2 * drivers/usb/core/usb.c
4 * (C) Copyright Linus Torvalds 1999
5 * (C) Copyright Johannes Erdfelt 1999-2001
6 * (C) Copyright Andreas Gal 1999
7 * (C) Copyright Gregory P. Smith 1999
8 * (C) Copyright Deti Fliegl 1999 (new USB architecture)
9 * (C) Copyright Randy Dunlap 2000
10 * (C) Copyright David Brownell 2000-2004
11 * (C) Copyright Yggdrasil Computing, Inc. 2000
12 * (usb_device_id matching changes by Adam J. Richter)
13 * (C) Copyright Greg Kroah-Hartman 2002-2003
15 * NOTE! This is not actually a driver at all, rather this is
16 * just a collection of helper routines that implement the
17 * generic USB things that the real drivers can use..
19 * Think of this as a "USB library" rather than anything else.
20 * It should be considered a slave, with no callbacks. Callbacks
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/string.h>
27 #include <linux/bitops.h>
28 #include <linux/slab.h>
29 #include <linux/interrupt.h> /* for in_interrupt() */
30 #include <linux/kmod.h>
31 #include <linux/init.h>
32 #include <linux/spinlock.h>
33 #include <linux/errno.h>
34 #include <linux/usb.h>
35 #include <linux/usb/hcd.h>
36 #include <linux/mutex.h>
37 #include <linux/workqueue.h>
38 #include <linux/debugfs.h>
41 #include <linux/scatterlist.h>
43 #include <linux/dma-mapping.h>
48 const char *usbcore_name
= "usbcore";
50 static int nousb
; /* Disable USB when built into kernel image */
52 #ifdef CONFIG_USB_SUSPEND
53 static int usb_autosuspend_delay
= 2; /* Default delay value,
55 module_param_named(autosuspend
, usb_autosuspend_delay
, int, 0644);
56 MODULE_PARM_DESC(autosuspend
, "default autosuspend delay");
59 #define usb_autosuspend_delay 0
64 * usb_find_alt_setting() - Given a configuration, find the alternate setting
65 * for the given interface.
66 * @config: the configuration to search (not necessarily the current config).
67 * @iface_num: interface number to search in
68 * @alt_num: alternate interface setting number to search for.
70 * Search the configuration's interface cache for the given alt setting.
72 struct usb_host_interface
*usb_find_alt_setting(
73 struct usb_host_config
*config
,
74 unsigned int iface_num
,
77 struct usb_interface_cache
*intf_cache
= NULL
;
80 for (i
= 0; i
< config
->desc
.bNumInterfaces
; i
++) {
81 if (config
->intf_cache
[i
]->altsetting
[0].desc
.bInterfaceNumber
83 intf_cache
= config
->intf_cache
[i
];
89 for (i
= 0; i
< intf_cache
->num_altsetting
; i
++)
90 if (intf_cache
->altsetting
[i
].desc
.bAlternateSetting
== alt_num
)
91 return &intf_cache
->altsetting
[i
];
93 printk(KERN_DEBUG
"Did not find alt setting %u for intf %u, "
94 "config %u\n", alt_num
, iface_num
,
95 config
->desc
.bConfigurationValue
);
98 EXPORT_SYMBOL_GPL(usb_find_alt_setting
);
101 * usb_ifnum_to_if - get the interface object with a given interface number
102 * @dev: the device whose current configuration is considered
103 * @ifnum: the desired interface
105 * This walks the device descriptor for the currently active configuration
106 * and returns a pointer to the interface with that particular interface
109 * Note that configuration descriptors are not required to assign interface
110 * numbers sequentially, so that it would be incorrect to assume that
111 * the first interface in that descriptor corresponds to interface zero.
112 * This routine helps device drivers avoid such mistakes.
113 * However, you should make sure that you do the right thing with any
114 * alternate settings available for this interfaces.
116 * Don't call this function unless you are bound to one of the interfaces
117 * on this device or you have locked the device!
119 struct usb_interface
*usb_ifnum_to_if(const struct usb_device
*dev
,
122 struct usb_host_config
*config
= dev
->actconfig
;
127 for (i
= 0; i
< config
->desc
.bNumInterfaces
; i
++)
128 if (config
->interface
[i
]->altsetting
[0]
129 .desc
.bInterfaceNumber
== ifnum
)
130 return config
->interface
[i
];
134 EXPORT_SYMBOL_GPL(usb_ifnum_to_if
);
137 * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number.
