Commit | Line | Data |
---|---|---|
ddf8abd2 | 1 | /* |
5ab54cf7 | 2 | * f_fs.c -- user mode file system API for USB composite function controllers |
ddf8abd2 MN |
3 | * |
4 | * Copyright (C) 2010 Samsung Electronics | |
54b8360f | 5 | * Author: Michal Nazarewicz <mina86@mina86.com> |
ddf8abd2 | 6 | * |
5ab54cf7 | 7 | * Based on inode.c (GadgetFS) which was: |
ddf8abd2 MN |
8 | * Copyright (C) 2003-2004 David Brownell |
9 | * Copyright (C) 2003 Agilent Technologies | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
ddf8abd2 MN |
15 | */ |
16 | ||
17 | ||
18 | /* #define DEBUG */ | |
19 | /* #define VERBOSE_DEBUG */ | |
20 | ||
21 | #include <linux/blkdev.h> | |
b0608690 | 22 | #include <linux/pagemap.h> |
f940fcd8 | 23 | #include <linux/export.h> |
560f1187 | 24 | #include <linux/hid.h> |
5920cda6 | 25 | #include <linux/module.h> |
e2e40f2c | 26 | #include <linux/uio.h> |
ddf8abd2 | 27 | #include <asm/unaligned.h> |
ddf8abd2 MN |
28 | |
29 | #include <linux/usb/composite.h> | |
30 | #include <linux/usb/functionfs.h> | |
31 | ||
2e4c7553 RB |
32 | #include <linux/aio.h> |
33 | #include <linux/mmu_context.h> | |
23de91e9 | 34 | #include <linux/poll.h> |
5e33f6fd | 35 | #include <linux/eventfd.h> |
23de91e9 | 36 | |
e72c39c0 | 37 | #include "u_fs.h" |
74d48466 | 38 | #include "u_f.h" |
f0175ab5 | 39 | #include "u_os_desc.h" |
b658499f | 40 | #include "configfs.h" |
ddf8abd2 MN |
41 | |
42 | #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ | |
43 | ||
ddf8abd2 MN |
44 | /* Reference counter handling */ |
45 | static void ffs_data_get(struct ffs_data *ffs); | |
46 | static void ffs_data_put(struct ffs_data *ffs); | |
47 | /* Creates new ffs_data object. */ | |
48 | static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); | |
49 | ||
50 | /* Opened counter handling. */ | |
51 | static void ffs_data_opened(struct ffs_data *ffs); | |
52 | static void ffs_data_closed(struct ffs_data *ffs); | |
53 | ||
5ab54cf7 | 54 | /* Called with ffs->mutex held; take over ownership of data. */ |
ddf8abd2 MN |
55 | static int __must_check |
56 | __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); | |
57 | static int __must_check | |
58 | __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); | |
59 | ||
60 | ||
61 | /* The function structure ***************************************************/ | |
62 | ||
63 | struct ffs_ep; | |
64 | ||
65 | struct ffs_function { | |
66 | struct usb_configuration *conf; | |
67 | struct usb_gadget *gadget; | |
68 | struct ffs_data *ffs; | |
69 | ||
70 | struct ffs_ep *eps; | |
71 | u8 eps_revmap[16]; | |
72 | short *interfaces_nums; | |
73 | ||
74 | struct usb_function function; | |
75 | }; | |
76 | ||
77 | ||
78 | static struct ffs_function *ffs_func_from_usb(struct usb_function *f) | |
79 | { | |
80 | return container_of(f, struct ffs_function, function); | |
81 | } | |
82 | ||
ddf8abd2 | 83 | |
a7ecf054 MN |
84 | static inline enum ffs_setup_state |
85 | ffs_setup_state_clear_cancelled(struct ffs_data *ffs) | |
86 | { | |
87 | return (enum ffs_setup_state) | |
88 | cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); | |
89 | } | |
90 | ||
91 | ||
ddf8abd2 MN |
92 | static void ffs_func_eps_disable(struct ffs_function *func); |
93 | static int __must_check ffs_func_eps_enable(struct ffs_function *func); | |
94 | ||
ddf8abd2 MN |
95 | static int ffs_func_bind(struct usb_configuration *, |
96 | struct usb_function *); | |
ddf8abd2 MN |
97 | static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); |
98 | static void ffs_func_disable(struct usb_function *); | |
99 | static int ffs_func_setup(struct usb_function *, | |
100 | const struct usb_ctrlrequest *); | |
54dfce6d | 101 | static bool ffs_func_req_match(struct usb_function *, |
1a00b457 FH |
102 | const struct usb_ctrlrequest *, |
103 | bool config0); | |
ddf8abd2 MN |
104 | static void ffs_func_suspend(struct usb_function *); |
105 | static void ffs_func_resume(struct usb_function *); | |
106 | ||
107 | ||
108 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); | |
109 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); | |
110 | ||
111 | ||
ddf8abd2 MN |
112 | /* The endpoints structures *************************************************/ |
113 | ||
114 | struct ffs_ep { | |
115 | struct usb_ep *ep; /* P: ffs->eps_lock */ | |
116 | struct usb_request *req; /* P: epfile->mutex */ | |
117 | ||
8d4e897b MG |
118 | /* [0]: full speed, [1]: high speed, [2]: super speed */ |
119 | struct usb_endpoint_descriptor *descs[3]; | |
ddf8abd2 MN |
120 | |
121 | u8 num; | |
122 | ||
123 | int status; /* P: epfile->mutex */ | |
124 | }; | |
125 | ||
126 | struct ffs_epfile { | |
127 | /* Protects ep->ep and ep->req. */ | |
128 | struct mutex mutex; | |
129 | wait_queue_head_t wait; | |
130 | ||
131 | struct ffs_data *ffs; | |
132 | struct ffs_ep *ep; /* P: ffs->eps_lock */ | |
133 | ||
134 | struct dentry *dentry; | |
135 | ||
9353afbb MN |
136 | /* |
137 | * Buffer for holding data from partial reads which may happen since | |
138 | * we’re rounding user read requests to a multiple of a max packet size. | |
a9e6f83c MN |
139 | * |
140 | * The pointer is initialised with NULL value and may be set by | |
141 | * __ffs_epfile_read_data function to point to a temporary buffer. | |
142 | * | |
143 | * In normal operation, calls to __ffs_epfile_read_buffered will consume | |
144 | * data from said buffer and eventually free it. Importantly, while the | |
145 | * function is using the buffer, it sets the pointer to NULL. This is | |
146 | * all right since __ffs_epfile_read_data and __ffs_epfile_read_buffered | |
147 | * can never run concurrently (they are synchronised by epfile->mutex) | |
148 | * so the latter will not assign a new value to the pointer. | |
149 | * | |
150 | * Meanwhile ffs_func_eps_disable frees the buffer (if the pointer is | |
151 | * valid) and sets the pointer to READ_BUFFER_DROP value. This special | |
152 | * value is crux of the synchronisation between ffs_func_eps_disable and | |
153 | * __ffs_epfile_read_data. | |
154 | * | |
155 | * Once __ffs_epfile_read_data is about to finish it will try to set the | |
156 | * pointer back to its old value (as described above), but seeing as the | |
157 | * pointer is not-NULL (namely READ_BUFFER_DROP) it will instead free | |
158 | * the buffer. | |
159 | * | |
160 | * == State transitions == | |
161 | * | |
162 | * • ptr == NULL: (initial state) | |
163 | * ◦ __ffs_epfile_read_buffer_free: go to ptr == DROP | |
164 | * ◦ __ffs_epfile_read_buffered: nop | |
165 | * ◦ __ffs_epfile_read_data allocates temp buffer: go to ptr == buf | |
166 | * ◦ reading finishes: n/a, not in ‘and reading’ state | |
167 | * • ptr == DROP: | |
168 | * ◦ __ffs_epfile_read_buffer_free: nop | |
169 | * ◦ __ffs_epfile_read_buffered: go to ptr == NULL | |
170 | * ◦ __ffs_epfile_read_data allocates temp buffer: free buf, nop | |
171 | * ◦ reading finishes: n/a, not in ‘and reading’ state | |
172 | * • ptr == buf: | |
173 | * ◦ __ffs_epfile_read_buffer_free: free buf, go to ptr == DROP | |
174 | * ◦ __ffs_epfile_read_buffered: go to ptr == NULL and reading | |
175 | * ◦ __ffs_epfile_read_data: n/a, __ffs_epfile_read_buffered | |
176 | * is always called first | |
177 | * ◦ reading finishes: n/a, not in ‘and reading’ state | |
178 | * • ptr == NULL and reading: | |
179 | * ◦ __ffs_epfile_read_buffer_free: go to ptr == DROP and reading | |
180 | * ◦ __ffs_epfile_read_buffered: n/a, mutex is held | |
181 | * ◦ __ffs_epfile_read_data: n/a, mutex is held | |
182 | * ◦ reading finishes and … | |
183 | * … all data read: free buf, go to ptr == NULL | |
184 | * … otherwise: go to ptr == buf and reading | |
185 | * • ptr == DROP and reading: | |
186 | * ◦ __ffs_epfile_read_buffer_free: nop | |
187 | * ◦ __ffs_epfile_read_buffered: n/a, mutex is held | |
188 | * ◦ __ffs_epfile_read_data: n/a, mutex is held | |
189 | * ◦ reading finishes: free buf, go to ptr == DROP | |
9353afbb | 190 | */ |
a9e6f83c MN |
191 | struct ffs_buffer *read_buffer; |
192 | #define READ_BUFFER_DROP ((struct ffs_buffer *)ERR_PTR(-ESHUTDOWN)) | |
9353afbb | 193 | |
ddf8abd2 MN |
194 | char name[5]; |
195 | ||
196 | unsigned char in; /* P: ffs->eps_lock */ | |
197 | unsigned char isoc; /* P: ffs->eps_lock */ | |
198 | ||
199 | unsigned char _pad; | |
200 | }; | |
201 | ||
9353afbb MN |
202 | struct ffs_buffer { |
203 | size_t length; | |
204 | char *data; | |
205 | char storage[]; | |
206 | }; | |
207 | ||
2e4c7553 RB |
208 | /* ffs_io_data structure ***************************************************/ |
209 | ||
210 | struct ffs_io_data { | |
211 | bool aio; | |
212 | bool read; | |
213 | ||
214 | struct kiocb *kiocb; | |
c993c39b AV |
215 | struct iov_iter data; |
216 | const void *to_free; | |
217 | char *buf; | |
2e4c7553 RB |
218 | |
219 | struct mm_struct *mm; | |
220 | struct work_struct work; | |
221 | ||
222 | struct usb_ep *ep; | |
223 | struct usb_request *req; | |
5e33f6fd RB |
224 | |
225 | struct ffs_data *ffs; | |
2e4c7553 RB |
226 | }; |
227 | ||
6d5c1c77 RB |
228 | struct ffs_desc_helper { |
229 | struct ffs_data *ffs; | |
230 | unsigned interfaces_count; | |
231 | unsigned eps_count; | |
232 | }; | |
233 | ||
ddf8abd2 MN |
234 | static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
235 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); | |
236 | ||
1bb27cac | 237 | static struct dentry * |
ddf8abd2 | 238 | ffs_sb_create_file(struct super_block *sb, const char *name, void *data, |
1bb27cac | 239 | const struct file_operations *fops); |
ddf8abd2 | 240 | |
4b187fce AP |
241 | /* Devices management *******************************************************/ |
242 | ||
243 | DEFINE_MUTEX(ffs_lock); | |
0700faaf | 244 | EXPORT_SYMBOL_GPL(ffs_lock); |
4b187fce | 245 | |
da13a773 AP |
246 | static struct ffs_dev *_ffs_find_dev(const char *name); |
247 | static struct ffs_dev *_ffs_alloc_dev(void); | |
b658499f | 248 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name); |
da13a773 | 249 | static void _ffs_free_dev(struct ffs_dev *dev); |
4b187fce AP |
250 | static void *ffs_acquire_dev(const char *dev_name); |
251 | static void ffs_release_dev(struct ffs_data *ffs_data); | |
252 | static int ffs_ready(struct ffs_data *ffs); | |
253 | static void ffs_closed(struct ffs_data *ffs); | |
ddf8abd2 MN |
254 | |
255 | /* Misc helper functions ****************************************************/ | |
256 | ||
257 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
258 | __attribute__((warn_unused_result, nonnull)); | |
260ef311 | 259 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
260 | __attribute__((warn_unused_result, nonnull)); |
261 | ||
262 | ||
263 | /* Control file aka ep0 *****************************************************/ | |
264 | ||
265 | static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) | |
266 | { | |
267 | struct ffs_data *ffs = req->context; | |
268 | ||
5bdcde90 | 269 | complete(&ffs->ep0req_completion); |
ddf8abd2 MN |
270 | } |
271 | ||
ddf8abd2 MN |
272 | static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
273 | { | |
274 | struct usb_request *req = ffs->ep0req; | |
275 | int ret; | |
276 | ||
277 | req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); | |
278 | ||
279 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
280 | ||
281 | req->buf = data; | |
282 | req->length = len; | |
283 | ||
ce1fd358 MS |
284 | /* |
285 | * UDC layer requires to provide a buffer even for ZLP, but should | |
286 | * not use it at all. Let's provide some poisoned pointer to catch | |
287 | * possible bug in the driver. | |
288 | */ | |
289 | if (req->buf == NULL) | |
290 | req->buf = (void *)0xDEADBABE; | |
291 | ||
16735d02 | 292 | reinit_completion(&ffs->ep0req_completion); |
ddf8abd2 MN |
293 | |
294 | ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); | |
295 | if (unlikely(ret < 0)) | |
296 | return ret; | |
297 | ||
298 | ret = wait_for_completion_interruptible(&ffs->ep0req_completion); | |
299 | if (unlikely(ret)) { | |
300 | usb_ep_dequeue(ffs->gadget->ep0, req); | |
301 | return -EINTR; | |
302 | } | |
303 | ||
304 | ffs->setup_state = FFS_NO_SETUP; | |
0a7b1f8a | 305 | return req->status ? req->status : req->actual; |
ddf8abd2 MN |
306 | } |
307 | ||
308 | static int __ffs_ep0_stall(struct ffs_data *ffs) | |
309 | { | |
310 | if (ffs->ev.can_stall) { | |
aa02f172 | 311 | pr_vdebug("ep0 stall\n"); |
ddf8abd2 MN |
312 | usb_ep_set_halt(ffs->gadget->ep0); |
313 | ffs->setup_state = FFS_NO_SETUP; | |
314 | return -EL2HLT; | |
315 | } else { | |
aa02f172 | 316 | pr_debug("bogus ep0 stall!\n"); |
ddf8abd2 MN |
317 | return -ESRCH; |
318 | } | |
319 | } | |
320 | ||
ddf8abd2 MN |
321 | static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
322 | size_t len, loff_t *ptr) | |
323 | { | |
324 | struct ffs_data *ffs = file->private_data; | |
325 | ssize_t ret; | |
326 | char *data; | |
327 | ||
328 | ENTER(); | |
329 | ||
330 | /* Fast check if setup was canceled */ | |
a7ecf054 | 331 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
332 | return -EIDRM; |
333 | ||
334 | /* Acquire mutex */ | |
335 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
336 | if (unlikely(ret < 0)) | |
337 | return ret; | |
338 | ||
ddf8abd2 MN |
339 | /* Check state */ |
340 | switch (ffs->state) { | |
341 | case FFS_READ_DESCRIPTORS: | |
342 | case FFS_READ_STRINGS: | |
343 | /* Copy data */ | |
344 | if (unlikely(len < 16)) { | |
345 | ret = -EINVAL; | |
346 | break; | |
347 | } | |
348 | ||
349 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 350 | if (IS_ERR(data)) { |
ddf8abd2 MN |
351 | ret = PTR_ERR(data); |
352 | break; | |
353 | } | |
354 | ||
355 | /* Handle data */ | |
356 | if (ffs->state == FFS_READ_DESCRIPTORS) { | |
aa02f172 | 357 | pr_info("read descriptors\n"); |
ddf8abd2 MN |
358 | ret = __ffs_data_got_descs(ffs, data, len); |
359 | if (unlikely(ret < 0)) | |
360 | break; | |
361 | ||
362 | ffs->state = FFS_READ_STRINGS; | |
363 | ret = len; | |
364 | } else { | |
aa02f172 | 365 | pr_info("read strings\n"); |
ddf8abd2 MN |
366 | ret = __ffs_data_got_strings(ffs, data, len); |
367 | if (unlikely(ret < 0)) | |
368 | break; | |
369 | ||
370 | ret = ffs_epfiles_create(ffs); | |
371 | if (unlikely(ret)) { | |
372 | ffs->state = FFS_CLOSING; | |
373 | break; | |
374 | } | |
375 | ||
376 | ffs->state = FFS_ACTIVE; | |
377 | mutex_unlock(&ffs->mutex); | |
378 | ||
4b187fce | 379 | ret = ffs_ready(ffs); |
ddf8abd2 MN |
380 | if (unlikely(ret < 0)) { |
381 | ffs->state = FFS_CLOSING; | |
382 | return ret; | |
383 | } | |
384 | ||
ddf8abd2 MN |
385 | return len; |
386 | } | |
387 | break; | |
388 | ||
ddf8abd2 MN |
389 | case FFS_ACTIVE: |
390 | data = NULL; | |
5ab54cf7 MN |
391 | /* |
392 | * We're called from user space, we can use _irq | |
393 | * rather then _irqsave | |
394 | */ | |
ddf8abd2 | 395 | spin_lock_irq(&ffs->ev.waitq.lock); |
a7ecf054 | 396 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 397 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
398 | ret = -EIDRM; |
399 | goto done_spin; | |
400 | ||
401 | case FFS_NO_SETUP: | |
402 | ret = -ESRCH; | |
403 | goto done_spin; | |
404 | ||
405 | case FFS_SETUP_PENDING: | |
406 | break; | |
407 | } | |
408 | ||
409 | /* FFS_SETUP_PENDING */ | |
410 | if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { | |
411 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
412 | ret = __ffs_ep0_stall(ffs); | |
413 | break; | |
414 | } | |
415 | ||
416 | /* FFS_SETUP_PENDING and not stall */ | |
417 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
418 | ||
419 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
420 | ||
421 | data = ffs_prepare_buffer(buf, len); | |
537baabb | 422 | if (IS_ERR(data)) { |
ddf8abd2 MN |
423 | ret = PTR_ERR(data); |
424 | break; | |
425 | } | |
426 | ||
427 | spin_lock_irq(&ffs->ev.waitq.lock); | |
428 | ||
5ab54cf7 MN |
429 | /* |
430 | * We are guaranteed to be still in FFS_ACTIVE state | |
ddf8abd2 | 431 | * but the state of setup could have changed from |
e46318a0 | 432 | * FFS_SETUP_PENDING to FFS_SETUP_CANCELLED so we need |
ddf8abd2 | 433 | * to check for that. If that happened we copied data |
5ab54cf7 MN |
434 | * from user space in vain but it's unlikely. |
435 | * | |
436 | * For sure we are not in FFS_NO_SETUP since this is | |
ddf8abd2 MN |
