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Merge branch 'master' of ../mine
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / gadget / f_fs.c
CommitLineData
ddf8abd2
MN		 1/*
2 * f_fs.c -- user mode filesystem api for usb composite funtcion controllers
3 *
4 * Copyright (C) 2010 Samsung Electronics
5 * Author: Michal Nazarewicz <m.nazarewicz@samsung.com>
6 *
7 * Based on inode.c (GadgetFS):
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.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26
27/* #define DEBUG */
28/* #define VERBOSE_DEBUG */
29
30#include <linux/blkdev.h>
b0608690 31#include <linux/pagemap.h>
ddf8abd2
MN		 32#include <asm/unaligned.h>
33#include <linux/smp_lock.h>
34
35#include <linux/usb/composite.h>
36#include <linux/usb/functionfs.h>
37
38
39#define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */
40
41
42/* Debuging *****************************************************************/
43
44#define ffs_printk(level, fmt, args...) printk(level "f_fs: " fmt "\n", ## args)
45
46#define FERR(...) ffs_printk(KERN_ERR, __VA_ARGS__)
47#define FINFO(...) ffs_printk(KERN_INFO, __VA_ARGS__)
48
49#ifdef DEBUG
50# define FDBG(...) ffs_printk(KERN_DEBUG, __VA_ARGS__)
51#else
52# define FDBG(...) do { } while (0)
53#endif /* DEBUG */
54
55#ifdef VERBOSE_DEBUG
56# define FVDBG FDBG
57#else
58# define FVDBG(...) do { } while (0)
59#endif /* VERBOSE_DEBUG */
60
61#define ENTER() FVDBG("%s()", __func__)
62
63#ifdef VERBOSE_DEBUG
64# define ffs_dump_mem(prefix, ptr, len) \
65 print_hex_dump_bytes("f_fs" prefix ": ", DUMP_PREFIX_NONE, ptr, len)
66#else
67# define ffs_dump_mem(prefix, ptr, len) do { } while (0)
68#endif
69
70
71/* The data structure and setup file ****************************************/
72
73enum ffs_state {
74 /* Waiting for descriptors and strings. */
75 /* In this state no open(2), read(2) or write(2) on epfiles
76 * may succeed (which should not be the problem as there
77 * should be no such files opened in the firts place). */
78 FFS_READ_DESCRIPTORS,
79 FFS_READ_STRINGS,
80
81 /* We've got descriptors and strings. We are or have called
82 * functionfs_ready_callback(). functionfs_bind() may have
83 * been called but we don't know. */
84 /* This is the only state in which operations on epfiles may
85 * succeed. */
86 FFS_ACTIVE,
87
88 /* All endpoints have been closed. This state is also set if
89 * we encounter an unrecoverable error. The only
90 * unrecoverable error is situation when after reading strings
91 * from user space we fail to initialise EP files or
92 * functionfs_ready_callback() returns with error (<0). */
93 /* In this state no open(2), read(2) or write(2) (both on ep0
94 * as well as epfile) may succeed (at this point epfiles are
95 * unlinked and all closed so this is not a problem; ep0 is
96 * also closed but ep0 file exists and so open(2) on ep0 must
97 * fail). */
98 FFS_CLOSING
99};
100
101
102enum ffs_setup_state {
103 /* There is no setup request pending. */
104 FFS_NO_SETUP,
105 /* User has read events and there was a setup request event
106 * there. The next read/write on ep0 will handle the
107 * request. */
108 FFS_SETUP_PENDING,
109 /* There was event pending but before user space handled it
110 * some other event was introduced which canceled existing
111 * setup. If this state is set read/write on ep0 return
112 * -EIDRM. This state is only set when adding event. */
113 FFS_SETUP_CANCELED
114};
115
116
117
118struct ffs_epfile;
119struct ffs_function;
120
121struct ffs_data {
122 struct usb_gadget *gadget;
123
124 /* Protect access read/write operations, only one read/write
125 * at a time. As a consequence protects ep0req and company.
126 * While setup request is being processed (queued) this is
127 * held. */
128 struct mutex mutex;
129
130 /* Protect access to enpoint related structures (basically
131 * usb_ep_queue(), usb_ep_dequeue(), etc. calls) except for
132 * endpint zero. */
133 spinlock_t eps_lock;
134
135 /* XXX REVISIT do we need our own request? Since we are not
136 * handling setup requests immidiatelly user space may be so
137 * slow that another setup will be sent to the gadget but this
138 * time not to us but another function and then there could be
a4ce96ac 139 * a race. Is that the case? Or maybe we can use cdev->req
ddf8abd2
MN		 140 * after all, maybe we just need some spinlock for that? */
141 struct usb_request *ep0req; /* P: mutex */
142 struct completion ep0req_completion; /* P: mutex */
143 int ep0req_status; /* P: mutex */
144
145 /* reference counter */
146 atomic_t ref;
147 /* how many files are opened (EP0 and others) */
148 atomic_t opened;
149
150 /* EP0 state */
151 enum ffs_state state;
152
153 /*
154 * Possible transations:
155 * + FFS_NO_SETUP -> FFS_SETUP_PENDING -- P: ev.waitq.lock
156 * happens only in ep0 read which is P: mutex
157 * + FFS_SETUP_PENDING -> FFS_NO_SETUP -- P: ev.waitq.lock
158 * happens only in ep0 i/o which is P: mutex
159 * + FFS_SETUP_PENDING -> FFS_SETUP_CANCELED -- P: ev.waitq.lock
160 * + FFS_SETUP_CANCELED -> FFS_NO_SETUP -- cmpxchg
161 */
162 enum ffs_setup_state setup_state;
163
164#define FFS_SETUP_STATE(ffs) \
165 ((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \
166 FFS_SETUP_CANCELED, FFS_NO_SETUP))
167
168 /* Events & such. */
169 struct {
170 u8 types[4];
171 unsigned short count;
172 /* XXX REVISIT need to update it in some places, or do we? */
173 unsigned short can_stall;
174 struct usb_ctrlrequest setup;
175
176 wait_queue_head_t waitq;
177 } ev; /* the whole structure, P: ev.waitq.lock */
178
179 /* Flags */
180 unsigned long flags;
181#define FFS_FL_CALL_CLOSED_CALLBACK 0
182#define FFS_FL_BOUND 1
183
184 /* Active function */
185 struct ffs_function *func;
186
187 /* Device name, write once when file system is mounted.
188 * Intendet for user to read if she wants. */
189 const char *dev_name;
190 /* Private data for our user (ie. gadget). Managed by
191 * user. */
192 void *private_data;
193
194 /* filled by __ffs_data_got_descs() */
195 /* real descriptors are 16 bytes after raw_descs (so you need
196 * to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the
197 * first full speed descriptor). raw_descs_length and
198 * raw_fs_descs_length do not have those 16 bytes added. */
199 const void *raw_descs;
200 unsigned raw_descs_length;
201 unsigned raw_fs_descs_length;
202 unsigned fs_descs_count;
203 unsigned hs_descs_count;
204
205 unsigned short strings_count;
206 unsigned short interfaces_count;
207 unsigned short eps_count;
208 unsigned short _pad1;
209
210 /* filled by __ffs_data_got_strings() */
211 /* ids in stringtabs are set in functionfs_bind() */
212 const void *raw_strings;
213 struct usb_gadget_strings **stringtabs;
214
215 /* File system's super block, write once when file system is mounted. */
216 struct super_block *sb;
217
218 /* File permissions, written once when fs is mounted*/
219 struct ffs_file_perms {
220 umode_t mode;
221 uid_t uid;
222 gid_t gid;
223 } file_perms;
224
225 /* The endpoint files, filled by ffs_epfiles_create(),
226 * destroyed by ffs_epfiles_destroy(). */
227 struct ffs_epfile *epfiles;
228};
229
230/* Reference counter handling */
231static void ffs_data_get(struct ffs_data *ffs);
232static void ffs_data_put(struct ffs_data *ffs);
233/* Creates new ffs_data object. */
234static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc));
235
236/* Opened counter handling. */
237static void ffs_data_opened(struct ffs_data *ffs);
238static void ffs_data_closed(struct ffs_data *ffs);
239
240/* Called with ffs->mutex held; take over ownerrship of data. */
241static int __must_check
242__ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len);
243static int __must_check
244__ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len);
245
246
247/* The function structure ***************************************************/
248
249struct ffs_ep;
250
251struct ffs_function {
252 struct usb_configuration *conf;
253 struct usb_gadget *gadget;
254 struct ffs_data *ffs;
255
256 struct ffs_ep *eps;
257 u8 eps_revmap[16];
258 short *interfaces_nums;
259
260 struct usb_function function;
261};
262
263
264static struct ffs_function *ffs_func_from_usb(struct usb_function *f)
265{
