]>
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" |
f0175ab5 | 37 | #include "u_os_desc.h" |
b658499f | 38 | #include "configfs.h" |
ddf8abd2 MN |
39 | |
40 | #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ | |
41 | ||
ddf8abd2 MN |
42 | /* Reference counter handling */ |
43 | static void ffs_data_get(struct ffs_data *ffs); | |
44 | static void ffs_data_put(struct ffs_data *ffs); | |
45 | /* Creates new ffs_data object. */ | |
46 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); | |
47 | ||
48 | /* Opened counter handling. */ | |
49 | static void ffs_data_opened(struct ffs_data *ffs); | |
50 | static void ffs_data_closed(struct ffs_data *ffs); | |
51 | ||
5ab54cf7 | 52 | /* Called with ffs->mutex held; take over ownership of data. */ |
ddf8abd2 MN |
53 | static int __must_check |
54 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); | |
55 | static int __must_check | |
56 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); | |
57 | ||
58 | ||
59 | /* The function structure ***************************************************/ | |
60 | ||
61 | struct ffs_ep; | |
62 | ||
63 | struct ffs_function { | |
64 | struct usb_configuration *conf; | |
65 | struct usb_gadget *gadget; | |
66 | struct ffs_data *ffs; | |
67 | ||
68 | struct ffs_ep *eps; | |
69 | u8 eps_revmap[16]; | |
70 | short *interfaces_nums; | |
71 | ||
72 | struct usb_function function; | |
73 | }; | |
74 | ||
75 | ||
76 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) | |
77 | { | |
78 | return container_of(f, struct ffs_function, function); | |
79 | } | |
80 | ||
ddf8abd2 | 81 | |
a7ecf054 MN |
82 | static inline enum ffs_setup_state |
83 | ffs_setup_state_clear_cancelled(struct ffs_data *ffs) | |
84 | { | |
85 | return (enum ffs_setup_state) | |
86 | cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); | |
87 | } | |
88 | ||
89 | ||
ddf8abd2 MN |
90 | static void ffs_func_eps_disable(struct ffs_function *func); |
91 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); | |
92 | ||
ddf8abd2 MN |
93 | static int ffs_func_bind(struct usb_configuration *, |
94 | struct usb_function *); | |
ddf8abd2 MN |
95 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); |
96 | static void ffs_func_disable(struct usb_function *); | |
97 | static int ffs_func_setup(struct usb_function *, | |
98 | const struct usb_ctrlrequest *); | |
99 | static void ffs_func_suspend(struct usb_function *); | |
100 | static void ffs_func_resume(struct usb_function *); | |
101 | ||
102 | ||
103 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); | |
104 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); | |
105 | ||
106 | ||
ddf8abd2 MN |
107 | /* The endpoints structures *************************************************/ |
108 | ||
109 | struct ffs_ep { | |
110 | struct usb_ep *ep; /* P: ffs->eps_lock */ | |
111 | struct usb_request *req; /* P: epfile->mutex */ | |
112 | ||
8d4e897b MG |
113 | /* [0]: full speed, [1]: high speed, [2]: super speed */ |
114 | struct usb_endpoint_descriptor *descs[3]; | |
ddf8abd2 MN |
115 | |
116 | u8 num; | |
117 | ||
118 | int status; /* P: epfile->mutex */ | |
119 | }; | |
120 | ||
121 | struct ffs_epfile { | |
122 | /* Protects ep->ep and ep->req. */ | |
123 | struct mutex mutex; | |
124 | wait_queue_head_t wait; | |
125 | ||
126 | struct ffs_data *ffs; | |
127 | struct ffs_ep *ep; /* P: ffs->eps_lock */ | |
128 | ||
129 | struct dentry *dentry; | |
130 | ||
131 | char name[5]; | |
132 | ||
133 | unsigned char in; /* P: ffs->eps_lock */ | |
134 | unsigned char isoc; /* P: ffs->eps_lock */ | |
135 | ||
136 | unsigned char _pad; | |
137 | }; | |
138 | ||
2e4c7553 RB |
139 | /* ffs_io_data structure ***************************************************/ |
140 | ||
141 | struct ffs_io_data { | |
142 | bool aio; | |
143 | bool read; | |
144 | ||
145 | struct kiocb *kiocb; | |
146 | const struct iovec *iovec; | |
147 | unsigned long nr_segs; | |
148 | char __user *buf; | |
149 | size_t len; | |
150 | ||
151 | struct mm_struct *mm; | |
152 | struct work_struct work; | |
153 | ||
154 | struct usb_ep *ep; | |
155 | struct usb_request *req; | |
156 | }; | |
157 | ||
ddf8abd2 MN |
158 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
159 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); | |
160 | ||
161 | static struct inode *__must_check | |
162 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, | |
163 | const struct file_operations *fops, | |
164 | struct dentry **dentry_p); | |
165 | ||
4b187fce AP |
166 | /* Devices management *******************************************************/ |
167 | ||
168 | DEFINE_MUTEX(ffs_lock); | |
0700faaf | 169 | EXPORT_SYMBOL_GPL(ffs_lock); |
4b187fce | 170 | |
da13a773 AP |
171 | static struct ffs_dev *_ffs_find_dev(const char *name); |
172 | static struct ffs_dev *_ffs_alloc_dev(void); | |
b658499f | 173 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name); |
da13a773 | 174 | static void _ffs_free_dev(struct ffs_dev *dev); |
4b187fce AP |
175 | static void *ffs_acquire_dev(const char *dev_name); |
176 | static void ffs_release_dev(struct ffs_data *ffs_data); | |
177 | static int ffs_ready(struct ffs_data *ffs); | |
178 | static void ffs_closed(struct ffs_data *ffs); | |
ddf8abd2 MN |
179 | |
180 | /* Misc helper functions ****************************************************/ | |
181 | ||
182 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
183 | __attribute__((warn_unused_result, nonnull)); | |
260ef311 | 184 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
185 | __attribute__((warn_unused_result, nonnull)); |
186 | ||
187 | ||
188 | /* Control file aka ep0 *****************************************************/ | |
189 | ||
190 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
191 | { | |
192 | struct ffs_data *ffs = req->context; | |
193 | ||
194 | complete_all(&ffs->ep0req_completion); | |
195 | } | |
196 | ||
ddf8abd2 MN |
197 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
198 | { | |
199 | struct usb_request *req = ffs->ep0req; | |
200 | int ret; | |
201 | ||
202 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); | |
203 | ||
204 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
205 | ||
206 | req->buf = data; | |
207 | req->length = len; | |
208 | ||
ce1fd358 MS |
209 | /* |
210 | * UDC layer requires to provide a buffer even for ZLP, but should | |
211 | * not use it at all. Let's provide some poisoned pointer to catch | |
212 | * possible bug in the driver. | |
213 | */ | |
214 | if (req->buf == NULL) | |
215 | req->buf = (void *)0xDEADBABE; | |
216 | ||
16735d02 | 217 | reinit_completion(&ffs->ep0req_completion); |
ddf8abd2 MN |
218 | |
219 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); | |
220 | if (unlikely(ret < 0)) | |
221 | return ret; | |
222 | ||
223 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); | |
224 | if (unlikely(ret)) { | |
225 | usb_ep_dequeue(ffs->gadget->ep0, req); | |
226 | return -EINTR; | |
227 | } | |
228 | ||
229 | ffs->setup_state = FFS_NO_SETUP; | |
0a7b1f8a | 230 | return req->status ? req->status : req->actual; |
ddf8abd2 MN |
231 | } |
232 | ||
233 | static int __ffs_ep0_stall(struct ffs_data *ffs) | |
234 | { | |
235 | if (ffs->ev.can_stall) { | |
aa02f172 | 236 | pr_vdebug("ep0 stall\n"); |
ddf8abd2 MN |
237 | usb_ep_set_halt(ffs->gadget->ep0); |
238 | ffs->setup_state = FFS_NO_SETUP; | |
239 | return -EL2HLT; | |
240 | } else { | |
aa02f172 | 241 | pr_debug("bogus ep0 stall!\n"); |
ddf8abd2 MN |
242 | return -ESRCH; |
243 | } | |
244 | } | |
245 | ||
ddf8abd2 MN |
246 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
247 | size_t len, loff_t *ptr) | |
248 | { | |
249 | struct ffs_data *ffs = file->private_data; | |
250 | ssize_t ret; | |
251 | char *data; | |
252 | ||
253 | ENTER(); | |
254 | ||
255 | /* Fast check if setup was canceled */ | |
a7ecf054 | 256 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
257 | return -EIDRM; |
258 | ||
259 | /* Acquire mutex */ | |
260 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
261 | if (unlikely(ret < 0)) | |
262 | return ret; | |
263 | ||
ddf8abd2 MN |
264 | /* Check state */ |
265 | switch (ffs->state) { | |
266 | case FFS_READ_DESCRIPTORS: | |
267 | case FFS_READ_STRINGS: | |
268 | /* Copy data */ | |
269 | if (unlikely(len < 16)) { | |
270 | ret = -EINVAL; | |
271 | break; | |
272 | } | |
273 | ||
274 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 275 | if (IS_ERR(data)) { |
ddf8abd2 MN |
276 | ret = PTR_ERR(data); |
277 | break; | |
278 | } | |
279 | ||
280 | /* Handle data */ | |
281 | if (ffs->state == FFS_READ_DESCRIPTORS) { | |
aa02f172 | 282 | pr_info("read descriptors\n"); |
ddf8abd2 MN |
283 | ret = __ffs_data_got_descs(ffs, data, len); |
284 | if (unlikely(ret < 0)) | |
285 | break; | |
286 | ||
287 | ffs->state = FFS_READ_STRINGS; | |
288 | ret = len; | |
289 | } else { | |
aa02f172 | 290 | pr_info("read strings\n"); |
ddf8abd2 MN |
291 | ret = __ffs_data_got_strings(ffs, data, len); |
292 | if (unlikely(ret < 0)) | |
293 | break; | |
294 | ||
295 | ret = ffs_epfiles_create(ffs); | |
296 | if (unlikely(ret)) { | |
297 | ffs->state = FFS_CLOSING; | |
298 | break; | |
299 | } | |
300 | ||
301 | ffs->state = FFS_ACTIVE; | |
302 | mutex_unlock(&ffs->mutex); | |
303 | ||
4b187fce | 304 | ret = ffs_ready(ffs); |
ddf8abd2 MN |
305 | if (unlikely(ret < 0)) { |
306 | ffs->state = FFS_CLOSING; | |
307 | return ret; | |
308 | } | |
309 | ||
310 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); | |
311 | return len; | |
312 | } | |
313 | break; | |
314 | ||
ddf8abd2 MN |
315 | case FFS_ACTIVE: |
316 | data = NULL; | |
5ab54cf7 MN |
317 | /* |
318 | * We're called from user space, we can use _irq | |
319 | * rather then _irqsave | |
320 | */ | |
ddf8abd2 | 321 | spin_lock_irq(&ffs->ev.waitq.lock); |
a7ecf054 | 322 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 323 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
324 | ret = -EIDRM; |
325 | goto done_spin; | |
326 | ||
327 | case FFS_NO_SETUP: | |
328 | ret = -ESRCH; | |
329 | goto done_spin; | |
330 | ||
331 | case FFS_SETUP_PENDING: | |
332 | break; | |
333 | } | |
334 | ||
335 | /* FFS_SETUP_PENDING */ | |
336 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { | |
337 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
338 | ret = __ffs_ep0_stall(ffs); | |
339 | break; | |
340 | } | |
341 | ||
342 | /* FFS_SETUP_PENDING and not stall */ | |
343 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
344 | ||
345 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
346 | ||
347 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 348 | if (IS_ERR(data)) { |
ddf8abd2 MN |
349 | ret = PTR_ERR(data); |
350 | break; | |
351 | } | |
352 | ||
353 | spin_lock_irq(&ffs->ev.waitq.lock); | |
354 | ||
5ab54cf7 MN |
355 | /* |
356 | * We are guaranteed to be still in FFS_ACTIVE state | |
ddf8abd2 | 357 | * but the state of setup could have changed from |
e46318a0 | 358 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELLED so we need |
ddf8abd2 | 359 | * to check for that. If that happened we copied data |
5ab54cf7 MN |
360 | * from user space in vain but it's unlikely. |
361 | * | |
362 | * For sure we are not in FFS_NO_SETUP since this is | |
ddf8abd2 MN |
363 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
364 | * transition can be performed and it's protected by | |
5ab54cf7 MN |
365 | * mutex. |
366 | */ | |
a7ecf054 MN |
367 | if (ffs_setup_state_clear_cancelled(ffs) == |
368 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
369 | ret = -EIDRM; |
370 | done_spin: | |
371 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
372 | } else { | |
373 | /* unlocks spinlock */ | |
374 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
375 | } | |
376 | kfree(data); | |
377 | break; | |
378 | ||
ddf8abd2 MN |
379 | default: |
380 | ret = -EBADFD; | |
381 | break; | |
382 | } | |
383 | ||
ddf8abd2 MN |
384 | mutex_unlock(&ffs->mutex); |
385 | return ret; | |
386 | } | |
387 | ||
ddf8abd2 MN |
388 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, |
389 | size_t n) | |
390 | { | |
5ab54cf7 MN |
391 | /* |
392 | * We are holding ffs->ev.waitq.lock and ffs->mutex and we need | |
393 | * to release them. | |
394 | */ | |
ddf8abd2 MN |
395 | struct usb_functionfs_event events[n]; |
396 | unsigned i = 0; | |
397 | ||
398 | memset(events, 0, sizeof events); | |
399 | ||
400 | do { | |
401 | events[i].type = ffs->ev.types[i]; | |
402 | if (events[i].type == FUNCTIONFS_SETUP) { | |
403 | events[i].u.setup = ffs->ev.setup; | |
404 | ffs->setup_state = FFS_SETUP_PENDING; | |
405 | } | |
406 | } while (++i < n); | |
407 | ||
408 | if (n < ffs->ev.count) { | |
409 | ffs->ev.count -= n; | |
410 | memmove(ffs->ev.types, ffs->ev.types + n, | |
411 | ffs->ev.count * sizeof *ffs->ev.types); | |
412 | } else { | |
413 | ffs->ev.count = 0; | |
414 | } | |
415 | ||
416 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
417 | mutex_unlock(&ffs->mutex); | |
418 | ||
419 | return unlikely(__copy_to_user(buf, events, sizeof events)) | |
420 | ? -EFAULT : sizeof events; | |
421 | } | |
422 | ||
ddf8abd2 MN |
423 | static ssize_t ffs_ep0_read(struct file *file, char __user *buf, |
424 | size_t len, loff_t *ptr) | |
425 | { | |
426 | struct ffs_data *ffs = file->private_data; | |
427 | char *data = NULL; | |
428 | size_t n; | |
429 | int ret; | |
430 | ||
431 | ENTER(); | |
432 | ||
433 | /* Fast check if setup was canceled */ | |
a7ecf054 | 434 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
435 | return -EIDRM; |
436 | ||
437 | /* Acquire mutex */ | |
438 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
439 | if (unlikely(ret < 0)) | |
440 | return ret; | |
441 | ||
ddf8abd2 MN |
442 | /* Check state */ |
443 | if (ffs->state != FFS_ACTIVE) { | |
444 | ret = -EBADFD; | |
445 | goto done_mutex; | |
446 | } | |
447 | ||
5ab54cf7 MN |
448 | /* |
