2 * message.c - synchronous message handling
5 #include <linux/config.h>
6 #include <linux/pci.h> /* for scatterlist macros */
8 #include <linux/module.h>
9 #include <linux/slab.h>
10 #include <linux/init.h>
12 #include <linux/timer.h>
13 #include <linux/ctype.h>
14 #include <linux/device.h>
15 #include <asm/byteorder.h>
16 #include <asm/scatterlist.h>
18 #include "hcd.h" /* for usbcore internals */
21 static void usb_api_blocking_completion(struct urb
*urb
, struct pt_regs
*regs
)
23 complete((struct completion
*)urb
->context
);
27 static void timeout_kill(unsigned long data
)
29 struct urb
*urb
= (struct urb
*) data
;
34 // Starts urb and waits for completion or timeout
35 // note that this call is NOT interruptible, while
36 // many device driver i/o requests should be interruptible
37 static int usb_start_wait_urb(struct urb
*urb
, int timeout
, int* actual_length
)
39 struct completion done
;
40 struct timer_list timer
;
43 init_completion(&done
);
45 urb
->actual_length
= 0;
46 status
= usb_submit_urb(urb
, GFP_NOIO
);
51 timer
.expires
= jiffies
+ msecs_to_jiffies(timeout
);
52 timer
.data
= (unsigned long)urb
;
53 timer
.function
= timeout_kill
;
54 /* grr. timeout _should_ include submit delays. */
57 wait_for_completion(&done
);
59 /* note: HCDs return ETIMEDOUT for other reasons too */
60 if (status
== -ECONNRESET
) {
61 dev_dbg(&urb
->dev
->dev
,
62 "%s timed out on ep%d%s len=%d/%d\n",
64 usb_pipeendpoint(urb
->pipe
),
65 usb_pipein(urb
->pipe
) ? "in" : "out",
67 urb
->transfer_buffer_length
69 if (urb
->actual_length
> 0)
75 del_timer_sync(&timer
);
79 *actual_length
= urb
->actual_length
;
84 /*-------------------------------------------------------------------*/
85 // returns status (negative) or length (positive)
86 static int usb_internal_control_msg(struct usb_device
*usb_dev
,
88 struct usb_ctrlrequest
*cmd
,
89 void *data
, int len
, int timeout
)
95 urb
= usb_alloc_urb(0, GFP_NOIO
);
99 usb_fill_control_urb(urb
, usb_dev
, pipe
, (unsigned char *)cmd
, data
,
100 len
, usb_api_blocking_completion
, NULL
);
102 retv
= usb_start_wait_urb(urb
, timeout
, &length
);
110 * usb_control_msg - Builds a control urb, sends it off and waits for completion
111 * @dev: pointer to the usb device to send the message to
112 * @pipe: endpoint "pipe" to send the message to
113 * @request: USB message request value
114 * @requesttype: USB message request type value
115 * @value: USB message value
116 * @index: USB message index value
117 * @data: pointer to the data to send
118 * @size: length in bytes of the data to send
119 * @timeout: time in msecs to wait for the message to complete before
120 * timing out (if 0 the wait is forever)
121 * Context: !in_interrupt ()
123 * This function sends a simple control message to a specified endpoint
124 * and waits for the message to complete, or timeout.
126 * If successful, it returns the number of bytes transferred, otherwise a negative error number.
128 * Don't use this function from within an interrupt context, like a
129 * bottom half handler. If you need an asynchronous message, or need to send
130 * a message from within interrupt context, use usb_submit_urb()
131 * If a thread in your driver uses this call, make sure your disconnect()
132 * method can wait for it to complete. Since you don't have a handle on
133 * the URB used, you can't cancel the request.
135 int usb_control_msg(struct usb_device
*dev
, unsigned int pipe
, __u8 request
, __u8 requesttype
,
136 __u16 value
, __u16 index
, void *data
, __u16 size
, int timeout
)
138 struct usb_ctrlrequest
*dr
= kmalloc(sizeof(struct usb_ctrlrequest
), GFP_NOIO
);
144 dr
->bRequestType
= requesttype
;
145 dr
->bRequest
= request
;
146 dr
->wValue
= cpu_to_le16p(&value
);
147 dr
->wIndex
= cpu_to_le16p(&index
);
148 dr
->wLength
= cpu_to_le16p(&size
);
150 //dbg("usb_control_msg");
152 ret
= usb_internal_control_msg(dev
, pipe
, dr
, data
, size
, timeout
);
161 * usb_interrupt_msg - Builds an interrupt urb, sends it off and waits for completion
162 * @usb_dev: pointer to the usb device to send the message to
163 * @pipe: endpoint "pipe" to send the message to
164 * @data: pointer to the data to send
165 * @len: length in bytes of the data to send
166 * @actual_length: pointer to a location to put the actual length transferred in bytes
167 * @timeout: time in msecs to wait for the message to complete before
168 * timing out (if 0 the wait is forever)
169 * Context: !in_interrupt ()
171 * This function sends a simple interrupt message to a specified endpoint and
172 * waits for the message to complete, or timeout.
174 * If successful, it returns 0, otherwise a negative error number. The number
175 * of actual bytes transferred will be stored in the actual_length paramater.
177 * Don't use this function from within an interrupt context, like a bottom half
178 * handler. If you need an asynchronous message, or need to send a message
179 * from within interrupt context, use usb_submit_urb() If a thread in your
180 * driver uses this call, make sure your disconnect() method can wait for it to
181 * complete. Since you don't have a handle on the URB used, you can't cancel
184 int usb_interrupt_msg(struct usb_device
*usb_dev
, unsigned int pipe
,
185 void *data
, int len
, int *actual_length
, int timeout
)
187 return usb_bulk_msg(usb_dev
, pipe
, data
, len
, actual_length
, timeout
);
189 EXPORT_SYMBOL_GPL(usb_interrupt_msg
);
192 * usb_bulk_msg - Builds a bulk urb, sends it off and waits for completion
193 * @usb_dev: pointer to the usb device to send the message to
194 * @pipe: endpoint "pipe" to send the message to
195 * @data: pointer to the data to send
196 * @len: length in bytes of the data to send
197 * @actual_length: pointer to a location to put the actual length transferred in bytes
198 * @timeout: time in msecs to wait for the message to complete before
199 * timing out (if 0 the wait is forever)
200 * Context: !in_interrupt ()
202 * This function sends a simple bulk message to a specified endpoint
203 * and waits for the message to complete, or timeout.
