
 667
 668     return (USBDevice *) dev;
 669
 670 fail:
 671     if (dev)
 672         qemu_free(dev);
 673
 674     close(fd);
 675     return NULL;
 676 }
 677
 678 USBDevice *usb_host_device_open(const char *devname)
 679 {
 680     int bus_num, addr;
 681     char product_name[PRODUCT_NAME_SZ];
 682
 683     if (usb_host_find_device(&bus_num, &addr,
 684                              product_name, sizeof(product_name),
 685                              devname) < 0)
 686         return NULL;
 687
 688      if (hostdev_find(bus_num, addr)) {
 689         term_printf("husb: host usb device %d.%d is already open\n", bus_num, addr);
 690         return NULL;
 691      }
 692
 693     return usb_host_device_open_addr(bus_num, addr, product_name);
 694 }
 695
 696 static int get_tag_value(char *buf, int buf_size,
 697                          const char *str, const char *tag,
 698                          const char *stopchars)
 699 {
 700     const char *p;
 701     char *q;
 702     p = strstr(str, tag);
 703     if (!p)
 704         return -1;
 705     p += strlen(tag);
 706     while (isspace(*p))
 707         p++;
 708     q = buf;
 709     while (*p != '\0' && !strchr(stopchars, *p)) {
 710         if ((q - buf) < (buf_size - 1))
 711             *q++ = *p;
 712         p++;
 713     }
 714     *q = '\0';
 715     return q - buf;
 716 }
 717
 718 static int usb_host_scan(void *opaque, USBScanFunc *func)
 719 {
 720     FILE *f;
 721     char line[1024];
 722     char buf[1024];
 723     int bus_num, addr, speed, device_count, class_id, product_id, vendor_id;
 724     int ret;
 725     char product_name[512];
 726
 727     f = fopen(USBDEVFS_PATH "/devices", "r");
 728     if (!f) {
 729         term_printf("husb: could not open %s\n", USBDEVFS_PATH "/devices");
 730         return 0;
 731     }
 732     device_count = 0;
 733     bus_num = addr = speed = class_id = product_id = vendor_id = 0;
 734     ret = 0;
 735     for(;;) {
 736         if (fgets(line, sizeof(line), f) == NULL)
 737             break;
 738         if (strlen(line) > 0)
 739             line[strlen(line) - 1] = '\0';
 740         if (line[0] == 'T' && line[1] == ':') {
 741             if (device_count && (vendor_id || product_id)) {
 742                 /* New device.  Add the previously discovered device.  */
 743                 ret = func(opaque, bus_num, addr, class_id, vendor_id,
 744                            product_id, product_name, speed);
 745                 if (ret)
 746                     goto the_end;
 747             }
 748             if (get_tag_value(buf, sizeof(buf), line, "Bus=", " ") < 0)
 749                 goto fail;
 750             bus_num = atoi(buf);
 751             if (get_tag_value(buf, sizeof(buf), line, "Dev#=", " ") < 0)
 752                 goto fail;
 753             addr = atoi(buf);
 754             if (get_tag_value(buf, sizeof(buf), line, "Spd=", " ") < 0)
 755                 goto fail;
 756             if (!strcmp(buf, "480"))
 757                 speed = USB_SPEED_HIGH;
 758             else if (!strcmp(buf, "1.5"))
 759                 speed = USB_SPEED_LOW;
 760             else
 761                 speed = USB_SPEED_FULL;
 762             product_name[0] = '\0';
 763             class_id = 0xff;
 764             device_count++;
 765             product_id = 0;
 766             vendor_id = 0;
 767         } else if (line[0] == 'P' && line[1] == ':') {
 768             if (get_tag_value(buf, sizeof(buf), line, "Vendor=", " ") < 0)
 769                 goto fail;
 770             vendor_id = strtoul(buf, NULL, 16);
 771             if (get_tag_value(buf, sizeof(buf), line, "ProdID=", " ") < 0)
 772                 goto fail;
 773             product_id = strtoul(buf, NULL, 16);
 774         } else if (line[0] == 'S' && line[1] == ':') {
 775             if (get_tag_value(buf, sizeof(buf), line, "Product=", "") < 0)
 776                 goto fail;
 777             pstrcpy(product_name, sizeof(product_name), buf);
 778         } else if (line[0] == 'D' && line[1] == ':') {
 779             if (get_tag_value(buf, sizeof(buf), line, "Cls=", " (") < 0)
 780                 goto fail;
 781             class_id = strtoul(buf, NULL, 16);
 782         }
 783     fail: ;
 784     }
 785     if (device_count && (vendor_id || product_id)) {
 786         /* Add the last device.  */
 787         ret = func(opaque, bus_num, addr, class_id, vendor_id,
