1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * f_phonet.c -- USB CDC Phonet function 4 * 5 * Copyright (C) 2007-2008 Nokia Corporation. All rights reserved. 6 * 7 * Author: Rémi Denis-Courmont 8 */ 9 10 #include <linux/mm.h> 11 #include <linux/slab.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/device.h> 15 16 #include <linux/netdevice.h> 17 #include <linux/if_ether.h> 18 #include <linux/if_phonet.h> 19 #include <linux/if_arp.h> 20 21 #include <linux/usb/ch9.h> 22 #include <linux/usb/cdc.h> 23 #include <linux/usb/composite.h> 24 25 #include "u_phonet.h" 26 #include "u_ether.h" 27 28 #define PN_MEDIA_USB 0x1B 29 #define MAXPACKET 512 30 #if (PAGE_SIZE % MAXPACKET) 31 #error MAXPACKET must divide PAGE_SIZE! 32 #endif 33 34 /*-------------------------------------------------------------------------*/ 35 36 struct phonet_port { 37 struct f_phonet *usb; 38 spinlock_t lock; 39 }; 40 41 struct f_phonet { 42 struct usb_function function; 43 struct { 44 struct sk_buff *skb; 45 spinlock_t lock; 46 } rx; 47 struct net_device *dev; 48 struct usb_ep *in_ep, *out_ep; 49 50 struct usb_request *in_req; 51 struct usb_request *out_reqv[0]; 52 }; 53 54 static int phonet_rxq_size = 17; 55 56 static inline struct f_phonet *func_to_pn(struct usb_function *f) 57 { 58 return container_of(f, struct f_phonet, function); 59 } 60 61 /*-------------------------------------------------------------------------*/ 62 63 #define USB_CDC_SUBCLASS_PHONET 0xfe 64 #define USB_CDC_PHONET_TYPE 0xab 65 66 static struct usb_interface_descriptor 67 pn_control_intf_desc = { 68 .bLength = sizeof pn_control_intf_desc, 69 .bDescriptorType = USB_DT_INTERFACE, 70 71 /* .bInterfaceNumber = DYNAMIC, */ 72 .bInterfaceClass = USB_CLASS_COMM, 73 .bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET, 74 }; 75 76 static const struct usb_cdc_header_desc 77 pn_header_desc = { 78 .bLength = sizeof pn_header_desc, 79 .bDescriptorType = USB_DT_CS_INTERFACE, 80 .bDescriptorSubType = USB_CDC_HEADER_TYPE, 81 .bcdCDC = cpu_to_le16(0x0110), 82 }; 83 84 static const struct usb_cdc_header_desc 85 pn_phonet_desc = { 86 .bLength = sizeof pn_phonet_desc, 87 .bDescriptorType = USB_DT_CS_INTERFACE, 88 .bDescriptorSubType = USB_CDC_PHONET_TYPE, 89 .bcdCDC = cpu_to_le16(0x1505), /* ??? */ 90 }; 91 92 static struct usb_cdc_union_desc 93 pn_union_desc = { 94 .bLength = sizeof pn_union_desc, 95 .bDescriptorType = USB_DT_CS_INTERFACE, 96 .bDescriptorSubType = USB_CDC_UNION_TYPE, 97 98 /* .bMasterInterface0 = DYNAMIC, */ 99 /* .bSlaveInterface0 = DYNAMIC, */ 100 }; 101 102 static struct usb_interface_descriptor 103 pn_data_nop_intf_desc = { 104 .bLength = sizeof pn_data_nop_intf_desc, 105 .bDescriptorType = USB_DT_INTERFACE, 106 107 /* .bInterfaceNumber = DYNAMIC, */ 108 .bAlternateSetting = 0, 109 .bNumEndpoints = 0, 110 .bInterfaceClass = USB_CLASS_CDC_DATA, 111 }; 112 113 static struct usb_interface_descriptor 114 pn_data_intf_desc = { 115 .bLength = sizeof pn_data_intf_desc, 116 .bDescriptorType = USB_DT_INTERFACE, 117 118 /* .bInterfaceNumber = DYNAMIC, */ 119 .bAlternateSetting = 1, 120 .bNumEndpoints = 2, 121 .bInterfaceClass = USB_CLASS_CDC_DATA, 122 }; 123 124 static struct usb_endpoint_descriptor 125 pn_fs_sink_desc = { 126 .bLength = USB_DT_ENDPOINT_SIZE, 127 .bDescriptorType = USB_DT_ENDPOINT, 128 129 .bEndpointAddress = USB_DIR_OUT, 130 .bmAttributes = USB_ENDPOINT_XFER_BULK, 131 }; 132 133 static struct usb_endpoint_descriptor 134 pn_hs_sink_desc = { 135 .bLength = USB_DT_ENDPOINT_SIZE, 136 .bDescriptorType = USB_DT_ENDPOINT, 137 138 .bEndpointAddress = USB_DIR_OUT, 139 .bmAttributes = USB_ENDPOINT_XFER_BULK, 140 .wMaxPacketSize = cpu_to_le16(MAXPACKET), 141 }; 142 143 static struct usb_endpoint_descriptor 144 pn_fs_source_desc = { 145 .bLength = USB_DT_ENDPOINT_SIZE, 146 .bDescriptorType = USB_DT_ENDPOINT, 147 148 .bEndpointAddress = USB_DIR_IN, 149 .bmAttributes = USB_ENDPOINT_XFER_BULK, 150 }; 151 152 static struct usb_endpoint_descriptor 153 pn_hs_source_desc = { 154 .bLength = USB_DT_ENDPOINT_SIZE, 155 .bDescriptorType = USB_DT_ENDPOINT, 156 157 .bEndpointAddress = USB_DIR_IN, 158 .bmAttributes = USB_ENDPOINT_XFER_BULK, 159 .wMaxPacketSize = cpu_to_le16(512), 160 }; 161 162 static struct usb_descriptor_header *fs_pn_function[] = { 163 (struct usb_descriptor_header *) &pn_control_intf_desc, 164 (struct usb_descriptor_header *) &pn_header_desc, 165 (struct usb_descriptor_header *) &pn_phonet_desc, 166 (struct usb_descriptor_header *) &pn_union_desc, 167 (struct usb_descriptor_header *) &pn_data_nop_intf_desc, 168 (struct usb_descriptor_header *) &pn_data_intf_desc, 169 (struct usb_descriptor_header *) &pn_fs_sink_desc, 170 (struct usb_descriptor_header *) &pn_fs_source_desc, 171 NULL, 172 }; 173 174 static struct usb_descriptor_header *hs_pn_function[] = { 175 (struct usb_descriptor_header *) &pn_control_intf_desc, 176 (struct usb_descriptor_header *) &pn_header_desc, 177 (struct usb_descriptor_header *) &pn_phonet_desc, 178 (struct usb_descriptor_header *) &pn_union_desc, 179 (struct usb_descriptor_header *) &pn_data_nop_intf_desc, 180 (struct usb_descriptor_header *) &pn_data_intf_desc, 181 (struct usb_descriptor_header *) &pn_hs_sink_desc, 182 (struct usb_descriptor_header *) &pn_hs_source_desc, 183 NULL, 184 }; 185 186 /*-------------------------------------------------------------------------*/ 187 188 static int pn_net_open(struct net_device *dev) 189 { 190 netif_wake_queue(dev); 191 return 0; 192 } 193 194 static int pn_net_close(struct net_device *dev) 195 { 196 netif_stop_queue(dev); 197 return 0; 198 } 199 200 static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req) 201 { 202 struct f_phonet *fp = ep->driver_data; 203 struct net_device *dev = fp->dev; 204 struct sk_buff *skb = req->context; 205 206 switch (req->status) { 207 case 0: 208 dev->stats.tx_packets++; 209 dev->stats.tx_bytes += skb->len; 210 break; 211 212 case -ESHUTDOWN: /* disconnected */ 213 case -ECONNRESET: /* disabled */ 214 dev->stats.tx_aborted_errors++; 215 /* fall through */ 216 default: 217 dev->stats.tx_errors++; 218 } 219 220 dev_kfree_skb_any(skb); 221 netif_wake_queue(dev); 222 } 223 224 static netdev_tx_t pn_net_xmit(struct sk_buff *skb, struct net_device *dev) 225 { 226 struct phonet_port *port = netdev_priv(dev); 227 struct f_phonet *fp; 228 struct usb_request *req; 229 unsigned long flags; 230 231 if (skb->protocol != htons(ETH_P_PHONET)) 232 goto out; 233 234 spin_lock_irqsave(&port->lock, flags); 235 fp = port->usb; 236 if (unlikely(!fp)) /* race with carrier loss */ 237 goto out_unlock; 238 239 req = fp->in_req; 240 req->buf = skb->data; 241 req->length = skb->len; 242 req->complete = pn_tx_complete; 243 req->zero = 1; 244 req->context = skb; 245 246 if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC))) 247 goto out_unlock; 248 249 netif_stop_queue(dev); 250 skb = NULL; 251 252 out_unlock: 253 spin_unlock_irqrestore(&port->lock, flags); 254 out: 255 if (unlikely(skb)) { 256 dev_kfree_skb(skb); 257 dev->stats.tx_dropped++; 258 } 259 return NETDEV_TX_OK; 260 } 261 262 static const struct net_device_ops pn_netdev_ops = { 263 .ndo_open = pn_net_open, 264 .ndo_stop = pn_net_close, 265 .ndo_start_xmit = pn_net_xmit, 266 }; 267 268 static void pn_net_setup(struct net_device *dev) 269 { 270 dev->features = 0; 271 dev->type = ARPHRD_PHONET; 272 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 273 dev->mtu = PHONET_DEV_MTU; 274 dev->min_mtu = PHONET_MIN_MTU; 275 dev->max_mtu = PHONET_MAX_MTU; 276 dev->hard_header_len = 1; 277 dev->dev_addr[0] = PN_MEDIA_USB; 278 dev->addr_len = 1; 279 dev->tx_queue_len = 1; 280 281 dev->netdev_ops = &pn_netdev_ops; 282 dev->needs_free_netdev = true; 283 dev->header_ops = &phonet_header_ops; 284 } 285 286 /*-------------------------------------------------------------------------*/ 287 288 /* 289 * Queue buffer for data from the host 290 */ 291 static int 292 pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags) 293 { 294 struct page *page; 295 int err; 296 297 page = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC); 298 if (!page) 299 return -ENOMEM; 300 301 req->buf = page_address(page); 302 req->length = PAGE_SIZE; 303 req->context = page; 304 305 err = usb_ep_queue(fp->out_ep, req, gfp_flags); 306 if (unlikely(err)) 307 put_page(page); 308 return err; 309 } 310 311 static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req) 312 { 313 struct f_phonet *fp = ep->driver_data; 314 struct net_device *dev = fp->dev; 315 struct page *page = req->context; 316 struct sk_buff *skb; 317 unsigned long flags; 318 int status = req->status; 319 320 switch (status) { 321 case 0: 322 spin_lock_irqsave(&fp->rx.lock, flags); 323 skb = fp->rx.skb; 324 if (!skb) 325 skb = fp->rx.skb = netdev_alloc_skb(dev, 12); 326 if (req->actual < req->length) /* Last fragment */ 327 fp->rx.skb = NULL; 328 spin_unlock_irqrestore(&fp->rx.lock, flags); 329 330 if (unlikely(!skb)) 331 break; 332 333 if (skb->len == 0) { /* First fragment */ 334 skb->protocol = htons(ETH_P_PHONET); 335 skb_reset_mac_header(skb); 336 /* Can't use pskb_pull() on page in IRQ */ 337 skb_put_data(skb, page_address(page), 1); 338 } 339 340 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 341 skb->len <= 1, req->actual, PAGE_SIZE); 342 page = NULL; 343 344 if (req->actual < req->length) { /* Last fragment */ 345 skb->dev = dev; 346 dev->stats.rx_packets++; 347 dev->stats.rx_bytes += skb->len; 348 349 netif_rx(skb); 350 } 351 break; 352 353 /* Do not resubmit in these cases: */ 354 case -ESHUTDOWN: /* disconnect */ 355 case -ECONNABORTED: /* hw reset */ 356 case -ECONNRESET: /* dequeued (unlink or netif down) */ 357 req = NULL; 358 break; 359 360 /* Do resubmit in these cases: */ 361 case -EOVERFLOW: /* request buffer overflow */ 362 dev->stats.rx_over_errors++; 363 /* fall through */ 364 default: 365 dev->stats.rx_errors++; 366 break; 367 } 368 369 if (page) 370 put_page(page); 371 if (req) 372 pn_rx_submit(fp, req, GFP_ATOMIC); 373 } 374 375 /*-------------------------------------------------------------------------*/ 376 377 static void __pn_reset(struct usb_function *f) 378 { 379 struct f_phonet *fp = func_to_pn(f); 380 struct net_device *dev = fp->dev; 381 struct phonet_port *port = netdev_priv(dev); 382 383 netif_carrier_off(dev); 384 port->usb = NULL; 385 386 usb_ep_disable(fp->out_ep); 387 usb_ep_disable(fp->in_ep); 388 if (fp->rx.skb) { 389 dev_kfree_skb_irq(fp->rx.skb); 390 fp->rx.skb = NULL; 391 } 392 } 393 394 static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 395 { 396 struct f_phonet *fp = func_to_pn(f); 397 struct usb_gadget *gadget = fp->function.config->cdev->gadget; 398 399 if (intf == pn_control_intf_desc.bInterfaceNumber) 400 /* control interface, no altsetting */ 401 return (alt > 0) ? -EINVAL : 0; 402 403 if (intf == pn_data_intf_desc.bInterfaceNumber) { 404 struct net_device *dev = fp->dev; 405 struct phonet_port *port = netdev_priv(dev); 406 407 /* data intf (0: inactive, 1: active) */ 408 if (alt > 1) 409 return -EINVAL; 410 411 spin_lock(&port->lock); 412 413 if (fp->in_ep->enabled) 414 __pn_reset(f); 415 416 if (alt == 1) { 417 int i; 418 419 if (config_ep_by_speed(gadget, f, fp->in_ep) || 420 config_ep_by_speed(gadget, f, fp->out_ep)) { 421 fp->in_ep->desc = NULL; 422 fp->out_ep->desc = NULL; 423 spin_unlock(&port->lock); 424 return -EINVAL; 425 } 426 usb_ep_enable(fp->out_ep); 427 usb_ep_enable(fp->in_ep); 428 429 port->usb = fp; 430 fp->out_ep->driver_data = fp; 431 fp->in_ep->driver_data = fp; 432 433 netif_carrier_on(dev); 434 for (i = 0; i < phonet_rxq_size; i++) 435 pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC); 436 } 437 spin_unlock(&port->lock); 438 return 0; 439 } 440 441 return -EINVAL; 442 } 443 444 static int pn_get_alt(struct usb_function *f, unsigned intf) 445 { 446 struct f_phonet *fp = func_to_pn(f); 447 448 if (intf == pn_control_intf_desc.bInterfaceNumber) 449 return 0; 450 451 if (intf == pn_data_intf_desc.bInterfaceNumber) { 452 struct phonet_port *port = netdev_priv(fp->dev); 453 u8 alt; 454 455 spin_lock(&port->lock); 456 alt = port->usb != NULL; 457 spin_unlock(&port->lock); 458 return alt; 459 } 460 461 return -EINVAL; 462 } 463 464 static void pn_disconnect(struct usb_function *f) 465 { 466 struct f_phonet *fp = func_to_pn(f); 467 struct phonet_port *port = netdev_priv(fp->dev); 468 unsigned long flags; 469 470 /* remain disabled until set_alt */ 471 spin_lock_irqsave(&port->lock, flags); 472 __pn_reset(f); 473 spin_unlock_irqrestore(&port->lock, flags); 474 } 475 476 /*-------------------------------------------------------------------------*/ 477 478 static int pn_bind(struct usb_configuration *c, struct usb_function *f) 479 { 480 struct usb_composite_dev *cdev = c->cdev; 481 struct usb_gadget *gadget = cdev->gadget; 482 struct f_phonet *fp = func_to_pn(f); 483 struct usb_ep *ep; 484 int status, i; 485 486 struct f_phonet_opts *phonet_opts; 487 488 phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst); 