Commit | Line | Data |
---|---|---|
1da177e4 | 1 | #include <linux/usb.h> |
615ae11b | 2 | #include <linux/usb/ch9.h> |
27729aad | 3 | #include <linux/usb/hcd.h> |
1da177e4 LT |
4 | #include <linux/module.h> |
5 | #include <linux/init.h> | |
6 | #include <linux/slab.h> | |
7 | #include <linux/device.h> | |
8 | #include <asm/byteorder.h> | |
6d5e8254 | 9 | #include "usb.h" |
27729aad | 10 | |
1da177e4 LT |
11 | |
12 | #define USB_MAXALTSETTING 128 /* Hard limit */ | |
13 | #define USB_MAXENDPOINTS 30 /* Hard limit */ | |
14 | ||
15 | #define USB_MAXCONFIG 8 /* Arbitrary limit */ | |
16 | ||
17 | ||
18 | static inline const char *plural(int n) | |
19 | { | |
20 | return (n == 1 ? "" : "s"); | |
21 | } | |
22 | ||
663c30d0 SS |
23 | /* FIXME: this is a kludge */ |
24 | static int find_next_descriptor_more(unsigned char *buffer, int size, | |
25 | int dt1, int dt2, int dt3, 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 or dt3 */ | |
32 | while (size > 0) { | |
33 | h = (struct usb_descriptor_header *) buffer; | |
34 | if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2 || | |
35 | h->bDescriptorType == dt3) | |
36 | break; | |
37 | buffer += h->bLength; | |
38 | size -= h->bLength; | |
39 | ++n; | |
40 | } | |
41 | ||
42 | /* Store the number of descriptors skipped and return the | |
43 | * number of bytes skipped */ | |
44 | if (num_skipped) | |
45 | *num_skipped = n; | |
46 | return buffer - buffer0; | |
47 | } | |
48 | ||
1da177e4 LT |
49 | static int find_next_descriptor(unsigned char *buffer, int size, |
50 | int dt1, int dt2, int *num_skipped) | |
51 | { | |
52 | struct usb_descriptor_header *h; | |
53 | int n = 0; | |
54 | unsigned char *buffer0 = buffer; | |
55 | ||
56 | /* Find the next descriptor of type dt1 or dt2 */ | |
57 | while (size > 0) { | |
58 | h = (struct usb_descriptor_header *) buffer; | |
59 | if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2) | |
60 | break; | |
61 | buffer += h->bLength; | |
62 | size -= h->bLength; | |
63 | ++n; | |
64 | } | |
65 | ||
66 | /* Store the number of descriptors skipped and return the | |
67 | * number of bytes skipped */ | |
68 | if (num_skipped) | |
69 | *num_skipped = n; | |
70 | return buffer - buffer0; | |
71 | } | |
72 | ||
f0058c62 | 73 | static int usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno, |
663c30d0 SS |
74 | int inum, int asnum, struct usb_host_endpoint *ep, |
75 | int num_ep, unsigned char *buffer, int size) | |
76 | { | |
77 | unsigned char *buffer_start = buffer; | |
f0058c62 | 78 | struct usb_ss_ep_comp_descriptor *desc; |
663c30d0 SS |
79 | int retval; |
80 | int num_skipped; | |
81 | int max_tx; | |
82 | int i; | |
83 | ||
f0058c62 | 84 | desc = (struct usb_ss_ep_comp_descriptor *) buffer; |
663c30d0 SS |
85 | if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP) { |
86 | dev_warn(ddev, "No SuperSpeed endpoint companion for config %d " | |
87 | " interface %d altsetting %d ep %d: " | |
88 | "using minimum values\n", | |
89 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
663c30d0 SS |
90 | /* |
91 | * The next descriptor is for an Endpoint or Interface, | |
92 | * no extra descriptors to copy into the companion structure, | |
93 | * and we didn't eat up any of the buffer. | |
