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freebsd-nq/sys/dev/ppbus/nlpt.c
Nicolas Souchu 71705a23fc - port of vpo code to CAM 
- ppbus was released before checking if still in disk_mode by vpoio and immio:
  the microseq (in_disk_mode) was never executed. Fixed.

- nlptintr() renamed to nlpt_intr(). spltty() inserted in nlptintr() before
  nlpt_intr() call
1998-09-20 14:41:54 +00:00

842 lines
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/*
* Copyright (c) 1990 William F. Jolitz, TeleMuse
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This software is a component of "386BSD" developed by
* William F. Jolitz, TeleMuse.
* 4. Neither the name of the developer nor the name "386BSD"
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
* NOT MAKE USE OF THIS WORK.
*
* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: unknown origin, 386BSD 0.1
* From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp
* $Id: nlpt.c,v 1.9 1998/08/03 19:14:31 msmith Exp $
*/
/*
* Device Driver for AT parallel printer port
* Written by William Jolitz 12/18/90
*/
/*
* Updated for ppbus by Nicolas Souchu
* [Mon Jul 28 1997]
*/
#ifdef KERNEL
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/uio.h>
#include <sys/syslog.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <sys/malloc.h>
#include <machine/clock.h>
#include <machine/lpt.h>
#endif /*KERNEL*/
#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/nlpt.h>
#ifndef NLPT_DEBUG
#define nlprintf (void)
#else
#define nlprintf if (nlptflag) printf
static int volatile nlptflag = 1;
#endif
#define LPINITRDY 4 /* wait up to 4 seconds for a ready */
#define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
#define LPTOUTMAX 1 /* maximal timeout 1 s */
#define LPPRI (PZERO+8)
#define BUFSIZE 1024
#define LPTUNIT(s) ((s)&0x03)
#define LPTFLAGS(s) ((s)&0xfc)
static int nlpt = 0;
#define MAXLPT 8 /* XXX not much better! */
static struct lpt_data *lptdata[MAXLPT];
#define LPT_NAME "nlpt" /* our official name */
static timeout_t nlptout;
static int nlpt_port_test(struct lpt_data *sc, u_char data, u_char mask);
static int nlpt_detect(struct lpt_data *sc);
/*
* Make ourselves visible as a ppbus driver
*/
static struct ppb_device *nlptprobe(struct ppb_data *ppb);
static int nlptattach(struct ppb_device *dev);
static void nlptintr(int unit);
static void nlpt_drvinit(void *unused);
static void nlpt_intr(int unit); /* without spls */
#ifdef KERNEL
static struct ppb_driver nlptdriver = {
nlptprobe, nlptattach, LPT_NAME
};
DATA_SET(ppbdriver_set, nlptdriver);
#endif /* KERNEL */
/* bits for state */
#define OPEN (1<<0) /* device is open */
#define ASLP (1<<1) /* awaiting draining of printer */
#define EERROR (1<<2) /* error was received from printer */
#define OBUSY (1<<3) /* printer is busy doing output */
#define LPTOUT (1<<4) /* timeout while not selected */
#define TOUT (1<<5) /* timeout while not selected */
#define LPTINIT (1<<6) /* waiting to initialize for open */
#define INTERRUPTED (1<<7) /* write call was interrupted */
#define HAVEBUS (1<<8) /* the driver owns the bus */
/* status masks to interrogate printer status */
#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
/* Printer Ready condition - from lpa.c */
/* Only used in polling code */
#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
#define NOT_READY(lpt) ((ppb_rstr(&(lpt)->lpt_dev)^LPS_INVERT)&LPS_MASK)
#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
#define MAX_SPIN 20 /* Max delay for device ready in usecs */
static d_open_t nlptopen;
static d_close_t nlptclose;
static d_write_t nlptwrite;
static d_ioctl_t nlptioctl;
#define CDEV_MAJOR 16
static struct cdevsw nlpt_cdevsw =
{ nlptopen, nlptclose, noread, nlptwrite, /*16*/
nlptioctl, nullstop, nullreset, nodevtotty, /* lpt */
seltrue, nommap, nostrat, LPT_NAME, NULL, -1 };
static int
lpt_request_ppbus(struct lpt_data *sc, int how)
{
int error;
/* we have the bus only if the request succeded */
if ((error = ppb_request_bus(&sc->lpt_dev, how)) == 0)
sc->sc_state |= HAVEBUS;
return (error);
}
static int
lpt_release_ppbus(struct lpt_data *sc)
{
int error;
/* we do not have the bus only if the request succeeded */
if ((error = ppb_release_bus(&sc->lpt_dev)) == 0)
sc->sc_state &= ~HAVEBUS;
return (error);
}
/*
* Internal routine to nlptprobe to do port tests of one byte value
*/
static int
nlpt_port_test(struct lpt_data *sc, u_char data, u_char mask)
{
int temp, timeout;
data = data & mask;
ppb_wdtr(&sc->lpt_dev, data);
timeout = 10000;
do {
DELAY(10);
temp = ppb_rdtr(&sc->lpt_dev) & mask;
}
while (temp != data && --timeout);
nlprintf("out=%x\tin=%x\ttout=%d\n", data, temp, timeout);
return (temp == data);
}
/*
* New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
* Based partially on Rod Grimes' printer probe
*
* Logic:
* 1) If no port address was given, use the bios detected ports
* and autodetect what ports the printers are on.
