1 /* $NetBSD: uhub.c,v 1.68 2004/06/29 06:30:05 mycroft Exp $ */
2 /* $FreeBSD: src/sys/dev/usb/uhub.c,v 1.69.2.1 2005/12/18 15:51:31 iedowse Exp $ */
3 /* $DragonFly: src/sys/bus/usb/uhub.c,v 1.21 2008/05/21 19:56:46 mneumann Exp $ */
6 * Copyright (c) 1998 The NetBSD Foundation, Inc.
9 * This code is derived from software contributed to The NetBSD Foundation
10 * by Lennart Augustsson (lennart@augustsson.net) at
11 * Carlstedt Research & Technology.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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.
43 * USB spec: http://www.usb.org/developers/docs/usbspec.zip
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/malloc.h>
50 #include <sys/module.h>
53 #include <sys/thread2.h>
54 #include <sys/sysctl.h>
56 #include <bus/usb/usb.h>
57 #include <bus/usb/usbdi.h>
58 #include <bus/usb/usbdi_util.h>
59 #include <bus/usb/usbdivar.h>
61 #define UHUB_INTR_INTERVAL 255 /* ms */
64 #define DPRINTF(x) if (uhubdebug) kprintf x
65 #define DPRINTFN(n,x) if (uhubdebug>(n)) kprintf x
67 SYSCTL_NODE(_hw_usb, OID_AUTO, uhub, CTLFLAG_RW, 0, "USB uhub");
68 SYSCTL_INT(_hw_usb_uhub, OID_AUTO, debug, CTLFLAG_RW,
69 &uhubdebug, 0, "uhub debug level");
76 device_t sc_dev; /* base device */
77 usbd_device_handle sc_hub; /* USB device */
78 usbd_pipe_handle sc_ipipe; /* interrupt pipe */
79 u_int8_t sc_status[1]; /* XXX more ports */
82 #define UHUB_PROTO(sc) ((sc)->sc_hub->ddesc.bDeviceProtocol)
83 #define UHUB_IS_HIGH_SPEED(sc) (UHUB_PROTO(sc) != UDPROTO_FSHUB)
84 #define UHUB_IS_SINGLE_TT(sc) (UHUB_PROTO(sc) == UDPROTO_HSHUBSTT)
86 static usbd_status uhub_explore(usbd_device_handle hub);
87 static void uhub_intr(usbd_xfer_handle, usbd_private_handle,usbd_status);
89 static bus_child_detached_t uhub_child_detached;
90 static bus_child_location_str_t uhub_child_location_str;
91 static bus_child_pnpinfo_str_t uhub_child_pnpinfo_str;
94 * We need two attachment points:
95 * hub to usb and hub to hub
96 * Every other driver only connects to hubs
99 static device_probe_t uhub_match;
100 static device_attach_t uhub_attach;
101 static device_detach_t uhub_detach;
103 static devclass_t uhub_devclass;
105 static kobj_method_t uhub_methods[] = {
106 DEVMETHOD(device_probe, uhub_match),
107 DEVMETHOD(device_attach, uhub_attach),
108 DEVMETHOD(device_detach, uhub_detach),
109 DEVMETHOD(bus_child_detached, uhub_child_detached),
110 DEVMETHOD(bus_child_pnpinfo_str, uhub_child_pnpinfo_str),
111 DEVMETHOD(bus_child_location_str, uhub_child_location_str),
112 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
113 DEVMETHOD(device_suspend, bus_generic_suspend),
114 DEVMETHOD(device_resume, bus_generic_resume),
115 DEVMETHOD(device_shutdown, bus_generic_shutdown),
119 static driver_t uhub_driver = {
122 sizeof(struct uhub_softc)
125 MODULE_DEPEND(uhub, usb, 1, 1, 1);
127 /* Create the driver instance for the hub connected to usb case. */
128 devclass_t uhubroot_devclass;
130 static device_method_t uhubroot_methods[] = {
131 DEVMETHOD(bus_child_detached, uhub_child_detached),
132 DEVMETHOD(bus_child_location_str, uhub_child_location_str),
133 DEVMETHOD(bus_child_pnpinfo_str, uhub_child_pnpinfo_str),
134 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
136 DEVMETHOD(device_probe, uhub_match),
137 DEVMETHOD(device_attach, uhub_attach),
138 DEVMETHOD(device_detach, uhub_detach),
139 DEVMETHOD(device_suspend, bus_generic_suspend),
140 DEVMETHOD(device_resume, bus_generic_resume),
141 DEVMETHOD(device_shutdown, bus_generic_shutdown),
145 static driver_t uhubroot_driver = {
148 sizeof(struct uhub_softc)
152 uhub_match(device_t self)
154 struct usb_attach_arg *uaa = device_get_ivars(self);
155 usb_device_descriptor_t *dd = usbd_get_device_descriptor(uaa->device);
157 DPRINTFN(5,("uhub_match, dd=%p\n", dd));
159 * The subclass for hubs seems to be 0 for some and 1 for others,
160 * so we just ignore the subclass.
