plip: Move the PLIP driver

Move the Parallel Line Internet Protocol (PLIP) driver into
drivers/net/plip/ and make the necessary Kconfig and Makefile changes.

CC: Niibe Yutaka <gniibe@mri.co.jp>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>

1 files changed, 0 insertions, 1403 deletions

diff --git a/drivers/net/plip.c b/drivers/net/plip.c
deleted file mode 100644
index a9e9ca8..0000000
--- a/drivers/net/plip.c
+++ /dev/null
@@ -1,1403 +0,0 @@
-/* $Id: plip.c,v 1.3.6.2 1997/04/16 15:07:56 phil Exp $ */
-/* PLIP: A parallel port "network" driver for Linux. */
-/* This driver is for parallel port with 5-bit cable (LapLink (R) cable). */
-/*
- * Authors:	Donald Becker <becker@scyld.com>
- *		Tommy Thorn <thorn@daimi.aau.dk>
- *		Tanabe Hiroyasu <hiro@sanpo.t.u-tokyo.ac.jp>
- *		Alan Cox <gw4pts@gw4pts.ampr.org>
- *		Peter Bauer <100136.3530@compuserve.com>
- *		Niibe Yutaka <gniibe@mri.co.jp>
- *		Nimrod Zimerman <zimerman@mailandnews.com>
- *
- * Enhancements:
- *		Modularization and ifreq/ifmap support by Alan Cox.
- *		Rewritten by Niibe Yutaka.
- *		parport-sharing awareness code by Philip Blundell.
- *		SMP locking by Niibe Yutaka.
- *		Support for parallel ports with no IRQ (poll mode),
- *		Modifications to use the parallel port API
- *		by Nimrod Zimerman.
- *
- * Fixes:
- *		Niibe Yutaka
- *		  - Module initialization.
- *		  - MTU fix.
- *		  - Make sure other end is OK, before sending a packet.
- *		  - Fix immediate timer problem.
- *
- *		Al Viro
- *		  - Changed {enable,disable}_irq handling to make it work
- *		    with new ("stack") semantics.
- *
- *		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.
- */
-
-/*
- * Original version and the name 'PLIP' from Donald Becker <becker@scyld.com>
- * inspired by Russ Nelson's parallel port packet driver.
- *
- * NOTE:
- *     Tanabe Hiroyasu had changed the protocol, and it was in Linux v1.0.
- *     Because of the necessity to communicate to DOS machines with the
- *     Crynwr packet driver, Peter Bauer changed the protocol again
- *     back to original protocol.
- *
- *     This version follows original PLIP protocol.
- *     So, this PLIP can't communicate the PLIP of Linux v1.0.
- */
-
-/*
- *     To use with DOS box, please do (Turn on ARP switch):
- *	# ifconfig plip[0-2] arp
- */
-static const char version[] = "NET3 PLIP version 2.4-parport gniibe@mri.co.jp\n";
-
-/*
-  Sources:
-	Ideas and protocols came from Russ Nelson's <nelson@crynwr.com>
-	"parallel.asm" parallel port packet driver.
-
-  The "Crynwr" parallel port standard specifies the following protocol:
-    Trigger by sending nibble '0x8' (this causes interrupt on other end)
-    count-low octet
-    count-high octet
-    ... data octets
-    checksum octet
-  Each octet is sent as <wait for rx. '0x1?'> <send 0x10+(octet&0x0F)>
-			<wait for rx. '0x0?'> <send 0x00+((octet>>4)&0x0F)>
-
-  The packet is encapsulated as if it were ethernet.
-
-  The cable used is a de facto standard parallel null cable -- sold as
-  a "LapLink" cable by various places.  You'll need a 12-conductor cable to
-  make one yourself.  The wiring is:
-    SLCTIN	17 - 17
-    GROUND	25 - 25
-    D0->ERROR	2 - 15		15 - 2
-    D1->SLCT	3 - 13		13 - 3
-    D2->PAPOUT	4 - 12		12 - 4
-    D3->ACK	5 - 10		10 - 5
-    D4->BUSY	6 - 11		11 - 6
-  Do not connect the other pins.  They are
-    D5,D6,D7 are 7,8,9
-    STROBE is 1, FEED is 14, INIT is 16
-    extra grounds are 18,19,20,21,22,23,24
-*/
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/fcntl.h>
-#include <linux/interrupt.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/if_ether.h>
-#include <linux/in.h>
-#include <linux/errno.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/inetdevice.h>
-#include <linux/skbuff.h>
-#include <linux/if_plip.h>
-#include <linux/workqueue.h>
-#include <linux/spinlock.h>
-#include <linux/completion.h>
-#include <linux/parport.h>
-#include <linux/bitops.h>
-
-#include <net/neighbour.h>
-
-#include <asm/system.h>
-#include <asm/irq.h>
-#include <asm/byteorder.h>
-
-/* Maximum number of devices to support. */
-#define PLIP_MAX  8
-
-/* Use 0 for production, 1 for verification, >2 for debug */
-#ifndef NET_DEBUG
-#define NET_DEBUG 1
-#endif
-static const unsigned int net_debug = NET_DEBUG;
-
-#define ENABLE(irq)  if (irq != -1) enable_irq(irq)
-#define DISABLE(irq) if (irq != -1) disable_irq(irq)
-
-/* In micro second */
-#define PLIP_DELAY_UNIT		   1
-
-/* Connection time out = PLIP_TRIGGER_WAIT * PLIP_DELAY_UNIT usec */
-#define PLIP_TRIGGER_WAIT	 500
-
-/* Nibble time out = PLIP_NIBBLE_WAIT * PLIP_DELAY_UNIT usec */
-#define PLIP_NIBBLE_WAIT        3000
-
-/* Bottom halves */
