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[PATCH] x86_64 early quirks: fix early_qrk[] section tag
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / usb / gadget / inode.c
blob188c74a95216860cb1740243211b94ef013cbddd
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/$CHIP is configured
58 * (by writing configuration and device descriptors). Afterwards it
59 * may serve as a source of device events, used to handle all control
60 * requests other than basic enumeration.
61 *
62 * - Then, after a SET_CONFIGURATION control request, ep_config() is
63 * called when each /dev/gadget/ep* file is configured (by writing
64 * endpoint descriptors). Afterwards these files are used to write()
65 * IN data or to read() OUT data. To halt the endpoint, a "wrong
66 * direction" request is issued (like reading an IN endpoint).
67 *
68 * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe
69 * not possible on all hardware. For example, precise fault handling with
70 * respect to data left in endpoint fifos after aborted operations; or
71 * selective clearing of endpoint halts, to implement SET_INTERFACE.
72 */
73
74 #define DRIVER_DESC "USB Gadget filesystem"
75 #define DRIVER_VERSION "24 Aug 2004"
76
77 static const char driver_desc [] = DRIVER_DESC;
78 static const char shortname [] = "gadgetfs";
79
80 MODULE_DESCRIPTION (DRIVER_DESC);
81 MODULE_AUTHOR ("David Brownell");
82 MODULE_LICENSE ("GPL");
83
84
85 /*----------------------------------------------------------------------*/
86
87 #define GADGETFS_MAGIC 0xaee71ee7
88 #define DMA_ADDR_INVALID (~(dma_addr_t)0)
89
90 /* /dev/gadget/$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_DEV_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_DEV_UNCONNECTED,
109 STATE_DEV_CONNECTED,
110 STATE_DEV_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; /* P: lock */
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_ENABLED,
192 STATE_EP_UNBOUND,
193 };
194
195 struct ep_data {
196 struct semaphore lock;
197 enum ep_state state;
198 atomic_t count;
199 struct dev_data *dev;
200 /* must hold dev->lock before accessing ep or req */
201 struct usb_ep *ep;
202 struct usb_request *req;
203 ssize_t status;
204 char name [16];
205 struct usb_endpoint_descriptor desc, hs_desc;
206 struct list_head epfiles;
207 wait_queue_head_t wait;
208 struct dentry *dentry;
209 struct inode *inode;
210 };
211
212 static inline void get_ep (struct ep_data *data)
213 {
214 atomic_inc (&data->count);
215 }
216
217 static void put_ep (struct ep_data *data)
218 {
219 if (likely (!atomic_dec_and_test (&data->count)))
220 return;
221 put_dev (data->dev);
222 /* needs no more cleanup */
223 BUG_ON (!list_empty (&data->epfiles));
224 BUG_ON (waitqueue_active (&data->wait));
225 kfree (data);
226 }
227
228 /*----------------------------------------------------------------------*/
229
230 /* most "how to use the hardware" policy choices are in userspace:
231 * mapping endpoint roles (which the driver needs) to the capabilities
232 * which the usb controller has. most of those capabilities are exposed
233 * implicitly, starting with the driver name and then endpoint names.
234 */
235
236 static const char *CHIP;
237
238 /*----------------------------------------------------------------------*/
239
240 /* NOTE: don't use dev_printk calls before binding to the gadget
241 * at the end of ep0 configuration, or after unbind.
242 */
243
244 /* too wordy: dev_printk(level , &(d)->gadget->dev , fmt , ## args) */
245 #define xprintk(d,level,fmt,args...) \
246 printk(level "%s: " fmt , shortname , ## args)
247
248 #ifdef DEBUG
249 #define DBG(dev,fmt,args...) \
250 xprintk(dev , KERN_DEBUG , fmt , ## args)
251 #else
252 #define DBG(dev,fmt,args...) \
253 do { } while (0)
254 #endif /* DEBUG */
255
256 #ifdef VERBOSE
257 #define VDEBUG DBG
258 #else
259 #define VDEBUG(dev,fmt,args...) \
260 do { } while (0)
261 #endif /* DEBUG */
262
263 #define ERROR(dev,fmt,args...) \
264 xprintk(dev , KERN_ERR , fmt , ## args)
265 #define WARN(dev,fmt,args...) \
266 xprintk(dev , KERN_WARNING , fmt , ## args)
267 #define INFO(dev,fmt,args...) \
268 xprintk(dev , KERN_INFO , fmt , ## args)
269
270
271 /*----------------------------------------------------------------------*/
272
273 /* SYNCHRONOUS ENDPOINT OPERATIONS (bulk/intr/iso)
274 *
275 * After opening, configure non-control endpoints. Then use normal
276 * stream read() and write() requests; and maybe ioctl() to get more
277 * precise FIFO status when recovering from cancellation.
278 */
279
280 static void epio_complete (struct usb_ep *ep, struct usb_request *req)
281 {
282 struct ep_data *epdata = ep->driver_data;
283
284 if (!req->context)
285 return;
286 if (req->status)
287 epdata->status = req->status;
288 else
289 epdata->status = req->actual;
290 complete ((struct completion *)req->context);
291 }
292
293 /* tasklock endpoint, returning when it's connected.
294 * still need dev->lock to use epdata->ep.
295 */
296 static int
297 get_ready_ep (unsigned f_flags, struct ep_data *epdata)
298 {
299 int val;
300
301 if (f_flags & O_NONBLOCK) {
302 if (down_trylock (&epdata->lock) != 0)
303 goto nonblock;
304 if (epdata->state != STATE_EP_ENABLED) {
305 up (&epdata->lock);
306 nonblock:
307 val = -EAGAIN;
308 } else
309 val = 0;
310 return val;
311 }
312
313 if ((val = down_interruptible (&epdata->lock)) < 0)
314 return val;
315
316 switch (epdata->state) {
317 case STATE_EP_ENABLED:
318 break;
319 // case STATE_EP_DISABLED: /* "can't happen" */
320 // case STATE_EP_READY: /* "can't happen" */
321 default: /* error! */
322 pr_debug ("%s: ep %p not available, state %d\n",
323 shortname, epdata, epdata->state);
324 // FALLTHROUGH
325 case STATE_EP_UNBOUND: /* clean disconnect */
326 val = -ENODEV;
327 up (&epdata->lock);
328 }
329 return val;
330 }
331
332 static ssize_t
333 ep_io (struct ep_data *epdata, void *buf, unsigned len)
334 {
335 DECLARE_COMPLETION_ONSTACK (done);
336 int value;
337
338 spin_lock_irq (&epdata->dev->lock);
339 if (likely (epdata->ep != NULL)) {
340 struct usb_request *req = epdata->req;
341
342 req->context = &done;
343 req->complete = epio_complete;
344 req->buf = buf;
345 req->length = len;
346 value = usb_ep_queue (epdata->ep, req, GFP_ATOMIC);
347 } else
348 value = -ENODEV;
349 spin_unlock_irq (&epdata->dev->lock);
350
351 if (likely (value == 0)) {
352 value = wait_event_interruptible (done.wait, done.done);
