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 2000-2001 (kernel hotplug, usb_device_id,
12 * (C) Copyright Yggdrasil Computing, Inc. 2000
13 * (usb_device_id matching changes by Adam J. Richter)
14 * (C) Copyright Greg Kroah-Hartman 2002-2003
16 * NOTE! This is not actually a driver at all, rather this is
17 * just a collection of helper routines that implement the
18 * generic USB things that the real drivers can use..
20 * Think of this as a "USB library" rather than anything else.
21 * It should be considered a slave, with no callbacks. Callbacks
25 #include <linux/config.h>
27 #ifdef CONFIG_USB_DEBUG
33 #include <linux/module.h>
34 #include <linux/string.h>
35 #include <linux/bitops.h>
36 #include <linux/slab.h>
37 #include <linux/interrupt.h> /* for in_interrupt() */
38 #include <linux/kmod.h>
39 #include <linux/init.h>
40 #include <linux/spinlock.h>
41 #include <linux/errno.h>
42 #include <linux/smp_lock.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 int nousb
; /* Disable USB when built into kernel image */
62 /* Not honored on modular build */
65 static int generic_probe (struct device
*dev
)
69 static int generic_remove (struct device
*dev
)
74 static struct device_driver usb_generic_driver
= {
77 .probe
= generic_probe
,
78 .remove
= generic_remove
,
81 static int usb_generic_driver_data
;
83 /* needs to be called with BKL held */
84 int usb_device_probe(struct device
*dev
)
86 struct usb_interface
* intf
= to_usb_interface(dev
);
87 struct usb_driver
* driver
= to_usb_driver(dev
->driver
);
88 const struct usb_device_id
*id
;
91 dev_dbg(dev
, "%s\n", __FUNCTION__
);
96 id
= usb_match_id (intf
, driver
->id_table
);
98 dev_dbg (dev
, "%s - got id\n", __FUNCTION__
);
99 down (&driver
->serialize
);
100 error
= driver
->probe (intf
, id
);
101 up (&driver
->serialize
);
104 intf
->driver
= driver
;
109 int usb_device_remove(struct device
*dev
)
111 struct usb_interface
*intf
;
112 struct usb_driver
*driver
;
114 intf
= list_entry(dev
,struct usb_interface
,dev
);
115 driver
= to_usb_driver(dev
->driver
);
117 down(&driver
->serialize
);
119 if (intf
->driver
&& intf
->driver
->disconnect
)
120 intf
->driver
->disconnect(intf
);
122 /* if driver->disconnect didn't release the interface */
124 usb_driver_release_interface(driver
, intf
);
126 up(&driver
->serialize
);
132 * usb_register - register a USB driver
133 * @new_driver: USB operations for the driver
135 * Registers a USB driver with the USB core. The list of unattached
136 * interfaces will be rescanned whenever a new driver is added, allowing
137 * the new driver to attach to any recognized devices.
138 * Returns a negative error code on failure and 0 on success.
140 * NOTE: if you want your driver to use the USB major number, you must call
141 * usb_register_dev() to enable that functionality. This function no longer
142 * takes care of that.
144 int usb_register(struct usb_driver
*new_driver
)
151 new_driver
->driver
.name
= (char *)new_driver
->name
;
152 new_driver
->driver
.bus
= &usb_bus_type
;
153 new_driver
->driver
.probe
= usb_device_probe
;
154 new_driver
->driver
.remove
= usb_device_remove
;
156 init_MUTEX(&new_driver
->serialize
);
158 retval
= driver_register(&new_driver
->driver
);
161 info("registered new driver %s", new_driver
->name
);
162 usbfs_update_special();
164 err("problem %d when registering driver %s",
165 retval
, new_driver
->name
);
172 * usb_deregister - unregister a USB driver
173 * @driver: USB operations of the driver to unregister
174 * Context: !in_interrupt (), must be called with BKL held
176 * Unlinks the specified driver from the internal USB driver list.
178 * NOTE: If you called usb_register_dev(), you still need to call
179 * usb_deregister_dev() to clean up your driver's allocated minor numbers,
180 * this * call will no longer do it for you.
182 void usb_deregister(struct usb_driver
*driver
)
184 info("deregistering driver %s", driver
->name
);
186 driver_unregister (&driver
->driver
);
188 usbfs_update_special();
192 * usb_ifnum_to_if - get the interface object with a given interface number (usbcore-internal)
193 * @dev: the device whose current configuration is considered
194 * @ifnum: the desired interface
196 * This walks the device descriptor for the currently active configuration
197 * and returns a pointer to the interface with that particular interface
200 * Note that configuration descriptors are not required to assign interface
201 * numbers sequentially, so that it would be incorrect to assume that
202 * the first interface in that descriptor corresponds to interface zero.
203 * This routine helps device drivers avoid such mistakes.
204 * However, you should make sure that you do the right thing with any
205 * alternate settings available for this interfaces.
207 struct usb_interface
*usb_ifnum_to_if(struct usb_device
*dev
, unsigned ifnum
)
211 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++)
212 if (dev
->actconfig
->interface
[i
].altsetting
[0]
213 .desc
.bInterfaceNumber
== ifnum
)
214 return &dev
->actconfig
->interface
[i
];
220 * usb_epnum_to_ep_desc - get the endpoint object with a given endpoint number
221 * @dev: the device whose current configuration is considered
222 * @epnum: the desired endpoint
224 * This walks the device descriptor for the currently active configuration,
225 * and returns a pointer to the endpoint with that particular endpoint
228 * Note that interface descriptors are not required to assign endpont
229 * numbers sequentially, so that it would be incorrect to assume that
230 * the first endpoint in that descriptor corresponds to interface zero.
231 * This routine helps device drivers avoid such mistakes.