-static void plip_kick_bh(struct work_struct *work);
-static void plip_bh(struct work_struct *work);
-static void plip_timer_bh(struct work_struct *work);
-
-/* Interrupt handler */
-static void plip_interrupt(void *dev_id);
-
-/* Functions for DEV methods */
-static int plip_tx_packet(struct sk_buff *skb, struct net_device *dev);
-static int plip_hard_header(struct sk_buff *skb, struct net_device *dev,
-                            unsigned short type, const void *daddr,
-			    const void *saddr, unsigned len);
-static int plip_hard_header_cache(const struct neighbour *neigh,
-                                  struct hh_cache *hh, __be16 type);
-static int plip_open(struct net_device *dev);
-static int plip_close(struct net_device *dev);
-static int plip_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
-static int plip_preempt(void *handle);
-static void plip_wakeup(void *handle);
-
-enum plip_connection_state {
-	PLIP_CN_NONE=0,
-	PLIP_CN_RECEIVE,
-	PLIP_CN_SEND,
-	PLIP_CN_CLOSING,
-	PLIP_CN_ERROR
-};
-
-enum plip_packet_state {
-	PLIP_PK_DONE=0,
-	PLIP_PK_TRIGGER,
-	PLIP_PK_LENGTH_LSB,
-	PLIP_PK_LENGTH_MSB,
-	PLIP_PK_DATA,
-	PLIP_PK_CHECKSUM
-};
-
-enum plip_nibble_state {
-	PLIP_NB_BEGIN,
-	PLIP_NB_1,
-	PLIP_NB_2,
-};
-
-struct plip_local {
-	enum plip_packet_state state;
-	enum plip_nibble_state nibble;
-	union {
-		struct {
-#if defined(__LITTLE_ENDIAN)
-			unsigned char lsb;
-			unsigned char msb;
-#elif defined(__BIG_ENDIAN)
-			unsigned char msb;
-			unsigned char lsb;
-#else
-#error	"Please fix the endianness defines in <asm/byteorder.h>"
-#endif
-		} b;
-		unsigned short h;
-	} length;
-	unsigned short byte;
-	unsigned char  checksum;
-	unsigned char  data;
-	struct sk_buff *skb;
-};
-
-struct net_local {
-	struct net_device *dev;
-	struct work_struct immediate;
-	struct delayed_work deferred;
-	struct delayed_work timer;
-	struct plip_local snd_data;
-	struct plip_local rcv_data;
-	struct pardevice *pardev;
-	unsigned long  trigger;
-	unsigned long  nibble;
-	enum plip_connection_state connection;
-	unsigned short timeout_count;
-	int is_deferred;
-	int port_owner;
-	int should_relinquish;
-	spinlock_t lock;
-	atomic_t kill_timer;
-	struct completion killed_timer_cmp;
-};
-
-static inline void enable_parport_interrupts (struct net_device *dev)
-{
-	if (dev->irq != -1)
-	{
-		struct parport *port =
-		   ((struct net_local *)netdev_priv(dev))->pardev->port;
-		port->ops->enable_irq (port);
-	}
-}
-
-static inline void disable_parport_interrupts (struct net_device *dev)
-{
-	if (dev->irq != -1)
-	{
-		struct parport *port =
-		   ((struct net_local *)netdev_priv(dev))->pardev->port;
-		port->ops->disable_irq (port);
-	}
-}
-
-static inline void write_data (struct net_device *dev, unsigned char data)
-{
-	struct parport *port =
-	   ((struct net_local *)netdev_priv(dev))->pardev->port;
-
-	port->ops->write_data (port, data);
-}
-
-static inline unsigned char read_status (struct net_device *dev)
-{
-	struct parport *port =
-	   ((struct net_local *)netdev_priv(dev))->pardev->port;
-
-	return port->ops->read_status (port);
-}
-
-static const struct header_ops plip_header_ops = {
-	.create	= plip_hard_header,
-	.cache  = plip_hard_header_cache,
-};
-
-static const struct net_device_ops plip_netdev_ops = {
-	.ndo_open		 = plip_open,
-	.ndo_stop		 = plip_close,
-	.ndo_start_xmit		 = plip_tx_packet,
-	.ndo_do_ioctl		 = plip_ioctl,
-	.ndo_change_mtu		 = eth_change_mtu,
-	.ndo_set_mac_address	 = eth_mac_addr,
-	.ndo_validate_addr	 = eth_validate_addr,
-};
-
-/* Entry point of PLIP driver.
-   Probe the hardware, and register/initialize the driver.
-
-   PLIP is rather weird, because of the way it interacts with the parport
-   system.  It is _not_ initialised from Space.c.  Instead, plip_init()
-   is called, and that function makes up a "struct net_device" for each port, and
-   then calls us here.
-
-   */
-static void
-plip_init_netdev(struct net_device *dev)
-{
-	struct net_local *nl = netdev_priv(dev);
-
-	/* Then, override parts of it */
-	dev->tx_queue_len 	 = 10;
-	dev->flags	         = IFF_POINTOPOINT|IFF_NOARP;
-	memset(dev->dev_addr, 0xfc, ETH_ALEN);
-
-	dev->netdev_ops		 = &plip_netdev_ops;
-	dev->header_ops          = &plip_header_ops;
-
-
-	nl->port_owner = 0;
-
-	/* Initialize constants */
-	nl->trigger	= PLIP_TRIGGER_WAIT;
-	nl->nibble	= PLIP_NIBBLE_WAIT;
-
-	/* Initialize task queue structures */
-	INIT_WORK(&nl->immediate, plip_bh);
-	INIT_DELAYED_WORK(&nl->deferred, plip_kick_bh);
-
-	if (dev->irq == -1)
-		INIT_DELAYED_WORK(&nl->timer, plip_timer_bh);
-
-	spin_lock_init(&nl->lock);
-}
-
-/* Bottom half handler for the delayed request.
-   This routine is kicked by do_timer().