94 | */ | |
9f8e4438 | 95 | return 0; |
663c30d0 | 96 | } |
f0058c62 SS |
97 | memcpy(&ep->ss_ep_comp->desc, desc, USB_DT_SS_EP_COMP_SIZE); |
98 | desc = &ep->ss_ep_comp->desc; | |
663c30d0 SS |
99 | buffer += desc->bLength; |
100 | size -= desc->bLength; | |
101 | ||
102 | /* Eat up the other descriptors we don't care about */ | |
f0058c62 | 103 | ep->ss_ep_comp->extra = buffer; |
663c30d0 SS |
104 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, |
105 | USB_DT_INTERFACE, &num_skipped); | |
f0058c62 | 106 | ep->ss_ep_comp->extralen = i; |
663c30d0 SS |
107 | buffer += i; |
108 | size -= i; | |
6682bb39 | 109 | retval = buffer - buffer_start; |
663c30d0 SS |
110 | if (num_skipped > 0) |
111 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
112 | num_skipped, plural(num_skipped), | |
113 | "SuperSpeed endpoint companion"); | |
114 | ||
115 | /* Check the various values */ | |
116 | if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) { | |
117 | dev_warn(ddev, "Control endpoint with bMaxBurst = %d in " | |
118 | "config %d interface %d altsetting %d ep %d: " | |
119 | "setting to zero\n", desc->bMaxBurst, | |
120 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
121 | desc->bMaxBurst = 0; | |
122 | } | |
123 | if (desc->bMaxBurst > 15) { | |
124 | dev_warn(ddev, "Endpoint with bMaxBurst = %d in " | |
125 | "config %d interface %d altsetting %d ep %d: " | |
126 | "setting to 15\n", desc->bMaxBurst, | |
127 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
128 | desc->bMaxBurst = 15; | |
129 | } | |
130 | if ((usb_endpoint_xfer_control(&ep->desc) || usb_endpoint_xfer_int(&ep->desc)) | |
131 | && desc->bmAttributes != 0) { | |
132 | dev_warn(ddev, "%s endpoint with bmAttributes = %d in " | |
133 | "config %d interface %d altsetting %d ep %d: " | |
134 | "setting to zero\n", | |
135 | usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk", | |
136 | desc->bmAttributes, | |
137 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
138 | desc->bmAttributes = 0; | |
139 | } | |
140 | if (usb_endpoint_xfer_bulk(&ep->desc) && desc->bmAttributes > 16) { | |
141 | dev_warn(ddev, "Bulk endpoint with more than 65536 streams in " | |
142 | "config %d interface %d altsetting %d ep %d: " | |
143 | "setting to max\n", | |
144 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
145 | desc->bmAttributes = 16; | |
146 | } | |
147 | if (usb_endpoint_xfer_isoc(&ep->desc) && desc->bmAttributes > 2) { | |
148 | dev_warn(ddev, "Isoc endpoint has Mult of %d in " | |
149 | "config %d interface %d altsetting %d ep %d: " | |
150 | "setting to 3\n", desc->bmAttributes + 1, | |
151 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
152 | desc->bmAttributes = 2; | |
153 | } | |
154 | if (usb_endpoint_xfer_isoc(&ep->desc)) { | |
155 | max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1) * | |
156 | (desc->bmAttributes + 1); | |
157 | } else if (usb_endpoint_xfer_int(&ep->desc)) { | |
158 | max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1); | |
159 | } else { | |
160 | goto valid; | |
161 | } | |
162 | if (desc->wBytesPerInterval > max_tx) { | |
163 | dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in " | |
164 | "config %d interface %d altsetting %d ep %d: " | |
