]>
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> |
174cd4b1 | 26 | #include <linux/sched/signal.h> |
e2e40f2c | 27 | #include <linux/uio.h> |
ddf8abd2 | 28 | #include <asm/unaligned.h> |
ddf8abd2 MN |
29 | |
30 | #include <linux/usb/composite.h> | |
31 | #include <linux/usb/functionfs.h> | |
32 | ||
2e4c7553 RB |
33 | #include <linux/aio.h> |
34 | #include <linux/mmu_context.h> | |
23de91e9 | 35 | #include <linux/poll.h> |
5e33f6fd | 36 | #include <linux/eventfd.h> |
23de91e9 | 37 | |
e72c39c0 | 38 | #include "u_fs.h" |
74d48466 | 39 | #include "u_f.h" |
f0175ab5 | 40 | #include "u_os_desc.h" |
b658499f | 41 | #include "configfs.h" |
ddf8abd2 MN |
42 | |
43 | #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ | |
44 | ||
ddf8abd2 MN |
45 | /* Reference counter handling */ |
46 | static void ffs_data_get(struct ffs_data *ffs); | |
47 | static void ffs_data_put(struct ffs_data *ffs); | |
48 | /* Creates new ffs_data object. */ | |
49 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); | |
50 | ||
51 | /* Opened counter handling. */ | |
52 | static void ffs_data_opened(struct ffs_data *ffs); | |
53 | static void ffs_data_closed(struct ffs_data *ffs); | |
54 | ||
5ab54cf7 | 55 | /* Called with ffs->mutex held; take over ownership of data. */ |
ddf8abd2 MN |
56 | static int __must_check |
57 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); | |
58 | static int __must_check | |
59 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); | |
60 | ||
61 | ||
62 | /* The function structure ***************************************************/ | |
63 | ||
64 | struct ffs_ep; | |
65 | ||
66 | struct ffs_function { | |
67 | struct usb_configuration *conf; | |
68 | struct usb_gadget *gadget; | |
69 | struct ffs_data *ffs; | |
70 | ||
71 | struct ffs_ep *eps; | |
72 | u8 eps_revmap[16]; | |
73 | short *interfaces_nums; | |
74 | ||
75 | struct usb_function function; | |
76 | }; | |
77 | ||
78 | ||
79 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) | |
80 | { | |
81 | return container_of(f, struct ffs_function, function); | |
82 | } | |
83 | ||
ddf8abd2 | 84 | |
a7ecf054 MN |
85 | static inline enum ffs_setup_state |
86 | ffs_setup_state_clear_cancelled(struct ffs_data *ffs) | |
87 | { | |
88 | return (enum ffs_setup_state) | |
89 | cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); | |
90 | } | |
91 | ||
92 | ||
ddf8abd2 MN |
93 | static void ffs_func_eps_disable(struct ffs_function *func); |
94 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); | |
95 | ||
ddf8abd2 MN |
96 | static int ffs_func_bind(struct usb_configuration *, |
97 | struct usb_function *); | |
ddf8abd2 MN |
98 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); |
99 | static void ffs_func_disable(struct usb_function *); | |
100 | static int ffs_func_setup(struct usb_function *, | |
101 | const struct usb_ctrlrequest *); | |
54dfce6d | 102 | static bool ffs_func_req_match(struct usb_function *, |
1a00b457 FH |
103 | const struct usb_ctrlrequest *, |
104 | bool config0); | |
ddf8abd2 MN |
105 | static void ffs_func_suspend(struct usb_function *); |
106 | static void ffs_func_resume(struct usb_function *); | |
107 | ||
108 | ||
109 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); | |
110 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); | |
111 | ||
112 | ||
ddf8abd2 MN |
113 | /* The endpoints structures *************************************************/ |
114 | ||
115 | struct ffs_ep { | |
116 | struct usb_ep *ep; /* P: ffs->eps_lock */ | |
117 | struct usb_request *req; /* P: epfile->mutex */ | |
118 | ||
8d4e897b MG |
119 | /* [0]: full speed, [1]: high speed, [2]: super speed */ |
120 | struct usb_endpoint_descriptor *descs[3]; | |
ddf8abd2 MN |
121 | |
122 | u8 num; | |
123 | ||
124 | int status; /* P: epfile->mutex */ | |
125 | }; | |
126 | ||
127 | struct ffs_epfile { | |
128 | /* Protects ep->ep and ep->req. */ | |
129 | struct mutex mutex; | |
130 | wait_queue_head_t wait; | |
131 | ||
132 | struct ffs_data *ffs; | |
133 | struct ffs_ep *ep; /* P: ffs->eps_lock */ | |
134 | ||
135 | struct dentry *dentry; | |
136 | ||
9353afbb MN |
137 | /* |
138 | * Buffer for holding data from partial reads which may happen since | |
139 | * we’re rounding user read requests to a multiple of a max packet size. | |
a9e6f83c MN |
140 | * |
141 | * The pointer is initialised with NULL value and may be set by | |
142 | * __ffs_epfile_read_data function to point to a temporary buffer. | |
143 | * | |
144 | * In normal operation, calls to __ffs_epfile_read_buffered will consume | |
145 | * data from said buffer and eventually free it. Importantly, while the | |
146 | * function is using the buffer, it sets the pointer to NULL. This is | |
147 | * all right since __ffs_epfile_read_data and __ffs_epfile_read_buffered | |
148 | * can never run concurrently (they are synchronised by epfile->mutex) | |
149 | * so the latter will not assign a new value to the pointer. | |
150 | * | |
151 | * Meanwhile ffs_func_eps_disable frees the buffer (if the pointer is | |
152 | * valid) and sets the pointer to READ_BUFFER_DROP value. This special | |
153 | * value is crux of the synchronisation between ffs_func_eps_disable and | |
154 | * __ffs_epfile_read_data. | |
155 | * | |
156 | * Once __ffs_epfile_read_data is about to finish it will try to set the | |
157 | * pointer back to its old value (as described above), but seeing as the | |
158 | * pointer is not-NULL (namely READ_BUFFER_DROP) it will instead free | |
159 | * the buffer. | |
160 | * | |
161 | * == State transitions == | |
162 | * | |
163 | * • ptr == NULL: (initial state) | |
164 | * ◦ __ffs_epfile_read_buffer_free: go to ptr == DROP | |
165 | * ◦ __ffs_epfile_read_buffered: nop | |
166 | * ◦ __ffs_epfile_read_data allocates temp buffer: go to ptr == buf | |
167 | * ◦ reading finishes: n/a, not in ‘and reading’ state | |
168 | * • ptr == DROP: | |
169 | * ◦ __ffs_epfile_read_buffer_free: nop | |
170 | * ◦ __ffs_epfile_read_buffered: go to ptr == NULL | |
171 | * ◦ __ffs_epfile_read_data allocates temp buffer: free buf, nop | |
172 | * ◦ reading finishes: n/a, not in ‘and reading’ state | |
173 | * • ptr == buf: | |
174 | * ◦ __ffs_epfile_read_buffer_free: free buf, go to ptr == DROP | |
175 | * ◦ __ffs_epfile_read_buffered: go to ptr == NULL and reading | |
176 | * ◦ __ffs_epfile_read_data: n/a, __ffs_epfile_read_buffered | |
177 | * is always called first | |
178 | * ◦ reading finishes: n/a, not in ‘and reading’ state | |
179 | * • ptr == NULL and reading: | |
180 | * ◦ __ffs_epfile_read_buffer_free: go to ptr == DROP and reading | |
181 | * ◦ __ffs_epfile_read_buffered: n/a, mutex is held | |
182 | * ◦ __ffs_epfile_read_data: n/a, mutex is held | |
183 | * ◦ reading finishes and … | |
184 | * … all data read: free buf, go to ptr == NULL | |
185 | * … otherwise: go to ptr == buf and reading | |
186 | * • ptr == DROP and reading: | |
187 | * ◦ __ffs_epfile_read_buffer_free: nop | |
188 | * ◦ __ffs_epfile_read_buffered: n/a, mutex is held | |
189 | * ◦ __ffs_epfile_read_data: n/a, mutex is held | |
190 | * ◦ reading finishes: free buf, go to ptr == DROP | |
9353afbb | 191 | */ |
a9e6f83c MN |
192 | struct ffs_buffer *read_buffer; |
193 | #define READ_BUFFER_DROP ((struct ffs_buffer *)ERR_PTR(-ESHUTDOWN)) | |
9353afbb | 194 | |
ddf8abd2 MN |
195 | char name[5]; |
196 | ||
197 | unsigned char in; /* P: ffs->eps_lock */ | |
198 | unsigned char isoc; /* P: ffs->eps_lock */ | |
199 | ||
200 | unsigned char _pad; | |
201 | }; | |
202 | ||
9353afbb MN |
203 | struct ffs_buffer { |
204 | size_t length; | |
205 | char *data; | |
206 | char storage[]; | |
207 | }; | |
208 | ||
2e4c7553 RB |
209 | /* ffs_io_data structure ***************************************************/ |
210 | ||
211 | struct ffs_io_data { | |
212 | bool aio; | |
213 | bool read; | |
214 | ||
215 | struct kiocb *kiocb; | |
c993c39b AV |
216 | struct iov_iter data; |
217 | const void *to_free; | |
218 | char *buf; | |
2e4c7553 RB |
219 | |
220 | struct mm_struct *mm; | |
221 | struct work_struct work; | |
222 | ||
223 | struct usb_ep *ep; | |
224 | struct usb_request *req; | |
5e33f6fd RB |
225 | |
226 | struct ffs_data *ffs; | |
2e4c7553 RB |
227 | }; |
228 | ||
6d5c1c77 RB |
229 | struct ffs_desc_helper { |
230 | struct ffs_data *ffs; | |
231 | unsigned interfaces_count; | |
232 | unsigned eps_count; | |
233 | }; | |
234 | ||
ddf8abd2 MN |
235 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
236 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); | |
237 | ||
1bb27cac | 238 | static struct dentry * |
ddf8abd2 | 239 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, |
1bb27cac | 240 | const struct file_operations *fops); |
ddf8abd2 | 241 | |
4b187fce AP |
242 | /* Devices management *******************************************************/ |
243 | ||
244 | DEFINE_MUTEX(ffs_lock); | |
0700faaf | 245 | EXPORT_SYMBOL_GPL(ffs_lock); |
4b187fce | 246 | |
da13a773 AP |
247 | static struct ffs_dev *_ffs_find_dev(const char *name); |
248 | static struct ffs_dev *_ffs_alloc_dev(void); | |
b658499f | 249 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name); |
da13a773 | 250 | static void _ffs_free_dev(struct ffs_dev *dev); |
4b187fce AP |
251 | static void *ffs_acquire_dev(const char *dev_name); |
252 | static void ffs_release_dev(struct ffs_data *ffs_data); | |
253 | static int ffs_ready(struct ffs_data *ffs); | |
254 | static void ffs_closed(struct ffs_data *ffs); | |
ddf8abd2 MN |
255 | |
256 | /* Misc helper functions ****************************************************/ | |
257 | ||
258 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
259 | __attribute__((warn_unused_result, nonnull)); | |
260ef311 | 260 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
261 | __attribute__((warn_unused_result, nonnull)); |
262 | ||
263 | ||
264 | /* Control file aka ep0 *****************************************************/ | |
265 | ||
266 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
267 | { | |
268 | struct ffs_data *ffs = req->context; | |
269 | ||
5bdcde90 | 270 | complete(&ffs->ep0req_completion); |
ddf8abd2 MN |
271 | } |
272 | ||
ddf8abd2 MN |
273 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
274 | { | |
275 | struct usb_request *req = ffs->ep0req; | |
276 | int ret; | |
277 | ||
278 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); | |
279 | ||
280 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
281 | ||
282 | req->buf = data; | |
283 | req->length = len; | |
284 | ||
ce1fd358 MS |
285 | /* |
286 | * UDC layer requires to provide a buffer even for ZLP, but should | |
287 | * not use it at all. Let's provide some poisoned pointer to catch | |
288 | * possible bug in the driver. | |
289 | */ | |
290 | if (req->buf == NULL) | |
291 | req->buf = (void *)0xDEADBABE; | |
292 | ||
16735d02 | 293 | reinit_completion(&ffs->ep0req_completion); |
ddf8abd2 MN |
294 | |
295 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); | |
296 | if (unlikely(ret < 0)) | |
297 | return ret; | |
298 | ||
299 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); | |
300 | if (unlikely(ret)) { | |
301 | usb_ep_dequeue(ffs->gadget->ep0, req); | |
302 | return -EINTR; | |
303 | } | |
304 | ||
305 | ffs->setup_state = FFS_NO_SETUP; | |
0a7b1f8a | 306 | return req->status ? req->status : req->actual; |
ddf8abd2 MN |
307 | } |
308 | ||
309 | static int __ffs_ep0_stall(struct ffs_data *ffs) | |
310 | { | |
311 | if (ffs->ev.can_stall) { | |
aa02f172 | 312 | pr_vdebug("ep0 stall\n"); |
ddf8abd2 MN |
313 | usb_ep_set_halt(ffs->gadget->ep0); |
314 | ffs->setup_state = FFS_NO_SETUP; | |
315 | return -EL2HLT; | |
316 | } else { | |
aa02f172 | 317 | pr_debug("bogus ep0 stall!\n"); |
ddf8abd2 MN |
318 | return -ESRCH; |
319 | } | |
320 | } | |
321 | ||
ddf8abd2 MN |
322 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
323 | size_t len, loff_t *ptr) | |
324 | { | |
325 | struct ffs_data *ffs = file->private_data; | |
326 | ssize_t ret; | |
327 | char *data; | |
328 | ||
329 | ENTER(); | |
330 | ||
331 | /* Fast check if setup was canceled */ | |
a7ecf054 | 332 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
333 | return -EIDRM; |
334 | ||
335 | /* Acquire mutex */ | |
336 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
337 | if (unlikely(ret < 0)) | |
338 | return ret; | |
339 | ||
ddf8abd2 MN |
340 | /* Check state */ |
341 | switch (ffs->state) { | |
342 | case FFS_READ_DESCRIPTORS: | |
343 | case FFS_READ_STRINGS: | |
344 | /* Copy data */ | |
345 | if (unlikely(len < 16)) { | |
346 | ret = -EINVAL; | |
347 | break; | |
348 | } | |
349 | ||
350 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 351 | if (IS_ERR(data)) { |
ddf8abd2 MN |
352 | ret = PTR_ERR(data); |
353 | break; | |
354 | } | |
355 | ||
356 | /* Handle data */ | |
357 | if (ffs->state == FFS_READ_DESCRIPTORS) { | |
aa02f172 | 358 | pr_info("read descriptors\n"); |
ddf8abd2 MN |
359 | ret = __ffs_data_got_descs(ffs, data, len); |
360 | if (unlikely(ret < 0)) | |
361 | break; | |
362 | ||
363 | ffs->state = FFS_READ_STRINGS; | |
364 | ret = len; | |
365 | } else { | |
aa02f172 | 366 | pr_info("read strings\n"); |
ddf8abd2 MN |
367 | ret = __ffs_data_got_strings(ffs, data, len); |
368 | if (unlikely(ret < 0)) | |
369 | break; | |
370 | ||
371 | ret = ffs_epfiles_create(ffs); | |
372 | if (unlikely(ret)) { | |
373 | ffs->state = FFS_CLOSING; | |
374 | break; | |
375 | } | |
376 | ||
377 | ffs->state = FFS_ACTIVE; | |
378 | mutex_unlock(&ffs->mutex); | |
379 | ||
4b187fce | 380 | ret = ffs_ready(ffs); |
ddf8abd2 MN |
381 | if (unlikely(ret < 0)) { |
382 | ffs->state = FFS_CLOSING; | |
383 | return ret; | |
384 | } | |
385 | ||
ddf8abd2 MN |
386 | return len; |
387 | } | |
388 | break; | |
389 | ||
ddf8abd2 MN |
390 | case FFS_ACTIVE: |
391 | data = NULL; | |
5ab54cf7 MN |
392 | /* |
393 | * We're called from user space, we can use _irq | |
394 | * rather then _irqsave | |
395 | */ | |
ddf8abd2 | 396 | spin_lock_irq(&ffs->ev.waitq.lock); |
a7ecf054 | 397 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 398 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
399 | ret = -EIDRM; |
400 | goto done_spin; | |
401 | ||
402 | case FFS_NO_SETUP: | |
403 | ret = -ESRCH; | |
404 | goto done_spin; | |
405 | ||
406 | case FFS_SETUP_PENDING: | |
407 | break; | |
408 | } | |
409 | ||
410 | /* FFS_SETUP_PENDING */ | |
411 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { | |
412 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
413 | ret = __ffs_ep0_stall(ffs); | |
414 | break; | |
415 | } | |
416 | ||
417 | /* FFS_SETUP_PENDING and not stall */ | |
418 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
419 | ||
420 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
421 | ||
422 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 423 | if (IS_ERR(data)) { |
ddf8abd2 MN |
424 | ret = PTR_ERR(data); |
425 | break; | |
426 | } | |
427 | ||
428 | spin_lock_irq(&ffs->ev.waitq.lock); | |
429 | ||
5ab54cf7 MN |
430 | /* |
431 | * We are guaranteed to be still in FFS_ACTIVE state | |
ddf8abd2 | 432 | * but the state of setup could have changed from |
e46318a0 | 433 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELLED so we need |
ddf8abd2 | 434 | * to check for that. If that happened we copied data |
5ab54cf7 MN |
435 | * from user space in vain but it's unlikely. |
436 | * | |
437 | * For sure we are not in FFS_NO_SETUP since this is | |
ddf8abd2 MN |
438 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
439 | * transition can be performed and it's protected by | |
5ab54cf7 MN |
440 | * mutex. |
441 | */ | |
a7ecf054 MN |
442 | if (ffs_setup_state_clear_cancelled(ffs) == |
443 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
444 | ret = -EIDRM; |
445 | done_spin: | |
446 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
447 | } else { | |
448 | /* unlocks spinlock */ | |
449 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
450 | } | |
451 | kfree(data); | |
452 | break; | |
453 | ||
ddf8abd2 MN |
454 | default: |
455 | ret = -EBADFD; | |
456 | break; | |
457 | } | |
458 | ||
ddf8abd2 MN |
459 | mutex_unlock(&ffs->mutex); |
460 | return ret; | |
461 | } | |
462 | ||
67913bbd | 463 | /* Called with ffs->ev.waitq.lock and ffs->mutex held, both released on exit. */ |
ddf8abd2 MN |
