1 /* 2 * f_phonet.c -- USB CDC Phonet function 3 * 4 * Copyright (C) 2007-2008 Nokia Corporation. All rights reserved. 5 * 6 * Author: Rémi Denis-Courmont 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * version 2 as published by the Free Software Foundation. 11 */ 12 13 #include <linux/mm.h> 14 #include <linux/slab.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/device.h> 18 19 #include <linux/netdevice.h> 20 #include <linux/if_ether.h> 21 #include <linux/if_phonet.h> 22 #include <linux/if_arp.h> 23 24 #include <linux/usb/ch9.h> 25 #include <linux/usb/cdc.h> 26 #include <linux/usb/composite.h> 27 28 #include "u_phonet.h" 29 #include "u_ether.h" 30 31 #define PN_MEDIA_USB 0x1B 32 #define MAXPACKET 512 33 #if (PAGE_SIZE % MAXPACKET) 34 #error MAXPACKET must divide PAGE_SIZE! 35 #endif 36 37 /*-------------------------------------------------------------------------*/ 38 39 struct phonet_port { 40 struct f_phonet *usb; 41 spinlock_t lock; 42 }; 43 44 struct f_phonet { 45 struct usb_function function; 46 struct { 47 struct sk_buff *skb; 48 spinlock_t lock; 49 } rx; 50 struct net_device *dev; 51 struct usb_ep *in_ep, *out_ep; 52 53 struct usb_request *in_req; 54 struct usb_request *out_reqv[0]; 55 }; 56 57 static int phonet_rxq_size = 17; 58 59 static inline struct f_phonet *func_to_pn(struct usb_function *f) 60 { 61 return container_of(f, struct f_phonet, function); 62 } 63 64 /*-------------------------------------------------------------------------*/ 65 66 #define USB_CDC_SUBCLASS_PHONET 0xfe 67 #define USB_CDC_PHONET_TYPE 0xab 68 69 static struct usb_interface_descriptor 70 pn_control_intf_desc = { 71 .bLength = sizeof pn_control_intf_desc, 72 .bDescriptorType = USB_DT_INTERFACE, 73 74 /* .bInterfaceNumber = DYNAMIC, */ 75 .bInterfaceClass = USB_CLASS_COMM, 76 .bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET, 77 }; 78 79 static const struct usb_cdc_header_desc 80 pn_header_desc = { 81 .bLength = sizeof pn_header_desc, 82 .bDescriptorType = USB_DT_CS_INTERFACE, 83 .bDescriptorSubType = USB_CDC_HEADER_TYPE, 84 .bcdCDC = cpu_to_le16(0x0110), 85 }; 86 87 static const struct usb_cdc_header_desc 88 pn_phonet_desc = { 89 .bLength = sizeof pn_phonet_desc, 90 .bDescriptorType = USB_DT_CS_INTERFACE, 91 .bDescriptorSubType = USB_CDC_PHONET_TYPE, 92 .bcdCDC = cpu_to_le16(0x1505), /* ??? */ 93 }; 94 95 static struct usb_cdc_union_desc 96 pn_union_desc = { 97 .bLength = sizeof pn_union_desc, 98 .bDescriptorType = USB_DT_CS_INTERFACE, 99 .bDescriptorSubType = USB_CDC_UNION_TYPE, 100 101 /* .bMasterInterface0 = DYNAMIC, */ 102 /* .bSlaveInterface0 = DYNAMIC, */ 103 }; 104 105 static struct usb_interface_descriptor 106 pn_data_nop_intf_desc = { 107 .bLength = sizeof pn_data_nop_intf_desc, 108 .bDescriptorType = USB_DT_INTERFACE, 109 110 /* .bInterfaceNumber = DYNAMIC, */ 111 .bAlternateSetting = 0, 112 .bNumEndpoints = 0, 113 .bInterfaceClass = USB_CLASS_CDC_DATA, 114 }; 115 116 static struct usb_interface_descriptor 117 pn_data_intf_desc = { 118 .bLength = sizeof pn_data_intf_desc, 119 .bDescriptorType = USB_DT_INTERFACE, 120 121 /* .bInterfaceNumber = DYNAMIC, */ 122 .bAlternateSetting = 1, 123 .bNumEndpoints = 2, 124 .bInterfaceClass = USB_CLASS_CDC_DATA, 125 }; 126 127 static