233 struct usb_endpoint_descriptor
*
234 usb_epnum_to_ep_desc(struct usb_device
*dev
, unsigned epnum
)
238 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++)
239 for (j
= 0; j
< dev
->actconfig
->interface
[i
].num_altsetting
; j
++)
240 for (k
= 0; k
< dev
->actconfig
->interface
[i
]
241 .altsetting
[j
].desc
.bNumEndpoints
; k
++)
242 if (epnum
== dev
->actconfig
->interface
[i
]
243 .altsetting
[j
].endpoint
[k
]
244 .desc
.bEndpointAddress
)
245 return &dev
->actconfig
->interface
[i
]
246 .altsetting
[j
].endpoint
[k
]
253 * usb_driver_claim_interface - bind a driver to an interface
254 * @driver: the driver to be bound
255 * @iface: the interface to which it will be bound
256 * @priv: driver data associated with that interface
258 * This is used by usb device drivers that need to claim more than one
259 * interface on a device when probing (audio and acm are current examples).
260 * No device driver should directly modify internal usb_interface or
261 * usb_device structure members.
263 * Few drivers should need to use this routine, since the most natural
264 * way to bind to an interface is to return the private data from
265 * the driver's probe() method. Any driver that does use this must
266 * first be sure that no other driver has claimed the interface, by
267 * checking with usb_interface_claimed().
269 void usb_driver_claim_interface(struct usb_driver
*driver
, struct usb_interface
*iface
, void* priv
)
271 if (!iface
|| !driver
)
274 // FIXME change API to report an error in this case
276 err ("%s driver booted %s off interface %p",
277 driver
->name
, iface
->driver
->name
, iface
);
279 dbg("%s driver claimed interface %p", driver
->name
, iface
);
281 iface
->driver
= driver
;
282 usb_set_intfdata(iface
, priv
);
286 * usb_interface_claimed - returns true iff an interface is claimed
287 * @iface: the interface being checked
289 * This should be used by drivers to check other interfaces to see if
290 * they are available or not. If another driver has claimed the interface,
291 * they may not claim it. Otherwise it's OK to claim it using
292 * usb_driver_claim_interface().
294 * Returns true (nonzero) iff the interface is claimed, else false (zero).
296 int usb_interface_claimed(struct usb_interface
*iface
)
301 return (iface
->driver
!= NULL
);
302 } /* usb_interface_claimed() */
305 * usb_driver_release_interface - unbind a driver from an interface
306 * @driver: the driver to be unbound
307 * @iface: the interface from which it will be unbound
309 * This should be used by drivers to release their claimed interfaces.
310 * It is normally called in their disconnect() methods, and only for
311 * drivers that bound to more than one interface in their probe().
313 * When the USB subsystem disconnect()s a driver from some interface,
314 * it automatically invokes this method for that interface. That
315 * means that even drivers that used usb_driver_claim_interface()
316 * usually won't need to call this.
318 void usb_driver_release_interface(struct usb_driver
*driver
, struct usb_interface
*iface
)
320 /* this should never happen, don't release something that's not ours */
321 if (!iface
|| iface
->driver
!= driver
)
324 iface
->driver
= NULL
;
325 usb_set_intfdata(iface
, NULL
);
329 * usb_match_id - find first usb_device_id matching device or interface
330 * @interface: the interface of interest
331 * @id: array of usb_device_id structures, terminated by zero entry
333 * usb_match_id searches an array of usb_device_id's and returns
334 * the first one matching the device or interface, or null.
335 * This is used when binding (or rebinding) a driver to an interface.
336 * Most USB device drivers will use this indirectly, through the usb core,
337 * but some layered driver frameworks use it directly.
338 * These device tables are exported with MODULE_DEVICE_TABLE, through
339 * modutils and "modules.usbmap", to support the driver loading
340 * functionality of USB hotplugging.
344 * The "match_flags" element in a usb_device_id controls which
345 * members are used. If the corresponding bit is set, the
346 * value in the device_id must match its corresponding member
347 * in the device or interface descriptor, or else the device_id
350 * "driver_info" is normally used only by device drivers,
351 * but you can create a wildcard "matches anything" usb_device_id
352 * as a driver's "modules.usbmap" entry if you provide an id with
353 * only a nonzero "driver_info" field. If you do this, the USB device
354 * driver's probe() routine should use additional intelligence to
355 * decide whether to bind to the specified interface.
357 * What Makes Good usb_device_id Tables:
359 * The match algorithm is very simple, so that intelligence in
360 * driver selection must come from smart driver id records.
361 * Unless you have good reasons to use another selection policy,
362 * provide match elements only in related groups, and order match
363 * specifiers from specific to general. Use the macros provided
364 * for that purpose if you can.
366 * The most specific match specifiers use device descriptor
367 * data. These are commonly used with product-specific matches;
368 * the USB_DEVICE macro lets you provide vendor and product IDs,
369 * and you can also match against ranges of product revisions.
370 * These are widely used for devices with application or vendor
371 * specific bDeviceClass values.
373 * Matches based on device class/subclass/protocol specifications
374 * are slightly more general; use the USB_DEVICE_INFO macro, or
375 * its siblings. These are used with single-function devices
376 * where bDeviceClass doesn't specify that each interface has
379 * Matches based on interface class/subclass/protocol are the
380 * most general; they let drivers bind to any interface on a
381 * multiple-function device. Use the USB_INTERFACE_INFO
382 * macro, or its siblings, to match class-per-interface style
383 * devices (as recorded in bDeviceClass).
385 * Within those groups, remember that not all combinations are
386 * meaningful. For example, don't give a product version range
387 * without vendor and product IDs; or specify a protocol without
388 * its associated class and subclass.
