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/config.h>
26 #ifdef CONFIG_USB_DEBUG
32 #include <linux/module.h>
33 #include <linux/string.h>
34 #include <linux/bitops.h>
35 #include <linux/slab.h>
36 #include <linux/interrupt.h> /* for in_interrupt() */
37 #include <linux/kmod.h>
38 #include <linux/init.h>
39 #include <linux/spinlock.h>
40 #include <linux/errno.h>
41 #include <linux/smp_lock.h>
42 #include <linux/rwsem.h>
43 #include <linux/usb.h>
46 #include <asm/scatterlist.h>
48 #include <linux/dma-mapping.h>
53 extern int usb_hub_init(void);
54 extern void usb_hub_cleanup(void);
55 extern int usb_major_init(void);
56 extern void usb_major_cleanup(void);
57 extern int usb_host_init(void);
58 extern void usb_host_cleanup(void);
61 const char *usbcore_name
= "usbcore";
63 static int nousb
; /* Disable USB when built into kernel image */
64 /* Not honored on modular build */
66 static DECLARE_RWSEM(usb_all_devices_rwsem
);
69 static int generic_probe (struct device
*dev
)
73 static int generic_remove (struct device
*dev
)
78 static struct device_driver usb_generic_driver
= {
82 .probe
= generic_probe
,
83 .remove
= generic_remove
,
86 static int usb_generic_driver_data
;
88 /* called from driver core with usb_bus_type.subsys writelock */
89 static int usb_probe_interface(struct device
*dev
)
91 struct usb_interface
* intf
= to_usb_interface(dev
);
92 struct usb_driver
* driver
= to_usb_driver(dev
->driver
);
93 const struct usb_device_id
*id
;
96 dev_dbg(dev
, "%s\n", __FUNCTION__
);
100 /* FIXME we'd much prefer to just resume it ... */
101 if (interface_to_usbdev(intf
)->state
== USB_STATE_SUSPENDED
)
102 return -EHOSTUNREACH
;
104 id
= usb_match_id (intf
, driver
->id_table
);
106 dev_dbg (dev
, "%s - got id\n", __FUNCTION__
);
107 intf
->condition
= USB_INTERFACE_BINDING
;
108 error
= driver
->probe (intf
, id
);
109 intf
->condition
= error
? USB_INTERFACE_UNBOUND
:
116 /* called from driver core with usb_bus_type.subsys writelock */
117 static int usb_unbind_interface(struct device
*dev
)
119 struct usb_interface
*intf
= to_usb_interface(dev
);
120 struct usb_driver
*driver
= to_usb_driver(intf
->dev
.driver
);
122 intf
->condition
= USB_INTERFACE_UNBINDING
;
124 /* release all urbs for this interface */
125 usb_disable_interface(interface_to_usbdev(intf
), intf
);
127 if (driver
&& driver
->disconnect
)
128 driver
->disconnect(intf
);
130 /* reset other interface state */
131 usb_set_interface(interface_to_usbdev(intf
),
132 intf
->altsetting
[0].desc
.bInterfaceNumber
,
134 usb_set_intfdata(intf
, NULL
);
135 intf
->condition
= USB_INTERFACE_UNBOUND
;
141 * usb_register - register a USB driver
142 * @new_driver: USB operations for the driver
144 * Registers a USB driver with the USB core. The list of unattached
145 * interfaces will be rescanned whenever a new driver is added, allowing
146 * the new driver to attach to any recognized devices.
147 * Returns a negative error code on failure and 0 on success.
149 * NOTE: if you want your driver to use the USB major number, you must call
150 * usb_register_dev() to enable that functionality. This function no longer
151 * takes care of that.
153 int usb_register(struct usb_driver
*new_driver
)
160 new_driver
->driver
.name
= (char *)new_driver
->name
;
161 new_driver
->driver
.bus
= &usb_bus_type
;
162 new_driver
->driver
.probe
= usb_probe_interface
;
163 new_driver
->driver
.remove
= usb_unbind_interface
;
164 new_driver
->driver
.owner
= new_driver
->owner
;
166 usb_lock_all_devices();
167 retval
= driver_register(&new_driver
->driver
);
168 usb_unlock_all_devices();
171 pr_info("%s: registered new driver %s\n",
172 usbcore_name
, new_driver
->name
);
173 usbfs_update_special();
175 printk(KERN_ERR
"%s: error %d registering driver %s\n",
176 usbcore_name
, retval
, new_driver
->name
);
183 * usb_deregister - unregister a USB driver
184 * @driver: USB operations of the driver to unregister
185 * Context: must be able to sleep
187 * Unlinks the specified driver from the internal USB driver list.
189 * NOTE: If you called usb_register_dev(), you still need to call
190 * usb_deregister_dev() to clean up your driver's allocated minor numbers,
191 * this * call will no longer do it for you.
193 void usb_deregister(struct usb_driver
*driver
)
195 pr_info("%s: deregistering driver %s\n", usbcore_name
, driver
->name
);
197 usb_lock_all_devices();
198 driver_unregister (&driver
->driver
);
199 usb_unlock_all_devices();
201 usbfs_update_special();
205 * usb_ifnum_to_if - get the interface object with a given interface number
206 * @dev: the device whose current configuration is considered
207 * @ifnum: the desired interface
209 * This walks the device descriptor for the currently active configuration
210 * and returns a pointer to the interface with that particular interface
213 * Note that configuration descriptors are not required to assign interface
214 * numbers sequentially, so that it would be incorrect to assume that
215 * the first interface in that descriptor corresponds to interface zero.
216 * This routine helps device drivers avoid such mistakes.
217 * However, you should make sure that you do the right thing with any
218 * alternate settings available for this interfaces.
220 * Don't call this function unless you are bound to one of the interfaces
221 * on this device or you have locked the device!
223 struct usb_interface
*usb_ifnum_to_if(struct usb_device
*dev
, unsigned ifnum
)
225 struct usb_host_config
*config
= dev
->actconfig
;
230 for (i
= 0; i
< config
->desc
.bNumInterfaces
; i
++)
231 if (config
->interface
[i
]->altsetting
[0]
232 .desc
.bInterfaceNumber
== ifnum
)
233 return config
->interface
[i
];
239 * usb_altnum_to_altsetting - get the altsetting structure with a given
240 * alternate setting number.
