Commit | Line | Data |
---|---|---|
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 | ||
aa5380b9 ON |
45 | MODULE_DEVICE_TABLE (usb, wdm_ids); |
46 | ||
afba937e ON |
47 | #define WDM_MINOR_BASE 176 |
48 | ||
49 | ||
50 | #define WDM_IN_USE 1 | |
51 | #define WDM_DISCONNECTING 2 | |
52 | #define WDM_RESULT 3 | |
53 | #define WDM_READ 4 | |
54 | #define WDM_INT_STALL 5 | |
55 | #define WDM_POLL_RUNNING 6 | |
56 | ||
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; | |
91 | struct mutex wlock; | |
92 | struct mutex rlock; | |
17d80d56 | 93 | struct mutex plock; |
afba937e ON |
94 | wait_queue_head_t wait; |
95 | struct work_struct rxwork; | |
96 | int werr; | |
97 | int rerr; | |
98 | }; | |
99 | ||
100 | static struct usb_driver wdm_driver; | |
101 | ||
102 | /* --- callbacks --- */ | |
103 | static void wdm_out_callback(struct urb *urb) | |
104 | { | |
105 | struct wdm_device *desc; | |
106 | desc = urb->context; | |
107 | spin_lock(&desc->iuspin); | |
108 | desc->werr = urb->status; | |
109 | spin_unlock(&desc->iuspin); | |
110 | clear_bit(WDM_IN_USE, &desc->flags); | |
111 | kfree(desc->outbuf); | |
112 | wake_up(&desc->wait); | |
113 | } | |
114 | ||
115 | static void wdm_in_callback(struct urb *urb) | |
116 | { | |
117 | struct wdm_device *desc = urb->context; | |
118 | int status = urb->status; | |
119 | ||
120 | spin_lock(&desc->iuspin); | |
121 | ||
122 | if (status) { | |
123 | switch (status) { | |
124 | case -ENOENT: | |
125 | dev_dbg(&desc->intf->dev, | |
126 | "nonzero urb status received: -ENOENT"); | |
127 | break; | |
128 | case -ECONNRESET: | |
129 | dev_dbg(&desc->intf->dev, | |
130 | "nonzero urb status received: -ECONNRESET"); | |
131 | break; | |
132 | case -ESHUTDOWN: | |
133 | dev_dbg(&desc->intf->dev, | |
134 | "nonzero urb status received: -ESHUTDOWN"); | |
135 | break; | |
136 | case -EPIPE: | |
9908a32e GKH |
137 | dev_err(&desc->intf->dev, |
138 | "nonzero urb status received: -EPIPE\n"); | |
afba937e ON |
139 | break; |
140 | default: | |
9908a32e GKH |
141 | dev_err(&desc->intf->dev, |
142 | "Unexpected error %d\n", status); | |
afba937e ON |
143 | break; |
144 | } | |
145 | } | |
146 | ||
147 | desc->rerr = status; | |
148 | desc->reslength = urb->actual_length; | |
149 | memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength); | |
150 | desc->length += desc->reslength; | |
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); | |
233 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
234 | rv = usb_submit_urb(desc->response, GFP_ATOMIC); | |
235 | dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d", | |
236 | __func__, rv); | |
237 | } | |
238 | spin_unlock(&desc->iuspin); | |
239 | if (rv < 0) { | |
240 | if (rv == -EPERM) | |
241 | return; | |
242 | if (rv == -ENOMEM) { | |
243 | sw: | |
244 | rv = schedule_work(&desc->rxwork); | |
245 | if (rv) | |
9908a32e GKH |
246 | dev_err(&desc->intf->dev, |
247 | "Cannot schedule work\n"); | |
afba937e ON |
248 | } |
249 | } | |
250 | exit: | |
251 | rv = usb_submit_urb(urb, GFP_ATOMIC); | |
252 | if (rv) | |
9908a32e GKH |
253 | dev_err(&desc->intf->dev, |
254 | "%s - usb_submit_urb failed with result %d\n", | |
255 | __func__, rv); | |
afba937e ON |
256 | |
