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 | 33 | #include <linux/poll.h> |
5e33f6fd | 34 | #include <linux/eventfd.h> |
23de91e9 | 35 | |
e72c39c0 | 36 | #include "u_fs.h" |
74d48466 | 37 | #include "u_f.h" |
f0175ab5 | 38 | #include "u_os_desc.h" |
b658499f | 39 | #include "configfs.h" |
ddf8abd2 MN |
40 | |
41 | #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ | |
42 | ||
ddf8abd2 MN |
43 | /* Reference counter handling */ |
44 | static void ffs_data_get(struct ffs_data *ffs); | |
45 | static void ffs_data_put(struct ffs_data *ffs); | |
46 | /* Creates new ffs_data object. */ | |
47 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); | |
48 | ||
49 | /* Opened counter handling. */ | |
50 | static void ffs_data_opened(struct ffs_data *ffs); | |
51 | static void ffs_data_closed(struct ffs_data *ffs); | |
52 | ||
5ab54cf7 | 53 | /* Called with ffs->mutex held; take over ownership of data. */ |
ddf8abd2 MN |
54 | static int __must_check |
55 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); | |
56 | static int __must_check | |
57 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); | |
58 | ||
59 | ||
60 | /* The function structure ***************************************************/ | |
61 | ||
62 | struct ffs_ep; | |
63 | ||
64 | struct ffs_function { | |
65 | struct usb_configuration *conf; | |
66 | struct usb_gadget *gadget; | |
67 | struct ffs_data *ffs; | |
68 | ||
69 | struct ffs_ep *eps; | |
70 | u8 eps_revmap[16]; | |
71 | short *interfaces_nums; | |
72 | ||
73 | struct usb_function function; | |
74 | }; | |
75 | ||
76 | ||
77 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) | |
78 | { | |
79 | return container_of(f, struct ffs_function, function); | |
80 | } | |
81 | ||
ddf8abd2 | 82 | |
a7ecf054 MN |
83 | static inline enum ffs_setup_state |
84 | ffs_setup_state_clear_cancelled(struct ffs_data *ffs) | |
85 | { | |
86 | return (enum ffs_setup_state) | |
87 | cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); | |
88 | } | |
89 | ||
90 | ||
ddf8abd2 MN |
91 | static void ffs_func_eps_disable(struct ffs_function *func); |
92 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); | |
93 | ||
ddf8abd2 MN |
94 | static int ffs_func_bind(struct usb_configuration *, |
95 | struct usb_function *); | |
ddf8abd2 MN |
96 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); |
97 | static void ffs_func_disable(struct usb_function *); | |
98 | static int ffs_func_setup(struct usb_function *, | |
99 | const struct usb_ctrlrequest *); | |
100 | static void ffs_func_suspend(struct usb_function *); | |
101 | static void ffs_func_resume(struct usb_function *); | |
102 | ||
103 | ||
104 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); | |
105 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); | |
106 | ||
107 | ||
ddf8abd2 MN |
108 | /* The endpoints structures *************************************************/ |
109 | ||
110 | struct ffs_ep { | |
111 | struct usb_ep *ep; /* P: ffs->eps_lock */ | |
112 | struct usb_request *req; /* P: epfile->mutex */ | |
113 | ||
8d4e897b MG |
114 | /* [0]: full speed, [1]: high speed, [2]: super speed */ |
115 | struct usb_endpoint_descriptor *descs[3]; | |
ddf8abd2 MN |
116 | |
117 | u8 num; | |
118 | ||
119 | int status; /* P: epfile->mutex */ | |
120 | }; | |
121 | ||
122 | struct ffs_epfile { | |
123 | /* Protects ep->ep and ep->req. */ | |
124 | struct mutex mutex; | |
125 | wait_queue_head_t wait; | |
126 | ||
127 | struct ffs_data *ffs; | |
128 | struct ffs_ep *ep; /* P: ffs->eps_lock */ | |
129 | ||
130 | struct dentry *dentry; | |
131 | ||
132 | char name[5]; | |
133 | ||
134 | unsigned char in; /* P: ffs->eps_lock */ | |
135 | unsigned char isoc; /* P: ffs->eps_lock */ | |
136 | ||
137 | unsigned char _pad; | |
138 | }; | |
139 | ||
2e4c7553 RB |
140 | /* ffs_io_data structure ***************************************************/ |
141 | ||
142 | struct ffs_io_data { | |
143 | bool aio; | |
144 | bool read; | |
145 | ||
146 | struct kiocb *kiocb; | |
c993c39b AV |
147 | struct iov_iter data; |
148 | const void *to_free; | |
149 | char *buf; | |
2e4c7553 RB |
150 | |
151 | struct mm_struct *mm; | |
152 | struct work_struct work; | |
153 | ||
154 | struct usb_ep *ep; | |
155 | struct usb_request *req; | |
5e33f6fd RB |
156 | |
157 | struct ffs_data *ffs; | |
2e4c7553 RB |
158 | }; |
159 | ||
6d5c1c77 RB |
160 | struct ffs_desc_helper { |
161 | struct ffs_data *ffs; | |
162 | unsigned interfaces_count; | |
163 | unsigned eps_count; | |
164 | }; | |
165 | ||
ddf8abd2 MN |
166 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
167 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); | |
168 | ||
1bb27cac | 169 | static struct dentry * |
ddf8abd2 | 170 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, |
1bb27cac | 171 | const struct file_operations *fops); |
ddf8abd2 | 172 | |
4b187fce AP |
173 | /* Devices management *******************************************************/ |
174 | ||
175 | DEFINE_MUTEX(ffs_lock); | |
0700faaf | 176 | EXPORT_SYMBOL_GPL(ffs_lock); |
4b187fce | 177 | |
da13a773 AP |
178 | static struct ffs_dev *_ffs_find_dev(const char *name); |
179 | static struct ffs_dev *_ffs_alloc_dev(void); | |
b658499f | 180 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name); |
da13a773 | 181 | static void _ffs_free_dev(struct ffs_dev *dev); |
4b187fce AP |
182 | static void *ffs_acquire_dev(const char *dev_name); |
183 | static void ffs_release_dev(struct ffs_data *ffs_data); | |
184 | static int ffs_ready(struct ffs_data *ffs); | |
185 | static void ffs_closed(struct ffs_data *ffs); | |
ddf8abd2 MN |
186 | |
187 | /* Misc helper functions ****************************************************/ | |
188 | ||
189 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
190 | __attribute__((warn_unused_result, nonnull)); | |
260ef311 | 191 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
192 | __attribute__((warn_unused_result, nonnull)); |
193 | ||
194 | ||
195 | /* Control file aka ep0 *****************************************************/ | |
196 | ||
197 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
198 | { | |
199 | struct ffs_data *ffs = req->context; | |
200 | ||
201 | complete_all(&ffs->ep0req_completion); | |
202 | } | |
203 | ||
ddf8abd2 MN |
204 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
205 | { | |
206 | struct usb_request *req = ffs->ep0req; | |
207 | int ret; | |
208 | ||
209 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); | |
210 | ||
211 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
212 | ||
213 | req->buf = data; | |
214 | req->length = len; | |
215 | ||
ce1fd358 MS |
216 | /* |
217 | * UDC layer requires to provide a buffer even for ZLP, but should | |
218 | * not use it at all. Let's provide some poisoned pointer to catch | |
219 | * possible bug in the driver. | |
220 | */ | |
221 | if (req->buf == NULL) | |
222 | req->buf = (void *)0xDEADBABE; | |
223 | ||
16735d02 | 224 | reinit_completion(&ffs->ep0req_completion); |
ddf8abd2 MN |
225 | |
226 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); | |
227 | if (unlikely(ret < 0)) | |
228 | return ret; | |
229 | ||
230 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); | |
231 | if (unlikely(ret)) { | |
232 | usb_ep_dequeue(ffs->gadget->ep0, req); | |
233 | return -EINTR; | |
234 | } | |
235 | ||
236 | ffs->setup_state = FFS_NO_SETUP; | |
0a7b1f8a | 237 | return req->status ? req->status : req->actual; |
ddf8abd2 MN |
238 | } |
239 | ||
240 | static int __ffs_ep0_stall(struct ffs_data *ffs) | |
241 | { | |
242 | if (ffs->ev.can_stall) { | |
aa02f172 | 243 | pr_vdebug("ep0 stall\n"); |
ddf8abd2 MN |
244 | usb_ep_set_halt(ffs->gadget->ep0); |
245 | ffs->setup_state = FFS_NO_SETUP; | |
246 | return -EL2HLT; | |
247 | } else { | |
aa02f172 | 248 | pr_debug("bogus ep0 stall!\n"); |
ddf8abd2 MN |
249 | return -ESRCH; |
250 | } | |
251 | } | |
252 | ||
ddf8abd2 MN |
253 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
254 | size_t len, loff_t *ptr) | |
255 | { | |
256 | struct ffs_data *ffs = file->private_data; | |
257 | ssize_t ret; | |
258 | char *data; | |
259 | ||
260 | ENTER(); | |
261 | ||
262 | /* Fast check if setup was canceled */ | |
a7ecf054 | 263 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
264 | return -EIDRM; |
265 | ||
266 | /* Acquire mutex */ | |
267 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
268 | if (unlikely(ret < 0)) | |
269 | return ret; | |
270 | ||
ddf8abd2 MN |
271 | /* Check state */ |
272 | switch (ffs->state) { | |
273 | case FFS_READ_DESCRIPTORS: | |
274 | case FFS_READ_STRINGS: | |
275 | /* Copy data */ | |
276 | if (unlikely(len < 16)) { | |
277 | ret = -EINVAL; | |
278 | break; | |
279 | } | |
280 | ||
281 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 282 | if (IS_ERR(data)) { |
ddf8abd2 MN |
283 | ret = PTR_ERR(data); |
284 | break; | |
285 | } | |
286 | ||
287 | /* Handle data */ | |
288 | if (ffs->state == FFS_READ_DESCRIPTORS) { | |
aa02f172 | 289 | pr_info("read descriptors\n"); |
ddf8abd2 MN |
290 | ret = __ffs_data_got_descs(ffs, data, len); |
291 | if (unlikely(ret < 0)) | |
292 | break; | |
293 | ||
294 | ffs->state = FFS_READ_STRINGS; | |
295 | ret = len; | |
296 | } else { | |
aa02f172 | 297 | pr_info("read strings\n"); |
ddf8abd2 MN |
298 | ret = __ffs_data_got_strings(ffs, data, len); |
299 | if (unlikely(ret < 0)) | |
300 | break; | |
301 | ||
302 | ret = ffs_epfiles_create(ffs); | |
303 | if (unlikely(ret)) { | |
304 | ffs->state = FFS_CLOSING; | |
305 | break; | |
306 | } | |
307 | ||
308 | ffs->state = FFS_ACTIVE; | |
309 | mutex_unlock(&ffs->mutex); | |
310 | ||
4b187fce | 311 | ret = ffs_ready(ffs); |
ddf8abd2 MN |
312 | if (unlikely(ret < 0)) { |
313 | ffs->state = FFS_CLOSING; | |
314 | return ret; | |
315 | } | |
316 | ||
317 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); | |
318 | return len; | |
319 | } | |
320 | break; | |
321 | ||
ddf8abd2 MN |
322 | case FFS_ACTIVE: |
323 | data = NULL; | |
5ab54cf7 MN |
324 | /* |
325 | * We're called from user space, we can use _irq | |
326 | * rather then _irqsave | |
327 | */ | |
ddf8abd2 | 328 | spin_lock_irq(&ffs->ev.waitq.lock); |
a7ecf054 | 329 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 330 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
331 | ret = -EIDRM; |
332 | goto done_spin; | |
333 | ||
334 | case FFS_NO_SETUP: | |
335 | ret = -ESRCH; | |
336 | goto done_spin; | |
337 | ||
338 | case FFS_SETUP_PENDING: | |
339 | break; | |
340 | } | |
341 | ||
342 | /* FFS_SETUP_PENDING */ | |
343 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { | |
344 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
345 | ret = __ffs_ep0_stall(ffs); | |
346 | break; | |
347 | } | |
348 | ||
349 | /* FFS_SETUP_PENDING and not stall */ | |
350 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
351 | ||
352 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
353 | ||
354 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 355 | if (IS_ERR(data)) { |
ddf8abd2 MN |
356 | ret = PTR_ERR(data); |
357 | break; | |
358 | } | |
359 | ||
360 | spin_lock_irq(&ffs->ev.waitq.lock); | |
361 | ||
5ab54cf7 MN |
362 | /* |
363 | * We are guaranteed to be still in FFS_ACTIVE state | |
ddf8abd2 | 364 | * but the state of setup could have changed from |
e46318a0 | 365 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELLED so we need |
ddf8abd2 | 366 | * to check for that. If that happened we copied data |
5ab54cf7 MN |
367 | * from user space in vain but it's unlikely. |
368 | * | |
369 | * For sure we are not in FFS_NO_SETUP since this is | |
ddf8abd2 MN |
370 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
371 | * transition can be performed and it's protected by | |
5ab54cf7 MN |
372 | * mutex. |
373 | */ | |
a7ecf054 MN |
374 | if (ffs_setup_state_clear_cancelled(ffs) == |
375 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
376 | ret = -EIDRM; |
377 | done_spin: | |
378 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
379 | } else { | |
380 | /* unlocks spinlock */ | |
381 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
382 | } | |
383 | kfree(data); | |
384 | break; | |
385 | ||
ddf8abd2 MN |
386 | default: |
387 | ret = -EBADFD; | |
388 | break; | |
389 | } | |
390 | ||
ddf8abd2 MN |
391 | mutex_unlock(&ffs->mutex); |
392 | return ret; | |
393 | } | |
394 | ||
67913bbd | 395 | /* Called with ffs->ev.waitq.lock and ffs->mutex held, both released on exit. */ |
ddf8abd2 MN |
396 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, |
397 | size_t n) | |
398 | { | |
5ab54cf7 | 399 | /* |
67913bbd MN |
400 | * n cannot be bigger than ffs->ev.count, which cannot be bigger than |
401 | * size of ffs->ev.types array (which is four) so that's how much space | |
402 | * we reserve. | |
5ab54cf7 | 403 | */ |
67913bbd MN |
404 | struct usb_functionfs_event events[ARRAY_SIZE(ffs->ev.types)]; |
405 | const size_t size = n * sizeof *events; | |
ddf8abd2 MN |
406 | unsigned i = 0; |
407 | ||
67913bbd | 408 | memset(events, 0, size); |
ddf8abd2 MN |
409 | |
410 | do { | |
411 | events[i].type = ffs->ev.types[i]; | |
412 | if (events[i].type == FUNCTIONFS_SETUP) { | |
413 | events[i].u.setup = ffs->ev.setup; | |
414 | ffs->setup_state = FFS_SETUP_PENDING; | |
415 | } | |
416 | } while (++i < n); | |
417 | ||
67913bbd MN |
418 | ffs->ev.count -= n; |
419 | if (ffs->ev.count) | |
ddf8abd2 MN |
420 | memmove(ffs->ev.types, ffs->ev.types + n, |
421 | ffs->ev.count * sizeof *ffs->ev.types); | |
ddf8abd2 MN |
422 | |
423 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
424 | mutex_unlock(&ffs->mutex); | |
425 | ||
67913bbd | 426 | return unlikely(__copy_to_user(buf, events, size)) ? -EFAULT : size; |
ddf8abd2 MN |
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; | |
18d6b32f RB |
610 | case FFS_DEACTIVATED: |
611 | break; | |
23de91e9 RB |
612 | } |
613 | ||
614 | mutex_unlock(&ffs->mutex); | |
615 | ||
616 | return mask; | |
617 | } | |
618 | ||
ddf8abd2 | 619 | static const struct file_operations ffs_ep0_operations = { |