241 * @intf: the interface containing the altsetting in question
242 * @altnum: the desired alternate setting number
244 * This searches the altsetting array of the specified interface for
245 * an entry with the correct bAlternateSetting value and returns a pointer
246 * to that entry, or null.
248 * Note that altsettings need not be stored sequentially by number, so
249 * it would be incorrect to assume that the first altsetting entry in
250 * the array corresponds to altsetting zero. This routine helps device
251 * drivers avoid such mistakes.
253 * Don't call this function unless you are bound to the intf interface
254 * or you have locked the device!
256 struct usb_host_interface
*usb_altnum_to_altsetting(struct usb_interface
*intf
,
261 for (i
= 0; i
< intf
->num_altsetting
; i
++) {
262 if (intf
->altsetting
[i
].desc
.bAlternateSetting
== altnum
)
263 return &intf
->altsetting
[i
];
269 * usb_driver_claim_interface - bind a driver to an interface
270 * @driver: the driver to be bound
271 * @iface: the interface to which it will be bound; must be in the
272 * usb device's active configuration
273 * @priv: driver data associated with that interface
275 * This is used by usb device drivers that need to claim more than one
276 * interface on a device when probing (audio and acm are current examples).
277 * No device driver should directly modify internal usb_interface or
278 * usb_device structure members.
280 * Few drivers should need to use this routine, since the most natural
281 * way to bind to an interface is to return the private data from
282 * the driver's probe() method.
284 * Callers must own the device lock and the driver model's usb_bus_type.subsys
285 * writelock. So driver probe() entries don't need extra locking,
286 * but other call contexts may need to explicitly claim those locks.
288 int usb_driver_claim_interface(struct usb_driver
*driver
,
289 struct usb_interface
*iface
, void* priv
)
291 struct device
*dev
= &iface
->dev
;
296 dev
->driver
= &driver
->driver
;
297 usb_set_intfdata(iface
, priv
);
298 iface
->condition
= USB_INTERFACE_BOUND
;
300 /* if interface was already added, bind now; else let
301 * the future device_add() bind it, bypassing probe()
303 if (!list_empty (&dev
->bus_list
))
304 device_bind_driver(dev
);
310 * usb_driver_release_interface - unbind a driver from an interface
311 * @driver: the driver to be unbound
312 * @iface: the interface from which it will be unbound
314 * This can be used by drivers to release an interface without waiting
315 * for their disconnect() methods to be called. In typical cases this
316 * also causes the driver disconnect() method to be called.
318 * This call is synchronous, and may not be used in an interrupt context.
319 * Callers must own the device lock and the driver model's usb_bus_type.subsys
320 * writelock. So driver disconnect() entries don't need extra locking,
321 * but other call contexts may need to explicitly claim those locks.
323 void usb_driver_release_interface(struct usb_driver
*driver
,
324 struct usb_interface
*iface
)
326 struct device
*dev
= &iface
->dev
;
328 /* this should never happen, don't release something that's not ours */
329 if (!dev
->driver
|| dev
->driver
!= &driver
->driver
)
332 /* don't disconnect from disconnect(), or before dev_add() */
333 if (!list_empty (&dev
->driver_list
) && !list_empty (&dev
->bus_list
))
334 device_release_driver(dev
);
337 usb_set_intfdata(iface
, NULL
);
338 iface
->condition
= USB_INTERFACE_UNBOUND
;
342 * usb_match_id - find first usb_device_id matching device or interface
343 * @interface: the interface of interest
344 * @id: array of usb_device_id structures, terminated by zero entry
346 * usb_match_id searches an array of usb_device_id's and returns
347 * the first one matching the device or interface, or null.
348 * This is used when binding (or rebinding) a driver to an interface.
349 * Most USB device drivers will use this indirectly, through the usb core,
350 * but some layered driver frameworks use it directly.
351 * These device tables are exported with MODULE_DEVICE_TABLE, through
352 * modutils and "modules.usbmap", to support the driver loading
353 * functionality of USB hotplugging.
357 * The "match_flags" element in a usb_device_id controls which
358 * members are used. If the corresponding bit is set, the
359 * value in the device_id must match its corresponding member
360 * in the device or interface descriptor, or else the device_id
363 * "driver_info" is normally used only by device drivers,
364 * but you can create a wildcard "matches anything" usb_device_id
365 * as a driver's "modules.usbmap" entry if you provide an id with
366 * only a nonzero "driver_info" field. If you do this, the USB device
367 * driver's probe() routine should use additional intelligence to
368 * decide whether to bind to the specified interface.
370 * What Makes Good usb_device_id Tables:
372 * The match algorithm is very simple, so that intelligence in
373 * driver selection must come from smart driver id records.
374 * Unless you have good reasons to use another selection policy,
375 * provide match elements only in related groups, and order match
376 * specifiers from specific to general. Use the macros provided
377 * for that purpose if you can.
379 * The most specific match specifiers use device descriptor
380 * data. These are commonly used with product-specific matches;
381 * the USB_DEVICE macro lets you provide vendor and product IDs,
382 * and you can also match against ranges of product revisions.
383 * These are widely used for devices with application or vendor
384 * specific bDeviceClass values.
386 * Matches based on device class/subclass/protocol specifications
387 * are slightly more general; use the USB_DEVICE_INFO macro, or
388 * its siblings. These are used with single-function devices
389 * where bDeviceClass doesn't specify that each interface has
392 * Matches based on interface class/subclass/protocol are the
393 * most general; they let drivers bind to any interface on a
394 * multiple-function device. Use the USB_INTERFACE_INFO
395 * macro, or its siblings, to match class-per-interface style
396 * devices (as recorded in bDeviceClass).
398 * Within those groups, remember that not all combinations are
399 * meaningful. For example, don't give a product version range
400 * without vendor and product IDs; or specify a protocol without
401 * its associated class and subclass.
