]>
Commit | Line | Data |
---|---|---|
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 | |
54b8360f | 5 | * Author: Michal Nazarewicz <mina86@mina86.com> |
ddf8abd2 | 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> |
560f1187 | 24 | #include <linux/hid.h> |
5920cda6 | 25 | #include <linux/module.h> |
ddf8abd2 | 26 | #include <asm/unaligned.h> |
ddf8abd2 MN |
27 | |
28 | #include <linux/usb/composite.h> | |
29 | #include <linux/usb/functionfs.h> | |
30 | ||
2e4c7553 RB |
31 | #include <linux/aio.h> |
32 | #include <linux/mmu_context.h> | |
23de91e9 RB |
33 | #include <linux/poll.h> |
34 | ||
e72c39c0 | 35 | #include "u_fs.h" |
74d48466 | 36 | #include "u_f.h" |
b658499f | 37 | #include "configfs.h" |
ddf8abd2 MN |
38 | |
39 | #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ | |
40 | ||
ddf8abd2 MN |
41 | /* Reference counter handling */ |
42 | static void ffs_data_get(struct ffs_data *ffs); | |
43 | static void ffs_data_put(struct ffs_data *ffs); | |
44 | /* Creates new ffs_data object. */ | |
45 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); | |
46 | ||
47 | /* Opened counter handling. */ | |
48 | static void ffs_data_opened(struct ffs_data *ffs); | |
49 | static void ffs_data_closed(struct ffs_data *ffs); | |
50 | ||
5ab54cf7 | 51 | /* Called with ffs->mutex held; take over ownership of data. */ |
ddf8abd2 MN |
52 | static int __must_check |
53 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); | |
54 | static int __must_check | |
55 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); | |
56 | ||
57 | ||
58 | /* The function structure ***************************************************/ | |
59 | ||
60 | struct ffs_ep; | |
61 | ||
62 | struct ffs_function { | |
63 | struct usb_configuration *conf; | |
64 | struct usb_gadget *gadget; | |
65 | struct ffs_data *ffs; | |
66 | ||
67 | struct ffs_ep *eps; | |
68 | u8 eps_revmap[16]; | |
69 | short *interfaces_nums; | |
70 | ||
71 | struct usb_function function; | |
72 | }; | |
73 | ||
74 | ||
75 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) | |
76 | { | |
77 | return container_of(f, struct ffs_function, function); | |
78 | } | |
79 | ||
ddf8abd2 | 80 | |
a7ecf054 MN |
81 | static inline enum ffs_setup_state |
82 | ffs_setup_state_clear_cancelled(struct ffs_data *ffs) | |
83 | { | |
84 | return (enum ffs_setup_state) | |
85 | cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); | |
86 | } | |
87 | ||
88 | ||
ddf8abd2 MN |
89 | static void ffs_func_eps_disable(struct ffs_function *func); |
90 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); | |
91 | ||
ddf8abd2 MN |
92 | static int ffs_func_bind(struct usb_configuration *, |
93 | struct usb_function *); | |
ddf8abd2 MN |
94 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); |
95 | static void ffs_func_disable(struct usb_function *); | |
96 | static int ffs_func_setup(struct usb_function *, | |
97 | const struct usb_ctrlrequest *); | |
98 | static void ffs_func_suspend(struct usb_function *); | |
99 | static void ffs_func_resume(struct usb_function *); | |
100 | ||
101 | ||
102 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); | |
103 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); | |
104 | ||
105 | ||
ddf8abd2 MN |
106 | /* The endpoints structures *************************************************/ |
107 | ||
108 | struct ffs_ep { | |
109 | struct usb_ep *ep; /* P: ffs->eps_lock */ | |
110 | struct usb_request *req; /* P: epfile->mutex */ | |
111 | ||
8d4e897b MG |
112 | /* [0]: full speed, [1]: high speed, [2]: super speed */ |
113 | struct usb_endpoint_descriptor *descs[3]; | |
ddf8abd2 MN |
114 | |
115 | u8 num; | |
116 | ||
117 | int status; /* P: epfile->mutex */ | |
118 | }; | |
119 | ||
120 | struct ffs_epfile { | |
121 | /* Protects ep->ep and ep->req. */ | |
122 | struct mutex mutex; | |
123 | wait_queue_head_t wait; | |
124 | ||
125 | struct ffs_data *ffs; | |
126 | struct ffs_ep *ep; /* P: ffs->eps_lock */ | |
127 | ||
128 | struct dentry *dentry; | |
129 | ||
130 | char name[5]; | |
131 | ||
132 | unsigned char in; /* P: ffs->eps_lock */ | |
133 | unsigned char isoc; /* P: ffs->eps_lock */ | |
134 | ||
135 | unsigned char _pad; | |
136 | }; | |
137 | ||
2e4c7553 RB |
138 | /* ffs_io_data structure ***************************************************/ |
139 | ||
140 | struct ffs_io_data { | |
141 | bool aio; | |
142 | bool read; | |
143 | ||
144 | struct kiocb *kiocb; | |
145 | const struct iovec *iovec; | |
146 | unsigned long nr_segs; | |
147 | char __user *buf; | |
148 | size_t len; | |
149 | ||
150 | struct mm_struct *mm; | |
151 | struct work_struct work; | |
152 | ||
153 | struct usb_ep *ep; | |
154 | struct usb_request *req; | |
155 | }; | |
156 | ||
ddf8abd2 MN |
157 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
158 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); | |
159 | ||
160 | static struct inode *__must_check | |
161 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, | |
162 | const struct file_operations *fops, | |
163 | struct dentry **dentry_p); | |
164 | ||
4b187fce AP |
165 | /* Devices management *******************************************************/ |
166 | ||
167 | DEFINE_MUTEX(ffs_lock); | |
0700faaf | 168 | EXPORT_SYMBOL_GPL(ffs_lock); |
4b187fce | 169 | |
da13a773 AP |
170 | static struct ffs_dev *_ffs_find_dev(const char *name); |
171 | static struct ffs_dev *_ffs_alloc_dev(void); | |
b658499f | 172 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name); |
da13a773 | 173 | static void _ffs_free_dev(struct ffs_dev *dev); |
4b187fce AP |
174 | static void *ffs_acquire_dev(const char *dev_name); |
175 | static void ffs_release_dev(struct ffs_data *ffs_data); | |
176 | static int ffs_ready(struct ffs_data *ffs); | |
177 | static void ffs_closed(struct ffs_data *ffs); | |
ddf8abd2 MN |
178 | |
179 | /* Misc helper functions ****************************************************/ | |
180 | ||
181 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
182 | __attribute__((warn_unused_result, nonnull)); | |
260ef311 | 183 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
184 | __attribute__((warn_unused_result, nonnull)); |
185 | ||
186 | ||
187 | /* Control file aka ep0 *****************************************************/ | |
188 | ||
189 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
190 | { | |
191 | struct ffs_data *ffs = req->context; | |
192 | ||
193 | complete_all(&ffs->ep0req_completion); | |
194 | } | |
195 | ||
ddf8abd2 MN |
196 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
197 | { | |
198 | struct usb_request *req = ffs->ep0req; | |
199 | int ret; | |
200 | ||
201 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); | |
202 | ||
203 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
204 | ||
205 | req->buf = data; | |
206 | req->length = len; | |
207 | ||
ce1fd358 MS |
208 | /* |
209 | * UDC layer requires to provide a buffer even for ZLP, but should | |
210 | * not use it at all. Let's provide some poisoned pointer to catch | |
211 | * possible bug in the driver. | |
212 | */ | |
213 | if (req->buf == NULL) | |
214 | req->buf = (void *)0xDEADBABE; | |
215 | ||
16735d02 | 216 | reinit_completion(&ffs->ep0req_completion); |
ddf8abd2 MN |
217 | |
218 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); | |
219 | if (unlikely(ret < 0)) | |
220 | return ret; | |
221 | ||
222 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); | |
223 | if (unlikely(ret)) { | |
224 | usb_ep_dequeue(ffs->gadget->ep0, req); | |
225 | return -EINTR; | |
226 | } | |
227 | ||
228 | ffs->setup_state = FFS_NO_SETUP; | |
0a7b1f8a | 229 | return req->status ? req->status : req->actual; |
ddf8abd2 MN |
230 | } |
231 | ||
232 | static int __ffs_ep0_stall(struct ffs_data *ffs) | |
233 | { | |
234 | if (ffs->ev.can_stall) { | |
aa02f172 | 235 | pr_vdebug("ep0 stall\n"); |
ddf8abd2 MN |
236 | usb_ep_set_halt(ffs->gadget->ep0); |
237 | ffs->setup_state = FFS_NO_SETUP; | |
238 | return -EL2HLT; | |
239 | } else { | |
aa02f172 | 240 | pr_debug("bogus ep0 stall!\n"); |
ddf8abd2 MN |
241 | return -ESRCH; |
242 | } | |
243 | } | |
244 | ||
ddf8abd2 MN |
245 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
246 | size_t len, loff_t *ptr) | |
247 | { | |
248 | struct ffs_data *ffs = file->private_data; | |
249 | ssize_t ret; | |
250 | char *data; | |
251 | ||
252 | ENTER(); | |
253 | ||
254 | /* Fast check if setup was canceled */ | |
a7ecf054 | 255 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
256 | return -EIDRM; |
257 | ||
258 | /* Acquire mutex */ | |
259 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
260 | if (unlikely(ret < 0)) | |
261 | return ret; | |
262 | ||
ddf8abd2 MN |
263 | /* Check state */ |
264 | switch (ffs->state) { | |
265 | case FFS_READ_DESCRIPTORS: | |
266 | case FFS_READ_STRINGS: | |
267 | /* Copy data */ | |
268 | if (unlikely(len < 16)) { | |
269 | ret = -EINVAL; | |
270 | break; | |
271 | } | |
272 | ||
273 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 274 | if (IS_ERR(data)) { |
ddf8abd2 MN |
275 | ret = PTR_ERR(data); |
276 | break; | |
277 | } | |
278 | ||
279 | /* Handle data */ | |
280 | if (ffs->state == FFS_READ_DESCRIPTORS) { | |
aa02f172 | 281 | pr_info("read descriptors\n"); |
ddf8abd2 MN |
282 | ret = __ffs_data_got_descs(ffs, data, len); |
283 | if (unlikely(ret < 0)) | |
284 | break; | |
285 | ||
286 | ffs->state = FFS_READ_STRINGS; | |
287 | ret = len; | |
288 | } else { | |
aa02f172 | 289 | pr_info("read strings\n"); |
ddf8abd2 MN |
290 | ret = __ffs_data_got_strings(ffs, data, len); |
291 | if (unlikely(ret < 0)) | |
292 | break; | |
293 | ||
294 | ret = ffs_epfiles_create(ffs); | |
295 | if (unlikely(ret)) { | |
296 | ffs->state = FFS_CLOSING; | |
297 | break; | |
298 | } | |
299 | ||
300 | ffs->state = FFS_ACTIVE; | |
301 | mutex_unlock(&ffs->mutex); | |
302 | ||
4b187fce | 303 | ret = ffs_ready(ffs); |
ddf8abd2 MN |
304 | if (unlikely(ret < 0)) { |
305 | ffs->state = FFS_CLOSING; | |
306 | return ret; | |
307 | } | |
308 | ||
309 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); | |
310 | return len; | |
311 | } | |
312 | break; | |
313 | ||
ddf8abd2 MN |
314 | case FFS_ACTIVE: |
315 | data = NULL; | |
5ab54cf7 MN |
316 | /* |
317 | * We're called from user space, we can use _irq | |
318 | * rather then _irqsave | |
319 | */ | |
ddf8abd2 | 320 | spin_lock_irq(&ffs->ev.waitq.lock); |
a7ecf054 | 321 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 322 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
323 | ret = -EIDRM; |
324 | goto done_spin; | |
325 | ||
326 | case FFS_NO_SETUP: | |
327 | ret = -ESRCH; | |
328 | goto done_spin; | |
329 | ||
330 | case FFS_SETUP_PENDING: | |
331 | break; | |
332 | } | |
333 | ||
334 | /* FFS_SETUP_PENDING */ | |
335 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { | |
336 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
337 | ret = __ffs_ep0_stall(ffs); | |
338 | break; | |
339 | } | |
340 | ||
341 | /* FFS_SETUP_PENDING and not stall */ | |
342 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
343 | ||
344 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
345 | ||
346 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 347 | if (IS_ERR(data)) { |
ddf8abd2 MN |
348 | ret = PTR_ERR(data); |
349 | break; | |
350 | } | |
351 | ||
352 | spin_lock_irq(&ffs->ev.waitq.lock); | |
353 | ||
5ab54cf7 MN |
354 | /* |
355 | * We are guaranteed to be still in FFS_ACTIVE state | |
ddf8abd2 | 356 | * but the state of setup could have changed from |
e46318a0 | 357 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELLED so we need |
ddf8abd2 | 358 | * to check for that. If that happened we copied data |
5ab54cf7 MN |
359 | * from user space in vain but it's unlikely. |
360 | * | |
361 | * For sure we are not in FFS_NO_SETUP since this is | |
ddf8abd2 MN |
362 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
363 | * transition can be performed and it's protected by | |
5ab54cf7 MN |
364 | * mutex. |
365 | */ | |
a7ecf054 MN |
366 | if (ffs_setup_state_clear_cancelled(ffs) == |
367 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
368 | ret = -EIDRM; |
369 | done_spin: | |
370 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
371 | } else { | |
372 | /* unlocks spinlock */ | |
373 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
374 | } | |
