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; | |
7f1dc313 ON |
316 | |
317 | if (!file->f_flags && O_NONBLOCK) | |
318 | r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, | |
319 | &desc->flags)); | |
320 | else | |
321 | if (test_bit(WDM_IN_USE, &desc->flags)) | |
322 | r = -EAGAIN; | |
afba937e ON |
323 | if (r < 0) |
324 | goto out; | |
325 | ||
326 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
327 | rv = -ENODEV; | |
328 | goto out; | |
329 | } | |
330 | ||
331 | desc->outbuf = buf = kmalloc(count, GFP_KERNEL); | |
332 | if (!buf) { | |
333 | rv = -ENOMEM; | |
334 | goto out; | |
335 | } | |
336 | ||
337 | r = copy_from_user(buf, buffer, count); | |
338 | if (r > 0) { | |
339 | kfree(buf); | |
340 | rv = -EFAULT; | |
341 | goto out; | |
342 | } | |
343 | ||
344 | req = desc->orq; | |
345 | usb_fill_control_urb( | |
346 | desc->command, | |
347 | interface_to_usbdev(desc->intf), | |
348 | /* using common endpoint 0 */ | |
349 | usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), | |
350 | (unsigned char *)req, | |
351 | buf, | |
352 | count, | |
353 | wdm_out_callback, | |
354 | desc | |
355 | ); | |
356 | ||
357 | req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | | |
358 | USB_RECIP_INTERFACE); | |
359 | req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; | |
360 | req->wValue = 0; | |
361 | req->wIndex = desc->inum; | |
362 | req->wLength = cpu_to_le16(count); | |
363 | set_bit(WDM_IN_USE, &desc->flags); | |
364 | ||
365 | rv = usb_submit_urb(desc->command, GFP_KERNEL); | |
366 | if (rv < 0) { | |
367 | kfree(buf); | |
368 | clear_bit(WDM_IN_USE, &desc->flags); | |
9908a32e | 369 | dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); |
afba937e ON |
370 | } else { |
371 | dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", | |
372 | req->wIndex); | |
373 | } | |
374 | out: | |
17d80d56 ON |
375 | usb_autopm_put_interface(desc->intf); |
376 | outnp: | |
afba937e ON |
377 | mutex_unlock(&desc->wlock); |
378 | outnl: | |
379 | return rv < 0 ? rv : count; | |
380 | } | |
381 | ||
382 | static ssize_t wdm_read | |
383 | (struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
384 | { | |
7f1dc313 | 385 | int rv, cntr = 0; |
afba937e ON |
386 | int i = 0; |
387 | struct wdm_device *desc = file->private_data; | |
388 | ||
389 | ||
390 | rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ | |
391 | if (rv < 0) | |
392 | return -ERESTARTSYS; | |
393 | ||
394 | if (desc->length == 0) { | |
395 | desc->read = 0; | |
396 | retry: | |
7f1dc313 ON |
397 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
398 | rv = -ENODEV; | |
399 | goto err; | |
400 | } | |
afba937e | 401 | i++; |
7f1dc313 ON |
402 | if (file->f_flags & O_NONBLOCK) { |
403 | if (!test_bit(WDM_READ, &desc->flags)) { | |
404 | rv = cntr ? cntr : -EAGAIN; | |
405 | goto err; | |
406 | } | |
407 | rv = 0; | |
408 | } else { | |
409 | rv = wait_event_interruptible(desc->wait, | |
410 | test_bit(WDM_READ, &desc->flags)); | |
411 | } | |
afba937e | 412 | |
7f1dc313 | 413 | /* may have happened while we slept */ |
17d80d56 ON |
414 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
415 | rv = -ENODEV; | |
416 | goto err; | |
417 | } | |
418 | usb_mark_last_busy(interface_to_usbdev(desc->intf)); | |
afba937e ON |
419 | if (rv < 0) { |
420 | rv = -ERESTARTSYS; | |
421 | goto err; | |
422 | } | |
423 | ||
424 | spin_lock_irq(&desc->iuspin); | |
425 | ||
426 | if (desc->rerr) { /* read completed, error happened */ | |
427 | int t = desc->rerr; | |
428 | desc->rerr = 0; | |
429 | spin_unlock_irq(&desc->iuspin); | |
9908a32e GKH |
430 | dev_err(&desc->intf->dev, |
431 | "reading had resulted in %d\n", t); | |
afba937e ON |
432 | rv = -EIO; |
