/* $NetBSD: lpt.c,v 1.32 2019/12/27 09:28:41 msaitoh Exp $ */

/*
 * 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: src/sys/dev/ppbus/lpt.c,v 1.15.2.3 2000/07/07 00:30:40 obrien 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]
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.32 2019/12/27 09:28:41 msaitoh Exp $");

#include "opt_ppbus_lpt.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/syslog.h>

#include <sys/bus.h>

#include <dev/ppbus/ppbus_1284.h>
#include <dev/ppbus/ppbus_base.h>
#include <dev/ppbus/ppbus_io.h>
#include <dev/ppbus/ppbus_msq.h>
#include <dev/ppbus/ppbus_var.h>

#include <dev/ppbus/lptvar.h>
#include <dev/ppbus/lptreg.h>
#include <dev/ppbus/lptio.h>

/* Autoconf functions */
static int lpt_probe(device_t, cfdata_t, void *);
static void lpt_attach(device_t, device_t, void *);
static int lpt_detach(device_t, int);

/* Autoconf structure */
CFATTACH_DECL_NEW(lpt_ppbus, sizeof(struct lpt_softc), lpt_probe, lpt_attach,
        lpt_detach, NULL);

extern struct cfdriver lpt_cd;

dev_type_open(lptopen);
dev_type_close(lptclose);
dev_type_read(lptread);
dev_type_write(lptwrite);
dev_type_ioctl(lptioctl);

const struct cdevsw lpt_cdevsw = {
        .d_open = lptopen,
        .d_close = lptclose,
        .d_read = lptread,
        .d_write = lptwrite,
        .d_ioctl = lptioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = nopoll,
        .d_mmap = nommap,
        .d_kqfilter = nokqfilter,
        .d_discard = nodiscard,
        .d_flag = D_OTHER
};


/* Function prototypes */
static int lpt_detect(device_t);
static int lpt_request_ppbus(struct lpt_softc *, int);
static int lpt_release_ppbus(struct lpt_softc *, int);
static int lpt_logstatus(const device_t, const unsigned char);

/*
 * lpt_probe()
 */
static int
lpt_probe(device_t parent, cfdata_t match, void *aux)
{
        /* Test ppbus's capability */
        return lpt_detect(parent);
}

static void
lpt_attach(device_t parent, device_t self, void *aux)
{
        struct lpt_softc * sc = device_private(self);
        struct ppbus_device_softc * ppbdev = &(sc->ppbus_dev);
        struct ppbus_attach_args * args = aux;
        char buf[64];
        int error;

        ppbdev->sc_dev = self;

        error = lpt_request_ppbus(sc, 0);
        if(error) {
                printf("%s(%s): error (%d) requesting bus(%s). Device not "
                        "properly attached.\n", __func__, device_xname(self),
                        error, device_xname(parent));
                return;
        }

        /* Record capabilities */
        ppbdev->capabilities = args->capabilities;

        /* Allocate memory buffers */
        if(ppbdev->capabilities & PPBUS_HAS_DMA) {
                if(ppbus_dma_malloc(parent, &(sc->sc_inbuf),
                        &(sc->sc_in_baddr), BUFSIZE)) {

                        printf(" : cannot allocate input DMA buffer. Device "
                                "not properly attached!\n");
                        return;
                }
                if(ppbus_dma_malloc(parent, &(sc->sc_outbuf),
                        &(sc->sc_out_baddr), BUFSIZE)) {

                        ppbus_dma_free(parent, &(sc->sc_inbuf),
                                &(sc->sc_in_baddr), BUFSIZE);
                        printf(" : cannot allocate output DMA buffer. Device "
                                "not properly attached!\n");
                        return;
                }
        } else {
                sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK);
                sc->sc_outbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK);
        }

        /* Print out mode */
        ppbdev->ctx.mode = ppbus_get_mode(parent);
        snprintb(buf, sizeof(buf),
            "\20\1COMPATIBLE\2NIBBLE\3PS2\4EPP\5ECP\6FAST_CENTR",
            ppbdev->ctx.mode);
        printf(": port mode = %s\n", buf);

