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usb: include module.h in the DesignWare USB3 DRD driver
[deliverable/linux.git] / drivers / usb / class / cdc-wdm.c
CommitLineData
afba937e
ON		 1/*
2 * cdc-wdm.c
3 *
4 * This driver supports USB CDC WCM Device Management.
5 *
052fbc0d 6 * Copyright (c) 2007-2009 Oliver Neukum
afba937e
ON		 7 *
8 * Some code taken from cdc-acm.c
9 *
10 * Released under the GPLv2.
11 *
12 * Many thanks to Carl Nordbeck
13 */
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/module.h>
afba937e
ON		 18#include <linux/mutex.h>
19#include <linux/uaccess.h>
20#include <linux/bitops.h>
21#include <linux/poll.h>
22#include <linux/usb.h>
23#include <linux/usb/cdc.h>
24#include <asm/byteorder.h>
25#include <asm/unaligned.h>
26
27/*
28 * Version Information
29 */
87d65e54 30#define DRIVER_VERSION "v0.03"
afba937e 31#define DRIVER_AUTHOR "Oliver Neukum"
87d65e54 32#define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management"
afba937e 33
6ef4852b 34static const struct usb_device_id wdm_ids[] = {
afba937e
ON		 35 {
36 .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
37 USB_DEVICE_ID_MATCH_INT_SUBCLASS,
38 .bInterfaceClass = USB_CLASS_COMM,
39 .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM
40 },
41 { }
42};
43
aa5380b9
ON		 44MODULE_DEVICE_TABLE (usb, wdm_ids);
45
afba937e
ON		 46#define WDM_MINOR_BASE 176
47
48
49#define WDM_IN_USE 1
50#define WDM_DISCONNECTING 2
51#define WDM_RESULT 3
52#define WDM_READ 4
53#define WDM_INT_STALL 5
54#define WDM_POLL_RUNNING 6
922a5ead 55#define WDM_RESPONDING 7
beb1d35f 56#define WDM_SUSPENDING 8
afba937e
ON		 57
58#define WDM_MAX 16
59
60
61static DEFINE_MUTEX(wdm_mutex);
62
63/* --- method tables --- */
64
65struct wdm_device {
66 u8 *inbuf; /* buffer for response */
67 u8 *outbuf; /* buffer for command */
68 u8 *sbuf; /* buffer for status */
69 u8 *ubuf; /* buffer for copy to user space */
70
71 struct urb *command;
72 struct urb *response;
73 struct urb *validity;
74 struct usb_interface *intf;
75 struct usb_ctrlrequest *orq;
76 struct usb_ctrlrequest *irq;
77 spinlock_t iuspin;
78
79 unsigned long flags;
80 u16 bufsize;
81 u16 wMaxCommand;
82 u16 wMaxPacketSize;
83 u16 bMaxPacketSize0;
84 __le16 inum;
85 int reslength;
86 int length;
87 int read;
88 int count;
89 dma_addr_t shandle;
90 dma_addr_t ihandle;
860e41a7 91 struct mutex lock;
afba937e
ON		 92 wait_queue_head_t wait;
93 struct work_struct rxwork;
94 int werr;
95 int rerr;
96};
97
98static struct usb_driver wdm_driver;
99
100/* --- callbacks --- */
101static 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
113static void wdm_in_callback(struct urb *urb)
114{
115 struct wdm_device *desc = urb->context;
116 int status = urb->status;
117
118 spin_lock(&desc->iuspin);
922a5ead 119 clear_bit(WDM_RESPONDING, &desc->flags);
afba937e
ON		 120
121 if (status) {
122 switch (status) {
123 case -ENOENT:
124 dev_dbg(&desc->intf->dev,
125 "nonzero urb status received: -ENOENT");
922a5ead 126 goto skip_error;
afba937e
ON		 127 case -ECONNRESET:
128 dev_dbg(&desc->intf->dev,
129 "nonzero urb status received: -ECONNRESET");
922a5ead 130 goto skip_error;
afba937e
ON		 131 case -ESHUTDOWN:
132 dev_dbg(&desc->intf->dev,
133 "nonzero urb status received: -ESHUTDOWN");
922a5ead 134 goto skip_error;
afba937e 135 case -EPIPE:
9908a32e
GKH		 136 dev_err(&desc->intf->dev,
137 "nonzero urb status received: -EPIPE\n");
afba937e
ON		 138 break;
139 default:
9908a32e
GKH		 140 dev_err(&desc->intf->dev,
141 "Unexpected error %d\n", status);
afba937e
ON		 142 break;
143 }
144 }
145
146 desc->rerr = status;
147 desc->reslength = urb->actual_length;
148 memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength);
149 desc->length += desc->reslength;
922a5ead 150skip_error:
afba937e
ON		 151 wake_up(&desc->wait);
152
153 set_bit(WDM_READ, &desc->flags);
154 spin_unlock(&desc->iuspin);
155}
156
157static void wdm_int_callback(struct urb *urb)
158{
159 int rv = 0;
160 int status = urb->status;
161 struct wdm_device *desc;
162 struct usb_ctrlrequest *req;
163 struct usb_cdc_notification *dr;
164
165 desc = urb->context;
166 req = desc->irq;
167 dr = (struct usb_cdc_notification *)desc->sbuf;
168
169 if (status) {
170 switch (status) {
171 case -ESHUTDOWN:
172 case -ENOENT:
173 case -ECONNRESET:
174 return; /* unplug */
175 case -EPIPE:
176 set_bit(WDM_INT_STALL, &desc->flags);
9908a32e 177 dev_err(&desc->intf->dev, "Stall on int endpoint\n");
afba937e
ON		 178 goto sw; /* halt is cleared in work */
179 default:
9908a32e
GKH		 180 dev_err(&desc->intf->dev,
181 "nonzero urb status received: %d\n", status);
afba937e
ON		 182 break;
183 }
184 }
185
186 if (urb->actual_length < sizeof(struct usb_cdc_notification)) {
9908a32e
GKH		 187 dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n",
188 urb->actual_length);
afba937e
ON		 189 goto exit;
190 }
191
192 switch (dr->bNotificationType) {
193 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
194 dev_dbg(&desc->intf->dev,
195 "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d",
196 dr->wIndex, dr->wLength);
197 break;
198
199 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
200
201 dev_dbg(&desc->intf->dev,
202 "NOTIFY_NETWORK_CONNECTION %s network",
203 dr->wValue ? "connected to" : "disconnected from");
204 goto exit;
205 default:
206 clear_bit(WDM_POLL_RUNNING, &desc->flags);
9908a32e
GKH		 207 dev_err(&desc->intf->dev,
208 "unknown notification %d received: index %d len %d\n",
afba937e
ON		 209 dr->bNotificationType, dr->wIndex, dr->wLength);
210 goto exit;
211 }
212
213 req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
214 req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
215 req->wValue = 0;
216 req->wIndex = desc->inum;
87d65e54 217 req->wLength = cpu_to_le16(desc->wMaxCommand);
afba937e
ON		 218
219 usb_fill_control_urb(
220 desc->response,
221 interface_to_usbdev(desc->intf),
222 /* using common endpoint 0 */
223 usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
224 (unsigned char *)req,
225 desc->inbuf,
87d65e54 226 desc->wMaxCommand,
afba937e
ON		 227 wdm_in_callback,
228 desc
229 );
230 desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
231 spin_lock(&desc->iuspin);
232 clear_bit(WDM_READ, &desc->flags);
922a5ead 233 set_bit(WDM_RESPONDING, &desc->flags);
beb1d35f
ON		 234 if (!test_bit(WDM_DISCONNECTING, &desc->flags)
