2 * $NetBSD: usb.c,v 1.68 2002/02/20 20:30:12 christos Exp $
3 * $FreeBSD: src/sys/dev/usb/usb.c,v 1.106 2005/03/27 15:31:23 iedowse Exp $
4 * $DragonFly: src/sys/bus/usb/usb.c,v 1.45 2008/05/26 12:37:44 mneumann Exp $
7 /* Also already merged from NetBSD:
8 * $NetBSD: usb.c,v 1.70 2002/05/09 21:54:32 augustss Exp $
9 * $NetBSD: usb.c,v 1.71 2002/06/01 23:51:04 lukem Exp $
10 * $NetBSD: usb.c,v 1.73 2002/09/23 05:51:19 simonb Exp $
11 * $NetBSD: usb.c,v 1.80 2003/11/07 17:03:25 wiz Exp $
15 * Copyright (c) 1998 The NetBSD Foundation, Inc.
16 * All rights reserved.
18 * This code is derived from software contributed to The NetBSD Foundation
19 * by Lennart Augustsson (lennart@augustsson.net) at
20 * Carlstedt Research & Technology.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * This product includes software developed by the NetBSD
33 * Foundation, Inc. and its contributors.
34 * 4. Neither the name of The NetBSD Foundation nor the names of its
35 * contributors may be used to endorse or promote products derived
36 * from this software without specific prior written permission.
38 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
39 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
40 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
42 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
43 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
44 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
45 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
46 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
48 * POSSIBILITY OF SUCH DAMAGE.
52 * USB specifications and other documentation can be found at
53 * http://www.usb.org/developers/docs/ and
54 * http://www.usb.org/developers/devclass_docs/
57 #include <sys/param.h>
58 #include <sys/systm.h>
59 #include <sys/kernel.h>
61 #include <sys/malloc.h>
62 #include <sys/unistd.h>
63 #include <sys/module.h>
65 #include <sys/fcntl.h>
66 #include <sys/filio.h>
68 #include <sys/kthread.h>
71 #include <sys/device.h>
73 #include <sys/select.h>
74 #include <sys/vnode.h>
75 #include <sys/signalvar.h>
76 #include <sys/sysctl.h>
77 #include <sys/thread2.h>
79 #include <bus/usb/usb.h>
80 #include <bus/usb/usbdi.h>
81 #include <bus/usb/usbdi_util.h>
83 #define USBUNIT(d) (minor(d)) /* usb_discover device nodes, kthread */
84 #define USB_DEV_MINOR 255 /* event queue device */
86 MALLOC_DEFINE(M_USB, "USB", "USB");
87 MALLOC_DEFINE(M_USBDEV, "USBdev", "USB device");
88 MALLOC_DEFINE(M_USBHC, "USBHC", "USB host controller");
92 #include <bus/usb/usbdivar.h>
93 #include <bus/usb/usb_quirks.h>
95 /* Define this unconditionally in case a kernel module is loaded that
96 * has been compiled with debugging options.