205 * If successful, it returns 0, otherwise a negative error number.
206 * The number of actual bytes transferred will be stored in the
207 * actual_length paramater.
209 * Don't use this function from within an interrupt context, like a
210 * bottom half handler. If you need an asynchronous message, or need to
211 * send a message from within interrupt context, use usb_submit_urb()
212 * If a thread in your driver uses this call, make sure your disconnect()
213 * method can wait for it to complete. Since you don't have a handle on
214 * the URB used, you can't cancel the request.
216 * Because there is no usb_interrupt_msg() and no USBDEVFS_INTERRUPT
217 * ioctl, users are forced to abuse this routine by using it to submit
218 * URBs for interrupt endpoints. We will take the liberty of creating
219 * an interrupt URB (with the default interval) if the target is an
220 * interrupt endpoint.
222 int usb_bulk_msg(struct usb_device
*usb_dev
, unsigned int pipe
,
223 void *data
, int len
, int *actual_length
, int timeout
)
226 struct usb_host_endpoint
*ep
;
228 ep
= (usb_pipein(pipe
) ? usb_dev
->ep_in
: usb_dev
->ep_out
)
229 [usb_pipeendpoint(pipe
)];
233 urb
= usb_alloc_urb(0, GFP_KERNEL
);
237 if ((ep
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) ==
238 USB_ENDPOINT_XFER_INT
) {
239 pipe
= (pipe
& ~(3 << 30)) | (PIPE_INTERRUPT
<< 30);
240 usb_fill_int_urb(urb
, usb_dev
, pipe
, data
, len
,
241 usb_api_blocking_completion
, NULL
,
244 usb_fill_bulk_urb(urb
, usb_dev
, pipe
, data
, len
,
245 usb_api_blocking_completion
, NULL
);
247 return usb_start_wait_urb(urb
, timeout
, actual_length
);
250 /*-------------------------------------------------------------------*/
252 static void sg_clean (struct usb_sg_request
*io
)
255 while (io
->entries
--)
256 usb_free_urb (io
->urbs
[io
->entries
]);
260 if (io
->dev
->dev
.dma_mask
!= NULL
)
261 usb_buffer_unmap_sg (io
->dev
, io
->pipe
, io
->sg
, io
->nents
);
265 static void sg_complete (struct urb
*urb
, struct pt_regs
*regs
)
267 struct usb_sg_request
*io
= (struct usb_sg_request
*) urb
->context
;
269 spin_lock (&io
->lock
);
271 /* In 2.5 we require hcds' endpoint queues not to progress after fault
272 * reports, until the completion callback (this!) returns. That lets
273 * device driver code (like this routine) unlink queued urbs first,
274 * if it needs to, since the HC won't work on them at all. So it's
275 * not possible for page N+1 to overwrite page N, and so on.
277 * That's only for "hard" faults; "soft" faults (unlinks) sometimes
278 * complete before the HCD can get requests away from hardware,
279 * though never during cleanup after a hard fault.
282 && (io
->status
!= -ECONNRESET
283 || urb
->status
!= -ECONNRESET
)
284 && urb
->actual_length
) {
285 dev_err (io
->dev
->bus
->controller
,
286 "dev %s ep%d%s scatterlist error %d/%d\n",
288 usb_pipeendpoint (urb
->pipe
),
289 usb_pipein (urb
->pipe
) ? "in" : "out",
290 urb
->status
, io
->status
);
294 if (io
->status
== 0 && urb
->status
&& urb
->status
!= -ECONNRESET
) {
295 int i
, found
, status
;
297 io
->status
= urb
->status
;
299 /* the previous urbs, and this one, completed already.
300 * unlink pending urbs so they won't rx/tx bad data.
301 * careful: unlink can sometimes be synchronous...
303 spin_unlock (&io
->lock
);
304 for (i
= 0, found
= 0; i
< io
->entries
; i
++) {
305 if (!io
->urbs
[i
] || !io
->urbs
[i
]->dev
)
308 status
= usb_unlink_urb (io
->urbs
[i
]);
309 if (status
!= -EINPROGRESS
312 dev_err (&io
->dev
->dev
,
313 "%s, unlink --> %d\n",
314 __FUNCTION__
, status
);
315 } else if (urb
== io
->urbs
[i
])
318 spin_lock (&io
->lock
);
322 /* on the last completion, signal usb_sg_wait() */
323 io
->bytes
+= urb
->actual_length
;
326 complete (&io
->complete
);
328 spin_unlock (&io
->lock
);
333 * usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request
334 * @io: request block being initialized. until usb_sg_wait() returns,
335 * treat this as a pointer to an opaque block of memory,
336 * @dev: the usb device that will send or receive the data
337 * @pipe: endpoint "pipe" used to transfer the data
338 * @period: polling rate for interrupt endpoints, in frames or
339 * (for high speed endpoints) microframes; ignored for bulk
340 * @sg: scatterlist entries
341 * @nents: how many entries in the scatterlist
342 * @length: how many bytes to send from the scatterlist, or zero to
343 * send every byte identified in the list.
344 * @mem_flags: SLAB_* flags affecting memory allocations in this call
346 * Returns zero for success, else a negative errno value. This initializes a
347 * scatter/gather request, allocating resources such as I/O mappings and urb
348 * memory (except maybe memory used by USB controller drivers).
350 * The request must be issued using usb_sg_wait(), which waits for the I/O to
351 * complete (or to be canceled) and then cleans up all resources allocated by
354 * The request may be canceled with usb_sg_cancel(), either before or after
355 * usb_sg_wait() is called.
358 struct usb_sg_request
*io
,
359 struct usb_device
*dev
,
362 struct scatterlist
*sg
,
372 if (!io
|| !dev
|| !sg
373 || usb_pipecontrol (pipe
)
374 || usb_pipeisoc (pipe
)
378 spin_lock_init (&io
->lock
);
384 /* not all host controllers use DMA (like the mainstream pci ones);
385 * they can use PIO (sl811) or be software over another transport.