390 const struct usb_device_id
*
391 usb_match_id(struct usb_interface
*interface
, const struct usb_device_id
*id
)
393 struct usb_host_interface
*intf
;
394 struct usb_device
*dev
;
396 /* proc_connectinfo in devio.c may call us with id == NULL. */
400 intf
= &interface
->altsetting
[interface
->act_altsetting
];
401 dev
= interface_to_usbdev(interface
);
403 /* It is important to check that id->driver_info is nonzero,
404 since an entry that is all zeroes except for a nonzero
405 id->driver_info is the way to create an entry that
406 indicates that the driver want to examine every
407 device and interface. */
408 for (; id
->idVendor
|| id
->bDeviceClass
|| id
->bInterfaceClass
||
409 id
->driver_info
; id
++) {
411 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_VENDOR
) &&
412 id
->idVendor
!= dev
->descriptor
.idVendor
)
415 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_PRODUCT
) &&
416 id
->idProduct
!= dev
->descriptor
.idProduct
)
419 /* No need to test id->bcdDevice_lo != 0, since 0 is never
420 greater than any unsigned number. */
421 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_LO
) &&
422 (id
->bcdDevice_lo
> dev
->descriptor
.bcdDevice
))
425 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_HI
) &&
426 (id
->bcdDevice_hi
< dev
->descriptor
.bcdDevice
))
429 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_CLASS
) &&
430 (id
->bDeviceClass
!= dev
->descriptor
.bDeviceClass
))
433 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_SUBCLASS
) &&
434 (id
->bDeviceSubClass
!= dev
->descriptor
.bDeviceSubClass
))
437 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_PROTOCOL
) &&
438 (id
->bDeviceProtocol
!= dev
->descriptor
.bDeviceProtocol
))
441 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_CLASS
) &&
442 (id
->bInterfaceClass
!= intf
->desc
.bInterfaceClass
))
445 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_SUBCLASS
) &&
446 (id
->bInterfaceSubClass
!= intf
->desc
.bInterfaceSubClass
))
449 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_PROTOCOL
) &&
450 (id
->bInterfaceProtocol
!= intf
->desc
.bInterfaceProtocol
))
460 * usb_find_interface - find usb_interface pointer for driver and device
461 * @drv: the driver whose current configuration is considered
462 * @minor: the minor number of the desired device
464 * This walks the driver device list and returns a pointer to the interface
465 * with the matching minor. Note, this only works for devices that share the
468 struct usb_interface
*usb_find_interface(struct usb_driver
*drv
, int minor
)
470 struct list_head
*entry
;
472 struct usb_interface
*intf
;
474 list_for_each(entry
, &drv
->driver
.devices
) {
475 dev
= container_of(entry
, struct device
, driver_list
);
477 /* can't look at usb devices, only interfaces */
478 if (dev
->driver
== &usb_generic_driver
)
481 intf
= to_usb_interface(dev
);
482 if (intf
->minor
== -1)
484 if (intf
->minor
== minor
)
488 /* no device found that matches */
492 static int usb_device_match (struct device
*dev
, struct device_driver
*drv
)
494 struct usb_interface
*intf
;
495 struct usb_driver
*usb_drv
;
496 const struct usb_device_id
*id
;
498 /* check for generic driver, which we don't match any device with */
499 if (drv
== &usb_generic_driver
)
502 intf
= to_usb_interface(dev
);
504 usb_drv
= to_usb_driver(drv
);
505 id
= usb_drv
->id_table
;
507 id
= usb_match_id (intf
, usb_drv
->id_table
);
515 #ifdef CONFIG_HOTPLUG
518 * USB hotplugging invokes what /proc/sys/kernel/hotplug says
519 * (normally /sbin/hotplug) when USB devices get added or removed.
521 * This invokes a user mode policy agent, typically helping to load driver
522 * or other modules, configure the device, and more. Drivers can provide
523 * a MODULE_DEVICE_TABLE to help with module loading subtasks.
525 * We're called either from khubd (the typical case) or from root hub
526 * (init, kapmd, modprobe, rmmod, etc), but the agents need to handle
527 * delays in event delivery. Use sysfs (and DEVPATH) to make sure the
528 * device (and this configuration!) are still present.
530 static int usb_hotplug (struct device
*dev
, char **envp
, int num_envp
,
531 char *buffer
, int buffer_size
)
533 struct usb_interface
*intf
;
534 struct usb_device
*usb_dev
;
539 dbg ("%s", __FUNCTION__
);
544 /* Must check driver_data here, as on remove driver is always NULL */
545 if ((dev
->driver
== &usb_generic_driver
) ||
546 (dev
->driver_data
== &usb_generic_driver_data
))
549 intf
= to_usb_interface(dev
);
550 usb_dev
= interface_to_usbdev (intf
);
552 if (usb_dev
->devnum
< 0) {
553 dbg ("device already deleted ??");
557 dbg ("bus already removed?");
563 #ifdef CONFIG_USB_DEVICEFS
564 /* If this is available, userspace programs can directly read
565 * all the device descriptors we don't tell them about. Or
566 * even act as usermode drivers.
568 * FIXME reduce hardwired intelligence here
570 envp
[i
++] = scratch
;
571 length
+= snprintf (scratch
, buffer_size
- length
,
572 "DEVICE=/proc/bus/usb/%03d/%03d",
573 usb_dev
->bus
->busnum
, usb_dev
->devnum
);
574 if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
580 /* per-device configurations are common */
581 envp
[i
++] = scratch
;
582 length
+= snprintf (scratch
, buffer_size
- length
, "PRODUCT=%x/%x/%x",
583 usb_dev
->descriptor
.idVendor
,
584 usb_dev
->descriptor
.idProduct
,
585 usb_dev
->descriptor
.bcdDevice
);
586 if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
591 /* class-based driver binding models */
592 envp
[i
++] = scratch
;
593 length
+= snprintf (scratch
, buffer_size
- length
, "TYPE=%d/%d/%d",
594 usb_dev
->descriptor
.bDeviceClass
,
595 usb_dev
->descriptor
.bDeviceSubClass
,
596 usb_dev
->descriptor
.bDeviceProtocol
);
597 if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
602 if (usb_dev
->descriptor
.bDeviceClass
== 0) {
603 int alt
= intf
->act_altsetting
;
605 /* 2.4 only exposed interface zero. in 2.5, hotplug
606 * agents are called for all interfaces, and can use
607 * $DEVPATH/bInterfaceNumber if necessary.
609 envp
[i
++] = scratch
;
610 length
+= snprintf (scratch
, buffer_size
- length
,
611 "INTERFACE=%d/%d/%d",
612 intf
->altsetting
[alt
].desc
.bInterfaceClass
,
613 intf
->altsetting
[alt
].desc
.bInterfaceSubClass
,
614 intf
->altsetting
[alt
].desc
.bInterfaceProtocol
);
615 if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
628 static int usb_hotplug (struct device
*dev
, char **envp
,
629 int num_envp
, char *buffer
, int buffer_size
)
634 #endif /* CONFIG_HOTPLUG */
637 * usb_alloc_dev - allocate a usb device structure (usbcore-internal)
638 * @parent: hub to which device is connected
639 * @bus: bus used to access the device
640 * Context: !in_interrupt ()
642 * Only hub drivers (including virtual root hub drivers for host
643 * controllers) should ever call this.
