/* $Id: isdn_ttyfax.c,v 1.4 1999/09/21 19:00:35 armin Exp $
 * Linux ISDN subsystem, tty_fax AT-command emulator (linklevel).
 *
 * Copyright 1999    by Armin Schindler (mac@melware.de)
 * Copyright 1999    by Ralf Spachmann (mel@melware.de)
 * Copyright 1999    by Cytronics & Melware 
 *
 * 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Log: isdn_ttyfax.c,v $
 * Revision 1.4  1999/09/21 19:00:35  armin
 * Extended FCON message with added CPN
 * can now be activated with Bit 1 of Reg 23.
 *
 * Revision 1.3  1999/08/22 20:26:12  calle
 * backported changes from kernel 2.3.14:
 * - several #include "config.h" gone, others come.
 * - "struct device" changed to "struct net_device" in 2.3.14, added a
 *   define in isdn_compat.h for older kernel versions.
 *
 * Revision 1.2  1999/08/05 10:36:10  armin
 * Bugfix: kernel oops on getting revision.
 *
 * Revision 1.1  1999/07/31 12:59:50  armin
 * Added tty fax capabilities.
 *
 *
 */

#undef ISDN_TTY_FAX_STAT_DEBUG
#undef ISDN_TTY_FAX_CMD_DEBUG

#define __NO_VERSION__
#include <linux/module.h>
#include <linux/isdn.h>
#include "isdn_common.h"
#include "isdn_tty.h"
#include "isdn_ttyfax.h"


static char *isdn_tty_fax_revision = "$Revision: 1.4 $";

#define PARSE_ERROR1 { isdn_tty_fax_modem_result(1, info); return 1; }

static char *
isdn_getrev(const char *revision)
{
        char *rev;
        char *p;

        if ((p = strchr(revision, ':'))) {
                rev = p + 2;
                p = strchr(rev, '$');
                *--p = 0;
        } else
                rev = "???";
        return rev;
}


/*
 * Fax Class 2 Modem results
 *
 */
static void isdn_tty_fax_modem_result(int code, modem_info * info)
{
	atemu *m = &info->emu;
	T30_s *f = info->fax;
	char rs[50];
	char rss[50];
	char *rp;
	int i;
	static char *msg[] =
	{"OK", "ERROR", "+FCON", "+FCSI:", "+FDIS:",
	 "+FHNG:", "+FDCS:", "CONNECT", "+FTSI:",
	 "+FCFR", "+FPTS:", "+FET:" };


	isdn_tty_at_cout("\r\n", info);
	isdn_tty_at_cout(msg[code], info);

#ifdef ISDN_TTY_FAX_CMD_DEBUG
	printk(KERN_DEBUG "isdn_tty: Fax send %s on ttyI%d\n",
		msg[code], info->line);
#endif
	switch (code) {
		case 0: /* OK */
			break;
		case 1: /* ERROR */
			break;
		case 2:	/* +FCON */
			/* Append CPN, if enabled */
			if ((m->mdmreg[REG_CPN] & BIT_CPNFCON) &&
				(!(dev->usage[info->isdn_channel] & ISDN_USAGE_OUTGOING))) {
				sprintf(rs, "/%s", m->cpn);
				isdn_tty_at_cout(rs, info);
			}
			info->online = 1;
			f->fet = 0;
			if (f->phase == ISDN_FAX_PHASE_A)
				f->phase = ISDN_FAX_PHASE_B;
			break;
		case 3:	/* +FCSI */
		case 8:	/* +FTSI */
			sprintf(rs, "\"%s\"", f->r_id);
			isdn_tty_at_cout(rs, info); 
			break;
		case 4:	/* +FDIS */
			rs[0] = 0;
			rp = &f->r_resolution;
			for(i = 0; i < 8; i++) {
				sprintf(rss, "%c%s", rp[i] + 48,
					(i < 7) ? "," : "");
				strcat(rs, rss);
			}
			isdn_tty_at_cout(rs, info);
#ifdef ISDN_TTY_FAX_CMD_DEBUG
			printk(KERN_DEBUG "isdn_tty: Fax DIS=%s on ttyI%d\n",
				rs, info->line);
#endif
			break;
		case 5:	/* +FHNG */
			sprintf(rs, "%d", f->code);
			isdn_tty_at_cout(rs, info); 
			info->faxonline = 0;
			break;
		case 6:	/* +FDCS */
			rs[0] = 0;
			rp = &f->r_resolution;
			for(i = 0; i < 8; i++) {
				sprintf(rss, "%c%s", rp[i] + 48,
					(i < 7) ? "," : "");
				strcat(rs, rss);
			}
			isdn_tty_at_cout(rs, info);
#ifdef ISDN_TTY_FAX_CMD_DEBUG
			printk(KERN_DEBUG "isdn_tty: Fax DCS=%s on ttyI%d\n",
				rs, info->line);
#endif
			break;
		case 7:	/* CONNECT */
			info->faxonline |= 2;
			break;
		case 9: /* FCFR */
			break;
		case 10: /* FPTS */
			isdn_tty_at_cout("1", info);
			break;
		case 11: /* FET */
			sprintf(rs, "%d", f->fet);
			isdn_tty_at_cout(rs, info); 
			break;
	}