 788                    product_id, product_name, speed);
 789     }
 790  the_end:
 791     fclose(f);
 792     return ret;
 793 }
 794
 795 struct USBAutoFilter {
 796     struct USBAutoFilter *next;
 797     int bus_num;
 798     int addr;
 799     int vendor_id;
 800     int product_id;
 801 };
 802
 803 static QEMUTimer *usb_auto_timer;
 804 static struct USBAutoFilter *usb_auto_filter;
 805
 806 static int usb_host_auto_scan(void *opaque, int bus_num, int addr,
 807                      int class_id, int vendor_id, int product_id,
 808                      const char *product_name, int speed)
 809 {
 810     struct USBAutoFilter *f;
 811     struct USBDevice *dev;
 812
 813     /* Ignore hubs */
 814     if (class_id == 9)
 815         return 0;
 816
 817     for (f = usb_auto_filter; f; f = f->next) {
 818         if (f->bus_num >= 0 && f->bus_num != bus_num)
 819             continue;
 820
 821         if (f->addr >= 0 && f->addr != addr)
 822             continue;
 823
 824         if (f->vendor_id >= 0 && f->vendor_id != vendor_id)
 825             continue;
 826
 827         if (f->product_id >= 0 && f->product_id != product_id)
 828             continue;
 829
 830         /* We got a match */
 831
 832         /* Allredy attached ? */
 833         if (hostdev_find(bus_num, addr))
 834             return 0;
 835
 836         dprintf("husb: auto open: bus_num %d addr %d\n", bus_num, addr);
 837
 838         dev = usb_host_device_open_addr(bus_num, addr, product_name);
 839         if (dev)
 840             usb_device_add_dev(dev);
 841     }
 842
 843     return 0;
 844 }
 845
 846 static void usb_host_auto_timer(void *unused)
 847 {
 848     usb_host_scan(NULL, usb_host_auto_scan);
 849     qemu_mod_timer(usb_auto_timer, qemu_get_clock(rt_clock) + 2000);
 850 }
 851
 852 /*
 853  * Add autoconnect filter
 854  * -1 means 'any' (device, vendor, etc)
 855  */
 856 static void usb_host_auto_add(int bus_num, int addr, int vendor_id, int product_id)
 857 {
 858     struct USBAutoFilter *f = qemu_mallocz(sizeof(*f));
 859     if (!f) {
 860         fprintf(stderr, "husb: failed to allocate auto filter\n");
 861         return;
 862     }
 863
 864     f->bus_num = bus_num;
 865     f->addr    = addr;
 866     f->vendor_id  = vendor_id;
 867     f->product_id = product_id;
 868
 869     if (!usb_auto_filter) {
 870         /*
 871          * First entry. Init and start the monitor.
 872          * Right now we're using timer to check for new devices.
 873          * If this turns out to be too expensive we can move that into a
 874          * separate thread.
 875          */
 876         usb_auto_timer = qemu_new_timer(rt_clock, usb_host_auto_timer, NULL);
 877         if (!usb_auto_timer) {
 878             fprintf(stderr, "husb: failed to allocate auto scan timer\n");
 879             qemu_free(f);
 880             return;
 881         }
 882
 883         /* Check for new devices every two seconds */
 884         qemu_mod_timer(usb_auto_timer, qemu_get_clock(rt_clock) + 2000);
 885     }
 886
 887     dprintf("husb: auto filter: bus_num %d addr %d vid %d pid %d\n",
 888         bus_num, addr, vendor_id, product_id);
 889
 890     f->next = usb_auto_filter;
 891     usb_auto_filter = f;
 892 }
 893
 894 typedef struct FindDeviceState {
 895     int vendor_id;
 896     int product_id;
 897     int bus_num;
 898     int addr;
 899     char product_name[PRODUCT_NAME_SZ];
 900 } FindDeviceState;
 901
 902 static int usb_host_find_device_scan(void *opaque, int bus_num, int addr,
 903                                      int class_id,
 904                                      int vendor_id, int product_id,
 905                                      const char *product_name, int speed)
 906 {
 907     FindDeviceState *s = opaque;
 908     if ((vendor_id == s->vendor_id &&
 909         product_id == s->product_id) ||
 910         (bus_num == s->bus_num &&
 911         addr == s->addr)) {
 912         pstrcpy(s->product_name, PRODUCT_NAME_SZ, product_name);
 913         s->bus_num = bus_num;
 914         s->addr = addr;
 915         return 1;
 916     } else {
 917         return 0;
 918     }
 919 }
 920
 921 /* the syntax is :
 922    'bus.addr' (decimal numbers) or
 923    'vendor_id:product_id' (hexa numbers) */
 924 static int usb_host_find_device(int *pbus_num, int *paddr,
 925                                 char *product_name, int product_name_size,
