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/slab.h>
7 #include <linux/device.h>
8 #include <asm/byteorder.h>
12 #define USB_MAXALTSETTING 128 /* Hard limit */
13 #define USB_MAXENDPOINTS 30 /* Hard limit */
15 #define USB_MAXCONFIG 8 /* Arbitrary limit */
18 static inline const char *plural(int n)
20 return (n == 1 ? "" : "s");
23 static int find_next_descriptor(unsigned char *buffer, int size,
24 int dt1, int dt2, int *num_skipped)
26 struct usb_descriptor_header *h;
28 unsigned char *buffer0 = buffer;
30 /* Find the next descriptor of type dt1 or dt2 */
32 h = (struct usb_descriptor_header *) buffer;
33 if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
40 /* Store the number of descriptors skipped and return the
41 * number of bytes skipped */
44 return buffer - buffer0;
47 static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
48 int inum, int asnum, struct usb_host_endpoint *ep,
49 unsigned char *buffer, int size)
51 struct usb_ss_ep_comp_descriptor *desc;
54 /* The SuperSpeed endpoint companion descriptor is supposed to
55 * be the first thing immediately following the endpoint descriptor.
57 desc = (struct usb_ss_ep_comp_descriptor *) buffer;
58 if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP ||
59 size < USB_DT_SS_EP_COMP_SIZE) {
60 dev_warn(ddev, "No SuperSpeed endpoint companion for config %d "
61 " interface %d altsetting %d ep %d: "
62 "using minimum values\n",
63 cfgno, inum, asnum, ep->desc.bEndpointAddress);
65 /* Fill in some default values.
66 * Leave bmAttributes as zero, which will mean no streams for
67 * bulk, and isoc won't support multiple bursts of packets.
68 * With bursts of only one packet, and a Mult of 1, the max
69 * amount of data moved per endpoint service interval is one
72 ep->ss_ep_comp.bLength = USB_DT_SS_EP_COMP_SIZE;
73 ep->ss_ep_comp.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
74 if (usb_endpoint_xfer_isoc(&ep->desc) ||
75 usb_endpoint_xfer_int(&ep->desc))
76 ep->ss_ep_comp.wBytesPerInterval =
77 ep->desc.wMaxPacketSize;
81 memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE);
83 /* Check the various values */
84 if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) {
85 dev_warn(ddev, "Control endpoint with bMaxBurst = %d in "
86 "config %d interface %d altsetting %d ep %d: "
87 "setting to zero\n", desc->bMaxBurst,
88 cfgno, inum, asnum, ep->desc.bEndpointAddress);
89 ep->ss_ep_comp.bMaxBurst = 0;
90 } else if (desc->bMaxBurst > 15) {
91 dev_warn(ddev, "Endpoint with bMaxBurst = %d in "
92 "config %d interface %d altsetting %d ep %d: "
93 "setting to 15\n", desc->bMaxBurst,
94 cfgno, inum, asnum, ep->desc.bEndpointAddress);
95 ep->ss_ep_comp.bMaxBurst = 15;
98 if ((usb_endpoint_xfer_control(&ep->desc) ||
99 usb_endpoint_xfer_int(&ep->desc)) &&
100 desc->bmAttributes != 0) {
101 dev_warn(ddev, "%s endpoint with bmAttributes = %d in "
102 "config %d interface %d altsetting %d ep %d: "
104 usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
106 cfgno, inum, asnum, ep->desc.bEndpointAddress);
107 ep->ss_ep_comp.bmAttributes = 0;
108 } else if (usb_endpoint_xfer_bulk(&ep->desc) &&
109 desc->bmAttributes > 16) {
110 dev_warn(ddev, "Bulk endpoint with more than 65536 streams in "
111 "config %d interface %d altsetting %d ep %d: "
113 cfgno, inum, asnum, ep->desc.bEndpointAddress);
114 ep->ss_ep_comp.bmAttributes = 16;
115 } else if (usb_endpoint_xfer_isoc(&ep->desc) &&
116 desc->bmAttributes > 2) {
117 dev_warn(ddev, "Isoc endpoint has Mult of %d in "
118 "config %d interface %d altsetting %d ep %d: "
119 "setting to 3\n", desc->bmAttributes + 1,
120 cfgno, inum, asnum, ep->desc.bEndpointAddress);
121 ep->ss_ep_comp.bmAttributes = 2;
124 if (usb_endpoint_xfer_isoc(&ep->desc))
125 max_tx = (desc->bMaxBurst + 1) * (desc->bmAttributes + 1) *
126 usb_endpoint_maxp(&ep->desc);
127 else if (usb_endpoint_xfer_int(&ep->desc))
