sys/bus/usb/usbdi.c

   1 /*      $NetBSD: usbdi.c,v 1.106 2004/10/24 12:52:40 augustss Exp $     */
   2 /*      $FreeBSD: src/sys/dev/usb/usbdi.c,v 1.91.2.1 2005/12/15 00:36:00 iedowse Exp $  */
   3 /*      $DragonFly: src/sys/bus/usb/usbdi.c,v 1.14 2006/12/22 23:12:17 swildner Exp $   */
   4
   5 /*
   6  * Copyright (c) 1998 The NetBSD Foundation, Inc.
   7  * All rights reserved.
   8  *
   9  * This code is derived from software contributed to The NetBSD Foundation
  10  * by Lennart Augustsson (lennart@augustsson.net) at
  11  * Carlstedt Research & Technology.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *        This product includes software developed by the NetBSD
  24  *        Foundation, Inc. and its contributors.
  25  * 4. Neither the name of The NetBSD Foundation nor the names of its
  26  *    contributors may be used to endorse or promote products derived
  27  *    from this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  30  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  31  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  32  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  33  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  34  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  35  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  36  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  37  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  39  * POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #if defined(__NetBSD__) || defined(__OpenBSD__)
  45 #include <sys/kernel.h>
  46 #include <sys/device.h>
  47 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  48 #include <sys/module.h>
  49 #include <sys/bus.h>
  50 #include "usb_if.h"
  51 #if defined(DIAGNOSTIC) && defined(__i386__)
  52 #include <machine/cpu.h>
  53 #endif
  54 #endif
  55 #include <sys/malloc.h>
  56 #include <sys/proc.h>
  57 #ifdef __DragonFly__
  58 #include <sys/thread2.h>
  59 #endif
  60
  61 #include <bus/usb/usb.h>
  62 #include <bus/usb/usbdi.h>
  63 #include <bus/usb/usbdi_util.h>
  64 #include <bus/usb/usbdivar.h>
  65 #include <bus/usb/usb_mem.h>
  66 #include <bus/usb/usb_quirks.h>
  67
  68 #if defined(__FreeBSD__) || defined(__DragonFly__)
  69 #define delay(d)        DELAY(d)
  70 #endif
  71
  72 #ifdef USB_DEBUG
  73 #define DPRINTF(x)      if (usbdebug) logprintf x
  74 #define DPRINTFN(n,x)   if (usbdebug>(n)) logprintf x
  75 extern int usbdebug;
  76 #else
  77 #define DPRINTF(x)
  78 #define DPRINTFN(n,x)
  79 #endif
  80
  81 Static usbd_status usbd_ar_pipe(usbd_pipe_handle pipe);
  82 Static void usbd_do_request_async_cb
  83         (usbd_xfer_handle, usbd_private_handle, usbd_status);
  84 Static void usbd_start_next(usbd_pipe_handle pipe);
  85 Static usbd_status usbd_open_pipe_ival
  86         (usbd_interface_handle, u_int8_t, u_int8_t, usbd_pipe_handle *, int);
  87 Static int usbd_xfer_isread(usbd_xfer_handle xfer);
  88
  89 Static int usbd_nbuses = 0;
  90
  91 void
  92 usbd_init(void)
  93 {
  94         usbd_nbuses++;
  95 }
  96
  97 void
  98 usbd_finish(void)
  99 {
 100         --usbd_nbuses;
 101 }
 102
 103 static __inline int
 104 usbd_xfer_isread(usbd_xfer_handle xfer)
 105 {
 106         if (xfer->rqflags & URQ_REQUEST)
 107                 return (xfer->request.bmRequestType & UT_READ);
 108         else
 109                 return (xfer->pipe->endpoint->edesc->bEndpointAddress &
 110                         UE_DIR_IN);
 111 }
 112
 113 #ifdef USB_DEBUG
 114 void
 115 usbd_dump_iface(struct usbd_interface *iface)
 116 {
 117         kprintf("usbd_dump_iface: iface=%p\n", iface);
 118         if (iface == NULL)
 119                 return;
 120         kprintf(" device=%p idesc=%p index=%d altindex=%d priv=%p\n",
 121                iface->device, iface->idesc, iface->index, iface->altindex,
 122                iface->priv);
 123 }
 124
 125 void
 126 usbd_dump_device(struct usbd_device *dev)
 127 {
 128         kprintf("usbd_dump_device: dev=%p\n", dev);
 129         if (dev == NULL)
 130                 return;
 131         kprintf(" bus=%p default_pipe=%p\n", dev->bus, dev->default_pipe);
 132         kprintf(" address=%d config=%d depth=%d speed=%d self_powered=%d "
 133                "power=%d langid=%d\n",
 134                dev->address, dev->config, dev->depth, dev->speed,
 135                dev->self_powered, dev->power, dev->langid);
 136 }
 137
 138 void
 139 usbd_dump_endpoint(struct usbd_endpoint *endp)
 140 {
 141         kprintf("usbd_dump_endpoint: endp=%p\n", endp);
 142         if (endp == NULL)
 143                 return;
 144         kprintf(" edesc=%p refcnt=%d\n", endp->edesc, endp->refcnt);
 145         if (endp->edesc)
 146                 kprintf(" bEndpointAddress=0x%02x\n",
 147                        endp->edesc->bEndpointAddress);
 148 }
 149
 150 void
 151 usbd_dump_queue(usbd_pipe_handle pipe)
 152 {
