Commit | Line | Data |
---|---|---|
1da177e4 | 1 | #include <linux/usb.h> |
615ae11b | 2 | #include <linux/usb/ch9.h> |
27729aad | 3 | #include <linux/usb/hcd.h> |
317149c6 | 4 | #include <linux/usb/quirks.h> |
1da177e4 LT |
5 | #include <linux/module.h> |
6 | #include <linux/init.h> | |
7 | #include <linux/slab.h> | |
8 | #include <linux/device.h> | |
9 | #include <asm/byteorder.h> | |
6d5e8254 | 10 | #include "usb.h" |
27729aad | 11 | |
1da177e4 LT |
12 | |
13 | #define USB_MAXALTSETTING 128 /* Hard limit */ | |
14 | #define USB_MAXENDPOINTS 30 /* Hard limit */ | |
15 | ||
16 | #define USB_MAXCONFIG 8 /* Arbitrary limit */ | |
17 | ||
18 | ||
19 | static inline const char *plural(int n) | |
20 | { | |
21 | return (n == 1 ? "" : "s"); | |
22 | } | |
23 | ||
24 | static int find_next_descriptor(unsigned char *buffer, int size, | |
25 | int dt1, int dt2, int *num_skipped) | |
26 | { | |
27 | struct usb_descriptor_header *h; | |
28 | int n = 0; | |
29 | unsigned char *buffer0 = buffer; | |
30 | ||
31 | /* Find the next descriptor of type dt1 or dt2 */ | |
32 | while (size > 0) { | |
33 | h = (struct usb_descriptor_header *) buffer; | |
34 | if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2) | |
35 | break; | |
36 | buffer += h->bLength; | |
37 | size -= h->bLength; | |
38 | ++n; | |
39 | } | |
40 | ||
41 | /* Store the number of descriptors skipped and return the | |
42 | * number of bytes skipped */ | |
43 | if (num_skipped) | |
44 | *num_skipped = n; | |
45 | return buffer - buffer0; | |
46 | } | |
47 | ||
842f1690 | 48 | static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno, |
663c30d0 | 49 | int inum, int asnum, struct usb_host_endpoint *ep, |
842f1690 | 50 | unsigned char *buffer, int size) |
663c30d0 | 51 | { |
842f1690 | 52 | struct usb_ss_ep_comp_descriptor *desc; |
663c30d0 | 53 | int max_tx; |
663c30d0 | 54 | |
842f1690 AS |
55 | /* The SuperSpeed endpoint companion descriptor is supposed to |
56 | * be the first thing immediately following the endpoint descriptor. | |
57 | */ | |
f0058c62 | 58 | desc = (struct usb_ss_ep_comp_descriptor *) buffer; |
842f1690 AS |
59 | if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP || |
60 | size < USB_DT_SS_EP_COMP_SIZE) { | |
663c30d0 SS |
61 | dev_warn(ddev, "No SuperSpeed endpoint companion for config %d " |
62 | " interface %d altsetting %d ep %d: " | |
63 | "using minimum values\n", | |
64 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
842f1690 AS |
65 | |
66 | /* Fill in some default values. | |
67 | * Leave bmAttributes as zero, which will mean no streams for | |
68 | * bulk, and isoc won't support multiple bursts of packets. | |
69 | * With bursts of only one packet, and a Mult of 1, the max | |
70 | * amount of data moved per endpoint service interval is one | |
71 | * packet. | |
663c30d0 | 72 | */ |
842f1690 AS |
73 | ep->ss_ep_comp.bLength = USB_DT_SS_EP_COMP_SIZE; |
74 | ep->ss_ep_comp.bDescriptorType = USB_DT_SS_ENDPOINT_COMP; | |
75 | if (usb_endpoint_xfer_isoc(&ep->desc) || | |
76 | usb_endpoint_xfer_int(&ep->desc)) | |
77 | ep->ss_ep_comp.wBytesPerInterval = | |
78 | ep->desc.wMaxPacketSize; | |
79 | return; | |
663c30d0 | 80 | } |
663c30d0 | 81 | |
842f1690 | 82 | memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE); |
663c30d0 SS |
83 | |
84 | /* Check the various values */ | |
85 | if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) { | |
86 | dev_warn(ddev, "Control endpoint with bMaxBurst = %d in " | |
87 | "config %d interface %d altsetting %d ep %d: " | |
88 | "setting to zero\n", desc->bMaxBurst, | |
89 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
842f1690 AS |
90 | ep->ss_ep_comp.bMaxBurst = 0; |
91 | } else if (desc->bMaxBurst > 15) { | |
