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Merge tag 'tty-3.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
[GitHub/mt8127/android_kernel_alcatel_ttab.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
15699e6f
BM		 60/* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */
61#define WDM_DEFAULT_BUFSIZE 256
afba937e
ON		 62
63static DEFINE_MUTEX(wdm_mutex);
64
65/* --- method tables --- */
66
67struct wdm_device {
68 u8 *inbuf; /* buffer for response */
69 u8 *outbuf; /* buffer for command */
70 u8 *sbuf; /* buffer for status */
71 u8 *ubuf; /* buffer for copy to user space */
72
73 struct urb *command;
74 struct urb *response;
75 struct urb *validity;
76 struct usb_interface *intf;
77 struct usb_ctrlrequest *orq;
78 struct usb_ctrlrequest *irq;
79 spinlock_t iuspin;
80
81 unsigned long flags;
82 u16 bufsize;
83 u16 wMaxCommand;
84 u16 wMaxPacketSize;
85 u16 bMaxPacketSize0;
86 __le16 inum;
87 int reslength;
88 int length;
89 int read;
90 int count;
91 dma_addr_t shandle;
92 dma_addr_t ihandle;
e8537bd2
BM		 93 struct mutex wlock;
94 struct mutex rlock;
afba937e
ON		 95 wait_queue_head_t wait;
96 struct work_struct rxwork;
97 int werr;
98 int rerr;
99};
100
101static struct usb_driver wdm_driver;
102
103/* --- callbacks --- */
104static void wdm_out_callback(struct urb *urb)
105{
106 struct wdm_device *desc;
107 desc = urb->context;
108 spin_lock(&desc->iuspin);
109 desc->werr = urb->status;
110 spin_unlock(&desc->iuspin);
111 clear_bit(WDM_IN_USE, &desc->flags);
112 kfree(desc->outbuf);
113 wake_up(&desc->wait);
114}
115
116static void wdm_in_callback(struct urb *urb)
117{
118 struct wdm_device *desc = urb->context;
119 int status = urb->status;
120
121 spin_lock(&desc->iuspin);
922a5ead 122 clear_bit(WDM_RESPONDING, &desc->flags);
afba937e
ON		 123
124 if (status) {
125 switch (status) {
126 case -ENOENT:
127 dev_dbg(&desc->intf->dev,
128 "nonzero urb status received: -ENOENT");
922a5ead 129 goto skip_error;
afba937e
ON		 130 case -ECONNRESET:
131 dev_dbg(&desc->intf->dev,
132 "nonzero urb status received: -ECONNRESET");
922a5ead 133 goto skip_error;
afba937e
ON		 134 case -ESHUTDOWN:
135 dev_dbg(&desc->intf->dev,
136 "nonzero urb status received: -ESHUTDOWN");
922a5ead 137 goto skip_error;
afba937e 138 case -EPIPE:
9908a32e
GKH		 139 dev_err(&desc->intf->dev,
140 "nonzero urb status received: -EPIPE\n");
afba937e
ON		 141 break;
142 default:
9908a32e
GKH		 143 dev_err(&desc->intf->dev,
144 "Unexpected error %d\n", status);
afba937e
ON		 145 break;
146 }
147 }
148
149 desc->rerr = status;
150 desc->reslength = urb->actual_length;
151 memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength);
152 desc->length += desc->reslength;
922a5ead 153skip_error:
afba937e
ON		 154 wake_up(&desc->wait);
155
156 set_bit(WDM_READ, &desc->flags);
157 spin_unlock(&desc->iuspin);
158}
159
160static void wdm_int_callback(struct urb *urb)
161{
162 int rv = 0;
163 int status = urb->status;
164 struct wdm_device *desc;
165 struct usb_ctrlrequest *req;
166 struct usb_cdc_notification *dr;
167
168 desc = urb->context;
