2 * Released under the GPLv2 only.
3 * SPDX-License-Identifier: GPL-2.0
7 #include <linux/usb/ch9.h>
8 #include <linux/usb/hcd.h>
9 #include <linux/usb/quirks.h>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/device.h>
13 #include <asm/byteorder.h>
17 #define USB_MAXALTSETTING 128 /* Hard limit */
19 #define USB_MAXCONFIG 8 /* Arbitrary limit */
22 static inline const char *plural(int n)
24 return (n == 1 ? "" : "s");
27 static int find_next_descriptor(unsigned char *buffer, int size,
28 int dt1, int dt2, int *num_skipped)
30 struct usb_descriptor_header *h;
32 unsigned char *buffer0 = buffer;
34 /* Find the next descriptor of type dt1 or dt2 */
36 h = (struct usb_descriptor_header *) buffer;
37 if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
44 /* Store the number of descriptors skipped and return the
45 * number of bytes skipped */
48 return buffer - buffer0;
51 static void usb_parse_ssp_isoc_endpoint_companion(struct device *ddev,
52 int cfgno, int inum, int asnum, struct usb_host_endpoint *ep,
53 unsigned char *buffer, int size)
55 struct usb_ssp_isoc_ep_comp_descriptor *desc;
58 * The SuperSpeedPlus Isoc endpoint companion descriptor immediately
59 * follows the SuperSpeed Endpoint Companion descriptor
61 desc = (struct usb_ssp_isoc_ep_comp_descriptor *) buffer;
62 if (desc->bDescriptorType != USB_DT_SSP_ISOC_ENDPOINT_COMP ||
63 size < USB_DT_SSP_ISOC_EP_COMP_SIZE) {
64 dev_warn(ddev, "Invalid SuperSpeedPlus isoc endpoint companion"
65 "for config %d interface %d altsetting %d ep %d.\n",
66 cfgno, inum, asnum, ep->desc.bEndpointAddress);
69 memcpy(&ep->ssp_isoc_ep_comp, desc, USB_DT_SSP_ISOC_EP_COMP_SIZE);
72 static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
73 int inum, int asnum, struct usb_host_endpoint *ep,
74 unsigned char *buffer, int size)
76 struct usb_ss_ep_comp_descriptor *desc;
79 /* The SuperSpeed endpoint companion descriptor is supposed to
80 * be the first thing immediately following the endpoint descriptor.
82 desc = (struct usb_ss_ep_comp_descriptor *) buffer;
84 if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP ||
85 size < USB_DT_SS_EP_COMP_SIZE) {
86 dev_warn(ddev, "No SuperSpeed endpoint companion for config %d "
87 " interface %d altsetting %d ep %d: "
88 "using minimum values\n",
89 cfgno, inum, asnum, ep->desc.bEndpointAddress);
91 /* Fill in some default values.
92 * Leave bmAttributes as zero, which will mean no streams for
93 * bulk, and isoc won't support multiple bursts of packets.
94 * With bursts of only one packet, and a Mult of 1, the max
95 * amount of data moved per endpoint service interval is one
98 ep->ss_ep_comp.bLength = USB_DT_SS_EP_COMP_SIZE;
99 ep->ss_ep_comp.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
100 if (usb_endpoint_xfer_isoc(&ep->desc) ||
101 usb_endpoint_xfer_int(&ep->desc))
102 ep->ss_ep_comp.wBytesPerInterval =
103 ep->desc.wMaxPacketSize;
106 buffer += desc->bLength;
107 size -= desc->bLength;
108 memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE);
110 /* Check the various values */
111 if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) {
112 dev_warn(ddev, "Control endpoint with bMaxBurst = %d in "
113 "config %d interface %d altsetting %d ep %d: "
114 "setting to zero\n", desc->bMaxBurst,
