Subject: USB: usbnet (4/9) module for net1080 cables

From: David Brownell <[email-masked]>
Date: Sat, 13 Aug 2005 14:09:44 -0700

The most significant of these being some LapLink products.
Like the "simple" and "asix" drivers, this just moves the net1080 support
into its one driver module.  In this case there's a small bit of extra
cleanup involved, moving some funky framing logic into the tx_fixup()
routine (resolving a long overdue FIXME).

Minor historical note:  "usbnet" started out as "net1080", then got
generalized.

Signed-off-by: David Brownell <[email-masked]>
Signed-off-by: Greg Kroah-Hartman <[email-masked]>

---
 drivers/usb/net/Kconfig   |   18 -
 drivers/usb/net/Makefile  |    1 
 drivers/usb/net/net1080.c |  618 ++++++++++++++++++++++++++++++++++++++++++++++
 drivers/usb/net/usbnet.c  |  571 ------------------------------------------
 4 files changed, 628 insertions(+), 580 deletions(-)

--- gregkh-2.6.orig/drivers/usb/net/Makefile	2005-08-15 17:51:17.000000000 -0700
+++ gregkh-2.6/drivers/usb/net/Makefile	2005-08-15 17:51:21.000000000 -0700
@@ -7,6 +7,7 @@
 obj-$(CONFIG_USB_PEGASUS)	+= pegasus.o
 obj-$(CONFIG_USB_RTL8150)	+= rtl8150.o
 obj-$(CONFIG_USB_NET_AX8817X)	+= asix.o
+obj-$(CONFIG_USB_NET_NET1080)	+= net1080.o
 obj-$(CONFIG_USB_NET_SIMPLE)	+= simple.o
 obj-$(CONFIG_USB_USBNET)	+= usbnet.o
 obj-$(CONFIG_USB_ZD1201)	+= zd1201.o
--- gregkh-2.6.orig/drivers/usb/net/Kconfig	2005-08-15 17:51:17.000000000 -0700
+++ gregkh-2.6/drivers/usb/net/Kconfig	2005-08-15 17:51:21.000000000 -0700
@@ -138,15 +138,6 @@
 
 	  Note that the half-duplex "GL620USB" is not supported.
 
-config USB_NET1080
-	boolean "NetChip 1080 based cables (Laplink, ...)"
-	default y
-	depends on USB_USBNET
-	help
-	  Choose this option if you're using a host-to-host cable based
-	  on this design:  one NetChip 1080 chips and supporting logic,
-	  supporting LEDs that indicate traffic
-
 config USB_PL2301
 	boolean "Prolific PL-2301/2302 based cables"
 	default y
@@ -233,6 +224,15 @@
 	  what other networking devices you have in use.  

+config USB_NET_NET1080
+	tristate "NetChip 1080 based cables (Laplink, ...)"
+	default y
+	depends on USB_USBNET
+	help
+	  Choose this option if you're using a host-to-host cable based
+	  on this design:  one NetChip 1080 chips and supporting logic,
+	  supporting LEDs that indicate traffic
+
 config USB_NET_SIMPLE
 	tristate "Simple USB Network Links"
 	depends on USB_USBNET
--- gregkh-2.6.orig/drivers/usb/net/usbnet.c	2005-08-15 17:51:17.000000000 -0700
+++ gregkh-2.6/drivers/usb/net/usbnet.c	2005-08-15 17:51:21.000000000 -0700
@@ -119,7 +119,6 @@
 #   define DEBUG
 #endif
 #include <linux/module.h>
-#include <linux/kmod.h>
 #include <linux/sched.h>
 #include <linux/init.h>
 #include <linux/netdevice.h>
@@ -128,10 +127,6 @@
 #include <linux/workqueue.h>
 #include <linux/mii.h>
 #include <linux/usb.h>
-#include <linux/mm.h>
-#include <linux/dma-mapping.h>
-
-#include <asm/unaligned.h>
 
 #include "usbnet.h"
 
