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USB: fix typo in wMaxPacketSize validation
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / core / config.c
CommitLineData
1da177e4 1#include <linux/usb.h>
615ae11b 2#include <linux/usb/ch9.h>
27729aad 3#include <linux/usb/hcd.h>
317149c6 4#include <linux/usb/quirks.h>
1da177e4
LT		 5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/slab.h>
8#include <linux/device.h>
9#include <asm/byteorder.h>
6d5e8254 10#include "usb.h"
27729aad 11
1da177e4
LT		 12
13#define USB_MAXALTSETTING 128 /* Hard limit */
14#define USB_MAXENDPOINTS 30 /* Hard limit */
15
16#define USB_MAXCONFIG 8 /* Arbitrary limit */
17
18
19static inline const char *plural(int n)
20{
21 return (n == 1 ? "" : "s");
22}
23
24static int find_next_descriptor(unsigned char *buffer, int size,
25 int dt1, int dt2, int *num_skipped)
26{
27 struct usb_descriptor_header *h;
28 int n = 0;
29 unsigned char *buffer0 = buffer;
30
31 /* Find the next descriptor of type dt1 or dt2 */
32 while (size > 0) {
33 h = (struct usb_descriptor_header *) buffer;
34 if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
35 break;
36 buffer += h->bLength;
37 size -= h->bLength;
38 ++n;
39 }
40
41 /* Store the number of descriptors skipped and return the
42 * number of bytes skipped */
43 if (num_skipped)
44 *num_skipped = n;
45 return buffer - buffer0;
46}
47
842f1690 48static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
663c30d0 49 int inum, int asnum, struct usb_host_endpoint *ep,
842f1690 50 unsigned char *buffer, int size)
663c30d0 51{
842f1690 52 struct usb_ss_ep_comp_descriptor *desc;
663c30d0 53 int max_tx;
663c30d0 54
842f1690
AS		 55 /* The SuperSpeed endpoint companion descriptor is supposed to
56 * be the first thing immediately following the endpoint descriptor.
57 */
f0058c62 58 desc = (struct usb_ss_ep_comp_descriptor *) buffer;
842f1690
AS		 59 if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP ||
60 size < USB_DT_SS_EP_COMP_SIZE) {
663c30d0
SS		 61 dev_warn(ddev, "No SuperSpeed endpoint companion for config %d "
62 " interface %d altsetting %d ep %d: "
63 "using minimum values\n",
64 cfgno, inum, asnum, ep->desc.bEndpointAddress);
842f1690
AS		 65
66 /* Fill in some default values.
67 * Leave bmAttributes as zero, which will mean no streams for
68 * bulk, and isoc won't support multiple bursts of packets.
69 * With bursts of only one packet, and a Mult of 1, the max
70 * amount of data moved per endpoint service interval is one
71 * packet.
663c30d0 72 */
842f1690
AS		 73 ep->ss_ep_comp.bLength = USB_DT_SS_EP_COMP_SIZE;
74 ep->ss_ep_comp.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
75 if (usb_endpoint_xfer_isoc(&ep->desc) ||
76 usb_endpoint_xfer_int(&ep->desc))
77 ep->ss_ep_comp.wBytesPerInterval =
78 ep->desc.wMaxPacketSize;
79 return;
663c30d0 80 }
663c30d0 81
842f1690 82 memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE);
663c30d0
SS		 83
84 /* Check the various values */
85 if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) {
86 dev_warn(ddev, "Control endpoint with bMaxBurst = %d in "
87 "config %d interface %d altsetting %d ep %d: "
88 "setting to zero\n", desc->bMaxBurst,
89 cfgno, inum, asnum, ep->desc.bEndpointAddress);
842f1690
AS		 90 ep->ss_ep_comp.bMaxBurst = 0;
91 } else if (desc->bMaxBurst > 15) {
