drivers/net/usb/ipheth.c

   1 /*
   2  * ipheth.c - Apple iPhone USB Ethernet driver
   3  *
   4  * Copyright (c) 2009 Diego Giagio <[email protected]>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of GIAGIO.COM nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * Alternatively, provided that this notice is retained in full, this
  20  * software may be distributed under the terms of the GNU General
  21  * Public License ("GPL") version 2, in which case the provisions of the
  22  * GPL apply INSTEAD OF those given above.
  23  *
  24  * The provided data structures and external interfaces from this code
  25  * are not restricted to be used by modules with a GPL compatible license.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  30  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  31  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  32  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  33  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  34  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  35  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  37  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  38  * DAMAGE.
  39  *
  40  *
  41  * Attention: iPhone device must be paired, otherwise it won't respond to our
  42  * driver. For more info: http://giagio.com/wiki/moin.cgi/iPhoneEthernetDriver
  43  *
  44  */
  45
  46 #include <linux/kernel.h>
  47 #include <linux/errno.h>
  48 #include <linux/slab.h>
  49 #include <linux/module.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/etherdevice.h>
  52 #include <linux/ethtool.h>
  53 #include <linux/usb.h>
  54 #include <linux/workqueue.h>
  55
  56 #define USB_VENDOR_APPLE        0x05ac
  57 #define USB_PRODUCT_IPHONE      0x1290
  58 #define USB_PRODUCT_IPHONE_3G   0x1292
  59 #define USB_PRODUCT_IPHONE_3GS  0x1294
  60 #define USB_PRODUCT_IPHONE_4    0x1297
  61 #define USB_PRODUCT_IPAD 0x129a
  62 #define USB_PRODUCT_IPAD_2      0x12a2
  63 #define USB_PRODUCT_IPAD_3      0x12a6
  64 #define USB_PRODUCT_IPAD_MINI    0x12ab
  65 #define USB_PRODUCT_IPHONE_4_VZW 0x129c
  66 #define USB_PRODUCT_IPHONE_4S   0x12a0
  67 #define USB_PRODUCT_IPHONE_5    0x12a8
  68
  69 #define IPHETH_USBINTF_CLASS    255
  70 #define IPHETH_USBINTF_SUBCLASS 253
  71 #define IPHETH_USBINTF_PROTO    1
  72
  73 #define IPHETH_BUF_SIZE         1516
  74 #define IPHETH_IP_ALIGN         2       /* padding at front of URB */
  75 #define IPHETH_TX_TIMEOUT       (5 * HZ)
  76
  77 #define IPHETH_INTFNUM          2
  78 #define IPHETH_ALT_INTFNUM      1
  79
  80 #define IPHETH_CTRL_ENDP        0x00
  81 #define IPHETH_CTRL_BUF_SIZE    0x40
  82 #define IPHETH_CTRL_TIMEOUT     (5 * HZ)
  83
  84 #define IPHETH_CMD_GET_MACADDR   0x00
  85 #define IPHETH_CMD_CARRIER_CHECK 0x45
  86
  87 #define IPHETH_CARRIER_CHECK_TIMEOUT round_jiffies_relative(1 * HZ)
  88 #define IPHETH_CARRIER_ON       0x04
  89
  90 static struct usb_device_id ipheth_table[] = {
  91         { USB_DEVICE_AND_INTERFACE_INFO(
  92                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE,
  93                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
  94                 IPHETH_USBINTF_PROTO) },
  95         { USB_DEVICE_AND_INTERFACE_INFO(
  96                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3G,
  97                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
  98                 IPHETH_USBINTF_PROTO) },
  99         { USB_DEVICE_AND_INTERFACE_INFO(
 100                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3GS,
 101                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 102                 IPHETH_USBINTF_PROTO) },
 103         { USB_DEVICE_AND_INTERFACE_INFO(
 104                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4,
 105                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 106                 IPHETH_USBINTF_PROTO) },
 107         { USB_DEVICE_AND_INTERFACE_INFO(
 108                 USB_VENDOR_APPLE, USB_PRODUCT_IPAD,
 109                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 110                 IPHETH_USBINTF_PROTO) },
 111         { USB_DEVICE_AND_INTERFACE_INFO(
 112                 USB_VENDOR_APPLE, USB_PRODUCT_IPAD_2,