162 if (uaa->iface == NULL && dd->bDeviceClass == UDCLASS_HUB)
163 return (UMATCH_DEVCLASS_DEVSUBCLASS);
164 return (UMATCH_NONE);
168 uhub_attach(device_t self)
170 struct uhub_softc *sc = device_get_softc(self);
171 struct usb_attach_arg *uaa = device_get_ivars(self);
172 usbd_device_handle dev = uaa->device;
174 struct usbd_hub *hub = NULL;
175 usb_device_request_t req;
176 usb_hub_descriptor_t hubdesc;
177 int p, port, nports, nremov, pwrdly;
178 usbd_interface_handle iface;
179 usb_endpoint_descriptor_t *ed;
180 struct usbd_tt *tts = NULL;
182 DPRINTFN(1,("uhub_attach\n"));
186 if (dev->depth > 0 && UHUB_IS_HIGH_SPEED(sc)) {
187 device_printf(sc->sc_dev,
188 "%s transaction translator%s\n",
189 UHUB_IS_SINGLE_TT(sc) ? "single" : "multiple",
190 UHUB_IS_SINGLE_TT(sc) ? "" : "s");
192 err = usbd_set_config_index(dev, 0, 1);
194 DPRINTF(("%s: configuration failed, error=%s\n",
195 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
199 if (dev->depth > USB_HUB_MAX_DEPTH) {
200 device_printf(sc->sc_dev,
201 "hub depth (%d) exceeded, hub ignored\n",
206 /* Get hub descriptor. */
207 req.bmRequestType = UT_READ_CLASS_DEVICE;
208 req.bRequest = UR_GET_DESCRIPTOR;
209 USETW2(req.wValue, (dev->address > 1 ? UDESC_HUB : 0), 0);
210 USETW(req.wIndex, 0);
211 USETW(req.wLength, USB_HUB_DESCRIPTOR_SIZE);
212 DPRINTFN(1,("usb_init_hub: getting hub descriptor\n"));
213 err = usbd_do_request(dev, &req, &hubdesc);
214 nports = hubdesc.bNbrPorts;
215 if (!err && nports > 7) {
216 USETW(req.wLength, USB_HUB_DESCRIPTOR_SIZE + (nports+1) / 8);
217 err = usbd_do_request(dev, &req, &hubdesc);
220 DPRINTF(("%s: getting hub descriptor failed, error=%s\n",
221 device_get_nameunit(sc->sc_dev), usbd_errstr(err)));
225 for (nremov = 0, port = 1; port <= nports; port++)
226 if (!UHD_NOT_REMOV(&hubdesc, port))
228 device_printf(sc->sc_dev,
229 "%d port%s with %d removable, %s powered\n",
230 nports, nports != 1 ? "s" : "",
231 nremov, dev->self_powered ? "self" : "bus");
234 device_printf(sc->sc_dev, "no ports, hub ignored\n");
238 hub = kmalloc(sizeof(*hub) + (nports-1) * sizeof(struct usbd_port),
241 dev->hub->hubsoftc = sc;
242 hub->explore = uhub_explore;
243 hub->hubdesc = hubdesc;
245 DPRINTFN(1,("usbhub_init_hub: selfpowered=%d, parent=%p, "
246 "parent->selfpowered=%d\n",
247 dev->self_powered, dev->powersrc->parent,
248 dev->powersrc->parent ?