387 dma
= (dev
->dev
.dma_mask
!= NULL
);
389 io
->entries
= usb_buffer_map_sg (dev
, pipe
, sg
, nents
);
393 /* initialize all the urbs we'll use */
394 if (io
->entries
<= 0)
397 io
->count
= io
->entries
;
398 io
->urbs
= kmalloc (io
->entries
* sizeof *io
->urbs
, mem_flags
);
402 urb_flags
= URB_NO_TRANSFER_DMA_MAP
| URB_NO_INTERRUPT
;
403 if (usb_pipein (pipe
))
404 urb_flags
|= URB_SHORT_NOT_OK
;
406 for (i
= 0; i
< io
->entries
; i
++) {
409 io
->urbs
[i
] = usb_alloc_urb (0, mem_flags
);
415 io
->urbs
[i
]->dev
= NULL
;
416 io
->urbs
[i
]->pipe
= pipe
;
417 io
->urbs
[i
]->interval
= period
;
418 io
->urbs
[i
]->transfer_flags
= urb_flags
;
420 io
->urbs
[i
]->complete
= sg_complete
;
421 io
->urbs
[i
]->context
= io
;
422 io
->urbs
[i
]->status
= -EINPROGRESS
;
423 io
->urbs
[i
]->actual_length
= 0;
426 /* hc may use _only_ transfer_dma */
427 io
->urbs
[i
]->transfer_dma
= sg_dma_address (sg
+ i
);
428 len
= sg_dma_len (sg
+ i
);
430 /* hc may use _only_ transfer_buffer */
431 io
->urbs
[i
]->transfer_buffer
=
432 page_address (sg
[i
].page
) + sg
[i
].offset
;
437 len
= min_t (unsigned, len
, length
);
442 io
->urbs
[i
]->transfer_buffer_length
= len
;
444 io
->urbs
[--i
]->transfer_flags
&= ~URB_NO_INTERRUPT
;
446 /* transaction state */
449 init_completion (&io
->complete
);
459 * usb_sg_wait - synchronously execute scatter/gather request
460 * @io: request block handle, as initialized with usb_sg_init().
461 * some fields become accessible when this call returns.
462 * Context: !in_interrupt ()
464 * This function blocks until the specified I/O operation completes. It
465 * leverages the grouping of the related I/O requests to get good transfer
466 * rates, by queueing the requests. At higher speeds, such queuing can
467 * significantly improve USB throughput.
469 * There are three kinds of completion for this function.
470 * (1) success, where io->status is zero. The number of io->bytes
471 * transferred is as requested.
472 * (2) error, where io->status is a negative errno value. The number
473 * of io->bytes transferred before the error is usually less
474 * than requested, and can be nonzero.
475 * (3) cancellation, a type of error with status -ECONNRESET that
476 * is initiated by usb_sg_cancel().
478 * When this function returns, all memory allocated through usb_sg_init() or
479 * this call will have been freed. The request block parameter may still be
480 * passed to usb_sg_cancel(), or it may be freed. It could also be
481 * reinitialized and then reused.
483 * Data Transfer Rates:
485 * Bulk transfers are valid for full or high speed endpoints.
486 * The best full speed data rate is 19 packets of 64 bytes each
487 * per frame, or 1216 bytes per millisecond.
488 * The best high speed data rate is 13 packets of 512 bytes each
489 * per microframe, or 52 KBytes per millisecond.
491 * The reason to use interrupt transfers through this API would most likely
492 * be to reserve high speed bandwidth, where up to 24 KBytes per millisecond
493 * could be transferred. That capability is less useful for low or full
494 * speed interrupt endpoints, which allow at most one packet per millisecond,
495 * of at most 8 or 64 bytes (respectively).
497 void usb_sg_wait (struct usb_sg_request
*io
)
499 int i
, entries
= io
->entries
;
501 /* queue the urbs. */
502 spin_lock_irq (&io
->lock
);
503 for (i
= 0; i
< entries
&& !io
->status
; i
++) {
506 io
->urbs
[i
]->dev
= io
->dev
;
507 retval
= usb_submit_urb (io
->urbs
[i
], SLAB_ATOMIC
);
509 /* after we submit, let completions or cancelations fire;
510 * we handshake using io->status.
512 spin_unlock_irq (&io
->lock
);
514 /* maybe we retrying will recover */
515 case -ENXIO
: // hc didn't queue this one
518 io
->urbs
[i
]->dev
= NULL
;
524 /* no error? continue immediately.
526 * NOTE: to work better with UHCI (4K I/O buffer may
527 * need 3K of TDs) it may be good to limit how many
528 * URBs are queued at once; N milliseconds?
534 /* fail any uncompleted urbs */
536 io
->urbs
[i
]->dev
= NULL
;
537 io
->urbs
[i
]->status
= retval
;
538 dev_dbg (&io
->dev
->dev
, "%s, submit --> %d\n",
539 __FUNCTION__
, retval
);
542 spin_lock_irq (&io
->lock
);
543 if (retval
&& (io
->status
== 0 || io
->status
== -ECONNRESET
))
546 io
->count
-= entries
- i
;
548 complete (&io
->complete
);
549 spin_unlock_irq (&io
->lock
);
551 /* OK, yes, this could be packaged as non-blocking.
552 * So could the submit loop above ... but it's easier to
553 * solve neither problem than to solve both!
555 wait_for_completion (&io
->complete
);
561 * usb_sg_cancel - stop scatter/gather i/o issued by usb_sg_wait()
562 * @io: request block, initialized with usb_sg_init()
564 * This stops a request after it has been started by usb_sg_wait().
565 * It can also prevents one initialized by usb_sg_init() from starting,
566 * so that call just frees resources allocated to the request.
568 void usb_sg_cancel (struct usb_sg_request
*io
)
572 spin_lock_irqsave (&io
->lock
, flags
);
574 /* shut everything down, if it didn't already */
578 io
->status
= -ECONNRESET
;
579 spin_unlock (&io
->lock
);
580 for (i
= 0; i
< io
->entries
; i
++) {
583 if (!io
->urbs
[i
]->dev
)
585 retval
= usb_unlink_urb (io
->urbs
[i
]);
586 if (retval
!= -EINPROGRESS
&& retval
!= -EBUSY
)
587 dev_warn (&io
->dev
->dev
, "%s, unlink --> %d\n",
588 __FUNCTION__
, retval
);
590 spin_lock (&io
->lock
);
592 spin_unlock_irqrestore (&io
->lock
, flags
);
595 /*-------------------------------------------------------------------*/
598 * usb_get_descriptor - issues a generic GET_DESCRIPTOR request
599 * @dev: the device whose descriptor is being retrieved
600 * @type: the descriptor type (USB_DT_*)
601 * @index: the number of the descriptor
602 * @buf: where to put the descriptor
603 * @size: how big is "buf"?
604 * Context: !in_interrupt ()
606 * Gets a USB descriptor. Convenience functions exist to simplify
607 * getting some types of descriptors. Use
608 * usb_get_string() or usb_string() for USB_DT_STRING.