464 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, |
465 | size_t n) | |
466 | { | |
5ab54cf7 | 467 | /* |
67913bbd MN |
468 | * n cannot be bigger than ffs->ev.count, which cannot be bigger than |
469 | * size of ffs->ev.types array (which is four) so that's how much space | |
470 | * we reserve. | |
5ab54cf7 | 471 | */ |
67913bbd MN |
472 | struct usb_functionfs_event events[ARRAY_SIZE(ffs->ev.types)]; |
473 | const size_t size = n * sizeof *events; | |
ddf8abd2 MN |
474 | unsigned i = 0; |
475 | ||
67913bbd | 476 | memset(events, 0, size); |
ddf8abd2 MN |
477 | |
478 | do { | |
479 | events[i].type = ffs->ev.types[i]; | |
480 | if (events[i].type == FUNCTIONFS_SETUP) { | |
481 | events[i].u.setup = ffs->ev.setup; | |
482 | ffs->setup_state = FFS_SETUP_PENDING; | |
483 | } | |
484 | } while (++i < n); | |
485 | ||
67913bbd MN |
486 | ffs->ev.count -= n; |
487 | if (ffs->ev.count) | |
ddf8abd2 MN |
488 | memmove(ffs->ev.types, ffs->ev.types + n, |
489 | ffs->ev.count * sizeof *ffs->ev.types); | |
ddf8abd2 MN |
490 | |
491 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
492 | mutex_unlock(&ffs->mutex); | |
493 | ||
7fe9a937 | 494 | return unlikely(copy_to_user(buf, events, size)) ? -EFAULT : size; |
ddf8abd2 MN |
495 | } |
496 | ||
ddf8abd2 MN |
497 | static ssize_t ffs_ep0_read(struct file *file, char __user *buf, |
498 | size_t len, loff_t *ptr) | |
499 | { | |
500 | struct ffs_data *ffs = file->private_data; | |
501 | char *data = NULL; | |
502 | size_t n; | |
503 | int ret; | |
504 | ||
505 | ENTER(); | |
506 | ||
507 | /* Fast check if setup was canceled */ | |
a7ecf054 | 508 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
509 | return -EIDRM; |
510 | ||
511 | /* Acquire mutex */ | |
512 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
513 | if (unlikely(ret < 0)) | |
514 | return ret; | |
515 | ||
ddf8abd2 MN |
516 | /* Check state */ |
517 | if (ffs->state != FFS_ACTIVE) { | |
518 | ret = -EBADFD; | |
519 | goto done_mutex; | |
520 | } | |
521 | ||
5ab54cf7 MN |
522 | /* |
523 | * We're called from user space, we can use _irq rather then | |
524 | * _irqsave | |
525 | */ | |
ddf8abd2 MN |
526 | spin_lock_irq(&ffs->ev.waitq.lock); |
527 | ||
a7ecf054 | 528 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 529 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
530 | ret = -EIDRM; |
531 | break; | |
532 | ||
533 | case FFS_NO_SETUP: | |
534 | n = len / sizeof(struct usb_functionfs_event); | |
535 | if (unlikely(!n)) { | |
536 | ret = -EINVAL; | |
537 | break; | |
538 | } | |
539 | ||
540 | if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { | |
541 | ret = -EAGAIN; | |
542 | break; | |
543 | } | |
544 | ||
5ab54cf7 MN |
545 | if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, |
546 | ffs->ev.count)) { | |
ddf8abd2 MN |
547 | ret = -EINTR; |
548 | break; | |
549 | } | |
550 | ||
551 | return __ffs_ep0_read_events(ffs, buf, | |
552 | min(n, (size_t)ffs->ev.count)); | |
553 | ||
ddf8abd2 MN |
554 | case FFS_SETUP_PENDING: |
555 | if (ffs->ev.setup.bRequestType & USB_DIR_IN) { | |
556 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
557 | ret = __ffs_ep0_stall(ffs); | |
558 | goto done_mutex; | |
559 | } | |
560 | ||
561 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
562 | ||
563 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
564 | ||
565 | if (likely(len)) { | |
566 | data = kmalloc(len, GFP_KERNEL); | |
567 | if (unlikely(!data)) { | |
568 | ret = -ENOMEM; | |
569 | goto done_mutex; | |
570 | } | |
571 | } | |
572 | ||
573 | spin_lock_irq(&ffs->ev.waitq.lock); | |
574 | ||
575 | /* See ffs_ep0_write() */ | |
a7ecf054 MN |
576 | if (ffs_setup_state_clear_cancelled(ffs) == |
577 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
578 | ret = -EIDRM; |
579 | break; | |
580 | } | |
581 | ||
582 | /* unlocks spinlock */ | |
583 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
7fe9a937 | 584 | if (likely(ret > 0) && unlikely(copy_to_user(buf, data, len))) |
ddf8abd2 MN |
585 | ret = -EFAULT; |
586 | goto done_mutex; | |
587 | ||
588 | default: | |
589 | ret = -EBADFD; | |
590 | break; | |
591 | } | |
592 | ||
593 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
594 | done_mutex: | |
595 | mutex_unlock(&ffs->mutex); | |
596 | kfree(data); | |
597 | return ret; | |
598 | } | |
599 | ||
ddf8abd2 MN |
600 | static int ffs_ep0_open(struct inode *inode, struct file *file) |
601 | { | |
602 | struct ffs_data *ffs = inode->i_private; | |
603 | ||
604 | ENTER(); | |
605 | ||
606 | if (unlikely(ffs->state == FFS_CLOSING)) | |
607 | return -EBUSY; | |
608 | ||
609 | file->private_data = ffs; | |
610 | ffs_data_opened(ffs); | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
ddf8abd2 MN |
615 | static int ffs_ep0_release(struct inode *inode, struct file *file) |
616 | { | |
617 | struct ffs_data *ffs = file->private_data; | |
618 | ||
619 | ENTER(); | |
620 | ||
621 | ffs_data_closed(ffs); | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
ddf8abd2 MN |
626 | static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) |
627 | { | |
628 | struct ffs_data *ffs = file->private_data; | |
629 | struct usb_gadget *gadget = ffs->gadget; | |
630 | long ret; | |
631 | ||
632 | ENTER(); | |
633 | ||
634 | if (code == FUNCTIONFS_INTERFACE_REVMAP) { | |
635 | struct ffs_function *func = ffs->func; | |
636 | ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; | |
92b0abf8 | 637 | } else if (gadget && gadget->ops->ioctl) { |
ddf8abd2 | 638 | ret = gadget->ops->ioctl(gadget, code, value); |
ddf8abd2 MN |
639 | } else { |
640 | ret = -ENOTTY; | |
641 | } | |
642 | ||
643 | return ret; | |
644 | } | |
645 | ||
23de91e9 RB |
646 | static unsigned int ffs_ep0_poll(struct file *file, poll_table *wait) |
647 | { | |
648 | struct ffs_data *ffs = file->private_data; | |
649 | unsigned int mask = POLLWRNORM; | |
650 | int ret; | |
651 | ||
652 | poll_wait(file, &ffs->ev.waitq, wait); | |
653 | ||
654 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
655 | if (unlikely(ret < 0)) | |
656 | return mask; | |
657 | ||
658 | switch (ffs->state) { | |
659 | case FFS_READ_DESCRIPTORS: | |
660 | case FFS_READ_STRINGS: | |
661 | mask |= POLLOUT; | |
662 | break; | |
663 | ||
664 | case FFS_ACTIVE: | |
665 | switch (ffs->setup_state) { | |
666 | case FFS_NO_SETUP: | |
667 | if (ffs->ev.count) | |
668 | mask |= POLLIN; | |
669 | break; | |
670 | ||
671 | case FFS_SETUP_PENDING: | |
672 | case FFS_SETUP_CANCELLED: | |
673 | mask |= (POLLIN | POLLOUT); | |
674 | break; | |
675 | } | |
676 | case FFS_CLOSING: | |
677 | break; | |
18d6b32f RB |
678 | case FFS_DEACTIVATED: |
679 | break; | |
23de91e9 RB |
680 | } |
681 | ||
682 | mutex_unlock(&ffs->mutex); | |
683 | ||
684 | return mask; | |
685 | } | |
686 | ||
ddf8abd2 | 687 | static const struct file_operations ffs_ep0_operations = { |
ddf8abd2 MN |
688 | .llseek = no_llseek, |
689 | ||
690 | .open = ffs_ep0_open, | |
691 | .write = ffs_ep0_write, | |
692 | .read = ffs_ep0_read, | |
693 | .release = ffs_ep0_release, | |
694 | .unlocked_ioctl = ffs_ep0_ioctl, | |
23de91e9 | 695 | .poll = ffs_ep0_poll, |
ddf8abd2 MN |
696 | }; |
697 | ||
698 | ||
699 | /* "Normal" endpoints operations ********************************************/ | |
700 | ||
ddf8abd2 MN |
701 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) |
702 | { | |
703 | ENTER(); | |
704 | if (likely(req->context)) { | |
705 | struct ffs_ep *ep = _ep->driver_data; | |
706 | ep->status = req->status ? req->status : req->actual; | |
707 | complete(req->context); | |
708 | } | |
709 | } | |
710 | ||
c662a31b MN |
711 | static ssize_t ffs_copy_to_iter(void *data, int data_len, struct iov_iter *iter) |
712 | { | |
713 | ssize_t ret = copy_to_iter(data, data_len, iter); | |
714 | if (likely(ret == data_len)) | |
715 | return ret; | |
716 | ||
717 | if (unlikely(iov_iter_count(iter))) | |
718 | return -EFAULT; | |
719 | ||
720 | /* | |
721 | * Dear user space developer! | |
722 | * | |
723 | * TL;DR: To stop getting below error message in your kernel log, change | |
724 | * user space code using functionfs to align read buffers to a max | |
725 | * packet size. | |
726 | * | |
727 | * Some UDCs (e.g. dwc3) require request sizes to be a multiple of a max | |
728 | * packet size. When unaligned buffer is passed to functionfs, it | |
729 | * internally uses a larger, aligned buffer so that such UDCs are happy. | |
730 | * | |
731 | * Unfortunately, this means that host may send more data than was | |
732 | * requested in read(2) system call. f_fs doesn’t know what to do with | |
733 | * that excess data so it simply drops it. | |
734 | * | |
735 | * Was the buffer aligned in the first place, no such problem would | |
736 | * happen. | |
737 | * | |
9353afbb MN |
738 | * Data may be dropped only in AIO reads. Synchronous reads are handled |
739 | * by splitting a request into multiple parts. This splitting may still | |
740 | * be a problem though so it’s likely best to align the buffer | |
741 | * regardless of it being AIO or not.. | |
742 | * | |
c662a31b MN |
743 | * This only affects OUT endpoints, i.e. reading data with a read(2), |
744 | * aio_read(2) etc. system calls. Writing data to an IN endpoint is not | |
745 | * affected. | |
746 | */ | |
747 | pr_err("functionfs read size %d > requested size %zd, dropping excess data. " | |
748 | "Align read buffer size to max packet size to avoid the problem.\n", | |
749 | data_len, ret); | |
750 | ||
751 | return ret; | |
752 | } | |
753 | ||
2e4c7553 RB |
754 | static void ffs_user_copy_worker(struct work_struct *work) |
755 | { | |
756 | struct ffs_io_data *io_data = container_of(work, struct ffs_io_data, | |
757 | work); | |
758 | int ret = io_data->req->status ? io_data->req->status : | |
759 | io_data->req->actual; | |
38740a5b | 760 | bool kiocb_has_eventfd = io_data->kiocb->ki_flags & IOCB_EVENTFD; |
2e4c7553 RB |
761 | |
762 | if (io_data->read && ret > 0) { | |
2e4c7553 | 763 | use_mm(io_data->mm); |
c662a31b | 764 | ret = ffs_copy_to_iter(io_data->buf, ret, &io_data->data); |
2e4c7553 RB |
765 | unuse_mm(io_data->mm); |
766 | } | |
767 | ||
04b2fa9f | 768 | io_data->kiocb->ki_complete(io_data->kiocb, ret, ret); |
2e4c7553 | 769 | |
38740a5b | 770 | if (io_data->ffs->ffs_eventfd && !kiocb_has_eventfd) |
5e33f6fd RB |
771 | eventfd_signal(io_data->ffs->ffs_eventfd, 1); |
772 | ||
2e4c7553 RB |
773 | usb_ep_free_request(io_data->ep, io_data->req); |
774 | ||
2e4c7553 | 775 | if (io_data->read) |
c993c39b | 776 | kfree(io_data->to_free); |
2e4c7553 RB |
777 | kfree(io_data->buf); |
778 | kfree(io_data); | |
779 | } | |
780 | ||
781 | static void ffs_epfile_async_io_complete(struct usb_ep *_ep, | |
782 | struct usb_request *req) | |
783 | { | |
784 | struct ffs_io_data *io_data = req->context; | |
785 | ||
786 | ENTER(); | |
787 | ||
788 | INIT_WORK(&io_data->work, ffs_user_copy_worker); | |
789 | schedule_work(&io_data->work); | |
790 | } | |
791 | ||
a9e6f83c MN |
792 | static void __ffs_epfile_read_buffer_free(struct ffs_epfile *epfile) |
793 | { | |
794 | /* | |
795 | * See comment in struct ffs_epfile for full read_buffer pointer | |
796 | * synchronisation story. | |
797 | */ | |
798 | struct ffs_buffer *buf = xchg(&epfile->read_buffer, READ_BUFFER_DROP); | |
799 | if (buf && buf != READ_BUFFER_DROP) | |
800 | kfree(buf); | |
801 | } | |
802 | ||
9353afbb MN |
803 | /* Assumes epfile->mutex is held. */ |
804 | static ssize_t __ffs_epfile_read_buffered(struct ffs_epfile *epfile, | |
805 | struct iov_iter *iter) | |
806 | { | |
a9e6f83c MN |
807 | /* |
808 | * Null out epfile->read_buffer so ffs_func_eps_disable does not free | |
809 | * the buffer while we are using it. See comment in struct ffs_epfile | |
810 | * for full read_buffer pointer synchronisation story. | |
811 | */ | |
812 | struct ffs_buffer *buf = xchg(&epfile->read_buffer, NULL); | |
9353afbb | 813 | ssize_t ret; |
a9e6f83c | 814 | if (!buf || buf == READ_BUFFER_DROP) |
9353afbb MN |
815 | return 0; |
816 | ||
817 | ret = copy_to_iter(buf->data, buf->length, iter); | |
818 | if (buf->length == ret) { | |
819 | kfree(buf); | |
a9e6f83c MN |
820 | return ret; |
821 | } | |
822 | ||
823 | if (unlikely(iov_iter_count(iter))) { | |
9353afbb MN |
824 | ret = -EFAULT; |
825 | } else { | |
826 | buf->length -= ret; | |
827 | buf->data += ret; | |
828 | } | |
a9e6f83c MN |
829 | |
830 | if (cmpxchg(&epfile->read_buffer, NULL, buf)) | |
831 | kfree(buf); | |
832 | ||
9353afbb MN |
833 | return ret; |
834 | } | |
835 | ||
836 | /* Assumes epfile->mutex is held. */ | |
837 | static ssize_t __ffs_epfile_read_data(struct ffs_epfile *epfile, | |
838 | void *data, int data_len, | |
839 | struct iov_iter *iter) | |
840 | { | |
841 | struct ffs_buffer *buf; | |
842 | ||
843 | ssize_t ret = copy_to_iter(data, data_len, iter); | |
844 | if (likely(data_len == ret)) | |
845 | return ret; | |
846 | ||
847 | if (unlikely(iov_iter_count(iter))) | |
848 | return -EFAULT; | |
849 | ||
850 | /* See ffs_copy_to_iter for more context. */ | |
851 | pr_warn("functionfs read size %d > requested size %zd, splitting request into multiple reads.", | |
852 | data_len, ret); | |
853 | ||
854 | data_len -= ret; | |
855 | buf = kmalloc(sizeof(*buf) + data_len, GFP_KERNEL); | |
44963d64 DC |
856 | if (!buf) |
857 | return -ENOMEM; | |
9353afbb MN |
858 | buf->length = data_len; |
859 | buf->data = buf->storage; | |
860 | memcpy(buf->storage, data + ret, data_len); | |
a9e6f83c MN |
861 | |
862 | /* | |
863 | * At this point read_buffer is NULL or READ_BUFFER_DROP (if | |
864 | * ffs_func_eps_disable has been called in the meanwhile). See comment | |
865 | * in struct ffs_epfile for full read_buffer pointer synchronisation | |
866 | * story. | |
867 | */ | |
868 | if (unlikely(cmpxchg(&epfile->read_buffer, NULL, buf))) | |
869 | kfree(buf); | |
9353afbb MN |
870 | |
871 | return ret; | |
872 | } | |
873 | ||
2e4c7553 | 874 | static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data) |
ddf8abd2 MN |
875 | { |
876 | struct ffs_epfile *epfile = file->private_data; | |
ae76e134 | 877 | struct usb_request *req; |
ddf8abd2 MN |
878 | struct ffs_ep *ep; |
879 | char *data = NULL; | |
c0d31b3c | 880 | ssize_t ret, data_len = -EINVAL; |
ddf8abd2 MN |
881 | int halt; |
882 | ||
7fa68034 | 883 | /* Are we still active? */ |
b3591f67 MN |
884 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) |
885 | return -ENODEV; | |
ddf8abd2 | 886 | |
7fa68034 MN |
887 | /* Wait for endpoint to be enabled */ |
888 | ep = epfile->ep; | |
889 | if (!ep) { | |
b3591f67 MN |
890 | if (file->f_flags & O_NONBLOCK) |
891 | return -EAGAIN; | |
ddf8abd2 | 892 | |
7fa68034 | 893 | ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep)); |
b3591f67 MN |
894 | if (ret) |
895 | return -EINTR; | |
7fa68034 | 896 | } |
ddf8abd2 | 897 | |
7fa68034 | 898 | /* Do we halt? */ |
2e4c7553 | 899 | halt = (!io_data->read == !epfile->in); |
b3591f67 MN |
900 | if (halt && epfile->isoc) |
901 | return -EINVAL; | |
ddf8abd2 | 902 | |
9353afbb MN |
903 | /* We will be using request and read_buffer */ |
904 | ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); | |
905 | if (unlikely(ret)) | |
906 | goto error; | |
907 | ||
7fa68034 MN |
908 | /* Allocate & copy */ |
909 | if (!halt) { | |
9353afbb MN |
910 | struct usb_gadget *gadget; |
911 | ||
912 | /* | |
913 | * Do we have buffered data from previous partial read? Check | |
914 | * that for synchronous case only because we do not have | |
915 | * facility to ‘wake up’ a pending asynchronous read and push | |
916 | * buffered data to it which we would need to make things behave | |
917 | * consistently. | |
918 | */ | |
919 | if (!io_data->aio && io_data->read) { | |
920 | ret = __ffs_epfile_read_buffered(epfile, &io_data->data); | |
921 | if (ret) | |
922 | goto error_mutex; | |
923 | } | |
924 | ||
f0f42204 AP |
925 | /* |
926 | * if we _do_ wait above, the epfile->ffs->gadget might be NULL | |
ae76e134 MN |
927 | * before the waiting completes, so do not assign to 'gadget' |
928 | * earlier | |
f0f42204 | 929 | */ |
9353afbb | 930 | gadget = epfile->ffs->gadget; |
f0f42204 | 931 | |
97839ca4 CB |
932 | spin_lock_irq(&epfile->ffs->eps_lock); |
933 | /* In the meantime, endpoint got disabled or changed. */ | |
934 | if (epfile->ep != ep) { | |
9353afbb MN |
