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ddf8abd2 MN |
1 | /* |
2 | * f_fs.c -- user mode filesystem api for usb composite funtcion controllers | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * Author: Michal Nazarewicz <m.nazarewicz@samsung.com> | |
6 | * | |
7 | * Based on inode.c (GadgetFS): | |
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. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | */ | |
25 | ||
26 | ||
27 | /* #define DEBUG */ | |
28 | /* #define VERBOSE_DEBUG */ | |
29 | ||
30 | #include <linux/blkdev.h> | |
b0608690 | 31 | #include <linux/pagemap.h> |
ddf8abd2 MN |
32 | #include <asm/unaligned.h> |
33 | #include <linux/smp_lock.h> | |
34 | ||
35 | #include <linux/usb/composite.h> | |
36 | #include <linux/usb/functionfs.h> | |
37 | ||
38 | ||
39 | #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ | |
40 | ||
41 | ||
42 | /* Debuging *****************************************************************/ | |
43 | ||
44 | #define ffs_printk(level, fmt, args...) printk(level "f_fs: " fmt "\n", ## args) | |
45 | ||
46 | #define FERR(...) ffs_printk(KERN_ERR, __VA_ARGS__) | |
47 | #define FINFO(...) ffs_printk(KERN_INFO, __VA_ARGS__) | |
48 | ||
49 | #ifdef DEBUG | |
50 | # define FDBG(...) ffs_printk(KERN_DEBUG, __VA_ARGS__) | |
51 | #else | |
52 | # define FDBG(...) do { } while (0) | |
53 | #endif /* DEBUG */ | |
54 | ||
55 | #ifdef VERBOSE_DEBUG | |
56 | # define FVDBG FDBG | |
57 | #else | |
58 | # define FVDBG(...) do { } while (0) | |
59 | #endif /* VERBOSE_DEBUG */ | |
60 | ||
61 | #define ENTER() FVDBG("%s()", __func__) | |
62 | ||
63 | #ifdef VERBOSE_DEBUG | |
64 | # define ffs_dump_mem(prefix, ptr, len) \ | |
65 | print_hex_dump_bytes("f_fs" prefix ": ", DUMP_PREFIX_NONE, ptr, len) | |
66 | #else | |
67 | # define ffs_dump_mem(prefix, ptr, len) do { } while (0) | |
68 | #endif | |
69 | ||
70 | ||
71 | /* The data structure and setup file ****************************************/ | |
72 | ||
73 | enum ffs_state { | |
74 | /* Waiting for descriptors and strings. */ | |
75 | /* In this state no open(2), read(2) or write(2) on epfiles | |
76 | * may succeed (which should not be the problem as there | |
77 | * should be no such files opened in the firts place). */ | |
78 | FFS_READ_DESCRIPTORS, | |
79 | FFS_READ_STRINGS, | |
80 | ||
81 | /* We've got descriptors and strings. We are or have called | |
82 | * functionfs_ready_callback(). functionfs_bind() may have | |
83 | * been called but we don't know. */ | |
84 | /* This is the only state in which operations on epfiles may | |
85 | * succeed. */ | |
86 | FFS_ACTIVE, | |
87 | ||
88 | /* All endpoints have been closed. This state is also set if | |
89 | * we encounter an unrecoverable error. The only | |
90 | * unrecoverable error is situation when after reading strings | |
91 | * from user space we fail to initialise EP files or | |
92 | * functionfs_ready_callback() returns with error (<0). */ | |
93 | /* In this state no open(2), read(2) or write(2) (both on ep0 | |
94 | * as well as epfile) may succeed (at this point epfiles are | |
95 | * unlinked and all closed so this is not a problem; ep0 is | |
96 | * also closed but ep0 file exists and so open(2) on ep0 must | |
97 | * fail). */ | |
98 | FFS_CLOSING | |
99 | }; | |
100 | ||
101 | ||
102 | enum ffs_setup_state { | |
103 | /* There is no setup request pending. */ | |
104 | FFS_NO_SETUP, | |
105 | /* User has read events and there was a setup request event | |
106 | * there. The next read/write on ep0 will handle the | |
107 | * request. */ | |
108 | FFS_SETUP_PENDING, | |
109 | /* There was event pending but before user space handled it | |
110 | * some other event was introduced which canceled existing | |
111 | * setup. If this state is set read/write on ep0 return | |
112 | * -EIDRM. This state is only set when adding event. */ | |
113 | FFS_SETUP_CANCELED | |
114 | }; | |
115 | ||
116 | ||
117 | ||
118 | struct ffs_epfile; | |
119 | struct ffs_function; | |
120 | ||
121 | struct ffs_data { | |
122 | struct usb_gadget *gadget; | |
123 | ||
124 | /* Protect access read/write operations, only one read/write | |
125 | * at a time. As a consequence protects ep0req and company. | |
126 | * While setup request is being processed (queued) this is | |
127 | * held. */ | |
128 | struct mutex mutex; | |
129 | ||
130 | /* Protect access to enpoint related structures (basically | |
131 | * usb_ep_queue(), usb_ep_dequeue(), etc. calls) except for | |
132 | * endpint zero. */ | |
133 | spinlock_t eps_lock; | |
134 | ||
135 | /* XXX REVISIT do we need our own request? Since we are not | |
136 | * handling setup requests immidiatelly user space may be so | |
137 | * slow that another setup will be sent to the gadget but this | |
138 | * time not to us but another function and then there could be | |
a4ce96ac | 139 | * a race. Is that the case? Or maybe we can use cdev->req |
ddf8abd2 MN |
140 | * after all, maybe we just need some spinlock for that? */ |
141 | struct usb_request *ep0req; /* P: mutex */ | |
142 | struct completion ep0req_completion; /* P: mutex */ | |
143 | int ep0req_status; /* P: mutex */ | |
144 | ||
145 | /* reference counter */ | |
146 | atomic_t ref; | |
147 | /* how many files are opened (EP0 and others) */ | |
148 | atomic_t opened; | |
149 | ||
150 | /* EP0 state */ | |
151 | enum ffs_state state; | |
152 | ||
153 | /* | |
154 | * Possible transations: | |
155 | * + FFS_NO_SETUP -> FFS_SETUP_PENDING -- P: ev.waitq.lock | |
156 | * happens only in ep0 read which is P: mutex | |
157 | * + FFS_SETUP_PENDING -> FFS_NO_SETUP -- P: ev.waitq.lock | |
158 | * happens only in ep0 i/o which is P: mutex | |
159 | * + FFS_SETUP_PENDING -> FFS_SETUP_CANCELED -- P: ev.waitq.lock | |
160 | * + FFS_SETUP_CANCELED -> FFS_NO_SETUP -- cmpxchg | |
161 | */ | |
162 | enum ffs_setup_state setup_state; | |
163 | ||
164 | #define FFS_SETUP_STATE(ffs) \ | |
165 | ((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \ | |
166 | FFS_SETUP_CANCELED, FFS_NO_SETUP)) | |
167 | ||
168 | /* Events & such. */ | |
169 | struct { | |
170 | u8 types[4]; | |
171 | unsigned short count; | |
172 | /* XXX REVISIT need to update it in some places, or do we? */ | |
173 | unsigned short can_stall; | |
174 | struct usb_ctrlrequest setup; | |
175 | ||
176 | wait_queue_head_t waitq; | |
177 | } ev; /* the whole structure, P: ev.waitq.lock */ | |
178 | ||
179 | /* Flags */ | |
180 | unsigned long flags; | |
181 | #define FFS_FL_CALL_CLOSED_CALLBACK 0 | |
182 | #define FFS_FL_BOUND 1 | |
183 | ||
184 | /* Active function */ | |
185 | struct ffs_function *func; | |
186 | ||
187 | /* Device name, write once when file system is mounted. | |
188 | * Intendet for user to read if she wants. */ | |
189 | const char *dev_name; | |
190 | /* Private data for our user (ie. gadget). Managed by | |
191 | * user. */ | |
192 | void *private_data; | |
193 | ||
194 | /* filled by __ffs_data_got_descs() */ | |
195 | /* real descriptors are 16 bytes after raw_descs (so you need | |
196 | * to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the | |
197 | * first full speed descriptor). raw_descs_length and | |
198 | * raw_fs_descs_length do not have those 16 bytes added. */ | |
199 | const void *raw_descs; | |
200 | unsigned raw_descs_length; | |
201 | unsigned raw_fs_descs_length; | |
202 | unsigned fs_descs_count; | |
203 | unsigned hs_descs_count; | |
204 | ||
205 | unsigned short strings_count; | |
206 | unsigned short interfaces_count; | |
207 | unsigned short eps_count; | |
208 | unsigned short _pad1; | |
209 | ||
210 | /* filled by __ffs_data_got_strings() */ | |
211 | /* ids in stringtabs are set in functionfs_bind() */ | |
212 | const void *raw_strings; | |
213 | struct usb_gadget_strings **stringtabs; | |
214 | ||
215 | /* File system's super block, write once when file system is mounted. */ | |
216 | struct super_block *sb; | |
217 | ||
218 | /* File permissions, written once when fs is mounted*/ | |
219 | struct ffs_file_perms { | |
220 | umode_t mode; | |
221 | uid_t uid; | |
222 | gid_t gid; | |
223 | } file_perms; | |
224 | ||
225 | /* The endpoint files, filled by ffs_epfiles_create(), | |
226 | * destroyed by ffs_epfiles_destroy(). */ | |
227 | struct ffs_epfile *epfiles; | |
228 | }; | |
229 | ||
230 | /* Reference counter handling */ | |
231 | static void ffs_data_get(struct ffs_data *ffs); | |
232 | static void ffs_data_put(struct ffs_data *ffs); | |
233 | /* Creates new ffs_data object. */ | |
234 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); | |
235 | ||
236 | /* Opened counter handling. */ | |
237 | static void ffs_data_opened(struct ffs_data *ffs); | |
238 | static void ffs_data_closed(struct ffs_data *ffs); | |
239 | ||
240 | /* Called with ffs->mutex held; take over ownerrship of data. */ | |
241 | static int __must_check | |
242 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); | |
243 | static int __must_check | |
244 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); | |
245 | ||
246 | ||
247 | /* The function structure ***************************************************/ | |
248 | ||
249 | struct ffs_ep; | |
250 | ||