449 | * We're called from user space, we can use _irq rather then | |
450 | * _irqsave | |
451 | */ | |
ddf8abd2 MN |
452 | spin_lock_irq(&ffs->ev.waitq.lock); |
453 | ||
a7ecf054 | 454 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 455 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
456 | ret = -EIDRM; |
457 | break; | |
458 | ||
459 | case FFS_NO_SETUP: | |
460 | n = len / sizeof(struct usb_functionfs_event); | |
461 | if (unlikely(!n)) { | |
462 | ret = -EINVAL; | |
463 | break; | |
464 | } | |
465 | ||
466 | if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { | |
467 | ret = -EAGAIN; | |
468 | break; | |
469 | } | |
470 | ||
5ab54cf7 MN |
471 | if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, |
472 | ffs->ev.count)) { | |
ddf8abd2 MN |
473 | ret = -EINTR; |
474 | break; | |
475 | } | |
476 | ||
477 | return __ffs_ep0_read_events(ffs, buf, | |
478 | min(n, (size_t)ffs->ev.count)); | |
479 | ||
ddf8abd2 MN |
480 | case FFS_SETUP_PENDING: |
481 | if (ffs->ev.setup.bRequestType & USB_DIR_IN) { | |
482 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
483 | ret = __ffs_ep0_stall(ffs); | |
484 | goto done_mutex; | |
485 | } | |
486 | ||
487 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
488 | ||
489 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
490 | ||
491 | if (likely(len)) { | |
492 | data = kmalloc(len, GFP_KERNEL); | |
493 | if (unlikely(!data)) { | |
494 | ret = -ENOMEM; | |
495 | goto done_mutex; | |
496 | } | |
497 | } | |
498 | ||
499 | spin_lock_irq(&ffs->ev.waitq.lock); | |
500 | ||
501 | /* See ffs_ep0_write() */ | |
a7ecf054 MN |
502 | if (ffs_setup_state_clear_cancelled(ffs) == |
503 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
504 | ret = -EIDRM; |
505 | break; | |
506 | } | |
507 | ||
508 | /* unlocks spinlock */ | |
509 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
510 | if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len))) | |
511 | ret = -EFAULT; | |
512 | goto done_mutex; | |
513 | ||
514 | default: | |
515 | ret = -EBADFD; | |
516 | break; | |
517 | } | |
518 | ||
519 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
520 | done_mutex: | |
521 | mutex_unlock(&ffs->mutex); | |
522 | kfree(data); | |
523 | return ret; | |
524 | } | |
525 | ||
ddf8abd2 MN |
526 | static int ffs_ep0_open(struct inode *inode, struct file *file) |
527 | { | |
528 | struct ffs_data *ffs = inode->i_private; | |
529 | ||
530 | ENTER(); | |
531 | ||
532 | if (unlikely(ffs->state == FFS_CLOSING)) | |
533 | return -EBUSY; | |
534 | ||
535 | file->private_data = ffs; | |
536 | ffs_data_opened(ffs); | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
ddf8abd2 MN |
541 | static int ffs_ep0_release(struct inode *inode, struct file *file) |
542 | { | |
543 | struct ffs_data *ffs = file->private_data; | |
544 | ||
545 | ENTER(); | |
546 | ||
547 | ffs_data_closed(ffs); | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
ddf8abd2 MN |
552 | static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) |
553 | { | |
554 | struct ffs_data *ffs = file->private_data; | |
555 | struct usb_gadget *gadget = ffs->gadget; | |
556 | long ret; | |
557 | ||
558 | ENTER(); | |
559 | ||
560 | if (code == FUNCTIONFS_INTERFACE_REVMAP) { | |
561 | struct ffs_function *func = ffs->func; | |
562 | ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; | |
92b0abf8 | 563 | } else if (gadget && gadget->ops->ioctl) { |
ddf8abd2 | 564 | ret = gadget->ops->ioctl(gadget, code, value); |
ddf8abd2 MN |
565 | } else { |
566 | ret = -ENOTTY; | |
567 | } | |
568 | ||
569 | return ret; | |
570 | } | |
571 | ||
23de91e9 RB |
572 | static unsigned int ffs_ep0_poll(struct file *file, poll_table *wait) |
573 | { | |
574 | struct ffs_data *ffs = file->private_data; | |
575 | unsigned int mask = POLLWRNORM; | |
576 | int ret; | |
577 | ||
578 | poll_wait(file, &ffs->ev.waitq, wait); | |
579 | ||
580 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
581 | if (unlikely(ret < 0)) | |
582 | return mask; | |
583 | ||
584 | switch (ffs->state) { | |
585 | case FFS_READ_DESCRIPTORS: | |
586 | case FFS_READ_STRINGS: | |
587 | mask |= POLLOUT; | |
588 | break; | |
589 | ||
590 | case FFS_ACTIVE: | |
591 | switch (ffs->setup_state) { | |
592 | case FFS_NO_SETUP: | |
593 | if (ffs->ev.count) | |
594 | mask |= POLLIN; | |
595 | break; | |
596 | ||
597 | case FFS_SETUP_PENDING: | |
598 | case FFS_SETUP_CANCELLED: | |
599 | mask |= (POLLIN | POLLOUT); | |
600 | break; | |
601 | } | |
602 | case FFS_CLOSING: | |
603 | break; | |
604 | } | |
605 | ||
606 | mutex_unlock(&ffs->mutex); | |
607 | ||
608 | return mask; | |
609 | } | |
610 | ||
ddf8abd2 | 611 | static const struct file_operations ffs_ep0_operations = { |
ddf8abd2 MN |
612 | .llseek = no_llseek, |
613 | ||
614 | .open = ffs_ep0_open, | |
615 | .write = ffs_ep0_write, | |
616 | .read = ffs_ep0_read, | |
617 | .release = ffs_ep0_release, | |
618 | .unlocked_ioctl = ffs_ep0_ioctl, | |
23de91e9 | 619 | .poll = ffs_ep0_poll, |
ddf8abd2 MN |
620 | }; |
621 | ||
622 | ||
623 | /* "Normal" endpoints operations ********************************************/ | |
624 | ||
ddf8abd2 MN |
625 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) |
626 | { | |
627 | ENTER(); | |
628 | if (likely(req->context)) { | |
629 | struct ffs_ep *ep = _ep->driver_data; | |
630 | ep->status = req->status ? req->status : req->actual; | |
631 | complete(req->context); | |
632 | } | |
633 | } | |
634 | ||
2e4c7553 RB |
635 | static void ffs_user_copy_worker(struct work_struct *work) |
636 | { | |
637 | struct ffs_io_data *io_data = container_of(work, struct ffs_io_data, | |
638 | work); | |
639 | int ret = io_data->req->status ? io_data->req->status : | |
640 | io_data->req->actual; | |
641 | ||
642 | if (io_data->read && ret > 0) { | |
643 | int i; | |
644 | size_t pos = 0; | |
645 | use_mm(io_data->mm); | |
646 | for (i = 0; i < io_data->nr_segs; i++) { | |
647 | if (unlikely(copy_to_user(io_data->iovec[i].iov_base, | |
648 | &io_data->buf[pos], | |
649 | io_data->iovec[i].iov_len))) { | |
650 | ret = -EFAULT; | |
651 | break; | |
652 | } | |
653 | pos += io_data->iovec[i].iov_len; | |
654 | } | |
655 | unuse_mm(io_data->mm); | |
656 | } | |
657 | ||
658 | aio_complete(io_data->kiocb, ret, ret); | |
659 | ||
660 | usb_ep_free_request(io_data->ep, io_data->req); | |
661 | ||
662 | io_data->kiocb->private = NULL; | |
663 | if (io_data->read) | |
664 | kfree(io_data->iovec); | |
665 | kfree(io_data->buf); | |
666 | kfree(io_data); | |
667 | } | |
668 | ||
669 | static void ffs_epfile_async_io_complete(struct usb_ep *_ep, | |
670 | struct usb_request *req) | |
671 | { | |
672 | struct ffs_io_data *io_data = req->context; | |
673 | ||
674 | ENTER(); | |
675 | ||
676 | INIT_WORK(&io_data->work, ffs_user_copy_worker); | |
677 | schedule_work(&io_data->work); | |
678 | } | |
679 | ||
680 | static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data) | |
ddf8abd2 MN |
681 | { |
682 | struct ffs_epfile *epfile = file->private_data; | |
683 | struct ffs_ep *ep; | |
684 | char *data = NULL; | |
219580e6 | 685 | ssize_t ret, data_len; |
ddf8abd2 MN |
686 | int halt; |
687 | ||
7fa68034 MN |
688 | /* Are we still active? */ |
689 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) { | |
690 | ret = -ENODEV; | |
691 | goto error; | |
692 | } | |
ddf8abd2 | 693 | |
7fa68034 MN |
694 | /* Wait for endpoint to be enabled */ |
695 | ep = epfile->ep; | |
696 | if (!ep) { | |
697 | if (file->f_flags & O_NONBLOCK) { | |
698 | ret = -EAGAIN; | |
ddf8abd2 MN |
699 | goto error; |
700 | } | |
701 | ||
7fa68034 MN |
702 | ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep)); |
703 | if (ret) { | |
704 | ret = -EINTR; | |
ddf8abd2 MN |
705 | goto error; |
706 | } | |
7fa68034 | 707 | } |
ddf8abd2 | 708 | |
7fa68034 | 709 | /* Do we halt? */ |
2e4c7553 | 710 | halt = (!io_data->read == !epfile->in); |
7fa68034 MN |
711 | if (halt && epfile->isoc) { |
712 | ret = -EINVAL; | |
713 | goto error; | |
714 | } | |
ddf8abd2 | 715 | |
7fa68034 MN |
716 | /* Allocate & copy */ |
717 | if (!halt) { | |
f0f42204 AP |
718 | /* |
719 | * if we _do_ wait above, the epfile->ffs->gadget might be NULL | |
720 | * before the waiting completes, so do not assign to 'gadget' earlier | |
721 | */ | |
722 | struct usb_gadget *gadget = epfile->ffs->gadget; | |
723 | ||
97839ca4 CB |
724 | spin_lock_irq(&epfile->ffs->eps_lock); |
725 | /* In the meantime, endpoint got disabled or changed. */ | |
726 | if (epfile->ep != ep) { | |
727 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
728 | return -ESHUTDOWN; | |
729 | } | |
219580e6 MN |
730 | /* |
731 | * Controller may require buffer size to be aligned to | |
732 | * maxpacketsize of an out endpoint. | |
733 | */ | |
2e4c7553 RB |
734 | data_len = io_data->read ? |
735 | usb_ep_align_maybe(gadget, ep->ep, io_data->len) : | |
736 | io_data->len; | |
97839ca4 | 737 | spin_unlock_irq(&epfile->ffs->eps_lock); |
219580e6 MN |
738 | |
739 | data = kmalloc(data_len, GFP_KERNEL); | |
7fa68034 MN |
740 | if (unlikely(!data)) |
741 | return -ENOMEM; | |
2e4c7553 RB |
742 | if (io_data->aio && !io_data->read) { |
743 | int i; | |
744 | size_t pos = 0; | |
745 | for (i = 0; i < io_data->nr_segs; i++) { | |
746 | if (unlikely(copy_from_user(&data[pos], | |
747 | io_data->iovec[i].iov_base, | |
748 | io_data->iovec[i].iov_len))) { | |
749 | ret = -EFAULT; | |
750 | goto error; | |
751 | } | |
752 | pos += io_data->iovec[i].iov_len; | |
753 | } | |
754 | } else { | |
755 | if (!io_data->read && | |
756 | unlikely(__copy_from_user(data, io_data->buf, | |
757 | io_data->len))) { | |
758 | ret = -EFAULT; | |
759 | goto error; | |
760 | } | |
7fa68034 MN |
761 | } |
762 | } | |
ddf8abd2 | 763 | |
7fa68034 MN |
764 | /* We will be using request */ |
765 | ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); | |
766 | if (unlikely(ret)) | |
767 | goto error; | |
ddf8abd2 | 768 | |
7fa68034 | 769 | spin_lock_irq(&epfile->ffs->eps_lock); |
ddf8abd2 | 770 | |
7fa68034 MN |
771 | if (epfile->ep != ep) { |
772 | /* In the meantime, endpoint got disabled or changed. */ | |
773 | ret = -ESHUTDOWN; | |
774 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
775 | } else if (halt) { | |
776 | /* Halt */ | |
ddf8abd2 MN |
777 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) |
778 | usb_ep_set_halt(ep->ep); | |
779 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
780 | ret = -EBADMSG; | |
781 | } else { | |
782 | /* Fire the request */ | |
2e4c7553 | 783 | struct usb_request *req; |
ddf8abd2 | 784 | |
2e4c7553 RB |
785 | if (io_data->aio) { |
786 | req = usb_ep_alloc_request(ep->ep, GFP_KERNEL); | |
787 | if (unlikely(!req)) | |
48968f8d | 788 | goto error_lock; |
ddf8abd2 | 789 | |
2e4c7553 RB |
790 | req->buf = data; |
791 | req->length = io_data->len; | |
ddf8abd2 | 792 | |
2e4c7553 RB |
793 | io_data->buf = data; |
794 | io_data->ep = ep->ep; | |
795 | io_data->req = req; | |
ddf8abd2 | 796 | |
2e4c7553 RB |
797 | req->context = io_data; |
798 | req->complete = ffs_epfile_async_io_complete; | |
799 | ||
800 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); | |
801 | if (unlikely(ret)) { | |
802 | usb_ep_free_request(ep->ep, req); | |
48968f8d | 803 | goto error_lock; |
2e4c7553 RB |
804 | } |
805 | ret = -EIOCBQUEUED; | |
806 | ||
807 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
ddf8abd2 | 808 | } else { |
2e4c7553 RB |
809 | DECLARE_COMPLETION_ONSTACK(done); |
810 | ||
811 | req = ep->req; | |
812 | req->buf = data; | |
813 | req->length = io_data->len; | |
814 | ||
815 | req->context = &done; | |
816 | req->complete = ffs_epfile_io_complete; | |
817 | ||
818 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); | |
819 | ||
820 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
821 | ||
822 | if (unlikely(ret < 0)) { | |
823 | /* nop */ | |
824 | } else if (unlikely( | |
825 | wait_for_completion_interruptible(&done))) { | |
826 | ret = -EINTR; | |
827 | usb_ep_dequeue(ep->ep, req); | |
828 | } else { | |
cfe919b5 CL |
829 | /* |
830 | * XXX We may end up silently droping data | |
831 | * here. Since data_len (i.e. req->length) may | |
832 | * be bigger than len (after being rounded up | |
833 | * to maxpacketsize), we may end up with more | |
834 | * data then user space has space for. | |
835 | */ | |
836 | ret = ep->status; | |
837 | if (io_data->read && ret > 0) { | |
838 | ret = min_t(size_t, ret, io_data->len); | |
839 | ||
840 | if (unlikely(copy_to_user(io_data->buf, | |
841 | data, ret))) | |
842 | ret = -EFAULT; | |
843 | } | |
2e4c7553 RB |
844 | } |
845 | kfree(data); | |
ddf8abd2 MN |
846 | } |
847 | } | |
848 | ||
849 | mutex_unlock(&epfile->mutex); | |
2e4c7553 | 850 | return ret; |
48968f8d RB |
851 | |
852 | error_lock: | |
853 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
854 | mutex_unlock(&epfile->mutex); | |
ddf8abd2 MN |
855 | error: |
856 | kfree(data); | |
857 | return ret; | |
858 | } | |
859 | ||
ddf8abd2 MN |
860 | static ssize_t |
861 | ffs_epfile_write(struct file *file, const char __user *buf, size_t len, | |
862 | loff_t *ptr) | |
863 | { | |
2e4c7553 RB |
864 | struct ffs_io_data io_data; |
865 | ||
ddf8abd2 MN |
866 | ENTER(); |
867 | ||
2e4c7553 RB |
868 | io_data.aio = false; |
869 | io_data.read = false; | |
870 | io_data.buf = (char * __user)buf; | |
871 | io_data.len = len; | |
872 | ||
873 | return ffs_epfile_io(file, &io_data); | |
ddf8abd2 MN |
874 | } |
875 | ||
876 | static ssize_t | |
877 | ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr) | |
878 | { | |
2e4c7553 RB |
879 | struct ffs_io_data io_data; |
880 | ||
ddf8abd2 MN |
881 | ENTER(); |
882 | ||
2e4c7553 RB |
883 | io_data.aio = false; |
884 | io_data.read = true; | |
885 | io_data.buf = buf; | |
886 | io_data.len = len; | |
887 | ||
888 | return ffs_epfile_io(file, &io_data); | |
ddf8abd2 MN |
889 | } |
890 | ||
891 | static int | |
892 | ffs_epfile_open(struct inode *inode, struct file *file) | |
