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Commit | Line | Data |
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1da177e4 | 1 | #include <linux/usb.h> |
615ae11b | 2 | #include <linux/usb/ch9.h> |
1da177e4 LT |
3 | #include <linux/module.h> |
4 | #include <linux/init.h> | |
5 | #include <linux/slab.h> | |
6 | #include <linux/device.h> | |
7 | #include <asm/byteorder.h> | |
6d5e8254 GKH |
8 | #include "usb.h" |
9 | #include "hcd.h" | |
1da177e4 LT |
10 | |
11 | #define USB_MAXALTSETTING 128 /* Hard limit */ | |
12 | #define USB_MAXENDPOINTS 30 /* 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 | ||
663c30d0 SS |
22 | /* FIXME: this is a kludge */ |
23 | static int find_next_descriptor_more(unsigned char *buffer, int size, | |
24 | int dt1, int dt2, int dt3, int *num_skipped) | |
25 | { | |
26 | struct usb_descriptor_header *h; | |
27 | int n = 0; | |
28 | unsigned char *buffer0 = buffer; | |
29 | ||
30 | /* Find the next descriptor of type dt1 or dt2 or dt3 */ | |
31 | while (size > 0) { | |
32 | h = (struct usb_descriptor_header *) buffer; | |
33 | if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2 || | |
34 | h->bDescriptorType == dt3) | |
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 | ||
1da177e4 LT |
48 | static int find_next_descriptor(unsigned char *buffer, int size, |
49 | int dt1, int dt2, int *num_skipped) | |
50 | { | |
51 | struct usb_descriptor_header *h; | |
52 | int n = 0; | |
53 | unsigned char *buffer0 = buffer; | |
54 | ||
55 | /* Find the next descriptor of type dt1 or dt2 */ | |
56 | while (size > 0) { | |
57 | h = (struct usb_descriptor_header *) buffer; | |
58 | if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2) | |
59 | break; | |
60 | buffer += h->bLength; | |
61 | size -= h->bLength; | |
62 | ++n; | |
63 | } | |
64 | ||
65 | /* Store the number of descriptors skipped and return the | |
66 | * number of bytes skipped */ | |
67 | if (num_skipped) | |
68 | *num_skipped = n; | |
69 | return buffer - buffer0; | |
70 | } | |
71 | ||
f0058c62 | 72 | static int usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno, |
663c30d0 SS |
73 | int inum, int asnum, struct usb_host_endpoint *ep, |
74 | int num_ep, unsigned char *buffer, int size) | |
75 | { | |
76 | unsigned char *buffer_start = buffer; | |
f0058c62 | 77 | struct usb_ss_ep_comp_descriptor *desc; |
663c30d0 SS |
78 | int retval; |
79 | int num_skipped; | |
80 | int max_tx; | |
81 | int i; | |
82 | ||
f0058c62 | 83 | desc = (struct usb_ss_ep_comp_descriptor *) buffer; |
663c30d0 SS |
84 | if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP) { |
85 | dev_warn(ddev, "No SuperSpeed endpoint companion for config %d " | |
86 | " interface %d altsetting %d ep %d: " | |
87 | "using minimum values\n", | |
88 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
663c30d0 SS |
89 | /* |
90 | * The next descriptor is for an Endpoint or Interface, | |
91 | * no extra descriptors to copy into the companion structure, | |
92 | * and we didn't eat up any of the buffer. | |
93 | */ | |
9f8e4438 | 94 | return 0; |
663c30d0 | 95 | } |
f0058c62 SS |
96 | memcpy(&ep->ss_ep_comp->desc, desc, USB_DT_SS_EP_COMP_SIZE); |
97 | desc = &ep->ss_ep_comp->desc; | |
663c30d0 SS |
98 | buffer += desc->bLength; |
99 | size -= desc->bLength; | |
100 | ||
101 | /* Eat up the other descriptors we don't care about */ | |
f0058c62 | 102 | ep->ss_ep_comp->extra = buffer; |
663c30d0 SS |
103 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, |
104 | USB_DT_INTERFACE, &num_skipped); | |
f0058c62 | 105 | ep->ss_ep_comp->extralen = i; |
663c30d0 SS |
106 | buffer += i; |
107 | size -= i; | |
6682bb39 | 108 | retval = buffer - buffer_start; |
663c30d0 SS |
109 | if (num_skipped > 0) |
110 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
111 | num_skipped, plural(num_skipped), | |
112 | "SuperSpeed endpoint companion"); | |