-   Request `plip_bh' to be invoked. */
-static void
-plip_kick_bh(struct work_struct *work)
-{
-	struct net_local *nl =
-		container_of(work, struct net_local, deferred.work);
-
-	if (nl->is_deferred)
-		schedule_work(&nl->immediate);
-}
-
-/* Forward declarations of internal routines */
-static int plip_none(struct net_device *, struct net_local *,
-		     struct plip_local *, struct plip_local *);
-static int plip_receive_packet(struct net_device *, struct net_local *,
-			       struct plip_local *, struct plip_local *);
-static int plip_send_packet(struct net_device *, struct net_local *,
-			    struct plip_local *, struct plip_local *);
-static int plip_connection_close(struct net_device *, struct net_local *,
-				 struct plip_local *, struct plip_local *);
-static int plip_error(struct net_device *, struct net_local *,
-		      struct plip_local *, struct plip_local *);
-static int plip_bh_timeout_error(struct net_device *dev, struct net_local *nl,
-				 struct plip_local *snd,
-				 struct plip_local *rcv,
-				 int error);
-
-#define OK        0
-#define TIMEOUT   1
-#define ERROR     2
-#define HS_TIMEOUT	3
-
-typedef int (*plip_func)(struct net_device *dev, struct net_local *nl,
-			 struct plip_local *snd, struct plip_local *rcv);
-
-static const plip_func connection_state_table[] =
-{
-	plip_none,
-	plip_receive_packet,
-	plip_send_packet,
-	plip_connection_close,
-	plip_error
-};
-
-/* Bottom half handler of PLIP. */
-static void
-plip_bh(struct work_struct *work)
-{
-	struct net_local *nl = container_of(work, struct net_local, immediate);
-	struct plip_local *snd = &nl->snd_data;
-	struct plip_local *rcv = &nl->rcv_data;
-	plip_func f;
-	int r;
-
-	nl->is_deferred = 0;
-	f = connection_state_table[nl->connection];
-	if ((r = (*f)(nl->dev, nl, snd, rcv)) != OK &&
-	    (r = plip_bh_timeout_error(nl->dev, nl, snd, rcv, r)) != OK) {
-		nl->is_deferred = 1;
-		schedule_delayed_work(&nl->deferred, 1);
-	}
-}
-
-static void
-plip_timer_bh(struct work_struct *work)
-{
-	struct net_local *nl =
-		container_of(work, struct net_local, timer.work);
-
-	if (!(atomic_read (&nl->kill_timer))) {
-		plip_interrupt (nl->dev);
-
-		schedule_delayed_work(&nl->timer, 1);
-	}
-	else {
-		complete(&nl->killed_timer_cmp);
-	}
-}
-
-static int
-plip_bh_timeout_error(struct net_device *dev, struct net_local *nl,
-		      struct plip_local *snd, struct plip_local *rcv,
-		      int error)
-{
-	unsigned char c0;
-	/*
-	 * This is tricky. If we got here from the beginning of send (either
-	 * with ERROR or HS_TIMEOUT) we have IRQ enabled. Otherwise it's
-	 * already disabled. With the old variant of {enable,disable}_irq()
-	 * extra disable_irq() was a no-op. Now it became mortal - it's
-	 * unbalanced and thus we'll never re-enable IRQ (until rmmod plip,
-	 * that is). So we have to treat HS_TIMEOUT and ERROR from send
-	 * in a special way.
-	 */
-
-	spin_lock_irq(&nl->lock);
-	if (nl->connection == PLIP_CN_SEND) {
-
-		if (error != ERROR) { /* Timeout */
-			nl->timeout_count++;
-			if ((error == HS_TIMEOUT && nl->timeout_count <= 10) ||
-			    nl->timeout_count <= 3) {
-				spin_unlock_irq(&nl->lock);
-				/* Try again later */
-				return TIMEOUT;
-			}
-			c0 = read_status(dev);
-			printk(KERN_WARNING "%s: transmit timeout(%d,%02x)\n",
-			       dev->name, snd->state, c0);
-		} else
-			error = HS_TIMEOUT;
-		dev->stats.tx_errors++;
-		dev->stats.tx_aborted_errors++;
-	} else if (nl->connection == PLIP_CN_RECEIVE) {
-		if (rcv->state == PLIP_PK_TRIGGER) {
-			/* Transmission was interrupted. */
-			spin_unlock_irq(&nl->lock);
-			return OK;
-		}
-		if (error != ERROR) { /* Timeout */
-			if (++nl->timeout_count <= 3) {
-				spin_unlock_irq(&nl->lock);
-				/* Try again later */
-				return TIMEOUT;
-			}
-			c0 = read_status(dev);
-			printk(KERN_WARNING "%s: receive timeout(%d,%02x)\n",
-			       dev->name, rcv->state, c0);
-		}
-		dev->stats.rx_dropped++;
-	}
-	rcv->state = PLIP_PK_DONE;
-	if (rcv->skb) {
-		kfree_skb(rcv->skb);
-		rcv->skb = NULL;
-	}
-	snd->state = PLIP_PK_DONE;
-	if (snd->skb) {
-		dev_kfree_skb(snd->skb);
-		snd->skb = NULL;
-	}
-	spin_unlock_irq(&nl->lock);
-	if (error == HS_TIMEOUT) {
-		DISABLE(dev->irq);
-		synchronize_irq(dev->irq);
-	}
-	disable_parport_interrupts (dev);
-	netif_stop_queue (dev);
-	nl->connection = PLIP_CN_ERROR;
-	write_data (dev, 0x00);
-
-	return TIMEOUT;
-}
-
-static int
-plip_none(struct net_device *dev, struct net_local *nl,
-	  struct plip_local *snd, struct plip_local *rcv)
-{
-	return OK;
-}
-
-/* PLIP_RECEIVE --- receive a byte(two nibbles)
-   Returns OK on success, TIMEOUT on timeout */
-static inline int
-plip_receive(unsigned short nibble_timeout, struct net_device *dev,
-	     enum plip_nibble_state *ns_p, unsigned char *data_p)
-{
-	unsigned char c0, c1;
-	unsigned int cx;
-
-	switch (*ns_p) {
-	case PLIP_NB_BEGIN:
-		cx = nibble_timeout;
-		while (1) {
-			c0 = read_status(dev);
-			udelay(PLIP_DELAY_UNIT);
-			if ((c0 & 0x80) == 0) {
-				c1 = read_status(dev);
-				if (c0 == c1)
-					break;
-			}
-			if (--cx == 0)
-				return TIMEOUT;
-		}
-		*data_p = (c0 >> 3) & 0x0f;
-		write_data (dev, 0x10); /* send ACK */
-		*ns_p = PLIP_NB_1;
-
-	case PLIP_NB_1:
-		cx = nibble_timeout;
-		while (1) {
-			c0 = read_status(dev);
-			udelay(PLIP_DELAY_UNIT);
-			if (c0 & 0x80) {
-				c1 = read_status(dev);
-				if (c0 == c1)
-					break;
-			}
-			if (--cx == 0)
-				return TIMEOUT;
-		}
-		*data_p |= (c0 << 1) & 0xf0;
-		write_data (dev, 0x00); /* send ACK */
-		*ns_p = PLIP_NB_BEGIN;
-	case PLIP_NB_2:
-		break;
-	}
-	return OK;
-}
-
-/*
- *	Determine the packet's protocol ID. The rule here is that we
- *	assume 802.3 if the type field is short enough to be a length.