 153         usbd_xfer_handle xfer;
 154
 155         kprintf("usbd_dump_queue: pipe=%p\n", pipe);
 156         SIMPLEQ_FOREACH(xfer, &pipe->queue, next) {
 157                 kprintf("  xfer=%p\n", xfer);
 158         }
 159 }
 160
 161 void
 162 usbd_dump_pipe(usbd_pipe_handle pipe)
 163 {
 164         kprintf("usbd_dump_pipe: pipe=%p\n", pipe);
 165         if (pipe == NULL)
 166                 return;
 167         usbd_dump_iface(pipe->iface);
 168         usbd_dump_device(pipe->device);
 169         usbd_dump_endpoint(pipe->endpoint);
 170         kprintf(" (usbd_dump_pipe:)\n refcnt=%d running=%d aborting=%d\n",
 171                pipe->refcnt, pipe->running, pipe->aborting);
 172         kprintf(" intrxfer=%p, repeat=%d, interval=%d\n",
 173                pipe->intrxfer, pipe->repeat, pipe->interval);
 174 }
 175 #endif
 176
 177 usbd_status
 178 usbd_open_pipe(usbd_interface_handle iface, u_int8_t address,
 179                u_int8_t flags, usbd_pipe_handle *pipe)
 180 {
 181         return (usbd_open_pipe_ival(iface, address, flags, pipe,
 182                                     USBD_DEFAULT_INTERVAL));
 183 }
 184
 185 usbd_status
 186 usbd_open_pipe_ival(usbd_interface_handle iface, u_int8_t address,
 187                     u_int8_t flags, usbd_pipe_handle *pipe, int ival)
 188 {
 189         usbd_pipe_handle p;
 190         struct usbd_endpoint *ep;
 191         usbd_status err;
 192         int i;
 193
 194         DPRINTFN(3,("usbd_open_pipe: iface=%p address=0x%x flags=0x%x\n",
 195                     iface, address, flags));
 196
 197         for (i = 0; i < iface->idesc->bNumEndpoints; i++) {
 198                 ep = &iface->endpoints[i];
 199                 if (ep->edesc == NULL)
 200                         return (USBD_IOERROR);
 201                 if (ep->edesc->bEndpointAddress == address)
 202                         goto found;
 203         }
 204         return (USBD_BAD_ADDRESS);
 205  found:
 206         if ((flags & USBD_EXCLUSIVE_USE) && ep->refcnt != 0)
 207                 return (USBD_IN_USE);
 208         err = usbd_setup_pipe(iface->device, iface, ep, ival, &p);
 209         if (err)
 210                 return (err);
 211         LIST_INSERT_HEAD(&iface->pipes, p, next);
 212         *pipe = p;
 213         return (USBD_NORMAL_COMPLETION);
 214 }
 215
 216 usbd_status
 217 usbd_open_pipe_intr(usbd_interface_handle iface, u_int8_t address,
 218                     u_int8_t flags, usbd_pipe_handle *pipe,
 219                     usbd_private_handle priv, void *buffer, u_int32_t len,
 220                     usbd_callback cb, int ival)
 221 {
 222         usbd_status err;
 223         usbd_xfer_handle xfer;
 224         usbd_pipe_handle ipipe;
 225
 226         DPRINTFN(3,("usbd_open_pipe_intr: address=0x%x flags=0x%x len=%d\n",
 227                     address, flags, len));
 228
 229         err = usbd_open_pipe_ival(iface, address, USBD_EXCLUSIVE_USE,
 230                                   &ipipe, ival);
 231         if (err)
 232                 return (err);
 233         xfer = usbd_alloc_xfer(iface->device);
 234         if (xfer == NULL) {
 235                 err = USBD_NOMEM;
 236                 goto bad1;
 237         }
 238         usbd_setup_xfer(xfer, ipipe, priv, buffer, len, flags,
 239             USBD_NO_TIMEOUT, cb);
 240         ipipe->intrxfer = xfer;
 241         ipipe->repeat = 1;
 242         err = usbd_transfer(xfer);
 243         *pipe = ipipe;
 244         if (err != USBD_IN_PROGRESS && err)
 245                 goto bad2;
 246         return (USBD_NORMAL_COMPLETION);
 247
 248  bad2:
 249         ipipe->intrxfer = NULL;
 250         ipipe->repeat = 0;
 251         usbd_free_xfer(xfer);
 252  bad1:
 253         usbd_close_pipe(ipipe);
 254         return (err);
 255 }
 256
 257 usbd_status
 258 usbd_close_pipe(usbd_pipe_handle pipe)
 259 {
 260 #ifdef DIAGNOSTIC
 261         if (pipe == NULL) {
 262                 kprintf("usbd_close_pipe: pipe==NULL\n");
 263                 return (USBD_NORMAL_COMPLETION);
 264         }
 265 #endif
 266
 267         if (--pipe->refcnt != 0)
 268                 return (USBD_NORMAL_COMPLETION);
 269         if (! SIMPLEQ_EMPTY(&pipe->queue))
 270                 return (USBD_PENDING_REQUESTS);
 271         LIST_REMOVE(pipe, next);
 272         pipe->endpoint->refcnt--;
 273         pipe->methods->close(pipe);
 274         if (pipe->intrxfer != NULL)
 275                 usbd_free_xfer(pipe->intrxfer);
 276         kfree(pipe, M_USB);
 277         return (USBD_NORMAL_COMPLETION);
 278 }
 279
 280 usbd_status
 281 usbd_transfer(usbd_xfer_handle xfer)
 282 {
 283         usbd_pipe_handle pipe = xfer->pipe;
 284         usb_dma_t *dmap = &xfer->dmabuf;
 285         usbd_status err;
 286         u_int size;
 287
 288         DPRINTFN(5,("usbd_transfer: xfer=%p, flags=%d, pipe=%p, running=%d\n",
 289                     xfer, xfer->flags, pipe, pipe->running));
