patch-2.1.71 linux/drivers/net/mkiss.c

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diff -u --recursive --new-file v2.1.70/linux/drivers/net/mkiss.c linux/drivers/net/mkiss.c
@@ -1,1134 +0,0 @@
-/*
- *	MKISS Driver
- *
- *	This module:
- *		This module 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 module implements the AX.25 protocol for kernel-based
- *		devices like TTYs. It interfaces between a raw TTY, and the
- *		kernel's AX.25 protocol layers, just like slip.c.
- *		AX.25 needs to be seperated from slip.c while slip.c is no
- *		longer a static kernel device since it is a module.
- *		This method clears the way to implement other kiss protocols
- *		like mkiss smack g8bpq ..... so far only mkiss is implemented.
- *
- * Hans Alblas <hans@esrac.ele.tue.nl>
- *
- *	History
- *	Jonathan (G4KLX)	Fixed to match Linux networking changes - 2.1.15.
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <asm/system.h>
-#include <asm/segment.h>
-#include <asm/bitops.h>
-#include <asm/uaccess.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/in.h>
-#include <linux/inet.h>
-#include <linux/tty.h>
-#include <linux/errno.h>
-#include <linux/netdevice.h>
-#include <linux/major.h>
-#include <linux/init.h>
-
-#include <linux/timer.h>
-
-#include <linux/etherdevice.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-
-#include <net/ax25.h>
-
-#include "mkiss.h"
-
-#ifdef CONFIG_INET
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#endif
-
-#ifdef MODULE
-#define AX25_VERSION    "AX25-MODULAR-NET3.019-NEWTTY"
-#define	min(a,b)	(a < b ? a : b)
-#else
-#define	AX25_VERSION	"AX25-NET3.019-NEWTTY"
-#endif
-
-#define NR_MKISS 4
-#define MKISS_SERIAL_TYPE_NORMAL 1
-
-struct mkiss_channel {
-	int magic;		/* magic word */
-	int init;		/* channel exists? */
-	struct tty_struct *tty; /* link to tty control structure */
-};
-
-typedef struct ax25_ctrl {
-	char if_name[8];	/* "ax0\0" .. "ax99999\0"	*/
-	struct ax_disp ctrl;	/* 				*/
-	struct device  dev;	/* the device			*/
-} ax25_ctrl_t;
-
-static ax25_ctrl_t **ax25_ctrls = NULL;
-
-int ax25_maxdev = AX25_MAXDEV;		/* Can be overridden with insmod! */
-
-static struct tty_ldisc	ax_ldisc;
-static struct tty_driver mkiss_driver;
-static int mkiss_refcount;
-static struct tty_struct *mkiss_table[NR_MKISS];
-static struct termios *mkiss_termios[NR_MKISS];
-static struct termios *mkiss_termios_locked[NR_MKISS];
-struct mkiss_channel MKISS_Info[NR_MKISS];
-
-static int ax25_init(struct device *);
-static int mkiss_init(void);
-static int mkiss_write(struct tty_struct *, int, const unsigned char *, int);
-static int kiss_esc(unsigned char *, unsigned char *, int);
-static void kiss_unesc(struct ax_disp *, unsigned char);
-
-/* Find a free channel, and link in this `tty' line. */
-static inline struct ax_disp *ax_alloc(void)
-{
-	ax25_ctrl_t *axp;
-	int i;
-
-	if (ax25_ctrls == NULL)		/* Master array missing ! */
-		return NULL;
-
-	for (i = 0; i < ax25_maxdev; i++) {
-		axp = ax25_ctrls[i];
-
-		/* Not allocated ? */
-		if (axp == NULL)
-			break;
-
-		/* Not in use ? */
-		if (!test_and_set_bit(AXF_INUSE, &axp->ctrl.flags))
-			break;
-	}
-
-	/* Sorry, too many, all slots in use */
-	if (i >= ax25_maxdev)
-		return NULL;
-
-	/* If no channels are available, allocate one */
-	if (axp == NULL && (ax25_ctrls[i] = kmalloc(sizeof(ax25_ctrl_t), GFP_KERNEL)) != NULL) {
-		axp = ax25_ctrls[i];
-		memset(axp, 0, sizeof(ax25_ctrl_t));
-
-		/* Initialize channel control data */
-		set_bit(AXF_INUSE, &axp->ctrl.flags);
-		sprintf(axp->if_name, "ax%d", i++);
-		axp->ctrl.tty      = NULL;
-		axp->dev.name      = axp->if_name;
-		axp->dev.base_addr = i;
-		axp->dev.priv      = (void *)&axp->ctrl;
-		axp->dev.next      = NULL;
-		axp->dev.init      = ax25_init;
-	}
-
-	if (axp != NULL) {
-		/*
-		 * register device so that it can be ifconfig'ed
-		 * ax25_init() will be called as a side-effect
-		 * SIDE-EFFECT WARNING: ax25_init() CLEARS axp->ctrl !