138 * @intf: the interface containing the altsetting in question
139 * @altnum: the desired alternate setting number
141 * This searches the altsetting array of the specified interface for
142 * an entry with the correct bAlternateSetting value and returns a pointer
143 * to that entry, or null.
145 * Note that altsettings need not be stored sequentially by number, so
146 * it would be incorrect to assume that the first altsetting entry in
147 * the array corresponds to altsetting zero. This routine helps device
148 * drivers avoid such mistakes.
150 * Don't call this function unless you are bound to the intf interface
151 * or you have locked the device!
153 struct usb_host_interface
*usb_altnum_to_altsetting(
154 const struct usb_interface
*intf
,
159 for (i
= 0; i
< intf
->num_altsetting
; i
++) {
160 if (intf
->altsetting
[i
].desc
.bAlternateSetting
== altnum
)
161 return &intf
->altsetting
[i
];
165 EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting
);
167 struct find_interface_arg
{
169 struct device_driver
*drv
;
172 static int __find_interface(struct device
*dev
, void *data
)
174 struct find_interface_arg
*arg
= data
;
175 struct usb_interface
*intf
;
177 if (!is_usb_interface(dev
))
180 if (dev
->driver
!= arg
->drv
)
182 intf
= to_usb_interface(dev
);
183 return intf
->minor
== arg
->minor
;
187 * usb_find_interface - find usb_interface pointer for driver and device
188 * @drv: the driver whose current configuration is considered
189 * @minor: the minor number of the desired device
191 * This walks the bus device list and returns a pointer to the interface
192 * with the matching minor and driver. Note, this only works for devices
193 * that share the USB major number.
195 struct usb_interface
*usb_find_interface(struct usb_driver
*drv
, int minor
)
197 struct find_interface_arg argb
;
201 argb
.drv
= &drv
->drvwrap
.driver
;
203 dev
= bus_find_device(&usb_bus_type
, NULL
, &argb
, __find_interface
);
205 /* Drop reference count from bus_find_device */
208 return dev
? to_usb_interface(dev
) : NULL
;
210 EXPORT_SYMBOL_GPL(usb_find_interface
);
213 * usb_release_dev - free a usb device structure when all users of it are finished.
214 * @dev: device that's been disconnected
216 * Will be called only by the device core when all users of this usb device are
219 static void usb_release_dev(struct device
*dev
)
221 struct usb_device
*udev
;
224 udev
= to_usb_device(dev
);
225 hcd
= bus_to_hcd(udev
->bus
);
227 usb_destroy_configuration(udev
);
229 kfree(udev
->product
);
230 kfree(udev
->manufacturer
);
235 #ifdef CONFIG_HOTPLUG
236 static int usb_dev_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
238 struct usb_device
*usb_dev
;
240 usb_dev
= to_usb_device(dev
);
242 if (add_uevent_var(env
, "BUSNUM=%03d", usb_dev
->bus
->busnum
))
245 if (add_uevent_var(env
, "DEVNUM=%03d", usb_dev
->devnum
))
253 static int usb_dev_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
257 #endif /* CONFIG_HOTPLUG */
261 /* USB device Power-Management thunks.
262 * There's no need to distinguish here between quiescing a USB device
263 * and powering it down; the generic_suspend() routine takes care of
264 * it by skipping the usb_port_suspend() call for a quiesce. And for
265 * USB interfaces there's no difference at all.
