1/* 2 * cdc-wdm.c 3 * 4 * This driver supports USB CDC WCM Device Management. 5 * 6 * Copyright (c) 2007-2009 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/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 */ 30#define DRIVER_VERSION "v0.03" 31#define DRIVER_AUTHOR "Oliver Neukum" 32#define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management" 33 34static const 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 44MODULE_DEVICE_TABLE (usb, wdm_ids); 45 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#define WDM_RESPONDING 7 56#define WDM_SUSPENDING 8 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; 91 struct mutex lock; 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); 119 clear_bit(WDM_RESPONDING, &desc->flags); 120 121 if (status) { 122 switch (status) { 123 case -ENOENT: 124 dev_dbg(&desc->intf->dev, 125 "nonzero urb status received: -ENOENT"); 126 goto skip_error; 127 case -ECONNRESET: 128 dev_dbg(&desc->intf->dev, 129 "nonzero urb status received: -ECONNRESET"); 130 goto skip_error; 131 case -ESHUTDOWN: 132 dev_dbg(&desc->intf->dev, 133 "nonzero urb status received: -ESHUTDOWN"); 134 goto skip_error; 135 case -EPIPE: 136 dev_err(&desc->intf->dev, 137 "nonzero urb status received: -EPIPE\n"); 138 break; 139 default: 140 dev_err(&desc->intf->dev, 141 "Unexpected error %d\n", status); 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; 150skip_error: 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); 177 dev_err(&desc->intf->dev, "Stall on int endpoint\n"); 178 goto sw; /* halt is cleared in work */ 179 default: 180 dev_err(&desc->intf->dev, 181 "nonzero urb status received: %d\n", status); 182 break; 183 } 184 } 185 186 if (urb->actual_length < sizeof(struct usb_cdc_notification)) { 187 dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n", 188 urb->actual_length); 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); 207 dev_err(&desc->intf->dev, 208 "unknown notification %d received: index %d len %d\n", 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; 217 req->wLength = cpu_to_le16(desc->wMaxCommand); 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, 226 desc->wMaxCommand, 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 set_bit(WDM_RESPONDING, &desc->flags); 234 if (!test_bit(WDM_DISCONNECTING, &desc->flags) 235 && !test_bit(WDM_SUSPENDING, &desc->flags)) { 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) { 242 clear_bit(WDM_RESPONDING, &desc->flags); 243 if (rv == -EPERM) 244 return; 245 if (rv == -ENOMEM) { 246sw: 247 rv = schedule_work(&desc->rxwork); 248 if (rv) 249 dev_err(&desc->intf->dev, 250 "Cannot schedule work\n"); 251 } 252 } 253exit: 254 rv = usb_submit_urb(urb, GFP_ATOMIC); 255 if (rv) 256 dev_err(&desc->intf->dev, 257 "%s - usb_submit_urb failed with result %d\n", 258 __func__, rv); 259 260} 261 262static void kill_urbs(struct wdm_device *desc) 263{ 264 /* the order here is essential */ 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{ 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), 284 desc->wMaxCommand, 285 desc->inbuf, 286 desc->response->transfer_dma); 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; 311 312 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); 327 rv = -ERESTARTSYS; 328 if (r) { 329 kfree(buf); 330 goto outnl; 331 } 332 333 if (test_bit(WDM_DISCONNECTING, &desc->flags)) { 334 kfree(buf); 335 rv = -ENODEV; 336 goto outnp; 337 } 338 339 r = usb_autopm_get_interface(desc->intf); 340 if (r < 0) { 341 kfree(buf); 342 goto outnp; 343 } 344 345 if (!file->f_flags && O_NONBLOCK) 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; 351 if (r < 0) { 352 kfree(buf); 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); 381 dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); 382 } else { 383 dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", 384 req->wIndex); 385 } 386out: 387 usb_autopm_put_interface(desc->intf); 388outnp: 389 mutex_unlock(&desc->lock); 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{ 397 int rv, cntr = 0; 398 int i = 0; 399 struct wdm_device *desc = file->private_data; 400 401 402 rv = mutex_lock_interruptible(&desc->lock); /*concurrent reads */ 403 if (rv < 0) 404 return -ERESTARTSYS; 405 406 if (desc->length == 0) { 407 desc->read = 0; 408retry: 409 if (test_bit(WDM_DISCONNECTING, &desc->flags)) { 410 rv = -ENODEV; 411 goto err; 412 } 413 i++; 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 } 424 425 /* may have happened while we slept */ 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)); 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 */ 439 desc->rerr = 0; 440 spin_unlock_irq(&desc->iuspin); 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; 471 /* in case we had outstanding data */ 472 if (!desc->length) 473 clear_bit(WDM_READ, &desc->flags); 474 rv = cntr; 475 476err: 477 mutex_unlock(&desc->lock); 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) 487 dev_err(&desc->intf->dev, "Error in flush path: %d\n", 488 desc->werr); 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; 534 file->private_data = desc; 535 536 rv = usb_autopm_get_interface(desc->intf); 537 if (rv < 0) { 538 dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); 539 goto out; 540 } 541 intf->needs_remote_wakeup = 1; 542 543 mutex_lock(&desc->lock); 544 if (!desc->count++) { 545 rv = usb_submit_urb(desc->validity, GFP_KERNEL); 546 if (rv < 0) { 547 desc->count--; 548 dev_err(&desc->intf->dev, 549 "Error submitting int urb - %d\n", rv); 550 } 551 } else { 552 rv = 0; 553 } 554 mutex_unlock(&desc->lock); 555 usb_autopm_put_interface(desc->intf); 556out: 557 mutex_unlock(&wdm_mutex); 558 return rv; 559} 560 561static int wdm_release(struct inode *inode, struct file *file) 562{ 563 struct wdm_device *desc = file->private_data; 564 565 mutex_lock(&wdm_mutex); 566 mutex_lock(&desc->lock); 567 desc->count--; 568 mutex_unlock(&desc->lock); 569 570 if (!desc->count) { 571 dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); 572 kill_urbs(desc); 573 if (!test_bit(WDM_DISCONNECTING, &desc->flags)) 574 desc->intf->needs_remote_wakeup = 0; 575 } 576 mutex_unlock(&wdm_mutex); 577 return 0; 578} 579 580static const struct file_operations wdm_fops = { 581 .owner = THIS_MODULE, 582 .read = wdm_read, 583 .write = wdm_write, 584 .open = wdm_open, 585 .flush = wdm_flush, 586 .release = wdm_release, 587 .poll = wdm_poll 588}; 589 590static struct usb_class_driver wdm_class = { 591 .name = "cdc-wdm%d", 592 .fops = &wdm_fops, 593 .minor_base = WDM_MINOR_BASE, 594}; 595 596/* --- error handling --- */ 597static void wdm_rxwork(struct work_struct *work) 598{ 599 struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); 600 unsigned long flags; 601 int rv; 602 603 spin_lock_irqsave(&desc->iuspin, flags); 604 if (test_bit(WDM_DISCONNECTING, &desc->flags)) { 605 spin_unlock_irqrestore(&desc->iuspin, flags); 606 } else { 607 spin_unlock_irqrestore(&desc->iuspin, flags); 608 rv = usb_submit_urb(desc->response, GFP_KERNEL); 609 if (rv < 0 && rv != -EPERM) { 610 spin_lock_irqsave(&desc->iuspin, flags); 611 if (!test_bit(WDM_DISCONNECTING, &desc->flags)) 612 schedule_work(&desc->rxwork); 613 spin_unlock_irqrestore(&desc->iuspin, flags); 614 } 615 } 616} 617 618/* --- hotplug --- */ 619 