]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
a4e3ef55 | 23 | /* #define VERBOSE_DEBUG */ |
1da177e4 LT |
24 | |
25 | #include <linux/init.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/fs.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/uts.h> | |
30 | #include <linux/wait.h> | |
31 | #include <linux/compiler.h> | |
32 | #include <asm/uaccess.h> | |
a99bbaf5 | 33 | #include <linux/sched.h> |
1da177e4 | 34 | #include <linux/slab.h> |
e22fc27c | 35 | #include <linux/poll.h> |
1da177e4 LT |
36 | |
37 | #include <linux/device.h> | |
38 | #include <linux/moduleparam.h> | |
39 | ||
a5262dcf | 40 | #include <linux/usb/gadgetfs.h> |
9454a57a | 41 | #include <linux/usb/gadget.h> |
1da177e4 LT |
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/$CHIP is configured | |
58 | * (by writing configuration and device descriptors). Afterwards it | |
59 | * may serve as a source of device events, used to handle all control | |
60 | * requests other than basic enumeration. | |
61 | * | |
511779fd PE |
62 | * - Then, after a SET_CONFIGURATION control request, ep_config() is |
63 | * called when each /dev/gadget/ep* file is configured (by writing | |
64 | * endpoint descriptors). Afterwards these files are used to write() | |
65 | * IN data or to read() OUT data. To halt the endpoint, a "wrong | |
66 | * direction" request is issued (like reading an IN endpoint). | |
1da177e4 LT |
67 | * |
68 | * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe | |
69 | * not possible on all hardware. For example, precise fault handling with | |
70 | * respect to data left in endpoint fifos after aborted operations; or | |
71 | * selective clearing of endpoint halts, to implement SET_INTERFACE. | |
72 | */ | |
73 | ||
74 | #define DRIVER_DESC "USB Gadget filesystem" | |
75 | #define DRIVER_VERSION "24 Aug 2004" | |
76 | ||
77 | static const char driver_desc [] = DRIVER_DESC; | |
78 | static const char shortname [] = "gadgetfs"; | |
79 | ||
80 | MODULE_DESCRIPTION (DRIVER_DESC); | |
81 | MODULE_AUTHOR ("David Brownell"); | |
82 | MODULE_LICENSE ("GPL"); | |
83 | ||
84 | ||
85 | /*----------------------------------------------------------------------*/ | |
86 | ||
87 | #define GADGETFS_MAGIC 0xaee71ee7 | |
88 | #define DMA_ADDR_INVALID (~(dma_addr_t)0) | |
89 | ||
90 | /* /dev/gadget/$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 | */ | |
7489d149 | 101 | STATE_DEV_OPENED, |
1da177e4 LT |
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 | */ | |
7489d149 DB |
108 | STATE_DEV_UNCONNECTED, |
109 | STATE_DEV_CONNECTED, | |
110 | STATE_DEV_SETUP, | |
1da177e4 LT |
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; | |
7489d149 | 124 | enum ep0_state state; /* P: lock */ |
1da177e4 LT |
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; | |
97906369 | 139 | unsigned setup_wLength; |
1da177e4 LT |
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 | ||
7039f422 | 174 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
175 | if (!dev) |
176 | return NULL; | |
1da177e4 LT |
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, | |
1da177e4 LT |
191 | STATE_EP_ENABLED, |
192 | STATE_EP_UNBOUND, | |
193 | }; | |
194 | ||
195 | struct ep_data { | |
a79df50b | 196 | struct mutex lock; |
1da177e4 LT |
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)); | |
1da177e4 LT |
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 | ||
a4e3ef55 | 256 | #ifdef VERBOSE_DEBUG |
1da177e4 LT |
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) | |
1da177e4 LT |
265 | #define INFO(dev,fmt,args...) \ |
266 | xprintk(dev , KERN_INFO , fmt , ## args) | |
267 | ||
268 | ||
269 | /*----------------------------------------------------------------------*/ | |
270 | ||
271 | /* SYNCHRONOUS ENDPOINT OPERATIONS (bulk/intr/iso) | |
272 | * | |
273 | * After opening, configure non-control endpoints. Then use normal | |
274 | * stream read() and write() requests; and maybe ioctl() to get more | |
093cf723 | 275 | * precise FIFO status when recovering from cancellation. |
1da177e4 LT |
276 | */ |
277 | ||
278 | static void epio_complete (struct usb_ep *ep, struct usb_request *req) | |
279 | { | |
280 | struct ep_data *epdata = ep->driver_data; | |
281 | ||
282 | if (!req->context) | |
283 | return; | |
284 | if (req->status) | |
285 | epdata->status = req->status; | |
286 | else | |
287 | epdata->status = req->actual; | |
288 | complete ((struct completion *)req->context); | |
289 | } | |
290 | ||
291 | /* tasklock endpoint, returning when it's connected. | |
292 | * still need dev->lock to use epdata->ep. | |
293 | */ | |
294 | static int | |
295 | get_ready_ep (unsigned f_flags, struct ep_data *epdata) | |
296 | { | |
297 | int val; | |
298 | ||
299 | if (f_flags & O_NONBLOCK) { | |
a79df50b | 300 | if (!mutex_trylock(&epdata->lock)) |
1da177e4 LT |
301 | goto nonblock; |
302 | if (epdata->state != STATE_EP_ENABLED) { | |
a79df50b | 303 | mutex_unlock(&epdata->lock); |
1da177e4 LT |
304 | nonblock: |
305 | val = -EAGAIN; | |
306 | } else | |
307 | val = 0; | |
308 | return val; | |
309 | } | |
310 | ||
a79df50b TG |
311 | val = mutex_lock_interruptible(&epdata->lock); |
312 | if (val < 0) | |
1da177e4 | 313 | return val; |
511779fd | 314 | |
1da177e4 LT |
315 | switch (epdata->state) { |
316 | case STATE_EP_ENABLED: | |
317 | break; | |
1da177e4 LT |
318 | // case STATE_EP_DISABLED: /* "can't happen" */ |
319 | // case STATE_EP_READY: /* "can't happen" */ | |
320 | default: /* error! */ | |
321 | pr_debug ("%s: ep %p not available, state %d\n", | |
322 | shortname, epdata, epdata->state); | |
323 | // FALLTHROUGH | |
324 | case STATE_EP_UNBOUND: /* clean disconnect */ | |
325 | val = -ENODEV; | |
a79df50b | 326 | mutex_unlock(&epdata->lock); |
1da177e4 LT |
327 | } |
328 | return val; | |
329 | } | |
330 | ||
331 | static ssize_t | |
332 | ep_io (struct ep_data *epdata, void *buf, unsigned len) | |
333 | { | |
6e9a4738 | 334 | DECLARE_COMPLETION_ONSTACK (done); |
1da177e4 LT |
335 | int value; |
336 | ||
337 | spin_lock_irq (&epdata->dev->lock); | |
338 | if (likely (epdata->ep != NULL)) { | |
339 | struct usb_request *req = epdata->req; | |
340 | ||
341 | req->context = &done; | |
342 | req->complete = epio_complete; | |
343 | req->buf = buf; | |
344 | req->length = len; | |
345 | value = usb_ep_queue (epdata->ep, req, GFP_ATOMIC); | |
346 | } else | |
347 | value = -ENODEV; | |
348 | spin_unlock_irq (&epdata->dev->lock); | |
349 | ||
350 | if (likely (value == 0)) { | |
351 | value = wait_event_interruptible (done.wait, done.done); | |
352 | if (value != 0) { | |
353 | spin_lock_irq (&epdata->dev->lock); | |
354 | if (likely (epdata->ep != NULL)) { | |
355 | DBG (epdata->dev, "%s i/o interrupted\n", | |
356 | epdata->name); | |
357 | usb_ep_dequeue (epdata->ep, epdata->req); | |
358 | spin_unlock_irq (&epdata->dev->lock); | |
359 | ||
360 | wait_event (done.wait, done.done); | |
361 | if (epdata->status == -ECONNRESET) | |
362 | epdata->status = -EINTR; | |
363 | } else { | |
364 | spin_unlock_irq (&epdata->dev->lock); | |
365 | ||
366 | DBG (epdata->dev, "endpoint gone\n"); | |
367 | epdata->status = -ENODEV; | |
368 | } | |
369 | } | |
370 | return epdata->status; | |
371 | } | |
372 | return value; | |
373 | } | |
374 | ||
375 | ||
376 | /* handle a synchronous OUT bulk/intr/iso transfer */ | |
377 | static ssize_t | |
378 | ep_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) | |
379 | { | |
380 | struct ep_data *data = fd->private_data; | |
381 | void *kbuf; | |
382 | ssize_t value; | |
383 | ||
384 | if ((value = get_ready_ep (fd->f_flags, data)) < 0) | |
385 | return value; | |
386 | ||
387 | /* halt any endpoint by doing a "wrong direction" i/o call */ | |
fa4c86a0 | 388 | if (usb_endpoint_dir_in(&data->desc)) { |
00cc7a5f AK |
389 | if (usb_endpoint_xfer_isoc(&data->desc)) { |
390 | mutex_unlock(&data->lock); | |
1da177e4 | 391 | return -EINVAL; |
00cc7a5f | 392 | } |
1da177e4 LT |
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); | |
a79df50b | 398 | mutex_unlock(&data->lock); |
1da177e4 LT |
399 | return -EBADMSG; |
400 | } | |
401 | ||
402 | /* FIXME readahead for O_NONBLOCK and poll(); careful with ZLPs */ | |
403 | ||
404 | value = -ENOMEM; | |
e94b1766 | 405 | kbuf = kmalloc (len, GFP_KERNEL); |
1da177e4 LT |
406 | if (unlikely (!kbuf)) |
407 | goto free1; | |
408 | ||
409 | value = ep_io (data, kbuf, len); | |
1bbc1696 DB |