935 | ret = -ESHUTDOWN; |
936 | goto error_lock; | |
97839ca4 | 937 | } |
c993c39b | 938 | data_len = iov_iter_count(&io_data->data); |
219580e6 MN |
939 | /* |
940 | * Controller may require buffer size to be aligned to | |
941 | * maxpacketsize of an out endpoint. | |
942 | */ | |
c993c39b AV |
943 | if (io_data->read) |
944 | data_len = usb_ep_align_maybe(gadget, ep->ep, data_len); | |
97839ca4 | 945 | spin_unlock_irq(&epfile->ffs->eps_lock); |
219580e6 MN |
946 | |
947 | data = kmalloc(data_len, GFP_KERNEL); | |
9353afbb MN |
948 | if (unlikely(!data)) { |
949 | ret = -ENOMEM; | |
950 | goto error_mutex; | |
951 | } | |
952 | if (!io_data->read && | |
cbbd26b8 | 953 | !copy_from_iter_full(data, data_len, &io_data->data)) { |
9353afbb MN |
954 | ret = -EFAULT; |
955 | goto error_mutex; | |
7fa68034 MN |
956 | } |
957 | } | |
ddf8abd2 | 958 | |
7fa68034 | 959 | spin_lock_irq(&epfile->ffs->eps_lock); |
ddf8abd2 | 960 | |
7fa68034 MN |
961 | if (epfile->ep != ep) { |
962 | /* In the meantime, endpoint got disabled or changed. */ | |
963 | ret = -ESHUTDOWN; | |
7fa68034 MN |
964 | } else if (halt) { |
965 | /* Halt */ | |
ddf8abd2 MN |
966 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) |
967 | usb_ep_set_halt(ep->ep); | |
ddf8abd2 | 968 | ret = -EBADMSG; |
ae76e134 | 969 | } else if (unlikely(data_len == -EINVAL)) { |
c0d31b3c DC |
970 | /* |
971 | * Sanity Check: even though data_len can't be used | |
972 | * uninitialized at the time I write this comment, some | |
973 | * compilers complain about this situation. | |
974 | * In order to keep the code clean from warnings, data_len is | |
975 | * being initialized to -EINVAL during its declaration, which | |
976 | * means we can't rely on compiler anymore to warn no future | |
977 | * changes won't result in data_len being used uninitialized. | |
978 | * For such reason, we're adding this redundant sanity check | |
979 | * here. | |
980 | */ | |
ae76e134 MN |
981 | WARN(1, "%s: data_len == -EINVAL\n", __func__); |
982 | ret = -EINVAL; | |
983 | } else if (!io_data->aio) { | |
984 | DECLARE_COMPLETION_ONSTACK(done); | |
ef150884 | 985 | bool interrupted = false; |
ddf8abd2 | 986 | |
ae76e134 MN |
987 | req = ep->req; |
988 | req->buf = data; | |
989 | req->length = data_len; | |
ddf8abd2 | 990 | |
ae76e134 MN |
991 | req->context = &done; |
992 | req->complete = ffs_epfile_io_complete; | |
2e4c7553 | 993 | |
ae76e134 MN |
994 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); |
995 | if (unlikely(ret < 0)) | |
996 | goto error_lock; | |
2e4c7553 | 997 | |
ae76e134 | 998 | spin_unlock_irq(&epfile->ffs->eps_lock); |
2e4c7553 | 999 | |
ae76e134 | 1000 | if (unlikely(wait_for_completion_interruptible(&done))) { |
ef150884 DC |
1001 | /* |
1002 | * To avoid race condition with ffs_epfile_io_complete, | |
1003 | * dequeue the request first then check | |
1004 | * status. usb_ep_dequeue API should guarantee no race | |
1005 | * condition with req->complete callback. | |
1006 | */ | |
ae76e134 | 1007 | usb_ep_dequeue(ep->ep, req); |
ef150884 | 1008 | interrupted = ep->status < 0; |
ae76e134 | 1009 | } |
2e4c7553 | 1010 | |
c662a31b MN |
1011 | if (interrupted) |
1012 | ret = -EINTR; | |
1013 | else if (io_data->read && ep->status > 0) | |
9353afbb MN |
1014 | ret = __ffs_epfile_read_data(epfile, data, ep->status, |
1015 | &io_data->data); | |
c662a31b MN |
1016 | else |
1017 | ret = ep->status; | |
ae76e134 MN |
1018 | goto error_mutex; |
1019 | } else if (!(req = usb_ep_alloc_request(ep->ep, GFP_KERNEL))) { | |
1020 | ret = -ENOMEM; | |
1021 | } else { | |
1022 | req->buf = data; | |
1023 | req->length = data_len; | |
2e4c7553 | 1024 | |
ae76e134 MN |
1025 | io_data->buf = data; |
1026 | io_data->ep = ep->ep; | |
1027 | io_data->req = req; | |
1028 | io_data->ffs = epfile->ffs; | |
2e4c7553 | 1029 | |
ae76e134 MN |
1030 | req->context = io_data; |
1031 | req->complete = ffs_epfile_async_io_complete; | |
2e4c7553 | 1032 | |
ae76e134 MN |
1033 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); |
1034 | if (unlikely(ret)) { | |
1035 | usb_ep_free_request(ep->ep, req); | |
1036 | goto error_lock; | |
ddf8abd2 | 1037 | } |
ddf8abd2 | 1038 | |
ae76e134 MN |
1039 | ret = -EIOCBQUEUED; |
1040 | /* | |
1041 | * Do not kfree the buffer in this function. It will be freed | |
1042 | * by ffs_user_copy_worker. | |
1043 | */ | |
1044 | data = NULL; | |
1045 | } | |
48968f8d RB |
1046 | |
1047 | error_lock: | |
1048 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
ae76e134 | 1049 | error_mutex: |
48968f8d | 1050 | mutex_unlock(&epfile->mutex); |
ddf8abd2 MN |
1051 | error: |
1052 | kfree(data); | |
1053 | return ret; | |
1054 | } | |
1055 | ||
ddf8abd2 MN |
1056 | static int |
1057 | ffs_epfile_open(struct inode *inode, struct file *file) | |
1058 | { | |
1059 | struct ffs_epfile *epfile = inode->i_private; | |
1060 | ||
1061 | ENTER(); | |
1062 | ||
1063 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
1064 | return -ENODEV; | |
1065 | ||
1066 | file->private_data = epfile; | |
1067 | ffs_data_opened(epfile->ffs); | |
1068 | ||
1069 | return 0; | |
1070 | } | |
1071 | ||
2e4c7553 RB |
1072 | static int ffs_aio_cancel(struct kiocb *kiocb) |
1073 | { | |
1074 | struct ffs_io_data *io_data = kiocb->private; | |
1075 | struct ffs_epfile *epfile = kiocb->ki_filp->private_data; | |
1076 | int value; | |
1077 | ||
1078 | ENTER(); | |
1079 | ||
1080 | spin_lock_irq(&epfile->ffs->eps_lock); | |
1081 | ||
1082 | if (likely(io_data && io_data->ep && io_data->req)) | |
1083 | value = usb_ep_dequeue(io_data->ep, io_data->req); | |
1084 | else | |
1085 | value = -EINVAL; | |
1086 | ||
1087 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1088 | ||
1089 | return value; | |
1090 | } | |
1091 | ||
70e60d91 | 1092 | static ssize_t ffs_epfile_write_iter(struct kiocb *kiocb, struct iov_iter *from) |
2e4c7553 | 1093 | { |
70e60d91 | 1094 | struct ffs_io_data io_data, *p = &io_data; |
de2080d4 | 1095 | ssize_t res; |
2e4c7553 RB |
1096 | |
1097 | ENTER(); | |
1098 | ||
70e60d91 AV |
1099 | if (!is_sync_kiocb(kiocb)) { |
1100 | p = kmalloc(sizeof(io_data), GFP_KERNEL); | |
1101 | if (unlikely(!p)) | |
1102 | return -ENOMEM; | |
1103 | p->aio = true; | |
1104 | } else { | |
1105 | p->aio = false; | |
1106 | } | |
2e4c7553 | 1107 | |
70e60d91 AV |
1108 | p->read = false; |
1109 | p->kiocb = kiocb; | |
1110 | p->data = *from; | |
1111 | p->mm = current->mm; | |
2e4c7553 | 1112 | |
70e60d91 | 1113 | kiocb->private = p; |
2e4c7553 | 1114 | |
4088acf1 RMS |
1115 | if (p->aio) |
1116 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
2e4c7553 | 1117 | |
70e60d91 AV |
1118 | res = ffs_epfile_io(kiocb->ki_filp, p); |
1119 | if (res == -EIOCBQUEUED) | |
1120 | return res; | |
1121 | if (p->aio) | |
1122 | kfree(p); | |
1123 | else | |
1124 | *from = p->data; | |
de2080d4 | 1125 | return res; |
2e4c7553 RB |
1126 | } |
1127 | ||
70e60d91 | 1128 | static ssize_t ffs_epfile_read_iter(struct kiocb *kiocb, struct iov_iter *to) |
2e4c7553 | 1129 | { |
70e60d91 | 1130 | struct ffs_io_data io_data, *p = &io_data; |
de2080d4 | 1131 | ssize_t res; |
2e4c7553 RB |
1132 | |
1133 | ENTER(); | |
1134 | ||
70e60d91 AV |
1135 | if (!is_sync_kiocb(kiocb)) { |
1136 | p = kmalloc(sizeof(io_data), GFP_KERNEL); | |
1137 | if (unlikely(!p)) | |
1138 | return -ENOMEM; | |
1139 | p->aio = true; | |
1140 | } else { | |
1141 | p->aio = false; | |
2e4c7553 RB |
1142 | } |
1143 | ||
70e60d91 AV |
1144 | p->read = true; |
1145 | p->kiocb = kiocb; | |
1146 | if (p->aio) { | |
1147 | p->to_free = dup_iter(&p->data, to, GFP_KERNEL); | |
1148 | if (!p->to_free) { | |
1149 | kfree(p); | |
1150 | return -ENOMEM; | |
1151 | } | |
1152 | } else { | |
1153 | p->data = *to; | |
1154 | p->to_free = NULL; | |
1155 | } | |
1156 | p->mm = current->mm; | |
2e4c7553 | 1157 | |
70e60d91 | 1158 | kiocb->private = p; |
2e4c7553 | 1159 | |
4088acf1 RMS |
1160 | if (p->aio) |
1161 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
2e4c7553 | 1162 | |
70e60d91 AV |
1163 | res = ffs_epfile_io(kiocb->ki_filp, p); |
1164 | if (res == -EIOCBQUEUED) | |
1165 | return res; | |
1166 | ||
1167 | if (p->aio) { | |
1168 | kfree(p->to_free); | |
1169 | kfree(p); | |
1170 | } else { | |
1171 | *to = p->data; | |
de2080d4 AV |
1172 | } |
1173 | return res; | |
2e4c7553 RB |
1174 | } |
1175 | ||
ddf8abd2 MN |
1176 | static int |
1177 | ffs_epfile_release(struct inode *inode, struct file *file) | |
1178 | { | |
1179 | struct ffs_epfile *epfile = inode->i_private; | |
1180 | ||
1181 | ENTER(); | |
1182 | ||
a9e6f83c | 1183 | __ffs_epfile_read_buffer_free(epfile); |
ddf8abd2 MN |
1184 | ffs_data_closed(epfile->ffs); |
1185 | ||
1186 | return 0; | |
1187 | } | |
1188 | ||
ddf8abd2 MN |
1189 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
1190 | unsigned long value) | |
1191 | { | |
1192 | struct ffs_epfile *epfile = file->private_data; | |
1193 | int ret; | |
1194 | ||
1195 | ENTER(); | |
1196 | ||
1197 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
1198 | return -ENODEV; | |
1199 | ||
1200 | spin_lock_irq(&epfile->ffs->eps_lock); | |
1201 | if (likely(epfile->ep)) { | |
1202 | switch (code) { | |
1203 | case FUNCTIONFS_FIFO_STATUS: | |
1204 | ret = usb_ep_fifo_status(epfile->ep->ep); | |
1205 | break; | |
1206 | case FUNCTIONFS_FIFO_FLUSH: | |
1207 | usb_ep_fifo_flush(epfile->ep->ep); | |
1208 | ret = 0; | |
1209 | break; | |
1210 | case FUNCTIONFS_CLEAR_HALT: | |
1211 | ret = usb_ep_clear_halt(epfile->ep->ep); | |
1212 | break; | |
1213 | case FUNCTIONFS_ENDPOINT_REVMAP: | |
1214 | ret = epfile->ep->num; | |
1215 | break; | |
c559a353 RB |
1216 | case FUNCTIONFS_ENDPOINT_DESC: |
1217 | { | |
1218 | int desc_idx; | |
1219 | struct usb_endpoint_descriptor *desc; | |
1220 | ||
1221 | switch (epfile->ffs->gadget->speed) { | |
1222 | case USB_SPEED_SUPER: | |
1223 | desc_idx = 2; | |
1224 | break; | |
1225 | case USB_SPEED_HIGH: | |
1226 | desc_idx = 1; | |
1227 | break; | |
1228 | default: | |
1229 | desc_idx = 0; | |
1230 | } | |
1231 | desc = epfile->ep->descs[desc_idx]; | |
1232 | ||
1233 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
f199a80c | 1234 | ret = copy_to_user((void *)value, desc, desc->bLength); |
c559a353 RB |
1235 | if (ret) |
1236 | ret = -EFAULT; | |
1237 | return ret; | |
1238 | } | |
ddf8abd2 MN |
1239 | default: |
1240 | ret = -ENOTTY; | |
1241 | } | |
1242 | } else { | |
1243 | ret = -ENODEV; | |
1244 | } | |
1245 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1246 | ||
1247 | return ret; | |
1248 | } | |
1249 | ||
ddf8abd2 | 1250 | static const struct file_operations ffs_epfile_operations = { |
ddf8abd2 MN |
1251 | .llseek = no_llseek, |
1252 | ||
1253 | .open = ffs_epfile_open, | |
70e60d91 AV |
1254 | .write_iter = ffs_epfile_write_iter, |
1255 | .read_iter = ffs_epfile_read_iter, | |
ddf8abd2 MN |
1256 | .release = ffs_epfile_release, |
1257 | .unlocked_ioctl = ffs_epfile_ioctl, | |
1258 | }; | |
1259 | ||
1260 | ||
ddf8abd2 MN |
1261 | /* File system and super block operations ***********************************/ |
1262 | ||
1263 | /* | |
5ab54cf7 | 1264 | * Mounting the file system creates a controller file, used first for |
ddf8abd2 MN |
1265 | * function configuration then later for event monitoring. |
1266 | */ | |
1267 | ||
ddf8abd2 MN |
1268 | static struct inode *__must_check |
1269 | ffs_sb_make_inode(struct super_block *sb, void *data, | |
1270 | const struct file_operations *fops, | |
1271 | const struct inode_operations *iops, | |
1272 | struct ffs_file_perms *perms) | |
1273 | { | |
1274 | struct inode *inode; | |
1275 | ||
1276 | ENTER(); | |
1277 | ||
1278 | inode = new_inode(sb); | |
1279 | ||
1280 | if (likely(inode)) { | |
078cd827 | 1281 | struct timespec ts = current_time(inode); |
ddf8abd2 | 1282 | |
12ba8d1e | 1283 | inode->i_ino = get_next_ino(); |
ddf8abd2 MN |
1284 | inode->i_mode = perms->mode; |
1285 | inode->i_uid = perms->uid; | |
1286 | inode->i_gid = perms->gid; | |
078cd827 DD |
1287 | inode->i_atime = ts; |
1288 | inode->i_mtime = ts; | |
1289 | inode->i_ctime = ts; | |
ddf8abd2 MN |
1290 | inode->i_private = data; |
1291 | if (fops) | |
1292 | inode->i_fop = fops; | |
1293 | if (iops) | |
1294 | inode->i_op = iops; | |
1295 | } | |
1296 | ||
1297 | return inode; | |
1298 | } | |
1299 | ||
ddf8abd2 | 1300 | /* Create "regular" file */ |
1bb27cac | 1301 | static struct dentry *ffs_sb_create_file(struct super_block *sb, |
ddf8abd2 | 1302 | const char *name, void *data, |
1bb27cac | 1303 | const struct file_operations *fops) |
ddf8abd2 MN |
1304 | { |
1305 | struct ffs_data *ffs = sb->s_fs_info; | |
1306 | struct dentry *dentry; | |
1307 | struct inode *inode; | |
1308 | ||
1309 | ENTER(); | |
1310 | ||
1311 | dentry = d_alloc_name(sb->s_root, name); | |
1312 | if (unlikely(!dentry)) | |
1313 | return NULL; | |
1314 | ||
1315 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); | |
1316 | if (unlikely(!inode)) { | |
1317 | dput(dentry); | |
1318 | return NULL; | |
1319 | } | |
1320 | ||
1321 | d_add(dentry, inode); | |
1bb27cac | 1322 | return dentry; |
ddf8abd2 MN |
1323 | } |
1324 | ||
ddf8abd2 | 1325 | /* Super block */ |
ddf8abd2 MN |
1326 | static const struct super_operations ffs_sb_operations = { |
1327 | .statfs = simple_statfs, | |
1328 | .drop_inode = generic_delete_inode, | |
1329 | }; | |
1330 | ||
1331 | struct ffs_sb_fill_data { | |
1332 | struct ffs_file_perms perms; | |
1333 | umode_t root_mode; | |
1334 | const char *dev_name; | |
18d6b32f | 1335 | bool no_disconnect; |
2606b28a | 1336 | struct ffs_data *ffs_data; |
ddf8abd2 MN |
1337 | }; |
1338 | ||
1339 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) | |
1340 | { | |
1341 | struct ffs_sb_fill_data *data = _data; | |
1342 | struct inode *inode; | |
2606b28a | 1343 | struct ffs_data *ffs = data->ffs_data; |
ddf8abd2 MN |
1344 | |
1345 | ENTER(); | |
1346 | ||
ddf8abd2 | 1347 | ffs->sb = sb; |
2606b28a | 1348 | data->ffs_data = NULL; |
ddf8abd2 | 1349 | sb->s_fs_info = ffs; |
09cbfeaf KS |
1350 | sb->s_blocksize = PAGE_SIZE; |
1351 | sb->s_blocksize_bits = PAGE_SHIFT; | |
ddf8abd2 MN |
1352 | sb->s_magic = FUNCTIONFS_MAGIC; |
1353 | sb->s_op = &ffs_sb_operations; | |
1354 | sb->s_time_gran = 1; | |
1355 | ||
1356 | /* Root inode */ | |
1357 | data->perms.mode = data->root_mode; | |
1358 | inode = ffs_sb_make_inode(sb, NULL, | |
1359 | &simple_dir_operations, | |
1360 | &simple_dir_inode_operations, | |
1361 | &data->perms); | |
48fde701 AV |
1362 | sb->s_root = d_make_root(inode); |
1363 | if (unlikely(!sb->s_root)) | |
2606b28a | 1364 | return -ENOMEM; |
ddf8abd2 MN |
1365 | |
1366 | /* EP0 file */ | |
1367 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, | |
1bb27cac | 1368 | &ffs_ep0_operations))) |
2606b28a | 1369 | return -ENOMEM; |
ddf8abd2 MN |
1370 | |
1371 | return 0; | |
ddf8abd2 MN |
1372 | } |
1373 | ||
ddf8abd2 MN |
1374 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
1375 | { | |
1376 | ENTER(); | |
1377 | ||
1378 | if (!opts || !*opts) | |
1379 | return 0; | |
1380 | ||
1381 | for (;;) { | |
ddf8abd2 | 1382 | unsigned long value; |
afd2e186 | 1383 | char *eq, *comma; |
ddf8abd2 MN |
1384 | |
1385 | /* Option limit */ | |
1386 | comma = strchr(opts, ','); | |
1387 | if (comma) | |
1388 | *comma = 0; | |
1389 | ||
1390 | /* Value limit */ | |
1391 | eq = strchr(opts, '='); | |
1392 | if (unlikely(!eq)) { | |
aa02f172 | 1393 | pr_err("'=' missing in %s\n", opts); |
ddf8abd2 MN |
1394 | return -EINVAL; |
1395 | } | |
1396 | *eq = 0; | |
1397 | ||
1398 | /* Parse value */ | |
afd2e186 | 1399 | if (kstrtoul(eq + 1, 0, &value)) { |
aa02f172 | 1400 | pr_err("%s: invalid value: %s\n", opts, eq + 1); |
ddf8abd2 MN |
1401 | return -EINVAL; |
1402 | } | |
1403 | ||
1404 | /* Interpret option */ | |
1405 | switch (eq - opts) { | |
18d6b32f RB |
1406 | case 13: |
1407 | if (!memcmp(opts, "no_disconnect", 13)) | |
1408 | data->no_disconnect = !!value; | |
1409 | else | |
1410 | goto invalid; | |
1411 | break; | |
ddf8abd2 MN |
1412 | case 5: |
1413 | if (!memcmp(opts, "rmode", 5)) | |
1414 | data->root_mode = (value & 0555) | S_IFDIR; | |
1415 | else if (!memcmp(opts, "fmode", 5)) | |
1416 | data->perms.mode = (value & 0666) | S_IFREG; | |
1417 | else | |
1418 | goto invalid; | |
1419 | break; | |
1420 | ||
1421 | case 4: | |
1422 | if (!memcmp(opts, "mode", 4)) { | |
