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 endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
243 ++ifp->desc.bNumEndpoints;
245 memcpy(&endpoint->desc, d, n);
246 INIT_LIST_HEAD(&endpoint->urb_list);
249 * Fix up bInterval values outside the legal range.
250 * Use 10 or 8 ms if no proper value can be guessed.
252 i = 0; /* i = min, j = max, n = default */
254 if (usb_endpoint_xfer_int(d)) {
256 switch (to_usb_device(ddev)->speed) {
257 case USB_SPEED_SUPER_PLUS:
258 case USB_SPEED_SUPER:
261 * Many device manufacturers are using full-speed
262 * bInterval values in high-speed interrupt endpoint
263 * descriptors. Try to fix those and fall back to an
264 * 8-ms default value otherwise.
266 n = fls(d->bInterval*8);
268 n = 7; /* 8 ms = 2^(7-1) uframes */
272 * Adjust bInterval for quirked devices.
273 * This quirk fixes bIntervals reported in
274 * linear microframes.
276 if (to_usb_device(ddev)->quirks &
277 USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL) {
278 n = clamp(fls(d->bInterval), i, j);
282 default: /* USB_SPEED_FULL or _LOW */
284 * For low-speed, 10 ms is the official minimum.
285 * But some "overclocked" devices might want faster
286 * polling so we'll allow it.
291 } else if (usb_endpoint_xfer_isoc(d)) {
294 switch (to_usb_device(ddev)->speed) {
296 n = 7; /* 8 ms = 2^(7-1) uframes */
298 default: /* USB_SPEED_FULL */
299 n = 4; /* 8 ms = 2^(4-1) frames */
303 if (d->bInterval < i || d->bInterval > j) {
304 dev_warn(ddev, "config %d interface %d altsetting %d "
305 "endpoint 0x%X has an invalid bInterval %d, "
308 d->bEndpointAddress, d->bInterval, n);
309 endpoint->desc.bInterval = n;
312 /* Some buggy low-speed devices have Bulk endpoints, which is
313 * explicitly forbidden by the USB spec. In an attempt to make
314 * them usable, we will try treating them as Interrupt endpoints.
316 if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
317 usb_endpoint_xfer_bulk(d)) {
318 dev_warn(ddev, "config %d interface %d altsetting %d "
319 "endpoint 0x%X is Bulk; changing to Interrupt\n",
320 cfgno, inum, asnum, d->bEndpointAddress);
321 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
322 endpoint->desc.bInterval = 1;
323 if (usb_endpoint_maxp(&endpoint->desc) > 8)
324 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
327 /* Validate the wMaxPacketSize field */
328 maxp = usb_endpoint_maxp(&endpoint->desc);
330 /* Find the highest legal maxpacket size for this endpoint */
331 i = 0; /* additional transactions per microframe */
332 switch (to_usb_device(ddev)->speed) {
334 maxpacket_maxes = low_speed_maxpacket_maxes;
337 maxpacket_maxes = full_speed_maxpacket_maxes;
340 /* Bits 12..11 are allowed only for HS periodic endpoints */
341 if (usb_endpoint_xfer_int(d) || usb_endpoint_xfer_isoc(d)) {
342 i = maxp & (BIT(12) | BIT(11));
347 maxpacket_maxes = high_speed_maxpacket_maxes;
349 case USB_SPEED_SUPER:
350 case USB_SPEED_SUPER_PLUS:
351 maxpacket_maxes = super_speed_maxpacket_maxes;
354 j = maxpacket_maxes[usb_endpoint_type(&endpoint->desc)];
357 dev_warn(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid maxpacket %d, setting to %d\n",
358 cfgno, inum, asnum, d->bEndpointAddress, maxp, j);
360 endpoint->desc.wMaxPacketSize = cpu_to_le16(i | maxp);
364 * Some buggy high speed devices have bulk endpoints using
365 * maxpacket sizes other than 512. High speed HCDs may not
366 * be able to handle that particular bug, so let's warn...
