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>
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;
29 unsigned char *buffer0 = buffer;
31 /* Find the next descriptor of type dt1 or dt2 */
33 h = (struct usb_descriptor_header *) buffer;
34 if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
41 /* Store the number of descriptors skipped and return the
42 * number of bytes skipped */
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;
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
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;
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: "
105 usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
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: "
114 cfgno, inum, asnum, ep->desc.bEndpointAddress);
115 ep->ss_ep_comp.bmAttributes = 16;
116 } else if (usb_endpoint_xfer_isoc(&ep->desc) &&
117 USB_SS_MULT(desc->bmAttributes) > 3) {
118 dev_warn(ddev, "Isoc endpoint has Mult of %d in "
119 "config %d interface %d altsetting %d ep %d: "
121 USB_SS_MULT(desc->bmAttributes),
122 cfgno, inum, asnum, ep->desc.bEndpointAddress);
123 ep->ss_ep_comp.bmAttributes = 2;
126 if (usb_endpoint_xfer_isoc(&ep->desc))
127 max_tx = (desc->bMaxBurst + 1) *
128 (USB_SS_MULT(desc->bmAttributes)) *
129 usb_endpoint_maxp(&ep->desc);
130 else if (usb_endpoint_xfer_int(&ep->desc))
131 max_tx = usb_endpoint_maxp(&ep->desc) *
132 (desc->bMaxBurst + 1);
135 if (le16_to_cpu(desc->wBytesPerInterval) > max_tx) {
136 dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
137 "config %d interface %d altsetting %d ep %d: "
139 usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
140 le16_to_cpu(desc->wBytesPerInterval),
141 cfgno, inum, asnum, ep->desc.bEndpointAddress,
143 ep->ss_ep_comp.wBytesPerInterval = cpu_to_le16(max_tx);
147 static const unsigned short low_speed_maxpacket_maxes[4] = {
148 [USB_ENDPOINT_XFER_CONTROL] = 8,
149 [USB_ENDPOINT_XFER_ISOC] = 0,
150 [USB_ENDPOINT_XFER_BULK] = 0,
151 [USB_ENDPOINT_XFER_INT] = 8,
153 static const unsigned short full_speed_maxpacket_maxes[4] = {
154 [USB_ENDPOINT_XFER_CONTROL] = 64,
155 [USB_ENDPOINT_XFER_ISOC] = 1023,
156 [USB_ENDPOINT_XFER_BULK] = 64,
157 [USB_ENDPOINT_XFER_INT] = 64,
159 static const unsigned short high_speed_maxpacket_maxes[4] = {
160 [USB_ENDPOINT_XFER_CONTROL] = 64,
161 [USB_ENDPOINT_XFER_ISOC] = 1024,
162 [USB_ENDPOINT_XFER_BULK] = 512,
163 [USB_ENDPOINT_XFER_INT] = 1024,
165 static const unsigned short super_speed_maxpacket_maxes[4] = {
166 [USB_ENDPOINT_XFER_CONTROL] = 512,
167 [USB_ENDPOINT_XFER_ISOC] = 1024,
168 [USB_ENDPOINT_XFER_BULK] = 1024,
169 [USB_ENDPOINT_XFER_INT] = 1024,
172 static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
173 int asnum, struct usb_host_interface *ifp, int num_ep,
174 unsigned char *buffer, int size)
176 unsigned char *buffer0 = buffer;
177 struct usb_endpoint_descriptor *d;
178 struct usb_host_endpoint *endpoint;
181 const unsigned short *maxpacket_maxes;
183 d = (struct usb_endpoint_descriptor *) buffer;
184 buffer += d->bLength;
187 if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
188 n = USB_DT_ENDPOINT_AUDIO_SIZE;
189 else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
190 n = USB_DT_ENDPOINT_SIZE;
192 dev_warn(ddev, "config %d interface %d altsetting %d has an "
193 "invalid endpoint descriptor of length %d, skipping\n",
194 cfgno, inum, asnum, d->bLength);
195 goto skip_to_next_endpoint_or_interface_descriptor;
198 i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK;
199 if (i >= 16 || i == 0) {
200 dev_warn(ddev, "config %d interface %d altsetting %d has an "
201 "invalid endpoint with address 0x%X, skipping\n",
202 cfgno, inum, asnum, d->bEndpointAddress);
203 goto skip_to_next_endpoint_or_interface_descriptor;
206 /* Only store as many endpoints as we have room for */
207 if (ifp->desc.bNumEndpoints >= num_ep)
208 goto skip_to_next_endpoint_or_interface_descriptor;
210 /* Check for duplicate endpoint addresses */
211 for (i = 0; i < ifp->desc.bNumEndpoints; ++i) {
212 if (ifp->endpoint[i].desc.bEndpointAddress ==
213 d->bEndpointAddress) {
214 dev_warn(ddev, "config %d interface %d altsetting %d has a duplicate endpoint with address 0x%X, skipping\n",
215 cfgno, inum, asnum, d->bEndpointAddress);
216 goto skip_to_next_endpoint_or_interface_descriptor;
220 endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
221 ++ifp->desc.bNumEndpoints;
223 memcpy(&endpoint->desc, d, n);
224 INIT_LIST_HEAD(&endpoint->urb_list);
227 * Fix up bInterval values outside the legal range.