268 static int usb_dev_prepare(struct device
*dev
)
270 return 0; /* Implement eventually? */
273 static void usb_dev_complete(struct device
*dev
)
275 /* Currently used only for rebinding interfaces */
276 usb_resume(dev
, PMSG_ON
);
279 static int usb_dev_suspend(struct device
*dev
)
281 return usb_suspend(dev
, PMSG_SUSPEND
);
284 static int usb_dev_resume(struct device
*dev
)
286 return usb_resume(dev
, PMSG_RESUME
);
289 static int usb_dev_freeze(struct device
*dev
)
291 return usb_suspend(dev
, PMSG_FREEZE
);
294 static int usb_dev_thaw(struct device
*dev
)
296 return usb_resume(dev
, PMSG_THAW
);
299 static int usb_dev_poweroff(struct device
*dev
)
301 return usb_suspend(dev
, PMSG_HIBERNATE
);
304 static int usb_dev_restore(struct device
*dev
)
306 return usb_resume(dev
, PMSG_RESTORE
);
309 static const struct dev_pm_ops usb_device_pm_ops
= {
310 .prepare
= usb_dev_prepare
,
311 .complete
= usb_dev_complete
,
312 .suspend
= usb_dev_suspend
,
313 .resume
= usb_dev_resume
,
314 .freeze
= usb_dev_freeze
,
315 .thaw
= usb_dev_thaw
,
316 .poweroff
= usb_dev_poweroff
,
317 .restore
= usb_dev_restore
,
320 #endif /* CONFIG_PM */
323 static char *usb_devnode(struct device
*dev
, mode_t
*mode
)
325 struct usb_device
*usb_dev
;
327 usb_dev
= to_usb_device(dev
);
328 return kasprintf(GFP_KERNEL
, "bus/usb/%03d/%03d",
329 usb_dev
->bus
->busnum
, usb_dev
->devnum
);
332 struct device_type usb_device_type
= {
333 .name
= "usb_device",
334 .release
= usb_release_dev
,
335 .uevent
= usb_dev_uevent
,
336 .devnode
= usb_devnode
,
338 .pm
= &usb_device_pm_ops
,
343 /* Returns 1 if @usb_bus is WUSB, 0 otherwise */
344 static unsigned usb_bus_is_wusb(struct usb_bus
*bus
)
346 struct usb_hcd
*hcd
= container_of(bus
, struct usb_hcd
, self
);
347 return hcd
->wireless
;
352 * usb_alloc_dev - usb device constructor (usbcore-internal)
353 * @parent: hub to which device is connected; null to allocate a root hub
354 * @bus: bus used to access the device
355 * @port1: one-based index of port; ignored for root hubs
356 * Context: !in_interrupt()
358 * Only hub drivers (including virtual root hub drivers for host
359 * controllers) should ever call this.
361 * This call may not be used in a non-sleeping context.
363 struct usb_device
*usb_alloc_dev(struct usb_device
*parent
,
364 struct usb_bus
*bus
, unsigned port1
)
366 struct usb_device
*dev
;
367 struct usb_hcd
*usb_hcd
= container_of(bus
, struct usb_hcd
, self
);
368 unsigned root_hub
= 0;
370 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
374 if (!usb_get_hcd(bus_to_hcd(bus
))) {
378 /* Root hubs aren't true devices, so don't allocate HCD resources */
379 if (usb_hcd
->driver
->alloc_dev
&& parent
&&
380 !usb_hcd
->driver
->alloc_dev(usb_hcd
, dev
)) {
381 usb_put_hcd(bus_to_hcd(bus
));
386 device_initialize(&dev
->dev
);
387 dev
->dev
.bus
= &usb_bus_type
;
388 dev
->dev
.type
= &usb_device_type
;
389 dev
->dev
.groups
= usb_device_groups
;
390 dev
->dev
.dma_mask
= bus
->controller
->dma_mask
;
391 set_dev_node(&dev
->dev
, dev_to_node(bus
->controller
));
392 dev
->state
= USB_STATE_ATTACHED
;
393 atomic_set(&dev
->urbnum
, 0);
395 INIT_LIST_HEAD(&dev
->ep0
.urb_list
);
396 dev
->ep0
.desc
.bLength
= USB_DT_ENDPOINT_SIZE
;
397 dev
->ep0
.desc
.bDescriptorType
= USB_DT_ENDPOINT
;
398 /* ep0 maxpacket comes later, from device descriptor */
399 usb_enable_endpoint(dev
, &dev
->ep0
, false);
402 /* Save readable and stable topology id, distinguishing devices
403 * by location for diagnostics, tools, driver model, etc. The
404 * string is a path along hub ports, from the root. Each device's
405 * dev->devpath will be stable until USB is re-cabled, and hubs
406 * are often labeled with these port numbers. The name isn't
407 * as stable: bus->busnum changes easily from modprobe order,
408 * cardbus or pci hotplugging, and so on.