@@ -1026,531 +1021,6 @@

 
-#ifdef	CONFIG_USB_NET1080
-#define	HAVE_HARDWARE
-
-/*-------------------------------------------------------------------------
- *
- * Netchip 1080 driver ... http://www.netchip.com
- * Used in LapLink cables
- *
- *-------------------------------------------------------------------------*/
-
-#define frame_errors	data[1]
-
-/*
- * NetChip framing of ethernet packets, supporting additional error
- * checks for links that may drop bulk packets from inside messages.
- * Odd USB length == always short read for last usb packet.
- *	- nc_header
- *	- Ethernet header (14 bytes)
- *	- payload
- *	- (optional padding byte, if needed so length becomes odd)
- *	- nc_trailer
- *
- * This framing is to be avoided for non-NetChip devices.
- */
-
-struct nc_header {		// packed:
-	__le16	hdr_len;		// sizeof nc_header (LE, all)
-	__le16	packet_len;		// payload size (including ethhdr)
-	__le16	packet_id;		// detects dropped packets
-#define MIN_HEADER	6
-
-	// all else is optional, and must start with:
-	// u16	vendorId;		// from usb-if
-	// u16	productId;
-} __attribute__((__packed__));
-
-#define	PAD_BYTE	((unsigned char)0xAC)
-
-struct nc_trailer {
-	__le16	packet_id;
-} __attribute__((__packed__));
-
-// packets may use FLAG_FRAMING_NC and optional pad
-#define FRAMED_SIZE(mtu) (sizeof (struct nc_header) \
-				+ sizeof (struct ethhdr) \
-				+ (mtu) \
-				+ 1 \
-				+ sizeof (struct nc_trailer))
-
-#define MIN_FRAMED	FRAMED_SIZE(0)
-
-/* packets _could_ be up to 64KB... */
-#define NC_MAX_PACKET	32767
-
-
-/*
- * Zero means no timeout; else, how long a 64 byte bulk packet may be queued
- * before the hardware drops it.  If that's done, the driver will need to
- * frame network packets to guard against the dropped USB packets.  The win32
- * driver sets this for both sides of the link.
- */
-#define	NC_READ_TTL_MS	((u8)255)	// ms
-
-/*
- * We ignore most registers and EEPROM contents.
- */
-#define	REG_USBCTL	((u8)0x04)
-#define REG_TTL		((u8)0x10)
-#define REG_STATUS	((u8)0x11)
-
-/*
- * Vendor specific requests to read/write data
- */
-#define	REQUEST_REGISTER	((u8)0x10)
-#define	REQUEST_EEPROM		((u8)0x11)
-
-static int
-nc_vendor_read (struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr)
-{
-	int status = usb_control_msg (dev->udev,
-		usb_rcvctrlpipe (dev->udev, 0),
-		req,
-		USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-		0, regnum,
-		retval_ptr, sizeof *retval_ptr,
-		CONTROL_TIMEOUT_MS);
-	if (status > 0)
-		status = 0;
-	if (!status)
-		le16_to_cpus (retval_ptr);
-	return status;
-}
-
-static inline int
-nc_register_read (struct usbnet *dev, u8 regnum, u16 *retval_ptr)
-{
-	return nc_vendor_read (dev, REQUEST_REGISTER, regnum, retval_ptr);
-}
-
-// no retval ... can become async, usable in_interrupt()
-static void
-nc_vendor_write (struct usbnet *dev, u8 req, u8 regnum, u16 value)
-{
-	usb_control_msg (dev->udev,
-		usb_sndctrlpipe (dev->udev, 0),
-		req,
-		USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-		value, regnum,
-		NULL, 0,			// data is in setup packet
-		CONTROL_TIMEOUT_MS);
-}
-
-static inline void
-nc_register_write (struct usbnet *dev, u8 regnum, u16 value)
-{
-	nc_vendor_write (dev, REQUEST_REGISTER, regnum, value);
-}
-
-
-#if 0
-static void nc_dump_registers (struct usbnet *dev)
-{
-	u8	reg;
-	u16	*vp = kmalloc (sizeof (u16));
-
-	if (!vp) {
-		dbg ("no memory?");
-		return;
-	}
-
-	dbg ("%s registers:", dev->net->name);
-	for (reg = 0; reg < 0x20; reg++) {
-		int retval;
-
-		// reading some registers is trouble
-		if (reg >= 0x08 && reg <= 0xf)
-			continue;
-		if (reg >= 0x12 && reg <= 0x1e)
-			continue;
-
-		retval = nc_register_read (dev, reg, vp);
-		if (retval < 0)
-			dbg ("%s reg [0x%x] ==> error %d",
-				dev->net->name, reg, retval);
-		else
-			dbg ("%s reg [0x%x] = 0x%x",
-				dev->net->name, reg, *vp);
-	}
-	kfree (vp);
-}
-#endif
-
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * Control register
- */
-
-#define	USBCTL_WRITABLE_MASK	0x1f0f
-// bits 15-13 reserved, r/o
-#define	USBCTL_ENABLE_LANG	(1 << 12)
-#define	USBCTL_ENABLE_MFGR	(1 << 11)
-#define	USBCTL_ENABLE_PROD	(1 << 10)
-#define	USBCTL_ENABLE_SERIAL	(1 << 9)
-#define	USBCTL_ENABLE_DEFAULTS	(1 << 8)
-// bits 7-4 reserved, r/o
-#define	USBCTL_FLUSH_OTHER	(1 << 3)
-#define	USBCTL_FLUSH_THIS	(1 << 2)
-#define	USBCTL_DISCONN_OTHER	(1 << 1)
-#define	USBCTL_DISCONN_THIS	(1 << 0)
-
-static inline void nc_dump_usbctl (struct usbnet *dev, u16 usbctl)
-{
-	if (!netif_msg_link (dev))
-		return;
-	devdbg (dev, "net1080 %s-%s usbctl 0x%x:%s%s%s%s%s;"
-			" this%s%s;"
-			" other%s%s; r/o 0x%x",
