Commit | Line | Data |
---|---|---|
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 ON |
33 | |
34 | static struct usb_device_id wdm_ids[] = { | |
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 | |
55 | ||
56 | ||
57 | #define WDM_MAX 16 | |
58 | ||
59 | ||
60 | static DEFINE_MUTEX(wdm_mutex); | |
61 | ||
62 | /* --- method tables --- */ | |
63 | ||
64 | struct wdm_device { | |
65 | u8 *inbuf; /* buffer for response */ | |
66 | u8 *outbuf; /* buffer for command */ | |
67 | u8 *sbuf; /* buffer for status */ | |
68 | u8 *ubuf; /* buffer for copy to user space */ | |
69 | ||
70 | struct urb *command; | |
71 | struct urb *response; | |
72 | struct urb *validity; | |
73 | struct usb_interface *intf; | |
74 | struct usb_ctrlrequest *orq; | |
75 | struct usb_ctrlrequest *irq; | |
76 | spinlock_t iuspin; | |
77 | ||
78 | unsigned long flags; | |
79 | u16 bufsize; | |
80 | u16 wMaxCommand; | |
81 | u16 wMaxPacketSize; | |
82 | u16 bMaxPacketSize0; | |
83 | __le16 inum; | |
84 | int reslength; | |
85 | int length; | |
86 | int read; | |
87 | int count; | |
88 | dma_addr_t shandle; | |
89 | dma_addr_t ihandle; | |
90 | struct mutex wlock; | |
91 | struct mutex rlock; | |
17d80d56 | 92 | struct mutex plock; |
afba937e ON |
93 | wait_queue_head_t wait; |
94 | struct work_struct rxwork; | |
95 | int werr; | |
96 | int rerr; | |
97 | }; | |
98 | ||
99 | static struct usb_driver wdm_driver; | |
100 | ||
101 | /* --- callbacks --- */ | |
102 | static void wdm_out_callback(struct urb *urb) | |
103 | { | |
104 | struct wdm_device *desc; | |
105 | desc = urb->context; | |
106 | spin_lock(&desc->iuspin); | |
107 | desc->werr = urb->status; | |
108 | spin_unlock(&desc->iuspin); | |
109 | clear_bit(WDM_IN_USE, &desc->flags); | |
110 | kfree(desc->outbuf); | |
111 | wake_up(&desc->wait); | |
112 | } | |
113 | ||
114 | static void wdm_in_callback(struct urb *urb) | |
115 | { | |
116 | struct wdm_device *desc = urb->context; | |
117 | int status = urb->status; | |
118 | ||
119 | spin_lock(&desc->iuspin); | |
120 | ||
121 | if (status) { | |
122 | switch (status) { | |
123 | case -ENOENT: | |
124 | dev_dbg(&desc->intf->dev, | |
125 | "nonzero urb status received: -ENOENT"); | |
126 | break; | |
127 | case -ECONNRESET: | |
128 | dev_dbg(&desc->intf->dev, | |
129 | "nonzero urb status received: -ECONNRESET"); | |
130 | break; | |
131 | case -ESHUTDOWN: | |
132 | dev_dbg(&desc->intf->dev, | |
133 | "nonzero urb status received: -ESHUTDOWN"); | |
134 | break; | |
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; | |
150 | wake_up(&desc->wait); | |
151 | ||
152 | set_bit(WDM_READ, &desc->flags); | |
153 | spin_unlock(&desc->iuspin); | |
154 | } | |
155 | ||
156 | static void wdm_int_callback(struct urb *urb) | |
157 | { | |
158 | int rv = 0; | |
159 | int status = urb->status; | |
160 | struct wdm_device *desc; | |
161 | struct usb_ctrlrequest *req; | |
162 | struct usb_cdc_notification *dr; | |
163 | ||
164 | desc = urb->context; | |
165 | req = desc->irq; | |
166 | dr = (struct usb_cdc_notification *)desc->sbuf; | |
167 | ||
168 | if (status) { | |
169 | switch (status) { | |
170 | case -ESHUTDOWN: | |
171 | case -ENOENT: | |
172 | case -ECONNRESET: | |
173 | return; /* unplug */ | |
174 | case -EPIPE: | |
