usb driver for intellon int51x1 based PLC like devolo dlan duo

	  To compile this driver as a module, choose M here: the

	  module will be called hso.

config USB_NET_INT51X1

	tristate "Intellon PLC based usb adapter"

	depends on USB_USBNET

	help

	  Choose this option if you're using a 14Mb USB-based PLC

	  (Powerline Communications) solution with an Intellon

	  INT51x1/INT5200 chip, like the "devolo dLan duo".

endmenu

obj-$(CONFIG_USB_NET_ZAURUS)	+= zaurus.o

obj-$(CONFIG_USB_NET_MCS7830)	+= mcs7830.o

obj-$(CONFIG_USB_USBNET)	+= usbnet.o

obj-$(CONFIG_USB_NET_INT51X1)	+= int51x1.o

/*

 * Copyright (c) 2009 Peter Holik

 *

 * Intellon usb PLC (Powerline Communications) usb net driver

 *

 * http://www.tandel.be/downloads/INT51X1_Datasheet.pdf

 *

 * Based on the work of Jan 'RedBully' Seiffert

 */

/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or.

 * (at your option) any later version.

 *

 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */

#include <linux/module.h>

#include <linux/ctype.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/ethtool.h>

#include <linux/mii.h>

#include <linux/usb.h>

#include <linux/usb/usbnet.h>

#define INT51X1_VENDOR_ID	0x09e1

#define INT51X1_PRODUCT_ID	0x5121

#define INT51X1_HEADER_SIZE	2	/* 2 byte header */

#define PACKET_TYPE_PROMISCUOUS		(1 << 0)

#define PACKET_TYPE_ALL_MULTICAST	(1 << 1) /* no filter */

#define PACKET_TYPE_DIRECTED		(1 << 2)

#define PACKET_TYPE_BROADCAST		(1 << 3)

#define PACKET_TYPE_MULTICAST		(1 << 4) /* filtered */

#define SET_ETHERNET_PACKET_FILTER	0x43

static int int51x1_rx_fixup(struct usbnet *dev, struct sk_buff *skb)

{

	int len;

	if (!(pskb_may_pull(skb, INT51X1_HEADER_SIZE))) {

		deverr(dev, "unexpected tiny rx frame");

		return 0;

	}

	len = le16_to_cpu(*(__le16 *)&skb->data[skb->len - 2]);

	skb_trim(skb, len);

	return 1;

}

static struct sk_buff *int51x1_tx_fixup(struct usbnet *dev,

		struct sk_buff *skb, gfp_t flags)

{

	int pack_len = skb->len;

	int pack_with_header_len = pack_len + INT51X1_HEADER_SIZE;

	int headroom = skb_headroom(skb);

	int tailroom = skb_tailroom(skb);

	int need_tail = 0;

	__le16 *len;

	/* if packet and our header is smaler than 64 pad to 64 (+ ZLP) */

	if ((pack_with_header_len) < dev->maxpacket)

		need_tail = dev->maxpacket - pack_with_header_len + 1;

	/*

	 * usbnet would send a ZLP if packetlength mod urbsize == 0 for us,

	 * but we need to know ourself, because this would add to the length

	 * we send down to the device...

	 */

	else if (!(pack_with_header_len % dev->maxpacket))

		need_tail = 1;

	if (!skb_cloned(skb) &&

			(headroom + tailroom >= need_tail + INT51X1_HEADER_SIZE)) {

		if (headroom < INT51X1_HEADER_SIZE || tailroom < need_tail) {

			skb->data = memmove(skb->head + INT51X1_HEADER_SIZE,

					skb->data, skb->len);

			skb_set_tail_pointer(skb, skb->len);

		}

	} else {

		struct sk_buff *skb2;

		skb2 = skb_copy_expand(skb,

				INT51X1_HEADER_SIZE,

				need_tail,

				flags);

		dev_kfree_skb_any(skb);

		if (!skb2)

			return NULL;

		skb = skb2;

	}

	pack_len += need_tail;

	pack_len &= 0x07ff;

	len = (__le16 *) __skb_push(skb, INT51X1_HEADER_SIZE);

	*len = cpu_to_le16(pack_len);

	if(need_tail)

		memset(__skb_put(skb, need_tail), 0, need_tail);

	return skb;