251 | struct ffs_function { | |
252 | struct usb_configuration *conf; | |
253 | struct usb_gadget *gadget; | |
254 | struct ffs_data *ffs; | |
255 | ||
256 | struct ffs_ep *eps; | |
257 | u8 eps_revmap[16]; | |
258 | short *interfaces_nums; | |
259 | ||
260 | struct usb_function function; | |
261 | }; | |
262 | ||
263 | ||
264 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) | |
265 | { | |
266 | return container_of(f, struct ffs_function, function); | |
267 | } | |
268 | ||
269 | static void ffs_func_free(struct ffs_function *func); | |
270 | ||
271 | ||
272 | static void ffs_func_eps_disable(struct ffs_function *func); | |
273 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); | |
274 | ||
275 | ||
276 | static int ffs_func_bind(struct usb_configuration *, | |
277 | struct usb_function *); | |
278 | static void ffs_func_unbind(struct usb_configuration *, | |
279 | struct usb_function *); | |
280 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); | |
281 | static void ffs_func_disable(struct usb_function *); | |
282 | static int ffs_func_setup(struct usb_function *, | |
283 | const struct usb_ctrlrequest *); | |
284 | static void ffs_func_suspend(struct usb_function *); | |
285 | static void ffs_func_resume(struct usb_function *); | |
286 | ||
287 | ||
288 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); | |
289 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); | |
290 | ||
291 | ||
292 | ||
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 | ||
325 | ||
326 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); | |
327 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); | |
328 | ||
329 | static struct inode *__must_check | |
330 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, | |
331 | const struct file_operations *fops, | |
332 | struct dentry **dentry_p); | |
333 | ||
334 | ||
335 | /* Misc helper functions ****************************************************/ | |
336 | ||
337 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
338 | __attribute__((warn_unused_result, nonnull)); | |
339 | static char *ffs_prepare_buffer(const char * __user buf, size_t len) | |
340 | __attribute__((warn_unused_result, nonnull)); | |
341 | ||
342 | ||
343 | /* Control file aka ep0 *****************************************************/ | |
344 | ||
345 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
346 | { | |
347 | struct ffs_data *ffs = req->context; | |
348 | ||
349 | complete_all(&ffs->ep0req_completion); | |
350 | } | |
351 | ||
352 | ||
353 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) | |
354 | { | |
355 | struct usb_request *req = ffs->ep0req; | |
356 | int ret; | |
357 | ||
358 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); | |
359 | ||
360 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
361 | ||
362 | req->buf = data; | |
363 | req->length = len; | |
364 | ||
365 | INIT_COMPLETION(ffs->ep0req_completion); | |
366 | ||
367 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); | |
368 | if (unlikely(ret < 0)) | |
369 | return ret; | |
370 | ||
371 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); | |
372 | if (unlikely(ret)) { | |
373 | usb_ep_dequeue(ffs->gadget->ep0, req); | |
374 | return -EINTR; | |
375 | } | |
376 | ||
377 | ffs->setup_state = FFS_NO_SETUP; | |
378 | return ffs->ep0req_status; | |
379 | } | |
380 | ||
381 | static int __ffs_ep0_stall(struct ffs_data *ffs) | |
382 | { | |
383 | if (ffs->ev.can_stall) { | |
384 | FVDBG("ep0 stall\n"); | |
385 | usb_ep_set_halt(ffs->gadget->ep0); | |
386 | ffs->setup_state = FFS_NO_SETUP; | |
387 | return -EL2HLT; | |
388 | } else { | |
389 | FDBG("bogus ep0 stall!\n"); | |
390 | return -ESRCH; | |
391 | } | |
392 | } | |
393 | ||
394 | ||
395 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, | |
396 | size_t len, loff_t *ptr) | |
397 | { | |
398 | struct ffs_data *ffs = file->private_data; | |
399 | ssize_t ret; | |
400 | char *data; | |
401 | ||
402 | ENTER(); | |
403 | ||
404 | /* Fast check if setup was canceled */ | |
405 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) | |
406 | return -EIDRM; | |
407 | ||
408 | /* Acquire mutex */ | |
409 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
410 | if (unlikely(ret < 0)) | |
411 | return ret; | |
412 | ||
413 | ||
414 | /* Check state */ | |
415 | switch (ffs->state) { | |
416 | case FFS_READ_DESCRIPTORS: | |
417 | case FFS_READ_STRINGS: | |
418 | /* Copy data */ | |
419 | if (unlikely(len < 16)) { | |
420 | ret = -EINVAL; | |
421 | break; | |
422 | } | |
423 | ||
424 | data = ffs_prepare_buffer(buf, len); | |
425 | if (unlikely(IS_ERR(data))) { | |
426 | ret = PTR_ERR(data); | |
427 | break; | |
428 | } | |
429 | ||
430 | /* Handle data */ | |
431 | if (ffs->state == FFS_READ_DESCRIPTORS) { | |
432 | FINFO("read descriptors"); | |
433 | ret = __ffs_data_got_descs(ffs, data, len); | |
434 | if (unlikely(ret < 0)) | |
435 | break; | |
436 | ||
437 | ffs->state = FFS_READ_STRINGS; | |
438 | ret = len; | |
439 | } else { | |
440 | FINFO("read strings"); | |
441 | ret = __ffs_data_got_strings(ffs, data, len); | |
442 | if (unlikely(ret < 0)) | |
443 | break; | |
444 | ||
445 | ret = ffs_epfiles_create(ffs); | |
446 | if (unlikely(ret)) { | |
447 | ffs->state = FFS_CLOSING; | |
448 | break; | |
449 | } | |
450 | ||
451 | ffs->state = FFS_ACTIVE; | |
452 | mutex_unlock(&ffs->mutex); | |
453 | ||
454 | ret = functionfs_ready_callback(ffs); | |
455 | if (unlikely(ret < 0)) { | |
456 | ffs->state = FFS_CLOSING; | |
457 | return ret; | |
458 | } | |
459 | ||
460 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); | |
461 | return len; | |
462 | } | |
463 | break; | |
464 | ||
465 | ||
466 | case FFS_ACTIVE: | |
467 | data = NULL; | |
468 | /* We're called from user space, we can use _irq | |
469 | * rather then _irqsave */ | |
470 | spin_lock_irq(&ffs->ev.waitq.lock); | |
471 | switch (FFS_SETUP_STATE(ffs)) { | |
472 | case FFS_SETUP_CANCELED: | |
473 | ret = -EIDRM; | |
474 | goto done_spin; | |
475 | ||
476 | case FFS_NO_SETUP: | |
477 | ret = -ESRCH; | |
478 | goto done_spin; | |
479 | ||
480 | case FFS_SETUP_PENDING: | |
481 | break; | |
482 | } | |
483 | ||
484 | /* FFS_SETUP_PENDING */ | |
485 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { | |
486 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
487 | ret = __ffs_ep0_stall(ffs); | |
488 | break; | |
489 | } | |
490 | ||
491 | /* FFS_SETUP_PENDING and not stall */ | |
492 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
493 | ||
494 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
495 | ||
496 | data = ffs_prepare_buffer(buf, len); | |
497 | if (unlikely(IS_ERR(data))) { | |
498 | ret = PTR_ERR(data); | |
499 | break; | |
500 | } | |
501 | ||
502 | spin_lock_irq(&ffs->ev.waitq.lock); | |
503 | ||
504 | /* We are guaranteed to be still in FFS_ACTIVE state | |
505 | * but the state of setup could have changed from | |
506 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELED so we need | |
507 | * to check for that. If that happened we copied data | |
508 | * from user space in vain but it's unlikely. */ | |
509 | /* For sure we are not in FFS_NO_SETUP since this is | |
510 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP | |
511 | * transition can be performed and it's protected by | |
512 | * mutex. */ | |
513 | ||
514 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) { | |
515 | ret = -EIDRM; | |
516 | done_spin: | |
517 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
518 | } else { | |
519 | /* unlocks spinlock */ | |
520 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
521 | } | |
522 | kfree(data); | |
523 | break; | |
524 | ||
525 | ||
526 | default: | |
527 | ret = -EBADFD; | |
528 | break; | |
529 | } | |
530 | ||
531 | ||
532 | mutex_unlock(&ffs->mutex); | |
533 | return ret; | |
534 | } | |
535 | ||
536 | ||
537 | ||
538 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, | |
539 | size_t n) | |
540 | { | |
541 | /* We are holding ffs->ev.waitq.lock and ffs->mutex and we need | |
542 | * to release them. */ | |
543 | ||
544 | struct usb_functionfs_event events[n]; | |
545 | unsigned i = 0; | |
546 | ||
547 | memset(events, 0, sizeof events); | |
548 | ||
549 | do { | |
550 | events[i].type = ffs->ev.types[i]; | |
551 | if (events[i].type == FUNCTIONFS_SETUP) { | |
552 | events[i].u.setup = ffs->ev.setup; | |
553 | ffs->setup_state = FFS_SETUP_PENDING; | |
554 | } | |
555 | } while (++i < n); | |
556 | ||
557 | if (n < ffs->ev.count) { | |
558 | ffs->ev.count -= n; | |
559 | memmove(ffs->ev.types, ffs->ev.types + n, | |
560 | ffs->ev.count * sizeof *ffs->ev.types); | |
561 | } else { | |
562 | ffs->ev.count = 0; | |
563 | } | |
564 | ||
565 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
566 | mutex_unlock(&ffs->mutex); | |
567 | ||
568 | return unlikely(__copy_to_user(buf, events, sizeof events)) | |
569 | ? -EFAULT : sizeof events; | |
570 | } | |
571 | ||
572 | ||
573 | static ssize_t ffs_ep0_read(struct file *file, char __user *buf, | |
574 | size_t len, loff_t *ptr) | |
575 | { | |
576 | struct ffs_data *ffs = file->private_data; | |
577 | char *data = NULL; | |
