sys/bus/usb/uhub.c

   1 /*      $NetBSD: uhub.c,v 1.47 2000/09/24 02:08:38 augustss Exp $       */
   2 /*      $FreeBSD: src/sys/dev/usb/uhub.c,v 1.21.2.7 2002/11/06 20:23:50 joe Exp $       */
   3 /*      $DragonFly: src/sys/bus/usb/uhub.c,v 1.3 2003/08/07 21:16:47 dillon 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 /*
  43  * USB spec: http://www.usb.org/developers/docs.htm
  44  */
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/kernel.h>
  49 #include <sys/malloc.h>
  50 #if defined(__NetBSD__) || defined(__OpenBSD__)
  51 #include <sys/device.h>
  52 #include <sys/proc.h>
  53 #elif defined(__FreeBSD__)
  54 #include <sys/module.h>
  55 #include <sys/bus.h>
  56 #include "bus_if.h"
  57 #include <sys/sysctl.h>
  58 #endif
  59
  60 #include <machine/bus.h>
  61
  62 #include "usb.h"
  63 #include "usbdi.h"
  64 #include "usbdi_util.h"
  65 #include "usbdivar.h"
  66
  67 #define UHUB_INTR_INTERVAL 255  /* ms */
  68
  69 #ifdef USB_DEBUG
  70 #define DPRINTF(x)      if (uhubdebug) logprintf x
  71 #define DPRINTFN(n,x)   if (uhubdebug>(n)) logprintf x
  72 static int      uhubdebug = 0;
  73 SYSCTL_NODE(_hw_usb, OID_AUTO, uhub, CTLFLAG_RW, 0, "USB uhub");
  74 SYSCTL_INT(_hw_usb_uhub, OID_AUTO, debug, CTLFLAG_RW,
  75         &uhubdebug, 0, "uhub debug level");
  76 #else
  77 #define DPRINTF(x)
  78 #define DPRINTFN(n,x)
  79 #endif
  80
  81 struct uhub_softc {
  82         USBBASEDEVICE           sc_dev;         /* base device */
  83         usbd_device_handle      sc_hub;         /* USB device */
  84         usbd_pipe_handle        sc_ipipe;       /* interrupt pipe */
  85         u_int8_t                sc_status[1];   /* XXX more ports */
  86         u_char                  sc_running;
  87 };
  88
  89 Static usbd_status uhub_explore(usbd_device_handle hub);
  90 Static void uhub_intr(usbd_xfer_handle, usbd_private_handle,usbd_status);
  91
  92 #if defined(__FreeBSD__)
  93 Static bus_child_detached_t uhub_child_detached;
  94 #endif
  95
  96
  97 /*
  98  * We need two attachment points:
  99  * hub to usb and hub to hub
 100  * Every other driver only connects to hubs
 101  */
 102
 103 #if defined(__NetBSD__) || defined(__OpenBSD__)
 104 USB_DECLARE_DRIVER(uhub);
 105
 106 /* Create the driver instance for the hub connected to hub case */
 107 struct cfattach uhub_uhub_ca = {
 108         sizeof(struct uhub_softc), uhub_match, uhub_attach,
 109         uhub_detach, uhub_activate
 110 };
 111 #elif defined(__FreeBSD__)
 112 USB_DECLARE_DRIVER_INIT(uhub,
 113                         DEVMETHOD(bus_child_detached, uhub_child_detached),
 114                         DEVMETHOD(device_suspend, bus_generic_suspend),
 115                         DEVMETHOD(device_resume, bus_generic_resume),
 116                         DEVMETHOD(device_shutdown, bus_generic_shutdown)
 117                         );
 118
 119 /* Create the driver instance for the hub connected to usb case. */
 120 devclass_t uhubroot_devclass;
 121
 122 Static device_method_t uhubroot_methods[] = {
 123         DEVMETHOD(device_probe, uhub_match),
 124         DEVMETHOD(device_attach, uhub_attach),
 125         /* detach is not allowed for a root hub */
 126         DEVMETHOD(device_suspend, bus_generic_suspend),
 127         DEVMETHOD(device_resume, bus_generic_resume),
 128         DEVMETHOD(device_shutdown, bus_generic_shutdown),
 129         {0,0}
 130 };
 131
 132 Static  driver_t uhubroot_driver = {
 133         "uhub",
 134         uhubroot_methods,
 135         sizeof(struct uhub_softc)
 136 };
 137 #endif
 138
 139 USB_MATCH(uhub)
 140 {
 141         USB_MATCH_START(uhub, uaa);
 142         usb_device_descriptor_t *dd = usbd_get_device_descriptor(uaa->device);
 143
 144         DPRINTFN(5,("uhub_match, dd=%p\n", dd));
 145         /*
 146          * The subclass for hubs seems to be 0 for some and 1 for others,
 147          * so we just ignore the subclass.
