2 #include <linux/usb/ch9.h>
3 #include <linux/usb/hcd.h>
4 #include <linux/usb/quirks.h>
5 #include <linux/module.h>
6 #include <linux/slab.h>
7 #include <linux/device.h>
8 #include <asm/byteorder.h>
12 #define USB_MAXALTSETTING 128 /* Hard limit */
14 #define USB_MAXCONFIG 8 /* Arbitrary limit */
17 static inline const char *plural(int n)
19 return (n == 1 ? "" : "s");
22 static int find_next_descriptor(unsigned char *buffer, int size,
23 int dt1, int dt2, int *num_skipped)
25 struct usb_descriptor_header *h;
27 unsigned char *buffer0 = buffer;
29 /* Find the next descriptor of type dt1 or dt2 */
31 h = (struct usb_descriptor_header *) buffer;
32 if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
39 /* Store the number of descriptors skipped and return the
40 * number of bytes skipped */
43 return buffer - buffer0;
46 static void usb_parse_ssp_isoc_endpoint_companion(struct device *ddev,
47 int cfgno, int inum, int asnum, struct usb_host_endpoint *ep,
48 unsigned char *buffer, int size)
50 struct usb_ssp_isoc_ep_comp_descriptor *desc;
53 * The SuperSpeedPlus Isoc endpoint companion descriptor immediately
54 * follows the SuperSpeed Endpoint Companion descriptor
56 desc = (struct usb_ssp_isoc_ep_comp_descriptor *) buffer;
57 if (desc->bDescriptorType != USB_DT_SSP_ISOC_ENDPOINT_COMP ||
58 size < USB_DT_SSP_ISOC_EP_COMP_SIZE) {
59 dev_warn(ddev, "Invalid SuperSpeedPlus isoc endpoint companion"
60 "for config %d interface %d altsetting %d ep %d.\n",
61 cfgno, inum, asnum, ep->desc.bEndpointAddress);
64 memcpy(&ep->ssp_isoc_ep_comp, desc, USB_DT_SSP_ISOC_EP_COMP_SIZE);
67 static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
68 int inum, int asnum, struct usb_host_endpoint *ep,
69 unsigned char *buffer, int size)
71 struct usb_ss_ep_comp_descriptor *desc;
74 /* The SuperSpeed endpoint companion descriptor is supposed to
75 * be the first thing immediately following the endpoint descriptor.
77 desc = (struct usb_ss_ep_comp_descriptor *) buffer;
79 if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP ||
80 size < USB_DT_SS_EP_COMP_SIZE) {
81 dev_warn(ddev, "No SuperSpeed endpoint companion for config %d "
82 " interface %d altsetting %d ep %d: "
83 "using minimum values\n",
84 cfgno, inum, asnum, ep->desc.bEndpointAddress);
86 /* Fill in some default values.
87 * Leave bmAttributes as zero, which will mean no streams for
88 * bulk, and isoc won't support multiple bursts of packets.
89 * With bursts of only one packet, and a Mult of 1, the max
90 * amount of data moved per endpoint service interval is one
93 ep->ss_ep_comp.bLength = USB_DT_SS_EP_COMP_SIZE;
94 ep->ss_ep_comp.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
95 if (usb_endpoint_xfer_isoc(&ep->desc) ||
96 usb_endpoint_xfer_int(&ep->desc))
97 ep->ss_ep_comp.wBytesPerInterval =
98 ep->desc.wMaxPacketSize;
101 buffer += desc->bLength;
102 size -= desc->bLength;
103 memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE);
105 /* Check the various values */
106 if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) {
107 dev_warn(ddev, "Control endpoint with bMaxBurst = %d in "
108 "config %d interface %d altsetting %d ep %d: "
109 "setting to zero\n", desc->bMaxBurst,
110 cfgno, inum, asnum, ep->desc.bEndpointAddress);
111 ep->ss_ep_comp.bMaxBurst = 0;
112 } else if (desc->bMaxBurst > 15) {
113 dev_warn(ddev, "Endpoint with bMaxBurst = %d in "
114 "config %d interface %d altsetting %d ep %d: "
