[linux.git] / drivers / net / usb / ipheth.c

/*
 * ipheth.c - Apple iPhone USB Ethernet driver
 *
 * Copyright (c) 2009 Diego Giagio <[email protected]>
 * 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>

#define USB_VENDOR_APPLE        0x05ac
#define USB_PRODUCT_IPHONE      0x1290
#define USB_PRODUCT_IPHONE_3G   0x1292
#define USB_PRODUCT_IPHONE_3GS  0x1294
#define USB_PRODUCT_IPHONE_4	0x1297
#define USB_PRODUCT_IPAD 0x129a
#define USB_PRODUCT_IPAD_2	0x12a2
#define USB_PRODUCT_IPAD_3	0x12a6
#define USB_PRODUCT_IPAD_MINI    0x12ab
#define USB_PRODUCT_IPHONE_4_VZW 0x129c
#define USB_PRODUCT_IPHONE_4S	0x12a0
#define USB_PRODUCT_IPHONE_5	0x12a8

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

#define IPHETH_BUF_SIZE         1516
#define IPHETH_IP_ALIGN		2	/* padding at front of URB */
#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_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_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3G,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3GS,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPAD,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPAD_2,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPAD_3,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPAD_MINI,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4_VZW,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4S,
		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
		IPHETH_USBINTF_PROTO) },
	{ USB_DEVICE_AND_INTERFACE_INFO(
		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_5,
		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;
};

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_BUF_SIZE,
				    GFP_KERNEL, &tx_urb->transfer_dma);
	if (tx_buf == NULL)
		goto free_rx_urb;

	rx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
				    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_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, IPHETH_BUF_SIZE, iphone->rx_buf,
			  iphone->rx_urb->transfer_dma);
	usb_free_coherent(iphone->udev, IPHETH_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 void ipheth_rcvbulk_callback(struct urb *urb)
{
	struct ipheth_device *dev;
	struct sk_buff *skb;
	int status;
	char *buf;
	int len;

	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;
	}

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

	skb = dev_alloc_skb(len);
	if (!skb) {
		dev_err(&dev->intf->dev, "%s: dev_alloc_skb: -ENOMEM\n",
			__func__);
		dev->net->stats.rx_dropped++;
		return;
	}

	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;
	dev->confirmed_pairing = true;
	netif_rx(skb);
	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)
		return 0;
	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 (dev->ctrl_buf[0] == 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 {
		memcpy(net->dev_addr, dev->ctrl_buf, ETH_ALEN);
		retval = 0;
	}

	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, IPHETH_BUF_SIZE,
			  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);

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

static int 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_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);
	if (skb->len < IPHETH_BUF_SIZE)
		memset(dev->tx_buf + skb->len, 0, IPHETH_BUF_SIZE - skb->len);

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

	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);
	} else {
		dev->net->stats.tx_packets++;
		dev->net->stats.tx_bytes += skb->len;
		dev_consume_skb_any(skb);
		netif_stop_queue(net);
	}

	return NETDEV_TX_OK;
}

static void ipheth_tx_timeout(struct net_device *net)
{
	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;
	strcpy(netdev->name, "eth%d");

	dev = netdev_priv(netdev);
	dev->udev = udev;
	dev->net = netdev;
	dev->intf = intf;
	dev->confirmed_pairing = false;
	/* 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;