403 const struct usb_device_id
*
404 usb_match_id(struct usb_interface
*interface
, const struct usb_device_id
*id
)
406 struct usb_host_interface
*intf
;
407 struct usb_device
*dev
;
409 /* proc_connectinfo in devio.c may call us with id == NULL. */
413 intf
= interface
->cur_altsetting
;
414 dev
= interface_to_usbdev(interface
);
416 /* It is important to check that id->driver_info is nonzero,
417 since an entry that is all zeroes except for a nonzero
418 id->driver_info is the way to create an entry that
419 indicates that the driver want to examine every
420 device and interface. */
421 for (; id
->idVendor
|| id
->bDeviceClass
|| id
->bInterfaceClass
||
422 id
->driver_info
; id
++) {
424 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_VENDOR
) &&
425 id
->idVendor
!= le16_to_cpu(dev
->descriptor
.idVendor
))
428 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_PRODUCT
) &&
429 id
->idProduct
!= le16_to_cpu(dev
->descriptor
.idProduct
))
432 /* No need to test id->bcdDevice_lo != 0, since 0 is never
433 greater than any unsigned number. */
434 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_LO
) &&
435 (id
->bcdDevice_lo
> le16_to_cpu(dev
->descriptor
.bcdDevice
)))
438 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_HI
) &&
439 (id
->bcdDevice_hi
< le16_to_cpu(dev
->descriptor
.bcdDevice
)))
442 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_CLASS
) &&
443 (id
->bDeviceClass
!= dev
->descriptor
.bDeviceClass
))
446 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_SUBCLASS
) &&
447 (id
->bDeviceSubClass
!= dev
->descriptor
.bDeviceSubClass
))
450 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_PROTOCOL
) &&
451 (id
->bDeviceProtocol
!= dev
->descriptor
.bDeviceProtocol
))
454 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_CLASS
) &&
455 (id
->bInterfaceClass
!= intf
->desc
.bInterfaceClass
))
458 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_SUBCLASS
) &&
459 (id
->bInterfaceSubClass
!= intf
->desc
.bInterfaceSubClass
))
462 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_PROTOCOL
) &&
463 (id
->bInterfaceProtocol
!= intf
->desc
.bInterfaceProtocol
))
473 * usb_find_interface - find usb_interface pointer for driver and device
474 * @drv: the driver whose current configuration is considered
475 * @minor: the minor number of the desired device
477 * This walks the driver device list and returns a pointer to the interface
478 * with the matching minor. Note, this only works for devices that share the
481 struct usb_interface
*usb_find_interface(struct usb_driver
*drv
, int minor
)
483 struct list_head
*entry
;
485 struct usb_interface
*intf
;
487 list_for_each(entry
, &drv
->driver
.devices
) {
488 dev
= container_of(entry
, struct device
, driver_list
);
490 /* can't look at usb devices, only interfaces */
491 if (dev
->driver
== &usb_generic_driver
)
494 intf
= to_usb_interface(dev
);
495 if (intf
->minor
== -1)
497 if (intf
->minor
== minor
)
501 /* no device found that matches */
505 static int usb_device_match (struct device
*dev
, struct device_driver
*drv
)
507 struct usb_interface
*intf
;
508 struct usb_driver
*usb_drv
;
509 const struct usb_device_id
*id
;
511 /* check for generic driver, which we don't match any device with */
512 if (drv
== &usb_generic_driver
)
515 intf
= to_usb_interface(dev
);
516 usb_drv
= to_usb_driver(drv
);
518 id
= usb_match_id (intf
, usb_drv
->id_table
);
526 #ifdef CONFIG_HOTPLUG
529 * USB hotplugging invokes what /proc/sys/kernel/hotplug says
530 * (normally /sbin/hotplug) when USB devices get added or removed.
532 * This invokes a user mode policy agent, typically helping to load driver
533 * or other modules, configure the device, and more. Drivers can provide
534 * a MODULE_DEVICE_TABLE to help with module loading subtasks.
536 * We're called either from khubd (the typical case) or from root hub
537 * (init, kapmd, modprobe, rmmod, etc), but the agents need to handle
538 * delays in event delivery. Use sysfs (and DEVPATH) to make sure the
539 * device (and this configuration!) are still present.
541 static int usb_hotplug (struct device
*dev
, char **envp
, int num_envp
,
542 char *buffer
, int buffer_size
)
544 struct usb_interface
*intf
;
545 struct usb_device
*usb_dev
;
552 /* driver is often null here; dev_dbg() would oops */
553 pr_debug ("usb %s: hotplug\n", dev
->bus_id
);
555 /* Must check driver_data here, as on remove driver is always NULL */
556 if ((dev
->driver
== &usb_generic_driver
) ||
557 (dev
->driver_data
== &usb_generic_driver_data
))
560 intf
= to_usb_interface(dev
);
561 usb_dev
= interface_to_usbdev (intf
);
563 if (usb_dev
->devnum
< 0) {
564 pr_debug ("usb %s: already deleted?\n", dev
->bus_id
);
568 pr_debug ("usb %s: bus removed?\n", dev
->bus_id
);
572 #ifdef CONFIG_USB_DEVICEFS
573 /* If this is available, userspace programs can directly read
574 * all the device descriptors we don't tell them about. Or
575 * even act as usermode drivers.
577 * FIXME reduce hardwired intelligence here
579 if (add_hotplug_env_var(envp
, num_envp
, &i
,
580 buffer
, buffer_size
, &length
,
581 "DEVICE=/proc/bus/usb/%03d/%03d",
582 usb_dev
->bus
->busnum
, usb_dev
->devnum
))
586 /* per-device configurations are common */
587 if (add_hotplug_env_var(envp
, num_envp
, &i
,
588 buffer
, buffer_size
, &length
,
590 le16_to_cpu(usb_dev
->descriptor
.idVendor
),
591 le16_to_cpu(usb_dev
->descriptor
.idProduct
),
592 le16_to_cpu(usb_dev
->descriptor
.bcdDevice
)))
595 /* class-based driver binding models */
596 if (add_hotplug_env_var(envp
, num_envp
, &i
,
597 buffer
, buffer_size
, &length
,
599 usb_dev
->descriptor
.bDeviceClass
,
600 usb_dev
->descriptor
.bDeviceSubClass
,
601 usb_dev
->descriptor
.bDeviceProtocol
))
604 if (usb_dev
->descriptor
.bDeviceClass
== 0) {
605 struct usb_host_interface
*alt
= intf
->cur_altsetting
;
607 /* 2.4 only exposed interface zero. in 2.5, hotplug
608 * agents are called for all interfaces, and can use
609 * $DEVPATH/bInterfaceNumber if necessary.