115 "setting to 15\n", desc->bMaxBurst,
116 cfgno, inum, asnum, ep->desc.bEndpointAddress);
117 ep->ss_ep_comp.bMaxBurst = 15;
120 if ((usb_endpoint_xfer_control(&ep->desc) ||
121 usb_endpoint_xfer_int(&ep->desc)) &&
122 desc->bmAttributes != 0) {
123 dev_warn(ddev, "%s endpoint with bmAttributes = %d in "
124 "config %d interface %d altsetting %d ep %d: "
126 usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
128 cfgno, inum, asnum, ep->desc.bEndpointAddress);
129 ep->ss_ep_comp.bmAttributes = 0;
130 } else if (usb_endpoint_xfer_bulk(&ep->desc) &&
131 desc->bmAttributes > 16) {
132 dev_warn(ddev, "Bulk endpoint with more than 65536 streams in "
133 "config %d interface %d altsetting %d ep %d: "
135 cfgno, inum, asnum, ep->desc.bEndpointAddress);
136 ep->ss_ep_comp.bmAttributes = 16;
137 } else if (usb_endpoint_xfer_isoc(&ep->desc) &&
138 !USB_SS_SSP_ISOC_COMP(desc->bmAttributes) &&
139 USB_SS_MULT(desc->bmAttributes) > 3) {
140 dev_warn(ddev, "Isoc endpoint has Mult of %d in "
141 "config %d interface %d altsetting %d ep %d: "
143 USB_SS_MULT(desc->bmAttributes),
144 cfgno, inum, asnum, ep->desc.bEndpointAddress);
145 ep->ss_ep_comp.bmAttributes = 2;
148 if (usb_endpoint_xfer_isoc(&ep->desc))
149 max_tx = (desc->bMaxBurst + 1) *
150 (USB_SS_MULT(desc->bmAttributes)) *
151 usb_endpoint_maxp(&ep->desc);
152 else if (usb_endpoint_xfer_int(&ep->desc))
153 max_tx = usb_endpoint_maxp(&ep->desc) *
154 (desc->bMaxBurst + 1);
157 if (le16_to_cpu(desc->wBytesPerInterval) > max_tx) {
158 dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
159 "config %d interface %d altsetting %d ep %d: "
161 usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
162 le16_to_cpu(desc->wBytesPerInterval),
163 cfgno, inum, asnum, ep->desc.bEndpointAddress,
165 ep->ss_ep_comp.wBytesPerInterval = cpu_to_le16(max_tx);
167 /* Parse a possible SuperSpeedPlus isoc ep companion descriptor */
168 if (usb_endpoint_xfer_isoc(&ep->desc) &&
169 USB_SS_SSP_ISOC_COMP(desc->bmAttributes))
170 usb_parse_ssp_isoc_endpoint_companion(ddev, cfgno, inum, asnum,
174 static const unsigned short low_speed_maxpacket_maxes[4] = {
175 [USB_ENDPOINT_XFER_CONTROL] = 8,
176 [USB_ENDPOINT_XFER_ISOC] = 0,
177 [USB_ENDPOINT_XFER_BULK] = 0,
178 [USB_ENDPOINT_XFER_INT] = 8,
180 static const unsigned short full_speed_maxpacket_maxes[4] = {
181 [USB_ENDPOINT_XFER_CONTROL] = 64,
182 [USB_ENDPOINT_XFER_ISOC] = 1023,
183 [USB_ENDPOINT_XFER_BULK] = 64,
184 [USB_ENDPOINT_XFER_INT] = 64,
186 static const unsigned short high_speed_maxpacket_maxes[4] = {
187 [USB_ENDPOINT_XFER_CONTROL] = 64,
188 [USB_ENDPOINT_XFER_ISOC] = 1024,
190 /* Bulk should be 512, but some devices use 1024: we will warn below */
191 [USB_ENDPOINT_XFER_BULK] = 1024,
192 [USB_ENDPOINT_XFER_INT] = 1024,
194 static const unsigned short super_speed_maxpacket_maxes[4] = {
195 [USB_ENDPOINT_XFER_CONTROL] = 512,
196 [USB_ENDPOINT_XFER_ISOC] = 1024,
197 [USB_ENDPOINT_XFER_BULK] = 1024,
198 [USB_ENDPOINT_XFER_INT] = 1024,
201 static bool endpoint_is_duplicate(struct usb_endpoint_descriptor *e1,
202 struct usb_endpoint_descriptor *e2)
204 if (e1->bEndpointAddress == e2->bEndpointAddress)
207 if (usb_endpoint_xfer_control(e1) || usb_endpoint_xfer_control(e2)) {
208 if (usb_endpoint_num(e1) == usb_endpoint_num(e2))
216 * Check for duplicate endpoint addresses in other interfaces and in the
217 * altsetting currently being parsed.