165 | "setting to %d\n", | |
166 | usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int", | |
167 | desc->wBytesPerInterval, | |
168 | cfgno, inum, asnum, ep->desc.bEndpointAddress, | |
169 | max_tx); | |
170 | desc->wBytesPerInterval = max_tx; | |
171 | } | |
172 | valid: | |
173 | return retval; | |
174 | } | |
175 | ||
1da177e4 LT |
176 | static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, |
177 | int asnum, struct usb_host_interface *ifp, int num_ep, | |
178 | unsigned char *buffer, int size) | |
179 | { | |
180 | unsigned char *buffer0 = buffer; | |
181 | struct usb_endpoint_descriptor *d; | |
182 | struct usb_host_endpoint *endpoint; | |
663c30d0 | 183 | int n, i, j, retval; |
1da177e4 LT |
184 | |
185 | d = (struct usb_endpoint_descriptor *) buffer; | |
186 | buffer += d->bLength; | |
187 | size -= d->bLength; | |
188 | ||
189 | if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE) | |
190 | n = USB_DT_ENDPOINT_AUDIO_SIZE; | |
191 | else if (d->bLength >= USB_DT_ENDPOINT_SIZE) | |
192 | n = USB_DT_ENDPOINT_SIZE; | |
193 | else { | |
194 | dev_warn(ddev, "config %d interface %d altsetting %d has an " | |
195 | "invalid endpoint descriptor of length %d, skipping\n", | |
196 | cfgno, inum, asnum, d->bLength); | |
197 | goto skip_to_next_endpoint_or_interface_descriptor; | |
198 | } | |
199 | ||
200 | i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK; | |
201 | if (i >= 16 || i == 0) { | |
202 | dev_warn(ddev, "config %d interface %d altsetting %d has an " | |
203 | "invalid endpoint with address 0x%X, skipping\n", | |
204 | cfgno, inum, asnum, d->bEndpointAddress); | |
205 | goto skip_to_next_endpoint_or_interface_descriptor; | |
206 | } | |
207 | ||
208 | /* Only store as many endpoints as we have room for */ | |
209 | if (ifp->desc.bNumEndpoints >= num_ep) | |
210 | goto skip_to_next_endpoint_or_interface_descriptor; | |
211 | ||
212 | endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints]; | |
213 | ++ifp->desc.bNumEndpoints; | |
214 | ||
215 | memcpy(&endpoint->desc, d, n); | |
216 | INIT_LIST_HEAD(&endpoint->urb_list); | |
217 | ||
300871cd LP |
218 | /* Fix up bInterval values outside the legal range. Use 32 ms if no |
219 | * proper value can be guessed. */ | |
615ae11b AS |
220 | i = 0; /* i = min, j = max, n = default */ |
221 | j = 255; | |
222 | if (usb_endpoint_xfer_int(d)) { | |
223 | i = 1; | |
224 | switch (to_usb_device(ddev)->speed) { | |
6b403b02 | 225 | case USB_SPEED_SUPER: |
615ae11b | 226 | case USB_SPEED_HIGH: |
300871cd LP |
227 | /* Many device manufacturers are using full-speed |
228 | * bInterval values in high-speed interrupt endpoint | |
229 | * descriptors. Try to fix those and fall back to a | |
230 | * 32 ms default value otherwise. */ | |
231 | n = fls(d->bInterval*8); | |
232 | if (n == 0) | |
233 | n = 9; /* 32 ms = 2^(9-1) uframes */ | |
615ae11b AS |
234 | j = 16; |
235 | break; | |
236 | default: /* USB_SPEED_FULL or _LOW */ | |
237 | /* For low-speed, 10 ms is the official minimum. | |
238 | * But some "overclocked" devices might want faster | |
239 | * polling so we'll allow it. */ | |
240 | n = 32; | |
241 | break; | |
242 | } | |
243 | } else if (usb_endpoint_xfer_isoc(d)) { | |
244 | i = 1; | |