 290 #ifdef USB_DEBUG
 291         if (usbdebug > 5)
 292                 usbd_dump_queue(pipe);
 293 #endif
 294         xfer->done = 0;
 295
 296         if (pipe->aborting)
 297                 return (USBD_CANCELLED);
 298
 299         size = xfer->length;
 300         /* If there is no buffer, allocate one. */
 301         if (!(xfer->rqflags & URQ_DEV_DMABUF) && size != 0) {
 302                 struct usbd_bus *bus = pipe->device->bus;
 303
 304 #ifdef DIAGNOSTIC
 305                 if (xfer->rqflags & URQ_AUTO_DMABUF)
 306                         kprintf("usbd_transfer: has old buffer!\n");
 307 #endif
 308                 err = bus->methods->allocm(bus, dmap, size);
 309                 if (err)
 310                         return (err);
 311                 xfer->rqflags |= URQ_AUTO_DMABUF;
 312         }
 313
 314         /* Copy data if going out. */
 315         if (!(xfer->flags & USBD_NO_COPY) && size != 0 &&
 316             !usbd_xfer_isread(xfer))
 317                 memcpy(KERNADDR(dmap, 0), xfer->buffer, size);
 318
 319         err = pipe->methods->transfer(xfer);
 320
 321         if (err != USBD_IN_PROGRESS && err) {
 322                 /* The transfer has not been queued, so free buffer. */
 323                 if (xfer->rqflags & URQ_AUTO_DMABUF) {
 324                         struct usbd_bus *bus = pipe->device->bus;
 325
 326                         bus->methods->freem(bus, &xfer->dmabuf);
 327                         xfer->rqflags &= ~URQ_AUTO_DMABUF;
 328                 }
 329         }
 330
 331         if (!(xfer->flags & USBD_SYNCHRONOUS))
 332                 return (err);
 333
 334         /* Sync transfer, wait for completion. */
 335         if (err != USBD_IN_PROGRESS)
 336                 return (err);
 337         crit_enter();
 338         if (!xfer->done) {
 339                 if (pipe->device->bus->use_polling)
 340                         panic("usbd_transfer: not done");
 341                 tsleep(xfer, 0, "usbsyn", 0);
 342         }
 343         crit_exit();
 344         return (xfer->status);
 345 }
 346
 347 /* Like usbd_transfer(), but waits for completion. */
 348 usbd_status
 349 usbd_sync_transfer(usbd_xfer_handle xfer)
 350 {
 351         xfer->flags |= USBD_SYNCHRONOUS;
 352         return (usbd_transfer(xfer));
 353 }
 354
 355 void *
 356 usbd_alloc_buffer(usbd_xfer_handle xfer, u_int32_t size)
 357 {
 358         struct usbd_bus *bus = xfer->device->bus;
 359         usbd_status err;
 360
 361 #ifdef DIAGNOSTIC
 362         if (xfer->rqflags & (URQ_DEV_DMABUF | URQ_AUTO_DMABUF))
 363                 kprintf("usbd_alloc_buffer: xfer already has a buffer\n");
 364 #endif
 365         err = bus->methods->allocm(bus, &xfer->dmabuf, size);
 366         if (err)
 367                 return (NULL);
 368         xfer->rqflags |= URQ_DEV_DMABUF;
 369         return (KERNADDR(&xfer->dmabuf, 0));
 370 }
 371
 372 void
 373 usbd_free_buffer(usbd_xfer_handle xfer)
 374 {
 375 #ifdef DIAGNOSTIC
 376         if (!(xfer->rqflags & (URQ_DEV_DMABUF | URQ_AUTO_DMABUF))) {
 377                 kprintf("usbd_free_buffer: no buffer\n");
 378                 return;
 379         }
 380 #endif
 381         xfer->rqflags &= ~(URQ_DEV_DMABUF | URQ_AUTO_DMABUF);
 382         xfer->device->bus->methods->freem(xfer->device->bus, &xfer->dmabuf);
 383 }
 384
 385 void *
 386 usbd_get_buffer(usbd_xfer_handle xfer)
 387 {
 388         if (!(xfer->rqflags & URQ_DEV_DMABUF))
 389                 return (0);
 390         return (KERNADDR(&xfer->dmabuf, 0));
 391 }
 392
 393 usbd_xfer_handle
 394 usbd_alloc_xfer(usbd_device_handle dev)
 395 {
 396         usbd_xfer_handle xfer;
 397
 398         xfer = dev->bus->methods->allocx(dev->bus);
 399         if (xfer == NULL)
 400                 return (NULL);
 401         xfer->device = dev;
 402         usb_callout_init(xfer->timeout_handle);
 403         DPRINTFN(5,("usbd_alloc_xfer() = %p\n", xfer));
 404         return (xfer);
 405 }
 406
 407 usbd_status
 408 usbd_free_xfer(usbd_xfer_handle xfer)
 409 {
 410         DPRINTFN(5,("usbd_free_xfer: %p\n", xfer));
 411         if (xfer->rqflags & (URQ_DEV_DMABUF | URQ_AUTO_DMABUF))
 412                 usbd_free_buffer(xfer);
 413 #if defined(__NetBSD__) && defined(DIAGNOSTIC)
 414         if (callout_pending(&xfer->timeout_handle)) {
 415                 callout_stop(&xfer->timeout_handle);
 416                 kprintf("usbd_free_xfer: timout_handle pending");
 417         }
 418 #endif
 419         xfer->device->bus->methods->freex(xfer->device->bus, xfer);
 420         return (USBD_NORMAL_COMPLETION);
 421 }
 422
 423 void
 424 usbd_setup_xfer(usbd_xfer_handle xfer, usbd_pipe_handle pipe,
 425                 usbd_private_handle priv, void *buffer, u_int32_t length,
 426                 u_int16_t flags, u_int32_t timeout,
 427                 usbd_callback callback)
 428 {
 429         xfer->pipe = pipe;
 430         xfer->priv = priv;