113 | ||
114 | /* Check the various values */ | |
115 | if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) { | |
116 | dev_warn(ddev, "Control endpoint with bMaxBurst = %d in " | |
117 | "config %d interface %d altsetting %d ep %d: " | |
118 | "setting to zero\n", desc->bMaxBurst, | |
119 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
120 | desc->bMaxBurst = 0; | |
121 | } | |
122 | if (desc->bMaxBurst > 15) { | |
123 | dev_warn(ddev, "Endpoint with bMaxBurst = %d in " | |
124 | "config %d interface %d altsetting %d ep %d: " | |
125 | "setting to 15\n", desc->bMaxBurst, | |
126 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
127 | desc->bMaxBurst = 15; | |
128 | } | |
129 | if ((usb_endpoint_xfer_control(&ep->desc) || usb_endpoint_xfer_int(&ep->desc)) | |
130 | && desc->bmAttributes != 0) { | |
131 | dev_warn(ddev, "%s endpoint with bmAttributes = %d in " | |
132 | "config %d interface %d altsetting %d ep %d: " | |
133 | "setting to zero\n", | |
134 | usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk", | |
135 | desc->bmAttributes, | |
136 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
137 | desc->bmAttributes = 0; | |
138 | } | |
139 | if (usb_endpoint_xfer_bulk(&ep->desc) && desc->bmAttributes > 16) { | |
140 | dev_warn(ddev, "Bulk endpoint with more than 65536 streams in " | |
141 | "config %d interface %d altsetting %d ep %d: " | |
142 | "setting to max\n", | |
143 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
144 | desc->bmAttributes = 16; | |
145 | } | |
146 | if (usb_endpoint_xfer_isoc(&ep->desc) && desc->bmAttributes > 2) { | |
147 | dev_warn(ddev, "Isoc endpoint has Mult of %d in " | |
148 | "config %d interface %d altsetting %d ep %d: " | |
149 | "setting to 3\n", desc->bmAttributes + 1, | |
150 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
151 | desc->bmAttributes = 2; | |
152 | } | |
153 | if (usb_endpoint_xfer_isoc(&ep->desc)) { | |
154 | max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1) * | |
155 | (desc->bmAttributes + 1); | |
156 | } else if (usb_endpoint_xfer_int(&ep->desc)) { | |
157 | max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1); | |
158 | } else { | |
159 | goto valid; | |
160 | } | |
161 | if (desc->wBytesPerInterval > max_tx) { | |
162 | dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in " | |
163 | "config %d interface %d altsetting %d ep %d: " | |
164 | "setting to %d\n", | |
165 | usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int", | |
166 | desc->wBytesPerInterval, | |
167 | cfgno, inum, asnum, ep->desc.bEndpointAddress, | |
168 | max_tx); | |
169 | desc->wBytesPerInterval = max_tx; | |
170 | } | |
171 | valid: | |
172 | return retval; | |
173 | } | |
174 | ||
1da177e4 LT |
175 | static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, |
176 | int asnum, struct usb_host_interface *ifp, int num_ep, | |
177 | unsigned char *buffer, int size) | |
178 | { | |
179 | unsigned char *buffer0 = buffer; | |
180 | struct usb_endpoint_descriptor *d; | |
181 | struct usb_host_endpoint *endpoint; | |
663c30d0 | 182 | int n, i, j, retval; |
1da177e4 LT |
183 | |
184 | d = (struct usb_endpoint_descriptor *) buffer; | |
185 | buffer += d->bLength; | |
186 | size -= d->bLength; | |
187 | ||
188 | if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE) | |
189 | n = USB_DT_ENDPOINT_AUDIO_SIZE; | |
190 | else if (d->bLength >= USB_DT_ENDPOINT_SIZE) | |
191 | n = USB_DT_ENDPOINT_SIZE; | |
192 | else { | |
193 | dev_warn(ddev, "config %d interface %d altsetting %d has an " | |
194 | "invalid endpoint descriptor of length %d, skipping\n", | |
195 | cfgno, inum, asnum, d->bLength); | |
196 | goto skip_to_next_endpoint_or_interface_descriptor; | |
197 | } | |
198 | ||
199 | i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK; | |
200 | if (i >= 16 || i == 0) { | |