375 | kfree(data); | |
376 | break; | |
377 | ||
ddf8abd2 MN |
378 | default: |
379 | ret = -EBADFD; | |
380 | break; | |
381 | } | |
382 | ||
ddf8abd2 MN |
383 | mutex_unlock(&ffs->mutex); |
384 | return ret; | |
385 | } | |
386 | ||
ddf8abd2 MN |
387 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, |
388 | size_t n) | |
389 | { | |
5ab54cf7 MN |
390 | /* |
391 | * We are holding ffs->ev.waitq.lock and ffs->mutex and we need | |
392 | * to release them. | |
393 | */ | |
ddf8abd2 MN |
394 | struct usb_functionfs_event events[n]; |
395 | unsigned i = 0; | |
396 | ||
397 | memset(events, 0, sizeof events); | |
398 | ||
399 | do { | |
400 | events[i].type = ffs->ev.types[i]; | |
401 | if (events[i].type == FUNCTIONFS_SETUP) { | |
402 | events[i].u.setup = ffs->ev.setup; | |
403 | ffs->setup_state = FFS_SETUP_PENDING; | |
404 | } | |
405 | } while (++i < n); | |
406 | ||
407 | if (n < ffs->ev.count) { | |
408 | ffs->ev.count -= n; | |
409 | memmove(ffs->ev.types, ffs->ev.types + n, | |
410 | ffs->ev.count * sizeof *ffs->ev.types); | |
411 | } else { | |
412 | ffs->ev.count = 0; | |
413 | } | |
414 | ||
415 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
416 | mutex_unlock(&ffs->mutex); | |
417 | ||
418 | return unlikely(__copy_to_user(buf, events, sizeof events)) | |
419 | ? -EFAULT : sizeof events; | |
420 | } | |
421 | ||
ddf8abd2 MN |
422 | static ssize_t ffs_ep0_read(struct file *file, char __user *buf, |
423 | size_t len, loff_t *ptr) | |
424 | { | |
425 | struct ffs_data *ffs = file->private_data; | |
426 | char *data = NULL; | |
427 | size_t n; | |
428 | int ret; | |
429 | ||
430 | ENTER(); | |
431 | ||
432 | /* Fast check if setup was canceled */ | |
a7ecf054 | 433 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
434 | return -EIDRM; |
435 | ||
436 | /* Acquire mutex */ | |
437 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
438 | if (unlikely(ret < 0)) | |
439 | return ret; | |
440 | ||
ddf8abd2 MN |
441 | /* Check state */ |
442 | if (ffs->state != FFS_ACTIVE) { | |
443 | ret = -EBADFD; | |
444 | goto done_mutex; | |
445 | } | |
446 | ||
5ab54cf7 MN |
447 | /* |
448 | * We're called from user space, we can use _irq rather then | |
449 | * _irqsave | |
450 | */ | |
ddf8abd2 MN |
451 | spin_lock_irq(&ffs->ev.waitq.lock); |
452 | ||
a7ecf054 | 453 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 454 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
455 | ret = -EIDRM; |
456 | break; | |
457 | ||
458 | case FFS_NO_SETUP: | |
459 | n = len / sizeof(struct usb_functionfs_event); | |
460 | if (unlikely(!n)) { | |
461 | ret = -EINVAL; | |
462 | break; | |
463 | } | |
464 | ||
465 | if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { | |
466 | ret = -EAGAIN; | |
467 | break; | |
468 | } | |
469 | ||
5ab54cf7 MN |
470 | if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, |
471 | ffs->ev.count)) { | |
ddf8abd2 MN |
472 | ret = -EINTR; |
473 | break; | |
474 | } | |
475 | ||
476 | return __ffs_ep0_read_events(ffs, buf, | |
477 | min(n, (size_t)ffs->ev.count)); | |
478 | ||
ddf8abd2 MN |
479 | case FFS_SETUP_PENDING: |
480 | if (ffs->ev.setup.bRequestType & USB_DIR_IN) { | |
481 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
482 | ret = __ffs_ep0_stall(ffs); | |
483 | goto done_mutex; | |
484 | } | |
485 | ||
486 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
487 | ||
488 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
489 | ||
490 | if (likely(len)) { | |
491 | data = kmalloc(len, GFP_KERNEL); | |
492 | if (unlikely(!data)) { | |
493 | ret = -ENOMEM; | |
494 | goto done_mutex; | |
495 | } | |
496 | } | |
497 | ||
498 | spin_lock_irq(&ffs->ev.waitq.lock); | |
499 | ||
500 | /* See ffs_ep0_write() */ | |
a7ecf054 MN |
501 | if (ffs_setup_state_clear_cancelled(ffs) == |
502 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
503 | ret = -EIDRM; |
504 | break; | |
505 | } | |
506 | ||
507 | /* unlocks spinlock */ | |
508 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
509 | if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len))) | |
510 | ret = -EFAULT; | |
511 | goto done_mutex; | |
512 | ||
513 | default: | |
514 | ret = -EBADFD; | |
515 | break; | |
516 | } | |
517 | ||
518 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
519 | done_mutex: | |
520 | mutex_unlock(&ffs->mutex); | |
521 | kfree(data); | |
522 | return ret; | |
523 | } | |
524 | ||
ddf8abd2 MN |
525 | static int ffs_ep0_open(struct inode *inode, struct file *file) |
526 | { | |
527 | struct ffs_data *ffs = inode->i_private; | |
528 | ||
529 | ENTER(); | |
530 | ||
531 | if (unlikely(ffs->state == FFS_CLOSING)) | |
532 | return -EBUSY; | |
533 | ||
534 | file->private_data = ffs; | |
535 | ffs_data_opened(ffs); | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
ddf8abd2 MN |
540 | static int ffs_ep0_release(struct inode *inode, struct file *file) |
541 | { | |
542 | struct ffs_data *ffs = file->private_data; | |
543 | ||
544 | ENTER(); | |
545 | ||
546 | ffs_data_closed(ffs); | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
ddf8abd2 MN |
551 | static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) |
552 | { | |
553 | struct ffs_data *ffs = file->private_data; | |
554 | struct usb_gadget *gadget = ffs->gadget; | |
555 | long ret; | |
556 | ||
557 | ENTER(); | |
558 | ||
559 | if (code == FUNCTIONFS_INTERFACE_REVMAP) { | |
560 | struct ffs_function *func = ffs->func; | |
561 | ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; | |
92b0abf8 | 562 | } else if (gadget && gadget->ops->ioctl) { |
ddf8abd2 | 563 | ret = gadget->ops->ioctl(gadget, code, value); |
ddf8abd2 MN |
564 | } else { |
565 | ret = -ENOTTY; | |
566 | } | |
567 | ||
568 | return ret; | |
569 | } | |
570 | ||
23de91e9 RB |
571 | static unsigned int ffs_ep0_poll(struct file *file, poll_table *wait) |
572 | { | |
573 | struct ffs_data *ffs = file->private_data; | |
574 | unsigned int mask = POLLWRNORM; | |
575 | int ret; | |
576 | ||
577 | poll_wait(file, &ffs->ev.waitq, wait); | |
578 | ||
579 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
580 | if (unlikely(ret < 0)) | |
581 | return mask; | |
582 | ||
583 | switch (ffs->state) { | |
584 | case FFS_READ_DESCRIPTORS: | |
585 | case FFS_READ_STRINGS: | |
586 | mask |= POLLOUT; | |
587 | break; | |
588 | ||
589 | case FFS_ACTIVE: | |
590 | switch (ffs->setup_state) { | |
591 | case FFS_NO_SETUP: | |
592 | if (ffs->ev.count) | |
593 | mask |= POLLIN; | |
594 | break; | |
595 | ||
596 | case FFS_SETUP_PENDING: | |
597 | case FFS_SETUP_CANCELLED: | |
598 | mask |= (POLLIN | POLLOUT); | |
599 | break; | |
600 | } | |
601 | case FFS_CLOSING: | |
602 | break; | |
603 | } | |
604 | ||
605 | mutex_unlock(&ffs->mutex); | |
606 | ||
607 | return mask; | |
608 | } | |
609 | ||
ddf8abd2 | 610 | static const struct file_operations ffs_ep0_operations = { |
ddf8abd2 MN |
611 | .llseek = no_llseek, |
612 | ||
613 | .open = ffs_ep0_open, | |
614 | .write = ffs_ep0_write, | |
615 | .read = ffs_ep0_read, | |
616 | .release = ffs_ep0_release, | |
617 | .unlocked_ioctl = ffs_ep0_ioctl, | |
23de91e9 | 618 | .poll = ffs_ep0_poll, |
ddf8abd2 MN |
619 | }; |
620 | ||
621 | ||
622 | /* "Normal" endpoints operations ********************************************/ | |
623 | ||
ddf8abd2 MN |
624 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) |
625 | { | |
626 | ENTER(); | |
627 | if (likely(req->context)) { | |
628 | struct ffs_ep *ep = _ep->driver_data; | |
629 | ep->status = req->status ? req->status : req->actual; | |
630 | complete(req->context); | |
631 | } | |
632 | } | |
633 | ||
2e4c7553 RB |
634 | static void ffs_user_copy_worker(struct work_struct *work) |
635 | { | |
636 | struct ffs_io_data *io_data = container_of(work, struct ffs_io_data, | |
637 | work); | |
638 | int ret = io_data->req->status ? io_data->req->status : | |
639 | io_data->req->actual; | |
640 | ||
641 | if (io_data->read && ret > 0) { | |
642 | int i; | |
643 | size_t pos = 0; | |
644 | use_mm(io_data->mm); | |
645 | for (i = 0; i < io_data->nr_segs; i++) { | |
646 | if (unlikely(copy_to_user(io_data->iovec[i].iov_base, | |
647 | &io_data->buf[pos], | |
648 | io_data->iovec[i].iov_len))) { | |
649 | ret = -EFAULT; | |
650 | break; | |
651 | } | |
652 | pos += io_data->iovec[i].iov_len; | |
653 | } | |
654 | unuse_mm(io_data->mm); | |
655 | } | |
656 | ||
657 | aio_complete(io_data->kiocb, ret, ret); | |
658 | ||
659 | usb_ep_free_request(io_data->ep, io_data->req); | |
660 | ||
661 | io_data->kiocb->private = NULL; | |
662 | if (io_data->read) | |
663 | kfree(io_data->iovec); | |
664 | kfree(io_data->buf); | |
665 | kfree(io_data); | |
666 | } | |
667 | ||
668 | static void ffs_epfile_async_io_complete(struct usb_ep *_ep, | |
669 | struct usb_request *req) | |
670 | { | |
671 | struct ffs_io_data *io_data = req->context; | |
672 | ||
673 | ENTER(); | |
674 | ||
675 | INIT_WORK(&io_data->work, ffs_user_copy_worker); | |
676 | schedule_work(&io_data->work); | |
677 | } | |
678 | ||
679 | static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data) | |
ddf8abd2 MN |
680 | { |
681 | struct ffs_epfile *epfile = file->private_data; | |
682 | struct ffs_ep *ep; | |
683 | char *data = NULL; | |
219580e6 | 684 | ssize_t ret, data_len; |
ddf8abd2 MN |
685 | int halt; |
686 | ||
7fa68034 MN |
687 | /* Are we still active? */ |
688 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) { | |
689 | ret = -ENODEV; | |
690 | goto error; | |
691 | } | |
ddf8abd2 | 692 | |
7fa68034 MN |
693 | /* Wait for endpoint to be enabled */ |
694 | ep = epfile->ep; | |
695 | if (!ep) { | |
696 | if (file->f_flags & O_NONBLOCK) { | |
697 | ret = -EAGAIN; | |
ddf8abd2 MN |
698 | goto error; |
699 | } | |
700 | ||
7fa68034 MN |
701 | ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep)); |
702 | if (ret) { | |
703 | ret = -EINTR; | |
ddf8abd2 MN |
704 | goto error; |
705 | } | |
7fa68034 | 706 | } |
ddf8abd2 | 707 | |
7fa68034 | 708 | /* Do we halt? */ |
2e4c7553 | 709 | halt = (!io_data->read == !epfile->in); |
7fa68034 MN |
710 | if (halt && epfile->isoc) { |
711 | ret = -EINVAL; | |
712 | goto error; | |
713 | } | |
ddf8abd2 | 714 | |
7fa68034 MN |
715 | /* Allocate & copy */ |
716 | if (!halt) { | |
f0f42204 AP |
717 | /* |
718 | * if we _do_ wait above, the epfile->ffs->gadget might be NULL | |
719 | * before the waiting completes, so do not assign to 'gadget' earlier | |
720 | */ | |
721 | struct usb_gadget *gadget = epfile->ffs->gadget; | |
722 | ||
219580e6 MN |
723 | /* |
724 | * Controller may require buffer size to be aligned to | |
725 | * maxpacketsize of an out endpoint. | |
726 | */ | |
2e4c7553 RB |
727 | data_len = io_data->read ? |
728 | usb_ep_align_maybe(gadget, ep->ep, io_data->len) : | |
729 | io_data->len; | |
219580e6 MN |
730 | |
731 | data = kmalloc(data_len, GFP_KERNEL); | |
7fa68034 MN |
732 | if (unlikely(!data)) |
733 | return -ENOMEM; | |
2e4c7553 RB |
734 | if (io_data->aio && !io_data->read) { |
735 | int i; | |
736 | size_t pos = 0; | |
737 | for (i = 0; i < io_data->nr_segs; i++) { | |
738 | if (unlikely(copy_from_user(&data[pos], | |
739 | io_data->iovec[i].iov_base, | |
740 | io_data->iovec[i].iov_len))) { | |
741 | ret = -EFAULT; | |
742 | goto error; | |
743 | } | |
744 | pos += io_data->iovec[i].iov_len; | |
745 | } | |
746 | } else { | |
747 | if (!io_data->read && | |
748 | unlikely(__copy_from_user(data, io_data->buf, | |
749 | io_data->len))) { | |
750 | ret = -EFAULT; | |
751 | goto error; | |
752 | } | |
7fa68034 MN |
753 | } |
754 | } | |
ddf8abd2 | 755 | |
7fa68034 MN |
756 | /* We will be using request */ |
757 | ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); | |
758 | if (unlikely(ret)) | |
759 | goto error; | |
ddf8abd2 | 760 | |
7fa68034 | 761 | spin_lock_irq(&epfile->ffs->eps_lock); |
ddf8abd2 | 762 | |
7fa68034 MN |
763 | if (epfile->ep != ep) { |
764 | /* In the meantime, endpoint got disabled or changed. */ | |
765 | ret = -ESHUTDOWN; | |
766 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
767 | } else if (halt) { | |
768 | /* Halt */ | |
ddf8abd2 MN |
769 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) |
770 | usb_ep_set_halt(ep->ep); | |
771 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
772 | ret = -EBADMSG; | |
773 | } else { | |
774 | /* Fire the request */ | |
2e4c7553 | 775 | struct usb_request *req; |
ddf8abd2 | 776 | |