433 | goto err; | |
434 | } | |
435 | /* | |
436 | * recheck whether we've lost the race | |
437 | * against the completion handler | |
438 | */ | |
439 | if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ | |
440 | spin_unlock_irq(&desc->iuspin); | |
441 | goto retry; | |
442 | } | |
443 | if (!desc->reslength) { /* zero length read */ | |
444 | spin_unlock_irq(&desc->iuspin); | |
445 | goto retry; | |
446 | } | |
447 | clear_bit(WDM_READ, &desc->flags); | |
448 | spin_unlock_irq(&desc->iuspin); | |
449 | } | |
450 | ||
451 | cntr = count > desc->length ? desc->length : count; | |
452 | rv = copy_to_user(buffer, desc->ubuf, cntr); | |
453 | if (rv > 0) { | |
454 | rv = -EFAULT; | |
455 | goto err; | |
456 | } | |
457 | ||
458 | for (i = 0; i < desc->length - cntr; i++) | |
459 | desc->ubuf[i] = desc->ubuf[i + cntr]; | |
460 | ||
461 | desc->length -= cntr; | |
87d65e54 ON |
462 | /* in case we had outstanding data */ |
463 | if (!desc->length) | |
464 | clear_bit(WDM_READ, &desc->flags); | |
afba937e ON |
465 | rv = cntr; |
466 | ||
467 | err: | |
468 | mutex_unlock(&desc->rlock); | |
7f1dc313 | 469 | if (rv < 0 && rv != -EAGAIN) |
9908a32e | 470 | dev_err(&desc->intf->dev, "wdm_read: exit error\n"); |
afba937e ON |
471 | return rv; |
472 | } | |
473 | ||
474 | static int wdm_flush(struct file *file, fl_owner_t id) | |
475 | { | |
476 | struct wdm_device *desc = file->private_data; | |
477 | ||
478 | wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); | |
479 | if (desc->werr < 0) | |
9908a32e GKH |
480 | dev_err(&desc->intf->dev, "Error in flush path: %d\n", |
481 | desc->werr); | |
afba937e ON |
482 | |
483 | return desc->werr; | |
484 | } | |
485 | ||
486 | static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) | |
487 | { | |
488 | struct wdm_device *desc = file->private_data; | |
489 | unsigned long flags; | |
490 | unsigned int mask = 0; | |
491 | ||
492 | spin_lock_irqsave(&desc->iuspin, flags); | |
493 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
494 | mask = POLLERR; | |
495 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
496 | goto desc_out; | |
497 | } | |
498 | if (test_bit(WDM_READ, &desc->flags)) | |
499 | mask = POLLIN | POLLRDNORM; | |
500 | if (desc->rerr || desc->werr) | |
501 | mask |= POLLERR; | |
502 | if (!test_bit(WDM_IN_USE, &desc->flags)) | |
503 | mask |= POLLOUT | POLLWRNORM; | |
504 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
505 | ||
506 | poll_wait(file, &desc->wait, wait); | |
507 | ||
508 | desc_out: | |
509 | return mask; | |
510 | } | |
511 | ||
512 | static int wdm_open(struct inode *inode, struct file *file) | |
513 | { | |
514 | int minor = iminor(inode); | |
515 | int rv = -ENODEV; | |
516 | struct usb_interface *intf; | |
517 | struct wdm_device *desc; | |
518 | ||
519 | mutex_lock(&wdm_mutex); | |
520 | intf = usb_find_interface(&wdm_driver, minor); | |
521 | if (!intf) | |
522 | goto out; | |
523 | ||
524 | desc = usb_get_intfdata(intf); | |
525 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) | |
526 | goto out; | |
afba937e ON |
527 | file->private_data = desc; |
528 | ||
17d80d56 | 529 | rv = usb_autopm_get_interface(desc->intf); |
afba937e | 530 | if (rv < 0) { |
9908a32e | 531 | dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); |
afba937e ON |
532 | goto out; |
533 | } | |
17d80d56 | 534 | intf->needs_remote_wakeup = 1; |
afba937e | 535 | |
17d80d56 ON |
536 | mutex_lock(&desc->plock); |
537 | if (!desc->count++) { | |
538 | rv = usb_submit_urb(desc->validity, GFP_KERNEL); | |
539 | if (rv < 0) { | |
540 | desc->count--; | |
9908a32e GKH |
541 | dev_err(&desc->intf->dev, |
542 | "Error submitting int urb - %d\n", rv); | |
17d80d56 ON |
543 | } |
544 | } else { | |
