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 34 static struct usb_device_id wdm_ids[] = { 35 { 36 .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS | 37 USB_DEVICE_ID_MATCH_INT_SUBCLASS, 38 .bInterfaceClass = USB_CLASS_COMM, 39 .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM 40 }, 41 { } 42 }; 43 44 MODULE_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 56 57 #define WDM_MAX 16 58 59 60 static DEFINE_MUTEX(wdm_mutex); 61 62 /* --- method tables --- */ 63 64 struct wdm_device { 65 u8 *inbuf; /* buffer for response */ 66 u8 *outbuf; /* buffer for command */ 67 u8 *sbuf; /* buffer for status */ 68 u8 *ubuf; /* buffer for copy to user space */ 69 70 struct urb *command; 71 struct urb *response; 72 struct urb *validity; 73 struct usb_interface *intf; 74 struct usb_ctrlrequest *orq; 75 struct usb_ctrlrequest *irq; 76 spinlock_t iuspin; 77 78 unsigned long flags; 79 u16 bufsize; 80 u16 wMaxCommand; 81 u16 wMaxPacketSize; 82 u16 bMaxPacketSize0; 83 __le16 inum; 84 int reslength; 85 int length; 86 int read; 87 int count; 88 dma_addr_t shandle; 89 dma_addr_t ihandle; 90 struct mutex wlock; 91 struct mutex rlock; 92 struct mutex plock; 93 wait_queue_head_t wait; 94 struct work_struct rxwork; 95 int werr; 96 int rerr; 97 }; 98 99 static struct usb_driver wdm_driver; 100 101 /* --- callbacks --- */ 102 static void wdm_out_callback(struct urb *urb) 103 { 104 struct wdm_device *desc; 105 desc = urb->context; 106 spin_lock(&desc->iuspin); 107 desc->werr = urb->status; 108 spin_unlock(&desc->iuspin); 109 clear_bit(WDM_IN_USE, &desc->flags); 110 kfree(desc->outbuf); 111 wake_up(&desc->wait); 112 } 113 114 static void wdm_in_callback(struct urb *urb) 115 { 116 struct wdm_device *desc = urb->context; 117 int status = urb->status; 118 119 spin_lock(&desc->iuspin); 120 121 if (status) { 122 switch (status) { 123 case -ENOENT: 124 dev_dbg(&desc->intf->dev, 125 "nonzero urb status received: -ENOENT"); 126 break; 127 case -ECONNRESET: 128 dev_dbg(&desc->intf->dev, 129 "nonzero urb status received: -ECONNRESET"); 130 break; 131 case -ESHUTDOWN: 132 dev_dbg(&desc->intf->dev, 133 "nonzero urb status received: -ESHUTDOWN"); 134 break; 135 case -EPIPE: 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; 150 wake_up(&desc->wait); 151 152 set_bit(WDM_READ, &desc->flags); 153 spin_unlock(&desc->iuspin); 154 } 155 156 static void wdm_int_callback(struct urb *urb) 157 { 158 int rv = 0; 159 int status = urb->status; 160 struct wdm_device *desc; 161 struct usb_ctrlrequest *req; 162 struct usb_cdc_notification *dr; 163 164 desc = urb->context; 165 req = desc->irq; 166 dr = (struct usb_cdc_notification *)desc->sbuf; 167 168 if (status) { 169 switch (status) { 170 case -ESHUTDOWN: 171 case -ENOENT: 172 case -ECONNRESET: 173 return; /* unplug */ 174 case -EPIPE: 175 set_bit(WDM_INT_STALL, &desc->flags); 176 dev_err(&desc->intf->dev, "Stall on int endpoint\n"); 177 goto sw; /* halt is cleared in work */ 178 default: 179 dev_err(&desc->intf->dev, 180 "nonzero urb status received: %d\n", status); 181 break; 182 } 183 } 184 185 if (urb->actual_length < sizeof(struct usb_cdc_notification)) { 186 dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n", 187 urb->actual_length); 188 goto exit; 189 } 190 191 switch (dr->bNotificationType) { 192 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: 193 dev_dbg(&desc->intf->dev, 194 "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d", 195 dr->wIndex, dr->wLength); 196 break; 197 198 case