353 if (value != 0) {
354 spin_lock_irq (&epdata->dev->lock);
355 if (likely (epdata->ep != NULL)) {
356 DBG (epdata->dev, "%s i/o interrupted\n",
357 epdata->name);
358 usb_ep_dequeue (epdata->ep, epdata->req);
359 spin_unlock_irq (&epdata->dev->lock);
360
361 wait_event (done.wait, done.done);
362 if (epdata->status == -ECONNRESET)
363 epdata->status = -EINTR;
364 } else {
365 spin_unlock_irq (&epdata->dev->lock);
366
367 DBG (epdata->dev, "endpoint gone\n");
368 epdata->status = -ENODEV;
369 }
370 }
371 return epdata->status;
372 }
373 return value;
374 }
375
376
377 /* handle a synchronous OUT bulk/intr/iso transfer */
378 static ssize_t
379 ep_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
380 {
381 struct ep_data *data = fd->private_data;
382 void *kbuf;
383 ssize_t value;
384
385 if ((value = get_ready_ep (fd->f_flags, data)) < 0)
386 return value;
387
388 /* halt any endpoint by doing a "wrong direction" i/o call */
389 if (data->desc.bEndpointAddress & USB_DIR_IN) {
390 if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
391 == USB_ENDPOINT_XFER_ISOC)
392 return -EINVAL;
393 DBG (data->dev, "%s halt\n", data->name);
394 spin_lock_irq (&data->dev->lock);
395 if (likely (data->ep != NULL))
396 usb_ep_set_halt (data->ep);
397 spin_unlock_irq (&data->dev->lock);
398 up (&data->lock);
399 return -EBADMSG;
400 }
401
402 /* FIXME readahead for O_NONBLOCK and poll(); careful with ZLPs */
403
404 value = -ENOMEM;
405 kbuf = kmalloc (len, GFP_KERNEL);
406 if (unlikely (!kbuf))
407 goto free1;
408
409 value = ep_io (data, kbuf, len);
410 VDEBUG (data->dev, "%s read %zu OUT, status %d\n",
411 data->name, len, (int) value);
412 if (value >= 0 && copy_to_user (buf, kbuf, value))
413 value = -EFAULT;
414
415 free1:
416 up (&data->lock);
417 kfree (kbuf);
418 return value;
419 }
420
421 /* handle a synchronous IN bulk/intr/iso transfer */
422 static ssize_t
423 ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
424 {
425 struct ep_data *data = fd->private_data;
426 void *kbuf;
427 ssize_t value;
428
429 if ((value = get_ready_ep (fd->f_flags, data)) < 0)
430 return value;
431
432 /* halt any endpoint by doing a "wrong direction" i/o call */
433 if (!(data->desc.bEndpointAddress & USB_DIR_IN)) {
434 if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
435 == USB_ENDPOINT_XFER_ISOC)
436 return -EINVAL;
437 DBG (data->dev, "%s halt\n", data->name);
438 spin_lock_irq (&data->dev->lock);
439 if (likely (data->ep != NULL))
440 usb_ep_set_halt (data->ep);
441 spin_unlock_irq (&data->dev->lock);
442 up (&data->lock);
443 return -EBADMSG;
444 }
445
446 /* FIXME writebehind for O_NONBLOCK and poll(), qlen = 1 */
447
448 value = -ENOMEM;
449 kbuf = kmalloc (len, GFP_KERNEL);
450 if (!kbuf)
451 goto free1;
452 if (copy_from_user (kbuf, buf, len)) {
453 value = -EFAULT;
454 goto free1;
455 }
456
457 value = ep_io (data, kbuf, len);
458 VDEBUG (data->dev, "%s write %zu IN, status %d\n",
459 data->name, len, (int) value);
460 free1:
461 up (&data->lock);
462 kfree (kbuf);
463 return value;
464 }
465
466 static int
467 ep_release (struct inode *inode, struct file *fd)
468 {
469 struct ep_data *data = fd->private_data;
470 int value;
471
472 if ((value = down_interruptible(&data->lock)) < 0)
473 return value;
474
475 /* clean up if this can be reopened */
476 if (data->state != STATE_EP_UNBOUND) {
477 data->state = STATE_EP_DISABLED;
478 data->desc.bDescriptorType = 0;
479 data->hs_desc.bDescriptorType = 0;
480 usb_ep_disable(data->ep);
481 }
482 up (&data->lock);
483 put_ep (data);
484 return 0;
485 }
486
487 static int ep_ioctl (struct inode *inode, struct file *fd,
488 unsigned code, unsigned long value)
489 {
490 struct ep_data *data = fd->private_data;
491 int status;
492
493 if ((status = get_ready_ep (fd->f_flags, data)) < 0)
494 return status;
495
496 spin_lock_irq (&data->dev->lock);
497 if (likely (data->ep != NULL)) {
498 switch (code) {
499 case GADGETFS_FIFO_STATUS:
500 status = usb_ep_fifo_status (data->ep);
501 break;
502 case GADGETFS_FIFO_FLUSH:
503 usb_ep_fifo_flush (data->ep);
504 break;
505 case GADGETFS_CLEAR_HALT:
506 status = usb_ep_clear_halt (data->ep);
507 break;
508 default:
509 status = -ENOTTY;
510 }
511 } else
512 status = -ENODEV;
513 spin_unlock_irq (&data->dev->lock);
514 up (&data->lock);
515 return status;
516 }
517
518 /*----------------------------------------------------------------------*/
519
520 /* ASYNCHRONOUS ENDPOINT I/O OPERATIONS (bulk/intr/iso) */
521
522 struct kiocb_priv {
523 struct usb_request *req;
524 struct ep_data *epdata;
525 void *buf;
526 const struct iovec *iv;
527 unsigned long nr_segs;
528 unsigned actual;
529 };
530
531 static int ep_aio_cancel(struct kiocb *iocb, struct io_event *e)
532 {
533 struct kiocb_priv *priv = iocb->private;
534 struct ep_data *epdata;
535 int value;
536
537 local_irq_disable();
538 epdata = priv->epdata;
539 // spin_lock(&epdata->dev->lock);
540 kiocbSetCancelled(iocb);
541 if (likely(epdata && epdata->ep && priv->req))
542 value = usb_ep_dequeue (epdata->ep, priv->req);
543 else
544 value = -EINVAL;
545 // spin_unlock(&epdata->dev->lock);
546 local_irq_enable();
547
548 aio_put_req(iocb);
549 return value;
550 }
551
552 static ssize_t ep_aio_read_retry(struct kiocb *iocb)
553 {
554 struct kiocb_priv *priv = iocb->private;
555 ssize_t len, total;
556 void *to_copy;
557 int i;
558
559 /* we "retry" to get the right mm context for this: */
560
561 /* copy stuff into user buffers */
562 total = priv->actual;
563 len = 0;
564 to_copy = priv->buf;
565 for (i=0; i < priv->nr_segs; i++) {
566 ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total);
567
568 if (copy_to_user(priv->iv[i].iov_base, to_copy, this)) {
569 if (len == 0)
570 len = -EFAULT;
571 break;
572 }
573
574 total -= this;
575 len += this;
576 to_copy += this;
577 if (total == 0)
578 break;
579 }
580 kfree(priv->buf);
581 kfree(priv);
582 return len;
583 }
584
585 static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req)
586 {
587 struct kiocb *iocb = req->context;
588 struct kiocb_priv *priv = iocb->private;
589 struct ep_data *epdata = priv->epdata;
590
591 /* lock against disconnect (and ideally, cancel) */
592 spin_lock(&epdata->dev->lock);
593 priv->req = NULL;
594 priv->epdata = NULL;
595
596 /* if this was a write or a read returning no data then we
597 * don't need to copy anything to userspace, so we can
598 * complete the aio request immediately.