-		dev->udev->bus->bus_name, dev->udev->devpath,
-		usbctl,
-		(usbctl & USBCTL_ENABLE_LANG) ? " lang" : "",
-		(usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "",
-		(usbctl & USBCTL_ENABLE_PROD) ? " prod" : "",
-		(usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "",
-		(usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "",
-
-		(usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "",
-		(usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "",
-		(usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "",
-		(usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "",
-		usbctl & ~USBCTL_WRITABLE_MASK
-		);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * Status register
- */
-
-#define	STATUS_PORT_A		(1 << 15)
-
-#define	STATUS_CONN_OTHER	(1 << 14)
-#define	STATUS_SUSPEND_OTHER	(1 << 13)
-#define	STATUS_MAILBOX_OTHER	(1 << 12)
-#define	STATUS_PACKETS_OTHER(n)	(((n) >> 8) && 0x03)
-
-#define	STATUS_CONN_THIS	(1 << 6)
-#define	STATUS_SUSPEND_THIS	(1 << 5)
-#define	STATUS_MAILBOX_THIS	(1 << 4)
-#define	STATUS_PACKETS_THIS(n)	(((n) >> 0) && 0x03)
-
-#define	STATUS_UNSPEC_MASK	0x0c8c
-#define	STATUS_NOISE_MASK 	((u16)~(0x0303|STATUS_UNSPEC_MASK))
-
-
-static inline void nc_dump_status (struct usbnet *dev, u16 status)
-{
-	if (!netif_msg_link (dev))
-		return;
-	devdbg (dev, "net1080 %s-%s status 0x%x:"
-			" this (%c) PKT=%d%s%s%s;"
-			" other PKT=%d%s%s%s; unspec 0x%x",
-		dev->udev->bus->bus_name, dev->udev->devpath,
-		status,
-
-		// XXX the packet counts don't seem right
-		// (1 at reset, not 0); maybe UNSPEC too
-
-		(status & STATUS_PORT_A) ? 'A' : 'B',
-		STATUS_PACKETS_THIS (status),
-		(status & STATUS_CONN_THIS) ? " CON" : "",
-		(status & STATUS_SUSPEND_THIS) ? " SUS" : "",
-		(status & STATUS_MAILBOX_THIS) ? " MBOX" : "",
-
-		STATUS_PACKETS_OTHER (status),
-		(status & STATUS_CONN_OTHER) ? " CON" : "",
-		(status & STATUS_SUSPEND_OTHER) ? " SUS" : "",
-		(status & STATUS_MAILBOX_OTHER) ? " MBOX" : "",
-
-		status & STATUS_UNSPEC_MASK
-		);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * TTL register
- */
-
-#define	TTL_THIS(ttl)	(0x00ff & ttl)
-#define	TTL_OTHER(ttl)	(0x00ff & (ttl >> 8))
-#define MK_TTL(this,other)	((u16)(((other)<<8)|(0x00ff&(this))))
-
-static inline void nc_dump_ttl (struct usbnet *dev, u16 ttl)
-{
-	if (netif_msg_link (dev))
-		devdbg (dev, "net1080 %s-%s ttl 0x%x this = %d, other = %d",
-			dev->udev->bus->bus_name, dev->udev->devpath,
-			ttl, TTL_THIS (ttl), TTL_OTHER (ttl));
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int net1080_reset (struct usbnet *dev)
-{
-	u16		usbctl, status, ttl;
-	u16		*vp = kmalloc (sizeof (u16), GFP_KERNEL);
-	int		retval;
-
-	if (!vp)
-		return -ENOMEM;
-
-	// nc_dump_registers (dev);
-
-	if ((retval = nc_register_read (dev, REG_STATUS, vp)) < 0) {
-		dbg ("can't read %s-%s status: %d",
-			dev->udev->bus->bus_name, dev->udev->devpath, retval);
-		goto done;
-	}
-	status = *vp;
-	nc_dump_status (dev, status);
-
-	if ((retval = nc_register_read (dev, REG_USBCTL, vp)) < 0) {
-		dbg ("can't read USBCTL, %d", retval);
-		goto done;
-	}
-	usbctl = *vp;
-	nc_dump_usbctl (dev, usbctl);
-
-	nc_register_write (dev, REG_USBCTL,
-			USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER);
-
-	if ((retval = nc_register_read (dev, REG_TTL, vp)) < 0) {
-		dbg ("can't read TTL, %d", retval);
-		goto done;
-	}
-	ttl = *vp;
-	// nc_dump_ttl (dev, ttl);
-
-	nc_register_write (dev, REG_TTL,
-			MK_TTL (NC_READ_TTL_MS, TTL_OTHER (ttl)) );
-	dbg ("%s: assigned TTL, %d ms", dev->net->name, NC_READ_TTL_MS);
-
-	if (netif_msg_link (dev))
-		devinfo (dev, "port %c, peer %sconnected",
-			(status & STATUS_PORT_A) ? 'A' : 'B',
-			(status & STATUS_CONN_OTHER) ? "" : "dis"
-			);
-	retval = 0;
-
-done:
-	kfree (vp);
-	return retval;
-}
-
-static int net1080_check_connect (struct usbnet *dev)
-{
-	int			retval;
-	u16			status;
-	u16			*vp = kmalloc (sizeof (u16), GFP_KERNEL);
-
-	if (!vp)
-		return -ENOMEM;
-	retval = nc_register_read (dev, REG_STATUS, vp);
-	status = *vp;
-	kfree (vp);
-	if (retval != 0) {
-		dbg ("%s net1080_check_conn read - %d", dev->net->name, retval);
-		return retval;
-	}
-	if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER)
-		return -ENOLINK;
-	return 0;
-}
-
-static void nc_flush_complete (struct urb *urb, struct pt_regs *regs)
-{
-	kfree (urb->context);
-	usb_free_urb(urb);
-}
-
-static void nc_ensure_sync (struct usbnet *dev)
-{
-	dev->frame_errors++;
-	if (dev->frame_errors > 5) {
-		struct urb		*urb;
-		struct usb_ctrlrequest	*req;
-		int			status;
-
-		/* Send a flush */
-		urb = usb_alloc_urb (0, SLAB_ATOMIC);