	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:
err_alloc_ctrl_buf:
	kfree(dev->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 <[email protected]>");
MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
MODULE_LICENSE("Dual BSD/GPL");
Commit	Line	Data
a19259c3 DG	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>
a19259c3 DG	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
f95d76ab	60	#define USB_PRODUCT_IPHONE_4 0x1297
6de0298e	61	#define USB_PRODUCT_IPAD 0x129a
22fd2a52 KE	62	#define USB_PRODUCT_IPAD_2 0x12a2
22fd2a52 KE	63	#define USB_PRODUCT_IPAD_3 0x12a6
a7599398	64	#define USB_PRODUCT_IPAD_MINI 0x12ab
02009afc	65	#define USB_PRODUCT_IPHONE_4_VZW 0x129c
72ba009b	66	#define USB_PRODUCT_IPHONE_4S 0x12a0
af1b85e4	67	#define USB_PRODUCT_IPHONE_5 0x12a8
a19259c3 DG	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
9c412942	74	#define IPHETH_IP_ALIGN 2 /* padding at front of URB */
a19259c3 DG	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
9befbe13	90	static const struct usb_device_id ipheth_table[] = {
a19259c3 DG	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) },
f95d76ab JA	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) },
6de0298e DG	107	{ USB_DEVICE_AND_INTERFACE_INFO(
	108	USB_VENDOR_APPLE, USB_PRODUCT_IPAD,
	109	IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
22fd2a52 KE	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,
6de0298e	118	IPHETH_USBINTF_PROTO) },
a7599398 AM	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) },
02009afc KS	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) },
72ba009b TG	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) },
af1b85e4 JP	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) },
a19259c3 DG	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;
a19259c3 DG	143	struct urb *tx_urb;
	144	struct urb *rx_urb;
	145	unsigned char *tx_buf;
	146	unsigned char *rx_buf;
	147	unsigned char *ctrl_buf;
	148	u8 bulk_in;
	149	u8 bulk_out;
	150	struct delayed_work carrier_work;
bb1b40c7	151	bool confirmed_pairing;
a19259c3 DG	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)
d87ff58f	165	goto error_nomem;
a19259c3 DG	166
	167	rx_urb = usb_alloc_urb(0, GFP_KERNEL);
	168	if (rx_urb == NULL)
d87ff58f	169	goto free_tx_urb;
a19259c3	170
997ea58e DM	171	tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
997ea58e DM	172	GFP_KERNEL, &tx_urb->transfer_dma);
a19259c3	173	if (tx_buf == NULL)
d87ff58f	174	goto free_rx_urb;
a19259c3	175
997ea58e DM	176	rx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
997ea58e DM	177	GFP_KERNEL, &rx_urb->transfer_dma);
a19259c3	178	if (rx_buf == NULL)
d87ff58f	179	goto free_tx_buf;
a19259c3 DG	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
d87ff58f	188	free_tx_buf:
997ea58e DM	189	usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, tx_buf,
997ea58e DM	190	tx_urb->transfer_dma);
d87ff58f	191	free_rx_urb:
a19259c3	192	usb_free_urb(rx_urb);
d87ff58f	193	free_tx_urb:
a19259c3	194	usb_free_urb(tx_urb);
d87ff58f	195	error_nomem:
a19259c3 DG	196	return -ENOMEM;
	197	}
	198
	199	static void ipheth_free_urbs(struct ipheth_device *iphone)
	200	{
997ea58e DM	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);
a19259c3 DG	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:
45611c61	232	case -EPROTO:
a19259c3 DG	233	return;
	234	case 0:
	235	break;
	236	default:
495f71e2 GKH	237	dev_err(&dev->intf->dev, "%s: urb status: %d\n",
495f71e2 GKH	238	__func__, status);
a19259c3 DG	239	return;
	240	}
	241
9c412942 BH	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;