235 && !test_bit(WDM_SUSPENDING, &desc->flags)) {
afba937e
ON		 236 rv = usb_submit_urb(desc->response, GFP_ATOMIC);
237 dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d",
238 __func__, rv);
239 }
240 spin_unlock(&desc->iuspin);
241 if (rv < 0) {
922a5ead 242 clear_bit(WDM_RESPONDING, &desc->flags);
afba937e
ON		 243 if (rv == -EPERM)
244 return;
245 if (rv == -ENOMEM) {
246sw:
247 rv = schedule_work(&desc->rxwork);
248 if (rv)
9908a32e
GKH		 249 dev_err(&desc->intf->dev,
250 "Cannot schedule work\n");
afba937e
ON		 251 }
252 }
253exit:
254 rv = usb_submit_urb(urb, GFP_ATOMIC);
255 if (rv)
9908a32e
GKH		 256 dev_err(&desc->intf->dev,
257 "%s - usb_submit_urb failed with result %d\n",
258 __func__, rv);
afba937e
ON		 259
260}
261
262static void kill_urbs(struct wdm_device *desc)
263{
17d80d56 264 /* the order here is essential */
afba937e
ON		 265 usb_kill_urb(desc->command);
266 usb_kill_urb(desc->validity);
267 usb_kill_urb(desc->response);
268}
269
270static void free_urbs(struct wdm_device *desc)
271{
272 usb_free_urb(desc->validity);
273 usb_free_urb(desc->response);
274 usb_free_urb(desc->command);
275}
276
277static void cleanup(struct wdm_device *desc)
278{
997ea58e
DM		 279 usb_free_coherent(interface_to_usbdev(desc->intf),
280 desc->wMaxPacketSize,
281 desc->sbuf,
282 desc->validity->transfer_dma);
283 usb_free_coherent(interface_to_usbdev(desc->intf),
878b753e 284 desc->bMaxPacketSize0,
997ea58e
DM		 285 desc->inbuf,
286 desc->response->transfer_dma);
afba937e
ON		 287 kfree(desc->orq);
288 kfree(desc->irq);
289 kfree(desc->ubuf);
290 free_urbs(desc);
291 kfree(desc);
292}
293
294static ssize_t wdm_write
295(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
296{
297 u8 *buf;
298 int rv = -EMSGSIZE, r, we;
299 struct wdm_device *desc = file->private_data;
300 struct usb_ctrlrequest *req;
301
302 if (count > desc->wMaxCommand)
303 count = desc->wMaxCommand;
304
305 spin_lock_irq(&desc->iuspin);
306 we = desc->werr;
307 desc->werr = 0;
308 spin_unlock_irq(&desc->iuspin);
309 if (we < 0)
310 return -EIO;
311
860e41a7
ON		 312 desc->outbuf = buf = kmalloc(count, GFP_KERNEL);
313 if (!buf) {
314 rv = -ENOMEM;
315 goto outnl;
316 }
317
318 r = copy_from_user(buf, buffer, count);
319 if (r > 0) {
320 kfree(buf);
321 rv = -EFAULT;
322 goto outnl;
323 }
324
325 /* concurrent writes and disconnect */
326 r = mutex_lock_interruptible(&desc->lock);
afba937e 327 rv = -ERESTARTSYS;
860e41a7
ON		 328 if (r) {
329 kfree(buf);
afba937e 330 goto outnl;
860e41a7
ON		 331 }
332
333 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
334 kfree(buf);
335 rv = -ENODEV;
336 goto outnp;
337 }
afba937e 338
17d80d56 339 r = usb_autopm_get_interface(desc->intf);
860e41a7
ON		 340 if (r < 0) {
341 kfree(buf);
17d80d56 342 goto outnp;
860e41a7 343 }
7f1dc313 344
0cdfb819 345 if (!(file->f_flags & O_NONBLOCK))
7f1dc313
ON		 346 r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE,
347 &desc->flags));
348 else
349 if (test_bit(WDM_IN_USE, &desc->flags))
350 r = -EAGAIN;
860e41a7 351 if (r < 0) {
afba937e 352 kfree(buf);
afba937e
ON		 353 goto out;
354 }
355
356 req = desc->orq;
357 usb_fill_control_urb(
358 desc->command,