1423 | data->root_mode = (value & 0555) | S_IFDIR; | |
1424 | data->perms.mode = (value & 0666) | S_IFREG; | |
1425 | } else { | |
1426 | goto invalid; | |
1427 | } | |
1428 | break; | |
1429 | ||
1430 | case 3: | |
b9b73f7c EB |
1431 | if (!memcmp(opts, "uid", 3)) { |
1432 | data->perms.uid = make_kuid(current_user_ns(), value); | |
1433 | if (!uid_valid(data->perms.uid)) { | |
1434 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1435 | return -EINVAL; | |
1436 | } | |
b8100750 | 1437 | } else if (!memcmp(opts, "gid", 3)) { |
b9b73f7c EB |
1438 | data->perms.gid = make_kgid(current_user_ns(), value); |
1439 | if (!gid_valid(data->perms.gid)) { | |
1440 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1441 | return -EINVAL; | |
1442 | } | |
b8100750 | 1443 | } else { |
ddf8abd2 | 1444 | goto invalid; |
b8100750 | 1445 | } |
ddf8abd2 MN |
1446 | break; |
1447 | ||
1448 | default: | |
1449 | invalid: | |
aa02f172 | 1450 | pr_err("%s: invalid option\n", opts); |
ddf8abd2 MN |
1451 | return -EINVAL; |
1452 | } | |
1453 | ||
1454 | /* Next iteration */ | |
1455 | if (!comma) | |
1456 | break; | |
1457 | opts = comma + 1; | |
1458 | } | |
1459 | ||
1460 | return 0; | |
1461 | } | |
1462 | ||
ddf8abd2 MN |
1463 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
1464 | ||
fc14f2fe AV |
1465 | static struct dentry * |
1466 | ffs_fs_mount(struct file_system_type *t, int flags, | |
1467 | const char *dev_name, void *opts) | |
ddf8abd2 MN |
1468 | { |
1469 | struct ffs_sb_fill_data data = { | |
1470 | .perms = { | |
1471 | .mode = S_IFREG | 0600, | |
b9b73f7c EB |
1472 | .uid = GLOBAL_ROOT_UID, |
1473 | .gid = GLOBAL_ROOT_GID, | |
ddf8abd2 MN |
1474 | }, |
1475 | .root_mode = S_IFDIR | 0500, | |
18d6b32f | 1476 | .no_disconnect = false, |
ddf8abd2 | 1477 | }; |
581791f5 | 1478 | struct dentry *rv; |
ddf8abd2 | 1479 | int ret; |
581791f5 | 1480 | void *ffs_dev; |
2606b28a | 1481 | struct ffs_data *ffs; |
ddf8abd2 MN |
1482 | |
1483 | ENTER(); | |
1484 | ||
ddf8abd2 MN |
1485 | ret = ffs_fs_parse_opts(&data, opts); |
1486 | if (unlikely(ret < 0)) | |
fc14f2fe | 1487 | return ERR_PTR(ret); |
ddf8abd2 | 1488 | |
2606b28a AV |
1489 | ffs = ffs_data_new(); |
1490 | if (unlikely(!ffs)) | |
1491 | return ERR_PTR(-ENOMEM); | |
1492 | ffs->file_perms = data.perms; | |
18d6b32f | 1493 | ffs->no_disconnect = data.no_disconnect; |
2606b28a AV |
1494 | |
1495 | ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); | |
1496 | if (unlikely(!ffs->dev_name)) { | |
1497 | ffs_data_put(ffs); | |
1498 | return ERR_PTR(-ENOMEM); | |
1499 | } | |
1500 | ||
4b187fce | 1501 | ffs_dev = ffs_acquire_dev(dev_name); |
2606b28a AV |
1502 | if (IS_ERR(ffs_dev)) { |
1503 | ffs_data_put(ffs); | |
1504 | return ERR_CAST(ffs_dev); | |
1505 | } | |
1506 | ffs->private_data = ffs_dev; | |
1507 | data.ffs_data = ffs; | |
581791f5 | 1508 | |
581791f5 | 1509 | rv = mount_nodev(t, flags, &data, ffs_sb_fill); |
2606b28a | 1510 | if (IS_ERR(rv) && data.ffs_data) { |
4b187fce | 1511 | ffs_release_dev(data.ffs_data); |
2606b28a AV |
1512 | ffs_data_put(data.ffs_data); |
1513 | } | |
581791f5 | 1514 | return rv; |
ddf8abd2 MN |
1515 | } |
1516 | ||
1517 | static void | |
1518 | ffs_fs_kill_sb(struct super_block *sb) | |
1519 | { | |
ddf8abd2 MN |
1520 | ENTER(); |
1521 | ||
1522 | kill_litter_super(sb); | |
581791f5 | 1523 | if (sb->s_fs_info) { |
4b187fce | 1524 | ffs_release_dev(sb->s_fs_info); |
18d6b32f | 1525 | ffs_data_closed(sb->s_fs_info); |
5b5f9560 | 1526 | ffs_data_put(sb->s_fs_info); |
581791f5 | 1527 | } |
ddf8abd2 MN |
1528 | } |
1529 | ||
1530 | static struct file_system_type ffs_fs_type = { | |
1531 | .owner = THIS_MODULE, | |
1532 | .name = "functionfs", | |
fc14f2fe | 1533 | .mount = ffs_fs_mount, |
ddf8abd2 MN |
1534 | .kill_sb = ffs_fs_kill_sb, |
1535 | }; | |
7f78e035 | 1536 | MODULE_ALIAS_FS("functionfs"); |
ddf8abd2 MN |
1537 | |
1538 | ||
ddf8abd2 MN |
1539 | /* Driver's main init/cleanup functions *************************************/ |
1540 | ||
ddf8abd2 MN |
1541 | static int functionfs_init(void) |
1542 | { | |
1543 | int ret; | |
1544 | ||
1545 | ENTER(); | |
1546 | ||
1547 | ret = register_filesystem(&ffs_fs_type); | |
1548 | if (likely(!ret)) | |
aa02f172 | 1549 | pr_info("file system registered\n"); |
ddf8abd2 | 1550 | else |
aa02f172 | 1551 | pr_err("failed registering file system (%d)\n", ret); |
ddf8abd2 MN |
1552 | |
1553 | return ret; | |
1554 | } | |
1555 | ||
1556 | static void functionfs_cleanup(void) | |
1557 | { | |
1558 | ENTER(); | |
1559 | ||
aa02f172 | 1560 | pr_info("unloading\n"); |
ddf8abd2 MN |
1561 | unregister_filesystem(&ffs_fs_type); |
1562 | } | |
1563 | ||
1564 | ||
ddf8abd2 MN |
1565 | /* ffs_data and ffs_function construction and destruction code **************/ |
1566 | ||
1567 | static void ffs_data_clear(struct ffs_data *ffs); | |
1568 | static void ffs_data_reset(struct ffs_data *ffs); | |
1569 | ||
ddf8abd2 MN |
1570 | static void ffs_data_get(struct ffs_data *ffs) |
1571 | { | |
1572 | ENTER(); | |
1573 | ||
1574 | atomic_inc(&ffs->ref); | |
1575 | } | |
1576 | ||
1577 | static void ffs_data_opened(struct ffs_data *ffs) | |
1578 | { | |
1579 | ENTER(); | |
1580 | ||
1581 | atomic_inc(&ffs->ref); | |
18d6b32f RB |
1582 | if (atomic_add_return(1, &ffs->opened) == 1 && |
1583 | ffs->state == FFS_DEACTIVATED) { | |
1584 | ffs->state = FFS_CLOSING; | |
1585 | ffs_data_reset(ffs); | |
1586 | } | |
ddf8abd2 MN |
1587 | } |
1588 | ||
1589 | static void ffs_data_put(struct ffs_data *ffs) | |
1590 | { | |
1591 | ENTER(); | |
1592 | ||
1593 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { | |
aa02f172 | 1594 | pr_info("%s(): freeing\n", __func__); |
ddf8abd2 | 1595 | ffs_data_clear(ffs); |
647d5580 | 1596 | BUG_ON(waitqueue_active(&ffs->ev.waitq) || |
ddf8abd2 | 1597 | waitqueue_active(&ffs->ep0req_completion.wait)); |
581791f5 | 1598 | kfree(ffs->dev_name); |
ddf8abd2 MN |
1599 | kfree(ffs); |
1600 | } | |
1601 | } | |
1602 | ||
ddf8abd2 MN |
1603 | static void ffs_data_closed(struct ffs_data *ffs) |
1604 | { | |
1605 | ENTER(); | |
1606 | ||
1607 | if (atomic_dec_and_test(&ffs->opened)) { | |
18d6b32f RB |
1608 | if (ffs->no_disconnect) { |
1609 | ffs->state = FFS_DEACTIVATED; | |
1610 | if (ffs->epfiles) { | |
1611 | ffs_epfiles_destroy(ffs->epfiles, | |
1612 | ffs->eps_count); | |
1613 | ffs->epfiles = NULL; | |
1614 | } | |
1615 | if (ffs->setup_state == FFS_SETUP_PENDING) | |
1616 | __ffs_ep0_stall(ffs); | |
1617 | } else { | |
1618 | ffs->state = FFS_CLOSING; | |
1619 | ffs_data_reset(ffs); | |
1620 | } | |
1621 | } | |
1622 | if (atomic_read(&ffs->opened) < 0) { | |
ddf8abd2 MN |
1623 | ffs->state = FFS_CLOSING; |
1624 | ffs_data_reset(ffs); | |
1625 | } | |
1626 | ||
1627 | ffs_data_put(ffs); | |
1628 | } | |
1629 | ||
ddf8abd2 MN |
1630 | static struct ffs_data *ffs_data_new(void) |
1631 | { | |
1632 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); | |
1633 | if (unlikely(!ffs)) | |
f8800d47 | 1634 | return NULL; |
ddf8abd2 MN |
1635 | |
1636 | ENTER(); | |
1637 | ||
1638 | atomic_set(&ffs->ref, 1); | |
1639 | atomic_set(&ffs->opened, 0); | |
1640 | ffs->state = FFS_READ_DESCRIPTORS; | |
1641 | mutex_init(&ffs->mutex); | |
1642 | spin_lock_init(&ffs->eps_lock); | |
1643 | init_waitqueue_head(&ffs->ev.waitq); | |
1644 | init_completion(&ffs->ep0req_completion); | |
1645 | ||
1646 | /* XXX REVISIT need to update it in some places, or do we? */ | |
1647 | ffs->ev.can_stall = 1; | |
1648 | ||
1649 | return ffs; | |
1650 | } | |
1651 | ||
ddf8abd2 MN |
1652 | static void ffs_data_clear(struct ffs_data *ffs) |
1653 | { | |
1654 | ENTER(); | |
1655 | ||
49a79d8b | 1656 | ffs_closed(ffs); |
ddf8abd2 MN |
1657 | |
1658 | BUG_ON(ffs->gadget); | |
1659 | ||
1660 | if (ffs->epfiles) | |
1661 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); | |
1662 | ||
5e33f6fd RB |
1663 | if (ffs->ffs_eventfd) |
1664 | eventfd_ctx_put(ffs->ffs_eventfd); | |
1665 | ||
ac8dde11 | 1666 | kfree(ffs->raw_descs_data); |
ddf8abd2 MN |
1667 | kfree(ffs->raw_strings); |
1668 | kfree(ffs->stringtabs); | |
1669 | } | |
1670 | ||
ddf8abd2 MN |
1671 | static void ffs_data_reset(struct ffs_data *ffs) |
1672 | { | |
1673 | ENTER(); | |
1674 | ||
1675 | ffs_data_clear(ffs); | |
1676 | ||
1677 | ffs->epfiles = NULL; | |
ac8dde11 | 1678 | ffs->raw_descs_data = NULL; |
ddf8abd2 MN |
1679 | ffs->raw_descs = NULL; |
1680 | ffs->raw_strings = NULL; | |
1681 | ffs->stringtabs = NULL; | |
1682 | ||
1683 | ffs->raw_descs_length = 0; | |
ddf8abd2 MN |
1684 | ffs->fs_descs_count = 0; |
1685 | ffs->hs_descs_count = 0; | |
8d4e897b | 1686 | ffs->ss_descs_count = 0; |
ddf8abd2 MN |
1687 | |
1688 | ffs->strings_count = 0; | |
1689 | ffs->interfaces_count = 0; | |
1690 | ffs->eps_count = 0; | |
1691 | ||
1692 | ffs->ev.count = 0; | |
1693 | ||
1694 | ffs->state = FFS_READ_DESCRIPTORS; | |
1695 | ffs->setup_state = FFS_NO_SETUP; | |
1696 | ffs->flags = 0; | |
1697 | } | |
1698 | ||
1699 | ||
1700 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) | |
1701 | { | |
fd7c9a00 MN |
1702 | struct usb_gadget_strings **lang; |
1703 | int first_id; | |
ddf8abd2 MN |
1704 | |
1705 | ENTER(); | |
1706 | ||
1707 | if (WARN_ON(ffs->state != FFS_ACTIVE | |
1708 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) | |
1709 | return -EBADFD; | |
1710 | ||
fd7c9a00 MN |
1711 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
1712 | if (unlikely(first_id < 0)) | |
1713 | return first_id; | |
ddf8abd2 MN |
1714 | |
1715 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); | |
1716 | if (unlikely(!ffs->ep0req)) | |
1717 | return -ENOMEM; | |
1718 | ffs->ep0req->complete = ffs_ep0_complete; | |
1719 | ffs->ep0req->context = ffs; | |
1720 | ||
fd7c9a00 | 1721 | lang = ffs->stringtabs; |
f0688c8b MN |
1722 | if (lang) { |
1723 | for (; *lang; ++lang) { | |
1724 | struct usb_string *str = (*lang)->strings; | |
1725 | int id = first_id; | |
1726 | for (; str->s; ++id, ++str) | |
1727 | str->id = id; | |
1728 | } | |
ddf8abd2 MN |
1729 | } |
1730 | ||
1731 | ffs->gadget = cdev->gadget; | |
fd7c9a00 | 1732 | ffs_data_get(ffs); |
ddf8abd2 MN |
1733 | return 0; |
1734 | } | |
1735 | ||
ddf8abd2 MN |
1736 | static void functionfs_unbind(struct ffs_data *ffs) |
1737 | { | |
1738 | ENTER(); | |
1739 | ||
1740 | if (!WARN_ON(!ffs->gadget)) { | |
1741 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); | |
1742 | ffs->ep0req = NULL; | |
1743 | ffs->gadget = NULL; | |
e2190a97 | 1744 | clear_bit(FFS_FL_BOUND, &ffs->flags); |
df498995 | 1745 | ffs_data_put(ffs); |
ddf8abd2 MN |
1746 | } |
1747 | } | |
1748 | ||
ddf8abd2 MN |
1749 | static int ffs_epfiles_create(struct ffs_data *ffs) |
1750 | { | |
1751 | struct ffs_epfile *epfile, *epfiles; | |
1752 | unsigned i, count; | |
1753 | ||
1754 | ENTER(); | |
1755 | ||
1756 | count = ffs->eps_count; | |
9823a525 | 1757 | epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL); |
ddf8abd2 MN |
1758 | if (!epfiles) |
1759 | return -ENOMEM; | |
1760 | ||
1761 | epfile = epfiles; | |
1762 | for (i = 1; i <= count; ++i, ++epfile) { | |
1763 | epfile->ffs = ffs; | |
1764 | mutex_init(&epfile->mutex); | |
1765 | init_waitqueue_head(&epfile->wait); | |
1b0bf88f | 1766 | if (ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) |
acba23fe | 1767 | sprintf(epfile->name, "ep%02x", ffs->eps_addrmap[i]); |
1b0bf88f | 1768 | else |
acba23fe MS |
1769 | sprintf(epfile->name, "ep%u", i); |
1770 | epfile->dentry = ffs_sb_create_file(ffs->sb, epfile->name, | |
1bb27cac AV |
1771 | epfile, |
1772 | &ffs_epfile_operations); | |
1773 | if (unlikely(!epfile->dentry)) { | |
ddf8abd2 MN |
1774 | ffs_epfiles_destroy(epfiles, i - 1); |
1775 | return -ENOMEM; | |
1776 | } | |
1777 | } | |
1778 | ||
1779 | ffs->epfiles = epfiles; | |
1780 | return 0; | |
1781 | } | |
1782 | ||
ddf8abd2 MN |
1783 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
1784 | { | |
1785 | struct ffs_epfile *epfile = epfiles; | |
1786 | ||
1787 | ENTER(); | |
1788 | ||
1789 | for (; count; --count, ++epfile) { | |
1790 | BUG_ON(mutex_is_locked(&epfile->mutex) || | |
1791 | waitqueue_active(&epfile->wait)); | |
1792 | if (epfile->dentry) { | |
1793 | d_delete(epfile->dentry); | |
1794 | dput(epfile->dentry); | |
1795 | epfile->dentry = NULL; | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | kfree(epfiles); | |
1800 | } | |
1801 | ||
ddf8abd2 MN |
1802 | static void ffs_func_eps_disable(struct ffs_function *func) |
1803 | { | |
1804 | struct ffs_ep *ep = func->eps; | |
1805 | struct ffs_epfile *epfile = func->ffs->epfiles; | |
1806 | unsigned count = func->ffs->eps_count; | |
1807 | unsigned long flags; | |
1808 | ||
a9e6f83c | 1809 | spin_lock_irqsave(&func->ffs->eps_lock, flags); |
08f37148 | 1810 | while (count--) { |
ddf8abd2 MN |
1811 | /* pending requests get nuked */ |
1812 | if (likely(ep->ep)) | |
1813 | usb_ep_disable(ep->ep); | |
ddf8abd2 | 1814 | ++ep; |
18d6b32f RB |
1815 | |
1816 | if (epfile) { | |
a9e6f83c MN |
1817 | epfile->ep = NULL; |
1818 | __ffs_epfile_read_buffer_free(epfile); | |
18d6b32f RB |
1819 | ++epfile; |
1820 | } | |
08f37148 | 1821 | } |
a9e6f83c | 1822 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); |
ddf8abd2 MN |
1823 | } |
1824 | ||
1825 | static int ffs_func_eps_enable(struct ffs_function *func) | |
1826 | { | |
1827 | struct ffs_data *ffs = func->ffs; | |
1828 | struct ffs_ep *ep = func->eps; | |
1829 | struct ffs_epfile *epfile = ffs->epfiles; | |
1830 | unsigned count = ffs->eps_count; | |
1831 | unsigned long flags; | |
1832 | int ret = 0; | |
1833 | ||
1834 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
08f37148 | 1835 | while(count--) { |
ddf8abd2 | 1836 | struct usb_endpoint_descriptor *ds; |
2bfa0719 FB |
1837 | struct usb_ss_ep_comp_descriptor *comp_desc = NULL; |
1838 | int needs_comp_desc = false; | |
8d4e897b MG |
1839 | int desc_idx; |
1840 | ||
2bfa0719 | 1841 | if (ffs->gadget->speed == USB_SPEED_SUPER) { |
8d4e897b | 1842 | desc_idx = 2; |
2bfa0719 FB |
1843 | needs_comp_desc = true; |
1844 | } else if (ffs->gadget->speed == USB_SPEED_HIGH) | |
8d4e897b MG |
1845 | desc_idx = 1; |
1846 | else | |
1847 | desc_idx = 0; | |
1848 | ||
1849 | /* fall-back to lower speed if desc missing for current speed */ | |
1850 | do { | |
1851 | ds = ep->descs[desc_idx]; | |
1852 | } while (!ds && --desc_idx >= 0); | |
1853 | ||
1854 | if (!ds) { | |
1855 | ret = -EINVAL; | |
1856 | break; | |
1857 | } | |
ddf8abd2 MN |
1858 | |
1859 | ep->ep->driver_data = ep; | |
72c973dd | 1860 | ep->ep->desc = ds; |
2bfa0719 FB |
1861 | |
1862 | comp_desc = (struct usb_ss_ep_comp_descriptor *)(ds + | |
1863 | USB_DT_ENDPOINT_SIZE); | |
1864 | ep->ep->maxburst = comp_desc->bMaxBurst + 1; | |
1865 | ||
1866 | if (needs_comp_desc) | |
1867 | ep->ep->comp_desc = comp_desc; | |
1868 | ||
72c973dd | 1869 | ret = usb_ep_enable(ep->ep); |
ddf8abd2 MN |
1870 | if (likely(!ret)) { |
1871 | epfile->ep = ep; | |
1872 | epfile->in = usb_endpoint_dir_in(ds); | |
1873 | epfile->isoc = usb_endpoint_xfer_isoc(ds); | |
1874 | } else { | |
1875 | break; | |
1876 | } | |
1877 | ||
1878 | wake_up(&epfile->wait); | |
1879 | ||
1880 | ++ep; | |
1881 | ++epfile; | |
08f37148 | 1882 | } |
ddf8abd2 MN |
1883 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); |
1884 | ||
1885 | return ret; | |
1886 | } | |
1887 | ||
1888 | ||
1889 | /* Parsing and building descriptors and strings *****************************/ | |
1890 | ||
5ab54cf7 MN |
1891 | /* |
1892 | * This validates if data pointed by data is a valid USB descriptor as | |
ddf8abd2 | 1893 | * well as record how many interfaces, endpoints and strings are |
5ab54cf7 MN |
1894 | * required by given configuration. Returns address after the |
1895 | * descriptor or NULL if data is invalid. | |
1896 | */ | |
ddf8abd2 MN |
1897 | |
1898 | enum ffs_entity_type { | |
1899 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT | |
1900 | }; | |
1901 | ||
f0175ab5 AP |
1902 | enum ffs_os_desc_type { |
1903 | FFS_OS_DESC, FFS_OS_DESC_EXT_COMPAT, FFS_OS_DESC_EXT_PROP | |
1904 | }; | |
1905 | ||
ddf8abd2 MN |
1906 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, |
1907 | u8 *valuep, | |
1908 | struct usb_descriptor_header *desc, | |
1909 | void *priv); | |
1910 | ||
f0175ab5 AP |
1911 | typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, |
