1 // SPDX-License-Identifier: GPL-2.0
3 * Released under the GPLv2 only.
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_notice(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_notice(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_notice(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_notice(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_notice(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_notice(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_notice(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_notice(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,
195 /* Bulk should be 512, but some devices use 1024: we will warn below */
196 [USB_ENDPOINT_XFER_BULK] = 1024,
197 [USB_ENDPOINT_XFER_INT] = 1024,
199 static const unsigned short super_speed_maxpacket_maxes[4] = {
200 [USB_ENDPOINT_XFER_CONTROL] = 512,
201 [USB_ENDPOINT_XFER_ISOC] = 1024,
202 [USB_ENDPOINT_XFER_BULK] = 1024,
203 [USB_ENDPOINT_XFER_INT] = 1024,
206 static bool endpoint_is_duplicate(struct usb_endpoint_descriptor *e1,
207 struct usb_endpoint_descriptor *e2)
209 if (e1->bEndpointAddress == e2->bEndpointAddress)
212 if (usb_endpoint_xfer_control(e1) || usb_endpoint_xfer_control(e2)) {
213 if (usb_endpoint_num(e1) == usb_endpoint_num(e2))
221 * Check for duplicate endpoint addresses in other interfaces and in the
222 * altsetting currently being parsed.
224 static bool config_endpoint_is_duplicate(struct usb_host_config *config,
225 int inum, int asnum, struct usb_endpoint_descriptor *d)
227 struct usb_endpoint_descriptor *epd;
228 struct usb_interface_cache *intfc;
229 struct usb_host_interface *alt;
232 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
233 intfc = config->intf_cache[i];
235 for (j = 0; j < intfc->num_altsetting; ++j) {
236 alt = &intfc->altsetting[j];
238 if (alt->desc.bInterfaceNumber == inum &&
239 alt->desc.bAlternateSetting != asnum)
242 for (k = 0; k < alt->desc.bNumEndpoints; ++k) {
243 epd = &alt->endpoint[k].desc;
245 if (endpoint_is_duplicate(epd, d))
254 static int usb_parse_endpoint(struct device *ddev, int cfgno,
255 struct usb_host_config *config, int inum, int asnum,
256 struct usb_host_interface *ifp, int num_ep,
257 unsigned char *buffer, int size)
259 struct usb_device *udev = to_usb_device(ddev);
260 unsigned char *buffer0 = buffer;
261 struct usb_endpoint_descriptor *d;
262 struct usb_host_endpoint *endpoint;
265 const unsigned short *maxpacket_maxes;
267 d = (struct usb_endpoint_descriptor *) buffer;
268 buffer += d->bLength;
271 if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
272 n = USB_DT_ENDPOINT_AUDIO_SIZE;
273 else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
274 n = USB_DT_ENDPOINT_SIZE;
276 dev_notice(ddev, "config %d interface %d altsetting %d has an "
277 "invalid endpoint descriptor of length %d, skipping\n",
278 cfgno, inum, asnum, d->bLength);
279 goto skip_to_next_endpoint_or_interface_descriptor;
282 i = d->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
284 dev_notice(ddev, "config %d interface %d altsetting %d has an "
285 "invalid descriptor for endpoint zero, skipping\n",
287 goto skip_to_next_endpoint_or_interface_descriptor;
290 /* Only store as many endpoints as we have room for */
291 if (ifp->desc.bNumEndpoints >= num_ep)
292 goto skip_to_next_endpoint_or_interface_descriptor;
294 /* Save a copy of the descriptor and use it instead of the original */
295 endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