645 * This call is synchronous, and may not be used in an interrupt context.
647 struct usb_device
*usb_alloc_dev(struct usb_device
*parent
, struct usb_bus
*bus
)
649 struct usb_device
*dev
;
651 dev
= kmalloc(sizeof(*dev
), GFP_KERNEL
);
655 memset(dev
, 0, sizeof(*dev
));
657 bus
= usb_bus_get(bus
);
663 device_initialize(&dev
->dev
);
664 dev
->state
= USB_STATE_ATTACHED
;
667 dev
->devpath
[0] = '0';
669 dev
->parent
= parent
;
670 INIT_LIST_HEAD(&dev
->filelist
);
672 init_MUTEX(&dev
->serialize
);
674 if (dev
->bus
->op
->allocate
)
675 dev
->bus
->op
->allocate(dev
);
681 * usb_get_dev - increments the reference count of the usb device structure
682 * @dev: the device being referenced
684 * Each live reference to a device should be refcounted.
686 * Drivers for USB interfaces should normally record such references in
687 * their probe() methods, when they bind to an interface, and release
688 * them by calling usb_put_dev(), in their disconnect() methods.
690 * A pointer to the device with the incremented reference counter is returned.
692 struct usb_device
*usb_get_dev (struct usb_device
*dev
)
699 tmp
= get_device(&dev
->dev
);
701 return to_usb_device(tmp
);
707 * usb_put_dev - release a use of the usb device structure
708 * @dev: device that's been disconnected
710 * Must be called when a user of a device is finished with it. When the last
711 * user of the device calls this function, the memory of the device is freed.
713 void usb_put_dev(struct usb_device
*dev
)
716 put_device(&dev
->dev
);
720 * usb_release_dev - free a usb device structure when all users of it are finished.
721 * @dev: device that's been disconnected
723 * Will be called only by the device core when all users of this usb device are
726 static void usb_release_dev(struct device
*dev
)
728 struct usb_device
*udev
;
730 udev
= to_usb_device(dev
);
732 if (udev
->bus
&& udev
->bus
->op
&& udev
->bus
->op
->deallocate
)
733 udev
->bus
->op
->deallocate(udev
);
734 usb_destroy_configuration (udev
);
735 usb_bus_put (udev
->bus
);
740 static struct usb_device
*match_device(struct usb_device
*dev
,
741 u16 vendor_id
, u16 product_id
)
743 struct usb_device
*ret_dev
= NULL
;
746 dbg("looking at vendor %d, product %d",
747 dev
->descriptor
.idVendor
,
748 dev
->descriptor
.idProduct
);
750 /* see if this device matches */
751 if ((dev
->descriptor
.idVendor
== vendor_id
) &&
752 (dev
->descriptor
.idProduct
== product_id
)) {
753 dbg ("found the device!");
754 ret_dev
= usb_get_dev(dev
);
758 /* look through all of the children of this device */
759 for (child
= 0; child
< dev
->maxchild
; ++child
) {
760 if (dev
->children
[child
]) {
761 ret_dev
= match_device(dev
->children
[child
],
762 vendor_id
, product_id
);
772 * usb_find_device - find a specific usb device in the system
773 * @vendor_id: the vendor id of the device to find
774 * @product_id: the product id of the device to find
776 * Returns a pointer to a struct usb_device if such a specified usb
777 * device is present in the system currently. The usage count of the
778 * device will be incremented if a device is found. Make sure to call
779 * usb_put_dev() when the caller is finished with the device.
781 * If a device with the specified vendor and product id is not found,
784 struct usb_device
*usb_find_device(u16 vendor_id
, u16 product_id
)
786 struct list_head
*buslist
;
788 struct usb_device
*dev
= NULL
;
790 down(&usb_bus_list_lock
);
791 for (buslist
= usb_bus_list
.next
;
792 buslist
!= &usb_bus_list
;
793 buslist
= buslist
->next
) {
794 bus
= container_of(buslist
, struct usb_bus
, bus_list
);
795 dev
= match_device(bus
->root_hub
, vendor_id
, product_id
);
800 up(&usb_bus_list_lock
);
805 * usb_get_current_frame_number - return current bus frame number
806 * @dev: the device whose bus is being queried
808 * Returns the current frame number for the USB host controller
809 * used with the given USB device. This can be used when scheduling
810 * isochronous requests.
812 * Note that different kinds of host controller have different
813 * "scheduling horizons". While one type might support scheduling only
814 * 32 frames into the future, others could support scheduling up to
815 * 1024 frames into the future.
817 int usb_get_current_frame_number(struct usb_device
*dev
)
819 return dev
->bus
->op
->get_frame_number (dev
);
822 /*-------------------------------------------------------------------*/
824 * __usb_get_extra_descriptor() finds a descriptor of specific type in the
825 * extra field of the interface and endpoint descriptor structs.
828 int __usb_get_extra_descriptor(char *buffer
, unsigned size
, unsigned char type
, void **ptr
)
830 struct usb_descriptor_header
*header
;
832 while (size
>= sizeof(struct usb_descriptor_header
)) {
833 header
= (struct usb_descriptor_header
*)buffer
;
835 if (header
->bLength
< 2) {
836 err("invalid descriptor length of %d", header
->bLength
);
840 if (header
->bDescriptorType
== type
) {
845 buffer
+= header
->bLength
;
846 size
-= header
->bLength
;
852 * usb_disconnect - disconnect a device (usbcore-internal)
853 * @pdev: pointer to device being disconnected
854 * Context: !in_interrupt ()
856 * Something got disconnected. Get rid of it, and all of its children.
858 * Only hub drivers (including virtual root hub drivers for host
859 * controllers) should ever call this.
861 * This call is synchronous, and may not be used in an interrupt context.
863 void usb_disconnect(struct usb_device
**pdev
)
865 struct usb_device
*dev
= *pdev
;
867 struct usb_operations
*ops
;
873 pr_debug ("%s nodev\n", __FUNCTION__
);
878 pr_debug ("%s nobus\n", __FUNCTION__
);
885 /* mark the device as inactive, so any further urb submissions for
886 * this device will fail.
