include: replace linux/module.h with "struct module" wherever possible
[linux-2.6/next.git] / drivers / usb / core / config.c
blob26678cadfb215340e35a9b56f5fe23954a13cdd9
1 #include <linux/usb.h>
2 #include <linux/usb/ch9.h>
3 #include <linux/usb/hcd.h>
4 #include <linux/usb/quirks.h>
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/slab.h>
8 #include <linux/device.h>
9 #include <asm/byteorder.h>
10 #include "usb.h"
13 #define USB_MAXALTSETTING 128 /* Hard limit */
14 #define USB_MAXENDPOINTS 30 /* Hard limit */
16 #define USB_MAXCONFIG 8 /* Arbitrary limit */
19 static inline const char *plural(int n)
21 return (n == 1 ? "" : "s");
24 static int find_next_descriptor(unsigned char *buffer, int size,
25 int dt1, int dt2, int *num_skipped)
27 struct usb_descriptor_header *h;
28 int n = 0;
29 unsigned char *buffer0 = buffer;
31 /* Find the next descriptor of type dt1 or dt2 */
32 while (size > 0) {
33 h = (struct usb_descriptor_header *) buffer;
34 if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
35 break;
36 buffer += h->bLength;
37 size -= h->bLength;
38 ++n;
41 /* Store the number of descriptors skipped and return the
42 * number of bytes skipped */
43 if (num_skipped)
44 *num_skipped = n;
45 return buffer - buffer0;
48 static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
49 int inum, int asnum, struct usb_host_endpoint *ep,
50 unsigned char *buffer, int size)
52 struct usb_ss_ep_comp_descriptor *desc;
53 int max_tx;
55 /* The SuperSpeed endpoint companion descriptor is supposed to
56 * be the first thing immediately following the endpoint descriptor.
58 desc = (struct usb_ss_ep_comp_descriptor *) buffer;
59 if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP ||
60 size < USB_DT_SS_EP_COMP_SIZE) {
61 dev_warn(ddev, "No SuperSpeed endpoint companion for config %d "
62 " interface %d altsetting %d ep %d: "
63 "using minimum values\n",
64 cfgno, inum, asnum, ep->desc.bEndpointAddress);
66 /* Fill in some default values.
67 * Leave bmAttributes as zero, which will mean no streams for
68 * bulk, and isoc won't support multiple bursts of packets.
69 * With bursts of only one packet, and a Mult of 1, the max
70 * amount of data moved per endpoint service interval is one
71 * packet.
73 ep->ss_ep_comp.bLength = USB_DT_SS_EP_COMP_SIZE;
74 ep->ss_ep_comp.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
75 if (usb_endpoint_xfer_isoc(&ep->desc) ||
76 usb_endpoint_xfer_int(&ep->desc))
77 ep->ss_ep_comp.wBytesPerInterval =
78 ep->desc.wMaxPacketSize;
79 return;
82 memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE);
84 /* Check the various values */
85 if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) {
86 dev_warn(ddev, "Control endpoint with bMaxBurst = %d in "
87 "config %d interface %d altsetting %d ep %d: "
88 "setting to zero\n", desc->bMaxBurst,
89 cfgno, inum, asnum, ep->desc.bEndpointAddress);
90 ep->ss_ep_comp.bMaxBurst = 0;
91 } else if (desc->bMaxBurst > 15) {
92 dev_warn(ddev, "Endpoint with bMaxBurst = %d in "
93 "config %d interface %d altsetting %d ep %d: "
94 "setting to 15\n", desc->bMaxBurst,
95 cfgno, inum, asnum, ep->desc.bEndpointAddress);
96 ep->ss_ep_comp.bMaxBurst = 15;
99 if ((usb_endpoint_xfer_control(&ep->desc) ||
100 usb_endpoint_xfer_int(&ep->desc)) &&
101 desc->bmAttributes != 0) {
102 dev_warn(ddev, "%s endpoint with bmAttributes = %d in "
103 "config %d interface %d altsetting %d ep %d: "
104 "setting to zero\n",
105 usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
106 desc->bmAttributes,
107 cfgno, inum, asnum, ep->desc.bEndpointAddress);