USB_CDC_NOTIFY_NETWORK_CONNECTION: 199 200 dev_dbg(&desc->intf->dev, 201 "NOTIFY_NETWORK_CONNECTION %s network", 202 dr->wValue ? "connected to" : "disconnected from"); 203 goto exit; 204 default: 205 clear_bit(WDM_POLL_RUNNING, &desc->flags); 206 dev_err(&desc->intf->dev, 207 "unknown notification %d received: index %d len %d\n", 208 dr->bNotificationType, dr->wIndex, dr->wLength); 209 goto exit; 210 } 211 212 req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); 213 req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; 214 req->wValue = 0; 215 req->wIndex = desc->inum; 216 req->wLength = cpu_to_le16(desc->wMaxCommand); 217 218 usb_fill_control_urb( 219 desc->response, 220 interface_to_usbdev(desc->intf), 221 /* using common endpoint 0 */ 222 usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), 223 (unsigned char *)req, 224 desc->inbuf, 225 desc->wMaxCommand, 226 wdm_in_callback, 227 desc 228 ); 229 desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 230 spin_lock(&desc->iuspin); 231 clear_bit(WDM_READ, &desc->flags); 232 if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { 233 rv = usb_submit_urb(desc->response, GFP_ATOMIC); 234 dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d", 235 __func__, rv); 236 } 237 spin_unlock(&desc->iuspin); 238 if (rv < 0) { 239 if (rv == -EPERM) 240 return; 241 if (rv == -ENOMEM) { 242 sw: 243 rv = schedule_work(&desc->rxwork); 244 if (rv) 245 dev_err(&desc->intf->dev, 246 "Cannot schedule work\n"); 247 } 248 } 249 exit: 250 rv = usb_submit_urb(urb, GFP_ATOMIC); 251 if (rv) 252 dev_err(&desc->intf->dev, 253 "%s - usb_submit_urb failed with result %d\n", 254 __func__, rv); 255 256 } 257 258 static void kill_urbs(struct wdm_device *desc) 259 { 260 /* the order here is essential */ 261 usb_kill_urb(desc->command); 262 usb_kill_urb(desc->validity); 263 usb_kill_urb(desc->response); 264 } 265 266 static void free_urbs(struct wdm_device *desc) 267 { 268 usb_free_urb(desc->validity); 269 usb_free_urb(desc->response); 270 usb_free_urb(desc->command); 271 } 272 273 static void cleanup(struct wdm_device *desc) 274 { 275 usb_buffer_free(interface_to_usbdev(desc->intf), 276 desc->wMaxPacketSize, 277 desc->sbuf, 278 desc->validity->transfer_dma); 279 usb_buffer_free(interface_to_usbdev(desc->intf), 280 desc->wMaxCommand, 281 desc->inbuf, 282 desc->response->transfer_dma); 283 kfree(desc->orq); 284 kfree(desc->irq); 285 kfree(desc->ubuf); 286 free_urbs(desc); 287 kfree(desc); 288 } 289 290 static ssize_t wdm_write 291 (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 292 { 293 u8 *buf; 294 int rv = -EMSGSIZE, r, we; 295 struct wdm_device *desc = file->private_data; 296 struct usb_ctrlrequest *req; 297 298 if (count > desc->wMaxCommand) 299 count = desc->wMaxCommand; 300 301 spin_lock_irq(&desc->iuspin); 302 we = desc->werr; 303 desc->werr = 0; 304 spin_unlock_irq(&desc->iuspin); 305 if (we < 0) 306 return -EIO; 307 308 r = mutex_lock_interruptible(&desc->wlock); /* concurrent writes */ 309 rv = -ERESTARTSYS; 310 if (r) 311 goto outnl; 312 313 r = usb_autopm_get_interface(desc->intf); 314 if (r < 0) 315 goto outnp; 316 317 if (!file->f_flags && O_NONBLOCK) 318 r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, 319 &desc->flags)); 320 else 321 if (test_bit(WDM_IN_USE, &desc->flags)) 322 r = -EAGAIN; 323 if (r < 0) 324 goto out; 325 326 if (test_bit(WDM_DISCONNECTING, &desc->flags)) { 327 rv = -ENODEV; 328 goto out; 329 } 330 331 desc->outbuf = buf = kmalloc(count, GFP_KERNEL); 