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USB: gadgetfs race fix
[wandboard.git] / drivers / usb / gadget / inode.c
blobe5ce4f0bb7cca6b5bf2d94fbc36368a05729cefe
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 int i;
557
558 /* we "retry" to get the right mm context for this: */
559
560 /* copy stuff into user buffers */
561 total = priv->actual;
562 len = 0;
563 for (i=0; i < priv->nr_segs; i++) {
564 ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total);
565
566 if (copy_to_user(priv->iv[i].iov_base, priv->buf, this)) {
567 if (len == 0)
568 len = -EFAULT;
569 break;
570 }
571
572 total -= this;
573 len += this;
574 if (total == 0)
575 break;
576 }
577 kfree(priv->buf);
578 kfree(priv);
579 aio_put_req(iocb);
580 return len;
581 }
582
583 static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req)
584 {
585 struct kiocb *iocb = req->context;
586 struct kiocb_priv *priv = iocb->private;
587 struct ep_data *epdata = priv->epdata;
588
589 /* lock against disconnect (and ideally, cancel) */
590 spin_lock(&epdata->dev->lock);
591 priv->req = NULL;
592 priv->epdata = NULL;
593 if (priv->iv == NULL
594 || unlikely(req->actual == 0)
595 || unlikely(kiocbIsCancelled(iocb))) {
596 kfree(req->buf);
597 kfree(priv);
598 iocb->private = NULL;
599 /* aio_complete() reports bytes-transferred _and_ faults */
600 if (unlikely(kiocbIsCancelled(iocb)))
601 aio_put_req(iocb);
602 else
603 aio_complete(iocb,
604 req->actual ? req->actual : req->status,
605 req->status);
606 } else {
607 /* retry() won't report both; so we hide some faults */
608 if (unlikely(0 != req->status))
609 DBG(epdata->dev, "%s fault %d len %d\n",
610 ep->name, req->status, req->actual);
611
612 priv->buf = req->buf;
613 priv->actual = req->actual;
614 kick_iocb(iocb);
615 }
616 spin_unlock(&epdata->dev->lock);
617
618 usb_ep_free_request(ep, req);
619 put_ep(epdata);
620 }
621
622 static ssize_t
623 ep_aio_rwtail(
624 struct kiocb *iocb,
625 char *buf,
626 size_t len,
627 struct ep_data *epdata,
628 const struct iovec *iv,
629 unsigned long nr_segs
630 )
631 {
632 struct kiocb_priv *priv;
633 struct usb_request *req;
634 ssize_t value;
635
636 priv = kmalloc(sizeof *priv, GFP_KERNEL);
637 if (!priv) {
638 value = -ENOMEM;
639 fail:
640 kfree(buf);
641 return value;
642 }
643 iocb->private = priv;
644 priv->iv = iv;
645 priv->nr_segs = nr_segs;
646
647 value = get_ready_ep(iocb->ki_filp->f_flags, epdata);
648 if (unlikely(value < 0)) {
649 kfree(priv);
650 goto fail;
651 }
652
653 iocb->ki_cancel = ep_aio_cancel;
654 get_ep(epdata);
655 priv->epdata = epdata;
656 priv->actual = 0;
657
658 /* each kiocb is coupled to one usb_request, but we can't
659 * allocate or submit those if the host disconnected.
660 */
661 spin_lock_irq(&epdata->dev->lock);
662 if (likely(epdata->ep)) {
663 req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC);
664 if (likely(req)) {
665 priv->req = req;
666 req->buf = buf;
667 req->length = len;
668 req->complete = ep_aio_complete;
669 req->context = iocb;
670 value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC);
671 if (unlikely(0 != value))
672 usb_ep_free_request(epdata->ep, req);
673 } else
674 value = -EAGAIN;
675 } else
676 value = -ENODEV;
677 spin_unlock_irq(&epdata->dev->lock);
678
679 up(&epdata->lock);
680
681 if (unlikely(value)) {
682 kfree(priv);
683 put_ep(epdata);
684 } else
685 value = (iv ? -EIOCBRETRY : -EIOCBQUEUED);
686 return value;
687 }
688
689 static ssize_t
690 ep_aio_read(struct kiocb *iocb, const struct iovec *iov,
691 unsigned long nr_segs, loff_t o)
692 {
693 struct ep_data *epdata = iocb->ki_filp->private_data;
694 char *buf;
695
696 if (unlikely(epdata->desc.bEndpointAddress & USB_DIR_IN))
697 return -EINVAL;
698
699 buf = kmalloc(iocb->ki_left, GFP_KERNEL);
700 if (unlikely(!buf))
701 return -ENOMEM;
702
703 iocb->ki_retry = ep_aio_read_retry;
704 return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs);
705 }
706
707 static ssize_t
708 ep_aio_write(struct kiocb *iocb, const struct iovec *iov,
709 unsigned long nr_segs, loff_t o)
710 {
711 struct ep_data *epdata = iocb->ki_filp->private_data;
712 char *buf;
713 size_t len = 0;
714 int i = 0;
715
716 if (unlikely(!(epdata->desc.bEndpointAddress & USB_DIR_IN)))
717 return -EINVAL;
718
719 buf = kmalloc(iocb->ki_left, GFP_KERNEL);
720 if (unlikely(!buf))
721 return -ENOMEM;
722
723 for (i=0; i < nr_segs; i++) {
724 if (unlikely(copy_from_user(&buf[len], iov[i].iov_base,
725 iov[i].iov_len) != 0)) {
726 kfree(buf);
727 return -EFAULT;
728 }
729 len += iov[i].iov_len;
730 }
731 return ep_aio_rwtail(iocb, buf, len, epdata, NULL, 0);
732 }
733
734 /*----------------------------------------------------------------------*/
735
736 /* used after endpoint configuration */
737 static const struct file_operations ep_io_operations = {
738 .owner = THIS_MODULE,
739 .llseek = no_llseek,
740
741 .read = ep_read,
742 .write = ep_write,
743 .ioctl = ep_ioctl,
744 .release = ep_release,
745
746 .aio_read = ep_aio_read,
747 .aio_write = ep_aio_write,
748 };
749
750 /* ENDPOINT INITIALIZATION
751 *
752 * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR)
753 * status = write (fd, descriptors, sizeof descriptors)
754 *
755 * That write establishes the endpoint configuration, configuring
756 * the controller to process bulk, interrupt, or isochronous transfers
757 * at the right maxpacket size, and so on.
758 *
759 * The descriptors are message type 1, identified by a host order u32
760 * at the beginning of what's written. Descriptor order is: full/low
761 * speed descriptor, then optional high speed descriptor.