410 | VDEBUG (data->dev, "%s read %zu OUT, status %d\n", |
411 | data->name, len, (int) value); | |
1da177e4 LT |
412 | if (value >= 0 && copy_to_user (buf, kbuf, value)) |
413 | value = -EFAULT; | |
414 | ||
415 | free1: | |
a79df50b | 416 | mutex_unlock(&data->lock); |
1da177e4 LT |
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 */ | |
fa4c86a0 | 433 | if (!usb_endpoint_dir_in(&data->desc)) { |
38981158 AK |
434 | if (usb_endpoint_xfer_isoc(&data->desc)) { |
435 | mutex_unlock(&data->lock); | |
1da177e4 | 436 | return -EINVAL; |
38981158 | 437 | } |
1da177e4 LT |
438 | DBG (data->dev, "%s halt\n", data->name); |
439 | spin_lock_irq (&data->dev->lock); | |
440 | if (likely (data->ep != NULL)) | |
441 | usb_ep_set_halt (data->ep); | |
442 | spin_unlock_irq (&data->dev->lock); | |
a79df50b | 443 | mutex_unlock(&data->lock); |
1da177e4 LT |
444 | return -EBADMSG; |
445 | } | |
446 | ||
447 | /* FIXME writebehind for O_NONBLOCK and poll(), qlen = 1 */ | |
448 | ||
449 | value = -ENOMEM; | |
e94b1766 | 450 | kbuf = kmalloc (len, GFP_KERNEL); |
1da177e4 LT |
451 | if (!kbuf) |
452 | goto free1; | |
453 | if (copy_from_user (kbuf, buf, len)) { | |
454 | value = -EFAULT; | |
455 | goto free1; | |
456 | } | |
457 | ||
458 | value = ep_io (data, kbuf, len); | |
1bbc1696 DB |
459 | VDEBUG (data->dev, "%s write %zu IN, status %d\n", |
460 | data->name, len, (int) value); | |
1da177e4 | 461 | free1: |
a79df50b | 462 | mutex_unlock(&data->lock); |
1da177e4 LT |
463 | kfree (kbuf); |
464 | return value; | |
465 | } | |
466 | ||
467 | static int | |
468 | ep_release (struct inode *inode, struct file *fd) | |
469 | { | |
470 | struct ep_data *data = fd->private_data; | |
ba307f58 MS |
471 | int value; |
472 | ||
a79df50b TG |
473 | value = mutex_lock_interruptible(&data->lock); |
474 | if (value < 0) | |
ba307f58 | 475 | return value; |
1da177e4 LT |
476 | |
477 | /* clean up if this can be reopened */ | |
478 | if (data->state != STATE_EP_UNBOUND) { | |
479 | data->state = STATE_EP_DISABLED; | |
480 | data->desc.bDescriptorType = 0; | |
481 | data->hs_desc.bDescriptorType = 0; | |
4809ecc2 | 482 | usb_ep_disable(data->ep); |
1da177e4 | 483 | } |
a79df50b | 484 | mutex_unlock(&data->lock); |
1da177e4 LT |
485 | put_ep (data); |
486 | return 0; | |
487 | } | |
488 | ||
44c389a0 | 489 | static long ep_ioctl(struct file *fd, unsigned code, unsigned long value) |
1da177e4 LT |
490 | { |
491 | struct ep_data *data = fd->private_data; | |
492 | int status; | |
493 | ||
494 | if ((status = get_ready_ep (fd->f_flags, data)) < 0) | |
495 | return status; | |
496 | ||
497 | spin_lock_irq (&data->dev->lock); | |
498 | if (likely (data->ep != NULL)) { | |
499 | switch (code) { | |
500 | case GADGETFS_FIFO_STATUS: | |
501 | status = usb_ep_fifo_status (data->ep); | |
502 | break; | |
503 | case GADGETFS_FIFO_FLUSH: | |
504 | usb_ep_fifo_flush (data->ep); | |
505 | break; | |
506 | case GADGETFS_CLEAR_HALT: | |
507 | status = usb_ep_clear_halt (data->ep); | |
508 | break; | |
509 | default: | |
510 | status = -ENOTTY; | |
511 | } | |
512 | } else | |
513 | status = -ENODEV; | |
514 | spin_unlock_irq (&data->dev->lock); | |
a79df50b | 515 | mutex_unlock(&data->lock); |
1da177e4 LT |
516 | return status; |
517 | } | |
518 | ||
519 | /*----------------------------------------------------------------------*/ | |
520 | ||
521 | /* ASYNCHRONOUS ENDPOINT I/O OPERATIONS (bulk/intr/iso) */ | |
522 | ||
523 | struct kiocb_priv { | |
524 | struct usb_request *req; | |
525 | struct ep_data *epdata; | |
526 | void *buf; | |
027445c3 BP |
527 | const struct iovec *iv; |
528 | unsigned long nr_segs; | |
1da177e4 LT |
529 | unsigned actual; |
530 | }; | |
531 | ||
532 | static int ep_aio_cancel(struct kiocb *iocb, struct io_event *e) | |
533 | { | |
534 | struct kiocb_priv *priv = iocb->private; | |
535 | struct ep_data *epdata; | |
536 | int value; | |
537 | ||
538 | local_irq_disable(); | |
539 | epdata = priv->epdata; | |
540 | // spin_lock(&epdata->dev->lock); | |
541 | kiocbSetCancelled(iocb); | |
542 | if (likely(epdata && epdata->ep && priv->req)) | |
543 | value = usb_ep_dequeue (epdata->ep, priv->req); | |
544 | else | |
545 | value = -EINVAL; | |
546 | // spin_unlock(&epdata->dev->lock); | |
547 | local_irq_enable(); | |
548 | ||
549 | aio_put_req(iocb); | |
550 | return value; | |
551 | } | |
552 | ||
553 | static ssize_t ep_aio_read_retry(struct kiocb *iocb) | |
554 | { | |
555 | struct kiocb_priv *priv = iocb->private; | |
027445c3 | 556 | ssize_t len, total; |
50f97a1f | 557 | void *to_copy; |
027445c3 BP |
558 | int i; |
559 | ||
2505107d DB |
560 | /* we "retry" to get the right mm context for this: */ |
561 | ||
562 | /* copy stuff into user buffers */ | |
563 | total = priv->actual; | |
564 | len = 0; | |
50f97a1f | 565 | to_copy = priv->buf; |
2505107d DB |
566 | for (i=0; i < priv->nr_segs; i++) { |
567 | ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total); | |
568 | ||
50f97a1f | 569 | if (copy_to_user(priv->iv[i].iov_base, to_copy, this)) { |
2505107d DB |
570 | if (len == 0) |
571 | len = -EFAULT; | |
572 | break; | |
573 | } | |
574 | ||
575 | total -= this; | |
576 | len += this; | |
50f97a1f | 577 | to_copy += this; |
2505107d DB |
578 | if (total == 0) |
579 | break; | |
580 | } | |
581 | kfree(priv->buf); | |
582 | kfree(priv); | |
2505107d | 583 | return len; |
1da177e4 LT |
584 | } |
585 | ||
586 | static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req) | |
587 | { | |
588 | struct kiocb *iocb = req->context; | |
589 | struct kiocb_priv *priv = iocb->private; | |
590 | struct ep_data *epdata = priv->epdata; | |
591 | ||
592 | /* lock against disconnect (and ideally, cancel) */ | |
593 | spin_lock(&epdata->dev->lock); | |
594 | priv->req = NULL; | |
595 | priv->epdata = NULL; | |
49631ca7 AS |
596 | |
597 | /* if this was a write or a read returning no data then we | |
598 | * don't need to copy anything to userspace, so we can | |
599 | * complete the aio request immediately. | |
600 | */ | |
601 | if (priv->iv == NULL || unlikely(req->actual == 0)) { | |
1da177e4 LT |
602 | kfree(req->buf); |
603 | kfree(priv); | |
604 | iocb->private = NULL; | |
605 | /* aio_complete() reports bytes-transferred _and_ faults */ | |
49631ca7 | 606 | aio_complete(iocb, req->actual ? req->actual : req->status, |
1da177e4 LT |
607 | req->status); |
608 | } else { | |
609 | /* retry() won't report both; so we hide some faults */ | |
610 | if (unlikely(0 != req->status)) | |
611 | DBG(epdata->dev, "%s fault %d len %d\n", | |
612 | ep->name, req->status, req->actual); | |
613 | ||
614 | priv->buf = req->buf; | |
615 | priv->actual = req->actual; | |
616 | kick_iocb(iocb); | |
617 | } | |
618 | spin_unlock(&epdata->dev->lock); | |
619 | ||
620 | usb_ep_free_request(ep, req); | |
621 | put_ep(epdata); | |
622 | } | |
623 | ||
624 | static ssize_t | |
625 | ep_aio_rwtail( | |
626 | struct kiocb *iocb, | |
627 | char *buf, | |
628 | size_t len, | |
629 | struct ep_data *epdata, | |
027445c3 | 630 | const struct iovec *iv, |
2505107d | 631 | unsigned long nr_segs |
1da177e4 LT |
632 | ) |
633 | { | |
83196b52 | 634 | struct kiocb_priv *priv; |
1da177e4 LT |
635 | struct usb_request *req; |
636 | ssize_t value; | |
637 | ||
638 | priv = kmalloc(sizeof *priv, GFP_KERNEL); | |
639 | if (!priv) { | |
640 | value = -ENOMEM; | |
641 | fail: | |
642 | kfree(buf); | |
643 | return value; | |
644 | } | |
645 | iocb->private = priv; | |
027445c3 BP |
646 | priv->iv = iv; |
647 | priv->nr_segs = nr_segs; | |
1da177e4 LT |
648 | |
649 | value = get_ready_ep(iocb->ki_filp->f_flags, epdata); | |
650 | if (unlikely(value < 0)) { | |
651 | kfree(priv); | |
652 | goto fail; | |
653 | } | |
654 | ||
655 | iocb->ki_cancel = ep_aio_cancel; | |
656 | get_ep(epdata); | |
657 | priv->epdata = epdata; | |
658 | priv->actual = 0; | |
659 | ||
660 | /* each kiocb is coupled to one usb_request, but we can't | |
661 | * allocate or submit those if the host disconnected. | |
662 | */ | |
663 | spin_lock_irq(&epdata->dev->lock); | |
664 | if (likely(epdata->ep)) { | |
665 | req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC); | |
666 | if (likely(req)) { | |
667 | priv->req = req; | |
668 | req->buf = buf; | |
669 | req->length = len; | |
670 | req->complete = ep_aio_complete; | |
671 | req->context = iocb; | |
672 | value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC); | |