888 dev
->state
= USB_STATE_NOTATTACHED
;
890 dev_info (&dev
->dev
, "USB disconnect, address %d\n", dev
->devnum
);
892 /* Free up all the children before we remove this device */
893 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
894 struct usb_device
**child
= dev
->children
+ i
;
896 usb_disconnect(child
);
899 /* disconnect() drivers from interfaces (a key side effect) */
900 dev_dbg (&dev
->dev
, "unregistering interfaces\n");
901 if (dev
->actconfig
) {
902 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++) {
903 struct usb_interface
*interface
;
905 /* remove this interface */
906 interface
= &dev
->actconfig
->interface
[i
];
907 device_unregister(&interface
->dev
);
911 /* deallocate hcd/hardware state */
913 void (*disable
)(struct usb_device
*, int) = ops
->disable
;
915 for (i
= 0; i
< 15; i
++) {
917 disable (dev
, USB_DIR_IN
| i
);
921 dev_dbg (&dev
->dev
, "unregistering device\n");
922 /* Free the device number and remove the /proc/bus/usb entry */
923 if (dev
->devnum
> 0) {
924 clear_bit(dev
->devnum
, dev
->bus
->devmap
.devicemap
);
925 usbfs_remove_device(dev
);
927 device_unregister(&dev
->dev
);
929 /* Decrement the reference count, it'll auto free everything when */
930 /* it hits 0 which could very well be now */
935 * usb_connect - pick device address (usbcore-internal)
936 * @dev: newly detected device (in DEFAULT state)
938 * Picks a device address. It's up to the hub (or root hub) driver
939 * to handle and manage enumeration, starting from the DEFAULT state.
940 * Only hub drivers (including virtual root hub drivers for host
941 * controllers) should ever call this.
943 void usb_connect(struct usb_device
*dev
)
946 // FIXME needs locking for SMP!!
947 /* why? this is called only from the hub thread,
948 * which hopefully doesn't run on multiple CPU's simultaneously 8-)
949 * ... it's also called from modprobe/rmmod/apmd threads as part
950 * of virtual root hub init/reinit. In the init case, the hub code
951 * won't have seen this, but not so for reinit ...
953 dev
->descriptor
.bMaxPacketSize0
= 8; /* Start off at 8 bytes */
955 /* Try to allocate the next devnum beginning at bus->devnum_next. */
956 devnum
= find_next_zero_bit(dev
->bus
->devmap
.devicemap
, 128, dev
->bus
->devnum_next
);
958 devnum
= find_next_zero_bit(dev
->bus
->devmap
.devicemap
, 128, 1);
960 dev
->bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
963 set_bit(devnum
, dev
->bus
->devmap
.devicemap
);
964 dev
->devnum
= devnum
;
969 // hub-only!! ... and only exported for reset/reinit path.
970 // otherwise used internally, for usb_new_device()
971 int usb_set_address(struct usb_device
*dev
)
975 if (dev
->devnum
== 0)
977 if (dev
->state
!= USB_STATE_DEFAULT
&& dev
->state
!= USB_STATE_ADDRESS
)
979 retval
= usb_control_msg(dev
, usb_snddefctrl(dev
), USB_REQ_SET_ADDRESS
,
980 0, dev
->devnum
, 0, NULL
, 0, HZ
* USB_CTRL_SET_TIMEOUT
);
982 dev
->state
= USB_STATE_ADDRESS
;
987 /* improve on the default device description, if we can ... and
988 * while we're at it, maybe show the vendor and product strings.
990 static void set_device_description (struct usb_device
*dev
)
993 int mfgr
= dev
->descriptor
.iManufacturer
;
994 int prod
= dev
->descriptor
.iProduct
;
995 int vendor_id
= dev
->descriptor
.idVendor
;
996 int product_id
= dev
->descriptor
.idProduct
;
997 char *mfgr_str
, *prod_str
;
999 /* set default; keep it if there are no strings, or kmalloc fails */
1000 sprintf (dev
->dev
.name
, "USB device %04x:%04x",
1001 vendor_id
, product_id
);
1003 if (!(buf
= kmalloc(256 * 2, GFP_KERNEL
)))
1006 prod_str
= (char *) buf
;
1007 mfgr_str
= (char *) buf
+ 256;
1009 if (prod
&& usb_string (dev
, prod
, prod_str
, 256) > 0) {
1011 dev_printk (KERN_INFO
, &dev
->dev
, "Product: %s\n", prod_str
);
1017 if (mfgr
&& usb_string (dev
, mfgr
, mfgr_str
, 256) > 0) {
1019 dev_printk (KERN_INFO
, &dev
->dev
, "Manufacturer: %s\n", mfgr_str
);
1025 /* much like pci ... describe as either:
1026 * - both strings: 'product descr (vendor descr)'
1027 * - product only: 'product descr (USB device vvvv:pppp)'
1028 * - vendor only: 'USB device vvvv:pppp (vendor descr)'
1029 * - neither string: 'USB device vvvv:pppp'
1032 if (prod_str
&& mfgr_str
) {
1033 snprintf(dev
->dev
.name
, sizeof dev
->dev
.name
,
1034 "%s (%s)", prod_str
, mfgr_str
);
1035 } else if (prod_str
) {
1036 snprintf(dev
->dev
.name
, sizeof dev
->dev
.name
,
1037 "%s (USB device %04x:%04x)",
1038 prod_str
, vendor_id
, product_id
);
1039 } else if (mfgr_str
) {
1040 snprintf(dev
->dev
.name
, sizeof dev
->dev
.name
,
1041 "USB device %04x:%04x (%s)",
1042 vendor_id
, product_id
, mfgr_str
);
1049 * By the time we get here, we chose a new device address
1050 * and is in the default state. We need to identify the thing and
1051 * get the ball rolling..
1053 * Returns 0 for success, != 0 for error.
1055 * This call is synchronous, and may not be used in an interrupt context.
1057 * Only hub drivers (including virtual root hub drivers for host
1058 * controllers) should ever call this.
1060 #define NEW_DEVICE_RETRYS 2
1061 #define SET_ADDRESS_RETRYS 2
1062 int usb_new_device(struct usb_device
*dev
, struct device
*parent
)
1069 * Set the driver for the usb device to point to the "generic" driver.
