2 * message.c - synchronous message handling
5 #include <linux/pci.h> /* for scatterlist macros */
7 #include <linux/module.h>
8 #include <linux/slab.h>
9 #include <linux/init.h>
11 #include <linux/timer.h>
12 #include <linux/ctype.h>
13 #include <linux/device.h>
14 #include <asm/byteorder.h>
15 #include <asm/scatterlist.h>
17 #include "hcd.h" /* for usbcore internals */
20 static void usb_api_blocking_completion(struct urb
*urb
, struct pt_regs
*regs
)
22 complete((struct completion
*)urb
->context
);
26 static void timeout_kill(unsigned long data
)
28 struct urb
*urb
= (struct urb
*) data
;
33 // Starts urb and waits for completion or timeout
34 // note that this call is NOT interruptible, while
35 // many device driver i/o requests should be interruptible
36 static int usb_start_wait_urb(struct urb
*urb
, int timeout
, int* actual_length
)
38 struct completion done
;
39 struct timer_list timer
;
42 init_completion(&done
);
44 urb
->actual_length
= 0;
45 status
= usb_submit_urb(urb
, GFP_NOIO
);
50 timer
.expires
= jiffies
+ msecs_to_jiffies(timeout
);
51 timer
.data
= (unsigned long)urb
;
52 timer
.function
= timeout_kill
;
53 /* grr. timeout _should_ include submit delays. */
56 wait_for_completion(&done
);
58 /* note: HCDs return ETIMEDOUT for other reasons too */
59 if (status
== -ECONNRESET
) {
60 dev_dbg(&urb
->dev
->dev
,
61 "%s timed out on ep%d%s len=%d/%d\n",
63 usb_pipeendpoint(urb
->pipe
),
64 usb_pipein(urb
->pipe
) ? "in" : "out",
66 urb
->transfer_buffer_length
68 if (urb
->actual_length
> 0)
74 del_timer_sync(&timer
);
78 *actual_length
= urb
->actual_length
;
83 /*-------------------------------------------------------------------*/
84 // returns status (negative) or length (positive)
85 static int usb_internal_control_msg(struct usb_device
*usb_dev
,
87 struct usb_ctrlrequest
*cmd
,
88 void *data
, int len
, int timeout
)
94 urb
= usb_alloc_urb(0, GFP_NOIO
);
98 usb_fill_control_urb(urb
, usb_dev
, pipe
, (unsigned char *)cmd
, data
,
99 len
, usb_api_blocking_completion
, NULL
);
101 retv
= usb_start_wait_urb(urb
, timeout
, &length
);
109 * usb_control_msg - Builds a control urb, sends it off and waits for completion
110 * @dev: pointer to the usb device to send the message to
111 * @pipe: endpoint "pipe" to send the message to
112 * @request: USB message request value
113 * @requesttype: USB message request type value
114 * @value: USB message value
115 * @index: USB message index value
116 * @data: pointer to the data to send
117 * @size: length in bytes of the data to send
118 * @timeout: time in msecs to wait for the message to complete before
119 * timing out (if 0 the wait is forever)
120 * Context: !in_interrupt ()
122 * This function sends a simple control message to a specified endpoint
123 * and waits for the message to complete, or timeout.
125 * If successful, it returns the number of bytes transferred, otherwise a negative error number.
127 * Don't use this function from within an interrupt context, like a
128 * bottom half handler. If you need an asynchronous message, or need to send
129 * a message from within interrupt context, use usb_submit_urb()
130 * If a thread in your driver uses this call, make sure your disconnect()
131 * method can wait for it to complete. Since you don't have a handle on
132 * the URB used, you can't cancel the request.
134 int usb_control_msg(struct usb_device
*dev
, unsigned int pipe
, __u8 request
, __u8 requesttype
,
135 __u16 value
, __u16 index
, void *data
, __u16 size
, int timeout
)
137 struct usb_ctrlrequest
*dr
= kmalloc(sizeof(struct usb_ctrlrequest
), GFP_NOIO
);
143 dr
->bRequestType
= requesttype
;
144 dr
->bRequest
= request
;
145 dr
->wValue
= cpu_to_le16p(&value
);
146 dr
->wIndex
= cpu_to_le16p(&index
);
147 dr
->wLength
= cpu_to_le16p(&size
);
149 //dbg("usb_control_msg");
151 ret
= usb_internal_control_msg(dev
, pipe
, dr
, data
, size
, timeout
);
160 * usb_interrupt_msg - Builds an interrupt urb, sends it off and waits for completion
161 * @usb_dev: pointer to the usb device to send the message to
162 * @pipe: endpoint "pipe" to send the message to
163 * @data: pointer to the data to send
164 * @len: length in bytes of the data to send
165 * @actual_length: pointer to a location to put the actual length transferred in bytes
166 * @timeout: time in msecs to wait for the message to complete before
167 * timing out (if 0 the wait is forever)
168 * Context: !in_interrupt ()
170 * This function sends a simple interrupt message to a specified endpoint and
171 * waits for the message to complete, or timeout.
173 * If successful, it returns 0, otherwise a negative error number. The number
174 * of actual bytes transferred will be stored in the actual_length paramater.
176 * Don't use this function from within an interrupt context, like a bottom half
177 * handler. If you need an asynchronous message, or need to send a message
178 * from within interrupt context, use usb_submit_urb() If a thread in your
179 * driver uses this call, make sure your disconnect() method can wait for it to
180 * complete. Since you don't have a handle on the URB used, you can't cancel
183 int usb_interrupt_msg(struct usb_device
*usb_dev
, unsigned int pipe
,
184 void *data
, int len
, int *actual_length
, int timeout
)
186 return usb_bulk_msg(usb_dev
, pipe
, data
, len
, actual_length
, timeout
);
188 EXPORT_SYMBOL_GPL(usb_interrupt_msg
);
191 * usb_bulk_msg - Builds a bulk urb, sends it off and waits for completion
192 * @usb_dev: pointer to the usb device to send the message to
193 * @pipe: endpoint "pipe" to send the message to
194 * @data: pointer to the data to send
195 * @len: length in bytes of the data to send
196 * @actual_length: pointer to a location to put the actual length transferred in bytes
197 * @timeout: time in msecs to wait for the message to complete before
198 * timing out (if 0 the wait is forever)
199 * Context: !in_interrupt ()
201 * This function sends a simple bulk message to a specified endpoint
202 * and waits for the message to complete, or timeout.
204 * If successful, it returns 0, otherwise a negative error number.