	isdn_tty_at_cout("\r\n", info);

	switch (code) {
		case 7: /* CONNECT */
			info->online = 2;
			if (info->faxonline & 1) {
				sprintf(rs, "%c", XON);
				isdn_tty_at_cout(rs, info); 
			}
			break;
	}
}

int
isdn_tty_fax_command(modem_info * info)
{
	T30_s *f = info->fax;
	char rs[10];

#ifdef ISDN_TTY_FAX_CMD_DEBUG
	printk(KERN_DEBUG "isdn_tty: Fax cmd %d on ttyI%d\n",
		f->r_code, info->line);
#endif
	switch(f->r_code) {
		case ISDN_TTY_FAX_FCON:
			info->faxonline = 1;
			isdn_tty_fax_modem_result(2, info); /* +FCON */
			return(0);
		case ISDN_TTY_FAX_FCON_I:
			info->faxonline = 16;
			isdn_tty_fax_modem_result(2, info); /* +FCON */
			return(0);
		case ISDN_TTY_FAX_RID:
			if (info->faxonline & 1)
				isdn_tty_fax_modem_result(3, info); /* +FCSI */
			if (info->faxonline & 16)
				isdn_tty_fax_modem_result(8, info); /* +FTSI */
			return(0);
		case ISDN_TTY_FAX_DIS:
			isdn_tty_fax_modem_result(4, info); /* +FDIS */
			return(0);
		case ISDN_TTY_FAX_HNG:
			if (f->phase == ISDN_FAX_PHASE_C) {
				if (f->direction == ISDN_TTY_FAX_CONN_IN) {
					sprintf(rs, "%c%c", DLE, ETX);
					isdn_tty_at_cout(rs, info); 
				} else {
					sprintf(rs, "%c", 0x18);
					isdn_tty_at_cout(rs, info); 
				}
				info->faxonline &= ~2; /* leave data mode */
				info->online = 1;
			}
			f->phase = ISDN_FAX_PHASE_E;
			isdn_tty_fax_modem_result(5, info); /* +FHNG */
			isdn_tty_fax_modem_result(0, info); /* OK */
			return(0);
		case ISDN_TTY_FAX_DCS:
			isdn_tty_fax_modem_result(6, info); /* +FDCS */
			isdn_tty_fax_modem_result(7, info); /* CONNECT */
			f->phase = ISDN_FAX_PHASE_C;
			return(0);
		case ISDN_TTY_FAX_TRAIN_OK:
			isdn_tty_fax_modem_result(6, info); /* +FDCS */
			isdn_tty_fax_modem_result(0, info); /* OK */
			return(0);
		case ISDN_TTY_FAX_SENT:
			isdn_tty_fax_modem_result(0, info); /* OK */
			return(0);
		case ISDN_TTY_FAX_CFR:
			isdn_tty_fax_modem_result(9, info); /* +FCFR */
			return(0);
		case ISDN_TTY_FAX_ET:
			sprintf(rs, "%c%c", DLE, ETX);
			isdn_tty_at_cout(rs, info); 
			isdn_tty_fax_modem_result(10, info); /* +FPTS */
			isdn_tty_fax_modem_result(11, info); /* +FET */
			isdn_tty_fax_modem_result(0, info); /* OK */
			info->faxonline &= ~2; /* leave data mode */
			info->online = 1;
			f->phase = ISDN_FAX_PHASE_D;
			return(0);
		case ISDN_TTY_FAX_PTS:
			isdn_tty_fax_modem_result(10, info); /* +FPTS */
			if (f->direction == ISDN_TTY_FAX_CONN_OUT) {
				if (f->fet == 1)
					f->phase = ISDN_FAX_PHASE_B;
				if (f->fet == 0)
					isdn_tty_fax_modem_result(0, info); /* OK */
			}
			return(0);
		case ISDN_TTY_FAX_EOP:
			info->faxonline &= ~2; /* leave data mode */
			info->online = 1;
			f->phase = ISDN_FAX_PHASE_D;
			return(0);