663c30d0 SS |
92 | dev_warn(ddev, "Endpoint with bMaxBurst = %d in " |
93 | "config %d interface %d altsetting %d ep %d: " | |
94 | "setting to 15\n", desc->bMaxBurst, | |
95 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
842f1690 | 96 | ep->ss_ep_comp.bMaxBurst = 15; |
663c30d0 | 97 | } |
842f1690 AS |
98 | |
99 | if ((usb_endpoint_xfer_control(&ep->desc) || | |
100 | usb_endpoint_xfer_int(&ep->desc)) && | |
101 | desc->bmAttributes != 0) { | |
663c30d0 SS |
102 | dev_warn(ddev, "%s endpoint with bmAttributes = %d in " |
103 | "config %d interface %d altsetting %d ep %d: " | |
104 | "setting to zero\n", | |
105 | usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk", | |
106 | desc->bmAttributes, | |
107 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
842f1690 AS |
108 | ep->ss_ep_comp.bmAttributes = 0; |
109 | } else if (usb_endpoint_xfer_bulk(&ep->desc) && | |
110 | desc->bmAttributes > 16) { | |
663c30d0 SS |
111 | dev_warn(ddev, "Bulk endpoint with more than 65536 streams in " |
112 | "config %d interface %d altsetting %d ep %d: " | |
113 | "setting to max\n", | |
114 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
842f1690 AS |
115 | ep->ss_ep_comp.bmAttributes = 16; |
116 | } else if (usb_endpoint_xfer_isoc(&ep->desc) && | |
117 | desc->bmAttributes > 2) { | |
663c30d0 SS |
118 | dev_warn(ddev, "Isoc endpoint has Mult of %d in " |
119 | "config %d interface %d altsetting %d ep %d: " | |
120 | "setting to 3\n", desc->bmAttributes + 1, | |
121 | cfgno, inum, asnum, ep->desc.bEndpointAddress); | |
842f1690 | 122 | ep->ss_ep_comp.bmAttributes = 2; |
663c30d0 | 123 | } |
842f1690 AS |
124 | |
125 | if (usb_endpoint_xfer_isoc(&ep->desc)) | |
7de7c7d2 | 126 | max_tx = (desc->bMaxBurst + 1) * (desc->bmAttributes + 1) * |
29cc8897 | 127 | usb_endpoint_maxp(&ep->desc); |
842f1690 | 128 | else if (usb_endpoint_xfer_int(&ep->desc)) |
29cc8897 | 129 | max_tx = usb_endpoint_maxp(&ep->desc) * |
7de7c7d2 | 130 | (desc->bMaxBurst + 1); |
842f1690 AS |
131 | else |
132 | max_tx = 999999; | |
64b3c304 | 133 | if (le16_to_cpu(desc->wBytesPerInterval) > max_tx) { |
663c30d0 SS |
134 | dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in " |
135 | "config %d interface %d altsetting %d ep %d: " | |
136 | "setting to %d\n", | |
137 | usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int", | |
7de7c7d2 | 138 | le16_to_cpu(desc->wBytesPerInterval), |
663c30d0 SS |
139 | cfgno, inum, asnum, ep->desc.bEndpointAddress, |
140 | max_tx); | |
7de7c7d2 | 141 | ep->ss_ep_comp.wBytesPerInterval = cpu_to_le16(max_tx); |
663c30d0 | 142 | } |
663c30d0 SS |
143 | } |
144 | ||
1da177e4 LT |
145 | static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, |
146 | int asnum, struct usb_host_interface *ifp, int num_ep, | |
147 | unsigned char *buffer, int size) | |
148 | { | |
149 | unsigned char *buffer0 = buffer; | |
150 | struct usb_endpoint_descriptor *d; | |
151 | struct usb_host_endpoint *endpoint; | |
663c30d0 | 152 | int n, i, j, retval; |
1da177e4 LT |
153 | |
154 | d = (struct usb_endpoint_descriptor *) buffer; | |
155 | buffer += d->bLength; | |
156 | size -= d->bLength; | |
157 | ||
158 | if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE) | |
159 | n = USB_DT_ENDPOINT_AUDIO_SIZE; | |
160 | else if (d->bLength >= USB_DT_ENDPOINT_SIZE) | |
161 | n = USB_DT_ENDPOINT_SIZE; | |
162 | else { | |
163 | dev_warn(ddev, "config %d interface %d altsetting %d has an " | |
164 | "invalid endpoint descriptor of length %d, skipping\n", | |
165 | cfgno, inum, asnum, d->bLength); | |
166 | goto skip_to_next_endpoint_or_interface_descriptor; | |
167 | } | |
168 | ||
169 | i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK; | |
