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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 | ||
2505107d | 23 | // #define DEBUG /* data to help fault diagnosis */ |
1da177e4 LT |
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> | |
e22fc27c | 35 | #include <linux/poll.h> |
1da177e4 LT |
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/$CHIP is configured | |
58 | * (by writing configuration and device descriptors). Afterwards it | |
59 | * may serve as a source of device events, used to handle all control | |
60 | * requests other than basic enumeration. | |
61 | * | |
511779fd PE |
62 | * - Then, after a SET_CONFIGURATION control request, ep_config() is |
63 | * called when each /dev/gadget/ep* file is configured (by writing | |
64 | * endpoint descriptors). Afterwards these files are used to write() | |
65 | * IN data or to read() OUT data. To halt the endpoint, a "wrong | |
66 | * direction" request is issued (like reading an IN endpoint). | |
1da177e4 LT |
67 | * |
68 | * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe | |
69 | * not possible on all hardware. For example, precise fault handling with | |
70 | * respect to data left in endpoint fifos after aborted operations; or | |
71 | * selective clearing of endpoint halts, to implement SET_INTERFACE. | |
72 | */ | |
73 | ||
74 | #define DRIVER_DESC "USB Gadget filesystem" | |
75 | #define DRIVER_VERSION "24 Aug 2004" | |
76 | ||
77 | static const char driver_desc [] = DRIVER_DESC; | |
78 | static const char shortname [] = "gadgetfs"; | |
79 | ||
80 | MODULE_DESCRIPTION (DRIVER_DESC); | |
81 | MODULE_AUTHOR ("David Brownell"); | |
82 | MODULE_LICENSE ("GPL"); | |
83 | ||
84 | ||
85 | /*----------------------------------------------------------------------*/ | |
86 | ||
87 | #define GADGETFS_MAGIC 0xaee71ee7 | |
88 | #define DMA_ADDR_INVALID (~(dma_addr_t)0) | |
89 | ||
90 | /* /dev/gadget/$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 { | |
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)); | |
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 | ||
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 | |
093cf723 | 277 | * precise FIFO status when recovering from cancellation. |
1da177e4 LT |
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; | |
511779fd | 315 | |
1da177e4 LT |
316 | switch (epdata->state) { |
317 | case STATE_EP_ENABLED: | |
318 | break; | |
1da177e4 LT |
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; | |
1da177e4 LT |
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 | { | |
6e9a4738 | 335 | DECLARE_COMPLETION_ONSTACK (done); |
1da177e4 LT |
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; | |
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: | |
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; | |
e94b1766 | 449 | kbuf = kmalloc (len, GFP_KERNEL); |
1da177e4 LT |
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); | |
1bbc1696 DB |
458 | VDEBUG (data->dev, "%s write %zu IN, status %d\n", |
459 | data->name, len, (int) value); | |
1da177e4 LT |
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; | |
ba307f58 MS |
470 | int value; |
471 | ||
472 | if ((value = down_interruptible(&data->lock)) < 0) | |
473 | return value; | |
1da177e4 LT |
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; | |
4809ecc2 | 480 | usb_ep_disable(data->ep); |
1da177e4 | 481 | } |
ba307f58 | 482 | up (&data->lock); |
1da177e4 LT |
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; | |
027445c3 BP |
526 | const struct iovec *iv; |
527 | unsigned long nr_segs; | |
1da177e4 LT |
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; | |
027445c3 BP |
555 | ssize_t len, total; |
556 | int i; | |
557 | ||
2505107d DB |
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; | |
1da177e4 LT |
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; | |
027445c3 | 593 | if (priv->iv == NULL |
83196b52 | 594 | || unlikely(req->actual == 0) |
1da177e4 LT |
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, | |
