1 files changed, 466 insertions, 0 deletions
diff --git a/drivers/net/usb/cdc-phonet.c b/drivers/net/usb/cdc-phonet.c
new file mode 100644
index 000000000..415ce8b88
--- /dev/null
+++ b/drivers/net/usb/cdc-phonet.c
@@ -0,0 +1,466 @@
+/*
+ * phonet.c -- USB CDC Phonet host driver
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation. All rights reserved.
+ *
+ * Author: Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <linux/usb.h>
+#include <linux/usb/cdc.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/if_phonet.h>
+#include <linux/phonet.h>
+
+#define PN_MEDIA_USB	0x1B
+
+static const unsigned rxq_size = 17;
+
+struct usbpn_dev {
+	struct net_device	*dev;
+
+	struct usb_interface	*intf, *data_intf;
+	struct usb_device	*usb;
+	unsigned int		tx_pipe, rx_pipe;
+	u8 active_setting;
+	u8 disconnected;
+
+	unsigned		tx_queue;
+	spinlock_t		tx_lock;
+
+	spinlock_t		rx_lock;
+	struct sk_buff		*rx_skb;
+	struct urb		*urbs[0];
+};
+
+static void tx_complete(struct urb *req);
+static void rx_complete(struct urb *req);
+
+/*
+ * Network device callbacks
+ */
+static netdev_tx_t usbpn_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct usbpn_dev *pnd = netdev_priv(dev);
+	struct urb *req = NULL;
+	unsigned long flags;
+	int err;
+
+	if (skb->protocol != htons(ETH_P_PHONET))
+		goto drop;
+
+	req = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!req)
+		goto drop;
+	usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len,
+				tx_complete, skb);
+	req->transfer_flags = URB_ZERO_PACKET;
+	err = usb_submit_urb(req, GFP_ATOMIC);
+	if (err) {
+		usb_free_urb(req);
+		goto drop;
+	}
+
+	spin_lock_irqsave(&pnd->tx_lock, flags);
+	pnd->tx_queue++;
+	if (pnd->tx_queue >= dev->tx_queue_len)
+		netif_stop_queue(dev);
+	spin_unlock_irqrestore(&pnd->tx_lock, flags);
+	return NETDEV_TX_OK;
+
+drop:
+	dev_kfree_skb(skb);
+	dev->stats.tx_dropped++;
+	return NETDEV_TX_OK;
+}
+
+static void tx_complete(struct urb *req)
+{
+	struct sk_buff *skb = req->context;
+	struct net_device *dev = skb->dev;
+	struct usbpn_dev *pnd = netdev_priv(dev);
+	int status = req->status;
+
+	switch (status) {
+	case 0:
+		dev->stats.tx_bytes += skb->len;
+		break;
+
+	case -ENOENT:
+	case -ECONNRESET:
+	case -ESHUTDOWN:
+		dev->stats.tx_aborted_errors++;
+	default:
+		dev->stats.tx_errors++;
+		dev_dbg(&dev->dev, "TX error (%d)\n", status);
+	}
+	dev->stats.tx_packets++;
+
+	spin_lock(&pnd->tx_lock);
+	pnd->tx_queue--;
+	netif_wake_queue(dev);
+	spin_unlock(&pnd->tx_lock);
+
+	dev_kfree_skb_any(skb);
+	usb_free_urb(req);
+}
+
+static int rx_submit(struct usbpn_dev *pnd, struct urb *req, gfp_t gfp_flags)
+{
+	struct net_device *dev = pnd->dev;
+	struct page *page;
+	int err;
+
+	page = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC);
+	if (!page)
+		return -ENOMEM;
+
+	usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page),
+				PAGE_SIZE, rx_complete, dev);
+	req->transfer_flags = 0;
+	err = usb_submit_urb(req, gfp_flags);
+	if (unlikely(err)) {
+		dev_dbg(&dev->dev, "RX submit error (%d)\n", err);
+		put_page(page);
+	}
+	return err;
+}
+
+static void rx_complete(struct urb *req)
+{
+	struct net_device *dev = req->context;
+	struct usbpn_dev *pnd = netdev_priv(dev);
+	struct page *page = virt_to_page(req->transfer_buffer);
+	struct sk_buff *skb;
+	unsigned long flags;
+	int status = req->status;
+
+	switch (status) {
+	case 0:
+		spin_lock_irqsave(&pnd->rx_lock, flags);
+		skb = pnd->rx_skb;
+		if (!skb) {
+			skb = pnd->rx_skb = netdev_alloc_skb(dev, 12);
+			if (likely(skb)) {
+				/* Can't use pskb_pull() on page in IRQ */