219 static bool config_endpoint_is_duplicate(struct usb_host_config *config,
220 int inum, int asnum, struct usb_endpoint_descriptor *d)
222 struct usb_endpoint_descriptor *epd;
223 struct usb_interface_cache *intfc;
224 struct usb_host_interface *alt;
227 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
228 intfc = config->intf_cache[i];
230 for (j = 0; j < intfc->num_altsetting; ++j) {
231 alt = &intfc->altsetting[j];
233 if (alt->desc.bInterfaceNumber == inum &&
234 alt->desc.bAlternateSetting != asnum)
237 for (k = 0; k < alt->desc.bNumEndpoints; ++k) {
238 epd = &alt->endpoint[k].desc;
240 if (endpoint_is_duplicate(epd, d))
249 static int usb_parse_endpoint(struct device *ddev, int cfgno,
250 struct usb_host_config *config, int inum, int asnum,
251 struct usb_host_interface *ifp, int num_ep,
252 unsigned char *buffer, int size)
254 struct usb_device *udev = to_usb_device(ddev);
255 unsigned char *buffer0 = buffer;
256 struct usb_endpoint_descriptor *d;
257 struct usb_host_endpoint *endpoint;
260 const unsigned short *maxpacket_maxes;
262 d = (struct usb_endpoint_descriptor *) buffer;
263 buffer += d->bLength;
266 if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
267 n = USB_DT_ENDPOINT_AUDIO_SIZE;
268 else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
269 n = USB_DT_ENDPOINT_SIZE;
271 dev_warn(ddev, "config %d interface %d altsetting %d has an "
272 "invalid endpoint descriptor of length %d, skipping\n",
273 cfgno, inum, asnum, d->bLength);
274 goto skip_to_next_endpoint_or_interface_descriptor;
277 i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK;
278 if (i >= 16 || i == 0) {
279 dev_warn(ddev, "config %d interface %d altsetting %d has an "
280 "invalid endpoint with address 0x%X, skipping\n",
281 cfgno, inum, asnum, d->bEndpointAddress);
282 goto skip_to_next_endpoint_or_interface_descriptor;
285 /* Only store as many endpoints as we have room for */
286 if (ifp->desc.bNumEndpoints >= num_ep)
287 goto skip_to_next_endpoint_or_interface_descriptor;
289 /* Check for duplicate endpoint addresses */
290 if (config_endpoint_is_duplicate(config, inum, asnum, d)) {
291 dev_warn(ddev, "config %d interface %d altsetting %d has a duplicate endpoint with address 0x%X, skipping\n",
292 cfgno, inum, asnum, d->bEndpointAddress);
293 goto skip_to_next_endpoint_or_interface_descriptor;
296 /* Ignore blacklisted endpoints */
297 if (udev->quirks & USB_QUIRK_ENDPOINT_BLACKLIST) {
298 if (usb_endpoint_is_blacklisted(udev, ifp, d)) {
299 dev_warn(ddev, "config %d interface %d altsetting %d has a blacklisted endpoint with address 0x%X, skipping\n",
301 d->bEndpointAddress);
302 goto skip_to_next_endpoint_or_interface_descriptor;
306 endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
307 ++ifp->desc.bNumEndpoints;
309 memcpy(&endpoint->desc, d, n);
310 INIT_LIST_HEAD(&endpoint->urb_list);
313 * Fix up bInterval values outside the legal range.
314 * Use 10 or 8 ms if no proper value can be guessed.
316 i = 0; /* i = min, j = max, n = default */
318 if (usb_endpoint_xfer_int(d)) {
320 switch (to_usb_device(ddev)->speed) {
321 case USB_SPEED_SUPER_PLUS:
322 case USB_SPEED_SUPER:
325 * Many device manufacturers are using full-speed
326 * bInterval values in high-speed interrupt endpoint
327 * descriptors. Try to fix those and fall back to an
328 * 8-ms default value otherwise.