128 max_tx = usb_endpoint_maxp(&ep->desc) *
129 (desc->bMaxBurst + 1);
132 if (le16_to_cpu(desc->wBytesPerInterval) > max_tx) {
133 dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
134 "config %d interface %d altsetting %d ep %d: "
136 usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
137 le16_to_cpu(desc->wBytesPerInterval),
138 cfgno, inum, asnum, ep->desc.bEndpointAddress,
140 ep->ss_ep_comp.wBytesPerInterval = cpu_to_le16(max_tx);
144 static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
145 int asnum, struct usb_host_interface *ifp, int num_ep,
146 unsigned char *buffer, int size)
148 unsigned char *buffer0 = buffer;
149 struct usb_endpoint_descriptor *d;
150 struct usb_host_endpoint *endpoint;
153 d = (struct usb_endpoint_descriptor *) buffer;
154 buffer += d->bLength;
157 if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
158 n = USB_DT_ENDPOINT_AUDIO_SIZE;
159 else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
160 n = USB_DT_ENDPOINT_SIZE;
162 dev_warn(ddev, "config %d interface %d altsetting %d has an "
163 "invalid endpoint descriptor of length %d, skipping\n",
164 cfgno, inum, asnum, d->bLength);
165 goto skip_to_next_endpoint_or_interface_descriptor;
168 i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK;
169 if (i >= 16 || i == 0) {
170 dev_warn(ddev, "config %d interface %d altsetting %d has an "
171 "invalid endpoint with address 0x%X, skipping\n",
172 cfgno, inum, asnum, d->bEndpointAddress);
173 goto skip_to_next_endpoint_or_interface_descriptor;
176 /* Only store as many endpoints as we have room for */
177 if (ifp->desc.bNumEndpoints >= num_ep)
178 goto skip_to_next_endpoint_or_interface_descriptor;
180 endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
181 ++ifp->desc.bNumEndpoints;
183 memcpy(&endpoint->desc, d, n);
184 INIT_LIST_HEAD(&endpoint->urb_list);
186 /* Fix up bInterval values outside the legal range. Use 32 ms if no
187 * proper value can be guessed. */
188 i = 0; /* i = min, j = max, n = default */
190 if (usb_endpoint_xfer_int(d)) {
192 switch (to_usb_device(ddev)->speed) {
193 case USB_SPEED_SUPER:
195 /* Many device manufacturers are using full-speed
196 * bInterval values in high-speed interrupt endpoint
197 * descriptors. Try to fix those and fall back to a
198 * 32 ms default value otherwise. */
199 n = fls(d->bInterval*8);
201 n = 9; /* 32 ms = 2^(9-1) uframes */
204 default: /* USB_SPEED_FULL or _LOW */
205 /* For low-speed, 10 ms is the official minimum.
206 * But some "overclocked" devices might want faster
207 * polling so we'll allow it. */
211 } else if (usb_endpoint_xfer_isoc(d)) {
214 switch (to_usb_device(ddev)->speed) {
216 n = 9; /* 32 ms = 2^(9-1) uframes */
218 default: /* USB_SPEED_FULL */
219 n = 6; /* 32 ms = 2^(6-1) frames */
223 if (d->bInterval < i || d->bInterval > j) {
224 dev_warn(ddev, "config %d interface %d altsetting %d "
225 "endpoint 0x%X has an invalid bInterval %d, "
228 d->bEndpointAddress, d->bInterval, n);
229 endpoint->desc.bInterval = n;
232 /* Some buggy low-speed devices have Bulk endpoints, which is
233 * explicitly forbidden by the USB spec. In an attempt to make
234 * them usable, we will try treating them as Interrupt endpoints.
236 if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
237 usb_endpoint_xfer_bulk(d)) {
238 dev_warn(ddev, "config %d interface %d altsetting %d "
239 "endpoint 0x%X is Bulk; changing to Interrupt\n",
240 cfgno, inum, asnum, d->bEndpointAddress);
241 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
242 endpoint->desc.bInterval = 1;
243 if (usb_endpoint_maxp(&endpoint->desc) > 8)
244 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
248 * Some buggy high speed devices have bulk endpoints using
249 * maxpacket sizes other than 512. High speed HCDs may not
250 * be able to handle that particular bug, so let's warn...