368 if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
369 && usb_endpoint_xfer_bulk(d)) {
371 dev_warn(ddev, "config %d interface %d altsetting %d "
372 "bulk endpoint 0x%X has invalid maxpacket %d\n",
373 cfgno, inum, asnum, d->bEndpointAddress,
377 /* Parse a possible SuperSpeed endpoint companion descriptor */
378 if (to_usb_device(ddev)->speed >= USB_SPEED_SUPER)
379 usb_parse_ss_endpoint_companion(ddev, cfgno,
380 inum, asnum, endpoint, buffer, size);
382 /* Skip over any Class Specific or Vendor Specific descriptors;
383 * find the next endpoint or interface descriptor */
384 endpoint->extra = buffer;
385 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
386 USB_DT_INTERFACE, &n);
387 endpoint->extralen = i;
388 retval = buffer - buffer0 + i;
390 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
391 n, plural(n), "endpoint");
394 skip_to_next_endpoint_or_interface_descriptor:
395 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
396 USB_DT_INTERFACE, NULL);
397 return buffer - buffer0 + i;
400 void usb_release_interface_cache(struct kref *ref)
402 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
405 for (j = 0; j < intfc->num_altsetting; j++) {
406 struct usb_host_interface *alt = &intfc->altsetting[j];
408 kfree(alt->endpoint);
414 static int usb_parse_interface(struct device *ddev, int cfgno,
415 struct usb_host_config *config, unsigned char *buffer, int size,
416 u8 inums[], u8 nalts[])
418 unsigned char *buffer0 = buffer;
419 struct usb_interface_descriptor *d;
421 struct usb_interface_cache *intfc;
422 struct usb_host_interface *alt;
425 int num_ep, num_ep_orig;
427 d = (struct usb_interface_descriptor *) buffer;
428 buffer += d->bLength;
431 if (d->bLength < USB_DT_INTERFACE_SIZE)
432 goto skip_to_next_interface_descriptor;
434 /* Which interface entry is this? */
436 inum = d->bInterfaceNumber;
437 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
438 if (inums[i] == inum) {
439 intfc = config->intf_cache[i];
443 if (!intfc || intfc->num_altsetting >= nalts[i])
444 goto skip_to_next_interface_descriptor;
446 /* Check for duplicate altsetting entries */
447 asnum = d->bAlternateSetting;
448 for ((i = 0, alt = &intfc->altsetting[0]);
449 i < intfc->num_altsetting;
451 if (alt->desc.bAlternateSetting == asnum) {
452 dev_warn(ddev, "Duplicate descriptor for config %d "
453 "interface %d altsetting %d, skipping\n",
455 goto skip_to_next_interface_descriptor;
459 ++intfc->num_altsetting;
460 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
462 /* Skip over any Class Specific or Vendor Specific descriptors;
463 * find the first endpoint or interface descriptor */
465 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
466 USB_DT_INTERFACE, &n);
469 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
470 n, plural(n), "interface");
474 /* Allocate space for the right(?) number of endpoints */
475 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
476 alt->desc.bNumEndpoints = 0; /* Use as a counter */
477 if (num_ep > USB_MAXENDPOINTS) {
478 dev_warn(ddev, "too many endpoints for config %d interface %d "
479 "altsetting %d: %d, using maximum allowed: %d\n",
480 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
481 num_ep = USB_MAXENDPOINTS;
485 /* Can't allocate 0 bytes */
486 len = sizeof(struct usb_host_endpoint) * num_ep;
487 alt->endpoint = kzalloc(len, GFP_KERNEL);
492 /* Parse all the endpoint descriptors */
495 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
498 retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
499 num_ep, buffer, size);
508 if (n != num_ep_orig)
509 dev_warn(ddev, "config %d interface %d altsetting %d has %d "
510 "endpoint descriptor%s, different from the interface "
511 "descriptor's value: %d\n",
512 cfgno, inum, asnum, n, plural(n), num_ep_orig);
513 return buffer - buffer0;
515 skip_to_next_interface_descriptor:
516 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
517 USB_DT_INTERFACE, NULL);
518 return buffer - buffer0 + i;
521 static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
522 struct usb_host_config *config, unsigned char *buffer, int size)
524 struct device *ddev = &dev->dev;
525 unsigned char *buffer0 = buffer;
527 int nintf, nintf_orig;
529 struct usb_interface_cache *intfc;
530 unsigned char *buffer2;
532 struct usb_descriptor_header *header;
534 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
535 unsigned iad_num = 0;
537 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
538 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
539 config->desc.bLength < USB_DT_CONFIG_SIZE ||
540 config->desc.bLength > size) {
541 dev_err(ddev, "invalid descriptor for config index %d: "