545 | rv = 0; | |
546 | } | |
547 | mutex_unlock(&desc->plock); | |
548 | usb_autopm_put_interface(desc->intf); | |
afba937e ON |
549 | out: |
550 | mutex_unlock(&wdm_mutex); | |
551 | return rv; | |
552 | } | |
553 | ||
554 | static int wdm_release(struct inode *inode, struct file *file) | |
555 | { | |
556 | struct wdm_device *desc = file->private_data; | |
557 | ||
558 | mutex_lock(&wdm_mutex); | |
17d80d56 | 559 | mutex_lock(&desc->plock); |
afba937e | 560 | desc->count--; |
17d80d56 ON |
561 | mutex_unlock(&desc->plock); |
562 | ||
afba937e ON |
563 | if (!desc->count) { |
564 | dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); | |
565 | kill_urbs(desc); | |
17d80d56 ON |
566 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
567 | desc->intf->needs_remote_wakeup = 0; | |
afba937e ON |
568 | } |
569 | mutex_unlock(&wdm_mutex); | |
570 | return 0; | |
571 | } | |
572 | ||
573 | static const struct file_operations wdm_fops = { | |
574 | .owner = THIS_MODULE, | |
575 | .read = wdm_read, | |
576 | .write = wdm_write, | |
577 | .open = wdm_open, | |
578 | .flush = wdm_flush, | |
579 | .release = wdm_release, | |
580 | .poll = wdm_poll | |
581 | }; | |
582 | ||
583 | static struct usb_class_driver wdm_class = { | |
584 | .name = "cdc-wdm%d", | |
585 | .fops = &wdm_fops, | |
586 | .minor_base = WDM_MINOR_BASE, | |
587 | }; | |
588 | ||
589 | /* --- error handling --- */ | |
590 | static void wdm_rxwork(struct work_struct *work) | |
591 | { | |
592 | struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); | |
593 | unsigned long flags; | |
594 | int rv; | |
595 | ||
596 | spin_lock_irqsave(&desc->iuspin, flags); | |
597 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
598 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
599 | } else { | |
600 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
601 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
602 | if (rv < 0 && rv != -EPERM) { | |
603 | spin_lock_irqsave(&desc->iuspin, flags); | |
604 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) | |
605 | schedule_work(&desc->rxwork); | |
606 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
607 | } | |
608 | } | |
609 | } | |
610 | ||
611 | /* --- hotplug --- */ | |
612 | ||
613 | static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
614 | { | |
615 | int rv = -EINVAL; | |
616 | struct usb_device *udev = interface_to_usbdev(intf); | |
617 | struct wdm_device *desc; | |
618 | struct usb_host_interface *iface; | |
619 | struct usb_endpoint_descriptor *ep; | |
620 | struct usb_cdc_dmm_desc *dmhd; | |
621 | u8 *buffer = intf->altsetting->extra; | |
622 | int buflen = intf->altsetting->extralen; | |
623 | u16 maxcom = 0; | |
624 | ||
625 | if (!buffer) | |
626 | goto out; | |
627 | ||
052fbc0d | 628 | while (buflen > 2) { |
afba937e | 629 | if (buffer [1] != USB_DT_CS_INTERFACE) { |
9908a32e | 630 | dev_err(&intf->dev, "skipping garbage\n"); |
afba937e ON |
631 | goto next_desc; |
632 | } | |
633 | ||
634 | switch (buffer [2]) { | |
635 | case USB_CDC_HEADER_TYPE: | |
636 | break; | |
637 | case USB_CDC_DMM_TYPE: | |
638 | dmhd = (struct usb_cdc_dmm_desc *)buffer; | |
639 | maxcom = le16_to_cpu(dmhd->wMaxCommand); | |
640 | dev_dbg(&intf->dev, | |
641 | "Finding maximum buffer length: %d", maxcom); | |
642 | break; | |
643 | default: | |
9908a32e GKH |
644 | dev_err(&intf->dev, |
645 | "Ignoring extra header, type %d, length %d\n", | |
afba937e ON |
646 | buffer[2], buffer[0]); |
647 | break; | |
648 | } | |
649 | next_desc: | |
650 | buflen -= buffer[0]; | |
651 | buffer += buffer[0]; | |
652 | } | |
653 | ||
654 | rv = -ENOMEM; | |
655 | desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); | |
656 | if (!desc) | |