ddf8abd2 MN |
620 | .llseek = no_llseek, |
621 | ||
622 | .open = ffs_ep0_open, | |
623 | .write = ffs_ep0_write, | |
624 | .read = ffs_ep0_read, | |
625 | .release = ffs_ep0_release, | |
626 | .unlocked_ioctl = ffs_ep0_ioctl, | |
23de91e9 | 627 | .poll = ffs_ep0_poll, |
ddf8abd2 MN |
628 | }; |
629 | ||
630 | ||
631 | /* "Normal" endpoints operations ********************************************/ | |
632 | ||
ddf8abd2 MN |
633 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) |
634 | { | |
635 | ENTER(); | |
636 | if (likely(req->context)) { | |
637 | struct ffs_ep *ep = _ep->driver_data; | |
638 | ep->status = req->status ? req->status : req->actual; | |
639 | complete(req->context); | |
640 | } | |
641 | } | |
642 | ||
2e4c7553 RB |
643 | static void ffs_user_copy_worker(struct work_struct *work) |
644 | { | |
645 | struct ffs_io_data *io_data = container_of(work, struct ffs_io_data, | |
646 | work); | |
647 | int ret = io_data->req->status ? io_data->req->status : | |
648 | io_data->req->actual; | |
649 | ||
650 | if (io_data->read && ret > 0) { | |
2e4c7553 | 651 | use_mm(io_data->mm); |
c993c39b AV |
652 | ret = copy_to_iter(io_data->buf, ret, &io_data->data); |
653 | if (iov_iter_count(&io_data->data)) | |
654 | ret = -EFAULT; | |
2e4c7553 RB |
655 | unuse_mm(io_data->mm); |
656 | } | |
657 | ||
658 | aio_complete(io_data->kiocb, ret, ret); | |
659 | ||
5e33f6fd RB |
660 | if (io_data->ffs->ffs_eventfd && !io_data->kiocb->ki_eventfd) |
661 | eventfd_signal(io_data->ffs->ffs_eventfd, 1); | |
662 | ||
2e4c7553 RB |
663 | usb_ep_free_request(io_data->ep, io_data->req); |
664 | ||
665 | io_data->kiocb->private = NULL; | |
666 | if (io_data->read) | |
c993c39b | 667 | kfree(io_data->to_free); |
2e4c7553 RB |
668 | kfree(io_data->buf); |
669 | kfree(io_data); | |
670 | } | |
671 | ||
672 | static void ffs_epfile_async_io_complete(struct usb_ep *_ep, | |
673 | struct usb_request *req) | |
674 | { | |
675 | struct ffs_io_data *io_data = req->context; | |
676 | ||
677 | ENTER(); | |
678 | ||
679 | INIT_WORK(&io_data->work, ffs_user_copy_worker); | |
680 | schedule_work(&io_data->work); | |
681 | } | |
682 | ||
683 | static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data) | |
ddf8abd2 MN |
684 | { |
685 | struct ffs_epfile *epfile = file->private_data; | |
686 | struct ffs_ep *ep; | |
687 | char *data = NULL; | |
c0d31b3c | 688 | ssize_t ret, data_len = -EINVAL; |
ddf8abd2 MN |
689 | int halt; |
690 | ||
7fa68034 MN |
691 | /* Are we still active? */ |
692 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) { | |
693 | ret = -ENODEV; | |
694 | goto error; | |
695 | } | |
ddf8abd2 | 696 | |
7fa68034 MN |
697 | /* Wait for endpoint to be enabled */ |
698 | ep = epfile->ep; | |
699 | if (!ep) { | |
700 | if (file->f_flags & O_NONBLOCK) { | |
701 | ret = -EAGAIN; | |
ddf8abd2 MN |
702 | goto error; |
703 | } | |
704 | ||
7fa68034 MN |
705 | ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep)); |
706 | if (ret) { | |
707 | ret = -EINTR; | |
ddf8abd2 MN |
708 | goto error; |
709 | } | |
7fa68034 | 710 | } |
ddf8abd2 | 711 | |
7fa68034 | 712 | /* Do we halt? */ |
2e4c7553 | 713 | halt = (!io_data->read == !epfile->in); |
7fa68034 MN |
714 | if (halt && epfile->isoc) { |
715 | ret = -EINVAL; | |
716 | goto error; | |
717 | } | |
ddf8abd2 | 718 | |
7fa68034 MN |
719 | /* Allocate & copy */ |
720 | if (!halt) { | |
f0f42204 AP |
721 | /* |
722 | * if we _do_ wait above, the epfile->ffs->gadget might be NULL | |
723 | * before the waiting completes, so do not assign to 'gadget' earlier | |
724 | */ | |
725 | struct usb_gadget *gadget = epfile->ffs->gadget; | |
c993c39b | 726 | size_t copied; |
f0f42204 | 727 | |
97839ca4 CB |
728 | spin_lock_irq(&epfile->ffs->eps_lock); |
729 | /* In the meantime, endpoint got disabled or changed. */ | |
730 | if (epfile->ep != ep) { | |
731 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
732 | return -ESHUTDOWN; | |
733 | } | |
c993c39b | 734 | data_len = iov_iter_count(&io_data->data); |
219580e6 MN |
735 | /* |
736 | * Controller may require buffer size to be aligned to | |
737 | * maxpacketsize of an out endpoint. | |
738 | */ | |
c993c39b AV |
739 | if (io_data->read) |
740 | data_len = usb_ep_align_maybe(gadget, ep->ep, data_len); | |
97839ca4 | 741 | spin_unlock_irq(&epfile->ffs->eps_lock); |
219580e6 MN |
742 | |
743 | data = kmalloc(data_len, GFP_KERNEL); | |
7fa68034 MN |
744 | if (unlikely(!data)) |
745 | return -ENOMEM; | |
c993c39b AV |
746 | if (!io_data->read) { |
747 | copied = copy_from_iter(data, data_len, &io_data->data); | |
748 | if (copied != data_len) { | |
2e4c7553 RB |
749 | ret = -EFAULT; |
750 | goto error; | |
751 | } | |
7fa68034 MN |
752 | } |
753 | } | |
ddf8abd2 | 754 | |
7fa68034 MN |
755 | /* We will be using request */ |
756 | ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); | |
757 | if (unlikely(ret)) | |
758 | goto error; | |
ddf8abd2 | 759 | |
7fa68034 | 760 | spin_lock_irq(&epfile->ffs->eps_lock); |
ddf8abd2 | 761 | |
7fa68034 MN |
762 | if (epfile->ep != ep) { |
763 | /* In the meantime, endpoint got disabled or changed. */ | |
764 | ret = -ESHUTDOWN; | |
765 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
766 | } else if (halt) { | |
767 | /* Halt */ | |
ddf8abd2 MN |
768 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) |
769 | usb_ep_set_halt(ep->ep); | |
770 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
771 | ret = -EBADMSG; | |
772 | } else { | |
773 | /* Fire the request */ | |
2e4c7553 | 774 | struct usb_request *req; |
ddf8abd2 | 775 | |
c0d31b3c DC |
776 | /* |
777 | * Sanity Check: even though data_len can't be used | |
778 | * uninitialized at the time I write this comment, some | |
779 | * compilers complain about this situation. | |
780 | * In order to keep the code clean from warnings, data_len is | |
781 | * being initialized to -EINVAL during its declaration, which | |
782 | * means we can't rely on compiler anymore to warn no future | |
783 | * changes won't result in data_len being used uninitialized. | |
784 | * For such reason, we're adding this redundant sanity check | |
785 | * here. | |
786 | */ | |
787 | if (unlikely(data_len == -EINVAL)) { | |
788 | WARN(1, "%s: data_len == -EINVAL\n", __func__); | |
789 | ret = -EINVAL; | |
790 | goto error_lock; | |
791 | } | |
792 | ||
2e4c7553 RB |
793 | if (io_data->aio) { |
794 | req = usb_ep_alloc_request(ep->ep, GFP_KERNEL); | |
795 | if (unlikely(!req)) | |
48968f8d | 796 | goto error_lock; |
ddf8abd2 | 797 | |
2e4c7553 | 798 | req->buf = data; |
c0d31b3c | 799 | req->length = data_len; |
ddf8abd2 | 800 | |
2e4c7553 RB |
801 | io_data->buf = data; |
802 | io_data->ep = ep->ep; | |
803 | io_data->req = req; | |
5e33f6fd | 804 | io_data->ffs = epfile->ffs; |
ddf8abd2 | 805 | |
2e4c7553 RB |
806 | req->context = io_data; |
807 | req->complete = ffs_epfile_async_io_complete; | |
808 | ||
809 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); | |
810 | if (unlikely(ret)) { | |
811 | usb_ep_free_request(ep->ep, req); | |
48968f8d | 812 | goto error_lock; |
2e4c7553 RB |
813 | } |
814 | ret = -EIOCBQUEUED; | |
815 | ||
816 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
ddf8abd2 | 817 | } else { |
2e4c7553 RB |
818 | DECLARE_COMPLETION_ONSTACK(done); |
819 | ||
820 | req = ep->req; | |
821 | req->buf = data; | |
c0d31b3c | 822 | req->length = data_len; |
2e4c7553 RB |
823 | |
824 | req->context = &done; | |
825 | req->complete = ffs_epfile_io_complete; | |
826 | ||
827 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); | |
828 | ||
829 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
830 | ||
831 | if (unlikely(ret < 0)) { | |
832 | /* nop */ | |
833 | } else if (unlikely( | |
834 | wait_for_completion_interruptible(&done))) { | |
835 | ret = -EINTR; | |
836 | usb_ep_dequeue(ep->ep, req); | |
837 | } else { | |
cfe919b5 CL |
838 | /* |
839 | * XXX We may end up silently droping data | |
840 | * here. Since data_len (i.e. req->length) may | |
841 | * be bigger than len (after being rounded up | |
842 | * to maxpacketsize), we may end up with more | |
843 | * data then user space has space for. | |
844 | */ | |
845 | ret = ep->status; | |
846 | if (io_data->read && ret > 0) { | |
c993c39b AV |
847 | ret = copy_to_iter(data, ret, &io_data->data); |
848 | if (unlikely(iov_iter_count(&io_data->data))) | |
cfe919b5 CL |
849 | ret = -EFAULT; |
850 | } | |
2e4c7553 RB |
851 | } |
852 | kfree(data); | |
ddf8abd2 MN |
853 | } |
854 | } | |
855 | ||
856 | mutex_unlock(&epfile->mutex); | |
2e4c7553 | 857 | return ret; |
48968f8d RB |
858 | |
859 | error_lock: | |
860 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
861 | mutex_unlock(&epfile->mutex); | |
ddf8abd2 MN |
862 | error: |
863 | kfree(data); | |
864 | return ret; | |
865 | } | |
866 | ||
ddf8abd2 MN |
867 | static int |
868 | ffs_epfile_open(struct inode *inode, struct file *file) | |
869 | { | |
870 | struct ffs_epfile *epfile = inode->i_private; | |
871 | ||
872 | ENTER(); | |
873 | ||
874 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
875 | return -ENODEV; | |
876 | ||
877 | file->private_data = epfile; | |
878 | ffs_data_opened(epfile->ffs); | |
879 | ||
880 | return 0; | |
881 | } | |
882 | ||
2e4c7553 RB |
883 | static int ffs_aio_cancel(struct kiocb *kiocb) |
884 | { | |
885 | struct ffs_io_data *io_data = kiocb->private; | |
886 | struct ffs_epfile *epfile = kiocb->ki_filp->private_data; | |
887 | int value; | |
888 | ||
889 | ENTER(); | |
890 | ||
891 | spin_lock_irq(&epfile->ffs->eps_lock); | |
892 | ||
893 | if (likely(io_data && io_data->ep && io_data->req)) | |
894 | value = usb_ep_dequeue(io_data->ep, io_data->req); | |
895 | else | |
896 | value = -EINVAL; | |
897 | ||
898 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
899 | ||
900 | return value; | |
901 | } | |
902 | ||
70e60d91 | 903 | static ssize_t ffs_epfile_write_iter(struct kiocb *kiocb, struct iov_iter *from) |
2e4c7553 | 904 | { |
70e60d91 | 905 | struct ffs_io_data io_data, *p = &io_data; |
de2080d4 | 906 | ssize_t res; |
2e4c7553 RB |
907 | |
908 | ENTER(); | |
909 | ||
70e60d91 AV |
910 | if (!is_sync_kiocb(kiocb)) { |
911 | p = kmalloc(sizeof(io_data), GFP_KERNEL); | |
912 | if (unlikely(!p)) | |
913 | return -ENOMEM; | |
914 | p->aio = true; | |
915 | } else { | |
916 | p->aio = false; | |
917 | } | |
2e4c7553 | 918 | |
70e60d91 AV |
919 | p->read = false; |
920 | p->kiocb = kiocb; | |
921 | p->data = *from; | |
922 | p->mm = current->mm; | |
2e4c7553 | 923 | |
70e60d91 | 924 | kiocb->private = p; |
2e4c7553 RB |
925 | |
926 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
927 | ||
70e60d91 AV |
928 | res = ffs_epfile_io(kiocb->ki_filp, p); |
929 | if (res == -EIOCBQUEUED) | |
930 | return res; | |
931 | if (p->aio) | |
932 | kfree(p); | |
933 | else | |
934 | *from = p->data; | |
de2080d4 | 935 | return res; |
2e4c7553 RB |
936 | } |
937 | ||
70e60d91 | 938 | static ssize_t ffs_epfile_read_iter(struct kiocb *kiocb, struct iov_iter *to) |
2e4c7553 | 939 | { |
70e60d91 | 940 | struct ffs_io_data io_data, *p = &io_data; |
de2080d4 | 941 | ssize_t res; |
2e4c7553 RB |
942 | |
943 | ENTER(); | |
944 | ||
70e60d91 AV |
945 | if (!is_sync_kiocb(kiocb)) { |
946 | p = kmalloc(sizeof(io_data), GFP_KERNEL); | |
947 | if (unlikely(!p)) | |
948 | return -ENOMEM; | |
949 | p->aio = true; | |
950 | } else { | |
951 | p->aio = false; | |
2e4c7553 RB |
952 | } |
953 | ||
70e60d91 AV |
954 | p->read = true; |
955 | p->kiocb = kiocb; | |
956 | if (p->aio) { | |
957 | p->to_free = dup_iter(&p->data, to, GFP_KERNEL); | |
958 | if (!p->to_free) { | |
959 | kfree(p); | |
960 | return -ENOMEM; | |
961 | } | |
962 | } else { | |
963 | p->data = *to; | |
964 | p->to_free = NULL; | |
965 | } | |
966 | p->mm = current->mm; | |
2e4c7553 | 967 | |
70e60d91 | 968 | kiocb->private = p; |
2e4c7553 RB |
969 | |
970 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
971 | ||
70e60d91 AV |
972 | res = ffs_epfile_io(kiocb->ki_filp, p); |
973 | if (res == -EIOCBQUEUED) | |
974 | return res; | |
975 | ||
976 | if (p->aio) { | |
977 | kfree(p->to_free); | |
978 | kfree(p); | |
979 | } else { | |
980 | *to = p->data; | |
de2080d4 AV |
981 | } |
982 | return res; | |
2e4c7553 RB |
983 | } |
984 | ||
ddf8abd2 MN |
985 | static int |
986 | ffs_epfile_release(struct inode *inode, struct file *file) | |
987 | { | |
988 | struct ffs_epfile *epfile = inode->i_private; | |
989 | ||
990 | ENTER(); | |
991 | ||
992 | ffs_data_closed(epfile->ffs); | |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
ddf8abd2 MN |
997 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
998 | unsigned long value) | |
999 | { | |
1000 | struct ffs_epfile *epfile = file->private_data; | |
1001 | int ret; | |
1002 | ||
1003 | ENTER(); | |
1004 | ||
1005 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
1006 | return -ENODEV; | |
1007 | ||
1008 | spin_lock_irq(&epfile->ffs->eps_lock); | |
1009 | if (likely(epfile->ep)) { | |
1010 | switch (code) { | |
1011 | case FUNCTIONFS_FIFO_STATUS: | |
1012 | ret = usb_ep_fifo_status(epfile->ep->ep); | |
1013 | break; | |
1014 | case FUNCTIONFS_FIFO_FLUSH: | |
1015 | usb_ep_fifo_flush(epfile->ep->ep); | |
1016 | ret = 0; | |
1017 | break; | |
1018 | case FUNCTIONFS_CLEAR_HALT: | |
1019 | ret = usb_ep_clear_halt(epfile->ep->ep); | |
1020 | break; | |
1021 | case FUNCTIONFS_ENDPOINT_REVMAP: | |
1022 | ret = epfile->ep->num; | |
1023 | break; | |
c559a353 RB |
1024 | case FUNCTIONFS_ENDPOINT_DESC: |
1025 | { | |
1026 | int desc_idx; | |
1027 | struct usb_endpoint_descriptor *desc; | |
1028 | ||
1029 | switch (epfile->ffs->gadget->speed) { | |
1030 | case USB_SPEED_SUPER: | |
1031 | desc_idx = 2; | |
1032 | break; | |
1033 | case USB_SPEED_HIGH: | |
1034 | desc_idx = 1; | |
1035 | break; | |
1036 | default: | |
1037 | desc_idx = 0; | |
1038 | } | |
1039 | desc = epfile->ep->descs[desc_idx]; | |
1040 | ||
1041 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1042 | ret = copy_to_user((void *)value, desc, sizeof(*desc)); | |