296 memcpy(&endpoint->desc, d, n);
299 /* Clear the reserved bits in bEndpointAddress */
300 i = d->bEndpointAddress &
301 (USB_ENDPOINT_DIR_MASK | USB_ENDPOINT_NUMBER_MASK);
302 if (i != d->bEndpointAddress) {
303 dev_notice(ddev, "config %d interface %d altsetting %d has an endpoint descriptor with address 0x%X, changing to 0x%X\n",
304 cfgno, inum, asnum, d->bEndpointAddress, i);
305 endpoint->desc.bEndpointAddress = i;
308 /* Check for duplicate endpoint addresses */
309 if (config_endpoint_is_duplicate(config, inum, asnum, d)) {
310 dev_notice(ddev, "config %d interface %d altsetting %d has a duplicate endpoint with address 0x%X, skipping\n",
311 cfgno, inum, asnum, d->bEndpointAddress);
312 goto skip_to_next_endpoint_or_interface_descriptor;
315 /* Ignore some endpoints */
316 if (udev->quirks & USB_QUIRK_ENDPOINT_IGNORE) {
317 if (usb_endpoint_is_ignored(udev, ifp, d)) {
318 dev_notice(ddev, "config %d interface %d altsetting %d has an ignored endpoint with address 0x%X, skipping\n",
320 d->bEndpointAddress);
321 goto skip_to_next_endpoint_or_interface_descriptor;
325 /* Accept this endpoint */
326 ++ifp->desc.bNumEndpoints;
327 INIT_LIST_HEAD(&endpoint->urb_list);
330 * Fix up bInterval values outside the legal range.
331 * Use 10 or 8 ms if no proper value can be guessed.
333 i = 0; /* i = min, j = max, n = default */
335 if (usb_endpoint_xfer_int(d)) {
337 switch (udev->speed) {
338 case USB_SPEED_SUPER_PLUS:
339 case USB_SPEED_SUPER:
342 * Many device manufacturers are using full-speed
343 * bInterval values in high-speed interrupt endpoint
344 * descriptors. Try to fix those and fall back to an
345 * 8-ms default value otherwise.
347 n = fls(d->bInterval*8);
349 n = 7; /* 8 ms = 2^(7-1) uframes */
353 * Adjust bInterval for quirked devices.
356 * This quirk fixes bIntervals reported in ms.
358 if (udev->quirks & USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL) {
359 n = clamp(fls(d->bInterval) + 3, i, j);
363 * This quirk fixes bIntervals reported in
364 * linear microframes.
366 if (udev->quirks & USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL) {
367 n = clamp(fls(d->bInterval), i, j);
371 default: /* USB_SPEED_FULL or _LOW */
373 * For low-speed, 10 ms is the official minimum.
374 * But some "overclocked" devices might want faster
375 * polling so we'll allow it.
380 } else if (usb_endpoint_xfer_isoc(d)) {
383 switch (udev->speed) {
385 n = 7; /* 8 ms = 2^(7-1) uframes */
387 default: /* USB_SPEED_FULL */
388 n = 4; /* 8 ms = 2^(4-1) frames */
392 if (d->bInterval < i || d->bInterval > j) {
393 dev_notice(ddev, "config %d interface %d altsetting %d "
394 "endpoint 0x%X has an invalid bInterval %d, "
397 d->bEndpointAddress, d->bInterval, n);
398 endpoint->desc.bInterval = n;
401 /* Some buggy low-speed devices have Bulk endpoints, which is
402 * explicitly forbidden by the USB spec. In an attempt to make
403 * them usable, we will try treating them as Interrupt endpoints.
405 if (udev->speed == USB_SPEED_LOW && usb_endpoint_xfer_bulk(d)) {
406 dev_notice(ddev, "config %d interface %d altsetting %d "
407 "endpoint 0x%X is Bulk; changing to Interrupt\n",
408 cfgno, inum, asnum, d->bEndpointAddress);
409 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
410 endpoint->desc.bInterval = 1;
411 if (usb_endpoint_maxp(&endpoint->desc) > 8)
412 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
416 * Validate the wMaxPacketSize field.