599 */
600 if (priv->iv == NULL || unlikely(req->actual == 0)) {
601 kfree(req->buf);
602 kfree(priv);
603 iocb->private = NULL;
604 /* aio_complete() reports bytes-transferred _and_ faults */
605 aio_complete(iocb, req->actual ? req->actual : req->status,
606 req->status);
607 } else {
608 /* retry() won't report both; so we hide some faults */
609 if (unlikely(0 != req->status))
610 DBG(epdata->dev, "%s fault %d len %d\n",
611 ep->name, req->status, req->actual);
612
613 priv->buf = req->buf;
614 priv->actual = req->actual;
615 kick_iocb(iocb);
616 }
617 spin_unlock(&epdata->dev->lock);
618
619 usb_ep_free_request(ep, req);
620 put_ep(epdata);
621 }
622
623 static ssize_t
624 ep_aio_rwtail(
625 struct kiocb *iocb,
626 char *buf,
627 size_t len,
628 struct ep_data *epdata,
629 const struct iovec *iv,
630 unsigned long nr_segs
631 )
632 {
633 struct kiocb_priv *priv;
634 struct usb_request *req;
635 ssize_t value;
636
637 priv = kmalloc(sizeof *priv, GFP_KERNEL);
638 if (!priv) {
639 value = -ENOMEM;
640 fail:
641 kfree(buf);
642 return value;
643 }
644 iocb->private = priv;
645 priv->iv = iv;
646 priv->nr_segs = nr_segs;
647
648 value = get_ready_ep(iocb->ki_filp->f_flags, epdata);
649 if (unlikely(value < 0)) {
650 kfree(priv);
651 goto fail;
652 }
653
654 iocb->ki_cancel = ep_aio_cancel;
655 get_ep(epdata);
656 priv->epdata = epdata;
657 priv->actual = 0;
658
659 /* each kiocb is coupled to one usb_request, but we can't
660 * allocate or submit those if the host disconnected.
661 */
662 spin_lock_irq(&epdata->dev->lock);
663 if (likely(epdata->ep)) {
664 req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC);
665 if (likely(req)) {
666 priv->req = req;
667 req->buf = buf;
668 req->length = len;
669 req->complete = ep_aio_complete;
670 req->context = iocb;
671 value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC);
672 if (unlikely(0 != value))
673 usb_ep_free_request(epdata->ep, req);
674 } else
675 value = -EAGAIN;
676 } else
677 value = -ENODEV;
678 spin_unlock_irq(&epdata->dev->lock);
679
680 up(&epdata->lock);
681
682 if (unlikely(value)) {
683 kfree(priv);
684 put_ep(epdata);
685 } else
686 value = (iv ? -EIOCBRETRY : -EIOCBQUEUED);
687 return value;
688 }
689
690 static ssize_t
691 ep_aio_read(struct kiocb *iocb, const struct iovec *iov,
692 unsigned long nr_segs, loff_t o)
693 {
694 struct ep_data *epdata = iocb->ki_filp->private_data;
695 char *buf;
696
697 if (unlikely(epdata->desc.bEndpointAddress & USB_DIR_IN))
698 return -EINVAL;
699
700 buf = kmalloc(iocb->ki_left, GFP_KERNEL);
701 if (unlikely(!buf))
702 return -ENOMEM;
703
704 iocb->ki_retry = ep_aio_read_retry;
705 return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs);
706 }
707
708 static ssize_t
709 ep_aio_write(struct kiocb *iocb, const struct iovec *iov,
710 unsigned long nr_segs, loff_t o)
711 {
712 struct ep_data *epdata = iocb->ki_filp->private_data;
713 char *buf;
714 size_t len = 0;
715 int i = 0;
716
717 if (unlikely(!(epdata->desc.bEndpointAddress & USB_DIR_IN)))
718 return -EINVAL;
719
720 buf = kmalloc(iocb->ki_left, GFP_KERNEL);
721 if (unlikely(!buf))
722 return -ENOMEM;
723
724 for (i=0; i < nr_segs; i++) {
725 if (unlikely(copy_from_user(&buf[len], iov[i].iov_base,
726 iov[i].iov_len) != 0)) {
727 kfree(buf);
728 return -EFAULT;
729 }
730 len += iov[i].iov_len;
731 }
732 return ep_aio_rwtail(iocb, buf, len, epdata, NULL, 0);
733 }
734
735 /*----------------------------------------------------------------------*/
736
737 /* used after endpoint configuration */
738 static const struct file_operations ep_io_operations = {
739 .owner = THIS_MODULE,
740 .llseek = no_llseek,
741
742 .read = ep_read,
743 .write = ep_write,
744 .ioctl = ep_ioctl,
745 .release = ep_release,
746
747 .aio_read = ep_aio_read,
748 .aio_write = ep_aio_write,
749 };
750
751 /* ENDPOINT INITIALIZATION
752 *
753 * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR)
754 * status = write (fd, descriptors, sizeof descriptors)
755 *
756 * That write establishes the endpoint configuration, configuring
757 * the controller to process bulk, interrupt, or isochronous transfers
758 * at the right maxpacket size, and so on.
759 *
760 * The descriptors are message type 1, identified by a host order u32
761 * at the beginning of what's written. Descriptor order is: full/low
762 * speed descriptor, then optional high speed descriptor.
763 */
764 static ssize_t
765 ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
766 {
767 struct ep_data *data = fd->private_data;
768 struct usb_ep *ep;
769 u32 tag;
770 int value, length = len;
771
772 if ((value = down_interruptible (&data->lock)) < 0)
773 return value;
774
775 if (data->state != STATE_EP_READY) {
776 value = -EL2HLT;
777 goto fail;
778 }
779
780 value = len;
781 if (len < USB_DT_ENDPOINT_SIZE + 4)
782 goto fail0;
783
784 /* we might need to change message format someday */
785 if (copy_from_user (&tag, buf, 4)) {
786 goto fail1;
787 }
788 if (tag != 1) {
789 DBG(data->dev, "config %s, bad tag %d\n", data->name, tag);
790 goto fail0;
791 }
792 buf += 4;
793 len -= 4;
794
795 /* NOTE: audio endpoint extensions not accepted here;
796 * just don't include the extra bytes.
797 */
798
799 /* full/low speed descriptor, then high speed */
800 if (copy_from_user (&data->desc, buf, USB_DT_ENDPOINT_SIZE)) {
801 goto fail1;
802 }
803 if (data->desc.bLength != USB_DT_ENDPOINT_SIZE
804 || data->desc.bDescriptorType != USB_DT_ENDPOINT)
805 goto fail0;
806 if (len != USB_DT_ENDPOINT_SIZE) {
807 if (len != 2 * USB_DT_ENDPOINT_SIZE)
808 goto fail0;
809 if (copy_from_user (&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE,
810 USB_DT_ENDPOINT_SIZE)) {
811 goto fail1;
812 }
813 if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE
814 || data->hs_desc.bDescriptorType
815 != USB_DT_ENDPOINT) {
816 DBG(data->dev, "config %s, bad hs length or type\n",
817 data->name);
818 goto fail0;
819 }
820 }
821
822 spin_lock_irq (&data->dev->lock);
823 if (data->dev->state == STATE_DEV_UNBOUND) {
824 value = -ENOENT;
825 goto gone;
826 } else if ((ep = data->ep) == NULL) {
827 value = -ENODEV;
828 goto gone;
829 }
830 switch (data->dev->gadget->speed) {
831 case USB_SPEED_LOW:
832 case USB_SPEED_FULL:
833 value = usb_ep_enable (ep, &data->desc);
834 if (value == 0)
835 data->state = STATE_EP_ENABLED;
836 break;
837 #ifdef CONFIG_USB_GADGET_DUALSPEED
838 case USB_SPEED_HIGH:
839 /* fails if caller didn't provide that descriptor... */
840 value = usb_ep_enable (ep, &data->hs_desc);
841 if (value == 0)
842 data->state = STATE_EP_ENABLED;
843 break;
844 #endif
845 default:
846 DBG(data->dev, "unconnected, %s init abandoned\n",
847 data->name);
848 value = -EINVAL;
849 }
850 if (value == 0) {
851 fd->f_op = &ep_io_operations;
852 value = length;
853 }
854 gone:
855 spin_unlock_irq (&data->dev->lock);
856 if (value < 0) {
857 fail:
858 data->desc.bDescriptorType = 0;
859 data->hs_desc.bDescriptorType = 0;
860 }
861 up (&data->lock);
862 return value;
863 fail0:
864 value = -EINVAL;
865 goto fail;
866 fail1:
867 value = -EFAULT;
868 goto fail;
869 }
870
871 static int
872 ep_open (struct inode *inode, struct file *fd)
873 {
874 struct ep_data *data = inode->i_private;
875 int value = -EBUSY;
876
877 if (down_interruptible (&data->lock) != 0)
878 return -EINTR;
879 spin_lock_irq (&data->dev->lock);
880 if (data->dev->state == STATE_DEV_UNBOUND)
881 value = -ENOENT;
882 else if (data->state == STATE_EP_DISABLED) {
883 value = 0;
884 data->state = STATE_EP_READY;
885 get_ep (data);
886 fd->private_data = data;
887 VDEBUG (data->dev, "%s ready\n", data->name);
888 } else
889 DBG (data->dev, "%s state %d\n",
890 data->name, data->state);
891 spin_unlock_irq (&data->dev->lock);
892 up (&data->lock);
893 return value;
894 }
895
896 /* used before endpoint configuration */
897 static const struct file_operations ep_config_operations = {
898 .owner = THIS_MODULE,
899 .llseek = no_llseek,
900
901 .open = ep_open,
902 .write = ep_config,
903 .release = ep_release,
904 };
905
906 /*----------------------------------------------------------------------*/
907
908 /* EP0 IMPLEMENTATION can be partly in userspace.