893 | { | |
894 | struct ffs_epfile *epfile = inode->i_private; | |
895 | ||
896 | ENTER(); | |
897 | ||
898 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
899 | return -ENODEV; | |
900 | ||
901 | file->private_data = epfile; | |
902 | ffs_data_opened(epfile->ffs); | |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
2e4c7553 RB |
907 | static int ffs_aio_cancel(struct kiocb *kiocb) |
908 | { | |
909 | struct ffs_io_data *io_data = kiocb->private; | |
910 | struct ffs_epfile *epfile = kiocb->ki_filp->private_data; | |
911 | int value; | |
912 | ||
913 | ENTER(); | |
914 | ||
915 | spin_lock_irq(&epfile->ffs->eps_lock); | |
916 | ||
917 | if (likely(io_data && io_data->ep && io_data->req)) | |
918 | value = usb_ep_dequeue(io_data->ep, io_data->req); | |
919 | else | |
920 | value = -EINVAL; | |
921 | ||
922 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
923 | ||
924 | return value; | |
925 | } | |
926 | ||
927 | static ssize_t ffs_epfile_aio_write(struct kiocb *kiocb, | |
928 | const struct iovec *iovec, | |
929 | unsigned long nr_segs, loff_t loff) | |
930 | { | |
931 | struct ffs_io_data *io_data; | |
932 | ||
933 | ENTER(); | |
934 | ||
935 | io_data = kmalloc(sizeof(*io_data), GFP_KERNEL); | |
936 | if (unlikely(!io_data)) | |
937 | return -ENOMEM; | |
938 | ||
939 | io_data->aio = true; | |
940 | io_data->read = false; | |
941 | io_data->kiocb = kiocb; | |
942 | io_data->iovec = iovec; | |
943 | io_data->nr_segs = nr_segs; | |
944 | io_data->len = kiocb->ki_nbytes; | |
945 | io_data->mm = current->mm; | |
946 | ||
947 | kiocb->private = io_data; | |
948 | ||
949 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
950 | ||
951 | return ffs_epfile_io(kiocb->ki_filp, io_data); | |
952 | } | |
953 | ||
954 | static ssize_t ffs_epfile_aio_read(struct kiocb *kiocb, | |
955 | const struct iovec *iovec, | |
956 | unsigned long nr_segs, loff_t loff) | |
957 | { | |
958 | struct ffs_io_data *io_data; | |
959 | struct iovec *iovec_copy; | |
960 | ||
961 | ENTER(); | |
962 | ||
963 | iovec_copy = kmalloc_array(nr_segs, sizeof(*iovec_copy), GFP_KERNEL); | |
964 | if (unlikely(!iovec_copy)) | |
965 | return -ENOMEM; | |
966 | ||
967 | memcpy(iovec_copy, iovec, sizeof(struct iovec)*nr_segs); | |
968 | ||
969 | io_data = kmalloc(sizeof(*io_data), GFP_KERNEL); | |
970 | if (unlikely(!io_data)) { | |
971 | kfree(iovec_copy); | |
972 | return -ENOMEM; | |
973 | } | |
974 | ||
975 | io_data->aio = true; | |
976 | io_data->read = true; | |
977 | io_data->kiocb = kiocb; | |
978 | io_data->iovec = iovec_copy; | |
979 | io_data->nr_segs = nr_segs; | |
980 | io_data->len = kiocb->ki_nbytes; | |
981 | io_data->mm = current->mm; | |
982 | ||
983 | kiocb->private = io_data; | |
984 | ||
985 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
986 | ||
987 | return ffs_epfile_io(kiocb->ki_filp, io_data); | |
988 | } | |
989 | ||
ddf8abd2 MN |
990 | static int |
991 | ffs_epfile_release(struct inode *inode, struct file *file) | |
992 | { | |
993 | struct ffs_epfile *epfile = inode->i_private; | |
994 | ||
995 | ENTER(); | |
996 | ||
997 | ffs_data_closed(epfile->ffs); | |
998 | ||
999 | return 0; | |
1000 | } | |
1001 | ||
ddf8abd2 MN |
1002 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
1003 | unsigned long value) | |
1004 | { | |
1005 | struct ffs_epfile *epfile = file->private_data; | |
1006 | int ret; | |
1007 | ||
1008 | ENTER(); | |
1009 | ||
1010 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
1011 | return -ENODEV; | |
1012 | ||
1013 | spin_lock_irq(&epfile->ffs->eps_lock); | |
1014 | if (likely(epfile->ep)) { | |
1015 | switch (code) { | |
1016 | case FUNCTIONFS_FIFO_STATUS: | |
1017 | ret = usb_ep_fifo_status(epfile->ep->ep); | |
1018 | break; | |
1019 | case FUNCTIONFS_FIFO_FLUSH: | |
1020 | usb_ep_fifo_flush(epfile->ep->ep); | |
1021 | ret = 0; | |
1022 | break; | |
1023 | case FUNCTIONFS_CLEAR_HALT: | |
1024 | ret = usb_ep_clear_halt(epfile->ep->ep); | |
1025 | break; | |
1026 | case FUNCTIONFS_ENDPOINT_REVMAP: | |
1027 | ret = epfile->ep->num; | |
1028 | break; | |
c559a353 RB |
1029 | case FUNCTIONFS_ENDPOINT_DESC: |
1030 | { | |
1031 | int desc_idx; | |
1032 | struct usb_endpoint_descriptor *desc; | |
1033 | ||
1034 | switch (epfile->ffs->gadget->speed) { | |
1035 | case USB_SPEED_SUPER: | |
1036 | desc_idx = 2; | |
1037 | break; | |
1038 | case USB_SPEED_HIGH: | |
1039 | desc_idx = 1; | |
1040 | break; | |
1041 | default: | |
1042 | desc_idx = 0; | |
1043 | } | |
1044 | desc = epfile->ep->descs[desc_idx]; | |
1045 | ||
1046 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1047 | ret = copy_to_user((void *)value, desc, sizeof(*desc)); | |
1048 | if (ret) | |
1049 | ret = -EFAULT; | |
1050 | return ret; | |
1051 | } | |
ddf8abd2 MN |
1052 | default: |
1053 | ret = -ENOTTY; | |
1054 | } | |
1055 | } else { | |
1056 | ret = -ENODEV; | |
1057 | } | |
1058 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1059 | ||
1060 | return ret; | |
1061 | } | |
1062 | ||
ddf8abd2 | 1063 | static const struct file_operations ffs_epfile_operations = { |
ddf8abd2 MN |
1064 | .llseek = no_llseek, |
1065 | ||
1066 | .open = ffs_epfile_open, | |
1067 | .write = ffs_epfile_write, | |
1068 | .read = ffs_epfile_read, | |
2e4c7553 RB |
1069 | .aio_write = ffs_epfile_aio_write, |
1070 | .aio_read = ffs_epfile_aio_read, | |
ddf8abd2 MN |
1071 | .release = ffs_epfile_release, |
1072 | .unlocked_ioctl = ffs_epfile_ioctl, | |
1073 | }; | |
1074 | ||
1075 | ||
ddf8abd2 MN |
1076 | /* File system and super block operations ***********************************/ |
1077 | ||
1078 | /* | |
5ab54cf7 | 1079 | * Mounting the file system creates a controller file, used first for |
ddf8abd2 MN |
1080 | * function configuration then later for event monitoring. |
1081 | */ | |
1082 | ||
ddf8abd2 MN |
1083 | static struct inode *__must_check |
1084 | ffs_sb_make_inode(struct super_block *sb, void *data, | |
1085 | const struct file_operations *fops, | |
1086 | const struct inode_operations *iops, | |
1087 | struct ffs_file_perms *perms) | |
1088 | { | |
1089 | struct inode *inode; | |
1090 | ||
1091 | ENTER(); | |
1092 | ||
1093 | inode = new_inode(sb); | |
1094 | ||
1095 | if (likely(inode)) { | |
1096 | struct timespec current_time = CURRENT_TIME; | |
1097 | ||
12ba8d1e | 1098 | inode->i_ino = get_next_ino(); |
ddf8abd2 MN |
1099 | inode->i_mode = perms->mode; |
1100 | inode->i_uid = perms->uid; | |
1101 | inode->i_gid = perms->gid; | |
1102 | inode->i_atime = current_time; | |
1103 | inode->i_mtime = current_time; | |
1104 | inode->i_ctime = current_time; | |
1105 | inode->i_private = data; | |
1106 | if (fops) | |
1107 | inode->i_fop = fops; | |
1108 | if (iops) | |
1109 | inode->i_op = iops; | |
1110 | } | |
1111 | ||
1112 | return inode; | |
1113 | } | |
1114 | ||
ddf8abd2 | 1115 | /* Create "regular" file */ |
ddf8abd2 MN |
1116 | static struct inode *ffs_sb_create_file(struct super_block *sb, |
1117 | const char *name, void *data, | |
1118 | const struct file_operations *fops, | |
1119 | struct dentry **dentry_p) | |
1120 | { | |
1121 | struct ffs_data *ffs = sb->s_fs_info; | |
1122 | struct dentry *dentry; | |
1123 | struct inode *inode; | |
1124 | ||
1125 | ENTER(); | |
1126 | ||
1127 | dentry = d_alloc_name(sb->s_root, name); | |
1128 | if (unlikely(!dentry)) | |
1129 | return NULL; | |
1130 | ||
1131 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); | |
1132 | if (unlikely(!inode)) { | |
1133 | dput(dentry); | |
1134 | return NULL; | |
1135 | } | |
1136 | ||
1137 | d_add(dentry, inode); | |
1138 | if (dentry_p) | |
1139 | *dentry_p = dentry; | |
1140 | ||
1141 | return inode; | |
1142 | } | |
1143 | ||
ddf8abd2 | 1144 | /* Super block */ |
ddf8abd2 MN |
1145 | static const struct super_operations ffs_sb_operations = { |
1146 | .statfs = simple_statfs, | |
1147 | .drop_inode = generic_delete_inode, | |
1148 | }; | |
1149 | ||
1150 | struct ffs_sb_fill_data { | |
1151 | struct ffs_file_perms perms; | |
1152 | umode_t root_mode; | |
1153 | const char *dev_name; | |
2606b28a | 1154 | struct ffs_data *ffs_data; |
ddf8abd2 MN |
1155 | }; |
1156 | ||
1157 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) | |
1158 | { | |
1159 | struct ffs_sb_fill_data *data = _data; | |
1160 | struct inode *inode; | |
2606b28a | 1161 | struct ffs_data *ffs = data->ffs_data; |
ddf8abd2 MN |
1162 | |
1163 | ENTER(); | |
1164 | ||
ddf8abd2 | 1165 | ffs->sb = sb; |
2606b28a | 1166 | data->ffs_data = NULL; |
ddf8abd2 MN |
1167 | sb->s_fs_info = ffs; |
1168 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1169 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1170 | sb->s_magic = FUNCTIONFS_MAGIC; | |
1171 | sb->s_op = &ffs_sb_operations; | |
1172 | sb->s_time_gran = 1; | |
1173 | ||
1174 | /* Root inode */ | |
1175 | data->perms.mode = data->root_mode; | |
1176 | inode = ffs_sb_make_inode(sb, NULL, | |
1177 | &simple_dir_operations, | |
1178 | &simple_dir_inode_operations, | |
1179 | &data->perms); | |
48fde701 AV |
1180 | sb->s_root = d_make_root(inode); |
1181 | if (unlikely(!sb->s_root)) | |
2606b28a | 1182 | return -ENOMEM; |
ddf8abd2 MN |
1183 | |
1184 | /* EP0 file */ | |
1185 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, | |
1186 | &ffs_ep0_operations, NULL))) | |
2606b28a | 1187 | return -ENOMEM; |
ddf8abd2 MN |
1188 | |
1189 | return 0; | |
ddf8abd2 MN |
1190 | } |
1191 | ||
ddf8abd2 MN |
1192 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
1193 | { | |
1194 | ENTER(); | |
1195 | ||
1196 | if (!opts || !*opts) | |
1197 | return 0; | |
1198 | ||
1199 | for (;;) { | |
ddf8abd2 | 1200 | unsigned long value; |
afd2e186 | 1201 | char *eq, *comma; |
ddf8abd2 MN |
1202 | |
1203 | /* Option limit */ | |
1204 | comma = strchr(opts, ','); | |
1205 | if (comma) | |
1206 | *comma = 0; | |
1207 | ||
1208 | /* Value limit */ | |
1209 | eq = strchr(opts, '='); | |
1210 | if (unlikely(!eq)) { | |
aa02f172 | 1211 | pr_err("'=' missing in %s\n", opts); |
ddf8abd2 MN |
1212 | return -EINVAL; |
1213 | } | |
1214 | *eq = 0; | |
1215 | ||
1216 | /* Parse value */ | |
afd2e186 | 1217 | if (kstrtoul(eq + 1, 0, &value)) { |
aa02f172 | 1218 | pr_err("%s: invalid value: %s\n", opts, eq + 1); |
ddf8abd2 MN |
1219 | return -EINVAL; |
1220 | } | |
1221 | ||
1222 | /* Interpret option */ | |
1223 | switch (eq - opts) { | |
1224 | case 5: | |
1225 | if (!memcmp(opts, "rmode", 5)) | |
1226 | data->root_mode = (value & 0555) | S_IFDIR; | |
1227 | else if (!memcmp(opts, "fmode", 5)) | |
1228 | data->perms.mode = (value & 0666) | S_IFREG; | |
1229 | else | |
1230 | goto invalid; | |
1231 | break; | |
1232 | ||
1233 | case 4: | |
1234 | if (!memcmp(opts, "mode", 4)) { | |
1235 | data->root_mode = (value & 0555) | S_IFDIR; | |
1236 | data->perms.mode = (value & 0666) | S_IFREG; | |
1237 | } else { | |
1238 | goto invalid; | |
1239 | } | |
1240 | break; | |
1241 | ||
1242 | case 3: | |
b9b73f7c EB |
1243 | if (!memcmp(opts, "uid", 3)) { |
1244 | data->perms.uid = make_kuid(current_user_ns(), value); | |
1245 | if (!uid_valid(data->perms.uid)) { | |
1246 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1247 | return -EINVAL; | |
1248 | } | |
b8100750 | 1249 | } else if (!memcmp(opts, "gid", 3)) { |
b9b73f7c EB |
1250 | data->perms.gid = make_kgid(current_user_ns(), value); |
1251 | if (!gid_valid(data->perms.gid)) { | |
1252 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1253 | return -EINVAL; | |
1254 | } | |
b8100750 | 1255 | } else { |
ddf8abd2 | 1256 | goto invalid; |
b8100750 | 1257 | } |
ddf8abd2 MN |
1258 | break; |
1259 | ||
1260 | default: | |
1261 | invalid: | |
aa02f172 | 1262 | pr_err("%s: invalid option\n", opts); |
ddf8abd2 MN |
1263 | return -EINVAL; |
1264 | } | |
1265 | ||
1266 | /* Next iteration */ | |
1267 | if (!comma) | |
1268 | break; | |
1269 | opts = comma + 1; | |
1270 | } | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
ddf8abd2 MN |
1275 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
1276 | ||
fc14f2fe AV |
1277 | static struct dentry * |
1278 | ffs_fs_mount(struct file_system_type *t, int flags, | |
1279 | const char *dev_name, void *opts) | |
ddf8abd2 MN |
1280 | { |
1281 | struct ffs_sb_fill_data data = { | |
1282 | .perms = { | |
1283 | .mode = S_IFREG | 0600, | |
b9b73f7c EB |
1284 | .uid = GLOBAL_ROOT_UID, |
1285 | .gid = GLOBAL_ROOT_GID, | |
ddf8abd2 MN |
1286 | }, |
1287 | .root_mode = S_IFDIR | 0500, | |
1288 | }; | |
581791f5 | 1289 | struct dentry *rv; |
ddf8abd2 | 1290 | int ret; |
581791f5 | 1291 | void *ffs_dev; |
2606b28a | 1292 | struct ffs_data *ffs; |
ddf8abd2 MN |
1293 | |
1294 | ENTER(); | |
1295 | ||
ddf8abd2 MN |
1296 | ret = ffs_fs_parse_opts(&data, opts); |
1297 | if (unlikely(ret < 0)) | |
fc14f2fe | 1298 | return ERR_PTR(ret); |
ddf8abd2 | 1299 | |
2606b28a AV |
1300 | ffs = ffs_data_new(); |
1301 | if (unlikely(!ffs)) | |
1302 | return ERR_PTR(-ENOMEM); | |
1303 | ffs->file_perms = data.perms; | |
1304 | ||
1305 | ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); | |
1306 | if (unlikely(!ffs->dev_name)) { | |
1307 | ffs_data_put(ffs); | |
1308 | return ERR_PTR(-ENOMEM); | |
1309 | } | |
1310 | ||
4b187fce | 1311 | ffs_dev = ffs_acquire_dev(dev_name); |
2606b28a AV |
1312 | if (IS_ERR(ffs_dev)) { |
1313 | ffs_data_put(ffs); | |
1314 | return ERR_CAST(ffs_dev); | |
1315 | } | |
1316 | ffs->private_data = ffs_dev; | |
1317 | data.ffs_data = ffs; | |
581791f5 | 1318 | |
581791f5 | 1319 | rv = mount_nodev(t, flags, &data, ffs_sb_fill); |
2606b28a | 1320 | if (IS_ERR(rv) && data.ffs_data) { |
4b187fce | 1321 | ffs_release_dev(data.ffs_data); |
2606b28a AV |
1322 | ffs_data_put(data.ffs_data); |
1323 | } | |
581791f5 | 1324 | return rv; |
ddf8abd2 MN |
1325 | } |
1326 | ||
1327 | static void | |
1328 | ffs_fs_kill_sb(struct super_block *sb) | |
1329 | { | |
ddf8abd2 MN |
1330 | ENTER(); |
1331 | ||
1332 | kill_litter_super(sb); | |
581791f5 | 1333 | if (sb->s_fs_info) { |
4b187fce | 1334 | ffs_release_dev(sb->s_fs_info); |