657 | goto out; | |
658 | mutex_init(&desc->wlock); | |
659 | mutex_init(&desc->rlock); | |
17d80d56 | 660 | mutex_init(&desc->plock); |
afba937e ON |
661 | spin_lock_init(&desc->iuspin); |
662 | init_waitqueue_head(&desc->wait); | |
663 | desc->wMaxCommand = maxcom; | |
052fbc0d | 664 | /* this will be expanded and needed in hardware endianness */ |
afba937e ON |
665 | desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); |
666 | desc->intf = intf; | |
667 | INIT_WORK(&desc->rxwork, wdm_rxwork); | |
668 | ||
052fbc0d ON |
669 | rv = -EINVAL; |
670 | iface = intf->cur_altsetting; | |
671 | if (iface->desc.bNumEndpoints != 1) | |
672 | goto err; | |
afba937e | 673 | ep = &iface->endpoint[0].desc; |
052fbc0d | 674 | if (!ep || !usb_endpoint_is_int_in(ep)) |
afba937e | 675 | goto err; |
afba937e | 676 | |
fa4144b7 AV |
677 | desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize); |
678 | desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0; | |
afba937e ON |
679 | |
680 | desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
681 | if (!desc->orq) | |
682 | goto err; | |
683 | desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
684 | if (!desc->irq) | |
685 | goto err; | |
686 | ||
687 | desc->validity = usb_alloc_urb(0, GFP_KERNEL); | |
688 | if (!desc->validity) | |
689 | goto err; | |
690 | ||
691 | desc->response = usb_alloc_urb(0, GFP_KERNEL); | |
692 | if (!desc->response) | |
693 | goto err; | |
694 | ||
695 | desc->command = usb_alloc_urb(0, GFP_KERNEL); | |
696 | if (!desc->command) | |
697 | goto err; | |
698 | ||
699 | desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); | |
700 | if (!desc->ubuf) | |
701 | goto err; | |
702 | ||
703 | desc->sbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
704 | desc->wMaxPacketSize, | |
705 | GFP_KERNEL, | |
706 | &desc->validity->transfer_dma); | |
707 | if (!desc->sbuf) | |
708 | goto err; | |
709 | ||
710 | desc->inbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
711 | desc->bMaxPacketSize0, | |
712 | GFP_KERNEL, | |
713 | &desc->response->transfer_dma); | |
714 | if (!desc->inbuf) | |
715 | goto err2; | |
716 | ||
717 | usb_fill_int_urb( | |
718 | desc->validity, | |
719 | interface_to_usbdev(intf), | |
720 | usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), | |
721 | desc->sbuf, | |
722 | desc->wMaxPacketSize, | |
723 | wdm_int_callback, | |
724 | desc, | |
725 | ep->bInterval | |
726 | ); | |
727 | desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
728 | ||
729 | usb_set_intfdata(intf, desc); | |
730 | rv = usb_register_dev(intf, &wdm_class); | |
afba937e | 731 | if (rv < 0) |
052fbc0d ON |
732 | goto err3; |
733 | else | |
734 | dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n", | |
735 | intf->minor - WDM_MINOR_BASE); | |
afba937e ON |
736 | out: |
737 | return rv; | |
052fbc0d ON |
738 | err3: |
739 | usb_set_intfdata(intf, NULL); | |
740 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
741 | desc->bMaxPacketSize0, | |
742 | desc->inbuf, | |
743 | desc->response->transfer_dma); | |
afba937e ON |
744 | err2: |
745 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
746 | desc->wMaxPacketSize, | |
747 | desc->sbuf, | |
748 | desc->validity->transfer_dma); | |
749 | err: | |
750 | free_urbs(desc); | |
751 | kfree(desc->ubuf); | |
752 | kfree(desc->orq); | |
753 | kfree(desc->irq); | |
754 | kfree(desc); | |
755 | return rv; | |
756 | } | |
757 | ||
758 | static void wdm_disconnect(struct usb_interface *intf) | |
759 | { | |
760 | struct wdm_device *desc; | |
761 | unsigned long flags; | |
762 | ||
763 | usb_deregister_dev(intf, &wdm_class); | |
764 | mutex_lock(&wdm_mutex); | |
765 | desc = usb_get_intfdata(intf); | |
766 | ||