 431         xfer->buffer = buffer;
 432         xfer->length = length;
 433         xfer->actlen = 0;
 434         xfer->flags = flags;
 435         xfer->timeout = timeout;
 436         xfer->status = USBD_NOT_STARTED;
 437         xfer->callback = callback;
 438         xfer->rqflags &= ~URQ_REQUEST;
 439         xfer->nframes = 0;
 440 }
 441
 442 void
 443 usbd_setup_default_xfer(usbd_xfer_handle xfer, usbd_device_handle dev,
 444                         usbd_private_handle priv, u_int32_t timeout,
 445                         usb_device_request_t *req, void *buffer,
 446                         u_int32_t length, u_int16_t flags,
 447                         usbd_callback callback)
 448 {
 449         xfer->pipe = dev->default_pipe;
 450         xfer->priv = priv;
 451         xfer->buffer = buffer;
 452         xfer->length = length;
 453         xfer->actlen = 0;
 454         xfer->flags = flags;
 455         xfer->timeout = timeout;
 456         xfer->status = USBD_NOT_STARTED;
 457         xfer->callback = callback;
 458         xfer->request = *req;
 459         xfer->rqflags |= URQ_REQUEST;
 460         xfer->nframes = 0;
 461 }
 462
 463 void
 464 usbd_setup_isoc_xfer(usbd_xfer_handle xfer, usbd_pipe_handle pipe,
 465                      usbd_private_handle priv, u_int16_t *frlengths,
 466                      u_int32_t nframes, u_int16_t flags, usbd_callback callback)
 467 {
 468         xfer->pipe = pipe;
 469         xfer->priv = priv;
 470         xfer->buffer = 0;
 471         xfer->length = 0;
 472         xfer->actlen = 0;
 473         xfer->flags = flags;
 474         xfer->timeout = USBD_NO_TIMEOUT;
 475         xfer->status = USBD_NOT_STARTED;
 476         xfer->callback = callback;
 477         xfer->rqflags &= ~URQ_REQUEST;
 478         xfer->frlengths = frlengths;
 479         xfer->nframes = nframes;
 480 }
 481
 482 void
 483 usbd_get_xfer_status(usbd_xfer_handle xfer, usbd_private_handle *priv,
 484                      void **buffer, u_int32_t *count, usbd_status *status)
 485 {
 486         if (priv != NULL)
 487                 *priv = xfer->priv;
 488         if (buffer != NULL)
 489                 *buffer = xfer->buffer;
 490         if (count != NULL)
 491                 *count = xfer->actlen;
 492         if (status != NULL)
 493                 *status = xfer->status;
 494 }
 495
 496 int
 497 usbd_get_speed(usbd_device_handle dev)
 498 {
 499         return(dev->speed);
 500 }
 501
 502 usb_config_descriptor_t *
 503 usbd_get_config_descriptor(usbd_device_handle dev)
 504 {
 505 #ifdef DIAGNOSTIC
 506         if (dev == NULL) {
 507                 kprintf("usbd_get_config_descriptor: dev == NULL\n");
 508                 return (NULL);
 509         }
 510 #endif
 511         return (dev->cdesc);
 512 }
 513
 514 usb_interface_descriptor_t *
 515 usbd_get_interface_descriptor(usbd_interface_handle iface)
 516 {
 517 #ifdef DIAGNOSTIC
 518         if (iface == NULL) {
 519                 kprintf("usbd_get_interface_descriptor: dev == NULL\n");
 520                 return (NULL);
 521         }
 522 #endif
 523         return (iface->idesc);
 524 }
 525
 526 usb_device_descriptor_t *
 527 usbd_get_device_descriptor(usbd_device_handle dev)
 528 {
 529         return (&dev->ddesc);
 530 }
 531
 532 usb_endpoint_descriptor_t *
 533 usbd_interface2endpoint_descriptor(usbd_interface_handle iface, u_int8_t index)
 534 {
 535         if (index >= iface->idesc->bNumEndpoints)
 536                 return (0);
 537         return (iface->endpoints[index].edesc);
 538 }
 539
 540 usbd_status
 541 usbd_abort_pipe(usbd_pipe_handle pipe)
 542 {
 543         usbd_status err;
 544
 545 #ifdef DIAGNOSTIC
 546         if (pipe == NULL) {
 547                 kprintf("usbd_close_pipe: pipe==NULL\n");
 548                 return (USBD_NORMAL_COMPLETION);
 549         }
 550 #endif
 551         crit_enter();
 552         err = usbd_ar_pipe(pipe);
 553         crit_exit();
 554         return (err);
 555 }
 556
 557 usbd_status
 558 usbd_abort_default_pipe(usbd_device_handle dev)
 559 {
 560         return (usbd_abort_pipe(dev->default_pipe));
 561 }
 562
 563 usbd_status
 564 usbd_clear_endpoint_stall(usbd_pipe_handle pipe)
 565 {
 566         usbd_device_handle dev = pipe->device;
 567         usb_device_request_t req;
 568         usbd_status err;
 569
 570         DPRINTFN(8, ("usbd_clear_endpoint_stall\n"));
 571
 572         /*
 573          * Clearing en endpoint stall resets the endpoint toggle, so
 574          * do the same to the HC toggle.
 575          */
 576         pipe->methods->cleartoggle(pipe);
 577
 578         req.bmRequestType = UT_WRITE_ENDPOINT;
 579         req.bRequest = UR_CLEAR_FEATURE;
 580         USETW(req.wValue, UF_ENDPOINT_HALT);
 581         USETW(req.wIndex, pipe->endpoint->edesc->bEndpointAddress);
 582         USETW(req.wLength, 0);
 583         err = usbd_do_request(dev, &req, 0);