struct usb_endpoint_descriptor 128 pn_fs_sink_desc = { 129 .bLength = USB_DT_ENDPOINT_SIZE, 130 .bDescriptorType = USB_DT_ENDPOINT, 131 132 .bEndpointAddress = USB_DIR_OUT, 133 .bmAttributes = USB_ENDPOINT_XFER_BULK, 134 }; 135 136 static struct usb_endpoint_descriptor 137 pn_hs_sink_desc = { 138 .bLength = USB_DT_ENDPOINT_SIZE, 139 .bDescriptorType = USB_DT_ENDPOINT, 140 141 .bEndpointAddress = USB_DIR_OUT, 142 .bmAttributes = USB_ENDPOINT_XFER_BULK, 143 .wMaxPacketSize = cpu_to_le16(MAXPACKET), 144 }; 145 146 static struct usb_endpoint_descriptor 147 pn_fs_source_desc = { 148 .bLength = USB_DT_ENDPOINT_SIZE, 149 .bDescriptorType = USB_DT_ENDPOINT, 150 151 .bEndpointAddress = USB_DIR_IN, 152 .bmAttributes = USB_ENDPOINT_XFER_BULK, 153 }; 154 155 static struct usb_endpoint_descriptor 156 pn_hs_source_desc = { 157 .bLength = USB_DT_ENDPOINT_SIZE, 158 .bDescriptorType = USB_DT_ENDPOINT, 159 160 .bEndpointAddress = USB_DIR_IN, 161 .bmAttributes = USB_ENDPOINT_XFER_BULK, 162 .wMaxPacketSize = cpu_to_le16(512), 163 }; 164 165 static struct usb_descriptor_header *fs_pn_function[] = { 166 (struct usb_descriptor_header *) &pn_control_intf_desc, 167 (struct usb_descriptor_header *) &pn_header_desc, 168 (struct usb_descriptor_header *) &pn_phonet_desc, 169 (struct usb_descriptor_header *) &pn_union_desc, 170 (struct usb_descriptor_header *) &pn_data_nop_intf_desc, 171 (struct usb_descriptor_header *) &pn_data_intf_desc, 172 (struct usb_descriptor_header *) &pn_fs_sink_desc, 173 (struct usb_descriptor_header *) &pn_fs_source_desc, 174 NULL, 175 }; 176 177 static struct usb_descriptor_header *hs_pn_function[] = { 178 (struct usb_descriptor_header *) &pn_control_intf_desc, 179 (struct usb_descriptor_header *) &pn_header_desc, 180 (struct usb_descriptor_header *) &pn_phonet_desc, 181 (struct usb_descriptor_header *) &pn_union_desc, 182 (struct usb_descriptor_header *) &pn_data_nop_intf_desc, 183 (struct usb_descriptor_header *) &pn_data_intf_desc, 184 (struct usb_descriptor_header *) &pn_hs_sink_desc, 185 (struct usb_descriptor_header *) &pn_hs_source_desc, 186 NULL, 187 }; 188 189 /*-------------------------------------------------------------------------*/ 190 191 static int pn_net_open(struct net_device *dev) 192 { 193 netif_wake_queue(dev); 194 return 0; 195 } 196 197 static int pn_net_close(struct net_device *dev) 198 { 199 netif_stop_queue(dev); 200 return 0; 201 } 202 203 static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req) 204 { 205 struct f_phonet *fp = ep->driver_data; 206 struct net_device *dev = fp->dev; 207 struct sk_buff *skb = req->context; 208 209 switch (req->status) { 210 case 0: 211 dev->stats.tx_packets++; 212 dev->stats.tx_bytes += skb->len; 213 break; 214 215 case -ESHUTDOWN: /* disconnected */ 216 case -ECONNRESET: /* disabled */ 217 dev->stats.tx_aborted_errors++; 218 default: 219 dev->stats.tx_errors++; 220 } 221 222 dev_kfree_skb_any(skb); 223 netif_wake_queue(dev); 224 } 225 226 static int pn_net_xmit(struct sk_buff *skb, struct net_device *dev) 227 { 228 struct phonet_port *port = netdev_priv(dev); 229 struct f_phonet *fp; 230 struct usb_request *req; 231 unsigned long flags; 232 233 if (skb->protocol != htons(ETH_P_PHONET)) 234 goto out; 235 236 