/*
 * ipheth.c - Apple iPhone USB Ethernet driver
 *
 * Copyright (c) 2009 Diego Giagio <diego@giagio.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of GIAGIO.COM nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Alternatively, provided that this notice is retained in full, this
 * software may be distributed under the terms of the GNU General
 * Public License ("GPL") version 2, in which case the provisions of the
 * GPL apply INSTEAD OF those given above.
 *
 * The provided data structures and external interfaces from this code
 * are not restricted to be used by modules with a GPL compatible license.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 *
 * Attention: iPhone device must be paired, otherwise it won't respond to our
 * driver. For more info: http://giagio.com/wiki/moin.cgi/iPhoneEthernetDriver
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/usb.h>
#include <linux/workqueue.h>
#include <linux/usb/cdc.h>

#define USB_VENDOR_APPLE        0x05ac

#define IPHETH_USBINTF_CLASS    255
#define IPHETH_USBINTF_SUBCLASS 253
#define IPHETH_USBINTF_PROTO    1

#define IPHETH_IP_ALIGN         2       /* padding at front of URB */
/* On iOS devices, NCM headers in RX have a fixed size regardless of DPE count:
 * - NTH16 (NCMH): 12 bytes, as per CDC NCM 1.0 spec
 * - NDP16 (NCM0): 96 bytes, of which
 *    - NDP16 fixed header: 8 bytes
 *    - maximum of 22 DPEs (21 datagrams + trailer), 4 bytes each
 */
#define IPHETH_NDP16_MAX_DPE    22
#define IPHETH_NDP16_HEADER_SIZE (sizeof(struct usb_cdc_ncm_ndp16) + \
                                  IPHETH_NDP16_MAX_DPE * \
                                  sizeof(struct usb_cdc_ncm_dpe16))
#define IPHETH_NCM_HEADER_SIZE  (sizeof(struct usb_cdc_ncm_nth16) + \
                                 IPHETH_NDP16_HEADER_SIZE)
#define IPHETH_TX_BUF_SIZE      ETH_FRAME_LEN
#define IPHETH_RX_BUF_SIZE_LEGACY (IPHETH_IP_ALIGN + ETH_FRAME_LEN)
#define IPHETH_RX_BUF_SIZE_NCM  65536

#define IPHETH_TX_TIMEOUT       (5 * HZ)

#define IPHETH_INTFNUM          2
#define IPHETH_ALT_INTFNUM      1

#define IPHETH_CTRL_ENDP        0x00
#define IPHETH_CTRL_BUF_SIZE    0x40
#define IPHETH_CTRL_TIMEOUT     (5 * HZ)

#define IPHETH_CMD_GET_MACADDR   0x00
#define IPHETH_CMD_ENABLE_NCM    0x04
#define IPHETH_CMD_CARRIER_CHECK 0x45

#define IPHETH_CARRIER_CHECK_TIMEOUT round_jiffies_relative(1 * HZ)
#define IPHETH_CARRIER_ON       0x04

static const struct usb_device_id ipheth_table[] = {
        { USB_VENDOR_AND_INTERFACE_INFO(USB_VENDOR_APPLE, IPHETH_USBINTF_CLASS,
                                        IPHETH_USBINTF_SUBCLASS,
                                        IPHETH_USBINTF_PROTO) },
        { }
};
MODULE_DEVICE_TABLE(usb, ipheth_table);

struct ipheth_device {
        struct usb_device *udev;
        struct usb_interface *intf;
        struct net_device *net;
        struct urb *tx_urb;
        struct urb *rx_urb;
        unsigned char *tx_buf;
        unsigned char *rx_buf;
        unsigned char *ctrl_buf;
        u8 bulk_in;
        u8 bulk_out;
        struct delayed_work carrier_work;
        bool confirmed_pairing;
        int (*rcvbulk_callback)(struct urb *urb);
        size_t rx_buf_len;
};

static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags);

static int ipheth_alloc_urbs(struct ipheth_device *iphone)
{
        struct urb *tx_urb = NULL;
        struct urb *rx_urb = NULL;
        u8 *tx_buf = NULL;
        u8 *rx_buf = NULL;

        tx_urb = usb_alloc_urb(0, GFP_KERNEL);
        if (tx_urb == NULL)
                goto error_nomem;

        rx_urb = usb_alloc_urb(0, GFP_KERNEL);
        if (rx_urb == NULL)
                goto free_tx_urb;

        tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_TX_BUF_SIZE,
                                    GFP_KERNEL, &tx_urb->transfer_dma);
        if (tx_buf == NULL)
                goto free_rx_urb;

        rx_buf = usb_alloc_coherent(iphone->udev, iphone->rx_buf_len,
                                    GFP_KERNEL, &rx_urb->transfer_dma);
        if (rx_buf == NULL)
                goto free_tx_buf;


        iphone->tx_urb = tx_urb;
        iphone->rx_urb = rx_urb;
        iphone->tx_buf = tx_buf;
        iphone->rx_buf = rx_buf;
        return 0;

free_tx_buf:
        usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, tx_buf,
                          tx_urb->transfer_dma);
free_rx_urb:
        usb_free_urb(rx_urb);
free_tx_urb:
        usb_free_urb(tx_urb);
error_nomem:
        return -ENOMEM;
}

static void ipheth_free_urbs(struct ipheth_device *iphone)
{
        usb_free_coherent(iphone->udev, iphone->rx_buf_len, iphone->rx_buf,
                          iphone->rx_urb->transfer_dma);
        usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, iphone->tx_buf,
                          iphone->tx_urb->transfer_dma);
        usb_free_urb(iphone->rx_urb);
        usb_free_urb(iphone->tx_urb);
}

static void ipheth_kill_urbs(struct ipheth_device *dev)
{
        usb_kill_urb(dev->tx_urb);
        usb_kill_urb(dev->rx_urb);
}

static int ipheth_consume_skb(char *buf, int len, struct ipheth_device *dev)
{
        struct sk_buff *skb;

        skb = dev_alloc_skb(len);
        if (!skb) {
                dev->net->stats.rx_dropped++;
                return -ENOMEM;
        }

        skb_put_data(skb, buf, len);
        skb->dev = dev->net;
        skb->protocol = eth_type_trans(skb, dev->net);

        dev->net->stats.rx_packets++;
        dev->net->stats.rx_bytes += len;
        netif_rx(skb);

        return 0;
}

static int ipheth_rcvbulk_callback_legacy(struct urb *urb)
{
        struct ipheth_device *dev;
        char *buf;
        int len;

        dev = urb->context;

        if (urb->actual_length <= IPHETH_IP_ALIGN) {
                dev->net->stats.rx_length_errors++;
                return -EINVAL;
        }
        len = urb->actual_length - IPHETH_IP_ALIGN;
        buf = urb->transfer_buffer + IPHETH_IP_ALIGN;

        return ipheth_consume_skb(buf, len, dev);
}

/* In "NCM mode", the iOS device encapsulates RX (phone->computer) traffic
 * in NCM Transfer Blocks (similarly to CDC NCM). However, unlike reverse
 * tethering (handled by the `cdc_ncm` driver), regular tethering is not
 * compliant with the CDC NCM spec, as the device is missing the necessary
 * descriptors, and TX (computer->phone) traffic is not encapsulated
 * at all. Thus `ipheth` implements a very limited subset of the spec with
 * the sole purpose of parsing RX URBs.
 */
static int ipheth_rcvbulk_callback_ncm(struct urb *urb)
{
        struct usb_cdc_ncm_nth16 *ncmh;
        struct usb_cdc_ncm_ndp16 *ncm0;
        struct usb_cdc_ncm_dpe16 *dpe;
        struct ipheth_device *dev;
        u16 dg_idx, dg_len;
        int retval = -EINVAL;
        char *buf;

        dev = urb->context;

        if (urb->actual_length < IPHETH_NCM_HEADER_SIZE) {
                dev->net->stats.rx_length_errors++;
                return retval;
        }

        ncmh = urb->transfer_buffer;
        if (ncmh->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN) ||
            /* On iOS, NDP16 directly follows NTH16 */
            ncmh->wNdpIndex != cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16)))
                goto rx_error;

        ncm0 = urb->transfer_buffer + sizeof(struct usb_cdc_ncm_nth16);
        if (ncm0->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN))
                goto rx_error;

        dpe = ncm0->dpe16;
        for (int dpe_i = 0; dpe_i < IPHETH_NDP16_MAX_DPE; ++dpe_i, ++dpe) {
                dg_idx = le16_to_cpu(dpe->wDatagramIndex);
                dg_len = le16_to_cpu(dpe->wDatagramLength);