027445c3 | 628 | const struct iovec *iv, |
2505107d | 629 | unsigned long nr_segs |
1da177e4 LT |
630 | ) |
631 | { | |
83196b52 | 632 | struct kiocb_priv *priv; |
1da177e4 LT |
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; | |
027445c3 BP |
644 | priv->iv = iv; |
645 | priv->nr_segs = nr_segs; | |
1da177e4 LT |
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 | |
027445c3 | 685 | value = (iv ? -EIOCBRETRY : -EIOCBQUEUED); |
1da177e4 LT |
686 | return value; |
687 | } | |
688 | ||
689 | static ssize_t | |
027445c3 BP |
690 | ep_aio_read(struct kiocb *iocb, const struct iovec *iov, |
691 | unsigned long nr_segs, loff_t o) | |
1da177e4 LT |
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; | |
027445c3 BP |
698 | |
699 | buf = kmalloc(iocb->ki_left, GFP_KERNEL); | |
1da177e4 LT |
700 | if (unlikely(!buf)) |
701 | return -ENOMEM; | |
027445c3 | 702 | |
1da177e4 | 703 | iocb->ki_retry = ep_aio_read_retry; |
027445c3 | 704 | return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs); |
1da177e4 LT |
705 | } |
706 | ||
707 | static ssize_t | |
027445c3 BP |
708 | ep_aio_write(struct kiocb *iocb, const struct iovec *iov, |
709 | unsigned long nr_segs, loff_t o) | |
1da177e4 LT |
710 | { |
711 | struct ep_data *epdata = iocb->ki_filp->private_data; | |
712 | char *buf; | |
027445c3 BP |
713 | size_t len = 0; |
714 | int i = 0; | |
1da177e4 LT |
715 | |
716 | if (unlikely(!(epdata->desc.bEndpointAddress & USB_DIR_IN))) | |
717 | return -EINVAL; | |
027445c3 BP |
718 | |
719 | buf = kmalloc(iocb->ki_left, GFP_KERNEL); | |
1da177e4 LT |
720 | if (unlikely(!buf)) |
721 | return -ENOMEM; | |
027445c3 BP |
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; | |
1da177e4 | 730 | } |
027445c3 | 731 | return ep_aio_rwtail(iocb, buf, len, epdata, NULL, 0); |
1da177e4 LT |
732 | } |
733 | ||
734 | /*----------------------------------------------------------------------*/ | |
735 | ||
736 | /* used after endpoint configuration */ | |
066202dd | 737 | static const struct file_operations ep_io_operations = { |
1da177e4 LT |
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; | |
8a7471ab | 769 | int value, length = len; |
1da177e4 LT |
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 | } | |
1da177e4 LT |
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; | |
98416333 | 836 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
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: | |
511779fd | 845 | DBG(data->dev, "unconnected, %s init abandoned\n", |
1da177e4 | 846 | data->name); |
511779fd | 847 | value = -EINVAL; |
1da177e4 | 848 | } |
8a7471ab | 849 | if (value == 0) { |
1da177e4 | 850 | fd->f_op = &ep_io_operations; |
8a7471ab MS |
851 | value = length; |
852 | } | |
1da177e4 LT |
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 | { | |
8e18e294 | 873 | struct ep_data *data = inode->i_private; |
1da177e4 LT |
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 */ | |
066202dd | 896 | static const struct file_operations ep_config_operations = { |
1da177e4 LT |
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; | |
5b89db02 | 936 | unsigned long flags; |
1da177e4 LT |
937 | int free = 1; |
938 | ||
939 | /* for control OUT, data must still get to userspace */ | |
5b89db02 | 940 | spin_lock_irqsave(&dev->lock, flags); |
1da177e4 LT |
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); | |
7489d149 | 947 | } |
1da177e4 LT |
948 | |
949 | /* clean up as appropriate */ | |
950 | if (free && req->buf != &dev->rbuf) | |
951 | clean_req (ep, req); | |
952 | req->complete = epio_complete; | |
5b89db02 | 953 | spin_unlock_irqrestore(&dev->lock, flags); |
1da177e4 LT |
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; | |
97906369 | 972 | req->zero = 0; |
1da177e4 LT |
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 */ | |
7489d149 | 993 | if ((state = dev->state) == STATE_DEV_SETUP) { |
1da177e4 LT |
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; | |
