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Subject[PATCH] drivers/net/usb: Add new driver ipheth
Date
From: Diego Giagio <diego@giagio.com>

Add new driver to use tethering with an iPhone device. After initial submission,
apply fixes to fit the new driver into the kernel standards.

There are still a couple of minor (almost cosmetic-level) issues, but the driver
is fully functional right now.

Signed-off-by: L. Alberto Giménez <agimenez@sysvalve.es>
---
This time I've cleared the authorship as requested by David. Diego is the
original author of the code, although Daniel Borca has contributed a lot of
changes as well (I did the kernel-tree integration and fixed checkpatch issues
as well as some of the problems pointed out in the list on previous
submissions).
Diego and/or Daniel: please sign-off (specially Diego since he is the one who
will be officially attributed as the driver author) this patch so the authorship
and DCO is clear.

drivers/net/Makefile | 1 +
drivers/net/usb/Kconfig | 12 +
drivers/net/usb/Makefile | 1 +
drivers/net/usb/ipheth.c | 568 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 582 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/usb/ipheth.c
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index a583b50..12b280a 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -273,6 +273,7 @@ obj-$(CONFIG_USB_RTL8150) += usb/
obj-$(CONFIG_USB_HSO) += usb/
obj-$(CONFIG_USB_USBNET) += usb/
obj-$(CONFIG_USB_ZD1201) += usb/
+obj-$(CONFIG_USB_IPHETH) += usb/

obj-y += wireless/
obj-$(CONFIG_NET_TULIP) += tulip/
diff --git a/drivers/net/usb/Kconfig b/drivers/net/usb/Kconfig
index ba56ce4..63be4ca 100644
--- a/drivers/net/usb/Kconfig
+++ b/drivers/net/usb/Kconfig
@@ -385,4 +385,16 @@ config USB_CDC_PHONET
cellular modem, as found on most Nokia handsets with the
"PC suite" USB profile.

+config USB_IPHETH
+ tristate "Apple iPhone USB Ethernet driver"
+ default n
+ ---help---
+ Module used to share Internet connection (tethering) from your
+ iPhone (Original, 3G and 3GS) to your system.
+ Note that you need userspace libraries and programs that are needed
+ to pair your device with your system and that understand the iPhone
+ protocol.
+
+ For more information: http://giagio.com/wiki/moin.cgi/iPhoneEthernetDriver
+
endmenu
diff --git a/drivers/net/usb/Makefile b/drivers/net/usb/Makefile
index 82ea629..edb09c0 100644
--- a/drivers/net/usb/Makefile
+++ b/drivers/net/usb/Makefile
@@ -23,4 +23,5 @@ obj-$(CONFIG_USB_NET_MCS7830) += mcs7830.o
obj-$(CONFIG_USB_USBNET) += usbnet.o
obj-$(CONFIG_USB_NET_INT51X1) += int51x1.o
obj-$(CONFIG_USB_CDC_PHONET) += cdc-phonet.o
+obj-$(CONFIG_USB_IPHETH) += ipheth.o

diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c
new file mode 100644
index 0000000..fd10331
--- /dev/null
+++ b/drivers/net/usb/ipheth.c
@@ -0,0 +1,568 @@
+/*
+ * 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/init.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 IPHETH_USBINTF_CLASS 255
+#define IPHETH_USBINTF_SUBCLASS 253
+#define IPHETH_USBINTF_PROTO 1
+
+#define IPHETH_BUF_SIZE 1516
+#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 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) },
+ { }
+};
+MODULE_DEVICE_TABLE(usb, ipheth_table);
+
+struct ipheth_device {
+ struct usb_device *udev;
+ struct usb_interface *intf;
+ struct net_device *net;
+ struct sk_buff *tx_skb;
+ 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;
+};
+
+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;
+
+ rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (rx_urb == NULL)
+ goto error;
+
+ tx_buf = usb_buffer_alloc(iphone->udev,
+ IPHETH_BUF_SIZE,
+ GFP_KERNEL,
+ &tx_urb->transfer_dma);
+ if (tx_buf == NULL)
+ goto error;
+
+ rx_buf = usb_buffer_alloc(iphone->udev,
+ IPHETH_BUF_SIZE,
+ GFP_KERNEL,
+ &rx_urb->transfer_dma);
+ if (rx_buf == NULL)
+ goto error;
+
+
+ iphone->tx_urb = tx_urb;
+ iphone->rx_urb = rx_urb;
+ iphone->tx_buf = tx_buf;
+ iphone->rx_buf = rx_buf;
+ return 0;
+
+error:
+ usb_buffer_free(iphone->udev, IPHETH_BUF_SIZE, rx_buf,
+ rx_urb->transfer_dma);
+ usb_buffer_free(iphone->udev, IPHETH_BUF_SIZE, tx_buf,
+ tx_urb->transfer_dma);
+ usb_free_urb(rx_urb);
+ usb_free_urb(tx_urb);
+ return -ENOMEM;
+}
+
+static void ipheth_free_urbs(struct ipheth_device *iphone)
+{
+ usb_buffer_free(iphone->udev, IPHETH_BUF_SIZE, iphone->rx_buf,
+ iphone->rx_urb->transfer_dma);
+ usb_buffer_free(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:
+ return;
+ case 0:
+ break;
+ default:
+ err("%s: urb status: %d", __func__, urb->status);
+ return;
+ }
+
+ len = urb->actual_length;
+ buf = urb->transfer_buffer;
+
+ skb = dev_alloc_skb(NET_IP_ALIGN + len);
+ if (!skb) {
+ err("%s: dev_alloc_skb: -ENOMEM", __func__);
+ dev->net->stats.rx_dropped++;
+ return;
+ }
+
+ skb_reserve(skb, NET_IP_ALIGN);
+ memcpy(skb_put(skb, len), buf + NET_IP_ALIGN, len - NET_IP_ALIGN);
+ 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);
+ ipheth_rx_submit(dev, GFP_ATOMIC);
+}
+
+static void ipheth_sndbulk_callback(struct urb *urb)
+{
+ struct ipheth_device *dev;
+
+ dev = urb->context;
+ if (dev == NULL)
+ return;
+
+ if (urb->status != 0 &&
+ urb->status != -ENOENT &&
+ urb->status != -ECONNRESET &&
+ urb->status != -ESHUTDOWN)
+ err("%s: urb status: %d", __func__, urb->status);
+
+ dev_kfree_skb_irq(dev->tx_skb);
+ netif_wake_queue(dev->net);
+}
+
+static int ipheth_carrier_set(struct ipheth_device *dev)
+{
+ struct usb_device *udev = dev->udev;
+ int retval;
+
+ 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) {
+ err("%s: usb_control_msg: %d", __func__, retval);
+ return retval;
+ }
+
+ if (dev->ctrl_buf[0] == IPHETH_CARRIER_ON)
+ netif_carrier_on(dev->net);
+ else
+ netif_carrier_off(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) {
+ err("%s: usb_control_msg: %d", __func__, retval);
+ } else if (retval < ETH_ALEN) {
+ err("%s: usb_control_msg: short packet: %d bytes",
+ __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)
+ err("%s: usb_submit_urb: %d", __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);
+ netif_start_queue(net);
+ 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", __func__, skb->len);
+ dev->net->stats.tx_dropped++;
+ dev_kfree_skb_irq(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) {
+ err("%s: usb_submit_urb: %d", __func__, retval);
+ dev->net->stats.tx_errors++;
+ dev_kfree_skb_irq(skb);
+ } else {
+ dev->tx_skb = skb;
+
+ dev->net->stats.tx_packets++;
+ dev->net->stats.tx_bytes += skb->len;
+ netif_stop_queue(net);
+ }
+
+ return NETDEV_TX_OK;
+}
+
+static void ipheth_tx_timeout(struct net_device *net)
+{
+ struct ipheth_device *dev = netdev_priv(net);
+
+ err("%s: TX timeout", __func__);
+ dev->net->stats.tx_errors++;
+ usb_unlink_urb(dev->tx_urb);
+}
+
+static struct net_device_stats *ipheth_stats(struct net_device *net)
+{
+ struct ipheth_device *dev = netdev_priv(net);
+ return &dev->net->stats;
+}
+
+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 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,
+ .ndo_get_stats = &ipheth_stats,
+};
+
+static struct device_type ipheth_type = {
+ .name = "wwan",
+};
+
+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, "wwan%d");
+
+ dev = netdev_priv(netdev);
+ dev->udev = udev;
+ dev->net = netdev;
+ dev->intf = intf;
+
+ /* Set up endpoints */
+ hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM);
+ if (hintf == NULL) {
+ retval = -ENODEV;
+ err("Unable to find alternate settings interface");
+ 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;
+ err("Unable to find endpoints");
+ 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) {
+ err("error allocating urbs: %d", retval);
+ goto err_alloc_urbs;
+ }
+
+ usb_set_intfdata(intf, dev);
+
+ SET_NETDEV_DEV(netdev, &intf->dev);
+ SET_ETHTOOL_OPS(netdev, &ops);
+ SET_NETDEV_DEVTYPE(netdev, &ipheth_type);
+
+ retval = register_netdev(netdev);
+ if (retval) {
+ err("error registering netdev: %d", retval);
+ retval = -EIO;
+ goto err_register_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,
+};
+
+static int __init ipheth_init(void)
+{
+ int retval;
+
+ retval = usb_register(&ipheth_driver);
+ if (retval) {
+ err("usb_register failed: %d", retval);
+ return retval;
+ }
+ return 0;
+}
+
+static void __exit ipheth_exit(void)
+{
+ usb_deregister(&ipheth_driver);
+}
+
+module_init(ipheth_init);
+module_exit(ipheth_exit);
+
+MODULE_AUTHOR("Diego Giagio <diego@giagio.com>");
+MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
+MODULE_LICENSE("Dual BSD/GPL");
--
1.7.0
--
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