1043 | if (ret) | |
1044 | ret = -EFAULT; | |
1045 | return ret; | |
1046 | } | |
ddf8abd2 MN |
1047 | default: |
1048 | ret = -ENOTTY; | |
1049 | } | |
1050 | } else { | |
1051 | ret = -ENODEV; | |
1052 | } | |
1053 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1054 | ||
1055 | return ret; | |
1056 | } | |
1057 | ||
ddf8abd2 | 1058 | static const struct file_operations ffs_epfile_operations = { |
ddf8abd2 MN |
1059 | .llseek = no_llseek, |
1060 | ||
1061 | .open = ffs_epfile_open, | |
70e60d91 AV |
1062 | .write = new_sync_write, |
1063 | .read = new_sync_read, | |
1064 | .write_iter = ffs_epfile_write_iter, | |
1065 | .read_iter = ffs_epfile_read_iter, | |
ddf8abd2 MN |
1066 | .release = ffs_epfile_release, |
1067 | .unlocked_ioctl = ffs_epfile_ioctl, | |
1068 | }; | |
1069 | ||
1070 | ||
ddf8abd2 MN |
1071 | /* File system and super block operations ***********************************/ |
1072 | ||
1073 | /* | |
5ab54cf7 | 1074 | * Mounting the file system creates a controller file, used first for |
ddf8abd2 MN |
1075 | * function configuration then later for event monitoring. |
1076 | */ | |
1077 | ||
ddf8abd2 MN |
1078 | static struct inode *__must_check |
1079 | ffs_sb_make_inode(struct super_block *sb, void *data, | |
1080 | const struct file_operations *fops, | |
1081 | const struct inode_operations *iops, | |
1082 | struct ffs_file_perms *perms) | |
1083 | { | |
1084 | struct inode *inode; | |
1085 | ||
1086 | ENTER(); | |
1087 | ||
1088 | inode = new_inode(sb); | |
1089 | ||
1090 | if (likely(inode)) { | |
1091 | struct timespec current_time = CURRENT_TIME; | |
1092 | ||
12ba8d1e | 1093 | inode->i_ino = get_next_ino(); |
ddf8abd2 MN |
1094 | inode->i_mode = perms->mode; |
1095 | inode->i_uid = perms->uid; | |
1096 | inode->i_gid = perms->gid; | |
1097 | inode->i_atime = current_time; | |
1098 | inode->i_mtime = current_time; | |
1099 | inode->i_ctime = current_time; | |
1100 | inode->i_private = data; | |
1101 | if (fops) | |
1102 | inode->i_fop = fops; | |
1103 | if (iops) | |
1104 | inode->i_op = iops; | |
1105 | } | |
1106 | ||
1107 | return inode; | |
1108 | } | |
1109 | ||
ddf8abd2 | 1110 | /* Create "regular" file */ |
1bb27cac | 1111 | static struct dentry *ffs_sb_create_file(struct super_block *sb, |
ddf8abd2 | 1112 | const char *name, void *data, |
1bb27cac | 1113 | const struct file_operations *fops) |
ddf8abd2 MN |
1114 | { |
1115 | struct ffs_data *ffs = sb->s_fs_info; | |
1116 | struct dentry *dentry; | |
1117 | struct inode *inode; | |
1118 | ||
1119 | ENTER(); | |
1120 | ||
1121 | dentry = d_alloc_name(sb->s_root, name); | |
1122 | if (unlikely(!dentry)) | |
1123 | return NULL; | |
1124 | ||
1125 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); | |
1126 | if (unlikely(!inode)) { | |
1127 | dput(dentry); | |
1128 | return NULL; | |
1129 | } | |
1130 | ||
1131 | d_add(dentry, inode); | |
1bb27cac | 1132 | return dentry; |
ddf8abd2 MN |
1133 | } |
1134 | ||
ddf8abd2 | 1135 | /* Super block */ |
ddf8abd2 MN |
1136 | static const struct super_operations ffs_sb_operations = { |
1137 | .statfs = simple_statfs, | |
1138 | .drop_inode = generic_delete_inode, | |
1139 | }; | |
1140 | ||
1141 | struct ffs_sb_fill_data { | |
1142 | struct ffs_file_perms perms; | |
1143 | umode_t root_mode; | |
1144 | const char *dev_name; | |
18d6b32f | 1145 | bool no_disconnect; |
2606b28a | 1146 | struct ffs_data *ffs_data; |
ddf8abd2 MN |
1147 | }; |
1148 | ||
1149 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) | |
1150 | { | |
1151 | struct ffs_sb_fill_data *data = _data; | |
1152 | struct inode *inode; | |
2606b28a | 1153 | struct ffs_data *ffs = data->ffs_data; |
ddf8abd2 MN |
1154 | |
1155 | ENTER(); | |
1156 | ||
ddf8abd2 | 1157 | ffs->sb = sb; |
2606b28a | 1158 | data->ffs_data = NULL; |
ddf8abd2 MN |
1159 | sb->s_fs_info = ffs; |
1160 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1161 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
1162 | sb->s_magic = FUNCTIONFS_MAGIC; | |
1163 | sb->s_op = &ffs_sb_operations; | |
1164 | sb->s_time_gran = 1; | |
1165 | ||
1166 | /* Root inode */ | |
1167 | data->perms.mode = data->root_mode; | |
1168 | inode = ffs_sb_make_inode(sb, NULL, | |
1169 | &simple_dir_operations, | |
1170 | &simple_dir_inode_operations, | |
1171 | &data->perms); | |
48fde701 AV |
1172 | sb->s_root = d_make_root(inode); |
1173 | if (unlikely(!sb->s_root)) | |
2606b28a | 1174 | return -ENOMEM; |
ddf8abd2 MN |
1175 | |
1176 | /* EP0 file */ | |
1177 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, | |
1bb27cac | 1178 | &ffs_ep0_operations))) |
2606b28a | 1179 | return -ENOMEM; |
ddf8abd2 MN |
1180 | |
1181 | return 0; | |
ddf8abd2 MN |
1182 | } |
1183 | ||
ddf8abd2 MN |
1184 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
1185 | { | |
1186 | ENTER(); | |
1187 | ||
1188 | if (!opts || !*opts) | |
1189 | return 0; | |
1190 | ||
1191 | for (;;) { | |
ddf8abd2 | 1192 | unsigned long value; |
afd2e186 | 1193 | char *eq, *comma; |
ddf8abd2 MN |
1194 | |
1195 | /* Option limit */ | |
1196 | comma = strchr(opts, ','); | |
1197 | if (comma) | |
1198 | *comma = 0; | |
1199 | ||
1200 | /* Value limit */ | |
1201 | eq = strchr(opts, '='); | |
1202 | if (unlikely(!eq)) { | |
aa02f172 | 1203 | pr_err("'=' missing in %s\n", opts); |
ddf8abd2 MN |
1204 | return -EINVAL; |
1205 | } | |
1206 | *eq = 0; | |
1207 | ||
1208 | /* Parse value */ | |
afd2e186 | 1209 | if (kstrtoul(eq + 1, 0, &value)) { |
aa02f172 | 1210 | pr_err("%s: invalid value: %s\n", opts, eq + 1); |
ddf8abd2 MN |
1211 | return -EINVAL; |
1212 | } | |
1213 | ||
1214 | /* Interpret option */ | |
1215 | switch (eq - opts) { | |
18d6b32f RB |
1216 | case 13: |
1217 | if (!memcmp(opts, "no_disconnect", 13)) | |
1218 | data->no_disconnect = !!value; | |
1219 | else | |
1220 | goto invalid; | |
1221 | break; | |
ddf8abd2 MN |
1222 | case 5: |
1223 | if (!memcmp(opts, "rmode", 5)) | |
1224 | data->root_mode = (value & 0555) | S_IFDIR; | |
1225 | else if (!memcmp(opts, "fmode", 5)) | |
1226 | data->perms.mode = (value & 0666) | S_IFREG; | |
1227 | else | |
1228 | goto invalid; | |
1229 | break; | |
1230 | ||
1231 | case 4: | |
1232 | if (!memcmp(opts, "mode", 4)) { | |
1233 | data->root_mode = (value & 0555) | S_IFDIR; | |
1234 | data->perms.mode = (value & 0666) | S_IFREG; | |
1235 | } else { | |
1236 | goto invalid; | |
1237 | } | |
1238 | break; | |
1239 | ||
1240 | case 3: | |
b9b73f7c EB |
1241 | if (!memcmp(opts, "uid", 3)) { |
1242 | data->perms.uid = make_kuid(current_user_ns(), value); | |
1243 | if (!uid_valid(data->perms.uid)) { | |
1244 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1245 | return -EINVAL; | |
1246 | } | |
b8100750 | 1247 | } else if (!memcmp(opts, "gid", 3)) { |
b9b73f7c EB |
1248 | data->perms.gid = make_kgid(current_user_ns(), value); |
1249 | if (!gid_valid(data->perms.gid)) { | |
1250 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1251 | return -EINVAL; | |
1252 | } | |
b8100750 | 1253 | } else { |
ddf8abd2 | 1254 | goto invalid; |
b8100750 | 1255 | } |
ddf8abd2 MN |
1256 | break; |
1257 | ||
1258 | default: | |
1259 | invalid: | |
aa02f172 | 1260 | pr_err("%s: invalid option\n", opts); |
ddf8abd2 MN |
1261 | return -EINVAL; |
1262 | } | |
1263 | ||
1264 | /* Next iteration */ | |
1265 | if (!comma) | |
1266 | break; | |
1267 | opts = comma + 1; | |
1268 | } | |
1269 | ||
1270 | return 0; | |
1271 | } | |
1272 | ||
ddf8abd2 MN |
1273 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
1274 | ||
fc14f2fe AV |
1275 | static struct dentry * |
1276 | ffs_fs_mount(struct file_system_type *t, int flags, | |
1277 | const char *dev_name, void *opts) | |
ddf8abd2 MN |
1278 | { |
1279 | struct ffs_sb_fill_data data = { | |
1280 | .perms = { | |
1281 | .mode = S_IFREG | 0600, | |
b9b73f7c EB |
1282 | .uid = GLOBAL_ROOT_UID, |
1283 | .gid = GLOBAL_ROOT_GID, | |
ddf8abd2 MN |
1284 | }, |
1285 | .root_mode = S_IFDIR | 0500, | |
18d6b32f | 1286 | .no_disconnect = false, |
ddf8abd2 | 1287 | }; |
581791f5 | 1288 | struct dentry *rv; |
ddf8abd2 | 1289 | int ret; |
581791f5 | 1290 | void *ffs_dev; |
2606b28a | 1291 | struct ffs_data *ffs; |
ddf8abd2 MN |
1292 | |
1293 | ENTER(); | |
1294 | ||
ddf8abd2 MN |
1295 | ret = ffs_fs_parse_opts(&data, opts); |
1296 | if (unlikely(ret < 0)) | |
fc14f2fe | 1297 | return ERR_PTR(ret); |
ddf8abd2 | 1298 | |
2606b28a AV |
1299 | ffs = ffs_data_new(); |
1300 | if (unlikely(!ffs)) | |
1301 | return ERR_PTR(-ENOMEM); | |
1302 | ffs->file_perms = data.perms; | |
18d6b32f | 1303 | ffs->no_disconnect = data.no_disconnect; |
2606b28a AV |
1304 | |
1305 | ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); | |
1306 | if (unlikely(!ffs->dev_name)) { | |
1307 | ffs_data_put(ffs); | |
1308 | return ERR_PTR(-ENOMEM); | |
1309 | } | |
1310 | ||
4b187fce | 1311 | ffs_dev = ffs_acquire_dev(dev_name); |
2606b28a AV |
1312 | if (IS_ERR(ffs_dev)) { |
1313 | ffs_data_put(ffs); | |
1314 | return ERR_CAST(ffs_dev); | |
1315 | } | |
1316 | ffs->private_data = ffs_dev; | |
1317 | data.ffs_data = ffs; | |
581791f5 | 1318 | |
581791f5 | 1319 | rv = mount_nodev(t, flags, &data, ffs_sb_fill); |
2606b28a | 1320 | if (IS_ERR(rv) && data.ffs_data) { |
4b187fce | 1321 | ffs_release_dev(data.ffs_data); |
2606b28a AV |
1322 | ffs_data_put(data.ffs_data); |
1323 | } | |
581791f5 | 1324 | return rv; |
ddf8abd2 MN |
1325 | } |
1326 | ||
1327 | static void | |
1328 | ffs_fs_kill_sb(struct super_block *sb) | |
1329 | { | |
ddf8abd2 MN |
1330 | ENTER(); |
1331 | ||
1332 | kill_litter_super(sb); | |
581791f5 | 1333 | if (sb->s_fs_info) { |
4b187fce | 1334 | ffs_release_dev(sb->s_fs_info); |
18d6b32f | 1335 | ffs_data_closed(sb->s_fs_info); |
5b5f9560 | 1336 | ffs_data_put(sb->s_fs_info); |
581791f5 | 1337 | } |
ddf8abd2 MN |
1338 | } |
1339 | ||
1340 | static struct file_system_type ffs_fs_type = { | |
1341 | .owner = THIS_MODULE, | |
1342 | .name = "functionfs", | |
fc14f2fe | 1343 | .mount = ffs_fs_mount, |
ddf8abd2 MN |
1344 | .kill_sb = ffs_fs_kill_sb, |
1345 | }; | |
7f78e035 | 1346 | MODULE_ALIAS_FS("functionfs"); |
ddf8abd2 MN |
1347 | |
1348 | ||
ddf8abd2 MN |
1349 | /* Driver's main init/cleanup functions *************************************/ |
1350 | ||
ddf8abd2 MN |
1351 | static int functionfs_init(void) |
1352 | { | |
1353 | int ret; | |
1354 | ||
1355 | ENTER(); | |
1356 | ||
1357 | ret = register_filesystem(&ffs_fs_type); | |
1358 | if (likely(!ret)) | |
aa02f172 | 1359 | pr_info("file system registered\n"); |
ddf8abd2 | 1360 | else |
aa02f172 | 1361 | pr_err("failed registering file system (%d)\n", ret); |
ddf8abd2 MN |
1362 | |
1363 | return ret; | |
1364 | } | |
1365 | ||
1366 | static void functionfs_cleanup(void) | |
1367 | { | |
1368 | ENTER(); | |
1369 | ||
aa02f172 | 1370 | pr_info("unloading\n"); |
ddf8abd2 MN |
1371 | unregister_filesystem(&ffs_fs_type); |
1372 | } | |
1373 | ||
1374 | ||
ddf8abd2 MN |
1375 | /* ffs_data and ffs_function construction and destruction code **************/ |
1376 | ||
1377 | static void ffs_data_clear(struct ffs_data *ffs); | |
1378 | static void ffs_data_reset(struct ffs_data *ffs); | |
1379 | ||
ddf8abd2 MN |
1380 | static void ffs_data_get(struct ffs_data *ffs) |
1381 | { | |
1382 | ENTER(); | |
1383 | ||
1384 | atomic_inc(&ffs->ref); | |
1385 | } | |
1386 | ||
1387 | static void ffs_data_opened(struct ffs_data *ffs) | |
1388 | { | |
1389 | ENTER(); | |
1390 | ||
1391 | atomic_inc(&ffs->ref); | |
18d6b32f RB |
1392 | if (atomic_add_return(1, &ffs->opened) == 1 && |
1393 | ffs->state == FFS_DEACTIVATED) { | |
1394 | ffs->state = FFS_CLOSING; | |
1395 | ffs_data_reset(ffs); | |
1396 | } | |
ddf8abd2 MN |
1397 | } |
1398 | ||
1399 | static void ffs_data_put(struct ffs_data *ffs) | |
1400 | { | |
1401 | ENTER(); | |
1402 | ||
1403 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { | |
aa02f172 | 1404 | pr_info("%s(): freeing\n", __func__); |
ddf8abd2 | 1405 | ffs_data_clear(ffs); |
647d5580 | 1406 | BUG_ON(waitqueue_active(&ffs->ev.waitq) || |
ddf8abd2 | 1407 | waitqueue_active(&ffs->ep0req_completion.wait)); |
581791f5 | 1408 | kfree(ffs->dev_name); |
ddf8abd2 MN |
1409 | kfree(ffs); |
1410 | } | |
1411 | } | |
1412 | ||
ddf8abd2 MN |
1413 | static void ffs_data_closed(struct ffs_data *ffs) |
1414 | { | |
1415 | ENTER(); | |
1416 | ||
1417 | if (atomic_dec_and_test(&ffs->opened)) { | |
18d6b32f RB |
1418 | if (ffs->no_disconnect) { |
1419 | ffs->state = FFS_DEACTIVATED; | |
1420 | if (ffs->epfiles) { | |
1421 | ffs_epfiles_destroy(ffs->epfiles, | |
1422 | ffs->eps_count); | |
1423 | ffs->epfiles = NULL; | |
1424 | } | |
1425 | if (ffs->setup_state == FFS_SETUP_PENDING) | |
1426 | __ffs_ep0_stall(ffs); | |
1427 | } else { | |
1428 | ffs->state = FFS_CLOSING; | |
1429 | ffs_data_reset(ffs); | |
1430 | } | |
1431 | } | |
1432 | if (atomic_read(&ffs->opened) < 0) { | |
ddf8abd2 MN |
1433 | ffs->state = FFS_CLOSING; |
1434 | ffs_data_reset(ffs); | |
1435 | } | |
1436 | ||
1437 | ffs_data_put(ffs); | |
1438 | } | |
1439 | ||
ddf8abd2 MN |
1440 | static struct ffs_data *ffs_data_new(void) |
1441 | { | |
1442 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); | |
1443 | if (unlikely(!ffs)) | |
f8800d47 | 1444 | return NULL; |
ddf8abd2 MN |
1445 | |
1446 | ENTER(); | |
1447 | ||
1448 | atomic_set(&ffs->ref, 1); | |
1449 | atomic_set(&ffs->opened, 0); | |
1450 | ffs->state = FFS_READ_DESCRIPTORS; | |
1451 | mutex_init(&ffs->mutex); | |
1452 | spin_lock_init(&ffs->eps_lock); | |
1453 | init_waitqueue_head(&ffs->ev.waitq); | |
1454 | init_completion(&ffs->ep0req_completion); | |
1455 | ||
1456 | /* XXX REVISIT need to update it in some places, or do we? */ | |
1457 | ffs->ev.can_stall = 1; | |
1458 | ||
1459 | return ffs; | |
1460 | } | |
1461 | ||
ddf8abd2 MN |
1462 | static void ffs_data_clear(struct ffs_data *ffs) |
1463 | { | |
1464 | ENTER(); | |
1465 | ||
1466 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags)) | |
4b187fce | 1467 | ffs_closed(ffs); |
ddf8abd2 MN |
1468 | |
1469 | BUG_ON(ffs->gadget); | |
1470 | ||
1471 | if (ffs->epfiles) | |
