]>
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 | ||
6d5c1c77 RB |
158 | struct ffs_desc_helper { |
159 | struct ffs_data *ffs; | |
160 | unsigned interfaces_count; | |
161 | unsigned eps_count; | |
162 | }; | |
163 | ||
ddf8abd2 MN |
164 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
165 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); | |
166 | ||
167 | static struct inode *__must_check | |
168 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, | |
169 | const struct file_operations *fops, | |
170 | struct dentry **dentry_p); | |
171 | ||
4b187fce AP |
172 | /* Devices management *******************************************************/ |
173 | ||
174 | DEFINE_MUTEX(ffs_lock); | |
0700faaf | 175 | EXPORT_SYMBOL_GPL(ffs_lock); |
4b187fce | 176 | |
da13a773 AP |
177 | static struct ffs_dev *_ffs_find_dev(const char *name); |
178 | static struct ffs_dev *_ffs_alloc_dev(void); | |
b658499f | 179 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name); |
da13a773 | 180 | static void _ffs_free_dev(struct ffs_dev *dev); |
4b187fce AP |
181 | static void *ffs_acquire_dev(const char *dev_name); |
182 | static void ffs_release_dev(struct ffs_data *ffs_data); | |
183 | static int ffs_ready(struct ffs_data *ffs); | |
184 | static void ffs_closed(struct ffs_data *ffs); | |
ddf8abd2 MN |
185 | |
186 | /* Misc helper functions ****************************************************/ | |
187 | ||
188 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
189 | __attribute__((warn_unused_result, nonnull)); | |
260ef311 | 190 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
191 | __attribute__((warn_unused_result, nonnull)); |
192 | ||
193 | ||
194 | /* Control file aka ep0 *****************************************************/ | |
195 | ||
196 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
197 | { | |
198 | struct ffs_data *ffs = req->context; | |
199 | ||
200 | complete_all(&ffs->ep0req_completion); | |
201 | } | |
202 | ||
ddf8abd2 MN |
203 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
204 | { | |
205 | struct usb_request *req = ffs->ep0req; | |
206 | int ret; | |
207 | ||
208 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); | |
209 | ||
210 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
211 | ||
212 | req->buf = data; | |
213 | req->length = len; | |
214 | ||
ce1fd358 MS |
215 | /* |
216 | * UDC layer requires to provide a buffer even for ZLP, but should | |
217 | * not use it at all. Let's provide some poisoned pointer to catch | |
218 | * possible bug in the driver. | |
219 | */ | |
220 | if (req->buf == NULL) | |
221 | req->buf = (void *)0xDEADBABE; | |
222 | ||
16735d02 | 223 | reinit_completion(&ffs->ep0req_completion); |
ddf8abd2 MN |
224 | |
225 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); | |
226 | if (unlikely(ret < 0)) | |
227 | return ret; | |
228 | ||
229 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); | |
230 | if (unlikely(ret)) { | |
231 | usb_ep_dequeue(ffs->gadget->ep0, req); | |
232 | return -EINTR; | |
233 | } | |
234 | ||
235 | ffs->setup_state = FFS_NO_SETUP; | |
0a7b1f8a | 236 | return req->status ? req->status : req->actual; |
ddf8abd2 MN |
237 | } |
238 | ||
239 | static int __ffs_ep0_stall(struct ffs_data *ffs) | |
240 | { | |
241 | if (ffs->ev.can_stall) { | |
aa02f172 | 242 | pr_vdebug("ep0 stall\n"); |
ddf8abd2 MN |
243 | usb_ep_set_halt(ffs->gadget->ep0); |
244 | ffs->setup_state = FFS_NO_SETUP; | |
245 | return -EL2HLT; | |
246 | } else { | |
aa02f172 | 247 | pr_debug("bogus ep0 stall!\n"); |
ddf8abd2 MN |
248 | return -ESRCH; |
249 | } | |
250 | } | |
251 | ||
ddf8abd2 MN |
252 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
253 | size_t len, loff_t *ptr) | |
254 | { | |
255 | struct ffs_data *ffs = file->private_data; | |
256 | ssize_t ret; | |
257 | char *data; | |
258 | ||
259 | ENTER(); | |
260 | ||
261 | /* Fast check if setup was canceled */ | |
a7ecf054 | 262 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
263 | return -EIDRM; |
264 | ||
265 | /* Acquire mutex */ | |
266 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
267 | if (unlikely(ret < 0)) | |
268 | return ret; | |
269 | ||
ddf8abd2 MN |
270 | /* Check state */ |
271 | switch (ffs->state) { | |
272 | case FFS_READ_DESCRIPTORS: | |
273 | case FFS_READ_STRINGS: | |
274 | /* Copy data */ | |
275 | if (unlikely(len < 16)) { | |
276 | ret = -EINVAL; | |
277 | break; | |
278 | } | |
279 | ||
280 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 281 | if (IS_ERR(data)) { |
ddf8abd2 MN |
282 | ret = PTR_ERR(data); |
283 | break; | |
284 | } | |
285 | ||
286 | /* Handle data */ | |
287 | if (ffs->state == FFS_READ_DESCRIPTORS) { | |
aa02f172 | 288 | pr_info("read descriptors\n"); |
ddf8abd2 MN |
289 | ret = __ffs_data_got_descs(ffs, data, len); |
290 | if (unlikely(ret < 0)) | |
291 | break; | |
292 | ||
293 | ffs->state = FFS_READ_STRINGS; | |
294 | ret = len; | |
295 | } else { | |
aa02f172 | 296 | pr_info("read strings\n"); |
ddf8abd2 MN |
297 | ret = __ffs_data_got_strings(ffs, data, len); |
298 | if (unlikely(ret < 0)) | |
299 | break; | |
300 | ||
301 | ret = ffs_epfiles_create(ffs); | |
302 | if (unlikely(ret)) { | |
303 | ffs->state = FFS_CLOSING; | |
304 | break; | |
305 | } | |
306 | ||
307 | ffs->state = FFS_ACTIVE; | |
308 | mutex_unlock(&ffs->mutex); | |
309 | ||
4b187fce | 310 | ret = ffs_ready(ffs); |
ddf8abd2 MN |
311 | if (unlikely(ret < 0)) { |
312 | ffs->state = FFS_CLOSING; | |
313 | return ret; | |
314 | } | |
315 | ||
316 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); | |
317 | return len; | |
318 | } | |
319 | break; | |
320 | ||
ddf8abd2 MN |
321 | case FFS_ACTIVE: |
322 | data = NULL; | |
5ab54cf7 MN |
323 | /* |
324 | * We're called from user space, we can use _irq | |
325 | * rather then _irqsave | |
326 | */ | |
ddf8abd2 | 327 | spin_lock_irq(&ffs->ev.waitq.lock); |
a7ecf054 | 328 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 329 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
330 | ret = -EIDRM; |
331 | goto done_spin; | |
332 | ||
333 | case FFS_NO_SETUP: | |
334 | ret = -ESRCH; | |
335 | goto done_spin; | |
336 | ||
337 | case FFS_SETUP_PENDING: | |
338 | break; | |
339 | } | |
340 | ||
341 | /* FFS_SETUP_PENDING */ | |
342 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { | |
343 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
344 | ret = __ffs_ep0_stall(ffs); | |
345 | break; | |
346 | } | |
347 | ||
348 | /* FFS_SETUP_PENDING and not stall */ | |
349 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
350 | ||
351 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
352 | ||
353 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 354 | if (IS_ERR(data)) { |
ddf8abd2 MN |
355 | ret = PTR_ERR(data); |
356 | break; | |
357 | } | |
358 | ||
359 | spin_lock_irq(&ffs->ev.waitq.lock); | |
360 | ||
5ab54cf7 MN |
361 | /* |
362 | * We are guaranteed to be still in FFS_ACTIVE state | |
ddf8abd2 | 363 | * but the state of setup could have changed from |
e46318a0 | 364 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELLED so we need |
ddf8abd2 | 365 | * to check for that. If that happened we copied data |
5ab54cf7 MN |
366 | * from user space in vain but it's unlikely. |
367 | * | |
368 | * For sure we are not in FFS_NO_SETUP since this is | |
ddf8abd2 MN |
369 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
370 | * transition can be performed and it's protected by | |
5ab54cf7 MN |
371 | * mutex. |
372 | */ | |
a7ecf054 MN |
373 | if (ffs_setup_state_clear_cancelled(ffs) == |
374 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
375 | ret = -EIDRM; |
376 | done_spin: | |
377 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
378 | } else { | |
379 | /* unlocks spinlock */ | |
380 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
381 | } | |
382 | kfree(data); | |
383 | break; | |
384 | ||
ddf8abd2 MN |
385 | default: |
386 | ret = -EBADFD; | |
387 | break; | |
388 | } | |
389 | ||
ddf8abd2 MN |
390 | mutex_unlock(&ffs->mutex); |
391 | return ret; | |
392 | } | |
393 | ||
ddf8abd2 MN |
394 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, |
395 | size_t n) | |
396 | { | |
5ab54cf7 MN |
397 | /* |
398 | * We are holding ffs->ev.waitq.lock and ffs->mutex and we need | |
399 | * to release them. | |
400 | */ | |
ddf8abd2 MN |
401 | struct usb_functionfs_event events[n]; |
402 | unsigned i = 0; | |
403 | ||
404 | memset(events, 0, sizeof events); | |
405 | ||
406 | do { | |
407 | events[i].type = ffs->ev.types[i]; | |
408 | if (events[i].type == FUNCTIONFS_SETUP) { | |
409 | events[i].u.setup = ffs->ev.setup; | |
410 | ffs->setup_state = FFS_SETUP_PENDING; | |
411 | } | |
412 | } while (++i < n); | |
413 | ||
414 | if (n < ffs->ev.count) { | |
415 | ffs->ev.count -= n; | |
416 | memmove(ffs->ev.types, ffs->ev.types + n, | |
417 | ffs->ev.count * sizeof *ffs->ev.types); | |
418 | } else { | |
419 | ffs->ev.count = 0; | |
420 | } | |
421 | ||
422 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
423 | mutex_unlock(&ffs->mutex); | |
424 | ||
425 | return unlikely(__copy_to_user(buf, events, sizeof events)) | |
426 | ? -EFAULT : sizeof events; | |
427 | } | |
428 | ||
ddf8abd2 MN |
429 | static ssize_t ffs_ep0_read(struct file *file, char __user *buf, |
430 | size_t len, loff_t *ptr) | |
431 | { | |
432 | struct ffs_data *ffs = file->private_data; | |
433 | char *data = NULL; | |
434 | size_t n; | |
435 | int ret; | |
436 | ||
437 | ENTER(); | |
438 | ||
439 | /* Fast check if setup was canceled */ | |
a7ecf054 | 440 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
441 | return -EIDRM; |
442 | ||
443 | /* Acquire mutex */ | |
444 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
445 | if (unlikely(ret < 0)) | |
446 | return ret; | |
447 | ||
ddf8abd2 MN |
448 | /* Check state */ |
449 | if (ffs->state != FFS_ACTIVE) { | |
450 | ret = -EBADFD; | |
451 | goto done_mutex; | |
452 | } | |
453 | ||
5ab54cf7 MN |
454 | /* |
455 | * We're called from user space, we can use _irq rather then | |
456 | * _irqsave | |
457 | */ | |
ddf8abd2 MN |
458 | spin_lock_irq(&ffs->ev.waitq.lock); |
459 | ||
a7ecf054 | 460 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 461 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
462 | ret = -EIDRM; |
463 | break; | |
464 | ||
465 | case FFS_NO_SETUP: | |
466 | n = len / sizeof(struct usb_functionfs_event); | |
467 | if (unlikely(!n)) { | |
468 | ret = -EINVAL; | |
469 | break; | |
470 | } | |
471 | ||
472 | if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { | |
473 | ret = -EAGAIN; | |
474 | break; | |
475 | } | |
476 | ||
5ab54cf7 MN |
477 | if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, |
478 | ffs->ev.count)) { | |
ddf8abd2 MN |
479 | ret = -EINTR; |
480 | break; | |
481 | } | |
482 | ||
483 | return __ffs_ep0_read_events(ffs, buf, | |
484 | min(n, (size_t)ffs->ev.count)); | |
485 | ||
ddf8abd2 MN |
486 | case FFS_SETUP_PENDING: |
487 | if (ffs->ev.setup.bRequestType & USB_DIR_IN) { | |
488 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
489 | ret = __ffs_ep0_stall(ffs); | |
490 | goto done_mutex; | |
491 | } | |
492 | ||
493 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
494 | ||
495 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
496 | ||
497 | if (likely(len)) { | |
498 | data = kmalloc(len, GFP_KERNEL); | |
499 | if (unlikely(!data)) { | |
500 | ret = -ENOMEM; | |
501 | goto done_mutex; | |
502 | } | |
503 | } | |
504 | ||
505 | spin_lock_irq(&ffs->ev.waitq.lock); | |
506 | ||
507 | /* See ffs_ep0_write() */ | |
a7ecf054 MN |
508 | if (ffs_setup_state_clear_cancelled(ffs) == |
509 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
510 | ret = -EIDRM; |
511 | break; | |
512 | } | |
513 | ||
514 | /* unlocks spinlock */ | |
515 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
516 | if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len))) | |
517 | ret = -EFAULT; | |
518 | goto done_mutex; | |
519 | ||
520 | default: | |
521 | ret = -EBADFD; | |
522 | break; | |
523 | } | |
524 | ||
525 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
526 | done_mutex: | |
527 | mutex_unlock(&ffs->mutex); | |
528 | kfree(data); | |
529 | return ret; | |
530 | } | |
531 | ||
ddf8abd2 MN |
532 | static int ffs_ep0_open(struct inode *inode, struct file *file) |
533 | { | |
534 | struct ffs_data *ffs = inode->i_private; | |
535 | ||
536 | ENTER(); | |
537 | ||
538 | if (unlikely(ffs->state == FFS_CLOSING)) | |
539 | return -EBUSY; | |
540 | ||
541 | file->private_data = ffs; | |
542 | ffs_data_opened(ffs); | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
ddf8abd2 MN |
547 | static int ffs_ep0_release(struct inode *inode, struct file *file) |
548 | { | |
549 | struct ffs_data *ffs = file->private_data; | |
550 | ||
551 | ENTER(); | |
552 | ||
553 | ffs_data_closed(ffs); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
ddf8abd2 MN |
558 | static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) |
559 | { | |
560 | struct ffs_data *ffs = file->private_data; | |
561 | struct usb_gadget *gadget = ffs->gadget; | |
562 | long ret; | |
563 | ||
564 | ENTER(); | |
565 | ||
566 | if (code == FUNCTIONFS_INTERFACE_REVMAP) { | |
567 | struct ffs_function *func = ffs->func; | |
568 | ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; | |
92b0abf8 | 569 | } else if (gadget && gadget->ops->ioctl) { |
ddf8abd2 | 570 | ret = gadget->ops->ioctl(gadget, code, value); |
ddf8abd2 MN |
571 | } else { |
572 | ret = -ENOTTY; | |
573 | } | |
574 | ||
575 | return ret; | |
576 | } | |
577 | ||
23de91e9 RB |
578 | static unsigned int ffs_ep0_poll(struct file *file, poll_table *wait) |
