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 */
14 #define USB_MAXCONFIG 8 /* Arbitrary limit */
17 static inline const char *plural(int n)
19 return (n == 1 ? "" : "s");
22 static int find_next_descriptor(unsigned char *buffer, int size,
23 int dt1, int dt2, int *num_skipped)
25 struct usb_descriptor_header *h;
27 unsigned char *buffer0 = buffer;
29 /* Find the next descriptor of type dt1 or dt2 */
31 h = (struct usb_descriptor_header *) buffer;
32 if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
39 /* Store the number of descriptors skipped and return the
40 * number of bytes skipped */
43 return buffer - buffer0;
46 static void usb_parse_ssp_isoc_endpoint_companion(struct device *ddev,
47 int cfgno, int inum, int asnum, struct usb_host_endpoint *ep,
48 unsigned char *buffer, int size)
50 struct usb_ssp_isoc_ep_comp_descriptor *desc;
53 * The SuperSpeedPlus Isoc endpoint companion descriptor immediately
54 * follows the SuperSpeed Endpoint Companion descriptor
56 desc = (struct usb_ssp_isoc_ep_comp_descriptor *) buffer;
57 if (desc->bDescriptorType != USB_DT_SSP_ISOC_ENDPOINT_COMP ||
58 size < USB_DT_SSP_ISOC_EP_COMP_SIZE) {
59 dev_warn(ddev, "Invalid SuperSpeedPlus isoc endpoint companion"
60 "for config %d interface %d altsetting %d ep %d.\n",
61 cfgno, inum, asnum, ep->desc.bEndpointAddress);
64 memcpy(&ep->ssp_isoc_ep_comp, desc, USB_DT_SSP_ISOC_EP_COMP_SIZE);
67 static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
68 int inum, int asnum, struct usb_host_endpoint *ep,
69 unsigned char *buffer, int size)
71 struct usb_ss_ep_comp_descriptor *desc;
74 /* The SuperSpeed endpoint companion descriptor is supposed to
75 * be the first thing immediately following the endpoint descriptor.
77 desc = (struct usb_ss_ep_comp_descriptor *) buffer;
79 if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP ||
80 size < USB_DT_SS_EP_COMP_SIZE) {
81 dev_warn(ddev, "No SuperSpeed endpoint companion for config %d "
82 " interface %d altsetting %d ep %d: "
83 "using minimum values\n",
84 cfgno, inum, asnum, ep->desc.bEndpointAddress);
86 /* Fill in some default values.
87 * Leave bmAttributes as zero, which will mean no streams for
88 * bulk, and isoc won't support multiple bursts of packets.
89 * With bursts of only one packet, and a Mult of 1, the max
90 * amount of data moved per endpoint service interval is one
93 ep->ss_ep_comp.bLength = USB_DT_SS_EP_COMP_SIZE;
94 ep->ss_ep_comp.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
95 if (usb_endpoint_xfer_isoc(&ep->desc) ||
96 usb_endpoint_xfer_int(&ep->desc))
97 ep->ss_ep_comp.wBytesPerInterval =
98 ep->desc.wMaxPacketSize;
101 buffer += desc->bLength;
102 size -= desc->bLength;
103 memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE);
105 /* Check the various values */
106 if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) {
107 dev_warn(ddev, "Control endpoint with bMaxBurst = %d in "
108 "config %d interface %d altsetting %d ep %d: "
109 "setting to zero\n", desc->bMaxBurst,
110 cfgno, inum, asnum, ep->desc.bEndpointAddress);