489 490 /* 491 * in drivers/usb/gadget/configfs.c:configfs_composite_bind() 492 * configurations are bound in sequence with list_for_each_entry, 493 * in each configuration its functions are bound in sequence 494 * with list_for_each_entry, so we assume no race condition 495 * with regard to phonet_opts->bound access 496 */ 497 if (!phonet_opts->bound) { 498 gphonet_set_gadget(phonet_opts->net, gadget); 499 status = gphonet_register_netdev(phonet_opts->net); 500 if (status) 501 return status; 502 phonet_opts->bound = true; 503 } 504 505 /* Reserve interface IDs */ 506 status = usb_interface_id(c, f); 507 if (status < 0) 508 goto err; 509 pn_control_intf_desc.bInterfaceNumber = status; 510 pn_union_desc.bMasterInterface0 = status; 511 512 status = usb_interface_id(c, f); 513 if (status < 0) 514 goto err; 515 pn_data_nop_intf_desc.bInterfaceNumber = status; 516 pn_data_intf_desc.bInterfaceNumber = status; 517 pn_union_desc.bSlaveInterface0 = status; 518 519 /* Reserve endpoints */ 520 status = -ENODEV; 521 ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc); 522 if (!ep) 523 goto err; 524 fp->out_ep = ep; 525 526 ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc); 527 if (!ep) 528 goto err; 529 fp->in_ep = ep; 530 531 pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress; 532 pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress; 533 534 /* Do not try to bind Phonet twice... */ 535 status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function, 536 NULL, NULL); 537 if (status) 538 goto err; 539 540 /* Incoming USB requests */ 541 status = -ENOMEM; 542 for (i = 0; i < phonet_rxq_size; i++) { 543 struct usb_request *req; 544 545 req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL); 546 if (!req) 547 goto err_req; 548 549 req->complete = pn_rx_complete; 550 fp->out_reqv[i] = req; 551 } 552 553 /* Outgoing USB requests */ 554 fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL); 555 if (!fp->in_req) 556 goto err_req; 557 558 INFO(cdev, "USB CDC Phonet function\n"); 559 INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name, 560 fp->out_ep->name, fp->in_ep->name); 561 return 0; 562 563 err_req: 564 for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++) 565 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]); 566 usb_free_all_descriptors(f); 567 err: 568 ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n"); 569 return status; 570 } 571 572 static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item) 573 { 574 return container_of(to_config_group(item), struct f_phonet_opts, 575 func_inst.group); 576 } 577 578 static void phonet_attr_release(struct config_item *item) 579 { 580 struct f_phonet_opts *opts = to_f_phonet_opts(item); 581 582 usb_put_function_instance(&opts->func_inst); 583 } 584 585 static struct configfs_item_operations phonet_item_ops = { 586 .release = phonet_attr_release, 587 }; 588 589 static ssize_t f_phonet_ifname_show(struct config_item *item, char *page) 590 { 591 return gether_get_ifname(to_f_phonet_opts(item)->net, page, PAGE_SIZE); 592 } 593 594 CONFIGFS_ATTR_RO(f_phonet_, ifname); 595 596 static struct configfs_attribute *phonet_attrs[] = { 597 &f_phonet_attr_ifname, 598 NULL, 599 }; 600 601 static