663c30d0
SS		 92 dev_warn(ddev, "Endpoint with bMaxBurst = %d in "
93 "config %d interface %d altsetting %d ep %d: "
94 "setting to 15\n", desc->bMaxBurst,
95 cfgno, inum, asnum, ep->desc.bEndpointAddress);
842f1690 96 ep->ss_ep_comp.bMaxBurst = 15;
663c30d0 97 }
842f1690
AS		 98
99 if ((usb_endpoint_xfer_control(&ep->desc) ||
100 usb_endpoint_xfer_int(&ep->desc)) &&
101 desc->bmAttributes != 0) {
663c30d0
SS		 102 dev_warn(ddev, "%s endpoint with bmAttributes = %d in "
103 "config %d interface %d altsetting %d ep %d: "
104 "setting to zero\n",
105 usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
106 desc->bmAttributes,
107 cfgno, inum, asnum, ep->desc.bEndpointAddress);
842f1690
AS		 108 ep->ss_ep_comp.bmAttributes = 0;
109 } else if (usb_endpoint_xfer_bulk(&ep->desc) &&
110 desc->bmAttributes > 16) {
663c30d0
SS		 111 dev_warn(ddev, "Bulk endpoint with more than 65536 streams in "
112 "config %d interface %d altsetting %d ep %d: "
113 "setting to max\n",
114 cfgno, inum, asnum, ep->desc.bEndpointAddress);
842f1690
AS		 115 ep->ss_ep_comp.bmAttributes = 16;
116 } else if (usb_endpoint_xfer_isoc(&ep->desc) &&
560fac95 117 USB_SS_MULT(desc->bmAttributes) > 3) {
663c30d0
SS		 118 dev_warn(ddev, "Isoc endpoint has Mult of %d in "
119 "config %d interface %d altsetting %d ep %d: "
7541d74e
BH		 120 "setting to 3\n",
121 USB_SS_MULT(desc->bmAttributes),
663c30d0 122 cfgno, inum, asnum, ep->desc.bEndpointAddress);
842f1690 123 ep->ss_ep_comp.bmAttributes = 2;
663c30d0 124 }
842f1690
AS		 125
126 if (usb_endpoint_xfer_isoc(&ep->desc))
560fac95
MN		 127 max_tx = (desc->bMaxBurst + 1) *
128 (USB_SS_MULT(desc->bmAttributes)) *
29cc8897 129 usb_endpoint_maxp(&ep->desc);
842f1690 130 else if (usb_endpoint_xfer_int(&ep->desc))
29cc8897 131 max_tx = usb_endpoint_maxp(&ep->desc) *
7de7c7d2 132 (desc->bMaxBurst + 1);
842f1690
AS		 133 else
134 max_tx = 999999;
64b3c304 135 if (le16_to_cpu(desc->wBytesPerInterval) > max_tx) {
663c30d0
SS		 136 dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
137 "config %d interface %d altsetting %d ep %d: "
138 "setting to %d\n",
139 usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
7de7c7d2 140 le16_to_cpu(desc->wBytesPerInterval),
663c30d0
SS		 141 cfgno, inum, asnum, ep->desc.bEndpointAddress,
142 max_tx);
7de7c7d2 143 ep->ss_ep_comp.wBytesPerInterval = cpu_to_le16(max_tx);
663c30d0 144 }
663c30d0
SS		 145}
146
2226a520
AS		 147static const unsigned short low_speed_maxpacket_maxes[4] = {
148 [USB_ENDPOINT_XFER_CONTROL] = 8,
149 [USB_ENDPOINT_XFER_ISOC] = 0,
150 [USB_ENDPOINT_XFER_BULK] = 0,
151 [USB_ENDPOINT_XFER_INT] = 8,
152};
153static const unsigned short full_speed_maxpacket_maxes[4] = {
154 [USB_ENDPOINT_XFER_CONTROL] = 64,
155 [USB_ENDPOINT_XFER_ISOC] = 1023,
156 [USB_ENDPOINT_XFER_BULK] = 64,
157 [USB_ENDPOINT_XFER_INT] = 64,
158};
159static const unsigned short high_speed_maxpacket_maxes[4] = {
160 [USB_ENDPOINT_XFER_CONTROL] = 64,
161 [USB_ENDPOINT_XFER_ISOC] = 1024,
162 [USB_ENDPOINT_XFER_BULK] = 512,
bb9a7c51 163 [USB_ENDPOINT_XFER_INT] = 1024,
2226a520
AS		 164};
165static const unsigned short super_speed_maxpacket_maxes[4] = {
166 [USB_ENDPOINT_XFER_CONTROL] = 512,
167 [USB_ENDPOINT_XFER_ISOC] = 1024,
168 [USB_ENDPOINT_XFER_BULK] = 1024,
169 [USB_ENDPOINT_XFER_INT] = 1024,
170};
171
1da177e4