909 *
910 * Drivers that use this facility receive various events, including
911 * control requests the kernel doesn't handle. Drivers that don't
912 * use this facility may be too simple-minded for real applications.
913 */
914
915 static inline void ep0_readable (struct dev_data *dev)
916 {
917 wake_up (&dev->wait);
918 kill_fasync (&dev->fasync, SIGIO, POLL_IN);
919 }
920
921 static void clean_req (struct usb_ep *ep, struct usb_request *req)
922 {
923 struct dev_data *dev = ep->driver_data;
924
925 if (req->buf != dev->rbuf) {
926 usb_ep_free_buffer (ep, req->buf, req->dma, req->length);
927 req->buf = dev->rbuf;
928 req->dma = DMA_ADDR_INVALID;
929 }
930 req->complete = epio_complete;
931 dev->setup_out_ready = 0;
932 }
933
934 static void ep0_complete (struct usb_ep *ep, struct usb_request *req)
935 {
936 struct dev_data *dev = ep->driver_data;
937 unsigned long flags;
938 int free = 1;
939
940 /* for control OUT, data must still get to userspace */
941 spin_lock_irqsave(&dev->lock, flags);
942 if (!dev->setup_in) {
943 dev->setup_out_error = (req->status != 0);
944 if (!dev->setup_out_error)
945 free = 0;
946 dev->setup_out_ready = 1;
947 ep0_readable (dev);
948 }
949
950 /* clean up as appropriate */
951 if (free && req->buf != &dev->rbuf)
952 clean_req (ep, req);
953 req->complete = epio_complete;
954 spin_unlock_irqrestore(&dev->lock, flags);
955 }
956
957 static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len)
958 {
959 struct dev_data *dev = ep->driver_data;
960
961 if (dev->setup_out_ready) {
962 DBG (dev, "ep0 request busy!\n");
963 return -EBUSY;
964 }
965 if (len > sizeof (dev->rbuf))
966 req->buf = usb_ep_alloc_buffer (ep, len, &req->dma, GFP_ATOMIC);
967 if (req->buf == 0) {
968 req->buf = dev->rbuf;
969 return -ENOMEM;
970 }
971 req->complete = ep0_complete;
972 req->length = len;
973 req->zero = 0;
974 return 0;
975 }
976
977 static ssize_t
978 ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
979 {
980 struct dev_data *dev = fd->private_data;
981 ssize_t retval;
982 enum ep0_state state;
983
984 spin_lock_irq (&dev->lock);
985
986 /* report fd mode change before acting on it */
987 if (dev->setup_abort) {
988 dev->setup_abort = 0;
989 retval = -EIDRM;
990 goto done;
991 }
992
993 /* control DATA stage */
994 if ((state = dev->state) == STATE_DEV_SETUP) {
995
996 if (dev->setup_in) { /* stall IN */
997 VDEBUG(dev, "ep0in stall\n");
998 (void) usb_ep_set_halt (dev->gadget->ep0);
999 retval = -EL2HLT;
1000 dev->state = STATE_DEV_CONNECTED;
1001
1002 } else if (len == 0) { /* ack SET_CONFIGURATION etc */
1003 struct usb_ep *ep = dev->gadget->ep0;
1004 struct usb_request *req = dev->req;
1005
1006 if ((retval = setup_req (ep, req, 0)) == 0)
1007 retval = usb_ep_queue (ep, req, GFP_ATOMIC);
1008 dev->state = STATE_DEV_CONNECTED;
1009
1010 /* assume that was SET_CONFIGURATION */
1011 if (dev->current_config) {
1012 unsigned power;
1013 #ifdef CONFIG_USB_GADGET_DUALSPEED
1014 if (dev->gadget->speed == USB_SPEED_HIGH)
1015 power = dev->hs_config->bMaxPower;
1016 else
1017 #endif
1018 power = dev->config->bMaxPower;
1019 usb_gadget_vbus_draw(dev->gadget, 2 * power);
1020 }
1021
1022 } else { /* collect OUT data */
1023 if ((fd->f_flags & O_NONBLOCK) != 0
1024 && !dev->setup_out_ready) {
1025 retval = -EAGAIN;
1026 goto done;
1027 }
1028 spin_unlock_irq (&dev->lock);
1029 retval = wait_event_interruptible (dev->wait,
1030 dev->setup_out_ready != 0);
1031
1032 /* FIXME state could change from under us */
1033 spin_lock_irq (&dev->lock);
1034 if (retval)
1035 goto done;
1036
1037 if (dev->state != STATE_DEV_SETUP) {
1038 retval = -ECANCELED;
1039 goto done;
1040 }
1041 dev->state = STATE_DEV_CONNECTED;
1042
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
1070 n = len / sizeof (struct usb_gadgetfs_event);
1071 if (dev->ev_next < n)
1072 n = dev->ev_next;
1073
1074 /* ep0 i/o has special semantics during STATE_DEV_SETUP */
1075 for (i = 0; i < n; i++) {
1076 if (dev->event [i].type == GADGETFS_SETUP) {
1077 dev->state = STATE_DEV_SETUP;
1078 n = i + 1;
1079 break;
1080 }
1081 }
1082 spin_unlock_irq (&dev->lock);
1083 len = n * sizeof (struct usb_gadgetfs_event);
1084 if (copy_to_user (buf, &dev->event, len))
1085 retval = -EFAULT;
1086 else
1087 retval = len;
1088 if (len > 0) {
1089 /* NOTE this doesn't guard against broken drivers;
1090 * concurrent ep0 readers may lose events.