579 | { | |
580 | struct ffs_data *ffs = file->private_data; | |
581 | unsigned int mask = POLLWRNORM; | |
582 | int ret; | |
583 | ||
584 | poll_wait(file, &ffs->ev.waitq, wait); | |
585 | ||
586 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
587 | if (unlikely(ret < 0)) | |
588 | return mask; | |
589 | ||
590 | switch (ffs->state) { | |
591 | case FFS_READ_DESCRIPTORS: | |
592 | case FFS_READ_STRINGS: | |
593 | mask |= POLLOUT; | |
594 | break; | |
595 | ||
596 | case FFS_ACTIVE: | |
597 | switch (ffs->setup_state) { | |
598 | case FFS_NO_SETUP: | |
599 | if (ffs->ev.count) | |
600 | mask |= POLLIN; | |
601 | break; | |
602 | ||
603 | case FFS_SETUP_PENDING: | |
604 | case FFS_SETUP_CANCELLED: | |
605 | mask |= (POLLIN | POLLOUT); | |
606 | break; | |
607 | } | |
608 | case FFS_CLOSING: | |
609 | break; | |
610 | } | |
611 | ||
612 | mutex_unlock(&ffs->mutex); | |
613 | ||
614 | return mask; | |
615 | } | |
616 | ||
ddf8abd2 | 617 | static const struct file_operations ffs_ep0_operations = { |
ddf8abd2 MN |
618 | .llseek = no_llseek, |
619 | ||
620 | .open = ffs_ep0_open, | |
621 | .write = ffs_ep0_write, | |
622 | .read = ffs_ep0_read, | |
623 | .release = ffs_ep0_release, | |
624 | .unlocked_ioctl = ffs_ep0_ioctl, | |
23de91e9 | 625 | .poll = ffs_ep0_poll, |
ddf8abd2 MN |
626 | }; |
627 | ||
628 | ||
629 | /* "Normal" endpoints operations ********************************************/ | |
630 | ||
ddf8abd2 MN |
631 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) |
632 | { | |
633 | ENTER(); | |
634 | if (likely(req->context)) { | |
635 | struct ffs_ep *ep = _ep->driver_data; | |
636 | ep->status = req->status ? req->status : req->actual; | |
637 | complete(req->context); | |
638 | } | |
639 | } | |
640 | ||
2e4c7553 RB |
641 | static void ffs_user_copy_worker(struct work_struct *work) |
642 | { | |
643 | struct ffs_io_data *io_data = container_of(work, struct ffs_io_data, | |
644 | work); | |
645 | int ret = io_data->req->status ? io_data->req->status : | |
646 | io_data->req->actual; | |
647 | ||
648 | if (io_data->read && ret > 0) { | |
649 | int i; | |
650 | size_t pos = 0; | |
651 | use_mm(io_data->mm); | |
652 | for (i = 0; i < io_data->nr_segs; i++) { | |
653 | if (unlikely(copy_to_user(io_data->iovec[i].iov_base, | |
654 | &io_data->buf[pos], | |
655 | io_data->iovec[i].iov_len))) { | |
656 | ret = -EFAULT; | |
657 | break; | |
658 | } | |
659 | pos += io_data->iovec[i].iov_len; | |
660 | } | |
661 | unuse_mm(io_data->mm); | |
662 | } | |
663 | ||
664 | aio_complete(io_data->kiocb, ret, ret); | |
665 | ||
666 | usb_ep_free_request(io_data->ep, io_data->req); | |
667 | ||
668 | io_data->kiocb->private = NULL; | |
669 | if (io_data->read) | |
670 | kfree(io_data->iovec); | |
671 | kfree(io_data->buf); | |
672 | kfree(io_data); | |
673 | } | |
674 | ||
675 | static void ffs_epfile_async_io_complete(struct usb_ep *_ep, | |
676 | struct usb_request *req) | |
677 | { | |
678 | struct ffs_io_data *io_data = req->context; | |
679 | ||
680 | ENTER(); | |
681 | ||
682 | INIT_WORK(&io_data->work, ffs_user_copy_worker); | |
683 | schedule_work(&io_data->work); | |
684 | } | |
685 | ||
686 | static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data) | |
ddf8abd2 MN |
687 | { |
688 | struct ffs_epfile *epfile = file->private_data; | |
689 | struct ffs_ep *ep; | |
690 | char *data = NULL; | |
219580e6 | 691 | ssize_t ret, data_len; |
ddf8abd2 MN |
692 | int halt; |
693 | ||
7fa68034 MN |
694 | /* Are we still active? */ |
695 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) { | |
696 | ret = -ENODEV; | |
697 | goto error; | |
698 | } | |
ddf8abd2 | 699 | |
7fa68034 MN |
700 | /* Wait for endpoint to be enabled */ |
701 | ep = epfile->ep; | |
702 | if (!ep) { | |
703 | if (file->f_flags & O_NONBLOCK) { | |
704 | ret = -EAGAIN; | |
ddf8abd2 MN |
705 | goto error; |
706 | } | |
707 | ||
7fa68034 MN |
708 | ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep)); |
709 | if (ret) { | |
710 | ret = -EINTR; | |
ddf8abd2 MN |
711 | goto error; |
712 | } | |
7fa68034 | 713 | } |
ddf8abd2 | 714 | |
7fa68034 | 715 | /* Do we halt? */ |
2e4c7553 | 716 | halt = (!io_data->read == !epfile->in); |
7fa68034 MN |
717 | if (halt && epfile->isoc) { |
718 | ret = -EINVAL; | |
719 | goto error; | |
720 | } | |
ddf8abd2 | 721 | |
7fa68034 MN |
722 | /* Allocate & copy */ |
723 | if (!halt) { | |
f0f42204 AP |
724 | /* |
725 | * if we _do_ wait above, the epfile->ffs->gadget might be NULL | |
726 | * before the waiting completes, so do not assign to 'gadget' earlier | |
727 | */ | |
728 | struct usb_gadget *gadget = epfile->ffs->gadget; | |
729 | ||
97839ca4 CB |
730 | spin_lock_irq(&epfile->ffs->eps_lock); |
731 | /* In the meantime, endpoint got disabled or changed. */ | |
732 | if (epfile->ep != ep) { | |
733 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
734 | return -ESHUTDOWN; | |
735 | } | |
219580e6 MN |
736 | /* |
737 | * Controller may require buffer size to be aligned to | |
738 | * maxpacketsize of an out endpoint. | |
739 | */ | |
2e4c7553 RB |
740 | data_len = io_data->read ? |
741 | usb_ep_align_maybe(gadget, ep->ep, io_data->len) : | |
742 | io_data->len; | |
97839ca4 | 743 | spin_unlock_irq(&epfile->ffs->eps_lock); |
219580e6 MN |
744 | |
745 | data = kmalloc(data_len, GFP_KERNEL); | |
7fa68034 MN |
746 | if (unlikely(!data)) |
747 | return -ENOMEM; | |
2e4c7553 RB |
748 | if (io_data->aio && !io_data->read) { |
749 | int i; | |
750 | size_t pos = 0; | |
751 | for (i = 0; i < io_data->nr_segs; i++) { | |
752 | if (unlikely(copy_from_user(&data[pos], | |
753 | io_data->iovec[i].iov_base, | |
754 | io_data->iovec[i].iov_len))) { | |
755 | ret = -EFAULT; | |
756 | goto error; | |
757 | } | |
758 | pos += io_data->iovec[i].iov_len; | |
759 | } | |
760 | } else { | |
761 | if (!io_data->read && | |
762 | unlikely(__copy_from_user(data, io_data->buf, | |
763 | io_data->len))) { | |
764 | ret = -EFAULT; | |
765 | goto error; | |
766 | } | |
7fa68034 MN |
767 | } |
768 | } | |
ddf8abd2 | 769 | |
7fa68034 MN |
770 | /* We will be using request */ |
771 | ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); | |
772 | if (unlikely(ret)) | |
773 | goto error; | |
ddf8abd2 | 774 | |
7fa68034 | 775 | spin_lock_irq(&epfile->ffs->eps_lock); |
ddf8abd2 | 776 | |
7fa68034 MN |
777 | if (epfile->ep != ep) { |
778 | /* In the meantime, endpoint got disabled or changed. */ | |
779 | ret = -ESHUTDOWN; | |
780 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
781 | } else if (halt) { | |
782 | /* Halt */ | |
ddf8abd2 MN |
783 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) |
784 | usb_ep_set_halt(ep->ep); | |
785 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
786 | ret = -EBADMSG; | |
787 | } else { | |
788 | /* Fire the request */ | |
2e4c7553 | 789 | struct usb_request *req; |
ddf8abd2 | 790 | |
2e4c7553 RB |
791 | if (io_data->aio) { |
792 | req = usb_ep_alloc_request(ep->ep, GFP_KERNEL); | |
793 | if (unlikely(!req)) | |
48968f8d | 794 | goto error_lock; |
ddf8abd2 | 795 | |
2e4c7553 RB |
796 | req->buf = data; |
797 | req->length = io_data->len; | |
ddf8abd2 | 798 | |
2e4c7553 RB |
799 | io_data->buf = data; |
800 | io_data->ep = ep->ep; | |
801 | io_data->req = req; | |
ddf8abd2 | 802 | |
2e4c7553 RB |
803 | req->context = io_data; |
804 | req->complete = ffs_epfile_async_io_complete; | |
805 | ||
806 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); | |
807 | if (unlikely(ret)) { | |
808 | usb_ep_free_request(ep->ep, req); | |
48968f8d | 809 | goto error_lock; |
2e4c7553 RB |
810 | } |
811 | ret = -EIOCBQUEUED; | |
812 | ||
813 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
ddf8abd2 | 814 | } else { |
2e4c7553 RB |
815 | DECLARE_COMPLETION_ONSTACK(done); |
816 | ||
817 | req = ep->req; | |
818 | req->buf = data; | |
819 | req->length = io_data->len; | |
820 | ||
821 | req->context = &done; | |
822 | req->complete = ffs_epfile_io_complete; | |
823 | ||
824 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); | |
825 | ||
826 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
827 | ||
828 | if (unlikely(ret < 0)) { | |
829 | /* nop */ | |
830 | } else if (unlikely( | |
831 | wait_for_completion_interruptible(&done))) { | |
832 | ret = -EINTR; | |
833 | usb_ep_dequeue(ep->ep, req); | |
834 | } else { | |
cfe919b5 CL |
835 | /* |
836 | * XXX We may end up silently droping data | |
837 | * here. Since data_len (i.e. req->length) may | |
838 | * be bigger than len (after being rounded up | |
839 | * to maxpacketsize), we may end up with more | |
840 | * data then user space has space for. | |
841 | */ | |
842 | ret = ep->status; | |
843 | if (io_data->read && ret > 0) { | |
844 | ret = min_t(size_t, ret, io_data->len); | |
845 | ||
846 | if (unlikely(copy_to_user(io_data->buf, | |
847 | data, ret))) | |
848 | ret = -EFAULT; | |
849 | } | |
2e4c7553 RB |
850 | } |
851 | kfree(data); | |
ddf8abd2 MN |
852 | } |
853 | } | |
854 | ||
855 | mutex_unlock(&epfile->mutex); | |
2e4c7553 | 856 | return ret; |
48968f8d RB |
857 | |
858 | error_lock: | |
859 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
860 | mutex_unlock(&epfile->mutex); | |
ddf8abd2 MN |
861 | error: |
862 | kfree(data); | |
863 | return ret; | |
864 | } | |
865 | ||
ddf8abd2 MN |
866 | static ssize_t |
867 | ffs_epfile_write(struct file *file, const char __user *buf, size_t len, | |
868 | loff_t *ptr) | |
869 | { | |
2e4c7553 RB |
870 | struct ffs_io_data io_data; |
871 | ||
ddf8abd2 MN |
872 | ENTER(); |
873 | ||
2e4c7553 RB |
874 | io_data.aio = false; |
875 | io_data.read = false; | |
876 | io_data.buf = (char * __user)buf; | |
877 | io_data.len = len; | |
878 | ||
879 | return ffs_epfile_io(file, &io_data); | |
ddf8abd2 MN |
880 | } |
881 | ||
882 | static ssize_t | |
883 | ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr) | |
884 | { | |
2e4c7553 RB |
885 | struct ffs_io_data io_data; |
886 | ||
ddf8abd2 MN |
887 | ENTER(); |
888 | ||
2e4c7553 RB |
889 | io_data.aio = false; |
890 | io_data.read = true; | |
891 | io_data.buf = buf; | |
892 | io_data.len = len; | |
893 | ||
894 | return ffs_epfile_io(file, &io_data); | |
ddf8abd2 MN |
895 | } |
896 | ||
897 | static int | |
898 | ffs_epfile_open(struct inode *inode, struct file *file) | |
899 | { | |
900 | struct ffs_epfile *epfile = inode->i_private; | |
901 | ||
902 | ENTER(); | |
903 | ||
904 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
905 | return -ENODEV; | |
906 | ||
907 | file->private_data = epfile; | |
908 | ffs_data_opened(epfile->ffs); | |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
2e4c7553 RB |
913 | static int ffs_aio_cancel(struct kiocb *kiocb) |
914 | { | |
915 | struct ffs_io_data *io_data = kiocb->private; | |
916 | struct ffs_epfile *epfile = kiocb->ki_filp->private_data; | |
917 | int value; | |
918 | ||
919 | ENTER(); | |
920 | ||
921 | spin_lock_irq(&epfile->ffs->eps_lock); | |
922 | ||
923 | if (likely(io_data && io_data->ep && io_data->req)) | |
924 | value = usb_ep_dequeue(io_data->ep, io_data->req); | |
925 | else | |
926 | value = -EINVAL; | |
927 | ||
928 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
929 | ||
930 | return value; | |
931 | } | |
932 | ||
933 | static ssize_t ffs_epfile_aio_write(struct kiocb *kiocb, | |
934 | const struct iovec *iovec, | |
935 | unsigned long nr_segs, loff_t loff) | |
936 | { | |
937 | struct ffs_io_data *io_data; | |
938 | ||
939 | ENTER(); | |
940 | ||
941 | io_data = kmalloc(sizeof(*io_data), GFP_KERNEL); | |
942 | if (unlikely(!io_data)) | |
943 | return -ENOMEM; | |
944 | ||
945 | io_data->aio = true; | |
946 | io_data->read = false; | |
947 | io_data->kiocb = kiocb; | |
948 | io_data->iovec = iovec; | |
949 | io_data->nr_segs = nr_segs; | |
950 | io_data->len = kiocb->ki_nbytes; | |
951 | io_data->mm = current->mm; | |
952 | ||
953 | kiocb->private = io_data; | |
954 | ||
955 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
956 | ||
957 | return ffs_epfile_io(kiocb->ki_filp, io_data); | |
958 | } | |
959 | ||
960 | static ssize_t ffs_epfile_aio_read(struct kiocb *kiocb, | |
961 | const struct iovec *iovec, | |
962 | unsigned long nr_segs, loff_t loff) | |
963 | { | |
964 | struct ffs_io_data *io_data; | |
965 | struct iovec *iovec_copy; | |
966 | ||
967 | ENTER(); | |
968 | ||
969 | iovec_copy = kmalloc_array(nr_segs, sizeof(*iovec_copy), GFP_KERNEL); | |
970 | if (unlikely(!iovec_copy)) | |
971 | return -ENOMEM; | |
972 | ||
973 | memcpy(iovec_copy, iovec, sizeof(struct iovec)*nr_segs); | |
974 | ||
975 | io_data = kmalloc(sizeof(*io_data), GFP_KERNEL); | |
976 | if (unlikely(!io_data)) { | |
977 | kfree(iovec_copy); | |
978 | return -ENOMEM; | |
979 | } | |
980 | ||
981 | io_data->aio = true; | |
982 | io_data->read = true; | |
983 | io_data->kiocb = kiocb; | |
984 | io_data->iovec = iovec_copy; | |
985 | io_data->nr_segs = nr_segs; | |
986 | io_data->len = kiocb->ki_nbytes; | |
987 | io_data->mm = current->mm; | |
988 | ||
989 | kiocb->private = io_data; | |
990 | ||
991 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
992 | ||
993 | return ffs_epfile_io(kiocb->ki_filp, io_data); | |
994 | } | |
995 | ||
ddf8abd2 MN |
996 | static int |
997 | ffs_epfile_release(struct inode *inode, struct file *file) | |
998 | { | |
999 | struct ffs_epfile *epfile = inode->i_private; | |
1000 | ||
1001 | ENTER(); | |
1002 | ||
1003 | ffs_data_closed(epfile->ffs); | |
1004 | ||
1005 | return 0; | |
1006 | } | |
1007 | ||
ddf8abd2 MN |
1008 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
1009 | unsigned long value) | |
1010 | { | |
1011 | struct ffs_epfile *epfile = file->private_data; | |