332 if (!buf) { 333 rv = -ENOMEM; 334 goto out; 335 } 336 337 r = copy_from_user(buf, buffer, count); 338 if (r > 0) { 339 kfree(buf); 340 rv = -EFAULT; 341 goto out; 342 } 343 344 req = desc->orq; 345 usb_fill_control_urb( 346 desc->command, 347 interface_to_usbdev(desc->intf), 348 /* using common endpoint 0 */ 349 usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), 350 (unsigned char *)req, 351 buf, 352 count, 353 wdm_out_callback, 354 desc 355 ); 356 357 req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | 358 USB_RECIP_INTERFACE); 359 req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; 360 req->wValue = 0; 361 req->wIndex = desc->inum; 362 req->wLength = cpu_to_le16(count); 363 set_bit(WDM_IN_USE, &desc->flags); 364 365 rv = usb_submit_urb(desc->command, GFP_KERNEL); 366 if (rv < 0) { 367 kfree(buf); 368 clear_bit(WDM_IN_USE, &desc->flags); 369 dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); 370 } else { 371 dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", 372 req->wIndex); 373 } 374 out: 375 usb_autopm_put_interface(desc->intf); 376 outnp: 377 mutex_unlock(&desc->wlock); 378 outnl: 379 return rv < 0 ? rv : count; 380 } 381 382 static ssize_t wdm_read 383 (struct file *file, char __user *buffer, size_t count, loff_t *ppos) 384 { 385 int rv, cntr = 0; 386 int i = 0; 387 struct wdm_device *desc = file->private_data; 388 389 390 rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ 391 if (rv < 0) 392 return -ERESTARTSYS; 393 394 if (desc->length == 0) { 395 desc->read = 0; 396 retry: 397 if (test_bit(WDM_DISCONNECTING, &desc->flags)) { 398 rv = -ENODEV; 399 goto err; 400 } 401 i++; 402 if (file->f_flags & O_NONBLOCK) { 403 if (!test_bit(WDM_READ, &desc->flags)) { 404 rv = cntr ? cntr : -EAGAIN; 405 goto err; 406 } 407 rv = 0; 408 } else { 409 rv = wait_event_interruptible(desc->wait, 410 test_bit(WDM_READ, &desc->flags)); 411 } 412 413 /* may have happened while we slept */ 414 if (test_bit(WDM_DISCONNECTING, &desc->flags)) { 415 rv = -ENODEV; 416 goto err; 417 } 418 usb_mark_last_busy(interface_to_usbdev(desc->intf)); 419 if (rv < 0) { 420 rv = -ERESTARTSYS; 421 goto err; 422 } 423 424 spin_lock_irq(&desc->iuspin); 425 426 if (desc->rerr) { /* read completed, error happened */ 427 int t = desc->rerr; 428 desc->rerr = 0; 429 spin_unlock_irq(&desc->iuspin); 430 dev_err(&desc->intf->dev, 431 "reading had resulted in %d\n", t); 432 rv = -EIO; 433 goto err; 434 } 435 /* 436 * recheck whether we've lost the race 437 * against the completion handler 438 */ 439 if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ 440 spin_unlock_irq(&desc->iuspin); 441 goto retry; 442 } 443 if (!desc->reslength) { /* zero length read */ 444 spin_unlock_irq(&desc->iuspin); 445 goto retry; 446 } 447 clear_bit(WDM_READ, &desc->flags); 448 spin_unlock_irq(&desc->iuspin); 449 } 450 451 cntr = count > desc->length ? desc->length : count; 452 rv = copy_to_user(buffer, desc->ubuf, cntr); 453 if (rv > 0) { 454 rv = -EFAULT; 455 goto err; 456 } 457 458 for (i = 0; i < desc->length - cntr; i++) 459 desc->ubuf[i] = desc->ubuf[i + cntr]; 460 461 desc->length -= cntr; 462 /* in case we had outstanding data */ 463 if (!desc->length) 464 clear_bit(WDM_READ, &desc->flags); 465 rv = cntr; 466 467 err: 468 mutex_unlock(&desc->rlock); 469 if (rv < 0 && rv != -EAGAIN) 470 dev_err(&desc->intf->dev, "wdm_read: exit error\n"); 471 return rv; 472 } 473 474 static int wdm_flush(struct file *file, fl_owner_t id) 475 { 476 struct