 148          */
 149         if (uaa->iface == NULL && dd->bDeviceClass == UDCLASS_HUB)
 150                 return (UMATCH_DEVCLASS_DEVSUBCLASS);
 151         return (UMATCH_NONE);
 152 }
 153
 154 USB_ATTACH(uhub)
 155 {
 156         USB_ATTACH_START(uhub, sc, uaa);
 157         usbd_device_handle dev = uaa->device;
 158         char devinfo[1024];
 159         usbd_status err;
 160         struct usbd_hub *hub;
 161         usb_device_request_t req;
 162         usb_hub_descriptor_t hubdesc;
 163         int p, port, nports, nremov, pwrdly;
 164         usbd_interface_handle iface;
 165         usb_endpoint_descriptor_t *ed;
 166
 167         DPRINTFN(1,("uhub_attach\n"));
 168         sc->sc_hub = dev;
 169         usbd_devinfo(dev, 1, devinfo);
 170         USB_ATTACH_SETUP;
 171         printf("%s: %s\n", USBDEVNAME(sc->sc_dev), devinfo);
 172
 173         err = usbd_set_config_index(dev, 0, 1);
 174         if (err) {
 175                 DPRINTF(("%s: configuration failed, error=%s\n",
 176                          USBDEVNAME(sc->sc_dev), usbd_errstr(err)));
 177                 USB_ATTACH_ERROR_RETURN;
 178         }
 179
 180         if (dev->depth > USB_HUB_MAX_DEPTH) {
 181                 printf("%s: hub depth (%d) exceeded, hub ignored\n",
 182                        USBDEVNAME(sc->sc_dev), USB_HUB_MAX_DEPTH);
 183                 USB_ATTACH_ERROR_RETURN;
 184         }
 185
 186         /* Get hub descriptor. */
 187         req.bmRequestType = UT_READ_CLASS_DEVICE;
 188         req.bRequest = UR_GET_DESCRIPTOR;
 189         USETW(req.wValue, 0);
 190         USETW(req.wIndex, 0);
 191         USETW(req.wLength, USB_HUB_DESCRIPTOR_SIZE);
 192         DPRINTFN(1,("usb_init_hub: getting hub descriptor\n"));
 193         err = usbd_do_request(dev, &req, &hubdesc);
 194         nports = hubdesc.bNbrPorts;
 195         if (!err && nports > 7) {
 196                 USETW(req.wLength, USB_HUB_DESCRIPTOR_SIZE + (nports+1) / 8);
 197                 err = usbd_do_request(dev, &req, &hubdesc);
 198         }
 199         if (err) {
 200                 DPRINTF(("%s: getting hub descriptor failed, error=%s\n",
 201                          USBDEVNAME(sc->sc_dev), usbd_errstr(err)));
 202                 USB_ATTACH_ERROR_RETURN;
 203         }
 204
 205         for (nremov = 0, port = 1; port <= nports; port++)
 206                 if (!UHD_NOT_REMOV(&hubdesc, port))
 207                         nremov++;
 208         printf("%s: %d port%s with %d removable, %s powered\n",
 209                USBDEVNAME(sc->sc_dev), nports, nports != 1 ? "s" : "",
 210                nremov, dev->self_powered ? "self" : "bus");
 211
 212         hub = malloc(sizeof(*hub) + (nports-1) * sizeof(struct usbd_port),
 213                      M_USBDEV, M_NOWAIT);
 214         if (hub == NULL)
 215                 USB_ATTACH_ERROR_RETURN;
 216         dev->hub = hub;
 217         dev->hub->hubsoftc = sc;
 218         hub->explore = uhub_explore;
 219         hub->hubdesc = hubdesc;
 220
 221         DPRINTFN(1,("usbhub_init_hub: selfpowered=%d, parent=%p, "
 222                     "parent->selfpowered=%d\n",
 223                  dev->self_powered, dev->powersrc->parent,
 224                  dev->powersrc->parent ?
