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d6a0e38a1b
freebsd/sys/dev/ppbus/lpt.c
Poul-Henning Kamp d6a0e38a1b Remove five now unused fields from struct cdevsw. They should never 
have been there in the first place.  A GENERIC kernel shrinks almost 1k.

Add a slightly different safetybelt under nostop for tty drivers.

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1999-09-25 18:24:47 +00:00

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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
* From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp
* $FreeBSD$
*/
/*
* 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 <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>
#include <sys/malloc.h>
#include <machine/clock.h>
#include <machine/lpt.h>
#endif /*KERNEL*/
#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/ppb_1284.h>
#include <dev/ppbus/lpt.h>
#include "opt_lpt.h"
#ifndef LPT_DEBUG
#define lprintf(args)
#else
#define lprintf(args) \
do { \
if (lptflag) \
printf args; \
} while (0)
static int volatile lptflag = 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 BUFSTATSIZE 32
#define LPTUNIT(s) ((s)&0x03)
#define LPTFLAGS(s) ((s)&0xfc)
struct lpt_data {
unsigned short lpt_unit;
struct ppb_device lpt_dev;
short sc_state;
/* default case: negative prime, negative ack, handshake strobe,
prime once */
u_char sc_control;
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;
struct buf *sc_statbuf;
short sc_xfercnt ;
char sc_primed;
char *sc_cp ;
u_short sc_irq ; /* IRQ status of port */
#define LP_HAS_IRQ 0x01 /* we have an irq available */
#define LP_USE_IRQ 0x02 /* we are using our irq */
#define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
#define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */
u_char sc_backoff ; /* time to call lptout() again */
};
static int nlpt = 0;
#define MAXLPT 8 /* XXX not much better! */
static struct lpt_data *lptdata[MAXLPT];
#define LPT_NAME "lpt" /* our official name */
static timeout_t lptout;
static int lpt_port_test(struct lpt_data *sc, u_char data, u_char mask);
static int lpt_detect(struct lpt_data *sc);
/*
* Make ourselves visible as a ppbus driver
*/
static struct ppb_device *lptprobe(struct ppb_data *ppb);
static int lptattach(struct ppb_device *dev);
static void lptintr(int unit);
static void lpt_intr(int unit); /* without spls */
#ifdef KERNEL
static struct ppb_driver lptdriver = {
lptprobe, lptattach, LPT_NAME
};
DATA_SET(ppbdriver_set, lptdriver);
#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 lptopen;
static d_close_t lptclose;
static d_write_t lptwrite;
static d_read_t lptread;
static d_ioctl_t lptioctl;
#define CDEV_MAJOR 16
static struct cdevsw lpt_cdevsw = {
/* open */ lptopen,
/* close */ lptclose,
/* read */ lptread,
/* write */ lptwrite,
/* ioctl */ lptioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ LPT_NAME,
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
/* bmaj */ -1
};
static int
lpt_request_ppbus(struct lpt_data *sc, int how)
{
int error;
if (sc->sc_state & HAVEBUS)
return (0);
/* 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)
{
ppb_release_bus(&sc->lpt_dev);
sc->sc_state &= ~HAVEBUS;
return (0);
}
/*
* Internal routine to lptprobe to do port tests of one byte value
*/
static int
lpt_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);
lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
return (temp == data);
}
/*
* Probe simplified by replacing multiple loops with a hardcoded
* test pattern - 1999/02/08 des@freebsd.org
*
* 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
lpt_detect(struct lpt_data *sc)
{
static u_char testbyte[18] = {
0x55, /* alternating zeros */
0xaa, /* alternating ones */
0xfe, 0xfd, 0xfb, 0xf7,
0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
0x01, 0x02, 0x04, 0x08,
0x10, 0x20, 0x40, 0x80 /* walking one */
};
int i, error, status;
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;
}
for (i = 0; i < 18 && status; i++)
if (!lpt_port_test(sc, testbyte[i], 0xff)) {
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);
}
/*
* lptprobe()
*/
static struct ppb_device *
lptprobe(struct ppb_data *ppb)
{
struct lpt_data *sc;
static int once;
if (!once++)
cdevsw_add(&lpt_cdevsw);
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 = lptdriver.name;
sc->lpt_dev.ppb = ppb;
sc->lpt_dev.intr = lptintr;
/*
* Now, try to detect the printer.
*/
if (!lpt_detect(sc)) {
free(sc, M_TEMP);
return (0);
}
/* Ok, go to next device on next probe */
nlpt ++;
return (&sc->lpt_dev);
}
static int
lptattach(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 */
lprintf(("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;
lprintf((LPT_NAME "%d: Polled port\n", dev->id_unit));
}
lprintf(("irq %x\n", sc->sc_irq));
lpt_release_ppbus(sc);
make_dev(&lpt_cdevsw, dev->id_unit,
UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", dev->id_unit);
make_dev(&lpt_cdevsw, dev->id_unit | LP_BYPASS,
UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", dev->id_unit);
return (1);
}
static void
lptout(void *arg)
{
struct lpt_data *sc = arg;
int pl;
lprintf(("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(lptout, (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();