175 | set_bit(WDM_INT_STALL, &desc->flags); | |
9908a32e | 176 | dev_err(&desc->intf->dev, "Stall on int endpoint\n"); |
afba937e ON |
177 | goto sw; /* halt is cleared in work */ |
178 | default: | |
9908a32e GKH |
179 | dev_err(&desc->intf->dev, |
180 | "nonzero urb status received: %d\n", status); | |
afba937e ON |
181 | break; |
182 | } | |
183 | } | |
184 | ||
185 | if (urb->actual_length < sizeof(struct usb_cdc_notification)) { | |
9908a32e GKH |
186 | dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n", |
187 | urb->actual_length); | |
afba937e ON |
188 | goto exit; |
189 | } | |
190 | ||
191 | switch (dr->bNotificationType) { | |
192 | case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: | |
193 | dev_dbg(&desc->intf->dev, | |
194 | "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d", | |
195 | dr->wIndex, dr->wLength); | |
196 | break; | |
197 | ||
198 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
199 | ||
200 | dev_dbg(&desc->intf->dev, | |
201 | "NOTIFY_NETWORK_CONNECTION %s network", | |
202 | dr->wValue ? "connected to" : "disconnected from"); | |
203 | goto exit; | |
204 | default: | |
205 | clear_bit(WDM_POLL_RUNNING, &desc->flags); | |
9908a32e GKH |
206 | dev_err(&desc->intf->dev, |
207 | "unknown notification %d received: index %d len %d\n", | |
afba937e ON |
208 | dr->bNotificationType, dr->wIndex, dr->wLength); |
209 | goto exit; | |
210 | } | |
211 | ||
212 | req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); | |
213 | req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; | |
214 | req->wValue = 0; | |
215 | req->wIndex = desc->inum; | |
87d65e54 | 216 | req->wLength = cpu_to_le16(desc->wMaxCommand); |
afba937e ON |
217 | |
218 | usb_fill_control_urb( | |
219 | desc->response, | |
220 | interface_to_usbdev(desc->intf), | |
221 | /* using common endpoint 0 */ | |
222 | usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), | |
223 | (unsigned char *)req, | |
224 | desc->inbuf, | |
87d65e54 | 225 | desc->wMaxCommand, |
afba937e ON |
226 | wdm_in_callback, |
227 | desc | |
228 | ); | |
229 | desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
230 | spin_lock(&desc->iuspin); | |
231 | clear_bit(WDM_READ, &desc->flags); | |
232 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
233 | rv = usb_submit_urb(desc->response, GFP_ATOMIC); | |
234 | dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d", | |
235 | __func__, rv); | |
236 | } | |
237 | spin_unlock(&desc->iuspin); | |
238 | if (rv < 0) { | |
239 | if (rv == -EPERM) | |
240 | return; | |
241 | if (rv == -ENOMEM) { | |
242 | sw: | |
243 | rv = schedule_work(&desc->rxwork); | |
244 | if (rv) | |
9908a32e GKH |
245 | dev_err(&desc->intf->dev, |
246 | "Cannot schedule work\n"); | |
afba937e ON |
247 | } |
248 | } | |
249 | exit: | |
250 | rv = usb_submit_urb(urb, GFP_ATOMIC); | |
251 | if (rv) | |
9908a32e GKH |
252 | dev_err(&desc->intf->dev, |
253 | "%s - usb_submit_urb failed with result %d\n", | |
254 | __func__, rv); | |
afba937e ON |
255 | |
256 | } | |
257 | ||
258 | static void kill_urbs(struct wdm_device *desc) | |
259 | { | |
17d80d56 | 260 | /* the order here is essential */ |
afba937e ON |
261 | usb_kill_urb(desc->command); |
262 | usb_kill_urb(desc->validity); | |