611 if (add_hotplug_env_var(envp
, num_envp
, &i
,
612 buffer
, buffer_size
, &length
,
613 "INTERFACE=%d/%d/%d",
614 alt
->desc
.bInterfaceClass
,
615 alt
->desc
.bInterfaceSubClass
,
616 alt
->desc
.bInterfaceProtocol
))
619 if (add_hotplug_env_var(envp
, num_envp
, &i
,
620 buffer
, buffer_size
, &length
,
621 "MODALIAS=usb:v%04Xp%04Xdl%04Xdh%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X",
622 le16_to_cpu(usb_dev
->descriptor
.idVendor
),
623 le16_to_cpu(usb_dev
->descriptor
.idProduct
),
624 le16_to_cpu(usb_dev
->descriptor
.bcdDevice
),
625 le16_to_cpu(usb_dev
->descriptor
.bcdDevice
),
626 usb_dev
->descriptor
.bDeviceClass
,
627 usb_dev
->descriptor
.bDeviceSubClass
,
628 usb_dev
->descriptor
.bDeviceProtocol
,
629 alt
->desc
.bInterfaceClass
,
630 alt
->desc
.bInterfaceSubClass
,
631 alt
->desc
.bInterfaceProtocol
))
634 if (add_hotplug_env_var(envp
, num_envp
, &i
,
635 buffer
, buffer_size
, &length
,
636 "MODALIAS=usb:v%04Xp%04Xdl%04Xdh%04Xdc%02Xdsc%02Xdp%02Xic*isc*ip*",
637 le16_to_cpu(usb_dev
->descriptor
.idVendor
),
638 le16_to_cpu(usb_dev
->descriptor
.idProduct
),
639 le16_to_cpu(usb_dev
->descriptor
.bcdDevice
),
640 le16_to_cpu(usb_dev
->descriptor
.bcdDevice
),
641 usb_dev
->descriptor
.bDeviceClass
,
642 usb_dev
->descriptor
.bDeviceSubClass
,
643 usb_dev
->descriptor
.bDeviceProtocol
))
654 static int usb_hotplug (struct device
*dev
, char **envp
,
655 int num_envp
, char *buffer
, int buffer_size
)
660 #endif /* CONFIG_HOTPLUG */
663 * usb_release_dev - free a usb device structure when all users of it are finished.
664 * @dev: device that's been disconnected
666 * Will be called only by the device core when all users of this usb device are
669 static void usb_release_dev(struct device
*dev
)
671 struct usb_device
*udev
;
673 udev
= to_usb_device(dev
);
675 usb_destroy_configuration(udev
);
676 usb_bus_put(udev
->bus
);
677 kfree(udev
->product
);
678 kfree(udev
->manufacturer
);
684 * usb_alloc_dev - usb device constructor (usbcore-internal)
685 * @parent: hub to which device is connected; null to allocate a root hub
686 * @bus: bus used to access the device
687 * @port1: one-based index of port; ignored for root hubs
688 * Context: !in_interrupt ()
690 * Only hub drivers (including virtual root hub drivers for host
691 * controllers) should ever call this.
693 * This call may not be used in a non-sleeping context.
696 usb_alloc_dev(struct usb_device
*parent
, struct usb_bus
*bus
, unsigned port1
)
698 struct usb_device
*dev
;
700 dev
= kmalloc(sizeof(*dev
), GFP_KERNEL
);
704 memset(dev
, 0, sizeof(*dev
));
706 bus
= usb_bus_get(bus
);
712 device_initialize(&dev
->dev
);
713 dev
->dev
.bus
= &usb_bus_type
;
714 dev
->dev
.dma_mask
= bus
->controller
->dma_mask
;
715 dev
->dev
.driver_data
= &usb_generic_driver_data
;
716 dev
->dev
.driver
= &usb_generic_driver
;
717 dev
->dev
.release
= usb_release_dev
;
718 dev
->state
= USB_STATE_ATTACHED
;
720 INIT_LIST_HEAD(&dev
->ep0
.urb_list
);
721 dev
->ep0
.desc
.bLength
= USB_DT_ENDPOINT_SIZE
;
722 dev
->ep0
.desc
.bDescriptorType
= USB_DT_ENDPOINT
;
723 /* ep0 maxpacket comes later, from device descriptor */
724 dev
->ep_in
[0] = dev
->ep_out
[0] = &dev
->ep0
;
726 /* Save readable and stable topology id, distinguishing devices
727 * by location for diagnostics, tools, driver model, etc. The
728 * string is a path along hub ports, from the root. Each device's
729 * dev->devpath will be stable until USB is re-cabled, and hubs
730 * are often labeled with these port numbers. The bus_id isn't
731 * as stable: bus->busnum changes easily from modprobe order,
732 * cardbus or pci hotplugging, and so on.
734 if (unlikely (!parent
)) {
735 dev
->devpath
[0] = '0';
737 dev
->dev
.parent
= bus
->controller
;
738 sprintf (&dev
->dev
.bus_id
[0], "usb%d", bus
->busnum
);
740 /* match any labeling on the hubs; it's one-based */
741 if (parent
->devpath
[0] == '0')
742 snprintf (dev
->devpath
, sizeof dev
->devpath
,
745 snprintf (dev
->devpath
, sizeof dev
->devpath
,
746 "%s.%d", parent
->devpath
, port1
);
748 dev
->dev
.parent
= &parent
->dev
;
749 sprintf (&dev
->dev
.bus_id
[0], "%d-%s",
750 bus
->busnum
, dev
->devpath
);
752 /* hub driver sets up TT records */
756 dev
->parent
= parent
;
757 INIT_LIST_HEAD(&dev
->filelist
);
759 init_MUTEX(&dev
->serialize
);
765 * usb_get_dev - increments the reference count of the usb device structure
766 * @dev: the device being referenced
768 * Each live reference to a device should be refcounted.