+				memcpy(skb_put(skb, 1), page_address(page), 1);
+				skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
+						page, 1, req->actual_length,
+						PAGE_SIZE);
+				page = NULL;
+			}
+		} else {
+			skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
+					page, 0, req->actual_length,
+					PAGE_SIZE);
+			page = NULL;
+		}
+		if (req->actual_length < PAGE_SIZE)
+			pnd->rx_skb = NULL; /* Last fragment */
+		else
+			skb = NULL;
+		spin_unlock_irqrestore(&pnd->rx_lock, flags);
+		if (skb) {
+			skb->protocol = htons(ETH_P_PHONET);
+			skb_reset_mac_header(skb);
+			__skb_pull(skb, 1);
+			skb->dev = dev;
+			dev->stats.rx_packets++;
+			dev->stats.rx_bytes += skb->len;
+
+			netif_rx(skb);
+		}
+		goto resubmit;
+
+	case -ENOENT:
+	case -ECONNRESET:
+	case -ESHUTDOWN:
+		req = NULL;
+		break;
+
+	case -EOVERFLOW:
+		dev->stats.rx_over_errors++;
+		dev_dbg(&dev->dev, "RX overflow\n");
+		break;
+
+	case -EILSEQ:
+		dev->stats.rx_crc_errors++;
+		break;
+	}
+
+	dev->stats.rx_errors++;
+resubmit:
+	if (page)
+		put_page(page);
+	if (req)
+		rx_submit(pnd, req, GFP_ATOMIC);
+}
+
+static int usbpn_close(struct net_device *dev);
+
+static int usbpn_open(struct net_device *dev)
+{
+	struct usbpn_dev *pnd = netdev_priv(dev);
+	int err;
+	unsigned i;
+	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
+
+	err = usb_set_interface(pnd->usb, num, pnd->active_setting);
+	if (err)
+		return err;
+
+	for (i = 0; i < rxq_size; i++) {
+		struct urb *req = usb_alloc_urb(0, GFP_KERNEL);
+
+		if (!req || rx_submit(pnd, req, GFP_KERNEL)) {
+			usb_free_urb(req);
+			usbpn_close(dev);
+			return -ENOMEM;
+		}
+		pnd->urbs[i] = req;
+	}
+
+	netif_wake_queue(dev);
+	return 0;
+}
+
+static int usbpn_close(struct net_device *dev)
+{
+	struct usbpn_dev *pnd = netdev_priv(dev);
+	unsigned i;
+	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
+
+	netif_stop_queue(dev);
+
+	for (i = 0; i < rxq_size; i++) {
+		struct urb *req = pnd->urbs[i];
+
+		if (!req)
+			continue;
+		usb_kill_urb(req);
+		usb_free_urb(req);
+		pnd->urbs[i] = NULL;
+	}
+
+	return usb_set_interface(pnd->usb, num, !pnd->active_setting);
+}
+
+static int usbpn_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct if_phonet_req *req = (struct if_phonet_req *)ifr;
+
+	switch (cmd) {
+	case SIOCPNGAUTOCONF:
+		req->ifr_phonet_autoconf.device = PN_DEV_PC;
+		return 0;
+	}
+	return -ENOIOCTLCMD;
+}
+
+static int usbpn_set_mtu(struct net_device *dev, int new_mtu)
+{
+	if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static const struct net_device_ops usbpn_ops = {
+	.ndo_open	= usbpn_open,
+	.ndo_stop	= usbpn_close,
+	.ndo_start_xmit = usbpn_xmit,
+	.ndo_do_ioctl	= usbpn_ioctl,
+	.ndo_change_mtu = usbpn_set_mtu,
+};
+
+static void usbpn_setup(struct net_device *dev)
+{
+	dev->features		= 0;
+	dev->netdev_ops		= &usbpn_ops,
+	dev->header_ops		= &phonet_header_ops;
+	dev->type		= ARPHRD_PHONET;
+	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
+	dev->mtu		= PHONET_MAX_MTU;
+	dev->hard_header_len	= 1;
+	dev->dev_addr[0]	= PN_MEDIA_USB;
+	dev->addr_len		= 1;
+	dev->tx_queue_len	= 3;
+
+	dev->destructor		= free_netdev;
+}
+
+/*
+ * USB driver callbacks
+ */
+static struct usb_device_id usbpn_ids[] = {
+	{
+		.match_flags = USB_DEVICE_ID_MATCH_VENDOR
+			| USB_DEVICE_ID_MATCH_INT_CLASS
+			| USB_DEVICE_ID_MATCH_INT_SUBCLASS,
+		.idVendor = 0x0421, /* Nokia */
+		.bInterfaceClass = USB_CLASS_COMM,
+		.bInterfaceSubClass = 0xFE,
+	},
+	{ },
+};
+
+MODULE_DEVICE_TABLE(usb, usbpn_ids);
+
+static struct usb_driver usbpn_driver;
+
+static int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+	static const char ifname[] = "usbpn%d";
