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Commit | Line | Data |
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afba937e ON |
1 | /* |
2 | * cdc-wdm.c | |
3 | * | |
4 | * This driver supports USB CDC WCM Device Management. | |
5 | * | |
052fbc0d | 6 | * Copyright (c) 2007-2009 Oliver Neukum |
afba937e ON |
7 | * |
8 | * Some code taken from cdc-acm.c | |
9 | * | |
10 | * Released under the GPLv2. | |
11 | * | |
12 | * Many thanks to Carl Nordbeck | |
13 | */ | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/module.h> | |
afba937e ON |
18 | #include <linux/mutex.h> |
19 | #include <linux/uaccess.h> | |
20 | #include <linux/bitops.h> | |
21 | #include <linux/poll.h> | |
22 | #include <linux/usb.h> | |
23 | #include <linux/usb/cdc.h> | |
24 | #include <asm/byteorder.h> | |
25 | #include <asm/unaligned.h> | |
26 | ||
27 | /* | |
28 | * Version Information | |
29 | */ | |
87d65e54 | 30 | #define DRIVER_VERSION "v0.03" |
afba937e | 31 | #define DRIVER_AUTHOR "Oliver Neukum" |
87d65e54 | 32 | #define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management" |
afba937e | 33 | |
6ef4852b | 34 | static const struct usb_device_id wdm_ids[] = { |
afba937e ON |
35 | { |
36 | .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS | | |
37 | USB_DEVICE_ID_MATCH_INT_SUBCLASS, | |
38 | .bInterfaceClass = USB_CLASS_COMM, | |
39 | .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM | |
40 | }, | |
41 | { } | |
42 | }; | |
43 | ||
aa5380b9 ON |
44 | MODULE_DEVICE_TABLE (usb, wdm_ids); |
45 | ||
afba937e ON |
46 | #define WDM_MINOR_BASE 176 |
47 | ||
48 | ||
49 | #define WDM_IN_USE 1 | |
50 | #define WDM_DISCONNECTING 2 | |
51 | #define WDM_RESULT 3 | |
52 | #define WDM_READ 4 | |
53 | #define WDM_INT_STALL 5 | |
54 | #define WDM_POLL_RUNNING 6 | |
922a5ead | 55 | #define WDM_RESPONDING 7 |
beb1d35f | 56 | #define WDM_SUSPENDING 8 |
afba937e ON |
57 | |
58 | #define WDM_MAX 16 | |
59 | ||
60 | ||
61 | static DEFINE_MUTEX(wdm_mutex); | |
62 | ||
63 | /* --- method tables --- */ | |
64 | ||
65 | struct wdm_device { | |
66 | u8 *inbuf; /* buffer for response */ | |
67 | u8 *outbuf; /* buffer for command */ | |
68 | u8 *sbuf; /* buffer for status */ | |
69 | u8 *ubuf; /* buffer for copy to user space */ | |
70 | ||
71 | struct urb *command; | |
72 | struct urb *response; | |
73 | struct urb *validity; | |
74 | struct usb_interface *intf; | |
75 | struct usb_ctrlrequest *orq; | |
76 | struct usb_ctrlrequest *irq; | |
77 | spinlock_t iuspin; | |
78 | ||
79 | unsigned long flags; | |
80 | u16 bufsize; | |
81 | u16 wMaxCommand; | |
82 | u16 wMaxPacketSize; | |
83 | u16 bMaxPacketSize0; | |
84 | __le16 inum; | |
85 | int reslength; | |
86 | int length; | |
87 | int read; | |
88 | int count; | |
89 | dma_addr_t shandle; | |
90 | dma_addr_t ihandle; | |
860e41a7 | 91 | struct mutex lock; |
afba937e ON |
92 | wait_queue_head_t wait; |
93 | struct work_struct rxwork; | |
94 | int werr; | |
95 | int rerr; | |
96 | }; | |
97 | ||
98 | static struct usb_driver wdm_driver; | |
99 | ||
100 | /* --- callbacks --- */ | |
101 | static void wdm_out_callback(struct urb *urb) | |
102 | { | |
103 | struct wdm_device *desc; | |
104 | desc = urb->context; | |
105 | spin_lock(&desc->iuspin); | |
106 | desc->werr = urb->status; | |
107 | spin_unlock(&desc->iuspin); | |
108 | clear_bit(WDM_IN_USE, &desc->flags); | |
109 | kfree(desc->outbuf); | |
110 | wake_up(&desc->wait); | |
111 | } | |
112 | ||
113 | static void wdm_in_callback(struct urb *urb) | |
114 | { | |
115 | struct wdm_device *desc = urb->context; | |
116 | int status = urb->status; | |
117 | ||
118 | spin_lock(&desc->iuspin); | |
922a5ead | 119 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
120 | |
121 | if (status) { | |
122 | switch (status) { | |