410 if (unlikely(!parent
)) {
411 dev
->devpath
[0] = '0';
414 dev
->dev
.parent
= bus
->controller
;
415 dev_set_name(&dev
->dev
, "usb%d", bus
->busnum
);
418 /* match any labeling on the hubs; it's one-based */
419 if (parent
->devpath
[0] == '0') {
420 snprintf(dev
->devpath
, sizeof dev
->devpath
,
422 /* Root ports are not counted in route string */
425 snprintf(dev
->devpath
, sizeof dev
->devpath
,
426 "%s.%d", parent
->devpath
, port1
);
427 /* Route string assumes hubs have less than 16 ports */
429 dev
->route
= parent
->route
+
430 (port1
<< ((parent
->level
- 1)*4));
432 dev
->route
= parent
->route
+
433 (15 << ((parent
->level
- 1)*4));
436 dev
->dev
.parent
= &parent
->dev
;
437 dev_set_name(&dev
->dev
, "%d-%s", bus
->busnum
, dev
->devpath
);
439 /* hub driver sets up TT records */
442 dev
->portnum
= port1
;
444 dev
->parent
= parent
;
445 INIT_LIST_HEAD(&dev
->filelist
);
448 dev
->autosuspend_delay
= usb_autosuspend_delay
* HZ
;
449 dev
->connect_time
= jiffies
;
450 dev
->active_duration
= -jiffies
;
452 if (root_hub
) /* Root hub always ok [and always wired] */
455 dev
->authorized
= usb_hcd
->authorized_default
;
456 dev
->wusb
= usb_bus_is_wusb(bus
)? 1 : 0;
462 * usb_get_dev - increments the reference count of the usb device structure
463 * @dev: the device being referenced
465 * Each live reference to a device should be refcounted.
467 * Drivers for USB interfaces should normally record such references in
468 * their probe() methods, when they bind to an interface, and release
469 * them by calling usb_put_dev(), in their disconnect() methods.
471 * A pointer to the device with the incremented reference counter is returned.
473 struct usb_device
*usb_get_dev(struct usb_device
*dev
)
476 get_device(&dev
->dev
);
479 EXPORT_SYMBOL_GPL(usb_get_dev
);
482 * usb_put_dev - release a use of the usb device structure
483 * @dev: device that's been disconnected
485 * Must be called when a user of a device is finished with it. When the last
486 * user of the device calls this function, the memory of the device is freed.
488 void usb_put_dev(struct usb_device
*dev
)
491 put_device(&dev
->dev
);
493 EXPORT_SYMBOL_GPL(usb_put_dev
);
496 * usb_get_intf - increments the reference count of the usb interface structure
497 * @intf: the interface being referenced
499 * Each live reference to a interface must be refcounted.
501 * Drivers for USB interfaces should normally record such references in
502 * their probe() methods, when they bind to an interface, and release
503 * them by calling usb_put_intf(), in their disconnect() methods.
505 * A pointer to the interface with the incremented reference counter is
508 struct usb_interface
*usb_get_intf(struct usb_interface
*intf
)
511 get_device(&intf
->dev
);
514 EXPORT_SYMBOL_GPL(usb_get_intf
);
517 * usb_put_intf - release a use of the usb interface structure
518 * @intf: interface that's been decremented
520 * Must be called when a user of an interface is finished with it. When the
521 * last user of the interface calls this function, the memory of the interface
524 void usb_put_intf(struct usb_interface
*intf
)
527 put_device(&intf
->dev
);
529 EXPORT_SYMBOL_GPL(usb_put_intf
);
531 /* USB device locking
533 * USB devices and interfaces are locked using the semaphore in their
534 * embedded struct device. The hub driver guarantees that whenever a
535 * device is connected or disconnected, drivers are called with the
536 * USB device locked as well as their particular interface.
538 * Complications arise when several devices are to be locked at the same
539 * time. Only hub-aware drivers that are part of usbcore ever have to
540 * do this; nobody else needs to worry about it. The rule for locking
543 * When locking both a device and its parent, always lock the
548 * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure
549 * @udev: device that's being locked
550 * @iface: interface bound to the driver making the request (optional)
552 * Attempts to acquire the device lock, but fails if the device is
553 * NOTATTACHED or SUSPENDED, or if iface is specified and the interface
554 * is neither BINDING nor BOUND. Rather than sleeping to wait for the
555 * lock, the routine polls repeatedly. This is to prevent deadlock with
556 * disconnect; in some drivers (such as usb-storage) the disconnect()
557 * or suspend() method will block waiting for a device reset to complete.
559 * Returns a negative error code for failure, otherwise 0.