115 cfgno, inum, asnum, ep->desc.bEndpointAddress);
116 ep->ss_ep_comp.bMaxBurst = 0;
117 } else if (desc->bMaxBurst > 15) {
118 dev_warn(ddev, "Endpoint with bMaxBurst = %d in "
119 "config %d interface %d altsetting %d ep %d: "
120 "setting to 15\n", desc->bMaxBurst,
121 cfgno, inum, asnum, ep->desc.bEndpointAddress);
122 ep->ss_ep_comp.bMaxBurst = 15;
125 if ((usb_endpoint_xfer_control(&ep->desc) ||
126 usb_endpoint_xfer_int(&ep->desc)) &&
127 desc->bmAttributes != 0) {
128 dev_warn(ddev, "%s endpoint with bmAttributes = %d in "
129 "config %d interface %d altsetting %d ep %d: "
131 usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
133 cfgno, inum, asnum, ep->desc.bEndpointAddress);
134 ep->ss_ep_comp.bmAttributes = 0;
135 } else if (usb_endpoint_xfer_bulk(&ep->desc) &&
136 desc->bmAttributes > 16) {
137 dev_warn(ddev, "Bulk endpoint with more than 65536 streams in "
138 "config %d interface %d altsetting %d ep %d: "
140 cfgno, inum, asnum, ep->desc.bEndpointAddress);
141 ep->ss_ep_comp.bmAttributes = 16;
142 } else if (usb_endpoint_xfer_isoc(&ep->desc) &&
143 !USB_SS_SSP_ISOC_COMP(desc->bmAttributes) &&
144 USB_SS_MULT(desc->bmAttributes) > 3) {
145 dev_warn(ddev, "Isoc endpoint has Mult of %d in "
146 "config %d interface %d altsetting %d ep %d: "
148 USB_SS_MULT(desc->bmAttributes),
149 cfgno, inum, asnum, ep->desc.bEndpointAddress);
150 ep->ss_ep_comp.bmAttributes = 2;
153 if (usb_endpoint_xfer_isoc(&ep->desc))
154 max_tx = (desc->bMaxBurst + 1) *
155 (USB_SS_MULT(desc->bmAttributes)) *
156 usb_endpoint_maxp(&ep->desc);
157 else if (usb_endpoint_xfer_int(&ep->desc))
158 max_tx = usb_endpoint_maxp(&ep->desc) *
159 (desc->bMaxBurst + 1);
162 if (le16_to_cpu(desc->wBytesPerInterval) > max_tx) {
163 dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
164 "config %d interface %d altsetting %d ep %d: "
166 usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
167 le16_to_cpu(desc->wBytesPerInterval),
168 cfgno, inum, asnum, ep->desc.bEndpointAddress,
170 ep->ss_ep_comp.wBytesPerInterval = cpu_to_le16(max_tx);
172 /* Parse a possible SuperSpeedPlus isoc ep companion descriptor */
173 if (usb_endpoint_xfer_isoc(&ep->desc) &&
174 USB_SS_SSP_ISOC_COMP(desc->bmAttributes))
175 usb_parse_ssp_isoc_endpoint_companion(ddev, cfgno, inum, asnum,
179 static const unsigned short low_speed_maxpacket_maxes[4] = {
180 [USB_ENDPOINT_XFER_CONTROL] = 8,
181 [USB_ENDPOINT_XFER_ISOC] = 0,
182 [USB_ENDPOINT_XFER_BULK] = 0,
183 [USB_ENDPOINT_XFER_INT] = 8,
185 static const unsigned short full_speed_maxpacket_maxes[4] = {
186 [USB_ENDPOINT_XFER_CONTROL] = 64,
187 [USB_ENDPOINT_XFER_ISOC] = 1023,
188 [USB_ENDPOINT_XFER_BULK] = 64,
189 [USB_ENDPOINT_XFER_INT] = 64,
191 static const unsigned short high_speed_maxpacket_maxes[4] = {
192 [USB_ENDPOINT_XFER_CONTROL] = 64,
193 [USB_ENDPOINT_XFER_ISOC] = 1024,
194 [USB_ENDPOINT_XFER_BULK] = 512,
195 [USB_ENDPOINT_XFER_INT] = 1024,
197 static const unsigned short super_speed_maxpacket_maxes[4] = {
198 [USB_ENDPOINT_XFER_CONTROL] = 512,
199 [USB_ENDPOINT_XFER_ISOC] = 1024,
200 [USB_ENDPOINT_XFER_BULK] = 1024,
201 [USB_ENDPOINT_XFER_INT] = 1024,
204 static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
205 int asnum, struct usb_host_interface *ifp, int num_ep,
206 unsigned char *buffer, int size)
208 unsigned char *buffer0 = buffer;
