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afba937e ON |
1 | /* |
2 | * cdc-wdm.c | |
3 | * | |
4 | * This driver supports USB CDC WCM Device Management. | |
5 | * | |
6 | * Copyright (c) 2007-2008 Oliver Neukum | |
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> | |
18 | #include <linux/smp_lock.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/uaccess.h> | |
21 | #include <linux/bitops.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/usb.h> | |
24 | #include <linux/usb/cdc.h> | |
25 | #include <asm/byteorder.h> | |
26 | #include <asm/unaligned.h> | |
27 | ||
28 | /* | |
29 | * Version Information | |
30 | */ | |
87d65e54 | 31 | #define DRIVER_VERSION "v0.03" |
afba937e | 32 | #define DRIVER_AUTHOR "Oliver Neukum" |
87d65e54 | 33 | #define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management" |
afba937e ON |
34 | |
35 | static struct usb_device_id wdm_ids[] = { | |
36 | { | |
37 | .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS | | |
38 | USB_DEVICE_ID_MATCH_INT_SUBCLASS, | |
39 | .bInterfaceClass = USB_CLASS_COMM, | |
40 | .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM | |
41 | }, | |
42 | { } | |
43 | }; | |
44 | ||
45 | #define WDM_MINOR_BASE 176 | |
46 | ||
47 | ||
48 | #define WDM_IN_USE 1 | |
49 | #define WDM_DISCONNECTING 2 | |
50 | #define WDM_RESULT 3 | |
51 | #define WDM_READ 4 | |
52 | #define WDM_INT_STALL 5 | |
53 | #define WDM_POLL_RUNNING 6 | |
54 | ||
55 | ||
56 | #define WDM_MAX 16 | |
57 | ||
58 | ||
59 | static DEFINE_MUTEX(wdm_mutex); | |
60 | ||
61 | /* --- method tables --- */ | |
62 | ||
63 | struct wdm_device { | |
64 | u8 *inbuf; /* buffer for response */ | |
65 | u8 *outbuf; /* buffer for command */ | |
66 | u8 *sbuf; /* buffer for status */ | |
67 | u8 *ubuf; /* buffer for copy to user space */ | |
68 | ||
69 | struct urb *command; | |
70 | struct urb *response; | |
71 | struct urb *validity; | |
72 | struct usb_interface *intf; | |
73 | struct usb_ctrlrequest *orq; | |
74 | struct usb_ctrlrequest *irq; | |
75 | spinlock_t iuspin; | |
76 | ||
77 | unsigned long flags; | |
78 | u16 bufsize; | |
79 | u16 wMaxCommand; | |
80 | u16 wMaxPacketSize; | |
81 | u16 bMaxPacketSize0; | |
82 | __le16 inum; | |
83 | int reslength; | |
84 | int length; | |
85 | int read; | |
86 | int count; | |
87 | dma_addr_t shandle; | |
88 | dma_addr_t ihandle; | |
89 | struct mutex wlock; | |
90 | struct mutex rlock; | |
17d80d56 | 91 | struct mutex plock; |
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); | |
119 | ||
120 | if (status) { | |
121 | switch (status) { | |
122 | case -ENOENT: | |
123 | dev_dbg(&desc->intf->dev, | |
124 | "nonzero urb status received: -ENOENT"); | |
125 | break; | |
126 | case -ECONNRESET: | |
127 | dev_dbg(&desc->intf->dev, | |
128 | "nonzero urb status received: -ECONNRESET"); | |
129 | break; | |
130 | case -ESHUTDOWN: | |
131 | dev_dbg(&desc->intf->dev, | |
132 | "nonzero urb status received: -ESHUTDOWN"); | |
133 | break; | |
134 | case -EPIPE: | |
135 | err("nonzero urb status received: -EPIPE"); | |
136 | break; | |
137 | default: | |
138 | err("Unexpected error %d", status); | |
139 | break; | |
140 | } | |
141 | } | |
142 | ||
143 | desc->rerr = status; | |
144 | desc->reslength = urb->actual_length; | |
145 | memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength); | |
146 | desc->length += desc->reslength; | |
147 | wake_up(&desc->wait); | |
148 | ||
149 | set_bit(WDM_READ, &desc->flags); | |
150 | spin_unlock(&desc->iuspin); | |
151 | } | |
152 | ||
153 | static void wdm_int_callback(struct urb *urb) | |
154 | { | |
155 | int rv = 0; | |
156 | int status = urb->status; | |