 926                                 const char *devname)
 927 {
 928     const char *p;
 929     int ret;
 930     FindDeviceState fs;
 931
 932     p = strchr(devname, '.');
 933     if (p) {
 934         *pbus_num = strtoul(devname, NULL, 0);
 935
 936         if (*(p + 1) == '*') {
 937             usb_host_auto_add(*pbus_num, -1, -1, -1);
 938             return -1;
 939         }
 940
 941         *paddr = strtoul(p + 1, NULL, 0);
 942         fs.bus_num = *pbus_num;
 943         fs.addr = *paddr;
 944         ret = usb_host_scan(&fs, usb_host_find_device_scan);
 945         if (ret)
 946             pstrcpy(product_name, product_name_size, fs.product_name);
 947         return 0;
 948     }
 949     p = strchr(devname, ':');
 950     if (p) {
 951         fs.vendor_id = strtoul(devname, NULL, 16);
 952
 953         if (*(p + 1) == '*') {
 954             usb_host_auto_add(-1, -1, fs.vendor_id, -1);
 955             return -1;
 956         }
 957
 958         fs.product_id = strtoul(p + 1, NULL, 16);
 959         ret = usb_host_scan(&fs, usb_host_find_device_scan);
 960         if (ret) {
 961             *pbus_num = fs.bus_num;
 962             *paddr = fs.addr;
 963             pstrcpy(product_name, product_name_size, fs.product_name);
 964             return 0;
 965         }
 966     }
 967     return -1;
 968 }
 969
 970 /**********************/
 971 /* USB host device info */
 972
 973 struct usb_class_info {
 974     int class;
 975     const char *class_name;
 976 };
 977
 978 static const struct usb_class_info usb_class_info[] = {
 979     { USB_CLASS_AUDIO, "Audio"},
 980     { USB_CLASS_COMM, "Communication"},
 981     { USB_CLASS_HID, "HID"},
 982     { USB_CLASS_HUB, "Hub" },
 983     { USB_CLASS_PHYSICAL, "Physical" },
 984     { USB_CLASS_PRINTER, "Printer" },
 985     { USB_CLASS_MASS_STORAGE, "Storage" },
 986     { USB_CLASS_CDC_DATA, "Data" },
 987     { USB_CLASS_APP_SPEC, "Application Specific" },
 988     { USB_CLASS_VENDOR_SPEC, "Vendor Specific" },
 989     { USB_CLASS_STILL_IMAGE, "Still Image" },
 990     { USB_CLASS_CSCID, "Smart Card" },
 991     { USB_CLASS_CONTENT_SEC, "Content Security" },
 992     { -1, NULL }
 993 };
 994
 995 static const char *usb_class_str(uint8_t class)
 996 {
 997     const struct usb_class_info *p;
 998     for(p = usb_class_info; p->class != -1; p++) {
 999         if (p->class == class)
1000             break;
1001     }
1002     return p->class_name;
1003 }
1004
1005 static void usb_info_device(int bus_num, int addr, int class_id,
1006                             int vendor_id, int product_id,
1007                             const char *product_name,
1008                             int speed)
1009 {
1010     const char *class_str, *speed_str;
1011
1012     switch(speed) {
1013     case USB_SPEED_LOW:
1014         speed_str = "1.5";
1015         break;
1016     case USB_SPEED_FULL:
1017         speed_str = "12";
1018         break;
1019     case USB_SPEED_HIGH:
1020         speed_str = "480";
1021         break;
1022     default:
1023         speed_str = "?";
1024         break;
1025     }
1026
1027     term_printf("  Device %d.%d, speed %s Mb/s\n",
1028                 bus_num, addr, speed_str);
1029     class_str = usb_class_str(class_id);
1030     if (class_str)
1031         term_printf("    %s:", class_str);
1032     else
1033         term_printf("    Class %02x:", class_id);
1034     term_printf(" USB device %04x:%04x", vendor_id, product_id);
1035     if (product_name[0] != '\0')
1036         term_printf(", %s", product_name);
1037     term_printf("\n");
1038 }
1039
1040 static int usb_host_info_device(void *opaque, int bus_num, int addr,
1041                                 int class_id,
1042                                 int vendor_id, int product_id,
1043                                 const char *product_name,
1044                                 int speed)
1045 {
1046     usb_info_device(bus_num, addr, class_id, vendor_id, product_id,
1047                     product_name, speed);
1048     return 0;
1049 }
1050
1051 void usb_host_info(void)
1052 {
1053     usb_host_scan(NULL, usb_host_info_device);
1054 }
1055
1056 #else
1057
1058 void usb_host_info(void)
1059 {
1060     term_printf("USB host devices not supported\n");
1061 }
1062
1063 /* XXX: modify configure to compile the right host driver */
1064 USBDevice *usb_host_device_open(const char *devname)
1065 {
1066     return NULL;
1067 }
1068
1069 #endif