578 | size_t n; | |
579 | int ret; | |
580 | ||
581 | ENTER(); | |
582 | ||
583 | /* Fast check if setup was canceled */ | |
584 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) | |
585 | return -EIDRM; | |
586 | ||
587 | /* Acquire mutex */ | |
588 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
589 | if (unlikely(ret < 0)) | |
590 | return ret; | |
591 | ||
592 | ||
593 | /* Check state */ | |
594 | if (ffs->state != FFS_ACTIVE) { | |
595 | ret = -EBADFD; | |
596 | goto done_mutex; | |
597 | } | |
598 | ||
599 | ||
600 | /* We're called from user space, we can use _irq rather then | |
601 | * _irqsave */ | |
602 | spin_lock_irq(&ffs->ev.waitq.lock); | |
603 | ||
604 | switch (FFS_SETUP_STATE(ffs)) { | |
605 | case FFS_SETUP_CANCELED: | |
606 | ret = -EIDRM; | |
607 | break; | |
608 | ||
609 | case FFS_NO_SETUP: | |
610 | n = len / sizeof(struct usb_functionfs_event); | |
611 | if (unlikely(!n)) { | |
612 | ret = -EINVAL; | |
613 | break; | |
614 | } | |
615 | ||
616 | if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { | |
617 | ret = -EAGAIN; | |
618 | break; | |
619 | } | |
620 | ||
621 | if (unlikely(wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, ffs->ev.count))) { | |
622 | ret = -EINTR; | |
623 | break; | |
624 | } | |
625 | ||
626 | return __ffs_ep0_read_events(ffs, buf, | |
627 | min(n, (size_t)ffs->ev.count)); | |
628 | ||
629 | ||
630 | case FFS_SETUP_PENDING: | |
631 | if (ffs->ev.setup.bRequestType & USB_DIR_IN) { | |
632 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
633 | ret = __ffs_ep0_stall(ffs); | |
634 | goto done_mutex; | |
635 | } | |
636 | ||
637 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
638 | ||
639 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
640 | ||
641 | if (likely(len)) { | |
642 | data = kmalloc(len, GFP_KERNEL); | |
643 | if (unlikely(!data)) { | |
644 | ret = -ENOMEM; | |
645 | goto done_mutex; | |
646 | } | |
647 | } | |
648 | ||
649 | spin_lock_irq(&ffs->ev.waitq.lock); | |
650 | ||
651 | /* See ffs_ep0_write() */ | |
652 | if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) { | |
653 | ret = -EIDRM; | |
654 | break; | |
655 | } | |
656 | ||
657 | /* unlocks spinlock */ | |
658 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
659 | if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len))) | |
660 | ret = -EFAULT; | |
661 | goto done_mutex; | |
662 | ||
663 | default: | |
664 | ret = -EBADFD; | |
665 | break; | |
666 | } | |
667 | ||
668 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
669 | done_mutex: | |
670 | mutex_unlock(&ffs->mutex); | |
671 | kfree(data); | |
672 | return ret; | |
673 | } | |
674 | ||
675 | ||
676 | ||
677 | static int ffs_ep0_open(struct inode *inode, struct file *file) | |
678 | { | |
679 | struct ffs_data *ffs = inode->i_private; | |
680 | ||
681 | ENTER(); | |
682 | ||
683 | if (unlikely(ffs->state == FFS_CLOSING)) | |
684 | return -EBUSY; | |
685 | ||
686 | file->private_data = ffs; | |
687 | ffs_data_opened(ffs); | |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
692 | ||
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 | ||
704 | ||
705 | static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) | |
706 | { | |
707 | struct ffs_data *ffs = file->private_data; | |
708 | struct usb_gadget *gadget = ffs->gadget; | |
709 | long ret; | |
710 | ||
711 | ENTER(); | |
712 | ||
713 | if (code == FUNCTIONFS_INTERFACE_REVMAP) { | |
714 | struct ffs_function *func = ffs->func; | |
715 | ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; | |
716 | } else if (gadget->ops->ioctl) { | |
ddf8abd2 | 717 | ret = gadget->ops->ioctl(gadget, code, value); |
ddf8abd2 MN |
718 | } else { |
719 | ret = -ENOTTY; | |
720 | } | |
721 | ||
722 | return ret; | |
723 | } | |
724 | ||
725 | ||
726 | static const struct file_operations ffs_ep0_operations = { | |
727 | .owner = THIS_MODULE, | |
728 | .llseek = no_llseek, | |
729 | ||
730 | .open = ffs_ep0_open, | |
731 | .write = ffs_ep0_write, | |
732 | .read = ffs_ep0_read, | |
733 | .release = ffs_ep0_release, | |
734 | .unlocked_ioctl = ffs_ep0_ioctl, | |
735 | }; | |
736 | ||
737 | ||
738 | /* "Normal" endpoints operations ********************************************/ | |
739 | ||
740 | ||
741 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) | |
742 | { | |
743 | ENTER(); | |
744 | if (likely(req->context)) { | |
745 | struct ffs_ep *ep = _ep->driver_data; | |
746 | ep->status = req->status ? req->status : req->actual; | |
747 | complete(req->context); | |
748 | } | |
749 | } | |
750 | ||
751 | ||
752 | static ssize_t ffs_epfile_io(struct file *file, | |
753 | char __user *buf, size_t len, int read) | |
754 | { | |
755 | struct ffs_epfile *epfile = file->private_data; | |
756 | struct ffs_ep *ep; | |
757 | char *data = NULL; | |
758 | ssize_t ret; | |
759 | int halt; | |
760 | ||
761 | goto first_try; | |
762 | do { | |
763 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
764 | mutex_unlock(&epfile->mutex); | |
765 | ||
766 | first_try: | |
767 | /* Are we still active? */ | |
768 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) { | |
769 | ret = -ENODEV; | |
770 | goto error; | |
771 | } | |
772 | ||
773 | /* Wait for endpoint to be enabled */ | |
774 | ep = epfile->ep; | |
775 | if (!ep) { | |
776 | if (file->f_flags & O_NONBLOCK) { | |
777 | ret = -EAGAIN; | |
778 | goto error; | |
779 | } | |
780 | ||
781 | if (unlikely(wait_event_interruptible | |
782 | (epfile->wait, (ep = epfile->ep)))) { | |
783 | ret = -EINTR; | |
784 | goto error; | |
785 | } | |
786 | } | |
787 | ||
788 | /* Do we halt? */ | |
789 | halt = !read == !epfile->in; | |
790 | if (halt && epfile->isoc) { | |
791 | ret = -EINVAL; | |
792 | goto error; | |
793 | } | |
794 | ||
795 | /* Allocate & copy */ | |
796 | if (!halt && !data) { | |
797 | data = kzalloc(len, GFP_KERNEL); | |
798 | if (unlikely(!data)) | |
799 | return -ENOMEM; | |
800 | ||
801 | if (!read && | |
802 | unlikely(__copy_from_user(data, buf, len))) { | |
803 | ret = -EFAULT; | |
804 | goto error; | |
805 | } | |
806 | } | |
807 | ||
808 | /* We will be using request */ | |
809 | ret = ffs_mutex_lock(&epfile->mutex, | |
810 | file->f_flags & O_NONBLOCK); | |
811 | if (unlikely(ret)) | |
812 | goto error; | |
813 | ||
814 | /* We're called from user space, we can use _irq rather then | |
815 | * _irqsave */ | |
816 | spin_lock_irq(&epfile->ffs->eps_lock); | |
817 | ||
818 | /* While we were acquiring mutex endpoint got disabled | |
819 | * or changed? */ | |
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 | ||
861 | ||
862 | static ssize_t | |
863 | ffs_epfile_write(struct file *file, const char __user *buf, size_t len, | |
864 | loff_t *ptr) | |
865 | { | |
866 | ENTER(); | |
867 | ||
868 | return ffs_epfile_io(file, (char __user *)buf, len, 0); | |
869 | } | |
870 | ||
871 | static ssize_t | |
872 | ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr) | |
873 | { | |
874 | ENTER(); | |
875 | ||
876 | return ffs_epfile_io(file, buf, len, 1); | |
877 | } | |
878 | ||
879 | static int | |
880 | ffs_epfile_open(struct inode *inode, struct file *file) | |
881 | { | |
882 | struct ffs_epfile *epfile = inode->i_private; | |
883 | ||
884 | ENTER(); | |
885 | ||
886 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
887 | return -ENODEV; | |
888 | ||
889 | file->private_data = epfile; | |
890 | ffs_data_opened(epfile->ffs); | |
891 | ||
892 | return 0; | |
893 | } | |
894 | ||
895 | static int | |
896 | ffs_epfile_release(struct inode *inode, struct file *file) | |
897 | { | |
898 | struct ffs_epfile *epfile = inode->i_private; | |
899 | ||
900 | ENTER(); | |
901 | ||
902 | ffs_data_closed(epfile->ffs); | |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
907 | ||
908 | static long ffs_epfile_ioctl(struct file *file, unsigned code, | |
909 | unsigned long value) | |
910 | { | |
911 | struct ffs_epfile *epfile = file->private_data; | |
912 | int ret; | |
913 | ||
914 | ENTER(); | |
915 | ||
916 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
917 | return -ENODEV; | |
918 | ||
919 | spin_lock_irq(&epfile->ffs->eps_lock); | |
920 | if (likely(epfile->ep)) { | |
921 | switch (code) { | |
922 | case FUNCTIONFS_FIFO_STATUS: | |
923 | ret = usb_ep_fifo_status(epfile->ep->ep); | |
924 | break; | |
925 | case FUNCTIONFS_FIFO_FLUSH: | |
926 | usb_ep_fifo_flush(epfile->ep->ep); | |
927 | ret = 0; | |
928 | break; | |
929 | case FUNCTIONFS_CLEAR_HALT: | |
930 | ret = usb_ep_clear_halt(epfile->ep->ep); | |
931 | break; | |
932 | case FUNCTIONFS_ENDPOINT_REVMAP: | |
933 | ret = epfile->ep->num; | |
934 | break; | |
935 | default: | |
936 | ret = -ENOTTY; | |
937 | } | |
938 | } else { | |
939 | ret = -ENODEV; | |
940 | } | |
941 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
942 | ||
943 | return ret; | |
944 | } | |
945 | ||
946 | ||
947 | static const struct file_operations ffs_epfile_operations = { | |
948 | .owner = THIS_MODULE, | |
949 | .llseek = no_llseek, | |
950 | ||
951 | .open = ffs_epfile_open, | |
952 | .write = ffs_epfile_write, | |
953 | .read = ffs_epfile_read, | |
954 | .release = ffs_epfile_release, | |