const struct config_item_type phonet_func_type = { 602 .ct_item_ops = &phonet_item_ops, 603 .ct_attrs = phonet_attrs, 604 .ct_owner = THIS_MODULE, 605 }; 606 607 static void phonet_free_inst(struct usb_function_instance *f) 608 { 609 struct f_phonet_opts *opts; 610 611 opts = container_of(f, struct f_phonet_opts, func_inst); 612 if (opts->bound) 613 gphonet_cleanup(opts->net); 614 else 615 free_netdev(opts->net); 616 kfree(opts); 617 } 618 619 static struct usb_function_instance *phonet_alloc_inst(void) 620 { 621 struct f_phonet_opts *opts; 622 623 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 624 if (!opts) 625 return ERR_PTR(-ENOMEM); 626 627 opts->func_inst.free_func_inst = phonet_free_inst; 628 opts->net = gphonet_setup_default(); 629 if (IS_ERR(opts->net)) { 630 struct net_device *net = opts->net; 631 kfree(opts); 632 return ERR_CAST(net); 633 } 634 635 config_group_init_type_name(&opts->func_inst.group, "", 636 &phonet_func_type); 637 638 return &opts->func_inst; 639 } 640 641 static void phonet_free(struct usb_function *f) 642 { 643 struct f_phonet *phonet; 644 645 phonet = func_to_pn(f); 646 kfree(phonet); 647 } 648 649 static void pn_unbind(struct usb_configuration *c, struct usb_function *f) 650 { 651 struct f_phonet *fp = func_to_pn(f); 652 int i; 653 654 /* We are already disconnected */ 655 if (fp->in_req) 656 usb_ep_free_request(fp->in_ep, fp->in_req); 657 for (i = 0; i < phonet_rxq_size; i++) 658 if (fp->out_reqv[i]) 659 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]); 660 661 usb_free_all_descriptors(f); 662 } 663 664 static struct usb_function *phonet_alloc(struct usb_function_instance *fi) 665 { 666 struct f_phonet *fp; 667 struct f_phonet_opts *opts; 668 int size; 669 670 size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *)); 671 fp = kzalloc(size, GFP_KERNEL); 672 if (!fp) 673 return ERR_PTR(-ENOMEM); 674 675 opts = container_of(fi, struct f_phonet_opts, func_inst); 676 677 fp->dev = opts->net; 678 fp->function.name = "phonet"; 679 fp->function.bind = pn_bind; 680 fp->function.unbind = pn_unbind; 681 fp->function.set_alt = pn_set_alt; 682 fp->function.get_alt = pn_get_alt; 683 fp->function.disable = pn_disconnect; 684 fp->function.free_func = phonet_free; 685 spin_lock_init(&fp->rx.lock); 686 687 return &fp->function; 688 } 689 690 struct net_device *gphonet_setup_default(void) 691 { 692 struct net_device *dev; 693 struct phonet_port *port; 694 695 /* Create net device */ 696 dev = alloc_netdev(sizeof(*port), "upnlink%d", NET_NAME_UNKNOWN, 697 pn_net_setup); 698 if (!dev) 699 return ERR_PTR(-ENOMEM); 700 701 port = netdev_priv(dev); 702 spin_lock_init(&port->lock); 703 netif_carrier_off(dev); 704 705 return dev; 706 } 707 708 void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g) 709 { 710 SET_NETDEV_DEV(net, &g->dev); 711 } 712 713 int gphonet_register_netdev(struct net_device *net) 714 { 715 int status; 716 717 status = register_netdev(net); 718 if (status) 719 free_netdev(net); 720 721 return status; 722 } 723 724 void gphonet_cleanup(struct net_device *dev) 725 { 726 unregister_netdev(dev); 727 } 728 729 DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc); 730 MODULE_AUTHOR("Rémi Denis-Courmont"); 731 MODULE_LICENSE("GPL"); 732