201 | dev_warn(ddev, "config %d interface %d altsetting %d has an " | |
202 | "invalid endpoint with address 0x%X, skipping\n", | |
203 | cfgno, inum, asnum, d->bEndpointAddress); | |
204 | goto skip_to_next_endpoint_or_interface_descriptor; | |
205 | } | |
206 | ||
207 | /* Only store as many endpoints as we have room for */ | |
208 | if (ifp->desc.bNumEndpoints >= num_ep) | |
209 | goto skip_to_next_endpoint_or_interface_descriptor; | |
210 | ||
211 | endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints]; | |
212 | ++ifp->desc.bNumEndpoints; | |
213 | ||
214 | memcpy(&endpoint->desc, d, n); | |
215 | INIT_LIST_HEAD(&endpoint->urb_list); | |
216 | ||
300871cd LP |
217 | /* Fix up bInterval values outside the legal range. Use 32 ms if no |
218 | * proper value can be guessed. */ | |
615ae11b AS |
219 | i = 0; /* i = min, j = max, n = default */ |
220 | j = 255; | |
221 | if (usb_endpoint_xfer_int(d)) { | |
222 | i = 1; | |
223 | switch (to_usb_device(ddev)->speed) { | |
6b403b02 | 224 | case USB_SPEED_SUPER: |
615ae11b | 225 | case USB_SPEED_HIGH: |
300871cd LP |
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 */ | |
615ae11b AS |
233 | j = 16; |
234 | break; | |
235 | default: /* USB_SPEED_FULL or _LOW */ | |
236 | /* For low-speed, 10 ms is the official minimum. | |
237 | * But some "overclocked" devices might want faster | |
238 | * polling so we'll allow it. */ | |
239 | n = 32; | |
240 | break; | |
241 | } | |
242 | } else if (usb_endpoint_xfer_isoc(d)) { | |
243 | i = 1; | |
244 | j = 16; | |
245 | switch (to_usb_device(ddev)->speed) { | |
246 | case USB_SPEED_HIGH: | |
247 | n = 9; /* 32 ms = 2^(9-1) uframes */ | |
248 | break; | |
249 | default: /* USB_SPEED_FULL */ | |
250 | n = 6; /* 32 ms = 2^(6-1) frames */ | |
251 | break; | |
252 | } | |
253 | } | |
254 | if (d->bInterval < i || d->bInterval > j) { | |
255 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
256 | "endpoint 0x%X has an invalid bInterval %d, " | |
257 | "changing to %d\n", | |
258 | cfgno, inum, asnum, | |
259 | d->bEndpointAddress, d->bInterval, n); | |
260 | endpoint->desc.bInterval = n; | |
261 | } | |
262 | ||
60aac1ec AS |
263 | /* Some buggy low-speed devices have Bulk endpoints, which is |
264 | * explicitly forbidden by the USB spec. In an attempt to make | |
265 | * them usable, we will try treating them as Interrupt endpoints. | |
266 | */ | |
267 | if (to_usb_device(ddev)->speed == USB_SPEED_LOW && | |
268 | usb_endpoint_xfer_bulk(d)) { | |
269 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
270 | "endpoint 0x%X is Bulk; changing to Interrupt\n", | |
271 | cfgno, inum, asnum, d->bEndpointAddress); | |
272 | endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT; | |
273 | endpoint->desc.bInterval = 1; | |
274 | if (le16_to_cpu(endpoint->desc.wMaxPacketSize) > 8) | |
275 | endpoint->desc.wMaxPacketSize = cpu_to_le16(8); | |
276 | } | |
277 | ||
caa9ef67 DB |
278 | /* |
279 | * Some buggy high speed devices have bulk endpoints using | |
280 | * maxpacket sizes other than 512. High speed HCDs may not | |
281 | * be able to handle that particular bug, so let's warn... | |
282 | */ | |
283 | if (to_usb_device(ddev)->speed == USB_SPEED_HIGH | |
284 | && usb_endpoint_xfer_bulk(d)) { | |
285 | unsigned maxp; | |
286 | ||
287 | maxp = le16_to_cpu(endpoint->desc.wMaxPacketSize) & 0x07ff; | |
288 | if (maxp != 512) | |
289 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
290 | "bulk endpoint 0x%X has invalid maxpacket %d\n", | |
291 | cfgno, inum, asnum, d->bEndpointAddress, | |
292 | maxp); | |
293 | } | |
f0058c62 | 294 | /* Allocate room for and parse any SS endpoint companion descriptors */ |
663c30d0 SS |
295 | if (to_usb_device(ddev)->speed == USB_SPEED_SUPER) { |
296 | endpoint->extra = buffer; | |
297 | i = find_next_descriptor_more(buffer, size, USB_DT_SS_ENDPOINT_COMP, | |
298 | USB_DT_ENDPOINT, USB_DT_INTERFACE, &n); | |