169 req = desc->irq;
170 dr = (struct usb_cdc_notification *)desc->sbuf;
171
172 if (status) {
173 switch (status) {
174 case -ESHUTDOWN:
175 case -ENOENT:
176 case -ECONNRESET:
177 return; /* unplug */
178 case -EPIPE:
179 set_bit(WDM_INT_STALL, &desc->flags);
9908a32e 180 dev_err(&desc->intf->dev, "Stall on int endpoint\n");
afba937e
ON		 181 goto sw; /* halt is cleared in work */
182 default:
9908a32e
GKH		 183 dev_err(&desc->intf->dev,
184 "nonzero urb status received: %d\n", status);
afba937e
ON		 185 break;
186 }
187 }
188
189 if (urb->actual_length < sizeof(struct usb_cdc_notification)) {
9908a32e
GKH		 190 dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n",
191 urb->actual_length);
afba937e
ON		 192 goto exit;
193 }
194
195 switch (dr->bNotificationType) {
196 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
197 dev_dbg(&desc->intf->dev,
198 "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d",
199 dr->wIndex, dr->wLength);
200 break;
201
202 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
203
204 dev_dbg(&desc->intf->dev,
205 "NOTIFY_NETWORK_CONNECTION %s network",
206 dr->wValue ? "connected to" : "disconnected from");
207 goto exit;
208 default:
209 clear_bit(WDM_POLL_RUNNING, &desc->flags);
9908a32e
GKH		 210 dev_err(&desc->intf->dev,
211 "unknown notification %d received: index %d len %d\n",
afba937e
ON		 212 dr->bNotificationType, dr->wIndex, dr->wLength);
213 goto exit;
214 }
215
216 req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
217 req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
218 req->wValue = 0;
219 req->wIndex = desc->inum;
87d65e54 220 req->wLength = cpu_to_le16(desc->wMaxCommand);
afba937e
ON		 221
222 usb_fill_control_urb(
223 desc->response,
224 interface_to_usbdev(desc->intf),
225 /* using common endpoint 0 */
226 usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
227 (unsigned char *)req,
228 desc->inbuf,
87d65e54 229 desc->wMaxCommand,
afba937e
ON		 230 wdm_in_callback,
231 desc
232 );
233 desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
234 spin_lock(&desc->iuspin);
235 clear_bit(WDM_READ, &desc->flags);
922a5ead 236 set_bit(WDM_RESPONDING, &desc->flags);
beb1d35f
ON		 237 if (!test_bit(WDM_DISCONNECTING, &desc->flags)
238 && !test_bit(WDM_SUSPENDING, &desc->flags)) {
afba937e
ON		 239 rv = usb_submit_urb(desc->response, GFP_ATOMIC);
240 dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d",
241 __func__, rv);
242 }
243 spin_unlock(&desc->iuspin);
244 if (rv < 0) {
922a5ead 245 clear_bit(WDM_RESPONDING, &desc->flags);
afba937e
ON		 246 if (rv == -EPERM)
247 return;
248 if (rv == -ENOMEM) {
249sw:
250 rv = schedule_work(&desc->rxwork);
251 if (rv)
9908a32e
GKH		 252 dev_err(&desc->intf->dev,
253 "Cannot schedule work\n");
afba937e
ON		 254 }
255 }
256exit:
257 rv = usb_submit_urb(urb, GFP_ATOMIC);
258 if (rv)
9908a32e
GKH		 259 dev_err(&desc->intf->dev,
260 "%s - usb_submit_urb failed with result %d\n",
261 __func__, rv);
afba937e
ON		 262
263}
264
265static void kill_urbs(struct wdm_device *desc)
266{
17d80d56 267 /* the order here is essential */