 225                  dev->powersrc->parent->self_powered : 0));
 226
 227         if (!dev->self_powered && dev->powersrc->parent != NULL &&
 228             !dev->powersrc->parent->self_powered) {
 229                 printf("%s: bus powered hub connected to bus powered hub, "
 230                        "ignored\n", USBDEVNAME(sc->sc_dev));
 231                 goto bad;
 232         }
 233
 234         /* Set up interrupt pipe. */
 235         err = usbd_device2interface_handle(dev, 0, &iface);
 236         if (err) {
 237                 printf("%s: no interface handle\n", USBDEVNAME(sc->sc_dev));
 238                 goto bad;
 239         }
 240         ed = usbd_interface2endpoint_descriptor(iface, 0);
 241         if (ed == NULL) {
 242                 printf("%s: no endpoint descriptor\n", USBDEVNAME(sc->sc_dev));
 243                 goto bad;
 244         }
 245         if ((ed->bmAttributes & UE_XFERTYPE) != UE_INTERRUPT) {
 246                 printf("%s: bad interrupt endpoint\n", USBDEVNAME(sc->sc_dev));
 247                 goto bad;
 248         }
 249
 250         err = usbd_open_pipe_intr(iface, ed->bEndpointAddress,
 251                   USBD_SHORT_XFER_OK, &sc->sc_ipipe, sc, sc->sc_status,
 252                   sizeof(sc->sc_status), uhub_intr, UHUB_INTR_INTERVAL);
 253         if (err) {
 254                 printf("%s: cannot open interrupt pipe\n",
 255                        USBDEVNAME(sc->sc_dev));
 256                 goto bad;
 257         }
 258
 259         /* Wait with power off for a while. */
 260         usbd_delay_ms(dev, USB_POWER_DOWN_TIME);
 261
 262         /*
 263          * To have the best chance of success we do things in the exact same
 264          * order as Windoze98.  This should not be necessary, but some
 265          * devices do not follow the USB specs to the letter.