673 | if (unlikely(0 != value)) | |
674 | usb_ep_free_request(epdata->ep, req); | |
675 | } else | |
676 | value = -EAGAIN; | |
677 | } else | |
678 | value = -ENODEV; | |
679 | spin_unlock_irq(&epdata->dev->lock); | |
680 | ||
a79df50b | 681 | mutex_unlock(&epdata->lock); |
1da177e4 LT |
682 | |
683 | if (unlikely(value)) { | |
684 | kfree(priv); | |
685 | put_ep(epdata); | |
686 | } else | |
027445c3 | 687 | value = (iv ? -EIOCBRETRY : -EIOCBQUEUED); |
1da177e4 LT |
688 | return value; |
689 | } | |
690 | ||
691 | static ssize_t | |
027445c3 BP |
692 | ep_aio_read(struct kiocb *iocb, const struct iovec *iov, |
693 | unsigned long nr_segs, loff_t o) | |
1da177e4 LT |
694 | { |
695 | struct ep_data *epdata = iocb->ki_filp->private_data; | |
696 | char *buf; | |
697 | ||
fa4c86a0 | 698 | if (unlikely(usb_endpoint_dir_in(&epdata->desc))) |
1da177e4 | 699 | return -EINVAL; |
027445c3 BP |
700 | |
701 | buf = kmalloc(iocb->ki_left, GFP_KERNEL); | |
1da177e4 LT |
702 | if (unlikely(!buf)) |
703 | return -ENOMEM; | |
027445c3 | 704 | |
1da177e4 | 705 | iocb->ki_retry = ep_aio_read_retry; |
027445c3 | 706 | return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs); |
1da177e4 LT |
707 | } |
708 | ||
709 | static ssize_t | |
027445c3 BP |
710 | ep_aio_write(struct kiocb *iocb, const struct iovec *iov, |
711 | unsigned long nr_segs, loff_t o) | |
1da177e4 LT |
712 | { |
713 | struct ep_data *epdata = iocb->ki_filp->private_data; | |
714 | char *buf; | |
027445c3 BP |
715 | size_t len = 0; |
716 | int i = 0; | |
1da177e4 | 717 | |
fa4c86a0 | 718 | if (unlikely(!usb_endpoint_dir_in(&epdata->desc))) |
1da177e4 | 719 | return -EINVAL; |
027445c3 BP |
720 | |
721 | buf = kmalloc(iocb->ki_left, GFP_KERNEL); | |
1da177e4 LT |
722 | if (unlikely(!buf)) |
723 | return -ENOMEM; | |
027445c3 BP |
724 | |
725 | for (i=0; i < nr_segs; i++) { | |
726 | if (unlikely(copy_from_user(&buf[len], iov[i].iov_base, | |
727 | iov[i].iov_len) != 0)) { | |
728 | kfree(buf); | |
729 | return -EFAULT; | |
730 | } | |
731 | len += iov[i].iov_len; | |
1da177e4 | 732 | } |
027445c3 | 733 | return ep_aio_rwtail(iocb, buf, len, epdata, NULL, 0); |
1da177e4 LT |
734 | } |
735 | ||
736 | /*----------------------------------------------------------------------*/ | |
737 | ||
738 | /* used after endpoint configuration */ | |
066202dd | 739 | static const struct file_operations ep_io_operations = { |
1da177e4 LT |
740 | .owner = THIS_MODULE, |
741 | .llseek = no_llseek, | |
742 | ||
743 | .read = ep_read, | |
744 | .write = ep_write, | |
44c389a0 | 745 | .unlocked_ioctl = ep_ioctl, |
1da177e4 LT |
746 | .release = ep_release, |
747 | ||
748 | .aio_read = ep_aio_read, | |
749 | .aio_write = ep_aio_write, | |
750 | }; | |
751 | ||
752 | /* ENDPOINT INITIALIZATION | |
753 | * | |
754 | * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR) | |
755 | * status = write (fd, descriptors, sizeof descriptors) | |
756 | * | |
757 | * That write establishes the endpoint configuration, configuring | |
758 | * the controller to process bulk, interrupt, or isochronous transfers | |
759 | * at the right maxpacket size, and so on. | |
760 | * | |
761 | * The descriptors are message type 1, identified by a host order u32 | |
762 | * at the beginning of what's written. Descriptor order is: full/low | |
763 | * speed descriptor, then optional high speed descriptor. | |
764 | */ | |
765 | static ssize_t | |
766 | ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) | |
767 | { | |
768 | struct ep_data *data = fd->private_data; | |
769 | struct usb_ep *ep; | |
770 | u32 tag; | |
8a7471ab | 771 | int value, length = len; |
1da177e4 | 772 | |
a79df50b TG |
773 | value = mutex_lock_interruptible(&data->lock); |
774 | if (value < 0) | |
1da177e4 LT |
775 | return value; |
776 | ||
777 | if (data->state != STATE_EP_READY) { | |
778 | value = -EL2HLT; | |
779 | goto fail; | |
780 | } | |
781 | ||
782 | value = len; | |
783 | if (len < USB_DT_ENDPOINT_SIZE + 4) | |
784 | goto fail0; | |
785 | ||
786 | /* we might need to change message format someday */ | |
787 | if (copy_from_user (&tag, buf, 4)) { | |
788 | goto fail1; | |
789 | } | |
790 | if (tag != 1) { | |
791 | DBG(data->dev, "config %s, bad tag %d\n", data->name, tag); | |
792 | goto fail0; | |
793 | } | |
794 | buf += 4; | |
795 | len -= 4; | |
796 | ||
797 | /* NOTE: audio endpoint extensions not accepted here; | |
798 | * just don't include the extra bytes. | |
799 | */ | |
800 | ||
801 | /* full/low speed descriptor, then high speed */ | |
802 | if (copy_from_user (&data->desc, buf, USB_DT_ENDPOINT_SIZE)) { | |
803 | goto fail1; | |
804 | } | |
805 | if (data->desc.bLength != USB_DT_ENDPOINT_SIZE | |
806 | || data->desc.bDescriptorType != USB_DT_ENDPOINT) | |
807 | goto fail0; | |
808 | if (len != USB_DT_ENDPOINT_SIZE) { | |
809 | if (len != 2 * USB_DT_ENDPOINT_SIZE) | |
810 | goto fail0; | |
811 | if (copy_from_user (&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE, | |
812 | USB_DT_ENDPOINT_SIZE)) { | |
813 | goto fail1; | |
814 | } | |
815 | if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE | |
816 | || data->hs_desc.bDescriptorType | |
817 | != USB_DT_ENDPOINT) { | |
818 | DBG(data->dev, "config %s, bad hs length or type\n", | |
819 | data->name); | |
820 | goto fail0; | |
821 | } | |
822 | } | |
1da177e4 LT |
823 | |
824 | spin_lock_irq (&data->dev->lock); | |
825 | if (data->dev->state == STATE_DEV_UNBOUND) { | |
826 | value = -ENOENT; | |
827 | goto gone; | |
828 | } else if ((ep = data->ep) == NULL) { | |
829 | value = -ENODEV; | |
830 | goto gone; | |
831 | } | |
832 | switch (data->dev->gadget->speed) { | |
833 | case USB_SPEED_LOW: | |
834 | case USB_SPEED_FULL: | |
72c973dd TB |
835 | ep->desc = &data->desc; |
836 | value = usb_ep_enable(ep); | |
1da177e4 LT |
837 | if (value == 0) |
838 | data->state = STATE_EP_ENABLED; | |
839 | break; | |
98416333 | 840 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
841 | case USB_SPEED_HIGH: |
842 | /* fails if caller didn't provide that descriptor... */ | |
72c973dd TB |
843 | ep->desc = &data->hs_desc; |
844 | value = usb_ep_enable(ep); | |
1da177e4 LT |
845 | if (value == 0) |
846 | data->state = STATE_EP_ENABLED; | |
847 | break; | |
848 | #endif | |
849 | default: | |
511779fd | 850 | DBG(data->dev, "unconnected, %s init abandoned\n", |
1da177e4 | 851 | data->name); |
511779fd | 852 | value = -EINVAL; |
1da177e4 | 853 | } |
8a7471ab | 854 | if (value == 0) { |
1da177e4 | 855 | fd->f_op = &ep_io_operations; |
8a7471ab MS |
856 | value = length; |
857 | } | |
1da177e4 LT |
858 | gone: |
859 | spin_unlock_irq (&data->dev->lock); | |
860 | if (value < 0) { | |
861 | fail: | |
862 | data->desc.bDescriptorType = 0; | |
863 | data->hs_desc.bDescriptorType = 0; | |
864 | } | |
a79df50b | 865 | mutex_unlock(&data->lock); |
1da177e4 LT |
866 | return value; |
867 | fail0: | |
868 | value = -EINVAL; | |
869 | goto fail; | |
870 | fail1: | |
871 | value = -EFAULT; | |
872 | goto fail; | |
873 | } | |
874 | ||
875 | static int | |
876 | ep_open (struct inode *inode, struct file *fd) | |
877 | { | |
8e18e294 | 878 | struct ep_data *data = inode->i_private; |
1da177e4 LT |
879 | int value = -EBUSY; |
880 | ||
a79df50b | 881 | if (mutex_lock_interruptible(&data->lock) != 0) |
1da177e4 LT |
882 | return -EINTR; |
883 | spin_lock_irq (&data->dev->lock); | |
884 | if (data->dev->state == STATE_DEV_UNBOUND) | |
885 | value = -ENOENT; | |
886 | else if (data->state == STATE_EP_DISABLED) { | |
887 | value = 0; | |
888 | data->state = STATE_EP_READY; | |
889 | get_ep (data); | |
890 | fd->private_data = data; | |
891 | VDEBUG (data->dev, "%s ready\n", data->name); | |
892 | } else | |
893 | DBG (data->dev, "%s state %d\n", | |
894 | data->name, data->state); | |
895 | spin_unlock_irq (&data->dev->lock); | |
a79df50b | 896 | mutex_unlock(&data->lock); |
1da177e4 LT |
897 | return value; |
898 | } | |
899 | ||
900 | /* used before endpoint configuration */ | |
066202dd | 901 | static const struct file_operations ep_config_operations = { |
1da177e4 LT |
902 | .owner = THIS_MODULE, |
903 | .llseek = no_llseek, | |
904 | ||
905 | .open = ep_open, | |
906 | .write = ep_config, | |
907 | .release = ep_release, | |
908 | }; | |
909 | ||
910 | /*----------------------------------------------------------------------*/ | |
911 | ||
912 | /* EP0 IMPLEMENTATION can be partly in userspace. | |
