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> |
e2e40f2c | 26 | #include <linux/uio.h> |
ddf8abd2 | 27 | #include <asm/unaligned.h> |
ddf8abd2 MN |
28 | |
29 | #include <linux/usb/composite.h> | |
30 | #include <linux/usb/functionfs.h> | |
31 | ||
2e4c7553 RB |
32 | #include <linux/aio.h> |
33 | #include <linux/mmu_context.h> | |
23de91e9 | 34 | #include <linux/poll.h> |
5e33f6fd | 35 | #include <linux/eventfd.h> |
23de91e9 | 36 | |
e72c39c0 | 37 | #include "u_fs.h" |
74d48466 | 38 | #include "u_f.h" |
f0175ab5 | 39 | #include "u_os_desc.h" |
b658499f | 40 | #include "configfs.h" |
ddf8abd2 MN |
41 | |
42 | #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ | |
43 | ||
ddf8abd2 MN |
44 | /* Reference counter handling */ |
45 | static void ffs_data_get(struct ffs_data *ffs); | |
46 | static void ffs_data_put(struct ffs_data *ffs); | |
47 | /* Creates new ffs_data object. */ | |
48 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); | |
49 | ||
50 | /* Opened counter handling. */ | |
51 | static void ffs_data_opened(struct ffs_data *ffs); | |
52 | static void ffs_data_closed(struct ffs_data *ffs); | |
53 | ||
5ab54cf7 | 54 | /* Called with ffs->mutex held; take over ownership of data. */ |
ddf8abd2 MN |
55 | static int __must_check |
56 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); | |
57 | static int __must_check | |
58 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); | |
59 | ||
60 | ||
61 | /* The function structure ***************************************************/ | |
62 | ||
63 | struct ffs_ep; | |
64 | ||
65 | struct ffs_function { | |
66 | struct usb_configuration *conf; | |
67 | struct usb_gadget *gadget; | |
68 | struct ffs_data *ffs; | |
69 | ||
70 | struct ffs_ep *eps; | |
71 | u8 eps_revmap[16]; | |
72 | short *interfaces_nums; | |
73 | ||
74 | struct usb_function function; | |
75 | }; | |
76 | ||
77 | ||
78 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) | |
79 | { | |
80 | return container_of(f, struct ffs_function, function); | |
81 | } | |
82 | ||
ddf8abd2 | 83 | |
a7ecf054 MN |
84 | static inline enum ffs_setup_state |
85 | ffs_setup_state_clear_cancelled(struct ffs_data *ffs) | |
86 | { | |
87 | return (enum ffs_setup_state) | |
88 | cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); | |
89 | } | |
90 | ||
91 | ||
ddf8abd2 MN |
92 | static void ffs_func_eps_disable(struct ffs_function *func); |
93 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); | |
94 | ||
ddf8abd2 MN |
95 | static int ffs_func_bind(struct usb_configuration *, |
96 | struct usb_function *); | |
ddf8abd2 MN |
97 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); |
98 | static void ffs_func_disable(struct usb_function *); | |
99 | static int ffs_func_setup(struct usb_function *, | |
100 | const struct usb_ctrlrequest *); | |
101 | static void ffs_func_suspend(struct usb_function *); | |
102 | static void ffs_func_resume(struct usb_function *); | |
103 | ||
104 | ||
105 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); | |
106 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); | |
107 | ||
108 | ||
ddf8abd2 MN |
109 | /* The endpoints structures *************************************************/ |
110 | ||
111 | struct ffs_ep { | |
112 | struct usb_ep *ep; /* P: ffs->eps_lock */ | |
113 | struct usb_request *req; /* P: epfile->mutex */ | |
114 | ||
8d4e897b MG |
115 | /* [0]: full speed, [1]: high speed, [2]: super speed */ |
116 | struct usb_endpoint_descriptor *descs[3]; | |
ddf8abd2 MN |
117 | |
118 | u8 num; | |
119 | ||
120 | int status; /* P: epfile->mutex */ | |
121 | }; | |
122 | ||
123 | struct ffs_epfile { | |
124 | /* Protects ep->ep and ep->req. */ | |
125 | struct mutex mutex; | |
126 | wait_queue_head_t wait; | |
127 | ||
128 | struct ffs_data *ffs; | |
129 | struct ffs_ep *ep; /* P: ffs->eps_lock */ | |
130 | ||
131 | struct dentry *dentry; | |
132 | ||
133 | char name[5]; | |
134 | ||
135 | unsigned char in; /* P: ffs->eps_lock */ | |
136 | unsigned char isoc; /* P: ffs->eps_lock */ | |
137 | ||
138 | unsigned char _pad; | |
139 | }; | |
140 | ||
2e4c7553 RB |
141 | /* ffs_io_data structure ***************************************************/ |
142 | ||
143 | struct ffs_io_data { | |
144 | bool aio; | |
145 | bool read; | |
146 | ||
147 | struct kiocb *kiocb; | |
c993c39b AV |
148 | struct iov_iter data; |
149 | const void *to_free; | |
150 | char *buf; | |
2e4c7553 RB |
151 | |
152 | struct mm_struct *mm; | |
153 | struct work_struct work; | |
154 | ||
155 | struct usb_ep *ep; | |
156 | struct usb_request *req; | |
5e33f6fd RB |
157 | |
158 | struct ffs_data *ffs; | |
2e4c7553 RB |
159 | }; |
160 | ||
6d5c1c77 RB |
161 | struct ffs_desc_helper { |
162 | struct ffs_data *ffs; | |
163 | unsigned interfaces_count; | |
164 | unsigned eps_count; | |
165 | }; | |
166 | ||
ddf8abd2 MN |
167 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
168 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); | |
169 | ||
1bb27cac | 170 | static struct dentry * |
ddf8abd2 | 171 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, |
1bb27cac | 172 | const struct file_operations *fops); |
ddf8abd2 | 173 | |
4b187fce AP |
174 | /* Devices management *******************************************************/ |
175 | ||
176 | DEFINE_MUTEX(ffs_lock); | |
0700faaf | 177 | EXPORT_SYMBOL_GPL(ffs_lock); |
4b187fce | 178 | |
da13a773 AP |
179 | static struct ffs_dev *_ffs_find_dev(const char *name); |
180 | static struct ffs_dev *_ffs_alloc_dev(void); | |
b658499f | 181 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name); |
da13a773 | 182 | static void _ffs_free_dev(struct ffs_dev *dev); |
4b187fce AP |
183 | static void *ffs_acquire_dev(const char *dev_name); |
184 | static void ffs_release_dev(struct ffs_data *ffs_data); | |
185 | static int ffs_ready(struct ffs_data *ffs); | |
186 | static void ffs_closed(struct ffs_data *ffs); | |
ddf8abd2 MN |
187 | |
188 | /* Misc helper functions ****************************************************/ | |
189 | ||
190 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
191 | __attribute__((warn_unused_result, nonnull)); | |
260ef311 | 192 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
193 | __attribute__((warn_unused_result, nonnull)); |
194 | ||
195 | ||
196 | /* Control file aka ep0 *****************************************************/ | |
197 | ||
198 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
199 | { | |
200 | struct ffs_data *ffs = req->context; | |
201 | ||
202 | complete_all(&ffs->ep0req_completion); | |
203 | } | |
204 | ||
ddf8abd2 MN |
205 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
206 | { | |
207 | struct usb_request *req = ffs->ep0req; | |
208 | int ret; | |
209 | ||
210 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); | |
211 | ||
212 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
213 | ||
214 | req->buf = data; | |
215 | req->length = len; | |
216 | ||
ce1fd358 MS |
217 | /* |
218 | * UDC layer requires to provide a buffer even for ZLP, but should | |
219 | * not use it at all. Let's provide some poisoned pointer to catch | |
220 | * possible bug in the driver. | |
221 | */ | |
222 | if (req->buf == NULL) | |
223 | req->buf = (void *)0xDEADBABE; | |
224 | ||
16735d02 | 225 | reinit_completion(&ffs->ep0req_completion); |
ddf8abd2 MN |
226 | |
227 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); | |
228 | if (unlikely(ret < 0)) | |
229 | return ret; | |
230 | ||
231 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); | |
232 | if (unlikely(ret)) { | |
233 | usb_ep_dequeue(ffs->gadget->ep0, req); | |
234 | return -EINTR; | |
235 | } | |
236 | ||
237 | ffs->setup_state = FFS_NO_SETUP; | |
0a7b1f8a | 238 | return req->status ? req->status : req->actual; |
ddf8abd2 MN |
239 | } |
240 | ||
241 | static int __ffs_ep0_stall(struct ffs_data *ffs) | |
242 | { | |
243 | if (ffs->ev.can_stall) { | |
aa02f172 | 244 | pr_vdebug("ep0 stall\n"); |
ddf8abd2 MN |
245 | usb_ep_set_halt(ffs->gadget->ep0); |
246 | ffs->setup_state = FFS_NO_SETUP; | |
247 | return -EL2HLT; | |
248 | } else { | |
aa02f172 | 249 | pr_debug("bogus ep0 stall!\n"); |
ddf8abd2 MN |
250 | return -ESRCH; |
251 | } | |
252 | } | |
253 | ||
ddf8abd2 MN |
254 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
255 | size_t len, loff_t *ptr) | |
256 | { | |
257 | struct ffs_data *ffs = file->private_data; | |
258 | ssize_t ret; | |
259 | char *data; | |
260 | ||
261 | ENTER(); | |
262 | ||
263 | /* Fast check if setup was canceled */ | |
a7ecf054 | 264 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
265 | return -EIDRM; |
266 | ||
267 | /* Acquire mutex */ | |
268 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
269 | if (unlikely(ret < 0)) | |
270 | return ret; | |
271 | ||
ddf8abd2 MN |
272 | /* Check state */ |
273 | switch (ffs->state) { | |
274 | case FFS_READ_DESCRIPTORS: | |
275 | case FFS_READ_STRINGS: | |
276 | /* Copy data */ | |
277 | if (unlikely(len < 16)) { | |
278 | ret = -EINVAL; | |
279 | break; | |
280 | } | |
281 | ||
282 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 283 | if (IS_ERR(data)) { |
ddf8abd2 MN |
284 | ret = PTR_ERR(data); |
285 | break; | |
286 | } | |
287 | ||
288 | /* Handle data */ | |
289 | if (ffs->state == FFS_READ_DESCRIPTORS) { | |
aa02f172 | 290 | pr_info("read descriptors\n"); |
ddf8abd2 MN |
291 | ret = __ffs_data_got_descs(ffs, data, len); |
292 | if (unlikely(ret < 0)) | |
293 | break; | |
294 | ||
295 | ffs->state = FFS_READ_STRINGS; | |
296 | ret = len; | |
297 | } else { | |
aa02f172 | 298 | pr_info("read strings\n"); |
ddf8abd2 MN |
299 | ret = __ffs_data_got_strings(ffs, data, len); |
300 | if (unlikely(ret < 0)) | |
301 | break; | |
302 | ||
303 | ret = ffs_epfiles_create(ffs); | |
304 | if (unlikely(ret)) { | |
305 | ffs->state = FFS_CLOSING; | |
306 | break; | |
307 | } | |
308 | ||
309 | ffs->state = FFS_ACTIVE; | |
310 | mutex_unlock(&ffs->mutex); | |
311 | ||
4b187fce | 312 | ret = ffs_ready(ffs); |
ddf8abd2 MN |
313 | if (unlikely(ret < 0)) { |
314 | ffs->state = FFS_CLOSING; | |
315 | return ret; | |
316 | } | |
317 | ||
ddf8abd2 MN |
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 | ||
7fe9a937 | 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); | |
7fe9a937 | 516 | if (likely(ret > 0) && unlikely(copy_to_user(buf, data, len))) |
ddf8abd2 MN |
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; | |
38740a5b | 649 | bool kiocb_has_eventfd = io_data->kiocb->ki_flags & IOCB_EVENTFD; |
2e4c7553 RB |
650 | |
651 | if (io_data->read && ret > 0) { | |
2e4c7553 | 652 | use_mm(io_data->mm); |
c993c39b AV |
653 | ret = copy_to_iter(io_data->buf, ret, &io_data->data); |
654 | if (iov_iter_count(&io_data->data)) | |
655 | ret = -EFAULT; | |
2e4c7553 RB |
656 | unuse_mm(io_data->mm); |
657 | } | |
658 | ||
04b2fa9f | 659 | io_data->kiocb->ki_complete(io_data->kiocb, ret, ret); |
2e4c7553 | 660 | |
38740a5b | 661 | if (io_data->ffs->ffs_eventfd && !kiocb_has_eventfd) |
5e33f6fd RB |
662 | eventfd_signal(io_data->ffs->ffs_eventfd, 1); |
663 | ||
2e4c7553 RB |
664 | usb_ep_free_request(io_data->ep, io_data->req); |
665 | ||
2e4c7553 | 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; | |
ae76e134 | 686 | struct usb_request *req; |
ddf8abd2 MN |
687 | struct ffs_ep *ep; |
688 | char *data = NULL; | |
c0d31b3c | 689 | ssize_t ret, data_len = -EINVAL; |
ddf8abd2 MN |
690 | int halt; |
691 | ||
7fa68034 | 692 | /* Are we still active? */ |
b3591f67 MN |
693 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) |
694 | return -ENODEV; | |
ddf8abd2 | 695 | |
7fa68034 MN |
696 | /* Wait for endpoint to be enabled */ |
697 | ep = epfile->ep; | |
698 | if (!ep) { | |
b3591f67 MN |
699 | if (file->f_flags & O_NONBLOCK) |
700 | return -EAGAIN; | |
ddf8abd2 | 701 | |
7fa68034 | 702 | ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep)); |
b3591f67 MN |
703 | if (ret) |
704 | return -EINTR; | |
7fa68034 | 705 | } |
ddf8abd2 | 706 | |
7fa68034 | 707 | /* Do we halt? */ |
2e4c7553 | 708 | halt = (!io_data->read == !epfile->in); |
b3591f67 MN |
709 | if (halt && epfile->isoc) |
710 | return -EINVAL; | |
ddf8abd2 | 711 | |
7fa68034 MN |
712 | /* Allocate & copy */ |
713 | if (!halt) { | |
f0f42204 AP |
714 | /* |
715 | * if we _do_ wait above, the epfile->ffs->gadget might be NULL | |
ae76e134 MN |
716 | * before the waiting completes, so do not assign to 'gadget' |
717 | * earlier | |
f0f42204 AP |
718 | */ |
719 | struct usb_gadget *gadget = epfile->ffs->gadget; | |
c993c39b | 720 | size_t copied; |
f0f42204 | 721 | |
97839ca4 CB |
722 | spin_lock_irq(&epfile->ffs->eps_lock); |
723 | /* In the meantime, endpoint got disabled or changed. */ | |
724 | if (epfile->ep != ep) { | |
725 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
726 | return -ESHUTDOWN; | |
727 | } | |
c993c39b | 728 | data_len = iov_iter_count(&io_data->data); |
219580e6 MN |
729 | /* |
730 | * Controller may require buffer size to be aligned to | |
731 | * maxpacketsize of an out endpoint. | |
732 | */ | |
c993c39b AV |
733 | if (io_data->read) |
734 | data_len = usb_ep_align_maybe(gadget, ep->ep, data_len); | |
97839ca4 | 735 | spin_unlock_irq(&epfile->ffs->eps_lock); |
219580e6 MN |
736 | |
737 | data = kmalloc(data_len, GFP_KERNEL); | |
7fa68034 MN |
738 | if (unlikely(!data)) |
739 | return -ENOMEM; | |
c993c39b AV |
740 | if (!io_data->read) { |
741 | copied = copy_from_iter(data, data_len, &io_data->data); | |
742 | if (copied != data_len) { | |
2e4c7553 RB |
