diff options
Diffstat (limited to 'sys/dev/ppbus/lpt.c')
| -rw-r--r-- | sys/dev/ppbus/lpt.c | 921 |
1 files changed, 921 insertions, 0 deletions
diff --git a/sys/dev/ppbus/lpt.c b/sys/dev/ppbus/lpt.c new file mode 100644 index 0000000..4fd67b8 --- /dev/null +++ b/sys/dev/ppbus/lpt.c @@ -0,0 +1,921 @@ +/* + * 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 + * $Id$ + */ + +/* + * 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/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) + +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_drvinit(void *unused); + +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 = + { lptopen, lptclose, lptread, lptwrite, /*16*/ + lptioctl, nullstop, nullreset, nodevtotty, /* lpt */ + seltrue, nommap, nostrat, LPT_NAME, NULL, -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; + + 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); + +#ifdef DEVFS + sc->devfs_token = devfs_add_devswf(&lpt_cdevsw, + dev->id_unit, DV_CHR, + UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", dev->id_unit); + sc->devfs_token_ctl = devfs_add_devswf(&lpt_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 +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); +} + +static lpt_devsw_installed = 0; + +static void +lpt_drvinit(void *unused) +{ + dev_t dev; + + if( ! lpt_devsw_installed ) { + dev = makedev(CDEV_MAJOR, 0); + cdevsw_add(&dev,&lpt_cdevsw, NULL); + lpt_devsw_installed = 1; + } +} + +SYSINIT(lptdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,lpt_drvinit,NULL) |