1012 | int ret; | |
1013 | ||
1014 | ENTER(); | |
1015 | ||
1016 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
1017 | return -ENODEV; | |
1018 | ||
1019 | spin_lock_irq(&epfile->ffs->eps_lock); | |
1020 | if (likely(epfile->ep)) { | |
1021 | switch (code) { | |
1022 | case FUNCTIONFS_FIFO_STATUS: | |
1023 | ret = usb_ep_fifo_status(epfile->ep->ep); | |
1024 | break; | |
1025 | case FUNCTIONFS_FIFO_FLUSH: | |
1026 | usb_ep_fifo_flush(epfile->ep->ep); | |
1027 | ret = 0; | |
1028 | break; | |
1029 | case FUNCTIONFS_CLEAR_HALT: | |
1030 | ret = usb_ep_clear_halt(epfile->ep->ep); | |
1031 | break; | |
1032 | case FUNCTIONFS_ENDPOINT_REVMAP: | |
1033 | ret = epfile->ep->num; | |
1034 | break; | |
c559a353 RB |
1035 | case FUNCTIONFS_ENDPOINT_DESC: |
1036 | { | |
1037 | int desc_idx; | |
1038 | struct usb_endpoint_descriptor *desc; | |
1039 | ||
1040 | switch (epfile->ffs->gadget->speed) { | |
1041 | case USB_SPEED_SUPER: | |
1042 | desc_idx = 2; | |
1043 | break; | |
1044 | case USB_SPEED_HIGH: | |
1045 | desc_idx = 1; | |
1046 | break; | |
1047 | default: | |
1048 | desc_idx = 0; | |
1049 | } | |
1050 | desc = epfile->ep->descs[desc_idx]; | |
1051 | ||
1052 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1053 | ret = copy_to_user((void *)value, desc, sizeof(*desc)); | |
1054 | if (ret) | |
1055 | ret = -EFAULT; | |
1056 | return ret; | |
1057 | } | |
ddf8abd2 MN |
1058 | default: |
1059 | ret = -ENOTTY; | |
1060 | } | |
1061 | } else { | |
1062 | ret = -ENODEV; | |
1063 | } | |
1064 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1065 | ||
1066 | return ret; | |
1067 | } | |
1068 | ||
ddf8abd2 | 1069 | static const struct file_operations ffs_epfile_operations = { |
ddf8abd2 MN |
1070 | .llseek = no_llseek, |
1071 | ||
1072 | .open = ffs_epfile_open, | |
1073 | .write = ffs_epfile_write, | |
1074 | .read = ffs_epfile_read, | |
2e4c7553 RB |
1075 | .aio_write = ffs_epfile_aio_write, |
1076 | .aio_read = ffs_epfile_aio_read, | |
ddf8abd2 MN |
1077 | .release = ffs_epfile_release, |
1078 | .unlocked_ioctl = ffs_epfile_ioctl, | |
1079 | }; | |
1080 | ||
1081 | ||
ddf8abd2 MN |
1082 | /* File system and super block operations ***********************************/ |
1083 | ||
1084 | /* | |
5ab54cf7 | 1085 | * Mounting the file system creates a controller file, used first for |
ddf8abd2 MN |
1086 | * function configuration then later for event monitoring. |
1087 | */ | |
1088 | ||
ddf8abd2 MN |
1089 | static struct inode *__must_check |
1090 | ffs_sb_make_inode(struct super_block *sb, void *data, | |
1091 | const struct file_operations *fops, | |
1092 | const struct inode_operations *iops, | |
1093 | struct ffs_file_perms *perms) | |
1094 | { | |
1095 | struct inode *inode; | |
1096 | ||
1097 | ENTER(); | |
1098 | ||
1099 | inode = new_inode(sb); | |
1100 | ||
1101 | if (likely(inode)) { | |
1102 | struct timespec current_time = CURRENT_TIME; | |
1103 | ||
12ba8d1e | 1104 | inode->i_ino = get_next_ino(); |
ddf8abd2 MN |
1105 | inode->i_mode = perms->mode; |
1106 | inode->i_uid = perms->uid; | |
1107 | inode->i_gid = perms->gid; | |
1108 | inode->i_atime = current_time; | |
1109 | inode->i_mtime = current_time; | |
1110 | inode->i_ctime = current_time; | |
1111 | inode->i_private = data; | |
1112 | if (fops) | |
1113 | inode->i_fop = fops; | |
1114 | if (iops) | |
1115 | inode->i_op = iops; | |
1116 | } | |
1117 | ||
1118 | return inode; | |
1119 | } | |
1120 | ||
ddf8abd2 | 1121 | /* Create "regular" file */ |
ddf8abd2 MN |
1122 | static struct inode *ffs_sb_create_file(struct super_block *sb, |
1123 | const char *name, void *data, | |
1124 | const struct file_operations *fops, | |
1125 | struct dentry **dentry_p) | |
1126 | { | |
1127 | struct ffs_data *ffs = sb->s_fs_info; | |
1128 | struct dentry *dentry; | |
1129 | struct inode *inode; | |
1130 | ||
1131 | ENTER(); | |
1132 | ||
1133 | dentry = d_alloc_name(sb->s_root, name); | |
1134 | if (unlikely(!dentry)) | |
1135 | return NULL; | |
1136 | ||
1137 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); | |
1138 | if (unlikely(!inode)) { | |
1139 | dput(dentry); | |
1140 | return NULL; | |
1141 | } | |
1142 | ||
1143 | d_add(dentry, inode); | |
1144 | if (dentry_p) | |
1145 | *dentry_p = dentry; | |
1146 | ||
1147 | return inode; | |
1148 | } | |
1149 | ||
ddf8abd2 | 1150 | /* Super block */ |
ddf8abd2 MN |
1151 | static const struct super_operations ffs_sb_operations = { |
1152 | .statfs = simple_statfs, | |
1153 | .drop_inode = generic_delete_inode, | |
1154 | }; | |
1155 | ||
1156 | struct ffs_sb_fill_data { | |
1157 | struct ffs_file_perms perms; | |
1158 | umode_t root_mode; | |
1159 | const char *dev_name; | |
2606b28a | 1160 | struct ffs_data *ffs_data; |
ddf8abd2 MN |
1161 | }; |
1162 | ||
1163 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) | |
1164 | { | |
1165 | struct ffs_sb_fill_data *data = _data; | |
1166 | struct inode *inode; | |
2606b28a | 1167 | struct ffs_data *ffs = data->ffs_data; |
ddf8abd2 MN |
1168 | |
1169 | ENTER(); | |
1170 | ||
ddf8abd2 | 1171 | ffs->sb = sb; |
2606b28a | 1172 | data->ffs_data = NULL; |
ddf8abd2 MN |
1173 | sb->s_fs_info = ffs; |
1174 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1175 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1176 | sb->s_magic = FUNCTIONFS_MAGIC; | |
1177 | sb->s_op = &ffs_sb_operations; | |
1178 | sb->s_time_gran = 1; | |
1179 | ||
1180 | /* Root inode */ | |
1181 | data->perms.mode = data->root_mode; | |
1182 | inode = ffs_sb_make_inode(sb, NULL, | |
1183 | &simple_dir_operations, | |
1184 | &simple_dir_inode_operations, | |
1185 | &data->perms); | |
48fde701 AV |
1186 | sb->s_root = d_make_root(inode); |
1187 | if (unlikely(!sb->s_root)) | |
2606b28a | 1188 | return -ENOMEM; |
ddf8abd2 MN |
1189 | |
1190 | /* EP0 file */ | |
1191 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, | |
1192 | &ffs_ep0_operations, NULL))) | |
2606b28a | 1193 | return -ENOMEM; |
ddf8abd2 MN |
1194 | |
1195 | return 0; | |
ddf8abd2 MN |
1196 | } |
1197 | ||
ddf8abd2 MN |
1198 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
1199 | { | |
1200 | ENTER(); | |
1201 | ||
1202 | if (!opts || !*opts) | |
1203 | return 0; | |
1204 | ||
1205 | for (;;) { | |
ddf8abd2 | 1206 | unsigned long value; |
afd2e186 | 1207 | char *eq, *comma; |
ddf8abd2 MN |
1208 | |
1209 | /* Option limit */ | |
1210 | comma = strchr(opts, ','); | |
1211 | if (comma) | |
1212 | *comma = 0; | |
1213 | ||
1214 | /* Value limit */ | |
1215 | eq = strchr(opts, '='); | |
1216 | if (unlikely(!eq)) { | |
aa02f172 | 1217 | pr_err("'=' missing in %s\n", opts); |
ddf8abd2 MN |
1218 | return -EINVAL; |
1219 | } | |
1220 | *eq = 0; | |
1221 | ||
1222 | /* Parse value */ | |
afd2e186 | 1223 | if (kstrtoul(eq + 1, 0, &value)) { |
aa02f172 | 1224 | pr_err("%s: invalid value: %s\n", opts, eq + 1); |
ddf8abd2 MN |
1225 | return -EINVAL; |
1226 | } | |
1227 | ||
1228 | /* Interpret option */ | |
1229 | switch (eq - opts) { | |
1230 | case 5: | |
1231 | if (!memcmp(opts, "rmode", 5)) | |
1232 | data->root_mode = (value & 0555) | S_IFDIR; | |
1233 | else if (!memcmp(opts, "fmode", 5)) | |
1234 | data->perms.mode = (value & 0666) | S_IFREG; | |
1235 | else | |
1236 | goto invalid; | |
1237 | break; | |
1238 | ||
1239 | case 4: | |
1240 | if (!memcmp(opts, "mode", 4)) { | |
1241 | data->root_mode = (value & 0555) | S_IFDIR; | |
1242 | data->perms.mode = (value & 0666) | S_IFREG; | |
1243 | } else { | |
1244 | goto invalid; | |
1245 | } | |
1246 | break; | |
1247 | ||
1248 | case 3: | |
b9b73f7c EB |
1249 | if (!memcmp(opts, "uid", 3)) { |
1250 | data->perms.uid = make_kuid(current_user_ns(), value); | |
1251 | if (!uid_valid(data->perms.uid)) { | |
1252 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1253 | return -EINVAL; | |
1254 | } | |
b8100750 | 1255 | } else if (!memcmp(opts, "gid", 3)) { |
b9b73f7c EB |
1256 | data->perms.gid = make_kgid(current_user_ns(), value); |
1257 | if (!gid_valid(data->perms.gid)) { | |
1258 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1259 | return -EINVAL; | |
1260 | } | |
b8100750 | 1261 | } else { |
ddf8abd2 | 1262 | goto invalid; |
b8100750 | 1263 | } |
ddf8abd2 MN |
1264 | break; |
1265 | ||
1266 | default: | |
1267 | invalid: | |
aa02f172 | 1268 | pr_err("%s: invalid option\n", opts); |
ddf8abd2 MN |
1269 | return -EINVAL; |
1270 | } | |
1271 | ||
1272 | /* Next iteration */ | |
1273 | if (!comma) | |
1274 | break; | |
1275 | opts = comma + 1; | |
1276 | } | |
1277 | ||
1278 | return 0; | |
1279 | } | |
1280 | ||
ddf8abd2 MN |
1281 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
1282 | ||
fc14f2fe AV |
1283 | static struct dentry * |
1284 | ffs_fs_mount(struct file_system_type *t, int flags, | |
1285 | const char *dev_name, void *opts) | |
ddf8abd2 MN |
1286 | { |
1287 | struct ffs_sb_fill_data data = { | |
1288 | .perms = { | |
1289 | .mode = S_IFREG | 0600, | |
b9b73f7c EB |
1290 | .uid = GLOBAL_ROOT_UID, |
1291 | .gid = GLOBAL_ROOT_GID, | |
ddf8abd2 MN |
1292 | }, |
1293 | .root_mode = S_IFDIR | 0500, | |
1294 | }; | |
581791f5 | 1295 | struct dentry *rv; |
ddf8abd2 | 1296 | int ret; |
581791f5 | 1297 | void *ffs_dev; |
2606b28a | 1298 | struct ffs_data *ffs; |
ddf8abd2 MN |
1299 | |
1300 | ENTER(); | |
1301 | ||
ddf8abd2 MN |
1302 | ret = ffs_fs_parse_opts(&data, opts); |
1303 | if (unlikely(ret < 0)) | |
fc14f2fe | 1304 | return ERR_PTR(ret); |
ddf8abd2 | 1305 | |
2606b28a AV |
1306 | ffs = ffs_data_new(); |
1307 | if (unlikely(!ffs)) | |
1308 | return ERR_PTR(-ENOMEM); | |
1309 | ffs->file_perms = data.perms; | |
1310 | ||
1311 | ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); | |
1312 | if (unlikely(!ffs->dev_name)) { | |
1313 | ffs_data_put(ffs); | |
1314 | return ERR_PTR(-ENOMEM); | |
1315 | } | |
1316 | ||
4b187fce | 1317 | ffs_dev = ffs_acquire_dev(dev_name); |
2606b28a AV |
1318 | if (IS_ERR(ffs_dev)) { |
1319 | ffs_data_put(ffs); | |
1320 | return ERR_CAST(ffs_dev); | |
1321 | } | |
1322 | ffs->private_data = ffs_dev; | |
1323 | data.ffs_data = ffs; | |
581791f5 | 1324 | |
581791f5 | 1325 | rv = mount_nodev(t, flags, &data, ffs_sb_fill); |
2606b28a | 1326 | if (IS_ERR(rv) && data.ffs_data) { |
4b187fce | 1327 | ffs_release_dev(data.ffs_data); |
2606b28a AV |
1328 | ffs_data_put(data.ffs_data); |
1329 | } | |
581791f5 | 1330 | return rv; |
ddf8abd2 MN |
1331 | } |
1332 | ||
1333 | static void | |
1334 | ffs_fs_kill_sb(struct super_block *sb) | |
1335 | { | |
ddf8abd2 MN |
1336 | ENTER(); |
1337 | ||
1338 | kill_litter_super(sb); | |
581791f5 | 1339 | if (sb->s_fs_info) { |
4b187fce | 1340 | ffs_release_dev(sb->s_fs_info); |
5b5f9560 | 1341 | ffs_data_put(sb->s_fs_info); |
581791f5 | 1342 | } |
ddf8abd2 MN |
1343 | } |
1344 | ||
1345 | static struct file_system_type ffs_fs_type = { | |
1346 | .owner = THIS_MODULE, | |
1347 | .name = "functionfs", | |
fc14f2fe | 1348 | .mount = ffs_fs_mount, |
ddf8abd2 MN |
1349 | .kill_sb = ffs_fs_kill_sb, |
1350 | }; | |
7f78e035 | 1351 | MODULE_ALIAS_FS("functionfs"); |
ddf8abd2 MN |
1352 | |
1353 | ||
ddf8abd2 MN |
1354 | /* Driver's main init/cleanup functions *************************************/ |
1355 | ||
ddf8abd2 MN |
1356 | static int functionfs_init(void) |
1357 | { | |
1358 | int ret; | |
1359 | ||
1360 | ENTER(); | |
1361 | ||
1362 | ret = register_filesystem(&ffs_fs_type); | |
1363 | if (likely(!ret)) | |
aa02f172 | 1364 | pr_info("file system registered\n"); |
ddf8abd2 | 1365 | else |
aa02f172 | 1366 | pr_err("failed registering file system (%d)\n", ret); |
ddf8abd2 MN |
1367 | |
1368 | return ret; | |
1369 | } | |
1370 | ||
1371 | static void functionfs_cleanup(void) | |
1372 | { | |
1373 | ENTER(); | |
1374 | ||
aa02f172 | 1375 | pr_info("unloading\n"); |
ddf8abd2 MN |
1376 | unregister_filesystem(&ffs_fs_type); |
1377 | } | |
1378 | ||
1379 | ||
ddf8abd2 MN |
1380 | /* ffs_data and ffs_function construction and destruction code **************/ |
1381 | ||
1382 | static void ffs_data_clear(struct ffs_data *ffs); | |
1383 | static void ffs_data_reset(struct ffs_data *ffs); | |
1384 | ||
ddf8abd2 MN |
1385 | static void ffs_data_get(struct ffs_data *ffs) |
1386 | { | |
1387 | ENTER(); | |
1388 | ||
1389 | atomic_inc(&ffs->ref); | |
1390 | } | |
1391 | ||
1392 | static void ffs_data_opened(struct ffs_data *ffs) | |
1393 | { | |
1394 | ENTER(); | |
1395 | ||
1396 | atomic_inc(&ffs->ref); | |
1397 | atomic_inc(&ffs->opened); | |
1398 | } | |
1399 | ||
1400 | static void ffs_data_put(struct ffs_data *ffs) | |
1401 | { | |
1402 | ENTER(); | |
1403 | ||
1404 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { | |
aa02f172 | 1405 | pr_info("%s(): freeing\n", __func__); |
ddf8abd2 | 1406 | ffs_data_clear(ffs); |
647d5580 | 1407 | BUG_ON(waitqueue_active(&ffs->ev.waitq) || |
ddf8abd2 | 1408 | waitqueue_active(&ffs->ep0req_completion.wait)); |
581791f5 | 1409 | kfree(ffs->dev_name); |
ddf8abd2 MN |
1410 | kfree(ffs); |
1411 | } | |
1412 | } | |
1413 | ||
ddf8abd2 MN |
1414 | static void ffs_data_closed(struct ffs_data *ffs) |
1415 | { | |
1416 | ENTER(); | |
1417 | ||
1418 | if (atomic_dec_and_test(&ffs->opened)) { | |
1419 | ffs->state = FFS_CLOSING; | |
1420 | ffs_data_reset(ffs); | |
1421 | } | |
1422 | ||
1423 | ffs_data_put(ffs); | |
1424 | } | |
1425 | ||
ddf8abd2 MN |
1426 | static struct ffs_data *ffs_data_new(void) |
1427 | { | |
1428 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); | |
1429 | if (unlikely(!ffs)) | |
f8800d47 | 1430 | return NULL; |
ddf8abd2 MN |
1431 | |
1432 | ENTER(); | |
1433 | ||
1434 | atomic_set(&ffs->ref, 1); | |
1435 | atomic_set(&ffs->opened, 0); | |
1436 | ffs->state = FFS_READ_DESCRIPTORS; | |
1437 | mutex_init(&ffs->mutex); | |
