Commit | Line | Data |
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ddf8abd2 | 1 | /* |
5ab54cf7 | 2 | * f_fs.c -- user mode file system API for USB composite function controllers |
ddf8abd2 MN |
3 | * |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * Author: Michal Nazarewicz <m.nazarewicz@samsung.com> | |
6 | * | |
5ab54cf7 | 7 | * Based on inode.c (GadgetFS) which was: |
ddf8abd2 MN |
8 | * Copyright (C) 2003-2004 David Brownell |
9 | * Copyright (C) 2003 Agilent Technologies | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
ddf8abd2 MN |
15 | */ |
16 | ||
17 | ||
18 | /* #define DEBUG */ | |
19 | /* #define VERBOSE_DEBUG */ | |
20 | ||
21 | #include <linux/blkdev.h> | |
b0608690 | 22 | #include <linux/pagemap.h> |
f940fcd8 | 23 | #include <linux/export.h> |
ddf8abd2 | 24 | #include <asm/unaligned.h> |
ddf8abd2 MN |
25 | |
26 | #include <linux/usb/composite.h> | |
27 | #include <linux/usb/functionfs.h> | |
28 | ||
29 | ||
30 | #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ | |
31 | ||
32 | ||
5ab54cf7 | 33 | /* Debugging ****************************************************************/ |
ddf8abd2 MN |
34 | |
35 | #ifdef VERBOSE_DEBUG | |
d8df0b61 | 36 | # define pr_vdebug pr_debug |
ddf8abd2 | 37 | # define ffs_dump_mem(prefix, ptr, len) \ |
aa02f172 | 38 | print_hex_dump_bytes(pr_fmt(prefix ": "), DUMP_PREFIX_NONE, ptr, len) |
ddf8abd2 | 39 | #else |
d8df0b61 | 40 | # define pr_vdebug(...) do { } while (0) |
ddf8abd2 | 41 | # define ffs_dump_mem(prefix, ptr, len) do { } while (0) |
d8df0b61 MN |
42 | #endif /* VERBOSE_DEBUG */ |
43 | ||
aa02f172 | 44 | #define ENTER() pr_vdebug("%s()\n", __func__) |
ddf8abd2 MN |
45 | |
46 | ||
47 | /* The data structure and setup file ****************************************/ | |
48 | ||
49 | enum ffs_state { | |
5ab54cf7 MN |
50 | /* |
51 | * Waiting for descriptors and strings. | |
52 | * | |
53 | * In this state no open(2), read(2) or write(2) on epfiles | |
ddf8abd2 | 54 | * may succeed (which should not be the problem as there |
5ab54cf7 MN |
55 | * should be no such files opened in the first place). |
56 | */ | |
ddf8abd2 MN |
57 | FFS_READ_DESCRIPTORS, |
58 | FFS_READ_STRINGS, | |
59 | ||
5ab54cf7 MN |
60 | /* |
61 | * We've got descriptors and strings. We are or have called | |
ddf8abd2 | 62 | * functionfs_ready_callback(). functionfs_bind() may have |
5ab54cf7 MN |
63 | * been called but we don't know. |
64 | * | |
65 | * This is the only state in which operations on epfiles may | |
66 | * succeed. | |
67 | */ | |
ddf8abd2 MN |
68 | FFS_ACTIVE, |
69 | ||
5ab54cf7 MN |
70 | /* |
71 | * All endpoints have been closed. This state is also set if | |
ddf8abd2 MN |
72 | * we encounter an unrecoverable error. The only |
73 | * unrecoverable error is situation when after reading strings | |
5ab54cf7 MN |
74 | * from user space we fail to initialise epfiles or |
75 | * functionfs_ready_callback() returns with error (<0). | |
76 | * | |
77 | * In this state no open(2), read(2) or write(2) (both on ep0 | |
ddf8abd2 MN |
78 | * as well as epfile) may succeed (at this point epfiles are |
79 | * unlinked and all closed so this is not a problem; ep0 is | |
80 | * also closed but ep0 file exists and so open(2) on ep0 must | |
5ab54cf7 MN |
81 | * fail). |
82 | */ | |
ddf8abd2 MN |
83 | FFS_CLOSING |
84 | }; | |
85 | ||
86 | ||
87 | enum ffs_setup_state { | |
88 | /* There is no setup request pending. */ | |
89 | FFS_NO_SETUP, | |
5ab54cf7 MN |
90 | /* |
91 | * User has read events and there was a setup request event | |
ddf8abd2 | 92 | * there. The next read/write on ep0 will handle the |
5ab54cf7 MN |
93 | * request. |
94 | */ | |
ddf8abd2 | 95 | FFS_SETUP_PENDING, |
5ab54cf7 MN |
96 | /* |
97 | * There was event pending but before user space handled it | |
ddf8abd2 MN |
98 | * some other event was introduced which canceled existing |
99 | * setup. If this state is set read/write on ep0 return | |
5ab54cf7 MN |
100 | * -EIDRM. This state is only set when adding event. |
101 | */ | |
ddf8abd2 MN |
102 | FFS_SETUP_CANCELED |
103 | }; | |
104 | ||
105 | ||
106 | ||
107 | struct ffs_epfile; | |
108 | struct ffs_function; | |
109 | ||
110 | struct ffs_data { | |
111 | struct usb_gadget *gadget; | |
112 | ||
5ab54cf7 MN |
113 | /* |
114 | * Protect access read/write operations, only one read/write | |
ddf8abd2 MN |
115 | * at a time. As a consequence protects ep0req and company. |
116 | * While setup request is being processed (queued) this is | |
5ab54cf7 MN |
117 | * held. |
118 | */ | |
ddf8abd2 MN |
119 | struct mutex mutex; |
120 | ||
5ab54cf7 MN |
121 | /* |
122 | * Protect access to endpoint related structures (basically | |
ddf8abd2 | 123 | * usb_ep_queue(), usb_ep_dequeue(), etc. calls) except for |
5ab54cf7 MN |
124 | * endpoint zero. |
125 | */ | |
ddf8abd2 MN |
126 | spinlock_t eps_lock; |
127 | ||
5ab54cf7 MN |
128 | /* |
129 | * XXX REVISIT do we need our own request? Since we are not | |
130 | * handling setup requests immediately user space may be so | |
ddf8abd2 MN |
131 | * slow that another setup will be sent to the gadget but this |
132 | * time not to us but another function and then there could be | |
a4ce96ac | 133 | * a race. Is that the case? Or maybe we can use cdev->req |
5ab54cf7 MN |
134 | * after all, maybe we just need some spinlock for that? |
135 | */ | |
ddf8abd2 MN |
136 | struct usb_request *ep0req; /* P: mutex */ |
137 | struct completion ep0req_completion; /* P: mutex */ | |
138 | int ep0req_status; /* P: mutex */ | |
139 | ||
140 | /* reference counter */ | |
141 | atomic_t ref; | |
142 | /* how many files are opened (EP0 and others) */ | |
143 | atomic_t opened; | |
144 | ||
145 | /* EP0 state */ | |
146 | enum ffs_state state; | |
147 | ||
148 | /* | |
5ab54cf7 | 149 | * Possible transitions: |
ddf8abd2 MN |
150 | * + FFS_NO_SETUP -> FFS_SETUP_PENDING -- P: ev.waitq.lock |
151 | * happens only in ep0 read which is P: mutex | |
152 | * + FFS_SETUP_PENDING -> FFS_NO_SETUP -- P: ev.waitq.lock | |
153 | * happens only in ep0 i/o which is P: mutex | |
154 | * + FFS_SETUP_PENDING -> FFS_SETUP_CANCELED -- P: ev.waitq.lock | |
155 | * + FFS_SETUP_CANCELED -> FFS_NO_SETUP -- cmpxchg | |
156 | */ | |
157 | enum ffs_setup_state setup_state; | |
158 | ||
159 | #define FFS_SETUP_STATE(ffs) \ | |
160 | ((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \ | |
161 | FFS_SETUP_CANCELED, FFS_NO_SETUP)) | |
162 | ||
163 | /* Events & such. */ | |
164 | struct { | |
165 | u8 types[4]; | |
166 | unsigned short count; | |
167 | /* XXX REVISIT need to update it in some places, or do we? */ | |
168 | unsigned short can_stall; | |
169 | struct usb_ctrlrequest setup; | |
170 | ||
171 | wait_queue_head_t waitq; | |
172 | } ev; /* the whole structure, P: ev.waitq.lock */ | |
173 | ||
174 | /* Flags */ | |
175 | unsigned long flags; | |
176 | #define FFS_FL_CALL_CLOSED_CALLBACK 0 | |
177 | #define FFS_FL_BOUND 1 | |
178 | ||
179 | /* Active function */ | |
180 | struct ffs_function *func; | |
181 | ||
5ab54cf7 MN |
182 | /* |
183 | * Device name, write once when file system is mounted. | |
184 | * Intended for user to read if she wants. | |
185 | */ | |
ddf8abd2 | 186 | const char *dev_name; |
5ab54cf7 | 187 | /* Private data for our user (ie. gadget). Managed by user. */ |
ddf8abd2 MN |
188 | void *private_data; |
189 | ||
190 | /* filled by __ffs_data_got_descs() */ | |
5ab54cf7 MN |
191 | /* |
192 | * Real descriptors are 16 bytes after raw_descs (so you need | |
ddf8abd2 MN |
193 | * to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the |
194 | * first full speed descriptor). raw_descs_length and | |
5ab54cf7 MN |
195 | * raw_fs_descs_length do not have those 16 bytes added. |
196 | */ | |
ddf8abd2 MN |
197 | const void *raw_descs; |
198 | unsigned raw_descs_length; | |
199 | unsigned raw_fs_descs_length; | |
200 | unsigned fs_descs_count; | |
201 | unsigned hs_descs_count; | |
202 | ||
203 | unsigned short strings_count; | |
204 | unsigned short interfaces_count; | |
205 | unsigned short eps_count; | |
206 | unsigned short _pad1; | |
207 | ||
208 | /* filled by __ffs_data_got_strings() */ | |
209 | /* ids in stringtabs are set in functionfs_bind() */ | |
210 | const void *raw_strings; | |
211 | struct usb_gadget_strings **stringtabs; | |
212 | ||
5ab54cf7 MN |
213 | /* |
214 | * File system's super block, write once when file system is | |
215 | * mounted. | |
216 | */ | |
ddf8abd2 MN |
217 | struct super_block *sb; |
218 | ||
5ab54cf7 | 219 | /* File permissions, written once when fs is mounted */ |
ddf8abd2 MN |
220 | struct ffs_file_perms { |
221 | umode_t mode; | |
222 | uid_t uid; | |
223 | gid_t gid; | |
224 | } file_perms; | |
225 | ||
5ab54cf7 MN |
226 | /* |
227 | * The endpoint files, filled by ffs_epfiles_create(), | |
228 | * destroyed by ffs_epfiles_destroy(). | |
229 | */ | |
ddf8abd2 MN |
230 | struct ffs_epfile *epfiles; |
231 | }; | |
232 | ||
233 | /* Reference counter handling */ | |
234 | static void ffs_data_get(struct ffs_data *ffs); | |
235 | static void ffs_data_put(struct ffs_data *ffs); | |
236 | /* Creates new ffs_data object. */ | |
237 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); | |
238 | ||
239 | /* Opened counter handling. */ | |
240 | static void ffs_data_opened(struct ffs_data *ffs); | |
241 | static void ffs_data_closed(struct ffs_data *ffs); | |
242 | ||
5ab54cf7 | 243 | /* Called with ffs->mutex held; take over ownership of data. */ |
ddf8abd2 MN |
244 | static int __must_check |
245 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); | |
246 | static int __must_check | |
247 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); | |
248 | ||
249 | ||
250 | /* The function structure ***************************************************/ | |
251 | ||
252 | struct ffs_ep; | |
253 | ||
254 | struct ffs_function { | |