767 | /* the spinlock makes sure no new urbs are generated in the callbacks */ | |
768 | spin_lock_irqsave(&desc->iuspin, flags); | |
769 | set_bit(WDM_DISCONNECTING, &desc->flags); | |
770 | set_bit(WDM_READ, &desc->flags); | |
17d80d56 | 771 | /* to terminate pending flushes */ |
afba937e ON |
772 | clear_bit(WDM_IN_USE, &desc->flags); |
773 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
774 | cancel_work_sync(&desc->rxwork); | |
775 | kill_urbs(desc); | |
776 | wake_up_all(&desc->wait); | |
777 | if (!desc->count) | |
778 | cleanup(desc); | |
779 | mutex_unlock(&wdm_mutex); | |
780 | } | |
781 | ||
17d80d56 ON |
782 | static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
783 | { | |
784 | struct wdm_device *desc = usb_get_intfdata(intf); | |
785 | int rv = 0; | |
786 | ||
787 | dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); | |
788 | ||
789 | mutex_lock(&desc->plock); | |
35758589 | 790 | #ifdef CONFIG_PM |
65bfd296 AS |
791 | if ((message.event & PM_EVENT_AUTO) && |
792 | test_bit(WDM_IN_USE, &desc->flags)) { | |
17d80d56 ON |
793 | rv = -EBUSY; |
794 | } else { | |
35758589 | 795 | #endif |
17d80d56 ON |
796 | cancel_work_sync(&desc->rxwork); |
797 | kill_urbs(desc); | |
35758589 | 798 | #ifdef CONFIG_PM |
17d80d56 | 799 | } |
35758589 | 800 | #endif |
17d80d56 ON |
801 | mutex_unlock(&desc->plock); |
802 | ||
803 | return rv; | |
804 | } | |
805 | ||
806 | static int recover_from_urb_loss(struct wdm_device *desc) | |
807 | { | |
808 | int rv = 0; | |
809 | ||
810 | if (desc->count) { | |
811 | rv = usb_submit_urb(desc->validity, GFP_NOIO); | |
812 | if (rv < 0) | |
9908a32e GKH |
813 | dev_err(&desc->intf->dev, |
814 | "Error resume submitting int urb - %d\n", rv); | |
17d80d56 ON |
815 | } |
816 | return rv; | |
817 | } | |
818 | static int wdm_resume(struct usb_interface *intf) | |
819 | { | |
820 | struct wdm_device *desc = usb_get_intfdata(intf); | |
821 | int rv; | |
822 | ||
823 | dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); | |
824 | mutex_lock(&desc->plock); | |
825 | rv = recover_from_urb_loss(desc); | |
826 | mutex_unlock(&desc->plock); | |
827 | return rv; | |
828 | } | |
829 | ||
830 | static int wdm_pre_reset(struct usb_interface *intf) | |
831 | { | |
832 | struct wdm_device *desc = usb_get_intfdata(intf); | |
833 | ||
834 | mutex_lock(&desc->plock); | |
835 | return 0; | |
836 | } | |
837 | ||
838 | static int wdm_post_reset(struct usb_interface *intf) | |
839 | { | |
840 | struct wdm_device *desc = usb_get_intfdata(intf); | |
841 | int rv; | |
842 | ||
843 | rv = recover_from_urb_loss(desc); | |
844 | mutex_unlock(&desc->plock); | |
845 | return 0; | |
846 | } | |
847 | ||
afba937e ON |
848 | static struct usb_driver wdm_driver = { |
849 | .name = "cdc_wdm", | |
850 | .probe = wdm_probe, | |
851 | .disconnect = wdm_disconnect, | |
17d80d56 ON |
852 | .suspend = wdm_suspend, |
853 | .resume = wdm_resume, | |
854 | .reset_resume = wdm_resume, | |
855 | .pre_reset = wdm_pre_reset, | |
856 | .post_reset = wdm_post_reset, | |
afba937e | 857 | .id_table = wdm_ids, |
17d80d56 | 858 | .supports_autosuspend = 1, |
afba937e ON |
859 | }; |
860 | ||
861 | /* --- low level module stuff --- */ | |
862 | ||
863 | static int __init wdm_init(void) | |
864 | { | |
865 | int rv; | |
866 | ||
867 | rv = usb_register(&wdm_driver); | |
868 | ||
869 | return rv; | |
870 | } | |
871 | ||
872 | static void __exit wdm_exit(void) | |
873 | { | |
874 | usb_deregister(&wdm_driver); | |
875 | } | |
876 | ||
877 | module_init(wdm_init); | |
878 | module_exit(wdm_exit); | |
879 | ||
880 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
87d65e54 | 881 | MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e | 882 | MODULE_LICENSE("GPL"); |