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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 SS |
83 | /* Allocate space for the SS endpoint companion descriptor */ |
84 | ep->ss_ep_comp = kzalloc(sizeof(struct usb_host_ss_ep_comp), | |
85 | GFP_KERNEL); | |
86 | if (!ep->ss_ep_comp) | |
663c30d0 | 87 | return -ENOMEM; |
f0058c62 | 88 | desc = (struct usb_ss_ep_comp_descriptor *) buffer; |
663c30d0 SS |
89 | if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP) { |
90 | dev_warn(ddev, "No SuperSpeed endpoint companion for config %d " | |
91 | " interface %d altsetting %d ep %d: " | |
92 | "using minimum values\n", | |
93 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
f0058c62 SS |
94 | ep->ss_ep_comp->desc.bLength = USB_DT_SS_EP_COMP_SIZE; |
95 | ep->ss_ep_comp->desc.bDescriptorType = USB_DT_SS_ENDPOINT_COMP; | |
96 | ep->ss_ep_comp->desc.bMaxBurst = 0; | |
663c30d0 SS |
97 | /* |
98 | * Leave bmAttributes as zero, which will mean no streams for | |
99 | * bulk, and isoc won't support multiple bursts of packets. | |
100 | * With bursts of only one packet, and a Mult of 1, the max | |
101 | * amount of data moved per endpoint service interval is one | |
102 | * packet. | |
103 | */ | |
104 | if (usb_endpoint_xfer_isoc(&ep->desc) || | |
105 | usb_endpoint_xfer_int(&ep->desc)) | |
f0058c62 | 106 | ep->ss_ep_comp->desc.wBytesPerInterval = |
663c30d0 SS |
107 | ep->desc.wMaxPacketSize; |
108 | /* | |
109 | * The next descriptor is for an Endpoint or Interface, | |
110 | * no extra descriptors to copy into the companion structure, | |
111 | * and we didn't eat up any of the buffer. | |
112 | */ | |
113 | retval = 0; | |
114 | goto valid; | |
115 | } | |
f0058c62 SS |
116 | memcpy(&ep->ss_ep_comp->desc, desc, USB_DT_SS_EP_COMP_SIZE); |
117 | desc = &ep->ss_ep_comp->desc; | |
663c30d0 SS |
118 | buffer += desc->bLength; |
119 | size -= desc->bLength; | |
120 | ||
121 | /* Eat up the other descriptors we don't care about */ | |
f0058c62 | 122 | ep->ss_ep_comp->extra = buffer; |
663c30d0 SS |
123 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, |
124 | USB_DT_INTERFACE, &num_skipped); | |
f0058c62 | 125 | ep->ss_ep_comp->extralen = i; |
663c30d0 SS |
126 | buffer += i; |
127 | size -= i; | |
128 | retval = buffer - buffer_start + i; | |
129 | if (num_skipped > 0) | |
130 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
131 | num_skipped, plural(num_skipped), | |
132 | "SuperSpeed endpoint companion"); | |
133 | ||
134 | /* Check the various values */ | |
135 | if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) { | |
136 | dev_warn(ddev, "Control endpoint with bMaxBurst = %d in " | |
137 | "config %d interface %d altsetting %d ep %d: " | |
138 | "setting to zero\n", desc->bMaxBurst, | |
139 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
140 | desc->bMaxBurst = 0; | |
141 | } | |
142 | if (desc->bMaxBurst > 15) { | |
143 | dev_warn(ddev, "Endpoint with bMaxBurst = %d in " | |
144 | "config %d interface %d altsetting %d ep %d: " | |
145 | "setting to 15\n", desc->bMaxBurst, | |
146 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
147 | desc->bMaxBurst = 15; | |
148 | } | |
149 | if ((usb_endpoint_xfer_control(&ep->desc) || usb_endpoint_xfer_int(&ep->desc)) | |
150 | && desc->bmAttributes != 0) { | |
151 | dev_warn(ddev, "%s endpoint with bmAttributes = %d in " | |
152 | "config %d interface %d altsetting %d ep %d: " | |
153 | "setting to zero\n", | |