1912 | struct usb_os_desc_header *h, void *data, | |
1913 | unsigned len, void *priv); | |
1914 | ||
f96cbd14 AP |
1915 | static int __must_check ffs_do_single_desc(char *data, unsigned len, |
1916 | ffs_entity_callback entity, | |
1917 | void *priv) | |
ddf8abd2 MN |
1918 | { |
1919 | struct usb_descriptor_header *_ds = (void *)data; | |
1920 | u8 length; | |
1921 | int ret; | |
1922 | ||
1923 | ENTER(); | |
1924 | ||
1925 | /* At least two bytes are required: length and type */ | |
1926 | if (len < 2) { | |
aa02f172 | 1927 | pr_vdebug("descriptor too short\n"); |
ddf8abd2 MN |
1928 | return -EINVAL; |
1929 | } | |
1930 | ||
1931 | /* If we have at least as many bytes as the descriptor takes? */ | |
1932 | length = _ds->bLength; | |
1933 | if (len < length) { | |
aa02f172 | 1934 | pr_vdebug("descriptor longer then available data\n"); |
ddf8abd2 MN |
1935 | return -EINVAL; |
1936 | } | |
1937 | ||
1938 | #define __entity_check_INTERFACE(val) 1 | |
1939 | #define __entity_check_STRING(val) (val) | |
1940 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) | |
1941 | #define __entity(type, val) do { \ | |
aa02f172 | 1942 | pr_vdebug("entity " #type "(%02x)\n", (val)); \ |
ddf8abd2 | 1943 | if (unlikely(!__entity_check_ ##type(val))) { \ |
aa02f172 | 1944 | pr_vdebug("invalid entity's value\n"); \ |
ddf8abd2 MN |
1945 | return -EINVAL; \ |
1946 | } \ | |
1947 | ret = entity(FFS_ ##type, &val, _ds, priv); \ | |
1948 | if (unlikely(ret < 0)) { \ | |
aa02f172 | 1949 | pr_debug("entity " #type "(%02x); ret = %d\n", \ |
d8df0b61 | 1950 | (val), ret); \ |
ddf8abd2 MN |
1951 | return ret; \ |
1952 | } \ | |
1953 | } while (0) | |
1954 | ||
1955 | /* Parse descriptor depending on type. */ | |
1956 | switch (_ds->bDescriptorType) { | |
1957 | case USB_DT_DEVICE: | |
1958 | case USB_DT_CONFIG: | |
1959 | case USB_DT_STRING: | |
1960 | case USB_DT_DEVICE_QUALIFIER: | |
1961 | /* function can't have any of those */ | |
aa02f172 | 1962 | pr_vdebug("descriptor reserved for gadget: %d\n", |
5ab54cf7 | 1963 | _ds->bDescriptorType); |
ddf8abd2 MN |
1964 | return -EINVAL; |
1965 | ||
1966 | case USB_DT_INTERFACE: { | |
1967 | struct usb_interface_descriptor *ds = (void *)_ds; | |
aa02f172 | 1968 | pr_vdebug("interface descriptor\n"); |
ddf8abd2 MN |
1969 | if (length != sizeof *ds) |
1970 | goto inv_length; | |
1971 | ||
1972 | __entity(INTERFACE, ds->bInterfaceNumber); | |
1973 | if (ds->iInterface) | |
1974 | __entity(STRING, ds->iInterface); | |
1975 | } | |
1976 | break; | |
1977 | ||
1978 | case USB_DT_ENDPOINT: { | |
1979 | struct usb_endpoint_descriptor *ds = (void *)_ds; | |
aa02f172 | 1980 | pr_vdebug("endpoint descriptor\n"); |
ddf8abd2 MN |
1981 | if (length != USB_DT_ENDPOINT_SIZE && |
1982 | length != USB_DT_ENDPOINT_AUDIO_SIZE) | |
1983 | goto inv_length; | |
1984 | __entity(ENDPOINT, ds->bEndpointAddress); | |
1985 | } | |
1986 | break; | |
1987 | ||
560f1187 KB |
1988 | case HID_DT_HID: |
1989 | pr_vdebug("hid descriptor\n"); | |
1990 | if (length != sizeof(struct hid_descriptor)) | |
1991 | goto inv_length; | |
1992 | break; | |
1993 | ||
ddf8abd2 MN |
1994 | case USB_DT_OTG: |
1995 | if (length != sizeof(struct usb_otg_descriptor)) | |
1996 | goto inv_length; | |
1997 | break; | |
1998 | ||
1999 | case USB_DT_INTERFACE_ASSOCIATION: { | |
2000 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; | |
aa02f172 | 2001 | pr_vdebug("interface association descriptor\n"); |
ddf8abd2 MN |
2002 | if (length != sizeof *ds) |
2003 | goto inv_length; | |
2004 | if (ds->iFunction) | |
2005 | __entity(STRING, ds->iFunction); | |
2006 | } | |
2007 | break; | |
2008 | ||
8d4e897b MG |
2009 | case USB_DT_SS_ENDPOINT_COMP: |
2010 | pr_vdebug("EP SS companion descriptor\n"); | |
2011 | if (length != sizeof(struct usb_ss_ep_comp_descriptor)) | |
2012 | goto inv_length; | |
2013 | break; | |
2014 | ||
ddf8abd2 MN |
2015 | case USB_DT_OTHER_SPEED_CONFIG: |
2016 | case USB_DT_INTERFACE_POWER: | |
2017 | case USB_DT_DEBUG: | |
2018 | case USB_DT_SECURITY: | |
2019 | case USB_DT_CS_RADIO_CONTROL: | |
2020 | /* TODO */ | |
aa02f172 | 2021 | pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
2022 | return -EINVAL; |
2023 | ||
2024 | default: | |
2025 | /* We should never be here */ | |
aa02f172 | 2026 | pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
2027 | return -EINVAL; |
2028 | ||
5ab54cf7 | 2029 | inv_length: |
aa02f172 | 2030 | pr_vdebug("invalid length: %d (descriptor %d)\n", |
d8df0b61 | 2031 | _ds->bLength, _ds->bDescriptorType); |
ddf8abd2 MN |
2032 | return -EINVAL; |
2033 | } | |
2034 | ||
2035 | #undef __entity | |
2036 | #undef __entity_check_DESCRIPTOR | |
2037 | #undef __entity_check_INTERFACE | |
2038 | #undef __entity_check_STRING | |
2039 | #undef __entity_check_ENDPOINT | |
2040 | ||
2041 | return length; | |
2042 | } | |
2043 | ||
ddf8abd2 MN |
2044 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
2045 | ffs_entity_callback entity, void *priv) | |
2046 | { | |
2047 | const unsigned _len = len; | |
2048 | unsigned long num = 0; | |
2049 | ||
2050 | ENTER(); | |
2051 | ||
2052 | for (;;) { | |
2053 | int ret; | |
2054 | ||
2055 | if (num == count) | |
2056 | data = NULL; | |
2057 | ||
5ab54cf7 | 2058 | /* Record "descriptor" entity */ |
ddf8abd2 MN |
2059 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
2060 | if (unlikely(ret < 0)) { | |
aa02f172 | 2061 | pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", |
d8df0b61 | 2062 | num, ret); |
ddf8abd2 MN |
2063 | return ret; |
2064 | } | |
2065 | ||
2066 | if (!data) | |
2067 | return _len - len; | |
2068 | ||
f96cbd14 | 2069 | ret = ffs_do_single_desc(data, len, entity, priv); |
ddf8abd2 | 2070 | if (unlikely(ret < 0)) { |
aa02f172 | 2071 | pr_debug("%s returns %d\n", __func__, ret); |
ddf8abd2 MN |
2072 | return ret; |
2073 | } | |
2074 | ||
2075 | len -= ret; | |
2076 | data += ret; | |
2077 | ++num; | |
2078 | } | |
2079 | } | |
2080 | ||
ddf8abd2 MN |
2081 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
2082 | u8 *valuep, struct usb_descriptor_header *desc, | |
2083 | void *priv) | |
2084 | { | |
6d5c1c77 RB |
2085 | struct ffs_desc_helper *helper = priv; |
2086 | struct usb_endpoint_descriptor *d; | |
ddf8abd2 MN |
2087 | |
2088 | ENTER(); | |
2089 | ||
2090 | switch (type) { | |
2091 | case FFS_DESCRIPTOR: | |
2092 | break; | |
2093 | ||
2094 | case FFS_INTERFACE: | |
5ab54cf7 MN |
2095 | /* |
2096 | * Interfaces are indexed from zero so if we | |
ddf8abd2 | 2097 | * encountered interface "n" then there are at least |
5ab54cf7 MN |
2098 | * "n+1" interfaces. |
2099 | */ | |
6d5c1c77 RB |
2100 | if (*valuep >= helper->interfaces_count) |
2101 | helper->interfaces_count = *valuep + 1; | |
ddf8abd2 MN |
2102 | break; |
2103 | ||
2104 | case FFS_STRING: | |
5ab54cf7 | 2105 | /* |
96a420d2 VP |
2106 | * Strings are indexed from 1 (0 is reserved |
2107 | * for languages list) | |
5ab54cf7 | 2108 | */ |
6d5c1c77 RB |
2109 | if (*valuep > helper->ffs->strings_count) |
2110 | helper->ffs->strings_count = *valuep; | |
ddf8abd2 MN |
2111 | break; |
2112 | ||
2113 | case FFS_ENDPOINT: | |
6d5c1c77 RB |
2114 | d = (void *)desc; |
2115 | helper->eps_count++; | |
41dc9ac1 | 2116 | if (helper->eps_count >= FFS_MAX_EPS_COUNT) |
6d5c1c77 RB |
2117 | return -EINVAL; |
2118 | /* Check if descriptors for any speed were already parsed */ | |
2119 | if (!helper->ffs->eps_count && !helper->ffs->interfaces_count) | |
2120 | helper->ffs->eps_addrmap[helper->eps_count] = | |
2121 | d->bEndpointAddress; | |
2122 | else if (helper->ffs->eps_addrmap[helper->eps_count] != | |
2123 | d->bEndpointAddress) | |
2124 | return -EINVAL; | |
ddf8abd2 MN |
2125 | break; |
2126 | } | |
2127 | ||
2128 | return 0; | |
2129 | } | |
2130 | ||
f0175ab5 AP |
2131 | static int __ffs_do_os_desc_header(enum ffs_os_desc_type *next_type, |
2132 | struct usb_os_desc_header *desc) | |
2133 | { | |
2134 | u16 bcd_version = le16_to_cpu(desc->bcdVersion); | |
2135 | u16 w_index = le16_to_cpu(desc->wIndex); | |
2136 | ||
2137 | if (bcd_version != 1) { | |
2138 | pr_vdebug("unsupported os descriptors version: %d", | |
2139 | bcd_version); | |
2140 | return -EINVAL; | |
2141 | } | |
2142 | switch (w_index) { | |
2143 | case 0x4: | |
2144 | *next_type = FFS_OS_DESC_EXT_COMPAT; | |
2145 | break; | |
2146 | case 0x5: | |
2147 | *next_type = FFS_OS_DESC_EXT_PROP; | |
2148 | break; | |
2149 | default: | |
2150 | pr_vdebug("unsupported os descriptor type: %d", w_index); | |
2151 | return -EINVAL; | |
2152 | } | |
2153 | ||
2154 | return sizeof(*desc); | |
2155 | } | |
2156 | ||
2157 | /* | |
2158 | * Process all extended compatibility/extended property descriptors | |
2159 | * of a feature descriptor | |
2160 | */ | |
2161 | static int __must_check ffs_do_single_os_desc(char *data, unsigned len, | |
2162 | enum ffs_os_desc_type type, | |
2163 | u16 feature_count, | |
2164 | ffs_os_desc_callback entity, | |
2165 | void *priv, | |
2166 | struct usb_os_desc_header *h) | |
2167 | { | |
2168 | int ret; | |
2169 | const unsigned _len = len; | |
2170 | ||
2171 | ENTER(); | |
2172 | ||
2173 | /* loop over all ext compat/ext prop descriptors */ | |
2174 | while (feature_count--) { | |
2175 | ret = entity(type, h, data, len, priv); | |
2176 | if (unlikely(ret < 0)) { | |
2177 | pr_debug("bad OS descriptor, type: %d\n", type); | |
2178 | return ret; | |
2179 | } | |
2180 | data += ret; | |
2181 | len -= ret; | |
2182 | } | |
2183 | return _len - len; | |
2184 | } | |
2185 | ||
2186 | /* Process a number of complete Feature Descriptors (Ext Compat or Ext Prop) */ | |
2187 | static int __must_check ffs_do_os_descs(unsigned count, | |
2188 | char *data, unsigned len, | |
2189 | ffs_os_desc_callback entity, void *priv) | |
2190 | { | |
2191 | const unsigned _len = len; | |
2192 | unsigned long num = 0; | |
2193 | ||
2194 | ENTER(); | |
2195 | ||
2196 | for (num = 0; num < count; ++num) { | |
2197 | int ret; | |
2198 | enum ffs_os_desc_type type; | |
2199 | u16 feature_count; | |
2200 | struct usb_os_desc_header *desc = (void *)data; | |
2201 | ||
2202 | if (len < sizeof(*desc)) | |
2203 | return -EINVAL; | |
2204 | ||
2205 | /* | |
2206 | * Record "descriptor" entity. | |
2207 | * Process dwLength, bcdVersion, wIndex, get b/wCount. | |
2208 | * Move the data pointer to the beginning of extended | |
2209 | * compatibilities proper or extended properties proper | |
2210 | * portions of the data | |
2211 | */ | |
2212 | if (le32_to_cpu(desc->dwLength) > len) | |
2213 | return -EINVAL; | |
2214 | ||
2215 | ret = __ffs_do_os_desc_header(&type, desc); | |
2216 | if (unlikely(ret < 0)) { | |
2217 | pr_debug("entity OS_DESCRIPTOR(%02lx); ret = %d\n", | |
2218 | num, ret); | |
2219 | return ret; | |
2220 | } | |
2221 | /* | |
2222 | * 16-bit hex "?? 00" Little Endian looks like 8-bit hex "??" | |
2223 | */ | |
2224 | feature_count = le16_to_cpu(desc->wCount); | |
2225 | if (type == FFS_OS_DESC_EXT_COMPAT && | |
2226 | (feature_count > 255 || desc->Reserved)) | |
2227 | return -EINVAL; | |
2228 | len -= ret; | |
2229 | data += ret; | |
2230 | ||
2231 | /* | |
2232 | * Process all function/property descriptors | |
2233 | * of this Feature Descriptor | |
2234 | */ | |
2235 | ret = ffs_do_single_os_desc(data, len, type, | |
2236 | feature_count, entity, priv, desc); | |
2237 | if (unlikely(ret < 0)) { | |
2238 | pr_debug("%s returns %d\n", __func__, ret); | |
2239 | return ret; | |
2240 | } | |
2241 | ||
2242 | len -= ret; | |
2243 | data += ret; | |
2244 | } | |
2245 | return _len - len; | |
2246 | } | |
2247 | ||
2248 | /** | |
2249 | * Validate contents of the buffer from userspace related to OS descriptors. | |
2250 | */ | |
2251 | static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, | |
2252 | struct usb_os_desc_header *h, void *data, | |
2253 | unsigned len, void *priv) | |
2254 | { | |
2255 | struct ffs_data *ffs = priv; | |
2256 | u8 length; | |
2257 | ||
2258 | ENTER(); | |
2259 | ||
2260 | switch (type) { | |
2261 | case FFS_OS_DESC_EXT_COMPAT: { | |
2262 | struct usb_ext_compat_desc *d = data; | |
2263 | int i; | |
2264 | ||
2265 | if (len < sizeof(*d) || | |
2266 | d->bFirstInterfaceNumber >= ffs->interfaces_count || | |
3ba534df | 2267 | !d->Reserved1) |
f0175ab5 AP |
2268 | return -EINVAL; |
2269 | for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) | |
2270 | if (d->Reserved2[i]) | |
2271 | return -EINVAL; | |
2272 | ||
2273 | length = sizeof(struct usb_ext_compat_desc); | |
2274 | } | |
2275 | break; | |
2276 | case FFS_OS_DESC_EXT_PROP: { | |
2277 | struct usb_ext_prop_desc *d = data; | |
2278 | u32 type, pdl; | |
2279 | u16 pnl; | |
2280 | ||
2281 | if (len < sizeof(*d) || h->interface >= ffs->interfaces_count) | |
2282 | return -EINVAL; | |
2283 | length = le32_to_cpu(d->dwSize); | |
83e526f2 VP |
2284 | if (len < length) |
2285 | return -EINVAL; | |
f0175ab5 AP |
2286 | type = le32_to_cpu(d->dwPropertyDataType); |
2287 | if (type < USB_EXT_PROP_UNICODE || | |
2288 | type > USB_EXT_PROP_UNICODE_MULTI) { | |
2289 | pr_vdebug("unsupported os descriptor property type: %d", | |
2290 | type); | |
2291 | return -EINVAL; | |
2292 | } | |
2293 | pnl = le16_to_cpu(d->wPropertyNameLength); | |
83e526f2 VP |
2294 | if (length < 14 + pnl) { |
2295 | pr_vdebug("invalid os descriptor length: %d pnl:%d (descriptor %d)\n", | |
2296 | length, pnl, type); | |
2297 | return -EINVAL; | |
2298 | } | |
f0175ab5 AP |
2299 | pdl = le32_to_cpu(*(u32 *)((u8 *)data + 10 + pnl)); |
2300 | if (length != 14 + pnl + pdl) { | |
2301 | pr_vdebug("invalid os descriptor length: %d pnl:%d pdl:%d (descriptor %d)\n", | |
2302 | length, pnl, pdl, type); | |
2303 | return -EINVAL; | |
2304 | } | |
2305 | ++ffs->ms_os_descs_ext_prop_count; | |
2306 | /* property name reported to the host as "WCHAR"s */ | |
2307 | ffs->ms_os_descs_ext_prop_name_len += pnl * 2; | |
2308 | ffs->ms_os_descs_ext_prop_data_len += pdl; | |
2309 | } | |
2310 | break; | |
2311 | default: | |
2312 | pr_vdebug("unknown descriptor: %d\n", type); | |
2313 | return -EINVAL; | |
2314 | } | |
2315 | return length; | |
2316 | } | |
2317 | ||
ddf8abd2 MN |
2318 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
2319 | char *const _data, size_t len) | |
2320 | { | |
ac8dde11 | 2321 | char *data = _data, *raw_descs; |
f0175ab5 | 2322 | unsigned os_descs_count = 0, counts[3], flags; |
ac8dde11 | 2323 | int ret = -EINVAL, i; |
6d5c1c77 | 2324 | struct ffs_desc_helper helper; |
ddf8abd2 MN |
2325 | |
2326 | ENTER(); | |
2327 | ||
ac8dde11 | 2328 | if (get_unaligned_le32(data + 4) != len) |
ddf8abd2 | 2329 | goto error; |
ddf8abd2 | 2330 | |
ac8dde11 MN |
2331 | switch (get_unaligned_le32(data)) { |
2332 | case FUNCTIONFS_DESCRIPTORS_MAGIC: | |
2333 | flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; | |
2334 | data += 8; | |
2335 | len -= 8; | |
2336 | break; | |
2337 | case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: | |
2338 | flags = get_unaligned_le32(data + 8); | |
1b0bf88f | 2339 | ffs->user_flags = flags; |
ac8dde11 MN |
2340 | if (flags & ~(FUNCTIONFS_HAS_FS_DESC | |
2341 | FUNCTIONFS_HAS_HS_DESC | | |
f0175ab5 | 2342 | FUNCTIONFS_HAS_SS_DESC | |
1b0bf88f | 2343 | FUNCTIONFS_HAS_MS_OS_DESC | |
5e33f6fd | 2344 | FUNCTIONFS_VIRTUAL_ADDR | |
54dfce6d | 2345 | FUNCTIONFS_EVENTFD | |
4368c28a FH |
2346 | FUNCTIONFS_ALL_CTRL_RECIP | |
2347 | FUNCTIONFS_CONFIG0_SETUP)) { | |
ac8dde11 | 2348 | ret = -ENOSYS; |
ddf8abd2 MN |
2349 | goto error; |
2350 | } | |
ac8dde11 MN |
2351 | data += 12; |
2352 | len -= 12; | |
2353 | break; | |
2354 | default: | |
2355 | goto error; | |
ddf8abd2 | 2356 | } |
ddf8abd2 | 2357 | |
5e33f6fd RB |
2358 | if (flags & FUNCTIONFS_EVENTFD) { |
2359 | if (len < 4) | |
2360 | goto error; | |
2361 | ffs->ffs_eventfd = | |
2362 | eventfd_ctx_fdget((int)get_unaligned_le32(data)); | |
2363 | if (IS_ERR(ffs->ffs_eventfd)) { | |
2364 | ret = PTR_ERR(ffs->ffs_eventfd); | |
2365 | ffs->ffs_eventfd = NULL; | |
2366 | goto error; | |
2367 | } | |
2368 | data += 4; | |
2369 | len -= 4; | |
2370 | } | |
2371 | ||
ac8dde11 MN |
2372 | /* Read fs_count, hs_count and ss_count (if present) */ |
2373 | for (i = 0; i < 3; ++i) { | |
2374 | if (!(flags & (1 << i))) { | |
2375 | counts[i] = 0; | |
2376 | } else if (len < 4) { | |
8d4e897b | 2377 | goto error; |
ac8dde11 MN |
2378 | } else { |
2379 | counts[i] = get_unaligned_le32(data); | |