2e4c7553 RB |
777 | if (io_data->aio) { |
778 | req = usb_ep_alloc_request(ep->ep, GFP_KERNEL); | |
779 | if (unlikely(!req)) | |
48968f8d | 780 | goto error_lock; |
ddf8abd2 | 781 | |
2e4c7553 RB |
782 | req->buf = data; |
783 | req->length = io_data->len; | |
ddf8abd2 | 784 | |
2e4c7553 RB |
785 | io_data->buf = data; |
786 | io_data->ep = ep->ep; | |
787 | io_data->req = req; | |
ddf8abd2 | 788 | |
2e4c7553 RB |
789 | req->context = io_data; |
790 | req->complete = ffs_epfile_async_io_complete; | |
791 | ||
792 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); | |
793 | if (unlikely(ret)) { | |
794 | usb_ep_free_request(ep->ep, req); | |
48968f8d | 795 | goto error_lock; |
2e4c7553 RB |
796 | } |
797 | ret = -EIOCBQUEUED; | |
798 | ||
799 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
ddf8abd2 | 800 | } else { |
2e4c7553 RB |
801 | DECLARE_COMPLETION_ONSTACK(done); |
802 | ||
803 | req = ep->req; | |
804 | req->buf = data; | |
805 | req->length = io_data->len; | |
806 | ||
807 | req->context = &done; | |
808 | req->complete = ffs_epfile_io_complete; | |
809 | ||
810 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); | |
811 | ||
812 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
813 | ||
814 | if (unlikely(ret < 0)) { | |
815 | /* nop */ | |
816 | } else if (unlikely( | |
817 | wait_for_completion_interruptible(&done))) { | |
818 | ret = -EINTR; | |
819 | usb_ep_dequeue(ep->ep, req); | |
820 | } else { | |
cfe919b5 CL |
821 | /* |
822 | * XXX We may end up silently droping data | |
823 | * here. Since data_len (i.e. req->length) may | |
824 | * be bigger than len (after being rounded up | |
825 | * to maxpacketsize), we may end up with more | |
826 | * data then user space has space for. | |
827 | */ | |
828 | ret = ep->status; | |
829 | if (io_data->read && ret > 0) { | |
830 | ret = min_t(size_t, ret, io_data->len); | |
831 | ||
832 | if (unlikely(copy_to_user(io_data->buf, | |
833 | data, ret))) | |
834 | ret = -EFAULT; | |
835 | } | |
2e4c7553 RB |
836 | } |
837 | kfree(data); | |
ddf8abd2 MN |
838 | } |
839 | } | |
840 | ||
841 | mutex_unlock(&epfile->mutex); | |
2e4c7553 | 842 | return ret; |
48968f8d RB |
843 | |
844 | error_lock: | |
845 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
846 | mutex_unlock(&epfile->mutex); | |
ddf8abd2 MN |
847 | error: |
848 | kfree(data); | |
849 | return ret; | |
850 | } | |
851 | ||
ddf8abd2 MN |
852 | static ssize_t |
853 | ffs_epfile_write(struct file *file, const char __user *buf, size_t len, | |
854 | loff_t *ptr) | |
855 | { | |
2e4c7553 RB |
856 | struct ffs_io_data io_data; |
857 | ||
ddf8abd2 MN |
858 | ENTER(); |
859 | ||
2e4c7553 RB |
860 | io_data.aio = false; |
861 | io_data.read = false; | |
862 | io_data.buf = (char * __user)buf; | |
863 | io_data.len = len; | |
864 | ||
865 | return ffs_epfile_io(file, &io_data); | |
ddf8abd2 MN |
866 | } |
867 | ||
868 | static ssize_t | |
869 | ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr) | |
870 | { | |
2e4c7553 RB |
871 | struct ffs_io_data io_data; |
872 | ||
ddf8abd2 MN |
873 | ENTER(); |
874 | ||
2e4c7553 RB |
875 | io_data.aio = false; |
876 | io_data.read = true; | |
877 | io_data.buf = buf; | |
878 | io_data.len = len; | |
879 | ||
880 | return ffs_epfile_io(file, &io_data); | |
ddf8abd2 MN |
881 | } |
882 | ||
883 | static int | |
884 | ffs_epfile_open(struct inode *inode, struct file *file) | |
885 | { | |
886 | struct ffs_epfile *epfile = inode->i_private; | |
887 | ||
888 | ENTER(); | |
889 | ||
890 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
891 | return -ENODEV; | |
892 | ||
893 | file->private_data = epfile; | |
894 | ffs_data_opened(epfile->ffs); | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
2e4c7553 RB |
899 | static int ffs_aio_cancel(struct kiocb *kiocb) |
900 | { | |
901 | struct ffs_io_data *io_data = kiocb->private; | |
902 | struct ffs_epfile *epfile = kiocb->ki_filp->private_data; | |
903 | int value; | |
904 | ||
905 | ENTER(); | |
906 | ||
907 | spin_lock_irq(&epfile->ffs->eps_lock); | |
908 | ||
909 | if (likely(io_data && io_data->ep && io_data->req)) | |
910 | value = usb_ep_dequeue(io_data->ep, io_data->req); | |
911 | else | |
912 | value = -EINVAL; | |
913 | ||
914 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
915 | ||
916 | return value; | |
917 | } | |
918 | ||
919 | static ssize_t ffs_epfile_aio_write(struct kiocb *kiocb, | |
920 | const struct iovec *iovec, | |
921 | unsigned long nr_segs, loff_t loff) | |
922 | { | |
923 | struct ffs_io_data *io_data; | |
924 | ||
925 | ENTER(); | |
926 | ||
927 | io_data = kmalloc(sizeof(*io_data), GFP_KERNEL); | |
928 | if (unlikely(!io_data)) | |
929 | return -ENOMEM; | |
930 | ||
931 | io_data->aio = true; | |
932 | io_data->read = false; | |
933 | io_data->kiocb = kiocb; | |
934 | io_data->iovec = iovec; | |
935 | io_data->nr_segs = nr_segs; | |
936 | io_data->len = kiocb->ki_nbytes; | |
937 | io_data->mm = current->mm; | |
938 | ||
939 | kiocb->private = io_data; | |
940 | ||
941 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
942 | ||
943 | return ffs_epfile_io(kiocb->ki_filp, io_data); | |
944 | } | |
945 | ||
946 | static ssize_t ffs_epfile_aio_read(struct kiocb *kiocb, | |
947 | const struct iovec *iovec, | |
948 | unsigned long nr_segs, loff_t loff) | |
949 | { | |
950 | struct ffs_io_data *io_data; | |
951 | struct iovec *iovec_copy; | |
952 | ||
953 | ENTER(); | |
954 | ||
955 | iovec_copy = kmalloc_array(nr_segs, sizeof(*iovec_copy), GFP_KERNEL); | |
956 | if (unlikely(!iovec_copy)) | |
957 | return -ENOMEM; | |
958 | ||
959 | memcpy(iovec_copy, iovec, sizeof(struct iovec)*nr_segs); | |
960 | ||
961 | io_data = kmalloc(sizeof(*io_data), GFP_KERNEL); | |
962 | if (unlikely(!io_data)) { | |
963 | kfree(iovec_copy); | |
964 | return -ENOMEM; | |
965 | } | |
966 | ||
967 | io_data->aio = true; | |
968 | io_data->read = true; | |
969 | io_data->kiocb = kiocb; | |
970 | io_data->iovec = iovec_copy; | |
971 | io_data->nr_segs = nr_segs; | |
972 | io_data->len = kiocb->ki_nbytes; | |
973 | io_data->mm = current->mm; | |
974 | ||
975 | kiocb->private = io_data; | |
976 | ||
977 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
978 | ||
979 | return ffs_epfile_io(kiocb->ki_filp, io_data); | |
980 | } | |
981 | ||
ddf8abd2 MN |
982 | static int |
983 | ffs_epfile_release(struct inode *inode, struct file *file) | |
984 | { | |
985 | struct ffs_epfile *epfile = inode->i_private; | |
986 | ||
987 | ENTER(); | |
988 | ||
989 | ffs_data_closed(epfile->ffs); | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
ddf8abd2 MN |
994 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
995 | unsigned long value) | |
996 | { | |
997 | struct ffs_epfile *epfile = file->private_data; | |
998 | int ret; | |
999 | ||
1000 | ENTER(); | |
1001 | ||
1002 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
1003 | return -ENODEV; | |
1004 | ||
1005 | spin_lock_irq(&epfile->ffs->eps_lock); | |
1006 | if (likely(epfile->ep)) { | |
1007 | switch (code) { | |
1008 | case FUNCTIONFS_FIFO_STATUS: | |
1009 | ret = usb_ep_fifo_status(epfile->ep->ep); | |
1010 | break; | |
1011 | case FUNCTIONFS_FIFO_FLUSH: | |
1012 | usb_ep_fifo_flush(epfile->ep->ep); | |
1013 | ret = 0; | |
1014 | break; | |
1015 | case FUNCTIONFS_CLEAR_HALT: | |
1016 | ret = usb_ep_clear_halt(epfile->ep->ep); | |
1017 | break; | |
1018 | case FUNCTIONFS_ENDPOINT_REVMAP: | |
1019 | ret = epfile->ep->num; | |
1020 | break; | |
1021 | default: | |
1022 | ret = -ENOTTY; | |
1023 | } | |
1024 | } else { | |
1025 | ret = -ENODEV; | |
1026 | } | |
1027 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1028 | ||
1029 | return ret; | |
1030 | } | |
1031 | ||
ddf8abd2 | 1032 | static const struct file_operations ffs_epfile_operations = { |
ddf8abd2 MN |
1033 | .llseek = no_llseek, |
1034 | ||
1035 | .open = ffs_epfile_open, | |
1036 | .write = ffs_epfile_write, | |
1037 | .read = ffs_epfile_read, | |
2e4c7553 RB |
1038 | .aio_write = ffs_epfile_aio_write, |
1039 | .aio_read = ffs_epfile_aio_read, | |
ddf8abd2 MN |
1040 | .release = ffs_epfile_release, |
1041 | .unlocked_ioctl = ffs_epfile_ioctl, | |
1042 | }; | |
1043 | ||
1044 | ||
ddf8abd2 MN |
1045 | /* File system and super block operations ***********************************/ |
1046 | ||
1047 | /* | |
5ab54cf7 | 1048 | * Mounting the file system creates a controller file, used first for |
ddf8abd2 MN |
1049 | * function configuration then later for event monitoring. |
1050 | */ | |
1051 | ||
ddf8abd2 MN |
1052 | static struct inode *__must_check |
1053 | ffs_sb_make_inode(struct super_block *sb, void *data, | |
1054 | const struct file_operations *fops, | |
1055 | const struct inode_operations *iops, | |
1056 | struct ffs_file_perms *perms) | |
1057 | { | |
1058 | struct inode *inode; | |
1059 | ||
1060 | ENTER(); | |
1061 | ||
1062 | inode = new_inode(sb); | |
1063 | ||
1064 | if (likely(inode)) { | |
1065 | struct timespec current_time = CURRENT_TIME; | |
1066 | ||
12ba8d1e | 1067 | inode->i_ino = get_next_ino(); |
ddf8abd2 MN |
1068 | inode->i_mode = perms->mode; |
1069 | inode->i_uid = perms->uid; | |
1070 | inode->i_gid = perms->gid; | |
1071 | inode->i_atime = current_time; | |
1072 | inode->i_mtime = current_time; | |
1073 | inode->i_ctime = current_time; | |
1074 | inode->i_private = data; | |
1075 | if (fops) | |
1076 | inode->i_fop = fops; | |
1077 | if (iops) | |
1078 | inode->i_op = iops; | |
1079 | } | |
1080 | ||
1081 | return inode; | |
1082 | } | |
1083 | ||
ddf8abd2 | 1084 | /* Create "regular" file */ |
ddf8abd2 MN |
1085 | static struct inode *ffs_sb_create_file(struct super_block *sb, |
1086 | const char *name, void *data, | |
1087 | const struct file_operations *fops, | |
1088 | struct dentry **dentry_p) | |
1089 | { | |
1090 | struct ffs_data *ffs = sb->s_fs_info; | |
1091 | struct dentry *dentry; | |
1092 | struct inode *inode; | |
1093 | ||
1094 | ENTER(); | |
1095 | ||
1096 | dentry = d_alloc_name(sb->s_root, name); | |
1097 | if (unlikely(!dentry)) | |
1098 | return NULL; | |
1099 | ||
1100 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); | |
1101 | if (unlikely(!inode)) { | |
1102 | dput(dentry); | |
1103 | return NULL; | |
1104 | } | |
1105 | ||
1106 | d_add(dentry, inode); | |
1107 | if (dentry_p) | |
1108 | *dentry_p = dentry; | |
1109 | ||
1110 | return inode; | |
1111 | } | |
1112 | ||
ddf8abd2 | 1113 | /* Super block */ |
ddf8abd2 MN |
1114 | static const struct super_operations ffs_sb_operations = { |
1115 | .statfs = simple_statfs, | |
1116 | .drop_inode = generic_delete_inode, | |
1117 | }; | |
1118 | ||
1119 | struct ffs_sb_fill_data { | |
1120 | struct ffs_file_perms perms; | |
1121 | umode_t root_mode; | |
1122 | const char *dev_name; | |
2606b28a | 1123 | struct ffs_data *ffs_data; |
ddf8abd2 MN |
1124 | }; |
1125 | ||
1126 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) | |
1127 | { | |
1128 | struct ffs_sb_fill_data *data = _data; | |
1129 | struct inode *inode; | |
2606b28a | 1130 | struct ffs_data *ffs = data->ffs_data; |
ddf8abd2 MN |
1131 | |
1132 | ENTER(); | |
1133 | ||
ddf8abd2 | 1134 | ffs->sb = sb; |
2606b28a | 1135 | data->ffs_data = NULL; |
ddf8abd2 MN |
1136 | sb->s_fs_info = ffs; |
1137 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1138 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1139 | sb->s_magic = FUNCTIONFS_MAGIC; | |
1140 | sb->s_op = &ffs_sb_operations; | |
1141 | sb->s_time_gran = 1; | |
1142 | ||
1143 | /* Root inode */ | |
1144 | data->perms.mode = data->root_mode; | |
1145 | inode = ffs_sb_make_inode(sb, NULL, | |
1146 | &simple_dir_operations, | |
1147 | &simple_dir_inode_operations, | |
1148 | &data->perms); | |
48fde701 AV |
1149 | sb->s_root = d_make_root(inode); |
1150 | if (unlikely(!sb->s_root)) | |
2606b28a | 1151 | return -ENOMEM; |
ddf8abd2 MN |
1152 | |
1153 | /* EP0 file */ | |
1154 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, | |
1155 | &ffs_ep0_operations, NULL))) | |
2606b28a | 1156 | return -ENOMEM; |
ddf8abd2 MN |
1157 | |
1158 | return 0; | |
ddf8abd2 MN |
1159 | } |
1160 | ||
ddf8abd2 MN |
1161 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
1162 | { | |
1163 | ENTER(); | |
1164 | ||
1165 | if (!opts || !*opts) | |
1166 | return 0; | |
1167 | ||
1168 | for (;;) { | |
ddf8abd2 | 1169 | unsigned long value; |
afd2e186 | 1170 | char *eq, *comma; |