245 | j = 16; | |
246 | switch (to_usb_device(ddev)->speed) { | |
247 | case USB_SPEED_HIGH: | |
248 | n = 9; /* 32 ms = 2^(9-1) uframes */ | |
249 | break; | |
250 | default: /* USB_SPEED_FULL */ | |
251 | n = 6; /* 32 ms = 2^(6-1) frames */ | |
252 | break; | |
253 | } | |
254 | } | |
255 | if (d->bInterval < i || d->bInterval > j) { | |
256 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
257 | "endpoint 0x%X has an invalid bInterval %d, " | |
258 | "changing to %d\n", | |
259 | cfgno, inum, asnum, | |
260 | d->bEndpointAddress, d->bInterval, n); | |
261 | endpoint->desc.bInterval = n; | |
262 | } | |
263 | ||
60aac1ec AS |
264 | /* Some buggy low-speed devices have Bulk endpoints, which is |
265 | * explicitly forbidden by the USB spec. In an attempt to make | |
266 | * them usable, we will try treating them as Interrupt endpoints. | |
267 | */ | |
268 | if (to_usb_device(ddev)->speed == USB_SPEED_LOW && | |
269 | usb_endpoint_xfer_bulk(d)) { | |
270 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
271 | "endpoint 0x%X is Bulk; changing to Interrupt\n", | |
272 | cfgno, inum, asnum, d->bEndpointAddress); | |
273 | endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT; | |
274 | endpoint->desc.bInterval = 1; | |
275 | if (le16_to_cpu(endpoint->desc.wMaxPacketSize) > 8) | |
276 | endpoint->desc.wMaxPacketSize = cpu_to_le16(8); | |
277 | } | |
278 | ||
caa9ef67 DB |
279 | /* |
280 | * Some buggy high speed devices have bulk endpoints using | |
281 | * maxpacket sizes other than 512. High speed HCDs may not | |
282 | * be able to handle that particular bug, so let's warn... | |
283 | */ | |
284 | if (to_usb_device(ddev)->speed == USB_SPEED_HIGH | |
285 | && usb_endpoint_xfer_bulk(d)) { | |
286 | unsigned maxp; | |
287 | ||
288 | maxp = le16_to_cpu(endpoint->desc.wMaxPacketSize) & 0x07ff; | |
289 | if (maxp != 512) | |
290 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
291 | "bulk endpoint 0x%X has invalid maxpacket %d\n", | |
292 | cfgno, inum, asnum, d->bEndpointAddress, | |
293 | maxp); | |
294 | } | |
f0058c62 | 295 | /* Allocate room for and parse any SS endpoint companion descriptors */ |
663c30d0 SS |
296 | if (to_usb_device(ddev)->speed == USB_SPEED_SUPER) { |
297 | endpoint->extra = buffer; | |
298 | i = find_next_descriptor_more(buffer, size, USB_DT_SS_ENDPOINT_COMP, | |
299 | USB_DT_ENDPOINT, USB_DT_INTERFACE, &n); | |
300 | endpoint->extralen = i; | |
301 | buffer += i; | |
302 | size -= i; | |
303 | ||
9f8e4438 SS |
304 | /* Allocate space for the SS endpoint companion descriptor */ |
305 | endpoint->ss_ep_comp = kzalloc(sizeof(struct usb_host_ss_ep_comp), | |
306 | GFP_KERNEL); | |
307 | if (!endpoint->ss_ep_comp) | |
308 | return -ENOMEM; | |
309 | ||
310 | /* Fill in some default values (may be overwritten later) */ | |
311 | endpoint->ss_ep_comp->desc.bLength = USB_DT_SS_EP_COMP_SIZE; | |
312 | endpoint->ss_ep_comp->desc.bDescriptorType = USB_DT_SS_ENDPOINT_COMP; | |
313 | endpoint->ss_ep_comp->desc.bMaxBurst = 0; | |
314 | /* | |
315 | * Leave bmAttributes as zero, which will mean no streams for | |
316 | * bulk, and isoc won't support multiple bursts of packets. | |
317 | * With bursts of only one packet, and a Mult of 1, the max | |
