3 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/stdint.h>
30 #include <sys/stddef.h>
31 #include <sys/param.h>
32 #include <sys/queue.h>
33 #include <sys/types.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/module.h>
39 #include <sys/mutex.h>
40 #include <sys/condvar.h>
41 #include <sys/sysctl.h>
43 #include <sys/unistd.h>
44 #include <sys/callout.h>
45 #include <sys/malloc.h>
48 #include <dev/usb/usb.h>
49 #include <dev/usb/usbdi.h>
51 #define USB_DEBUG_VAR usb_ctrl_debug
53 #include <dev/usb/usb_core.h>
54 #include <dev/usb/usb_debug.h>
55 #include <dev/usb/usb_process.h>
56 #include <dev/usb/usb_busdma.h>
57 #include <dev/usb/usb_dynamic.h>
58 #include <dev/usb/usb_device.h>
59 #include <dev/usb/usb_hub.h>
61 #include <dev/usb/usb_controller.h>
62 #include <dev/usb/usb_bus.h>
63 #include <dev/usb/usb_pf.h>
66 /* function prototypes */
68 static device_probe_t usb_probe;
69 static device_attach_t usb_attach;
70 static device_detach_t usb_detach;
71 static device_suspend_t usb_suspend;
72 static device_resume_t usb_resume;
73 static device_shutdown_t usb_shutdown;
75 static void usb_attach_sub(device_t, struct usb_bus *);
77 /* static variables */
80 static int usb_ctrl_debug = 0;
82 static SYSCTL_NODE(_hw_usb, OID_AUTO, ctrl, CTLFLAG_RW, 0, "USB controller");
83 SYSCTL_INT(_hw_usb_ctrl, OID_AUTO, debug, CTLFLAG_RW, &usb_ctrl_debug, 0,
87 static int usb_no_boot_wait = 0;
88 TUNABLE_INT("hw.usb.no_boot_wait", &usb_no_boot_wait);
89 SYSCTL_INT(_hw_usb, OID_AUTO, no_boot_wait, CTLFLAG_RD|CTLFLAG_TUN, &usb_no_boot_wait, 0,
90 "No USB device enumerate waiting at boot.");
92 static int usb_no_suspend_wait = 0;
93 TUNABLE_INT("hw.usb.no_suspend_wait", &usb_no_suspend_wait);
94 SYSCTL_INT(_hw_usb, OID_AUTO, no_suspend_wait, CTLFLAG_RW|CTLFLAG_TUN,
95 &usb_no_suspend_wait, 0, "No USB device waiting at system suspend.");
97 static int usb_no_shutdown_wait = 0;
98 TUNABLE_INT("hw.usb.no_shutdown_wait", &usb_no_shutdown_wait);
99 SYSCTL_INT(_hw_usb, OID_AUTO, no_shutdown_wait, CTLFLAG_RW|CTLFLAG_TUN,
100 &usb_no_shutdown_wait, 0, "No USB device waiting at system shutdown.");
102 static devclass_t usb_devclass;
104 static device_method_t usb_methods[] = {
105 DEVMETHOD(device_probe, usb_probe),
106 DEVMETHOD(device_attach, usb_attach),
107 DEVMETHOD(device_detach, usb_detach),
108 DEVMETHOD(device_suspend, usb_suspend),
109 DEVMETHOD(device_resume, usb_resume),
110 DEVMETHOD(device_shutdown, usb_shutdown),
114 static driver_t usb_driver = {
116 .methods = usb_methods,
120 /* Host Only Drivers */
121 DRIVER_MODULE(usbus, ohci, usb_driver, usb_devclass, 0, 0);
122 DRIVER_MODULE(usbus, uhci, usb_driver, usb_devclass, 0, 0);
123 DRIVER_MODULE(usbus, ehci, usb_driver, usb_devclass, 0, 0);
124 DRIVER_MODULE(usbus, xhci, usb_driver, usb_devclass, 0, 0);
126 /* Device Only Drivers */
127 DRIVER_MODULE(usbus, at91_udp, usb_driver, usb_devclass, 0, 0);
128 DRIVER_MODULE(usbus, musbotg, usb_driver, usb_devclass, 0, 0);
129 DRIVER_MODULE(usbus, uss820, usb_driver, usb_devclass, 0, 0);
131 /*------------------------------------------------------------------------*
134 * This function is called from "{ehci,ohci,uhci}_pci_attach()".
