FreeBSD-5.3/sys/pc98/pc98/olpt.c
/*
* 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
* $FreeBSD: src/sys/pc98/pc98/olpt.c,v 1.26 2004/06/16 09:47:19 phk Exp $
*/
/*
* Device Driver for AT parallel printer port
* Written by William Jolitz 12/18/90
*/
/*
* Parallel port TCP/IP interfaces added. I looked at the driver from
* MACH but this is a complete rewrite, and btw. incompatible, and it
* should perform better too. I have never run the MACH driver though.
*
* This driver sends two bytes (0x08, 0x00) in front of each packet,
* to allow us to distinguish another format later.
*
* Now added a Linux/Crynwr compatibility mode which is enabled using
* IF_LINK0 - Tim Wilkinson.
*
* TODO:
* Make HDLC/PPP mode, use IF_LLC1 to enable.
*
* Connect the two computers using a Laplink parallel cable to use this
* feature:
*
* +----------------------------------------+
* |A-name A-End B-End Descr. Port/Bit |
* +----------------------------------------+
* |DATA0 2 15 Data 0/0x01 |
* |-ERROR 15 2 1/0x08 |
* +----------------------------------------+
* |DATA1 3 13 Data 0/0x02 |
* |+SLCT 13 3 1/0x10 |
* +----------------------------------------+
* |DATA2 4 12 Data 0/0x04 |
* |+PE 12 4 1/0x20 |
* +----------------------------------------+
* |DATA3 5 10 Strobe 0/0x08 |
* |-ACK 10 5 1/0x40 |
* +----------------------------------------+
* |DATA4 6 11 Data 0/0x10 |
* |BUSY 11 6 1/~0x80 |
* +----------------------------------------+
* |GND 18-25 18-25 GND - |
* +----------------------------------------+
*
* Expect transfer-rates up to 75 kbyte/sec.
*
* If GCC could correctly grok
* register int port asm("edx")
* the code would be cleaner
*
* Poul-Henning Kamp <phk@freebsd.org>
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/uio.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <machine/clock.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <isa/isavar.h>
#include <i386/isa/lptreg.h>
#include <dev/ppbus/lptio.h>
#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
#ifndef PC98
/* BIOS printer list - used by BIOS probe*/
#define BIOS_LPT_PORTS 0x408
#define BIOS_PORTS (short *)(KERNBASE+BIOS_LPT_PORTS)
#define BIOS_MAX_LPT 4
#endif
#ifndef DEBUG
#define lprintf(args)
#else
#define lprintf(args) do { \
if (lptflag) \
printf args; \
} while (0)
static int volatile lptflag = 1;
#endif
#define LPTUNIT(s) ((s)&0x03)
#define LPTFLAGS(s) ((s)&0xfc)
struct lpt_softc {
struct resource *res_port;
struct resource *res_irq;
void *sc_ih;
int sc_port;
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 */
void *sc_inbuf;
short sc_xfercnt ;
char sc_primed;
char *sc_cp ;
u_char 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 */
u_char sc_backoff ; /* time to call lptout() again */
};
/* bits for state */
#define OPEN (1<<0) /* device is open */
#define ASLP (1<<1) /* awaiting draining of printer */
#define ERROR (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 INIT (1<<6) /* waiting to initialize for open */
#define INTERRUPTED (1<<7) /* write call was interrupted */
/* 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 */
#ifdef PC98
#define NOT_READY(x) ((inb(x) & LPS_NBSY) != LPS_NBSY)
#else /* IBM-PC */
#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(x) ((inb(x)^LPS_INVERT)&LPS_MASK)
#endif
#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
#define MAX_SPIN 20 /* Max delay for device ready in usecs */
static timeout_t lptout;
static int lpt_probe(device_t);
static int lpt_attach(device_t);
static void lpt_intr(void *);
static devclass_t olpt_devclass;
static device_method_t olpt_methods[] = {
DEVMETHOD(device_probe, lpt_probe),
DEVMETHOD(device_attach, lpt_attach),
{ 0, 0 }
};
static driver_t olpt_driver = {
"olpt",
olpt_methods,
sizeof (struct lpt_softc),
};
DRIVER_MODULE(olpt, isa, olpt_driver, olpt_devclass, 0, 0);
static d_open_t lptopen;
static d_close_t lptclose;
static d_write_t lptwrite;
static d_ioctl_t lptioctl;
static struct cdevsw lpt_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = lptopen,
.d_close = lptclose,
.d_write = lptwrite,
.d_ioctl = lptioctl,
.d_name = "lpt",
};
static bus_addr_t lpt_iat[] = {0, 2, 4, 6};
#ifndef PC98
/*
* Internal routine to lptprobe to do port tests of one byte value
*/
static int
lpt_port_test (int port, u_char data, u_char mask)
{
int temp, timeout;
data = data & mask;
outb(port, data);
timeout = 10000;
do {
DELAY(10);
temp = inb(port) & mask;
}
while (temp != data && --timeout);
lprintf(("Port 0x%x\tout=%x\tin=%x\ttout=%d\n",
port, data, temp, timeout));
return (temp == data);
}
#endif /* PC98 */
/*
* 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.