- *	This is normal practice and works for any 'now in use' protocol.
- *
- *	PLIP is ethernet ish but the daddr might not be valid if unicast.
- *	PLIP fortunately has no bus architecture (its Point-to-point).
- *
- *	We can't fix the daddr thing as that quirk (more bug) is embedded
- *	in far too many old systems not all even running Linux.
- */
-
-static __be16 plip_type_trans(struct sk_buff *skb, struct net_device *dev)
-{
-	struct ethhdr *eth;
-	unsigned char *rawp;
-
-	skb_reset_mac_header(skb);
-	skb_pull(skb,dev->hard_header_len);
-	eth = eth_hdr(skb);
-
-	if(*eth->h_dest&1)
-	{
-		if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
-			skb->pkt_type=PACKET_BROADCAST;
-		else
-			skb->pkt_type=PACKET_MULTICAST;
-	}
-
-	/*
-	 *	This ALLMULTI check should be redundant by 1.4
-	 *	so don't forget to remove it.
-	 */
-
-	if (ntohs(eth->h_proto) >= 1536)
-		return eth->h_proto;
-
-	rawp = skb->data;
-
-	/*
-	 *	This is a magic hack to spot IPX packets. Older Novell breaks
-	 *	the protocol design and runs IPX over 802.3 without an 802.2 LLC
-	 *	layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
-	 *	won't work for fault tolerant netware but does for the rest.
-	 */
-	if (*(unsigned short *)rawp == 0xFFFF)
-		return htons(ETH_P_802_3);
-
-	/*
-	 *	Real 802.2 LLC
-	 */
-	return htons(ETH_P_802_2);
-}
-
-/* PLIP_RECEIVE_PACKET --- receive a packet */
-static int
-plip_receive_packet(struct net_device *dev, struct net_local *nl,
-		    struct plip_local *snd, struct plip_local *rcv)
-{
-	unsigned short nibble_timeout = nl->nibble;
-	unsigned char *lbuf;
-
-	switch (rcv->state) {
-	case PLIP_PK_TRIGGER:
-		DISABLE(dev->irq);
-		/* Don't need to synchronize irq, as we can safely ignore it */
-		disable_parport_interrupts (dev);
-		write_data (dev, 0x01); /* send ACK */
-		if (net_debug > 2)
-			printk(KERN_DEBUG "%s: receive start\n", dev->name);
-		rcv->state = PLIP_PK_LENGTH_LSB;
-		rcv->nibble = PLIP_NB_BEGIN;
-
-	case PLIP_PK_LENGTH_LSB:
-		if (snd->state != PLIP_PK_DONE) {
-			if (plip_receive(nl->trigger, dev,
-					 &rcv->nibble, &rcv->length.b.lsb)) {
-				/* collision, here dev->tbusy == 1 */
-				rcv->state = PLIP_PK_DONE;
-				nl->is_deferred = 1;
-				nl->connection = PLIP_CN_SEND;
-				schedule_delayed_work(&nl->deferred, 1);
-				enable_parport_interrupts (dev);
-				ENABLE(dev->irq);
-				return OK;
-			}
-		} else {
-			if (plip_receive(nibble_timeout, dev,
-					 &rcv->nibble, &rcv->length.b.lsb))
-				return TIMEOUT;
-		}
-		rcv->state = PLIP_PK_LENGTH_MSB;
-
-	case PLIP_PK_LENGTH_MSB:
-		if (plip_receive(nibble_timeout, dev,
-				 &rcv->nibble, &rcv->length.b.msb))
-			return TIMEOUT;
-		if (rcv->length.h > dev->mtu + dev->hard_header_len ||
-		    rcv->length.h < 8) {
-			printk(KERN_WARNING "%s: bogus packet size %d.\n", dev->name, rcv->length.h);
-			return ERROR;
-		}
-		/* Malloc up new buffer. */
-		rcv->skb = dev_alloc_skb(rcv->length.h + 2);
-		if (rcv->skb == NULL) {
-			printk(KERN_ERR "%s: Memory squeeze.\n", dev->name);
-			return ERROR;
-		}
-		skb_reserve(rcv->skb, 2);	/* Align IP on 16 byte boundaries */
-		skb_put(rcv->skb,rcv->length.h);
-		rcv->skb->dev = dev;
-		rcv->state = PLIP_PK_DATA;
-		rcv->byte = 0;
-		rcv->checksum = 0;
-
-	case PLIP_PK_DATA:
-		lbuf = rcv->skb->data;
-		do {
-			if (plip_receive(nibble_timeout, dev,
-					 &rcv->nibble, &lbuf[rcv->byte]))
