/*
 *   libdi - scsipt SCSI Device Interface Library
 *
 *   Copyright (C) 1993-2001  Ti Kan
 *   E-mail: xmcd@amb.org
 *
 *   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.
 *
 *   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.
 */

/*
 *   SCO UNIX/Open Desktop/Open Server support
 *
 *   This software fragment contains code that interfaces the
 *   application to the SCO UNIX operating system.  The name "SCO" and
 *   "ODT" are used here for identification purposes only.
 */
#ifndef LINT
static char *_os_odt_c_ident_ = "@(#)os_odt.c	6.29 01/04/17";
#endif

#include "common_d/appenv.h"
#include "common_d/util.h"
#include "libdi_d/libdi.h"
#include "libdi_d/scsipt.h"

#if defined(sco) && defined(DI_SCSIPT) && !defined(DEMO_ONLY)

extern appdata_t	app_data;
extern bool_t		scsipt_notrom_error;
extern FILE		*errfp;
extern di_client_t	*di_clinfo;

STATIC req_sense_data_t	sense_data;	/* Request sense data buffer */


/*
 * pthru_send
 *	Send SCSI command to the device.
 *
 * Args:
 *	fd - Device file descriptor
 *	cmdpt - Pointer to the SCSI command CDB
 *	cmdlen - SCSI command size (6, 10 or 12 bytes)
 *	datapt - Pointer to the data buffer
 *	datalen - Data transfer size (bytes)
 *	rw - Data transfer direction flag (OP_NODATA, OP_DATAIN or OP_DATAOUT)
 *	tmout - Command timeout interval (seconds)
 *	prnerr - Whether an error message should be displayed
 *		 when a command fails
 *
 * Return:
 *	TRUE - command completed successfully
 *	FALSE - command failed
 */
/*ARGSUSED*/
bool_t
pthru_send(	
	int		fd,
	byte_t		*cmdpt,
	int		cmdlen,
	byte_t		*datapt,
	int		datalen,
	byte_t		rw,
	int		tmout,
	bool_t		prnerr
)
{
	struct scsicmd	sc;
	byte_t		*cdbp;
	char		*path,
			title[FILE_PATH_SZ + 20];
	
	if (fd < 0 || scsipt_notrom_error)
		return FALSE;

	path = di_devgetpath(fd);

	(void) memset(&sense_data, 0, sizeof(sense_data));
	(void) memset(&sc, 0, sizeof(sc));

	/* set up scsicmd */
	(void) memcpy(sc.cdb, cmdpt, cmdlen);
	sc.cdb_len = cmdlen;
	sc.data_ptr = (faddr_t) datapt;
	sc.data_len = datalen;
	sc.is_write = (rw == OP_DATAOUT);

	if (app_data.debug & DBG_DEVIO) {
		(void) sprintf(title, "SCSI CDB bytes (dev=%s rw=%d to=%d)",
			       path, rw, tmout);
		util_dbgdump(title, cmdpt, cmdlen);
	}

	/* Send the command down via the "pass-through" interface */
	if (ioctl(fd, SCSIUSERCMD, &sc) < 0) {
		if (app_data.scsierr_msg && prnerr)
			perror("SCSIUSERCMD ioctl failed");
		return FALSE;
	}

	if (sc.host_sts || sc.target_sts) {
		if (app_data.scsierr_msg && prnerr) {
			(void) fprintf(errfp,
				    "%s: %s %s:\n%s=0x%x %s=0x%x %s=0x%x",
				    APPNAME,
				    "SCSI command fault on",
				    path,
				    "Opcode",
				    cmdpt[0],
				    "Host_status",
				    sc.host_sts,
				    "Target_status",
				    sc.target_sts);
		}

		/* Send Request Sense command */
		cdbp = (byte_t *) sc.cdb;

		SCSICDB_RESET(cdbp);
		cdbp[0] = OP_S_RSENSE;
		cdbp[4] = SZ_RSENSE;
		sc.data_ptr = (faddr_t) &sense_data;
		sc.data_len = SZ_RSENSE;
		sc.is_write = FALSE;
		sc.cdb_len = 6;

		if (ioctl(fd, SCSIUSERCMD, &sc) < 0 ||
		    sense_data.key == 0) {
			if (app_data.scsierr_msg && prnerr)
				(void) fprintf(errfp, "\n");
		}
		else if (app_data.scsierr_msg && prnerr) {
			(void) fprintf(errfp, " Key=0x%x Code=0x%x Qual=0x%x\n",
				    sense_data.key,
				    sense_data.code,
				    sense_data.qual);
		}

		return FALSE;
	}
	return TRUE;
}


/*
 * pthru_open
 *	Open SCSI pass-through device
 *
 * Args:
 *	path - device path name string
 *
 * Return:
 *	Device file descriptor, or -1 on failure.
 */
int
pthru_open(char *path)
{
	int		fd;
	struct stat	stbuf;
	char		errstr[ERR_BUF_SZ];

	/* Check for validity of device node */
	if (stat(path, &stbuf) < 0) {
		(void) sprintf(errstr, app_data.str_staterr, path);
		DI_FATAL(errstr);
		return -1;
	}
	if (!S_ISCHR(stbuf.st_mode)) {
		(void) sprintf(errstr, app_data.str_noderr, path);
		DI_FATAL(errstr);
		return -1;
	}

	if ((fd = open(path, O_RDONLY | O_NONBLOCK)) < 0) {
		DBGPRN(DBG_DEVIO)(errfp,
			"Cannot open %s: errno=%d\n", path, errno);
		return -1;
	}

	(void) di_devreg(fd, path);

	/* SCO hack:  The CD-ROM driver may allow the open to succeed
	 * even if there is no CD loaded.  We test for the existence of
	 * a disc with scsipt_disc_present().
	 */
        if (!scsipt_disc_present(fd)) {
                /* No CD loaded */
                pthru_close(fd);
                return -1;
        }

	return (fd);
}


/*
 * pthru_close
 *	Close SCSI pass-through device
 *
 * Args:
 *	fd - Device file descriptor
 *
 * Return:
 *	Nothing.
 */
void
pthru_close(int fd)
{
	di_devunreg(fd);
	(void) close(fd);
}


/*
 * pthru_vers
 *	Return OS Interface Module version string
 *
 * Args:
 *	Nothing.
 *
 * Return:
 *	Module version text string.
 */
char *
pthru_vers(void)
{
	return ("OS Interface module for SCO UNIX");
}

#endif	/* sco DI_SCSIPT DEMO_ONLY */