123 | case -ENOENT: | |
124 | dev_dbg(&desc->intf->dev, | |
125 | "nonzero urb status received: -ENOENT"); | |
922a5ead | 126 | goto skip_error; |
afba937e ON |
127 | case -ECONNRESET: |
128 | dev_dbg(&desc->intf->dev, | |
129 | "nonzero urb status received: -ECONNRESET"); | |
922a5ead | 130 | goto skip_error; |
afba937e ON |
131 | case -ESHUTDOWN: |
132 | dev_dbg(&desc->intf->dev, | |
133 | "nonzero urb status received: -ESHUTDOWN"); | |
922a5ead | 134 | goto skip_error; |
afba937e | 135 | case -EPIPE: |
9908a32e GKH |
136 | dev_err(&desc->intf->dev, |
137 | "nonzero urb status received: -EPIPE\n"); | |
afba937e ON |
138 | break; |
139 | default: | |
9908a32e GKH |
140 | dev_err(&desc->intf->dev, |
141 | "Unexpected error %d\n", status); | |
afba937e ON |
142 | break; |
143 | } | |
144 | } | |
145 | ||
146 | desc->rerr = status; | |
147 | desc->reslength = urb->actual_length; | |
148 | memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength); | |
149 | desc->length += desc->reslength; | |
922a5ead | 150 | skip_error: |
afba937e ON |
151 | wake_up(&desc->wait); |
152 | ||
153 | set_bit(WDM_READ, &desc->flags); | |
154 | spin_unlock(&desc->iuspin); | |
155 | } | |
156 | ||
157 | static void wdm_int_callback(struct urb *urb) | |
158 | { | |
159 | int rv = 0; | |
160 | int status = urb->status; | |
161 | struct wdm_device *desc; | |
162 | struct usb_ctrlrequest *req; | |
163 | struct usb_cdc_notification *dr; | |
164 | ||
165 | desc = urb->context; | |
166 | req = desc->irq; | |
167 | dr = (struct usb_cdc_notification *)desc->sbuf; | |
168 | ||
169 | if (status) { | |
170 | switch (status) { | |
171 | case -ESHUTDOWN: | |
172 | case -ENOENT: | |
173 | case -ECONNRESET: | |
174 | return; /* unplug */ | |
175 | case -EPIPE: | |
176 | set_bit(WDM_INT_STALL, &desc->flags); | |
9908a32e | 177 | dev_err(&desc->intf->dev, "Stall on int endpoint\n"); |
afba937e ON |
178 | goto sw; /* halt is cleared in work */ |
179 | default: | |
9908a32e GKH |
180 | dev_err(&desc->intf->dev, |
181 | "nonzero urb status received: %d\n", status); | |
afba937e ON |
182 | break; |
183 | } | |
184 | } | |
185 | ||
186 | if (urb->actual_length < sizeof(struct usb_cdc_notification)) { | |
9908a32e GKH |
187 | dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n", |
188 | urb->actual_length); | |
afba937e ON |
189 | goto exit; |
190 | } | |
191 | ||
192 | switch (dr->bNotificationType) { | |
193 | case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: | |
194 | dev_dbg(&desc->intf->dev, | |
195 | "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d", | |
196 | dr->wIndex, dr->wLength); | |
197 | break; | |
198 | ||
199 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
200 | ||
201 | dev_dbg(&desc->intf->dev, | |
202 | "NOTIFY_NETWORK_CONNECTION %s network", | |
203 | dr->wValue ? "connected to" : "disconnected from"); | |
204 | goto exit; | |
205 | default: | |
206 | clear_bit(WDM_POLL_RUNNING, &desc->flags); | |
9908a32e GKH |
207 | dev_err(&desc->intf->dev, |
208 | "unknown notification %d received: index %d len %d\n", | |
afba937e ON |
209 | dr->bNotificationType, dr->wIndex, dr->wLength); |
210 | goto exit; | |
211 | } | |
212 | ||
213 | req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); | |
214 | req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; | |
215 | req->wValue = 0; | |
216 | req->wIndex = desc->inum; | |
87d65e54 | 217 | req->wLength = cpu_to_le16(desc->wMaxCommand); |
afba937e ON |
218 | |
219 | usb_fill_control_urb( | |
220 | desc->response, | |
221 | interface_to_usbdev(desc->intf), | |
222 | /* using common endpoint 0 */ | |
223 | usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), | |
224 | (unsigned char *)req, | |
225 | desc->inbuf, | |
87d65e54 | 226 | desc->wMaxCommand, |