417 * Some devices have isochronous endpoints in altsetting 0;
418 * the USB-2 spec requires such endpoints to have wMaxPacketSize = 0
419 * (see the end of section 5.6.3), so don't warn about them.
421 maxp = le16_to_cpu(endpoint->desc.wMaxPacketSize);
422 if (maxp == 0 && !(usb_endpoint_xfer_isoc(d) && asnum == 0)) {
423 dev_notice(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid wMaxPacketSize 0\n",
424 cfgno, inum, asnum, d->bEndpointAddress);
427 /* Find the highest legal maxpacket size for this endpoint */
428 i = 0; /* additional transactions per microframe */
429 switch (udev->speed) {
431 maxpacket_maxes = low_speed_maxpacket_maxes;
434 maxpacket_maxes = full_speed_maxpacket_maxes;
437 /* Multiple-transactions bits are allowed only for HS periodic endpoints */
438 if (usb_endpoint_xfer_int(d) || usb_endpoint_xfer_isoc(d)) {
439 i = maxp & USB_EP_MAXP_MULT_MASK;
444 maxpacket_maxes = high_speed_maxpacket_maxes;
446 case USB_SPEED_SUPER:
447 case USB_SPEED_SUPER_PLUS:
448 maxpacket_maxes = super_speed_maxpacket_maxes;
451 j = maxpacket_maxes[usb_endpoint_type(&endpoint->desc)];
454 dev_notice(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid maxpacket %d, setting to %d\n",
455 cfgno, inum, asnum, d->bEndpointAddress, maxp, j);
457 endpoint->desc.wMaxPacketSize = cpu_to_le16(i | maxp);
461 * Some buggy high speed devices have bulk endpoints using
462 * maxpacket sizes other than 512. High speed HCDs may not
463 * be able to handle that particular bug, so let's warn...
465 if (udev->speed == USB_SPEED_HIGH && usb_endpoint_xfer_bulk(d)) {
467 dev_notice(ddev, "config %d interface %d altsetting %d "
468 "bulk endpoint 0x%X has invalid maxpacket %d\n",
469 cfgno, inum, asnum, d->bEndpointAddress,
473 /* Parse a possible SuperSpeed endpoint companion descriptor */
474 if (udev->speed >= USB_SPEED_SUPER)
475 usb_parse_ss_endpoint_companion(ddev, cfgno,
476 inum, asnum, endpoint, buffer, size);
478 /* Skip over any Class Specific or Vendor Specific descriptors;
479 * find the next endpoint or interface descriptor */
480 endpoint->extra = buffer;
481 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
482 USB_DT_INTERFACE, &n);
483 endpoint->extralen = i;
484 retval = buffer - buffer0 + i;
486 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
487 n, plural(n), "endpoint");
490 skip_to_next_endpoint_or_interface_descriptor:
491 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
492 USB_DT_INTERFACE, NULL);
493 return buffer - buffer0 + i;
496 void usb_release_interface_cache(struct kref *ref)
498 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
501 for (j = 0; j < intfc->num_altsetting; j++) {
502 struct usb_host_interface *alt = &intfc->altsetting[j];
504 kfree(alt->endpoint);
510 static int usb_parse_interface(struct device *ddev, int cfgno,
511 struct usb_host_config *config, unsigned char *buffer, int size,
512 u8 inums[], u8 nalts[])
514 unsigned char *buffer0 = buffer;
515 struct usb_interface_descriptor *d;
517 struct usb_interface_cache *intfc;
518 struct usb_host_interface *alt;
521 int num_ep, num_ep_orig;
523 d = (struct usb_interface_descriptor *) buffer;
524 buffer += d->bLength;
527 if (d->bLength < USB_DT_INTERFACE_SIZE)
528 goto skip_to_next_interface_descriptor;
530 /* Which interface entry is this? */
532 inum = d->bInterfaceNumber;
533 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
534 if (inums[i] == inum) {
535 intfc = config->intf_cache[i];
539 if (!intfc || intfc->num_altsetting >= nalts[i])
540 goto skip_to_next_interface_descriptor;
542 /* Check for duplicate altsetting entries */
543 asnum = d->bAlternateSetting;
544 for ((i = 0, alt = &intfc->altsetting[0]);
545 i < intfc->num_altsetting;
547 if (alt->desc.bAlternateSetting == asnum) {
548 dev_notice(ddev, "Duplicate descriptor for config %d "
549 "interface %d altsetting %d, skipping\n",
551 goto skip_to_next_interface_descriptor;
555 ++intfc->num_altsetting;
556 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
558 /* Skip over any Class Specific or Vendor Specific descriptors;