98 SYSCTL_NODE(_hw, OID_AUTO, usb, CTLFLAG_RW, 0, "USB debugging");
101 #define DPRINTF(x) if (usbdebug) kprintf x
102 #define DPRINTFN(n,x) if (usbdebug>(n)) kprintf x
104 SYSCTL_INT(_hw_usb, OID_AUTO, debug, CTLFLAG_RW,
105 &usbdebug, 0, "usb debug level");
107 * 0 - do usual exploration
108 * 1 - do not use timeout exploration
109 * >1 - do no exploration
111 int usb_noexplore = 0;
114 #define DPRINTFN(n,x)
119 TAILQ_ENTRY(usb_softc) sc_coldexplist; /* cold needs-explore list */
120 usbd_bus_handle sc_bus; /* USB controller */
121 struct usbd_port sc_port; /* dummy port for root hub */
123 struct thread *sc_event_thread;
129 TAILQ_HEAD(, usb_task) tasks;
130 struct thread *task_thread_proc;
132 int taskcreated; /* task thread exists. */
134 static struct usb_taskq usb_taskq[USB_NUM_TASKQS];
142 struct dev_ops usb_ops = {
143 { "usb", USB_CDEV_MAJOR, 0 },
151 static void usb_discover(device_t);
152 static bus_child_detached_t usb_child_detached;
153 static void usb_create_event_thread(device_t);
154 static void usb_event_thread(void *);
155 static void usb_task_thread(void *);
157 static cdev_t usb_dev; /* The /dev/usb device. */
158 static int usb_ndevs; /* Number of /dev/usbN devices. */
159 /* Busses to explore at the end of boot-time device configuration */
160 static TAILQ_HEAD(, usb_softc) usb_coldexplist =
161 TAILQ_HEAD_INITIALIZER(usb_coldexplist);
163 #define USB_MAX_EVENTS 100
166 TAILQ_ENTRY(usb_event_q) next;
168 static TAILQ_HEAD(, usb_event_q) usb_events =
169 TAILQ_HEAD_INITIALIZER(usb_events);
170 static int usb_nevents = 0;
171 static struct selinfo usb_selevent;
172 static struct proc *usb_async_proc; /* process that wants USB SIGIO */
173 static int usb_dev_open = 0;
174 static void usb_add_event(int, struct usb_event *);
176 static int usb_get_next_event(struct usb_event *);
178 static const char *usbrev_str[] = USBREV_STR;
180 static device_probe_t usb_match;
181 static device_attach_t usb_attach;
182 static device_detach_t usb_detach;
184 static devclass_t usb_devclass;
186 static kobj_method_t usb_methods[] = {
187 DEVMETHOD(device_probe, usb_match),
188 DEVMETHOD(device_attach, usb_attach),
189 DEVMETHOD(device_detach, usb_detach),
190 DEVMETHOD(bus_child_detached, usb_child_detached),
191 DEVMETHOD(device_suspend, bus_generic_suspend),
192 DEVMETHOD(device_resume, bus_generic_resume),
193 DEVMETHOD(device_shutdown, bus_generic_shutdown),
197 static driver_t usb_driver = {
200 sizeof(struct usb_softc)
203 MODULE_DEPEND(usb, usb, 1, 1, 1);
204 MODULE_VERSION(usb, 1);
207 usb_match(device_t self)
209 DPRINTF(("usbd_match\n"));
210 return (UMATCH_GENERIC);
214 usb_attach(device_t self)
216 struct usb_softc *sc = device_get_softc(self);
217 void *aux = device_get_ivars(self);
219 usbd_device_handle dev;
225 DPRINTF(("usbd_attach\n"));
229 sc->sc_bus->usbctl = sc;
230 sc->sc_port.power = USB_MAX_POWER;
232 usbrev = sc->sc_bus->usbrev;
233 device_printf(self, "USB revision %s", usbrev_str[usbrev]);
237 speed = USB_SPEED_FULL;
240 speed = USB_SPEED_HIGH;
243 kprintf(", not supported\n");
249 /* Make sure not to use tsleep() if we are cold booting. */
251 sc->sc_bus->use_polling++;
253 ue.u.ue_ctrlr.ue_bus = device_get_unit(self);
254 usb_add_event(USB_EVENT_CTRLR_ATTACH, &ue);
256 #ifdef USB_USE_SOFTINTR
257 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
258 /* XXX we should have our own level */
259 sc->sc_bus->soft = softintr_establish(IPL_SOFTNET,
260 sc->sc_bus->methods->soft_intr, sc->sc_bus);
261 if (sc->sc_bus->soft == NULL) {
262 device_printf(self, "can't register softintr\n");
267 callout_init(&sc->sc_bus->softi);
271 err = usbd_new_device(self, sc->sc_bus, 0, speed, 0,
274 dev = sc->sc_port.device;
275 if (dev->hub == NULL) {
278 "root device is not a hub\n");
281 sc->sc_bus->root_hub = dev;
284 * Turning this code off will delay attachment of USB devices
285 * until the USB event thread is running, which means that
286 * the keyboard will not work until after cold boot.