257 | } | |
258 | ||
259 | static void kill_urbs(struct wdm_device *desc) | |
260 | { | |
17d80d56 | 261 | /* the order here is essential */ |
afba937e ON |
262 | usb_kill_urb(desc->command); |
263 | usb_kill_urb(desc->validity); | |
264 | usb_kill_urb(desc->response); | |
265 | } | |
266 | ||
267 | static void free_urbs(struct wdm_device *desc) | |
268 | { | |
269 | usb_free_urb(desc->validity); | |
270 | usb_free_urb(desc->response); | |
271 | usb_free_urb(desc->command); | |
272 | } | |
273 | ||
274 | static void cleanup(struct wdm_device *desc) | |
275 | { | |
276 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
277 | desc->wMaxPacketSize, | |
278 | desc->sbuf, | |
279 | desc->validity->transfer_dma); | |
280 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
87d65e54 | 281 | desc->wMaxCommand, |
afba937e ON |
282 | desc->inbuf, |
283 | desc->response->transfer_dma); | |
284 | kfree(desc->orq); | |
285 | kfree(desc->irq); | |
286 | kfree(desc->ubuf); | |
287 | free_urbs(desc); | |
288 | kfree(desc); | |
289 | } | |
290 | ||
291 | static ssize_t wdm_write | |
292 | (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
293 | { | |
294 | u8 *buf; | |
295 | int rv = -EMSGSIZE, r, we; | |
296 | struct wdm_device *desc = file->private_data; | |
297 | struct usb_ctrlrequest *req; | |
298 | ||
299 | if (count > desc->wMaxCommand) | |
300 | count = desc->wMaxCommand; | |
301 | ||
302 | spin_lock_irq(&desc->iuspin); | |
303 | we = desc->werr; | |
304 | desc->werr = 0; | |
305 | spin_unlock_irq(&desc->iuspin); | |
306 | if (we < 0) | |
307 | return -EIO; | |
308 | ||
309 | r = mutex_lock_interruptible(&desc->wlock); /* concurrent writes */ | |
310 | rv = -ERESTARTSYS; | |
311 | if (r) | |
312 | goto outnl; | |
313 | ||
17d80d56 ON |
314 | r = usb_autopm_get_interface(desc->intf); |
315 | if (r < 0) | |
316 | goto outnp; | |
afba937e ON |
317 | r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, |
318 | &desc->flags)); | |
319 | if (r < 0) | |
320 | goto out; | |
321 | ||
322 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
323 | rv = -ENODEV; | |
324 | goto out; | |
325 | } | |
326 | ||
327 | desc->outbuf = buf = kmalloc(count, GFP_KERNEL); | |
328 | if (!buf) { | |
329 | rv = -ENOMEM; | |
330 | goto out; | |
331 | } | |
332 | ||
333 | r = copy_from_user(buf, buffer, count); | |
334 | if (r > 0) { | |
335 | kfree(buf); | |
336 | rv = -EFAULT; | |
337 | goto out; | |
338 | } | |
339 | ||
340 | req = desc->orq; | |
341 | usb_fill_control_urb( | |
342 | desc->command, | |
343 | interface_to_usbdev(desc->intf), | |
344 | /* using common endpoint 0 */ | |
345 | usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), | |
346 | (unsigned char *)req, | |
347 | buf, | |
348 | count, | |
349 | wdm_out_callback, | |
350 | desc | |
351 | ); | |
352 | ||
353 | req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | | |
354 | USB_RECIP_INTERFACE); | |
355 | req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; | |
356 | req->wValue = 0; | |
357 | req->wIndex = desc->inum; | |
358 | req->wLength = cpu_to_le16(count); | |
359 | set_bit(WDM_IN_USE, &desc->flags); | |
360 | ||
361 | rv = usb_submit_urb(desc->command, GFP_KERNEL); | |
362 | if (rv < 0) { | |