318 | * amount of data moved per endpoint service interval is one | |
319 | * packet. | |
320 | */ | |
321 | if (usb_endpoint_xfer_isoc(&endpoint->desc) || | |
322 | usb_endpoint_xfer_int(&endpoint->desc)) | |
323 | endpoint->ss_ep_comp->desc.wBytesPerInterval = | |
324 | endpoint->desc.wMaxPacketSize; | |
325 | ||
663c30d0 | 326 | if (size > 0) { |
f0058c62 SS |
327 | retval = usb_parse_ss_endpoint_companion(ddev, cfgno, |
328 | inum, asnum, endpoint, num_ep, buffer, | |
329 | size); | |
663c30d0 SS |
330 | if (retval >= 0) { |
331 | buffer += retval; | |
332 | retval = buffer - buffer0; | |
333 | } | |
334 | } else { | |
9f8e4438 SS |
335 | dev_warn(ddev, "config %d interface %d altsetting %d " |
336 | "endpoint 0x%X has no " | |
337 | "SuperSpeed companion descriptor\n", | |
338 | cfgno, inum, asnum, d->bEndpointAddress); | |
663c30d0 SS |
339 | retval = buffer - buffer0; |
340 | } | |
341 | } else { | |
342 | /* Skip over any Class Specific or Vendor Specific descriptors; | |
343 | * find the next endpoint or interface descriptor */ | |
344 | endpoint->extra = buffer; | |
345 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
346 | USB_DT_INTERFACE, &n); | |
347 | endpoint->extralen = i; | |
348 | retval = buffer - buffer0 + i; | |
349 | } | |
1da177e4 LT |
350 | if (n > 0) |
351 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
352 | n, plural(n), "endpoint"); | |
663c30d0 | 353 | return retval; |
1da177e4 LT |
354 | |
355 | skip_to_next_endpoint_or_interface_descriptor: | |
356 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
357 | USB_DT_INTERFACE, NULL); | |
358 | return buffer - buffer0 + i; | |
359 | } | |
360 | ||
361 | void usb_release_interface_cache(struct kref *ref) | |
362 | { | |
363 | struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref); | |
364 | int j; | |
365 | ||
4f62efe6 AS |
366 | for (j = 0; j < intfc->num_altsetting; j++) { |
367 | struct usb_host_interface *alt = &intfc->altsetting[j]; | |
368 | ||
369 | kfree(alt->endpoint); | |
370 | kfree(alt->string); | |
371 | } | |
1da177e4 LT |
372 | kfree(intfc); |
373 | } | |
374 | ||
375 | static int usb_parse_interface(struct device *ddev, int cfgno, | |
376 | struct usb_host_config *config, unsigned char *buffer, int size, | |
377 | u8 inums[], u8 nalts[]) | |
378 | { | |
379 | unsigned char *buffer0 = buffer; | |
380 | struct usb_interface_descriptor *d; | |
381 | int inum, asnum; | |
382 | struct usb_interface_cache *intfc; | |
383 | struct usb_host_interface *alt; | |
384 | int i, n; | |
385 | int len, retval; | |
386 | int num_ep, num_ep_orig; | |
387 | ||
388 | d = (struct usb_interface_descriptor *) buffer; | |
389 | buffer += d->bLength; | |
390 | size -= d->bLength; | |
391 | ||
392 | if (d->bLength < USB_DT_INTERFACE_SIZE) | |
393 | goto skip_to_next_interface_descriptor; | |
394 | ||
395 | /* Which interface entry is this? */ | |
396 | intfc = NULL; | |
397 | inum = d->bInterfaceNumber; | |
398 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
399 | if (inums[i] == inum) { | |
400 | intfc = config->intf_cache[i]; | |
401 | break; | |
402 | } | |
403 | } | |
404 | if (!intfc || intfc->num_altsetting >= nalts[i]) | |
405 | goto skip_to_next_interface_descriptor; | |
406 | ||