lpt_intr(sc->lpt_unit);
splx(pl);
} else {
sc->sc_state &= ~OBUSY;
wakeup((caddr_t)sc);
}
}
/*
* lptopen -- 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
lptopen(dev_t dev, int flags, int fmt, struct proc *p)
{
struct lpt_data *sc;
int s;
int trys, err;
u_int unit = LPTUNIT(minor(dev));
if ((unit >= nlpt))
return (ENXIO);
sc = lptdata[unit];
if (sc->sc_state) {
lprintf((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 ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0)
return (err);
s = spltty();
lprintf((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;
lprintf(("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_statbuf = geteblk(BUFSTATSIZE);
sc->sc_xfercnt = 0;
splx(s);
/* release the ppbus */
lpt_release_ppbus(sc);
/* only use timeout if using interrupt */
lprintf(("irq %x\n", sc->sc_irq));
if (sc->sc_irq & LP_USE_IRQ) {
sc->sc_state |= TOUT;
timeout(lptout, (caddr_t)sc,
(sc->sc_backoff = hz/LPTOUTINITIAL));
}
lprintf(("opened.\n"));
return(0);
}
/*
* lptclose -- close the device, free the local line buffer.
*
* Check for interrupted write call added.
*/
static int
lptclose(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 ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0)
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);
brelse(sc->sc_statbuf);
end_close:
/* release the bus anyway */
lpt_release_ppbus(sc);
sc->sc_state = 0;
sc->sc_xfercnt = 0;
lprintf(("closed.\n"));
return(0);
}
/*
* lpt_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
lpt_pushbytes(struct lpt_data *sc)
{
int spin, err, tic;
char ch;
lprintf(("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);
}
/*
* lptread --retrieve printer status in IEEE1284 NIBBLE mode
*/
static int
lptread(dev_t dev, struct uio *uio, int ioflag)
{
struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))];
int error = 0, len;
if ((error = ppb_1284_negociate(&sc->lpt_dev, PPB_NIBBLE, 0)))
return (error);
/* read data in an other buffer, read/write may be simultaneous */
len = 0;
while (uio->uio_resid) {
if ((error = ppb_1284_read(&sc->lpt_dev, PPB_NIBBLE,
sc->sc_statbuf->b_data, min(BUFSTATSIZE,
uio->uio_resid), &len))) {
goto error;
}
if (!len)
goto error; /* no more data */
if ((error = uiomove(sc->sc_statbuf->b_data, len, uio)))
goto error;
}
error:
ppb_1284_terminate(&sc->lpt_dev);
return (error);
}
/*
* lptwrite --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
lptwrite(dev_t dev, struct uio *uio, int ioflag)
{
register unsigned n;
int pl, err;
u_int unit = LPTUNIT(minor(dev));
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 ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0)
return (err);
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 ;
if (sc->sc_irq & LP_ENABLE_EXT) {
/* try any extended mode */
err = ppb_write(&sc->lpt_dev, sc->sc_cp,
sc->sc_xfercnt, 0);
switch (err) {
case 0:
/* if not all data was sent, we could rely
* on polling for the last bytes */
sc->sc_xfercnt = 0;
break;
case EINTR:
sc->sc_state |= INTERRUPTED;
return(err);
case EINVAL:
/* advanced mode not avail */
log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit);
break;
default:
return(err);
}
} else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
lprintf(("i"));
/* if the printer is ready for a char, */
/* give it one */
if ((sc->sc_state & OBUSY) == 0){
lprintf(("\nC %d. ", sc->sc_xfercnt));
pl = spltty();
lpt_intr(sc->lpt_unit);
(void) splx(pl);
}
lprintf(("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)) {
lprintf(("p"));
err = lpt_pushbytes(sc);
if (err)
return(err);
}
}
/* we have not been interrupted, release the ppbus */
lpt_release_ppbus(sc);
return(0);
}
/*
* lpt_intr -- handle printer interrupts which occur when the printer is
* ready to accept another char.
*
* do checking for interrupted write call.
*/
static void
lpt_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 lptout() 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 */
/*lprintf(("%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);
lprintf(("w "));
return;
} else { /* check for error */
if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
(sc->sc_state & OPEN))
sc->sc_state |= EERROR;
/* lptout() will jump in and try to restart. */
}
lprintf(("sts %x ", sts));
}
static void
lptintr(int unit)
{
/* call the interrupt at required spl level */
int s = spltty();
lpt_intr(unit);
splx(s);
return;
}
static int
lptioctl(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;
switch(*(int*)data) {
case 0:
sc->sc_irq &= (~LP_ENABLE_IRQ);
break;
case 1:
sc->sc_irq &= (~LP_ENABLE_EXT);
sc->sc_irq |= LP_ENABLE_IRQ;
break;
case 2:
/* classic irq based transfer and advanced
* modes are in conflict
*/
sc->sc_irq &= (~LP_ENABLE_IRQ);
sc->sc_irq |= LP_ENABLE_EXT;
break;
case 3:
sc->sc_irq &= (~LP_ENABLE_EXT);
break;
default:
break;
}
if (old_sc_irq != sc->sc_irq )
log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n",
unit,
(sc->sc_irq & LP_ENABLE_IRQ)?
"interrupt-driven":"polled",
(sc->sc_irq & LP_ENABLE_EXT)?
"extended":"standard");
} else /* polled port */
error = EOPNOTSUPP;
break;
default:
error = ENODEV;
}
return(error);
}
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