154 | usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk", | |
155 | desc->bmAttributes, | |
156 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
157 | desc->bmAttributes = 0; | |
158 | } | |
159 | if (usb_endpoint_xfer_bulk(&ep->desc) && desc->bmAttributes > 16) { | |
160 | dev_warn(ddev, "Bulk endpoint with more than 65536 streams in " | |
161 | "config %d interface %d altsetting %d ep %d: " | |
162 | "setting to max\n", | |
163 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
164 | desc->bmAttributes = 16; | |
165 | } | |
166 | if (usb_endpoint_xfer_isoc(&ep->desc) && desc->bmAttributes > 2) { | |
167 | dev_warn(ddev, "Isoc endpoint has Mult of %d in " | |
168 | "config %d interface %d altsetting %d ep %d: " | |
169 | "setting to 3\n", desc->bmAttributes + 1, | |
170 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
171 | desc->bmAttributes = 2; | |
172 | } | |
173 | if (usb_endpoint_xfer_isoc(&ep->desc)) { | |
174 | max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1) * | |
175 | (desc->bmAttributes + 1); | |
176 | } else if (usb_endpoint_xfer_int(&ep->desc)) { | |
177 | max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1); | |
178 | } else { | |
179 | goto valid; | |
180 | } | |
181 | if (desc->wBytesPerInterval > max_tx) { | |
182 | dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in " | |
183 | "config %d interface %d altsetting %d ep %d: " | |
184 | "setting to %d\n", | |
185 | usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int", | |
186 | desc->wBytesPerInterval, | |
187 | cfgno, inum, asnum, ep->desc.bEndpointAddress, | |
188 | max_tx); | |
189 | desc->wBytesPerInterval = max_tx; | |
190 | } | |
191 | valid: | |
192 | return retval; | |
193 | } | |
194 | ||
1da177e4 LT |
195 | static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, |
196 | int asnum, struct usb_host_interface *ifp, int num_ep, | |
197 | unsigned char *buffer, int size) | |
198 | { | |
199 | unsigned char *buffer0 = buffer; | |
200 | struct usb_endpoint_descriptor *d; | |
201 | struct usb_host_endpoint *endpoint; | |
663c30d0 | 202 | int n, i, j, retval; |
1da177e4 LT |
203 | |
204 | d = (struct usb_endpoint_descriptor *) buffer; | |
205 | buffer += d->bLength; | |
206 | size -= d->bLength; | |
207 | ||
208 | if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE) | |
209 | n = USB_DT_ENDPOINT_AUDIO_SIZE; | |
210 | else if (d->bLength >= USB_DT_ENDPOINT_SIZE) | |
211 | n = USB_DT_ENDPOINT_SIZE; | |
212 | else { | |
213 | dev_warn(ddev, "config %d interface %d altsetting %d has an " | |
214 | "invalid endpoint descriptor of length %d, skipping\n", | |
215 | cfgno, inum, asnum, d->bLength); | |
216 | goto skip_to_next_endpoint_or_interface_descriptor; | |
217 | } | |
218 | ||
219 | i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK; | |
220 | if (i >= 16 || i == 0) { | |
221 | dev_warn(ddev, "config %d interface %d altsetting %d has an " | |
222 | "invalid endpoint with address 0x%X, skipping\n", | |
223 | cfgno, inum, asnum, d->bEndpointAddress); | |
224 | goto skip_to_next_endpoint_or_interface_descriptor; | |
225 | } | |
226 | ||
227 | /* Only store as many endpoints as we have room for */ | |
228 | if (ifp->desc.bNumEndpoints >= num_ep) | |
229 | goto skip_to_next_endpoint_or_interface_descriptor; | |
230 | ||
231 | endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints]; | |
232 | ++ifp->desc.bNumEndpoints; | |
233 | ||
234 | memcpy(&endpoint->desc, d, n); | |
235 | INIT_LIST_HEAD(&endpoint->urb_list); | |
