Logo Search packages:      
Sourcecode: cdrkit version File versions  Download package

scsi-linux-pg.c

/*
 * This file has been modified for the cdrkit suite.
 *
 * The behaviour and appearence of the program code below can differ to a major
 * extent from the version distributed by the original author(s).
 *
 * For details, see Changelog file distributed with the cdrkit package. If you
 * received this file from another source then ask the distributing person for
 * a log of modifications.
 *
 */

/* @(#)scsi-linux-pg.c  1.43 04/01/15 Copyright 1997 J. Schilling */
/*
 *    Interface for the Linux PARIDE implementation.
 *
 *    We emulate the functionality of the usal driver, via the pg driver.
 *
 *    Warning: you may change this source, but if you do that
 *    you need to change the _usal_version and _usal_auth* string below.
 *    You may not return "schily" for an SCG_AUTHOR request anymore.
 *    Choose your name instead of "schily" and make clear that the version
 *    string is related to a modified source.
 *
 *    Copyright (c) 1997  J. Schilling
 *    Copyright (c) 1998  Grant R. Guenther     <grant@torque.net>
 *                    Under the terms of the GNU public license.
 */
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * 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; see the file COPYING.  If not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <string.h>
#ifdef      HAVE_LINUX_PG_H
#include <linux/pg.h>
#else
#include "pg.h"         /* Use local version as Linux sometimes doesn't have */
#endif                  /* installed. Now libusal always supports PP SCSI    */

/*
 *    Warning: you may change this source, but if you do that
 *    you need to change the _usal_version and _usal_auth* string below.
 *    You may not return "schily" for an SCG_AUTHOR request anymore.
 *    Choose your name instead of "schily" and make clear that the version
 *    string is related to a modified source.
 */
static      char  _usal_trans_version_pg[] = "scsi-linux-pg.c-1.43";    /* The version for this transport*/

#ifdef      USE_PG_ONLY

#define     MAX_SCG           1     /* Max # of SCSI controllers */
#define     MAX_TGT           8
#define     MAX_LUN           8

struct usal_local {
      short usalfiles[MAX_SCG][MAX_TGT][MAX_LUN];
      short buscookies[MAX_SCG];
      int   pgbus;
      char  *SCSIbuf;
};
#define     usallocal(p)      ((struct usal_local *)((p)->local))

#else

#define     usalo_version     pg_version
#define     usalo_help  pg_help
#define     usalo_open  pg_open
#define     usalo_close pg_close
#define     usalo_send  pg_send
#define     usalo_maxdma      pg_maxdma
#define     usalo_initiator_id pg_initiator_id
#define     usalo_isatapi     pg_isatapi
#define     usalo_reset pg_reset

static      char  *pg_version(SCSI *usalp, int what);
static      int   pg_help(SCSI *usalp, FILE *f);
static      int   pg_open(SCSI *usalp, char *device);
static      int   pg_close(SCSI *usalp);
static      long  pg_maxdma(SCSI *usalp, long amt);
static      int   pg_initiator_id(SCSI *usalp);
static      int   pg_isatapi(SCSI *usalp);
static      int   pg_reset(SCSI *usalp, int what);
static      int   pg_send(SCSI *usalp);

#endif

static      int   do_usal_cmd(SCSI *usalp, struct usal_cmd *sp);
static      int   do_usal_sense(SCSI *usalp, struct usal_cmd *sp);


/*
 * Return version information for the low level SCSI transport code.
 * This has been introduced to make it easier to trace down problems
 * in applications.
 */
static char *
usalo_version(SCSI *usalp, int what)
{
      if (usalp != (SCSI *)0) {
            switch (what) {

            case SCG_VERSION:
                  return (_usal_trans_version_pg);
            /*
             * If you changed this source, you are not allowed to
             * return "schily" for the SCG_AUTHOR request.
             */
            case SCG_AUTHOR:
                  return (_usal_auth_cdrkit);
            case SCG_SCCS_ID:
                  return (___sccsid);
            }
      }
      return ((char *)0);
}

static int
usalo_help(SCSI *usalp, FILE *f)
{
      __usal_help(f, "pg", "SCSI transport for ATAPI over Parallel Port",
            "", "bus,target,lun", "1,2,0", TRUE, FALSE);
      return (0);
}

static int
usalo_open(SCSI *usalp, char *device)
{
            int   busno = usal_scsibus(usalp);
            int   tgt   = usal_target(usalp);
            int   tlun  = usal_lun(usalp);
      register int      f;
      register int      b;
#ifdef      USE_PG_ONLY
      register int      t;
      register int      l;
#endif
      register int      nopen = 0;
      char        devname[32];

      if (busno >= MAX_SCG || tgt >= MAX_TGT || tlun >= MAX_LUN) {
            errno = EINVAL;
            if (usalp->errstr)
                  snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                        "Illegal value for busno, target or lun '%d,%d,%d'",
                        busno, tgt, tlun);
            return (-1);
      }