252 if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
253 && usb_endpoint_xfer_bulk(d)) {
256 maxp = usb_endpoint_maxp(&endpoint->desc) & 0x07ff;
258 dev_warn(ddev, "config %d interface %d altsetting %d "
259 "bulk endpoint 0x%X has invalid maxpacket %d\n",
260 cfgno, inum, asnum, d->bEndpointAddress,
264 /* Parse a possible SuperSpeed endpoint companion descriptor */
265 if (to_usb_device(ddev)->speed == USB_SPEED_SUPER)
266 usb_parse_ss_endpoint_companion(ddev, cfgno,
267 inum, asnum, endpoint, buffer, size);
269 /* Skip over any Class Specific or Vendor Specific descriptors;
270 * find the next endpoint or interface descriptor */
271 endpoint->extra = buffer;
272 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
273 USB_DT_INTERFACE, &n);
274 endpoint->extralen = i;
275 retval = buffer - buffer0 + i;
277 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
278 n, plural(n), "endpoint");
281 skip_to_next_endpoint_or_interface_descriptor:
282 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
283 USB_DT_INTERFACE, NULL);
284 return buffer - buffer0 + i;
287 void usb_release_interface_cache(struct kref *ref)
289 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
292 for (j = 0; j < intfc->num_altsetting; j++) {
293 struct usb_host_interface *alt = &intfc->altsetting[j];
295 kfree(alt->endpoint);
301 static int usb_parse_interface(struct device *ddev, int cfgno,
302 struct usb_host_config *config, unsigned char *buffer, int size,
303 u8 inums[], u8 nalts[])
305 unsigned char *buffer0 = buffer;
306 struct usb_interface_descriptor *d;
308 struct usb_interface_cache *intfc;
309 struct usb_host_interface *alt;
312 int num_ep, num_ep_orig;
314 d = (struct usb_interface_descriptor *) buffer;
315 buffer += d->bLength;
318 if (d->bLength < USB_DT_INTERFACE_SIZE)
319 goto skip_to_next_interface_descriptor;
321 /* Which interface entry is this? */
323 inum = d->bInterfaceNumber;
324 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
325 if (inums[i] == inum) {
326 intfc = config->intf_cache[i];
330 if (!intfc || intfc->num_altsetting >= nalts[i])
331 goto skip_to_next_interface_descriptor;
333 /* Check for duplicate altsetting entries */
334 asnum = d->bAlternateSetting;
335 for ((i = 0, alt = &intfc->altsetting[0]);
336 i < intfc->num_altsetting;
338 if (alt->desc.bAlternateSetting == asnum) {
339 dev_warn(ddev, "Duplicate descriptor for config %d "
340 "interface %d altsetting %d, skipping\n",
342 goto skip_to_next_interface_descriptor;
346 ++intfc->num_altsetting;
347 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
349 /* Skip over any Class Specific or Vendor Specific descriptors;
350 * find the first endpoint or interface descriptor */
352 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
353 USB_DT_INTERFACE, &n);
356 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
357 n, plural(n), "interface");
361 /* Allocate space for the right(?) number of endpoints */
362 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
363 alt->desc.bNumEndpoints = 0; /* Use as a counter */
364 if (num_ep > USB_MAXENDPOINTS) {
365 dev_warn(ddev, "too many endpoints for config %d interface %d "
366 "altsetting %d: %d, using maximum allowed: %d\n",
367 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
368 num_ep = USB_MAXENDPOINTS;
372 /* Can't allocate 0 bytes */
373 len = sizeof(struct usb_host_endpoint) * num_ep;
374 alt->endpoint = kzalloc(len, GFP_KERNEL);
379 /* Parse all the endpoint descriptors */
382 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
385 retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
386 num_ep, buffer, size);
395 if (n != num_ep_orig)
396 dev_warn(ddev, "config %d interface %d altsetting %d has %d "
397 "endpoint descriptor%s, different from the interface "
398 "descriptor's value: %d\n",
399 cfgno, inum, asnum, n, plural(n), num_ep_orig);
400 return buffer - buffer0;
402 skip_to_next_interface_descriptor:
403 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
404 USB_DT_INTERFACE, NULL);
405 return buffer - buffer0 + i;
408 static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
409 struct usb_host_config *config, unsigned char *buffer, int size)
411 struct device *ddev = &dev->dev;
412 unsigned char *buffer0 = buffer;
414 int nintf, nintf_orig;
416 struct usb_interface_cache *intfc;
417 unsigned char *buffer2;
419 struct usb_descriptor_header *header;
421 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
422 unsigned iad_num = 0;
424 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
425 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
426 config->desc.bLength < USB_DT_CONFIG_SIZE ||
427 config->desc.bLength > 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);
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 */
449 for ((buffer2 = buffer, size2 = size);
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));
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);
468 if (header->bDescriptorType == USB_DT_INTERFACE) {
469 struct usb_interface_descriptor *d;
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);
480 inum = d->bInterfaceNumber;
482 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