170 | if (i >= 16 || i == 0) { | |
171 | dev_warn(ddev, "config %d interface %d altsetting %d has an " | |
172 | "invalid endpoint with address 0x%X, skipping\n", | |
173 | cfgno, inum, asnum, d->bEndpointAddress); | |
174 | goto skip_to_next_endpoint_or_interface_descriptor; | |
175 | } | |
176 | ||
177 | /* Only store as many endpoints as we have room for */ | |
178 | if (ifp->desc.bNumEndpoints >= num_ep) | |
179 | goto skip_to_next_endpoint_or_interface_descriptor; | |
180 | ||
181 | endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints]; | |
182 | ++ifp->desc.bNumEndpoints; | |
183 | ||
184 | memcpy(&endpoint->desc, d, n); | |
185 | INIT_LIST_HEAD(&endpoint->urb_list); | |
186 | ||
300871cd LP |
187 | /* Fix up bInterval values outside the legal range. Use 32 ms if no |
188 | * proper value can be guessed. */ | |
615ae11b AS |
189 | i = 0; /* i = min, j = max, n = default */ |
190 | j = 255; | |
191 | if (usb_endpoint_xfer_int(d)) { | |
192 | i = 1; | |
193 | switch (to_usb_device(ddev)->speed) { | |
6b403b02 | 194 | case USB_SPEED_SUPER: |
615ae11b | 195 | case USB_SPEED_HIGH: |
300871cd LP |
196 | /* Many device manufacturers are using full-speed |
197 | * bInterval values in high-speed interrupt endpoint | |
198 | * descriptors. Try to fix those and fall back to a | |
199 | * 32 ms default value otherwise. */ | |
200 | n = fls(d->bInterval*8); | |
201 | if (n == 0) | |
202 | n = 9; /* 32 ms = 2^(9-1) uframes */ | |
615ae11b AS |
203 | j = 16; |
204 | break; | |
205 | default: /* USB_SPEED_FULL or _LOW */ | |
206 | /* For low-speed, 10 ms is the official minimum. | |
207 | * But some "overclocked" devices might want faster | |
208 | * polling so we'll allow it. */ | |
209 | n = 32; | |
210 | break; | |
211 | } | |
212 | } else if (usb_endpoint_xfer_isoc(d)) { | |
213 | i = 1; | |
214 | j = 16; | |
215 | switch (to_usb_device(ddev)->speed) { | |
216 | case USB_SPEED_HIGH: | |
217 | n = 9; /* 32 ms = 2^(9-1) uframes */ | |
218 | break; | |
219 | default: /* USB_SPEED_FULL */ | |
220 | n = 6; /* 32 ms = 2^(6-1) frames */ | |
221 | break; | |
222 | } | |
223 | } | |
224 | if (d->bInterval < i || d->bInterval > j) { | |
225 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
226 | "endpoint 0x%X has an invalid bInterval %d, " | |
227 | "changing to %d\n", | |
228 | cfgno, inum, asnum, | |
229 | d->bEndpointAddress, d->bInterval, n); | |
230 | endpoint->desc.bInterval = n; | |
231 | } | |
232 | ||
60aac1ec AS |
233 | /* Some buggy low-speed devices have Bulk endpoints, which is |
234 | * explicitly forbidden by the USB spec. In an attempt to make | |
235 | * them usable, we will try treating them as Interrupt endpoints. | |
236 | */ | |
237 | if (to_usb_device(ddev)->speed == USB_SPEED_LOW && | |
238 | usb_endpoint_xfer_bulk(d)) { | |
239 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
240 | "endpoint 0x%X is Bulk; changing to Interrupt\n", | |
241 | cfgno, inum, asnum, d->bEndpointAddress); | |
242 | endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT; | |
243 | endpoint->desc.bInterval = 1; | |
29cc8897 | 244 | if (usb_endpoint_maxp(&endpoint->desc) > 8) |
60aac1ec AS |
245 | endpoint->desc.wMaxPacketSize = cpu_to_le16(8); |
246 | } | |
247 | ||
caa9ef67 DB |
248 | /* |
249 | * Some buggy high speed devices have bulk endpoints using | |
250 | * maxpacket sizes other than 512. High speed HCDs may not | |
251 | * be able to handle that particular bug, so let's warn... | |
252 | */ | |
253 | if (to_usb_device(ddev)->speed == USB_SPEED_HIGH | |
254 | && usb_endpoint_xfer_bulk(d)) { | |
255 | unsigned maxp; | |
256 | ||
29cc8897 | 257 | maxp = usb_endpoint_maxp(&endpoint->desc) & 0x07ff; |
caa9ef67 DB |