LT		 172static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
173 int asnum, struct usb_host_interface *ifp, int num_ep,
174 unsigned char *buffer, int size)
175{
176 unsigned char *buffer0 = buffer;
177 struct usb_endpoint_descriptor *d;
178 struct usb_host_endpoint *endpoint;
663c30d0 179 int n, i, j, retval;
2226a520
AS		 180 unsigned int maxp;
181 const unsigned short *maxpacket_maxes;
1da177e4
LT		 182
183 d = (struct usb_endpoint_descriptor *) buffer;
184 buffer += d->bLength;
185 size -= d->bLength;
186
187 if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
188 n = USB_DT_ENDPOINT_AUDIO_SIZE;
189 else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
190 n = USB_DT_ENDPOINT_SIZE;
191 else {
192 dev_warn(ddev, "config %d interface %d altsetting %d has an "
193 "invalid endpoint descriptor of length %d, skipping\n",
194 cfgno, inum, asnum, d->bLength);
195 goto skip_to_next_endpoint_or_interface_descriptor;
196 }
197
198 i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK;
199 if (i >= 16 || i == 0) {
200 dev_warn(ddev, "config %d interface %d altsetting %d has an "
201 "invalid endpoint with address 0x%X, skipping\n",
202 cfgno, inum, asnum, d->bEndpointAddress);
203 goto skip_to_next_endpoint_or_interface_descriptor;
204 }
205
206 /* Only store as many endpoints as we have room for */
207 if (ifp->desc.bNumEndpoints >= num_ep)
208 goto skip_to_next_endpoint_or_interface_descriptor;
209
210 endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
211 ++ifp->desc.bNumEndpoints;
212
213 memcpy(&endpoint->desc, d, n);
214 INIT_LIST_HEAD(&endpoint->urb_list);
215
300871cd
LP		 216 /* Fix up bInterval values outside the legal range. Use 32 ms if no
217 * proper value can be guessed. */
615ae11b
AS		 218 i = 0; /* i = min, j = max, n = default */
219 j = 255;
220 if (usb_endpoint_xfer_int(d)) {
221 i = 1;
222 switch (to_usb_device(ddev)->speed) {
6b403b02 223 case USB_SPEED_SUPER:
615ae11b 224 case USB_SPEED_HIGH:
300871cd
LP		 225 /* Many device manufacturers are using full-speed
226 * bInterval values in high-speed interrupt endpoint
227 * descriptors. Try to fix those and fall back to a
228 * 32 ms default value otherwise. */
229 n = fls(d->bInterval*8);
230 if (n == 0)
231 n = 9; /* 32 ms = 2^(9-1) uframes */
615ae11b
AS		 232 j = 16;
233 break;
234 default: /* USB_SPEED_FULL or _LOW */
235 /* For low-speed, 10 ms is the official minimum.
236 * But some "overclocked" devices might want faster
237 * polling so we'll allow it. */
238 n = 32;
239 break;
240 }
241 } else if (usb_endpoint_xfer_isoc(d)) {
242 i = 1;
243 j = 16;
244 switch (to_usb_device(ddev)->speed) {
245 case USB_SPEED_HIGH:
246 n = 9; /* 32 ms = 2^(9-1) uframes */
247 break;
248 default: /* USB_SPEED_FULL */
249 n = 6; /* 32 ms = 2^(6-1) frames */
250 break;
251 }
252 }
253 if (d->bInterval < i || d->bInterval > j) {
254 dev_warn(ddev, "config %d interface %d altsetting %d "
255 "endpoint 0x%X has an invalid bInterval %d, "
256 "changing to %d\n",
257 cfgno, inum, asnum,
258 d->bEndpointAddress, d->bInterval, n);
259 endpoint->desc.bInterval = n;
260 }
261
60aac1ec
AS		 262 /* Some buggy low-speed devices have Bulk endpoints, which is
263 * explicitly forbidden by the USB spec. In an attempt to make
264 * them usable, we will try treating them as Interrupt endpoints.