afba937e ON |
227 | wdm_in_callback, |
228 | desc | |
229 | ); | |
230 | desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
231 | spin_lock(&desc->iuspin); | |
232 | clear_bit(WDM_READ, &desc->flags); | |
922a5ead | 233 | set_bit(WDM_RESPONDING, &desc->flags); |
beb1d35f ON |
234 | if (!test_bit(WDM_DISCONNECTING, &desc->flags) |
235 | && !test_bit(WDM_SUSPENDING, &desc->flags)) { | |
afba937e ON |
236 | rv = usb_submit_urb(desc->response, GFP_ATOMIC); |
237 | dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d", | |
238 | __func__, rv); | |
239 | } | |
240 | spin_unlock(&desc->iuspin); | |
241 | if (rv < 0) { | |
922a5ead | 242 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
243 | if (rv == -EPERM) |
244 | return; | |
245 | if (rv == -ENOMEM) { | |
246 | sw: | |
247 | rv = schedule_work(&desc->rxwork); | |
248 | if (rv) | |
9908a32e GKH |
249 | dev_err(&desc->intf->dev, |
250 | "Cannot schedule work\n"); | |
afba937e ON |
251 | } |
252 | } | |
253 | exit: | |
254 | rv = usb_submit_urb(urb, GFP_ATOMIC); | |
255 | if (rv) | |
9908a32e GKH |
256 | dev_err(&desc->intf->dev, |
257 | "%s - usb_submit_urb failed with result %d\n", | |
258 | __func__, rv); | |
afba937e ON |
259 | |
260 | } | |
261 | ||
262 | static void kill_urbs(struct wdm_device *desc) | |
263 | { | |
17d80d56 | 264 | /* the order here is essential */ |
afba937e ON |
265 | usb_kill_urb(desc->command); |
266 | usb_kill_urb(desc->validity); | |
267 | usb_kill_urb(desc->response); | |
268 | } | |
269 | ||
270 | static void free_urbs(struct wdm_device *desc) | |
271 | { | |
272 | usb_free_urb(desc->validity); | |
273 | usb_free_urb(desc->response); | |
274 | usb_free_urb(desc->command); | |
275 | } | |
276 | ||
277 | static void cleanup(struct wdm_device *desc) | |
278 | { | |
279 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
280 | desc->wMaxPacketSize, | |
281 | desc->sbuf, | |
282 | desc->validity->transfer_dma); | |
283 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
87d65e54 | 284 | desc->wMaxCommand, |
afba937e ON |
285 | desc->inbuf, |
286 | desc->response->transfer_dma); | |
287 | kfree(desc->orq); | |
288 | kfree(desc->irq); | |
289 | kfree(desc->ubuf); | |
290 | free_urbs(desc); | |
291 | kfree(desc); | |
292 | } | |
293 | ||
294 | static ssize_t wdm_write | |
295 | (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
296 | { | |
297 | u8 *buf; | |
298 | int rv = -EMSGSIZE, r, we; | |
299 | struct wdm_device *desc = file->private_data; | |
300 | struct usb_ctrlrequest *req; | |
301 | ||
302 | if (count > desc->wMaxCommand) | |
303 | count = desc->wMaxCommand; | |
304 | ||
305 | spin_lock_irq(&desc->iuspin); | |
306 | we = desc->werr; | |
307 | desc->werr = 0; | |
308 | spin_unlock_irq(&desc->iuspin); | |
309 | if (we < 0) | |
310 | return -EIO; | |
311 | ||
860e41a7 ON |
312 | desc->outbuf = buf = kmalloc(count, GFP_KERNEL); |
313 | if (!buf) { | |
314 | rv = -ENOMEM; | |
315 | goto outnl; | |
316 | } | |
317 | ||
318 | r = copy_from_user(buf, buffer, count); | |
319 | if (r > 0) { | |
320 | kfree(buf); | |
321 | rv = -EFAULT; | |
322 | goto outnl; | |
323 | } | |
324 | ||
325 | /* concurrent writes and disconnect */ | |
326 | r = mutex_lock_interruptible(&desc->lock); | |
afba937e | 327 | rv = -ERESTARTSYS; |
860e41a7 ON |
328 | if (r) { |
329 | kfree(buf); | |
afba937e | 330 | goto outnl; |
860e41a7 ON |
331 | } |
332 | ||
333 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
334 | kfree(buf); | |
335 | rv = -ENODEV; | |
336 | goto outnp; | |
337 | } | |
afba937e | 338 | |
17d80d56 | 339 | r = usb_autopm_get_interface(desc->intf); |
860e41a7 ON |
340 | if (r < 0) { |
341 | kfree(buf); | |
17d80d56 | 342 | goto outnp; |
860e41a7 | 343 | } |
7f1dc313 ON |
344 | |
345 | if (!file->f_flags && O_NONBLOCK) | |