-		if (!urb)
-			return;
-
-		req = kmalloc (sizeof *req, GFP_ATOMIC);
-		if (!req) {
-			usb_free_urb (urb);
-			return;
-		}
-
-		req->bRequestType = USB_DIR_OUT
-			| USB_TYPE_VENDOR
-			| USB_RECIP_DEVICE;
-		req->bRequest = REQUEST_REGISTER;
-		req->wValue = cpu_to_le16 (USBCTL_FLUSH_THIS
-				| USBCTL_FLUSH_OTHER);
-		req->wIndex = cpu_to_le16 (REG_USBCTL);
-		req->wLength = cpu_to_le16 (0);
-
-		/* queue an async control request, we don't need
-		 * to do anything when it finishes except clean up.
-		 */
-		usb_fill_control_urb (urb, dev->udev,
-			usb_sndctrlpipe (dev->udev, 0),
-			(unsigned char *) req,
-			NULL, 0,
-			nc_flush_complete, req);
-		status = usb_submit_urb (urb, GFP_ATOMIC);
-		if (status) {
-			kfree (req);
-			usb_free_urb (urb);
-			return;
-		}
-
-		if (netif_msg_rx_err (dev))
-			devdbg (dev, "flush net1080; too many framing errors");
-		dev->frame_errors = 0;
-	}
-}
-
-static int net1080_rx_fixup (struct usbnet *dev, struct sk_buff *skb)
-{
-	struct nc_header	*header;
-	struct net_device	*net = dev->net;
-	struct nc_trailer	*trailer;
-	u16			hdr_len, packet_len;
-
-	if (!(skb->len & 0x01)) {
-		dev->stats.rx_frame_errors++;
-		dbg ("rx framesize %d range %d..%d mtu %d", skb->len,
-			net->hard_header_len, dev->hard_mtu, net->mtu);
-		nc_ensure_sync (dev);
-		return 0;
-	}
-
-	header = (struct nc_header *) skb->data;
-	hdr_len = le16_to_cpup (&header->hdr_len);
-	packet_len = le16_to_cpup (&header->packet_len);
-	if (FRAMED_SIZE (packet_len) > NC_MAX_PACKET) {
-		dev->stats.rx_frame_errors++;
-		dbg ("packet too big, %d", packet_len);
-		nc_ensure_sync (dev);
-		return 0;
-	} else if (hdr_len < MIN_HEADER) {
-		dev->stats.rx_frame_errors++;
-		dbg ("header too short, %d", hdr_len);
-		nc_ensure_sync (dev);
-		return 0;
-	} else if (hdr_len > MIN_HEADER) {
-		// out of band data for us?
-		dbg ("header OOB, %d bytes", hdr_len - MIN_HEADER);
-		nc_ensure_sync (dev);
-		// switch (vendor/product ids) { ... }
-	}
-	skb_pull (skb, hdr_len);
-
-	trailer = (struct nc_trailer *)
-		(skb->data + skb->len - sizeof *trailer);
-	skb_trim (skb, skb->len - sizeof *trailer);
-
-	if ((packet_len & 0x01) == 0) {
-		if (skb->data [packet_len] != PAD_BYTE) {
-			dev->stats.rx_frame_errors++;
-			dbg ("bad pad");
-			return 0;
-		}
-		skb_trim (skb, skb->len - 1);
-	}
-	if (skb->len != packet_len) {
-		dev->stats.rx_frame_errors++;
-		dbg ("bad packet len %d (expected %d)",
-			skb->len, packet_len);
-		nc_ensure_sync (dev);
-		return 0;
-	}
-	if (header->packet_id != get_unaligned (&trailer->packet_id)) {
-		dev->stats.rx_fifo_errors++;
-		dbg ("(2+ dropped) rx packet_id mismatch 0x%x 0x%x",
-			le16_to_cpu (header->packet_id),
-			le16_to_cpu (trailer->packet_id));
-		return 0;
-	}
-#if 0
-	devdbg (dev, "frame <rx h %d p %d id %d", header->hdr_len,
-		header->packet_len, header->packet_id);
-#endif
-	dev->frame_errors = 0;
-	return 1;
-}
-
-static struct sk_buff *
-net1080_tx_fixup (struct usbnet *dev, struct sk_buff *skb, unsigned flags)
-{
-	int			padlen;
-	struct sk_buff		*skb2;
-
-	padlen = ((skb->len + sizeof (struct nc_header)
-			+ sizeof (struct nc_trailer)) & 0x01) ? 0 : 1;
-	if (!skb_cloned (skb)) {
-		int	headroom = skb_headroom (skb);
-		int	tailroom = skb_tailroom (skb);
-
-		if ((padlen + sizeof (struct nc_trailer)) <= tailroom
-			    && sizeof (struct nc_header) <= headroom)
-			/* There's enough head and tail room */
-			return skb;
-
-		if ((sizeof (struct nc_header) + padlen
-					+ sizeof (struct nc_trailer)) <
-				(headroom + tailroom)) {
-			/* There's enough total room, so just readjust */
-			skb->data = memmove (skb->head
-						+ sizeof (struct nc_header),
-					    skb->data, skb->len);
-			skb->tail = skb->data + skb->len;
-			return skb;
-		}
-	}
-
-	/* Create a new skb to use with the correct size */
-	skb2 = skb_copy_expand (skb,
-				sizeof (struct nc_header),
-				sizeof (struct nc_trailer) + padlen,
-				flags);
-	dev_kfree_skb_any (skb);
-	return skb2;
-}
-
-static int net1080_bind (struct usbnet *dev, struct usb_interface *intf)
-{
-	unsigned	extra = sizeof (struct nc_header)
-				+ 1
-				+ sizeof (struct nc_trailer);
-
-	dev->net->hard_header_len += extra;
-	dev->hard_mtu = NC_MAX_PACKET;
-	return 0;
-}
-
-static const struct driver_info	net1080_info = {
-	.description =	"NetChip TurboCONNECT",
-	.flags =	FLAG_FRAMING_NC,
-	.bind =		net1080_bind,
-	.reset =	net1080_reset,
-	.check_connect = net1080_check_connect,
-	.rx_fixup =	net1080_rx_fixup,
-	.tx_fixup =	net1080_tx_fixup,
-};
-
-#endif /* CONFIG_USB_NET1080 */
-
-
-
 #ifdef CONFIG_USB_PL2301
 #define	HAVE_HARDWARE
 