265 */
266 if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
267 usb_endpoint_xfer_bulk(d)) {
268 dev_warn(ddev, "config %d interface %d altsetting %d "
269 "endpoint 0x%X is Bulk; changing to Interrupt\n",
270 cfgno, inum, asnum, d->bEndpointAddress);
271 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
272 endpoint->desc.bInterval = 1;
29cc8897 273 if (usb_endpoint_maxp(&endpoint->desc) > 8)
60aac1ec
AS		 274 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
275 }
276
2226a520
AS		 277 /* Validate the wMaxPacketSize field */
278 maxp = usb_endpoint_maxp(&endpoint->desc);
279
280 /* Find the highest legal maxpacket size for this endpoint */
281 i = 0; /* additional transactions per microframe */
282 switch (to_usb_device(ddev)->speed) {
283 case USB_SPEED_LOW:
284 maxpacket_maxes = low_speed_maxpacket_maxes;
285 break;
286 case USB_SPEED_FULL:
287 maxpacket_maxes = full_speed_maxpacket_maxes;
288 break;
289 case USB_SPEED_HIGH:
290 /* Bits 12..11 are allowed only for HS periodic endpoints */
291 if (usb_endpoint_xfer_int(d) || usb_endpoint_xfer_isoc(d)) {
292 i = maxp & (BIT(12) | BIT(11));
293 maxp &= ~i;
294 }
295 /* fallthrough */
296 default:
297 maxpacket_maxes = high_speed_maxpacket_maxes;
298 break;
299 case USB_SPEED_SUPER:
300 maxpacket_maxes = super_speed_maxpacket_maxes;
301 break;
302 }
303 j = maxpacket_maxes[usb_endpoint_type(&endpoint->desc)];
304
305 if (maxp > j) {
306 dev_warn(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid maxpacket %d, setting to %d\n",
307 cfgno, inum, asnum, d->bEndpointAddress, maxp, j);
308 maxp = j;
309 endpoint->desc.wMaxPacketSize = cpu_to_le16(i | maxp);
310 }
311
caa9ef67
DB		 312 /*
313 * Some buggy high speed devices have bulk endpoints using
314 * maxpacket sizes other than 512. High speed HCDs may not
315 * be able to handle that particular bug, so let's warn...
316 */
317 if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
318 && usb_endpoint_xfer_bulk(d)) {
caa9ef67
DB		 319 if (maxp != 512)
320 dev_warn(ddev, "config %d interface %d altsetting %d "
321 "bulk endpoint 0x%X has invalid maxpacket %d\n",
322 cfgno, inum, asnum, d->bEndpointAddress,
323 maxp);
324 }
663c30d0 325
842f1690
AS		 326 /* Parse a possible SuperSpeed endpoint companion descriptor */
327 if (to_usb_device(ddev)->speed == USB_SPEED_SUPER)
328 usb_parse_ss_endpoint_companion(ddev, cfgno,
329 inum, asnum, endpoint, buffer, size);
9f8e4438 330
842f1690
AS		 331 /* Skip over any Class Specific or Vendor Specific descriptors;
332 * find the next endpoint or interface descriptor */
333 endpoint->extra = buffer;
334 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
335 USB_DT_INTERFACE, &n);
336 endpoint->extralen = i;
337 retval = buffer - buffer0 + i;
1da177e4
LT		 338 if (n > 0)
339 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
340 n, plural(n), "endpoint");
663c30d0 341 return retval;
1da177e4
LT		 342
343skip_to_next_endpoint_or_interface_descriptor:
344 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
345 USB_DT_INTERFACE, NULL);
346 return buffer - buffer0 + i;
347}
348
349void usb_release_interface_cache(struct kref *ref)
350{
351 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
352 int j;
353
4f62efe6
AS		 354 for (j = 0; j < intfc->num_altsetting; j++) {
355 struct usb_host_interface *alt = &intfc->altsetting[j];
356
357 kfree(alt->endpoint);
358 kfree(alt->string);
359 }
1da177e4
LT		 360 kfree(intfc);
361}
362
363static int usb_parse_interface(struct device *ddev, int cfgno,
364 struct usb_host_config *config, unsigned char *buffer, int size,
365 u8 inums[], u8 nalts[])
366{
367 unsigned char *buffer0 = buffer;
368 struct usb_interface_descriptor *d;
369 int inum, asnum;
370 struct usb_interface_cache *intfc;
371 struct usb_host_interface *alt;
372 int i, n;
373 int len, retval;
374 int num_ep, num_ep_orig;
375
376 d = (struct usb_interface_descriptor *) buffer;
377 buffer += d->bLength;
378 size -= d->bLength;
379
380 if (d->bLength < USB_DT_INTERFACE_SIZE)
381 goto skip_to_next_interface_descriptor;
382
383 /* Which interface entry is this? */
384 intfc = NULL;
385 inum = d->bInterfaceNumber;
386 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
387 if (inums[i] == inum) {
388 intfc = config->intf_cache[i];
389 break;
390 }
391 }
392 if (!intfc || intfc->num_altsetting >= nalts[i])
393 goto skip_to_next_interface_descriptor;
394
395 /* Check for duplicate altsetting entries */
396 asnum = d->bAlternateSetting;
397 for ((i = 0, alt = &intfc->altsetting[0]);
398 i < intfc->num_altsetting;
399 (++i, ++alt)) {
400 if (alt->desc.bAlternateSetting == asnum) {
401 dev_warn(ddev, "Duplicate descriptor for config %d "
402 "interface %d altsetting %d, skipping\n",
403 cfgno, inum, asnum);
404 goto skip_to_next_interface_descriptor;
405 }
406 }
407
408 ++intfc->num_altsetting;
409 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
410