228 * Use 10 or 8 ms if no proper value can be guessed.
230 i = 0; /* i = min, j = max, n = default */
232 if (usb_endpoint_xfer_int(d)) {
234 switch (to_usb_device(ddev)->speed) {
235 case USB_SPEED_SUPER:
238 * Many device manufacturers are using full-speed
239 * bInterval values in high-speed interrupt endpoint
240 * descriptors. Try to fix those and fall back to an
241 * 8-ms default value otherwise.
243 n = fls(d->bInterval*8);
245 n = 7; /* 8 ms = 2^(7-1) uframes */
249 * Adjust bInterval for quirked devices.
252 * This quirk fixes bIntervals reported in ms.
254 if (to_usb_device(ddev)->quirks &
255 USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL) {
256 n = clamp(fls(d->bInterval) + 3, i, j);
260 * This quirk fixes bIntervals reported in
261 * linear microframes.
263 if (to_usb_device(ddev)->quirks &
264 USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL) {
265 n = clamp(fls(d->bInterval), i, j);
269 default: /* USB_SPEED_FULL or _LOW */
271 * For low-speed, 10 ms is the official minimum.
272 * But some "overclocked" devices might want faster
273 * polling so we'll allow it.
278 } else if (usb_endpoint_xfer_isoc(d)) {
281 switch (to_usb_device(ddev)->speed) {
283 n = 7; /* 8 ms = 2^(7-1) uframes */
285 default: /* USB_SPEED_FULL */
286 n = 4; /* 8 ms = 2^(4-1) frames */
290 if (d->bInterval < i || d->bInterval > j) {
291 dev_warn(ddev, "config %d interface %d altsetting %d "
292 "endpoint 0x%X has an invalid bInterval %d, "
295 d->bEndpointAddress, d->bInterval, n);
296 endpoint->desc.bInterval = n;
299 /* Some buggy low-speed devices have Bulk endpoints, which is
300 * explicitly forbidden by the USB spec. In an attempt to make
301 * them usable, we will try treating them as Interrupt endpoints.