236 | ||
300871cd LP |
237 | /* Fix up bInterval values outside the legal range. Use 32 ms if no |
238 | * proper value can be guessed. */ | |
615ae11b AS |
239 | i = 0; /* i = min, j = max, n = default */ |
240 | j = 255; | |
241 | if (usb_endpoint_xfer_int(d)) { | |
242 | i = 1; | |
243 | switch (to_usb_device(ddev)->speed) { | |
6b403b02 | 244 | case USB_SPEED_SUPER: |
615ae11b | 245 | case USB_SPEED_HIGH: |
300871cd LP |
246 | /* Many device manufacturers are using full-speed |
247 | * bInterval values in high-speed interrupt endpoint | |
248 | * descriptors. Try to fix those and fall back to a | |
249 | * 32 ms default value otherwise. */ | |
250 | n = fls(d->bInterval*8); | |
251 | if (n == 0) | |
252 | n = 9; /* 32 ms = 2^(9-1) uframes */ | |
615ae11b AS |
253 | j = 16; |
254 | break; | |
255 | default: /* USB_SPEED_FULL or _LOW */ | |
256 | /* For low-speed, 10 ms is the official minimum. | |
257 | * But some "overclocked" devices might want faster | |
258 | * polling so we'll allow it. */ | |
259 | n = 32; | |
260 | break; | |
261 | } | |
262 | } else if (usb_endpoint_xfer_isoc(d)) { | |
263 | i = 1; | |
264 | j = 16; | |
265 | switch (to_usb_device(ddev)->speed) { | |
266 | case USB_SPEED_HIGH: | |
267 | n = 9; /* 32 ms = 2^(9-1) uframes */ | |
268 | break; | |
269 | default: /* USB_SPEED_FULL */ | |
270 | n = 6; /* 32 ms = 2^(6-1) frames */ | |
271 | break; | |
272 | } | |
273 | } | |
274 | if (d->bInterval < i || d->bInterval > j) { | |
275 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
276 | "endpoint 0x%X has an invalid bInterval %d, " | |
277 | "changing to %d\n", | |
278 | cfgno, inum, asnum, | |
279 | d->bEndpointAddress, d->bInterval, n); | |
280 | endpoint->desc.bInterval = n; | |
281 | } | |
282 | ||
60aac1ec AS |
283 | /* Some buggy low-speed devices have Bulk endpoints, which is |
284 | * explicitly forbidden by the USB spec. In an attempt to make | |
285 | * them usable, we will try treating them as Interrupt endpoints. | |
286 | */ | |
287 | if (to_usb_device(ddev)->speed == USB_SPEED_LOW && | |
288 | usb_endpoint_xfer_bulk(d)) { | |
289 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
290 | "endpoint 0x%X is Bulk; changing to Interrupt\n", | |
291 | cfgno, inum, asnum, d->bEndpointAddress); | |
292 | endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT; | |
293 | endpoint->desc.bInterval = 1; | |
294 | if (le16_to_cpu(endpoint->desc.wMaxPacketSize) > 8) | |
295 | endpoint->desc.wMaxPacketSize = cpu_to_le16(8); | |
296 | } | |
297 | ||
caa9ef67 DB |
298 | /* |
299 | * Some buggy high speed devices have bulk endpoints using | |
300 | * maxpacket sizes other than 512. High speed HCDs may not | |
301 | * be able to handle that particular bug, so let's warn... | |
302 | */ | |
303 | if (to_usb_device(ddev)->speed == USB_SPEED_HIGH | |
304 | && usb_endpoint_xfer_bulk(d)) { | |
305 | unsigned maxp; | |
306 | ||
307 | maxp = le16_to_cpu(endpoint->desc.wMaxPacketSize) & 0x07ff; | |
308 | if (maxp != 512) | |
309 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
310 | "bulk endpoint 0x%X has invalid maxpacket %d\n", | |
311 | cfgno, inum, asnum, d->bEndpointAddress, | |
312 | maxp); | |
313 | } | |
f0058c62 | 314 | /* Allocate room for and parse any SS endpoint companion descriptors */ |
663c30d0 SS |
315 | if (to_usb_device(ddev)->speed == USB_SPEED_SUPER) { |
316 | endpoint->extra = buffer; | |
317 | i = find_next_descriptor_more(buffer, size, USB_DT_SS_ENDPOINT_COMP, | |