762 */
763 static ssize_t
764 ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
765 {
766 struct ep_data *data = fd->private_data;
767 struct usb_ep *ep;
768 u32 tag;
769 int value, length = len;
770
771 if ((value = down_interruptible (&data->lock)) < 0)
772 return value;
773
774 if (data->state != STATE_EP_READY) {
775 value = -EL2HLT;
776 goto fail;
777 }
778
779 value = len;
780 if (len < USB_DT_ENDPOINT_SIZE + 4)
781 goto fail0;
782
783 /* we might need to change message format someday */
784 if (copy_from_user (&tag, buf, 4)) {
785 goto fail1;
786 }
787 if (tag != 1) {
788 DBG(data->dev, "config %s, bad tag %d\n", data->name, tag);
789 goto fail0;
790 }
791 buf += 4;
792 len -= 4;
793
794 /* NOTE: audio endpoint extensions not accepted here;
795 * just don't include the extra bytes.
796 */
797
798 /* full/low speed descriptor, then high speed */
799 if (copy_from_user (&data->desc, buf, USB_DT_ENDPOINT_SIZE)) {
800 goto fail1;
801 }
802 if (data->desc.bLength != USB_DT_ENDPOINT_SIZE
803 || data->desc.bDescriptorType != USB_DT_ENDPOINT)
804 goto fail0;
805 if (len != USB_DT_ENDPOINT_SIZE) {
806 if (len != 2 * USB_DT_ENDPOINT_SIZE)
807 goto fail0;
808 if (copy_from_user (&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE,
809 USB_DT_ENDPOINT_SIZE)) {
810 goto fail1;
811 }
812 if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE
813 || data->hs_desc.bDescriptorType
814 != USB_DT_ENDPOINT) {
815 DBG(data->dev, "config %s, bad hs length or type\n",
816 data->name);
817 goto fail0;
818 }
819 }
820
821 spin_lock_irq (&data->dev->lock);
822 if (data->dev->state == STATE_DEV_UNBOUND) {
823 value = -ENOENT;
824 goto gone;
825 } else if ((ep = data->ep) == NULL) {
826 value = -ENODEV;
827 goto gone;
828 }
829 switch (data->dev->gadget->speed) {
830 case USB_SPEED_LOW:
831 case USB_SPEED_FULL:
832 value = usb_ep_enable (ep, &data->desc);
833 if (value == 0)
834 data->state = STATE_EP_ENABLED;
835 break;
836 #ifdef CONFIG_USB_GADGET_DUALSPEED
837 case USB_SPEED_HIGH:
838 /* fails if caller didn't provide that descriptor... */
839 value = usb_ep_enable (ep, &data->hs_desc);
840 if (value == 0)
841 data->state = STATE_EP_ENABLED;
842 break;
843 #endif
844 default:
845 DBG(data->dev, "unconnected, %s init abandoned\n",
846 data->name);
847 value = -EINVAL;
848 }
849 if (value == 0) {
850 fd->f_op = &ep_io_operations;
851 value = length;
852 }
853 gone:
854 spin_unlock_irq (&data->dev->lock);
855 if (value < 0) {
856 fail:
857 data->desc.bDescriptorType = 0;
858 data->hs_desc.bDescriptorType = 0;
859 }
860 up (&data->lock);
861 return value;
862 fail0:
863 value = -EINVAL;
864 goto fail;
865 fail1:
866 value = -EFAULT;
867 goto fail;
868 }
869
870 static int
871 ep_open (struct inode *inode, struct file *fd)
872 {
873 struct ep_data *data = inode->i_private;
874 int value = -EBUSY;
875
876 if (down_interruptible (&data->lock) != 0)
877 return -EINTR;
878 spin_lock_irq (&data->dev->lock);
879 if (data->dev->state == STATE_DEV_UNBOUND)
880 value = -ENOENT;
881 else if (data->state == STATE_EP_DISABLED) {
882 value = 0;
883 data->state = STATE_EP_READY;
884 get_ep (data);
885 fd->private_data = data;
886 VDEBUG (data->dev, "%s ready\n", data->name);
887 } else
888 DBG (data->dev, "%s state %d\n",
889 data->name, data->state);
890 spin_unlock_irq (&data->dev->lock);
891 up (&data->lock);
892 return value;
893 }
894
895 /* used before endpoint configuration */
896 static const struct file_operations ep_config_operations = {
897 .owner = THIS_MODULE,
898 .llseek = no_llseek,
899
900 .open = ep_open,
901 .write = ep_config,
902 .release = ep_release,
903 };
904
905 /*----------------------------------------------------------------------*/
906
907 /* EP0 IMPLEMENTATION can be partly in userspace.
908 *
909 * Drivers that use this facility receive various events, including
910 * control requests the kernel doesn't handle. Drivers that don't
911 * use this facility may be too simple-minded for real applications.
912 */
913
914 static inline void ep0_readable (struct dev_data *dev)
915 {
916 wake_up (&dev->wait);
917 kill_fasync (&dev->fasync, SIGIO, POLL_IN);
918 }
919
920 static void clean_req (struct usb_ep *ep, struct usb_request *req)
921 {
922 struct dev_data *dev = ep->driver_data;
923
924 if (req->buf != dev->rbuf) {
925 usb_ep_free_buffer (ep, req->buf, req->dma, req->length);
926 req->buf = dev->rbuf;
927 req->dma = DMA_ADDR_INVALID;
928 }
929 req->complete = epio_complete;
930 dev->setup_out_ready = 0;
931 }
932
933 static void ep0_complete (struct usb_ep *ep, struct usb_request *req)
934 {
935 struct dev_data *dev = ep->driver_data;
936 unsigned long flags;
937 int free = 1;
938
939 /* for control OUT, data must still get to userspace */
940 spin_lock_irqsave(&dev->lock, flags);
941 if (!dev->setup_in) {
942 dev->setup_out_error = (req->status != 0);
943 if (!dev->setup_out_error)
944 free = 0;
945 dev->setup_out_ready = 1;
946 ep0_readable (dev);
947 }
948
949 /* clean up as appropriate */
950 if (free && req->buf != &dev->rbuf)
951 clean_req (ep, req);
952 req->complete = epio_complete;
953 spin_unlock_irqrestore(&dev->lock, flags);
954 }
955
956 static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len)
957 {
958 struct dev_data *dev = ep->driver_data;
959
960 if (dev->setup_out_ready) {
961 DBG (dev, "ep0 request busy!\n");
962 return -EBUSY;
963 }
964 if (len > sizeof (dev->rbuf))
965 req->buf = usb_ep_alloc_buffer (ep, len, &req->dma, GFP_ATOMIC);
966 if (req->buf == 0) {
967 req->buf = dev->rbuf;
968 return -ENOMEM;
969 }
970 req->complete = ep0_complete;
971 req->length = len;
972 req->zero = 0;
973 return 0;
974 }
975
976 static ssize_t
977 ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
978 {
979 struct dev_data *dev = fd->private_data;
980 ssize_t retval;
981 enum ep0_state state;
982
983 spin_lock_irq (&dev->lock);
984
985 /* report fd mode change before acting on it */
986 if (dev->setup_abort) {
987 dev->setup_abort = 0;
988 retval = -EIDRM;