330 n = fls(d->bInterval*8);
332 n = 7; /* 8 ms = 2^(7-1) uframes */
336 * Adjust bInterval for quirked devices.
339 * This quirk fixes bIntervals reported in ms.
341 if (to_usb_device(ddev)->quirks &
342 USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL) {
343 n = clamp(fls(d->bInterval) + 3, i, j);
347 * This quirk fixes bIntervals reported in
348 * linear microframes.
350 if (to_usb_device(ddev)->quirks &
351 USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL) {
352 n = clamp(fls(d->bInterval), i, j);
356 default: /* USB_SPEED_FULL or _LOW */
358 * For low-speed, 10 ms is the official minimum.
359 * But some "overclocked" devices might want faster
360 * polling so we'll allow it.
365 } else if (usb_endpoint_xfer_isoc(d)) {
368 switch (to_usb_device(ddev)->speed) {
370 n = 7; /* 8 ms = 2^(7-1) uframes */
372 default: /* USB_SPEED_FULL */
373 n = 4; /* 8 ms = 2^(4-1) frames */
377 if (d->bInterval < i || d->bInterval > j) {
378 dev_warn(ddev, "config %d interface %d altsetting %d "
379 "endpoint 0x%X has an invalid bInterval %d, "
382 d->bEndpointAddress, d->bInterval, n);
383 endpoint->desc.bInterval = n;
386 /* Some buggy low-speed devices have Bulk endpoints, which is
387 * explicitly forbidden by the USB spec. In an attempt to make
388 * them usable, we will try treating them as Interrupt endpoints.
390 if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
391 usb_endpoint_xfer_bulk(d)) {
392 dev_warn(ddev, "config %d interface %d altsetting %d "
393 "endpoint 0x%X is Bulk; changing to Interrupt\n",
394 cfgno, inum, asnum, d->bEndpointAddress);
395 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
396 endpoint->desc.bInterval = 1;
397 if (usb_endpoint_maxp(&endpoint->desc) > 8)
398 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
402 * Validate the wMaxPacketSize field.
403 * Some devices have isochronous endpoints in altsetting 0;
404 * the USB-2 spec requires such endpoints to have wMaxPacketSize = 0
405 * (see the end of section 5.6.3), so don't warn about them.
407 maxp = le16_to_cpu(endpoint->desc.wMaxPacketSize);
408 if (maxp == 0 && !(usb_endpoint_xfer_isoc(d) && asnum == 0)) {
409 dev_warn(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid wMaxPacketSize 0\n",
410 cfgno, inum, asnum, d->bEndpointAddress);
413 /* Find the highest legal maxpacket size for this endpoint */
414 i = 0; /* additional transactions per microframe */
415 switch (to_usb_device(ddev)->speed) {
417 maxpacket_maxes = low_speed_maxpacket_maxes;
420 maxpacket_maxes = full_speed_maxpacket_maxes;
423 /* Multiple-transactions bits are allowed only for HS periodic endpoints */
424 if (usb_endpoint_xfer_int(d) || usb_endpoint_xfer_isoc(d)) {
425 i = maxp & USB_EP_MAXP_MULT_MASK;
430 maxpacket_maxes = high_speed_maxpacket_maxes;
432 case USB_SPEED_SUPER:
433 case USB_SPEED_SUPER_PLUS:
434 maxpacket_maxes = super_speed_maxpacket_maxes;
437 j = maxpacket_maxes[usb_endpoint_type(&endpoint->desc)];
440 dev_warn(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid maxpacket %d, setting to %d\n",
441 cfgno, inum, asnum, d->bEndpointAddress, maxp, j);
443 endpoint->desc.wMaxPacketSize = cpu_to_le16(i | maxp);
447 * Some buggy high speed devices have bulk endpoints using
448 * maxpacket sizes other than 512. High speed HCDs may not
449 * be able to handle that particular bug, so let's warn...