ddf8abd2 MN |
1171 | |
1172 | /* Option limit */ | |
1173 | comma = strchr(opts, ','); | |
1174 | if (comma) | |
1175 | *comma = 0; | |
1176 | ||
1177 | /* Value limit */ | |
1178 | eq = strchr(opts, '='); | |
1179 | if (unlikely(!eq)) { | |
aa02f172 | 1180 | pr_err("'=' missing in %s\n", opts); |
ddf8abd2 MN |
1181 | return -EINVAL; |
1182 | } | |
1183 | *eq = 0; | |
1184 | ||
1185 | /* Parse value */ | |
afd2e186 | 1186 | if (kstrtoul(eq + 1, 0, &value)) { |
aa02f172 | 1187 | pr_err("%s: invalid value: %s\n", opts, eq + 1); |
ddf8abd2 MN |
1188 | return -EINVAL; |
1189 | } | |
1190 | ||
1191 | /* Interpret option */ | |
1192 | switch (eq - opts) { | |
1193 | case 5: | |
1194 | if (!memcmp(opts, "rmode", 5)) | |
1195 | data->root_mode = (value & 0555) | S_IFDIR; | |
1196 | else if (!memcmp(opts, "fmode", 5)) | |
1197 | data->perms.mode = (value & 0666) | S_IFREG; | |
1198 | else | |
1199 | goto invalid; | |
1200 | break; | |
1201 | ||
1202 | case 4: | |
1203 | if (!memcmp(opts, "mode", 4)) { | |
1204 | data->root_mode = (value & 0555) | S_IFDIR; | |
1205 | data->perms.mode = (value & 0666) | S_IFREG; | |
1206 | } else { | |
1207 | goto invalid; | |
1208 | } | |
1209 | break; | |
1210 | ||
1211 | case 3: | |
b9b73f7c EB |
1212 | if (!memcmp(opts, "uid", 3)) { |
1213 | data->perms.uid = make_kuid(current_user_ns(), value); | |
1214 | if (!uid_valid(data->perms.uid)) { | |
1215 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1216 | return -EINVAL; | |
1217 | } | |
b8100750 | 1218 | } else if (!memcmp(opts, "gid", 3)) { |
b9b73f7c EB |
1219 | data->perms.gid = make_kgid(current_user_ns(), value); |
1220 | if (!gid_valid(data->perms.gid)) { | |
1221 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1222 | return -EINVAL; | |
1223 | } | |
b8100750 | 1224 | } else { |
ddf8abd2 | 1225 | goto invalid; |
b8100750 | 1226 | } |
ddf8abd2 MN |
1227 | break; |
1228 | ||
1229 | default: | |
1230 | invalid: | |
aa02f172 | 1231 | pr_err("%s: invalid option\n", opts); |
ddf8abd2 MN |
1232 | return -EINVAL; |
1233 | } | |
1234 | ||
1235 | /* Next iteration */ | |
1236 | if (!comma) | |
1237 | break; | |
1238 | opts = comma + 1; | |
1239 | } | |
1240 | ||
1241 | return 0; | |
1242 | } | |
1243 | ||
ddf8abd2 MN |
1244 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
1245 | ||
fc14f2fe AV |
1246 | static struct dentry * |
1247 | ffs_fs_mount(struct file_system_type *t, int flags, | |
1248 | const char *dev_name, void *opts) | |
ddf8abd2 MN |
1249 | { |
1250 | struct ffs_sb_fill_data data = { | |
1251 | .perms = { | |
1252 | .mode = S_IFREG | 0600, | |
b9b73f7c EB |
1253 | .uid = GLOBAL_ROOT_UID, |
1254 | .gid = GLOBAL_ROOT_GID, | |
ddf8abd2 MN |
1255 | }, |
1256 | .root_mode = S_IFDIR | 0500, | |
1257 | }; | |
581791f5 | 1258 | struct dentry *rv; |
ddf8abd2 | 1259 | int ret; |
581791f5 | 1260 | void *ffs_dev; |
2606b28a | 1261 | struct ffs_data *ffs; |
ddf8abd2 MN |
1262 | |
1263 | ENTER(); | |
1264 | ||
ddf8abd2 MN |
1265 | ret = ffs_fs_parse_opts(&data, opts); |
1266 | if (unlikely(ret < 0)) | |
fc14f2fe | 1267 | return ERR_PTR(ret); |
ddf8abd2 | 1268 | |
2606b28a AV |
1269 | ffs = ffs_data_new(); |
1270 | if (unlikely(!ffs)) | |
1271 | return ERR_PTR(-ENOMEM); | |
1272 | ffs->file_perms = data.perms; | |
1273 | ||
1274 | ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); | |
1275 | if (unlikely(!ffs->dev_name)) { | |
1276 | ffs_data_put(ffs); | |
1277 | return ERR_PTR(-ENOMEM); | |
1278 | } | |
1279 | ||
4b187fce | 1280 | ffs_dev = ffs_acquire_dev(dev_name); |
2606b28a AV |
1281 | if (IS_ERR(ffs_dev)) { |
1282 | ffs_data_put(ffs); | |
1283 | return ERR_CAST(ffs_dev); | |
1284 | } | |
1285 | ffs->private_data = ffs_dev; | |
1286 | data.ffs_data = ffs; | |
581791f5 | 1287 | |
581791f5 | 1288 | rv = mount_nodev(t, flags, &data, ffs_sb_fill); |
2606b28a | 1289 | if (IS_ERR(rv) && data.ffs_data) { |
4b187fce | 1290 | ffs_release_dev(data.ffs_data); |
2606b28a AV |
1291 | ffs_data_put(data.ffs_data); |
1292 | } | |
581791f5 | 1293 | return rv; |
ddf8abd2 MN |
1294 | } |
1295 | ||
1296 | static void | |
1297 | ffs_fs_kill_sb(struct super_block *sb) | |
1298 | { | |
ddf8abd2 MN |
1299 | ENTER(); |
1300 | ||
1301 | kill_litter_super(sb); | |
581791f5 | 1302 | if (sb->s_fs_info) { |
4b187fce | 1303 | ffs_release_dev(sb->s_fs_info); |
5b5f9560 | 1304 | ffs_data_put(sb->s_fs_info); |
581791f5 | 1305 | } |
ddf8abd2 MN |
1306 | } |
1307 | ||
1308 | static struct file_system_type ffs_fs_type = { | |
1309 | .owner = THIS_MODULE, | |
1310 | .name = "functionfs", | |
fc14f2fe | 1311 | .mount = ffs_fs_mount, |
ddf8abd2 MN |
1312 | .kill_sb = ffs_fs_kill_sb, |
1313 | }; | |
7f78e035 | 1314 | MODULE_ALIAS_FS("functionfs"); |
ddf8abd2 MN |
1315 | |
1316 | ||
ddf8abd2 MN |
1317 | /* Driver's main init/cleanup functions *************************************/ |
1318 | ||
ddf8abd2 MN |
1319 | static int functionfs_init(void) |
1320 | { | |
1321 | int ret; | |
1322 | ||
1323 | ENTER(); | |
1324 | ||
1325 | ret = register_filesystem(&ffs_fs_type); | |
1326 | if (likely(!ret)) | |
aa02f172 | 1327 | pr_info("file system registered\n"); |
ddf8abd2 | 1328 | else |
aa02f172 | 1329 | pr_err("failed registering file system (%d)\n", ret); |
ddf8abd2 MN |
1330 | |
1331 | return ret; | |
1332 | } | |
1333 | ||
1334 | static void functionfs_cleanup(void) | |
1335 | { | |
1336 | ENTER(); | |
1337 | ||
aa02f172 | 1338 | pr_info("unloading\n"); |
ddf8abd2 MN |
1339 | unregister_filesystem(&ffs_fs_type); |
1340 | } | |
1341 | ||
1342 | ||
ddf8abd2 MN |
1343 | /* ffs_data and ffs_function construction and destruction code **************/ |
1344 | ||
1345 | static void ffs_data_clear(struct ffs_data *ffs); | |
1346 | static void ffs_data_reset(struct ffs_data *ffs); | |
1347 | ||
ddf8abd2 MN |
1348 | static void ffs_data_get(struct ffs_data *ffs) |
1349 | { | |
1350 | ENTER(); | |
1351 | ||
1352 | atomic_inc(&ffs->ref); | |
1353 | } | |
1354 | ||
1355 | static void ffs_data_opened(struct ffs_data *ffs) | |
1356 | { | |
1357 | ENTER(); | |
1358 | ||
1359 | atomic_inc(&ffs->ref); | |
1360 | atomic_inc(&ffs->opened); | |
1361 | } | |
1362 | ||
1363 | static void ffs_data_put(struct ffs_data *ffs) | |
1364 | { | |
1365 | ENTER(); | |
1366 | ||
1367 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { | |
aa02f172 | 1368 | pr_info("%s(): freeing\n", __func__); |
ddf8abd2 | 1369 | ffs_data_clear(ffs); |
647d5580 | 1370 | BUG_ON(waitqueue_active(&ffs->ev.waitq) || |
ddf8abd2 | 1371 | waitqueue_active(&ffs->ep0req_completion.wait)); |
581791f5 | 1372 | kfree(ffs->dev_name); |
ddf8abd2 MN |
1373 | kfree(ffs); |
1374 | } | |
1375 | } | |
1376 | ||
ddf8abd2 MN |
1377 | static void ffs_data_closed(struct ffs_data *ffs) |
1378 | { | |
1379 | ENTER(); | |
1380 | ||
1381 | if (atomic_dec_and_test(&ffs->opened)) { | |
1382 | ffs->state = FFS_CLOSING; | |
1383 | ffs_data_reset(ffs); | |
1384 | } | |
1385 | ||
1386 | ffs_data_put(ffs); | |
1387 | } | |
1388 | ||
ddf8abd2 MN |
1389 | static struct ffs_data *ffs_data_new(void) |
1390 | { | |
1391 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); | |
1392 | if (unlikely(!ffs)) | |
f8800d47 | 1393 | return NULL; |
ddf8abd2 MN |
1394 | |
1395 | ENTER(); | |
1396 | ||
1397 | atomic_set(&ffs->ref, 1); | |
1398 | atomic_set(&ffs->opened, 0); | |
1399 | ffs->state = FFS_READ_DESCRIPTORS; | |
1400 | mutex_init(&ffs->mutex); | |
1401 | spin_lock_init(&ffs->eps_lock); | |
1402 | init_waitqueue_head(&ffs->ev.waitq); | |
1403 | init_completion(&ffs->ep0req_completion); | |
1404 | ||
1405 | /* XXX REVISIT need to update it in some places, or do we? */ | |
1406 | ffs->ev.can_stall = 1; | |
1407 | ||
1408 | return ffs; | |
1409 | } | |
1410 | ||
ddf8abd2 MN |
1411 | static void ffs_data_clear(struct ffs_data *ffs) |
1412 | { | |
1413 | ENTER(); | |
1414 | ||
1415 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags)) | |
4b187fce | 1416 | ffs_closed(ffs); |
ddf8abd2 MN |
1417 | |
1418 | BUG_ON(ffs->gadget); | |
1419 | ||
1420 | if (ffs->epfiles) | |
1421 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); | |
1422 | ||
ac8dde11 | 1423 | kfree(ffs->raw_descs_data); |
ddf8abd2 MN |
1424 | kfree(ffs->raw_strings); |
1425 | kfree(ffs->stringtabs); | |
1426 | } | |
1427 | ||
ddf8abd2 MN |
1428 | static void ffs_data_reset(struct ffs_data *ffs) |
1429 | { | |
1430 | ENTER(); | |
1431 | ||
1432 | ffs_data_clear(ffs); | |
1433 | ||
1434 | ffs->epfiles = NULL; | |
ac8dde11 | 1435 | ffs->raw_descs_data = NULL; |
ddf8abd2 MN |
1436 | ffs->raw_descs = NULL; |
1437 | ffs->raw_strings = NULL; | |
1438 | ffs->stringtabs = NULL; | |
1439 | ||
1440 | ffs->raw_descs_length = 0; | |
ddf8abd2 MN |
1441 | ffs->fs_descs_count = 0; |
1442 | ffs->hs_descs_count = 0; | |
8d4e897b | 1443 | ffs->ss_descs_count = 0; |
ddf8abd2 MN |
1444 | |
1445 | ffs->strings_count = 0; | |
1446 | ffs->interfaces_count = 0; | |
1447 | ffs->eps_count = 0; | |
1448 | ||
1449 | ffs->ev.count = 0; | |
1450 | ||
1451 | ffs->state = FFS_READ_DESCRIPTORS; | |
1452 | ffs->setup_state = FFS_NO_SETUP; | |
1453 | ffs->flags = 0; | |
1454 | } | |
1455 | ||
1456 | ||
1457 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) | |
1458 | { | |
fd7c9a00 MN |
1459 | struct usb_gadget_strings **lang; |
1460 | int first_id; | |
ddf8abd2 MN |
1461 | |
1462 | ENTER(); | |
1463 | ||
1464 | if (WARN_ON(ffs->state != FFS_ACTIVE | |
1465 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) | |
1466 | return -EBADFD; | |
1467 | ||
fd7c9a00 MN |
1468 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
1469 | if (unlikely(first_id < 0)) | |
1470 | return first_id; | |
ddf8abd2 MN |
1471 | |
1472 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); | |
1473 | if (unlikely(!ffs->ep0req)) | |
1474 | return -ENOMEM; | |
1475 | ffs->ep0req->complete = ffs_ep0_complete; | |
1476 | ffs->ep0req->context = ffs; | |
1477 | ||
fd7c9a00 MN |
1478 | lang = ffs->stringtabs; |
1479 | for (lang = ffs->stringtabs; *lang; ++lang) { | |
1480 | struct usb_string *str = (*lang)->strings; | |
1481 | int id = first_id; | |
1482 | for (; str->s; ++id, ++str) | |
1483 | str->id = id; | |
ddf8abd2 MN |
1484 | } |
1485 | ||
1486 | ffs->gadget = cdev->gadget; | |
fd7c9a00 | 1487 | ffs_data_get(ffs); |
ddf8abd2 MN |
1488 | return 0; |
1489 | } | |
1490 | ||
ddf8abd2 MN |
1491 | static void functionfs_unbind(struct ffs_data *ffs) |
1492 | { | |
1493 | ENTER(); | |
1494 | ||
1495 | if (!WARN_ON(!ffs->gadget)) { | |
1496 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); | |
1497 | ffs->ep0req = NULL; | |
1498 | ffs->gadget = NULL; | |
e2190a97 | 1499 | clear_bit(FFS_FL_BOUND, &ffs->flags); |
df498995 | 1500 | ffs_data_put(ffs); |
ddf8abd2 MN |
1501 | } |
1502 | } | |
1503 | ||
ddf8abd2 MN |
1504 | static int ffs_epfiles_create(struct ffs_data *ffs) |
1505 | { | |
1506 | struct ffs_epfile *epfile, *epfiles; | |
1507 | unsigned i, count; | |
1508 | ||
1509 | ENTER(); | |
1510 | ||
1511 | count = ffs->eps_count; | |
9823a525 | 1512 | epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL); |
ddf8abd2 MN |
1513 | if (!epfiles) |
1514 | return -ENOMEM; | |
1515 | ||
1516 | epfile = epfiles; | |
1517 | for (i = 1; i <= count; ++i, ++epfile) { | |
1518 | epfile->ffs = ffs; | |
1519 | mutex_init(&epfile->mutex); | |
1520 | init_waitqueue_head(&epfile->wait); | |
1521 | sprintf(epfiles->name, "ep%u", i); | |
1522 | if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile, | |
1523 | &ffs_epfile_operations, | |
1524 | &epfile->dentry))) { | |
1525 | ffs_epfiles_destroy(epfiles, i - 1); | |
1526 | return -ENOMEM; | |
1527 | } | |
1528 | } | |
1529 | ||
1530 | ffs->epfiles = epfiles; | |
1531 | return 0; | |
1532 | } | |
1533 | ||
ddf8abd2 MN |
1534 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
1535 | { | |
1536 | struct ffs_epfile *epfile = epfiles; | |
1537 | ||
1538 | ENTER(); | |
1539 | ||
1540 | for (; count; --count, ++epfile) { | |
1541 | BUG_ON(mutex_is_locked(&epfile->mutex) || | |
1542 | waitqueue_active(&epfile->wait)); | |
1543 | if (epfile->dentry) { | |
1544 | d_delete(epfile->dentry); | |
1545 | dput(epfile->dentry); | |
1546 | epfile->dentry = NULL; | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | kfree(epfiles); | |
1551 | } | |
1552 | ||
5920cda6 | 1553 | |
ddf8abd2 MN |
1554 | static void ffs_func_eps_disable(struct ffs_function *func) |
1555 | { | |
1556 | struct ffs_ep *ep = func->eps; | |
