projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[PATCH] Vectorize aio_read/aio_write fileop methods
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / gadget / inode.c
1 /*
2 * inode.c -- user mode filesystem api for usb gadget controllers
3 *
4 * Copyright (C) 2003-2004 David Brownell
5 * Copyright (C) 2003 Agilent Technologies
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22
23 // #define DEBUG /* data to help fault diagnosis */
24 // #define VERBOSE /* extra debug messages (success too) */
25
26 #include <linux/init.h>
27 #include <linux/module.h>
28 #include <linux/fs.h>
29 #include <linux/pagemap.h>
30 #include <linux/uts.h>
31 #include <linux/wait.h>
32 #include <linux/compiler.h>
33 #include <asm/uaccess.h>
34 #include <linux/slab.h>
35 #include <linux/poll.h>
36
37 #include <linux/device.h>
38 #include <linux/moduleparam.h>
39
40 #include <linux/usb_gadgetfs.h>
41 #include <linux/usb_gadget.h>
42
43
44 /*
45 * The gadgetfs API maps each endpoint to a file descriptor so that you
46 * can use standard synchronous read/write calls for I/O. There's some
47 * O_NONBLOCK and O_ASYNC/FASYNC style i/o support. Example usermode
48 * drivers show how this works in practice. You can also use AIO to
49 * eliminate I/O gaps between requests, to help when streaming data.
50 *
51 * Key parts that must be USB-specific are protocols defining how the
52 * read/write operations relate to the hardware state machines. There
53 * are two types of files. One type is for the device, implementing ep0.
54 * The other type is for each IN or OUT endpoint. In both cases, the
55 * user mode driver must configure the hardware before using it.
56 *
57 * - First, dev_config() is called when /dev/gadget/$CHIP is configured
58 * (by writing configuration and device descriptors). Afterwards it
59 * may serve as a source of device events, used to handle all control
60 * requests other than basic enumeration.
61 *
62 * - Then either immediately, or after a SET_CONFIGURATION control request,
63 * ep_config() is called when each /dev/gadget/ep* file is configured
64 * (by writing endpoint descriptors). Afterwards these files are used
65 * to write() IN data or to read() OUT data. To halt the endpoint, a
66 * "wrong direction" request is issued (like reading an IN endpoint).
67 *
68 * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe
69 * not possible on all hardware. For example, precise fault handling with
70 * respect to data left in endpoint fifos after aborted operations; or
71 * selective clearing of endpoint halts, to implement SET_INTERFACE.
72 */
73
74 #define DRIVER_DESC "USB Gadget filesystem"
75 #define DRIVER_VERSION "24 Aug 2004"
76
77 static const char driver_desc [] = DRIVER_DESC;
78 static const char shortname [] = "gadgetfs";
79
80 MODULE_DESCRIPTION (DRIVER_DESC);
81 MODULE_AUTHOR ("David Brownell");
82 MODULE_LICENSE ("GPL");
83
84
85 /*----------------------------------------------------------------------*/
86
87 #define GADGETFS_MAGIC 0xaee71ee7
88 #define DMA_ADDR_INVALID (~(dma_addr_t)0)
89
90 /* /dev/gadget/$CHIP represents ep0 and the whole device */
91 enum ep0_state {
92 /* DISBLED is the initial state.
93 */
94 STATE_DEV_DISABLED = 0,
95
96 /* Only one open() of /dev/gadget/$CHIP; only one file tracks
97 * ep0/device i/o modes and binding to the controller. Driver
98 * must always write descriptors to initialize the device, then
99 * the device becomes UNCONNECTED until enumeration.
100 */
101 STATE_OPENED,
102
103 /* From then on, ep0 fd is in either of two basic modes:
104 * - (UN)CONNECTED: read usb_gadgetfs_event(s) from it
105 * - SETUP: read/write will transfer control data and succeed;
106 * or if "wrong direction", performs protocol stall
107 */
108 STATE_UNCONNECTED,
109 STATE_CONNECTED,
110 STATE_SETUP,
111
112 /* UNBOUND means the driver closed ep0, so the device won't be
113 * accessible again (DEV_DISABLED) until all fds are closed.
114 */
115 STATE_DEV_UNBOUND,
116 };
117
118 /* enough for the whole queue: most events invalidate others */
119 #define N_EVENT 5
120
121 struct dev_data {
122 spinlock_t lock;
123 atomic_t count;
124 enum ep0_state state;
125 struct usb_gadgetfs_event event [N_EVENT];
126 unsigned ev_next;
127 struct fasync_struct *fasync;
128 u8 current_config;
129
130 /* drivers reading ep0 MUST handle control requests (SETUP)
131 * reported that way; else the host will time out.
132 */
133 unsigned usermode_setup : 1,
134 setup_in : 1,
135 setup_can_stall : 1,
136 setup_out_ready : 1,
137 setup_out_error : 1,
138 setup_abort : 1;
139 unsigned setup_wLength;
140
141 /* the rest is basically write-once */
142 struct usb_config_descriptor *config, *hs_config;
143 struct usb_device_descriptor *dev;
144 struct usb_request *req;
145 struct usb_gadget *gadget;
146 struct list_head epfiles;
147 void *buf;
148 wait_queue_head_t wait;
149 struct super_block *sb;
150 struct dentry *dentry;
151
152 /* except this scratch i/o buffer for ep0 */
153 u8 rbuf [256];
154 };
155
156 static inline void get_dev (struct dev_data *data)
157 {
158 atomic_inc (&data->count);
159 }
160
161 static void put_dev (struct dev_data *data)
162 {
163 if (likely (!atomic_dec_and_test (&data->count)))
164 return;
165 /* needs no more cleanup */
166 BUG_ON (waitqueue_active (&data->wait));
167 kfree (data);
168 }
169
170 static struct dev_data *dev_new (void)
171 {
172 struct dev_data *dev;
173
174 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
175 if (!dev)
176 return NULL;
177 dev->state = STATE_DEV_DISABLED;
178 atomic_set (&dev->count, 1);
179 spin_lock_init (&dev->lock);
180 INIT_LIST_HEAD (&dev->epfiles);
181 init_waitqueue_head (&dev->wait);
182 return dev;
183 }
184
185 /*----------------------------------------------------------------------*/
186
187 /* other /dev/gadget/$ENDPOINT files represent endpoints */
188 enum ep_state {
189 STATE_EP_DISABLED = 0,
190 STATE_EP_READY,
191 STATE_EP_DEFER_ENABLE,
192 STATE_EP_ENABLED,
193 STATE_EP_UNBOUND,
194 };
195
196 struct ep_data {
197 struct semaphore lock;
198 enum ep_state state;
199 atomic_t count;
200 struct dev_data *dev;
201 /* must hold dev->lock before accessing ep or req */
202 struct usb_ep *ep;
203 struct usb_request *req;
204 ssize_t status;
205 char name [16];
206 struct usb_endpoint_descriptor desc, hs_desc;
207 struct list_head epfiles;
208 wait_queue_head_t wait;
209 struct dentry *dentry;
210 struct inode *inode;
211 };
212
213 static inline void get_ep (struct ep_data *data)
214 {
215 atomic_inc (&data->count);
216 }
217
218 static void put_ep (struct ep_data *data)
219 {
220 if (likely (!atomic_dec_and_test (&data->count)))
221 return;
222 put_dev (data->dev);
223 /* needs no more cleanup */
224 BUG_ON (!list_empty (&data->epfiles));
225 BUG_ON (waitqueue_active (&data->wait));
226 kfree (data);
227 }
228
229 /*----------------------------------------------------------------------*/
230
231 /* most "how to use the hardware" policy choices are in userspace:
232 * mapping endpoint roles (which the driver needs) to the capabilities
233 * which the usb controller has. most of those capabilities are exposed
234 * implicitly, starting with the driver name and then endpoint names.
235 */
236
237 static const char *CHIP;
238
239 /*----------------------------------------------------------------------*/
240
241 /* NOTE: don't use dev_printk calls before binding to the gadget
242 * at the end of ep0 configuration, or after unbind.
243 */
244
245 /* too wordy: dev_printk(level , &(d)->gadget->dev , fmt , ## args) */
246 #define xprintk(d,level,fmt,args...) \
247 printk(level "%s: " fmt , shortname , ## args)
248
249 #ifdef DEBUG
250 #define DBG(dev,fmt,args...) \
251 xprintk(dev , KERN_DEBUG , fmt , ## args)
252 #else
253 #define DBG(dev,fmt,args...) \
254 do { } while (0)
255 #endif /* DEBUG */
256
257 #ifdef VERBOSE
258 #define VDEBUG DBG
259 #else
260 #define VDEBUG(dev,fmt,args...) \
261 do { } while (0)
262 #endif /* DEBUG */
263
264 #define ERROR(dev,fmt,args...) \
265 xprintk(dev , KERN_ERR , fmt , ## args)
266 #define WARN(dev,fmt,args...) \
267 xprintk(dev , KERN_WARNING , fmt , ## args)
268 #define INFO(dev,fmt,args...) \
269 xprintk(dev , KERN_INFO , fmt , ## args)
270
271
272 /*----------------------------------------------------------------------*/
273
274 /* SYNCHRONOUS ENDPOINT OPERATIONS (bulk/intr/iso)
275 *
276 * After opening, configure non-control endpoints. Then use normal
277 * stream read() and write() requests; and maybe ioctl() to get more
278 * precise FIFO status when recovering from cancellation.