205 * The number of actual bytes transferred will be stored in the
206 * actual_length paramater.
208 * Don't use this function from within an interrupt context, like a
209 * bottom half handler. If you need an asynchronous message, or need to
210 * send a message from within interrupt context, use usb_submit_urb()
211 * If a thread in your driver uses this call, make sure your disconnect()
212 * method can wait for it to complete. Since you don't have a handle on
213 * the URB used, you can't cancel the request.
215 * Because there is no usb_interrupt_msg() and no USBDEVFS_INTERRUPT
216 * ioctl, users are forced to abuse this routine by using it to submit
217 * URBs for interrupt endpoints. We will take the liberty of creating
218 * an interrupt URB (with the default interval) if the target is an
219 * interrupt endpoint.
221 int usb_bulk_msg(struct usb_device
*usb_dev
, unsigned int pipe
,
222 void *data
, int len
, int *actual_length
, int timeout
)
225 struct usb_host_endpoint
*ep
;
227 ep
= (usb_pipein(pipe
) ? usb_dev
->ep_in
: usb_dev
->ep_out
)
228 [usb_pipeendpoint(pipe
)];
232 urb
= usb_alloc_urb(0, GFP_KERNEL
);
236 if ((ep
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) ==
237 USB_ENDPOINT_XFER_INT
) {
238 pipe
= (pipe
& ~(3 << 30)) | (PIPE_INTERRUPT
<< 30);
239 usb_fill_int_urb(urb
, usb_dev
, pipe
, data
, len
,
240 usb_api_blocking_completion
, NULL
,
243 usb_fill_bulk_urb(urb
, usb_dev
, pipe
, data
, len
,
244 usb_api_blocking_completion
, NULL
);
246 return usb_start_wait_urb(urb
, timeout
, actual_length
);
249 /*-------------------------------------------------------------------*/
251 static void sg_clean (struct usb_sg_request
*io
)
254 while (io
->entries
--)
255 usb_free_urb (io
->urbs
[io
->entries
]);
259 if (io
->dev
->dev
.dma_mask
!= NULL
)
260 usb_buffer_unmap_sg (io
->dev
, io
->pipe
, io
->sg
, io
->nents
);
264 static void sg_complete (struct urb
*urb
, struct pt_regs
*regs
)
266 struct usb_sg_request
*io
= (struct usb_sg_request
*) urb
->context
;
268 spin_lock (&io
->lock
);
270 /* In 2.5 we require hcds' endpoint queues not to progress after fault
271 * reports, until the completion callback (this!) returns. That lets
272 * device driver code (like this routine) unlink queued urbs first,
273 * if it needs to, since the HC won't work on them at all. So it's
274 * not possible for page N+1 to overwrite page N, and so on.
276 * That's only for "hard" faults; "soft" faults (unlinks) sometimes
277 * complete before the HCD can get requests away from hardware,
278 * though never during cleanup after a hard fault.
281 && (io
->status
!= -ECONNRESET
282 || urb
->status
!= -ECONNRESET
)
283 && urb
->actual_length
) {
284 dev_err (io
->dev
->bus
->controller
,
285 "dev %s ep%d%s scatterlist error %d/%d\n",
287 usb_pipeendpoint (urb
->pipe
),
288 usb_pipein (urb
->pipe
) ? "in" : "out",
289 urb
->status
, io
->status
);
293 if (io
->status
== 0 && urb
->status
&& urb
->status
!= -ECONNRESET
) {
294 int i
, found
, status
;
296 io
->status
= urb
->status
;
298 /* the previous urbs, and this one, completed already.
299 * unlink pending urbs so they won't rx/tx bad data.
300 * careful: unlink can sometimes be synchronous...
302 spin_unlock (&io
->lock
);
303 for (i
= 0, found
= 0; i
< io
->entries
; i
++) {
304 if (!io
->urbs
[i
] || !io
->urbs
[i
]->dev
)
307 status
= usb_unlink_urb (io
->urbs
[i
]);
308 if (status
!= -EINPROGRESS
311 dev_err (&io
->dev
->dev
,
312 "%s, unlink --> %d\n",
313 __FUNCTION__
, status
);
314 } else if (urb
== io
->urbs
[i
])
317 spin_lock (&io
->lock
);
321 /* on the last completion, signal usb_sg_wait() */
322 io
->bytes
+= urb
->actual_length
;
325 complete (&io
->complete
);
327 spin_unlock (&io
->lock
);
332 * usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request
333 * @io: request block being initialized. until usb_sg_wait() returns,
334 * treat this as a pointer to an opaque block of memory,
335 * @dev: the usb device that will send or receive the data
336 * @pipe: endpoint "pipe" used to transfer the data
337 * @period: polling rate for interrupt endpoints, in frames or
338 * (for high speed endpoints) microframes; ignored for bulk
339 * @sg: scatterlist entries
340 * @nents: how many entries in the scatterlist
341 * @length: how many bytes to send from the scatterlist, or zero to
342 * send every byte identified in the list.
343 * @mem_flags: SLAB_* flags affecting memory allocations in this call
345 * Returns zero for success, else a negative errno value. This initializes a
346 * scatter/gather request, allocating resources such as I/O mappings and urb
347 * memory (except maybe memory used by USB controller drivers).
349 * The request must be issued using usb_sg_wait(), which waits for the I/O to
350 * complete (or to be canceled) and then cleans up all resources allocated by
353 * The request may be canceled with usb_sg_cancel(), either before or after
354 * usb_sg_wait() is called.
357 struct usb_sg_request
*io
,
358 struct usb_device
*dev
,
361 struct scatterlist
*sg
,
371 if (!io
|| !dev
|| !sg
372 || usb_pipecontrol (pipe
)
373 || usb_pipeisoc (pipe
)
377 spin_lock_init (&io
->lock
);
383 /* not all host controllers use DMA (like the mainstream pci ones);
384 * they can use PIO (sl811) or be software over another transport.