411 /* Skip over any Class Specific or Vendor Specific descriptors;
412 * find the first endpoint or interface descriptor */
413 alt->extra = buffer;
414 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
415 USB_DT_INTERFACE, &n);
416 alt->extralen = i;
417 if (n > 0)
418 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
419 n, plural(n), "interface");
420 buffer += i;
421 size -= i;
422
423 /* Allocate space for the right(?) number of endpoints */
424 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
2c044a48 425 alt->desc.bNumEndpoints = 0; /* Use as a counter */
1da177e4
LT		 426 if (num_ep > USB_MAXENDPOINTS) {
427 dev_warn(ddev, "too many endpoints for config %d interface %d "
428 "altsetting %d: %d, using maximum allowed: %d\n",
429 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
430 num_ep = USB_MAXENDPOINTS;
431 }
432
2c044a48
GKH		 433 if (num_ep > 0) {
434 /* Can't allocate 0 bytes */
57a21c1b
AS		 435 len = sizeof(struct usb_host_endpoint) * num_ep;
436 alt->endpoint = kzalloc(len, GFP_KERNEL);
437 if (!alt->endpoint)
438 return -ENOMEM;
439 }
1da177e4
LT		 440
441 /* Parse all the endpoint descriptors */
442 n = 0;
443 while (size > 0) {
444 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
445 == USB_DT_INTERFACE)
446 break;
447 retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
448 num_ep, buffer, size);
449 if (retval < 0)
450 return retval;
451 ++n;
452
453 buffer += retval;
454 size -= retval;
455 }
456
457 if (n != num_ep_orig)
458 dev_warn(ddev, "config %d interface %d altsetting %d has %d "
459 "endpoint descriptor%s, different from the interface "
460 "descriptor's value: %d\n",
461 cfgno, inum, asnum, n, plural(n), num_ep_orig);
462 return buffer - buffer0;
463
464skip_to_next_interface_descriptor:
465 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
466 USB_DT_INTERFACE, NULL);
467 return buffer - buffer0 + i;
468}
469
317149c6 470static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
1da177e4
LT		 471 struct usb_host_config *config, unsigned char *buffer, int size)
472{
317149c6 473 struct device *ddev = &dev->dev;
1da177e4
LT		 474 unsigned char *buffer0 = buffer;
475 int cfgno;
476 int nintf, nintf_orig;
477 int i, j, n;
478 struct usb_interface_cache *intfc;
479 unsigned char *buffer2;
480 int size2;
481 struct usb_descriptor_header *header;
482 int len, retval;
483 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
165fe97e 484 unsigned iad_num = 0;
1da177e4
LT		 485
486 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
487 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
ef7198be
HG		 488 config->desc.bLength < USB_DT_CONFIG_SIZE ||
489 config->desc.bLength > size) {
1da177e4
LT		 490 dev_err(ddev, "invalid descriptor for config index %d: "
491 "type = 0x%X, length = %d\n", cfgidx,
492 config->desc.bDescriptorType, config->desc.bLength);
493 return -EINVAL;
494 }
495 cfgno = config->desc.bConfigurationValue;
496
497 buffer += config->desc.bLength;
498 size -= config->desc.bLength;
499
500 nintf = nintf_orig = config->desc.bNumInterfaces;
501 if (nintf > USB_MAXINTERFACES) {
502 dev_warn(ddev, "config %d has too many interfaces: %d, "
503 "using maximum allowed: %d\n",
504 cfgno, nintf, USB_MAXINTERFACES);
505 nintf = USB_MAXINTERFACES;
506 }
507
508 /* Go through the descriptors, checking their length and counting the
509 * number of altsettings for each interface */
510 n = 0;
511 for ((buffer2 = buffer, size2 = size);
512 size2 > 0;
513 (buffer2 += header->bLength, size2 -= header->bLength)) {
514
515 if (size2 < sizeof(struct usb_descriptor_header)) {
516 dev_warn(ddev, "config %d descriptor has %d excess "
517 "byte%s, ignoring\n",
518 cfgno, size2, plural(size2));
519 break;
520 }
521
522 header = (struct usb_descriptor_header *) buffer2;
523 if ((header->bLength > size2) || (header->bLength < 2)) {
524 dev_warn(ddev, "config %d has an invalid descriptor "
525 "of length %d, skipping remainder of the config\n",
526 cfgno, header->bLength);
527 break;
528 }
529
530 if (header->bDescriptorType == USB_DT_INTERFACE) {
531 struct usb_interface_descriptor *d;
532 int inum;
533
534 d = (struct usb_interface_descriptor *) header;
535 if (d->bLength < USB_DT_INTERFACE_SIZE) {
536 dev_warn(ddev, "config %d has an invalid "
537 "interface descriptor of length %d, "
538 "skipping\n", cfgno, d->bLength);
539 continue;
540 }
541
542 inum = d->bInterfaceNumber;
317149c6
HG		 543
544 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
545 n >= nintf_orig) {
546 dev_warn(ddev, "config %d has more interface "
547 "descriptors, than it declares in "
548 "bNumInterfaces, ignoring interface "
549 "number: %d\n", cfgno, inum);
550 continue;
551 }
552
1da177e4
LT		 553 if (inum >= nintf_orig)
554 dev_warn(ddev, "config %d has an invalid "
555 "interface number: %d but max is %d\n",
556 cfgno, inum, nintf_orig - 1);
557
558 /* Have we already encountered this interface?