299 | endpoint->extralen = i; | |
300 | buffer += i; | |
301 | size -= i; | |
302 | ||
9f8e4438 SS |
303 | /* Allocate space for the SS endpoint companion descriptor */ |
304 | endpoint->ss_ep_comp = kzalloc(sizeof(struct usb_host_ss_ep_comp), | |
305 | GFP_KERNEL); | |
306 | if (!endpoint->ss_ep_comp) | |
307 | return -ENOMEM; | |
308 | ||
309 | /* Fill in some default values (may be overwritten later) */ | |
310 | endpoint->ss_ep_comp->desc.bLength = USB_DT_SS_EP_COMP_SIZE; | |
311 | endpoint->ss_ep_comp->desc.bDescriptorType = USB_DT_SS_ENDPOINT_COMP; | |
312 | endpoint->ss_ep_comp->desc.bMaxBurst = 0; | |
313 | /* | |
314 | * Leave bmAttributes as zero, which will mean no streams for | |
315 | * bulk, and isoc won't support multiple bursts of packets. | |
316 | * With bursts of only one packet, and a Mult of 1, the max | |
317 | * amount of data moved per endpoint service interval is one | |
318 | * packet. | |
319 | */ | |
320 | if (usb_endpoint_xfer_isoc(&endpoint->desc) || | |
321 | usb_endpoint_xfer_int(&endpoint->desc)) | |
322 | endpoint->ss_ep_comp->desc.wBytesPerInterval = | |
323 | endpoint->desc.wMaxPacketSize; | |
324 | ||
663c30d0 | 325 | if (size > 0) { |
f0058c62 SS |
326 | retval = usb_parse_ss_endpoint_companion(ddev, cfgno, |
327 | inum, asnum, endpoint, num_ep, buffer, | |
328 | size); | |
663c30d0 SS |
329 | if (retval >= 0) { |
330 | buffer += retval; | |
331 | retval = buffer - buffer0; | |
332 | } | |
333 | } else { | |
9f8e4438 SS |
334 | dev_warn(ddev, "config %d interface %d altsetting %d " |
335 | "endpoint 0x%X has no " | |
336 | "SuperSpeed companion descriptor\n", | |
337 | cfgno, inum, asnum, d->bEndpointAddress); | |
663c30d0 SS |
338 | retval = buffer - buffer0; |
339 | } | |
340 | } else { | |
341 | /* Skip over any Class Specific or Vendor Specific descriptors; | |
342 | * find the next endpoint or interface descriptor */ | |
343 | endpoint->extra = buffer; | |
344 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
345 | USB_DT_INTERFACE, &n); | |
346 | endpoint->extralen = i; | |
347 | retval = buffer - buffer0 + i; | |
348 | } | |
1da177e4 LT |
349 | if (n > 0) |
350 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
351 | n, plural(n), "endpoint"); | |
663c30d0 | 352 | return retval; |
1da177e4 LT |
353 | |
354 | skip_to_next_endpoint_or_interface_descriptor: | |
355 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
356 | USB_DT_INTERFACE, NULL); | |
357 | return buffer - buffer0 + i; | |
358 | } | |
359 | ||
360 | void usb_release_interface_cache(struct kref *ref) | |
361 | { | |
362 | struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref); | |
363 | int j; | |
364 | ||
4f62efe6 AS |
365 | for (j = 0; j < intfc->num_altsetting; j++) { |
366 | struct usb_host_interface *alt = &intfc->altsetting[j]; | |
367 | ||
368 | kfree(alt->endpoint); | |
369 | kfree(alt->string); | |
370 | } | |
1da177e4 LT |
371 | kfree(intfc); |
372 | } | |
373 | ||
374 | static int usb_parse_interface(struct device *ddev, int cfgno, | |
375 | struct usb_host_config *config, unsigned char *buffer, int size, | |
376 | u8 inums[], u8 nalts[]) | |
377 | { | |
378 | unsigned char *buffer0 = buffer; | |
379 | struct usb_interface_descriptor *d; | |
380 | int inum, asnum; | |
381 | struct usb_interface_cache *intfc; | |
382 | struct usb_host_interface *alt; | |
383 | int i, n; | |
384 | int len, retval; | |
385 | int num_ep, num_ep_orig; | |
386 | ||
387 | d = (struct usb_interface_descriptor *) buffer; | |
388 | buffer += d->bLength; | |
389 | size -= d->bLength; | |
390 | ||
391 | if (d->bLength < USB_DT_INTERFACE_SIZE) | |
392 | goto skip_to_next_interface_descriptor; | |
393 | ||
394 | /* Which interface entry is this? */ | |
395 | intfc = NULL; | |
396 | inum = d->bInterfaceNumber; | |
397 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