346 | r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, | |
347 | &desc->flags)); | |
348 | else | |
349 | if (test_bit(WDM_IN_USE, &desc->flags)) | |
350 | r = -EAGAIN; | |
860e41a7 | 351 | if (r < 0) { |
afba937e | 352 | kfree(buf); |
afba937e ON |
353 | goto out; |
354 | } | |
355 | ||
356 | req = desc->orq; | |
357 | usb_fill_control_urb( | |
358 | desc->command, | |
359 | interface_to_usbdev(desc->intf), | |
360 | /* using common endpoint 0 */ | |
361 | usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), | |
362 | (unsigned char *)req, | |
363 | buf, | |
364 | count, | |
365 | wdm_out_callback, | |
366 | desc | |
367 | ); | |
368 | ||
369 | req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | | |
370 | USB_RECIP_INTERFACE); | |
371 | req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; | |
372 | req->wValue = 0; | |
373 | req->wIndex = desc->inum; | |
374 | req->wLength = cpu_to_le16(count); | |
375 | set_bit(WDM_IN_USE, &desc->flags); | |
376 | ||
377 | rv = usb_submit_urb(desc->command, GFP_KERNEL); | |
378 | if (rv < 0) { | |
379 | kfree(buf); | |
380 | clear_bit(WDM_IN_USE, &desc->flags); | |
9908a32e | 381 | dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); |
afba937e ON |
382 | } else { |
383 | dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", | |
384 | req->wIndex); | |
385 | } | |
386 | out: | |
17d80d56 ON |
387 | usb_autopm_put_interface(desc->intf); |
388 | outnp: | |
860e41a7 | 389 | mutex_unlock(&desc->lock); |
afba937e ON |
390 | outnl: |
391 | return rv < 0 ? rv : count; | |
392 | } | |
393 | ||
394 | static ssize_t wdm_read | |
395 | (struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
396 | { | |
7f1dc313 | 397 | int rv, cntr = 0; |
afba937e ON |
398 | int i = 0; |
399 | struct wdm_device *desc = file->private_data; | |
400 | ||
401 | ||
860e41a7 | 402 | rv = mutex_lock_interruptible(&desc->lock); /*concurrent reads */ |
afba937e ON |
403 | if (rv < 0) |
404 | return -ERESTARTSYS; | |
405 | ||
406 | if (desc->length == 0) { | |
407 | desc->read = 0; | |
408 | retry: | |
7f1dc313 ON |
409 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
410 | rv = -ENODEV; | |
411 | goto err; | |
412 | } | |
afba937e | 413 | i++; |
7f1dc313 ON |
414 | if (file->f_flags & O_NONBLOCK) { |
415 | if (!test_bit(WDM_READ, &desc->flags)) { | |
416 | rv = cntr ? cntr : -EAGAIN; | |
417 | goto err; | |
418 | } | |
419 | rv = 0; | |
420 | } else { | |
421 | rv = wait_event_interruptible(desc->wait, | |
422 | test_bit(WDM_READ, &desc->flags)); | |
423 | } | |
afba937e | 424 | |
7f1dc313 | 425 | /* may have happened while we slept */ |
17d80d56 ON |
426 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
427 | rv = -ENODEV; | |
428 | goto err; | |
429 | } | |
430 | usb_mark_last_busy(interface_to_usbdev(desc->intf)); | |
afba937e ON |
431 | if (rv < 0) { |
432 | rv = -ERESTARTSYS; | |
433 | goto err; | |
434 | } | |
435 | ||
436 | spin_lock_irq(&desc->iuspin); | |
437 | ||
438 | if (desc->rerr) { /* read completed, error happened */ | |
afba937e ON |
439 | desc->rerr = 0; |
440 | spin_unlock_irq(&desc->iuspin); | |
afba937e ON |
441 | rv = -EIO; |
442 | goto err; | |
443 | } | |
444 | /* | |
445 | * recheck whether we've lost the race | |
446 | * against the completion handler | |
447 | */ | |
448 | if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ | |
449 | spin_unlock_irq(&desc->iuspin); | |
450 | goto retry; | |
451 | } | |
452 | if (!desc->reslength) { /* zero length read */ | |
453 | spin_unlock_irq(&desc->iuspin); | |
454 | goto retry; | |
455 | } | |
456 | clear_bit(WDM_READ, &desc->flags); | |
457 | spin_unlock_irq(&desc->iuspin); | |
458 | } | |
459 | ||
460 | cntr = count > desc->length ? desc->length : count; | |