559 * Count its altsettings */
560 for (i = 0; i < n; ++i) {
561 if (inums[i] == inum)
562 break;
563 }
564 if (i < n) {
565 if (nalts[i] < 255)
566 ++nalts[i];
567 } else if (n < USB_MAXINTERFACES) {
568 inums[n] = inum;
569 nalts[n] = 1;
570 ++n;
571 }
572
165fe97e
CN		 573 } else if (header->bDescriptorType ==
574 USB_DT_INTERFACE_ASSOCIATION) {
575 if (iad_num == USB_MAXIADS) {
576 dev_warn(ddev, "found more Interface "
577 "Association Descriptors "
578 "than allocated for in "
579 "configuration %d\n", cfgno);
580 } else {
581 config->intf_assoc[iad_num] =
582 (struct usb_interface_assoc_descriptor
583 *)header;
584 iad_num++;
585 }
586
1da177e4
LT		 587 } else if (header->bDescriptorType == USB_DT_DEVICE ||
588 header->bDescriptorType == USB_DT_CONFIG)
589 dev_warn(ddev, "config %d contains an unexpected "
590 "descriptor of type 0x%X, skipping\n",
591 cfgno, header->bDescriptorType);
592
593 } /* for ((buffer2 = buffer, size2 = size); ...) */
594 size = buffer2 - buffer;
595 config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
596
597 if (n != nintf)
598 dev_warn(ddev, "config %d has %d interface%s, different from "
599 "the descriptor's value: %d\n",
600 cfgno, n, plural(n), nintf_orig);
601 else if (n == 0)
602 dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
603 config->desc.bNumInterfaces = nintf = n;
604
605 /* Check for missing interface numbers */
606 for (i = 0; i < nintf; ++i) {
607 for (j = 0; j < nintf; ++j) {
608 if (inums[j] == i)
609 break;
610 }
611 if (j >= nintf)
612 dev_warn(ddev, "config %d has no interface number "
613 "%d\n", cfgno, i);
614 }
615
616 /* Allocate the usb_interface_caches and altsetting arrays */
617 for (i = 0; i < nintf; ++i) {
618 j = nalts[i];
619 if (j > USB_MAXALTSETTING) {
620 dev_warn(ddev, "too many alternate settings for "
621 "config %d interface %d: %d, "
622 "using maximum allowed: %d\n",
623 cfgno, inums[i], j, USB_MAXALTSETTING);
624 nalts[i] = j = USB_MAXALTSETTING;
625 }
626
627 len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
0a1ef3b5 628 config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
1da177e4
LT		 629 if (!intfc)
630 return -ENOMEM;
1da177e4
LT		 631 kref_init(&intfc->ref);
632 }
633
663c30d0
SS		 634 /* FIXME: parse the BOS descriptor */
635
1da177e4
LT		 636 /* Skip over any Class Specific or Vendor Specific descriptors;
637 * find the first interface descriptor */
638 config->extra = buffer;
639 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
640 USB_DT_INTERFACE, &n);
641 config->extralen = i;
642 if (n > 0)
643 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
644 n, plural(n), "configuration");
645 buffer += i;
646 size -= i;
647
648 /* Parse all the interface/altsetting descriptors */
649 while (size > 0) {
650 retval = usb_parse_interface(ddev, cfgno, config,
651 buffer, size, inums, nalts);
652 if (retval < 0)
653 return retval;
654
655 buffer += retval;
656 size -= retval;
657 }
658
659 /* Check for missing altsettings */
660 for (i = 0; i < nintf; ++i) {
661 intfc = config->intf_cache[i];
662 for (j = 0; j < intfc->num_altsetting; ++j) {
663 for (n = 0; n < intfc->num_altsetting; ++n) {
664 if (intfc->altsetting[n].desc.