255 | struct usb_configuration *conf; | |
256 | struct usb_gadget *gadget; | |
257 | struct ffs_data *ffs; | |
258 | ||
259 | struct ffs_ep *eps; | |
260 | u8 eps_revmap[16]; | |
261 | short *interfaces_nums; | |
262 | ||
263 | struct usb_function function; | |
264 | }; | |
265 | ||
266 | ||
267 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) | |
268 | { | |
269 | return container_of(f, struct ffs_function, function); | |
270 | } | |
271 | ||
272 | static void ffs_func_free(struct ffs_function *func); | |
273 | ||
ddf8abd2 MN |
274 | static void ffs_func_eps_disable(struct ffs_function *func); |
275 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); | |
276 | ||
ddf8abd2 MN |
277 | static int ffs_func_bind(struct usb_configuration *, |
278 | struct usb_function *); | |
279 | static void ffs_func_unbind(struct usb_configuration *, | |
280 | struct usb_function *); | |
281 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); | |
282 | static void ffs_func_disable(struct usb_function *); | |
283 | static int ffs_func_setup(struct usb_function *, | |
284 | const struct usb_ctrlrequest *); | |
285 | static void ffs_func_suspend(struct usb_function *); | |
286 | static void ffs_func_resume(struct usb_function *); | |
287 | ||
288 | ||
289 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); | |
290 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); | |
291 | ||
292 | ||
ddf8abd2 MN |
293 | /* The endpoints structures *************************************************/ |
294 | ||
295 | struct ffs_ep { | |
296 | struct usb_ep *ep; /* P: ffs->eps_lock */ | |
297 | struct usb_request *req; /* P: epfile->mutex */ | |
298 | ||
299 | /* [0]: full speed, [1]: high speed */ | |
300 | struct usb_endpoint_descriptor *descs[2]; | |
301 | ||
302 | u8 num; | |
303 | ||
304 | int status; /* P: epfile->mutex */ | |
305 | }; | |
306 | ||
307 | struct ffs_epfile { | |
308 | /* Protects ep->ep and ep->req. */ | |
309 | struct mutex mutex; | |
310 | wait_queue_head_t wait; | |
311 | ||
312 | struct ffs_data *ffs; | |
313 | struct ffs_ep *ep; /* P: ffs->eps_lock */ | |
314 | ||
315 | struct dentry *dentry; | |
316 | ||
317 | char name[5]; | |
318 | ||
319 | unsigned char in; /* P: ffs->eps_lock */ | |
320 | unsigned char isoc; /* P: ffs->eps_lock */ | |
321 | ||
322 | unsigned char _pad; | |
323 | }; | |
324 | ||
ddf8abd2 MN |
325 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
326 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); | |
327 | ||
328 | static struct inode *__must_check | |
329 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, | |
330 | const struct file_operations *fops, | |
331 | struct dentry **dentry_p); | |
332 | ||
333 | ||
334 | /* Misc helper functions ****************************************************/ | |
335 | ||
336 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
337 | __attribute__((warn_unused_result, nonnull)); | |
338 | static char *ffs_prepare_buffer(const char * __user buf, size_t len) | |
339 | __attribute__((warn_unused_result, nonnull)); | |
340 | ||
341 | ||
342 | /* Control file aka ep0 *****************************************************/ | |
343 | ||
344 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
345 | { | |
346 | struct ffs_data *ffs = req->context; | |
347 | ||
348 | complete_all(&ffs->ep0req_completion); | |
349 | } | |
350 | ||
ddf8abd2 MN |
351 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
352 | { | |
353 | struct usb_request *req = ffs->ep0req; | |
354 | int ret; | |
355 | ||
356 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); | |
357 | ||
358 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
359 | ||
360 | req->buf = data; | |
361 | req->length = len; | |
362 | ||
ce1fd358 MS |
363 | /* |
364 | * UDC layer requires to provide a buffer even for ZLP, but should | |
365 | * not use it at all. Let's provide some poisoned pointer to catch | |
366 | * possible bug in the driver. | |
367 | */ | |
368 | if (req->buf == NULL) | |
369 | req->buf = (void *)0xDEADBABE; | |
370 | ||
ddf8abd2 MN |
371 | INIT_COMPLETION(ffs->ep0req_completion); |
372 | ||
373 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); | |
374 | if (unlikely(ret < 0)) | |
375 | return ret; | |
376 | ||
377 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); | |
378 | if (unlikely(ret)) { | |
379 | usb_ep_dequeue(ffs->gadget->ep0, req); | |
380 | return -EINTR; | |
381 | } | |
382 | ||
383 | ffs->setup_state = FFS_NO_SETUP; | |
384 | return ffs->ep0req_status; | |
385 | } | |
386 | ||
387 | static int __ffs_ep0_stall(struct ffs_data *ffs) | |
388 | { | |
389 | if (ffs->ev.can_stall) { | |
aa02f172 | 390 | pr_vdebug("ep0 stall\n"); |
ddf8abd2 MN |
391 | usb_ep_set_halt(ffs->gadget->ep0); |
392 | ffs->setup_state = FFS_NO_SETUP; | |
393 | return -EL2HLT; | |
394 | } else { | |
aa02f172 | 395 | pr_debug("bogus ep0 stall!\n"); |
ddf8abd2 MN |
396 | return -ESRCH; |
397 | } | |
398 | } | |
399 | ||
ddf8abd2 MN |
400 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
401 | size_t len, loff_t *ptr) | |
402 | { | |
403 | struct ffs_data *ffs = file->private_data; | |
404 | ssize_t ret; | |
405 | char *data; | |
406 | ||
407 | ENTER(); | |
408 | ||
409 | /* Fast check if setup was canceled */ | |
410 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) | |
411 | return -EIDRM; | |
412 | ||
413 | /* Acquire mutex */ | |
414 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
415 | if (unlikely(ret < 0)) | |
416 | return ret; | |
417 | ||
ddf8abd2 MN |
418 | /* Check state */ |
419 | switch (ffs->state) { | |
420 | case FFS_READ_DESCRIPTORS: | |
421 | case FFS_READ_STRINGS: | |
422 | /* Copy data */ | |
423 | if (unlikely(len < 16)) { | |
424 | ret = -EINVAL; | |
425 | break; | |
426 | } | |
427 | ||
428 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 429 | if (IS_ERR(data)) { |
ddf8abd2 MN |
430 | ret = PTR_ERR(data); |
431 | break; | |
432 | } | |
433 | ||
434 | /* Handle data */ | |
435 | if (ffs->state == FFS_READ_DESCRIPTORS) { | |
aa02f172 | 436 | pr_info("read descriptors\n"); |
ddf8abd2 MN |
437 | ret = __ffs_data_got_descs(ffs, data, len); |
438 | if (unlikely(ret < 0)) | |
439 | break; | |
440 | ||
441 | ffs->state = FFS_READ_STRINGS; | |
442 | ret = len; | |
443 | } else { | |
aa02f172 | 444 | pr_info("read strings\n"); |
ddf8abd2 MN |
445 | ret = __ffs_data_got_strings(ffs, data, len); |
446 | if (unlikely(ret < 0)) | |
447 | break; | |
448 | ||
449 | ret = ffs_epfiles_create(ffs); | |
450 | if (unlikely(ret)) { | |
451 | ffs->state = FFS_CLOSING; | |
452 | break; | |
453 | } | |
454 | ||
455 | ffs->state = FFS_ACTIVE; | |
456 | mutex_unlock(&ffs->mutex); | |
457 | ||
458 | ret = functionfs_ready_callback(ffs); | |
459 | if (unlikely(ret < 0)) { | |
460 | ffs->state = FFS_CLOSING; | |
461 | return ret; | |
462 | } | |
463 | ||
464 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); | |
465 | return len; | |
466 | } | |
467 | break; | |
468 | ||
ddf8abd2 MN |
469 | case FFS_ACTIVE: |
470 | data = NULL; | |
5ab54cf7 MN |
471 | /* |
472 | * We're called from user space, we can use _irq | |
473 | * rather then _irqsave | |
474 | */ | |
ddf8abd2 MN |
475 | spin_lock_irq(&ffs->ev.waitq.lock); |
476 | switch (FFS_SETUP_STATE(ffs)) { | |
477 | case FFS_SETUP_CANCELED: | |
478 | ret = -EIDRM; | |
479 | goto done_spin; | |
480 | ||
481 | case FFS_NO_SETUP: | |
482 | ret = -ESRCH; | |
483 | goto done_spin; | |
484 | ||
485 | case FFS_SETUP_PENDING: | |
486 | break; | |
487 | } | |
488 | ||
489 | /* FFS_SETUP_PENDING */ | |
490 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { | |
491 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
492 | ret = __ffs_ep0_stall(ffs); | |
493 | break; | |
494 | } | |
495 | ||
496 | /* FFS_SETUP_PENDING and not stall */ | |
497 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
498 | ||
499 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
500 | ||
501 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 502 | if (IS_ERR(data)) { |
ddf8abd2 MN |
503 | ret = PTR_ERR(data); |
504 | break; | |
505 | } | |
506 | ||
507 | spin_lock_irq(&ffs->ev.waitq.lock); | |
508 | ||
5ab54cf7 MN |
509 | /* |
510 | * We are guaranteed to be still in FFS_ACTIVE state | |
ddf8abd2 MN |
511 | * but the state of setup could have changed from |
512 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELED so we need | |
513 | * to check for that. If that happened we copied data | |
5ab54cf7 MN |
514 | * from user space in vain but it's unlikely. |
515 | * | |
516 | * For sure we are not in FFS_NO_SETUP since this is | |
ddf8abd2 MN |
517 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
518 | * transition can be performed and it's protected by | |
5ab54cf7 MN |
519 | * mutex. |
520 | */ | |
ddf8abd2 MN |
521 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) { |
522 | ret = -EIDRM; | |
523 | done_spin: | |
524 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
525 | } else { | |
526 | /* unlocks spinlock */ | |
527 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
528 | } | |
529 | kfree(data); | |
530 | break; | |
531 | ||
ddf8abd2 MN |
532 | default: |
533 | ret = -EBADFD; | |
534 | break; | |
535 | } | |
536 | ||
ddf8abd2 MN |
537 | mutex_unlock(&ffs->mutex); |
538 | return ret; | |
539 | } | |
540 | ||
ddf8abd2 MN |
541 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, |
542 | size_t n) | |
543 | { | |
5ab54cf7 MN |
544 | /* |
545 | * We are holding ffs->ev.waitq.lock and ffs->mutex and we need | |
546 | * to release them. | |
547 | */ | |
ddf8abd2 MN |
548 | struct usb_functionfs_event events[n]; |
549 | unsigned i = 0; | |
550 | ||
551 | memset(events, 0, sizeof events); | |
552 | ||
553 | do { | |
554 | events[i].type = ffs->ev.types[i]; | |
555 | if (events[i].type == FUNCTIONFS_SETUP) { | |
556 | events[i].u.setup = ffs->ev.setup; | |