770 * Drivers for USB interfaces should normally record such references in
771 * their probe() methods, when they bind to an interface, and release
772 * them by calling usb_put_dev(), in their disconnect() methods.
774 * A pointer to the device with the incremented reference counter is returned.
776 struct usb_device
*usb_get_dev(struct usb_device
*dev
)
779 get_device(&dev
->dev
);
784 * usb_put_dev - release a use of the usb device structure
785 * @dev: device that's been disconnected
787 * Must be called when a user of a device is finished with it. When the last
788 * user of the device calls this function, the memory of the device is freed.
790 void usb_put_dev(struct usb_device
*dev
)
793 put_device(&dev
->dev
);
797 * usb_get_intf - increments the reference count of the usb interface structure
798 * @intf: the interface being referenced
800 * Each live reference to a interface must be refcounted.
802 * Drivers for USB interfaces should normally record such references in
803 * their probe() methods, when they bind to an interface, and release
804 * them by calling usb_put_intf(), in their disconnect() methods.
806 * A pointer to the interface with the incremented reference counter is
809 struct usb_interface
*usb_get_intf(struct usb_interface
*intf
)
812 get_device(&intf
->dev
);
817 * usb_put_intf - release a use of the usb interface structure
818 * @intf: interface that's been decremented
820 * Must be called when a user of an interface is finished with it. When the
821 * last user of the interface calls this function, the memory of the interface
824 void usb_put_intf(struct usb_interface
*intf
)
827 put_device(&intf
->dev
);
831 /* USB device locking
833 * Although locking USB devices should be straightforward, it is
834 * complicated by the way the driver-model core works. When a new USB
835 * driver is registered or unregistered, the core will automatically
836 * probe or disconnect all matching interfaces on all USB devices while
837 * holding the USB subsystem writelock. There's no good way for us to
838 * tell which devices will be used or to lock them beforehand; our only
839 * option is to effectively lock all the USB devices.
841 * We do that by using a private rw-semaphore, usb_all_devices_rwsem.
842 * When locking an individual device you must first acquire the rwsem's
843 * readlock. When a driver is registered or unregistered the writelock
844 * must be held. These actions are encapsulated in the subroutines
845 * below, so all a driver needs to do is call usb_lock_device() and
846 * usb_unlock_device().
848 * Complications arise when several devices are to be locked at the same
849 * time. Only hub-aware drivers that are part of usbcore ever have to
850 * do this; nobody else needs to worry about it. The problem is that
851 * usb_lock_device() must not be called to lock a second device since it
852 * would acquire the rwsem's readlock reentrantly, leading to deadlock if
853 * another thread was waiting for the writelock. The solution is simple:
855 * When locking more than one device, call usb_lock_device()
856 * to lock the first one. Lock the others by calling
857 * down(&udev->serialize) directly.
859 * When unlocking multiple devices, use up(&udev->serialize)
860 * to unlock all but the last one. Unlock the last one by
861 * calling usb_unlock_device().
863 * When locking both a device and its parent, always lock the
868 * usb_lock_device - acquire the lock for a usb device structure
869 * @udev: device that's being locked
871 * Use this routine when you don't hold any other device locks;
872 * to acquire nested inner locks call down(&udev->serialize) directly.
873 * This is necessary for proper interaction with usb_lock_all_devices().
875 void usb_lock_device(struct usb_device
*udev
)
877 down_read(&usb_all_devices_rwsem
);
878 down(&udev
->serialize
);
882 * usb_trylock_device - attempt to acquire the lock for a usb device structure
883 * @udev: device that's being locked
885 * Don't use this routine if you already hold a device lock;
886 * use down_trylock(&udev->serialize) instead.
887 * This is necessary for proper interaction with usb_lock_all_devices().
889 * Returns 1 if successful, 0 if contention.
891 int usb_trylock_device(struct usb_device
*udev
)
893 if (!down_read_trylock(&usb_all_devices_rwsem
))
895 if (down_trylock(&udev
->serialize
)) {
896 up_read(&usb_all_devices_rwsem
);
903 * usb_lock_device_for_reset - cautiously acquire the lock for a
904 * usb device structure
905 * @udev: device that's being locked
906 * @iface: interface bound to the driver making the request (optional)
908 * Attempts to acquire the device lock, but fails if the device is
909 * NOTATTACHED or SUSPENDED, or if iface is specified and the interface
910 * is neither BINDING nor BOUND. Rather than sleeping to wait for the
911 * lock, the routine polls repeatedly. This is to prevent deadlock with
912 * disconnect; in some drivers (such as usb-storage) the disconnect()
913 * callback will block waiting for a device reset to complete.
915 * Returns a negative error code for failure, otherwise 1 or 0 to indicate
916 * that the device will or will not have to be unlocked. (0 can be
917 * returned when an interface is given and is BINDING, because in that
918 * case the driver already owns the device lock.)
920 int usb_lock_device_for_reset(struct usb_device
*udev
,
921 struct usb_interface
*iface
)
923 if (udev
->state
== USB_STATE_NOTATTACHED
)
925 if (udev
->state
== USB_STATE_SUSPENDED
)
926 return -EHOSTUNREACH
;
928 switch (iface
->condition
) {
929 case USB_INTERFACE_BINDING
:
931 case USB_INTERFACE_BOUND
:
938 while (!usb_trylock_device(udev
)) {
940 if (udev
->state
== USB_STATE_NOTATTACHED
)
942 if (udev
->state
== USB_STATE_SUSPENDED
)
943 return -EHOSTUNREACH
;
944 if (iface
&& iface
->condition
!= USB_INTERFACE_BOUND
)
951 * usb_unlock_device - release the lock for a usb device structure
952 * @udev: device that's being unlocked
954 * Use this routine when releasing the only device lock you hold;
955 * to release inner nested locks call up(&udev->serialize) directly.
956 * This is necessary for proper interaction with usb_lock_all_devices().
958 void usb_unlock_device(struct usb_device
*udev
)
960 up(&udev
->serialize
);
961 up_read(&usb_all_devices_rwsem
);
965 * usb_lock_all_devices - acquire the lock for all usb device structures
967 * This is necessary when registering a new driver or probing a bus,
968 * since the driver-model core may try to use any usb_device.