955 | .unlocked_ioctl = ffs_epfile_ioctl, | |
956 | }; | |
957 | ||
958 | ||
959 | ||
960 | /* File system and super block operations ***********************************/ | |
961 | ||
962 | /* | |
963 | * Mounting the filesystem creates a controller file, used first for | |
964 | * function configuration then later for event monitoring. | |
965 | */ | |
966 | ||
967 | ||
968 | static struct inode *__must_check | |
969 | ffs_sb_make_inode(struct super_block *sb, void *data, | |
970 | const struct file_operations *fops, | |
971 | const struct inode_operations *iops, | |
972 | struct ffs_file_perms *perms) | |
973 | { | |
974 | struct inode *inode; | |
975 | ||
976 | ENTER(); | |
977 | ||
978 | inode = new_inode(sb); | |
979 | ||
980 | if (likely(inode)) { | |
981 | struct timespec current_time = CURRENT_TIME; | |
982 | ||
983 | inode->i_mode = perms->mode; | |
984 | inode->i_uid = perms->uid; | |
985 | inode->i_gid = perms->gid; | |
986 | inode->i_atime = current_time; | |
987 | inode->i_mtime = current_time; | |
988 | inode->i_ctime = current_time; | |
989 | inode->i_private = data; | |
990 | if (fops) | |
991 | inode->i_fop = fops; | |
992 | if (iops) | |
993 | inode->i_op = iops; | |
994 | } | |
995 | ||
996 | return inode; | |
997 | } | |
998 | ||
999 | ||
1000 | /* Create "regular" file */ | |
1001 | ||
1002 | static struct inode *ffs_sb_create_file(struct super_block *sb, | |
1003 | const char *name, void *data, | |
1004 | const struct file_operations *fops, | |
1005 | struct dentry **dentry_p) | |
1006 | { | |
1007 | struct ffs_data *ffs = sb->s_fs_info; | |
1008 | struct dentry *dentry; | |
1009 | struct inode *inode; | |
1010 | ||
1011 | ENTER(); | |
1012 | ||
1013 | dentry = d_alloc_name(sb->s_root, name); | |
1014 | if (unlikely(!dentry)) | |
1015 | return NULL; | |
1016 | ||
1017 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); | |
1018 | if (unlikely(!inode)) { | |
1019 | dput(dentry); | |
1020 | return NULL; | |
1021 | } | |
1022 | ||
1023 | d_add(dentry, inode); | |
1024 | if (dentry_p) | |
1025 | *dentry_p = dentry; | |
1026 | ||
1027 | return inode; | |
1028 | } | |
1029 | ||
1030 | ||
1031 | /* Super block */ | |
1032 | ||
1033 | static const struct super_operations ffs_sb_operations = { | |
1034 | .statfs = simple_statfs, | |
1035 | .drop_inode = generic_delete_inode, | |
1036 | }; | |
1037 | ||
1038 | struct ffs_sb_fill_data { | |
1039 | struct ffs_file_perms perms; | |
1040 | umode_t root_mode; | |
1041 | const char *dev_name; | |
1042 | }; | |
1043 | ||
1044 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) | |
1045 | { | |
1046 | struct ffs_sb_fill_data *data = _data; | |
1047 | struct inode *inode; | |
1048 | struct dentry *d; | |
1049 | struct ffs_data *ffs; | |
1050 | ||
1051 | ENTER(); | |
1052 | ||
1053 | /* Initialize data */ | |
1054 | ffs = ffs_data_new(); | |
1055 | if (unlikely(!ffs)) | |
1056 | goto enomem0; | |
1057 | ||
1058 | ffs->sb = sb; | |
1059 | ffs->dev_name = data->dev_name; | |
1060 | ffs->file_perms = data->perms; | |
1061 | ||
1062 | sb->s_fs_info = ffs; | |
1063 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1064 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1065 | sb->s_magic = FUNCTIONFS_MAGIC; | |
1066 | sb->s_op = &ffs_sb_operations; | |
1067 | sb->s_time_gran = 1; | |
1068 | ||
1069 | /* Root inode */ | |
1070 | data->perms.mode = data->root_mode; | |
1071 | inode = ffs_sb_make_inode(sb, NULL, | |
1072 | &simple_dir_operations, | |
1073 | &simple_dir_inode_operations, | |
1074 | &data->perms); | |
1075 | if (unlikely(!inode)) | |
1076 | goto enomem1; | |
1077 | d = d_alloc_root(inode); | |
1078 | if (unlikely(!d)) | |
1079 | goto enomem2; | |
1080 | sb->s_root = d; | |
1081 | ||
1082 | /* EP0 file */ | |
1083 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, | |
1084 | &ffs_ep0_operations, NULL))) | |
1085 | goto enomem3; | |
1086 | ||
1087 | return 0; | |
1088 | ||
1089 | enomem3: | |
1090 | dput(d); | |
1091 | enomem2: | |
1092 | iput(inode); | |
1093 | enomem1: | |
1094 | ffs_data_put(ffs); | |
1095 | enomem0: | |
1096 | return -ENOMEM; | |
1097 | } | |
1098 | ||
1099 | ||
1100 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) | |
1101 | { | |
1102 | ENTER(); | |
1103 | ||
1104 | if (!opts || !*opts) | |
1105 | return 0; | |
1106 | ||
1107 | for (;;) { | |
1108 | char *end, *eq, *comma; | |
1109 | unsigned long value; | |
1110 | ||
1111 | /* Option limit */ | |
1112 | comma = strchr(opts, ','); | |
1113 | if (comma) | |
1114 | *comma = 0; | |
1115 | ||
1116 | /* Value limit */ | |
1117 | eq = strchr(opts, '='); | |
1118 | if (unlikely(!eq)) { | |
1119 | FERR("'=' missing in %s", opts); | |
1120 | return -EINVAL; | |
1121 | } | |
1122 | *eq = 0; | |
1123 | ||
1124 | /* Parse value */ | |
1125 | value = simple_strtoul(eq + 1, &end, 0); | |
1126 | if (unlikely(*end != ',' && *end != 0)) { | |
1127 | FERR("%s: invalid value: %s", opts, eq + 1); | |
1128 | return -EINVAL; | |
1129 | } | |
1130 | ||
1131 | /* Interpret option */ | |
1132 | switch (eq - opts) { | |
1133 | case 5: | |
1134 | if (!memcmp(opts, "rmode", 5)) | |
1135 | data->root_mode = (value & 0555) | S_IFDIR; | |
1136 | else if (!memcmp(opts, "fmode", 5)) | |
1137 | data->perms.mode = (value & 0666) | S_IFREG; | |
1138 | else | |
1139 | goto invalid; | |
1140 | break; | |
1141 | ||
1142 | case 4: | |
1143 | if (!memcmp(opts, "mode", 4)) { | |
1144 | data->root_mode = (value & 0555) | S_IFDIR; | |
1145 | data->perms.mode = (value & 0666) | S_IFREG; | |
1146 | } else { | |
1147 | goto invalid; | |
1148 | } | |
1149 | break; | |
1150 | ||
1151 | case 3: | |
1152 | if (!memcmp(opts, "uid", 3)) | |
1153 | data->perms.uid = value; | |
1154 | else if (!memcmp(opts, "gid", 3)) | |
1155 | data->perms.gid = value; | |
1156 | else | |
1157 | goto invalid; | |
1158 | break; | |
1159 | ||
1160 | default: | |
1161 | invalid: | |
1162 | FERR("%s: invalid option", opts); | |
1163 | return -EINVAL; | |
1164 | } | |
1165 | ||
1166 | /* Next iteration */ | |
1167 | if (!comma) | |
1168 | break; | |
1169 | opts = comma + 1; | |
1170 | } | |
1171 | ||
1172 | return 0; | |
1173 | } | |
1174 | ||
1175 | ||
1176 | /* "mount -t functionfs dev_name /dev/function" ends up here */ | |
1177 | ||
1178 | static int | |
1179 | ffs_fs_get_sb(struct file_system_type *t, int flags, | |
1180 | const char *dev_name, void *opts, struct vfsmount *mnt) | |
1181 | { | |
1182 | struct ffs_sb_fill_data data = { | |
1183 | .perms = { | |
1184 | .mode = S_IFREG | 0600, | |
1185 | .uid = 0, | |
1186 | .gid = 0 | |
1187 | }, | |
1188 | .root_mode = S_IFDIR | 0500, | |
1189 | }; | |
1190 | int ret; | |
1191 | ||
1192 | ENTER(); | |
1193 | ||
1194 | ret = functionfs_check_dev_callback(dev_name); | |
1195 | if (unlikely(ret < 0)) | |
1196 | return ret; | |
1197 | ||
1198 | ret = ffs_fs_parse_opts(&data, opts); | |
1199 | if (unlikely(ret < 0)) | |
1200 | return ret; | |
1201 | ||
1202 | data.dev_name = dev_name; | |
1203 | return get_sb_single(t, flags, &data, ffs_sb_fill, mnt); | |
1204 | } | |
1205 | ||
1206 | static void | |
1207 | ffs_fs_kill_sb(struct super_block *sb) | |
1208 | { | |
1209 | void *ptr; | |
1210 | ||
1211 | ENTER(); | |
1212 | ||
1213 | kill_litter_super(sb); | |
1214 | ptr = xchg(&sb->s_fs_info, NULL); | |
1215 | if (ptr) | |
1216 | ffs_data_put(ptr); | |
1217 | } | |
1218 | ||
1219 | static struct file_system_type ffs_fs_type = { | |
1220 | .owner = THIS_MODULE, | |
1221 | .name = "functionfs", | |
1222 | .get_sb = ffs_fs_get_sb, | |
1223 | .kill_sb = ffs_fs_kill_sb, | |
1224 | }; | |
1225 | ||
1226 | ||
1227 | ||
1228 | /* Driver's main init/cleanup functions *************************************/ | |
1229 | ||
1230 | ||
1231 | static int functionfs_init(void) | |
1232 | { | |
1233 | int ret; | |
1234 | ||
1235 | ENTER(); | |
1236 | ||
1237 | ret = register_filesystem(&ffs_fs_type); | |
1238 | if (likely(!ret)) | |
1239 | FINFO("file system registered"); | |
1240 | else | |
1241 | FERR("failed registering file system (%d)", ret); | |
1242 | ||
1243 | return ret; | |
1244 | } | |
1245 | ||
1246 | static void functionfs_cleanup(void) | |
1247 | { | |
1248 | ENTER(); | |
1249 | ||
1250 | FINFO("unloading"); | |
1251 | unregister_filesystem(&ffs_fs_type); | |
1252 | } | |
1253 | ||
1254 | ||
1255 | ||
1256 | /* ffs_data and ffs_function construction and destruction code **************/ | |
1257 | ||
1258 | static void ffs_data_clear(struct ffs_data *ffs); | |
1259 | static void ffs_data_reset(struct ffs_data *ffs); | |
1260 | ||
1261 | ||
1262 | static void ffs_data_get(struct ffs_data *ffs) | |
1263 | { | |
1264 | ENTER(); | |
1265 | ||
1266 | atomic_inc(&ffs->ref); | |
1267 | } | |
1268 | ||
1269 | static void ffs_data_opened(struct ffs_data *ffs) | |
1270 | { | |
1271 | ENTER(); | |
1272 | ||
1273 | atomic_inc(&ffs->ref); | |
1274 | atomic_inc(&ffs->opened); | |
1275 | } | |
1276 | ||
1277 | static void ffs_data_put(struct ffs_data *ffs) | |
1278 | { | |
1279 | ENTER(); | |
1280 | ||
1281 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { | |
1282 | FINFO("%s(): freeing", __func__); | |
1283 | ffs_data_clear(ffs); | |
1284 | BUG_ON(mutex_is_locked(&ffs->mutex) || | |