* 2) Otherwise, probe the data port at the address given,
* using the method in Rod Grimes' port probe.
* (Much code ripped off directly from Rod's probe.)
*
* Comments from Rod's probe:
* Logic:
* 1) You should be able to write to and read back the same value
* to the data port. Do an alternating zeros, alternating ones,
* walking zero, and walking one test to check for stuck bits.
*
* 2) You should be able to write to and read back the same value
* to the control port lower 5 bits, the upper 3 bits are reserved
* per the IBM PC technical reference manauls and different boards
* do different things with them. Do an alternating zeros, alternating
* ones, walking zero, and walking one test to check for stuck bits.
*
* Some printers drag the strobe line down when the are powered off
* so this bit has been masked out of the control port test.
*
* XXX Some printers may not like a fast pulse on init or strobe, I
* don't know at this point, if that becomes a problem these bits
* should be turned off in the mask byte for the control port test.
*
* We are finally left with a mask of 0x14, due to some printers
* being adamant about holding other bits high ........
*
* Before probing the control port, we write a 0 to the data port -
* If not, some printers chuck out garbage when the strobe line
* gets toggled.
*
* 3) Set the data and control ports to a value of 0
*
* This probe routine has been tested on Epson Lx-800, HP LJ3P,
* Epson FX-1170 and C.Itoh 8510RM
* printers.
* Quick exit on fail added.
*/
static int
nlpt_detect(struct lpt_data *sc)
{
int status;
u_char data;
u_char mask;
int i, error;
status = 1; /* assume success */
if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) {
printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
status = 0 ; goto end_probe ;
}
mask = 0xff;
data = 0x55; /* Alternating zeros */
if (!nlpt_port_test(sc, data, mask))
{ status = 0 ; goto end_probe ; }
data = 0xaa; /* Alternating ones */
if (!nlpt_port_test(sc, data, mask))
{ status = 0 ; goto end_probe ; }
for (i = 0; i < 8; i++) { /* Walking zero */
data = ~(1 << i);
if (!nlpt_port_test(sc, data, mask))
{ status = 0 ; goto end_probe ; }
}
for (i = 0; i < 8; i++) { /* Walking one */
data = (1 << i);
if (!nlpt_port_test(sc, data, mask))
{ status = 0 ; goto end_probe ; }
}
end_probe:
/* write 0's to control and data ports */
ppb_wdtr(&sc->lpt_dev, 0);
ppb_wctr(&sc->lpt_dev, 0);
lpt_release_ppbus(sc);
return (status);
}
/*
* nlptprobe()
*/
static struct ppb_device *
nlptprobe(struct ppb_data *ppb)
{
struct lpt_data *sc;
sc = (struct lpt_data *) malloc(sizeof(struct lpt_data),
M_TEMP, M_NOWAIT);
if (!sc) {
printf(LPT_NAME ": cannot malloc!\n");
return (0);
}
bzero(sc, sizeof(struct lpt_data));
lptdata[nlpt] = sc;
/*
* lpt dependent initialisation.
*/
sc->lpt_unit = nlpt;
/*
* ppbus dependent initialisation.
*/
sc->lpt_dev.id_unit = sc->lpt_unit;
sc->lpt_dev.name = nlptdriver.name;
sc->lpt_dev.ppb = ppb;
sc->lpt_dev.intr = nlptintr;
/*
* Now, try to detect the printer.