108 ep->ss_ep_comp.bmAttributes = 0;
109 } else if (usb_endpoint_xfer_bulk(&ep->desc) &&
110 desc->bmAttributes > 16) {
111 dev_warn(ddev, "Bulk endpoint with more than 65536 streams in "
112 "config %d interface %d altsetting %d ep %d: "
113 "setting to max\n",
114 cfgno, inum, asnum, ep->desc.bEndpointAddress);
115 ep->ss_ep_comp.bmAttributes = 16;
116 } else if (usb_endpoint_xfer_isoc(&ep->desc) &&
117 desc->bmAttributes > 2) {
118 dev_warn(ddev, "Isoc endpoint has Mult of %d in "
119 "config %d interface %d altsetting %d ep %d: "
120 "setting to 3\n", desc->bmAttributes + 1,
121 cfgno, inum, asnum, ep->desc.bEndpointAddress);
122 ep->ss_ep_comp.bmAttributes = 2;
125 if (usb_endpoint_xfer_isoc(&ep->desc))
126 max_tx = (desc->bMaxBurst + 1) * (desc->bmAttributes + 1) *
127 le16_to_cpu(ep->desc.wMaxPacketSize);
128 else if (usb_endpoint_xfer_int(&ep->desc))
129 max_tx = le16_to_cpu(ep->desc.wMaxPacketSize) *
130 (desc->bMaxBurst + 1);
131 else
132 max_tx = 999999;
133 if (le16_to_cpu(desc->wBytesPerInterval) > max_tx) {
134 dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
135 "config %d interface %d altsetting %d ep %d: "
136 "setting to %d\n",
137 usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
138 le16_to_cpu(desc->wBytesPerInterval),
139 cfgno, inum, asnum, ep->desc.bEndpointAddress,
140 max_tx);
141 ep->ss_ep_comp.wBytesPerInterval = cpu_to_le16(max_tx);
145 static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
146 int asnum, struct usb_host_interface *ifp, int num_ep,
147 unsigned char *buffer, int size)
149 unsigned char *buffer0 = buffer;
150 struct usb_endpoint_descriptor *d;
151 struct usb_host_endpoint *endpoint;
152 int n, i, j, retval;
154 d = (struct usb_endpoint_descriptor *) buffer;
155 buffer += d->bLength;
156 size -= d->bLength;
158 if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
159 n = USB_DT_ENDPOINT_AUDIO_SIZE;
160 else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
161 n = USB_DT_ENDPOINT_SIZE;
162 else {
163 dev_warn(ddev, "config %d interface %d altsetting %d has an "
164 "invalid endpoint descriptor of length %d, skipping\n",
165 cfgno, inum, asnum, d->bLength);
166 goto skip_to_next_endpoint_or_interface_descriptor;
169 i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK;
170 if (i >= 16 || i == 0) {
171 dev_warn(ddev, "config %d interface %d altsetting %d has an "
172 "invalid endpoint with address 0x%X, skipping\n",
173 cfgno, inum, asnum, d->bEndpointAddress);
174 goto skip_to_next_endpoint_or_interface_descriptor;
177 /* Only store as many endpoints as we have room for */
178 if (ifp->desc.bNumEndpoints >= num_ep)
179 goto skip_to_next_endpoint_or_interface_descriptor;
181 endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
182 ++ifp->desc.bNumEndpoints;
184 memcpy(&endpoint->desc, d, n);
185 INIT_LIST_HEAD(&endpoint->urb_list);
187 /* Fix up bInterval values outside the legal range. Use 32 ms if no
188 * proper value can be guessed. */
189 i = 0; /* i = min, j = max, n = default */
190 j = 255;
191 if (usb_endpoint_xfer_int(d)) {
192 i = 1;
193 switch (to_usb_device(ddev)->speed) {
194 case USB_SPEED_SUPER:
195 case USB_SPEED_HIGH:
196 /* Many device manufacturers are using full-speed
197 * bInterval values in high-speed interrupt endpoint
198 * descriptors. Try to fix those and fall back to a
199 * 32 ms default value otherwise. */
200 n = fls(d->bInterval*8);
201 if (n == 0)
202 n = 9; /* 32 ms = 2^(9-1) uframes */
203 j = 16;
204 break;
205 default: /* USB_SPEED_FULL or _LOW */
206 /* For low-speed, 10 ms is the official minimum.
