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-rw-r--r--libusal/scsi-linux-pg.c587
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diff --git a/libusal/scsi-linux-pg.c b/libusal/scsi-linux-pg.c
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+/*
+ * 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
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