743 | ret = -EFAULT; |
744 | goto error; | |
745 | } | |
7fa68034 MN |
746 | } |
747 | } | |
ddf8abd2 | 748 | |
7fa68034 MN |
749 | /* We will be using request */ |
750 | ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); | |
751 | if (unlikely(ret)) | |
752 | goto error; | |
ddf8abd2 | 753 | |
7fa68034 | 754 | spin_lock_irq(&epfile->ffs->eps_lock); |
ddf8abd2 | 755 | |
7fa68034 MN |
756 | if (epfile->ep != ep) { |
757 | /* In the meantime, endpoint got disabled or changed. */ | |
758 | ret = -ESHUTDOWN; | |
7fa68034 MN |
759 | } else if (halt) { |
760 | /* Halt */ | |
ddf8abd2 MN |
761 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) |
762 | usb_ep_set_halt(ep->ep); | |
ddf8abd2 | 763 | ret = -EBADMSG; |
ae76e134 | 764 | } else if (unlikely(data_len == -EINVAL)) { |
c0d31b3c DC |
765 | /* |
766 | * Sanity Check: even though data_len can't be used | |
767 | * uninitialized at the time I write this comment, some | |
768 | * compilers complain about this situation. | |
769 | * In order to keep the code clean from warnings, data_len is | |
770 | * being initialized to -EINVAL during its declaration, which | |
771 | * means we can't rely on compiler anymore to warn no future | |
772 | * changes won't result in data_len being used uninitialized. | |
773 | * For such reason, we're adding this redundant sanity check | |
774 | * here. | |
775 | */ | |
ae76e134 MN |
776 | WARN(1, "%s: data_len == -EINVAL\n", __func__); |
777 | ret = -EINVAL; | |
778 | } else if (!io_data->aio) { | |
779 | DECLARE_COMPLETION_ONSTACK(done); | |
ef150884 | 780 | bool interrupted = false; |
ddf8abd2 | 781 | |
ae76e134 MN |
782 | req = ep->req; |
783 | req->buf = data; | |
784 | req->length = data_len; | |
ddf8abd2 | 785 | |
ae76e134 MN |
786 | req->context = &done; |
787 | req->complete = ffs_epfile_io_complete; | |
2e4c7553 | 788 | |
ae76e134 MN |
789 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); |
790 | if (unlikely(ret < 0)) | |
791 | goto error_lock; | |
2e4c7553 | 792 | |
ae76e134 | 793 | spin_unlock_irq(&epfile->ffs->eps_lock); |
2e4c7553 | 794 | |
ae76e134 | 795 | if (unlikely(wait_for_completion_interruptible(&done))) { |
ef150884 DC |
796 | /* |
797 | * To avoid race condition with ffs_epfile_io_complete, | |
798 | * dequeue the request first then check | |
799 | * status. usb_ep_dequeue API should guarantee no race | |
800 | * condition with req->complete callback. | |
801 | */ | |
ae76e134 | 802 | usb_ep_dequeue(ep->ep, req); |
ef150884 | 803 | interrupted = ep->status < 0; |
ae76e134 | 804 | } |
2e4c7553 | 805 | |
ae76e134 MN |
806 | /* |
807 | * XXX We may end up silently droping data here. Since data_len | |
808 | * (i.e. req->length) may be bigger than len (after being | |
809 | * rounded up to maxpacketsize), we may end up with more data | |
810 | * then user space has space for. | |
811 | */ | |
ef150884 | 812 | ret = interrupted ? -EINTR : ep->status; |
ae76e134 MN |
813 | if (io_data->read && ret > 0) { |
814 | ret = copy_to_iter(data, ret, &io_data->data); | |
815 | if (!ret) | |
816 | ret = -EFAULT; | |
817 | } | |
818 | goto error_mutex; | |
819 | } else if (!(req = usb_ep_alloc_request(ep->ep, GFP_KERNEL))) { | |
820 | ret = -ENOMEM; | |
821 | } else { | |
822 | req->buf = data; | |
823 | req->length = data_len; | |
2e4c7553 | 824 | |
ae76e134 MN |
825 | io_data->buf = data; |
826 | io_data->ep = ep->ep; | |
827 | io_data->req = req; | |
828 | io_data->ffs = epfile->ffs; | |
2e4c7553 | 829 | |
ae76e134 MN |
830 | req->context = io_data; |
831 | req->complete = ffs_epfile_async_io_complete; | |
2e4c7553 | 832 | |
ae76e134 MN |
833 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); |
834 | if (unlikely(ret)) { | |
835 | usb_ep_free_request(ep->ep, req); | |
836 | goto error_lock; | |
ddf8abd2 | 837 | } |
ddf8abd2 | 838 | |
ae76e134 MN |
839 | ret = -EIOCBQUEUED; |
840 | /* | |
841 | * Do not kfree the buffer in this function. It will be freed | |
842 | * by ffs_user_copy_worker. | |
843 | */ | |
844 | data = NULL; | |
845 | } | |
48968f8d RB |
846 | |
847 | error_lock: | |
848 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
ae76e134 | 849 | error_mutex: |
48968f8d | 850 | mutex_unlock(&epfile->mutex); |
ddf8abd2 MN |
851 | error: |
852 | kfree(data); | |
853 | return ret; | |
854 | } | |
855 | ||
ddf8abd2 MN |
856 | static int |
857 | ffs_epfile_open(struct inode *inode, struct file *file) | |
858 | { | |
859 | struct ffs_epfile *epfile = inode->i_private; | |
860 | ||
861 | ENTER(); | |
862 | ||
863 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
864 | return -ENODEV; | |
865 | ||
866 | file->private_data = epfile; | |
867 | ffs_data_opened(epfile->ffs); | |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
2e4c7553 RB |
872 | static int ffs_aio_cancel(struct kiocb *kiocb) |
873 | { | |
874 | struct ffs_io_data *io_data = kiocb->private; | |
875 | struct ffs_epfile *epfile = kiocb->ki_filp->private_data; | |
876 | int value; | |
877 | ||
878 | ENTER(); | |
879 | ||
880 | spin_lock_irq(&epfile->ffs->eps_lock); | |
881 | ||
882 | if (likely(io_data && io_data->ep && io_data->req)) | |
883 | value = usb_ep_dequeue(io_data->ep, io_data->req); | |
884 | else | |
885 | value = -EINVAL; | |
886 | ||
887 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
888 | ||
889 | return value; | |
890 | } | |
891 | ||
70e60d91 | 892 | static ssize_t ffs_epfile_write_iter(struct kiocb *kiocb, struct iov_iter *from) |
2e4c7553 | 893 | { |
70e60d91 | 894 | struct ffs_io_data io_data, *p = &io_data; |
de2080d4 | 895 | ssize_t res; |
2e4c7553 RB |
896 | |
897 | ENTER(); | |
898 | ||
70e60d91 AV |
899 | if (!is_sync_kiocb(kiocb)) { |
900 | p = kmalloc(sizeof(io_data), GFP_KERNEL); | |
901 | if (unlikely(!p)) | |
902 | return -ENOMEM; | |
903 | p->aio = true; | |
904 | } else { | |
905 | p->aio = false; | |
906 | } | |
2e4c7553 | 907 | |
70e60d91 AV |
908 | p->read = false; |
909 | p->kiocb = kiocb; | |
910 | p->data = *from; | |
911 | p->mm = current->mm; | |
2e4c7553 | 912 | |
70e60d91 | 913 | kiocb->private = p; |
2e4c7553 | 914 | |
4088acf1 RMS |
915 | if (p->aio) |
916 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
2e4c7553 | 917 | |
70e60d91 AV |
918 | res = ffs_epfile_io(kiocb->ki_filp, p); |
919 | if (res == -EIOCBQUEUED) | |
920 | return res; | |
921 | if (p->aio) | |
922 | kfree(p); | |
923 | else | |
924 | *from = p->data; | |
de2080d4 | 925 | return res; |
2e4c7553 RB |
926 | } |
927 | ||
70e60d91 | 928 | static ssize_t ffs_epfile_read_iter(struct kiocb *kiocb, struct iov_iter *to) |
2e4c7553 | 929 | { |
70e60d91 | 930 | struct ffs_io_data io_data, *p = &io_data; |
de2080d4 | 931 | ssize_t res; |
2e4c7553 RB |
932 | |
933 | ENTER(); | |
934 | ||
70e60d91 AV |
935 | if (!is_sync_kiocb(kiocb)) { |
936 | p = kmalloc(sizeof(io_data), GFP_KERNEL); | |
937 | if (unlikely(!p)) | |
938 | return -ENOMEM; | |
939 | p->aio = true; | |
940 | } else { | |
941 | p->aio = false; | |
2e4c7553 RB |
942 | } |
943 | ||
70e60d91 AV |
944 | p->read = true; |
945 | p->kiocb = kiocb; | |
946 | if (p->aio) { | |
947 | p->to_free = dup_iter(&p->data, to, GFP_KERNEL); | |
948 | if (!p->to_free) { | |
949 | kfree(p); | |
950 | return -ENOMEM; | |
951 | } | |
952 | } else { | |
953 | p->data = *to; | |
954 | p->to_free = NULL; | |
955 | } | |
956 | p->mm = current->mm; | |
2e4c7553 | 957 | |
70e60d91 | 958 | kiocb->private = p; |
2e4c7553 | 959 | |
4088acf1 RMS |
960 | if (p->aio) |
961 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
2e4c7553 | 962 | |
70e60d91 AV |
963 | res = ffs_epfile_io(kiocb->ki_filp, p); |
964 | if (res == -EIOCBQUEUED) | |
965 | return res; | |
966 | ||
967 | if (p->aio) { | |
968 | kfree(p->to_free); | |
969 | kfree(p); | |
970 | } else { | |
971 | *to = p->data; | |
de2080d4 AV |
972 | } |
973 | return res; | |
2e4c7553 RB |
974 | } |
975 | ||
ddf8abd2 MN |
976 | static int |
977 | ffs_epfile_release(struct inode *inode, struct file *file) | |
978 | { | |
979 | struct ffs_epfile *epfile = inode->i_private; | |
980 | ||
981 | ENTER(); | |
982 | ||
983 | ffs_data_closed(epfile->ffs); | |
984 | ||
985 | return 0; | |
986 | } | |
987 | ||
ddf8abd2 MN |
988 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
989 | unsigned long value) | |
990 | { | |
991 | struct ffs_epfile *epfile = file->private_data; | |
992 | int ret; | |
993 | ||
994 | ENTER(); | |
995 | ||
996 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
997 | return -ENODEV; | |
998 | ||
999 | spin_lock_irq(&epfile->ffs->eps_lock); | |
1000 | if (likely(epfile->ep)) { | |
1001 | switch (code) { | |
1002 | case FUNCTIONFS_FIFO_STATUS: | |
1003 | ret = usb_ep_fifo_status(epfile->ep->ep); | |
1004 | break; | |
1005 | case FUNCTIONFS_FIFO_FLUSH: | |
1006 | usb_ep_fifo_flush(epfile->ep->ep); | |
1007 | ret = 0; | |
1008 | break; | |
1009 | case FUNCTIONFS_CLEAR_HALT: | |
1010 | ret = usb_ep_clear_halt(epfile->ep->ep); | |
1011 | break; | |
1012 | case FUNCTIONFS_ENDPOINT_REVMAP: | |
1013 | ret = epfile->ep->num; | |
1014 | break; | |
c559a353 RB |
1015 | case FUNCTIONFS_ENDPOINT_DESC: |
1016 | { | |
1017 | int desc_idx; | |
1018 | struct usb_endpoint_descriptor *desc; | |
1019 | ||
1020 | switch (epfile->ffs->gadget->speed) { | |
1021 | case USB_SPEED_SUPER: | |
1022 | desc_idx = 2; | |
1023 | break; | |
1024 | case USB_SPEED_HIGH: | |
1025 | desc_idx = 1; | |
1026 | break; | |
1027 | default: | |
1028 | desc_idx = 0; | |
1029 | } | |
1030 | desc = epfile->ep->descs[desc_idx]; | |
1031 | ||
1032 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1033 | ret = copy_to_user((void *)value, desc, sizeof(*desc)); | |
1034 | if (ret) | |
1035 | ret = -EFAULT; | |
1036 | return ret; | |
1037 | } | |
ddf8abd2 MN |
1038 | default: |
1039 | ret = -ENOTTY; | |
1040 | } | |
1041 | } else { | |
1042 | ret = -ENODEV; | |
1043 | } | |
1044 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1045 | ||
1046 | return ret; | |
1047 | } | |
1048 | ||
ddf8abd2 | 1049 | static const struct file_operations ffs_epfile_operations = { |
ddf8abd2 MN |
1050 | .llseek = no_llseek, |
1051 | ||
1052 | .open = ffs_epfile_open, | |
70e60d91 AV |
1053 | .write_iter = ffs_epfile_write_iter, |
1054 | .read_iter = ffs_epfile_read_iter, | |
ddf8abd2 MN |
1055 | .release = ffs_epfile_release, |
1056 | .unlocked_ioctl = ffs_epfile_ioctl, | |
1057 | }; | |
1058 | ||
1059 | ||
ddf8abd2 MN |
1060 | /* File system and super block operations ***********************************/ |
1061 | ||
1062 | /* | |
5ab54cf7 | 1063 | * Mounting the file system creates a controller file, used first for |
ddf8abd2 MN |
1064 | * function configuration then later for event monitoring. |
1065 | */ | |
1066 | ||
ddf8abd2 MN |
1067 | static struct inode *__must_check |
1068 | ffs_sb_make_inode(struct super_block *sb, void *data, | |
1069 | const struct file_operations *fops, | |
1070 | const struct inode_operations *iops, | |
1071 | struct ffs_file_perms *perms) | |
1072 | { | |
1073 | struct inode *inode; | |
1074 | ||
1075 | ENTER(); | |
1076 | ||
1077 | inode = new_inode(sb); | |
1078 | ||
1079 | if (likely(inode)) { | |
1080 | struct timespec current_time = CURRENT_TIME; | |
1081 | ||
12ba8d1e | 1082 | inode->i_ino = get_next_ino(); |
ddf8abd2 MN |
1083 | inode->i_mode = perms->mode; |
1084 | inode->i_uid = perms->uid; | |
1085 | inode->i_gid = perms->gid; | |
1086 | inode->i_atime = current_time; | |
1087 | inode->i_mtime = current_time; | |
1088 | inode->i_ctime = current_time; | |
1089 | inode->i_private = data; | |
1090 | if (fops) | |
1091 | inode->i_fop = fops; | |
1092 | if (iops) | |
1093 | inode->i_op = iops; | |
1094 | } | |
1095 | ||
1096 | return inode; | |
1097 | } | |
1098 | ||
ddf8abd2 | 1099 | /* Create "regular" file */ |
1bb27cac | 1100 | static struct dentry *ffs_sb_create_file(struct super_block *sb, |
ddf8abd2 | 1101 | const char *name, void *data, |
1bb27cac | 1102 | const struct file_operations *fops) |
ddf8abd2 MN |
1103 | { |
1104 | struct ffs_data *ffs = sb->s_fs_info; | |
1105 | struct dentry *dentry; | |
1106 | struct inode *inode; | |
1107 | ||
1108 | ENTER(); | |
1109 | ||
1110 | dentry = d_alloc_name(sb->s_root, name); | |
1111 | if (unlikely(!dentry)) | |
1112 | return NULL; | |
1113 | ||
1114 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); | |
1115 | if (unlikely(!inode)) { | |
1116 | dput(dentry); | |
1117 | return NULL; | |
1118 | } | |
1119 | ||
1120 | d_add(dentry, inode); | |
1bb27cac | 1121 | return dentry; |
ddf8abd2 MN |
1122 | } |
1123 | ||
ddf8abd2 | 1124 | /* Super block */ |
ddf8abd2 MN |
1125 | static const struct super_operations ffs_sb_operations = { |
1126 | .statfs = simple_statfs, | |
1127 | .drop_inode = generic_delete_inode, | |
1128 | }; | |
1129 | ||
1130 | struct ffs_sb_fill_data { | |
1131 | struct ffs_file_perms perms; | |
1132 | umode_t root_mode; | |
1133 | const char *dev_name; | |
18d6b32f | 1134 | bool no_disconnect; |
2606b28a | 1135 | struct ffs_data *ffs_data; |
ddf8abd2 MN |
1136 | }; |
1137 | ||
1138 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) | |
1139 | { | |
1140 | struct ffs_sb_fill_data *data = _data; | |
1141 | struct inode *inode; | |
2606b28a | 1142 | struct ffs_data *ffs = data->ffs_data; |
ddf8abd2 MN |
1143 | |
1144 | ENTER(); | |
1145 | ||
ddf8abd2 | 1146 | ffs->sb = sb; |
2606b28a | 1147 | data->ffs_data = NULL; |
ddf8abd2 | 1148 | sb->s_fs_info = ffs; |
09cbfeaf KS |
1149 | sb->s_blocksize = PAGE_SIZE; |
1150 | sb->s_blocksize_bits = PAGE_SHIFT; | |
ddf8abd2 MN |
1151 | sb->s_magic = FUNCTIONFS_MAGIC; |