437 | * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
438 | * transition can be performed and it's protected by | |
5ab54cf7 MN |
439 | * mutex. |
440 | */ | |
a7ecf054 MN |
441 | if (ffs_setup_state_clear_cancelled(ffs) == |
442 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
443 | ret = -EIDRM; |
444 | done_spin: | |
445 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
446 | } else { | |
447 | /* unlocks spinlock */ | |
448 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
449 | } | |
450 | kfree(data); | |
451 | break; | |
452 | ||
ddf8abd2 MN |
453 | default: |
454 | ret = -EBADFD; | |
455 | break; | |
456 | } | |
457 | ||
ddf8abd2 MN |
458 | mutex_unlock(&ffs->mutex); |
459 | return ret; | |
460 | } | |
461 | ||
67913bbd | 462 | /* Called with ffs->ev.waitq.lock and ffs->mutex held, both released on exit. */ |
ddf8abd2 MN |
463 | static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, |
464 | size_t n) | |
465 | { | |
5ab54cf7 | 466 | /* |
67913bbd MN |
467 | * n cannot be bigger than ffs->ev.count, which cannot be bigger than |
468 | * size of ffs->ev.types array (which is four) so that's how much space | |
469 | * we reserve. | |
5ab54cf7 | 470 | */ |
67913bbd MN |
471 | struct usb_functionfs_event events[ARRAY_SIZE(ffs->ev.types)]; |
472 | const size_t size = n * sizeof *events; | |
ddf8abd2 MN |
473 | unsigned i = 0; |
474 | ||
67913bbd | 475 | memset(events, 0, size); |
ddf8abd2 MN |
476 | |
477 | do { | |
478 | events[i].type = ffs->ev.types[i]; | |
479 | if (events[i].type == FUNCTIONFS_SETUP) { | |
480 | events[i].u.setup = ffs->ev.setup; | |
481 | ffs->setup_state = FFS_SETUP_PENDING; | |
482 | } | |
483 | } while (++i < n); | |
484 | ||
67913bbd MN |
485 | ffs->ev.count -= n; |
486 | if (ffs->ev.count) | |
ddf8abd2 MN |
487 | memmove(ffs->ev.types, ffs->ev.types + n, |
488 | ffs->ev.count * sizeof *ffs->ev.types); | |
ddf8abd2 MN |
489 | |
490 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
491 | mutex_unlock(&ffs->mutex); | |
492 | ||
7fe9a937 | 493 | return unlikely(copy_to_user(buf, events, size)) ? -EFAULT : size; |
ddf8abd2 MN |
494 | } |
495 | ||
ddf8abd2 MN |
496 | static ssize_t ffs_ep0_read(struct file *file, char __user *buf, |
497 | size_t len, loff_t *ptr) | |
498 | { | |
499 | struct ffs_data *ffs = file->private_data; | |
500 | char *data = NULL; | |
501 | size_t n; | |
502 | int ret; | |
503 | ||
504 | ENTER(); | |
505 | ||
506 | /* Fast check if setup was canceled */ | |
a7ecf054 | 507 | if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) |
ddf8abd2 MN |
508 | return -EIDRM; |
509 | ||
510 | /* Acquire mutex */ | |
511 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
512 | if (unlikely(ret < 0)) | |
513 | return ret; | |
514 | ||
ddf8abd2 MN |
515 | /* Check state */ |
516 | if (ffs->state != FFS_ACTIVE) { | |
517 | ret = -EBADFD; | |
518 | goto done_mutex; | |
519 | } | |
520 | ||
5ab54cf7 MN |
521 | /* |
522 | * We're called from user space, we can use _irq rather then | |
523 | * _irqsave | |
524 | */ | |
ddf8abd2 MN |
525 | spin_lock_irq(&ffs->ev.waitq.lock); |
526 | ||
a7ecf054 | 527 | switch (ffs_setup_state_clear_cancelled(ffs)) { |
e46318a0 | 528 | case FFS_SETUP_CANCELLED: |
ddf8abd2 MN |
529 | ret = -EIDRM; |
530 | break; | |
531 | ||
532 | case FFS_NO_SETUP: | |
533 | n = len / sizeof(struct usb_functionfs_event); | |
534 | if (unlikely(!n)) { | |
535 | ret = -EINVAL; | |
536 | break; | |
537 | } | |
538 | ||
539 | if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { | |
540 | ret = -EAGAIN; | |
541 | break; | |
542 | } | |
543 | ||
5ab54cf7 MN |
544 | if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, |
545 | ffs->ev.count)) { | |
ddf8abd2 MN |
546 | ret = -EINTR; |
547 | break; | |
548 | } | |
549 | ||
550 | return __ffs_ep0_read_events(ffs, buf, | |
551 | min(n, (size_t)ffs->ev.count)); | |
552 | ||
ddf8abd2 MN |
553 | case FFS_SETUP_PENDING: |
554 | if (ffs->ev.setup.bRequestType & USB_DIR_IN) { | |
555 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
556 | ret = __ffs_ep0_stall(ffs); | |
557 | goto done_mutex; | |
558 | } | |
559 | ||
560 | len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); | |
561 | ||
562 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
563 | ||
564 | if (likely(len)) { | |
565 | data = kmalloc(len, GFP_KERNEL); | |
566 | if (unlikely(!data)) { | |
567 | ret = -ENOMEM; | |
568 | goto done_mutex; | |
569 | } | |
570 | } | |
571 | ||
572 | spin_lock_irq(&ffs->ev.waitq.lock); | |
573 | ||
574 | /* See ffs_ep0_write() */ | |
a7ecf054 MN |
575 | if (ffs_setup_state_clear_cancelled(ffs) == |
576 | FFS_SETUP_CANCELLED) { | |
ddf8abd2 MN |
577 | ret = -EIDRM; |
578 | break; | |
579 | } | |
580 | ||
581 | /* unlocks spinlock */ | |
582 | ret = __ffs_ep0_queue_wait(ffs, data, len); | |
7fe9a937 | 583 | if (likely(ret > 0) && unlikely(copy_to_user(buf, data, len))) |
ddf8abd2 MN |
584 | ret = -EFAULT; |
585 | goto done_mutex; | |
586 | ||
587 | default: | |
588 | ret = -EBADFD; | |
589 | break; | |
590 | } | |
591 | ||
592 | spin_unlock_irq(&ffs->ev.waitq.lock); | |
593 | done_mutex: | |
594 | mutex_unlock(&ffs->mutex); | |
595 | kfree(data); | |
596 | return ret; | |
597 | } | |
598 | ||
ddf8abd2 MN |
599 | static int ffs_ep0_open(struct inode *inode, struct file *file) |
600 | { | |
601 | struct ffs_data *ffs = inode->i_private; | |
602 | ||
603 | ENTER(); | |
604 | ||
605 | if (unlikely(ffs->state == FFS_CLOSING)) | |
606 | return -EBUSY; | |
607 | ||
608 | file->private_data = ffs; | |
609 | ffs_data_opened(ffs); | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
ddf8abd2 MN |
614 | static int ffs_ep0_release(struct inode *inode, struct file *file) |
615 | { | |
616 | struct ffs_data *ffs = file->private_data; | |
617 | ||
618 | ENTER(); | |
619 | ||
620 | ffs_data_closed(ffs); | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
ddf8abd2 MN |
625 | static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) |
626 | { | |
627 | struct ffs_data *ffs = file->private_data; | |
628 | struct usb_gadget *gadget = ffs->gadget; | |
629 | long ret; | |
630 | ||
631 | ENTER(); | |
632 | ||
633 | if (code == FUNCTIONFS_INTERFACE_REVMAP) { | |
634 | struct ffs_function *func = ffs->func; | |
635 | ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; | |
92b0abf8 | 636 | } else if (gadget && gadget->ops->ioctl) { |
ddf8abd2 | 637 | ret = gadget->ops->ioctl(gadget, code, value); |
ddf8abd2 MN |
638 | } else { |
639 | ret = -ENOTTY; | |
640 | } | |
641 | ||
642 | return ret; | |
643 | } | |
644 | ||
23de91e9 RB |
645 | static unsigned int ffs_ep0_poll(struct file *file, poll_table *wait) |
646 | { | |
647 | struct ffs_data *ffs = file->private_data; | |
648 | unsigned int mask = POLLWRNORM; | |
649 | int ret; | |
650 | ||
651 | poll_wait(file, &ffs->ev.waitq, wait); | |
652 | ||
653 | ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); | |
654 | if (unlikely(ret < 0)) | |
655 | return mask; | |
656 | ||
657 | switch (ffs->state) { | |
658 | case FFS_READ_DESCRIPTORS: | |
659 | case FFS_READ_STRINGS: | |
660 | mask |= POLLOUT; | |
661 | break; | |
662 | ||
663 | case FFS_ACTIVE: | |
664 | switch (ffs->setup_state) { | |
665 | case FFS_NO_SETUP: | |
666 | if (ffs->ev.count) | |
667 | mask |= POLLIN; | |
668 | break; | |
669 | ||
670 | case FFS_SETUP_PENDING: | |
671 | case FFS_SETUP_CANCELLED: | |
672 | mask |= (POLLIN | POLLOUT); | |
673 | break; | |
674 | } | |
675 | case FFS_CLOSING: | |
676 | break; | |
18d6b32f RB |
677 | case FFS_DEACTIVATED: |
678 | break; | |
23de91e9 RB |
679 | } |
680 | ||
681 | mutex_unlock(&ffs->mutex); | |
682 | ||
683 | return mask; | |
684 | } | |
685 | ||
ddf8abd2 | 686 | static const struct file_operations ffs_ep0_operations = { |
ddf8abd2 MN |
687 | .llseek = no_llseek, |
688 | ||
689 | .open = ffs_ep0_open, | |
690 | .write = ffs_ep0_write, | |
691 | .read = ffs_ep0_read, | |
692 | .release = ffs_ep0_release, | |
693 | .unlocked_ioctl = ffs_ep0_ioctl, | |
23de91e9 | 694 | .poll = ffs_ep0_poll, |
ddf8abd2 MN |
695 | }; |
696 | ||
697 | ||
698 | /* "Normal" endpoints operations ********************************************/ | |
699 | ||
ddf8abd2 MN |
700 | static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) |
701 | { | |
702 | ENTER(); | |
703 | if (likely(req->context)) { | |
704 | struct ffs_ep *ep = _ep->driver_data; | |
705 | ep->status = req->status ? req->status : req->actual; | |
706 | complete(req->context); | |
707 | } | |
708 | } | |
709 | ||
c662a31b MN |
710 | static ssize_t ffs_copy_to_iter(void *data, int data_len, struct iov_iter *iter) |
711 | { | |
712 | ssize_t ret = copy_to_iter(data, data_len, iter); | |
713 | if (likely(ret == data_len)) | |
714 | return ret; | |
715 | ||
716 | if (unlikely(iov_iter_count(iter))) | |
717 | return -EFAULT; | |
718 | ||
719 | /* | |
720 | * Dear user space developer! | |
721 | * | |
722 | * TL;DR: To stop getting below error message in your kernel log, change | |
723 | * user space code using functionfs to align read buffers to a max | |
724 | * packet size. | |
725 | * | |
726 | * Some UDCs (e.g. dwc3) require request sizes to be a multiple of a max | |
727 | * packet size. When unaligned buffer is passed to functionfs, it | |
728 | * internally uses a larger, aligned buffer so that such UDCs are happy. | |
729 | * | |
730 | * Unfortunately, this means that host may send more data than was | |
731 | * requested in read(2) system call. f_fs doesn’t know what to do with | |
732 | * that excess data so it simply drops it. | |
733 | * | |
734 | * Was the buffer aligned in the first place, no such problem would | |
735 | * happen. | |
736 | * | |
9353afbb MN |
737 | * Data may be dropped only in AIO reads. Synchronous reads are handled |
738 | * by splitting a request into multiple parts. This splitting may still | |
739 | * be a problem though so it’s likely best to align the buffer | |
740 | * regardless of it being AIO or not.. | |
741 | * | |
c662a31b MN |
742 | * This only affects OUT endpoints, i.e. reading data with a read(2), |
743 | * aio_read(2) etc. system calls. Writing data to an IN endpoint is not | |
744 | * affected. | |
745 | */ | |
746 | pr_err("functionfs read size %d > requested size %zd, dropping excess data. " | |
747 | "Align read buffer size to max packet size to avoid the problem.\n", | |
748 | data_len, ret); | |
749 | ||
750 | return ret; | |
751 | } | |
752 | ||
2e4c7553 RB |
753 | static void ffs_user_copy_worker(struct work_struct *work) |
754 | { | |
755 | struct ffs_io_data *io_data = container_of(work, struct ffs_io_data, | |
756 | work); | |
757 | int ret = io_data->req->status ? io_data->req->status : | |
758 | io_data->req->actual; | |
38740a5b | 759 | bool kiocb_has_eventfd = io_data->kiocb->ki_flags & IOCB_EVENTFD; |
2e4c7553 RB |
760 | |
761 | if (io_data->read && ret > 0) { | |
2e4c7553 | 762 | use_mm(io_data->mm); |
c662a31b | 763 | ret = ffs_copy_to_iter(io_data->buf, ret, &io_data->data); |
2e4c7553 RB |
764 | unuse_mm(io_data->mm); |
765 | } | |
766 | ||
04b2fa9f | 767 | io_data->kiocb->ki_complete(io_data->kiocb, ret, ret); |
2e4c7553 | 768 | |
38740a5b | 769 | if (io_data->ffs->ffs_eventfd && !kiocb_has_eventfd) |
5e33f6fd RB |
770 | eventfd_signal(io_data->ffs->ffs_eventfd, 1); |
771 | ||
2e4c7553 RB |
772 | usb_ep_free_request(io_data->ep, io_data->req); |
773 | ||
2e4c7553 | 774 | if (io_data->read) |
c993c39b | 775 | kfree(io_data->to_free); |
2e4c7553 RB |
776 | kfree(io_data->buf); |
777 | kfree(io_data); | |
778 | } | |
779 | ||
780 | static void ffs_epfile_async_io_complete(struct usb_ep *_ep, | |
781 | struct usb_request *req) | |
782 | { | |
783 | struct ffs_io_data *io_data = req->context; | |
784 | ||
785 | ENTER(); | |
786 | ||
787 | INIT_WORK(&io_data->work, ffs_user_copy_worker); | |
788 | schedule_work(&io_data->work); | |
789 | } | |
790 | ||
a9e6f83c MN |
791 | static void __ffs_epfile_read_buffer_free(struct ffs_epfile *epfile) |
792 | { | |
793 | /* | |
794 | * See comment in struct ffs_epfile for full read_buffer pointer | |
795 | * synchronisation story. | |
796 | */ | |
797 | struct ffs_buffer *buf = xchg(&epfile->read_buffer, READ_BUFFER_DROP); | |
798 | if (buf && buf != READ_BUFFER_DROP) | |
799 | kfree(buf); | |
800 | } | |
801 | ||
9353afbb MN |
802 | /* Assumes epfile->mutex is held. */ |
803 | static ssize_t __ffs_epfile_read_buffered(struct ffs_epfile *epfile, | |
804 | struct iov_iter *iter) | |
805 | { | |
a9e6f83c MN |
806 | /* |
807 | * Null out epfile->read_buffer so ffs_func_eps_disable does not free | |
808 | * the buffer while we are using it. See comment in struct ffs_epfile | |
809 | * for full read_buffer pointer synchronisation story. | |
810 | */ | |
811 | struct ffs_buffer *buf = xchg(&epfile->read_buffer, NULL); | |
9353afbb | 812 | ssize_t ret; |
a9e6f83c | 813 | if (!buf || buf == READ_BUFFER_DROP) |
9353afbb MN |
814 | return 0; |
815 | ||
816 | ret = copy_to_iter(buf->data, buf->length, iter); | |
817 | if (buf->length == ret) { | |
818 | kfree(buf); | |
a9e6f83c MN |
819 | return ret; |
820 | } | |
821 | ||
822 | if (unlikely(iov_iter_count(iter))) { | |
9353afbb MN |
823 | ret = -EFAULT; |
824 | } else { | |
825 | buf->length -= ret; | |
826 | buf->data += ret; | |
827 | } | |
a9e6f83c MN |
828 | |
829 | if (cmpxchg(&epfile->read_buffer, NULL, buf)) | |
830 | kfree(buf); | |
831 | ||
9353afbb MN |
832 | return ret; |
833 | } | |
834 | ||
835 | /* Assumes epfile->mutex is held. */ | |
836 | static ssize_t __ffs_epfile_read_data(struct ffs_epfile *epfile, | |
837 | void *data, int data_len, | |
838 | struct iov_iter *iter) | |
839 | { | |
840 | struct ffs_buffer *buf; | |
841 | ||
842 | ssize_t ret = copy_to_iter(data, data_len, iter); | |
843 | if (likely(data_len == ret)) | |
844 | return ret; | |
845 | ||
846 | if (unlikely(iov_iter_count(iter))) | |
847 | return -EFAULT; | |
848 | ||
849 | /* See ffs_copy_to_iter for more context. */ | |
850 | pr_warn("functionfs read size %d > requested size %zd, splitting request into multiple reads.", | |
851 | data_len, ret); | |
852 | ||
853 | data_len -= ret; | |
854 | buf = kmalloc(sizeof(*buf) + data_len, GFP_KERNEL); | |
44963d64 DC |
855 | if (!buf) |
856 | return -ENOMEM; | |
9353afbb MN |
857 | buf->length = data_len; |
858 | buf->data = buf->storage; | |
859 | memcpy(buf->storage, data + ret, data_len); | |
a9e6f83c MN |
860 | |
861 | /* | |
862 | * At this point read_buffer is NULL or READ_BUFFER_DROP (if | |
863 | * ffs_func_eps_disable has been called in the meanwhile). See comment | |
864 | * in struct ffs_epfile for full read_buffer pointer synchronisation | |
865 | * story. | |
866 | */ | |
867 | if (unlikely(cmpxchg(&epfile->read_buffer, NULL, buf))) | |
868 | kfree(buf); | |
9353afbb MN |
869 | |
870 | return ret; | |
871 | } | |
872 | ||
2e4c7553 | 873 | static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data) |
ddf8abd2 MN |
874 | { |
875 | struct ffs_epfile *epfile = file->private_data; | |
ae76e134 | 876 | struct usb_request *req; |
ddf8abd2 MN |
877 | struct ffs_ep *ep; |
878 | char *data = NULL; | |
c0d31b3c | 879 | ssize_t ret, data_len = -EINVAL; |
ddf8abd2 MN |
880 | int halt; |
881 | ||
7fa68034 | 882 | /* Are we still active? */ |
b3591f67 MN |
883 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) |
884 | return -ENODEV; | |
ddf8abd2 | 885 | |
7fa68034 MN |
886 | /* Wait for endpoint to be enabled */ |
887 | ep = epfile->ep; | |
888 | if (!ep) { | |
b3591f67 MN |
889 | if (file->f_flags & O_NONBLOCK) |
890 | return -EAGAIN; | |
ddf8abd2 | 891 | |
7fa68034 | 892 | ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep)); |
b3591f67 MN |
893 | if (ret) |
894 | return -EINTR; | |
7fa68034 | 895 | } |
ddf8abd2 | 896 | |
7fa68034 | 897 | /* Do we halt? */ |
2e4c7553 | 898 | halt = (!io_data->read == !epfile->in); |
b3591f67 MN |
899 | if (halt && epfile->isoc) |
900 | return -EINVAL; | |
ddf8abd2 | 901 | |
9353afbb MN |
902 | /* We will be using request and read_buffer */ |
903 | ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); | |
904 | if (unlikely(ret)) | |
905 | goto error; | |
906 | ||
7fa68034 MN |
907 | /* Allocate & copy */ |
908 | if (!halt) { | |
9353afbb MN |
909 | struct usb_gadget *gadget; |
910 | ||
911 | /* | |
912 | * Do we have buffered data from previous partial read? Check | |
913 | * that for synchronous case only because we do not have | |