111 ep->ss_ep_comp.bMaxBurst = 0;
112 } else if (desc->bMaxBurst > 15) {
113 dev_warn(ddev, "Endpoint with bMaxBurst = %d in "
114 "config %d interface %d altsetting %d ep %d: "
115 "setting to 15\n", desc->bMaxBurst,
116 cfgno, inum, asnum, ep->desc.bEndpointAddress);
117 ep->ss_ep_comp.bMaxBurst = 15;
120 if ((usb_endpoint_xfer_control(&ep->desc) ||
121 usb_endpoint_xfer_int(&ep->desc)) &&
122 desc->bmAttributes != 0) {
123 dev_warn(ddev, "%s endpoint with bmAttributes = %d in "
124 "config %d interface %d altsetting %d ep %d: "
126 usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
128 cfgno, inum, asnum, ep->desc.bEndpointAddress);
129 ep->ss_ep_comp.bmAttributes = 0;
130 } else if (usb_endpoint_xfer_bulk(&ep->desc) &&
131 desc->bmAttributes > 16) {
132 dev_warn(ddev, "Bulk endpoint with more than 65536 streams in "
133 "config %d interface %d altsetting %d ep %d: "
135 cfgno, inum, asnum, ep->desc.bEndpointAddress);
136 ep->ss_ep_comp.bmAttributes = 16;
137 } else if (usb_endpoint_xfer_isoc(&ep->desc) &&
138 !USB_SS_SSP_ISOC_COMP(desc->bmAttributes) &&
139 USB_SS_MULT(desc->bmAttributes) > 3) {
140 dev_warn(ddev, "Isoc endpoint has Mult of %d in "
141 "config %d interface %d altsetting %d ep %d: "
143 USB_SS_MULT(desc->bmAttributes),
144 cfgno, inum, asnum, ep->desc.bEndpointAddress);
145 ep->ss_ep_comp.bmAttributes = 2;
148 if (usb_endpoint_xfer_isoc(&ep->desc))
149 max_tx = (desc->bMaxBurst + 1) *
150 (USB_SS_MULT(desc->bmAttributes)) *
151 usb_endpoint_maxp(&ep->desc);
152 else if (usb_endpoint_xfer_int(&ep->desc))
153 max_tx = usb_endpoint_maxp(&ep->desc) *
154 (desc->bMaxBurst + 1);
157 if (le16_to_cpu(desc->wBytesPerInterval) > max_tx) {
158 dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
159 "config %d interface %d altsetting %d ep %d: "
161 usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
162 le16_to_cpu(desc->wBytesPerInterval),
163 cfgno, inum, asnum, ep->desc.bEndpointAddress,
165 ep->ss_ep_comp.wBytesPerInterval = cpu_to_le16(max_tx);
167 /* Parse a possible SuperSpeedPlus isoc ep companion descriptor */
168 if (usb_endpoint_xfer_isoc(&ep->desc) &&
169 USB_SS_SSP_ISOC_COMP(desc->bmAttributes))
170 usb_parse_ssp_isoc_endpoint_companion(ddev, cfgno, inum, asnum,
174 static const unsigned short low_speed_maxpacket_maxes[4] = {
175 [USB_ENDPOINT_XFER_CONTROL] = 8,
176 [USB_ENDPOINT_XFER_ISOC] = 0,
177 [USB_ENDPOINT_XFER_BULK] = 0,
178 [USB_ENDPOINT_XFER_INT] = 8,
180 static const unsigned short full_speed_maxpacket_maxes[4] = {
181 [USB_ENDPOINT_XFER_CONTROL] = 64,
182 [USB_ENDPOINT_XFER_ISOC] = 1023,
183 [USB_ENDPOINT_XFER_BULK] = 64,
184 [USB_ENDPOINT_XFER_INT] = 64,
186 static const unsigned short high_speed_maxpacket_maxes[4] = {
187 [USB_ENDPOINT_XFER_CONTROL] = 64,
188 [USB_ENDPOINT_XFER_ISOC] = 1024,
189 [USB_ENDPOINT_XFER_BULK] = 512,
190 [USB_ENDPOINT_XFER_INT] = 1023,
192 static const unsigned short super_speed_maxpacket_maxes[4] = {
193 [USB_ENDPOINT_XFER_CONTROL] = 512,
194 [USB_ENDPOINT_XFER_ISOC] = 1024,
195 [USB_ENDPOINT_XFER_BULK] = 1024,
196 [USB_ENDPOINT_XFER_INT] = 1024,