557 | ffs->setup_state = FFS_SETUP_PENDING; | |
558 | } | |
559 | } while (++i < n); | |
560 | ||
561 | if (n < ffs->ev.count) { | |
562 | ffs->ev.count -= n; | |
563 | memmove(ffs->ev.types, ffs->ev.types + n, | |
564 | ffs->ev.count * sizeof *ffs->ev.types); | |
565 | } else { | |
566 | ffs->ev.count = 0; | |
567 | } | |
568 | ||
569 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
570 | mutex_unlock(&ffs->mutex); | |
571 | ||
572 | return unlikely(__copy_to_user(buf, events, sizeof events)) | |
573 | ? -EFAULT : sizeof events; | |
574 | } | |
575 | ||
ddf8abd2 MN |
576 | static ssize_t ffs_ep0_read(struct file *file, char __user *buf, |
577 | size_t len, loff_t *ptr) | |
578 | { | |
579 | struct ffs_data *ffs = file->private_data; | |
580 | char *data = NULL; | |
581 | size_t n; | |
582 | int ret; | |
583 | ||
584 | ENTER(); | |
585 | ||
586 | /* Fast check if setup was canceled */ | |
587 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) | |
588 | return -EIDRM; | |
589 | ||
590 | /* Acquire mutex */ | |
591 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
592 | if (unlikely(ret < 0)) | |
593 | return ret; | |
594 | ||
ddf8abd2 MN |
595 | /* Check state */ |
596 | if (ffs->state != FFS_ACTIVE) { | |
597 | ret = -EBADFD; | |
598 | goto done_mutex; | |
599 | } | |
600 | ||
5ab54cf7 MN |
601 | /* |
602 | * We're called from user space, we can use _irq rather then | |
603 | * _irqsave | |
604 | */ | |
ddf8abd2 MN |
605 | spin_lock_irq(&ffs->ev.waitq.lock); |
606 | ||
607 | switch (FFS_SETUP_STATE(ffs)) { | |
608 | case FFS_SETUP_CANCELED: | |
609 | ret = -EIDRM; | |
610 | break; | |
611 | ||
612 | case FFS_NO_SETUP: | |
613 | n = len / sizeof(struct usb_functionfs_event); | |
614 | if (unlikely(!n)) { | |
615 | ret = -EINVAL; | |
616 | break; | |
617 | } | |
618 | ||
619 | if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { | |
620 | ret = -EAGAIN; | |
621 | break; | |
622 | } | |
623 | ||
5ab54cf7 MN |
624 | if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, |
625 | ffs->ev.count)) { | |
ddf8abd2 MN |
626 | ret = -EINTR; |
627 | break; | |
628 | } | |
629 | ||
630 | return __ffs_ep0_read_events(ffs, buf, | |
631 | min(n, (size_t)ffs->ev.count)); | |
632 | ||
ddf8abd2 MN |
633 | case FFS_SETUP_PENDING: |
634 | if (ffs->ev.setup.bRequestType & USB_DIR_IN) { | |
635 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
636 | ret = __ffs_ep0_stall(ffs); | |
637 | goto done_mutex; | |
638 | } | |
639 | ||
640 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
641 | ||
642 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
643 | ||
644 | if (likely(len)) { | |
645 | data = kmalloc(len, GFP_KERNEL); | |
646 | if (unlikely(!data)) { | |
647 | ret = -ENOMEM; | |
648 | goto done_mutex; | |
649 | } | |
650 | } | |
651 | ||
652 | spin_lock_irq(&ffs->ev.waitq.lock); | |
653 | ||
654 | /* See ffs_ep0_write() */ | |
655 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) { | |
656 | ret = -EIDRM; | |
657 | break; | |
658 | } | |
659 | ||
660 | /* unlocks spinlock */ | |
661 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
662 | if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len))) | |
663 | ret = -EFAULT; | |
664 | goto done_mutex; | |
665 | ||
666 | default: | |
667 | ret = -EBADFD; | |
668 | break; | |
669 | } | |
670 | ||
671 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
672 | done_mutex: | |
673 | mutex_unlock(&ffs->mutex); | |
674 | kfree(data); | |
675 | return ret; | |
676 | } | |
677 | ||
ddf8abd2 MN |
678 | static int ffs_ep0_open(struct inode *inode, struct file *file) |
679 | { | |
680 | struct ffs_data *ffs = inode->i_private; | |
681 | ||
682 | ENTER(); | |
683 | ||
684 | if (unlikely(ffs->state == FFS_CLOSING)) | |
685 | return -EBUSY; | |
686 | ||
687 | file->private_data = ffs; | |
688 | ffs_data_opened(ffs); | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
ddf8abd2 MN |
693 | static int ffs_ep0_release(struct inode *inode, struct file *file) |
694 | { | |
695 | struct ffs_data *ffs = file->private_data; | |
696 | ||
697 | ENTER(); | |
698 | ||
699 | ffs_data_closed(ffs); | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
ddf8abd2 MN |
704 | static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) |
705 | { | |
706 | struct ffs_data *ffs = file->private_data; | |
707 | struct usb_gadget *gadget = ffs->gadget; | |
708 | long ret; | |
709 | ||
710 | ENTER(); | |
711 | ||
712 | if (code == FUNCTIONFS_INTERFACE_REVMAP) { | |
713 | struct ffs_function *func = ffs->func; | |
714 | ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; | |
715 | } else if (gadget->ops->ioctl) { | |
ddf8abd2 | 716 | ret = gadget->ops->ioctl(gadget, code, value); |
ddf8abd2 MN |
717 | } else { |
718 | ret = -ENOTTY; | |
719 | } | |
720 | ||
721 | return ret; | |
722 | } | |
723 | ||
ddf8abd2 MN |
724 | static const struct file_operations ffs_ep0_operations = { |
725 | .owner = THIS_MODULE, | |
726 | .llseek = no_llseek, | |
727 | ||
728 | .open = ffs_ep0_open, | |
729 | .write = ffs_ep0_write, | |
730 | .read = ffs_ep0_read, | |
731 | .release = ffs_ep0_release, | |
732 | .unlocked_ioctl = ffs_ep0_ioctl, | |
733 | }; | |
734 | ||
735 | ||
736 | /* "Normal" endpoints operations ********************************************/ | |
737 | ||
ddf8abd2 MN |
738 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) |
739 | { | |
740 | ENTER(); | |
741 | if (likely(req->context)) { | |
742 | struct ffs_ep *ep = _ep->driver_data; | |
743 | ep->status = req->status ? req->status : req->actual; | |
744 | complete(req->context); | |
745 | } | |
746 | } | |
747 | ||
ddf8abd2 MN |
748 | static ssize_t ffs_epfile_io(struct file *file, |
749 | char __user *buf, size_t len, int read) | |
750 | { | |
751 | struct ffs_epfile *epfile = file->private_data; | |
752 | struct ffs_ep *ep; | |
753 | char *data = NULL; | |
754 | ssize_t ret; | |
755 | int halt; | |
756 | ||
757 | goto first_try; | |
758 | do { | |
759 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
760 | mutex_unlock(&epfile->mutex); | |
761 | ||
762 | first_try: | |
763 | /* Are we still active? */ | |
764 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) { | |
765 | ret = -ENODEV; | |
766 | goto error; | |
767 | } | |
768 | ||
769 | /* Wait for endpoint to be enabled */ | |
770 | ep = epfile->ep; | |
771 | if (!ep) { | |
772 | if (file->f_flags & O_NONBLOCK) { | |
773 | ret = -EAGAIN; | |
774 | goto error; | |
775 | } | |
776 | ||
5ab54cf7 MN |
777 | if (wait_event_interruptible(epfile->wait, |
778 | (ep = epfile->ep))) { | |
ddf8abd2 MN |
779 | ret = -EINTR; |
780 | goto error; | |
781 | } | |
782 | } | |
783 | ||
784 | /* Do we halt? */ | |
785 | halt = !read == !epfile->in; | |
786 | if (halt && epfile->isoc) { | |
787 | ret = -EINVAL; | |
788 | goto error; | |
789 | } | |
790 | ||
791 | /* Allocate & copy */ | |
792 | if (!halt && !data) { | |
793 | data = kzalloc(len, GFP_KERNEL); | |
794 | if (unlikely(!data)) | |
795 | return -ENOMEM; | |
796 | ||
797 | if (!read && | |
798 | unlikely(__copy_from_user(data, buf, len))) { | |
799 | ret = -EFAULT; | |
800 | goto error; | |
801 | } | |
802 | } | |
803 | ||
804 | /* We will be using request */ | |
805 | ret = ffs_mutex_lock(&epfile->mutex, | |
806 | file->f_flags & O_NONBLOCK); | |
807 | if (unlikely(ret)) | |
808 | goto error; | |
809 | ||
5ab54cf7 MN |
810 | /* |
811 | * We're called from user space, we can use _irq rather then | |
812 | * _irqsave | |
813 | */ | |
ddf8abd2 MN |
814 | spin_lock_irq(&epfile->ffs->eps_lock); |
815 | ||
5ab54cf7 MN |
816 | /* |
817 | * While we were acquiring mutex endpoint got disabled | |
818 | * or changed? | |
819 | */ | |
ddf8abd2 MN |
820 | } while (unlikely(epfile->ep != ep)); |
821 | ||
822 | /* Halt */ | |
823 | if (unlikely(halt)) { | |
824 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) | |
825 | usb_ep_set_halt(ep->ep); | |
826 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
827 | ret = -EBADMSG; | |
828 | } else { | |
829 | /* Fire the request */ | |
830 | DECLARE_COMPLETION_ONSTACK(done); | |
831 | ||
832 | struct usb_request *req = ep->req; | |
833 | req->context = &done; | |
834 | req->complete = ffs_epfile_io_complete; | |
835 | req->buf = data; | |
836 | req->length = len; | |
837 | ||
838 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); | |
839 | ||
840 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
841 | ||
842 | if (unlikely(ret < 0)) { | |
843 | /* nop */ | |
844 | } else if (unlikely(wait_for_completion_interruptible(&done))) { | |
845 | ret = -EINTR; | |
846 | usb_ep_dequeue(ep->ep, req); | |
847 | } else { | |
848 | ret = ep->status; | |
849 | if (read && ret > 0 && | |
850 | unlikely(copy_to_user(buf, data, ret))) | |
851 | ret = -EFAULT; | |
852 | } | |
853 | } | |
854 | ||
855 | mutex_unlock(&epfile->mutex); | |
856 | error: | |
857 | kfree(data); | |
858 | return ret; | |
859 | } | |
860 | ||
ddf8abd2 MN |
861 | static ssize_t |
862 | ffs_epfile_write(struct file *file, const char __user *buf, size_t len, | |
863 | loff_t *ptr) | |
864 | { | |
865 | ENTER(); | |
866 | ||
867 | return ffs_epfile_io(file, (char __user *)buf, len, 0); | |
868 | } | |
869 | ||
870 | static ssize_t | |
871 | ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr) | |
872 | { | |
873 | ENTER(); | |
874 | ||
875 | return ffs_epfile_io(file, buf, len, 1); | |
876 | } | |
877 | ||
878 | static int | |
879 | ffs_epfile_open(struct inode *inode, struct file *file) | |
880 | { | |
881 | struct ffs_epfile *epfile = inode->i_private; | |
882 | ||
883 | ENTER(); | |
884 | ||
885 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
886 | return -ENODEV; | |
887 | ||
888 | file->private_data = epfile; | |
889 | ffs_data_opened(epfile->ffs); | |
890 | ||
891 | return 0; | |
892 | } | |
893 | ||
894 | static int | |