279 */
280
281 static void epio_complete (struct usb_ep *ep, struct usb_request *req)
282 {
283 struct ep_data *epdata = ep->driver_data;
284
285 if (!req->context)
286 return;
287 if (req->status)
288 epdata->status = req->status;
289 else
290 epdata->status = req->actual;
291 complete ((struct completion *)req->context);
292 }
293
294 /* tasklock endpoint, returning when it's connected.
295 * still need dev->lock to use epdata->ep.
296 */
297 static int
298 get_ready_ep (unsigned f_flags, struct ep_data *epdata)
299 {
300 int val;
301
302 if (f_flags & O_NONBLOCK) {
303 if (down_trylock (&epdata->lock) != 0)
304 goto nonblock;
305 if (epdata->state != STATE_EP_ENABLED) {
306 up (&epdata->lock);
307 nonblock:
308 val = -EAGAIN;
309 } else
310 val = 0;
311 return val;
312 }
313
314 if ((val = down_interruptible (&epdata->lock)) < 0)
315 return val;
316 newstate:
317 switch (epdata->state) {
318 case STATE_EP_ENABLED:
319 break;
320 case STATE_EP_DEFER_ENABLE:
321 DBG (epdata->dev, "%s wait for host\n", epdata->name);
322 if ((val = wait_event_interruptible (epdata->wait,
323 epdata->state != STATE_EP_DEFER_ENABLE
324 || epdata->dev->state == STATE_DEV_UNBOUND
325 )) < 0)
326 goto fail;
327 goto newstate;
328 // case STATE_EP_DISABLED: /* "can't happen" */
329 // case STATE_EP_READY: /* "can't happen" */
330 default: /* error! */
331 pr_debug ("%s: ep %p not available, state %d\n",
332 shortname, epdata, epdata->state);
333 // FALLTHROUGH
334 case STATE_EP_UNBOUND: /* clean disconnect */
335 val = -ENODEV;
336 fail:
337 up (&epdata->lock);
338 }
339 return val;
340 }
341
342 static ssize_t
343 ep_io (struct ep_data *epdata, void *buf, unsigned len)
344 {
345 DECLARE_COMPLETION_ONSTACK (done);
346 int value;
347
348 spin_lock_irq (&epdata->dev->lock);
349 if (likely (epdata->ep != NULL)) {
350 struct usb_request *req = epdata->req;
351
352 req->context = &done;
353 req->complete = epio_complete;
354 req->buf = buf;
355 req->length = len;
356 value = usb_ep_queue (epdata->ep, req, GFP_ATOMIC);
357 } else
358 value = -ENODEV;
359 spin_unlock_irq (&epdata->dev->lock);
360
361 if (likely (value == 0)) {
362 value = wait_event_interruptible (done.wait, done.done);
363 if (value != 0) {
364 spin_lock_irq (&epdata->dev->lock);
365 if (likely (epdata->ep != NULL)) {
366 DBG (epdata->dev, "%s i/o interrupted\n",
367 epdata->name);
368 usb_ep_dequeue (epdata->ep, epdata->req);
369 spin_unlock_irq (&epdata->dev->lock);
370
371 wait_event (done.wait, done.done);
372 if (epdata->status == -ECONNRESET)
373 epdata->status = -EINTR;
374 } else {
375 spin_unlock_irq (&epdata->dev->lock);
376
377 DBG (epdata->dev, "endpoint gone\n");
378 epdata->status = -ENODEV;
379 }
380 }
381 return epdata->status;
382 }
383 return value;
384 }
385
386
387 /* handle a synchronous OUT bulk/intr/iso transfer */
388 static ssize_t
389 ep_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
390 {
391 struct ep_data *data = fd->private_data;
392 void *kbuf;
393 ssize_t value;
394
395 if ((value = get_ready_ep (fd->f_flags, data)) < 0)
396 return value;
397
398 /* halt any endpoint by doing a "wrong direction" i/o call */
399 if (data->desc.bEndpointAddress & USB_DIR_IN) {
400 if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
401 == USB_ENDPOINT_XFER_ISOC)
402 return -EINVAL;
403 DBG (data->dev, "%s halt\n", data->name);
404 spin_lock_irq (&data->dev->lock);
405 if (likely (data->ep != NULL))
406 usb_ep_set_halt (data->ep);
407 spin_unlock_irq (&data->dev->lock);
408 up (&data->lock);
409 return -EBADMSG;
410 }
411
412 /* FIXME readahead for O_NONBLOCK and poll(); careful with ZLPs */
413
414 value = -ENOMEM;
415 kbuf = kmalloc (len, SLAB_KERNEL);
416 if (unlikely (!kbuf))
417 goto free1;
418
419 value = ep_io (data, kbuf, len);
420 VDEBUG (data->dev, "%s read %zu OUT, status %d\n",
421 data->name, len, (int) value);
422 if (value >= 0 && copy_to_user (buf, kbuf, value))
423 value = -EFAULT;
424
425 free1:
426 up (&data->lock);
427 kfree (kbuf);
428 return value;
429 }
430
431 /* handle a synchronous IN bulk/intr/iso transfer */
432 static ssize_t
433 ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
434 {
435 struct ep_data *data = fd->private_data;
436 void *kbuf;
437 ssize_t value;
438
439 if ((value = get_ready_ep (fd->f_flags, data)) < 0)
440 return value;
441
442 /* halt any endpoint by doing a "wrong direction" i/o call */
443 if (!(data->desc.bEndpointAddress & USB_DIR_IN)) {
444 if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
445 == USB_ENDPOINT_XFER_ISOC)
446 return -EINVAL;
447 DBG (data->dev, "%s halt\n", data->name);
448 spin_lock_irq (&data->dev->lock);
449 if (likely (data->ep != NULL))
450 usb_ep_set_halt (data->ep);
451 spin_unlock_irq (&data->dev->lock);
452 up (&data->lock);
453 return -EBADMSG;
454 }
455
456 /* FIXME writebehind for O_NONBLOCK and poll(), qlen = 1 */
457
458 value = -ENOMEM;
459 kbuf = kmalloc (len, SLAB_KERNEL);
460 if (!kbuf)
461 goto free1;
462 if (copy_from_user (kbuf, buf, len)) {
463 value = -EFAULT;
464 goto free1;
465 }
466
467 value = ep_io (data, kbuf, len);
468 VDEBUG (data->dev, "%s write %zu IN, status %d\n",
469 data->name, len, (int) value);
470 free1:
471 up (&data->lock);
472 kfree (kbuf);
473 return value;
474 }
475
476 static int
477 ep_release (struct inode *inode, struct file *fd)
478 {
479 struct ep_data *data = fd->private_data;
480 int value;
481
482 if ((value = down_interruptible(&data->lock)) < 0)
483 return value;
484
485 /* clean up if this can be reopened */
486 if (data->state != STATE_EP_UNBOUND) {
487 data->state = STATE_EP_DISABLED;
488 data->desc.bDescriptorType = 0;
489 data->hs_desc.bDescriptorType = 0;
490 usb_ep_disable(data->ep);
491 }
492 up (&data->lock);
493 put_ep (data);
494 return 0;
495 }
496
497 static int ep_ioctl (struct inode *inode, struct file *fd,
498 unsigned code, unsigned long value)
499 {
500 struct ep_data *data = fd->private_data;
501 int status;
502
503 if ((status = get_ready_ep (fd->f_flags, data)) < 0)
504 return status;
505
506 spin_lock_irq (&data->dev->lock);
507 if (likely (data->ep != NULL)) {
508 switch (code) {
509 case GADGETFS_FIFO_STATUS:
510 status = usb_ep_fifo_status (data->ep);
511 break;
512 case GADGETFS_FIFO_FLUSH:
513 usb_ep_fifo_flush (data->ep);
514 break;
515 case GADGETFS_CLEAR_HALT:
516 status = usb_ep_clear_halt (data->ep);
517 break;
518 default:
519 status = -ENOTTY;
520 }
521 } else
522 status = -ENODEV;
523 spin_unlock_irq (&data->dev->lock);
524 up (&data->lock);
525 return status;
526 }
527
528 /*----------------------------------------------------------------------*/
529
530 /* ASYNCHRONOUS ENDPOINT I/O OPERATIONS (bulk/intr/iso) */
531
532 struct kiocb_priv {
533 struct usb_request *req;
534 struct ep_data *epdata;
535 void *buf;
536 const struct iovec *iv;
537 unsigned long nr_segs;
538 unsigned actual;
539 };
540