542 "type = 0x%X, length = %d\n", cfgidx,
543 config->desc.bDescriptorType, config->desc.bLength);
546 cfgno = config->desc.bConfigurationValue;
548 buffer += config->desc.bLength;
549 size -= config->desc.bLength;
551 nintf = nintf_orig = config->desc.bNumInterfaces;
552 if (nintf > USB_MAXINTERFACES) {
553 dev_warn(ddev, "config %d has too many interfaces: %d, "
554 "using maximum allowed: %d\n",
555 cfgno, nintf, USB_MAXINTERFACES);
556 nintf = USB_MAXINTERFACES;
559 /* Go through the descriptors, checking their length and counting the
560 * number of altsettings for each interface */
562 for ((buffer2 = buffer, size2 = size);
564 (buffer2 += header->bLength, size2 -= header->bLength)) {
566 if (size2 < sizeof(struct usb_descriptor_header)) {
567 dev_warn(ddev, "config %d descriptor has %d excess "
568 "byte%s, ignoring\n",
569 cfgno, size2, plural(size2));
573 header = (struct usb_descriptor_header *) buffer2;
574 if ((header->bLength > size2) || (header->bLength < 2)) {
575 dev_warn(ddev, "config %d has an invalid descriptor "
576 "of length %d, skipping remainder of the config\n",
577 cfgno, header->bLength);
581 if (header->bDescriptorType == USB_DT_INTERFACE) {
582 struct usb_interface_descriptor *d;
585 d = (struct usb_interface_descriptor *) header;
586 if (d->bLength < USB_DT_INTERFACE_SIZE) {
587 dev_warn(ddev, "config %d has an invalid "
588 "interface descriptor of length %d, "
589 "skipping\n", cfgno, d->bLength);
593 inum = d->bInterfaceNumber;
595 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
597 dev_warn(ddev, "config %d has more interface "
598 "descriptors, than it declares in "
599 "bNumInterfaces, ignoring interface "
600 "number: %d\n", cfgno, inum);
604 if (inum >= nintf_orig)
605 dev_warn(ddev, "config %d has an invalid "
606 "interface number: %d but max is %d\n",
607 cfgno, inum, nintf_orig - 1);
609 /* Have we already encountered this interface?
610 * Count its altsettings */
611 for (i = 0; i < n; ++i) {
612 if (inums[i] == inum)
618 } else if (n < USB_MAXINTERFACES) {
624 } else if (header->bDescriptorType ==
625 USB_DT_INTERFACE_ASSOCIATION) {
626 if (iad_num == USB_MAXIADS) {
627 dev_warn(ddev, "found more Interface "
628 "Association Descriptors "
629 "than allocated for in "
630 "configuration %d\n", cfgno);
632 config->intf_assoc[iad_num] =
633 (struct usb_interface_assoc_descriptor
638 } else if (header->bDescriptorType == USB_DT_DEVICE ||
639 header->bDescriptorType == USB_DT_CONFIG)
640 dev_warn(ddev, "config %d contains an unexpected "
641 "descriptor of type 0x%X, skipping\n",
642 cfgno, header->bDescriptorType);
644 } /* for ((buffer2 = buffer, size2 = size); ...) */
645 size = buffer2 - buffer;
646 config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
649 dev_warn(ddev, "config %d has %d interface%s, different from "
650 "the descriptor's value: %d\n",
651 cfgno, n, plural(n), nintf_orig);
653 dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
654 config->desc.bNumInterfaces = nintf = n;
656 /* Check for missing interface numbers */
657 for (i = 0; i < nintf; ++i) {
658 for (j = 0; j < nintf; ++j) {
663 dev_warn(ddev, "config %d has no interface number "
667 /* Allocate the usb_interface_caches and altsetting arrays */
668 for (i = 0; i < nintf; ++i) {
670 if (j > USB_MAXALTSETTING) {
671 dev_warn(ddev, "too many alternate settings for "
672 "config %d interface %d: %d, "
673 "using maximum allowed: %d\n",
674 cfgno, inums[i], j, USB_MAXALTSETTING);
675 nalts[i] = j = USB_MAXALTSETTING;
678 len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
679 config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
682 kref_init(&intfc->ref);
685 /* FIXME: parse the BOS descriptor */
687 /* Skip over any Class Specific or Vendor Specific descriptors;
688 * find the first interface descriptor */
689 config->extra = buffer;
690 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
691 USB_DT_INTERFACE, &n);
692 config->extralen = i;
694 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
695 n, plural(n), "configuration");
699 /* Parse all the interface/altsetting descriptors */
701 retval = usb_parse_interface(ddev, cfgno, config,
702 buffer, size, inums, nalts);
710 /* Check for missing altsettings */
711 for (i = 0; i < nintf; ++i) {
712 intfc = config->intf_cache[i];
713 for (j = 0; j < intfc->num_altsetting; ++j) {
714 for (n = 0; n < intfc->num_altsetting; ++n) {
715 if (intfc->altsetting[n].desc.
716 bAlternateSetting == j)
719 if (n >= intfc->num_altsetting)
720 dev_warn(ddev, "config %d interface %d has no "
721 "altsetting %d\n", cfgno, inums[i], j);
728 /* hub-only!! ... and only exported for reset/reinit path.
