drivers/net/usb: Add new driver ipheth
authorDiego Giagio <diego@giagio.com>
Sun, 18 Apr 2010 08:35:16 +0000 (08:35 +0000)
committerDavid S. Miller <davem@davemloft.net>
Thu, 22 Apr 2010 05:43:18 +0000 (22:43 -0700)
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>
Signed-off-by: Diego Giagio <diego@giagio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/Makefile
drivers/net/usb/Kconfig
drivers/net/usb/Makefile
drivers/net/usb/ipheth.c [new file with mode: 0644]

index a583b50d9de8bd4402fccefed7ae6effa6ff4ff8..12b280afdd5186216254b82c6b0f481e221de129 100644 (file)
@@ -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/
index ba56ce4382d9246969d672c299cb7f61dea45abd..63be4caec70ef052bb0bdb50aedae7b1fb46cad8 100644 (file)
@@ -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
index 82ea62955b56e5188b272bdb071decc44c5da06c..edb09c0ddf8e167b7020ccff7d10f85d7d846943 100644 (file)
@@ -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 (file)
index 0000000..fd10331
--- /dev/null
@@ -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");