609 * Device (USB_DT_DEVICE) and configuration descriptors (USB_DT_CONFIG)
610 * are part of the device structure.
611 * In addition to a number of USB-standard descriptors, some
612 * devices also use class-specific or vendor-specific descriptors.
614 * This call is synchronous, and may not be used in an interrupt context.
616 * Returns the number of bytes received on success, or else the status code
617 * returned by the underlying usb_control_msg() call.
619 int usb_get_descriptor(struct usb_device
*dev
, unsigned char type
, unsigned char index
, void *buf
, int size
)
624 memset(buf
,0,size
); // Make sure we parse really received data
626 for (i
= 0; i
< 3; ++i
) {
627 /* retry on length 0 or stall; some devices are flakey */
628 result
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
629 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
630 (type
<< 8) + index
, 0, buf
, size
,
631 USB_CTRL_GET_TIMEOUT
);
632 if (result
== 0 || result
== -EPIPE
)
634 if (result
> 1 && ((u8
*)buf
)[1] != type
) {
644 * usb_get_string - gets a string descriptor
645 * @dev: the device whose string descriptor is being retrieved
646 * @langid: code for language chosen (from string descriptor zero)
647 * @index: the number of the descriptor
648 * @buf: where to put the string
649 * @size: how big is "buf"?
650 * Context: !in_interrupt ()
652 * Retrieves a string, encoded using UTF-16LE (Unicode, 16 bits per character,
653 * in little-endian byte order).
654 * The usb_string() function will often be a convenient way to turn
655 * these strings into kernel-printable form.
657 * Strings may be referenced in device, configuration, interface, or other
658 * descriptors, and could also be used in vendor-specific ways.
660 * This call is synchronous, and may not be used in an interrupt context.
662 * Returns the number of bytes received on success, or else the status code
663 * returned by the underlying usb_control_msg() call.
665 static int usb_get_string(struct usb_device
*dev
, unsigned short langid
,
666 unsigned char index
, void *buf
, int size
)
671 for (i
= 0; i
< 3; ++i
) {
672 /* retry on length 0 or stall; some devices are flakey */
673 result
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
674 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
675 (USB_DT_STRING
<< 8) + index
, langid
, buf
, size
,
676 USB_CTRL_GET_TIMEOUT
);
677 if (!(result
== 0 || result
== -EPIPE
))
683 static void usb_try_string_workarounds(unsigned char *buf
, int *length
)
685 int newlength
, oldlength
= *length
;
687 for (newlength
= 2; newlength
+ 1 < oldlength
; newlength
+= 2)
688 if (!isprint(buf
[newlength
]) || buf
[newlength
+ 1])
697 static int usb_string_sub(struct usb_device
*dev
, unsigned int langid
,
698 unsigned int index
, unsigned char *buf
)
702 /* Try to read the string descriptor by asking for the maximum
703 * possible number of bytes */
704 rc
= usb_get_string(dev
, langid
, index
, buf
, 255);
706 /* If that failed try to read the descriptor length, then
707 * ask for just that many bytes */
709 rc
= usb_get_string(dev
, langid
, index
, buf
, 2);
711 rc
= usb_get_string(dev
, langid
, index
, buf
, buf
[0]);
715 if (!buf
[0] && !buf
[1])
716 usb_try_string_workarounds(buf
, &rc
);
718 /* There might be extra junk at the end of the descriptor */
722 rc
= rc
- (rc
& 1); /* force a multiple of two */
726 rc
= (rc
< 0 ? rc
: -EINVAL
);
732 * usb_string - returns ISO 8859-1 version of a string descriptor
733 * @dev: the device whose string descriptor is being retrieved
734 * @index: the number of the descriptor
735 * @buf: where to put the string
736 * @size: how big is "buf"?
737 * Context: !in_interrupt ()
739 * This converts the UTF-16LE encoded strings returned by devices, from
740 * usb_get_string_descriptor(), to null-terminated ISO-8859-1 encoded ones
741 * that are more usable in most kernel contexts. Note that all characters
742 * in the chosen descriptor that can't be encoded using ISO-8859-1
743 * are converted to the question mark ("?") character, and this function
744 * chooses strings in the first language supported by the device.
746 * The ASCII (or, redundantly, "US-ASCII") character set is the seven-bit
747 * subset of ISO 8859-1. ISO-8859-1 is the eight-bit subset of Unicode,
748 * and is appropriate for use many uses of English and several other
749 * Western European languages. (But it doesn't include the "Euro" symbol.)
751 * This call is synchronous, and may not be used in an interrupt context.
753 * Returns length of the string (>= 0) or usb_control_msg status (< 0).
755 int usb_string(struct usb_device
*dev
, int index
, char *buf
, size_t size
)
761 if (dev
->state
== USB_STATE_SUSPENDED
)
762 return -EHOSTUNREACH
;
763 if (size
<= 0 || !buf
|| !index
)
766 tbuf
= kmalloc(256, GFP_KERNEL
);
770 /* get langid for strings if it's not yet known */
771 if (!dev
->have_langid
) {
772 err
= usb_string_sub(dev
, 0, 0, tbuf
);
775 "string descriptor 0 read error: %d\n",
778 } else if (err
< 4) {
779 dev_err (&dev
->dev
, "string descriptor 0 too short\n");
783 dev
->have_langid
= -1;
784 dev
->string_langid
= tbuf
[2] | (tbuf
[3]<< 8);
785 /* always use the first langid listed */
786 dev_dbg (&dev
->dev
, "default language 0x%04x\n",
791 err
= usb_string_sub(dev
, dev
->string_langid
, index
, tbuf
);
795 size
--; /* leave room for trailing NULL char in output buffer */
796 for (idx
= 0, u
= 2; u
< err
; u
+= 2) {
799 if (tbuf
[u
+1]) /* high byte */
800 buf
[idx
++] = '?'; /* non ISO-8859-1 character */
802 buf
[idx
++] = tbuf
[u
];
807 if (tbuf
[1] != USB_DT_STRING
)
808 dev_dbg(&dev
->dev
, "wrong descriptor type %02x for string %d (\"%s\")\n", tbuf
[1], index
, buf
);
816 * usb_cache_string - read a string descriptor and cache it for later use
817 * @udev: the device whose string descriptor is being read
818 * @index: the descriptor index
820 * Returns a pointer to a kmalloc'ed buffer containing the descriptor string,
821 * or NULL if the index is 0 or the string could not be read.