318 | USB_DT_ENDPOINT, USB_DT_INTERFACE, &n); | |
319 | endpoint->extralen = i; | |
320 | buffer += i; | |
321 | size -= i; | |
322 | ||
323 | if (size > 0) { | |
f0058c62 SS |
324 | retval = usb_parse_ss_endpoint_companion(ddev, cfgno, |
325 | inum, asnum, endpoint, num_ep, buffer, | |
326 | size); | |
663c30d0 SS |
327 | if (retval >= 0) { |
328 | buffer += retval; | |
329 | retval = buffer - buffer0; | |
330 | } | |
331 | } else { | |
332 | retval = buffer - buffer0; | |
333 | } | |
334 | } else { | |
335 | /* Skip over any Class Specific or Vendor Specific descriptors; | |
336 | * find the next endpoint or interface descriptor */ | |
337 | endpoint->extra = buffer; | |
338 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
339 | USB_DT_INTERFACE, &n); | |
340 | endpoint->extralen = i; | |
341 | retval = buffer - buffer0 + i; | |
342 | } | |
1da177e4 LT |
343 | if (n > 0) |
344 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
345 | n, plural(n), "endpoint"); | |
663c30d0 | 346 | return retval; |
1da177e4 LT |
347 | |
348 | skip_to_next_endpoint_or_interface_descriptor: | |
349 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
350 | USB_DT_INTERFACE, NULL); | |
351 | return buffer - buffer0 + i; | |
352 | } | |
353 | ||
354 | void usb_release_interface_cache(struct kref *ref) | |
355 | { | |
356 | struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref); | |
357 | int j; | |
358 | ||
4f62efe6 AS |
359 | for (j = 0; j < intfc->num_altsetting; j++) { |
360 | struct usb_host_interface *alt = &intfc->altsetting[j]; | |
361 | ||
362 | kfree(alt->endpoint); | |
363 | kfree(alt->string); | |
364 | } | |
1da177e4 LT |
365 | kfree(intfc); |
366 | } | |
367 | ||
368 | static int usb_parse_interface(struct device *ddev, int cfgno, | |
369 | struct usb_host_config *config, unsigned char *buffer, int size, | |
370 | u8 inums[], u8 nalts[]) | |
371 | { | |
372 | unsigned char *buffer0 = buffer; | |
373 | struct usb_interface_descriptor *d; | |
374 | int inum, asnum; | |
375 | struct usb_interface_cache *intfc; | |
376 | struct usb_host_interface *alt; | |
377 | int i, n; | |
378 | int len, retval; | |
379 | int num_ep, num_ep_orig; | |
380 | ||
381 | d = (struct usb_interface_descriptor *) buffer; | |
382 | buffer += d->bLength; | |
383 | size -= d->bLength; | |
384 | ||
385 | if (d->bLength < USB_DT_INTERFACE_SIZE) | |
386 | goto skip_to_next_interface_descriptor; | |
387 | ||
388 | /* Which interface entry is this? */ | |
389 | intfc = NULL; | |
390 | inum = d->bInterfaceNumber; | |
391 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
392 | if (inums[i] == inum) { | |
393 | intfc = config->intf_cache[i]; | |
394 | break; | |
395 | } | |
396 | } | |
397 | if (!intfc || intfc->num_altsetting >= nalts[i]) | |
398 | goto skip_to_next_interface_descriptor; | |
399 | ||
400 | /* Check for duplicate altsetting entries */ | |
401 | asnum = d->bAlternateSetting; | |
402 | for ((i = 0, alt = &intfc->altsetting[0]); | |
403 | i < intfc->num_altsetting; | |
404 | (++i, ++alt)) { | |
405 | if (alt->desc.bAlternateSetting == asnum) { | |
406 | dev_warn(ddev, "Duplicate descriptor for config %d " | |
407 | "interface %d altsetting %d, skipping\n", | |
408 | cfgno, inum, asnum); | |
409 | goto skip_to_next_interface_descriptor; | |
410 | } | |
411 | } | |
412 | ||
413 | ++intfc->num_altsetting; | |
414 | memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE); | |
415 | ||