895 | ffs_epfile_release(struct inode *inode, struct file *file) | |
896 | { | |
897 | struct ffs_epfile *epfile = inode->i_private; | |
898 | ||
899 | ENTER(); | |
900 | ||
901 | ffs_data_closed(epfile->ffs); | |
902 | ||
903 | return 0; | |
904 | } | |
905 | ||
ddf8abd2 MN |
906 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
907 | unsigned long value) | |
908 | { | |
909 | struct ffs_epfile *epfile = file->private_data; | |
910 | int ret; | |
911 | ||
912 | ENTER(); | |
913 | ||
914 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
915 | return -ENODEV; | |
916 | ||
917 | spin_lock_irq(&epfile->ffs->eps_lock); | |
918 | if (likely(epfile->ep)) { | |
919 | switch (code) { | |
920 | case FUNCTIONFS_FIFO_STATUS: | |
921 | ret = usb_ep_fifo_status(epfile->ep->ep); | |
922 | break; | |
923 | case FUNCTIONFS_FIFO_FLUSH: | |
924 | usb_ep_fifo_flush(epfile->ep->ep); | |
925 | ret = 0; | |
926 | break; | |
927 | case FUNCTIONFS_CLEAR_HALT: | |
928 | ret = usb_ep_clear_halt(epfile->ep->ep); | |
929 | break; | |
930 | case FUNCTIONFS_ENDPOINT_REVMAP: | |
931 | ret = epfile->ep->num; | |
932 | break; | |
933 | default: | |
934 | ret = -ENOTTY; | |
935 | } | |
936 | } else { | |
937 | ret = -ENODEV; | |
938 | } | |
939 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
940 | ||
941 | return ret; | |
942 | } | |
943 | ||
ddf8abd2 MN |
944 | static const struct file_operations ffs_epfile_operations = { |
945 | .owner = THIS_MODULE, | |
946 | .llseek = no_llseek, | |
947 | ||
948 | .open = ffs_epfile_open, | |
949 | .write = ffs_epfile_write, | |
950 | .read = ffs_epfile_read, | |
951 | .release = ffs_epfile_release, | |
952 | .unlocked_ioctl = ffs_epfile_ioctl, | |
953 | }; | |
954 | ||
955 | ||
ddf8abd2 MN |
956 | /* File system and super block operations ***********************************/ |
957 | ||
958 | /* | |
5ab54cf7 | 959 | * Mounting the file system creates a controller file, used first for |
ddf8abd2 MN |
960 | * function configuration then later for event monitoring. |
961 | */ | |
962 | ||
ddf8abd2 MN |
963 | static struct inode *__must_check |
964 | ffs_sb_make_inode(struct super_block *sb, void *data, | |
965 | const struct file_operations *fops, | |
966 | const struct inode_operations *iops, | |
967 | struct ffs_file_perms *perms) | |
968 | { | |
969 | struct inode *inode; | |
970 | ||
971 | ENTER(); | |
972 | ||
973 | inode = new_inode(sb); | |
974 | ||
975 | if (likely(inode)) { | |
976 | struct timespec current_time = CURRENT_TIME; | |
977 | ||
12ba8d1e | 978 | inode->i_ino = get_next_ino(); |
ddf8abd2 MN |
979 | inode->i_mode = perms->mode; |
980 | inode->i_uid = perms->uid; | |
981 | inode->i_gid = perms->gid; | |
982 | inode->i_atime = current_time; | |
983 | inode->i_mtime = current_time; | |
984 | inode->i_ctime = current_time; | |
985 | inode->i_private = data; | |
986 | if (fops) | |
987 | inode->i_fop = fops; | |
988 | if (iops) | |
989 | inode->i_op = iops; | |
990 | } | |
991 | ||
992 | return inode; | |
993 | } | |
994 | ||
ddf8abd2 | 995 | /* Create "regular" file */ |
ddf8abd2 MN |
996 | static struct inode *ffs_sb_create_file(struct super_block *sb, |
997 | const char *name, void *data, | |
998 | const struct file_operations *fops, | |
999 | struct dentry **dentry_p) | |
1000 | { | |
1001 | struct ffs_data *ffs = sb->s_fs_info; | |
1002 | struct dentry *dentry; | |
1003 | struct inode *inode; | |
1004 | ||
1005 | ENTER(); | |
1006 | ||
1007 | dentry = d_alloc_name(sb->s_root, name); | |
1008 | if (unlikely(!dentry)) | |
1009 | return NULL; | |
1010 | ||
1011 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); | |
1012 | if (unlikely(!inode)) { | |
1013 | dput(dentry); | |
1014 | return NULL; | |
1015 | } | |
1016 | ||
1017 | d_add(dentry, inode); | |
1018 | if (dentry_p) | |
1019 | *dentry_p = dentry; | |
1020 | ||
1021 | return inode; | |
1022 | } | |
1023 | ||
ddf8abd2 | 1024 | /* Super block */ |
ddf8abd2 MN |
1025 | static const struct super_operations ffs_sb_operations = { |
1026 | .statfs = simple_statfs, | |
1027 | .drop_inode = generic_delete_inode, | |
1028 | }; | |
1029 | ||
1030 | struct ffs_sb_fill_data { | |
1031 | struct ffs_file_perms perms; | |
1032 | umode_t root_mode; | |
1033 | const char *dev_name; | |
1034 | }; | |
1035 | ||
1036 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) | |
1037 | { | |
1038 | struct ffs_sb_fill_data *data = _data; | |
1039 | struct inode *inode; | |
1040 | struct dentry *d; | |
1041 | struct ffs_data *ffs; | |
1042 | ||
1043 | ENTER(); | |
1044 | ||
5ab54cf7 | 1045 | /* Initialise data */ |
ddf8abd2 MN |
1046 | ffs = ffs_data_new(); |
1047 | if (unlikely(!ffs)) | |
1048 | goto enomem0; | |
1049 | ||
1050 | ffs->sb = sb; | |
1051 | ffs->dev_name = data->dev_name; | |
1052 | ffs->file_perms = data->perms; | |
1053 | ||
1054 | sb->s_fs_info = ffs; | |
1055 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1056 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1057 | sb->s_magic = FUNCTIONFS_MAGIC; | |
1058 | sb->s_op = &ffs_sb_operations; | |
1059 | sb->s_time_gran = 1; | |
1060 | ||
1061 | /* Root inode */ | |
1062 | data->perms.mode = data->root_mode; | |
1063 | inode = ffs_sb_make_inode(sb, NULL, | |
1064 | &simple_dir_operations, | |
1065 | &simple_dir_inode_operations, | |
1066 | &data->perms); | |
1067 | if (unlikely(!inode)) | |
1068 | goto enomem1; | |
1069 | d = d_alloc_root(inode); | |
1070 | if (unlikely(!d)) | |
1071 | goto enomem2; | |
1072 | sb->s_root = d; | |
1073 | ||
1074 | /* EP0 file */ | |
1075 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, | |
1076 | &ffs_ep0_operations, NULL))) | |
1077 | goto enomem3; | |
1078 | ||
1079 | return 0; | |
1080 | ||
1081 | enomem3: | |
1082 | dput(d); | |
1083 | enomem2: | |
1084 | iput(inode); | |
1085 | enomem1: | |
1086 | ffs_data_put(ffs); | |
1087 | enomem0: | |
1088 | return -ENOMEM; | |
1089 | } | |
1090 | ||
ddf8abd2 MN |
1091 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
1092 | { | |
1093 | ENTER(); | |
1094 | ||
1095 | if (!opts || !*opts) | |
1096 | return 0; | |
1097 | ||
1098 | for (;;) { | |
1099 | char *end, *eq, *comma; | |
1100 | unsigned long value; | |
1101 | ||
1102 | /* Option limit */ | |
1103 | comma = strchr(opts, ','); | |
1104 | if (comma) | |
1105 | *comma = 0; | |
1106 | ||
1107 | /* Value limit */ | |
1108 | eq = strchr(opts, '='); | |
1109 | if (unlikely(!eq)) { | |
aa02f172 | 1110 | pr_err("'=' missing in %s\n", opts); |
ddf8abd2 MN |
1111 | return -EINVAL; |
1112 | } | |
1113 | *eq = 0; | |
1114 | ||
1115 | /* Parse value */ | |
1116 | value = simple_strtoul(eq + 1, &end, 0); | |
1117 | if (unlikely(*end != ',' && *end != 0)) { | |
aa02f172 | 1118 | pr_err("%s: invalid value: %s\n", opts, eq + 1); |
ddf8abd2 MN |
1119 | return -EINVAL; |
1120 | } | |
1121 | ||
1122 | /* Interpret option */ | |
1123 | switch (eq - opts) { | |
1124 | case 5: | |
1125 | if (!memcmp(opts, "rmode", 5)) | |
1126 | data->root_mode = (value & 0555) | S_IFDIR; | |
1127 | else if (!memcmp(opts, "fmode", 5)) | |
1128 | data->perms.mode = (value & 0666) | S_IFREG; | |
1129 | else | |
1130 | goto invalid; | |
1131 | break; | |
1132 | ||
1133 | case 4: | |
1134 | if (!memcmp(opts, "mode", 4)) { | |
1135 | data->root_mode = (value & 0555) | S_IFDIR; | |
1136 | data->perms.mode = (value & 0666) | S_IFREG; | |
1137 | } else { | |
1138 | goto invalid; | |
1139 | } | |
1140 | break; | |
1141 | ||
1142 | case 3: | |
1143 | if (!memcmp(opts, "uid", 3)) | |
1144 | data->perms.uid = value; | |
1145 | else if (!memcmp(opts, "gid", 3)) | |
1146 | data->perms.gid = value; | |
1147 | else | |
1148 | goto invalid; | |
1149 | break; | |
1150 | ||
1151 | default: | |
1152 | invalid: | |
aa02f172 | 1153 | pr_err("%s: invalid option\n", opts); |
ddf8abd2 MN |
1154 | return -EINVAL; |
1155 | } | |
1156 | ||
1157 | /* Next iteration */ | |
1158 | if (!comma) | |
1159 | break; | |
1160 | opts = comma + 1; | |
1161 | } | |
1162 | ||
1163 | return 0; | |
1164 | } | |
1165 | ||
ddf8abd2 MN |
1166 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
1167 | ||
fc14f2fe AV |
1168 | static struct dentry * |
1169 | ffs_fs_mount(struct file_system_type *t, int flags, | |
1170 | const char *dev_name, void *opts) | |
ddf8abd2 MN |
1171 | { |
1172 | struct ffs_sb_fill_data data = { | |
1173 | .perms = { | |
1174 | .mode = S_IFREG | 0600, | |
1175 | .uid = 0, | |
1176 | .gid = 0 | |
1177 | }, | |
1178 | .root_mode = S_IFDIR | 0500, | |
1179 | }; | |
1180 | int ret; | |
1181 | ||
1182 | ENTER(); | |
1183 | ||
1184 | ret = functionfs_check_dev_callback(dev_name); | |
1185 | if (unlikely(ret < 0)) | |
fc14f2fe | 1186 | return ERR_PTR(ret); |
ddf8abd2 MN |
1187 | |
1188 | ret = ffs_fs_parse_opts(&data, opts); | |
1189 | if (unlikely(ret < 0)) | |
fc14f2fe | 1190 | return ERR_PTR(ret); |
ddf8abd2 MN |
1191 | |
1192 | data.dev_name = dev_name; | |
fc14f2fe | 1193 | return mount_single(t, flags, &data, ffs_sb_fill); |
ddf8abd2 MN |
1194 | } |
1195 | ||
1196 | static void | |
1197 | ffs_fs_kill_sb(struct super_block *sb) | |
1198 | { | |
1199 | void *ptr; | |
1200 | ||
1201 | ENTER(); | |
1202 | ||
1203 | kill_litter_super(sb); | |
1204 | ptr = xchg(&sb->s_fs_info, NULL); | |
1205 | if (ptr) | |
1206 | ffs_data_put(ptr); | |
1207 | } | |
1208 | ||
1209 | static struct file_system_type ffs_fs_type = { | |
1210 | .owner = THIS_MODULE, | |
1211 | .name = "functionfs", | |
fc14f2fe | 1212 | .mount = ffs_fs_mount, |
ddf8abd2 MN |
1213 | .kill_sb = ffs_fs_kill_sb, |
1214 | }; | |
1215 | ||
1216 | ||
ddf8abd2 MN |
1217 | /* Driver's main init/cleanup functions *************************************/ |
1218 | ||
ddf8abd2 MN |
1219 | static int functionfs_init(void) |
1220 | { | |
1221 | int ret; | |
1222 | ||
1223 | ENTER(); | |
1224 | ||
1225 | ret = register_filesystem(&ffs_fs_type); | |
1226 | if (likely(!ret)) | |
aa02f172 | 1227 | pr_info("file system registered\n"); |