afba937e
ON		 268 usb_kill_urb(desc->command);
269 usb_kill_urb(desc->validity);
270 usb_kill_urb(desc->response);
271}
272
273static void free_urbs(struct wdm_device *desc)
274{
275 usb_free_urb(desc->validity);
276 usb_free_urb(desc->response);
277 usb_free_urb(desc->command);
278}
279
280static void cleanup(struct wdm_device *desc)
281{
997ea58e
DM		 282 usb_free_coherent(interface_to_usbdev(desc->intf),
283 desc->wMaxPacketSize,
284 desc->sbuf,
285 desc->validity->transfer_dma);
286 usb_free_coherent(interface_to_usbdev(desc->intf),
878b753e 287 desc->bMaxPacketSize0,
997ea58e
DM		 288 desc->inbuf,
289 desc->response->transfer_dma);
afba937e
ON		 290 kfree(desc->orq);
291 kfree(desc->irq);
292 kfree(desc->ubuf);
293 free_urbs(desc);
294 kfree(desc);
295}
296
297static ssize_t wdm_write
298(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
299{
300 u8 *buf;
301 int rv = -EMSGSIZE, r, we;
302 struct wdm_device *desc = file->private_data;
303 struct usb_ctrlrequest *req;
304
305 if (count > desc->wMaxCommand)
306 count = desc->wMaxCommand;
307
308 spin_lock_irq(&desc->iuspin);
309 we = desc->werr;
310 desc->werr = 0;
311 spin_unlock_irq(&desc->iuspin);
312 if (we < 0)
313 return -EIO;
314
860e41a7
ON		 315 desc->outbuf = buf = kmalloc(count, GFP_KERNEL);
316 if (!buf) {
317 rv = -ENOMEM;
318 goto outnl;
319 }
320
321 r = copy_from_user(buf, buffer, count);
322 if (r > 0) {
323 kfree(buf);
324 rv = -EFAULT;
325 goto outnl;
326 }
327
328 /* concurrent writes and disconnect */
e8537bd2 329 r = mutex_lock_interruptible(&desc->wlock);
afba937e 330 rv = -ERESTARTSYS;
860e41a7
ON		 331 if (r) {
332 kfree(buf);
afba937e 333 goto outnl;
860e41a7
ON		 334 }
335
336 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
337 kfree(buf);
338 rv = -ENODEV;
339 goto outnp;
340 }
afba937e 341
17d80d56 342 r = usb_autopm_get_interface(desc->intf);
860e41a7
ON		 343 if (r < 0) {
344 kfree(buf);
17d80d56 345 goto outnp;
860e41a7 346 }
7f1dc313 347
0cdfb819 348 if (!(file->f_flags & O_NONBLOCK))
7f1dc313
ON		 349 r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE,
350 &desc->flags));
351 else
352 if (test_bit(WDM_IN_USE, &desc->flags))
353 r = -EAGAIN;
860e41a7 354 if (r < 0) {
afba937e 355 kfree(buf);
afba937e
ON		 356 goto out;
357 }
358
359 req = desc->orq;
360 usb_fill_control_urb(
361 desc->command,
362 interface_to_usbdev(desc->intf),
363 /* using common endpoint 0 */
364 usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0),
365 (unsigned char *)req,
366 buf,
367 count,
368 wdm_out_callback,
369 desc
370 );
371
372 req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS |
373 USB_RECIP_INTERFACE);
374 req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
375 req->wValue = 0;
376 req->wIndex = desc->inum;
377 req->wLength = cpu_to_le16(count);
378 set_bit(WDM_IN_USE, &desc->flags);
379
380 rv = usb_submit_urb(desc->command, GFP_KERNEL);
381 if (rv < 0) {
382 kfree(buf);
383 clear_bit(WDM_IN_USE, &desc->flags);
9908a32e 384 dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv);
afba937e
ON		 385 } else {