@@ -2479,10 +1949,6 @@
 	struct skb_data		*entry;
 	struct driver_info	*info = dev->driver_info;
 	unsigned long		flags;
-#ifdef	CONFIG_USB_NET1080
-	struct nc_header	*header = NULL;
-	struct nc_trailer	*trailer = NULL;
-#endif	/* CONFIG_USB_NET1080 */
 
 	// some devices want funky USB-level framing, for
 	// win32 driver (usually) and/or hardware quirks
@@ -2508,21 +1974,6 @@
 	entry->state = tx_start;
 	entry->length = length;
 
-	// FIXME: reorganize a bit, so that fixup() fills out NetChip
-	// framing too. (Packet ID update needs the spinlock...)
-	// [ BETTER:  we already own net->xmit_lock, that's enough ]
-
-#ifdef	CONFIG_USB_NET1080
-	if (info->flags & FLAG_FRAMING_NC) {
-		header = (struct nc_header *) skb_push (skb, sizeof *header);
-		header->hdr_len = cpu_to_le16 (sizeof (*header));
-		header->packet_len = cpu_to_le16 (length);
-		if (!((skb->len + sizeof *trailer) & 0x01))
-			*skb_put (skb, 1) = PAD_BYTE;
-		trailer = (struct nc_trailer *) skb_put (skb, sizeof *trailer);
-	}
-#endif	/* CONFIG_USB_NET1080 */
-
 	usb_fill_bulk_urb (urb, dev->udev, dev->out,
 			skb->data, skb->len, tx_complete, skb);
 
@@ -2537,18 +1988,6 @@
 
 	spin_lock_irqsave (&dev->txq.lock, flags);
 
-#ifdef	CONFIG_USB_NET1080
-	if (info->flags & FLAG_FRAMING_NC) {
-		header->packet_id = cpu_to_le16 ((u16)dev->xid++);
-		put_unaligned (header->packet_id, &trailer->packet_id);
-#if 0
-		devdbg (dev, "frame >tx h %d p %d id %d",
-			header->hdr_len, header->packet_len,
-			header->packet_id);
-#endif
-	}
-#endif	/* CONFIG_USB_NET1080 */
-
 	switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
 	case -EPIPE:
 		netif_stop_queue (net);
@@ -2876,16 +2315,6 @@
 	 */
 #endif
 
