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 /* fall through */ 219 default: 220 dev->stats.tx_errors++; 221 } 222 223 dev_kfree_skb_any(skb); 224 netif_wake_queue(dev); 225 } 226 227 static int pn_net_xmit(struct sk_buff *skb, struct net_device *dev) 228 { 229 struct phonet_port *port = netdev_priv(dev); 230 struct f_phonet *fp; 231 struct usb_request *req; 232 unsigned long flags; 233 234 if (skb->protocol != htons(ETH_P_PHONET)) 235 goto out; 236 237 spin_lock_irqsave(&port->lock, flags); 238 fp = port->usb; 239 if (unlikely(!fp)) /* race with carrier loss */ 240 goto out_unlock; 241 242 req = fp->in_req; 243 req->buf = skb->data; 244 req->length = skb->len; 245 req->complete = pn_tx_complete; 246 req->zero = 1; 247 req->context = skb; 248 249 if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC))) 250 goto out_unlock; 251 252 netif_stop_queue(dev); 253 skb = NULL; 254 255 out_unlock: 256 spin_unlock_irqrestore(&port->lock, flags); 257 out: 258 if (unlikely(skb)) { 259 dev_kfree_skb(skb); 260 dev->stats.tx_dropped++; 261 } 262 return NETDEV_TX_OK; 263 } 264 265 static const struct net_device_ops pn_netdev_ops = { 266 .ndo_open = pn_net_open, 267 .ndo_stop = pn_net_close, 268 .ndo_start_xmit = pn_net_xmit, 269 }; 270 271 static void pn_net_setup(struct net_device *dev) 272 { 273 dev->features = 0; 274 dev->type = ARPHRD_PHONET; 275 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 276 dev->mtu = PHONET_DEV_MTU; 277 dev->min_mtu = PHONET_MIN_MTU; 278 dev->max_mtu = PHONET_MAX_MTU; 279 dev->hard_header_len = 1; 280 dev->dev_addr[0] = PN_MEDIA_USB; 281 dev->addr_len = 1; 282 dev->tx_queue_len = 1; 283 284 dev->netdev_ops = &pn_netdev_ops; 285 dev->needs_free_netdev = true; 286 dev->header_ops = &phonet_header_ops; 287 } 288 289 /*-------------------------------------------------------------------------*/ 290 291 /* 292 * Queue buffer for data from the host 293 */ 294 static int 295 pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags) 296 { 297 struct page *page; 298 int err; 299 300 page = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC); 301 if (!page) 302 return -ENOMEM; 303 304 req->buf = page_address(page); 305 req->length = PAGE_SIZE; 306 req->context = page; 307 308 err = usb_ep_queue(fp->out_ep, req, gfp_flags); 309 if (unlikely(err)) 310 put_page(page); 311 return err; 312 } 313 314 static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req) 315 { 316 struct f_phonet *fp = ep->driver_data; 317 struct net_device *dev = fp->dev; 318 struct page *page = req->context; 319 struct sk_buff *skb; 320 unsigned long flags; 321 int status = req->status; 322 323 switch (status) { 324 case 0: 325 spin_lock_irqsave(&fp->rx.lock, flags); 326 skb = fp->rx.skb; 327 if (!skb) 328 skb = fp->rx.skb = netdev_alloc_skb(dev, 12); 329 if (req->actual < req->length) /* Last fragment */ 330 fp->rx.skb = NULL; 331 spin_unlock_irqrestore(&fp->rx.lock, flags); 332 333 if (unlikely(!skb)) 334 break; 335 336 if (skb->len == 0) { /* First fragment */ 337 skb->protocol = htons(ETH_P_PHONET); 338 skb_reset_mac_header(skb); 339 /* Can't use pskb_pull() on page in IRQ */ 340 skb_put_data(skb, page_address(page), 1); 341 } 342 343 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 344 skb->len <= 1, req->actual, PAGE_SIZE); 345 page = NULL; 346 347 if (req->actual < req->length) { /* Last fragment */ 