359 interface_to_usbdev(desc->intf),
360 /* using common endpoint 0 */
361 usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0),
362 (unsigned char *)req,
363 buf,
364 count,
365 wdm_out_callback,
366 desc
367 );
368
369 req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS |
370 USB_RECIP_INTERFACE);
371 req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
372 req->wValue = 0;
373 req->wIndex = desc->inum;
374 req->wLength = cpu_to_le16(count);
375 set_bit(WDM_IN_USE, &desc->flags);
376
377 rv = usb_submit_urb(desc->command, GFP_KERNEL);
378 if (rv < 0) {
379 kfree(buf);
380 clear_bit(WDM_IN_USE, &desc->flags);
9908a32e 381 dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv);
afba937e
ON		 382 } else {
383 dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d",
384 req->wIndex);
385 }
386out:
17d80d56
ON		 387 usb_autopm_put_interface(desc->intf);
388outnp:
860e41a7 389 mutex_unlock(&desc->lock);
afba937e
ON		 390outnl:
391 return rv < 0 ? rv : count;
392}
393
394static ssize_t wdm_read
395(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
396{
7f1dc313 397 int rv, cntr = 0;
afba937e
ON		 398 int i = 0;
399 struct wdm_device *desc = file->private_data;
400
401
860e41a7 402 rv = mutex_lock_interruptible(&desc->lock); /*concurrent reads */
afba937e
ON		 403 if (rv < 0)
404 return -ERESTARTSYS;
405
406 if (desc->length == 0) {
407 desc->read = 0;
408retry:
7f1dc313
ON		 409 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
410 rv = -ENODEV;
411 goto err;
412 }
afba937e 413 i++;
7f1dc313
ON		 414 if (file->f_flags & O_NONBLOCK) {
415 if (!test_bit(WDM_READ, &desc->flags)) {
416 rv = cntr ? cntr : -EAGAIN;
417 goto err;
418 }
419 rv = 0;
420 } else {
421 rv = wait_event_interruptible(desc->wait,
422 test_bit(WDM_READ, &desc->flags));
423 }
afba937e 424
7f1dc313 425 /* may have happened while we slept */
17d80d56
ON		 426 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
427 rv = -ENODEV;
428 goto err;
429 }
430 usb_mark_last_busy(interface_to_usbdev(desc->intf));
afba937e
ON		 431 if (rv < 0) {
432 rv = -ERESTARTSYS;
433 goto err;
434 }
435
436 spin_lock_irq(&desc->iuspin);
437
438 if (desc->rerr) { /* read completed, error happened */
afba937e
ON		 439 desc->rerr = 0;
440 spin_unlock_irq(&desc->iuspin);
afba937e
ON		 441 rv = -EIO;
442 goto err;
443 }
444 /*
445 * recheck whether we've lost the race
446 * against the completion handler
447 */
448 if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */
449 spin_unlock_irq(&desc->iuspin);
450 goto retry;
451 }
452 if (!desc->reslength) { /* zero length read */
453 spin_unlock_irq(&desc->iuspin);
454 goto retry;
455 }
456 clear_bit(WDM_READ, &desc->flags);
457 spin_unlock_irq(&desc->iuspin);
458 }
459
460 cntr = count > desc->length ? desc->length : count;
461 rv = copy_to_user(buffer, desc->ubuf, cntr);
462 if (rv > 0) {
463 rv = -EFAULT;
464 goto err;
465 }
466
467 for (i = 0; i < desc->length - cntr; i++)
468 desc->ubuf[i] = desc->ubuf[i + cntr];
469
470 desc->length -= cntr;
87d65e54
ON		 471 /* in case we had outstanding data */
472 if (!desc->length)
473 clear_bit(WDM_READ, &desc->flags);
afba937e
ON		 474 rv = cntr;
475
476err:
860e41a7 477 mutex_unlock(&desc->lock);