266 return container_of(f, struct ffs_function, function);
267}
268
269static void ffs_func_free(struct ffs_function *func);
270
271
272static void ffs_func_eps_disable(struct ffs_function *func);
273static int __must_check ffs_func_eps_enable(struct ffs_function *func);
274
275
276static int ffs_func_bind(struct usb_configuration *,
277 struct usb_function *);
278static void ffs_func_unbind(struct usb_configuration *,
279 struct usb_function *);
280static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned);
281static void ffs_func_disable(struct usb_function *);
282static int ffs_func_setup(struct usb_function *,
283 const struct usb_ctrlrequest *);
284static void ffs_func_suspend(struct usb_function *);
285static void ffs_func_resume(struct usb_function *);
286
287
288static int ffs_func_revmap_ep(struct ffs_function *func, u8 num);
289static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf);
290
291
292
293/* The endpoints structures *************************************************/
294
295struct ffs_ep {
296 struct usb_ep *ep; /* P: ffs->eps_lock */
297 struct usb_request *req; /* P: epfile->mutex */
298
299 /* [0]: full speed, [1]: high speed */
300 struct usb_endpoint_descriptor *descs[2];
301
302 u8 num;
303
304 int status; /* P: epfile->mutex */
305};
306
307struct ffs_epfile {
308 /* Protects ep->ep and ep->req. */
309 struct mutex mutex;
310 wait_queue_head_t wait;
311
312 struct ffs_data *ffs;
313 struct ffs_ep *ep; /* P: ffs->eps_lock */
314
315 struct dentry *dentry;
316
317 char name[5];
318
319 unsigned char in; /* P: ffs->eps_lock */
320 unsigned char isoc; /* P: ffs->eps_lock */
321
322 unsigned char _pad;
323};
324
325
326static int __must_check ffs_epfiles_create(struct ffs_data *ffs);
327static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count);
328
329static struct inode *__must_check
330ffs_sb_create_file(struct super_block *sb, const char *name, void *data,
331 const struct file_operations *fops,
332 struct dentry **dentry_p);
333
334
335/* Misc helper functions ****************************************************/
336
337static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock)
338 __attribute__((warn_unused_result, nonnull));
339static char *ffs_prepare_buffer(const char * __user buf, size_t len)
340 __attribute__((warn_unused_result, nonnull));
341
342
343/* Control file aka ep0 *****************************************************/
344
345static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req)
346{
347 struct ffs_data *ffs = req->context;
348
349 complete_all(&ffs->ep0req_completion);
350}
351
352
353static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len)
354{
355 struct usb_request *req = ffs->ep0req;
356 int ret;
357
358 req->zero = len < le16_to_cpu(ffs->ev.setup.wLength);
359
360 spin_unlock_irq(&ffs->ev.waitq.lock);
361
362 req->buf = data;
363 req->length = len;
364
365 INIT_COMPLETION(ffs->ep0req_completion);
366
367 ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC);
368 if (unlikely(ret < 0))
369 return ret;
370
371 ret = wait_for_completion_interruptible(&ffs->ep0req_completion);
372 if (unlikely(ret)) {
373 usb_ep_dequeue(ffs->gadget->ep0, req);
374 return -EINTR;
375 }
376
377 ffs->setup_state = FFS_NO_SETUP;
378 return ffs->ep0req_status;
379}
380
381static int __ffs_ep0_stall(struct ffs_data *ffs)
382{
383 if (ffs->ev.can_stall) {
384 FVDBG("ep0 stall\n");
385 usb_ep_set_halt(ffs->gadget->ep0);
386 ffs->setup_state = FFS_NO_SETUP;
387 return -EL2HLT;
388 } else {
389 FDBG("bogus ep0 stall!\n");
390 return -ESRCH;
391 }
392}
393
394
395static ssize_t ffs_ep0_write(struct file *file, const char __user *buf,
396 size_t len, loff_t *ptr)
397{
398 struct ffs_data *ffs = file->private_data;
399 ssize_t ret;
400 char *data;
401
402 ENTER();
403
404 /* Fast check if setup was canceled */
405 if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED)
406 return -EIDRM;
407
408 /* Acquire mutex */
409 ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
410 if (unlikely(ret < 0))
411 return ret;
412
413
414 /* Check state */
415 switch (ffs->state) {
416 case FFS_READ_DESCRIPTORS:
417 case FFS_READ_STRINGS:
418 /* Copy data */
419 if (unlikely(len < 16)) {
420 ret = -EINVAL;
421 break;
422 }
423
424 data = ffs_prepare_buffer(buf, len);
425 if (unlikely(IS_ERR(data))) {
426 ret = PTR_ERR(data);
427 break;
428 }
429
430 /* Handle data */
431 if (ffs->state == FFS_READ_DESCRIPTORS) {
432 FINFO("read descriptors");
433 ret = __ffs_data_got_descs(ffs, data, len);
434 if (unlikely(ret < 0))
435 break;
436
437 ffs->state = FFS_READ_STRINGS;
438 ret = len;
439 } else {
440 FINFO("read strings");
441 ret = __ffs_data_got_strings(ffs, data, len);
442 if (unlikely(ret < 0))
443 break;
444
445 ret = ffs_epfiles_create(ffs);
446 if (unlikely(ret)) {
447 ffs->state = FFS_CLOSING;
448 break;
449 }
450
451 ffs->state = FFS_ACTIVE;
452 mutex_unlock(&ffs->mutex);
453
454 ret = functionfs_ready_callback(ffs);
455 if (unlikely(ret < 0)) {
456 ffs->state = FFS_CLOSING;
457 return ret;
458 }
459
460 set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags);
461 return len;
462 }
463 break;
464
465
466 case FFS_ACTIVE:
467 data = NULL;
468 /* We're called from user space, we can use _irq
469 * rather then _irqsave */
470 spin_lock_irq(&ffs->ev.waitq.lock);
471 switch (FFS_SETUP_STATE(ffs)) {
472 case FFS_SETUP_CANCELED:
473 ret = -EIDRM;
474 goto done_spin;
475
476 case FFS_NO_SETUP:
477 ret = -ESRCH;
478 goto done_spin;
479
480 case FFS_SETUP_PENDING:
481 break;
482 }
483
484 /* FFS_SETUP_PENDING */
485 if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) {
486 spin_unlock_irq(&ffs->ev.waitq.lock);
487 ret = __ffs_ep0_stall(ffs);
488 break;
489 }
490
491 /* FFS_SETUP_PENDING and not stall */
492 len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength));
493
494 spin_unlock_irq(&ffs->ev.waitq.lock);
495
496 data = ffs_prepare_buffer(buf, len);
497 if (unlikely(IS_ERR(data))) {
498 ret = PTR_ERR(data);
499 break;
500 }
501
502 spin_lock_irq(&ffs->ev.waitq.lock);
503
504 /* We are guaranteed to be still in FFS_ACTIVE state
505 * but the state of setup could have changed from
506 * FFS_SETUP_PENDING to FFS_SETUP_CANCELED so we need
507 * to check for that. If that happened we copied data
508 * from user space in vain but it's unlikely. */
509 /* For sure we are not in FFS_NO_SETUP since this is
510 * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP
511 * transition can be performed and it's protected by
512 * mutex. */
513
514 if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) {
515 ret = -EIDRM;
516done_spin:
517 spin_unlock_irq(&ffs->ev.waitq.lock);
518 } else {
519 /* unlocks spinlock */
520 ret = __ffs_ep0_queue_wait(ffs, data, len);
521 }
522 kfree(data);
523 break;
524
525
526 default:
527 ret = -EBADFD;
528 break;
529 }
530
531
532 mutex_unlock(&ffs->mutex);
533 return ret;
534}
535
536
537
538static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf,
539 size_t n)
540{
541 /* We are holding ffs->ev.waitq.lock and ffs->mutex and we need
542 * to release them. */
543
544 struct usb_functionfs_event events[n];
545 unsigned i = 0;
546
547 memset(events, 0, sizeof events);
548
549 do {
550 events[i].type = ffs->ev.types[i];
551 if (events[i].type == FUNCTIONFS_SETUP) {
552 events[i].u.setup = ffs->ev.setup;
553 ffs->setup_state = FFS_SETUP_PENDING;
554 }
555 } while (++i < n);
556
557 if (n < ffs->ev.count) {
558 ffs->ev.count -= n;
559 memmove(ffs->ev.types, ffs->ev.types + n,
560 ffs->ev.count * sizeof *ffs->ev.types);
561 } else {
562 ffs->ev.count = 0;
563 }
564
565 spin_unlock_irq(&ffs->ev.waitq.lock);
566 mutex_unlock(&ffs->mutex);
567
568 return unlikely(__copy_to_user(buf, events, sizeof events))
569 ? -EFAULT : sizeof events;
570}
571
572
573static ssize_t ffs_ep0_read(struct file *file, char __user *buf,
574 size_t len, loff_t *ptr)
575{
576 struct ffs_data *ffs = file->private_data;
577 char *data = NULL;
578 size_t n;
579 int ret;
580
581 ENTER();
582
583 /* Fast check if setup was canceled */
584 if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED)
585 return -EIDRM;
586
587 /* Acquire mutex */
588 ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
589 if (unlikely(ret < 0))
590 return ret;
591
592