363 | kfree(buf); | |
364 | clear_bit(WDM_IN_USE, &desc->flags); | |
9908a32e | 365 | dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); |
afba937e ON |
366 | } else { |
367 | dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", | |
368 | req->wIndex); | |
369 | } | |
370 | out: | |
17d80d56 ON |
371 | usb_autopm_put_interface(desc->intf); |
372 | outnp: | |
afba937e ON |
373 | mutex_unlock(&desc->wlock); |
374 | outnl: | |
375 | return rv < 0 ? rv : count; | |
376 | } | |
377 | ||
378 | static ssize_t wdm_read | |
379 | (struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
380 | { | |
381 | int rv, cntr; | |
382 | int i = 0; | |
383 | struct wdm_device *desc = file->private_data; | |
384 | ||
385 | ||
386 | rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ | |
387 | if (rv < 0) | |
388 | return -ERESTARTSYS; | |
389 | ||
390 | if (desc->length == 0) { | |
391 | desc->read = 0; | |
392 | retry: | |
393 | i++; | |
394 | rv = wait_event_interruptible(desc->wait, | |
395 | test_bit(WDM_READ, &desc->flags)); | |
396 | ||
17d80d56 ON |
397 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
398 | rv = -ENODEV; | |
399 | goto err; | |
400 | } | |
401 | usb_mark_last_busy(interface_to_usbdev(desc->intf)); | |
afba937e ON |
402 | if (rv < 0) { |
403 | rv = -ERESTARTSYS; | |
404 | goto err; | |
405 | } | |
406 | ||
407 | spin_lock_irq(&desc->iuspin); | |
408 | ||
409 | if (desc->rerr) { /* read completed, error happened */ | |
410 | int t = desc->rerr; | |
411 | desc->rerr = 0; | |
412 | spin_unlock_irq(&desc->iuspin); | |
9908a32e GKH |
413 | dev_err(&desc->intf->dev, |
414 | "reading had resulted in %d\n", t); | |
afba937e ON |
415 | rv = -EIO; |
416 | goto err; | |
417 | } | |
418 | /* | |
419 | * recheck whether we've lost the race | |
420 | * against the completion handler | |
421 | */ | |
422 | if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ | |
423 | spin_unlock_irq(&desc->iuspin); | |
424 | goto retry; | |
425 | } | |
426 | if (!desc->reslength) { /* zero length read */ | |
427 | spin_unlock_irq(&desc->iuspin); | |
428 | goto retry; | |
429 | } | |
430 | clear_bit(WDM_READ, &desc->flags); | |
431 | spin_unlock_irq(&desc->iuspin); | |
432 | } | |
433 | ||
434 | cntr = count > desc->length ? desc->length : count; | |
435 | rv = copy_to_user(buffer, desc->ubuf, cntr); | |
436 | if (rv > 0) { | |
437 | rv = -EFAULT; | |
438 | goto err; | |
439 | } | |
440 | ||
441 | for (i = 0; i < desc->length - cntr; i++) | |
442 | desc->ubuf[i] = desc->ubuf[i + cntr]; | |
443 | ||
444 | desc->length -= cntr; | |
87d65e54 ON |
445 | /* in case we had outstanding data */ |
446 | if (!desc->length) | |
447 | clear_bit(WDM_READ, &desc->flags); | |
afba937e ON |
448 | rv = cntr; |
449 | ||
450 | err: | |
451 | mutex_unlock(&desc->rlock); | |
452 | if (rv < 0) | |
9908a32e | 453 | dev_err(&desc->intf->dev, "wdm_read: exit error\n"); |
afba937e ON |
454 | return rv; |
455 | } | |
456 | ||
457 | static int wdm_flush(struct file *file, fl_owner_t id) | |
458 | { | |
459 | struct wdm_device *desc = file->private_data; | |
460 | ||
461 | wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); | |
462 | if (desc->werr < 0) | |
9908a32e GKH |