209 struct usb_endpoint_descriptor *d;
210 struct usb_host_endpoint *endpoint;
213 const unsigned short *maxpacket_maxes;
215 d = (struct usb_endpoint_descriptor *) buffer;
216 buffer += d->bLength;
219 if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
220 n = USB_DT_ENDPOINT_AUDIO_SIZE;
221 else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
222 n = USB_DT_ENDPOINT_SIZE;
224 dev_warn(ddev, "config %d interface %d altsetting %d has an "
225 "invalid endpoint descriptor of length %d, skipping\n",
226 cfgno, inum, asnum, d->bLength);
227 goto skip_to_next_endpoint_or_interface_descriptor;
230 i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK;
231 if (i >= 16 || i == 0) {
232 dev_warn(ddev, "config %d interface %d altsetting %d has an "
233 "invalid endpoint with address 0x%X, skipping\n",
234 cfgno, inum, asnum, d->bEndpointAddress);
235 goto skip_to_next_endpoint_or_interface_descriptor;
238 /* Only store as many endpoints as we have room for */
239 if (ifp->desc.bNumEndpoints >= num_ep)
240 goto skip_to_next_endpoint_or_interface_descriptor;
242 /* Check for duplicate endpoint addresses */
243 for (i = 0; i < ifp->desc.bNumEndpoints; ++i) {
244 if (ifp->endpoint[i].desc.bEndpointAddress ==
245 d->bEndpointAddress) {
246 dev_warn(ddev, "config %d interface %d altsetting %d has a duplicate endpoint with address 0x%X, skipping\n",
247 cfgno, inum, asnum, d->bEndpointAddress);
248 goto skip_to_next_endpoint_or_interface_descriptor;
252 endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
253 ++ifp->desc.bNumEndpoints;
255 memcpy(&endpoint->desc, d, n);
256 INIT_LIST_HEAD(&endpoint->urb_list);
259 * Fix up bInterval values outside the legal range.
260 * Use 10 or 8 ms if no proper value can be guessed.
262 i = 0; /* i = min, j = max, n = default */
264 if (usb_endpoint_xfer_int(d)) {
266 switch (to_usb_device(ddev)->speed) {
267 case USB_SPEED_SUPER_PLUS:
268 case USB_SPEED_SUPER:
271 * Many device manufacturers are using full-speed
272 * bInterval values in high-speed interrupt endpoint
273 * descriptors. Try to fix those and fall back to an
274 * 8-ms default value otherwise.
276 n = fls(d->bInterval*8);
278 n = 7; /* 8 ms = 2^(7-1) uframes */
282 * Adjust bInterval for quirked devices.
283 * This quirk fixes bIntervals reported in
284 * linear microframes.
286 if (to_usb_device(ddev)->quirks &
287 USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL) {
288 n = clamp(fls(d->bInterval), i, j);
292 default: /* USB_SPEED_FULL or _LOW */
294 * For low-speed, 10 ms is the official minimum.
295 * But some "overclocked" devices might want faster
296 * polling so we'll allow it.
301 } else if (usb_endpoint_xfer_isoc(d)) {
304 switch (to_usb_device(ddev)->speed) {
306 n = 7; /* 8 ms = 2^(7-1) uframes */
308 default: /* USB_SPEED_FULL */
309 n = 4; /* 8 ms = 2^(4-1) frames */
313 if (d->bInterval < i || d->bInterval > j) {
314 dev_warn(ddev, "config %d interface %d altsetting %d "
315 "endpoint 0x%X has an invalid bInterval %d, "
318 d->bEndpointAddress, d->bInterval, n);
319 endpoint->desc.bInterval = n;
322 /* Some buggy low-speed devices have Bulk endpoints, which is
323 * explicitly forbidden by the USB spec. In an attempt to make
324 * them usable, we will try treating them as Interrupt endpoints.