157 | struct wdm_device *desc; | |
158 | struct usb_ctrlrequest *req; | |
159 | struct usb_cdc_notification *dr; | |
160 | ||
161 | desc = urb->context; | |
162 | req = desc->irq; | |
163 | dr = (struct usb_cdc_notification *)desc->sbuf; | |
164 | ||
165 | if (status) { | |
166 | switch (status) { | |
167 | case -ESHUTDOWN: | |
168 | case -ENOENT: | |
169 | case -ECONNRESET: | |
170 | return; /* unplug */ | |
171 | case -EPIPE: | |
172 | set_bit(WDM_INT_STALL, &desc->flags); | |
173 | err("Stall on int endpoint"); | |
174 | goto sw; /* halt is cleared in work */ | |
175 | default: | |
176 | err("nonzero urb status received: %d", status); | |
177 | break; | |
178 | } | |
179 | } | |
180 | ||
181 | if (urb->actual_length < sizeof(struct usb_cdc_notification)) { | |
182 | err("wdm_int_callback - %d bytes", urb->actual_length); | |
183 | goto exit; | |
184 | } | |
185 | ||
186 | switch (dr->bNotificationType) { | |
187 | case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: | |
188 | dev_dbg(&desc->intf->dev, | |
189 | "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d", | |
190 | dr->wIndex, dr->wLength); | |
191 | break; | |
192 | ||
193 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
194 | ||
195 | dev_dbg(&desc->intf->dev, | |
196 | "NOTIFY_NETWORK_CONNECTION %s network", | |
197 | dr->wValue ? "connected to" : "disconnected from"); | |
198 | goto exit; | |
199 | default: | |
200 | clear_bit(WDM_POLL_RUNNING, &desc->flags); | |
201 | err("unknown notification %d received: index %d len %d", | |
202 | dr->bNotificationType, dr->wIndex, dr->wLength); | |
203 | goto exit; | |
204 | } | |
205 | ||
206 | req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); | |
207 | req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; | |
208 | req->wValue = 0; | |
209 | req->wIndex = desc->inum; | |
87d65e54 | 210 | req->wLength = cpu_to_le16(desc->wMaxCommand); |
afba937e ON |
211 | |
212 | usb_fill_control_urb( | |
213 | desc->response, | |
214 | interface_to_usbdev(desc->intf), | |
215 | /* using common endpoint 0 */ | |
216 | usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), | |
217 | (unsigned char *)req, | |
218 | desc->inbuf, | |
87d65e54 | 219 | desc->wMaxCommand, |
afba937e ON |
220 | wdm_in_callback, |
221 | desc | |
222 | ); | |
223 | desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
224 | spin_lock(&desc->iuspin); | |
225 | clear_bit(WDM_READ, &desc->flags); | |
226 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
227 | rv = usb_submit_urb(desc->response, GFP_ATOMIC); | |
228 | dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d", | |
229 | __func__, rv); | |
230 | } | |
231 | spin_unlock(&desc->iuspin); | |
232 | if (rv < 0) { | |
233 | if (rv == -EPERM) | |
234 | return; | |
235 | if (rv == -ENOMEM) { | |
236 | sw: | |
237 | rv = schedule_work(&desc->rxwork); | |
238 | if (rv) | |
239 | err("Cannot schedule work"); | |
240 | } | |
241 | } | |
242 | exit: | |
243 | rv = usb_submit_urb(urb, GFP_ATOMIC); | |
244 | if (rv) | |
245 | err("%s - usb_submit_urb failed with result %d", | |
246 | __func__, rv); | |
247 | ||
248 | } | |
249 | ||
250 | static void kill_urbs(struct wdm_device *desc) | |
251 | { | |
17d80d56 | 252 | /* the order here is essential */ |
afba937e ON |
253 | usb_kill_urb(desc->command); |
254 | usb_kill_urb(desc->validity); | |
255 | usb_kill_urb(desc->response); | |
256 | } | |
257 | ||
258 | static void free_urbs(struct wdm_device *desc) | |
259 | { | |
260 | usb_free_urb(desc->validity); | |
261 | usb_free_urb(desc->response); | |
262 | usb_free_urb(desc->command); | |
263 | } | |
264 | ||