-#ifdef	CONFIG_USB_NET1080
-{
-	USB_DEVICE (0x0525, 0x1080),	// NetChip ref design
-	.driver_info =	(unsigned long) &net1080_info,
-}, {
-	USB_DEVICE (0x06D0, 0x0622),	// Laplink Gold
-	.driver_info =	(unsigned long) &net1080_info,
-},
-#endif
-
 #ifdef CONFIG_USB_PL2301
 {
 	USB_DEVICE (0x067b, 0x0000),	// PL-2301
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gregkh-2.6/drivers/usb/net/net1080.c	2005-08-15 17:51:21.000000000 -0700
@@ -0,0 +1,618 @@
+/*
+ * Net1080 based USB host-to-host cables
+ * Copyright (C) 2000-2005 by David Brownell
+ *
+ * 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
+ */
+
+// #define	DEBUG			// error path messages, extra info
+// #define	VERBOSE			// more; success messages
+
+#include <linux/config.h>
+#ifdef	CONFIG_USB_DEBUG
+#   define DEBUG
+#endif
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/workqueue.h>
+#include <linux/mii.h>
+#include <linux/usb.h>
+
+#include <asm/unaligned.h>
+
+#include "usbnet.h"
+
+
+/*
+ * Netchip 1080 driver ... http://www.netchip.com
+ * Used in LapLink cables
+ */
+
+#define frame_errors	data[1]
+
+/*
+ * NetChip framing of ethernet packets, supporting additional error
+ * checks for links that may drop bulk packets from inside messages.
+ * Odd USB length == always short read for last usb packet.
+ *	- nc_header
+ *	- Ethernet header (14 bytes)
+ *	- payload
+ *	- (optional padding byte, if needed so length becomes odd)
+ *	- nc_trailer
+ *
+ * This framing is to be avoided for non-NetChip devices.
+ */
+
+struct nc_header {		// packed:
+	__le16	hdr_len;		// sizeof nc_header (LE, all)
+	__le16	packet_len;		// payload size (including ethhdr)
+	__le16	packet_id;		// detects dropped packets
+#define MIN_HEADER	6
+
+	// all else is optional, and must start with:
+	// u16	vendorId;		// from usb-if
+	// u16	productId;
+} __attribute__((__packed__));
+
+#define	PAD_BYTE	((unsigned char)0xAC)
+
+struct nc_trailer {
+	__le16	packet_id;
+} __attribute__((__packed__));
+
+// packets may use FLAG_FRAMING_NC and optional pad
+#define FRAMED_SIZE(mtu) (sizeof (struct nc_header) \
+				+ sizeof (struct ethhdr) \
+				+ (mtu) \
+				+ 1 \
+				+ sizeof (struct nc_trailer))
+
+#define MIN_FRAMED	FRAMED_SIZE(0)
+
+/* packets _could_ be up to 64KB... */
+#define NC_MAX_PACKET	32767
+
+
+/*
+ * Zero means no timeout; else, how long a 64 byte bulk packet may be queued
+ * before the hardware drops it.  If that's done, the driver will need to
+ * frame network packets to guard against the dropped USB packets.  The win32
+ * driver sets this for both sides of the link.
+ */
+#define	NC_READ_TTL_MS	((u8)255)	// ms
+
+/*
+ * We ignore most registers and EEPROM contents.
+ */
+#define	REG_USBCTL	((u8)0x04)
+#define REG_TTL		((u8)0x10)
+#define REG_STATUS	((u8)0x11)
+
+/*
+ * Vendor specific requests to read/write data
+ */
+#define	REQUEST_REGISTER	((u8)0x10)
+#define	REQUEST_EEPROM		((u8)0x11)
+
+static int
+nc_vendor_read(struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr)
+{
+	int status = usb_control_msg(dev->udev,
+		usb_rcvctrlpipe(dev->udev, 0),
+		req,
+		USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		0, regnum,
+		retval_ptr, sizeof *retval_ptr,
+		USB_CTRL_GET_TIMEOUT);
+	if (status > 0)
+		status = 0;
+	if (!status)
+		le16_to_cpus(retval_ptr);
+	return status;
+}
+
+static inline int
+nc_register_read(struct usbnet *dev, u8 regnum, u16 *retval_ptr)
+{
+	return nc_vendor_read(dev, REQUEST_REGISTER, regnum, retval_ptr);
+}
+
+// no retval ... can become async, usable in_interrupt()
+static void
+nc_vendor_write(struct usbnet *dev, u8 req, u8 regnum, u16 value)
+{
+	usb_control_msg(dev->udev,
+		usb_sndctrlpipe(dev->udev, 0),
+		req,
+		USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		value, regnum,
+		NULL, 0,			// data is in setup packet
+		USB_CTRL_SET_TIMEOUT);
+}
+
+static inline void
+nc_register_write(struct usbnet *dev, u8 regnum, u16 value)
+{
+	nc_vendor_write(dev, REQUEST_REGISTER, regnum, value);
+}
+
+
+#if 0
+static void nc_dump_registers(struct usbnet *dev)
+{
+	u8	reg;
+	u16	*vp = kmalloc(sizeof (u16));
+
+	if (!vp) {
+		dbg("no memory?");
+		return;
+	}
+
+	dbg("%s registers:", dev->net->name);
+	for (reg = 0; reg < 0x20; reg++) {
+		int retval;
+
+		// reading some registers is trouble
+		if (reg >= 0x08 && reg <= 0xf)
+			continue;
+		if (reg >= 0x12 && reg <= 0x1e)
+			continue;
+
+		retval = nc_register_read(dev, reg, vp);
+		if (retval < 0)
+			dbg("%s reg [0x%x] ==> error %d",
+				dev->net->name, reg, retval);
+		else
+			dbg("%s reg [0x%x] = 0x%x",
+				dev->net->name, reg, *vp);
+	}
+	kfree(vp);
+}
+#endif
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Control register
+ */
+
+#define	USBCTL_WRITABLE_MASK	0x1f0f
+// bits 15-13 reserved, r/o
+#define	USBCTL_ENABLE_LANG	(1 << 12)
+#define	USBCTL_ENABLE_MFGR	(1 << 11)
+#define	USBCTL_ENABLE_PROD	(1 << 10)
+#define	USBCTL_ENABLE_SERIAL	(1 << 9)
+#define	USBCTL_ENABLE_DEFAULTS	(1 << 8)
+// bits 7-4 reserved, r/o
+#define	USBCTL_FLUSH_OTHER	(1 << 3)
+#define	USBCTL_FLUSH_THIS	(1 << 2)
+#define	USBCTL_DISCONN_OTHER	(1 << 1)
+#define	USBCTL_DISCONN_THIS	(1 << 0)
+
+static inline void nc_dump_usbctl(struct usbnet *dev, u16 usbctl)
+{
+	if (!netif_msg_link(dev))
+		return;
+	devdbg(dev, "net1080 %s-%s usbctl 0x%x:%s%s%s%s%s;"
+			" this%s%s;"
+			" other%s%s; r/o 0x%x",