593 /* Check state */
594 if (ffs->state != FFS_ACTIVE) {
595 ret = -EBADFD;
596 goto done_mutex;
597 }
598
599
600 /* We're called from user space, we can use _irq rather then
601 * _irqsave */
602 spin_lock_irq(&ffs->ev.waitq.lock);
603
604 switch (FFS_SETUP_STATE(ffs)) {
605 case FFS_SETUP_CANCELED:
606 ret = -EIDRM;
607 break;
608
609 case FFS_NO_SETUP:
610 n = len / sizeof(struct usb_functionfs_event);
611 if (unlikely(!n)) {
612 ret = -EINVAL;
613 break;
614 }
615
616 if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) {
617 ret = -EAGAIN;
618 break;
619 }
620
621 if (unlikely(wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, ffs->ev.count))) {
622 ret = -EINTR;
623 break;
624 }
625
626 return __ffs_ep0_read_events(ffs, buf,
627 min(n, (size_t)ffs->ev.count));
628
629
630 case FFS_SETUP_PENDING:
631 if (ffs->ev.setup.bRequestType & USB_DIR_IN) {
632 spin_unlock_irq(&ffs->ev.waitq.lock);
633 ret = __ffs_ep0_stall(ffs);
634 goto done_mutex;
635 }
636
637 len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength));
638
639 spin_unlock_irq(&ffs->ev.waitq.lock);
640
641 if (likely(len)) {
642 data = kmalloc(len, GFP_KERNEL);
643 if (unlikely(!data)) {
644 ret = -ENOMEM;
645 goto done_mutex;
646 }
647 }
648
649 spin_lock_irq(&ffs->ev.waitq.lock);
650
651 /* See ffs_ep0_write() */
652 if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) {
653 ret = -EIDRM;
654 break;
655 }
656
657 /* unlocks spinlock */
658 ret = __ffs_ep0_queue_wait(ffs, data, len);
659 if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len)))
660 ret = -EFAULT;
661 goto done_mutex;
662
663 default:
664 ret = -EBADFD;
665 break;
666 }
667
668 spin_unlock_irq(&ffs->ev.waitq.lock);
669done_mutex:
670 mutex_unlock(&ffs->mutex);
671 kfree(data);
672 return ret;
673}
674
675
676
677static int ffs_ep0_open(struct inode *inode, struct file *file)
678{
679 struct ffs_data *ffs = inode->i_private;
680
681 ENTER();
682
683 if (unlikely(ffs->state == FFS_CLOSING))
684 return -EBUSY;
685
686 file->private_data = ffs;
687 ffs_data_opened(ffs);
688
689 return 0;
690}
691
692
693static int ffs_ep0_release(struct inode *inode, struct file *file)
694{
695 struct ffs_data *ffs = file->private_data;
696
697 ENTER();
698
699 ffs_data_closed(ffs);
700
701 return 0;
702}
703
704
705static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value)
706{
707 struct ffs_data *ffs = file->private_data;
708 struct usb_gadget *gadget = ffs->gadget;
709 long ret;
710
711 ENTER();
712
713 if (code == FUNCTIONFS_INTERFACE_REVMAP) {
714 struct ffs_function *func = ffs->func;
715 ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV;
716 } else if (gadget->ops->ioctl) {
ddf8abd2 717 ret = gadget->ops->ioctl(gadget, code, value);
ddf8abd2
MN		 718 } else {
719 ret = -ENOTTY;
720 }
721
722 return ret;
723}
724
725
726static const struct file_operations ffs_ep0_operations = {
727 .owner = THIS_MODULE,
728 .llseek = no_llseek,
729
730 .open = ffs_ep0_open,
731 .write = ffs_ep0_write,
732 .read = ffs_ep0_read,
733 .release = ffs_ep0_release,
734 .unlocked_ioctl = ffs_ep0_ioctl,
735};
736
737
738/* "Normal" endpoints operations ********************************************/
739
740
741static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req)
742{
743 ENTER();
744 if (likely(req->context)) {
745 struct ffs_ep *ep = _ep->driver_data;
746 ep->status = req->status ? req->status : req->actual;
747 complete(req->context);
748 }
749}
750
751
752static ssize_t ffs_epfile_io(struct file *file,
753 char __user *buf, size_t len, int read)
754{
755 struct ffs_epfile *epfile = file->private_data;
756 struct ffs_ep *ep;
757 char *data = NULL;
758 ssize_t ret;
759 int halt;
760
761 goto first_try;
762 do {
763 spin_unlock_irq(&epfile->ffs->eps_lock);
764 mutex_unlock(&epfile->mutex);
765
766first_try:
767 /* Are we still active? */
768 if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) {
769 ret = -ENODEV;
770 goto error;
771 }
772
773 /* Wait for endpoint to be enabled */
774 ep = epfile->ep;
775 if (!ep) {
776 if (file->f_flags & O_NONBLOCK) {
777 ret = -EAGAIN;
778 goto error;
779 }
780
781 if (unlikely(wait_event_interruptible
782 (epfile->wait, (ep = epfile->ep)))) {
783 ret = -EINTR;
784 goto error;
785 }
786 }
787
788 /* Do we halt? */
789 halt = !read == !epfile->in;
790 if (halt && epfile->isoc) {
791 ret = -EINVAL;
792 goto error;
793 }
794
795 /* Allocate & copy */
796 if (!halt && !data) {
797 data = kzalloc(len, GFP_KERNEL);
798 if (unlikely(!data))
799 return -ENOMEM;
800
801 if (!read &&
802 unlikely(__copy_from_user(data, buf, len))) {
803 ret = -EFAULT;
804 goto error;
805 }
806 }
807
808 /* We will be using request */
809 ret = ffs_mutex_lock(&epfile->mutex,
810 file->f_flags & O_NONBLOCK);
811 if (unlikely(ret))
812 goto error;
813
814 /* We're called from user space, we can use _irq rather then
815 * _irqsave */
816 spin_lock_irq(&epfile->ffs->eps_lock);
817
818 /* While we were acquiring mutex endpoint got disabled
819 * or changed? */
820 } while (unlikely(epfile->ep != ep));
821
822 /* Halt */
823 if (unlikely(halt)) {
824 if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep))
825 usb_ep_set_halt(ep->ep);
826 spin_unlock_irq(&epfile->ffs->eps_lock);
827 ret = -EBADMSG;
828 } else {
829 /* Fire the request */
830 DECLARE_COMPLETION_ONSTACK(done);
831
832 struct usb_request *req = ep->req;
833 req->context = &done;
834 req->complete = ffs_epfile_io_complete;
835 req->buf = data;
836 req->length = len;
837
838 ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC);
839
840 spin_unlock_irq(&epfile->ffs->eps_lock);
841
842 if (unlikely(ret < 0)) {
843 /* nop */
844 } else if (unlikely(wait_for_completion_interruptible(&done))) {
845 ret = -EINTR;
846 usb_ep_dequeue(ep->ep, req);
847 } else {
848 ret = ep->status;
849 if (read && ret > 0 &&
850 unlikely(copy_to_user(buf, data, ret)))
851 ret = -EFAULT;
852 }
853 }
854
855 mutex_unlock(&epfile->mutex);
856error:
857 kfree(data);
858 return ret;
859}
860
861
862static ssize_t
863ffs_epfile_write(struct file *file, const char __user *buf, size_t len,
864 loff_t *ptr)
865{
866 ENTER();
867
868 return ffs_epfile_io(file, (char __user *)buf, len, 0);
869}
870
871static ssize_t
872ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr)
873{
874 ENTER();
875
876 return ffs_epfile_io(file, buf, len, 1);
877}
878
879static int
880ffs_epfile_open(struct inode *inode, struct file *file)
881{
882 struct ffs_epfile *epfile = inode->i_private;
883
884 ENTER();
885
886 if (WARN_ON(epfile->ffs->state != FFS_ACTIVE))
887 return -ENODEV;
888
889 file->private_data = epfile;
890 ffs_data_opened(epfile->ffs);
891
892 return 0;
893}
894
895static int
896ffs_epfile_release(struct inode *inode, struct file *file)
897{
898 struct ffs_epfile *epfile = inode->i_private;
899
900 ENTER();
901
902 ffs_data_closed(epfile->ffs);
903
904 return 0;
905}
906
907
908static long ffs_epfile_ioctl(struct file *file, unsigned code,
909 unsigned long value)
910{
911 struct ffs_epfile *epfile = file->private_data;
912 int ret;
913
914 ENTER();
915
916 if (WARN_ON(epfile->ffs->state != FFS_ACTIVE))
917 return -ENODEV;
918
919 spin_lock_irq(&epfile->ffs->eps_lock);
920 if (likely(epfile->ep)) {
921 switch (code) {
922 case FUNCTIONFS_FIFO_STATUS:
923 ret = usb_ep_fifo_status(epfile->ep->ep);
924 break;
925 case FUNCTIONFS_FIFO_FLUSH:
926 usb_ep_fifo_flush(epfile->ep->ep);
927 ret = 0;
928 break;
929 case FUNCTIONFS_CLEAR_HALT:
930 ret = usb_ep_clear_halt(epfile->ep->ep);
931 break;
932 case FUNCTIONFS_ENDPOINT_REVMAP:
933 ret = epfile->ep->num;
934 break;
935 default:
936 ret = -ENOTTY;
937 }
938 } else {
939 ret = -ENODEV;
940 }
941 spin_unlock_irq(&epfile->ffs->eps_lock);
942
943 return ret;
944}
945
946
947static const struct file_operations ffs_epfile_operations = {
948 .owner = THIS_MODULE,
949 .llseek = no_llseek,
950
951 .open = ffs_epfile_open,
952 .write = ffs_epfile_write,
953 .read = ffs_epfile_read,
954 .release = ffs_epfile_release,
955 .unlocked_ioctl = ffs_epfile_ioctl,
956};
957
958
959
960/* File system and super block operations ***********************************/
961
962/*
963 * Mounting the filesystem creates a controller file, used first for
964 * function configuration then later for event monitoring.