913 | * | |
914 | * Drivers that use this facility receive various events, including | |
915 | * control requests the kernel doesn't handle. Drivers that don't | |
916 | * use this facility may be too simple-minded for real applications. | |
917 | */ | |
918 | ||
919 | static inline void ep0_readable (struct dev_data *dev) | |
920 | { | |
921 | wake_up (&dev->wait); | |
922 | kill_fasync (&dev->fasync, SIGIO, POLL_IN); | |
923 | } | |
924 | ||
925 | static void clean_req (struct usb_ep *ep, struct usb_request *req) | |
926 | { | |
927 | struct dev_data *dev = ep->driver_data; | |
928 | ||
929 | if (req->buf != dev->rbuf) { | |
9d8bab58 | 930 | kfree(req->buf); |
1da177e4 LT |
931 | req->buf = dev->rbuf; |
932 | req->dma = DMA_ADDR_INVALID; | |
933 | } | |
934 | req->complete = epio_complete; | |
935 | dev->setup_out_ready = 0; | |
936 | } | |
937 | ||
938 | static void ep0_complete (struct usb_ep *ep, struct usb_request *req) | |
939 | { | |
940 | struct dev_data *dev = ep->driver_data; | |
5b89db02 | 941 | unsigned long flags; |
1da177e4 LT |
942 | int free = 1; |
943 | ||
944 | /* for control OUT, data must still get to userspace */ | |
5b89db02 | 945 | spin_lock_irqsave(&dev->lock, flags); |
1da177e4 LT |
946 | if (!dev->setup_in) { |
947 | dev->setup_out_error = (req->status != 0); | |
948 | if (!dev->setup_out_error) | |
949 | free = 0; | |
950 | dev->setup_out_ready = 1; | |
951 | ep0_readable (dev); | |
7489d149 | 952 | } |
1da177e4 LT |
953 | |
954 | /* clean up as appropriate */ | |
955 | if (free && req->buf != &dev->rbuf) | |
956 | clean_req (ep, req); | |
957 | req->complete = epio_complete; | |
5b89db02 | 958 | spin_unlock_irqrestore(&dev->lock, flags); |
1da177e4 LT |
959 | } |
960 | ||
961 | static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len) | |
962 | { | |
963 | struct dev_data *dev = ep->driver_data; | |
964 | ||
965 | if (dev->setup_out_ready) { | |
966 | DBG (dev, "ep0 request busy!\n"); | |
967 | return -EBUSY; | |
968 | } | |
969 | if (len > sizeof (dev->rbuf)) | |
9d8bab58 | 970 | req->buf = kmalloc(len, GFP_ATOMIC); |
a9475226 | 971 | if (req->buf == NULL) { |
1da177e4 LT |
972 | req->buf = dev->rbuf; |
973 | return -ENOMEM; | |
974 | } | |
975 | req->complete = ep0_complete; | |
976 | req->length = len; | |
97906369 | 977 | req->zero = 0; |
1da177e4 LT |
978 | return 0; |
979 | } | |
980 | ||
981 | static ssize_t | |
982 | ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) | |
983 | { | |
984 | struct dev_data *dev = fd->private_data; | |
985 | ssize_t retval; | |
986 | enum ep0_state state; | |
987 | ||
988 | spin_lock_irq (&dev->lock); | |
989 | ||
990 | /* report fd mode change before acting on it */ | |
991 | if (dev->setup_abort) { | |
992 | dev->setup_abort = 0; | |
993 | retval = -EIDRM; | |
994 | goto done; | |
995 | } | |
996 | ||
997 | /* control DATA stage */ | |
7489d149 | 998 | if ((state = dev->state) == STATE_DEV_SETUP) { |
1da177e4 LT |
999 | |
1000 | if (dev->setup_in) { /* stall IN */ | |
1001 | VDEBUG(dev, "ep0in stall\n"); | |
1002 | (void) usb_ep_set_halt (dev->gadget->ep0); | |
1003 | retval = -EL2HLT; | |
7489d149 | 1004 | dev->state = STATE_DEV_CONNECTED; |
1da177e4 LT |
1005 | |
1006 | } else if (len == 0) { /* ack SET_CONFIGURATION etc */ | |
1007 | struct usb_ep *ep = dev->gadget->ep0; | |
1008 | struct usb_request *req = dev->req; | |
1009 | ||
1010 | if ((retval = setup_req (ep, req, 0)) == 0) | |
1011 | retval = usb_ep_queue (ep, req, GFP_ATOMIC); | |
7489d149 | 1012 | dev->state = STATE_DEV_CONNECTED; |
1da177e4 LT |
1013 | |
1014 | /* assume that was SET_CONFIGURATION */ | |
1015 | if (dev->current_config) { | |
1016 | unsigned power; | |
a4e3ef55 DB |
1017 | |
1018 | if (gadget_is_dualspeed(dev->gadget) | |
1019 | && (dev->gadget->speed | |
1020 | == USB_SPEED_HIGH)) | |
1da177e4 LT |
1021 | power = dev->hs_config->bMaxPower; |
1022 | else | |
1da177e4 LT |
1023 | power = dev->config->bMaxPower; |
1024 | usb_gadget_vbus_draw(dev->gadget, 2 * power); | |
1025 | } | |
1026 | ||
1027 | } else { /* collect OUT data */ | |
1028 | if ((fd->f_flags & O_NONBLOCK) != 0 | |
1029 | && !dev->setup_out_ready) { | |
1030 | retval = -EAGAIN; | |
1031 | goto done; | |
1032 | } | |
1033 | spin_unlock_irq (&dev->lock); | |
1034 | retval = wait_event_interruptible (dev->wait, | |
1035 | dev->setup_out_ready != 0); | |
1036 | ||
1037 | /* FIXME state could change from under us */ | |
1038 | spin_lock_irq (&dev->lock); | |
1039 | if (retval) | |
1040 | goto done; | |
5b89db02 DB |
1041 | |
1042 | if (dev->state != STATE_DEV_SETUP) { | |
1043 | retval = -ECANCELED; | |
1044 | goto done; | |
1045 | } | |
1046 | dev->state = STATE_DEV_CONNECTED; | |
1047 | ||
1da177e4 LT |
1048 | if (dev->setup_out_error) |
1049 | retval = -EIO; | |
1050 | else { | |
1051 | len = min (len, (size_t)dev->req->actual); | |
1052 | // FIXME don't call this with the spinlock held ... | |
997694de | 1053 | if (copy_to_user (buf, dev->req->buf, len)) |
1da177e4 LT |
1054 | retval = -EFAULT; |
1055 | clean_req (dev->gadget->ep0, dev->req); | |
1056 | /* NOTE userspace can't yet choose to stall */ | |
1057 | } | |
1058 | } | |
1059 | goto done; | |
1060 | } | |
1061 | ||
1062 | /* else normal: return event data */ | |
1063 | if (len < sizeof dev->event [0]) { | |
1064 | retval = -EINVAL; | |
1065 | goto done; | |
1066 | } | |
1067 | len -= len % sizeof (struct usb_gadgetfs_event); | |
1068 | dev->usermode_setup = 1; | |
1069 | ||
1070 | scan: | |
1071 | /* return queued events right away */ | |
1072 | if (dev->ev_next != 0) { | |
1073 | unsigned i, n; | |
1da177e4 | 1074 | |
1da177e4 | 1075 | n = len / sizeof (struct usb_gadgetfs_event); |
0864c7a9 DB |
1076 | if (dev->ev_next < n) |
1077 | n = dev->ev_next; | |
1da177e4 | 1078 | |
0864c7a9 | 1079 | /* ep0 i/o has special semantics during STATE_DEV_SETUP */ |
1da177e4 LT |
1080 | for (i = 0; i < n; i++) { |
1081 | if (dev->event [i].type == GADGETFS_SETUP) { | |
0864c7a9 DB |
1082 | dev->state = STATE_DEV_SETUP; |
1083 | n = i + 1; | |
1da177e4 LT |
1084 | break; |
1085 | } | |
1086 | } | |
1087 | spin_unlock_irq (&dev->lock); | |
0864c7a9 | 1088 | len = n * sizeof (struct usb_gadgetfs_event); |
1da177e4 LT |
1089 | if (copy_to_user (buf, &dev->event, len)) |
1090 | retval = -EFAULT; | |
1091 | else | |
1092 | retval = len; | |
1093 | if (len > 0) { | |
1da177e4 LT |
1094 | /* NOTE this doesn't guard against broken drivers; |
1095 | * concurrent ep0 readers may lose events. | |
1096 | */ | |
1097 | spin_lock_irq (&dev->lock); | |
0864c7a9 DB |
1098 | if (dev->ev_next > n) { |
1099 | memmove(&dev->event[0], &dev->event[n], | |
1da177e4 | 1100 | sizeof (struct usb_gadgetfs_event) |
0864c7a9 DB |
1101 | * (dev->ev_next - n)); |
1102 | } | |
1103 | dev->ev_next -= n; | |
1da177e4 LT |
1104 | spin_unlock_irq (&dev->lock); |
1105 | } | |
1106 | return retval; | |
1107 | } | |
1108 | if (fd->f_flags & O_NONBLOCK) { | |
1109 | retval = -EAGAIN; | |
1110 | goto done; | |
1111 | } | |
1112 | ||
1113 | switch (state) { | |
1114 | default: | |
441b62c1 | 1115 | DBG (dev, "fail %s, state %d\n", __func__, state); |
1da177e4 LT |
1116 | retval = -ESRCH; |
1117 | break; | |
7489d149 DB |
1118 | case STATE_DEV_UNCONNECTED: |
1119 | case STATE_DEV_CONNECTED: | |
1da177e4 | 1120 | spin_unlock_irq (&dev->lock); |
441b62c1 | 1121 | DBG (dev, "%s wait\n", __func__); |
1da177e4 LT |
1122 | |
1123 | /* wait for events */ | |
1124 | retval = wait_event_interruptible (dev->wait, | |
1125 | dev->ev_next != 0); | |
1126 | if (retval < 0) | |
1127 | return retval; | |
1128 | spin_lock_irq (&dev->lock); | |
1129 | goto scan; | |
1130 | } | |
1131 | ||
1132 | done: | |
1133 | spin_unlock_irq (&dev->lock); | |
1134 | return retval; | |
1135 | } | |
1136 | ||
1137 | static struct usb_gadgetfs_event * | |
1138 | next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type) | |
1139 | { | |
1140 | struct usb_gadgetfs_event *event; | |
1141 | unsigned i; | |
1142 | ||
1143 | switch (type) { | |
1144 | /* these events purge the queue */ | |
1145 | case GADGETFS_DISCONNECT: | |
7489d149 | 1146 | if (dev->state == STATE_DEV_SETUP) |
1da177e4 LT |
1147 | dev->setup_abort = 1; |
1148 | // FALL THROUGH | |
1149 | case GADGETFS_CONNECT: | |
1150 | dev->ev_next = 0; | |
1151 | break; | |
1152 | case GADGETFS_SETUP: /* previous request timed out */ | |
1153 | case GADGETFS_SUSPEND: /* same effect */ | |