207 * But some "overclocked" devices might want faster
208 * polling so we'll allow it. */
209 n = 32;
210 break;
212 } else if (usb_endpoint_xfer_isoc(d)) {
213 i = 1;
214 j = 16;
215 switch (to_usb_device(ddev)->speed) {
216 case USB_SPEED_HIGH:
217 n = 9; /* 32 ms = 2^(9-1) uframes */
218 break;
219 default: /* USB_SPEED_FULL */
220 n = 6; /* 32 ms = 2^(6-1) frames */
221 break;
224 if (d->bInterval < i || d->bInterval > j) {
225 dev_warn(ddev, "config %d interface %d altsetting %d "
226 "endpoint 0x%X has an invalid bInterval %d, "
227 "changing to %d\n",
228 cfgno, inum, asnum,
229 d->bEndpointAddress, d->bInterval, n);
230 endpoint->desc.bInterval = n;
233 /* Some buggy low-speed devices have Bulk endpoints, which is
234 * explicitly forbidden by the USB spec. In an attempt to make
235 * them usable, we will try treating them as Interrupt endpoints.
237 if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
238 usb_endpoint_xfer_bulk(d)) {
239 dev_warn(ddev, "config %d interface %d altsetting %d "
240 "endpoint 0x%X is Bulk; changing to Interrupt\n",
241 cfgno, inum, asnum, d->bEndpointAddress);
242 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
243 endpoint->desc.bInterval = 1;
244 if (le16_to_cpu(endpoint->desc.wMaxPacketSize) > 8)
245 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
249 * Some buggy high speed devices have bulk endpoints using
250 * maxpacket sizes other than 512. High speed HCDs may not
251 * be able to handle that particular bug, so let's warn...
253 if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
254 && usb_endpoint_xfer_bulk(d)) {
255 unsigned maxp;
257 maxp = le16_to_cpu(endpoint->desc.wMaxPacketSize) & 0x07ff;
258 if (maxp != 512)
259 dev_warn(ddev, "config %d interface %d altsetting %d "
260 "bulk endpoint 0x%X has invalid maxpacket %d\n",
261 cfgno, inum, asnum, d->bEndpointAddress,
262 maxp);
265 /* Parse a possible SuperSpeed endpoint companion descriptor */
266 if (to_usb_device(ddev)->speed == USB_SPEED_SUPER)
267 usb_parse_ss_endpoint_companion(ddev, cfgno,
268 inum, asnum, endpoint, buffer, size);
270 /* Skip over any Class Specific or Vendor Specific descriptors;
271 * find the next endpoint or interface descriptor */
272 endpoint->extra = buffer;
273 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
274 USB_DT_INTERFACE, &n);
275 endpoint->extralen = i;
276 retval = buffer - buffer0 + i;
277 if (n > 0)
278 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
279 n, plural(n), "endpoint");
280 return retval;
282 skip_to_next_endpoint_or_interface_descriptor:
283 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
284 USB_DT_INTERFACE, NULL);
285 return buffer - buffer0 + i;
288 void usb_release_interface_cache(struct kref *ref)
290 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
291 int j;
293 for (j = 0; j < intfc->num_altsetting; j++) {
294 struct usb_host_interface *alt = &intfc->altsetting[j];
296 kfree(alt->endpoint);
297 kfree(alt->string);
299 kfree(intfc);
302 static int usb_parse_interface(struct device *ddev, int cfgno,
303 struct usb_host_config *config, unsigned char *buffer, int size,
304 u8 inums[], u8 nalts[])
306 unsigned char *buffer0 = buffer;
307 struct usb_interface_descriptor *d;
308 int inum, asnum;
309 struct usb_interface_cache *intfc;
310 struct usb_host_interface *alt;
311 int i, n;
312 int len, retval;
313 int num_ep, num_ep_orig;
315 d = (struct usb_interface_descriptor *) buffer;
316 buffer += d->bLength;
317 size -= d->bLength;
319 if (d->bLength < USB_DT_INTERFACE_SIZE)
320 goto skip_to_next_interface_descriptor;
322 /* Which interface entry is this? */
323 intfc = NULL;
324 inum = d->bInterfaceNumber;
325 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
326 if (inums[i] == inum) {
327 intfc = config->intf_cache[i];
328 break;
331 if (!intfc || intfc->num_altsetting >= nalts[i])
332 goto skip_to_next_interface_descriptor;
334 /* Check for duplicate altsetting entries */
335 asnum = d->bAlternateSetting;
336 for ((i = 0, alt = &intfc->altsetting[0]);
337 i < intfc->num_altsetting;
338 (++i, ++alt)) {
339 if (alt->desc.bAlternateSetting == asnum) {
340 dev_warn(ddev, "Duplicate descriptor for config %d "
341 "interface %d altsetting %d, skipping\n",
342 cfgno, inum, asnum);
343 goto skip_to_next_interface_descriptor;
347 ++intfc->num_altsetting;
348 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
350 /* Skip over any Class Specific or Vendor Specific descriptors;