970 void usb_lock_all_devices(void)
972 down_write(&usb_all_devices_rwsem
);
976 * usb_unlock_all_devices - release the lock for all usb device structures
978 void usb_unlock_all_devices(void)
980 up_write(&usb_all_devices_rwsem
);
984 static struct usb_device
*match_device(struct usb_device
*dev
,
985 u16 vendor_id
, u16 product_id
)
987 struct usb_device
*ret_dev
= NULL
;
990 dev_dbg(&dev
->dev
, "check for vendor %04x, product %04x ...\n",
991 le16_to_cpu(dev
->descriptor
.idVendor
),
992 le16_to_cpu(dev
->descriptor
.idProduct
));
994 /* see if this device matches */
995 if ((vendor_id
== le16_to_cpu(dev
->descriptor
.idVendor
)) &&
996 (product_id
== le16_to_cpu(dev
->descriptor
.idProduct
))) {
997 dev_dbg (&dev
->dev
, "matched this device!\n");
998 ret_dev
= usb_get_dev(dev
);
1002 /* look through all of the children of this device */
1003 for (child
= 0; child
< dev
->maxchild
; ++child
) {
1004 if (dev
->children
[child
]) {
1005 down(&dev
->children
[child
]->serialize
);
1006 ret_dev
= match_device(dev
->children
[child
],
1007 vendor_id
, product_id
);
1008 up(&dev
->children
[child
]->serialize
);
1018 * usb_find_device - find a specific usb device in the system
1019 * @vendor_id: the vendor id of the device to find
1020 * @product_id: the product id of the device to find
1022 * Returns a pointer to a struct usb_device if such a specified usb
1023 * device is present in the system currently. The usage count of the
1024 * device will be incremented if a device is found. Make sure to call
1025 * usb_put_dev() when the caller is finished with the device.
1027 * If a device with the specified vendor and product id is not found,
1030 struct usb_device
*usb_find_device(u16 vendor_id
, u16 product_id
)
1032 struct list_head
*buslist
;
1033 struct usb_bus
*bus
;
1034 struct usb_device
*dev
= NULL
;
1036 down(&usb_bus_list_lock
);
1037 for (buslist
= usb_bus_list
.next
;
1038 buslist
!= &usb_bus_list
;
1039 buslist
= buslist
->next
) {
1040 bus
= container_of(buslist
, struct usb_bus
, bus_list
);
1043 usb_lock_device(bus
->root_hub
);
1044 dev
= match_device(bus
->root_hub
, vendor_id
, product_id
);
1045 usb_unlock_device(bus
->root_hub
);
1050 up(&usb_bus_list_lock
);
1055 * usb_get_current_frame_number - return current bus frame number
1056 * @dev: the device whose bus is being queried
1058 * Returns the current frame number for the USB host controller
1059 * used with the given USB device. This can be used when scheduling
1060 * isochronous requests.
1062 * Note that different kinds of host controller have different
1063 * "scheduling horizons". While one type might support scheduling only
1064 * 32 frames into the future, others could support scheduling up to
1065 * 1024 frames into the future.
1067 int usb_get_current_frame_number(struct usb_device
*dev
)
1069 return dev
->bus
->op
->get_frame_number (dev
);
1072 /*-------------------------------------------------------------------*/
1074 * __usb_get_extra_descriptor() finds a descriptor of specific type in the
1075 * extra field of the interface and endpoint descriptor structs.
1078 int __usb_get_extra_descriptor(char *buffer
, unsigned size
,
1079 unsigned char type
, void **ptr
)
1081 struct usb_descriptor_header
*header
;
1083 while (size
>= sizeof(struct usb_descriptor_header
)) {
1084 header
= (struct usb_descriptor_header
*)buffer
;
1086 if (header
->bLength
< 2) {
1088 "%s: bogus descriptor, type %d length %d\n",
1090 header
->bDescriptorType
,
1095 if (header
->bDescriptorType
== type
) {
1100 buffer
+= header
->bLength
;
1101 size
-= header
->bLength
;
1107 * usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
1108 * @dev: device the buffer will be used with
1109 * @size: requested buffer size
1110 * @mem_flags: affect whether allocation may block
1111 * @dma: used to return DMA address of buffer
1113 * Return value is either null (indicating no buffer could be allocated), or
1114 * the cpu-space pointer to a buffer that may be used to perform DMA to the
1115 * specified device. Such cpu-space buffers are returned along with the DMA
1116 * address (through the pointer provided).
1118 * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags
1119 * to avoid behaviors like using "DMA bounce buffers", or tying down I/O
1120 * mapping hardware for long idle periods. The implementation varies between
1121 * platforms, depending on details of how DMA will work to this device.
1122 * Using these buffers also helps prevent cacheline sharing problems on
1123 * architectures where CPU caches are not DMA-coherent.
1125 * When the buffer is no longer used, free it with usb_buffer_free().
1127 void *usb_buffer_alloc (
1128 struct usb_device
*dev
,
1134 if (!dev
|| !dev
->bus
|| !dev
->bus
->op
|| !dev
->bus
->op
->buffer_alloc
)
1136 return dev
->bus
->op
->buffer_alloc (dev
->bus
, size
, mem_flags
, dma
);
1140 * usb_buffer_free - free memory allocated with usb_buffer_alloc()
1141 * @dev: device the buffer was used with
1142 * @size: requested buffer size
1143 * @addr: CPU address of buffer
1144 * @dma: DMA address of buffer
1146 * This reclaims an I/O buffer, letting it be reused. The memory must have
1147 * been allocated using usb_buffer_alloc(), and the parameters must match
1148 * those provided in that allocation request.
1150 void usb_buffer_free (
1151 struct usb_device
*dev
,
1157 if (!dev
|| !dev
->bus
|| !dev
->bus
->op
|| !dev
->bus
->op
->buffer_free
)
1159 dev
->bus
->op
->buffer_free (dev
->bus
, size
, addr
, dma
);
1163 * usb_buffer_map - create DMA mapping(s) for an urb
1164 * @urb: urb whose transfer_buffer/setup_packet will be mapped
1166 * Return value is either null (indicating no buffer could be mapped), or
1167 * the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are
1168 * added to urb->transfer_flags if the operation succeeds. If the device
1169 * is connected to this system through a non-DMA controller, this operation
1172 * This call would normally be used for an urb which is reused, perhaps
1173 * as the target of a large periodic transfer, with usb_buffer_dmasync()
1174 * calls to synchronize memory and dma state.