451 if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
452 && usb_endpoint_xfer_bulk(d)) {
454 dev_warn(ddev, "config %d interface %d altsetting %d "
455 "bulk endpoint 0x%X has invalid maxpacket %d\n",
456 cfgno, inum, asnum, d->bEndpointAddress,
460 /* Parse a possible SuperSpeed endpoint companion descriptor */
461 if (to_usb_device(ddev)->speed >= USB_SPEED_SUPER)
462 usb_parse_ss_endpoint_companion(ddev, cfgno,
463 inum, asnum, endpoint, buffer, size);
465 /* Skip over any Class Specific or Vendor Specific descriptors;
466 * find the next endpoint or interface descriptor */
467 endpoint->extra = buffer;
468 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
469 USB_DT_INTERFACE, &n);
470 endpoint->extralen = i;
471 retval = buffer - buffer0 + i;
473 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
474 n, plural(n), "endpoint");
477 skip_to_next_endpoint_or_interface_descriptor:
478 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
479 USB_DT_INTERFACE, NULL);
480 return buffer - buffer0 + i;
483 void usb_release_interface_cache(struct kref *ref)
485 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
488 for (j = 0; j < intfc->num_altsetting; j++) {
489 struct usb_host_interface *alt = &intfc->altsetting[j];
491 kfree(alt->endpoint);
497 static int usb_parse_interface(struct device *ddev, int cfgno,
498 struct usb_host_config *config, unsigned char *buffer, int size,
499 u8 inums[], u8 nalts[])
501 unsigned char *buffer0 = buffer;
502 struct usb_interface_descriptor *d;
504 struct usb_interface_cache *intfc;
505 struct usb_host_interface *alt;
508 int num_ep, num_ep_orig;
510 d = (struct usb_interface_descriptor *) buffer;
511 buffer += d->bLength;
514 if (d->bLength < USB_DT_INTERFACE_SIZE)
515 goto skip_to_next_interface_descriptor;
517 /* Which interface entry is this? */
519 inum = d->bInterfaceNumber;
520 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
521 if (inums[i] == inum) {
522 intfc = config->intf_cache[i];
526 if (!intfc || intfc->num_altsetting >= nalts[i])
527 goto skip_to_next_interface_descriptor;
529 /* Check for duplicate altsetting entries */
530 asnum = d->bAlternateSetting;
531 for ((i = 0, alt = &intfc->altsetting[0]);
532 i < intfc->num_altsetting;
534 if (alt->desc.bAlternateSetting == asnum) {
535 dev_warn(ddev, "Duplicate descriptor for config %d "
536 "interface %d altsetting %d, skipping\n",
538 goto skip_to_next_interface_descriptor;
542 ++intfc->num_altsetting;
543 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
545 /* Skip over any Class Specific or Vendor Specific descriptors;
546 * find the first endpoint or interface descriptor */
548 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
549 USB_DT_INTERFACE, &n);
552 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
553 n, plural(n), "interface");
557 /* Allocate space for the right(?) number of endpoints */
558 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
559 alt->desc.bNumEndpoints = 0; /* Use as a counter */
560 if (num_ep > USB_MAXENDPOINTS) {
561 dev_warn(ddev, "too many endpoints for config %d interface %d "
562 "altsetting %d: %d, using maximum allowed: %d\n",
563 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
564 num_ep = USB_MAXENDPOINTS;
568 /* Can't allocate 0 bytes */
569 len = sizeof(struct usb_host_endpoint) * num_ep;
570 alt->endpoint = kzalloc(len, GFP_KERNEL);
575 /* Parse all the endpoint descriptors */
578 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
581 retval = usb_parse_endpoint(ddev, cfgno, config, inum, asnum,
582 alt, num_ep, buffer, size);
591 if (n != num_ep_orig)
592 dev_warn(ddev, "config %d interface %d altsetting %d has %d "
593 "endpoint descriptor%s, different from the interface "
594 "descriptor's value: %d\n",
595 cfgno, inum, asnum, n, plural(n), num_ep_orig);
596 return buffer - buffer0;
598 skip_to_next_interface_descriptor:
599 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
600 USB_DT_INTERFACE, NULL);
601 return buffer - buffer0 + i;
604 static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
605 struct usb_host_config *config, unsigned char *buffer, int size)
607 struct device *ddev = &dev->dev;
608 unsigned char *buffer0 = buffer;
610 int nintf, nintf_orig;
612 struct usb_interface_cache *intfc;
613 unsigned char *buffer2;
615 struct usb_descriptor_header *header;
617 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
618 unsigned iad_num = 0;
620 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
621 nintf = nintf_orig = config->desc.bNumInterfaces;
622 config->desc.bNumInterfaces = 0; // Adjusted later
624 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
625 config->desc.bLength < USB_DT_CONFIG_SIZE ||
