/* * Synchronous PPP / Cisco-HDLC driver for the COMX boards * * Author: Gergely Madarasz <gorgo@itc.hu> * * based on skeleton code by Tivadar Szemethy <tiv@itc.hu> * * Copyright (C) 1999 ITConsult-Pro Co. <info@itc.hu> * * 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. * * * Version 0.10 (99/06/10): *		- written the first code :) * * Version 0.20 (99/06/16): *		- added hdlc protocol  *		- protocol up is IFF_RUNNING * * Version 0.21 (99/07/15): *		- some small fixes with the line status * * Version 0.22 (99/08/05): *		- don't test IFF_RUNNING but the pp_link_state of the sppp *  * Version 0.23 (99/12/02): *		- tbusy fixes * */#define VERSION "0.23"#include <linux/module.h>#include <linux/version.h>#include <linux/types.h>#include <linux/sched.h>#include <linux/netdevice.h>#include <linux/proc_fs.h>#include <linux/if_arp.h>#include <linux/inetdevice.h>#include <asm/uaccess.h>#include <linux/init.h>#include	"syncppp.h"#include	"comx.h"MODULE_AUTHOR("Author: Gergely Madarasz <gorgo@itc.hu>");MODULE_DESCRIPTION("Cisco-HDLC / Synchronous PPP driver for the COMX sync serial boards");static struct comx_protocol syncppp_protocol;static struct comx_protocol hdlc_protocol;struct syncppp_data {	struct timer_list status_timer;};static void syncppp_status_timerfun(unsigned long d) {	struct net_device *dev=(struct net_device *)d;	struct comx_channel *ch=dev->priv;	struct syncppp_data *spch=ch->LINE_privdata;	struct sppp *sp = (struct sppp *)sppp_of(dev);        	if(!(ch->line_status & PROTO_UP) && 	    (sp->pp_link_state==SPPP_LINK_UP)) {    		comx_status(dev, ch->line_status | PROTO_UP);	}	if((ch->line_status & PROTO_UP) &&	    (sp->pp_link_state==SPPP_LINK_DOWN)) {	    	comx_status(dev, ch->line_status & ~PROTO_UP);	}	mod_timer(&spch->status_timer,jiffies + HZ*3);}static int syncppp_tx(struct net_device *dev) {	struct comx_channel *ch=dev->priv;		if(ch->line_status & LINE_UP) {		netif_wake_queue(dev);	}	return 0;}static void syncppp_status(struct net_device *dev, unsigned short status){	status &= ~(PROTO_UP | PROTO_LOOP);	if(status & LINE_UP) {		netif_wake_queue(dev);		sppp_open(dev);	} else 	{		/* Line went down */		netif_stop_queue(dev);		sppp_close(dev);	}	comx_status(dev, status);}static int syncppp_open(struct net_device *dev){	struct comx_channel *ch = dev->priv;	struct syncppp_data *spch = ch->LINE_privdata;	if (!(ch->init_status & HW_OPEN)) return -ENODEV;	ch->init_status |= LINE_OPEN;	ch->line_status &= ~(PROTO_UP | PROTO_LOOP);	if(ch->line_status & LINE_UP) {		sppp_open(dev);	}	init_timer(&spch->status_timer);	spch->status_timer.function=syncppp_status_timerfun;	spch->status_timer.data=(unsigned long)dev;	spch->status_timer.expires=jiffies + HZ*3;	add_timer(&spch->status_timer);		return 0;}static int syncppp_close(struct net_device *dev){	struct comx_channel *ch = dev->priv;	struct syncppp_data *spch = ch->LINE_privdata;	if (!(ch->init_status & HW_OPEN)) return -ENODEV;	del_timer(&spch->status_timer);		sppp_close(dev);	ch->init_status &= ~LINE_OPEN;	ch->line_status &= ~(PROTO_UP | PROTO_LOOP);	return 0;}static int syncppp_xmit(struct sk_buff *skb, struct net_device *dev){	struct comx_channel *ch = dev->priv;	netif_stop_queue(dev);	switch(ch->HW_send_packet(dev, skb)) {		case FRAME_QUEUED:			netif_wake_queue(dev);			break;		case FRAME_ACCEPTED:		case FRAME_DROPPED:			break;		case FRAME_ERROR:			printk(KERN_ERR "%s: Transmit frame error (len %d)\n", 				dev->name, skb->len);		break;	}	return 0;}static int syncppp_statistics(struct net_device *dev, char *page) {	int len = 0;	len += sprintf(page + len, " ");	return len;}static int syncppp_exit(struct net_device *dev) {	struct comx_channel *ch = dev->priv;	sppp_detach(dev);	dev->flags = 0;	dev->type = 0;	dev->mtu = 0;	ch->LINE_rx = NULL;	ch->LINE_tx = NULL;	ch->LINE_status = NULL;	ch->LINE_open = NULL;	ch->LINE_close = NULL;	ch->LINE_xmit = NULL;	ch->LINE_header	= NULL;	ch->LINE_rebuild_header	= NULL;	ch->LINE_statistics = NULL;	kfree(ch->LINE_privdata);	ch->LINE_privdata = NULL;	MOD_DEC_USE_COUNT;	return 0;}static int syncppp_init(struct net_device *dev){	struct comx_channel *ch = dev->priv;	struct ppp_device *pppdev = (struct ppp_device *)ch->if_ptr;	ch->LINE_privdata = kmalloc(sizeof(struct syncppp_data), GFP_KERNEL);	if (!ch->LINE_privdata)		return -ENOMEM;	pppdev->dev = dev;	sppp_attach(pppdev);	if(ch->protocol == &hdlc_protocol) {		pppdev->sppp.pp_flags |= PP_CISCO;		dev->type = ARPHRD_HDLC;	} else {		pppdev->sppp.pp_flags &= ~PP_CISCO;		dev->type = ARPHRD_PPP;	}	ch->LINE_rx = sppp_input;	ch->LINE_tx = syncppp_tx;	ch->LINE_status = syncppp_status;	ch->LINE_open = syncppp_open;	ch->LINE_close = syncppp_close;	ch->LINE_xmit = syncppp_xmit;	ch->LINE_header	= NULL;	ch->LINE_statistics = syncppp_statistics;	MOD_INC_USE_COUNT;	return 0;}static struct comx_protocol syncppp_protocol = {	"ppp", 	VERSION,	ARPHRD_PPP, 	syncppp_init, 	syncppp_exit, 	NULL };static struct comx_protocol hdlc_protocol = {	"hdlc", 	VERSION,	ARPHRD_PPP, 	syncppp_init, 	syncppp_exit, 	NULL };#ifdef MODULE#define comx_proto_ppp_init init_module#endifint __init comx_proto_ppp_init(void){	int ret;	if(0!=(ret=comx_register_protocol(&hdlc_protocol))) {		return ret;	}	return comx_register_protocol(&syncppp_protocol);}#ifdef MODULEvoid cleanup_module(void){	comx_unregister_protocol(syncppp_protocol.name);	comx_unregister_protocol(hdlc_protocol.name);}#endif /* MODULE */