5b5f9560 | 1335 | ffs_data_put(sb->s_fs_info); |
581791f5 | 1336 | } |
ddf8abd2 MN |
1337 | } |
1338 | ||
1339 | static struct file_system_type ffs_fs_type = { | |
1340 | .owner = THIS_MODULE, | |
1341 | .name = "functionfs", | |
fc14f2fe | 1342 | .mount = ffs_fs_mount, |
ddf8abd2 MN |
1343 | .kill_sb = ffs_fs_kill_sb, |
1344 | }; | |
7f78e035 | 1345 | MODULE_ALIAS_FS("functionfs"); |
ddf8abd2 MN |
1346 | |
1347 | ||
ddf8abd2 MN |
1348 | /* Driver's main init/cleanup functions *************************************/ |
1349 | ||
ddf8abd2 MN |
1350 | static int functionfs_init(void) |
1351 | { | |
1352 | int ret; | |
1353 | ||
1354 | ENTER(); | |
1355 | ||
1356 | ret = register_filesystem(&ffs_fs_type); | |
1357 | if (likely(!ret)) | |
aa02f172 | 1358 | pr_info("file system registered\n"); |
ddf8abd2 | 1359 | else |
aa02f172 | 1360 | pr_err("failed registering file system (%d)\n", ret); |
ddf8abd2 MN |
1361 | |
1362 | return ret; | |
1363 | } | |
1364 | ||
1365 | static void functionfs_cleanup(void) | |
1366 | { | |
1367 | ENTER(); | |
1368 | ||
aa02f172 | 1369 | pr_info("unloading\n"); |
ddf8abd2 MN |
1370 | unregister_filesystem(&ffs_fs_type); |
1371 | } | |
1372 | ||
1373 | ||
ddf8abd2 MN |
1374 | /* ffs_data and ffs_function construction and destruction code **************/ |
1375 | ||
1376 | static void ffs_data_clear(struct ffs_data *ffs); | |
1377 | static void ffs_data_reset(struct ffs_data *ffs); | |
1378 | ||
ddf8abd2 MN |
1379 | static void ffs_data_get(struct ffs_data *ffs) |
1380 | { | |
1381 | ENTER(); | |
1382 | ||
1383 | atomic_inc(&ffs->ref); | |
1384 | } | |
1385 | ||
1386 | static void ffs_data_opened(struct ffs_data *ffs) | |
1387 | { | |
1388 | ENTER(); | |
1389 | ||
1390 | atomic_inc(&ffs->ref); | |
1391 | atomic_inc(&ffs->opened); | |
1392 | } | |
1393 | ||
1394 | static void ffs_data_put(struct ffs_data *ffs) | |
1395 | { | |
1396 | ENTER(); | |
1397 | ||
1398 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { | |
aa02f172 | 1399 | pr_info("%s(): freeing\n", __func__); |
ddf8abd2 | 1400 | ffs_data_clear(ffs); |
647d5580 | 1401 | BUG_ON(waitqueue_active(&ffs->ev.waitq) || |
ddf8abd2 | 1402 | waitqueue_active(&ffs->ep0req_completion.wait)); |
581791f5 | 1403 | kfree(ffs->dev_name); |
ddf8abd2 MN |
1404 | kfree(ffs); |
1405 | } | |
1406 | } | |
1407 | ||
ddf8abd2 MN |
1408 | static void ffs_data_closed(struct ffs_data *ffs) |
1409 | { | |
1410 | ENTER(); | |
1411 | ||
1412 | if (atomic_dec_and_test(&ffs->opened)) { | |
1413 | ffs->state = FFS_CLOSING; | |
1414 | ffs_data_reset(ffs); | |
1415 | } | |
1416 | ||
1417 | ffs_data_put(ffs); | |
1418 | } | |
1419 | ||
ddf8abd2 MN |
1420 | static struct ffs_data *ffs_data_new(void) |
1421 | { | |
1422 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); | |
1423 | if (unlikely(!ffs)) | |
f8800d47 | 1424 | return NULL; |
ddf8abd2 MN |
1425 | |
1426 | ENTER(); | |
1427 | ||
1428 | atomic_set(&ffs->ref, 1); | |
1429 | atomic_set(&ffs->opened, 0); | |
1430 | ffs->state = FFS_READ_DESCRIPTORS; | |
1431 | mutex_init(&ffs->mutex); | |
1432 | spin_lock_init(&ffs->eps_lock); | |
1433 | init_waitqueue_head(&ffs->ev.waitq); | |
1434 | init_completion(&ffs->ep0req_completion); | |
1435 | ||
1436 | /* XXX REVISIT need to update it in some places, or do we? */ | |
1437 | ffs->ev.can_stall = 1; | |
1438 | ||
1439 | return ffs; | |
1440 | } | |
1441 | ||
ddf8abd2 MN |
1442 | static void ffs_data_clear(struct ffs_data *ffs) |
1443 | { | |
1444 | ENTER(); | |
1445 | ||
1446 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags)) | |
4b187fce | 1447 | ffs_closed(ffs); |
ddf8abd2 MN |
1448 | |
1449 | BUG_ON(ffs->gadget); | |
1450 | ||
1451 | if (ffs->epfiles) | |
1452 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); | |
1453 | ||
ac8dde11 | 1454 | kfree(ffs->raw_descs_data); |
ddf8abd2 MN |
1455 | kfree(ffs->raw_strings); |
1456 | kfree(ffs->stringtabs); | |
1457 | } | |
1458 | ||
ddf8abd2 MN |
1459 | static void ffs_data_reset(struct ffs_data *ffs) |
1460 | { | |
1461 | ENTER(); | |
1462 | ||
1463 | ffs_data_clear(ffs); | |
1464 | ||
1465 | ffs->epfiles = NULL; | |
ac8dde11 | 1466 | ffs->raw_descs_data = NULL; |
ddf8abd2 MN |
1467 | ffs->raw_descs = NULL; |
1468 | ffs->raw_strings = NULL; | |
1469 | ffs->stringtabs = NULL; | |
1470 | ||
1471 | ffs->raw_descs_length = 0; | |
ddf8abd2 MN |
1472 | ffs->fs_descs_count = 0; |
1473 | ffs->hs_descs_count = 0; | |
8d4e897b | 1474 | ffs->ss_descs_count = 0; |
ddf8abd2 MN |
1475 | |
1476 | ffs->strings_count = 0; | |
1477 | ffs->interfaces_count = 0; | |
1478 | ffs->eps_count = 0; | |
1479 | ||
1480 | ffs->ev.count = 0; | |
1481 | ||
1482 | ffs->state = FFS_READ_DESCRIPTORS; | |
1483 | ffs->setup_state = FFS_NO_SETUP; | |
1484 | ffs->flags = 0; | |
1485 | } | |
1486 | ||
1487 | ||
1488 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) | |
1489 | { | |
fd7c9a00 MN |
1490 | struct usb_gadget_strings **lang; |
1491 | int first_id; | |
ddf8abd2 MN |
1492 | |
1493 | ENTER(); | |
1494 | ||
1495 | if (WARN_ON(ffs->state != FFS_ACTIVE | |
1496 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) | |
1497 | return -EBADFD; | |
1498 | ||
fd7c9a00 MN |
1499 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
1500 | if (unlikely(first_id < 0)) | |
1501 | return first_id; | |
ddf8abd2 MN |
1502 | |
1503 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); | |
1504 | if (unlikely(!ffs->ep0req)) | |
1505 | return -ENOMEM; | |
1506 | ffs->ep0req->complete = ffs_ep0_complete; | |
1507 | ffs->ep0req->context = ffs; | |
1508 | ||
fd7c9a00 | 1509 | lang = ffs->stringtabs; |
f0688c8b MN |
1510 | if (lang) { |
1511 | for (; *lang; ++lang) { | |
1512 | struct usb_string *str = (*lang)->strings; | |
1513 | int id = first_id; | |
1514 | for (; str->s; ++id, ++str) | |
1515 | str->id = id; | |
1516 | } | |
ddf8abd2 MN |
1517 | } |
1518 | ||
1519 | ffs->gadget = cdev->gadget; | |
fd7c9a00 | 1520 | ffs_data_get(ffs); |
ddf8abd2 MN |
1521 | return 0; |
1522 | } | |
1523 | ||
ddf8abd2 MN |
1524 | static void functionfs_unbind(struct ffs_data *ffs) |
1525 | { | |
1526 | ENTER(); | |
1527 | ||
1528 | if (!WARN_ON(!ffs->gadget)) { | |
1529 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); | |
1530 | ffs->ep0req = NULL; | |
1531 | ffs->gadget = NULL; | |
e2190a97 | 1532 | clear_bit(FFS_FL_BOUND, &ffs->flags); |
df498995 | 1533 | ffs_data_put(ffs); |
ddf8abd2 MN |
1534 | } |
1535 | } | |
1536 | ||
ddf8abd2 MN |
1537 | static int ffs_epfiles_create(struct ffs_data *ffs) |
1538 | { | |
1539 | struct ffs_epfile *epfile, *epfiles; | |
1540 | unsigned i, count; | |
1541 | ||
1542 | ENTER(); | |
1543 | ||
1544 | count = ffs->eps_count; | |
9823a525 | 1545 | epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL); |
ddf8abd2 MN |
1546 | if (!epfiles) |
1547 | return -ENOMEM; | |
1548 | ||
1549 | epfile = epfiles; | |
1550 | for (i = 1; i <= count; ++i, ++epfile) { | |
1551 | epfile->ffs = ffs; | |
1552 | mutex_init(&epfile->mutex); | |
1553 | init_waitqueue_head(&epfile->wait); | |
1554 | sprintf(epfiles->name, "ep%u", i); | |
1555 | if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile, | |
1556 | &ffs_epfile_operations, | |
1557 | &epfile->dentry))) { | |
1558 | ffs_epfiles_destroy(epfiles, i - 1); | |
1559 | return -ENOMEM; | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | ffs->epfiles = epfiles; | |
1564 | return 0; | |
1565 | } | |
1566 | ||
ddf8abd2 MN |
1567 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
1568 | { | |
1569 | struct ffs_epfile *epfile = epfiles; | |
1570 | ||
1571 | ENTER(); | |
1572 | ||
1573 | for (; count; --count, ++epfile) { | |
1574 | BUG_ON(mutex_is_locked(&epfile->mutex) || | |
1575 | waitqueue_active(&epfile->wait)); | |
1576 | if (epfile->dentry) { | |
1577 | d_delete(epfile->dentry); | |
1578 | dput(epfile->dentry); | |
1579 | epfile->dentry = NULL; | |
1580 | } | |
1581 | } | |
1582 | ||
1583 | kfree(epfiles); | |
1584 | } | |
1585 | ||
5920cda6 | 1586 | |
ddf8abd2 MN |
1587 | static void ffs_func_eps_disable(struct ffs_function *func) |
1588 | { | |
1589 | struct ffs_ep *ep = func->eps; | |
1590 | struct ffs_epfile *epfile = func->ffs->epfiles; | |
1591 | unsigned count = func->ffs->eps_count; | |
1592 | unsigned long flags; | |
1593 | ||
1594 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1595 | do { | |
1596 | /* pending requests get nuked */ | |
1597 | if (likely(ep->ep)) | |
1598 | usb_ep_disable(ep->ep); | |
1599 | epfile->ep = NULL; | |
1600 | ||
1601 | ++ep; | |
1602 | ++epfile; | |
1603 | } while (--count); | |
1604 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1605 | } | |
1606 | ||
1607 | static int ffs_func_eps_enable(struct ffs_function *func) | |
1608 | { | |
1609 | struct ffs_data *ffs = func->ffs; | |
1610 | struct ffs_ep *ep = func->eps; | |
1611 | struct ffs_epfile *epfile = ffs->epfiles; | |
1612 | unsigned count = ffs->eps_count; | |
1613 | unsigned long flags; | |
1614 | int ret = 0; | |
1615 | ||
1616 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1617 | do { | |
1618 | struct usb_endpoint_descriptor *ds; | |
8d4e897b MG |
1619 | int desc_idx; |
1620 | ||
1621 | if (ffs->gadget->speed == USB_SPEED_SUPER) | |
1622 | desc_idx = 2; | |
1623 | else if (ffs->gadget->speed == USB_SPEED_HIGH) | |
1624 | desc_idx = 1; | |
1625 | else | |
1626 | desc_idx = 0; | |
1627 | ||
1628 | /* fall-back to lower speed if desc missing for current speed */ | |
1629 | do { | |
1630 | ds = ep->descs[desc_idx]; | |
1631 | } while (!ds && --desc_idx >= 0); | |
1632 | ||
1633 | if (!ds) { | |
1634 | ret = -EINVAL; | |
1635 | break; | |
1636 | } | |
ddf8abd2 MN |
1637 | |
1638 | ep->ep->driver_data = ep; | |
72c973dd TB |
1639 | ep->ep->desc = ds; |
1640 | ret = usb_ep_enable(ep->ep); | |
ddf8abd2 MN |
1641 | if (likely(!ret)) { |
1642 | epfile->ep = ep; | |
1643 | epfile->in = usb_endpoint_dir_in(ds); | |
1644 | epfile->isoc = usb_endpoint_xfer_isoc(ds); | |
1645 | } else { | |
1646 | break; | |
1647 | } | |
1648 | ||
1649 | wake_up(&epfile->wait); | |
1650 | ||
1651 | ++ep; | |
1652 | ++epfile; | |
1653 | } while (--count); | |
1654 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1655 | ||
1656 | return ret; | |
1657 | } | |
1658 | ||
1659 | ||
1660 | /* Parsing and building descriptors and strings *****************************/ | |
1661 | ||
5ab54cf7 MN |
1662 | /* |
1663 | * This validates if data pointed by data is a valid USB descriptor as | |
ddf8abd2 | 1664 | * well as record how many interfaces, endpoints and strings are |
5ab54cf7 MN |
1665 | * required by given configuration. Returns address after the |
1666 | * descriptor or NULL if data is invalid. | |
1667 | */ | |
ddf8abd2 MN |
1668 | |
1669 | enum ffs_entity_type { | |
1670 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT | |
1671 | }; | |
1672 | ||
f0175ab5 AP |
1673 | enum ffs_os_desc_type { |
1674 | FFS_OS_DESC, FFS_OS_DESC_EXT_COMPAT, FFS_OS_DESC_EXT_PROP | |
1675 | }; | |
1676 | ||
ddf8abd2 MN |
1677 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, |
1678 | u8 *valuep, | |
1679 | struct usb_descriptor_header *desc, | |
1680 | void *priv); | |
1681 | ||
f0175ab5 AP |
1682 | typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, |
1683 | struct usb_os_desc_header *h, void *data, | |
1684 | unsigned len, void *priv); | |
1685 | ||
f96cbd14 AP |
1686 | static int __must_check ffs_do_single_desc(char *data, unsigned len, |
1687 | ffs_entity_callback entity, | |
1688 | void *priv) | |
ddf8abd2 MN |
1689 | { |
1690 | struct usb_descriptor_header *_ds = (void *)data; | |
1691 | u8 length; | |
1692 | int ret; | |
1693 | ||
1694 | ENTER(); | |
1695 | ||
1696 | /* At least two bytes are required: length and type */ | |
1697 | if (len < 2) { | |
aa02f172 | 1698 | pr_vdebug("descriptor too short\n"); |
ddf8abd2 MN |
1699 | return -EINVAL; |
1700 | } | |
1701 | ||
1702 | /* If we have at least as many bytes as the descriptor takes? */ | |
1703 | length = _ds->bLength; | |
1704 | if (len < length) { | |
aa02f172 | 1705 | pr_vdebug("descriptor longer then available data\n"); |
ddf8abd2 MN |
1706 | return -EINVAL; |
1707 | } | |
1708 | ||
1709 | #define __entity_check_INTERFACE(val) 1 | |
1710 | #define __entity_check_STRING(val) (val) | |
1711 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) | |
1712 | #define __entity(type, val) do { \ | |
aa02f172 | 1713 | pr_vdebug("entity " #type "(%02x)\n", (val)); \ |
ddf8abd2 | 1714 | if (unlikely(!__entity_check_ ##type(val))) { \ |
aa02f172 | 1715 | pr_vdebug("invalid entity's value\n"); \ |
ddf8abd2 MN |
1716 | return -EINVAL; \ |
1717 | } \ | |
1718 | ret = entity(FFS_ ##type, &val, _ds, priv); \ | |
1719 | if (unlikely(ret < 0)) { \ | |
aa02f172 | 1720 | pr_debug("entity " #type "(%02x); ret = %d\n", \ |
d8df0b61 | 1721 | (val), ret); \ |
ddf8abd2 MN |
1722 | return ret; \ |
1723 | } \ | |
1724 | } while (0) | |
1725 | ||
1726 | /* Parse descriptor depending on type. */ | |
1727 | switch (_ds->bDescriptorType) { | |
1728 | case USB_DT_DEVICE: | |
1729 | case USB_DT_CONFIG: | |
1730 | case USB_DT_STRING: | |
1731 | case USB_DT_DEVICE_QUALIFIER: | |
1732 | /* function can't have any of those */ | |
aa02f172 | 1733 | pr_vdebug("descriptor reserved for gadget: %d\n", |
5ab54cf7 | 1734 | _ds->bDescriptorType); |
ddf8abd2 MN |
1735 | return -EINVAL; |
1736 | ||
1737 | case USB_DT_INTERFACE: { | |
1738 | struct usb_interface_descriptor *ds = (void *)_ds; | |
aa02f172 | 1739 | pr_vdebug("interface descriptor\n"); |
ddf8abd2 MN |
1740 | if (length != sizeof *ds) |
1741 | goto inv_length; | |
1742 | ||
1743 | __entity(INTERFACE, ds->bInterfaceNumber); | |
1744 | if (ds->iInterface) | |
1745 | __entity(STRING, ds->iInterface); | |
1746 | } | |
1747 | break; | |
1748 | ||
1749 | case USB_DT_ENDPOINT: { | |
1750 | struct usb_endpoint_descriptor *ds = (void *)_ds; | |
aa02f172 | 1751 | pr_vdebug("endpoint descriptor\n"); |
ddf8abd2 MN |
1752 | if (length != USB_DT_ENDPOINT_SIZE && |