823 char *usb_cache_string(struct usb_device
*udev
, int index
)
826 char *smallbuf
= NULL
;
829 if (index
> 0 && (buf
= kmalloc(256, GFP_KERNEL
)) != NULL
) {
830 if ((len
= usb_string(udev
, index
, buf
, 256)) > 0) {
831 if ((smallbuf
= kmalloc(++len
, GFP_KERNEL
)) == NULL
)
833 memcpy(smallbuf
, buf
, len
);
841 * usb_get_device_descriptor - (re)reads the device descriptor (usbcore)
842 * @dev: the device whose device descriptor is being updated
843 * @size: how much of the descriptor to read
844 * Context: !in_interrupt ()
846 * Updates the copy of the device descriptor stored in the device structure,
847 * which dedicates space for this purpose. Note that several fields are
848 * converted to the host CPU's byte order: the USB version (bcdUSB), and
849 * vendors product and version fields (idVendor, idProduct, and bcdDevice).
850 * That lets device drivers compare against non-byteswapped constants.
852 * Not exported, only for use by the core. If drivers really want to read
853 * the device descriptor directly, they can call usb_get_descriptor() with
854 * type = USB_DT_DEVICE and index = 0.
856 * This call is synchronous, and may not be used in an interrupt context.
858 * Returns the number of bytes received on success, or else the status code
859 * returned by the underlying usb_control_msg() call.
861 int usb_get_device_descriptor(struct usb_device
*dev
, unsigned int size
)
863 struct usb_device_descriptor
*desc
;
866 if (size
> sizeof(*desc
))
868 desc
= kmalloc(sizeof(*desc
), GFP_NOIO
);
872 ret
= usb_get_descriptor(dev
, USB_DT_DEVICE
, 0, desc
, size
);
874 memcpy(&dev
->descriptor
, desc
, size
);
880 * usb_get_status - issues a GET_STATUS call
881 * @dev: the device whose status is being checked
882 * @type: USB_RECIP_*; for device, interface, or endpoint
883 * @target: zero (for device), else interface or endpoint number
884 * @data: pointer to two bytes of bitmap data
885 * Context: !in_interrupt ()
887 * Returns device, interface, or endpoint status. Normally only of
888 * interest to see if the device is self powered, or has enabled the
889 * remote wakeup facility; or whether a bulk or interrupt endpoint
890 * is halted ("stalled").
892 * Bits in these status bitmaps are set using the SET_FEATURE request,
893 * and cleared using the CLEAR_FEATURE request. The usb_clear_halt()
894 * function should be used to clear halt ("stall") status.
896 * This call is synchronous, and may not be used in an interrupt context.
898 * Returns the number of bytes received on success, or else the status code
899 * returned by the underlying usb_control_msg() call.
901 int usb_get_status(struct usb_device
*dev
, int type
, int target
, void *data
)
904 u16
*status
= kmalloc(sizeof(*status
), GFP_KERNEL
);
909 ret
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
910 USB_REQ_GET_STATUS
, USB_DIR_IN
| type
, 0, target
, status
,
911 sizeof(*status
), USB_CTRL_GET_TIMEOUT
);
913 *(u16
*)data
= *status
;
919 * usb_clear_halt - tells device to clear endpoint halt/stall condition
920 * @dev: device whose endpoint is halted
921 * @pipe: endpoint "pipe" being cleared
922 * Context: !in_interrupt ()
924 * This is used to clear halt conditions for bulk and interrupt endpoints,
925 * as reported by URB completion status. Endpoints that are halted are
926 * sometimes referred to as being "stalled". Such endpoints are unable
927 * to transmit or receive data until the halt status is cleared. Any URBs
928 * queued for such an endpoint should normally be unlinked by the driver
929 * before clearing the halt condition, as described in sections 5.7.5
930 * and 5.8.5 of the USB 2.0 spec.
932 * Note that control and isochronous endpoints don't halt, although control
933 * endpoints report "protocol stall" (for unsupported requests) using the
934 * same status code used to report a true stall.
936 * This call is synchronous, and may not be used in an interrupt context.
938 * Returns zero on success, or else the status code returned by the
939 * underlying usb_control_msg() call.
941 int usb_clear_halt(struct usb_device
*dev
, int pipe
)
944 int endp
= usb_pipeendpoint(pipe
);
946 if (usb_pipein (pipe
))
949 /* we don't care if it wasn't halted first. in fact some devices
950 * (like some ibmcam model 1 units) seem to expect hosts to make
951 * this request for iso endpoints, which can't halt!
953 result
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
954 USB_REQ_CLEAR_FEATURE
, USB_RECIP_ENDPOINT
,
955 USB_ENDPOINT_HALT
, endp
, NULL
, 0,
956 USB_CTRL_SET_TIMEOUT
);
958 /* don't un-halt or force to DATA0 except on success */
962 /* NOTE: seems like Microsoft and Apple don't bother verifying
963 * the clear "took", so some devices could lock up if you check...
964 * such as the Hagiwara FlashGate DUAL. So we won't bother.
966 * NOTE: make sure the logic here doesn't diverge much from
967 * the copy in usb-storage, for as long as we need two copies.
970 /* toggle was reset by the clear */
971 usb_settoggle(dev
, usb_pipeendpoint(pipe
), usb_pipeout(pipe
), 0);
977 * usb_disable_endpoint -- Disable an endpoint by address
978 * @dev: the device whose endpoint is being disabled
979 * @epaddr: the endpoint's address. Endpoint number for output,
980 * endpoint number + USB_DIR_IN for input
982 * Deallocates hcd/hardware state for this endpoint ... and nukes all
985 * If the HCD hasn't registered a disable() function, this sets the
986 * endpoint's maxpacket size to 0 to prevent further submissions.
988 void usb_disable_endpoint(struct usb_device
*dev
, unsigned int epaddr
)
990 unsigned int epnum
= epaddr
& USB_ENDPOINT_NUMBER_MASK
;
991 struct usb_host_endpoint
*ep
;
996 if (usb_endpoint_out(epaddr
)) {
997 ep
= dev
->ep_out
[epnum
];
998 dev
->ep_out
[epnum
] = NULL
;
1000 ep
= dev
->ep_in
[epnum
];
1001 dev
->ep_in
[epnum
] = NULL
;
1003 if (ep
&& dev
->bus
&& dev
->bus
->op
&& dev
->bus
->op
->disable
)
1004 dev
->bus
->op
->disable(dev
, ep
);
1008 * usb_disable_interface -- Disable all endpoints for an interface
1009 * @dev: the device whose interface is being disabled
1010 * @intf: pointer to the interface descriptor
1012 * Disables all the endpoints for the interface's current altsetting.