ddf8abd2 | 1228 | else |
aa02f172 | 1229 | pr_err("failed registering file system (%d)\n", ret); |
ddf8abd2 MN |
1230 | |
1231 | return ret; | |
1232 | } | |
1233 | ||
1234 | static void functionfs_cleanup(void) | |
1235 | { | |
1236 | ENTER(); | |
1237 | ||
aa02f172 | 1238 | pr_info("unloading\n"); |
ddf8abd2 MN |
1239 | unregister_filesystem(&ffs_fs_type); |
1240 | } | |
1241 | ||
1242 | ||
ddf8abd2 MN |
1243 | /* ffs_data and ffs_function construction and destruction code **************/ |
1244 | ||
1245 | static void ffs_data_clear(struct ffs_data *ffs); | |
1246 | static void ffs_data_reset(struct ffs_data *ffs); | |
1247 | ||
ddf8abd2 MN |
1248 | static void ffs_data_get(struct ffs_data *ffs) |
1249 | { | |
1250 | ENTER(); | |
1251 | ||
1252 | atomic_inc(&ffs->ref); | |
1253 | } | |
1254 | ||
1255 | static void ffs_data_opened(struct ffs_data *ffs) | |
1256 | { | |
1257 | ENTER(); | |
1258 | ||
1259 | atomic_inc(&ffs->ref); | |
1260 | atomic_inc(&ffs->opened); | |
1261 | } | |
1262 | ||
1263 | static void ffs_data_put(struct ffs_data *ffs) | |
1264 | { | |
1265 | ENTER(); | |
1266 | ||
1267 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { | |
aa02f172 | 1268 | pr_info("%s(): freeing\n", __func__); |
ddf8abd2 MN |
1269 | ffs_data_clear(ffs); |
1270 | BUG_ON(mutex_is_locked(&ffs->mutex) || | |
1271 | spin_is_locked(&ffs->ev.waitq.lock) || | |
1272 | waitqueue_active(&ffs->ev.waitq) || | |
1273 | waitqueue_active(&ffs->ep0req_completion.wait)); | |
1274 | kfree(ffs); | |
1275 | } | |
1276 | } | |
1277 | ||
ddf8abd2 MN |
1278 | static void ffs_data_closed(struct ffs_data *ffs) |
1279 | { | |
1280 | ENTER(); | |
1281 | ||
1282 | if (atomic_dec_and_test(&ffs->opened)) { | |
1283 | ffs->state = FFS_CLOSING; | |
1284 | ffs_data_reset(ffs); | |
1285 | } | |
1286 | ||
1287 | ffs_data_put(ffs); | |
1288 | } | |
1289 | ||
ddf8abd2 MN |
1290 | static struct ffs_data *ffs_data_new(void) |
1291 | { | |
1292 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); | |
1293 | if (unlikely(!ffs)) | |
1294 | return 0; | |
1295 | ||
1296 | ENTER(); | |
1297 | ||
1298 | atomic_set(&ffs->ref, 1); | |
1299 | atomic_set(&ffs->opened, 0); | |
1300 | ffs->state = FFS_READ_DESCRIPTORS; | |
1301 | mutex_init(&ffs->mutex); | |
1302 | spin_lock_init(&ffs->eps_lock); | |
1303 | init_waitqueue_head(&ffs->ev.waitq); | |
1304 | init_completion(&ffs->ep0req_completion); | |
1305 | ||
1306 | /* XXX REVISIT need to update it in some places, or do we? */ | |
1307 | ffs->ev.can_stall = 1; | |
1308 | ||
1309 | return ffs; | |
1310 | } | |
1311 | ||
ddf8abd2 MN |
1312 | static void ffs_data_clear(struct ffs_data *ffs) |
1313 | { | |
1314 | ENTER(); | |
1315 | ||
1316 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags)) | |
1317 | functionfs_closed_callback(ffs); | |
1318 | ||
1319 | BUG_ON(ffs->gadget); | |
1320 | ||
1321 | if (ffs->epfiles) | |
1322 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); | |
1323 | ||
1324 | kfree(ffs->raw_descs); | |
1325 | kfree(ffs->raw_strings); | |
1326 | kfree(ffs->stringtabs); | |
1327 | } | |
1328 | ||
ddf8abd2 MN |
1329 | static void ffs_data_reset(struct ffs_data *ffs) |
1330 | { | |
1331 | ENTER(); | |
1332 | ||
1333 | ffs_data_clear(ffs); | |
1334 | ||
1335 | ffs->epfiles = NULL; | |
1336 | ffs->raw_descs = NULL; | |
1337 | ffs->raw_strings = NULL; | |
1338 | ffs->stringtabs = NULL; | |
1339 | ||
1340 | ffs->raw_descs_length = 0; | |
1341 | ffs->raw_fs_descs_length = 0; | |
1342 | ffs->fs_descs_count = 0; | |
1343 | ffs->hs_descs_count = 0; | |
1344 | ||
1345 | ffs->strings_count = 0; | |
1346 | ffs->interfaces_count = 0; | |
1347 | ffs->eps_count = 0; | |
1348 | ||
1349 | ffs->ev.count = 0; | |
1350 | ||
1351 | ffs->state = FFS_READ_DESCRIPTORS; | |
1352 | ffs->setup_state = FFS_NO_SETUP; | |
1353 | ffs->flags = 0; | |
1354 | } | |
1355 | ||
1356 | ||
1357 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) | |
1358 | { | |
fd7c9a00 MN |
1359 | struct usb_gadget_strings **lang; |
1360 | int first_id; | |
ddf8abd2 MN |
1361 | |
1362 | ENTER(); | |
1363 | ||
1364 | if (WARN_ON(ffs->state != FFS_ACTIVE | |
1365 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) | |
1366 | return -EBADFD; | |
1367 | ||
fd7c9a00 MN |
1368 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
1369 | if (unlikely(first_id < 0)) | |
1370 | return first_id; | |
ddf8abd2 MN |
1371 | |
1372 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); | |
1373 | if (unlikely(!ffs->ep0req)) | |
1374 | return -ENOMEM; | |
1375 | ffs->ep0req->complete = ffs_ep0_complete; | |
1376 | ffs->ep0req->context = ffs; | |
1377 | ||
fd7c9a00 MN |
1378 | lang = ffs->stringtabs; |
1379 | for (lang = ffs->stringtabs; *lang; ++lang) { | |
1380 | struct usb_string *str = (*lang)->strings; | |
1381 | int id = first_id; | |
1382 | for (; str->s; ++id, ++str) | |
1383 | str->id = id; | |
ddf8abd2 MN |
1384 | } |
1385 | ||
1386 | ffs->gadget = cdev->gadget; | |
fd7c9a00 | 1387 | ffs_data_get(ffs); |
ddf8abd2 MN |
1388 | return 0; |
1389 | } | |
1390 | ||
ddf8abd2 MN |
1391 | static void functionfs_unbind(struct ffs_data *ffs) |
1392 | { | |
1393 | ENTER(); | |
1394 | ||
1395 | if (!WARN_ON(!ffs->gadget)) { | |
1396 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); | |
1397 | ffs->ep0req = NULL; | |
1398 | ffs->gadget = NULL; | |
1399 | ffs_data_put(ffs); | |
1400 | } | |
1401 | } | |
1402 | ||
ddf8abd2 MN |
1403 | static int ffs_epfiles_create(struct ffs_data *ffs) |
1404 | { | |
1405 | struct ffs_epfile *epfile, *epfiles; | |
1406 | unsigned i, count; | |
1407 | ||
1408 | ENTER(); | |
1409 | ||
1410 | count = ffs->eps_count; | |
1411 | epfiles = kzalloc(count * sizeof *epfiles, GFP_KERNEL); | |
1412 | if (!epfiles) | |
1413 | return -ENOMEM; | |
1414 | ||
1415 | epfile = epfiles; | |
1416 | for (i = 1; i <= count; ++i, ++epfile) { | |
1417 | epfile->ffs = ffs; | |
1418 | mutex_init(&epfile->mutex); | |
1419 | init_waitqueue_head(&epfile->wait); | |
1420 | sprintf(epfiles->name, "ep%u", i); | |
1421 | if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile, | |
1422 | &ffs_epfile_operations, | |
1423 | &epfile->dentry))) { | |
1424 | ffs_epfiles_destroy(epfiles, i - 1); | |
1425 | return -ENOMEM; | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | ffs->epfiles = epfiles; | |
1430 | return 0; | |
1431 | } | |
1432 | ||
ddf8abd2 MN |
1433 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
1434 | { | |
1435 | struct ffs_epfile *epfile = epfiles; | |
1436 | ||
1437 | ENTER(); | |
1438 | ||
1439 | for (; count; --count, ++epfile) { | |
1440 | BUG_ON(mutex_is_locked(&epfile->mutex) || | |
1441 | waitqueue_active(&epfile->wait)); | |
1442 | if (epfile->dentry) { | |
1443 | d_delete(epfile->dentry); | |
1444 | dput(epfile->dentry); | |
1445 | epfile->dentry = NULL; | |
1446 | } | |
1447 | } | |
1448 | ||
1449 | kfree(epfiles); | |
1450 | } | |
1451 | ||
7898aee1 MN |
1452 | static int functionfs_bind_config(struct usb_composite_dev *cdev, |
1453 | struct usb_configuration *c, | |
1454 | struct ffs_data *ffs) | |
ddf8abd2 MN |
1455 | { |
1456 | struct ffs_function *func; | |
1457 | int ret; | |
1458 | ||
1459 | ENTER(); | |
1460 | ||
1461 | func = kzalloc(sizeof *func, GFP_KERNEL); | |
1462 | if (unlikely(!func)) | |
1463 | return -ENOMEM; | |
1464 | ||
1465 | func->function.name = "Function FS Gadget"; | |
1466 | func->function.strings = ffs->stringtabs; | |
1467 | ||
1468 | func->function.bind = ffs_func_bind; | |
1469 | func->function.unbind = ffs_func_unbind; | |
1470 | func->function.set_alt = ffs_func_set_alt; | |
ddf8abd2 MN |
1471 | func->function.disable = ffs_func_disable; |
1472 | func->function.setup = ffs_func_setup; | |
1473 | func->function.suspend = ffs_func_suspend; | |
1474 | func->function.resume = ffs_func_resume; | |
1475 | ||
1476 | func->conf = c; | |
1477 | func->gadget = cdev->gadget; | |
1478 | func->ffs = ffs; | |
1479 | ffs_data_get(ffs); | |
1480 | ||
1481 | ret = usb_add_function(c, &func->function); | |
1482 | if (unlikely(ret)) | |
1483 | ffs_func_free(func); | |
1484 | ||
1485 | return ret; | |
1486 | } | |
1487 | ||
1488 | static void ffs_func_free(struct ffs_function *func) | |
1489 | { | |
1490 | ENTER(); | |
1491 | ||
1492 | ffs_data_put(func->ffs); | |
1493 | ||
1494 | kfree(func->eps); | |
5ab54cf7 MN |
1495 | /* |
1496 | * eps and interfaces_nums are allocated in the same chunk so | |
ddf8abd2 | 1497 | * only one free is required. Descriptors are also allocated |
5ab54cf7 MN |
1498 | * in the same chunk. |
1499 | */ | |
ddf8abd2 MN |
1500 | |
1501 | kfree(func); | |
1502 | } | |
1503 | ||
ddf8abd2 MN |
1504 | static void ffs_func_eps_disable(struct ffs_function *func) |
1505 | { | |
1506 | struct ffs_ep *ep = func->eps; | |
1507 | struct ffs_epfile *epfile = func->ffs->epfiles; | |
1508 | unsigned count = func->ffs->eps_count; | |
1509 | unsigned long flags; | |
1510 | ||
1511 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1512 | do { | |
1513 | /* pending requests get nuked */ | |
1514 | if (likely(ep->ep)) | |
1515 | usb_ep_disable(ep->ep); | |
1516 | epfile->ep = NULL; | |
1517 | ||
1518 | ++ep; | |
1519 | ++epfile; | |
1520 | } while (--count); | |
1521 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1522 | } | |
1523 | ||
1524 | static int ffs_func_eps_enable(struct ffs_function *func) | |
1525 | { | |
1526 | struct ffs_data *ffs = func->ffs; | |
1527 | struct ffs_ep *ep = func->eps; | |
1528 | struct ffs_epfile *epfile = ffs->epfiles; | |
1529 | unsigned count = ffs->eps_count; | |
1530 | unsigned long flags; | |
1531 | int ret = 0; | |
1532 | ||
1533 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1534 | do { | |
1535 | struct usb_endpoint_descriptor *ds; | |
1536 | ds = ep->descs[ep->descs[1] ? 1 : 0]; | |
1537 | ||
1538 | ep->ep->driver_data = ep; | |
72c973dd TB |
1539 | ep->ep->desc = ds; |
