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[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / usb / core / config.c
1 #include <linux/usb.h>
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>
9 #include "usb.h"
10
11
12 #define USB_MAXALTSETTING 128 /* Hard limit */
13
14 #define USB_MAXCONFIG 8 /* Arbitrary limit */
15
16
17 static inline const char *plural(int n)
18 {
19 return (n == 1 ? "" : "s");
20 }
21
22 static int find_next_descriptor(unsigned char *buffer, int size,
23 int dt1, int dt2, int *num_skipped)
24 {
25 struct usb_descriptor_header *h;
26 int n = 0;
27 unsigned char *buffer0 = buffer;
28
29 /* Find the next descriptor of type dt1 or dt2 */
30 while (size > 0) {
31 h = (struct usb_descriptor_header *) buffer;
32 if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
33 break;
34 buffer += h->bLength;
35 size -= h->bLength;
36 ++n;
37 }
38
39 /* Store the number of descriptors skipped and return the
40 * number of bytes skipped */
41 if (num_skipped)
42 *num_skipped = n;
43 return buffer - buffer0;
44 }
45
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)
49 {
50 struct usb_ssp_isoc_ep_comp_descriptor *desc;
51
52 /*
53 * The SuperSpeedPlus Isoc endpoint companion descriptor immediately
54 * follows the SuperSpeed Endpoint Companion descriptor
55 */
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);
62 return;
63 }
64 memcpy(&ep->ssp_isoc_ep_comp, desc, USB_DT_SSP_ISOC_EP_COMP_SIZE);
65 }
66
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)
70 {
71 struct usb_ss_ep_comp_descriptor *desc;
72 int max_tx;
73
74 /* The SuperSpeed endpoint companion descriptor is supposed to
75 * be the first thing immediately following the endpoint descriptor.
76 */
77 desc = (struct usb_ss_ep_comp_descriptor *) buffer;
78
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);
85
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
91 * packet.
92 */
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;
99 return;
100 }
101 buffer += desc->bLength;
102 size -= desc->bLength;
103 memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE);
104
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;
118 }
119
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: "
125 "setting to zero\n",
126 usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
127 desc->bmAttributes,
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: "
134 "setting to max\n",
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: "
142 "setting to 3\n",
143 USB_SS_MULT(desc->bmAttributes),
144 cfgno, inum, asnum, ep->desc.bEndpointAddress);
145 ep->ss_ep_comp.bmAttributes = 2;
146 }
147
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);
155 else
156 max_tx = 999999;
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: "
160 "setting to %d\n",
161 usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
162 le16_to_cpu(desc->wBytesPerInterval),
163 cfgno, inum, asnum, ep->desc.bEndpointAddress,
164 max_tx);
165 ep->ss_ep_comp.wBytesPerInterval = cpu_to_le16(max_tx);
166 }
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,
171 ep, buffer, size);
172 }
173
174 static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
175 int asnum, struct usb_host_interface *ifp, int num_ep,
176 unsigned char *buffer, int size)
177 {
178 unsigned char *buffer0 = buffer;
179 struct usb_endpoint_descriptor *d;
180 struct usb_host_endpoint *endpoint;
181 int n, i, j, retval;
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
216 /* Fix up bInterval values outside the legal range. Use 32 ms if no
217 * proper value can be guessed. */
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) {
223 case USB_SPEED_SUPER_PLUS:
224 case USB_SPEED_SUPER:
225 case USB_SPEED_HIGH:
226 /* Many device manufacturers are using full-speed
227 * bInterval values in high-speed interrupt endpoint
228 * descriptors. Try to fix those and fall back to a
229 * 32 ms default value otherwise. */
230 n = fls(d->bInterval*8);
231 if (n == 0)
232 n = 9; /* 32 ms = 2^(9-1) uframes */
233 j = 16;
234
235 /*
236 * Adjust bInterval for quirked devices.
237 * This quirk fixes bIntervals reported in
238 * linear microframes.
239 */
240 if (to_usb_device(ddev)->quirks &
241 USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL) {
242 n = clamp(fls(d->bInterval), i, j);
243 i = j = n;
244 }
245 break;
246 default: /* USB_SPEED_FULL or _LOW */
247 /* For low-speed, 10 ms is the official minimum.