303 if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
304 usb_endpoint_xfer_bulk(d)) {
305 dev_warn(ddev, "config %d interface %d altsetting %d "
306 "endpoint 0x%X is Bulk; changing to Interrupt\n",
307 cfgno, inum, asnum, d->bEndpointAddress);
308 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
309 endpoint->desc.bInterval = 1;
310 if (usb_endpoint_maxp(&endpoint->desc) > 8)
311 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
314 /* Validate the wMaxPacketSize field */
315 maxp = usb_endpoint_maxp(&endpoint->desc);
317 /* Find the highest legal maxpacket size for this endpoint */
318 i = 0; /* additional transactions per microframe */
319 switch (to_usb_device(ddev)->speed) {
321 maxpacket_maxes = low_speed_maxpacket_maxes;
324 maxpacket_maxes = full_speed_maxpacket_maxes;
327 /* Bits 12..11 are allowed only for HS periodic endpoints */
328 if (usb_endpoint_xfer_int(d) || usb_endpoint_xfer_isoc(d)) {
329 i = maxp & (BIT(12) | BIT(11));
334 maxpacket_maxes = high_speed_maxpacket_maxes;
336 case USB_SPEED_SUPER:
337 maxpacket_maxes = super_speed_maxpacket_maxes;
340 j = maxpacket_maxes[usb_endpoint_type(&endpoint->desc)];
343 dev_warn(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid maxpacket %d, setting to %d\n",
344 cfgno, inum, asnum, d->bEndpointAddress, maxp, j);
346 endpoint->desc.wMaxPacketSize = cpu_to_le16(i | maxp);
350 * Some buggy high speed devices have bulk endpoints using
351 * maxpacket sizes other than 512. High speed HCDs may not
352 * be able to handle that particular bug, so let's warn...
354 if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
355 && usb_endpoint_xfer_bulk(d)) {
357 dev_warn(ddev, "config %d interface %d altsetting %d "
358 "bulk endpoint 0x%X has invalid maxpacket %d\n",
359 cfgno, inum, asnum, d->bEndpointAddress,
363 /* Parse a possible SuperSpeed endpoint companion descriptor */
364 if (to_usb_device(ddev)->speed == USB_SPEED_SUPER)
365 usb_parse_ss_endpoint_companion(ddev, cfgno,
366 inum, asnum, endpoint, buffer, size);
368 /* Skip over any Class Specific or Vendor Specific descriptors;
369 * find the next endpoint or interface descriptor */
370 endpoint->extra = buffer;
371 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
372 USB_DT_INTERFACE, &n);
373 endpoint->extralen = i;
374 retval = buffer - buffer0 + i;
376 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
377 n, plural(n), "endpoint");
380 skip_to_next_endpoint_or_interface_descriptor:
381 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
382 USB_DT_INTERFACE, NULL);
383 return buffer - buffer0 + i;
386 void usb_release_interface_cache(struct kref *ref)
388 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
391 for (j = 0; j < intfc->num_altsetting; j++) {
392 struct usb_host_interface *alt = &intfc->altsetting[j];
394 kfree(alt->endpoint);
400 static int usb_parse_interface(struct device *ddev, int cfgno,
401 struct usb_host_config *config, unsigned char *buffer, int size,
402 u8 inums[], u8 nalts[])
404 unsigned char *buffer0 = buffer;
405 struct usb_interface_descriptor *d;
407 struct usb_interface_cache *intfc;
408 struct usb_host_interface *alt;
411 int num_ep, num_ep_orig;
413 d = (struct usb_interface_descriptor *) buffer;
414 buffer += d->bLength;
417 if (d->bLength < USB_DT_INTERFACE_SIZE)
418 goto skip_to_next_interface_descriptor;
420 /* Which interface entry is this? */
422 inum = d->bInterfaceNumber;
423 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
424 if (inums[i] == inum) {
425 intfc = config->intf_cache[i];
429 if (!intfc || intfc->num_altsetting >= nalts[i])
430 goto skip_to_next_interface_descriptor;
432 /* Check for duplicate altsetting entries */
433 asnum = d->bAlternateSetting;
434 for ((i = 0, alt = &intfc->altsetting[0]);
435 i < intfc->num_altsetting;
437 if (alt->desc.bAlternateSetting == asnum) {
438 dev_warn(ddev, "Duplicate descriptor for config %d "
439 "interface %d altsetting %d, skipping\n",
441 goto skip_to_next_interface_descriptor;
445 ++intfc->num_altsetting;
446 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