914 | * facility to ‘wake up’ a pending asynchronous read and push | |
915 | * buffered data to it which we would need to make things behave | |
916 | * consistently. | |
917 | */ | |
918 | if (!io_data->aio && io_data->read) { | |
919 | ret = __ffs_epfile_read_buffered(epfile, &io_data->data); | |
920 | if (ret) | |
921 | goto error_mutex; | |
922 | } | |
923 | ||
f0f42204 AP |
924 | /* |
925 | * if we _do_ wait above, the epfile->ffs->gadget might be NULL | |
ae76e134 MN |
926 | * before the waiting completes, so do not assign to 'gadget' |
927 | * earlier | |
f0f42204 | 928 | */ |
9353afbb | 929 | gadget = epfile->ffs->gadget; |
f0f42204 | 930 | |
97839ca4 CB |
931 | spin_lock_irq(&epfile->ffs->eps_lock); |
932 | /* In the meantime, endpoint got disabled or changed. */ | |
933 | if (epfile->ep != ep) { | |
9353afbb MN |
934 | ret = -ESHUTDOWN; |
935 | goto error_lock; | |
97839ca4 | 936 | } |
c993c39b | 937 | data_len = iov_iter_count(&io_data->data); |
219580e6 MN |
938 | /* |
939 | * Controller may require buffer size to be aligned to | |
940 | * maxpacketsize of an out endpoint. | |
941 | */ | |
c993c39b AV |
942 | if (io_data->read) |
943 | data_len = usb_ep_align_maybe(gadget, ep->ep, data_len); | |
97839ca4 | 944 | spin_unlock_irq(&epfile->ffs->eps_lock); |
219580e6 MN |
945 | |
946 | data = kmalloc(data_len, GFP_KERNEL); | |
9353afbb MN |
947 | if (unlikely(!data)) { |
948 | ret = -ENOMEM; | |
949 | goto error_mutex; | |
950 | } | |
951 | if (!io_data->read && | |
cbbd26b8 | 952 | !copy_from_iter_full(data, data_len, &io_data->data)) { |
9353afbb MN |
953 | ret = -EFAULT; |
954 | goto error_mutex; | |
7fa68034 MN |
955 | } |
956 | } | |
ddf8abd2 | 957 | |
7fa68034 | 958 | spin_lock_irq(&epfile->ffs->eps_lock); |
ddf8abd2 | 959 | |
7fa68034 MN |
960 | if (epfile->ep != ep) { |
961 | /* In the meantime, endpoint got disabled or changed. */ | |
962 | ret = -ESHUTDOWN; | |
7fa68034 MN |
963 | } else if (halt) { |
964 | /* Halt */ | |
ddf8abd2 MN |
965 | if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) |
966 | usb_ep_set_halt(ep->ep); | |
ddf8abd2 | 967 | ret = -EBADMSG; |
ae76e134 | 968 | } else if (unlikely(data_len == -EINVAL)) { |
c0d31b3c DC |
969 | /* |
970 | * Sanity Check: even though data_len can't be used | |
971 | * uninitialized at the time I write this comment, some | |
972 | * compilers complain about this situation. | |
973 | * In order to keep the code clean from warnings, data_len is | |
974 | * being initialized to -EINVAL during its declaration, which | |
975 | * means we can't rely on compiler anymore to warn no future | |
976 | * changes won't result in data_len being used uninitialized. | |
977 | * For such reason, we're adding this redundant sanity check | |
978 | * here. | |
979 | */ | |
ae76e134 MN |
980 | WARN(1, "%s: data_len == -EINVAL\n", __func__); |
981 | ret = -EINVAL; | |
982 | } else if (!io_data->aio) { | |
983 | DECLARE_COMPLETION_ONSTACK(done); | |
ef150884 | 984 | bool interrupted = false; |
ddf8abd2 | 985 | |
ae76e134 MN |
986 | req = ep->req; |
987 | req->buf = data; | |
988 | req->length = data_len; | |
ddf8abd2 | 989 | |
ae76e134 MN |
990 | req->context = &done; |
991 | req->complete = ffs_epfile_io_complete; | |
2e4c7553 | 992 | |
ae76e134 MN |
993 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); |
994 | if (unlikely(ret < 0)) | |
995 | goto error_lock; | |
2e4c7553 | 996 | |
ae76e134 | 997 | spin_unlock_irq(&epfile->ffs->eps_lock); |
2e4c7553 | 998 | |
ae76e134 | 999 | if (unlikely(wait_for_completion_interruptible(&done))) { |
ef150884 DC |
1000 | /* |
1001 | * To avoid race condition with ffs_epfile_io_complete, | |
1002 | * dequeue the request first then check | |
1003 | * status. usb_ep_dequeue API should guarantee no race | |
1004 | * condition with req->complete callback. | |
1005 | */ | |
ae76e134 | 1006 | usb_ep_dequeue(ep->ep, req); |
ef150884 | 1007 | interrupted = ep->status < 0; |
ae76e134 | 1008 | } |
2e4c7553 | 1009 | |
c662a31b MN |
1010 | if (interrupted) |
1011 | ret = -EINTR; | |
1012 | else if (io_data->read && ep->status > 0) | |
9353afbb MN |
1013 | ret = __ffs_epfile_read_data(epfile, data, ep->status, |
1014 | &io_data->data); | |
c662a31b MN |
1015 | else |
1016 | ret = ep->status; | |
ae76e134 MN |
1017 | goto error_mutex; |
1018 | } else if (!(req = usb_ep_alloc_request(ep->ep, GFP_KERNEL))) { | |
1019 | ret = -ENOMEM; | |
1020 | } else { | |
1021 | req->buf = data; | |
1022 | req->length = data_len; | |
2e4c7553 | 1023 | |
ae76e134 MN |
1024 | io_data->buf = data; |
1025 | io_data->ep = ep->ep; | |
1026 | io_data->req = req; | |
1027 | io_data->ffs = epfile->ffs; | |
2e4c7553 | 1028 | |
ae76e134 MN |
1029 | req->context = io_data; |
1030 | req->complete = ffs_epfile_async_io_complete; | |
2e4c7553 | 1031 | |
ae76e134 MN |
1032 | ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); |
1033 | if (unlikely(ret)) { | |
1034 | usb_ep_free_request(ep->ep, req); | |
1035 | goto error_lock; | |
ddf8abd2 | 1036 | } |
ddf8abd2 | 1037 | |
ae76e134 MN |
1038 | ret = -EIOCBQUEUED; |
1039 | /* | |
1040 | * Do not kfree the buffer in this function. It will be freed | |
1041 | * by ffs_user_copy_worker. | |
1042 | */ | |
1043 | data = NULL; | |
1044 | } | |
48968f8d RB |
1045 | |
1046 | error_lock: | |
1047 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
ae76e134 | 1048 | error_mutex: |
48968f8d | 1049 | mutex_unlock(&epfile->mutex); |
ddf8abd2 MN |
1050 | error: |
1051 | kfree(data); | |
1052 | return ret; | |
1053 | } | |
1054 | ||
ddf8abd2 MN |
1055 | static int |
1056 | ffs_epfile_open(struct inode *inode, struct file *file) | |
1057 | { | |
1058 | struct ffs_epfile *epfile = inode->i_private; | |
1059 | ||
1060 | ENTER(); | |
1061 | ||
1062 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
1063 | return -ENODEV; | |
1064 | ||
1065 | file->private_data = epfile; | |
1066 | ffs_data_opened(epfile->ffs); | |
1067 | ||
1068 | return 0; | |
1069 | } | |
1070 | ||
2e4c7553 RB |
1071 | static int ffs_aio_cancel(struct kiocb *kiocb) |
1072 | { | |
1073 | struct ffs_io_data *io_data = kiocb->private; | |
1074 | struct ffs_epfile *epfile = kiocb->ki_filp->private_data; | |
1075 | int value; | |
1076 | ||
1077 | ENTER(); | |
1078 | ||
1079 | spin_lock_irq(&epfile->ffs->eps_lock); | |
1080 | ||
1081 | if (likely(io_data && io_data->ep && io_data->req)) | |
1082 | value = usb_ep_dequeue(io_data->ep, io_data->req); | |
1083 | else | |
1084 | value = -EINVAL; | |
1085 | ||
1086 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1087 | ||
1088 | return value; | |
1089 | } | |
1090 | ||
70e60d91 | 1091 | static ssize_t ffs_epfile_write_iter(struct kiocb *kiocb, struct iov_iter *from) |
2e4c7553 | 1092 | { |
70e60d91 | 1093 | struct ffs_io_data io_data, *p = &io_data; |
de2080d4 | 1094 | ssize_t res; |
2e4c7553 RB |
1095 | |
1096 | ENTER(); | |
1097 | ||
70e60d91 AV |
1098 | if (!is_sync_kiocb(kiocb)) { |
1099 | p = kmalloc(sizeof(io_data), GFP_KERNEL); | |
1100 | if (unlikely(!p)) | |
1101 | return -ENOMEM; | |
1102 | p->aio = true; | |
1103 | } else { | |
1104 | p->aio = false; | |
1105 | } | |
2e4c7553 | 1106 | |
70e60d91 AV |
1107 | p->read = false; |
1108 | p->kiocb = kiocb; | |
1109 | p->data = *from; | |
1110 | p->mm = current->mm; | |
2e4c7553 | 1111 | |
70e60d91 | 1112 | kiocb->private = p; |
2e4c7553 | 1113 | |
4088acf1 RMS |
1114 | if (p->aio) |
1115 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
2e4c7553 | 1116 | |
70e60d91 AV |
1117 | res = ffs_epfile_io(kiocb->ki_filp, p); |
1118 | if (res == -EIOCBQUEUED) | |
1119 | return res; | |
1120 | if (p->aio) | |
1121 | kfree(p); | |
1122 | else | |
1123 | *from = p->data; | |
de2080d4 | 1124 | return res; |
2e4c7553 RB |
1125 | } |
1126 | ||
70e60d91 | 1127 | static ssize_t ffs_epfile_read_iter(struct kiocb *kiocb, struct iov_iter *to) |
2e4c7553 | 1128 | { |
70e60d91 | 1129 | struct ffs_io_data io_data, *p = &io_data; |
de2080d4 | 1130 | ssize_t res; |
2e4c7553 RB |
1131 | |
1132 | ENTER(); | |
1133 | ||
70e60d91 AV |
1134 | if (!is_sync_kiocb(kiocb)) { |
1135 | p = kmalloc(sizeof(io_data), GFP_KERNEL); | |
1136 | if (unlikely(!p)) | |
1137 | return -ENOMEM; | |
1138 | p->aio = true; | |
1139 | } else { | |
1140 | p->aio = false; | |
2e4c7553 RB |
1141 | } |
1142 | ||
70e60d91 AV |
1143 | p->read = true; |
1144 | p->kiocb = kiocb; | |
1145 | if (p->aio) { | |
1146 | p->to_free = dup_iter(&p->data, to, GFP_KERNEL); | |
1147 | if (!p->to_free) { | |
1148 | kfree(p); | |
1149 | return -ENOMEM; | |
1150 | } | |
1151 | } else { | |
1152 | p->data = *to; | |
1153 | p->to_free = NULL; | |
1154 | } | |
1155 | p->mm = current->mm; | |
2e4c7553 | 1156 | |
70e60d91 | 1157 | kiocb->private = p; |
2e4c7553 | 1158 | |
4088acf1 RMS |
1159 | if (p->aio) |
1160 | kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); | |
2e4c7553 | 1161 | |
70e60d91 AV |
1162 | res = ffs_epfile_io(kiocb->ki_filp, p); |
1163 | if (res == -EIOCBQUEUED) | |
1164 | return res; | |
1165 | ||
1166 | if (p->aio) { | |
1167 | kfree(p->to_free); | |
1168 | kfree(p); | |
1169 | } else { | |
1170 | *to = p->data; | |
de2080d4 AV |
1171 | } |
1172 | return res; | |
2e4c7553 RB |
1173 | } |
1174 | ||
ddf8abd2 MN |
1175 | static int |
1176 | ffs_epfile_release(struct inode *inode, struct file *file) | |
1177 | { | |
1178 | struct ffs_epfile *epfile = inode->i_private; | |
1179 | ||
1180 | ENTER(); | |
1181 | ||
a9e6f83c | 1182 | __ffs_epfile_read_buffer_free(epfile); |
ddf8abd2 MN |
1183 | ffs_data_closed(epfile->ffs); |
1184 | ||
1185 | return 0; | |
1186 | } | |
1187 | ||
ddf8abd2 MN |
1188 | static long ffs_epfile_ioctl(struct file *file, unsigned code, |
1189 | unsigned long value) | |
1190 | { | |
1191 | struct ffs_epfile *epfile = file->private_data; | |
1192 | int ret; | |
1193 | ||
1194 | ENTER(); | |
1195 | ||
1196 | if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) | |
1197 | return -ENODEV; | |
1198 | ||
1199 | spin_lock_irq(&epfile->ffs->eps_lock); | |
1200 | if (likely(epfile->ep)) { | |
1201 | switch (code) { | |
1202 | case FUNCTIONFS_FIFO_STATUS: | |
1203 | ret = usb_ep_fifo_status(epfile->ep->ep); | |
1204 | break; | |
1205 | case FUNCTIONFS_FIFO_FLUSH: | |
1206 | usb_ep_fifo_flush(epfile->ep->ep); | |
1207 | ret = 0; | |
1208 | break; | |
1209 | case FUNCTIONFS_CLEAR_HALT: | |
1210 | ret = usb_ep_clear_halt(epfile->ep->ep); | |
1211 | break; | |
1212 | case FUNCTIONFS_ENDPOINT_REVMAP: | |
1213 | ret = epfile->ep->num; | |
1214 | break; | |
c559a353 RB |
1215 | case FUNCTIONFS_ENDPOINT_DESC: |
1216 | { | |
1217 | int desc_idx; | |
1218 | struct usb_endpoint_descriptor *desc; | |
1219 | ||
1220 | switch (epfile->ffs->gadget->speed) { | |
1221 | case USB_SPEED_SUPER: | |
1222 | desc_idx = 2; | |
1223 | break; | |
1224 | case USB_SPEED_HIGH: | |
1225 | desc_idx = 1; | |
1226 | break; | |
1227 | default: | |
1228 | desc_idx = 0; | |
1229 | } | |
1230 | desc = epfile->ep->descs[desc_idx]; | |
1231 | ||
1232 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1233 | ret = copy_to_user((void *)value, desc, sizeof(*desc)); | |
1234 | if (ret) | |
1235 | ret = -EFAULT; | |
1236 | return ret; | |
1237 | } | |
ddf8abd2 MN |
1238 | default: |
1239 | ret = -ENOTTY; | |
1240 | } | |
1241 | } else { | |
1242 | ret = -ENODEV; | |
1243 | } | |
1244 | spin_unlock_irq(&epfile->ffs->eps_lock); | |
1245 | ||
1246 | return ret; | |
1247 | } | |
1248 | ||
ddf8abd2 | 1249 | static const struct file_operations ffs_epfile_operations = { |
ddf8abd2 MN |
1250 | .llseek = no_llseek, |
1251 | ||
1252 | .open = ffs_epfile_open, | |
70e60d91 AV |
1253 | .write_iter = ffs_epfile_write_iter, |
1254 | .read_iter = ffs_epfile_read_iter, | |
ddf8abd2 MN |
1255 | .release = ffs_epfile_release, |
1256 | .unlocked_ioctl = ffs_epfile_ioctl, | |
1257 | }; | |
1258 | ||
1259 | ||
ddf8abd2 MN |
1260 | /* File system and super block operations ***********************************/ |
1261 | ||
1262 | /* | |
5ab54cf7 | 1263 | * Mounting the file system creates a controller file, used first for |
ddf8abd2 MN |
1264 | * function configuration then later for event monitoring. |
1265 | */ | |
1266 | ||
ddf8abd2 MN |
1267 | static struct inode *__must_check |
1268 | ffs_sb_make_inode(struct super_block *sb, void *data, | |
1269 | const struct file_operations *fops, | |
1270 | const struct inode_operations *iops, | |
1271 | struct ffs_file_perms *perms) | |
1272 | { | |
1273 | struct inode *inode; | |
1274 | ||
1275 | ENTER(); | |
1276 | ||
1277 | inode = new_inode(sb); | |
1278 | ||
1279 | if (likely(inode)) { | |
078cd827 | 1280 | struct timespec ts = current_time(inode); |
ddf8abd2 | 1281 | |
12ba8d1e | 1282 | inode->i_ino = get_next_ino(); |
ddf8abd2 MN |
1283 | inode->i_mode = perms->mode; |
1284 | inode->i_uid = perms->uid; | |
1285 | inode->i_gid = perms->gid; | |
078cd827 DD |
1286 | inode->i_atime = ts; |
1287 | inode->i_mtime = ts; | |
1288 | inode->i_ctime = ts; | |
ddf8abd2 MN |
1289 | inode->i_private = data; |
1290 | if (fops) | |
1291 | inode->i_fop = fops; | |
1292 | if (iops) | |
1293 | inode->i_op = iops; | |
1294 | } | |
1295 | ||
1296 | return inode; | |
1297 | } | |
1298 | ||
ddf8abd2 | 1299 | /* Create "regular" file */ |
1bb27cac | 1300 | static struct dentry *ffs_sb_create_file(struct super_block *sb, |
ddf8abd2 | 1301 | const char *name, void *data, |
1bb27cac | 1302 | const struct file_operations *fops) |
ddf8abd2 MN |
1303 | { |
1304 | struct ffs_data *ffs = sb->s_fs_info; | |
1305 | struct dentry *dentry; | |
1306 | struct inode *inode; | |
1307 | ||
1308 | ENTER(); | |
1309 | ||
1310 | dentry = d_alloc_name(sb->s_root, name); | |
1311 | if (unlikely(!dentry)) | |
1312 | return NULL; | |
1313 | ||
1314 | inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); | |
1315 | if (unlikely(!inode)) { | |
1316 | dput(dentry); | |
1317 | return NULL; | |
1318 | } | |
1319 | ||
1320 | d_add(dentry, inode); | |
1bb27cac | 1321 | return dentry; |
ddf8abd2 MN |
1322 | } |
1323 | ||
ddf8abd2 | 1324 | /* Super block */ |
ddf8abd2 MN |
1325 | static const struct super_operations ffs_sb_operations = { |
1326 | .statfs = simple_statfs, | |
1327 | .drop_inode = generic_delete_inode, | |
1328 | }; | |
1329 | ||
1330 | struct ffs_sb_fill_data { | |
1331 | struct ffs_file_perms perms; | |
1332 | umode_t root_mode; | |
1333 | const char *dev_name; | |
18d6b32f | 1334 | bool no_disconnect; |
2606b28a | 1335 | struct ffs_data *ffs_data; |
ddf8abd2 MN |
1336 | }; |
1337 | ||
1338 | static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) | |
1339 | { | |
1340 | struct ffs_sb_fill_data *data = _data; | |
1341 | struct inode *inode; | |
2606b28a | 1342 | struct ffs_data *ffs = data->ffs_data; |
ddf8abd2 MN |
1343 | |
1344 | ENTER(); | |
1345 | ||
ddf8abd2 | 1346 | ffs->sb = sb; |
2606b28a | 1347 | data->ffs_data = NULL; |
ddf8abd2 | 1348 | sb->s_fs_info = ffs; |
09cbfeaf KS |
1349 | sb->s_blocksize = PAGE_SIZE; |
1350 | sb->s_blocksize_bits = PAGE_SHIFT; | |
ddf8abd2 MN |
1351 | sb->s_magic = FUNCTIONFS_MAGIC; |
1352 | sb->s_op = &ffs_sb_operations; | |
1353 | sb->s_time_gran = 1; | |
1354 | ||
1355 | /* Root inode */ | |
1356 | data->perms.mode = data->root_mode; | |
1357 | inode = ffs_sb_make_inode(sb, NULL, | |
1358 | &simple_dir_operations, | |
1359 | &simple_dir_inode_operations, | |
1360 | &data->perms); | |
48fde701 AV |
1361 | sb->s_root = d_make_root(inode); |
1362 | if (unlikely(!sb->s_root)) | |
2606b28a | 1363 | return -ENOMEM; |
ddf8abd2 MN |
1364 | |
1365 | /* EP0 file */ | |
1366 | if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, | |
1bb27cac | 1367 | &ffs_ep0_operations))) |
2606b28a | 1368 | return -ENOMEM; |
ddf8abd2 MN |
1369 | |
1370 | return 0; | |
ddf8abd2 MN |
1371 | } |
1372 | ||
ddf8abd2 MN |
1373 | static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) |
1374 | { | |
1375 | ENTER(); | |
1376 | ||
1377 | if (!opts || !*opts) | |
1378 | return 0; | |
1379 | ||
1380 | for (;;) { | |
ddf8abd2 | 1381 | unsigned long value; |
afd2e186 | 1382 | char *eq, *comma; |
ddf8abd2 MN |
1383 | |
1384 | /* Option limit */ | |
1385 | comma = strchr(opts, ','); | |
1386 | if (comma) | |
1387 | *comma = 0; | |
1388 | ||
1389 | /* Value limit */ | |
1390 | eq = strchr(opts, '='); | |
1391 | if (unlikely(!eq)) { | |
aa02f172 | 1392 | pr_err("'=' missing in %s\n", opts); |
ddf8abd2 MN |
1393 | return -EINVAL; |