+		dev->udev->bus->bus_name, dev->udev->devpath,
+		usbctl,
+		(usbctl & USBCTL_ENABLE_LANG) ? " lang" : "",
+		(usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "",
+		(usbctl & USBCTL_ENABLE_PROD) ? " prod" : "",
+		(usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "",
+		(usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "",
+
+		(usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "",
+		(usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "",
+		(usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "",
+		(usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "",
+		usbctl & ~USBCTL_WRITABLE_MASK
+		);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Status register
+ */
+
+#define	STATUS_PORT_A		(1 << 15)
+
+#define	STATUS_CONN_OTHER	(1 << 14)
+#define	STATUS_SUSPEND_OTHER	(1 << 13)
+#define	STATUS_MAILBOX_OTHER	(1 << 12)
+#define	STATUS_PACKETS_OTHER(n)	(((n) >> 8) && 0x03)
+
+#define	STATUS_CONN_THIS	(1 << 6)
+#define	STATUS_SUSPEND_THIS	(1 << 5)
+#define	STATUS_MAILBOX_THIS	(1 << 4)
+#define	STATUS_PACKETS_THIS(n)	(((n) >> 0) && 0x03)
+
+#define	STATUS_UNSPEC_MASK	0x0c8c
+#define	STATUS_NOISE_MASK 	((u16)~(0x0303|STATUS_UNSPEC_MASK))
+
+
+static inline void nc_dump_status(struct usbnet *dev, u16 status)
+{
+	if (!netif_msg_link(dev))
+		return;
+	devdbg(dev, "net1080 %s-%s status 0x%x:"
+			" this (%c) PKT=%d%s%s%s;"
+			" other PKT=%d%s%s%s; unspec 0x%x",
+		dev->udev->bus->bus_name, dev->udev->devpath,
+		status,
+
+		// XXX the packet counts don't seem right
+		// (1 at reset, not 0); maybe UNSPEC too
+
+		(status & STATUS_PORT_A) ? 'A' : 'B',
+		STATUS_PACKETS_THIS(status),
+		(status & STATUS_CONN_THIS) ? " CON" : "",
+		(status & STATUS_SUSPEND_THIS) ? " SUS" : "",
+		(status & STATUS_MAILBOX_THIS) ? " MBOX" : "",
+
+		STATUS_PACKETS_OTHER(status),
+		(status & STATUS_CONN_OTHER) ? " CON" : "",
+		(status & STATUS_SUSPEND_OTHER) ? " SUS" : "",
+		(status & STATUS_MAILBOX_OTHER) ? " MBOX" : "",
+
+		status & STATUS_UNSPEC_MASK
+		);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * TTL register
+ */
+
+#define	TTL_THIS(ttl)	(0x00ff & ttl)
+#define	TTL_OTHER(ttl)	(0x00ff & (ttl >> 8))
+#define MK_TTL(this,other)	((u16)(((other)<<8)|(0x00ff&(this))))
+
+static inline void nc_dump_ttl(struct usbnet *dev, u16 ttl)
+{
+	if (netif_msg_link(dev))
+		devdbg(dev, "net1080 %s-%s ttl 0x%x this = %d, other = %d",
+			dev->udev->bus->bus_name, dev->udev->devpath,
+			ttl, TTL_THIS(ttl), TTL_OTHER(ttl));
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int net1080_reset(struct usbnet *dev)
+{
+	u16		usbctl, status, ttl;
+	u16		*vp = kmalloc(sizeof (u16), GFP_KERNEL);
+	int		retval;
+
+	if (!vp)
+		return -ENOMEM;
+
+	// nc_dump_registers(dev);
+
+	if ((retval = nc_register_read(dev, REG_STATUS, vp)) < 0) {
+		dbg("can't read %s-%s status: %d",
+			dev->udev->bus->bus_name, dev->udev->devpath, retval);
+		goto done;
+	}
+	status = *vp;
+	nc_dump_status(dev, status);
+
+	if ((retval = nc_register_read(dev, REG_USBCTL, vp)) < 0) {
+		dbg("can't read USBCTL, %d", retval);
+		goto done;
+	}
+	usbctl = *vp;
+	nc_dump_usbctl(dev, usbctl);
+
+	nc_register_write(dev, REG_USBCTL,
+			USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER);
+
+	if ((retval = nc_register_read(dev, REG_TTL, vp)) < 0) {
+		dbg("can't read TTL, %d", retval);
+		goto done;
+	}
+	ttl = *vp;
+	// nc_dump_ttl(dev, ttl);
+
+	nc_register_write(dev, REG_TTL,
+			MK_TTL(NC_READ_TTL_MS, TTL_OTHER(ttl)) );
+	dbg("%s: assigned TTL, %d ms", dev->net->name, NC_READ_TTL_MS);
+
+	if (netif_msg_link(dev))
+		devinfo(dev, "port %c, peer %sconnected",
+			(status & STATUS_PORT_A) ? 'A' : 'B',
+			(status & STATUS_CONN_OTHER) ? "" : "dis"
+			);
+	retval = 0;
+
+done:
+	kfree(vp);
+	return retval;
+}
+
+static int net1080_check_connect(struct usbnet *dev)
+{
+	int			retval;
+	u16			status;
+	u16			*vp = kmalloc(sizeof (u16), GFP_KERNEL);
+
+	if (!vp)
+		return -ENOMEM;
+	retval = nc_register_read(dev, REG_STATUS, vp);
+	status = *vp;
+	kfree(vp);
+	if (retval != 0) {
+		dbg("%s net1080_check_conn read - %d", dev->net->name, retval);
+		return retval;
+	}
+	if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER)
+		return -ENOLINK;
+	return 0;
+}
+
+static void nc_flush_complete(struct urb *urb, struct pt_regs *regs)
+{
+	kfree(urb->context);
+	usb_free_urb(urb);
+}
+
+static void nc_ensure_sync(struct usbnet *dev)
+{
+	dev->frame_errors++;
+	if (dev->frame_errors > 5) {
+		struct urb		*urb;
+		struct usb_ctrlrequest	*req;
+		int			status;
+
+		/* Send a flush */
+		urb = usb_alloc_urb(0, SLAB_ATOMIC);
+		if (!urb)
+			return;
+
+		req = kmalloc(sizeof *req, GFP_ATOMIC);
+		if (!req) {
+			usb_free_urb(urb);
+			return;
+		}
+
+		req->bRequestType = USB_DIR_OUT
+			| USB_TYPE_VENDOR
+			| USB_RECIP_DEVICE;
+		req->bRequest = REQUEST_REGISTER;
+		req->wValue = cpu_to_le16(USBCTL_FLUSH_THIS
+				| USBCTL_FLUSH_OTHER);
+		req->wIndex = cpu_to_le16(REG_USBCTL);
+		req->wLength = cpu_to_le16(0);
+
+		/* queue an async control request, we don't need
+		 * to do anything when it finishes except clean up.
+		 */
+		usb_fill_control_urb(urb, dev->udev,
+			usb_sndctrlpipe(dev->udev, 0),
+			(unsigned char *) req,
+			NULL, 0,
+			nc_flush_complete, req);
+		status = usb_submit_urb(urb, GFP_ATOMIC);
+		if (status) {
+			kfree(req);
+			usb_free_urb(urb);
+			return;
+		}