351 * find the first endpoint or interface descriptor */
352 alt->extra = buffer;
353 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
354 USB_DT_INTERFACE, &n);
355 alt->extralen = i;
356 if (n > 0)
357 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
358 n, plural(n), "interface");
359 buffer += i;
360 size -= i;
362 /* Allocate space for the right(?) number of endpoints */
363 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
364 alt->desc.bNumEndpoints = 0; /* Use as a counter */
365 if (num_ep > USB_MAXENDPOINTS) {
366 dev_warn(ddev, "too many endpoints for config %d interface %d "
367 "altsetting %d: %d, using maximum allowed: %d\n",
368 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
369 num_ep = USB_MAXENDPOINTS;
372 if (num_ep > 0) {
373 /* Can't allocate 0 bytes */
374 len = sizeof(struct usb_host_endpoint) * num_ep;
375 alt->endpoint = kzalloc(len, GFP_KERNEL);
376 if (!alt->endpoint)
377 return -ENOMEM;
380 /* Parse all the endpoint descriptors */
381 n = 0;
382 while (size > 0) {
383 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
384 == USB_DT_INTERFACE)
385 break;
386 retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
387 num_ep, buffer, size);
388 if (retval < 0)
389 return retval;
390 ++n;
392 buffer += retval;
393 size -= retval;
396 if (n != num_ep_orig)
397 dev_warn(ddev, "config %d interface %d altsetting %d has %d "
398 "endpoint descriptor%s, different from the interface "
399 "descriptor's value: %d\n",
400 cfgno, inum, asnum, n, plural(n), num_ep_orig);
401 return buffer - buffer0;
403 skip_to_next_interface_descriptor:
404 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
405 USB_DT_INTERFACE, NULL);
406 return buffer - buffer0 + i;
409 static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
410 struct usb_host_config *config, unsigned char *buffer, int size)
412 struct device *ddev = &dev->dev;
413 unsigned char *buffer0 = buffer;
414 int cfgno;
415 int nintf, nintf_orig;
416 int i, j, n;
417 struct usb_interface_cache *intfc;
418 unsigned char *buffer2;
419 int size2;
420 struct usb_descriptor_header *header;
421 int len, retval;
422 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
423 unsigned iad_num = 0;
425 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
426 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
427 config->desc.bLength < USB_DT_CONFIG_SIZE) {
428 dev_err(ddev, "invalid descriptor for config index %d: "
429 "type = 0x%X, length = %d\n", cfgidx,
430 config->desc.bDescriptorType, config->desc.bLength);
431 return -EINVAL;
433 cfgno = config->desc.bConfigurationValue;
435 buffer += config->desc.bLength;
436 size -= config->desc.bLength;
438 nintf = nintf_orig = config->desc.bNumInterfaces;
439 if (nintf > USB_MAXINTERFACES) {
440 dev_warn(ddev, "config %d has too many interfaces: %d, "
441 "using maximum allowed: %d\n",
442 cfgno, nintf, USB_MAXINTERFACES);
443 nintf = USB_MAXINTERFACES;
446 /* Go through the descriptors, checking their length and counting the
447 * number of altsettings for each interface */
448 n = 0;
449 for ((buffer2 = buffer, size2 = size);
450 size2 > 0;
451 (buffer2 += header->bLength, size2 -= header->bLength)) {
453 if (size2 < sizeof(struct usb_descriptor_header)) {
454 dev_warn(ddev, "config %d descriptor has %d excess "
455 "byte%s, ignoring\n",
456 cfgno, size2, plural(size2));
457 break;
460 header = (struct usb_descriptor_header *) buffer2;
461 if ((header->bLength > size2) || (header->bLength < 2)) {
462 dev_warn(ddev, "config %d has an invalid descriptor "
463 "of length %d, skipping remainder of the config\n",
464 cfgno, header->bLength);
465 break;
468 if (header->bDescriptorType == USB_DT_INTERFACE) {
469 struct usb_interface_descriptor *d;
470 int inum;
472 d = (struct usb_interface_descriptor *) header;
473 if (d->bLength < USB_DT_INTERFACE_SIZE) {
474 dev_warn(ddev, "config %d has an invalid "
475 "interface descriptor of length %d, "
476 "skipping\n", cfgno, d->bLength);
477 continue;
480 inum = d->bInterfaceNumber;
482 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
483 n >= nintf_orig) {
484 dev_warn(ddev, "config %d has more interface "
485 "descriptors, than it declares in "
486 "bNumInterfaces, ignoring interface "
487 "number: %d\n", cfgno, inum);
488 continue;
491 if (inum >= nintf_orig)
492 dev_warn(ddev, "config %d has an invalid "
493 "interface number: %d but max is %d\n",
494 cfgno, inum, nintf_orig - 1);
496 /* Have we already encountered this interface?