965 */
966
967
968static struct inode *__must_check
969ffs_sb_make_inode(struct super_block *sb, void *data,
970 const struct file_operations *fops,
971 const struct inode_operations *iops,
972 struct ffs_file_perms *perms)
973{
974 struct inode *inode;
975
976 ENTER();
977
978 inode = new_inode(sb);
979
980 if (likely(inode)) {
981 struct timespec current_time = CURRENT_TIME;
982
12ba8d1e 983 inode->i_ino = get_next_ino();
ddf8abd2
MN		 984 inode->i_mode = perms->mode;
985 inode->i_uid = perms->uid;
986 inode->i_gid = perms->gid;
987 inode->i_atime = current_time;
988 inode->i_mtime = current_time;
989 inode->i_ctime = current_time;
990 inode->i_private = data;
991 if (fops)
992 inode->i_fop = fops;
993 if (iops)
994 inode->i_op = iops;
995 }
996
997 return inode;
998}
999
1000
1001/* Create "regular" file */
1002
1003static struct inode *ffs_sb_create_file(struct super_block *sb,
1004 const char *name, void *data,
1005 const struct file_operations *fops,
1006 struct dentry **dentry_p)
1007{
1008 struct ffs_data *ffs = sb->s_fs_info;
1009 struct dentry *dentry;
1010 struct inode *inode;
1011
1012 ENTER();
1013
1014 dentry = d_alloc_name(sb->s_root, name);
1015 if (unlikely(!dentry))
1016 return NULL;
1017
1018 inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms);
1019 if (unlikely(!inode)) {
1020 dput(dentry);
1021 return NULL;
1022 }
1023
1024 d_add(dentry, inode);
1025 if (dentry_p)
1026 *dentry_p = dentry;
1027
1028 return inode;
1029}
1030
1031
1032/* Super block */
1033
1034static const struct super_operations ffs_sb_operations = {
1035 .statfs = simple_statfs,
1036 .drop_inode = generic_delete_inode,
1037};
1038
1039struct ffs_sb_fill_data {
1040 struct ffs_file_perms perms;
1041 umode_t root_mode;
1042 const char *dev_name;
1043};
1044
1045static int ffs_sb_fill(struct super_block *sb, void *_data, int silent)
1046{
1047 struct ffs_sb_fill_data *data = _data;
1048 struct inode *inode;
1049 struct dentry *d;
1050 struct ffs_data *ffs;
1051
1052 ENTER();
1053
1054 /* Initialize data */
1055 ffs = ffs_data_new();
1056 if (unlikely(!ffs))
1057 goto enomem0;
1058
1059 ffs->sb = sb;
1060 ffs->dev_name = data->dev_name;
1061 ffs->file_perms = data->perms;
1062
1063 sb->s_fs_info = ffs;
1064 sb->s_blocksize = PAGE_CACHE_SIZE;
1065 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1066 sb->s_magic = FUNCTIONFS_MAGIC;
1067 sb->s_op = &ffs_sb_operations;
1068 sb->s_time_gran = 1;
1069
1070 /* Root inode */
1071 data->perms.mode = data->root_mode;
1072 inode = ffs_sb_make_inode(sb, NULL,
1073 &simple_dir_operations,
1074 &simple_dir_inode_operations,
1075 &data->perms);
1076 if (unlikely(!inode))
1077 goto enomem1;
1078 d = d_alloc_root(inode);
1079 if (unlikely(!d))
1080 goto enomem2;
1081 sb->s_root = d;
1082
1083 /* EP0 file */
1084 if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs,
1085 &ffs_ep0_operations, NULL)))
1086 goto enomem3;
1087
1088 return 0;
1089
1090enomem3:
1091 dput(d);
1092enomem2:
1093 iput(inode);
1094enomem1:
1095 ffs_data_put(ffs);
1096enomem0:
1097 return -ENOMEM;
1098}
1099
1100
1101static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts)
1102{
1103 ENTER();
1104
1105 if (!opts || !*opts)
1106 return 0;
1107
1108 for (;;) {
1109 char *end, *eq, *comma;
1110 unsigned long value;
1111
1112 /* Option limit */
1113 comma = strchr(opts, ',');
1114 if (comma)
1115 *comma = 0;
1116
1117 /* Value limit */
1118 eq = strchr(opts, '=');
1119 if (unlikely(!eq)) {
1120 FERR("'=' missing in %s", opts);
1121 return -EINVAL;
1122 }
1123 *eq = 0;
1124
1125 /* Parse value */
1126 value = simple_strtoul(eq + 1, &end, 0);
1127 if (unlikely(*end != ',' && *end != 0)) {
1128 FERR("%s: invalid value: %s", opts, eq + 1);
1129 return -EINVAL;
1130 }
1131
1132 /* Interpret option */
1133 switch (eq - opts) {
1134 case 5:
1135 if (!memcmp(opts, "rmode", 5))
1136 data->root_mode = (value & 0555) | S_IFDIR;
1137 else if (!memcmp(opts, "fmode", 5))
1138 data->perms.mode = (value & 0666) | S_IFREG;
1139 else
1140 goto invalid;
1141 break;
1142
1143 case 4:
1144 if (!memcmp(opts, "mode", 4)) {
1145 data->root_mode = (value & 0555) | S_IFDIR;
1146 data->perms.mode = (value & 0666) | S_IFREG;
1147 } else {
1148 goto invalid;
1149 }
1150 break;
1151
1152 case 3:
1153 if (!memcmp(opts, "uid", 3))
1154 data->perms.uid = value;
1155 else if (!memcmp(opts, "gid", 3))
1156 data->perms.gid = value;
1157 else
1158 goto invalid;
1159 break;
1160
1161 default:
1162invalid:
1163 FERR("%s: invalid option", opts);
1164 return -EINVAL;
1165 }
1166
1167 /* Next iteration */
1168 if (!comma)
1169 break;
1170 opts = comma + 1;
1171 }
1172
1173 return 0;
1174}
1175
1176
1177/* "mount -t functionfs dev_name /dev/function" ends up here */
1178
fc14f2fe
AV		 1179static struct dentry *
1180ffs_fs_mount(struct file_system_type *t, int flags,
1181 const char *dev_name, void *opts)
ddf8abd2
MN		 1182{
1183 struct ffs_sb_fill_data data = {
1184 .perms = {
1185 .mode = S_IFREG | 0600,
1186 .uid = 0,
1187 .gid = 0
1188 },
1189 .root_mode = S_IFDIR | 0500,
1190 };
1191 int ret;
1192
1193 ENTER();
1194
1195 ret = functionfs_check_dev_callback(dev_name);
1196 if (unlikely(ret < 0))
fc14f2fe 1197 return ERR_PTR(ret);
ddf8abd2
MN		 1198
1199 ret = ffs_fs_parse_opts(&data, opts);
1200 if (unlikely(ret < 0))
fc14f2fe 1201 return ERR_PTR(ret);
ddf8abd2
MN		 1202
1203 data.dev_name = dev_name;
fc14f2fe 1204 return mount_single(t, flags, &data, ffs_sb_fill);
ddf8abd2
MN		 1205}
1206
1207static void
1208ffs_fs_kill_sb(struct super_block *sb)
1209{
1210 void *ptr;
1211
1212 ENTER();
1213
1214 kill_litter_super(sb);
1215 ptr = xchg(&sb->s_fs_info, NULL);
1216 if (ptr)
1217 ffs_data_put(ptr);
1218}
1219
1220static struct file_system_type ffs_fs_type = {
1221 .owner = THIS_MODULE,
1222 .name = "functionfs",
fc14f2fe 1223 .mount = ffs_fs_mount,
ddf8abd2
MN		 1224 .kill_sb = ffs_fs_kill_sb,
1225};
1226
1227
1228
1229/* Driver's main init/cleanup functions *************************************/
1230
1231
1232static int functionfs_init(void)
1233{
1234 int ret;
1235
1236 ENTER();
1237
1238 ret = register_filesystem(&ffs_fs_type);
1239 if (likely(!ret))
1240 FINFO("file system registered");
1241 else
1242 FERR("failed registering file system (%d)", ret);
1243
1244 return ret;
1245}
1246
1247static void functionfs_cleanup(void)
1248{
1249 ENTER();
1250
1251 FINFO("unloading");
1252 unregister_filesystem(&ffs_fs_type);
1253}
1254
1255
1256
1257/* ffs_data and ffs_function construction and destruction code **************/
1258
1259static void ffs_data_clear(struct ffs_data *ffs);
1260static void ffs_data_reset(struct ffs_data *ffs);
1261
1262
1263static void ffs_data_get(struct ffs_data *ffs)
1264{
1265 ENTER();
1266
1267 atomic_inc(&ffs->ref);
1268}
1269
1270static void ffs_data_opened(struct ffs_data *ffs)
1271{
1272 ENTER();
1273
1274 atomic_inc(&ffs->ref);
1275 atomic_inc(&ffs->opened);
1276}
1277
1278static void ffs_data_put(struct ffs_data *ffs)
1279{
1280 ENTER();
1281
1282 if (unlikely(atomic_dec_and_test(&ffs->ref))) {
1283 FINFO("%s(): freeing", __func__);
1284 ffs_data_clear(ffs);
1285 BUG_ON(mutex_is_locked(&ffs->mutex) ||
1286 spin_is_locked(&ffs->ev.waitq.lock) ||
1287 waitqueue_active(&ffs->ev.waitq) ||
1288 waitqueue_active(&ffs->ep0req_completion.wait));
1289 kfree(ffs);
1290 }
1291}
1292
1293
1294
1295static void ffs_data_closed(struct ffs_data *ffs)
1296{
1297 ENTER();
1298
1299 if (atomic_dec_and_test(&ffs->opened)) {