1091 */
1092 spin_lock_irq (&dev->lock);
1093 if (dev->ev_next > n) {
1094 memmove(&dev->event[0], &dev->event[n],
1095 sizeof (struct usb_gadgetfs_event)
1096 * (dev->ev_next - n));
1097 }
1098 dev->ev_next -= n;
1099 spin_unlock_irq (&dev->lock);
1100 }
1101 return retval;
1102 }
1103 if (fd->f_flags & O_NONBLOCK) {
1104 retval = -EAGAIN;
1105 goto done;
1106 }
1107
1108 switch (state) {
1109 default:
1110 DBG (dev, "fail %s, state %d\n", __FUNCTION__, state);
1111 retval = -ESRCH;
1112 break;
1113 case STATE_DEV_UNCONNECTED:
1114 case STATE_DEV_CONNECTED:
1115 spin_unlock_irq (&dev->lock);
1116 DBG (dev, "%s wait\n", __FUNCTION__);
1117
1118 /* wait for events */
1119 retval = wait_event_interruptible (dev->wait,
1120 dev->ev_next != 0);
1121 if (retval < 0)
1122 return retval;
1123 spin_lock_irq (&dev->lock);
1124 goto scan;
1125 }
1126
1127 done:
1128 spin_unlock_irq (&dev->lock);
1129 return retval;
1130 }
1131
1132 static struct usb_gadgetfs_event *
1133 next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type)
1134 {
1135 struct usb_gadgetfs_event *event;
1136 unsigned i;
1137
1138 switch (type) {
1139 /* these events purge the queue */
1140 case GADGETFS_DISCONNECT:
1141 if (dev->state == STATE_DEV_SETUP)
1142 dev->setup_abort = 1;
1143 // FALL THROUGH
1144 case GADGETFS_CONNECT:
1145 dev->ev_next = 0;
1146 break;
1147 case GADGETFS_SETUP: /* previous request timed out */
1148 case GADGETFS_SUSPEND: /* same effect */
1149 /* these events can't be repeated */
1150 for (i = 0; i != dev->ev_next; i++) {
1151 if (dev->event [i].type != type)
1152 continue;
1153 DBG(dev, "discard old event[%d] %d\n", i, type);
1154 dev->ev_next--;
1155 if (i == dev->ev_next)
1156 break;
1157 /* indices start at zero, for simplicity */
1158 memmove (&dev->event [i], &dev->event [i + 1],
1159 sizeof (struct usb_gadgetfs_event)
1160 * (dev->ev_next - i));
1161 }
1162 break;
1163 default:
1164 BUG ();
1165 }
1166 VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type);
1167 event = &dev->event [dev->ev_next++];
1168 BUG_ON (dev->ev_next > N_EVENT);
1169 memset (event, 0, sizeof *event);
1170 event->type = type;
1171 return event;
1172 }
1173
1174 static ssize_t
1175 ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
1176 {
1177 struct dev_data *dev = fd->private_data;
1178 ssize_t retval = -ESRCH;
1179
1180 spin_lock_irq (&dev->lock);
1181
1182 /* report fd mode change before acting on it */
1183 if (dev->setup_abort) {
1184 dev->setup_abort = 0;
1185 retval = -EIDRM;
1186
1187 /* data and/or status stage for control request */
1188 } else if (dev->state == STATE_DEV_SETUP) {
1189
1190 /* IN DATA+STATUS caller makes len <= wLength */
1191 if (dev->setup_in) {
1192 retval = setup_req (dev->gadget->ep0, dev->req, len);
1193 if (retval == 0) {
1194 dev->state = STATE_DEV_CONNECTED;
1195 spin_unlock_irq (&dev->lock);
1196 if (copy_from_user (dev->req->buf, buf, len))
1197 retval = -EFAULT;
1198 else {
1199 if (len < dev->setup_wLength)
1200 dev->req->zero = 1;
1201 retval = usb_ep_queue (
1202 dev->gadget->ep0, dev->req,
1203 GFP_KERNEL);
1204 }
1205 if (retval < 0) {
1206 spin_lock_irq (&dev->lock);
1207 clean_req (dev->gadget->ep0, dev->req);
1208 spin_unlock_irq (&dev->lock);
1209 } else
1210 retval = len;
1211
1212 return retval;
1213 }
1214
1215 /* can stall some OUT transfers */
1216 } else if (dev->setup_can_stall) {
1217 VDEBUG(dev, "ep0out stall\n");
1218 (void) usb_ep_set_halt (dev->gadget->ep0);
1219 retval = -EL2HLT;
1220 dev->state = STATE_DEV_CONNECTED;
1221 } else {
1222 DBG(dev, "bogus ep0out stall!\n");
1223 }
1224 } else
1225 DBG (dev, "fail %s, state %d\n", __FUNCTION__, dev->state);
1226
1227 spin_unlock_irq (&dev->lock);
1228 return retval;
1229 }
1230
1231 static int
1232 ep0_fasync (int f, struct file *fd, int on)
1233 {
1234 struct dev_data *dev = fd->private_data;
1235 // caller must F_SETOWN before signal delivery happens
1236 VDEBUG (dev, "%s %s\n", __FUNCTION__, on ? "on" : "off");
1237 return fasync_helper (f, fd, on, &dev->fasync);
1238 }
1239
1240 static struct usb_gadget_driver gadgetfs_driver;
1241
1242 static int
1243 dev_release (struct inode *inode, struct file *fd)
1244 {
1245 struct dev_data *dev = fd->private_data;
1246
1247 /* closing ep0 === shutdown all */
1248
1249 usb_gadget_unregister_driver (&gadgetfs_driver);
1250
1251 /* at this point "good" hardware has disconnected the
1252 * device from USB; the host won't see it any more.
1253 * alternatively, all host requests will time out.
1254 */
1255
1256 fasync_helper (-1, fd, 0, &dev->fasync);
1257 kfree (dev->buf);
1258 dev->buf = NULL;
1259 put_dev (dev);
1260
1261 /* other endpoints were all decoupled from this device */
1262 spin_lock_irq(&dev->lock);
1263 dev->state = STATE_DEV_DISABLED;
1264 spin_unlock_irq(&dev->lock);
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_DEV_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_DEV_UNCONNECTED) {
1396 #ifdef CONFIG_USB_GADGET_DUALSPEED
1397 if (gadget->speed == USB_SPEED_HIGH && dev->hs_config == 0) {
1398 spin_unlock(&dev->lock);
1399 ERROR (dev, "no high speed config??\n");
1400 return -EINVAL;
1401 }
1402 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1403
1404 dev->state = STATE_DEV_CONNECTED;
1405 dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket;
1406
1407 INFO (dev, "connected\n");
1408 event = next_event (dev, GADGETFS_CONNECT);
1409 event->u.speed = gadget->speed;
1410 ep0_readable (dev);
1411
1412 /* host may have given up waiting for response. we can miss control
1413 * requests handled lower down (device/endpoint status and features);
1414 * then ep0_{read,write} will report the wrong status. controller
1415 * driver will have aborted pending i/o.
1416 */
1417 } else if (dev->state == STATE_DEV_SETUP)
1418 dev->setup_abort = 1;
1419
1420 req->buf = dev->rbuf;
1421 req->dma = DMA_ADDR_INVALID;
1422 req->context = NULL;
1423 value = -EOPNOTSUPP;
1424 switch (ctrl->bRequest) {
1425
1426 case USB_REQ_GET_DESCRIPTOR:
1427 if (ctrl->bRequestType != USB_DIR_IN)
1428 goto unrecognized;
1429 switch (w_value >> 8) {
1430
1431 case USB_DT_DEVICE:
1432 value = min (w_length, (u16) sizeof *dev->dev);
1433 req->buf = dev->dev;
1434 break;
1435 #ifdef CONFIG_USB_GADGET_DUALSPEED
1436 case USB_DT_DEVICE_QUALIFIER:
1437 if (!dev->hs_config)
1438 break;
1439 value = min (w_length, (u16)
1440 sizeof (struct usb_qualifier_descriptor));
1441 make_qualifier (dev);
1442 break;
1443 case USB_DT_OTHER_SPEED_CONFIG:
1444 // FALLTHROUGH
1445 #endif
1446 case USB_DT_CONFIG:
1447 value = config_buf (dev,
1448 w_value >> 8,
1449 w_value & 0xff);
1450 if (value >= 0)
1451 value = min (w_length, (u16) value);
1452 break;
1453 case USB_DT_STRING:
1454 goto unrecognized;
1455
1456 default: // all others are errors
1457 break;
1458 }
1459 break;
1460
1461 /* currently one config, two speeds */
1462 case USB_REQ_SET_CONFIGURATION:
1463 if (ctrl->bRequestType != 0)
1464 break;
1465 if (0 == (u8) w_value) {
1466 value = 0;
1467 dev->current_config = 0;
1468 usb_gadget_vbus_draw(gadget, 8 /* mA */ );
1469 // user mode expected to disable endpoints
1470 } else {
1471 u8 config, power;
1472 #ifdef CONFIG_USB_GADGET_DUALSPEED
1473 if (gadget->speed == USB_SPEED_HIGH) {
1474 config = dev->hs_config->bConfigurationValue;
1475 power = dev->hs_config->bMaxPower;
1476 } else
1477 #endif
1478 {
1479 config = dev->config->bConfigurationValue;
1480 power = dev->config->bMaxPower;
1481 }
1482
1483 if (config == (u8) w_value) {
1484 value = 0;
1485 dev->current_config = config;
1486 usb_gadget_vbus_draw(gadget, 2 * power);
1487 }
1488 }
1489
1490 /* report SET_CONFIGURATION like any other control request,
1491 * except that usermode may not stall this. the next
1492 * request mustn't be allowed start until this finishes:
1493 * endpoints and threads set up, etc.