1152 | sb->s_op = &ffs_sb_operations; | |
1153 | sb->s_time_gran = 1; | |
1154 | ||
1155 | /* Root inode */ | |
1156 | data->perms.mode = data->root_mode; | |
1157 | inode = ffs_sb_make_inode(sb, NULL, | |
1158 | &simple_dir_operations, | |
1159 | &simple_dir_inode_operations, | |
1160 | &data->perms); | |
48fde701 AV |
1161 | sb->s_root = d_make_root(inode); |
1162 | if (unlikely(!sb->s_root)) | |
2606b28a | 1163 | return -ENOMEM; |
ddf8abd2 MN |
1164 | |
1165 | /* EP0 file */ | |
1166 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, | |
1bb27cac | 1167 | &ffs_ep0_operations))) |
2606b28a | 1168 | return -ENOMEM; |
ddf8abd2 MN |
1169 | |
1170 | return 0; | |
ddf8abd2 MN |
1171 | } |
1172 | ||
ddf8abd2 MN |
1173 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
1174 | { | |
1175 | ENTER(); | |
1176 | ||
1177 | if (!opts || !*opts) | |
1178 | return 0; | |
1179 | ||
1180 | for (;;) { | |
ddf8abd2 | 1181 | unsigned long value; |
afd2e186 | 1182 | char *eq, *comma; |
ddf8abd2 MN |
1183 | |
1184 | /* Option limit */ | |
1185 | comma = strchr(opts, ','); | |
1186 | if (comma) | |
1187 | *comma = 0; | |
1188 | ||
1189 | /* Value limit */ | |
1190 | eq = strchr(opts, '='); | |
1191 | if (unlikely(!eq)) { | |
aa02f172 | 1192 | pr_err("'=' missing in %s\n", opts); |
ddf8abd2 MN |
1193 | return -EINVAL; |
1194 | } | |
1195 | *eq = 0; | |
1196 | ||
1197 | /* Parse value */ | |
afd2e186 | 1198 | if (kstrtoul(eq + 1, 0, &value)) { |
aa02f172 | 1199 | pr_err("%s: invalid value: %s\n", opts, eq + 1); |
ddf8abd2 MN |
1200 | return -EINVAL; |
1201 | } | |
1202 | ||
1203 | /* Interpret option */ | |
1204 | switch (eq - opts) { | |
18d6b32f RB |
1205 | case 13: |
1206 | if (!memcmp(opts, "no_disconnect", 13)) | |
1207 | data->no_disconnect = !!value; | |
1208 | else | |
1209 | goto invalid; | |
1210 | break; | |
ddf8abd2 MN |
1211 | case 5: |
1212 | if (!memcmp(opts, "rmode", 5)) | |
1213 | data->root_mode = (value & 0555) | S_IFDIR; | |
1214 | else if (!memcmp(opts, "fmode", 5)) | |
1215 | data->perms.mode = (value & 0666) | S_IFREG; | |
1216 | else | |
1217 | goto invalid; | |
1218 | break; | |
1219 | ||
1220 | case 4: | |
1221 | if (!memcmp(opts, "mode", 4)) { | |
1222 | data->root_mode = (value & 0555) | S_IFDIR; | |
1223 | data->perms.mode = (value & 0666) | S_IFREG; | |
1224 | } else { | |
1225 | goto invalid; | |
1226 | } | |
1227 | break; | |
1228 | ||
1229 | case 3: | |
b9b73f7c EB |
1230 | if (!memcmp(opts, "uid", 3)) { |
1231 | data->perms.uid = make_kuid(current_user_ns(), value); | |
1232 | if (!uid_valid(data->perms.uid)) { | |
1233 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1234 | return -EINVAL; | |
1235 | } | |
b8100750 | 1236 | } else if (!memcmp(opts, "gid", 3)) { |
b9b73f7c EB |
1237 | data->perms.gid = make_kgid(current_user_ns(), value); |
1238 | if (!gid_valid(data->perms.gid)) { | |
1239 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1240 | return -EINVAL; | |
1241 | } | |
b8100750 | 1242 | } else { |
ddf8abd2 | 1243 | goto invalid; |
b8100750 | 1244 | } |
ddf8abd2 MN |
1245 | break; |
1246 | ||
1247 | default: | |
1248 | invalid: | |
aa02f172 | 1249 | pr_err("%s: invalid option\n", opts); |
ddf8abd2 MN |
1250 | return -EINVAL; |
1251 | } | |
1252 | ||
1253 | /* Next iteration */ | |
1254 | if (!comma) | |
1255 | break; | |
1256 | opts = comma + 1; | |
1257 | } | |
1258 | ||
1259 | return 0; | |
1260 | } | |
1261 | ||
ddf8abd2 MN |
1262 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
1263 | ||
fc14f2fe AV |
1264 | static struct dentry * |
1265 | ffs_fs_mount(struct file_system_type *t, int flags, | |
1266 | const char *dev_name, void *opts) | |
ddf8abd2 MN |
1267 | { |
1268 | struct ffs_sb_fill_data data = { | |
1269 | .perms = { | |
1270 | .mode = S_IFREG | 0600, | |
b9b73f7c EB |
1271 | .uid = GLOBAL_ROOT_UID, |
1272 | .gid = GLOBAL_ROOT_GID, | |
ddf8abd2 MN |
1273 | }, |
1274 | .root_mode = S_IFDIR | 0500, | |
18d6b32f | 1275 | .no_disconnect = false, |
ddf8abd2 | 1276 | }; |
581791f5 | 1277 | struct dentry *rv; |
ddf8abd2 | 1278 | int ret; |
581791f5 | 1279 | void *ffs_dev; |
2606b28a | 1280 | struct ffs_data *ffs; |
ddf8abd2 MN |
1281 | |
1282 | ENTER(); | |
1283 | ||
ddf8abd2 MN |
1284 | ret = ffs_fs_parse_opts(&data, opts); |
1285 | if (unlikely(ret < 0)) | |
fc14f2fe | 1286 | return ERR_PTR(ret); |
ddf8abd2 | 1287 | |
2606b28a AV |
1288 | ffs = ffs_data_new(); |
1289 | if (unlikely(!ffs)) | |
1290 | return ERR_PTR(-ENOMEM); | |
1291 | ffs->file_perms = data.perms; | |
18d6b32f | 1292 | ffs->no_disconnect = data.no_disconnect; |
2606b28a AV |
1293 | |
1294 | ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); | |
1295 | if (unlikely(!ffs->dev_name)) { | |
1296 | ffs_data_put(ffs); | |
1297 | return ERR_PTR(-ENOMEM); | |
1298 | } | |
1299 | ||
4b187fce | 1300 | ffs_dev = ffs_acquire_dev(dev_name); |
2606b28a AV |
1301 | if (IS_ERR(ffs_dev)) { |
1302 | ffs_data_put(ffs); | |
1303 | return ERR_CAST(ffs_dev); | |
1304 | } | |
1305 | ffs->private_data = ffs_dev; | |
1306 | data.ffs_data = ffs; | |
581791f5 | 1307 | |
581791f5 | 1308 | rv = mount_nodev(t, flags, &data, ffs_sb_fill); |
2606b28a | 1309 | if (IS_ERR(rv) && data.ffs_data) { |
4b187fce | 1310 | ffs_release_dev(data.ffs_data); |
2606b28a AV |
1311 | ffs_data_put(data.ffs_data); |
1312 | } | |
581791f5 | 1313 | return rv; |
ddf8abd2 MN |
1314 | } |
1315 | ||
1316 | static void | |
1317 | ffs_fs_kill_sb(struct super_block *sb) | |
1318 | { | |
ddf8abd2 MN |
1319 | ENTER(); |
1320 | ||
1321 | kill_litter_super(sb); | |
581791f5 | 1322 | if (sb->s_fs_info) { |
4b187fce | 1323 | ffs_release_dev(sb->s_fs_info); |
18d6b32f | 1324 | ffs_data_closed(sb->s_fs_info); |
5b5f9560 | 1325 | ffs_data_put(sb->s_fs_info); |
581791f5 | 1326 | } |
ddf8abd2 MN |
1327 | } |
1328 | ||
1329 | static struct file_system_type ffs_fs_type = { | |
1330 | .owner = THIS_MODULE, | |
1331 | .name = "functionfs", | |
fc14f2fe | 1332 | .mount = ffs_fs_mount, |
ddf8abd2 MN |
1333 | .kill_sb = ffs_fs_kill_sb, |
1334 | }; | |
7f78e035 | 1335 | MODULE_ALIAS_FS("functionfs"); |
ddf8abd2 MN |
1336 | |
1337 | ||
ddf8abd2 MN |
1338 | /* Driver's main init/cleanup functions *************************************/ |
1339 | ||
ddf8abd2 MN |
1340 | static int functionfs_init(void) |
1341 | { | |
1342 | int ret; | |
1343 | ||
1344 | ENTER(); | |
1345 | ||
1346 | ret = register_filesystem(&ffs_fs_type); | |
1347 | if (likely(!ret)) | |
aa02f172 | 1348 | pr_info("file system registered\n"); |
ddf8abd2 | 1349 | else |
aa02f172 | 1350 | pr_err("failed registering file system (%d)\n", ret); |
ddf8abd2 MN |
1351 | |
1352 | return ret; | |
1353 | } | |
1354 | ||
1355 | static void functionfs_cleanup(void) | |
1356 | { | |
1357 | ENTER(); | |
1358 | ||
aa02f172 | 1359 | pr_info("unloading\n"); |
ddf8abd2 MN |
1360 | unregister_filesystem(&ffs_fs_type); |
1361 | } | |
1362 | ||
1363 | ||
ddf8abd2 MN |
1364 | /* ffs_data and ffs_function construction and destruction code **************/ |
1365 | ||
1366 | static void ffs_data_clear(struct ffs_data *ffs); | |
1367 | static void ffs_data_reset(struct ffs_data *ffs); | |
1368 | ||
ddf8abd2 MN |
1369 | static void ffs_data_get(struct ffs_data *ffs) |
1370 | { | |
1371 | ENTER(); | |
1372 | ||
1373 | atomic_inc(&ffs->ref); | |
1374 | } | |
1375 | ||
1376 | static void ffs_data_opened(struct ffs_data *ffs) | |
1377 | { | |
1378 | ENTER(); | |
1379 | ||
1380 | atomic_inc(&ffs->ref); | |
18d6b32f RB |
1381 | if (atomic_add_return(1, &ffs->opened) == 1 && |
1382 | ffs->state == FFS_DEACTIVATED) { | |
1383 | ffs->state = FFS_CLOSING; | |
1384 | ffs_data_reset(ffs); | |
1385 | } | |
ddf8abd2 MN |
1386 | } |
1387 | ||
1388 | static void ffs_data_put(struct ffs_data *ffs) | |
1389 | { | |
1390 | ENTER(); | |
1391 | ||
1392 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { | |
aa02f172 | 1393 | pr_info("%s(): freeing\n", __func__); |
ddf8abd2 | 1394 | ffs_data_clear(ffs); |
647d5580 | 1395 | BUG_ON(waitqueue_active(&ffs->ev.waitq) || |
ddf8abd2 | 1396 | waitqueue_active(&ffs->ep0req_completion.wait)); |
581791f5 | 1397 | kfree(ffs->dev_name); |
ddf8abd2 MN |
1398 | kfree(ffs); |
1399 | } | |
1400 | } | |
1401 | ||
ddf8abd2 MN |
1402 | static void ffs_data_closed(struct ffs_data *ffs) |
1403 | { | |
1404 | ENTER(); | |
1405 | ||
1406 | if (atomic_dec_and_test(&ffs->opened)) { | |
18d6b32f RB |
1407 | if (ffs->no_disconnect) { |
1408 | ffs->state = FFS_DEACTIVATED; | |
1409 | if (ffs->epfiles) { | |
1410 | ffs_epfiles_destroy(ffs->epfiles, | |
1411 | ffs->eps_count); | |
1412 | ffs->epfiles = NULL; | |
1413 | } | |
1414 | if (ffs->setup_state == FFS_SETUP_PENDING) | |
1415 | __ffs_ep0_stall(ffs); | |
1416 | } else { | |
1417 | ffs->state = FFS_CLOSING; | |
1418 | ffs_data_reset(ffs); | |
1419 | } | |
1420 | } | |
1421 | if (atomic_read(&ffs->opened) < 0) { | |
ddf8abd2 MN |
1422 | ffs->state = FFS_CLOSING; |
1423 | ffs_data_reset(ffs); | |
1424 | } | |
1425 | ||
1426 | ffs_data_put(ffs); | |
1427 | } | |
1428 | ||
ddf8abd2 MN |
1429 | static struct ffs_data *ffs_data_new(void) |
1430 | { | |
1431 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); | |
1432 | if (unlikely(!ffs)) | |
f8800d47 | 1433 | return NULL; |
ddf8abd2 MN |
1434 | |
1435 | ENTER(); | |
1436 | ||
1437 | atomic_set(&ffs->ref, 1); | |
1438 | atomic_set(&ffs->opened, 0); | |
1439 | ffs->state = FFS_READ_DESCRIPTORS; | |
1440 | mutex_init(&ffs->mutex); | |
1441 | spin_lock_init(&ffs->eps_lock); | |
1442 | init_waitqueue_head(&ffs->ev.waitq); | |
1443 | init_completion(&ffs->ep0req_completion); | |
1444 | ||
1445 | /* XXX REVISIT need to update it in some places, or do we? */ | |
1446 | ffs->ev.can_stall = 1; | |
1447 | ||
1448 | return ffs; | |
1449 | } | |
1450 | ||
ddf8abd2 MN |
1451 | static void ffs_data_clear(struct ffs_data *ffs) |
1452 | { | |
1453 | ENTER(); | |
1454 | ||
49a79d8b | 1455 | ffs_closed(ffs); |
ddf8abd2 MN |
1456 | |
1457 | BUG_ON(ffs->gadget); | |
1458 | ||
1459 | if (ffs->epfiles) | |
1460 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); | |
1461 | ||
5e33f6fd RB |
1462 | if (ffs->ffs_eventfd) |
1463 | eventfd_ctx_put(ffs->ffs_eventfd); | |
1464 | ||
ac8dde11 | 1465 | kfree(ffs->raw_descs_data); |
ddf8abd2 MN |
1466 | kfree(ffs->raw_strings); |
1467 | kfree(ffs->stringtabs); | |
1468 | } | |
1469 | ||
ddf8abd2 MN |
1470 | static void ffs_data_reset(struct ffs_data *ffs) |
1471 | { | |
1472 | ENTER(); | |
1473 | ||
1474 | ffs_data_clear(ffs); | |
1475 | ||
1476 | ffs->epfiles = NULL; | |
ac8dde11 | 1477 | ffs->raw_descs_data = NULL; |
ddf8abd2 MN |
1478 | ffs->raw_descs = NULL; |
1479 | ffs->raw_strings = NULL; | |
1480 | ffs->stringtabs = NULL; | |
1481 | ||
1482 | ffs->raw_descs_length = 0; | |
ddf8abd2 MN |
1483 | ffs->fs_descs_count = 0; |
1484 | ffs->hs_descs_count = 0; | |
8d4e897b | 1485 | ffs->ss_descs_count = 0; |
ddf8abd2 MN |
1486 | |
1487 | ffs->strings_count = 0; | |
1488 | ffs->interfaces_count = 0; | |
1489 | ffs->eps_count = 0; | |
1490 | ||
1491 | ffs->ev.count = 0; | |
1492 | ||
1493 | ffs->state = FFS_READ_DESCRIPTORS; | |
1494 | ffs->setup_state = FFS_NO_SETUP; | |
1495 | ffs->flags = 0; | |
1496 | } | |
1497 | ||
1498 | ||
1499 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) | |
1500 | { | |
fd7c9a00 MN |
1501 | struct usb_gadget_strings **lang; |
1502 | int first_id; | |
ddf8abd2 MN |
1503 | |
1504 | ENTER(); | |
1505 | ||
1506 | if (WARN_ON(ffs->state != FFS_ACTIVE | |
1507 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) | |
1508 | return -EBADFD; | |
1509 | ||
fd7c9a00 MN |
1510 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
1511 | if (unlikely(first_id < 0)) | |
1512 | return first_id; | |
ddf8abd2 MN |
1513 | |
1514 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); | |
1515 | if (unlikely(!ffs->ep0req)) | |
1516 | return -ENOMEM; | |
1517 | ffs->ep0req->complete = ffs_ep0_complete; | |
1518 | ffs->ep0req->context = ffs; | |
1519 | ||
fd7c9a00 | 1520 | lang = ffs->stringtabs; |
f0688c8b MN |
1521 | if (lang) { |
1522 | for (; *lang; ++lang) { | |
1523 | struct usb_string *str = (*lang)->strings; | |
1524 | int id = first_id; | |
1525 | for (; str->s; ++id, ++str) | |
1526 | str->id = id; | |
1527 | } | |
ddf8abd2 MN |
1528 | } |
1529 | ||
1530 | ffs->gadget = cdev->gadget; | |
fd7c9a00 | 1531 | ffs_data_get(ffs); |
ddf8abd2 MN |
1532 | return 0; |
1533 | } | |
1534 | ||
ddf8abd2 MN |
1535 | static void functionfs_unbind(struct ffs_data *ffs) |
1536 | { | |
1537 | ENTER(); | |
1538 | ||
1539 | if (!WARN_ON(!ffs->gadget)) { | |
1540 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); | |
1541 | ffs->ep0req = NULL; | |
1542 | ffs->gadget = NULL; | |
e2190a97 | 1543 | clear_bit(FFS_FL_BOUND, &ffs->flags); |
df498995 | 1544 | ffs_data_put(ffs); |
ddf8abd2 MN |
1545 | } |
1546 | } | |
1547 | ||
ddf8abd2 MN |
1548 | static int ffs_epfiles_create(struct ffs_data *ffs) |
1549 | { | |
1550 | struct ffs_epfile *epfile, *epfiles; | |
1551 | unsigned i, count; | |
1552 | ||
1553 | ENTER(); | |
1554 | ||
1555 | count = ffs->eps_count; | |
9823a525 | 1556 | epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL); |
ddf8abd2 MN |
1557 | if (!epfiles) |
1558 | return -ENOMEM; | |
1559 | ||
1560 | epfile = epfiles; | |
1561 | for (i = 1; i <= count; ++i, ++epfile) { | |
1562 | epfile->ffs = ffs; | |
1563 | mutex_init(&epfile->mutex); | |
1564 | init_waitqueue_head(&epfile->wait); | |
1b0bf88f | 1565 | if (ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) |