7489d149 | 999 | dev->state = STATE_DEV_CONNECTED; |
1da177e4 LT |
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); | |
7489d149 | 1007 | dev->state = STATE_DEV_CONNECTED; |
1da177e4 LT |
1008 | |
1009 | /* assume that was SET_CONFIGURATION */ | |
1010 | if (dev->current_config) { | |
1011 | unsigned power; | |
98416333 | 1012 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
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; | |
5b89db02 DB |
1035 | |
1036 | if (dev->state != STATE_DEV_SETUP) { | |
1037 | retval = -ECANCELED; | |
1038 | goto done; | |
1039 | } | |
1040 | dev->state = STATE_DEV_CONNECTED; | |
1041 | ||
1da177e4 LT |
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 ... | |
997694de | 1047 | if (copy_to_user (buf, dev->req->buf, len)) |
1da177e4 LT |
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; | |
1da177e4 | 1068 | |
1da177e4 | 1069 | n = len / sizeof (struct usb_gadgetfs_event); |
0864c7a9 DB |
1070 | if (dev->ev_next < n) |
1071 | n = dev->ev_next; | |
1da177e4 | 1072 | |
0864c7a9 | 1073 | /* ep0 i/o has special semantics during STATE_DEV_SETUP */ |
1da177e4 LT |
1074 | for (i = 0; i < n; i++) { |
1075 | if (dev->event [i].type == GADGETFS_SETUP) { | |
0864c7a9 DB |
1076 | dev->state = STATE_DEV_SETUP; |
1077 | n = i + 1; | |
1da177e4 LT |
1078 | break; |
1079 | } | |
1080 | } | |
1081 | spin_unlock_irq (&dev->lock); | |
0864c7a9 | 1082 | len = n * sizeof (struct usb_gadgetfs_event); |
1da177e4 LT |
1083 | if (copy_to_user (buf, &dev->event, len)) |
1084 | retval = -EFAULT; | |
1085 | else | |
1086 | retval = len; | |
1087 | if (len > 0) { | |
1da177e4 LT |
1088 | /* NOTE this doesn't guard against broken drivers; |
1089 | * concurrent ep0 readers may lose events. | |
1090 | */ | |
1091 | spin_lock_irq (&dev->lock); | |
0864c7a9 DB |
1092 | if (dev->ev_next > n) { |
1093 | memmove(&dev->event[0], &dev->event[n], | |
1da177e4 | 1094 | sizeof (struct usb_gadgetfs_event) |
0864c7a9 DB |
1095 | * (dev->ev_next - n)); |
1096 | } | |
1097 | dev->ev_next -= n; | |
1da177e4 LT |
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; | |
7489d149 DB |
1112 | case STATE_DEV_UNCONNECTED: |
1113 | case STATE_DEV_CONNECTED: | |
1da177e4 LT |
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: | |
7489d149 | 1140 | if (dev->state == STATE_DEV_SETUP) |
1da177e4 LT |
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; | |
0864c7a9 | 1152 | DBG(dev, "discard old event[%d] %d\n", i, type); |
1da177e4 LT |
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 | } | |
0864c7a9 | 1165 | VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type); |
1da177e4 LT |
1166 | event = &dev->event [dev->ev_next++]; |
1167 | BUG_ON (dev->ev_next > N_EVENT); | |
1da177e4 LT |
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 */ | |
7489d149 | 1187 | } else if (dev->state == STATE_DEV_SETUP) { |
1da177e4 LT |
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) { | |
5b89db02 | 1193 | dev->state = STATE_DEV_CONNECTED; |
1da177e4 LT |
1194 | spin_unlock_irq (&dev->lock); |
1195 | if (copy_from_user (dev->req->buf, buf, len)) | |
1196 | retval = -EFAULT; | |
97906369 AS |
1197 | else { |
1198 | if (len < dev->setup_wLength) | |
1199 | dev->req->zero = 1; | |
1da177e4 LT |
1200 | retval = usb_ep_queue ( |
1201 | dev->gadget->ep0, dev->req, | |
1202 | GFP_KERNEL); | |
97906369 | 1203 | } |
1da177e4 LT |
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; | |
7489d149 | 1219 | dev->state = STATE_DEV_CONNECTED; |
1da177e4 LT |
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 */ | |
7489d149 | 1261 | spin_lock_irq(&dev->lock); |
1da177e4 | 1262 | dev->state = STATE_DEV_DISABLED; |
7489d149 | 1263 | spin_unlock_irq(&dev->lock); |
1da177e4 LT |
1264 | return 0; |
1265 | } | |
1266 | ||
e22fc27c MS |
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 | ||
7489d149 | 1284 | if (dev->state == STATE_DEV_SETUP) { |
e22fc27c MS |
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 | ||
1da177e4 LT |