+	const struct usb_cdc_union_desc *union_header = NULL;
+	const struct usb_host_interface *data_desc;
+	struct usb_interface *data_intf;
+	struct usb_device *usbdev = interface_to_usbdev(intf);
+	struct net_device *dev;
+	struct usbpn_dev *pnd;
+	u8 *data;
+	int phonet = 0;
+	int len, err;
+
+	data = intf->altsetting->extra;
+	len = intf->altsetting->extralen;
+	while (len >= 3) {
+		u8 dlen = data[0];
+		if (dlen < 3)
+			return -EINVAL;
+
+		/* bDescriptorType */
+		if (data[1] == USB_DT_CS_INTERFACE) {
+			/* bDescriptorSubType */
+			switch (data[2]) {
+			case USB_CDC_UNION_TYPE:
+				if (union_header || dlen < 5)
+					break;
+				union_header =
+					(struct usb_cdc_union_desc *)data;
+				break;
+			case 0xAB:
+				phonet = 1;
+				break;
+			}
+		}
+		data += dlen;
+		len -= dlen;
+	}
+
+	if (!union_header || !phonet)
+		return -EINVAL;
+
+	data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
+	if (data_intf == NULL)
+		return -ENODEV;
+	/* Data interface has one inactive and one active setting */
+	if (data_intf->num_altsetting != 2)
+		return -EINVAL;
+	if (data_intf->altsetting[0].desc.bNumEndpoints == 0 &&
+	    data_intf->altsetting[1].desc.bNumEndpoints == 2)
+		data_desc = data_intf->altsetting + 1;
+	else
+	if (data_intf->altsetting[0].desc.bNumEndpoints == 2 &&
+	    data_intf->altsetting[1].desc.bNumEndpoints == 0)
+		data_desc = data_intf->altsetting;
+	else
+		return -EINVAL;
+
+	dev = alloc_netdev(sizeof(*pnd) + sizeof(pnd->urbs[0]) * rxq_size,
+			   ifname, NET_NAME_UNKNOWN, usbpn_setup);
+	if (!dev)
+		return -ENOMEM;
+
+	pnd = netdev_priv(dev);
+	SET_NETDEV_DEV(dev, &intf->dev);
+
+	pnd->dev = dev;
+	pnd->usb = usbdev;
+	pnd->intf = intf;
+	pnd->data_intf = data_intf;
+	spin_lock_init(&pnd->tx_lock);
+	spin_lock_init(&pnd->rx_lock);
+	/* Endpoints */
+	if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) {
+		pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
+			data_desc->endpoint[0].desc.bEndpointAddress);
+		pnd->tx_pipe = usb_sndbulkpipe(usbdev,
+			data_desc->endpoint[1].desc.bEndpointAddress);
+	} else {
+		pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
+			data_desc->endpoint[1].desc.bEndpointAddress);
+		pnd->tx_pipe = usb_sndbulkpipe(usbdev,
+			data_desc->endpoint[0].desc.bEndpointAddress);
+	}
+	pnd->active_setting = data_desc - data_intf->altsetting;
+
+	err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd);
+	if (err)
+		goto out;
+
+	/* Force inactive mode until the network device is brought UP */
+	usb_set_interface(usbdev, union_header->bSlaveInterface0,
+				!pnd->active_setting);
+	usb_set_intfdata(intf, pnd);
+
+	err = register_netdev(dev);
+	if (err) {
+		usb_driver_release_interface(&usbpn_driver, data_intf);
+		goto out;
+	}
+
+	dev_dbg(&dev->dev, "USB CDC Phonet device found\n");
+	return 0;
+
+out:
+	usb_set_intfdata(intf, NULL);
+	free_netdev(dev);
+	return err;
+}
+
+static void usbpn_disconnect(struct usb_interface *intf)
+{
+	struct usbpn_dev *pnd = usb_get_intfdata(intf);
+
+	if (pnd->disconnected)
+		return;
+
+	pnd->disconnected = 1;
+	usb_driver_release_interface(&usbpn_driver,
+			(pnd->intf == intf) ? pnd->data_intf : pnd->intf);
+	unregister_netdev(pnd->dev);
+}
+
+static struct usb_driver usbpn_driver = {
+	.name =		"cdc_phonet",
+	.probe =	usbpn_probe,
+	.disconnect =	usbpn_disconnect,
+	.id_table =	usbpn_ids,
+	.disable_hub_initiated_lpm = 1,
+};
+
+module_usb_driver(usbpn_driver);
+
+MODULE_AUTHOR("Remi Denis-Courmont");
+MODULE_DESCRIPTION("USB CDC Phonet host interface");
+MODULE_LICENSE("GPL");