248 * But some "overclocked" devices might want faster
249 * polling so we'll allow it. */
250 n = 32;
251 break;
252 }
253 } else if (usb_endpoint_xfer_isoc(d)) {
254 i = 1;
255 j = 16;
256 switch (to_usb_device(ddev)->speed) {
257 case USB_SPEED_HIGH:
258 n = 9; /* 32 ms = 2^(9-1) uframes */
259 break;
260 default: /* USB_SPEED_FULL */
261 n = 6; /* 32 ms = 2^(6-1) frames */
262 break;
263 }
264 }
265 if (d->bInterval < i || d->bInterval > j) {
266 dev_warn(ddev, "config %d interface %d altsetting %d "
267 "endpoint 0x%X has an invalid bInterval %d, "
268 "changing to %d\n",
269 cfgno, inum, asnum,
270 d->bEndpointAddress, d->bInterval, n);
271 endpoint->desc.bInterval = n;
272 }
273
274 /* Some buggy low-speed devices have Bulk endpoints, which is
275 * explicitly forbidden by the USB spec. In an attempt to make
276 * them usable, we will try treating them as Interrupt endpoints.
277 */
278 if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
279 usb_endpoint_xfer_bulk(d)) {
280 dev_warn(ddev, "config %d interface %d altsetting %d "
281 "endpoint 0x%X is Bulk; changing to Interrupt\n",
282 cfgno, inum, asnum, d->bEndpointAddress);
283 endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
284 endpoint->desc.bInterval = 1;
285 if (usb_endpoint_maxp(&endpoint->desc) > 8)
286 endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
287 }
288
289 /*
290 * Some buggy high speed devices have bulk endpoints using
291 * maxpacket sizes other than 512. High speed HCDs may not
292 * be able to handle that particular bug, so let's warn...
293 */
294 if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
295 && usb_endpoint_xfer_bulk(d)) {
296 unsigned maxp;
297
298 maxp = usb_endpoint_maxp(&endpoint->desc) & 0x07ff;
299 if (maxp != 512)
300 dev_warn(ddev, "config %d interface %d altsetting %d "
301 "bulk endpoint 0x%X has invalid maxpacket %d\n",
302 cfgno, inum, asnum, d->bEndpointAddress,
303 maxp);
304 }
305
306 /* Parse a possible SuperSpeed endpoint companion descriptor */
307 if (to_usb_device(ddev)->speed >= USB_SPEED_SUPER)
308 usb_parse_ss_endpoint_companion(ddev, cfgno,
309 inum, asnum, endpoint, buffer, size);
310
311 /* Skip over any Class Specific or Vendor Specific descriptors;
312 * find the next endpoint or interface descriptor */
313 endpoint->extra = buffer;
314 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
315 USB_DT_INTERFACE, &n);
316 endpoint->extralen = i;
317 retval = buffer - buffer0 + i;
318 if (n > 0)
319 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
320 n, plural(n), "endpoint");
321 return retval;
322
323 skip_to_next_endpoint_or_interface_descriptor:
324 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
325 USB_DT_INTERFACE, NULL);
326 return buffer - buffer0 + i;
327 }
328
329 void usb_release_interface_cache(struct kref *ref)
330 {
331 struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
332 int j;
333
334 for (j = 0; j < intfc->num_altsetting; j++) {
335 struct usb_host_interface *alt = &intfc->altsetting[j];
336
337 kfree(alt->endpoint);
338 kfree(alt->string);
339 }
340 kfree(intfc);
341 }
342
343 static int usb_parse_interface(struct device *ddev, int cfgno,
344 struct usb_host_config *config, unsigned char *buffer, int size,
345 u8 inums[], u8 nalts[])
346 {
347 unsigned char *buffer0 = buffer;
348 struct usb_interface_descriptor *d;
349 int inum, asnum;
350 struct usb_interface_cache *intfc;
351 struct usb_host_interface *alt;
352 int i, n;
353 int len, retval;
354 int num_ep, num_ep_orig;
355
356 d = (struct usb_interface_descriptor *) buffer;
357 buffer += d->bLength;
358 size -= d->bLength;
359
360 if (d->bLength < USB_DT_INTERFACE_SIZE)
361 goto skip_to_next_interface_descriptor;
362
363 /* Which interface entry is this? */
364 intfc = NULL;
365 inum = d->bInterfaceNumber;
366 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
367 if (inums[i] == inum) {
368 intfc = config->intf_cache[i];
369 break;
370 }
371 }
372 if (!intfc || intfc->num_altsetting >= nalts[i])
373 goto skip_to_next_interface_descriptor;
374
375 /* Check for duplicate altsetting entries */
376 asnum = d->bAlternateSetting;