	}
	return(-1);
}


void
isdn_tty_fax_bitorder(modem_info *info, struct sk_buff *skb)
{
	__u8 LeftMask;
	__u8 RightMask;
	__u8 fBit;
	__u8 Data;
	int i;

	if (!info->fax->bor) {
		for(i = 0; i < skb->len; i++) {
			Data = skb->data[i];
			for (
				LeftMask = 0x80, RightMask = 0x01;
				LeftMask > RightMask;
				LeftMask >>= 1, RightMask <<= 1
			) {
				fBit = (Data & LeftMask);
				if (Data & RightMask)
					Data |= LeftMask;
				else
					Data &= ~LeftMask;
				if (fBit)
					Data |= RightMask;
				else
					Data &= ~RightMask;

			}
			skb->data[i] = Data;
		}
	}
}

/*
 * Parse AT+F.. FAX class 2 commands
 */

int isdn_tty_cmd_PLUSF_FAX(char **p, modem_info * info)
{
	atemu *m = &info->emu;
	T30_s *f = info->fax;
	isdn_ctrl cmd;
	int par;
	char rs[50];
	char rss[50];
	int maxdccval[]={1,5,2,2,3,2,0,7};

	/* FAA still unchanged */
        if (!strncmp(p[0], "AA", 2)) { /* TODO */
		p[0] += 2;
		switch (*p[0]) {
			case '?':
				p[0]++;
				sprintf(rs, "\r\n%d", 0);
				isdn_tty_at_cout(rs, info);
				break;
			case '=':
				p[0]++;
				par = isdn_getnum(p);
				if ((par < 0) || (par > 255))
					PARSE_ERROR1;
				break;
			default:
				PARSE_ERROR1;
		}
		return 0;
       }

	/* BADLIN=value - dummy 0=disable errorchk disabled, 1-255 nr. of lines for making page bad */
        if (!strncmp(p[0], "BADLIN", 6)) {
            p[0] += 6;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d",f->badlin);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                {
                                     p[0]++;
                                     sprintf(rs, "\r\n0-255");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 255))
                                            PARSE_ERROR1;
                                        f->badlin = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FBADLIN=%d\n", par);
#endif
                                    }
                                break;
			default:
			        PARSE_ERROR1;
		}
                return 0;
        }

	/* BADMUL=value - dummy 0=disable errorchk disabled (treshold multiplier) */
        if (!strncmp(p[0], "BADMUL", 6)){
            p[0] +=6;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d", f->badmul);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0-255");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 255))
                                            PARSE_ERROR1;
                                        f->badmul = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FBADMUL=%d\n", par);
#endif
                                    }
                                    break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }

	/* BOR=n - Phase C bit order, 0=direct, 1=reverse */
        if (!strncmp(p[0], "BOR", 3)){
            p[0] +=3;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d", f->bor);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0,1");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 1))
                                            PARSE_ERROR1;
                                        f->bor = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FBOR=%d\n", par);
#endif
                                    }
                                break;
                        default:
                                PARSE_ERROR1;
                                }
                       return 0;
        }

	/* NBC=n - No Best Capabilities */
        if (!strncmp(p[0], "NBC", 3)){
            p[0] +=3;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d", f->nbc);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0,1");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 1))
                                            PARSE_ERROR1;
                                        f->nbc = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FNBC=%d\n", par);
#endif
                                    }
                                break;
                        default:
                                PARSE_ERROR1;
                                }
                       return 0;
        }

	/* BUF? - Readonly buffersize readout  */
        if (!strncmp(p[0], "BUF?", 4)) {
                p[0] += 4;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                printk(KERN_DEBUG "isdn_tty: Fax FBUF? (%d) \n", (16 * m->mdmreg[REG_PSIZE]));
#endif
                                p[0]++;
                                 sprintf(rs, "\r\n %d ", (16 * m->mdmreg[REG_PSIZE]));
                                isdn_tty_at_cout(rs, info);
                return 0;
        }
        
	/* CIG=string - local fax station id string for polling rx */
        if (!strncmp(p[0], "CIG", 3)) {
		int i, r;
                p[0] += 3;
		switch (*p[0]) {
			case '?':
				p[0]++;
				sprintf(rs, "\r\n\"%s\"", f->pollid);
                                isdn_tty_at_cout(rs, info);
                                break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n\"STRING\"");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        if (*p[0] =='"')
                                            p[0]++;
                                        for(i=0; (*p[0]) && i < (FAXIDLEN-1) && (*p[0] != '"'); i++)
                                        {
                                            f->pollid[i] = *p[0]++;
                                        }
                                        if (*p[0] =='"')
                                            p[0]++;
                                        for(r=i; r < FAXIDLEN; r++)
                                        {
                                        	f->pollid[r] = 32;
                                        }
                                        f->pollid[FAXIDLEN-1] = 0;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                       printk(KERN_DEBUG "isdn_tty: Fax local poll ID rx \"%s\"\n", f->pollid);
#endif
                                    }
                                break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }

	/* CQ=n - copy qlty chk, 0= no chk, 1=only 1D chk, 2=1D+2D chk */
        if (!strncmp(p[0], "CQ", 2)) {
                p[0] += 2;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d", f->cq);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0,1,2");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 2))
                                            PARSE_ERROR1;
                                        f->cq = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FCQ=%d\n", par);
#endif
                                    }
                                    break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }

	/* CR=n - can receive? 0= no data rx or poll remote dev, 1=do receive data or poll remote dev */
        if (!strncmp(p[0], "CR", 2)) {
                p[0] += 2;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d", f->cr); /* read actual value from struct and print */
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0,1"); /* display online help */
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 1))
                                            PARSE_ERROR1;
                                        f->cr = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FCR=%d\n", par);
#endif
                                    }
                                    break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }

	/* CTCRTY=value - ECM retry count */
        if (!strncmp(p[0], "CTCRTY", 6)){
            p[0] +=6;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d",f->ctcrty);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0-255");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 255))
                                            PARSE_ERROR1;
                                        f->ctcrty = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FCTCRTY=%d\n", par);
#endif
                                    }
                                    break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }

	/* DCC=vr,br,wd,ln,df,ec,bf,st - DCE capabilities parms */
        if (!strncmp(p[0], "DCC", 3)) {
		char *rp = &f->resolution;
		int i;

                p[0] += 3;
		switch(*p[0]) {
			case '?':
				p[0]++;
	                        strcpy(rs, "\r\n");
	                        for(i = 0; i < 8; i++) {
        	                        sprintf(rss, "%c%s", rp[i] + 48,
                	                        (i < 7) ? "," : "");
                        	        strcat(rs, rss);
	                        }
        	                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
		                if (*p[0] == '?') {
					isdn_tty_at_cout("\r\n(0,1),(0-5),(0-2),(0-2),(0-3),(0-2),(0),(0-7)",info);
                                	p[0]++;
		                } else {
					for (i=0; (((*p[0]>='0')&&(*p[0]<='9'))||(*p[0]==','))&&(i<8); i++) {
						if (*p[0] != ',') {
							if ((*p[0] - 48) > maxdccval[i]) {
								PARSE_ERROR1;
							}
							rp[i] = *p[0] - 48;
							p[0]++;
							if (*p[0] == ',') 
								p[0]++;
						} else p[0]++;
					}
#ifdef ISDN_TTY_FAX_STAT_DEBUG
				printk(KERN_DEBUG "isdn_tty: Fax FDCC capabilities DCE=%d,%d,%d,%d,%d,%d,%d,%d\n",
				       rp[0], rp[1], rp[2], rp[3], rp[4], rp[5], rp[6], rp[7]);
#endif
        		        }
				break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }
       
	/* DIS=vr,br,wd,ln,df,ec,bf,st - current session parms */
        if (!strncmp(p[0], "DIS", 3)) {
		char *rp = &f->resolution;
		int i;

                p[0] += 3;
		switch(*p[0]) {
			case '?':
				p[0]++;
	                        strcpy(rs, "\r\n");
	                        for(i = 0; i < 8; i++) {
        	                        sprintf(rss, "%c%s", rp[i] + 48,
                	                        (i < 7) ? "," : "");
                        	        strcat(rs, rss);
	                        }
        	                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
		                if (*p[0] == '?') {
					isdn_tty_at_cout("\r\n(0,1),(0-5),(0-2),(0-2),(0-3),(0-2),(0),(0-7)",info);
                                	p[0]++;
		                } else {
					for (i=0; (((*p[0]>='0')&&(*p[0]<='9'))||(*p[0]==','))&&(i<8); i++) {
						if (*p[0] != ',') {
							if ((*p[0] - 48) > maxdccval[i]) {
								PARSE_ERROR1;
							}
							rp[i] = *p[0] - 48;
							p[0]++;
							if (*p[0] == ',') 
								p[0]++;
						} else p[0]++;
					}
#ifdef ISDN_TTY_FAX_STAT_DEBUG
				printk(KERN_DEBUG "isdn_tty: Fax FDIS session parms=%d,%d,%d,%d,%d,%d,%d,%d\n",
				       rp[0], rp[1], rp[2], rp[3], rp[4], rp[5], rp[6], rp[7]);
#endif
        		        }
				break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }
       
	/* DR - Receive Phase C data command, initiates document reception */ 
        if (!strncmp(p[0], "DR", 2)) {
                p[0] += 2;
		if ((info->faxonline & 16) &&	/* incoming connection */
   		   ((f->phase == ISDN_FAX_PHASE_B) || (f->phase == ISDN_FAX_PHASE_D))) {
#ifdef ISDN_TTY_FAX_STAT_DEBUG
			printk(KERN_DEBUG "isdn_tty: Fax FDR\n");
#endif
			f->code = ISDN_TTY_FAX_DR;
			cmd.driver = info->isdn_driver;
			cmd.arg = info->isdn_channel;
			cmd.command = ISDN_CMD_FAXCMD;
			isdn_command(&cmd);
			if (f->phase == ISDN_FAX_PHASE_B) {
				f->phase = ISDN_FAX_PHASE_C;
			} else if (f->phase == ISDN_FAX_PHASE_D) { 
				switch(f->fet) {
					case 0:	/* next page will be received */
						f->phase = ISDN_FAX_PHASE_C;
						isdn_tty_fax_modem_result(7, info); /* CONNECT */
						break;
					case 1:	/* next doc will be received */
						f->phase = ISDN_FAX_PHASE_B;
						break;
					case 2:	/* fax session is terminating */
						f->phase = ISDN_FAX_PHASE_E;
						break;
					default:	
						PARSE_ERROR1;
				}
			}
		} else {
			PARSE_ERROR1;
		}
                return 1;
	}
 