1472 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); | |
1473 | ||
5e33f6fd RB |
1474 | if (ffs->ffs_eventfd) |
1475 | eventfd_ctx_put(ffs->ffs_eventfd); | |
1476 | ||
ac8dde11 | 1477 | kfree(ffs->raw_descs_data); |
ddf8abd2 MN |
1478 | kfree(ffs->raw_strings); |
1479 | kfree(ffs->stringtabs); | |
1480 | } | |
1481 | ||
ddf8abd2 MN |
1482 | static void ffs_data_reset(struct ffs_data *ffs) |
1483 | { | |
1484 | ENTER(); | |
1485 | ||
1486 | ffs_data_clear(ffs); | |
1487 | ||
1488 | ffs->epfiles = NULL; | |
ac8dde11 | 1489 | ffs->raw_descs_data = NULL; |
ddf8abd2 MN |
1490 | ffs->raw_descs = NULL; |
1491 | ffs->raw_strings = NULL; | |
1492 | ffs->stringtabs = NULL; | |
1493 | ||
1494 | ffs->raw_descs_length = 0; | |
ddf8abd2 MN |
1495 | ffs->fs_descs_count = 0; |
1496 | ffs->hs_descs_count = 0; | |
8d4e897b | 1497 | ffs->ss_descs_count = 0; |
ddf8abd2 MN |
1498 | |
1499 | ffs->strings_count = 0; | |
1500 | ffs->interfaces_count = 0; | |
1501 | ffs->eps_count = 0; | |
1502 | ||
1503 | ffs->ev.count = 0; | |
1504 | ||
1505 | ffs->state = FFS_READ_DESCRIPTORS; | |
1506 | ffs->setup_state = FFS_NO_SETUP; | |
1507 | ffs->flags = 0; | |
1508 | } | |
1509 | ||
1510 | ||
1511 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) | |
1512 | { | |
fd7c9a00 MN |
1513 | struct usb_gadget_strings **lang; |
1514 | int first_id; | |
ddf8abd2 MN |
1515 | |
1516 | ENTER(); | |
1517 | ||
1518 | if (WARN_ON(ffs->state != FFS_ACTIVE | |
1519 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) | |
1520 | return -EBADFD; | |
1521 | ||
fd7c9a00 MN |
1522 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
1523 | if (unlikely(first_id < 0)) | |
1524 | return first_id; | |
ddf8abd2 MN |
1525 | |
1526 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); | |
1527 | if (unlikely(!ffs->ep0req)) | |
1528 | return -ENOMEM; | |
1529 | ffs->ep0req->complete = ffs_ep0_complete; | |
1530 | ffs->ep0req->context = ffs; | |
1531 | ||
fd7c9a00 | 1532 | lang = ffs->stringtabs; |
f0688c8b MN |
1533 | if (lang) { |
1534 | for (; *lang; ++lang) { | |
1535 | struct usb_string *str = (*lang)->strings; | |
1536 | int id = first_id; | |
1537 | for (; str->s; ++id, ++str) | |
1538 | str->id = id; | |
1539 | } | |
ddf8abd2 MN |
1540 | } |
1541 | ||
1542 | ffs->gadget = cdev->gadget; | |
fd7c9a00 | 1543 | ffs_data_get(ffs); |
ddf8abd2 MN |
1544 | return 0; |
1545 | } | |
1546 | ||
ddf8abd2 MN |
1547 | static void functionfs_unbind(struct ffs_data *ffs) |
1548 | { | |
1549 | ENTER(); | |
1550 | ||
1551 | if (!WARN_ON(!ffs->gadget)) { | |
1552 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); | |
1553 | ffs->ep0req = NULL; | |
1554 | ffs->gadget = NULL; | |
e2190a97 | 1555 | clear_bit(FFS_FL_BOUND, &ffs->flags); |
df498995 | 1556 | ffs_data_put(ffs); |
ddf8abd2 MN |
1557 | } |
1558 | } | |
1559 | ||
ddf8abd2 MN |
1560 | static int ffs_epfiles_create(struct ffs_data *ffs) |
1561 | { | |
1562 | struct ffs_epfile *epfile, *epfiles; | |
1563 | unsigned i, count; | |
1564 | ||
1565 | ENTER(); | |
1566 | ||
1567 | count = ffs->eps_count; | |
9823a525 | 1568 | epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL); |
ddf8abd2 MN |
1569 | if (!epfiles) |
1570 | return -ENOMEM; | |
1571 | ||
1572 | epfile = epfiles; | |
1573 | for (i = 1; i <= count; ++i, ++epfile) { | |
1574 | epfile->ffs = ffs; | |
1575 | mutex_init(&epfile->mutex); | |
1576 | init_waitqueue_head(&epfile->wait); | |
1b0bf88f | 1577 | if (ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) |
acba23fe | 1578 | sprintf(epfile->name, "ep%02x", ffs->eps_addrmap[i]); |
1b0bf88f | 1579 | else |
acba23fe MS |
1580 | sprintf(epfile->name, "ep%u", i); |
1581 | epfile->dentry = ffs_sb_create_file(ffs->sb, epfile->name, | |
1bb27cac AV |
1582 | epfile, |
1583 | &ffs_epfile_operations); | |
1584 | if (unlikely(!epfile->dentry)) { | |
ddf8abd2 MN |
1585 | ffs_epfiles_destroy(epfiles, i - 1); |
1586 | return -ENOMEM; | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | ffs->epfiles = epfiles; | |
1591 | return 0; | |
1592 | } | |
1593 | ||
ddf8abd2 MN |
1594 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
1595 | { | |
1596 | struct ffs_epfile *epfile = epfiles; | |
1597 | ||
1598 | ENTER(); | |
1599 | ||
1600 | for (; count; --count, ++epfile) { | |
1601 | BUG_ON(mutex_is_locked(&epfile->mutex) || | |
1602 | waitqueue_active(&epfile->wait)); | |
1603 | if (epfile->dentry) { | |
1604 | d_delete(epfile->dentry); | |
1605 | dput(epfile->dentry); | |
1606 | epfile->dentry = NULL; | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | kfree(epfiles); | |
1611 | } | |
1612 | ||
ddf8abd2 MN |
1613 | static void ffs_func_eps_disable(struct ffs_function *func) |
1614 | { | |
1615 | struct ffs_ep *ep = func->eps; | |
1616 | struct ffs_epfile *epfile = func->ffs->epfiles; | |
1617 | unsigned count = func->ffs->eps_count; | |
1618 | unsigned long flags; | |
1619 | ||
1620 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1621 | do { | |
1622 | /* pending requests get nuked */ | |
1623 | if (likely(ep->ep)) | |
1624 | usb_ep_disable(ep->ep); | |
ddf8abd2 | 1625 | ++ep; |
18d6b32f RB |
1626 | |
1627 | if (epfile) { | |
1628 | epfile->ep = NULL; | |
1629 | ++epfile; | |
1630 | } | |
ddf8abd2 MN |
1631 | } while (--count); |
1632 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1633 | } | |
1634 | ||
1635 | static int ffs_func_eps_enable(struct ffs_function *func) | |
1636 | { | |
1637 | struct ffs_data *ffs = func->ffs; | |
1638 | struct ffs_ep *ep = func->eps; | |
1639 | struct ffs_epfile *epfile = ffs->epfiles; | |
1640 | unsigned count = ffs->eps_count; | |
1641 | unsigned long flags; | |
1642 | int ret = 0; | |
1643 | ||
1644 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1645 | do { | |
1646 | struct usb_endpoint_descriptor *ds; | |
8d4e897b MG |
1647 | int desc_idx; |
1648 | ||
1649 | if (ffs->gadget->speed == USB_SPEED_SUPER) | |
1650 | desc_idx = 2; | |
1651 | else if (ffs->gadget->speed == USB_SPEED_HIGH) | |
1652 | desc_idx = 1; | |
1653 | else | |
1654 | desc_idx = 0; | |
1655 | ||
1656 | /* fall-back to lower speed if desc missing for current speed */ | |
1657 | do { | |
1658 | ds = ep->descs[desc_idx]; | |
1659 | } while (!ds && --desc_idx >= 0); | |
1660 | ||
1661 | if (!ds) { | |
1662 | ret = -EINVAL; | |
1663 | break; | |
1664 | } | |
ddf8abd2 MN |
1665 | |
1666 | ep->ep->driver_data = ep; | |
72c973dd TB |
1667 | ep->ep->desc = ds; |
1668 | ret = usb_ep_enable(ep->ep); | |
ddf8abd2 MN |
1669 | if (likely(!ret)) { |
1670 | epfile->ep = ep; | |
1671 | epfile->in = usb_endpoint_dir_in(ds); | |
1672 | epfile->isoc = usb_endpoint_xfer_isoc(ds); | |
1673 | } else { | |
1674 | break; | |
1675 | } | |
1676 | ||
1677 | wake_up(&epfile->wait); | |
1678 | ||
1679 | ++ep; | |
1680 | ++epfile; | |
1681 | } while (--count); | |
1682 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1683 | ||
1684 | return ret; | |
1685 | } | |
1686 | ||
1687 | ||
1688 | /* Parsing and building descriptors and strings *****************************/ | |
1689 | ||
5ab54cf7 MN |
1690 | /* |
1691 | * This validates if data pointed by data is a valid USB descriptor as | |
ddf8abd2 | 1692 | * well as record how many interfaces, endpoints and strings are |
5ab54cf7 MN |
1693 | * required by given configuration. Returns address after the |
1694 | * descriptor or NULL if data is invalid. | |
1695 | */ | |
ddf8abd2 MN |
1696 | |
1697 | enum ffs_entity_type { | |
1698 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT | |
1699 | }; | |
1700 | ||
f0175ab5 AP |
1701 | enum ffs_os_desc_type { |
1702 | FFS_OS_DESC, FFS_OS_DESC_EXT_COMPAT, FFS_OS_DESC_EXT_PROP | |
1703 | }; | |
1704 | ||
ddf8abd2 MN |
1705 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, |
1706 | u8 *valuep, | |
1707 | struct usb_descriptor_header *desc, | |
1708 | void *priv); | |
1709 | ||
f0175ab5 AP |
1710 | typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, |
1711 | struct usb_os_desc_header *h, void *data, | |
1712 | unsigned len, void *priv); | |
1713 | ||
f96cbd14 AP |
1714 | static int __must_check ffs_do_single_desc(char *data, unsigned len, |
1715 | ffs_entity_callback entity, | |
1716 | void *priv) | |
ddf8abd2 MN |
1717 | { |
1718 | struct usb_descriptor_header *_ds = (void *)data; | |
1719 | u8 length; | |
1720 | int ret; | |
1721 | ||
1722 | ENTER(); | |
1723 | ||
1724 | /* At least two bytes are required: length and type */ | |
1725 | if (len < 2) { | |
aa02f172 | 1726 | pr_vdebug("descriptor too short\n"); |
ddf8abd2 MN |
1727 | return -EINVAL; |
1728 | } | |
1729 | ||
1730 | /* If we have at least as many bytes as the descriptor takes? */ | |
1731 | length = _ds->bLength; | |
1732 | if (len < length) { | |
aa02f172 | 1733 | pr_vdebug("descriptor longer then available data\n"); |
ddf8abd2 MN |
1734 | return -EINVAL; |
1735 | } | |
1736 | ||
1737 | #define __entity_check_INTERFACE(val) 1 | |
1738 | #define __entity_check_STRING(val) (val) | |
1739 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) | |
1740 | #define __entity(type, val) do { \ | |
aa02f172 | 1741 | pr_vdebug("entity " #type "(%02x)\n", (val)); \ |
ddf8abd2 | 1742 | if (unlikely(!__entity_check_ ##type(val))) { \ |
aa02f172 | 1743 | pr_vdebug("invalid entity's value\n"); \ |
ddf8abd2 MN |
1744 | return -EINVAL; \ |
1745 | } \ | |
1746 | ret = entity(FFS_ ##type, &val, _ds, priv); \ | |
1747 | if (unlikely(ret < 0)) { \ | |
aa02f172 | 1748 | pr_debug("entity " #type "(%02x); ret = %d\n", \ |
d8df0b61 | 1749 | (val), ret); \ |
ddf8abd2 MN |
1750 | return ret; \ |
1751 | } \ | |
1752 | } while (0) | |
1753 | ||
1754 | /* Parse descriptor depending on type. */ | |
1755 | switch (_ds->bDescriptorType) { | |
1756 | case USB_DT_DEVICE: | |
1757 | case USB_DT_CONFIG: | |
1758 | case USB_DT_STRING: | |
1759 | case USB_DT_DEVICE_QUALIFIER: | |
1760 | /* function can't have any of those */ | |
aa02f172 | 1761 | pr_vdebug("descriptor reserved for gadget: %d\n", |
5ab54cf7 | 1762 | _ds->bDescriptorType); |
ddf8abd2 MN |
1763 | return -EINVAL; |
1764 | ||
1765 | case USB_DT_INTERFACE: { | |
1766 | struct usb_interface_descriptor *ds = (void *)_ds; | |
aa02f172 | 1767 | pr_vdebug("interface descriptor\n"); |
ddf8abd2 MN |
1768 | if (length != sizeof *ds) |
1769 | goto inv_length; | |
1770 | ||
1771 | __entity(INTERFACE, ds->bInterfaceNumber); | |
1772 | if (ds->iInterface) | |
1773 | __entity(STRING, ds->iInterface); | |
1774 | } | |
1775 | break; | |
1776 | ||
1777 | case USB_DT_ENDPOINT: { | |
1778 | struct usb_endpoint_descriptor *ds = (void *)_ds; | |
aa02f172 | 1779 | pr_vdebug("endpoint descriptor\n"); |
ddf8abd2 MN |
1780 | if (length != USB_DT_ENDPOINT_SIZE && |
1781 | length != USB_DT_ENDPOINT_AUDIO_SIZE) | |
1782 | goto inv_length; | |
1783 | __entity(ENDPOINT, ds->bEndpointAddress); | |
1784 | } | |
1785 | break; | |
1786 | ||
560f1187 KB |
1787 | case HID_DT_HID: |
1788 | pr_vdebug("hid descriptor\n"); | |
1789 | if (length != sizeof(struct hid_descriptor)) | |
1790 | goto inv_length; | |
1791 | break; | |
1792 | ||
ddf8abd2 MN |
1793 | case USB_DT_OTG: |
1794 | if (length != sizeof(struct usb_otg_descriptor)) | |
1795 | goto inv_length; | |
1796 | break; | |
1797 | ||
1798 | case USB_DT_INTERFACE_ASSOCIATION: { | |
1799 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; | |
aa02f172 | 1800 | pr_vdebug("interface association descriptor\n"); |
ddf8abd2 MN |
1801 | if (length != sizeof *ds) |
1802 | goto inv_length; | |
1803 | if (ds->iFunction) | |
1804 | __entity(STRING, ds->iFunction); | |
1805 | } | |
1806 | break; | |
1807 | ||
8d4e897b MG |
1808 | case USB_DT_SS_ENDPOINT_COMP: |
1809 | pr_vdebug("EP SS companion descriptor\n"); | |
1810 | if (length != sizeof(struct usb_ss_ep_comp_descriptor)) | |
1811 | goto inv_length; | |
1812 | break; | |
1813 | ||
ddf8abd2 MN |
1814 | case USB_DT_OTHER_SPEED_CONFIG: |
1815 | case USB_DT_INTERFACE_POWER: | |
1816 | case USB_DT_DEBUG: | |
1817 | case USB_DT_SECURITY: | |
1818 | case USB_DT_CS_RADIO_CONTROL: | |
1819 | /* TODO */ | |
aa02f172 | 1820 | pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1821 | return -EINVAL; |
1822 | ||
1823 | default: | |
1824 | /* We should never be here */ | |
aa02f172 | 1825 | pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1826 | return -EINVAL; |
1827 | ||
5ab54cf7 | 1828 | inv_length: |
aa02f172 | 1829 | pr_vdebug("invalid length: %d (descriptor %d)\n", |
d8df0b61 | 1830 | _ds->bLength, _ds->bDescriptorType); |
ddf8abd2 MN |
1831 | return -EINVAL; |
1832 | } | |
1833 | ||
1834 | #undef __entity | |
1835 | #undef __entity_check_DESCRIPTOR | |
1836 | #undef __entity_check_INTERFACE | |
1837 | #undef __entity_check_STRING | |
1838 | #undef __entity_check_ENDPOINT | |
1839 | ||
1840 | return length; | |
1841 | } | |
1842 | ||
ddf8abd2 MN |
1843 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
1844 | ffs_entity_callback entity, void *priv) | |
1845 | { | |
1846 | const unsigned _len = len; | |
1847 | unsigned long num = 0; | |
1848 | ||
1849 | ENTER(); | |
1850 | ||
1851 | for (;;) { | |
1852 | int ret; | |
1853 | ||
1854 | if (num == count) | |
1855 | data = NULL; | |
1856 | ||
5ab54cf7 | 1857 | /* Record "descriptor" entity */ |
ddf8abd2 MN |
1858 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
1859 | if (unlikely(ret < 0)) { | |
aa02f172 | 1860 | pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", |
d8df0b61 | 1861 | num, ret); |
ddf8abd2 MN |
1862 | return ret; |
1863 | } | |
1864 | ||
1865 | if (!data) | |
1866 | return _len - len; | |
1867 | ||
f96cbd14 | 1868 | ret = ffs_do_single_desc(data, len, entity, priv); |
ddf8abd2 | 1869 | if (unlikely(ret < 0)) { |
aa02f172 | 1870 | pr_debug("%s returns %d\n", __func__, ret); |
ddf8abd2 MN |
1871 | return ret; |
1872 | } | |
1873 | ||
1874 | len -= ret; | |
1875 | data += ret; | |
1876 | ++num; | |
1877 | } | |
1878 | } | |
1879 | ||
ddf8abd2 MN |
1880 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
1881 | u8 *valuep, struct usb_descriptor_header *desc, | |
1882 | void *priv) | |
1883 | { | |
6d5c1c77 RB |
1884 | struct ffs_desc_helper *helper = priv; |