265 | static void cleanup(struct wdm_device *desc) | |
266 | { | |
267 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
268 | desc->wMaxPacketSize, | |
269 | desc->sbuf, | |
270 | desc->validity->transfer_dma); | |
271 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
87d65e54 | 272 | desc->wMaxCommand, |
afba937e ON |
273 | desc->inbuf, |
274 | desc->response->transfer_dma); | |
275 | kfree(desc->orq); | |
276 | kfree(desc->irq); | |
277 | kfree(desc->ubuf); | |
278 | free_urbs(desc); | |
279 | kfree(desc); | |
280 | } | |
281 | ||
282 | static ssize_t wdm_write | |
283 | (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
284 | { | |
285 | u8 *buf; | |
286 | int rv = -EMSGSIZE, r, we; | |
287 | struct wdm_device *desc = file->private_data; | |
288 | struct usb_ctrlrequest *req; | |
289 | ||
290 | if (count > desc->wMaxCommand) | |
291 | count = desc->wMaxCommand; | |
292 | ||
293 | spin_lock_irq(&desc->iuspin); | |
294 | we = desc->werr; | |
295 | desc->werr = 0; | |
296 | spin_unlock_irq(&desc->iuspin); | |
297 | if (we < 0) | |
298 | return -EIO; | |
299 | ||
300 | r = mutex_lock_interruptible(&desc->wlock); /* concurrent writes */ | |
301 | rv = -ERESTARTSYS; | |
302 | if (r) | |
303 | goto outnl; | |
304 | ||
17d80d56 ON |
305 | r = usb_autopm_get_interface(desc->intf); |
306 | if (r < 0) | |
307 | goto outnp; | |
afba937e ON |
308 | r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, |
309 | &desc->flags)); | |
310 | if (r < 0) | |
311 | goto out; | |
312 | ||
313 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
314 | rv = -ENODEV; | |
315 | goto out; | |
316 | } | |
317 | ||
318 | desc->outbuf = buf = kmalloc(count, GFP_KERNEL); | |
319 | if (!buf) { | |
320 | rv = -ENOMEM; | |
321 | goto out; | |
322 | } | |
323 | ||
324 | r = copy_from_user(buf, buffer, count); | |
325 | if (r > 0) { | |
326 | kfree(buf); | |
327 | rv = -EFAULT; | |
328 | goto out; | |
329 | } | |
330 | ||
331 | req = desc->orq; | |
332 | usb_fill_control_urb( | |
333 | desc->command, | |
334 | interface_to_usbdev(desc->intf), | |
335 | /* using common endpoint 0 */ | |
336 | usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), | |
337 | (unsigned char *)req, | |
338 | buf, | |
339 | count, | |
340 | wdm_out_callback, | |
341 | desc | |
342 | ); | |
343 | ||
344 | req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | | |
345 | USB_RECIP_INTERFACE); | |
346 | req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; | |
347 | req->wValue = 0; | |
348 | req->wIndex = desc->inum; | |
349 | req->wLength = cpu_to_le16(count); | |
350 | set_bit(WDM_IN_USE, &desc->flags); | |
351 | ||
352 | rv = usb_submit_urb(desc->command, GFP_KERNEL); | |
353 | if (rv < 0) { | |
354 | kfree(buf); | |
355 | clear_bit(WDM_IN_USE, &desc->flags); | |
87d65e54 | 356 | err("Tx URB error: %d", rv); |
afba937e ON |
357 | } else { |
358 | dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", | |
359 | req->wIndex); | |
360 | } | |
361 | out: | |
17d80d56 ON |
362 | usb_autopm_put_interface(desc->intf); |
363 | outnp: | |
afba937e ON |
364 | mutex_unlock(&desc->wlock); |
365 | outnl: | |
366 | return rv < 0 ? rv : count; | |
367 | } | |
368 | ||
369 | static ssize_t wdm_read | |
370 | (struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
371 | { | |
372 | int rv, cntr; | |
373 | int i = 0; | |
374 | struct wdm_device *desc = file->private_data; | |
375 | ||
376 | ||
377 | rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ | |
378 | if (rv < 0) | |
379 | return -ERESTARTSYS; | |
380 | ||
381 | if (desc->length == 0) { | |
382 | desc->read = 0; | |
383 | retry: | |
384 | i++; | |