-				return TIMEOUT;
-		} while (++rcv->byte < rcv->length.h);
-		do {
-			rcv->checksum += lbuf[--rcv->byte];
-		} while (rcv->byte);
-		rcv->state = PLIP_PK_CHECKSUM;
-
-	case PLIP_PK_CHECKSUM:
-		if (plip_receive(nibble_timeout, dev,
-				 &rcv->nibble, &rcv->data))
-			return TIMEOUT;
-		if (rcv->data != rcv->checksum) {
-			dev->stats.rx_crc_errors++;
-			if (net_debug)
-				printk(KERN_DEBUG "%s: checksum error\n", dev->name);
-			return ERROR;
-		}
-		rcv->state = PLIP_PK_DONE;
-
-	case PLIP_PK_DONE:
-		/* Inform the upper layer for the arrival of a packet. */
-		rcv->skb->protocol=plip_type_trans(rcv->skb, dev);
-		netif_rx_ni(rcv->skb);
-		dev->stats.rx_bytes += rcv->length.h;
-		dev->stats.rx_packets++;
-		rcv->skb = NULL;
-		if (net_debug > 2)
-			printk(KERN_DEBUG "%s: receive end\n", dev->name);
-
-		/* Close the connection. */
-		write_data (dev, 0x00);
-		spin_lock_irq(&nl->lock);
-		if (snd->state != PLIP_PK_DONE) {
-			nl->connection = PLIP_CN_SEND;
-			spin_unlock_irq(&nl->lock);
-			schedule_work(&nl->immediate);
-			enable_parport_interrupts (dev);
-			ENABLE(dev->irq);
-			return OK;
-		} else {
-			nl->connection = PLIP_CN_NONE;
-			spin_unlock_irq(&nl->lock);
-			enable_parport_interrupts (dev);
-			ENABLE(dev->irq);
-			return OK;
-		}
-	}
-	return OK;
-}
-
-/* PLIP_SEND --- send a byte (two nibbles)
-   Returns OK on success, TIMEOUT when timeout    */
-static inline int
-plip_send(unsigned short nibble_timeout, struct net_device *dev,
-	  enum plip_nibble_state *ns_p, unsigned char data)
-{
-	unsigned char c0;
-	unsigned int cx;
-
-	switch (*ns_p) {
-	case PLIP_NB_BEGIN:
-		write_data (dev, data & 0x0f);
-		*ns_p = PLIP_NB_1;
-
-	case PLIP_NB_1:
-		write_data (dev, 0x10 | (data & 0x0f));
-		cx = nibble_timeout;
-		while (1) {
-			c0 = read_status(dev);
-			if ((c0 & 0x80) == 0)
-				break;
-			if (--cx == 0)
-				return TIMEOUT;
-			udelay(PLIP_DELAY_UNIT);
-		}
-		write_data (dev, 0x10 | (data >> 4));
-		*ns_p = PLIP_NB_2;
-
-	case PLIP_NB_2:
-		write_data (dev, (data >> 4));
-		cx = nibble_timeout;
-		while (1) {
-			c0 = read_status(dev);
-			if (c0 & 0x80)
-				break;
-			if (--cx == 0)
-				return TIMEOUT;
-			udelay(PLIP_DELAY_UNIT);
-		}
-		*ns_p = PLIP_NB_BEGIN;
-		return OK;
-	}
-	return OK;
-}
-
-/* PLIP_SEND_PACKET --- send a packet */
-static int
-plip_send_packet(struct net_device *dev, struct net_local *nl,
-		 struct plip_local *snd, struct plip_local *rcv)
-{
-	unsigned short nibble_timeout = nl->nibble;
-	unsigned char *lbuf;
-	unsigned char c0;
-	unsigned int cx;
-
-	if (snd->skb == NULL || (lbuf = snd->skb->data) == NULL) {
-		printk(KERN_DEBUG "%s: send skb lost\n", dev->name);
-		snd->state = PLIP_PK_DONE;
-		snd->skb = NULL;
-		return ERROR;
-	}
-
-	switch (snd->state) {
-	case PLIP_PK_TRIGGER:
-		if ((read_status(dev) & 0xf8) != 0x80)
-			return HS_TIMEOUT;
-
-		/* Trigger remote rx interrupt. */
-		write_data (dev, 0x08);
-		cx = nl->trigger;
-		while (1) {
-			udelay(PLIP_DELAY_UNIT);
-			spin_lock_irq(&nl->lock);
-			if (nl->connection == PLIP_CN_RECEIVE) {
-				spin_unlock_irq(&nl->lock);
-				/* Interrupted. */
-				dev->stats.collisions++;
-				return OK;
-			}
-			c0 = read_status(dev);
-			if (c0 & 0x08) {
-				spin_unlock_irq(&nl->lock);
-				DISABLE(dev->irq);
-				synchronize_irq(dev->irq);
-				if (nl->connection == PLIP_CN_RECEIVE) {
-					/* Interrupted.