1394 | } | |
1395 | *eq = 0; | |
1396 | ||
1397 | /* Parse value */ | |
afd2e186 | 1398 | if (kstrtoul(eq + 1, 0, &value)) { |
aa02f172 | 1399 | pr_err("%s: invalid value: %s\n", opts, eq + 1); |
ddf8abd2 MN |
1400 | return -EINVAL; |
1401 | } | |
1402 | ||
1403 | /* Interpret option */ | |
1404 | switch (eq - opts) { | |
18d6b32f RB |
1405 | case 13: |
1406 | if (!memcmp(opts, "no_disconnect", 13)) | |
1407 | data->no_disconnect = !!value; | |
1408 | else | |
1409 | goto invalid; | |
1410 | break; | |
ddf8abd2 MN |
1411 | case 5: |
1412 | if (!memcmp(opts, "rmode", 5)) | |
1413 | data->root_mode = (value & 0555) | S_IFDIR; | |
1414 | else if (!memcmp(opts, "fmode", 5)) | |
1415 | data->perms.mode = (value & 0666) | S_IFREG; | |
1416 | else | |
1417 | goto invalid; | |
1418 | break; | |
1419 | ||
1420 | case 4: | |
1421 | if (!memcmp(opts, "mode", 4)) { | |
1422 | data->root_mode = (value & 0555) | S_IFDIR; | |
1423 | data->perms.mode = (value & 0666) | S_IFREG; | |
1424 | } else { | |
1425 | goto invalid; | |
1426 | } | |
1427 | break; | |
1428 | ||
1429 | case 3: | |
b9b73f7c EB |
1430 | if (!memcmp(opts, "uid", 3)) { |
1431 | data->perms.uid = make_kuid(current_user_ns(), value); | |
1432 | if (!uid_valid(data->perms.uid)) { | |
1433 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1434 | return -EINVAL; | |
1435 | } | |
b8100750 | 1436 | } else if (!memcmp(opts, "gid", 3)) { |
b9b73f7c EB |
1437 | data->perms.gid = make_kgid(current_user_ns(), value); |
1438 | if (!gid_valid(data->perms.gid)) { | |
1439 | pr_err("%s: unmapped value: %lu\n", opts, value); | |
1440 | return -EINVAL; | |
1441 | } | |
b8100750 | 1442 | } else { |
ddf8abd2 | 1443 | goto invalid; |
b8100750 | 1444 | } |
ddf8abd2 MN |
1445 | break; |
1446 | ||
1447 | default: | |
1448 | invalid: | |
aa02f172 | 1449 | pr_err("%s: invalid option\n", opts); |
ddf8abd2 MN |
1450 | return -EINVAL; |
1451 | } | |
1452 | ||
1453 | /* Next iteration */ | |
1454 | if (!comma) | |
1455 | break; | |
1456 | opts = comma + 1; | |
1457 | } | |
1458 | ||
1459 | return 0; | |
1460 | } | |
1461 | ||
ddf8abd2 MN |
1462 | /* "mount -t functionfs dev_name /dev/function" ends up here */ |
1463 | ||
fc14f2fe AV |
1464 | static struct dentry * |
1465 | ffs_fs_mount(struct file_system_type *t, int flags, | |
1466 | const char *dev_name, void *opts) | |
ddf8abd2 MN |
1467 | { |
1468 | struct ffs_sb_fill_data data = { | |
1469 | .perms = { | |
1470 | .mode = S_IFREG | 0600, | |
b9b73f7c EB |
1471 | .uid = GLOBAL_ROOT_UID, |
1472 | .gid = GLOBAL_ROOT_GID, | |
ddf8abd2 MN |
1473 | }, |
1474 | .root_mode = S_IFDIR | 0500, | |
18d6b32f | 1475 | .no_disconnect = false, |
ddf8abd2 | 1476 | }; |
581791f5 | 1477 | struct dentry *rv; |
ddf8abd2 | 1478 | int ret; |
581791f5 | 1479 | void *ffs_dev; |
2606b28a | 1480 | struct ffs_data *ffs; |
ddf8abd2 MN |
1481 | |
1482 | ENTER(); | |
1483 | ||
ddf8abd2 MN |
1484 | ret = ffs_fs_parse_opts(&data, opts); |
1485 | if (unlikely(ret < 0)) | |
fc14f2fe | 1486 | return ERR_PTR(ret); |
ddf8abd2 | 1487 | |
2606b28a AV |
1488 | ffs = ffs_data_new(); |
1489 | if (unlikely(!ffs)) | |
1490 | return ERR_PTR(-ENOMEM); | |
1491 | ffs->file_perms = data.perms; | |
18d6b32f | 1492 | ffs->no_disconnect = data.no_disconnect; |
2606b28a AV |
1493 | |
1494 | ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); | |
1495 | if (unlikely(!ffs->dev_name)) { | |
1496 | ffs_data_put(ffs); | |
1497 | return ERR_PTR(-ENOMEM); | |
1498 | } | |
1499 | ||
4b187fce | 1500 | ffs_dev = ffs_acquire_dev(dev_name); |
2606b28a AV |
1501 | if (IS_ERR(ffs_dev)) { |
1502 | ffs_data_put(ffs); | |
1503 | return ERR_CAST(ffs_dev); | |
1504 | } | |
1505 | ffs->private_data = ffs_dev; | |
1506 | data.ffs_data = ffs; | |
581791f5 | 1507 | |
581791f5 | 1508 | rv = mount_nodev(t, flags, &data, ffs_sb_fill); |
2606b28a | 1509 | if (IS_ERR(rv) && data.ffs_data) { |
4b187fce | 1510 | ffs_release_dev(data.ffs_data); |
2606b28a AV |
1511 | ffs_data_put(data.ffs_data); |
1512 | } | |
581791f5 | 1513 | return rv; |
ddf8abd2 MN |
1514 | } |
1515 | ||
1516 | static void | |
1517 | ffs_fs_kill_sb(struct super_block *sb) | |
1518 | { | |
ddf8abd2 MN |
1519 | ENTER(); |
1520 | ||
1521 | kill_litter_super(sb); | |
581791f5 | 1522 | if (sb->s_fs_info) { |
4b187fce | 1523 | ffs_release_dev(sb->s_fs_info); |
18d6b32f | 1524 | ffs_data_closed(sb->s_fs_info); |
5b5f9560 | 1525 | ffs_data_put(sb->s_fs_info); |
581791f5 | 1526 | } |
ddf8abd2 MN |
1527 | } |
1528 | ||
1529 | static struct file_system_type ffs_fs_type = { | |
1530 | .owner = THIS_MODULE, | |
1531 | .name = "functionfs", | |
fc14f2fe | 1532 | .mount = ffs_fs_mount, |
ddf8abd2 MN |
1533 | .kill_sb = ffs_fs_kill_sb, |
1534 | }; | |
7f78e035 | 1535 | MODULE_ALIAS_FS("functionfs"); |
ddf8abd2 MN |
1536 | |
1537 | ||
ddf8abd2 MN |
1538 | /* Driver's main init/cleanup functions *************************************/ |
1539 | ||
ddf8abd2 MN |
1540 | static int functionfs_init(void) |
1541 | { | |
1542 | int ret; | |
1543 | ||
1544 | ENTER(); | |
1545 | ||
1546 | ret = register_filesystem(&ffs_fs_type); | |
1547 | if (likely(!ret)) | |
aa02f172 | 1548 | pr_info("file system registered\n"); |
ddf8abd2 | 1549 | else |
aa02f172 | 1550 | pr_err("failed registering file system (%d)\n", ret); |
ddf8abd2 MN |
1551 | |
1552 | return ret; | |
1553 | } | |
1554 | ||
1555 | static void functionfs_cleanup(void) | |
1556 | { | |
1557 | ENTER(); | |
1558 | ||
aa02f172 | 1559 | pr_info("unloading\n"); |
ddf8abd2 MN |
1560 | unregister_filesystem(&ffs_fs_type); |
1561 | } | |
1562 | ||
1563 | ||
ddf8abd2 MN |
1564 | /* ffs_data and ffs_function construction and destruction code **************/ |
1565 | ||
1566 | static void ffs_data_clear(struct ffs_data *ffs); | |
1567 | static void ffs_data_reset(struct ffs_data *ffs); | |
1568 | ||
ddf8abd2 MN |
1569 | static void ffs_data_get(struct ffs_data *ffs) |
1570 | { | |
1571 | ENTER(); | |
1572 | ||
1573 | atomic_inc(&ffs->ref); | |
1574 | } | |
1575 | ||
1576 | static void ffs_data_opened(struct ffs_data *ffs) | |
1577 | { | |
1578 | ENTER(); | |
1579 | ||
1580 | atomic_inc(&ffs->ref); | |
18d6b32f RB |
1581 | if (atomic_add_return(1, &ffs->opened) == 1 && |
1582 | ffs->state == FFS_DEACTIVATED) { | |
1583 | ffs->state = FFS_CLOSING; | |
1584 | ffs_data_reset(ffs); | |
1585 | } | |
ddf8abd2 MN |
1586 | } |
1587 | ||
1588 | static void ffs_data_put(struct ffs_data *ffs) | |
1589 | { | |
1590 | ENTER(); | |
1591 | ||
1592 | if (unlikely(atomic_dec_and_test(&ffs->ref))) { | |
aa02f172 | 1593 | pr_info("%s(): freeing\n", __func__); |
ddf8abd2 | 1594 | ffs_data_clear(ffs); |
647d5580 | 1595 | BUG_ON(waitqueue_active(&ffs->ev.waitq) || |
ddf8abd2 | 1596 | waitqueue_active(&ffs->ep0req_completion.wait)); |
581791f5 | 1597 | kfree(ffs->dev_name); |
ddf8abd2 MN |
1598 | kfree(ffs); |
1599 | } | |
1600 | } | |
1601 | ||
ddf8abd2 MN |
1602 | static void ffs_data_closed(struct ffs_data *ffs) |
1603 | { | |
1604 | ENTER(); | |
1605 | ||
1606 | if (atomic_dec_and_test(&ffs->opened)) { | |
18d6b32f RB |
1607 | if (ffs->no_disconnect) { |
1608 | ffs->state = FFS_DEACTIVATED; | |
1609 | if (ffs->epfiles) { | |
1610 | ffs_epfiles_destroy(ffs->epfiles, | |
1611 | ffs->eps_count); | |
1612 | ffs->epfiles = NULL; | |
1613 | } | |
1614 | if (ffs->setup_state == FFS_SETUP_PENDING) | |
1615 | __ffs_ep0_stall(ffs); | |
1616 | } else { | |
1617 | ffs->state = FFS_CLOSING; | |
1618 | ffs_data_reset(ffs); | |
1619 | } | |
1620 | } | |
1621 | if (atomic_read(&ffs->opened) < 0) { | |
ddf8abd2 MN |
1622 | ffs->state = FFS_CLOSING; |
1623 | ffs_data_reset(ffs); | |
1624 | } | |
1625 | ||
1626 | ffs_data_put(ffs); | |
1627 | } | |
1628 | ||
ddf8abd2 MN |
1629 | static struct ffs_data *ffs_data_new(void) |
1630 | { | |
1631 | struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); | |
1632 | if (unlikely(!ffs)) | |
f8800d47 | 1633 | return NULL; |
ddf8abd2 MN |
1634 | |
1635 | ENTER(); | |
1636 | ||
1637 | atomic_set(&ffs->ref, 1); | |
1638 | atomic_set(&ffs->opened, 0); | |
1639 | ffs->state = FFS_READ_DESCRIPTORS; | |
1640 | mutex_init(&ffs->mutex); | |
1641 | spin_lock_init(&ffs->eps_lock); | |
1642 | init_waitqueue_head(&ffs->ev.waitq); | |
1643 | init_completion(&ffs->ep0req_completion); | |
1644 | ||
1645 | /* XXX REVISIT need to update it in some places, or do we? */ | |
1646 | ffs->ev.can_stall = 1; | |
1647 | ||
1648 | return ffs; | |
1649 | } | |
1650 | ||
ddf8abd2 MN |
1651 | static void ffs_data_clear(struct ffs_data *ffs) |
1652 | { | |
1653 | ENTER(); | |
1654 | ||
49a79d8b | 1655 | ffs_closed(ffs); |
ddf8abd2 MN |
1656 | |
1657 | BUG_ON(ffs->gadget); | |
1658 | ||
1659 | if (ffs->epfiles) | |
1660 | ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); | |
1661 | ||
5e33f6fd RB |
1662 | if (ffs->ffs_eventfd) |
1663 | eventfd_ctx_put(ffs->ffs_eventfd); | |
1664 | ||
ac8dde11 | 1665 | kfree(ffs->raw_descs_data); |
ddf8abd2 MN |
1666 | kfree(ffs->raw_strings); |
1667 | kfree(ffs->stringtabs); | |
1668 | } | |
1669 | ||
ddf8abd2 MN |
1670 | static void ffs_data_reset(struct ffs_data *ffs) |
1671 | { | |
1672 | ENTER(); | |
1673 | ||
1674 | ffs_data_clear(ffs); | |
1675 | ||
1676 | ffs->epfiles = NULL; | |
ac8dde11 | 1677 | ffs->raw_descs_data = NULL; |
ddf8abd2 MN |
1678 | ffs->raw_descs = NULL; |
1679 | ffs->raw_strings = NULL; | |
1680 | ffs->stringtabs = NULL; | |
1681 | ||
1682 | ffs->raw_descs_length = 0; | |
ddf8abd2 MN |
1683 | ffs->fs_descs_count = 0; |
1684 | ffs->hs_descs_count = 0; | |
8d4e897b | 1685 | ffs->ss_descs_count = 0; |
ddf8abd2 MN |
1686 | |
1687 | ffs->strings_count = 0; | |
1688 | ffs->interfaces_count = 0; | |
1689 | ffs->eps_count = 0; | |
1690 | ||
1691 | ffs->ev.count = 0; | |
1692 | ||
1693 | ffs->state = FFS_READ_DESCRIPTORS; | |
1694 | ffs->setup_state = FFS_NO_SETUP; | |
1695 | ffs->flags = 0; | |
1696 | } | |
1697 | ||
1698 | ||
1699 | static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) | |
1700 | { | |
fd7c9a00 MN |
1701 | struct usb_gadget_strings **lang; |
1702 | int first_id; | |
ddf8abd2 MN |
1703 | |
1704 | ENTER(); | |
1705 | ||
1706 | if (WARN_ON(ffs->state != FFS_ACTIVE | |
1707 | || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) | |
1708 | return -EBADFD; | |
1709 | ||
fd7c9a00 MN |
1710 | first_id = usb_string_ids_n(cdev, ffs->strings_count); |
1711 | if (unlikely(first_id < 0)) | |
1712 | return first_id; | |
ddf8abd2 MN |
1713 | |
1714 | ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); | |
1715 | if (unlikely(!ffs->ep0req)) | |
1716 | return -ENOMEM; | |
1717 | ffs->ep0req->complete = ffs_ep0_complete; | |
1718 | ffs->ep0req->context = ffs; | |
1719 | ||
fd7c9a00 | 1720 | lang = ffs->stringtabs; |
f0688c8b MN |
1721 | if (lang) { |
1722 | for (; *lang; ++lang) { | |
1723 | struct usb_string *str = (*lang)->strings; | |
1724 | int id = first_id; | |
1725 | for (; str->s; ++id, ++str) | |
1726 | str->id = id; | |
1727 | } | |
ddf8abd2 MN |
1728 | } |
1729 | ||
1730 | ffs->gadget = cdev->gadget; | |
fd7c9a00 | 1731 | ffs_data_get(ffs); |
ddf8abd2 MN |
1732 | return 0; |
1733 | } | |
1734 | ||
ddf8abd2 MN |
1735 | static void functionfs_unbind(struct ffs_data *ffs) |
1736 | { | |
1737 | ENTER(); | |
1738 | ||
1739 | if (!WARN_ON(!ffs->gadget)) { | |
1740 | usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); | |
1741 | ffs->ep0req = NULL; | |
1742 | ffs->gadget = NULL; | |
e2190a97 | 1743 | clear_bit(FFS_FL_BOUND, &ffs->flags); |
df498995 | 1744 | ffs_data_put(ffs); |
ddf8abd2 MN |
1745 | } |
1746 | } | |
1747 | ||
ddf8abd2 MN |
1748 | static int ffs_epfiles_create(struct ffs_data *ffs) |
1749 | { | |
1750 | struct ffs_epfile *epfile, *epfiles; | |
1751 | unsigned i, count; | |
1752 | ||
1753 | ENTER(); | |
1754 | ||
1755 | count = ffs->eps_count; | |
9823a525 | 1756 | epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL); |
ddf8abd2 MN |
1757 | if (!epfiles) |
1758 | return -ENOMEM; | |
1759 | ||
1760 | epfile = epfiles; | |
1761 | for (i = 1; i <= count; ++i, ++epfile) { | |
1762 | epfile->ffs = ffs; | |
1763 | mutex_init(&epfile->mutex); | |
1764 | init_waitqueue_head(&epfile->wait); | |
1b0bf88f | 1765 | if (ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) |
acba23fe | 1766 | sprintf(epfile->name, "ep%02x", ffs->eps_addrmap[i]); |
1b0bf88f | 1767 | else |
acba23fe MS |
1768 | sprintf(epfile->name, "ep%u", i); |
1769 | epfile->dentry = ffs_sb_create_file(ffs->sb, epfile->name, | |
1bb27cac AV |
1770 | epfile, |
1771 | &ffs_epfile_operations); | |
1772 | if (unlikely(!epfile->dentry)) { | |
ddf8abd2 MN |
1773 | ffs_epfiles_destroy(epfiles, i - 1); |
1774 | return -ENOMEM; | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | ffs->epfiles = epfiles; | |
1779 | return 0; | |
1780 | } | |
1781 | ||
ddf8abd2 MN |
1782 | static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) |
1783 | { | |
1784 | struct ffs_epfile *epfile = epfiles; | |
1785 | ||
1786 | ENTER(); | |
1787 | ||
1788 | for (; count; --count, ++epfile) { | |
1789 | BUG_ON(mutex_is_locked(&epfile->mutex) || | |
1790 | waitqueue_active(&epfile->wait)); | |
1791 | if (epfile->dentry) { | |
1792 | d_delete(epfile->dentry); | |
1793 | dput(epfile->dentry); | |
1794 | epfile->dentry = NULL; | |
1795 | } | |
1796 | } | |
1797 | ||
1798 | kfree(epfiles); | |
1799 | } | |
1800 | ||
ddf8abd2 MN |
1801 | static void ffs_func_eps_disable(struct ffs_function *func) |
1802 | { | |
1803 | struct ffs_ep *ep = func->eps; | |
1804 | struct ffs_epfile *epfile = func->ffs->epfiles; | |
1805 | unsigned count = func->ffs->eps_count; | |
1806 | unsigned long flags; | |
1807 | ||
a9e6f83c | 1808 | spin_lock_irqsave(&func->ffs->eps_lock, flags); |
ddf8abd2 MN |
1809 | do { |
1810 | /* pending requests get nuked */ | |
1811 | if (likely(ep->ep)) | |
1812 | usb_ep_disable(ep->ep); | |
ddf8abd2 | 1813 | ++ep; |
18d6b32f RB |
1814 | |
1815 | if (epfile) { | |
a9e6f83c MN |
1816 | epfile->ep = NULL; |
1817 | __ffs_epfile_read_buffer_free(epfile); | |
18d6b32f RB |
1818 | ++epfile; |
1819 | } | |
ddf8abd2 | 1820 | } while (--count); |
a9e6f83c | 1821 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); |
ddf8abd2 MN |
1822 | } |
1823 | ||
1824 | static int ffs_func_eps_enable(struct ffs_function *func) | |
1825 | { | |
1826 | struct ffs_data *ffs = func->ffs; | |
1827 | struct ffs_ep *ep = func->eps; | |
1828 | struct ffs_epfile *epfile = ffs->epfiles; | |
1829 | unsigned count = ffs->eps_count; | |
1830 | unsigned long flags; | |
1831 | int ret = 0; | |
1832 | ||
1833 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
1834 | do { | |
1835 | struct usb_endpoint_descriptor *ds; | |
8d4e897b MG |
1836 | int desc_idx; |
1837 | ||
1838 | if (ffs->gadget->speed == USB_SPEED_SUPER) | |
1839 | desc_idx = 2; | |
1840 | else if (ffs->gadget->speed == USB_SPEED_HIGH) | |
1841 | desc_idx = 1; | |
1842 | else | |
1843 | desc_idx = 0; | |
1844 | ||
1845 | /* fall-back to lower speed if desc missing for current speed */ | |
1846 | do { | |
1847 | ds = ep->descs[desc_idx]; | |
1848 | } while (!ds && --desc_idx >= 0); | |
1849 | ||
1850 | if (!ds) { | |
1851 | ret = -EINVAL; | |
1852 | break; | |
1853 | } | |
ddf8abd2 MN |
1854 | |
1855 | ep->ep->driver_data = ep; | |
72c973dd TB |
1856 | ep->ep->desc = ds; |
1857 | ret = usb_ep_enable(ep->ep); | |
ddf8abd2 MN |
1858 | if (likely(!ret)) { |
1859 | epfile->ep = ep; | |
1860 | epfile->in = usb_endpoint_dir_in(ds); | |
1861 | epfile->isoc = usb_endpoint_xfer_isoc(ds); | |
1862 | } else { | |
1863 | break; | |
1864 | } | |
1865 | ||
1866 | wake_up(&epfile->wait); | |
1867 | ||
1868 | ++ep; | |
1869 | ++epfile; | |
1870 | } while (--count); | |
1871 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
1872 | ||
1873 | return ret; | |
1874 | } | |
1875 | ||
1876 | ||
1877 | /* Parsing and building descriptors and strings *****************************/ | |
1878 | ||
5ab54cf7 MN |
1879 | /* |
1880 | * This validates if data pointed by data is a valid USB descriptor as | |
ddf8abd2 | 1881 | * well as record how many interfaces, endpoints and strings are |
5ab54cf7 MN |
1882 | * required by given configuration. Returns address after the |
1883 | * descriptor or NULL if data is invalid. | |
1884 | */ | |
ddf8abd2 MN |
1885 | |
1886 | enum ffs_entity_type { | |
1887 | FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT | |
1888 | }; | |
1889 | ||
f0175ab5 AP |