416 | /* Skip over any Class Specific or Vendor Specific descriptors; | |
417 | * find the first endpoint or interface descriptor */ | |
418 | alt->extra = buffer; | |
419 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
420 | USB_DT_INTERFACE, &n); | |
421 | alt->extralen = i; | |
422 | if (n > 0) | |
423 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
424 | n, plural(n), "interface"); | |
425 | buffer += i; | |
426 | size -= i; | |
427 | ||
428 | /* Allocate space for the right(?) number of endpoints */ | |
429 | num_ep = num_ep_orig = alt->desc.bNumEndpoints; | |
2c044a48 | 430 | alt->desc.bNumEndpoints = 0; /* Use as a counter */ |
1da177e4 LT |
431 | if (num_ep > USB_MAXENDPOINTS) { |
432 | dev_warn(ddev, "too many endpoints for config %d interface %d " | |
433 | "altsetting %d: %d, using maximum allowed: %d\n", | |
434 | cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS); | |
435 | num_ep = USB_MAXENDPOINTS; | |
436 | } | |
437 | ||
2c044a48 GKH |
438 | if (num_ep > 0) { |
439 | /* Can't allocate 0 bytes */ | |
57a21c1b AS |
440 | len = sizeof(struct usb_host_endpoint) * num_ep; |
441 | alt->endpoint = kzalloc(len, GFP_KERNEL); | |
442 | if (!alt->endpoint) | |
443 | return -ENOMEM; | |
444 | } | |
1da177e4 LT |
445 | |
446 | /* Parse all the endpoint descriptors */ | |
447 | n = 0; | |
448 | while (size > 0) { | |
449 | if (((struct usb_descriptor_header *) buffer)->bDescriptorType | |
450 | == USB_DT_INTERFACE) | |
451 | break; | |
452 | retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt, | |
453 | num_ep, buffer, size); | |
454 | if (retval < 0) | |
455 | return retval; | |
456 | ++n; | |
457 | ||
458 | buffer += retval; | |
459 | size -= retval; | |
460 | } | |
461 | ||
462 | if (n != num_ep_orig) | |
463 | dev_warn(ddev, "config %d interface %d altsetting %d has %d " | |
464 | "endpoint descriptor%s, different from the interface " | |
465 | "descriptor's value: %d\n", | |
466 | cfgno, inum, asnum, n, plural(n), num_ep_orig); | |
467 | return buffer - buffer0; | |
468 | ||
469 | skip_to_next_interface_descriptor: | |
470 | i = find_next_descriptor(buffer, size, USB_DT_INTERFACE, | |
471 | USB_DT_INTERFACE, NULL); | |
472 | return buffer - buffer0 + i; | |
473 | } | |
474 | ||
475 | static int usb_parse_configuration(struct device *ddev, int cfgidx, | |
476 | struct usb_host_config *config, unsigned char *buffer, int size) | |
477 | { | |
478 | unsigned char *buffer0 = buffer; | |
479 | int cfgno; | |
480 | int nintf, nintf_orig; | |
481 | int i, j, n; | |
482 | struct usb_interface_cache *intfc; | |
483 | unsigned char *buffer2; | |
484 | int size2; | |
485 | struct usb_descriptor_header *header; | |
486 | int len, retval; | |
487 | u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES]; | |
165fe97e | 488 | unsigned iad_num = 0; |
1da177e4 LT |
489 | |
490 | memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE); | |
491 | if (config->desc.bDescriptorType != USB_DT_CONFIG || | |
492 | config->desc.bLength < USB_DT_CONFIG_SIZE) { | |
493 | dev_err(ddev, "invalid descriptor for config index %d: " | |
494 | "type = 0x%X, length = %d\n", cfgidx, | |
495 | config->desc.bDescriptorType, config->desc.bLength); | |
496 | return -EINVAL; | |
497 | } | |
498 | cfgno = config->desc.bConfigurationValue; | |
499 | ||
500 | buffer += config->desc.bLength; | |
501 | size -= config->desc.bLength; | |
502 | ||
503 | nintf = nintf_orig = config->desc.bNumInterfaces; | |
504 | if (nintf > USB_MAXINTERFACES) { | |