1494 *
1495 * NOTE: older PXA hardware (before PXA 255: without UDCCFR)
1496 * has bad/racey automagic that prevents synchronizing here.
1497 * even kernel mode drivers often miss them.
1498 */
1499 if (value == 0) {
1500 INFO (dev, "configuration #%d\n", dev->current_config);
1501 if (dev->usermode_setup) {
1502 dev->setup_can_stall = 0;
1503 goto delegate;
1504 }
1505 }
1506 break;
1507
1508 #ifndef CONFIG_USB_GADGETFS_PXA2XX
1509 /* PXA automagically handles this request too */
1510 case USB_REQ_GET_CONFIGURATION:
1511 if (ctrl->bRequestType != 0x80)
1512 break;
1513 *(u8 *)req->buf = dev->current_config;
1514 value = min (w_length, (u16) 1);
1515 break;
1516 #endif
1517
1518 default:
1519 unrecognized:
1520 VDEBUG (dev, "%s req%02x.%02x v%04x i%04x l%d\n",
1521 dev->usermode_setup ? "delegate" : "fail",
1522 ctrl->bRequestType, ctrl->bRequest,
1523 w_value, le16_to_cpu(ctrl->wIndex), w_length);
1524
1525 /* if there's an ep0 reader, don't stall */
1526 if (dev->usermode_setup) {
1527 dev->setup_can_stall = 1;
1528 delegate:
1529 dev->setup_in = (ctrl->bRequestType & USB_DIR_IN)
1530 ? 1 : 0;
1531 dev->setup_wLength = w_length;
1532 dev->setup_out_ready = 0;
1533 dev->setup_out_error = 0;
1534 value = 0;
1535
1536 /* read DATA stage for OUT right away */
1537 if (unlikely (!dev->setup_in && w_length)) {
1538 value = setup_req (gadget->ep0, dev->req,
1539 w_length);
1540 if (value < 0)
1541 break;
1542 value = usb_ep_queue (gadget->ep0, dev->req,
1543 GFP_ATOMIC);
1544 if (value < 0) {
1545 clean_req (gadget->ep0, dev->req);
1546 break;
1547 }
1548
1549 /* we can't currently stall these */
1550 dev->setup_can_stall = 0;
1551 }
1552
1553 /* state changes when reader collects event */
1554 event = next_event (dev, GADGETFS_SETUP);
1555 event->u.setup = *ctrl;
1556 ep0_readable (dev);
1557 spin_unlock (&dev->lock);
1558 return 0;
1559 }
1560 }
1561
1562 /* proceed with data transfer and status phases? */
1563 if (value >= 0 && dev->state != STATE_DEV_SETUP) {
1564 req->length = value;
1565 req->zero = value < w_length;
1566 value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC);
1567 if (value < 0) {
1568 DBG (dev, "ep_queue --> %d\n", value);
1569 req->status = 0;
1570 }
1571 }
1572
1573 /* device stalls when value < 0 */
1574 spin_unlock (&dev->lock);
1575 return value;
1576 }
1577
1578 static void destroy_ep_files (struct dev_data *dev)
1579 {
1580 struct list_head *entry, *tmp;
1581
1582 DBG (dev, "%s %d\n", __FUNCTION__, dev->state);
1583
1584 /* dev->state must prevent interference */
1585 restart:
1586 spin_lock_irq (&dev->lock);
1587 list_for_each_safe (entry, tmp, &dev->epfiles) {
1588 struct ep_data *ep;
1589 struct inode *parent;
1590 struct dentry *dentry;
1591
1592 /* break link to FS */
1593 ep = list_entry (entry, struct ep_data, epfiles);
1594 list_del_init (&ep->epfiles);
1595 dentry = ep->dentry;
1596 ep->dentry = NULL;
1597 parent = dentry->d_parent->d_inode;
1598
1599 /* break link to controller */
1600 if (ep->state == STATE_EP_ENABLED)
1601 (void) usb_ep_disable (ep->ep);
1602 ep->state = STATE_EP_UNBOUND;
1603 usb_ep_free_request (ep->ep, ep->req);
1604 ep->ep = NULL;
1605 wake_up (&ep->wait);
1606 put_ep (ep);
1607
1608 spin_unlock_irq (&dev->lock);
1609
1610 /* break link to dcache */
1611 mutex_lock (&parent->i_mutex);
1612 d_delete (dentry);
1613 dput (dentry);
1614 mutex_unlock (&parent->i_mutex);
1615
1616 /* fds may still be open */
1617 goto restart;
1618 }
1619 spin_unlock_irq (&dev->lock);
1620 }
1621
1622
1623 static struct inode *
1624 gadgetfs_create_file (struct super_block *sb, char const *name,
1625 void *data, const struct file_operations *fops,
1626 struct dentry **dentry_p);
1627
1628 static int activate_ep_files (struct dev_data *dev)
1629 {
1630 struct usb_ep *ep;
1631 struct ep_data *data;
1632
1633 gadget_for_each_ep (ep, dev->gadget) {
1634
1635 data = kzalloc(sizeof(*data), GFP_KERNEL);
1636 if (!data)
1637 goto enomem0;
1638 data->state = STATE_EP_DISABLED;
1639 init_MUTEX (&data->lock);
1640 init_waitqueue_head (&data->wait);
1641
1642 strncpy (data->name, ep->name, sizeof (data->name) - 1);
1643 atomic_set (&data->count, 1);
1644 data->dev = dev;
1645 get_dev (dev);
1646
1647 data->ep = ep;
1648 ep->driver_data = data;
1649
1650 data->req = usb_ep_alloc_request (ep, GFP_KERNEL);
1651 if (!data->req)
1652 goto enomem1;
1653
1654 data->inode = gadgetfs_create_file (dev->sb, data->name,
1655 data, &ep_config_operations,
1656 &data->dentry);
1657 if (!data->inode)
1658 goto enomem2;
1659 list_add_tail (&data->epfiles, &dev->epfiles);
1660 }
1661 return 0;
1662
1663 enomem2:
1664 usb_ep_free_request (ep, data->req);
1665 enomem1:
1666 put_dev (dev);
1667 kfree (data);
1668 enomem0:
1669 DBG (dev, "%s enomem\n", __FUNCTION__);
1670 destroy_ep_files (dev);
1671 return -ENOMEM;
1672 }
1673
1674 static void
1675 gadgetfs_unbind (struct usb_gadget *gadget)
1676 {
1677 struct dev_data *dev = get_gadget_data (gadget);
1678
1679 DBG (dev, "%s\n", __FUNCTION__);
1680
1681 spin_lock_irq (&dev->lock);
1682 dev->state = STATE_DEV_UNBOUND;
1683 spin_unlock_irq (&dev->lock);
1684
1685 destroy_ep_files (dev);
1686 gadget->ep0->driver_data = NULL;
1687 set_gadget_data (gadget, NULL);
1688
1689 /* we've already been disconnected ... no i/o is active */
1690 if (dev->req)
1691 usb_ep_free_request (gadget->ep0, dev->req);
1692 DBG (dev, "%s done\n", __FUNCTION__);
1693 put_dev (dev);
1694 }
1695
1696 static struct dev_data *the_device;
1697
1698 static int
1699 gadgetfs_bind (struct usb_gadget *gadget)
1700 {
1701 struct dev_data *dev = the_device;
1702
1703 if (!dev)
1704 return -ESRCH;
1705 if (0 != strcmp (CHIP, gadget->name)) {
1706 printk (KERN_ERR "%s expected %s controller not %s\n",
1707 shortname, CHIP, gadget->name);
1708 return -ENODEV;
1709 }
1710
1711 set_gadget_data (gadget, dev);
1712 dev->gadget = gadget;
1713 gadget->ep0->driver_data = dev;
1714 dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket;
1715
1716 /* preallocate control response and buffer */
1717 dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL);
1718 if (!dev->req)
1719 goto enomem;
1720 dev->req->context = NULL;
1721 dev->req->complete = epio_complete;
1722
1723 if (activate_ep_files (dev) < 0)
1724 goto enomem;
1725
1726 INFO (dev, "bound to %s driver\n", gadget->name);
1727 spin_lock_irq(&dev->lock);
1728 dev->state = STATE_DEV_UNCONNECTED;
1729 spin_unlock_irq(&dev->lock);
1730 get_dev (dev);
1731 return 0;
1732
1733 enomem:
1734 gadgetfs_unbind (gadget);
1735 return -ENOMEM;
1736 }
1737
1738 static void
1739 gadgetfs_disconnect (struct usb_gadget *gadget)
1740 {
1741 struct dev_data *dev = get_gadget_data (gadget);
1742
1743 spin_lock (&dev->lock);
1744 if (dev->state == STATE_DEV_UNCONNECTED)
1745 goto exit;
1746 dev->state = STATE_DEV_UNCONNECTED;
1747
1748 INFO (dev, "disconnected\n");
1749 next_event (dev, GADGETFS_DISCONNECT);
1750 ep0_readable (dev);
1751 exit:
1752 spin_unlock (&dev->lock);
1753 }
1754
1755 static void
1756 gadgetfs_suspend (struct usb_gadget *gadget)
1757 {
1758 struct dev_data *dev = get_gadget_data (gadget);
1759
1760 INFO (dev, "suspended from state %d\n", dev->state);
1761 spin_lock (&dev->lock);
1762 switch (dev->state) {
1763 case STATE_DEV_SETUP: // VERY odd... host died??