385 | rv = wait_event_interruptible(desc->wait, | |
386 | test_bit(WDM_READ, &desc->flags)); | |
387 | ||
17d80d56 ON |
388 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
389 | rv = -ENODEV; | |
390 | goto err; | |
391 | } | |
392 | usb_mark_last_busy(interface_to_usbdev(desc->intf)); | |
afba937e ON |
393 | if (rv < 0) { |
394 | rv = -ERESTARTSYS; | |
395 | goto err; | |
396 | } | |
397 | ||
398 | spin_lock_irq(&desc->iuspin); | |
399 | ||
400 | if (desc->rerr) { /* read completed, error happened */ | |
401 | int t = desc->rerr; | |
402 | desc->rerr = 0; | |
403 | spin_unlock_irq(&desc->iuspin); | |
404 | err("reading had resulted in %d", t); | |
405 | rv = -EIO; | |
406 | goto err; | |
407 | } | |
408 | /* | |
409 | * recheck whether we've lost the race | |
410 | * against the completion handler | |
411 | */ | |
412 | if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ | |
413 | spin_unlock_irq(&desc->iuspin); | |
414 | goto retry; | |
415 | } | |
416 | if (!desc->reslength) { /* zero length read */ | |
417 | spin_unlock_irq(&desc->iuspin); | |
418 | goto retry; | |
419 | } | |
420 | clear_bit(WDM_READ, &desc->flags); | |
421 | spin_unlock_irq(&desc->iuspin); | |
422 | } | |
423 | ||
424 | cntr = count > desc->length ? desc->length : count; | |
425 | rv = copy_to_user(buffer, desc->ubuf, cntr); | |
426 | if (rv > 0) { | |
427 | rv = -EFAULT; | |
428 | goto err; | |
429 | } | |
430 | ||
431 | for (i = 0; i < desc->length - cntr; i++) | |
432 | desc->ubuf[i] = desc->ubuf[i + cntr]; | |
433 | ||
434 | desc->length -= cntr; | |
87d65e54 ON |
435 | /* in case we had outstanding data */ |
436 | if (!desc->length) | |
437 | clear_bit(WDM_READ, &desc->flags); | |
afba937e ON |
438 | rv = cntr; |
439 | ||
440 | err: | |
441 | mutex_unlock(&desc->rlock); | |
442 | if (rv < 0) | |
443 | err("wdm_read: exit error"); | |
444 | return rv; | |
445 | } | |
446 | ||
447 | static int wdm_flush(struct file *file, fl_owner_t id) | |
448 | { | |
449 | struct wdm_device *desc = file->private_data; | |
450 | ||
451 | wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); | |
452 | if (desc->werr < 0) | |
453 | err("Error in flush path: %d", desc->werr); | |
454 | ||
455 | return desc->werr; | |
456 | } | |
457 | ||
458 | static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) | |
459 | { | |
460 | struct wdm_device *desc = file->private_data; | |
461 | unsigned long flags; | |
462 | unsigned int mask = 0; | |
463 | ||
464 | spin_lock_irqsave(&desc->iuspin, flags); | |
465 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
466 | mask = POLLERR; | |
467 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
468 | goto desc_out; | |
469 | } | |
470 | if (test_bit(WDM_READ, &desc->flags)) | |
471 | mask = POLLIN | POLLRDNORM; | |
472 | if (desc->rerr || desc->werr) | |
473 | mask |= POLLERR; | |
474 | if (!test_bit(WDM_IN_USE, &desc->flags)) | |
475 | mask |= POLLOUT | POLLWRNORM; | |
476 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
477 | ||
478 | poll_wait(file, &desc->wait, wait); | |
479 | ||
480 | desc_out: | |
481 | return mask; | |
482 | } | |
483 | ||
484 | static int wdm_open(struct inode *inode, struct file *file) | |
485 | { | |
486 | int minor = iminor(inode); | |
487 | int rv = -ENODEV; | |
488 | struct usb_interface *intf; | |
489 | struct wdm_device *desc; | |
490 | ||
491 | mutex_lock(&wdm_mutex); | |
492 | intf = usb_find_interface(&wdm_driver, minor); | |
493 | if (!intf) | |
494 | goto out; | |
495 | ||
496 | desc = usb_get_intfdata(intf); | |
497 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) | |
498 | goto out; | |
499 | ||
17d80d56 | 500 | ; |
afba937e ON |