199 static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
200 int asnum, struct usb_host_interface *ifp, int num_ep,
201 unsigned char *buffer, int size)
203 unsigned char *buffer0 = buffer;
204 struct usb_endpoint_descriptor *d;
205 struct usb_host_endpoint *endpoint;
208 const unsigned short *maxpacket_maxes;
210 d = (struct usb_endpoint_descriptor *) buffer;
211 buffer += d->bLength;
214 if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
215 n = USB_DT_ENDPOINT_AUDIO_SIZE;
216 else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
217 n = USB_DT_ENDPOINT_SIZE;
219 dev_warn(ddev, "config %d interface %d altsetting %d has an "
220 "invalid endpoint descriptor of length %d, skipping\n",
221 cfgno, inum, asnum, d->bLength);
222 goto skip_to_next_endpoint_or_interface_descriptor;
225 i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK;
226 if (i >= 16 || i == 0) {
227 dev_warn(ddev, "config %d interface %d altsetting %d has an "
228 "invalid endpoint with address 0x%X, skipping\n",
229 cfgno, inum, asnum, d->bEndpointAddress);
230 goto skip_to_next_endpoint_or_interface_descriptor;
233 /* Only store as many endpoints as we have room for */
234 if (ifp->desc.bNumEndpoints >= num_ep)
235 goto skip_to_next_endpoint_or_interface_descriptor;
237 endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
238 ++ifp->desc.bNumEndpoints;
240 memcpy(&endpoint->desc, d, n);
241 INIT_LIST_HEAD(&endpoint->urb_list);
243 /* Fix up bInterval values outside the legal range. Use 32 ms if no
244 * proper value can be guessed. */
245 i = 0; /* i = min, j = max, n = default */
247 if (usb_endpoint_xfer_int(d)) {
249 switch (to_usb_device(ddev)->speed) {
250 case USB_SPEED_SUPER_PLUS:
251 case USB_SPEED_SUPER:
253 /* Many device manufacturers are using full-speed
254 * bInterval values in high-speed interrupt endpoint
255 * descriptors. Try to fix those and fall back to a
256 * 32 ms default value otherwise. */
257 n = fls(d->bInterval*8);
259 n = 9; /* 32 ms = 2^(9-1) uframes */
263 * Adjust bInterval for quirked devices.
264 * This quirk fixes bIntervals reported in
265 * linear microframes.
267 if (to_usb_device(ddev)->quirks &
268 USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL) {
269 n = clamp(fls(d->bInterval), i, j);
273 default: /* USB_SPEED_FULL or _LOW */
274 /* For low-speed, 10 ms is the official minimum.
275 * But some "overclocked" devices might want faster
276 * polling so we'll allow it. */
280 } else if (usb_endpoint_xfer_isoc(d)) {
283 switch (to_usb_device(ddev)->speed) {
285 n = 9; /* 32 ms = 2^(9-1) uframes */
287 default: /* USB_SPEED_FULL */
288 n = 6; /* 32 ms = 2^(6-1) frames */
292 if (d->bInterval < i || d->bInterval > j) {
293 dev_warn(ddev, "config %d interface %d altsetting %d "
294 "endpoint 0x%X has an invalid bInterval %d, "
297 d->bEndpointAddress, d->bInterval, n);
298 endpoint->desc.bInterval = n;
301 /* Some buggy low-speed devices have Bulk endpoints, which is
302 * explicitly forbidden by the USB spec. In an attempt to make
303 * them usable, we will try treating them as Interrupt endpoints.