620static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) 621{ 622 int rv = -EINVAL; 623 struct usb_device *udev = interface_to_usbdev(intf); 624 struct wdm_device *desc; 625 struct usb_host_interface *iface; 626 struct usb_endpoint_descriptor *ep; 627 struct usb_cdc_dmm_desc *dmhd; 628 u8 *buffer = intf->altsetting->extra; 629 int buflen = intf->altsetting->extralen; 630 u16 maxcom = 0; 631 632 if (!buffer) 633 goto out; 634 635 while (buflen > 2) { 636 if (buffer [1] != USB_DT_CS_INTERFACE) { 637 dev_err(&intf->dev, "skipping garbage\n"); 638 goto next_desc; 639 } 640 641 switch (buffer [2]) { 642 case USB_CDC_HEADER_TYPE: 643 break; 644 case USB_CDC_DMM_TYPE: 645 dmhd = (struct usb_cdc_dmm_desc *)buffer; 646 maxcom = le16_to_cpu(dmhd->wMaxCommand); 647 dev_dbg(&intf->dev, 648 "Finding maximum buffer length: %d", maxcom); 649 break; 650 default: 651 dev_err(&intf->dev, 652 "Ignoring extra header, type %d, length %d\n", 653 buffer[2], buffer[0]); 654 break; 655 } 656next_desc: 657 buflen -= buffer[0]; 658 buffer += buffer[0]; 659 } 660 661 rv = -ENOMEM; 662 desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); 663 if (!desc) 664 goto out; 665 mutex_init(&desc->lock); 666 spin_lock_init(&desc->iuspin); 667 init_waitqueue_head(&desc->wait); 668 desc->wMaxCommand = maxcom; 669 /* this will be expanded and needed in hardware endianness */ 670 desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); 671 desc->intf = intf; 672 INIT_WORK(&desc->rxwork, wdm_rxwork); 673 674 rv = -EINVAL; 675 iface = intf->cur_altsetting; 676 if (iface->desc.bNumEndpoints != 1) 677 goto err; 678 ep = &iface->endpoint[0].desc; 679 if (!ep || !usb_endpoint_is_int_in(ep)) 680 goto err; 681 682 desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize); 683 desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0; 684 685 desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 686 if (!desc->orq) 687 goto err; 688 desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 689 if (!desc->irq) 690 goto err; 691 692 desc->validity = usb_alloc_urb(0, GFP_KERNEL); 693 if (!desc->validity) 694 goto err; 695 696 desc->response = usb_alloc_urb(0, GFP_KERNEL); 697 if (!desc->response) 698 goto err; 699 700 desc->command = usb_alloc_urb(0, GFP_KERNEL); 701 if (!desc->command) 702 goto err; 703 704 desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); 705 if (!desc->ubuf) 706 goto err; 707 708 desc->sbuf = usb_alloc_coherent(interface_to_usbdev(intf), 709 desc->wMaxPacketSize, 710 GFP_KERNEL, 711 &desc->validity->transfer_dma); 712 if (!desc->sbuf) 713 goto err; 714 715 desc->inbuf = usb_alloc_coherent(interface_to_usbdev(intf), 716 desc->bMaxPacketSize0, 717 GFP_KERNEL, 718 &desc->response->transfer_dma); 719 if (!desc->inbuf) 720 goto err2; 721 722 usb_fill_int_urb( 723 desc->validity, 724 interface_to_usbdev(intf), 725 usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), 726 desc->sbuf, 727 desc->wMaxPacketSize, 728 wdm_int_callback, 729 desc, 730 ep->bInterval 731 ); 732 desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 733 734 usb_set_intfdata(intf, desc); 735 rv = usb_register_dev(intf, &wdm_class); 736 if (rv < 0) 737 goto err3; 738 else 739 dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n", 740 intf->minor - WDM_MINOR_BASE); 741out: 742 return rv; 743err3: 744 usb_set_intfdata(intf, NULL); 745 usb_free_coherent(interface_to_usbdev(desc->intf), 746 desc->bMaxPacketSize0, 747 desc->inbuf, 748 desc->response->transfer_dma); 749err2: 750 usb_free_coherent(interface_to_usbdev(desc->intf), 751 desc->wMaxPacketSize, 752 desc->sbuf, 753 desc->validity->transfer_dma); 754err: 