1438 | spin_lock_init(&ffs->eps_lock); | |
1439 | init_waitqueue_head(&ffs->ev.waitq); | |
1440 | init_completion(&ffs->ep0req_completion); | |
1441 | ||
1442 | /* XXX REVISIT need to update it in some places, or do we? */ | |
1443 | ffs->ev.can_stall = 1; | |
1444 | ||
1445 | return ffs; | |
1446 | } | |
1447 | ||
ddf8abd2 MN |
1448 | static void ffs_data_clear(struct ffs_data *ffs) |
1449 | { | |
1450 | ENTER(); | |
1451 | ||
1452 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags)) | |
4b187fce | 1453 | ffs_closed(ffs); |
ddf8abd2 MN |
1454 | |
1455 | BUG_ON(ffs->gadget); | |
1456 | ||
1457 | if (ffs->epfiles) | |
1458 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); | |
1459 | ||
ac8dde11 | 1460 | kfree(ffs->raw_descs_data); |
ddf8abd2 MN |
1461 | kfree(ffs->raw_strings); |
1462 | kfree(ffs->stringtabs); | |
1463 | } | |
1464 | ||
ddf8abd2 MN |
1465 | static void ffs_data_reset(struct ffs_data *ffs) |
1466 | { | |
1467 | ENTER(); | |
1468 | ||
1469 | ffs_data_clear(ffs); | |
1470 | ||
1471 | ffs->epfiles = NULL; | |
ac8dde11 | 1472 | ffs->raw_descs_data = NULL; |
ddf8abd2 MN |
1473 | ffs->raw_descs = NULL; |
1474 | ffs->raw_strings = NULL; | |
1475 | ffs->stringtabs = NULL; | |
1476 | ||
1477 | ffs->raw_descs_length = 0; | |
ddf8abd2 MN |
1478 | ffs->fs_descs_count = 0; |
1479 | ffs->hs_descs_count = 0; | |
8d4e897b | 1480 | ffs->ss_descs_count = 0; |
ddf8abd2 MN |
1481 | |
1482 | ffs->strings_count = 0; | |
1483 | ffs->interfaces_count = 0; | |
1484 | ffs->eps_count = 0; | |
1485 | ||
1486 | ffs->ev.count = 0; | |
1487 | ||
1488 | ffs->state = FFS_READ_DESCRIPTORS; | |
1489 | ffs->setup_state = FFS_NO_SETUP; | |
1490 | ffs->flags = 0; | |
1491 | } | |
1492 | ||
1493 | ||
1494 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) | |
1495 | { | |
fd7c9a00 MN |
1496 | struct usb_gadget_strings **lang; |
1497 | int first_id; | |
ddf8abd2 MN |
1498 | |
1499 | ENTER(); | |
1500 | ||
1501 | if (WARN_ON(ffs->state != FFS_ACTIVE | |
1502 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) | |
1503 | return -EBADFD; | |
1504 | ||
fd7c9a00 MN |
1505 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
1506 | if (unlikely(first_id < 0)) | |
1507 | return first_id; | |
ddf8abd2 MN |
1508 | |
1509 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); | |
1510 | if (unlikely(!ffs->ep0req)) | |
1511 | return -ENOMEM; | |
1512 | ffs->ep0req->complete = ffs_ep0_complete; | |
1513 | ffs->ep0req->context = ffs; | |
1514 | ||
fd7c9a00 | 1515 | lang = ffs->stringtabs; |
f0688c8b MN |
1516 | if (lang) { |
1517 | for (; *lang; ++lang) { | |
1518 | struct usb_string *str = (*lang)->strings; | |
1519 | int id = first_id; | |
1520 | for (; str->s; ++id, ++str) | |
1521 | str->id = id; | |
1522 | } | |
ddf8abd2 MN |
1523 | } |
1524 | ||
1525 | ffs->gadget = cdev->gadget; | |
fd7c9a00 | 1526 | ffs_data_get(ffs); |
ddf8abd2 MN |
1527 | return 0; |
1528 | } | |
1529 | ||
ddf8abd2 MN |
1530 | static void functionfs_unbind(struct ffs_data *ffs) |
1531 | { | |
1532 | ENTER(); | |
1533 | ||
1534 | if (!WARN_ON(!ffs->gadget)) { | |
1535 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); | |
1536 | ffs->ep0req = NULL; | |
1537 | ffs->gadget = NULL; | |
e2190a97 | 1538 | clear_bit(FFS_FL_BOUND, &ffs->flags); |
df498995 | 1539 | ffs_data_put(ffs); |
ddf8abd2 MN |
1540 | } |
1541 | } | |
1542 | ||
ddf8abd2 MN |
1543 | static int ffs_epfiles_create(struct ffs_data *ffs) |
1544 | { | |
1545 | struct ffs_epfile *epfile, *epfiles; | |
1546 | unsigned i, count; | |
1547 | ||
1548 | ENTER(); | |
1549 | ||
1550 | count = ffs->eps_count; | |
9823a525 | 1551 | epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL); |
ddf8abd2 MN |
1552 | if (!epfiles) |
1553 | return -ENOMEM; | |
1554 | ||
1555 | epfile = epfiles; | |
1556 | for (i = 1; i <= count; ++i, ++epfile) { | |
1557 | epfile->ffs = ffs; | |
1558 | mutex_init(&epfile->mutex); | |
1559 | init_waitqueue_head(&epfile->wait); | |
1560 | sprintf(epfiles->name, "ep%u", i); | |
1561 | if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile, | |
1562 | &ffs_epfile_operations, | |
1563 | &epfile->dentry))) { | |
1564 | ffs_epfiles_destroy(epfiles, i - 1); | |
1565 | return -ENOMEM; | |
1566 | } | |
1567 | } | |
1568 | ||
1569 | ffs->epfiles = epfiles; | |
1570 | return 0; | |
1571 | } | |
1572 | ||
ddf8abd2 MN |
1573 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
1574 | { | |
1575 | struct ffs_epfile *epfile = epfiles; | |
1576 | ||
1577 | ENTER(); | |
1578 | ||
1579 | for (; count; --count, ++epfile) { | |
1580 | BUG_ON(mutex_is_locked(&epfile->mutex) || | |
1581 | waitqueue_active(&epfile->wait)); | |
1582 | if (epfile->dentry) { | |
1583 | d_delete(epfile->dentry); | |
1584 | dput(epfile->dentry); | |
1585 | epfile->dentry = NULL; | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | kfree(epfiles); | |
1590 | } | |
1591 | ||
5920cda6 | 1592 | |
ddf8abd2 MN |
1593 | static void ffs_func_eps_disable(struct ffs_function *func) |
1594 | { | |
1595 | struct ffs_ep *ep = func->eps; | |
1596 | struct ffs_epfile *epfile = func->ffs->epfiles; | |
1597 | unsigned count = func->ffs->eps_count; | |
1598 | unsigned long flags; | |
1599 | ||
1600 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1601 | do { | |
1602 | /* pending requests get nuked */ | |
1603 | if (likely(ep->ep)) | |
1604 | usb_ep_disable(ep->ep); | |
1605 | epfile->ep = NULL; | |
1606 | ||
1607 | ++ep; | |
1608 | ++epfile; | |
1609 | } while (--count); | |
1610 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1611 | } | |
1612 | ||
1613 | static int ffs_func_eps_enable(struct ffs_function *func) | |
1614 | { | |
1615 | struct ffs_data *ffs = func->ffs; | |
1616 | struct ffs_ep *ep = func->eps; | |
1617 | struct ffs_epfile *epfile = ffs->epfiles; | |
1618 | unsigned count = ffs->eps_count; | |
1619 | unsigned long flags; | |
1620 | int ret = 0; | |
1621 | ||
1622 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1623 | do { | |
1624 | struct usb_endpoint_descriptor *ds; | |
8d4e897b MG |
1625 | int desc_idx; |
1626 | ||
1627 | if (ffs->gadget->speed == USB_SPEED_SUPER) | |
1628 | desc_idx = 2; | |
1629 | else if (ffs->gadget->speed == USB_SPEED_HIGH) | |
1630 | desc_idx = 1; | |
1631 | else | |
1632 | desc_idx = 0; | |
1633 | ||
1634 | /* fall-back to lower speed if desc missing for current speed */ | |
1635 | do { | |
1636 | ds = ep->descs[desc_idx]; | |
1637 | } while (!ds && --desc_idx >= 0); | |
1638 | ||
1639 | if (!ds) { | |
1640 | ret = -EINVAL; | |
1641 | break; | |
1642 | } | |
ddf8abd2 MN |
1643 | |
1644 | ep->ep->driver_data = ep; | |
72c973dd TB |
1645 | ep->ep->desc = ds; |
1646 | ret = usb_ep_enable(ep->ep); | |
ddf8abd2 MN |
1647 | if (likely(!ret)) { |
1648 | epfile->ep = ep; | |
1649 | epfile->in = usb_endpoint_dir_in(ds); | |
1650 | epfile->isoc = usb_endpoint_xfer_isoc(ds); | |
1651 | } else { | |
1652 | break; | |
1653 | } | |
1654 | ||
1655 | wake_up(&epfile->wait); | |
1656 | ||
1657 | ++ep; | |
1658 | ++epfile; | |
1659 | } while (--count); | |
1660 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1661 | ||
1662 | return ret; | |
1663 | } | |
1664 | ||
1665 | ||
1666 | /* Parsing and building descriptors and strings *****************************/ | |
1667 | ||
5ab54cf7 MN |
1668 | /* |
1669 | * This validates if data pointed by data is a valid USB descriptor as | |
ddf8abd2 | 1670 | * well as record how many interfaces, endpoints and strings are |
5ab54cf7 MN |
1671 | * required by given configuration. Returns address after the |
1672 | * descriptor or NULL if data is invalid. | |
1673 | */ | |
ddf8abd2 MN |
1674 | |
1675 | enum ffs_entity_type { | |
1676 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT | |
1677 | }; | |
1678 | ||
f0175ab5 AP |
1679 | enum ffs_os_desc_type { |
1680 | FFS_OS_DESC, FFS_OS_DESC_EXT_COMPAT, FFS_OS_DESC_EXT_PROP | |
1681 | }; | |
1682 | ||
ddf8abd2 MN |
1683 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, |
1684 | u8 *valuep, | |
1685 | struct usb_descriptor_header *desc, | |
1686 | void *priv); | |
1687 | ||
f0175ab5 AP |
1688 | typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, |
1689 | struct usb_os_desc_header *h, void *data, | |
1690 | unsigned len, void *priv); | |
1691 | ||
f96cbd14 AP |
1692 | static int __must_check ffs_do_single_desc(char *data, unsigned len, |
1693 | ffs_entity_callback entity, | |
1694 | void *priv) | |
ddf8abd2 MN |
1695 | { |
1696 | struct usb_descriptor_header *_ds = (void *)data; | |
1697 | u8 length; | |
1698 | int ret; | |
1699 | ||
1700 | ENTER(); | |
1701 | ||
1702 | /* At least two bytes are required: length and type */ | |
1703 | if (len < 2) { | |
aa02f172 | 1704 | pr_vdebug("descriptor too short\n"); |
ddf8abd2 MN |
1705 | return -EINVAL; |
1706 | } | |
1707 | ||
1708 | /* If we have at least as many bytes as the descriptor takes? */ | |
1709 | length = _ds->bLength; | |
1710 | if (len < length) { | |
aa02f172 | 1711 | pr_vdebug("descriptor longer then available data\n"); |
ddf8abd2 MN |
1712 | return -EINVAL; |
1713 | } | |
1714 | ||
1715 | #define __entity_check_INTERFACE(val) 1 | |
1716 | #define __entity_check_STRING(val) (val) | |
1717 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) | |
1718 | #define __entity(type, val) do { \ | |
aa02f172 | 1719 | pr_vdebug("entity " #type "(%02x)\n", (val)); \ |
ddf8abd2 | 1720 | if (unlikely(!__entity_check_ ##type(val))) { \ |
aa02f172 | 1721 | pr_vdebug("invalid entity's value\n"); \ |
ddf8abd2 MN |
1722 | return -EINVAL; \ |
1723 | } \ | |
1724 | ret = entity(FFS_ ##type, &val, _ds, priv); \ | |
1725 | if (unlikely(ret < 0)) { \ | |
aa02f172 | 1726 | pr_debug("entity " #type "(%02x); ret = %d\n", \ |
d8df0b61 | 1727 | (val), ret); \ |
ddf8abd2 MN |
1728 | return ret; \ |
1729 | } \ | |
1730 | } while (0) | |
1731 | ||
1732 | /* Parse descriptor depending on type. */ | |
1733 | switch (_ds->bDescriptorType) { | |
1734 | case USB_DT_DEVICE: | |
1735 | case USB_DT_CONFIG: | |
1736 | case USB_DT_STRING: | |
1737 | case USB_DT_DEVICE_QUALIFIER: | |
1738 | /* function can't have any of those */ | |
aa02f172 | 1739 | pr_vdebug("descriptor reserved for gadget: %d\n", |
5ab54cf7 | 1740 | _ds->bDescriptorType); |
ddf8abd2 MN |
1741 | return -EINVAL; |
1742 | ||
1743 | case USB_DT_INTERFACE: { | |
1744 | struct usb_interface_descriptor *ds = (void *)_ds; | |
aa02f172 | 1745 | pr_vdebug("interface descriptor\n"); |
ddf8abd2 MN |
1746 | if (length != sizeof *ds) |
1747 | goto inv_length; | |
1748 | ||
1749 | __entity(INTERFACE, ds->bInterfaceNumber); | |
1750 | if (ds->iInterface) | |
1751 | __entity(STRING, ds->iInterface); | |
1752 | } | |
1753 | break; | |
1754 | ||
1755 | case USB_DT_ENDPOINT: { | |
1756 | struct usb_endpoint_descriptor *ds = (void *)_ds; | |
aa02f172 | 1757 | pr_vdebug("endpoint descriptor\n"); |
ddf8abd2 MN |
1758 | if (length != USB_DT_ENDPOINT_SIZE && |
1759 | length != USB_DT_ENDPOINT_AUDIO_SIZE) | |
1760 | goto inv_length; | |
1761 | __entity(ENDPOINT, ds->bEndpointAddress); | |
1762 | } | |
1763 | break; | |
1764 | ||
560f1187 KB |
1765 | case HID_DT_HID: |
1766 | pr_vdebug("hid descriptor\n"); | |
1767 | if (length != sizeof(struct hid_descriptor)) | |
1768 | goto inv_length; | |
1769 | break; | |
1770 | ||
ddf8abd2 MN |
1771 | case USB_DT_OTG: |
1772 | if (length != sizeof(struct usb_otg_descriptor)) | |
1773 | goto inv_length; | |
1774 | break; | |
1775 | ||
1776 | case USB_DT_INTERFACE_ASSOCIATION: { | |
1777 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; | |
aa02f172 | 1778 | pr_vdebug("interface association descriptor\n"); |
ddf8abd2 MN |
1779 | if (length != sizeof *ds) |
1780 | goto inv_length; | |
1781 | if (ds->iFunction) | |
1782 | __entity(STRING, ds->iFunction); | |
1783 | } | |
1784 | break; | |
1785 | ||
8d4e897b MG |
1786 | case USB_DT_SS_ENDPOINT_COMP: |
1787 | pr_vdebug("EP SS companion descriptor\n"); | |
1788 | if (length != sizeof(struct usb_ss_ep_comp_descriptor)) | |
1789 | goto inv_length; | |
1790 | break; | |
1791 | ||
ddf8abd2 MN |
1792 | case USB_DT_OTHER_SPEED_CONFIG: |
1793 | case USB_DT_INTERFACE_POWER: | |
1794 | case USB_DT_DEBUG: | |
1795 | case USB_DT_SECURITY: | |
1796 | case USB_DT_CS_RADIO_CONTROL: | |
1797 | /* TODO */ | |
aa02f172 | 1798 | pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1799 | return -EINVAL; |
1800 | ||
1801 | default: | |
1802 | /* We should never be here */ | |
aa02f172 | 1803 | pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1804 | return -EINVAL; |
1805 | ||
5ab54cf7 | 1806 | inv_length: |
aa02f172 | 1807 | pr_vdebug("invalid length: %d (descriptor %d)\n", |
d8df0b61 | 1808 | _ds->bLength, _ds->bDescriptorType); |
ddf8abd2 MN |
1809 | return -EINVAL; |
1810 | } | |
1811 | ||
1812 | #undef __entity | |
1813 | #undef __entity_check_DESCRIPTOR | |
1814 | #undef __entity_check_INTERFACE | |
1815 | #undef __entity_check_STRING | |
1816 | #undef __entity_check_ENDPOINT | |
1817 | ||
1818 | return length; | |
1819 | } | |
1820 | ||
ddf8abd2 MN |
1821 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
1822 | ffs_entity_callback entity, void *priv) | |
1823 | { | |
1824 | const unsigned _len = len; | |
1825 | unsigned long num = 0; | |
1826 | ||
1827 | ENTER(); | |
1828 | ||
1829 | for (;;) { | |
1830 | int ret; | |
1831 | ||
1832 | if (num == count) | |
1833 | data = NULL; | |
1834 | ||
5ab54cf7 | 1835 | /* Record "descriptor" entity */ |
ddf8abd2 MN |
1836 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
1837 | if (unlikely(ret < 0)) { | |
aa02f172 | 1838 | pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", |
d8df0b61 | 1839 | num, ret); |
ddf8abd2 MN |
1840 | return ret; |