acba23fe | 1566 | sprintf(epfile->name, "ep%02x", ffs->eps_addrmap[i]); |
1b0bf88f | 1567 | else |
acba23fe MS |
1568 | sprintf(epfile->name, "ep%u", i); |
1569 | epfile->dentry = ffs_sb_create_file(ffs->sb, epfile->name, | |
1bb27cac AV |
1570 | epfile, |
1571 | &ffs_epfile_operations); | |
1572 | if (unlikely(!epfile->dentry)) { | |
ddf8abd2 MN |
1573 | ffs_epfiles_destroy(epfiles, i - 1); |
1574 | return -ENOMEM; | |
1575 | } | |
1576 | } | |
1577 | ||
1578 | ffs->epfiles = epfiles; | |
1579 | return 0; | |
1580 | } | |
1581 | ||
ddf8abd2 MN |
1582 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
1583 | { | |
1584 | struct ffs_epfile *epfile = epfiles; | |
1585 | ||
1586 | ENTER(); | |
1587 | ||
1588 | for (; count; --count, ++epfile) { | |
1589 | BUG_ON(mutex_is_locked(&epfile->mutex) || | |
1590 | waitqueue_active(&epfile->wait)); | |
1591 | if (epfile->dentry) { | |
1592 | d_delete(epfile->dentry); | |
1593 | dput(epfile->dentry); | |
1594 | epfile->dentry = NULL; | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | kfree(epfiles); | |
1599 | } | |
1600 | ||
ddf8abd2 MN |
1601 | static void ffs_func_eps_disable(struct ffs_function *func) |
1602 | { | |
1603 | struct ffs_ep *ep = func->eps; | |
1604 | struct ffs_epfile *epfile = func->ffs->epfiles; | |
1605 | unsigned count = func->ffs->eps_count; | |
1606 | unsigned long flags; | |
1607 | ||
1608 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1609 | do { | |
1610 | /* pending requests get nuked */ | |
1611 | if (likely(ep->ep)) | |
1612 | usb_ep_disable(ep->ep); | |
ddf8abd2 | 1613 | ++ep; |
18d6b32f RB |
1614 | |
1615 | if (epfile) { | |
1616 | epfile->ep = NULL; | |
1617 | ++epfile; | |
1618 | } | |
ddf8abd2 MN |
1619 | } while (--count); |
1620 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1621 | } | |
1622 | ||
1623 | static int ffs_func_eps_enable(struct ffs_function *func) | |
1624 | { | |
1625 | struct ffs_data *ffs = func->ffs; | |
1626 | struct ffs_ep *ep = func->eps; | |
1627 | struct ffs_epfile *epfile = ffs->epfiles; | |
1628 | unsigned count = ffs->eps_count; | |
1629 | unsigned long flags; | |
1630 | int ret = 0; | |
1631 | ||
1632 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1633 | do { | |
1634 | struct usb_endpoint_descriptor *ds; | |
8d4e897b MG |
1635 | int desc_idx; |
1636 | ||
1637 | if (ffs->gadget->speed == USB_SPEED_SUPER) | |
1638 | desc_idx = 2; | |
1639 | else if (ffs->gadget->speed == USB_SPEED_HIGH) | |
1640 | desc_idx = 1; | |
1641 | else | |
1642 | desc_idx = 0; | |
1643 | ||
1644 | /* fall-back to lower speed if desc missing for current speed */ | |
1645 | do { | |
1646 | ds = ep->descs[desc_idx]; | |
1647 | } while (!ds && --desc_idx >= 0); | |
1648 | ||
1649 | if (!ds) { | |
1650 | ret = -EINVAL; | |
1651 | break; | |
1652 | } | |
ddf8abd2 MN |
1653 | |
1654 | ep->ep->driver_data = ep; | |
72c973dd TB |
1655 | ep->ep->desc = ds; |
1656 | ret = usb_ep_enable(ep->ep); | |
ddf8abd2 MN |
1657 | if (likely(!ret)) { |
1658 | epfile->ep = ep; | |
1659 | epfile->in = usb_endpoint_dir_in(ds); | |
1660 | epfile->isoc = usb_endpoint_xfer_isoc(ds); | |
1661 | } else { | |
1662 | break; | |
1663 | } | |
1664 | ||
1665 | wake_up(&epfile->wait); | |
1666 | ||
1667 | ++ep; | |
1668 | ++epfile; | |
1669 | } while (--count); | |
1670 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1671 | ||
1672 | return ret; | |
1673 | } | |
1674 | ||
1675 | ||
1676 | /* Parsing and building descriptors and strings *****************************/ | |
1677 | ||
5ab54cf7 MN |
1678 | /* |
1679 | * This validates if data pointed by data is a valid USB descriptor as | |
ddf8abd2 | 1680 | * well as record how many interfaces, endpoints and strings are |
5ab54cf7 MN |
1681 | * required by given configuration. Returns address after the |
1682 | * descriptor or NULL if data is invalid. | |
1683 | */ | |
ddf8abd2 MN |
1684 | |
1685 | enum ffs_entity_type { | |
1686 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT | |
1687 | }; | |
1688 | ||
f0175ab5 AP |
1689 | enum ffs_os_desc_type { |
1690 | FFS_OS_DESC, FFS_OS_DESC_EXT_COMPAT, FFS_OS_DESC_EXT_PROP | |
1691 | }; | |
1692 | ||
ddf8abd2 MN |
1693 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, |
1694 | u8 *valuep, | |
1695 | struct usb_descriptor_header *desc, | |
1696 | void *priv); | |
1697 | ||
f0175ab5 AP |
1698 | typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, |
1699 | struct usb_os_desc_header *h, void *data, | |
1700 | unsigned len, void *priv); | |
1701 | ||
f96cbd14 AP |
1702 | static int __must_check ffs_do_single_desc(char *data, unsigned len, |
1703 | ffs_entity_callback entity, | |
1704 | void *priv) | |
ddf8abd2 MN |
1705 | { |
1706 | struct usb_descriptor_header *_ds = (void *)data; | |
1707 | u8 length; | |
1708 | int ret; | |
1709 | ||
1710 | ENTER(); | |
1711 | ||
1712 | /* At least two bytes are required: length and type */ | |
1713 | if (len < 2) { | |
aa02f172 | 1714 | pr_vdebug("descriptor too short\n"); |
ddf8abd2 MN |
1715 | return -EINVAL; |
1716 | } | |
1717 | ||
1718 | /* If we have at least as many bytes as the descriptor takes? */ | |
1719 | length = _ds->bLength; | |
1720 | if (len < length) { | |
aa02f172 | 1721 | pr_vdebug("descriptor longer then available data\n"); |
ddf8abd2 MN |
1722 | return -EINVAL; |
1723 | } | |
1724 | ||
1725 | #define __entity_check_INTERFACE(val) 1 | |
1726 | #define __entity_check_STRING(val) (val) | |
1727 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) | |
1728 | #define __entity(type, val) do { \ | |
aa02f172 | 1729 | pr_vdebug("entity " #type "(%02x)\n", (val)); \ |
ddf8abd2 | 1730 | if (unlikely(!__entity_check_ ##type(val))) { \ |
aa02f172 | 1731 | pr_vdebug("invalid entity's value\n"); \ |
ddf8abd2 MN |
1732 | return -EINVAL; \ |
1733 | } \ | |
1734 | ret = entity(FFS_ ##type, &val, _ds, priv); \ | |
1735 | if (unlikely(ret < 0)) { \ | |
aa02f172 | 1736 | pr_debug("entity " #type "(%02x); ret = %d\n", \ |
d8df0b61 | 1737 | (val), ret); \ |
ddf8abd2 MN |
1738 | return ret; \ |
1739 | } \ | |
1740 | } while (0) | |
1741 | ||
1742 | /* Parse descriptor depending on type. */ | |
1743 | switch (_ds->bDescriptorType) { | |
1744 | case USB_DT_DEVICE: | |
1745 | case USB_DT_CONFIG: | |
1746 | case USB_DT_STRING: | |
1747 | case USB_DT_DEVICE_QUALIFIER: | |
1748 | /* function can't have any of those */ | |
aa02f172 | 1749 | pr_vdebug("descriptor reserved for gadget: %d\n", |
5ab54cf7 | 1750 | _ds->bDescriptorType); |
ddf8abd2 MN |
1751 | return -EINVAL; |
1752 | ||
1753 | case USB_DT_INTERFACE: { | |
1754 | struct usb_interface_descriptor *ds = (void *)_ds; | |
aa02f172 | 1755 | pr_vdebug("interface descriptor\n"); |
ddf8abd2 MN |
1756 | if (length != sizeof *ds) |
1757 | goto inv_length; | |
1758 | ||
1759 | __entity(INTERFACE, ds->bInterfaceNumber); | |
1760 | if (ds->iInterface) | |
1761 | __entity(STRING, ds->iInterface); | |
1762 | } | |
1763 | break; | |
1764 | ||
1765 | case USB_DT_ENDPOINT: { | |
1766 | struct usb_endpoint_descriptor *ds = (void *)_ds; | |
aa02f172 | 1767 | pr_vdebug("endpoint descriptor\n"); |
ddf8abd2 MN |
1768 | if (length != USB_DT_ENDPOINT_SIZE && |
1769 | length != USB_DT_ENDPOINT_AUDIO_SIZE) | |
1770 | goto inv_length; | |
1771 | __entity(ENDPOINT, ds->bEndpointAddress); | |
1772 | } | |
1773 | break; | |
1774 | ||
560f1187 KB |
1775 | case HID_DT_HID: |
1776 | pr_vdebug("hid descriptor\n"); | |
1777 | if (length != sizeof(struct hid_descriptor)) | |
1778 | goto inv_length; | |
1779 | break; | |
1780 | ||
ddf8abd2 MN |
1781 | case USB_DT_OTG: |
1782 | if (length != sizeof(struct usb_otg_descriptor)) | |
1783 | goto inv_length; | |
1784 | break; | |
1785 | ||
1786 | case USB_DT_INTERFACE_ASSOCIATION: { | |
1787 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; | |
aa02f172 | 1788 | pr_vdebug("interface association descriptor\n"); |
ddf8abd2 MN |
1789 | if (length != sizeof *ds) |
1790 | goto inv_length; | |
1791 | if (ds->iFunction) | |
1792 | __entity(STRING, ds->iFunction); | |
1793 | } | |
1794 | break; | |
1795 | ||
8d4e897b MG |
1796 | case USB_DT_SS_ENDPOINT_COMP: |
1797 | pr_vdebug("EP SS companion descriptor\n"); | |
1798 | if (length != sizeof(struct usb_ss_ep_comp_descriptor)) | |
1799 | goto inv_length; | |
1800 | break; | |
1801 | ||
ddf8abd2 MN |
1802 | case USB_DT_OTHER_SPEED_CONFIG: |
1803 | case USB_DT_INTERFACE_POWER: | |
1804 | case USB_DT_DEBUG: | |
1805 | case USB_DT_SECURITY: | |
1806 | case USB_DT_CS_RADIO_CONTROL: | |
1807 | /* TODO */ | |
aa02f172 | 1808 | pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1809 | return -EINVAL; |
1810 | ||
1811 | default: | |
1812 | /* We should never be here */ | |
aa02f172 | 1813 | pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
1814 | return -EINVAL; |
1815 | ||
5ab54cf7 | 1816 | inv_length: |
aa02f172 | 1817 | pr_vdebug("invalid length: %d (descriptor %d)\n", |
d8df0b61 | 1818 | _ds->bLength, _ds->bDescriptorType); |
ddf8abd2 MN |
1819 | return -EINVAL; |
1820 | } | |
1821 | ||
1822 | #undef __entity | |
1823 | #undef __entity_check_DESCRIPTOR | |
1824 | #undef __entity_check_INTERFACE | |
1825 | #undef __entity_check_STRING | |
1826 | #undef __entity_check_ENDPOINT | |
1827 | ||
1828 | return length; | |
1829 | } | |
1830 | ||
ddf8abd2 MN |
1831 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
1832 | ffs_entity_callback entity, void *priv) | |
1833 | { | |
1834 | const unsigned _len = len; | |
1835 | unsigned long num = 0; | |
1836 | ||
1837 | ENTER(); | |
1838 | ||
1839 | for (;;) { | |
1840 | int ret; | |
1841 | ||
1842 | if (num == count) | |
1843 | data = NULL; | |
1844 | ||
5ab54cf7 | 1845 | /* Record "descriptor" entity */ |
ddf8abd2 MN |
1846 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
1847 | if (unlikely(ret < 0)) { | |
aa02f172 | 1848 | pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", |
d8df0b61 | 1849 | num, ret); |
ddf8abd2 MN |
1850 | return ret; |
1851 | } | |
1852 | ||
1853 | if (!data) | |
1854 | return _len - len; | |
1855 | ||
f96cbd14 | 1856 | ret = ffs_do_single_desc(data, len, entity, priv); |
ddf8abd2 | 1857 | if (unlikely(ret < 0)) { |
aa02f172 | 1858 | pr_debug("%s returns %d\n", __func__, ret); |
ddf8abd2 MN |
1859 | return ret; |
1860 | } | |
1861 | ||
1862 | len -= ret; | |
1863 | data += ret; | |
1864 | ++num; | |
1865 | } | |
1866 | } | |
1867 | ||
ddf8abd2 MN |
1868 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
1869 | u8 *valuep, struct usb_descriptor_header *desc, | |
1870 | void *priv) | |
1871 | { | |
6d5c1c77 RB |
1872 | struct ffs_desc_helper *helper = priv; |
1873 | struct usb_endpoint_descriptor *d; | |
ddf8abd2 MN |
1874 | |
1875 | ENTER(); | |
1876 | ||
1877 | switch (type) { | |
1878 | case FFS_DESCRIPTOR: | |
1879 | break; | |
1880 | ||
1881 | case FFS_INTERFACE: | |
5ab54cf7 MN |
1882 | /* |
1883 | * Interfaces are indexed from zero so if we | |
ddf8abd2 | 1884 | * encountered interface "n" then there are at least |
5ab54cf7 MN |
1885 | * "n+1" interfaces. |
1886 | */ | |
6d5c1c77 RB |
1887 | if (*valuep >= helper->interfaces_count) |
1888 | helper->interfaces_count = *valuep + 1; | |
ddf8abd2 MN |
1889 | break; |
1890 | ||
1891 | case FFS_STRING: | |
5ab54cf7 MN |
1892 | /* |
1893 | * Strings are indexed from 1 (0 is magic ;) reserved | |
1894 | * for languages list or some such) | |
1895 | */ | |
6d5c1c77 RB |
1896 | if (*valuep > helper->ffs->strings_count) |
1897 | helper->ffs->strings_count = *valuep; | |
ddf8abd2 MN |
1898 | break; |
1899 | ||
1900 | case FFS_ENDPOINT: | |
6d5c1c77 RB |
1901 | d = (void *)desc; |
1902 | helper->eps_count++; | |
1903 | if (helper->eps_count >= 15) | |
1904 | return -EINVAL; | |
1905 | /* Check if descriptors for any speed were already parsed */ | |
1906 | if (!helper->ffs->eps_count && !helper->ffs->interfaces_count) | |
1907 | helper->ffs->eps_addrmap[helper->eps_count] = | |
1908 | d->bEndpointAddress; | |
1909 | else if (helper->ffs->eps_addrmap[helper->eps_count] != | |
1910 | d->bEndpointAddress) | |
1911 | return -EINVAL; | |
ddf8abd2 MN |
1912 | break; |
1913 | } | |
1914 | ||
1915 | return 0; | |
1916 | } | |
1917 | ||
f0175ab5 AP |
1918 | static int __ffs_do_os_desc_header(enum ffs_os_desc_type *next_type, |
1919 | struct usb_os_desc_header *desc) | |
1920 | { | |
1921 | u16 bcd_version = le16_to_cpu(desc->bcdVersion); | |
1922 | u16 w_index = le16_to_cpu(desc->wIndex); | |
1923 | ||
1924 | if (bcd_version != 1) { | |
1925 | pr_vdebug("unsupported os descriptors version: %d", | |
1926 | bcd_version); | |
1927 | return -EINVAL; | |
1928 | } | |
1929 | switch (w_index) { | |
1930 | case 0x4: | |
1931 | *next_type = FFS_OS_DESC_EXT_COMPAT; | |
1932 | break; | |
1933 | case 0x5: | |
1934 | *next_type = FFS_OS_DESC_EXT_PROP; | |
1935 | break; | |
1936 | default: | |
1937 | pr_vdebug("unsupported os descriptor type: %d", w_index); | |
1938 | return -EINVAL; | |
1939 | } | |
1940 | ||
1941 | return sizeof(*desc); | |
1942 | } | |
1943 | ||
1944 | /* | |
1945 | * Process all extended compatibility/extended property descriptors | |
1946 | * of a feature descriptor | |
1947 | */ | |
1948 | static int __must_check ffs_do_single_os_desc(char *data, unsigned len, | |
1949 | enum ffs_os_desc_type type, | |
1950 | u16 feature_count, | |
1951 | ffs_os_desc_callback entity, | |
1952 | void *priv, | |
1953 | struct usb_os_desc_header *h) | |
1954 | { | |
1955 | int ret; | |
1956 | const unsigned _len = len; | |
1957 | ||
1958 | ENTER(); | |
1959 | ||
1960 | /* loop over all ext compat/ext prop descriptors */ | |
