/*
* 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>
#define USB_VENDOR_APPLE 0x05ac
#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_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;
};
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->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;
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)
{
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 <diego@giagio.com>");
MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
MODULE_LICENSE("Dual BSD/GPL");