*/
int
lpt_probe(device_t dev)
{
#ifdef PC98
#define PC98_OLD_LPT 0x40
#define PC98_IEEE_1284_FUNCTION 0x149
int rid;
struct resource *res;
/* Check isapnp ids */
if (isa_get_vendorid(dev))
return ENXIO;
rid = 0;
res = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid, lpt_iat, 4,
RF_ACTIVE);
if (res == NULL)
return ENXIO;
isa_load_resourcev(res, lpt_iat, 4);
if (isa_get_port(dev) == PC98_OLD_LPT) {
unsigned int pc98_ieee_mode, tmp;
tmp = inb(PC98_IEEE_1284_FUNCTION);
pc98_ieee_mode = tmp;
if ((tmp & 0x10) == 0x10) {
outb(PC98_IEEE_1284_FUNCTION, tmp & ~0x10);
tmp = inb(PC98_IEEE_1284_FUNCTION);
if ((tmp & 0x10) != 0x10) {
outb(PC98_IEEE_1284_FUNCTION, pc98_ieee_mode);
bus_release_resource(dev, SYS_RES_IOPORT, rid,
res);
return ENXIO;
}
}
}
bus_release_resource(dev, SYS_RES_IOPORT, rid, res);
return 0;
#else
int port;
static short next_bios_lpt = 0;
int status;
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;
/*
* Make sure there is some way for lptopen to see that
* the port is not configured
* This 0 will remain if the port isn't attached
*/
(lpt_sc + dvp->id_unit)->sc_port = 0;
status = IO_LPTSIZE;
/* If port not specified, use bios list */
if(dvp->id_iobase < 0) { /* port? */
if((next_bios_lpt < BIOS_MAX_LPT) &&
(*(BIOS_PORTS+next_bios_lpt) != 0) ) {
dvp->id_iobase = *(BIOS_PORTS+next_bios_lpt++);
goto end_probe;
} else
return (0);
}
/* Port was explicitly specified */
/* This allows probing of ports unknown to the BIOS */
port = dvp->id_iobase + lpt_data;
for (i = 0; i < 18; i++) {
if (!lpt_port_test(port, testbyte[i], 0xff)) {
status = 0;
goto end_probe;
}
}
end_probe:
/* write 0's to control and data ports */
outb(dvp->id_iobase+lpt_data, 0);
outb(dvp->id_iobase+lpt_control, 0);
return (status);
#endif
}
/* XXX Todo - try and detect if interrupt is working */
int
lpt_attach(device_t dev)
{
int rid, unit;
struct lpt_softc *sc;
unit = device_get_unit(dev);
sc = device_get_softc(dev);
rid = 0;
sc->res_port = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid,
lpt_iat, 4, RF_ACTIVE);
if (sc->res_port == NULL)
return ENXIO;
isa_load_resourcev(sc->res_port, lpt_iat, 4);
sc->sc_port = rman_get_start(sc->res_port);
sc->sc_primed = 0; /* not primed yet */
#ifdef PC98
outb(sc->sc_port+lpt_pstb_ctrl, LPC_DIS_PSTB); /* PSTB disable */
outb(sc->sc_port+lpt_control, LPC_MODE8255); /* 8255 mode set */
outb(sc->sc_port+lpt_control, LPC_NIRQ8); /* IRQ8 inactive */
outb(sc->sc_port+lpt_control, LPC_NPSTB); /* PSTB inactive */
outb(sc->sc_port+lpt_pstb_ctrl, LPC_EN_PSTB); /* PSTB enable */
#else
outb(sc->sc_port+lpt_control, LPC_NINIT);
#endif
sc->sc_irq = 0;
if (isa_get_irq(dev) != -1) {
rid = 0;
sc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (sc->res_irq == NULL) {
bus_release_resource(dev, SYS_RES_IOPORT, 0,
sc->res_port);
return ENXIO;
}
if (bus_setup_intr(dev, sc->res_irq, INTR_TYPE_TTY, lpt_intr,
sc, &sc->sc_ih)) {
bus_release_resource(dev, SYS_RES_IOPORT, 0,
sc->res_port);
bus_release_resource(dev, SYS_RES_IRQ, 0,
sc->res_irq);
return ENXIO;
}
sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
device_printf(dev, "Interrupt-driven port");
}
/* XXX what to do about the flags in the minor number? */
make_dev(&lpt_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600, "lpt%d", unit);
make_dev(&lpt_cdevsw, unit | LP_BYPASS,
UID_ROOT, GID_WHEEL, 0600, "lpctl%d", unit);
return 0;
}
/*
* 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 (struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct lpt_softc *sc;
int s;
#ifdef PC98
int port;
#else
int trys, port;
#endif
sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev)));
if (sc->sc_port == 0)
return (ENXIO);
if (sc->sc_state) {
lprintf(("lp: still open %x\n", sc->sc_state));
return(EBUSY);
} else
sc->sc_state |= INIT;
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);
}
s = spltty();
lprintf(("lp flags 0x%x\n", sc->sc_flags));
port = sc->sc_port;
/* 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 */
#ifndef PC98
if ((sc->sc_flags & LP_NO_PRIME) == 0) {
if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
