/*
* 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