 584 #if 0
 585 XXX should we do this?
 586         if (!err) {
 587                 pipe->state = USBD_PIPE_ACTIVE;
 588                 /* XXX activate pipe */
 589         }
 590 #endif
 591         return (err);
 592 }
 593
 594 usbd_status
 595 usbd_clear_endpoint_stall_async(usbd_pipe_handle pipe)
 596 {
 597         usbd_device_handle dev = pipe->device;
 598         usb_device_request_t req;
 599         usbd_status err;
 600
 601         pipe->methods->cleartoggle(pipe);
 602
 603         req.bmRequestType = UT_WRITE_ENDPOINT;
 604         req.bRequest = UR_CLEAR_FEATURE;
 605         USETW(req.wValue, UF_ENDPOINT_HALT);
 606         USETW(req.wIndex, pipe->endpoint->edesc->bEndpointAddress);
 607         USETW(req.wLength, 0);
 608         err = usbd_do_request_async(dev, &req, 0);
 609         return (err);
 610 }
 611
 612 void
 613 usbd_clear_endpoint_toggle(usbd_pipe_handle pipe)
 614 {
 615         pipe->methods->cleartoggle(pipe);
 616 }
 617
 618 usbd_status
 619 usbd_endpoint_count(usbd_interface_handle iface, u_int8_t *count)
 620 {
 621 #ifdef DIAGNOSTIC
 622         if (iface == NULL || iface->idesc == NULL) {
 623                 kprintf("usbd_endpoint_count: NULL pointer\n");
 624                 return (USBD_INVAL);
 625         }
 626 #endif
 627         *count = iface->idesc->bNumEndpoints;
 628         return (USBD_NORMAL_COMPLETION);
 629 }
 630
 631 usbd_status
 632 usbd_interface_count(usbd_device_handle dev, u_int8_t *count)
 633 {
 634         if (dev->cdesc == NULL)
 635                 return (USBD_NOT_CONFIGURED);
 636         *count = dev->cdesc->bNumInterface;
 637         return (USBD_NORMAL_COMPLETION);
 638 }
 639
 640 void
 641 usbd_interface2device_handle(usbd_interface_handle iface,
 642                              usbd_device_handle *dev)
 643 {
 644         *dev = iface->device;
 645 }
 646
 647 usbd_status
 648 usbd_device2interface_handle(usbd_device_handle dev,
 649                              u_int8_t ifaceno, usbd_interface_handle *iface)
 650 {
 651         if (dev->cdesc == NULL)
 652                 return (USBD_NOT_CONFIGURED);
 653         if (ifaceno >= dev->cdesc->bNumInterface)
 654                 return (USBD_INVAL);
 655         *iface = &dev->ifaces[ifaceno];
 656         return (USBD_NORMAL_COMPLETION);
 657 }
 658
 659 usbd_device_handle
 660 usbd_pipe2device_handle(usbd_pipe_handle pipe)
 661 {
 662         return (pipe->device);
 663 }
 664
 665 /* XXXX use altno */
 666 usbd_status
 667 usbd_set_interface(usbd_interface_handle iface, int altidx)
 668 {
 669         usb_device_request_t req;
 670         usbd_status err;
 671         void *endpoints;
 672
 673         if (LIST_FIRST(&iface->pipes) != 0)
 674                 return (USBD_IN_USE);
 675
 676         endpoints = iface->endpoints;
 677         err = usbd_fill_iface_data(iface->device, iface->index, altidx);
 678         if (err)
 679                 return (err);
 680
 681         /* new setting works, we can free old endpoints */
 682         if (endpoints != NULL)
 683                 kfree(endpoints, M_USB);
 684
 685 #ifdef DIAGNOSTIC
 686         if (iface->idesc == NULL) {
 687                 kprintf("usbd_set_interface: NULL pointer\n");
 688                 return (USBD_INVAL);
 689         }
 690 #endif
 691
 692         req.bmRequestType = UT_WRITE_INTERFACE;
 693         req.bRequest = UR_SET_INTERFACE;
 694         USETW(req.wValue, iface->idesc->bAlternateSetting);
 695         USETW(req.wIndex, iface->idesc->bInterfaceNumber);
 696         USETW(req.wLength, 0);
 697         return (usbd_do_request(iface->device, &req, 0));
 698 }
 699
 700 int
 701 usbd_get_no_alts(usb_config_descriptor_t *cdesc, int ifaceno)
 702 {
 703         char *p = (char *)cdesc;
 704         char *end = p + UGETW(cdesc->wTotalLength);
 705         usb_interface_descriptor_t *d;
 706         int n;
 707
 708         for (n = 0; p < end; p += d->bLength) {
 709                 d = (usb_interface_descriptor_t *)p;
 710                 if (p + d->bLength <= end &&
 711                     d->bDescriptorType == UDESC_INTERFACE &&
 712                     d->bInterfaceNumber == ifaceno)
 713                         n++;
 714         }
 715         return (n);
 716 }
 717
 718 int
 719 usbd_get_interface_altindex(usbd_interface_handle iface)
 720 {
 721         return (iface->altindex);
 722 }
 723
 724 usbd_status
 725 usbd_get_interface(usbd_interface_handle iface, u_int8_t *aiface)
 726 {
 727         usb_device_request_t req;
 728
 729         req.bmRequestType = UT_READ_INTERFACE;
 730         req.bRequest = UR_GET_INTERFACE;
 731         USETW(req.wValue, 0);
 732         USETW(req.wIndex, iface->idesc->bInterfaceNumber);
 733         USETW(req.wLength, 1);
 734         return (usbd_do_request(iface->device, &req, aiface));
 735 }
 736
 737 /*** Internal routines ***/
 738
 739 /* Dequeue all pipe operations, called from critical section. */
 740 Static usbd_status
 741 usbd_ar_pipe(usbd_pipe_handle pipe)
 742 {
 743         usbd_xfer_handle xfer;
 744
 745         DPRINTFN(2,("usbd_ar_pipe: pipe=%p\n", pipe));
 746 #ifdef USB_DEBUG
 747         if (usbdebug > 5)
 748                 usbd_dump_queue(pipe);
 749 #endif
 750         pipe->repeat = 0;
 751         pipe->aborting = 1;
 752         while ((xfer = SIMPLEQ_FIRST(&pipe->queue)) != NULL) {
 753                 DPRINTFN(2,("usbd_ar_pipe: pipe=%p xfer=%p (methods=%p)\n",
 754                             pipe, xfer, pipe->methods));
 755                 /* Make the HC abort it (and invoke the callback). */
 756                 pipe->methods->abort(xfer);
 757                 /* XXX only for non-0 usbd_clear_endpoint_stall(pipe); */
 758         }
 759         pipe->aborting = 0;
 760         return (USBD_NORMAL_COMPLETION);
 761 }
 762
 763 /* Called from critical section */
 764 void
 765 usb_transfer_complete(usbd_xfer_handle xfer)
 766 {
 767         usbd_pipe_handle pipe = xfer->pipe;
 768         usb_dma_t *dmap = &xfer->dmabuf;
 769         int sync = xfer->flags & USBD_SYNCHRONOUS;
 770         int erred = xfer->status == USBD_CANCELLED ||
 771             xfer->status == USBD_TIMEOUT;
 772         int repeat = pipe->repeat;
 773         int polling;
 774
 775         DPRINTFN(5, ("usb_transfer_complete: pipe=%p xfer=%p status=%d "