386 dma
= (dev
->dev
.dma_mask
!= NULL
);
388 io
->entries
= usb_buffer_map_sg (dev
, pipe
, sg
, nents
);
392 /* initialize all the urbs we'll use */
393 if (io
->entries
<= 0)
396 io
->count
= io
->entries
;
397 io
->urbs
= kmalloc (io
->entries
* sizeof *io
->urbs
, mem_flags
);
401 urb_flags
= URB_NO_TRANSFER_DMA_MAP
| URB_NO_INTERRUPT
;
402 if (usb_pipein (pipe
))
403 urb_flags
|= URB_SHORT_NOT_OK
;
405 for (i
= 0; i
< io
->entries
; i
++) {
408 io
->urbs
[i
] = usb_alloc_urb (0, mem_flags
);
414 io
->urbs
[i
]->dev
= NULL
;
415 io
->urbs
[i
]->pipe
= pipe
;
416 io
->urbs
[i
]->interval
= period
;
417 io
->urbs
[i
]->transfer_flags
= urb_flags
;
419 io
->urbs
[i
]->complete
= sg_complete
;
420 io
->urbs
[i
]->context
= io
;
421 io
->urbs
[i
]->status
= -EINPROGRESS
;
422 io
->urbs
[i
]->actual_length
= 0;
425 /* hc may use _only_ transfer_dma */
426 io
->urbs
[i
]->transfer_dma
= sg_dma_address (sg
+ i
);
427 len
= sg_dma_len (sg
+ i
);
429 /* hc may use _only_ transfer_buffer */
430 io
->urbs
[i
]->transfer_buffer
=
431 page_address (sg
[i
].page
) + sg
[i
].offset
;
436 len
= min_t (unsigned, len
, length
);
441 io
->urbs
[i
]->transfer_buffer_length
= len
;
443 io
->urbs
[--i
]->transfer_flags
&= ~URB_NO_INTERRUPT
;
445 /* transaction state */
448 init_completion (&io
->complete
);
458 * usb_sg_wait - synchronously execute scatter/gather request
459 * @io: request block handle, as initialized with usb_sg_init().
460 * some fields become accessible when this call returns.
461 * Context: !in_interrupt ()
463 * This function blocks until the specified I/O operation completes. It
464 * leverages the grouping of the related I/O requests to get good transfer
465 * rates, by queueing the requests. At higher speeds, such queuing can
466 * significantly improve USB throughput.
468 * There are three kinds of completion for this function.
469 * (1) success, where io->status is zero. The number of io->bytes
470 * transferred is as requested.
471 * (2) error, where io->status is a negative errno value. The number
472 * of io->bytes transferred before the error is usually less
473 * than requested, and can be nonzero.
474 * (3) cancellation, a type of error with status -ECONNRESET that
475 * is initiated by usb_sg_cancel().
477 * When this function returns, all memory allocated through usb_sg_init() or
478 * this call will have been freed. The request block parameter may still be
479 * passed to usb_sg_cancel(), or it may be freed. It could also be
480 * reinitialized and then reused.
482 * Data Transfer Rates:
484 * Bulk transfers are valid for full or high speed endpoints.
485 * The best full speed data rate is 19 packets of 64 bytes each
486 * per frame, or 1216 bytes per millisecond.
487 * The best high speed data rate is 13 packets of 512 bytes each
488 * per microframe, or 52 KBytes per millisecond.
490 * The reason to use interrupt transfers through this API would most likely
491 * be to reserve high speed bandwidth, where up to 24 KBytes per millisecond
492 * could be transferred. That capability is less useful for low or full
493 * speed interrupt endpoints, which allow at most one packet per millisecond,
494 * of at most 8 or 64 bytes (respectively).
496 void usb_sg_wait (struct usb_sg_request
*io
)
498 int i
, entries
= io
->entries
;
500 /* queue the urbs. */
501 spin_lock_irq (&io
->lock
);
502 for (i
= 0; i
< entries
&& !io
->status
; i
++) {
505 io
->urbs
[i
]->dev
= io
->dev
;
506 retval
= usb_submit_urb (io
->urbs
[i
], SLAB_ATOMIC
);
508 /* after we submit, let completions or cancelations fire;
509 * we handshake using io->status.
511 spin_unlock_irq (&io
->lock
);
513 /* maybe we retrying will recover */
514 case -ENXIO
: // hc didn't queue this one
517 io
->urbs
[i
]->dev
= NULL
;
523 /* no error? continue immediately.
525 * NOTE: to work better with UHCI (4K I/O buffer may
526 * need 3K of TDs) it may be good to limit how many
527 * URBs are queued at once; N milliseconds?
533 /* fail any uncompleted urbs */
535 io
->urbs
[i
]->dev
= NULL
;
536 io
->urbs
[i
]->status
= retval
;
537 dev_dbg (&io
->dev
->dev
, "%s, submit --> %d\n",
538 __FUNCTION__
, retval
);
541 spin_lock_irq (&io
->lock
);
542 if (retval
&& (io
->status
== 0 || io
->status
== -ECONNRESET
))
545 io
->count
-= entries
- i
;
547 complete (&io
->complete
);
548 spin_unlock_irq (&io
->lock
);
550 /* OK, yes, this could be packaged as non-blocking.
551 * So could the submit loop above ... but it's easier to
552 * solve neither problem than to solve both!
554 wait_for_completion (&io
->complete
);
560 * usb_sg_cancel - stop scatter/gather i/o issued by usb_sg_wait()
561 * @io: request block, initialized with usb_sg_init()
563 * This stops a request after it has been started by usb_sg_wait().
564 * It can also prevents one initialized by usb_sg_init() from starting,
565 * so that call just frees resources allocated to the request.
567 void usb_sg_cancel (struct usb_sg_request
*io
)
571 spin_lock_irqsave (&io
->lock
, flags
);
573 /* shut everything down, if it didn't already */
577 io
->status
= -ECONNRESET
;
578 spin_unlock (&io
->lock
);
579 for (i
= 0; i
< io
->entries
; i
++) {
582 if (!io
->urbs
[i
]->dev
)
584 retval
= usb_unlink_urb (io
->urbs
[i
]);
585 if (retval
!= -EINPROGRESS
&& retval
!= -EBUSY
)
586 dev_warn (&io
->dev
->dev
, "%s, unlink --> %d\n",
587 __FUNCTION__
, retval
);
589 spin_lock (&io
->lock
);
591 spin_unlock_irqrestore (&io
->lock
, flags
);
594 /*-------------------------------------------------------------------*/
597 * usb_get_descriptor - issues a generic GET_DESCRIPTOR request
598 * @dev: the device whose descriptor is being retrieved
599 * @type: the descriptor type (USB_DT_*)
600 * @index: the number of the descriptor
601 * @buf: where to put the descriptor
602 * @size: how big is "buf"?
603 * Context: !in_interrupt ()
605 * Gets a USB descriptor. Convenience functions exist to simplify
606 * getting some types of descriptors. Use
607 * usb_get_string() or usb_string() for USB_DT_STRING.