1961 | while (feature_count--) { | |
1962 | ret = entity(type, h, data, len, priv); | |
1963 | if (unlikely(ret < 0)) { | |
1964 | pr_debug("bad OS descriptor, type: %d\n", type); | |
1965 | return ret; | |
1966 | } | |
1967 | data += ret; | |
1968 | len -= ret; | |
1969 | } | |
1970 | return _len - len; | |
1971 | } | |
1972 | ||
1973 | /* Process a number of complete Feature Descriptors (Ext Compat or Ext Prop) */ | |
1974 | static int __must_check ffs_do_os_descs(unsigned count, | |
1975 | char *data, unsigned len, | |
1976 | ffs_os_desc_callback entity, void *priv) | |
1977 | { | |
1978 | const unsigned _len = len; | |
1979 | unsigned long num = 0; | |
1980 | ||
1981 | ENTER(); | |
1982 | ||
1983 | for (num = 0; num < count; ++num) { | |
1984 | int ret; | |
1985 | enum ffs_os_desc_type type; | |
1986 | u16 feature_count; | |
1987 | struct usb_os_desc_header *desc = (void *)data; | |
1988 | ||
1989 | if (len < sizeof(*desc)) | |
1990 | return -EINVAL; | |
1991 | ||
1992 | /* | |
1993 | * Record "descriptor" entity. | |
1994 | * Process dwLength, bcdVersion, wIndex, get b/wCount. | |
1995 | * Move the data pointer to the beginning of extended | |
1996 | * compatibilities proper or extended properties proper | |
1997 | * portions of the data | |
1998 | */ | |
1999 | if (le32_to_cpu(desc->dwLength) > len) | |
2000 | return -EINVAL; | |
2001 | ||
2002 | ret = __ffs_do_os_desc_header(&type, desc); | |
2003 | if (unlikely(ret < 0)) { | |
2004 | pr_debug("entity OS_DESCRIPTOR(%02lx); ret = %d\n", | |
2005 | num, ret); | |
2006 | return ret; | |
2007 | } | |
2008 | /* | |
2009 | * 16-bit hex "?? 00" Little Endian looks like 8-bit hex "??" | |
2010 | */ | |
2011 | feature_count = le16_to_cpu(desc->wCount); | |
2012 | if (type == FFS_OS_DESC_EXT_COMPAT && | |
2013 | (feature_count > 255 || desc->Reserved)) | |
2014 | return -EINVAL; | |
2015 | len -= ret; | |
2016 | data += ret; | |
2017 | ||
2018 | /* | |
2019 | * Process all function/property descriptors | |
2020 | * of this Feature Descriptor | |
2021 | */ | |
2022 | ret = ffs_do_single_os_desc(data, len, type, | |
2023 | feature_count, entity, priv, desc); | |
2024 | if (unlikely(ret < 0)) { | |
2025 | pr_debug("%s returns %d\n", __func__, ret); | |
2026 | return ret; | |
2027 | } | |
2028 | ||
2029 | len -= ret; | |
2030 | data += ret; | |
2031 | } | |
2032 | return _len - len; | |
2033 | } | |
2034 | ||
2035 | /** | |
2036 | * Validate contents of the buffer from userspace related to OS descriptors. | |
2037 | */ | |
2038 | static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, | |
2039 | struct usb_os_desc_header *h, void *data, | |
2040 | unsigned len, void *priv) | |
2041 | { | |
2042 | struct ffs_data *ffs = priv; | |
2043 | u8 length; | |
2044 | ||
2045 | ENTER(); | |
2046 | ||
2047 | switch (type) { | |
2048 | case FFS_OS_DESC_EXT_COMPAT: { | |
2049 | struct usb_ext_compat_desc *d = data; | |
2050 | int i; | |
2051 | ||
2052 | if (len < sizeof(*d) || | |
2053 | d->bFirstInterfaceNumber >= ffs->interfaces_count || | |
2054 | d->Reserved1) | |
2055 | return -EINVAL; | |
2056 | for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) | |
2057 | if (d->Reserved2[i]) | |
2058 | return -EINVAL; | |
2059 | ||
2060 | length = sizeof(struct usb_ext_compat_desc); | |
2061 | } | |
2062 | break; | |
2063 | case FFS_OS_DESC_EXT_PROP: { | |
2064 | struct usb_ext_prop_desc *d = data; | |
2065 | u32 type, pdl; | |
2066 | u16 pnl; | |
2067 | ||
2068 | if (len < sizeof(*d) || h->interface >= ffs->interfaces_count) | |
2069 | return -EINVAL; | |
2070 | length = le32_to_cpu(d->dwSize); | |
2071 | type = le32_to_cpu(d->dwPropertyDataType); | |
2072 | if (type < USB_EXT_PROP_UNICODE || | |
2073 | type > USB_EXT_PROP_UNICODE_MULTI) { | |
2074 | pr_vdebug("unsupported os descriptor property type: %d", | |
2075 | type); | |
2076 | return -EINVAL; | |
2077 | } | |
2078 | pnl = le16_to_cpu(d->wPropertyNameLength); | |
2079 | pdl = le32_to_cpu(*(u32 *)((u8 *)data + 10 + pnl)); | |
2080 | if (length != 14 + pnl + pdl) { | |
2081 | pr_vdebug("invalid os descriptor length: %d pnl:%d pdl:%d (descriptor %d)\n", | |
2082 | length, pnl, pdl, type); | |
2083 | return -EINVAL; | |
2084 | } | |
2085 | ++ffs->ms_os_descs_ext_prop_count; | |
2086 | /* property name reported to the host as "WCHAR"s */ | |
2087 | ffs->ms_os_descs_ext_prop_name_len += pnl * 2; | |
2088 | ffs->ms_os_descs_ext_prop_data_len += pdl; | |
2089 | } | |
2090 | break; | |
2091 | default: | |
2092 | pr_vdebug("unknown descriptor: %d\n", type); | |
2093 | return -EINVAL; | |
2094 | } | |
2095 | return length; | |
2096 | } | |
2097 | ||
ddf8abd2 MN |
2098 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
2099 | char *const _data, size_t len) | |
2100 | { | |
ac8dde11 | 2101 | char *data = _data, *raw_descs; |
f0175ab5 | 2102 | unsigned os_descs_count = 0, counts[3], flags; |
ac8dde11 | 2103 | int ret = -EINVAL, i; |
6d5c1c77 | 2104 | struct ffs_desc_helper helper; |
ddf8abd2 MN |
2105 | |
2106 | ENTER(); | |
2107 | ||
ac8dde11 | 2108 | if (get_unaligned_le32(data + 4) != len) |
ddf8abd2 | 2109 | goto error; |
ddf8abd2 | 2110 | |
ac8dde11 MN |
2111 | switch (get_unaligned_le32(data)) { |
2112 | case FUNCTIONFS_DESCRIPTORS_MAGIC: | |
2113 | flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; | |
2114 | data += 8; | |
2115 | len -= 8; | |
2116 | break; | |
2117 | case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: | |
2118 | flags = get_unaligned_le32(data + 8); | |
1b0bf88f | 2119 | ffs->user_flags = flags; |
ac8dde11 MN |
2120 | if (flags & ~(FUNCTIONFS_HAS_FS_DESC | |
2121 | FUNCTIONFS_HAS_HS_DESC | | |
f0175ab5 | 2122 | FUNCTIONFS_HAS_SS_DESC | |
1b0bf88f | 2123 | FUNCTIONFS_HAS_MS_OS_DESC | |
5e33f6fd RB |
2124 | FUNCTIONFS_VIRTUAL_ADDR | |
2125 | FUNCTIONFS_EVENTFD)) { | |
ac8dde11 | 2126 | ret = -ENOSYS; |
ddf8abd2 MN |
2127 | goto error; |
2128 | } | |
ac8dde11 MN |
2129 | data += 12; |
2130 | len -= 12; | |
2131 | break; | |
2132 | default: | |
2133 | goto error; | |
ddf8abd2 | 2134 | } |
ddf8abd2 | 2135 | |
5e33f6fd RB |
2136 | if (flags & FUNCTIONFS_EVENTFD) { |
2137 | if (len < 4) | |
2138 | goto error; | |
2139 | ffs->ffs_eventfd = | |
2140 | eventfd_ctx_fdget((int)get_unaligned_le32(data)); | |
2141 | if (IS_ERR(ffs->ffs_eventfd)) { | |
2142 | ret = PTR_ERR(ffs->ffs_eventfd); | |
2143 | ffs->ffs_eventfd = NULL; | |
2144 | goto error; | |
2145 | } | |
2146 | data += 4; | |
2147 | len -= 4; | |
2148 | } | |
2149 | ||
ac8dde11 MN |
2150 | /* Read fs_count, hs_count and ss_count (if present) */ |
2151 | for (i = 0; i < 3; ++i) { | |
2152 | if (!(flags & (1 << i))) { | |
2153 | counts[i] = 0; | |
2154 | } else if (len < 4) { | |
8d4e897b | 2155 | goto error; |
ac8dde11 MN |
2156 | } else { |
2157 | counts[i] = get_unaligned_le32(data); | |
2158 | data += 4; | |
2159 | len -= 4; | |
8d4e897b | 2160 | } |
ddf8abd2 | 2161 | } |
f0175ab5 AP |
2162 | if (flags & (1 << i)) { |
2163 | os_descs_count = get_unaligned_le32(data); | |
2164 | data += 4; | |
2165 | len -= 4; | |
2166 | }; | |
ddf8abd2 | 2167 | |
ac8dde11 MN |
2168 | /* Read descriptors */ |
2169 | raw_descs = data; | |
6d5c1c77 | 2170 | helper.ffs = ffs; |
ac8dde11 MN |
2171 | for (i = 0; i < 3; ++i) { |
2172 | if (!counts[i]) | |
2173 | continue; | |
6d5c1c77 RB |
2174 | helper.interfaces_count = 0; |
2175 | helper.eps_count = 0; | |
ac8dde11 | 2176 | ret = ffs_do_descs(counts[i], data, len, |
6d5c1c77 | 2177 | __ffs_data_do_entity, &helper); |
ac8dde11 | 2178 | if (ret < 0) |
ddf8abd2 | 2179 | goto error; |
6d5c1c77 RB |
2180 | if (!ffs->eps_count && !ffs->interfaces_count) { |
2181 | ffs->eps_count = helper.eps_count; | |
2182 | ffs->interfaces_count = helper.interfaces_count; | |
2183 | } else { | |
2184 | if (ffs->eps_count != helper.eps_count) { | |
2185 | ret = -EINVAL; | |
2186 | goto error; | |
2187 | } | |
2188 | if (ffs->interfaces_count != helper.interfaces_count) { | |
2189 | ret = -EINVAL; | |
2190 | goto error; | |
2191 | } | |
2192 | } | |
ac8dde11 MN |
2193 | data += ret; |
2194 | len -= ret; | |
ddf8abd2 | 2195 | } |
f0175ab5 AP |
2196 | if (os_descs_count) { |
2197 | ret = ffs_do_os_descs(os_descs_count, data, len, | |
2198 | __ffs_data_do_os_desc, ffs); | |
2199 | if (ret < 0) | |
2200 | goto error; | |
2201 | data += ret; | |
2202 | len -= ret; | |
2203 | } | |
ddf8abd2 | 2204 | |
ac8dde11 MN |
2205 | if (raw_descs == data || len) { |
2206 | ret = -EINVAL; | |
2207 | goto error; | |
2208 | } | |
ddf8abd2 | 2209 | |
ac8dde11 MN |
2210 | ffs->raw_descs_data = _data; |
2211 | ffs->raw_descs = raw_descs; | |
2212 | ffs->raw_descs_length = data - raw_descs; | |
2213 | ffs->fs_descs_count = counts[0]; | |
2214 | ffs->hs_descs_count = counts[1]; | |
2215 | ffs->ss_descs_count = counts[2]; | |
f0175ab5 | 2216 | ffs->ms_os_descs_count = os_descs_count; |
ddf8abd2 MN |
2217 | |
2218 | return 0; | |
2219 | ||
ddf8abd2 MN |
2220 | error: |
2221 | kfree(_data); | |
2222 | return ret; | |
2223 | } | |
2224 | ||
ddf8abd2 MN |
2225 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
2226 | char *const _data, size_t len) | |
2227 | { | |
2228 | u32 str_count, needed_count, lang_count; | |
2229 | struct usb_gadget_strings **stringtabs, *t; | |
2230 | struct usb_string *strings, *s; | |
2231 | const char *data = _data; | |
2232 | ||
2233 | ENTER(); | |
2234 | ||
2235 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || | |
2236 | get_unaligned_le32(data + 4) != len)) | |
2237 | goto error; | |
2238 | str_count = get_unaligned_le32(data + 8); | |
2239 | lang_count = get_unaligned_le32(data + 12); | |
2240 | ||
2241 | /* if one is zero the other must be zero */ | |
2242 | if (unlikely(!str_count != !lang_count)) | |
2243 | goto error; | |
2244 | ||
2245 | /* Do we have at least as many strings as descriptors need? */ | |
2246 | needed_count = ffs->strings_count; | |
2247 | if (unlikely(str_count < needed_count)) | |
2248 | goto error; | |
2249 | ||
5ab54cf7 MN |
2250 | /* |
2251 | * If we don't need any strings just return and free all | |
2252 | * memory. | |
2253 | */ | |
ddf8abd2 MN |
2254 | if (!needed_count) { |
2255 | kfree(_data); | |
2256 | return 0; | |
2257 | } | |
2258 | ||
5ab54cf7 | 2259 | /* Allocate everything in one chunk so there's less maintenance. */ |
ddf8abd2 | 2260 | { |
ddf8abd2 | 2261 | unsigned i = 0; |
e6f3862f AP |
2262 | vla_group(d); |
2263 | vla_item(d, struct usb_gadget_strings *, stringtabs, | |
2264 | lang_count + 1); | |
2265 | vla_item(d, struct usb_gadget_strings, stringtab, lang_count); | |
2266 | vla_item(d, struct usb_string, strings, | |
2267 | lang_count*(needed_count+1)); | |
ddf8abd2 | 2268 | |
e6f3862f AP |
2269 | char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); |
2270 | ||
2271 | if (unlikely(!vlabuf)) { | |
ddf8abd2 MN |
2272 | kfree(_data); |
2273 | return -ENOMEM; | |
2274 | } | |
2275 | ||
e6f3862f AP |
2276 | /* Initialize the VLA pointers */ |
2277 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2278 | t = vla_ptr(vlabuf, d, stringtab); | |
ddf8abd2 MN |
2279 | i = lang_count; |
2280 | do { | |
2281 | *stringtabs++ = t++; | |
2282 | } while (--i); | |
2283 | *stringtabs = NULL; | |
2284 | ||
e6f3862f AP |
2285 | /* stringtabs = vlabuf = d_stringtabs for later kfree */ |
2286 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2287 | t = vla_ptr(vlabuf, d, stringtab); | |
2288 | s = vla_ptr(vlabuf, d, strings); | |
ddf8abd2 MN |
2289 | strings = s; |
2290 | } | |
2291 | ||
2292 | /* For each language */ | |
2293 | data += 16; | |
2294 | len -= 16; | |
2295 | ||
2296 | do { /* lang_count > 0 so we can use do-while */ | |
2297 | unsigned needed = needed_count; | |
2298 | ||
2299 | if (unlikely(len < 3)) | |
2300 | goto error_free; | |
2301 | t->language = get_unaligned_le16(data); | |
2302 | t->strings = s; | |
2303 | ++t; | |
2304 | ||
2305 | data += 2; | |
2306 | len -= 2; | |
2307 | ||
2308 | /* For each string */ | |
2309 | do { /* str_count > 0 so we can use do-while */ | |
2310 | size_t length = strnlen(data, len); | |
2311 | ||
2312 | if (unlikely(length == len)) | |
2313 | goto error_free; | |
2314 | ||
5ab54cf7 MN |
2315 | /* |
2316 | * User may provide more strings then we need, | |
2317 | * if that's the case we simply ignore the | |
2318 | * rest | |
2319 | */ | |
ddf8abd2 | 2320 | if (likely(needed)) { |
5ab54cf7 MN |
2321 | /* |
2322 | * s->id will be set while adding | |
ddf8abd2 | 2323 | * function to configuration so for |
5ab54cf7 MN |
2324 | * now just leave garbage here. |
2325 | */ | |
ddf8abd2 MN |
2326 | s->s = data; |
2327 | --needed; | |
2328 | ++s; | |
2329 | } | |
2330 | ||
2331 | data += length + 1; | |
2332 | len -= length + 1; | |
2333 | } while (--str_count); | |
2334 | ||
2335 | s->id = 0; /* terminator */ | |
2336 | s->s = NULL; | |
2337 | ++s; | |
2338 | ||
2339 | } while (--lang_count); | |
2340 | ||
2341 | /* Some garbage left? */ | |
2342 | if (unlikely(len)) | |
2343 | goto error_free; | |
2344 | ||
2345 | /* Done! */ | |
2346 | ffs->stringtabs = stringtabs; | |
2347 | ffs->raw_strings = _data; | |
2348 | ||
2349 | return 0; | |
2350 | ||
2351 | error_free: | |
2352 | kfree(stringtabs); | |
2353 | error: | |
2354 | kfree(_data); | |
2355 | return -EINVAL; | |
2356 | } | |
2357 | ||
2358 | ||
ddf8abd2 MN |
2359 | /* Events handling and management *******************************************/ |
2360 | ||
2361 | static void __ffs_event_add(struct ffs_data *ffs, | |
2362 | enum usb_functionfs_event_type type) | |
2363 | { | |
2364 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; | |