448 /* Skip over any Class Specific or Vendor Specific descriptors;
449 * find the first endpoint or interface descriptor */
451 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
452 USB_DT_INTERFACE, &n);
455 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
456 n, plural(n), "interface");
460 /* Allocate space for the right(?) number of endpoints */
461 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
462 alt->desc.bNumEndpoints = 0; /* Use as a counter */
463 if (num_ep > USB_MAXENDPOINTS) {
464 dev_warn(ddev, "too many endpoints for config %d interface %d "
465 "altsetting %d: %d, using maximum allowed: %d\n",
466 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
467 num_ep = USB_MAXENDPOINTS;
471 /* Can't allocate 0 bytes */
472 len = sizeof(struct usb_host_endpoint) * num_ep;
473 alt->endpoint = kzalloc(len, GFP_KERNEL);
478 /* Parse all the endpoint descriptors */
481 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
484 retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
485 num_ep, buffer, size);
494 if (n != num_ep_orig)
495 dev_warn(ddev, "config %d interface %d altsetting %d has %d "
496 "endpoint descriptor%s, different from the interface "
497 "descriptor's value: %d\n",
498 cfgno, inum, asnum, n, plural(n), num_ep_orig);
499 return buffer - buffer0;
501 skip_to_next_interface_descriptor:
502 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
503 USB_DT_INTERFACE, NULL);
504 return buffer - buffer0 + i;
507 static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
508 struct usb_host_config *config, unsigned char *buffer, int size)
510 struct device *ddev = &dev->dev;
511 unsigned char *buffer0 = buffer;
513 int nintf, nintf_orig;
515 struct usb_interface_cache *intfc;
516 unsigned char *buffer2;
518 struct usb_descriptor_header *header;
520 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
521 unsigned iad_num = 0;
523 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
524 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
525 config->desc.bLength < USB_DT_CONFIG_SIZE ||
526 config->desc.bLength > size) {
527 dev_err(ddev, "invalid descriptor for config index %d: "
528 "type = 0x%X, length = %d\n", cfgidx,
529 config->desc.bDescriptorType, config->desc.bLength);
532 cfgno = config->desc.bConfigurationValue;
534 buffer += config->desc.bLength;
535 size -= config->desc.bLength;
537 nintf = nintf_orig = config->desc.bNumInterfaces;
538 if (nintf > USB_MAXINTERFACES) {
539 dev_warn(ddev, "config %d has too many interfaces: %d, "
540 "using maximum allowed: %d\n",
541 cfgno, nintf, USB_MAXINTERFACES);
542 nintf = USB_MAXINTERFACES;
545 /* Go through the descriptors, checking their length and counting the
546 * number of altsettings for each interface */
548 for ((buffer2 = buffer, size2 = size);
550 (buffer2 += header->bLength, size2 -= header->bLength)) {
552 if (size2 < sizeof(struct usb_descriptor_header)) {
553 dev_warn(ddev, "config %d descriptor has %d excess "
554 "byte%s, ignoring\n",
555 cfgno, size2, plural(size2));
559 header = (struct usb_descriptor_header *) buffer2;
560 if ((header->bLength > size2) || (header->bLength < 2)) {
561 dev_warn(ddev, "config %d has an invalid descriptor "
562 "of length %d, skipping remainder of the config\n",
563 cfgno, header->bLength);
567 if (header->bDescriptorType == USB_DT_INTERFACE) {
568 struct usb_interface_descriptor *d;
571 d = (struct usb_interface_descriptor *) header;
572 if (d->bLength < USB_DT_INTERFACE_SIZE) {
573 dev_warn(ddev, "config %d has an invalid "
574 "interface descriptor of length %d, "
575 "skipping\n", cfgno, d->bLength);
579 inum = d->bInterfaceNumber;
581 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
583 dev_warn(ddev, "config %d has more interface "
584 "descriptors, than it declares in "
585 "bNumInterfaces, ignoring interface "
586 "number: %d\n", cfgno, inum);
590 if (inum >= nintf_orig)
591 dev_warn(ddev, "config %d has an invalid "
592 "interface number: %d but max is %d\n",
593 cfgno, inum, nintf_orig - 1);
595 /* Have we already encountered this interface?