#ifndef     USE_PG_ONLY
      /*
       * We need to find a fake bus number for the parallel port interface.
       * Unfortunatly, the buscookie array may contain holes if
       * SCSI_IOCTL_GET_BUS_NUMBER works, so we are searching backwards
       * for some place for us.
       * XXX Should add extra space in buscookies for a "PP bus".
       */

      if (usallocal(usalp)->buscookies[MAX_SCG-1] != (short)-1)
            return (0);             /* No space for pgbus */

      for (b = MAX_SCG-1; b >= 0; b--) {
            if (usallocal(usalp)->buscookies[b] != (short)-1) {
                  usallocal(usalp)->pgbus = ++b;
                  break;
            }
      }
      if (usalp->debug > 0) {
            fprintf((FILE *)usalp->errfile,
                  "PP Bus: %d\n", usallocal(usalp)->pgbus);
      }
#else
      if (usalp->local == NULL) {
            usalp->local = malloc(sizeof (struct usal_local));
            if (usalp->local == NULL)
                  return (0);

            usallocal(usalp)->pgbus = -2;
            usallocal(usalp)->SCSIbuf = (char *)-1;

            for (b = 0; b < MAX_SCG; b++) {
                  for (t = 0; t < MAX_TGT; t++) {
                        for (l = 0; l < MAX_LUN; l++)
                              usallocal(usalp)->usalfiles[b][t][l] = (short)-1;
                  }
            }
      }
#endif
      if (usallocal(usalp)->pgbus < 0)
            usallocal(usalp)->pgbus = 0;

      if ((device != NULL && *device != '\0') || (busno == -2 && tgt == -2))
            goto openbydev;

      if (busno >= 0 && tgt >= 0 && tlun >= 0) {
#ifndef     USE_PG_ONLY
            if (usallocal(usalp)->pgbus != busno)
                  return (0);
#endif
            snprintf(devname, sizeof (devname), "/dev/pg%d", tgt);
            f = sg_open_excl(devname, O_RDWR | O_NONBLOCK);
            if (f < 0) {
                  if (usalp->errstr)
                        snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                                    "Cannot open '%s'", devname);
                  return (0);
            }
            usallocal(usalp)->usalfiles[busno][tgt][tlun] = f;
            return (1);
      } else {
            tlun = 0;
            for (tgt = 0; tgt < MAX_TGT; tgt++) {
                  snprintf(devname, sizeof (devname), "/dev/pg%d", tgt);
                  f = sg_open_excl(devname, O_RDWR | O_NONBLOCK);
                  if (f < 0) {
                        /*
                         * Set up error string but let us clear it later
                         * if at least one open succeeded.
                         */
                        if (usalp->errstr)
                              snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                                          "Cannot open '/dev/pg*'");
                        if (errno != ENOENT && errno != ENXIO && errno != ENODEV) {
                              if (usalp->errstr)
                                    snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                                          "Cannot open '%s'", devname);
                              return (0);
                        }
                  } else {
                        usallocal(usalp)->usalfiles[usallocal(usalp)->pgbus][tgt][tlun] = f;
                        nopen++;
                  }
            }
      }
      if (nopen > 0 && usalp->errstr)
            usalp->errstr[0] = '\0';

openbydev:
      if (device != NULL && *device != '\0') {
            char  *p;

            if (tlun < 0)
                  return (0);
            f = open(device, O_RDWR | O_NONBLOCK);
/*          if (f < 0 && errno == ENOENT) {*/
            if (f < 0) {
                  if (usalp->errstr)
                        snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                              "Cannot open '%s'",
                              device);
                  return (0);
            }

            p = device + strlen(device) -1;
            tgt = *p - '0';
            if (tgt < 0 || tgt > 9)
                  return (0);
            usallocal(usalp)->usalfiles[usallocal(usalp)->pgbus][tgt][tlun] = f;
            usal_settarget(usalp, usallocal(usalp)->pgbus, tgt, tlun);

            return (++nopen);
      }
      return (nopen);
}

static int
usalo_close(SCSI *usalp)
{
      register int      f;
      register int      b;
      register int      t;
      register int      l;