289 /* Explore high-speed busses before others. */
290 if (speed == USB_SPEED_HIGH)
291 dev->hub->explore(sc->sc_bus->root_hub);
293 TAILQ_INSERT_TAIL(&usb_coldexplist, sc,
299 "root hub problem, error=%d\n", err);
303 sc->sc_bus->use_polling--;
305 usb_create_event_thread(self);
306 /* The per controller devices (used for usb_discover) */
307 /* XXX This is redundant now, but old usbd's will want it */
308 dev_ops_add(&usb_ops, -1, device_get_unit(self));
309 tmp_dev = make_dev(&usb_ops, device_get_unit(self),
310 UID_ROOT, GID_OPERATOR, 0660,
311 "usb%d", device_get_unit(self));
312 sc->sc_usbdev = reference_dev(tmp_dev);
313 if (usb_ndevs++ == 0) {
314 /* The device spitting out events */
315 dev_ops_add(&usb_ops, -1, USB_DEV_MINOR);
316 tmp_dev = make_dev(&usb_ops, USB_DEV_MINOR,
317 UID_ROOT, GID_OPERATOR, 0660, "usb");
318 usb_dev = reference_dev(tmp_dev);
324 static const char *taskq_names[] = USB_TASKQ_NAMES;
327 usb_create_event_thread(device_t self)
329 struct usb_softc *sc = device_get_softc(self);
332 if (kthread_create(usb_event_thread, self, &sc->sc_event_thread,
333 "%s", device_get_nameunit(self))) {
335 "unable to create event thread for\n");
336 panic("usb_create_event_thread");
339 for (i = 0; i < USB_NUM_TASKQS; i++) {
340 struct usb_taskq *taskq = &usb_taskq[i];
342 if (taskq->taskcreated == 0) {
343 taskq->taskcreated = 1;
344 taskq->name = taskq_names[i];
345 TAILQ_INIT(&taskq->tasks);
346 if (kthread_create(usb_task_thread, taskq,
347 &taskq->task_thread_proc, taskq->name)) {
348 kprintf("unable to create task thread\n");
349 panic("usb_create_event_thread task");
356 * Add a task to be performed by the task thread. This function can be
357 * called from any context and the task will be executed in a process
361 usb_add_task(usbd_device_handle dev, struct usb_task *task, int queue)
363 struct usb_taskq *taskq;
367 taskq = &usb_taskq[queue];
368 if (task->queue == -1) {
369 DPRINTFN(2,("usb_add_task: task=%p\n", task));
370 TAILQ_INSERT_TAIL(&taskq->tasks, task, next);
373 DPRINTFN(3,("usb_add_task: task=%p on q\n", task));
375 wakeup(&taskq->tasks);
381 usb_do_task(usbd_device_handle dev, struct usb_task *task, int queue,
384 struct usb_taskq *taskq;
388 taskq = &usb_taskq[queue];
389 if (task->queue == -1) {
390 DPRINTFN(2,("usb_add_task: task=%p\n", task));
391 TAILQ_INSERT_TAIL(&taskq->tasks, task, next);
394 DPRINTFN(3,("usb_add_task: task=%p on q\n", task));
396 wakeup(&taskq->tasks);
398 /* Wait until task is finished */
399 tsleep((&taskq->tasks + 1), 0, "usbdotsk", time_out);
405 usb_rem_task(usbd_device_handle dev, struct usb_task *task)
408 if (task->queue != -1) {
409 TAILQ_REMOVE(&usb_taskq[task->queue].tasks, task, next);
416 usb_event_thread(void *arg)
419 struct usb_softc *sc = device_get_softc(self);
421 DPRINTF(("usb_event_thread: start\n"));
424 * In case this controller is a companion controller to an
425 * EHCI controller we need to wait until the EHCI controller
426 * has grabbed the port.