626 config->desc.bLength > size) {
627 dev_err(ddev, "invalid descriptor for config index %d: "
628 "type = 0x%X, length = %d\n", cfgidx,
629 config->desc.bDescriptorType, config->desc.bLength);
632 cfgno = config->desc.bConfigurationValue;
634 buffer += config->desc.bLength;
635 size -= config->desc.bLength;
637 if (nintf > USB_MAXINTERFACES) {
638 dev_warn(ddev, "config %d has too many interfaces: %d, "
639 "using maximum allowed: %d\n",
640 cfgno, nintf, USB_MAXINTERFACES);
641 nintf = USB_MAXINTERFACES;
644 /* Go through the descriptors, checking their length and counting the
645 * number of altsettings for each interface */
647 for ((buffer2 = buffer, size2 = size);
649 (buffer2 += header->bLength, size2 -= header->bLength)) {
651 if (size2 < sizeof(struct usb_descriptor_header)) {
652 dev_warn(ddev, "config %d descriptor has %d excess "
653 "byte%s, ignoring\n",
654 cfgno, size2, plural(size2));
658 header = (struct usb_descriptor_header *) buffer2;
659 if ((header->bLength > size2) || (header->bLength < 2)) {
660 dev_warn(ddev, "config %d has an invalid descriptor "
661 "of length %d, skipping remainder of the config\n",
662 cfgno, header->bLength);
666 if (header->bDescriptorType == USB_DT_INTERFACE) {
667 struct usb_interface_descriptor *d;
670 d = (struct usb_interface_descriptor *) header;
671 if (d->bLength < USB_DT_INTERFACE_SIZE) {
672 dev_warn(ddev, "config %d has an invalid "
673 "interface descriptor of length %d, "
674 "skipping\n", cfgno, d->bLength);
678 inum = d->bInterfaceNumber;
680 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
682 dev_warn(ddev, "config %d has more interface "
683 "descriptors, than it declares in "
684 "bNumInterfaces, ignoring interface "
685 "number: %d\n", cfgno, inum);
689 if (inum >= nintf_orig)
690 dev_warn(ddev, "config %d has an invalid "
691 "interface number: %d but max is %d\n",
692 cfgno, inum, nintf_orig - 1);
694 /* Have we already encountered this interface?
695 * Count its altsettings */
696 for (i = 0; i < n; ++i) {
697 if (inums[i] == inum)
703 } else if (n < USB_MAXINTERFACES) {
709 } else if (header->bDescriptorType ==
710 USB_DT_INTERFACE_ASSOCIATION) {
711 struct usb_interface_assoc_descriptor *d;
713 d = (struct usb_interface_assoc_descriptor *)header;
714 if (d->bLength < USB_DT_INTERFACE_ASSOCIATION_SIZE) {
716 "config %d has an invalid interface association descriptor of length %d, skipping\n",
721 if (iad_num == USB_MAXIADS) {
722 dev_warn(ddev, "found more Interface "
723 "Association Descriptors "
724 "than allocated for in "
725 "configuration %d\n", cfgno);
727 config->intf_assoc[iad_num] = d;
731 } else if (header->bDescriptorType == USB_DT_DEVICE ||
732 header->bDescriptorType == USB_DT_CONFIG)
733 dev_warn(ddev, "config %d contains an unexpected "
734 "descriptor of type 0x%X, skipping\n",
735 cfgno, header->bDescriptorType);
737 } /* for ((buffer2 = buffer, size2 = size); ...) */
738 size = buffer2 - buffer;
739 config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
742 dev_warn(ddev, "config %d has %d interface%s, different from "
743 "the descriptor's value: %d\n",
744 cfgno, n, plural(n), nintf_orig);
746 dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
747 config->desc.bNumInterfaces = nintf = n;
749 /* Check for missing interface numbers */
750 for (i = 0; i < nintf; ++i) {
751 for (j = 0; j < nintf; ++j) {
756 dev_warn(ddev, "config %d has no interface number "
760 /* Allocate the usb_interface_caches and altsetting arrays */
761 for (i = 0; i < nintf; ++i) {
763 if (j > USB_MAXALTSETTING) {
764 dev_warn(ddev, "too many alternate settings for "
765 "config %d interface %d: %d, "
766 "using maximum allowed: %d\n",
767 cfgno, inums[i], j, USB_MAXALTSETTING);
768 nalts[i] = j = USB_MAXALTSETTING;
771 len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
772 config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
775 kref_init(&intfc->ref);
778 /* FIXME: parse the BOS descriptor */
780 /* Skip over any Class Specific or Vendor Specific descriptors;
781 * find the first interface descriptor */
782 config->extra = buffer;
783 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
784 USB_DT_INTERFACE, &n);
785 config->extralen = i;
787 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
788 n, plural(n), "configuration");
792 /* Parse all the interface/altsetting descriptors */
794 retval = usb_parse_interface(ddev, cfgno, config,
795 buffer, size, inums, nalts);
803 /* Check for missing altsettings */
804 for (i = 0; i < nintf; ++i) {
805 intfc = config->intf_cache[i];
806 for (j = 0; j < intfc->num_altsetting; ++j) {
807 for (n = 0; n < intfc->num_altsetting; ++n) {
808 if (intfc->altsetting[n].desc.