541 static int ep_aio_cancel(struct kiocb *iocb, struct io_event *e)
542 {
543 struct kiocb_priv *priv = iocb->private;
544 struct ep_data *epdata;
545 int value;
546
547 local_irq_disable();
548 epdata = priv->epdata;
549 // spin_lock(&epdata->dev->lock);
550 kiocbSetCancelled(iocb);
551 if (likely(epdata && epdata->ep && priv->req))
552 value = usb_ep_dequeue (epdata->ep, priv->req);
553 else
554 value = -EINVAL;
555 // spin_unlock(&epdata->dev->lock);
556 local_irq_enable();
557
558 aio_put_req(iocb);
559 return value;
560 }
561
562 static ssize_t ep_aio_read_retry(struct kiocb *iocb)
563 {
564 struct kiocb_priv *priv = iocb->private;
565 ssize_t len, total;
566 int i;
567
568 /* we "retry" to get the right mm context for this: */
569
570 /* copy stuff into user buffers */
571 total = priv->actual;
572 len = 0;
573 for (i=0; i < priv->nr_segs; i++) {
574 ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total);
575
576 if (copy_to_user(priv->iv[i].iov_base, priv->buf, this)) {
577 if (len == 0)
578 len = -EFAULT;
579 break;
580 }
581
582 total -= this;
583 len += this;
584 if (total == 0)
585 break;
586 }
587 kfree(priv->buf);
588 kfree(priv);
589 aio_put_req(iocb);
590 return len;
591 }
592
593 static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req)
594 {
595 struct kiocb *iocb = req->context;
596 struct kiocb_priv *priv = iocb->private;
597 struct ep_data *epdata = priv->epdata;
598
599 /* lock against disconnect (and ideally, cancel) */
600 spin_lock(&epdata->dev->lock);
601 priv->req = NULL;
602 priv->epdata = NULL;
603 if (priv->iv == NULL
604 || unlikely(req->actual == 0)
605 || unlikely(kiocbIsCancelled(iocb))) {
606 kfree(req->buf);
607 kfree(priv);
608 iocb->private = NULL;
609 /* aio_complete() reports bytes-transferred _and_ faults */
610 if (unlikely(kiocbIsCancelled(iocb)))
611 aio_put_req(iocb);
612 else
613 aio_complete(iocb,
614 req->actual ? req->actual : req->status,
615 req->status);
616 } else {
617 /* retry() won't report both; so we hide some faults */
618 if (unlikely(0 != req->status))
619 DBG(epdata->dev, "%s fault %d len %d\n",
620 ep->name, req->status, req->actual);
621
622 priv->buf = req->buf;
623 priv->actual = req->actual;
624 kick_iocb(iocb);
625 }
626 spin_unlock(&epdata->dev->lock);
627
628 usb_ep_free_request(ep, req);
629 put_ep(epdata);
630 }
631
632 static ssize_t
633 ep_aio_rwtail(
634 struct kiocb *iocb,
635 char *buf,
636 size_t len,
637 struct ep_data *epdata,
638 const struct iovec *iv,
639 unsigned long nr_segs
640 )
641 {
642 struct kiocb_priv *priv;
643 struct usb_request *req;
644 ssize_t value;
645
646 priv = kmalloc(sizeof *priv, GFP_KERNEL);
647 if (!priv) {
648 value = -ENOMEM;
649 fail:
650 kfree(buf);
651 return value;
652 }
653 iocb->private = priv;
654 priv->iv = iv;
655 priv->nr_segs = nr_segs;
656
657 value = get_ready_ep(iocb->ki_filp->f_flags, epdata);
658 if (unlikely(value < 0)) {
659 kfree(priv);
660 goto fail;
661 }
662
663 iocb->ki_cancel = ep_aio_cancel;
664 get_ep(epdata);
665 priv->epdata = epdata;
666 priv->actual = 0;
667
668 /* each kiocb is coupled to one usb_request, but we can't
669 * allocate or submit those if the host disconnected.
670 */
671 spin_lock_irq(&epdata->dev->lock);
672 if (likely(epdata->ep)) {
673 req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC);
674 if (likely(req)) {
675 priv->req = req;
676 req->buf = buf;
677 req->length = len;
678 req->complete = ep_aio_complete;
679 req->context = iocb;
680 value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC);
681 if (unlikely(0 != value))
682 usb_ep_free_request(epdata->ep, req);
683 } else
684 value = -EAGAIN;
685 } else
686 value = -ENODEV;
687 spin_unlock_irq(&epdata->dev->lock);
688
689 up(&epdata->lock);
690
691 if (unlikely(value)) {
692 kfree(priv);
693 put_ep(epdata);
694 } else
695 value = (iv ? -EIOCBRETRY : -EIOCBQUEUED);
696 return value;
697 }
698
699 static ssize_t
700 ep_aio_read(struct kiocb *iocb, const struct iovec *iov,
701 unsigned long nr_segs, loff_t o)
702 {
703 struct ep_data *epdata = iocb->ki_filp->private_data;
704 char *buf;
705
706 if (unlikely(epdata->desc.bEndpointAddress & USB_DIR_IN))
707 return -EINVAL;
708
709 buf = kmalloc(iocb->ki_left, GFP_KERNEL);
710 if (unlikely(!buf))
711 return -ENOMEM;
712
713 iocb->ki_retry = ep_aio_read_retry;
714 return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs);
715 }
716
717 static ssize_t
718 ep_aio_write(struct kiocb *iocb, const struct iovec *iov,
719 unsigned long nr_segs, loff_t o)
720 {
721 struct ep_data *epdata = iocb->ki_filp->private_data;
722 char *buf;
723 size_t len = 0;
724 int i = 0;
725
726 if (unlikely(!(epdata->desc.bEndpointAddress & USB_DIR_IN)))
727 return -EINVAL;
728
729 buf = kmalloc(iocb->ki_left, GFP_KERNEL);
730 if (unlikely(!buf))
731 return -ENOMEM;
732
733 for (i=0; i < nr_segs; i++) {
734 if (unlikely(copy_from_user(&buf[len], iov[i].iov_base,
735 iov[i].iov_len) != 0)) {
736 kfree(buf);
737 return -EFAULT;
738 }
739 len += iov[i].iov_len;
740 }
741 return ep_aio_rwtail(iocb, buf, len, epdata, NULL, 0);
742 }
743
744 /*----------------------------------------------------------------------*/
745
746 /* used after endpoint configuration */
747 static const struct file_operations ep_io_operations = {
748 .owner = THIS_MODULE,
749 .llseek = no_llseek,
750
751 .read = ep_read,
752 .write = ep_write,
753 .ioctl = ep_ioctl,
754 .release = ep_release,
755
756 .aio_read = ep_aio_read,
757 .aio_write = ep_aio_write,
758 };
759
760 /* ENDPOINT INITIALIZATION
761 *
762 * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR)
763 * status = write (fd, descriptors, sizeof descriptors)
764 *
765 * That write establishes the endpoint configuration, configuring
766 * the controller to process bulk, interrupt, or isochronous transfers
767 * at the right maxpacket size, and so on.
768 *
769 * The descriptors are message type 1, identified by a host order u32
770 * at the beginning of what's written. Descriptor order is: full/low
771 * speed descriptor, then optional high speed descriptor.
772 */
773 static ssize_t
774 ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
775 {
776 struct ep_data *data = fd->private_data;
777 struct usb_ep *ep;
778 u32 tag;
779 int value, length = len;
780
781 if ((value = down_interruptible (&data->lock)) < 0)
782 return value;
783
784 if (data->state != STATE_EP_READY) {
785 value = -EL2HLT;
786 goto fail;
787 }
788
789 value = len;
790 if (len < USB_DT_ENDPOINT_SIZE + 4)
791 goto fail0;
792
793 /* we might need to change message format someday */
794 if (copy_from_user (&tag, buf, 4)) {
795 goto fail1;
796 }
797 if (tag != 1) {
798 DBG(data->dev, "config %s, bad tag %d\n", data->name, tag);
799 goto fail0;
800 }
801 buf += 4;
802 len -= 4;
803
804 /* NOTE: audio endpoint extensions not accepted here;
805 * just don't include the extra bytes.