 776                      "actlen=%d\n", pipe, xfer, xfer->status, xfer->actlen));
 777 #ifdef DIAGNOSTIC
 778         if (xfer->busy_free != XFER_ONQU) {
 779                 kprintf("usb_transfer_complete: xfer=%p not busy 0x%08x\n",
 780                        xfer, xfer->busy_free);
 781                 return;
 782         }
 783 #endif
 784
 785 #ifdef DIAGNOSTIC
 786         if (pipe == NULL) {
 787                 kprintf("usbd_transfer_cb: pipe==0, xfer=%p\n", xfer);
 788                 return;
 789         }
 790 #endif
 791         polling = pipe->device->bus->use_polling;
 792         /* XXXX */
 793         if (polling)
 794                 pipe->running = 0;
 795
 796         if (!(xfer->flags & USBD_NO_COPY) && xfer->actlen != 0 &&
 797             usbd_xfer_isread(xfer)) {
 798 #ifdef DIAGNOSTIC
 799                 if (xfer->actlen > xfer->length) {
 800                         kprintf("usb_transfer_complete: actlen > len %d > %d\n",
 801                                xfer->actlen, xfer->length);
 802                         xfer->actlen = xfer->length;
 803                 }
 804 #endif
 805                 memcpy(xfer->buffer, KERNADDR(dmap, 0), xfer->actlen);
 806         }
 807
 808         /* if we allocated the buffer in usbd_transfer() we free it here. */
 809         if (xfer->rqflags & URQ_AUTO_DMABUF) {
 810                 if (!repeat) {
 811                         struct usbd_bus *bus = pipe->device->bus;
 812                         bus->methods->freem(bus, dmap);
 813                         xfer->rqflags &= ~URQ_AUTO_DMABUF;
 814                 }
 815         }
 816
 817         if (!repeat) {
 818                 /* Remove request from queue. */
 819 #ifdef DIAGNOSTIC
 820                 if (xfer != SIMPLEQ_FIRST(&pipe->queue))
 821                         kprintf("usb_transfer_complete: bad dequeue %p != %p\n",
 822                                xfer, SIMPLEQ_FIRST(&pipe->queue));
 823                 xfer->busy_free = XFER_BUSY;
 824 #endif
 825                 SIMPLEQ_REMOVE_HEAD(&pipe->queue, next);
 826         }
 827         DPRINTFN(5,("usb_transfer_complete: repeat=%d new head=%p\n",
 828                     repeat, SIMPLEQ_FIRST(&pipe->queue)));
 829
 830         /* Count completed transfers. */
 831         ++pipe->device->bus->stats.uds_requests
 832                 [pipe->endpoint->edesc->bmAttributes & UE_XFERTYPE];
 833
 834         xfer->done = 1;
 835         if (!xfer->status && xfer->actlen < xfer->length &&
 836             !(xfer->flags & USBD_SHORT_XFER_OK)) {
 837                 DPRINTFN(-1,("usbd_transfer_cb: short transfer %d<%d\n",
 838                              xfer->actlen, xfer->length));
 839                 xfer->status = USBD_SHORT_XFER;
 840         }
 841
 842         /*
 843          * For repeat operations, call the callback first, as the xfer
 844          * will not go away and the "done" method may modify it. Otherwise
 845          * reverse the order in case the callback wants to free or reuse
 846          * the xfer.
 847          */
 848         if (repeat) {
 849                 if (xfer->callback)
 850                         xfer->callback(xfer, xfer->priv, xfer->status);
 851                 pipe->methods->done(xfer);
 852         } else {
 853                 pipe->methods->done(xfer);
 854                 if (xfer->callback)
 855                         xfer->callback(xfer, xfer->priv, xfer->status);
 856         }
 857
 858         if (sync && !polling)
 859                 wakeup(xfer);
 860
 861         if (!repeat) {
 862                 /* XXX should we stop the queue on all errors? */
 863                 if (erred && pipe->iface != NULL)       /* not control pipe */
 864                         pipe->running = 0;
 865                 else
 866                         usbd_start_next(pipe);
 867         }
 868 }
 869
 870 usbd_status
 871 usb_insert_transfer(usbd_xfer_handle xfer)
 872 {
 873         usbd_pipe_handle pipe = xfer->pipe;
 874         usbd_status err;
 875
 876         DPRINTFN(5,("usb_insert_transfer: pipe=%p running=%d timeout=%d\n",
 877                     pipe, pipe->running, xfer->timeout));
 878 #ifdef DIAGNOSTIC
 879         if (xfer->busy_free != XFER_BUSY) {
 880                 kprintf("usb_insert_transfer: xfer=%p not busy 0x%08x\n",
 881                        xfer, xfer->busy_free);
 882                 return (USBD_INVAL);
 883         }
 884         xfer->busy_free = XFER_ONQU;
 885 #endif
 886         crit_enter();
 887         SIMPLEQ_INSERT_TAIL(&pipe->queue, xfer, next);
 888         if (pipe->running)
 889                 err = USBD_IN_PROGRESS;
 890         else {
 891                 pipe->running = 1;
 892                 err = USBD_NORMAL_COMPLETION;
 893         }
 894         crit_exit();
 895         return (err);
 896 }
 897
 898 /* Called from critical section */
 899 void
 900 usbd_start_next(usbd_pipe_handle pipe)
 901 {
 902         usbd_xfer_handle xfer;
 903         usbd_status err;
 904
 905 #ifdef DIAGNOSTIC
 906         if (pipe == NULL) {
 907                 kprintf("usbd_start_next: pipe == NULL\n");
 908                 return;
 909         }
 910         if (pipe->methods == NULL || pipe->methods->start == NULL) {
 911                 kprintf("usbd_start_next: pipe=%p no start method\n", pipe);
 912                 return;
 913         }
 914 #endif
 915
 916         /* Get next request in queue. */
 917         xfer = SIMPLEQ_FIRST(&pipe->queue);
 918         DPRINTFN(5, ("usbd_start_next: pipe=%p, xfer=%p\n", pipe, xfer));
 919         if (xfer == NULL) {
 920                 pipe->running = 0;
 921         } else {
 922                 err = pipe->methods->start(xfer);
 923                 if (err != USBD_IN_PROGRESS) {
 924                         kprintf("usbd_start_next: error=%d\n", err);
 925                         pipe->running = 0;
 926                         /* XXX do what? */
 927                 }
 928         }
 929 }
 930
 931 usbd_status
 932 usbd_do_request(usbd_device_handle dev, usb_device_request_t *req, void *data)
 933 {
 934         return (usbd_do_request_flags(dev, req, data, 0, 0,
 935                                       USBD_DEFAULT_TIMEOUT));
 936 }
 937
 938 usbd_status