665 bAlternateSetting == j)
666 break;
667 }
668 if (n >= intfc->num_altsetting)
669 dev_warn(ddev, "config %d interface %d has no "
670 "altsetting %d\n", cfgno, inums[i], j);
671 }
672 }
673
674 return 0;
675}
676
2c044a48
GKH		 677/* hub-only!! ... and only exported for reset/reinit path.
678 * otherwise used internally on disconnect/destroy path
679 */
1da177e4
LT		 680void usb_destroy_configuration(struct usb_device *dev)
681{
682 int c, i;
683
684 if (!dev->config)
685 return;
686
687 if (dev->rawdescriptors) {
688 for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
689 kfree(dev->rawdescriptors[i]);
690
691 kfree(dev->rawdescriptors);
692 dev->rawdescriptors = NULL;
693 }
694
695 for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
696 struct usb_host_config *cf = &dev->config[c];
697
698 kfree(cf->string);
1da177e4
LT		 699 for (i = 0; i < cf->desc.bNumInterfaces; i++) {
700 if (cf->intf_cache[i])
2c044a48 701 kref_put(&cf->intf_cache[i]->ref,
1da177e4
LT		 702 usb_release_interface_cache);
703 }
704 }
705 kfree(dev->config);
706 dev->config = NULL;
707}
708
709
1145065c
IPG		 710/*
711 * Get the USB config descriptors, cache and parse'em
712 *
713 * hub-only!! ... and only in reset path, or usb_new_device()
714 * (used by real hubs and virtual root hubs)
1145065c 715 */
1da177e4
LT		 716int usb_get_configuration(struct usb_device *dev)
717{
718 struct device *ddev = &dev->dev;
719 int ncfg = dev->descriptor.bNumConfigurations;
1145065c 720 int result = 0;
1da177e4 721 unsigned int cfgno, length;
1da177e4 722 unsigned char *bigbuffer;
2c044a48 723 struct usb_config_descriptor *desc;
1da177e4 724
1145065c 725 cfgno = 0;
1145065c 726 result = -ENOMEM;
1da177e4
LT		 727 if (ncfg > USB_MAXCONFIG) {
728 dev_warn(ddev, "too many configurations: %d, "
729 "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
730 dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
731 }
732
733 if (ncfg < 1) {
734 dev_err(ddev, "no configurations\n");
735 return -EINVAL;
736 }
737
738 length = ncfg * sizeof(struct usb_host_config);
0a1ef3b5 739 dev->config = kzalloc(length, GFP_KERNEL);
1da177e4
LT		 740 if (!dev->config)
741 goto err2;
1da177e4
LT		 742
743 length = ncfg * sizeof(char *);
0a1ef3b5 744 dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
1da177e4
LT		 745 if (!dev->rawdescriptors)
746 goto err2;
1da177e4 747
e8f4af30
MN		 748 desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
749 if (!desc)
1da177e4 750 goto err2;
1da177e4 751
1145065c
IPG		 752 result = 0;
753 for (; cfgno < ncfg; cfgno++) {
1da177e4
LT		 754 /* We grab just the first descriptor so we know how long
755 * the whole configuration is */
756 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
e8f4af30 757 desc, USB_DT_CONFIG_SIZE);
1da177e4
LT		 758 if (result < 0) {
759 dev_err(ddev, "unable to read config index %d "
1145065c 760 "descriptor/%s: %d\n", cfgno, "start", result);
3a22b872
LT		 761 if (result != -EPIPE)
762 goto err;
cb4c8fe5
IPG		 763 dev_err(ddev, "chopping to %d config(s)\n", cfgno);
764 dev->descriptor.bNumConfigurations = cfgno;
765 break;
1da177e4
LT		 766 } else if (result < 4) {
767 dev_err(ddev, "config index %d descriptor too short "
768 "(expected %i, got %i)\n", cfgno,
769 USB_DT_CONFIG_SIZE, result);
770 result = -EINVAL;
771 goto err;
772 }
773 length = max((int) le16_to_cpu(desc->wTotalLength),
774 USB_DT_CONFIG_SIZE);
775
776 /* Now that we know the length, get the whole thing */
777 bigbuffer = kmalloc(length, GFP_KERNEL);
778 if (!bigbuffer) {
779 result = -ENOMEM;