1841 | } | |
1842 | ||
1843 | if (!data) | |
1844 | return _len - len; | |
1845 | ||
f96cbd14 | 1846 | ret = ffs_do_single_desc(data, len, entity, priv); |
ddf8abd2 | 1847 | if (unlikely(ret < 0)) { |
aa02f172 | 1848 | pr_debug("%s returns %d\n", __func__, ret); |
ddf8abd2 MN |
1849 | return ret; |
1850 | } | |
1851 | ||
1852 | len -= ret; | |
1853 | data += ret; | |
1854 | ++num; | |
1855 | } | |
1856 | } | |
1857 | ||
ddf8abd2 MN |
1858 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
1859 | u8 *valuep, struct usb_descriptor_header *desc, | |
1860 | void *priv) | |
1861 | { | |
6d5c1c77 RB |
1862 | struct ffs_desc_helper *helper = priv; |
1863 | struct usb_endpoint_descriptor *d; | |
ddf8abd2 MN |
1864 | |
1865 | ENTER(); | |
1866 | ||
1867 | switch (type) { | |
1868 | case FFS_DESCRIPTOR: | |
1869 | break; | |
1870 | ||
1871 | case FFS_INTERFACE: | |
5ab54cf7 MN |
1872 | /* |
1873 | * Interfaces are indexed from zero so if we | |
ddf8abd2 | 1874 | * encountered interface "n" then there are at least |
5ab54cf7 MN |
1875 | * "n+1" interfaces. |
1876 | */ | |
6d5c1c77 RB |
1877 | if (*valuep >= helper->interfaces_count) |
1878 | helper->interfaces_count = *valuep + 1; | |
ddf8abd2 MN |
1879 | break; |
1880 | ||
1881 | case FFS_STRING: | |
5ab54cf7 MN |
1882 | /* |
1883 | * Strings are indexed from 1 (0 is magic ;) reserved | |
1884 | * for languages list or some such) | |
1885 | */ | |
6d5c1c77 RB |
1886 | if (*valuep > helper->ffs->strings_count) |
1887 | helper->ffs->strings_count = *valuep; | |
ddf8abd2 MN |
1888 | break; |
1889 | ||
1890 | case FFS_ENDPOINT: | |
6d5c1c77 RB |
1891 | d = (void *)desc; |
1892 | helper->eps_count++; | |
1893 | if (helper->eps_count >= 15) | |
1894 | return -EINVAL; | |
1895 | /* Check if descriptors for any speed were already parsed */ | |
1896 | if (!helper->ffs->eps_count && !helper->ffs->interfaces_count) | |
1897 | helper->ffs->eps_addrmap[helper->eps_count] = | |
1898 | d->bEndpointAddress; | |
1899 | else if (helper->ffs->eps_addrmap[helper->eps_count] != | |
1900 | d->bEndpointAddress) | |
1901 | return -EINVAL; | |
ddf8abd2 MN |
1902 | break; |
1903 | } | |
1904 | ||
1905 | return 0; | |
1906 | } | |
1907 | ||
f0175ab5 AP |
1908 | static int __ffs_do_os_desc_header(enum ffs_os_desc_type *next_type, |
1909 | struct usb_os_desc_header *desc) | |
1910 | { | |
1911 | u16 bcd_version = le16_to_cpu(desc->bcdVersion); | |
1912 | u16 w_index = le16_to_cpu(desc->wIndex); | |
1913 | ||
1914 | if (bcd_version != 1) { | |
1915 | pr_vdebug("unsupported os descriptors version: %d", | |
1916 | bcd_version); | |
1917 | return -EINVAL; | |
1918 | } | |
1919 | switch (w_index) { | |
1920 | case 0x4: | |
1921 | *next_type = FFS_OS_DESC_EXT_COMPAT; | |
1922 | break; | |
1923 | case 0x5: | |
1924 | *next_type = FFS_OS_DESC_EXT_PROP; | |
1925 | break; | |
1926 | default: | |
1927 | pr_vdebug("unsupported os descriptor type: %d", w_index); | |
1928 | return -EINVAL; | |
1929 | } | |
1930 | ||
1931 | return sizeof(*desc); | |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * Process all extended compatibility/extended property descriptors | |
1936 | * of a feature descriptor | |
1937 | */ | |
1938 | static int __must_check ffs_do_single_os_desc(char *data, unsigned len, | |
1939 | enum ffs_os_desc_type type, | |
1940 | u16 feature_count, | |
1941 | ffs_os_desc_callback entity, | |
1942 | void *priv, | |
1943 | struct usb_os_desc_header *h) | |
1944 | { | |
1945 | int ret; | |
1946 | const unsigned _len = len; | |
1947 | ||
1948 | ENTER(); | |
1949 | ||
1950 | /* loop over all ext compat/ext prop descriptors */ | |
1951 | while (feature_count--) { | |
1952 | ret = entity(type, h, data, len, priv); | |
1953 | if (unlikely(ret < 0)) { | |
1954 | pr_debug("bad OS descriptor, type: %d\n", type); | |
1955 | return ret; | |
1956 | } | |
1957 | data += ret; | |
1958 | len -= ret; | |
1959 | } | |
1960 | return _len - len; | |
1961 | } | |
1962 | ||
1963 | /* Process a number of complete Feature Descriptors (Ext Compat or Ext Prop) */ | |
1964 | static int __must_check ffs_do_os_descs(unsigned count, | |
1965 | char *data, unsigned len, | |
1966 | ffs_os_desc_callback entity, void *priv) | |
1967 | { | |
1968 | const unsigned _len = len; | |
1969 | unsigned long num = 0; | |
1970 | ||
1971 | ENTER(); | |
1972 | ||
1973 | for (num = 0; num < count; ++num) { | |
1974 | int ret; | |
1975 | enum ffs_os_desc_type type; | |
1976 | u16 feature_count; | |
1977 | struct usb_os_desc_header *desc = (void *)data; | |
1978 | ||
1979 | if (len < sizeof(*desc)) | |
1980 | return -EINVAL; | |
1981 | ||
1982 | /* | |
1983 | * Record "descriptor" entity. | |
1984 | * Process dwLength, bcdVersion, wIndex, get b/wCount. | |
1985 | * Move the data pointer to the beginning of extended | |
1986 | * compatibilities proper or extended properties proper | |
1987 | * portions of the data | |
1988 | */ | |
1989 | if (le32_to_cpu(desc->dwLength) > len) | |
1990 | return -EINVAL; | |
1991 | ||
1992 | ret = __ffs_do_os_desc_header(&type, desc); | |
1993 | if (unlikely(ret < 0)) { | |
1994 | pr_debug("entity OS_DESCRIPTOR(%02lx); ret = %d\n", | |
1995 | num, ret); | |
1996 | return ret; | |
1997 | } | |
1998 | /* | |
1999 | * 16-bit hex "?? 00" Little Endian looks like 8-bit hex "??" | |
2000 | */ | |
2001 | feature_count = le16_to_cpu(desc->wCount); | |
2002 | if (type == FFS_OS_DESC_EXT_COMPAT && | |
2003 | (feature_count > 255 || desc->Reserved)) | |
2004 | return -EINVAL; | |
2005 | len -= ret; | |
2006 | data += ret; | |
2007 | ||
2008 | /* | |
2009 | * Process all function/property descriptors | |
2010 | * of this Feature Descriptor | |
2011 | */ | |
2012 | ret = ffs_do_single_os_desc(data, len, type, | |
2013 | feature_count, entity, priv, desc); | |
2014 | if (unlikely(ret < 0)) { | |
2015 | pr_debug("%s returns %d\n", __func__, ret); | |
2016 | return ret; | |
2017 | } | |
2018 | ||
2019 | len -= ret; | |
2020 | data += ret; | |
2021 | } | |
2022 | return _len - len; | |
2023 | } | |
2024 | ||
2025 | /** | |
2026 | * Validate contents of the buffer from userspace related to OS descriptors. | |
2027 | */ | |
2028 | static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, | |
2029 | struct usb_os_desc_header *h, void *data, | |
2030 | unsigned len, void *priv) | |
2031 | { | |
2032 | struct ffs_data *ffs = priv; | |
2033 | u8 length; | |
2034 | ||
2035 | ENTER(); | |
2036 | ||
2037 | switch (type) { | |
2038 | case FFS_OS_DESC_EXT_COMPAT: { | |
2039 | struct usb_ext_compat_desc *d = data; | |
2040 | int i; | |
2041 | ||
2042 | if (len < sizeof(*d) || | |
2043 | d->bFirstInterfaceNumber >= ffs->interfaces_count || | |
2044 | d->Reserved1) | |
2045 | return -EINVAL; | |
2046 | for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) | |
2047 | if (d->Reserved2[i]) | |
2048 | return -EINVAL; | |
2049 | ||
2050 | length = sizeof(struct usb_ext_compat_desc); | |
2051 | } | |
2052 | break; | |
2053 | case FFS_OS_DESC_EXT_PROP: { | |
2054 | struct usb_ext_prop_desc *d = data; | |
2055 | u32 type, pdl; | |
2056 | u16 pnl; | |
2057 | ||
2058 | if (len < sizeof(*d) || h->interface >= ffs->interfaces_count) | |
2059 | return -EINVAL; | |
2060 | length = le32_to_cpu(d->dwSize); | |
2061 | type = le32_to_cpu(d->dwPropertyDataType); | |
2062 | if (type < USB_EXT_PROP_UNICODE || | |
2063 | type > USB_EXT_PROP_UNICODE_MULTI) { | |
2064 | pr_vdebug("unsupported os descriptor property type: %d", | |
2065 | type); | |
2066 | return -EINVAL; | |
2067 | } | |
2068 | pnl = le16_to_cpu(d->wPropertyNameLength); | |
2069 | pdl = le32_to_cpu(*(u32 *)((u8 *)data + 10 + pnl)); | |
2070 | if (length != 14 + pnl + pdl) { | |
2071 | pr_vdebug("invalid os descriptor length: %d pnl:%d pdl:%d (descriptor %d)\n", | |
2072 | length, pnl, pdl, type); | |
2073 | return -EINVAL; | |
2074 | } | |
2075 | ++ffs->ms_os_descs_ext_prop_count; | |
2076 | /* property name reported to the host as "WCHAR"s */ | |
2077 | ffs->ms_os_descs_ext_prop_name_len += pnl * 2; | |
2078 | ffs->ms_os_descs_ext_prop_data_len += pdl; | |
2079 | } | |
2080 | break; | |
2081 | default: | |
2082 | pr_vdebug("unknown descriptor: %d\n", type); | |
2083 | return -EINVAL; | |
2084 | } | |
2085 | return length; | |
2086 | } | |
2087 | ||
ddf8abd2 MN |
2088 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
2089 | char *const _data, size_t len) | |
2090 | { | |
ac8dde11 | 2091 | char *data = _data, *raw_descs; |
f0175ab5 | 2092 | unsigned os_descs_count = 0, counts[3], flags; |
ac8dde11 | 2093 | int ret = -EINVAL, i; |
6d5c1c77 | 2094 | struct ffs_desc_helper helper; |
ddf8abd2 MN |
2095 | |
2096 | ENTER(); | |
2097 | ||
ac8dde11 | 2098 | if (get_unaligned_le32(data + 4) != len) |
ddf8abd2 | 2099 | goto error; |
ddf8abd2 | 2100 | |
ac8dde11 MN |
2101 | switch (get_unaligned_le32(data)) { |
2102 | case FUNCTIONFS_DESCRIPTORS_MAGIC: | |
2103 | flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; | |
2104 | data += 8; | |
2105 | len -= 8; | |
2106 | break; | |
2107 | case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: | |
2108 | flags = get_unaligned_le32(data + 8); | |
2109 | if (flags & ~(FUNCTIONFS_HAS_FS_DESC | | |
2110 | FUNCTIONFS_HAS_HS_DESC | | |
f0175ab5 AP |
2111 | FUNCTIONFS_HAS_SS_DESC | |
2112 | FUNCTIONFS_HAS_MS_OS_DESC)) { | |
ac8dde11 | 2113 | ret = -ENOSYS; |
ddf8abd2 MN |
2114 | goto error; |
2115 | } | |
ac8dde11 MN |
2116 | data += 12; |
2117 | len -= 12; | |
2118 | break; | |
2119 | default: | |
2120 | goto error; | |
ddf8abd2 | 2121 | } |
ddf8abd2 | 2122 | |
ac8dde11 MN |
2123 | /* Read fs_count, hs_count and ss_count (if present) */ |
2124 | for (i = 0; i < 3; ++i) { | |
2125 | if (!(flags & (1 << i))) { | |
2126 | counts[i] = 0; | |
2127 | } else if (len < 4) { | |
8d4e897b | 2128 | goto error; |
ac8dde11 MN |
2129 | } else { |
2130 | counts[i] = get_unaligned_le32(data); | |
2131 | data += 4; | |
2132 | len -= 4; | |
8d4e897b | 2133 | } |
ddf8abd2 | 2134 | } |
f0175ab5 AP |
2135 | if (flags & (1 << i)) { |
2136 | os_descs_count = get_unaligned_le32(data); | |
2137 | data += 4; | |
2138 | len -= 4; | |
2139 | }; | |
ddf8abd2 | 2140 | |
ac8dde11 MN |
2141 | /* Read descriptors */ |
2142 | raw_descs = data; | |
6d5c1c77 | 2143 | helper.ffs = ffs; |
ac8dde11 MN |
2144 | for (i = 0; i < 3; ++i) { |
2145 | if (!counts[i]) | |
2146 | continue; | |
6d5c1c77 RB |
2147 | helper.interfaces_count = 0; |
2148 | helper.eps_count = 0; | |
ac8dde11 | 2149 | ret = ffs_do_descs(counts[i], data, len, |
6d5c1c77 | 2150 | __ffs_data_do_entity, &helper); |
ac8dde11 | 2151 | if (ret < 0) |
ddf8abd2 | 2152 | goto error; |
6d5c1c77 RB |
2153 | if (!ffs->eps_count && !ffs->interfaces_count) { |
2154 | ffs->eps_count = helper.eps_count; | |
2155 | ffs->interfaces_count = helper.interfaces_count; | |
2156 | } else { | |
2157 | if (ffs->eps_count != helper.eps_count) { | |
2158 | ret = -EINVAL; | |
2159 | goto error; | |
2160 | } | |
2161 | if (ffs->interfaces_count != helper.interfaces_count) { | |
2162 | ret = -EINVAL; | |
2163 | goto error; | |
2164 | } | |
2165 | } | |
ac8dde11 MN |
2166 | data += ret; |
2167 | len -= ret; | |
ddf8abd2 | 2168 | } |
f0175ab5 AP |
2169 | if (os_descs_count) { |
2170 | ret = ffs_do_os_descs(os_descs_count, data, len, | |
2171 | __ffs_data_do_os_desc, ffs); | |
2172 | if (ret < 0) | |
2173 | goto error; | |
2174 | data += ret; | |
2175 | len -= ret; | |
2176 | } | |
ddf8abd2 | 2177 | |
ac8dde11 MN |
2178 | if (raw_descs == data || len) { |
2179 | ret = -EINVAL; | |
2180 | goto error; | |
2181 | } | |
ddf8abd2 | 2182 | |
ac8dde11 MN |
2183 | ffs->raw_descs_data = _data; |
2184 | ffs->raw_descs = raw_descs; | |
2185 | ffs->raw_descs_length = data - raw_descs; | |
2186 | ffs->fs_descs_count = counts[0]; | |
2187 | ffs->hs_descs_count = counts[1]; | |
2188 | ffs->ss_descs_count = counts[2]; | |
f0175ab5 | 2189 | ffs->ms_os_descs_count = os_descs_count; |
ddf8abd2 MN |
2190 | |
2191 | return 0; | |
2192 | ||
ddf8abd2 MN |
2193 | error: |
2194 | kfree(_data); | |
2195 | return ret; | |
2196 | } | |
2197 | ||
ddf8abd2 MN |
2198 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
2199 | char *const _data, size_t len) | |
2200 | { | |
2201 | u32 str_count, needed_count, lang_count; | |
2202 | struct usb_gadget_strings **stringtabs, *t; | |
2203 | struct usb_string *strings, *s; | |
2204 | const char *data = _data; | |
2205 | ||
2206 | ENTER(); | |
2207 | ||
2208 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || | |
2209 | get_unaligned_le32(data + 4) != len)) | |
2210 | goto error; | |
2211 | str_count = get_unaligned_le32(data + 8); | |
2212 | lang_count = get_unaligned_le32(data + 12); | |
2213 | ||
2214 | /* if one is zero the other must be zero */ | |
2215 | if (unlikely(!str_count != !lang_count)) | |
2216 | goto error; | |
2217 | ||
2218 | /* Do we have at least as many strings as descriptors need? */ | |
2219 | needed_count = ffs->strings_count; | |
2220 | if (unlikely(str_count < needed_count)) | |
2221 | goto error; | |
2222 | ||
5ab54cf7 MN |
2223 | /* |
2224 | * If we don't need any strings just return and free all | |
2225 | * memory. | |
2226 | */ | |
ddf8abd2 MN |
2227 | if (!needed_count) { |
2228 | kfree(_data); | |
2229 | return 0; | |
2230 | } | |
2231 | ||
5ab54cf7 | 2232 | /* Allocate everything in one chunk so there's less maintenance. */ |
ddf8abd2 | 2233 | { |
ddf8abd2 | 2234 | unsigned i = 0; |
e6f3862f AP |
2235 | vla_group(d); |
2236 | vla_item(d, struct usb_gadget_strings *, stringtabs, | |
2237 | lang_count + 1); | |
2238 | vla_item(d, struct usb_gadget_strings, stringtab, lang_count); | |
2239 | vla_item(d, struct usb_string, strings, | |
2240 | lang_count*(needed_count+1)); | |