305 if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
306 usb_endpoint_xfer_bulk(d)) {
307 dev_warn(ddev, "config %d interface %d altsetting %d "
308 "endpoint 0x%X is Bulk; changing to Interrupt\n",
309 cfgno, inum, asnum, d->bEndpointAddress);
310 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
311 endpoint->desc.bInterval = 1;
312 if (usb_endpoint_maxp(&endpoint->desc) > 8)
313 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
316 /* Validate the wMaxPacketSize field */
317 maxp = usb_endpoint_maxp(&endpoint->desc);
319 /* Find the highest legal maxpacket size for this endpoint */
320 i = 0; /* additional transactions per microframe */
321 switch (to_usb_device(ddev)->speed) {
323 maxpacket_maxes = low_speed_maxpacket_maxes;
326 maxpacket_maxes = full_speed_maxpacket_maxes;
329 /* Bits 12..11 are allowed only for HS periodic endpoints */
330 if (usb_endpoint_xfer_int(d) || usb_endpoint_xfer_isoc(d)) {
331 i = maxp & (BIT(12) | BIT(11));
336 maxpacket_maxes = high_speed_maxpacket_maxes;
338 case USB_SPEED_SUPER:
339 case USB_SPEED_SUPER_PLUS:
340 maxpacket_maxes = super_speed_maxpacket_maxes;
343 j = maxpacket_maxes[usb_endpoint_type(&endpoint->desc)];
346 dev_warn(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid maxpacket %d, setting to %d\n",
347 cfgno, inum, asnum, d->bEndpointAddress, maxp, j);
349 endpoint->desc.wMaxPacketSize = cpu_to_le16(i | maxp);
353 * Some buggy high speed devices have bulk endpoints using
354 * maxpacket sizes other than 512. High speed HCDs may not
355 * be able to handle that particular bug, so let's warn...
357 if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
358 && usb_endpoint_xfer_bulk(d)) {
360 dev_warn(ddev, "config %d interface %d altsetting %d "
361 "bulk endpoint 0x%X has invalid maxpacket %d\n",
362 cfgno, inum, asnum, d->bEndpointAddress,
366 /* Parse a possible SuperSpeed endpoint companion descriptor */
367 if (to_usb_device(ddev)->speed >= USB_SPEED_SUPER)
368 usb_parse_ss_endpoint_companion(ddev, cfgno,
369 inum, asnum, endpoint, buffer, size);
371 /* Skip over any Class Specific or Vendor Specific descriptors;
372 * find the next endpoint or interface descriptor */
373 endpoint->extra = buffer;
374 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
375 USB_DT_INTERFACE, &n);
376 endpoint->extralen = i;
377 retval = buffer - buffer0 + i;
379 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
380 n, plural(n), "endpoint");
383 skip_to_next_endpoint_or_interface_descriptor:
384 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
385 USB_DT_INTERFACE, NULL);
386 return buffer - buffer0 + i;
389 void usb_release_interface_cache(struct kref *ref)
391 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
394 for (j = 0; j < intfc->num_altsetting; j++) {
395 struct usb_host_interface *alt = &intfc->altsetting[j];
397 kfree(alt->endpoint);
403 static int usb_parse_interface(struct device *ddev, int cfgno,
404 struct usb_host_config *config, unsigned char *buffer, int size,
405 u8 inums[], u8 nalts[])
407 unsigned char *buffer0 = buffer;
408 struct usb_interface_descriptor *d;
410 struct usb_interface_cache *intfc;
411 struct usb_host_interface *alt;
414 int num_ep, num_ep_orig;
416 d = (struct usb_interface_descriptor *) buffer;
417 buffer += d->bLength;
420 if (d->bLength < USB_DT_INTERFACE_SIZE)
421 goto skip_to_next_interface_descriptor;
423 /* Which interface entry is this? */
425 inum = d->bInterfaceNumber;
426 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
427 if (inums[i] == inum) {
428 intfc = config->intf_cache[i];
432 if (!intfc || intfc->num_altsetting >= nalts[i])
433 goto skip_to_next_interface_descriptor;
435 /* Check for duplicate altsetting entries */
436 asnum = d->bAlternateSetting;
437 for ((i = 0, alt = &intfc->altsetting[0]);
438 i < intfc->num_altsetting;
440 if (alt->desc.bAlternateSetting == asnum) {
441 dev_warn(ddev, "Duplicate descriptor for config %d "
442 "interface %d altsetting %d, skipping\n",
444 goto skip_to_next_interface_descriptor;
448 ++intfc->num_altsetting;
449 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