326 if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
327 usb_endpoint_xfer_bulk(d)) {
328 dev_warn(ddev, "config %d interface %d altsetting %d "
329 "endpoint 0x%X is Bulk; changing to Interrupt\n",
330 cfgno, inum, asnum, d->bEndpointAddress);
331 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
332 endpoint->desc.bInterval = 1;
333 if (usb_endpoint_maxp(&endpoint->desc) > 8)
334 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
337 /* Validate the wMaxPacketSize field */
338 maxp = usb_endpoint_maxp(&endpoint->desc);
340 /* Find the highest legal maxpacket size for this endpoint */
341 i = 0; /* additional transactions per microframe */
342 switch (to_usb_device(ddev)->speed) {
344 maxpacket_maxes = low_speed_maxpacket_maxes;
347 maxpacket_maxes = full_speed_maxpacket_maxes;
350 /* Bits 12..11 are allowed only for HS periodic endpoints */
351 if (usb_endpoint_xfer_int(d) || usb_endpoint_xfer_isoc(d)) {
352 i = maxp & (BIT(12) | BIT(11));
357 maxpacket_maxes = high_speed_maxpacket_maxes;
359 case USB_SPEED_SUPER:
360 case USB_SPEED_SUPER_PLUS:
361 maxpacket_maxes = super_speed_maxpacket_maxes;
364 j = maxpacket_maxes[usb_endpoint_type(&endpoint->desc)];
367 dev_warn(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid maxpacket %d, setting to %d\n",
368 cfgno, inum, asnum, d->bEndpointAddress, maxp, j);
370 endpoint->desc.wMaxPacketSize = cpu_to_le16(i | maxp);
374 * Some buggy high speed devices have bulk endpoints using
375 * maxpacket sizes other than 512. High speed HCDs may not
376 * be able to handle that particular bug, so let's warn...
378 if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
379 && usb_endpoint_xfer_bulk(d)) {
381 dev_warn(ddev, "config %d interface %d altsetting %d "
382 "bulk endpoint 0x%X has invalid maxpacket %d\n",
383 cfgno, inum, asnum, d->bEndpointAddress,
387 /* Parse a possible SuperSpeed endpoint companion descriptor */
388 if (to_usb_device(ddev)->speed >= USB_SPEED_SUPER)
389 usb_parse_ss_endpoint_companion(ddev, cfgno,
390 inum, asnum, endpoint, buffer, size);
392 /* Skip over any Class Specific or Vendor Specific descriptors;
393 * find the next endpoint or interface descriptor */
394 endpoint->extra = buffer;
395 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
396 USB_DT_INTERFACE, &n);
397 endpoint->extralen = i;
398 retval = buffer - buffer0 + i;
400 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
401 n, plural(n), "endpoint");
404 skip_to_next_endpoint_or_interface_descriptor:
405 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
406 USB_DT_INTERFACE, NULL);
407 return buffer - buffer0 + i;
410 void usb_release_interface_cache(struct kref *ref)
412 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
415 for (j = 0; j < intfc->num_altsetting; j++) {
416 struct usb_host_interface *alt = &intfc->altsetting[j];
418 kfree(alt->endpoint);
424 static int usb_parse_interface(struct device *ddev, int cfgno,
425 struct usb_host_config *config, unsigned char *buffer, int size,
426 u8 inums[], u8 nalts[])
428 unsigned char *buffer0 = buffer;
429 struct usb_interface_descriptor *d;
431 struct usb_interface_cache *intfc;
432 struct usb_host_interface *alt;
435 int num_ep, num_ep_orig;
437 d = (struct usb_interface_descriptor *) buffer;
438 buffer += d->bLength;
441 if (d->bLength < USB_DT_INTERFACE_SIZE)
442 goto skip_to_next_interface_descriptor;
444 /* Which interface entry is this? */
446 inum = d->bInterfaceNumber;
447 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
448 if (inums[i] == inum) {
449 intfc = config->intf_cache[i];
453 if (!intfc || intfc->num_altsetting >= nalts[i])
454 goto skip_to_next_interface_descriptor;
456 /* Check for duplicate altsetting entries */
457 asnum = d->bAlternateSetting;
458 for ((i = 0, alt = &intfc->altsetting[0]);
459 i < intfc->num_altsetting;
461 if (alt->desc.bAlternateSetting == asnum) {
462 dev_warn(ddev, "Duplicate descriptor for config %d "
463 "interface %d altsetting %d, skipping\n",
465 goto skip_to_next_interface_descriptor;
469 ++intfc->num_altsetting;
470 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