1890 | enum ffs_os_desc_type { |
1891 | FFS_OS_DESC, FFS_OS_DESC_EXT_COMPAT, FFS_OS_DESC_EXT_PROP | |
1892 | }; | |
1893 | ||
ddf8abd2 MN |
1894 | typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, |
1895 | u8 *valuep, | |
1896 | struct usb_descriptor_header *desc, | |
1897 | void *priv); | |
1898 | ||
f0175ab5 AP |
1899 | typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, |
1900 | struct usb_os_desc_header *h, void *data, | |
1901 | unsigned len, void *priv); | |
1902 | ||
f96cbd14 AP |
1903 | static int __must_check ffs_do_single_desc(char *data, unsigned len, |
1904 | ffs_entity_callback entity, | |
1905 | void *priv) | |
ddf8abd2 MN |
1906 | { |
1907 | struct usb_descriptor_header *_ds = (void *)data; | |
1908 | u8 length; | |
1909 | int ret; | |
1910 | ||
1911 | ENTER(); | |
1912 | ||
1913 | /* At least two bytes are required: length and type */ | |
1914 | if (len < 2) { | |
aa02f172 | 1915 | pr_vdebug("descriptor too short\n"); |
ddf8abd2 MN |
1916 | return -EINVAL; |
1917 | } | |
1918 | ||
1919 | /* If we have at least as many bytes as the descriptor takes? */ | |
1920 | length = _ds->bLength; | |
1921 | if (len < length) { | |
aa02f172 | 1922 | pr_vdebug("descriptor longer then available data\n"); |
ddf8abd2 MN |
1923 | return -EINVAL; |
1924 | } | |
1925 | ||
1926 | #define __entity_check_INTERFACE(val) 1 | |
1927 | #define __entity_check_STRING(val) (val) | |
1928 | #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) | |
1929 | #define __entity(type, val) do { \ | |
aa02f172 | 1930 | pr_vdebug("entity " #type "(%02x)\n", (val)); \ |
ddf8abd2 | 1931 | if (unlikely(!__entity_check_ ##type(val))) { \ |
aa02f172 | 1932 | pr_vdebug("invalid entity's value\n"); \ |
ddf8abd2 MN |
1933 | return -EINVAL; \ |
1934 | } \ | |
1935 | ret = entity(FFS_ ##type, &val, _ds, priv); \ | |
1936 | if (unlikely(ret < 0)) { \ | |
aa02f172 | 1937 | pr_debug("entity " #type "(%02x); ret = %d\n", \ |
d8df0b61 | 1938 | (val), ret); \ |
ddf8abd2 MN |
1939 | return ret; \ |
1940 | } \ | |
1941 | } while (0) | |
1942 | ||
1943 | /* Parse descriptor depending on type. */ | |
1944 | switch (_ds->bDescriptorType) { | |
1945 | case USB_DT_DEVICE: | |
1946 | case USB_DT_CONFIG: | |
1947 | case USB_DT_STRING: | |
1948 | case USB_DT_DEVICE_QUALIFIER: | |
1949 | /* function can't have any of those */ | |
aa02f172 | 1950 | pr_vdebug("descriptor reserved for gadget: %d\n", |
5ab54cf7 | 1951 | _ds->bDescriptorType); |
ddf8abd2 MN |
1952 | return -EINVAL; |
1953 | ||
1954 | case USB_DT_INTERFACE: { | |
1955 | struct usb_interface_descriptor *ds = (void *)_ds; | |
aa02f172 | 1956 | pr_vdebug("interface descriptor\n"); |
ddf8abd2 MN |
1957 | if (length != sizeof *ds) |
1958 | goto inv_length; | |
1959 | ||
1960 | __entity(INTERFACE, ds->bInterfaceNumber); | |
1961 | if (ds->iInterface) | |
1962 | __entity(STRING, ds->iInterface); | |
1963 | } | |
1964 | break; | |
1965 | ||
1966 | case USB_DT_ENDPOINT: { | |
1967 | struct usb_endpoint_descriptor *ds = (void *)_ds; | |
aa02f172 | 1968 | pr_vdebug("endpoint descriptor\n"); |
ddf8abd2 MN |
1969 | if (length != USB_DT_ENDPOINT_SIZE && |
1970 | length != USB_DT_ENDPOINT_AUDIO_SIZE) | |
1971 | goto inv_length; | |
1972 | __entity(ENDPOINT, ds->bEndpointAddress); | |
1973 | } | |
1974 | break; | |
1975 | ||
560f1187 KB |
1976 | case HID_DT_HID: |
1977 | pr_vdebug("hid descriptor\n"); | |
1978 | if (length != sizeof(struct hid_descriptor)) | |
1979 | goto inv_length; | |
1980 | break; | |
1981 | ||
ddf8abd2 MN |
1982 | case USB_DT_OTG: |
1983 | if (length != sizeof(struct usb_otg_descriptor)) | |
1984 | goto inv_length; | |
1985 | break; | |
1986 | ||
1987 | case USB_DT_INTERFACE_ASSOCIATION: { | |
1988 | struct usb_interface_assoc_descriptor *ds = (void *)_ds; | |
aa02f172 | 1989 | pr_vdebug("interface association descriptor\n"); |
ddf8abd2 MN |
1990 | if (length != sizeof *ds) |
1991 | goto inv_length; | |
1992 | if (ds->iFunction) | |
1993 | __entity(STRING, ds->iFunction); | |
1994 | } | |
1995 | break; | |
1996 | ||
8d4e897b MG |
1997 | case USB_DT_SS_ENDPOINT_COMP: |
1998 | pr_vdebug("EP SS companion descriptor\n"); | |
1999 | if (length != sizeof(struct usb_ss_ep_comp_descriptor)) | |
2000 | goto inv_length; | |
2001 | break; | |
2002 | ||
ddf8abd2 MN |
2003 | case USB_DT_OTHER_SPEED_CONFIG: |
2004 | case USB_DT_INTERFACE_POWER: | |
2005 | case USB_DT_DEBUG: | |
2006 | case USB_DT_SECURITY: | |
2007 | case USB_DT_CS_RADIO_CONTROL: | |
2008 | /* TODO */ | |
aa02f172 | 2009 | pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
2010 | return -EINVAL; |
2011 | ||
2012 | default: | |
2013 | /* We should never be here */ | |
aa02f172 | 2014 | pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); |
ddf8abd2 MN |
2015 | return -EINVAL; |
2016 | ||
5ab54cf7 | 2017 | inv_length: |
aa02f172 | 2018 | pr_vdebug("invalid length: %d (descriptor %d)\n", |
d8df0b61 | 2019 | _ds->bLength, _ds->bDescriptorType); |
ddf8abd2 MN |
2020 | return -EINVAL; |
2021 | } | |
2022 | ||
2023 | #undef __entity | |
2024 | #undef __entity_check_DESCRIPTOR | |
2025 | #undef __entity_check_INTERFACE | |
2026 | #undef __entity_check_STRING | |
2027 | #undef __entity_check_ENDPOINT | |
2028 | ||
2029 | return length; | |
2030 | } | |
2031 | ||
ddf8abd2 MN |
2032 | static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, |
2033 | ffs_entity_callback entity, void *priv) | |
2034 | { | |
2035 | const unsigned _len = len; | |
2036 | unsigned long num = 0; | |
2037 | ||
2038 | ENTER(); | |
2039 | ||
2040 | for (;;) { | |
2041 | int ret; | |
2042 | ||
2043 | if (num == count) | |
2044 | data = NULL; | |
2045 | ||
5ab54cf7 | 2046 | /* Record "descriptor" entity */ |
ddf8abd2 MN |
2047 | ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); |
2048 | if (unlikely(ret < 0)) { | |
aa02f172 | 2049 | pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", |
d8df0b61 | 2050 | num, ret); |
ddf8abd2 MN |
2051 | return ret; |
2052 | } | |
2053 | ||
2054 | if (!data) | |
2055 | return _len - len; | |
2056 | ||
f96cbd14 | 2057 | ret = ffs_do_single_desc(data, len, entity, priv); |
ddf8abd2 | 2058 | if (unlikely(ret < 0)) { |
aa02f172 | 2059 | pr_debug("%s returns %d\n", __func__, ret); |
ddf8abd2 MN |
2060 | return ret; |
2061 | } | |
2062 | ||
2063 | len -= ret; | |
2064 | data += ret; | |
2065 | ++num; | |
2066 | } | |
2067 | } | |
2068 | ||
ddf8abd2 MN |
2069 | static int __ffs_data_do_entity(enum ffs_entity_type type, |
2070 | u8 *valuep, struct usb_descriptor_header *desc, | |
2071 | void *priv) | |
2072 | { | |
6d5c1c77 RB |
2073 | struct ffs_desc_helper *helper = priv; |
2074 | struct usb_endpoint_descriptor *d; | |
ddf8abd2 MN |
2075 | |
2076 | ENTER(); | |
2077 | ||
2078 | switch (type) { | |
2079 | case FFS_DESCRIPTOR: | |
2080 | break; | |
2081 | ||
2082 | case FFS_INTERFACE: | |
5ab54cf7 MN |
2083 | /* |
2084 | * Interfaces are indexed from zero so if we | |
ddf8abd2 | 2085 | * encountered interface "n" then there are at least |
5ab54cf7 MN |
2086 | * "n+1" interfaces. |
2087 | */ | |
6d5c1c77 RB |
2088 | if (*valuep >= helper->interfaces_count) |
2089 | helper->interfaces_count = *valuep + 1; | |
ddf8abd2 MN |
2090 | break; |
2091 | ||
2092 | case FFS_STRING: | |
5ab54cf7 | 2093 | /* |
96a420d2 VP |
2094 | * Strings are indexed from 1 (0 is reserved |
2095 | * for languages list) | |
5ab54cf7 | 2096 | */ |
6d5c1c77 RB |
2097 | if (*valuep > helper->ffs->strings_count) |
2098 | helper->ffs->strings_count = *valuep; | |
ddf8abd2 MN |
2099 | break; |
2100 | ||
2101 | case FFS_ENDPOINT: | |
6d5c1c77 RB |
2102 | d = (void *)desc; |
2103 | helper->eps_count++; | |
2104 | if (helper->eps_count >= 15) | |
2105 | return -EINVAL; | |
2106 | /* Check if descriptors for any speed were already parsed */ | |
2107 | if (!helper->ffs->eps_count && !helper->ffs->interfaces_count) | |
2108 | helper->ffs->eps_addrmap[helper->eps_count] = | |
2109 | d->bEndpointAddress; | |
2110 | else if (helper->ffs->eps_addrmap[helper->eps_count] != | |
2111 | d->bEndpointAddress) | |
2112 | return -EINVAL; | |
ddf8abd2 MN |
2113 | break; |
2114 | } | |
2115 | ||
2116 | return 0; | |
2117 | } | |
2118 | ||
f0175ab5 AP |
2119 | static int __ffs_do_os_desc_header(enum ffs_os_desc_type *next_type, |
2120 | struct usb_os_desc_header *desc) | |
2121 | { | |
2122 | u16 bcd_version = le16_to_cpu(desc->bcdVersion); | |
2123 | u16 w_index = le16_to_cpu(desc->wIndex); | |
2124 | ||
2125 | if (bcd_version != 1) { | |
2126 | pr_vdebug("unsupported os descriptors version: %d", | |
2127 | bcd_version); | |
2128 | return -EINVAL; | |
2129 | } | |
2130 | switch (w_index) { | |
2131 | case 0x4: | |
2132 | *next_type = FFS_OS_DESC_EXT_COMPAT; | |
2133 | break; | |
2134 | case 0x5: | |
2135 | *next_type = FFS_OS_DESC_EXT_PROP; | |
2136 | break; | |
2137 | default: | |
2138 | pr_vdebug("unsupported os descriptor type: %d", w_index); | |
2139 | return -EINVAL; | |
2140 | } | |
2141 | ||
2142 | return sizeof(*desc); | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * Process all extended compatibility/extended property descriptors | |
2147 | * of a feature descriptor | |
2148 | */ | |
2149 | static int __must_check ffs_do_single_os_desc(char *data, unsigned len, | |
2150 | enum ffs_os_desc_type type, | |
2151 | u16 feature_count, | |
2152 | ffs_os_desc_callback entity, | |
2153 | void *priv, | |
2154 | struct usb_os_desc_header *h) | |
2155 | { | |
2156 | int ret; | |
2157 | const unsigned _len = len; | |
2158 | ||
2159 | ENTER(); | |
2160 | ||
2161 | /* loop over all ext compat/ext prop descriptors */ | |
2162 | while (feature_count--) { | |
2163 | ret = entity(type, h, data, len, priv); | |
2164 | if (unlikely(ret < 0)) { | |
2165 | pr_debug("bad OS descriptor, type: %d\n", type); | |
2166 | return ret; | |
2167 | } | |
2168 | data += ret; | |
2169 | len -= ret; | |
2170 | } | |
2171 | return _len - len; | |
2172 | } | |
2173 | ||
2174 | /* Process a number of complete Feature Descriptors (Ext Compat or Ext Prop) */ | |
2175 | static int __must_check ffs_do_os_descs(unsigned count, | |
2176 | char *data, unsigned len, | |
2177 | ffs_os_desc_callback entity, void *priv) | |
2178 | { | |
2179 | const unsigned _len = len; | |
2180 | unsigned long num = 0; | |
2181 | ||
2182 | ENTER(); | |
2183 | ||
2184 | for (num = 0; num < count; ++num) { | |
2185 | int ret; | |
2186 | enum ffs_os_desc_type type; | |
2187 | u16 feature_count; | |
2188 | struct usb_os_desc_header *desc = (void *)data; | |
2189 | ||
2190 | if (len < sizeof(*desc)) | |
2191 | return -EINVAL; | |
2192 | ||
2193 | /* | |
2194 | * Record "descriptor" entity. | |
2195 | * Process dwLength, bcdVersion, wIndex, get b/wCount. | |
2196 | * Move the data pointer to the beginning of extended | |
2197 | * compatibilities proper or extended properties proper | |
2198 | * portions of the data | |
2199 | */ | |
2200 | if (le32_to_cpu(desc->dwLength) > len) | |
2201 | return -EINVAL; | |
2202 | ||
2203 | ret = __ffs_do_os_desc_header(&type, desc); | |
2204 | if (unlikely(ret < 0)) { | |
2205 | pr_debug("entity OS_DESCRIPTOR(%02lx); ret = %d\n", | |
2206 | num, ret); | |
2207 | return ret; | |
2208 | } | |
2209 | /* | |
2210 | * 16-bit hex "?? 00" Little Endian looks like 8-bit hex "??" | |
2211 | */ | |
2212 | feature_count = le16_to_cpu(desc->wCount); | |
2213 | if (type == FFS_OS_DESC_EXT_COMPAT && | |
2214 | (feature_count > 255 || desc->Reserved)) | |
2215 | return -EINVAL; | |
2216 | len -= ret; | |
2217 | data += ret; | |
2218 | ||
2219 | /* | |
2220 | * Process all function/property descriptors | |
2221 | * of this Feature Descriptor | |
2222 | */ | |
2223 | ret = ffs_do_single_os_desc(data, len, type, | |
2224 | feature_count, entity, priv, desc); | |
2225 | if (unlikely(ret < 0)) { | |
2226 | pr_debug("%s returns %d\n", __func__, ret); | |
2227 | return ret; | |
2228 | } | |
2229 | ||
2230 | len -= ret; | |
2231 | data += ret; | |
2232 | } | |
2233 | return _len - len; | |
2234 | } | |
2235 | ||
2236 | /** | |
2237 | * Validate contents of the buffer from userspace related to OS descriptors. | |
2238 | */ | |
2239 | static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, | |
2240 | struct usb_os_desc_header *h, void *data, | |
2241 | unsigned len, void *priv) | |
2242 | { | |
2243 | struct ffs_data *ffs = priv; | |
2244 | u8 length; | |
2245 | ||
2246 | ENTER(); | |
2247 | ||
2248 | switch (type) { | |
2249 | case FFS_OS_DESC_EXT_COMPAT: { | |
2250 | struct usb_ext_compat_desc *d = data; | |
2251 | int i; | |
2252 | ||
2253 | if (len < sizeof(*d) || | |
2254 | d->bFirstInterfaceNumber >= ffs->interfaces_count || | |
354bc45b | 2255 | d->Reserved1) |
f0175ab5 AP |
2256 | return -EINVAL; |
2257 | for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) | |
2258 | if (d->Reserved2[i]) | |
2259 | return -EINVAL; | |
2260 | ||
2261 | length = sizeof(struct usb_ext_compat_desc); | |
2262 | } | |
2263 | break; | |
2264 | case FFS_OS_DESC_EXT_PROP: { | |
2265 | struct usb_ext_prop_desc *d = data; | |
2266 | u32 type, pdl; | |
2267 | u16 pnl; | |
2268 | ||
2269 | if (len < sizeof(*d) || h->interface >= ffs->interfaces_count) | |
2270 | return -EINVAL; | |
2271 | length = le32_to_cpu(d->dwSize); | |
2272 | type = le32_to_cpu(d->dwPropertyDataType); | |
2273 | if (type < USB_EXT_PROP_UNICODE || | |
2274 | type > USB_EXT_PROP_UNICODE_MULTI) { | |
2275 | pr_vdebug("unsupported os descriptor property type: %d", | |
2276 | type); | |
2277 | return -EINVAL; | |
2278 | } | |
2279 | pnl = le16_to_cpu(d->wPropertyNameLength); | |
2280 | pdl = le32_to_cpu(*(u32 *)((u8 *)data + 10 + pnl)); | |
2281 | if (length != 14 + pnl + pdl) { | |
2282 | pr_vdebug("invalid os descriptor length: %d pnl:%d pdl:%d (descriptor %d)\n", | |
2283 | length, pnl, pdl, type); | |
2284 | return -EINVAL; | |
2285 | } | |
2286 | ++ffs->ms_os_descs_ext_prop_count; | |
2287 | /* property name reported to the host as "WCHAR"s */ | |
2288 | ffs->ms_os_descs_ext_prop_name_len += pnl * 2; | |
2289 | ffs->ms_os_descs_ext_prop_data_len += pdl; | |
2290 | } | |
2291 | break; | |
2292 | default: | |
2293 | pr_vdebug("unknown descriptor: %d\n", type); | |
2294 | return -EINVAL; | |
2295 | } | |
2296 | return length; | |
2297 | } | |
2298 | ||
ddf8abd2 MN |
2299 | static int __ffs_data_got_descs(struct ffs_data *ffs, |
2300 | char *const _data, size_t len) | |
2301 | { | |
ac8dde11 | 2302 | char *data = _data, *raw_descs; |
f0175ab5 | 2303 | unsigned os_descs_count = 0, counts[3], flags; |
ac8dde11 | 2304 | int ret = -EINVAL, i; |
6d5c1c77 | 2305 | struct ffs_desc_helper helper; |
ddf8abd2 MN |
2306 | |
2307 | ENTER(); | |
2308 | ||
ac8dde11 | 2309 | if (get_unaligned_le32(data + 4) != len) |
ddf8abd2 | 2310 | goto error; |
ddf8abd2 | 2311 | |
ac8dde11 MN |
2312 | switch (get_unaligned_le32(data)) { |
2313 | case FUNCTIONFS_DESCRIPTORS_MAGIC: | |
2314 | flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; | |
2315 | data += 8; | |
2316 | len -= 8; | |
2317 | break; | |
2318 | case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: | |
2319 | flags = get_unaligned_le32(data + 8); | |
1b0bf88f | 2320 | ffs->user_flags = flags; |
ac8dde11 MN |
2321 | if (flags & ~(FUNCTIONFS_HAS_FS_DESC | |
2322 | FUNCTIONFS_HAS_HS_DESC | | |
f0175ab5 | 2323 | FUNCTIONFS_HAS_SS_DESC | |
1b0bf88f | 2324 | FUNCTIONFS_HAS_MS_OS_DESC | |
5e33f6fd | 2325 | FUNCTIONFS_VIRTUAL_ADDR | |
54dfce6d | 2326 | FUNCTIONFS_EVENTFD | |
4368c28a FH |
2327 | FUNCTIONFS_ALL_CTRL_RECIP | |
2328 | FUNCTIONFS_CONFIG0_SETUP)) { | |
ac8dde11 | 2329 | ret = -ENOSYS; |
ddf8abd2 MN |
2330 | goto error; |
2331 | } | |
ac8dde11 MN |
2332 | data += 12; |
2333 | len -= 12; | |
2334 | break; | |
2335 | default: | |
2336 | goto error; | |
ddf8abd2 | 2337 | } |
ddf8abd2 | 2338 | |
5e33f6fd RB |
2339 | if (flags & FUNCTIONFS_EVENTFD) { |
2340 | if (len < 4) | |
2341 | goto error; | |
2342 | ffs->ffs_eventfd = | |
2343 | eventfd_ctx_fdget((int)get_unaligned_le32(data)); | |
2344 | if (IS_ERR(ffs->ffs_eventfd)) { | |
2345 | ret = PTR_ERR(ffs->ffs_eventfd); | |
2346 | ffs->ffs_eventfd = NULL; | |
2347 | goto error; | |
2348 | } | |
2349 | data += 4; | |
2350 | len -= 4; | |
2351 | } | |
2352 | ||
ac8dde11 MN |
2353 | /* Read fs_count, hs_count and ss_count (if present) */ |
2354 | for (i = 0; i < 3; ++i) { | |
2355 | if (!(flags & (1 << i))) { | |
2356 | counts[i] = 0; | |
2357 | } else if (len < 4) { | |