809 bAlternateSetting == j)
812 if (n >= intfc->num_altsetting)
813 dev_warn(ddev, "config %d interface %d has no "
814 "altsetting %d\n", cfgno, inums[i], j);
821 /* hub-only!! ... and only exported for reset/reinit path.
822 * otherwise used internally on disconnect/destroy path
824 void usb_destroy_configuration(struct usb_device *dev)
831 if (dev->rawdescriptors) {
832 for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
833 kfree(dev->rawdescriptors[i]);
835 kfree(dev->rawdescriptors);
836 dev->rawdescriptors = NULL;
839 for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
840 struct usb_host_config *cf = &dev->config[c];
843 for (i = 0; i < cf->desc.bNumInterfaces; i++) {
844 if (cf->intf_cache[i])
845 kref_put(&cf->intf_cache[i]->ref,
846 usb_release_interface_cache);
855 * Get the USB config descriptors, cache and parse'em
857 * hub-only!! ... and only in reset path, or usb_new_device()
858 * (used by real hubs and virtual root hubs)
860 int usb_get_configuration(struct usb_device *dev)
862 struct device *ddev = &dev->dev;
863 int ncfg = dev->descriptor.bNumConfigurations;
865 unsigned int cfgno, length;
866 unsigned char *bigbuffer;
867 struct usb_config_descriptor *desc;
871 if (ncfg > USB_MAXCONFIG) {
872 dev_warn(ddev, "too many configurations: %d, "
873 "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
874 dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
878 dev_err(ddev, "no configurations\n");
882 length = ncfg * sizeof(struct usb_host_config);
883 dev->config = kzalloc(length, GFP_KERNEL);
887 length = ncfg * sizeof(char *);
888 dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
889 if (!dev->rawdescriptors)
892 desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
897 for (; cfgno < ncfg; cfgno++) {
898 /* We grab just the first descriptor so we know how long
899 * the whole configuration is */
900 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
901 desc, USB_DT_CONFIG_SIZE);
903 dev_err(ddev, "unable to read config index %d "
904 "descriptor/%s: %d\n", cfgno, "start", result);
905 if (result != -EPIPE)
907 dev_err(ddev, "chopping to %d config(s)\n", cfgno);
908 dev->descriptor.bNumConfigurations = cfgno;
910 } else if (result < 4) {
911 dev_err(ddev, "config index %d descriptor too short "
912 "(expected %i, got %i)\n", cfgno,
913 USB_DT_CONFIG_SIZE, result);
917 length = max((int) le16_to_cpu(desc->wTotalLength),
920 /* Now that we know the length, get the whole thing */
921 bigbuffer = kmalloc(length, GFP_KERNEL);
927 if (dev->quirks & USB_QUIRK_DELAY_INIT)
930 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
933 dev_err(ddev, "unable to read config index %d "
934 "descriptor/%s\n", cfgno, "all");
938 if (result < length) {
939 dev_warn(ddev, "config index %d descriptor too short "
940 "(expected %i, got %i)\n", cfgno, length, result);
944 dev->rawdescriptors[cfgno] = bigbuffer;
946 result = usb_parse_configuration(dev, cfgno,
947 &dev->config[cfgno], bigbuffer, length);