1154 | /* these events can't be repeated */ | |
1155 | for (i = 0; i != dev->ev_next; i++) { | |
1156 | if (dev->event [i].type != type) | |
1157 | continue; | |
0864c7a9 | 1158 | DBG(dev, "discard old event[%d] %d\n", i, type); |
1da177e4 LT |
1159 | dev->ev_next--; |
1160 | if (i == dev->ev_next) | |
1161 | break; | |
1162 | /* indices start at zero, for simplicity */ | |
1163 | memmove (&dev->event [i], &dev->event [i + 1], | |
1164 | sizeof (struct usb_gadgetfs_event) | |
1165 | * (dev->ev_next - i)); | |
1166 | } | |
1167 | break; | |
1168 | default: | |
1169 | BUG (); | |
1170 | } | |
0864c7a9 | 1171 | VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type); |
1da177e4 LT |
1172 | event = &dev->event [dev->ev_next++]; |
1173 | BUG_ON (dev->ev_next > N_EVENT); | |
1da177e4 LT |
1174 | memset (event, 0, sizeof *event); |
1175 | event->type = type; | |
1176 | return event; | |
1177 | } | |
1178 | ||
1179 | static ssize_t | |
1180 | ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) | |
1181 | { | |
1182 | struct dev_data *dev = fd->private_data; | |
1183 | ssize_t retval = -ESRCH; | |
1184 | ||
1185 | spin_lock_irq (&dev->lock); | |
1186 | ||
1187 | /* report fd mode change before acting on it */ | |
1188 | if (dev->setup_abort) { | |
1189 | dev->setup_abort = 0; | |
1190 | retval = -EIDRM; | |
1191 | ||
1192 | /* data and/or status stage for control request */ | |
7489d149 | 1193 | } else if (dev->state == STATE_DEV_SETUP) { |
1da177e4 LT |
1194 | |
1195 | /* IN DATA+STATUS caller makes len <= wLength */ | |
1196 | if (dev->setup_in) { | |
1197 | retval = setup_req (dev->gadget->ep0, dev->req, len); | |
1198 | if (retval == 0) { | |
5b89db02 | 1199 | dev->state = STATE_DEV_CONNECTED; |
1da177e4 LT |
1200 | spin_unlock_irq (&dev->lock); |
1201 | if (copy_from_user (dev->req->buf, buf, len)) | |
1202 | retval = -EFAULT; | |
97906369 AS |
1203 | else { |
1204 | if (len < dev->setup_wLength) | |
1205 | dev->req->zero = 1; | |
1da177e4 LT |
1206 | retval = usb_ep_queue ( |
1207 | dev->gadget->ep0, dev->req, | |
1208 | GFP_KERNEL); | |
97906369 | 1209 | } |
1da177e4 LT |
1210 | if (retval < 0) { |
1211 | spin_lock_irq (&dev->lock); | |
1212 | clean_req (dev->gadget->ep0, dev->req); | |
1213 | spin_unlock_irq (&dev->lock); | |
1214 | } else | |
1215 | retval = len; | |
1216 | ||
1217 | return retval; | |
1218 | } | |
1219 | ||
1220 | /* can stall some OUT transfers */ | |
1221 | } else if (dev->setup_can_stall) { | |
1222 | VDEBUG(dev, "ep0out stall\n"); | |
1223 | (void) usb_ep_set_halt (dev->gadget->ep0); | |
1224 | retval = -EL2HLT; | |
7489d149 | 1225 | dev->state = STATE_DEV_CONNECTED; |
1da177e4 LT |
1226 | } else { |
1227 | DBG(dev, "bogus ep0out stall!\n"); | |
1228 | } | |
1229 | } else | |
441b62c1 | 1230 | DBG (dev, "fail %s, state %d\n", __func__, dev->state); |
1da177e4 LT |
1231 | |
1232 | spin_unlock_irq (&dev->lock); | |
1233 | return retval; | |
1234 | } | |
1235 | ||
1236 | static int | |
1237 | ep0_fasync (int f, struct file *fd, int on) | |
1238 | { | |
1239 | struct dev_data *dev = fd->private_data; | |
1240 | // caller must F_SETOWN before signal delivery happens | |
441b62c1 | 1241 | VDEBUG (dev, "%s %s\n", __func__, on ? "on" : "off"); |
1da177e4 LT |
1242 | return fasync_helper (f, fd, on, &dev->fasync); |
1243 | } | |
1244 | ||
1245 | static struct usb_gadget_driver gadgetfs_driver; | |
1246 | ||
1247 | static int | |
1248 | dev_release (struct inode *inode, struct file *fd) | |
1249 | { | |
1250 | struct dev_data *dev = fd->private_data; | |
1251 | ||
1252 | /* closing ep0 === shutdown all */ | |
1253 | ||
1254 | usb_gadget_unregister_driver (&gadgetfs_driver); | |
1255 | ||
1256 | /* at this point "good" hardware has disconnected the | |
1257 | * device from USB; the host won't see it any more. | |
1258 | * alternatively, all host requests will time out. | |
1259 | */ | |
1260 | ||
1da177e4 LT |
1261 | kfree (dev->buf); |
1262 | dev->buf = NULL; | |
1263 | put_dev (dev); | |
1264 | ||
1265 | /* other endpoints were all decoupled from this device */ | |
7489d149 | 1266 | spin_lock_irq(&dev->lock); |
1da177e4 | 1267 | dev->state = STATE_DEV_DISABLED; |
7489d149 | 1268 | spin_unlock_irq(&dev->lock); |
1da177e4 LT |
1269 | return 0; |
1270 | } | |
1271 | ||
e22fc27c MS |
1272 | static unsigned int |
1273 | ep0_poll (struct file *fd, poll_table *wait) | |
1274 | { | |
1275 | struct dev_data *dev = fd->private_data; | |
1276 | int mask = 0; | |
1277 | ||
1278 | poll_wait(fd, &dev->wait, wait); | |
1279 | ||
1280 | spin_lock_irq (&dev->lock); | |
1281 | ||
1282 | /* report fd mode change before acting on it */ | |
1283 | if (dev->setup_abort) { | |
1284 | dev->setup_abort = 0; | |
1285 | mask = POLLHUP; | |
1286 | goto out; | |
1287 | } | |
1288 | ||
7489d149 | 1289 | if (dev->state == STATE_DEV_SETUP) { |
e22fc27c MS |
1290 | if (dev->setup_in || dev->setup_can_stall) |
1291 | mask = POLLOUT; | |
1292 | } else { | |
1293 | if (dev->ev_next != 0) | |
1294 | mask = POLLIN; | |
1295 | } | |
1296 | out: | |
1297 | spin_unlock_irq(&dev->lock); | |
1298 | return mask; | |
1299 | } | |
1300 | ||
44c389a0 | 1301 | static long dev_ioctl (struct file *fd, unsigned code, unsigned long value) |
1da177e4 LT |
1302 | { |
1303 | struct dev_data *dev = fd->private_data; | |
1304 | struct usb_gadget *gadget = dev->gadget; | |
44c389a0 | 1305 | long ret = -ENOTTY; |
1da177e4 | 1306 | |
1548b13b | 1307 | if (gadget->ops->ioctl) |
44c389a0 | 1308 | ret = gadget->ops->ioctl (gadget, code, value); |
1548b13b | 1309 | |
44c389a0 | 1310 | return ret; |
1da177e4 LT |
1311 | } |
1312 | ||
1313 | /* used after device configuration */ | |
066202dd | 1314 | static const struct file_operations ep0_io_operations = { |
1da177e4 LT |
1315 | .owner = THIS_MODULE, |
1316 | .llseek = no_llseek, | |
1317 | ||
1318 | .read = ep0_read, | |
1319 | .write = ep0_write, | |
1320 | .fasync = ep0_fasync, | |
e22fc27c | 1321 | .poll = ep0_poll, |
44c389a0 | 1322 | .unlocked_ioctl = dev_ioctl, |
1da177e4 LT |
1323 | .release = dev_release, |
1324 | }; | |
1325 | ||
1326 | /*----------------------------------------------------------------------*/ | |
1327 | ||
1328 | /* The in-kernel gadget driver handles most ep0 issues, in particular | |
1329 | * enumerating the single configuration (as provided from user space). | |
1330 | * | |
1331 | * Unrecognized ep0 requests may be handled in user space. | |
1332 | */ | |
1333 | ||
98416333 | 1334 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
1335 | static void make_qualifier (struct dev_data *dev) |
1336 | { | |
1337 | struct usb_qualifier_descriptor qual; | |
1338 | struct usb_device_descriptor *desc; | |
1339 | ||
1340 | qual.bLength = sizeof qual; | |
1341 | qual.bDescriptorType = USB_DT_DEVICE_QUALIFIER; | |
551509d2 | 1342 | qual.bcdUSB = cpu_to_le16 (0x0200); |
1da177e4 LT |
1343 | |
1344 | desc = dev->dev; | |
1345 | qual.bDeviceClass = desc->bDeviceClass; | |
1346 | qual.bDeviceSubClass = desc->bDeviceSubClass; | |
1347 | qual.bDeviceProtocol = desc->bDeviceProtocol; | |
1348 | ||
1349 | /* assumes ep0 uses the same value for both speeds ... */ | |
1350 | qual.bMaxPacketSize0 = desc->bMaxPacketSize0; | |
1351 | ||
1352 | qual.bNumConfigurations = 1; | |
1353 | qual.bRESERVED = 0; | |
1354 | ||
1355 | memcpy (dev->rbuf, &qual, sizeof qual); | |
1356 | } | |
1357 | #endif | |
1358 | ||
1359 | static int | |
1360 | config_buf (struct dev_data *dev, u8 type, unsigned index) | |
1361 | { | |
1362 | int len; | |
a4e3ef55 | 1363 | int hs = 0; |
1da177e4 LT |
1364 | |
1365 | /* only one configuration */ | |
1366 | if (index > 0) | |
1367 | return -EINVAL; | |
1368 | ||
a4e3ef55 DB |
1369 | if (gadget_is_dualspeed(dev->gadget)) { |
1370 | hs = (dev->gadget->speed == USB_SPEED_HIGH); | |
1371 | if (type == USB_DT_OTHER_SPEED_CONFIG) | |
1372 | hs = !hs; | |
1373 | } | |
1da177e4 LT |
1374 | if (hs) { |
1375 | dev->req->buf = dev->hs_config; | |
01ee7d70 | 1376 | len = le16_to_cpu(dev->hs_config->wTotalLength); |
a4e3ef55 | 1377 | } else { |
1da177e4 | 1378 | dev->req->buf = dev->config; |
01ee7d70 | 1379 | len = le16_to_cpu(dev->config->wTotalLength); |
1da177e4 LT |
1380 | } |
1381 | ((u8 *)dev->req->buf) [1] = type; | |
1382 | return len; | |
1383 | } | |
1384 | ||
1385 | static int | |
1386 | gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) | |
1387 | { | |
1388 | struct dev_data *dev = get_gadget_data (gadget); | |