263 | usb_kill_urb(desc->response); | |
264 | } | |
265 | ||
266 | static void free_urbs(struct wdm_device *desc) | |
267 | { | |
268 | usb_free_urb(desc->validity); | |
269 | usb_free_urb(desc->response); | |
270 | usb_free_urb(desc->command); | |
271 | } | |
272 | ||
273 | static void cleanup(struct wdm_device *desc) | |
274 | { | |
275 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
276 | desc->wMaxPacketSize, | |
277 | desc->sbuf, | |
278 | desc->validity->transfer_dma); | |
279 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
87d65e54 | 280 | desc->wMaxCommand, |
afba937e ON |
281 | desc->inbuf, |
282 | desc->response->transfer_dma); | |
283 | kfree(desc->orq); | |
284 | kfree(desc->irq); | |
285 | kfree(desc->ubuf); | |
286 | free_urbs(desc); | |
287 | kfree(desc); | |
288 | } | |
289 | ||
290 | static ssize_t wdm_write | |
291 | (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
292 | { | |
293 | u8 *buf; | |
294 | int rv = -EMSGSIZE, r, we; | |
295 | struct wdm_device *desc = file->private_data; | |
296 | struct usb_ctrlrequest *req; | |
297 | ||
298 | if (count > desc->wMaxCommand) | |
299 | count = desc->wMaxCommand; | |
300 | ||
301 | spin_lock_irq(&desc->iuspin); | |
302 | we = desc->werr; | |
303 | desc->werr = 0; | |
304 | spin_unlock_irq(&desc->iuspin); | |
305 | if (we < 0) | |
306 | return -EIO; | |
307 | ||
308 | r = mutex_lock_interruptible(&desc->wlock); /* concurrent writes */ | |
309 | rv = -ERESTARTSYS; | |
310 | if (r) | |
311 | goto outnl; | |
312 | ||
17d80d56 ON |
313 | r = usb_autopm_get_interface(desc->intf); |
314 | if (r < 0) | |
315 | goto outnp; | |
afba937e ON |
316 | r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, |
317 | &desc->flags)); | |
318 | if (r < 0) | |
319 | goto out; | |
320 | ||
321 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
322 | rv = -ENODEV; | |
323 | goto out; | |
324 | } | |
325 | ||
326 | desc->outbuf = buf = kmalloc(count, GFP_KERNEL); | |
327 | if (!buf) { | |
328 | rv = -ENOMEM; | |
329 | goto out; | |
330 | } | |
331 | ||
332 | r = copy_from_user(buf, buffer, count); | |
333 | if (r > 0) { | |
334 | kfree(buf); | |
335 | rv = -EFAULT; | |
336 | goto out; | |
337 | } | |
338 | ||
339 | req = desc->orq; | |
340 | usb_fill_control_urb( | |
341 | desc->command, | |
342 | interface_to_usbdev(desc->intf), | |
343 | /* using common endpoint 0 */ | |
344 | usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), | |
345 | (unsigned char *)req, | |
346 | buf, | |
347 | count, | |
348 | wdm_out_callback, | |
349 | desc | |
350 | ); | |
351 | ||
352 | req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | | |
353 | USB_RECIP_INTERFACE); | |
354 | req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; | |
355 | req->wValue = 0; | |
356 | req->wIndex = desc->inum; | |
357 | req->wLength = cpu_to_le16(count); | |
358 | set_bit(WDM_IN_USE, &desc->flags); | |
359 | ||
360 | rv = usb_submit_urb(desc->command, GFP_KERNEL); | |
361 | if (rv < 0) { | |
362 | kfree(buf); | |
363 | clear_bit(WDM_IN_USE, &desc->flags); | |
9908a32e | 364 | dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); |
afba937e ON |
365 | } else { |
366 | dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", | |
367 | req->wIndex); | |
368 | } | |