}

static void int51x1_async_cmd_callback(struct urb *urb)

{

	struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;

	int status = urb->status;

	if (status < 0)

		dev_warn(&urb->dev->dev, "async callback failed with %d\n", status);

	kfree(req);

	usb_free_urb(urb);

}

static void int51x1_set_multicast(struct net_device *netdev)

{

	struct usb_ctrlrequest *req;

	int status;

	struct urb *urb;

	struct usbnet *dev = netdev_priv(netdev);

	u16 filter = PACKET_TYPE_DIRECTED | PACKET_TYPE_BROADCAST;

	if (netdev->flags & IFF_PROMISC) {

		/* do not expect to see traffic of other PLCs */

		filter |= PACKET_TYPE_PROMISCUOUS;

		devinfo(dev, "promiscuous mode enabled");

	} else if (netdev->mc_count ||

		  (netdev->flags & IFF_ALLMULTI)) {

		filter |= PACKET_TYPE_ALL_MULTICAST;

		devdbg(dev, "receive all multicast enabled");

	} else {

		/* ~PROMISCUOUS, ~MULTICAST */

		devdbg(dev, "receive own packets only");

	}

	urb = usb_alloc_urb(0, GFP_ATOMIC);

	if (!urb) {

		devwarn(dev, "Error allocating URB");

		return;

	}

	req = kmalloc(sizeof(*req), GFP_ATOMIC);

	if (!req) {

		devwarn(dev, "Error allocating control msg");

		goto out;

	}

	req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;

	req->bRequest = SET_ETHERNET_PACKET_FILTER;

	req->wValue = cpu_to_le16(filter);

	req->wIndex = 0;

	req->wLength = 0;

	usb_fill_control_urb(urb, dev->udev, usb_sndctrlpipe(dev->udev, 0),

		(void *)req, NULL, 0,

		int51x1_async_cmd_callback,

		(void *)req);

	status = usb_submit_urb(urb, GFP_ATOMIC);

	if (status < 0) {

		devwarn(dev, "Error submitting control msg, sts=%d", status);

		goto out1;

	}

	return;

out1:

	kfree(req);

out:

	usb_free_urb(urb);

}

static const struct net_device_ops int51x1_netdev_ops = {

	.ndo_open		= usbnet_open,

	.ndo_stop		= usbnet_stop,

	.ndo_start_xmit		= usbnet_start_xmit,

	.ndo_tx_timeout		= usbnet_tx_timeout,

	.ndo_change_mtu		= usbnet_change_mtu,

	.ndo_set_mac_address	= eth_mac_addr,

	.ndo_validate_addr	= eth_validate_addr,

	.ndo_set_multicast_list	= int51x1_set_multicast,

};

static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf)

{

	int status = usbnet_get_ethernet_addr(dev, 3);

	if (status)

		return status;

	dev->net->hard_header_len += INT51X1_HEADER_SIZE;

	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;

	dev->net->netdev_ops = &int51x1_netdev_ops;

	return usbnet_get_endpoints(dev, intf);

}

static const struct driver_info int51x1_info = {

	.description = "Intellon usb powerline adapter",

	.bind        = int51x1_bind,

	.rx_fixup    = int51x1_rx_fixup,

	.tx_fixup    = int51x1_tx_fixup,

	.in          = 1,

	.out         = 2,

	.flags       = FLAG_ETHER,

};

static const struct usb_device_id products[] = {

	{

	USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID),

		.driver_info = (unsigned long) &int51x1_info,

	},

	{},

};

MODULE_DEVICE_TABLE(usb, products);

static struct usb_driver int51x1_driver = {

	.name       = "int51x1",

	.id_table   = products,

	.probe      = usbnet_probe,

	.disconnect = usbnet_disconnect,

	.suspend    = usbnet_suspend,

	.resume     = usbnet_resume,

};

static int __init int51x1_init(void)

{

	return usb_register(&int51x1_driver);

}

module_init(int51x1_init);

static void __exit int51x1_exit(void)

{

	usb_deregister(&int51x1_driver);

}

module_exit(int51x1_exit);

MODULE_AUTHOR("Peter Holik");

MODULE_DESCRIPTION("Intellon usb powerline adapter");

MODULE_LICENSE("GPL");