1285 | spin_is_locked(&ffs->ev.waitq.lock) || | |
1286 | waitqueue_active(&ffs->ev.waitq) || | |
1287 | waitqueue_active(&ffs->ep0req_completion.wait)); | |
1288 | kfree(ffs); | |
1289 | } | |
1290 | } | |
1291 | ||
1292 | ||
1293 | ||
1294 | static void ffs_data_closed(struct ffs_data *ffs) | |
1295 | { | |
1296 | ENTER(); | |
1297 | ||
1298 | if (atomic_dec_and_test(&ffs->opened)) { | |
1299 | ffs->state = FFS_CLOSING; | |
1300 | ffs_data_reset(ffs); | |
1301 | } | |
1302 | ||
1303 | ffs_data_put(ffs); | |
1304 | } | |
1305 | ||
1306 | ||
1307 | static struct ffs_data *ffs_data_new(void) | |
1308 | { | |
1309 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); | |
1310 | if (unlikely(!ffs)) | |
1311 | return 0; | |
1312 | ||
1313 | ENTER(); | |
1314 | ||
1315 | atomic_set(&ffs->ref, 1); | |
1316 | atomic_set(&ffs->opened, 0); | |
1317 | ffs->state = FFS_READ_DESCRIPTORS; | |
1318 | mutex_init(&ffs->mutex); | |
1319 | spin_lock_init(&ffs->eps_lock); | |
1320 | init_waitqueue_head(&ffs->ev.waitq); | |
1321 | init_completion(&ffs->ep0req_completion); | |
1322 | ||
1323 | /* XXX REVISIT need to update it in some places, or do we? */ | |
1324 | ffs->ev.can_stall = 1; | |
1325 | ||
1326 | return ffs; | |
1327 | } | |
1328 | ||
1329 | ||
1330 | static void ffs_data_clear(struct ffs_data *ffs) | |
1331 | { | |
1332 | ENTER(); | |
1333 | ||
1334 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags)) | |
1335 | functionfs_closed_callback(ffs); | |
1336 | ||
1337 | BUG_ON(ffs->gadget); | |
1338 | ||
1339 | if (ffs->epfiles) | |
1340 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); | |
1341 | ||
1342 | kfree(ffs->raw_descs); | |
1343 | kfree(ffs->raw_strings); | |
1344 | kfree(ffs->stringtabs); | |
1345 | } | |
1346 | ||
1347 | ||
1348 | static void ffs_data_reset(struct ffs_data *ffs) | |
1349 | { | |
1350 | ENTER(); | |
1351 | ||
1352 | ffs_data_clear(ffs); | |
1353 | ||
1354 | ffs->epfiles = NULL; | |
1355 | ffs->raw_descs = NULL; | |
1356 | ffs->raw_strings = NULL; | |
1357 | ffs->stringtabs = NULL; | |
1358 | ||
1359 | ffs->raw_descs_length = 0; | |
1360 | ffs->raw_fs_descs_length = 0; | |
1361 | ffs->fs_descs_count = 0; | |
1362 | ffs->hs_descs_count = 0; | |
1363 | ||
1364 | ffs->strings_count = 0; | |
1365 | ffs->interfaces_count = 0; | |
1366 | ffs->eps_count = 0; | |
1367 | ||
1368 | ffs->ev.count = 0; | |
1369 | ||
1370 | ffs->state = FFS_READ_DESCRIPTORS; | |
1371 | ffs->setup_state = FFS_NO_SETUP; | |
1372 | ffs->flags = 0; | |
1373 | } | |
1374 | ||
1375 | ||
1376 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) | |
1377 | { | |
fd7c9a00 MN |
1378 | struct usb_gadget_strings **lang; |
1379 | int first_id; | |
ddf8abd2 MN |
1380 | |
1381 | ENTER(); | |
1382 | ||
1383 | if (WARN_ON(ffs->state != FFS_ACTIVE | |
1384 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) | |
1385 | return -EBADFD; | |
1386 | ||
fd7c9a00 MN |
1387 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
1388 | if (unlikely(first_id < 0)) | |
1389 | return first_id; | |
ddf8abd2 MN |
1390 | |
1391 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); | |
1392 | if (unlikely(!ffs->ep0req)) | |
1393 | return -ENOMEM; | |
1394 | ffs->ep0req->complete = ffs_ep0_complete; | |
1395 | ffs->ep0req->context = ffs; | |
1396 | ||
fd7c9a00 MN |
1397 | lang = ffs->stringtabs; |
1398 | for (lang = ffs->stringtabs; *lang; ++lang) { | |
1399 | struct usb_string *str = (*lang)->strings; | |
1400 | int id = first_id; | |
1401 | for (; str->s; ++id, ++str) | |
1402 | str->id = id; | |
ddf8abd2 MN |
1403 | } |
1404 | ||
1405 | ffs->gadget = cdev->gadget; | |
fd7c9a00 | 1406 | ffs_data_get(ffs); |
ddf8abd2 MN |
1407 | return 0; |
1408 | } | |
1409 | ||
1410 | ||
1411 | static void functionfs_unbind(struct ffs_data *ffs) | |
1412 | { | |
1413 | ENTER(); | |
1414 | ||
1415 | if (!WARN_ON(!ffs->gadget)) { | |
1416 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); | |
1417 | ffs->ep0req = NULL; | |
1418 | ffs->gadget = NULL; | |
1419 | ffs_data_put(ffs); | |
1420 | } | |
1421 | } | |
1422 | ||
1423 | ||
1424 | static int ffs_epfiles_create(struct ffs_data *ffs) | |
1425 | { | |
1426 | struct ffs_epfile *epfile, *epfiles; | |
1427 | unsigned i, count; | |
1428 | ||
1429 | ENTER(); | |
1430 | ||
1431 | count = ffs->eps_count; | |
1432 | epfiles = kzalloc(count * sizeof *epfiles, GFP_KERNEL); | |
1433 | if (!epfiles) | |
1434 | return -ENOMEM; | |
1435 | ||
1436 | epfile = epfiles; | |
1437 | for (i = 1; i <= count; ++i, ++epfile) { | |
1438 | epfile->ffs = ffs; | |
1439 | mutex_init(&epfile->mutex); | |
1440 | init_waitqueue_head(&epfile->wait); | |
1441 | sprintf(epfiles->name, "ep%u", i); | |
1442 | if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile, | |
1443 | &ffs_epfile_operations, | |
1444 | &epfile->dentry))) { | |
1445 | ffs_epfiles_destroy(epfiles, i - 1); | |
1446 | return -ENOMEM; | |
1447 | } | |
1448 | } | |
1449 | ||
1450 | ffs->epfiles = epfiles; | |
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | ||
1455 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) | |
1456 | { | |
1457 | struct ffs_epfile *epfile = epfiles; | |
1458 | ||
1459 | ENTER(); | |
1460 | ||
1461 | for (; count; --count, ++epfile) { | |
1462 | BUG_ON(mutex_is_locked(&epfile->mutex) || | |
1463 | waitqueue_active(&epfile->wait)); | |
1464 | if (epfile->dentry) { | |
1465 | d_delete(epfile->dentry); | |
1466 | dput(epfile->dentry); | |
1467 | epfile->dentry = NULL; | |
1468 | } | |
1469 | } | |
1470 | ||
1471 | kfree(epfiles); | |
1472 | } | |
1473 | ||
1474 | ||
7898aee1 MN |
1475 | static int functionfs_bind_config(struct usb_composite_dev *cdev, |
1476 | struct usb_configuration *c, | |
1477 | struct ffs_data *ffs) | |
ddf8abd2 MN |
1478 | { |
1479 | struct ffs_function *func; | |
1480 | int ret; | |
1481 | ||
1482 | ENTER(); | |
1483 | ||
1484 | func = kzalloc(sizeof *func, GFP_KERNEL); | |
1485 | if (unlikely(!func)) | |
1486 | return -ENOMEM; | |
1487 | ||
1488 | func->function.name = "Function FS Gadget"; | |
1489 | func->function.strings = ffs->stringtabs; | |
1490 | ||
1491 | func->function.bind = ffs_func_bind; | |
1492 | func->function.unbind = ffs_func_unbind; | |
1493 | func->function.set_alt = ffs_func_set_alt; | |
1494 | /*func->function.get_alt = ffs_func_get_alt;*/ | |
1495 | func->function.disable = ffs_func_disable; | |
1496 | func->function.setup = ffs_func_setup; | |
1497 | func->function.suspend = ffs_func_suspend; | |
1498 | func->function.resume = ffs_func_resume; | |
1499 | ||
1500 | func->conf = c; | |
1501 | func->gadget = cdev->gadget; | |
1502 | func->ffs = ffs; | |
1503 | ffs_data_get(ffs); | |
1504 | ||
1505 | ret = usb_add_function(c, &func->function); | |
1506 | if (unlikely(ret)) | |
1507 | ffs_func_free(func); | |
1508 | ||
1509 | return ret; | |
1510 | } | |
1511 | ||
1512 | static void ffs_func_free(struct ffs_function *func) | |
1513 | { | |
1514 | ENTER(); | |
1515 | ||
1516 | ffs_data_put(func->ffs); | |
1517 | ||
1518 | kfree(func->eps); | |
1519 | /* eps and interfaces_nums are allocated in the same chunk so | |
1520 | * only one free is required. Descriptors are also allocated | |
1521 | * in the same chunk. */ | |
1522 | ||
1523 | kfree(func); | |
1524 | } | |
1525 | ||
1526 | ||
1527 | static void ffs_func_eps_disable(struct ffs_function *func) | |
1528 | { | |
1529 | struct ffs_ep *ep = func->eps; | |
1530 | struct ffs_epfile *epfile = func->ffs->epfiles; | |
1531 | unsigned count = func->ffs->eps_count; | |
1532 | unsigned long flags; | |
1533 | ||
1534 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1535 | do { | |
1536 | /* pending requests get nuked */ | |
1537 | if (likely(ep->ep)) | |
1538 | usb_ep_disable(ep->ep); | |
1539 | epfile->ep = NULL; | |
1540 | ||
1541 | ++ep; | |
1542 | ++epfile; | |
1543 | } while (--count); | |
1544 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1545 | } | |
1546 | ||
1547 | static int ffs_func_eps_enable(struct ffs_function *func) | |
1548 | { | |
1549 | struct ffs_data *ffs = func->ffs; | |
1550 | struct ffs_ep *ep = func->eps; | |
1551 | struct ffs_epfile *epfile = ffs->epfiles; | |
1552 | unsigned count = ffs->eps_count; | |
1553 | unsigned long flags; | |
1554 | int ret = 0; | |
1555 | ||
1556 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1557 | do { | |
1558 | struct usb_endpoint_descriptor *ds; | |
1559 | ds = ep->descs[ep->descs[1] ? 1 : 0]; | |
1560 | ||
1561 | ep->ep->driver_data = ep; | |
1562 | ret = usb_ep_enable(ep->ep, ds); | |
1563 | if (likely(!ret)) { | |
1564 | epfile->ep = ep; | |
1565 | epfile->in = usb_endpoint_dir_in(ds); | |
1566 | epfile->isoc = usb_endpoint_xfer_isoc(ds); | |
1567 | } else { | |
1568 | break; | |
1569 | } | |
1570 | ||
1571 | wake_up(&epfile->wait); | |
1572 | ||
1573 | ++ep; | |
1574 | ++epfile; | |
1575 | } while (--count); | |
1576 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1577 | ||
1578 | return ret; | |
1579 | } | |
1580 | ||
1581 | ||
1582 | /* Parsing and building descriptors and strings *****************************/ | |
1583 | ||
1584 | ||
1585 | /* This validates if data pointed by data is a valid USB descriptor as | |