369 | out: | |
17d80d56 ON |
370 | usb_autopm_put_interface(desc->intf); |
371 | outnp: | |
afba937e ON |
372 | mutex_unlock(&desc->wlock); |
373 | outnl: | |
374 | return rv < 0 ? rv : count; | |
375 | } | |
376 | ||
377 | static ssize_t wdm_read | |
378 | (struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
379 | { | |
380 | int rv, cntr; | |
381 | int i = 0; | |
382 | struct wdm_device *desc = file->private_data; | |
383 | ||
384 | ||
385 | rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ | |
386 | if (rv < 0) | |
387 | return -ERESTARTSYS; | |
388 | ||
389 | if (desc->length == 0) { | |
390 | desc->read = 0; | |
391 | retry: | |
392 | i++; | |
393 | rv = wait_event_interruptible(desc->wait, | |
394 | test_bit(WDM_READ, &desc->flags)); | |
395 | ||
17d80d56 ON |
396 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
397 | rv = -ENODEV; | |
398 | goto err; | |
399 | } | |
400 | usb_mark_last_busy(interface_to_usbdev(desc->intf)); | |
afba937e ON |
401 | if (rv < 0) { |
402 | rv = -ERESTARTSYS; | |
403 | goto err; | |
404 | } | |
405 | ||
406 | spin_lock_irq(&desc->iuspin); | |
407 | ||
408 | if (desc->rerr) { /* read completed, error happened */ | |
409 | int t = desc->rerr; | |
410 | desc->rerr = 0; | |
411 | spin_unlock_irq(&desc->iuspin); | |
9908a32e GKH |
412 | dev_err(&desc->intf->dev, |
413 | "reading had resulted in %d\n", t); | |
afba937e ON |
414 | rv = -EIO; |
415 | goto err; | |
416 | } | |
417 | /* | |
418 | * recheck whether we've lost the race | |
419 | * against the completion handler | |
420 | */ | |
421 | if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ | |
422 | spin_unlock_irq(&desc->iuspin); | |
423 | goto retry; | |
424 | } | |
425 | if (!desc->reslength) { /* zero length read */ | |
426 | spin_unlock_irq(&desc->iuspin); | |
427 | goto retry; | |
428 | } | |
429 | clear_bit(WDM_READ, &desc->flags); | |
430 | spin_unlock_irq(&desc->iuspin); | |
431 | } | |
432 | ||
433 | cntr = count > desc->length ? desc->length : count; | |
434 | rv = copy_to_user(buffer, desc->ubuf, cntr); | |
435 | if (rv > 0) { | |
436 | rv = -EFAULT; | |
437 | goto err; | |
438 | } | |
439 | ||
440 | for (i = 0; i < desc->length - cntr; i++) | |
441 | desc->ubuf[i] = desc->ubuf[i + cntr]; | |
442 | ||
443 | desc->length -= cntr; | |
87d65e54 ON |
444 | /* in case we had outstanding data */ |
445 | if (!desc->length) | |
446 | clear_bit(WDM_READ, &desc->flags); | |
afba937e ON |
447 | rv = cntr; |
448 | ||
449 | err: | |
450 | mutex_unlock(&desc->rlock); | |
451 | if (rv < 0) | |
9908a32e | 452 | dev_err(&desc->intf->dev, "wdm_read: exit error\n"); |
afba937e ON |
453 | return rv; |
454 | } | |
455 | ||
456 | static int wdm_flush(struct file *file, fl_owner_t id) | |
457 | { | |
458 | struct wdm_device *desc = file->private_data; | |
459 | ||
460 | wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); | |
461 | if (desc->werr < 0) | |
9908a32e GKH |
462 | dev_err(&desc->intf->dev, "Error in flush path: %d\n", |
463 | desc->werr); | |
afba937e ON |
464 | |
465 | return desc->werr; | |
466 | } | |
467 | ||
468 | static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) | |
469 | { | |
470 | struct wdm_device *desc = file->private_data; | |
471 | unsigned long flags; | |