1300 ffs->state = FFS_CLOSING;
1301 ffs_data_reset(ffs);
1302 }
1303
1304 ffs_data_put(ffs);
1305}
1306
1307
1308static struct ffs_data *ffs_data_new(void)
1309{
1310 struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL);
1311 if (unlikely(!ffs))
1312 return 0;
1313
1314 ENTER();
1315
1316 atomic_set(&ffs->ref, 1);
1317 atomic_set(&ffs->opened, 0);
1318 ffs->state = FFS_READ_DESCRIPTORS;
1319 mutex_init(&ffs->mutex);
1320 spin_lock_init(&ffs->eps_lock);
1321 init_waitqueue_head(&ffs->ev.waitq);
1322 init_completion(&ffs->ep0req_completion);
1323
1324 /* XXX REVISIT need to update it in some places, or do we? */
1325 ffs->ev.can_stall = 1;
1326
1327 return ffs;
1328}
1329
1330
1331static void ffs_data_clear(struct ffs_data *ffs)
1332{
1333 ENTER();
1334
1335 if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags))
1336 functionfs_closed_callback(ffs);
1337
1338 BUG_ON(ffs->gadget);
1339
1340 if (ffs->epfiles)
1341 ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count);
1342
1343 kfree(ffs->raw_descs);
1344 kfree(ffs->raw_strings);
1345 kfree(ffs->stringtabs);
1346}
1347
1348
1349static void ffs_data_reset(struct ffs_data *ffs)
1350{
1351 ENTER();
1352
1353 ffs_data_clear(ffs);
1354
1355 ffs->epfiles = NULL;
1356 ffs->raw_descs = NULL;
1357 ffs->raw_strings = NULL;
1358 ffs->stringtabs = NULL;
1359
1360 ffs->raw_descs_length = 0;
1361 ffs->raw_fs_descs_length = 0;
1362 ffs->fs_descs_count = 0;
1363 ffs->hs_descs_count = 0;
1364
1365 ffs->strings_count = 0;
1366 ffs->interfaces_count = 0;
1367 ffs->eps_count = 0;
1368
1369 ffs->ev.count = 0;
1370
1371 ffs->state = FFS_READ_DESCRIPTORS;
1372 ffs->setup_state = FFS_NO_SETUP;
1373 ffs->flags = 0;
1374}
1375
1376
1377static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev)
1378{
fd7c9a00
MN		 1379 struct usb_gadget_strings **lang;
1380 int first_id;
ddf8abd2
MN		 1381
1382 ENTER();
1383
1384 if (WARN_ON(ffs->state != FFS_ACTIVE
1385 || test_and_set_bit(FFS_FL_BOUND, &ffs->flags)))
1386 return -EBADFD;
1387
fd7c9a00
MN		 1388 first_id = usb_string_ids_n(cdev, ffs->strings_count);
1389 if (unlikely(first_id < 0))
1390 return first_id;
ddf8abd2
MN		 1391
1392 ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
1393 if (unlikely(!ffs->ep0req))
1394 return -ENOMEM;
1395 ffs->ep0req->complete = ffs_ep0_complete;
1396 ffs->ep0req->context = ffs;
1397
fd7c9a00
MN		 1398 lang = ffs->stringtabs;
1399 for (lang = ffs->stringtabs; *lang; ++lang) {
1400 struct usb_string *str = (*lang)->strings;
1401 int id = first_id;
1402 for (; str->s; ++id, ++str)
1403 str->id = id;
ddf8abd2
MN		 1404 }
1405
1406 ffs->gadget = cdev->gadget;
fd7c9a00 1407 ffs_data_get(ffs);
ddf8abd2
MN		 1408 return 0;
1409}
1410
1411
1412static void functionfs_unbind(struct ffs_data *ffs)
1413{
1414 ENTER();
1415
1416 if (!WARN_ON(!ffs->gadget)) {
1417 usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req);
1418 ffs->ep0req = NULL;
1419 ffs->gadget = NULL;
1420 ffs_data_put(ffs);
1421 }
1422}
1423
1424
1425static int ffs_epfiles_create(struct ffs_data *ffs)
1426{
1427 struct ffs_epfile *epfile, *epfiles;
1428 unsigned i, count;
1429
1430 ENTER();
1431
1432 count = ffs->eps_count;
1433 epfiles = kzalloc(count * sizeof *epfiles, GFP_KERNEL);
1434 if (!epfiles)
1435 return -ENOMEM;
1436
1437 epfile = epfiles;
1438 for (i = 1; i <= count; ++i, ++epfile) {
1439 epfile->ffs = ffs;
1440 mutex_init(&epfile->mutex);
1441 init_waitqueue_head(&epfile->wait);
1442 sprintf(epfiles->name, "ep%u", i);
1443 if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile,
1444 &ffs_epfile_operations,
1445 &epfile->dentry))) {
1446 ffs_epfiles_destroy(epfiles, i - 1);
1447 return -ENOMEM;
1448 }
1449 }
1450
1451 ffs->epfiles = epfiles;
1452 return 0;
1453}
1454
1455
1456static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count)
1457{
1458 struct ffs_epfile *epfile = epfiles;
1459
1460 ENTER();
1461
1462 for (; count; --count, ++epfile) {
1463 BUG_ON(mutex_is_locked(&epfile->mutex) ||
1464 waitqueue_active(&epfile->wait));
1465 if (epfile->dentry) {
1466 d_delete(epfile->dentry);
1467 dput(epfile->dentry);
1468 epfile->dentry = NULL;
1469 }
1470 }
1471
1472 kfree(epfiles);
1473}
1474
1475
7898aee1
MN		 1476static int functionfs_bind_config(struct usb_composite_dev *cdev,
1477 struct usb_configuration *c,
1478 struct ffs_data *ffs)
ddf8abd2
MN		 1479{
1480 struct ffs_function *func;
1481 int ret;
1482
1483 ENTER();
1484
1485 func = kzalloc(sizeof *func, GFP_KERNEL);
1486 if (unlikely(!func))
1487 return -ENOMEM;
1488
1489 func->function.name = "Function FS Gadget";
1490 func->function.strings = ffs->stringtabs;
1491
1492 func->function.bind = ffs_func_bind;
1493 func->function.unbind = ffs_func_unbind;
1494 func->function.set_alt = ffs_func_set_alt;
1495 /*func->function.get_alt = ffs_func_get_alt;*/
1496 func->function.disable = ffs_func_disable;
1497 func->function.setup = ffs_func_setup;
1498 func->function.suspend = ffs_func_suspend;
1499 func->function.resume = ffs_func_resume;
1500
1501 func->conf = c;
1502 func->gadget = cdev->gadget;
1503 func->ffs = ffs;
1504 ffs_data_get(ffs);
1505
1506 ret = usb_add_function(c, &func->function);
1507 if (unlikely(ret))
1508 ffs_func_free(func);
1509
1510 return ret;
1511}
1512
1513static void ffs_func_free(struct ffs_function *func)
1514{
1515 ENTER();
1516
1517 ffs_data_put(func->ffs);
1518
1519 kfree(func->eps);
1520 /* eps and interfaces_nums are allocated in the same chunk so
1521 * only one free is required. Descriptors are also allocated
1522 * in the same chunk. */
1523
1524 kfree(func);
1525}
1526
1527
1528static void ffs_func_eps_disable(struct ffs_function *func)
1529{
1530 struct ffs_ep *ep = func->eps;
1531 struct ffs_epfile *epfile = func->ffs->epfiles;
1532 unsigned count = func->ffs->eps_count;
1533 unsigned long flags;
1534
1535 spin_lock_irqsave(&func->ffs->eps_lock, flags);
1536 do {
1537 /* pending requests get nuked */
1538 if (likely(ep->ep))
1539 usb_ep_disable(ep->ep);
1540 epfile->ep = NULL;
1541
1542 ++ep;
1543 ++epfile;
1544 } while (--count);
1545 spin_unlock_irqrestore(&func->ffs->eps_lock, flags);
1546}
1547
1548static int ffs_func_eps_enable(struct ffs_function *func)
1549{
1550 struct ffs_data *ffs = func->ffs;
1551 struct ffs_ep *ep = func->eps;
1552 struct ffs_epfile *epfile = ffs->epfiles;
1553 unsigned count = ffs->eps_count;
1554 unsigned long flags;
1555 int ret = 0;
1556
1557 spin_lock_irqsave(&func->ffs->eps_lock, flags);
1558 do {
1559 struct usb_endpoint_descriptor *ds;
1560 ds = ep->descs[ep->descs[1] ? 1 : 0];
1561
1562 ep->ep->driver_data = ep;
1563 ret = usb_ep_enable(ep->ep, ds);
1564 if (likely(!ret)) {
1565 epfile->ep = ep;
1566 epfile->in = usb_endpoint_dir_in(ds);
1567 epfile->isoc = usb_endpoint_xfer_isoc(ds);
1568 } else {
1569 break;
1570 }
1571
1572 wake_up(&epfile->wait);
1573
1574 ++ep;
1575 ++epfile;
1576 } while (--count);
1577 spin_unlock_irqrestore(&func->ffs->eps_lock, flags);
1578
1579 return ret;
1580}
1581
1582
1583/* Parsing and building descriptors and strings *****************************/
1584
1585
1586/* This validates if data pointed by data is a valid USB descriptor as
1587 * well as record how many interfaces, endpoints and strings are
1588 * required by given configuration. Returns address afther the
1589 * descriptor or NULL if data is invalid. */
1590
1591enum ffs_entity_type {
1592 FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT
1593};
1594