407 | /* Check for duplicate altsetting entries */ | |
408 | asnum = d->bAlternateSetting; | |
409 | for ((i = 0, alt = &intfc->altsetting[0]); | |
410 | i < intfc->num_altsetting; | |
411 | (++i, ++alt)) { | |
412 | if (alt->desc.bAlternateSetting == asnum) { | |
413 | dev_warn(ddev, "Duplicate descriptor for config %d " | |
414 | "interface %d altsetting %d, skipping\n", | |
415 | cfgno, inum, asnum); | |
416 | goto skip_to_next_interface_descriptor; | |
417 | } | |
418 | } | |
419 | ||
420 | ++intfc->num_altsetting; | |
421 | memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE); | |
422 | ||
423 | /* Skip over any Class Specific or Vendor Specific descriptors; | |
424 | * find the first endpoint or interface descriptor */ | |
425 | alt->extra = buffer; | |
426 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
427 | USB_DT_INTERFACE, &n); | |
428 | alt->extralen = i; | |
429 | if (n > 0) | |
430 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
431 | n, plural(n), "interface"); | |
432 | buffer += i; | |
433 | size -= i; | |
434 | ||
435 | /* Allocate space for the right(?) number of endpoints */ | |
436 | num_ep = num_ep_orig = alt->desc.bNumEndpoints; | |
2c044a48 | 437 | alt->desc.bNumEndpoints = 0; /* Use as a counter */ |
1da177e4 LT |
438 | if (num_ep > USB_MAXENDPOINTS) { |
439 | dev_warn(ddev, "too many endpoints for config %d interface %d " | |
440 | "altsetting %d: %d, using maximum allowed: %d\n", | |
441 | cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS); | |
442 | num_ep = USB_MAXENDPOINTS; | |
443 | } | |
444 | ||
2c044a48 GKH |
445 | if (num_ep > 0) { |
446 | /* Can't allocate 0 bytes */ | |
57a21c1b AS |
447 | len = sizeof(struct usb_host_endpoint) * num_ep; |
448 | alt->endpoint = kzalloc(len, GFP_KERNEL); | |
449 | if (!alt->endpoint) | |
450 | return -ENOMEM; | |
451 | } | |
1da177e4 LT |
452 | |
453 | /* Parse all the endpoint descriptors */ | |
454 | n = 0; | |
455 | while (size > 0) { | |
456 | if (((struct usb_descriptor_header *) buffer)->bDescriptorType | |
457 | == USB_DT_INTERFACE) | |
458 | break; | |
459 | retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt, | |
460 | num_ep, buffer, size); | |
461 | if (retval < 0) | |
462 | return retval; | |
463 | ++n; | |
464 | ||
465 | buffer += retval; | |
466 | size -= retval; | |
467 | } | |
468 | ||
469 | if (n != num_ep_orig) | |
470 | dev_warn(ddev, "config %d interface %d altsetting %d has %d " | |
471 | "endpoint descriptor%s, different from the interface " | |
472 | "descriptor's value: %d\n", | |
473 | cfgno, inum, asnum, n, plural(n), num_ep_orig); | |
474 | return buffer - buffer0; | |
475 | ||
476 | skip_to_next_interface_descriptor: | |
477 | i = find_next_descriptor(buffer, size, USB_DT_INTERFACE, | |
478 | USB_DT_INTERFACE, NULL); | |
479 | return buffer - buffer0 + i; | |
480 | } | |
481 | ||
482 | static int usb_parse_configuration(struct device *ddev, int cfgidx, | |
483 | struct usb_host_config *config, unsigned char *buffer, int size) | |
484 | { | |
485 | unsigned char *buffer0 = buffer; | |
486 | int cfgno; | |
487 | int nintf, nintf_orig; | |
488 | int i, j, n; | |
489 | struct usb_interface_cache *intfc; | |
490 | unsigned char *buffer2; | |
491 | int size2; | |