ddf8abd2 | 2241 | |
e6f3862f AP |
2242 | char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); |
2243 | ||
2244 | if (unlikely(!vlabuf)) { | |
ddf8abd2 MN |
2245 | kfree(_data); |
2246 | return -ENOMEM; | |
2247 | } | |
2248 | ||
e6f3862f AP |
2249 | /* Initialize the VLA pointers */ |
2250 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2251 | t = vla_ptr(vlabuf, d, stringtab); | |
ddf8abd2 MN |
2252 | i = lang_count; |
2253 | do { | |
2254 | *stringtabs++ = t++; | |
2255 | } while (--i); | |
2256 | *stringtabs = NULL; | |
2257 | ||
e6f3862f AP |
2258 | /* stringtabs = vlabuf = d_stringtabs for later kfree */ |
2259 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2260 | t = vla_ptr(vlabuf, d, stringtab); | |
2261 | s = vla_ptr(vlabuf, d, strings); | |
ddf8abd2 MN |
2262 | strings = s; |
2263 | } | |
2264 | ||
2265 | /* For each language */ | |
2266 | data += 16; | |
2267 | len -= 16; | |
2268 | ||
2269 | do { /* lang_count > 0 so we can use do-while */ | |
2270 | unsigned needed = needed_count; | |
2271 | ||
2272 | if (unlikely(len < 3)) | |
2273 | goto error_free; | |
2274 | t->language = get_unaligned_le16(data); | |
2275 | t->strings = s; | |
2276 | ++t; | |
2277 | ||
2278 | data += 2; | |
2279 | len -= 2; | |
2280 | ||
2281 | /* For each string */ | |
2282 | do { /* str_count > 0 so we can use do-while */ | |
2283 | size_t length = strnlen(data, len); | |
2284 | ||
2285 | if (unlikely(length == len)) | |
2286 | goto error_free; | |
2287 | ||
5ab54cf7 MN |
2288 | /* |
2289 | * User may provide more strings then we need, | |
2290 | * if that's the case we simply ignore the | |
2291 | * rest | |
2292 | */ | |
ddf8abd2 | 2293 | if (likely(needed)) { |
5ab54cf7 MN |
2294 | /* |
2295 | * s->id will be set while adding | |
ddf8abd2 | 2296 | * function to configuration so for |
5ab54cf7 MN |
2297 | * now just leave garbage here. |
2298 | */ | |
ddf8abd2 MN |
2299 | s->s = data; |
2300 | --needed; | |
2301 | ++s; | |
2302 | } | |
2303 | ||
2304 | data += length + 1; | |
2305 | len -= length + 1; | |
2306 | } while (--str_count); | |
2307 | ||
2308 | s->id = 0; /* terminator */ | |
2309 | s->s = NULL; | |
2310 | ++s; | |
2311 | ||
2312 | } while (--lang_count); | |
2313 | ||
2314 | /* Some garbage left? */ | |
2315 | if (unlikely(len)) | |
2316 | goto error_free; | |
2317 | ||
2318 | /* Done! */ | |
2319 | ffs->stringtabs = stringtabs; | |
2320 | ffs->raw_strings = _data; | |
2321 | ||
2322 | return 0; | |
2323 | ||
2324 | error_free: | |
2325 | kfree(stringtabs); | |
2326 | error: | |
2327 | kfree(_data); | |
2328 | return -EINVAL; | |
2329 | } | |
2330 | ||
2331 | ||
ddf8abd2 MN |
2332 | /* Events handling and management *******************************************/ |
2333 | ||
2334 | static void __ffs_event_add(struct ffs_data *ffs, | |
2335 | enum usb_functionfs_event_type type) | |
2336 | { | |
2337 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; | |
2338 | int neg = 0; | |
2339 | ||
5ab54cf7 MN |
2340 | /* |
2341 | * Abort any unhandled setup | |
2342 | * | |
2343 | * We do not need to worry about some cmpxchg() changing value | |
ddf8abd2 MN |
2344 | * of ffs->setup_state without holding the lock because when |
2345 | * state is FFS_SETUP_PENDING cmpxchg() in several places in | |
5ab54cf7 MN |
2346 | * the source does nothing. |
2347 | */ | |
ddf8abd2 | 2348 | if (ffs->setup_state == FFS_SETUP_PENDING) |
e46318a0 | 2349 | ffs->setup_state = FFS_SETUP_CANCELLED; |
ddf8abd2 MN |
2350 | |
2351 | switch (type) { | |
2352 | case FUNCTIONFS_RESUME: | |
2353 | rem_type2 = FUNCTIONFS_SUSPEND; | |
5ab54cf7 | 2354 | /* FALL THROUGH */ |
ddf8abd2 MN |
2355 | case FUNCTIONFS_SUSPEND: |
2356 | case FUNCTIONFS_SETUP: | |
2357 | rem_type1 = type; | |
5ab54cf7 | 2358 | /* Discard all similar events */ |
ddf8abd2 MN |
2359 | break; |
2360 | ||
2361 | case FUNCTIONFS_BIND: | |
2362 | case FUNCTIONFS_UNBIND: | |
2363 | case FUNCTIONFS_DISABLE: | |
2364 | case FUNCTIONFS_ENABLE: | |
5ab54cf7 | 2365 | /* Discard everything other then power management. */ |
ddf8abd2 MN |
2366 | rem_type1 = FUNCTIONFS_SUSPEND; |
2367 | rem_type2 = FUNCTIONFS_RESUME; | |
2368 | neg = 1; | |
2369 | break; | |
2370 | ||
2371 | default: | |
fe00bcbf MN |
2372 | WARN(1, "%d: unknown event, this should not happen\n", type); |
2373 | return; | |
ddf8abd2 MN |
2374 | } |
2375 | ||
2376 | { | |
2377 | u8 *ev = ffs->ev.types, *out = ev; | |
2378 | unsigned n = ffs->ev.count; | |
2379 | for (; n; --n, ++ev) | |
2380 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) | |
2381 | *out++ = *ev; | |
2382 | else | |
aa02f172 | 2383 | pr_vdebug("purging event %d\n", *ev); |
ddf8abd2 MN |
2384 | ffs->ev.count = out - ffs->ev.types; |
2385 | } | |
2386 | ||
aa02f172 | 2387 | pr_vdebug("adding event %d\n", type); |
ddf8abd2 MN |
2388 | ffs->ev.types[ffs->ev.count++] = type; |
2389 | wake_up_locked(&ffs->ev.waitq); | |
2390 | } | |
2391 | ||
2392 | static void ffs_event_add(struct ffs_data *ffs, | |
2393 | enum usb_functionfs_event_type type) | |
2394 | { | |
2395 | unsigned long flags; | |
2396 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2397 | __ffs_event_add(ffs, type); | |
2398 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2399 | } | |
2400 | ||
ddf8abd2 MN |
2401 | /* Bind/unbind USB function hooks *******************************************/ |
2402 | ||
6d5c1c77 RB |
2403 | static int ffs_ep_addr2idx(struct ffs_data *ffs, u8 endpoint_address) |
2404 | { | |
2405 | int i; | |
2406 | ||
2407 | for (i = 1; i < ARRAY_SIZE(ffs->eps_addrmap); ++i) | |
2408 | if (ffs->eps_addrmap[i] == endpoint_address) | |
2409 | return i; | |
2410 | return -ENOENT; | |
2411 | } | |
2412 | ||
ddf8abd2 MN |
2413 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, |
2414 | struct usb_descriptor_header *desc, | |
2415 | void *priv) | |
2416 | { | |
2417 | struct usb_endpoint_descriptor *ds = (void *)desc; | |
2418 | struct ffs_function *func = priv; | |
2419 | struct ffs_ep *ffs_ep; | |
85b06f5e DC |
2420 | unsigned ep_desc_id; |
2421 | int idx; | |
8d4e897b | 2422 | static const char *speed_names[] = { "full", "high", "super" }; |
ddf8abd2 MN |
2423 | |
2424 | if (type != FFS_DESCRIPTOR) | |
2425 | return 0; | |
2426 | ||
8d4e897b MG |
2427 | /* |
2428 | * If ss_descriptors is not NULL, we are reading super speed | |
2429 | * descriptors; if hs_descriptors is not NULL, we are reading high | |
2430 | * speed descriptors; otherwise, we are reading full speed | |
2431 | * descriptors. | |
2432 | */ | |
2433 | if (func->function.ss_descriptors) { | |
2434 | ep_desc_id = 2; | |
2435 | func->function.ss_descriptors[(long)valuep] = desc; | |
2436 | } else if (func->function.hs_descriptors) { | |
2437 | ep_desc_id = 1; | |
ddf8abd2 | 2438 | func->function.hs_descriptors[(long)valuep] = desc; |
8d4e897b MG |
2439 | } else { |
2440 | ep_desc_id = 0; | |
10287bae | 2441 | func->function.fs_descriptors[(long)valuep] = desc; |
8d4e897b | 2442 | } |
ddf8abd2 MN |
2443 | |
2444 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) | |
2445 | return 0; | |
2446 | ||
6d5c1c77 RB |
2447 | idx = ffs_ep_addr2idx(func->ffs, ds->bEndpointAddress) - 1; |
2448 | if (idx < 0) | |
2449 | return idx; | |
2450 | ||
ddf8abd2 MN |
2451 | ffs_ep = func->eps + idx; |
2452 | ||
8d4e897b MG |
2453 | if (unlikely(ffs_ep->descs[ep_desc_id])) { |
2454 | pr_err("two %sspeed descriptors for EP %d\n", | |
2455 | speed_names[ep_desc_id], | |
d8df0b61 | 2456 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
ddf8abd2 MN |
2457 | return -EINVAL; |
2458 | } | |
8d4e897b | 2459 | ffs_ep->descs[ep_desc_id] = ds; |
ddf8abd2 MN |
2460 | |
2461 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); | |
2462 | if (ffs_ep->ep) { | |
2463 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; | |
2464 | if (!ds->wMaxPacketSize) | |
2465 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; | |
2466 | } else { | |
2467 | struct usb_request *req; | |
2468 | struct usb_ep *ep; | |
2469 | ||
aa02f172 | 2470 | pr_vdebug("autoconfig\n"); |
ddf8abd2 MN |
2471 | ep = usb_ep_autoconfig(func->gadget, ds); |
2472 | if (unlikely(!ep)) | |
2473 | return -ENOTSUPP; | |
cc7e6056 | 2474 | ep->driver_data = func->eps + idx; |
ddf8abd2 MN |
2475 | |
2476 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
2477 | if (unlikely(!req)) | |
2478 | return -ENOMEM; | |
2479 | ||
2480 | ffs_ep->ep = ep; | |
2481 | ffs_ep->req = req; | |
2482 | func->eps_revmap[ds->bEndpointAddress & | |
2483 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; | |
2484 | } | |
2485 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); | |
2486 | ||
2487 | return 0; | |
2488 | } | |
2489 | ||
ddf8abd2 MN |
2490 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, |
2491 | struct usb_descriptor_header *desc, | |
2492 | void *priv) | |
2493 | { | |
2494 | struct ffs_function *func = priv; | |
2495 | unsigned idx; | |
2496 | u8 newValue; | |
2497 | ||
2498 | switch (type) { | |
2499 | default: | |
2500 | case FFS_DESCRIPTOR: | |
2501 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ | |
2502 | return 0; | |
2503 | ||
2504 | case FFS_INTERFACE: | |
2505 | idx = *valuep; | |
2506 | if (func->interfaces_nums[idx] < 0) { | |
2507 | int id = usb_interface_id(func->conf, &func->function); | |
2508 | if (unlikely(id < 0)) | |
2509 | return id; | |
2510 | func->interfaces_nums[idx] = id; | |
2511 | } | |
2512 | newValue = func->interfaces_nums[idx]; | |
2513 | break; | |
2514 | ||
2515 | case FFS_STRING: | |
2516 | /* String' IDs are allocated when fsf_data is bound to cdev */ | |
2517 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; | |
2518 | break; | |
2519 | ||
2520 | case FFS_ENDPOINT: | |
5ab54cf7 MN |
2521 | /* |
2522 | * USB_DT_ENDPOINT are handled in | |
2523 | * __ffs_func_bind_do_descs(). | |
2524 | */ | |
ddf8abd2 MN |
2525 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
2526 | return 0; | |
2527 | ||
2528 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2529 | if (unlikely(!func->eps[idx].ep)) | |
2530 | return -EINVAL; | |
2531 | ||
2532 | { | |
2533 | struct usb_endpoint_descriptor **descs; | |
2534 | descs = func->eps[idx].descs; | |
2535 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; | |
2536 | } | |
2537 | break; | |
2538 | } | |
2539 | ||
aa02f172 | 2540 | pr_vdebug("%02x -> %02x\n", *valuep, newValue); |
ddf8abd2 MN |
2541 | *valuep = newValue; |
2542 | return 0; | |
2543 | } | |
2544 | ||
f0175ab5 AP |
2545 | static int __ffs_func_bind_do_os_desc(enum ffs_os_desc_type type, |
2546 | struct usb_os_desc_header *h, void *data, | |
2547 | unsigned len, void *priv) | |
2548 | { | |
2549 | struct ffs_function *func = priv; | |
2550 | u8 length = 0; | |
2551 | ||
2552 | switch (type) { | |
2553 | case FFS_OS_DESC_EXT_COMPAT: { | |
2554 | struct usb_ext_compat_desc *desc = data; | |
2555 | struct usb_os_desc_table *t; | |
2556 | ||
2557 | t = &func->function.os_desc_table[desc->bFirstInterfaceNumber]; | |
2558 | t->if_id = func->interfaces_nums[desc->bFirstInterfaceNumber]; | |
2559 | memcpy(t->os_desc->ext_compat_id, &desc->CompatibleID, | |
2560 | ARRAY_SIZE(desc->CompatibleID) + | |
2561 | ARRAY_SIZE(desc->SubCompatibleID)); | |
2562 | length = sizeof(*desc); | |
2563 | } | |
2564 | break; | |
2565 | case FFS_OS_DESC_EXT_PROP: { | |
2566 | struct usb_ext_prop_desc *desc = data; | |
2567 | struct usb_os_desc_table *t; | |
2568 | struct usb_os_desc_ext_prop *ext_prop; | |
2569 | char *ext_prop_name; | |
2570 | char *ext_prop_data; | |
2571 | ||
2572 | t = &func->function.os_desc_table[h->interface]; | |
2573 | t->if_id = func->interfaces_nums[h->interface]; | |
2574 | ||
2575 | ext_prop = func->ffs->ms_os_descs_ext_prop_avail; | |
2576 | func->ffs->ms_os_descs_ext_prop_avail += sizeof(*ext_prop); | |
2577 | ||
2578 | ext_prop->type = le32_to_cpu(desc->dwPropertyDataType); | |
2579 | ext_prop->name_len = le16_to_cpu(desc->wPropertyNameLength); | |
2580 | ext_prop->data_len = le32_to_cpu(*(u32 *) | |
2581 | usb_ext_prop_data_len_ptr(data, ext_prop->name_len)); | |
2582 | length = ext_prop->name_len + ext_prop->data_len + 14; | |
2583 | ||
2584 | ext_prop_name = func->ffs->ms_os_descs_ext_prop_name_avail; | |
2585 | func->ffs->ms_os_descs_ext_prop_name_avail += | |
2586 | ext_prop->name_len; | |
2587 | ||
2588 | ext_prop_data = func->ffs->ms_os_descs_ext_prop_data_avail; | |
2589 | func->ffs->ms_os_descs_ext_prop_data_avail += | |
2590 | ext_prop->data_len; | |
2591 | memcpy(ext_prop_data, | |
2592 | usb_ext_prop_data_ptr(data, ext_prop->name_len), | |
2593 | ext_prop->data_len); | |
2594 | /* unicode data reported to the host as "WCHAR"s */ | |
2595 | switch (ext_prop->type) { | |
2596 | case USB_EXT_PROP_UNICODE: | |
2597 | case USB_EXT_PROP_UNICODE_ENV: | |
2598 | case USB_EXT_PROP_UNICODE_LINK: | |
2599 | case USB_EXT_PROP_UNICODE_MULTI: | |
2600 | ext_prop->data_len *= 2; | |
2601 | break; | |
2602 | } | |
2603 | ext_prop->data = ext_prop_data; | |
2604 | ||
2605 | memcpy(ext_prop_name, usb_ext_prop_name_ptr(data), | |
2606 | ext_prop->name_len); | |
2607 | /* property name reported to the host as "WCHAR"s */ | |
2608 | ext_prop->name_len *= 2; | |
2609 | ext_prop->name = ext_prop_name; | |
2610 | ||
2611 | t->os_desc->ext_prop_len += | |
2612 | ext_prop->name_len + ext_prop->data_len + 14; | |
2613 | ++t->os_desc->ext_prop_count; | |
2614 | list_add_tail(&ext_prop->entry, &t->os_desc->ext_prop); | |
2615 | } | |
2616 | break; | |
2617 | default: | |
2618 | pr_vdebug("unknown descriptor: %d\n", type); | |
2619 | } | |
2620 | ||
2621 | return length; | |
2622 | } | |
2623 | ||
5920cda6 AP |
2624 | static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, |