472 /* Skip over any Class Specific or Vendor Specific descriptors;
473 * find the first endpoint or interface descriptor */
475 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
476 USB_DT_INTERFACE, &n);
479 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
480 n, plural(n), "interface");
484 /* Allocate space for the right(?) number of endpoints */
485 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
486 alt->desc.bNumEndpoints = 0; /* Use as a counter */
487 if (num_ep > USB_MAXENDPOINTS) {
488 dev_warn(ddev, "too many endpoints for config %d interface %d "
489 "altsetting %d: %d, using maximum allowed: %d\n",
490 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
491 num_ep = USB_MAXENDPOINTS;
495 /* Can't allocate 0 bytes */
496 len = sizeof(struct usb_host_endpoint) * num_ep;
497 alt->endpoint = kzalloc(len, GFP_KERNEL);
502 /* Parse all the endpoint descriptors */
505 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
508 retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
509 num_ep, buffer, size);
518 if (n != num_ep_orig)
519 dev_warn(ddev, "config %d interface %d altsetting %d has %d "
520 "endpoint descriptor%s, different from the interface "
521 "descriptor's value: %d\n",
522 cfgno, inum, asnum, n, plural(n), num_ep_orig);
523 return buffer - buffer0;
525 skip_to_next_interface_descriptor:
526 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
527 USB_DT_INTERFACE, NULL);
528 return buffer - buffer0 + i;
531 static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
532 struct usb_host_config *config, unsigned char *buffer, int size)
534 struct device *ddev = &dev->dev;
535 unsigned char *buffer0 = buffer;
537 int nintf, nintf_orig;
539 struct usb_interface_cache *intfc;
540 unsigned char *buffer2;
542 struct usb_descriptor_header *header;
544 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
545 unsigned iad_num = 0;
547 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
548 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
549 config->desc.bLength < USB_DT_CONFIG_SIZE ||
550 config->desc.bLength > size) {
551 dev_err(ddev, "invalid descriptor for config index %d: "
552 "type = 0x%X, length = %d\n", cfgidx,
553 config->desc.bDescriptorType, config->desc.bLength);
556 cfgno = config->desc.bConfigurationValue;
558 buffer += config->desc.bLength;
559 size -= config->desc.bLength;
561 nintf = nintf_orig = config->desc.bNumInterfaces;
562 if (nintf > USB_MAXINTERFACES) {
563 dev_warn(ddev, "config %d has too many interfaces: %d, "
564 "using maximum allowed: %d\n",
565 cfgno, nintf, USB_MAXINTERFACES);
566 nintf = USB_MAXINTERFACES;
569 /* Go through the descriptors, checking their length and counting the
570 * number of altsettings for each interface */
572 for ((buffer2 = buffer, size2 = size);
574 (buffer2 += header->bLength, size2 -= header->bLength)) {
576 if (size2 < sizeof(struct usb_descriptor_header)) {
577 dev_warn(ddev, "config %d descriptor has %d excess "
578 "byte%s, ignoring\n",
579 cfgno, size2, plural(size2));
583 header = (struct usb_descriptor_header *) buffer2;
584 if ((header->bLength > size2) || (header->bLength < 2)) {
585 dev_warn(ddev, "config %d has an invalid descriptor "
586 "of length %d, skipping remainder of the config\n",
587 cfgno, header->bLength);
591 if (header->bDescriptorType == USB_DT_INTERFACE) {
592 struct usb_interface_descriptor *d;
595 d = (struct usb_interface_descriptor *) header;
596 if (d->bLength < USB_DT_INTERFACE_SIZE) {
597 dev_warn(ddev, "config %d has an invalid "
598 "interface descriptor of length %d, "
599 "skipping\n", cfgno, d->bLength);
603 inum = d->bInterfaceNumber;
605 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
607 dev_warn(ddev, "config %d has more interface "
608 "descriptors, than it declares in "
609 "bNumInterfaces, ignoring interface "
610 "number: %d\n", cfgno, inum);
614 if (inum >= nintf_orig)
615 dev_warn(ddev, "config %d has an invalid "
616 "interface number: %d but max is %d\n",
617 cfgno, inum, nintf_orig - 1);
619 /* Have we already encountered this interface?