 113                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 114                 IPHETH_USBINTF_PROTO) },
 115         { USB_DEVICE_AND_INTERFACE_INFO(
 116                 USB_VENDOR_APPLE, USB_PRODUCT_IPAD_3,
 117                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 118                 IPHETH_USBINTF_PROTO) },
 119         { USB_DEVICE_AND_INTERFACE_INFO(
 120                 USB_VENDOR_APPLE, USB_PRODUCT_IPAD_MINI,
 121                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 122                 IPHETH_USBINTF_PROTO) },
 123         { USB_DEVICE_AND_INTERFACE_INFO(
 124                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4_VZW,
 125                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 126                 IPHETH_USBINTF_PROTO) },
 127         { USB_DEVICE_AND_INTERFACE_INFO(
 128                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4S,
 129                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 130                 IPHETH_USBINTF_PROTO) },
 131         { USB_DEVICE_AND_INTERFACE_INFO(
 132                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_5,
 133                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 134                 IPHETH_USBINTF_PROTO) },
 135         { }
 136 };
 137 MODULE_DEVICE_TABLE(usb, ipheth_table);
 138
 139 struct ipheth_device {
 140         struct usb_device *udev;
 141         struct usb_interface *intf;
 142         struct net_device *net;
 143         struct sk_buff *tx_skb;
 144         struct urb *tx_urb;
 145         struct urb *rx_urb;
 146         unsigned char *tx_buf;
 147         unsigned char *rx_buf;
 148         unsigned char *ctrl_buf;
 149         u8 bulk_in;
 150         u8 bulk_out;
 151         struct delayed_work carrier_work;
 152 };
 153
 154 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags);
 155
 156 static int ipheth_alloc_urbs(struct ipheth_device *iphone)
 157 {
 158         struct urb *tx_urb = NULL;
 159         struct urb *rx_urb = NULL;
 160         u8 *tx_buf = NULL;
 161         u8 *rx_buf = NULL;
 162
 163         tx_urb = usb_alloc_urb(0, GFP_KERNEL);
 164         if (tx_urb == NULL)
 165                 goto error_nomem;
 166
 167         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
 168         if (rx_urb == NULL)
 169                 goto free_tx_urb;
 170
 171         tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
 172                                     GFP_KERNEL, &tx_urb->transfer_dma);
 173         if (tx_buf == NULL)
 174                 goto free_rx_urb;
 175
 176         rx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
 177                                     GFP_KERNEL, &rx_urb->transfer_dma);
 178         if (rx_buf == NULL)
 179                 goto free_tx_buf;
 180
 181
 182         iphone->tx_urb = tx_urb;
 183         iphone->rx_urb = rx_urb;
 184         iphone->tx_buf = tx_buf;
 185         iphone->rx_buf = rx_buf;
 186         return 0;
 187
 188 free_tx_buf:
 189         usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, tx_buf,
 190                           tx_urb->transfer_dma);
 191 free_rx_urb:
 192         usb_free_urb(rx_urb);
 193 free_tx_urb:
 194         usb_free_urb(tx_urb);
 195 error_nomem:
 196         return -ENOMEM;
 197 }
 198
 199 static void ipheth_free_urbs(struct ipheth_device *iphone)
 200 {
 201         usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->rx_buf,
 202                           iphone->rx_urb->transfer_dma);
 203         usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->tx_buf,
 204                           iphone->tx_urb->transfer_dma);
 205         usb_free_urb(iphone->rx_urb);
 206         usb_free_urb(iphone->tx_urb);
 207 }
 208
 209 static void ipheth_kill_urbs(struct ipheth_device *dev)
 210 {
 211         usb_kill_urb(dev->tx_urb);
 212         usb_kill_urb(dev->rx_urb);
 213 }
 214
 215 static void ipheth_rcvbulk_callback(struct urb *urb)
 216 {
 217         struct ipheth_device *dev;
 218         struct sk_buff *skb;
 219         int status;
 220         char *buf;
 221         int len;
 222
 223         dev = urb->context;
 224         if (dev == NULL)
 225                 return;
 226
 227         status = urb->status;
 228         switch (status) {
 229         case -ENOENT:
 230         case -ECONNRESET:
 231         case -ESHUTDOWN:
 232                 return;
 233         case 0:
 234                 break;
 235         default:
 236                 dev_err(&dev->intf->dev, "%s: urb status: %d\n",
 237                         __func__, status);
 238                 return;
 239         }
 240
 241         if (urb->actual_length <= IPHETH_IP_ALIGN) {
 242                 dev->net->stats.rx_length_errors++;
 243                 return;
 244         }
 245         len = urb->actual_length - IPHETH_IP_ALIGN;
 246         buf = urb->transfer_buffer + IPHETH_IP_ALIGN;
 247
 248         skb = dev_alloc_skb(len);
 249         if (!skb) {
 250                 dev_err(&dev->intf->dev, "%s: dev_alloc_skb: -ENOMEM\n",
 251                         __func__);
 252                 dev->net->stats.rx_dropped++;
 253                 return;
 254         }
 255
 256         memcpy(skb_put(skb, len), buf, len);
 257         skb->dev = dev->net;
 258         skb->protocol = eth_type_trans(skb, dev->net);
 259
 260         dev->net->stats.rx_packets++;
 261         dev->net->stats.rx_bytes += len;
 262
 263         netif_rx(skb);
 264         ipheth_rx_submit(dev, GFP_ATOMIC);
 265 }
 266
 267 static void ipheth_sndbulk_callback(struct urb *urb)
 268 {
 269         struct ipheth_device *dev;
 270         int status = urb->status;
 271
 272         dev = urb->context;
 273         if (dev == NULL)
 274                 return;
 275
 276         if (status != 0 &&
 277             status != -ENOENT &&
 278             status != -ECONNRESET &&
 279             status != -ESHUTDOWN)
 280                 dev_err(&dev->intf->dev, "%s: urb status: %d\n",
 281                 __func__, status);
 282
 283         dev_kfree_skb_irq(dev->tx_skb);
 284         netif_wake_queue(dev->net);
 285 }
 286
 287 static int ipheth_carrier_set(struct ipheth_device *dev)
 288 {
 289         struct usb_device *udev = dev->udev;
 290         int retval;
 291
 292         retval = usb_control_msg(udev,
 293                         usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
 294                         IPHETH_CMD_CARRIER_CHECK, /* request */
 295                         0xc0, /* request type */
 296                         0x00, /* value */
 297                         0x02, /* index */
 298                         dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE,
 299                         IPHETH_CTRL_TIMEOUT);
 300         if (retval < 0) {
 301                 dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
 302                         __func__, retval);
 303                 return retval;
 304         }
 305
 306         if (dev->ctrl_buf[0] == IPHETH_CARRIER_ON)
 307                 netif_carrier_on(dev->net);
 308         else
 309                 netif_carrier_off(dev->net);
 310
 311         return 0;
 312 }
 313
 314 static void ipheth_carrier_check_work(struct work_struct *work)
 315 {
 316         struct ipheth_device *dev = container_of(work, struct ipheth_device,
 317                                                  carrier_work.work);
 318
 319         ipheth_carrier_set(dev);
 320         schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
 321 }
 322
 323 static int ipheth_get_macaddr(struct ipheth_device *dev)
 324 {
 325         struct usb_device *udev = dev->udev;
 326         struct net_device *net = dev->net;
 327         int retval;
 328
 329         retval = usb_control_msg(udev,
 330                                  usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
 331                                  IPHETH_CMD_GET_MACADDR, /* request */
 332                                  0xc0, /* request type */
 333                                  0x00, /* value */
 334                                  0x02, /* index */
 335                                  dev->ctrl_buf,
 336                                  IPHETH_CTRL_BUF_SIZE,
 337                                  IPHETH_CTRL_TIMEOUT);
 338         if (retval < 0) {
 339                 dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
 340                         __func__, retval);
 341         } else if (retval < ETH_ALEN) {
 342                 dev_err(&dev->intf->dev,
 343                         "%s: usb_control_msg: short packet: %d bytes\n",