1389 | struct usb_request *req = dev->req; | |
1390 | int value = -EOPNOTSUPP; | |
1391 | struct usb_gadgetfs_event *event; | |
1bbc1696 DB |
1392 | u16 w_value = le16_to_cpu(ctrl->wValue); |
1393 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
1da177e4 LT |
1394 | |
1395 | spin_lock (&dev->lock); | |
1396 | dev->setup_abort = 0; | |
7489d149 | 1397 | if (dev->state == STATE_DEV_UNCONNECTED) { |
a4e3ef55 DB |
1398 | if (gadget_is_dualspeed(gadget) |
1399 | && gadget->speed == USB_SPEED_HIGH | |
1400 | && dev->hs_config == NULL) { | |
ce46794f | 1401 | spin_unlock(&dev->lock); |
1da177e4 LT |
1402 | ERROR (dev, "no high speed config??\n"); |
1403 | return -EINVAL; | |
1404 | } | |
1da177e4 | 1405 | |
ce46794f DB |
1406 | dev->state = STATE_DEV_CONNECTED; |
1407 | dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket; | |
1408 | ||
1da177e4 LT |
1409 | INFO (dev, "connected\n"); |
1410 | event = next_event (dev, GADGETFS_CONNECT); | |
1411 | event->u.speed = gadget->speed; | |
1412 | ep0_readable (dev); | |
1413 | ||
1da177e4 LT |
1414 | /* host may have given up waiting for response. we can miss control |
1415 | * requests handled lower down (device/endpoint status and features); | |
1416 | * then ep0_{read,write} will report the wrong status. controller | |
1417 | * driver will have aborted pending i/o. | |
1418 | */ | |
7489d149 | 1419 | } else if (dev->state == STATE_DEV_SETUP) |
1da177e4 LT |
1420 | dev->setup_abort = 1; |
1421 | ||
1422 | req->buf = dev->rbuf; | |
1423 | req->dma = DMA_ADDR_INVALID; | |
1424 | req->context = NULL; | |
1425 | value = -EOPNOTSUPP; | |
1426 | switch (ctrl->bRequest) { | |
1427 | ||
1428 | case USB_REQ_GET_DESCRIPTOR: | |
1429 | if (ctrl->bRequestType != USB_DIR_IN) | |
1430 | goto unrecognized; | |
1431 | switch (w_value >> 8) { | |
1432 | ||
1433 | case USB_DT_DEVICE: | |
1434 | value = min (w_length, (u16) sizeof *dev->dev); | |
1435 | req->buf = dev->dev; | |
1436 | break; | |
98416333 | 1437 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
1438 | case USB_DT_DEVICE_QUALIFIER: |
1439 | if (!dev->hs_config) | |
1440 | break; | |
1441 | value = min (w_length, (u16) | |
1442 | sizeof (struct usb_qualifier_descriptor)); | |
1443 | make_qualifier (dev); | |
1444 | break; | |
1445 | case USB_DT_OTHER_SPEED_CONFIG: | |
1446 | // FALLTHROUGH | |
1447 | #endif | |
1448 | case USB_DT_CONFIG: | |
1449 | value = config_buf (dev, | |
1450 | w_value >> 8, | |
1451 | w_value & 0xff); | |
1452 | if (value >= 0) | |
1453 | value = min (w_length, (u16) value); | |
1454 | break; | |
1455 | case USB_DT_STRING: | |
1456 | goto unrecognized; | |
1457 | ||
1458 | default: // all others are errors | |
1459 | break; | |
1460 | } | |
1461 | break; | |
1462 | ||
1463 | /* currently one config, two speeds */ | |
1464 | case USB_REQ_SET_CONFIGURATION: | |
1465 | if (ctrl->bRequestType != 0) | |
12cd5b98 | 1466 | goto unrecognized; |
1da177e4 LT |
1467 | if (0 == (u8) w_value) { |
1468 | value = 0; | |
1469 | dev->current_config = 0; | |
1470 | usb_gadget_vbus_draw(gadget, 8 /* mA */ ); | |
1471 | // user mode expected to disable endpoints | |
1472 | } else { | |
1473 | u8 config, power; | |
a4e3ef55 DB |
1474 | |
1475 | if (gadget_is_dualspeed(gadget) | |
1476 | && gadget->speed == USB_SPEED_HIGH) { | |
1da177e4 LT |
1477 | config = dev->hs_config->bConfigurationValue; |
1478 | power = dev->hs_config->bMaxPower; | |
a4e3ef55 | 1479 | } else { |
1da177e4 LT |
1480 | config = dev->config->bConfigurationValue; |
1481 | power = dev->config->bMaxPower; | |
1482 | } | |
1483 | ||
1484 | if (config == (u8) w_value) { | |
1485 | value = 0; | |
1486 | dev->current_config = config; | |
1487 | usb_gadget_vbus_draw(gadget, 2 * power); | |
1488 | } | |
1489 | } | |
1490 | ||
1491 | /* report SET_CONFIGURATION like any other control request, | |
1492 | * except that usermode may not stall this. the next | |
1493 | * request mustn't be allowed start until this finishes: | |
1494 | * endpoints and threads set up, etc. | |
1495 | * | |
1496 | * NOTE: older PXA hardware (before PXA 255: without UDCCFR) | |
1497 | * has bad/racey automagic that prevents synchronizing here. | |
1498 | * even kernel mode drivers often miss them. | |
1499 | */ | |
1500 | if (value == 0) { | |
1501 | INFO (dev, "configuration #%d\n", dev->current_config); | |
1502 | if (dev->usermode_setup) { | |
1503 | dev->setup_can_stall = 0; | |
1504 | goto delegate; | |
1505 | } | |
1506 | } | |
1507 | break; | |
1508 | ||
7a857620 | 1509 | #ifndef CONFIG_USB_GADGET_PXA25X |
1da177e4 LT |
1510 | /* PXA automagically handles this request too */ |
1511 | case USB_REQ_GET_CONFIGURATION: | |
1512 | if (ctrl->bRequestType != 0x80) | |
12cd5b98 | 1513 | goto unrecognized; |
1da177e4 LT |
1514 | *(u8 *)req->buf = dev->current_config; |
1515 | value = min (w_length, (u16) 1); | |
1516 | break; | |
1517 | #endif | |
1518 | ||
1519 | default: | |
1520 | unrecognized: | |
1521 | VDEBUG (dev, "%s req%02x.%02x v%04x i%04x l%d\n", | |
1522 | dev->usermode_setup ? "delegate" : "fail", | |
1523 | ctrl->bRequestType, ctrl->bRequest, | |
1524 | w_value, le16_to_cpu(ctrl->wIndex), w_length); | |
1525 | ||
1526 | /* if there's an ep0 reader, don't stall */ | |
1527 | if (dev->usermode_setup) { | |
1528 | dev->setup_can_stall = 1; | |
1529 | delegate: | |
1530 | dev->setup_in = (ctrl->bRequestType & USB_DIR_IN) | |
1531 | ? 1 : 0; | |
97906369 | 1532 | dev->setup_wLength = w_length; |
1da177e4 LT |
1533 | dev->setup_out_ready = 0; |
1534 | dev->setup_out_error = 0; | |
1535 | value = 0; | |
1536 | ||
1537 | /* read DATA stage for OUT right away */ | |
1538 | if (unlikely (!dev->setup_in && w_length)) { | |
1539 | value = setup_req (gadget->ep0, dev->req, | |
1540 | w_length); | |
1541 | if (value < 0) | |
1542 | break; | |
1543 | value = usb_ep_queue (gadget->ep0, dev->req, | |
1544 | GFP_ATOMIC); | |
1545 | if (value < 0) { | |
1546 | clean_req (gadget->ep0, dev->req); | |
1547 | break; | |
1548 | } | |
1549 | ||
1550 | /* we can't currently stall these */ | |
1551 | dev->setup_can_stall = 0; | |
1552 | } | |
1553 | ||
1554 | /* state changes when reader collects event */ | |
1555 | event = next_event (dev, GADGETFS_SETUP); | |
1556 | event->u.setup = *ctrl; | |
1557 | ep0_readable (dev); | |
1558 | spin_unlock (&dev->lock); | |
1559 | return 0; | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | /* proceed with data transfer and status phases? */ | |
7489d149 | 1564 | if (value >= 0 && dev->state != STATE_DEV_SETUP) { |
1da177e4 LT |
1565 | req->length = value; |
1566 | req->zero = value < w_length; | |
1567 | value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC); | |
1568 | if (value < 0) { | |
1569 | DBG (dev, "ep_queue --> %d\n", value); | |
1570 | req->status = 0; | |
1571 | } | |
1572 | } | |
1573 | ||
1574 | /* device stalls when value < 0 */ | |
1575 | spin_unlock (&dev->lock); | |
1576 | return value; | |
1577 | } | |
1578 | ||
1579 | static void destroy_ep_files (struct dev_data *dev) | |
1580 | { | |
1581 | struct list_head *entry, *tmp; | |
1582 | ||
441b62c1 | 1583 | DBG (dev, "%s %d\n", __func__, dev->state); |
1da177e4 LT |
1584 | |
1585 | /* dev->state must prevent interference */ | |
1586 | restart: | |
1587 | spin_lock_irq (&dev->lock); | |
1588 | list_for_each_safe (entry, tmp, &dev->epfiles) { | |
1589 | struct ep_data *ep; | |
1590 | struct inode *parent; | |
1591 | struct dentry *dentry; | |
1592 | ||
1593 | /* break link to FS */ | |
1594 | ep = list_entry (entry, struct ep_data, epfiles); | |
1595 | list_del_init (&ep->epfiles); | |
1596 | dentry = ep->dentry; | |
1597 | ep->dentry = NULL; | |
1598 | parent = dentry->d_parent->d_inode; | |
1599 | ||
1600 | /* break link to controller */ | |
1601 | if (ep->state == STATE_EP_ENABLED) | |
1602 | (void) usb_ep_disable (ep->ep); | |
1603 | ep->state = STATE_EP_UNBOUND; | |
1604 | usb_ep_free_request (ep->ep, ep->req); | |
1605 | ep->ep = NULL; | |
1606 | wake_up (&ep->wait); | |
1607 | put_ep (ep); | |
1608 | ||
1609 | spin_unlock_irq (&dev->lock); | |
1610 | ||
1611 | /* break link to dcache */ | |
1b1dcc1b | 1612 | mutex_lock (&parent->i_mutex); |
1da177e4 LT |
1613 | d_delete (dentry); |
1614 | dput (dentry); | |
1b1dcc1b | 1615 | mutex_unlock (&parent->i_mutex); |
1da177e4 LT |
1616 | |
1617 | /* fds may still be open */ | |
1618 | goto restart; | |
1619 | } | |