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 */ | |
066202dd | 1308 | static const struct file_operations ep0_io_operations = { |
1da177e4 LT |
1309 | .owner = THIS_MODULE, |
1310 | .llseek = no_llseek, | |
1311 | ||
1312 | .read = ep0_read, | |
1313 | .write = ep0_write, | |
1314 | .fasync = ep0_fasync, | |
e22fc27c | 1315 | .poll = ep0_poll, |
1da177e4 LT |
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 | ||
98416333 | 1328 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
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; | |
98416333 | 1357 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
1358 | int hs; |
1359 | #endif | |
1360 | ||
1361 | /* only one configuration */ | |
1362 | if (index > 0) | |
1363 | return -EINVAL; | |
1364 | ||
98416333 | 1365 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
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; | |
1bbc1696 DB |
1389 | u16 w_value = le16_to_cpu(ctrl->wValue); |
1390 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
1da177e4 LT |
1391 | |
1392 | spin_lock (&dev->lock); | |
1393 | dev->setup_abort = 0; | |
7489d149 | 1394 | if (dev->state == STATE_DEV_UNCONNECTED) { |
98416333 | 1395 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 | 1396 | if (gadget->speed == USB_SPEED_HIGH && dev->hs_config == 0) { |
ce46794f | 1397 | spin_unlock(&dev->lock); |
1da177e4 LT |
1398 | ERROR (dev, "no high speed config??\n"); |
1399 | return -EINVAL; | |
1400 | } | |
98416333 | 1401 | #endif /* CONFIG_USB_GADGET_DUALSPEED */ |
1da177e4 | 1402 | |
ce46794f DB |
1403 | dev->state = STATE_DEV_CONNECTED; |
1404 | dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket; | |
1405 | ||
1da177e4 LT |
1406 | INFO (dev, "connected\n"); |
1407 | event = next_event (dev, GADGETFS_CONNECT); | |
1408 | event->u.speed = gadget->speed; | |
1409 | ep0_readable (dev); | |
1410 | ||
1da177e4 LT |
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 | */ | |
7489d149 | 1416 | } else if (dev->state == STATE_DEV_SETUP) |
1da177e4 LT |
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; | |
98416333 | 1434 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
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; | |
98416333 | 1471 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
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; | |
97906369 | 1530 | dev->setup_wLength = w_length; |
1da177e4 LT |
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? */ | |
7489d149 | 1562 | if (value >= 0 && dev->state != STATE_DEV_SETUP) { |
1da177e4 LT |
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 */ | |
1b1dcc1b | 1610 | mutex_lock (&parent->i_mutex); |
1da177e4 LT |
1611 | d_delete (dentry); |
1612 | dput (dentry); | |
1b1dcc1b | 1613 | mutex_unlock (&parent->i_mutex); |
1da177e4 LT |
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, | |
99ac48f5 | 1624 | void *data, const struct file_operations *fops, |
1da177e4 LT |
1625 | struct dentry **dentry_p); |
1626 | ||
1627 | static int activate_ep_files (struct dev_data *dev) | |
1628 | { | |
1629 | struct usb_ep *ep; | |
0ae4ea80 | 1630 | struct ep_data *data; |
1da177e4 LT |
1631 | |
1632 | gadget_for_each_ep (ep, dev->gadget) { | |
1da177e4 | 1633 | |
7039f422 | 1634 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 | 1635 | if (!data) |
0ae4ea80 | 1636 | goto enomem0; |
1da177e4 LT |
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) | |
0ae4ea80 | 1651 | goto enomem1; |
1da177e4 LT |
1652 | |
1653 | data->inode = gadgetfs_create_file (dev->sb, data->name, | |
1654 | data, &ep_config_operations, | |
1655 | &data->dentry); | |
0ae4ea80 AS |
1656 | if (!data->inode) |
1657 | goto enomem2; | |
1da177e4 LT |
1658 | list_add_tail (&data->epfiles, &dev->epfiles); |
1659 | } | |
1660 | return 0; | |
1661 | ||
0ae4ea80 AS |
1662 | enomem2: |
1663 | usb_ep_free_request (ep, data->req); | |
1664 | enomem1: | |
1665 | put_dev (dev); | |
1666 | kfree (data); | |
1667 | enomem0: | |
1da177e4 LT |
