linux/drivers/net/usb/ipheth.c
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   1/*
   2 * ipheth.c - Apple iPhone USB Ethernet driver
   3 *
   4 * Copyright (c) 2009 Diego Giagio <diego@giagio.com>
   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
  90static const 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};
 137MODULE_DEVICE_TABLE(usb, ipheth_table);
 138
 139struct 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        bool confirmed_pairing;
 153};
 154
 155static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags);
 156
 157static int ipheth_alloc_urbs(struct ipheth_device *iphone)
 158{
 159        struct urb *tx_urb = NULL;
 160        struct urb *rx_urb = NULL;
 161        u8 *tx_buf = NULL;
 162        u8 *rx_buf = NULL;
 163
 164        tx_urb = usb_alloc_urb(0, GFP_KERNEL);
 165        if (tx_urb == NULL)
 166                goto error_nomem;
 167
 168        rx_urb = usb_alloc_urb(0, GFP_KERNEL);
 169        if (rx_urb == NULL)
 170                goto free_tx_urb;
 171
 172        tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
 173                                    GFP_KERNEL, &tx_urb->transfer_dma);
 174        if (tx_buf == NULL)
 175                goto free_rx_urb;
 176
 177        rx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
 178                                    GFP_KERNEL, &rx_urb->transfer_dma);
 179        if (rx_buf == NULL)
 180                goto free_tx_buf;
 181
 182
 183        iphone->tx_urb = tx_urb;
 184        iphone->rx_urb = rx_urb;
 185        iphone->tx_buf = tx_buf;
 186        iphone->rx_buf = rx_buf;
 187        return 0;
 188
 189free_tx_buf:
 190        usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, tx_buf,
 191                          tx_urb->transfer_dma);
 192free_rx_urb:
 193        usb_free_urb(rx_urb);
 194free_tx_urb:
 195        usb_free_urb(tx_urb);
 196error_nomem:
 197        return -ENOMEM;
 198}
 199
 200static void ipheth_free_urbs(struct ipheth_device *iphone)
 201{
 202        usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->rx_buf,
 203                          iphone->rx_urb->transfer_dma);
 204        usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->tx_buf,
 205                          iphone->tx_urb->transfer_dma);
 206        usb_free_urb(iphone->rx_urb);
 207        usb_free_urb(iphone->tx_urb);
 208}
 209
 210static void ipheth_kill_urbs(struct ipheth_device *dev)
 211{
 212        usb_kill_urb(dev->tx_urb);
 213        usb_kill_urb(dev->rx_urb);
 214}
 215
 216static void ipheth_rcvbulk_callback(struct urb *urb)
 217{
 218        struct ipheth_device *dev;
 219        struct sk_buff *skb;
 220        int status;
 221        char *buf;
 222        int len;
 223
 224        dev = urb->context;
 225        if (dev == NULL)
 226                return;
 227
 228        status = urb->status;
 229        switch (status) {
 230        case -ENOENT:
 231        case -ECONNRESET:
 232        case -ESHUTDOWN:
 233                return;
 234        case 0:
 235                break;
 236        default:
 237                dev_err(&dev->intf->dev, "%s: urb status: %d\n",
 238                        __func__, status);
 239                return;
 240        }
 241
 242        if (urb->actual_length <= IPHETH_IP_ALIGN) {
 243                dev->net->stats.rx_length_errors++;
 244                return;
 245        }
 246        len = urb->actual_length - IPHETH_IP_ALIGN;
 247        buf = urb->transfer_buffer + IPHETH_IP_ALIGN;
 248
 249        skb = dev_alloc_skb(len);
 250        if (!skb) {
 251                dev_err(&dev->intf->dev, "%s: dev_alloc_skb: -ENOMEM\n",
 252                        __func__);
 253                dev->net->stats.rx_dropped++;
 254                return;
 255        }
 256
 257        skb_put_data(skb, buf, len);
 258        skb->dev = dev->net;
 259        skb->protocol = eth_type_trans(skb, dev->net);
 260
 261        dev->net->stats.rx_packets++;
 262        dev->net->stats.rx_bytes += len;
 263        dev->confirmed_pairing = true;