1176 * Reverse the effect of this call with usb_buffer_unmap().
1179 struct urb
*usb_buffer_map (struct urb
*urb
)
1181 struct usb_bus
*bus
;
1182 struct device
*controller
;
1186 || !(bus
= urb
->dev
->bus
)
1187 || !(controller
= bus
->controller
))
1190 if (controller
->dma_mask
) {
1191 urb
->transfer_dma
= dma_map_single (controller
,
1192 urb
->transfer_buffer
, urb
->transfer_buffer_length
,
1193 usb_pipein (urb
->pipe
)
1194 ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1195 if (usb_pipecontrol (urb
->pipe
))
1196 urb
->setup_dma
= dma_map_single (controller
,
1198 sizeof (struct usb_ctrlrequest
),
1200 // FIXME generic api broken like pci, can't report errors
1201 // if (urb->transfer_dma == DMA_ADDR_INVALID) return 0;
1203 urb
->transfer_dma
= ~0;
1204 urb
->transfer_flags
|= (URB_NO_TRANSFER_DMA_MAP
1205 | URB_NO_SETUP_DMA_MAP
);
1210 /* XXX DISABLED, no users currently. If you wish to re-enable this
1211 * XXX please determine whether the sync is to transfer ownership of
1212 * XXX the buffer from device to cpu or vice verse, and thusly use the
1213 * XXX appropriate _for_{cpu,device}() method. -DaveM
1218 * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s)
1219 * @urb: urb whose transfer_buffer/setup_packet will be synchronized
1221 void usb_buffer_dmasync (struct urb
*urb
)
1223 struct usb_bus
*bus
;
1224 struct device
*controller
;
1227 || !(urb
->transfer_flags
& URB_NO_TRANSFER_DMA_MAP
)
1229 || !(bus
= urb
->dev
->bus
)
1230 || !(controller
= bus
->controller
))
1233 if (controller
->dma_mask
) {
1234 dma_sync_single (controller
,
1235 urb
->transfer_dma
, urb
->transfer_buffer_length
,
1236 usb_pipein (urb
->pipe
)
1237 ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1238 if (usb_pipecontrol (urb
->pipe
))
1239 dma_sync_single (controller
,
1241 sizeof (struct usb_ctrlrequest
),
1248 * usb_buffer_unmap - free DMA mapping(s) for an urb
1249 * @urb: urb whose transfer_buffer will be unmapped
1251 * Reverses the effect of usb_buffer_map().
1254 void usb_buffer_unmap (struct urb
*urb
)
1256 struct usb_bus
*bus
;
1257 struct device
*controller
;
1260 || !(urb
->transfer_flags
& URB_NO_TRANSFER_DMA_MAP
)
1262 || !(bus
= urb
->dev
->bus
)
1263 || !(controller
= bus
->controller
))
1266 if (controller
->dma_mask
) {
1267 dma_unmap_single (controller
,
1268 urb
->transfer_dma
, urb
->transfer_buffer_length
,
1269 usb_pipein (urb
->pipe
)
1270 ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1271 if (usb_pipecontrol (urb
->pipe
))
1272 dma_unmap_single (controller
,
1274 sizeof (struct usb_ctrlrequest
),
1277 urb
->transfer_flags
&= ~(URB_NO_TRANSFER_DMA_MAP
1278 | URB_NO_SETUP_DMA_MAP
);
1283 * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint
1284 * @dev: device to which the scatterlist will be mapped
1285 * @pipe: endpoint defining the mapping direction
1286 * @sg: the scatterlist to map
1287 * @nents: the number of entries in the scatterlist
1289 * Return value is either < 0 (indicating no buffers could be mapped), or
1290 * the number of DMA mapping array entries in the scatterlist.
1292 * The caller is responsible for placing the resulting DMA addresses from
1293 * the scatterlist into URB transfer buffer pointers, and for setting the
1294 * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs.
1296 * Top I/O rates come from queuing URBs, instead of waiting for each one
1297 * to complete before starting the next I/O. This is particularly easy
1298 * to do with scatterlists. Just allocate and submit one URB for each DMA
1299 * mapping entry returned, stopping on the first error or when all succeed.
1300 * Better yet, use the usb_sg_*() calls, which do that (and more) for you.
1302 * This call would normally be used when translating scatterlist requests,
1303 * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it
1304 * may be able to coalesce mappings for improved I/O efficiency.
1306 * Reverse the effect of this call with usb_buffer_unmap_sg().
1308 int usb_buffer_map_sg (struct usb_device
*dev
, unsigned pipe
,
1309 struct scatterlist
*sg
, int nents
)
1311 struct usb_bus
*bus
;
1312 struct device
*controller
;
1315 || usb_pipecontrol (pipe
)
1316 || !(bus
= dev
->bus
)
1317 || !(controller
= bus
->controller
)
1318 || !controller
->dma_mask
)
1321 // FIXME generic api broken like pci, can't report errors
1322 return dma_map_sg (controller
, sg
, nents
,
1323 usb_pipein (pipe
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1326 /* XXX DISABLED, no users currently. If you wish to re-enable this
1327 * XXX please determine whether the sync is to transfer ownership of
1328 * XXX the buffer from device to cpu or vice verse, and thusly use the
1329 * XXX appropriate _for_{cpu,device}() method. -DaveM
1334 * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s)
1335 * @dev: device to which the scatterlist will be mapped
1336 * @pipe: endpoint defining the mapping direction
1337 * @sg: the scatterlist to synchronize
1338 * @n_hw_ents: the positive return value from usb_buffer_map_sg
1340 * Use this when you are re-using a scatterlist's data buffers for
1341 * another USB request.