451 /* Skip over any Class Specific or Vendor Specific descriptors;
452 * find the first endpoint or interface descriptor */
454 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
455 USB_DT_INTERFACE, &n);
458 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
459 n, plural(n), "interface");
463 /* Allocate space for the right(?) number of endpoints */
464 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
465 alt->desc.bNumEndpoints = 0; /* Use as a counter */
466 if (num_ep > USB_MAXENDPOINTS) {
467 dev_warn(ddev, "too many endpoints for config %d interface %d "
468 "altsetting %d: %d, using maximum allowed: %d\n",
469 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
470 num_ep = USB_MAXENDPOINTS;
474 /* Can't allocate 0 bytes */
475 len = sizeof(struct usb_host_endpoint) * num_ep;
476 alt->endpoint = kzalloc(len, GFP_KERNEL);
481 /* Parse all the endpoint descriptors */
484 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
487 retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
488 num_ep, buffer, size);
497 if (n != num_ep_orig)
498 dev_warn(ddev, "config %d interface %d altsetting %d has %d "
499 "endpoint descriptor%s, different from the interface "
500 "descriptor's value: %d\n",
501 cfgno, inum, asnum, n, plural(n), num_ep_orig);
502 return buffer - buffer0;
504 skip_to_next_interface_descriptor:
505 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
506 USB_DT_INTERFACE, NULL);
507 return buffer - buffer0 + i;
510 static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
511 struct usb_host_config *config, unsigned char *buffer, int size)
513 struct device *ddev = &dev->dev;
514 unsigned char *buffer0 = buffer;
516 int nintf, nintf_orig;
518 struct usb_interface_cache *intfc;
519 unsigned char *buffer2;
521 struct usb_descriptor_header *header;
523 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
524 unsigned iad_num = 0;
526 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
527 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
528 config->desc.bLength < USB_DT_CONFIG_SIZE ||
529 config->desc.bLength > size) {
530 dev_err(ddev, "invalid descriptor for config index %d: "
531 "type = 0x%X, length = %d\n", cfgidx,
532 config->desc.bDescriptorType, config->desc.bLength);
535 cfgno = config->desc.bConfigurationValue;
537 buffer += config->desc.bLength;
538 size -= config->desc.bLength;
540 nintf = nintf_orig = config->desc.bNumInterfaces;
541 if (nintf > USB_MAXINTERFACES) {
542 dev_warn(ddev, "config %d has too many interfaces: %d, "
543 "using maximum allowed: %d\n",
544 cfgno, nintf, USB_MAXINTERFACES);
545 nintf = USB_MAXINTERFACES;
548 /* Go through the descriptors, checking their length and counting the
549 * number of altsettings for each interface */
551 for ((buffer2 = buffer, size2 = size);
553 (buffer2 += header->bLength, size2 -= header->bLength)) {
555 if (size2 < sizeof(struct usb_descriptor_header)) {
556 dev_warn(ddev, "config %d descriptor has %d excess "
557 "byte%s, ignoring\n",
558 cfgno, size2, plural(size2));
562 header = (struct usb_descriptor_header *) buffer2;
563 if ((header->bLength > size2) || (header->bLength < 2)) {
564 dev_warn(ddev, "config %d has an invalid descriptor "
565 "of length %d, skipping remainder of the config\n",
566 cfgno, header->bLength);
570 if (header->bDescriptorType == USB_DT_INTERFACE) {
571 struct usb_interface_descriptor *d;
574 d = (struct usb_interface_descriptor *) header;
575 if (d->bLength < USB_DT_INTERFACE_SIZE) {
576 dev_warn(ddev, "config %d has an invalid "
577 "interface descriptor of length %d, "
578 "skipping\n", cfgno, d->bLength);
582 inum = d->bInterfaceNumber;
584 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
586 dev_warn(ddev, "config %d has more interface "
587 "descriptors, than it declares in "
588 "bNumInterfaces, ignoring interface "
589 "number: %d\n", cfgno, inum);
593 if (inum >= nintf_orig)
594 dev_warn(ddev, "config %d has an invalid "
595 "interface number: %d but max is %d\n",
596 cfgno, inum, nintf_orig - 1);
598 /* Have we already encountered this interface?