1586 | * well as record how many interfaces, endpoints and strings are | |
1587 | * required by given configuration. Returns address afther the | |
1588 | * descriptor or NULL if data is invalid. */ | |
1589 | ||
1590 | enum ffs_entity_type { | |
1591 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT | |
1592 | }; | |
1593 | ||
1594 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, | |
1595 | u8 *valuep, | |
1596 | struct usb_descriptor_header *desc, | |
1597 | void *priv); | |
1598 | ||
1599 | static int __must_check ffs_do_desc(char *data, unsigned len, | |
1600 | ffs_entity_callback entity, void *priv) | |
1601 | { | |
1602 | struct usb_descriptor_header *_ds = (void *)data; | |
1603 | u8 length; | |
1604 | int ret; | |
1605 | ||
1606 | ENTER(); | |
1607 | ||
1608 | /* At least two bytes are required: length and type */ | |
1609 | if (len < 2) { | |
1610 | FVDBG("descriptor too short"); | |
1611 | return -EINVAL; | |
1612 | } | |
1613 | ||
1614 | /* If we have at least as many bytes as the descriptor takes? */ | |
1615 | length = _ds->bLength; | |
1616 | if (len < length) { | |
1617 | FVDBG("descriptor longer then available data"); | |
1618 | return -EINVAL; | |
1619 | } | |
1620 | ||
1621 | #define __entity_check_INTERFACE(val) 1 | |
1622 | #define __entity_check_STRING(val) (val) | |
1623 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) | |
1624 | #define __entity(type, val) do { \ | |
1625 | FVDBG("entity " #type "(%02x)", (val)); \ | |
1626 | if (unlikely(!__entity_check_ ##type(val))) { \ | |
1627 | FVDBG("invalid entity's value"); \ | |
1628 | return -EINVAL; \ | |
1629 | } \ | |
1630 | ret = entity(FFS_ ##type, &val, _ds, priv); \ | |
1631 | if (unlikely(ret < 0)) { \ | |
1632 | FDBG("entity " #type "(%02x); ret = %d", \ | |
1633 | (val), ret); \ | |
1634 | return ret; \ | |
1635 | } \ | |
1636 | } while (0) | |
1637 | ||
1638 | /* Parse descriptor depending on type. */ | |
1639 | switch (_ds->bDescriptorType) { | |
1640 | case USB_DT_DEVICE: | |
1641 | case USB_DT_CONFIG: | |
1642 | case USB_DT_STRING: | |
1643 | case USB_DT_DEVICE_QUALIFIER: | |
1644 | /* function can't have any of those */ | |
1645 | FVDBG("descriptor reserved for gadget: %d", _ds->bDescriptorType); | |
1646 | return -EINVAL; | |
1647 | ||
1648 | case USB_DT_INTERFACE: { | |
1649 | struct usb_interface_descriptor *ds = (void *)_ds; | |
1650 | FVDBG("interface descriptor"); | |
1651 | if (length != sizeof *ds) | |
1652 | goto inv_length; | |
1653 | ||
1654 | __entity(INTERFACE, ds->bInterfaceNumber); | |
1655 | if (ds->iInterface) | |
1656 | __entity(STRING, ds->iInterface); | |
1657 | } | |
1658 | break; | |
1659 | ||
1660 | case USB_DT_ENDPOINT: { | |
1661 | struct usb_endpoint_descriptor *ds = (void *)_ds; | |
1662 | FVDBG("endpoint descriptor"); | |
1663 | if (length != USB_DT_ENDPOINT_SIZE && | |
1664 | length != USB_DT_ENDPOINT_AUDIO_SIZE) | |
1665 | goto inv_length; | |
1666 | __entity(ENDPOINT, ds->bEndpointAddress); | |
1667 | } | |
1668 | break; | |
1669 | ||
1670 | case USB_DT_OTG: | |
1671 | if (length != sizeof(struct usb_otg_descriptor)) | |
1672 | goto inv_length; | |
1673 | break; | |
1674 | ||
1675 | case USB_DT_INTERFACE_ASSOCIATION: { | |
1676 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; | |
1677 | FVDBG("interface association descriptor"); | |
1678 | if (length != sizeof *ds) | |
1679 | goto inv_length; | |
1680 | if (ds->iFunction) | |
1681 | __entity(STRING, ds->iFunction); | |
1682 | } | |
1683 | break; | |
1684 | ||
1685 | case USB_DT_OTHER_SPEED_CONFIG: | |
1686 | case USB_DT_INTERFACE_POWER: | |
1687 | case USB_DT_DEBUG: | |
1688 | case USB_DT_SECURITY: | |
1689 | case USB_DT_CS_RADIO_CONTROL: | |
1690 | /* TODO */ | |
1691 | FVDBG("unimplemented descriptor: %d", _ds->bDescriptorType); | |
1692 | return -EINVAL; | |
1693 | ||
1694 | default: | |
1695 | /* We should never be here */ | |
1696 | FVDBG("unknown descriptor: %d", _ds->bDescriptorType); | |
1697 | return -EINVAL; | |
1698 | ||
1699 | inv_length: | |
1700 | FVDBG("invalid length: %d (descriptor %d)", | |
1701 | _ds->bLength, _ds->bDescriptorType); | |
1702 | return -EINVAL; | |
1703 | } | |
1704 | ||
1705 | #undef __entity | |
1706 | #undef __entity_check_DESCRIPTOR | |
1707 | #undef __entity_check_INTERFACE | |
1708 | #undef __entity_check_STRING | |
1709 | #undef __entity_check_ENDPOINT | |
1710 | ||
1711 | return length; | |
1712 | } | |
1713 | ||
1714 | ||
1715 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, | |
1716 | ffs_entity_callback entity, void *priv) | |
1717 | { | |
1718 | const unsigned _len = len; | |
1719 | unsigned long num = 0; | |
1720 | ||
1721 | ENTER(); | |
1722 | ||
1723 | for (;;) { | |
1724 | int ret; | |
1725 | ||
1726 | if (num == count) | |
1727 | data = NULL; | |
1728 | ||
1729 | /* Record "descriptor" entitny */ | |
1730 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); | |
1731 | if (unlikely(ret < 0)) { | |
1732 | FDBG("entity DESCRIPTOR(%02lx); ret = %d", num, ret); | |
1733 | return ret; | |
1734 | } | |
1735 | ||
1736 | if (!data) | |
1737 | return _len - len; | |
1738 | ||
1739 | ret = ffs_do_desc(data, len, entity, priv); | |
1740 | if (unlikely(ret < 0)) { | |
1741 | FDBG("%s returns %d", __func__, ret); | |
1742 | return ret; | |
1743 | } | |
1744 | ||
1745 | len -= ret; | |
1746 | data += ret; | |
1747 | ++num; | |
1748 | } | |
1749 | } | |
1750 | ||
1751 | ||
1752 | static int __ffs_data_do_entity(enum ffs_entity_type type, | |
1753 | u8 *valuep, struct usb_descriptor_header *desc, | |
1754 | void *priv) | |
1755 | { | |
1756 | struct ffs_data *ffs = priv; | |
1757 | ||
1758 | ENTER(); | |
1759 | ||
1760 | switch (type) { | |
1761 | case FFS_DESCRIPTOR: | |
1762 | break; | |
1763 | ||
1764 | case FFS_INTERFACE: | |
1765 | /* Interfaces are indexed from zero so if we | |
1766 | * encountered interface "n" then there are at least | |
1767 | * "n+1" interfaces. */ | |
1768 | if (*valuep >= ffs->interfaces_count) | |
1769 | ffs->interfaces_count = *valuep + 1; | |
1770 | break; | |
1771 | ||
1772 | case FFS_STRING: | |
1773 | /* Strings are indexed from 1 (0 is magic ;) reserved | |
1774 | * for languages list or some such) */ | |
1775 | if (*valuep > ffs->strings_count) | |
1776 | ffs->strings_count = *valuep; | |
1777 | break; | |
1778 | ||
1779 | case FFS_ENDPOINT: | |
1780 | /* Endpoints are indexed from 1 as well. */ | |
1781 | if ((*valuep & USB_ENDPOINT_NUMBER_MASK) > ffs->eps_count) | |
1782 | ffs->eps_count = (*valuep & USB_ENDPOINT_NUMBER_MASK); | |
1783 | break; | |
1784 | } | |
1785 | ||
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | ||
1790 | static int __ffs_data_got_descs(struct ffs_data *ffs, | |
1791 | char *const _data, size_t len) | |
1792 | { | |
1793 | unsigned fs_count, hs_count; | |
1794 | int fs_len, ret = -EINVAL; | |
1795 | char *data = _data; | |
1796 | ||
1797 | ENTER(); | |
1798 | ||
1799 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_DESCRIPTORS_MAGIC || | |
1800 | get_unaligned_le32(data + 4) != len)) | |
1801 | goto error; | |
1802 | fs_count = get_unaligned_le32(data + 8); | |
1803 | hs_count = get_unaligned_le32(data + 12); | |
1804 | ||
1805 | if (!fs_count && !hs_count) | |
1806 | goto einval; | |
1807 | ||
1808 | data += 16; | |
1809 | len -= 16; | |
1810 | ||
1811 | if (likely(fs_count)) { | |
1812 | fs_len = ffs_do_descs(fs_count, data, len, | |
1813 | __ffs_data_do_entity, ffs); | |
1814 | if (unlikely(fs_len < 0)) { | |
1815 | ret = fs_len; | |
1816 | goto error; | |
1817 | } | |
1818 | ||
1819 | data += fs_len; | |
1820 | len -= fs_len; | |
1821 | } else { | |
1822 | fs_len = 0; | |
1823 | } | |
1824 | ||
1825 | if (likely(hs_count)) { | |
1826 | ret = ffs_do_descs(hs_count, data, len, | |
1827 | __ffs_data_do_entity, ffs); | |
1828 | if (unlikely(ret < 0)) | |
1829 | goto error; | |
1830 | } else { | |
1831 | ret = 0; | |
1832 | } | |
1833 | ||
1834 | if (unlikely(len != ret)) | |
1835 | goto einval; | |
1836 | ||
1837 | ffs->raw_fs_descs_length = fs_len; | |
1838 | ffs->raw_descs_length = fs_len + ret; | |
1839 | ffs->raw_descs = _data; | |
1840 | ffs->fs_descs_count = fs_count; | |
1841 | ffs->hs_descs_count = hs_count; | |
1842 | ||
1843 | return 0; | |
1844 | ||
1845 | einval: | |
1846 | ret = -EINVAL; | |
1847 | error: | |
1848 | kfree(_data); | |
1849 | return ret; | |
1850 | } | |
1851 | ||
1852 | ||
1853 | ||
1854 | static int __ffs_data_got_strings(struct ffs_data *ffs, | |
1855 | char *const _data, size_t len) | |
1856 | { | |
1857 | u32 str_count, needed_count, lang_count; | |
1858 | struct usb_gadget_strings **stringtabs, *t; | |
1859 | struct usb_string *strings, *s; | |
1860 | const char *data = _data; | |
1861 | ||
1862 | ENTER(); | |
1863 | ||
1864 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || | |
1865 | get_unaligned_le32(data + 4) != len)) | |
1866 | goto error; | |
1867 | str_count = get_unaligned_le32(data + 8); | |
1868 | lang_count = get_unaligned_le32(data + 12); | |
1869 | ||
1870 | /* if one is zero the other must be zero */ | |
1871 | if (unlikely(!str_count != !lang_count)) | |
1872 | goto error; | |
1873 | ||