outb(port+lpt_control, 0);
sc->sc_primed++;
DELAY(500);
}
}
outb (port+lpt_control, 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", inb(port+lpt_status)));
return (EBUSY);
}
/* wait 1/4 second, give up if we get a signal */
if (tsleep (sc, LPPRI|PCATCH, "lptinit", hz/4) !=
EWOULDBLOCK) {
sc->sc_state = 0;
splx(s);
return (EBUSY);
}
/* is printer online and ready for output */
} while ((inb(port+lpt_status) & (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;
outb(port+lpt_control, sc->sc_control);
#endif
sc->sc_state = OPEN;
sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK);
sc->sc_xfercnt = 0;
splx(s);
/* 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);
}
static void
lptout (void *arg)
{
struct lpt_softc *sc = arg;
int pl;
lprintf(("T %x ", inb(sc->sc_port+lpt_status)));
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 & ERROR)
sc->sc_state &= ~ERROR;
/*
* Avoid possible hangs do to missed interrupts
*/
if (sc->sc_xfercnt) {
pl = spltty();
lpt_intr(sc);
splx(pl);
} else {
sc->sc_state &= ~OBUSY;
wakeup(sc);
}
}
/*
* lptclose -- close the device, free the local line buffer.
*
* Check for interrupted write call added.
*/
static int
lptclose(struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct lpt_softc *sc;
#ifndef PC98
int port;
#endif
sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev)));
if(sc->sc_flags & LP_BYPASS)
goto end_close;
#ifndef PC98
port = sc->sc_port;
#endif
sc->sc_state &= ~OPEN;
#ifndef PC98
/* if the last write was interrupted, don't complete it */
if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
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 (sc, LPPRI|PCATCH,
"lpclose", hz) != EWOULDBLOCK)
break;
outb(sc->sc_port+lpt_control, LPC_NINIT);
#endif
free(sc->sc_inbuf, M_DEVBUF);
end_close:
sc->sc_state = 0;
sc->sc_xfercnt = 0;
lprintf(("closed.\n"));
return(0);
}
/*
* 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
pushbytes(struct lpt_softc * sc)
{
int spin, err, tic;
char ch;
int port = sc->sc_port;
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(port+lpt_status) && spin<MAX_SPIN; ++spin)
DELAY(1); /* XXX delay is NOT this accurate! */
if (spin >= MAX_SPIN) {
tic = 0;
while (NOT_READY(port+lpt_status)) {
/*
* 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(sc, LPPRI,
"lptpoll", tic);
if (err != EWOULDBLOCK) {
return (err);
}
}
}
/* output data */
outb(port+lpt_data, ch);
#ifdef PC98
DELAY(1);
outb(port+lpt_control, LPC_PSTB);
DELAY(1);
outb(port+lpt_control, LPC_NPSTB);
#else
/* strobe */
outb(port+lpt_control, sc->sc_control|LPC_STB);
outb(port+lpt_control, sc->sc_control);
#endif
}
return(0);
}
/*
* 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(struct cdev *dev, struct uio * uio, int ioflag)
{
register unsigned n;
int pl, err;
struct lpt_softc *sc;
sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev)));
if(sc->sc_flags & LP_BYPASS) {
/* we can't do writes in bypass mode */
return(EPERM);
}
sc->sc_state &= ~INTERRUPTED;
while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
sc->sc_cp = sc->sc_inbuf;
uiomove(sc->sc_cp, n, uio);
sc->sc_xfercnt = n ;
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);
(void) splx(pl);
}
lprintf(("W "));
if (sc->sc_state & OBUSY)
if ((err = tsleep (sc,
LPPRI|PCATCH, "lpwrite", 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"));
if((err = pushbytes(sc)))
return(err);
}
}
return(0);
}
/*
* lptintr -- handle printer interrupts which occur when the printer is
* ready to accept another char.
*
* do checking for interrupted write call.
*/
static void
lpt_intr(void *arg)
{
}
static int
lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
{
int error = 0;
struct lpt_softc *sc;
u_int unit = LPTUNIT(minor(dev));
u_char old_sc_irq; /* old printer IRQ status */
sc = devclass_get_softc(olpt_devclass, 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%c switched to %s mode\n",
(char)unit+'0',
(sc->sc_irq & LP_ENABLE_IRQ)?
"interrupt-driven":"polled");
} else /* polled port */
error = EOPNOTSUPP;
break;
default:
error = ENODEV;
}
return(error);
}