wdm_device *desc = file->private_data; 477 478 wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); 479 if (desc->werr < 0) 480 dev_err(&desc->intf->dev, "Error in flush path: %d\n", 481 desc->werr); 482 483 return desc->werr; 484 } 485 486 static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) 487 { 488 struct wdm_device *desc = file->private_data; 489 unsigned long flags; 490 unsigned int mask = 0; 491 492 spin_lock_irqsave(&desc->iuspin, flags); 493 if (test_bit(WDM_DISCONNECTING, &desc->flags)) { 494 mask = POLLERR; 495 spin_unlock_irqrestore(&desc->iuspin, flags); 496 goto desc_out; 497 } 498 if (test_bit(WDM_READ, &desc->flags)) 499 mask = POLLIN | POLLRDNORM; 500 if (desc->rerr || desc->werr) 501 mask |= POLLERR; 502 if (!test_bit(WDM_IN_USE, &desc->flags)) 503 mask |= POLLOUT | POLLWRNORM; 504 spin_unlock_irqrestore(&desc->iuspin, flags); 505 506 poll_wait(file, &desc->wait, wait); 507 508 desc_out: 509 return mask; 510 } 511 512 static int wdm_open(struct inode *inode, struct file *file) 513 { 514 int minor = iminor(inode); 515 int rv = -ENODEV; 516 struct usb_interface *intf; 517 struct wdm_device *desc; 518 519 mutex_lock(&wdm_mutex); 520 intf = usb_find_interface(&wdm_driver, minor); 521 if (!intf) 522 goto out; 523 524 desc = usb_get_intfdata(intf); 525 if (test_bit(WDM_DISCONNECTING, &desc->flags)) 526 goto out; 527 file->private_data = desc; 528 529 rv = usb_autopm_get_interface(desc->intf); 530 if (rv < 0) { 531 dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); 532 goto out; 533 } 534 intf->needs_remote_wakeup = 1; 535 536 mutex_lock(&desc->plock); 537 if (!desc->count++) { 538 rv = usb_submit_urb(desc->validity, GFP_KERNEL); 539 if (rv < 0) { 540 desc->count--; 541 dev_err(&desc->intf->dev, 542 "Error submitting int urb - %d\n", rv); 543 } 544 } else { 545 rv = 0; 546 } 547 mutex_unlock(&desc->plock); 548 usb_autopm_put_interface(desc->intf); 549 out: 550 mutex_unlock(&wdm_mutex); 551 return rv; 552 } 553 554 static int wdm_release(struct inode *inode, struct file *file) 555 { 556 struct wdm_device *desc = file->private_data; 557 558 mutex_lock(&wdm_mutex); 559 mutex_lock(&desc->plock); 560 desc->count--; 561 mutex_unlock(&desc->plock); 562 563 if (!desc->count) { 564 dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); 565 kill_urbs(desc); 566 if (!test_bit(WDM_DISCONNECTING, &desc->flags)) 567 desc->intf->needs_remote_wakeup = 0; 568 } 569 mutex_unlock(&wdm_mutex); 570 return 0; 571 } 572 573 static const struct file_operations wdm_fops = { 574 .owner = THIS_MODULE, 575 .read = wdm_read, 576 .write = wdm_write, 577 .open = wdm_open, 578 .flush = wdm_flush, 579 .release = wdm_release, 580 .poll = wdm_poll 581 }; 582 583 static struct usb_class_driver wdm_class = { 584 .name = "cdc-wdm%d", 585 .fops = &wdm_fops, 586 .minor_base = WDM_MINOR_BASE, 587 }; 588 589 /* --- error handling --- */ 590 static void wdm_rxwork(struct work_struct *work) 591 { 592 struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); 593 unsigned long flags; 594 int rv; 595 596 spin_lock_irqsave(&desc->iuspin, flags); 597 if (test_bit(WDM_DISCONNECTING, &desc->flags)) { 598 spin_unlock_irqrestore(&desc->iuspin, flags); 599 } else { 600 spin_unlock_irqrestore(&desc->iuspin, flags); 601 rv = usb_submit_urb(desc->response, GFP_KERNEL); 602 if (rv < 0 && rv != -EPERM) { 603 spin_lock_irqsave(&desc->iuspin, flags); 604 if (!test_bit(WDM_DISCONNECTING, &desc->flags)) 605 schedule_work(&desc->rxwork); 606 