806 */
807
808 /* full/low speed descriptor, then high speed */
809 if (copy_from_user (&data->desc, buf, USB_DT_ENDPOINT_SIZE)) {
810 goto fail1;
811 }
812 if (data->desc.bLength != USB_DT_ENDPOINT_SIZE
813 || data->desc.bDescriptorType != USB_DT_ENDPOINT)
814 goto fail0;
815 if (len != USB_DT_ENDPOINT_SIZE) {
816 if (len != 2 * USB_DT_ENDPOINT_SIZE)
817 goto fail0;
818 if (copy_from_user (&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE,
819 USB_DT_ENDPOINT_SIZE)) {
820 goto fail1;
821 }
822 if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE
823 || data->hs_desc.bDescriptorType
824 != USB_DT_ENDPOINT) {
825 DBG(data->dev, "config %s, bad hs length or type\n",
826 data->name);
827 goto fail0;
828 }
829 }
830
831 spin_lock_irq (&data->dev->lock);
832 if (data->dev->state == STATE_DEV_UNBOUND) {
833 value = -ENOENT;
834 goto gone;
835 } else if ((ep = data->ep) == NULL) {
836 value = -ENODEV;
837 goto gone;
838 }
839 switch (data->dev->gadget->speed) {
840 case USB_SPEED_LOW:
841 case USB_SPEED_FULL:
842 value = usb_ep_enable (ep, &data->desc);
843 if (value == 0)
844 data->state = STATE_EP_ENABLED;
845 break;
846 #ifdef CONFIG_USB_GADGET_DUALSPEED
847 case USB_SPEED_HIGH:
848 /* fails if caller didn't provide that descriptor... */
849 value = usb_ep_enable (ep, &data->hs_desc);
850 if (value == 0)
851 data->state = STATE_EP_ENABLED;
852 break;
853 #endif
854 default:
855 DBG (data->dev, "unconnected, %s init deferred\n",
856 data->name);
857 data->state = STATE_EP_DEFER_ENABLE;
858 }
859 if (value == 0) {
860 fd->f_op = &ep_io_operations;
861 value = length;
862 }
863 gone:
864 spin_unlock_irq (&data->dev->lock);
865 if (value < 0) {
866 fail:
867 data->desc.bDescriptorType = 0;
868 data->hs_desc.bDescriptorType = 0;
869 }
870 up (&data->lock);
871 return value;
872 fail0:
873 value = -EINVAL;
874 goto fail;
875 fail1:
876 value = -EFAULT;
877 goto fail;
878 }
879
880 static int
881 ep_open (struct inode *inode, struct file *fd)
882 {
883 struct ep_data *data = inode->i_private;
884 int value = -EBUSY;
885
886 if (down_interruptible (&data->lock) != 0)
887 return -EINTR;
888 spin_lock_irq (&data->dev->lock);
889 if (data->dev->state == STATE_DEV_UNBOUND)
890 value = -ENOENT;
891 else if (data->state == STATE_EP_DISABLED) {
892 value = 0;
893 data->state = STATE_EP_READY;
894 get_ep (data);
895 fd->private_data = data;
896 VDEBUG (data->dev, "%s ready\n", data->name);
897 } else
898 DBG (data->dev, "%s state %d\n",
899 data->name, data->state);
900 spin_unlock_irq (&data->dev->lock);
901 up (&data->lock);
902 return value;
903 }
904
905 /* used before endpoint configuration */
906 static const struct file_operations ep_config_operations = {
907 .owner = THIS_MODULE,
908 .llseek = no_llseek,
909
910 .open = ep_open,
911 .write = ep_config,
912 .release = ep_release,
913 };
914
915 /*----------------------------------------------------------------------*/
916
917 /* EP0 IMPLEMENTATION can be partly in userspace.
918 *
919 * Drivers that use this facility receive various events, including
920 * control requests the kernel doesn't handle. Drivers that don't
921 * use this facility may be too simple-minded for real applications.
922 */
923
924 static inline void ep0_readable (struct dev_data *dev)
925 {
926 wake_up (&dev->wait);
927 kill_fasync (&dev->fasync, SIGIO, POLL_IN);
928 }
929
930 static void clean_req (struct usb_ep *ep, struct usb_request *req)
931 {
932 struct dev_data *dev = ep->driver_data;
933
934 if (req->buf != dev->rbuf) {
935 usb_ep_free_buffer (ep, req->buf, req->dma, req->length);
936 req->buf = dev->rbuf;
937 req->dma = DMA_ADDR_INVALID;
938 }
939 req->complete = epio_complete;
940 dev->setup_out_ready = 0;
941 }
942
943 static void ep0_complete (struct usb_ep *ep, struct usb_request *req)
944 {
945 struct dev_data *dev = ep->driver_data;
946 int free = 1;
947
948 /* for control OUT, data must still get to userspace */
949 if (!dev->setup_in) {
950 dev->setup_out_error = (req->status != 0);
951 if (!dev->setup_out_error)
952 free = 0;
953 dev->setup_out_ready = 1;
954 ep0_readable (dev);
955 } else if (dev->state == STATE_SETUP)
956 dev->state = STATE_CONNECTED;
957
958 /* clean up as appropriate */
959 if (free && req->buf != &dev->rbuf)
960 clean_req (ep, req);
961 req->complete = epio_complete;
962 }
963
964 static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len)
965 {
966 struct dev_data *dev = ep->driver_data;
967
968 if (dev->setup_out_ready) {
969 DBG (dev, "ep0 request busy!\n");
970 return -EBUSY;
971 }
972 if (len > sizeof (dev->rbuf))
973 req->buf = usb_ep_alloc_buffer (ep, len, &req->dma, GFP_ATOMIC);
974 if (req->buf == 0) {
975 req->buf = dev->rbuf;
976 return -ENOMEM;
977 }
978 req->complete = ep0_complete;
979 req->length = len;
980 req->zero = 0;
981 return 0;
982 }
983
984 static ssize_t
985 ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
986 {
987 struct dev_data *dev = fd->private_data;
988 ssize_t retval;
989 enum ep0_state state;
990
991 spin_lock_irq (&dev->lock);
992
993 /* report fd mode change before acting on it */
994 if (dev->setup_abort) {
995 dev->setup_abort = 0;
996 retval = -EIDRM;
997 goto done;
998 }
999
1000 /* control DATA stage */
1001 if ((state = dev->state) == STATE_SETUP) {
1002
1003 if (dev->setup_in) { /* stall IN */
1004 VDEBUG(dev, "ep0in stall\n");
1005 (void) usb_ep_set_halt (dev->gadget->ep0);
1006 retval = -EL2HLT;
1007 dev->state = STATE_CONNECTED;
1008
1009 } else if (len == 0) { /* ack SET_CONFIGURATION etc */
1010 struct usb_ep *ep = dev->gadget->ep0;
1011 struct usb_request *req = dev->req;
1012
1013 if ((retval = setup_req (ep, req, 0)) == 0)
1014 retval = usb_ep_queue (ep, req, GFP_ATOMIC);
1015 dev->state = STATE_CONNECTED;
1016
1017 /* assume that was SET_CONFIGURATION */
1018 if (dev->current_config) {
1019 unsigned power;
1020 #ifdef CONFIG_USB_GADGET_DUALSPEED
1021 if (dev->gadget->speed == USB_SPEED_HIGH)
1022 power = dev->hs_config->bMaxPower;
1023 else
1024 #endif
1025 power = dev->config->bMaxPower;
1026 usb_gadget_vbus_draw(dev->gadget, 2 * power);
1027 }
1028
1029 } else { /* collect OUT data */
1030 if ((fd->f_flags & O_NONBLOCK) != 0
1031 && !dev->setup_out_ready) {
1032 retval = -EAGAIN;
1033 goto done;
1034 }
1035 spin_unlock_irq (&dev->lock);
1036 retval = wait_event_interruptible (dev->wait,
1037 dev->setup_out_ready != 0);
1038
1039 /* FIXME state could change from under us */
1040 spin_lock_irq (&dev->lock);
1041 if (retval)
1042 goto done;
1043 if (dev->setup_out_error)
1044 retval = -EIO;
1045 else {
1046 len = min (len, (size_t)dev->req->actual);
1047 // FIXME don't call this with the spinlock held ...
1048 if (copy_to_user (buf, dev->req->buf, len))
1049 retval = -EFAULT;
1050 clean_req (dev->gadget->ep0, dev->req);
1051 /* NOTE userspace can't yet choose to stall */
1052 }
1053 }
1054 goto done;
1055 }
1056
1057 /* else normal: return event data */
1058 if (len < sizeof dev->event [0]) {
1059 retval = -EINVAL;
1060 goto done;
1061 }
1062 len -= len % sizeof (struct usb_gadgetfs_event);
1063 dev->usermode_setup = 1;
1064
1065 scan:
1066 /* return queued events right away */
1067 if (dev->ev_next != 0) {
1068 unsigned i, n;
1069 int tmp = dev->ev_next;
1070
1071 len = min (len, tmp * sizeof (struct usb_gadgetfs_event));
1072 n = len / sizeof (struct usb_gadgetfs_event);
1073
1074 /* ep0 can't deliver events when STATE_SETUP */
1075 for (i = 0; i < n; i++) {
1076 if (dev->event [i].type == GADGETFS_SETUP) {
1077 len = i + 1;
1078 len *= sizeof (struct usb_gadgetfs_event);
1079 n = 0;
1080 break;
1081 }
1082 }
1083 spin_unlock_irq (&dev->lock);
1084 if (copy_to_user (buf, &dev->event, len))
1085 retval = -EFAULT;
1086 else
1087 retval = len;
1088 if (len > 0) {
1089 len /= sizeof (struct usb_gadgetfs_event);
1090
1091 /* NOTE this doesn't guard against broken drivers;
1092 * concurrent ep0 readers may lose events.