1014 void usb_disable_interface(struct usb_device
*dev
, struct usb_interface
*intf
)
1016 struct usb_host_interface
*alt
= intf
->cur_altsetting
;
1019 for (i
= 0; i
< alt
->desc
.bNumEndpoints
; ++i
) {
1020 usb_disable_endpoint(dev
,
1021 alt
->endpoint
[i
].desc
.bEndpointAddress
);
1026 * usb_disable_device - Disable all the endpoints for a USB device
1027 * @dev: the device whose endpoints are being disabled
1028 * @skip_ep0: 0 to disable endpoint 0, 1 to skip it.
1030 * Disables all the device's endpoints, potentially including endpoint 0.
1031 * Deallocates hcd/hardware state for the endpoints (nuking all or most
1032 * pending urbs) and usbcore state for the interfaces, so that usbcore
1033 * must usb_set_configuration() before any interfaces could be used.
1035 void usb_disable_device(struct usb_device
*dev
, int skip_ep0
)
1039 dev_dbg(&dev
->dev
, "%s nuking %s URBs\n", __FUNCTION__
,
1040 skip_ep0
? "non-ep0" : "all");
1041 for (i
= skip_ep0
; i
< 16; ++i
) {
1042 usb_disable_endpoint(dev
, i
);
1043 usb_disable_endpoint(dev
, i
+ USB_DIR_IN
);
1045 dev
->toggle
[0] = dev
->toggle
[1] = 0;
1047 /* getting rid of interfaces will disconnect
1048 * any drivers bound to them (a key side effect)
1050 if (dev
->actconfig
) {
1051 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++) {
1052 struct usb_interface
*interface
;
1054 /* remove this interface if it has been registered */
1055 interface
= dev
->actconfig
->interface
[i
];
1056 if (!device_is_registered(&interface
->dev
))
1058 dev_dbg (&dev
->dev
, "unregistering interface %s\n",
1059 interface
->dev
.bus_id
);
1060 usb_remove_sysfs_intf_files(interface
);
1061 device_del (&interface
->dev
);
1064 /* Now that the interfaces are unbound, nobody should
1065 * try to access them.
1067 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++) {
1068 put_device (&dev
->actconfig
->interface
[i
]->dev
);
1069 dev
->actconfig
->interface
[i
] = NULL
;
1071 dev
->actconfig
= NULL
;
1072 if (dev
->state
== USB_STATE_CONFIGURED
)
1073 usb_set_device_state(dev
, USB_STATE_ADDRESS
);
1079 * usb_enable_endpoint - Enable an endpoint for USB communications
1080 * @dev: the device whose interface is being enabled
1083 * Resets the endpoint toggle, and sets dev->ep_{in,out} pointers.
1084 * For control endpoints, both the input and output sides are handled.
1087 usb_enable_endpoint(struct usb_device
*dev
, struct usb_host_endpoint
*ep
)
1089 unsigned int epaddr
= ep
->desc
.bEndpointAddress
;
1090 unsigned int epnum
= epaddr
& USB_ENDPOINT_NUMBER_MASK
;
1093 is_control
= ((ep
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
1094 == USB_ENDPOINT_XFER_CONTROL
);
1095 if (usb_endpoint_out(epaddr
) || is_control
) {
1096 usb_settoggle(dev
, epnum
, 1, 0);
1097 dev
->ep_out
[epnum
] = ep
;
1099 if (!usb_endpoint_out(epaddr
) || is_control
) {
1100 usb_settoggle(dev
, epnum
, 0, 0);
1101 dev
->ep_in
[epnum
] = ep
;
1106 * usb_enable_interface - Enable all the endpoints for an interface
1107 * @dev: the device whose interface is being enabled
1108 * @intf: pointer to the interface descriptor
1110 * Enables all the endpoints for the interface's current altsetting.
1112 static void usb_enable_interface(struct usb_device
*dev
,
1113 struct usb_interface
*intf
)
1115 struct usb_host_interface
*alt
= intf
->cur_altsetting
;
1118 for (i
= 0; i
< alt
->desc
.bNumEndpoints
; ++i
)
1119 usb_enable_endpoint(dev
, &alt
->endpoint
[i
]);
1123 * usb_set_interface - Makes a particular alternate setting be current
1124 * @dev: the device whose interface is being updated
1125 * @interface: the interface being updated
1126 * @alternate: the setting being chosen.
1127 * Context: !in_interrupt ()
1129 * This is used to enable data transfers on interfaces that may not
1130 * be enabled by default. Not all devices support such configurability.
1131 * Only the driver bound to an interface may change its setting.
1133 * Within any given configuration, each interface may have several
1134 * alternative settings. These are often used to control levels of
1135 * bandwidth consumption. For example, the default setting for a high
1136 * speed interrupt endpoint may not send more than 64 bytes per microframe,
1137 * while interrupt transfers of up to 3KBytes per microframe are legal.
1138 * Also, isochronous endpoints may never be part of an
1139 * interface's default setting. To access such bandwidth, alternate
1140 * interface settings must be made current.
1142 * Note that in the Linux USB subsystem, bandwidth associated with
1143 * an endpoint in a given alternate setting is not reserved until an URB
1144 * is submitted that needs that bandwidth. Some other operating systems
1145 * allocate bandwidth early, when a configuration is chosen.
1147 * This call is synchronous, and may not be used in an interrupt context.
1148 * Also, drivers must not change altsettings while urbs are scheduled for
1149 * endpoints in that interface; all such urbs must first be completed
1150 * (perhaps forced by unlinking).
1152 * Returns zero on success, or else the status code returned by the
1153 * underlying usb_control_msg() call.
1155 int usb_set_interface(struct usb_device
*dev
, int interface
, int alternate
)
1157 struct usb_interface
*iface
;
1158 struct usb_host_interface
*alt
;
1162 if (dev
->state
== USB_STATE_SUSPENDED
)
1163 return -EHOSTUNREACH
;
1165 iface
= usb_ifnum_to_if(dev
, interface
);
1167 dev_dbg(&dev
->dev
, "selecting invalid interface %d\n",
1172 alt
= usb_altnum_to_altsetting(iface
, alternate
);
1174 warn("selecting invalid altsetting %d", alternate
);
1178 ret
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
1179 USB_REQ_SET_INTERFACE
, USB_RECIP_INTERFACE
,
1180 alternate
, interface
, NULL
, 0, 5000);
1182 /* 9.4.10 says devices don't need this and are free to STALL the
1183 * request if the interface only has one alternate setting.