249 dev->powersrc->parent->self_powered : 0));
251 if (!dev->self_powered && dev->powersrc->parent != NULL &&
252 !dev->powersrc->parent->self_powered) {
253 device_printf(sc->sc_dev,
254 "bus powered hub connected to bus powered hub, "
259 /* Set up interrupt pipe. */
260 err = usbd_device2interface_handle(dev, 0, &iface);
262 device_printf(sc->sc_dev, "no interface handle\n");
265 ed = usbd_interface2endpoint_descriptor(iface, 0);
267 device_printf(sc->sc_dev, "no endpoint descriptor\n");
270 if ((ed->bmAttributes & UE_XFERTYPE) != UE_INTERRUPT) {
271 device_printf(sc->sc_dev, "bad interrupt endpoint\n");
275 err = usbd_open_pipe_intr(iface, ed->bEndpointAddress,
276 USBD_SHORT_XFER_OK, &sc->sc_ipipe, sc, sc->sc_status,
277 sizeof(sc->sc_status), uhub_intr, UHUB_INTR_INTERVAL);
279 device_printf(sc->sc_dev, "cannot open interrupt pipe\n");
283 /* Wait with power off for a while. */
284 usbd_delay_ms(dev, USB_POWER_DOWN_TIME);
286 usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, dev, sc->sc_dev);
289 * To have the best chance of success we do things in the exact same
290 * order as Windoze98. This should not be necessary, but some
291 * devices do not follow the USB specs to the letter.
293 * These are the events on the bus when a hub is attached:
294 * Get device and config descriptors (see attach code)
295 * Get hub descriptor (see above)
298 * wait for power to become stable
299 * (all below happens in explore code)
301 * clear C_PORT_CONNECTION
304 * if device connected
310 * proceed with device attachment
313 if (UHUB_IS_HIGH_SPEED(sc)) {
314 tts = kmalloc((UHUB_IS_SINGLE_TT(sc) ? 1 : nports) *
315 sizeof(struct usbd_tt), M_USBDEV, M_WAITOK);
318 /* Set up data structures */
319 for (p = 0; p < nports; p++) {
320 struct usbd_port *up = &hub->ports[p];
324 if (dev->self_powered)
325 /* Self powered hub, give ports maximum current. */
326 up->power = USB_MAX_POWER;
328 up->power = USB_MIN_POWER;
330 if (UHUB_IS_HIGH_SPEED(sc)) {
331 up->tt = &tts[UHUB_IS_SINGLE_TT(sc) ? 0 : p];
338 /* XXX should check for none, individual, or ganged power? */
340 pwrdly = dev->hub->hubdesc.bPwrOn2PwrGood * UHD_PWRON_FACTOR
341 + USB_EXTRA_POWER_UP_TIME;
342 for (port = 1; port <= nports; port++) {
343 /* Turn the power on. */
344 err = usbd_set_port_feature(dev, port, UHF_PORT_POWER);
346 device_printf(sc->sc_dev,
347 "port %d power on failed, %s\n",
348 port, usbd_errstr(err));
349 DPRINTF(("usb_init_port: turn on port %d power\n", port));
352 /* Wait for stable power if we are not a root hub */
353 if (dev->powersrc->parent != NULL)
354 usbd_delay_ms(dev, pwrdly);
356 /* The usual exploration will finish the setup. */
364 kfree(hub, M_USBDEV);
370 uhub_explore(usbd_device_handle dev)
372 usb_hub_descriptor_t *hd = &dev->hub->hubdesc;
373 struct uhub_softc *sc = dev->hub->hubsoftc;
374 struct usbd_port *up;
380 DPRINTFN(10, ("uhub_explore dev=%p addr=%d\n", dev, dev->address));