1070 * This prevents the main usb device from being sent to the usb bus
1071 * probe function. Yes, it's a hack, but a nice one :)
1073 * Do it asap, so more driver model stuff (like the device.h message
1074 * utilities) can be used in hcd submit/unlink code paths.
1076 usb_generic_driver
.bus
= &usb_bus_type
;
1077 dev
->dev
.parent
= parent
;
1078 dev
->dev
.driver
= &usb_generic_driver
;
1079 dev
->dev
.bus
= &usb_bus_type
;
1080 dev
->dev
.release
= usb_release_dev
;
1081 dev
->dev
.driver_data
= &usb_generic_driver_data
;
1083 if (dev
->dev
.bus_id
[0] == 0)
1084 sprintf (&dev
->dev
.bus_id
[0], "%d-%s",
1085 dev
->bus
->busnum
, dev
->devpath
);
1087 /* dma masks come from the controller; readonly, except to hcd */
1088 dev
->dev
.dma_mask
= parent
->dma_mask
;
1090 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
1091 * it's fixed size except for full speed devices.
1093 switch (dev
->speed
) {
1094 case USB_SPEED_HIGH
: /* fixed at 64 */
1097 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
1098 /* to determine the ep0 maxpacket size, read the first 8
1099 * bytes from the device descriptor to get bMaxPacketSize0;
1100 * then correct our initial (small) guess.
1103 case USB_SPEED_LOW
: /* fixed at 8 */
1109 dev
->epmaxpacketin
[0] = i
;
1110 dev
->epmaxpacketout
[0] = i
;
1112 for (i
= 0; i
< NEW_DEVICE_RETRYS
; ++i
) {
1114 for (j
= 0; j
< SET_ADDRESS_RETRYS
; ++j
) {
1115 err
= usb_set_address(dev
);
1121 dev_err(&dev
->dev
, "USB device not accepting new address=%d (error=%d)\n",
1123 dev
->state
= USB_STATE_DEFAULT
;
1124 clear_bit(dev
->devnum
, dev
->bus
->devmap
.devicemap
);
1129 wait_ms(10); /* Let the SET_ADDRESS settle */
1131 /* high and low speed devices don't need this... */
1132 err
= usb_get_descriptor(dev
, USB_DT_DEVICE
, 0, &dev
->descriptor
, 8);
1140 dev_err(&dev
->dev
, "USB device not responding, giving up (error=%d)\n", err
);
1142 dev_err(&dev
->dev
, "USB device descriptor short read (expected %i, got %i)\n", 8, err
);
1143 clear_bit(dev
->devnum
, dev
->bus
->devmap
.devicemap
);
1147 if (dev
->speed
== USB_SPEED_FULL
) {
1148 dev
->epmaxpacketin
[0] = dev
->descriptor
.bMaxPacketSize0
;
1149 dev
->epmaxpacketout
[0] = dev
->descriptor
.bMaxPacketSize0
;
1152 /* USB device state == addressed ... still not usable */
1154 err
= usb_get_device_descriptor(dev
);
1155 if (err
< (signed)sizeof(dev
->descriptor
)) {
1157 dev_err(&dev
->dev
, "unable to get device descriptor (error=%d)\n", err
);
1159 dev_err(&dev
->dev
, "USB device descriptor short read (expected %Zi, got %i)\n",
1160 sizeof(dev
->descriptor
), err
);
1162 clear_bit(dev
->devnum
, dev
->bus
->devmap
.devicemap
);
1167 err
= usb_get_configuration(dev
);
1169 dev_err(&dev
->dev
, "unable to get device %d configuration (error=%d)\n",
1171 clear_bit(dev
->devnum
, dev
->bus
->devmap
.devicemap
);
1176 /* we set the default configuration here */
1177 err
= usb_set_configuration(dev
, dev
->config
[0].desc
.bConfigurationValue
);
1179 dev_err(&dev
->dev
, "failed to set device %d default configuration (error=%d)\n",
1181 clear_bit(dev
->devnum
, dev
->bus
->devmap
.devicemap
);
1186 /* USB device state == configured ... tell the world! */
1188 dev_dbg(&dev
->dev
, "new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
1189 dev
->descriptor
.iManufacturer
, dev
->descriptor
.iProduct
, dev
->descriptor
.iSerialNumber
);
1190 set_device_description (dev
);
1193 if (dev
->descriptor
.iSerialNumber
)
1194 usb_show_string(dev
, "SerialNumber", dev
->descriptor
.iSerialNumber
);
1197 /* put into sysfs, with device and config specific files */
1198 err
= device_add (&dev
->dev
);
1201 usb_create_driverfs_dev_files (dev
);
1203 /* Register all of the interfaces for this device with the driver core.
1204 * Remember, interfaces get bound to drivers, not devices. */
1205 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++) {
1206 struct usb_interface
*interface
= &dev
->actconfig
->interface
[i
];
1207 struct usb_interface_descriptor
*desc
;
1209 desc
= &interface
->altsetting
[interface
->act_altsetting
].desc
;
1210 interface
->dev
.parent
= &dev
->dev
;
1211 interface
->dev
.driver
= NULL
;
1212 interface
->dev
.bus
= &usb_bus_type
;
1213 interface
->dev
.dma_mask
= parent
->dma_mask
;
1214 sprintf (&interface
->dev
.bus_id
[0], "%d-%s:%d",
1215 dev
->bus
->busnum
, dev
->devpath
,
1216 desc
->bInterfaceNumber
);
1217 if (!desc
->iInterface
1218 || usb_string (dev
, desc
->iInterface
,
1219 interface
->dev
.name
,
1220 sizeof interface
->dev
.name
) <= 0) {
1221 /* typically devices won't bother with interface
1222 * descriptions; this is the normal case. an
1223 * interface's driver might describe it better.
1224 * (also: iInterface is per-altsetting ...)