505 | dev_warn(ddev, "config %d has too many interfaces: %d, " | |
506 | "using maximum allowed: %d\n", | |
507 | cfgno, nintf, USB_MAXINTERFACES); | |
508 | nintf = USB_MAXINTERFACES; | |
509 | } | |
510 | ||
511 | /* Go through the descriptors, checking their length and counting the | |
512 | * number of altsettings for each interface */ | |
513 | n = 0; | |
514 | for ((buffer2 = buffer, size2 = size); | |
515 | size2 > 0; | |
516 | (buffer2 += header->bLength, size2 -= header->bLength)) { | |
517 | ||
518 | if (size2 < sizeof(struct usb_descriptor_header)) { | |
519 | dev_warn(ddev, "config %d descriptor has %d excess " | |
520 | "byte%s, ignoring\n", | |
521 | cfgno, size2, plural(size2)); | |
522 | break; | |
523 | } | |
524 | ||
525 | header = (struct usb_descriptor_header *) buffer2; | |
526 | if ((header->bLength > size2) || (header->bLength < 2)) { | |
527 | dev_warn(ddev, "config %d has an invalid descriptor " | |
528 | "of length %d, skipping remainder of the config\n", | |
529 | cfgno, header->bLength); | |
530 | break; | |
531 | } | |
532 | ||
533 | if (header->bDescriptorType == USB_DT_INTERFACE) { | |
534 | struct usb_interface_descriptor *d; | |
535 | int inum; | |
536 | ||
537 | d = (struct usb_interface_descriptor *) header; | |
538 | if (d->bLength < USB_DT_INTERFACE_SIZE) { | |
539 | dev_warn(ddev, "config %d has an invalid " | |
540 | "interface descriptor of length %d, " | |
541 | "skipping\n", cfgno, d->bLength); | |
542 | continue; | |
543 | } | |
544 | ||
545 | inum = d->bInterfaceNumber; | |
546 | if (inum >= nintf_orig) | |
547 | dev_warn(ddev, "config %d has an invalid " | |
548 | "interface number: %d but max is %d\n", | |
549 | cfgno, inum, nintf_orig - 1); | |
550 | ||
551 | /* Have we already encountered this interface? | |
552 | * Count its altsettings */ | |
553 | for (i = 0; i < n; ++i) { | |
554 | if (inums[i] == inum) | |
555 | break; | |
556 | } | |
557 | if (i < n) { | |
558 | if (nalts[i] < 255) | |
559 | ++nalts[i]; | |
560 | } else if (n < USB_MAXINTERFACES) { | |
561 | inums[n] = inum; | |
562 | nalts[n] = 1; | |
563 | ++n; | |
564 | } | |
565 | ||
165fe97e CN |
566 | } else if (header->bDescriptorType == |
567 | USB_DT_INTERFACE_ASSOCIATION) { | |
568 | if (iad_num == USB_MAXIADS) { | |
569 | dev_warn(ddev, "found more Interface " | |
570 | "Association Descriptors " | |
571 | "than allocated for in " | |
572 | "configuration %d\n", cfgno); | |
573 | } else { | |
574 | config->intf_assoc[iad_num] = | |
575 | (struct usb_interface_assoc_descriptor | |
576 | *)header; | |
577 | iad_num++; | |
578 | } | |
579 | ||
1da177e4 LT |
580 | } else if (header->bDescriptorType == USB_DT_DEVICE || |
581 | header->bDescriptorType == USB_DT_CONFIG) | |
582 | dev_warn(ddev, "config %d contains an unexpected " | |
583 | "descriptor of type 0x%X, skipping\n", | |
584 | cfgno, header->bDescriptorType); | |
585 | ||
586 | } /* for ((buffer2 = buffer, size2 = size); ...) */ | |
587 | size = buffer2 - buffer; | |
588 | config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0); | |
589 | ||
590 | if (n != nintf) | |
591 | dev_warn(ddev, "config %d has %d interface%s, different from " | |
592 | "the descriptor's value: %d\n", | |
593 | cfgno, n, plural(n), nintf_orig); | |
594 | else if (n == 0) | |
595 | dev_warn(ddev, "config %d has no interfaces?\n", cfgno); | |
596 | config->desc.bNumInterfaces = nintf = n; | |
597 | ||
598 | /* Check for missing interface numbers */ | |