1753 | length != USB_DT_ENDPOINT_AUDIO_SIZE) | |
1754 | goto inv_length; | |
1755 | __entity(ENDPOINT, ds->bEndpointAddress); | |
1756 | } | |
1757 | break; | |
1758 | ||
560f1187 KB |
1759 | case HID_DT_HID: |
1760 | pr_vdebug("hid descriptor\n"); | |
1761 | if (length != sizeof(struct hid_descriptor)) | |
1762 | goto inv_length; | |
1763 | break; | |
1764 | ||
ddf8abd2 MN |
1765 | case USB_DT_OTG: |
1766 | if (length != sizeof(struct usb_otg_descriptor)) | |
1767 | goto inv_length; | |
1768 | break; | |
1769 | ||
1770 | case USB_DT_INTERFACE_ASSOCIATION: { | |
1771 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; | |
aa02f172 | 1772 | pr_vdebug("interface association descriptor\n"); |
ddf8abd2 MN |
1773 | if (length != sizeof *ds) |
1774 | goto inv_length; | |
1775 | if (ds->iFunction) | |
1776 | __entity(STRING, ds->iFunction); | |
1777 | } | |
1778 | break; | |
1779 | ||
8d4e897b MG |
1780 | case USB_DT_SS_ENDPOINT_COMP: |
1781 | pr_vdebug("EP SS companion descriptor\n"); | |
1782 | if (length != sizeof(struct usb_ss_ep_comp_descriptor)) | |
1783 | goto inv_length; | |
1784 | break; | |
1785 | ||
ddf8abd2 MN |
1786 | case USB_DT_OTHER_SPEED_CONFIG: |
1787 | case USB_DT_INTERFACE_POWER: | |
1788 | case USB_DT_DEBUG: | |
1789 | case USB_DT_SECURITY: | |
1790 | case USB_DT_CS_RADIO_CONTROL: | |
1791 | /* TODO */ | |
aa02f172 | 1792 | pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1793 | return -EINVAL; |
1794 | ||
1795 | default: | |
1796 | /* We should never be here */ | |
aa02f172 | 1797 | pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1798 | return -EINVAL; |
1799 | ||
5ab54cf7 | 1800 | inv_length: |
aa02f172 | 1801 | pr_vdebug("invalid length: %d (descriptor %d)\n", |
d8df0b61 | 1802 | _ds->bLength, _ds->bDescriptorType); |
ddf8abd2 MN |
1803 | return -EINVAL; |
1804 | } | |
1805 | ||
1806 | #undef __entity | |
1807 | #undef __entity_check_DESCRIPTOR | |
1808 | #undef __entity_check_INTERFACE | |
1809 | #undef __entity_check_STRING | |
1810 | #undef __entity_check_ENDPOINT | |
1811 | ||
1812 | return length; | |
1813 | } | |
1814 | ||
ddf8abd2 MN |
1815 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
1816 | ffs_entity_callback entity, void *priv) | |
1817 | { | |
1818 | const unsigned _len = len; | |
1819 | unsigned long num = 0; | |
1820 | ||
1821 | ENTER(); | |
1822 | ||
1823 | for (;;) { | |
1824 | int ret; | |
1825 | ||
1826 | if (num == count) | |
1827 | data = NULL; | |
1828 | ||
5ab54cf7 | 1829 | /* Record "descriptor" entity */ |
ddf8abd2 MN |
1830 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
1831 | if (unlikely(ret < 0)) { | |
aa02f172 | 1832 | pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", |
d8df0b61 | 1833 | num, ret); |
ddf8abd2 MN |
1834 | return ret; |
1835 | } | |
1836 | ||
1837 | if (!data) | |
1838 | return _len - len; | |
1839 | ||
f96cbd14 | 1840 | ret = ffs_do_single_desc(data, len, entity, priv); |
ddf8abd2 | 1841 | if (unlikely(ret < 0)) { |
aa02f172 | 1842 | pr_debug("%s returns %d\n", __func__, ret); |
ddf8abd2 MN |
1843 | return ret; |
1844 | } | |
1845 | ||
1846 | len -= ret; | |
1847 | data += ret; | |
1848 | ++num; | |
1849 | } | |
1850 | } | |
1851 | ||
ddf8abd2 MN |
1852 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
1853 | u8 *valuep, struct usb_descriptor_header *desc, | |
1854 | void *priv) | |
1855 | { | |
1856 | struct ffs_data *ffs = priv; | |
1857 | ||
1858 | ENTER(); | |
1859 | ||
1860 | switch (type) { | |
1861 | case FFS_DESCRIPTOR: | |
1862 | break; | |
1863 | ||
1864 | case FFS_INTERFACE: | |
5ab54cf7 MN |
1865 | /* |
1866 | * Interfaces are indexed from zero so if we | |
ddf8abd2 | 1867 | * encountered interface "n" then there are at least |
5ab54cf7 MN |
1868 | * "n+1" interfaces. |
1869 | */ | |
ddf8abd2 MN |
1870 | if (*valuep >= ffs->interfaces_count) |
1871 | ffs->interfaces_count = *valuep + 1; | |
1872 | break; | |
1873 | ||
1874 | case FFS_STRING: | |
5ab54cf7 MN |
1875 | /* |
1876 | * Strings are indexed from 1 (0 is magic ;) reserved | |
1877 | * for languages list or some such) | |
1878 | */ | |
ddf8abd2 MN |
1879 | if (*valuep > ffs->strings_count) |
1880 | ffs->strings_count = *valuep; | |
1881 | break; | |
1882 | ||
1883 | case FFS_ENDPOINT: | |
1884 | /* Endpoints are indexed from 1 as well. */ | |
1885 | if ((*valuep & USB_ENDPOINT_NUMBER_MASK) > ffs->eps_count) | |
1886 | ffs->eps_count = (*valuep & USB_ENDPOINT_NUMBER_MASK); | |
1887 | break; | |
1888 | } | |
1889 | ||
1890 | return 0; | |
1891 | } | |
1892 | ||
f0175ab5 AP |
1893 | static int __ffs_do_os_desc_header(enum ffs_os_desc_type *next_type, |
1894 | struct usb_os_desc_header *desc) | |
1895 | { | |
1896 | u16 bcd_version = le16_to_cpu(desc->bcdVersion); | |
1897 | u16 w_index = le16_to_cpu(desc->wIndex); | |
1898 | ||
1899 | if (bcd_version != 1) { | |
1900 | pr_vdebug("unsupported os descriptors version: %d", | |
1901 | bcd_version); | |
1902 | return -EINVAL; | |
1903 | } | |
1904 | switch (w_index) { | |
1905 | case 0x4: | |
1906 | *next_type = FFS_OS_DESC_EXT_COMPAT; | |
1907 | break; | |
1908 | case 0x5: | |
1909 | *next_type = FFS_OS_DESC_EXT_PROP; | |
1910 | break; | |
1911 | default: | |
1912 | pr_vdebug("unsupported os descriptor type: %d", w_index); | |
1913 | return -EINVAL; | |
1914 | } | |
1915 | ||
1916 | return sizeof(*desc); | |
1917 | } | |
1918 | ||
1919 | /* | |
1920 | * Process all extended compatibility/extended property descriptors | |
1921 | * of a feature descriptor | |
1922 | */ | |
1923 | static int __must_check ffs_do_single_os_desc(char *data, unsigned len, | |
1924 | enum ffs_os_desc_type type, | |
1925 | u16 feature_count, | |
1926 | ffs_os_desc_callback entity, | |
1927 | void *priv, | |
1928 | struct usb_os_desc_header *h) | |
1929 | { | |
1930 | int ret; | |
1931 | const unsigned _len = len; | |
1932 | ||
1933 | ENTER(); | |
1934 | ||
1935 | /* loop over all ext compat/ext prop descriptors */ | |
1936 | while (feature_count--) { | |
1937 | ret = entity(type, h, data, len, priv); | |
1938 | if (unlikely(ret < 0)) { | |
1939 | pr_debug("bad OS descriptor, type: %d\n", type); | |
1940 | return ret; | |
1941 | } | |
1942 | data += ret; | |
1943 | len -= ret; | |
1944 | } | |
1945 | return _len - len; | |
1946 | } | |
1947 | ||
1948 | /* Process a number of complete Feature Descriptors (Ext Compat or Ext Prop) */ | |
1949 | static int __must_check ffs_do_os_descs(unsigned count, | |
1950 | char *data, unsigned len, | |
1951 | ffs_os_desc_callback entity, void *priv) | |
1952 | { | |
1953 | const unsigned _len = len; | |
1954 | unsigned long num = 0; | |
1955 | ||
1956 | ENTER(); | |
1957 | ||
1958 | for (num = 0; num < count; ++num) { | |
1959 | int ret; | |
1960 | enum ffs_os_desc_type type; | |
1961 | u16 feature_count; | |
1962 | struct usb_os_desc_header *desc = (void *)data; | |
1963 | ||
1964 | if (len < sizeof(*desc)) | |
1965 | return -EINVAL; | |
1966 | ||
1967 | /* | |
1968 | * Record "descriptor" entity. | |
1969 | * Process dwLength, bcdVersion, wIndex, get b/wCount. | |
1970 | * Move the data pointer to the beginning of extended | |
1971 | * compatibilities proper or extended properties proper | |
1972 | * portions of the data | |
1973 | */ | |
1974 | if (le32_to_cpu(desc->dwLength) > len) | |
1975 | return -EINVAL; | |
1976 | ||
1977 | ret = __ffs_do_os_desc_header(&type, desc); | |
1978 | if (unlikely(ret < 0)) { | |
1979 | pr_debug("entity OS_DESCRIPTOR(%02lx); ret = %d\n", | |
1980 | num, ret); | |
1981 | return ret; | |
1982 | } | |
1983 | /* | |
1984 | * 16-bit hex "?? 00" Little Endian looks like 8-bit hex "??" | |
1985 | */ | |
1986 | feature_count = le16_to_cpu(desc->wCount); | |
1987 | if (type == FFS_OS_DESC_EXT_COMPAT && | |
1988 | (feature_count > 255 || desc->Reserved)) | |
1989 | return -EINVAL; | |
1990 | len -= ret; | |
1991 | data += ret; | |
1992 | ||
1993 | /* | |
1994 | * Process all function/property descriptors | |
1995 | * of this Feature Descriptor | |
1996 | */ | |
1997 | ret = ffs_do_single_os_desc(data, len, type, | |
1998 | feature_count, entity, priv, desc); | |
1999 | if (unlikely(ret < 0)) { | |
2000 | pr_debug("%s returns %d\n", __func__, ret); | |
2001 | return ret; | |
2002 | } | |
2003 | ||
2004 | len -= ret; | |
2005 | data += ret; | |
2006 | } | |
2007 | return _len - len; | |
2008 | } | |
2009 | ||
2010 | /** | |
2011 | * Validate contents of the buffer from userspace related to OS descriptors. | |
2012 | */ | |
2013 | static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, | |
2014 | struct usb_os_desc_header *h, void *data, | |
2015 | unsigned len, void *priv) | |
2016 | { | |
2017 | struct ffs_data *ffs = priv; | |
2018 | u8 length; | |
2019 | ||
2020 | ENTER(); | |
2021 | ||
2022 | switch (type) { | |
2023 | case FFS_OS_DESC_EXT_COMPAT: { | |
2024 | struct usb_ext_compat_desc *d = data; | |
2025 | int i; | |
2026 | ||
2027 | if (len < sizeof(*d) || | |
2028 | d->bFirstInterfaceNumber >= ffs->interfaces_count || | |
2029 | d->Reserved1) | |
2030 | return -EINVAL; | |
2031 | for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) | |
2032 | if (d->Reserved2[i]) | |
2033 | return -EINVAL; | |
2034 | ||
2035 | length = sizeof(struct usb_ext_compat_desc); | |
2036 | } | |
2037 | break; | |
2038 | case FFS_OS_DESC_EXT_PROP: { | |
2039 | struct usb_ext_prop_desc *d = data; | |
2040 | u32 type, pdl; | |
2041 | u16 pnl; | |
2042 | ||
2043 | if (len < sizeof(*d) || h->interface >= ffs->interfaces_count) | |
2044 | return -EINVAL; | |
2045 | length = le32_to_cpu(d->dwSize); | |
2046 | type = le32_to_cpu(d->dwPropertyDataType); | |
2047 | if (type < USB_EXT_PROP_UNICODE || | |
2048 | type > USB_EXT_PROP_UNICODE_MULTI) { | |
2049 | pr_vdebug("unsupported os descriptor property type: %d", | |
2050 | type); | |
2051 | return -EINVAL; | |
2052 | } | |
2053 | pnl = le16_to_cpu(d->wPropertyNameLength); | |
2054 | pdl = le32_to_cpu(*(u32 *)((u8 *)data + 10 + pnl)); | |
2055 | if (length != 14 + pnl + pdl) { | |
2056 | pr_vdebug("invalid os descriptor length: %d pnl:%d pdl:%d (descriptor %d)\n", | |
2057 | length, pnl, pdl, type); | |
2058 | return -EINVAL; | |
2059 | } | |
2060 | ++ffs->ms_os_descs_ext_prop_count; | |
2061 | /* property name reported to the host as "WCHAR"s */ | |
2062 | ffs->ms_os_descs_ext_prop_name_len += pnl * 2; | |
2063 | ffs->ms_os_descs_ext_prop_data_len += pdl; | |
2064 | } | |
2065 | break; | |
2066 | default: | |
2067 | pr_vdebug("unknown descriptor: %d\n", type); | |
2068 | return -EINVAL; | |
2069 | } | |
2070 | return length; | |
2071 | } | |
2072 | ||
ddf8abd2 MN |
2073 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
2074 | char *const _data, size_t len) | |
2075 | { | |
ac8dde11 | 2076 | char *data = _data, *raw_descs; |
f0175ab5 | 2077 | unsigned os_descs_count = 0, counts[3], flags; |
ac8dde11 | 2078 | int ret = -EINVAL, i; |
ddf8abd2 MN |
2079 | |
2080 | ENTER(); | |
2081 | ||
ac8dde11 | 2082 | if (get_unaligned_le32(data + 4) != len) |
ddf8abd2 | 2083 | goto error; |
ddf8abd2 | 2084 | |
ac8dde11 MN |
2085 | switch (get_unaligned_le32(data)) { |
2086 | case FUNCTIONFS_DESCRIPTORS_MAGIC: | |
2087 | flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; | |
2088 | data += 8; | |
2089 | len -= 8; | |
2090 | break; | |
2091 | case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: | |
2092 | flags = get_unaligned_le32(data + 8); | |
2093 | if (flags & ~(FUNCTIONFS_HAS_FS_DESC | | |
2094 | FUNCTIONFS_HAS_HS_DESC | | |
f0175ab5 AP |
2095 | FUNCTIONFS_HAS_SS_DESC | |
2096 | FUNCTIONFS_HAS_MS_OS_DESC)) { | |
ac8dde11 | 2097 | ret = -ENOSYS; |
ddf8abd2 MN |
2098 | goto error; |
2099 | } | |
ac8dde11 MN |
2100 | data += 12; |
2101 | len -= 12; | |
2102 | break; | |
2103 | default: | |
2104 | goto error; | |
ddf8abd2 | 2105 | } |
ddf8abd2 | 2106 | |
ac8dde11 MN |
2107 | /* Read fs_count, hs_count and ss_count (if present) */ |
2108 | for (i = 0; i < 3; ++i) { | |
2109 | if (!(flags & (1 << i))) { | |
2110 | counts[i] = 0; | |
2111 | } else if (len < 4) { | |
8d4e897b | 2112 | goto error; |
ac8dde11 MN |
2113 | } else { |
2114 | counts[i] = get_unaligned_le32(data); | |
2115 | data += 4; | |
2116 | len -= 4; | |
8d4e897b | 2117 | } |
ddf8abd2 | 2118 | } |
f0175ab5 AP |
2119 | if (flags & (1 << i)) { |
2120 | os_descs_count = get_unaligned_le32(data); | |
2121 | data += 4; | |
2122 | len -= 4; | |
2123 | }; | |
ddf8abd2 | 2124 | |
ac8dde11 MN |
2125 | /* Read descriptors */ |
2126 | raw_descs = data; | |
2127 | for (i = 0; i < 3; ++i) { | |
2128 | if (!counts[i]) | |
2129 | continue; | |
2130 | ret = ffs_do_descs(counts[i], data, len, | |
ddf8abd2 | 2131 | __ffs_data_do_entity, ffs); |
ac8dde11 | 2132 | if (ret < 0) |
ddf8abd2 | 2133 | goto error; |
ac8dde11 MN |
2134 | data += ret; |
2135 | len -= ret; | |
ddf8abd2 | 2136 | } |
f0175ab5 AP |
2137 | if (os_descs_count) { |
2138 | ret = ffs_do_os_descs(os_descs_count, data, len, | |
2139 | __ffs_data_do_os_desc, ffs); | |
2140 | if (ret < 0) | |
2141 | goto error; | |
2142 | data += ret; | |
2143 | len -= ret; | |
2144 | } | |
ddf8abd2 | 2145 | |
ac8dde11 MN |
2146 | if (raw_descs == data || len) { |
2147 | ret = -EINVAL; | |
2148 | goto error; | |
2149 | } | |
ddf8abd2 | 2150 | |
ac8dde11 MN |
2151 | ffs->raw_descs_data = _data; |
2152 | ffs->raw_descs = raw_descs; | |
2153 | ffs->raw_descs_length = data - raw_descs; | |
2154 | ffs->fs_descs_count = counts[0]; | |
2155 | ffs->hs_descs_count = counts[1]; | |
2156 | ffs->ss_descs_count = counts[2]; | |
f0175ab5 | 2157 | ffs->ms_os_descs_count = os_descs_count; |
ddf8abd2 MN |
2158 | |
2159 | return 0; | |
2160 | ||
ddf8abd2 MN |
2161 | error: |
2162 | kfree(_data); | |
2163 | return ret; | |
2164 | } | |
2165 | ||
ddf8abd2 MN |
2166 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
2167 | char *const _data, size_t len) | |
2168 | { | |
2169 | u32 str_count, needed_count, lang_count; | |
2170 | struct usb_gadget_strings **stringtabs, *t; | |
2171 | struct usb_string *strings, *s; | |