2380 | data += 4; | |
2381 | len -= 4; | |
8d4e897b | 2382 | } |
ddf8abd2 | 2383 | } |
f0175ab5 | 2384 | if (flags & (1 << i)) { |
83e526f2 VP |
2385 | if (len < 4) { |
2386 | goto error; | |
2387 | } | |
f0175ab5 AP |
2388 | os_descs_count = get_unaligned_le32(data); |
2389 | data += 4; | |
2390 | len -= 4; | |
2391 | }; | |
ddf8abd2 | 2392 | |
ac8dde11 MN |
2393 | /* Read descriptors */ |
2394 | raw_descs = data; | |
6d5c1c77 | 2395 | helper.ffs = ffs; |
ac8dde11 MN |
2396 | for (i = 0; i < 3; ++i) { |
2397 | if (!counts[i]) | |
2398 | continue; | |
6d5c1c77 RB |
2399 | helper.interfaces_count = 0; |
2400 | helper.eps_count = 0; | |
ac8dde11 | 2401 | ret = ffs_do_descs(counts[i], data, len, |
6d5c1c77 | 2402 | __ffs_data_do_entity, &helper); |
ac8dde11 | 2403 | if (ret < 0) |
ddf8abd2 | 2404 | goto error; |
6d5c1c77 RB |
2405 | if (!ffs->eps_count && !ffs->interfaces_count) { |
2406 | ffs->eps_count = helper.eps_count; | |
2407 | ffs->interfaces_count = helper.interfaces_count; | |
2408 | } else { | |
2409 | if (ffs->eps_count != helper.eps_count) { | |
2410 | ret = -EINVAL; | |
2411 | goto error; | |
2412 | } | |
2413 | if (ffs->interfaces_count != helper.interfaces_count) { | |
2414 | ret = -EINVAL; | |
2415 | goto error; | |
2416 | } | |
2417 | } | |
ac8dde11 MN |
2418 | data += ret; |
2419 | len -= ret; | |
ddf8abd2 | 2420 | } |
f0175ab5 AP |
2421 | if (os_descs_count) { |
2422 | ret = ffs_do_os_descs(os_descs_count, data, len, | |
2423 | __ffs_data_do_os_desc, ffs); | |
2424 | if (ret < 0) | |
2425 | goto error; | |
2426 | data += ret; | |
2427 | len -= ret; | |
2428 | } | |
ddf8abd2 | 2429 | |
ac8dde11 MN |
2430 | if (raw_descs == data || len) { |
2431 | ret = -EINVAL; | |
2432 | goto error; | |
2433 | } | |
ddf8abd2 | 2434 | |
ac8dde11 MN |
2435 | ffs->raw_descs_data = _data; |
2436 | ffs->raw_descs = raw_descs; | |
2437 | ffs->raw_descs_length = data - raw_descs; | |
2438 | ffs->fs_descs_count = counts[0]; | |
2439 | ffs->hs_descs_count = counts[1]; | |
2440 | ffs->ss_descs_count = counts[2]; | |
f0175ab5 | 2441 | ffs->ms_os_descs_count = os_descs_count; |
ddf8abd2 MN |
2442 | |
2443 | return 0; | |
2444 | ||
ddf8abd2 MN |
2445 | error: |
2446 | kfree(_data); | |
2447 | return ret; | |
2448 | } | |
2449 | ||
ddf8abd2 MN |
2450 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
2451 | char *const _data, size_t len) | |
2452 | { | |
2453 | u32 str_count, needed_count, lang_count; | |
2454 | struct usb_gadget_strings **stringtabs, *t; | |
ddf8abd2 | 2455 | const char *data = _data; |
872ce511 | 2456 | struct usb_string *s; |
ddf8abd2 MN |
2457 | |
2458 | ENTER(); | |
2459 | ||
83e526f2 VP |
2460 | if (unlikely(len < 16 || |
2461 | get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || | |
ddf8abd2 MN |
2462 | get_unaligned_le32(data + 4) != len)) |
2463 | goto error; | |
2464 | str_count = get_unaligned_le32(data + 8); | |
2465 | lang_count = get_unaligned_le32(data + 12); | |
2466 | ||
2467 | /* if one is zero the other must be zero */ | |
2468 | if (unlikely(!str_count != !lang_count)) | |
2469 | goto error; | |
2470 | ||
2471 | /* Do we have at least as many strings as descriptors need? */ | |
2472 | needed_count = ffs->strings_count; | |
2473 | if (unlikely(str_count < needed_count)) | |
2474 | goto error; | |
2475 | ||
5ab54cf7 MN |
2476 | /* |
2477 | * If we don't need any strings just return and free all | |
2478 | * memory. | |
2479 | */ | |
ddf8abd2 MN |
2480 | if (!needed_count) { |
2481 | kfree(_data); | |
2482 | return 0; | |
2483 | } | |
2484 | ||
5ab54cf7 | 2485 | /* Allocate everything in one chunk so there's less maintenance. */ |
ddf8abd2 | 2486 | { |
ddf8abd2 | 2487 | unsigned i = 0; |
e6f3862f AP |
2488 | vla_group(d); |
2489 | vla_item(d, struct usb_gadget_strings *, stringtabs, | |
2490 | lang_count + 1); | |
2491 | vla_item(d, struct usb_gadget_strings, stringtab, lang_count); | |
2492 | vla_item(d, struct usb_string, strings, | |
2493 | lang_count*(needed_count+1)); | |
ddf8abd2 | 2494 | |
e6f3862f AP |
2495 | char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); |
2496 | ||
2497 | if (unlikely(!vlabuf)) { | |
ddf8abd2 MN |
2498 | kfree(_data); |
2499 | return -ENOMEM; | |
2500 | } | |
2501 | ||
e6f3862f AP |
2502 | /* Initialize the VLA pointers */ |
2503 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2504 | t = vla_ptr(vlabuf, d, stringtab); | |
ddf8abd2 MN |
2505 | i = lang_count; |
2506 | do { | |
2507 | *stringtabs++ = t++; | |
2508 | } while (--i); | |
2509 | *stringtabs = NULL; | |
2510 | ||
e6f3862f AP |
2511 | /* stringtabs = vlabuf = d_stringtabs for later kfree */ |
2512 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2513 | t = vla_ptr(vlabuf, d, stringtab); | |
2514 | s = vla_ptr(vlabuf, d, strings); | |
ddf8abd2 MN |
2515 | } |
2516 | ||
2517 | /* For each language */ | |
2518 | data += 16; | |
2519 | len -= 16; | |
2520 | ||
2521 | do { /* lang_count > 0 so we can use do-while */ | |
2522 | unsigned needed = needed_count; | |
2523 | ||
2524 | if (unlikely(len < 3)) | |
2525 | goto error_free; | |
2526 | t->language = get_unaligned_le16(data); | |
2527 | t->strings = s; | |
2528 | ++t; | |
2529 | ||
2530 | data += 2; | |
2531 | len -= 2; | |
2532 | ||
2533 | /* For each string */ | |
2534 | do { /* str_count > 0 so we can use do-while */ | |
2535 | size_t length = strnlen(data, len); | |
2536 | ||
2537 | if (unlikely(length == len)) | |
2538 | goto error_free; | |
2539 | ||
5ab54cf7 MN |
2540 | /* |
2541 | * User may provide more strings then we need, | |
2542 | * if that's the case we simply ignore the | |
2543 | * rest | |
2544 | */ | |
ddf8abd2 | 2545 | if (likely(needed)) { |
5ab54cf7 MN |
2546 | /* |
2547 | * s->id will be set while adding | |
ddf8abd2 | 2548 | * function to configuration so for |
5ab54cf7 MN |
2549 | * now just leave garbage here. |
2550 | */ | |
ddf8abd2 MN |
2551 | s->s = data; |
2552 | --needed; | |
2553 | ++s; | |
2554 | } | |
2555 | ||
2556 | data += length + 1; | |
2557 | len -= length + 1; | |
2558 | } while (--str_count); | |
2559 | ||
2560 | s->id = 0; /* terminator */ | |
2561 | s->s = NULL; | |
2562 | ++s; | |
2563 | ||
2564 | } while (--lang_count); | |
2565 | ||
2566 | /* Some garbage left? */ | |
2567 | if (unlikely(len)) | |
2568 | goto error_free; | |
2569 | ||
2570 | /* Done! */ | |
2571 | ffs->stringtabs = stringtabs; | |
2572 | ffs->raw_strings = _data; | |
2573 | ||
2574 | return 0; | |
2575 | ||
2576 | error_free: | |
2577 | kfree(stringtabs); | |
2578 | error: | |
2579 | kfree(_data); | |
2580 | return -EINVAL; | |
2581 | } | |
2582 | ||
2583 | ||
ddf8abd2 MN |
2584 | /* Events handling and management *******************************************/ |
2585 | ||
2586 | static void __ffs_event_add(struct ffs_data *ffs, | |
2587 | enum usb_functionfs_event_type type) | |
2588 | { | |
2589 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; | |
2590 | int neg = 0; | |
2591 | ||
5ab54cf7 MN |
2592 | /* |
2593 | * Abort any unhandled setup | |
2594 | * | |
2595 | * We do not need to worry about some cmpxchg() changing value | |
ddf8abd2 MN |
2596 | * of ffs->setup_state without holding the lock because when |
2597 | * state is FFS_SETUP_PENDING cmpxchg() in several places in | |
5ab54cf7 MN |
2598 | * the source does nothing. |
2599 | */ | |
ddf8abd2 | 2600 | if (ffs->setup_state == FFS_SETUP_PENDING) |
e46318a0 | 2601 | ffs->setup_state = FFS_SETUP_CANCELLED; |
ddf8abd2 | 2602 | |
67913bbd MN |
2603 | /* |
2604 | * Logic of this function guarantees that there are at most four pending | |
2605 | * evens on ffs->ev.types queue. This is important because the queue | |
2606 | * has space for four elements only and __ffs_ep0_read_events function | |
2607 | * depends on that limit as well. If more event types are added, those | |
2608 | * limits have to be revisited or guaranteed to still hold. | |
2609 | */ | |
ddf8abd2 MN |
2610 | switch (type) { |
2611 | case FUNCTIONFS_RESUME: | |
2612 | rem_type2 = FUNCTIONFS_SUSPEND; | |
5ab54cf7 | 2613 | /* FALL THROUGH */ |
ddf8abd2 MN |
2614 | case FUNCTIONFS_SUSPEND: |
2615 | case FUNCTIONFS_SETUP: | |
2616 | rem_type1 = type; | |
5ab54cf7 | 2617 | /* Discard all similar events */ |
ddf8abd2 MN |
2618 | break; |
2619 | ||
2620 | case FUNCTIONFS_BIND: | |
2621 | case FUNCTIONFS_UNBIND: | |
2622 | case FUNCTIONFS_DISABLE: | |
2623 | case FUNCTIONFS_ENABLE: | |
5ab54cf7 | 2624 | /* Discard everything other then power management. */ |
ddf8abd2 MN |
2625 | rem_type1 = FUNCTIONFS_SUSPEND; |
2626 | rem_type2 = FUNCTIONFS_RESUME; | |
2627 | neg = 1; | |
2628 | break; | |
2629 | ||
2630 | default: | |
fe00bcbf MN |
2631 | WARN(1, "%d: unknown event, this should not happen\n", type); |
2632 | return; | |
ddf8abd2 MN |
2633 | } |
2634 | ||
2635 | { | |
2636 | u8 *ev = ffs->ev.types, *out = ev; | |
2637 | unsigned n = ffs->ev.count; | |
2638 | for (; n; --n, ++ev) | |
2639 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) | |
2640 | *out++ = *ev; | |
2641 | else | |
aa02f172 | 2642 | pr_vdebug("purging event %d\n", *ev); |
ddf8abd2 MN |
2643 | ffs->ev.count = out - ffs->ev.types; |
2644 | } | |
2645 | ||
aa02f172 | 2646 | pr_vdebug("adding event %d\n", type); |
ddf8abd2 MN |
2647 | ffs->ev.types[ffs->ev.count++] = type; |
2648 | wake_up_locked(&ffs->ev.waitq); | |
5e33f6fd RB |
2649 | if (ffs->ffs_eventfd) |
2650 | eventfd_signal(ffs->ffs_eventfd, 1); | |
ddf8abd2 MN |
2651 | } |
2652 | ||
2653 | static void ffs_event_add(struct ffs_data *ffs, | |
2654 | enum usb_functionfs_event_type type) | |
2655 | { | |
2656 | unsigned long flags; | |
2657 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2658 | __ffs_event_add(ffs, type); | |
2659 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2660 | } | |
2661 | ||
ddf8abd2 MN |
2662 | /* Bind/unbind USB function hooks *******************************************/ |
2663 | ||
6d5c1c77 RB |
2664 | static int ffs_ep_addr2idx(struct ffs_data *ffs, u8 endpoint_address) |
2665 | { | |
2666 | int i; | |
2667 | ||
2668 | for (i = 1; i < ARRAY_SIZE(ffs->eps_addrmap); ++i) | |
2669 | if (ffs->eps_addrmap[i] == endpoint_address) | |
2670 | return i; | |
2671 | return -ENOENT; | |
2672 | } | |
2673 | ||
ddf8abd2 MN |
2674 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, |
2675 | struct usb_descriptor_header *desc, | |
2676 | void *priv) | |
2677 | { | |
2678 | struct usb_endpoint_descriptor *ds = (void *)desc; | |
2679 | struct ffs_function *func = priv; | |
2680 | struct ffs_ep *ffs_ep; | |
85b06f5e DC |
2681 | unsigned ep_desc_id; |
2682 | int idx; | |
8d4e897b | 2683 | static const char *speed_names[] = { "full", "high", "super" }; |
ddf8abd2 MN |
2684 | |
2685 | if (type != FFS_DESCRIPTOR) | |
2686 | return 0; | |
2687 | ||
8d4e897b MG |
2688 | /* |
2689 | * If ss_descriptors is not NULL, we are reading super speed | |
2690 | * descriptors; if hs_descriptors is not NULL, we are reading high | |
2691 | * speed descriptors; otherwise, we are reading full speed | |
2692 | * descriptors. | |
2693 | */ | |
2694 | if (func->function.ss_descriptors) { | |
2695 | ep_desc_id = 2; | |
2696 | func->function.ss_descriptors[(long)valuep] = desc; | |
2697 | } else if (func->function.hs_descriptors) { | |
2698 | ep_desc_id = 1; | |
ddf8abd2 | 2699 | func->function.hs_descriptors[(long)valuep] = desc; |
8d4e897b MG |
2700 | } else { |
2701 | ep_desc_id = 0; | |
10287bae | 2702 | func->function.fs_descriptors[(long)valuep] = desc; |
8d4e897b | 2703 | } |
ddf8abd2 MN |
2704 | |
2705 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) | |
2706 | return 0; | |
2707 | ||
6d5c1c77 RB |
2708 | idx = ffs_ep_addr2idx(func->ffs, ds->bEndpointAddress) - 1; |
2709 | if (idx < 0) | |
2710 | return idx; | |
2711 | ||
ddf8abd2 MN |
2712 | ffs_ep = func->eps + idx; |
2713 | ||
8d4e897b MG |
2714 | if (unlikely(ffs_ep->descs[ep_desc_id])) { |
2715 | pr_err("two %sspeed descriptors for EP %d\n", | |
2716 | speed_names[ep_desc_id], | |
d8df0b61 | 2717 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
ddf8abd2 MN |
2718 | return -EINVAL; |
2719 | } | |
8d4e897b | 2720 | ffs_ep->descs[ep_desc_id] = ds; |
ddf8abd2 MN |
2721 | |
2722 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); | |
2723 | if (ffs_ep->ep) { | |
2724 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; | |
2725 | if (!ds->wMaxPacketSize) | |
2726 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; | |
2727 | } else { | |
2728 | struct usb_request *req; | |
2729 | struct usb_ep *ep; | |
1b0bf88f | 2730 | u8 bEndpointAddress; |
ddf8abd2 | 2731 | |
1b0bf88f RB |
2732 | /* |
2733 | * We back up bEndpointAddress because autoconfig overwrites | |
2734 | * it with physical endpoint address. | |
2735 | */ | |
2736 | bEndpointAddress = ds->bEndpointAddress; | |
aa02f172 | 2737 | pr_vdebug("autoconfig\n"); |
ddf8abd2 MN |
2738 | ep = usb_ep_autoconfig(func->gadget, ds); |
2739 | if (unlikely(!ep)) | |
2740 | return -ENOTSUPP; | |
cc7e6056 | 2741 | ep->driver_data = func->eps + idx; |
ddf8abd2 MN |
2742 | |
2743 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
2744 | if (unlikely(!req)) | |
2745 | return -ENOMEM; | |
2746 | ||
2747 | ffs_ep->ep = ep; | |
2748 | ffs_ep->req = req; | |
2749 | func->eps_revmap[ds->bEndpointAddress & | |
2750 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; | |
1b0bf88f RB |
2751 | /* |
2752 | * If we use virtual address mapping, we restore | |
2753 | * original bEndpointAddress value. | |
2754 | */ | |
2755 | if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) | |
2756 | ds->bEndpointAddress = bEndpointAddress; | |
ddf8abd2 MN |
2757 | } |
2758 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); | |
2759 | ||
2760 | return 0; | |
2761 | } | |
2762 | ||
ddf8abd2 MN |
2763 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, |
2764 | struct usb_descriptor_header *desc, | |
2765 | void *priv) | |
2766 | { | |
2767 | struct ffs_function *func = priv; | |
2768 | unsigned idx; | |
2769 | u8 newValue; | |
2770 | ||
2771 | switch (type) { | |
2772 | default: | |
2773 | case FFS_DESCRIPTOR: | |
2774 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ | |
2775 | return 0; | |
2776 | ||
2777 | case FFS_INTERFACE: | |
2778 | idx = *valuep; | |
2779 | if (func->interfaces_nums[idx] < 0) { | |
2780 | int id = usb_interface_id(func->conf, &func->function); | |
2781 | if (unlikely(id < 0)) | |
2782 | return id; | |
2783 | func->interfaces_nums[idx] = id; | |
2784 | } | |
2785 | newValue = func->interfaces_nums[idx]; | |
2786 | break; | |
2787 | ||
2788 | case FFS_STRING: | |
2789 | /* String' IDs are allocated when fsf_data is bound to cdev */ | |
2790 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; | |
2791 | break; | |
2792 | ||
2793 | case FFS_ENDPOINT: | |
5ab54cf7 MN |
2794 | /* |
2795 | * USB_DT_ENDPOINT are handled in | |
2796 | * __ffs_func_bind_do_descs(). | |
2797 | */ | |
ddf8abd2 MN |
2798 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
2799 | return 0; | |
2800 | ||
2801 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2802 | if (unlikely(!func->eps[idx].ep)) | |
2803 | return -EINVAL; | |
2804 | ||
2805 | { | |
2806 | struct usb_endpoint_descriptor **descs; | |
2807 | descs = func->eps[idx].descs; | |
2808 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; | |
2809 | } | |
2810 | break; | |
2811 | } | |
2812 | ||
aa02f172 | 2813 | pr_vdebug("%02x -> %02x\n", *valuep, newValue); |
ddf8abd2 MN |
2814 | *valuep = newValue; |
2815 | return 0; | |
2816 | } | |
2817 | ||
f0175ab5 AP |
2818 | static int __ffs_func_bind_do_os_desc(enum ffs_os_desc_type type, |
2819 | struct usb_os_desc_header *h, void *data, | |
2820 | unsigned len, void *priv) | |
2821 | { | |
2822 | struct ffs_function *func = priv; | |
2823 | u8 length = 0; | |
2824 | ||
2825 | switch (type) { | |
2826 | case FFS_OS_DESC_EXT_COMPAT: { | |
2827 | struct usb_ext_compat_desc *desc = data; | |
2828 | struct usb_os_desc_table *t; | |
2829 | ||
2830 | t = &func->function.os_desc_table[desc->bFirstInterfaceNumber]; | |
2831 | t->if_id = func->interfaces_nums[desc->bFirstInterfaceNumber]; | |
2832 | memcpy(t->os_desc->ext_compat_id, &desc->CompatibleID, | |
2833 | ARRAY_SIZE(desc->CompatibleID) + | |
2834 | ARRAY_SIZE(desc->SubCompatibleID)); | |
2835 | length = sizeof(*desc); | |
2836 | } | |
2837 | break; | |
2838 | case FFS_OS_DESC_EXT_PROP: { | |