-		 */
-		if (register_netdev(&axp->dev) == 0) {
-			/* (Re-)Set the INUSE bit.   Very Important! */
-			set_bit(AXF_INUSE, &axp->ctrl.flags);
-			axp->ctrl.dev = &axp->dev;
-			axp->dev.priv = (void *)&axp->ctrl;
-
-			return &axp->ctrl;
-		} else {
-			clear_bit(AXF_INUSE,&axp->ctrl.flags);
-			printk(KERN_ERR "mkiss: ax_alloc() - register_netdev() failure.\n");
-		}
-	}
-
-	return NULL;
-}
-
-/* Free an AX25 channel. */
-static inline void ax_free(struct ax_disp *ax)
-{
-	/* Free all AX25 frame buffers. */
-	if (ax->rbuff)
-		kfree(ax->rbuff);
-	ax->rbuff = NULL;
-	if (ax->xbuff)
-		kfree(ax->xbuff);
-	ax->xbuff = NULL;
-	if (!test_and_clear_bit(AXF_INUSE, &ax->flags))
-		printk(KERN_ERR "mkiss: %s: ax_free for already free unit.\n", ax->dev->name);
-}
-
-static void ax_changedmtu(struct ax_disp *ax)
-{
-	struct device *dev = ax->dev;
-	unsigned char *xbuff, *rbuff, *oxbuff, *orbuff;
-	int len;
-	unsigned long flags;
-
-	len = dev->mtu * 2;
-
-	/*
-	 * allow for arrival of larger UDP packets, even if we say not to
-	 * also fixes a bug in which SunOS sends 512-byte packets even with
-	 * an MSS of 128
-	 */
-	if (len < 576 * 2)
-		len = 576 * 2;
-
-	xbuff = kmalloc(len + 4, GFP_ATOMIC);
-	rbuff = kmalloc(len + 4, GFP_ATOMIC);
-
-	if (xbuff == NULL || rbuff == NULL)  {
-		printk(KERN_ERR "mkiss: %s: unable to grow ax25 buffers, MTU change cancelled.\n",
-		       ax->dev->name);
-		dev->mtu = ax->mtu;
-		if (xbuff != NULL)
-			kfree(xbuff);
-		if (rbuff != NULL)
-			kfree(rbuff);
-		return;
-	}
-
-	save_flags(flags);
-	cli();
-
-	oxbuff    = ax->xbuff;
-	ax->xbuff = xbuff;
-	orbuff    = ax->rbuff;
-	ax->rbuff = rbuff;
-
-	if (ax->xleft) {
-		if (ax->xleft <= len) {
-			memcpy(ax->xbuff, ax->xhead, ax->xleft);
-		} else  {
-			ax->xleft = 0;
-			ax->tx_dropped++;
-		}
-	}
-
-	ax->xhead = ax->xbuff;
-
-	if (ax->rcount) {
-		if (ax->rcount <= len) {
-			memcpy(ax->rbuff, orbuff, ax->rcount);
-		} else  {
-			ax->rcount = 0;
-			ax->rx_over_errors++;
-			set_bit(AXF_ERROR, &ax->flags);
-		}
-	}
-
-	ax->mtu      = dev->mtu + 73;
-	ax->buffsize = len;
-
-	restore_flags(flags);
-
-	if (oxbuff != NULL)
-		kfree(oxbuff);
-	if (orbuff != NULL)
-		kfree(orbuff);
-}
-
-
-/* Set the "sending" flag.  This must be atomic, hence the ASM. */
-static inline void ax_lock(struct ax_disp *ax)
-{
-	if (test_and_set_bit(0, (void *)&ax->dev->tbusy))
-		printk(KERN_ERR "mkiss: %s: trying to lock already locked device!\n", ax->dev->name);
-}
-
-
-/* Clear the "sending" flag.  This must be atomic, hence the ASM. */
-static inline void ax_unlock(struct ax_disp *ax)
-{
-	if (!test_and_clear_bit(0, (void *)&ax->dev->tbusy))
-		printk(KERN_ERR "mkiss: %s: trying to unlock already unlocked device!\n", ax->dev->name);
-}
-
-/* Send one completely decapsulated AX.25 packet to the AX.25 layer. */
-static void ax_bump(struct ax_disp *ax)
-{
-	struct ax_disp *tmp_ax;
-	struct sk_buff *skb;
-	struct mkiss_channel *mkiss;
-	int count;
-
-        tmp_ax = ax;
-
-	if (ax->rbuff[0] > 0x0f) {
-		if (ax->mkiss != NULL) {
-			mkiss= ax->mkiss->tty->driver_data;
-			if (mkiss->magic == MKISS_DRIVER_MAGIC)
-				tmp_ax = ax->mkiss;
-		}
- 	}
-
-	count = ax->rcount;
-
-	if ((skb = dev_alloc_skb(count)) == NULL) {
-		printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n", ax->dev->name);