383 return (USBD_NOT_STARTED);
385 /* Ignore hubs that are too deep. */
386 if (dev->depth > USB_HUB_MAX_DEPTH)
387 return (USBD_TOO_DEEP);
389 for(port = 1; port <= hd->bNbrPorts; port++) {
390 up = &dev->hub->ports[port-1];
391 err = usbd_get_port_status(dev, port, &up->status);
393 DPRINTF(("uhub_explore: get port status failed, "
394 "error=%s\n", usbd_errstr(err)));
397 status = UGETW(up->status.wPortStatus);
398 change = UGETW(up->status.wPortChange);
399 DPRINTFN(3,("uhub_explore: %s port %d status 0x%04x 0x%04x\n",
400 device_get_nameunit(sc->sc_dev), port, status, change));
401 if (change & UPS_C_PORT_ENABLED) {
402 DPRINTF(("uhub_explore: C_PORT_ENABLED 0x%x\n", change));
403 usbd_clear_port_feature(dev, port, UHF_C_PORT_ENABLE);
404 if (change & UPS_C_CONNECT_STATUS) {
405 /* Ignore the port error if the device
407 } else if (status & UPS_PORT_ENABLED) {
408 device_printf(sc->sc_dev,
409 "illegal enable change, port %d\n", port);
411 /* Port error condition. */
412 if (up->restartcnt) /* no message first time */
413 device_printf(sc->sc_dev,
414 "port error, restarting "
417 if (up->restartcnt++ < USBD_RESTART_MAX)
420 device_printf(sc->sc_dev,
421 "port error, giving up "
425 if (!(change & UPS_C_CONNECT_STATUS)) {
426 DPRINTFN(3,("uhub_explore: port=%d !C_CONNECT_"
428 /* No status change, just do recursive explore. */
429 if (up->device != NULL && up->device->hub != NULL)
430 up->device->hub->explore(up->device);
431 #if 0 && defined(DIAGNOSTIC)
432 if (up->device == NULL &&
433 (status & UPS_CURRENT_CONNECT_STATUS))
434 device_printf(sc->sc_dev,
435 "connected, no device\n");
440 /* We have a connect status change, handle it. */
442 DPRINTF(("uhub_explore: status change hub=%d port=%d\n",
443 dev->address, port));
444 usbd_clear_port_feature(dev, port, UHF_C_PORT_CONNECTION);
445 /*usbd_clear_port_feature(dev, port, UHF_C_PORT_ENABLE);*/
447 * If there is already a device on the port the change status
448 * must mean that is has disconnected. Looking at the
449 * current connect status is not enough to figure this out
450 * since a new unit may have been connected before we handle
454 if (up->device != NULL) {
456 DPRINTF(("uhub_explore: device addr=%d disappeared "
457 "on port %d\n", up->device->address, port));
458 usb_disconnect_port(up, sc->sc_dev);
459 usbd_clear_port_feature(dev, port,
460 UHF_C_PORT_CONNECTION);
462 if (!(status & UPS_CURRENT_CONNECT_STATUS)) {
463 /* Nothing connected, just ignore it. */
464 DPRINTFN(3,("uhub_explore: port=%d !CURRENT_CONNECT"
471 if (!(status & UPS_PORT_POWER))
472 device_printf(sc->sc_dev,
473 "strange, connected port %d has no power\n",
476 /* Wait for maximum device power up time. */
477 usbd_delay_ms(dev, USB_PORT_POWERUP_DELAY);
479 /* Reset port, which implies enabling it. */
480 if (usbd_reset_port(dev, port, &up->status)) {
481 device_printf(sc->sc_dev,