461 | rv = copy_to_user(buffer, desc->ubuf, cntr); | |
462 | if (rv > 0) { | |
463 | rv = -EFAULT; | |
464 | goto err; | |
465 | } | |
466 | ||
467 | for (i = 0; i < desc->length - cntr; i++) | |
468 | desc->ubuf[i] = desc->ubuf[i + cntr]; | |
469 | ||
470 | desc->length -= cntr; | |
87d65e54 ON |
471 | /* in case we had outstanding data */ |
472 | if (!desc->length) | |
473 | clear_bit(WDM_READ, &desc->flags); | |
afba937e ON |
474 | rv = cntr; |
475 | ||
476 | err: | |
860e41a7 | 477 | mutex_unlock(&desc->lock); |
afba937e ON |
478 | return rv; |
479 | } | |
480 | ||
481 | static int wdm_flush(struct file *file, fl_owner_t id) | |
482 | { | |
483 | struct wdm_device *desc = file->private_data; | |
484 | ||
485 | wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); | |
486 | if (desc->werr < 0) | |
9908a32e GKH |
487 | dev_err(&desc->intf->dev, "Error in flush path: %d\n", |
488 | desc->werr); | |
afba937e ON |
489 | |
490 | return desc->werr; | |
491 | } | |
492 | ||
493 | static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) | |
494 | { | |
495 | struct wdm_device *desc = file->private_data; | |
496 | unsigned long flags; | |
497 | unsigned int mask = 0; | |
498 | ||
499 | spin_lock_irqsave(&desc->iuspin, flags); | |
500 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
501 | mask = POLLERR; | |
502 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
503 | goto desc_out; | |
504 | } | |
505 | if (test_bit(WDM_READ, &desc->flags)) | |
506 | mask = POLLIN | POLLRDNORM; | |
507 | if (desc->rerr || desc->werr) | |
508 | mask |= POLLERR; | |
509 | if (!test_bit(WDM_IN_USE, &desc->flags)) | |
510 | mask |= POLLOUT | POLLWRNORM; | |
511 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
512 | ||
513 | poll_wait(file, &desc->wait, wait); | |
514 | ||
515 | desc_out: | |
516 | return mask; | |
517 | } | |
518 | ||
519 | static int wdm_open(struct inode *inode, struct file *file) | |
520 | { | |
521 | int minor = iminor(inode); | |
522 | int rv = -ENODEV; | |
523 | struct usb_interface *intf; | |
524 | struct wdm_device *desc; | |
525 | ||
526 | mutex_lock(&wdm_mutex); | |
527 | intf = usb_find_interface(&wdm_driver, minor); | |
528 | if (!intf) | |
529 | goto out; | |
530 | ||
531 | desc = usb_get_intfdata(intf); | |
532 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) | |
533 | goto out; | |
afba937e ON |
534 | file->private_data = desc; |
535 | ||
17d80d56 | 536 | rv = usb_autopm_get_interface(desc->intf); |
afba937e | 537 | if (rv < 0) { |
9908a32e | 538 | dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); |
afba937e ON |
539 | goto out; |
540 | } | |
17d80d56 | 541 | intf->needs_remote_wakeup = 1; |
afba937e | 542 | |
860e41a7 | 543 | mutex_lock(&desc->lock); |
17d80d56 ON |
544 | if (!desc->count++) { |
545 | rv = usb_submit_urb(desc->validity, GFP_KERNEL); | |
546 | if (rv < 0) { | |
547 | desc->count--; | |
9908a32e GKH |
548 | dev_err(&desc->intf->dev, |
549 | "Error submitting int urb - %d\n", rv); | |
17d80d56 ON |
550 | } |
551 | } else { | |
552 | rv = 0; | |
553 | } | |
860e41a7 | 554 | mutex_unlock(&desc->lock); |
17d80d56 | 555 | usb_autopm_put_interface(desc->intf); |
afba937e ON |
556 | out: |
557 | mutex_unlock(&wdm_mutex); | |
558 | return rv; | |
559 | } | |
560 | ||
561 | static int wdm_release(struct inode *inode, struct file *file) | |
562 | { | |
563 | struct wdm_device *desc = file->private_data; | |
564 | ||
565 | mutex_lock(&wdm_mutex); | |
860e41a7 | 566 | mutex_lock(&desc->lock); |
afba937e | 567 | desc->count--; |
860e41a7 | 568 | mutex_unlock(&desc->lock); |
17d80d56 | 569 | |
afba937e ON |
570 | if (!desc->count) { |
571 | dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); | |
572 | kill_urbs(desc); | |
17d80d56 ON |