348 skb->dev = dev; 349 dev->stats.rx_packets++; 350 dev->stats.rx_bytes += skb->len; 351 352 netif_rx(skb); 353 } 354 break; 355 356 /* Do not resubmit in these cases: */ 357 case -ESHUTDOWN: /* disconnect */ 358 case -ECONNABORTED: /* hw reset */ 359 case -ECONNRESET: /* dequeued (unlink or netif down) */ 360 req = NULL; 361 break; 362 363 /* Do resubmit in these cases: */ 364 case -EOVERFLOW: /* request buffer overflow */ 365 dev->stats.rx_over_errors++; 366 /* fall through */ 367 default: 368 dev->stats.rx_errors++; 369 break; 370 } 371 372 if (page) 373 put_page(page); 374 if (req) 375 pn_rx_submit(fp, req, GFP_ATOMIC); 376 } 377 378 /*-------------------------------------------------------------------------*/ 379 380 static void __pn_reset(struct usb_function *f) 381 { 382 struct f_phonet *fp = func_to_pn(f); 383 struct net_device *dev = fp->dev; 384 struct phonet_port *port = netdev_priv(dev); 385 386 netif_carrier_off(dev); 387 port->usb = NULL; 388 389 usb_ep_disable(fp->out_ep); 390 usb_ep_disable(fp->in_ep); 391 if (fp->rx.skb) { 392 dev_kfree_skb_irq(fp->rx.skb); 393 fp->rx.skb = NULL; 394 } 395 } 396 397 static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 398 { 399 struct f_phonet *fp = func_to_pn(f); 400 struct usb_gadget *gadget = fp->function.config->cdev->gadget; 401 402 if (intf == pn_control_intf_desc.bInterfaceNumber) 403 /* control interface, no altsetting */ 404 return (alt > 0) ? -EINVAL : 0; 405 406 if (intf == pn_data_intf_desc.bInterfaceNumber) { 407 struct net_device *dev = fp->dev; 408 struct phonet_port *port = netdev_priv(dev); 409 410 /* data intf (0: inactive, 1: active) */ 411 if (alt > 1) 412 return -EINVAL; 413 414 spin_lock(&port->lock); 415 416 if (fp->in_ep->enabled) 417 __pn_reset(f); 418 419 if (alt == 1) { 420 int i; 421 422 if (config_ep_by_speed(gadget, f, fp->in_ep) || 423 config_ep_by_speed(gadget, f, fp->out_ep)) { 424 fp->in_ep->desc = NULL; 425 fp->out_ep->desc = NULL; 426 spin_unlock(&port->lock); 427 return -EINVAL; 428 } 429 usb_ep_enable(fp->out_ep); 430 usb_ep_enable(fp->in_ep); 431 432 port->usb = fp; 433 fp->out_ep->driver_data = fp; 434 fp->in_ep->driver_data = fp; 435 436 netif_carrier_on(dev); 437 for (i = 0; i < phonet_rxq_size; i++) 438 pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC); 439 } 440 spin_unlock(&port->lock); 441 return 0; 442 } 443 444 return -EINVAL; 445 } 446 447 static int pn_get_alt(struct usb_function *f, unsigned intf) 448 { 449 struct f_phonet *fp = func_to_pn(f); 450 451 if (intf == pn_control_intf_desc.bInterfaceNumber) 452 return 0; 453 454 if (intf == pn_data_intf_desc.bInterfaceNumber) { 455 struct phonet_port *port = netdev_priv(fp->dev); 456 u8 alt; 457 458 spin_lock(&port->lock); 459 alt = port->usb != NULL; 460 spin_unlock(&port->lock); 461 return alt; 462 } 463 464 return -EINVAL; 465 } 466 467 static void pn_disconnect(struct usb_function *f) 468 { 469 struct f_phonet *fp = func_to_pn(f); 470 struct phonet_port *port = netdev_priv(fp->dev); 471 unsigned long flags; 472 473 /* remain disabled until set_alt */ 474 spin_lock_irqsave(&port->lock, flags); 475 __pn_reset(f); 476 spin_unlock_irqrestore(&port->lock, flags); 477 } 478 479 /*-------------------------------------------------------------------------*/ 480 481 static int pn_bind(struct usb_configuration *c, struct usb_function *f) 482 { 483 struct