a19259c3	248
9c412942	249	skb = dev_alloc_skb(len);
a19259c3	250	if (!skb) {
495f71e2 GKH	251	dev_err(&dev->intf->dev, "%s: dev_alloc_skb: -ENOMEM\n",
495f71e2 GKH	252	__func__);
a19259c3 DG	253	dev->net->stats.rx_dropped++;
	254	return;
	255	}
	256
59ae1d12	257	skb_put_data(skb, buf, len);
a19259c3 DG	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;
bb1b40c7	263	dev->confirmed_pairing = true;
a19259c3 DG	264	netif_rx(skb);
	265	ipheth_rx_submit(dev, GFP_ATOMIC);
	266	}
	267
	268	static void ipheth_sndbulk_callback(struct urb *urb)
	269	{
	270	struct ipheth_device *dev;
c31fd6c2	271	int status = urb->status;
a19259c3 DG	272
	273	dev = urb->context;
	274	if (dev == NULL)
	275	return;
	276
c31fd6c2 ON	277	if (status != 0 &&
	278	status != -ENOENT &&
	279	status != -ECONNRESET &&
	280	status != -ESHUTDOWN)
495f71e2 GKH	281	dev_err(&dev->intf->dev, "%s: urb status: %d\n",
495f71e2 GKH	282	__func__, status);
a19259c3	283
bb1b40c7 AK	284	if (status == 0)
	285	netif_wake_queue(dev->net);
	286	else
	287	// on URB error, trigger immediate poll
	288	schedule_delayed_work(&dev->carrier_work, 0);
a19259c3 DG	289	}
	290
	291	static int ipheth_carrier_set(struct ipheth_device *dev)
	292	{
61c59355	293	struct usb_device *udev;
a19259c3	294	int retval;
61c59355	295
bb1b40c7 AK	296	if (!dev)
	297	return 0;
	298	if (!dev->confirmed_pairing)
	299	return 0;
61c59355 GS	300
61c59355 GS	301	udev = dev->udev;
a19259c3 DG	302	retval = usb_control_msg(udev,
	303	usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
	304	IPHETH_CMD_CARRIER_CHECK, /* request */
	305	0xc0, /* request type */
	306	0x00, /* value */
	307	0x02, /* index */
	308	dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE,
	309	IPHETH_CTRL_TIMEOUT);
	310	if (retval < 0) {
495f71e2 GKH	311	dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
495f71e2 GKH	312	__func__, retval);
a19259c3 DG	313	return retval;
	314	}
	315
bb1b40c7	316	if (dev->ctrl_buf[0] == IPHETH_CARRIER_ON) {
a19259c3	317	netif_carrier_on(dev->net);
bb1b40c7 AK	318	if (dev->tx_urb->status != -EINPROGRESS)
	319	netif_wake_queue(dev->net);
	320	} else {
a19259c3	321	netif_carrier_off(dev->net);
bb1b40c7 AK	322	netif_stop_queue(dev->net);
bb1b40c7 AK	323	}
a19259c3 DG	324	return 0;
	325	}
	326
	327	static void ipheth_carrier_check_work(struct work_struct *work)
	328	{
	329	struct ipheth_device *dev = container_of(work, struct ipheth_device,
	330	carrier_work.work);
	331
	332	ipheth_carrier_set(dev);
	333	schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
	334	}
	335
	336	static int ipheth_get_macaddr(struct ipheth_device *dev)
	337	{
	338	struct usb_device *udev = dev->udev;
	339	struct net_device *net = dev->net;
	340	int retval;
	341
	342	retval = usb_control_msg(udev,
	343	usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
	344	IPHETH_CMD_GET_MACADDR, /* request */
	345	0xc0, /* request type */
	346	0x00, /* value */
	347	0x02, /* index */
	348	dev->ctrl_buf,
	349	IPHETH_CTRL_BUF_SIZE,
	350	IPHETH_CTRL_TIMEOUT);
	351	if (retval < 0) {
495f71e2 GKH	352	dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
495f71e2 GKH	353	__func__, retval);
a19259c3	354	} else if (retval < ETH_ALEN) {
495f71e2 GKH	355	dev_err(&dev->intf->dev,
495f71e2 GKH	356	"%s: usb_control_msg: short packet: %d bytes\n",
a19259c3 DG	357	__func__, retval);
	358	retval = -EINVAL;
	359	} else {
	360	memcpy(net->dev_addr, dev->ctrl_buf, ETH_ALEN);
	361	retval = 0;
	362	}
	363
	364	return retval;
	365	}
	366
	367	static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags)
	368	{
	369	struct usb_device *udev = dev->udev;