501 | file->private_data = desc; |
502 | ||
17d80d56 | 503 | rv = usb_autopm_get_interface(desc->intf); |
afba937e | 504 | if (rv < 0) { |
17d80d56 | 505 | err("Error autopm - %d", rv); |
afba937e ON |
506 | goto out; |
507 | } | |
17d80d56 | 508 | intf->needs_remote_wakeup = 1; |
afba937e | 509 | |
17d80d56 ON |
510 | mutex_lock(&desc->plock); |
511 | if (!desc->count++) { | |
512 | rv = usb_submit_urb(desc->validity, GFP_KERNEL); | |
513 | if (rv < 0) { | |
514 | desc->count--; | |
515 | err("Error submitting int urb - %d", rv); | |
516 | } | |
517 | } else { | |
518 | rv = 0; | |
519 | } | |
520 | mutex_unlock(&desc->plock); | |
521 | usb_autopm_put_interface(desc->intf); | |
afba937e ON |
522 | out: |
523 | mutex_unlock(&wdm_mutex); | |
524 | return rv; | |
525 | } | |
526 | ||
527 | static int wdm_release(struct inode *inode, struct file *file) | |
528 | { | |
529 | struct wdm_device *desc = file->private_data; | |
530 | ||
531 | mutex_lock(&wdm_mutex); | |
17d80d56 | 532 | mutex_lock(&desc->plock); |
afba937e | 533 | desc->count--; |
17d80d56 ON |
534 | mutex_unlock(&desc->plock); |
535 | ||
afba937e ON |
536 | if (!desc->count) { |
537 | dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); | |
538 | kill_urbs(desc); | |
17d80d56 ON |
539 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
540 | desc->intf->needs_remote_wakeup = 0; | |
afba937e ON |
541 | } |
542 | mutex_unlock(&wdm_mutex); | |
543 | return 0; | |
544 | } | |
545 | ||
546 | static const struct file_operations wdm_fops = { | |
547 | .owner = THIS_MODULE, | |
548 | .read = wdm_read, | |
549 | .write = wdm_write, | |
550 | .open = wdm_open, | |
551 | .flush = wdm_flush, | |
552 | .release = wdm_release, | |
553 | .poll = wdm_poll | |
554 | }; | |
555 | ||
556 | static struct usb_class_driver wdm_class = { | |
557 | .name = "cdc-wdm%d", | |
558 | .fops = &wdm_fops, | |
559 | .minor_base = WDM_MINOR_BASE, | |
560 | }; | |
561 | ||
562 | /* --- error handling --- */ | |
563 | static void wdm_rxwork(struct work_struct *work) | |
564 | { | |
565 | struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); | |
566 | unsigned long flags; | |
567 | int rv; | |
568 | ||
569 | spin_lock_irqsave(&desc->iuspin, flags); | |
570 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
571 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
572 | } else { | |
573 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
574 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
575 | if (rv < 0 && rv != -EPERM) { | |
576 | spin_lock_irqsave(&desc->iuspin, flags); | |
577 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) | |
578 | schedule_work(&desc->rxwork); | |
579 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
580 | } | |
581 | } | |
582 | } | |
583 | ||
584 | /* --- hotplug --- */ | |
585 | ||
586 | static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
587 | { | |
588 | int rv = -EINVAL; | |
589 | struct usb_device *udev = interface_to_usbdev(intf); | |
590 | struct wdm_device *desc; | |
591 | struct usb_host_interface *iface; | |
592 | struct usb_endpoint_descriptor *ep; | |
593 | struct usb_cdc_dmm_desc *dmhd; | |
594 | u8 *buffer = intf->altsetting->extra; | |
595 | int buflen = intf->altsetting->extralen; | |
596 | u16 maxcom = 0; | |
597 | ||
598 | if (!buffer) | |
599 | goto out; | |
600 | ||
601 | while (buflen > 0) { | |
602 | if (buffer [1] != USB_DT_CS_INTERFACE) { | |
603 | err("skipping garbage"); | |
604 | goto next_desc; | |
605 | } | |
606 | ||
607 | switch (buffer [2]) { | |
608 | case USB_CDC_HEADER_TYPE: | |
609 | break; | |
610 | case USB_CDC_DMM_TYPE: | |