497 * Count its altsettings */
498 for (i = 0; i < n; ++i) {
499 if (inums[i] == inum)
500 break;
502 if (i < n) {
503 if (nalts[i] < 255)
504 ++nalts[i];
505 } else if (n < USB_MAXINTERFACES) {
506 inums[n] = inum;
507 nalts[n] = 1;
508 ++n;
511 } else if (header->bDescriptorType ==
512 USB_DT_INTERFACE_ASSOCIATION) {
513 if (iad_num == USB_MAXIADS) {
514 dev_warn(ddev, "found more Interface "
515 "Association Descriptors "
516 "than allocated for in "
517 "configuration %d\n", cfgno);
518 } else {
519 config->intf_assoc[iad_num] =
520 (struct usb_interface_assoc_descriptor
521 *)header;
522 iad_num++;
525 } else if (header->bDescriptorType == USB_DT_DEVICE ||
526 header->bDescriptorType == USB_DT_CONFIG)
527 dev_warn(ddev, "config %d contains an unexpected "
528 "descriptor of type 0x%X, skipping\n",
529 cfgno, header->bDescriptorType);
531 } /* for ((buffer2 = buffer, size2 = size); ...) */
532 size = buffer2 - buffer;
533 config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
535 if (n != nintf)
536 dev_warn(ddev, "config %d has %d interface%s, different from "
537 "the descriptor's value: %d\n",
538 cfgno, n, plural(n), nintf_orig);
539 else if (n == 0)
540 dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
541 config->desc.bNumInterfaces = nintf = n;
543 /* Check for missing interface numbers */
544 for (i = 0; i < nintf; ++i) {
545 for (j = 0; j < nintf; ++j) {
546 if (inums[j] == i)
547 break;
549 if (j >= nintf)
550 dev_warn(ddev, "config %d has no interface number "
551 "%d\n", cfgno, i);
554 /* Allocate the usb_interface_caches and altsetting arrays */
555 for (i = 0; i < nintf; ++i) {
556 j = nalts[i];
557 if (j > USB_MAXALTSETTING) {
558 dev_warn(ddev, "too many alternate settings for "
559 "config %d interface %d: %d, "
560 "using maximum allowed: %d\n",
561 cfgno, inums[i], j, USB_MAXALTSETTING);
562 nalts[i] = j = USB_MAXALTSETTING;
565 len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
566 config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
567 if (!intfc)
568 return -ENOMEM;
569 kref_init(&intfc->ref);
572 /* FIXME: parse the BOS descriptor */
574 /* Skip over any Class Specific or Vendor Specific descriptors;
575 * find the first interface descriptor */
576 config->extra = buffer;
577 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
578 USB_DT_INTERFACE, &n);
579 config->extralen = i;
580 if (n > 0)
581 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
582 n, plural(n), "configuration");
583 buffer += i;
584 size -= i;
586 /* Parse all the interface/altsetting descriptors */
587 while (size > 0) {
588 retval = usb_parse_interface(ddev, cfgno, config,
589 buffer, size, inums, nalts);
590 if (retval < 0)
591 return retval;
593 buffer += retval;
594 size -= retval;
597 /* Check for missing altsettings */
598 for (i = 0; i < nintf; ++i) {
599 intfc = config->intf_cache[i];
600 for (j = 0; j < intfc->num_altsetting; ++j) {
601 for (n = 0; n < intfc->num_altsetting; ++n) {
602 if (intfc->altsetting[n].desc.