 266          *
 267          * These are the events on the bus when a hub is attached:
 268          *  Get device and config descriptors (see attach code)
 269          *  Get hub descriptor (see above)
 270          *  For all ports
 271          *     turn on power
 272          *     wait for power to become stable
 273          * (all below happens in explore code)
 274          *  For all ports
 275          *     clear C_PORT_CONNECTION
 276          *  For all ports
 277          *     get port status
 278          *     if device connected
 279          *        turn on reset
 280          *        wait
 281          *        clear C_PORT_RESET
 282          *        get port status
 283          *        proceed with device attachment
 284          */
 285
 286         /* Set up data structures */
 287         for (p = 0; p < nports; p++) {
 288                 struct usbd_port *up = &hub->ports[p];
 289                 up->device = 0;
 290                 up->parent = dev;
 291                 up->portno = p+1;
 292                 if (dev->self_powered)
 293                         /* Self powered hub, give ports maximum current. */
 294                         up->power = USB_MAX_POWER;
 295                 else
 296                         up->power = USB_MIN_POWER;
 297         }
 298
 299         /* XXX should check for none, individual, or ganged power? */
 300
 301         pwrdly = dev->hub->hubdesc.bPwrOn2PwrGood * UHD_PWRON_FACTOR
 302             + USB_EXTRA_POWER_UP_TIME;
 303         for (port = 1; port <= nports; port++) {
 304                 /* Turn the power on. */
 305                 err = usbd_set_port_feature(dev, port, UHF_PORT_POWER);
 306                 if (err)
 307                         printf("%s: port %d power on failed, %s\n",
 308                                USBDEVNAME(sc->sc_dev), port,
 309                                usbd_errstr(err));
 310                 DPRINTF(("usb_init_port: turn on port %d power\n", port));
 311                 /* Wait for stable power. */
 312                 usbd_delay_ms(dev, pwrdly);
 313         }
 314
 315         /* The usual exploration will finish the setup. */
 316
 317         sc->sc_running = 1;
 318
 319         USB_ATTACH_SUCCESS_RETURN;
 320
 321  bad:
 322         free(hub, M_USBDEV);
 323         dev->hub = 0;
 324         USB_ATTACH_ERROR_RETURN;
 325 }
 326
 327 usbd_status
 328 uhub_explore(usbd_device_handle dev)
 329 {
 330         usb_hub_descriptor_t *hd = &dev->hub->hubdesc;
 331         struct uhub_softc *sc = dev->hub->hubsoftc;
 332         struct usbd_port *up;
 333         usbd_status err;
 334         int port;
 335         int change, status;
 336
 337         DPRINTFN(10, ("uhub_explore dev=%p addr=%d\n", dev, dev->address));
 338
 339         if (!sc->sc_running)
 340                 return (USBD_NOT_STARTED);
 341
 342         /* Ignore hubs that are too deep. */
 343         if (dev->depth > USB_HUB_MAX_DEPTH)
 344                 return (USBD_TOO_DEEP);
 345
 346         for(port = 1; port <= hd->bNbrPorts; port++) {
 347                 up = &dev->hub->ports[port-1];
 348                 err = usbd_get_port_status(dev, port, &up->status);
 349                 if (err) {
 350                         DPRINTF(("uhub_explore: get port status failed, "
 351                                  "error=%s\n", usbd_errstr(err)));
 352                         continue;
 353                 }
 354                 status = UGETW(up->status.wPortStatus);
 355                 change = UGETW(up->status.wPortChange);
 356                 DPRINTFN(3,("uhub_explore: port %d status 0x%04x 0x%04x\n",
 357                             port, status, change));
 358                 if (change & UPS_C_PORT_ENABLED) {
 359                         DPRINTF(("uhub_explore: C_PORT_ENABLED\n"));
 360                         usbd_clear_port_feature(dev, port, UHF_C_PORT_ENABLE);
 361                         if (status & UPS_PORT_ENABLED) {
 362                                 printf("%s: illegal enable change, port %d\n",
 363                                        USBDEVNAME(sc->sc_dev), port);
 364                         } else {
 365                                 /* Port error condition. */
 366                                 if (up->restartcnt) /* no message first time */
 367                                         printf("%s: port error, restarting "
 368                                                "port %d\n",
 369                                                USBDEVNAME(sc->sc_dev), port);
 370
 371                                 if (up->restartcnt++ < USBD_RESTART_MAX)
 372                                         goto disco;
 373                                 else
 374                                         printf("%s: port error, giving up "
 375                                                "port %d\n",
 376                                                USBDEVNAME(sc->sc_dev), port);
 377                         }
 378                 }
 379                 if (!(change & UPS_C_CONNECT_STATUS)) {
 380                         DPRINTFN(3,("uhub_explore: port=%d !C_CONNECT_"
 381                                     "STATUS\n", port));
 382                         /* No status change, just do recursive explore. */
 383                         if (up->device && up->device->hub)
 384                                 up->device->hub->explore(up->device);
 385                         continue;
 386                 }
 387
 388                 /* We have a connect status change, handle it. */
 389
 390                 DPRINTF(("uhub_explore: status change hub=%d port=%d\n",
 391                          dev->address, port));
 392                 usbd_clear_port_feature(dev, port, UHF_C_PORT_CONNECTION);
 393                 /*usbd_clear_port_feature(dev, port, UHF_C_PORT_ENABLE);*/
 394                 /*
 395                  * If there is already a device on the port the change status
 396                  * must mean that is has disconnected.  Looking at the
 397                  * current connect status is not enough to figure this out
 398                  * since a new unit may have been connected before we handle
 399                  * the disconnect.