482 "port %d reset failed\n", port);
485 /* Get port status again, it might have changed during reset */
486 err = usbd_get_port_status(dev, port, &up->status);
488 DPRINTF(("uhub_explore: get port status failed, "
489 "error=%s\n", usbd_errstr(err)));
492 status = UGETW(up->status.wPortStatus);
493 change = UGETW(up->status.wPortChange);
494 if (!(status & UPS_CURRENT_CONNECT_STATUS)) {
495 /* Nothing connected, just ignore it. */
497 device_printf(sc->sc_dev,
498 "port %d, device disappeared after reset\n",
505 if (UHUB_IS_HIGH_SPEED(sc) && !(status & UPS_HIGH_SPEED)) {
506 device_printf(sc->sc_dev,
507 "port %d, transaction translation not "
508 "implemented, low/full speed device ignored\n",
514 /* Figure out device speed */
515 if (status & UPS_HIGH_SPEED)
516 speed = USB_SPEED_HIGH;
517 else if (status & UPS_LOW_SPEED)
518 speed = USB_SPEED_LOW;
520 speed = USB_SPEED_FULL;
521 /* Get device info and set its address. */
522 err = usbd_new_device(sc->sc_dev, dev->bus,
523 dev->depth + 1, speed, port, up);
524 /* XXX retry a few times? */
526 DPRINTFN(-1,("uhub_explore: usb_new_device failed, "
527 "error=%s\n", usbd_errstr(err)));
528 /* Avoid addressing problems by disabling. */
529 /* usbd_reset_port(dev, port, &up->status); */
532 * The unit refused to accept a new address, or had
533 * some other serious problem. Since we cannot leave
534 * at 0 we have to disable the port instead.
536 device_printf(sc->sc_dev,
537 "device problem (%s), disabling port %d\n",
538 usbd_errstr(err), port);
539 usbd_clear_port_feature(dev, port, UHF_PORT_ENABLE);
541 /* The port set up succeeded, reset error count. */
545 up->device->hub->explore(up->device);
548 return (USBD_NORMAL_COMPLETION);
552 * Called from process context when the hub is gone.
553 * Detach all devices on active ports.
556 uhub_detach(device_t self)
558 struct uhub_softc *sc = device_get_softc(self);
559 struct usbd_hub *hub = sc->sc_hub->hub;
560 struct usbd_port *rup;
563 DPRINTF(("uhub_detach: sc=%port\n", sc));
567 if (hub == NULL) { /* Must be partially working */
572 usbd_abort_pipe(sc->sc_ipipe);
573 usbd_close_pipe(sc->sc_ipipe);
575 nports = hub->hubdesc.bNbrPorts;
576 for(port = 0; port < nports; port++) {
577 rup = &hub->ports[port];
579 usb_disconnect_port(rup, self);
582 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_hub,
585 if (hub->ports[0].tt)
586 kfree(hub->ports[0].tt, M_USBDEV);
587 kfree(hub, M_USBDEV);
588 sc->sc_hub->hub = NULL;
596 uhub_child_location_str(device_t cbdev, device_t child, char *buf,
599 struct uhub_softc *sc = device_get_softc(cbdev);
600 usbd_device_handle devhub = sc->sc_hub;
601 usbd_device_handle dev;
607 nports = devhub->hub->hubdesc.bNbrPorts;
608 for (port = 0; port < nports; port++) {
609 dev = devhub->hub->ports[port].device;
610 if (dev && dev->subdevs) {
611 for (i = 0; dev->subdevs[i]; i++) {
612 if (dev->subdevs[i] == child) {