-		ax->rx_dropped++;
-		return;
-	}
-
-	skb->dev      = tmp_ax->dev;
-	memcpy(skb_put(skb,count), ax->rbuff, count);
-	skb->mac.raw  = skb->data;
-	skb->protocol = htons(ETH_P_AX25);
-	netif_rx(skb);
-	tmp_ax->rx_packets++;
-}
-
-/* Encapsulate one AX.25 packet and stuff into a TTY queue. */
-static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len)
-{
-	unsigned char *p;
-	int actual, count;
-	struct mkiss_channel *mkiss = ax->tty->driver_data;
-
-	if (ax->mtu != ax->dev->mtu + 73)	/* Someone has been ifconfigging */
-		ax_changedmtu(ax);
-
-	if (len > ax->mtu) {		/* Sigh, shouldn't occur BUT ... */
-		len = ax->mtu;
-		printk(KERN_ERR "mkiss: %s: truncating oversized transmit packet!\n", ax->dev->name);
-		ax->tx_dropped++;
-		ax_unlock(ax);
-		return;
-	}
-
-	p = icp;
-
-	if (mkiss->magic  != MKISS_DRIVER_MAGIC) {
-		count = kiss_esc(p, (unsigned char *)ax->xbuff, len);
-		ax->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
-		actual = ax->tty->driver.write(ax->tty, 0, ax->xbuff, count);
-		ax->tx_packets++;
-		ax->dev->trans_start = jiffies;
-		ax->xleft = count - actual;
-		ax->xhead = ax->xbuff + actual;
-	} else {
-		count = kiss_esc(p, (unsigned char *) ax->mkiss->xbuff, len);
-		ax->mkiss->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
-		actual = ax->mkiss->tty->driver.write(ax->mkiss->tty, 0, ax->mkiss->xbuff, count);
-		ax->tx_packets++;
-		ax->mkiss->dev->trans_start = jiffies;
-		ax->mkiss->xleft = count - actual;
-		ax->mkiss->xhead = ax->mkiss->xbuff + actual;
-	}
-}
-
-/*
- * Called by the driver when there's room for more data.  If we have
- * more packets to send, we send them here.
- */
-static void ax25_write_wakeup(struct tty_struct *tty)
-{
-	int actual;
-	struct ax_disp *ax = (struct ax_disp *)tty->disc_data;
-	struct mkiss_channel *mkiss;
-
-	/* First make sure we're connected. */
-	if (ax == NULL || ax->magic != AX25_MAGIC || !ax->dev->start)
-		return;
-	if (ax->xleft <= 0)  {
-		/* Now serial buffer is almost free & we can start
-		 * transmission of another packet
-		 */
-		tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
-
-		if (ax->mkiss != NULL) {
-			mkiss= ax->mkiss->tty->driver_data;
-	        	if (mkiss->magic  == MKISS_DRIVER_MAGIC)
-				ax_unlock(ax->mkiss);
-	        }
-
-		ax_unlock(ax);
-		mark_bh(NET_BH);
-		return;
-	}
-
-	actual = tty->driver.write(tty, 0, ax->xhead, ax->xleft);
-	ax->xleft -= actual;
-	ax->xhead += actual;
-}
-
-/* Encapsulate an AX.25 packet and kick it into a TTY queue. */
-static int ax_xmit(struct sk_buff *skb, struct device *dev)
-{
-	struct ax_disp *ax = (struct ax_disp*)dev->priv;
-	struct mkiss_channel *mkiss = ax->tty->driver_data;
-	struct ax_disp *tmp_ax;
-
-	tmp_ax = NULL;
-
-	if (mkiss->magic  == MKISS_DRIVER_MAGIC) {
-		if (skb->data[0] < 0x10)
-			skb->data[0] = skb->data[0] + 0x10;
-		tmp_ax = ax->mkiss;
-	}
-
-	if (!dev->start)  {
-		printk(KERN_ERR "mkiss: %s: xmit call when iface is down\n", dev->name);
-		return 1;
-	}
-
-	if (tmp_ax != NULL)
-		if (tmp_ax->dev->tbusy)
-			return 1;
-
-	if (tmp_ax != NULL)
-		if (dev->tbusy) {
-			printk(KERN_ERR "mkiss: dev busy while serial dev is free\n");
-			ax_unlock(ax);
-	        }
-
-	if (dev->tbusy) {
-		/*
-		 * May be we must check transmitter timeout here ?
-		 *      14 Oct 1994 Dmitry Gorodchanin.