377 for ((i = 0, alt = &intfc->altsetting[0]);
378 i < intfc->num_altsetting;
379 (++i, ++alt)) {
380 if (alt->desc.bAlternateSetting == asnum) {
381 dev_warn(ddev, "Duplicate descriptor for config %d "
382 "interface %d altsetting %d, skipping\n",
383 cfgno, inum, asnum);
384 goto skip_to_next_interface_descriptor;
385 }
386 }
387
388 ++intfc->num_altsetting;
389 memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
390
391 /* Skip over any Class Specific or Vendor Specific descriptors;
392 * find the first endpoint or interface descriptor */
393 alt->extra = buffer;
394 i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
395 USB_DT_INTERFACE, &n);
396 alt->extralen = i;
397 if (n > 0)
398 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
399 n, plural(n), "interface");
400 buffer += i;
401 size -= i;
402
403 /* Allocate space for the right(?) number of endpoints */
404 num_ep = num_ep_orig = alt->desc.bNumEndpoints;
405 alt->desc.bNumEndpoints = 0; /* Use as a counter */
406 if (num_ep > USB_MAXENDPOINTS) {
407 dev_warn(ddev, "too many endpoints for config %d interface %d "
408 "altsetting %d: %d, using maximum allowed: %d\n",
409 cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
410 num_ep = USB_MAXENDPOINTS;
411 }
412
413 if (num_ep > 0) {
414 /* Can't allocate 0 bytes */
415 len = sizeof(struct usb_host_endpoint) * num_ep;
416 alt->endpoint = kzalloc(len, GFP_KERNEL);
417 if (!alt->endpoint)
418 return -ENOMEM;
419 }
420
421 /* Parse all the endpoint descriptors */
422 n = 0;
423 while (size > 0) {
424 if (((struct usb_descriptor_header *) buffer)->bDescriptorType
425 == USB_DT_INTERFACE)
426 break;
427 retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
428 num_ep, buffer, size);
429 if (retval < 0)
430 return retval;
431 ++n;
432
433 buffer += retval;
434 size -= retval;
435 }
436
437 if (n != num_ep_orig)
438 dev_warn(ddev, "config %d interface %d altsetting %d has %d "
439 "endpoint descriptor%s, different from the interface "
440 "descriptor's value: %d\n",
441 cfgno, inum, asnum, n, plural(n), num_ep_orig);
442 return buffer - buffer0;
443
444 skip_to_next_interface_descriptor:
445 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
446 USB_DT_INTERFACE, NULL);
447 return buffer - buffer0 + i;
448 }
449
450 static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
451 struct usb_host_config *config, unsigned char *buffer, int size)
452 {
453 struct device *ddev = &dev->dev;
454 unsigned char *buffer0 = buffer;
455 int cfgno;
456 int nintf, nintf_orig;
457 int i, j, n;
458 struct usb_interface_cache *intfc;
459 unsigned char *buffer2;
460 int size2;
461 struct usb_descriptor_header *header;
462 int len, retval;
463 u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
464 unsigned iad_num = 0;
465
466 memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
467 if (config->desc.bDescriptorType != USB_DT_CONFIG ||
468 config->desc.bLength < USB_DT_CONFIG_SIZE ||
469 config->desc.bLength > size) {
470 dev_err(ddev, "invalid descriptor for config index %d: "
471 "type = 0x%X, length = %d\n", cfgidx,
472 config->desc.bDescriptorType, config->desc.bLength);
473 return -EINVAL;
474 }
475 cfgno = config->desc.bConfigurationValue;
476
477 buffer += config->desc.bLength;
478 size -= config->desc.bLength;
479
480 nintf = nintf_orig = config->desc.bNumInterfaces;
481 if (nintf > USB_MAXINTERFACES) {
482 dev_warn(ddev, "config %d has too many interfaces: %d, "
483 "using maximum allowed: %d\n",
484 cfgno, nintf, USB_MAXINTERFACES);
485 nintf = USB_MAXINTERFACES;
486 }
487
488 /* Go through the descriptors, checking their length and counting the
489 * number of altsettings for each interface */
490 n = 0;
491 for ((buffer2 = buffer, size2 = size);
492 size2 > 0;
493 (buffer2 += header->bLength, size2 -= header->bLength)) {
494
495 if (size2 < sizeof(struct usb_descriptor_header)) {
496 dev_warn(ddev, "config %d descriptor has %d excess "
497 "byte%s, ignoring\n",
498 cfgno, size2, plural(size2));
499 break;
500 }
501
502 header = (struct usb_descriptor_header *) buffer2;
503 if ((header->bLength > size2) || (header->bLength < 2)) {