1874 | /* Do we have at least as many strings as descriptors need? */ | |
1875 | needed_count = ffs->strings_count; | |
1876 | if (unlikely(str_count < needed_count)) | |
1877 | goto error; | |
1878 | ||
1879 | /* If we don't need any strings just return and free all | |
1880 | * memory */ | |
1881 | if (!needed_count) { | |
1882 | kfree(_data); | |
1883 | return 0; | |
1884 | } | |
1885 | ||
1886 | /* Allocate */ | |
1887 | { | |
1888 | /* Allocate everything in one chunk so there's less | |
1889 | * maintanance. */ | |
1890 | struct { | |
1891 | struct usb_gadget_strings *stringtabs[lang_count + 1]; | |
1892 | struct usb_gadget_strings stringtab[lang_count]; | |
1893 | struct usb_string strings[lang_count*(needed_count+1)]; | |
1894 | } *d; | |
1895 | unsigned i = 0; | |
1896 | ||
1897 | d = kmalloc(sizeof *d, GFP_KERNEL); | |
1898 | if (unlikely(!d)) { | |
1899 | kfree(_data); | |
1900 | return -ENOMEM; | |
1901 | } | |
1902 | ||
1903 | stringtabs = d->stringtabs; | |
1904 | t = d->stringtab; | |
1905 | i = lang_count; | |
1906 | do { | |
1907 | *stringtabs++ = t++; | |
1908 | } while (--i); | |
1909 | *stringtabs = NULL; | |
1910 | ||
1911 | stringtabs = d->stringtabs; | |
1912 | t = d->stringtab; | |
1913 | s = d->strings; | |
1914 | strings = s; | |
1915 | } | |
1916 | ||
1917 | /* For each language */ | |
1918 | data += 16; | |
1919 | len -= 16; | |
1920 | ||
1921 | do { /* lang_count > 0 so we can use do-while */ | |
1922 | unsigned needed = needed_count; | |
1923 | ||
1924 | if (unlikely(len < 3)) | |
1925 | goto error_free; | |
1926 | t->language = get_unaligned_le16(data); | |
1927 | t->strings = s; | |
1928 | ++t; | |
1929 | ||
1930 | data += 2; | |
1931 | len -= 2; | |
1932 | ||
1933 | /* For each string */ | |
1934 | do { /* str_count > 0 so we can use do-while */ | |
1935 | size_t length = strnlen(data, len); | |
1936 | ||
1937 | if (unlikely(length == len)) | |
1938 | goto error_free; | |
1939 | ||
1940 | /* user may provide more strings then we need, | |
1941 | * if that's the case we simply ingore the | |
1942 | * rest */ | |
1943 | if (likely(needed)) { | |
1944 | /* s->id will be set while adding | |
1945 | * function to configuration so for | |
1946 | * now just leave garbage here. */ | |
1947 | s->s = data; | |
1948 | --needed; | |
1949 | ++s; | |
1950 | } | |
1951 | ||
1952 | data += length + 1; | |
1953 | len -= length + 1; | |
1954 | } while (--str_count); | |
1955 | ||
1956 | s->id = 0; /* terminator */ | |
1957 | s->s = NULL; | |
1958 | ++s; | |
1959 | ||
1960 | } while (--lang_count); | |
1961 | ||
1962 | /* Some garbage left? */ | |
1963 | if (unlikely(len)) | |
1964 | goto error_free; | |
1965 | ||
1966 | /* Done! */ | |
1967 | ffs->stringtabs = stringtabs; | |
1968 | ffs->raw_strings = _data; | |
1969 | ||
1970 | return 0; | |
1971 | ||
1972 | error_free: | |
1973 | kfree(stringtabs); | |
1974 | error: | |
1975 | kfree(_data); | |
1976 | return -EINVAL; | |
1977 | } | |
1978 | ||
1979 | ||
1980 | ||
1981 | ||
1982 | /* Events handling and management *******************************************/ | |
1983 | ||
1984 | static void __ffs_event_add(struct ffs_data *ffs, | |
1985 | enum usb_functionfs_event_type type) | |
1986 | { | |
1987 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; | |
1988 | int neg = 0; | |
1989 | ||
1990 | /* Abort any unhandled setup */ | |
1991 | /* We do not need to worry about some cmpxchg() changing value | |
1992 | * of ffs->setup_state without holding the lock because when | |
1993 | * state is FFS_SETUP_PENDING cmpxchg() in several places in | |
1994 | * the source does nothing. */ | |
1995 | if (ffs->setup_state == FFS_SETUP_PENDING) | |
1996 | ffs->setup_state = FFS_SETUP_CANCELED; | |
1997 | ||
1998 | switch (type) { | |
1999 | case FUNCTIONFS_RESUME: | |
2000 | rem_type2 = FUNCTIONFS_SUSPEND; | |
2001 | /* FALL THGOUTH */ | |
2002 | case FUNCTIONFS_SUSPEND: | |
2003 | case FUNCTIONFS_SETUP: | |
2004 | rem_type1 = type; | |
2005 | /* discard all similar events */ | |
2006 | break; | |
2007 | ||
2008 | case FUNCTIONFS_BIND: | |
2009 | case FUNCTIONFS_UNBIND: | |
2010 | case FUNCTIONFS_DISABLE: | |
2011 | case FUNCTIONFS_ENABLE: | |
2012 | /* discard everything other then power management. */ | |
2013 | rem_type1 = FUNCTIONFS_SUSPEND; | |
2014 | rem_type2 = FUNCTIONFS_RESUME; | |
2015 | neg = 1; | |
2016 | break; | |
2017 | ||
2018 | default: | |
2019 | BUG(); | |
2020 | } | |
2021 | ||
2022 | { | |
2023 | u8 *ev = ffs->ev.types, *out = ev; | |
2024 | unsigned n = ffs->ev.count; | |
2025 | for (; n; --n, ++ev) | |
2026 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) | |
2027 | *out++ = *ev; | |
2028 | else | |
2029 | FVDBG("purging event %d", *ev); | |
2030 | ffs->ev.count = out - ffs->ev.types; | |
2031 | } | |
2032 | ||
2033 | FVDBG("adding event %d", type); | |
2034 | ffs->ev.types[ffs->ev.count++] = type; | |
2035 | wake_up_locked(&ffs->ev.waitq); | |
2036 | } | |
2037 | ||
2038 | static void ffs_event_add(struct ffs_data *ffs, | |
2039 | enum usb_functionfs_event_type type) | |
2040 | { | |
2041 | unsigned long flags; | |
2042 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2043 | __ffs_event_add(ffs, type); | |
2044 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2045 | } | |
2046 | ||
2047 | ||
2048 | /* Bind/unbind USB function hooks *******************************************/ | |
2049 | ||
2050 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, | |
2051 | struct usb_descriptor_header *desc, | |
2052 | void *priv) | |
2053 | { | |
2054 | struct usb_endpoint_descriptor *ds = (void *)desc; | |
2055 | struct ffs_function *func = priv; | |
2056 | struct ffs_ep *ffs_ep; | |
2057 | ||
2058 | /* If hs_descriptors is not NULL then we are reading hs | |
2059 | * descriptors now */ | |
2060 | const int isHS = func->function.hs_descriptors != NULL; | |
2061 | unsigned idx; | |
2062 | ||
2063 | if (type != FFS_DESCRIPTOR) | |
2064 | return 0; | |
2065 | ||
2066 | if (isHS) | |
2067 | func->function.hs_descriptors[(long)valuep] = desc; | |
2068 | else | |
2069 | func->function.descriptors[(long)valuep] = desc; | |
2070 | ||
2071 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) | |
2072 | return 0; | |
2073 | ||
2074 | idx = (ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2075 | ffs_ep = func->eps + idx; | |
2076 | ||
2077 | if (unlikely(ffs_ep->descs[isHS])) { | |
2078 | FVDBG("two %sspeed descriptors for EP %d", | |
2079 | isHS ? "high" : "full", | |
2080 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
2081 | return -EINVAL; | |
2082 | } | |
2083 | ffs_ep->descs[isHS] = ds; | |
2084 | ||
2085 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); | |
2086 | if (ffs_ep->ep) { | |
2087 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; | |
2088 | if (!ds->wMaxPacketSize) | |
2089 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; | |
2090 | } else { | |
2091 | struct usb_request *req; | |
2092 | struct usb_ep *ep; | |
2093 | ||
2094 | FVDBG("autoconfig"); | |
2095 | ep = usb_ep_autoconfig(func->gadget, ds); | |
2096 | if (unlikely(!ep)) | |
2097 | return -ENOTSUPP; | |
2098 | ep->driver_data = func->eps + idx;; | |
2099 | ||
2100 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
2101 | if (unlikely(!req)) | |
2102 | return -ENOMEM; | |
2103 | ||
2104 | ffs_ep->ep = ep; | |
2105 | ffs_ep->req = req; | |
2106 | func->eps_revmap[ds->bEndpointAddress & | |
2107 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; | |
2108 | } | |
2109 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); | |
2110 | ||
2111 | return 0; | |
2112 | } | |
2113 | ||
2114 | ||
2115 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, | |
2116 | struct usb_descriptor_header *desc, | |
2117 | void *priv) | |
2118 | { | |
2119 | struct ffs_function *func = priv; | |
2120 | unsigned idx; | |
2121 | u8 newValue; | |
2122 | ||
2123 | switch (type) { | |
2124 | default: | |
2125 | case FFS_DESCRIPTOR: | |
2126 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ | |
2127 | return 0; | |
2128 | ||
2129 | case FFS_INTERFACE: | |
2130 | idx = *valuep; | |
2131 | if (func->interfaces_nums[idx] < 0) { | |
2132 | int id = usb_interface_id(func->conf, &func->function); | |
2133 | if (unlikely(id < 0)) | |
2134 | return id; | |
2135 | func->interfaces_nums[idx] = id; | |
2136 | } | |
2137 | newValue = func->interfaces_nums[idx]; | |
2138 | break; | |
2139 | ||
2140 | case FFS_STRING: | |
2141 | /* String' IDs are allocated when fsf_data is bound to cdev */ | |
2142 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; | |
2143 | break; | |
2144 | ||
2145 | case FFS_ENDPOINT: | |
2146 | /* USB_DT_ENDPOINT are handled in | |
2147 | * __ffs_func_bind_do_descs(). */ | |
2148 | if (desc->bDescriptorType == USB_DT_ENDPOINT) | |
2149 | return 0; | |
2150 | ||
2151 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2152 | if (unlikely(!func->eps[idx].ep)) | |
2153 | return -EINVAL; | |
2154 | ||
2155 | { | |
2156 | struct usb_endpoint_descriptor **descs; | |
2157 | descs = func->eps[idx].descs; | |
2158 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; | |
2159 | } | |
2160 | break; | |
2161 | } | |
2162 | ||