 264        netif_rx(skb);
 265        ipheth_rx_submit(dev, GFP_ATOMIC);
 266}
 267
 268static void ipheth_sndbulk_callback(struct urb *urb)
 269{
 270        struct ipheth_device *dev;
 271        int status = urb->status;
 272
 273        dev = urb->context;
 274        if (dev == NULL)
 275                return;
 276
 277        if (status != 0 &&
 278            status != -ENOENT &&
 279            status != -ECONNRESET &&
 280            status != -ESHUTDOWN)
 281                dev_err(&dev->intf->dev, "%s: urb status: %d\n",
 282                __func__, status);
 283
 284        dev_kfree_skb_irq(dev->tx_skb);
 285        if (status == 0)
 286                netif_wake_queue(dev->net);
 287        else
 288                // on URB error, trigger immediate poll
 289                schedule_delayed_work(&dev->carrier_work, 0);
 290}
 291
 292static int ipheth_carrier_set(struct ipheth_device *dev)
 293{
 294        struct usb_device *udev;
 295        int retval;
 296
 297        if (!dev)
 298                return 0;
 299        if (!dev->confirmed_pairing)
 300                return 0;
 301
 302        udev = dev->udev;
 303        retval = usb_control_msg(udev,
 304                        usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
 305                        IPHETH_CMD_CARRIER_CHECK, /* request */
 306                        0xc0, /* request type */
 307                        0x00, /* value */
 308                        0x02, /* index */
 309                        dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE,
 310                        IPHETH_CTRL_TIMEOUT);
 311        if (retval < 0) {
 312                dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
 313                        __func__, retval);
 314                return retval;
 315        }
 316
 317        if (dev->ctrl_buf[0] == IPHETH_CARRIER_ON) {
 318                netif_carrier_on(dev->net);
 319                if (dev->tx_urb->status != -EINPROGRESS)
 320                        netif_wake_queue(dev->net);
 321        } else {
 322                netif_carrier_off(dev->net);
 323                netif_stop_queue(dev->net);
 324        }
 325        return 0;
 326}
 327
 328static void ipheth_carrier_check_work(struct work_struct *work)
 329{
 330        struct ipheth_device *dev = container_of(work, struct ipheth_device,
 331                                                 carrier_work.work);
 332
 333        ipheth_carrier_set(dev);
 334        schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
 335}
 336
 337static int ipheth_get_macaddr(struct ipheth_device *dev)
 338{
 339        struct usb_device *udev = dev->udev;
 340        struct net_device *net = dev->net;
 341        int retval;
 342
 343        retval = usb_control_msg(udev,
 344                                 usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
 345                                 IPHETH_CMD_GET_MACADDR, /* request */
 346                                 0xc0, /* request type */
 347                                 0x00, /* value */
 348                                 0x02, /* index */
 349                                 dev->ctrl_buf,
 350                                 IPHETH_CTRL_BUF_SIZE,
 351                                 IPHETH_CTRL_TIMEOUT);
 352        if (retval < 0) {
 353                dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
 354                        __func__, retval);
 355        } else if (retval < ETH_ALEN) {
 356                dev_err(&dev->intf->dev,
 357                        "%s: usb_control_msg: short packet: %d bytes\n",
 358                        __func__, retval);
 359                retval = -EINVAL;
 360        } else {
 361                memcpy(net->dev_addr, dev->ctrl_buf, ETH_ALEN);
 362                retval = 0;
 363        }
 364
 365        return retval;
 366}
 367
 368static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags)
 369{
 370        struct usb_device *udev = dev->udev;
 371        int retval;
 372
 373        usb_fill_bulk_urb(dev->rx_urb, udev,