559 * find the first endpoint or interface descriptor */
561 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
562 USB_DT_INTERFACE, &n);
565 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
566 n, plural(n), "interface");
570 /* Allocate space for the right(?) number of endpoints */
571 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
572 alt->desc.bNumEndpoints = 0; /* Use as a counter */
573 if (num_ep > USB_MAXENDPOINTS) {
574 dev_notice(ddev, "too many endpoints for config %d interface %d "
575 "altsetting %d: %d, using maximum allowed: %d\n",
576 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
577 num_ep = USB_MAXENDPOINTS;
581 /* Can't allocate 0 bytes */
582 len = sizeof(struct usb_host_endpoint) * num_ep;
583 alt->endpoint = kzalloc(len, GFP_KERNEL);
588 /* Parse all the endpoint descriptors */
591 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
594 retval = usb_parse_endpoint(ddev, cfgno, config, inum, asnum,
595 alt, num_ep, buffer, size);
604 if (n != num_ep_orig)
605 dev_notice(ddev, "config %d interface %d altsetting %d has %d "
606 "endpoint descriptor%s, different from the interface "
607 "descriptor's value: %d\n",
608 cfgno, inum, asnum, n, plural(n), num_ep_orig);
609 return buffer - buffer0;
611 skip_to_next_interface_descriptor:
612 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
613 USB_DT_INTERFACE, NULL);
614 return buffer - buffer0 + i;
617 static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
618 struct usb_host_config *config, unsigned char *buffer, int size)
620 struct device *ddev = &dev->dev;
621 unsigned char *buffer0 = buffer;
623 int nintf, nintf_orig;
625 struct usb_interface_cache *intfc;
626 unsigned char *buffer2;
628 struct usb_descriptor_header *header;
630 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
631 unsigned iad_num = 0;
633 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
634 nintf = nintf_orig = config->desc.bNumInterfaces;
635 config->desc.bNumInterfaces = 0; // Adjusted later
637 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
638 config->desc.bLength < USB_DT_CONFIG_SIZE ||
639 config->desc.bLength > size) {
640 dev_notice(ddev, "invalid descriptor for config index %d: "
641 "type = 0x%X, length = %d\n", cfgidx,
642 config->desc.bDescriptorType, config->desc.bLength);
645 cfgno = config->desc.bConfigurationValue;
647 buffer += config->desc.bLength;
648 size -= config->desc.bLength;
650 if (nintf > USB_MAXINTERFACES) {
651 dev_notice(ddev, "config %d has too many interfaces: %d, "
652 "using maximum allowed: %d\n",
653 cfgno, nintf, USB_MAXINTERFACES);
654 nintf = USB_MAXINTERFACES;
657 /* Go through the descriptors, checking their length and counting the
658 * number of altsettings for each interface */
660 for ((buffer2 = buffer, size2 = size);
662 (buffer2 += header->bLength, size2 -= header->bLength)) {
664 if (size2 < sizeof(struct usb_descriptor_header)) {
665 dev_notice(ddev, "config %d descriptor has %d excess "
666 "byte%s, ignoring\n",
667 cfgno, size2, plural(size2));
671 header = (struct usb_descriptor_header *) buffer2;
672 if ((header->bLength > size2) || (header->bLength < 2)) {
673 dev_notice(ddev, "config %d has an invalid descriptor "
674 "of length %d, skipping remainder of the config\n",
675 cfgno, header->bLength);
679 if (header->bDescriptorType == USB_DT_INTERFACE) {
680 struct usb_interface_descriptor *d;
683 d = (struct usb_interface_descriptor *) header;
684 if (d->bLength < USB_DT_INTERFACE_SIZE) {
685 dev_notice(ddev, "config %d has an invalid "
686 "interface descriptor of length %d, "
687 "skipping\n", cfgno, d->bLength);
691 inum = d->bInterfaceNumber;
693 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
695 dev_notice(ddev, "config %d has more interface "
696 "descriptors, than it declares in "
697 "bNumInterfaces, ignoring interface "
698 "number: %d\n", cfgno, inum);
702 if (inum >= nintf_orig)
703 dev_notice(ddev, "config %d has an invalid "
704 "interface number: %d but max is %d\n",
705 cfgno, inum, nintf_orig - 1);
707 /* Have we already encountered this interface?