1093 */
1094 spin_lock_irq (&dev->lock);
1095 dev->ev_next -= len;
1096 if (dev->ev_next != 0)
1097 memmove (&dev->event, &dev->event [len],
1098 sizeof (struct usb_gadgetfs_event)
1099 * (tmp - len));
1100 if (n == 0)
1101 dev->state = STATE_SETUP;
1102 spin_unlock_irq (&dev->lock);
1103 }
1104 return retval;
1105 }
1106 if (fd->f_flags & O_NONBLOCK) {
1107 retval = -EAGAIN;
1108 goto done;
1109 }
1110
1111 switch (state) {
1112 default:
1113 DBG (dev, "fail %s, state %d\n", __FUNCTION__, state);
1114 retval = -ESRCH;
1115 break;
1116 case STATE_UNCONNECTED:
1117 case STATE_CONNECTED:
1118 spin_unlock_irq (&dev->lock);
1119 DBG (dev, "%s wait\n", __FUNCTION__);
1120
1121 /* wait for events */
1122 retval = wait_event_interruptible (dev->wait,
1123 dev->ev_next != 0);
1124 if (retval < 0)
1125 return retval;
1126 spin_lock_irq (&dev->lock);
1127 goto scan;
1128 }
1129
1130 done:
1131 spin_unlock_irq (&dev->lock);
1132 return retval;
1133 }
1134
1135 static struct usb_gadgetfs_event *
1136 next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type)
1137 {
1138 struct usb_gadgetfs_event *event;
1139 unsigned i;
1140
1141 switch (type) {
1142 /* these events purge the queue */
1143 case GADGETFS_DISCONNECT:
1144 if (dev->state == STATE_SETUP)
1145 dev->setup_abort = 1;
1146 // FALL THROUGH
1147 case GADGETFS_CONNECT:
1148 dev->ev_next = 0;
1149 break;
1150 case GADGETFS_SETUP: /* previous request timed out */
1151 case GADGETFS_SUSPEND: /* same effect */
1152 /* these events can't be repeated */
1153 for (i = 0; i != dev->ev_next; i++) {
1154 if (dev->event [i].type != type)
1155 continue;
1156 DBG (dev, "discard old event %d\n", type);
1157 dev->ev_next--;
1158 if (i == dev->ev_next)
1159 break;
1160 /* indices start at zero, for simplicity */
1161 memmove (&dev->event [i], &dev->event [i + 1],
1162 sizeof (struct usb_gadgetfs_event)
1163 * (dev->ev_next - i));
1164 }
1165 break;
1166 default:
1167 BUG ();
1168 }
1169 event = &dev->event [dev->ev_next++];
1170 BUG_ON (dev->ev_next > N_EVENT);
1171 VDEBUG (dev, "ev %d, next %d\n", type, dev->ev_next);
1172 memset (event, 0, sizeof *event);
1173 event->type = type;
1174 return event;
1175 }
1176
1177 static ssize_t
1178 ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
1179 {
1180 struct dev_data *dev = fd->private_data;
1181 ssize_t retval = -ESRCH;
1182
1183 spin_lock_irq (&dev->lock);
1184
1185 /* report fd mode change before acting on it */
1186 if (dev->setup_abort) {
1187 dev->setup_abort = 0;
1188 retval = -EIDRM;
1189
1190 /* data and/or status stage for control request */
1191 } else if (dev->state == STATE_SETUP) {
1192
1193 /* IN DATA+STATUS caller makes len <= wLength */
1194 if (dev->setup_in) {
1195 retval = setup_req (dev->gadget->ep0, dev->req, len);
1196 if (retval == 0) {
1197 spin_unlock_irq (&dev->lock);
1198 if (copy_from_user (dev->req->buf, buf, len))
1199 retval = -EFAULT;
1200 else {
1201 if (len < dev->setup_wLength)
1202 dev->req->zero = 1;
1203 retval = usb_ep_queue (
1204 dev->gadget->ep0, dev->req,
1205 GFP_KERNEL);
1206 }
1207 if (retval < 0) {
1208 spin_lock_irq (&dev->lock);
1209 clean_req (dev->gadget->ep0, dev->req);
1210 spin_unlock_irq (&dev->lock);
1211 } else
1212 retval = len;
1213
1214 return retval;
1215 }
1216
1217 /* can stall some OUT transfers */
1218 } else if (dev->setup_can_stall) {
1219 VDEBUG(dev, "ep0out stall\n");
1220 (void) usb_ep_set_halt (dev->gadget->ep0);
1221 retval = -EL2HLT;
1222 dev->state = STATE_CONNECTED;
1223 } else {
1224 DBG(dev, "bogus ep0out stall!\n");
1225 }
1226 } else
1227 DBG (dev, "fail %s, state %d\n", __FUNCTION__, dev->state);
1228
1229 spin_unlock_irq (&dev->lock);
1230 return retval;
1231 }
1232
1233 static int
1234 ep0_fasync (int f, struct file *fd, int on)
1235 {
1236 struct dev_data *dev = fd->private_data;
1237 // caller must F_SETOWN before signal delivery happens
1238 VDEBUG (dev, "%s %s\n", __FUNCTION__, on ? "on" : "off");
1239 return fasync_helper (f, fd, on, &dev->fasync);
1240 }
1241
1242 static struct usb_gadget_driver gadgetfs_driver;
1243
1244 static int
1245 dev_release (struct inode *inode, struct file *fd)
1246 {
1247 struct dev_data *dev = fd->private_data;
1248
1249 /* closing ep0 === shutdown all */
1250
1251 usb_gadget_unregister_driver (&gadgetfs_driver);
1252
1253 /* at this point "good" hardware has disconnected the
1254 * device from USB; the host won't see it any more.
1255 * alternatively, all host requests will time out.
1256 */
1257
1258 fasync_helper (-1, fd, 0, &dev->fasync);
1259 kfree (dev->buf);
1260 dev->buf = NULL;
1261 put_dev (dev);
1262
1263 /* other endpoints were all decoupled from this device */
1264 dev->state = STATE_DEV_DISABLED;
1265 return 0;
1266 }
1267
1268 static unsigned int
1269 ep0_poll (struct file *fd, poll_table *wait)
1270 {
1271 struct dev_data *dev = fd->private_data;
1272 int mask = 0;
1273
1274 poll_wait(fd, &dev->wait, wait);
1275
1276 spin_lock_irq (&dev->lock);
1277
1278 /* report fd mode change before acting on it */
1279 if (dev->setup_abort) {
1280 dev->setup_abort = 0;
1281 mask = POLLHUP;
1282 goto out;
1283 }
1284
1285 if (dev->state == STATE_SETUP) {
1286 if (dev->setup_in || dev->setup_can_stall)
1287 mask = POLLOUT;
1288 } else {
1289 if (dev->ev_next != 0)
1290 mask = POLLIN;
1291 }
1292 out:
1293 spin_unlock_irq(&dev->lock);
1294 return mask;
1295 }
1296
1297 static int dev_ioctl (struct inode *inode, struct file *fd,
1298 unsigned code, unsigned long value)
1299 {
1300 struct dev_data *dev = fd->private_data;
1301 struct usb_gadget *gadget = dev->gadget;
1302
1303 if (gadget->ops->ioctl)
1304 return gadget->ops->ioctl (gadget, code, value);
1305 return -ENOTTY;
1306 }
1307
1308 /* used after device configuration */
1309 static const struct file_operations ep0_io_operations = {
1310 .owner = THIS_MODULE,
1311 .llseek = no_llseek,
1312
1313 .read = ep0_read,
1314 .write = ep0_write,
1315 .fasync = ep0_fasync,
1316 .poll = ep0_poll,
1317 .ioctl = dev_ioctl,
1318 .release = dev_release,
1319 };
1320
1321 /*----------------------------------------------------------------------*/
1322
1323 /* The in-kernel gadget driver handles most ep0 issues, in particular
1324 * enumerating the single configuration (as provided from user space).
1325 *
1326 * Unrecognized ep0 requests may be handled in user space.
1327 */
1328
1329 #ifdef CONFIG_USB_GADGET_DUALSPEED
1330 static void make_qualifier (struct dev_data *dev)
1331 {
1332 struct usb_qualifier_descriptor qual;
1333 struct usb_device_descriptor *desc;
1334
1335 qual.bLength = sizeof qual;
1336 qual.bDescriptorType = USB_DT_DEVICE_QUALIFIER;
1337 qual.bcdUSB = __constant_cpu_to_le16 (0x0200);
1338
1339 desc = dev->dev;
1340 qual.bDeviceClass = desc->bDeviceClass;
1341 qual.bDeviceSubClass = desc->bDeviceSubClass;
1342 qual.bDeviceProtocol = desc->bDeviceProtocol;
1343
1344 /* assumes ep0 uses the same value for both speeds ... */
1345 qual.bMaxPacketSize0 = desc->bMaxPacketSize0;
1346
1347 qual.bNumConfigurations = 1;
1348 qual.bRESERVED = 0;
1349
1350 memcpy (dev->rbuf, &qual, sizeof qual);
1351 }
1352 #endif
1353
1354 static int
1355 config_buf (struct dev_data *dev, u8 type, unsigned index)
1356 {
1357 int len;
1358 #ifdef CONFIG_USB_GADGET_DUALSPEED
1359 int hs;
1360 #endif
1361
1362 /* only one configuration */
1363 if (index > 0)
1364 return -EINVAL;
1365
1366 #ifdef CONFIG_USB_GADGET_DUALSPEED
1367 hs = (dev->gadget->speed == USB_SPEED_HIGH);
1368 if (type == USB_DT_OTHER_SPEED_CONFIG)
1369 hs = !hs;
1370 if (hs) {
1371 dev->req->buf = dev->hs_config;
1372 len = le16_to_cpup (&dev->hs_config->wTotalLength);
1373 } else
1374 #endif
1375 {
1376 dev->req->buf = dev->config;
1377 len = le16_to_cpup (&dev->config->wTotalLength);
1378 }
1379 ((u8 *)dev->req->buf) [1] = type;
1380 return len;
1381 }
1382
1383 static int
1384 gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1385 {
1386 struct dev_data *dev = get_gadget_data (gadget);
1387 struct usb_request *req = dev->req;
1388 int value = -EOPNOTSUPP;
1389 struct usb_gadgetfs_event *event;
1390 u16 w_value = le16_to_cpu(ctrl->wValue);
1391 u16 w_length = le16_to_cpu(ctrl->wLength);
1392
1393 spin_lock (&dev->lock);
1394 dev->setup_abort = 0;
1395 if (dev->state == STATE_UNCONNECTED) {
1396 struct usb_ep *ep;
1397 struct ep_data *data;
1398
1399 dev->state = STATE_CONNECTED;
1400 dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket;
1401
1402 #ifdef CONFIG_USB_GADGET_DUALSPEED
1403 if (gadget->speed == USB_SPEED_HIGH && dev->hs_config == 0) {
1404 ERROR (dev, "no high speed config??\n");
1405 return -EINVAL;
1406 }
1407 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1408
1409 INFO (dev, "connected\n");
1410 event = next_event (dev, GADGETFS_CONNECT);
1411 event->u.speed = gadget->speed;
1412 ep0_readable (dev);
1413
1414 list_for_each_entry (ep, &gadget->ep_list, ep_list) {
1415 data = ep->driver_data;
1416 /* ... down_trylock (&data->lock) ... */
1417 if (data->state != STATE_EP_DEFER_ENABLE)
1418 continue;
1419 #ifdef CONFIG_USB_GADGET_DUALSPEED
1420 if (gadget->speed == USB_SPEED_HIGH)
1421 value = usb_ep_enable (ep, &data->hs_desc);
1422 else
1423 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1424 value = usb_ep_enable (ep, &data->desc);
1425 if (value) {
1426 ERROR (dev, "deferred %s enable --> %d\n",
1427 data->name, value);
1428 continue;
1429 }
1430 data->state = STATE_EP_ENABLED;
1431 wake_up (&data->wait);
1432 DBG (dev, "woke up %s waiters\n", data->name);
1433 }
1434
1435 /* host may have given up waiting for response. we can miss control
1436 * requests handled lower down (device/endpoint status and features);
1437 * then ep0_{read,write} will report the wrong status. controller
1438 * driver will have aborted pending i/o.