258 | if (maxp != 512) |
259 | dev_warn(ddev, "config %d interface %d altsetting %d " | |
260 | "bulk endpoint 0x%X has invalid maxpacket %d\n", | |
261 | cfgno, inum, asnum, d->bEndpointAddress, | |
262 | maxp); | |
263 | } | |
663c30d0 | 264 | |
842f1690 AS |
265 | /* Parse a possible SuperSpeed endpoint companion descriptor */ |
266 | if (to_usb_device(ddev)->speed == USB_SPEED_SUPER) | |
267 | usb_parse_ss_endpoint_companion(ddev, cfgno, | |
268 | inum, asnum, endpoint, buffer, size); | |
9f8e4438 | 269 | |
842f1690 AS |
270 | /* Skip over any Class Specific or Vendor Specific descriptors; |
271 | * find the next endpoint or interface descriptor */ | |
272 | endpoint->extra = buffer; | |
273 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
274 | USB_DT_INTERFACE, &n); | |
275 | endpoint->extralen = i; | |
276 | retval = buffer - buffer0 + i; | |
1da177e4 LT |
277 | if (n > 0) |
278 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
279 | n, plural(n), "endpoint"); | |
663c30d0 | 280 | return retval; |
1da177e4 LT |
281 | |
282 | skip_to_next_endpoint_or_interface_descriptor: | |
283 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
284 | USB_DT_INTERFACE, NULL); | |
285 | return buffer - buffer0 + i; | |
286 | } | |
287 | ||
288 | void usb_release_interface_cache(struct kref *ref) | |
289 | { | |
290 | struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref); | |
291 | int j; | |
292 | ||
4f62efe6 AS |
293 | for (j = 0; j < intfc->num_altsetting; j++) { |
294 | struct usb_host_interface *alt = &intfc->altsetting[j]; | |
295 | ||
296 | kfree(alt->endpoint); | |
297 | kfree(alt->string); | |
298 | } | |
1da177e4 LT |
299 | kfree(intfc); |
300 | } | |
301 | ||
302 | static int usb_parse_interface(struct device *ddev, int cfgno, | |
303 | struct usb_host_config *config, unsigned char *buffer, int size, | |
304 | u8 inums[], u8 nalts[]) | |
305 | { | |
306 | unsigned char *buffer0 = buffer; | |
307 | struct usb_interface_descriptor *d; | |
308 | int inum, asnum; | |
309 | struct usb_interface_cache *intfc; | |
310 | struct usb_host_interface *alt; | |
311 | int i, n; | |
312 | int len, retval; | |
313 | int num_ep, num_ep_orig; | |
314 | ||
315 | d = (struct usb_interface_descriptor *) buffer; | |
316 | buffer += d->bLength; | |
317 | size -= d->bLength; | |
318 | ||
319 | if (d->bLength < USB_DT_INTERFACE_SIZE) | |
320 | goto skip_to_next_interface_descriptor; | |
321 | ||
322 | /* Which interface entry is this? */ | |
323 | intfc = NULL; | |
324 | inum = d->bInterfaceNumber; | |
325 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
326 | if (inums[i] == inum) { | |
327 | intfc = config->intf_cache[i]; | |
328 | break; | |
329 | } | |
330 | } | |
331 | if (!intfc || intfc->num_altsetting >= nalts[i]) | |
332 | goto skip_to_next_interface_descriptor; | |
333 | ||
334 | /* Check for duplicate altsetting entries */ | |
335 | asnum = d->bAlternateSetting; | |
336 | for ((i = 0, alt = &intfc->altsetting[0]); | |
337 | i < intfc->num_altsetting; | |
338 | (++i, ++alt)) { | |
339 | if (alt->desc.bAlternateSetting == asnum) { | |
340 | dev_warn(ddev, "Duplicate descriptor for config %d " | |
341 | "interface %d altsetting %d, skipping\n", | |
342 | cfgno, inum, asnum); | |
343 | goto skip_to_next_interface_descriptor; | |
344 | } | |
345 | } | |
346 | ||
347 | ++intfc->num_altsetting; | |
348 | memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE); | |
349 | ||
350 | /* Skip over any Class Specific or Vendor Specific descriptors; | |
351 | * find the first endpoint or interface descriptor */ | |
352 | alt->extra = buffer; | |
353 | i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT, | |
354 | USB_DT_INTERFACE, &n); | |