611 | dmhd = (struct usb_cdc_dmm_desc *)buffer; | |
612 | maxcom = le16_to_cpu(dmhd->wMaxCommand); | |
613 | dev_dbg(&intf->dev, | |
614 | "Finding maximum buffer length: %d", maxcom); | |
615 | break; | |
616 | default: | |
617 | err("Ignoring extra header, type %d, length %d", | |
618 | buffer[2], buffer[0]); | |
619 | break; | |
620 | } | |
621 | next_desc: | |
622 | buflen -= buffer[0]; | |
623 | buffer += buffer[0]; | |
624 | } | |
625 | ||
626 | rv = -ENOMEM; | |
627 | desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); | |
628 | if (!desc) | |
629 | goto out; | |
630 | mutex_init(&desc->wlock); | |
631 | mutex_init(&desc->rlock); | |
17d80d56 | 632 | mutex_init(&desc->plock); |
afba937e ON |
633 | spin_lock_init(&desc->iuspin); |
634 | init_waitqueue_head(&desc->wait); | |
635 | desc->wMaxCommand = maxcom; | |
636 | desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); | |
637 | desc->intf = intf; | |
638 | INIT_WORK(&desc->rxwork, wdm_rxwork); | |
639 | ||
640 | iface = &intf->altsetting[0]; | |
641 | ep = &iface->endpoint[0].desc; | |
642 | if (!usb_endpoint_is_int_in(ep)) { | |
643 | rv = -EINVAL; | |
644 | goto err; | |
645 | } | |
646 | ||
fa4144b7 AV |
647 | desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize); |
648 | desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0; | |
afba937e ON |
649 | |
650 | desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
651 | if (!desc->orq) | |
652 | goto err; | |
653 | desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
654 | if (!desc->irq) | |
655 | goto err; | |
656 | ||
657 | desc->validity = usb_alloc_urb(0, GFP_KERNEL); | |
658 | if (!desc->validity) | |
659 | goto err; | |
660 | ||
661 | desc->response = usb_alloc_urb(0, GFP_KERNEL); | |
662 | if (!desc->response) | |
663 | goto err; | |
664 | ||
665 | desc->command = usb_alloc_urb(0, GFP_KERNEL); | |
666 | if (!desc->command) | |
667 | goto err; | |
668 | ||
669 | desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); | |
670 | if (!desc->ubuf) | |
671 | goto err; | |
672 | ||
673 | desc->sbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
674 | desc->wMaxPacketSize, | |
675 | GFP_KERNEL, | |
676 | &desc->validity->transfer_dma); | |
677 | if (!desc->sbuf) | |
678 | goto err; | |
679 | ||
680 | desc->inbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
681 | desc->bMaxPacketSize0, | |
682 | GFP_KERNEL, | |
683 | &desc->response->transfer_dma); | |
684 | if (!desc->inbuf) | |
685 | goto err2; | |
686 | ||
687 | usb_fill_int_urb( | |
688 | desc->validity, | |
689 | interface_to_usbdev(intf), | |
690 | usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), | |
691 | desc->sbuf, | |
692 | desc->wMaxPacketSize, | |
693 | wdm_int_callback, | |
694 | desc, | |
695 | ep->bInterval | |
696 | ); | |
697 | desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
698 | ||
699 | usb_set_intfdata(intf, desc); | |
700 | rv = usb_register_dev(intf, &wdm_class); | |
701 | dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n", | |
702 | intf->minor - WDM_MINOR_BASE); | |
703 | if (rv < 0) | |
704 | goto err; | |
705 | out: | |
706 | return rv; | |
707 | err2: | |
708 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
709 | desc->wMaxPacketSize, | |
710 | desc->sbuf, | |
711 | desc->validity->transfer_dma); | |
712 | err: | |
713 | free_urbs(desc); | |
714 | kfree(desc->ubuf); | |
715 | kfree(desc->orq); | |
716 | kfree(desc->irq); | |
717 | kfree(desc); | |
718 | return rv; | |
719 | } | |
720 | ||
721 | static void wdm_disconnect(struct usb_interface *intf) | |
722 | { | |
723 | struct wdm_device *desc; | |
724 | unsigned long flags; | |