599 * Count its altsettings */
600 for (i = 0; i < n; ++i) {
601 if (inums[i] == inum)
607 } else if (n < USB_MAXINTERFACES) {
613 } else if (header->bDescriptorType ==
614 USB_DT_INTERFACE_ASSOCIATION) {
615 if (iad_num == USB_MAXIADS) {
616 dev_warn(ddev, "found more Interface "
617 "Association Descriptors "
618 "than allocated for in "
619 "configuration %d\n", cfgno);
621 config->intf_assoc[iad_num] =
622 (struct usb_interface_assoc_descriptor
627 } else if (header->bDescriptorType == USB_DT_DEVICE ||
628 header->bDescriptorType == USB_DT_CONFIG)
629 dev_warn(ddev, "config %d contains an unexpected "
630 "descriptor of type 0x%X, skipping\n",
631 cfgno, header->bDescriptorType);
633 } /* for ((buffer2 = buffer, size2 = size); ...) */
634 size = buffer2 - buffer;
635 config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
638 dev_warn(ddev, "config %d has %d interface%s, different from "
639 "the descriptor's value: %d\n",
640 cfgno, n, plural(n), nintf_orig);
642 dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
643 config->desc.bNumInterfaces = nintf = n;
645 /* Check for missing interface numbers */
646 for (i = 0; i < nintf; ++i) {
647 for (j = 0; j < nintf; ++j) {
652 dev_warn(ddev, "config %d has no interface number "
656 /* Allocate the usb_interface_caches and altsetting arrays */
657 for (i = 0; i < nintf; ++i) {
659 if (j > USB_MAXALTSETTING) {
660 dev_warn(ddev, "too many alternate settings for "
661 "config %d interface %d: %d, "
662 "using maximum allowed: %d\n",
663 cfgno, inums[i], j, USB_MAXALTSETTING);
664 nalts[i] = j = USB_MAXALTSETTING;
667 len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
668 config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
671 kref_init(&intfc->ref);
674 /* FIXME: parse the BOS descriptor */
676 /* Skip over any Class Specific or Vendor Specific descriptors;
677 * find the first interface descriptor */
678 config->extra = buffer;
679 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
680 USB_DT_INTERFACE, &n);
681 config->extralen = i;
683 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
684 n, plural(n), "configuration");
688 /* Parse all the interface/altsetting descriptors */
690 retval = usb_parse_interface(ddev, cfgno, config,
691 buffer, size, inums, nalts);
699 /* Check for missing altsettings */
700 for (i = 0; i < nintf; ++i) {
701 intfc = config->intf_cache[i];
702 for (j = 0; j < intfc->num_altsetting; ++j) {
703 for (n = 0; n < intfc->num_altsetting; ++n) {
704 if (intfc->altsetting[n].desc.
705 bAlternateSetting == j)
708 if (n >= intfc->num_altsetting)
709 dev_warn(ddev, "config %d interface %d has no "
710 "altsetting %d\n", cfgno, inums[i], j);
717 /* hub-only!! ... and only exported for reset/reinit path.
718 * otherwise used internally on disconnect/destroy path
720 void usb_destroy_configuration(struct usb_device *dev)
727 if (dev->rawdescriptors) {
728 for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
729 kfree(dev->rawdescriptors[i]);
731 kfree(dev->rawdescriptors);
732 dev->rawdescriptors = NULL;
735 for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
736 struct usb_host_config *cf = &dev->config[c];
739 for (i = 0; i < cf->desc.bNumInterfaces; i++) {
740 if (cf->intf_cache[i])
741 kref_put(&cf->intf_cache[i]->ref,
742 usb_release_interface_cache);
751 * Get the USB config descriptors, cache and parse'em
753 * hub-only!! ... and only in reset path, or usb_new_device()
754 * (used by real hubs and virtual root hubs)
756 int usb_get_configuration(struct usb_device *dev)
758 struct device *ddev = &dev->dev;
759 int ncfg = dev->descriptor.bNumConfigurations;
761 unsigned int cfgno, length;
762 unsigned char *bigbuffer;
763 struct usb_config_descriptor *desc;
767 if (ncfg > USB_MAXCONFIG) {