1620 | spin_unlock_irq (&dev->lock); | |
1621 | } | |
1622 | ||
1623 | ||
1624 | static struct inode * | |
1625 | gadgetfs_create_file (struct super_block *sb, char const *name, | |
99ac48f5 | 1626 | void *data, const struct file_operations *fops, |
1da177e4 LT |
1627 | struct dentry **dentry_p); |
1628 | ||
1629 | static int activate_ep_files (struct dev_data *dev) | |
1630 | { | |
1631 | struct usb_ep *ep; | |
0ae4ea80 | 1632 | struct ep_data *data; |
1da177e4 LT |
1633 | |
1634 | gadget_for_each_ep (ep, dev->gadget) { | |
1da177e4 | 1635 | |
7039f422 | 1636 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 | 1637 | if (!data) |
0ae4ea80 | 1638 | goto enomem0; |
1da177e4 | 1639 | data->state = STATE_EP_DISABLED; |
a79df50b | 1640 | mutex_init(&data->lock); |
1da177e4 LT |
1641 | init_waitqueue_head (&data->wait); |
1642 | ||
1643 | strncpy (data->name, ep->name, sizeof (data->name) - 1); | |
1644 | atomic_set (&data->count, 1); | |
1645 | data->dev = dev; | |
1646 | get_dev (dev); | |
1647 | ||
1648 | data->ep = ep; | |
1649 | ep->driver_data = data; | |
1650 | ||
1651 | data->req = usb_ep_alloc_request (ep, GFP_KERNEL); | |
1652 | if (!data->req) | |
0ae4ea80 | 1653 | goto enomem1; |
1da177e4 LT |
1654 | |
1655 | data->inode = gadgetfs_create_file (dev->sb, data->name, | |
1656 | data, &ep_config_operations, | |
1657 | &data->dentry); | |
0ae4ea80 AS |
1658 | if (!data->inode) |
1659 | goto enomem2; | |
1da177e4 LT |
1660 | list_add_tail (&data->epfiles, &dev->epfiles); |
1661 | } | |
1662 | return 0; | |
1663 | ||
0ae4ea80 AS |
1664 | enomem2: |
1665 | usb_ep_free_request (ep, data->req); | |
1666 | enomem1: | |
1667 | put_dev (dev); | |
1668 | kfree (data); | |
1669 | enomem0: | |
441b62c1 | 1670 | DBG (dev, "%s enomem\n", __func__); |
1da177e4 LT |
1671 | destroy_ep_files (dev); |
1672 | return -ENOMEM; | |
1673 | } | |
1674 | ||
1675 | static void | |
1676 | gadgetfs_unbind (struct usb_gadget *gadget) | |
1677 | { | |
1678 | struct dev_data *dev = get_gadget_data (gadget); | |
1679 | ||
441b62c1 | 1680 | DBG (dev, "%s\n", __func__); |
1da177e4 LT |
1681 | |
1682 | spin_lock_irq (&dev->lock); | |
1683 | dev->state = STATE_DEV_UNBOUND; | |
1684 | spin_unlock_irq (&dev->lock); | |
1685 | ||
1686 | destroy_ep_files (dev); | |
1687 | gadget->ep0->driver_data = NULL; | |
1688 | set_gadget_data (gadget, NULL); | |
1689 | ||
1690 | /* we've already been disconnected ... no i/o is active */ | |
1691 | if (dev->req) | |
1692 | usb_ep_free_request (gadget->ep0, dev->req); | |
441b62c1 | 1693 | DBG (dev, "%s done\n", __func__); |
1da177e4 LT |
1694 | put_dev (dev); |
1695 | } | |
1696 | ||
1697 | static struct dev_data *the_device; | |
1698 | ||
1699 | static int | |
1700 | gadgetfs_bind (struct usb_gadget *gadget) | |
1701 | { | |
1702 | struct dev_data *dev = the_device; | |
1703 | ||
1704 | if (!dev) | |
1705 | return -ESRCH; | |
1706 | if (0 != strcmp (CHIP, gadget->name)) { | |
00274921 | 1707 | pr_err("%s expected %s controller not %s\n", |
1da177e4 LT |
1708 | shortname, CHIP, gadget->name); |
1709 | return -ENODEV; | |
1710 | } | |
1711 | ||
1712 | set_gadget_data (gadget, dev); | |
1713 | dev->gadget = gadget; | |
1714 | gadget->ep0->driver_data = dev; | |
1715 | dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket; | |
1716 | ||
1717 | /* preallocate control response and buffer */ | |
1718 | dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL); | |
1719 | if (!dev->req) | |
1720 | goto enomem; | |
1721 | dev->req->context = NULL; | |
1722 | dev->req->complete = epio_complete; | |
1723 | ||
1724 | if (activate_ep_files (dev) < 0) | |
1725 | goto enomem; | |
1726 | ||
1727 | INFO (dev, "bound to %s driver\n", gadget->name); | |
7489d149 DB |
1728 | spin_lock_irq(&dev->lock); |
1729 | dev->state = STATE_DEV_UNCONNECTED; | |
1730 | spin_unlock_irq(&dev->lock); | |
1da177e4 LT |
1731 | get_dev (dev); |
1732 | return 0; | |
1733 | ||
1734 | enomem: | |
1735 | gadgetfs_unbind (gadget); | |
1736 | return -ENOMEM; | |
1737 | } | |
1738 | ||
1739 | static void | |
1740 | gadgetfs_disconnect (struct usb_gadget *gadget) | |
1741 | { | |
1742 | struct dev_data *dev = get_gadget_data (gadget); | |
1743 | ||
07cb7f23 | 1744 | spin_lock (&dev->lock); |
7489d149 | 1745 | if (dev->state == STATE_DEV_UNCONNECTED) |
07cb7f23 | 1746 | goto exit; |
7489d149 | 1747 | dev->state = STATE_DEV_UNCONNECTED; |
1da177e4 LT |
1748 | |
1749 | INFO (dev, "disconnected\n"); | |
1da177e4 LT |
1750 | next_event (dev, GADGETFS_DISCONNECT); |
1751 | ep0_readable (dev); | |
07cb7f23 | 1752 | exit: |
1da177e4 LT |
1753 | spin_unlock (&dev->lock); |
1754 | } | |
1755 | ||
1756 | static void | |
1757 | gadgetfs_suspend (struct usb_gadget *gadget) | |
1758 | { | |
1759 | struct dev_data *dev = get_gadget_data (gadget); | |
1760 | ||
1761 | INFO (dev, "suspended from state %d\n", dev->state); | |
1762 | spin_lock (&dev->lock); | |
1763 | switch (dev->state) { | |
7489d149 DB |
1764 | case STATE_DEV_SETUP: // VERY odd... host died?? |
1765 | case STATE_DEV_CONNECTED: | |
1766 | case STATE_DEV_UNCONNECTED: | |
1da177e4 LT |
1767 | next_event (dev, GADGETFS_SUSPEND); |
1768 | ep0_readable (dev); | |
1769 | /* FALLTHROUGH */ | |
1770 | default: | |
1771 | break; | |
1772 | } | |
1773 | spin_unlock (&dev->lock); | |
1774 | } | |
1775 | ||
1776 | static struct usb_gadget_driver gadgetfs_driver = { | |
98416333 | 1777 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
1778 | .speed = USB_SPEED_HIGH, |
1779 | #else | |
1780 | .speed = USB_SPEED_FULL, | |
1781 | #endif | |
1782 | .function = (char *) driver_desc, | |
1da177e4 LT |
1783 | .unbind = gadgetfs_unbind, |
1784 | .setup = gadgetfs_setup, | |
1785 | .disconnect = gadgetfs_disconnect, | |
1786 | .suspend = gadgetfs_suspend, | |
1787 | ||
2505107d | 1788 | .driver = { |
1da177e4 | 1789 | .name = (char *) shortname, |
1da177e4 LT |
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, | |
1da177e4 LT |
1805 | .unbind = gadgetfs_nop, |
1806 | .setup = (void *)gadgetfs_nop, | |
1807 | .disconnect = gadgetfs_nop, | |
2505107d | 1808 | .driver = { |
1da177e4 LT |
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; | |
2505107d | 1828 | * this one's optional except for high-speed hardware |
1da177e4 LT |
1829 | * . device descriptor |
1830 | * | |
511779fd PE |
1831 | * Endpoints are not yet enabled. Drivers must wait until device |
1832 | * configuration and interface altsetting changes create | |
1da177e4 LT |
1833 | * the need to configure (or unconfigure) them. |
1834 | * | |
1835 | * After initialization, the device stays active for as long as that | |
511779fd PE |
1836 | * $CHIP file is open. Events must then be read from that descriptor, |
1837 | * such as configuration notifications. | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
be8a058b JL |
1871 | kbuf = memdup_user(buf, length); |
1872 | if (IS_ERR(kbuf)) | |
1873 | return PTR_ERR(kbuf); | |
1da177e4 LT |
1874 | |
1875 | spin_lock_irq (&dev->lock); | |
1876 | value = -EINVAL; | |
1877 | if (dev->buf) | |
1878 | goto fail; | |
1879 | dev->buf = kbuf; | |
1880 | ||
1881 | /* full or low speed config */ | |
1882 | dev->config = (void *) kbuf; | |
01ee7d70 | 1883 | total = le16_to_cpu(dev->config->wTotalLength); |
1da177e4 LT |
1884 | if (!is_valid_config (dev->config) || total >= length) |
1885 | goto fail; | |
1886 | kbuf += total; | |
1887 | length -= total; | |
1888 | ||
1889 | /* optional high speed config */ | |
1890 | if (kbuf [1] == USB_DT_CONFIG) { | |
1891 | dev->hs_config = (void *) kbuf; | |
01ee7d70 | 1892 | total = le16_to_cpu(dev->hs_config->wTotalLength); |
1da177e4 LT |
1893 | if (!is_valid_config (dev->hs_config) || total >= length) |
1894 | goto fail; | |
1895 | kbuf += total; | |
1896 | length -= total; | |
1897 | } | |
1898 | ||
1899 | /* could support multiple configs, using another encoding! */ | |
1900 | ||
1901 | /* device descriptor (tweaked for paranoia) */ | |
1902 | if (length != USB_DT_DEVICE_SIZE) | |
1903 | goto fail; | |
1904 | dev->dev = (void *)kbuf; | |
1905 | if (dev->dev->bLength != USB_DT_DEVICE_SIZE | |
1906 | || dev->dev->bDescriptorType != USB_DT_DEVICE | |
1907 | || dev->dev->bNumConfigurations != 1) | |
1908 | goto fail; | |
1909 | dev->dev->bNumConfigurations = 1; | |
551509d2 | 1910 | dev->dev->bcdUSB = cpu_to_le16 (0x0200); |
1da177e4 LT |
1911 | |
1912 | /* triggers gadgetfs_bind(); then we can enumerate. */ | |