1764 case STATE_DEV_CONNECTED:
1765 case STATE_DEV_UNCONNECTED:
1766 next_event (dev, GADGETFS_SUSPEND);
1767 ep0_readable (dev);
1768 /* FALLTHROUGH */
1769 default:
1770 break;
1771 }
1772 spin_unlock (&dev->lock);
1773 }
1774
1775 static struct usb_gadget_driver gadgetfs_driver = {
1776 #ifdef CONFIG_USB_GADGET_DUALSPEED
1777 .speed = USB_SPEED_HIGH,
1778 #else
1779 .speed = USB_SPEED_FULL,
1780 #endif
1781 .function = (char *) driver_desc,
1782 .bind = gadgetfs_bind,
1783 .unbind = gadgetfs_unbind,
1784 .setup = gadgetfs_setup,
1785 .disconnect = gadgetfs_disconnect,
1786 .suspend = gadgetfs_suspend,
1787
1788 .driver = {
1789 .name = (char *) shortname,
1790 },
1791 };
1792
1793 /*----------------------------------------------------------------------*/
1794
1795 static void gadgetfs_nop(struct usb_gadget *arg) { }
1796
1797 static int gadgetfs_probe (struct usb_gadget *gadget)
1798 {
1799 CHIP = gadget->name;
1800 return -EISNAM;
1801 }
1802
1803 static struct usb_gadget_driver probe_driver = {
1804 .speed = USB_SPEED_HIGH,
1805 .bind = gadgetfs_probe,
1806 .unbind = gadgetfs_nop,
1807 .setup = (void *)gadgetfs_nop,
1808 .disconnect = gadgetfs_nop,
1809 .driver = {
1810 .name = "nop",
1811 },
1812 };
1813
1814
1815 /* DEVICE INITIALIZATION
1816 *
1817 * fd = open ("/dev/gadget/$CHIP", O_RDWR)
1818 * status = write (fd, descriptors, sizeof descriptors)
1819 *
1820 * That write establishes the device configuration, so the kernel can
1821 * bind to the controller ... guaranteeing it can handle enumeration
1822 * at all necessary speeds. Descriptor order is:
1823 *
1824 * . message tag (u32, host order) ... for now, must be zero; it
1825 * would change to support features like multi-config devices
1826 * . full/low speed config ... all wTotalLength bytes (with interface,
1827 * class, altsetting, endpoint, and other descriptors)
1828 * . high speed config ... all descriptors, for high speed operation;
1829 * this one's optional except for high-speed hardware
1830 * . device descriptor
1831 *
1832 * Endpoints are not yet enabled. Drivers must wait until device
1833 * configuration and interface altsetting changes create
1834 * the need to configure (or unconfigure) them.
1835 *
1836 * After initialization, the device stays active for as long as that
1837 * $CHIP file is open. Events must then be read from that descriptor,
1838 * such as configuration notifications.
1839 */
1840
1841 static int is_valid_config (struct usb_config_descriptor *config)
1842 {
1843 return config->bDescriptorType == USB_DT_CONFIG
1844 && config->bLength == USB_DT_CONFIG_SIZE
1845 && config->bConfigurationValue != 0
1846 && (config->bmAttributes & USB_CONFIG_ATT_ONE) != 0
1847 && (config->bmAttributes & USB_CONFIG_ATT_WAKEUP) == 0;
1848 /* FIXME if gadget->is_otg, _must_ include an otg descriptor */
1849 /* FIXME check lengths: walk to end */
1850 }
1851
1852 static ssize_t
1853 dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
1854 {
1855 struct dev_data *dev = fd->private_data;
1856 ssize_t value = len, length = len;
1857 unsigned total;
1858 u32 tag;
1859 char *kbuf;
1860
1861 if (len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4))
1862 return -EINVAL;
1863
1864 /* we might need to change message format someday */
1865 if (copy_from_user (&tag, buf, 4))
1866 return -EFAULT;
1867 if (tag != 0)
1868 return -EINVAL;
1869 buf += 4;
1870 length -= 4;
1871
1872 kbuf = kmalloc (length, GFP_KERNEL);
1873 if (!kbuf)
1874 return -ENOMEM;
1875 if (copy_from_user (kbuf, buf, length)) {
1876 kfree (kbuf);
1877 return -EFAULT;
1878 }
1879
1880 spin_lock_irq (&dev->lock);
1881 value = -EINVAL;
1882 if (dev->buf)
1883 goto fail;
1884 dev->buf = kbuf;
1885
1886 /* full or low speed config */
1887 dev->config = (void *) kbuf;
1888 total = le16_to_cpup (&dev->config->wTotalLength);
1889 if (!is_valid_config (dev->config) || total >= length)
1890 goto fail;
1891 kbuf += total;
1892 length -= total;
1893
1894 /* optional high speed config */
1895 if (kbuf [1] == USB_DT_CONFIG) {
1896 dev->hs_config = (void *) kbuf;
1897 total = le16_to_cpup (&dev->hs_config->wTotalLength);
1898 if (!is_valid_config (dev->hs_config) || total >= length)
1899 goto fail;
1900 kbuf += total;
1901 length -= total;
1902 }
1903
1904 /* could support multiple configs, using another encoding! */
1905
1906 /* device descriptor (tweaked for paranoia) */
1907 if (length != USB_DT_DEVICE_SIZE)
1908 goto fail;
1909 dev->dev = (void *)kbuf;
1910 if (dev->dev->bLength != USB_DT_DEVICE_SIZE
1911 || dev->dev->bDescriptorType != USB_DT_DEVICE
1912 || dev->dev->bNumConfigurations != 1)
1913 goto fail;
1914 dev->dev->bNumConfigurations = 1;
1915 dev->dev->bcdUSB = __constant_cpu_to_le16 (0x0200);
1916
1917 /* triggers gadgetfs_bind(); then we can enumerate. */
1918 spin_unlock_irq (&dev->lock);
1919 value = usb_gadget_register_driver (&gadgetfs_driver);
1920 if (value != 0) {
1921 kfree (dev->buf);
1922 dev->buf = NULL;
1923 } else {
1924 /* at this point "good" hardware has for the first time
1925 * let the USB the host see us. alternatively, if users
1926 * unplug/replug that will clear all the error state.