608 * Device (USB_DT_DEVICE) and configuration descriptors (USB_DT_CONFIG)
609 * are part of the device structure.
610 * In addition to a number of USB-standard descriptors, some
611 * devices also use class-specific or vendor-specific descriptors.
613 * This call is synchronous, and may not be used in an interrupt context.
615 * Returns the number of bytes received on success, or else the status code
616 * returned by the underlying usb_control_msg() call.
618 int usb_get_descriptor(struct usb_device
*dev
, unsigned char type
, unsigned char index
, void *buf
, int size
)
623 memset(buf
,0,size
); // Make sure we parse really received data
625 for (i
= 0; i
< 3; ++i
) {
626 /* retry on length 0 or stall; some devices are flakey */
627 result
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
628 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
629 (type
<< 8) + index
, 0, buf
, size
,
630 USB_CTRL_GET_TIMEOUT
);
631 if (result
== 0 || result
== -EPIPE
)
633 if (result
> 1 && ((u8
*)buf
)[1] != type
) {
643 * usb_get_string - gets a string descriptor
644 * @dev: the device whose string descriptor is being retrieved
645 * @langid: code for language chosen (from string descriptor zero)
646 * @index: the number of the descriptor
647 * @buf: where to put the string
648 * @size: how big is "buf"?
649 * Context: !in_interrupt ()
651 * Retrieves a string, encoded using UTF-16LE (Unicode, 16 bits per character,
652 * in little-endian byte order).
653 * The usb_string() function will often be a convenient way to turn
654 * these strings into kernel-printable form.
656 * Strings may be referenced in device, configuration, interface, or other
657 * descriptors, and could also be used in vendor-specific ways.
659 * This call is synchronous, and may not be used in an interrupt context.
661 * Returns the number of bytes received on success, or else the status code
662 * returned by the underlying usb_control_msg() call.
664 static int usb_get_string(struct usb_device
*dev
, unsigned short langid
,
665 unsigned char index
, void *buf
, int size
)
670 for (i
= 0; i
< 3; ++i
) {
671 /* retry on length 0 or stall; some devices are flakey */
672 result
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
673 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
674 (USB_DT_STRING
<< 8) + index
, langid
, buf
, size
,
675 USB_CTRL_GET_TIMEOUT
);
676 if (!(result
== 0 || result
== -EPIPE
))
682 static void usb_try_string_workarounds(unsigned char *buf
, int *length
)
684 int newlength
, oldlength
= *length
;
686 for (newlength
= 2; newlength
+ 1 < oldlength
; newlength
+= 2)
687 if (!isprint(buf
[newlength
]) || buf
[newlength
+ 1])
696 static int usb_string_sub(struct usb_device
*dev
, unsigned int langid
,
697 unsigned int index
, unsigned char *buf
)
701 /* Try to read the string descriptor by asking for the maximum
702 * possible number of bytes */
703 rc
= usb_get_string(dev
, langid
, index
, buf
, 255);
705 /* If that failed try to read the descriptor length, then
706 * ask for just that many bytes */
708 rc
= usb_get_string(dev
, langid
, index
, buf
, 2);
710 rc
= usb_get_string(dev
, langid
, index
, buf
, buf
[0]);
714 if (!buf
[0] && !buf
[1])
715 usb_try_string_workarounds(buf
, &rc
);
717 /* There might be extra junk at the end of the descriptor */
721 rc
= rc
- (rc
& 1); /* force a multiple of two */
725 rc
= (rc
< 0 ? rc
: -EINVAL
);
731 * usb_string - returns ISO 8859-1 version of a string descriptor
732 * @dev: the device whose string descriptor is being retrieved
733 * @index: the number of the descriptor
734 * @buf: where to put the string
735 * @size: how big is "buf"?
736 * Context: !in_interrupt ()
738 * This converts the UTF-16LE encoded strings returned by devices, from
739 * usb_get_string_descriptor(), to null-terminated ISO-8859-1 encoded ones
740 * that are more usable in most kernel contexts. Note that all characters
741 * in the chosen descriptor that can't be encoded using ISO-8859-1
742 * are converted to the question mark ("?") character, and this function
743 * chooses strings in the first language supported by the device.
745 * The ASCII (or, redundantly, "US-ASCII") character set is the seven-bit
746 * subset of ISO 8859-1. ISO-8859-1 is the eight-bit subset of Unicode,
747 * and is appropriate for use many uses of English and several other
748 * Western European languages. (But it doesn't include the "Euro" symbol.)
750 * This call is synchronous, and may not be used in an interrupt context.
752 * Returns length of the string (>= 0) or usb_control_msg status (< 0).
754 int usb_string(struct usb_device
*dev
, int index
, char *buf
, size_t size
)
760 if (dev
->state
== USB_STATE_SUSPENDED
)
761 return -EHOSTUNREACH
;
762 if (size
<= 0 || !buf
|| !index
)
765 tbuf
= kmalloc(256, GFP_KERNEL
);
769 /* get langid for strings if it's not yet known */
770 if (!dev
->have_langid
) {
771 err
= usb_string_sub(dev
, 0, 0, tbuf
);
774 "string descriptor 0 read error: %d\n",
777 } else if (err
< 4) {
778 dev_err (&dev
->dev
, "string descriptor 0 too short\n");
782 dev
->have_langid
= -1;
783 dev
->string_langid
= tbuf
[2] | (tbuf
[3]<< 8);
784 /* always use the first langid listed */
785 dev_dbg (&dev
->dev
, "default language 0x%04x\n",
790 err
= usb_string_sub(dev
, dev
->string_langid
, index
, tbuf
);
794 size
--; /* leave room for trailing NULL char in output buffer */
795 for (idx
= 0, u
= 2; u
< err
; u
+= 2) {
798 if (tbuf
[u
+1]) /* high byte */
799 buf
[idx
++] = '?'; /* non ISO-8859-1 character */
801 buf
[idx
++] = tbuf
[u
];
806 if (tbuf
[1] != USB_DT_STRING
)
807 dev_dbg(&dev
->dev
, "wrong descriptor type %02x for string %d (\"%s\")\n", tbuf
[1], index
, buf
);
815 * usb_cache_string - read a string descriptor and cache it for later use
816 * @udev: the device whose string descriptor is being read
817 * @index: the descriptor index
819 * Returns a pointer to a kmalloc'ed buffer containing the descriptor string,
820 * or NULL if the index is 0 or the string could not be read.