                /* Null DPE must be present after last datagram pointer entry
                 * (3.3.1 USB CDC NCM spec v1.0)
                 */
                if (dg_idx == 0 && dg_len == 0)
                        return 0;

                if (dg_idx < IPHETH_NCM_HEADER_SIZE ||
                    dg_idx >= urb->actual_length ||
                    dg_len > urb->actual_length - dg_idx) {
                        dev->net->stats.rx_length_errors++;
                        return retval;
                }

                buf = urb->transfer_buffer + dg_idx;

                retval = ipheth_consume_skb(buf, dg_len, dev);
                if (retval != 0)
                        return retval;
        }

rx_error:
        dev->net->stats.rx_errors++;
        return retval;
}

static void ipheth_rcvbulk_callback(struct urb *urb)
{
        struct ipheth_device *dev;
        int retval, status;

        dev = urb->context;
        if (dev == NULL)
                return;

        status = urb->status;
        switch (status) {
        case -ENOENT:
        case -ECONNRESET:
        case -ESHUTDOWN:
        case -EPROTO:
                return;
        case 0:
                break;
        default:
                dev_err(&dev->intf->dev, "%s: urb status: %d\n",
                        __func__, status);
                return;
        }

        /* iPhone may periodically send URBs with no payload
         * on the "bulk in" endpoint. It is safe to ignore them.
         */
        if (urb->actual_length == 0)
                goto rx_submit;

        /* RX URBs starting with 0x00 0x01 do not encapsulate Ethernet frames,
         * but rather are control frames. Their purpose is not documented, and
         * they don't affect driver functionality, okay to drop them.
         * There is usually just one 4-byte control frame as the very first
         * URB received from the bulk IN endpoint.
         */
        if (unlikely
                (urb->actual_length == 4 &&
                 ((char *)urb->transfer_buffer)[0] == 0 &&
                 ((char *)urb->transfer_buffer)[1] == 1))
                goto rx_submit;

        retval = dev->rcvbulk_callback(urb);
        if (retval != 0) {
                dev_err(&dev->intf->dev, "%s: callback retval: %d\n",
                        __func__, retval);
        }

rx_submit:
        dev->confirmed_pairing = true;
        ipheth_rx_submit(dev, GFP_ATOMIC);
}

static void ipheth_sndbulk_callback(struct urb *urb)
{
        struct ipheth_device *dev;
        int status = urb->status;

        dev = urb->context;
        if (dev == NULL)
                return;

        if (status != 0 &&
            status != -ENOENT &&
            status != -ECONNRESET &&
            status != -ESHUTDOWN)
                dev_err(&dev->intf->dev, "%s: urb status: %d\n",
                __func__, status);

        if (status == 0)
                netif_wake_queue(dev->net);
        else
                // on URB error, trigger immediate poll
                schedule_delayed_work(&dev->carrier_work, 0);
}

static int ipheth_carrier_set(struct ipheth_device *dev)
{
        struct usb_device *udev;
        int retval;

        if (!dev->confirmed_pairing)
                return 0;

        udev = dev->udev;
        retval = usb_control_msg(udev,
                        usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
                        IPHETH_CMD_CARRIER_CHECK, /* request */
                        0xc0, /* request type */
                        0x00, /* value */
                        0x02, /* index */
                        dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE,
                        IPHETH_CTRL_TIMEOUT);
        if (retval <= 0) {
                dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
                        __func__, retval);
                return retval;
        }

        if ((retval == 1 && dev->ctrl_buf[0] == IPHETH_CARRIER_ON) ||
            (retval >= 2 && dev->ctrl_buf[1] == IPHETH_CARRIER_ON)) {
                netif_carrier_on(dev->net);
                if (dev->tx_urb->status != -EINPROGRESS)
                        netif_wake_queue(dev->net);
        } else {
                netif_carrier_off(dev->net);
                netif_stop_queue(dev->net);
        }
        return 0;
}

static void ipheth_carrier_check_work(struct work_struct *work)
{
        struct ipheth_device *dev = container_of(work, struct ipheth_device,
                                                 carrier_work.work);

        ipheth_carrier_set(dev);
        schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
}

static int ipheth_get_macaddr(struct ipheth_device *dev)
{
        struct usb_device *udev = dev->udev;
        struct net_device *net = dev->net;
        int retval;