1885 | struct usb_endpoint_descriptor *d; | |
ddf8abd2 MN |
1886 | |
1887 | ENTER(); | |
1888 | ||
1889 | switch (type) { | |
1890 | case FFS_DESCRIPTOR: | |
1891 | break; | |
1892 | ||
1893 | case FFS_INTERFACE: | |
5ab54cf7 MN |
1894 | /* |
1895 | * Interfaces are indexed from zero so if we | |
ddf8abd2 | 1896 | * encountered interface "n" then there are at least |
5ab54cf7 MN |
1897 | * "n+1" interfaces. |
1898 | */ | |
6d5c1c77 RB |
1899 | if (*valuep >= helper->interfaces_count) |
1900 | helper->interfaces_count = *valuep + 1; | |
ddf8abd2 MN |
1901 | break; |
1902 | ||
1903 | case FFS_STRING: | |
5ab54cf7 MN |
1904 | /* |
1905 | * Strings are indexed from 1 (0 is magic ;) reserved | |
1906 | * for languages list or some such) | |
1907 | */ | |
6d5c1c77 RB |
1908 | if (*valuep > helper->ffs->strings_count) |
1909 | helper->ffs->strings_count = *valuep; | |
ddf8abd2 MN |
1910 | break; |
1911 | ||
1912 | case FFS_ENDPOINT: | |
6d5c1c77 RB |
1913 | d = (void *)desc; |
1914 | helper->eps_count++; | |
1915 | if (helper->eps_count >= 15) | |
1916 | return -EINVAL; | |
1917 | /* Check if descriptors for any speed were already parsed */ | |
1918 | if (!helper->ffs->eps_count && !helper->ffs->interfaces_count) | |
1919 | helper->ffs->eps_addrmap[helper->eps_count] = | |
1920 | d->bEndpointAddress; | |
1921 | else if (helper->ffs->eps_addrmap[helper->eps_count] != | |
1922 | d->bEndpointAddress) | |
1923 | return -EINVAL; | |
ddf8abd2 MN |
1924 | break; |
1925 | } | |
1926 | ||
1927 | return 0; | |
1928 | } | |
1929 | ||
f0175ab5 AP |
1930 | static int __ffs_do_os_desc_header(enum ffs_os_desc_type *next_type, |
1931 | struct usb_os_desc_header *desc) | |
1932 | { | |
1933 | u16 bcd_version = le16_to_cpu(desc->bcdVersion); | |
1934 | u16 w_index = le16_to_cpu(desc->wIndex); | |
1935 | ||
1936 | if (bcd_version != 1) { | |
1937 | pr_vdebug("unsupported os descriptors version: %d", | |
1938 | bcd_version); | |
1939 | return -EINVAL; | |
1940 | } | |
1941 | switch (w_index) { | |
1942 | case 0x4: | |
1943 | *next_type = FFS_OS_DESC_EXT_COMPAT; | |
1944 | break; | |
1945 | case 0x5: | |
1946 | *next_type = FFS_OS_DESC_EXT_PROP; | |
1947 | break; | |
1948 | default: | |
1949 | pr_vdebug("unsupported os descriptor type: %d", w_index); | |
1950 | return -EINVAL; | |
1951 | } | |
1952 | ||
1953 | return sizeof(*desc); | |
1954 | } | |
1955 | ||
1956 | /* | |
1957 | * Process all extended compatibility/extended property descriptors | |
1958 | * of a feature descriptor | |
1959 | */ | |
1960 | static int __must_check ffs_do_single_os_desc(char *data, unsigned len, | |
1961 | enum ffs_os_desc_type type, | |
1962 | u16 feature_count, | |
1963 | ffs_os_desc_callback entity, | |
1964 | void *priv, | |
1965 | struct usb_os_desc_header *h) | |
1966 | { | |
1967 | int ret; | |
1968 | const unsigned _len = len; | |
1969 | ||
1970 | ENTER(); | |
1971 | ||
1972 | /* loop over all ext compat/ext prop descriptors */ | |
1973 | while (feature_count--) { | |
1974 | ret = entity(type, h, data, len, priv); | |
1975 | if (unlikely(ret < 0)) { | |
1976 | pr_debug("bad OS descriptor, type: %d\n", type); | |
1977 | return ret; | |
1978 | } | |
1979 | data += ret; | |
1980 | len -= ret; | |
1981 | } | |
1982 | return _len - len; | |
1983 | } | |
1984 | ||
1985 | /* Process a number of complete Feature Descriptors (Ext Compat or Ext Prop) */ | |
1986 | static int __must_check ffs_do_os_descs(unsigned count, | |
1987 | char *data, unsigned len, | |
1988 | ffs_os_desc_callback entity, void *priv) | |
1989 | { | |
1990 | const unsigned _len = len; | |
1991 | unsigned long num = 0; | |
1992 | ||
1993 | ENTER(); | |
1994 | ||
1995 | for (num = 0; num < count; ++num) { | |
1996 | int ret; | |
1997 | enum ffs_os_desc_type type; | |
1998 | u16 feature_count; | |
1999 | struct usb_os_desc_header *desc = (void *)data; | |
2000 | ||
2001 | if (len < sizeof(*desc)) | |
2002 | return -EINVAL; | |
2003 | ||
2004 | /* | |
2005 | * Record "descriptor" entity. | |
2006 | * Process dwLength, bcdVersion, wIndex, get b/wCount. | |
2007 | * Move the data pointer to the beginning of extended | |
2008 | * compatibilities proper or extended properties proper | |
2009 | * portions of the data | |
2010 | */ | |
2011 | if (le32_to_cpu(desc->dwLength) > len) | |
2012 | return -EINVAL; | |
2013 | ||
2014 | ret = __ffs_do_os_desc_header(&type, desc); | |
2015 | if (unlikely(ret < 0)) { | |
2016 | pr_debug("entity OS_DESCRIPTOR(%02lx); ret = %d\n", | |
2017 | num, ret); | |
2018 | return ret; | |
2019 | } | |
2020 | /* | |
2021 | * 16-bit hex "?? 00" Little Endian looks like 8-bit hex "??" | |
2022 | */ | |
2023 | feature_count = le16_to_cpu(desc->wCount); | |
2024 | if (type == FFS_OS_DESC_EXT_COMPAT && | |
2025 | (feature_count > 255 || desc->Reserved)) | |
2026 | return -EINVAL; | |
2027 | len -= ret; | |
2028 | data += ret; | |
2029 | ||
2030 | /* | |
2031 | * Process all function/property descriptors | |
2032 | * of this Feature Descriptor | |
2033 | */ | |
2034 | ret = ffs_do_single_os_desc(data, len, type, | |
2035 | feature_count, entity, priv, desc); | |
2036 | if (unlikely(ret < 0)) { | |
2037 | pr_debug("%s returns %d\n", __func__, ret); | |
2038 | return ret; | |
2039 | } | |
2040 | ||
2041 | len -= ret; | |
2042 | data += ret; | |
2043 | } | |
2044 | return _len - len; | |
2045 | } | |
2046 | ||
2047 | /** | |
2048 | * Validate contents of the buffer from userspace related to OS descriptors. | |
2049 | */ | |
2050 | static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, | |
2051 | struct usb_os_desc_header *h, void *data, | |
2052 | unsigned len, void *priv) | |
2053 | { | |
2054 | struct ffs_data *ffs = priv; | |
2055 | u8 length; | |
2056 | ||
2057 | ENTER(); | |
2058 | ||
2059 | switch (type) { | |
2060 | case FFS_OS_DESC_EXT_COMPAT: { | |
2061 | struct usb_ext_compat_desc *d = data; | |
2062 | int i; | |
2063 | ||
2064 | if (len < sizeof(*d) || | |
2065 | d->bFirstInterfaceNumber >= ffs->interfaces_count || | |
2066 | d->Reserved1) | |
2067 | return -EINVAL; | |
2068 | for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) | |
2069 | if (d->Reserved2[i]) | |
2070 | return -EINVAL; | |
2071 | ||
2072 | length = sizeof(struct usb_ext_compat_desc); | |
2073 | } | |
2074 | break; | |
2075 | case FFS_OS_DESC_EXT_PROP: { | |
2076 | struct usb_ext_prop_desc *d = data; | |
2077 | u32 type, pdl; | |
2078 | u16 pnl; | |
2079 | ||
2080 | if (len < sizeof(*d) || h->interface >= ffs->interfaces_count) | |
2081 | return -EINVAL; | |
2082 | length = le32_to_cpu(d->dwSize); | |
2083 | type = le32_to_cpu(d->dwPropertyDataType); | |
2084 | if (type < USB_EXT_PROP_UNICODE || | |
2085 | type > USB_EXT_PROP_UNICODE_MULTI) { | |
2086 | pr_vdebug("unsupported os descriptor property type: %d", | |
2087 | type); | |
2088 | return -EINVAL; | |
2089 | } | |
2090 | pnl = le16_to_cpu(d->wPropertyNameLength); | |
2091 | pdl = le32_to_cpu(*(u32 *)((u8 *)data + 10 + pnl)); | |
2092 | if (length != 14 + pnl + pdl) { | |
2093 | pr_vdebug("invalid os descriptor length: %d pnl:%d pdl:%d (descriptor %d)\n", | |
2094 | length, pnl, pdl, type); | |
2095 | return -EINVAL; | |
2096 | } | |
2097 | ++ffs->ms_os_descs_ext_prop_count; | |
2098 | /* property name reported to the host as "WCHAR"s */ | |
2099 | ffs->ms_os_descs_ext_prop_name_len += pnl * 2; | |
2100 | ffs->ms_os_descs_ext_prop_data_len += pdl; | |
2101 | } | |
2102 | break; | |
2103 | default: | |
2104 | pr_vdebug("unknown descriptor: %d\n", type); | |
2105 | return -EINVAL; | |
2106 | } | |
2107 | return length; | |
2108 | } | |
2109 | ||
ddf8abd2 MN |
2110 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
2111 | char *const _data, size_t len) | |
2112 | { | |
ac8dde11 | 2113 | char *data = _data, *raw_descs; |
f0175ab5 | 2114 | unsigned os_descs_count = 0, counts[3], flags; |
ac8dde11 | 2115 | int ret = -EINVAL, i; |
6d5c1c77 | 2116 | struct ffs_desc_helper helper; |
ddf8abd2 MN |
2117 | |
2118 | ENTER(); | |
2119 | ||
ac8dde11 | 2120 | if (get_unaligned_le32(data + 4) != len) |
ddf8abd2 | 2121 | goto error; |
ddf8abd2 | 2122 | |
ac8dde11 MN |
2123 | switch (get_unaligned_le32(data)) { |
2124 | case FUNCTIONFS_DESCRIPTORS_MAGIC: | |
2125 | flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; | |
2126 | data += 8; | |
2127 | len -= 8; | |
2128 | break; | |
2129 | case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: | |
2130 | flags = get_unaligned_le32(data + 8); | |
1b0bf88f | 2131 | ffs->user_flags = flags; |
ac8dde11 MN |
2132 | if (flags & ~(FUNCTIONFS_HAS_FS_DESC | |
2133 | FUNCTIONFS_HAS_HS_DESC | | |
f0175ab5 | 2134 | FUNCTIONFS_HAS_SS_DESC | |
1b0bf88f | 2135 | FUNCTIONFS_HAS_MS_OS_DESC | |
5e33f6fd RB |
2136 | FUNCTIONFS_VIRTUAL_ADDR | |
2137 | FUNCTIONFS_EVENTFD)) { | |
ac8dde11 | 2138 | ret = -ENOSYS; |
ddf8abd2 MN |
2139 | goto error; |
2140 | } | |
ac8dde11 MN |
2141 | data += 12; |
2142 | len -= 12; | |
2143 | break; | |
2144 | default: | |
2145 | goto error; | |
ddf8abd2 | 2146 | } |
ddf8abd2 | 2147 | |
5e33f6fd RB |
2148 | if (flags & FUNCTIONFS_EVENTFD) { |
2149 | if (len < 4) | |
2150 | goto error; | |
2151 | ffs->ffs_eventfd = | |
2152 | eventfd_ctx_fdget((int)get_unaligned_le32(data)); | |
2153 | if (IS_ERR(ffs->ffs_eventfd)) { | |
2154 | ret = PTR_ERR(ffs->ffs_eventfd); | |
2155 | ffs->ffs_eventfd = NULL; | |
2156 | goto error; | |
2157 | } | |
2158 | data += 4; | |
2159 | len -= 4; | |
2160 | } | |
2161 | ||
ac8dde11 MN |
2162 | /* Read fs_count, hs_count and ss_count (if present) */ |
2163 | for (i = 0; i < 3; ++i) { | |
2164 | if (!(flags & (1 << i))) { | |
2165 | counts[i] = 0; | |
2166 | } else if (len < 4) { | |
8d4e897b | 2167 | goto error; |
ac8dde11 MN |
2168 | } else { |
2169 | counts[i] = get_unaligned_le32(data); | |
2170 | data += 4; | |
2171 | len -= 4; | |
8d4e897b | 2172 | } |
ddf8abd2 | 2173 | } |
f0175ab5 AP |
2174 | if (flags & (1 << i)) { |
2175 | os_descs_count = get_unaligned_le32(data); | |
2176 | data += 4; | |
2177 | len -= 4; | |
2178 | }; | |
ddf8abd2 | 2179 | |
ac8dde11 MN |
2180 | /* Read descriptors */ |
2181 | raw_descs = data; | |
6d5c1c77 | 2182 | helper.ffs = ffs; |
ac8dde11 MN |
2183 | for (i = 0; i < 3; ++i) { |
2184 | if (!counts[i]) | |
2185 | continue; | |
6d5c1c77 RB |
2186 | helper.interfaces_count = 0; |
2187 | helper.eps_count = 0; | |
ac8dde11 | 2188 | ret = ffs_do_descs(counts[i], data, len, |
6d5c1c77 | 2189 | __ffs_data_do_entity, &helper); |
ac8dde11 | 2190 | if (ret < 0) |
ddf8abd2 | 2191 | goto error; |
6d5c1c77 RB |
2192 | if (!ffs->eps_count && !ffs->interfaces_count) { |
2193 | ffs->eps_count = helper.eps_count; | |
2194 | ffs->interfaces_count = helper.interfaces_count; | |
2195 | } else { | |
2196 | if (ffs->eps_count != helper.eps_count) { | |
2197 | ret = -EINVAL; | |
2198 | goto error; | |
2199 | } | |
2200 | if (ffs->interfaces_count != helper.interfaces_count) { | |
2201 | ret = -EINVAL; | |
2202 | goto error; | |
2203 | } | |
2204 | } | |
ac8dde11 MN |
2205 | data += ret; |
2206 | len -= ret; | |
ddf8abd2 | 2207 | } |
f0175ab5 AP |
2208 | if (os_descs_count) { |
2209 | ret = ffs_do_os_descs(os_descs_count, data, len, | |
2210 | __ffs_data_do_os_desc, ffs); | |
2211 | if (ret < 0) | |
2212 | goto error; | |
2213 | data += ret; | |
2214 | len -= ret; | |
2215 | } | |
ddf8abd2 | 2216 | |
ac8dde11 MN |
2217 | if (raw_descs == data || len) { |
2218 | ret = -EINVAL; | |
2219 | goto error; | |
2220 | } | |
ddf8abd2 | 2221 | |
ac8dde11 MN |
2222 | ffs->raw_descs_data = _data; |
2223 | ffs->raw_descs = raw_descs; | |
2224 | ffs->raw_descs_length = data - raw_descs; | |
2225 | ffs->fs_descs_count = counts[0]; | |
2226 | ffs->hs_descs_count = counts[1]; | |
2227 | ffs->ss_descs_count = counts[2]; | |
f0175ab5 | 2228 | ffs->ms_os_descs_count = os_descs_count; |
ddf8abd2 MN |
2229 | |
2230 | return 0; | |
2231 | ||
ddf8abd2 MN |
2232 | error: |
2233 | kfree(_data); | |
2234 | return ret; | |
2235 | } | |
2236 | ||
ddf8abd2 MN |
2237 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
2238 | char *const _data, size_t len) | |
2239 | { | |
2240 | u32 str_count, needed_count, lang_count; | |
2241 | struct usb_gadget_strings **stringtabs, *t; | |
2242 | struct usb_string *strings, *s; | |
2243 | const char *data = _data; | |
2244 | ||
2245 | ENTER(); | |
2246 | ||
2247 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || | |
2248 | get_unaligned_le32(data + 4) != len)) | |
2249 | goto error; | |
2250 | str_count = get_unaligned_le32(data + 8); | |
2251 | lang_count = get_unaligned_le32(data + 12); | |
2252 | ||
2253 | /* if one is zero the other must be zero */ | |
2254 | if (unlikely(!str_count != !lang_count)) | |
2255 | goto error; | |
2256 | ||
2257 | /* Do we have at least as many strings as descriptors need? */ | |
2258 | needed_count = ffs->strings_count; | |
2259 | if (unlikely(str_count < needed_count)) | |
2260 | goto error; | |
2261 | ||
5ab54cf7 MN |
2262 | /* |
2263 | * If we don't need any strings just return and free all | |
2264 | * memory. | |
2265 | */ | |
ddf8abd2 MN |
2266 | if (!needed_count) { |
2267 | kfree(_data); | |
2268 | return 0; | |
2269 | } | |
2270 | ||
5ab54cf7 | 2271 | /* Allocate everything in one chunk so there's less maintenance. */ |
ddf8abd2 | 2272 | { |
ddf8abd2 | 2273 | unsigned i = 0; |
e6f3862f AP |
2274 | vla_group(d); |
2275 | vla_item(d, struct usb_gadget_strings *, stringtabs, | |
2276 | lang_count + 1); | |
2277 | vla_item(d, struct usb_gadget_strings, stringtab, lang_count); | |
2278 | vla_item(d, struct usb_string, strings, | |
2279 | lang_count*(needed_count+1)); | |
ddf8abd2 | 2280 | |
e6f3862f AP |
2281 | char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); |
2282 | ||
2283 | if (unlikely(!vlabuf)) { | |
ddf8abd2 MN |
2284 | kfree(_data); |
2285 | return -ENOMEM; | |
2286 | } | |
2287 | ||
e6f3862f AP |
2288 | /* Initialize the VLA pointers */ |
2289 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2290 | t = vla_ptr(vlabuf, d, stringtab); | |
ddf8abd2 MN |
2291 | i = lang_count; |
2292 | do { | |
2293 | *stringtabs++ = t++; | |