398 | if (inums[i] == inum) { | |
399 | intfc = config->intf_cache[i]; | |
400 | break; | |
401 | } | |
402 | } | |
403 | if (!intfc || intfc->num_altsetting >= nalts[i]) | |
404 | goto skip_to_next_interface_descriptor; | |
405 | ||
406 | /* Check for duplicate altsetting entries */ | |
407 | asnum = d->bAlternateSetting; | |
408 | for ((i = 0, alt = &intfc->altsetting[0]); | |
409 | i < intfc->num_altsetting; | |
410 | (++i, ++alt)) { | |
411 | if (alt->desc.bAlternateSetting == asnum) { | |
412 | dev_warn(ddev, "Duplicate descriptor for config %d " | |
413 | "interface %d altsetting %d, skipping\n", | |
414 | cfgno, inum, asnum); | |
415 | goto skip_to_next_interface_descriptor; | |
416 | } | |
417 | } | |
418 | ||
419 | ++intfc->num_altsetting; | |
420 | memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE); | |
421 | ||
422 | /* Skip over any Class Specific or Vendor Specific descriptors; | |
423 | * find the first endpoint or interface descriptor */ | |
424 | alt->extra = buffer; | |
425 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
426 | USB_DT_INTERFACE, &n); | |
427 | alt->extralen = i; | |
428 | if (n > 0) | |
429 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
430 | n, plural(n), "interface"); | |
431 | buffer += i; | |
432 | size -= i; | |
433 | ||
434 | /* Allocate space for the right(?) number of endpoints */ | |
435 | num_ep = num_ep_orig = alt->desc.bNumEndpoints; | |
2c044a48 | 436 | alt->desc.bNumEndpoints = 0; /* Use as a counter */ |
1da177e4 LT |
437 | if (num_ep > USB_MAXENDPOINTS) { |
438 | dev_warn(ddev, "too many endpoints for config %d interface %d " | |
439 | "altsetting %d: %d, using maximum allowed: %d\n", | |
440 | cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS); | |
441 | num_ep = USB_MAXENDPOINTS; | |
442 | } | |
443 | ||
2c044a48 GKH |
444 | if (num_ep > 0) { |
445 | /* Can't allocate 0 bytes */ | |
57a21c1b AS |
446 | len = sizeof(struct usb_host_endpoint) * num_ep; |
447 | alt->endpoint = kzalloc(len, GFP_KERNEL); | |
448 | if (!alt->endpoint) | |
449 | return -ENOMEM; | |
450 | } | |
1da177e4 LT |
451 | |
452 | /* Parse all the endpoint descriptors */ | |
453 | n = 0; | |
454 | while (size > 0) { | |
455 | if (((struct usb_descriptor_header *) buffer)->bDescriptorType | |
456 | == USB_DT_INTERFACE) | |
457 | break; | |
458 | retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt, | |
459 | num_ep, buffer, size); | |
460 | if (retval < 0) | |
461 | return retval; | |
462 | ++n; | |
463 | ||
464 | buffer += retval; | |
465 | size -= retval; | |
466 | } | |
467 | ||
468 | if (n != num_ep_orig) | |
469 | dev_warn(ddev, "config %d interface %d altsetting %d has %d " | |
470 | "endpoint descriptor%s, different from the interface " | |
471 | "descriptor's value: %d\n", | |
472 | cfgno, inum, asnum, n, plural(n), num_ep_orig); | |
473 | return buffer - buffer0; | |
474 | ||
475 | skip_to_next_interface_descriptor: | |
476 | i = find_next_descriptor(buffer, size, USB_DT_INTERFACE, | |
477 | USB_DT_INTERFACE, NULL); | |
478 | return buffer - buffer0 + i; | |
479 | } | |
480 | ||
481 | static int usb_parse_configuration(struct device *ddev, int cfgidx, | |
482 | struct usb_host_config *config, unsigned char *buffer, int size) | |
483 | { | |
484 | unsigned char *buffer0 = buffer; | |
485 | int cfgno; | |
486 | int nintf, nintf_orig; | |
487 | int i, j, n; | |
488 | struct usb_interface_cache *intfc; | |
489 | unsigned char *buffer2; | |
490 | int size2; | |
491 | struct usb_descriptor_header *header; | |
492 | int len, retval; | |
493 | u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES]; | |
165fe97e | 494 | unsigned iad_num = 0; |
1da177e4 LT |
495 | |
496 | memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE); | |
497 | if (config->desc.bDescriptorType != USB_DT_CONFIG || | |
498 | config->desc.bLength < USB_DT_CONFIG_SIZE) { | |