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); | |
7489d149 DB |
1726 | spin_lock_irq(&dev->lock); |
1727 | dev->state = STATE_DEV_UNCONNECTED; | |
1728 | spin_unlock_irq(&dev->lock); | |
1da177e4 LT |
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 | ||
07cb7f23 | 1742 | spin_lock (&dev->lock); |
7489d149 | 1743 | if (dev->state == STATE_DEV_UNCONNECTED) |
07cb7f23 | 1744 | goto exit; |
7489d149 | 1745 | dev->state = STATE_DEV_UNCONNECTED; |
1da177e4 LT |
1746 | |
1747 | INFO (dev, "disconnected\n"); | |
1da177e4 LT |
1748 | next_event (dev, GADGETFS_DISCONNECT); |
1749 | ep0_readable (dev); | |
07cb7f23 | 1750 | exit: |
1da177e4 LT |
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) { | |
7489d149 DB |
1762 | case STATE_DEV_SETUP: // VERY odd... host died?? |
1763 | case STATE_DEV_CONNECTED: | |
1764 | case STATE_DEV_UNCONNECTED: | |
1da177e4 LT |
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 = { | |
98416333 | 1775 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
1da177e4 LT |
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 | ||
2505107d | 1787 | .driver = { |
1da177e4 | 1788 | .name = (char *) shortname, |
1da177e4 LT |
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, | |
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 | ||
e94b1766 | 1871 | kbuf = kmalloc (length, GFP_KERNEL); |
1da177e4 LT |
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 | { | |
8e18e294 | 1948 | struct dev_data *dev = inode->i_private; |
1da177e4 LT |
1949 | int value = -EBUSY; |
1950 | ||
7489d149 | 1951 | spin_lock_irq(&dev->lock); |
1da177e4 LT |
1952 | if (dev->state == STATE_DEV_DISABLED) { |
1953 | dev->ev_next = 0; | |
7489d149 | 1954 | dev->state = STATE_DEV_OPENED; |
1da177e4 LT |
1955 | fd->private_data = dev; |
1956 | get_dev (dev); | |
1957 | value = 0; | |
1958 | } | |
7489d149 | 1959 | spin_unlock_irq(&dev->lock); |
1da177e4 LT |
1960 | return value; |
1961 | } | |
1962 | ||
066202dd | 1963 | static const struct file_operations dev_init_operations = { |
1da177e4 LT |
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, | |
99ac48f5 | 1998 | void *data, const struct file_operations *fops, |
1da177e4 LT |
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; | |
1da177e4 LT |
2007 | inode->i_blocks = 0; |
2008 | inode->i_atime = inode->i_mtime = inode->i_ctime | |
2009 | = CURRENT_TIME; | |
8e18e294 | 2010 | inode->i_private = data; |
1da177e4 LT |
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, | |
99ac48f5 | 2021 | void *data, const struct file_operations *fops, |
1da177e4 LT |
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) | |
0ae4ea80 | 2074 | goto enomem0; |
1da177e4 | 2075 | inode->i_op = &simple_dir_inode_operations; |
0ae4ea80 AS |
2076 | if (!(d = d_alloc_root (inode))) |
2077 | goto enomem1; | |
1da177e4 LT |
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) | |
0ae4ea80 | 2085 | goto enomem2; |
1da177e4 LT |
2086 | |
2087 | dev->sb = sb; | |
0ae4ea80 | 2088 | if (!gadgetfs_create_file (sb, CHIP, |
1da177e4 | 2089 | dev, &dev_init_operations, |
0ae4ea80 AS |
2090 | &dev->dentry)) |
2091 | goto enomem3; | |
1da177e4 LT |
2092 | |
2093 | /* other endpoint files are available after hardware setup, | |
2094 | * from binding to a controller. | |
2095 | */ | |
2096 | the_device = dev; | |
2097 | return 0; | |
0ae4ea80 AS |
2098 | |
2099 | enomem3: | |
2100 | put_dev (dev); | |
2101 | enomem2: | |
2102 | dput (d); | |
2103 | enomem1: | |
2104 | iput (inode); | |
2105 | enomem0: | |
2106 | return -ENOMEM; | |
1da177e4 LT |
2107 | } |
2108 | ||
2109 | /* "mount -t gadgetfs path /dev/gadget" ends up here */ | |
454e2398 | 2110 | static int |
1da177e4 | 2111 | gadgetfs_get_sb (struct file_system_type *t, int flags, |
454e2398 | 2112 | const char *path, void *opts, struct vfsmount *mnt) |
1da177e4 | 2113 | { |
454e2398 | 2114 | return get_sb_single (t, flags, opts, gadgetfs_fill_super, mnt); |
1da177e4 LT |
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 |