2294 | } while (--i); | |
2295 | *stringtabs = NULL; | |
2296 | ||
e6f3862f AP |
2297 | /* stringtabs = vlabuf = d_stringtabs for later kfree */ |
2298 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2299 | t = vla_ptr(vlabuf, d, stringtab); | |
2300 | s = vla_ptr(vlabuf, d, strings); | |
ddf8abd2 MN |
2301 | strings = s; |
2302 | } | |
2303 | ||
2304 | /* For each language */ | |
2305 | data += 16; | |
2306 | len -= 16; | |
2307 | ||
2308 | do { /* lang_count > 0 so we can use do-while */ | |
2309 | unsigned needed = needed_count; | |
2310 | ||
2311 | if (unlikely(len < 3)) | |
2312 | goto error_free; | |
2313 | t->language = get_unaligned_le16(data); | |
2314 | t->strings = s; | |
2315 | ++t; | |
2316 | ||
2317 | data += 2; | |
2318 | len -= 2; | |
2319 | ||
2320 | /* For each string */ | |
2321 | do { /* str_count > 0 so we can use do-while */ | |
2322 | size_t length = strnlen(data, len); | |
2323 | ||
2324 | if (unlikely(length == len)) | |
2325 | goto error_free; | |
2326 | ||
5ab54cf7 MN |
2327 | /* |
2328 | * User may provide more strings then we need, | |
2329 | * if that's the case we simply ignore the | |
2330 | * rest | |
2331 | */ | |
ddf8abd2 | 2332 | if (likely(needed)) { |
5ab54cf7 MN |
2333 | /* |
2334 | * s->id will be set while adding | |
ddf8abd2 | 2335 | * function to configuration so for |
5ab54cf7 MN |
2336 | * now just leave garbage here. |
2337 | */ | |
ddf8abd2 MN |
2338 | s->s = data; |
2339 | --needed; | |
2340 | ++s; | |
2341 | } | |
2342 | ||
2343 | data += length + 1; | |
2344 | len -= length + 1; | |
2345 | } while (--str_count); | |
2346 | ||
2347 | s->id = 0; /* terminator */ | |
2348 | s->s = NULL; | |
2349 | ++s; | |
2350 | ||
2351 | } while (--lang_count); | |
2352 | ||
2353 | /* Some garbage left? */ | |
2354 | if (unlikely(len)) | |
2355 | goto error_free; | |
2356 | ||
2357 | /* Done! */ | |
2358 | ffs->stringtabs = stringtabs; | |
2359 | ffs->raw_strings = _data; | |
2360 | ||
2361 | return 0; | |
2362 | ||
2363 | error_free: | |
2364 | kfree(stringtabs); | |
2365 | error: | |
2366 | kfree(_data); | |
2367 | return -EINVAL; | |
2368 | } | |
2369 | ||
2370 | ||
ddf8abd2 MN |
2371 | /* Events handling and management *******************************************/ |
2372 | ||
2373 | static void __ffs_event_add(struct ffs_data *ffs, | |
2374 | enum usb_functionfs_event_type type) | |
2375 | { | |
2376 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; | |
2377 | int neg = 0; | |
2378 | ||
5ab54cf7 MN |
2379 | /* |
2380 | * Abort any unhandled setup | |
2381 | * | |
2382 | * We do not need to worry about some cmpxchg() changing value | |
ddf8abd2 MN |
2383 | * of ffs->setup_state without holding the lock because when |
2384 | * state is FFS_SETUP_PENDING cmpxchg() in several places in | |
5ab54cf7 MN |
2385 | * the source does nothing. |
2386 | */ | |
ddf8abd2 | 2387 | if (ffs->setup_state == FFS_SETUP_PENDING) |
e46318a0 | 2388 | ffs->setup_state = FFS_SETUP_CANCELLED; |
ddf8abd2 | 2389 | |
67913bbd MN |
2390 | /* |
2391 | * Logic of this function guarantees that there are at most four pending | |
2392 | * evens on ffs->ev.types queue. This is important because the queue | |
2393 | * has space for four elements only and __ffs_ep0_read_events function | |
2394 | * depends on that limit as well. If more event types are added, those | |
2395 | * limits have to be revisited or guaranteed to still hold. | |
2396 | */ | |
ddf8abd2 MN |
2397 | switch (type) { |
2398 | case FUNCTIONFS_RESUME: | |
2399 | rem_type2 = FUNCTIONFS_SUSPEND; | |
5ab54cf7 | 2400 | /* FALL THROUGH */ |
ddf8abd2 MN |
2401 | case FUNCTIONFS_SUSPEND: |
2402 | case FUNCTIONFS_SETUP: | |
2403 | rem_type1 = type; | |
5ab54cf7 | 2404 | /* Discard all similar events */ |
ddf8abd2 MN |
2405 | break; |
2406 | ||
2407 | case FUNCTIONFS_BIND: | |
2408 | case FUNCTIONFS_UNBIND: | |
2409 | case FUNCTIONFS_DISABLE: | |
2410 | case FUNCTIONFS_ENABLE: | |
5ab54cf7 | 2411 | /* Discard everything other then power management. */ |
ddf8abd2 MN |
2412 | rem_type1 = FUNCTIONFS_SUSPEND; |
2413 | rem_type2 = FUNCTIONFS_RESUME; | |
2414 | neg = 1; | |
2415 | break; | |
2416 | ||
2417 | default: | |
fe00bcbf MN |
2418 | WARN(1, "%d: unknown event, this should not happen\n", type); |
2419 | return; | |
ddf8abd2 MN |
2420 | } |
2421 | ||
2422 | { | |
2423 | u8 *ev = ffs->ev.types, *out = ev; | |
2424 | unsigned n = ffs->ev.count; | |
2425 | for (; n; --n, ++ev) | |
2426 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) | |
2427 | *out++ = *ev; | |
2428 | else | |
aa02f172 | 2429 | pr_vdebug("purging event %d\n", *ev); |
ddf8abd2 MN |
2430 | ffs->ev.count = out - ffs->ev.types; |
2431 | } | |
2432 | ||
aa02f172 | 2433 | pr_vdebug("adding event %d\n", type); |
ddf8abd2 MN |
2434 | ffs->ev.types[ffs->ev.count++] = type; |
2435 | wake_up_locked(&ffs->ev.waitq); | |
5e33f6fd RB |
2436 | if (ffs->ffs_eventfd) |
2437 | eventfd_signal(ffs->ffs_eventfd, 1); | |
ddf8abd2 MN |
2438 | } |
2439 | ||
2440 | static void ffs_event_add(struct ffs_data *ffs, | |
2441 | enum usb_functionfs_event_type type) | |
2442 | { | |
2443 | unsigned long flags; | |
2444 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2445 | __ffs_event_add(ffs, type); | |
2446 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2447 | } | |
2448 | ||
ddf8abd2 MN |
2449 | /* Bind/unbind USB function hooks *******************************************/ |
2450 | ||
6d5c1c77 RB |
2451 | static int ffs_ep_addr2idx(struct ffs_data *ffs, u8 endpoint_address) |
2452 | { | |
2453 | int i; | |
2454 | ||
2455 | for (i = 1; i < ARRAY_SIZE(ffs->eps_addrmap); ++i) | |
2456 | if (ffs->eps_addrmap[i] == endpoint_address) | |
2457 | return i; | |
2458 | return -ENOENT; | |
2459 | } | |
2460 | ||
ddf8abd2 MN |
2461 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, |
2462 | struct usb_descriptor_header *desc, | |
2463 | void *priv) | |
2464 | { | |
2465 | struct usb_endpoint_descriptor *ds = (void *)desc; | |
2466 | struct ffs_function *func = priv; | |
2467 | struct ffs_ep *ffs_ep; | |
85b06f5e DC |
2468 | unsigned ep_desc_id; |
2469 | int idx; | |
8d4e897b | 2470 | static const char *speed_names[] = { "full", "high", "super" }; |
ddf8abd2 MN |
2471 | |
2472 | if (type != FFS_DESCRIPTOR) | |
2473 | return 0; | |
2474 | ||
8d4e897b MG |
2475 | /* |
2476 | * If ss_descriptors is not NULL, we are reading super speed | |
2477 | * descriptors; if hs_descriptors is not NULL, we are reading high | |
2478 | * speed descriptors; otherwise, we are reading full speed | |
2479 | * descriptors. | |
2480 | */ | |
2481 | if (func->function.ss_descriptors) { | |
2482 | ep_desc_id = 2; | |
2483 | func->function.ss_descriptors[(long)valuep] = desc; | |
2484 | } else if (func->function.hs_descriptors) { | |
2485 | ep_desc_id = 1; | |
ddf8abd2 | 2486 | func->function.hs_descriptors[(long)valuep] = desc; |
8d4e897b MG |
2487 | } else { |
2488 | ep_desc_id = 0; | |
10287bae | 2489 | func->function.fs_descriptors[(long)valuep] = desc; |
8d4e897b | 2490 | } |
ddf8abd2 MN |
2491 | |
2492 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) | |
2493 | return 0; | |
2494 | ||
6d5c1c77 RB |
2495 | idx = ffs_ep_addr2idx(func->ffs, ds->bEndpointAddress) - 1; |
2496 | if (idx < 0) | |
2497 | return idx; | |
2498 | ||
ddf8abd2 MN |
2499 | ffs_ep = func->eps + idx; |
2500 | ||
8d4e897b MG |
2501 | if (unlikely(ffs_ep->descs[ep_desc_id])) { |
2502 | pr_err("two %sspeed descriptors for EP %d\n", | |
2503 | speed_names[ep_desc_id], | |
d8df0b61 | 2504 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
ddf8abd2 MN |
2505 | return -EINVAL; |
2506 | } | |
8d4e897b | 2507 | ffs_ep->descs[ep_desc_id] = ds; |
ddf8abd2 MN |
2508 | |
2509 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); | |
2510 | if (ffs_ep->ep) { | |
2511 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; | |
2512 | if (!ds->wMaxPacketSize) | |
2513 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; | |
2514 | } else { | |
2515 | struct usb_request *req; | |
2516 | struct usb_ep *ep; | |
1b0bf88f | 2517 | u8 bEndpointAddress; |
ddf8abd2 | 2518 | |
1b0bf88f RB |
2519 | /* |
2520 | * We back up bEndpointAddress because autoconfig overwrites | |
2521 | * it with physical endpoint address. | |
2522 | */ | |
2523 | bEndpointAddress = ds->bEndpointAddress; | |
aa02f172 | 2524 | pr_vdebug("autoconfig\n"); |
ddf8abd2 MN |
2525 | ep = usb_ep_autoconfig(func->gadget, ds); |
2526 | if (unlikely(!ep)) | |
2527 | return -ENOTSUPP; | |
cc7e6056 | 2528 | ep->driver_data = func->eps + idx; |
ddf8abd2 MN |
2529 | |
2530 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
2531 | if (unlikely(!req)) | |
2532 | return -ENOMEM; | |
2533 | ||
2534 | ffs_ep->ep = ep; | |
2535 | ffs_ep->req = req; | |
2536 | func->eps_revmap[ds->bEndpointAddress & | |
2537 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; | |
1b0bf88f RB |
2538 | /* |
2539 | * If we use virtual address mapping, we restore | |
2540 | * original bEndpointAddress value. | |
2541 | */ | |
2542 | if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) | |
2543 | ds->bEndpointAddress = bEndpointAddress; | |
ddf8abd2 MN |
2544 | } |
2545 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); | |
2546 | ||
2547 | return 0; | |
2548 | } | |
2549 | ||
ddf8abd2 MN |
2550 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, |
2551 | struct usb_descriptor_header *desc, | |
2552 | void *priv) | |
2553 | { | |
2554 | struct ffs_function *func = priv; | |
2555 | unsigned idx; | |
2556 | u8 newValue; | |
2557 | ||
2558 | switch (type) { | |
2559 | default: | |
2560 | case FFS_DESCRIPTOR: | |
2561 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ | |
2562 | return 0; | |
2563 | ||
2564 | case FFS_INTERFACE: | |
2565 | idx = *valuep; | |
2566 | if (func->interfaces_nums[idx] < 0) { | |
2567 | int id = usb_interface_id(func->conf, &func->function); | |
2568 | if (unlikely(id < 0)) | |
2569 | return id; | |
2570 | func->interfaces_nums[idx] = id; | |
2571 | } | |
2572 | newValue = func->interfaces_nums[idx]; | |
2573 | break; | |
2574 | ||
2575 | case FFS_STRING: | |
2576 | /* String' IDs are allocated when fsf_data is bound to cdev */ | |
2577 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; | |
2578 | break; | |
2579 | ||
2580 | case FFS_ENDPOINT: | |
5ab54cf7 MN |
2581 | /* |
2582 | * USB_DT_ENDPOINT are handled in | |
2583 | * __ffs_func_bind_do_descs(). | |
2584 | */ | |
ddf8abd2 MN |
2585 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
2586 | return 0; | |
2587 | ||
2588 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2589 | if (unlikely(!func->eps[idx].ep)) | |
2590 | return -EINVAL; | |
2591 | ||
2592 | { | |
2593 | struct usb_endpoint_descriptor **descs; | |
2594 | descs = func->eps[idx].descs; | |
2595 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; | |
2596 | } | |
2597 | break; | |
2598 | } | |
2599 | ||
aa02f172 | 2600 | pr_vdebug("%02x -> %02x\n", *valuep, newValue); |
ddf8abd2 MN |
2601 | *valuep = newValue; |
2602 | return 0; | |
2603 | } | |
2604 | ||
f0175ab5 AP |
2605 | static int __ffs_func_bind_do_os_desc(enum ffs_os_desc_type type, |
2606 | struct usb_os_desc_header *h, void *data, | |
2607 | unsigned len, void *priv) | |
2608 | { | |
2609 | struct ffs_function *func = priv; | |
2610 | u8 length = 0; | |
2611 | ||
2612 | switch (type) { | |
2613 | case FFS_OS_DESC_EXT_COMPAT: { | |
2614 | struct usb_ext_compat_desc *desc = data; | |
2615 | struct usb_os_desc_table *t; | |
2616 | ||
2617 | t = &func->function.os_desc_table[desc->bFirstInterfaceNumber]; | |
2618 | t->if_id = func->interfaces_nums[desc->bFirstInterfaceNumber]; | |
2619 | memcpy(t->os_desc->ext_compat_id, &desc->CompatibleID, | |
2620 | ARRAY_SIZE(desc->CompatibleID) + | |
2621 | ARRAY_SIZE(desc->SubCompatibleID)); | |
2622 | length = sizeof(*desc); | |
2623 | } | |
2624 | break; | |
2625 | case FFS_OS_DESC_EXT_PROP: { | |
2626 | struct usb_ext_prop_desc *desc = data; | |
2627 | struct usb_os_desc_table *t; | |
2628 | struct usb_os_desc_ext_prop *ext_prop; | |
2629 | char *ext_prop_name; | |
2630 | char *ext_prop_data; | |
2631 | ||
2632 | t = &func->function.os_desc_table[h->interface]; | |
2633 | t->if_id = func->interfaces_nums[h->interface]; | |
2634 | ||
2635 | ext_prop = func->ffs->ms_os_descs_ext_prop_avail; | |
2636 | func->ffs->ms_os_descs_ext_prop_avail += sizeof(*ext_prop); | |
2637 | ||
2638 | ext_prop->type = le32_to_cpu(desc->dwPropertyDataType); | |
2639 | ext_prop->name_len = le16_to_cpu(desc->wPropertyNameLength); | |
2640 | ext_prop->data_len = le32_to_cpu(*(u32 *) | |
2641 | usb_ext_prop_data_len_ptr(data, ext_prop->name_len)); | |
2642 | length = ext_prop->name_len + ext_prop->data_len + 14; | |
2643 | ||
2644 | ext_prop_name = func->ffs->ms_os_descs_ext_prop_name_avail; | |
2645 | func->ffs->ms_os_descs_ext_prop_name_avail += | |
2646 | ext_prop->name_len; | |
2647 | ||
2648 | ext_prop_data = func->ffs->ms_os_descs_ext_prop_data_avail; | |
2649 | func->ffs->ms_os_descs_ext_prop_data_avail += | |
2650 | ext_prop->data_len; | |
2651 | memcpy(ext_prop_data, | |
2652 | usb_ext_prop_data_ptr(data, ext_prop->name_len), | |
2653 | ext_prop->data_len); | |
2654 | /* unicode data reported to the host as "WCHAR"s */ | |
2655 | switch (ext_prop->type) { | |
2656 | case USB_EXT_PROP_UNICODE: | |
2657 | case USB_EXT_PROP_UNICODE_ENV: | |
2658 | case USB_EXT_PROP_UNICODE_LINK: | |
2659 | case USB_EXT_PROP_UNICODE_MULTI: | |
2660 | ext_prop->data_len *= 2; | |
2661 | break; | |
2662 | } | |
2663 | ext_prop->data = ext_prop_data; | |
2664 | ||
2665 | memcpy(ext_prop_name, usb_ext_prop_name_ptr(data), | |
2666 | ext_prop->name_len); | |
2667 | /* property name reported to the host as "WCHAR"s */ | |
2668 | ext_prop->name_len *= 2; | |
2669 | ext_prop->name = ext_prop_name; | |
2670 | ||
2671 | t->os_desc->ext_prop_len += | |
2672 | ext_prop->name_len + ext_prop->data_len + 14; | |
2673 | ++t->os_desc->ext_prop_count; | |
2674 | list_add_tail(&ext_prop->entry, &t->os_desc->ext_prop); | |
2675 | } | |
2676 | break; | |
2677 | default: | |