386 dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d",
387 req->wIndex);
388 }
389out:
17d80d56
ON		 390 usb_autopm_put_interface(desc->intf);
391outnp:
e8537bd2 392 mutex_unlock(&desc->wlock);
afba937e
ON		 393outnl:
394 return rv < 0 ? rv : count;
395}
396
397static ssize_t wdm_read
398(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
399{
7f1dc313 400 int rv, cntr = 0;
afba937e
ON		 401 int i = 0;
402 struct wdm_device *desc = file->private_data;
403
404
e8537bd2 405 rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */
afba937e
ON		 406 if (rv < 0)
407 return -ERESTARTSYS;
408
409 if (desc->length == 0) {
410 desc->read = 0;
411retry:
7f1dc313
ON		 412 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
413 rv = -ENODEV;
414 goto err;
415 }
afba937e 416 i++;
7f1dc313
ON		 417 if (file->f_flags & O_NONBLOCK) {
418 if (!test_bit(WDM_READ, &desc->flags)) {
419 rv = cntr ? cntr : -EAGAIN;
420 goto err;
421 }
422 rv = 0;
423 } else {
424 rv = wait_event_interruptible(desc->wait,
425 test_bit(WDM_READ, &desc->flags));
426 }
afba937e 427
7f1dc313 428 /* may have happened while we slept */
17d80d56
ON		 429 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
430 rv = -ENODEV;
431 goto err;
432 }
433 usb_mark_last_busy(interface_to_usbdev(desc->intf));
afba937e
ON		 434 if (rv < 0) {
435 rv = -ERESTARTSYS;
436 goto err;
437 }
438
439 spin_lock_irq(&desc->iuspin);
440
441 if (desc->rerr) { /* read completed, error happened */
afba937e
ON		 442 desc->rerr = 0;
443 spin_unlock_irq(&desc->iuspin);
afba937e
ON		 444 rv = -EIO;
445 goto err;
446 }
447 /*
448 * recheck whether we've lost the race
449 * against the completion handler
450 */
451 if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */
452 spin_unlock_irq(&desc->iuspin);
453 goto retry;
454 }
455 if (!desc->reslength) { /* zero length read */
456 spin_unlock_irq(&desc->iuspin);
457 goto retry;
458 }
459 clear_bit(WDM_READ, &desc->flags);
460 spin_unlock_irq(&desc->iuspin);
461 }
462
463 cntr = count > desc->length ? desc->length : count;
464 rv = copy_to_user(buffer, desc->ubuf, cntr);
465 if (rv > 0) {
466 rv = -EFAULT;
467 goto err;
468 }
469
470 for (i = 0; i < desc->length - cntr; i++)
471 desc->ubuf[i] = desc->ubuf[i + cntr];
472
c428b70c 473 spin_lock_irq(&desc->iuspin);
afba937e 474 desc->length -= cntr;
c428b70c 475 spin_unlock_irq(&desc->iuspin);
87d65e54
ON		 476 /* in case we had outstanding data */
477 if (!desc->length)
478 clear_bit(WDM_READ, &desc->flags);
afba937e
ON		 479 rv = cntr;
480
481err:
e8537bd2 482 mutex_unlock(&desc->rlock);
afba937e
ON		 483 return rv;
484}
485
486static int wdm_flush(struct file *file, fl_owner_t id)
487{
488 struct wdm_device *desc = file->private_data;
489
490 wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags));
491 if (desc->werr < 0)
9908a32e
GKH		 492 dev_err(&desc->intf->dev, "Error in flush path: %d\n",
493 desc->werr);
afba937e
ON		 494
495 return desc->werr;
496}
497
498static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait)
499{
500 struct wdm_device *desc = file->private_data;