spin_lock_irqsave(&port->lock, flags); 237 fp = port->usb; 238 if (unlikely(!fp)) /* race with carrier loss */ 239 goto out_unlock; 240 241 req = fp->in_req; 242 req->buf = skb->data; 243 req->length = skb->len; 244 req->complete = pn_tx_complete; 245 req->zero = 1; 246 req->context = skb; 247 248 if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC))) 249 goto out_unlock; 250 251 netif_stop_queue(dev); 252 skb = NULL; 253 254 out_unlock: 255 spin_unlock_irqrestore(&port->lock, flags); 256 out: 257 if (unlikely(skb)) { 258 dev_kfree_skb(skb); 259 dev->stats.tx_dropped++; 260 } 261 return NETDEV_TX_OK; 262 } 263 264 static const struct net_device_ops pn_netdev_ops = { 265 .ndo_open = pn_net_open, 266 .ndo_stop = pn_net_close, 267 .ndo_start_xmit = pn_net_xmit, 268 }; 269 270 static void pn_net_setup(struct net_device *dev) 271 { 272 dev->features = 0; 273 dev->type = ARPHRD_PHONET; 274 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 275 dev->mtu = PHONET_DEV_MTU; 276 dev->min_mtu = PHONET_MIN_MTU; 277 dev->max_mtu = PHONET_MAX_MTU; 278 dev->hard_header_len = 1; 279 dev->dev_addr[0] = PN_MEDIA_USB; 280 dev->addr_len = 1; 281 dev->tx_queue_len = 1; 282 283 dev->netdev_ops = &pn_netdev_ops; 284 dev->destructor = free_netdev; 285 dev->header_ops = &phonet_header_ops; 286 } 287 288 /*-------------------------------------------------------------------------*/ 289 290 /* 291 * Queue buffer for data from the host 292 */ 293 static int 294 pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags) 295 { 296 struct page *page; 297 int err; 298 299 page = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC); 300 if (!page) 301 return -ENOMEM; 302 303 req->buf = page_address(page); 304 req->length = PAGE_SIZE; 305 req->context = page; 306 307 err = usb_ep_queue(fp->out_ep, req, gfp_flags); 308 if (unlikely(err)) 309 put_page(page); 310 return err; 311 } 312 313 static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req) 314 { 315 struct f_phonet *fp = ep->driver_data; 316 struct net_device *dev = fp->dev; 317 struct page *page = req->context; 318 struct sk_buff *skb; 319 unsigned long flags; 320 int status = req->status; 321 322 switch (status) { 323 case 0: 324 spin_lock_irqsave(&fp->rx.lock, flags); 325 skb = fp->rx.skb; 326 if (!skb) 327 skb = fp->rx.skb = netdev_alloc_skb(dev, 12); 328 if (req->actual < req->length) /* Last fragment */ 329 fp->rx.skb = NULL; 330 spin_unlock_irqrestore(&fp->rx.lock, flags); 331 332 if (unlikely(!skb)) 333 break; 334 335 if (skb->len == 0) { /* First fragment */ 336 skb->protocol = htons(ETH_P_PHONET); 337 skb_reset_mac_header(skb); 338 /* Can't use pskb_pull() on page in IRQ */ 339 memcpy(skb_put(skb, 1), page_address(page), 1); 340 } 341 342 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 343 skb->len <= 1, req->actual, PAGE_SIZE); 344 page = NULL; 345 346 if (req->actual < req->length) { /* Last fragment */ 347 skb->dev = dev; 348 dev->stats.rx_packets++; 349 dev->stats.rx_bytes += skb->len; 350 351 netif_rx(skb); 352 } 353 break; 354 355 /* Do not resubmit in these cases: */ 356 case -ESHUTDOWN: /* disconnect */ 357 case -ECONNABORTED: /* hw reset */ 358 case -ECONNRESET: /* dequeued (unlink or netif down) */ 359 req = NULL; 360 break; 361 362 /* Do