472 | unsigned int mask = 0; | |
473 | ||
474 | spin_lock_irqsave(&desc->iuspin, flags); | |
475 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
476 | mask = POLLERR; | |
477 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
478 | goto desc_out; | |
479 | } | |
480 | if (test_bit(WDM_READ, &desc->flags)) | |
481 | mask = POLLIN | POLLRDNORM; | |
482 | if (desc->rerr || desc->werr) | |
483 | mask |= POLLERR; | |
484 | if (!test_bit(WDM_IN_USE, &desc->flags)) | |
485 | mask |= POLLOUT | POLLWRNORM; | |
486 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
487 | ||
488 | poll_wait(file, &desc->wait, wait); | |
489 | ||
490 | desc_out: | |
491 | return mask; | |
492 | } | |
493 | ||
494 | static int wdm_open(struct inode *inode, struct file *file) | |
495 | { | |
496 | int minor = iminor(inode); | |
497 | int rv = -ENODEV; | |
498 | struct usb_interface *intf; | |
499 | struct wdm_device *desc; | |
500 | ||
501 | mutex_lock(&wdm_mutex); | |
502 | intf = usb_find_interface(&wdm_driver, minor); | |
503 | if (!intf) | |
504 | goto out; | |
505 | ||
506 | desc = usb_get_intfdata(intf); | |
507 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) | |
508 | goto out; | |
afba937e ON |
509 | file->private_data = desc; |
510 | ||
17d80d56 | 511 | rv = usb_autopm_get_interface(desc->intf); |
afba937e | 512 | if (rv < 0) { |
9908a32e | 513 | dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); |
afba937e ON |
514 | goto out; |
515 | } | |
17d80d56 | 516 | intf->needs_remote_wakeup = 1; |
afba937e | 517 | |
17d80d56 ON |
518 | mutex_lock(&desc->plock); |
519 | if (!desc->count++) { | |
520 | rv = usb_submit_urb(desc->validity, GFP_KERNEL); | |
521 | if (rv < 0) { | |
522 | desc->count--; | |
9908a32e GKH |
523 | dev_err(&desc->intf->dev, |
524 | "Error submitting int urb - %d\n", rv); | |
17d80d56 ON |
525 | } |
526 | } else { | |
527 | rv = 0; | |
528 | } | |
529 | mutex_unlock(&desc->plock); | |
530 | usb_autopm_put_interface(desc->intf); | |
afba937e ON |
531 | out: |
532 | mutex_unlock(&wdm_mutex); | |
533 | return rv; | |
534 | } | |
535 | ||
536 | static int wdm_release(struct inode *inode, struct file *file) | |
537 | { | |
538 | struct wdm_device *desc = file->private_data; | |
539 | ||
540 | mutex_lock(&wdm_mutex); | |
17d80d56 | 541 | mutex_lock(&desc->plock); |
afba937e | 542 | desc->count--; |
17d80d56 ON |
543 | mutex_unlock(&desc->plock); |
544 | ||
afba937e ON |
545 | if (!desc->count) { |
546 | dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); | |
547 | kill_urbs(desc); | |
17d80d56 ON |
548 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
549 | desc->intf->needs_remote_wakeup = 0; | |
afba937e ON |
550 | } |
551 | mutex_unlock(&wdm_mutex); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | static const struct file_operations wdm_fops = { | |
556 | .owner = THIS_MODULE, | |
557 | .read = wdm_read, | |
558 | .write = wdm_write, | |
559 | .open = wdm_open, | |
560 | .flush = wdm_flush, | |
561 | .release = wdm_release, | |
562 | .poll = wdm_poll | |
563 | }; | |
564 | ||
565 | static struct usb_class_driver wdm_class = { | |
566 | .name = "cdc-wdm%d", | |
567 | .fops = &wdm_fops, | |
568 | .minor_base = WDM_MINOR_BASE, | |
569 | }; | |
570 | ||
571 | /* --- error handling --- */ | |