 374                          usb_rcvbulkpipe(udev, dev->bulk_in),
 375                          dev->rx_buf, IPHETH_BUF_SIZE,
 376                          ipheth_rcvbulk_callback,
 377                          dev);
 378        dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 379
 380        retval = usb_submit_urb(dev->rx_urb, mem_flags);
 381        if (retval)
 382                dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
 383                        __func__, retval);
 384        return retval;
 385}
 386
 387static int ipheth_open(struct net_device *net)
 388{
 389        struct ipheth_device *dev = netdev_priv(net);
 390        struct usb_device *udev = dev->udev;
 391        int retval = 0;
 392
 393        usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM);
 394
 395        retval = ipheth_carrier_set(dev);
 396        if (retval)
 397                return retval;
 398
 399        retval = ipheth_rx_submit(dev, GFP_KERNEL);
 400        if (retval)
 401                return retval;
 402
 403        schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
 404        return retval;
 405}
 406
 407static int ipheth_close(struct net_device *net)
 408{
 409        struct ipheth_device *dev = netdev_priv(net);
 410
 411        cancel_delayed_work_sync(&dev->carrier_work);
 412        netif_stop_queue(net);
 413        return 0;
 414}
 415
 416static int ipheth_tx(struct sk_buff *skb, struct net_device *net)
 417{
 418        struct ipheth_device *dev = netdev_priv(net);
 419        struct usb_device *udev = dev->udev;
 420        int retval;
 421
 422        /* Paranoid */
 423        if (skb->len > IPHETH_BUF_SIZE) {
 424                WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len);
 425                dev->net->stats.tx_dropped++;
 426                dev_kfree_skb_irq(skb);
 427                return NETDEV_TX_OK;
 428        }
 429
 430        memcpy(dev->tx_buf, skb->data, skb->len);
 431        if (skb->len < IPHETH_BUF_SIZE)
 432                memset(dev->tx_buf + skb->len, 0, IPHETH_BUF_SIZE - skb->len);
 433
 434        usb_fill_bulk_urb(dev->tx_urb, udev,
 435                          usb_sndbulkpipe(udev, dev->bulk_out),
 436                          dev->tx_buf, IPHETH_BUF_SIZE,
 437                          ipheth_sndbulk_callback,
 438                          dev);
 439        dev->tx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 440
 441        retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC);
 442        if (retval) {
 443                dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
 444                        __func__, retval);
 445                dev->net->stats.tx_errors++;
 446                dev_kfree_skb_irq(skb);
 447        } else {
 448                dev->tx_skb = skb;
 449
 450                dev->net->stats.tx_packets++;
 451                dev->net->stats.tx_bytes += skb->len;
 452                netif_stop_queue(net);
 453        }
 454
 455        return NETDEV_TX_OK;
 456}
 457
 458static void ipheth_tx_timeout(struct net_device *net)
 459{
 460        struct ipheth_device *dev = netdev_priv(net);
 461
 462        dev_err(&dev->intf->dev, "%s: TX timeout\n", __func__);
 463        dev->net->stats.tx_errors++;
 464        usb_unlink_urb(dev->tx_urb);
 465}
 466
 467static u32 ipheth_ethtool_op_get_link(struct net_device *net)
 468{
 469        struct ipheth_device *dev = netdev_priv(net);
 470        return netif_carrier_ok(dev->net);
 471}
 472
 473static const struct ethtool_ops ops = {
 474        .get_link = ipheth_ethtool_op_get_link
 475};
 476
 477static const struct net_device_ops ipheth_netdev_ops = {
 478        .ndo_open = ipheth_open,
 479        .ndo_stop = ipheth_close,
 480        .ndo_start_xmit = ipheth_tx,
 481        .ndo_tx_timeout = ipheth_tx_timeout,
 482};
 483
 484static int ipheth_probe(struct usb_interface *intf,
 485                        const struct usb_device_id *id)
 486{
 487        struct usb_device *udev = interface_to_usbdev(intf);
 488        struct usb_host_interface *hintf;