8d4e897b | 2358 | goto error; |
ac8dde11 MN |
2359 | } else { |
2360 | counts[i] = get_unaligned_le32(data); | |
2361 | data += 4; | |
2362 | len -= 4; | |
8d4e897b | 2363 | } |
ddf8abd2 | 2364 | } |
f0175ab5 AP |
2365 | if (flags & (1 << i)) { |
2366 | os_descs_count = get_unaligned_le32(data); | |
2367 | data += 4; | |
2368 | len -= 4; | |
2369 | }; | |
ddf8abd2 | 2370 | |
ac8dde11 MN |
2371 | /* Read descriptors */ |
2372 | raw_descs = data; | |
6d5c1c77 | 2373 | helper.ffs = ffs; |
ac8dde11 MN |
2374 | for (i = 0; i < 3; ++i) { |
2375 | if (!counts[i]) | |
2376 | continue; | |
6d5c1c77 RB |
2377 | helper.interfaces_count = 0; |
2378 | helper.eps_count = 0; | |
ac8dde11 | 2379 | ret = ffs_do_descs(counts[i], data, len, |
6d5c1c77 | 2380 | __ffs_data_do_entity, &helper); |
ac8dde11 | 2381 | if (ret < 0) |
ddf8abd2 | 2382 | goto error; |
6d5c1c77 RB |
2383 | if (!ffs->eps_count && !ffs->interfaces_count) { |
2384 | ffs->eps_count = helper.eps_count; | |
2385 | ffs->interfaces_count = helper.interfaces_count; | |
2386 | } else { | |
2387 | if (ffs->eps_count != helper.eps_count) { | |
2388 | ret = -EINVAL; | |
2389 | goto error; | |
2390 | } | |
2391 | if (ffs->interfaces_count != helper.interfaces_count) { | |
2392 | ret = -EINVAL; | |
2393 | goto error; | |
2394 | } | |
2395 | } | |
ac8dde11 MN |
2396 | data += ret; |
2397 | len -= ret; | |
ddf8abd2 | 2398 | } |
f0175ab5 AP |
2399 | if (os_descs_count) { |
2400 | ret = ffs_do_os_descs(os_descs_count, data, len, | |
2401 | __ffs_data_do_os_desc, ffs); | |
2402 | if (ret < 0) | |
2403 | goto error; | |
2404 | data += ret; | |
2405 | len -= ret; | |
2406 | } | |
ddf8abd2 | 2407 | |
ac8dde11 MN |
2408 | if (raw_descs == data || len) { |
2409 | ret = -EINVAL; | |
2410 | goto error; | |
2411 | } | |
ddf8abd2 | 2412 | |
ac8dde11 MN |
2413 | ffs->raw_descs_data = _data; |
2414 | ffs->raw_descs = raw_descs; | |
2415 | ffs->raw_descs_length = data - raw_descs; | |
2416 | ffs->fs_descs_count = counts[0]; | |
2417 | ffs->hs_descs_count = counts[1]; | |
2418 | ffs->ss_descs_count = counts[2]; | |
f0175ab5 | 2419 | ffs->ms_os_descs_count = os_descs_count; |
ddf8abd2 MN |
2420 | |
2421 | return 0; | |
2422 | ||
ddf8abd2 MN |
2423 | error: |
2424 | kfree(_data); | |
2425 | return ret; | |
2426 | } | |
2427 | ||
ddf8abd2 MN |
2428 | static int __ffs_data_got_strings(struct ffs_data *ffs, |
2429 | char *const _data, size_t len) | |
2430 | { | |
2431 | u32 str_count, needed_count, lang_count; | |
2432 | struct usb_gadget_strings **stringtabs, *t; | |
ddf8abd2 | 2433 | const char *data = _data; |
872ce511 | 2434 | struct usb_string *s; |
ddf8abd2 MN |
2435 | |
2436 | ENTER(); | |
2437 | ||
2438 | if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || | |
2439 | get_unaligned_le32(data + 4) != len)) | |
2440 | goto error; | |
2441 | str_count = get_unaligned_le32(data + 8); | |
2442 | lang_count = get_unaligned_le32(data + 12); | |
2443 | ||
2444 | /* if one is zero the other must be zero */ | |
2445 | if (unlikely(!str_count != !lang_count)) | |
2446 | goto error; | |
2447 | ||
2448 | /* Do we have at least as many strings as descriptors need? */ | |
2449 | needed_count = ffs->strings_count; | |
2450 | if (unlikely(str_count < needed_count)) | |
2451 | goto error; | |
2452 | ||
5ab54cf7 MN |
2453 | /* |
2454 | * If we don't need any strings just return and free all | |
2455 | * memory. | |
2456 | */ | |
ddf8abd2 MN |
2457 | if (!needed_count) { |
2458 | kfree(_data); | |
2459 | return 0; | |
2460 | } | |
2461 | ||
5ab54cf7 | 2462 | /* Allocate everything in one chunk so there's less maintenance. */ |
ddf8abd2 | 2463 | { |
ddf8abd2 | 2464 | unsigned i = 0; |
e6f3862f AP |
2465 | vla_group(d); |
2466 | vla_item(d, struct usb_gadget_strings *, stringtabs, | |
2467 | lang_count + 1); | |
2468 | vla_item(d, struct usb_gadget_strings, stringtab, lang_count); | |
2469 | vla_item(d, struct usb_string, strings, | |
2470 | lang_count*(needed_count+1)); | |
ddf8abd2 | 2471 | |
e6f3862f AP |
2472 | char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); |
2473 | ||
2474 | if (unlikely(!vlabuf)) { | |
ddf8abd2 MN |
2475 | kfree(_data); |
2476 | return -ENOMEM; | |
2477 | } | |
2478 | ||
e6f3862f AP |
2479 | /* Initialize the VLA pointers */ |
2480 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2481 | t = vla_ptr(vlabuf, d, stringtab); | |
ddf8abd2 MN |
2482 | i = lang_count; |
2483 | do { | |
2484 | *stringtabs++ = t++; | |
2485 | } while (--i); | |
2486 | *stringtabs = NULL; | |
2487 | ||
e6f3862f AP |
2488 | /* stringtabs = vlabuf = d_stringtabs for later kfree */ |
2489 | stringtabs = vla_ptr(vlabuf, d, stringtabs); | |
2490 | t = vla_ptr(vlabuf, d, stringtab); | |
2491 | s = vla_ptr(vlabuf, d, strings); | |
ddf8abd2 MN |
2492 | } |
2493 | ||
2494 | /* For each language */ | |
2495 | data += 16; | |
2496 | len -= 16; | |
2497 | ||
2498 | do { /* lang_count > 0 so we can use do-while */ | |
2499 | unsigned needed = needed_count; | |
2500 | ||
2501 | if (unlikely(len < 3)) | |
2502 | goto error_free; | |
2503 | t->language = get_unaligned_le16(data); | |
2504 | t->strings = s; | |
2505 | ++t; | |
2506 | ||
2507 | data += 2; | |
2508 | len -= 2; | |
2509 | ||
2510 | /* For each string */ | |
2511 | do { /* str_count > 0 so we can use do-while */ | |
2512 | size_t length = strnlen(data, len); | |
2513 | ||
2514 | if (unlikely(length == len)) | |
2515 | goto error_free; | |
2516 | ||
5ab54cf7 MN |
2517 | /* |
2518 | * User may provide more strings then we need, | |
2519 | * if that's the case we simply ignore the | |
2520 | * rest | |
2521 | */ | |
ddf8abd2 | 2522 | if (likely(needed)) { |
5ab54cf7 MN |
2523 | /* |
2524 | * s->id will be set while adding | |
ddf8abd2 | 2525 | * function to configuration so for |
5ab54cf7 MN |
2526 | * now just leave garbage here. |
2527 | */ | |
ddf8abd2 MN |
2528 | s->s = data; |
2529 | --needed; | |
2530 | ++s; | |
2531 | } | |
2532 | ||
2533 | data += length + 1; | |
2534 | len -= length + 1; | |
2535 | } while (--str_count); | |
2536 | ||
2537 | s->id = 0; /* terminator */ | |
2538 | s->s = NULL; | |
2539 | ++s; | |
2540 | ||
2541 | } while (--lang_count); | |
2542 | ||
2543 | /* Some garbage left? */ | |
2544 | if (unlikely(len)) | |
2545 | goto error_free; | |
2546 | ||
2547 | /* Done! */ | |
2548 | ffs->stringtabs = stringtabs; | |
2549 | ffs->raw_strings = _data; | |
2550 | ||
2551 | return 0; | |
2552 | ||
2553 | error_free: | |
2554 | kfree(stringtabs); | |
2555 | error: | |
2556 | kfree(_data); | |
2557 | return -EINVAL; | |
2558 | } | |
2559 | ||
2560 | ||
ddf8abd2 MN |
2561 | /* Events handling and management *******************************************/ |
2562 | ||
2563 | static void __ffs_event_add(struct ffs_data *ffs, | |
2564 | enum usb_functionfs_event_type type) | |
2565 | { | |
2566 | enum usb_functionfs_event_type rem_type1, rem_type2 = type; | |
2567 | int neg = 0; | |
2568 | ||
5ab54cf7 MN |
2569 | /* |
2570 | * Abort any unhandled setup | |
2571 | * | |
2572 | * We do not need to worry about some cmpxchg() changing value | |
ddf8abd2 MN |
2573 | * of ffs->setup_state without holding the lock because when |
2574 | * state is FFS_SETUP_PENDING cmpxchg() in several places in | |
5ab54cf7 MN |
2575 | * the source does nothing. |
2576 | */ | |
ddf8abd2 | 2577 | if (ffs->setup_state == FFS_SETUP_PENDING) |
e46318a0 | 2578 | ffs->setup_state = FFS_SETUP_CANCELLED; |
ddf8abd2 | 2579 | |
67913bbd MN |
2580 | /* |
2581 | * Logic of this function guarantees that there are at most four pending | |
2582 | * evens on ffs->ev.types queue. This is important because the queue | |
2583 | * has space for four elements only and __ffs_ep0_read_events function | |
2584 | * depends on that limit as well. If more event types are added, those | |
2585 | * limits have to be revisited or guaranteed to still hold. | |
2586 | */ | |
ddf8abd2 MN |
2587 | switch (type) { |
2588 | case FUNCTIONFS_RESUME: | |
2589 | rem_type2 = FUNCTIONFS_SUSPEND; | |
5ab54cf7 | 2590 | /* FALL THROUGH */ |
ddf8abd2 MN |
2591 | case FUNCTIONFS_SUSPEND: |
2592 | case FUNCTIONFS_SETUP: | |
2593 | rem_type1 = type; | |
5ab54cf7 | 2594 | /* Discard all similar events */ |
ddf8abd2 MN |
2595 | break; |
2596 | ||
2597 | case FUNCTIONFS_BIND: | |
2598 | case FUNCTIONFS_UNBIND: | |
2599 | case FUNCTIONFS_DISABLE: | |
2600 | case FUNCTIONFS_ENABLE: | |
5ab54cf7 | 2601 | /* Discard everything other then power management. */ |
ddf8abd2 MN |
2602 | rem_type1 = FUNCTIONFS_SUSPEND; |
2603 | rem_type2 = FUNCTIONFS_RESUME; | |
2604 | neg = 1; | |
2605 | break; | |
2606 | ||
2607 | default: | |
fe00bcbf MN |
2608 | WARN(1, "%d: unknown event, this should not happen\n", type); |
2609 | return; | |
ddf8abd2 MN |
2610 | } |
2611 | ||
2612 | { | |
2613 | u8 *ev = ffs->ev.types, *out = ev; | |
2614 | unsigned n = ffs->ev.count; | |
2615 | for (; n; --n, ++ev) | |
2616 | if ((*ev == rem_type1 || *ev == rem_type2) == neg) | |
2617 | *out++ = *ev; | |
2618 | else | |
aa02f172 | 2619 | pr_vdebug("purging event %d\n", *ev); |
ddf8abd2 MN |
2620 | ffs->ev.count = out - ffs->ev.types; |
2621 | } | |
2622 | ||
aa02f172 | 2623 | pr_vdebug("adding event %d\n", type); |
ddf8abd2 MN |
2624 | ffs->ev.types[ffs->ev.count++] = type; |
2625 | wake_up_locked(&ffs->ev.waitq); | |
5e33f6fd RB |
2626 | if (ffs->ffs_eventfd) |
2627 | eventfd_signal(ffs->ffs_eventfd, 1); | |
ddf8abd2 MN |
2628 | } |
2629 | ||
2630 | static void ffs_event_add(struct ffs_data *ffs, | |
2631 | enum usb_functionfs_event_type type) | |
2632 | { | |
2633 | unsigned long flags; | |
2634 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
2635 | __ffs_event_add(ffs, type); | |
2636 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
2637 | } | |
2638 | ||
ddf8abd2 MN |
2639 | /* Bind/unbind USB function hooks *******************************************/ |
2640 | ||
6d5c1c77 RB |
2641 | static int ffs_ep_addr2idx(struct ffs_data *ffs, u8 endpoint_address) |
2642 | { | |
2643 | int i; | |
2644 | ||
2645 | for (i = 1; i < ARRAY_SIZE(ffs->eps_addrmap); ++i) | |
2646 | if (ffs->eps_addrmap[i] == endpoint_address) | |
2647 | return i; | |
2648 | return -ENOENT; | |
2649 | } | |
2650 | ||
ddf8abd2 MN |
2651 | static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, |
2652 | struct usb_descriptor_header *desc, | |
2653 | void *priv) | |
2654 | { | |
2655 | struct usb_endpoint_descriptor *ds = (void *)desc; | |
2656 | struct ffs_function *func = priv; | |
2657 | struct ffs_ep *ffs_ep; | |
85b06f5e DC |
2658 | unsigned ep_desc_id; |
2659 | int idx; | |
8d4e897b | 2660 | static const char *speed_names[] = { "full", "high", "super" }; |
ddf8abd2 MN |
2661 | |
2662 | if (type != FFS_DESCRIPTOR) | |
2663 | return 0; | |
2664 | ||
8d4e897b MG |
2665 | /* |
2666 | * If ss_descriptors is not NULL, we are reading super speed | |
2667 | * descriptors; if hs_descriptors is not NULL, we are reading high | |
2668 | * speed descriptors; otherwise, we are reading full speed | |
2669 | * descriptors. | |
2670 | */ | |
2671 | if (func->function.ss_descriptors) { | |
2672 | ep_desc_id = 2; | |
2673 | func->function.ss_descriptors[(long)valuep] = desc; | |
2674 | } else if (func->function.hs_descriptors) { | |
2675 | ep_desc_id = 1; | |
ddf8abd2 | 2676 | func->function.hs_descriptors[(long)valuep] = desc; |
8d4e897b MG |
2677 | } else { |
2678 | ep_desc_id = 0; | |
10287bae | 2679 | func->function.fs_descriptors[(long)valuep] = desc; |
8d4e897b | 2680 | } |
ddf8abd2 MN |
2681 | |
2682 | if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) | |
2683 | return 0; | |
2684 | ||
6d5c1c77 RB |
2685 | idx = ffs_ep_addr2idx(func->ffs, ds->bEndpointAddress) - 1; |
2686 | if (idx < 0) | |
2687 | return idx; | |
2688 | ||
ddf8abd2 MN |
2689 | ffs_ep = func->eps + idx; |
2690 | ||
8d4e897b MG |
2691 | if (unlikely(ffs_ep->descs[ep_desc_id])) { |
2692 | pr_err("two %sspeed descriptors for EP %d\n", | |
2693 | speed_names[ep_desc_id], | |
d8df0b61 | 2694 | ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
ddf8abd2 MN |
2695 | return -EINVAL; |
2696 | } | |
8d4e897b | 2697 | ffs_ep->descs[ep_desc_id] = ds; |
ddf8abd2 MN |
2698 | |
2699 | ffs_dump_mem(": Original ep desc", ds, ds->bLength); | |
2700 | if (ffs_ep->ep) { | |
2701 | ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; | |
2702 | if (!ds->wMaxPacketSize) | |
2703 | ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; | |
2704 | } else { | |
2705 | struct usb_request *req; | |
2706 | struct usb_ep *ep; | |
1b0bf88f | 2707 | u8 bEndpointAddress; |
ddf8abd2 | 2708 | |
1b0bf88f RB |
2709 | /* |
2710 | * We back up bEndpointAddress because autoconfig overwrites | |
2711 | * it with physical endpoint address. | |
2712 | */ | |
2713 | bEndpointAddress = ds->bEndpointAddress; | |
aa02f172 | 2714 | pr_vdebug("autoconfig\n"); |
ddf8abd2 MN |
2715 | ep = usb_ep_autoconfig(func->gadget, ds); |
2716 | if (unlikely(!ep)) | |
2717 | return -ENOTSUPP; | |
cc7e6056 | 2718 | ep->driver_data = func->eps + idx; |
ddf8abd2 MN |
2719 | |
2720 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
2721 | if (unlikely(!req)) | |
2722 | return -ENOMEM; | |
2723 | ||
2724 | ffs_ep->ep = ep; | |
2725 | ffs_ep->req = req; | |
2726 | func->eps_revmap[ds->bEndpointAddress & | |
2727 | USB_ENDPOINT_NUMBER_MASK] = idx + 1; | |
1b0bf88f RB |
2728 | /* |
2729 | * If we use virtual address mapping, we restore | |
2730 | * original bEndpointAddress value. | |
2731 | */ | |
2732 | if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) | |
2733 | ds->bEndpointAddress = bEndpointAddress; | |
ddf8abd2 MN |
2734 | } |
2735 | ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); | |
2736 | ||
2737 | return 0; | |
2738 | } | |
2739 | ||
ddf8abd2 MN |
2740 | static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, |
2741 | struct usb_descriptor_header *desc, | |
2742 | void *priv) | |
2743 | { | |
2744 | struct ffs_function *func = priv; | |
2745 | unsigned idx; | |
2746 | u8 newValue; | |
2747 | ||
2748 | switch (type) { | |
2749 | default: | |
2750 | case FFS_DESCRIPTOR: | |
2751 | /* Handled in previous pass by __ffs_func_bind_do_descs() */ | |
2752 | return 0; | |
2753 | ||
2754 | case FFS_INTERFACE: | |
2755 | idx = *valuep; | |
2756 | if (func->interfaces_nums[idx] < 0) { | |
2757 | int id = usb_interface_id(func->conf, &func->function); | |
2758 | if (unlikely(id < 0)) | |
2759 | return id; | |
2760 | func->interfaces_nums[idx] = id; | |
2761 | } | |
2762 | newValue = func->interfaces_nums[idx]; | |
2763 | break; | |
2764 | ||
2765 | case FFS_STRING: | |
2766 | /* String' IDs are allocated when fsf_data is bound to cdev */ | |
2767 | newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; | |
2768 | break; | |
2769 | ||
2770 | case FFS_ENDPOINT: | |
5ab54cf7 MN |
2771 | /* |
2772 | * USB_DT_ENDPOINT are handled in | |
2773 | * __ffs_func_bind_do_descs(). | |
2774 | */ | |
ddf8abd2 MN |
2775 | if (desc->bDescriptorType == USB_DT_ENDPOINT) |
2776 | return 0; | |
2777 | ||
2778 | idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; | |
2779 | if (unlikely(!func->eps[idx].ep)) | |
2780 | return -EINVAL; | |
2781 | ||
2782 | { | |
2783 | struct usb_endpoint_descriptor **descs; | |
2784 | descs = func->eps[idx].descs; | |
2785 | newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; | |
2786 | } | |
2787 | break; | |
2788 | } | |
2789 | ||
aa02f172 | 2790 | pr_vdebug("%02x -> %02x\n", *valuep, newValue); |
ddf8abd2 MN |
2791 | *valuep = newValue; |
2792 | return 0; | |
2793 | } | |
2794 | ||
f0175ab5 AP |
2795 | static int __ffs_func_bind_do_os_desc(enum ffs_os_desc_type type, |
2796 | struct usb_os_desc_header *h, void *data, | |
2797 | unsigned len, void *priv) | |
2798 | { | |
2799 | struct ffs_function *func = priv; | |
2800 | u8 length = 0; | |
2801 | ||
2802 | switch (type) { | |
2803 | case FFS_OS_DESC_EXT_COMPAT: { | |
2804 | struct usb_ext_compat_desc *desc = data; | |
2805 | struct usb_os_desc_table *t; | |
2806 | ||
2807 | t = &func->function.os_desc_table[desc->bFirstInterfaceNumber]; | |
2808 | t->if_id = func->interfaces_nums[desc->bFirstInterfaceNumber]; | |
2809 | memcpy(t->os_desc->ext_compat_id, &desc->CompatibleID, | |
2810 | ARRAY_SIZE(desc->CompatibleID) + | |
2811 | ARRAY_SIZE(desc->SubCompatibleID)); | |
2812 | length = sizeof(*desc); | |
2813 | } | |
2814 | break; | |
2815 | case FFS_OS_DESC_EXT_PROP: { | |