989 goto done;
990 }
991
992 /* control DATA stage */
993 if ((state = dev->state) == STATE_DEV_SETUP) {
994
995 if (dev->setup_in) { /* stall IN */
996 VDEBUG(dev, "ep0in stall\n");
997 (void) usb_ep_set_halt (dev->gadget->ep0);
998 retval = -EL2HLT;
999 dev->state = STATE_DEV_CONNECTED;
1000
1001 } else if (len == 0) { /* ack SET_CONFIGURATION etc */
1002 struct usb_ep *ep = dev->gadget->ep0;
1003 struct usb_request *req = dev->req;
1004
1005 if ((retval = setup_req (ep, req, 0)) == 0)
1006 retval = usb_ep_queue (ep, req, GFP_ATOMIC);
1007 dev->state = STATE_DEV_CONNECTED;
1008
1009 /* assume that was SET_CONFIGURATION */
1010 if (dev->current_config) {
1011 unsigned power;
1012 #ifdef CONFIG_USB_GADGET_DUALSPEED
1013 if (dev->gadget->speed == USB_SPEED_HIGH)
1014 power = dev->hs_config->bMaxPower;
1015 else
1016 #endif
1017 power = dev->config->bMaxPower;
1018 usb_gadget_vbus_draw(dev->gadget, 2 * power);
1019 }
1020
1021 } else { /* collect OUT data */
1022 if ((fd->f_flags & O_NONBLOCK) != 0
1023 && !dev->setup_out_ready) {
1024 retval = -EAGAIN;
1025 goto done;
1026 }
1027 spin_unlock_irq (&dev->lock);
1028 retval = wait_event_interruptible (dev->wait,
1029 dev->setup_out_ready != 0);
1030
1031 /* FIXME state could change from under us */
1032 spin_lock_irq (&dev->lock);
1033 if (retval)
1034 goto done;
1035
1036 if (dev->state != STATE_DEV_SETUP) {
1037 retval = -ECANCELED;
1038 goto done;
1039 }
1040 dev->state = STATE_DEV_CONNECTED;
1041
1042 if (dev->setup_out_error)
1043 retval = -EIO;
1044 else {
1045 len = min (len, (size_t)dev->req->actual);
1046 // FIXME don't call this with the spinlock held ...
1047 if (copy_to_user (buf, dev->req->buf, len))
1048 retval = -EFAULT;
1049 clean_req (dev->gadget->ep0, dev->req);
1050 /* NOTE userspace can't yet choose to stall */
1051 }
1052 }
1053 goto done;
1054 }
1055
1056 /* else normal: return event data */
1057 if (len < sizeof dev->event [0]) {
1058 retval = -EINVAL;
1059 goto done;
1060 }
1061 len -= len % sizeof (struct usb_gadgetfs_event);
1062 dev->usermode_setup = 1;
1063
1064 scan:
1065 /* return queued events right away */
1066 if (dev->ev_next != 0) {
1067 unsigned i, n;
1068
1069 n = len / sizeof (struct usb_gadgetfs_event);
1070 if (dev->ev_next < n)
1071 n = dev->ev_next;
1072
1073 /* ep0 i/o has special semantics during STATE_DEV_SETUP */
1074 for (i = 0; i < n; i++) {
1075 if (dev->event [i].type == GADGETFS_SETUP) {
1076 dev->state = STATE_DEV_SETUP;
1077 n = i + 1;
1078 break;
1079 }
1080 }
1081 spin_unlock_irq (&dev->lock);
1082 len = n * sizeof (struct usb_gadgetfs_event);
1083 if (copy_to_user (buf, &dev->event, len))
1084 retval = -EFAULT;
1085 else
1086 retval = len;
1087 if (len > 0) {
1088 /* NOTE this doesn't guard against broken drivers;
1089 * concurrent ep0 readers may lose events.
1090 */
1091 spin_lock_irq (&dev->lock);
1092 if (dev->ev_next > n) {
1093 memmove(&dev->event[0], &dev->event[n],
1094 sizeof (struct usb_gadgetfs_event)
1095 * (dev->ev_next - n));
1096 }
1097 dev->ev_next -= n;
1098 spin_unlock_irq (&dev->lock);
1099 }
1100 return retval;
1101 }
1102 if (fd->f_flags & O_NONBLOCK) {
1103 retval = -EAGAIN;
1104 goto done;
1105 }
1106
1107 switch (state) {
1108 default:
1109 DBG (dev, "fail %s, state %d\n", __FUNCTION__, state);
1110 retval = -ESRCH;
1111 break;
1112 case STATE_DEV_UNCONNECTED:
1113 case STATE_DEV_CONNECTED:
1114 spin_unlock_irq (&dev->lock);
1115 DBG (dev, "%s wait\n", __FUNCTION__);
1116
1117 /* wait for events */
1118 retval = wait_event_interruptible (dev->wait,
1119 dev->ev_next != 0);
1120 if (retval < 0)
1121 return retval;
1122 spin_lock_irq (&dev->lock);
1123 goto scan;
1124 }
1125
1126 done:
1127 spin_unlock_irq (&dev->lock);
1128 return retval;
1129 }
1130
1131 static struct usb_gadgetfs_event *
1132 next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type)
1133 {
1134 struct usb_gadgetfs_event *event;
1135 unsigned i;
1136
1137 switch (type) {
1138 /* these events purge the queue */
1139 case GADGETFS_DISCONNECT:
1140 if (dev->state == STATE_DEV_SETUP)
1141 dev->setup_abort = 1;
1142 // FALL THROUGH
1143 case GADGETFS_CONNECT:
1144 dev->ev_next = 0;
1145 break;
1146 case GADGETFS_SETUP: /* previous request timed out */
1147 case GADGETFS_SUSPEND: /* same effect */
1148 /* these events can't be repeated */
1149 for (i = 0; i != dev->ev_next; i++) {
1150 if (dev->event [i].type != type)
1151 continue;
1152 DBG(dev, "discard old event[%d] %d\n", i, type);
1153 dev->ev_next--;
1154 if (i == dev->ev_next)
1155 break;
1156 /* indices start at zero, for simplicity */
1157 memmove (&dev->event [i], &dev->event [i + 1],
1158 sizeof (struct usb_gadgetfs_event)
1159 * (dev->ev_next - i));
1160 }
1161 break;
1162 default:
1163 BUG ();
1164 }
1165 VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type);
1166 event = &dev->event [dev->ev_next++];
1167 BUG_ON (dev->ev_next > N_EVENT);
1168 memset (event, 0, sizeof *event);
1169 event->type = type;
1170 return event;
1171 }
1172
1173 static ssize_t
1174 ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
1175 {
1176 struct dev_data *dev = fd->private_data;
1177 ssize_t retval = -ESRCH;
1178
1179 spin_lock_irq (&dev->lock);
1180
1181 /* report fd mode change before acting on it */
1182 if (dev->setup_abort) {
1183 dev->setup_abort = 0;
1184 retval = -EIDRM;
1185
1186 /* data and/or status stage for control request */
1187 } else if (dev->state == STATE_DEV_SETUP) {
1188
1189 /* IN DATA+STATUS caller makes len <= wLength */
1190 if (dev->setup_in) {
1191 retval = setup_req (dev->gadget->ep0, dev->req, len);
1192 if (retval == 0) {
1193 dev->state = STATE_DEV_CONNECTED;
1194 spin_unlock_irq (&dev->lock);
1195 if (copy_from_user (dev->req->buf, buf, len))
1196 retval = -EFAULT;
1197 else {
1198 if (len < dev->setup_wLength)
1199 dev->req->zero = 1;
1200 retval = usb_ep_queue (
1201 dev->gadget->ep0, dev->req,
1202 GFP_KERNEL);
1203 }
1204 if (retval < 0) {
1205 spin_lock_irq (&dev->lock);