2678 | pr_vdebug("unknown descriptor: %d\n", type); | |
2679 | } | |
2680 | ||
2681 | return length; | |
2682 | } | |
2683 | ||
5920cda6 AP |
2684 | static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, |
2685 | struct usb_configuration *c) | |
2686 | { | |
2687 | struct ffs_function *func = ffs_func_from_usb(f); | |
2688 | struct f_fs_opts *ffs_opts = | |
2689 | container_of(f->fi, struct f_fs_opts, func_inst); | |
2690 | int ret; | |
2691 | ||
2692 | ENTER(); | |
2693 | ||
2694 | /* | |
2695 | * Legacy gadget triggers binding in functionfs_ready_callback, | |
2696 | * which already uses locking; taking the same lock here would | |
2697 | * cause a deadlock. | |
2698 | * | |
2699 | * Configfs-enabled gadgets however do need ffs_dev_lock. | |
2700 | */ | |
2701 | if (!ffs_opts->no_configfs) | |
2702 | ffs_dev_lock(); | |
2703 | ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; | |
2704 | func->ffs = ffs_opts->dev->ffs_data; | |
2705 | if (!ffs_opts->no_configfs) | |
2706 | ffs_dev_unlock(); | |
2707 | if (ret) | |
2708 | return ERR_PTR(ret); | |
2709 | ||
2710 | func->conf = c; | |
2711 | func->gadget = c->cdev->gadget; | |
2712 | ||
5920cda6 AP |
2713 | /* |
2714 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
2715 | * configurations are bound in sequence with list_for_each_entry, | |
2716 | * in each configuration its functions are bound in sequence | |
2717 | * with list_for_each_entry, so we assume no race condition | |
2718 | * with regard to ffs_opts->bound access | |
2719 | */ | |
2720 | if (!ffs_opts->refcnt) { | |
2721 | ret = functionfs_bind(func->ffs, c->cdev); | |
2722 | if (ret) | |
2723 | return ERR_PTR(ret); | |
2724 | } | |
2725 | ffs_opts->refcnt++; | |
2726 | func->function.strings = func->ffs->stringtabs; | |
2727 | ||
2728 | return ffs_opts; | |
2729 | } | |
5920cda6 AP |
2730 | |
2731 | static int _ffs_func_bind(struct usb_configuration *c, | |
2732 | struct usb_function *f) | |
ddf8abd2 MN |
2733 | { |
2734 | struct ffs_function *func = ffs_func_from_usb(f); | |
2735 | struct ffs_data *ffs = func->ffs; | |
2736 | ||
2737 | const int full = !!func->ffs->fs_descs_count; | |
2738 | const int high = gadget_is_dualspeed(func->gadget) && | |
2739 | func->ffs->hs_descs_count; | |
8d4e897b MG |
2740 | const int super = gadget_is_superspeed(func->gadget) && |
2741 | func->ffs->ss_descs_count; | |
ddf8abd2 | 2742 | |
f0175ab5 | 2743 | int fs_len, hs_len, ss_len, ret, i; |
ddf8abd2 MN |
2744 | |
2745 | /* Make it a single chunk, less management later on */ | |
e6f3862f AP |
2746 | vla_group(d); |
2747 | vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); | |
2748 | vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, | |
2749 | full ? ffs->fs_descs_count + 1 : 0); | |
2750 | vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, | |
2751 | high ? ffs->hs_descs_count + 1 : 0); | |
8d4e897b MG |
2752 | vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, |
2753 | super ? ffs->ss_descs_count + 1 : 0); | |
e6f3862f | 2754 | vla_item_with_sz(d, short, inums, ffs->interfaces_count); |
f0175ab5 AP |
2755 | vla_item_with_sz(d, struct usb_os_desc_table, os_desc_table, |
2756 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2757 | vla_item_with_sz(d, char[16], ext_compat, | |
2758 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2759 | vla_item_with_sz(d, struct usb_os_desc, os_desc, | |
2760 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2761 | vla_item_with_sz(d, struct usb_os_desc_ext_prop, ext_prop, | |
2762 | ffs->ms_os_descs_ext_prop_count); | |
2763 | vla_item_with_sz(d, char, ext_prop_name, | |
2764 | ffs->ms_os_descs_ext_prop_name_len); | |
2765 | vla_item_with_sz(d, char, ext_prop_data, | |
2766 | ffs->ms_os_descs_ext_prop_data_len); | |
ac8dde11 | 2767 | vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); |
e6f3862f | 2768 | char *vlabuf; |
ddf8abd2 MN |
2769 | |
2770 | ENTER(); | |
2771 | ||
8d4e897b MG |
2772 | /* Has descriptors only for speeds gadget does not support */ |
2773 | if (unlikely(!(full | high | super))) | |
ddf8abd2 MN |
2774 | return -ENOTSUPP; |
2775 | ||
e6f3862f | 2776 | /* Allocate a single chunk, less management later on */ |
f0175ab5 | 2777 | vlabuf = kzalloc(vla_group_size(d), GFP_KERNEL); |
e6f3862f | 2778 | if (unlikely(!vlabuf)) |
ddf8abd2 MN |
2779 | return -ENOMEM; |
2780 | ||
f0175ab5 AP |
2781 | ffs->ms_os_descs_ext_prop_avail = vla_ptr(vlabuf, d, ext_prop); |
2782 | ffs->ms_os_descs_ext_prop_name_avail = | |
2783 | vla_ptr(vlabuf, d, ext_prop_name); | |
2784 | ffs->ms_os_descs_ext_prop_data_avail = | |
2785 | vla_ptr(vlabuf, d, ext_prop_data); | |
2786 | ||
ac8dde11 MN |
2787 | /* Copy descriptors */ |
2788 | memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, | |
2789 | ffs->raw_descs_length); | |
8d4e897b | 2790 | |
e6f3862f AP |
2791 | memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); |
2792 | for (ret = ffs->eps_count; ret; --ret) { | |
2793 | struct ffs_ep *ptr; | |
2794 | ||
2795 | ptr = vla_ptr(vlabuf, d, eps); | |
2796 | ptr[ret].num = -1; | |
2797 | } | |
ddf8abd2 | 2798 | |
e6f3862f AP |
2799 | /* Save pointers |
2800 | * d_eps == vlabuf, func->eps used to kfree vlabuf later | |
2801 | */ | |
2802 | func->eps = vla_ptr(vlabuf, d, eps); | |
2803 | func->interfaces_nums = vla_ptr(vlabuf, d, inums); | |
ddf8abd2 | 2804 | |
5ab54cf7 MN |
2805 | /* |
2806 | * Go through all the endpoint descriptors and allocate | |
ddf8abd2 | 2807 | * endpoints first, so that later we can rewrite the endpoint |
5ab54cf7 MN |
2808 | * numbers without worrying that it may be described later on. |
2809 | */ | |
ddf8abd2 | 2810 | if (likely(full)) { |
e6f3862f | 2811 | func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); |
8d4e897b MG |
2812 | fs_len = ffs_do_descs(ffs->fs_descs_count, |
2813 | vla_ptr(vlabuf, d, raw_descs), | |
2814 | d_raw_descs__sz, | |
2815 | __ffs_func_bind_do_descs, func); | |
2816 | if (unlikely(fs_len < 0)) { | |
2817 | ret = fs_len; | |
ddf8abd2 | 2818 | goto error; |
8d4e897b | 2819 | } |
ddf8abd2 | 2820 | } else { |
8d4e897b | 2821 | fs_len = 0; |
ddf8abd2 MN |
2822 | } |
2823 | ||
2824 | if (likely(high)) { | |
e6f3862f | 2825 | func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); |
8d4e897b MG |
2826 | hs_len = ffs_do_descs(ffs->hs_descs_count, |
2827 | vla_ptr(vlabuf, d, raw_descs) + fs_len, | |
2828 | d_raw_descs__sz - fs_len, | |
2829 | __ffs_func_bind_do_descs, func); | |
2830 | if (unlikely(hs_len < 0)) { | |
2831 | ret = hs_len; | |
2832 | goto error; | |
2833 | } | |
2834 | } else { | |
2835 | hs_len = 0; | |
2836 | } | |
2837 | ||
2838 | if (likely(super)) { | |
2839 | func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); | |
f0175ab5 | 2840 | ss_len = ffs_do_descs(ffs->ss_descs_count, |
8d4e897b MG |
2841 | vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, |
2842 | d_raw_descs__sz - fs_len - hs_len, | |
2843 | __ffs_func_bind_do_descs, func); | |
f0175ab5 AP |
2844 | if (unlikely(ss_len < 0)) { |
2845 | ret = ss_len; | |
8854894c | 2846 | goto error; |
f0175ab5 AP |
2847 | } |
2848 | } else { | |
2849 | ss_len = 0; | |
ddf8abd2 MN |
2850 | } |
2851 | ||
5ab54cf7 MN |
2852 | /* |
2853 | * Now handle interface numbers allocation and interface and | |
2854 | * endpoint numbers rewriting. We can do that in one go | |
2855 | * now. | |
2856 | */ | |
ddf8abd2 | 2857 | ret = ffs_do_descs(ffs->fs_descs_count + |
8d4e897b MG |
2858 | (high ? ffs->hs_descs_count : 0) + |
2859 | (super ? ffs->ss_descs_count : 0), | |
e6f3862f | 2860 | vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, |
ddf8abd2 MN |
2861 | __ffs_func_bind_do_nums, func); |
2862 | if (unlikely(ret < 0)) | |
2863 | goto error; | |
2864 | ||
f0175ab5 AP |
2865 | func->function.os_desc_table = vla_ptr(vlabuf, d, os_desc_table); |
2866 | if (c->cdev->use_os_string) | |
2867 | for (i = 0; i < ffs->interfaces_count; ++i) { | |
2868 | struct usb_os_desc *desc; | |
2869 | ||
2870 | desc = func->function.os_desc_table[i].os_desc = | |
2871 | vla_ptr(vlabuf, d, os_desc) + | |
2872 | i * sizeof(struct usb_os_desc); | |
2873 | desc->ext_compat_id = | |
2874 | vla_ptr(vlabuf, d, ext_compat) + i * 16; | |
2875 | INIT_LIST_HEAD(&desc->ext_prop); | |
2876 | } | |
2877 | ret = ffs_do_os_descs(ffs->ms_os_descs_count, | |
2878 | vla_ptr(vlabuf, d, raw_descs) + | |
2879 | fs_len + hs_len + ss_len, | |
2880 | d_raw_descs__sz - fs_len - hs_len - ss_len, | |
2881 | __ffs_func_bind_do_os_desc, func); | |
2882 | if (unlikely(ret < 0)) | |
2883 | goto error; | |
2884 | func->function.os_desc_n = | |
2885 | c->cdev->use_os_string ? ffs->interfaces_count : 0; | |
2886 | ||
ddf8abd2 MN |
2887 | /* And we're done */ |
2888 | ffs_event_add(ffs, FUNCTIONFS_BIND); | |
2889 | return 0; | |
2890 | ||
2891 | error: | |
2892 | /* XXX Do we need to release all claimed endpoints here? */ | |
2893 | return ret; | |
2894 | } | |
2895 | ||
5920cda6 AP |
2896 | static int ffs_func_bind(struct usb_configuration *c, |
2897 | struct usb_function *f) | |
2898 | { | |
5920cda6 AP |
2899 | struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); |
2900 | ||
2901 | if (IS_ERR(ffs_opts)) | |
2902 | return PTR_ERR(ffs_opts); | |
5920cda6 AP |
2903 | |
2904 | return _ffs_func_bind(c, f); | |
2905 | } | |
2906 | ||
ddf8abd2 MN |
2907 | |
2908 | /* Other USB function hooks *************************************************/ | |
2909 | ||
18d6b32f RB |
2910 | static void ffs_reset_work(struct work_struct *work) |
2911 | { | |
2912 | struct ffs_data *ffs = container_of(work, | |
2913 | struct ffs_data, reset_work); | |
2914 | ffs_data_reset(ffs); | |
2915 | } | |
2916 | ||
ddf8abd2 MN |
2917 | static int ffs_func_set_alt(struct usb_function *f, |
2918 | unsigned interface, unsigned alt) | |
2919 | { | |
2920 | struct ffs_function *func = ffs_func_from_usb(f); | |
2921 | struct ffs_data *ffs = func->ffs; | |
2922 | int ret = 0, intf; | |
2923 | ||
2924 | if (alt != (unsigned)-1) { | |
2925 | intf = ffs_func_revmap_intf(func, interface); | |
2926 | if (unlikely(intf < 0)) | |
2927 | return intf; | |
2928 | } | |
2929 | ||
2930 | if (ffs->func) | |
2931 | ffs_func_eps_disable(ffs->func); | |
2932 | ||
18d6b32f RB |
2933 | if (ffs->state == FFS_DEACTIVATED) { |
2934 | ffs->state = FFS_CLOSING; | |
2935 | INIT_WORK(&ffs->reset_work, ffs_reset_work); | |
2936 | schedule_work(&ffs->reset_work); | |
2937 | return -ENODEV; | |
2938 | } | |
2939 | ||
ddf8abd2 MN |
2940 | if (ffs->state != FFS_ACTIVE) |
2941 | return -ENODEV; | |
2942 | ||
2943 | if (alt == (unsigned)-1) { | |
2944 | ffs->func = NULL; | |
2945 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); | |
2946 | return 0; | |
2947 | } | |
2948 | ||
2949 | ffs->func = func; | |
2950 | ret = ffs_func_eps_enable(func); | |
2951 | if (likely(ret >= 0)) | |
2952 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); | |
2953 | return ret; | |
2954 | } | |
2955 | ||
2956 | static void ffs_func_disable(struct usb_function *f) | |
2957 | { | |
2958 | ffs_func_set_alt(f, 0, (unsigned)-1); | |
2959 | } | |
2960 | ||
2961 | static int ffs_func_setup(struct usb_function *f, | |
2962 | const struct usb_ctrlrequest *creq) | |
2963 | { | |
2964 | struct ffs_function *func = ffs_func_from_usb(f); | |
2965 | struct ffs_data *ffs = func->ffs; | |
2966 | unsigned long flags; | |
2967 | int ret; | |
2968 | ||
2969 | ENTER(); | |
2970 | ||
aa02f172 MN |
2971 | pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); |
2972 | pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); | |
2973 | pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); | |
2974 | pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); | |
2975 | pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); | |
ddf8abd2 | 2976 | |
5ab54cf7 MN |
2977 | /* |
2978 | * Most requests directed to interface go through here | |
ddf8abd2 MN |
2979 | * (notable exceptions are set/get interface) so we need to |
2980 | * handle them. All other either handled by composite or | |
2981 | * passed to usb_configuration->setup() (if one is set). No | |
2982 | * matter, we will handle requests directed to endpoint here | |
2983 | * as well (as it's straightforward) but what to do with any | |
5ab54cf7 MN |
2984 | * other request? |
2985 | */ | |
ddf8abd2 MN |
2986 | if (ffs->state != FFS_ACTIVE) |
2987 | return -ENODEV; | |
2988 | ||
2989 | switch (creq->bRequestType & USB_RECIP_MASK) { | |
2990 | case USB_RECIP_INTERFACE: | |
2991 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); | |
2992 | if (unlikely(ret < 0)) | |
2993 | return ret; | |
2994 | break; | |
2995 | ||
2996 | case USB_RECIP_ENDPOINT: | |
2997 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); | |
2998 | if (unlikely(ret < 0)) | |
2999 | return ret; | |
1b0bf88f RB |
3000 | if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) |
3001 | ret = func->ffs->eps_addrmap[ret]; | |
ddf8abd2 MN |
3002 | break; |
3003 | ||
3004 | default: | |
3005 | return -EOPNOTSUPP; | |
3006 | } | |
3007 | ||
3008 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
3009 | ffs->ev.setup = *creq; | |
3010 | ffs->ev.setup.wIndex = cpu_to_le16(ret); | |
3011 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); | |
3012 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
3013 | ||
3014 | return 0; | |
3015 | } | |
3016 | ||
3017 | static void ffs_func_suspend(struct usb_function *f) | |
3018 | { | |
3019 | ENTER(); | |
3020 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); | |
3021 | } | |
3022 | ||
3023 | static void ffs_func_resume(struct usb_function *f) | |
3024 | { | |
3025 | ENTER(); | |
3026 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); | |
3027 | } | |
3028 | ||
3029 | ||
5ab54cf7 | 3030 | /* Endpoint and interface numbers reverse mapping ***************************/ |
ddf8abd2 MN |
3031 | |
3032 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) | |
3033 | { | |
3034 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; | |
3035 | return num ? num : -EDOM; | |
3036 | } | |
3037 | ||
3038 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) | |