*/
if (!nlpt_detect(sc)) {
free(sc, M_TEMP);
return (0);
}
/* Ok, go to next device on next probe */
nlpt ++;
return (&sc->lpt_dev);
}
static int
nlptattach(struct ppb_device *dev)
{
struct lpt_data *sc = lptdata[dev->id_unit];
int error;
/*
* Report ourselves
*/
printf(LPT_NAME "%d: <generic printer> on ppbus %d\n",
dev->id_unit, dev->ppb->ppb_link->adapter_unit);
sc->sc_primed = 0; /* not primed yet */
if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) {
printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
return (0);
}
ppb_wctr(&sc->lpt_dev, LPC_NINIT);
/* check if we can use interrupt, should be done by ppc stuff */
nlprintf("oldirq %x\n", sc->sc_irq);
if (ppb_get_irq(&sc->lpt_dev)) {
sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
printf(LPT_NAME "%d: Interrupt-driven port\n", dev->id_unit);
} else {
sc->sc_irq = 0;
nlprintf(LPT_NAME "%d: Polled port\n", dev->id_unit);
}
nlprintf("irq %x\n", sc->sc_irq);
lpt_release_ppbus(sc);
#ifdef DEVFS
sc->devfs_token = devfs_add_devswf(&nlpt_cdevsw,
dev->id_unit, DV_CHR,
UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", dev->id_unit);
sc->devfs_token_ctl = devfs_add_devswf(&nlpt_cdevsw,
dev->id_unit | LP_BYPASS, DV_CHR,
UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", dev->id_unit);
#endif
return (1);
}
static void
nlptout(void *arg)
{
struct lpt_data *sc = arg;
int pl;
nlprintf ("T %x ", ppb_rstr(&sc->lpt_dev));
if (sc->sc_state & OPEN) {
sc->sc_backoff++;
if (sc->sc_backoff > hz/LPTOUTMAX)
sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
timeout(nlptout, (caddr_t)sc, sc->sc_backoff);
} else
sc->sc_state &= ~TOUT;
if (sc->sc_state & EERROR)
sc->sc_state &= ~EERROR;
/*
* Avoid possible hangs do to missed interrupts
*/
if (sc->sc_xfercnt) {
pl = spltty();
nlpt_intr(sc->lpt_unit);
splx(pl);
} else {
sc->sc_state &= ~OBUSY;
wakeup((caddr_t)sc);
}
}
/*
* nlptopen -- reset the printer, then wait until it's selected and not busy.
* If LP_BYPASS flag is selected, then we do not try to select the
* printer -- this is just used for passing ioctls.
*/
static int
nlptopen(dev_t dev, int flags, int fmt, struct proc *p)
{
struct lpt_data *sc;
int s;
int trys;
u_int unit = LPTUNIT(minor(dev));
if ((unit >= nlpt))
return (ENXIO);
sc = lptdata[unit];
if (sc->sc_state) {
nlprintf(LPT_NAME ": still open %x\n", sc->sc_state);
return(EBUSY);
} else
sc->sc_state |= LPTINIT;
sc->sc_flags = LPTFLAGS(minor(dev));
/* Check for open with BYPASS flag set. */
if (sc->sc_flags & LP_BYPASS) {
sc->sc_state = OPEN;
return(0);
}
/* request the ppbus only if we don't have it already */
if ((sc->sc_state & HAVEBUS) == 0 &&
lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR))
return (EINTR);
s = spltty();
nlprintf(LPT_NAME " flags 0x%x\n", sc->sc_flags);
/* set IRQ status according to ENABLE_IRQ flag */
if (sc->sc_irq & LP_ENABLE_IRQ)
sc->sc_irq |= LP_USE_IRQ;
else
sc->sc_irq &= ~LP_USE_IRQ;
/* init printer */
if ((sc->sc_flags & LP_NO_PRIME) == 0) {
if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
ppb_wctr(&sc->lpt_dev, 0);
sc->sc_primed++;
DELAY(500);
}
}
ppb_wctr(&sc->lpt_dev, LPC_SEL|LPC_NINIT);
/* wait till ready (printer running diagnostics) */
trys = 0;
do {
/* ran out of waiting for the printer */