1206 clean_req (dev->gadget->ep0, dev->req);
1207 spin_unlock_irq (&dev->lock);
1208 } else
1209 retval = len;
1210
1211 return retval;
1212 }
1213
1214 /* can stall some OUT transfers */
1215 } else if (dev->setup_can_stall) {
1216 VDEBUG(dev, "ep0out stall\n");
1217 (void) usb_ep_set_halt (dev->gadget->ep0);
1218 retval = -EL2HLT;
1219 dev->state = STATE_DEV_CONNECTED;
1220 } else {
1221 DBG(dev, "bogus ep0out stall!\n");
1222 }
1223 } else
1224 DBG (dev, "fail %s, state %d\n", __FUNCTION__, dev->state);
1225
1226 spin_unlock_irq (&dev->lock);
1227 return retval;
1228 }
1229
1230 static int
1231 ep0_fasync (int f, struct file *fd, int on)
1232 {
1233 struct dev_data *dev = fd->private_data;
1234 // caller must F_SETOWN before signal delivery happens
1235 VDEBUG (dev, "%s %s\n", __FUNCTION__, on ? "on" : "off");
1236 return fasync_helper (f, fd, on, &dev->fasync);
1237 }
1238
1239 static struct usb_gadget_driver gadgetfs_driver;
1240
1241 static int
1242 dev_release (struct inode *inode, struct file *fd)
1243 {
1244 struct dev_data *dev = fd->private_data;
1245
1246 /* closing ep0 === shutdown all */
1247
1248 usb_gadget_unregister_driver (&gadgetfs_driver);
1249
1250 /* at this point "good" hardware has disconnected the
1251 * device from USB; the host won't see it any more.
1252 * alternatively, all host requests will time out.
1253 */
1254
1255 fasync_helper (-1, fd, 0, &dev->fasync);
1256 kfree (dev->buf);
1257 dev->buf = NULL;
1258 put_dev (dev);
1259
1260 /* other endpoints were all decoupled from this device */
1261 spin_lock_irq(&dev->lock);
1262 dev->state = STATE_DEV_DISABLED;
1263 spin_unlock_irq(&dev->lock);
1264 return 0;
1265 }
1266
1267 static unsigned int
1268 ep0_poll (struct file *fd, poll_table *wait)
1269 {
1270 struct dev_data *dev = fd->private_data;
1271 int mask = 0;
1272
1273 poll_wait(fd, &dev->wait, wait);
1274
1275 spin_lock_irq (&dev->lock);
1276
1277 /* report fd mode change before acting on it */
1278 if (dev->setup_abort) {
1279 dev->setup_abort = 0;
1280 mask = POLLHUP;
1281 goto out;
1282 }
1283
1284 if (dev->state == STATE_DEV_SETUP) {
1285 if (dev->setup_in || dev->setup_can_stall)
1286 mask = POLLOUT;
1287 } else {
1288 if (dev->ev_next != 0)
1289 mask = POLLIN;
1290 }
1291 out:
1292 spin_unlock_irq(&dev->lock);
1293 return mask;
1294 }
1295
1296 static int dev_ioctl (struct inode *inode, struct file *fd,
1297 unsigned code, unsigned long value)
1298 {
1299 struct dev_data *dev = fd->private_data;
1300 struct usb_gadget *gadget = dev->gadget;
1301
1302 if (gadget->ops->ioctl)
1303 return gadget->ops->ioctl (gadget, code, value);
1304 return -ENOTTY;
1305 }
1306
1307 /* used after device configuration */
1308 static const struct file_operations ep0_io_operations = {
1309 .owner = THIS_MODULE,
1310 .llseek = no_llseek,
1311
1312 .read = ep0_read,
1313 .write = ep0_write,
1314 .fasync = ep0_fasync,
1315 .poll = ep0_poll,
1316 .ioctl = dev_ioctl,
1317 .release = dev_release,
1318 };
1319
1320 /*----------------------------------------------------------------------*/
1321
1322 /* The in-kernel gadget driver handles most ep0 issues, in particular
1323 * enumerating the single configuration (as provided from user space).
1324 *
1325 * Unrecognized ep0 requests may be handled in user space.
1326 */
1327
1328 #ifdef CONFIG_USB_GADGET_DUALSPEED
1329 static void make_qualifier (struct dev_data *dev)
1330 {
1331 struct usb_qualifier_descriptor qual;
1332 struct usb_device_descriptor *desc;
1333
1334 qual.bLength = sizeof qual;
1335 qual.bDescriptorType = USB_DT_DEVICE_QUALIFIER;
1336 qual.bcdUSB = __constant_cpu_to_le16 (0x0200);
1337
1338 desc = dev->dev;
1339 qual.bDeviceClass = desc->bDeviceClass;
1340 qual.bDeviceSubClass = desc->bDeviceSubClass;
1341 qual.bDeviceProtocol = desc->bDeviceProtocol;
1342
1343 /* assumes ep0 uses the same value for both speeds ... */
1344 qual.bMaxPacketSize0 = desc->bMaxPacketSize0;
1345
1346 qual.bNumConfigurations = 1;
1347 qual.bRESERVED = 0;
1348
1349 memcpy (dev->rbuf, &qual, sizeof qual);
1350 }
1351 #endif
1352
1353 static int
1354 config_buf (struct dev_data *dev, u8 type, unsigned index)
1355 {
1356 int len;
1357 #ifdef CONFIG_USB_GADGET_DUALSPEED
1358 int hs;
1359 #endif
1360
1361 /* only one configuration */
1362 if (index > 0)
1363 return -EINVAL;
1364
1365 #ifdef CONFIG_USB_GADGET_DUALSPEED
1366 hs = (dev->gadget->speed == USB_SPEED_HIGH);
1367 if (type == USB_DT_OTHER_SPEED_CONFIG)
1368 hs = !hs;
1369 if (hs) {
1370 dev->req->buf = dev->hs_config;
1371 len = le16_to_cpup (&dev->hs_config->wTotalLength);
1372 } else
1373 #endif
1374 {
1375 dev->req->buf = dev->config;
1376 len = le16_to_cpup (&dev->config->wTotalLength);
1377 }
1378 ((u8 *)dev->req->buf) [1] = type;
1379 return len;
1380 }
1381
1382 static int
1383 gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1384 {
1385 struct dev_data *dev = get_gadget_data (gadget);
1386 struct usb_request *req = dev->req;
1387 int value = -EOPNOTSUPP;
1388 struct usb_gadgetfs_event *event;
1389 u16 w_value = le16_to_cpu(ctrl->wValue);
1390 u16 w_length = le16_to_cpu(ctrl->wLength);
1391
1392 spin_lock (&dev->lock);
1393 dev->setup_abort = 0;
1394 if (dev->state == STATE_DEV_UNCONNECTED) {
1395
1396 dev->state = STATE_DEV_CONNECTED;
1397 dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket;
1398
1399 #ifdef CONFIG_USB_GADGET_DUALSPEED
1400 if (gadget->speed == USB_SPEED_HIGH && dev->hs_config == 0) {
1401 ERROR (dev, "no high speed config??\n");
1402 return -EINVAL;
1403 }
1404 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1405
1406 INFO (dev, "connected\n");
1407 event = next_event (dev, GADGETFS_CONNECT);
1408 event->u.speed = gadget->speed;
1409 ep0_readable (dev);
1410
1411 /* host may have given up waiting for response. we can miss control
1412 * requests handled lower down (device/endpoint status and features);
1413 * then ep0_{read,write} will report the wrong status. controller
1414 * driver will have aborted pending i/o.