        /* Initialize the device on open by default */
        sc->sc_flags = LPT_PRIME;

        lpt_release_ppbus(sc, 0);
}

static int
lpt_detach(device_t self, int flags)
{
        struct lpt_softc * lpt = device_private(self);
        struct ppbus_device_softc * ppbdev = (struct ppbus_device_softc *) lpt;
        int err;

        if(lpt->sc_state & HAVEBUS) {
                err = lpt_release_ppbus(lpt, 0);
                if(err) {
                        printf("%s error (%d) while releasing bus",
                                device_xname(self), err);
                        if(flags & DETACH_FORCE) {
                                printf(", continuing (DETACH_FORCE)!\n");
                        }
                        else {
                                printf(", terminating!\n");
                                return 0;
                        }
                }
                lpt->sc_state &= ~HAVEBUS;
        }

        ppbdev->ctx.valid = 0;

        /* Free memory buffers */
        if(ppbdev->capabilities & PPBUS_HAS_DMA) {
                ppbus_dma_free(device_parent(self), &(lpt->sc_inbuf),
                        &(lpt->sc_in_baddr), BUFSIZE);
                ppbus_dma_free(device_parent(self), &(lpt->sc_outbuf),
                        &(lpt->sc_out_baddr), BUFSIZE);
        } else {
                free(lpt->sc_inbuf, M_DEVBUF);
                free(lpt->sc_outbuf, M_DEVBUF);
        }

        return 1;
}

/* Grab bus for lpt device */
static int
lpt_request_ppbus(struct lpt_softc * lpt, int how)
{
        device_t dev = lpt->ppbus_dev.sc_dev;
        int error;

        error = ppbus_request_bus(device_parent(dev), dev, how, (hz));
        if (!(error)) {
                lpt->sc_state |= HAVEBUS;
        }
        else {
                LPT_DPRINTF(("%s(%s): error %d requesting bus.\n", __func__,
                        device_xname(dev), error));
        }

        return error;
}

/* Release ppbus to enable other devices to use it. */
static int
lpt_release_ppbus(struct lpt_softc * lpt, int how)
{
        device_t dev = lpt->ppbus_dev.sc_dev;
        int error;

        if(lpt->sc_state & HAVEBUS) {
                error = ppbus_release_bus(device_parent(dev), dev, how, (hz));
                if(!(error))
                        lpt->sc_state &= ~HAVEBUS;
                else {
                        LPT_DPRINTF(("%s(%s): error releasing bus.\n", __func__,
                                device_xname(dev)));
                }
        }
        else {
                error = EINVAL;
                LPT_DPRINTF(("%s(%s): device does not own bus.\n", __func__,
                        device_xname(dev)));
        }

        return error;
}


/*
 * 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 manuals 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(device_t dev)
{
        static const 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, status;
        u_char dtr, ctr, str, var;

        /* Save register contents */
        dtr = ppbus_rdtr(dev);
        ctr = ppbus_rctr(dev);
        str = ppbus_rstr(dev);

        status = 1;                             /* assume success */

        /* Test data port */
        for(i = 0; i < 18; i++) {
                ppbus_wdtr(dev, testbyte[i]);
                if((var = ppbus_rdtr(dev)) != testbyte[i]) {
                        status = 0;
                        LPT_DPRINTF(("%s(%s): byte value %x cannot be written "
                                "and read from data port (got %x instead).\n",
                                __func__, device_xname(dev), testbyte[i], var));
                        goto end;
                }
        }

        /* Test control port */
        ppbus_wdtr(dev, 0);
        for(i = 0; i < 18; i++) {
                ppbus_wctr(dev, (testbyte[i] & 0x14));
                if(((var = ppbus_rctr(dev)) & 0x14) != (testbyte[i] & 0x14)) {
                        status = 0;
                        LPT_DPRINTF(("%s(%s): byte value %x (unmasked value "
                                "%x) cannot be written and read from control "
                                "port (got %x instead).\n", __func__,
                                device_xname(dev), (testbyte[i] & 0x14),
                                testbyte[i], (var & 0x14)));
                        break;
                }
        }

end:
        /* Restore contents of registers */
        ppbus_wdtr(dev, dtr);
        ppbus_wctr(dev, ctr);
        ppbus_wstr(dev, str);

        return status;
}

/* Log status of status register for printer port */
static int
lpt_logstatus(const device_t dev, const unsigned char status)
{
        int err;

        err = EIO;
        if(!(status & LPS_SEL)) {
                log(LOG_ERR, "%s: offline.", device_xname(dev));
        }
        else if(!(status & LPS_NBSY)) {
                log(LOG_ERR, "%s: busy.", device_xname(dev));
        }
        else if(status & LPS_OUT) {
                log(LOG_ERR, "%s: out of paper.", device_xname(dev));
                err = EAGAIN;
        }
        else if(!(status & LPS_NERR)) {
                log(LOG_ERR, "%s: output error.", device_xname(dev));
        }
        else {
                log(LOG_ERR, "%s: no error indication.", device_xname(dev));
                err = 0;
        }