492 | struct usb_descriptor_header *header; | |
493 | int len, retval; | |
494 | u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES]; | |
165fe97e | 495 | unsigned iad_num = 0; |
1da177e4 LT |
496 | |
497 | memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE); | |
498 | if (config->desc.bDescriptorType != USB_DT_CONFIG || | |
499 | config->desc.bLength < USB_DT_CONFIG_SIZE) { | |
500 | dev_err(ddev, "invalid descriptor for config index %d: " | |
501 | "type = 0x%X, length = %d\n", cfgidx, | |
502 | config->desc.bDescriptorType, config->desc.bLength); | |
503 | return -EINVAL; | |
504 | } | |
505 | cfgno = config->desc.bConfigurationValue; | |
506 | ||
507 | buffer += config->desc.bLength; | |
508 | size -= config->desc.bLength; | |
509 | ||
510 | nintf = nintf_orig = config->desc.bNumInterfaces; | |
511 | if (nintf > USB_MAXINTERFACES) { | |
512 | dev_warn(ddev, "config %d has too many interfaces: %d, " | |
513 | "using maximum allowed: %d\n", | |
514 | cfgno, nintf, USB_MAXINTERFACES); | |
515 | nintf = USB_MAXINTERFACES; | |
516 | } | |
517 | ||
518 | /* Go through the descriptors, checking their length and counting the | |
519 | * number of altsettings for each interface */ | |
520 | n = 0; | |
521 | for ((buffer2 = buffer, size2 = size); | |
522 | size2 > 0; | |
523 | (buffer2 += header->bLength, size2 -= header->bLength)) { | |
524 | ||
525 | if (size2 < sizeof(struct usb_descriptor_header)) { | |
526 | dev_warn(ddev, "config %d descriptor has %d excess " | |
527 | "byte%s, ignoring\n", | |
528 | cfgno, size2, plural(size2)); | |
529 | break; | |
530 | } | |
531 | ||
532 | header = (struct usb_descriptor_header *) buffer2; | |
533 | if ((header->bLength > size2) || (header->bLength < 2)) { | |
534 | dev_warn(ddev, "config %d has an invalid descriptor " | |
535 | "of length %d, skipping remainder of the config\n", | |
536 | cfgno, header->bLength); | |
537 | break; | |
538 | } | |
539 | ||
540 | if (header->bDescriptorType == USB_DT_INTERFACE) { | |
541 | struct usb_interface_descriptor *d; | |
542 | int inum; | |
543 | ||
544 | d = (struct usb_interface_descriptor *) header; | |
545 | if (d->bLength < USB_DT_INTERFACE_SIZE) { | |
546 | dev_warn(ddev, "config %d has an invalid " | |
547 | "interface descriptor of length %d, " | |
548 | "skipping\n", cfgno, d->bLength); | |
549 | continue; | |
550 | } | |
551 | ||
552 | inum = d->bInterfaceNumber; | |
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 |
680 | void 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) | |
715 | * | |
716 | * NOTE: if this is a WUSB device and is not authorized, we skip the | |
717 | * whole thing. A non-authorized USB device has no | |
718 | * configurations. | |
719 | */ | |
1da177e4 LT |
720 | int usb_get_configuration(struct usb_device *dev) |
721 | { | |
722 | struct device *ddev = &dev->dev; | |
723 | int ncfg = dev->descriptor.bNumConfigurations; | |
1145065c | 724 | int result = 0; |
1da177e4 LT |
725 | unsigned int cfgno, length; |
726 | unsigned char *buffer; | |
727 | unsigned char *bigbuffer; | |
2c044a48 | 728 | struct usb_config_descriptor *desc; |
1da177e4 | 729 | |
1145065c IPG |
730 | cfgno = 0; |
731 | if (dev->authorized == 0) /* Not really an error */ | |
732 | goto out_not_authorized; | |