725 | ||
726 | usb_deregister_dev(intf, &wdm_class); | |
727 | mutex_lock(&wdm_mutex); | |
728 | desc = usb_get_intfdata(intf); | |
729 | ||
730 | /* the spinlock makes sure no new urbs are generated in the callbacks */ | |
731 | spin_lock_irqsave(&desc->iuspin, flags); | |
732 | set_bit(WDM_DISCONNECTING, &desc->flags); | |
733 | set_bit(WDM_READ, &desc->flags); | |
17d80d56 | 734 | /* to terminate pending flushes */ |
afba937e ON |
735 | clear_bit(WDM_IN_USE, &desc->flags); |
736 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
737 | cancel_work_sync(&desc->rxwork); | |
738 | kill_urbs(desc); | |
739 | wake_up_all(&desc->wait); | |
740 | if (!desc->count) | |
741 | cleanup(desc); | |
742 | mutex_unlock(&wdm_mutex); | |
743 | } | |
744 | ||
17d80d56 ON |
745 | static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
746 | { | |
747 | struct wdm_device *desc = usb_get_intfdata(intf); | |
748 | int rv = 0; | |
749 | ||
750 | dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); | |
751 | ||
752 | mutex_lock(&desc->plock); | |
753 | if (interface_to_usbdev(desc->intf)->auto_pm && test_bit(WDM_IN_USE, &desc->flags)) { | |
754 | rv = -EBUSY; | |
755 | } else { | |
756 | cancel_work_sync(&desc->rxwork); | |
757 | kill_urbs(desc); | |
758 | } | |
759 | mutex_unlock(&desc->plock); | |
760 | ||
761 | return rv; | |
762 | } | |
763 | ||
764 | static int recover_from_urb_loss(struct wdm_device *desc) | |
765 | { | |
766 | int rv = 0; | |
767 | ||
768 | if (desc->count) { | |
769 | rv = usb_submit_urb(desc->validity, GFP_NOIO); | |
770 | if (rv < 0) | |
771 | err("Error resume submitting int urb - %d", rv); | |
772 | } | |
773 | return rv; | |
774 | } | |
775 | static int wdm_resume(struct usb_interface *intf) | |
776 | { | |
777 | struct wdm_device *desc = usb_get_intfdata(intf); | |
778 | int rv; | |
779 | ||
780 | dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); | |
781 | mutex_lock(&desc->plock); | |
782 | rv = recover_from_urb_loss(desc); | |
783 | mutex_unlock(&desc->plock); | |
784 | return rv; | |
785 | } | |
786 | ||
787 | static int wdm_pre_reset(struct usb_interface *intf) | |
788 | { | |
789 | struct wdm_device *desc = usb_get_intfdata(intf); | |
790 | ||
791 | mutex_lock(&desc->plock); | |
792 | return 0; | |
793 | } | |
794 | ||
795 | static int wdm_post_reset(struct usb_interface *intf) | |
796 | { | |
797 | struct wdm_device *desc = usb_get_intfdata(intf); | |
798 | int rv; | |
799 | ||
800 | rv = recover_from_urb_loss(desc); | |
801 | mutex_unlock(&desc->plock); | |
802 | return 0; | |
803 | } | |
804 | ||
afba937e ON |
805 | static struct usb_driver wdm_driver = { |
806 | .name = "cdc_wdm", | |
807 | .probe = wdm_probe, | |
808 | .disconnect = wdm_disconnect, | |
17d80d56 ON |
809 | .suspend = wdm_suspend, |
810 | .resume = wdm_resume, | |
811 | .reset_resume = wdm_resume, | |
812 | .pre_reset = wdm_pre_reset, | |
813 | .post_reset = wdm_post_reset, | |
afba937e | 814 | .id_table = wdm_ids, |
17d80d56 | 815 | .supports_autosuspend = 1, |
afba937e ON |
816 | }; |
817 | ||
818 | /* --- low level module stuff --- */ | |
819 | ||
820 | static int __init wdm_init(void) | |
821 | { | |
822 | int rv; | |
823 | ||
824 | rv = usb_register(&wdm_driver); | |
825 | ||
826 | return rv; | |
827 | } | |
828 | ||
829 | static void __exit wdm_exit(void) | |
830 | { | |
831 | usb_deregister(&wdm_driver); | |
832 | } | |
833 | ||
834 | module_init(wdm_init); | |
835 | module_exit(wdm_exit); | |
836 | ||
837 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
87d65e54 | 838 | MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e | 839 | MODULE_LICENSE("GPL"); |