-					   We don't need to enable irq,
-					   as it is soon disabled.    */
-					/* Yes, we do. New variant of
-					   {enable,disable}_irq *counts*
-					   them.  -- AV  */
-					ENABLE(dev->irq);
-					dev->stats.collisions++;
-					return OK;
-				}
-				disable_parport_interrupts (dev);
-				if (net_debug > 2)
-					printk(KERN_DEBUG "%s: send start\n", dev->name);
-				snd->state = PLIP_PK_LENGTH_LSB;
-				snd->nibble = PLIP_NB_BEGIN;
-				nl->timeout_count = 0;
-				break;
-			}
-			spin_unlock_irq(&nl->lock);
-			if (--cx == 0) {
-				write_data (dev, 0x00);
-				return HS_TIMEOUT;
-			}
-		}
-
-	case PLIP_PK_LENGTH_LSB:
-		if (plip_send(nibble_timeout, dev,
-			      &snd->nibble, snd->length.b.lsb))
-			return TIMEOUT;
-		snd->state = PLIP_PK_LENGTH_MSB;
-
-	case PLIP_PK_LENGTH_MSB:
-		if (plip_send(nibble_timeout, dev,
-			      &snd->nibble, snd->length.b.msb))
-			return TIMEOUT;
-		snd->state = PLIP_PK_DATA;
-		snd->byte = 0;
-		snd->checksum = 0;
-
-	case PLIP_PK_DATA:
-		do {
-			if (plip_send(nibble_timeout, dev,
-				      &snd->nibble, lbuf[snd->byte]))
-				return TIMEOUT;
-		} while (++snd->byte < snd->length.h);
-		do {
-			snd->checksum += lbuf[--snd->byte];
-		} while (snd->byte);
-		snd->state = PLIP_PK_CHECKSUM;
-
-	case PLIP_PK_CHECKSUM:
-		if (plip_send(nibble_timeout, dev,
-			      &snd->nibble, snd->checksum))
-			return TIMEOUT;
-
-		dev->stats.tx_bytes += snd->skb->len;
-		dev_kfree_skb(snd->skb);
-		dev->stats.tx_packets++;
-		snd->state = PLIP_PK_DONE;
-
-	case PLIP_PK_DONE:
-		/* Close the connection */
-		write_data (dev, 0x00);
-		snd->skb = NULL;
-		if (net_debug > 2)
-			printk(KERN_DEBUG "%s: send end\n", dev->name);
-		nl->connection = PLIP_CN_CLOSING;
-		nl->is_deferred = 1;
-		schedule_delayed_work(&nl->deferred, 1);
-		enable_parport_interrupts (dev);
-		ENABLE(dev->irq);
-		return OK;
-	}
-	return OK;
-}
-
-static int
-plip_connection_close(struct net_device *dev, struct net_local *nl,
-		      struct plip_local *snd, struct plip_local *rcv)
-{
-	spin_lock_irq(&nl->lock);
-	if (nl->connection == PLIP_CN_CLOSING) {
-		nl->connection = PLIP_CN_NONE;
-		netif_wake_queue (dev);
-	}
-	spin_unlock_irq(&nl->lock);
-	if (nl->should_relinquish) {
-		nl->should_relinquish = nl->port_owner = 0;
-		parport_release(nl->pardev);
-	}
-	return OK;
-}
-
-/* PLIP_ERROR --- wait till other end settled */
-static int
-plip_error(struct net_device *dev, struct net_local *nl,
-	   struct plip_local *snd, struct plip_local *rcv)
-{
-	unsigned char status;
-
-	status = read_status(dev);
-	if ((status & 0xf8) == 0x80) {
-		if (net_debug > 2)
-			printk(KERN_DEBUG "%s: reset interface.\n", dev->name);
-		nl->connection = PLIP_CN_NONE;
-		nl->should_relinquish = 0;
-		netif_start_queue (dev);
-		enable_parport_interrupts (dev);
-		ENABLE(dev->irq);
-		netif_wake_queue (dev);
-	} else {
-		nl->is_deferred = 1;
-		schedule_delayed_work(&nl->deferred, 1);
-	}
-
-	return OK;
-}
-
-/* Handle the parallel port interrupts. */
-static void
-plip_interrupt(void *dev_id)
-{
-	struct net_device *dev = dev_id;
-	struct net_local *nl;
-	struct plip_local *rcv;
-	unsigned char c0;
-	unsigned long flags;
-
-	nl = netdev_priv(dev);
-	rcv = &nl->rcv_data;
-
-	spin_lock_irqsave (&nl->lock, flags);
-
-	c0 = read_status(dev);
-	if ((c0 & 0xf8) != 0xc0) {
-		if ((dev->irq != -1) && (net_debug > 1))
-			printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name);
-		spin_unlock_irqrestore (&nl->lock, flags);
-		return;
-	}
-
-	if (net_debug > 3)
-		printk(KERN_DEBUG "%s: interrupt.\n", dev->name);
-
-	switch (nl->connection) {
-	case PLIP_CN_CLOSING:
-		netif_wake_queue (dev);
-	case PLIP_CN_NONE:
-	case PLIP_CN_SEND:
-		rcv->state = PLIP_PK_TRIGGER;
-		nl->connection = PLIP_CN_RECEIVE;
-		nl->timeout_count = 0;
-		schedule_work(&nl->immediate);
-		break;
-
-	case PLIP_CN_RECEIVE:
-		/* May occur because there is race condition
-		   around test and set of dev->interrupt.
-		   Ignore this interrupt. */
-		break;
-
-	case PLIP_CN_ERROR:
-		printk(KERN_ERR "%s: receive interrupt in error state\n", dev->name);
-		break;
-	}
-
-	spin_unlock_irqrestore(&nl->lock, flags);
-}
-
-static int
-plip_tx_packet(struct sk_buff *skb, struct net_device *dev)
-{
-	struct net_local *nl = netdev_priv(dev);
-	struct plip_local *snd = &nl->snd_data;
-
-	if (netif_queue_stopped(dev))
-		return NETDEV_TX_BUSY;
-
-	/* We may need to grab the bus */
-	if (!nl->port_owner) {
-		if (parport_claim(nl->pardev))
-			return NETDEV_TX_BUSY;
-		nl->port_owner = 1;
-	}
-
-	netif_stop_queue (dev);
-
-	if (skb->len > dev->mtu + dev->hard_header_len) {
-		printk(KERN_WARNING "%s: packet too big, %d.\n", dev->name, (int)skb->len);
-		netif_start_queue (dev);
-		return NETDEV_TX_BUSY;
-	}
-
-	if (net_debug > 2)
-		printk(KERN_DEBUG "%s: send request\n", dev->name);
-
-	spin_lock_irq(&nl->lock);
-	snd->skb = skb;
-	snd->length.h = skb->len;
-	snd->state = PLIP_PK_TRIGGER;
-	if (nl->connection == PLIP_CN_NONE) {
-		nl->connection = PLIP_CN_SEND;
-		nl->timeout_count = 0;
-	}
-	schedule_work(&nl->immediate);
-	spin_unlock_irq(&nl->lock);
-
-	return NETDEV_TX_OK;
-}
-
-static void
-plip_rewrite_address(const struct net_device *dev, struct ethhdr *eth)
-{
-	const struct in_device *in_dev;
-
-	rcu_read_lock();
-	in_dev = __in_dev_get_rcu(dev);
-	if (in_dev) {
-		/* Any address will do - we take the first */
-		const struct in_ifaddr *ifa = in_dev->ifa_list;
-		if (ifa) {
-			memcpy(eth->h_source, dev->dev_addr, 6);
-			memset(eth->h_dest, 0xfc, 2);
-			memcpy(eth->h_dest+2, &ifa->ifa_address, 4);
-		}
-	}
-	rcu_read_unlock();
-}
-
-static int
-plip_hard_header(struct sk_buff *skb, struct net_device *dev,
-		 unsigned short type, const void *daddr,
-		 const void *saddr, unsigned len)
-{
-	int ret;
-
-	ret = eth_header(skb, dev, type, daddr, saddr, len);
-	if (ret >= 0)
-		plip_rewrite_address (dev, (struct ethhdr *)skb->data);
-
-	return ret;
-}
-
-static int plip_hard_header_cache(const struct neighbour *neigh,
-				  struct hh_cache *hh, __be16 type)
-{
-	int ret;
-
-	ret = eth_header_cache(neigh, hh, type);
-	if (ret == 0) {
-		struct ethhdr *eth;
-
-		eth = (struct ethhdr*)(((u8*)hh->hh_data) +
-				       HH_DATA_OFF(sizeof(*eth)));
-		plip_rewrite_address (neigh->dev, eth);
-	}
-
-	return ret;
-}
-
-/* Open/initialize the board.  This is called (in the current kernel)
-   sometime after booting when the 'ifconfig' program is run.