2172 | const char *data = _data; | |
2173 | ||
2174 | ENTER(); | |
2175 | ||
2176 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || | |
2177 | get_unaligned_le32(data + 4) != len)) | |
2178 | goto error; | |
2179 | str_count = get_unaligned_le32(data + 8); | |
2180 | lang_count = get_unaligned_le32(data + 12); | |
2181 | ||
2182 | /* if one is zero the other must be zero */ | |
2183 | if (unlikely(!str_count != !lang_count)) | |
2184 | goto error; | |
2185 | ||
2186 | /* Do we have at least as many strings as descriptors need? */ | |
2187 | needed_count = ffs->strings_count; | |
2188 | if (unlikely(str_count < needed_count)) | |
2189 | goto error; | |
2190 | ||
5ab54cf7 MN |
2191 | /* |
2192 | * If we don't need any strings just return and free all | |
2193 | * memory. | |
2194 | */ | |
ddf8abd2 MN |
2195 | if (!needed_count) { |
2196 | kfree(_data); | |
2197 | return 0; | |
2198 | } | |
2199 | ||
5ab54cf7 | 2200 | /* Allocate everything in one chunk so there's less maintenance. */ |
ddf8abd2 | 2201 | { |
ddf8abd2 | 2202 | unsigned i = 0; |
e6f3862f AP |
2203 | vla_group(d); |
2204 | vla_item(d, struct usb_gadget_strings *, stringtabs, | |
2205 | lang_count + 1); | |
2206 | vla_item(d, struct usb_gadget_strings, stringtab, lang_count); | |
2207 | vla_item(d, struct usb_string, strings, | |
2208 | lang_count*(needed_count+1)); | |
ddf8abd2 | 2209 | |
e6f3862f AP |
2210 | char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); |
2211 | ||
2212 | if (unlikely(!vlabuf)) { | |
ddf8abd2 MN |
2213 | kfree(_data); |
2214 | return -ENOMEM; | |
2215 | } | |
2216 | ||
e6f3862f AP |
2217 | /* Initialize the VLA pointers */ |
2218 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2219 | t = vla_ptr(vlabuf, d, stringtab); | |
ddf8abd2 MN |
2220 | i = lang_count; |
2221 | do { | |
2222 | *stringtabs++ = t++; | |
2223 | } while (--i); | |
2224 | *stringtabs = NULL; | |
2225 | ||
e6f3862f AP |
2226 | /* stringtabs = vlabuf = d_stringtabs for later kfree */ |
2227 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2228 | t = vla_ptr(vlabuf, d, stringtab); | |
2229 | s = vla_ptr(vlabuf, d, strings); | |
ddf8abd2 MN |
2230 | strings = s; |
2231 | } | |
2232 | ||
2233 | /* For each language */ | |
2234 | data += 16; | |
2235 | len -= 16; | |
2236 | ||
2237 | do { /* lang_count > 0 so we can use do-while */ | |
2238 | unsigned needed = needed_count; | |
2239 | ||
2240 | if (unlikely(len < 3)) | |
2241 | goto error_free; | |
2242 | t->language = get_unaligned_le16(data); | |
2243 | t->strings = s; | |
2244 | ++t; | |
2245 | ||
2246 | data += 2; | |
2247 | len -= 2; | |
2248 | ||
2249 | /* For each string */ | |
2250 | do { /* str_count > 0 so we can use do-while */ | |
2251 | size_t length = strnlen(data, len); | |
2252 | ||
2253 | if (unlikely(length == len)) | |
2254 | goto error_free; | |
2255 | ||
5ab54cf7 MN |
2256 | /* |
2257 | * User may provide more strings then we need, | |
2258 | * if that's the case we simply ignore the | |
2259 | * rest | |
2260 | */ | |
ddf8abd2 | 2261 | if (likely(needed)) { |
5ab54cf7 MN |
2262 | /* |
2263 | * s->id will be set while adding | |
ddf8abd2 | 2264 | * function to configuration so for |
5ab54cf7 MN |
2265 | * now just leave garbage here. |
2266 | */ | |
ddf8abd2 MN |
2267 | s->s = data; |
2268 | --needed; | |
2269 | ++s; | |
2270 | } | |
2271 | ||
2272 | data += length + 1; | |
2273 | len -= length + 1; | |
2274 | } while (--str_count); | |
2275 | ||
2276 | s->id = 0; /* terminator */ | |
2277 | s->s = NULL; | |
2278 | ++s; | |
2279 | ||
2280 | } while (--lang_count); | |
2281 | ||
2282 | /* Some garbage left? */ | |
2283 | if (unlikely(len)) | |
2284 | goto error_free; | |
2285 | ||
2286 | /* Done! */ | |
2287 | ffs->stringtabs = stringtabs; | |
2288 | ffs->raw_strings = _data; | |
2289 | ||
2290 | return 0; | |
2291 | ||
2292 | error_free: | |
2293 | kfree(stringtabs); | |
2294 | error: | |
2295 | kfree(_data); | |
2296 | return -EINVAL; | |
2297 | } | |
2298 | ||
2299 | ||
ddf8abd2 MN |
2300 | /* Events handling and management *******************************************/ |
2301 | ||
2302 | static void __ffs_event_add(struct ffs_data *ffs, | |
2303 | enum usb_functionfs_event_type type) | |
2304 | { | |
2305 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; | |
2306 | int neg = 0; | |
2307 | ||
5ab54cf7 MN |
2308 | /* |
2309 | * Abort any unhandled setup | |
2310 | * | |
2311 | * We do not need to worry about some cmpxchg() changing value | |
ddf8abd2 MN |
2312 | * of ffs->setup_state without holding the lock because when |
2313 | * state is FFS_SETUP_PENDING cmpxchg() in several places in | |
5ab54cf7 MN |
2314 | * the source does nothing. |
2315 | */ | |
ddf8abd2 | 2316 | if (ffs->setup_state == FFS_SETUP_PENDING) |
e46318a0 | 2317 | ffs->setup_state = FFS_SETUP_CANCELLED; |
ddf8abd2 MN |
2318 | |
2319 | switch (type) { | |
2320 | case FUNCTIONFS_RESUME: | |
2321 | rem_type2 = FUNCTIONFS_SUSPEND; | |
5ab54cf7 | 2322 | /* FALL THROUGH */ |
ddf8abd2 MN |
2323 | case FUNCTIONFS_SUSPEND: |
2324 | case FUNCTIONFS_SETUP: | |
2325 | rem_type1 = type; | |
5ab54cf7 | 2326 | /* Discard all similar events */ |
ddf8abd2 MN |
2327 | break; |
2328 | ||
2329 | case FUNCTIONFS_BIND: | |
2330 | case FUNCTIONFS_UNBIND: | |
2331 | case FUNCTIONFS_DISABLE: | |
2332 | case FUNCTIONFS_ENABLE: | |
5ab54cf7 | 2333 | /* Discard everything other then power management. */ |
ddf8abd2 MN |
2334 | rem_type1 = FUNCTIONFS_SUSPEND; |
2335 | rem_type2 = FUNCTIONFS_RESUME; | |
2336 | neg = 1; | |
2337 | break; | |
2338 | ||
2339 | default: | |
2340 | BUG(); | |
2341 | } | |
2342 | ||
2343 | { | |
2344 | u8 *ev = ffs->ev.types, *out = ev; | |
2345 | unsigned n = ffs->ev.count; | |
2346 | for (; n; --n, ++ev) | |
2347 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) | |
2348 | *out++ = *ev; | |
2349 | else | |
aa02f172 | 2350 | pr_vdebug("purging event %d\n", *ev); |
ddf8abd2 MN |
2351 | ffs->ev.count = out - ffs->ev.types; |
2352 | } | |
2353 | ||
aa02f172 | 2354 | pr_vdebug("adding event %d\n", type); |
ddf8abd2 MN |
2355 | ffs->ev.types[ffs->ev.count++] = type; |
2356 | wake_up_locked(&ffs->ev.waitq); | |
2357 | } | |
2358 | ||
2359 | static void ffs_event_add(struct ffs_data *ffs, | |
2360 | enum usb_functionfs_event_type type) | |
2361 | { | |
2362 | unsigned long flags; | |
2363 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2364 | __ffs_event_add(ffs, type); | |
2365 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2366 | } | |
2367 | ||
2368 | ||
2369 | /* Bind/unbind USB function hooks *******************************************/ | |
2370 | ||
2371 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, | |
2372 | struct usb_descriptor_header *desc, | |
2373 | void *priv) | |
2374 | { | |
2375 | struct usb_endpoint_descriptor *ds = (void *)desc; | |
2376 | struct ffs_function *func = priv; | |
2377 | struct ffs_ep *ffs_ep; | |
85b06f5e DC |
2378 | unsigned ep_desc_id; |
2379 | int idx; | |
8d4e897b | 2380 | static const char *speed_names[] = { "full", "high", "super" }; |
ddf8abd2 MN |
2381 | |
2382 | if (type != FFS_DESCRIPTOR) | |
2383 | return 0; | |
2384 | ||
8d4e897b MG |
2385 | /* |
2386 | * If ss_descriptors is not NULL, we are reading super speed | |
2387 | * descriptors; if hs_descriptors is not NULL, we are reading high | |
2388 | * speed descriptors; otherwise, we are reading full speed | |
2389 | * descriptors. | |
2390 | */ | |
2391 | if (func->function.ss_descriptors) { | |
2392 | ep_desc_id = 2; | |
2393 | func->function.ss_descriptors[(long)valuep] = desc; | |
2394 | } else if (func->function.hs_descriptors) { | |
2395 | ep_desc_id = 1; | |
ddf8abd2 | 2396 | func->function.hs_descriptors[(long)valuep] = desc; |
8d4e897b MG |
2397 | } else { |
2398 | ep_desc_id = 0; | |
10287bae | 2399 | func->function.fs_descriptors[(long)valuep] = desc; |
8d4e897b | 2400 | } |
ddf8abd2 MN |
2401 | |
2402 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) | |
2403 | return 0; | |
2404 | ||
2405 | idx = (ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2406 | ffs_ep = func->eps + idx; | |
2407 | ||
8d4e897b MG |
2408 | if (unlikely(ffs_ep->descs[ep_desc_id])) { |
2409 | pr_err("two %sspeed descriptors for EP %d\n", | |
2410 | speed_names[ep_desc_id], | |
d8df0b61 | 2411 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
ddf8abd2 MN |
2412 | return -EINVAL; |
2413 | } | |
8d4e897b | 2414 | ffs_ep->descs[ep_desc_id] = ds; |
ddf8abd2 MN |
2415 | |
2416 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); | |
2417 | if (ffs_ep->ep) { | |
2418 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; | |
2419 | if (!ds->wMaxPacketSize) | |
2420 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; | |
2421 | } else { | |
2422 | struct usb_request *req; | |
2423 | struct usb_ep *ep; | |
2424 | ||
aa02f172 | 2425 | pr_vdebug("autoconfig\n"); |
ddf8abd2 MN |
2426 | ep = usb_ep_autoconfig(func->gadget, ds); |
2427 | if (unlikely(!ep)) | |
2428 | return -ENOTSUPP; | |
cc7e6056 | 2429 | ep->driver_data = func->eps + idx; |
ddf8abd2 MN |
2430 | |
2431 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
2432 | if (unlikely(!req)) | |
2433 | return -ENOMEM; | |
2434 | ||
2435 | ffs_ep->ep = ep; | |
2436 | ffs_ep->req = req; | |
2437 | func->eps_revmap[ds->bEndpointAddress & | |
2438 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; | |
2439 | } | |
2440 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); | |
2441 | ||
2442 | return 0; | |
2443 | } | |
2444 | ||
ddf8abd2 MN |
2445 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, |
2446 | struct usb_descriptor_header *desc, | |
2447 | void *priv) | |
2448 | { | |
2449 | struct ffs_function *func = priv; | |
2450 | unsigned idx; | |
2451 | u8 newValue; | |
2452 | ||
2453 | switch (type) { | |
2454 | default: | |
2455 | case FFS_DESCRIPTOR: | |
2456 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ | |
2457 | return 0; | |
2458 | ||
2459 | case FFS_INTERFACE: | |
2460 | idx = *valuep; | |
2461 | if (func->interfaces_nums[idx] < 0) { | |
2462 | int id = usb_interface_id(func->conf, &func->function); | |
2463 | if (unlikely(id < 0)) | |
2464 | return id; | |
2465 | func->interfaces_nums[idx] = id; | |
2466 | } | |
2467 | newValue = func->interfaces_nums[idx]; | |
2468 | break; | |
2469 | ||
2470 | case FFS_STRING: | |
2471 | /* String' IDs are allocated when fsf_data is bound to cdev */ | |
2472 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; | |
2473 | break; | |
2474 | ||
2475 | case FFS_ENDPOINT: | |
5ab54cf7 MN |
2476 | /* |
2477 | * USB_DT_ENDPOINT are handled in | |
2478 | * __ffs_func_bind_do_descs(). | |
2479 | */ | |
ddf8abd2 MN |
2480 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
2481 | return 0; | |
2482 | ||
2483 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2484 | if (unlikely(!func->eps[idx].ep)) | |
2485 | return -EINVAL; | |
2486 | ||
2487 | { | |
2488 | struct usb_endpoint_descriptor **descs; | |
2489 | descs = func->eps[idx].descs; | |
2490 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; | |
2491 | } | |
2492 | break; | |
2493 | } | |
2494 | ||
aa02f172 | 2495 | pr_vdebug("%02x -> %02x\n", *valuep, newValue); |
ddf8abd2 MN |
2496 | *valuep = newValue; |
2497 | return 0; | |
2498 | } | |
2499 | ||
f0175ab5 AP |
2500 | static int __ffs_func_bind_do_os_desc(enum ffs_os_desc_type type, |
2501 | struct usb_os_desc_header *h, void *data, | |
2502 | unsigned len, void *priv) | |
2503 | { | |
2504 | struct ffs_function *func = priv; | |
2505 | u8 length = 0; | |
2506 | ||
2507 | switch (type) { | |
2508 | case FFS_OS_DESC_EXT_COMPAT: { | |
2509 | struct usb_ext_compat_desc *desc = data; | |
2510 | struct usb_os_desc_table *t; | |
2511 | ||
2512 | t = &func->function.os_desc_table[desc->bFirstInterfaceNumber]; | |
2513 | t->if_id = func->interfaces_nums[desc->bFirstInterfaceNumber]; | |
2514 | memcpy(t->os_desc->ext_compat_id, &desc->CompatibleID, | |
2515 | ARRAY_SIZE(desc->CompatibleID) + | |
2516 | ARRAY_SIZE(desc->SubCompatibleID)); | |
2517 | length = sizeof(*desc); | |
2518 | } | |
2519 | break; | |
2520 | case FFS_OS_DESC_EXT_PROP: { | |
2521 | struct usb_ext_prop_desc *desc = data; | |
2522 | struct usb_os_desc_table *t; | |
2523 | struct usb_os_desc_ext_prop *ext_prop; | |
2524 | char *ext_prop_name; | |
2525 | char *ext_prop_data; | |
2526 | ||
2527 | t = &func->function.os_desc_table[h->interface]; | |
2528 | t->if_id = func->interfaces_nums[h->interface]; | |
2529 | ||
2530 | ext_prop = func->ffs->ms_os_descs_ext_prop_avail; | |
2531 | func->ffs->ms_os_descs_ext_prop_avail += sizeof(*ext_prop); | |
2532 | ||
2533 | ext_prop->type = le32_to_cpu(desc->dwPropertyDataType); | |
2534 | ext_prop->name_len = le16_to_cpu(desc->wPropertyNameLength); | |
2535 | ext_prop->data_len = le32_to_cpu(*(u32 *) | |
2536 | usb_ext_prop_data_len_ptr(data, ext_prop->name_len)); | |
2537 | length = ext_prop->name_len + ext_prop->data_len + 14; | |
2538 | ||
2539 | ext_prop_name = func->ffs->ms_os_descs_ext_prop_name_avail; | |
2540 | func->ffs->ms_os_descs_ext_prop_name_avail += | |
2541 | ext_prop->name_len; | |
2542 | ||
2543 | ext_prop_data = func->ffs->ms_os_descs_ext_prop_data_avail; | |
2544 | func->ffs->ms_os_descs_ext_prop_data_avail += | |
2545 | ext_prop->data_len; | |
2546 | memcpy(ext_prop_data, | |
2547 | usb_ext_prop_data_ptr(data, ext_prop->name_len), | |
2548 | ext_prop->data_len); | |
2549 | /* unicode data reported to the host as "WCHAR"s */ | |
2550 | switch (ext_prop->type) { | |
2551 | case USB_EXT_PROP_UNICODE: | |
2552 | case USB_EXT_PROP_UNICODE_ENV: | |
2553 | case USB_EXT_PROP_UNICODE_LINK: | |
2554 | case USB_EXT_PROP_UNICODE_MULTI: | |
2555 | ext_prop->data_len *= 2; | |
2556 | break; | |
2557 | } | |
2558 | ext_prop->data = ext_prop_data; | |
2559 | ||
2560 | memcpy(ext_prop_name, usb_ext_prop_name_ptr(data), | |
2561 | ext_prop->name_len); | |
2562 | /* property name reported to the host as "WCHAR"s */ | |