2365 | int neg = 0; | |
2366 | ||
5ab54cf7 MN |
2367 | /* |
2368 | * Abort any unhandled setup | |
2369 | * | |
2370 | * We do not need to worry about some cmpxchg() changing value | |
ddf8abd2 MN |
2371 | * of ffs->setup_state without holding the lock because when |
2372 | * state is FFS_SETUP_PENDING cmpxchg() in several places in | |
5ab54cf7 MN |
2373 | * the source does nothing. |
2374 | */ | |
ddf8abd2 | 2375 | if (ffs->setup_state == FFS_SETUP_PENDING) |
e46318a0 | 2376 | ffs->setup_state = FFS_SETUP_CANCELLED; |
ddf8abd2 | 2377 | |
67913bbd MN |
2378 | /* |
2379 | * Logic of this function guarantees that there are at most four pending | |
2380 | * evens on ffs->ev.types queue. This is important because the queue | |
2381 | * has space for four elements only and __ffs_ep0_read_events function | |
2382 | * depends on that limit as well. If more event types are added, those | |
2383 | * limits have to be revisited or guaranteed to still hold. | |
2384 | */ | |
ddf8abd2 MN |
2385 | switch (type) { |
2386 | case FUNCTIONFS_RESUME: | |
2387 | rem_type2 = FUNCTIONFS_SUSPEND; | |
5ab54cf7 | 2388 | /* FALL THROUGH */ |
ddf8abd2 MN |
2389 | case FUNCTIONFS_SUSPEND: |
2390 | case FUNCTIONFS_SETUP: | |
2391 | rem_type1 = type; | |
5ab54cf7 | 2392 | /* Discard all similar events */ |
ddf8abd2 MN |
2393 | break; |
2394 | ||
2395 | case FUNCTIONFS_BIND: | |
2396 | case FUNCTIONFS_UNBIND: | |
2397 | case FUNCTIONFS_DISABLE: | |
2398 | case FUNCTIONFS_ENABLE: | |
5ab54cf7 | 2399 | /* Discard everything other then power management. */ |
ddf8abd2 MN |
2400 | rem_type1 = FUNCTIONFS_SUSPEND; |
2401 | rem_type2 = FUNCTIONFS_RESUME; | |
2402 | neg = 1; | |
2403 | break; | |
2404 | ||
2405 | default: | |
fe00bcbf MN |
2406 | WARN(1, "%d: unknown event, this should not happen\n", type); |
2407 | return; | |
ddf8abd2 MN |
2408 | } |
2409 | ||
2410 | { | |
2411 | u8 *ev = ffs->ev.types, *out = ev; | |
2412 | unsigned n = ffs->ev.count; | |
2413 | for (; n; --n, ++ev) | |
2414 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) | |
2415 | *out++ = *ev; | |
2416 | else | |
aa02f172 | 2417 | pr_vdebug("purging event %d\n", *ev); |
ddf8abd2 MN |
2418 | ffs->ev.count = out - ffs->ev.types; |
2419 | } | |
2420 | ||
aa02f172 | 2421 | pr_vdebug("adding event %d\n", type); |
ddf8abd2 MN |
2422 | ffs->ev.types[ffs->ev.count++] = type; |
2423 | wake_up_locked(&ffs->ev.waitq); | |
5e33f6fd RB |
2424 | if (ffs->ffs_eventfd) |
2425 | eventfd_signal(ffs->ffs_eventfd, 1); | |
ddf8abd2 MN |
2426 | } |
2427 | ||
2428 | static void ffs_event_add(struct ffs_data *ffs, | |
2429 | enum usb_functionfs_event_type type) | |
2430 | { | |
2431 | unsigned long flags; | |
2432 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2433 | __ffs_event_add(ffs, type); | |
2434 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2435 | } | |
2436 | ||
ddf8abd2 MN |
2437 | /* Bind/unbind USB function hooks *******************************************/ |
2438 | ||
6d5c1c77 RB |
2439 | static int ffs_ep_addr2idx(struct ffs_data *ffs, u8 endpoint_address) |
2440 | { | |
2441 | int i; | |
2442 | ||
2443 | for (i = 1; i < ARRAY_SIZE(ffs->eps_addrmap); ++i) | |
2444 | if (ffs->eps_addrmap[i] == endpoint_address) | |
2445 | return i; | |
2446 | return -ENOENT; | |
2447 | } | |
2448 | ||
ddf8abd2 MN |
2449 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, |
2450 | struct usb_descriptor_header *desc, | |
2451 | void *priv) | |
2452 | { | |
2453 | struct usb_endpoint_descriptor *ds = (void *)desc; | |
2454 | struct ffs_function *func = priv; | |
2455 | struct ffs_ep *ffs_ep; | |
85b06f5e DC |
2456 | unsigned ep_desc_id; |
2457 | int idx; | |
8d4e897b | 2458 | static const char *speed_names[] = { "full", "high", "super" }; |
ddf8abd2 MN |
2459 | |
2460 | if (type != FFS_DESCRIPTOR) | |
2461 | return 0; | |
2462 | ||
8d4e897b MG |
2463 | /* |
2464 | * If ss_descriptors is not NULL, we are reading super speed | |
2465 | * descriptors; if hs_descriptors is not NULL, we are reading high | |
2466 | * speed descriptors; otherwise, we are reading full speed | |
2467 | * descriptors. | |
2468 | */ | |
2469 | if (func->function.ss_descriptors) { | |
2470 | ep_desc_id = 2; | |
2471 | func->function.ss_descriptors[(long)valuep] = desc; | |
2472 | } else if (func->function.hs_descriptors) { | |
2473 | ep_desc_id = 1; | |
ddf8abd2 | 2474 | func->function.hs_descriptors[(long)valuep] = desc; |
8d4e897b MG |
2475 | } else { |
2476 | ep_desc_id = 0; | |
10287bae | 2477 | func->function.fs_descriptors[(long)valuep] = desc; |
8d4e897b | 2478 | } |
ddf8abd2 MN |
2479 | |
2480 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) | |
2481 | return 0; | |
2482 | ||
6d5c1c77 RB |
2483 | idx = ffs_ep_addr2idx(func->ffs, ds->bEndpointAddress) - 1; |
2484 | if (idx < 0) | |
2485 | return idx; | |
2486 | ||
ddf8abd2 MN |
2487 | ffs_ep = func->eps + idx; |
2488 | ||
8d4e897b MG |
2489 | if (unlikely(ffs_ep->descs[ep_desc_id])) { |
2490 | pr_err("two %sspeed descriptors for EP %d\n", | |
2491 | speed_names[ep_desc_id], | |
d8df0b61 | 2492 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
ddf8abd2 MN |
2493 | return -EINVAL; |
2494 | } | |
8d4e897b | 2495 | ffs_ep->descs[ep_desc_id] = ds; |
ddf8abd2 MN |
2496 | |
2497 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); | |
2498 | if (ffs_ep->ep) { | |
2499 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; | |
2500 | if (!ds->wMaxPacketSize) | |
2501 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; | |
2502 | } else { | |
2503 | struct usb_request *req; | |
2504 | struct usb_ep *ep; | |
1b0bf88f | 2505 | u8 bEndpointAddress; |
ddf8abd2 | 2506 | |
1b0bf88f RB |
2507 | /* |
2508 | * We back up bEndpointAddress because autoconfig overwrites | |
2509 | * it with physical endpoint address. | |
2510 | */ | |
2511 | bEndpointAddress = ds->bEndpointAddress; | |
aa02f172 | 2512 | pr_vdebug("autoconfig\n"); |
ddf8abd2 MN |
2513 | ep = usb_ep_autoconfig(func->gadget, ds); |
2514 | if (unlikely(!ep)) | |
2515 | return -ENOTSUPP; | |
cc7e6056 | 2516 | ep->driver_data = func->eps + idx; |
ddf8abd2 MN |
2517 | |
2518 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
2519 | if (unlikely(!req)) | |
2520 | return -ENOMEM; | |
2521 | ||
2522 | ffs_ep->ep = ep; | |
2523 | ffs_ep->req = req; | |
2524 | func->eps_revmap[ds->bEndpointAddress & | |
2525 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; | |
1b0bf88f RB |
2526 | /* |
2527 | * If we use virtual address mapping, we restore | |
2528 | * original bEndpointAddress value. | |
2529 | */ | |
2530 | if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) | |
2531 | ds->bEndpointAddress = bEndpointAddress; | |
ddf8abd2 MN |
2532 | } |
2533 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); | |
2534 | ||
2535 | return 0; | |
2536 | } | |
2537 | ||
ddf8abd2 MN |
2538 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, |
2539 | struct usb_descriptor_header *desc, | |
2540 | void *priv) | |
2541 | { | |
2542 | struct ffs_function *func = priv; | |
2543 | unsigned idx; | |
2544 | u8 newValue; | |
2545 | ||
2546 | switch (type) { | |
2547 | default: | |
2548 | case FFS_DESCRIPTOR: | |
2549 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ | |
2550 | return 0; | |
2551 | ||
2552 | case FFS_INTERFACE: | |
2553 | idx = *valuep; | |
2554 | if (func->interfaces_nums[idx] < 0) { | |
2555 | int id = usb_interface_id(func->conf, &func->function); | |
2556 | if (unlikely(id < 0)) | |
2557 | return id; | |
2558 | func->interfaces_nums[idx] = id; | |
2559 | } | |
2560 | newValue = func->interfaces_nums[idx]; | |
2561 | break; | |
2562 | ||
2563 | case FFS_STRING: | |
2564 | /* String' IDs are allocated when fsf_data is bound to cdev */ | |
2565 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; | |
2566 | break; | |
2567 | ||
2568 | case FFS_ENDPOINT: | |
5ab54cf7 MN |
2569 | /* |
2570 | * USB_DT_ENDPOINT are handled in | |
2571 | * __ffs_func_bind_do_descs(). | |
2572 | */ | |
ddf8abd2 MN |
2573 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
2574 | return 0; | |
2575 | ||
2576 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2577 | if (unlikely(!func->eps[idx].ep)) | |
2578 | return -EINVAL; | |
2579 | ||
2580 | { | |
2581 | struct usb_endpoint_descriptor **descs; | |
2582 | descs = func->eps[idx].descs; | |
2583 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; | |
2584 | } | |
2585 | break; | |
2586 | } | |
2587 | ||
aa02f172 | 2588 | pr_vdebug("%02x -> %02x\n", *valuep, newValue); |
ddf8abd2 MN |
2589 | *valuep = newValue; |
2590 | return 0; | |
2591 | } | |
2592 | ||
f0175ab5 AP |
2593 | static int __ffs_func_bind_do_os_desc(enum ffs_os_desc_type type, |
2594 | struct usb_os_desc_header *h, void *data, | |
2595 | unsigned len, void *priv) | |
2596 | { | |
2597 | struct ffs_function *func = priv; | |
2598 | u8 length = 0; | |
2599 | ||
2600 | switch (type) { | |
2601 | case FFS_OS_DESC_EXT_COMPAT: { | |
2602 | struct usb_ext_compat_desc *desc = data; | |
2603 | struct usb_os_desc_table *t; | |
2604 | ||
2605 | t = &func->function.os_desc_table[desc->bFirstInterfaceNumber]; | |
2606 | t->if_id = func->interfaces_nums[desc->bFirstInterfaceNumber]; | |
2607 | memcpy(t->os_desc->ext_compat_id, &desc->CompatibleID, | |
2608 | ARRAY_SIZE(desc->CompatibleID) + | |
2609 | ARRAY_SIZE(desc->SubCompatibleID)); | |
2610 | length = sizeof(*desc); | |
2611 | } | |
2612 | break; | |
2613 | case FFS_OS_DESC_EXT_PROP: { | |
2614 | struct usb_ext_prop_desc *desc = data; | |
2615 | struct usb_os_desc_table *t; | |
2616 | struct usb_os_desc_ext_prop *ext_prop; | |
2617 | char *ext_prop_name; | |
2618 | char *ext_prop_data; | |
2619 | ||
2620 | t = &func->function.os_desc_table[h->interface]; | |
2621 | t->if_id = func->interfaces_nums[h->interface]; | |
2622 | ||
2623 | ext_prop = func->ffs->ms_os_descs_ext_prop_avail; | |
2624 | func->ffs->ms_os_descs_ext_prop_avail += sizeof(*ext_prop); | |
2625 | ||
2626 | ext_prop->type = le32_to_cpu(desc->dwPropertyDataType); | |
2627 | ext_prop->name_len = le16_to_cpu(desc->wPropertyNameLength); | |
2628 | ext_prop->data_len = le32_to_cpu(*(u32 *) | |
2629 | usb_ext_prop_data_len_ptr(data, ext_prop->name_len)); | |
2630 | length = ext_prop->name_len + ext_prop->data_len + 14; | |
2631 | ||
2632 | ext_prop_name = func->ffs->ms_os_descs_ext_prop_name_avail; | |
2633 | func->ffs->ms_os_descs_ext_prop_name_avail += | |
2634 | ext_prop->name_len; | |
2635 | ||
2636 | ext_prop_data = func->ffs->ms_os_descs_ext_prop_data_avail; | |
2637 | func->ffs->ms_os_descs_ext_prop_data_avail += | |
2638 | ext_prop->data_len; | |
2639 | memcpy(ext_prop_data, | |
2640 | usb_ext_prop_data_ptr(data, ext_prop->name_len), | |
2641 | ext_prop->data_len); | |
2642 | /* unicode data reported to the host as "WCHAR"s */ | |
2643 | switch (ext_prop->type) { | |
2644 | case USB_EXT_PROP_UNICODE: | |
2645 | case USB_EXT_PROP_UNICODE_ENV: | |
2646 | case USB_EXT_PROP_UNICODE_LINK: | |
2647 | case USB_EXT_PROP_UNICODE_MULTI: | |
2648 | ext_prop->data_len *= 2; | |
2649 | break; | |
2650 | } | |
2651 | ext_prop->data = ext_prop_data; | |
2652 | ||
2653 | memcpy(ext_prop_name, usb_ext_prop_name_ptr(data), | |
2654 | ext_prop->name_len); | |
2655 | /* property name reported to the host as "WCHAR"s */ | |
2656 | ext_prop->name_len *= 2; | |
2657 | ext_prop->name = ext_prop_name; | |
2658 | ||
2659 | t->os_desc->ext_prop_len += | |
2660 | ext_prop->name_len + ext_prop->data_len + 14; | |
2661 | ++t->os_desc->ext_prop_count; | |
2662 | list_add_tail(&ext_prop->entry, &t->os_desc->ext_prop); | |
2663 | } | |
2664 | break; | |
2665 | default: | |
2666 | pr_vdebug("unknown descriptor: %d\n", type); | |
2667 | } | |
2668 | ||
2669 | return length; | |
2670 | } | |
2671 | ||
5920cda6 AP |
2672 | static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, |
2673 | struct usb_configuration *c) | |
2674 | { | |
2675 | struct ffs_function *func = ffs_func_from_usb(f); | |
2676 | struct f_fs_opts *ffs_opts = | |
2677 | container_of(f->fi, struct f_fs_opts, func_inst); | |
2678 | int ret; | |
2679 | ||
2680 | ENTER(); | |
2681 | ||
2682 | /* | |
2683 | * Legacy gadget triggers binding in functionfs_ready_callback, | |
2684 | * which already uses locking; taking the same lock here would | |
2685 | * cause a deadlock. | |
2686 | * | |
2687 | * Configfs-enabled gadgets however do need ffs_dev_lock. | |
2688 | */ | |
2689 | if (!ffs_opts->no_configfs) | |
2690 | ffs_dev_lock(); | |
2691 | ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; | |
2692 | func->ffs = ffs_opts->dev->ffs_data; | |
2693 | if (!ffs_opts->no_configfs) | |
2694 | ffs_dev_unlock(); | |
2695 | if (ret) | |
2696 | return ERR_PTR(ret); | |
2697 | ||
2698 | func->conf = c; | |
2699 | func->gadget = c->cdev->gadget; | |
2700 | ||
5920cda6 AP |
2701 | /* |
2702 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
2703 | * configurations are bound in sequence with list_for_each_entry, | |
2704 | * in each configuration its functions are bound in sequence | |
2705 | * with list_for_each_entry, so we assume no race condition | |
2706 | * with regard to ffs_opts->bound access | |
2707 | */ | |
2708 | if (!ffs_opts->refcnt) { | |
2709 | ret = functionfs_bind(func->ffs, c->cdev); | |
2710 | if (ret) | |
2711 | return ERR_PTR(ret); | |
2712 | } | |
2713 | ffs_opts->refcnt++; | |
2714 | func->function.strings = func->ffs->stringtabs; | |
2715 | ||
2716 | return ffs_opts; | |
2717 | } | |
5920cda6 AP |
2718 | |