501 unsigned long flags;
502 unsigned int mask = 0;
503
504 spin_lock_irqsave(&desc->iuspin, flags);
505 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
506 mask = POLLERR;
507 spin_unlock_irqrestore(&desc->iuspin, flags);
508 goto desc_out;
509 }
510 if (test_bit(WDM_READ, &desc->flags))
511 mask = POLLIN | POLLRDNORM;
512 if (desc->rerr || desc->werr)
513 mask |= POLLERR;
514 if (!test_bit(WDM_IN_USE, &desc->flags))
515 mask |= POLLOUT | POLLWRNORM;
516 spin_unlock_irqrestore(&desc->iuspin, flags);
517
518 poll_wait(file, &desc->wait, wait);
519
520desc_out:
521 return mask;
522}
523
524static int wdm_open(struct inode *inode, struct file *file)
525{
526 int minor = iminor(inode);
527 int rv = -ENODEV;
528 struct usb_interface *intf;
529 struct wdm_device *desc;
530
531 mutex_lock(&wdm_mutex);
532 intf = usb_find_interface(&wdm_driver, minor);
533 if (!intf)
534 goto out;
535
536 desc = usb_get_intfdata(intf);
537 if (test_bit(WDM_DISCONNECTING, &desc->flags))
538 goto out;
afba937e
ON		 539 file->private_data = desc;
540
17d80d56 541 rv = usb_autopm_get_interface(desc->intf);
afba937e 542 if (rv < 0) {
9908a32e 543 dev_err(&desc->intf->dev, "Error autopm - %d\n", rv);
afba937e
ON		 544 goto out;
545 }
17d80d56 546 intf->needs_remote_wakeup = 1;
afba937e 547
e8537bd2
BM		 548 /* using write lock to protect desc->count */
549 mutex_lock(&desc->wlock);
17d80d56 550 if (!desc->count++) {
d771d8aa
ON		 551 desc->werr = 0;
552 desc->rerr = 0;
17d80d56
ON		 553 rv = usb_submit_urb(desc->validity, GFP_KERNEL);
554 if (rv < 0) {
555 desc->count--;
9908a32e
GKH		 556 dev_err(&desc->intf->dev,
557 "Error submitting int urb - %d\n", rv);
17d80d56
ON		 558 }
559 } else {
560 rv = 0;
561 }
e8537bd2 562 mutex_unlock(&desc->wlock);
17d80d56 563 usb_autopm_put_interface(desc->intf);
afba937e
ON		 564out:
565 mutex_unlock(&wdm_mutex);
566 return rv;
567}
568
569static int wdm_release(struct inode *inode, struct file *file)
570{
571 struct wdm_device *desc = file->private_data;
572
573 mutex_lock(&wdm_mutex);
e8537bd2
BM		 574
575 /* using write lock to protect desc->count */
576 mutex_lock(&desc->wlock);
afba937e 577 desc->count--;
e8537bd2 578 mutex_unlock(&desc->wlock);
17d80d56 579
afba937e
ON		 580 if (!desc->count) {
581 dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
582 kill_urbs(desc);
17d80d56
ON		 583 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
584 desc->intf->needs_remote_wakeup = 0;
afba937e
ON		 585 }
586 mutex_unlock(&wdm_mutex);
587 return 0;
588}
589
590static const struct file_operations wdm_fops = {
591 .owner = THIS_MODULE,
592 .read = wdm_read,
593 .write = wdm_write,
594 .open = wdm_open,
595 .flush = wdm_flush,
596 .release = wdm_release,
6038f373
AB		 597 .poll = wdm_poll,
598 .llseek = noop_llseek,
afba937e
ON		 599};
600
601static struct usb_class_driver wdm_class = {
602 .name = "cdc-wdm%d",
603 .fops = &wdm_fops,
604 .minor_base = WDM_MINOR_BASE,
605};
606
607/* --- error handling --- */
608static void wdm_rxwork(struct work_struct *work)
609{
610 struct wdm_device *desc = container_of(work, struct wdm_device, rxwork);