2625 | struct usb_configuration *c) | |
2626 | { | |
2627 | struct ffs_function *func = ffs_func_from_usb(f); | |
2628 | struct f_fs_opts *ffs_opts = | |
2629 | container_of(f->fi, struct f_fs_opts, func_inst); | |
2630 | int ret; | |
2631 | ||
2632 | ENTER(); | |
2633 | ||
2634 | /* | |
2635 | * Legacy gadget triggers binding in functionfs_ready_callback, | |
2636 | * which already uses locking; taking the same lock here would | |
2637 | * cause a deadlock. | |
2638 | * | |
2639 | * Configfs-enabled gadgets however do need ffs_dev_lock. | |
2640 | */ | |
2641 | if (!ffs_opts->no_configfs) | |
2642 | ffs_dev_lock(); | |
2643 | ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; | |
2644 | func->ffs = ffs_opts->dev->ffs_data; | |
2645 | if (!ffs_opts->no_configfs) | |
2646 | ffs_dev_unlock(); | |
2647 | if (ret) | |
2648 | return ERR_PTR(ret); | |
2649 | ||
2650 | func->conf = c; | |
2651 | func->gadget = c->cdev->gadget; | |
2652 | ||
2653 | ffs_data_get(func->ffs); | |
2654 | ||
2655 | /* | |
2656 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
2657 | * configurations are bound in sequence with list_for_each_entry, | |
2658 | * in each configuration its functions are bound in sequence | |
2659 | * with list_for_each_entry, so we assume no race condition | |
2660 | * with regard to ffs_opts->bound access | |
2661 | */ | |
2662 | if (!ffs_opts->refcnt) { | |
2663 | ret = functionfs_bind(func->ffs, c->cdev); | |
2664 | if (ret) | |
2665 | return ERR_PTR(ret); | |
2666 | } | |
2667 | ffs_opts->refcnt++; | |
2668 | func->function.strings = func->ffs->stringtabs; | |
2669 | ||
2670 | return ffs_opts; | |
2671 | } | |
5920cda6 AP |
2672 | |
2673 | static int _ffs_func_bind(struct usb_configuration *c, | |
2674 | struct usb_function *f) | |
ddf8abd2 MN |
2675 | { |
2676 | struct ffs_function *func = ffs_func_from_usb(f); | |
2677 | struct ffs_data *ffs = func->ffs; | |
2678 | ||
2679 | const int full = !!func->ffs->fs_descs_count; | |
2680 | const int high = gadget_is_dualspeed(func->gadget) && | |
2681 | func->ffs->hs_descs_count; | |
8d4e897b MG |
2682 | const int super = gadget_is_superspeed(func->gadget) && |
2683 | func->ffs->ss_descs_count; | |
ddf8abd2 | 2684 | |
f0175ab5 | 2685 | int fs_len, hs_len, ss_len, ret, i; |
ddf8abd2 MN |
2686 | |
2687 | /* Make it a single chunk, less management later on */ | |
e6f3862f AP |
2688 | vla_group(d); |
2689 | vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); | |
2690 | vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, | |
2691 | full ? ffs->fs_descs_count + 1 : 0); | |
2692 | vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, | |
2693 | high ? ffs->hs_descs_count + 1 : 0); | |
8d4e897b MG |
2694 | vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, |
2695 | super ? ffs->ss_descs_count + 1 : 0); | |
e6f3862f | 2696 | vla_item_with_sz(d, short, inums, ffs->interfaces_count); |
f0175ab5 AP |
2697 | vla_item_with_sz(d, struct usb_os_desc_table, os_desc_table, |
2698 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2699 | vla_item_with_sz(d, char[16], ext_compat, | |
2700 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2701 | vla_item_with_sz(d, struct usb_os_desc, os_desc, | |
2702 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2703 | vla_item_with_sz(d, struct usb_os_desc_ext_prop, ext_prop, | |
2704 | ffs->ms_os_descs_ext_prop_count); | |
2705 | vla_item_with_sz(d, char, ext_prop_name, | |
2706 | ffs->ms_os_descs_ext_prop_name_len); | |
2707 | vla_item_with_sz(d, char, ext_prop_data, | |
2708 | ffs->ms_os_descs_ext_prop_data_len); | |
ac8dde11 | 2709 | vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); |
e6f3862f | 2710 | char *vlabuf; |
ddf8abd2 MN |
2711 | |
2712 | ENTER(); | |
2713 | ||
8d4e897b MG |
2714 | /* Has descriptors only for speeds gadget does not support */ |
2715 | if (unlikely(!(full | high | super))) | |
ddf8abd2 MN |
2716 | return -ENOTSUPP; |
2717 | ||
e6f3862f | 2718 | /* Allocate a single chunk, less management later on */ |
f0175ab5 | 2719 | vlabuf = kzalloc(vla_group_size(d), GFP_KERNEL); |
e6f3862f | 2720 | if (unlikely(!vlabuf)) |
ddf8abd2 MN |
2721 | return -ENOMEM; |
2722 | ||
f0175ab5 AP |
2723 | ffs->ms_os_descs_ext_prop_avail = vla_ptr(vlabuf, d, ext_prop); |
2724 | ffs->ms_os_descs_ext_prop_name_avail = | |
2725 | vla_ptr(vlabuf, d, ext_prop_name); | |
2726 | ffs->ms_os_descs_ext_prop_data_avail = | |
2727 | vla_ptr(vlabuf, d, ext_prop_data); | |
2728 | ||
ac8dde11 MN |
2729 | /* Copy descriptors */ |
2730 | memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, | |
2731 | ffs->raw_descs_length); | |
8d4e897b | 2732 | |
e6f3862f AP |
2733 | memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); |
2734 | for (ret = ffs->eps_count; ret; --ret) { | |
2735 | struct ffs_ep *ptr; | |
2736 | ||
2737 | ptr = vla_ptr(vlabuf, d, eps); | |
2738 | ptr[ret].num = -1; | |
2739 | } | |
ddf8abd2 | 2740 | |
e6f3862f AP |
2741 | /* Save pointers |
2742 | * d_eps == vlabuf, func->eps used to kfree vlabuf later | |
2743 | */ | |
2744 | func->eps = vla_ptr(vlabuf, d, eps); | |
2745 | func->interfaces_nums = vla_ptr(vlabuf, d, inums); | |
ddf8abd2 | 2746 | |
5ab54cf7 MN |
2747 | /* |
2748 | * Go through all the endpoint descriptors and allocate | |
ddf8abd2 | 2749 | * endpoints first, so that later we can rewrite the endpoint |
5ab54cf7 MN |
2750 | * numbers without worrying that it may be described later on. |
2751 | */ | |
ddf8abd2 | 2752 | if (likely(full)) { |
e6f3862f | 2753 | func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); |
8d4e897b MG |
2754 | fs_len = ffs_do_descs(ffs->fs_descs_count, |
2755 | vla_ptr(vlabuf, d, raw_descs), | |
2756 | d_raw_descs__sz, | |
2757 | __ffs_func_bind_do_descs, func); | |
2758 | if (unlikely(fs_len < 0)) { | |
2759 | ret = fs_len; | |
ddf8abd2 | 2760 | goto error; |
8d4e897b | 2761 | } |
ddf8abd2 | 2762 | } else { |
8d4e897b | 2763 | fs_len = 0; |
ddf8abd2 MN |
2764 | } |
2765 | ||
2766 | if (likely(high)) { | |
e6f3862f | 2767 | func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); |
8d4e897b MG |
2768 | hs_len = ffs_do_descs(ffs->hs_descs_count, |
2769 | vla_ptr(vlabuf, d, raw_descs) + fs_len, | |
2770 | d_raw_descs__sz - fs_len, | |
2771 | __ffs_func_bind_do_descs, func); | |
2772 | if (unlikely(hs_len < 0)) { | |
2773 | ret = hs_len; | |
2774 | goto error; | |
2775 | } | |
2776 | } else { | |
2777 | hs_len = 0; | |
2778 | } | |
2779 | ||
2780 | if (likely(super)) { | |
2781 | func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); | |
f0175ab5 | 2782 | ss_len = ffs_do_descs(ffs->ss_descs_count, |
8d4e897b MG |
2783 | vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, |
2784 | d_raw_descs__sz - fs_len - hs_len, | |
2785 | __ffs_func_bind_do_descs, func); | |
f0175ab5 AP |
2786 | if (unlikely(ss_len < 0)) { |
2787 | ret = ss_len; | |
8854894c | 2788 | goto error; |
f0175ab5 AP |
2789 | } |
2790 | } else { | |
2791 | ss_len = 0; | |
ddf8abd2 MN |
2792 | } |
2793 | ||
5ab54cf7 MN |
2794 | /* |
2795 | * Now handle interface numbers allocation and interface and | |
2796 | * endpoint numbers rewriting. We can do that in one go | |
2797 | * now. | |
2798 | */ | |
ddf8abd2 | 2799 | ret = ffs_do_descs(ffs->fs_descs_count + |
8d4e897b MG |
2800 | (high ? ffs->hs_descs_count : 0) + |
2801 | (super ? ffs->ss_descs_count : 0), | |
e6f3862f | 2802 | vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, |
ddf8abd2 MN |
2803 | __ffs_func_bind_do_nums, func); |
2804 | if (unlikely(ret < 0)) | |
2805 | goto error; | |
2806 | ||
f0175ab5 AP |
2807 | func->function.os_desc_table = vla_ptr(vlabuf, d, os_desc_table); |
2808 | if (c->cdev->use_os_string) | |
2809 | for (i = 0; i < ffs->interfaces_count; ++i) { | |
2810 | struct usb_os_desc *desc; | |
2811 | ||
2812 | desc = func->function.os_desc_table[i].os_desc = | |
2813 | vla_ptr(vlabuf, d, os_desc) + | |
2814 | i * sizeof(struct usb_os_desc); | |
2815 | desc->ext_compat_id = | |
2816 | vla_ptr(vlabuf, d, ext_compat) + i * 16; | |
2817 | INIT_LIST_HEAD(&desc->ext_prop); | |
2818 | } | |
2819 | ret = ffs_do_os_descs(ffs->ms_os_descs_count, | |
2820 | vla_ptr(vlabuf, d, raw_descs) + | |
2821 | fs_len + hs_len + ss_len, | |
2822 | d_raw_descs__sz - fs_len - hs_len - ss_len, | |
2823 | __ffs_func_bind_do_os_desc, func); | |
2824 | if (unlikely(ret < 0)) | |
2825 | goto error; | |
2826 | func->function.os_desc_n = | |
2827 | c->cdev->use_os_string ? ffs->interfaces_count : 0; | |
2828 | ||
ddf8abd2 MN |
2829 | /* And we're done */ |
2830 | ffs_event_add(ffs, FUNCTIONFS_BIND); | |
2831 | return 0; | |
2832 | ||
2833 | error: | |
2834 | /* XXX Do we need to release all claimed endpoints here? */ | |
2835 | return ret; | |
2836 | } | |
2837 | ||
5920cda6 AP |
2838 | static int ffs_func_bind(struct usb_configuration *c, |
2839 | struct usb_function *f) | |
2840 | { | |
5920cda6 AP |
2841 | struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); |
2842 | ||
2843 | if (IS_ERR(ffs_opts)) | |
2844 | return PTR_ERR(ffs_opts); | |
5920cda6 AP |
2845 | |
2846 | return _ffs_func_bind(c, f); | |
2847 | } | |
2848 | ||
ddf8abd2 MN |
2849 | |
2850 | /* Other USB function hooks *************************************************/ | |
2851 | ||
ddf8abd2 MN |
2852 | static int ffs_func_set_alt(struct usb_function *f, |
2853 | unsigned interface, unsigned alt) | |
2854 | { | |
2855 | struct ffs_function *func = ffs_func_from_usb(f); | |
2856 | struct ffs_data *ffs = func->ffs; | |
2857 | int ret = 0, intf; | |
2858 | ||
2859 | if (alt != (unsigned)-1) { | |
2860 | intf = ffs_func_revmap_intf(func, interface); | |
2861 | if (unlikely(intf < 0)) | |
2862 | return intf; | |
2863 | } | |
2864 | ||
2865 | if (ffs->func) | |
2866 | ffs_func_eps_disable(ffs->func); | |
2867 | ||
2868 | if (ffs->state != FFS_ACTIVE) | |
2869 | return -ENODEV; | |
2870 | ||
2871 | if (alt == (unsigned)-1) { | |
2872 | ffs->func = NULL; | |
2873 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); | |
2874 | return 0; | |
2875 | } | |
2876 | ||
2877 | ffs->func = func; | |
2878 | ret = ffs_func_eps_enable(func); | |
2879 | if (likely(ret >= 0)) | |
2880 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); | |
2881 | return ret; | |
2882 | } | |
2883 | ||
2884 | static void ffs_func_disable(struct usb_function *f) | |
2885 | { | |
2886 | ffs_func_set_alt(f, 0, (unsigned)-1); | |
2887 | } | |
2888 | ||
2889 | static int ffs_func_setup(struct usb_function *f, | |
2890 | const struct usb_ctrlrequest *creq) | |
2891 | { | |
2892 | struct ffs_function *func = ffs_func_from_usb(f); | |
2893 | struct ffs_data *ffs = func->ffs; | |
2894 | unsigned long flags; | |
2895 | int ret; | |
2896 | ||
2897 | ENTER(); | |
2898 | ||
aa02f172 MN |
2899 | pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); |
2900 | pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); | |
2901 | pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); | |
2902 | pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); | |
2903 | pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); | |
ddf8abd2 | 2904 | |
5ab54cf7 MN |
2905 | /* |
2906 | * Most requests directed to interface go through here | |
ddf8abd2 MN |
2907 | * (notable exceptions are set/get interface) so we need to |
2908 | * handle them. All other either handled by composite or | |
2909 | * passed to usb_configuration->setup() (if one is set). No | |
2910 | * matter, we will handle requests directed to endpoint here | |
2911 | * as well (as it's straightforward) but what to do with any | |
5ab54cf7 MN |
2912 | * other request? |
2913 | */ | |
ddf8abd2 MN |
2914 | if (ffs->state != FFS_ACTIVE) |
2915 | return -ENODEV; | |
2916 | ||
2917 | switch (creq->bRequestType & USB_RECIP_MASK) { | |
2918 | case USB_RECIP_INTERFACE: | |
2919 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); | |
2920 | if (unlikely(ret < 0)) | |
2921 | return ret; | |
2922 | break; | |
2923 | ||
2924 | case USB_RECIP_ENDPOINT: | |
2925 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); | |
2926 | if (unlikely(ret < 0)) | |
2927 | return ret; | |
2928 | break; | |
2929 | ||
2930 | default: | |
2931 | return -EOPNOTSUPP; | |
2932 | } | |
2933 | ||
2934 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2935 | ffs->ev.setup = *creq; | |
2936 | ffs->ev.setup.wIndex = cpu_to_le16(ret); | |
2937 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); | |
2938 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2939 | ||
2940 | return 0; | |
2941 | } | |
2942 | ||
2943 | static void ffs_func_suspend(struct usb_function *f) | |
2944 | { | |
2945 | ENTER(); | |
2946 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); | |
2947 | } | |
2948 | ||
2949 | static void ffs_func_resume(struct usb_function *f) | |
2950 | { | |
2951 | ENTER(); | |
2952 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); | |
2953 | } | |
2954 | ||
2955 | ||
5ab54cf7 | 2956 | /* Endpoint and interface numbers reverse mapping ***************************/ |
ddf8abd2 MN |
2957 | |
2958 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) | |
2959 | { | |
2960 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; | |
2961 | return num ? num : -EDOM; | |
2962 | } | |
2963 | ||
2964 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) | |
2965 | { | |
2966 | short *nums = func->interfaces_nums; | |
2967 | unsigned count = func->ffs->interfaces_count; | |
2968 | ||
2969 | for (; count; --count, ++nums) { | |
2970 | if (*nums >= 0 && *nums == intf) | |
2971 | return nums - func->interfaces_nums; | |
2972 | } | |
2973 | ||
2974 | return -EDOM; | |
2975 | } | |
2976 | ||
2977 | ||
4b187fce AP |