427 * XXX It would be nicer to do this with a tsleep(), but I don't
428 * know how to synchronize the creation of the threads so it
431 usb_delay_ms(sc->sc_bus, 500);
435 /* Make sure first discover does something. */
436 sc->sc_bus->needs_explore = 1;
439 while (!sc->sc_dying) {
441 if (usb_noexplore < 2)
445 tsleep(&sc->sc_bus->needs_explore, 0, "usbevt",
446 usb_noexplore ? 0 : hz * 60);
448 tsleep(&sc->sc_bus->needs_explore, 0, "usbevt", hz * 60);
450 DPRINTFN(2,("usb_event_thread: woke up\n"));
452 sc->sc_event_thread = NULL;
456 /* In case parent is waiting for us to exit. */
459 DPRINTF(("usb_event_thread: exit\n"));
464 usb_task_thread(void *arg)
466 struct usb_task *task;
467 struct usb_taskq *taskq;
472 DPRINTF(("usb_task_thread: start taskq %s\n", taskq->name));
474 while (usb_ndevs > 0) {
475 task = TAILQ_FIRST(&taskq->tasks);
477 tsleep(&taskq->tasks, 0, "usbtsk", 0);
478 task = TAILQ_FIRST(&taskq->tasks);
480 DPRINTFN(2,("usb_task_thread: woke up task=%p\n", task));
482 TAILQ_REMOVE(&taskq->tasks, task, next);
485 task->fun(task->arg);
487 wakeup((&taskq->tasks + 1));
493 taskq->taskcreated = 0;
494 wakeup(&taskq->taskcreated);
496 DPRINTF(("usb_event_thread: exit\n"));
500 usbopen(struct dev_open_args *ap)
502 cdev_t dev = ap->a_head.a_dev;
503 int unit = USBUNIT(dev);
504 struct usb_softc *sc;
506 if (unit == USB_DEV_MINOR) {
510 usb_async_proc = NULL;
514 sc = devclass_get_softc(usb_devclass, unit);
525 usbread(struct dev_read_args *ap)
527 cdev_t dev = ap->a_head.a_dev;
528 struct uio *uio = ap->a_uio;
530 int unit = USBUNIT(dev);
533 if (unit != USB_DEV_MINOR)
536 if (uio->uio_resid != sizeof(struct usb_event))
542 n = usb_get_next_event(&ue);
545 if (ap->a_ioflag & IO_NDELAY) {
549 error = tsleep(&usb_events, PCATCH, "usbrea", 0);
555 error = uiomove((void *)&ue, uio->uio_resid, uio);
561 usbclose(struct dev_close_args *ap)
563 cdev_t dev = ap->a_head.a_dev;
564 int unit = USBUNIT(dev);
566 if (unit == USB_DEV_MINOR) {
567 usb_async_proc = NULL;
575 usbioctl(struct dev_ioctl_args *ap)
577 cdev_t devt = ap->a_head.a_dev;
578 struct usb_softc *sc;
579 int unit = USBUNIT(devt);
581 if (unit == USB_DEV_MINOR) {
584 if (*(int *)ap->a_data)
585 usb_async_proc = curproc;
587 usb_async_proc = NULL;
595 sc = devclass_get_softc(usb_devclass, unit);
601 /* This part should be deleted */
606 struct usb_ctl_request *ur = (void *)ap->a_data;
607 int len = UGETW(ur->ucr_request.wLength);
611 int addr = ur->ucr_addr;
615 DPRINTF(("usbioctl: USB_REQUEST addr=%d len=%d\n", addr, len));
616 if (len < 0 || len > 32768)
618 if (addr < 0 || addr >= USB_MAX_DEVICES ||
619 sc->sc_bus->devices[addr] == 0)
622 iov.iov_base = (caddr_t)ur->ucr_data;
628 uio.uio_segflg = UIO_USERSPACE;
630 ur->ucr_request.bmRequestType & UT_READ ?