599 | for (i = 0; i < nintf; ++i) { | |
600 | for (j = 0; j < nintf; ++j) { | |
601 | if (inums[j] == i) | |
602 | break; | |
603 | } | |
604 | if (j >= nintf) | |
605 | dev_warn(ddev, "config %d has no interface number " | |
606 | "%d\n", cfgno, i); | |
607 | } | |
608 | ||
609 | /* Allocate the usb_interface_caches and altsetting arrays */ | |
610 | for (i = 0; i < nintf; ++i) { | |
611 | j = nalts[i]; | |
612 | if (j > USB_MAXALTSETTING) { | |
613 | dev_warn(ddev, "too many alternate settings for " | |
614 | "config %d interface %d: %d, " | |
615 | "using maximum allowed: %d\n", | |
616 | cfgno, inums[i], j, USB_MAXALTSETTING); | |
617 | nalts[i] = j = USB_MAXALTSETTING; | |
618 | } | |
619 | ||
620 | len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j; | |
0a1ef3b5 | 621 | config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL); |
1da177e4 LT |
622 | if (!intfc) |
623 | return -ENOMEM; | |
1da177e4 LT |
624 | kref_init(&intfc->ref); |
625 | } | |
626 | ||
663c30d0 SS |
627 | /* FIXME: parse the BOS descriptor */ |
628 | ||
1da177e4 LT |
629 | /* Skip over any Class Specific or Vendor Specific descriptors; |
630 | * find the first interface descriptor */ | |
631 | config->extra = buffer; | |
632 | i = find_next_descriptor(buffer, size, USB_DT_INTERFACE, | |
633 | USB_DT_INTERFACE, &n); | |
634 | config->extralen = i; | |
635 | if (n > 0) | |
636 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
637 | n, plural(n), "configuration"); | |
638 | buffer += i; | |
639 | size -= i; | |
640 | ||
641 | /* Parse all the interface/altsetting descriptors */ | |
642 | while (size > 0) { | |
643 | retval = usb_parse_interface(ddev, cfgno, config, | |
644 | buffer, size, inums, nalts); | |
645 | if (retval < 0) | |
646 | return retval; | |
647 | ||
648 | buffer += retval; | |
649 | size -= retval; | |
650 | } | |
651 | ||
652 | /* Check for missing altsettings */ | |
653 | for (i = 0; i < nintf; ++i) { | |
654 | intfc = config->intf_cache[i]; | |
655 | for (j = 0; j < intfc->num_altsetting; ++j) { | |
656 | for (n = 0; n < intfc->num_altsetting; ++n) { | |
657 | if (intfc->altsetting[n].desc. | |
658 | bAlternateSetting == j) | |
659 | break; | |
660 | } | |
661 | if (n >= intfc->num_altsetting) | |
662 | dev_warn(ddev, "config %d interface %d has no " | |
663 | "altsetting %d\n", cfgno, inums[i], j); | |
664 | } | |
665 | } | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
2c044a48 GKH |
670 | /* hub-only!! ... and only exported for reset/reinit path. |
671 | * otherwise used internally on disconnect/destroy path | |
672 | */ | |
1da177e4 LT |
673 | void usb_destroy_configuration(struct usb_device *dev) |
674 | { | |
675 | int c, i; | |
676 | ||
677 | if (!dev->config) | |
678 | return; | |
679 | ||
680 | if (dev->rawdescriptors) { | |
681 | for (i = 0; i < dev->descriptor.bNumConfigurations; i++) | |
682 | kfree(dev->rawdescriptors[i]); | |
683 | ||
684 | kfree(dev->rawdescriptors); | |
685 | dev->rawdescriptors = NULL; | |
686 | } | |
687 | ||
688 | for (c = 0; c < dev->descriptor.bNumConfigurations; c++) { | |
689 | struct usb_host_config *cf = &dev->config[c]; | |
690 | ||
691 | kfree(cf->string); | |
1da177e4 LT |
692 | for (i = 0; i < cf->desc.bNumInterfaces; i++) { |
693 | if (cf->intf_cache[i]) | |
2c044a48 | 694 | kref_put(&cf->intf_cache[i]->ref, |
1da177e4 LT |
695 | usb_release_interface_cache); |
696 | } | |
697 | } | |
698 | kfree(dev->config); | |
699 | dev->config = NULL; | |