-		 */
-		if (jiffies - dev->trans_start  < 20 * HZ) {
-			/* 20 sec timeout not reached */
-			return 1;
-		}
-
-		printk(KERN_ERR "mkiss: %s: transmit timed out, %s?\n", dev->name,
-		       (ax->tty->driver.chars_in_buffer(ax->tty) || ax->xleft) ?
-		       "bad line quality" : "driver error");
-
-		ax->xleft = 0;
-		ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
-		ax_unlock(ax);
-	}
-
-	/* We were not busy, so we are now... :-) */
-	if (skb != NULL) {
-		ax_lock(ax);
-		if (tmp_ax != NULL)
-			ax_lock(tmp_ax);
-		ax_encaps(ax, skb->data, skb->len);
-		kfree_skb(skb, FREE_WRITE);
-	}
-
-	return 0;
-}
-
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-
-/* Return the frame type ID */
-static int ax_header(struct sk_buff *skb, struct device *dev, unsigned short type,
-	  void *daddr, void *saddr, unsigned len)
-{
-#ifdef CONFIG_INET
-	if (type != htons(ETH_P_AX25))
-		return ax25_encapsulate(skb, dev, type, daddr, saddr, len);
-#endif
-	return 0;
-}
-
-
-static int ax_rebuild_header(struct sk_buff *skb)
-{
-#ifdef CONFIG_INET
-	return ax25_rebuild_header(skb);
-#else
-	return 0;
-#endif
-}
-
-#endif	/* CONFIG_{AX25,AX25_MODULE} */
-
-/* Open the low-level part of the AX25 channel. Easy! */
-static int ax_open(struct device *dev)
-{
-	struct ax_disp *ax = (struct ax_disp*)dev->priv;
-	unsigned long len;
-
-	if (ax->tty == NULL)
-		return -ENODEV;
-
-	/*
-	 * Allocate the frame buffers:
-	 *
-	 * rbuff	Receive buffer.
-	 * xbuff	Transmit buffer.
-	 * cbuff        Temporary compression buffer.
-	 */
-	len = dev->mtu * 2;
-
-	/*
-	 * allow for arrival of larger UDP packets, even if we say not to
-	 * also fixes a bug in which SunOS sends 512-byte packets even with
-	 * an MSS of 128
-	 */
-	if (len < 576 * 2)
-		len = 576 * 2;
-
-	if ((ax->rbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL)
-		goto norbuff;
-
-	if ((ax->xbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL)
-		goto noxbuff;
-
-	ax->mtu	     = dev->mtu + 73;
-	ax->buffsize = len;
-	ax->rcount   = 0;
-	ax->xleft    = 0;
-
-	ax->flags   &= (1 << AXF_INUSE);      /* Clear ESCAPE & ERROR flags */
-	dev->tbusy  = 0;
-	dev->start  = 1;
-
-	return 0;
-
-	/* Cleanup */
-	kfree(ax->xbuff);
-
-noxbuff:
-	kfree(ax->rbuff);
-
-norbuff:
-	return -ENOMEM;
-}
-
-
-/* Close the low-level part of the AX25 channel. Easy! */
-static int ax_close(struct device *dev)
-{
-	struct ax_disp *ax = (struct ax_disp*)dev->priv;
-
-	if (ax->tty == NULL)
-		return -EBUSY;
-
-	ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
-
-	dev->tbusy = 1;
-	dev->start = 0;
-
-	return 0;
-}
-
-static int ax25_receive_room(struct tty_struct *tty)
-{
-	return 65536;  /* We can handle an infinite amount of data. :-) */
-}
-
-/*
- * Handle the 'receiver data ready' interrupt.
- * This function is called by the 'tty_io' module in the kernel when
- * a block of data has been received, which can now be decapsulated
- * and sent on to the AX.25 layer for further processing.