1557 | struct ffs_epfile *epfile = func->ffs->epfiles; | |
1558 | unsigned count = func->ffs->eps_count; | |
1559 | unsigned long flags; | |
1560 | ||
1561 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1562 | do { | |
1563 | /* pending requests get nuked */ | |
1564 | if (likely(ep->ep)) | |
1565 | usb_ep_disable(ep->ep); | |
1566 | epfile->ep = NULL; | |
1567 | ||
1568 | ++ep; | |
1569 | ++epfile; | |
1570 | } while (--count); | |
1571 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1572 | } | |
1573 | ||
1574 | static int ffs_func_eps_enable(struct ffs_function *func) | |
1575 | { | |
1576 | struct ffs_data *ffs = func->ffs; | |
1577 | struct ffs_ep *ep = func->eps; | |
1578 | struct ffs_epfile *epfile = ffs->epfiles; | |
1579 | unsigned count = ffs->eps_count; | |
1580 | unsigned long flags; | |
1581 | int ret = 0; | |
1582 | ||
1583 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1584 | do { | |
1585 | struct usb_endpoint_descriptor *ds; | |
8d4e897b MG |
1586 | int desc_idx; |
1587 | ||
1588 | if (ffs->gadget->speed == USB_SPEED_SUPER) | |
1589 | desc_idx = 2; | |
1590 | else if (ffs->gadget->speed == USB_SPEED_HIGH) | |
1591 | desc_idx = 1; | |
1592 | else | |
1593 | desc_idx = 0; | |
1594 | ||
1595 | /* fall-back to lower speed if desc missing for current speed */ | |
1596 | do { | |
1597 | ds = ep->descs[desc_idx]; | |
1598 | } while (!ds && --desc_idx >= 0); | |
1599 | ||
1600 | if (!ds) { | |
1601 | ret = -EINVAL; | |
1602 | break; | |
1603 | } | |
ddf8abd2 MN |
1604 | |
1605 | ep->ep->driver_data = ep; | |
72c973dd TB |
1606 | ep->ep->desc = ds; |
1607 | ret = usb_ep_enable(ep->ep); | |
ddf8abd2 MN |
1608 | if (likely(!ret)) { |
1609 | epfile->ep = ep; | |
1610 | epfile->in = usb_endpoint_dir_in(ds); | |
1611 | epfile->isoc = usb_endpoint_xfer_isoc(ds); | |
1612 | } else { | |
1613 | break; | |
1614 | } | |
1615 | ||
1616 | wake_up(&epfile->wait); | |
1617 | ||
1618 | ++ep; | |
1619 | ++epfile; | |
1620 | } while (--count); | |
1621 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1622 | ||
1623 | return ret; | |
1624 | } | |
1625 | ||
1626 | ||
1627 | /* Parsing and building descriptors and strings *****************************/ | |
1628 | ||
5ab54cf7 MN |
1629 | /* |
1630 | * This validates if data pointed by data is a valid USB descriptor as | |
ddf8abd2 | 1631 | * well as record how many interfaces, endpoints and strings are |
5ab54cf7 MN |
1632 | * required by given configuration. Returns address after the |
1633 | * descriptor or NULL if data is invalid. | |
1634 | */ | |
ddf8abd2 MN |
1635 | |
1636 | enum ffs_entity_type { | |
1637 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT | |
1638 | }; | |
1639 | ||
1640 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, | |
1641 | u8 *valuep, | |
1642 | struct usb_descriptor_header *desc, | |
1643 | void *priv); | |
1644 | ||
1645 | static int __must_check ffs_do_desc(char *data, unsigned len, | |
1646 | ffs_entity_callback entity, void *priv) | |
1647 | { | |
1648 | struct usb_descriptor_header *_ds = (void *)data; | |
1649 | u8 length; | |
1650 | int ret; | |
1651 | ||
1652 | ENTER(); | |
1653 | ||
1654 | /* At least two bytes are required: length and type */ | |
1655 | if (len < 2) { | |
aa02f172 | 1656 | pr_vdebug("descriptor too short\n"); |
ddf8abd2 MN |
1657 | return -EINVAL; |
1658 | } | |
1659 | ||
1660 | /* If we have at least as many bytes as the descriptor takes? */ | |
1661 | length = _ds->bLength; | |
1662 | if (len < length) { | |
aa02f172 | 1663 | pr_vdebug("descriptor longer then available data\n"); |
ddf8abd2 MN |
1664 | return -EINVAL; |
1665 | } | |
1666 | ||
1667 | #define __entity_check_INTERFACE(val) 1 | |
1668 | #define __entity_check_STRING(val) (val) | |
1669 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) | |
1670 | #define __entity(type, val) do { \ | |
aa02f172 | 1671 | pr_vdebug("entity " #type "(%02x)\n", (val)); \ |
ddf8abd2 | 1672 | if (unlikely(!__entity_check_ ##type(val))) { \ |
aa02f172 | 1673 | pr_vdebug("invalid entity's value\n"); \ |
ddf8abd2 MN |
1674 | return -EINVAL; \ |
1675 | } \ | |
1676 | ret = entity(FFS_ ##type, &val, _ds, priv); \ | |
1677 | if (unlikely(ret < 0)) { \ | |
aa02f172 | 1678 | pr_debug("entity " #type "(%02x); ret = %d\n", \ |
d8df0b61 | 1679 | (val), ret); \ |
ddf8abd2 MN |
1680 | return ret; \ |
1681 | } \ | |
1682 | } while (0) | |
1683 | ||
1684 | /* Parse descriptor depending on type. */ | |
1685 | switch (_ds->bDescriptorType) { | |
1686 | case USB_DT_DEVICE: | |
1687 | case USB_DT_CONFIG: | |
1688 | case USB_DT_STRING: | |
1689 | case USB_DT_DEVICE_QUALIFIER: | |
1690 | /* function can't have any of those */ | |
aa02f172 | 1691 | pr_vdebug("descriptor reserved for gadget: %d\n", |
5ab54cf7 | 1692 | _ds->bDescriptorType); |
ddf8abd2 MN |
1693 | return -EINVAL; |
1694 | ||
1695 | case USB_DT_INTERFACE: { | |
1696 | struct usb_interface_descriptor *ds = (void *)_ds; | |
aa02f172 | 1697 | pr_vdebug("interface descriptor\n"); |
ddf8abd2 MN |
1698 | if (length != sizeof *ds) |
1699 | goto inv_length; | |
1700 | ||
1701 | __entity(INTERFACE, ds->bInterfaceNumber); | |
1702 | if (ds->iInterface) | |
1703 | __entity(STRING, ds->iInterface); | |
1704 | } | |
1705 | break; | |
1706 | ||
1707 | case USB_DT_ENDPOINT: { | |
1708 | struct usb_endpoint_descriptor *ds = (void *)_ds; | |
aa02f172 | 1709 | pr_vdebug("endpoint descriptor\n"); |
ddf8abd2 MN |
1710 | if (length != USB_DT_ENDPOINT_SIZE && |
1711 | length != USB_DT_ENDPOINT_AUDIO_SIZE) | |
1712 | goto inv_length; | |
1713 | __entity(ENDPOINT, ds->bEndpointAddress); | |
1714 | } | |
1715 | break; | |
1716 | ||
560f1187 KB |
1717 | case HID_DT_HID: |
1718 | pr_vdebug("hid descriptor\n"); | |
1719 | if (length != sizeof(struct hid_descriptor)) | |
1720 | goto inv_length; | |
1721 | break; | |
1722 | ||
ddf8abd2 MN |
1723 | case USB_DT_OTG: |
1724 | if (length != sizeof(struct usb_otg_descriptor)) | |
1725 | goto inv_length; | |
1726 | break; | |
1727 | ||
1728 | case USB_DT_INTERFACE_ASSOCIATION: { | |
1729 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; | |
aa02f172 | 1730 | pr_vdebug("interface association descriptor\n"); |
ddf8abd2 MN |
1731 | if (length != sizeof *ds) |
1732 | goto inv_length; | |
1733 | if (ds->iFunction) | |
1734 | __entity(STRING, ds->iFunction); | |
1735 | } | |
1736 | break; | |
1737 | ||
8d4e897b MG |
1738 | case USB_DT_SS_ENDPOINT_COMP: |
1739 | pr_vdebug("EP SS companion descriptor\n"); | |
1740 | if (length != sizeof(struct usb_ss_ep_comp_descriptor)) | |
1741 | goto inv_length; | |
1742 | break; | |
1743 | ||
ddf8abd2 MN |
1744 | case USB_DT_OTHER_SPEED_CONFIG: |
1745 | case USB_DT_INTERFACE_POWER: | |
1746 | case USB_DT_DEBUG: | |
1747 | case USB_DT_SECURITY: | |
1748 | case USB_DT_CS_RADIO_CONTROL: | |
1749 | /* TODO */ | |
aa02f172 | 1750 | pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1751 | return -EINVAL; |
1752 | ||
1753 | default: | |
1754 | /* We should never be here */ | |
aa02f172 | 1755 | pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1756 | return -EINVAL; |
1757 | ||
5ab54cf7 | 1758 | inv_length: |
aa02f172 | 1759 | pr_vdebug("invalid length: %d (descriptor %d)\n", |
d8df0b61 | 1760 | _ds->bLength, _ds->bDescriptorType); |
ddf8abd2 MN |
1761 | return -EINVAL; |
1762 | } | |
1763 | ||
1764 | #undef __entity | |
1765 | #undef __entity_check_DESCRIPTOR | |
1766 | #undef __entity_check_INTERFACE | |
1767 | #undef __entity_check_STRING | |
1768 | #undef __entity_check_ENDPOINT | |
1769 | ||
1770 | return length; | |
1771 | } | |
1772 | ||
ddf8abd2 MN |
1773 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
1774 | ffs_entity_callback entity, void *priv) | |
1775 | { | |
1776 | const unsigned _len = len; | |
1777 | unsigned long num = 0; | |
1778 | ||
1779 | ENTER(); | |
1780 | ||
1781 | for (;;) { | |
1782 | int ret; | |
1783 | ||
1784 | if (num == count) | |
1785 | data = NULL; | |
1786 | ||
5ab54cf7 | 1787 | /* Record "descriptor" entity */ |
ddf8abd2 MN |
1788 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
1789 | if (unlikely(ret < 0)) { | |
aa02f172 | 1790 | pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", |
d8df0b61 | 1791 | num, ret); |
ddf8abd2 MN |
1792 | return ret; |
1793 | } | |
1794 | ||
1795 | if (!data) | |
1796 | return _len - len; | |
1797 | ||
1798 | ret = ffs_do_desc(data, len, entity, priv); | |
1799 | if (unlikely(ret < 0)) { | |
aa02f172 | 1800 | pr_debug("%s returns %d\n", __func__, ret); |
ddf8abd2 MN |
1801 | return ret; |
1802 | } | |
1803 | ||
1804 | len -= ret; | |
1805 | data += ret; | |
1806 | ++num; | |
1807 | } | |
1808 | } | |
1809 | ||
ddf8abd2 MN |
1810 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
1811 | u8 *valuep, struct usb_descriptor_header *desc, | |
1812 | void *priv) | |
1813 | { | |
1814 | struct ffs_data *ffs = priv; | |
1815 | ||
1816 | ENTER(); | |
1817 | ||
1818 | switch (type) { | |
1819 | case FFS_DESCRIPTOR: | |
1820 | break; | |
1821 | ||
1822 | case FFS_INTERFACE: | |
5ab54cf7 MN |
1823 | /* |
1824 | * Interfaces are indexed from zero so if we | |
ddf8abd2 | 1825 | * encountered interface "n" then there are at least |
5ab54cf7 MN |
1826 | * "n+1" interfaces. |
1827 | */ | |
ddf8abd2 MN |
1828 | if (*valuep >= ffs->interfaces_count) |
1829 | ffs->interfaces_count = *valuep + 1; | |
1830 | break; | |
1831 | ||
1832 | case FFS_STRING: | |
5ab54cf7 MN |
1833 | /* |
1834 | * Strings are indexed from 1 (0 is magic ;) reserved | |
1835 | * for languages list or some such) | |
1836 | */ | |
ddf8abd2 MN |
1837 | if (*valuep > ffs->strings_count) |
1838 | ffs->strings_count = *valuep; | |
1839 | break; | |
1840 | ||
1841 | case FFS_ENDPOINT: | |
1842 | /* Endpoints are indexed from 1 as well. */ | |
1843 | if ((*valuep & USB_ENDPOINT_NUMBER_MASK) > ffs->eps_count) | |
1844 | ffs->eps_count = (*valuep & USB_ENDPOINT_NUMBER_MASK); | |
1845 | break; | |
1846 | } | |
1847 | ||
1848 | return 0; | |
1849 | } | |
1850 | ||
ddf8abd2 MN |
1851 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
1852 | char *const _data, size_t len) | |
1853 | { | |
ac8dde11 MN |
1854 | char *data = _data, *raw_descs; |
1855 | unsigned counts[3], flags; | |
1856 | int ret = -EINVAL, i; | |
ddf8abd2 MN |
1857 | |
1858 | ENTER(); | |
1859 | ||
ac8dde11 | 1860 | if (get_unaligned_le32(data + 4) != len) |
ddf8abd2 | 1861 | goto error; |
ddf8abd2 | 1862 | |
ac8dde11 MN |
1863 | switch (get_unaligned_le32(data)) { |
1864 | case FUNCTIONFS_DESCRIPTORS_MAGIC: | |
1865 | flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; | |
1866 | data += 8; | |
1867 | len -= 8; | |
1868 | break; | |
1869 | case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: | |
1870 | flags = get_unaligned_le32(data + 8); | |
1871 | if (flags & ~(FUNCTIONFS_HAS_FS_DESC | | |
1872 | FUNCTIONFS_HAS_HS_DESC | | |
1873 | FUNCTIONFS_HAS_SS_DESC)) { | |
1874 | ret = -ENOSYS; | |
ddf8abd2 MN |
1875 | goto error; |
1876 | } | |
ac8dde11 MN |
1877 | data += 12; |
1878 | len -= 12; | |
1879 | break; | |
1880 | default: | |
1881 | goto error; | |
ddf8abd2 | 1882 | } |
ddf8abd2 | 1883 | |
ac8dde11 MN |
1884 | /* Read fs_count, hs_count and ss_count (if present) */ |
1885 | for (i = 0; i < 3; ++i) { | |
1886 | if (!(flags & (1 << i))) { | |
1887 | counts[i] = 0; | |
1888 | } else if (len < 4) { | |
8d4e897b | 1889 | goto error; |
ac8dde11 MN |
1890 | } else { |
1891 | counts[i] = get_unaligned_le32(data); | |
1892 | data += 4; | |
1893 | len -= 4; | |
8d4e897b | 1894 | } |
ddf8abd2 MN |
1895 | } |
1896 | ||
ac8dde11 MN |
1897 | /* Read descriptors */ |
1898 | raw_descs = data; | |
1899 | for (i = 0; i < 3; ++i) { | |
1900 | if (!counts[i]) | |
1901 | continue; | |
1902 | ret = ffs_do_descs(counts[i], data, len, | |
ddf8abd2 | 1903 | __ffs_data_do_entity, ffs); |
ac8dde11 | 1904 | if (ret < 0) |
ddf8abd2 | 1905 | goto error; |
ac8dde11 MN |
1906 | data += ret; |
1907 | len -= ret; | |
ddf8abd2 MN |
1908 | } |
1909 | ||
ac8dde11 MN |
1910 | if (raw_descs == data || len) { |
1911 | ret = -EINVAL; | |
1912 | goto error; | |
1913 | } | |
ddf8abd2 | 1914 | |
ac8dde11 MN |
1915 | ffs->raw_descs_data = _data; |
1916 | ffs->raw_descs = raw_descs; | |
1917 | ffs->raw_descs_length = data - raw_descs; | |
1918 | ffs->fs_descs_count = counts[0]; | |
1919 | ffs->hs_descs_count = counts[1]; | |
1920 | ffs->ss_descs_count = counts[2]; | |
ddf8abd2 MN |
1921 | |