if (trys++ >= LPINITRDY*4) {
splx(s);
sc->sc_state = 0;
nlprintf ("status %x\n", ppb_rstr(&sc->lpt_dev) );
lpt_release_ppbus(sc);
return (EBUSY);
}
/* wait 1/4 second, give up if we get a signal */
if (tsleep((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4) !=
EWOULDBLOCK) {
sc->sc_state = 0;
splx(s);
lpt_release_ppbus(sc);
return (EBUSY);
}
/* is printer online and ready for output */
} while ((ppb_rstr(&sc->lpt_dev) &
(LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
(LPS_SEL|LPS_NBSY|LPS_NERR));
sc->sc_control = LPC_SEL|LPC_NINIT;
if (sc->sc_flags & LP_AUTOLF)
sc->sc_control |= LPC_AUTOL;
/* enable interrupt if interrupt-driven */
if (sc->sc_irq & LP_USE_IRQ)
sc->sc_control |= LPC_ENA;
ppb_wctr(&sc->lpt_dev, sc->sc_control);
sc->sc_state = OPEN;
sc->sc_inbuf = geteblk(BUFSIZE);
sc->sc_xfercnt = 0;
splx(s);
/* release the ppbus */
lpt_release_ppbus(sc);
/* only use timeout if using interrupt */
nlprintf("irq %x\n", sc->sc_irq);
if (sc->sc_irq & LP_USE_IRQ) {
sc->sc_state |= TOUT;
timeout(nlptout, (caddr_t)sc,
(sc->sc_backoff = hz/LPTOUTINITIAL));
}
nlprintf("opened.\n");
return(0);
}
/*
* nlptclose -- close the device, free the local line buffer.
*
* Check for interrupted write call added.
*/
static int
nlptclose(dev_t dev, int flags, int fmt, struct proc *p)
{
struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))];
int err;
if(sc->sc_flags & LP_BYPASS)
goto end_close;
if ((sc->sc_state & HAVEBUS) == 0 &&
(err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)))
return (err);
sc->sc_state &= ~OPEN;
/* if the last write was interrupted, don't complete it */
if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
while ((ppb_rstr(&sc->lpt_dev) &
(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)
break;
ppb_wctr(&sc->lpt_dev, LPC_NINIT);
brelse(sc->sc_inbuf);
end_close:
/* release the bus anyway */
lpt_release_ppbus(sc);
sc->sc_state = 0;
sc->sc_xfercnt = 0;
nlprintf("closed.\n");
return(0);
}
/*
* nlpt_pushbytes()
* Workhorse for actually spinning and writing bytes to printer
* Derived from lpa.c
* Originally by ?
*
* This code is only used when we are polling the port
*/
static int
nlpt_pushbytes(struct lpt_data *sc)
{
int spin, err, tic;
char ch;
nlprintf("p");
/* loop for every character .. */
while (sc->sc_xfercnt > 0) {
/* printer data */
ch = *(sc->sc_cp);
sc->sc_cp++;
sc->sc_xfercnt--;
/*
* Wait for printer ready.
* Loop 20 usecs testing BUSY bit, then sleep
* for exponentially increasing timeout. (vak)
*/
for (spin = 0; NOT_READY(sc) && spin < MAX_SPIN; ++spin)
DELAY(1); /* XXX delay is NOT this accurate! */
if (spin >= MAX_SPIN) {
tic = 0;
while (NOT_READY(sc)) {
/*
* Now sleep, every cycle a
* little longer ..
*/
tic = tic + tic + 1;
/*
* But no more than 10 seconds. (vak)
*/
if (tic > MAX_SLEEP)
tic = MAX_SLEEP;
err = tsleep((caddr_t)sc, LPPRI,
LPT_NAME "poll", tic);
if (err != EWOULDBLOCK) {
return (err);
}
}
}
/* output data */
ppb_wdtr(&sc->lpt_dev, ch);
/* strobe */
ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB);
ppb_wctr(&sc->lpt_dev, sc->sc_control);
}
return(0);
}
/*
* nlptwrite --copy a line from user space to a local buffer, then call
* putc to get the chars moved to the output queue.
*
* Flagging of interrupted write added.