2563 | ext_prop->name_len *= 2; | |
2564 | ext_prop->name = ext_prop_name; | |
2565 | ||
2566 | t->os_desc->ext_prop_len += | |
2567 | ext_prop->name_len + ext_prop->data_len + 14; | |
2568 | ++t->os_desc->ext_prop_count; | |
2569 | list_add_tail(&ext_prop->entry, &t->os_desc->ext_prop); | |
2570 | } | |
2571 | break; | |
2572 | default: | |
2573 | pr_vdebug("unknown descriptor: %d\n", type); | |
2574 | } | |
2575 | ||
2576 | return length; | |
2577 | } | |
2578 | ||
5920cda6 AP |
2579 | static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, |
2580 | struct usb_configuration *c) | |
2581 | { | |
2582 | struct ffs_function *func = ffs_func_from_usb(f); | |
2583 | struct f_fs_opts *ffs_opts = | |
2584 | container_of(f->fi, struct f_fs_opts, func_inst); | |
2585 | int ret; | |
2586 | ||
2587 | ENTER(); | |
2588 | ||
2589 | /* | |
2590 | * Legacy gadget triggers binding in functionfs_ready_callback, | |
2591 | * which already uses locking; taking the same lock here would | |
2592 | * cause a deadlock. | |
2593 | * | |
2594 | * Configfs-enabled gadgets however do need ffs_dev_lock. | |
2595 | */ | |
2596 | if (!ffs_opts->no_configfs) | |
2597 | ffs_dev_lock(); | |
2598 | ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; | |
2599 | func->ffs = ffs_opts->dev->ffs_data; | |
2600 | if (!ffs_opts->no_configfs) | |
2601 | ffs_dev_unlock(); | |
2602 | if (ret) | |
2603 | return ERR_PTR(ret); | |
2604 | ||
2605 | func->conf = c; | |
2606 | func->gadget = c->cdev->gadget; | |
2607 | ||
2608 | ffs_data_get(func->ffs); | |
2609 | ||
2610 | /* | |
2611 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
2612 | * configurations are bound in sequence with list_for_each_entry, | |
2613 | * in each configuration its functions are bound in sequence | |
2614 | * with list_for_each_entry, so we assume no race condition | |
2615 | * with regard to ffs_opts->bound access | |
2616 | */ | |
2617 | if (!ffs_opts->refcnt) { | |
2618 | ret = functionfs_bind(func->ffs, c->cdev); | |
2619 | if (ret) | |
2620 | return ERR_PTR(ret); | |
2621 | } | |
2622 | ffs_opts->refcnt++; | |
2623 | func->function.strings = func->ffs->stringtabs; | |
2624 | ||
2625 | return ffs_opts; | |
2626 | } | |
5920cda6 AP |
2627 | |
2628 | static int _ffs_func_bind(struct usb_configuration *c, | |
2629 | struct usb_function *f) | |
ddf8abd2 MN |
2630 | { |
2631 | struct ffs_function *func = ffs_func_from_usb(f); | |
2632 | struct ffs_data *ffs = func->ffs; | |
2633 | ||
2634 | const int full = !!func->ffs->fs_descs_count; | |
2635 | const int high = gadget_is_dualspeed(func->gadget) && | |
2636 | func->ffs->hs_descs_count; | |
8d4e897b MG |
2637 | const int super = gadget_is_superspeed(func->gadget) && |
2638 | func->ffs->ss_descs_count; | |
ddf8abd2 | 2639 | |
f0175ab5 | 2640 | int fs_len, hs_len, ss_len, ret, i; |
ddf8abd2 MN |
2641 | |
2642 | /* Make it a single chunk, less management later on */ | |
e6f3862f AP |
2643 | vla_group(d); |
2644 | vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); | |
2645 | vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, | |
2646 | full ? ffs->fs_descs_count + 1 : 0); | |
2647 | vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, | |
2648 | high ? ffs->hs_descs_count + 1 : 0); | |
8d4e897b MG |
2649 | vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, |
2650 | super ? ffs->ss_descs_count + 1 : 0); | |
e6f3862f | 2651 | vla_item_with_sz(d, short, inums, ffs->interfaces_count); |
f0175ab5 AP |
2652 | vla_item_with_sz(d, struct usb_os_desc_table, os_desc_table, |
2653 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2654 | vla_item_with_sz(d, char[16], ext_compat, | |
2655 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2656 | vla_item_with_sz(d, struct usb_os_desc, os_desc, | |
2657 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2658 | vla_item_with_sz(d, struct usb_os_desc_ext_prop, ext_prop, | |
2659 | ffs->ms_os_descs_ext_prop_count); | |
2660 | vla_item_with_sz(d, char, ext_prop_name, | |
2661 | ffs->ms_os_descs_ext_prop_name_len); | |
2662 | vla_item_with_sz(d, char, ext_prop_data, | |
2663 | ffs->ms_os_descs_ext_prop_data_len); | |
ac8dde11 | 2664 | vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); |
e6f3862f | 2665 | char *vlabuf; |
ddf8abd2 MN |
2666 | |
2667 | ENTER(); | |
2668 | ||
8d4e897b MG |
2669 | /* Has descriptors only for speeds gadget does not support */ |
2670 | if (unlikely(!(full | high | super))) | |
ddf8abd2 MN |
2671 | return -ENOTSUPP; |
2672 | ||
e6f3862f | 2673 | /* Allocate a single chunk, less management later on */ |
f0175ab5 | 2674 | vlabuf = kzalloc(vla_group_size(d), GFP_KERNEL); |
e6f3862f | 2675 | if (unlikely(!vlabuf)) |
ddf8abd2 MN |
2676 | return -ENOMEM; |
2677 | ||
f0175ab5 AP |
2678 | ffs->ms_os_descs_ext_prop_avail = vla_ptr(vlabuf, d, ext_prop); |
2679 | ffs->ms_os_descs_ext_prop_name_avail = | |
2680 | vla_ptr(vlabuf, d, ext_prop_name); | |
2681 | ffs->ms_os_descs_ext_prop_data_avail = | |
2682 | vla_ptr(vlabuf, d, ext_prop_data); | |
2683 | ||
ac8dde11 MN |
2684 | /* Copy descriptors */ |
2685 | memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, | |
2686 | ffs->raw_descs_length); | |
8d4e897b | 2687 | |
e6f3862f AP |
2688 | memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); |
2689 | for (ret = ffs->eps_count; ret; --ret) { | |
2690 | struct ffs_ep *ptr; | |
2691 | ||
2692 | ptr = vla_ptr(vlabuf, d, eps); | |
2693 | ptr[ret].num = -1; | |
2694 | } | |
ddf8abd2 | 2695 | |
e6f3862f AP |
2696 | /* Save pointers |
2697 | * d_eps == vlabuf, func->eps used to kfree vlabuf later | |
2698 | */ | |
2699 | func->eps = vla_ptr(vlabuf, d, eps); | |
2700 | func->interfaces_nums = vla_ptr(vlabuf, d, inums); | |
ddf8abd2 | 2701 | |
5ab54cf7 MN |
2702 | /* |
2703 | * Go through all the endpoint descriptors and allocate | |
ddf8abd2 | 2704 | * endpoints first, so that later we can rewrite the endpoint |
5ab54cf7 MN |
2705 | * numbers without worrying that it may be described later on. |
2706 | */ | |
ddf8abd2 | 2707 | if (likely(full)) { |
e6f3862f | 2708 | func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); |
8d4e897b MG |
2709 | fs_len = ffs_do_descs(ffs->fs_descs_count, |
2710 | vla_ptr(vlabuf, d, raw_descs), | |
2711 | d_raw_descs__sz, | |
2712 | __ffs_func_bind_do_descs, func); | |
2713 | if (unlikely(fs_len < 0)) { | |
2714 | ret = fs_len; | |
ddf8abd2 | 2715 | goto error; |
8d4e897b | 2716 | } |
ddf8abd2 | 2717 | } else { |
8d4e897b | 2718 | fs_len = 0; |
ddf8abd2 MN |
2719 | } |
2720 | ||
2721 | if (likely(high)) { | |
e6f3862f | 2722 | func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); |
8d4e897b MG |
2723 | hs_len = ffs_do_descs(ffs->hs_descs_count, |
2724 | vla_ptr(vlabuf, d, raw_descs) + fs_len, | |
2725 | d_raw_descs__sz - fs_len, | |
2726 | __ffs_func_bind_do_descs, func); | |
2727 | if (unlikely(hs_len < 0)) { | |
2728 | ret = hs_len; | |
2729 | goto error; | |
2730 | } | |
2731 | } else { | |
2732 | hs_len = 0; | |
2733 | } | |
2734 | ||
2735 | if (likely(super)) { | |
2736 | func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); | |
f0175ab5 | 2737 | ss_len = ffs_do_descs(ffs->ss_descs_count, |
8d4e897b MG |
2738 | vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, |
2739 | d_raw_descs__sz - fs_len - hs_len, | |
2740 | __ffs_func_bind_do_descs, func); | |
f0175ab5 AP |
2741 | if (unlikely(ss_len < 0)) { |
2742 | ret = ss_len; | |
8854894c | 2743 | goto error; |
f0175ab5 AP |
2744 | } |
2745 | } else { | |
2746 | ss_len = 0; | |
ddf8abd2 MN |
2747 | } |
2748 | ||
5ab54cf7 MN |
2749 | /* |
2750 | * Now handle interface numbers allocation and interface and | |
2751 | * endpoint numbers rewriting. We can do that in one go | |
2752 | * now. | |
2753 | */ | |
ddf8abd2 | 2754 | ret = ffs_do_descs(ffs->fs_descs_count + |
8d4e897b MG |
2755 | (high ? ffs->hs_descs_count : 0) + |
2756 | (super ? ffs->ss_descs_count : 0), | |
e6f3862f | 2757 | vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, |
ddf8abd2 MN |
2758 | __ffs_func_bind_do_nums, func); |
2759 | if (unlikely(ret < 0)) | |
2760 | goto error; | |
2761 | ||
f0175ab5 AP |
2762 | func->function.os_desc_table = vla_ptr(vlabuf, d, os_desc_table); |
2763 | if (c->cdev->use_os_string) | |
2764 | for (i = 0; i < ffs->interfaces_count; ++i) { | |
2765 | struct usb_os_desc *desc; | |
2766 | ||
2767 | desc = func->function.os_desc_table[i].os_desc = | |
2768 | vla_ptr(vlabuf, d, os_desc) + | |
2769 | i * sizeof(struct usb_os_desc); | |
2770 | desc->ext_compat_id = | |
2771 | vla_ptr(vlabuf, d, ext_compat) + i * 16; | |
2772 | INIT_LIST_HEAD(&desc->ext_prop); | |
2773 | } | |
2774 | ret = ffs_do_os_descs(ffs->ms_os_descs_count, | |
2775 | vla_ptr(vlabuf, d, raw_descs) + | |
2776 | fs_len + hs_len + ss_len, | |
2777 | d_raw_descs__sz - fs_len - hs_len - ss_len, | |
2778 | __ffs_func_bind_do_os_desc, func); | |
2779 | if (unlikely(ret < 0)) | |
2780 | goto error; | |
2781 | func->function.os_desc_n = | |
2782 | c->cdev->use_os_string ? ffs->interfaces_count : 0; | |
2783 | ||
ddf8abd2 MN |
2784 | /* And we're done */ |
2785 | ffs_event_add(ffs, FUNCTIONFS_BIND); | |
2786 | return 0; | |
2787 | ||
2788 | error: | |
2789 | /* XXX Do we need to release all claimed endpoints here? */ | |
2790 | return ret; | |
2791 | } | |
2792 | ||
5920cda6 AP |
2793 | static int ffs_func_bind(struct usb_configuration *c, |
2794 | struct usb_function *f) | |
2795 | { | |
5920cda6 AP |
2796 | struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); |
2797 | ||
2798 | if (IS_ERR(ffs_opts)) | |
2799 | return PTR_ERR(ffs_opts); | |
5920cda6 AP |
2800 | |
2801 | return _ffs_func_bind(c, f); | |
2802 | } | |
2803 | ||
ddf8abd2 MN |
2804 | |
2805 | /* Other USB function hooks *************************************************/ | |
2806 | ||
ddf8abd2 MN |
2807 | static int ffs_func_set_alt(struct usb_function *f, |
2808 | unsigned interface, unsigned alt) | |
2809 | { | |
2810 | struct ffs_function *func = ffs_func_from_usb(f); | |
2811 | struct ffs_data *ffs = func->ffs; | |
2812 | int ret = 0, intf; | |
2813 | ||
2814 | if (alt != (unsigned)-1) { | |
2815 | intf = ffs_func_revmap_intf(func, interface); | |
2816 | if (unlikely(intf < 0)) | |
2817 | return intf; | |
2818 | } | |
2819 | ||
2820 | if (ffs->func) | |
2821 | ffs_func_eps_disable(ffs->func); | |
2822 | ||
2823 | if (ffs->state != FFS_ACTIVE) | |
2824 | return -ENODEV; | |
2825 | ||
2826 | if (alt == (unsigned)-1) { | |
2827 | ffs->func = NULL; | |
2828 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); | |
2829 | return 0; | |
2830 | } | |
2831 | ||
2832 | ffs->func = func; | |
2833 | ret = ffs_func_eps_enable(func); | |
2834 | if (likely(ret >= 0)) | |
2835 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); | |
2836 | return ret; | |
2837 | } | |
2838 | ||
2839 | static void ffs_func_disable(struct usb_function *f) | |
2840 | { | |
2841 | ffs_func_set_alt(f, 0, (unsigned)-1); | |
2842 | } | |
2843 | ||
2844 | static int ffs_func_setup(struct usb_function *f, | |
2845 | const struct usb_ctrlrequest *creq) | |
2846 | { | |
2847 | struct ffs_function *func = ffs_func_from_usb(f); | |
2848 | struct ffs_data *ffs = func->ffs; | |
2849 | unsigned long flags; | |
2850 | int ret; | |
2851 | ||
2852 | ENTER(); | |
2853 | ||
aa02f172 MN |
2854 | pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); |
2855 | pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); | |
2856 | pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); | |
2857 | pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); | |
2858 | pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); | |
ddf8abd2 | 2859 | |
5ab54cf7 MN |
2860 | /* |
2861 | * Most requests directed to interface go through here | |
ddf8abd2 MN |
2862 | * (notable exceptions are set/get interface) so we need to |
2863 | * handle them. All other either handled by composite or | |
2864 | * passed to usb_configuration->setup() (if one is set). No | |
2865 | * matter, we will handle requests directed to endpoint here | |
2866 | * as well (as it's straightforward) but what to do with any | |
5ab54cf7 MN |
2867 | * other request? |
2868 | */ | |
ddf8abd2 MN |
2869 | if (ffs->state != FFS_ACTIVE) |
2870 | return -ENODEV; | |
2871 | ||
2872 | switch (creq->bRequestType & USB_RECIP_MASK) { | |
2873 | case USB_RECIP_INTERFACE: | |
2874 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); | |
2875 | if (unlikely(ret < 0)) | |
2876 | return ret; | |
2877 | break; | |
2878 | ||
2879 | case USB_RECIP_ENDPOINT: | |
2880 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); | |
2881 | if (unlikely(ret < 0)) | |
2882 | return ret; | |
2883 | break; | |
2884 | ||
2885 | default: | |
2886 | return -EOPNOTSUPP; | |
2887 | } | |
2888 | ||
2889 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2890 | ffs->ev.setup = *creq; | |
2891 | ffs->ev.setup.wIndex = cpu_to_le16(ret); | |
2892 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); | |
2893 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2894 | ||
2895 | return 0; | |
2896 | } | |
2897 | ||
2898 | static void ffs_func_suspend(struct usb_function *f) | |
2899 | { | |
2900 | ENTER(); | |
2901 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); | |
2902 | } | |
2903 | ||
2904 | static void ffs_func_resume(struct usb_function *f) | |
2905 | { | |
2906 | ENTER(); | |
2907 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); | |
2908 | } | |
2909 | ||
2910 | ||
5ab54cf7 | 2911 | /* Endpoint and interface numbers reverse mapping ***************************/ |
ddf8abd2 MN |
2912 | |
2913 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) | |
2914 | { | |
2915 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; | |
2916 | return num ? num : -EDOM; | |
2917 | } | |
2918 | ||
2919 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) | |
2920 | { | |
2921 | short *nums = func->interfaces_nums; | |
2922 | unsigned count = func->ffs->interfaces_count; | |