561 int usb_lock_device_for_reset(struct usb_device
*udev
,
562 const struct usb_interface
*iface
)
564 unsigned long jiffies_expire
= jiffies
+ HZ
;
566 if (udev
->state
== USB_STATE_NOTATTACHED
)
568 if (udev
->state
== USB_STATE_SUSPENDED
)
569 return -EHOSTUNREACH
;
570 if (iface
&& (iface
->condition
== USB_INTERFACE_UNBINDING
||
571 iface
->condition
== USB_INTERFACE_UNBOUND
))
574 while (!usb_trylock_device(udev
)) {
576 /* If we can't acquire the lock after waiting one second,
577 * we're probably deadlocked */
578 if (time_after(jiffies
, jiffies_expire
))
582 if (udev
->state
== USB_STATE_NOTATTACHED
)
584 if (udev
->state
== USB_STATE_SUSPENDED
)
585 return -EHOSTUNREACH
;
586 if (iface
&& (iface
->condition
== USB_INTERFACE_UNBINDING
||
587 iface
->condition
== USB_INTERFACE_UNBOUND
))
592 EXPORT_SYMBOL_GPL(usb_lock_device_for_reset
);
595 * usb_get_current_frame_number - return current bus frame number
596 * @dev: the device whose bus is being queried
598 * Returns the current frame number for the USB host controller
599 * used with the given USB device. This can be used when scheduling
600 * isochronous requests.
602 * Note that different kinds of host controller have different
603 * "scheduling horizons". While one type might support scheduling only
604 * 32 frames into the future, others could support scheduling up to
605 * 1024 frames into the future.
607 int usb_get_current_frame_number(struct usb_device
*dev
)
609 return usb_hcd_get_frame_number(dev
);
611 EXPORT_SYMBOL_GPL(usb_get_current_frame_number
);
613 /*-------------------------------------------------------------------*/
615 * __usb_get_extra_descriptor() finds a descriptor of specific type in the
616 * extra field of the interface and endpoint descriptor structs.
619 int __usb_get_extra_descriptor(char *buffer
, unsigned size
,
620 unsigned char type
, void **ptr
)
622 struct usb_descriptor_header
*header
;
624 while (size
>= sizeof(struct usb_descriptor_header
)) {
625 header
= (struct usb_descriptor_header
*)buffer
;
627 if (header
->bLength
< 2) {
629 "%s: bogus descriptor, type %d length %d\n",
631 header
->bDescriptorType
,
636 if (header
->bDescriptorType
== type
) {
641 buffer
+= header
->bLength
;
642 size
-= header
->bLength
;
646 EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor
);
649 * usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
650 * @dev: device the buffer will be used with
651 * @size: requested buffer size
652 * @mem_flags: affect whether allocation may block
653 * @dma: used to return DMA address of buffer
655 * Return value is either null (indicating no buffer could be allocated), or
656 * the cpu-space pointer to a buffer that may be used to perform DMA to the
657 * specified device. Such cpu-space buffers are returned along with the DMA
658 * address (through the pointer provided).
660 * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags
661 * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU
662 * hardware during URB completion/resubmit. The implementation varies between
663 * platforms, depending on details of how DMA will work to this device.
664 * Using these buffers also eliminates cacheline sharing problems on
665 * architectures where CPU caches are not DMA-coherent. On systems without
666 * bus-snooping caches, these buffers are uncached.
668 * When the buffer is no longer used, free it with usb_free_coherent().
670 void *usb_alloc_coherent(struct usb_device
*dev
, size_t size
, gfp_t mem_flags
,
673 if (!dev
|| !dev
->bus
)
675 return hcd_buffer_alloc(dev
->bus
, size
, mem_flags
, dma
);
677 EXPORT_SYMBOL_GPL(usb_alloc_coherent
);
680 * usb_free_coherent - free memory allocated with usb_alloc_coherent()
681 * @dev: device the buffer was used with
682 * @size: requested buffer size
683 * @addr: CPU address of buffer
684 * @dma: DMA address of buffer
686 * This reclaims an I/O buffer, letting it be reused. The memory must have
687 * been allocated using usb_alloc_coherent(), and the parameters must match
688 * those provided in that allocation request.