572 | static void wdm_rxwork(struct work_struct *work) | |
573 | { | |
574 | struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); | |
575 | unsigned long flags; | |
576 | int rv; | |
577 | ||
578 | spin_lock_irqsave(&desc->iuspin, flags); | |
579 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
580 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
581 | } else { | |
582 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
583 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
584 | if (rv < 0 && rv != -EPERM) { | |
585 | spin_lock_irqsave(&desc->iuspin, flags); | |
586 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) | |
587 | schedule_work(&desc->rxwork); | |
588 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
589 | } | |
590 | } | |
591 | } | |
592 | ||
593 | /* --- hotplug --- */ | |
594 | ||
595 | static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
596 | { | |
597 | int rv = -EINVAL; | |
598 | struct usb_device *udev = interface_to_usbdev(intf); | |
599 | struct wdm_device *desc; | |
600 | struct usb_host_interface *iface; | |
601 | struct usb_endpoint_descriptor *ep; | |
602 | struct usb_cdc_dmm_desc *dmhd; | |
603 | u8 *buffer = intf->altsetting->extra; | |
604 | int buflen = intf->altsetting->extralen; | |
605 | u16 maxcom = 0; | |
606 | ||
607 | if (!buffer) | |
608 | goto out; | |
609 | ||
052fbc0d | 610 | while (buflen > 2) { |
afba937e | 611 | if (buffer [1] != USB_DT_CS_INTERFACE) { |
9908a32e | 612 | dev_err(&intf->dev, "skipping garbage\n"); |
afba937e ON |
613 | goto next_desc; |
614 | } | |
615 | ||
616 | switch (buffer [2]) { | |
617 | case USB_CDC_HEADER_TYPE: | |
618 | break; | |
619 | case USB_CDC_DMM_TYPE: | |
620 | dmhd = (struct usb_cdc_dmm_desc *)buffer; | |
621 | maxcom = le16_to_cpu(dmhd->wMaxCommand); | |
622 | dev_dbg(&intf->dev, | |
623 | "Finding maximum buffer length: %d", maxcom); | |
624 | break; | |
625 | default: | |
9908a32e GKH |
626 | dev_err(&intf->dev, |
627 | "Ignoring extra header, type %d, length %d\n", | |
afba937e ON |
628 | buffer[2], buffer[0]); |
629 | break; | |
630 | } | |
631 | next_desc: | |
632 | buflen -= buffer[0]; | |
633 | buffer += buffer[0]; | |
634 | } | |
635 | ||
636 | rv = -ENOMEM; | |
637 | desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); | |
638 | if (!desc) | |
639 | goto out; | |
640 | mutex_init(&desc->wlock); | |
641 | mutex_init(&desc->rlock); | |
17d80d56 | 642 | mutex_init(&desc->plock); |
afba937e ON |
643 | spin_lock_init(&desc->iuspin); |
644 | init_waitqueue_head(&desc->wait); | |
645 | desc->wMaxCommand = maxcom; | |
052fbc0d | 646 | /* this will be expanded and needed in hardware endianness */ |
afba937e ON |
647 | desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); |
648 | desc->intf = intf; | |
649 | INIT_WORK(&desc->rxwork, wdm_rxwork); | |
650 | ||
052fbc0d ON |
651 | rv = -EINVAL; |
652 | iface = intf->cur_altsetting; | |
653 | if (iface->desc.bNumEndpoints != 1) | |
654 | goto err; | |
afba937e | 655 | ep = &iface->endpoint[0].desc; |
052fbc0d | 656 | if (!ep || !usb_endpoint_is_int_in(ep)) |
afba937e | 657 | goto err; |
afba937e | 658 | |
fa4144b7 AV |
659 | desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize); |