 344                         __func__, retval);
 345                 retval = -EINVAL;
 346         } else {
 347                 memcpy(net->dev_addr, dev->ctrl_buf, ETH_ALEN);
 348                 retval = 0;
 349         }
 350
 351         return retval;
 352 }
 353
 354 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags)
 355 {
 356         struct usb_device *udev = dev->udev;
 357         int retval;
 358
 359         usb_fill_bulk_urb(dev->rx_urb, udev,
 360                           usb_rcvbulkpipe(udev, dev->bulk_in),
 361                           dev->rx_buf, IPHETH_BUF_SIZE,
 362                           ipheth_rcvbulk_callback,
 363                           dev);
 364         dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 365
 366         retval = usb_submit_urb(dev->rx_urb, mem_flags);
 367         if (retval)
 368                 dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
 369                         __func__, retval);
 370         return retval;
 371 }
 372
 373 static int ipheth_open(struct net_device *net)
 374 {
 375         struct ipheth_device *dev = netdev_priv(net);
 376         struct usb_device *udev = dev->udev;
 377         int retval = 0;
 378
 379         usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM);
 380
 381         retval = ipheth_carrier_set(dev);
 382         if (retval)
 383                 return retval;
 384
 385         retval = ipheth_rx_submit(dev, GFP_KERNEL);
 386         if (retval)
 387                 return retval;
 388
 389         schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
 390         netif_start_queue(net);
 391         return retval;
 392 }
 393
 394 static int ipheth_close(struct net_device *net)
 395 {
 396         struct ipheth_device *dev = netdev_priv(net);
 397
 398         cancel_delayed_work_sync(&dev->carrier_work);
 399         netif_stop_queue(net);
 400         return 0;
 401 }
 402
 403 static int ipheth_tx(struct sk_buff *skb, struct net_device *net)
 404 {
 405         struct ipheth_device *dev = netdev_priv(net);
 406         struct usb_device *udev = dev->udev;
 407         int retval;
 408
 409         /* Paranoid */
 410         if (skb->len > IPHETH_BUF_SIZE) {
 411                 WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len);
 412                 dev->net->stats.tx_dropped++;
 413                 dev_kfree_skb_irq(skb);
 414                 return NETDEV_TX_OK;
 415         }
 416
 417         memcpy(dev->tx_buf, skb->data, skb->len);
 418         if (skb->len < IPHETH_BUF_SIZE)
 419                 memset(dev->tx_buf + skb->len, 0, IPHETH_BUF_SIZE - skb->len);
 420
 421         usb_fill_bulk_urb(dev->tx_urb, udev,
 422                           usb_sndbulkpipe(udev, dev->bulk_out),
 423                           dev->tx_buf, IPHETH_BUF_SIZE,
 424                           ipheth_sndbulk_callback,
 425                           dev);
 426         dev->tx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 427
 428         retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC);
 429         if (retval) {
 430                 dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
 431                         __func__, retval);
 432                 dev->net->stats.tx_errors++;
 433                 dev_kfree_skb_irq(skb);
 434         } else {
 435                 dev->tx_skb = skb;
 436
 437                 dev->net->stats.tx_packets++;
 438                 dev->net->stats.tx_bytes += skb->len;
 439                 netif_stop_queue(net);
 440         }
 441
 442         return NETDEV_TX_OK;
 443 }
 444
 445 static void ipheth_tx_timeout(struct net_device *net)
 446 {
 447         struct ipheth_device *dev = netdev_priv(net);
 448
 449         dev_err(&dev->intf->dev, "%s: TX timeout\n", __func__);
 450         dev->net->stats.tx_errors++;
 451         usb_unlink_urb(dev->tx_urb);
 452 }
 453
 454 static u32 ipheth_ethtool_op_get_link(struct net_device *net)
 455 {
 456         struct ipheth_device *dev = netdev_priv(net);
 457         return netif_carrier_ok(dev->net);
 458 }
 459
 460 static const struct ethtool_ops ops = {
 461         .get_link = ipheth_ethtool_op_get_link
 462 };
 463
 464 static const struct net_device_ops ipheth_netdev_ops = {
 465         .ndo_open = ipheth_open,
 466         .ndo_stop = ipheth_close,