499 | dev_err(ddev, "invalid descriptor for config index %d: " | |
500 | "type = 0x%X, length = %d\n", cfgidx, | |
501 | config->desc.bDescriptorType, config->desc.bLength); | |
502 | return -EINVAL; | |
503 | } | |
504 | cfgno = config->desc.bConfigurationValue; | |
505 | ||
506 | buffer += config->desc.bLength; | |
507 | size -= config->desc.bLength; | |
508 | ||
509 | nintf = nintf_orig = config->desc.bNumInterfaces; | |
510 | if (nintf > USB_MAXINTERFACES) { | |
511 | dev_warn(ddev, "config %d has too many interfaces: %d, " | |
512 | "using maximum allowed: %d\n", | |
513 | cfgno, nintf, USB_MAXINTERFACES); | |
514 | nintf = USB_MAXINTERFACES; | |
515 | } | |
516 | ||
517 | /* Go through the descriptors, checking their length and counting the | |
518 | * number of altsettings for each interface */ | |
519 | n = 0; | |
520 | for ((buffer2 = buffer, size2 = size); | |
521 | size2 > 0; | |
522 | (buffer2 += header->bLength, size2 -= header->bLength)) { | |
523 | ||
524 | if (size2 < sizeof(struct usb_descriptor_header)) { | |
525 | dev_warn(ddev, "config %d descriptor has %d excess " | |
526 | "byte%s, ignoring\n", | |
527 | cfgno, size2, plural(size2)); | |
528 | break; | |
529 | } | |
530 | ||
531 | header = (struct usb_descriptor_header *) buffer2; | |
532 | if ((header->bLength > size2) || (header->bLength < 2)) { | |
533 | dev_warn(ddev, "config %d has an invalid descriptor " | |
534 | "of length %d, skipping remainder of the config\n", | |
535 | cfgno, header->bLength); | |
536 | break; | |
537 | } | |
538 | ||
539 | if (header->bDescriptorType == USB_DT_INTERFACE) { | |
540 | struct usb_interface_descriptor *d; | |
541 | int inum; | |
542 | ||
543 | d = (struct usb_interface_descriptor *) header; | |
544 | if (d->bLength < USB_DT_INTERFACE_SIZE) { | |
545 | dev_warn(ddev, "config %d has an invalid " | |
546 | "interface descriptor of length %d, " | |
547 | "skipping\n", cfgno, d->bLength); | |
548 | continue; | |
549 | } | |
550 | ||
551 | inum = d->bInterfaceNumber; | |
552 | if (inum >= nintf_orig) | |
553 | dev_warn(ddev, "config %d has an invalid " | |
554 | "interface number: %d but max is %d\n", | |
555 | cfgno, inum, nintf_orig - 1); | |
556 | ||
557 | /* Have we already encountered this interface? | |
558 | * Count its altsettings */ | |
559 | for (i = 0; i < n; ++i) { | |
560 | if (inums[i] == inum) | |
561 | break; | |
562 | } | |
563 | if (i < n) { | |
564 | if (nalts[i] < 255) | |
565 | ++nalts[i]; | |
566 | } else if (n < USB_MAXINTERFACES) { | |
567 | inums[n] = inum; | |
568 | nalts[n] = 1; | |
569 | ++n; | |
570 | } | |
571 | ||
165fe97e CN |
572 | } else if (header->bDescriptorType == |
573 | USB_DT_INTERFACE_ASSOCIATION) { | |
574 | if (iad_num == USB_MAXIADS) { | |
575 | dev_warn(ddev, "found more Interface " | |
576 | "Association Descriptors " | |
577 | "than allocated for in " | |
578 | "configuration %d\n", cfgno); | |
579 | } else { | |
580 | config->intf_assoc[iad_num] = | |
581 | (struct usb_interface_assoc_descriptor | |
582 | *)header; | |
583 | iad_num++; | |
584 | } | |
585 | ||
1da177e4 LT |
586 | } else if (header->bDescriptorType == USB_DT_DEVICE || |
587 | header->bDescriptorType == USB_DT_CONFIG) | |
588 | dev_warn(ddev, "config %d contains an unexpected " | |
589 | "descriptor of type 0x%X, skipping\n", | |
590 | cfgno, header->bDescriptorType); | |
591 | ||
592 | } /* for ((buffer2 = buffer, size2 = size); ...) */ | |
593 | size = buffer2 - buffer; | |
594 | config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0); | |
595 | ||
596 | if (n != nintf) | |
597 | dev_warn(ddev, "config %d has %d interface%s, different from " | |
598 | "the descriptor's value: %d\n", | |
599 | cfgno, n, plural(n), nintf_orig); | |
600 | else if (n == 0) | |
601 | dev_warn(ddev, "config %d has no interfaces?\n", cfgno); | |
602 | config->desc.bNumInterfaces = nintf = n; | |
603 | ||