1540 | ret = usb_ep_enable(ep->ep); | |
ddf8abd2 MN |
1541 | if (likely(!ret)) { |
1542 | epfile->ep = ep; | |
1543 | epfile->in = usb_endpoint_dir_in(ds); | |
1544 | epfile->isoc = usb_endpoint_xfer_isoc(ds); | |
1545 | } else { | |
1546 | break; | |
1547 | } | |
1548 | ||
1549 | wake_up(&epfile->wait); | |
1550 | ||
1551 | ++ep; | |
1552 | ++epfile; | |
1553 | } while (--count); | |
1554 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1555 | ||
1556 | return ret; | |
1557 | } | |
1558 | ||
1559 | ||
1560 | /* Parsing and building descriptors and strings *****************************/ | |
1561 | ||
5ab54cf7 MN |
1562 | /* |
1563 | * This validates if data pointed by data is a valid USB descriptor as | |
ddf8abd2 | 1564 | * well as record how many interfaces, endpoints and strings are |
5ab54cf7 MN |
1565 | * required by given configuration. Returns address after the |
1566 | * descriptor or NULL if data is invalid. | |
1567 | */ | |
ddf8abd2 MN |
1568 | |
1569 | enum ffs_entity_type { | |
1570 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT | |
1571 | }; | |
1572 | ||
1573 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, | |
1574 | u8 *valuep, | |
1575 | struct usb_descriptor_header *desc, | |
1576 | void *priv); | |
1577 | ||
1578 | static int __must_check ffs_do_desc(char *data, unsigned len, | |
1579 | ffs_entity_callback entity, void *priv) | |
1580 | { | |
1581 | struct usb_descriptor_header *_ds = (void *)data; | |
1582 | u8 length; | |
1583 | int ret; | |
1584 | ||
1585 | ENTER(); | |
1586 | ||
1587 | /* At least two bytes are required: length and type */ | |
1588 | if (len < 2) { | |
aa02f172 | 1589 | pr_vdebug("descriptor too short\n"); |
ddf8abd2 MN |
1590 | return -EINVAL; |
1591 | } | |
1592 | ||
1593 | /* If we have at least as many bytes as the descriptor takes? */ | |
1594 | length = _ds->bLength; | |
1595 | if (len < length) { | |
aa02f172 | 1596 | pr_vdebug("descriptor longer then available data\n"); |
ddf8abd2 MN |
1597 | return -EINVAL; |
1598 | } | |
1599 | ||
1600 | #define __entity_check_INTERFACE(val) 1 | |
1601 | #define __entity_check_STRING(val) (val) | |
1602 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) | |
1603 | #define __entity(type, val) do { \ | |
aa02f172 | 1604 | pr_vdebug("entity " #type "(%02x)\n", (val)); \ |
ddf8abd2 | 1605 | if (unlikely(!__entity_check_ ##type(val))) { \ |
aa02f172 | 1606 | pr_vdebug("invalid entity's value\n"); \ |
ddf8abd2 MN |
1607 | return -EINVAL; \ |
1608 | } \ | |
1609 | ret = entity(FFS_ ##type, &val, _ds, priv); \ | |
1610 | if (unlikely(ret < 0)) { \ | |
aa02f172 | 1611 | pr_debug("entity " #type "(%02x); ret = %d\n", \ |
d8df0b61 | 1612 | (val), ret); \ |
ddf8abd2 MN |
1613 | return ret; \ |
1614 | } \ | |
1615 | } while (0) | |
1616 | ||
1617 | /* Parse descriptor depending on type. */ | |
1618 | switch (_ds->bDescriptorType) { | |
1619 | case USB_DT_DEVICE: | |
1620 | case USB_DT_CONFIG: | |
1621 | case USB_DT_STRING: | |
1622 | case USB_DT_DEVICE_QUALIFIER: | |
1623 | /* function can't have any of those */ | |
aa02f172 | 1624 | pr_vdebug("descriptor reserved for gadget: %d\n", |
5ab54cf7 | 1625 | _ds->bDescriptorType); |
ddf8abd2 MN |
1626 | return -EINVAL; |
1627 | ||
1628 | case USB_DT_INTERFACE: { | |
1629 | struct usb_interface_descriptor *ds = (void *)_ds; | |
aa02f172 | 1630 | pr_vdebug("interface descriptor\n"); |
ddf8abd2 MN |
1631 | if (length != sizeof *ds) |
1632 | goto inv_length; | |
1633 | ||
1634 | __entity(INTERFACE, ds->bInterfaceNumber); | |
1635 | if (ds->iInterface) | |
1636 | __entity(STRING, ds->iInterface); | |
1637 | } | |
1638 | break; | |
1639 | ||
1640 | case USB_DT_ENDPOINT: { | |
1641 | struct usb_endpoint_descriptor *ds = (void *)_ds; | |
aa02f172 | 1642 | pr_vdebug("endpoint descriptor\n"); |
ddf8abd2 MN |
1643 | if (length != USB_DT_ENDPOINT_SIZE && |
1644 | length != USB_DT_ENDPOINT_AUDIO_SIZE) | |
1645 | goto inv_length; | |
1646 | __entity(ENDPOINT, ds->bEndpointAddress); | |
1647 | } | |
1648 | break; | |
1649 | ||
1650 | case USB_DT_OTG: | |
1651 | if (length != sizeof(struct usb_otg_descriptor)) | |
1652 | goto inv_length; | |
1653 | break; | |
1654 | ||
1655 | case USB_DT_INTERFACE_ASSOCIATION: { | |
1656 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; | |
aa02f172 | 1657 | pr_vdebug("interface association descriptor\n"); |
ddf8abd2 MN |
1658 | if (length != sizeof *ds) |
1659 | goto inv_length; | |
1660 | if (ds->iFunction) | |
1661 | __entity(STRING, ds->iFunction); | |
1662 | } | |
1663 | break; | |
1664 | ||
1665 | case USB_DT_OTHER_SPEED_CONFIG: | |
1666 | case USB_DT_INTERFACE_POWER: | |
1667 | case USB_DT_DEBUG: | |
1668 | case USB_DT_SECURITY: | |
1669 | case USB_DT_CS_RADIO_CONTROL: | |
1670 | /* TODO */ | |
aa02f172 | 1671 | pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1672 | return -EINVAL; |
1673 | ||
1674 | default: | |
1675 | /* We should never be here */ | |
aa02f172 | 1676 | pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1677 | return -EINVAL; |
1678 | ||
5ab54cf7 | 1679 | inv_length: |
aa02f172 | 1680 | pr_vdebug("invalid length: %d (descriptor %d)\n", |
d8df0b61 | 1681 | _ds->bLength, _ds->bDescriptorType); |
ddf8abd2 MN |
1682 | return -EINVAL; |
1683 | } | |
1684 | ||
1685 | #undef __entity | |
1686 | #undef __entity_check_DESCRIPTOR | |
1687 | #undef __entity_check_INTERFACE | |
1688 | #undef __entity_check_STRING | |
1689 | #undef __entity_check_ENDPOINT | |
1690 | ||
1691 | return length; | |
1692 | } | |
1693 | ||
ddf8abd2 MN |
1694 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
1695 | ffs_entity_callback entity, void *priv) | |
1696 | { | |
1697 | const unsigned _len = len; | |
1698 | unsigned long num = 0; | |
1699 | ||
1700 | ENTER(); | |
1701 | ||
1702 | for (;;) { | |
1703 | int ret; | |
1704 | ||
1705 | if (num == count) | |
1706 | data = NULL; | |
1707 | ||
5ab54cf7 | 1708 | /* Record "descriptor" entity */ |
ddf8abd2 MN |
1709 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
1710 | if (unlikely(ret < 0)) { | |
aa02f172 | 1711 | pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", |
d8df0b61 | 1712 | num, ret); |
ddf8abd2 MN |
1713 | return ret; |
1714 | } | |
1715 | ||
1716 | if (!data) | |
1717 | return _len - len; | |
1718 | ||
1719 | ret = ffs_do_desc(data, len, entity, priv); | |
1720 | if (unlikely(ret < 0)) { | |
aa02f172 | 1721 | pr_debug("%s returns %d\n", __func__, ret); |
ddf8abd2 MN |
1722 | return ret; |
1723 | } | |
1724 | ||
1725 | len -= ret; | |
1726 | data += ret; | |
1727 | ++num; | |
1728 | } | |
1729 | } | |
1730 | ||
ddf8abd2 MN |
1731 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
1732 | u8 *valuep, struct usb_descriptor_header *desc, | |
1733 | void *priv) | |
1734 | { | |
1735 | struct ffs_data *ffs = priv; | |
1736 | ||
1737 | ENTER(); | |
1738 | ||
1739 | switch (type) { | |
1740 | case FFS_DESCRIPTOR: | |
1741 | break; | |
1742 | ||
1743 | case FFS_INTERFACE: | |
5ab54cf7 MN |
1744 | /* |
1745 | * Interfaces are indexed from zero so if we | |
ddf8abd2 | 1746 | * encountered interface "n" then there are at least |
5ab54cf7 MN |
1747 | * "n+1" interfaces. |
1748 | */ | |
ddf8abd2 MN |
1749 | if (*valuep >= ffs->interfaces_count) |
1750 | ffs->interfaces_count = *valuep + 1; | |
1751 | break; | |
1752 | ||
1753 | case FFS_STRING: | |
5ab54cf7 MN |
1754 | /* |
1755 | * Strings are indexed from 1 (0 is magic ;) reserved | |
1756 | * for languages list or some such) | |
1757 | */ | |
ddf8abd2 MN |
1758 | if (*valuep > ffs->strings_count) |
1759 | ffs->strings_count = *valuep; | |
1760 | break; | |
1761 | ||
1762 | case FFS_ENDPOINT: | |
1763 | /* Endpoints are indexed from 1 as well. */ | |
1764 | if ((*valuep & USB_ENDPOINT_NUMBER_MASK) > ffs->eps_count) | |
1765 | ffs->eps_count = (*valuep & USB_ENDPOINT_NUMBER_MASK); | |
1766 | break; | |
1767 | } | |
1768 | ||
1769 | return 0; | |
1770 | } | |
1771 | ||
ddf8abd2 MN |
1772 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
1773 | char *const _data, size_t len) | |
1774 | { | |
1775 | unsigned fs_count, hs_count; | |
1776 | int fs_len, ret = -EINVAL; | |
1777 | char *data = _data; | |
1778 | ||
1779 | ENTER(); | |
1780 | ||
1781 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_DESCRIPTORS_MAGIC || | |
1782 | get_unaligned_le32(data + 4) != len)) | |
1783 | goto error; | |
1784 | fs_count = get_unaligned_le32(data + 8); | |
1785 | hs_count = get_unaligned_le32(data + 12); | |
1786 | ||
1787 | if (!fs_count && !hs_count) | |
1788 | goto einval; | |
1789 | ||
1790 | data += 16; | |
1791 | len -= 16; | |
1792 | ||
1793 | if (likely(fs_count)) { | |
1794 | fs_len = ffs_do_descs(fs_count, data, len, | |
1795 | __ffs_data_do_entity, ffs); | |
1796 | if (unlikely(fs_len < 0)) { | |
1797 | ret = fs_len; | |
1798 | goto error; | |
1799 | } | |
1800 | ||
1801 | data += fs_len; | |
1802 | len -= fs_len; | |
1803 | } else { | |
1804 | fs_len = 0; | |
1805 | } | |
1806 | ||
1807 | if (likely(hs_count)) { | |
1808 | ret = ffs_do_descs(hs_count, data, len, | |
1809 | __ffs_data_do_entity, ffs); | |
1810 | if (unlikely(ret < 0)) | |
1811 | goto error; | |
1812 | } else { | |
1813 | ret = 0; | |
1814 | } | |
1815 | ||
1816 | if (unlikely(len != ret)) | |
1817 | goto einval; | |
1818 | ||
1819 | ffs->raw_fs_descs_length = fs_len; | |
1820 | ffs->raw_descs_length = fs_len + ret; | |
1821 | ffs->raw_descs = _data; | |
1822 | ffs->fs_descs_count = fs_count; | |
1823 | ffs->hs_descs_count = hs_count; | |
1824 | ||
1825 | return 0; | |
1826 | ||
1827 | einval: | |
1828 | ret = -EINVAL; | |
1829 | error: | |
1830 | kfree(_data); | |
1831 | return ret; | |
1832 | } | |
1833 | ||
ddf8abd2 MN |
1834 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
1835 | char *const _data, size_t len) | |
1836 | { | |
1837 | u32 str_count, needed_count, lang_count; | |
1838 | struct usb_gadget_strings **stringtabs, *t; | |