504 dev_warn(ddev, "config %d has an invalid descriptor "
505 "of length %d, skipping remainder of the config\n",
506 cfgno, header->bLength);
507 break;
508 }
509
510 if (header->bDescriptorType == USB_DT_INTERFACE) {
511 struct usb_interface_descriptor *d;
512 int inum;
513
514 d = (struct usb_interface_descriptor *) header;
515 if (d->bLength < USB_DT_INTERFACE_SIZE) {
516 dev_warn(ddev, "config %d has an invalid "
517 "interface descriptor of length %d, "
518 "skipping\n", cfgno, d->bLength);
519 continue;
520 }
521
522 inum = d->bInterfaceNumber;
523
524 if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
525 n >= nintf_orig) {
526 dev_warn(ddev, "config %d has more interface "
527 "descriptors, than it declares in "
528 "bNumInterfaces, ignoring interface "
529 "number: %d\n", cfgno, inum);
530 continue;
531 }
532
533 if (inum >= nintf_orig)
534 dev_warn(ddev, "config %d has an invalid "
535 "interface number: %d but max is %d\n",
536 cfgno, inum, nintf_orig - 1);
537
538 /* Have we already encountered this interface?
539 * Count its altsettings */
540 for (i = 0; i < n; ++i) {
541 if (inums[i] == inum)
542 break;
543 }
544 if (i < n) {
545 if (nalts[i] < 255)
546 ++nalts[i];
547 } else if (n < USB_MAXINTERFACES) {
548 inums[n] = inum;
549 nalts[n] = 1;
550 ++n;
551 }
552
553 } else if (header->bDescriptorType ==
554 USB_DT_INTERFACE_ASSOCIATION) {
555 if (iad_num == USB_MAXIADS) {
556 dev_warn(ddev, "found more Interface "
557 "Association Descriptors "
558 "than allocated for in "
559 "configuration %d\n", cfgno);
560 } else {
561 config->intf_assoc[iad_num] =
562 (struct usb_interface_assoc_descriptor
563 *)header;
564 iad_num++;
565 }
566
567 } else if (header->bDescriptorType == USB_DT_DEVICE ||
568 header->bDescriptorType == USB_DT_CONFIG)
569 dev_warn(ddev, "config %d contains an unexpected "
570 "descriptor of type 0x%X, skipping\n",
571 cfgno, header->bDescriptorType);
572
573 } /* for ((buffer2 = buffer, size2 = size); ...) */
574 size = buffer2 - buffer;
575 config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
576
577 if (n != nintf)
578 dev_warn(ddev, "config %d has %d interface%s, different from "
579 "the descriptor's value: %d\n",
580 cfgno, n, plural(n), nintf_orig);
581 else if (n == 0)
582 dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
583 config->desc.bNumInterfaces = nintf = n;
584
585 /* Check for missing interface numbers */
586 for (i = 0; i < nintf; ++i) {
587 for (j = 0; j < nintf; ++j) {
588 if (inums[j] == i)
589 break;
590 }
591 if (j >= nintf)
592 dev_warn(ddev, "config %d has no interface number "
593 "%d\n", cfgno, i);
594 }
595
596 /* Allocate the usb_interface_caches and altsetting arrays */
597 for (i = 0; i < nintf; ++i) {
598 j = nalts[i];
599 if (j > USB_MAXALTSETTING) {
600 dev_warn(ddev, "too many alternate settings for "
601 "config %d interface %d: %d, "
602 "using maximum allowed: %d\n",
603 cfgno, inums[i], j, USB_MAXALTSETTING);
604 nalts[i] = j = USB_MAXALTSETTING;
605 }
606
607 len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
608 config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
609 if (!intfc)
610 return -ENOMEM;
611 kref_init(&intfc->ref);
612 }
613
614 /* FIXME: parse the BOS descriptor */
615
616 /* Skip over any Class Specific or Vendor Specific descriptors;
617 * find the first interface descriptor */
618 config->extra = buffer;
619 i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
620 USB_DT_INTERFACE, &n);
621 config->extralen = i;
622 if (n > 0)
623 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
624 n, plural(n), "configuration");
625 buffer += i;
626 size -= i;
627
628 /* Parse all the interface/altsetting descriptors */
629 while (size > 0) {
630 retval = usb_parse_interface(ddev, cfgno, config,
631 buffer, size, inums, nalts);
632 if (retval < 0)
633 return retval;
634
635 buffer += retval;
636 size -= retval;
637 }
638
639 /* Check for missing altsettings */
640 for (i = 0; i < nintf; ++i) {
641 intfc = config->intf_cache[i];
642 for (j = 0; j < intfc->num_altsetting; ++j) {
643 for (n = 0; n < intfc->num_altsetting; ++n) {
644 if (intfc->altsetting[n].desc.