620 * Count its altsettings */
621 for (i = 0; i < n; ++i) {
622 if (inums[i] == inum)
628 } else if (n < USB_MAXINTERFACES) {
634 } else if (header->bDescriptorType ==
635 USB_DT_INTERFACE_ASSOCIATION) {
636 if (iad_num == USB_MAXIADS) {
637 dev_warn(ddev, "found more Interface "
638 "Association Descriptors "
639 "than allocated for in "
640 "configuration %d\n", cfgno);
642 config->intf_assoc[iad_num] =
643 (struct usb_interface_assoc_descriptor
648 } else if (header->bDescriptorType == USB_DT_DEVICE ||
649 header->bDescriptorType == USB_DT_CONFIG)
650 dev_warn(ddev, "config %d contains an unexpected "
651 "descriptor of type 0x%X, skipping\n",
652 cfgno, header->bDescriptorType);
654 } /* for ((buffer2 = buffer, size2 = size); ...) */
655 size = buffer2 - buffer;
656 config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
659 dev_warn(ddev, "config %d has %d interface%s, different from "
660 "the descriptor's value: %d\n",
661 cfgno, n, plural(n), nintf_orig);
663 dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
664 config->desc.bNumInterfaces = nintf = n;
666 /* Check for missing interface numbers */
667 for (i = 0; i < nintf; ++i) {
668 for (j = 0; j < nintf; ++j) {
673 dev_warn(ddev, "config %d has no interface number "
677 /* Allocate the usb_interface_caches and altsetting arrays */
678 for (i = 0; i < nintf; ++i) {
680 if (j > USB_MAXALTSETTING) {
681 dev_warn(ddev, "too many alternate settings for "
682 "config %d interface %d: %d, "
683 "using maximum allowed: %d\n",
684 cfgno, inums[i], j, USB_MAXALTSETTING);
685 nalts[i] = j = USB_MAXALTSETTING;
688 len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
689 config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
692 kref_init(&intfc->ref);
695 /* FIXME: parse the BOS descriptor */
697 /* Skip over any Class Specific or Vendor Specific descriptors;
698 * find the first interface descriptor */
699 config->extra = buffer;
700 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
701 USB_DT_INTERFACE, &n);
702 config->extralen = i;
704 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
705 n, plural(n), "configuration");
709 /* Parse all the interface/altsetting descriptors */
711 retval = usb_parse_interface(ddev, cfgno, config,
712 buffer, size, inums, nalts);
720 /* Check for missing altsettings */
721 for (i = 0; i < nintf; ++i) {
722 intfc = config->intf_cache[i];
723 for (j = 0; j < intfc->num_altsetting; ++j) {
724 for (n = 0; n < intfc->num_altsetting; ++n) {
725 if (intfc->altsetting[n].desc.
726 bAlternateSetting == j)
729 if (n >= intfc->num_altsetting)
730 dev_warn(ddev, "config %d interface %d has no "
731 "altsetting %d\n", cfgno, inums[i], j);
738 /* hub-only!! ... and only exported for reset/reinit path.