822 char *usb_cache_string(struct usb_device
*udev
, int index
)
825 char *smallbuf
= NULL
;
828 if (index
> 0 && (buf
= kmalloc(256, GFP_KERNEL
)) != NULL
) {
829 if ((len
= usb_string(udev
, index
, buf
, 256)) > 0) {
830 if ((smallbuf
= kmalloc(++len
, GFP_KERNEL
)) == NULL
)
832 memcpy(smallbuf
, buf
, len
);
840 * usb_get_device_descriptor - (re)reads the device descriptor (usbcore)
841 * @dev: the device whose device descriptor is being updated
842 * @size: how much of the descriptor to read
843 * Context: !in_interrupt ()
845 * Updates the copy of the device descriptor stored in the device structure,
846 * which dedicates space for this purpose. Note that several fields are
847 * converted to the host CPU's byte order: the USB version (bcdUSB), and
848 * vendors product and version fields (idVendor, idProduct, and bcdDevice).
849 * That lets device drivers compare against non-byteswapped constants.
851 * Not exported, only for use by the core. If drivers really want to read
852 * the device descriptor directly, they can call usb_get_descriptor() with
853 * type = USB_DT_DEVICE and index = 0.
855 * This call is synchronous, and may not be used in an interrupt context.
857 * Returns the number of bytes received on success, or else the status code
858 * returned by the underlying usb_control_msg() call.
860 int usb_get_device_descriptor(struct usb_device
*dev
, unsigned int size
)
862 struct usb_device_descriptor
*desc
;
865 if (size
> sizeof(*desc
))
867 desc
= kmalloc(sizeof(*desc
), GFP_NOIO
);
871 ret
= usb_get_descriptor(dev
, USB_DT_DEVICE
, 0, desc
, size
);
873 memcpy(&dev
->descriptor
, desc
, size
);
879 * usb_get_status - issues a GET_STATUS call
880 * @dev: the device whose status is being checked
881 * @type: USB_RECIP_*; for device, interface, or endpoint
882 * @target: zero (for device), else interface or endpoint number
883 * @data: pointer to two bytes of bitmap data
884 * Context: !in_interrupt ()
886 * Returns device, interface, or endpoint status. Normally only of
887 * interest to see if the device is self powered, or has enabled the
888 * remote wakeup facility; or whether a bulk or interrupt endpoint
889 * is halted ("stalled").
891 * Bits in these status bitmaps are set using the SET_FEATURE request,
892 * and cleared using the CLEAR_FEATURE request. The usb_clear_halt()
893 * function should be used to clear halt ("stall") status.
895 * This call is synchronous, and may not be used in an interrupt context.
897 * Returns the number of bytes received on success, or else the status code
898 * returned by the underlying usb_control_msg() call.
900 int usb_get_status(struct usb_device
*dev
, int type
, int target
, void *data
)
903 u16
*status
= kmalloc(sizeof(*status
), GFP_KERNEL
);
908 ret
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
909 USB_REQ_GET_STATUS
, USB_DIR_IN
| type
, 0, target
, status
,
910 sizeof(*status
), USB_CTRL_GET_TIMEOUT
);
912 *(u16
*)data
= *status
;
918 * usb_clear_halt - tells device to clear endpoint halt/stall condition
919 * @dev: device whose endpoint is halted
920 * @pipe: endpoint "pipe" being cleared
921 * Context: !in_interrupt ()
923 * This is used to clear halt conditions for bulk and interrupt endpoints,
924 * as reported by URB completion status. Endpoints that are halted are
925 * sometimes referred to as being "stalled". Such endpoints are unable
926 * to transmit or receive data until the halt status is cleared. Any URBs
927 * queued for such an endpoint should normally be unlinked by the driver
928 * before clearing the halt condition, as described in sections 5.7.5
929 * and 5.8.5 of the USB 2.0 spec.
931 * Note that control and isochronous endpoints don't halt, although control
932 * endpoints report "protocol stall" (for unsupported requests) using the
933 * same status code used to report a true stall.
935 * This call is synchronous, and may not be used in an interrupt context.
937 * Returns zero on success, or else the status code returned by the
938 * underlying usb_control_msg() call.
940 int usb_clear_halt(struct usb_device
*dev
, int pipe
)
943 int endp
= usb_pipeendpoint(pipe
);
945 if (usb_pipein (pipe
))
948 /* we don't care if it wasn't halted first. in fact some devices
949 * (like some ibmcam model 1 units) seem to expect hosts to make
950 * this request for iso endpoints, which can't halt!
952 result
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
953 USB_REQ_CLEAR_FEATURE
, USB_RECIP_ENDPOINT
,
954 USB_ENDPOINT_HALT
, endp
, NULL
, 0,
955 USB_CTRL_SET_TIMEOUT
);
957 /* don't un-halt or force to DATA0 except on success */
961 /* NOTE: seems like Microsoft and Apple don't bother verifying
962 * the clear "took", so some devices could lock up if you check...
963 * such as the Hagiwara FlashGate DUAL. So we won't bother.
965 * NOTE: make sure the logic here doesn't diverge much from
966 * the copy in usb-storage, for as long as we need two copies.
969 /* toggle was reset by the clear */
970 usb_settoggle(dev
, usb_pipeendpoint(pipe
), usb_pipeout(pipe
), 0);
976 * usb_disable_endpoint -- Disable an endpoint by address
977 * @dev: the device whose endpoint is being disabled
978 * @epaddr: the endpoint's address. Endpoint number for output,
979 * endpoint number + USB_DIR_IN for input
981 * Deallocates hcd/hardware state for this endpoint ... and nukes all
984 * If the HCD hasn't registered a disable() function, this sets the
985 * endpoint's maxpacket size to 0 to prevent further submissions.
987 void usb_disable_endpoint(struct usb_device
*dev
, unsigned int epaddr
)
989 unsigned int epnum
= epaddr
& USB_ENDPOINT_NUMBER_MASK
;
990 struct usb_host_endpoint
*ep
;
995 if (usb_endpoint_out(epaddr
)) {
996 ep
= dev
->ep_out
[epnum
];
997 dev
->ep_out
[epnum
] = NULL
;
999 ep
= dev
->ep_in
[epnum
];
1000 dev
->ep_in
[epnum
] = NULL
;
1002 if (ep
&& dev
->bus
&& dev
->bus
->op
&& dev
->bus
->op
->disable
)
1003 dev
->bus
->op
->disable(dev
, ep
);
1007 * usb_disable_interface -- Disable all endpoints for an interface
1008 * @dev: the device whose interface is being disabled
1009 * @intf: pointer to the interface descriptor
1011 * Disables all the endpoints for the interface's current altsetting.