135 *------------------------------------------------------------------------*/
137 usb_probe(device_t dev)
144 usb_root_mount_rel(struct usb_bus *bus)
146 if (bus->bus_roothold != NULL) {
147 DPRINTF("Releasing root mount hold %p\n", bus->bus_roothold);
148 root_mount_rel(bus->bus_roothold);
149 bus->bus_roothold = NULL;
153 /*------------------------------------------------------------------------*
155 *------------------------------------------------------------------------*/
157 usb_attach(device_t dev)
159 struct usb_bus *bus = device_get_ivars(dev);
164 device_printf(dev, "USB device has no ivars\n");
168 if (usb_no_boot_wait == 0) {
169 /* delay vfs_mountroot until the bus is explored */
170 bus->bus_roothold = root_mount_hold(device_get_nameunit(dev));
173 usb_attach_sub(dev, bus);
175 return (0); /* return success */
178 /*------------------------------------------------------------------------*
180 *------------------------------------------------------------------------*/
182 usb_detach(device_t dev)
184 struct usb_bus *bus = device_get_softc(dev);
189 /* was never setup properly */
192 /* Stop power watchdog */
193 usb_callout_drain(&bus->power_wdog);
195 /* Let the USB explore process detach all devices. */
196 usb_root_mount_rel(bus);
200 /* Queue detach job */
201 usb_proc_msignal(&bus->explore_proc,
202 &bus->detach_msg[0], &bus->detach_msg[1]);
204 /* Wait for detach to complete */
205 usb_proc_mwait(&bus->explore_proc,
206 &bus->detach_msg[0], &bus->detach_msg[1]);
210 /* Get rid of USB callback processes */
212 usb_proc_free(&bus->giant_callback_proc);
213 usb_proc_free(&bus->non_giant_callback_proc);
215 /* Get rid of USB explore process */
217 usb_proc_free(&bus->explore_proc);
219 /* Get rid of control transfer process */
221 usb_proc_free(&bus->control_xfer_proc);
229 /*------------------------------------------------------------------------*
231 *------------------------------------------------------------------------*/
233 usb_suspend(device_t dev)
235 struct usb_bus *bus = device_get_softc(dev);
240 /* was never setup properly */
245 usb_proc_msignal(&bus->explore_proc,
246 &bus->suspend_msg[0], &bus->suspend_msg[1]);
247 if (usb_no_suspend_wait == 0) {
248 /* wait for suspend callback to be executed */
249 usb_proc_mwait(&bus->explore_proc,
250 &bus->suspend_msg[0], &bus->suspend_msg[1]);
257 /*------------------------------------------------------------------------*
259 *------------------------------------------------------------------------*/
261 usb_resume(device_t dev)
263 struct usb_bus *bus = device_get_softc(dev);
268 /* was never setup properly */
273 usb_proc_msignal(&bus->explore_proc,
274 &bus->resume_msg[0], &bus->resume_msg[1]);
280 /*------------------------------------------------------------------------*
282 *------------------------------------------------------------------------*/
284 usb_shutdown(device_t dev)
286 struct usb_bus *bus = device_get_softc(dev);
291 /* was never setup properly */
295 device_printf(bus->bdev, "Controller shutdown\n");
298 usb_proc_msignal(&bus->explore_proc,
299 &bus->shutdown_msg[0], &bus->shutdown_msg[1]);
300 if (usb_no_shutdown_wait == 0) {
301 /* wait for shutdown callback to be executed */
302 usb_proc_mwait(&bus->explore_proc,
303 &bus->shutdown_msg[0], &bus->shutdown_msg[1]);
307 device_printf(bus->bdev, "Controller shutdown complete\n");
312 /*------------------------------------------------------------------------*
315 * This function is used to explore the device tree from the root.