 939 usbd_do_request_flags(usbd_device_handle dev, usb_device_request_t *req,
 940                       void *data, u_int16_t flags, int *actlen, u_int32_t timo)
 941 {
 942         return (usbd_do_request_flags_pipe(dev, dev->default_pipe, req,
 943                                            data, flags, actlen, timo));
 944 }
 945
 946 usbd_status
 947 usbd_do_request_flags_pipe(usbd_device_handle dev, usbd_pipe_handle pipe,
 948         usb_device_request_t *req, void *data, u_int16_t flags, int *actlen,
 949         u_int32_t timeout)
 950 {
 951         usbd_xfer_handle xfer;
 952         usbd_status err;
 953
 954 #ifdef DIAGNOSTIC
 955 #if defined(__i386__) && (defined(__FreeBSD__) || defined(__DragonFly__))
 956 #if defined(__FreeBSD__)
 957         KASSERT(curthread->td_intr_nesting_level == 0,
 958                 ("usbd_do_request: in interrupt context"));
 959 #elif defined(__DragonFly__)
 960         KASSERT(mycpu->gd_intr_nesting_level == 0,
 961                 ("usbd_do_request: in interrupt context"));
 962 #endif
 963 #endif
 964         if (dev->bus->intr_context) {
 965                 kprintf("usbd_do_request: not in process context\n");
 966                 return (USBD_INVAL);
 967         }
 968 #endif
 969
 970         xfer = usbd_alloc_xfer(dev);
 971         if (xfer == NULL)
 972                 return (USBD_NOMEM);
 973         usbd_setup_default_xfer(xfer, dev, 0, timeout, req,
 974                                 data, UGETW(req->wLength), flags, 0);
 975         xfer->pipe = pipe;
 976         err = usbd_sync_transfer(xfer);
 977 #if defined(USB_DEBUG) || defined(DIAGNOSTIC)
 978         if (xfer->actlen > xfer->length)
 979                 DPRINTF(("usbd_do_request: overrun addr=%d type=0x%02x req=0x"
 980                          "%02x val=%d index=%d rlen=%d length=%d actlen=%d\n",
 981                          dev->address, xfer->request.bmRequestType,
 982                          xfer->request.bRequest, UGETW(xfer->request.wValue),
 983                          UGETW(xfer->request.wIndex),
 984                          UGETW(xfer->request.wLength),
 985                          xfer->length, xfer->actlen));
 986 #endif
 987         if (actlen != NULL)
 988                 *actlen = xfer->actlen;
 989         if (err == USBD_STALLED) {
 990                 /*
 991                  * The control endpoint has stalled.  Control endpoints
 992                  * should not halt, but some may do so anyway so clear
 993                  * any halt condition.
 994                  */
 995                 usb_device_request_t treq;
 996                 usb_status_t status;
 997                 u_int16_t s;
 998                 usbd_status nerr;
 999
1000                 treq.bmRequestType = UT_READ_ENDPOINT;
1001                 treq.bRequest = UR_GET_STATUS;
1002                 USETW(treq.wValue, 0);
1003                 USETW(treq.wIndex, 0);
1004                 USETW(treq.wLength, sizeof(usb_status_t));
1005                 usbd_setup_default_xfer(xfer, dev, 0, USBD_DEFAULT_TIMEOUT,
1006                                            &treq, &status,sizeof(usb_status_t),
1007                                            0, 0);
1008                 nerr = usbd_sync_transfer(xfer);
1009                 if (nerr)
1010                         goto bad;
1011                 s = UGETW(status.wStatus);
1012                 DPRINTF(("usbd_do_request: status = 0x%04x\n", s));
1013                 if (!(s & UES_HALT))
1014                         goto bad;
1015                 treq.bmRequestType = UT_WRITE_ENDPOINT;
1016                 treq.bRequest = UR_CLEAR_FEATURE;
1017                 USETW(treq.wValue, UF_ENDPOINT_HALT);
1018                 USETW(treq.wIndex, 0);
1019                 USETW(treq.wLength, 0);
1020                 usbd_setup_default_xfer(xfer, dev, 0, USBD_DEFAULT_TIMEOUT,
1021                                            &treq, &status, 0, 0, 0);
1022                 nerr = usbd_sync_transfer(xfer);
1023                 if (nerr)
1024                         goto bad;
1025         }
1026
1027  bad:
1028         usbd_free_xfer(xfer);
1029         return (err);
1030 }
1031
1032 void
1033 usbd_do_request_async_cb(usbd_xfer_handle xfer, usbd_private_handle priv,
1034                          usbd_status status)
1035 {
1036 #if defined(USB_DEBUG) || defined(DIAGNOSTIC)
1037         if (xfer->actlen > xfer->length)
1038                 DPRINTF(("usbd_do_request: overrun addr=%d type=0x%02x req=0x"
1039                          "%02x val=%d index=%d rlen=%d length=%d actlen=%d\n",
1040                          xfer->pipe->device->address,
1041                          xfer->request.bmRequestType,
1042                          xfer->request.bRequest, UGETW(xfer->request.wValue),
1043                          UGETW(xfer->request.wIndex),
1044                          UGETW(xfer->request.wLength),
1045                          xfer->length, xfer->actlen));
1046 #endif
1047         usbd_free_xfer(xfer);
1048 }
1049
1050 /*
1051  * Execute a request without waiting for completion.
1052  * Can be used from interrupt context.
1053  */
1054 usbd_status
1055 usbd_do_request_async(usbd_device_handle dev, usb_device_request_t *req,
1056                       void *data)
1057 {
1058         usbd_xfer_handle xfer;
1059         usbd_status err;
1060
1061         xfer = usbd_alloc_xfer(dev);
1062         if (xfer == NULL)
1063                 return (USBD_NOMEM);
1064         usbd_setup_default_xfer(xfer, dev, 0, USBD_DEFAULT_TIMEOUT, req,
1065             data, UGETW(req->wLength), 0, usbd_do_request_async_cb);
1066         err = usbd_transfer(xfer);
1067         if (err != USBD_IN_PROGRESS && err) {
1068                 usbd_free_xfer(xfer);
1069                 return (err);
1070         }
1071         return (USBD_NORMAL_COMPLETION);
1072 }
1073
1074 const struct usbd_quirks *
1075 usbd_get_quirks(usbd_device_handle dev)
1076 {
1077 #ifdef DIAGNOSTIC
1078         if (dev == NULL) {
1079                 kprintf("usbd_get_quirks: dev == NULL\n");
1080                 return 0;
1081         }
1082 #endif
1083         return (dev->quirks);
1084 }
1085
1086 /* XXX do periodic free() of free list */
1087
1088 /*
1089  * Called from keyboard driver when in polling mode.