1439 */
1440 } else if (dev->state == STATE_SETUP)
1441 dev->setup_abort = 1;
1442
1443 req->buf = dev->rbuf;
1444 req->dma = DMA_ADDR_INVALID;
1445 req->context = NULL;
1446 value = -EOPNOTSUPP;
1447 switch (ctrl->bRequest) {
1448
1449 case USB_REQ_GET_DESCRIPTOR:
1450 if (ctrl->bRequestType != USB_DIR_IN)
1451 goto unrecognized;
1452 switch (w_value >> 8) {
1453
1454 case USB_DT_DEVICE:
1455 value = min (w_length, (u16) sizeof *dev->dev);
1456 req->buf = dev->dev;
1457 break;
1458 #ifdef CONFIG_USB_GADGET_DUALSPEED
1459 case USB_DT_DEVICE_QUALIFIER:
1460 if (!dev->hs_config)
1461 break;
1462 value = min (w_length, (u16)
1463 sizeof (struct usb_qualifier_descriptor));
1464 make_qualifier (dev);
1465 break;
1466 case USB_DT_OTHER_SPEED_CONFIG:
1467 // FALLTHROUGH
1468 #endif
1469 case USB_DT_CONFIG:
1470 value = config_buf (dev,
1471 w_value >> 8,
1472 w_value & 0xff);
1473 if (value >= 0)
1474 value = min (w_length, (u16) value);
1475 break;
1476 case USB_DT_STRING:
1477 goto unrecognized;
1478
1479 default: // all others are errors
1480 break;
1481 }
1482 break;
1483
1484 /* currently one config, two speeds */
1485 case USB_REQ_SET_CONFIGURATION:
1486 if (ctrl->bRequestType != 0)
1487 break;
1488 if (0 == (u8) w_value) {
1489 value = 0;
1490 dev->current_config = 0;
1491 usb_gadget_vbus_draw(gadget, 8 /* mA */ );
1492 // user mode expected to disable endpoints
1493 } else {
1494 u8 config, power;
1495 #ifdef CONFIG_USB_GADGET_DUALSPEED
1496 if (gadget->speed == USB_SPEED_HIGH) {
1497 config = dev->hs_config->bConfigurationValue;
1498 power = dev->hs_config->bMaxPower;
1499 } else
1500 #endif
1501 {
1502 config = dev->config->bConfigurationValue;
1503 power = dev->config->bMaxPower;
1504 }
1505
1506 if (config == (u8) w_value) {
1507 value = 0;
1508 dev->current_config = config;
1509 usb_gadget_vbus_draw(gadget, 2 * power);
1510 }
1511 }
1512
1513 /* report SET_CONFIGURATION like any other control request,
1514 * except that usermode may not stall this. the next
1515 * request mustn't be allowed start until this finishes:
1516 * endpoints and threads set up, etc.
1517 *
1518 * NOTE: older PXA hardware (before PXA 255: without UDCCFR)
1519 * has bad/racey automagic that prevents synchronizing here.
1520 * even kernel mode drivers often miss them.
1521 */
1522 if (value == 0) {
1523 INFO (dev, "configuration #%d\n", dev->current_config);
1524 if (dev->usermode_setup) {
1525 dev->setup_can_stall = 0;
1526 goto delegate;
1527 }
1528 }
1529 break;
1530
1531 #ifndef CONFIG_USB_GADGETFS_PXA2XX
1532 /* PXA automagically handles this request too */
1533 case USB_REQ_GET_CONFIGURATION:
1534 if (ctrl->bRequestType != 0x80)
1535 break;
1536 *(u8 *)req->buf = dev->current_config;
1537 value = min (w_length, (u16) 1);
1538 break;
1539 #endif
1540
1541 default:
1542 unrecognized:
1543 VDEBUG (dev, "%s req%02x.%02x v%04x i%04x l%d\n",
1544 dev->usermode_setup ? "delegate" : "fail",
1545 ctrl->bRequestType, ctrl->bRequest,
1546 w_value, le16_to_cpu(ctrl->wIndex), w_length);
1547
1548 /* if there's an ep0 reader, don't stall */
1549 if (dev->usermode_setup) {
1550 dev->setup_can_stall = 1;
1551 delegate:
1552 dev->setup_in = (ctrl->bRequestType & USB_DIR_IN)
1553 ? 1 : 0;
1554 dev->setup_wLength = w_length;
1555 dev->setup_out_ready = 0;
1556 dev->setup_out_error = 0;
1557 value = 0;
1558
1559 /* read DATA stage for OUT right away */
1560 if (unlikely (!dev->setup_in && w_length)) {
1561 value = setup_req (gadget->ep0, dev->req,
1562 w_length);
1563 if (value < 0)
1564 break;
1565 value = usb_ep_queue (gadget->ep0, dev->req,
1566 GFP_ATOMIC);
1567 if (value < 0) {
1568 clean_req (gadget->ep0, dev->req);
1569 break;
1570 }
1571
1572 /* we can't currently stall these */
1573 dev->setup_can_stall = 0;
1574 }
1575
1576 /* state changes when reader collects event */
1577 event = next_event (dev, GADGETFS_SETUP);
1578 event->u.setup = *ctrl;
1579 ep0_readable (dev);
1580 spin_unlock (&dev->lock);
1581 return 0;
1582 }
1583 }
1584
1585 /* proceed with data transfer and status phases? */
1586 if (value >= 0 && dev->state != STATE_SETUP) {
1587 req->length = value;
1588 req->zero = value < w_length;
1589 value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC);
1590 if (value < 0) {
1591 DBG (dev, "ep_queue --> %d\n", value);
1592 req->status = 0;
1593 }
1594 }
1595
1596 /* device stalls when value < 0 */
1597 spin_unlock (&dev->lock);
1598 return value;
1599 }
1600
1601 static void destroy_ep_files (struct dev_data *dev)
1602 {
1603 struct list_head *entry, *tmp;
1604
1605 DBG (dev, "%s %d\n", __FUNCTION__, dev->state);
1606
1607 /* dev->state must prevent interference */
1608 restart:
1609 spin_lock_irq (&dev->lock);
1610 list_for_each_safe (entry, tmp, &dev->epfiles) {
1611 struct ep_data *ep;
1612 struct inode *parent;
1613 struct dentry *dentry;
1614
1615 /* break link to FS */
1616 ep = list_entry (entry, struct ep_data, epfiles);
1617 list_del_init (&ep->epfiles);
1618 dentry = ep->dentry;
1619 ep->dentry = NULL;
1620 parent = dentry->d_parent->d_inode;
1621
1622 /* break link to controller */
1623 if (ep->state == STATE_EP_ENABLED)
1624 (void) usb_ep_disable (ep->ep);
1625 ep->state = STATE_EP_UNBOUND;
1626 usb_ep_free_request (ep->ep, ep->req);
1627 ep->ep = NULL;
1628 wake_up (&ep->wait);
1629 put_ep (ep);
1630
1631 spin_unlock_irq (&dev->lock);
1632
1633 /* break link to dcache */
1634 mutex_lock (&parent->i_mutex);
1635 d_delete (dentry);
1636 dput (dentry);
1637 mutex_unlock (&parent->i_mutex);
1638
1639 /* fds may still be open */
1640 goto restart;
1641 }
1642 spin_unlock_irq (&dev->lock);
1643 }
1644
1645
1646 static struct inode *
1647 gadgetfs_create_file (struct super_block *sb, char const *name,
1648 void *data, const struct file_operations *fops,
1649 struct dentry **dentry_p);
1650
1651 static int activate_ep_files (struct dev_data *dev)
1652 {
1653 struct usb_ep *ep;
1654 struct ep_data *data;
1655
1656 gadget_for_each_ep (ep, dev->gadget) {
1657
1658 data = kzalloc(sizeof(*data), GFP_KERNEL);