	/* DT=df,vr,wd,ln - TX phase C data command (release DCE to proceed with negotiation) */
        if (!strncmp(p[0], "DT", 2)) {
		int i, val[]={4,0,2,3};
		char *rp = &f->resolution;

                p[0] += 2;
		if (!info->faxonline & 1) 	/* not outgoing connection */
			PARSE_ERROR1;

		for (i=0; (((*p[0]>='0')&&(*p[0]<='9'))||(*p[0]==','))&&(i<4); i++) {
			if (*p[0] != ',') {
				if ((*p[0] - 48) > maxdccval[val[i]]) {
					PARSE_ERROR1;
				}
				rp[val[i]] = *p[0] - 48;
				p[0]++;
				if (*p[0] == ',') 
					p[0]++;
			} else p[0]++;
		}
#ifdef ISDN_TTY_FAX_STAT_DEBUG
		printk(KERN_DEBUG "isdn_tty: Fax FDT tx data command parms=%d,%d,%d,%d\n",
		       rp[4], rp[0], rp[2], rp[3]);
#endif
		if ((f->phase == ISDN_FAX_PHASE_B) || (f->phase == ISDN_FAX_PHASE_D)) {
			f->code = ISDN_TTY_FAX_DT;
			cmd.driver = info->isdn_driver;
			cmd.arg = info->isdn_channel;
			cmd.command = ISDN_CMD_FAXCMD;
			isdn_command(&cmd);
			if (f->phase == ISDN_FAX_PHASE_D) {
				f->phase = ISDN_FAX_PHASE_C;
				isdn_tty_fax_modem_result(7, info); /* CONNECT */
			}
		} else {
			PARSE_ERROR1;
		}
                return 1;
        }

	/* ECM=n - Error mode control 0=disabled, 2=enabled, handled by DCE alone incl. buff of partial pages */
        if (!strncmp(p[0], "ECM", 3)) {
                p[0] += 3;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d",f->ecm);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0,2");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par != 0) && (par != 2))
                                            PARSE_ERROR1;
                                        f->ecm = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FECM=%d\n", par);
#endif
                                    }
                                    break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }

	/* ET=n - End of page or document */
	if (!strncmp(p[0], "ET=", 3)) {
		p[0] += 3;
		if (*p[0] == '?') {
			p[0]++;
			sprintf(rs, "\r\n0-2");
			isdn_tty_at_cout(rs, info);
		} else {
			if ((f->phase != ISDN_FAX_PHASE_D) || (!info->faxonline & 1))
				PARSE_ERROR1;
			par = isdn_getnum(p);
			if ((par < 0) || (par > 2))
				PARSE_ERROR1;
			f->fet = par;
			f->code = ISDN_TTY_FAX_ET;
			cmd.driver = info->isdn_driver;
			cmd.arg = info->isdn_channel;
			cmd.command = ISDN_CMD_FAXCMD;
			isdn_command(&cmd);
#ifdef ISDN_TTY_FAX_STAT_DEBUG
			printk(KERN_DEBUG "isdn_tty: Fax FET=%d\n", par);
#endif
			return 1;
		}
		return 0;
	}

	/* K - terminate */
	if (!strncmp(p[0], "K", 1)) {
		p[0] += 1;
		if ((f->phase == ISDN_FAX_PHASE_IDLE) || (f->phase == ISDN_FAX_PHASE_E))
			PARSE_ERROR1;
		isdn_tty_modem_hup(info, 1);
		return 1;
	}