 467         .ndo_start_xmit = ipheth_tx,
 468         .ndo_tx_timeout = ipheth_tx_timeout,
 469 };
 470
 471 static int ipheth_probe(struct usb_interface *intf,
 472                         const struct usb_device_id *id)
 473 {
 474         struct usb_device *udev = interface_to_usbdev(intf);
 475         struct usb_host_interface *hintf;
 476         struct usb_endpoint_descriptor *endp;
 477         struct ipheth_device *dev;
 478         struct net_device *netdev;
 479         int i;
 480         int retval;
 481
 482         netdev = alloc_etherdev(sizeof(struct ipheth_device));
 483         if (!netdev)
 484                 return -ENOMEM;
 485
 486         netdev->netdev_ops = &ipheth_netdev_ops;
 487         netdev->watchdog_timeo = IPHETH_TX_TIMEOUT;
 488         strcpy(netdev->name, "eth%d");
 489
 490         dev = netdev_priv(netdev);
 491         dev->udev = udev;
 492         dev->net = netdev;
 493         dev->intf = intf;
 494
 495         /* Set up endpoints */
 496         hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM);
 497         if (hintf == NULL) {
 498                 retval = -ENODEV;
 499                 dev_err(&intf->dev, "Unable to find alternate settings interface\n");
 500                 goto err_endpoints;
 501         }
 502
 503         for (i = 0; i < hintf->desc.bNumEndpoints; i++) {
 504                 endp = &hintf->endpoint[i].desc;
 505                 if (usb_endpoint_is_bulk_in(endp))
 506                         dev->bulk_in = endp->bEndpointAddress;
 507                 else if (usb_endpoint_is_bulk_out(endp))
 508                         dev->bulk_out = endp->bEndpointAddress;
 509         }
 510         if (!(dev->bulk_in && dev->bulk_out)) {
 511                 retval = -ENODEV;
 512                 dev_err(&intf->dev, "Unable to find endpoints\n");
 513                 goto err_endpoints;
 514         }
 515
 516         dev->ctrl_buf = kmalloc(IPHETH_CTRL_BUF_SIZE, GFP_KERNEL);
 517         if (dev->ctrl_buf == NULL) {
 518                 retval = -ENOMEM;
 519                 goto err_alloc_ctrl_buf;
 520         }
 521
 522         retval = ipheth_get_macaddr(dev);
 523         if (retval)
 524                 goto err_get_macaddr;
 525
 526         INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work);
 527
 528         retval = ipheth_alloc_urbs(dev);
 529         if (retval) {
 530                 dev_err(&intf->dev, "error allocating urbs: %d\n", retval);
 531                 goto err_alloc_urbs;
 532         }
 533
 534         usb_set_intfdata(intf, dev);
 535
 536         SET_NETDEV_DEV(netdev, &intf->dev);
 537         netdev->ethtool_ops = &ops;
 538
 539         retval = register_netdev(netdev);
 540         if (retval) {
 541                 dev_err(&intf->dev, "error registering netdev: %d\n", retval);
 542                 retval = -EIO;
 543                 goto err_register_netdev;
 544         }
 545
 546         dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n");
 547         return 0;
 548
 549 err_register_netdev:
 550         ipheth_free_urbs(dev);
 551 err_alloc_urbs:
 552 err_get_macaddr:
 553 err_alloc_ctrl_buf:
 554         kfree(dev->ctrl_buf);
 555 err_endpoints:
 556         free_netdev(netdev);
 557         return retval;
 558 }
 559
 560 static void ipheth_disconnect(struct usb_interface *intf)
 561 {
 562         struct ipheth_device *dev;
 563
 564         dev = usb_get_intfdata(intf);
 565         if (dev != NULL) {
 566                 unregister_netdev(dev->net);
 567                 ipheth_kill_urbs(dev);
 568                 ipheth_free_urbs(dev);
 569                 kfree(dev->ctrl_buf);
 570                 free_netdev(dev->net);
 571         }
 572         usb_set_intfdata(intf, NULL);
 573         dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n");
 574 }
 575
 576 static struct usb_driver ipheth_driver = {
 577         .name =         "ipheth",
 578         .probe =        ipheth_probe,
 579         .disconnect =   ipheth_disconnect,
 580         .id_table =     ipheth_table,
 581         .disable_hub_initiated_lpm = 1,
 582 };
 583
 584 module_usb_driver(ipheth_driver);
 585
 586 MODULE_AUTHOR("Diego Giagio <[email protected]>");
 587 MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
 588 MODULE_LICENSE("Dual BSD/GPL");