1659 if (!data)
1660 goto enomem0;
1661 data->state = STATE_EP_DISABLED;
1662 init_MUTEX (&data->lock);
1663 init_waitqueue_head (&data->wait);
1664
1665 strncpy (data->name, ep->name, sizeof (data->name) - 1);
1666 atomic_set (&data->count, 1);
1667 data->dev = dev;
1668 get_dev (dev);
1669
1670 data->ep = ep;
1671 ep->driver_data = data;
1672
1673 data->req = usb_ep_alloc_request (ep, GFP_KERNEL);
1674 if (!data->req)
1675 goto enomem1;
1676
1677 data->inode = gadgetfs_create_file (dev->sb, data->name,
1678 data, &ep_config_operations,
1679 &data->dentry);
1680 if (!data->inode)
1681 goto enomem2;
1682 list_add_tail (&data->epfiles, &dev->epfiles);
1683 }
1684 return 0;
1685
1686 enomem2:
1687 usb_ep_free_request (ep, data->req);
1688 enomem1:
1689 put_dev (dev);
1690 kfree (data);
1691 enomem0:
1692 DBG (dev, "%s enomem\n", __FUNCTION__);
1693 destroy_ep_files (dev);
1694 return -ENOMEM;
1695 }
1696
1697 static void
1698 gadgetfs_unbind (struct usb_gadget *gadget)
1699 {
1700 struct dev_data *dev = get_gadget_data (gadget);
1701
1702 DBG (dev, "%s\n", __FUNCTION__);
1703
1704 spin_lock_irq (&dev->lock);
1705 dev->state = STATE_DEV_UNBOUND;
1706 spin_unlock_irq (&dev->lock);
1707
1708 destroy_ep_files (dev);
1709 gadget->ep0->driver_data = NULL;
1710 set_gadget_data (gadget, NULL);
1711
1712 /* we've already been disconnected ... no i/o is active */
1713 if (dev->req)
1714 usb_ep_free_request (gadget->ep0, dev->req);
1715 DBG (dev, "%s done\n", __FUNCTION__);
1716 put_dev (dev);
1717 }
1718
1719 static struct dev_data *the_device;
1720
1721 static int
1722 gadgetfs_bind (struct usb_gadget *gadget)
1723 {
1724 struct dev_data *dev = the_device;
1725
1726 if (!dev)
1727 return -ESRCH;
1728 if (0 != strcmp (CHIP, gadget->name)) {
1729 printk (KERN_ERR "%s expected %s controller not %s\n",
1730 shortname, CHIP, gadget->name);
1731 return -ENODEV;
1732 }
1733
1734 set_gadget_data (gadget, dev);
1735 dev->gadget = gadget;
1736 gadget->ep0->driver_data = dev;
1737 dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket;
1738
1739 /* preallocate control response and buffer */
1740 dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL);
1741 if (!dev->req)
1742 goto enomem;
1743 dev->req->context = NULL;
1744 dev->req->complete = epio_complete;
1745
1746 if (activate_ep_files (dev) < 0)
1747 goto enomem;
1748
1749 INFO (dev, "bound to %s driver\n", gadget->name);
1750 dev->state = STATE_UNCONNECTED;
1751 get_dev (dev);
1752 return 0;
1753
1754 enomem:
1755 gadgetfs_unbind (gadget);
1756 return -ENOMEM;
1757 }
1758
1759 static void
1760 gadgetfs_disconnect (struct usb_gadget *gadget)
1761 {
1762 struct dev_data *dev = get_gadget_data (gadget);
1763
1764 spin_lock (&dev->lock);
1765 if (dev->state == STATE_UNCONNECTED) {
1766 DBG (dev, "already unconnected\n");
1767 goto exit;
1768 }
1769 dev->state = STATE_UNCONNECTED;
1770
1771 INFO (dev, "disconnected\n");
1772 next_event (dev, GADGETFS_DISCONNECT);
1773 ep0_readable (dev);
1774 exit:
1775 spin_unlock (&dev->lock);
1776 }
1777
1778 static void
1779 gadgetfs_suspend (struct usb_gadget *gadget)
1780 {
1781 struct dev_data *dev = get_gadget_data (gadget);
1782
1783 INFO (dev, "suspended from state %d\n", dev->state);
1784 spin_lock (&dev->lock);
1785 switch (dev->state) {
1786 case STATE_SETUP: // VERY odd... host died??
1787 case STATE_CONNECTED:
1788 case STATE_UNCONNECTED:
1789 next_event (dev, GADGETFS_SUSPEND);
1790 ep0_readable (dev);
1791 /* FALLTHROUGH */
1792 default:
1793 break;
1794 }
1795 spin_unlock (&dev->lock);
1796 }
1797
1798 static struct usb_gadget_driver gadgetfs_driver = {
1799 #ifdef CONFIG_USB_GADGET_DUALSPEED
1800 .speed = USB_SPEED_HIGH,
1801 #else
1802 .speed = USB_SPEED_FULL,
1803 #endif
1804 .function = (char *) driver_desc,
1805 .bind = gadgetfs_bind,
1806 .unbind = gadgetfs_unbind,
1807 .setup = gadgetfs_setup,
1808 .disconnect = gadgetfs_disconnect,
1809 .suspend = gadgetfs_suspend,
1810
1811 .driver = {
1812 .name = (char *) shortname,
1813 },
1814 };
1815
1816 /*----------------------------------------------------------------------*/
1817
1818 static void gadgetfs_nop(struct usb_gadget *arg) { }
1819
1820 static int gadgetfs_probe (struct usb_gadget *gadget)
1821 {
1822 CHIP = gadget->name;
1823 return -EISNAM;
1824 }
1825
1826 static struct usb_gadget_driver probe_driver = {
1827 .speed = USB_SPEED_HIGH,
1828 .bind = gadgetfs_probe,
1829 .unbind = gadgetfs_nop,
1830 .setup = (void *)gadgetfs_nop,
1831 .disconnect = gadgetfs_nop,
1832 .driver = {
1833 .name = "nop",
1834 },
1835 };
1836
1837
1838 /* DEVICE INITIALIZATION
1839 *
1840 * fd = open ("/dev/gadget/$CHIP", O_RDWR)
1841 * status = write (fd, descriptors, sizeof descriptors)
1842 *
1843 * That write establishes the device configuration, so the kernel can
1844 * bind to the controller ... guaranteeing it can handle enumeration
1845 * at all necessary speeds. Descriptor order is:
1846 *
1847 * . message tag (u32, host order) ... for now, must be zero; it
1848 * would change to support features like multi-config devices
1849 * . full/low speed config ... all wTotalLength bytes (with interface,
1850 * class, altsetting, endpoint, and other descriptors)
1851 * . high speed config ... all descriptors, for high speed operation;
1852 * this one's optional except for high-speed hardware
1853 * . device descriptor
1854 *
1855 * Endpoints are not yet enabled. Drivers may want to immediately
1856 * initialize them, using the /dev/gadget/ep* files that are available
1857 * as soon as the kernel sees the configuration, or they can wait
1858 * until device configuration and interface altsetting changes create
1859 * the need to configure (or unconfigure) them.
1860 *
1861 * After initialization, the device stays active for as long as that
1862 * $CHIP file is open. Events may then be read from that descriptor,
1863 * such as configuration notifications. More complex drivers will handle
1864 * some control requests in user space.
