int lpr_close(uint_fast8_t minor)
{
uint8_t b = 0x46;
if (minor == 0)
dw_transaction(&b, 1, NULL, 0, 0);
return 0;
}
/* Close a DriveWire port */
void dw_vclose( uint8_t minor){
struct dw_in *p=dw_gettab( minor );
unsigned char buf[3];
buf[0]=DW_SETSTAT;
buf[1]=dw_port( minor );
buf[2]=DW_VCLOSE;
if( p->flags & DW_FLG_OPEN ){
dw_transaction( buf, 3, NULL, 0 );
}
}
/* Open a DriveWire port */
void dw_vopen( uint8_t minor ){
struct dw_in *p=dw_gettab( minor );
unsigned char buf[3];
buf[0]=DW_SETSTAT;
buf[1]=dw_port( minor );
buf[2]=DW_VOPEN;
if( ! ( p->flags & DW_FLG_OPEN ) ){
dw_transaction( buf, 3, NULL, 0 );
open_ports++;
}
p->flags |= DW_FLG_OPEN;
}
int lpr_write(uint_fast8_t minor, uint_fast8_t rawflag, uint_fast8_t flag)
{
uint8_t *p = udata.u_base;
uint8_t *pe = p + udata.u_count;
int n;
irqflags_t irq;
uint8_t buf[2];
buf[0]=0x50;
if (minor == 0) {
while (p < pe) {
if ((n = iopoll(pe - p)) != 0)
return n;
buf[1] = ugetc(p++);
dw_transaction(buf, 2, NULL, 0, 0);
}
}
return udata.u_count;
}
/* (re) Initializes DW */
void dw_init( ){
unsigned char buf[2];
buf[0]=DW_INIT;
buf[1]=0x42;
dw_transaction( buf,2,buf,1 );
}
/* Poll and add chars (if any) to input q
*/
void dw_vpoll( ){
unsigned char buf[2];
int i;
/* don't waste time polling of no ports are open*/
if( ! open_ports ) return ;
/* check ticks - don't poll until our delay is done */
if( --wait ) return;
/* up to four transactions at a poll */
for( i=0; i<4; i++){
buf[0]=DW_SERREAD;
dw_transaction( buf, 1, buf, 2 );
/* nothing waiting ? */
if( ! (buf[0] & 0x7f) ) {
wait=MAX_WAIT;
break;
}
/* VSER Channel single datum */
if( buf[0]<16 ){
int minor=dw_minor( buf[0] - 1 );
tty_inproc( minor, buf[1] );
continue;
}
/* VSER Channel closed? */
if( buf[0] == 16 ){
int minor=dw_minor( buf[1] );
struct dw_in *p=dw_gettab( minor );
if( p->flags & DW_FLG_OPEN ){
p->flags &= ~DW_FLG_OPEN;
open_ports--;
if( ttydata[minor].users )
tty_carrier_drop( minor);
}
continue;
}
/* VSER channel multiple data */
if( buf[0] < 32 ){
int i;
unsigned char b[3];
int min;
int minor=dw_minor( buf[0]-17 );
b[0]=DW_SERREADM;
b[1]=buf[0]-17;
min=mini( buf[1], qfree( minor ) );
b[2]=min;
if( !min ){
wait=1;
break;
}
dw_transaction( b,3,tbuf, min );
for( i=0; i<min; i++){
tty_inproc( minor, tbuf[i] );
}
wait=1;
break;
}
/* VWIN channel single datum */
if( buf[0] < 144 ){
int minor=dw_minor( buf[0]-48 );
tty_inproc( minor, buf[1] );
continue;
}
/* something we don't handle? */
kprintf("out of band data\n");
}
}
/* Put a character to the DriveWire port */
void dw_putc( uint8_t minor, unsigned char c ){
unsigned char buf[2];
buf[0]=DW_FASTWRITE | dw_port( minor ) ;
buf[1]=c;
dw_transaction( buf, 2, NULL, 0 );
}