463 | dev_err(&desc->intf->dev, "Error in flush path: %d\n", |
464 | desc->werr); | |
afba937e ON |
465 | |
466 | return desc->werr; | |
467 | } | |
468 | ||
469 | static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) | |
470 | { | |
471 | struct wdm_device *desc = file->private_data; | |
472 | unsigned long flags; | |
473 | unsigned int mask = 0; | |
474 | ||
475 | spin_lock_irqsave(&desc->iuspin, flags); | |
476 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
477 | mask = POLLERR; | |
478 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
479 | goto desc_out; | |
480 | } | |
481 | if (test_bit(WDM_READ, &desc->flags)) | |
482 | mask = POLLIN | POLLRDNORM; | |
483 | if (desc->rerr || desc->werr) | |
484 | mask |= POLLERR; | |
485 | if (!test_bit(WDM_IN_USE, &desc->flags)) | |
486 | mask |= POLLOUT | POLLWRNORM; | |
487 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
488 | ||
489 | poll_wait(file, &desc->wait, wait); | |
490 | ||
491 | desc_out: | |
492 | return mask; | |
493 | } | |
494 | ||
495 | static int wdm_open(struct inode *inode, struct file *file) | |
496 | { | |
497 | int minor = iminor(inode); | |
498 | int rv = -ENODEV; | |
499 | struct usb_interface *intf; | |
500 | struct wdm_device *desc; | |
501 | ||
502 | mutex_lock(&wdm_mutex); | |
503 | intf = usb_find_interface(&wdm_driver, minor); | |
504 | if (!intf) | |
505 | goto out; | |
506 | ||
507 | desc = usb_get_intfdata(intf); | |
508 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) | |
509 | goto out; | |
510 | ||
17d80d56 | 511 | ; |
afba937e ON |
512 | file->private_data = desc; |
513 | ||
17d80d56 | 514 | rv = usb_autopm_get_interface(desc->intf); |
afba937e | 515 | if (rv < 0) { |
9908a32e | 516 | dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); |
afba937e ON |
517 | goto out; |
518 | } | |
17d80d56 | 519 | intf->needs_remote_wakeup = 1; |
afba937e | 520 | |
17d80d56 ON |
521 | mutex_lock(&desc->plock); |
522 | if (!desc->count++) { | |
523 | rv = usb_submit_urb(desc->validity, GFP_KERNEL); | |
524 | if (rv < 0) { | |
525 | desc->count--; | |
9908a32e GKH |
526 | dev_err(&desc->intf->dev, |
527 | "Error submitting int urb - %d\n", rv); | |
17d80d56 ON |
528 | } |
529 | } else { | |
530 | rv = 0; | |
531 | } | |
532 | mutex_unlock(&desc->plock); | |
533 | usb_autopm_put_interface(desc->intf); | |
afba937e ON |
534 | out: |
535 | mutex_unlock(&wdm_mutex); | |
536 | return rv; | |
537 | } | |
538 | ||
539 | static int wdm_release(struct inode *inode, struct file *file) | |
540 | { | |
541 | struct wdm_device *desc = file->private_data; | |
542 | ||
543 | mutex_lock(&wdm_mutex); | |
17d80d56 | 544 | mutex_lock(&desc->plock); |
afba937e | 545 | desc->count--; |
17d80d56 ON |
546 | mutex_unlock(&desc->plock); |
547 | ||
afba937e ON |
548 | if (!desc->count) { |
549 | dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); | |
550 | kill_urbs(desc); | |
17d80d56 ON |
551 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
552 | desc->intf->needs_remote_wakeup = 0; | |
afba937e ON |
553 | } |
554 | mutex_unlock(&wdm_mutex); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | static const struct file_operations wdm_fops = { | |
559 | .owner = THIS_MODULE, | |