- */
-static void ax25_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count)
-{
-	struct ax_disp *ax = (struct ax_disp *)tty->disc_data;
-
-	if (ax == NULL || ax->magic != AX25_MAGIC || !ax->dev->start)
-		return;
-
-	/*
-	 * Argh! mtu change time! - costs us the packet part received
-	 * at the change
-	 */
-	if (ax->mtu != ax->dev->mtu + 73)
-		ax_changedmtu(ax);
-
-	/* Read the characters out of the buffer */
-	while (count--) {
-		if (fp != NULL && *fp++) {
-			if (!test_and_set_bit(AXF_ERROR, &ax->flags))
-				ax->rx_errors++;
-			cp++;
-			continue;
-		}
-
-		kiss_unesc(ax, *cp++);
-	}
-}
-
-static int ax25_open(struct tty_struct *tty)
-{
-	struct ax_disp *ax = (struct ax_disp *)tty->disc_data;
-	struct ax_disp *tmp_ax;
-	struct mkiss_channel *mkiss;
-	int err, cnt;
-
-	/* First make sure we're not already connected. */
-	if (ax && ax->magic == AX25_MAGIC)
-		return -EEXIST;
-
-	/* OK.  Find a free AX25 channel to use. */
-	if ((ax = ax_alloc()) == NULL)
-		return -ENFILE;
-
-	ax->tty = tty;
-	tty->disc_data = ax;
-
-	ax->mkiss = NULL;
-	tmp_ax    = NULL;
-
-	if (tty->driver.flush_buffer)
-		tty->driver.flush_buffer(tty);
-	if (tty->ldisc.flush_buffer)
-		tty->ldisc.flush_buffer(tty);
-
-	/* Restore default settings */
-	ax->dev->type = ARPHRD_AX25;
-
-	/* Perform the low-level AX25 initialization. */
-	if ((err = ax_open(ax->dev)))
-		return err;
-
-	mkiss= ax->tty->driver_data;
-
-	if (mkiss->magic  == MKISS_DRIVER_MAGIC) {
-		for (cnt = 1; cnt < ax25_maxdev; cnt++) {
-			if (ax25_ctrls[cnt]) {
-				if (ax25_ctrls[cnt]->dev.start) {
-					if (ax == &ax25_ctrls[cnt]->ctrl) {
-						cnt--;
-						tmp_ax = &ax25_ctrls[cnt]->ctrl;
-						break;
-					}
-				}
-			}
-		}
-	}
-
-	if (tmp_ax != NULL) {
-		ax->mkiss     = tmp_ax;
-		tmp_ax->mkiss = ax;
-	}
-
-	MOD_INC_USE_COUNT;
-
-	/* Done.  We have linked the TTY line to a channel. */
-	return ax->dev->base_addr;
-}
-
-static void ax25_close(struct tty_struct *tty)
-{
-	struct ax_disp *ax = (struct ax_disp *)tty->disc_data;
-	int mkiss ;
-
-	/* First make sure we're connected. */
-	if (ax == NULL || ax->magic != AX25_MAGIC)
-		return;
-
-	mkiss = ax->mode;
-	if (ax->dev->flags & IFF_UP)
-	{
-		dev_lock_wait();
-		dev_close(ax->dev);
-		dev_unlock_list();
-	}
-
-	tty->disc_data = 0;
-	ax->tty        = NULL;
-
-	/* VSV = very important to remove timers */
-	ax_free(ax);
-	unregister_netdev(ax->dev);
-
-	MOD_DEC_USE_COUNT;
-}
-
-
-static struct net_device_stats *ax_get_stats(struct device *dev)
-{
-	static struct net_device_stats stats;
-	struct ax_disp *ax = (struct ax_disp*)dev->priv;
-
-	memset(&stats, 0, sizeof(struct net_device_stats));
-
-	stats.rx_packets     = ax->rx_packets;
-	stats.tx_packets     = ax->tx_packets;
-	stats.rx_dropped     = ax->rx_dropped;
-	stats.tx_dropped     = ax->tx_dropped;
-	stats.tx_errors      = ax->tx_errors;
-	stats.rx_errors      = ax->rx_errors;
-	stats.rx_over_errors = ax->rx_over_errors;
-
-	return &stats;
-}
-
-
-/************************************************************************
- *			   STANDARD ENCAPSULATION	        	 *
- ************************************************************************/
-
-int kiss_esc(unsigned char *s, unsigned char *d, int len)
-{
-	unsigned char *ptr = d;
-	unsigned char c;
-
-	/*
-	 * Send an initial END character to flush out any
-	 * data that may have accumulated in the receiver
-	 * due to line noise.