1415 */
1416 } else if (dev->state == STATE_DEV_SETUP)
1417 dev->setup_abort = 1;
1418
1419 req->buf = dev->rbuf;
1420 req->dma = DMA_ADDR_INVALID;
1421 req->context = NULL;
1422 value = -EOPNOTSUPP;
1423 switch (ctrl->bRequest) {
1424
1425 case USB_REQ_GET_DESCRIPTOR:
1426 if (ctrl->bRequestType != USB_DIR_IN)
1427 goto unrecognized;
1428 switch (w_value >> 8) {
1429
1430 case USB_DT_DEVICE:
1431 value = min (w_length, (u16) sizeof *dev->dev);
1432 req->buf = dev->dev;
1433 break;
1434 #ifdef CONFIG_USB_GADGET_DUALSPEED
1435 case USB_DT_DEVICE_QUALIFIER:
1436 if (!dev->hs_config)
1437 break;
1438 value = min (w_length, (u16)
1439 sizeof (struct usb_qualifier_descriptor));
1440 make_qualifier (dev);
1441 break;
1442 case USB_DT_OTHER_SPEED_CONFIG:
1443 // FALLTHROUGH
1444 #endif
1445 case USB_DT_CONFIG:
1446 value = config_buf (dev,
1447 w_value >> 8,
1448 w_value & 0xff);
1449 if (value >= 0)
1450 value = min (w_length, (u16) value);
1451 break;
1452 case USB_DT_STRING:
1453 goto unrecognized;
1454
1455 default: // all others are errors
1456 break;
1457 }
1458 break;
1459
1460 /* currently one config, two speeds */
1461 case USB_REQ_SET_CONFIGURATION:
1462 if (ctrl->bRequestType != 0)
1463 break;
1464 if (0 == (u8) w_value) {
1465 value = 0;
1466 dev->current_config = 0;
1467 usb_gadget_vbus_draw(gadget, 8 /* mA */ );
1468 // user mode expected to disable endpoints
1469 } else {
1470 u8 config, power;
1471 #ifdef CONFIG_USB_GADGET_DUALSPEED
1472 if (gadget->speed == USB_SPEED_HIGH) {
1473 config = dev->hs_config->bConfigurationValue;
1474 power = dev->hs_config->bMaxPower;
1475 } else
1476 #endif
1477 {
1478 config = dev->config->bConfigurationValue;
1479 power = dev->config->bMaxPower;
1480 }
1481
1482 if (config == (u8) w_value) {
1483 value = 0;
1484 dev->current_config = config;
1485 usb_gadget_vbus_draw(gadget, 2 * power);
1486 }
1487 }
1488
1489 /* report SET_CONFIGURATION like any other control request,
1490 * except that usermode may not stall this. the next
1491 * request mustn't be allowed start until this finishes:
1492 * endpoints and threads set up, etc.
1493 *
1494 * NOTE: older PXA hardware (before PXA 255: without UDCCFR)
1495 * has bad/racey automagic that prevents synchronizing here.
1496 * even kernel mode drivers often miss them.
1497 */
1498 if (value == 0) {
1499 INFO (dev, "configuration #%d\n", dev->current_config);
1500 if (dev->usermode_setup) {
1501 dev->setup_can_stall = 0;
1502 goto delegate;
1503 }
1504 }
1505 break;
1506
1507 #ifndef CONFIG_USB_GADGETFS_PXA2XX
1508 /* PXA automagically handles this request too */
1509 case USB_REQ_GET_CONFIGURATION:
1510 if (ctrl->bRequestType != 0x80)
1511 break;
1512 *(u8 *)req->buf = dev->current_config;
1513 value = min (w_length, (u16) 1);
1514 break;
1515 #endif
1516
1517 default:
1518 unrecognized:
1519 VDEBUG (dev, "%s req%02x.%02x v%04x i%04x l%d\n",
1520 dev->usermode_setup ? "delegate" : "fail",
1521 ctrl->bRequestType, ctrl->bRequest,
1522 w_value, le16_to_cpu(ctrl->wIndex), w_length);
1523
1524 /* if there's an ep0 reader, don't stall */
1525 if (dev->usermode_setup) {
1526 dev->setup_can_stall = 1;
1527 delegate:
1528 dev->setup_in = (ctrl->bRequestType & USB_DIR_IN)
1529 ? 1 : 0;
1530 dev->setup_wLength = w_length;
1531 dev->setup_out_ready = 0;
1532 dev->setup_out_error = 0;
1533 value = 0;
1534
1535 /* read DATA stage for OUT right away */
1536 if (unlikely (!dev->setup_in && w_length)) {
1537 value = setup_req (gadget->ep0, dev->req,
1538 w_length);
1539 if (value < 0)
1540 break;
1541 value = usb_ep_queue (gadget->ep0, dev->req,
1542 GFP_ATOMIC);
1543 if (value < 0) {
1544 clean_req (gadget->ep0, dev->req);
1545 break;
1546 }
1547
1548 /* we can't currently stall these */
1549 dev->setup_can_stall = 0;
1550 }
1551
1552 /* state changes when reader collects event */
1553 event = next_event (dev, GADGETFS_SETUP);
1554 event->u.setup = *ctrl;
1555 ep0_readable (dev);
1556 spin_unlock (&dev->lock);
1557 return 0;
1558 }
1559 }
1560
1561 /* proceed with data transfer and status phases? */
1562 if (value >= 0 && dev->state != STATE_DEV_SETUP) {
1563 req->length = value;
1564 req->zero = value < w_length;
1565 value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC);
1566 if (value < 0) {
1567 DBG (dev, "ep_queue --> %d\n", value);
1568 req->status = 0;
1569 }
1570 }
1571
1572 /* device stalls when value < 0 */
1573 spin_unlock (&dev->lock);
1574 return value;
1575 }
1576
1577 static void destroy_ep_files (struct dev_data *dev)
1578 {
1579 struct list_head *entry, *tmp;
1580
1581 DBG (dev, "%s %d\n", __FUNCTION__, dev->state);
1582
1583 /* dev->state must prevent interference */
1584 restart:
1585 spin_lock_irq (&dev->lock);