739 * otherwise used internally on disconnect/destroy path
741 void usb_destroy_configuration(struct usb_device *dev)
748 if (dev->rawdescriptors) {
749 for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
750 kfree(dev->rawdescriptors[i]);
752 kfree(dev->rawdescriptors);
753 dev->rawdescriptors = NULL;
756 for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
757 struct usb_host_config *cf = &dev->config[c];
760 for (i = 0; i < cf->desc.bNumInterfaces; i++) {
761 if (cf->intf_cache[i])
762 kref_put(&cf->intf_cache[i]->ref,
763 usb_release_interface_cache);
772 * Get the USB config descriptors, cache and parse'em
774 * hub-only!! ... and only in reset path, or usb_new_device()
775 * (used by real hubs and virtual root hubs)
777 int usb_get_configuration(struct usb_device *dev)
779 struct device *ddev = &dev->dev;
780 int ncfg = dev->descriptor.bNumConfigurations;
782 unsigned int cfgno, length;
783 unsigned char *bigbuffer;
784 struct usb_config_descriptor *desc;
788 if (ncfg > USB_MAXCONFIG) {
789 dev_warn(ddev, "too many configurations: %d, "
790 "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
791 dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
795 dev_err(ddev, "no configurations\n");
799 length = ncfg * sizeof(struct usb_host_config);
800 dev->config = kzalloc(length, GFP_KERNEL);
804 length = ncfg * sizeof(char *);
805 dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
806 if (!dev->rawdescriptors)
809 desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
814 for (; cfgno < ncfg; cfgno++) {
815 /* We grab just the first descriptor so we know how long
816 * the whole configuration is */
817 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
818 desc, USB_DT_CONFIG_SIZE);
820 dev_err(ddev, "unable to read config index %d "
821 "descriptor/%s: %d\n", cfgno, "start", result);
822 if (result != -EPIPE)
824 dev_err(ddev, "chopping to %d config(s)\n", cfgno);
825 dev->descriptor.bNumConfigurations = cfgno;
827 } else if (result < 4) {
828 dev_err(ddev, "config index %d descriptor too short "
829 "(expected %i, got %i)\n", cfgno,
830 USB_DT_CONFIG_SIZE, result);
834 length = max((int) le16_to_cpu(desc->wTotalLength),
837 /* Now that we know the length, get the whole thing */
838 bigbuffer = kmalloc(length, GFP_KERNEL);
844 if (dev->quirks & USB_QUIRK_DELAY_INIT)
847 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
850 dev_err(ddev, "unable to read config index %d "
851 "descriptor/%s\n", cfgno, "all");
855 if (result < length) {
856 dev_warn(ddev, "config index %d descriptor too short "
857 "(expected %i, got %i)\n", cfgno, length, result);
861 dev->rawdescriptors[cfgno] = bigbuffer;
863 result = usb_parse_configuration(dev, cfgno,
864 &dev->config[cfgno], bigbuffer, length);
874 dev->descriptor.bNumConfigurations = cfgno;
876 if (result == -ENOMEM)
877 dev_err(ddev, "out of memory\n");
881 void usb_release_bos_descriptor(struct usb_device *dev)
884 kfree(dev->bos->desc);
890 /* Get BOS descriptor set */
891 int usb_get_bos_descriptor(struct usb_device *dev)
893 struct device *ddev = &dev->dev;
894 struct usb_bos_descriptor *bos;
895 struct usb_dev_cap_header *cap;
896 unsigned char *buffer;
897 int length, total_len, num, i;
900 bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
904 /* Get BOS descriptor */
905 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, bos, USB_DT_BOS_SIZE);
906 if (ret < USB_DT_BOS_SIZE) {
907 dev_err(ddev, "unable to get BOS descriptor\n");
914 length = bos->bLength;
915 total_len = le16_to_cpu(bos->wTotalLength);
916 num = bos->bNumDeviceCaps;
918 if (total_len < length)
921 dev->bos = kzalloc(sizeof(struct usb_host_bos), GFP_KERNEL);
925 /* Now let's get the whole BOS descriptor set */
926 buffer = kzalloc(total_len, GFP_KERNEL);
931 dev->bos->desc = (struct usb_bos_descriptor *)buffer;
933 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, buffer, total_len);
934 if (ret < total_len) {
935 dev_err(ddev, "unable to get BOS descriptor set\n");
942 for (i = 0; i < num; i++) {
944 cap = (struct usb_dev_cap_header *)buffer;
945 length = cap->bLength;
947 if (total_len < length)
951 if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
952 dev_warn(ddev, "descriptor type invalid, skip\n");
956 switch (cap->bDevCapabilityType) {
957 case USB_CAP_TYPE_WIRELESS_USB:
958 /* Wireless USB cap descriptor is handled by wusb */
960 case USB_CAP_TYPE_EXT:
962 (struct usb_ext_cap_descriptor *)buffer;
964 case USB_SS_CAP_TYPE:
966 (struct usb_ss_cap_descriptor *)buffer;
968 case USB_SSP_CAP_TYPE:
970 (struct usb_ssp_cap_descriptor *)buffer;
972 case CONTAINER_ID_TYPE:
974 (struct usb_ss_container_id_descriptor *)buffer;
976 case USB_PTM_CAP_TYPE:
978 (struct usb_ptm_cap_descriptor *)buffer;
987 usb_release_bos_descriptor(dev);