733 | result = -ENOMEM; | |
1da177e4 LT |
734 | if (ncfg > USB_MAXCONFIG) { |
735 | dev_warn(ddev, "too many configurations: %d, " | |
736 | "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG); | |
737 | dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG; | |
738 | } | |
739 | ||
740 | if (ncfg < 1) { | |
741 | dev_err(ddev, "no configurations\n"); | |
742 | return -EINVAL; | |
743 | } | |
744 | ||
745 | length = ncfg * sizeof(struct usb_host_config); | |
0a1ef3b5 | 746 | dev->config = kzalloc(length, GFP_KERNEL); |
1da177e4 LT |
747 | if (!dev->config) |
748 | goto err2; | |
1da177e4 LT |
749 | |
750 | length = ncfg * sizeof(char *); | |
0a1ef3b5 | 751 | dev->rawdescriptors = kzalloc(length, GFP_KERNEL); |
1da177e4 LT |
752 | if (!dev->rawdescriptors) |
753 | goto err2; | |
1da177e4 LT |
754 | |
755 | buffer = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL); | |
756 | if (!buffer) | |
757 | goto err2; | |
758 | desc = (struct usb_config_descriptor *)buffer; | |
759 | ||
1145065c IPG |
760 | result = 0; |
761 | for (; cfgno < ncfg; cfgno++) { | |
1da177e4 LT |
762 | /* We grab just the first descriptor so we know how long |
763 | * the whole configuration is */ | |
764 | result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, | |
765 | buffer, USB_DT_CONFIG_SIZE); | |
766 | if (result < 0) { | |
767 | dev_err(ddev, "unable to read config index %d " | |
1145065c | 768 | "descriptor/%s: %d\n", cfgno, "start", result); |
cb4c8fe5 IPG |
769 | dev_err(ddev, "chopping to %d config(s)\n", cfgno); |
770 | dev->descriptor.bNumConfigurations = cfgno; | |
771 | break; | |
1da177e4 LT |
772 | } else if (result < 4) { |
773 | dev_err(ddev, "config index %d descriptor too short " | |
774 | "(expected %i, got %i)\n", cfgno, | |
775 | USB_DT_CONFIG_SIZE, result); | |
776 | result = -EINVAL; | |
777 | goto err; | |
778 | } | |
779 | length = max((int) le16_to_cpu(desc->wTotalLength), | |
780 | USB_DT_CONFIG_SIZE); | |
781 | ||
782 | /* Now that we know the length, get the whole thing */ | |
783 | bigbuffer = kmalloc(length, GFP_KERNEL); | |
784 | if (!bigbuffer) { | |
785 | result = -ENOMEM; | |
786 | goto err; | |
787 | } | |
788 | result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, | |
789 | bigbuffer, length); | |
790 | if (result < 0) { | |
791 | dev_err(ddev, "unable to read config index %d " | |
792 | "descriptor/%s\n", cfgno, "all"); | |
793 | kfree(bigbuffer); | |
794 | goto err; | |
795 | } | |
796 | if (result < length) { | |
797 | dev_warn(ddev, "config index %d descriptor too short " | |
798 | "(expected %i, got %i)\n", cfgno, length, result); | |
799 | length = result; | |
800 | } | |
801 | ||
802 | dev->rawdescriptors[cfgno] = bigbuffer; | |
803 | ||
804 | result = usb_parse_configuration(&dev->dev, cfgno, | |
805 | &dev->config[cfgno], bigbuffer, length); | |
806 | if (result < 0) { | |
807 | ++cfgno; | |
808 | goto err; | |
809 | } | |
810 | } | |
811 | result = 0; | |
812 | ||
813 | err: | |
814 | kfree(buffer); | |
1145065c | 815 | out_not_authorized: |
1da177e4 LT |
816 | dev->descriptor.bNumConfigurations = cfgno; |
817 | err2: | |
818 | if (result == -ENOMEM) | |
819 | dev_err(ddev, "out of memory\n"); | |
820 | return result; | |
821 | } |