        retval = usb_control_msg(udev,
                                 usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
                                 IPHETH_CMD_GET_MACADDR, /* request */
                                 0xc0, /* request type */
                                 0x00, /* value */
                                 0x02, /* index */
                                 dev->ctrl_buf,
                                 IPHETH_CTRL_BUF_SIZE,
                                 IPHETH_CTRL_TIMEOUT);
        if (retval < 0) {
                dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
                        __func__, retval);
        } else if (retval < ETH_ALEN) {
                dev_err(&dev->intf->dev,
                        "%s: usb_control_msg: short packet: %d bytes\n",
                        __func__, retval);
                retval = -EINVAL;
        } else {
                eth_hw_addr_set(net, dev->ctrl_buf);
                retval = 0;
        }

        return retval;
}

static int ipheth_enable_ncm(struct ipheth_device *dev)
{
        struct usb_device *udev = dev->udev;
        int retval;

        retval = usb_control_msg(udev,
                                 usb_sndctrlpipe(udev, IPHETH_CTRL_ENDP),
                                 IPHETH_CMD_ENABLE_NCM, /* request */
                                 0x41, /* request type */
                                 0x00, /* value */
                                 0x02, /* index */
                                 NULL,
                                 0,
                                 IPHETH_CTRL_TIMEOUT);

        dev_info(&dev->intf->dev, "%s: usb_control_msg: %d\n",
                 __func__, retval);

        return retval;
}

static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags)
{
        struct usb_device *udev = dev->udev;
        int retval;

        usb_fill_bulk_urb(dev->rx_urb, udev,
                          usb_rcvbulkpipe(udev, dev->bulk_in),
                          dev->rx_buf, dev->rx_buf_len,
                          ipheth_rcvbulk_callback,
                          dev);
        dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

        retval = usb_submit_urb(dev->rx_urb, mem_flags);
        if (retval)
                dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
                        __func__, retval);
        return retval;
}

static int ipheth_open(struct net_device *net)
{
        struct ipheth_device *dev = netdev_priv(net);
        struct usb_device *udev = dev->udev;
        int retval = 0;

        usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM);

        retval = ipheth_carrier_set(dev);
        if (retval)
                return retval;

        retval = ipheth_rx_submit(dev, GFP_KERNEL);
        if (retval)
                return retval;

        schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
        return retval;
}

static int ipheth_close(struct net_device *net)
{
        struct ipheth_device *dev = netdev_priv(net);

        netif_stop_queue(net);
        cancel_delayed_work_sync(&dev->carrier_work);
        return 0;
}

static netdev_tx_t ipheth_tx(struct sk_buff *skb, struct net_device *net)
{
        struct ipheth_device *dev = netdev_priv(net);
        struct usb_device *udev = dev->udev;
        int retval;

        /* Paranoid */
        if (skb->len > IPHETH_TX_BUF_SIZE) {
                WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len);
                dev->net->stats.tx_dropped++;
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        memcpy(dev->tx_buf, skb->data, skb->len);

        usb_fill_bulk_urb(dev->tx_urb, udev,
                          usb_sndbulkpipe(udev, dev->bulk_out),
                          dev->tx_buf, skb->len,
                          ipheth_sndbulk_callback,
                          dev);
        dev->tx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

        netif_stop_queue(net);
        retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC);
        if (retval) {
                dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
                        __func__, retval);
                dev->net->stats.tx_errors++;
                dev_kfree_skb_any(skb);
                netif_wake_queue(net);
        } else {
                dev->net->stats.tx_packets++;
                dev->net->stats.tx_bytes += skb->len;
                dev_consume_skb_any(skb);
        }

        return NETDEV_TX_OK;
}

static void ipheth_tx_timeout(struct net_device *net, unsigned int txqueue)
{
        struct ipheth_device *dev = netdev_priv(net);

        dev_err(&dev->intf->dev, "%s: TX timeout\n", __func__);
        dev->net->stats.tx_errors++;
        usb_unlink_urb(dev->tx_urb);
}

static u32 ipheth_ethtool_op_get_link(struct net_device *net)
{
        struct ipheth_device *dev = netdev_priv(net);
        return netif_carrier_ok(dev->net);
}

static const struct ethtool_ops ops = {
        .get_link = ipheth_ethtool_op_get_link
};

static const struct net_device_ops ipheth_netdev_ops = {
        .ndo_open = ipheth_open,
        .ndo_stop = ipheth_close,
        .ndo_start_xmit = ipheth_tx,
        .ndo_tx_timeout = ipheth_tx_timeout,
};