afba937e
ON		 478 return rv;
479}
480
481static int wdm_flush(struct file *file, fl_owner_t id)
482{
483 struct wdm_device *desc = file->private_data;
484
485 wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags));
486 if (desc->werr < 0)
9908a32e
GKH		 487 dev_err(&desc->intf->dev, "Error in flush path: %d\n",
488 desc->werr);
afba937e
ON		 489
490 return desc->werr;
491}
492
493static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait)
494{
495 struct wdm_device *desc = file->private_data;
496 unsigned long flags;
497 unsigned int mask = 0;
498
499 spin_lock_irqsave(&desc->iuspin, flags);
500 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
501 mask = POLLERR;
502 spin_unlock_irqrestore(&desc->iuspin, flags);
503 goto desc_out;
504 }
505 if (test_bit(WDM_READ, &desc->flags))
506 mask = POLLIN | POLLRDNORM;
507 if (desc->rerr || desc->werr)
508 mask |= POLLERR;
509 if (!test_bit(WDM_IN_USE, &desc->flags))
510 mask |= POLLOUT | POLLWRNORM;
511 spin_unlock_irqrestore(&desc->iuspin, flags);
512
513 poll_wait(file, &desc->wait, wait);
514
515desc_out:
516 return mask;
517}
518
519static int wdm_open(struct inode *inode, struct file *file)
520{
521 int minor = iminor(inode);
522 int rv = -ENODEV;
523 struct usb_interface *intf;
524 struct wdm_device *desc;
525
526 mutex_lock(&wdm_mutex);
527 intf = usb_find_interface(&wdm_driver, minor);
528 if (!intf)
529 goto out;
530
531 desc = usb_get_intfdata(intf);
532 if (test_bit(WDM_DISCONNECTING, &desc->flags))
533 goto out;
afba937e
ON		 534 file->private_data = desc;
535
17d80d56 536 rv = usb_autopm_get_interface(desc->intf);
afba937e 537 if (rv < 0) {
9908a32e 538 dev_err(&desc->intf->dev, "Error autopm - %d\n", rv);
afba937e
ON		 539 goto out;
540 }
17d80d56 541 intf->needs_remote_wakeup = 1;
afba937e 542
860e41a7 543 mutex_lock(&desc->lock);
17d80d56 544 if (!desc->count++) {
d771d8aa
ON		 545 desc->werr = 0;
546 desc->rerr = 0;
17d80d56
ON		 547 rv = usb_submit_urb(desc->validity, GFP_KERNEL);
548 if (rv < 0) {
549 desc->count--;
9908a32e
GKH		 550 dev_err(&desc->intf->dev,
551 "Error submitting int urb - %d\n", rv);
17d80d56
ON		 552 }
553 } else {
554 rv = 0;
555 }
860e41a7 556 mutex_unlock(&desc->lock);
17d80d56 557 usb_autopm_put_interface(desc->intf);
afba937e
ON		 558out:
559 mutex_unlock(&wdm_mutex);
560 return rv;
561}
562
563static int wdm_release(struct inode *inode, struct file *file)
564{
565 struct wdm_device *desc = file->private_data;
566
567 mutex_lock(&wdm_mutex);
860e41a7 568 mutex_lock(&desc->lock);
afba937e 569 desc->count--;
860e41a7 570 mutex_unlock(&desc->lock);
17d80d56 571
afba937e
ON		 572 if (!desc->count) {
573 dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
574 kill_urbs(desc);
17d80d56
ON		 575 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
576 desc->intf->needs_remote_wakeup = 0;
afba937e
ON		 577 }
578 mutex_unlock(&wdm_mutex);
579 return 0;
580}
581
582static const struct file_operations wdm_fops = {
583 .owner = THIS_MODULE,
584 .read = wdm_read,
585 .write = wdm_write,
586 .open = wdm_open,
587 .flush = wdm_flush,
588 .release = wdm_release,
6038f373
AB		 589 .poll = wdm_poll,
590 .llseek = noop_llseek,