1013 void usb_disable_interface(struct usb_device
*dev
, struct usb_interface
*intf
)
1015 struct usb_host_interface
*alt
= intf
->cur_altsetting
;
1018 for (i
= 0; i
< alt
->desc
.bNumEndpoints
; ++i
) {
1019 usb_disable_endpoint(dev
,
1020 alt
->endpoint
[i
].desc
.bEndpointAddress
);
1025 * usb_disable_device - Disable all the endpoints for a USB device
1026 * @dev: the device whose endpoints are being disabled
1027 * @skip_ep0: 0 to disable endpoint 0, 1 to skip it.
1029 * Disables all the device's endpoints, potentially including endpoint 0.
1030 * Deallocates hcd/hardware state for the endpoints (nuking all or most
1031 * pending urbs) and usbcore state for the interfaces, so that usbcore
1032 * must usb_set_configuration() before any interfaces could be used.
1034 void usb_disable_device(struct usb_device
*dev
, int skip_ep0
)
1038 dev_dbg(&dev
->dev
, "%s nuking %s URBs\n", __FUNCTION__
,
1039 skip_ep0
? "non-ep0" : "all");
1040 for (i
= skip_ep0
; i
< 16; ++i
) {
1041 usb_disable_endpoint(dev
, i
);
1042 usb_disable_endpoint(dev
, i
+ USB_DIR_IN
);
1044 dev
->toggle
[0] = dev
->toggle
[1] = 0;
1046 /* getting rid of interfaces will disconnect
1047 * any drivers bound to them (a key side effect)
1049 if (dev
->actconfig
) {
1050 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++) {
1051 struct usb_interface
*interface
;
1053 /* remove this interface if it has been registered */
1054 interface
= dev
->actconfig
->interface
[i
];
1055 if (!device_is_registered(&interface
->dev
))
1057 dev_dbg (&dev
->dev
, "unregistering interface %s\n",
1058 interface
->dev
.bus_id
);
1059 usb_remove_sysfs_intf_files(interface
);
1060 device_del (&interface
->dev
);
1063 /* Now that the interfaces are unbound, nobody should
1064 * try to access them.
1066 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++) {
1067 put_device (&dev
->actconfig
->interface
[i
]->dev
);
1068 dev
->actconfig
->interface
[i
] = NULL
;
1070 dev
->actconfig
= NULL
;
1071 if (dev
->state
== USB_STATE_CONFIGURED
)
1072 usb_set_device_state(dev
, USB_STATE_ADDRESS
);
1078 * usb_enable_endpoint - Enable an endpoint for USB communications
1079 * @dev: the device whose interface is being enabled
1082 * Resets the endpoint toggle, and sets dev->ep_{in,out} pointers.
1083 * For control endpoints, both the input and output sides are handled.
1086 usb_enable_endpoint(struct usb_device
*dev
, struct usb_host_endpoint
*ep
)
1088 unsigned int epaddr
= ep
->desc
.bEndpointAddress
;
1089 unsigned int epnum
= epaddr
& USB_ENDPOINT_NUMBER_MASK
;
1092 is_control
= ((ep
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
1093 == USB_ENDPOINT_XFER_CONTROL
);
1094 if (usb_endpoint_out(epaddr
) || is_control
) {
1095 usb_settoggle(dev
, epnum
, 1, 0);
1096 dev
->ep_out
[epnum
] = ep
;
1098 if (!usb_endpoint_out(epaddr
) || is_control
) {
1099 usb_settoggle(dev
, epnum
, 0, 0);
1100 dev
->ep_in
[epnum
] = ep
;
1105 * usb_enable_interface - Enable all the endpoints for an interface
1106 * @dev: the device whose interface is being enabled
1107 * @intf: pointer to the interface descriptor
1109 * Enables all the endpoints for the interface's current altsetting.
1111 static void usb_enable_interface(struct usb_device
*dev
,
1112 struct usb_interface
*intf
)
1114 struct usb_host_interface
*alt
= intf
->cur_altsetting
;
1117 for (i
= 0; i
< alt
->desc
.bNumEndpoints
; ++i
)
1118 usb_enable_endpoint(dev
, &alt
->endpoint
[i
]);
1122 * usb_set_interface - Makes a particular alternate setting be current
1123 * @dev: the device whose interface is being updated
1124 * @interface: the interface being updated
1125 * @alternate: the setting being chosen.
1126 * Context: !in_interrupt ()
1128 * This is used to enable data transfers on interfaces that may not
1129 * be enabled by default. Not all devices support such configurability.
1130 * Only the driver bound to an interface may change its setting.
1132 * Within any given configuration, each interface may have several
1133 * alternative settings. These are often used to control levels of
1134 * bandwidth consumption. For example, the default setting for a high
1135 * speed interrupt endpoint may not send more than 64 bytes per microframe,
1136 * while interrupt transfers of up to 3KBytes per microframe are legal.
1137 * Also, isochronous endpoints may never be part of an
1138 * interface's default setting. To access such bandwidth, alternate
1139 * interface settings must be made current.
1141 * Note that in the Linux USB subsystem, bandwidth associated with
1142 * an endpoint in a given alternate setting is not reserved until an URB
1143 * is submitted that needs that bandwidth. Some other operating systems
1144 * allocate bandwidth early, when a configuration is chosen.
1146 * This call is synchronous, and may not be used in an interrupt context.
1147 * Also, drivers must not change altsettings while urbs are scheduled for
1148 * endpoints in that interface; all such urbs must first be completed
1149 * (perhaps forced by unlinking).
1151 * Returns zero on success, or else the status code returned by the
1152 * underlying usb_control_msg() call.
1154 int usb_set_interface(struct usb_device
*dev
, int interface
, int alternate
)
1156 struct usb_interface
*iface
;
1157 struct usb_host_interface
*alt
;
1161 if (dev
->state
== USB_STATE_SUSPENDED
)
1162 return -EHOSTUNREACH
;
1164 iface
= usb_ifnum_to_if(dev
, interface
);
1166 dev_dbg(&dev
->dev
, "selecting invalid interface %d\n",
1171 alt
= usb_altnum_to_altsetting(iface
, alternate
);
1173 warn("selecting invalid altsetting %d", alternate
);
1177 ret
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
1178 USB_REQ_SET_INTERFACE
, USB_RECIP_INTERFACE
,
1179 alternate
, interface
, NULL
, 0, 5000);
1181 /* 9.4.10 says devices don't need this and are free to STALL the
1182 * request if the interface only has one alternate setting.