560 | .read = wdm_read, | |
561 | .write = wdm_write, | |
562 | .open = wdm_open, | |
563 | .flush = wdm_flush, | |
564 | .release = wdm_release, | |
565 | .poll = wdm_poll | |
566 | }; | |
567 | ||
568 | static struct usb_class_driver wdm_class = { | |
569 | .name = "cdc-wdm%d", | |
570 | .fops = &wdm_fops, | |
571 | .minor_base = WDM_MINOR_BASE, | |
572 | }; | |
573 | ||
574 | /* --- error handling --- */ | |
575 | static void wdm_rxwork(struct work_struct *work) | |
576 | { | |
577 | struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); | |
578 | unsigned long flags; | |
579 | int rv; | |
580 | ||
581 | spin_lock_irqsave(&desc->iuspin, flags); | |
582 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
583 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
584 | } else { | |
585 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
586 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
587 | if (rv < 0 && rv != -EPERM) { | |
588 | spin_lock_irqsave(&desc->iuspin, flags); | |
589 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) | |
590 | schedule_work(&desc->rxwork); | |
591 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
592 | } | |
593 | } | |
594 | } | |
595 | ||
596 | /* --- hotplug --- */ | |
597 | ||
598 | static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
599 | { | |
600 | int rv = -EINVAL; | |
601 | struct usb_device *udev = interface_to_usbdev(intf); | |
602 | struct wdm_device *desc; | |
603 | struct usb_host_interface *iface; | |
604 | struct usb_endpoint_descriptor *ep; | |
605 | struct usb_cdc_dmm_desc *dmhd; | |
606 | u8 *buffer = intf->altsetting->extra; | |
607 | int buflen = intf->altsetting->extralen; | |
608 | u16 maxcom = 0; | |
609 | ||
610 | if (!buffer) | |
611 | goto out; | |
612 | ||
613 | while (buflen > 0) { | |
614 | if (buffer [1] != USB_DT_CS_INTERFACE) { | |
9908a32e | 615 | dev_err(&intf->dev, "skipping garbage\n"); |
afba937e ON |
616 | goto next_desc; |
617 | } | |
618 | ||
619 | switch (buffer [2]) { | |
620 | case USB_CDC_HEADER_TYPE: | |
621 | break; | |
622 | case USB_CDC_DMM_TYPE: | |
623 | dmhd = (struct usb_cdc_dmm_desc *)buffer; | |
624 | maxcom = le16_to_cpu(dmhd->wMaxCommand); | |
625 | dev_dbg(&intf->dev, | |
626 | "Finding maximum buffer length: %d", maxcom); | |
627 | break; | |
628 | default: | |
9908a32e GKH |
629 | dev_err(&intf->dev, |
630 | "Ignoring extra header, type %d, length %d\n", | |
afba937e ON |
631 | buffer[2], buffer[0]); |
632 | break; | |
633 | } | |
634 | next_desc: | |
635 | buflen -= buffer[0]; | |
636 | buffer += buffer[0]; | |
637 | } | |
638 | ||
639 | rv = -ENOMEM; | |
640 | desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); | |
641 | if (!desc) | |
642 | goto out; | |
643 | mutex_init(&desc->wlock); | |
644 | mutex_init(&desc->rlock); | |
17d80d56 | 645 | mutex_init(&desc->plock); |
afba937e ON |
646 | spin_lock_init(&desc->iuspin); |
647 | init_waitqueue_head(&desc->wait); | |
648 | desc->wMaxCommand = maxcom; | |
649 | desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); | |
650 | desc->intf = intf; | |
651 | INIT_WORK(&desc->rxwork, wdm_rxwork); | |
652 | ||
653 | iface = &intf->altsetting[0]; | |
654 | ep = &iface->endpoint[0].desc; | |