 400                  */
 401         disco:
 402                 if (up->device != NULL) {
 403                         /* Disconnected */
 404                         DPRINTF(("uhub_explore: device addr=%d disappeared "
 405                                  "on port %d\n", up->device->address, port));
 406                         usb_disconnect_port(up, USBDEV(sc->sc_dev));
 407                         usbd_clear_port_feature(dev, port,
 408                                                 UHF_C_PORT_CONNECTION);
 409                 }
 410                 if (!(status & UPS_CURRENT_CONNECT_STATUS)) {
 411                         /* Nothing connected, just ignore it. */
 412                         DPRINTFN(3,("uhub_explore: port=%d !CURRENT_CONNECT"
 413                                     "_STATUS\n", port));
 414                         continue;
 415                 }
 416
 417                 /* Connected */
 418
 419                 if (!(status & UPS_PORT_POWER))
 420                         printf("%s: strange, connected port %d has no power\n",
 421                                USBDEVNAME(sc->sc_dev), port);
 422
 423                 /* Wait for maximum device power up time. */
 424                 usbd_delay_ms(dev, USB_PORT_POWERUP_DELAY);
 425
 426                 /* Reset port, which implies enabling it. */
 427                 if (usbd_reset_port(dev, port, &up->status)) {
 428                         printf("uhub_explore: port=%d reset failed\n",
 429                                  port);
 430                         continue;
 431                 }
 432
 433                 /* Get device info and set its address. */
 434                 err = usbd_new_device(USBDEV(sc->sc_dev), dev->bus,
 435                           dev->depth + 1, status & UPS_LOW_SPEED,
 436                           port, up);
 437                 /* XXX retry a few times? */
 438                 if (err) {
 439                         DPRINTFN(-1,("uhub_explore: usb_new_device failed, "
 440                                      "error=%s\n", usbd_errstr(err)));
 441                         /* Avoid addressing problems by disabling. */
 442                         /* usbd_reset_port(dev, port, &up->status); */
 443
 444                         /*
 445                          * The unit refused to accept a new address, or had
 446                          * some other serious problem.  Since we cannot leave
 447                          * at 0 we have to disable the port instead.
 448                          */
 449                         printf("%s: device problem, disabling port %d\n",
 450                                USBDEVNAME(sc->sc_dev), port);
 451                         usbd_clear_port_feature(dev, port, UHF_PORT_ENABLE);
 452                 } else {
 453                         /* The port set up succeeded, reset error count. */
 454                         up->restartcnt = 0;
 455
 456                         if (up->device->hub)
 457                                 up->device->hub->explore(up->device);
 458                 }
 459         }
 460         return (USBD_NORMAL_COMPLETION);
 461 }
 462
 463 #if defined(__NetBSD__) || defined(__OpenBSD__)
 464 int
 465 uhub_activate(device_ptr_t self, enum devact act)
 466 {
 467         struct uhub_softc *sc = (struct uhub_softc *)self;
 468         struct usbd_hub *hub = sc->sc_hub->hub;
 469         usbd_device_handle dev;
 470         int nports, port, i;
 471
 472         switch (act) {
 473         case DVACT_ACTIVATE:
 474                 return (EOPNOTSUPP);
 475                 break;
 476
 477         case DVACT_DEACTIVATE:
 478                 if (hub == NULL) /* malfunctioning hub */
 479                         break;
 480                 nports = hub->hubdesc.bNbrPorts;
 481                 for(port = 0; port < nports; port++) {
 482                         dev = hub->ports[port].device;
 483                         if (dev != NULL && dev->subdevs != NULL) {
 484                                 for (i = 0; dev->subdevs[i] != NULL; i++)
 485                                         config_deactivate(dev->subdevs[i]);
 486                         }
 487                 }
 488                 break;
 489         }
 490         return (0);
 491 }
 492 #endif
 493
 494 /*
 495  * Called from process context when the hub is gone.