-
-   This routine gets exclusive access to the parallel port by allocating
-   its IRQ line.
- */
-static int
-plip_open(struct net_device *dev)
-{
-	struct net_local *nl = netdev_priv(dev);
-	struct in_device *in_dev;
-
-	/* Grab the port */
-	if (!nl->port_owner) {
-		if (parport_claim(nl->pardev)) return -EAGAIN;
-		nl->port_owner = 1;
-	}
-
-	nl->should_relinquish = 0;
-
-	/* Clear the data port. */
-	write_data (dev, 0x00);
-
-	/* Enable rx interrupt. */
-	enable_parport_interrupts (dev);
-	if (dev->irq == -1)
-	{
-		atomic_set (&nl->kill_timer, 0);
-		schedule_delayed_work(&nl->timer, 1);
-	}
-
-	/* Initialize the state machine. */
-	nl->rcv_data.state = nl->snd_data.state = PLIP_PK_DONE;
-	nl->rcv_data.skb = nl->snd_data.skb = NULL;
-	nl->connection = PLIP_CN_NONE;
-	nl->is_deferred = 0;
-
-	/* Fill in the MAC-level header.
-	   We used to abuse dev->broadcast to store the point-to-point
-	   MAC address, but we no longer do it. Instead, we fetch the
-	   interface address whenever it is needed, which is cheap enough
-	   because we use the hh_cache. Actually, abusing dev->broadcast
-	   didn't work, because when using plip_open the point-to-point
-	   address isn't yet known.
-	   PLIP doesn't have a real MAC address, but we need it to be
-	   DOS compatible, and to properly support taps (otherwise,
-	   when the device address isn't identical to the address of a
-	   received frame, the kernel incorrectly drops it).             */
-
-	in_dev=__in_dev_get_rtnl(dev);
-	if (in_dev) {
-		/* Any address will do - we take the first. We already
-		   have the first two bytes filled with 0xfc, from
-		   plip_init_dev(). */
-		struct in_ifaddr *ifa=in_dev->ifa_list;
-		if (ifa != NULL) {
-			memcpy(dev->dev_addr+2, &ifa->ifa_local, 4);
-		}
-	}
-
-	netif_start_queue (dev);
-
-	return 0;
-}
-
-/* The inverse routine to plip_open (). */
-static int
-plip_close(struct net_device *dev)
-{
-	struct net_local *nl = netdev_priv(dev);
-	struct plip_local *snd = &nl->snd_data;
-	struct plip_local *rcv = &nl->rcv_data;
-
-	netif_stop_queue (dev);
-	DISABLE(dev->irq);
-	synchronize_irq(dev->irq);
-
-	if (dev->irq == -1)
-	{
-		init_completion(&nl->killed_timer_cmp);
-		atomic_set (&nl->kill_timer, 1);
-		wait_for_completion(&nl->killed_timer_cmp);
-	}
-
-#ifdef NOTDEF
-	outb(0x00, PAR_DATA(dev));
-#endif
-	nl->is_deferred = 0;
-	nl->connection = PLIP_CN_NONE;
-	if (nl->port_owner) {
-		parport_release(nl->pardev);
-		nl->port_owner = 0;
-	}
-
-	snd->state = PLIP_PK_DONE;
-	if (snd->skb) {
-		dev_kfree_skb(snd->skb);
-		snd->skb = NULL;
-	}
-	rcv->state = PLIP_PK_DONE;
-	if (rcv->skb) {
-		kfree_skb(rcv->skb);
-		rcv->skb = NULL;
-	}
-
-#ifdef NOTDEF
-	/* Reset. */
-	outb(0x00, PAR_CONTROL(dev));
-#endif
-	return 0;
-}
-
-static int
-plip_preempt(void *handle)
-{
-	struct net_device *dev = (struct net_device *)handle;
-	struct net_local *nl = netdev_priv(dev);
-
-	/* Stand our ground if a datagram is on the wire */
-	if (nl->connection != PLIP_CN_NONE) {
-		nl->should_relinquish = 1;
-		return 1;
-	}
-
-	nl->port_owner = 0;	/* Remember that we released the bus */
-	return 0;
-}
-
-static void
-plip_wakeup(void *handle)
-{
-	struct net_device *dev = (struct net_device *)handle;
-	struct net_local *nl = netdev_priv(dev);
-
-	if (nl->port_owner) {
-		/* Why are we being woken up? */
-		printk(KERN_DEBUG "%s: why am I being woken up?\n", dev->name);
-		if (!parport_claim(nl->pardev))
-			/* bus_owner is already set (but why?) */
-			printk(KERN_DEBUG "%s: I'm broken.\n", dev->name);
-		else
-			return;
-	}
-
-	if (!(dev->flags & IFF_UP))
-		/* Don't need the port when the interface is down */
-		return;
-
-	if (!parport_claim(nl->pardev)) {
-		nl->port_owner = 1;
-		/* Clear the data port. */
-		write_data (dev, 0x00);
-	}
-}
-
-static int
-plip_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
-	struct net_local *nl = netdev_priv(dev);
-	struct plipconf *pc = (struct plipconf *) &rq->ifr_ifru;
-
-	if (cmd != SIOCDEVPLIP)
-		return -EOPNOTSUPP;
-
-	switch(pc->pcmd) {
-	case PLIP_GET_TIMEOUT:
-		pc->trigger = nl->trigger;
-		pc->nibble  = nl->nibble;
-		break;
-	case PLIP_SET_TIMEOUT:
-		if(!capable(CAP_NET_ADMIN))
-			return -EPERM;
-		nl->trigger = pc->trigger;