static int ipheth_probe(struct usb_interface *intf,
                        const struct usb_device_id *id)
{
        struct usb_device *udev = interface_to_usbdev(intf);
        struct usb_host_interface *hintf;
        struct usb_endpoint_descriptor *endp;
        struct ipheth_device *dev;
        struct net_device *netdev;
        int i;
        int retval;

        netdev = alloc_etherdev(sizeof(struct ipheth_device));
        if (!netdev)
                return -ENOMEM;

        netdev->netdev_ops = &ipheth_netdev_ops;
        netdev->watchdog_timeo = IPHETH_TX_TIMEOUT;
        strscpy(netdev->name, "eth%d", sizeof(netdev->name));

        dev = netdev_priv(netdev);
        dev->udev = udev;
        dev->net = netdev;
        dev->intf = intf;
        dev->confirmed_pairing = false;
        dev->rx_buf_len = IPHETH_RX_BUF_SIZE_LEGACY;
        dev->rcvbulk_callback = ipheth_rcvbulk_callback_legacy;
        /* Set up endpoints */
        hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM);
        if (hintf == NULL) {
                retval = -ENODEV;
                dev_err(&intf->dev, "Unable to find alternate settings interface\n");
                goto err_endpoints;
        }

        for (i = 0; i < hintf->desc.bNumEndpoints; i++) {
                endp = &hintf->endpoint[i].desc;
                if (usb_endpoint_is_bulk_in(endp))
                        dev->bulk_in = endp->bEndpointAddress;
                else if (usb_endpoint_is_bulk_out(endp))
                        dev->bulk_out = endp->bEndpointAddress;
        }
        if (!(dev->bulk_in && dev->bulk_out)) {
                retval = -ENODEV;
                dev_err(&intf->dev, "Unable to find endpoints\n");
                goto err_endpoints;
        }

        dev->ctrl_buf = kmalloc(IPHETH_CTRL_BUF_SIZE, GFP_KERNEL);
        if (dev->ctrl_buf == NULL) {
                retval = -ENOMEM;
                goto err_alloc_ctrl_buf;
        }

        retval = ipheth_get_macaddr(dev);
        if (retval)
                goto err_get_macaddr;

        retval = ipheth_enable_ncm(dev);
        if (!retval) {
                dev->rx_buf_len = IPHETH_RX_BUF_SIZE_NCM;
                dev->rcvbulk_callback = ipheth_rcvbulk_callback_ncm;
        }

        INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work);

        retval = ipheth_alloc_urbs(dev);
        if (retval) {
                dev_err(&intf->dev, "error allocating urbs: %d\n", retval);
                goto err_alloc_urbs;
        }

        usb_set_intfdata(intf, dev);

        SET_NETDEV_DEV(netdev, &intf->dev);
        netdev->ethtool_ops = &ops;

        retval = register_netdev(netdev);
        if (retval) {
                dev_err(&intf->dev, "error registering netdev: %d\n", retval);
                retval = -EIO;
                goto err_register_netdev;
        }
        // carrier down and transmit queues stopped until packet from device
        netif_carrier_off(netdev);
        netif_tx_stop_all_queues(netdev);
        dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n");
        return 0;

err_register_netdev:
        ipheth_free_urbs(dev);
err_alloc_urbs:
err_get_macaddr:
        kfree(dev->ctrl_buf);
err_alloc_ctrl_buf:
err_endpoints:
        free_netdev(netdev);
        return retval;
}

static void ipheth_disconnect(struct usb_interface *intf)
{
        struct ipheth_device *dev;

        dev = usb_get_intfdata(intf);
        if (dev != NULL) {
                unregister_netdev(dev->net);
                ipheth_kill_urbs(dev);
                ipheth_free_urbs(dev);
                kfree(dev->ctrl_buf);
                free_netdev(dev->net);
        }
        usb_set_intfdata(intf, NULL);
        dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n");
}

static struct usb_driver ipheth_driver = {
        .name =         "ipheth",
        .probe =        ipheth_probe,
        .disconnect =   ipheth_disconnect,
        .id_table =     ipheth_table,
        .disable_hub_initiated_lpm = 1,
};

module_usb_driver(ipheth_driver);

MODULE_AUTHOR("Diego Giagio <diego@giagio.com>");
MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
MODULE_LICENSE("Dual BSD/GPL");