1226 sprintf (&interface
->dev
.name
[0],
1227 "usb-%s-%s interface %d",
1228 dev
->bus
->bus_name
, dev
->devpath
,
1229 desc
->bInterfaceNumber
);
1231 dev_dbg (&dev
->dev
, "%s - registering interface %s\n", __FUNCTION__
, interface
->dev
.bus_id
);
1232 device_add (&interface
->dev
);
1233 usb_create_driverfs_intf_files (interface
);
1236 /* add a /proc/bus/usb entry */
1237 usbfs_add_device(dev
);
1243 * usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
1244 * @dev: device the buffer will be used with
1245 * @size: requested buffer size
1246 * @mem_flags: affect whether allocation may block
1247 * @dma: used to return DMA address of buffer
1249 * Return value is either null (indicating no buffer could be allocated), or
1250 * the cpu-space pointer to a buffer that may be used to perform DMA to the
1251 * specified device. Such cpu-space buffers are returned along with the DMA
1252 * address (through the pointer provided).
1254 * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags
1255 * to avoid behaviors like using "DMA bounce buffers", or tying down I/O
1256 * mapping hardware for long idle periods. The implementation varies between
1257 * platforms, depending on details of how DMA will work to this device.
1258 * Using these buffers also helps prevent cacheline sharing problems on
1259 * architectures where CPU caches are not DMA-coherent.
1261 * When the buffer is no longer used, free it with usb_buffer_free().
1263 void *usb_buffer_alloc (
1264 struct usb_device
*dev
,
1270 if (!dev
|| !dev
->bus
|| !dev
->bus
->op
|| !dev
->bus
->op
->buffer_alloc
)
1272 return dev
->bus
->op
->buffer_alloc (dev
->bus
, size
, mem_flags
, dma
);
1276 * usb_buffer_free - free memory allocated with usb_buffer_alloc()
1277 * @dev: device the buffer was used with
1278 * @size: requested buffer size
1279 * @addr: CPU address of buffer
1280 * @dma: DMA address of buffer
1282 * This reclaims an I/O buffer, letting it be reused. The memory must have
1283 * been allocated using usb_buffer_alloc(), and the parameters must match
1284 * those provided in that allocation request.
1286 void usb_buffer_free (
1287 struct usb_device
*dev
,
1293 if (!dev
|| !dev
->bus
|| !dev
->bus
->op
|| !dev
->bus
->op
->buffer_free
)
1295 dev
->bus
->op
->buffer_free (dev
->bus
, size
, addr
, dma
);
1299 * usb_buffer_map - create DMA mapping(s) for an urb
1300 * @urb: urb whose transfer_buffer/setup_packet will be mapped
1302 * Return value is either null (indicating no buffer could be mapped), or
1303 * the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are
1304 * added to urb->transfer_flags if the operation succeeds. If the device
1305 * is connected to this system through a non-DMA controller, this operation
1308 * This call would normally be used for an urb which is reused, perhaps
1309 * as the target of a large periodic transfer, with usb_buffer_dmasync()
1310 * calls to synchronize memory and dma state.
1312 * Reverse the effect of this call with usb_buffer_unmap().
1314 struct urb
*usb_buffer_map (struct urb
*urb
)
1316 struct usb_bus
*bus
;
1317 struct device
*controller
;
1321 || !(bus
= urb
->dev
->bus
)
1322 || !(controller
= bus
->controller
))
1325 if (controller
->dma_mask
) {
1326 urb
->transfer_dma
= dma_map_single (controller
,
1327 urb
->transfer_buffer
, urb
->transfer_buffer_length
,
1328 usb_pipein (urb
->pipe
)
1329 ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1330 if (usb_pipecontrol (urb
->pipe
))
1331 urb
->setup_dma
= dma_map_single (controller
,
1333 sizeof (struct usb_ctrlrequest
),
1335 // FIXME generic api broken like pci, can't report errors
1336 // if (urb->transfer_dma == DMA_ADDR_INVALID) return 0;
1338 urb
->transfer_dma
= ~0;
1339 urb
->transfer_flags
|= (URB_NO_TRANSFER_DMA_MAP
1340 | URB_NO_SETUP_DMA_MAP
);
1345 * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s)
1346 * @urb: urb whose transfer_buffer/setup_packet will be synchronized
1348 void usb_buffer_dmasync (struct urb
*urb
)
1350 struct usb_bus
*bus
;
1351 struct device
*controller
;
1354 || !(urb
->transfer_flags
& URB_NO_TRANSFER_DMA_MAP
)
1356 || !(bus
= urb
->dev
->bus
)
1357 || !(controller
= bus
->controller
))
1360 if (controller
->dma_mask
) {
1361 dma_sync_single (controller
,
1362 urb
->transfer_dma
, urb
->transfer_buffer_length
,
1363 usb_pipein (urb
->pipe
)
1364 ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1365 if (usb_pipecontrol (urb
->pipe
))
1366 dma_sync_single (controller
,
1368 sizeof (struct usb_ctrlrequest
),
1374 * usb_buffer_unmap - free DMA mapping(s) for an urb
1375 * @urb: urb whose transfer_buffer will be unmapped
1377 * Reverses the effect of usb_buffer_map().
1379 void usb_buffer_unmap (struct urb
*urb
)
1381 struct usb_bus
*bus
;
1382 struct device
*controller
;
1385 || !(urb
->transfer_flags
& URB_NO_TRANSFER_DMA_MAP
)
1387 || !(bus
= urb
->dev
->bus
)
1388 || !(controller
= bus
->controller
))
1391 if (controller
->dma_mask
) {
1392 dma_unmap_single (controller
,
1393 urb
->transfer_dma
, urb
->transfer_buffer_length
,
1394 usb_pipein (urb
->pipe
)
1395 ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1396 if (usb_pipecontrol (urb
->pipe
))
1397 dma_unmap_single (controller
,
1399 sizeof (struct usb_ctrlrequest
),
1402 urb
->transfer_flags
&= ~(URB_NO_TRANSFER_DMA_MAP
1403 | URB_NO_SETUP_DMA_MAP
);
1407 * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint
1408 * @dev: device to which the scatterlist will be mapped
1409 * @pipe: endpoint defining the mapping direction
1410 * @sg: the scatterlist to map
1411 * @nents: the number of entries in the scatterlist
1413 * Return value is either < 0 (indicating no buffers could be mapped), or
1414 * the number of DMA mapping array entries in the scatterlist.