660 | desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0; | |
afba937e ON |
661 | |
662 | desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
663 | if (!desc->orq) | |
664 | goto err; | |
665 | desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
666 | if (!desc->irq) | |
667 | goto err; | |
668 | ||
669 | desc->validity = usb_alloc_urb(0, GFP_KERNEL); | |
670 | if (!desc->validity) | |
671 | goto err; | |
672 | ||
673 | desc->response = usb_alloc_urb(0, GFP_KERNEL); | |
674 | if (!desc->response) | |
675 | goto err; | |
676 | ||
677 | desc->command = usb_alloc_urb(0, GFP_KERNEL); | |
678 | if (!desc->command) | |
679 | goto err; | |
680 | ||
681 | desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); | |
682 | if (!desc->ubuf) | |
683 | goto err; | |
684 | ||
685 | desc->sbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
686 | desc->wMaxPacketSize, | |
687 | GFP_KERNEL, | |
688 | &desc->validity->transfer_dma); | |
689 | if (!desc->sbuf) | |
690 | goto err; | |
691 | ||
692 | desc->inbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
693 | desc->bMaxPacketSize0, | |
694 | GFP_KERNEL, | |
695 | &desc->response->transfer_dma); | |
696 | if (!desc->inbuf) | |
697 | goto err2; | |
698 | ||
699 | usb_fill_int_urb( | |
700 | desc->validity, | |
701 | interface_to_usbdev(intf), | |
702 | usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), | |
703 | desc->sbuf, | |
704 | desc->wMaxPacketSize, | |
705 | wdm_int_callback, | |
706 | desc, | |
707 | ep->bInterval | |
708 | ); | |
709 | desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
710 | ||
711 | usb_set_intfdata(intf, desc); | |
712 | rv = usb_register_dev(intf, &wdm_class); | |
afba937e | 713 | if (rv < 0) |
052fbc0d ON |
714 | goto err3; |
715 | else | |
716 | dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n", | |
717 | intf->minor - WDM_MINOR_BASE); | |
afba937e ON |
718 | out: |
719 | return rv; | |
052fbc0d ON |
720 | err3: |
721 | usb_set_intfdata(intf, NULL); | |
722 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
723 | desc->bMaxPacketSize0, | |
724 | desc->inbuf, | |
725 | desc->response->transfer_dma); | |
afba937e ON |
726 | err2: |
727 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
728 | desc->wMaxPacketSize, | |
729 | desc->sbuf, | |
730 | desc->validity->transfer_dma); | |
731 | err: | |
732 | free_urbs(desc); | |
733 | kfree(desc->ubuf); | |
734 | kfree(desc->orq); | |
735 | kfree(desc->irq); | |
736 | kfree(desc); | |
737 | return rv; | |
738 | } | |
739 | ||
740 | static void wdm_disconnect(struct usb_interface *intf) | |
741 | { | |
742 | struct wdm_device *desc; | |
743 | unsigned long flags; | |
744 | ||
745 | usb_deregister_dev(intf, &wdm_class); | |
746 | mutex_lock(&wdm_mutex); | |
747 | desc = usb_get_intfdata(intf); | |
748 | ||
749 | /* the spinlock makes sure no new urbs are generated in the callbacks */ | |
750 | spin_lock_irqsave(&desc->iuspin, flags); | |
751 | set_bit(WDM_DISCONNECTING, &desc->flags); | |
752 | set_bit(WDM_READ, &desc->flags); | |
17d80d56 | 753 | /* to terminate pending flushes */ |
afba937e ON |
754 | clear_bit(WDM_IN_USE, &desc->flags); |
755 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
756 | cancel_work_sync(&desc->rxwork); | |
757 | kill_urbs(desc); | |