1595typedef int (*ffs_entity_callback)(enum ffs_entity_type entity,
1596 u8 *valuep,
1597 struct usb_descriptor_header *desc,
1598 void *priv);
1599
1600static int __must_check ffs_do_desc(char *data, unsigned len,
1601 ffs_entity_callback entity, void *priv)
1602{
1603 struct usb_descriptor_header *_ds = (void *)data;
1604 u8 length;
1605 int ret;
1606
1607 ENTER();
1608
1609 /* At least two bytes are required: length and type */
1610 if (len < 2) {
1611 FVDBG("descriptor too short");
1612 return -EINVAL;
1613 }
1614
1615 /* If we have at least as many bytes as the descriptor takes? */
1616 length = _ds->bLength;
1617 if (len < length) {
1618 FVDBG("descriptor longer then available data");
1619 return -EINVAL;
1620 }
1621
1622#define __entity_check_INTERFACE(val) 1
1623#define __entity_check_STRING(val) (val)
1624#define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK)
1625#define __entity(type, val) do { \
1626 FVDBG("entity " #type "(%02x)", (val)); \
1627 if (unlikely(!__entity_check_ ##type(val))) { \
1628 FVDBG("invalid entity's value"); \
1629 return -EINVAL; \
1630 } \
1631 ret = entity(FFS_ ##type, &val, _ds, priv); \
1632 if (unlikely(ret < 0)) { \
1633 FDBG("entity " #type "(%02x); ret = %d", \
1634 (val), ret); \
1635 return ret; \
1636 } \
1637 } while (0)
1638
1639 /* Parse descriptor depending on type. */
1640 switch (_ds->bDescriptorType) {
1641 case USB_DT_DEVICE:
1642 case USB_DT_CONFIG:
1643 case USB_DT_STRING:
1644 case USB_DT_DEVICE_QUALIFIER:
1645 /* function can't have any of those */
1646 FVDBG("descriptor reserved for gadget: %d", _ds->bDescriptorType);
1647 return -EINVAL;
1648
1649 case USB_DT_INTERFACE: {
1650 struct usb_interface_descriptor *ds = (void *)_ds;
1651 FVDBG("interface descriptor");
1652 if (length != sizeof *ds)
1653 goto inv_length;
1654
1655 __entity(INTERFACE, ds->bInterfaceNumber);
1656 if (ds->iInterface)
1657 __entity(STRING, ds->iInterface);
1658 }
1659 break;
1660
1661 case USB_DT_ENDPOINT: {
1662 struct usb_endpoint_descriptor *ds = (void *)_ds;
1663 FVDBG("endpoint descriptor");
1664 if (length != USB_DT_ENDPOINT_SIZE &&
1665 length != USB_DT_ENDPOINT_AUDIO_SIZE)
1666 goto inv_length;
1667 __entity(ENDPOINT, ds->bEndpointAddress);
1668 }
1669 break;
1670
1671 case USB_DT_OTG:
1672 if (length != sizeof(struct usb_otg_descriptor))
1673 goto inv_length;
1674 break;
1675
1676 case USB_DT_INTERFACE_ASSOCIATION: {
1677 struct usb_interface_assoc_descriptor *ds = (void *)_ds;
1678 FVDBG("interface association descriptor");
1679 if (length != sizeof *ds)
1680 goto inv_length;
1681 if (ds->iFunction)
1682 __entity(STRING, ds->iFunction);
1683 }
1684 break;
1685
1686 case USB_DT_OTHER_SPEED_CONFIG:
1687 case USB_DT_INTERFACE_POWER:
1688 case USB_DT_DEBUG:
1689 case USB_DT_SECURITY:
1690 case USB_DT_CS_RADIO_CONTROL:
1691 /* TODO */
1692 FVDBG("unimplemented descriptor: %d", _ds->bDescriptorType);
1693 return -EINVAL;
1694
1695 default:
1696 /* We should never be here */
1697 FVDBG("unknown descriptor: %d", _ds->bDescriptorType);
1698 return -EINVAL;
1699
1700 inv_length:
1701 FVDBG("invalid length: %d (descriptor %d)",
1702 _ds->bLength, _ds->bDescriptorType);
1703 return -EINVAL;
1704 }
1705
1706#undef __entity
1707#undef __entity_check_DESCRIPTOR
1708#undef __entity_check_INTERFACE
1709#undef __entity_check_STRING
1710#undef __entity_check_ENDPOINT
1711
1712 return length;
1713}
1714
1715
1716static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len,
1717 ffs_entity_callback entity, void *priv)
1718{
1719 const unsigned _len = len;
1720 unsigned long num = 0;
1721
1722 ENTER();
1723
1724 for (;;) {
1725 int ret;
1726
1727 if (num == count)
1728 data = NULL;
1729
1730 /* Record "descriptor" entitny */
1731 ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv);
1732 if (unlikely(ret < 0)) {
1733 FDBG("entity DESCRIPTOR(%02lx); ret = %d", num, ret);
1734 return ret;
1735 }
1736
1737 if (!data)
1738 return _len - len;
1739
1740 ret = ffs_do_desc(data, len, entity, priv);
1741 if (unlikely(ret < 0)) {
1742 FDBG("%s returns %d", __func__, ret);
1743 return ret;
1744 }
1745
1746 len -= ret;
1747 data += ret;
1748 ++num;
1749 }
1750}
1751
1752
1753static int __ffs_data_do_entity(enum ffs_entity_type type,
1754 u8 *valuep, struct usb_descriptor_header *desc,
1755 void *priv)
1756{
1757 struct ffs_data *ffs = priv;
1758
1759 ENTER();
1760
1761 switch (type) {
1762 case FFS_DESCRIPTOR:
1763 break;
1764
1765 case FFS_INTERFACE:
1766 /* Interfaces are indexed from zero so if we
1767 * encountered interface "n" then there are at least
1768 * "n+1" interfaces. */
1769 if (*valuep >= ffs->interfaces_count)
1770 ffs->interfaces_count = *valuep + 1;
1771 break;
1772
1773 case FFS_STRING:
1774 /* Strings are indexed from 1 (0 is magic ;) reserved
1775 * for languages list or some such) */
1776 if (*valuep > ffs->strings_count)
1777 ffs->strings_count = *valuep;
1778 break;
1779
1780 case FFS_ENDPOINT:
1781 /* Endpoints are indexed from 1 as well. */
1782 if ((*valuep & USB_ENDPOINT_NUMBER_MASK) > ffs->eps_count)
1783 ffs->eps_count = (*valuep & USB_ENDPOINT_NUMBER_MASK);
1784 break;
1785 }
1786
1787 return 0;
1788}
1789
1790
1791static int __ffs_data_got_descs(struct ffs_data *ffs,
1792 char *const _data, size_t len)
1793{
1794 unsigned fs_count, hs_count;
1795 int fs_len, ret = -EINVAL;
1796 char *data = _data;
1797
1798 ENTER();
1799
1800 if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_DESCRIPTORS_MAGIC ||
1801 get_unaligned_le32(data + 4) != len))
1802 goto error;
1803 fs_count = get_unaligned_le32(data + 8);
1804 hs_count = get_unaligned_le32(data + 12);
1805
1806 if (!fs_count && !hs_count)
1807 goto einval;
1808
1809 data += 16;
1810 len -= 16;
1811
1812 if (likely(fs_count)) {
1813 fs_len = ffs_do_descs(fs_count, data, len,
1814 __ffs_data_do_entity, ffs);
1815 if (unlikely(fs_len < 0)) {
1816 ret = fs_len;
1817 goto error;
1818 }
1819
1820 data += fs_len;
1821 len -= fs_len;
1822 } else {
1823 fs_len = 0;
1824 }
1825
1826 if (likely(hs_count)) {
1827 ret = ffs_do_descs(hs_count, data, len,
1828 __ffs_data_do_entity, ffs);
1829 if (unlikely(ret < 0))
1830 goto error;
1831 } else {
1832 ret = 0;
1833 }
1834
1835 if (unlikely(len != ret))
1836 goto einval;
1837
1838 ffs->raw_fs_descs_length = fs_len;
1839 ffs->raw_descs_length = fs_len + ret;
1840 ffs->raw_descs = _data;
1841 ffs->fs_descs_count = fs_count;
1842 ffs->hs_descs_count = hs_count;
1843
1844 return 0;
1845
1846einval:
1847 ret = -EINVAL;
1848error:
1849 kfree(_data);
1850 return ret;
1851}
1852
1853
1854
1855static int __ffs_data_got_strings(struct ffs_data *ffs,
1856 char *const _data, size_t len)
1857{
1858 u32 str_count, needed_count, lang_count;
1859 struct usb_gadget_strings **stringtabs, *t;
1860 struct usb_string *strings, *s;
1861 const char *data = _data;
1862
1863 ENTER();
1864
1865 if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC ||
1866 get_unaligned_le32(data + 4) != len))
1867 goto error;
1868 str_count = get_unaligned_le32(data + 8);
1869 lang_count = get_unaligned_le32(data + 12);
1870
1871 /* if one is zero the other must be zero */
1872 if (unlikely(!str_count != !lang_count))
1873 goto error;
1874
1875 /* Do we have at least as many strings as descriptors need? */
1876 needed_count = ffs->strings_count;
1877 if (unlikely(str_count < needed_count))
1878 goto error;
1879
1880 /* If we don't need any strings just return and free all
1881 * memory */
1882 if (!needed_count) {
1883 kfree(_data);