1090  */
1091 void
1092 usbd_dopoll(usbd_interface_handle iface)
1093 {
1094         iface->device->bus->methods->do_poll(iface->device->bus);
1095 }
1096
1097 void
1098 usbd_set_polling(usbd_device_handle dev, int on)
1099 {
1100         if (on)
1101                 dev->bus->use_polling++;
1102         else
1103                 dev->bus->use_polling--;
1104         /* When polling we need to make sure there is nothing pending to do. */
1105         if (dev->bus->use_polling)
1106                 dev->bus->methods->soft_intr(dev->bus);
1107 }
1108
1109
1110 usb_endpoint_descriptor_t *
1111 usbd_get_endpoint_descriptor(usbd_interface_handle iface, u_int8_t address)
1112 {
1113         struct usbd_endpoint *ep;
1114         int i;
1115
1116         for (i = 0; i < iface->idesc->bNumEndpoints; i++) {
1117                 ep = &iface->endpoints[i];
1118                 if (ep->edesc->bEndpointAddress == address)
1119                         return (iface->endpoints[i].edesc);
1120         }
1121         return (0);
1122 }
1123
1124 /*
1125  * usbd_ratecheck() can limit the number of error messages that occurs.
1126  * When a device is unplugged it may take up to 0.25s for the hub driver
1127  * to notice it.  If the driver continuosly tries to do I/O operations
1128  * this can generate a large number of messages.
1129  */
1130 int
1131 usbd_ratecheck(struct timeval *last)
1132 {
1133         if (last->tv_sec == time_second)
1134                 return (0);
1135         last->tv_sec = time_second;
1136         return (1);
1137 }
1138
1139 /*
1140  * Search for a vendor/product pair in an array.  The item size is
1141  * given as an argument.
1142  */
1143 const struct usb_devno *
1144 usb_match_device(const struct usb_devno *tbl, u_int nentries, u_int sz,
1145                  u_int16_t vendor, u_int16_t product)
1146 {
1147         while (nentries-- > 0) {
1148                 u_int16_t tproduct = tbl->ud_product;
1149                 if (tbl->ud_vendor == vendor &&
1150                     (tproduct == product || tproduct == USB_PRODUCT_ANY))
1151                         return (tbl);
1152                 tbl = (const struct usb_devno *)((const char *)tbl + sz);
1153         }
1154         return (NULL);
1155 }
1156
1157
1158 void
1159 usb_desc_iter_init(usbd_device_handle dev, usbd_desc_iter_t *iter)
1160 {
1161         const usb_config_descriptor_t *cd = usbd_get_config_descriptor(dev);
1162
1163         iter->cur = (const uByte *)cd;
1164         iter->end = (const uByte *)cd + UGETW(cd->wTotalLength);
1165 }
1166
1167 const usb_descriptor_t *
1168 usb_desc_iter_next(usbd_desc_iter_t *iter)
1169 {
1170         const usb_descriptor_t *desc;
1171
1172         if (iter->cur + sizeof(usb_descriptor_t) >= iter->end) {
1173                 if (iter->cur != iter->end)
1174                         kprintf("usb_desc_iter_next: bad descriptor\n");
1175                 return NULL;
1176         }
1177         desc = (const usb_descriptor_t *)iter->cur;
1178         if (desc->bLength == 0) {
1179                 kprintf("usb_desc_iter_next: descriptor length = 0\n");
1180                 return NULL;
1181         }
1182         iter->cur += desc->bLength;
1183         if (iter->cur > iter->end) {
1184                 kprintf("usb_desc_iter_next: descriptor length too large\n");
1185                 return NULL;
1186         }
1187         return desc;
1188 }
1189
1190 usbd_status
1191 usbd_get_string(usbd_device_handle dev, int si, char *buf)
1192 {
1193         int swap = dev->quirks->uq_flags & UQ_SWAP_UNICODE;
1194         usb_string_descriptor_t us;
1195         char *s;
1196         int i, n;
1197         u_int16_t c;
1198         usbd_status err;
1199         int size;
1200
1201         buf[0] = '\0';
1202         if (si == 0)
1203                 return (USBD_INVAL);
1204         if (dev->quirks->uq_flags & UQ_NO_STRINGS)
1205                 return (USBD_STALLED);
1206         if (dev->langid == USBD_NOLANG) {
1207                 /* Set up default language */
1208                 err = usbd_get_string_desc(dev, USB_LANGUAGE_TABLE, 0, &us,
1209                     &size);
1210                 if (err || size < 4) {
1211                         DPRINTFN(-1,("usbd_get_string: getting lang failed, using 0\n"));
1212                         dev->langid = 0; /* Well, just pick something then */
1213                 } else {
1214                         /* Pick the first language as the default. */
1215                         dev->langid = UGETW(us.bString[0]);
1216                 }
1217         }
1218         err = usbd_get_string_desc(dev, si, dev->langid, &us, &size);
1219         if (err)
1220                 return (err);
1221         s = buf;
1222         n = size / 2 - 1;
1223         for (i = 0; i < n; i++) {
1224                 c = UGETW(us.bString[i]);
1225                 /* Convert from Unicode, handle buggy strings. */
1226                 if ((c & 0xff00) == 0)
1227                         *s++ = c;
1228                 else if ((c & 0x00ff) == 0 && swap)
1229                         *s++ = c >> 8;
1230                 else
1231                         *s++ = '?';
1232         }
1233         *s++ = 0;
1234         return (USBD_NORMAL_COMPLETION);
1235 }
1236
1237 #if defined(__FreeBSD__) || defined(__DragonFly__)
1238 int
1239 usbd_driver_load(module_t mod, int what, void *arg)
1240 {
1241         /* XXX should implement something like a function that removes all generic devices */
1242
1243         return (0);
1244 }
1245
1246 #endif