1416 * The caller is responsible for placing the resulting DMA addresses from
1417 * the scatterlist into URB transfer buffer pointers, and for setting the
1418 * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs.
1420 * Top I/O rates come from queuing URBs, instead of waiting for each one
1421 * to complete before starting the next I/O. This is particularly easy
1422 * to do with scatterlists. Just allocate and submit one URB for each DMA
1423 * mapping entry returned, stopping on the first error or when all succeed.
1424 * Better yet, use the usb_sg_*() calls, which do that (and more) for you.
1426 * This call would normally be used when translating scatterlist requests,
1427 * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it
1428 * may be able to coalesce mappings for improved I/O efficiency.
1430 * Reverse the effect of this call with usb_buffer_unmap_sg().
1432 int usb_buffer_map_sg (struct usb_device
*dev
, unsigned pipe
,
1433 struct scatterlist
*sg
, int nents
)
1435 struct usb_bus
*bus
;
1436 struct device
*controller
;
1439 || usb_pipecontrol (pipe
)
1440 || !(bus
= dev
->bus
)
1441 || !(controller
= bus
->controller
)
1442 || !controller
->dma_mask
)
1445 // FIXME generic api broken like pci, can't report errors
1446 return dma_map_sg (controller
, sg
, nents
,
1447 usb_pipein (pipe
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1451 * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s)
1452 * @dev: device to which the scatterlist will be mapped
1453 * @pipe: endpoint defining the mapping direction
1454 * @sg: the scatterlist to synchronize
1455 * @n_hw_ents: the positive return value from usb_buffer_map_sg
1457 * Use this when you are re-using a scatterlist's data buffers for
1458 * another USB request.
1460 void usb_buffer_dmasync_sg (struct usb_device
*dev
, unsigned pipe
,
1461 struct scatterlist
*sg
, int n_hw_ents
)
1463 struct usb_bus
*bus
;
1464 struct device
*controller
;
1467 || !(bus
= dev
->bus
)
1468 || !(controller
= bus
->controller
)
1469 || !controller
->dma_mask
)
1472 dma_sync_sg (controller
, sg
, n_hw_ents
,
1473 usb_pipein (pipe
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1477 * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist
1478 * @dev: device to which the scatterlist will be mapped
1479 * @pipe: endpoint defining the mapping direction
1480 * @sg: the scatterlist to unmap
1481 * @n_hw_ents: the positive return value from usb_buffer_map_sg
1483 * Reverses the effect of usb_buffer_map_sg().
1485 void usb_buffer_unmap_sg (struct usb_device
*dev
, unsigned pipe
,
1486 struct scatterlist
*sg
, int n_hw_ents
)
1488 struct usb_bus
*bus
;
1489 struct device
*controller
;
1492 || !(bus
= dev
->bus
)
1493 || !(controller
= bus
->controller
)
1494 || !controller
->dma_mask
)
1497 dma_unmap_sg (controller
, sg
, n_hw_ents
,
1498 usb_pipein (pipe
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
1502 struct bus_type usb_bus_type
= {
1504 .match
= usb_device_match
,
1505 .hotplug
= usb_hotplug
,
1510 static int __init
usb_setup_disable(char *str
)
1516 /* format to disable USB on kernel command line is: nousb */
1517 __setup("nousb", usb_setup_disable
);
1522 * for external read access to <nousb>
1524 int usb_disabled(void)
1532 static int __init
usb_init(void)
1535 info("USB support disabled\n");
1539 bus_register(&usb_bus_type
);
1545 driver_register(&usb_generic_driver
);
1553 static void __exit
usb_exit(void)
1555 /* This will matter if shutdown/reboot does exitcalls. */
1559 driver_unregister(&usb_generic_driver
);
1560 usb_major_cleanup();
1564 bus_unregister(&usb_bus_type
);
1567 subsys_initcall(usb_init
);
1568 module_exit(usb_exit
);
1571 * USB may be built into the kernel or be built as modules.
1572 * These symbols are exported for device (or host controller)
1573 * driver modules to use.
1575 EXPORT_SYMBOL(usb_epnum_to_ep_desc
);
1577 EXPORT_SYMBOL(usb_register
);
1578 EXPORT_SYMBOL(usb_deregister
);
1579 EXPORT_SYMBOL(usb_disabled
);
1581 EXPORT_SYMBOL(usb_device_probe
);
1582 EXPORT_SYMBOL(usb_device_remove
);
1584 EXPORT_SYMBOL(usb_alloc_dev
);
1585 EXPORT_SYMBOL(usb_put_dev
);
1586 EXPORT_SYMBOL(usb_get_dev
);
1587 EXPORT_SYMBOL(usb_hub_tt_clear_buffer
);
1589 EXPORT_SYMBOL(usb_driver_claim_interface
);
1590 EXPORT_SYMBOL(usb_interface_claimed
);
1591 EXPORT_SYMBOL(usb_driver_release_interface
);
1592 EXPORT_SYMBOL(usb_match_id
);
1593 EXPORT_SYMBOL(usb_find_interface
);
1594 EXPORT_SYMBOL(usb_ifnum_to_if
);
1596 EXPORT_SYMBOL(usb_new_device
);
1597 EXPORT_SYMBOL(usb_reset_device
);
1598 EXPORT_SYMBOL(usb_connect
);
1599 EXPORT_SYMBOL(usb_disconnect
);
1601 EXPORT_SYMBOL(__usb_get_extra_descriptor
);
1603 EXPORT_SYMBOL(usb_find_device
);
1604 EXPORT_SYMBOL(usb_get_current_frame_number
);
1606 EXPORT_SYMBOL (usb_buffer_alloc
);
1607 EXPORT_SYMBOL (usb_buffer_free
);
1609 EXPORT_SYMBOL (usb_buffer_map
);
1610 EXPORT_SYMBOL (usb_buffer_dmasync
);
1611 EXPORT_SYMBOL (usb_buffer_unmap
);
1613 EXPORT_SYMBOL (usb_buffer_map_sg
);
1614 EXPORT_SYMBOL (usb_buffer_dmasync_sg
);
1615 EXPORT_SYMBOL (usb_buffer_unmap_sg
);
1617 MODULE_LICENSE("GPL");