708 * Count its altsettings */
709 for (i = 0; i < n; ++i) {
710 if (inums[i] == inum)
716 } else if (n < USB_MAXINTERFACES) {
722 } else if (header->bDescriptorType ==
723 USB_DT_INTERFACE_ASSOCIATION) {
724 struct usb_interface_assoc_descriptor *d;
726 d = (struct usb_interface_assoc_descriptor *)header;
727 if (d->bLength < USB_DT_INTERFACE_ASSOCIATION_SIZE) {
729 "config %d has an invalid interface association descriptor of length %d, skipping\n",
734 if (iad_num == USB_MAXIADS) {
735 dev_notice(ddev, "found more Interface "
736 "Association Descriptors "
737 "than allocated for in "
738 "configuration %d\n", cfgno);
740 config->intf_assoc[iad_num] = d;
744 } else if (header->bDescriptorType == USB_DT_DEVICE ||
745 header->bDescriptorType == USB_DT_CONFIG)
746 dev_notice(ddev, "config %d contains an unexpected "
747 "descriptor of type 0x%X, skipping\n",
748 cfgno, header->bDescriptorType);
750 } /* for ((buffer2 = buffer, size2 = size); ...) */
751 size = buffer2 - buffer;
752 config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
755 dev_notice(ddev, "config %d has %d interface%s, different from "
756 "the descriptor's value: %d\n",
757 cfgno, n, plural(n), nintf_orig);
759 dev_notice(ddev, "config %d has no interfaces?\n", cfgno);
760 config->desc.bNumInterfaces = nintf = n;
762 /* Check for missing interface numbers */
763 for (i = 0; i < nintf; ++i) {
764 for (j = 0; j < nintf; ++j) {
769 dev_notice(ddev, "config %d has no interface number "
773 /* Allocate the usb_interface_caches and altsetting arrays */
774 for (i = 0; i < nintf; ++i) {
776 if (j > USB_MAXALTSETTING) {
777 dev_notice(ddev, "too many alternate settings for "
778 "config %d interface %d: %d, "
779 "using maximum allowed: %d\n",
780 cfgno, inums[i], j, USB_MAXALTSETTING);
781 nalts[i] = j = USB_MAXALTSETTING;
784 intfc = kzalloc(struct_size(intfc, altsetting, j), GFP_KERNEL);
785 config->intf_cache[i] = intfc;
788 kref_init(&intfc->ref);
791 /* FIXME: parse the BOS descriptor */
793 /* Skip over any Class Specific or Vendor Specific descriptors;
794 * find the first interface descriptor */
795 config->extra = buffer;
796 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
797 USB_DT_INTERFACE, &n);
798 config->extralen = i;
800 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
801 n, plural(n), "configuration");
805 /* Parse all the interface/altsetting descriptors */
807 retval = usb_parse_interface(ddev, cfgno, config,
808 buffer, size, inums, nalts);
816 /* Check for missing altsettings */
817 for (i = 0; i < nintf; ++i) {
818 intfc = config->intf_cache[i];
819 for (j = 0; j < intfc->num_altsetting; ++j) {
820 for (n = 0; n < intfc->num_altsetting; ++n) {
821 if (intfc->altsetting[n].desc.