604 | /* Check for missing interface numbers */ | |
605 | for (i = 0; i < nintf; ++i) { | |
606 | for (j = 0; j < nintf; ++j) { | |
607 | if (inums[j] == i) | |
608 | break; | |
609 | } | |
610 | if (j >= nintf) | |
611 | dev_warn(ddev, "config %d has no interface number " | |
612 | "%d\n", cfgno, i); | |
613 | } | |
614 | ||
615 | /* Allocate the usb_interface_caches and altsetting arrays */ | |
616 | for (i = 0; i < nintf; ++i) { | |
617 | j = nalts[i]; | |
618 | if (j > USB_MAXALTSETTING) { | |
619 | dev_warn(ddev, "too many alternate settings for " | |
620 | "config %d interface %d: %d, " | |
621 | "using maximum allowed: %d\n", | |
622 | cfgno, inums[i], j, USB_MAXALTSETTING); | |
623 | nalts[i] = j = USB_MAXALTSETTING; | |
624 | } | |
625 | ||
626 | len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j; | |
0a1ef3b5 | 627 | config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL); |
1da177e4 LT |
628 | if (!intfc) |
629 | return -ENOMEM; | |
1da177e4 LT |
630 | kref_init(&intfc->ref); |
631 | } | |
632 | ||
663c30d0 SS |
633 | /* FIXME: parse the BOS descriptor */ |
634 | ||
1da177e4 LT |
635 | /* Skip over any Class Specific or Vendor Specific descriptors; |
636 | * find the first interface descriptor */ | |
637 | config->extra = buffer; | |
638 | i = find_next_descriptor(buffer, size, USB_DT_INTERFACE, | |
639 | USB_DT_INTERFACE, &n); | |
640 | config->extralen = i; | |
641 | if (n > 0) | |
642 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
643 | n, plural(n), "configuration"); | |
644 | buffer += i; | |
645 | size -= i; | |
646 | ||
647 | /* Parse all the interface/altsetting descriptors */ | |
648 | while (size > 0) { | |
649 | retval = usb_parse_interface(ddev, cfgno, config, | |
650 | buffer, size, inums, nalts); | |
651 | if (retval < 0) | |
652 | return retval; | |
653 | ||
654 | buffer += retval; | |
655 | size -= retval; | |
656 | } | |
657 | ||
658 | /* Check for missing altsettings */ | |
659 | for (i = 0; i < nintf; ++i) { | |
660 | intfc = config->intf_cache[i]; | |
661 | for (j = 0; j < intfc->num_altsetting; ++j) { | |
662 | for (n = 0; n < intfc->num_altsetting; ++n) { | |
663 | if (intfc->altsetting[n].desc. | |
664 | bAlternateSetting == j) | |
665 | break; | |
666 | } | |
667 | if (n >= intfc->num_altsetting) | |
668 | dev_warn(ddev, "config %d interface %d has no " | |
669 | "altsetting %d\n", cfgno, inums[i], j); | |
670 | } | |
671 | } | |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
2c044a48 GKH |
676 | /* hub-only!! ... and only exported for reset/reinit path. |
677 | * otherwise used internally on disconnect/destroy path | |
678 | */ | |
1da177e4 LT |
679 | void usb_destroy_configuration(struct usb_device *dev) |
680 | { | |
681 | int c, i; | |
682 | ||
683 | if (!dev->config) | |
684 | return; | |
685 | ||
686 | if (dev->rawdescriptors) { | |
687 | for (i = 0; i < dev->descriptor.bNumConfigurations; i++) | |
688 | kfree(dev->rawdescriptors[i]); | |
689 | ||
690 | kfree(dev->rawdescriptors); | |
691 | dev->rawdescriptors = NULL; | |
692 | } | |
693 | ||
694 | for (c = 0; c < dev->descriptor.bNumConfigurations; c++) { | |
695 | struct usb_host_config *cf = &dev->config[c]; | |
696 | ||
697 | kfree(cf->string); | |
1da177e4 LT |
698 | for (i = 0; i < cf->desc.bNumInterfaces; i++) { |
699 | if (cf->intf_cache[i]) | |
2c044a48 | 700 | kref_put(&cf->intf_cache[i]->ref, |
1da177e4 LT |
701 | usb_release_interface_cache); |
702 | } | |
703 | } | |
704 | kfree(dev->config); | |
705 | dev->config = NULL; | |
706 | } | |
707 | ||
708 | ||
1145065c IPG |
709 | /* |
710 | * Get the USB config descriptors, cache and parse'em | |
711 | * | |
712 | * hub-only!! ... and only in reset path, or usb_new_device() | |
713 | * (used by real hubs and virtual root hubs) | |
714 | * | |
715 | * NOTE: if this is a WUSB device and is not authorized, we skip the | |