613 if (dev->ifacenums == NULL) {
614 ksnprintf(buf, buflen,
617 ksnprintf(buf, buflen,
618 "port=%i interface=%i",
619 port, dev->ifacenums[i]);
626 DPRINTFN(0,("uhub_child_location_str: device not on hub\n"));
634 uhub_child_pnpinfo_str(device_t cbdev, device_t child, char *buf,
637 struct uhub_softc *sc = device_get_softc(cbdev);
638 usbd_device_handle devhub = sc->sc_hub;
639 usbd_device_handle dev;
640 struct usbd_interface *iface;
647 nports = devhub->hub->hubdesc.bNbrPorts;
648 for (port = 0; port < nports; port++) {
649 dev = devhub->hub->ports[port].device;
650 if (dev && dev->subdevs) {
651 for (i = 0; dev->subdevs[i]; i++) {
652 if (dev->subdevs[i] == child) {
658 DPRINTFN(0,("uhub_child_pnpinfo_str: device not on hub\n"));
665 (void)usbd_get_string(dev, dev->ddesc.iSerialNumber, &serial[0]);
666 if (dev->ifacenums == NULL) {
667 ksnprintf(buf, buflen, "vendor=0x%04x product=0x%04x "
668 "devclass=0x%02x devsubclass=0x%02x "
669 "release=0x%04x sernum=\"%s\"",
670 UGETW(dev->ddesc.idVendor), UGETW(dev->ddesc.idProduct),
671 dev->ddesc.bDeviceClass, dev->ddesc.bDeviceSubClass,
672 UGETW(dev->ddesc.bcdDevice), serial);
674 iface = &dev->ifaces[dev->ifacenums[i]];
675 ksnprintf(buf, buflen, "vendor=0x%04x product=0x%04x "
676 "devclass=0x%02x devsubclass=0x%02x "
677 "release=0x%04x sernum=\"%s\" "
678 "intclass=0x%02x intsubclass=0x%02x",
679 UGETW(dev->ddesc.idVendor), UGETW(dev->ddesc.idProduct),
680 dev->ddesc.bDeviceClass, dev->ddesc.bDeviceSubClass,
681 UGETW(dev->ddesc.bcdDevice), serial,
682 iface->idesc->bInterfaceClass,
683 iface->idesc->bInterfaceSubClass);
690 uhub_child_detached(device_t self, device_t child)
692 struct uhub_softc *sc = device_get_softc(self);
693 usbd_device_handle devhub = sc->sc_hub;
694 usbd_device_handle dev = NULL;
695 int nports, port, i = 0;
698 nports = devhub->hub->hubdesc.bNbrPorts;
699 for (port = 0; port < nports; port++) {
700 dev = devhub->hub->ports[port].device;
701 if (dev && dev->subdevs) {
702 for (i = 0; dev->subdevs[i]; ++i) {
703 if (dev->subdevs[i] == child)
713 device_printf(dev->subdevs[i], "at %s", device_get_nameunit(self));
715 kprintf(" port %d", port);
716 kprintf(" (addr %d) disconnected\n", dev->address);
718 kfree(device_get_ivars(dev->subdevs[i]), M_USB);
719 dev->subdevs[i] = NULL;
725 * This an indication that some port has changed status.
726 * Notify the bus event handler thread that we need
727 * to be explored again.
730 uhub_intr(usbd_xfer_handle xfer, usbd_private_handle addr, usbd_status status)
732 struct uhub_softc *sc = addr;
734 DPRINTFN(5,("uhub_intr: sc=%p\n", sc));
735 if (status == USBD_STALLED)
736 usbd_clear_endpoint_stall_async(sc->sc_ipipe);
737 else if (status == USBD_NORMAL_COMPLETION)
738 usb_needs_explore(sc->sc_hub);
741 DRIVER_MODULE(uhub, usb, uhubroot_driver, uhubroot_devclass, 0, 0);
742 DRIVER_MODULE(uhub, uhub, uhub_driver, uhub_devclass, usbd_driver_load, 0);