1185 if (ret
== -EPIPE
&& iface
->num_altsetting
== 1) {
1187 "manual set_interface for iface %d, alt %d\n",
1188 interface
, alternate
);
1193 /* FIXME drivers shouldn't need to replicate/bugfix the logic here
1194 * when they implement async or easily-killable versions of this or
1195 * other "should-be-internal" functions (like clear_halt).
1196 * should hcd+usbcore postprocess control requests?
1199 /* prevent submissions using previous endpoint settings */
1200 if (device_is_registered(&iface
->dev
))
1201 usb_remove_sysfs_intf_files(iface
);
1202 usb_disable_interface(dev
, iface
);
1204 iface
->cur_altsetting
= alt
;
1206 /* If the interface only has one altsetting and the device didn't
1207 * accept the request, we attempt to carry out the equivalent action
1208 * by manually clearing the HALT feature for each endpoint in the
1214 for (i
= 0; i
< alt
->desc
.bNumEndpoints
; i
++) {
1215 unsigned int epaddr
=
1216 alt
->endpoint
[i
].desc
.bEndpointAddress
;
1218 __create_pipe(dev
, USB_ENDPOINT_NUMBER_MASK
& epaddr
)
1219 | (usb_endpoint_out(epaddr
) ? USB_DIR_OUT
: USB_DIR_IN
);
1221 usb_clear_halt(dev
, pipe
);
1225 /* 9.1.1.5: reset toggles for all endpoints in the new altsetting
1228 * Despite EP0 is always present in all interfaces/AS, the list of
1229 * endpoints from the descriptor does not contain EP0. Due to its
1230 * omnipresence one might expect EP0 being considered "affected" by
1231 * any SetInterface request and hence assume toggles need to be reset.
1232 * However, EP0 toggles are re-synced for every individual transfer
1233 * during the SETUP stage - hence EP0 toggles are "don't care" here.
1234 * (Likewise, EP0 never "halts" on well designed devices.)
1236 usb_enable_interface(dev
, iface
);
1237 if (device_is_registered(&iface
->dev
))
1238 usb_create_sysfs_intf_files(iface
);
1244 * usb_reset_configuration - lightweight device reset
1245 * @dev: the device whose configuration is being reset
1247 * This issues a standard SET_CONFIGURATION request to the device using
1248 * the current configuration. The effect is to reset most USB-related
1249 * state in the device, including interface altsettings (reset to zero),
1250 * endpoint halts (cleared), and data toggle (only for bulk and interrupt
1251 * endpoints). Other usbcore state is unchanged, including bindings of
1252 * usb device drivers to interfaces.
1254 * Because this affects multiple interfaces, avoid using this with composite
1255 * (multi-interface) devices. Instead, the driver for each interface may
1256 * use usb_set_interface() on the interfaces it claims. Be careful though;
1257 * some devices don't support the SET_INTERFACE request, and others won't
1258 * reset all the interface state (notably data toggles). Resetting the whole
1259 * configuration would affect other drivers' interfaces.
1261 * The caller must own the device lock.
1263 * Returns zero on success, else a negative error code.
1265 int usb_reset_configuration(struct usb_device
*dev
)
1268 struct usb_host_config
*config
;
1270 if (dev
->state
== USB_STATE_SUSPENDED
)
1271 return -EHOSTUNREACH
;
1273 /* caller must have locked the device and must own
1274 * the usb bus readlock (so driver bindings are stable);
1275 * calls during probe() are fine
1278 for (i
= 1; i
< 16; ++i
) {
1279 usb_disable_endpoint(dev
, i
);
1280 usb_disable_endpoint(dev
, i
+ USB_DIR_IN
);
1283 config
= dev
->actconfig
;
1284 retval
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
1285 USB_REQ_SET_CONFIGURATION
, 0,
1286 config
->desc
.bConfigurationValue
, 0,
1287 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1291 dev
->toggle
[0] = dev
->toggle
[1] = 0;
1293 /* re-init hc/hcd interface/endpoint state */
1294 for (i
= 0; i
< config
->desc
.bNumInterfaces
; i
++) {
1295 struct usb_interface
*intf
= config
->interface
[i
];
1296 struct usb_host_interface
*alt
;
1298 if (device_is_registered(&intf
->dev
))
1299 usb_remove_sysfs_intf_files(intf
);
1300 alt
= usb_altnum_to_altsetting(intf
, 0);
1302 /* No altsetting 0? We'll assume the first altsetting.
1303 * We could use a GetInterface call, but if a device is
1304 * so non-compliant that it doesn't have altsetting 0
1305 * then I wouldn't trust its reply anyway.
1308 alt
= &intf
->altsetting
[0];
1310 intf
->cur_altsetting
= alt
;
1311 usb_enable_interface(dev
, intf
);
1312 if (device_is_registered(&intf
->dev
))
1313 usb_create_sysfs_intf_files(intf
);
1318 static void release_interface(struct device
*dev
)
1320 struct usb_interface
*intf
= to_usb_interface(dev
);
1321 struct usb_interface_cache
*intfc
=
1322 altsetting_to_usb_interface_cache(intf
->altsetting
);
1324 kref_put(&intfc
->ref
, usb_release_interface_cache
);
1329 * usb_set_configuration - Makes a particular device setting be current
1330 * @dev: the device whose configuration is being updated
1331 * @configuration: the configuration being chosen.
1332 * Context: !in_interrupt(), caller owns the device lock
1334 * This is used to enable non-default device modes. Not all devices
1335 * use this kind of configurability; many devices only have one
1338 * USB device configurations may affect Linux interoperability,
1339 * power consumption and the functionality available. For example,
1340 * the default configuration is limited to using 100mA of bus power,
1341 * so that when certain device functionality requires more power,
1342 * and the device is bus powered, that functionality should be in some
1343 * non-default device configuration. Other device modes may also be
1344 * reflected as configuration options, such as whether two ISDN
1345 * channels are available independently; and choosing between open
1346 * standard device protocols (like CDC) or proprietary ones.
1348 * Note that USB has an additional level of device configurability,
1349 * associated with interfaces. That configurability is accessed using
1350 * usb_set_interface().
1352 * This call is synchronous. The calling context must be able to sleep,
1353 * must own the device lock, and must not hold the driver model's USB
1354 * bus rwsem; usb device driver probe() methods cannot use this routine.