1586 list_for_each_safe (entry, tmp, &dev->epfiles) {
1587 struct ep_data *ep;
1588 struct inode *parent;
1589 struct dentry *dentry;
1590
1591 /* break link to FS */
1592 ep = list_entry (entry, struct ep_data, epfiles);
1593 list_del_init (&ep->epfiles);
1594 dentry = ep->dentry;
1595 ep->dentry = NULL;
1596 parent = dentry->d_parent->d_inode;
1597
1598 /* break link to controller */
1599 if (ep->state == STATE_EP_ENABLED)
1600 (void) usb_ep_disable (ep->ep);
1601 ep->state = STATE_EP_UNBOUND;
1602 usb_ep_free_request (ep->ep, ep->req);
1603 ep->ep = NULL;
1604 wake_up (&ep->wait);
1605 put_ep (ep);
1606
1607 spin_unlock_irq (&dev->lock);
1608
1609 /* break link to dcache */
1610 mutex_lock (&parent->i_mutex);
1611 d_delete (dentry);
1612 dput (dentry);
1613 mutex_unlock (&parent->i_mutex);
1614
1615 /* fds may still be open */
1616 goto restart;
1617 }
1618 spin_unlock_irq (&dev->lock);
1619 }
1620
1621
1622 static struct inode *
1623 gadgetfs_create_file (struct super_block *sb, char const *name,
1624 void *data, const struct file_operations *fops,
1625 struct dentry **dentry_p);
1626
1627 static int activate_ep_files (struct dev_data *dev)
1628 {
1629 struct usb_ep *ep;
1630 struct ep_data *data;
1631
1632 gadget_for_each_ep (ep, dev->gadget) {
1633
1634 data = kzalloc(sizeof(*data), GFP_KERNEL);
1635 if (!data)
1636 goto enomem0;
1637 data->state = STATE_EP_DISABLED;
1638 init_MUTEX (&data->lock);
1639 init_waitqueue_head (&data->wait);
1640
1641 strncpy (data->name, ep->name, sizeof (data->name) - 1);
1642 atomic_set (&data->count, 1);
1643 data->dev = dev;
1644 get_dev (dev);
1645
1646 data->ep = ep;
1647 ep->driver_data = data;
1648
1649 data->req = usb_ep_alloc_request (ep, GFP_KERNEL);
1650 if (!data->req)
1651 goto enomem1;
1652
1653 data->inode = gadgetfs_create_file (dev->sb, data->name,
1654 data, &ep_config_operations,
1655 &data->dentry);
1656 if (!data->inode)
1657 goto enomem2;
1658 list_add_tail (&data->epfiles, &dev->epfiles);
1659 }
1660 return 0;
1661
1662 enomem2:
1663 usb_ep_free_request (ep, data->req);
1664 enomem1:
1665 put_dev (dev);
1666 kfree (data);
1667 enomem0:
1668 DBG (dev, "%s enomem\n", __FUNCTION__);
1669 destroy_ep_files (dev);
1670 return -ENOMEM;
1671 }
1672
1673 static void
1674 gadgetfs_unbind (struct usb_gadget *gadget)
1675 {
1676 struct dev_data *dev = get_gadget_data (gadget);
1677
1678 DBG (dev, "%s\n", __FUNCTION__);
1679
1680 spin_lock_irq (&dev->lock);
1681 dev->state = STATE_DEV_UNBOUND;
1682 spin_unlock_irq (&dev->lock);
1683
1684 destroy_ep_files (dev);
1685 gadget->ep0->driver_data = NULL;
1686 set_gadget_data (gadget, NULL);
1687
1688 /* we've already been disconnected ... no i/o is active */
1689 if (dev->req)
1690 usb_ep_free_request (gadget->ep0, dev->req);
1691 DBG (dev, "%s done\n", __FUNCTION__);
1692 put_dev (dev);
1693 }
1694
1695 static struct dev_data *the_device;
1696
1697 static int
1698 gadgetfs_bind (struct usb_gadget *gadget)
1699 {
1700 struct dev_data *dev = the_device;
1701
1702 if (!dev)
1703 return -ESRCH;
1704 if (0 != strcmp (CHIP, gadget->name)) {
1705 printk (KERN_ERR "%s expected %s controller not %s\n",
1706 shortname, CHIP, gadget->name);
1707 return -ENODEV;
1708 }
1709
1710 set_gadget_data (gadget, dev);
1711 dev->gadget = gadget;
1712 gadget->ep0->driver_data = dev;
1713 dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket;
1714
1715 /* preallocate control response and buffer */
1716 dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL);
1717 if (!dev->req)
1718 goto enomem;
1719 dev->req->context = NULL;
1720 dev->req->complete = epio_complete;
1721
1722 if (activate_ep_files (dev) < 0)
1723 goto enomem;
1724
1725 INFO (dev, "bound to %s driver\n", gadget->name);
1726 spin_lock_irq(&dev->lock);
1727 dev->state = STATE_DEV_UNCONNECTED;
1728 spin_unlock_irq(&dev->lock);
1729 get_dev (dev);
1730 return 0;
1731
1732 enomem:
1733 gadgetfs_unbind (gadget);
1734 return -ENOMEM;
1735 }
1736
1737 static void
1738 gadgetfs_disconnect (struct usb_gadget *gadget)
1739 {
1740 struct dev_data *dev = get_gadget_data (gadget);
1741
1742 spin_lock (&dev->lock);
1743 if (dev->state == STATE_DEV_UNCONNECTED)
1744 goto exit;
1745 dev->state = STATE_DEV_UNCONNECTED;
1746
1747 INFO (dev, "disconnected\n");
1748 next_event (dev, GADGETFS_DISCONNECT);
1749 ep0_readable (dev);
1750 exit:
1751 spin_unlock (&dev->lock);
1752 }
1753
1754 static void
1755 gadgetfs_suspend (struct usb_gadget *gadget)
1756 {
1757 struct dev_data *dev = get_gadget_data (gadget);
1758
1759 INFO (dev, "suspended from state %d\n", dev->state);
1760 spin_lock (&dev->lock);
1761 switch (dev->state) {
1762 case STATE_DEV_SETUP: // VERY odd... host died??