822 bAlternateSetting == j)
825 if (n >= intfc->num_altsetting)
826 dev_notice(ddev, "config %d interface %d has no "
827 "altsetting %d\n", cfgno, inums[i], j);
834 /* hub-only!! ... and only exported for reset/reinit path.
835 * otherwise used internally on disconnect/destroy path
837 void usb_destroy_configuration(struct usb_device *dev)
844 if (dev->rawdescriptors) {
845 for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
846 kfree(dev->rawdescriptors[i]);
848 kfree(dev->rawdescriptors);
849 dev->rawdescriptors = NULL;
852 for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
853 struct usb_host_config *cf = &dev->config[c];
856 for (i = 0; i < cf->desc.bNumInterfaces; i++) {
857 if (cf->intf_cache[i])
858 kref_put(&cf->intf_cache[i]->ref,
859 usb_release_interface_cache);
868 * Get the USB config descriptors, cache and parse'em
870 * hub-only!! ... and only in reset path, or usb_new_device()
871 * (used by real hubs and virtual root hubs)
873 int usb_get_configuration(struct usb_device *dev)
875 struct device *ddev = &dev->dev;
876 int ncfg = dev->descriptor.bNumConfigurations;
877 unsigned int cfgno, length;
878 unsigned char *bigbuffer;
879 struct usb_config_descriptor *desc;
882 if (ncfg > USB_MAXCONFIG) {
883 dev_notice(ddev, "too many configurations: %d, "
884 "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
885 dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
889 dev_err(ddev, "no configurations\n");
893 length = ncfg * sizeof(struct usb_host_config);
894 dev->config = kzalloc(length, GFP_KERNEL);
898 length = ncfg * sizeof(char *);
899 dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
900 if (!dev->rawdescriptors)
903 desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
907 for (cfgno = 0; cfgno < ncfg; cfgno++) {
908 /* We grab just the first descriptor so we know how long
909 * the whole configuration is */
910 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
911 desc, USB_DT_CONFIG_SIZE);
913 dev_err(ddev, "unable to read config index %d "
914 "descriptor/%s: %d\n", cfgno, "start", result);
915 if (result != -EPIPE)
917 dev_notice(ddev, "chopping to %d config(s)\n", cfgno);
918 dev->descriptor.bNumConfigurations = cfgno;
920 } else if (result < 4) {
921 dev_err(ddev, "config index %d descriptor too short "
922 "(expected %i, got %i)\n", cfgno,
923 USB_DT_CONFIG_SIZE, result);
927 length = max((int) le16_to_cpu(desc->wTotalLength),
930 /* Now that we know the length, get the whole thing */
931 bigbuffer = kmalloc(length, GFP_KERNEL);
937 if (dev->quirks & USB_QUIRK_DELAY_INIT)
940 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
943 dev_err(ddev, "unable to read config index %d "
944 "descriptor/%s\n", cfgno, "all");
948 if (result < length) {
949 dev_notice(ddev, "config index %d descriptor too short "
950 "(expected %i, got %i)\n", cfgno, length, result);
954 dev->rawdescriptors[cfgno] = bigbuffer;
956 result = usb_parse_configuration(dev, cfgno,