655 | if (!usb_endpoint_is_int_in(ep)) { | |
656 | rv = -EINVAL; | |
657 | goto err; | |
658 | } | |
659 | ||
fa4144b7 AV |
660 | desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize); |
661 | desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0; | |
afba937e ON |
662 | |
663 | desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
664 | if (!desc->orq) | |
665 | goto err; | |
666 | desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
667 | if (!desc->irq) | |
668 | goto err; | |
669 | ||
670 | desc->validity = usb_alloc_urb(0, GFP_KERNEL); | |
671 | if (!desc->validity) | |
672 | goto err; | |
673 | ||
674 | desc->response = usb_alloc_urb(0, GFP_KERNEL); | |
675 | if (!desc->response) | |
676 | goto err; | |
677 | ||
678 | desc->command = usb_alloc_urb(0, GFP_KERNEL); | |
679 | if (!desc->command) | |
680 | goto err; | |
681 | ||
682 | desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); | |
683 | if (!desc->ubuf) | |
684 | goto err; | |
685 | ||
686 | desc->sbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
687 | desc->wMaxPacketSize, | |
688 | GFP_KERNEL, | |
689 | &desc->validity->transfer_dma); | |
690 | if (!desc->sbuf) | |
691 | goto err; | |
692 | ||
693 | desc->inbuf = usb_buffer_alloc(interface_to_usbdev(intf), | |
694 | desc->bMaxPacketSize0, | |
695 | GFP_KERNEL, | |
696 | &desc->response->transfer_dma); | |
697 | if (!desc->inbuf) | |
698 | goto err2; | |
699 | ||
700 | usb_fill_int_urb( | |
701 | desc->validity, | |
702 | interface_to_usbdev(intf), | |
703 | usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), | |
704 | desc->sbuf, | |
705 | desc->wMaxPacketSize, | |
706 | wdm_int_callback, | |
707 | desc, | |
708 | ep->bInterval | |
709 | ); | |
710 | desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
711 | ||
712 | usb_set_intfdata(intf, desc); | |
713 | rv = usb_register_dev(intf, &wdm_class); | |
714 | dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n", | |
715 | intf->minor - WDM_MINOR_BASE); | |
716 | if (rv < 0) | |
717 | goto err; | |
718 | out: | |
719 | return rv; | |
720 | err2: | |
721 | usb_buffer_free(interface_to_usbdev(desc->intf), | |
722 | desc->wMaxPacketSize, | |
723 | desc->sbuf, | |
724 | desc->validity->transfer_dma); | |
725 | err: | |
726 | free_urbs(desc); | |
727 | kfree(desc->ubuf); | |
728 | kfree(desc->orq); | |
729 | kfree(desc->irq); | |
730 | kfree(desc); | |
731 | return rv; | |
732 | } | |
733 | ||
734 | static void wdm_disconnect(struct usb_interface *intf) | |
735 | { | |
736 | struct wdm_device *desc; | |
737 | unsigned long flags; | |
738 | ||
739 | usb_deregister_dev(intf, &wdm_class); | |
740 | mutex_lock(&wdm_mutex); | |
741 | desc = usb_get_intfdata(intf); | |
742 | ||
743 | /* the spinlock makes sure no new urbs are generated in the callbacks */ | |
744 | spin_lock_irqsave(&desc->iuspin, flags); | |
745 | set_bit(WDM_DISCONNECTING, &desc->flags); | |
746 | set_bit(WDM_READ, &desc->flags); | |
17d80d56 | 747 | /* to terminate pending flushes */ |
afba937e ON |
748 | clear_bit(WDM_IN_USE, &desc->flags); |
749 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
750 | cancel_work_sync(&desc->rxwork); | |
751 | kill_urbs(desc); | |
752 | wake_up_all(&desc->wait); | |