1763 case STATE_DEV_CONNECTED:
1764 case STATE_DEV_UNCONNECTED:
1765 next_event (dev, GADGETFS_SUSPEND);
1766 ep0_readable (dev);
1767 /* FALLTHROUGH */
1768 default:
1769 break;
1770 }
1771 spin_unlock (&dev->lock);
1772 }
1773
1774 static struct usb_gadget_driver gadgetfs_driver = {
1775 #ifdef CONFIG_USB_GADGET_DUALSPEED
1776 .speed = USB_SPEED_HIGH,
1777 #else
1778 .speed = USB_SPEED_FULL,
1779 #endif
1780 .function = (char *) driver_desc,
1781 .bind = gadgetfs_bind,
1782 .unbind = gadgetfs_unbind,
1783 .setup = gadgetfs_setup,
1784 .disconnect = gadgetfs_disconnect,
1785 .suspend = gadgetfs_suspend,
1786
1787 .driver = {
1788 .name = (char *) shortname,
1789 },
1790 };
1791
1792 /*----------------------------------------------------------------------*/
1793
1794 static void gadgetfs_nop(struct usb_gadget *arg) { }
1795
1796 static int gadgetfs_probe (struct usb_gadget *gadget)
1797 {
1798 CHIP = gadget->name;
1799 return -EISNAM;
1800 }
1801
1802 static struct usb_gadget_driver probe_driver = {
1803 .speed = USB_SPEED_HIGH,
1804 .bind = gadgetfs_probe,
1805 .unbind = gadgetfs_nop,
1806 .setup = (void *)gadgetfs_nop,
1807 .disconnect = gadgetfs_nop,
1808 .driver = {
1809 .name = "nop",
1810 },
1811 };
1812
1813
1814 /* DEVICE INITIALIZATION
1815 *
1816 * fd = open ("/dev/gadget/$CHIP", O_RDWR)
1817 * status = write (fd, descriptors, sizeof descriptors)
1818 *
1819 * That write establishes the device configuration, so the kernel can
1820 * bind to the controller ... guaranteeing it can handle enumeration
1821 * at all necessary speeds. Descriptor order is:
1822 *
1823 * . message tag (u32, host order) ... for now, must be zero; it
1824 * would change to support features like multi-config devices
1825 * . full/low speed config ... all wTotalLength bytes (with interface,
1826 * class, altsetting, endpoint, and other descriptors)
1827 * . high speed config ... all descriptors, for high speed operation;
1828 * this one's optional except for high-speed hardware
1829 * . device descriptor
1830 *
1831 * Endpoints are not yet enabled. Drivers must wait until device
1832 * configuration and interface altsetting changes create
1833 * the need to configure (or unconfigure) them.
1834 *
1835 * After initialization, the device stays active for as long as that
1836 * $CHIP file is open. Events must then be read from that descriptor,
1837 * such as configuration notifications.
1838 */
1839
1840 static int is_valid_config (struct usb_config_descriptor *config)
1841 {
1842 return config->bDescriptorType == USB_DT_CONFIG
1843 && config->bLength == USB_DT_CONFIG_SIZE
1844 && config->bConfigurationValue != 0
1845 && (config->bmAttributes & USB_CONFIG_ATT_ONE) != 0
1846 && (config->bmAttributes & USB_CONFIG_ATT_WAKEUP) == 0;
1847 /* FIXME if gadget->is_otg, _must_ include an otg descriptor */
1848 /* FIXME check lengths: walk to end */
1849 }
1850
1851 static ssize_t
1852 dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
1853 {
1854 struct dev_data *dev = fd->private_data;
1855 ssize_t value = len, length = len;
1856 unsigned total;
1857 u32 tag;
1858 char *kbuf;
1859
1860 if (len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4))
1861 return -EINVAL;
1862
1863 /* we might need to change message format someday */
1864 if (copy_from_user (&tag, buf, 4))
1865 return -EFAULT;
1866 if (tag != 0)
1867 return -EINVAL;
1868 buf += 4;
1869 length -= 4;
1870
1871 kbuf = kmalloc (length, GFP_KERNEL);
1872 if (!kbuf)
1873 return -ENOMEM;
1874 if (copy_from_user (kbuf, buf, length)) {
1875 kfree (kbuf);
1876 return -EFAULT;
1877 }
1878
1879 spin_lock_irq (&dev->lock);
1880 value = -EINVAL;
1881 if (dev->buf)
1882 goto fail;
1883 dev->buf = kbuf;
1884
1885 /* full or low speed config */
1886 dev->config = (void *) kbuf;
1887 total = le16_to_cpup (&dev->config->wTotalLength);
1888 if (!is_valid_config (dev->config) || total >= length)
1889 goto fail;
1890 kbuf += total;
1891 length -= total;
1892
1893 /* optional high speed config */
1894 if (kbuf [1] == USB_DT_CONFIG) {
1895 dev->hs_config = (void *) kbuf;
1896 total = le16_to_cpup (&dev->hs_config->wTotalLength);
1897 if (!is_valid_config (dev->hs_config) || total >= length)
1898 goto fail;
1899 kbuf += total;
1900 length -= total;
1901 }
1902
1903 /* could support multiple configs, using another encoding! */
1904
1905 /* device descriptor (tweaked for paranoia) */
1906 if (length != USB_DT_DEVICE_SIZE)
1907 goto fail;
1908 dev->dev = (void *)kbuf;
1909 if (dev->dev->bLength != USB_DT_DEVICE_SIZE
1910 || dev->dev->bDescriptorType != USB_DT_DEVICE
1911 || dev->dev->bNumConfigurations != 1)
1912 goto fail;
1913 dev->dev->bNumConfigurations = 1;
1914 dev->dev->bcdUSB = __constant_cpu_to_le16 (0x0200);
1915
1916 /* triggers gadgetfs_bind(); then we can enumerate. */
1917 spin_unlock_irq (&dev->lock);
1918 value = usb_gadget_register_driver (&gadgetfs_driver);
1919 if (value != 0) {
1920 kfree (dev->buf);
1921 dev->buf = NULL;
1922 } else {
1923 /* at this point "good" hardware has for the first time
1924 * let the USB the host see us. alternatively, if users
1925 * unplug/replug that will clear all the error state.
1926 *
1927 * note: everything running before here was guaranteed
1928 * to choke driver model style diagnostics. from here
1929 * on, they can work ... except in cleanup paths that
1930 * kick in after the ep0 descriptor is closed.