1922 | return 0; | |
1923 | ||
ddf8abd2 MN |
1924 | error: |
1925 | kfree(_data); | |
1926 | return ret; | |
1927 | } | |
1928 | ||
ddf8abd2 MN |
1929 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
1930 | char *const _data, size_t len) | |
1931 | { | |
1932 | u32 str_count, needed_count, lang_count; | |
1933 | struct usb_gadget_strings **stringtabs, *t; | |
1934 | struct usb_string *strings, *s; | |
1935 | const char *data = _data; | |
1936 | ||
1937 | ENTER(); | |
1938 | ||
1939 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || | |
1940 | get_unaligned_le32(data + 4) != len)) | |
1941 | goto error; | |
1942 | str_count = get_unaligned_le32(data + 8); | |
1943 | lang_count = get_unaligned_le32(data + 12); | |
1944 | ||
1945 | /* if one is zero the other must be zero */ | |
1946 | if (unlikely(!str_count != !lang_count)) | |
1947 | goto error; | |
1948 | ||
1949 | /* Do we have at least as many strings as descriptors need? */ | |
1950 | needed_count = ffs->strings_count; | |
1951 | if (unlikely(str_count < needed_count)) | |
1952 | goto error; | |
1953 | ||
5ab54cf7 MN |
1954 | /* |
1955 | * If we don't need any strings just return and free all | |
1956 | * memory. | |
1957 | */ | |
ddf8abd2 MN |
1958 | if (!needed_count) { |
1959 | kfree(_data); | |
1960 | return 0; | |
1961 | } | |
1962 | ||
5ab54cf7 | 1963 | /* Allocate everything in one chunk so there's less maintenance. */ |
ddf8abd2 | 1964 | { |
ddf8abd2 | 1965 | unsigned i = 0; |
e6f3862f AP |
1966 | vla_group(d); |
1967 | vla_item(d, struct usb_gadget_strings *, stringtabs, | |
1968 | lang_count + 1); | |
1969 | vla_item(d, struct usb_gadget_strings, stringtab, lang_count); | |
1970 | vla_item(d, struct usb_string, strings, | |
1971 | lang_count*(needed_count+1)); | |
ddf8abd2 | 1972 | |
e6f3862f AP |
1973 | char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); |
1974 | ||
1975 | if (unlikely(!vlabuf)) { | |
ddf8abd2 MN |
1976 | kfree(_data); |
1977 | return -ENOMEM; | |
1978 | } | |
1979 | ||
e6f3862f AP |
1980 | /* Initialize the VLA pointers */ |
1981 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
1982 | t = vla_ptr(vlabuf, d, stringtab); | |
ddf8abd2 MN |
1983 | i = lang_count; |
1984 | do { | |
1985 | *stringtabs++ = t++; | |
1986 | } while (--i); | |
1987 | *stringtabs = NULL; | |
1988 | ||
e6f3862f AP |
1989 | /* stringtabs = vlabuf = d_stringtabs for later kfree */ |
1990 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
1991 | t = vla_ptr(vlabuf, d, stringtab); | |
1992 | s = vla_ptr(vlabuf, d, strings); | |
ddf8abd2 MN |
1993 | strings = s; |
1994 | } | |
1995 | ||
1996 | /* For each language */ | |
1997 | data += 16; | |
1998 | len -= 16; | |
1999 | ||
2000 | do { /* lang_count > 0 so we can use do-while */ | |
2001 | unsigned needed = needed_count; | |
2002 | ||
2003 | if (unlikely(len < 3)) | |
2004 | goto error_free; | |
2005 | t->language = get_unaligned_le16(data); | |
2006 | t->strings = s; | |
2007 | ++t; | |
2008 | ||
2009 | data += 2; | |
2010 | len -= 2; | |
2011 | ||
2012 | /* For each string */ | |
2013 | do { /* str_count > 0 so we can use do-while */ | |
2014 | size_t length = strnlen(data, len); | |
2015 | ||
2016 | if (unlikely(length == len)) | |
2017 | goto error_free; | |
2018 | ||
5ab54cf7 MN |
2019 | /* |
2020 | * User may provide more strings then we need, | |
2021 | * if that's the case we simply ignore the | |
2022 | * rest | |
2023 | */ | |
ddf8abd2 | 2024 | if (likely(needed)) { |
5ab54cf7 MN |
2025 | /* |
2026 | * s->id will be set while adding | |
ddf8abd2 | 2027 | * function to configuration so for |
5ab54cf7 MN |
2028 | * now just leave garbage here. |
2029 | */ | |
ddf8abd2 MN |
2030 | s->s = data; |
2031 | --needed; | |
2032 | ++s; | |
2033 | } | |
2034 | ||
2035 | data += length + 1; | |
2036 | len -= length + 1; | |
2037 | } while (--str_count); | |
2038 | ||
2039 | s->id = 0; /* terminator */ | |
2040 | s->s = NULL; | |
2041 | ++s; | |
2042 | ||
2043 | } while (--lang_count); | |
2044 | ||
2045 | /* Some garbage left? */ | |
2046 | if (unlikely(len)) | |
2047 | goto error_free; | |
2048 | ||
2049 | /* Done! */ | |
2050 | ffs->stringtabs = stringtabs; | |
2051 | ffs->raw_strings = _data; | |
2052 | ||
2053 | return 0; | |
2054 | ||
2055 | error_free: | |
2056 | kfree(stringtabs); | |
2057 | error: | |
2058 | kfree(_data); | |
2059 | return -EINVAL; | |
2060 | } | |
2061 | ||
2062 | ||
ddf8abd2 MN |
2063 | /* Events handling and management *******************************************/ |
2064 | ||
2065 | static void __ffs_event_add(struct ffs_data *ffs, | |
2066 | enum usb_functionfs_event_type type) | |
2067 | { | |
2068 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; | |
2069 | int neg = 0; | |
2070 | ||
5ab54cf7 MN |
2071 | /* |
2072 | * Abort any unhandled setup | |
2073 | * | |
2074 | * We do not need to worry about some cmpxchg() changing value | |
ddf8abd2 MN |
2075 | * of ffs->setup_state without holding the lock because when |
2076 | * state is FFS_SETUP_PENDING cmpxchg() in several places in | |
5ab54cf7 MN |
2077 | * the source does nothing. |
2078 | */ | |
ddf8abd2 | 2079 | if (ffs->setup_state == FFS_SETUP_PENDING) |
e46318a0 | 2080 | ffs->setup_state = FFS_SETUP_CANCELLED; |
ddf8abd2 MN |
2081 | |
2082 | switch (type) { | |
2083 | case FUNCTIONFS_RESUME: | |
2084 | rem_type2 = FUNCTIONFS_SUSPEND; | |
5ab54cf7 | 2085 | /* FALL THROUGH */ |
ddf8abd2 MN |
2086 | case FUNCTIONFS_SUSPEND: |
2087 | case FUNCTIONFS_SETUP: | |
2088 | rem_type1 = type; | |
5ab54cf7 | 2089 | /* Discard all similar events */ |
ddf8abd2 MN |
2090 | break; |
2091 | ||
2092 | case FUNCTIONFS_BIND: | |
2093 | case FUNCTIONFS_UNBIND: | |
2094 | case FUNCTIONFS_DISABLE: | |
2095 | case FUNCTIONFS_ENABLE: | |
5ab54cf7 | 2096 | /* Discard everything other then power management. */ |
ddf8abd2 MN |
2097 | rem_type1 = FUNCTIONFS_SUSPEND; |
2098 | rem_type2 = FUNCTIONFS_RESUME; | |
2099 | neg = 1; | |
2100 | break; | |
2101 | ||
2102 | default: | |
2103 | BUG(); | |
2104 | } | |
2105 | ||
2106 | { | |
2107 | u8 *ev = ffs->ev.types, *out = ev; | |
2108 | unsigned n = ffs->ev.count; | |
2109 | for (; n; --n, ++ev) | |
2110 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) | |
2111 | *out++ = *ev; | |
2112 | else | |
aa02f172 | 2113 | pr_vdebug("purging event %d\n", *ev); |
ddf8abd2 MN |
2114 | ffs->ev.count = out - ffs->ev.types; |
2115 | } | |
2116 | ||
aa02f172 | 2117 | pr_vdebug("adding event %d\n", type); |
ddf8abd2 MN |
2118 | ffs->ev.types[ffs->ev.count++] = type; |
2119 | wake_up_locked(&ffs->ev.waitq); | |
2120 | } | |
2121 | ||
2122 | static void ffs_event_add(struct ffs_data *ffs, | |
2123 | enum usb_functionfs_event_type type) | |
2124 | { | |
2125 | unsigned long flags; | |
2126 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2127 | __ffs_event_add(ffs, type); | |
2128 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2129 | } | |
2130 | ||
2131 | ||
2132 | /* Bind/unbind USB function hooks *******************************************/ | |
2133 | ||
2134 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, | |
2135 | struct usb_descriptor_header *desc, | |
2136 | void *priv) | |
2137 | { | |
2138 | struct usb_endpoint_descriptor *ds = (void *)desc; | |
2139 | struct ffs_function *func = priv; | |
2140 | struct ffs_ep *ffs_ep; | |
8d4e897b MG |
2141 | unsigned ep_desc_id, idx; |
2142 | static const char *speed_names[] = { "full", "high", "super" }; | |
ddf8abd2 MN |
2143 | |
2144 | if (type != FFS_DESCRIPTOR) | |
2145 | return 0; | |
2146 | ||
8d4e897b MG |
2147 | /* |
2148 | * If ss_descriptors is not NULL, we are reading super speed | |
2149 | * descriptors; if hs_descriptors is not NULL, we are reading high | |
2150 | * speed descriptors; otherwise, we are reading full speed | |
2151 | * descriptors. | |
2152 | */ | |
2153 | if (func->function.ss_descriptors) { | |
2154 | ep_desc_id = 2; | |
2155 | func->function.ss_descriptors[(long)valuep] = desc; | |
2156 | } else if (func->function.hs_descriptors) { | |
2157 | ep_desc_id = 1; | |
ddf8abd2 | 2158 | func->function.hs_descriptors[(long)valuep] = desc; |
8d4e897b MG |
2159 | } else { |
2160 | ep_desc_id = 0; | |
10287bae | 2161 | func->function.fs_descriptors[(long)valuep] = desc; |
8d4e897b | 2162 | } |
ddf8abd2 MN |
2163 | |
2164 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) | |
2165 | return 0; | |
2166 | ||
2167 | idx = (ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2168 | ffs_ep = func->eps + idx; | |
2169 | ||
8d4e897b MG |
2170 | if (unlikely(ffs_ep->descs[ep_desc_id])) { |
2171 | pr_err("two %sspeed descriptors for EP %d\n", | |
2172 | speed_names[ep_desc_id], | |
d8df0b61 | 2173 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
ddf8abd2 MN |
2174 | return -EINVAL; |
2175 | } | |
8d4e897b | 2176 | ffs_ep->descs[ep_desc_id] = ds; |
ddf8abd2 MN |
2177 | |
2178 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); | |
2179 | if (ffs_ep->ep) { | |
2180 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; | |
2181 | if (!ds->wMaxPacketSize) | |
2182 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; | |
2183 | } else { | |
2184 | struct usb_request *req; | |
2185 | struct usb_ep *ep; | |
2186 | ||
aa02f172 | 2187 | pr_vdebug("autoconfig\n"); |
ddf8abd2 MN |
2188 | ep = usb_ep_autoconfig(func->gadget, ds); |
2189 | if (unlikely(!ep)) | |
2190 | return -ENOTSUPP; | |
cc7e6056 | 2191 | ep->driver_data = func->eps + idx; |
ddf8abd2 MN |
2192 | |
2193 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
2194 | if (unlikely(!req)) | |
2195 | return -ENOMEM; | |
2196 | ||
2197 | ffs_ep->ep = ep; | |
2198 | ffs_ep->req = req; | |
2199 | func->eps_revmap[ds->bEndpointAddress & | |
2200 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; | |
2201 | } | |
2202 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); | |
2203 | ||
2204 | return 0; | |
2205 | } | |
2206 | ||
ddf8abd2 MN |
2207 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, |
2208 | struct usb_descriptor_header *desc, | |
2209 | void *priv) | |
2210 | { | |
2211 | struct ffs_function *func = priv; | |
2212 | unsigned idx; | |
2213 | u8 newValue; | |
2214 | ||
2215 | switch (type) { | |
2216 | default: | |
2217 | case FFS_DESCRIPTOR: | |
2218 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ | |
2219 | return 0; | |
2220 | ||
2221 | case FFS_INTERFACE: | |
2222 | idx = *valuep; | |
2223 | if (func->interfaces_nums[idx] < 0) { | |
2224 | int id = usb_interface_id(func->conf, &func->function); | |
2225 | if (unlikely(id < 0)) | |
2226 | return id; | |
2227 | func->interfaces_nums[idx] = id; | |
2228 | } | |
2229 | newValue = func->interfaces_nums[idx]; | |
2230 | break; | |
2231 | ||
2232 | case FFS_STRING: | |
2233 | /* String' IDs are allocated when fsf_data is bound to cdev */ | |
2234 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; | |
2235 | break; | |
2236 | ||
2237 | case FFS_ENDPOINT: | |
5ab54cf7 MN |
2238 | /* |
2239 | * USB_DT_ENDPOINT are handled in | |
2240 | * __ffs_func_bind_do_descs(). | |
2241 | */ | |
ddf8abd2 MN |
2242 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
2243 | return 0; | |
2244 | ||
2245 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2246 | if (unlikely(!func->eps[idx].ep)) | |
2247 | return -EINVAL; | |
2248 | ||
2249 | { | |
2250 | struct usb_endpoint_descriptor **descs; | |
2251 | descs = func->eps[idx].descs; | |
2252 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; | |
2253 | } | |
2254 | break; | |
2255 | } | |
2256 | ||
aa02f172 | 2257 | pr_vdebug("%02x -> %02x\n", *valuep, newValue); |
ddf8abd2 MN |
2258 | *valuep = newValue; |
2259 | return 0; | |
2260 | } | |
2261 | ||
5920cda6 AP |
2262 | static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, |
2263 | struct usb_configuration *c) | |
2264 | { | |
2265 | struct ffs_function *func = ffs_func_from_usb(f); | |
2266 | struct f_fs_opts *ffs_opts = | |
2267 | container_of(f->fi, struct f_fs_opts, func_inst); | |
2268 | int ret; | |
2269 | ||
2270 | ENTER(); | |
2271 | ||
2272 | /* | |
2273 | * Legacy gadget triggers binding in functionfs_ready_callback, | |
2274 | * which already uses locking; taking the same lock here would | |
2275 | * cause a deadlock. | |
2276 | * | |
2277 | * Configfs-enabled gadgets however do need ffs_dev_lock. | |
2278 | */ | |
2279 | if (!ffs_opts->no_configfs) | |
2280 | ffs_dev_lock(); | |