316 *------------------------------------------------------------------------*/
318 usb_bus_explore(struct usb_proc_msg *pm)
321 struct usb_device *udev;
323 bus = ((struct usb_bus_msg *)pm)->bus;
324 udev = bus->devices[USB_ROOT_HUB_ADDR];
326 if (bus->no_explore != 0)
329 if (udev && udev->hub) {
333 bus->driver_added_refcount++;
335 if (bus->driver_added_refcount == 0) {
336 /* avoid zero, hence that is memory default */
337 bus->driver_added_refcount = 1;
342 * The following three lines of code are only here to
345 usb_proc_rewakeup(&bus->control_xfer_proc);
346 usb_proc_rewakeup(&bus->giant_callback_proc);
347 usb_proc_rewakeup(&bus->non_giant_callback_proc);
354 * First update the USB power state!
358 /* Explore the Root USB HUB. */
359 (udev->hub->explore) (udev);
362 usb_root_mount_rel(bus);
365 /*------------------------------------------------------------------------*
368 * This function is used to detach the device tree from the root.
369 *------------------------------------------------------------------------*/
371 usb_bus_detach(struct usb_proc_msg *pm)
374 struct usb_device *udev;
377 bus = ((struct usb_bus_msg *)pm)->bus;
378 udev = bus->devices[USB_ROOT_HUB_ADDR];
380 /* clear the softc */
381 device_set_softc(dev, NULL);
384 /* detach children first */
386 bus_generic_detach(dev);
390 * Free USB device and all subdevices, if any.
392 usb_free_device(udev, 0);
395 /* clear bdev variable last */
399 /*------------------------------------------------------------------------*
402 * This function is used to suspend the USB contoller.
403 *------------------------------------------------------------------------*/
405 usb_bus_suspend(struct usb_proc_msg *pm)
408 struct usb_device *udev;
412 bus = ((struct usb_bus_msg *)pm)->bus;
413 udev = bus->devices[USB_ROOT_HUB_ADDR];
415 if (udev == NULL || bus->bdev == NULL)
421 * We use the shutdown event here because the suspend and
422 * resume events are reserved for the USB port suspend and
423 * resume. The USB system suspend is implemented like full
424 * shutdown and all connected USB devices will be disconnected
425 * subsequently. At resume all USB devices will be
426 * re-connected again.
429 bus_generic_shutdown(bus->bdev);
431 do_unlock = usbd_enum_lock(udev);
433 err = usbd_set_config_index(udev, USB_UNCONFIG_INDEX);
435 device_printf(bus->bdev, "Could not unconfigure root HUB\n");
438 bus->hw_power_state = 0;
442 if (bus->methods->set_hw_power != NULL)
443 (bus->methods->set_hw_power) (bus);
445 if (bus->methods->set_hw_power_sleep != NULL)
446 (bus->methods->set_hw_power_sleep) (bus, USB_HW_POWER_SUSPEND);
449 usbd_enum_unlock(udev);
454 /*------------------------------------------------------------------------*
457 * This function is used to resume the USB contoller.