1931 */
1932 fd->f_op = &ep0_io_operations;
1933 value = len;
1934 }
1935 return value;
1936
1937 fail:
1938 spin_unlock_irq (&dev->lock);
1939 pr_debug ("%s: %s fail %Zd, %p\n", shortname, __FUNCTION__, value, dev);
1940 kfree (dev->buf);
1941 dev->buf = NULL;
1942 return value;
1943 }
1944
1945 static int
1946 dev_open (struct inode *inode, struct file *fd)
1947 {
1948 struct dev_data *dev = inode->i_private;
1949 int value = -EBUSY;
1950
1951 spin_lock_irq(&dev->lock);
1952 if (dev->state == STATE_DEV_DISABLED) {
1953 dev->ev_next = 0;
1954 dev->state = STATE_DEV_OPENED;
1955 fd->private_data = dev;
1956 get_dev (dev);
1957 value = 0;
1958 }
1959 spin_unlock_irq(&dev->lock);
1960 return value;
1961 }
1962
1963 static const struct file_operations dev_init_operations = {
1964 .owner = THIS_MODULE,
1965 .llseek = no_llseek,
1966
1967 .open = dev_open,
1968 .write = dev_config,
1969 .fasync = ep0_fasync,
1970 .ioctl = dev_ioctl,
1971 .release = dev_release,
1972 };
1973
1974 /*----------------------------------------------------------------------*/
1975
1976 /* FILESYSTEM AND SUPERBLOCK OPERATIONS
1977 *
1978 * Mounting the filesystem creates a controller file, used first for
1979 * device configuration then later for event monitoring.
1980 */
1981
1982
1983 /* FIXME PAM etc could set this security policy without mount options
1984 * if epfiles inherited ownership and permissons from ep0 ...
1985 */
1986
1987 static unsigned default_uid;
1988 static unsigned default_gid;
1989 static unsigned default_perm = S_IRUSR | S_IWUSR;
1990
1991 module_param (default_uid, uint, 0644);
1992 module_param (default_gid, uint, 0644);
1993 module_param (default_perm, uint, 0644);
1994
1995
1996 static struct inode *
1997 gadgetfs_make_inode (struct super_block *sb,
1998 void *data, const struct file_operations *fops,
1999 int mode)
2000 {
2001 struct inode *inode = new_inode (sb);
2002
2003 if (inode) {
2004 inode->i_mode = mode;
2005 inode->i_uid = default_uid;
2006 inode->i_gid = default_gid;
2007 inode->i_blocks = 0;
2008 inode->i_atime = inode->i_mtime = inode->i_ctime
2009 = CURRENT_TIME;
2010 inode->i_private = data;
2011 inode->i_fop = fops;
2012 }
2013 return inode;
2014 }
2015
2016 /* creates in fs root directory, so non-renamable and non-linkable.
2017 * so inode and dentry are paired, until device reconfig.
2018 */
2019 static struct inode *
2020 gadgetfs_create_file (struct super_block *sb, char const *name,
2021 void *data, const struct file_operations *fops,
2022 struct dentry **dentry_p)
2023 {
2024 struct dentry *dentry;
2025 struct inode *inode;
2026
2027 dentry = d_alloc_name(sb->s_root, name);
2028 if (!dentry)
2029 return NULL;
2030
2031 inode = gadgetfs_make_inode (sb, data, fops,
2032 S_IFREG | (default_perm & S_IRWXUGO));
2033 if (!inode) {
2034 dput(dentry);
2035 return NULL;
2036 }
2037 d_add (dentry, inode);
2038 *dentry_p = dentry;
2039 return inode;
2040 }
2041
2042 static struct super_operations gadget_fs_operations = {
2043 .statfs = simple_statfs,
2044 .drop_inode = generic_delete_inode,
2045 };
2046
2047 static int
2048 gadgetfs_fill_super (struct super_block *sb, void *opts, int silent)
2049 {
2050 struct inode *inode;
2051 struct dentry *d;
2052 struct dev_data *dev;
2053
2054 if (the_device)
2055 return -ESRCH;
2056
2057 /* fake probe to determine $CHIP */
2058 (void) usb_gadget_register_driver (&probe_driver);
2059 if (!CHIP)
2060 return -ENODEV;
2061
2062 /* superblock */
2063 sb->s_blocksize = PAGE_CACHE_SIZE;
2064 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2065 sb->s_magic = GADGETFS_MAGIC;
2066 sb->s_op = &gadget_fs_operations;
2067 sb->s_time_gran = 1;
2068
2069 /* root inode */
2070 inode = gadgetfs_make_inode (sb,
2071 NULL, &simple_dir_operations,
2072 S_IFDIR | S_IRUGO | S_IXUGO);
2073 if (!inode)
2074 goto enomem0;
2075 inode->i_op = &simple_dir_inode_operations;
2076 if (!(d = d_alloc_root (inode)))
2077 goto enomem1;
2078 sb->s_root = d;
2079
2080 /* the ep0 file is named after the controller we expect;
2081 * user mode code can use it for sanity checks, like we do.
2082 */
2083 dev = dev_new ();
2084 if (!dev)
2085 goto enomem2;
2086
2087 dev->sb = sb;
2088 if (!gadgetfs_create_file (sb, CHIP,
2089 dev, &dev_init_operations,
2090 &dev->dentry))
2091 goto enomem3;
2092
2093 /* other endpoint files are available after hardware setup,
2094 * from binding to a controller.
2095 */
2096 the_device = dev;
2097 return 0;
2098
2099 enomem3:
2100 put_dev (dev);
2101 enomem2:
2102 dput (d);
2103 enomem1:
2104 iput (inode);
2105 enomem0:
2106 return -ENOMEM;
2107 }
2108
2109 /* "mount -t gadgetfs path /dev/gadget" ends up here */
2110 static int
2111 gadgetfs_get_sb (struct file_system_type *t, int flags,
2112 const char *path, void *opts, struct vfsmount *mnt)
2113 {
2114 return get_sb_single (t, flags, opts, gadgetfs_fill_super, mnt);
2115 }
2116
2117 static void
2118 gadgetfs_kill_sb (struct super_block *sb)
2119 {
2120 kill_litter_super (sb);
2121 if (the_device) {
2122 put_dev (the_device);
2123 the_device = NULL;
2124 }
2125 }
2126
2127 /*----------------------------------------------------------------------*/
2128
2129 static struct file_system_type gadgetfs_type = {
2130 .owner = THIS_MODULE,
2131 .name = shortname,
2132 .get_sb = gadgetfs_get_sb,
2133 .kill_sb = gadgetfs_kill_sb,
2134 };
2135
2136 /*----------------------------------------------------------------------*/
2137
2138 static int __init init (void)
2139 {
2140 int status;
2141
2142 status = register_filesystem (&gadgetfs_type);
2143 if (status == 0)
2144 pr_info ("%s: %s, version " DRIVER_VERSION "\n",
2145 shortname, driver_desc);
2146 return status;
2147 }
2148 module_init (init);
2149
2150 static void __exit cleanup (void)
2151 {
2152 pr_debug ("unregister %s\n", shortname);
2153 unregister_filesystem (&gadgetfs_type);
2154 }
2155 module_exit (cleanup);
2156
WandBoard kernel