611 unsigned long flags;
612 int rv;
613
614 spin_lock_irqsave(&desc->iuspin, flags);
615 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
616 spin_unlock_irqrestore(&desc->iuspin, flags);
617 } else {
618 spin_unlock_irqrestore(&desc->iuspin, flags);
619 rv = usb_submit_urb(desc->response, GFP_KERNEL);
620 if (rv < 0 && rv != -EPERM) {
621 spin_lock_irqsave(&desc->iuspin, flags);
622 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
623 schedule_work(&desc->rxwork);
624 spin_unlock_irqrestore(&desc->iuspin, flags);
625 }
626 }
627}
628
629/* --- hotplug --- */
630
631static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
632{
633 int rv = -EINVAL;
634 struct usb_device *udev = interface_to_usbdev(intf);
635 struct wdm_device *desc;
636 struct usb_host_interface *iface;
637 struct usb_endpoint_descriptor *ep;
638 struct usb_cdc_dmm_desc *dmhd;
639 u8 *buffer = intf->altsetting->extra;
640 int buflen = intf->altsetting->extralen;
15699e6f 641 u16 maxcom = WDM_DEFAULT_BUFSIZE;
afba937e
ON		 642
643 if (!buffer)
644 goto out;
645
052fbc0d 646 while (buflen > 2) {
afba937e 647 if (buffer [1] != USB_DT_CS_INTERFACE) {
9908a32e 648 dev_err(&intf->dev, "skipping garbage\n");
afba937e
ON		 649 goto next_desc;
650 }
651
652 switch (buffer [2]) {
653 case USB_CDC_HEADER_TYPE:
654 break;
655 case USB_CDC_DMM_TYPE:
656 dmhd = (struct usb_cdc_dmm_desc *)buffer;
657 maxcom = le16_to_cpu(dmhd->wMaxCommand);
658 dev_dbg(&intf->dev,
659 "Finding maximum buffer length: %d", maxcom);
660 break;
661 default:
9908a32e
GKH		 662 dev_err(&intf->dev,
663 "Ignoring extra header, type %d, length %d\n",
afba937e
ON		 664 buffer[2], buffer[0]);
665 break;
666 }
667next_desc:
668 buflen -= buffer[0];
669 buffer += buffer[0];
670 }
671
672 rv = -ENOMEM;
673 desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL);
674 if (!desc)
675 goto out;
e8537bd2
BM		 676 mutex_init(&desc->rlock);
677 mutex_init(&desc->wlock);
afba937e
ON		 678 spin_lock_init(&desc->iuspin);
679 init_waitqueue_head(&desc->wait);
680 desc->wMaxCommand = maxcom;
052fbc0d 681 /* this will be expanded and needed in hardware endianness */
afba937e
ON		 682 desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber);
683 desc->intf = intf;
684 INIT_WORK(&desc->rxwork, wdm_rxwork);
685
052fbc0d
ON		 686 rv = -EINVAL;
687 iface = intf->cur_altsetting;
688 if (iface->desc.bNumEndpoints != 1)
689 goto err;
afba937e 690 ep = &iface->endpoint[0].desc;
052fbc0d 691 if (!ep || !usb_endpoint_is_int_in(ep))
afba937e 692 goto err;
afba937e 693
29cc8897 694 desc->wMaxPacketSize = usb_endpoint_maxp(ep);
fa4144b7 695 desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0;
afba937e
ON		 696
697 desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
698 if (!desc->orq)
699 goto err;
700 desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
701 if (!desc->irq)
702 goto err;
703
704 desc->validity = usb_alloc_urb(0, GFP_KERNEL);
705 if (!desc->validity)
706 goto err;
707
708 desc->response = usb_alloc_urb(0, GFP_KERNEL);
709 if (!desc->response)