753 | if (!desc->count) | |
754 | cleanup(desc); | |
755 | mutex_unlock(&wdm_mutex); | |
756 | } | |
757 | ||
17d80d56 ON |
758 | static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
759 | { | |
760 | struct wdm_device *desc = usb_get_intfdata(intf); | |
761 | int rv = 0; | |
762 | ||
763 | dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); | |
764 | ||
765 | mutex_lock(&desc->plock); | |
35758589 | 766 | #ifdef CONFIG_PM |
17d80d56 ON |
767 | if (interface_to_usbdev(desc->intf)->auto_pm && test_bit(WDM_IN_USE, &desc->flags)) { |
768 | rv = -EBUSY; | |
769 | } else { | |
35758589 | 770 | #endif |
17d80d56 ON |
771 | cancel_work_sync(&desc->rxwork); |
772 | kill_urbs(desc); | |
35758589 | 773 | #ifdef CONFIG_PM |
17d80d56 | 774 | } |
35758589 | 775 | #endif |
17d80d56 ON |
776 | mutex_unlock(&desc->plock); |
777 | ||
778 | return rv; | |
779 | } | |
780 | ||
781 | static int recover_from_urb_loss(struct wdm_device *desc) | |
782 | { | |
783 | int rv = 0; | |
784 | ||
785 | if (desc->count) { | |
786 | rv = usb_submit_urb(desc->validity, GFP_NOIO); | |
787 | if (rv < 0) | |
9908a32e GKH |
788 | dev_err(&desc->intf->dev, |
789 | "Error resume submitting int urb - %d\n", rv); | |
17d80d56 ON |
790 | } |
791 | return rv; | |
792 | } | |
793 | static int wdm_resume(struct usb_interface *intf) | |
794 | { | |
795 | struct wdm_device *desc = usb_get_intfdata(intf); | |
796 | int rv; | |
797 | ||
798 | dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); | |
799 | mutex_lock(&desc->plock); | |
800 | rv = recover_from_urb_loss(desc); | |
801 | mutex_unlock(&desc->plock); | |
802 | return rv; | |
803 | } | |
804 | ||
805 | static int wdm_pre_reset(struct usb_interface *intf) | |
806 | { | |
807 | struct wdm_device *desc = usb_get_intfdata(intf); | |
808 | ||
809 | mutex_lock(&desc->plock); | |
810 | return 0; | |
811 | } | |
812 | ||
813 | static int wdm_post_reset(struct usb_interface *intf) | |
814 | { | |
815 | struct wdm_device *desc = usb_get_intfdata(intf); | |
816 | int rv; | |
817 | ||
818 | rv = recover_from_urb_loss(desc); | |
819 | mutex_unlock(&desc->plock); | |
820 | return 0; | |
821 | } | |
822 | ||
afba937e ON |
823 | static struct usb_driver wdm_driver = { |
824 | .name = "cdc_wdm", | |
825 | .probe = wdm_probe, | |
826 | .disconnect = wdm_disconnect, | |
17d80d56 ON |
827 | .suspend = wdm_suspend, |
828 | .resume = wdm_resume, | |
829 | .reset_resume = wdm_resume, | |
830 | .pre_reset = wdm_pre_reset, | |
831 | .post_reset = wdm_post_reset, | |
afba937e | 832 | .id_table = wdm_ids, |
17d80d56 | 833 | .supports_autosuspend = 1, |
afba937e ON |
834 | }; |
835 | ||
836 | /* --- low level module stuff --- */ | |
837 | ||
838 | static int __init wdm_init(void) | |
839 | { | |
840 | int rv; | |
841 | ||
842 | rv = usb_register(&wdm_driver); | |
843 | ||
844 | return rv; | |
845 | } | |
846 | ||
847 | static void __exit wdm_exit(void) | |
848 | { | |
849 | usb_deregister(&wdm_driver); | |
850 | } | |
851 | ||
852 | module_init(wdm_init); | |
853 | module_exit(wdm_exit); | |
854 | ||
855 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
87d65e54 | 856 | MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e | 857 | MODULE_LICENSE("GPL"); |