1343 void usb_buffer_dmasync_sg (struct usb_device
*dev
, unsigned pipe
,
1344 struct scatterlist
*sg
, int n_hw_ents
)
1346 struct usb_bus
*bus
;
1347 struct device
*controller
;
1350 || !(bus
= dev
->bus
)
1351 || !(controller
= bus
->controller
)
1352 || !controller
->dma_mask
)
1355 dma_sync_sg (controller
, sg
, n_hw_ents
,
1356 usb_pipein (pipe
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1361 * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist
1362 * @dev: device to which the scatterlist will be mapped
1363 * @pipe: endpoint defining the mapping direction
1364 * @sg: the scatterlist to unmap
1365 * @n_hw_ents: the positive return value from usb_buffer_map_sg
1367 * Reverses the effect of usb_buffer_map_sg().
1369 void usb_buffer_unmap_sg (struct usb_device
*dev
, unsigned pipe
,
1370 struct scatterlist
*sg
, int n_hw_ents
)
1372 struct usb_bus
*bus
;
1373 struct device
*controller
;
1376 || !(bus
= dev
->bus
)
1377 || !(controller
= bus
->controller
)
1378 || !controller
->dma_mask
)
1381 dma_unmap_sg (controller
, sg
, n_hw_ents
,
1382 usb_pipein (pipe
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1385 static int usb_generic_suspend(struct device
*dev
, u32 state
)
1387 struct usb_interface
*intf
;
1388 struct usb_driver
*driver
;
1390 if (dev
->driver
== &usb_generic_driver
)
1391 return usb_suspend_device (to_usb_device(dev
), state
);
1393 if ((dev
->driver
== NULL
) ||
1394 (dev
->driver_data
== &usb_generic_driver_data
))
1397 intf
= to_usb_interface(dev
);
1398 driver
= to_usb_driver(dev
->driver
);
1400 /* there's only one USB suspend state */
1401 if (intf
->dev
.power
.power_state
)
1404 if (driver
->suspend
)
1405 return driver
->suspend(intf
, state
);
1409 static int usb_generic_resume(struct device
*dev
)
1411 struct usb_interface
*intf
;
1412 struct usb_driver
*driver
;
1414 /* devices resume through their hub */
1415 if (dev
->driver
== &usb_generic_driver
)
1416 return usb_resume_device (to_usb_device(dev
));
1418 if ((dev
->driver
== NULL
) ||
1419 (dev
->driver_data
== &usb_generic_driver_data
))
1422 intf
= to_usb_interface(dev
);
1423 driver
= to_usb_driver(dev
->driver
);
1426 return driver
->resume(intf
);
1430 struct bus_type usb_bus_type
= {
1432 .match
= usb_device_match
,
1433 .hotplug
= usb_hotplug
,
1434 .suspend
= usb_generic_suspend
,
1435 .resume
= usb_generic_resume
,
1440 static int __init
usb_setup_disable(char *str
)
1446 /* format to disable USB on kernel command line is: nousb */
1447 __setup("nousb", usb_setup_disable
);
1452 * for external read access to <nousb>
1454 int usb_disabled(void)
1462 static int __init
usb_init(void)
1466 pr_info ("%s: USB support disabled\n", usbcore_name
);
1470 retval
= bus_register(&usb_bus_type
);
1473 retval
= usb_host_init();
1475 goto host_init_failed
;
1476 retval
= usb_major_init();
1478 goto major_init_failed
;
1479 retval
= usbfs_init();
1481 goto fs_init_failed
;
1482 retval
= usb_hub_init();
1484 goto hub_init_failed
;
1486 retval
= driver_register(&usb_generic_driver
);
1494 usb_major_cleanup();
1498 bus_unregister(&usb_bus_type
);
1506 static void __exit
usb_exit(void)
1508 /* This will matter if shutdown/reboot does exitcalls. */
1512 driver_unregister(&usb_generic_driver
);
1513 usb_major_cleanup();
1517 bus_unregister(&usb_bus_type
);
1520 subsys_initcall(usb_init
);
1521 module_exit(usb_exit
);
1524 * USB may be built into the kernel or be built as modules.
1525 * These symbols are exported for device (or host controller)
1526 * driver modules to use.
1529 EXPORT_SYMBOL(usb_register
);
1530 EXPORT_SYMBOL(usb_deregister
);
1531 EXPORT_SYMBOL(usb_disabled
);
1533 EXPORT_SYMBOL(usb_alloc_dev
);
1534 EXPORT_SYMBOL(usb_put_dev
);
1535 EXPORT_SYMBOL(usb_get_dev
);
1536 EXPORT_SYMBOL(usb_hub_tt_clear_buffer
);
1538 EXPORT_SYMBOL(usb_lock_device
);
1539 EXPORT_SYMBOL(usb_trylock_device
);
1540 EXPORT_SYMBOL(usb_lock_device_for_reset
);
1541 EXPORT_SYMBOL(usb_unlock_device
);
1543 EXPORT_SYMBOL(usb_driver_claim_interface
);
1544 EXPORT_SYMBOL(usb_driver_release_interface
);
1545 EXPORT_SYMBOL(usb_match_id
);
1546 EXPORT_SYMBOL(usb_find_interface
);
1547 EXPORT_SYMBOL(usb_ifnum_to_if
);
1548 EXPORT_SYMBOL(usb_altnum_to_altsetting
);
1550 EXPORT_SYMBOL(usb_reset_device
);
1551 EXPORT_SYMBOL(usb_disconnect
);
1553 EXPORT_SYMBOL(__usb_get_extra_descriptor
);
1555 EXPORT_SYMBOL(usb_find_device
);
1556 EXPORT_SYMBOL(usb_get_current_frame_number
);
1558 EXPORT_SYMBOL (usb_buffer_alloc
);
1559 EXPORT_SYMBOL (usb_buffer_free
);
1562 EXPORT_SYMBOL (usb_buffer_map
);
1563 EXPORT_SYMBOL (usb_buffer_dmasync
);
1564 EXPORT_SYMBOL (usb_buffer_unmap
);
1567 EXPORT_SYMBOL (usb_buffer_map_sg
);
1569 EXPORT_SYMBOL (usb_buffer_dmasync_sg
);
1571 EXPORT_SYMBOL (usb_buffer_unmap_sg
);
1573 MODULE_LICENSE("GPL");