758 | wake_up_all(&desc->wait); | |
759 | if (!desc->count) | |
760 | cleanup(desc); | |
761 | mutex_unlock(&wdm_mutex); | |
762 | } | |
763 | ||
17d80d56 ON |
764 | static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
765 | { | |
766 | struct wdm_device *desc = usb_get_intfdata(intf); | |
767 | int rv = 0; | |
768 | ||
769 | dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); | |
770 | ||
771 | mutex_lock(&desc->plock); | |
35758589 | 772 | #ifdef CONFIG_PM |
65bfd296 AS |
773 | if ((message.event & PM_EVENT_AUTO) && |
774 | test_bit(WDM_IN_USE, &desc->flags)) { | |
17d80d56 ON |
775 | rv = -EBUSY; |
776 | } else { | |
35758589 | 777 | #endif |
17d80d56 ON |
778 | cancel_work_sync(&desc->rxwork); |
779 | kill_urbs(desc); | |
35758589 | 780 | #ifdef CONFIG_PM |
17d80d56 | 781 | } |
35758589 | 782 | #endif |
17d80d56 ON |
783 | mutex_unlock(&desc->plock); |
784 | ||
785 | return rv; | |
786 | } | |
787 | ||
788 | static int recover_from_urb_loss(struct wdm_device *desc) | |
789 | { | |
790 | int rv = 0; | |
791 | ||
792 | if (desc->count) { | |
793 | rv = usb_submit_urb(desc->validity, GFP_NOIO); | |
794 | if (rv < 0) | |
9908a32e GKH |
795 | dev_err(&desc->intf->dev, |
796 | "Error resume submitting int urb - %d\n", rv); | |
17d80d56 ON |
797 | } |
798 | return rv; | |
799 | } | |
800 | static int wdm_resume(struct usb_interface *intf) | |
801 | { | |
802 | struct wdm_device *desc = usb_get_intfdata(intf); | |
803 | int rv; | |
804 | ||
805 | dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); | |
806 | mutex_lock(&desc->plock); | |
807 | rv = recover_from_urb_loss(desc); | |
808 | mutex_unlock(&desc->plock); | |
809 | return rv; | |
810 | } | |
811 | ||
812 | static int wdm_pre_reset(struct usb_interface *intf) | |
813 | { | |
814 | struct wdm_device *desc = usb_get_intfdata(intf); | |
815 | ||
816 | mutex_lock(&desc->plock); | |
817 | return 0; | |
818 | } | |
819 | ||
820 | static int wdm_post_reset(struct usb_interface *intf) | |
821 | { | |
822 | struct wdm_device *desc = usb_get_intfdata(intf); | |
823 | int rv; | |
824 | ||
825 | rv = recover_from_urb_loss(desc); | |
826 | mutex_unlock(&desc->plock); | |
827 | return 0; | |
828 | } | |
829 | ||
afba937e ON |
830 | static struct usb_driver wdm_driver = { |
831 | .name = "cdc_wdm", | |
832 | .probe = wdm_probe, | |
833 | .disconnect = wdm_disconnect, | |
17d80d56 ON |
834 | .suspend = wdm_suspend, |
835 | .resume = wdm_resume, | |
836 | .reset_resume = wdm_resume, | |
837 | .pre_reset = wdm_pre_reset, | |
838 | .post_reset = wdm_post_reset, | |
afba937e | 839 | .id_table = wdm_ids, |
17d80d56 | 840 | .supports_autosuspend = 1, |
afba937e ON |
841 | }; |
842 | ||
843 | /* --- low level module stuff --- */ | |
844 | ||
845 | static int __init wdm_init(void) | |
846 | { | |
847 | int rv; | |
848 | ||
849 | rv = usb_register(&wdm_driver); | |
850 | ||
851 | return rv; | |
852 | } | |
853 | ||
854 | static void __exit wdm_exit(void) | |
855 | { | |
856 | usb_deregister(&wdm_driver); | |
857 | } | |
858 | ||
859 | module_init(wdm_init); | |
860 | module_exit(wdm_exit); | |
861 | ||
862 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
87d65e54 | 863 | MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e | 864 | MODULE_LICENSE("GPL"); |