603 bAlternateSetting == j)
604 break;
606 if (n >= intfc->num_altsetting)
607 dev_warn(ddev, "config %d interface %d has no "
608 "altsetting %d\n", cfgno, inums[i], j);
612 return 0;
615 /* hub-only!! ... and only exported for reset/reinit path.
616 * otherwise used internally on disconnect/destroy path
618 void usb_destroy_configuration(struct usb_device *dev)
620 int c, i;
622 if (!dev->config)
623 return;
625 if (dev->rawdescriptors) {
626 for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
627 kfree(dev->rawdescriptors[i]);
629 kfree(dev->rawdescriptors);
630 dev->rawdescriptors = NULL;
633 for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
634 struct usb_host_config *cf = &dev->config[c];
636 kfree(cf->string);
637 for (i = 0; i < cf->desc.bNumInterfaces; i++) {
638 if (cf->intf_cache[i])
639 kref_put(&cf->intf_cache[i]->ref,
640 usb_release_interface_cache);
643 kfree(dev->config);
644 dev->config = NULL;
649 * Get the USB config descriptors, cache and parse'em
651 * hub-only!! ... and only in reset path, or usb_new_device()
652 * (used by real hubs and virtual root hubs)
654 * NOTE: if this is a WUSB device and is not authorized, we skip the
655 * whole thing. A non-authorized USB device has no
656 * configurations.
658 int usb_get_configuration(struct usb_device *dev)
660 struct device *ddev = &dev->dev;
661 int ncfg = dev->descriptor.bNumConfigurations;
662 int result = 0;
663 unsigned int cfgno, length;
664 unsigned char *bigbuffer;
665 struct usb_config_descriptor *desc;
667 cfgno = 0;
668 if (dev->authorized == 0) /* Not really an error */
669 goto out_not_authorized;
670 result = -ENOMEM;
671 if (ncfg > USB_MAXCONFIG) {
672 dev_warn(ddev, "too many configurations: %d, "
673 "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
674 dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
677 if (ncfg < 1) {
678 dev_err(ddev, "no configurations\n");
679 return -EINVAL;
682 length = ncfg * sizeof(struct usb_host_config);
683 dev->config = kzalloc(length, GFP_KERNEL);
684 if (!dev->config)
685 goto err2;
687 length = ncfg * sizeof(char *);
688 dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
689 if (!dev->rawdescriptors)
690 goto err2;
692 desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
693 if (!desc)
694 goto err2;
696 result = 0;
697 for (; cfgno < ncfg; cfgno++) {
698 /* We grab just the first descriptor so we know how long
699 * the whole configuration is */
700 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
701 desc, USB_DT_CONFIG_SIZE);
702 if (result < 0) {
703 dev_err(ddev, "unable to read config index %d "
704 "descriptor/%s: %d\n", cfgno, "start", result);
705 dev_err(ddev, "chopping to %d config(s)\n", cfgno);
706 dev->descriptor.bNumConfigurations = cfgno;
707 break;
708 } else if (result < 4) {
709 dev_err(ddev, "config index %d descriptor too short "
710 "(expected %i, got %i)\n", cfgno,
711 USB_DT_CONFIG_SIZE, result);
712 result = -EINVAL;
713 goto err;
715 length = max((int) le16_to_cpu(desc->wTotalLength),
716 USB_DT_CONFIG_SIZE);
718 /* Now that we know the length, get the whole thing */
719 bigbuffer = kmalloc(length, GFP_KERNEL);
720 if (!bigbuffer) {
721 result = -ENOMEM;
722 goto err;
724 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
725 bigbuffer, length);
726 if (result < 0) {
727 dev_err(ddev, "unable to read config index %d "
728 "descriptor/%s\n", cfgno, "all");
729 kfree(bigbuffer);
730 goto err;
732 if (result < length) {
733 dev_warn(ddev, "config index %d descriptor too short "
734 "(expected %i, got %i)\n", cfgno, length, result);
735 length = result;
738 dev->rawdescriptors[cfgno] = bigbuffer;
740 result = usb_parse_configuration(dev, cfgno,
741 &dev->config[cfgno], bigbuffer, length);
742 if (result < 0) {
743 ++cfgno;
744 goto err;
747 result = 0;
749 err:
750 kfree(desc);
751 out_not_authorized:
752 dev->descriptor.bNumConfigurations = cfgno;
753 err2:
754 if (result == -ENOMEM)
755 dev_err(ddev, "out of memory\n");
756 return result;