-	 */
-
-	*ptr++ = END;
-
-	while (len-- > 0) {
-		switch (c = *s++) {
-			case END:
-				*ptr++ = ESC;
-				*ptr++ = ESC_END;
-				break;
-			case ESC:
-				*ptr++ = ESC;
-				*ptr++ = ESC_ESC;
-				break;
-			default:
-				*ptr++ = c;
-				break;
-		}
-	}
-
-	*ptr++ = END;
-
-	return ptr - d;
-}
-
-static void kiss_unesc(struct ax_disp *ax, unsigned char s)
-{
-	switch (s) {
-		case END:
-			/* drop keeptest bit = VSV */
-			if (test_bit(AXF_KEEPTEST, &ax->flags))
-				clear_bit(AXF_KEEPTEST, &ax->flags);
-
-			if (!test_and_clear_bit(AXF_ERROR, &ax->flags) && (ax->rcount > 2))
-				ax_bump(ax);
-
-			clear_bit(AXF_ESCAPE, &ax->flags);
-			ax->rcount = 0;
-			return;
-
-		case ESC:
-			set_bit(AXF_ESCAPE, &ax->flags);
-			return;
-		case ESC_ESC:
-			if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
-				s = ESC;
-			break;
-		case ESC_END:
-			if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
-				s = END;
-			break;
-	}
-
-	if (!test_bit(AXF_ERROR, &ax->flags)) {
-		if (ax->rcount < ax->buffsize) {
-			ax->rbuff[ax->rcount++] = s;
-			return;
-		}
-
-		ax->rx_over_errors++;
-		set_bit(AXF_ERROR, &ax->flags);
-	}
-}
-
-
-int ax_set_mac_address(struct device *dev, void *addr)
-{
-	int err;
-
-	if ((err = verify_area(VERIFY_READ, addr, AX25_ADDR_LEN)) != 0)
-		return err;
-
-	/* addr is an AX.25 shifted ASCII mac address */
-	copy_from_user(dev->dev_addr, addr, AX25_ADDR_LEN);
-
-	return 0;
-}
-
-static int ax_set_dev_mac_address(struct device *dev, void *addr)
-{
-	struct sockaddr *sa = addr;
-
-	memcpy(dev->dev_addr, sa->sa_data, AX25_ADDR_LEN);
-
-	return 0;
-}
-
-
-/* Perform I/O control on an active ax25 channel. */
-static int ax25_disp_ioctl(struct tty_struct *tty, void *file, int cmd, void *arg)
-{
-	struct ax_disp *ax = (struct ax_disp *)tty->disc_data;
-	int err;
-	unsigned int tmp;
-
-	/* First make sure we're connected. */
-	if (ax == NULL || ax->magic != AX25_MAGIC)
-		return -EINVAL;
-
-	switch (cmd) {
-	 	case SIOCGIFNAME:
-			if ((err = verify_area(VERIFY_WRITE, arg, strlen(ax->dev->name) + 1)) != 0)
-				return err;
-			copy_to_user(arg, ax->dev->name, strlen(ax->dev->name) + 1);
-			return 0;
-
-		case SIOCGIFENCAP:
-			if ((err = verify_area(VERIFY_WRITE, arg, sizeof(int))) != 0)
-				return err;
-			put_user(4, (int *)arg);
-			return 0;
-
-		case SIOCSIFENCAP:
-			if ((err = verify_area(VERIFY_READ, arg, sizeof(int))) != 0)
-				return err;
-			get_user(tmp, (int *)arg);
-	 		ax->mode = tmp;
-			ax->dev->addr_len        = AX25_ADDR_LEN;	  /* sizeof an AX.25 addr */
-			ax->dev->hard_header_len = AX25_KISS_HEADER_LEN + AX25_MAX_HEADER_LEN + 3;
-			ax->dev->type            = ARPHRD_AX25;
-			return 0;
-
-		 case SIOCSIFHWADDR:
-			return ax_set_mac_address(ax->dev, arg);
-
-		default:
-			return -ENOIOCTLCMD;
-	}
-}
-
-static int ax_open_dev(struct device *dev)
-{
-	struct ax_disp *ax = (struct ax_disp*)dev->priv;
-
-	if (ax->tty==NULL)
-		return -ENODEV;
-
-	return 0;
-}
-
-/* Initialize AX25 control device -- register AX25 line discipline */
-__initfunc(int mkiss_init_ctrl_dev(void))
-{
-	int status;
-
-	if (ax25_maxdev < 4) ax25_maxdev = 4; /* Sanity */
-
-	if ((ax25_ctrls = kmalloc(sizeof(void*) * ax25_maxdev, GFP_KERNEL)) == NULL) {
-		printk(KERN_ERR "mkiss: Can't allocate ax25_ctrls[] array !  No mkiss available\n");
-		return -ENOMEM;
-	}
-
-	/* Clear the pointer array, we allocate devices when we need them */
-	memset(ax25_ctrls, 0, sizeof(void*) * ax25_maxdev); /* Pointers */
-
-	/* Fill in our line protocol discipline, and register it */
-	memset(&ax_ldisc, 0, sizeof(ax_ldisc));
-	ax_ldisc.magic  = TTY_LDISC_MAGIC;
-	ax_ldisc.name   = "mkiss";
-	ax_ldisc.flags  = 0;
-	ax_ldisc.open   = ax25_open;
-	ax_ldisc.close  = ax25_close;
-	ax_ldisc.read   = NULL;
-	ax_ldisc.write  = NULL;
-	ax_ldisc.ioctl  = (int (*)(struct tty_struct *, struct file *, unsigned int, unsigned long))ax25_disp_ioctl;
-	ax_ldisc.poll   = NULL;
-
-	ax_ldisc.receive_buf  = ax25_receive_buf;
-	ax_ldisc.receive_room = ax25_receive_room;
-	ax_ldisc.write_wakeup = ax25_write_wakeup;
-
-	if ((status = tty_register_ldisc(N_AX25, &ax_ldisc)) != 0)
-		printk(KERN_ERR "mkiss: can't register line discipline (err = %d)\n", status);
-
-	mkiss_init();
-
-#ifdef MODULE
-	return status;
-#else
-	/*
-	 * Return "not found", so that dev_init() will unlink
-	 * the placeholder device entry for us.
