/*
 * scsi.c
 * Iomega Zip/Jaz drive tool
 * change protection mode and eject disk
 */

/* scis.c by Markus Gyger <mgyger@itr.ch> */
/* This code is based on ftp://gear.torque.net/pub/ziptool.c */
/* by Grant R. Guenther with the following copyright notice: */

/*  (c) 1996   Grant R. Guenther,  based on work of Itai Nahshon  */
/*  http://www.torque.net/ziptool.html  */


/* A.K. Moved this from mzip.c to a separate file in order to share with
 * plain_io.c */

#include "sysincludes.h"
#include "mtools.h"
#include "scsi.h"

#if defined OS_hpux
#include <sys/scsi.h>
#endif

#ifdef OS_solaris
#include <sys/scsi/scsi.h>
#endif /* solaris */

#ifdef OS_sunos
#include <scsi/generic/commands.h>
#include <scsi/impl/uscsi.h>
#endif /* sunos */

#ifdef sgi
#include <sys/dsreq.h>
#endif

#ifdef OS_linux
#define SCSI_IOCTL_SEND_COMMAND 1
struct scsi_ioctl_command {
    int  inlen;
    int  outlen;
    char cmd[5008];
};
#endif

#ifdef _SCO_DS
#include <sys/scsicmd.h>
#endif

#if (defined(OS_freebsd)) && (__FreeBSD__ >= 2)
#include <camlib.h>
#endif

int scsi_max_length(void)
{
#ifdef OS_linux
	return 8;
#else
	return 255;
#endif
}

int scsi_open(const char *name, int flag, int mode, void **extra_data)
{
#if (defined(OS_freebsd)) && (__FreeBSD__ >= 2)
    struct cam_device *cam_dev;
    cam_dev = cam_open_device(name, O_RDWR);
    *extra_data = (void *) cam_dev;
    if (cam_dev)
        return cam_dev->fd;
    else
        return -1;
#else
    return open(name, O_RDONLY
#ifdef O_NDELAY
		| O_NDELAY
#endif
	/* O_RDONLY  | dev->mode*/);
#endif
}

int scsi_cmd(int fd, unsigned char *cdb, int cmdlen, scsi_io_mode_t mode,
	     void *data, size_t len, void *extra_data)
{
#if defined OS_hpux
	struct sctl_io sctl_io;
	
	memset(&sctl_io, 0, sizeof sctl_io);   /* clear reserved fields */
	memcpy(sctl_io.cdb, cdb, cmdlen);      /* copy command */
	sctl_io.cdb_length = cmdlen;           /* command length */
	sctl_io.max_msecs = 2000;              /* allow 2 seconds for cmd */

	switch (mode) {
		case SCSI_IO_READ:
			sctl_io.flags = SCTL_READ;
			sctl_io.data_length = len;
			sctl_io.data = data;
			break;
		case SCSI_IO_WRITE: 
			sctl_io.flags = 0;
			sctl_io.data_length = data ? len : 0;
			sctl_io.data = len ? data : 0;
			break;
	}

	if (ioctl(fd, SIOC_IO, &sctl_io) == -1) {
		perror("scsi_io");
		return -1;
	}

	return sctl_io.cdb_status;
	
#elif defined OS_sunos || defined OS_solaris
	struct uscsi_cmd uscsi_cmd;
	memset(&uscsi_cmd, 0, sizeof uscsi_cmd);
	uscsi_cmd.uscsi_cdb = (char *)cdb;
	uscsi_cmd.uscsi_cdblen = cmdlen;
#ifdef OS_solaris
	uscsi_cmd.uscsi_timeout = 20;  /* msec? */
#endif /* solaris */
	
	uscsi_cmd.uscsi_buflen = (u_int)len;
	uscsi_cmd.uscsi_bufaddr = data;

	switch (mode) {
		case SCSI_IO_READ:
			uscsi_cmd.uscsi_flags = USCSI_READ;
			break;
		case SCSI_IO_WRITE:
			uscsi_cmd.uscsi_flags = USCSI_WRITE;
			break;
	}

	if (ioctl(fd, USCSICMD, &uscsi_cmd) == -1) {
		perror("scsi_io");
		return -1;
	}

	if(uscsi_cmd.uscsi_status) {
		errno = 0;
		fprintf(stderr,"scsi status=%x\n",  
			(unsigned short)uscsi_cmd.uscsi_status);
		return -1;
	}
	
	return 0;
	