768 dev_warn(ddev, "too many configurations: %d, "
769 "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
770 dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
774 dev_err(ddev, "no configurations\n");
778 length = ncfg * sizeof(struct usb_host_config);
779 dev->config = kzalloc(length, GFP_KERNEL);
783 length = ncfg * sizeof(char *);
784 dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
785 if (!dev->rawdescriptors)
788 desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
793 for (; cfgno < ncfg; cfgno++) {
794 /* We grab just the first descriptor so we know how long
795 * the whole configuration is */
796 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
797 desc, USB_DT_CONFIG_SIZE);
799 dev_err(ddev, "unable to read config index %d "
800 "descriptor/%s: %d\n", cfgno, "start", result);
801 if (result != -EPIPE)
803 dev_err(ddev, "chopping to %d config(s)\n", cfgno);
804 dev->descriptor.bNumConfigurations = cfgno;
806 } else if (result < 4) {
807 dev_err(ddev, "config index %d descriptor too short "
808 "(expected %i, got %i)\n", cfgno,
809 USB_DT_CONFIG_SIZE, result);
813 length = max((int) le16_to_cpu(desc->wTotalLength),
816 /* Now that we know the length, get the whole thing */
817 bigbuffer = kmalloc(length, GFP_KERNEL);
823 if (dev->quirks & USB_QUIRK_DELAY_INIT)
826 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
829 dev_err(ddev, "unable to read config index %d "
830 "descriptor/%s\n", cfgno, "all");
834 if (result < length) {
835 dev_warn(ddev, "config index %d descriptor too short "
836 "(expected %i, got %i)\n", cfgno, length, result);
840 dev->rawdescriptors[cfgno] = bigbuffer;
842 result = usb_parse_configuration(dev, cfgno,
843 &dev->config[cfgno], bigbuffer, length);
853 dev->descriptor.bNumConfigurations = cfgno;
855 if (result == -ENOMEM)
856 dev_err(ddev, "out of memory\n");
860 void usb_release_bos_descriptor(struct usb_device *dev)
863 kfree(dev->bos->desc);
869 /* Get BOS descriptor set */
870 int usb_get_bos_descriptor(struct usb_device *dev)
872 struct device *ddev = &dev->dev;
873 struct usb_bos_descriptor *bos;
874 struct usb_dev_cap_header *cap;
875 unsigned char *buffer;
876 int length, total_len, num, i;
879 bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
883 /* Get BOS descriptor */
884 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, bos, USB_DT_BOS_SIZE);
885 if (ret < USB_DT_BOS_SIZE) {
886 dev_err(ddev, "unable to get BOS descriptor\n");
893 length = bos->bLength;
894 total_len = le16_to_cpu(bos->wTotalLength);
895 num = bos->bNumDeviceCaps;
897 if (total_len < length)
900 dev->bos = kzalloc(sizeof(struct usb_host_bos), GFP_KERNEL);
904 /* Now let's get the whole BOS descriptor set */
905 buffer = kzalloc(total_len, GFP_KERNEL);
910 dev->bos->desc = (struct usb_bos_descriptor *)buffer;
912 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, buffer, total_len);
913 if (ret < total_len) {
914 dev_err(ddev, "unable to get BOS descriptor set\n");
921 for (i = 0; i < num; i++) {
923 cap = (struct usb_dev_cap_header *)buffer;
924 length = cap->bLength;
926 if (total_len < length)
930 if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
931 dev_warn(ddev, "descriptor type invalid, skip\n");
935 switch (cap->bDevCapabilityType) {
936 case USB_CAP_TYPE_WIRELESS_USB:
937 /* Wireless USB cap descriptor is handled by wusb */
939 case USB_CAP_TYPE_EXT:
941 (struct usb_ext_cap_descriptor *)buffer;
943 case USB_SS_CAP_TYPE:
945 (struct usb_ss_cap_descriptor *)buffer;
947 case USB_SSP_CAP_TYPE:
949 (struct usb_ssp_cap_descriptor *)buffer;
951 case CONTAINER_ID_TYPE:
953 (struct usb_ss_container_id_descriptor *)buffer;
955 case USB_PTM_CAP_TYPE:
957 (struct usb_ptm_cap_descriptor *)buffer;
966 usb_release_bos_descriptor(dev);