-	 */
-	return ENODEV;
-#endif
-}
-
-
-/* Initialize the driver.  Called by network startup. */
-
-static int ax25_init(struct device *dev)
-{
-	struct ax_disp *ax = (struct ax_disp*)dev->priv;
-
-	static char ax25_bcast[AX25_ADDR_LEN] =
-		{'Q'<<1,'S'<<1,'T'<<1,' '<<1,' '<<1,' '<<1,'0'<<1};
-	static char ax25_test[AX25_ADDR_LEN] =
-		{'L'<<1,'I'<<1,'N'<<1,'U'<<1,'X'<<1,' '<<1,'1'<<1};
-
-	if (ax == NULL)		/* Allocation failed ?? */
-		return -ENODEV;
-
-	/* Set up the "AX25 Control Block". (And clear statistics) */
-	memset(ax, 0, sizeof (struct ax_disp));
-	ax->magic  = AX25_MAGIC;
-	ax->dev	   = dev;
-
-	/* Finish setting up the DEVICE info. */
-	dev->mtu             = AX_MTU;
-	dev->hard_start_xmit = ax_xmit;
-	dev->open            = ax_open_dev;
-	dev->stop            = ax_close;
-	dev->get_stats	     = ax_get_stats;
-#ifdef HAVE_SET_MAC_ADDR
-	dev->set_mac_address = ax_set_dev_mac_address;
-#endif
-	dev->hard_header_len = 0;
-	dev->addr_len        = 0;
-	dev->type            = ARPHRD_AX25;
-	dev->tx_queue_len    = 10;
-
-	memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
-	memcpy(dev->dev_addr,  ax25_test,  AX25_ADDR_LEN);
-
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-	dev->hard_header     = ax_header;
-	dev->rebuild_header  = ax_rebuild_header;
-#endif
-
-	dev_init_buffers(dev);
-
-	/* New-style flags. */
-	dev->flags      = 0;
-
-	return 0;
-}
-
-static int mkiss_open(struct tty_struct *tty, struct file *filp)
-{
-	struct mkiss_channel *mkiss;
-	int chan;
-
-	chan = MINOR(tty->device) - tty->driver.minor_start;
-
-	if (chan < 0 || chan >= NR_MKISS)
-		return -ENODEV;
-
-	mkiss = &MKISS_Info[chan];
-
-	mkiss->magic =  MKISS_DRIVER_MAGIC;
-	mkiss->init  = 1;
-	mkiss->tty   = tty;
-
-	tty->driver_data = mkiss;
-
-	tty->termios->c_iflag  = IGNBRK | IGNPAR;
-	tty->termios->c_cflag  = B9600 | CS8 | CLOCAL;
-	tty->termios->c_cflag &= ~CBAUD;
-
-	return 0;
-}
-
-static void mkiss_close(struct tty_struct *tty, struct file * filp)
-{
-	struct mkiss_channel *mkiss = tty->driver_data;
-
-	if (mkiss == NULL || mkiss->magic != MKISS_DRIVER_MAGIC)
-                return;
-
-	mkiss->tty   = NULL;
-	mkiss->init  = 0;
-	tty->stopped = 0;
-}
-
-static int mkiss_write(struct tty_struct *tty, int from_user, const unsigned char *buf, int count)
-{
-	return 0;
-}
-
-static int mkiss_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
-{
-	/* Ignore serial ioctl's */
-	switch (cmd) {
-		case TCSBRK:
-		case TIOCMGET:
-		case TIOCMBIS:
-		case TIOCMBIC:
-		case TIOCMSET:
-		case TCSETS:
-		case TCSETSF:		/* should flush first, but... */
-		case TCSETSW:		/* should wait until flush, but... */
-			return 0;
-		default:
-			return -ENOIOCTLCMD;
-	}
-}
-
-
-static void mkiss_dummy(struct tty_struct *tty)
-{
-	struct mkiss_channel *mkiss = tty->driver_data;
-
-	if (tty == NULL)
-		return;
-
-	if (mkiss == NULL)
-		return;
-}
-
-static void mkiss_dummy2(struct tty_struct *tty, unsigned char ch)
-{
-	struct mkiss_channel *mkiss = tty->driver_data;
-
-	if (tty == NULL)
-		return;
-
-	if (mkiss == NULL)
-		return;
-}
-
-
-static int mkiss_write_room(struct tty_struct * tty)
-{
-	struct mkiss_channel *mkiss = tty->driver_data;
-
-	if (tty == NULL)
-		return 0;
-
-	if (mkiss == NULL)
-		return 0;
-
-	return 65536;  /* We can handle an infinite amount of data. :-) */
-}
-
-
-static int mkiss_chars_in_buffer(struct tty_struct *tty)