2816 | struct usb_ext_prop_desc *desc = data; | |
2817 | struct usb_os_desc_table *t; | |
2818 | struct usb_os_desc_ext_prop *ext_prop; | |
2819 | char *ext_prop_name; | |
2820 | char *ext_prop_data; | |
2821 | ||
2822 | t = &func->function.os_desc_table[h->interface]; | |
2823 | t->if_id = func->interfaces_nums[h->interface]; | |
2824 | ||
2825 | ext_prop = func->ffs->ms_os_descs_ext_prop_avail; | |
2826 | func->ffs->ms_os_descs_ext_prop_avail += sizeof(*ext_prop); | |
2827 | ||
2828 | ext_prop->type = le32_to_cpu(desc->dwPropertyDataType); | |
2829 | ext_prop->name_len = le16_to_cpu(desc->wPropertyNameLength); | |
2830 | ext_prop->data_len = le32_to_cpu(*(u32 *) | |
2831 | usb_ext_prop_data_len_ptr(data, ext_prop->name_len)); | |
2832 | length = ext_prop->name_len + ext_prop->data_len + 14; | |
2833 | ||
2834 | ext_prop_name = func->ffs->ms_os_descs_ext_prop_name_avail; | |
2835 | func->ffs->ms_os_descs_ext_prop_name_avail += | |
2836 | ext_prop->name_len; | |
2837 | ||
2838 | ext_prop_data = func->ffs->ms_os_descs_ext_prop_data_avail; | |
2839 | func->ffs->ms_os_descs_ext_prop_data_avail += | |
2840 | ext_prop->data_len; | |
2841 | memcpy(ext_prop_data, | |
2842 | usb_ext_prop_data_ptr(data, ext_prop->name_len), | |
2843 | ext_prop->data_len); | |
2844 | /* unicode data reported to the host as "WCHAR"s */ | |
2845 | switch (ext_prop->type) { | |
2846 | case USB_EXT_PROP_UNICODE: | |
2847 | case USB_EXT_PROP_UNICODE_ENV: | |
2848 | case USB_EXT_PROP_UNICODE_LINK: | |
2849 | case USB_EXT_PROP_UNICODE_MULTI: | |
2850 | ext_prop->data_len *= 2; | |
2851 | break; | |
2852 | } | |
2853 | ext_prop->data = ext_prop_data; | |
2854 | ||
2855 | memcpy(ext_prop_name, usb_ext_prop_name_ptr(data), | |
2856 | ext_prop->name_len); | |
2857 | /* property name reported to the host as "WCHAR"s */ | |
2858 | ext_prop->name_len *= 2; | |
2859 | ext_prop->name = ext_prop_name; | |
2860 | ||
2861 | t->os_desc->ext_prop_len += | |
2862 | ext_prop->name_len + ext_prop->data_len + 14; | |
2863 | ++t->os_desc->ext_prop_count; | |
2864 | list_add_tail(&ext_prop->entry, &t->os_desc->ext_prop); | |
2865 | } | |
2866 | break; | |
2867 | default: | |
2868 | pr_vdebug("unknown descriptor: %d\n", type); | |
2869 | } | |
2870 | ||
2871 | return length; | |
2872 | } | |
2873 | ||
5920cda6 AP |
2874 | static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, |
2875 | struct usb_configuration *c) | |
2876 | { | |
2877 | struct ffs_function *func = ffs_func_from_usb(f); | |
2878 | struct f_fs_opts *ffs_opts = | |
2879 | container_of(f->fi, struct f_fs_opts, func_inst); | |
2880 | int ret; | |
2881 | ||
2882 | ENTER(); | |
2883 | ||
2884 | /* | |
2885 | * Legacy gadget triggers binding in functionfs_ready_callback, | |
2886 | * which already uses locking; taking the same lock here would | |
2887 | * cause a deadlock. | |
2888 | * | |
2889 | * Configfs-enabled gadgets however do need ffs_dev_lock. | |
2890 | */ | |
2891 | if (!ffs_opts->no_configfs) | |
2892 | ffs_dev_lock(); | |
2893 | ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; | |
2894 | func->ffs = ffs_opts->dev->ffs_data; | |
2895 | if (!ffs_opts->no_configfs) | |
2896 | ffs_dev_unlock(); | |
2897 | if (ret) | |
2898 | return ERR_PTR(ret); | |
2899 | ||
2900 | func->conf = c; | |
2901 | func->gadget = c->cdev->gadget; | |
2902 | ||
5920cda6 AP |
2903 | /* |
2904 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
2905 | * configurations are bound in sequence with list_for_each_entry, | |
2906 | * in each configuration its functions are bound in sequence | |
2907 | * with list_for_each_entry, so we assume no race condition | |
2908 | * with regard to ffs_opts->bound access | |
2909 | */ | |
2910 | if (!ffs_opts->refcnt) { | |
2911 | ret = functionfs_bind(func->ffs, c->cdev); | |
2912 | if (ret) | |
2913 | return ERR_PTR(ret); | |
2914 | } | |
2915 | ffs_opts->refcnt++; | |
2916 | func->function.strings = func->ffs->stringtabs; | |
2917 | ||
2918 | return ffs_opts; | |
2919 | } | |
5920cda6 AP |
2920 | |
2921 | static int _ffs_func_bind(struct usb_configuration *c, | |
2922 | struct usb_function *f) | |
ddf8abd2 MN |
2923 | { |
2924 | struct ffs_function *func = ffs_func_from_usb(f); | |
2925 | struct ffs_data *ffs = func->ffs; | |
2926 | ||
2927 | const int full = !!func->ffs->fs_descs_count; | |
2928 | const int high = gadget_is_dualspeed(func->gadget) && | |
2929 | func->ffs->hs_descs_count; | |
8d4e897b MG |
2930 | const int super = gadget_is_superspeed(func->gadget) && |
2931 | func->ffs->ss_descs_count; | |
ddf8abd2 | 2932 | |
f0175ab5 | 2933 | int fs_len, hs_len, ss_len, ret, i; |
0015f915 | 2934 | struct ffs_ep *eps_ptr; |
ddf8abd2 MN |
2935 | |
2936 | /* Make it a single chunk, less management later on */ | |
e6f3862f AP |
2937 | vla_group(d); |
2938 | vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); | |
2939 | vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, | |
2940 | full ? ffs->fs_descs_count + 1 : 0); | |
2941 | vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, | |
2942 | high ? ffs->hs_descs_count + 1 : 0); | |
8d4e897b MG |
2943 | vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, |
2944 | super ? ffs->ss_descs_count + 1 : 0); | |
e6f3862f | 2945 | vla_item_with_sz(d, short, inums, ffs->interfaces_count); |
f0175ab5 AP |
2946 | vla_item_with_sz(d, struct usb_os_desc_table, os_desc_table, |
2947 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2948 | vla_item_with_sz(d, char[16], ext_compat, | |
2949 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2950 | vla_item_with_sz(d, struct usb_os_desc, os_desc, | |
2951 | c->cdev->use_os_string ? ffs->interfaces_count : 0); | |
2952 | vla_item_with_sz(d, struct usb_os_desc_ext_prop, ext_prop, | |
2953 | ffs->ms_os_descs_ext_prop_count); | |
2954 | vla_item_with_sz(d, char, ext_prop_name, | |
2955 | ffs->ms_os_descs_ext_prop_name_len); | |
2956 | vla_item_with_sz(d, char, ext_prop_data, | |
2957 | ffs->ms_os_descs_ext_prop_data_len); | |
ac8dde11 | 2958 | vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); |
e6f3862f | 2959 | char *vlabuf; |
ddf8abd2 MN |
2960 | |
2961 | ENTER(); | |
2962 | ||
8d4e897b MG |
2963 | /* Has descriptors only for speeds gadget does not support */ |
2964 | if (unlikely(!(full | high | super))) | |
ddf8abd2 MN |
2965 | return -ENOTSUPP; |
2966 | ||
e6f3862f | 2967 | /* Allocate a single chunk, less management later on */ |
f0175ab5 | 2968 | vlabuf = kzalloc(vla_group_size(d), GFP_KERNEL); |
e6f3862f | 2969 | if (unlikely(!vlabuf)) |
ddf8abd2 MN |
2970 | return -ENOMEM; |
2971 | ||
f0175ab5 AP |
2972 | ffs->ms_os_descs_ext_prop_avail = vla_ptr(vlabuf, d, ext_prop); |
2973 | ffs->ms_os_descs_ext_prop_name_avail = | |
2974 | vla_ptr(vlabuf, d, ext_prop_name); | |
2975 | ffs->ms_os_descs_ext_prop_data_avail = | |
2976 | vla_ptr(vlabuf, d, ext_prop_data); | |
2977 | ||
ac8dde11 MN |
2978 | /* Copy descriptors */ |
2979 | memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, | |
2980 | ffs->raw_descs_length); | |
8d4e897b | 2981 | |
e6f3862f | 2982 | memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); |
0015f915 DC |
2983 | eps_ptr = vla_ptr(vlabuf, d, eps); |
2984 | for (i = 0; i < ffs->eps_count; i++) | |
2985 | eps_ptr[i].num = -1; | |
ddf8abd2 | 2986 | |
e6f3862f AP |
2987 | /* Save pointers |
2988 | * d_eps == vlabuf, func->eps used to kfree vlabuf later | |
2989 | */ | |
2990 | func->eps = vla_ptr(vlabuf, d, eps); | |
2991 | func->interfaces_nums = vla_ptr(vlabuf, d, inums); | |
ddf8abd2 | 2992 | |
5ab54cf7 MN |
2993 | /* |
2994 | * Go through all the endpoint descriptors and allocate | |
ddf8abd2 | 2995 | * endpoints first, so that later we can rewrite the endpoint |
5ab54cf7 MN |
2996 | * numbers without worrying that it may be described later on. |
2997 | */ | |
ddf8abd2 | 2998 | if (likely(full)) { |
e6f3862f | 2999 | func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); |
8d4e897b MG |
3000 | fs_len = ffs_do_descs(ffs->fs_descs_count, |
3001 | vla_ptr(vlabuf, d, raw_descs), | |
3002 | d_raw_descs__sz, | |
3003 | __ffs_func_bind_do_descs, func); | |
3004 | if (unlikely(fs_len < 0)) { | |
3005 | ret = fs_len; | |
ddf8abd2 | 3006 | goto error; |
8d4e897b | 3007 | } |
ddf8abd2 | 3008 | } else { |
8d4e897b | 3009 | fs_len = 0; |
ddf8abd2 MN |
3010 | } |
3011 | ||
3012 | if (likely(high)) { | |
e6f3862f | 3013 | func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); |
8d4e897b MG |
3014 | hs_len = ffs_do_descs(ffs->hs_descs_count, |
3015 | vla_ptr(vlabuf, d, raw_descs) + fs_len, | |
3016 | d_raw_descs__sz - fs_len, | |
3017 | __ffs_func_bind_do_descs, func); | |
3018 | if (unlikely(hs_len < 0)) { | |
3019 | ret = hs_len; | |
3020 | goto error; | |
3021 | } | |
3022 | } else { | |
3023 | hs_len = 0; | |
3024 | } | |
3025 | ||
3026 | if (likely(super)) { | |
3027 | func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); | |
f0175ab5 | 3028 | ss_len = ffs_do_descs(ffs->ss_descs_count, |
8d4e897b MG |
3029 | vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, |
3030 | d_raw_descs__sz - fs_len - hs_len, | |
3031 | __ffs_func_bind_do_descs, func); | |
f0175ab5 AP |
3032 | if (unlikely(ss_len < 0)) { |
3033 | ret = ss_len; | |
8854894c | 3034 | goto error; |
f0175ab5 AP |
3035 | } |
3036 | } else { | |
3037 | ss_len = 0; | |
ddf8abd2 MN |
3038 | } |
3039 | ||
5ab54cf7 MN |
3040 | /* |
3041 | * Now handle interface numbers allocation and interface and | |
3042 | * endpoint numbers rewriting. We can do that in one go | |
3043 | * now. | |
3044 | */ | |
ddf8abd2 | 3045 | ret = ffs_do_descs(ffs->fs_descs_count + |
8d4e897b MG |
3046 | (high ? ffs->hs_descs_count : 0) + |
3047 | (super ? ffs->ss_descs_count : 0), | |
e6f3862f | 3048 | vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, |
ddf8abd2 MN |
3049 | __ffs_func_bind_do_nums, func); |
3050 | if (unlikely(ret < 0)) | |
3051 | goto error; | |
3052 | ||
f0175ab5 | 3053 | func->function.os_desc_table = vla_ptr(vlabuf, d, os_desc_table); |
c6010c8b | 3054 | if (c->cdev->use_os_string) { |
f0175ab5 AP |
3055 | for (i = 0; i < ffs->interfaces_count; ++i) { |
3056 | struct usb_os_desc *desc; | |
3057 | ||
3058 | desc = func->function.os_desc_table[i].os_desc = | |
3059 | vla_ptr(vlabuf, d, os_desc) + | |
3060 | i * sizeof(struct usb_os_desc); | |
3061 | desc->ext_compat_id = | |
3062 | vla_ptr(vlabuf, d, ext_compat) + i * 16; | |
3063 | INIT_LIST_HEAD(&desc->ext_prop); | |
3064 | } | |
c6010c8b JL |
3065 | ret = ffs_do_os_descs(ffs->ms_os_descs_count, |
3066 | vla_ptr(vlabuf, d, raw_descs) + | |
3067 | fs_len + hs_len + ss_len, | |
3068 | d_raw_descs__sz - fs_len - hs_len - | |
3069 | ss_len, | |
3070 | __ffs_func_bind_do_os_desc, func); | |
3071 | if (unlikely(ret < 0)) | |
3072 | goto error; | |
3073 | } | |
f0175ab5 AP |
3074 | func->function.os_desc_n = |
3075 | c->cdev->use_os_string ? ffs->interfaces_count : 0; | |
3076 | ||
ddf8abd2 MN |
3077 | /* And we're done */ |
3078 | ffs_event_add(ffs, FUNCTIONFS_BIND); | |
3079 | return 0; | |
3080 | ||
3081 | error: | |
3082 | /* XXX Do we need to release all claimed endpoints here? */ | |
3083 | return ret; | |
3084 | } | |
3085 | ||
5920cda6 AP |
3086 | static int ffs_func_bind(struct usb_configuration *c, |
3087 | struct usb_function *f) | |
3088 | { | |
5920cda6 | 3089 | struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); |
55d81121 RB |
3090 | struct ffs_function *func = ffs_func_from_usb(f); |
3091 | int ret; | |
5920cda6 AP |
3092 | |
3093 | if (IS_ERR(ffs_opts)) | |
3094 | return PTR_ERR(ffs_opts); | |
5920cda6 | 3095 | |
55d81121 RB |
3096 | ret = _ffs_func_bind(c, f); |
3097 | if (ret && !--ffs_opts->refcnt) | |
3098 | functionfs_unbind(func->ffs); | |
3099 | ||
3100 | return ret; | |
5920cda6 AP |
3101 | } |
3102 | ||
ddf8abd2 MN |
3103 | |
3104 | /* Other USB function hooks *************************************************/ | |
3105 | ||
18d6b32f RB |
3106 | static void ffs_reset_work(struct work_struct *work) |
3107 | { | |
3108 | struct ffs_data *ffs = container_of(work, | |
3109 | struct ffs_data, reset_work); | |
3110 | ffs_data_reset(ffs); | |
3111 | } | |
3112 | ||
ddf8abd2 MN |
3113 | static int ffs_func_set_alt(struct usb_function *f, |
3114 | unsigned interface, unsigned alt) | |
3115 | { | |
3116 | struct ffs_function *func = ffs_func_from_usb(f); | |
3117 | struct ffs_data *ffs = func->ffs; | |
3118 | int ret = 0, intf; | |
3119 | ||
3120 | if (alt != (unsigned)-1) { | |
3121 | intf = ffs_func_revmap_intf(func, interface); | |
3122 | if (unlikely(intf < 0)) | |
3123 | return intf; | |
3124 | } | |
3125 | ||
3126 | if (ffs->func) | |
3127 | ffs_func_eps_disable(ffs->func); | |
3128 | ||
18d6b32f RB |
3129 | if (ffs->state == FFS_DEACTIVATED) { |
3130 | ffs->state = FFS_CLOSING; | |
3131 | INIT_WORK(&ffs->reset_work, ffs_reset_work); | |
3132 | schedule_work(&ffs->reset_work); | |
3133 | return -ENODEV; | |
3134 | } | |
3135 | ||
ddf8abd2 MN |
3136 | if (ffs->state != FFS_ACTIVE) |
3137 | return -ENODEV; | |
3138 | ||
3139 | if (alt == (unsigned)-1) { | |
3140 | ffs->func = NULL; | |
3141 | ffs_event_add(ffs, FUNCTIONFS_DISABLE); | |
3142 | return 0; | |
3143 | } | |
3144 | ||
3145 | ffs->func = func; | |
3146 | ret = ffs_func_eps_enable(func); | |
3147 | if (likely(ret >= 0)) | |
3148 | ffs_event_add(ffs, FUNCTIONFS_ENABLE); | |
3149 | return ret; | |
3150 | } | |
3151 | ||
3152 | static void ffs_func_disable(struct usb_function *f) | |
3153 | { | |
3154 | ffs_func_set_alt(f, 0, (unsigned)-1); | |
3155 | } | |
3156 | ||
3157 | static int ffs_func_setup(struct usb_function *f, | |
3158 | const struct usb_ctrlrequest *creq) | |
3159 | { | |
3160 | struct ffs_function *func = ffs_func_from_usb(f); | |
3161 | struct ffs_data *ffs = func->ffs; | |
3162 | unsigned long flags; | |
3163 | int ret; | |
3164 | ||
3165 | ENTER(); | |
3166 | ||
aa02f172 MN |
3167 | pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); |
3168 | pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); | |
3169 | pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); | |
3170 | pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); | |
3171 | pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); | |
ddf8abd2 | 3172 | |
5ab54cf7 MN |
3173 | /* |
3174 | * Most requests directed to interface go through here | |
ddf8abd2 MN |
3175 | * (notable exceptions are set/get interface) so we need to |
3176 | * handle them. All other either handled by composite or | |
3177 | * passed to usb_configuration->setup() (if one is set). No | |
3178 | * matter, we will handle requests directed to endpoint here | |
54dfce6d FH |
3179 | * as well (as it's straightforward). Other request recipient |
3180 | * types are only handled when the user flag FUNCTIONFS_ALL_CTRL_RECIP | |
3181 | * is being used. | |
5ab54cf7 | 3182 | */ |
ddf8abd2 MN |
3183 | if (ffs->state != FFS_ACTIVE) |
3184 | return -ENODEV; | |
3185 | ||
3186 | switch (creq->bRequestType & USB_RECIP_MASK) { | |
3187 | case USB_RECIP_INTERFACE: | |
3188 | ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); | |
3189 | if (unlikely(ret < 0)) | |
3190 | return ret; | |
3191 | break; | |
3192 | ||
3193 | case USB_RECIP_ENDPOINT: | |
3194 | ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); | |
3195 | if (unlikely(ret < 0)) | |
3196 | return ret; | |
1b0bf88f RB |
3197 | if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) |
3198 | ret = func->ffs->eps_addrmap[ret]; | |
ddf8abd2 MN |
3199 | break; |
3200 | ||
3201 | default: | |
54dfce6d FH |
3202 | if (func->ffs->user_flags & FUNCTIONFS_ALL_CTRL_RECIP) |
3203 | ret = le16_to_cpu(creq->wIndex); | |
3204 | else | |
3205 | return -EOPNOTSUPP; | |
ddf8abd2 MN |
3206 | } |
3207 | ||
3208 | spin_lock_irqsave(&ffs->ev.waitq.lock, flags); | |
3209 | ffs->ev.setup = *creq; | |
3210 | ffs->ev.setup.wIndex = cpu_to_le16(ret); | |
3211 | __ffs_event_add(ffs, FUNCTIONFS_SETUP); | |
3212 | spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); | |
3213 | ||
3214 | return 0; | |
3215 | } | |
3216 | ||
54dfce6d | 3217 | static bool ffs_func_req_match(struct usb_function *f, |
1a00b457 FH |
3218 | const struct usb_ctrlrequest *creq, |
3219 | bool config0) | |
54dfce6d FH |
3220 | { |
3221 | struct ffs_function *func = ffs_func_from_usb(f); | |
3222 | ||
4368c28a | 3223 | if (config0 && !(func->ffs->user_flags & FUNCTIONFS_CONFIG0_SETUP)) |
1a00b457 FH |