355 | alt->extralen = i; | |
356 | if (n > 0) | |
357 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
358 | n, plural(n), "interface"); | |
359 | buffer += i; | |
360 | size -= i; | |
361 | ||
362 | /* Allocate space for the right(?) number of endpoints */ | |
363 | num_ep = num_ep_orig = alt->desc.bNumEndpoints; | |
2c044a48 | 364 | alt->desc.bNumEndpoints = 0; /* Use as a counter */ |
1da177e4 LT |
365 | if (num_ep > USB_MAXENDPOINTS) { |
366 | dev_warn(ddev, "too many endpoints for config %d interface %d " | |
367 | "altsetting %d: %d, using maximum allowed: %d\n", | |
368 | cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS); | |
369 | num_ep = USB_MAXENDPOINTS; | |
370 | } | |
371 | ||
2c044a48 GKH |
372 | if (num_ep > 0) { |
373 | /* Can't allocate 0 bytes */ | |
57a21c1b AS |
374 | len = sizeof(struct usb_host_endpoint) * num_ep; |
375 | alt->endpoint = kzalloc(len, GFP_KERNEL); | |
376 | if (!alt->endpoint) | |
377 | return -ENOMEM; | |
378 | } | |
1da177e4 LT |
379 | |
380 | /* Parse all the endpoint descriptors */ | |
381 | n = 0; | |
382 | while (size > 0) { | |
383 | if (((struct usb_descriptor_header *) buffer)->bDescriptorType | |
384 | == USB_DT_INTERFACE) | |
385 | break; | |
386 | retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt, | |
387 | num_ep, buffer, size); | |
388 | if (retval < 0) | |
389 | return retval; | |
390 | ++n; | |
391 | ||
392 | buffer += retval; | |
393 | size -= retval; | |
394 | } | |
395 | ||
396 | if (n != num_ep_orig) | |
397 | dev_warn(ddev, "config %d interface %d altsetting %d has %d " | |
398 | "endpoint descriptor%s, different from the interface " | |
399 | "descriptor's value: %d\n", | |
400 | cfgno, inum, asnum, n, plural(n), num_ep_orig); | |
401 | return buffer - buffer0; | |
402 | ||
403 | skip_to_next_interface_descriptor: | |
404 | i = find_next_descriptor(buffer, size, USB_DT_INTERFACE, | |
405 | USB_DT_INTERFACE, NULL); | |
406 | return buffer - buffer0 + i; | |
407 | } | |
408 | ||
317149c6 | 409 | static int usb_parse_configuration(struct usb_device *dev, int cfgidx, |
1da177e4 LT |
410 | struct usb_host_config *config, unsigned char *buffer, int size) |
411 | { | |
317149c6 | 412 | struct device *ddev = &dev->dev; |
1da177e4 LT |
413 | unsigned char *buffer0 = buffer; |
414 | int cfgno; | |
415 | int nintf, nintf_orig; | |
416 | int i, j, n; | |
417 | struct usb_interface_cache *intfc; | |
418 | unsigned char *buffer2; | |
419 | int size2; | |
420 | struct usb_descriptor_header *header; | |
421 | int len, retval; | |
422 | u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES]; | |
165fe97e | 423 | unsigned iad_num = 0; |
1da177e4 LT |
424 | |
425 | memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE); | |
426 | if (config->desc.bDescriptorType != USB_DT_CONFIG || | |
427 | config->desc.bLength < USB_DT_CONFIG_SIZE) { | |
428 | dev_err(ddev, "invalid descriptor for config index %d: " | |
429 | "type = 0x%X, length = %d\n", cfgidx, | |
430 | config->desc.bDescriptorType, config->desc.bLength); | |
431 | return -EINVAL; | |
432 | } | |
433 | cfgno = config->desc.bConfigurationValue; | |
434 | ||
435 | buffer += config->desc.bLength; | |
436 | size -= config->desc.bLength; | |
437 | ||
438 | nintf = nintf_orig = config->desc.bNumInterfaces; | |
439 | if (nintf > USB_MAXINTERFACES) { | |
440 | dev_warn(ddev, "config %d has too many interfaces: %d, " | |
441 | "using maximum allowed: %d\n", | |
442 | cfgno, nintf, USB_MAXINTERFACES); | |
443 | nintf = USB_MAXINTERFACES; | |
444 | } | |
445 | ||
446 | /* Go through the descriptors, checking their length and counting the | |
447 | * number of altsettings for each interface */ | |
448 | n = 0; | |
