/***************************************************************************
                              lib/ibppc.c
                             -------------------

    begin                : Oct 2002
    copyright            : (C) 2002 by Frank Mori Hess
    email                : fmhess@users.sourceforge.net
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "ib_internal.h"
#include <stdlib.h>

int ppoll_configure_device(ibConf_t *conf, const Addr4882_t addressList[],
	int ppc_configuration)
{
	uint8_t *cmd;
	int i;
	int retval;

	retval = is_cic(interfaceBoard(conf));
	if (retval <= 0) {
		if (retval == 0)
			setIberr(ECIC);
		return -1;
	}

	cmd = malloc(16 + 2 * numAddresses(addressList));
	if (!cmd) {
		setIberr(EDVR);
		setIbcnt(ENOMEM);
		return -1;
	}

	i = create_send_setup(interfaceBoard(conf), addressList, cmd);

	cmd[i++] = PPC;
	cmd[i++] = ppc_configuration;

	retval = my_ibcmd(conf, conf->settings.usec_timeout, cmd, i);

	free(cmd);
	cmd = NULL;

	if (retval < 0)
		return -1;

	return 0;
}

int device_ppc(ibConf_t *conf, int ppc_configuration)
{
	Addr4882_t addressList[2];

	addressList[0] = packAddress(conf->settings.pad, conf->settings.sad);
	addressList [1] = NOADDR;

	return ppoll_configure_device(conf, addressList, ppc_configuration);
}

int board_ppc(ibConf_t *conf, int ppc_configuration)
{
	ibBoard_t *board;
	int retval;
	struct gpib_ppoll_config_ioctl cmd;

	board = interfaceBoard(conf);

	// check if we are in local ppoll configuration mode
	retval = query_local_ppoll_mode(board);
	if (retval < 0)
		return retval;
	if (retval == 0) {
		setIberr(ECAP);
		return -1;
	}

	retval = query_ppc(board);
	if (retval < 0)
		return retval;
	conf->settings.ppoll_config = retval;	// store old value

	cmd.config = ppc_configuration;
	cmd.set_ist = 0;
	cmd.clear_ist = 0;
	retval = ioctl(board->fileno, IBPPC, &cmd);
	if (retval < 0) {
		setIberr(EDVR);
		setIbcnt(errno);
		return -1;
	}

	return 0;
}

int internal_ibppc(ibConf_t *conf, int v)
{
	static const int ppc_mask = 0xe0;
	int retval;

	if (v && (v & ppc_mask) != PPE)	{
		fprintf(stderr, "libgpib: illegal parallel poll configuration\n");
		setIberr(EARG);
		return -1;
	}

	if (!v || (v & PPC_DISABLE))
		v = PPD;

	if (conf->is_interface)	{
		retval = board_ppc(conf, v);
		if (retval < 0)
			return retval;
	} else {
		retval = device_ppc(conf, v);
		if (retval < 0)
			return retval;
	}

	setIberr(conf->settings.ppoll_config);
	conf->settings.ppoll_config = v;

	return 0;
}

int ibppc(int ud, int v)
{
	ibConf_t *conf;
	int retval;

	conf = enter_library(ud);
	if (!conf)
		return exit_library(ud, 1);

	retval = internal_ibppc(conf, v);
	if (retval < 0)
		return exit_library(ud, 1);

	return exit_library(ud, 0);
}

void PPollConfig(int boardID, Addr4882_t address,
	int dataLine, int lineSense)
{
	ibConf_t *conf;
	int retval;
	int ppoll_config;
	Addr4882_t addressList[2];

	conf = enter_library(boardID);
	if (!conf) {
		exit_library(boardID, 1);
		return;
	}

	if (!conf->is_interface) {
		setIberr(EDVR);
		exit_library(boardID, 1);
		return;
	}

	if (dataLine < 1 || dataLine > 8 ||
		!addressIsValid(address) || address == NOADDR) {
		setIberr(EARG);
		exit_library(boardID, 1);
		return;
	}

	ppoll_config = PPE_byte(dataLine, lineSense);

	addressList[0] = address;
	addressList[1]= NOADDR;
	retval = ppoll_configure_device(conf, addressList, ppoll_config);
	if (retval < 0)	{
		exit_library(boardID, 1);
		return;
	}

	exit_library(boardID, 0);
}

void PPollUnconfig(int boardID, const Addr4882_t addressList[])
{
	ibConf_t *conf;
	uint8_t cmd;
	int retval;

	conf = enter_library(boardID);
	if (!conf) {
		exit_library(boardID, 1);
		return;
	}

	if (!conf->is_interface) {
		setIberr(EDVR);
		exit_library(boardID, 1);
		return;
	}

	if (!addressListIsValid(addressList)) {
		setIberr(EARG);
		exit_library(boardID, 1);
		return;
	}

	if (numAddresses(addressList)) {
		retval = ppoll_configure_device(conf, addressList, PPD);
	} else {
		cmd = PPU;
		retval = my_ibcmd(conf, conf->settings.usec_timeout, &cmd, 1);
	}
	if (retval < 0)	{
		exit_library(boardID, 1);
		return;
	}

	exit_library(boardID, 0);
}

int internal_ibist(ibConf_t *conf, int ist)
{
	int retval;
	struct gpib_ppoll_config_ioctl cmd;

	if (!conf->is_interface) {
		setIberr(EARG);
		return -1;
	}

	retval = query_ist(interfaceBoard(conf));
	if (retval < 0)
		return retval;
	setIberr(retval);	// set iberr to old ist value

	cmd.config = 0;
	cmd.set_ist = 0;
	cmd.clear_ist = 0;
	if (ist)
		cmd.set_ist = 1;
	else
		cmd.clear_ist = 1;
	retval = ioctl(interfaceBoard(conf)->fileno, IBPPC, &cmd);
	if (retval < 0) {
		setIberr(EDVR);
		setIbcnt(errno);
		return -1;
	}

	return 0;
}

int ibist(int ud, int ist)
{
	ibConf_t *conf;
	int retval;

	conf = enter_library(ud);
	if (!conf)
		return exit_library(ud, 1);

	retval = internal_ibist(conf, ist);
	if (retval < 0)
		return exit_library(ud, 1);

	return exit_library(ud, 0);
}