resubmit in these cases: */ 363 case -EOVERFLOW: /* request buffer overflow */ 364 dev->stats.rx_over_errors++; 365 default: 366 dev->stats.rx_errors++; 367 break; 368 } 369 370 if (page) 371 put_page(page); 372 if (req) 373 pn_rx_submit(fp, req, GFP_ATOMIC); 374 } 375 376 /*-------------------------------------------------------------------------*/ 377 378 static void __pn_reset(struct usb_function *f) 379 { 380 struct f_phonet *fp = func_to_pn(f); 381 struct net_device *dev = fp->dev; 382 struct phonet_port *port = netdev_priv(dev); 383 384 netif_carrier_off(dev); 385 port->usb = NULL; 386 387 usb_ep_disable(fp->out_ep); 388 usb_ep_disable(fp->in_ep); 389 if (fp->rx.skb) { 390 dev_kfree_skb_irq(fp->rx.skb); 391 fp->rx.skb = NULL; 392 } 393 } 394 395 static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 396 { 397 struct f_phonet *fp = func_to_pn(f); 398 struct usb_gadget *gadget = fp->function.config->cdev->gadget; 399 400 if (intf == pn_control_intf_desc.bInterfaceNumber) 401 /* control interface, no altsetting */ 402 return (alt > 0) ? -EINVAL : 0; 403 404 if (intf == pn_data_intf_desc.bInterfaceNumber) { 405 struct net_device *dev = fp->dev; 406 struct phonet_port *port = netdev_priv(dev); 407 408 /* data intf (0: inactive, 1: active) */ 409 if (alt > 1) 410 return -EINVAL; 411 412 spin_lock(&port->lock); 413 414 if (fp->in_ep->enabled) 415 __pn_reset(f); 416 417 if (alt == 1) { 418 int i; 419 420 if (config_ep_by_speed(gadget, f, fp->in_ep) || 421 config_ep_by_speed(gadget, f, fp->out_ep)) { 422 fp->in_ep->desc = NULL; 423 fp->out_ep->desc = NULL; 424 spin_unlock(&port->lock); 425 return -EINVAL; 426 } 427 usb_ep_enable(fp->out_ep); 428 usb_ep_enable(fp->in_ep); 429 430 port->usb = fp; 431 fp->out_ep->driver_data = fp; 432 fp->in_ep->driver_data = fp; 433 434 netif_carrier_on(dev); 435 for (i = 0; i < phonet_rxq_size; i++) 436 pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC); 437 } 438 spin_unlock(&port->lock); 439 return 0; 440 } 441 442 return -EINVAL; 443 } 444 445 static int pn_get_alt(struct usb_function *f, unsigned intf) 446 { 447 struct f_phonet *fp = func_to_pn(f); 448 449 if (intf == pn_control_intf_desc.bInterfaceNumber) 450 return 0; 451 452 if (intf == pn_data_intf_desc.bInterfaceNumber) { 453 struct phonet_port *port = netdev_priv(fp->dev); 454 u8 alt; 455 456 spin_lock(&port->lock); 457 alt = port->usb != NULL; 458 spin_unlock(&port->lock); 459 return alt; 460 } 461 462 return -EINVAL; 463 } 464 465 static void pn_disconnect(struct usb_function *f) 466 { 467 struct f_phonet *fp = func_to_pn(f); 468 struct phonet_port *port = netdev_priv(fp->dev); 469 unsigned long flags; 470 471 /* remain disabled until set_alt */ 472 spin_lock_irqsave(&port->lock, flags); 473 __pn_reset(f); 474 spin_unlock_irqrestore(&port->lock, flags); 475 } 476 477 /*-------------------------------------------------------------------------*/ 478 479 static int pn_bind(struct usb_configuration *c, struct usb_function *f) 480 { 481 struct usb_composite_dev *cdev = c->cdev; 482 struct usb_gadget *gadget = cdev->gadget; 483 struct f_phonet *fp = func_to_pn(f); 484 struct usb_ep *ep; 485 int status, i; 486 487 struct f_phonet_opts *phonet_opts; 488 489 phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst); 