 489        struct usb_endpoint_descriptor *endp;
 490        struct ipheth_device *dev;
 491        struct net_device *netdev;
 492        int i;
 493        int retval;
 494
 495        netdev = alloc_etherdev(sizeof(struct ipheth_device));
 496        if (!netdev)
 497                return -ENOMEM;
 498
 499        netdev->netdev_ops = &ipheth_netdev_ops;
 500        netdev->watchdog_timeo = IPHETH_TX_TIMEOUT;
 501        strcpy(netdev->name, "eth%d");
 502
 503        dev = netdev_priv(netdev);
 504        dev->udev = udev;
 505        dev->net = netdev;
 506        dev->intf = intf;
 507        dev->confirmed_pairing = false;
 508        /* Set up endpoints */
 509        hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM);
 510        if (hintf == NULL) {
 511                retval = -ENODEV;
 512                dev_err(&intf->dev, "Unable to find alternate settings interface\n");
 513                goto err_endpoints;
 514        }
 515
 516        for (i = 0; i < hintf->desc.bNumEndpoints; i++) {
 517                endp = &hintf->endpoint[i].desc;
 518                if (usb_endpoint_is_bulk_in(endp))
 519                        dev->bulk_in = endp->bEndpointAddress;
 520                else if (usb_endpoint_is_bulk_out(endp))
 521                        dev->bulk_out = endp->bEndpointAddress;
 522        }
 523        if (!(dev->bulk_in && dev->bulk_out)) {
 524                retval = -ENODEV;
 525                dev_err(&intf->dev, "Unable to find endpoints\n");
 526                goto err_endpoints;
 527        }
 528
 529        dev->ctrl_buf = kmalloc(IPHETH_CTRL_BUF_SIZE, GFP_KERNEL);
 530        if (dev->ctrl_buf == NULL) {
 531                retval = -ENOMEM;
 532                goto err_alloc_ctrl_buf;
 533        }
 534
 535        retval = ipheth_get_macaddr(dev);
 536        if (retval)
 537                goto err_get_macaddr;
 538
 539        INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work);
 540
 541        retval = ipheth_alloc_urbs(dev);
 542        if (retval) {
 543                dev_err(&intf->dev, "error allocating urbs: %d\n", retval);
 544                goto err_alloc_urbs;
 545        }
 546
 547        usb_set_intfdata(intf, dev);
 548
 549        SET_NETDEV_DEV(netdev, &intf->dev);
 550        netdev->ethtool_ops = &ops;
 551
 552        retval = register_netdev(netdev);
 553        if (retval) {
 554                dev_err(&intf->dev, "error registering netdev: %d\n", retval);
 555                retval = -EIO;
 556                goto err_register_netdev;
 557        }
 558        // carrier down and transmit queues stopped until packet from device
 559        netif_carrier_off(netdev);
 560        netif_tx_stop_all_queues(netdev);
 561        dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n");
 562        return 0;
 563
 564err_register_netdev:
 565        ipheth_free_urbs(dev);
 566err_alloc_urbs:
 567err_get_macaddr:
 568err_alloc_ctrl_buf:
 569        kfree(dev->ctrl_buf);
 570err_endpoints:
 571        free_netdev(netdev);
 572        return retval;
 573}
 574
 575static void ipheth_disconnect(struct usb_interface *intf)
 576{
 577        struct ipheth_device *dev;
 578
 579        dev = usb_get_intfdata(intf);
 580        if (dev != NULL) {
 581                unregister_netdev(dev->net);
 582                ipheth_kill_urbs(dev);
 583                ipheth_free_urbs(dev);
 584                kfree(dev->ctrl_buf);
 585                free_netdev(dev->net);
 586        }
 587        usb_set_intfdata(intf, NULL);
 588        dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n");
 589}
 590
 591static struct usb_driver ipheth_driver = {
 592        .name =         "ipheth",
 593        .probe =        ipheth_probe,
 594        .disconnect =   ipheth_disconnect,
 595        .id_table =     ipheth_table,
 596        .disable_hub_initiated_lpm = 1,
 597};
 598
 599module_usb_driver(ipheth_driver);
 600
 601MODULE_AUTHOR("Diego Giagio <diego@giagio.com>");
 602MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
 603MODULE_LICENSE("Dual BSD/GPL");
 604