spin_unlock_irqrestore(&desc->iuspin, flags); 607 } 608 } 609 } 610 611 /* --- hotplug --- */ 612 613 static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) 614 { 615 int rv = -EINVAL; 616 struct usb_device *udev = interface_to_usbdev(intf); 617 struct wdm_device *desc; 618 struct usb_host_interface *iface; 619 struct usb_endpoint_descriptor *ep; 620 struct usb_cdc_dmm_desc *dmhd; 621 u8 *buffer = intf->altsetting->extra; 622 int buflen = intf->altsetting->extralen; 623 u16 maxcom = 0; 624 625 if (!buffer) 626 goto out; 627 628 while (buflen > 2) { 629 if (buffer [1] != USB_DT_CS_INTERFACE) { 630 dev_err(&intf->dev, "skipping garbage\n"); 631 goto next_desc; 632 } 633 634 switch (buffer [2]) { 635 case USB_CDC_HEADER_TYPE: 636 break; 637 case USB_CDC_DMM_TYPE: 638 dmhd = (struct usb_cdc_dmm_desc *)buffer; 639 maxcom = le16_to_cpu(dmhd->wMaxCommand); 640 dev_dbg(&intf->dev, 641 "Finding maximum buffer length: %d", maxcom); 642 break; 643 default: 644 dev_err(&intf->dev, 645 "Ignoring extra header, type %d, length %d\n", 646 buffer[2], buffer[0]); 647 break; 648 } 649 next_desc: 650 buflen -= buffer[0]; 651 buffer += buffer[0]; 652 } 653 654 rv = -ENOMEM; 655 desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); 656 if (!desc) 657 goto out; 658 mutex_init(&desc->wlock); 659 mutex_init(&desc->rlock); 660 mutex_init(&desc->plock); 661 spin_lock_init(&desc->iuspin); 662 init_waitqueue_head(&desc->wait); 663 desc->wMaxCommand = maxcom; 664 /* this will be expanded and needed in hardware endianness */ 665 desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); 666 desc->intf = intf; 667 INIT_WORK(&desc->rxwork, wdm_rxwork); 668 669 rv = -EINVAL; 670 iface = intf->cur_altsetting; 671 if (iface->desc.bNumEndpoints != 1) 672 goto err; 673 ep = &iface->endpoint[0].desc; 674 if (!ep || !usb_endpoint_is_int_in(ep)) 675 goto err; 676 677 desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize); 678 desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0; 679 680 desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 681 if (!desc->orq) 682 goto err; 683 desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 684 if (!desc->irq) 685 goto err; 686 687 desc->validity = usb_alloc_urb(0, GFP_KERNEL); 688 if (!desc->validity) 689 goto err; 690 691 desc->response = usb_alloc_urb(0, GFP_KERNEL); 692 if (!desc->response) 693 goto err; 694 695 desc->command = usb_alloc_urb(0, GFP_KERNEL); 696 if (!desc->command) 697 goto err; 698 699 desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); 700 if (!desc->ubuf) 701 goto err; 702 703 desc->sbuf = usb_buffer_alloc(interface_to_usbdev(intf), 704 desc->wMaxPacketSize, 705 GFP_KERNEL, 706 &desc->validity->transfer_dma); 707 if (!desc->sbuf) 708 goto err; 709 710 desc->inbuf = usb_buffer_alloc(interface_to_usbdev(intf), 711 desc->bMaxPacketSize0, 712 GFP_KERNEL, 713 &desc->response->transfer_dma); 714 if (!desc->inbuf) 715 goto err2; 716 717 usb_fill_int_urb( 718 desc->validity, 719 interface_to_usbdev(intf), 720 usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), 721 desc->sbuf, 722 desc->wMaxPacketSize, 723 wdm_int_callback, 724 desc, 725 ep->bInterval 726 ); 727 desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 728 729 usb_set_intfdata(intf, desc); 730 rv = usb_register_dev(intf, &wdm_class); 731 if (rv < 0) 732 goto err3; 733 else 734 dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n", 735 intf->minor - WDM_MINOR_BASE); 736 out: 737 return rv; 738 err3: 739 