-		nl->nibble  = pc->nibble;
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-	return 0;
-}
-
-static int parport[PLIP_MAX] = { [0 ... PLIP_MAX-1] = -1 };
-static int timid;
-
-module_param_array(parport, int, NULL, 0);
-module_param(timid, int, 0);
-MODULE_PARM_DESC(parport, "List of parport device numbers to use by plip");
-
-static struct net_device *dev_plip[PLIP_MAX] = { NULL, };
-
-static inline int
-plip_searchfor(int list[], int a)
-{
-	int i;
-	for (i = 0; i < PLIP_MAX && list[i] != -1; i++) {
-		if (list[i] == a) return 1;
-	}
-	return 0;
-}
-
-/* plip_attach() is called (by the parport code) when a port is
- * available to use. */
-static void plip_attach (struct parport *port)
-{
-	static int unit;
-	struct net_device *dev;
-	struct net_local *nl;
-	char name[IFNAMSIZ];
-
-	if ((parport[0] == -1 && (!timid || !port->devices)) ||
-	    plip_searchfor(parport, port->number)) {
-		if (unit == PLIP_MAX) {
-			printk(KERN_ERR "plip: too many devices\n");
-			return;
-		}
-
-		sprintf(name, "plip%d", unit);
-		dev = alloc_etherdev(sizeof(struct net_local));
-		if (!dev) {
-			printk(KERN_ERR "plip: memory squeeze\n");
-			return;
-		}
-
-		strcpy(dev->name, name);
-
-		dev->irq = port->irq;
-		dev->base_addr = port->base;
-		if (port->irq == -1) {
-			printk(KERN_INFO "plip: %s has no IRQ. Using IRQ-less mode,"
-		                 "which is fairly inefficient!\n", port->name);
-		}
-
-		nl = netdev_priv(dev);
-		nl->dev = dev;
-		nl->pardev = parport_register_device(port, dev->name, plip_preempt,
-						 plip_wakeup, plip_interrupt,
-						 0, dev);
-
-		if (!nl->pardev) {
-			printk(KERN_ERR "%s: parport_register failed\n", name);
-			goto err_free_dev;
-		}
-
-		plip_init_netdev(dev);
-
-		if (register_netdev(dev)) {
-			printk(KERN_ERR "%s: network register failed\n", name);
-			goto err_parport_unregister;
-		}
-
-		printk(KERN_INFO "%s", version);
-		if (dev->irq != -1)
-			printk(KERN_INFO "%s: Parallel port at %#3lx, "
-					 "using IRQ %d.\n",
-				         dev->name, dev->base_addr, dev->irq);
-		else
-			printk(KERN_INFO "%s: Parallel port at %#3lx, "
-					 "not using IRQ.\n",
-					 dev->name, dev->base_addr);
-		dev_plip[unit++] = dev;
-	}
-	return;
-
-err_parport_unregister:
-	parport_unregister_device(nl->pardev);
-err_free_dev:
-	free_netdev(dev);
-}
-
-/* plip_detach() is called (by the parport code) when a port is
- * no longer available to use. */
-static void plip_detach (struct parport *port)
-{
-	/* Nothing to do */
-}
-
-static struct parport_driver plip_driver = {
-	.name	= "plip",
-	.attach = plip_attach,
-	.detach = plip_detach
-};
-
-static void __exit plip_cleanup_module (void)
-{
-	struct net_device *dev;
-	int i;
-
-	parport_unregister_driver (&plip_driver);
-
-	for (i=0; i < PLIP_MAX; i++) {
-		if ((dev = dev_plip[i])) {
-			struct net_local *nl = netdev_priv(dev);
-			unregister_netdev(dev);
-			if (nl->port_owner)
-				parport_release(nl->pardev);
-			parport_unregister_device(nl->pardev);
-			free_netdev(dev);
-			dev_plip[i] = NULL;
-		}
-	}
-}
-
-#ifndef MODULE
-
-static int parport_ptr;
-
-static int __init plip_setup(char *str)
-{
-	int ints[4];
-
-	str = get_options(str, ARRAY_SIZE(ints), ints);
-
-	/* Ugh. */
-	if (!strncmp(str, "parport", 7)) {
-		int n = simple_strtoul(str+7, NULL, 10);
-		if (parport_ptr < PLIP_MAX)
-			parport[parport_ptr++] = n;
-		else
-			printk(KERN_INFO "plip: too many ports, %s ignored.\n",
-			       str);
-	} else if (!strcmp(str, "timid")) {
-		timid = 1;
-	} else {
-		if (ints[0] == 0 || ints[1] == 0) {
-			/* disable driver on "plip=" or "plip=0" */
-			parport[0] = -2;
-		} else {
-			printk(KERN_WARNING "warning: 'plip=0x%x' ignored\n",
-			       ints[1]);
-		}
-	}
-	return 1;
-}
-
-__setup("plip=", plip_setup);
-
-#endif /* !MODULE */
-
-static int __init plip_init (void)
-{
-	if (parport[0] == -2)
-		return 0;
-
-	if (parport[0] != -1 && timid) {
-		printk(KERN_WARNING "plip: warning, ignoring `timid' since specific ports given.\n");
-		timid = 0;
-	}
-
-	if (parport_register_driver (&plip_driver)) {
-		printk (KERN_WARNING "plip: couldn't register driver\n");
-		return 1;
-	}
-
-	return 0;
-}
-
-module_init(plip_init);
-module_exit(plip_cleanup_module);
-MODULE_LICENSE("GPL");