Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 548 insertions, 0 deletions

diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c
new file mode 100644
index 000000000..6a769df0b
--- /dev/null
+++ b/drivers/net/usb/ipheth.c
@@ -0,0 +1,548 @@
+/*
+ * 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         1514
+#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 + IPHETH_IP_ALIGN,
+				    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 + IPHETH_IP_ALIGN, 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 {
+		eth_hw_addr_set(net, dev->ctrl_buf);
+		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_IP_ALIGN,
+			  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 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_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, 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;
+	/* 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");