957 dev->descriptor.bNumConfigurations = cfgno;
959 if (result == -ENOMEM)
960 dev_err(ddev, "out of memory\n");
964 void usb_release_bos_descriptor(struct usb_device *dev)
967 kfree(dev->bos->desc);
973 static const __u8 bos_desc_len[256] = {
974 [USB_CAP_TYPE_WIRELESS_USB] = USB_DT_USB_WIRELESS_CAP_SIZE,
975 [USB_CAP_TYPE_EXT] = USB_DT_USB_EXT_CAP_SIZE,
976 [USB_SS_CAP_TYPE] = USB_DT_USB_SS_CAP_SIZE,
977 [USB_SSP_CAP_TYPE] = USB_DT_USB_SSP_CAP_SIZE(1),
978 [CONTAINER_ID_TYPE] = USB_DT_USB_SS_CONTN_ID_SIZE,
979 [USB_PTM_CAP_TYPE] = USB_DT_USB_PTM_ID_SIZE,
982 /* Get BOS descriptor set */
983 int usb_get_bos_descriptor(struct usb_device *dev)
985 struct device *ddev = &dev->dev;
986 struct usb_bos_descriptor *bos;
987 struct usb_dev_cap_header *cap;
988 struct usb_ssp_cap_descriptor *ssp_cap;
989 unsigned char *buffer, *buffer0;
990 int length, total_len, num, i, ssac;
994 bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
998 /* Get BOS descriptor */
999 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, bos, USB_DT_BOS_SIZE);
1000 if (ret < USB_DT_BOS_SIZE || bos->bLength < USB_DT_BOS_SIZE) {
1001 dev_err(ddev, "unable to get BOS descriptor or descriptor too short\n");
1008 length = bos->bLength;
1009 total_len = le16_to_cpu(bos->wTotalLength);
1010 num = bos->bNumDeviceCaps;
1012 if (total_len < length)
1015 dev->bos = kzalloc(sizeof(struct usb_host_bos), GFP_KERNEL);
1019 /* Now let's get the whole BOS descriptor set */
1020 buffer = kzalloc(total_len, GFP_KERNEL);
1025 dev->bos->desc = (struct usb_bos_descriptor *)buffer;
1027 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, buffer, total_len);
1028 if (ret < total_len) {
1029 dev_err(ddev, "unable to get BOS descriptor set\n");
1036 total_len -= length;
1039 for (i = 0; i < num; i++) {
1040 cap = (struct usb_dev_cap_header *)buffer;
1042 if (total_len < sizeof(*cap) || total_len < cap->bLength) {
1043 dev->bos->desc->bNumDeviceCaps = i;
1046 cap_type = cap->bDevCapabilityType;
1047 length = cap->bLength;
1048 if (bos_desc_len[cap_type] && length < bos_desc_len[cap_type]) {
1049 dev->bos->desc->bNumDeviceCaps = i;
1053 if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
1054 dev_warn(ddev, "descriptor type invalid, skip\n");
1059 case USB_CAP_TYPE_WIRELESS_USB:
1060 /* Wireless USB cap descriptor is handled by wusb */
1062 case USB_CAP_TYPE_EXT:
1064 (struct usb_ext_cap_descriptor *)buffer;
1066 case USB_SS_CAP_TYPE:
1068 (struct usb_ss_cap_descriptor *)buffer;
1070 case USB_SSP_CAP_TYPE:
1071 ssp_cap = (struct usb_ssp_cap_descriptor *)buffer;
1072 ssac = (le32_to_cpu(ssp_cap->bmAttributes) &
1073 USB_SSP_SUBLINK_SPEED_ATTRIBS);
1074 if (length >= USB_DT_USB_SSP_CAP_SIZE(ssac))
1075 dev->bos->ssp_cap = ssp_cap;
1077 case CONTAINER_ID_TYPE:
1079 (struct usb_ss_container_id_descriptor *)buffer;
1081 case USB_PTM_CAP_TYPE:
1083 (struct usb_ptm_cap_descriptor *)buffer;
1088 total_len -= length;
1091 dev->bos->desc->wTotalLength = cpu_to_le16(buffer - buffer0);
1096 usb_release_bos_descriptor(dev);