573 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
574 | desc->intf->needs_remote_wakeup = 0; | |
afba937e ON |
575 | } |
576 | mutex_unlock(&wdm_mutex); | |
577 | return 0; | |
578 | } | |
579 | ||
580 | static const struct file_operations wdm_fops = { | |
581 | .owner = THIS_MODULE, | |
582 | .read = wdm_read, | |
583 | .write = wdm_write, | |
584 | .open = wdm_open, | |
585 | .flush = wdm_flush, | |
586 | .release = wdm_release, | |
587 | .poll = wdm_poll | |
588 | }; | |
589 | ||
590 | static struct usb_class_driver wdm_class = { | |
591 | .name = "cdc-wdm%d", | |
592 | .fops = &wdm_fops, | |
593 | .minor_base = WDM_MINOR_BASE, | |
594 | }; | |
595 | ||
596 | /* --- error handling --- */ | |
597 | static void wdm_rxwork(struct work_struct *work) | |
598 | { | |
599 | struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); | |
600 | unsigned long flags; | |
601 | int rv; | |
602 | ||
603 | spin_lock_irqsave(&desc->iuspin, flags); | |
604 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
605 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
606 | } else { | |
607 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
608 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
609 | if (rv < 0 && rv != -EPERM) { | |
610 | spin_lock_irqsave(&desc->iuspin, flags); | |
611 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) | |
612 | schedule_work(&desc->rxwork); | |
613 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
614 | } | |
615 | } | |
616 | } | |
617 | ||
618 | /* --- hotplug --- */ | |
619 | ||
620 | static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
621 | { | |
622 | int rv = -EINVAL; | |
623 | struct usb_device *udev = interface_to_usbdev(intf); | |
624 | struct wdm_device *desc; | |
625 | struct usb_host_interface *iface; | |
626 | struct usb_endpoint_descriptor *ep; | |
627 | struct usb_cdc_dmm_desc *dmhd; | |
628 | u8 *buffer = intf->altsetting->extra; | |
629 | int buflen = intf->altsetting->extralen; | |
630 | u16 maxcom = 0; | |
631 | ||
632 | if (!buffer) | |
633 | goto out; | |
634 | ||
052fbc0d | 635 | while (buflen > 2) { |
afba937e | 636 | if (buffer [1] != USB_DT_CS_INTERFACE) { |
9908a32e | 637 | dev_err(&intf->dev, "skipping garbage\n"); |
afba937e ON |
638 | goto next_desc; |
639 | } | |
640 | ||
641 | switch (buffer [2]) { | |
642 | case USB_CDC_HEADER_TYPE: | |
643 | break; | |
644 | case USB_CDC_DMM_TYPE: | |
645 | dmhd = (struct usb_cdc_dmm_desc *)buffer; | |
646 | maxcom = le16_to_cpu(dmhd->wMaxCommand); | |
647 | dev_dbg(&intf->dev, | |
648 | "Finding maximum buffer length: %d", maxcom); | |
649 | break; | |
650 | default: | |
9908a32e GKH |
651 | dev_err(&intf->dev, |
652 | "Ignoring extra header, type %d, length %d\n", | |
afba937e ON |
653 | buffer[2], buffer[0]); |
654 | break; | |
655 | } | |
656 | next_desc: | |
657 | buflen -= buffer[0]; | |
658 | buffer += buffer[0]; | |
659 | } | |
660 | ||
661 | rv = -ENOMEM; | |
662 | desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); | |
663 | if (!desc) | |
664 | goto out; | |
860e41a7 | 665 | mutex_init(&desc->lock); |
afba937e ON |
666 | spin_lock_init(&desc->iuspin); |
667 | init_waitqueue_head(&desc->wait); | |
668 | desc->wMaxCommand = maxcom; | |
052fbc0d | 669 | /* this will be expanded and needed in hardware endianness */ |
afba937e ON |
670 | desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); |
671 | desc->intf = intf; | |
672 | INIT_WORK(&desc->rxwork, wdm_rxwork); | |
673 | ||
052fbc0d ON |
674 | rv = -EINVAL; |
675 | iface = intf->cur_altsetting; | |
676 | if (iface->desc.bNumEndpoints != 1) | |
677 | goto err; | |
afba937e | 678 | ep = &iface->endpoint[0].desc; |
052fbc0d | 679 | if (!ep || !usb_endpoint_is_int_in(ep)) |
afba937e | 680 | goto err; |
afba937e | 681 | |
fa4144b7 AV |