1884 return 0;
1885 }
1886
1887 /* Allocate */
1888 {
1889 /* Allocate everything in one chunk so there's less
1890 * maintanance. */
1891 struct {
1892 struct usb_gadget_strings *stringtabs[lang_count + 1];
1893 struct usb_gadget_strings stringtab[lang_count];
1894 struct usb_string strings[lang_count*(needed_count+1)];
1895 } *d;
1896 unsigned i = 0;
1897
1898 d = kmalloc(sizeof *d, GFP_KERNEL);
1899 if (unlikely(!d)) {
1900 kfree(_data);
1901 return -ENOMEM;
1902 }
1903
1904 stringtabs = d->stringtabs;
1905 t = d->stringtab;
1906 i = lang_count;
1907 do {
1908 *stringtabs++ = t++;
1909 } while (--i);
1910 *stringtabs = NULL;
1911
1912 stringtabs = d->stringtabs;
1913 t = d->stringtab;
1914 s = d->strings;
1915 strings = s;
1916 }
1917
1918 /* For each language */
1919 data += 16;
1920 len -= 16;
1921
1922 do { /* lang_count > 0 so we can use do-while */
1923 unsigned needed = needed_count;
1924
1925 if (unlikely(len < 3))
1926 goto error_free;
1927 t->language = get_unaligned_le16(data);
1928 t->strings = s;
1929 ++t;
1930
1931 data += 2;
1932 len -= 2;
1933
1934 /* For each string */
1935 do { /* str_count > 0 so we can use do-while */
1936 size_t length = strnlen(data, len);
1937
1938 if (unlikely(length == len))
1939 goto error_free;
1940
1941 /* user may provide more strings then we need,
1942 * if that's the case we simply ingore the
1943 * rest */
1944 if (likely(needed)) {
1945 /* s->id will be set while adding
1946 * function to configuration so for
1947 * now just leave garbage here. */
1948 s->s = data;
1949 --needed;
1950 ++s;
1951 }
1952
1953 data += length + 1;
1954 len -= length + 1;
1955 } while (--str_count);
1956
1957 s->id = 0; /* terminator */
1958 s->s = NULL;
1959 ++s;
1960
1961 } while (--lang_count);
1962
1963 /* Some garbage left? */
1964 if (unlikely(len))
1965 goto error_free;
1966
1967 /* Done! */
1968 ffs->stringtabs = stringtabs;
1969 ffs->raw_strings = _data;
1970
1971 return 0;
1972
1973error_free:
1974 kfree(stringtabs);
1975error:
1976 kfree(_data);
1977 return -EINVAL;
1978}
1979
1980
1981
1982
1983/* Events handling and management *******************************************/
1984
1985static void __ffs_event_add(struct ffs_data *ffs,
1986 enum usb_functionfs_event_type type)
1987{
1988 enum usb_functionfs_event_type rem_type1, rem_type2 = type;
1989 int neg = 0;
1990
1991 /* Abort any unhandled setup */
1992 /* We do not need to worry about some cmpxchg() changing value
1993 * of ffs->setup_state without holding the lock because when
1994 * state is FFS_SETUP_PENDING cmpxchg() in several places in
1995 * the source does nothing. */
1996 if (ffs->setup_state == FFS_SETUP_PENDING)
1997 ffs->setup_state = FFS_SETUP_CANCELED;
1998
1999 switch (type) {
2000 case FUNCTIONFS_RESUME:
2001 rem_type2 = FUNCTIONFS_SUSPEND;
2002 /* FALL THGOUTH */
2003 case FUNCTIONFS_SUSPEND:
2004 case FUNCTIONFS_SETUP:
2005 rem_type1 = type;
2006 /* discard all similar events */
2007 break;
2008
2009 case FUNCTIONFS_BIND:
2010 case FUNCTIONFS_UNBIND:
2011 case FUNCTIONFS_DISABLE:
2012 case FUNCTIONFS_ENABLE:
2013 /* discard everything other then power management. */
2014 rem_type1 = FUNCTIONFS_SUSPEND;
2015 rem_type2 = FUNCTIONFS_RESUME;
2016 neg = 1;
2017 break;
2018
2019 default:
2020 BUG();
2021 }
2022
2023 {
2024 u8 *ev = ffs->ev.types, *out = ev;
2025 unsigned n = ffs->ev.count;
2026 for (; n; --n, ++ev)
2027 if ((*ev == rem_type1 || *ev == rem_type2) == neg)
2028 *out++ = *ev;
2029 else
2030 FVDBG("purging event %d", *ev);
2031 ffs->ev.count = out - ffs->ev.types;
2032 }
2033
2034 FVDBG("adding event %d", type);
2035 ffs->ev.types[ffs->ev.count++] = type;
2036 wake_up_locked(&ffs->ev.waitq);
2037}
2038
2039static void ffs_event_add(struct ffs_data *ffs,
2040 enum usb_functionfs_event_type type)
2041{
2042 unsigned long flags;
2043 spin_lock_irqsave(&ffs->ev.waitq.lock, flags);
2044 __ffs_event_add(ffs, type);
2045 spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags);
2046}
2047
2048
2049/* Bind/unbind USB function hooks *******************************************/
2050
2051static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep,
2052 struct usb_descriptor_header *desc,
2053 void *priv)
2054{
2055 struct usb_endpoint_descriptor *ds = (void *)desc;
2056 struct ffs_function *func = priv;
2057 struct ffs_ep *ffs_ep;
2058
2059 /* If hs_descriptors is not NULL then we are reading hs
2060 * descriptors now */
2061 const int isHS = func->function.hs_descriptors != NULL;
2062 unsigned idx;
2063
2064 if (type != FFS_DESCRIPTOR)
2065 return 0;
2066
2067 if (isHS)
2068 func->function.hs_descriptors[(long)valuep] = desc;
2069 else
2070 func->function.descriptors[(long)valuep] = desc;
2071
2072 if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT)
2073 return 0;
2074
2075 idx = (ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) - 1;
2076 ffs_ep = func->eps + idx;
2077
2078 if (unlikely(ffs_ep->descs[isHS])) {
2079 FVDBG("two %sspeed descriptors for EP %d",
2080 isHS ? "high" : "full",
2081 ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
2082 return -EINVAL;
2083 }
2084 ffs_ep->descs[isHS] = ds;
2085
2086 ffs_dump_mem(": Original ep desc", ds, ds->bLength);
2087 if (ffs_ep->ep) {
2088 ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress;
2089 if (!ds->wMaxPacketSize)
2090 ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize;
2091 } else {
2092 struct usb_request *req;
2093 struct usb_ep *ep;
2094
2095 FVDBG("autoconfig");
2096 ep = usb_ep_autoconfig(func->gadget, ds);
2097 if (unlikely(!ep))
2098 return -ENOTSUPP;
2099 ep->driver_data = func->eps + idx;;
2100
2101 req = usb_ep_alloc_request(ep, GFP_KERNEL);
2102 if (unlikely(!req))
2103 return -ENOMEM;
2104
2105 ffs_ep->ep = ep;
2106 ffs_ep->req = req;
2107 func->eps_revmap[ds->bEndpointAddress &
2108 USB_ENDPOINT_NUMBER_MASK] = idx + 1;
2109 }
2110 ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength);
2111
2112 return 0;
2113}
2114
2115
2116static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep,
2117 struct usb_descriptor_header *desc,
2118 void *priv)
2119{
2120 struct ffs_function *func = priv;
2121 unsigned idx;
2122 u8 newValue;
2123
2124 switch (type) {
2125 default:
2126 case FFS_DESCRIPTOR:
2127 /* Handled in previous pass by __ffs_func_bind_do_descs() */
2128 return 0;
2129
2130 case FFS_INTERFACE:
2131 idx = *valuep;
2132 if (func->interfaces_nums[idx] < 0) {
2133 int id = usb_interface_id(func->conf, &func->function);
2134 if (unlikely(id < 0))
2135 return id;
2136 func->interfaces_nums[idx] = id;
2137 }
2138 newValue = func->interfaces_nums[idx];
2139 break;
2140
2141 case FFS_STRING:
2142 /* String' IDs are allocated when fsf_data is bound to cdev */
2143 newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id;
2144 break;
2145
2146 case FFS_ENDPOINT:
2147 /* USB_DT_ENDPOINT are handled in
2148 * __ffs_func_bind_do_descs(). */
2149 if (desc->bDescriptorType == USB_DT_ENDPOINT)
2150 return 0;
2151
2152 idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1;
2153 if (unlikely(!func->eps[idx].ep))
2154 return -EINVAL;
2155
2156 {
2157 struct usb_endpoint_descriptor **descs;
2158 descs = func->eps[idx].descs;
2159 newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress;
2160 }
2161 break;
2162 }
2163
2164 FVDBG("%02x -> %02x", *valuep, newValue);
2165 *valuep = newValue;
2166 return 0;
2167}
2168
2169static int ffs_func_bind(struct usb_configuration *c,
2170 struct usb_function *f)