#elif defined OS_linux
	struct scsi_ioctl_command scsi_cmd;


	memcpy(scsi_cmd.cmd, cdb, cmdlen);        /* copy command */

	switch (mode) {
		case SCSI_IO_READ:
			scsi_cmd.inlen = 0;
			scsi_cmd.outlen = len;
			break;
		case SCSI_IO_WRITE:
			scsi_cmd.inlen = len;
			scsi_cmd.outlen = 0;
			memcpy(scsi_cmd.cmd + cmdlen,data,len);
			break;
	}
	
	if (ioctl(fd, SCSI_IOCTL_SEND_COMMAND, &scsi_cmd) < 0) {
		perror("scsi_io");
		return -1;
	}
	
	switch (mode) {
		case SCSI_IO_READ:
			memcpy(data, &scsi_cmd.cmd[0], len);
			break;
		case SCSI_IO_WRITE:
			break;
    }

	return 0;  /* where to get scsi status? */

#elif defined _SCO_DS
	struct scsicmd scsi_cmd;

	memset(scsi_cmd.cdb, 0, SCSICMDLEN);	/* ensure zero pad */
	memcpy(scsi_cmd.cdb, cdb, cmdlen);
	scsi_cmd.cdb_len = cmdlen;
	scsi_cmd.data_len = len;
	scsi_cmd.data_ptr = data;
	scsi_cmd.is_write = mode == SCSI_IO_WRITE;
	if (ioctl(fd,SCSIUSERCMD,&scsi_cmd) == -1) {
		perror("scsi_io");
		printf("scsi status: host=%x; target=%x\n",
		(unsigned)scsi_cmd.host_sts,(unsigned)scsi_cmd.target_sts);
		return -1;
	}
	return 0;
#elif defined sgi
 	struct dsreq scsi_cmd;

	scsi_cmd.ds_cmdbuf = (char *)cdb;
	scsi_cmd.ds_cmdlen = cmdlen;
	scsi_cmd.ds_databuf = data;
	scsi_cmd.ds_datalen = len;
       	switch (mode) {
	case SCSI_IO_READ:
	  scsi_cmd.ds_flags = DSRQ_READ|DSRQ_SENSE;
	  break;
	case SCSI_IO_WRITE:
	  scsi_cmd.ds_flags = DSRQ_WRITE|DSRQ_SENSE;
	  break;
        } 
	scsi_cmd.ds_time = 10000;
	scsi_cmd.ds_link = 0;
	scsi_cmd.ds_synch =0;
	scsi_cmd.ds_ret =0;
	if (ioctl(fd, DS_ENTER, &scsi_cmd) == -1) {
                perror("scsi_io");
                return -1;
        }

        if(scsi_cmd.ds_status) {
                errno = 0;
                fprintf(stderr,"scsi status=%x\n",  
                        (unsigned short)scsi_cmd.ds_status);
                return -1;
        }
        
        return 0;
#elif (defined OS_freebsd) && (__FreeBSD__ >= 2)
#define MSG_SIMPLE_Q_TAG 0x20 /* O/O */
      union ccb *ccb;
      int flags;
      int r;
      struct cam_device *cam_dev = (struct cam_device *) extra_data;


      if (cam_dev==NULL || cam_dev->fd!=fd)
      {
                fprintf(stderr,"invalid file descriptor\n");
              return -1;
      }
      ccb = cam_getccb(cam_dev);

      bcopy(cdb, ccb->csio.cdb_io.cdb_bytes, cmdlen);

      if (mode == SCSI_IO_READ)
              flags = CAM_DIR_IN;
      else if (data && len)
              flags = CAM_DIR_OUT;
      else
              flags = CAM_DIR_NONE;
      cam_fill_csio(&ccb->csio,
                    /* retry */ 1,
                    /* cbfcnp */ NULL,
                    flags,
                    /* tag_action */ MSG_SIMPLE_Q_TAG,
                    /*data_ptr*/ len ? data : 0,
                    /*data_len */ data ? len : 0,
                    96,
                    cmdlen,
                    5000);
                    
      if (cam_send_ccb(cam_dev, ccb) < 0 ||
	  (ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
	  return -1;
      }
      return 0;
#else
      fprintf(stderr, "scsi_io not implemented\n");
      return -1;
#endif
}