2719 | static int _ffs_func_bind(struct usb_configuration *c, | |
2720 | struct usb_function *f) | |
ddf8abd2 MN |
2721 | { |
2722 | struct ffs_function *func = ffs_func_from_usb(f); | |
2723 | struct ffs_data *ffs = func->ffs; | |
2724 | ||
2725 | const int full = !!func->ffs->fs_descs_count; | |
2726 | const int high = gadget_is_dualspeed(func->gadget) && | |
2727 | func->ffs->hs_descs_count; | |
8d4e897b MG |
2728 | const int super = gadget_is_superspeed(func->gadget) && |
2729 | func->ffs->ss_descs_count; | |
ddf8abd2 | 2730 | |
f0175ab5 | 2731 | int fs_len, hs_len, ss_len, ret, i; |
ddf8abd2 MN |
2732 | |
2733 | /* Make it a single chunk, less management later on */ | |
e6f3862f AP |
2734 | vla_group(d); |
2735 | vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); | |
2736 | vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, | |
2737 | full ? ffs->fs_descs_count + 1 : 0); | |
2738 | vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, | |
2739 | high ? ffs->hs_descs_count + 1 : 0); | |
8d4e897b MG |
2740 | vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, |
2741 | super ? ffs->ss_descs_count + 1 : 0); | |
e6f3862f | 2742 | vla_item_with_sz(d, short, inums, ffs->interfaces_count); |
f0175ab5 AP |
2743 | vla_item_with_sz(d, struct usb_os_desc_table, os_desc_table, |
2744 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2745 | vla_item_with_sz(d, char[16], ext_compat, | |
2746 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2747 | vla_item_with_sz(d, struct usb_os_desc, os_desc, | |
2748 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2749 | vla_item_with_sz(d, struct usb_os_desc_ext_prop, ext_prop, | |
2750 | ffs->ms_os_descs_ext_prop_count); | |
2751 | vla_item_with_sz(d, char, ext_prop_name, | |
2752 | ffs->ms_os_descs_ext_prop_name_len); | |
2753 | vla_item_with_sz(d, char, ext_prop_data, | |
2754 | ffs->ms_os_descs_ext_prop_data_len); | |
ac8dde11 | 2755 | vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); |
e6f3862f | 2756 | char *vlabuf; |
ddf8abd2 MN |
2757 | |
2758 | ENTER(); | |
2759 | ||
8d4e897b MG |
2760 | /* Has descriptors only for speeds gadget does not support */ |
2761 | if (unlikely(!(full | high | super))) | |
ddf8abd2 MN |
2762 | return -ENOTSUPP; |
2763 | ||
e6f3862f | 2764 | /* Allocate a single chunk, less management later on */ |
f0175ab5 | 2765 | vlabuf = kzalloc(vla_group_size(d), GFP_KERNEL); |
e6f3862f | 2766 | if (unlikely(!vlabuf)) |
ddf8abd2 MN |
2767 | return -ENOMEM; |
2768 | ||
f0175ab5 AP |
2769 | ffs->ms_os_descs_ext_prop_avail = vla_ptr(vlabuf, d, ext_prop); |
2770 | ffs->ms_os_descs_ext_prop_name_avail = | |
2771 | vla_ptr(vlabuf, d, ext_prop_name); | |
2772 | ffs->ms_os_descs_ext_prop_data_avail = | |
2773 | vla_ptr(vlabuf, d, ext_prop_data); | |
2774 | ||
ac8dde11 MN |
2775 | /* Copy descriptors */ |
2776 | memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, | |
2777 | ffs->raw_descs_length); | |
8d4e897b | 2778 | |
e6f3862f AP |
2779 | memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); |
2780 | for (ret = ffs->eps_count; ret; --ret) { | |
2781 | struct ffs_ep *ptr; | |
2782 | ||
2783 | ptr = vla_ptr(vlabuf, d, eps); | |
2784 | ptr[ret].num = -1; | |
2785 | } | |
ddf8abd2 | 2786 | |
e6f3862f AP |
2787 | /* Save pointers |
2788 | * d_eps == vlabuf, func->eps used to kfree vlabuf later | |
2789 | */ | |
2790 | func->eps = vla_ptr(vlabuf, d, eps); | |
2791 | func->interfaces_nums = vla_ptr(vlabuf, d, inums); | |
ddf8abd2 | 2792 | |
5ab54cf7 MN |
2793 | /* |
2794 | * Go through all the endpoint descriptors and allocate | |
ddf8abd2 | 2795 | * endpoints first, so that later we can rewrite the endpoint |
5ab54cf7 MN |
2796 | * numbers without worrying that it may be described later on. |
2797 | */ | |
ddf8abd2 | 2798 | if (likely(full)) { |
e6f3862f | 2799 | func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); |
8d4e897b MG |
2800 | fs_len = ffs_do_descs(ffs->fs_descs_count, |
2801 | vla_ptr(vlabuf, d, raw_descs), | |
2802 | d_raw_descs__sz, | |
2803 | __ffs_func_bind_do_descs, func); | |
2804 | if (unlikely(fs_len < 0)) { | |
2805 | ret = fs_len; | |
ddf8abd2 | 2806 | goto error; |
8d4e897b | 2807 | } |
ddf8abd2 | 2808 | } else { |
8d4e897b | 2809 | fs_len = 0; |
ddf8abd2 MN |
2810 | } |
2811 | ||
2812 | if (likely(high)) { | |
e6f3862f | 2813 | func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); |
8d4e897b MG |
2814 | hs_len = ffs_do_descs(ffs->hs_descs_count, |
2815 | vla_ptr(vlabuf, d, raw_descs) + fs_len, | |
2816 | d_raw_descs__sz - fs_len, | |
2817 | __ffs_func_bind_do_descs, func); | |
2818 | if (unlikely(hs_len < 0)) { | |
2819 | ret = hs_len; | |
2820 | goto error; | |
2821 | } | |
2822 | } else { | |
2823 | hs_len = 0; | |
2824 | } | |
2825 | ||
2826 | if (likely(super)) { | |
2827 | func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); | |
f0175ab5 | 2828 | ss_len = ffs_do_descs(ffs->ss_descs_count, |
8d4e897b MG |
2829 | vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, |
2830 | d_raw_descs__sz - fs_len - hs_len, | |
2831 | __ffs_func_bind_do_descs, func); | |
f0175ab5 AP |
2832 | if (unlikely(ss_len < 0)) { |
2833 | ret = ss_len; | |
8854894c | 2834 | goto error; |
f0175ab5 AP |
2835 | } |
2836 | } else { | |
2837 | ss_len = 0; | |
ddf8abd2 MN |
2838 | } |
2839 | ||
5ab54cf7 MN |
2840 | /* |
2841 | * Now handle interface numbers allocation and interface and | |
2842 | * endpoint numbers rewriting. We can do that in one go | |
2843 | * now. | |
2844 | */ | |
ddf8abd2 | 2845 | ret = ffs_do_descs(ffs->fs_descs_count + |
8d4e897b MG |
2846 | (high ? ffs->hs_descs_count : 0) + |
2847 | (super ? ffs->ss_descs_count : 0), | |
e6f3862f | 2848 | vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, |
ddf8abd2 MN |
2849 | __ffs_func_bind_do_nums, func); |
2850 | if (unlikely(ret < 0)) | |
2851 | goto error; | |
2852 | ||
f0175ab5 AP |
2853 | func->function.os_desc_table = vla_ptr(vlabuf, d, os_desc_table); |
2854 | if (c->cdev->use_os_string) | |
2855 | for (i = 0; i < ffs->interfaces_count; ++i) { | |
2856 | struct usb_os_desc *desc; | |
2857 | ||
2858 | desc = func->function.os_desc_table[i].os_desc = | |
2859 | vla_ptr(vlabuf, d, os_desc) + | |
2860 | i * sizeof(struct usb_os_desc); | |
2861 | desc->ext_compat_id = | |
2862 | vla_ptr(vlabuf, d, ext_compat) + i * 16; | |
2863 | INIT_LIST_HEAD(&desc->ext_prop); | |
2864 | } | |
2865 | ret = ffs_do_os_descs(ffs->ms_os_descs_count, | |
2866 | vla_ptr(vlabuf, d, raw_descs) + | |
2867 | fs_len + hs_len + ss_len, | |
2868 | d_raw_descs__sz - fs_len - hs_len - ss_len, | |
2869 | __ffs_func_bind_do_os_desc, func); | |
2870 | if (unlikely(ret < 0)) | |
2871 | goto error; | |
2872 | func->function.os_desc_n = | |
2873 | c->cdev->use_os_string ? ffs->interfaces_count : 0; | |
2874 | ||
ddf8abd2 MN |
2875 | /* And we're done */ |
2876 | ffs_event_add(ffs, FUNCTIONFS_BIND); | |
2877 | return 0; | |
2878 | ||
2879 | error: | |
2880 | /* XXX Do we need to release all claimed endpoints here? */ | |
2881 | return ret; | |
2882 | } | |
2883 | ||
5920cda6 AP |
2884 | static int ffs_func_bind(struct usb_configuration *c, |
2885 | struct usb_function *f) | |
2886 | { | |
5920cda6 | 2887 | struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); |
55d81121 RB |
2888 | struct ffs_function *func = ffs_func_from_usb(f); |
2889 | int ret; | |
5920cda6 AP |
2890 | |
2891 | if (IS_ERR(ffs_opts)) | |
2892 | return PTR_ERR(ffs_opts); | |
5920cda6 | 2893 | |
55d81121 RB |
2894 | ret = _ffs_func_bind(c, f); |
2895 | if (ret && !--ffs_opts->refcnt) | |
2896 | functionfs_unbind(func->ffs); | |
2897 | ||
2898 | return ret; | |
5920cda6 AP |
2899 | } |
2900 | ||
ddf8abd2 MN |
2901 | |
2902 | /* Other USB function hooks *************************************************/ | |
2903 | ||
18d6b32f RB |
2904 | static void ffs_reset_work(struct work_struct *work) |
2905 | { | |
2906 | struct ffs_data *ffs = container_of(work, | |
2907 | struct ffs_data, reset_work); | |
2908 | ffs_data_reset(ffs); | |
2909 | } | |
2910 | ||
ddf8abd2 MN |
2911 | static int ffs_func_set_alt(struct usb_function *f, |
2912 | unsigned interface, unsigned alt) | |
2913 | { | |
2914 | struct ffs_function *func = ffs_func_from_usb(f); | |
2915 | struct ffs_data *ffs = func->ffs; | |
2916 | int ret = 0, intf; | |
2917 | ||
2918 | if (alt != (unsigned)-1) { | |
2919 | intf = ffs_func_revmap_intf(func, interface); | |
2920 | if (unlikely(intf < 0)) | |
2921 | return intf; | |
2922 | } | |
2923 | ||
2924 | if (ffs->func) | |
2925 | ffs_func_eps_disable(ffs->func); | |
2926 | ||
18d6b32f RB |
2927 | if (ffs->state == FFS_DEACTIVATED) { |
2928 | ffs->state = FFS_CLOSING; | |
2929 | INIT_WORK(&ffs->reset_work, ffs_reset_work); | |
2930 | schedule_work(&ffs->reset_work); | |
2931 | return -ENODEV; | |
2932 | } | |
2933 | ||
ddf8abd2 MN |
2934 | if (ffs->state != FFS_ACTIVE) |
2935 | return -ENODEV; | |
2936 | ||
2937 | if (alt == (unsigned)-1) { | |
2938 | ffs->func = NULL; | |
2939 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); | |
2940 | return 0; | |
2941 | } | |
2942 | ||
2943 | ffs->func = func; | |
2944 | ret = ffs_func_eps_enable(func); | |
2945 | if (likely(ret >= 0)) | |
2946 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); | |
2947 | return ret; | |
2948 | } | |
2949 | ||
2950 | static void ffs_func_disable(struct usb_function *f) | |
2951 | { | |
2952 | ffs_func_set_alt(f, 0, (unsigned)-1); | |
2953 | } | |
2954 | ||
2955 | static int ffs_func_setup(struct usb_function *f, | |
2956 | const struct usb_ctrlrequest *creq) | |
2957 | { | |
2958 | struct ffs_function *func = ffs_func_from_usb(f); | |
2959 | struct ffs_data *ffs = func->ffs; | |
2960 | unsigned long flags; | |
2961 | int ret; | |
2962 | ||
2963 | ENTER(); | |
2964 | ||
aa02f172 MN |
2965 | pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); |
2966 | pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); | |
2967 | pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); | |
2968 | pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); | |
2969 | pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); | |
ddf8abd2 | 2970 | |
5ab54cf7 MN |
2971 | /* |
2972 | * Most requests directed to interface go through here | |
ddf8abd2 MN |
2973 | * (notable exceptions are set/get interface) so we need to |
2974 | * handle them. All other either handled by composite or | |
2975 | * passed to usb_configuration->setup() (if one is set). No | |
2976 | * matter, we will handle requests directed to endpoint here | |
2977 | * as well (as it's straightforward) but what to do with any | |
5ab54cf7 MN |
2978 | * other request? |
2979 | */ | |
ddf8abd2 MN |
2980 | if (ffs->state != FFS_ACTIVE) |
2981 | return -ENODEV; | |
2982 | ||
2983 | switch (creq->bRequestType & USB_RECIP_MASK) { | |
2984 | case USB_RECIP_INTERFACE: | |
2985 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); | |
2986 | if (unlikely(ret < 0)) | |
2987 | return ret; | |
2988 | break; | |
2989 | ||
2990 | case USB_RECIP_ENDPOINT: | |
2991 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); | |
2992 | if (unlikely(ret < 0)) | |
2993 | return ret; | |
1b0bf88f RB |
2994 | if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) |
2995 | ret = func->ffs->eps_addrmap[ret]; | |
ddf8abd2 MN |
2996 | break; |
2997 | ||
2998 | default: | |
2999 | return -EOPNOTSUPP; | |
3000 | } | |
3001 | ||
3002 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
3003 | ffs->ev.setup = *creq; | |
3004 | ffs->ev.setup.wIndex = cpu_to_le16(ret); | |
3005 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); | |
3006 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
3007 | ||
3008 | return 0; | |
3009 | } | |
3010 | ||
3011 | static void ffs_func_suspend(struct usb_function *f) | |
3012 | { | |
3013 | ENTER(); | |
3014 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); | |
3015 | } | |
3016 | ||
3017 | static void ffs_func_resume(struct usb_function *f) | |
3018 | { | |
3019 | ENTER(); | |
3020 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); | |
3021 | } | |
3022 | ||
3023 | ||
5ab54cf7 | 3024 | /* Endpoint and interface numbers reverse mapping ***************************/ |
ddf8abd2 MN |
3025 | |
3026 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) | |
3027 | { | |
3028 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; | |
3029 | return num ? num : -EDOM; | |
3030 | } | |
3031 | ||
3032 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) | |
3033 | { | |
3034 | short *nums = func->interfaces_nums; | |
3035 | unsigned count = func->ffs->interfaces_count; | |
3036 | ||
3037 | for (; count; --count, ++nums) { | |
3038 | if (*nums >= 0 && *nums == intf) | |
3039 | return nums - func->interfaces_nums; | |
3040 | } | |
3041 | ||
3042 | return -EDOM; | |
3043 | } | |
3044 | ||
3045 | ||
4b187fce AP |
3046 | /* Devices management *******************************************************/ |
3047 | ||
3048 | static LIST_HEAD(ffs_devices); | |
3049 | ||
da13a773 | 3050 | static struct ffs_dev *_ffs_do_find_dev(const char *name) |
4b187fce AP |
3051 | { |
3052 | struct ffs_dev *dev; | |
3053 | ||
3054 | list_for_each_entry(dev, &ffs_devices, entry) { | |
3055 | if (!dev->name || !name) | |
3056 | continue; | |
3057 | if (strcmp(dev->name, name) == 0) | |
3058 | return dev; | |
3059 | } | |
b658499f | 3060 | |
4b187fce AP |
3061 | return NULL; |
3062 | } | |
3063 | ||
3064 | /* | |
3065 | * ffs_lock must be taken by the caller of this function | |
3066 | */ | |