2171{
2172 struct ffs_function *func = ffs_func_from_usb(f);
2173 struct ffs_data *ffs = func->ffs;
2174
2175 const int full = !!func->ffs->fs_descs_count;
2176 const int high = gadget_is_dualspeed(func->gadget) &&
2177 func->ffs->hs_descs_count;
2178
2179 int ret;
2180
2181 /* Make it a single chunk, less management later on */
2182 struct {
2183 struct ffs_ep eps[ffs->eps_count];
2184 struct usb_descriptor_header
2185 *fs_descs[full ? ffs->fs_descs_count + 1 : 0];
2186 struct usb_descriptor_header
2187 *hs_descs[high ? ffs->hs_descs_count + 1 : 0];
2188 short inums[ffs->interfaces_count];
2189 char raw_descs[high ? ffs->raw_descs_length
2190 : ffs->raw_fs_descs_length];
2191 } *data;
2192
2193 ENTER();
2194
2195 /* Only high speed but not supported by gadget? */
2196 if (unlikely(!(full | high)))
2197 return -ENOTSUPP;
2198
2199 /* Allocate */
2200 data = kmalloc(sizeof *data, GFP_KERNEL);
2201 if (unlikely(!data))
2202 return -ENOMEM;
2203
2204 /* Zero */
2205 memset(data->eps, 0, sizeof data->eps);
2206 memcpy(data->raw_descs, ffs->raw_descs + 16, sizeof data->raw_descs);
2207 memset(data->inums, 0xff, sizeof data->inums);
2208 for (ret = ffs->eps_count; ret; --ret)
2209 data->eps[ret].num = -1;
2210
2211 /* Save pointers */
2212 func->eps = data->eps;
2213 func->interfaces_nums = data->inums;
2214
2215 /* Go throught all the endpoint descriptors and allocate
2216 * endpoints first, so that later we can rewrite the endpoint
2217 * numbers without worying that it may be described later on. */
2218 if (likely(full)) {
2219 func->function.descriptors = data->fs_descs;
2220 ret = ffs_do_descs(ffs->fs_descs_count,
2221 data->raw_descs,
2222 sizeof data->raw_descs,
2223 __ffs_func_bind_do_descs, func);
2224 if (unlikely(ret < 0))
2225 goto error;
2226 } else {
2227 ret = 0;
2228 }
2229
2230 if (likely(high)) {
2231 func->function.hs_descriptors = data->hs_descs;
2232 ret = ffs_do_descs(ffs->hs_descs_count,
2233 data->raw_descs + ret,
2234 (sizeof data->raw_descs) - ret,
2235 __ffs_func_bind_do_descs, func);
2236 }
2237
2238 /* Now handle interface numbers allocation and interface and
2239 * enpoint numbers rewritting. We can do that in one go
2240 * now. */
2241 ret = ffs_do_descs(ffs->fs_descs_count +
2242 (high ? ffs->hs_descs_count : 0),
2243 data->raw_descs, sizeof data->raw_descs,
2244 __ffs_func_bind_do_nums, func);
2245 if (unlikely(ret < 0))
2246 goto error;
2247
2248 /* And we're done */
2249 ffs_event_add(ffs, FUNCTIONFS_BIND);
2250 return 0;
2251
2252error:
2253 /* XXX Do we need to release all claimed endpoints here? */
2254 return ret;
2255}
2256
2257
2258/* Other USB function hooks *************************************************/
2259
2260static void ffs_func_unbind(struct usb_configuration *c,
2261 struct usb_function *f)
2262{
2263 struct ffs_function *func = ffs_func_from_usb(f);
2264 struct ffs_data *ffs = func->ffs;
2265
2266 ENTER();
2267
2268 if (ffs->func == func) {
2269 ffs_func_eps_disable(func);
2270 ffs->func = NULL;
2271 }
2272
2273 ffs_event_add(ffs, FUNCTIONFS_UNBIND);
2274
2275 ffs_func_free(func);
2276}
2277
2278
2279static int ffs_func_set_alt(struct usb_function *f,
2280 unsigned interface, unsigned alt)
2281{
2282 struct ffs_function *func = ffs_func_from_usb(f);
2283 struct ffs_data *ffs = func->ffs;
2284 int ret = 0, intf;
2285
2286 if (alt != (unsigned)-1) {
2287 intf = ffs_func_revmap_intf(func, interface);
2288 if (unlikely(intf < 0))
2289 return intf;
2290 }
2291
2292 if (ffs->func)
2293 ffs_func_eps_disable(ffs->func);
2294
2295 if (ffs->state != FFS_ACTIVE)
2296 return -ENODEV;
2297
2298 if (alt == (unsigned)-1) {
2299 ffs->func = NULL;
2300 ffs_event_add(ffs, FUNCTIONFS_DISABLE);
2301 return 0;
2302 }
2303
2304 ffs->func = func;
2305 ret = ffs_func_eps_enable(func);
2306 if (likely(ret >= 0))
2307 ffs_event_add(ffs, FUNCTIONFS_ENABLE);
2308 return ret;
2309}
2310
2311static void ffs_func_disable(struct usb_function *f)
2312{
2313 ffs_func_set_alt(f, 0, (unsigned)-1);
2314}
2315
2316static int ffs_func_setup(struct usb_function *f,
2317 const struct usb_ctrlrequest *creq)
2318{
2319 struct ffs_function *func = ffs_func_from_usb(f);
2320 struct ffs_data *ffs = func->ffs;
2321 unsigned long flags;
2322 int ret;
2323
2324 ENTER();
2325
2326 FVDBG("creq->bRequestType = %02x", creq->bRequestType);
2327 FVDBG("creq->bRequest = %02x", creq->bRequest);
2328 FVDBG("creq->wValue = %04x", le16_to_cpu(creq->wValue));
2329 FVDBG("creq->wIndex = %04x", le16_to_cpu(creq->wIndex));
2330 FVDBG("creq->wLength = %04x", le16_to_cpu(creq->wLength));
2331
2332 /* Most requests directed to interface go throught here
2333 * (notable exceptions are set/get interface) so we need to
2334 * handle them. All other either handled by composite or
2335 * passed to usb_configuration->setup() (if one is set). No
2336 * matter, we will handle requests directed to endpoint here
2337 * as well (as it's straightforward) but what to do with any
2338 * other request? */
2339
2340 if (ffs->state != FFS_ACTIVE)
2341 return -ENODEV;
2342
2343 switch (creq->bRequestType & USB_RECIP_MASK) {
2344 case USB_RECIP_INTERFACE:
2345 ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex));
2346 if (unlikely(ret < 0))
2347 return ret;
2348 break;
2349
2350 case USB_RECIP_ENDPOINT:
2351 ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex));
2352 if (unlikely(ret < 0))
2353 return ret;
2354 break;
2355
2356 default:
2357 return -EOPNOTSUPP;
2358 }
2359
2360 spin_lock_irqsave(&ffs->ev.waitq.lock, flags);
2361 ffs->ev.setup = *creq;
2362 ffs->ev.setup.wIndex = cpu_to_le16(ret);
2363 __ffs_event_add(ffs, FUNCTIONFS_SETUP);
2364 spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags);
2365
2366 return 0;
2367}
2368
2369static void ffs_func_suspend(struct usb_function *f)
2370{
2371 ENTER();
2372 ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND);
2373}
2374
2375static void ffs_func_resume(struct usb_function *f)
2376{
2377 ENTER();
2378 ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME);
2379}
2380
2381
2382
2383/* Enpoint and interface numbers reverse mapping ****************************/
2384
2385static int ffs_func_revmap_ep(struct ffs_function *func, u8 num)
2386{
2387 num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK];
2388 return num ? num : -EDOM;
2389}
2390
2391static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf)
2392{
2393 short *nums = func->interfaces_nums;
2394 unsigned count = func->ffs->interfaces_count;
2395
2396 for (; count; --count, ++nums) {
2397 if (*nums >= 0 && *nums == intf)
2398 return nums - func->interfaces_nums;
2399 }
2400
2401 return -EDOM;
2402}
2403
2404
2405/* Misc helper functions ****************************************************/
2406
2407static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock)
2408{
2409 return nonblock
2410 ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN
2411 : mutex_lock_interruptible(mutex);
2412}
2413
2414
2415static char *ffs_prepare_buffer(const char * __user buf, size_t len)
2416{
2417 char *data;
2418
2419 if (unlikely(!len))
2420 return NULL;
2421
2422 data = kmalloc(len, GFP_KERNEL);
2423 if (unlikely(!data))
2424 return ERR_PTR(-ENOMEM);
2425
2426 if (unlikely(__copy_from_user(data, buf, len))) {
2427 kfree(data);
2428 return ERR_PTR(-EFAULT);
2429 }
2430
2431 FVDBG("Buffer from user space:");
2432 ffs_dump_mem("", data, len);
2433
2434 return data;
2435}
kernel source for telekom puls (alcatel/mediatek)