afba937e
ON		 591};
592
593static struct usb_class_driver wdm_class = {
594 .name = "cdc-wdm%d",
595 .fops = &wdm_fops,
596 .minor_base = WDM_MINOR_BASE,
597};
598
599/* --- error handling --- */
600static void wdm_rxwork(struct work_struct *work)
601{
602 struct wdm_device *desc = container_of(work, struct wdm_device, rxwork);
603 unsigned long flags;
604 int rv;
605
606 spin_lock_irqsave(&desc->iuspin, flags);
607 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
608 spin_unlock_irqrestore(&desc->iuspin, flags);
609 } else {
610 spin_unlock_irqrestore(&desc->iuspin, flags);
611 rv = usb_submit_urb(desc->response, GFP_KERNEL);
612 if (rv < 0 && rv != -EPERM) {
613 spin_lock_irqsave(&desc->iuspin, flags);
614 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
615 schedule_work(&desc->rxwork);
616 spin_unlock_irqrestore(&desc->iuspin, flags);
617 }
618 }
619}
620
621/* --- hotplug --- */
622
623static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
624{
625 int rv = -EINVAL;
626 struct usb_device *udev = interface_to_usbdev(intf);
627 struct wdm_device *desc;
628 struct usb_host_interface *iface;
629 struct usb_endpoint_descriptor *ep;
630 struct usb_cdc_dmm_desc *dmhd;
631 u8 *buffer = intf->altsetting->extra;
632 int buflen = intf->altsetting->extralen;
633 u16 maxcom = 0;
634
635 if (!buffer)
636 goto out;
637
052fbc0d 638 while (buflen > 2) {
afba937e 639 if (buffer [1] != USB_DT_CS_INTERFACE) {
9908a32e 640 dev_err(&intf->dev, "skipping garbage\n");
afba937e
ON		 641 goto next_desc;
642 }
643
644 switch (buffer [2]) {
645 case USB_CDC_HEADER_TYPE:
646 break;
647 case USB_CDC_DMM_TYPE:
648 dmhd = (struct usb_cdc_dmm_desc *)buffer;
649 maxcom = le16_to_cpu(dmhd->wMaxCommand);
650 dev_dbg(&intf->dev,
651 "Finding maximum buffer length: %d", maxcom);
652 break;
653 default:
9908a32e
GKH		 654 dev_err(&intf->dev,
655 "Ignoring extra header, type %d, length %d\n",
afba937e
ON		 656 buffer[2], buffer[0]);
657 break;
658 }
659next_desc:
660 buflen -= buffer[0];
661 buffer += buffer[0];
662 }
663
664 rv = -ENOMEM;
665 desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL);
666 if (!desc)
667 goto out;
860e41a7 668 mutex_init(&desc->lock);
afba937e
ON		 669 spin_lock_init(&desc->iuspin);
670 init_waitqueue_head(&desc->wait);
671 desc->wMaxCommand = maxcom;
052fbc0d 672 /* this will be expanded and needed in hardware endianness */
afba937e
ON		 673 desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber);
674 desc->intf = intf;
675 INIT_WORK(&desc->rxwork, wdm_rxwork);
676
052fbc0d
ON		 677 rv = -EINVAL;
678 iface = intf->cur_altsetting;
679 if (iface->desc.bNumEndpoints != 1)
680 goto err;
afba937e 681 ep = &iface->endpoint[0].desc;
052fbc0d 682 if (!ep || !usb_endpoint_is_int_in(ep))
afba937e 683 goto err;
afba937e 684
fa4144b7
AV		 685 desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize);
686 desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0;
afba937e
ON		 687
688 desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
689 if (!desc->orq)
690 goto err;
691 desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
692 if (!desc->irq)
693 goto err;
694
695 desc->validity = usb_alloc_urb(0, GFP_KERNEL);