2839 | struct usb_ext_prop_desc *desc = data; | |
2840 | struct usb_os_desc_table *t; | |
2841 | struct usb_os_desc_ext_prop *ext_prop; | |
2842 | char *ext_prop_name; | |
2843 | char *ext_prop_data; | |
2844 | ||
2845 | t = &func->function.os_desc_table[h->interface]; | |
2846 | t->if_id = func->interfaces_nums[h->interface]; | |
2847 | ||
2848 | ext_prop = func->ffs->ms_os_descs_ext_prop_avail; | |
2849 | func->ffs->ms_os_descs_ext_prop_avail += sizeof(*ext_prop); | |
2850 | ||
2851 | ext_prop->type = le32_to_cpu(desc->dwPropertyDataType); | |
2852 | ext_prop->name_len = le16_to_cpu(desc->wPropertyNameLength); | |
2853 | ext_prop->data_len = le32_to_cpu(*(u32 *) | |
2854 | usb_ext_prop_data_len_ptr(data, ext_prop->name_len)); | |
2855 | length = ext_prop->name_len + ext_prop->data_len + 14; | |
2856 | ||
2857 | ext_prop_name = func->ffs->ms_os_descs_ext_prop_name_avail; | |
2858 | func->ffs->ms_os_descs_ext_prop_name_avail += | |
2859 | ext_prop->name_len; | |
2860 | ||
2861 | ext_prop_data = func->ffs->ms_os_descs_ext_prop_data_avail; | |
2862 | func->ffs->ms_os_descs_ext_prop_data_avail += | |
2863 | ext_prop->data_len; | |
2864 | memcpy(ext_prop_data, | |
2865 | usb_ext_prop_data_ptr(data, ext_prop->name_len), | |
2866 | ext_prop->data_len); | |
2867 | /* unicode data reported to the host as "WCHAR"s */ | |
2868 | switch (ext_prop->type) { | |
2869 | case USB_EXT_PROP_UNICODE: | |
2870 | case USB_EXT_PROP_UNICODE_ENV: | |
2871 | case USB_EXT_PROP_UNICODE_LINK: | |
2872 | case USB_EXT_PROP_UNICODE_MULTI: | |
2873 | ext_prop->data_len *= 2; | |
2874 | break; | |
2875 | } | |
2876 | ext_prop->data = ext_prop_data; | |
2877 | ||
2878 | memcpy(ext_prop_name, usb_ext_prop_name_ptr(data), | |
2879 | ext_prop->name_len); | |
2880 | /* property name reported to the host as "WCHAR"s */ | |
2881 | ext_prop->name_len *= 2; | |
2882 | ext_prop->name = ext_prop_name; | |
2883 | ||
2884 | t->os_desc->ext_prop_len += | |
2885 | ext_prop->name_len + ext_prop->data_len + 14; | |
2886 | ++t->os_desc->ext_prop_count; | |
2887 | list_add_tail(&ext_prop->entry, &t->os_desc->ext_prop); | |
2888 | } | |
2889 | break; | |
2890 | default: | |
2891 | pr_vdebug("unknown descriptor: %d\n", type); | |
2892 | } | |
2893 | ||
2894 | return length; | |
2895 | } | |
2896 | ||
5920cda6 AP |
2897 | static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, |
2898 | struct usb_configuration *c) | |
2899 | { | |
2900 | struct ffs_function *func = ffs_func_from_usb(f); | |
2901 | struct f_fs_opts *ffs_opts = | |
2902 | container_of(f->fi, struct f_fs_opts, func_inst); | |
2903 | int ret; | |
2904 | ||
2905 | ENTER(); | |
2906 | ||
2907 | /* | |
2908 | * Legacy gadget triggers binding in functionfs_ready_callback, | |
2909 | * which already uses locking; taking the same lock here would | |
2910 | * cause a deadlock. | |
2911 | * | |
2912 | * Configfs-enabled gadgets however do need ffs_dev_lock. | |
2913 | */ | |
2914 | if (!ffs_opts->no_configfs) | |
2915 | ffs_dev_lock(); | |
2916 | ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; | |
2917 | func->ffs = ffs_opts->dev->ffs_data; | |
2918 | if (!ffs_opts->no_configfs) | |
2919 | ffs_dev_unlock(); | |
2920 | if (ret) | |
2921 | return ERR_PTR(ret); | |
2922 | ||
2923 | func->conf = c; | |
2924 | func->gadget = c->cdev->gadget; | |
2925 | ||
5920cda6 AP |
2926 | /* |
2927 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
2928 | * configurations are bound in sequence with list_for_each_entry, | |
2929 | * in each configuration its functions are bound in sequence | |
2930 | * with list_for_each_entry, so we assume no race condition | |
2931 | * with regard to ffs_opts->bound access | |
2932 | */ | |
2933 | if (!ffs_opts->refcnt) { | |
2934 | ret = functionfs_bind(func->ffs, c->cdev); | |
2935 | if (ret) | |
2936 | return ERR_PTR(ret); | |
2937 | } | |
2938 | ffs_opts->refcnt++; | |
2939 | func->function.strings = func->ffs->stringtabs; | |
2940 | ||
2941 | return ffs_opts; | |
2942 | } | |
5920cda6 AP |
2943 | |
2944 | static int _ffs_func_bind(struct usb_configuration *c, | |
2945 | struct usb_function *f) | |
ddf8abd2 MN |
2946 | { |
2947 | struct ffs_function *func = ffs_func_from_usb(f); | |
2948 | struct ffs_data *ffs = func->ffs; | |
2949 | ||
2950 | const int full = !!func->ffs->fs_descs_count; | |
2951 | const int high = gadget_is_dualspeed(func->gadget) && | |
2952 | func->ffs->hs_descs_count; | |
8d4e897b MG |
2953 | const int super = gadget_is_superspeed(func->gadget) && |
2954 | func->ffs->ss_descs_count; | |
ddf8abd2 | 2955 | |
f0175ab5 | 2956 | int fs_len, hs_len, ss_len, ret, i; |
0015f915 | 2957 | struct ffs_ep *eps_ptr; |
ddf8abd2 MN |
2958 | |
2959 | /* Make it a single chunk, less management later on */ | |
e6f3862f AP |
2960 | vla_group(d); |
2961 | vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); | |
2962 | vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, | |
2963 | full ? ffs->fs_descs_count + 1 : 0); | |
2964 | vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, | |
2965 | high ? ffs->hs_descs_count + 1 : 0); | |
8d4e897b MG |
2966 | vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, |
2967 | super ? ffs->ss_descs_count + 1 : 0); | |
e6f3862f | 2968 | vla_item_with_sz(d, short, inums, ffs->interfaces_count); |
f0175ab5 AP |
2969 | vla_item_with_sz(d, struct usb_os_desc_table, os_desc_table, |
2970 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2971 | vla_item_with_sz(d, char[16], ext_compat, | |
2972 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2973 | vla_item_with_sz(d, struct usb_os_desc, os_desc, | |
2974 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2975 | vla_item_with_sz(d, struct usb_os_desc_ext_prop, ext_prop, | |
2976 | ffs->ms_os_descs_ext_prop_count); | |
2977 | vla_item_with_sz(d, char, ext_prop_name, | |
2978 | ffs->ms_os_descs_ext_prop_name_len); | |
2979 | vla_item_with_sz(d, char, ext_prop_data, | |
2980 | ffs->ms_os_descs_ext_prop_data_len); | |
ac8dde11 | 2981 | vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); |
e6f3862f | 2982 | char *vlabuf; |
ddf8abd2 MN |
2983 | |
2984 | ENTER(); | |
2985 | ||
8d4e897b MG |
2986 | /* Has descriptors only for speeds gadget does not support */ |
2987 | if (unlikely(!(full | high | super))) | |
ddf8abd2 MN |
2988 | return -ENOTSUPP; |
2989 | ||
e6f3862f | 2990 | /* Allocate a single chunk, less management later on */ |
f0175ab5 | 2991 | vlabuf = kzalloc(vla_group_size(d), GFP_KERNEL); |
e6f3862f | 2992 | if (unlikely(!vlabuf)) |
ddf8abd2 MN |
2993 | return -ENOMEM; |
2994 | ||
f0175ab5 AP |
2995 | ffs->ms_os_descs_ext_prop_avail = vla_ptr(vlabuf, d, ext_prop); |
2996 | ffs->ms_os_descs_ext_prop_name_avail = | |
2997 | vla_ptr(vlabuf, d, ext_prop_name); | |
2998 | ffs->ms_os_descs_ext_prop_data_avail = | |
2999 | vla_ptr(vlabuf, d, ext_prop_data); | |
3000 | ||
ac8dde11 MN |
3001 | /* Copy descriptors */ |
3002 | memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, | |
3003 | ffs->raw_descs_length); | |
8d4e897b | 3004 | |
e6f3862f | 3005 | memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); |
0015f915 DC |
3006 | eps_ptr = vla_ptr(vlabuf, d, eps); |
3007 | for (i = 0; i < ffs->eps_count; i++) | |
3008 | eps_ptr[i].num = -1; | |
ddf8abd2 | 3009 | |
e6f3862f AP |
3010 | /* Save pointers |
3011 | * d_eps == vlabuf, func->eps used to kfree vlabuf later | |
3012 | */ | |
3013 | func->eps = vla_ptr(vlabuf, d, eps); | |
3014 | func->interfaces_nums = vla_ptr(vlabuf, d, inums); | |
ddf8abd2 | 3015 | |
5ab54cf7 MN |
3016 | /* |
3017 | * Go through all the endpoint descriptors and allocate | |
ddf8abd2 | 3018 | * endpoints first, so that later we can rewrite the endpoint |
5ab54cf7 MN |
3019 | * numbers without worrying that it may be described later on. |
3020 | */ | |
ddf8abd2 | 3021 | if (likely(full)) { |
e6f3862f | 3022 | func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); |
8d4e897b MG |
3023 | fs_len = ffs_do_descs(ffs->fs_descs_count, |
3024 | vla_ptr(vlabuf, d, raw_descs), | |
3025 | d_raw_descs__sz, | |
3026 | __ffs_func_bind_do_descs, func); | |
3027 | if (unlikely(fs_len < 0)) { | |
3028 | ret = fs_len; | |
ddf8abd2 | 3029 | goto error; |
8d4e897b | 3030 | } |
ddf8abd2 | 3031 | } else { |
8d4e897b | 3032 | fs_len = 0; |
ddf8abd2 MN |
3033 | } |
3034 | ||
3035 | if (likely(high)) { | |
e6f3862f | 3036 | func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); |
8d4e897b MG |
3037 | hs_len = ffs_do_descs(ffs->hs_descs_count, |
3038 | vla_ptr(vlabuf, d, raw_descs) + fs_len, | |
3039 | d_raw_descs__sz - fs_len, | |
3040 | __ffs_func_bind_do_descs, func); | |
3041 | if (unlikely(hs_len < 0)) { | |
3042 | ret = hs_len; | |
3043 | goto error; | |
3044 | } | |
3045 | } else { | |
3046 | hs_len = 0; | |
3047 | } | |
3048 | ||
3049 | if (likely(super)) { | |
3050 | func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); | |
f0175ab5 | 3051 | ss_len = ffs_do_descs(ffs->ss_descs_count, |
8d4e897b MG |
3052 | vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, |
3053 | d_raw_descs__sz - fs_len - hs_len, | |
3054 | __ffs_func_bind_do_descs, func); | |
f0175ab5 AP |
3055 | if (unlikely(ss_len < 0)) { |
3056 | ret = ss_len; | |
8854894c | 3057 | goto error; |
f0175ab5 AP |
3058 | } |
3059 | } else { | |
3060 | ss_len = 0; | |
ddf8abd2 MN |
3061 | } |
3062 | ||
5ab54cf7 MN |
3063 | /* |
3064 | * Now handle interface numbers allocation and interface and | |
3065 | * endpoint numbers rewriting. We can do that in one go | |
3066 | * now. | |
3067 | */ | |
ddf8abd2 | 3068 | ret = ffs_do_descs(ffs->fs_descs_count + |
8d4e897b MG |
3069 | (high ? ffs->hs_descs_count : 0) + |
3070 | (super ? ffs->ss_descs_count : 0), | |
e6f3862f | 3071 | vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, |
ddf8abd2 MN |
3072 | __ffs_func_bind_do_nums, func); |
3073 | if (unlikely(ret < 0)) | |
3074 | goto error; | |
3075 | ||
f0175ab5 | 3076 | func->function.os_desc_table = vla_ptr(vlabuf, d, os_desc_table); |
c6010c8b | 3077 | if (c->cdev->use_os_string) { |
f0175ab5 AP |
3078 | for (i = 0; i < ffs->interfaces_count; ++i) { |
3079 | struct usb_os_desc *desc; | |
3080 | ||
3081 | desc = func->function.os_desc_table[i].os_desc = | |
3082 | vla_ptr(vlabuf, d, os_desc) + | |
3083 | i * sizeof(struct usb_os_desc); | |
3084 | desc->ext_compat_id = | |
3085 | vla_ptr(vlabuf, d, ext_compat) + i * 16; | |
3086 | INIT_LIST_HEAD(&desc->ext_prop); | |
3087 | } | |
c6010c8b JL |
3088 | ret = ffs_do_os_descs(ffs->ms_os_descs_count, |
3089 | vla_ptr(vlabuf, d, raw_descs) + | |
3090 | fs_len + hs_len + ss_len, | |
3091 | d_raw_descs__sz - fs_len - hs_len - | |
3092 | ss_len, | |
3093 | __ffs_func_bind_do_os_desc, func); | |
3094 | if (unlikely(ret < 0)) | |
3095 | goto error; | |
3096 | } | |
f0175ab5 AP |
3097 | func->function.os_desc_n = |
3098 | c->cdev->use_os_string ? ffs->interfaces_count : 0; | |
3099 | ||
ddf8abd2 MN |
3100 | /* And we're done */ |
3101 | ffs_event_add(ffs, FUNCTIONFS_BIND); | |
3102 | return 0; | |
3103 | ||
3104 | error: | |
3105 | /* XXX Do we need to release all claimed endpoints here? */ | |
3106 | return ret; | |
3107 | } | |
3108 | ||
5920cda6 AP |
3109 | static int ffs_func_bind(struct usb_configuration *c, |
3110 | struct usb_function *f) | |
3111 | { | |
5920cda6 | 3112 | struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); |
55d81121 RB |
3113 | struct ffs_function *func = ffs_func_from_usb(f); |
3114 | int ret; | |
5920cda6 AP |
3115 | |
3116 | if (IS_ERR(ffs_opts)) | |
3117 | return PTR_ERR(ffs_opts); | |
5920cda6 | 3118 | |
55d81121 RB |
3119 | ret = _ffs_func_bind(c, f); |
3120 | if (ret && !--ffs_opts->refcnt) | |
3121 | functionfs_unbind(func->ffs); | |
3122 | ||
3123 | return ret; | |
5920cda6 AP |
3124 | } |
3125 | ||
ddf8abd2 MN |
3126 | |
3127 | /* Other USB function hooks *************************************************/ | |
3128 | ||
18d6b32f RB |
3129 | static void ffs_reset_work(struct work_struct *work) |
3130 | { | |
3131 | struct ffs_data *ffs = container_of(work, | |
3132 | struct ffs_data, reset_work); | |
3133 | ffs_data_reset(ffs); | |
3134 | } | |
3135 | ||
ddf8abd2 MN |
3136 | static int ffs_func_set_alt(struct usb_function *f, |
3137 | unsigned interface, unsigned alt) | |
3138 | { | |
3139 | struct ffs_function *func = ffs_func_from_usb(f); | |
3140 | struct ffs_data *ffs = func->ffs; | |
3141 | int ret = 0, intf; | |
3142 | ||
3143 | if (alt != (unsigned)-1) { | |
3144 | intf = ffs_func_revmap_intf(func, interface); | |
3145 | if (unlikely(intf < 0)) | |
3146 | return intf; | |
3147 | } | |
3148 | ||
3149 | if (ffs->func) | |
3150 | ffs_func_eps_disable(ffs->func); | |
3151 | ||
18d6b32f RB |
3152 | if (ffs->state == FFS_DEACTIVATED) { |
3153 | ffs->state = FFS_CLOSING; | |
3154 | INIT_WORK(&ffs->reset_work, ffs_reset_work); | |
3155 | schedule_work(&ffs->reset_work); | |
3156 | return -ENODEV; | |
3157 | } | |
3158 | ||
ddf8abd2 MN |
3159 | if (ffs->state != FFS_ACTIVE) |
3160 | return -ENODEV; | |
3161 | ||
3162 | if (alt == (unsigned)-1) { | |
3163 | ffs->func = NULL; | |
3164 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); | |
3165 | return 0; | |
3166 | } | |
3167 | ||
3168 | ffs->func = func; | |
3169 | ret = ffs_func_eps_enable(func); | |
3170 | if (likely(ret >= 0)) | |
3171 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); | |
3172 | return ret; | |
3173 | } | |
3174 | ||
3175 | static void ffs_func_disable(struct usb_function *f) | |
3176 | { | |
3177 | ffs_func_set_alt(f, 0, (unsigned)-1); | |
3178 | } | |
3179 | ||
3180 | static int ffs_func_setup(struct usb_function *f, | |
3181 | const struct usb_ctrlrequest *creq) | |
3182 | { | |
3183 | struct ffs_function *func = ffs_func_from_usb(f); | |
3184 | struct ffs_data *ffs = func->ffs; | |
3185 | unsigned long flags; | |
3186 | int ret; | |
3187 | ||
3188 | ENTER(); | |
3189 | ||
aa02f172 MN |
3190 | pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); |
3191 | pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); | |
3192 | pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); | |
3193 | pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); | |
3194 | pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); | |
ddf8abd2 | 3195 | |
5ab54cf7 MN |
3196 | /* |
3197 | * Most requests directed to interface go through here | |
ddf8abd2 MN |
3198 | * (notable exceptions are set/get interface) so we need to |
3199 | * handle them. All other either handled by composite or | |
3200 | * passed to usb_configuration->setup() (if one is set). No | |
3201 | * matter, we will handle requests directed to endpoint here | |
54dfce6d FH |
3202 | * as well (as it's straightforward). Other request recipient |
3203 | * types are only handled when the user flag FUNCTIONFS_ALL_CTRL_RECIP | |
3204 | * is being used. | |
5ab54cf7 | 3205 | */ |
ddf8abd2 MN |
3206 | if (ffs->state != FFS_ACTIVE) |
3207 | return -ENODEV; | |
3208 | ||
3209 | switch (creq->bRequestType & USB_RECIP_MASK) { | |
3210 | case USB_RECIP_INTERFACE: | |
3211 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); | |
3212 | if (unlikely(ret < 0)) | |
3213 | return ret; | |
3214 | break; | |
3215 | ||
3216 | case USB_RECIP_ENDPOINT: | |
3217 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); | |
3218 | if (unlikely(ret < 0)) | |
3219 | return ret; | |
1b0bf88f RB |
3220 | if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) |
3221 | ret = func->ffs->eps_addrmap[ret]; | |
ddf8abd2 MN |
3222 | break; |
3223 | ||
3224 | default: | |
54dfce6d FH |
3225 | if (func->ffs->user_flags & FUNCTIONFS_ALL_CTRL_RECIP) |
3226 | ret = le16_to_cpu(creq->wIndex); | |
3227 | else | |
3228 | return -EOPNOTSUPP; | |
ddf8abd2 MN |
3229 | } |
3230 | ||
3231 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
3232 | ffs->ev.setup = *creq; | |
3233 | ffs->ev.setup.wIndex = cpu_to_le16(ret); | |
3234 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); | |
3235 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
3236 | ||
3237 | return 0; | |
3238 | } | |
3239 | ||
54dfce6d | 3240 | static bool ffs_func_req_match(struct usb_function *f, |
1a00b457 FH |
3241 | const struct usb_ctrlrequest *creq, |
3242 | bool config0) | |
54dfce6d FH |
3243 | { |
3244 | struct ffs_function *func = ffs_func_from_usb(f); | |
3245 | ||
4368c28a | 3246 | if (config0 && !(func->ffs->user_flags & FUNCTIONFS_CONFIG0_SETUP)) |