	370	int retval;
	371
	372	usb_fill_bulk_urb(dev->rx_urb, udev,
	373	usb_rcvbulkpipe(udev, dev->bulk_in),
	374	dev->rx_buf, IPHETH_BUF_SIZE,
	375	ipheth_rcvbulk_callback,
	376	dev);
	377	dev->rx_urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
	378
	379	retval = usb_submit_urb(dev->rx_urb, mem_flags);
	380	if (retval)
495f71e2 GKH	381	dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
495f71e2 GKH	382	__func__, retval);
a19259c3 DG	383	return retval;
	384	}
	385
	386	static int ipheth_open(struct net_device *net)
	387	{
	388	struct ipheth_device *dev = netdev_priv(net);
	389	struct usb_device *udev = dev->udev;
	390	int retval = 0;
	391
	392	usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM);
	393
	394	retval = ipheth_carrier_set(dev);
	395	if (retval)
	396	return retval;
	397
	398	retval = ipheth_rx_submit(dev, GFP_KERNEL);
	399	if (retval)
	400	return retval;
	401
	402	schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
a19259c3 DG	403	return retval;
	404	}
	405
	406	static int ipheth_close(struct net_device *net)
	407	{
	408	struct ipheth_device *dev = netdev_priv(net);
	409
	410	cancel_delayed_work_sync(&dev->carrier_work);
	411	netif_stop_queue(net);
	412	return 0;
	413	}
	414
	415	static int ipheth_tx(struct sk_buff skb, struct net_device net)
	416	{
	417	struct ipheth_device *dev = netdev_priv(net);
	418	struct usb_device *udev = dev->udev;
	419	int retval;
	420
	421	/* Paranoid */
	422	if (skb->len > IPHETH_BUF_SIZE) {
9c413ed5	423	WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len);
a19259c3	424	dev->net->stats.tx_dropped++;
45611c61	425	dev_kfree_skb_any(skb);
a19259c3 DG	426	return NETDEV_TX_OK;
	427	}
	428
	429	memcpy(dev->tx_buf, skb->data, skb->len);
	430	if (skb->len < IPHETH_BUF_SIZE)
	431	memset(dev->tx_buf + skb->len, 0, IPHETH_BUF_SIZE - skb->len);
	432
	433	usb_fill_bulk_urb(dev->tx_urb, udev,
	434	usb_sndbulkpipe(udev, dev->bulk_out),
	435	dev->tx_buf, IPHETH_BUF_SIZE,
	436	ipheth_sndbulk_callback,
	437	dev);
	438	dev->tx_urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
	439
	440	retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC);
	441	if (retval) {
495f71e2 GKH	442	dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
495f71e2 GKH	443	__func__, retval);
a19259c3	444	dev->net->stats.tx_errors++;
45611c61	445	dev_kfree_skb_any(skb);
a19259c3	446	} else {
a19259c3 DG	447	dev->net->stats.tx_packets++;
a19259c3 DG	448	dev->net->stats.tx_bytes += skb->len;
45611c61	449	dev_consume_skb_any(skb);
a19259c3 DG	450	netif_stop_queue(net);
	451	}
	452
	453	return NETDEV_TX_OK;
	454	}
	455
	456	static void ipheth_tx_timeout(struct net_device *net)
	457	{
	458	struct ipheth_device *dev = netdev_priv(net);
	459
495f71e2	460	dev_err(&dev->intf->dev, "%s: TX timeout\n", __func__);
a19259c3 DG	461	dev->net->stats.tx_errors++;
	462	usb_unlink_urb(dev->tx_urb);
	463	}
	464
a19259c3 DG	465	static u32 ipheth_ethtool_op_get_link(struct net_device *net)
	466	{
	467	struct ipheth_device *dev = netdev_priv(net);
	468	return netif_carrier_ok(dev->net);
	469	}
	470
bc689c97	471	static const struct ethtool_ops ops = {
a19259c3 DG	472	.get_link = ipheth_ethtool_op_get_link
	473	};
	474
	475	static const struct net_device_ops ipheth_netdev_ops = {
8ef207d6	476	.ndo_open = ipheth_open,
	477	.ndo_stop = ipheth_close,
	478	.ndo_start_xmit = ipheth_tx,
	479	.ndo_tx_timeout = ipheth_tx_timeout,
a19259c3 DG	480	};
a19259c3 DG	481
a19259c3 DG	482	static int ipheth_probe(struct usb_interface *intf,
	483	const struct usb_device_id *id)
	484	{