+
+		if (netif_msg_rx_err(dev))
+			devdbg(dev, "flush net1080; too many framing errors");
+		dev->frame_errors = 0;
+	}
+}
+
+static int net1080_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
+{
+	struct nc_header	*header;
+	struct net_device	*net = dev->net;
+	struct nc_trailer	*trailer;
+	u16			hdr_len, packet_len;
+
+	if (!(skb->len & 0x01)) {
+		dev->stats.rx_frame_errors++;
+		dbg("rx framesize %d range %d..%d mtu %d", skb->len,
+			net->hard_header_len, dev->hard_mtu, net->mtu);
+		nc_ensure_sync(dev);
+		return 0;
+	}
+
+	header = (struct nc_header *) skb->data;
+	hdr_len = le16_to_cpup(&header->hdr_len);
+	packet_len = le16_to_cpup(&header->packet_len);
+	if (FRAMED_SIZE(packet_len) > NC_MAX_PACKET) {
+		dev->stats.rx_frame_errors++;
+		dbg("packet too big, %d", packet_len);
+		nc_ensure_sync(dev);
+		return 0;
+	} else if (hdr_len < MIN_HEADER) {
+		dev->stats.rx_frame_errors++;
+		dbg("header too short, %d", hdr_len);
+		nc_ensure_sync(dev);
+		return 0;
+	} else if (hdr_len > MIN_HEADER) {
+		// out of band data for us?
+		dbg("header OOB, %d bytes", hdr_len - MIN_HEADER);
+		nc_ensure_sync(dev);
+		// switch (vendor/product ids) { ... }
+	}
+	skb_pull(skb, hdr_len);
+
+	trailer = (struct nc_trailer *)
+		(skb->data + skb->len - sizeof *trailer);
+	skb_trim(skb, skb->len - sizeof *trailer);
+
+	if ((packet_len & 0x01) == 0) {
+		if (skb->data [packet_len] != PAD_BYTE) {
+			dev->stats.rx_frame_errors++;
+			dbg("bad pad");
+			return 0;
+		}
+		skb_trim(skb, skb->len - 1);
+	}
+	if (skb->len != packet_len) {
+		dev->stats.rx_frame_errors++;
+		dbg("bad packet len %d (expected %d)",
+			skb->len, packet_len);
+		nc_ensure_sync(dev);
+		return 0;
+	}
+	if (header->packet_id != get_unaligned(&trailer->packet_id)) {
+		dev->stats.rx_fifo_errors++;
+		dbg("(2+ dropped) rx packet_id mismatch 0x%x 0x%x",
+			le16_to_cpu(header->packet_id),
+			le16_to_cpu(trailer->packet_id));
+		return 0;
+	}
+#if 0
+	devdbg(dev, "frame <rx h %d p %d id %d", header->hdr_len,
+		header->packet_len, header->packet_id);
+#endif
+	dev->frame_errors = 0;
+	return 1;
+}
+
+static struct sk_buff *
+net1080_tx_fixup(struct usbnet *dev, struct sk_buff *skb, unsigned flags)
+{
+	int			padlen;
+	struct sk_buff		*skb2;
+	struct nc_header	*header = NULL;
+	struct nc_trailer	*trailer = NULL;
+	int			len = skb->len;
+
+	padlen = ((len + sizeof (struct nc_header)
+			+ sizeof (struct nc_trailer)) & 0x01) ? 0 : 1;
+	if (!skb_cloned(skb)) {
+		int	headroom = skb_headroom(skb);
+		int	tailroom = skb_tailroom(skb);
+
+		if ((padlen + sizeof (struct nc_trailer)) <= tailroom
+			    && sizeof (struct nc_header) <= headroom)
+			/* There's enough head and tail room */
+			goto encapsulate;
+
+		if ((sizeof (struct nc_header) + padlen
+					+ sizeof (struct nc_trailer)) <
+				(headroom + tailroom)) {
+			/* There's enough total room, so just readjust */
+			skb->data = memmove(skb->head
+						+ sizeof (struct nc_header),
+					    skb->data, skb->len);
+			skb->tail = skb->data + len;
+			goto encapsulate;
+		}
+	}
+
+	/* Create a new skb to use with the correct size */
+	skb2 = skb_copy_expand(skb,
+				sizeof (struct nc_header),
+				sizeof (struct nc_trailer) + padlen,
+				flags);
+	dev_kfree_skb_any(skb);
+	if (!skb2)
+		return skb2;
+	skb = skb2;
+
+encapsulate:
+	/* header first */
+	header = (struct nc_header *) skb_push(skb, sizeof *header);
+	header->hdr_len = cpu_to_le16(sizeof (*header));
+	header->packet_len = cpu_to_le16(len);
+	header->packet_id = cpu_to_le16((u16)dev->xid++);
+
+	/* maybe pad; then trailer */
+	if (!((skb->len + sizeof *trailer) & 0x01))
+		*skb_put(skb, 1) = PAD_BYTE;
+	trailer = (struct nc_trailer *) skb_put(skb, sizeof *trailer);
+	put_unaligned(header->packet_id, &trailer->packet_id);
+#if 0
+	devdbg(dev, "frame >tx h %d p %d id %d",
+		header->hdr_len, header->packet_len,
+		header->packet_id);
+#endif
+	return skb;
+}
+
+static int net1080_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+	unsigned	extra = sizeof (struct nc_header)
+				+ 1
+				+ sizeof (struct nc_trailer);
+
+	dev->net->hard_header_len += extra;
+	dev->hard_mtu = NC_MAX_PACKET;
+	return 0;
+}
+
+static const struct driver_info	net1080_info = {
+	.description =	"NetChip TurboCONNECT",
+	.flags =	FLAG_FRAMING_NC,
+	.bind =		net1080_bind,
+	.reset =	net1080_reset,
+	.check_connect = net1080_check_connect,
+	.rx_fixup =	net1080_rx_fixup,
+	.tx_fixup =	net1080_tx_fixup,
+};
+
+static const struct usb_device_id	products [] = {
+{
+	USB_DEVICE(0x0525, 0x1080),	// NetChip ref design
+	.driver_info =	(unsigned long) &net1080_info,
+}, {
+	USB_DEVICE(0x06D0, 0x0622),	// Laplink Gold
+	.driver_info =	(unsigned long) &net1080_info,
+},
+	{ },		// END
+};
+MODULE_DEVICE_TABLE(usb, products);
+
+static struct usb_driver net1080_driver = {
+	.owner =	THIS_MODULE,
+	.name =		"net1080",
+	.id_table =	products,
+	.probe =	usbnet_probe,
+	.disconnect =	usbnet_disconnect,
+	.suspend =	usbnet_suspend,
+	.resume =	usbnet_resume,
+};
+
+static int __init net1080_init(void)
+{
+ 	return usb_register(&net1080_driver);
+}
+module_init(net1080_init);
+
+static void __exit net1080_exit(void)
+{
+ 	usb_deregister(&net1080_driver);
+}
+module_exit(net1080_exit);
+
+MODULE_AUTHOR("David Brownell");
+MODULE_DESCRIPTION("NetChip 1080 based USB Host-to-Host Links");
+MODULE_LICENSE("GPL");