usb_set_intfdata(intf, NULL); 740 usb_buffer_free(interface_to_usbdev(desc->intf), 741 desc->bMaxPacketSize0, 742 desc->inbuf, 743 desc->response->transfer_dma); 744 err2: 745 usb_buffer_free(interface_to_usbdev(desc->intf), 746 desc->wMaxPacketSize, 747 desc->sbuf, 748 desc->validity->transfer_dma); 749 err: 750 free_urbs(desc); 751 kfree(desc->ubuf); 752 kfree(desc->orq); 753 kfree(desc->irq); 754 kfree(desc); 755 return rv; 756 } 757 758 static void wdm_disconnect(struct usb_interface *intf) 759 { 760 struct wdm_device *desc; 761 unsigned long flags; 762 763 usb_deregister_dev(intf, &wdm_class); 764 mutex_lock(&wdm_mutex); 765 desc = usb_get_intfdata(intf); 766 767 /* the spinlock makes sure no new urbs are generated in the callbacks */ 768 spin_lock_irqsave(&desc->iuspin, flags); 769 set_bit(WDM_DISCONNECTING, &desc->flags); 770 set_bit(WDM_READ, &desc->flags); 771 /* to terminate pending flushes */ 772 clear_bit(WDM_IN_USE, &desc->flags); 773 spin_unlock_irqrestore(&desc->iuspin, flags); 774 cancel_work_sync(&desc->rxwork); 775 kill_urbs(desc); 776 wake_up_all(&desc->wait); 777 if (!desc->count) 778 cleanup(desc); 779 mutex_unlock(&wdm_mutex); 780 } 781 782 static int wdm_suspend(struct usb_interface *intf, pm_message_t message) 783 { 784 struct wdm_device *desc = usb_get_intfdata(intf); 785 int rv = 0; 786 787 dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); 788 789 mutex_lock(&desc->plock); 790 #ifdef CONFIG_PM 791 if ((message.event & PM_EVENT_AUTO) && 792 test_bit(WDM_IN_USE, &desc->flags)) { 793 rv = -EBUSY; 794 } else { 795 #endif 796 cancel_work_sync(&desc->rxwork); 797 kill_urbs(desc); 798 #ifdef CONFIG_PM 799 } 800 #endif 801 mutex_unlock(&desc->plock); 802 803 return rv; 804 } 805 806 static int recover_from_urb_loss(struct wdm_device *desc) 807 { 808 int rv = 0; 809 810 if (desc->count) { 811 rv = usb_submit_urb(desc->validity, GFP_NOIO); 812 if (rv < 0) 813 dev_err(&desc->intf->dev, 814 "Error resume submitting int urb - %d\n", rv); 815 } 816 return rv; 817 } 818 static int wdm_resume(struct usb_interface *intf) 819 { 820 struct wdm_device *desc = usb_get_intfdata(intf); 821 int rv; 822 823 dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); 824 mutex_lock(&desc->plock); 825 rv = recover_from_urb_loss(desc); 826 mutex_unlock(&desc->plock); 827 return rv; 828 } 829 830 static int wdm_pre_reset(struct usb_interface *intf) 831 { 832 struct wdm_device *desc = usb_get_intfdata(intf); 833 834 mutex_lock(&desc->plock); 835 return 0; 836 } 837 838 static int wdm_post_reset(struct usb_interface *intf) 839 { 840 struct wdm_device *desc = usb_get_intfdata(intf); 841 int rv; 842 843 rv = recover_from_urb_loss(desc); 844 mutex_unlock(&desc->plock); 845 return 0; 846 } 847 848 static struct usb_driver wdm_driver = { 849 .name = "cdc_wdm", 850 .probe = wdm_probe, 851 .disconnect = wdm_disconnect, 852 .suspend = wdm_suspend, 853 .resume = wdm_resume, 854 .reset_resume = wdm_resume, 855 .pre_reset = wdm_pre_reset, 856 .post_reset = wdm_post_reset, 857 .id_table = wdm_ids, 858 .supports_autosuspend = 1, 859 }; 860 861 /* --- low level module stuff --- */ 862 863 static int __init wdm_init(void) 864 { 865 int rv; 866 867 rv = usb_register(&wdm_driver); 868 869 return rv; 870 } 871 872 static void __exit wdm_exit(void) 873 { 874 usb_deregister(&wdm_driver); 875 } 876 877 module_init(wdm_init); 878 module_exit(wdm_exit); 879 880 MODULE_AUTHOR(DRIVER_AUTHOR); 881 MODULE_DESCRIPTION(DRIVER_DESC); 882 MODULE_LICENSE("GPL"); 883