	485	struct usb_device *udev = interface_to_usbdev(intf);
	486	struct usb_host_interface *hintf;
	487	struct usb_endpoint_descriptor *endp;
	488	struct ipheth_device *dev;
	489	struct net_device *netdev;
	490	int i;
	491	int retval;
	492
	493	netdev = alloc_etherdev(sizeof(struct ipheth_device));
	494	if (!netdev)
	495	return -ENOMEM;
	496
	497	netdev->netdev_ops = &ipheth_netdev_ops;
	498	netdev->watchdog_timeo = IPHETH_TX_TIMEOUT;
c9cedbba	499	strcpy(netdev->name, "eth%d");
a19259c3 DG	500
	501	dev = netdev_priv(netdev);
	502	dev->udev = udev;
	503	dev->net = netdev;
	504	dev->intf = intf;
bb1b40c7	505	dev->confirmed_pairing = false;
a19259c3 DG	506	/* Set up endpoints */
	507	hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM);
	508	if (hintf == NULL) {
	509	retval = -ENODEV;
495f71e2	510	dev_err(&intf->dev, "Unable to find alternate settings interface\n");
a19259c3 DG	511	goto err_endpoints;
	512	}
	513
	514	for (i = 0; i < hintf->desc.bNumEndpoints; i++) {
	515	endp = &hintf->endpoint[i].desc;
	516	if (usb_endpoint_is_bulk_in(endp))
	517	dev->bulk_in = endp->bEndpointAddress;
	518	else if (usb_endpoint_is_bulk_out(endp))
	519	dev->bulk_out = endp->bEndpointAddress;
	520	}
	521	if (!(dev->bulk_in && dev->bulk_out)) {
	522	retval = -ENODEV;
495f71e2	523	dev_err(&intf->dev, "Unable to find endpoints\n");
a19259c3 DG	524	goto err_endpoints;
	525	}
	526
	527	dev->ctrl_buf = kmalloc(IPHETH_CTRL_BUF_SIZE, GFP_KERNEL);
	528	if (dev->ctrl_buf == NULL) {
	529	retval = -ENOMEM;
	530	goto err_alloc_ctrl_buf;
	531	}
	532
	533	retval = ipheth_get_macaddr(dev);
	534	if (retval)
	535	goto err_get_macaddr;
	536
	537	INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work);
	538
	539	retval = ipheth_alloc_urbs(dev);
	540	if (retval) {
495f71e2	541	dev_err(&intf->dev, "error allocating urbs: %d\n", retval);
a19259c3 DG	542	goto err_alloc_urbs;
	543	}
	544
	545	usb_set_intfdata(intf, dev);
	546
	547	SET_NETDEV_DEV(netdev, &intf->dev);
7ad24ea4	548	netdev->ethtool_ops = &ops;
a19259c3 DG	549
	550	retval = register_netdev(netdev);
	551	if (retval) {
495f71e2	552	dev_err(&intf->dev, "error registering netdev: %d\n", retval);
a19259c3 DG	553	retval = -EIO;
	554	goto err_register_netdev;
	555	}
bb1b40c7 AK	556	// carrier down and transmit queues stopped until packet from device
	557	netif_carrier_off(netdev);
	558	netif_tx_stop_all_queues(netdev);
a19259c3 DG	559	dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n");
	560	return 0;
	561
	562	err_register_netdev:
	563	ipheth_free_urbs(dev);
	564	err_alloc_urbs:
	565	err_get_macaddr:
	566	err_alloc_ctrl_buf:
	567	kfree(dev->ctrl_buf);
	568	err_endpoints:
	569	free_netdev(netdev);
	570	return retval;
	571	}
	572
	573	static void ipheth_disconnect(struct usb_interface *intf)
	574	{
	575	struct ipheth_device *dev;
	576
	577	dev = usb_get_intfdata(intf);
	578	if (dev != NULL) {
	579	unregister_netdev(dev->net);
	580	ipheth_kill_urbs(dev);
	581	ipheth_free_urbs(dev);
	582	kfree(dev->ctrl_buf);
	583	free_netdev(dev->net);
	584	}
	585	usb_set_intfdata(intf, NULL);
	586	dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n");
	587	}
	588
	589	static struct usb_driver ipheth_driver = {
	590	.name = "ipheth",
	591	.probe = ipheth_probe,
	592	.disconnect = ipheth_disconnect,
	593	.id_table = ipheth_table,
e1f12eb6	594	.disable_hub_initiated_lpm = 1,
a19259c3 DG	595	};
a19259c3 DG	596
d632eb1b	597	module_usb_driver(ipheth_driver);
a19259c3 DG	598
	599	MODULE_AUTHOR("Diego Giagio <[email protected]>");
	600	MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
	601	MODULE_LICENSE("Dual BSD/GPL");