645 bAlternateSetting == j)
646 break;
647 }
648 if (n >= intfc->num_altsetting)
649 dev_warn(ddev, "config %d interface %d has no "
650 "altsetting %d\n", cfgno, inums[i], j);
651 }
652 }
653
654 return 0;
655 }
656
657 /* hub-only!! ... and only exported for reset/reinit path.
658 * otherwise used internally on disconnect/destroy path
659 */
660 void usb_destroy_configuration(struct usb_device *dev)
661 {
662 int c, i;
663
664 if (!dev->config)
665 return;
666
667 if (dev->rawdescriptors) {
668 for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
669 kfree(dev->rawdescriptors[i]);
670
671 kfree(dev->rawdescriptors);
672 dev->rawdescriptors = NULL;
673 }
674
675 for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
676 struct usb_host_config *cf = &dev->config[c];
677
678 kfree(cf->string);
679 for (i = 0; i < cf->desc.bNumInterfaces; i++) {
680 if (cf->intf_cache[i])
681 kref_put(&cf->intf_cache[i]->ref,
682 usb_release_interface_cache);
683 }
684 }
685 kfree(dev->config);
686 dev->config = NULL;
687 }
688
689
690 /*
691 * Get the USB config descriptors, cache and parse'em
692 *
693 * hub-only!! ... and only in reset path, or usb_new_device()
694 * (used by real hubs and virtual root hubs)
695 */
696 int usb_get_configuration(struct usb_device *dev)
697 {
698 struct device *ddev = &dev->dev;
699 int ncfg = dev->descriptor.bNumConfigurations;
700 int result = 0;
701 unsigned int cfgno, length;
702 unsigned char *bigbuffer;
703 struct usb_config_descriptor *desc;
704
705 cfgno = 0;
706 result = -ENOMEM;
707 if (ncfg > USB_MAXCONFIG) {
708 dev_warn(ddev, "too many configurations: %d, "
709 "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
710 dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
711 }
712
713 if (ncfg < 1) {
714 dev_err(ddev, "no configurations\n");
715 return -EINVAL;
716 }
717
718 length = ncfg * sizeof(struct usb_host_config);
719 dev->config = kzalloc(length, GFP_KERNEL);
720 if (!dev->config)
721 goto err2;
722
723 length = ncfg * sizeof(char *);
724 dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
725 if (!dev->rawdescriptors)
726 goto err2;
727
728 desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
729 if (!desc)
730 goto err2;
731
732 result = 0;
733 for (; cfgno < ncfg; cfgno++) {
734 /* We grab just the first descriptor so we know how long
735 * the whole configuration is */
736 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
737 desc, USB_DT_CONFIG_SIZE);
738 if (result < 0) {
739 dev_err(ddev, "unable to read config index %d "
740 "descriptor/%s: %d\n", cfgno, "start", result);
741 if (result != -EPIPE)
742 goto err;
743 dev_err(ddev, "chopping to %d config(s)\n", cfgno);
744 dev->descriptor.bNumConfigurations = cfgno;
745 break;
746 } else if (result < 4) {
747 dev_err(ddev, "config index %d descriptor too short "
748 "(expected %i, got %i)\n", cfgno,
749 USB_DT_CONFIG_SIZE, result);
750 result = -EINVAL;
751 goto err;
752 }
753 length = max((int) le16_to_cpu(desc->wTotalLength),
754 USB_DT_CONFIG_SIZE);
755
756 /* Now that we know the length, get the whole thing */
757 bigbuffer = kmalloc(length, GFP_KERNEL);
758 if (!bigbuffer) {
759 result = -ENOMEM;
760 goto err;
761 }
762
763 if (dev->quirks & USB_QUIRK_DELAY_INIT)
764 msleep(100);
765
766 result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
767 bigbuffer, length);
768 if (result < 0) {