 496  * Detach all devices on active ports.
 497  */
 498 USB_DETACH(uhub)
 499 {
 500         USB_DETACH_START(uhub, sc);
 501         struct usbd_hub *hub = sc->sc_hub->hub;
 502         struct usbd_port *rup;
 503         int port, nports;
 504
 505 #if defined(__NetBSD__) || defined(__OpenBSD__)
 506         DPRINTF(("uhub_detach: sc=%p flags=%d\n", sc, flags));
 507 #elif defined(__FreeBSD__)
 508         DPRINTF(("uhub_detach: sc=%port\n", sc));
 509 #endif
 510
 511         if (hub == NULL)                /* Must be partially working */
 512                 return (0);
 513
 514         usbd_abort_pipe(sc->sc_ipipe);
 515         usbd_close_pipe(sc->sc_ipipe);
 516
 517         nports = hub->hubdesc.bNbrPorts;
 518         for(port = 0; port < nports; port++) {
 519                 rup = &hub->ports[port];
 520                 if (rup->device)
 521                         usb_disconnect_port(rup, self);
 522         }
 523
 524
 525         free(hub, M_USBDEV);
 526         sc->sc_hub->hub = NULL;
 527
 528         return (0);
 529 }
 530
 531 #if defined(__FreeBSD__)
 532 /* Called when a device has been detached from it */
 533 Static void
 534 uhub_child_detached(device_t self, device_t child)
 535 {
 536        struct uhub_softc *sc = device_get_softc(self);
 537        usbd_device_handle devhub = sc->sc_hub;
 538        usbd_device_handle dev;
 539        int nports;
 540        int port;
 541        int i;
 542
 543        if (!devhub->hub)
 544                /* should never happen; children are only created after init */
 545                panic("hub not fully initialised, but child deleted?");
 546
 547        nports = devhub->hub->hubdesc.bNbrPorts;
 548        for (port = 0; port < nports; port++) {
 549                dev = devhub->hub->ports[port].device;
 550                if (dev && dev->subdevs) {
 551                        for (i = 0; dev->subdevs[i]; i++) {
 552                                if (dev->subdevs[i] == child) {
 553                                        dev->subdevs[i] = NULL;
 554                                        return;
 555                                }
 556                        }
 557                }
 558        }
 559 }
 560 #endif
 561
 562
 563 /*
 564  * Hub interrupt.
 565  * This an indication that some port has changed status.
 566  * Notify the bus event handler thread that we need
 567  * to be explored again.
 568  */
 569 void
 570 uhub_intr(usbd_xfer_handle xfer, usbd_private_handle addr, usbd_status status)
 571 {
 572         struct uhub_softc *sc = addr;
 573
 574         DPRINTFN(5,("uhub_intr: sc=%p\n", sc));
 575         if (status != USBD_NORMAL_COMPLETION)
 576                 usbd_clear_endpoint_stall_async(sc->sc_ipipe);
 577
 578         usb_needs_explore(sc->sc_hub->bus);
 579 }
 580
 581 #if defined(__FreeBSD__)
 582 DRIVER_MODULE(uhub, usb, uhubroot_driver, uhubroot_devclass, 0, 0);
 583 DRIVER_MODULE(uhub, uhub, uhub_driver, uhub_devclass, usbd_driver_load, 0);
 584 #endif