      if (usalp->local == NULL)
            return (-1);
      if (usallocal(usalp)->pgbus < 0)
            return (0);
      b = usallocal(usalp)->pgbus;
      usallocal(usalp)->buscookies[b] = (short)-1;

      for (t = 0; t < MAX_TGT; t++) {
            for (l = 0; l < MAX_LUN; l++) {
                  f = usallocal(usalp)->usalfiles[b][t][l];
                  if (f >= 0)
                        close(f);
                  usallocal(usalp)->usalfiles[b][t][l] = (short)-1;
            }
      }
      return (0);
}

static long
usalo_maxdma(SCSI *usalp, long amt)
{
      return (PG_MAX_DATA);
}

#ifdef      USE_PG_ONLY

static void *
usalo_getbuf(SCSI *usalp, long amt)
{
      char    *ret;

      if (usalp->debug > 0) {
            fprintf((FILE *)usalp->errfile,
                  "usalo_getbuf: %ld bytes\n", amt);
      }
      ret = valloc((size_t)(amt+getpagesize()));
      if (ret == NULL)
            return (ret);
      usalp->bufbase = ret;
      ret += getpagesize();
      usallocal(usalp)->SCSIbuf = ret;
      return ((void *)ret);

}

static void
usalo_freebuf(SCSI *usalp)
{
      if (usalp->bufbase)
            free(usalp->bufbase);
      usalp->bufbase = NULL;
}

static BOOL
usalo_havebus(SCSI *usalp, int busno)
{
      register int      t;
      register int      l;

      if (busno < 0 || busno >= MAX_SCG)
            return (FALSE);

      if (usalp->local == NULL)
            return (FALSE);

      for (t = 0; t < MAX_TGT; t++) {
            for (l = 0; l < MAX_LUN; l++)
                  if (usallocal(usalp)->usalfiles[busno][t][l] >= 0)
                        return (TRUE);
      }
      return (FALSE);
}

static int
usalo_fileno(SCSI *usalp, int busno, int tgt, int tlun)
{
      if (busno < 0 || busno >= MAX_SCG ||
          tgt < 0 || tgt >= MAX_TGT ||
          tlun < 0 || tlun >= MAX_LUN)
            return (-1);

      if (usalp->local == NULL)
            return (-1);

      return ((int)usallocal(usalp)->usalfiles[busno][tgt][tlun]);
}
#endif      /* USE_PG_ONLY */

static int
usalo_initiator_id(SCSI *usalp)
{
      return (-1);
}

static int
usalo_isatapi(SCSI *usalp)
{
      return (TRUE);
}

static int
usalo_reset(SCSI *usalp, int what)
{
      struct pg_write_hdr hdr = {PG_MAGIC, PG_RESET, 0};

      if (what == SCG_RESET_NOP)
            return (0);
      if (what != SCG_RESET_BUS) {
            errno = EINVAL;
            return (-1);
      }
      /*
       * XXX Does this reset TGT or BUS ???
       */
      return (write(usalp->fd, (char *)&hdr, sizeof (hdr)));

}

#ifndef MAX
#define     MAX(a, b)   ((a) > (b) ? (a):(b))
#endif

#define     RHSIZE      sizeof (struct pg_read_hdr)
#define     WHSIZE  sizeof (struct pg_write_hdr)
#define     LEAD  MAX(RHSIZE, WHSIZE)

static int
do_usal_cmd(SCSI *usalp, struct usal_cmd *sp)
{

      char  local[LEAD+PG_MAX_DATA];
      int   use_local, i, r;
      int   inward = (sp->flags & SCG_RECV_DATA);

      struct pg_write_hdr *whp;
      struct pg_read_hdr  *rhp;
      char            *dbp;

      if (sp->cdb_len > 12)
            comerrno(EX_BAD, "Can't do %d byte command.\n", sp->cdb_len);

      if (sp->addr == usallocal(usalp)->SCSIbuf) {
            use_local = 0;
            dbp = sp->addr;
      } else {
            use_local = 1;
            dbp = &local[LEAD];
            if (!inward)
                  movebytes(sp->addr, dbp, sp->size);
      }

      whp = (struct pg_write_hdr *)(dbp - WHSIZE);
      rhp = (struct pg_read_hdr *)(dbp - RHSIZE);

      whp->magic   = PG_MAGIC;
      whp->func    = PG_COMMAND;
      whp->dlen    = sp->size;
      whp->timeout = sp->timeout;