2978 | /* Devices management *******************************************************/ |
2979 | ||
2980 | static LIST_HEAD(ffs_devices); | |
2981 | ||
da13a773 | 2982 | static struct ffs_dev *_ffs_do_find_dev(const char *name) |
4b187fce AP |
2983 | { |
2984 | struct ffs_dev *dev; | |
2985 | ||
2986 | list_for_each_entry(dev, &ffs_devices, entry) { | |
2987 | if (!dev->name || !name) | |
2988 | continue; | |
2989 | if (strcmp(dev->name, name) == 0) | |
2990 | return dev; | |
2991 | } | |
b658499f | 2992 | |
4b187fce AP |
2993 | return NULL; |
2994 | } | |
2995 | ||
2996 | /* | |
2997 | * ffs_lock must be taken by the caller of this function | |
2998 | */ | |
da13a773 | 2999 | static struct ffs_dev *_ffs_get_single_dev(void) |
4b187fce AP |
3000 | { |
3001 | struct ffs_dev *dev; | |
3002 | ||
3003 | if (list_is_singular(&ffs_devices)) { | |
3004 | dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); | |
3005 | if (dev->single) | |
3006 | return dev; | |
3007 | } | |
3008 | ||
3009 | return NULL; | |
3010 | } | |
3011 | ||
3012 | /* | |
3013 | * ffs_lock must be taken by the caller of this function | |
3014 | */ | |
da13a773 | 3015 | static struct ffs_dev *_ffs_find_dev(const char *name) |
4b187fce AP |
3016 | { |
3017 | struct ffs_dev *dev; | |
3018 | ||
da13a773 | 3019 | dev = _ffs_get_single_dev(); |
4b187fce AP |
3020 | if (dev) |
3021 | return dev; | |
3022 | ||
da13a773 | 3023 | return _ffs_do_find_dev(name); |
4b187fce AP |
3024 | } |
3025 | ||
b658499f AP |
3026 | /* Configfs support *********************************************************/ |
3027 | ||
3028 | static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) | |
3029 | { | |
3030 | return container_of(to_config_group(item), struct f_fs_opts, | |
3031 | func_inst.group); | |
3032 | } | |
3033 | ||
3034 | static void ffs_attr_release(struct config_item *item) | |
3035 | { | |
3036 | struct f_fs_opts *opts = to_ffs_opts(item); | |
3037 | ||
3038 | usb_put_function_instance(&opts->func_inst); | |
3039 | } | |
3040 | ||
3041 | static struct configfs_item_operations ffs_item_ops = { | |
3042 | .release = ffs_attr_release, | |
3043 | }; | |
3044 | ||
3045 | static struct config_item_type ffs_func_type = { | |
3046 | .ct_item_ops = &ffs_item_ops, | |
3047 | .ct_owner = THIS_MODULE, | |
3048 | }; | |
3049 | ||
3050 | ||
5920cda6 AP |
3051 | /* Function registration interface ******************************************/ |
3052 | ||
5920cda6 AP |
3053 | static void ffs_free_inst(struct usb_function_instance *f) |
3054 | { | |
3055 | struct f_fs_opts *opts; | |
3056 | ||
3057 | opts = to_f_fs_opts(f); | |
3058 | ffs_dev_lock(); | |
da13a773 | 3059 | _ffs_free_dev(opts->dev); |
5920cda6 AP |
3060 | ffs_dev_unlock(); |
3061 | kfree(opts); | |
3062 | } | |
3063 | ||
b658499f AP |
3064 | #define MAX_INST_NAME_LEN 40 |
3065 | ||
3066 | static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) | |
3067 | { | |
3068 | struct f_fs_opts *opts; | |
3069 | char *ptr; | |
3070 | const char *tmp; | |
3071 | int name_len, ret; | |
3072 | ||
3073 | name_len = strlen(name) + 1; | |
3074 | if (name_len > MAX_INST_NAME_LEN) | |
3075 | return -ENAMETOOLONG; | |
3076 | ||
3077 | ptr = kstrndup(name, name_len, GFP_KERNEL); | |
3078 | if (!ptr) | |
3079 | return -ENOMEM; | |
3080 | ||
3081 | opts = to_f_fs_opts(fi); | |
3082 | tmp = NULL; | |
3083 | ||
3084 | ffs_dev_lock(); | |
3085 | ||
3086 | tmp = opts->dev->name_allocated ? opts->dev->name : NULL; | |
3087 | ret = _ffs_name_dev(opts->dev, ptr); | |
3088 | if (ret) { | |
3089 | kfree(ptr); | |
3090 | ffs_dev_unlock(); | |
3091 | return ret; | |
3092 | } | |
3093 | opts->dev->name_allocated = true; | |
3094 | ||
3095 | ffs_dev_unlock(); | |
3096 | ||
3097 | kfree(tmp); | |
3098 | ||
3099 | return 0; | |
3100 | } | |
3101 | ||
5920cda6 AP |
3102 | static struct usb_function_instance *ffs_alloc_inst(void) |
3103 | { | |
3104 | struct f_fs_opts *opts; | |
3105 | struct ffs_dev *dev; | |
3106 | ||
3107 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3108 | if (!opts) | |
3109 | return ERR_PTR(-ENOMEM); | |
3110 | ||
b658499f | 3111 | opts->func_inst.set_inst_name = ffs_set_inst_name; |
5920cda6 AP |
3112 | opts->func_inst.free_func_inst = ffs_free_inst; |
3113 | ffs_dev_lock(); | |
da13a773 | 3114 | dev = _ffs_alloc_dev(); |
5920cda6 AP |
3115 | ffs_dev_unlock(); |
3116 | if (IS_ERR(dev)) { | |
3117 | kfree(opts); | |
3118 | return ERR_CAST(dev); | |
3119 | } | |
3120 | opts->dev = dev; | |
b658499f | 3121 | dev->opts = opts; |
5920cda6 | 3122 | |
b658499f AP |
3123 | config_group_init_type_name(&opts->func_inst.group, "", |
3124 | &ffs_func_type); | |
5920cda6 AP |
3125 | return &opts->func_inst; |
3126 | } | |
3127 | ||
3128 | static void ffs_free(struct usb_function *f) | |
3129 | { | |
3130 | kfree(ffs_func_from_usb(f)); | |
3131 | } | |
3132 | ||
3133 | static void ffs_func_unbind(struct usb_configuration *c, | |
3134 | struct usb_function *f) | |
3135 | { | |
3136 | struct ffs_function *func = ffs_func_from_usb(f); | |
3137 | struct ffs_data *ffs = func->ffs; | |
3138 | struct f_fs_opts *opts = | |
3139 | container_of(f->fi, struct f_fs_opts, func_inst); | |
3140 | struct ffs_ep *ep = func->eps; | |
3141 | unsigned count = ffs->eps_count; | |
3142 | unsigned long flags; | |
3143 | ||
3144 | ENTER(); | |
3145 | if (ffs->func == func) { | |
3146 | ffs_func_eps_disable(func); | |
3147 | ffs->func = NULL; | |
3148 | } | |
3149 | ||
3150 | if (!--opts->refcnt) | |
3151 | functionfs_unbind(ffs); | |
3152 | ||
3153 | /* cleanup after autoconfig */ | |
3154 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
3155 | do { | |
3156 | if (ep->ep && ep->req) | |
3157 | usb_ep_free_request(ep->ep, ep->req); | |
3158 | ep->req = NULL; | |
3159 | ++ep; | |
3160 | } while (--count); | |
3161 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
3162 | kfree(func->eps); | |
3163 | func->eps = NULL; | |
3164 | /* | |
3165 | * eps, descriptors and interfaces_nums are allocated in the | |
3166 | * same chunk so only one free is required. | |
3167 | */ | |
3168 | func->function.fs_descriptors = NULL; | |
3169 | func->function.hs_descriptors = NULL; | |
8d4e897b | 3170 | func->function.ss_descriptors = NULL; |
5920cda6 AP |
3171 | func->interfaces_nums = NULL; |
3172 | ||
3173 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); | |
3174 | } | |
3175 | ||
3176 | static struct usb_function *ffs_alloc(struct usb_function_instance *fi) | |
3177 | { | |
3178 | struct ffs_function *func; | |
3179 | ||
3180 | ENTER(); | |
3181 | ||
3182 | func = kzalloc(sizeof(*func), GFP_KERNEL); | |
3183 | if (unlikely(!func)) | |
3184 | return ERR_PTR(-ENOMEM); | |
3185 | ||
3186 | func->function.name = "Function FS Gadget"; | |
3187 | ||
3188 | func->function.bind = ffs_func_bind; | |
3189 | func->function.unbind = ffs_func_unbind; | |
3190 | func->function.set_alt = ffs_func_set_alt; | |
3191 | func->function.disable = ffs_func_disable; | |
3192 | func->function.setup = ffs_func_setup; | |
3193 | func->function.suspend = ffs_func_suspend; | |
3194 | func->function.resume = ffs_func_resume; | |
3195 | func->function.free_func = ffs_free; | |
3196 | ||
3197 | return &func->function; | |
3198 | } | |
3199 | ||
4b187fce AP |
3200 | /* |
3201 | * ffs_lock must be taken by the caller of this function | |
3202 | */ | |
da13a773 | 3203 | static struct ffs_dev *_ffs_alloc_dev(void) |
4b187fce AP |
3204 | { |
3205 | struct ffs_dev *dev; | |
3206 | int ret; | |
3207 | ||
da13a773 | 3208 | if (_ffs_get_single_dev()) |
4b187fce AP |
3209 | return ERR_PTR(-EBUSY); |
3210 | ||
3211 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
3212 | if (!dev) | |
3213 | return ERR_PTR(-ENOMEM); | |
3214 | ||
3215 | if (list_empty(&ffs_devices)) { | |
3216 | ret = functionfs_init(); | |
3217 | if (ret) { | |
3218 | kfree(dev); | |
3219 | return ERR_PTR(ret); | |
3220 | } | |
3221 | } | |
3222 | ||
3223 | list_add(&dev->entry, &ffs_devices); | |
3224 | ||
3225 | return dev; | |
3226 | } | |
3227 | ||
3228 | /* | |
3229 | * ffs_lock must be taken by the caller of this function | |
3230 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3231 | */ | |
3232 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3233 | { | |
3234 | struct ffs_dev *existing; | |
3235 | ||
da13a773 | 3236 | existing = _ffs_do_find_dev(name); |
4b187fce AP |
3237 | if (existing) |
3238 | return -EBUSY; | |
ab13cb0c | 3239 | |
4b187fce AP |
3240 | dev->name = name; |
3241 | ||
3242 | return 0; | |
3243 | } | |
3244 | ||
3245 | /* | |
3246 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3247 | */ | |
3248 | int ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3249 | { | |
3250 | int ret; | |
3251 | ||
3252 | ffs_dev_lock(); | |
3253 | ret = _ffs_name_dev(dev, name); | |
3254 | ffs_dev_unlock(); | |
3255 | ||
3256 | return ret; | |
3257 | } | |
0700faaf | 3258 | EXPORT_SYMBOL_GPL(ffs_name_dev); |
4b187fce AP |
3259 | |
3260 | int ffs_single_dev(struct ffs_dev *dev) | |
3261 | { | |
3262 | int ret; | |
3263 | ||
3264 | ret = 0; | |
3265 | ffs_dev_lock(); | |
3266 | ||
3267 | if (!list_is_singular(&ffs_devices)) | |
3268 | ret = -EBUSY; | |
3269 | else | |
3270 | dev->single = true; | |
3271 | ||
3272 | ffs_dev_unlock(); | |
3273 | return ret; | |
3274 | } | |
0700faaf | 3275 | EXPORT_SYMBOL_GPL(ffs_single_dev); |
4b187fce AP |
3276 | |
3277 | /* | |
3278 | * ffs_lock must be taken by the caller of this function | |
3279 | */ | |
da13a773 | 3280 | static void _ffs_free_dev(struct ffs_dev *dev) |
4b187fce AP |
3281 | { |
3282 | list_del(&dev->entry); | |
b658499f AP |
3283 | if (dev->name_allocated) |
3284 | kfree(dev->name); | |
4b187fce AP |
3285 | kfree(dev); |
3286 | if (list_empty(&ffs_devices)) | |
3287 | functionfs_cleanup(); | |
3288 | } | |
3289 | ||
3290 | static void *ffs_acquire_dev(const char *dev_name) | |
3291 | { | |
3292 | struct ffs_dev *ffs_dev; | |
3293 | ||
3294 | ENTER(); | |
3295 | ffs_dev_lock(); | |
3296 | ||
da13a773 | 3297 | ffs_dev = _ffs_find_dev(dev_name); |
4b187fce | 3298 | if (!ffs_dev) |
d668b4f3 | 3299 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3300 | else if (ffs_dev->mounted) |
3301 | ffs_dev = ERR_PTR(-EBUSY); | |
5920cda6 AP |
3302 | else if (ffs_dev->ffs_acquire_dev_callback && |
3303 | ffs_dev->ffs_acquire_dev_callback(ffs_dev)) | |
d668b4f3 | 3304 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3305 | else |
3306 | ffs_dev->mounted = true; | |
3307 | ||
3308 | ffs_dev_unlock(); | |
3309 | return ffs_dev; | |
3310 | } | |
3311 | ||
3312 | static void ffs_release_dev(struct ffs_data *ffs_data) | |
3313 | { | |
3314 | struct ffs_dev *ffs_dev; | |
3315 | ||
3316 | ENTER(); | |
3317 | ffs_dev_lock(); | |
3318 | ||
3319 | ffs_dev = ffs_data->private_data; | |
ea365922 | 3320 | if (ffs_dev) { |
4b187fce | 3321 | ffs_dev->mounted = false; |
ea365922 AP |
3322 | |
3323 | if (ffs_dev->ffs_release_dev_callback) | |
3324 | ffs_dev->ffs_release_dev_callback(ffs_dev); | |
3325 | } | |
4b187fce AP |
3326 | |
3327 | ffs_dev_unlock(); | |
3328 | } | |
3329 | ||
3330 | static int ffs_ready(struct ffs_data *ffs) | |
3331 | { | |
3332 | struct ffs_dev *ffs_obj; | |
3333 | int ret = 0; | |
3334 | ||
3335 | ENTER(); | |
3336 | ffs_dev_lock(); | |
3337 | ||
3338 | ffs_obj = ffs->private_data; | |
3339 | if (!ffs_obj) { | |
3340 | ret = -EINVAL; | |
3341 | goto done; | |
3342 | } | |
3343 | if (WARN_ON(ffs_obj->desc_ready)) { | |
3344 | ret = -EBUSY; | |
3345 | goto done; | |
3346 | } | |
3347 | ||
3348 | ffs_obj->desc_ready = true; | |
3349 | ffs_obj->ffs_data = ffs; | |
3350 | ||
3351 | if (ffs_obj->ffs_ready_callback) | |
3352 | ret = ffs_obj->ffs_ready_callback(ffs); | |
3353 | ||
3354 | done: | |
3355 | ffs_dev_unlock(); | |
3356 | return ret; | |
3357 | } | |
3358 | ||
3359 | static void ffs_closed(struct ffs_data *ffs) | |
3360 | { | |
3361 | struct ffs_dev *ffs_obj; | |
3362 | ||
3363 | ENTER(); | |
3364 | ffs_dev_lock(); | |
3365 | ||
3366 | ffs_obj = ffs->private_data; | |
3367 | if (!ffs_obj) | |
3368 | goto done; | |
3369 | ||
3370 | ffs_obj->desc_ready = false; | |
3371 | ||
3372 | if (ffs_obj->ffs_closed_callback) | |
3373 | ffs_obj->ffs_closed_callback(ffs); | |
b658499f AP |
3374 | |
3375 | if (!ffs_obj->opts || ffs_obj->opts->no_configfs | |
3376 | || !ffs_obj->opts->func_inst.group.cg_item.ci_parent) | |
3377 | goto done; | |
3378 | ||
3379 | unregister_gadget_item(ffs_obj->opts-> | |
3380 | func_inst.group.cg_item.ci_parent->ci_parent); | |
4b187fce AP |
3381 | done: |
3382 | ffs_dev_unlock(); | |
3383 | } | |
3384 | ||
ddf8abd2 MN |
3385 | /* Misc helper functions ****************************************************/ |
3386 | ||
3387 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
3388 | { | |
3389 | return nonblock | |
3390 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN | |
3391 | : mutex_lock_interruptible(mutex); | |
3392 | } | |
3393 | ||
260ef311 | 3394 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
3395 | { |
3396 | char *data; | |
3397 | ||
3398 | if (unlikely(!len)) | |
3399 | return NULL; | |
3400 | ||
3401 | data = kmalloc(len, GFP_KERNEL); | |
3402 | if (unlikely(!data)) | |
3403 | return ERR_PTR(-ENOMEM); | |
3404 | ||
3405 | if (unlikely(__copy_from_user(data, buf, len))) { | |
3406 | kfree(data); | |
3407 | return ERR_PTR(-EFAULT); | |
3408 | } | |
3409 | ||
aa02f172 | 3410 | pr_vdebug("Buffer from user space:\n"); |
ddf8abd2 MN |
3411 | ffs_dump_mem("", data, len); |
3412 | ||
3413 | return data; | |
3414 | } | |
5920cda6 | 3415 | |
5920cda6 AP |
3416 | DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc); |
3417 | MODULE_LICENSE("GPL"); | |
3418 | MODULE_AUTHOR("Michal Nazarewicz"); |