2281 | ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; | |
2282 | func->ffs = ffs_opts->dev->ffs_data; | |
2283 | if (!ffs_opts->no_configfs) | |
2284 | ffs_dev_unlock(); | |
2285 | if (ret) | |
2286 | return ERR_PTR(ret); | |
2287 | ||
2288 | func->conf = c; | |
2289 | func->gadget = c->cdev->gadget; | |
2290 | ||
2291 | ffs_data_get(func->ffs); | |
2292 | ||
2293 | /* | |
2294 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
2295 | * configurations are bound in sequence with list_for_each_entry, | |
2296 | * in each configuration its functions are bound in sequence | |
2297 | * with list_for_each_entry, so we assume no race condition | |
2298 | * with regard to ffs_opts->bound access | |
2299 | */ | |
2300 | if (!ffs_opts->refcnt) { | |
2301 | ret = functionfs_bind(func->ffs, c->cdev); | |
2302 | if (ret) | |
2303 | return ERR_PTR(ret); | |
2304 | } | |
2305 | ffs_opts->refcnt++; | |
2306 | func->function.strings = func->ffs->stringtabs; | |
2307 | ||
2308 | return ffs_opts; | |
2309 | } | |
5920cda6 AP |
2310 | |
2311 | static int _ffs_func_bind(struct usb_configuration *c, | |
2312 | struct usb_function *f) | |
ddf8abd2 MN |
2313 | { |
2314 | struct ffs_function *func = ffs_func_from_usb(f); | |
2315 | struct ffs_data *ffs = func->ffs; | |
2316 | ||
2317 | const int full = !!func->ffs->fs_descs_count; | |
2318 | const int high = gadget_is_dualspeed(func->gadget) && | |
2319 | func->ffs->hs_descs_count; | |
8d4e897b MG |
2320 | const int super = gadget_is_superspeed(func->gadget) && |
2321 | func->ffs->ss_descs_count; | |
ddf8abd2 | 2322 | |
8d4e897b | 2323 | int fs_len, hs_len, ret; |
ddf8abd2 MN |
2324 | |
2325 | /* Make it a single chunk, less management later on */ | |
e6f3862f AP |
2326 | vla_group(d); |
2327 | vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); | |
2328 | vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, | |
2329 | full ? ffs->fs_descs_count + 1 : 0); | |
2330 | vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, | |
2331 | high ? ffs->hs_descs_count + 1 : 0); | |
8d4e897b MG |
2332 | vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, |
2333 | super ? ffs->ss_descs_count + 1 : 0); | |
e6f3862f | 2334 | vla_item_with_sz(d, short, inums, ffs->interfaces_count); |
ac8dde11 | 2335 | vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); |
e6f3862f | 2336 | char *vlabuf; |
ddf8abd2 MN |
2337 | |
2338 | ENTER(); | |
2339 | ||
8d4e897b MG |
2340 | /* Has descriptors only for speeds gadget does not support */ |
2341 | if (unlikely(!(full | high | super))) | |
ddf8abd2 MN |
2342 | return -ENOTSUPP; |
2343 | ||
e6f3862f AP |
2344 | /* Allocate a single chunk, less management later on */ |
2345 | vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); | |
2346 | if (unlikely(!vlabuf)) | |
ddf8abd2 MN |
2347 | return -ENOMEM; |
2348 | ||
2349 | /* Zero */ | |
e6f3862f | 2350 | memset(vla_ptr(vlabuf, d, eps), 0, d_eps__sz); |
ac8dde11 MN |
2351 | /* Copy descriptors */ |
2352 | memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, | |
2353 | ffs->raw_descs_length); | |
8d4e897b | 2354 | |
e6f3862f AP |
2355 | memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); |
2356 | for (ret = ffs->eps_count; ret; --ret) { | |
2357 | struct ffs_ep *ptr; | |
2358 | ||
2359 | ptr = vla_ptr(vlabuf, d, eps); | |
2360 | ptr[ret].num = -1; | |
2361 | } | |
ddf8abd2 | 2362 | |
e6f3862f AP |
2363 | /* Save pointers |
2364 | * d_eps == vlabuf, func->eps used to kfree vlabuf later | |
2365 | */ | |
2366 | func->eps = vla_ptr(vlabuf, d, eps); | |
2367 | func->interfaces_nums = vla_ptr(vlabuf, d, inums); | |
ddf8abd2 | 2368 | |
5ab54cf7 MN |
2369 | /* |
2370 | * Go through all the endpoint descriptors and allocate | |
ddf8abd2 | 2371 | * endpoints first, so that later we can rewrite the endpoint |
5ab54cf7 MN |
2372 | * numbers without worrying that it may be described later on. |
2373 | */ | |
ddf8abd2 | 2374 | if (likely(full)) { |
e6f3862f | 2375 | func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); |
8d4e897b MG |
2376 | fs_len = ffs_do_descs(ffs->fs_descs_count, |
2377 | vla_ptr(vlabuf, d, raw_descs), | |
2378 | d_raw_descs__sz, | |
2379 | __ffs_func_bind_do_descs, func); | |
2380 | if (unlikely(fs_len < 0)) { | |
2381 | ret = fs_len; | |
ddf8abd2 | 2382 | goto error; |
8d4e897b | 2383 | } |
ddf8abd2 | 2384 | } else { |
8d4e897b | 2385 | fs_len = 0; |
ddf8abd2 MN |
2386 | } |
2387 | ||
2388 | if (likely(high)) { | |
e6f3862f | 2389 | func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); |
8d4e897b MG |
2390 | hs_len = ffs_do_descs(ffs->hs_descs_count, |
2391 | vla_ptr(vlabuf, d, raw_descs) + fs_len, | |
2392 | d_raw_descs__sz - fs_len, | |
2393 | __ffs_func_bind_do_descs, func); | |
2394 | if (unlikely(hs_len < 0)) { | |
2395 | ret = hs_len; | |
2396 | goto error; | |
2397 | } | |
2398 | } else { | |
2399 | hs_len = 0; | |
2400 | } | |
2401 | ||
2402 | if (likely(super)) { | |
2403 | func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); | |
2404 | ret = ffs_do_descs(ffs->ss_descs_count, | |
2405 | vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, | |
2406 | d_raw_descs__sz - fs_len - hs_len, | |
2407 | __ffs_func_bind_do_descs, func); | |
8854894c RB |
2408 | if (unlikely(ret < 0)) |
2409 | goto error; | |
ddf8abd2 MN |
2410 | } |
2411 | ||
5ab54cf7 MN |
2412 | /* |
2413 | * Now handle interface numbers allocation and interface and | |
2414 | * endpoint numbers rewriting. We can do that in one go | |
2415 | * now. | |
2416 | */ | |
ddf8abd2 | 2417 | ret = ffs_do_descs(ffs->fs_descs_count + |
8d4e897b MG |
2418 | (high ? ffs->hs_descs_count : 0) + |
2419 | (super ? ffs->ss_descs_count : 0), | |
e6f3862f | 2420 | vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, |
ddf8abd2 MN |
2421 | __ffs_func_bind_do_nums, func); |
2422 | if (unlikely(ret < 0)) | |
2423 | goto error; | |
2424 | ||
2425 | /* And we're done */ | |
2426 | ffs_event_add(ffs, FUNCTIONFS_BIND); | |
2427 | return 0; | |
2428 | ||
2429 | error: | |
2430 | /* XXX Do we need to release all claimed endpoints here? */ | |
2431 | return ret; | |
2432 | } | |
2433 | ||
5920cda6 AP |
2434 | static int ffs_func_bind(struct usb_configuration *c, |
2435 | struct usb_function *f) | |
2436 | { | |
5920cda6 AP |
2437 | struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); |
2438 | ||
2439 | if (IS_ERR(ffs_opts)) | |
2440 | return PTR_ERR(ffs_opts); | |
5920cda6 AP |
2441 | |
2442 | return _ffs_func_bind(c, f); | |
2443 | } | |
2444 | ||
ddf8abd2 MN |
2445 | |
2446 | /* Other USB function hooks *************************************************/ | |
2447 | ||
ddf8abd2 MN |
2448 | static int ffs_func_set_alt(struct usb_function *f, |
2449 | unsigned interface, unsigned alt) | |
2450 | { | |
2451 | struct ffs_function *func = ffs_func_from_usb(f); | |
2452 | struct ffs_data *ffs = func->ffs; | |
2453 | int ret = 0, intf; | |
2454 | ||
2455 | if (alt != (unsigned)-1) { | |
2456 | intf = ffs_func_revmap_intf(func, interface); | |
2457 | if (unlikely(intf < 0)) | |
2458 | return intf; | |
2459 | } | |
2460 | ||
2461 | if (ffs->func) | |
2462 | ffs_func_eps_disable(ffs->func); | |
2463 | ||
2464 | if (ffs->state != FFS_ACTIVE) | |
2465 | return -ENODEV; | |
2466 | ||
2467 | if (alt == (unsigned)-1) { | |
2468 | ffs->func = NULL; | |
2469 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); | |
2470 | return 0; | |
2471 | } | |
2472 | ||
2473 | ffs->func = func; | |
2474 | ret = ffs_func_eps_enable(func); | |
2475 | if (likely(ret >= 0)) | |
2476 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); | |
2477 | return ret; | |
2478 | } | |
2479 | ||
2480 | static void ffs_func_disable(struct usb_function *f) | |
2481 | { | |
2482 | ffs_func_set_alt(f, 0, (unsigned)-1); | |
2483 | } | |
2484 | ||
2485 | static int ffs_func_setup(struct usb_function *f, | |
2486 | const struct usb_ctrlrequest *creq) | |
2487 | { | |
2488 | struct ffs_function *func = ffs_func_from_usb(f); | |
2489 | struct ffs_data *ffs = func->ffs; | |
2490 | unsigned long flags; | |
2491 | int ret; | |
2492 | ||
2493 | ENTER(); | |
2494 | ||
aa02f172 MN |
2495 | pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); |
2496 | pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); | |
2497 | pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); | |
2498 | pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); | |
2499 | pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); | |
ddf8abd2 | 2500 | |
5ab54cf7 MN |
2501 | /* |
2502 | * Most requests directed to interface go through here | |
ddf8abd2 MN |
2503 | * (notable exceptions are set/get interface) so we need to |
2504 | * handle them. All other either handled by composite or | |
2505 | * passed to usb_configuration->setup() (if one is set). No | |
2506 | * matter, we will handle requests directed to endpoint here | |
2507 | * as well (as it's straightforward) but what to do with any | |
5ab54cf7 MN |
2508 | * other request? |
2509 | */ | |
ddf8abd2 MN |
2510 | if (ffs->state != FFS_ACTIVE) |
2511 | return -ENODEV; | |
2512 | ||
2513 | switch (creq->bRequestType & USB_RECIP_MASK) { | |
2514 | case USB_RECIP_INTERFACE: | |
2515 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); | |
2516 | if (unlikely(ret < 0)) | |
2517 | return ret; | |
2518 | break; | |
2519 | ||
2520 | case USB_RECIP_ENDPOINT: | |
2521 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); | |
2522 | if (unlikely(ret < 0)) | |
2523 | return ret; | |
2524 | break; | |
2525 | ||
2526 | default: | |
2527 | return -EOPNOTSUPP; | |
2528 | } | |
2529 | ||
2530 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2531 | ffs->ev.setup = *creq; | |
2532 | ffs->ev.setup.wIndex = cpu_to_le16(ret); | |
2533 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); | |
2534 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2535 | ||
2536 | return 0; | |
2537 | } | |
2538 | ||
2539 | static void ffs_func_suspend(struct usb_function *f) | |
2540 | { | |
2541 | ENTER(); | |
2542 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); | |
2543 | } | |
2544 | ||
2545 | static void ffs_func_resume(struct usb_function *f) | |
2546 | { | |
2547 | ENTER(); | |
2548 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); | |
2549 | } | |
2550 | ||
2551 | ||
5ab54cf7 | 2552 | /* Endpoint and interface numbers reverse mapping ***************************/ |
ddf8abd2 MN |
2553 | |
2554 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) | |
2555 | { | |
2556 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; | |
2557 | return num ? num : -EDOM; | |
2558 | } | |
2559 | ||
2560 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) | |
2561 | { | |
2562 | short *nums = func->interfaces_nums; | |
2563 | unsigned count = func->ffs->interfaces_count; | |
2564 | ||
2565 | for (; count; --count, ++nums) { | |
2566 | if (*nums >= 0 && *nums == intf) | |
2567 | return nums - func->interfaces_nums; | |
2568 | } | |
2569 | ||
2570 | return -EDOM; | |
2571 | } | |
2572 | ||
2573 | ||
4b187fce AP |
2574 | /* Devices management *******************************************************/ |
2575 | ||
2576 | static LIST_HEAD(ffs_devices); | |
2577 | ||
da13a773 | 2578 | static struct ffs_dev *_ffs_do_find_dev(const char *name) |
4b187fce AP |
2579 | { |
2580 | struct ffs_dev *dev; | |
2581 | ||
2582 | list_for_each_entry(dev, &ffs_devices, entry) { | |
2583 | if (!dev->name || !name) | |
2584 | continue; | |
2585 | if (strcmp(dev->name, name) == 0) | |
2586 | return dev; | |
2587 | } | |
b658499f | 2588 | |
4b187fce AP |
2589 | return NULL; |
2590 | } | |
2591 | ||
2592 | /* | |
2593 | * ffs_lock must be taken by the caller of this function | |
2594 | */ | |
da13a773 | 2595 | static struct ffs_dev *_ffs_get_single_dev(void) |
4b187fce AP |
2596 | { |
2597 | struct ffs_dev *dev; | |
2598 | ||
2599 | if (list_is_singular(&ffs_devices)) { | |
2600 | dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); | |
2601 | if (dev->single) | |
2602 | return dev; | |
2603 | } | |
2604 | ||
2605 | return NULL; | |
2606 | } | |
2607 | ||
2608 | /* | |
2609 | * ffs_lock must be taken by the caller of this function | |
2610 | */ | |
da13a773 | 2611 | static struct ffs_dev *_ffs_find_dev(const char *name) |
4b187fce AP |
2612 | { |
2613 | struct ffs_dev *dev; | |
2614 | ||
da13a773 | 2615 | dev = _ffs_get_single_dev(); |
4b187fce AP |
