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Gunter Jung's fixes for the much-maligned lpt driver

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This commit is contained in:
Jordan K. Hubbard 1994-02-06 22:06:58 +00:00
parent 1f17318c25
commit becfc6cb74
1 changed files with 48 additions and 46 deletions
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72
sys/i386/isa/lpt.c
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@ -46,7 +46,7 @@
* SUCH DAMAGE.
*
* from: unknown origin, 386BSD 0.1
* $Id: lpt.c,v 1.5 1993/10/16 13:46:10 rgrimes Exp $
* $Id: lpt.c,v 1.6 1993/11/25 01:31:41 wollman Exp $
*/
/*
@ -80,7 +80,6 @@
#define lprintf (void)
#else
#define lprintf if (lptflag) printf
int lptflag = 1;
#endif
void lptout();
@ -95,8 +94,8 @@ struct isa_driver lptdriver = {
lptprobe, lptattach, "lpt"
};
#define LPTUNIT(s) (((s)>>6)&0x3)
#define LPTFLAGS(s) ((s)&0x3f)
#define LPTUNIT(s) ((s)&0x03)
#define LPTFLAGS(s) ((s)&0xfc)
struct lpt_softc {
short sc_port;
@ -104,13 +103,13 @@ struct lpt_softc {
/* default case: negative prime, negative ack, handshake strobe,
prime once */
u_char sc_control;
char sc_flags;
#define LP_POS_INIT 0x01 /* if we are a postive init signal */
#define LP_POS_ACK 0x02 /* if we are a positive going ack */
#define LP_NO_PRIME 0x04 /* don't prime the printer at all */
#define LP_PRIMEOPEN 0x08 /* prime on every open */
#define LP_AUTOLF 0x10 /* tell printer to do an automatic lf */
#define LP_BYPASS 0x20 /* bypass printer ready checks */
u_char sc_flags;
#define LP_POS_INIT 0x04 /* if we are a postive init signal */
#define LP_POS_ACK 0x08 /* if we are a positive going ack */
#define LP_NO_PRIME 0x10 /* don't prime the printer at all */
#define LP_PRIMEOPEN 0x20 /* prime on every open */
#define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
#define LP_BYPASS 0x80 /* bypass printer ready checks */
struct buf *sc_inbuf;
short sc_xfercnt ;
char sc_primed;
@ -247,7 +246,6 @@ lptopen(dev, flag)
if (unit >= NLPT)
return (ENXIO);
sc = lpt_sc + unit;
if (sc->sc_state) {
lprintf("lp: still open\n") ;
lprintf("still open %x\n", sc->sc_state);
@ -281,8 +279,8 @@ lprintf ("status %x\n", inb(port+lpt_status) );
}
/* wait 1/4 second, give up if we get a signal */
if (tsleep ((caddr_t)sc, LPPRI|PCATCH, "lptinit",
hz/4) != EWOULDBLOCK) {
if (tsleep ((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4)
!= EWOULDBLOCK) {
sc->sc_state = 0;
splx(s);
return (EBUSY);
@ -351,8 +349,8 @@ lptclose(dev, flag)
while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
(LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
/* wait 1/4 second, give up if we get a signal */
if (tsleep ((caddr_t)sc, LPPRI|PCATCH,
"lpclose", hz) != EWOULDBLOCK)
if (tsleep ((caddr_t)sc, LPPRI|PCATCH, "lpclose", hz)
!= EWOULDBLOCK)
break;
sc->sc_state = 0;
@ -389,12 +387,14 @@ lprintf("\nC %d. ", sc->sc_xfercnt);
lptintr(sc - lpt_sc);
(void) splx(pl);
}
if (sc->sc_state & OBUSY) {
lprintf("W ");
if (err = tsleep ((caddr_t)sc, LPPRI|PCATCH,
"lpwrite", 0))
return(err);
}
}
}
return(0);
}
@ -408,35 +408,37 @@ lptintr(unit)
int unit;
{
struct lpt_softc *sc = lpt_sc + unit;
int port = sc->sc_port,sts;
int port = sc->sc_port,sts,lpc;
u_char ctrl = sc->sc_control & ~LPC_ENA;
/* is printer online and ready for output */
if (((sts=inb(port+lpt_status)) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR/*|LPS_NACK*/)) ==
(LPS_SEL|LPS_NBSY|LPS_NERR)) {
/* is this a false interrupt ? */
if ((sc->sc_state & OBUSY)
&& (sts & LPS_NACK) == 0) return;
sc->sc_state |= OBUSY; sc->sc_state &= ~ERROR;
sts = inb(port+lpt_status);
/* disable interupts */
outb(port+lpt_control, ctrl);
sc->sc_state |= OBUSY;
while(sc->sc_xfercnt > 0) {
lpc = 50;
/* wait for printer ready for output */
while(((inb(port+lpt_status)&(LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR))
!=(LPS_SEL|LPS_NBSY|LPS_NERR)) && --lpc);
if(lpc == 0) break;
if (sc->sc_xfercnt) {
/* send char */
/*lprintf("%x ", *sc->sc_cp); */
outb(port+lpt_data, *sc->sc_cp++) ; sc->sc_xfercnt-- ;
outb(port+lpt_control, sc->sc_control|LPC_STB);
/* DELAY(X) */
outb(port+lpt_control, sc->sc_control);
outb(port+lpt_control, ctrl|LPC_STB);
outb(port+lpt_control, ctrl);
}
/* any more bytes for the printer? */
if (sc->sc_xfercnt > 0) return;
if(sc->sc_xfercnt == 0) {
/* none, wake up the top half to get more */
sc->sc_state &= ~OBUSY;
wakeup((caddr_t)sc);
lprintf("w ");
return;
} else sc->sc_state |= ERROR;
lprintf("sts %x ", sts);
}
/* reenable interupts */
outb(port+lpt_control, sc->sc_control);
}
int