3224 | return false; |
3225 | ||
54dfce6d FH |
3226 | switch (creq->bRequestType & USB_RECIP_MASK) { |
3227 | case USB_RECIP_INTERFACE: | |
05e78c69 FH |
3228 | return (ffs_func_revmap_intf(func, |
3229 | le16_to_cpu(creq->wIndex)) >= 0); | |
54dfce6d | 3230 | case USB_RECIP_ENDPOINT: |
05e78c69 FH |
3231 | return (ffs_func_revmap_ep(func, |
3232 | le16_to_cpu(creq->wIndex)) >= 0); | |
54dfce6d FH |
3233 | default: |
3234 | return (bool) (func->ffs->user_flags & | |
3235 | FUNCTIONFS_ALL_CTRL_RECIP); | |
3236 | } | |
3237 | } | |
3238 | ||
ddf8abd2 MN |
3239 | static void ffs_func_suspend(struct usb_function *f) |
3240 | { | |
3241 | ENTER(); | |
3242 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); | |
3243 | } | |
3244 | ||
3245 | static void ffs_func_resume(struct usb_function *f) | |
3246 | { | |
3247 | ENTER(); | |
3248 | ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); | |
3249 | } | |
3250 | ||
3251 | ||
5ab54cf7 | 3252 | /* Endpoint and interface numbers reverse mapping ***************************/ |
ddf8abd2 MN |
3253 | |
3254 | static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) | |
3255 | { | |
3256 | num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; | |
3257 | return num ? num : -EDOM; | |
3258 | } | |
3259 | ||
3260 | static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) | |
3261 | { | |
3262 | short *nums = func->interfaces_nums; | |
3263 | unsigned count = func->ffs->interfaces_count; | |
3264 | ||
3265 | for (; count; --count, ++nums) { | |
3266 | if (*nums >= 0 && *nums == intf) | |
3267 | return nums - func->interfaces_nums; | |
3268 | } | |
3269 | ||
3270 | return -EDOM; | |
3271 | } | |
3272 | ||
3273 | ||
4b187fce AP |
3274 | /* Devices management *******************************************************/ |
3275 | ||
3276 | static LIST_HEAD(ffs_devices); | |
3277 | ||
da13a773 | 3278 | static struct ffs_dev *_ffs_do_find_dev(const char *name) |
4b187fce AP |
3279 | { |
3280 | struct ffs_dev *dev; | |
3281 | ||
3282 | list_for_each_entry(dev, &ffs_devices, entry) { | |
3283 | if (!dev->name || !name) | |
3284 | continue; | |
3285 | if (strcmp(dev->name, name) == 0) | |
3286 | return dev; | |
3287 | } | |
b658499f | 3288 | |
4b187fce AP |
3289 | return NULL; |
3290 | } | |
3291 | ||
3292 | /* | |
3293 | * ffs_lock must be taken by the caller of this function | |
3294 | */ | |
da13a773 | 3295 | static struct ffs_dev *_ffs_get_single_dev(void) |
4b187fce AP |
3296 | { |
3297 | struct ffs_dev *dev; | |
3298 | ||
3299 | if (list_is_singular(&ffs_devices)) { | |
3300 | dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); | |
3301 | if (dev->single) | |
3302 | return dev; | |
3303 | } | |
3304 | ||
3305 | return NULL; | |
3306 | } | |
3307 | ||
3308 | /* | |
3309 | * ffs_lock must be taken by the caller of this function | |
3310 | */ | |
da13a773 | 3311 | static struct ffs_dev *_ffs_find_dev(const char *name) |
4b187fce AP |
3312 | { |
3313 | struct ffs_dev *dev; | |
3314 | ||
da13a773 | 3315 | dev = _ffs_get_single_dev(); |
4b187fce AP |
3316 | if (dev) |
3317 | return dev; | |
3318 | ||
da13a773 | 3319 | return _ffs_do_find_dev(name); |
4b187fce AP |
3320 | } |
3321 | ||
b658499f AP |
3322 | /* Configfs support *********************************************************/ |
3323 | ||
3324 | static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) | |
3325 | { | |
3326 | return container_of(to_config_group(item), struct f_fs_opts, | |
3327 | func_inst.group); | |
3328 | } | |
3329 | ||
3330 | static void ffs_attr_release(struct config_item *item) | |
3331 | { | |
3332 | struct f_fs_opts *opts = to_ffs_opts(item); | |
3333 | ||
3334 | usb_put_function_instance(&opts->func_inst); | |
3335 | } | |
3336 | ||
3337 | static struct configfs_item_operations ffs_item_ops = { | |
3338 | .release = ffs_attr_release, | |
3339 | }; | |
3340 | ||
3341 | static struct config_item_type ffs_func_type = { | |
3342 | .ct_item_ops = &ffs_item_ops, | |
3343 | .ct_owner = THIS_MODULE, | |
3344 | }; | |
3345 | ||
3346 | ||
5920cda6 AP |
3347 | /* Function registration interface ******************************************/ |
3348 | ||
5920cda6 AP |
3349 | static void ffs_free_inst(struct usb_function_instance *f) |
3350 | { | |
3351 | struct f_fs_opts *opts; | |
3352 | ||
3353 | opts = to_f_fs_opts(f); | |
3354 | ffs_dev_lock(); | |
da13a773 | 3355 | _ffs_free_dev(opts->dev); |
5920cda6 AP |
3356 | ffs_dev_unlock(); |
3357 | kfree(opts); | |
3358 | } | |
3359 | ||
b658499f AP |
3360 | #define MAX_INST_NAME_LEN 40 |
3361 | ||
3362 | static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) | |
3363 | { | |
3364 | struct f_fs_opts *opts; | |
3365 | char *ptr; | |
3366 | const char *tmp; | |
3367 | int name_len, ret; | |
3368 | ||
3369 | name_len = strlen(name) + 1; | |
3370 | if (name_len > MAX_INST_NAME_LEN) | |
3371 | return -ENAMETOOLONG; | |
3372 | ||
3373 | ptr = kstrndup(name, name_len, GFP_KERNEL); | |
3374 | if (!ptr) | |
3375 | return -ENOMEM; | |
3376 | ||
3377 | opts = to_f_fs_opts(fi); | |
3378 | tmp = NULL; | |
3379 | ||
3380 | ffs_dev_lock(); | |
3381 | ||
3382 | tmp = opts->dev->name_allocated ? opts->dev->name : NULL; | |
3383 | ret = _ffs_name_dev(opts->dev, ptr); | |
3384 | if (ret) { | |
3385 | kfree(ptr); | |
3386 | ffs_dev_unlock(); | |
3387 | return ret; | |
3388 | } | |
3389 | opts->dev->name_allocated = true; | |
3390 | ||
3391 | ffs_dev_unlock(); | |
3392 | ||
3393 | kfree(tmp); | |
3394 | ||
3395 | return 0; | |
3396 | } | |
3397 | ||
5920cda6 AP |
3398 | static struct usb_function_instance *ffs_alloc_inst(void) |
3399 | { | |
3400 | struct f_fs_opts *opts; | |
3401 | struct ffs_dev *dev; | |
3402 | ||
3403 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
3404 | if (!opts) | |
3405 | return ERR_PTR(-ENOMEM); | |
3406 | ||
b658499f | 3407 | opts->func_inst.set_inst_name = ffs_set_inst_name; |
5920cda6 AP |
3408 | opts->func_inst.free_func_inst = ffs_free_inst; |
3409 | ffs_dev_lock(); | |
da13a773 | 3410 | dev = _ffs_alloc_dev(); |
5920cda6 AP |
3411 | ffs_dev_unlock(); |
3412 | if (IS_ERR(dev)) { | |
3413 | kfree(opts); | |
3414 | return ERR_CAST(dev); | |
3415 | } | |
3416 | opts->dev = dev; | |
b658499f | 3417 | dev->opts = opts; |
5920cda6 | 3418 | |
b658499f AP |
3419 | config_group_init_type_name(&opts->func_inst.group, "", |
3420 | &ffs_func_type); | |
5920cda6 AP |
3421 | return &opts->func_inst; |
3422 | } | |
3423 | ||
3424 | static void ffs_free(struct usb_function *f) | |
3425 | { | |
3426 | kfree(ffs_func_from_usb(f)); | |
3427 | } | |
3428 | ||
3429 | static void ffs_func_unbind(struct usb_configuration *c, | |
3430 | struct usb_function *f) | |
3431 | { | |
3432 | struct ffs_function *func = ffs_func_from_usb(f); | |
3433 | struct ffs_data *ffs = func->ffs; | |
3434 | struct f_fs_opts *opts = | |
3435 | container_of(f->fi, struct f_fs_opts, func_inst); | |
3436 | struct ffs_ep *ep = func->eps; | |
3437 | unsigned count = ffs->eps_count; | |
3438 | unsigned long flags; | |
3439 | ||
3440 | ENTER(); | |
3441 | if (ffs->func == func) { | |
3442 | ffs_func_eps_disable(func); | |
3443 | ffs->func = NULL; | |
3444 | } | |
3445 | ||
3446 | if (!--opts->refcnt) | |
3447 | functionfs_unbind(ffs); | |
3448 | ||
3449 | /* cleanup after autoconfig */ | |
3450 | spin_lock_irqsave(&func->ffs->eps_lock, flags); | |
3451 | do { | |
3452 | if (ep->ep && ep->req) | |
3453 | usb_ep_free_request(ep->ep, ep->req); | |
3454 | ep->req = NULL; | |
3455 | ++ep; | |
3456 | } while (--count); | |
3457 | spin_unlock_irqrestore(&func->ffs->eps_lock, flags); | |
3458 | kfree(func->eps); | |
3459 | func->eps = NULL; | |
3460 | /* | |
3461 | * eps, descriptors and interfaces_nums are allocated in the | |
3462 | * same chunk so only one free is required. | |
3463 | */ | |
3464 | func->function.fs_descriptors = NULL; | |
3465 | func->function.hs_descriptors = NULL; | |
8d4e897b | 3466 | func->function.ss_descriptors = NULL; |
5920cda6 AP |
3467 | func->interfaces_nums = NULL; |
3468 | ||
3469 | ffs_event_add(ffs, FUNCTIONFS_UNBIND); | |
3470 | } | |
3471 | ||
3472 | static struct usb_function *ffs_alloc(struct usb_function_instance *fi) | |
3473 | { | |
3474 | struct ffs_function *func; | |
3475 | ||
3476 | ENTER(); | |
3477 | ||
3478 | func = kzalloc(sizeof(*func), GFP_KERNEL); | |
3479 | if (unlikely(!func)) | |
3480 | return ERR_PTR(-ENOMEM); | |
3481 | ||
3482 | func->function.name = "Function FS Gadget"; | |
3483 | ||
3484 | func->function.bind = ffs_func_bind; | |
3485 | func->function.unbind = ffs_func_unbind; | |
3486 | func->function.set_alt = ffs_func_set_alt; | |
3487 | func->function.disable = ffs_func_disable; | |
3488 | func->function.setup = ffs_func_setup; | |
54dfce6d | 3489 | func->function.req_match = ffs_func_req_match; |
5920cda6 AP |
3490 | func->function.suspend = ffs_func_suspend; |
3491 | func->function.resume = ffs_func_resume; | |
3492 | func->function.free_func = ffs_free; | |
3493 | ||
3494 | return &func->function; | |
3495 | } | |
3496 | ||
4b187fce AP |
3497 | /* |
3498 | * ffs_lock must be taken by the caller of this function | |
3499 | */ | |
da13a773 | 3500 | static struct ffs_dev *_ffs_alloc_dev(void) |
4b187fce AP |
3501 | { |
3502 | struct ffs_dev *dev; | |
3503 | int ret; | |
3504 | ||
da13a773 | 3505 | if (_ffs_get_single_dev()) |
4b187fce AP |
3506 | return ERR_PTR(-EBUSY); |
3507 | ||
3508 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
3509 | if (!dev) | |
3510 | return ERR_PTR(-ENOMEM); | |
3511 | ||
3512 | if (list_empty(&ffs_devices)) { | |
3513 | ret = functionfs_init(); | |
3514 | if (ret) { | |
3515 | kfree(dev); | |
3516 | return ERR_PTR(ret); | |
3517 | } | |
3518 | } | |
3519 | ||
3520 | list_add(&dev->entry, &ffs_devices); | |
3521 | ||
3522 | return dev; | |
3523 | } | |
3524 | ||
3525 | /* | |
3526 | * ffs_lock must be taken by the caller of this function | |
3527 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3528 | */ | |
3529 | static int _ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3530 | { | |
3531 | struct ffs_dev *existing; | |
3532 | ||
da13a773 | 3533 | existing = _ffs_do_find_dev(name); |
4b187fce AP |
3534 | if (existing) |
3535 | return -EBUSY; | |
ab13cb0c | 3536 | |
4b187fce AP |
3537 | dev->name = name; |
3538 | ||
3539 | return 0; | |
3540 | } | |
3541 | ||
3542 | /* | |
3543 | * The caller is responsible for "name" being available whenever f_fs needs it | |
3544 | */ | |
3545 | int ffs_name_dev(struct ffs_dev *dev, const char *name) | |
3546 | { | |
3547 | int ret; | |
3548 | ||
3549 | ffs_dev_lock(); | |
3550 | ret = _ffs_name_dev(dev, name); | |
3551 | ffs_dev_unlock(); | |
3552 | ||
3553 | return ret; | |
3554 | } | |
0700faaf | 3555 | EXPORT_SYMBOL_GPL(ffs_name_dev); |
4b187fce AP |
3556 | |
3557 | int ffs_single_dev(struct ffs_dev *dev) | |
3558 | { | |
3559 | int ret; | |
3560 | ||
3561 | ret = 0; | |
3562 | ffs_dev_lock(); | |
3563 | ||
3564 | if (!list_is_singular(&ffs_devices)) | |
3565 | ret = -EBUSY; | |
3566 | else | |
3567 | dev->single = true; | |
3568 | ||
3569 | ffs_dev_unlock(); | |
3570 | return ret; | |
3571 | } | |
0700faaf | 3572 | EXPORT_SYMBOL_GPL(ffs_single_dev); |
4b187fce AP |
3573 | |
3574 | /* | |
3575 | * ffs_lock must be taken by the caller of this function | |
3576 | */ | |
da13a773 | 3577 | static void _ffs_free_dev(struct ffs_dev *dev) |
4b187fce AP |
3578 | { |
3579 | list_del(&dev->entry); | |
b658499f AP |
3580 | if (dev->name_allocated) |
3581 | kfree(dev->name); | |
3262ad82 JB |
3582 | |
3583 | /* Clear the private_data pointer to stop incorrect dev access */ | |
3584 | if (dev->ffs_data) | |
3585 | dev->ffs_data->private_data = NULL; | |
3586 | ||
4b187fce AP |
3587 | kfree(dev); |
3588 | if (list_empty(&ffs_devices)) | |
3589 | functionfs_cleanup(); | |
3590 | } | |
3591 | ||
3592 | static void *ffs_acquire_dev(const char *dev_name) | |
3593 | { | |
3594 | struct ffs_dev *ffs_dev; | |
3595 | ||
3596 | ENTER(); | |
3597 | ffs_dev_lock(); | |
3598 | ||
da13a773 | 3599 | ffs_dev = _ffs_find_dev(dev_name); |
4b187fce | 3600 | if (!ffs_dev) |
d668b4f3 | 3601 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3602 | else if (ffs_dev->mounted) |
3603 | ffs_dev = ERR_PTR(-EBUSY); | |
5920cda6 AP |
3604 | else if (ffs_dev->ffs_acquire_dev_callback && |
3605 | ffs_dev->ffs_acquire_dev_callback(ffs_dev)) | |
d668b4f3 | 3606 | ffs_dev = ERR_PTR(-ENOENT); |
4b187fce AP |
3607 | else |
3608 | ffs_dev->mounted = true; | |
3609 | ||
3610 | ffs_dev_unlock(); | |
3611 | return ffs_dev; | |
3612 | } | |
3613 | ||
3614 | static void ffs_release_dev(struct ffs_data *ffs_data) | |
3615 | { | |
3616 | struct ffs_dev *ffs_dev; | |
3617 | ||
3618 | ENTER(); | |
3619 | ffs_dev_lock(); | |
3620 | ||
3621 | ffs_dev = ffs_data->private_data; | |
ea365922 | 3622 | if (ffs_dev) { |
4b187fce | 3623 | ffs_dev->mounted = false; |
ea365922 AP |
3624 | |
3625 | if (ffs_dev->ffs_release_dev_callback) | |
3626 | ffs_dev->ffs_release_dev_callback(ffs_dev); | |
3627 | } | |
4b187fce AP |
3628 | |
3629 | ffs_dev_unlock(); | |
3630 | } | |
3631 | ||
3632 | static int ffs_ready(struct ffs_data *ffs) | |
3633 | { | |
3634 | struct ffs_dev *ffs_obj; | |
3635 | int ret = 0; | |
3636 | ||
3637 | ENTER(); | |
3638 | ffs_dev_lock(); | |
3639 | ||
3640 | ffs_obj = ffs->private_data; | |
3641 | if (!ffs_obj) { | |
3642 | ret = -EINVAL; | |
3643 | goto done; | |
3644 | } | |
3645 | if (WARN_ON(ffs_obj->desc_ready)) { | |
3646 | ret = -EBUSY; | |
3647 | goto done; | |
3648 | } | |
3649 | ||
3650 | ffs_obj->desc_ready = true; | |
3651 | ffs_obj->ffs_data = ffs; | |
3652 | ||
49a79d8b | 3653 | if (ffs_obj->ffs_ready_callback) { |
4b187fce | 3654 | ret = ffs_obj->ffs_ready_callback(ffs); |
49a79d8b KO |
3655 | if (ret) |
3656 | goto done; | |
3657 | } | |
4b187fce | 3658 | |
49a79d8b | 3659 | set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); |
4b187fce AP |
3660 | done: |
3661 | ffs_dev_unlock(); | |
3662 | return ret; | |
3663 | } | |
3664 | ||
3665 | static void ffs_closed(struct ffs_data *ffs) | |
3666 | { | |
3667 | struct ffs_dev *ffs_obj; | |
f14e9ad1 | 3668 | struct f_fs_opts *opts; |
b3ce3ce0 | 3669 | struct config_item *ci; |
4b187fce AP |
3670 | |
3671 | ENTER(); | |
3672 | ffs_dev_lock(); | |
3673 | ||
3674 | ffs_obj = ffs->private_data; | |
3675 | if (!ffs_obj) | |
3676 | goto done; | |
3677 | ||
3678 | ffs_obj->desc_ready = false; | |
3679 | ||
49a79d8b KO |
3680 | if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags) && |
3681 | ffs_obj->ffs_closed_callback) | |
4b187fce | 3682 | ffs_obj->ffs_closed_callback(ffs); |
b658499f | 3683 | |
f14e9ad1 RMS |
3684 | if (ffs_obj->opts) |
3685 | opts = ffs_obj->opts; | |
3686 | else | |
3687 | goto done; | |
3688 | ||
3689 | if (opts->no_configfs || !opts->func_inst.group.cg_item.ci_parent | |
2c935bc5 | 3690 | || !kref_read(&opts->func_inst.group.cg_item.ci_kref)) |
b658499f AP |
3691 | goto done; |
3692 | ||
b3ce3ce0 BW |
3693 | ci = opts->func_inst.group.cg_item.ci_parent->ci_parent; |
3694 | ffs_dev_unlock(); | |
3695 | ||
3696 | unregister_gadget_item(ci); | |
3697 | return; | |
4b187fce AP |
3698 | done: |
3699 | ffs_dev_unlock(); | |
3700 | } | |
3701 | ||
ddf8abd2 MN |
3702 | /* Misc helper functions ****************************************************/ |
3703 | ||
3704 | static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) | |
3705 | { | |
3706 | return nonblock | |
3707 | ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN | |
3708 | : mutex_lock_interruptible(mutex); | |
3709 | } | |
3710 | ||
260ef311 | 3711 | static char *ffs_prepare_buffer(const char __user *buf, size_t len) |
ddf8abd2 MN |
3712 | { |
3713 | char *data; | |
3714 | ||
3715 | if (unlikely(!len)) | |
3716 | return NULL; | |
3717 | ||
3718 | data = kmalloc(len, GFP_KERNEL); | |
3719 | if (unlikely(!data)) | |
3720 | return ERR_PTR(-ENOMEM); | |
3721 | ||
7fe9a937 | 3722 | if (unlikely(copy_from_user(data, buf, len))) { |
ddf8abd2 MN |
3723 | kfree(data); |
3724 | return ERR_PTR(-EFAULT); | |
3725 | } | |
3726 | ||
aa02f172 | 3727 | pr_vdebug("Buffer from user space:\n"); |
ddf8abd2 MN |
3728 | ffs_dump_mem("", data, len); |
3729 | ||
3730 | return data; | |
3731 | } | |
5920cda6 | 3732 | |
5920cda6 AP |
3733 | DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc); |
3734 | MODULE_LICENSE("GPL"); | |
3735 | MODULE_AUTHOR("Michal Nazarewicz"); |