710 goto err;
711
712 desc->command = usb_alloc_urb(0, GFP_KERNEL);
713 if (!desc->command)
714 goto err;
715
716 desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
717 if (!desc->ubuf)
718 goto err;
719
997ea58e 720 desc->sbuf = usb_alloc_coherent(interface_to_usbdev(intf),
afba937e
ON		 721 desc->wMaxPacketSize,
722 GFP_KERNEL,
723 &desc->validity->transfer_dma);
724 if (!desc->sbuf)
725 goto err;
726
997ea58e 727 desc->inbuf = usb_alloc_coherent(interface_to_usbdev(intf),
655e247d 728 desc->wMaxCommand,
997ea58e
DM		 729 GFP_KERNEL,
730 &desc->response->transfer_dma);
afba937e
ON		 731 if (!desc->inbuf)
732 goto err2;
733
734 usb_fill_int_urb(
735 desc->validity,
736 interface_to_usbdev(intf),
737 usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress),
738 desc->sbuf,
739 desc->wMaxPacketSize,
740 wdm_int_callback,
741 desc,
742 ep->bInterval
743 );
744 desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
745
746 usb_set_intfdata(intf, desc);
747 rv = usb_register_dev(intf, &wdm_class);
afba937e 748 if (rv < 0)
052fbc0d
ON		 749 goto err3;
750 else
751 dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n",
752 intf->minor - WDM_MINOR_BASE);
afba937e
ON		 753out:
754 return rv;
052fbc0d
ON		 755err3:
756 usb_set_intfdata(intf, NULL);
997ea58e
DM		 757 usb_free_coherent(interface_to_usbdev(desc->intf),
758 desc->bMaxPacketSize0,
052fbc0d
ON		 759 desc->inbuf,
760 desc->response->transfer_dma);
afba937e 761err2:
997ea58e
DM		 762 usb_free_coherent(interface_to_usbdev(desc->intf),
763 desc->wMaxPacketSize,
764 desc->sbuf,
765 desc->validity->transfer_dma);
afba937e
ON		 766err:
767 free_urbs(desc);
768 kfree(desc->ubuf);
769 kfree(desc->orq);
770 kfree(desc->irq);
771 kfree(desc);
772 return rv;
773}
774
775static void wdm_disconnect(struct usb_interface *intf)
776{
777 struct wdm_device *desc;
778 unsigned long flags;
779
780 usb_deregister_dev(intf, &wdm_class);
781 mutex_lock(&wdm_mutex);
782 desc = usb_get_intfdata(intf);
783
784 /* the spinlock makes sure no new urbs are generated in the callbacks */
785 spin_lock_irqsave(&desc->iuspin, flags);
786 set_bit(WDM_DISCONNECTING, &desc->flags);
787 set_bit(WDM_READ, &desc->flags);
17d80d56 788 /* to terminate pending flushes */
afba937e
ON		 789 clear_bit(WDM_IN_USE, &desc->flags);
790 spin_unlock_irqrestore(&desc->iuspin, flags);
62aaf24d 791 wake_up_all(&desc->wait);
e8537bd2
BM		 792 mutex_lock(&desc->rlock);
793 mutex_lock(&desc->wlock);
afba937e 794 kill_urbs(desc);
d93d16e9 795 cancel_work_sync(&desc->rxwork);
e8537bd2
BM		 796 mutex_unlock(&desc->wlock);
797 mutex_unlock(&desc->rlock);
afba937e
ON		 798 if (!desc->count)
799 cleanup(desc);
800 mutex_unlock(&wdm_mutex);
801}
802
d93d16e9 803#ifdef CONFIG_PM
17d80d56
ON		 804static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
805{
806 struct wdm_device *desc = usb_get_intfdata(intf);
807 int rv = 0;
808
809 dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
810
d93d16e9 811 /* if this is an autosuspend the caller does the locking */
e8537bd2
BM		 812 if (!PMSG_IS_AUTO(message)) {