490 491 /* 492 * in drivers/usb/gadget/configfs.c:configfs_composite_bind() 493 * configurations are bound in sequence with list_for_each_entry, 494 * in each configuration its functions are bound in sequence 495 * with list_for_each_entry, so we assume no race condition 496 * with regard to phonet_opts->bound access 497 */ 498 if (!phonet_opts->bound) { 499 gphonet_set_gadget(phonet_opts->net, gadget); 500 status = gphonet_register_netdev(phonet_opts->net); 501 if (status) 502 return status; 503 phonet_opts->bound = true; 504 } 505 506 /* Reserve interface IDs */ 507 status = usb_interface_id(c, f); 508 if (status < 0) 509 goto err; 510 pn_control_intf_desc.bInterfaceNumber = status; 511 pn_union_desc.bMasterInterface0 = status; 512 513 status = usb_interface_id(c, f); 514 if (status < 0) 515 goto err; 516 pn_data_nop_intf_desc.bInterfaceNumber = status; 517 pn_data_intf_desc.bInterfaceNumber = status; 518 pn_union_desc.bSlaveInterface0 = status; 519 520 /* Reserve endpoints */ 521 status = -ENODEV; 522 ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc); 523 if (!ep) 524 goto err; 525 fp->out_ep = ep; 526 527 ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc); 528 if (!ep) 529 goto err; 530 fp->in_ep = ep; 531 532 pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress; 533 pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress; 534 535 /* Do not try to bind Phonet twice... */ 536 status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function, 537 NULL, NULL); 538 if (status) 539 goto err; 540 541 /* Incoming USB requests */ 542 status = -ENOMEM; 543 for (i = 0; i < phonet_rxq_size; i++) { 544 struct usb_request *req; 545 546 req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL); 547 if (!req) 548 goto err_req; 549 550 req->complete = pn_rx_complete; 551 fp->out_reqv[i] = req; 552 } 553 554 /* Outgoing USB requests */ 555 fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL); 556 if (!fp->in_req) 557 goto err_req; 558 559 INFO(cdev, "USB CDC Phonet function\n"); 560 INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name, 561 fp->out_ep->name, fp->in_ep->name); 562 return 0; 563 564 err_req: 565 for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++) 566 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]); 567 usb_free_all_descriptors(f); 568 err: 569 ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n"); 570 return status; 571 } 572 573 static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item) 574 { 575 return container_of(to_config_group(item), struct f_phonet_opts, 576 func_inst.group); 577 } 578 579 static void phonet_attr_release(struct config_item *item) 580 { 581 struct f_phonet_opts *opts = to_f_phonet_opts(item); 582 583 usb_put_function_instance(&opts->func_inst); 584 } 585 586 static struct configfs_item_operations phonet_item_ops = { 587 .release = phonet_attr_release, 588 }; 589 590 static ssize_t f_phonet_ifname_show(struct config_item *item, char *page) 591 { 592 return gether_get_ifname(to_f_phonet_opts(item)->net, page, PAGE_SIZE); 593 } 594 595 CONFIGFS_ATTR_RO(f_phonet_, ifname); 596 597 static struct configfs_attribute *phonet_attrs[] = { 598 &f_phonet_attr_ifname, 599 NULL, 600 }; 601 602 