700 | } | |
701 | ||
702 | ||
1145065c IPG |
703 | /* |
704 | * Get the USB config descriptors, cache and parse'em | |
705 | * | |
706 | * hub-only!! ... and only in reset path, or usb_new_device() | |
707 | * (used by real hubs and virtual root hubs) | |
708 | * | |
709 | * NOTE: if this is a WUSB device and is not authorized, we skip the | |
710 | * whole thing. A non-authorized USB device has no | |
711 | * configurations. | |
712 | */ | |
1da177e4 LT |
713 | int usb_get_configuration(struct usb_device *dev) |
714 | { | |
715 | struct device *ddev = &dev->dev; | |
716 | int ncfg = dev->descriptor.bNumConfigurations; | |
1145065c | 717 | int result = 0; |
1da177e4 LT |
718 | unsigned int cfgno, length; |
719 | unsigned char *buffer; | |
720 | unsigned char *bigbuffer; | |
2c044a48 | 721 | struct usb_config_descriptor *desc; |
1da177e4 | 722 | |
1145065c IPG |
723 | cfgno = 0; |
724 | if (dev->authorized == 0) /* Not really an error */ | |
725 | goto out_not_authorized; | |
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 LT |
747 | |
748 | buffer = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL); | |
749 | if (!buffer) | |
750 | goto err2; | |
751 | desc = (struct usb_config_descriptor *)buffer; | |
752 | ||
1145065c IPG |
753 | result = 0; |
754 | for (; cfgno < ncfg; cfgno++) { | |
1da177e4 LT |
755 | /* We grab just the first descriptor so we know how long |
756 | * the whole configuration is */ | |
757 | result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, | |
758 | buffer, USB_DT_CONFIG_SIZE); | |
759 | if (result < 0) { | |
760 | dev_err(ddev, "unable to read config index %d " | |
1145065c | 761 | "descriptor/%s: %d\n", cfgno, "start", result); |
cb4c8fe5 IPG |
762 | dev_err(ddev, "chopping to %d config(s)\n", cfgno); |
763 | dev->descriptor.bNumConfigurations = cfgno; | |
764 | break; | |
1da177e4 LT |
765 | } else if (result < 4) { |
766 | dev_err(ddev, "config index %d descriptor too short " | |
767 | "(expected %i, got %i)\n", cfgno, | |
768 | USB_DT_CONFIG_SIZE, result); | |
769 | result = -EINVAL; | |
770 | goto err; | |
771 | } | |
772 | length = max((int) le16_to_cpu(desc->wTotalLength), | |
773 | USB_DT_CONFIG_SIZE); | |
774 | ||
775 | /* Now that we know the length, get the whole thing */ | |
776 | bigbuffer = kmalloc(length, GFP_KERNEL); | |
777 | if (!bigbuffer) { | |
778 | result = -ENOMEM; | |
779 | goto err; | |
780 | } | |
781 | result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, | |
782 | bigbuffer, length); | |
783 | if (result < 0) { | |
784 | dev_err(ddev, "unable to read config index %d " | |
785 | "descriptor/%s\n", cfgno, "all"); | |
786 | kfree(bigbuffer); | |
787 | goto err; | |
788 | } | |
789 | if (result < length) { | |
790 | dev_warn(ddev, "config index %d descriptor too short " | |
791 | "(expected %i, got %i)\n", cfgno, length, result); | |
792 | length = result; | |
793 | } | |
794 | ||
795 | dev->rawdescriptors[cfgno] = bigbuffer; | |
796 | ||
797 | result = usb_parse_configuration(&dev->dev, cfgno, | |
798 | &dev->config[cfgno], bigbuffer, length); | |
799 | if (result < 0) { | |
800 | ++cfgno; | |
801 | goto err; | |
802 | } | |
803 | } | |
804 | result = 0; | |
805 | ||
806 | err: | |
807 | kfree(buffer); | |
1145065c | 808 | out_not_authorized: |
1da177e4 LT |
809 | dev->descriptor.bNumConfigurations = cfgno; |
810 | err2: | |
811 | if (result == -ENOMEM) | |
812 | dev_err(ddev, "out of memory\n"); | |
813 | return result; | |
814 | } |