1865 */
1866
1867 static int is_valid_config (struct usb_config_descriptor *config)
1868 {
1869 return config->bDescriptorType == USB_DT_CONFIG
1870 && config->bLength == USB_DT_CONFIG_SIZE
1871 && config->bConfigurationValue != 0
1872 && (config->bmAttributes & USB_CONFIG_ATT_ONE) != 0
1873 && (config->bmAttributes & USB_CONFIG_ATT_WAKEUP) == 0;
1874 /* FIXME if gadget->is_otg, _must_ include an otg descriptor */
1875 /* FIXME check lengths: walk to end */
1876 }
1877
1878 static ssize_t
1879 dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
1880 {
1881 struct dev_data *dev = fd->private_data;
1882 ssize_t value = len, length = len;
1883 unsigned total;
1884 u32 tag;
1885 char *kbuf;
1886
1887 if (dev->state != STATE_OPENED)
1888 return -EEXIST;
1889
1890 if (len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4))
1891 return -EINVAL;
1892
1893 /* we might need to change message format someday */
1894 if (copy_from_user (&tag, buf, 4))
1895 return -EFAULT;
1896 if (tag != 0)
1897 return -EINVAL;
1898 buf += 4;
1899 length -= 4;
1900
1901 kbuf = kmalloc (length, SLAB_KERNEL);
1902 if (!kbuf)
1903 return -ENOMEM;
1904 if (copy_from_user (kbuf, buf, length)) {
1905 kfree (kbuf);
1906 return -EFAULT;
1907 }
1908
1909 spin_lock_irq (&dev->lock);
1910 value = -EINVAL;
1911 if (dev->buf)
1912 goto fail;
1913 dev->buf = kbuf;
1914
1915 /* full or low speed config */
1916 dev->config = (void *) kbuf;
1917 total = le16_to_cpup (&dev->config->wTotalLength);
1918 if (!is_valid_config (dev->config) || total >= length)
1919 goto fail;
1920 kbuf += total;
1921 length -= total;
1922
1923 /* optional high speed config */
1924 if (kbuf [1] == USB_DT_CONFIG) {
1925 dev->hs_config = (void *) kbuf;
1926 total = le16_to_cpup (&dev->hs_config->wTotalLength);
1927 if (!is_valid_config (dev->hs_config) || total >= length)
1928 goto fail;
1929 kbuf += total;
1930 length -= total;
1931 }
1932
1933 /* could support multiple configs, using another encoding! */
1934
1935 /* device descriptor (tweaked for paranoia) */
1936 if (length != USB_DT_DEVICE_SIZE)
1937 goto fail;
1938 dev->dev = (void *)kbuf;
1939 if (dev->dev->bLength != USB_DT_DEVICE_SIZE
1940 || dev->dev->bDescriptorType != USB_DT_DEVICE
1941 || dev->dev->bNumConfigurations != 1)
1942 goto fail;
1943 dev->dev->bNumConfigurations = 1;
1944 dev->dev->bcdUSB = __constant_cpu_to_le16 (0x0200);
1945
1946 /* triggers gadgetfs_bind(); then we can enumerate. */
1947 spin_unlock_irq (&dev->lock);
1948 value = usb_gadget_register_driver (&gadgetfs_driver);
1949 if (value != 0) {
1950 kfree (dev->buf);
1951 dev->buf = NULL;
1952 } else {
1953 /* at this point "good" hardware has for the first time
1954 * let the USB the host see us. alternatively, if users
1955 * unplug/replug that will clear all the error state.
1956 *
1957 * note: everything running before here was guaranteed
1958 * to choke driver model style diagnostics. from here
1959 * on, they can work ... except in cleanup paths that
1960 * kick in after the ep0 descriptor is closed.
1961 */
1962 fd->f_op = &ep0_io_operations;
1963 value = len;
1964 }
1965 return value;
1966
1967 fail:
1968 spin_unlock_irq (&dev->lock);
1969 pr_debug ("%s: %s fail %Zd, %p\n", shortname, __FUNCTION__, value, dev);
1970 kfree (dev->buf);
1971 dev->buf = NULL;
1972 return value;
1973 }
1974
1975 static int
1976 dev_open (struct inode *inode, struct file *fd)
1977 {
1978 struct dev_data *dev = inode->i_private;
1979 int value = -EBUSY;
1980
1981 if (dev->state == STATE_DEV_DISABLED) {
1982 dev->ev_next = 0;
1983 dev->state = STATE_OPENED;
1984 fd->private_data = dev;
1985 get_dev (dev);
1986 value = 0;
1987 }
1988 return value;
1989 }
1990
1991 static const struct file_operations dev_init_operations = {
1992 .owner = THIS_MODULE,
1993 .llseek = no_llseek,
1994
1995 .open = dev_open,
1996 .write = dev_config,
1997 .fasync = ep0_fasync,
1998 .ioctl = dev_ioctl,
1999 .release = dev_release,
2000 };
2001
2002 /*----------------------------------------------------------------------*/
2003
2004 /* FILESYSTEM AND SUPERBLOCK OPERATIONS
2005 *
2006 * Mounting the filesystem creates a controller file, used first for
2007 * device configuration then later for event monitoring.
2008 */
2009
2010
2011 /* FIXME PAM etc could set this security policy without mount options
2012 * if epfiles inherited ownership and permissons from ep0 ...
2013 */
2014
2015 static unsigned default_uid;
2016 static unsigned default_gid;
2017 static unsigned default_perm = S_IRUSR | S_IWUSR;
2018
2019 module_param (default_uid, uint, 0644);
2020 module_param (default_gid, uint, 0644);
2021 module_param (default_perm, uint, 0644);
2022
2023
2024 static struct inode *
2025 gadgetfs_make_inode (struct super_block *sb,
2026 void *data, const struct file_operations *fops,
2027 int mode)
2028 {
2029 struct inode *inode = new_inode (sb);
2030
2031 if (inode) {
2032 inode->i_mode = mode;
2033 inode->i_uid = default_uid;
2034 inode->i_gid = default_gid;
2035 inode->i_blocks = 0;
2036 inode->i_atime = inode->i_mtime = inode->i_ctime
2037 = CURRENT_TIME;
2038 inode->i_private = data;
2039 inode->i_fop = fops;
2040 }
2041 return inode;
2042 }
2043
2044 /* creates in fs root directory, so non-renamable and non-linkable.
2045 * so inode and dentry are paired, until device reconfig.
2046 */
2047 static struct inode *
2048 gadgetfs_create_file (struct super_block *sb, char const *name,
2049 void *data, const struct file_operations *fops,
2050 struct dentry **dentry_p)
2051 {
2052 struct dentry *dentry;
2053 struct inode *inode;
2054
2055 dentry = d_alloc_name(sb->s_root, name);
2056 if (!dentry)
2057 return NULL;
2058
2059 inode = gadgetfs_make_inode (sb, data, fops,
2060 S_IFREG | (default_perm & S_IRWXUGO));
2061 if (!inode) {
2062 dput(dentry);
2063 return NULL;
2064 }
2065 d_add (dentry, inode);
2066 *dentry_p = dentry;
2067 return inode;
2068 }
2069
2070 static struct super_operations gadget_fs_operations = {
2071 .statfs = simple_statfs,
2072 .drop_inode = generic_delete_inode,
2073 };
2074
2075 static int
2076 gadgetfs_fill_super (struct super_block *sb, void *opts, int silent)
2077 {
2078 struct inode *inode;
2079 struct dentry *d;
2080 struct dev_data *dev;
2081
2082 if (the_device)
2083 return -ESRCH;
2084
2085 /* fake probe to determine $CHIP */
2086 (void) usb_gadget_register_driver (&probe_driver);
2087 if (!CHIP)
2088 return -ENODEV;
2089
2090 /* superblock */
2091 sb->s_blocksize = PAGE_CACHE_SIZE;
2092 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2093 sb->s_magic = GADGETFS_MAGIC;
2094 sb->s_op = &gadget_fs_operations;
2095 sb->s_time_gran = 1;
2096
2097 /* root inode */
2098 inode = gadgetfs_make_inode (sb,
2099 NULL, &simple_dir_operations,
2100 S_IFDIR | S_IRUGO | S_IXUGO);
2101 if (!inode)
2102 goto enomem0;
2103 inode->i_op = &simple_dir_inode_operations;
2104 if (!(d = d_alloc_root (inode)))
2105 goto enomem1;
2106 sb->s_root = d;
2107
2108 /* the ep0 file is named after the controller we expect;
2109 * user mode code can use it for sanity checks, like we do.
2110 */
2111 dev = dev_new ();
2112 if (!dev)
2113 goto enomem2;
2114
2115 dev->sb = sb;
2116 if (!gadgetfs_create_file (sb, CHIP,
2117 dev, &dev_init_operations,
2118 &dev->dentry))
2119 goto enomem3;
2120
2121 /* other endpoint files are available after hardware setup,
2122 * from binding to a controller.
2123 */
2124 the_device = dev;
2125 return 0;
2126
2127 enomem3:
2128 put_dev (dev);
2129 enomem2:
2130 dput (d);
2131 enomem1:
2132 iput (inode);
2133 enomem0:
2134 return -ENOMEM;
2135 }
2136
2137 /* "mount -t gadgetfs path /dev/gadget" ends up here */
2138 static int
2139 gadgetfs_get_sb (struct file_system_type *t, int flags,
2140 const char *path, void *opts, struct vfsmount *mnt)
2141 {
2142 return get_sb_single (t, flags, opts, gadgetfs_fill_super, mnt);
2143 }
2144
2145 static void
2146 gadgetfs_kill_sb (struct super_block *sb)
2147 {
2148 kill_litter_super (sb);
2149 if (the_device) {
2150 put_dev (the_device);
2151 the_device = NULL;
2152 }
2153 }
2154
2155 /*----------------------------------------------------------------------*/
2156
2157 static struct file_system_type gadgetfs_type = {
2158 .owner = THIS_MODULE,
2159 .name = shortname,
2160 .get_sb = gadgetfs_get_sb,
2161 .kill_sb = gadgetfs_kill_sb,
2162 };
2163
2164 /*----------------------------------------------------------------------*/
2165
2166 static int __init init (void)
2167 {
2168 int status;
2169
2170 status = register_filesystem (&gadgetfs_type);
2171 if (status == 0)
2172 pr_info ("%s: %s, version " DRIVER_VERSION "\n",
2173 shortname, driver_desc);
2174 return status;
2175 }
2176 module_init (init);
2177
2178 static void __exit cleanup (void)
2179 {
2180 pr_debug ("unregister %s\n", shortname);
2181 unregister_filesystem (&gadgetfs_type);
2182 }
2183 module_exit (cleanup);
2184
kernel source for telekom puls (alcatel/mediatek)