957 &dev->config[cfgno], bigbuffer, length);
966 dev->descriptor.bNumConfigurations = cfgno;
971 void usb_release_bos_descriptor(struct usb_device *dev)
974 kfree(dev->bos->desc);
980 static const __u8 bos_desc_len[256] = {
981 [USB_CAP_TYPE_WIRELESS_USB] = USB_DT_USB_WIRELESS_CAP_SIZE,
982 [USB_CAP_TYPE_EXT] = USB_DT_USB_EXT_CAP_SIZE,
983 [USB_SS_CAP_TYPE] = USB_DT_USB_SS_CAP_SIZE,
984 [USB_SSP_CAP_TYPE] = USB_DT_USB_SSP_CAP_SIZE(1),
985 [CONTAINER_ID_TYPE] = USB_DT_USB_SS_CONTN_ID_SIZE,
986 [USB_PTM_CAP_TYPE] = USB_DT_USB_PTM_ID_SIZE,
989 /* Get BOS descriptor set */
990 int usb_get_bos_descriptor(struct usb_device *dev)
992 struct device *ddev = &dev->dev;
993 struct usb_bos_descriptor *bos;
994 struct usb_dev_cap_header *cap;
995 struct usb_ssp_cap_descriptor *ssp_cap;
996 unsigned char *buffer, *buffer0;
997 int length, total_len, num, i, ssac;
1001 bos = kzalloc(sizeof(*bos), GFP_KERNEL);
1005 /* Get BOS descriptor */
1006 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, bos, USB_DT_BOS_SIZE);
1007 if (ret < USB_DT_BOS_SIZE || bos->bLength < USB_DT_BOS_SIZE) {
1008 dev_notice(ddev, "unable to get BOS descriptor or descriptor too short\n");
1015 length = bos->bLength;
1016 total_len = le16_to_cpu(bos->wTotalLength);
1017 num = bos->bNumDeviceCaps;
1019 if (total_len < length)
1022 dev->bos = kzalloc(sizeof(*dev->bos), GFP_KERNEL);
1026 /* Now let's get the whole BOS descriptor set */
1027 buffer = kzalloc(total_len, GFP_KERNEL);
1032 dev->bos->desc = (struct usb_bos_descriptor *)buffer;
1034 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, buffer, total_len);
1035 if (ret < total_len) {
1036 dev_notice(ddev, "unable to get BOS descriptor set\n");
1043 total_len -= length;
1046 for (i = 0; i < num; i++) {
1047 cap = (struct usb_dev_cap_header *)buffer;
1049 if (total_len < sizeof(*cap) || total_len < cap->bLength) {
1050 dev->bos->desc->bNumDeviceCaps = i;
1053 cap_type = cap->bDevCapabilityType;
1054 length = cap->bLength;
1055 if (bos_desc_len[cap_type] && length < bos_desc_len[cap_type]) {
1056 dev->bos->desc->bNumDeviceCaps = i;
1060 if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
1061 dev_notice(ddev, "descriptor type invalid, skip\n");
1062 goto skip_to_next_descriptor;
1066 case USB_CAP_TYPE_EXT:
1068 (struct usb_ext_cap_descriptor *)buffer;
1070 case USB_SS_CAP_TYPE:
1072 (struct usb_ss_cap_descriptor *)buffer;
1074 case USB_SSP_CAP_TYPE:
1075 ssp_cap = (struct usb_ssp_cap_descriptor *)buffer;
1076 ssac = (le32_to_cpu(ssp_cap->bmAttributes) &
1077 USB_SSP_SUBLINK_SPEED_ATTRIBS);
1078 if (length >= USB_DT_USB_SSP_CAP_SIZE(ssac))
1079 dev->bos->ssp_cap = ssp_cap;
1081 case CONTAINER_ID_TYPE:
1083 (struct usb_ss_container_id_descriptor *)buffer;
1085 case USB_PTM_CAP_TYPE:
1087 (struct usb_ptm_cap_descriptor *)buffer;
1093 skip_to_next_descriptor:
1094 total_len -= length;
1097 dev->bos->desc->wTotalLength = cpu_to_le16(buffer - buffer0);
1102 usb_release_bos_descriptor(dev);