449 | for ((buffer2 = buffer, size2 = size); | |
450 | size2 > 0; | |
451 | (buffer2 += header->bLength, size2 -= header->bLength)) { | |
452 | ||
453 | if (size2 < sizeof(struct usb_descriptor_header)) { | |
454 | dev_warn(ddev, "config %d descriptor has %d excess " | |
455 | "byte%s, ignoring\n", | |
456 | cfgno, size2, plural(size2)); | |
457 | break; | |
458 | } | |
459 | ||
460 | header = (struct usb_descriptor_header *) buffer2; | |
461 | if ((header->bLength > size2) || (header->bLength < 2)) { | |
462 | dev_warn(ddev, "config %d has an invalid descriptor " | |
463 | "of length %d, skipping remainder of the config\n", | |
464 | cfgno, header->bLength); | |
465 | break; | |
466 | } | |
467 | ||
468 | if (header->bDescriptorType == USB_DT_INTERFACE) { | |
469 | struct usb_interface_descriptor *d; | |
470 | int inum; | |
471 | ||
472 | d = (struct usb_interface_descriptor *) header; | |
473 | if (d->bLength < USB_DT_INTERFACE_SIZE) { | |
474 | dev_warn(ddev, "config %d has an invalid " | |
475 | "interface descriptor of length %d, " | |
476 | "skipping\n", cfgno, d->bLength); | |
477 | continue; | |
478 | } | |
479 | ||
480 | inum = d->bInterfaceNumber; | |
317149c6 HG |
481 | |
482 | if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) && | |
483 | n >= nintf_orig) { | |
484 | dev_warn(ddev, "config %d has more interface " | |
485 | "descriptors, than it declares in " | |
486 | "bNumInterfaces, ignoring interface " | |
487 | "number: %d\n", cfgno, inum); | |
488 | continue; | |
489 | } | |
490 | ||
1da177e4 LT |
491 | if (inum >= nintf_orig) |
492 | dev_warn(ddev, "config %d has an invalid " | |
493 | "interface number: %d but max is %d\n", | |
494 | cfgno, inum, nintf_orig - 1); | |
495 | ||
496 | /* Have we already encountered this interface? | |
497 | * Count its altsettings */ | |
498 | for (i = 0; i < n; ++i) { | |
499 | if (inums[i] == inum) | |
500 | break; | |
501 | } | |
502 | if (i < n) { | |
503 | if (nalts[i] < 255) | |
504 | ++nalts[i]; | |
505 | } else if (n < USB_MAXINTERFACES) { | |
506 | inums[n] = inum; | |
507 | nalts[n] = 1; | |
508 | ++n; | |
509 | } | |
510 | ||
165fe97e CN |
511 | } else if (header->bDescriptorType == |
512 | USB_DT_INTERFACE_ASSOCIATION) { | |
513 | if (iad_num == USB_MAXIADS) { | |
514 | dev_warn(ddev, "found more Interface " | |
515 | "Association Descriptors " | |
516 | "than allocated for in " | |
517 | "configuration %d\n", cfgno); | |
518 | } else { | |
519 | config->intf_assoc[iad_num] = | |
520 | (struct usb_interface_assoc_descriptor | |
521 | *)header; | |
522 | iad_num++; | |
523 | } | |
524 | ||
1da177e4 LT |
525 | } else if (header->bDescriptorType == USB_DT_DEVICE || |
526 | header->bDescriptorType == USB_DT_CONFIG) | |
527 | dev_warn(ddev, "config %d contains an unexpected " | |
528 | "descriptor of type 0x%X, skipping\n", | |
529 | cfgno, header->bDescriptorType); | |
530 | ||
531 | } /* for ((buffer2 = buffer, size2 = size); ...) */ | |
532 | size = buffer2 - buffer; | |
533 | config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0); | |
534 | ||
535 | if (n != nintf) | |
536 | dev_warn(ddev, "config %d has %d interface%s, different from " | |
537 | "the descriptor's value: %d\n", | |
538 | cfgno, n, plural(n), nintf_orig); | |
539 | else if (n == 0) | |
540 | dev_warn(ddev, "config %d has no interfaces?\n", cfgno); | |
541 | config->desc.bNumInterfaces = nintf = n; | |
542 | ||
543 | /* Check for missing interface numbers */ | |
544 | for (i = 0; i < nintf; ++i) { | |
545 | for (j = 0; j < nintf; ++j) { | |
546 | if (inums[j] == i) | |
547 | break; | |
548 | } | |
549 | if (j >= nintf) | |
550 | dev_warn(ddev, "config %d has no interface number " | |
551 | "%d\n", cfgno, i); | |