usb_composite_dev *cdev = c->cdev; 484 struct usb_gadget *gadget = cdev->gadget; 485 struct f_phonet *fp = func_to_pn(f); 486 struct usb_ep *ep; 487 int status, i; 488 489 struct f_phonet_opts *phonet_opts; 490 491 phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst); 492 493 /* 494 * in drivers/usb/gadget/configfs.c:configfs_composite_bind() 495 * configurations are bound in sequence with list_for_each_entry, 496 * in each configuration its functions are bound in sequence 497 * with list_for_each_entry, so we assume no race condition 498 * with regard to phonet_opts->bound access 499 */ 500 if (!phonet_opts->bound) { 501 gphonet_set_gadget(phonet_opts->net, gadget); 502 status = gphonet_register_netdev(phonet_opts->net); 503 if (status) 504 return status; 505 phonet_opts->bound = true; 506 } 507 508 /* Reserve interface IDs */ 509 status = usb_interface_id(c, f); 510 if (status < 0) 511 goto err; 512 pn_control_intf_desc.bInterfaceNumber = status; 513 pn_union_desc.bMasterInterface0 = status; 514 515 status = usb_interface_id(c, f); 516 if (status < 0) 517 goto err; 518 pn_data_nop_intf_desc.bInterfaceNumber = status; 519 pn_data_intf_desc.bInterfaceNumber = status; 520 pn_union_desc.bSlaveInterface0 = status; 521 522 /* Reserve endpoints */ 523 status = -ENODEV; 524 ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc); 525 if (!ep) 526 goto err; 527 fp->out_ep = ep; 528 529 ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc); 530 if (!ep) 531 goto err; 532 fp->in_ep = ep; 533 534 pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress; 535 pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress; 536 537 /* Do not try to bind Phonet twice... */ 538 status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function, 539 NULL, NULL); 540 if (status) 541 goto err; 542 543 /* Incoming USB requests */ 544 status = -ENOMEM; 545 for (i = 0; i < phonet_rxq_size; i++) { 546 struct usb_request *req; 547 548 req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL); 549 if (!req) 550 goto err_req; 551 552 req->complete = pn_rx_complete; 553 fp->out_reqv[i] = req; 554 } 555 556 /* Outgoing USB requests */ 557 fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL); 558 if (!fp->in_req) 559 goto err_req; 560 561 INFO(cdev, "USB CDC Phonet function\n"); 562 INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name, 563 fp->out_ep->name, fp->in_ep->name); 564 return 0; 565 566 err_req: 567 for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++) 568 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]); 569 usb_free_all_descriptors(f); 570 err: 571 ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n"); 572 return status; 573 } 574 575 static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item) 576 { 577 return container_of(to_config_group(item), struct f_phonet_opts, 578 func_inst.group); 579 } 580 581 static void phonet_attr_release(struct config_item *item) 582 { 583 struct f_phonet_opts *opts = to_f_phonet_opts(item); 584 585 usb_put_function_instance(&opts->func_inst); 586 } 587 588 static struct configfs_item_operations phonet_item_ops = { 589 .release = phonet_attr_release, 590 }; 591 592 static ssize_t f_phonet_ifname_show(struct config_item *item, char *page) 593 { 594 return gether_get_ifname(to_f_phonet_opts(item)->net, page, PAGE_SIZE); 595 } 596 597 CONFIGFS_ATTR_RO(f_phonet_, ifname); 