*/
static int
nlptwrite(dev_t dev, struct uio *uio, int ioflag)
{
register unsigned n;
int pl, err;
struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))];
if(sc->sc_flags & LP_BYPASS) {
/* we can't do writes in bypass mode */
return(EPERM);
}
/* request the ppbus only if we don't have it already */
if ((sc->sc_state & HAVEBUS) == 0 &&
lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR))
return (EINTR);
sc->sc_state &= ~INTERRUPTED;
while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
sc->sc_cp = sc->sc_inbuf->b_data ;
uiomove(sc->sc_cp, n, uio);
sc->sc_xfercnt = n ;
while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
nlprintf("i");
/* if the printer is ready for a char, */
/* give it one */
if ((sc->sc_state & OBUSY) == 0){
nlprintf("\nC %d. ", sc->sc_xfercnt);
pl = spltty();
nlpt_intr(sc->lpt_unit);
(void) splx(pl);
}
nlprintf("W ");
if (sc->sc_state & OBUSY)
if ((err = tsleep((caddr_t)sc,
LPPRI|PCATCH, LPT_NAME "write", 0))) {
sc->sc_state |= INTERRUPTED;
return(err);
}
}
/* check to see if we must do a polled write */
if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
nlprintf("p");
err = nlpt_pushbytes(sc);
if (err)
return(err);
}
}
/* we have not been interrupted, release the ppbus */
lpt_release_ppbus(sc);
return(0);
}
/*
* nlpt_intr -- handle printer interrupts which occur when the printer is
* ready to accept another char.
*
* do checking for interrupted write call.
*/
static void
nlpt_intr(int unit)
{
struct lpt_data *sc = lptdata[unit];
int sts;
int i;
/* we must own the bus to use it */
if ((sc->sc_state & HAVEBUS) == 0)
return;
/*
* Is printer online and ready for output?
*
* Avoid falling back to nlptout() too quickly. First spin-loop
* to see if the printer will become ready ``really soon now''.
*/
for (i = 0; i < 100 &&
((sts=ppb_rstr(&sc->lpt_dev)) & RDY_MASK) != LP_READY; i++) ;
if ((sts & RDY_MASK) == LP_READY) {
sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
sc->sc_backoff = hz/LPTOUTINITIAL;
if (sc->sc_xfercnt) {
/* send char */
/*nlprintf("%x ", *sc->sc_cp); */
ppb_wdtr(&sc->lpt_dev, *sc->sc_cp++) ;
ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB);
/* DELAY(X) */
ppb_wctr(&sc->lpt_dev, sc->sc_control);
/* any more data for printer */
if(--(sc->sc_xfercnt) > 0) return;
}
/*
* No more data waiting for printer.
* Wakeup is not done if write call was interrupted.
*/
sc->sc_state &= ~OBUSY;
if(!(sc->sc_state & INTERRUPTED))
wakeup((caddr_t)sc);
nlprintf("w ");
return;
} else { /* check for error */
if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
(sc->sc_state & OPEN))
sc->sc_state |= EERROR;
/* nlptout() will jump in and try to restart. */
}
nlprintf("sts %x ", sts);
}
static void
nlptintr(int unit)
{
/* call the interrupt at required spl level */
int s = spltty();
nlpt_intr(unit);
splx(s);
return;
}
static int
nlptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
int error = 0;
struct lpt_data *sc;
u_int unit = LPTUNIT(minor(dev));
u_char old_sc_irq; /* old printer IRQ status */
sc = lptdata[unit];
switch (cmd) {
case LPT_IRQ :
if(sc->sc_irq & LP_HAS_IRQ) {
/*
* NOTE:
* If the IRQ status is changed,
* this will only be visible on the
* next open.
*
* If interrupt status changes,
* this gets syslog'd.
*/
old_sc_irq = sc->sc_irq;
if(*(int*)data == 0)
sc->sc_irq &= (~LP_ENABLE_IRQ);
else
sc->sc_irq |= LP_ENABLE_IRQ;
if (old_sc_irq != sc->sc_irq )
log(LOG_NOTICE, LPT_NAME "%d: switched to %s mode\n",
unit,
(sc->sc_irq & LP_ENABLE_IRQ)?
"interrupt-driven":"polled");
} else /* polled port */
error = EOPNOTSUPP;
break;
default:
error = ENODEV;
}
return(error);
}
static nlpt_devsw_installed = 0;
static void
nlpt_drvinit(void *unused)
{
dev_t dev;
if( ! nlpt_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev,&nlpt_cdevsw, NULL);
nlpt_devsw_installed = 1;
}
}
SYSINIT(nlptdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,nlpt_drvinit,NULL)
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