458 *------------------------------------------------------------------------*/
460 usb_bus_resume(struct usb_proc_msg *pm)
463 struct usb_device *udev;
467 bus = ((struct usb_bus_msg *)pm)->bus;
468 udev = bus->devices[USB_ROOT_HUB_ADDR];
470 if (udev == NULL || bus->bdev == NULL)
475 do_unlock = usbd_enum_lock(udev);
477 DEVMETHOD(usb_take_controller, NULL); /* dummy */
479 USB_TAKE_CONTROLLER(device_get_parent(bus->bdev));
482 bus->hw_power_state =
483 USB_HW_POWER_CONTROL |
485 USB_HW_POWER_INTERRUPT |
487 USB_HW_POWER_NON_ROOT_HUB;
491 if (bus->methods->set_hw_power_sleep != NULL)
492 (bus->methods->set_hw_power_sleep) (bus, USB_HW_POWER_RESUME);
494 if (bus->methods->set_hw_power != NULL)
495 (bus->methods->set_hw_power) (bus);
497 /* restore USB configuration to index 0 */
498 err = usbd_set_config_index(udev, 0);
500 device_printf(bus->bdev, "Could not configure root HUB\n");
502 /* probe and attach */
503 err = usb_probe_and_attach(udev, USB_IFACE_INDEX_ANY);
505 device_printf(bus->bdev, "Could not probe and "
506 "attach root HUB\n");
510 usbd_enum_unlock(udev);
515 /*------------------------------------------------------------------------*
518 * This function is used to shutdown the USB contoller.
519 *------------------------------------------------------------------------*/
521 usb_bus_shutdown(struct usb_proc_msg *pm)
524 struct usb_device *udev;
528 bus = ((struct usb_bus_msg *)pm)->bus;
529 udev = bus->devices[USB_ROOT_HUB_ADDR];
531 if (udev == NULL || bus->bdev == NULL)
536 bus_generic_shutdown(bus->bdev);
538 do_unlock = usbd_enum_lock(udev);
540 err = usbd_set_config_index(udev, USB_UNCONFIG_INDEX);
542 device_printf(bus->bdev, "Could not unconfigure root HUB\n");
545 bus->hw_power_state = 0;
549 if (bus->methods->set_hw_power != NULL)
550 (bus->methods->set_hw_power) (bus);
552 if (bus->methods->set_hw_power_sleep != NULL)
553 (bus->methods->set_hw_power_sleep) (bus, USB_HW_POWER_SHUTDOWN);
556 usbd_enum_unlock(udev);
562 usb_power_wdog(void *arg)
564 struct usb_bus *bus = arg;
566 USB_BUS_LOCK_ASSERT(bus, MA_OWNED);
568 usb_callout_reset(&bus->power_wdog,
569 4 * hz, usb_power_wdog, arg);
573 * The following line of code is only here to recover from
576 usb_proc_rewakeup(&bus->explore_proc); /* recover from DDB */
582 usb_bus_power_update(bus);
588 /*------------------------------------------------------------------------*
591 * This function attaches USB in context of the explore thread.
592 *------------------------------------------------------------------------*/
594 usb_bus_attach(struct usb_proc_msg *pm)
597 struct usb_device *child;
600 enum usb_dev_speed speed;
602 bus = ((struct usb_bus_msg *)pm)->bus;
607 switch (bus->usbrev) {
609 speed = USB_SPEED_FULL;
610 device_printf(bus->bdev, "12Mbps Full Speed USB v1.0\n");
614 speed = USB_SPEED_FULL;
615 device_printf(bus->bdev, "12Mbps Full Speed USB v1.1\n");
619 speed = USB_SPEED_HIGH;
620 device_printf(bus->bdev, "480Mbps High Speed USB v2.0\n");
624 speed = USB_SPEED_VARIABLE;
625 device_printf(bus->bdev, "480Mbps Wireless USB v2.5\n");
629 speed = USB_SPEED_SUPER;
630 device_printf(bus->bdev, "5.0Gbps Super Speed USB v3.0\n");
634 device_printf(bus->bdev, "Unsupported USB revision\n");
635 usb_root_mount_rel(bus);
639 /* default power_mask value */
640 bus->hw_power_state =
641 USB_HW_POWER_CONTROL |
643 USB_HW_POWER_INTERRUPT |
645 USB_HW_POWER_NON_ROOT_HUB;
649 /* make sure power is set at least once */
651 if (bus->methods->set_hw_power != NULL) {
652 (bus->methods->set_hw_power) (bus);
655 /* allocate the Root USB device */
657 child = usb_alloc_device(bus->bdev, bus, NULL, 0, 0, 1,
658 speed, USB_MODE_HOST);
660 err = usb_probe_and_attach(child,
661 USB_IFACE_INDEX_ANY);
663 if ((bus->devices[USB_ROOT_HUB_ADDR] == NULL) ||
664 (bus->devices[USB_ROOT_HUB_ADDR]->hub == NULL)) {
665 err = USB_ERR_NO_ROOT_HUB;
675 device_printf(bus->bdev, "Root HUB problem, error=%s\n",
677 usb_root_mount_rel(bus);
680 /* set softc - we are ready */
681 device_set_softc(dev, bus);
687 /*------------------------------------------------------------------------*
690 * This function creates a thread which runs the USB attach code.