690 void usb_free_coherent(struct usb_device
*dev
, size_t size
, void *addr
,
693 if (!dev
|| !dev
->bus
)
697 hcd_buffer_free(dev
->bus
, size
, addr
, dma
);
699 EXPORT_SYMBOL_GPL(usb_free_coherent
);
702 * usb_buffer_map - create DMA mapping(s) for an urb
703 * @urb: urb whose transfer_buffer/setup_packet will be mapped
705 * Return value is either null (indicating no buffer could be mapped), or
706 * the parameter. URB_NO_TRANSFER_DMA_MAP is
707 * added to urb->transfer_flags if the operation succeeds. If the device
708 * is connected to this system through a non-DMA controller, this operation
711 * This call would normally be used for an urb which is reused, perhaps
712 * as the target of a large periodic transfer, with usb_buffer_dmasync()
713 * calls to synchronize memory and dma state.
715 * Reverse the effect of this call with usb_buffer_unmap().
720 * usb_buffer_unmap - free DMA mapping(s) for an urb
721 * @urb: urb whose transfer_buffer will be unmapped
723 * Reverses the effect of usb_buffer_map().
729 /* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */
731 module_param(nousb
, bool, 0444);
733 core_param(nousb
, nousb
, bool, 0444);
737 * for external read access to <nousb>
739 int usb_disabled(void)
743 EXPORT_SYMBOL_GPL(usb_disabled
);
746 * Notifications of device and interface registration
748 static int usb_bus_notify(struct notifier_block
*nb
, unsigned long action
,
751 struct device
*dev
= data
;
754 case BUS_NOTIFY_ADD_DEVICE
:
755 if (dev
->type
== &usb_device_type
)
756 (void) usb_create_sysfs_dev_files(to_usb_device(dev
));
757 else if (dev
->type
== &usb_if_device_type
)
758 (void) usb_create_sysfs_intf_files(
759 to_usb_interface(dev
));
762 case BUS_NOTIFY_DEL_DEVICE
:
763 if (dev
->type
== &usb_device_type
)
764 usb_remove_sysfs_dev_files(to_usb_device(dev
));
765 else if (dev
->type
== &usb_if_device_type
)
766 usb_remove_sysfs_intf_files(to_usb_interface(dev
));
772 static struct notifier_block usb_bus_nb
= {
773 .notifier_call
= usb_bus_notify
,
776 struct dentry
*usb_debug_root
;
777 EXPORT_SYMBOL_GPL(usb_debug_root
);
779 static struct dentry
*usb_debug_devices
;
781 static int usb_debugfs_init(void)
783 usb_debug_root
= debugfs_create_dir("usb", NULL
);
787 usb_debug_devices
= debugfs_create_file("devices", 0444,
788 usb_debug_root
, NULL
,
789 &usbfs_devices_fops
);
790 if (!usb_debug_devices
) {
791 debugfs_remove(usb_debug_root
);
792 usb_debug_root
= NULL
;
799 static void usb_debugfs_cleanup(void)
801 debugfs_remove(usb_debug_devices
);
802 debugfs_remove(usb_debug_root
);
808 static int __init
usb_init(void)
812 pr_info("%s: USB support disabled\n", usbcore_name
);
816 retval
= usb_debugfs_init();
820 retval
= bus_register(&usb_bus_type
);
822 goto bus_register_failed
;
823 retval
= bus_register_notifier(&usb_bus_type
, &usb_bus_nb
);
825 goto bus_notifier_failed
;
826 retval
= usb_major_init();
828 goto major_init_failed
;
829 retval
= usb_register(&usbfs_driver
);
831 goto driver_register_failed
;
832 retval
= usb_devio_init();
834 goto usb_devio_init_failed
;
835 retval
= usbfs_init();
838 retval
= usb_hub_init();
840 goto hub_init_failed
;
841 retval
= usb_register_device_driver(&usb_generic_driver
, THIS_MODULE
);
850 usb_devio_init_failed
:
851 usb_deregister(&usbfs_driver
);
852 driver_register_failed
:
855 bus_unregister_notifier(&usb_bus_type
, &usb_bus_nb
);
857 bus_unregister(&usb_bus_type
);
859 usb_debugfs_cleanup();
867 static void __exit
usb_exit(void)
869 /* This will matter if shutdown/reboot does exitcalls. */
873 usb_deregister_device_driver(&usb_generic_driver
);
876 usb_deregister(&usbfs_driver
);
879 bus_unregister_notifier(&usb_bus_type
, &usb_bus_nb
);
880 bus_unregister(&usb_bus_type
);
881 usb_debugfs_cleanup();
884 subsys_initcall(usb_init
);
885 module_exit(usb_exit
);
886 MODULE_LICENSE("GPL");