1184 if (ret
== -EPIPE
&& iface
->num_altsetting
== 1) {
1186 "manual set_interface for iface %d, alt %d\n",
1187 interface
, alternate
);
1192 /* FIXME drivers shouldn't need to replicate/bugfix the logic here
1193 * when they implement async or easily-killable versions of this or
1194 * other "should-be-internal" functions (like clear_halt).
1195 * should hcd+usbcore postprocess control requests?
1198 /* prevent submissions using previous endpoint settings */
1199 if (device_is_registered(&iface
->dev
))
1200 usb_remove_sysfs_intf_files(iface
);
1201 usb_disable_interface(dev
, iface
);
1203 iface
->cur_altsetting
= alt
;
1205 /* If the interface only has one altsetting and the device didn't
1206 * accept the request, we attempt to carry out the equivalent action
1207 * by manually clearing the HALT feature for each endpoint in the
1213 for (i
= 0; i
< alt
->desc
.bNumEndpoints
; i
++) {
1214 unsigned int epaddr
=
1215 alt
->endpoint
[i
].desc
.bEndpointAddress
;
1217 __create_pipe(dev
, USB_ENDPOINT_NUMBER_MASK
& epaddr
)
1218 | (usb_endpoint_out(epaddr
) ? USB_DIR_OUT
: USB_DIR_IN
);
1220 usb_clear_halt(dev
, pipe
);
1224 /* 9.1.1.5: reset toggles for all endpoints in the new altsetting
1227 * Despite EP0 is always present in all interfaces/AS, the list of
1228 * endpoints from the descriptor does not contain EP0. Due to its
1229 * omnipresence one might expect EP0 being considered "affected" by
1230 * any SetInterface request and hence assume toggles need to be reset.
1231 * However, EP0 toggles are re-synced for every individual transfer
1232 * during the SETUP stage - hence EP0 toggles are "don't care" here.
1233 * (Likewise, EP0 never "halts" on well designed devices.)
1235 usb_enable_interface(dev
, iface
);
1236 if (device_is_registered(&iface
->dev
))
1237 usb_create_sysfs_intf_files(iface
);
1243 * usb_reset_configuration - lightweight device reset
1244 * @dev: the device whose configuration is being reset
1246 * This issues a standard SET_CONFIGURATION request to the device using
1247 * the current configuration. The effect is to reset most USB-related
1248 * state in the device, including interface altsettings (reset to zero),
1249 * endpoint halts (cleared), and data toggle (only for bulk and interrupt
1250 * endpoints). Other usbcore state is unchanged, including bindings of
1251 * usb device drivers to interfaces.
1253 * Because this affects multiple interfaces, avoid using this with composite
1254 * (multi-interface) devices. Instead, the driver for each interface may
1255 * use usb_set_interface() on the interfaces it claims. Be careful though;
1256 * some devices don't support the SET_INTERFACE request, and others won't
1257 * reset all the interface state (notably data toggles). Resetting the whole
1258 * configuration would affect other drivers' interfaces.
1260 * The caller must own the device lock.
1262 * Returns zero on success, else a negative error code.
1264 int usb_reset_configuration(struct usb_device
*dev
)
1267 struct usb_host_config
*config
;
1269 if (dev
->state
== USB_STATE_SUSPENDED
)
1270 return -EHOSTUNREACH
;
1272 /* caller must have locked the device and must own
1273 * the usb bus readlock (so driver bindings are stable);
1274 * calls during probe() are fine
1277 for (i
= 1; i
< 16; ++i
) {
1278 usb_disable_endpoint(dev
, i
);
1279 usb_disable_endpoint(dev
, i
+ USB_DIR_IN
);
1282 config
= dev
->actconfig
;
1283 retval
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
1284 USB_REQ_SET_CONFIGURATION
, 0,
1285 config
->desc
.bConfigurationValue
, 0,
1286 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1290 dev
->toggle
[0] = dev
->toggle
[1] = 0;
1292 /* re-init hc/hcd interface/endpoint state */
1293 for (i
= 0; i
< config
->desc
.bNumInterfaces
; i
++) {
1294 struct usb_interface
*intf
= config
->interface
[i
];
1295 struct usb_host_interface
*alt
;
1297 if (device_is_registered(&intf
->dev
))
1298 usb_remove_sysfs_intf_files(intf
);
1299 alt
= usb_altnum_to_altsetting(intf
, 0);
1301 /* No altsetting 0? We'll assume the first altsetting.
1302 * We could use a GetInterface call, but if a device is
1303 * so non-compliant that it doesn't have altsetting 0
1304 * then I wouldn't trust its reply anyway.
1307 alt
= &intf
->altsetting
[0];
1309 intf
->cur_altsetting
= alt
;
1310 usb_enable_interface(dev
, intf
);
1311 if (device_is_registered(&intf
->dev
))
1312 usb_create_sysfs_intf_files(intf
);
1317 static void release_interface(struct device
*dev
)
1319 struct usb_interface
*intf
= to_usb_interface(dev
);
1320 struct usb_interface_cache
*intfc
=
1321 altsetting_to_usb_interface_cache(intf
->altsetting
);
1323 kref_put(&intfc
->ref
, usb_release_interface_cache
);
1328 * usb_set_configuration - Makes a particular device setting be current
1329 * @dev: the device whose configuration is being updated
1330 * @configuration: the configuration being chosen.
1331 * Context: !in_interrupt(), caller owns the device lock
1333 * This is used to enable non-default device modes. Not all devices
1334 * use this kind of configurability; many devices only have one
1337 * USB device configurations may affect Linux interoperability,
1338 * power consumption and the functionality available. For example,
1339 * the default configuration is limited to using 100mA of bus power,
1340 * so that when certain device functionality requires more power,
1341 * and the device is bus powered, that functionality should be in some
1342 * non-default device configuration. Other device modes may also be
1343 * reflected as configuration options, such as whether two ISDN
1344 * channels are available independently; and choosing between open
1345 * standard device protocols (like CDC) or proprietary ones.
1347 * Note that USB has an additional level of device configurability,
1348 * associated with interfaces. That configurability is accessed using
1349 * usb_set_interface().
1351 * This call is synchronous. The calling context must be able to sleep,
1352 * must own the device lock, and must not hold the driver model's USB
1353 * bus rwsem; usb device driver probe() methods cannot use this routine.