2923 | ||
2924 | for (; count; --count, ++nums) { | |
2925 | if (*nums >= 0 && *nums == intf) | |
2926 | return nums - func->interfaces_nums; | |
2927 | } | |
2928 | ||
2929 | return -EDOM; | |
2930 | } | |
2931 | ||
2932 | ||
4b187fce AP |
2933 | /* Devices management *******************************************************/ |
2934 | ||
2935 | static LIST_HEAD(ffs_devices); | |
2936 | ||
da13a773 | 2937 | static struct ffs_dev *_ffs_do_find_dev(const char *name) |
4b187fce AP |
2938 | { |
2939 | struct ffs_dev *dev; | |
2940 | ||
2941 | list_for_each_entry(dev, &ffs_devices, entry) { | |
2942 | if (!dev->name || !name) | |
2943 | continue; | |
2944 | if (strcmp(dev->name, name) == 0) | |
2945 | return dev; | |
2946 | } | |
b658499f | 2947 | |
4b187fce AP |
2948 | return NULL; |
2949 | } | |
2950 | ||
2951 | /* | |
2952 | * ffs_lock must be taken by the caller of this function | |
2953 | */ | |
da13a773 | 2954 | static struct ffs_dev *_ffs_get_single_dev(void) |
4b187fce AP |
2955 | { |
2956 | struct ffs_dev *dev; | |
2957 | ||
2958 | if (list_is_singular(&ffs_devices)) { | |
2959 | dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); | |
2960 | if (dev->single) | |
2961 | return dev; | |
2962 | } | |
2963 | ||
2964 | return NULL; | |
2965 | } | |
2966 | ||
2967 | /* | |
2968 | * ffs_lock must be taken by the caller of this function | |
2969 | */ | |
da13a773 | 2970 | static struct ffs_dev *_ffs_find_dev(const char *name) |
4b187fce AP |
2971 | { |
2972 | struct ffs_dev *dev; | |
2973 | ||
da13a773 | 2974 | dev = _ffs_get_single_dev(); |
4b187fce AP |
2975 | if (dev) |
2976 | return dev; | |
2977 | ||
da13a773 | 2978 | return _ffs_do_find_dev(name); |
4b187fce AP |
2979 | } |
2980 | ||
b658499f AP |
2981 | /* Configfs support *********************************************************/ |
2982 | ||
2983 | static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) | |
2984 | { | |
2985 | return container_of(to_config_group(item), struct f_fs_opts, | |
2986 | func_inst.group); | |
2987 | } | |
2988 | ||
2989 | static void ffs_attr_release(struct config_item *item) | |
2990 | { | |
2991 | struct f_fs_opts *opts = to_ffs_opts(item); | |
2992 | ||
2993 | usb_put_function_instance(&opts->func_inst); | |
2994 | } | |
2995 | ||
2996 | static struct configfs_item_operations ffs_item_ops = { | |
2997 | .release = ffs_attr_release, | |
2998 | }; | |
2999 | ||
3000 | static struct config_item_type ffs_func_type = { | |
3001 | .ct_item_ops = &ffs_item_ops, | |
3002 | .ct_owner = THIS_MODULE, | |
3003 | }; | |
3004 | ||
3005 | ||
5920cda6 AP |
3006 | /* Function registration interface ******************************************/ |
3007 | ||
5920cda6 AP |
3008 | static void ffs_free_inst(struct usb_function_instance *f) |
3009 | { | |
3010 | struct f_fs_opts *opts; | |
3011 | ||
3012 | opts = to_f_fs_opts(f); | |
3013 | ffs_dev_lock(); | |
da13a773 | 3014 | _ffs_free_dev(opts->dev); |
5920cda6 AP |
3015 | ffs_dev_unlock(); |
3016 | kfree(opts); | |
3017 | } | |
3018 | ||
b658499f AP |
3019 | #define MAX_INST_NAME_LEN 40 |
3020 | ||
3021 | static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) | |
3022 | { | |
3023 | struct f_fs_opts *opts; | |
3024 | char *ptr; | |
3025 | const char *tmp; | |
3026 | int name_len, ret; | |
3027 | ||
3028 | name_len = strlen(name) + 1; | |
3029 | if (name_len > MAX_INST_NAME_LEN) | |
3030 | return -ENAMETOOLONG; | |
3031 | ||
3032 | ptr = kstrndup(name, name_len, GFP_KERNEL); | |
3033 | if (!ptr) | |
3034 | return -ENOMEM; | |
3035 | ||
3036 | opts = to_f_fs_opts(fi); | |
3037 | tmp = NULL; | |
3038 | ||
3039 | ffs_dev_lock(); | |
3040 | ||
3041 | tmp = opts->dev->name_allocated ? opts->dev->name : NULL; | |
3042 | ret = _ffs_name_dev(opts->dev, ptr); | |
3043 | if (ret) { | |
3044 | kfree(ptr); | |
3045 | ffs_dev_unlock(); | |
3046 | return ret; | |
3047 | } | |
3048 | opts->dev->name_allocated = true; | |
3049 | ||
3050 | ffs_dev_unlock(); | |
3051 | ||
3052 | kfree(tmp); | |
3053 | ||
3054 | return 0; | |
3055 | } | |
3056 | ||
5920cda6 AP |
3057 | static struct usb_function_instance *ffs_alloc_inst(void) |
3058 | { | |
3059 | struct f_fs_opts *opts; | |
3060 | struct ffs_dev *dev; | |
3061 | ||
3062 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3063 | if (!opts) | |
3064 | return ERR_PTR(-ENOMEM); | |
3065 | ||
b658499f | 3066 | opts->func_inst.set_inst_name = ffs_set_inst_name; |
5920cda6 AP |
3067 | opts->func_inst.free_func_inst = ffs_free_inst; |
3068 | ffs_dev_lock(); | |
da13a773 | 3069 | dev = _ffs_alloc_dev(); |
5920cda6 AP |
3070 | ffs_dev_unlock(); |
3071 | if (IS_ERR(dev)) { | |
3072 | kfree(opts); | |
3073 | return ERR_CAST(dev); | |
3074 | } | |
3075 | opts->dev = dev; | |
b658499f | 3076 | dev->opts = opts; |
5920cda6 | 3077 | |
b658499f AP |
3078 | config_group_init_type_name(&opts->func_inst.group, "", |
3079 | &ffs_func_type); | |
5920cda6 AP |
3080 | return &opts->func_inst; |
3081 | } | |
3082 | ||
3083 | static void ffs_free(struct usb_function *f) | |
3084 | { | |
3085 | kfree(ffs_func_from_usb(f)); | |
3086 | } | |
3087 | ||
3088 | static void ffs_func_unbind(struct usb_configuration *c, | |
3089 | struct usb_function *f) | |
3090 | { | |
3091 | struct ffs_function *func = ffs_func_from_usb(f); | |
3092 | struct ffs_data *ffs = func->ffs; | |
3093 | struct f_fs_opts *opts = | |
3094 | container_of(f->fi, struct f_fs_opts, func_inst); | |
3095 | struct ffs_ep *ep = func->eps; | |
3096 | unsigned count = ffs->eps_count; | |
3097 | unsigned long flags; | |
3098 | ||
3099 | ENTER(); | |
3100 | if (ffs->func == func) { | |
3101 | ffs_func_eps_disable(func); | |
3102 | ffs->func = NULL; | |
3103 | } | |
3104 | ||
3105 | if (!--opts->refcnt) | |
3106 | functionfs_unbind(ffs); | |
3107 | ||
3108 | /* cleanup after autoconfig */ | |
3109 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
3110 | do { | |
3111 | if (ep->ep && ep->req) | |
3112 | usb_ep_free_request(ep->ep, ep->req); | |
3113 | ep->req = NULL; | |
3114 | ++ep; | |
3115 | } while (--count); | |
3116 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
3117 | kfree(func->eps); | |
3118 | func->eps = NULL; | |
3119 | /* | |
3120 | * eps, descriptors and interfaces_nums are allocated in the | |
3121 | * same chunk so only one free is required. | |
3122 | */ | |
3123 | func->function.fs_descriptors = NULL; | |
3124 | func->function.hs_descriptors = NULL; | |
8d4e897b | 3125 | func->function.ss_descriptors = NULL; |
5920cda6 AP |
3126 | func->interfaces_nums = NULL; |
3127 | ||
3128 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); | |
3129 | } | |
3130 | ||
3131 | static struct usb_function *ffs_alloc(struct usb_function_instance *fi) | |
3132 | { | |
3133 | struct ffs_function *func; | |
3134 | ||
3135 | ENTER(); | |
3136 | ||
3137 | func = kzalloc(sizeof(*func), GFP_KERNEL); | |
3138 | if (unlikely(!func)) | |
3139 | return ERR_PTR(-ENOMEM); | |
3140 | ||
3141 | func->function.name = "Function FS Gadget"; | |
3142 | ||
3143 | func->function.bind = ffs_func_bind; | |
3144 | func->function.unbind = ffs_func_unbind; | |
3145 | func->function.set_alt = ffs_func_set_alt; | |
3146 | func->function.disable = ffs_func_disable; | |
3147 | func->function.setup = ffs_func_setup; | |
3148 | func->function.suspend = ffs_func_suspend; | |
3149 | func->function.resume = ffs_func_resume; | |
3150 | func->function.free_func = ffs_free; | |
3151 | ||
3152 | return &func->function; | |
3153 | } | |
3154 | ||
4b187fce AP |
3155 | /* |
3156 | * ffs_lock must be taken by the caller of this function | |
3157 | */ | |
da13a773 | 3158 | static struct ffs_dev *_ffs_alloc_dev(void) |
4b187fce AP |
3159 | { |
3160 | struct ffs_dev *dev; | |
3161 | int ret; | |
3162 | ||
da13a773 | 3163 | if (_ffs_get_single_dev()) |
4b187fce AP |
3164 | return ERR_PTR(-EBUSY); |
3165 | ||
3166 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
3167 | if (!dev) | |
3168 | return ERR_PTR(-ENOMEM); | |
3169 | ||
3170 | if (list_empty(&ffs_devices)) { | |
3171 | ret = functionfs_init(); | |
3172 | if (ret) { | |
3173 | kfree(dev); | |
3174 | return ERR_PTR(ret); | |
3175 | } | |
3176 | } | |
3177 | ||
3178 | list_add(&dev->entry, &ffs_devices); | |
3179 | ||
3180 | return dev; | |
3181 | } | |
3182 | ||
3183 | /* | |
3184 | * ffs_lock must be taken by the caller of this function | |
3185 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3186 | */ | |
3187 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3188 | { | |
3189 | struct ffs_dev *existing; | |
3190 | ||
da13a773 | 3191 | existing = _ffs_do_find_dev(name); |
4b187fce AP |
3192 | if (existing) |
3193 | return -EBUSY; | |
ab13cb0c | 3194 | |
4b187fce AP |
3195 | dev->name = name; |
3196 | ||
3197 | return 0; | |
3198 | } | |
3199 | ||
3200 | /* | |
3201 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3202 | */ | |
3203 | int ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3204 | { | |
3205 | int ret; | |
3206 | ||
3207 | ffs_dev_lock(); | |
3208 | ret = _ffs_name_dev(dev, name); | |
3209 | ffs_dev_unlock(); | |
3210 | ||
3211 | return ret; | |
3212 | } | |
0700faaf | 3213 | EXPORT_SYMBOL_GPL(ffs_name_dev); |
4b187fce AP |
3214 | |
3215 | int ffs_single_dev(struct ffs_dev *dev) | |
3216 | { | |
3217 | int ret; | |
3218 | ||
3219 | ret = 0; | |
3220 | ffs_dev_lock(); | |
3221 | ||
3222 | if (!list_is_singular(&ffs_devices)) | |
3223 | ret = -EBUSY; | |
3224 | else | |
3225 | dev->single = true; | |
3226 | ||
3227 | ffs_dev_unlock(); | |
3228 | return ret; | |
3229 | } | |
0700faaf | 3230 | EXPORT_SYMBOL_GPL(ffs_single_dev); |
4b187fce AP |
3231 | |
3232 | /* | |
3233 | * ffs_lock must be taken by the caller of this function | |
3234 | */ | |
da13a773 | 3235 | static void _ffs_free_dev(struct ffs_dev *dev) |
4b187fce AP |
3236 | { |
3237 | list_del(&dev->entry); | |
b658499f AP |
3238 | if (dev->name_allocated) |
3239 | kfree(dev->name); | |
4b187fce AP |
3240 | kfree(dev); |
3241 | if (list_empty(&ffs_devices)) | |
3242 | functionfs_cleanup(); | |
3243 | } | |
3244 | ||
3245 | static void *ffs_acquire_dev(const char *dev_name) | |
3246 | { | |
3247 | struct ffs_dev *ffs_dev; | |
3248 | ||
3249 | ENTER(); | |
3250 | ffs_dev_lock(); | |
3251 | ||
da13a773 | 3252 | ffs_dev = _ffs_find_dev(dev_name); |
4b187fce | 3253 | if (!ffs_dev) |
d668b4f3 | 3254 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3255 | else if (ffs_dev->mounted) |
3256 | ffs_dev = ERR_PTR(-EBUSY); | |
5920cda6 AP |
3257 | else if (ffs_dev->ffs_acquire_dev_callback && |
3258 | ffs_dev->ffs_acquire_dev_callback(ffs_dev)) | |
d668b4f3 | 3259 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3260 | else |
3261 | ffs_dev->mounted = true; | |
3262 | ||
3263 | ffs_dev_unlock(); | |
3264 | return ffs_dev; | |
3265 | } | |
3266 | ||
3267 | static void ffs_release_dev(struct ffs_data *ffs_data) | |
3268 | { | |
3269 | struct ffs_dev *ffs_dev; | |
3270 | ||
3271 | ENTER(); | |
3272 | ffs_dev_lock(); | |
3273 | ||
3274 | ffs_dev = ffs_data->private_data; | |
ea365922 | 3275 | if (ffs_dev) { |
4b187fce | 3276 | ffs_dev->mounted = false; |
ea365922 AP |
3277 | |
3278 | if (ffs_dev->ffs_release_dev_callback) | |
3279 | ffs_dev->ffs_release_dev_callback(ffs_dev); | |
3280 | } | |
4b187fce AP |
3281 | |
3282 | ffs_dev_unlock(); | |
3283 | } | |
3284 | ||
3285 | static int ffs_ready(struct ffs_data *ffs) | |
3286 | { | |
3287 | struct ffs_dev *ffs_obj; | |
3288 | int ret = 0; | |
3289 | ||
3290 | ENTER(); | |
3291 | ffs_dev_lock(); | |
3292 | ||
3293 | ffs_obj = ffs->private_data; | |
3294 | if (!ffs_obj) { | |
3295 | ret = -EINVAL; | |
3296 | goto done; | |
3297 | } | |
3298 | if (WARN_ON(ffs_obj->desc_ready)) { | |
3299 | ret = -EBUSY; | |
3300 | goto done; | |
3301 | } | |
3302 | ||
3303 | ffs_obj->desc_ready = true; | |
3304 | ffs_obj->ffs_data = ffs; | |
3305 | ||
3306 | if (ffs_obj->ffs_ready_callback) | |
3307 | ret = ffs_obj->ffs_ready_callback(ffs); | |
3308 | ||
3309 | done: | |
3310 | ffs_dev_unlock(); | |
3311 | return ret; | |
3312 | } | |
3313 | ||
3314 | static void ffs_closed(struct ffs_data *ffs) | |
3315 | { | |
3316 | struct ffs_dev *ffs_obj; | |
3317 | ||
3318 | ENTER(); | |
3319 | ffs_dev_lock(); | |
3320 | ||
3321 | ffs_obj = ffs->private_data; | |
3322 | if (!ffs_obj) | |
3323 | goto done; | |
3324 | ||
3325 | ffs_obj->desc_ready = false; | |
3326 | ||
3327 | if (ffs_obj->ffs_closed_callback) | |
3328 | ffs_obj->ffs_closed_callback(ffs); | |
b658499f AP |
3329 | |
3330 | if (!ffs_obj->opts || ffs_obj->opts->no_configfs | |
3331 | || !ffs_obj->opts->func_inst.group.cg_item.ci_parent) | |
3332 | goto done; | |
3333 | ||
3334 | unregister_gadget_item(ffs_obj->opts-> | |
3335 | func_inst.group.cg_item.ci_parent->ci_parent); | |
4b187fce AP |
3336 | done: |
3337 | ffs_dev_unlock(); | |
3338 | } | |
3339 | ||
ddf8abd2 MN |
3340 | /* Misc helper functions ****************************************************/ |
3341 | ||
3342 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
3343 | { | |
3344 | return nonblock | |
3345 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN | |
3346 | : mutex_lock_interruptible(mutex); | |
3347 | } | |
3348 | ||
260ef311 | 3349 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
3350 | { |
3351 | char *data; | |
3352 | ||
3353 | if (unlikely(!len)) | |
3354 | return NULL; | |
3355 | ||
3356 | data = kmalloc(len, GFP_KERNEL); | |
3357 | if (unlikely(!data)) | |
3358 | return ERR_PTR(-ENOMEM); | |
3359 | ||
3360 | if (unlikely(__copy_from_user(data, buf, len))) { | |
3361 | kfree(data); | |
3362 | return ERR_PTR(-EFAULT); | |
3363 | } | |
3364 | ||
aa02f172 | 3365 | pr_vdebug("Buffer from user space:\n"); |
ddf8abd2 MN |
3366 | ffs_dump_mem("", data, len); |
3367 | ||
3368 | return data; | |
3369 | } | |
5920cda6 | 3370 | |
5920cda6 AP |
3371 | DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc); |
3372 | MODULE_LICENSE("GPL"); | |
3373 | MODULE_AUTHOR("Michal Nazarewicz"); |