691 *------------------------------------------------------------------------*/
693 usb_attach_sub(device_t dev, struct usb_bus *bus)
695 const char *pname = device_get_nameunit(dev);
698 if (usb_devclass_ptr == NULL)
699 usb_devclass_ptr = devclass_find("usbus");
705 /* Initialise USB process messages */
706 bus->explore_msg[0].hdr.pm_callback = &usb_bus_explore;
707 bus->explore_msg[0].bus = bus;
708 bus->explore_msg[1].hdr.pm_callback = &usb_bus_explore;
709 bus->explore_msg[1].bus = bus;
711 bus->detach_msg[0].hdr.pm_callback = &usb_bus_detach;
712 bus->detach_msg[0].bus = bus;
713 bus->detach_msg[1].hdr.pm_callback = &usb_bus_detach;
714 bus->detach_msg[1].bus = bus;
716 bus->attach_msg[0].hdr.pm_callback = &usb_bus_attach;
717 bus->attach_msg[0].bus = bus;
718 bus->attach_msg[1].hdr.pm_callback = &usb_bus_attach;
719 bus->attach_msg[1].bus = bus;
721 bus->suspend_msg[0].hdr.pm_callback = &usb_bus_suspend;
722 bus->suspend_msg[0].bus = bus;
723 bus->suspend_msg[1].hdr.pm_callback = &usb_bus_suspend;
724 bus->suspend_msg[1].bus = bus;
726 bus->resume_msg[0].hdr.pm_callback = &usb_bus_resume;
727 bus->resume_msg[0].bus = bus;
728 bus->resume_msg[1].hdr.pm_callback = &usb_bus_resume;
729 bus->resume_msg[1].bus = bus;
731 bus->shutdown_msg[0].hdr.pm_callback = &usb_bus_shutdown;
732 bus->shutdown_msg[0].bus = bus;
733 bus->shutdown_msg[1].hdr.pm_callback = &usb_bus_shutdown;
734 bus->shutdown_msg[1].bus = bus;
736 /* Create USB explore and callback processes */
738 if (usb_proc_create(&bus->giant_callback_proc,
739 &bus->bus_mtx, pname, USB_PRI_MED)) {
740 device_printf(dev, "WARNING: Creation of USB Giant "
741 "callback process failed.\n");
742 } else if (usb_proc_create(&bus->non_giant_callback_proc,
743 &bus->bus_mtx, pname, USB_PRI_HIGH)) {
744 device_printf(dev, "WARNING: Creation of USB non-Giant "
745 "callback process failed.\n");
746 } else if (usb_proc_create(&bus->explore_proc,
747 &bus->bus_mtx, pname, USB_PRI_MED)) {
748 device_printf(dev, "WARNING: Creation of USB explore "
749 "process failed.\n");
750 } else if (usb_proc_create(&bus->control_xfer_proc,
751 &bus->bus_mtx, pname, USB_PRI_MED)) {
752 device_printf(dev, "WARNING: Creation of USB control transfer "
753 "process failed.\n");
755 /* Get final attach going */
757 usb_proc_msignal(&bus->explore_proc,
758 &bus->attach_msg[0], &bus->attach_msg[1]);
761 /* Do initial explore */
762 usb_needs_explore(bus, 1);
766 SYSUNINIT(usb_bus_unload, SI_SUB_KLD, SI_ORDER_ANY, usb_bus_unload, NULL);
768 /*------------------------------------------------------------------------*
769 * usb_bus_mem_flush_all_cb
770 *------------------------------------------------------------------------*/
773 usb_bus_mem_flush_all_cb(struct usb_bus *bus, struct usb_page_cache *pc,
774 struct usb_page *pg, usb_size_t size, usb_size_t align)
776 usb_pc_cpu_flush(pc);
780 /*------------------------------------------------------------------------*