552 | } | |
553 | ||
554 | /* Allocate the usb_interface_caches and altsetting arrays */ | |
555 | for (i = 0; i < nintf; ++i) { | |
556 | j = nalts[i]; | |
557 | if (j > USB_MAXALTSETTING) { | |
558 | dev_warn(ddev, "too many alternate settings for " | |
559 | "config %d interface %d: %d, " | |
560 | "using maximum allowed: %d\n", | |
561 | cfgno, inums[i], j, USB_MAXALTSETTING); | |
562 | nalts[i] = j = USB_MAXALTSETTING; | |
563 | } | |
564 | ||
565 | len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j; | |
0a1ef3b5 | 566 | config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL); |
1da177e4 LT |
567 | if (!intfc) |
568 | return -ENOMEM; | |
1da177e4 LT |
569 | kref_init(&intfc->ref); |
570 | } | |
571 | ||
663c30d0 SS |
572 | /* FIXME: parse the BOS descriptor */ |
573 | ||
1da177e4 LT |
574 | /* Skip over any Class Specific or Vendor Specific descriptors; |
575 | * find the first interface descriptor */ | |
576 | config->extra = buffer; | |
577 | i = find_next_descriptor(buffer, size, USB_DT_INTERFACE, | |
578 | USB_DT_INTERFACE, &n); | |
579 | config->extralen = i; | |
580 | if (n > 0) | |
581 | dev_dbg(ddev, "skipped %d descriptor%s after %s\n", | |
582 | n, plural(n), "configuration"); | |
583 | buffer += i; | |
584 | size -= i; | |
585 | ||
586 | /* Parse all the interface/altsetting descriptors */ | |
587 | while (size > 0) { | |
588 | retval = usb_parse_interface(ddev, cfgno, config, | |
589 | buffer, size, inums, nalts); | |
590 | if (retval < 0) | |
591 | return retval; | |
592 | ||
593 | buffer += retval; | |
594 | size -= retval; | |
595 | } | |
596 | ||
597 | /* Check for missing altsettings */ | |
598 | for (i = 0; i < nintf; ++i) { | |
599 | intfc = config->intf_cache[i]; | |
600 | for (j = 0; j < intfc->num_altsetting; ++j) { | |
601 | for (n = 0; n < intfc->num_altsetting; ++n) { | |
602 | if (intfc->altsetting[n].desc. | |
603 | bAlternateSetting == j) | |
604 | break; | |
605 | } | |
606 | if (n >= intfc->num_altsetting) | |
607 | dev_warn(ddev, "config %d interface %d has no " | |
608 | "altsetting %d\n", cfgno, inums[i], j); | |
609 | } | |
610 | } | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
2c044a48 GKH |
615 | /* hub-only!! ... and only exported for reset/reinit path. |
616 | * otherwise used internally on disconnect/destroy path | |
617 | */ | |
1da177e4 LT |
618 | void usb_destroy_configuration(struct usb_device *dev) |
619 | { | |
620 | int c, i; | |
621 | ||
622 | if (!dev->config) | |
623 | return; | |
624 | ||
625 | if (dev->rawdescriptors) { | |
626 | for (i = 0; i < dev->descriptor.bNumConfigurations; i++) | |
627 | kfree(dev->rawdescriptors[i]); | |
628 | ||
629 | kfree(dev->rawdescriptors); | |
630 | dev->rawdescriptors = NULL; | |
631 | } | |
632 | ||
633 | for (c = 0; c < dev->descriptor.bNumConfigurations; c++) { | |
634 | struct usb_host_config *cf = &dev->config[c]; | |
635 | ||
636 | kfree(cf->string); | |
1da177e4 LT |
637 | for (i = 0; i < cf->desc.bNumInterfaces; i++) { |
638 | if (cf->intf_cache[i]) | |
2c044a48 | 639 | kref_put(&cf->intf_cache[i]->ref, |
1da177e4 LT |
640 | usb_release_interface_cache); |
641 | } | |
642 | } | |
643 | kfree(dev->config); | |
644 | dev->config = NULL; | |
645 | } | |
646 | ||
647 | ||
1145065c IPG |
648 | /* |
649 | * Get the USB config descriptors, cache and parse'em | |
650 | * | |
651 | * hub-only!! ... and only in reset path, or usb_new_device() | |
652 | * (used by real hubs and virtual root hubs) | |
653 | * | |
654 | * NOTE: if this is a WUSB device and is not authorized, we skip the | |
655 | * whole thing. A non-authorized USB device has no | |
656 | * configurations. | |
657 | */ | |
1da177e4 LT |
658 | int usb_get_configuration(struct usb_device *dev) |