596 * Count its altsettings */
597 for (i = 0; i < n; ++i) {
598 if (inums[i] == inum)
604 } else if (n < USB_MAXINTERFACES) {
610 } else if (header->bDescriptorType ==
611 USB_DT_INTERFACE_ASSOCIATION) {
612 struct usb_interface_assoc_descriptor *d;
614 d = (struct usb_interface_assoc_descriptor *)header;
615 if (d->bLength < USB_DT_INTERFACE_ASSOCIATION_SIZE) {
617 "config %d has an invalid interface association descriptor of length %d, skipping\n",
622 if (iad_num == USB_MAXIADS) {
623 dev_warn(ddev, "found more Interface "
624 "Association Descriptors "
625 "than allocated for in "
626 "configuration %d\n", cfgno);
628 config->intf_assoc[iad_num] = d;
632 } else if (header->bDescriptorType == USB_DT_DEVICE ||
633 header->bDescriptorType == USB_DT_CONFIG)
634 dev_warn(ddev, "config %d contains an unexpected "
635 "descriptor of type 0x%X, skipping\n",
636 cfgno, header->bDescriptorType);
638 } /* for ((buffer2 = buffer, size2 = size); ...) */
639 size = buffer2 - buffer;
640 config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
643 dev_warn(ddev, "config %d has %d interface%s, different from "
644 "the descriptor's value: %d\n",
645 cfgno, n, plural(n), nintf_orig);
647 dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
648 config->desc.bNumInterfaces = nintf = n;
650 /* Check for missing interface numbers */
651 for (i = 0; i < nintf; ++i) {
652 for (j = 0; j < nintf; ++j) {
657 dev_warn(ddev, "config %d has no interface number "
661 /* Allocate the usb_interface_caches and altsetting arrays */
662 for (i = 0; i < nintf; ++i) {
664 if (j > USB_MAXALTSETTING) {
665 dev_warn(ddev, "too many alternate settings for "
666 "config %d interface %d: %d, "
667 "using maximum allowed: %d\n",
668 cfgno, inums[i], j, USB_MAXALTSETTING);
669 nalts[i] = j = USB_MAXALTSETTING;
672 len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
673 config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
676 kref_init(&intfc->ref);
679 /* FIXME: parse the BOS descriptor */
681 /* Skip over any Class Specific or Vendor Specific descriptors;
682 * find the first interface descriptor */
683 config->extra = buffer;
684 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
685 USB_DT_INTERFACE, &n);
686 config->extralen = i;
688 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
689 n, plural(n), "configuration");
693 /* Parse all the interface/altsetting descriptors */
695 retval = usb_parse_interface(ddev, cfgno, config,
696 buffer, size, inums, nalts);
704 /* Check for missing altsettings */
705 for (i = 0; i < nintf; ++i) {
706 intfc = config->intf_cache[i];
707 for (j = 0; j < intfc->num_altsetting; ++j) {
708 for (n = 0; n < intfc->num_altsetting; ++n) {
709 if (intfc->altsetting[n].desc.
710 bAlternateSetting == j)
713 if (n >= intfc->num_altsetting)
714 dev_warn(ddev, "config %d interface %d has no "
715 "altsetting %d\n", cfgno, inums[i], j);
722 /* hub-only!! ... and only exported for reset/reinit path.