781 * usb_bus_mem_flush_all - factored out code
782 *------------------------------------------------------------------------*/
785 usb_bus_mem_flush_all(struct usb_bus *bus, usb_bus_mem_cb_t *cb)
788 cb(bus, &usb_bus_mem_flush_all_cb);
793 /*------------------------------------------------------------------------*
794 * usb_bus_mem_alloc_all_cb
795 *------------------------------------------------------------------------*/
798 usb_bus_mem_alloc_all_cb(struct usb_bus *bus, struct usb_page_cache *pc,
799 struct usb_page *pg, usb_size_t size, usb_size_t align)
801 /* need to initialize the page cache */
802 pc->tag_parent = bus->dma_parent_tag;
804 if (usb_pc_alloc_mem(pc, pg, size, align)) {
805 bus->alloc_failed = 1;
810 /*------------------------------------------------------------------------*
811 * usb_bus_mem_alloc_all - factored out code
816 *------------------------------------------------------------------------*/
818 usb_bus_mem_alloc_all(struct usb_bus *bus, bus_dma_tag_t dmat,
819 usb_bus_mem_cb_t *cb)
821 bus->alloc_failed = 0;
823 mtx_init(&bus->bus_mtx, device_get_nameunit(bus->parent),
824 NULL, MTX_DEF | MTX_RECURSE);
826 usb_callout_init_mtx(&bus->power_wdog,
829 TAILQ_INIT(&bus->intr_q.head);
832 usb_dma_tag_setup(bus->dma_parent_tag, bus->dma_tags,
833 dmat, &bus->bus_mtx, NULL, 32, USB_BUS_DMA_TAG_MAX);
835 if ((bus->devices_max > USB_MAX_DEVICES) ||
836 (bus->devices_max < USB_MIN_DEVICES) ||
837 (bus->devices == NULL)) {
838 DPRINTFN(0, "Devices field has not been "
839 "initialised properly\n");
840 bus->alloc_failed = 1; /* failure */
844 cb(bus, &usb_bus_mem_alloc_all_cb);
847 if (bus->alloc_failed) {
848 usb_bus_mem_free_all(bus, cb);
850 return (bus->alloc_failed);
853 /*------------------------------------------------------------------------*
854 * usb_bus_mem_free_all_cb
855 *------------------------------------------------------------------------*/
858 usb_bus_mem_free_all_cb(struct usb_bus *bus, struct usb_page_cache *pc,
859 struct usb_page *pg, usb_size_t size, usb_size_t align)
865 /*------------------------------------------------------------------------*
866 * usb_bus_mem_free_all - factored out code
867 *------------------------------------------------------------------------*/
869 usb_bus_mem_free_all(struct usb_bus *bus, usb_bus_mem_cb_t *cb)
873 cb(bus, &usb_bus_mem_free_all_cb);
875 usb_dma_tag_unsetup(bus->dma_parent_tag);
878 mtx_destroy(&bus->bus_mtx);
881 /* convenience wrappers */
883 usb_proc_explore_mwait(struct usb_device *udev, void *pm1, void *pm2)
885 usb_proc_mwait(&udev->bus->explore_proc, pm1, pm2);
889 usb_proc_explore_msignal(struct usb_device *udev, void *pm1, void *pm2)
891 return (usb_proc_msignal(&udev->bus->explore_proc, pm1, pm2));
895 usb_proc_explore_lock(struct usb_device *udev)
897 USB_BUS_LOCK(udev->bus);
901 usb_proc_explore_unlock(struct usb_device *udev)
903 USB_BUS_UNLOCK(udev->bus);