769 dev_err(ddev, "unable to read config index %d "
770 "descriptor/%s\n", cfgno, "all");
771 kfree(bigbuffer);
772 goto err;
773 }
774 if (result < length) {
775 dev_warn(ddev, "config index %d descriptor too short "
776 "(expected %i, got %i)\n", cfgno, length, result);
777 length = result;
778 }
779
780 dev->rawdescriptors[cfgno] = bigbuffer;
781
782 result = usb_parse_configuration(dev, cfgno,
783 &dev->config[cfgno], bigbuffer, length);
784 if (result < 0) {
785 ++cfgno;
786 goto err;
787 }
788 }
789 result = 0;
790
791 err:
792 kfree(desc);
793 dev->descriptor.bNumConfigurations = cfgno;
794 err2:
795 if (result == -ENOMEM)
796 dev_err(ddev, "out of memory\n");
797 return result;
798 }
799
800 void usb_release_bos_descriptor(struct usb_device *dev)
801 {
802 if (dev->bos) {
803 kfree(dev->bos->desc);
804 kfree(dev->bos);
805 dev->bos = NULL;
806 }
807 }
808
809 /* Get BOS descriptor set */
810 int usb_get_bos_descriptor(struct usb_device *dev)
811 {
812 struct device *ddev = &dev->dev;
813 struct usb_bos_descriptor *bos;
814 struct usb_dev_cap_header *cap;
815 unsigned char *buffer;
816 int length, total_len, num, i;
817 int ret;
818
819 bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
820 if (!bos)
821 return -ENOMEM;
822
823 /* Get BOS descriptor */
824 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, bos, USB_DT_BOS_SIZE);
825 if (ret < USB_DT_BOS_SIZE) {
826 dev_err(ddev, "unable to get BOS descriptor\n");
827 if (ret >= 0)
828 ret = -ENOMSG;
829 kfree(bos);
830 return ret;
831 }
832
833 length = bos->bLength;
834 total_len = le16_to_cpu(bos->wTotalLength);
835 num = bos->bNumDeviceCaps;
836 kfree(bos);
837 if (total_len < length)
838 return -EINVAL;
839
840 dev->bos = kzalloc(sizeof(struct usb_host_bos), GFP_KERNEL);
841 if (!dev->bos)
842 return -ENOMEM;
843
844 /* Now let's get the whole BOS descriptor set */
845 buffer = kzalloc(total_len, GFP_KERNEL);
846 if (!buffer) {
847 ret = -ENOMEM;
848 goto err;
849 }
850 dev->bos->desc = (struct usb_bos_descriptor *)buffer;
851
852 ret = usb_get_descriptor(dev, USB_DT_BOS, 0, buffer, total_len);
853 if (ret < total_len) {
854 dev_err(ddev, "unable to get BOS descriptor set\n");
855 if (ret >= 0)
856 ret = -ENOMSG;
857 goto err;
858 }
859 total_len -= length;
860
861 for (i = 0; i < num; i++) {
862 buffer += length;
863 cap = (struct usb_dev_cap_header *)buffer;
864 length = cap->bLength;
865
866 if (total_len < length)
867 break;
868 total_len -= length;
869
870 if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
871 dev_warn(ddev, "descriptor type invalid, skip\n");
872 continue;
873 }
874
875 switch (cap->bDevCapabilityType) {
876 case USB_CAP_TYPE_WIRELESS_USB:
877 /* Wireless USB cap descriptor is handled by wusb */
878 break;
879 case USB_CAP_TYPE_EXT:
880 dev->bos->ext_cap =
881 (struct usb_ext_cap_descriptor *)buffer;
882 break;
883 case USB_SS_CAP_TYPE:
884 dev->bos->ss_cap =
885 (struct usb_ss_cap_descriptor *)buffer;
886 break;
887 case USB_SSP_CAP_TYPE:
888 dev->bos->ssp_cap =
889 (struct usb_ssp_cap_descriptor *)buffer;
890 break;
891 case CONTAINER_ID_TYPE:
892 dev->bos->ss_id =
893 (struct usb_ss_container_id_descriptor *)buffer;
894 break;
895 case USB_PTM_CAP_TYPE:
896 dev->bos->ptm_cap =
897 (struct usb_ptm_cap_descriptor *)buffer;
898 default:
899 break;
900 }
901 }
902
903 return 0;
904
905 err:
906 usb_release_bos_descriptor(dev);
907 return ret;
908 }