755 free_urbs(desc); 756 kfree(desc->ubuf); 757 kfree(desc->orq); 758 kfree(desc->irq); 759 kfree(desc); 760 return rv; 761} 762 763static void wdm_disconnect(struct usb_interface *intf) 764{ 765 struct wdm_device *desc; 766 unsigned long flags; 767 768 usb_deregister_dev(intf, &wdm_class); 769 mutex_lock(&wdm_mutex); 770 desc = usb_get_intfdata(intf); 771 772 /* the spinlock makes sure no new urbs are generated in the callbacks */ 773 spin_lock_irqsave(&desc->iuspin, flags); 774 set_bit(WDM_DISCONNECTING, &desc->flags); 775 set_bit(WDM_READ, &desc->flags); 776 /* to terminate pending flushes */ 777 clear_bit(WDM_IN_USE, &desc->flags); 778 spin_unlock_irqrestore(&desc->iuspin, flags); 779 mutex_lock(&desc->lock); 780 kill_urbs(desc); 781 cancel_work_sync(&desc->rxwork); 782 mutex_unlock(&desc->lock); 783 wake_up_all(&desc->wait); 784 if (!desc->count) 785 cleanup(desc); 786 mutex_unlock(&wdm_mutex); 787} 788 789#ifdef CONFIG_PM 790static int wdm_suspend(struct usb_interface *intf, pm_message_t message) 791{ 792 struct wdm_device *desc = usb_get_intfdata(intf); 793 int rv = 0; 794 795 dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); 796 797 /* if this is an autosuspend the caller does the locking */ 798 if (!(message.event & PM_EVENT_AUTO)) 799 mutex_lock(&desc->lock); 800 spin_lock_irq(&desc->iuspin); 801 802 if ((message.event & PM_EVENT_AUTO) && 803 (test_bit(WDM_IN_USE, &desc->flags) 804 || test_bit(WDM_RESPONDING, &desc->flags))) { 805 spin_unlock_irq(&desc->iuspin); 806 rv = -EBUSY; 807 } else { 808 809 set_bit(WDM_SUSPENDING, &desc->flags); 810 spin_unlock_irq(&desc->iuspin); 811 /* callback submits work - order is essential */ 812 kill_urbs(desc); 813 cancel_work_sync(&desc->rxwork); 814 } 815 if (!(message.event & PM_EVENT_AUTO)) 816 mutex_unlock(&desc->lock); 817 818 return rv; 819} 820#endif 821 822static int recover_from_urb_loss(struct wdm_device *desc) 823{ 824 int rv = 0; 825 826 if (desc->count) { 827 rv = usb_submit_urb(desc->validity, GFP_NOIO); 828 if (rv < 0) 829 dev_err(&desc->intf->dev, 830 "Error resume submitting int urb - %d\n", rv); 831 } 832 return rv; 833} 834 835#ifdef CONFIG_PM 836static int wdm_resume(struct usb_interface *intf) 837{ 838 struct wdm_device *desc = usb_get_intfdata(intf); 839 int rv; 840 841 dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); 842 843 clear_bit(WDM_SUSPENDING, &desc->flags); 844 rv = recover_from_urb_loss(desc); 845 846 return rv; 847} 848#endif 849 850static int wdm_pre_reset(struct usb_interface *intf) 851{ 852 struct wdm_device *desc = usb_get_intfdata(intf); 853 854 mutex_lock(&desc->lock); 855 return 0; 856} 857 858static int wdm_post_reset(struct usb_interface *intf) 859{ 860 struct wdm_device *desc = usb_get_intfdata(intf); 861 int rv; 862 863 rv = recover_from_urb_loss(desc); 864 mutex_unlock(&desc->lock); 865 return 0; 866} 867 868static struct usb_driver wdm_driver = { 869 .name = "cdc_wdm", 870 .probe = wdm_probe, 871 .disconnect = wdm_disconnect, 872#ifdef CONFIG_PM 873 .suspend = wdm_suspend, 874 .resume = wdm_resume, 875 .reset_resume = wdm_resume, 876#endif 877 .pre_reset = wdm_pre_reset, 878 .post_reset = wdm_post_reset, 879 .id_table = wdm_ids, 880 .supports_autosuspend = 1, 881}; 882 883/* --- low level module stuff --- */ 884 885static int __init wdm_init(void) 886{ 887 int rv; 888 889 rv = usb_register(&wdm_driver); 890 891 return rv; 892} 893 894static void __exit wdm_exit(void) 895{ 896 usb_deregister(&wdm_driver); 897} 898 899module_init(wdm_init); 900module_exit(wdm_exit); 901 902MODULE_AUTHOR(DRIVER_AUTHOR); 903MODULE_DESCRIPTION(DRIVER_DESC); 904MODULE_LICENSE("GPL"); 905