-{
-	struct mkiss_channel *mkiss = tty->driver_data;
-
-	if (tty == NULL)
-		return 0;
-
-	if (mkiss == NULL)
-		return 0;
-
-	return 0;
-}
-
-
-static void mkiss_set_termios(struct tty_struct *tty, struct termios *old_termios)
-{
-	/* we don't do termios */
-}
-
-/* ******************************************************************** */
-/* * 			Init MKISS driver 			      * */
-/* ******************************************************************** */
-
-__initfunc(static int mkiss_init(void))
-{
-	memset(&mkiss_driver, 0, sizeof(struct tty_driver));
-
-	mkiss_driver.magic       = MKISS_DRIVER_MAGIC;
-	mkiss_driver.name        = "mkiss";
-	mkiss_driver.major       = MKISS_MAJOR;
-	mkiss_driver.minor_start = 0;
-	mkiss_driver.num         = NR_MKISS;
-	mkiss_driver.type        = TTY_DRIVER_TYPE_SERIAL;
-	mkiss_driver.subtype     = MKISS_SERIAL_TYPE_NORMAL;	/* not needed */
-
-	mkiss_driver.init_termios         = tty_std_termios;
-	mkiss_driver.init_termios.c_iflag = IGNBRK | IGNPAR;
-	mkiss_driver.init_termios.c_cflag = B9600 | CS8 | CLOCAL;
-
-	mkiss_driver.flags           = TTY_DRIVER_REAL_RAW;
-	mkiss_driver.refcount        = &mkiss_refcount;
-	mkiss_driver.table           = mkiss_table;
-	mkiss_driver.termios         = (struct termios **)mkiss_termios;
-	mkiss_driver.termios_locked  = (struct termios **)mkiss_termios_locked;
-
-	mkiss_driver.ioctl           = mkiss_ioctl;
-	mkiss_driver.open            = mkiss_open;
-	mkiss_driver.close           = mkiss_close;
-	mkiss_driver.write           = mkiss_write;
-	mkiss_driver.write_room      = mkiss_write_room;
-	mkiss_driver.chars_in_buffer = mkiss_chars_in_buffer;
-	mkiss_driver.set_termios     = mkiss_set_termios;
-
-	/* some unused functions */
-	mkiss_driver.flush_buffer = mkiss_dummy;
-	mkiss_driver.throttle     = mkiss_dummy;
-	mkiss_driver.unthrottle   = mkiss_dummy;
-	mkiss_driver.stop         = mkiss_dummy;
-	mkiss_driver.start        = mkiss_dummy;
-	mkiss_driver.hangup       = mkiss_dummy;
-	mkiss_driver.flush_chars  = mkiss_dummy;
-	mkiss_driver.put_char     = mkiss_dummy2;
-
-	if (tty_register_driver(&mkiss_driver)) {
-		printk(KERN_ERR "mkiss: couldn't register Mkiss device\n");
-		return -EIO;
-	}
-
-	printk(KERN_INFO "AX.25 Multikiss device enabled\n");
-
-	return 0;
-}
-
-#ifdef MODULE
-EXPORT_NO_SYMBOLS;
-
-MODULE_PARM(ax25_maxdev, "i");
-MODULE_PARM_DESC(ax25_maxdev, "number of MKISS devices");
-
-MODULE_AUTHOR("Hans Albas PE1AYX <hans@esrac.ele.tue.nl>");
-MODULE_DESCRIPTION("KISS driver for AX.25 over TTYs");
-
-int init_module(void)
-{
-	return mkiss_init_ctrl_dev();
-}
-
-void cleanup_module(void)
-{
-	int i;
-
-	if (ax25_ctrls != NULL) {
-		for (i = 0; i < ax25_maxdev; i++) {
-			if (ax25_ctrls[i]) {
-				/*
-				 * VSV = if dev->start==0, then device
-				 * unregistred while close proc.
-				 */
-				if (ax25_ctrls[i]->dev.start)
-					unregister_netdev(&(ax25_ctrls[i]->dev));
-
-				kfree(ax25_ctrls[i]);
-				ax25_ctrls[i] = NULL;
-			}
-		}
-
-		kfree(ax25_ctrls);
-		ax25_ctrls = NULL;
-	}
-
-	if ((i = tty_register_ldisc(N_AX25, NULL)))
-		printk(KERN_ERR "mkiss: can't unregister line discipline (err = %d)\n", i);
-
-	if (tty_unregister_driver(&mkiss_driver))	/* remove devive */
-		printk(KERN_ERR "mkiss: can't unregister MKISS device\n");
-}
-
-#endif /* MODULE */
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