2163 | FVDBG("%02x -> %02x", *valuep, newValue); | |
2164 | *valuep = newValue; | |
2165 | return 0; | |
2166 | } | |
2167 | ||
2168 | static int ffs_func_bind(struct usb_configuration *c, | |
2169 | struct usb_function *f) | |
2170 | { | |
2171 | struct ffs_function *func = ffs_func_from_usb(f); | |
2172 | struct ffs_data *ffs = func->ffs; | |
2173 | ||
2174 | const int full = !!func->ffs->fs_descs_count; | |
2175 | const int high = gadget_is_dualspeed(func->gadget) && | |
2176 | func->ffs->hs_descs_count; | |
2177 | ||
2178 | int ret; | |
2179 | ||
2180 | /* Make it a single chunk, less management later on */ | |
2181 | struct { | |
2182 | struct ffs_ep eps[ffs->eps_count]; | |
2183 | struct usb_descriptor_header | |
2184 | *fs_descs[full ? ffs->fs_descs_count + 1 : 0]; | |
2185 | struct usb_descriptor_header | |
2186 | *hs_descs[high ? ffs->hs_descs_count + 1 : 0]; | |
2187 | short inums[ffs->interfaces_count]; | |
2188 | char raw_descs[high ? ffs->raw_descs_length | |
2189 | : ffs->raw_fs_descs_length]; | |
2190 | } *data; | |
2191 | ||
2192 | ENTER(); | |
2193 | ||
2194 | /* Only high speed but not supported by gadget? */ | |
2195 | if (unlikely(!(full | high))) | |
2196 | return -ENOTSUPP; | |
2197 | ||
2198 | /* Allocate */ | |
2199 | data = kmalloc(sizeof *data, GFP_KERNEL); | |
2200 | if (unlikely(!data)) | |
2201 | return -ENOMEM; | |
2202 | ||
2203 | /* Zero */ | |
2204 | memset(data->eps, 0, sizeof data->eps); | |
2205 | memcpy(data->raw_descs, ffs->raw_descs + 16, sizeof data->raw_descs); | |
2206 | memset(data->inums, 0xff, sizeof data->inums); | |
2207 | for (ret = ffs->eps_count; ret; --ret) | |
2208 | data->eps[ret].num = -1; | |
2209 | ||
2210 | /* Save pointers */ | |
2211 | func->eps = data->eps; | |
2212 | func->interfaces_nums = data->inums; | |
2213 | ||
2214 | /* Go throught all the endpoint descriptors and allocate | |
2215 | * endpoints first, so that later we can rewrite the endpoint | |
2216 | * numbers without worying that it may be described later on. */ | |
2217 | if (likely(full)) { | |
2218 | func->function.descriptors = data->fs_descs; | |
2219 | ret = ffs_do_descs(ffs->fs_descs_count, | |
2220 | data->raw_descs, | |
2221 | sizeof data->raw_descs, | |
2222 | __ffs_func_bind_do_descs, func); | |
2223 | if (unlikely(ret < 0)) | |
2224 | goto error; | |
2225 | } else { | |
2226 | ret = 0; | |
2227 | } | |
2228 | ||
2229 | if (likely(high)) { | |
2230 | func->function.hs_descriptors = data->hs_descs; | |
2231 | ret = ffs_do_descs(ffs->hs_descs_count, | |
2232 | data->raw_descs + ret, | |
2233 | (sizeof data->raw_descs) - ret, | |
2234 | __ffs_func_bind_do_descs, func); | |
2235 | } | |
2236 | ||
2237 | /* Now handle interface numbers allocation and interface and | |
2238 | * enpoint numbers rewritting. We can do that in one go | |
2239 | * now. */ | |
2240 | ret = ffs_do_descs(ffs->fs_descs_count + | |
2241 | (high ? ffs->hs_descs_count : 0), | |
2242 | data->raw_descs, sizeof data->raw_descs, | |
2243 | __ffs_func_bind_do_nums, func); | |
2244 | if (unlikely(ret < 0)) | |
2245 | goto error; | |
2246 | ||
2247 | /* And we're done */ | |
2248 | ffs_event_add(ffs, FUNCTIONFS_BIND); | |
2249 | return 0; | |
2250 | ||
2251 | error: | |
2252 | /* XXX Do we need to release all claimed endpoints here? */ | |
2253 | return ret; | |
2254 | } | |
2255 | ||
2256 | ||
2257 | /* Other USB function hooks *************************************************/ | |
2258 | ||
2259 | static void ffs_func_unbind(struct usb_configuration *c, | |
2260 | struct usb_function *f) | |
2261 | { | |
2262 | struct ffs_function *func = ffs_func_from_usb(f); | |
2263 | struct ffs_data *ffs = func->ffs; | |
2264 | ||
2265 | ENTER(); | |
2266 | ||
2267 | if (ffs->func == func) { | |
2268 | ffs_func_eps_disable(func); | |
2269 | ffs->func = NULL; | |
2270 | } | |
2271 | ||
2272 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); | |
2273 | ||
2274 | ffs_func_free(func); | |
2275 | } | |
2276 | ||
2277 | ||
2278 | static int ffs_func_set_alt(struct usb_function *f, | |
2279 | unsigned interface, unsigned alt) | |
2280 | { | |
2281 | struct ffs_function *func = ffs_func_from_usb(f); | |
2282 | struct ffs_data *ffs = func->ffs; | |
2283 | int ret = 0, intf; | |
2284 | ||
2285 | if (alt != (unsigned)-1) { | |
2286 | intf = ffs_func_revmap_intf(func, interface); | |
2287 | if (unlikely(intf < 0)) | |
2288 | return intf; | |
2289 | } | |
2290 | ||
2291 | if (ffs->func) | |
2292 | ffs_func_eps_disable(ffs->func); | |
2293 | ||
2294 | if (ffs->state != FFS_ACTIVE) | |
2295 | return -ENODEV; | |
2296 | ||
2297 | if (alt == (unsigned)-1) { | |
2298 | ffs->func = NULL; | |
2299 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); | |
2300 | return 0; | |
2301 | } | |
2302 | ||
2303 | ffs->func = func; | |
2304 | ret = ffs_func_eps_enable(func); | |
2305 | if (likely(ret >= 0)) | |
2306 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); | |
2307 | return ret; | |
2308 | } | |
2309 | ||
2310 | static void ffs_func_disable(struct usb_function *f) | |
2311 | { | |
2312 | ffs_func_set_alt(f, 0, (unsigned)-1); | |
2313 | } | |
2314 | ||
2315 | static int ffs_func_setup(struct usb_function *f, | |
2316 | const struct usb_ctrlrequest *creq) | |
2317 | { | |
2318 | struct ffs_function *func = ffs_func_from_usb(f); | |
2319 | struct ffs_data *ffs = func->ffs; | |
2320 | unsigned long flags; | |
2321 | int ret; | |
2322 | ||
2323 | ENTER(); | |
2324 | ||
2325 | FVDBG("creq->bRequestType = %02x", creq->bRequestType); | |
2326 | FVDBG("creq->bRequest = %02x", creq->bRequest); | |
2327 | FVDBG("creq->wValue = %04x", le16_to_cpu(creq->wValue)); | |
2328 | FVDBG("creq->wIndex = %04x", le16_to_cpu(creq->wIndex)); | |
2329 | FVDBG("creq->wLength = %04x", le16_to_cpu(creq->wLength)); | |
2330 | ||
2331 | /* Most requests directed to interface go throught here | |
2332 | * (notable exceptions are set/get interface) so we need to | |
2333 | * handle them. All other either handled by composite or | |
2334 | * passed to usb_configuration->setup() (if one is set). No | |
2335 | * matter, we will handle requests directed to endpoint here | |
2336 | * as well (as it's straightforward) but what to do with any | |
2337 | * other request? */ | |
2338 | ||
2339 | if (ffs->state != FFS_ACTIVE) | |
2340 | return -ENODEV; | |
2341 | ||
2342 | switch (creq->bRequestType & USB_RECIP_MASK) { | |
2343 | case USB_RECIP_INTERFACE: | |
2344 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); | |
2345 | if (unlikely(ret < 0)) | |
2346 | return ret; | |
2347 | break; | |
2348 | ||
2349 | case USB_RECIP_ENDPOINT: | |
2350 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); | |
2351 | if (unlikely(ret < 0)) | |
2352 | return ret; | |
2353 | break; | |
2354 | ||
2355 | default: | |
2356 | return -EOPNOTSUPP; | |
2357 | } | |
2358 | ||
2359 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2360 | ffs->ev.setup = *creq; | |
2361 | ffs->ev.setup.wIndex = cpu_to_le16(ret); | |
2362 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); | |
2363 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2364 | ||
2365 | return 0; | |
2366 | } | |
2367 | ||
2368 | static void ffs_func_suspend(struct usb_function *f) | |
2369 | { | |
2370 | ENTER(); | |
2371 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); | |
2372 | } | |
2373 | ||
2374 | static void ffs_func_resume(struct usb_function *f) | |
2375 | { | |
2376 | ENTER(); | |
2377 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); | |
2378 | } | |
2379 | ||
2380 | ||
2381 | ||
2382 | /* Enpoint and interface numbers reverse mapping ****************************/ | |
2383 | ||
2384 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) | |
2385 | { | |
2386 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; | |
2387 | return num ? num : -EDOM; | |
2388 | } | |
2389 | ||
2390 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) | |
2391 | { | |
2392 | short *nums = func->interfaces_nums; | |
2393 | unsigned count = func->ffs->interfaces_count; | |
2394 | ||
2395 | for (; count; --count, ++nums) { | |
2396 | if (*nums >= 0 && *nums == intf) | |
2397 | return nums - func->interfaces_nums; | |
2398 | } | |
2399 | ||
2400 | return -EDOM; | |
2401 | } | |
2402 | ||
2403 | ||
2404 | /* Misc helper functions ****************************************************/ | |
2405 | ||
2406 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
2407 | { | |
2408 | return nonblock | |
2409 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN | |
2410 | : mutex_lock_interruptible(mutex); | |
2411 | } | |
2412 | ||
2413 | ||
2414 | static char *ffs_prepare_buffer(const char * __user buf, size_t len) | |
2415 | { | |
2416 | char *data; | |
2417 | ||
2418 | if (unlikely(!len)) | |
2419 | return NULL; | |
2420 | ||
2421 | data = kmalloc(len, GFP_KERNEL); | |
2422 | if (unlikely(!data)) | |
2423 | return ERR_PTR(-ENOMEM); | |
2424 | ||
2425 | if (unlikely(__copy_from_user(data, buf, len))) { | |
2426 | kfree(data); | |
2427 | return ERR_PTR(-EFAULT); | |
2428 | } | |
2429 | ||
2430 | FVDBG("Buffer from user space:"); | |
2431 | ffs_dump_mem("", data, len); | |
2432 | ||
2433 | return data; | |
2434 | } |