ref: 60c34ebb2da2b9716169ae4e6db4816d02c28910
dir: /acme/bin/source/acd/mmc.c/
#include "acd.h"
int
msfconv(Fmt *fp)
{
Msf m;
m = va_arg(fp->args, Msf);
fmtprint(fp, "%d.%d.%d", m.m, m.s, m.f);
return 0;
}
static int
status(Drive *d)
{
uchar cmd[12];
memset(cmd, 0, sizeof cmd);
cmd[0] = 0xBD;
return scsi(d->scsi, cmd, sizeof cmd, nil, 0, Snone);
}
static int
playmsf(Drive *d, Msf start, Msf end)
{
uchar cmd[12];
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x47;
cmd[3] = start.m;
cmd[4] = start.s;
cmd[5] = start.f;
cmd[6] = end.m;
cmd[7] = end.s;
cmd[8] = end.f;
return scsi(d->scsi, cmd, sizeof cmd, nil, 0, Snone);
}
int
playtrack(Drive *d, int start, int end)
{
Toc *t;
t = &d->toc;
if(t->ntrack == 0)
return -1;
if(start < 0)
start = 0;
if(end >= t->ntrack)
end = t->ntrack-1;
if(end < start)
end = start;
return playmsf(d, t->track[start].start, t->track[end].end);
}
int
resume(Drive *d)
{
uchar cmd[12];
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x4B;
cmd[8] = 0x01;
return scsi(d->scsi, cmd, sizeof cmd, nil, 0, Snone);
}
int
pause(Drive *d)
{
uchar cmd[12];
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x4B;
return scsi(d->scsi, cmd, sizeof cmd, nil, 0, Snone);
}
int
stop(Drive *d)
{
uchar cmd[12];
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x4E;
return scsi(d->scsi, cmd, sizeof cmd, nil, 0, Snone);
}
int
eject(Drive *d)
{
uchar cmd[12];
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x1B;
cmd[1] = 1;
cmd[4] = 2;
return scsi(d->scsi, cmd, sizeof cmd, nil, 0, Snone);
}
int
ingest(Drive *d)
{
uchar cmd[12];
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x1B;
cmd[1] = 1;
cmd[4] = 3;
return scsi(d->scsi, cmd, sizeof cmd, nil, 0, Snone);
}
static Msf
rdmsf(uchar *p)
{
Msf msf;
msf.m = p[0];
msf.s = p[1];
msf.f = p[2];
return msf;
}
static ulong
rdlba(uchar *p)
{
return (p[0]<<16) | (p[1]<<8) | p[2];
}
/* not a Drive, so that we don't accidentally touch Drive.toc */
int
gettoc(Scsi *s, Toc *t)
{
int i, n;
uchar cmd[12];
uchar resp[1024];
Again:
memset(t, 0, sizeof(*t));
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x43;
cmd[1] = 0x02;
cmd[7] = sizeof(resp)>>8;
cmd[8] = sizeof(resp);
s->changetime = 1;
/* scsi sets nchange, changetime */
if(scsi(s, cmd, sizeof cmd, resp, sizeof(resp), Sread) < 4)
return -1;
if(s->changetime == 0) {
t->ntrack = 0;
werrstr("no media");
return -1;
}
if(t->nchange == s->nchange && t->changetime != 0)
return 0;
t->nchange = s->nchange;
t->changetime = s->changetime;
if(t->ntrack > MTRACK)
t->ntrack = MTRACK;
DPRINT(2, "%d %d\n", resp[3], resp[2]);
t->ntrack = resp[3]-resp[2]+1;
t->track0 = resp[2];
n = ((resp[0]<<8) | resp[1])+2;
if(n < 4+8*(t->ntrack+1)) {
werrstr("bad read0 %d %d", n, 4+8*(t->ntrack+1));
return -1;
}
for(i=0; i<=t->ntrack; i++) /* <=: track[ntrack] = end */
t->track[i].start = rdmsf(resp+4+i*8+5);
for(i=0; i<t->ntrack; i++)
t->track[i].end = t->track[i+1].start;
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x43;
cmd[7] = sizeof(resp)>>8;
cmd[8] = sizeof(resp);
if(scsi(s, cmd, sizeof cmd, resp, sizeof(resp), Sread) < 4)
return -1;
if(s->changetime != t->changetime || s->nchange != t->nchange) {
fprint(2, "disk changed underfoot; repeating\n");
goto Again;
}
n = ((resp[0]<<8) | resp[1])+2;
if(n < 4+8*(t->ntrack+1)) {
werrstr("bad read");
return -1;
}
for(i=0; i<=t->ntrack; i++)
t->track[i].bstart = rdlba(resp+4+i*8+5);
for(i=0; i<t->ntrack; i++)
t->track[i].bend = t->track[i+1].bstart;
return 0;
}
static void
dumptoc(Toc *t)
{
int i;
fprint(1, "%d tracks\n", t->ntrack);
for(i=0; i<t->ntrack; i++)
print("%d. %M-%M (%lud-%lud)\n", i+1,
t->track[i].start, t->track[i].end,
t->track[i].bstart, t->track[i].bend);
}
static void
ping(Drive *d)
{
uchar cmd[12];
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x43;
scsi(d->scsi, cmd, sizeof(cmd), nil, 0, Snone);
}
static int
playstatus(Drive *d, Cdstatus *stat)
{
uchar cmd[12], resp[16];
memset(cmd, 0, sizeof cmd);
cmd[0] = 0x42;
cmd[1] = 0x02;
cmd[2] = 0x40;
cmd[3] = 0x01;
cmd[7] = sizeof(resp)>>8;
cmd[8] = sizeof(resp);
if(scsi(d->scsi, cmd, sizeof(cmd), resp, sizeof(resp), Sread) < 0)
return -1;
switch(resp[1]){
case 0x11:
stat->state = Splaying;
break;
case 0x12:
stat->state = Spaused;
break;
case 0x13:
stat->state = Scompleted;
break;
case 0x14:
stat->state = Serror;
break;
case 0x00: /* not supported */
case 0x15: /* no current status to return */
default:
stat->state = Sunknown;
break;
}
stat->track = resp[6];
stat->index = resp[7];
stat->abs = rdmsf(resp+9);
stat->rel = rdmsf(resp+13);
return 0;
}
void
cdstatusproc(void *v)
{
Drive *d;
Toc t;
Cdstatus s;
t.changetime = ~0;
t.nchange = ~0;
threadsetname("cdstatusproc");
d = v;
DPRINT(2, "cdstatus %d\n", getpid());
for(;;) {
ping(d);
//DPRINT(2, "d %d %d t %d %d\n", d->scsi->changetime, d->scsi->nchange, t.changetime, t.nchange);
if(playstatus(d, &s) == 0)
send(d->cstatus, &s);
if(d->scsi->changetime != t.changetime || d->scsi->nchange != t.nchange) {
if(gettoc(d->scsi, &t) == 0) {
DPRINT(2, "sendtoc...\n");
if(debug) dumptoc(&t);
send(d->ctocdisp, &t);
} else
DPRINT(2, "error: %r\n");
}
sleep(1000);
}
}