1839 | struct usb_string *strings, *s; | |
1840 | const char *data = _data; | |
1841 | ||
1842 | ENTER(); | |
1843 | ||
1844 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || | |
1845 | get_unaligned_le32(data + 4) != len)) | |
1846 | goto error; | |
1847 | str_count = get_unaligned_le32(data + 8); | |
1848 | lang_count = get_unaligned_le32(data + 12); | |
1849 | ||
1850 | /* if one is zero the other must be zero */ | |
1851 | if (unlikely(!str_count != !lang_count)) | |
1852 | goto error; | |
1853 | ||
1854 | /* Do we have at least as many strings as descriptors need? */ | |
1855 | needed_count = ffs->strings_count; | |
1856 | if (unlikely(str_count < needed_count)) | |
1857 | goto error; | |
1858 | ||
5ab54cf7 MN |
1859 | /* |
1860 | * If we don't need any strings just return and free all | |
1861 | * memory. | |
1862 | */ | |
ddf8abd2 MN |
1863 | if (!needed_count) { |
1864 | kfree(_data); | |
1865 | return 0; | |
1866 | } | |
1867 | ||
5ab54cf7 | 1868 | /* Allocate everything in one chunk so there's less maintenance. */ |
ddf8abd2 | 1869 | { |
ddf8abd2 MN |
1870 | struct { |
1871 | struct usb_gadget_strings *stringtabs[lang_count + 1]; | |
1872 | struct usb_gadget_strings stringtab[lang_count]; | |
1873 | struct usb_string strings[lang_count*(needed_count+1)]; | |
1874 | } *d; | |
1875 | unsigned i = 0; | |
1876 | ||
1877 | d = kmalloc(sizeof *d, GFP_KERNEL); | |
1878 | if (unlikely(!d)) { | |
1879 | kfree(_data); | |
1880 | return -ENOMEM; | |
1881 | } | |
1882 | ||
1883 | stringtabs = d->stringtabs; | |
1884 | t = d->stringtab; | |
1885 | i = lang_count; | |
1886 | do { | |
1887 | *stringtabs++ = t++; | |
1888 | } while (--i); | |
1889 | *stringtabs = NULL; | |
1890 | ||
1891 | stringtabs = d->stringtabs; | |
1892 | t = d->stringtab; | |
1893 | s = d->strings; | |
1894 | strings = s; | |
1895 | } | |
1896 | ||
1897 | /* For each language */ | |
1898 | data += 16; | |
1899 | len -= 16; | |
1900 | ||
1901 | do { /* lang_count > 0 so we can use do-while */ | |
1902 | unsigned needed = needed_count; | |
1903 | ||
1904 | if (unlikely(len < 3)) | |
1905 | goto error_free; | |
1906 | t->language = get_unaligned_le16(data); | |
1907 | t->strings = s; | |
1908 | ++t; | |
1909 | ||
1910 | data += 2; | |
1911 | len -= 2; | |
1912 | ||
1913 | /* For each string */ | |
1914 | do { /* str_count > 0 so we can use do-while */ | |
1915 | size_t length = strnlen(data, len); | |
1916 | ||
1917 | if (unlikely(length == len)) | |
1918 | goto error_free; | |
1919 | ||
5ab54cf7 MN |
1920 | /* |
1921 | * User may provide more strings then we need, | |
1922 | * if that's the case we simply ignore the | |
1923 | * rest | |
1924 | */ | |
ddf8abd2 | 1925 | if (likely(needed)) { |
5ab54cf7 MN |
1926 | /* |
1927 | * s->id will be set while adding | |
ddf8abd2 | 1928 | * function to configuration so for |
5ab54cf7 MN |
1929 | * now just leave garbage here. |
1930 | */ | |
ddf8abd2 MN |
1931 | s->s = data; |
1932 | --needed; | |
1933 | ++s; | |
1934 | } | |
1935 | ||
1936 | data += length + 1; | |
1937 | len -= length + 1; | |
1938 | } while (--str_count); | |
1939 | ||
1940 | s->id = 0; /* terminator */ | |
1941 | s->s = NULL; | |
1942 | ++s; | |
1943 | ||
1944 | } while (--lang_count); | |
1945 | ||
1946 | /* Some garbage left? */ | |
1947 | if (unlikely(len)) | |
1948 | goto error_free; | |
1949 | ||
1950 | /* Done! */ | |
1951 | ffs->stringtabs = stringtabs; | |
1952 | ffs->raw_strings = _data; | |
1953 | ||
1954 | return 0; | |
1955 | ||
1956 | error_free: | |
1957 | kfree(stringtabs); | |
1958 | error: | |
1959 | kfree(_data); | |
1960 | return -EINVAL; | |
1961 | } | |
1962 | ||
1963 | ||
ddf8abd2 MN |
1964 | /* Events handling and management *******************************************/ |
1965 | ||
1966 | static void __ffs_event_add(struct ffs_data *ffs, | |
1967 | enum usb_functionfs_event_type type) | |
1968 | { | |
1969 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; | |
1970 | int neg = 0; | |
1971 | ||
5ab54cf7 MN |
1972 | /* |
1973 | * Abort any unhandled setup | |
1974 | * | |
1975 | * We do not need to worry about some cmpxchg() changing value | |
ddf8abd2 MN |
1976 | * of ffs->setup_state without holding the lock because when |
1977 | * state is FFS_SETUP_PENDING cmpxchg() in several places in | |
5ab54cf7 MN |
1978 | * the source does nothing. |
1979 | */ | |
ddf8abd2 MN |
1980 | if (ffs->setup_state == FFS_SETUP_PENDING) |
1981 | ffs->setup_state = FFS_SETUP_CANCELED; | |
1982 | ||
1983 | switch (type) { | |
1984 | case FUNCTIONFS_RESUME: | |
1985 | rem_type2 = FUNCTIONFS_SUSPEND; | |
5ab54cf7 | 1986 | /* FALL THROUGH */ |
ddf8abd2 MN |
1987 | case FUNCTIONFS_SUSPEND: |
1988 | case FUNCTIONFS_SETUP: | |
1989 | rem_type1 = type; | |
5ab54cf7 | 1990 | /* Discard all similar events */ |
ddf8abd2 MN |
1991 | break; |
1992 | ||
1993 | case FUNCTIONFS_BIND: | |
1994 | case FUNCTIONFS_UNBIND: | |
1995 | case FUNCTIONFS_DISABLE: | |
1996 | case FUNCTIONFS_ENABLE: | |
5ab54cf7 | 1997 | /* Discard everything other then power management. */ |
ddf8abd2 MN |
1998 | rem_type1 = FUNCTIONFS_SUSPEND; |
1999 | rem_type2 = FUNCTIONFS_RESUME; | |
2000 | neg = 1; | |
2001 | break; | |
2002 | ||
2003 | default: | |
2004 | BUG(); | |
2005 | } | |
2006 | ||
2007 | { | |
2008 | u8 *ev = ffs->ev.types, *out = ev; | |
2009 | unsigned n = ffs->ev.count; | |
2010 | for (; n; --n, ++ev) | |
2011 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) | |
2012 | *out++ = *ev; | |
2013 | else | |
aa02f172 | 2014 | pr_vdebug("purging event %d\n", *ev); |
ddf8abd2 MN |
2015 | ffs->ev.count = out - ffs->ev.types; |
2016 | } | |
2017 | ||
aa02f172 | 2018 | pr_vdebug("adding event %d\n", type); |
ddf8abd2 MN |
2019 | ffs->ev.types[ffs->ev.count++] = type; |
2020 | wake_up_locked(&ffs->ev.waitq); | |
2021 | } | |
2022 | ||
2023 | static void ffs_event_add(struct ffs_data *ffs, | |
2024 | enum usb_functionfs_event_type type) | |
2025 | { | |
2026 | unsigned long flags; | |
2027 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2028 | __ffs_event_add(ffs, type); | |
2029 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2030 | } | |
2031 | ||
2032 | ||
2033 | /* Bind/unbind USB function hooks *******************************************/ | |
2034 | ||
2035 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, | |
2036 | struct usb_descriptor_header *desc, | |
2037 | void *priv) | |
2038 | { | |
2039 | struct usb_endpoint_descriptor *ds = (void *)desc; | |
2040 | struct ffs_function *func = priv; | |
2041 | struct ffs_ep *ffs_ep; | |
2042 | ||
5ab54cf7 MN |
2043 | /* |
2044 | * If hs_descriptors is not NULL then we are reading hs | |
2045 | * descriptors now | |
2046 | */ | |
ddf8abd2 MN |
2047 | const int isHS = func->function.hs_descriptors != NULL; |
2048 | unsigned idx; | |
2049 | ||
2050 | if (type != FFS_DESCRIPTOR) | |
2051 | return 0; | |
2052 | ||
2053 | if (isHS) | |
2054 | func->function.hs_descriptors[(long)valuep] = desc; | |
2055 | else | |
2056 | func->function.descriptors[(long)valuep] = desc; | |
2057 | ||
2058 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) | |
2059 | return 0; | |
2060 | ||
2061 | idx = (ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2062 | ffs_ep = func->eps + idx; | |
2063 | ||
2064 | if (unlikely(ffs_ep->descs[isHS])) { | |
aa02f172 | 2065 | pr_vdebug("two %sspeed descriptors for EP %d\n", |
d8df0b61 MN |
2066 | isHS ? "high" : "full", |
2067 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
ddf8abd2 MN |
2068 | return -EINVAL; |
2069 | } | |
2070 | ffs_ep->descs[isHS] = ds; | |
2071 | ||
2072 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); | |
2073 | if (ffs_ep->ep) { | |
2074 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; | |
2075 | if (!ds->wMaxPacketSize) | |
2076 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; | |
2077 | } else { | |
2078 | struct usb_request *req; | |
2079 | struct usb_ep *ep; | |
2080 | ||
aa02f172 | 2081 | pr_vdebug("autoconfig\n"); |
ddf8abd2 MN |
2082 | ep = usb_ep_autoconfig(func->gadget, ds); |
2083 | if (unlikely(!ep)) | |
2084 | return -ENOTSUPP; | |
cc7e6056 | 2085 | ep->driver_data = func->eps + idx; |
ddf8abd2 MN |
2086 | |
2087 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
2088 | if (unlikely(!req)) | |
2089 | return -ENOMEM; | |
2090 | ||
2091 | ffs_ep->ep = ep; | |
2092 | ffs_ep->req = req; | |
2093 | func->eps_revmap[ds->bEndpointAddress & | |
2094 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; | |
2095 | } | |
2096 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); | |
2097 | ||
2098 | return 0; | |
2099 | } | |
2100 | ||
ddf8abd2 MN |
2101 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, |
2102 | struct usb_descriptor_header *desc, | |
2103 | void *priv) | |
2104 | { | |
2105 | struct ffs_function *func = priv; | |
2106 | unsigned idx; | |
2107 | u8 newValue; | |
2108 | ||
2109 | switch (type) { | |
2110 | default: | |
2111 | case FFS_DESCRIPTOR: | |
2112 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ | |
2113 | return 0; | |
2114 | ||
2115 | case FFS_INTERFACE: | |
2116 | idx = *valuep; | |
2117 | if (func->interfaces_nums[idx] < 0) { | |
2118 | int id = usb_interface_id(func->conf, &func->function); | |
2119 | if (unlikely(id < 0)) | |
2120 | return id; | |
2121 | func->interfaces_nums[idx] = id; | |
2122 | } | |
2123 | newValue = func->interfaces_nums[idx]; | |
2124 | break; | |
2125 | ||
2126 | case FFS_STRING: | |
2127 | /* String' IDs are allocated when fsf_data is bound to cdev */ | |
2128 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; | |
2129 | break; | |
2130 | ||
2131 | case FFS_ENDPOINT: | |
5ab54cf7 MN |
2132 | /* |
2133 | * USB_DT_ENDPOINT are handled in | |
2134 | * __ffs_func_bind_do_descs(). | |
2135 | */ | |
ddf8abd2 MN |
2136 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