3039 | { | |
3040 | short *nums = func->interfaces_nums; | |
3041 | unsigned count = func->ffs->interfaces_count; | |
3042 | ||
3043 | for (; count; --count, ++nums) { | |
3044 | if (*nums >= 0 && *nums == intf) | |
3045 | return nums - func->interfaces_nums; | |
3046 | } | |
3047 | ||
3048 | return -EDOM; | |
3049 | } | |
3050 | ||
3051 | ||
4b187fce AP |
3052 | /* Devices management *******************************************************/ |
3053 | ||
3054 | static LIST_HEAD(ffs_devices); | |
3055 | ||
da13a773 | 3056 | static struct ffs_dev *_ffs_do_find_dev(const char *name) |
4b187fce AP |
3057 | { |
3058 | struct ffs_dev *dev; | |
3059 | ||
3060 | list_for_each_entry(dev, &ffs_devices, entry) { | |
3061 | if (!dev->name || !name) | |
3062 | continue; | |
3063 | if (strcmp(dev->name, name) == 0) | |
3064 | return dev; | |
3065 | } | |
b658499f | 3066 | |
4b187fce AP |
3067 | return NULL; |
3068 | } | |
3069 | ||
3070 | /* | |
3071 | * ffs_lock must be taken by the caller of this function | |
3072 | */ | |
da13a773 | 3073 | static struct ffs_dev *_ffs_get_single_dev(void) |
4b187fce AP |
3074 | { |
3075 | struct ffs_dev *dev; | |
3076 | ||
3077 | if (list_is_singular(&ffs_devices)) { | |
3078 | dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); | |
3079 | if (dev->single) | |
3080 | return dev; | |
3081 | } | |
3082 | ||
3083 | return NULL; | |
3084 | } | |
3085 | ||
3086 | /* | |
3087 | * ffs_lock must be taken by the caller of this function | |
3088 | */ | |
da13a773 | 3089 | static struct ffs_dev *_ffs_find_dev(const char *name) |
4b187fce AP |
3090 | { |
3091 | struct ffs_dev *dev; | |
3092 | ||
da13a773 | 3093 | dev = _ffs_get_single_dev(); |
4b187fce AP |
3094 | if (dev) |
3095 | return dev; | |
3096 | ||
da13a773 | 3097 | return _ffs_do_find_dev(name); |
4b187fce AP |
3098 | } |
3099 | ||
b658499f AP |
3100 | /* Configfs support *********************************************************/ |
3101 | ||
3102 | static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) | |
3103 | { | |
3104 | return container_of(to_config_group(item), struct f_fs_opts, | |
3105 | func_inst.group); | |
3106 | } | |
3107 | ||
3108 | static void ffs_attr_release(struct config_item *item) | |
3109 | { | |
3110 | struct f_fs_opts *opts = to_ffs_opts(item); | |
3111 | ||
3112 | usb_put_function_instance(&opts->func_inst); | |
3113 | } | |
3114 | ||
3115 | static struct configfs_item_operations ffs_item_ops = { | |
3116 | .release = ffs_attr_release, | |
3117 | }; | |
3118 | ||
3119 | static struct config_item_type ffs_func_type = { | |
3120 | .ct_item_ops = &ffs_item_ops, | |
3121 | .ct_owner = THIS_MODULE, | |
3122 | }; | |
3123 | ||
3124 | ||
5920cda6 AP |
3125 | /* Function registration interface ******************************************/ |
3126 | ||
5920cda6 AP |
3127 | static void ffs_free_inst(struct usb_function_instance *f) |
3128 | { | |
3129 | struct f_fs_opts *opts; | |
3130 | ||
3131 | opts = to_f_fs_opts(f); | |
3132 | ffs_dev_lock(); | |
da13a773 | 3133 | _ffs_free_dev(opts->dev); |
5920cda6 AP |
3134 | ffs_dev_unlock(); |
3135 | kfree(opts); | |
3136 | } | |
3137 | ||
b658499f AP |
3138 | #define MAX_INST_NAME_LEN 40 |
3139 | ||
3140 | static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) | |
3141 | { | |
3142 | struct f_fs_opts *opts; | |
3143 | char *ptr; | |
3144 | const char *tmp; | |
3145 | int name_len, ret; | |
3146 | ||
3147 | name_len = strlen(name) + 1; | |
3148 | if (name_len > MAX_INST_NAME_LEN) | |
3149 | return -ENAMETOOLONG; | |
3150 | ||
3151 | ptr = kstrndup(name, name_len, GFP_KERNEL); | |
3152 | if (!ptr) | |
3153 | return -ENOMEM; | |
3154 | ||
3155 | opts = to_f_fs_opts(fi); | |
3156 | tmp = NULL; | |
3157 | ||
3158 | ffs_dev_lock(); | |
3159 | ||
3160 | tmp = opts->dev->name_allocated ? opts->dev->name : NULL; | |
3161 | ret = _ffs_name_dev(opts->dev, ptr); | |
3162 | if (ret) { | |
3163 | kfree(ptr); | |
3164 | ffs_dev_unlock(); | |
3165 | return ret; | |
3166 | } | |
3167 | opts->dev->name_allocated = true; | |
3168 | ||
3169 | ffs_dev_unlock(); | |
3170 | ||
3171 | kfree(tmp); | |
3172 | ||
3173 | return 0; | |
3174 | } | |
3175 | ||
5920cda6 AP |
3176 | static struct usb_function_instance *ffs_alloc_inst(void) |
3177 | { | |
3178 | struct f_fs_opts *opts; | |
3179 | struct ffs_dev *dev; | |
3180 | ||
3181 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3182 | if (!opts) | |
3183 | return ERR_PTR(-ENOMEM); | |
3184 | ||
b658499f | 3185 | opts->func_inst.set_inst_name = ffs_set_inst_name; |
5920cda6 AP |
3186 | opts->func_inst.free_func_inst = ffs_free_inst; |
3187 | ffs_dev_lock(); | |
da13a773 | 3188 | dev = _ffs_alloc_dev(); |
5920cda6 AP |
3189 | ffs_dev_unlock(); |
3190 | if (IS_ERR(dev)) { | |
3191 | kfree(opts); | |
3192 | return ERR_CAST(dev); | |
3193 | } | |
3194 | opts->dev = dev; | |
b658499f | 3195 | dev->opts = opts; |
5920cda6 | 3196 | |
b658499f AP |
3197 | config_group_init_type_name(&opts->func_inst.group, "", |
3198 | &ffs_func_type); | |
5920cda6 AP |
3199 | return &opts->func_inst; |
3200 | } | |
3201 | ||
3202 | static void ffs_free(struct usb_function *f) | |
3203 | { | |
3204 | kfree(ffs_func_from_usb(f)); | |
3205 | } | |
3206 | ||
3207 | static void ffs_func_unbind(struct usb_configuration *c, | |
3208 | struct usb_function *f) | |
3209 | { | |
3210 | struct ffs_function *func = ffs_func_from_usb(f); | |
3211 | struct ffs_data *ffs = func->ffs; | |
3212 | struct f_fs_opts *opts = | |
3213 | container_of(f->fi, struct f_fs_opts, func_inst); | |
3214 | struct ffs_ep *ep = func->eps; | |
3215 | unsigned count = ffs->eps_count; | |
3216 | unsigned long flags; | |
3217 | ||
3218 | ENTER(); | |
3219 | if (ffs->func == func) { | |
3220 | ffs_func_eps_disable(func); | |
3221 | ffs->func = NULL; | |
3222 | } | |
3223 | ||
3224 | if (!--opts->refcnt) | |
3225 | functionfs_unbind(ffs); | |
3226 | ||
3227 | /* cleanup after autoconfig */ | |
3228 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
3229 | do { | |
3230 | if (ep->ep && ep->req) | |
3231 | usb_ep_free_request(ep->ep, ep->req); | |
3232 | ep->req = NULL; | |
3233 | ++ep; | |
3234 | } while (--count); | |
3235 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
3236 | kfree(func->eps); | |
3237 | func->eps = NULL; | |
3238 | /* | |
3239 | * eps, descriptors and interfaces_nums are allocated in the | |
3240 | * same chunk so only one free is required. | |
3241 | */ | |
3242 | func->function.fs_descriptors = NULL; | |
3243 | func->function.hs_descriptors = NULL; | |
8d4e897b | 3244 | func->function.ss_descriptors = NULL; |
5920cda6 AP |
3245 | func->interfaces_nums = NULL; |
3246 | ||
3247 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); | |
3248 | } | |
3249 | ||
3250 | static struct usb_function *ffs_alloc(struct usb_function_instance *fi) | |
3251 | { | |
3252 | struct ffs_function *func; | |
3253 | ||
3254 | ENTER(); | |
3255 | ||
3256 | func = kzalloc(sizeof(*func), GFP_KERNEL); | |
3257 | if (unlikely(!func)) | |
3258 | return ERR_PTR(-ENOMEM); | |
3259 | ||
3260 | func->function.name = "Function FS Gadget"; | |
3261 | ||
3262 | func->function.bind = ffs_func_bind; | |
3263 | func->function.unbind = ffs_func_unbind; | |
3264 | func->function.set_alt = ffs_func_set_alt; | |
3265 | func->function.disable = ffs_func_disable; | |
3266 | func->function.setup = ffs_func_setup; | |
3267 | func->function.suspend = ffs_func_suspend; | |
3268 | func->function.resume = ffs_func_resume; | |
3269 | func->function.free_func = ffs_free; | |
3270 | ||
3271 | return &func->function; | |
3272 | } | |
3273 | ||
4b187fce AP |
3274 | /* |
3275 | * ffs_lock must be taken by the caller of this function | |
3276 | */ | |
da13a773 | 3277 | static struct ffs_dev *_ffs_alloc_dev(void) |
4b187fce AP |
3278 | { |
3279 | struct ffs_dev *dev; | |
3280 | int ret; | |
3281 | ||
da13a773 | 3282 | if (_ffs_get_single_dev()) |
4b187fce AP |
3283 | return ERR_PTR(-EBUSY); |
3284 | ||
3285 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
3286 | if (!dev) | |
3287 | return ERR_PTR(-ENOMEM); | |
3288 | ||
3289 | if (list_empty(&ffs_devices)) { | |
3290 | ret = functionfs_init(); | |
3291 | if (ret) { | |
3292 | kfree(dev); | |
3293 | return ERR_PTR(ret); | |
3294 | } | |
3295 | } | |
3296 | ||
3297 | list_add(&dev->entry, &ffs_devices); | |
3298 | ||
3299 | return dev; | |
3300 | } | |
3301 | ||
3302 | /* | |
3303 | * ffs_lock must be taken by the caller of this function | |
3304 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3305 | */ | |
3306 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3307 | { | |
3308 | struct ffs_dev *existing; | |
3309 | ||
da13a773 | 3310 | existing = _ffs_do_find_dev(name); |
4b187fce AP |
3311 | if (existing) |
3312 | return -EBUSY; | |
ab13cb0c | 3313 | |
4b187fce AP |
3314 | dev->name = name; |
3315 | ||
3316 | return 0; | |
3317 | } | |
3318 | ||
3319 | /* | |
3320 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3321 | */ | |
3322 | int ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3323 | { | |
3324 | int ret; | |
3325 | ||
3326 | ffs_dev_lock(); | |
3327 | ret = _ffs_name_dev(dev, name); | |
3328 | ffs_dev_unlock(); | |
3329 | ||
3330 | return ret; | |
3331 | } | |
0700faaf | 3332 | EXPORT_SYMBOL_GPL(ffs_name_dev); |
4b187fce AP |
3333 | |
3334 | int ffs_single_dev(struct ffs_dev *dev) | |
3335 | { | |
3336 | int ret; | |
3337 | ||
3338 | ret = 0; | |
3339 | ffs_dev_lock(); | |
3340 | ||
3341 | if (!list_is_singular(&ffs_devices)) | |
3342 | ret = -EBUSY; | |
3343 | else | |
3344 | dev->single = true; | |
3345 | ||
3346 | ffs_dev_unlock(); | |
3347 | return ret; | |
3348 | } | |
0700faaf | 3349 | EXPORT_SYMBOL_GPL(ffs_single_dev); |
4b187fce AP |
3350 | |
3351 | /* | |
3352 | * ffs_lock must be taken by the caller of this function | |
3353 | */ | |
da13a773 | 3354 | static void _ffs_free_dev(struct ffs_dev *dev) |
4b187fce AP |
3355 | { |
3356 | list_del(&dev->entry); | |
b658499f AP |
3357 | if (dev->name_allocated) |
3358 | kfree(dev->name); | |
4b187fce AP |
3359 | kfree(dev); |
3360 | if (list_empty(&ffs_devices)) | |
3361 | functionfs_cleanup(); | |
3362 | } | |
3363 | ||
3364 | static void *ffs_acquire_dev(const char *dev_name) | |
3365 | { | |
3366 | struct ffs_dev *ffs_dev; | |
3367 | ||
3368 | ENTER(); | |
3369 | ffs_dev_lock(); | |
3370 | ||
da13a773 | 3371 | ffs_dev = _ffs_find_dev(dev_name); |
4b187fce | 3372 | if (!ffs_dev) |
d668b4f3 | 3373 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3374 | else if (ffs_dev->mounted) |
3375 | ffs_dev = ERR_PTR(-EBUSY); | |
5920cda6 AP |
3376 | else if (ffs_dev->ffs_acquire_dev_callback && |
3377 | ffs_dev->ffs_acquire_dev_callback(ffs_dev)) | |
d668b4f3 | 3378 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3379 | else |
3380 | ffs_dev->mounted = true; | |
3381 | ||
3382 | ffs_dev_unlock(); | |
3383 | return ffs_dev; | |
3384 | } | |
3385 | ||
3386 | static void ffs_release_dev(struct ffs_data *ffs_data) | |
3387 | { | |
3388 | struct ffs_dev *ffs_dev; | |
3389 | ||
3390 | ENTER(); | |
3391 | ffs_dev_lock(); | |
3392 | ||
3393 | ffs_dev = ffs_data->private_data; | |
ea365922 | 3394 | if (ffs_dev) { |
4b187fce | 3395 | ffs_dev->mounted = false; |
ea365922 AP |
3396 | |
3397 | if (ffs_dev->ffs_release_dev_callback) | |
3398 | ffs_dev->ffs_release_dev_callback(ffs_dev); | |
3399 | } | |
4b187fce AP |
3400 | |
3401 | ffs_dev_unlock(); | |
3402 | } | |
3403 | ||
3404 | static int ffs_ready(struct ffs_data *ffs) | |
3405 | { | |
3406 | struct ffs_dev *ffs_obj; | |
3407 | int ret = 0; | |
3408 | ||
3409 | ENTER(); | |
3410 | ffs_dev_lock(); | |
3411 | ||
3412 | ffs_obj = ffs->private_data; | |
3413 | if (!ffs_obj) { | |
3414 | ret = -EINVAL; | |
3415 | goto done; | |
3416 | } | |
3417 | if (WARN_ON(ffs_obj->desc_ready)) { | |
3418 | ret = -EBUSY; | |
3419 | goto done; | |
3420 | } | |
3421 | ||
3422 | ffs_obj->desc_ready = true; | |
3423 | ffs_obj->ffs_data = ffs; | |
3424 | ||
3425 | if (ffs_obj->ffs_ready_callback) | |
3426 | ret = ffs_obj->ffs_ready_callback(ffs); | |
3427 | ||
3428 | done: | |
3429 | ffs_dev_unlock(); | |
3430 | return ret; | |
3431 | } | |
3432 | ||
3433 | static void ffs_closed(struct ffs_data *ffs) | |
3434 | { | |
3435 | struct ffs_dev *ffs_obj; | |
3436 | ||
3437 | ENTER(); | |
3438 | ffs_dev_lock(); | |
3439 | ||
3440 | ffs_obj = ffs->private_data; | |
3441 | if (!ffs_obj) | |
3442 | goto done; | |
3443 | ||
3444 | ffs_obj->desc_ready = false; | |
3445 | ||
3446 | if (ffs_obj->ffs_closed_callback) | |
3447 | ffs_obj->ffs_closed_callback(ffs); | |
b658499f AP |
3448 | |
3449 | if (!ffs_obj->opts || ffs_obj->opts->no_configfs | |
3450 | || !ffs_obj->opts->func_inst.group.cg_item.ci_parent) | |
3451 | goto done; | |
3452 | ||
3453 | unregister_gadget_item(ffs_obj->opts-> | |
3454 | func_inst.group.cg_item.ci_parent->ci_parent); | |
4b187fce AP |
3455 | done: |
3456 | ffs_dev_unlock(); | |
3457 | } | |
3458 | ||
ddf8abd2 MN |
3459 | /* Misc helper functions ****************************************************/ |
3460 | ||
3461 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
3462 | { | |
3463 | return nonblock | |
3464 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN | |
3465 | : mutex_lock_interruptible(mutex); | |
3466 | } | |
3467 | ||
260ef311 | 3468 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
3469 | { |
3470 | char *data; | |
3471 | ||
3472 | if (unlikely(!len)) | |
3473 | return NULL; | |
3474 | ||
3475 | data = kmalloc(len, GFP_KERNEL); | |
3476 | if (unlikely(!data)) | |
3477 | return ERR_PTR(-ENOMEM); | |
3478 | ||
3479 | if (unlikely(__copy_from_user(data, buf, len))) { | |
3480 | kfree(data); | |
3481 | return ERR_PTR(-EFAULT); | |
3482 | } | |
3483 | ||
aa02f172 | 3484 | pr_vdebug("Buffer from user space:\n"); |
ddf8abd2 MN |
3485 | ffs_dump_mem("", data, len); |
3486 | ||
3487 | return data; | |
3488 | } | |
5920cda6 | 3489 | |
5920cda6 AP |
3490 | DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc); |
3491 | MODULE_LICENSE("GPL"); | |
3492 | MODULE_AUTHOR("Michal Nazarewicz"); |