631 UIO_READ : UIO_WRITE;
632 uio.uio_td = curthread;
633 ptr = kmalloc(len, M_TEMP, M_WAITOK);
634 if (uio.uio_rw == UIO_WRITE) {
635 error = uiomove(ptr, len, &uio);
640 err = usbd_do_request_flags(sc->sc_bus->devices[addr],
641 &ur->ucr_request, ptr, ur->ucr_flags, &ur->ucr_actlen,
642 USBD_DEFAULT_TIMEOUT);
648 if (uio.uio_rw == UIO_READ) {
649 error = uiomove(ptr, len, &uio);
662 struct usb_device_info *di = (void *)ap->a_data;
663 int addr = di->udi_addr;
664 usbd_device_handle dev;
666 if (addr < 1 || addr >= USB_MAX_DEVICES)
668 dev = sc->sc_bus->devices[addr];
671 usbd_fill_deviceinfo(dev, di, 1);
675 case USB_DEVICESTATS:
676 *(struct usb_device_stats *)ap->a_data = sc->sc_bus->stats;
686 usbpoll(struct dev_poll_args *ap)
688 cdev_t dev = ap->a_head.a_dev;
690 int unit = USBUNIT(dev);
692 if (unit == USB_DEV_MINOR) {
694 mask = POLLIN | POLLRDNORM;
697 if (ap->a_events & mask && usb_nevents > 0)
698 revents |= ap->a_events & mask;
699 if (revents == 0 && ap->a_events & mask)
700 selrecord(curthread, &usb_selevent);
702 ap->a_events = revents;
706 return (0); /* select/poll never wakes up - back compat */
710 /* Explore device tree from the root. */
712 usb_discover(device_t self)
714 struct usb_softc *sc = device_get_softc(self);
716 DPRINTFN(2,("usb_discover\n"));
718 if (usb_noexplore > 1)
723 * We need mutual exclusion while traversing the device tree,
724 * but this is guaranteed since this function is only called
725 * from the event thread for the controller.
728 while (sc->sc_bus->needs_explore && !sc->sc_dying) {
729 sc->sc_bus->needs_explore = 0;
732 sc->sc_bus->root_hub->hub->explore(sc->sc_bus->root_hub);
740 usb_needs_explore(usbd_device_handle dev)
742 DPRINTFN(2,("usb_needs_explore\n"));
743 dev->bus->needs_explore = 1;
744 wakeup(&dev->bus->needs_explore);
747 /* Called from a critical section */
749 usb_get_next_event(struct usb_event *ue)
751 struct usb_event_q *ueq;
753 if (usb_nevents <= 0)
755 ueq = TAILQ_FIRST(&usb_events);
758 kprintf("usb: usb_nevents got out of sync! %d\n", usb_nevents);
764 TAILQ_REMOVE(&usb_events, ueq, next);
765 kfree(ueq, M_USBDEV);
771 usbd_add_dev_event(int type, usbd_device_handle udev)
775 usbd_fill_deviceinfo(udev, &ue.u.ue_device, USB_EVENT_IS_ATTACH(type));
776 usb_add_event(type, &ue);
780 usbd_add_drv_event(int type, usbd_device_handle udev, device_t dev)
784 ue.u.ue_driver.ue_cookie = udev->cookie;
785 strncpy(ue.u.ue_driver.ue_devname, device_get_nameunit(dev),
786 sizeof ue.u.ue_driver.ue_devname);
787 usb_add_event(type, &ue);
791 usb_add_event(int type, struct usb_event *uep)
793 struct usb_event_q *ueq;
795 struct timeval thetime;
797 ueq = kmalloc(sizeof *ueq, M_USBDEV, M_INTWAIT);
799 ueq->ue.ue_type = type;
801 TIMEVAL_TO_TIMESPEC(&thetime, &ueq->ue.ue_time);
804 if (USB_EVENT_IS_DETACH(type)) {
805 struct usb_event_q *ueqi, *ueqi_next;
807 for (ueqi = TAILQ_FIRST(&usb_events); ueqi; ueqi = ueqi_next) {
808 ueqi_next = TAILQ_NEXT(ueqi, next);
809 if (ueqi->ue.u.ue_driver.ue_cookie.cookie ==