	/* LID=string - local fax ID */
        if (!strncmp(p[0], "LID", 3)) {
		int i, r;
                p[0] += 3;
		switch (*p[0]) {
			case '?':
				p[0]++;
				sprintf(rs, "\r\n\"%s\"", f->id);
                                isdn_tty_at_cout(rs, info);
                                break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n\"STRING\"");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        if (*p[0] =='"')
                                            p[0]++;
                                        for(i=0; (*p[0]) && i < (FAXIDLEN-1) && (*p[0] != '"'); i++)
                                        {
                                            f->id[i] = *p[0]++;
                                        }
                                        if (*p[0] =='"')
                                            p[0]++;
                                        for(r=i; r < FAXIDLEN; r++)
                                        {
                                        	f->id[r] = 32;
                                        }
                                        f->id[FAXIDLEN-1] = 0;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                       printk(KERN_DEBUG "isdn_tty: Fax local ID \"%s\"\n", f->id);
#endif
                                    }
                                break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }


	/* MDL? - DCE Model       */
        if (!strncmp(p[0], "MDL?", 4)) {
                p[0] += 4;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                printk(KERN_DEBUG "isdn_tty: FMDL?\n");
#endif
                isdn_tty_at_cout("\r\nisdn4linux", info);
                return 0;
        }

	/* MFR? - DCE Manufacturer */
        if (!strncmp(p[0], "MFR?", 4)) {
                p[0] += 4;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                printk(KERN_DEBUG "isdn_tty: FMFR?\n");
#endif
                isdn_tty_at_cout("\r\nisdn4linux", info);
                return 0;
        }

	/* MINSP=n - Minimum Speed for Phase C */
        if (!strncmp(p[0], "MINSP", 5)) {
                p[0] += 5;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d",f->minsp);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0-5");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 5))
                                            PARSE_ERROR1;
                                        f->minsp = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FMINSP=%d\n", par);
#endif
                                    }
                                    break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }

	/* PHCTO=value - DTE phase C timeout */
        if (!strncmp(p[0], "PHCTO", 5)){
            p[0] +=5;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d",f->phcto);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0-255");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 255))
                                            PARSE_ERROR1;
                                        f->phcto = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FPHCTO=%d\n", par);
#endif
                                    }
                                    break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }


	/* REL=n - Phase C received EOL alignment */
        if (!strncmp(p[0], "REL", 3)) {
                p[0] += 3;
		switch (*p[0]) {
			case '?':
				p[0]++;
                                sprintf(rs, "\r\n%d",f->rel);
                                isdn_tty_at_cout(rs, info);
				break;
			case '=':
                                p[0]++;
                                if (*p[0] == '?')
                                    {
                                     p[0]++;
                                     sprintf(rs, "\r\n0,1");
                       		     isdn_tty_at_cout(rs, info);
                                    }
                                    else
                                    {
                                        par = isdn_getnum(p);
                                        if ((par < 0) || (par > 1))
                                            PARSE_ERROR1;
                                        f->rel = par;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                                        printk(KERN_DEBUG "isdn_tty: Fax FREL=%d\n", par);
#endif
                                    }
                                    break;
			default:
				PARSE_ERROR1;
		}
                return 0;
        }

	/* REV? - DCE Revision */
        if (!strncmp(p[0], "REV?", 4)) {
                p[0] += 4;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                printk(KERN_DEBUG "isdn_tty: FREV?\n");
#endif
		strcpy(rss, isdn_tty_fax_revision);
		sprintf(rs, "\r\nRev: %s", isdn_getrev(rss));
                isdn_tty_at_cout(rs, info);
                return 0;
        }


	/* Phase C Transmit Data Block Size */
	if (!strncmp(p[0], "TBC=", 4)) { /* dummy, not used */
		p[0] += 4;
#ifdef ISDN_TTY_FAX_STAT_DEBUG
                printk(KERN_DEBUG "isdn_tty: Fax FTBC=%c\n", *p[0]);
#endif
                switch (*p[0]) {
                        case '0':
                                p[0]++;
                                break;
                        default:
                                PARSE_ERROR1;
                }
                return 0;
	}

        printk(KERN_DEBUG "isdn_tty: unknown token=>AT+F%s<\n", p[0]);
	PARSE_ERROR1;
}