682 | desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize); |
683 | desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0; | |
afba937e ON |
684 | |
685 | desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
686 | if (!desc->orq) | |
687 | goto err; | |
688 | desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
689 | if (!desc->irq) | |
690 | goto err; | |
691 | ||
692 | desc->validity = usb_alloc_urb(0, GFP_KERNEL); | |
693 | if (!desc->validity) | |
694 | goto err; | |
695 | ||
696 | desc->response = usb_alloc_urb(0, GFP_KERNEL); | |
697 | if (!desc->response) | |
698 | goto err; | |
699 | ||
700 | desc->command = usb_alloc_urb(0, GFP_KERNEL); | |
701 | if (!desc->command) | |
702 | goto err; | |
703 | ||
704 | desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); | |
705 | if (!desc->ubuf) | |
706 | goto err; | |
707 | ||
708 | desc->sbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
709 | desc->wMaxPacketSize, | |
710 | GFP_KERNEL, | |
711 | &desc->validity->transfer_dma); | |
712 | if (!desc->sbuf) | |
713 | goto err; | |
714 | ||
715 | desc->inbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
716 | desc->bMaxPacketSize0, | |
717 | GFP_KERNEL, | |
718 | &desc->response->transfer_dma); | |
719 | if (!desc->inbuf) | |
720 | goto err2; | |
721 | ||
722 | usb_fill_int_urb( | |
723 | desc->validity, | |
724 | interface_to_usbdev(intf), | |
725 | usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), | |
726 | desc->sbuf, | |
727 | desc->wMaxPacketSize, | |
728 | wdm_int_callback, | |
729 | desc, | |
730 | ep->bInterval | |
731 | ); | |
732 | desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
733 | ||
734 | usb_set_intfdata(intf, desc); | |
735 | rv = usb_register_dev(intf, &wdm_class); | |
afba937e | 736 | if (rv < 0) |
052fbc0d ON |
737 | goto err3; |
738 | else | |
739 | dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n", | |
740 | intf->minor - WDM_MINOR_BASE); | |
afba937e ON |
741 | out: |
742 | return rv; | |
052fbc0d ON |
743 | err3: |
744 | usb_set_intfdata(intf, NULL); | |
745 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
746 | desc->bMaxPacketSize0, | |
747 | desc->inbuf, | |
748 | desc->response->transfer_dma); | |
afba937e ON |
749 | err2: |
750 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
751 | desc->wMaxPacketSize, | |
752 | desc->sbuf, | |
753 | desc->validity->transfer_dma); | |
754 | err: | |
755 | free_urbs(desc); | |
756 | kfree(desc->ubuf); | |
757 | kfree(desc->orq); | |
758 | kfree(desc->irq); | |
759 | kfree(desc); | |
760 | return rv; | |
761 | } | |
762 | ||
763 | static void wdm_disconnect(struct usb_interface *intf) | |
764 | { | |
765 | struct wdm_device *desc; | |
766 | unsigned long flags; | |
767 | ||
768 | usb_deregister_dev(intf, &wdm_class); | |
769 | mutex_lock(&wdm_mutex); | |
770 | desc = usb_get_intfdata(intf); | |
771 | ||
772 | /* the spinlock makes sure no new urbs are generated in the callbacks */ | |
773 | spin_lock_irqsave(&desc->iuspin, flags); | |
774 | set_bit(WDM_DISCONNECTING, &desc->flags); | |
775 | set_bit(WDM_READ, &desc->flags); | |
17d80d56 | 776 | /* to terminate pending flushes */ |
afba937e ON |
777 | clear_bit(WDM_IN_USE, &desc->flags); |
778 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
860e41a7 | 779 | mutex_lock(&desc->lock); |
afba937e | 780 | kill_urbs(desc); |
d93d16e9 | 781 | cancel_work_sync(&desc->rxwork); |
860e41a7 | 782 | mutex_unlock(&desc->lock); |
afba937e ON |
783 | wake_up_all(&desc->wait); |
784 | if (!desc->count) | |
785 | cleanup(desc); | |
786 | mutex_unlock(&wdm_mutex); | |
787 | } | |
788 | ||
d93d16e9 | 789 | #ifdef CONFIG_PM |
17d80d56 ON |
790 | static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
791 | { | |