1927 *
1928 * note: everything running before here was guaranteed
1929 * to choke driver model style diagnostics. from here
1930 * on, they can work ... except in cleanup paths that
1931 * kick in after the ep0 descriptor is closed.
1932 */
1933 fd->f_op = &ep0_io_operations;
1934 value = len;
1935 }
1936 return value;
1937
1938 fail:
1939 spin_unlock_irq (&dev->lock);
1940 pr_debug ("%s: %s fail %Zd, %p\n", shortname, __FUNCTION__, value, dev);
1941 kfree (dev->buf);
1942 dev->buf = NULL;
1943 return value;
1944 }
1945
1946 static int
1947 dev_open (struct inode *inode, struct file *fd)
1948 {
1949 struct dev_data *dev = inode->i_private;
1950 int value = -EBUSY;
1951
1952 spin_lock_irq(&dev->lock);
1953 if (dev->state == STATE_DEV_DISABLED) {
1954 dev->ev_next = 0;
1955 dev->state = STATE_DEV_OPENED;
1956 fd->private_data = dev;
1957 get_dev (dev);
1958 value = 0;
1959 }
1960 spin_unlock_irq(&dev->lock);
1961 return value;
1962 }
1963
1964 static const struct file_operations dev_init_operations = {
1965 .owner = THIS_MODULE,
1966 .llseek = no_llseek,
1967
1968 .open = dev_open,
1969 .write = dev_config,
1970 .fasync = ep0_fasync,
1971 .ioctl = dev_ioctl,
1972 .release = dev_release,
1973 };
1974
1975 /*----------------------------------------------------------------------*/
1976
1977 /* FILESYSTEM AND SUPERBLOCK OPERATIONS
1978 *
1979 * Mounting the filesystem creates a controller file, used first for
1980 * device configuration then later for event monitoring.
1981 */
1982
1983
1984 /* FIXME PAM etc could set this security policy without mount options
1985 * if epfiles inherited ownership and permissons from ep0 ...
1986 */
1987
1988 static unsigned default_uid;
1989 static unsigned default_gid;
1990 static unsigned default_perm = S_IRUSR | S_IWUSR;
1991
1992 module_param (default_uid, uint, 0644);
1993 module_param (default_gid, uint, 0644);
1994 module_param (default_perm, uint, 0644);
1995
1996
1997 static struct inode *
1998 gadgetfs_make_inode (struct super_block *sb,
1999 void *data, const struct file_operations *fops,
2000 int mode)
2001 {
2002 struct inode *inode = new_inode (sb);
2003
2004 if (inode) {
2005 inode->i_mode = mode;
2006 inode->i_uid = default_uid;
2007 inode->i_gid = default_gid;
2008 inode->i_blocks = 0;
2009 inode->i_atime = inode->i_mtime = inode->i_ctime
2010 = CURRENT_TIME;
2011 inode->i_private = data;
2012 inode->i_fop = fops;
2013 }
2014 return inode;
2015 }
2016
2017 /* creates in fs root directory, so non-renamable and non-linkable.
2018 * so inode and dentry are paired, until device reconfig.
2019 */
2020 static struct inode *
2021 gadgetfs_create_file (struct super_block *sb, char const *name,
2022 void *data, const struct file_operations *fops,
2023 struct dentry **dentry_p)
2024 {
2025 struct dentry *dentry;
2026 struct inode *inode;
2027
2028 dentry = d_alloc_name(sb->s_root, name);
2029 if (!dentry)
2030 return NULL;
2031
2032 inode = gadgetfs_make_inode (sb, data, fops,
2033 S_IFREG | (default_perm & S_IRWXUGO));
2034 if (!inode) {
2035 dput(dentry);
2036 return NULL;
2037 }
2038 d_add (dentry, inode);
2039 *dentry_p = dentry;
2040 return inode;
2041 }
2042
2043 static struct super_operations gadget_fs_operations = {
2044 .statfs = simple_statfs,
2045 .drop_inode = generic_delete_inode,
2046 };
2047
2048 static int
2049 gadgetfs_fill_super (struct super_block *sb, void *opts, int silent)
2050 {
2051 struct inode *inode;
2052 struct dentry *d;
2053 struct dev_data *dev;
2054
2055 if (the_device)
2056 return -ESRCH;
2057
2058 /* fake probe to determine $CHIP */
2059 (void) usb_gadget_register_driver (&probe_driver);
2060 if (!CHIP)
2061 return -ENODEV;
2062
2063 /* superblock */
2064 sb->s_blocksize = PAGE_CACHE_SIZE;
2065 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2066 sb->s_magic = GADGETFS_MAGIC;
2067 sb->s_op = &gadget_fs_operations;
2068 sb->s_time_gran = 1;
2069
2070 /* root inode */
2071 inode = gadgetfs_make_inode (sb,
2072 NULL, &simple_dir_operations,
2073 S_IFDIR | S_IRUGO | S_IXUGO);
2074 if (!inode)
2075 goto enomem0;
2076 inode->i_op = &simple_dir_inode_operations;
2077 if (!(d = d_alloc_root (inode)))
2078 goto enomem1;
2079 sb->s_root = d;
2080
2081 /* the ep0 file is named after the controller we expect;
2082 * user mode code can use it for sanity checks, like we do.
2083 */
2084 dev = dev_new ();
2085 if (!dev)
2086 goto enomem2;
2087
2088 dev->sb = sb;
2089 if (!gadgetfs_create_file (sb, CHIP,
2090 dev, &dev_init_operations,
2091 &dev->dentry))
2092 goto enomem3;
2093
2094 /* other endpoint files are available after hardware setup,
2095 * from binding to a controller.
2096 */
2097 the_device = dev;
2098 return 0;
2099
2100 enomem3:
2101 put_dev (dev);
2102 enomem2:
2103 dput (d);
2104 enomem1:
2105 iput (inode);
2106 enomem0:
2107 return -ENOMEM;
2108 }
2109
2110 /* "mount -t gadgetfs path /dev/gadget" ends up here */
2111 static int
2112 gadgetfs_get_sb (struct file_system_type *t, int flags,
2113 const char *path, void *opts, struct vfsmount *mnt)
2114 {
2115 return get_sb_single (t, flags, opts, gadgetfs_fill_super, mnt);
2116 }
2117
2118 static void
2119 gadgetfs_kill_sb (struct super_block *sb)
2120 {
2121 kill_litter_super (sb);
2122 if (the_device) {
2123 put_dev (the_device);
2124 the_device = NULL;
2125 }
2126 }
2127
2128 /*----------------------------------------------------------------------*/
2129
2130 static struct file_system_type gadgetfs_type = {
2131 .owner = THIS_MODULE,
2132 .name = shortname,
2133 .get_sb = gadgetfs_get_sb,
2134 .kill_sb = gadgetfs_kill_sb,
2135 };
2136
2137 /*----------------------------------------------------------------------*/
2138
2139 static int __init init (void)
2140 {
2141 int status;
2142
2143 status = register_filesystem (&gadgetfs_type);
2144 if (status == 0)
2145 pr_info ("%s: %s, version " DRIVER_VERSION "\n",
2146 shortname, driver_desc);
2147 return status;
2148 }
2149 module_init (init);
2150
2151 static void __exit cleanup (void)
2152 {
2153 pr_debug ("unregister %s\n", shortname);
2154 unregister_filesystem (&gadgetfs_type);
2155 }
2156 module_exit (cleanup);
2157
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