da13a773 | 3067 | static struct ffs_dev *_ffs_get_single_dev(void) |
4b187fce AP |
3068 | { |
3069 | struct ffs_dev *dev; | |
3070 | ||
3071 | if (list_is_singular(&ffs_devices)) { | |
3072 | dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); | |
3073 | if (dev->single) | |
3074 | return dev; | |
3075 | } | |
3076 | ||
3077 | return NULL; | |
3078 | } | |
3079 | ||
3080 | /* | |
3081 | * ffs_lock must be taken by the caller of this function | |
3082 | */ | |
da13a773 | 3083 | static struct ffs_dev *_ffs_find_dev(const char *name) |
4b187fce AP |
3084 | { |
3085 | struct ffs_dev *dev; | |
3086 | ||
da13a773 | 3087 | dev = _ffs_get_single_dev(); |
4b187fce AP |
3088 | if (dev) |
3089 | return dev; | |
3090 | ||
da13a773 | 3091 | return _ffs_do_find_dev(name); |
4b187fce AP |
3092 | } |
3093 | ||
b658499f AP |
3094 | /* Configfs support *********************************************************/ |
3095 | ||
3096 | static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) | |
3097 | { | |
3098 | return container_of(to_config_group(item), struct f_fs_opts, | |
3099 | func_inst.group); | |
3100 | } | |
3101 | ||
3102 | static void ffs_attr_release(struct config_item *item) | |
3103 | { | |
3104 | struct f_fs_opts *opts = to_ffs_opts(item); | |
3105 | ||
3106 | usb_put_function_instance(&opts->func_inst); | |
3107 | } | |
3108 | ||
3109 | static struct configfs_item_operations ffs_item_ops = { | |
3110 | .release = ffs_attr_release, | |
3111 | }; | |
3112 | ||
3113 | static struct config_item_type ffs_func_type = { | |
3114 | .ct_item_ops = &ffs_item_ops, | |
3115 | .ct_owner = THIS_MODULE, | |
3116 | }; | |
3117 | ||
3118 | ||
5920cda6 AP |
3119 | /* Function registration interface ******************************************/ |
3120 | ||
5920cda6 AP |
3121 | static void ffs_free_inst(struct usb_function_instance *f) |
3122 | { | |
3123 | struct f_fs_opts *opts; | |
3124 | ||
3125 | opts = to_f_fs_opts(f); | |
3126 | ffs_dev_lock(); | |
da13a773 | 3127 | _ffs_free_dev(opts->dev); |
5920cda6 AP |
3128 | ffs_dev_unlock(); |
3129 | kfree(opts); | |
3130 | } | |
3131 | ||
b658499f AP |
3132 | #define MAX_INST_NAME_LEN 40 |
3133 | ||
3134 | static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) | |
3135 | { | |
3136 | struct f_fs_opts *opts; | |
3137 | char *ptr; | |
3138 | const char *tmp; | |
3139 | int name_len, ret; | |
3140 | ||
3141 | name_len = strlen(name) + 1; | |
3142 | if (name_len > MAX_INST_NAME_LEN) | |
3143 | return -ENAMETOOLONG; | |
3144 | ||
3145 | ptr = kstrndup(name, name_len, GFP_KERNEL); | |
3146 | if (!ptr) | |
3147 | return -ENOMEM; | |
3148 | ||
3149 | opts = to_f_fs_opts(fi); | |
3150 | tmp = NULL; | |
3151 | ||
3152 | ffs_dev_lock(); | |
3153 | ||
3154 | tmp = opts->dev->name_allocated ? opts->dev->name : NULL; | |
3155 | ret = _ffs_name_dev(opts->dev, ptr); | |
3156 | if (ret) { | |
3157 | kfree(ptr); | |
3158 | ffs_dev_unlock(); | |
3159 | return ret; | |
3160 | } | |
3161 | opts->dev->name_allocated = true; | |
3162 | ||
3163 | ffs_dev_unlock(); | |
3164 | ||
3165 | kfree(tmp); | |
3166 | ||
3167 | return 0; | |
3168 | } | |
3169 | ||
5920cda6 AP |
3170 | static struct usb_function_instance *ffs_alloc_inst(void) |
3171 | { | |
3172 | struct f_fs_opts *opts; | |
3173 | struct ffs_dev *dev; | |
3174 | ||
3175 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3176 | if (!opts) | |
3177 | return ERR_PTR(-ENOMEM); | |
3178 | ||
b658499f | 3179 | opts->func_inst.set_inst_name = ffs_set_inst_name; |
5920cda6 AP |
3180 | opts->func_inst.free_func_inst = ffs_free_inst; |
3181 | ffs_dev_lock(); | |
da13a773 | 3182 | dev = _ffs_alloc_dev(); |
5920cda6 AP |
3183 | ffs_dev_unlock(); |
3184 | if (IS_ERR(dev)) { | |
3185 | kfree(opts); | |
3186 | return ERR_CAST(dev); | |
3187 | } | |
3188 | opts->dev = dev; | |
b658499f | 3189 | dev->opts = opts; |
5920cda6 | 3190 | |
b658499f AP |
3191 | config_group_init_type_name(&opts->func_inst.group, "", |
3192 | &ffs_func_type); | |
5920cda6 AP |
3193 | return &opts->func_inst; |
3194 | } | |
3195 | ||
3196 | static void ffs_free(struct usb_function *f) | |
3197 | { | |
3198 | kfree(ffs_func_from_usb(f)); | |
3199 | } | |
3200 | ||
3201 | static void ffs_func_unbind(struct usb_configuration *c, | |
3202 | struct usb_function *f) | |
3203 | { | |
3204 | struct ffs_function *func = ffs_func_from_usb(f); | |
3205 | struct ffs_data *ffs = func->ffs; | |
3206 | struct f_fs_opts *opts = | |
3207 | container_of(f->fi, struct f_fs_opts, func_inst); | |
3208 | struct ffs_ep *ep = func->eps; | |
3209 | unsigned count = ffs->eps_count; | |
3210 | unsigned long flags; | |
3211 | ||
3212 | ENTER(); | |
3213 | if (ffs->func == func) { | |
3214 | ffs_func_eps_disable(func); | |
3215 | ffs->func = NULL; | |
3216 | } | |
3217 | ||
3218 | if (!--opts->refcnt) | |
3219 | functionfs_unbind(ffs); | |
3220 | ||
3221 | /* cleanup after autoconfig */ | |
3222 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
3223 | do { | |
3224 | if (ep->ep && ep->req) | |
3225 | usb_ep_free_request(ep->ep, ep->req); | |
3226 | ep->req = NULL; | |
3227 | ++ep; | |
3228 | } while (--count); | |
3229 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
3230 | kfree(func->eps); | |
3231 | func->eps = NULL; | |
3232 | /* | |
3233 | * eps, descriptors and interfaces_nums are allocated in the | |
3234 | * same chunk so only one free is required. | |
3235 | */ | |
3236 | func->function.fs_descriptors = NULL; | |
3237 | func->function.hs_descriptors = NULL; | |
8d4e897b | 3238 | func->function.ss_descriptors = NULL; |
5920cda6 AP |
3239 | func->interfaces_nums = NULL; |
3240 | ||
3241 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); | |
3242 | } | |
3243 | ||
3244 | static struct usb_function *ffs_alloc(struct usb_function_instance *fi) | |
3245 | { | |
3246 | struct ffs_function *func; | |
3247 | ||
3248 | ENTER(); | |
3249 | ||
3250 | func = kzalloc(sizeof(*func), GFP_KERNEL); | |
3251 | if (unlikely(!func)) | |
3252 | return ERR_PTR(-ENOMEM); | |
3253 | ||
3254 | func->function.name = "Function FS Gadget"; | |
3255 | ||
3256 | func->function.bind = ffs_func_bind; | |
3257 | func->function.unbind = ffs_func_unbind; | |
3258 | func->function.set_alt = ffs_func_set_alt; | |
3259 | func->function.disable = ffs_func_disable; | |
3260 | func->function.setup = ffs_func_setup; | |
3261 | func->function.suspend = ffs_func_suspend; | |
3262 | func->function.resume = ffs_func_resume; | |
3263 | func->function.free_func = ffs_free; | |
3264 | ||
3265 | return &func->function; | |
3266 | } | |
3267 | ||
4b187fce AP |
3268 | /* |
3269 | * ffs_lock must be taken by the caller of this function | |
3270 | */ | |
da13a773 | 3271 | static struct ffs_dev *_ffs_alloc_dev(void) |
4b187fce AP |
3272 | { |
3273 | struct ffs_dev *dev; | |
3274 | int ret; | |
3275 | ||
da13a773 | 3276 | if (_ffs_get_single_dev()) |
4b187fce AP |
3277 | return ERR_PTR(-EBUSY); |
3278 | ||
3279 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
3280 | if (!dev) | |
3281 | return ERR_PTR(-ENOMEM); | |
3282 | ||
3283 | if (list_empty(&ffs_devices)) { | |
3284 | ret = functionfs_init(); | |
3285 | if (ret) { | |
3286 | kfree(dev); | |
3287 | return ERR_PTR(ret); | |
3288 | } | |
3289 | } | |
3290 | ||
3291 | list_add(&dev->entry, &ffs_devices); | |
3292 | ||
3293 | return dev; | |
3294 | } | |
3295 | ||
3296 | /* | |
3297 | * ffs_lock must be taken by the caller of this function | |
3298 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3299 | */ | |
3300 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3301 | { | |
3302 | struct ffs_dev *existing; | |
3303 | ||
da13a773 | 3304 | existing = _ffs_do_find_dev(name); |
4b187fce AP |
3305 | if (existing) |
3306 | return -EBUSY; | |
ab13cb0c | 3307 | |
4b187fce AP |
3308 | dev->name = name; |
3309 | ||
3310 | return 0; | |
3311 | } | |
3312 | ||
3313 | /* | |
3314 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3315 | */ | |
3316 | int ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3317 | { | |
3318 | int ret; | |
3319 | ||
3320 | ffs_dev_lock(); | |
3321 | ret = _ffs_name_dev(dev, name); | |
3322 | ffs_dev_unlock(); | |
3323 | ||
3324 | return ret; | |
3325 | } | |
0700faaf | 3326 | EXPORT_SYMBOL_GPL(ffs_name_dev); |
4b187fce AP |
3327 | |
3328 | int ffs_single_dev(struct ffs_dev *dev) | |
3329 | { | |
3330 | int ret; | |
3331 | ||
3332 | ret = 0; | |
3333 | ffs_dev_lock(); | |
3334 | ||
3335 | if (!list_is_singular(&ffs_devices)) | |
3336 | ret = -EBUSY; | |
3337 | else | |
3338 | dev->single = true; | |
3339 | ||
3340 | ffs_dev_unlock(); | |
3341 | return ret; | |
3342 | } | |
0700faaf | 3343 | EXPORT_SYMBOL_GPL(ffs_single_dev); |
4b187fce AP |
3344 | |
3345 | /* | |
3346 | * ffs_lock must be taken by the caller of this function | |
3347 | */ | |
da13a773 | 3348 | static void _ffs_free_dev(struct ffs_dev *dev) |
4b187fce AP |
3349 | { |
3350 | list_del(&dev->entry); | |
b658499f AP |
3351 | if (dev->name_allocated) |
3352 | kfree(dev->name); | |
4b187fce AP |
3353 | kfree(dev); |
3354 | if (list_empty(&ffs_devices)) | |
3355 | functionfs_cleanup(); | |
3356 | } | |
3357 | ||
3358 | static void *ffs_acquire_dev(const char *dev_name) | |
3359 | { | |
3360 | struct ffs_dev *ffs_dev; | |
3361 | ||
3362 | ENTER(); | |
3363 | ffs_dev_lock(); | |
3364 | ||
da13a773 | 3365 | ffs_dev = _ffs_find_dev(dev_name); |
4b187fce | 3366 | if (!ffs_dev) |
d668b4f3 | 3367 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3368 | else if (ffs_dev->mounted) |
3369 | ffs_dev = ERR_PTR(-EBUSY); | |
5920cda6 AP |
3370 | else if (ffs_dev->ffs_acquire_dev_callback && |
3371 | ffs_dev->ffs_acquire_dev_callback(ffs_dev)) | |
d668b4f3 | 3372 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3373 | else |
3374 | ffs_dev->mounted = true; | |
3375 | ||
3376 | ffs_dev_unlock(); | |
3377 | return ffs_dev; | |
3378 | } | |
3379 | ||
3380 | static void ffs_release_dev(struct ffs_data *ffs_data) | |
3381 | { | |
3382 | struct ffs_dev *ffs_dev; | |
3383 | ||
3384 | ENTER(); | |
3385 | ffs_dev_lock(); | |
3386 | ||
3387 | ffs_dev = ffs_data->private_data; | |
ea365922 | 3388 | if (ffs_dev) { |
4b187fce | 3389 | ffs_dev->mounted = false; |
ea365922 AP |
3390 | |
3391 | if (ffs_dev->ffs_release_dev_callback) | |
3392 | ffs_dev->ffs_release_dev_callback(ffs_dev); | |
3393 | } | |
4b187fce AP |
3394 | |
3395 | ffs_dev_unlock(); | |
3396 | } | |
3397 | ||
3398 | static int ffs_ready(struct ffs_data *ffs) | |
3399 | { | |
3400 | struct ffs_dev *ffs_obj; | |
3401 | int ret = 0; | |
3402 | ||
3403 | ENTER(); | |
3404 | ffs_dev_lock(); | |
3405 | ||
3406 | ffs_obj = ffs->private_data; | |
3407 | if (!ffs_obj) { | |
3408 | ret = -EINVAL; | |
3409 | goto done; | |
3410 | } | |
3411 | if (WARN_ON(ffs_obj->desc_ready)) { | |
3412 | ret = -EBUSY; | |
3413 | goto done; | |
3414 | } | |
3415 | ||
3416 | ffs_obj->desc_ready = true; | |
3417 | ffs_obj->ffs_data = ffs; | |
3418 | ||
49a79d8b | 3419 | if (ffs_obj->ffs_ready_callback) { |
4b187fce | 3420 | ret = ffs_obj->ffs_ready_callback(ffs); |
49a79d8b KO |
3421 | if (ret) |
3422 | goto done; | |
3423 | } | |
4b187fce | 3424 | |
49a79d8b | 3425 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); |
4b187fce AP |
3426 | done: |
3427 | ffs_dev_unlock(); | |
3428 | return ret; | |
3429 | } | |
3430 | ||
3431 | static void ffs_closed(struct ffs_data *ffs) | |
3432 | { | |
3433 | struct ffs_dev *ffs_obj; | |
f14e9ad1 | 3434 | struct f_fs_opts *opts; |
4b187fce AP |
3435 | |
3436 | ENTER(); | |
3437 | ffs_dev_lock(); | |
3438 | ||
3439 | ffs_obj = ffs->private_data; | |
3440 | if (!ffs_obj) | |
3441 | goto done; | |
3442 | ||
3443 | ffs_obj->desc_ready = false; | |
3444 | ||
49a79d8b KO |
3445 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags) && |
3446 | ffs_obj->ffs_closed_callback) | |
4b187fce | 3447 | ffs_obj->ffs_closed_callback(ffs); |
b658499f | 3448 | |
f14e9ad1 RMS |
3449 | if (ffs_obj->opts) |
3450 | opts = ffs_obj->opts; | |
3451 | else | |
3452 | goto done; | |
3453 | ||
3454 | if (opts->no_configfs || !opts->func_inst.group.cg_item.ci_parent | |
3455 | || !atomic_read(&opts->func_inst.group.cg_item.ci_kref.refcount)) | |
b658499f AP |
3456 | goto done; |
3457 | ||
3458 | unregister_gadget_item(ffs_obj->opts-> | |
3459 | func_inst.group.cg_item.ci_parent->ci_parent); | |
4b187fce AP |
3460 | done: |
3461 | ffs_dev_unlock(); | |
3462 | } | |
3463 | ||
ddf8abd2 MN |
3464 | /* Misc helper functions ****************************************************/ |
3465 | ||
3466 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
3467 | { | |
3468 | return nonblock | |
3469 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN | |
3470 | : mutex_lock_interruptible(mutex); | |
3471 | } | |
3472 | ||
260ef311 | 3473 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
3474 | { |
3475 | char *data; | |
3476 | ||
3477 | if (unlikely(!len)) | |
3478 | return NULL; | |
3479 | ||
3480 | data = kmalloc(len, GFP_KERNEL); | |
3481 | if (unlikely(!data)) | |
3482 | return ERR_PTR(-ENOMEM); | |
3483 | ||
7fe9a937 | 3484 | if (unlikely(copy_from_user(data, buf, len))) { |
ddf8abd2 MN |
3485 | kfree(data); |
3486 | return ERR_PTR(-EFAULT); | |
3487 | } | |
3488 | ||
aa02f172 | 3489 | pr_vdebug("Buffer from user space:\n"); |
ddf8abd2 MN |
3490 | ffs_dump_mem("", data, len); |
3491 | ||
3492 | return data; | |
3493 | } | |
5920cda6 | 3494 | |
5920cda6 AP |
3495 | DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc); |
3496 | MODULE_LICENSE("GPL"); | |
3497 | MODULE_AUTHOR("Michal Nazarewicz"); |