723 * otherwise used internally on disconnect/destroy path
725 void usb_destroy_configuration(struct usb_device *dev)
732 if (dev->rawdescriptors) {
733 for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
734 kfree(dev->rawdescriptors[i]);
736 kfree(dev->rawdescriptors);
737 dev->rawdescriptors = NULL;
740 for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
741 struct usb_host_config *cf = &dev->config[c];
744 for (i = 0; i < cf->desc.bNumInterfaces; i++) {
745 if (cf->intf_cache[i])
746 kref_put(&cf->intf_cache[i]->ref,
747 usb_release_interface_cache);
756 * Get the USB config descriptors, cache and parse'em
758 * hub-only!! ... and only in reset path, or usb_new_device()
759 * (used by real hubs and virtual root hubs)
761 * NOTE: if this is a WUSB device and is not authorized, we skip the
762 * whole thing. A non-authorized USB device has no
765 int usb_get_configuration(struct usb_device *dev)
767 struct device *ddev = &dev->dev;
768 int ncfg = dev->descriptor.bNumConfigurations;
770 unsigned int cfgno, length;
771 unsigned char *bigbuffer;
772 struct usb_config_descriptor *desc;
775 if (dev->authorized == 0) /* Not really an error */
776 goto out_not_authorized;
778 if (ncfg > USB_MAXCONFIG) {
779 dev_warn(ddev, "too many configurations: %d, "
780 "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
781 dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
785 dev_err(ddev, "no configurations\n");
789 length = ncfg * sizeof(struct usb_host_config);
790 dev->config = kzalloc(length, GFP_KERNEL);
794 length = ncfg * sizeof(char *);
795 dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
796 if (!dev->rawdescriptors)
799 desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
804 for (; cfgno < ncfg; cfgno++) {
805 /* We grab just the first descriptor so we know how long
806 * the whole configuration is */
807 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
808 desc, USB_DT_CONFIG_SIZE);
810 dev_err(ddev, "unable to read config index %d "
811 "descriptor/%s: %d\n", cfgno, "start", result);
812 dev_err(ddev, "chopping to %d config(s)\n", cfgno);
813 dev->descriptor.bNumConfigurations = cfgno;
815 } else if (result < 4) {
816 dev_err(ddev, "config index %d descriptor too short "
817 "(expected %i, got %i)\n", cfgno,
818 USB_DT_CONFIG_SIZE, result);
822 length = max((int) le16_to_cpu(desc->wTotalLength),
825 /* Now that we know the length, get the whole thing */
826 bigbuffer = kmalloc(length, GFP_KERNEL);
832 if (dev->quirks & USB_QUIRK_DELAY_INIT)
835 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
838 dev_err(ddev, "unable to read config index %d "
839 "descriptor/%s\n", cfgno, "all");
843 if (result < length) {
844 dev_warn(ddev, "config index %d descriptor too short "
845 "(expected %i, got %i)\n", cfgno, length, result);
849 dev->rawdescriptors[cfgno] = bigbuffer;
851 result = usb_parse_configuration(dev, cfgno,
852 &dev->config[cfgno], bigbuffer, length);
863 dev->descriptor.bNumConfigurations = cfgno;
865 if (result == -ENOMEM)
866 dev_err(ddev, "out of memory\n");
870 void usb_release_bos_descriptor(struct usb_device *dev)
873 kfree(dev->bos->desc);
879 /* Get BOS descriptor set */
880 int usb_get_bos_descriptor(struct usb_device *dev)
882 struct device *ddev = &dev->dev;
883 struct usb_bos_descriptor *bos;
884 struct usb_dev_cap_header *cap;
885 unsigned char *buffer;
886 int length, total_len, num, i;
889 bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
893 /* Get BOS descriptor */
894 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, bos, USB_DT_BOS_SIZE);
895 if (ret < USB_DT_BOS_SIZE) {
896 dev_err(ddev, "unable to get BOS descriptor\n");
903 length = bos->bLength;
904 total_len = le16_to_cpu(bos->wTotalLength);
905 num = bos->bNumDeviceCaps;
907 if (total_len < length)
910 dev->bos = kzalloc(sizeof(struct usb_host_bos), GFP_KERNEL);
914 /* Now let's get the whole BOS descriptor set */
915 buffer = kzalloc(total_len, GFP_KERNEL);
920 dev->bos->desc = (struct usb_bos_descriptor *)buffer;
922 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, buffer, total_len);
923 if (ret < total_len) {
924 dev_err(ddev, "unable to get BOS descriptor set\n");
931 for (i = 0; i < num; i++) {
933 cap = (struct usb_dev_cap_header *)buffer;
934 length = cap->bLength;
936 if (total_len < length)
940 if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
941 dev_warn(ddev, "descriptor type invalid, skip\n");
945 switch (cap->bDevCapabilityType) {
946 case USB_CAP_TYPE_WIRELESS_USB:
947 /* Wireless USB cap descriptor is handled by wusb */
949 case USB_CAP_TYPE_EXT:
951 (struct usb_ext_cap_descriptor *)buffer;
953 case USB_SS_CAP_TYPE:
955 (struct usb_ss_cap_descriptor *)buffer;
957 case CONTAINER_ID_TYPE:
959 (struct usb_ss_container_id_descriptor *)buffer;
969 usb_release_bos_descriptor(dev);