659 | { | |
660 | struct device *ddev = &dev->dev; | |
661 | int ncfg = dev->descriptor.bNumConfigurations; | |
1145065c | 662 | int result = 0; |
1da177e4 | 663 | unsigned int cfgno, length; |
1da177e4 | 664 | unsigned char *bigbuffer; |
2c044a48 | 665 | struct usb_config_descriptor *desc; |
1da177e4 | 666 | |
1145065c IPG |
667 | cfgno = 0; |
668 | if (dev->authorized == 0) /* Not really an error */ | |
669 | goto out_not_authorized; | |
670 | result = -ENOMEM; | |
1da177e4 LT |
671 | if (ncfg > USB_MAXCONFIG) { |
672 | dev_warn(ddev, "too many configurations: %d, " | |
673 | "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG); | |
674 | dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG; | |
675 | } | |
676 | ||
677 | if (ncfg < 1) { | |
678 | dev_err(ddev, "no configurations\n"); | |
679 | return -EINVAL; | |
680 | } | |
681 | ||
682 | length = ncfg * sizeof(struct usb_host_config); | |
0a1ef3b5 | 683 | dev->config = kzalloc(length, GFP_KERNEL); |
1da177e4 LT |
684 | if (!dev->config) |
685 | goto err2; | |
1da177e4 LT |
686 | |
687 | length = ncfg * sizeof(char *); | |
0a1ef3b5 | 688 | dev->rawdescriptors = kzalloc(length, GFP_KERNEL); |
1da177e4 LT |
689 | if (!dev->rawdescriptors) |
690 | goto err2; | |
1da177e4 | 691 | |
e8f4af30 MN |
692 | desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL); |
693 | if (!desc) | |
1da177e4 | 694 | goto err2; |
1da177e4 | 695 | |
1145065c IPG |
696 | result = 0; |
697 | for (; cfgno < ncfg; cfgno++) { | |
1da177e4 LT |
698 | /* We grab just the first descriptor so we know how long |
699 | * the whole configuration is */ | |
700 | result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, | |
e8f4af30 | 701 | desc, USB_DT_CONFIG_SIZE); |
1da177e4 LT |
702 | if (result < 0) { |
703 | dev_err(ddev, "unable to read config index %d " | |
1145065c | 704 | "descriptor/%s: %d\n", cfgno, "start", result); |
cb4c8fe5 IPG |
705 | dev_err(ddev, "chopping to %d config(s)\n", cfgno); |
706 | dev->descriptor.bNumConfigurations = cfgno; | |
707 | break; | |
1da177e4 LT |
708 | } else if (result < 4) { |
709 | dev_err(ddev, "config index %d descriptor too short " | |
710 | "(expected %i, got %i)\n", cfgno, | |
711 | USB_DT_CONFIG_SIZE, result); | |
712 | result = -EINVAL; | |
713 | goto err; | |
714 | } | |
715 | length = max((int) le16_to_cpu(desc->wTotalLength), | |
716 | USB_DT_CONFIG_SIZE); | |
717 | ||
718 | /* Now that we know the length, get the whole thing */ | |
719 | bigbuffer = kmalloc(length, GFP_KERNEL); | |
720 | if (!bigbuffer) { | |
721 | result = -ENOMEM; | |
722 | goto err; | |
723 | } | |
724 | result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, | |
725 | bigbuffer, length); | |
726 | if (result < 0) { | |
727 | dev_err(ddev, "unable to read config index %d " | |
728 | "descriptor/%s\n", cfgno, "all"); | |
729 | kfree(bigbuffer); | |
730 | goto err; | |
731 | } | |
732 | if (result < length) { | |
733 | dev_warn(ddev, "config index %d descriptor too short " | |
734 | "(expected %i, got %i)\n", cfgno, length, result); | |
735 | length = result; | |
736 | } | |
737 | ||
738 | dev->rawdescriptors[cfgno] = bigbuffer; | |
739 | ||
317149c6 | 740 | result = usb_parse_configuration(dev, cfgno, |
1da177e4 LT |
741 | &dev->config[cfgno], bigbuffer, length); |
742 | if (result < 0) { | |
743 | ++cfgno; | |
744 | goto err; | |
745 | } | |
746 | } | |
747 | result = 0; | |
748 | ||
749 | err: | |
e8f4af30 | 750 | kfree(desc); |
1145065c | 751 | out_not_authorized: |
1da177e4 LT |
752 | dev->descriptor.bNumConfigurations = cfgno; |
753 | err2: | |
754 | if (result == -ENOMEM) | |
755 | dev_err(ddev, "out of memory\n"); | |
756 | return result; | |
757 | } |