1a00b457 FH |
3247 | return false; |
3248 | ||
54dfce6d FH |
3249 | switch (creq->bRequestType & USB_RECIP_MASK) { |
3250 | case USB_RECIP_INTERFACE: | |
05e78c69 FH |
3251 | return (ffs_func_revmap_intf(func, |
3252 | le16_to_cpu(creq->wIndex)) >= 0); | |
54dfce6d | 3253 | case USB_RECIP_ENDPOINT: |
05e78c69 FH |
3254 | return (ffs_func_revmap_ep(func, |
3255 | le16_to_cpu(creq->wIndex)) >= 0); | |
54dfce6d FH |
3256 | default: |
3257 | return (bool) (func->ffs->user_flags & | |
3258 | FUNCTIONFS_ALL_CTRL_RECIP); | |
3259 | } | |
3260 | } | |
3261 | ||
ddf8abd2 MN |
3262 | static void ffs_func_suspend(struct usb_function *f) |
3263 | { | |
3264 | ENTER(); | |
3265 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); | |
3266 | } | |
3267 | ||
3268 | static void ffs_func_resume(struct usb_function *f) | |
3269 | { | |
3270 | ENTER(); | |
3271 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); | |
3272 | } | |
3273 | ||
3274 | ||
5ab54cf7 | 3275 | /* Endpoint and interface numbers reverse mapping ***************************/ |
ddf8abd2 MN |
3276 | |
3277 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) | |
3278 | { | |
3279 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; | |
3280 | return num ? num : -EDOM; | |
3281 | } | |
3282 | ||
3283 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) | |
3284 | { | |
3285 | short *nums = func->interfaces_nums; | |
3286 | unsigned count = func->ffs->interfaces_count; | |
3287 | ||
3288 | for (; count; --count, ++nums) { | |
3289 | if (*nums >= 0 && *nums == intf) | |
3290 | return nums - func->interfaces_nums; | |
3291 | } | |
3292 | ||
3293 | return -EDOM; | |
3294 | } | |
3295 | ||
3296 | ||
4b187fce AP |
3297 | /* Devices management *******************************************************/ |
3298 | ||
3299 | static LIST_HEAD(ffs_devices); | |
3300 | ||
da13a773 | 3301 | static struct ffs_dev *_ffs_do_find_dev(const char *name) |
4b187fce AP |
3302 | { |
3303 | struct ffs_dev *dev; | |
3304 | ||
3305 | list_for_each_entry(dev, &ffs_devices, entry) { | |
3306 | if (!dev->name || !name) | |
3307 | continue; | |
3308 | if (strcmp(dev->name, name) == 0) | |
3309 | return dev; | |
3310 | } | |
b658499f | 3311 | |
4b187fce AP |
3312 | return NULL; |
3313 | } | |
3314 | ||
3315 | /* | |
3316 | * ffs_lock must be taken by the caller of this function | |
3317 | */ | |
da13a773 | 3318 | static struct ffs_dev *_ffs_get_single_dev(void) |
4b187fce AP |
3319 | { |
3320 | struct ffs_dev *dev; | |
3321 | ||
3322 | if (list_is_singular(&ffs_devices)) { | |
3323 | dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); | |
3324 | if (dev->single) | |
3325 | return dev; | |
3326 | } | |
3327 | ||
3328 | return NULL; | |
3329 | } | |
3330 | ||
3331 | /* | |
3332 | * ffs_lock must be taken by the caller of this function | |
3333 | */ | |
da13a773 | 3334 | static struct ffs_dev *_ffs_find_dev(const char *name) |
4b187fce AP |
3335 | { |
3336 | struct ffs_dev *dev; | |
3337 | ||
da13a773 | 3338 | dev = _ffs_get_single_dev(); |
4b187fce AP |
3339 | if (dev) |
3340 | return dev; | |
3341 | ||
da13a773 | 3342 | return _ffs_do_find_dev(name); |
4b187fce AP |
3343 | } |
3344 | ||
b658499f AP |
3345 | /* Configfs support *********************************************************/ |
3346 | ||
3347 | static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) | |
3348 | { | |
3349 | return container_of(to_config_group(item), struct f_fs_opts, | |
3350 | func_inst.group); | |
3351 | } | |
3352 | ||
3353 | static void ffs_attr_release(struct config_item *item) | |
3354 | { | |
3355 | struct f_fs_opts *opts = to_ffs_opts(item); | |
3356 | ||
3357 | usb_put_function_instance(&opts->func_inst); | |
3358 | } | |
3359 | ||
3360 | static struct configfs_item_operations ffs_item_ops = { | |
3361 | .release = ffs_attr_release, | |
3362 | }; | |
3363 | ||
3364 | static struct config_item_type ffs_func_type = { | |
3365 | .ct_item_ops = &ffs_item_ops, | |
3366 | .ct_owner = THIS_MODULE, | |
3367 | }; | |
3368 | ||
3369 | ||
5920cda6 AP |
3370 | /* Function registration interface ******************************************/ |
3371 | ||
5920cda6 AP |
3372 | static void ffs_free_inst(struct usb_function_instance *f) |
3373 | { | |
3374 | struct f_fs_opts *opts; | |
3375 | ||
3376 | opts = to_f_fs_opts(f); | |
3377 | ffs_dev_lock(); | |
da13a773 | 3378 | _ffs_free_dev(opts->dev); |
5920cda6 AP |
3379 | ffs_dev_unlock(); |
3380 | kfree(opts); | |
3381 | } | |
3382 | ||
b658499f AP |
3383 | #define MAX_INST_NAME_LEN 40 |
3384 | ||
3385 | static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) | |
3386 | { | |
3387 | struct f_fs_opts *opts; | |
3388 | char *ptr; | |
3389 | const char *tmp; | |
3390 | int name_len, ret; | |
3391 | ||
3392 | name_len = strlen(name) + 1; | |
3393 | if (name_len > MAX_INST_NAME_LEN) | |
3394 | return -ENAMETOOLONG; | |
3395 | ||
3396 | ptr = kstrndup(name, name_len, GFP_KERNEL); | |
3397 | if (!ptr) | |
3398 | return -ENOMEM; | |
3399 | ||
3400 | opts = to_f_fs_opts(fi); | |
3401 | tmp = NULL; | |
3402 | ||
3403 | ffs_dev_lock(); | |
3404 | ||
3405 | tmp = opts->dev->name_allocated ? opts->dev->name : NULL; | |
3406 | ret = _ffs_name_dev(opts->dev, ptr); | |
3407 | if (ret) { | |
3408 | kfree(ptr); | |
3409 | ffs_dev_unlock(); | |
3410 | return ret; | |
3411 | } | |
3412 | opts->dev->name_allocated = true; | |
3413 | ||
3414 | ffs_dev_unlock(); | |
3415 | ||
3416 | kfree(tmp); | |
3417 | ||
3418 | return 0; | |
3419 | } | |
3420 | ||
5920cda6 AP |
3421 | static struct usb_function_instance *ffs_alloc_inst(void) |
3422 | { | |
3423 | struct f_fs_opts *opts; | |
3424 | struct ffs_dev *dev; | |
3425 | ||
3426 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3427 | if (!opts) | |
3428 | return ERR_PTR(-ENOMEM); | |
3429 | ||
b658499f | 3430 | opts->func_inst.set_inst_name = ffs_set_inst_name; |
5920cda6 AP |
3431 | opts->func_inst.free_func_inst = ffs_free_inst; |
3432 | ffs_dev_lock(); | |
da13a773 | 3433 | dev = _ffs_alloc_dev(); |
5920cda6 AP |
3434 | ffs_dev_unlock(); |
3435 | if (IS_ERR(dev)) { | |
3436 | kfree(opts); | |
3437 | return ERR_CAST(dev); | |
3438 | } | |
3439 | opts->dev = dev; | |
b658499f | 3440 | dev->opts = opts; |
5920cda6 | 3441 | |
b658499f AP |
3442 | config_group_init_type_name(&opts->func_inst.group, "", |
3443 | &ffs_func_type); | |
5920cda6 AP |
3444 | return &opts->func_inst; |
3445 | } | |
3446 | ||
3447 | static void ffs_free(struct usb_function *f) | |
3448 | { | |
3449 | kfree(ffs_func_from_usb(f)); | |
3450 | } | |
3451 | ||
3452 | static void ffs_func_unbind(struct usb_configuration *c, | |
3453 | struct usb_function *f) | |
3454 | { | |
3455 | struct ffs_function *func = ffs_func_from_usb(f); | |
3456 | struct ffs_data *ffs = func->ffs; | |
3457 | struct f_fs_opts *opts = | |
3458 | container_of(f->fi, struct f_fs_opts, func_inst); | |
3459 | struct ffs_ep *ep = func->eps; | |
3460 | unsigned count = ffs->eps_count; | |
3461 | unsigned long flags; | |
3462 | ||
3463 | ENTER(); | |
3464 | if (ffs->func == func) { | |
3465 | ffs_func_eps_disable(func); | |
3466 | ffs->func = NULL; | |
3467 | } | |
3468 | ||
3469 | if (!--opts->refcnt) | |
3470 | functionfs_unbind(ffs); | |
3471 | ||
3472 | /* cleanup after autoconfig */ | |
3473 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
08f37148 | 3474 | while (count--) { |
5920cda6 AP |
3475 | if (ep->ep && ep->req) |
3476 | usb_ep_free_request(ep->ep, ep->req); | |
3477 | ep->req = NULL; | |
3478 | ++ep; | |
08f37148 | 3479 | } |
5920cda6 AP |
3480 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); |
3481 | kfree(func->eps); | |
3482 | func->eps = NULL; | |
3483 | /* | |
3484 | * eps, descriptors and interfaces_nums are allocated in the | |
3485 | * same chunk so only one free is required. | |
3486 | */ | |
3487 | func->function.fs_descriptors = NULL; | |
3488 | func->function.hs_descriptors = NULL; | |
8d4e897b | 3489 | func->function.ss_descriptors = NULL; |
5920cda6 AP |
3490 | func->interfaces_nums = NULL; |
3491 | ||
3492 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); | |
3493 | } | |
3494 | ||
3495 | static struct usb_function *ffs_alloc(struct usb_function_instance *fi) | |
3496 | { | |
3497 | struct ffs_function *func; | |
3498 | ||
3499 | ENTER(); | |
3500 | ||
3501 | func = kzalloc(sizeof(*func), GFP_KERNEL); | |
3502 | if (unlikely(!func)) | |
3503 | return ERR_PTR(-ENOMEM); | |
3504 | ||
3505 | func->function.name = "Function FS Gadget"; | |
3506 | ||
3507 | func->function.bind = ffs_func_bind; | |
3508 | func->function.unbind = ffs_func_unbind; | |
3509 | func->function.set_alt = ffs_func_set_alt; | |
3510 | func->function.disable = ffs_func_disable; | |
3511 | func->function.setup = ffs_func_setup; | |
54dfce6d | 3512 | func->function.req_match = ffs_func_req_match; |
5920cda6 AP |
3513 | func->function.suspend = ffs_func_suspend; |
3514 | func->function.resume = ffs_func_resume; | |
3515 | func->function.free_func = ffs_free; | |
3516 | ||
3517 | return &func->function; | |
3518 | } | |
3519 | ||
4b187fce AP |
3520 | /* |
3521 | * ffs_lock must be taken by the caller of this function | |
3522 | */ | |
da13a773 | 3523 | static struct ffs_dev *_ffs_alloc_dev(void) |
4b187fce AP |
3524 | { |
3525 | struct ffs_dev *dev; | |
3526 | int ret; | |
3527 | ||
da13a773 | 3528 | if (_ffs_get_single_dev()) |
4b187fce AP |
3529 | return ERR_PTR(-EBUSY); |
3530 | ||
3531 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
3532 | if (!dev) | |
3533 | return ERR_PTR(-ENOMEM); | |
3534 | ||
3535 | if (list_empty(&ffs_devices)) { | |
3536 | ret = functionfs_init(); | |
3537 | if (ret) { | |
3538 | kfree(dev); | |
3539 | return ERR_PTR(ret); | |
3540 | } | |
3541 | } | |
3542 | ||
3543 | list_add(&dev->entry, &ffs_devices); | |
3544 | ||
3545 | return dev; | |
3546 | } | |
3547 | ||
3548 | /* | |
3549 | * ffs_lock must be taken by the caller of this function | |
3550 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3551 | */ | |
3552 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3553 | { | |
3554 | struct ffs_dev *existing; | |
3555 | ||
da13a773 | 3556 | existing = _ffs_do_find_dev(name); |
4b187fce AP |
3557 | if (existing) |
3558 | return -EBUSY; | |
ab13cb0c | 3559 | |
4b187fce AP |
3560 | dev->name = name; |
3561 | ||
3562 | return 0; | |
3563 | } | |
3564 | ||
3565 | /* | |
3566 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3567 | */ | |
3568 | int ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3569 | { | |
3570 | int ret; | |
3571 | ||
3572 | ffs_dev_lock(); | |
3573 | ret = _ffs_name_dev(dev, name); | |
3574 | ffs_dev_unlock(); | |
3575 | ||
3576 | return ret; | |
3577 | } | |
0700faaf | 3578 | EXPORT_SYMBOL_GPL(ffs_name_dev); |
4b187fce AP |
3579 | |
3580 | int ffs_single_dev(struct ffs_dev *dev) | |
3581 | { | |
3582 | int ret; | |
3583 | ||
3584 | ret = 0; | |
3585 | ffs_dev_lock(); | |
3586 | ||
3587 | if (!list_is_singular(&ffs_devices)) | |
3588 | ret = -EBUSY; | |
3589 | else | |
3590 | dev->single = true; | |
3591 | ||
3592 | ffs_dev_unlock(); | |
3593 | return ret; | |
3594 | } | |
0700faaf | 3595 | EXPORT_SYMBOL_GPL(ffs_single_dev); |
4b187fce AP |
3596 | |
3597 | /* | |
3598 | * ffs_lock must be taken by the caller of this function | |
3599 | */ | |
da13a773 | 3600 | static void _ffs_free_dev(struct ffs_dev *dev) |
4b187fce AP |
3601 | { |
3602 | list_del(&dev->entry); | |
b658499f AP |
3603 | if (dev->name_allocated) |
3604 | kfree(dev->name); | |
3262ad82 JB |
3605 | |
3606 | /* Clear the private_data pointer to stop incorrect dev access */ | |
3607 | if (dev->ffs_data) | |
3608 | dev->ffs_data->private_data = NULL; | |
3609 | ||
4b187fce AP |
3610 | kfree(dev); |
3611 | if (list_empty(&ffs_devices)) | |
3612 | functionfs_cleanup(); | |
3613 | } | |
3614 | ||
3615 | static void *ffs_acquire_dev(const char *dev_name) | |
3616 | { | |
3617 | struct ffs_dev *ffs_dev; | |
3618 | ||
3619 | ENTER(); | |
3620 | ffs_dev_lock(); | |
3621 | ||
da13a773 | 3622 | ffs_dev = _ffs_find_dev(dev_name); |
4b187fce | 3623 | if (!ffs_dev) |
d668b4f3 | 3624 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3625 | else if (ffs_dev->mounted) |
3626 | ffs_dev = ERR_PTR(-EBUSY); | |
5920cda6 AP |
3627 | else if (ffs_dev->ffs_acquire_dev_callback && |
3628 | ffs_dev->ffs_acquire_dev_callback(ffs_dev)) | |
d668b4f3 | 3629 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3630 | else |
3631 | ffs_dev->mounted = true; | |
3632 | ||
3633 | ffs_dev_unlock(); | |
3634 | return ffs_dev; | |
3635 | } | |
3636 | ||
3637 | static void ffs_release_dev(struct ffs_data *ffs_data) | |
3638 | { | |
3639 | struct ffs_dev *ffs_dev; | |
3640 | ||
3641 | ENTER(); | |
3642 | ffs_dev_lock(); | |
3643 | ||
3644 | ffs_dev = ffs_data->private_data; | |
ea365922 | 3645 | if (ffs_dev) { |
4b187fce | 3646 | ffs_dev->mounted = false; |
ea365922 AP |
3647 | |
3648 | if (ffs_dev->ffs_release_dev_callback) | |
3649 | ffs_dev->ffs_release_dev_callback(ffs_dev); | |
3650 | } | |
4b187fce AP |
3651 | |
3652 | ffs_dev_unlock(); | |
3653 | } | |
3654 | ||
3655 | static int ffs_ready(struct ffs_data *ffs) | |
3656 | { | |
3657 | struct ffs_dev *ffs_obj; | |
3658 | int ret = 0; | |
3659 | ||
3660 | ENTER(); | |
3661 | ffs_dev_lock(); | |
3662 | ||
3663 | ffs_obj = ffs->private_data; | |
3664 | if (!ffs_obj) { | |
3665 | ret = -EINVAL; | |
3666 | goto done; | |
3667 | } | |
3668 | if (WARN_ON(ffs_obj->desc_ready)) { | |
3669 | ret = -EBUSY; | |
3670 | goto done; | |
3671 | } | |
3672 | ||
3673 | ffs_obj->desc_ready = true; | |
3674 | ffs_obj->ffs_data = ffs; | |
3675 | ||
49a79d8b | 3676 | if (ffs_obj->ffs_ready_callback) { |
4b187fce | 3677 | ret = ffs_obj->ffs_ready_callback(ffs); |
49a79d8b KO |
3678 | if (ret) |
3679 | goto done; | |
3680 | } | |
4b187fce | 3681 | |
49a79d8b | 3682 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); |
4b187fce AP |
3683 | done: |
3684 | ffs_dev_unlock(); | |
3685 | return ret; | |
3686 | } | |
3687 | ||
3688 | static void ffs_closed(struct ffs_data *ffs) | |
3689 | { | |
3690 | struct ffs_dev *ffs_obj; | |
f14e9ad1 | 3691 | struct f_fs_opts *opts; |
b3ce3ce0 | 3692 | struct config_item *ci; |
4b187fce AP |
3693 | |
3694 | ENTER(); | |
3695 | ffs_dev_lock(); | |
3696 | ||
3697 | ffs_obj = ffs->private_data; | |
3698 | if (!ffs_obj) | |
3699 | goto done; | |
3700 | ||
3701 | ffs_obj->desc_ready = false; | |
3702 | ||
49a79d8b KO |
3703 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags) && |
3704 | ffs_obj->ffs_closed_callback) | |
4b187fce | 3705 | ffs_obj->ffs_closed_callback(ffs); |
b658499f | 3706 | |
f14e9ad1 RMS |
3707 | if (ffs_obj->opts) |
3708 | opts = ffs_obj->opts; | |
3709 | else | |
3710 | goto done; | |
3711 | ||
3712 | if (opts->no_configfs || !opts->func_inst.group.cg_item.ci_parent | |
2c935bc5 | 3713 | || !kref_read(&opts->func_inst.group.cg_item.ci_kref)) |
b658499f AP |
3714 | goto done; |
3715 | ||
b3ce3ce0 BW |
3716 | ci = opts->func_inst.group.cg_item.ci_parent->ci_parent; |
3717 | ffs_dev_unlock(); | |
3718 | ||
3719 | unregister_gadget_item(ci); | |
3720 | return; | |
4b187fce AP |
3721 | done: |
3722 | ffs_dev_unlock(); | |
3723 | } | |
3724 | ||
ddf8abd2 MN |
3725 | /* Misc helper functions ****************************************************/ |
3726 | ||
3727 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
3728 | { | |
3729 | return nonblock | |
3730 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN | |
3731 | : mutex_lock_interruptible(mutex); | |
3732 | } | |
3733 | ||
260ef311 | 3734 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
3735 | { |
3736 | char *data; | |
3737 | ||
3738 | if (unlikely(!len)) | |
3739 | return NULL; | |
3740 | ||
3741 | data = kmalloc(len, GFP_KERNEL); | |
3742 | if (unlikely(!data)) | |
3743 | return ERR_PTR(-ENOMEM); | |
3744 | ||
7fe9a937 | 3745 | if (unlikely(copy_from_user(data, buf, len))) { |
ddf8abd2 MN |
3746 | kfree(data); |
3747 | return ERR_PTR(-EFAULT); | |
3748 | } | |
3749 | ||
aa02f172 | 3750 | pr_vdebug("Buffer from user space:\n"); |
ddf8abd2 MN |
3751 | ffs_dump_mem("", data, len); |
3752 | ||
3753 | return data; | |
3754 | } | |
5920cda6 | 3755 | |
5920cda6 AP |
3756 | DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc); |
3757 | MODULE_LICENSE("GPL"); | |
3758 | MODULE_AUTHOR("Michal Nazarewicz"); |