813 mutex_lock(&desc->rlock);
814 mutex_lock(&desc->wlock);
815 }
62e66854 816 spin_lock_irq(&desc->iuspin);
d93d16e9 817
5b1b0b81 818 if (PMSG_IS_AUTO(message) &&
922a5ead
ON		 819 (test_bit(WDM_IN_USE, &desc->flags)
820 || test_bit(WDM_RESPONDING, &desc->flags))) {
62e66854 821 spin_unlock_irq(&desc->iuspin);
17d80d56
ON		 822 rv = -EBUSY;
823 } else {
d93d16e9 824
beb1d35f 825 set_bit(WDM_SUSPENDING, &desc->flags);
62e66854 826 spin_unlock_irq(&desc->iuspin);
d93d16e9 827 /* callback submits work - order is essential */
17d80d56 828 kill_urbs(desc);
d93d16e9 829 cancel_work_sync(&desc->rxwork);
17d80d56 830 }
e8537bd2
BM		 831 if (!PMSG_IS_AUTO(message)) {
832 mutex_unlock(&desc->wlock);
833 mutex_unlock(&desc->rlock);
834 }
17d80d56
ON		 835
836 return rv;
837}
d93d16e9 838#endif
17d80d56
ON		 839
840static int recover_from_urb_loss(struct wdm_device *desc)
841{
842 int rv = 0;
843
844 if (desc->count) {
845 rv = usb_submit_urb(desc->validity, GFP_NOIO);
846 if (rv < 0)
9908a32e
GKH		 847 dev_err(&desc->intf->dev,
848 "Error resume submitting int urb - %d\n", rv);
17d80d56
ON		 849 }
850 return rv;
851}
d93d16e9
ON		 852
853#ifdef CONFIG_PM
17d80d56
ON		 854static int wdm_resume(struct usb_interface *intf)
855{
856 struct wdm_device *desc = usb_get_intfdata(intf);
857 int rv;
858
859 dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
338124c1 860
beb1d35f 861 clear_bit(WDM_SUSPENDING, &desc->flags);
62e66854 862 rv = recover_from_urb_loss(desc);
338124c1 863
17d80d56
ON		 864 return rv;
865}
d93d16e9 866#endif
17d80d56
ON		 867
868static int wdm_pre_reset(struct usb_interface *intf)
869{
870 struct wdm_device *desc = usb_get_intfdata(intf);
871
e8537bd2
BM		 872 mutex_lock(&desc->rlock);
873 mutex_lock(&desc->wlock);
d771d8aa
ON		 874 kill_urbs(desc);
875
876 /*
877 * we notify everybody using poll of
878 * an exceptional situation
879 * must be done before recovery lest a spontaneous
880 * message from the device is lost
881 */
882 spin_lock_irq(&desc->iuspin);
883 desc->rerr = -EINTR;
884 spin_unlock_irq(&desc->iuspin);
885 wake_up_all(&desc->wait);
17d80d56
ON		 886 return 0;
887}
888
889static int wdm_post_reset(struct usb_interface *intf)
890{
891 struct wdm_device *desc = usb_get_intfdata(intf);
892 int rv;
893
894 rv = recover_from_urb_loss(desc);
e8537bd2
BM		 895 mutex_unlock(&desc->wlock);
896 mutex_unlock(&desc->rlock);
17d80d56
ON		 897 return 0;
898}
899
afba937e
ON		 900static struct usb_driver wdm_driver = {
901 .name = "cdc_wdm",
902 .probe = wdm_probe,
903 .disconnect = wdm_disconnect,
d93d16e9 904#ifdef CONFIG_PM
17d80d56
ON		 905 .suspend = wdm_suspend,
906 .resume = wdm_resume,
907 .reset_resume = wdm_resume,
d93d16e9 908#endif
17d80d56
ON		 909 .pre_reset = wdm_pre_reset,
910 .post_reset = wdm_post_reset,
afba937e 911 .id_table = wdm_ids,
17d80d56 912 .supports_autosuspend = 1,
afba937e
ON		 913};
914
65db4305 915module_usb_driver(wdm_driver);
afba937e
ON		 916
917MODULE_AUTHOR(DRIVER_AUTHOR);
87d65e54 918MODULE_DESCRIPTION(DRIVER_DESC);
afba937e 919MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)