729 * otherwise used internally on disconnect/destroy path
731 void usb_destroy_configuration(struct usb_device *dev)
738 if (dev->rawdescriptors) {
739 for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
740 kfree(dev->rawdescriptors[i]);
742 kfree(dev->rawdescriptors);
743 dev->rawdescriptors = NULL;
746 for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
747 struct usb_host_config *cf = &dev->config[c];
750 for (i = 0; i < cf->desc.bNumInterfaces; i++) {
751 if (cf->intf_cache[i])
752 kref_put(&cf->intf_cache[i]->ref,
753 usb_release_interface_cache);
762 * Get the USB config descriptors, cache and parse'em
764 * hub-only!! ... and only in reset path, or usb_new_device()
765 * (used by real hubs and virtual root hubs)
767 int usb_get_configuration(struct usb_device *dev)
769 struct device *ddev = &dev->dev;
770 int ncfg = dev->descriptor.bNumConfigurations;
772 unsigned int cfgno, length;
773 unsigned char *bigbuffer;
774 struct usb_config_descriptor *desc;
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 if (result != -EPIPE)
814 dev_err(ddev, "chopping to %d config(s)\n", cfgno);
815 dev->descriptor.bNumConfigurations = cfgno;
817 } else if (result < 4) {
818 dev_err(ddev, "config index %d descriptor too short "
819 "(expected %i, got %i)\n", cfgno,
820 USB_DT_CONFIG_SIZE, result);
824 length = max((int) le16_to_cpu(desc->wTotalLength),
827 /* Now that we know the length, get the whole thing */
828 bigbuffer = kmalloc(length, GFP_KERNEL);
834 if (dev->quirks & USB_QUIRK_DELAY_INIT)
837 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
840 dev_err(ddev, "unable to read config index %d "
841 "descriptor/%s\n", cfgno, "all");
845 if (result < length) {
846 dev_warn(ddev, "config index %d descriptor too short "
847 "(expected %i, got %i)\n", cfgno, length, result);
851 dev->rawdescriptors[cfgno] = bigbuffer;
853 result = usb_parse_configuration(dev, cfgno,
854 &dev->config[cfgno], bigbuffer, length);
864 dev->descriptor.bNumConfigurations = cfgno;
866 if (result == -ENOMEM)
867 dev_err(ddev, "out of memory\n");
871 void usb_release_bos_descriptor(struct usb_device *dev)
874 kfree(dev->bos->desc);
880 /* Get BOS descriptor set */
881 int usb_get_bos_descriptor(struct usb_device *dev)
883 struct device *ddev = &dev->dev;
884 struct usb_bos_descriptor *bos;
885 struct usb_dev_cap_header *cap;
886 unsigned char *buffer;
887 int length, total_len, num, i;
890 bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
894 /* Get BOS descriptor */
895 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, bos, USB_DT_BOS_SIZE);
896 if (ret < USB_DT_BOS_SIZE) {
897 dev_err(ddev, "unable to get BOS descriptor\n");
904 length = bos->bLength;
905 total_len = le16_to_cpu(bos->wTotalLength);
906 num = bos->bNumDeviceCaps;
908 if (total_len < length)
911 dev->bos = kzalloc(sizeof(struct usb_host_bos), GFP_KERNEL);
915 /* Now let's get the whole BOS descriptor set */
916 buffer = kzalloc(total_len, GFP_KERNEL);
921 dev->bos->desc = (struct usb_bos_descriptor *)buffer;
923 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, buffer, total_len);
924 if (ret < total_len) {
925 dev_err(ddev, "unable to get BOS descriptor set\n");
932 for (i = 0; i < num; i++) {
934 cap = (struct usb_dev_cap_header *)buffer;
935 length = cap->bLength;
937 if (total_len < length)
941 if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
942 dev_warn(ddev, "descriptor type invalid, skip\n");
946 switch (cap->bDevCapabilityType) {
947 case USB_CAP_TYPE_WIRELESS_USB:
948 /* Wireless USB cap descriptor is handled by wusb */
950 case USB_CAP_TYPE_EXT:
952 (struct usb_ext_cap_descriptor *)buffer;
954 case USB_SS_CAP_TYPE:
956 (struct usb_ss_cap_descriptor *)buffer;
958 case USB_SSP_CAP_TYPE:
960 (struct usb_ssp_cap_descriptor *)buffer;
962 case CONTAINER_ID_TYPE:
964 (struct usb_ss_container_id_descriptor *)buffer;
966 case USB_PTM_CAP_TYPE:
968 (struct usb_ptm_cap_descriptor *)buffer;
977 usb_release_bos_descriptor(dev);