716 | * whole thing. A non-authorized USB device has no | |
717 | * configurations. | |
718 | */ | |
1da177e4 LT |
719 | int usb_get_configuration(struct usb_device *dev) |
720 | { | |
721 | struct device *ddev = &dev->dev; | |
722 | int ncfg = dev->descriptor.bNumConfigurations; | |
1145065c | 723 | int result = 0; |
1da177e4 LT |
724 | unsigned int cfgno, length; |
725 | unsigned char *buffer; | |
726 | unsigned char *bigbuffer; | |
2c044a48 | 727 | struct usb_config_descriptor *desc; |
1da177e4 | 728 | |
1145065c IPG |
729 | cfgno = 0; |
730 | if (dev->authorized == 0) /* Not really an error */ | |
731 | goto out_not_authorized; | |
732 | result = -ENOMEM; | |
1da177e4 LT |
733 | if (ncfg > USB_MAXCONFIG) { |
734 | dev_warn(ddev, "too many configurations: %d, " | |
735 | "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG); | |
736 | dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG; | |
737 | } | |
738 | ||
739 | if (ncfg < 1) { | |
740 | dev_err(ddev, "no configurations\n"); | |
741 | return -EINVAL; | |
742 | } | |
743 | ||
744 | length = ncfg * sizeof(struct usb_host_config); | |
0a1ef3b5 | 745 | dev->config = kzalloc(length, GFP_KERNEL); |
1da177e4 LT |
746 | if (!dev->config) |
747 | goto err2; | |
1da177e4 LT |
748 | |
749 | length = ncfg * sizeof(char *); | |
0a1ef3b5 | 750 | dev->rawdescriptors = kzalloc(length, GFP_KERNEL); |
1da177e4 LT |
751 | if (!dev->rawdescriptors) |
752 | goto err2; | |
1da177e4 LT |
753 | |
754 | buffer = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL); | |
755 | if (!buffer) | |
756 | goto err2; | |
757 | desc = (struct usb_config_descriptor *)buffer; | |
758 | ||
1145065c IPG |
759 | result = 0; |
760 | for (; cfgno < ncfg; cfgno++) { | |
1da177e4 LT |
761 | /* We grab just the first descriptor so we know how long |
762 | * the whole configuration is */ | |
763 | result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, | |
764 | buffer, USB_DT_CONFIG_SIZE); | |
765 | if (result < 0) { | |
766 | dev_err(ddev, "unable to read config index %d " | |
1145065c | 767 | "descriptor/%s: %d\n", cfgno, "start", result); |
cb4c8fe5 IPG |
768 | dev_err(ddev, "chopping to %d config(s)\n", cfgno); |
769 | dev->descriptor.bNumConfigurations = cfgno; | |
770 | break; | |
1da177e4 LT |
771 | } else if (result < 4) { |
772 | dev_err(ddev, "config index %d descriptor too short " | |
773 | "(expected %i, got %i)\n", cfgno, | |
774 | USB_DT_CONFIG_SIZE, result); | |
775 | result = -EINVAL; | |
776 | goto err; | |
777 | } | |
778 | length = max((int) le16_to_cpu(desc->wTotalLength), | |
779 | USB_DT_CONFIG_SIZE); | |
780 | ||
781 | /* Now that we know the length, get the whole thing */ | |
782 | bigbuffer = kmalloc(length, GFP_KERNEL); | |
783 | if (!bigbuffer) { | |
784 | result = -ENOMEM; | |
785 | goto err; | |
786 | } | |
787 | result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, | |
788 | bigbuffer, length); | |
789 | if (result < 0) { | |
790 | dev_err(ddev, "unable to read config index %d " | |
791 | "descriptor/%s\n", cfgno, "all"); | |
792 | kfree(bigbuffer); | |
793 | goto err; | |
794 | } | |
795 | if (result < length) { | |
796 | dev_warn(ddev, "config index %d descriptor too short " | |
797 | "(expected %i, got %i)\n", cfgno, length, result); | |
798 | length = result; | |
799 | } | |
800 | ||
801 | dev->rawdescriptors[cfgno] = bigbuffer; | |
802 | ||
803 | result = usb_parse_configuration(&dev->dev, cfgno, | |
804 | &dev->config[cfgno], bigbuffer, length); | |
805 | if (result < 0) { | |
806 | ++cfgno; | |
807 | goto err; | |
808 | } | |
809 | } | |
810 | result = 0; | |
811 | ||
812 | err: | |
813 | kfree(buffer); | |
1145065c | 814 | out_not_authorized: |
1da177e4 LT |
815 | dev->descriptor.bNumConfigurations = cfgno; |
816 | err2: | |
817 | if (result == -ENOMEM) | |
818 | dev_err(ddev, "out of memory\n"); | |
819 | return result; | |
820 | } |