static struct config_item_type phonet_func_type = { 603 .ct_item_ops = &phonet_item_ops, 604 .ct_attrs = phonet_attrs, 605 .ct_owner = THIS_MODULE, 606 }; 607 608 static void phonet_free_inst(struct usb_function_instance *f) 609 { 610 struct f_phonet_opts *opts; 611 612 opts = container_of(f, struct f_phonet_opts, func_inst); 613 if (opts->bound) 614 gphonet_cleanup(opts->net); 615 else 616 free_netdev(opts->net); 617 kfree(opts); 618 } 619 620 static struct usb_function_instance *phonet_alloc_inst(void) 621 { 622 struct f_phonet_opts *opts; 623 624 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 625 if (!opts) 626 return ERR_PTR(-ENOMEM); 627 628 opts->func_inst.free_func_inst = phonet_free_inst; 629 opts->net = gphonet_setup_default(); 630 if (IS_ERR(opts->net)) { 631 struct net_device *net = opts->net; 632 kfree(opts); 633 return ERR_CAST(net); 634 } 635 636 config_group_init_type_name(&opts->func_inst.group, "", 637 &phonet_func_type); 638 639 return &opts->func_inst; 640 } 641 642 static void phonet_free(struct usb_function *f) 643 { 644 struct f_phonet *phonet; 645 646 phonet = func_to_pn(f); 647 kfree(phonet); 648 } 649 650 static void pn_unbind(struct usb_configuration *c, struct usb_function *f) 651 { 652 struct f_phonet *fp = func_to_pn(f); 653 int i; 654 655 /* We are already disconnected */ 656 if (fp->in_req) 657 usb_ep_free_request(fp->in_ep, fp->in_req); 658 for (i = 0; i < phonet_rxq_size; i++) 659 if (fp->out_reqv[i]) 660 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]); 661 662 usb_free_all_descriptors(f); 663 } 664 665 static struct usb_function *phonet_alloc(struct usb_function_instance *fi) 666 { 667 struct f_phonet *fp; 668 struct f_phonet_opts *opts; 669 int size; 670 671 size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *)); 672 fp = kzalloc(size, GFP_KERNEL); 673 if (!fp) 674 return ERR_PTR(-ENOMEM); 675 676 opts = container_of(fi, struct f_phonet_opts, func_inst); 677 678 fp->dev = opts->net; 679 fp->function.name = "phonet"; 680 fp->function.bind = pn_bind; 681 fp->function.unbind = pn_unbind; 682 fp->function.set_alt = pn_set_alt; 683 fp->function.get_alt = pn_get_alt; 684 fp->function.disable = pn_disconnect; 685 fp->function.free_func = phonet_free; 686 spin_lock_init(&fp->rx.lock); 687 688 return &fp->function; 689 } 690 691 struct net_device *gphonet_setup_default(void) 692 { 693 struct net_device *dev; 694 struct phonet_port *port; 695 696 /* Create net device */ 697 dev = alloc_netdev(sizeof(*port), "upnlink%d", NET_NAME_UNKNOWN, 698 pn_net_setup); 699 if (!dev) 700 return ERR_PTR(-ENOMEM); 701 702 port = netdev_priv(dev); 703 spin_lock_init(&port->lock); 704 netif_carrier_off(dev); 705 706 return dev; 707 } 708 709 void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g) 710 { 711 SET_NETDEV_DEV(net, &g->dev); 712 } 713 714 int gphonet_register_netdev(struct net_device *net) 715 { 716 int status; 717 718 status = register_netdev(net); 719 if (status) 720 free_netdev(net); 721 722 return status; 723 } 724 725 void gphonet_cleanup(struct net_device *dev) 726 { 727 unregister_netdev(dev); 728 } 729 730 DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc); 731 MODULE_AUTHOR("Rémi Denis-Courmont"); 732 MODULE_LICENSE("GPL"); 733