780 goto err;
781 }
3ec34db2
JW		 782
783 if (dev->quirks & USB_QUIRK_DELAY_INIT)
784 msleep(100);
785
1da177e4
LT		 786 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
787 bigbuffer, length);
788 if (result < 0) {
789 dev_err(ddev, "unable to read config index %d "
790 "descriptor/%s\n", cfgno, "all");
791 kfree(bigbuffer);
792 goto err;
793 }
794 if (result < length) {
795 dev_warn(ddev, "config index %d descriptor too short "
796 "(expected %i, got %i)\n", cfgno, length, result);
797 length = result;
798 }
799
800 dev->rawdescriptors[cfgno] = bigbuffer;
801
317149c6 802 result = usb_parse_configuration(dev, cfgno,
1da177e4
LT		 803 &dev->config[cfgno], bigbuffer, length);
804 if (result < 0) {
805 ++cfgno;
806 goto err;
807 }
808 }
809 result = 0;
810
811err:
e8f4af30 812 kfree(desc);
1da177e4
LT		 813 dev->descriptor.bNumConfigurations = cfgno;
814err2:
815 if (result == -ENOMEM)
816 dev_err(ddev, "out of memory\n");
817 return result;
818}
3148bf04
AX		 819
820void usb_release_bos_descriptor(struct usb_device *dev)
821{
822 if (dev->bos) {
823 kfree(dev->bos->desc);
824 kfree(dev->bos);
825 dev->bos = NULL;
826 }
827}
828
829/* Get BOS descriptor set */
830int usb_get_bos_descriptor(struct usb_device *dev)
831{
832 struct device *ddev = &dev->dev;
833 struct usb_bos_descriptor *bos;
834 struct usb_dev_cap_header *cap;
835 unsigned char *buffer;
836 int length, total_len, num, i;
837 int ret;
838
839 bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
840 if (!bos)
841 return -ENOMEM;
842
843 /* Get BOS descriptor */
844 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, bos, USB_DT_BOS_SIZE);
845 if (ret < USB_DT_BOS_SIZE) {
846 dev_err(ddev, "unable to get BOS descriptor\n");
847 if (ret >= 0)
848 ret = -ENOMSG;
849 kfree(bos);
850 return ret;
851 }
852
853 length = bos->bLength;
854 total_len = le16_to_cpu(bos->wTotalLength);
855 num = bos->bNumDeviceCaps;
856 kfree(bos);
857 if (total_len < length)
858 return -EINVAL;
859
860 dev->bos = kzalloc(sizeof(struct usb_host_bos), GFP_KERNEL);
861 if (!dev->bos)
862 return -ENOMEM;
863
864 /* Now let's get the whole BOS descriptor set */
865 buffer = kzalloc(total_len, GFP_KERNEL);
866 if (!buffer) {
867 ret = -ENOMEM;
868 goto err;
869 }
870 dev->bos->desc = (struct usb_bos_descriptor *)buffer;
871
872 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, buffer, total_len);
873 if (ret < total_len) {
874 dev_err(ddev, "unable to get BOS descriptor set\n");
875 if (ret >= 0)
876 ret = -ENOMSG;
877 goto err;
878 }
879 total_len -= length;
880
881 for (i = 0; i < num; i++) {
882 buffer += length;
883 cap = (struct usb_dev_cap_header *)buffer;
884 length = cap->bLength;
885
886 if (total_len < length)
887 break;
888 total_len -= length;
889
890 if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
891 dev_warn(ddev, "descriptor type invalid, skip\n");
892 continue;
893 }
894
895 switch (cap->bDevCapabilityType) {
896 case USB_CAP_TYPE_WIRELESS_USB:
897 /* Wireless USB cap descriptor is handled by wusb */
898 break;
899 case USB_CAP_TYPE_EXT:
900 dev->bos->ext_cap =
901 (struct usb_ext_cap_descriptor *)buffer;
902 break;
903 case USB_SS_CAP_TYPE:
904 dev->bos->ss_cap =
905 (struct usb_ss_cap_descriptor *)buffer;
906 break;
907 case CONTAINER_ID_TYPE:
908 dev->bos->ss_id =
909 (struct usb_ss_container_id_descriptor *)buffer;
910 break;
911 default:
912 break;
913 }
914 }
915
916 return 0;
917
918err:
919 usb_release_bos_descriptor(dev);
920 return ret;
921}
kernel source for telekom puls (alcatel/mediatek)