696 if (!desc->validity)
697 goto err;
698
699 desc->response = usb_alloc_urb(0, GFP_KERNEL);
700 if (!desc->response)
701 goto err;
702
703 desc->command = usb_alloc_urb(0, GFP_KERNEL);
704 if (!desc->command)
705 goto err;
706
707 desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
708 if (!desc->ubuf)
709 goto err;
710
997ea58e 711 desc->sbuf = usb_alloc_coherent(interface_to_usbdev(intf),
afba937e
ON		 712 desc->wMaxPacketSize,
713 GFP_KERNEL,
714 &desc->validity->transfer_dma);
715 if (!desc->sbuf)
716 goto err;
717
997ea58e
DM		 718 desc->inbuf = usb_alloc_coherent(interface_to_usbdev(intf),
719 desc->bMaxPacketSize0,
720 GFP_KERNEL,
721 &desc->response->transfer_dma);
afba937e
ON		 722 if (!desc->inbuf)
723 goto err2;
724
725 usb_fill_int_urb(
726 desc->validity,
727 interface_to_usbdev(intf),
728 usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress),
729 desc->sbuf,
730 desc->wMaxPacketSize,
731 wdm_int_callback,
732 desc,
733 ep->bInterval
734 );
735 desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
736
737 usb_set_intfdata(intf, desc);
738 rv = usb_register_dev(intf, &wdm_class);
afba937e 739 if (rv < 0)
052fbc0d
ON		 740 goto err3;
741 else
742 dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n",
743 intf->minor - WDM_MINOR_BASE);
afba937e
ON		 744out:
745 return rv;
052fbc0d
ON		 746err3:
747 usb_set_intfdata(intf, NULL);
997ea58e
DM		 748 usb_free_coherent(interface_to_usbdev(desc->intf),
749 desc->bMaxPacketSize0,
052fbc0d
ON		 750 desc->inbuf,
751 desc->response->transfer_dma);
afba937e 752err2:
997ea58e
DM		 753 usb_free_coherent(interface_to_usbdev(desc->intf),
754 desc->wMaxPacketSize,
755 desc->sbuf,
756 desc->validity->transfer_dma);
afba937e
ON		 757err:
758 free_urbs(desc);
759 kfree(desc->ubuf);
760 kfree(desc->orq);
761 kfree(desc->irq);
762 kfree(desc);
763 return rv;
764}
765
766static void wdm_disconnect(struct usb_interface *intf)
767{
768 struct wdm_device *desc;
769 unsigned long flags;
770
771 usb_deregister_dev(intf, &wdm_class);
772 mutex_lock(&wdm_mutex);
773 desc = usb_get_intfdata(intf);
774
775 /* the spinlock makes sure no new urbs are generated in the callbacks */
776 spin_lock_irqsave(&desc->iuspin, flags);
777 set_bit(WDM_DISCONNECTING, &desc->flags);
778 set_bit(WDM_READ, &desc->flags);
17d80d56 779 /* to terminate pending flushes */
afba937e
ON		 780 clear_bit(WDM_IN_USE, &desc->flags);
781 spin_unlock_irqrestore(&desc->iuspin, flags);
860e41a7 782 mutex_lock(&desc->lock);
afba937e 783 kill_urbs(desc);
d93d16e9 784 cancel_work_sync(&desc->rxwork);
860e41a7 785 mutex_unlock(&desc->lock);
afba937e
ON		 786 wake_up_all(&desc->wait);
787 if (!desc->count)
788 cleanup(desc);
789 mutex_unlock(&wdm_mutex);
790}
791
d93d16e9 792#ifdef CONFIG_PM
17d80d56
ON		 793static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
794{
795 struct wdm_device *desc = usb_get_intfdata(intf);
796 int rv = 0;
797
798 dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
799
d93d16e9
ON		 800 /* if this is an autosuspend the caller does the locking */
801 if (!(message.event & PM_EVENT_AUTO))
802 mutex_lock(&desc->lock);
62e66854 803 spin_lock_irq(&desc->iuspin);