2137 | return 0; | |
2138 | ||
2139 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2140 | if (unlikely(!func->eps[idx].ep)) | |
2141 | return -EINVAL; | |
2142 | ||
2143 | { | |
2144 | struct usb_endpoint_descriptor **descs; | |
2145 | descs = func->eps[idx].descs; | |
2146 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; | |
2147 | } | |
2148 | break; | |
2149 | } | |
2150 | ||
aa02f172 | 2151 | pr_vdebug("%02x -> %02x\n", *valuep, newValue); |
ddf8abd2 MN |
2152 | *valuep = newValue; |
2153 | return 0; | |
2154 | } | |
2155 | ||
2156 | static int ffs_func_bind(struct usb_configuration *c, | |
2157 | struct usb_function *f) | |
2158 | { | |
2159 | struct ffs_function *func = ffs_func_from_usb(f); | |
2160 | struct ffs_data *ffs = func->ffs; | |
2161 | ||
2162 | const int full = !!func->ffs->fs_descs_count; | |
2163 | const int high = gadget_is_dualspeed(func->gadget) && | |
2164 | func->ffs->hs_descs_count; | |
2165 | ||
2166 | int ret; | |
2167 | ||
2168 | /* Make it a single chunk, less management later on */ | |
2169 | struct { | |
2170 | struct ffs_ep eps[ffs->eps_count]; | |
2171 | struct usb_descriptor_header | |
2172 | *fs_descs[full ? ffs->fs_descs_count + 1 : 0]; | |
2173 | struct usb_descriptor_header | |
2174 | *hs_descs[high ? ffs->hs_descs_count + 1 : 0]; | |
2175 | short inums[ffs->interfaces_count]; | |
2176 | char raw_descs[high ? ffs->raw_descs_length | |
2177 | : ffs->raw_fs_descs_length]; | |
2178 | } *data; | |
2179 | ||
2180 | ENTER(); | |
2181 | ||
2182 | /* Only high speed but not supported by gadget? */ | |
2183 | if (unlikely(!(full | high))) | |
2184 | return -ENOTSUPP; | |
2185 | ||
2186 | /* Allocate */ | |
2187 | data = kmalloc(sizeof *data, GFP_KERNEL); | |
2188 | if (unlikely(!data)) | |
2189 | return -ENOMEM; | |
2190 | ||
2191 | /* Zero */ | |
2192 | memset(data->eps, 0, sizeof data->eps); | |
2193 | memcpy(data->raw_descs, ffs->raw_descs + 16, sizeof data->raw_descs); | |
2194 | memset(data->inums, 0xff, sizeof data->inums); | |
2195 | for (ret = ffs->eps_count; ret; --ret) | |
2196 | data->eps[ret].num = -1; | |
2197 | ||
2198 | /* Save pointers */ | |
2199 | func->eps = data->eps; | |
2200 | func->interfaces_nums = data->inums; | |
2201 | ||
5ab54cf7 MN |
2202 | /* |
2203 | * Go through all the endpoint descriptors and allocate | |
ddf8abd2 | 2204 | * endpoints first, so that later we can rewrite the endpoint |
5ab54cf7 MN |
2205 | * numbers without worrying that it may be described later on. |
2206 | */ | |
ddf8abd2 MN |
2207 | if (likely(full)) { |
2208 | func->function.descriptors = data->fs_descs; | |
2209 | ret = ffs_do_descs(ffs->fs_descs_count, | |
2210 | data->raw_descs, | |
2211 | sizeof data->raw_descs, | |
2212 | __ffs_func_bind_do_descs, func); | |
2213 | if (unlikely(ret < 0)) | |
2214 | goto error; | |
2215 | } else { | |
2216 | ret = 0; | |
2217 | } | |
2218 | ||
2219 | if (likely(high)) { | |
2220 | func->function.hs_descriptors = data->hs_descs; | |
2221 | ret = ffs_do_descs(ffs->hs_descs_count, | |
2222 | data->raw_descs + ret, | |
2223 | (sizeof data->raw_descs) - ret, | |
2224 | __ffs_func_bind_do_descs, func); | |
2225 | } | |
2226 | ||
5ab54cf7 MN |
2227 | /* |
2228 | * Now handle interface numbers allocation and interface and | |
2229 | * endpoint numbers rewriting. We can do that in one go | |
2230 | * now. | |
2231 | */ | |
ddf8abd2 MN |
2232 | ret = ffs_do_descs(ffs->fs_descs_count + |
2233 | (high ? ffs->hs_descs_count : 0), | |
2234 | data->raw_descs, sizeof data->raw_descs, | |
2235 | __ffs_func_bind_do_nums, func); | |
2236 | if (unlikely(ret < 0)) | |
2237 | goto error; | |
2238 | ||
2239 | /* And we're done */ | |
2240 | ffs_event_add(ffs, FUNCTIONFS_BIND); | |
2241 | return 0; | |
2242 | ||
2243 | error: | |
2244 | /* XXX Do we need to release all claimed endpoints here? */ | |
2245 | return ret; | |
2246 | } | |
2247 | ||
2248 | ||
2249 | /* Other USB function hooks *************************************************/ | |
2250 | ||
2251 | static void ffs_func_unbind(struct usb_configuration *c, | |
2252 | struct usb_function *f) | |
2253 | { | |
2254 | struct ffs_function *func = ffs_func_from_usb(f); | |
2255 | struct ffs_data *ffs = func->ffs; | |
2256 | ||
2257 | ENTER(); | |
2258 | ||
2259 | if (ffs->func == func) { | |
2260 | ffs_func_eps_disable(func); | |
2261 | ffs->func = NULL; | |
2262 | } | |
2263 | ||
2264 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); | |
2265 | ||
2266 | ffs_func_free(func); | |
2267 | } | |
2268 | ||
ddf8abd2 MN |
2269 | static int ffs_func_set_alt(struct usb_function *f, |
2270 | unsigned interface, unsigned alt) | |
2271 | { | |
2272 | struct ffs_function *func = ffs_func_from_usb(f); | |
2273 | struct ffs_data *ffs = func->ffs; | |
2274 | int ret = 0, intf; | |
2275 | ||
2276 | if (alt != (unsigned)-1) { | |
2277 | intf = ffs_func_revmap_intf(func, interface); | |
2278 | if (unlikely(intf < 0)) | |
2279 | return intf; | |
2280 | } | |
2281 | ||
2282 | if (ffs->func) | |
2283 | ffs_func_eps_disable(ffs->func); | |
2284 | ||
2285 | if (ffs->state != FFS_ACTIVE) | |
2286 | return -ENODEV; | |
2287 | ||
2288 | if (alt == (unsigned)-1) { | |
2289 | ffs->func = NULL; | |
2290 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); | |
2291 | return 0; | |
2292 | } | |
2293 | ||
2294 | ffs->func = func; | |
2295 | ret = ffs_func_eps_enable(func); | |
2296 | if (likely(ret >= 0)) | |
2297 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); | |
2298 | return ret; | |
2299 | } | |
2300 | ||
2301 | static void ffs_func_disable(struct usb_function *f) | |
2302 | { | |
2303 | ffs_func_set_alt(f, 0, (unsigned)-1); | |
2304 | } | |
2305 | ||
2306 | static int ffs_func_setup(struct usb_function *f, | |
2307 | const struct usb_ctrlrequest *creq) | |
2308 | { | |
2309 | struct ffs_function *func = ffs_func_from_usb(f); | |
2310 | struct ffs_data *ffs = func->ffs; | |
2311 | unsigned long flags; | |
2312 | int ret; | |
2313 | ||
2314 | ENTER(); | |
2315 | ||
aa02f172 MN |
2316 | pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); |
2317 | pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); | |
2318 | pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); | |
2319 | pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); | |
2320 | pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); | |
ddf8abd2 | 2321 | |
5ab54cf7 MN |
2322 | /* |
2323 | * Most requests directed to interface go through here | |
ddf8abd2 MN |
2324 | * (notable exceptions are set/get interface) so we need to |
2325 | * handle them. All other either handled by composite or | |
2326 | * passed to usb_configuration->setup() (if one is set). No | |
2327 | * matter, we will handle requests directed to endpoint here | |
2328 | * as well (as it's straightforward) but what to do with any | |
5ab54cf7 MN |
2329 | * other request? |
2330 | */ | |
ddf8abd2 MN |
2331 | if (ffs->state != FFS_ACTIVE) |
2332 | return -ENODEV; | |
2333 | ||
2334 | switch (creq->bRequestType & USB_RECIP_MASK) { | |
2335 | case USB_RECIP_INTERFACE: | |
2336 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); | |
2337 | if (unlikely(ret < 0)) | |
2338 | return ret; | |
2339 | break; | |
2340 | ||
2341 | case USB_RECIP_ENDPOINT: | |
2342 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); | |
2343 | if (unlikely(ret < 0)) | |
2344 | return ret; | |
2345 | break; | |
2346 | ||
2347 | default: | |
2348 | return -EOPNOTSUPP; | |
2349 | } | |
2350 | ||
2351 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2352 | ffs->ev.setup = *creq; | |
2353 | ffs->ev.setup.wIndex = cpu_to_le16(ret); | |
2354 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); | |
2355 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2356 | ||
2357 | return 0; | |
2358 | } | |
2359 | ||
2360 | static void ffs_func_suspend(struct usb_function *f) | |
2361 | { | |
2362 | ENTER(); | |
2363 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); | |
2364 | } | |
2365 | ||
2366 | static void ffs_func_resume(struct usb_function *f) | |
2367 | { | |
2368 | ENTER(); | |
2369 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); | |
2370 | } | |
2371 | ||
2372 | ||
5ab54cf7 | 2373 | /* Endpoint and interface numbers reverse mapping ***************************/ |
ddf8abd2 MN |
2374 | |
2375 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) | |
2376 | { | |
2377 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; | |
2378 | return num ? num : -EDOM; | |
2379 | } | |
2380 | ||
2381 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) | |
2382 | { | |
2383 | short *nums = func->interfaces_nums; | |
2384 | unsigned count = func->ffs->interfaces_count; | |
2385 | ||
2386 | for (; count; --count, ++nums) { | |
2387 | if (*nums >= 0 && *nums == intf) | |
2388 | return nums - func->interfaces_nums; | |
2389 | } | |
2390 | ||
2391 | return -EDOM; | |
2392 | } | |
2393 | ||
2394 | ||
2395 | /* Misc helper functions ****************************************************/ | |
2396 | ||
2397 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
2398 | { | |
2399 | return nonblock | |
2400 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN | |
2401 | : mutex_lock_interruptible(mutex); | |
2402 | } | |
2403 | ||
ddf8abd2 MN |
2404 | static char *ffs_prepare_buffer(const char * __user buf, size_t len) |
2405 | { | |
2406 | char *data; | |
2407 | ||
2408 | if (unlikely(!len)) | |
2409 | return NULL; | |
2410 | ||
2411 | data = kmalloc(len, GFP_KERNEL); | |
2412 | if (unlikely(!data)) | |
2413 | return ERR_PTR(-ENOMEM); | |
2414 | ||
2415 | if (unlikely(__copy_from_user(data, buf, len))) { | |
2416 | kfree(data); | |
2417 | return ERR_PTR(-EFAULT); | |
2418 | } | |
2419 | ||
aa02f172 | 2420 | pr_vdebug("Buffer from user space:\n"); |
ddf8abd2 MN |
2421 | ffs_dump_mem("", data, len); |
2422 | ||
2423 | return data; | |
2424 | } |