2616 | if (dev) |
2617 | return dev; | |
2618 | ||
da13a773 | 2619 | return _ffs_do_find_dev(name); |
4b187fce AP |
2620 | } |
2621 | ||
b658499f AP |
2622 | /* Configfs support *********************************************************/ |
2623 | ||
2624 | static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) | |
2625 | { | |
2626 | return container_of(to_config_group(item), struct f_fs_opts, | |
2627 | func_inst.group); | |
2628 | } | |
2629 | ||
2630 | static void ffs_attr_release(struct config_item *item) | |
2631 | { | |
2632 | struct f_fs_opts *opts = to_ffs_opts(item); | |
2633 | ||
2634 | usb_put_function_instance(&opts->func_inst); | |
2635 | } | |
2636 | ||
2637 | static struct configfs_item_operations ffs_item_ops = { | |
2638 | .release = ffs_attr_release, | |
2639 | }; | |
2640 | ||
2641 | static struct config_item_type ffs_func_type = { | |
2642 | .ct_item_ops = &ffs_item_ops, | |
2643 | .ct_owner = THIS_MODULE, | |
2644 | }; | |
2645 | ||
2646 | ||
5920cda6 AP |
2647 | /* Function registration interface ******************************************/ |
2648 | ||
5920cda6 AP |
2649 | static void ffs_free_inst(struct usb_function_instance *f) |
2650 | { | |
2651 | struct f_fs_opts *opts; | |
2652 | ||
2653 | opts = to_f_fs_opts(f); | |
2654 | ffs_dev_lock(); | |
da13a773 | 2655 | _ffs_free_dev(opts->dev); |
5920cda6 AP |
2656 | ffs_dev_unlock(); |
2657 | kfree(opts); | |
2658 | } | |
2659 | ||
b658499f AP |
2660 | #define MAX_INST_NAME_LEN 40 |
2661 | ||
2662 | static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) | |
2663 | { | |
2664 | struct f_fs_opts *opts; | |
2665 | char *ptr; | |
2666 | const char *tmp; | |
2667 | int name_len, ret; | |
2668 | ||
2669 | name_len = strlen(name) + 1; | |
2670 | if (name_len > MAX_INST_NAME_LEN) | |
2671 | return -ENAMETOOLONG; | |
2672 | ||
2673 | ptr = kstrndup(name, name_len, GFP_KERNEL); | |
2674 | if (!ptr) | |
2675 | return -ENOMEM; | |
2676 | ||
2677 | opts = to_f_fs_opts(fi); | |
2678 | tmp = NULL; | |
2679 | ||
2680 | ffs_dev_lock(); | |
2681 | ||
2682 | tmp = opts->dev->name_allocated ? opts->dev->name : NULL; | |
2683 | ret = _ffs_name_dev(opts->dev, ptr); | |
2684 | if (ret) { | |
2685 | kfree(ptr); | |
2686 | ffs_dev_unlock(); | |
2687 | return ret; | |
2688 | } | |
2689 | opts->dev->name_allocated = true; | |
2690 | ||
2691 | ffs_dev_unlock(); | |
2692 | ||
2693 | kfree(tmp); | |
2694 | ||
2695 | return 0; | |
2696 | } | |
2697 | ||
5920cda6 AP |
2698 | static struct usb_function_instance *ffs_alloc_inst(void) |
2699 | { | |
2700 | struct f_fs_opts *opts; | |
2701 | struct ffs_dev *dev; | |
2702 | ||
2703 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
2704 | if (!opts) | |
2705 | return ERR_PTR(-ENOMEM); | |
2706 | ||
b658499f | 2707 | opts->func_inst.set_inst_name = ffs_set_inst_name; |
5920cda6 AP |
2708 | opts->func_inst.free_func_inst = ffs_free_inst; |
2709 | ffs_dev_lock(); | |
da13a773 | 2710 | dev = _ffs_alloc_dev(); |
5920cda6 AP |
2711 | ffs_dev_unlock(); |
2712 | if (IS_ERR(dev)) { | |
2713 | kfree(opts); | |
2714 | return ERR_CAST(dev); | |
2715 | } | |
2716 | opts->dev = dev; | |
b658499f | 2717 | dev->opts = opts; |
5920cda6 | 2718 | |
b658499f AP |
2719 | config_group_init_type_name(&opts->func_inst.group, "", |
2720 | &ffs_func_type); | |
5920cda6 AP |
2721 | return &opts->func_inst; |
2722 | } | |
2723 | ||
2724 | static void ffs_free(struct usb_function *f) | |
2725 | { | |
2726 | kfree(ffs_func_from_usb(f)); | |
2727 | } | |
2728 | ||
2729 | static void ffs_func_unbind(struct usb_configuration *c, | |
2730 | struct usb_function *f) | |
2731 | { | |
2732 | struct ffs_function *func = ffs_func_from_usb(f); | |
2733 | struct ffs_data *ffs = func->ffs; | |
2734 | struct f_fs_opts *opts = | |
2735 | container_of(f->fi, struct f_fs_opts, func_inst); | |
2736 | struct ffs_ep *ep = func->eps; | |
2737 | unsigned count = ffs->eps_count; | |
2738 | unsigned long flags; | |
2739 | ||
2740 | ENTER(); | |
2741 | if (ffs->func == func) { | |
2742 | ffs_func_eps_disable(func); | |
2743 | ffs->func = NULL; | |
2744 | } | |
2745 | ||
2746 | if (!--opts->refcnt) | |
2747 | functionfs_unbind(ffs); | |
2748 | ||
2749 | /* cleanup after autoconfig */ | |
2750 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
2751 | do { | |
2752 | if (ep->ep && ep->req) | |
2753 | usb_ep_free_request(ep->ep, ep->req); | |
2754 | ep->req = NULL; | |
2755 | ++ep; | |
2756 | } while (--count); | |
2757 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
2758 | kfree(func->eps); | |
2759 | func->eps = NULL; | |
2760 | /* | |
2761 | * eps, descriptors and interfaces_nums are allocated in the | |
2762 | * same chunk so only one free is required. | |
2763 | */ | |
2764 | func->function.fs_descriptors = NULL; | |
2765 | func->function.hs_descriptors = NULL; | |
8d4e897b | 2766 | func->function.ss_descriptors = NULL; |
5920cda6 AP |
2767 | func->interfaces_nums = NULL; |
2768 | ||
2769 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); | |
2770 | } | |
2771 | ||
2772 | static struct usb_function *ffs_alloc(struct usb_function_instance *fi) | |
2773 | { | |
2774 | struct ffs_function *func; | |
2775 | ||
2776 | ENTER(); | |
2777 | ||
2778 | func = kzalloc(sizeof(*func), GFP_KERNEL); | |
2779 | if (unlikely(!func)) | |
2780 | return ERR_PTR(-ENOMEM); | |
2781 | ||
2782 | func->function.name = "Function FS Gadget"; | |
2783 | ||
2784 | func->function.bind = ffs_func_bind; | |
2785 | func->function.unbind = ffs_func_unbind; | |
2786 | func->function.set_alt = ffs_func_set_alt; | |
2787 | func->function.disable = ffs_func_disable; | |
2788 | func->function.setup = ffs_func_setup; | |
2789 | func->function.suspend = ffs_func_suspend; | |
2790 | func->function.resume = ffs_func_resume; | |
2791 | func->function.free_func = ffs_free; | |
2792 | ||
2793 | return &func->function; | |
2794 | } | |
2795 | ||
4b187fce AP |
2796 | /* |
2797 | * ffs_lock must be taken by the caller of this function | |
2798 | */ | |
da13a773 | 2799 | static struct ffs_dev *_ffs_alloc_dev(void) |
4b187fce AP |
2800 | { |
2801 | struct ffs_dev *dev; | |
2802 | int ret; | |
2803 | ||
da13a773 | 2804 | if (_ffs_get_single_dev()) |
4b187fce AP |
2805 | return ERR_PTR(-EBUSY); |
2806 | ||
2807 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2808 | if (!dev) | |
2809 | return ERR_PTR(-ENOMEM); | |
2810 | ||
2811 | if (list_empty(&ffs_devices)) { | |
2812 | ret = functionfs_init(); | |
2813 | if (ret) { | |
2814 | kfree(dev); | |
2815 | return ERR_PTR(ret); | |
2816 | } | |
2817 | } | |
2818 | ||
2819 | list_add(&dev->entry, &ffs_devices); | |
2820 | ||
2821 | return dev; | |
2822 | } | |
2823 | ||
2824 | /* | |
2825 | * ffs_lock must be taken by the caller of this function | |
2826 | * The caller is responsible for "name" being available whenever f_fs needs it | |
2827 | */ | |
2828 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name) | |
2829 | { | |
2830 | struct ffs_dev *existing; | |
2831 | ||
da13a773 | 2832 | existing = _ffs_do_find_dev(name); |
4b187fce AP |
2833 | if (existing) |
2834 | return -EBUSY; | |
ab13cb0c | 2835 | |
4b187fce AP |
2836 | dev->name = name; |
2837 | ||
2838 | return 0; | |
2839 | } | |
2840 | ||
2841 | /* | |
2842 | * The caller is responsible for "name" being available whenever f_fs needs it | |
2843 | */ | |
2844 | int ffs_name_dev(struct ffs_dev *dev, const char *name) | |
2845 | { | |
2846 | int ret; | |
2847 | ||
2848 | ffs_dev_lock(); | |
2849 | ret = _ffs_name_dev(dev, name); | |
2850 | ffs_dev_unlock(); | |
2851 | ||
2852 | return ret; | |
2853 | } | |
0700faaf | 2854 | EXPORT_SYMBOL_GPL(ffs_name_dev); |
4b187fce AP |
2855 | |
2856 | int ffs_single_dev(struct ffs_dev *dev) | |
2857 | { | |
2858 | int ret; | |
2859 | ||
2860 | ret = 0; | |
2861 | ffs_dev_lock(); | |
2862 | ||
2863 | if (!list_is_singular(&ffs_devices)) | |
2864 | ret = -EBUSY; | |
2865 | else | |
2866 | dev->single = true; | |
2867 | ||
2868 | ffs_dev_unlock(); | |
2869 | return ret; | |
2870 | } | |
0700faaf | 2871 | EXPORT_SYMBOL_GPL(ffs_single_dev); |
4b187fce AP |
2872 | |
2873 | /* | |
2874 | * ffs_lock must be taken by the caller of this function | |
2875 | */ | |
da13a773 | 2876 | static void _ffs_free_dev(struct ffs_dev *dev) |
4b187fce AP |
2877 | { |
2878 | list_del(&dev->entry); | |
b658499f AP |
2879 | if (dev->name_allocated) |
2880 | kfree(dev->name); | |
4b187fce AP |
2881 | kfree(dev); |
2882 | if (list_empty(&ffs_devices)) | |
2883 | functionfs_cleanup(); | |
2884 | } | |
2885 | ||
2886 | static void *ffs_acquire_dev(const char *dev_name) | |
2887 | { | |
2888 | struct ffs_dev *ffs_dev; | |
2889 | ||
2890 | ENTER(); | |
2891 | ffs_dev_lock(); | |
2892 | ||
da13a773 | 2893 | ffs_dev = _ffs_find_dev(dev_name); |
4b187fce AP |
2894 | if (!ffs_dev) |
2895 | ffs_dev = ERR_PTR(-ENODEV); | |
2896 | else if (ffs_dev->mounted) | |
2897 | ffs_dev = ERR_PTR(-EBUSY); | |
5920cda6 AP |
2898 | else if (ffs_dev->ffs_acquire_dev_callback && |
2899 | ffs_dev->ffs_acquire_dev_callback(ffs_dev)) | |
2900 | ffs_dev = ERR_PTR(-ENODEV); | |
4b187fce AP |
2901 | else |
2902 | ffs_dev->mounted = true; | |
2903 | ||
2904 | ffs_dev_unlock(); | |
2905 | return ffs_dev; | |
2906 | } | |
2907 | ||
2908 | static void ffs_release_dev(struct ffs_data *ffs_data) | |
2909 | { | |
2910 | struct ffs_dev *ffs_dev; | |
2911 | ||
2912 | ENTER(); | |
2913 | ffs_dev_lock(); | |
2914 | ||
2915 | ffs_dev = ffs_data->private_data; | |
ea365922 | 2916 | if (ffs_dev) { |
4b187fce | 2917 | ffs_dev->mounted = false; |
ea365922 AP |
2918 | |
2919 | if (ffs_dev->ffs_release_dev_callback) | |
2920 | ffs_dev->ffs_release_dev_callback(ffs_dev); | |
2921 | } | |
4b187fce AP |
2922 | |
2923 | ffs_dev_unlock(); | |
2924 | } | |
2925 | ||
2926 | static int ffs_ready(struct ffs_data *ffs) | |
2927 | { | |
2928 | struct ffs_dev *ffs_obj; | |
2929 | int ret = 0; | |
2930 | ||
2931 | ENTER(); | |
2932 | ffs_dev_lock(); | |
2933 | ||
2934 | ffs_obj = ffs->private_data; | |
2935 | if (!ffs_obj) { | |
2936 | ret = -EINVAL; | |
2937 | goto done; | |
2938 | } | |
2939 | if (WARN_ON(ffs_obj->desc_ready)) { | |
2940 | ret = -EBUSY; | |
2941 | goto done; | |
2942 | } | |
2943 | ||
2944 | ffs_obj->desc_ready = true; | |
2945 | ffs_obj->ffs_data = ffs; | |
2946 | ||
2947 | if (ffs_obj->ffs_ready_callback) | |
2948 | ret = ffs_obj->ffs_ready_callback(ffs); | |
2949 | ||
2950 | done: | |
2951 | ffs_dev_unlock(); | |
2952 | return ret; | |
2953 | } | |
2954 | ||
2955 | static void ffs_closed(struct ffs_data *ffs) | |
2956 | { | |
2957 | struct ffs_dev *ffs_obj; | |
2958 | ||
2959 | ENTER(); | |
2960 | ffs_dev_lock(); | |
2961 | ||
2962 | ffs_obj = ffs->private_data; | |
2963 | if (!ffs_obj) | |
2964 | goto done; | |
2965 | ||
2966 | ffs_obj->desc_ready = false; | |
2967 | ||
2968 | if (ffs_obj->ffs_closed_callback) | |
2969 | ffs_obj->ffs_closed_callback(ffs); | |
b658499f AP |
2970 | |
2971 | if (!ffs_obj->opts || ffs_obj->opts->no_configfs | |
2972 | || !ffs_obj->opts->func_inst.group.cg_item.ci_parent) | |
2973 | goto done; | |
2974 | ||
2975 | unregister_gadget_item(ffs_obj->opts-> | |
2976 | func_inst.group.cg_item.ci_parent->ci_parent); | |
4b187fce AP |
2977 | done: |
2978 | ffs_dev_unlock(); | |
2979 | } | |
2980 | ||
ddf8abd2 MN |
2981 | /* Misc helper functions ****************************************************/ |
2982 | ||
2983 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
2984 | { | |
2985 | return nonblock | |
2986 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN | |
2987 | : mutex_lock_interruptible(mutex); | |
2988 | } | |
2989 | ||
260ef311 | 2990 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
2991 | { |
2992 | char *data; | |
2993 | ||
2994 | if (unlikely(!len)) | |
2995 | return NULL; | |
2996 | ||
2997 | data = kmalloc(len, GFP_KERNEL); | |
2998 | if (unlikely(!data)) | |
2999 | return ERR_PTR(-ENOMEM); | |
3000 | ||
3001 | if (unlikely(__copy_from_user(data, buf, len))) { | |
3002 | kfree(data); | |
3003 | return ERR_PTR(-EFAULT); | |
3004 | } | |
3005 | ||
aa02f172 | 3006 | pr_vdebug("Buffer from user space:\n"); |
ddf8abd2 MN |
3007 | ffs_dump_mem("", data, len); |
3008 | ||
3009 | return data; | |
3010 | } | |
5920cda6 | 3011 | |
5920cda6 AP |
3012 | DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc); |
3013 | MODULE_LICENSE("GPL"); | |
3014 | MODULE_AUTHOR("Michal Nazarewicz"); |