1913 | spin_unlock_irq (&dev->lock); | |
b0fca50f | 1914 | value = usb_gadget_probe_driver(&gadgetfs_driver, gadgetfs_bind); |
1da177e4 LT |
1915 | if (value != 0) { |
1916 | kfree (dev->buf); | |
1917 | dev->buf = NULL; | |
1918 | } else { | |
1919 | /* at this point "good" hardware has for the first time | |
1920 | * let the USB the host see us. alternatively, if users | |
1921 | * unplug/replug that will clear all the error state. | |
1922 | * | |
1923 | * note: everything running before here was guaranteed | |
1924 | * to choke driver model style diagnostics. from here | |
1925 | * on, they can work ... except in cleanup paths that | |
1926 | * kick in after the ep0 descriptor is closed. | |
1927 | */ | |
1928 | fd->f_op = &ep0_io_operations; | |
1929 | value = len; | |
1930 | } | |
1931 | return value; | |
1932 | ||
1933 | fail: | |
1934 | spin_unlock_irq (&dev->lock); | |
441b62c1 | 1935 | pr_debug ("%s: %s fail %Zd, %p\n", shortname, __func__, value, dev); |
1da177e4 LT |
1936 | kfree (dev->buf); |
1937 | dev->buf = NULL; | |
1938 | return value; | |
1939 | } | |
1940 | ||
1941 | static int | |
1942 | dev_open (struct inode *inode, struct file *fd) | |
1943 | { | |
8e18e294 | 1944 | struct dev_data *dev = inode->i_private; |
1da177e4 LT |
1945 | int value = -EBUSY; |
1946 | ||
7489d149 | 1947 | spin_lock_irq(&dev->lock); |
1da177e4 LT |
1948 | if (dev->state == STATE_DEV_DISABLED) { |
1949 | dev->ev_next = 0; | |
7489d149 | 1950 | dev->state = STATE_DEV_OPENED; |
1da177e4 LT |
1951 | fd->private_data = dev; |
1952 | get_dev (dev); | |
1953 | value = 0; | |
1954 | } | |
7489d149 | 1955 | spin_unlock_irq(&dev->lock); |
1da177e4 LT |
1956 | return value; |
1957 | } | |
1958 | ||
066202dd | 1959 | static const struct file_operations dev_init_operations = { |
1da177e4 LT |
1960 | .owner = THIS_MODULE, |
1961 | .llseek = no_llseek, | |
1962 | ||
1963 | .open = dev_open, | |
1964 | .write = dev_config, | |
1965 | .fasync = ep0_fasync, | |
44c389a0 | 1966 | .unlocked_ioctl = dev_ioctl, |
1da177e4 LT |
1967 | .release = dev_release, |
1968 | }; | |
1969 | ||
1970 | /*----------------------------------------------------------------------*/ | |
1971 | ||
1972 | /* FILESYSTEM AND SUPERBLOCK OPERATIONS | |
1973 | * | |
1974 | * Mounting the filesystem creates a controller file, used first for | |
1975 | * device configuration then later for event monitoring. | |
1976 | */ | |
1977 | ||
1978 | ||
1979 | /* FIXME PAM etc could set this security policy without mount options | |
1980 | * if epfiles inherited ownership and permissons from ep0 ... | |
1981 | */ | |
1982 | ||
1983 | static unsigned default_uid; | |
1984 | static unsigned default_gid; | |
1985 | static unsigned default_perm = S_IRUSR | S_IWUSR; | |
1986 | ||
1987 | module_param (default_uid, uint, 0644); | |
1988 | module_param (default_gid, uint, 0644); | |
1989 | module_param (default_perm, uint, 0644); | |
1990 | ||
1991 | ||
1992 | static struct inode * | |
1993 | gadgetfs_make_inode (struct super_block *sb, | |
99ac48f5 | 1994 | void *data, const struct file_operations *fops, |
1da177e4 LT |
1995 | int mode) |
1996 | { | |
1997 | struct inode *inode = new_inode (sb); | |
1998 | ||
1999 | if (inode) { | |
85fe4025 | 2000 | inode->i_ino = get_next_ino(); |
1da177e4 LT |
2001 | inode->i_mode = mode; |
2002 | inode->i_uid = default_uid; | |
2003 | inode->i_gid = default_gid; | |
1da177e4 LT |
2004 | inode->i_atime = inode->i_mtime = inode->i_ctime |
2005 | = CURRENT_TIME; | |
8e18e294 | 2006 | inode->i_private = data; |
1da177e4 LT |
2007 | inode->i_fop = fops; |
2008 | } | |
2009 | return inode; | |
2010 | } | |
2011 | ||
2012 | /* creates in fs root directory, so non-renamable and non-linkable. | |
2013 | * so inode and dentry are paired, until device reconfig. | |
2014 | */ | |
2015 | static struct inode * | |
2016 | gadgetfs_create_file (struct super_block *sb, char const *name, | |
99ac48f5 | 2017 | void *data, const struct file_operations *fops, |
1da177e4 LT |
2018 | struct dentry **dentry_p) |
2019 | { | |
2020 | struct dentry *dentry; | |
2021 | struct inode *inode; | |
2022 | ||
2023 | dentry = d_alloc_name(sb->s_root, name); | |
2024 | if (!dentry) | |
2025 | return NULL; | |
2026 | ||
2027 | inode = gadgetfs_make_inode (sb, data, fops, | |
2028 | S_IFREG | (default_perm & S_IRWXUGO)); | |
2029 | if (!inode) { | |
2030 | dput(dentry); | |
2031 | return NULL; | |
2032 | } | |
2033 | d_add (dentry, inode); | |
2034 | *dentry_p = dentry; | |
2035 | return inode; | |
2036 | } | |
2037 | ||
b87221de | 2038 | static const struct super_operations gadget_fs_operations = { |
1da177e4 LT |
2039 | .statfs = simple_statfs, |
2040 | .drop_inode = generic_delete_inode, | |
2041 | }; | |
2042 | ||
2043 | static int | |
2044 | gadgetfs_fill_super (struct super_block *sb, void *opts, int silent) | |
2045 | { | |
2046 | struct inode *inode; | |
2047 | struct dentry *d; | |
2048 | struct dev_data *dev; | |
2049 | ||
2050 | if (the_device) | |
2051 | return -ESRCH; | |
2052 | ||
2053 | /* fake probe to determine $CHIP */ | |
b0fca50f | 2054 | (void) usb_gadget_probe_driver(&probe_driver, gadgetfs_probe); |
1da177e4 LT |
2055 | if (!CHIP) |
2056 | return -ENODEV; | |
2057 | ||
2058 | /* superblock */ | |
2059 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
2060 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
2061 | sb->s_magic = GADGETFS_MAGIC; | |
2062 | sb->s_op = &gadget_fs_operations; | |
2063 | sb->s_time_gran = 1; | |
2064 | ||
2065 | /* root inode */ | |
2066 | inode = gadgetfs_make_inode (sb, | |
2067 | NULL, &simple_dir_operations, | |
2068 | S_IFDIR | S_IRUGO | S_IXUGO); | |
2069 | if (!inode) | |
0ae4ea80 | 2070 | goto enomem0; |
1da177e4 | 2071 | inode->i_op = &simple_dir_inode_operations; |
0ae4ea80 AS |
2072 | if (!(d = d_alloc_root (inode))) |
2073 | goto enomem1; | |
1da177e4 LT |
2074 | sb->s_root = d; |
2075 | ||
2076 | /* the ep0 file is named after the controller we expect; | |
2077 | * user mode code can use it for sanity checks, like we do. | |
2078 | */ | |
2079 | dev = dev_new (); | |
2080 | if (!dev) | |
0ae4ea80 | 2081 | goto enomem2; |
1da177e4 LT |
2082 | |
2083 | dev->sb = sb; | |
0ae4ea80 | 2084 | if (!gadgetfs_create_file (sb, CHIP, |
1da177e4 | 2085 | dev, &dev_init_operations, |
0ae4ea80 AS |
2086 | &dev->dentry)) |
2087 | goto enomem3; | |
1da177e4 LT |
2088 | |
2089 | /* other endpoint files are available after hardware setup, | |
2090 | * from binding to a controller. | |
2091 | */ | |
2092 | the_device = dev; | |
2093 | return 0; | |
0ae4ea80 AS |
2094 | |
2095 | enomem3: | |
2096 | put_dev (dev); | |
2097 | enomem2: | |
2098 | dput (d); | |
2099 | enomem1: | |
2100 | iput (inode); | |
2101 | enomem0: | |
2102 | return -ENOMEM; | |
1da177e4 LT |
2103 | } |
2104 | ||
2105 | /* "mount -t gadgetfs path /dev/gadget" ends up here */ | |
fc14f2fe AV |
2106 | static struct dentry * |
2107 | gadgetfs_mount (struct file_system_type *t, int flags, | |
2108 | const char *path, void *opts) | |
1da177e4 | 2109 | { |
fc14f2fe | 2110 | return mount_single (t, flags, opts, gadgetfs_fill_super); |
1da177e4 LT |
2111 | } |
2112 | ||
2113 | static void | |
2114 | gadgetfs_kill_sb (struct super_block *sb) | |
2115 | { | |
2116 | kill_litter_super (sb); | |
2117 | if (the_device) { | |
2118 | put_dev (the_device); | |
2119 | the_device = NULL; | |
2120 | } | |
2121 | } | |
2122 | ||
2123 | /*----------------------------------------------------------------------*/ | |
2124 | ||
2125 | static struct file_system_type gadgetfs_type = { | |
2126 | .owner = THIS_MODULE, | |
2127 | .name = shortname, | |
fc14f2fe | 2128 | .mount = gadgetfs_mount, |
1da177e4 LT |
2129 | .kill_sb = gadgetfs_kill_sb, |
2130 | }; | |
2131 | ||
2132 | /*----------------------------------------------------------------------*/ | |
2133 | ||
2134 | static int __init init (void) | |
2135 | { | |
2136 | int status; | |
2137 | ||
2138 | status = register_filesystem (&gadgetfs_type); | |
2139 | if (status == 0) | |
2140 | pr_info ("%s: %s, version " DRIVER_VERSION "\n", | |
2141 | shortname, driver_desc); | |
2142 | return status; | |
2143 | } | |
2144 | module_init (init); | |
2145 | ||
2146 | static void __exit cleanup (void) | |
2147 | { | |
2148 | pr_debug ("unregister %s\n", shortname); | |
2149 | unregister_filesystem (&gadgetfs_type); | |
2150 | } | |
2151 | module_exit (cleanup); | |
2152 |