1355 * Returns zero on success, or else the status code returned by the
1356 * underlying call that failed. On successful completion, each interface
1357 * in the original device configuration has been destroyed, and each one
1358 * in the new configuration has been probed by all relevant usb device
1359 * drivers currently known to the kernel.
1361 int usb_set_configuration(struct usb_device
*dev
, int configuration
)
1364 struct usb_host_config
*cp
= NULL
;
1365 struct usb_interface
**new_interfaces
= NULL
;
1368 for (i
= 0; i
< dev
->descriptor
.bNumConfigurations
; i
++) {
1369 if (dev
->config
[i
].desc
.bConfigurationValue
== configuration
) {
1370 cp
= &dev
->config
[i
];
1374 if ((!cp
&& configuration
!= 0))
1377 /* The USB spec says configuration 0 means unconfigured.
1378 * But if a device includes a configuration numbered 0,
1379 * we will accept it as a correctly configured state.
1381 if (cp
&& configuration
== 0)
1382 dev_warn(&dev
->dev
, "config 0 descriptor??\n");
1384 if (dev
->state
== USB_STATE_SUSPENDED
)
1385 return -EHOSTUNREACH
;
1387 /* Allocate memory for new interfaces before doing anything else,
1388 * so that if we run out then nothing will have changed. */
1391 nintf
= cp
->desc
.bNumInterfaces
;
1392 new_interfaces
= kmalloc(nintf
* sizeof(*new_interfaces
),
1394 if (!new_interfaces
) {
1395 dev_err(&dev
->dev
, "Out of memory");
1399 for (; n
< nintf
; ++n
) {
1400 new_interfaces
[n
] = kzalloc(
1401 sizeof(struct usb_interface
),
1403 if (!new_interfaces
[n
]) {
1404 dev_err(&dev
->dev
, "Out of memory");
1408 kfree(new_interfaces
[n
]);
1409 kfree(new_interfaces
);
1414 i
= dev
->bus_mA
- cp
->desc
.bMaxPower
* 2;
1416 dev_warn(&dev
->dev
, "new config #%d exceeds power "
1421 /* if it's already configured, clear out old state first.
1422 * getting rid of old interfaces means unbinding their drivers.
1424 if (dev
->state
!= USB_STATE_ADDRESS
)
1425 usb_disable_device (dev
, 1); // Skip ep0
1427 if ((ret
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
1428 USB_REQ_SET_CONFIGURATION
, 0, configuration
, 0,
1429 NULL
, 0, USB_CTRL_SET_TIMEOUT
)) < 0) {
1431 /* All the old state is gone, so what else can we do?
1432 * The device is probably useless now anyway.
1437 dev
->actconfig
= cp
;
1439 usb_set_device_state(dev
, USB_STATE_ADDRESS
);
1440 goto free_interfaces
;
1442 usb_set_device_state(dev
, USB_STATE_CONFIGURED
);
1444 /* Initialize the new interface structures and the
1445 * hc/hcd/usbcore interface/endpoint state.
1447 for (i
= 0; i
< nintf
; ++i
) {
1448 struct usb_interface_cache
*intfc
;
1449 struct usb_interface
*intf
;
1450 struct usb_host_interface
*alt
;
1452 cp
->interface
[i
] = intf
= new_interfaces
[i
];
1453 intfc
= cp
->intf_cache
[i
];
1454 intf
->altsetting
= intfc
->altsetting
;
1455 intf
->num_altsetting
= intfc
->num_altsetting
;
1456 kref_get(&intfc
->ref
);
1458 alt
= usb_altnum_to_altsetting(intf
, 0);
1460 /* No altsetting 0? We'll assume the first altsetting.
1461 * We could use a GetInterface call, but if a device is
1462 * so non-compliant that it doesn't have altsetting 0
1463 * then I wouldn't trust its reply anyway.
1466 alt
= &intf
->altsetting
[0];
1468 intf
->cur_altsetting
= alt
;
1469 usb_enable_interface(dev
, intf
);
1470 intf
->dev
.parent
= &dev
->dev
;
1471 intf
->dev
.driver
= NULL
;
1472 intf
->dev
.bus
= &usb_bus_type
;
1473 intf
->dev
.dma_mask
= dev
->dev
.dma_mask
;
1474 intf
->dev
.release
= release_interface
;
1475 device_initialize (&intf
->dev
);
1476 mark_quiesced(intf
);
1477 sprintf (&intf
->dev
.bus_id
[0], "%d-%s:%d.%d",
1478 dev
->bus
->busnum
, dev
->devpath
,
1479 configuration
, alt
->desc
.bInterfaceNumber
);
1481 kfree(new_interfaces
);
1483 if (cp
->string
== NULL
)
1484 cp
->string
= usb_cache_string(dev
, cp
->desc
.iConfiguration
);
1486 /* Now that all the interfaces are set up, register them
1487 * to trigger binding of drivers to interfaces. probe()
1488 * routines may install different altsettings and may
1489 * claim() any interfaces not yet bound. Many class drivers
1490 * need that: CDC, audio, video, etc.
1492 for (i
= 0; i
< nintf
; ++i
) {
1493 struct usb_interface
*intf
= cp
->interface
[i
];
1496 "adding %s (config #%d, interface %d)\n",
1497 intf
->dev
.bus_id
, configuration
,
1498 intf
->cur_altsetting
->desc
.bInterfaceNumber
);
1499 ret
= device_add (&intf
->dev
);
1501 dev_err(&dev
->dev
, "device_add(%s) --> %d\n",
1502 intf
->dev
.bus_id
, ret
);
1505 usb_create_sysfs_intf_files (intf
);
1511 // synchronous request completion model
1512 EXPORT_SYMBOL(usb_control_msg
);
1513 EXPORT_SYMBOL(usb_bulk_msg
);
1515 EXPORT_SYMBOL(usb_sg_init
);
1516 EXPORT_SYMBOL(usb_sg_cancel
);
1517 EXPORT_SYMBOL(usb_sg_wait
);
1519 // synchronous control message convenience routines
1520 EXPORT_SYMBOL(usb_get_descriptor
);
1521 EXPORT_SYMBOL(usb_get_status
);
1522 EXPORT_SYMBOL(usb_string
);
1524 // synchronous calls that also maintain usbcore state
1525 EXPORT_SYMBOL(usb_clear_halt
);
1526 EXPORT_SYMBOL(usb_reset_configuration
);
1527 EXPORT_SYMBOL(usb_set_interface
);