810 uep->u.ue_device.udi_cookie.cookie) {
811 TAILQ_REMOVE(&usb_events, ueqi, next);
812 kfree(ueqi, M_USBDEV);
814 ueqi_next = TAILQ_FIRST(&usb_events);
818 if (usb_nevents >= USB_MAX_EVENTS) {
819 /* Too many queued events, drop an old one. */
820 DPRINTF(("usb: event dropped\n"));
821 usb_get_next_event(&ue);
823 TAILQ_INSERT_TAIL(&usb_events, ueq, next);
826 selwakeup(&usb_selevent);
827 if (usb_async_proc != NULL) {
828 ksignal(usb_async_proc, SIGIO);
834 usb_schedsoftintr(usbd_bus_handle bus)
836 DPRINTFN(10,("usb_schedsoftintr: polling=%d\n", bus->use_polling));
837 #ifdef USB_USE_SOFTINTR
838 if (bus->use_polling) {
839 bus->methods->soft_intr(bus);
841 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
842 softintr_schedule(bus->soft);
844 if (!callout_pending(&bus->softi))
845 callout_reset(&bus->softi, 0, bus->methods->soft_intr,
847 #endif /* __HAVE_GENERIC_SOFT_INTERRUPTS */
850 bus->methods->soft_intr(bus);
851 #endif /* USB_USE_SOFTINTR */
855 usb_detach(device_t self)
857 struct usb_softc *sc = device_get_softc(self);
860 DPRINTF(("usb_detach: start\n"));
864 /* Make all devices disconnect. */
865 if (sc->sc_port.device != NULL)
866 usb_disconnect_port(&sc->sc_port, self);
868 /* Kill off event thread. */
869 if (sc->sc_event_thread != NULL) {
870 wakeup(&sc->sc_bus->needs_explore);
871 if (tsleep(sc, 0, "usbdet", hz * 60))
873 "event thread didn't die\n");
874 DPRINTF(("usb_detach: event thread dead\n"));
877 destroy_dev(sc->sc_usbdev);
878 if (--usb_ndevs == 0) {
881 destroy_dev(usb_dev);
884 for (i = 0; i < USB_NUM_TASKQS; i++) {
885 struct usb_taskq *taskq = &usb_taskq[i];
886 wakeup(&taskq->tasks);
887 if (tsleep(&taskq->taskcreated, 0, "usbtdt",
889 kprintf("usb task thread %s didn't die\n",
897 #ifdef USB_USE_SOFTINTR
898 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
899 if (sc->sc_bus->soft != NULL) {
900 softintr_disestablish(sc->sc_bus->soft);
901 sc->sc_bus->soft = NULL;
904 callout_stop(&sc->sc_bus->softi);
908 ue.u.ue_ctrlr.ue_bus = device_get_unit(self);
909 usb_add_event(USB_EVENT_CTRLR_DETACH, &ue);
915 usb_child_detached(device_t self, device_t child)
917 struct usb_softc *sc = device_get_softc(self);
919 /* XXX, should check it is the right device. */
920 sc->sc_port.device = NULL;
923 /* Explore USB busses at the end of device configuration */
925 usb_cold_explore(void *arg)
927 struct usb_softc *sc;
929 KASSERT(cold || TAILQ_EMPTY(&usb_coldexplist),
930 ("usb_cold_explore: busses to explore when !cold"));
931 while (!TAILQ_EMPTY(&usb_coldexplist)) {
932 sc = TAILQ_FIRST(&usb_coldexplist);
933 TAILQ_REMOVE(&usb_coldexplist, sc, sc_coldexplist);
935 sc->sc_bus->use_polling++;
936 sc->sc_port.device->hub->explore(sc->sc_bus->root_hub);
937 sc->sc_bus->use_polling--;
941 SYSINIT(usb_cold_explore, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE,
942 usb_cold_explore, NULL);
944 DRIVER_MODULE(usb, ohci, usb_driver, usb_devclass, 0, 0);
945 DRIVER_MODULE(usb, uhci, usb_driver, usb_devclass, 0, 0);
946 DRIVER_MODULE(usb, ehci, usb_driver, usb_devclass, 0, 0);