1356 * Returns zero on success, or else the status code returned by the
1357 * underlying call that failed. On successful completion, each interface
1358 * in the original device configuration has been destroyed, and each one
1359 * in the new configuration has been probed by all relevant usb device
1360 * drivers currently known to the kernel.
1362 int usb_set_configuration(struct usb_device
*dev
, int configuration
)
1365 struct usb_host_config
*cp
= NULL
;
1366 struct usb_interface
**new_interfaces
= NULL
;
1369 for (i
= 0; i
< dev
->descriptor
.bNumConfigurations
; i
++) {
1370 if (dev
->config
[i
].desc
.bConfigurationValue
== configuration
) {
1371 cp
= &dev
->config
[i
];
1375 if ((!cp
&& configuration
!= 0))
1378 /* The USB spec says configuration 0 means unconfigured.
1379 * But if a device includes a configuration numbered 0,
1380 * we will accept it as a correctly configured state.
1382 if (cp
&& configuration
== 0)
1383 dev_warn(&dev
->dev
, "config 0 descriptor??\n");
1385 if (dev
->state
== USB_STATE_SUSPENDED
)
1386 return -EHOSTUNREACH
;
1388 /* Allocate memory for new interfaces before doing anything else,
1389 * so that if we run out then nothing will have changed. */
1392 nintf
= cp
->desc
.bNumInterfaces
;
1393 new_interfaces
= kmalloc(nintf
* sizeof(*new_interfaces
),
1395 if (!new_interfaces
) {
1396 dev_err(&dev
->dev
, "Out of memory");
1400 for (; n
< nintf
; ++n
) {
1401 new_interfaces
[n
] = kzalloc(
1402 sizeof(struct usb_interface
),
1404 if (!new_interfaces
[n
]) {
1405 dev_err(&dev
->dev
, "Out of memory");
1409 kfree(new_interfaces
[n
]);
1410 kfree(new_interfaces
);
1415 i
= dev
->bus_mA
- cp
->desc
.bMaxPower
* 2;
1417 dev_warn(&dev
->dev
, "new config #%d exceeds power "
1422 /* if it's already configured, clear out old state first.
1423 * getting rid of old interfaces means unbinding their drivers.
1425 if (dev
->state
!= USB_STATE_ADDRESS
)
1426 usb_disable_device (dev
, 1); // Skip ep0
1428 if ((ret
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
1429 USB_REQ_SET_CONFIGURATION
, 0, configuration
, 0,
1430 NULL
, 0, USB_CTRL_SET_TIMEOUT
)) < 0) {
1432 /* All the old state is gone, so what else can we do?
1433 * The device is probably useless now anyway.
1438 dev
->actconfig
= cp
;
1440 usb_set_device_state(dev
, USB_STATE_ADDRESS
);
1441 goto free_interfaces
;
1443 usb_set_device_state(dev
, USB_STATE_CONFIGURED
);
1445 /* Initialize the new interface structures and the
1446 * hc/hcd/usbcore interface/endpoint state.
1448 for (i
= 0; i
< nintf
; ++i
) {
1449 struct usb_interface_cache
*intfc
;
1450 struct usb_interface
*intf
;
1451 struct usb_host_interface
*alt
;
1453 cp
->interface
[i
] = intf
= new_interfaces
[i
];
1454 intfc
= cp
->intf_cache
[i
];
1455 intf
->altsetting
= intfc
->altsetting
;
1456 intf
->num_altsetting
= intfc
->num_altsetting
;
1457 kref_get(&intfc
->ref
);
1459 alt
= usb_altnum_to_altsetting(intf
, 0);
1461 /* No altsetting 0? We'll assume the first altsetting.
1462 * We could use a GetInterface call, but if a device is
1463 * so non-compliant that it doesn't have altsetting 0
1464 * then I wouldn't trust its reply anyway.
1467 alt
= &intf
->altsetting
[0];
1469 intf
->cur_altsetting
= alt
;
1470 usb_enable_interface(dev
, intf
);
1471 intf
->dev
.parent
= &dev
->dev
;
1472 intf
->dev
.driver
= NULL
;
1473 intf
->dev
.bus
= &usb_bus_type
;
1474 intf
->dev
.dma_mask
= dev
->dev
.dma_mask
;
1475 intf
->dev
.release
= release_interface
;
1476 device_initialize (&intf
->dev
);
1477 mark_quiesced(intf
);
1478 sprintf (&intf
->dev
.bus_id
[0], "%d-%s:%d.%d",
1479 dev
->bus
->busnum
, dev
->devpath
,
1480 configuration
, alt
->desc
.bInterfaceNumber
);
1482 kfree(new_interfaces
);
1484 if (cp
->string
== NULL
)
1485 cp
->string
= usb_cache_string(dev
, cp
->desc
.iConfiguration
);
1487 /* Now that all the interfaces are set up, register them
1488 * to trigger binding of drivers to interfaces. probe()
1489 * routines may install different altsettings and may
1490 * claim() any interfaces not yet bound. Many class drivers
1491 * need that: CDC, audio, video, etc.
1493 for (i
= 0; i
< nintf
; ++i
) {
1494 struct usb_interface
*intf
= cp
->interface
[i
];
1497 "adding %s (config #%d, interface %d)\n",
1498 intf
->dev
.bus_id
, configuration
,
1499 intf
->cur_altsetting
->desc
.bInterfaceNumber
);
1500 ret
= device_add (&intf
->dev
);
1502 dev_err(&dev
->dev
, "device_add(%s) --> %d\n",
1503 intf
->dev
.bus_id
, ret
);
1506 usb_create_sysfs_intf_files (intf
);
1512 // synchronous request completion model
1513 EXPORT_SYMBOL(usb_control_msg
);
1514 EXPORT_SYMBOL(usb_bulk_msg
);
1516 EXPORT_SYMBOL(usb_sg_init
);
1517 EXPORT_SYMBOL(usb_sg_cancel
);
1518 EXPORT_SYMBOL(usb_sg_wait
);
1520 // synchronous control message convenience routines
1521 EXPORT_SYMBOL(usb_get_descriptor
);
1522 EXPORT_SYMBOL(usb_get_status
);
1523 EXPORT_SYMBOL(usb_string
);
1525 // synchronous calls that also maintain usbcore state
1526 EXPORT_SYMBOL(usb_clear_halt
);
1527 EXPORT_SYMBOL(usb_reset_configuration
);
1528 EXPORT_SYMBOL(usb_set_interface
);