598 599 static struct configfs_attribute *phonet_attrs[] = { 600 &f_phonet_attr_ifname, 601 NULL, 602 }; 603 604 static struct config_item_type phonet_func_type = { 605 .ct_item_ops = &phonet_item_ops, 606 .ct_attrs = phonet_attrs, 607 .ct_owner = THIS_MODULE, 608 }; 609 610 static void phonet_free_inst(struct usb_function_instance *f) 611 { 612 struct f_phonet_opts *opts; 613 614 opts = container_of(f, struct f_phonet_opts, func_inst); 615 if (opts->bound) 616 gphonet_cleanup(opts->net); 617 else 618 free_netdev(opts->net); 619 kfree(opts); 620 } 621 622 static struct usb_function_instance *phonet_alloc_inst(void) 623 { 624 struct f_phonet_opts *opts; 625 626 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 627 if (!opts) 628 return ERR_PTR(-ENOMEM); 629 630 opts->func_inst.free_func_inst = phonet_free_inst; 631 opts->net = gphonet_setup_default(); 632 if (IS_ERR(opts->net)) { 633 struct net_device *net = opts->net; 634 kfree(opts); 635 return ERR_CAST(net); 636 } 637 638 config_group_init_type_name(&opts->func_inst.group, "", 639 &phonet_func_type); 640 641 return &opts->func_inst; 642 } 643 644 static void phonet_free(struct usb_function *f) 645 { 646 struct f_phonet *phonet; 647 648 phonet = func_to_pn(f); 649 kfree(phonet); 650 } 651 652 static void pn_unbind(struct usb_configuration *c, struct usb_function *f) 653 { 654 struct f_phonet *fp = func_to_pn(f); 655 int i; 656 657 /* We are already disconnected */ 658 if (fp->in_req) 659 usb_ep_free_request(fp->in_ep, fp->in_req); 660 for (i = 0; i < phonet_rxq_size; i++) 661 if (fp->out_reqv[i]) 662 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]); 663 664 usb_free_all_descriptors(f); 665 } 666 667 static struct usb_function *phonet_alloc(struct usb_function_instance *fi) 668 { 669 struct f_phonet *fp; 670 struct f_phonet_opts *opts; 671 int size; 672 673 size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *)); 674 fp = kzalloc(size, GFP_KERNEL); 675 if (!fp) 676 return ERR_PTR(-ENOMEM); 677 678 opts = container_of(fi, struct f_phonet_opts, func_inst); 679 680 fp->dev = opts->net; 681 fp->function.name = "phonet"; 682 fp->function.bind = pn_bind; 683 fp->function.unbind = pn_unbind; 684 fp->function.set_alt = pn_set_alt; 685 fp->function.get_alt = pn_get_alt; 686 fp->function.disable = pn_disconnect; 687 fp->function.free_func = phonet_free; 688 spin_lock_init(&fp->rx.lock); 689 690 return &fp->function; 691 } 692 693 struct net_device *gphonet_setup_default(void) 694 { 695 struct net_device *dev; 696 struct phonet_port *port; 697 698 /* Create net device */ 699 dev = alloc_netdev(sizeof(*port), "upnlink%d", NET_NAME_UNKNOWN, 700 pn_net_setup); 701 if (!dev) 702 return ERR_PTR(-ENOMEM); 703 704 port = netdev_priv(dev); 705 spin_lock_init(&port->lock); 706 netif_carrier_off(dev); 707 708 return dev; 709 } 710 711 void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g) 712 { 713 SET_NETDEV_DEV(net, &g->dev); 714 } 715 716 int gphonet_register_netdev(struct net_device *net) 717 { 718 int status; 719 720 status = register_netdev(net); 721 if (status) 722 free_netdev(net); 723 724 return status; 725 } 726 727 void gphonet_cleanup(struct net_device *dev) 728 { 729 unregister_netdev(dev); 730 } 731 732 DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc); 733 MODULE_AUTHOR("Rémi Denis-Courmont"); 734 MODULE_LICENSE("GPL"); 735