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);
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)
505 } else if (n < USB_MAXINTERFACES) {
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);
519 config->intf_assoc[iad_num] =
520 (struct usb_interface_assoc_descriptor
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);
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);
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) {
550 dev_warn(ddev, "config %d has no interface number "
554 /* Allocate the usb_interface_caches and altsetting arrays */
555 for (i = 0; i < nintf; ++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);
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;
581 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
582 n, plural(n), "configuration");
586 /* Parse all the interface/altsetting descriptors */
588 retval = usb_parse_interface(ddev, cfgno, config,
589 buffer, size, inums, nalts);
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)
606 if (n >= intfc->num_altsetting)
607 dev_warn(ddev, "config %d interface %d has no "
608 "altsetting %d\n", cfgno, inums[i], j);
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)
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];
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);
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 int usb_get_configuration(struct usb_device *dev)
656 struct device *ddev = &dev->dev;
657 int ncfg = dev->descriptor.bNumConfigurations;
659 unsigned int cfgno, length;
660 unsigned char *bigbuffer;
661 struct usb_config_descriptor *desc;
665 if (ncfg > USB_MAXCONFIG) {
666 dev_warn(ddev, "too many configurations: %d, "
667 "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
668 dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
672 dev_err(ddev, "no configurations\n");
676 length = ncfg * sizeof(struct usb_host_config);
677 dev->config = kzalloc(length, GFP_KERNEL);
681 length = ncfg * sizeof(char *);
682 dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
683 if (!dev->rawdescriptors)
686 desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
691 for (; cfgno < ncfg; cfgno++) {
692 /* We grab just the first descriptor so we know how long
693 * the whole configuration is */
694 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
695 desc, USB_DT_CONFIG_SIZE);
697 dev_err(ddev, "unable to read config index %d "
698 "descriptor/%s: %d\n", cfgno, "start", result);
699 if (result != -EPIPE)
701 dev_err(ddev, "chopping to %d config(s)\n", cfgno);
702 dev->descriptor.bNumConfigurations = cfgno;
704 } else if (result < 4) {
705 dev_err(ddev, "config index %d descriptor too short "
706 "(expected %i, got %i)\n", cfgno,
707 USB_DT_CONFIG_SIZE, result);
711 length = max((int) le16_to_cpu(desc->wTotalLength),
714 /* Now that we know the length, get the whole thing */
715 bigbuffer = kmalloc(length, GFP_KERNEL);
720 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
723 dev_err(ddev, "unable to read config index %d "
724 "descriptor/%s\n", cfgno, "all");
728 if (result < length) {
729 dev_warn(ddev, "config index %d descriptor too short "
730 "(expected %i, got %i)\n", cfgno, length, result);
734 dev->rawdescriptors[cfgno] = bigbuffer;
736 result = usb_parse_configuration(dev, cfgno,
737 &dev->config[cfgno], bigbuffer, length);
747 dev->descriptor.bNumConfigurations = cfgno;
749 if (result == -ENOMEM)
750 dev_err(ddev, "out of memory\n");
754 void usb_release_bos_descriptor(struct usb_device *dev)
757 kfree(dev->bos->desc);
763 /* Get BOS descriptor set */
764 int usb_get_bos_descriptor(struct usb_device *dev)
766 struct device *ddev = &dev->dev;
767 struct usb_bos_descriptor *bos;
768 struct usb_dev_cap_header *cap;
769 unsigned char *buffer;
770 int length, total_len, num, i;
773 bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
777 /* Get BOS descriptor */
778 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, bos, USB_DT_BOS_SIZE);
779 if (ret < USB_DT_BOS_SIZE) {
780 dev_err(ddev, "unable to get BOS descriptor\n");
787 length = bos->bLength;
788 total_len = le16_to_cpu(bos->wTotalLength);
789 num = bos->bNumDeviceCaps;
791 if (total_len < length)
794 dev->bos = kzalloc(sizeof(struct usb_host_bos), GFP_KERNEL);
798 /* Now let's get the whole BOS descriptor set */
799 buffer = kzalloc(total_len, GFP_KERNEL);
804 dev->bos->desc = (struct usb_bos_descriptor *)buffer;
806 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, buffer, total_len);
807 if (ret < total_len) {
808 dev_err(ddev, "unable to get BOS descriptor set\n");
815 for (i = 0; i < num; i++) {
817 cap = (struct usb_dev_cap_header *)buffer;
818 length = cap->bLength;
820 if (total_len < length)
824 if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
825 dev_warn(ddev, "descriptor type invalid, skip\n");
829 switch (cap->bDevCapabilityType) {
830 case USB_CAP_TYPE_WIRELESS_USB:
831 /* Wireless USB cap descriptor is handled by wusb */
833 case USB_CAP_TYPE_EXT:
835 (struct usb_ext_cap_descriptor *)buffer;
837 case USB_SS_CAP_TYPE:
839 (struct usb_ss_cap_descriptor *)buffer;
841 case CONTAINER_ID_TYPE:
843 (struct usb_ss_container_id_descriptor *)buffer;
853 usb_release_bos_descriptor(dev);