d93d16e9 804
65bfd296 805 if ((message.event & PM_EVENT_AUTO) &&
922a5ead
ON		 806 (test_bit(WDM_IN_USE, &desc->flags)
807 || test_bit(WDM_RESPONDING, &desc->flags))) {
62e66854 808 spin_unlock_irq(&desc->iuspin);
17d80d56
ON		 809 rv = -EBUSY;
810 } else {
d93d16e9 811
beb1d35f 812 set_bit(WDM_SUSPENDING, &desc->flags);
62e66854 813 spin_unlock_irq(&desc->iuspin);
d93d16e9 814 /* callback submits work - order is essential */
17d80d56 815 kill_urbs(desc);
d93d16e9 816 cancel_work_sync(&desc->rxwork);
17d80d56 817 }
d93d16e9
ON		 818 if (!(message.event & PM_EVENT_AUTO))
819 mutex_unlock(&desc->lock);
17d80d56
ON		 820
821 return rv;
822}
d93d16e9 823#endif
17d80d56
ON		 824
825static int recover_from_urb_loss(struct wdm_device *desc)
826{
827 int rv = 0;
828
829 if (desc->count) {
830 rv = usb_submit_urb(desc->validity, GFP_NOIO);
831 if (rv < 0)
9908a32e
GKH		 832 dev_err(&desc->intf->dev,
833 "Error resume submitting int urb - %d\n", rv);
17d80d56
ON		 834 }
835 return rv;
836}
d93d16e9
ON		 837
838#ifdef CONFIG_PM
17d80d56
ON		 839static int wdm_resume(struct usb_interface *intf)
840{
841 struct wdm_device *desc = usb_get_intfdata(intf);
842 int rv;
843
844 dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
338124c1 845
beb1d35f 846 clear_bit(WDM_SUSPENDING, &desc->flags);
62e66854 847 rv = recover_from_urb_loss(desc);
338124c1 848
17d80d56
ON		 849 return rv;
850}
d93d16e9 851#endif
17d80d56
ON		 852
853static int wdm_pre_reset(struct usb_interface *intf)
854{
855 struct wdm_device *desc = usb_get_intfdata(intf);
856
860e41a7 857 mutex_lock(&desc->lock);
d771d8aa
ON		 858 kill_urbs(desc);
859
860 /*
861 * we notify everybody using poll of
862 * an exceptional situation
863 * must be done before recovery lest a spontaneous
864 * message from the device is lost
865 */
866 spin_lock_irq(&desc->iuspin);
867 desc->rerr = -EINTR;
868 spin_unlock_irq(&desc->iuspin);
869 wake_up_all(&desc->wait);
17d80d56
ON		 870 return 0;
871}
872
873static int wdm_post_reset(struct usb_interface *intf)
874{
875 struct wdm_device *desc = usb_get_intfdata(intf);
876 int rv;
877
878 rv = recover_from_urb_loss(desc);
860e41a7 879 mutex_unlock(&desc->lock);
17d80d56
ON		 880 return 0;
881}
882
afba937e
ON		 883static struct usb_driver wdm_driver = {
884 .name = "cdc_wdm",
885 .probe = wdm_probe,
886 .disconnect = wdm_disconnect,
d93d16e9 887#ifdef CONFIG_PM
17d80d56
ON		 888 .suspend = wdm_suspend,
889 .resume = wdm_resume,
890 .reset_resume = wdm_resume,
d93d16e9 891#endif
17d80d56
ON		 892 .pre_reset = wdm_pre_reset,
893 .post_reset = wdm_post_reset,
afba937e 894 .id_table = wdm_ids,
17d80d56 895 .supports_autosuspend = 1,
afba937e
ON		 896};
897
898/* --- low level module stuff --- */
899
900static int __init wdm_init(void)
901{
902 int rv;
903
904 rv = usb_register(&wdm_driver);
905
906 return rv;
907}
908
909static void __exit wdm_exit(void)
910{
911 usb_deregister(&wdm_driver);
912}
913
914module_init(wdm_init);
915module_exit(wdm_exit);
916
917MODULE_AUTHOR(DRIVER_AUTHOR);
87d65e54 918MODULE_DESCRIPTION(DRIVER_DESC);
afba937e 919MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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