792 | struct wdm_device *desc = usb_get_intfdata(intf); | |
793 | int rv = 0; | |
794 | ||
795 | dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); | |
796 | ||
d93d16e9 ON |
797 | /* if this is an autosuspend the caller does the locking */ |
798 | if (!(message.event & PM_EVENT_AUTO)) | |
799 | mutex_lock(&desc->lock); | |
62e66854 | 800 | spin_lock_irq(&desc->iuspin); |
d93d16e9 | 801 | |
65bfd296 | 802 | if ((message.event & PM_EVENT_AUTO) && |
922a5ead ON |
803 | (test_bit(WDM_IN_USE, &desc->flags) |
804 | || test_bit(WDM_RESPONDING, &desc->flags))) { | |
62e66854 | 805 | spin_unlock_irq(&desc->iuspin); |
17d80d56 ON |
806 | rv = -EBUSY; |
807 | } else { | |
d93d16e9 | 808 | |
beb1d35f | 809 | set_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 810 | spin_unlock_irq(&desc->iuspin); |
d93d16e9 | 811 | /* callback submits work - order is essential */ |
17d80d56 | 812 | kill_urbs(desc); |
d93d16e9 | 813 | cancel_work_sync(&desc->rxwork); |
17d80d56 | 814 | } |
d93d16e9 ON |
815 | if (!(message.event & PM_EVENT_AUTO)) |
816 | mutex_unlock(&desc->lock); | |
17d80d56 ON |
817 | |
818 | return rv; | |
819 | } | |
d93d16e9 | 820 | #endif |
17d80d56 ON |
821 | |
822 | static int recover_from_urb_loss(struct wdm_device *desc) | |
823 | { | |
824 | int rv = 0; | |
825 | ||
826 | if (desc->count) { | |
827 | rv = usb_submit_urb(desc->validity, GFP_NOIO); | |
828 | if (rv < 0) | |
9908a32e GKH |
829 | dev_err(&desc->intf->dev, |
830 | "Error resume submitting int urb - %d\n", rv); | |
17d80d56 ON |
831 | } |
832 | return rv; | |
833 | } | |
d93d16e9 ON |
834 | |
835 | #ifdef CONFIG_PM | |
17d80d56 ON |
836 | static int wdm_resume(struct usb_interface *intf) |
837 | { | |
838 | struct wdm_device *desc = usb_get_intfdata(intf); | |
839 | int rv; | |
840 | ||
841 | dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); | |
338124c1 | 842 | |
beb1d35f | 843 | clear_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 844 | rv = recover_from_urb_loss(desc); |
338124c1 | 845 | |
17d80d56 ON |
846 | return rv; |
847 | } | |
d93d16e9 | 848 | #endif |
17d80d56 ON |
849 | |
850 | static int wdm_pre_reset(struct usb_interface *intf) | |
851 | { | |
852 | struct wdm_device *desc = usb_get_intfdata(intf); | |
853 | ||
860e41a7 | 854 | mutex_lock(&desc->lock); |
17d80d56 ON |
855 | return 0; |
856 | } | |
857 | ||
858 | static int wdm_post_reset(struct usb_interface *intf) | |
859 | { | |
860 | struct wdm_device *desc = usb_get_intfdata(intf); | |
861 | int rv; | |
862 | ||
863 | rv = recover_from_urb_loss(desc); | |
860e41a7 | 864 | mutex_unlock(&desc->lock); |
17d80d56 ON |
865 | return 0; |
866 | } | |
867 | ||
afba937e ON |
868 | static struct usb_driver wdm_driver = { |
869 | .name = "cdc_wdm", | |
870 | .probe = wdm_probe, | |
871 | .disconnect = wdm_disconnect, | |
d93d16e9 | 872 | #ifdef CONFIG_PM |
17d80d56 ON |
873 | .suspend = wdm_suspend, |
874 | .resume = wdm_resume, | |
875 | .reset_resume = wdm_resume, | |
d93d16e9 | 876 | #endif |
17d80d56 ON |
877 | .pre_reset = wdm_pre_reset, |
878 | .post_reset = wdm_post_reset, | |
afba937e | 879 | .id_table = wdm_ids, |
17d80d56 | 880 | .supports_autosuspend = 1, |
afba937e ON |
881 | }; |
882 | ||
883 | /* --- low level module stuff --- */ | |
884 | ||
885 | static int __init wdm_init(void) | |
886 | { | |
887 | int rv; | |
888 | ||
889 | rv = usb_register(&wdm_driver); | |
890 | ||
891 | return rv; | |
892 | } | |
893 | ||
894 | static void __exit wdm_exit(void) | |
895 | { | |
896 | usb_deregister(&wdm_driver); | |
897 | } | |
898 | ||
899 | module_init(wdm_init); | |
900 | module_exit(wdm_exit); | |
901 | ||
902 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
87d65e54 | 903 | MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e | 904 | MODULE_LICENSE("GPL"); |