      for (i = 0; i < 12; i++) {
            if (i < sp->cdb_len)
                  whp->packet[i] = sp->cdb.cmd_cdb[i];
            else
                  whp->packet[i] = 0;
      }

      i = WHSIZE;
      if (!inward)
            i += sp->size;

      r = write(usalp->fd, (char *)whp, i);

      if (r < 0) {                        /* command was not sent */
            sp->ux_errno = geterrno();
            if (sp->ux_errno == ETIME) {
                  /*
                   * If the previous command timed out, we cannot send
                   * any further command until the command in the drive
                   * is ready. So we behave as if the drive did not
                   * respond to the command.
                   */
                  sp->error = SCG_FATAL;
                  return (0);
            }
            return (-1);
      }

      if (r != i)
            errmsg("usalo_send(%s) wrote %d bytes (expected %d).\n",
                  usalp->cmdname, r, i);

      sp->ux_errno = 0;
      sp->sense_count = 0;

      r = read(usalp->fd, (char *)rhp, RHSIZE+sp->size);

      if (r < 0) {
            sp->ux_errno = geterrno();
            if (sp->ux_errno == ETIME) {
                  sp->error = SCG_TIMEOUT;
                  return (0);
            }
            sp->error = SCG_FATAL;
            return (-1);
      }

      i = rhp->dlen;
      if (i > sp->size) {
            /*
             * "DMA overrun" should be handled in the kernel.
             * However this may happen with flaky PP adapters.
             */
            errmsgno(EX_BAD,
                  "DMA (read) overrun by %d bytes (requested %d bytes).\n",
                  i - sp->size, sp->size);
            sp->resid = sp->size - i;
            sp->error = SCG_RETRYABLE;
            i = sp->size;
      } else {
            sp->resid = sp->size - i;
      }

      if (use_local && inward)
            movebytes(dbp, sp->addr, i);

      fillbytes(&sp->scb, sizeof (sp->scb), '\0');
      fillbytes(&sp->u_sense.cmd_sense, sizeof (sp->u_sense.cmd_sense), '\0');

      sp->error = SCG_NO_ERROR;
      i = rhp->scsi?2:0;
/*    i = rhp->scsi;*/
      sp->u_scb.cmd_scb[0] = i;
      if (i & 2) {
            if (sp->ux_errno == 0)
                  sp->ux_errno = EIO;
            /*
             * If there is no DMA overrun and there is a
             * SCSI Status byte != 0 then the SCSI cdb transport was OK
             * and sp->error must be SCG_NO_ERROR.
             */
/*          sp->error = SCG_RETRYABLE;*/
      }

      return (0);

}

static int
do_usal_sense(SCSI *usalp, struct usal_cmd *sp)
{
      int         ret;
      struct usal_cmd   s_cmd;

      fillbytes((caddr_t)&s_cmd, sizeof (s_cmd), '\0');
      s_cmd.addr = (caddr_t)sp->u_sense.cmd_sense;
      s_cmd.size = sp->sense_len;
      s_cmd.flags = SCG_RECV_DATA|SCG_DISRE_ENA;
      s_cmd.cdb_len = SC_G0_CDBLEN;
      s_cmd.sense_len = CCS_SENSE_LEN;
      s_cmd.cdb.g0_cdb.cmd = SC_REQUEST_SENSE;
      s_cmd.cdb.g0_cdb.lun = sp->cdb.g0_cdb.lun;
      s_cmd.cdb.g0_cdb.count = sp->sense_len;
      ret = do_usal_cmd(usalp, &s_cmd);

      if (ret < 0)
            return (ret);

      sp->sense_count = sp->sense_len - s_cmd.resid;
      return (ret);
}

static int
usalo_send(SCSI *usalp)
{
      struct usal_cmd   *sp = usalp->scmd;
      int   ret;

      if (usalp->fd < 0) {
            sp->error = SCG_FATAL;
            return (0);
      }
      ret = do_usal_cmd(usalp, sp);
      if (ret < 0)
            return (ret);
      if (sp->u_scb.cmd_scb[0] & 2)
            ret = do_usal_sense(usalp, sp);
      return (ret);
}

/* end of scsi-linux-pg.c */

#ifndef     USE_PG_ONLY

#undef      usalo_version
#undef      usalo_help
#undef      usalo_open
#undef      usalo_close
#undef      usalo_send
#undef      usalo_maxdma
#undef      usalo_initiator_id
#undef      usalo_isatapi
#undef      usalo_reset

#endif

Generated by  Doxygen 1.6.0   Back to index