        return err;
}

/*
 * lptopen -- reset the printer, then wait until it's selected and not busy.
 */
int
lptopen(dev_t dev_id, int flags, int fmt, struct lwp *l)
{
        int trys, err;
        u_int8_t status;
        device_t dev;
        struct lpt_softc * lpt;
        struct ppbus_device_softc * ppbus_dev;
        device_t ppbus;

        dev = device_lookup(&lpt_cd, LPTUNIT(dev_id));
        if(!dev) {
                LPT_DPRINTF(("%s(): device not configured.\n", __func__));
                return ENXIO;
        }

        lpt = device_private(dev);

        ppbus = device_parent(dev);
        ppbus_dev = &(lpt->ppbus_dev);

        /* Request the ppbus */
        err = lpt_request_ppbus(lpt, PPBUS_WAIT|PPBUS_INTR);
        if(err) {
                LPT_DPRINTF(("%s(%s): error (%d) while requesting bus.\n",
                        __func__, device_xname(dev), err));
                return (err);
        }

        /* Update bus mode */
        ppbus_dev->ctx.mode = ppbus_get_mode(ppbus);

        /* init printer */
        if ((lpt->sc_flags & LPT_PRIME) && !LPTCTL(dev_id)) {
                LPT_VPRINTF(("%s(%s): initializing printer.\n", __func__,
                        device_xname(dev)));
                lpt->sc_state |= LPTINIT;
                ppbus_wctr(ppbus, LPC_SEL | LPC_NINIT);

                /* wait till ready (printer running diagnostics) */
                for(trys = 0, status = ppbus_rstr(ppbus); (status & RDY_MASK)
                        != LP_READY; trys += LPT_STEP, status =
                        ppbus_rstr(ppbus)) {

                        /* Time up waiting for the printer */
                        if(trys >= LPT_TIMEOUT)
                                break;
                        /* wait LPT_STEP ticks, give up if we get a signal */
                        else {
                                err = tsleep((void *)lpt, LPPRI|PCATCH,
                                        "lptinit", LPT_STEP);
                                if((err) && (err != EWOULDBLOCK)) {
                                        lpt->sc_state &= ~LPTINIT;
                                        LPT_DPRINTF(("%s(%s): interrupted "
                                        "during initialization.\n", __func__,
                                        device_xname(dev)));
                                        lpt_release_ppbus(lpt, PPBUS_WAIT);
                                        return (err);
                                }
                        }
                }

                lpt->sc_state &= ~LPTINIT;
                if(trys >= LPT_TIMEOUT) {
                        LPT_DPRINTF(("%s(%s): timed out while initializing "
                                "printer. [status %x]\n", __func__,
                                device_xname(dev), status));
                        err = lpt_logstatus(dev, status);
                        lpt_release_ppbus(lpt, PPBUS_WAIT);
                        return (err);
                }
                else {
                        LPT_VPRINTF(("%s(%s): printer ready.\n", __func__,
                                device_xname(dev)));
                }
        }

        /* Set autolinefeed if requested */
        if (lpt->sc_flags & LPT_AUTOLF)
                ppbus_wctr(ppbus, LPC_AUTOL);
        else
                ppbus_wctr(ppbus, 0);

        /* ready now */
        lpt->sc_state |= OPEN;

        return 0;
}

/*
 * lptclose -- close the device, free the local line buffer.
 *
 * Check for interrupted write call added.
 */
int
lptclose(dev_t dev_id, int flags, int fmt, struct lwp *l)
{
        device_t dev = device_lookup(&lpt_cd, LPTUNIT(dev_id));
        struct lpt_softc *sc = device_private(dev);
        int err;

        err = lpt_release_ppbus(sc, PPBUS_WAIT|PPBUS_INTR);
        if(err) {
                LPT_DPRINTF(("%s(%s): error (%d) while releasing ppbus.\n",
                        __func__, device_xname(dev), err));
        }

        sc->sc_state = 0;

        return err;
}

/*
 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
 */
int
lptread(dev_t dev_id, struct uio *uio, int ioflag)
{
        size_t len = 0;
        int error = 0;
        device_t dev = device_lookup(&lpt_cd, LPTUNIT(dev_id));
        struct lpt_softc *sc = device_private(dev);

        if(!(sc->sc_state & HAVEBUS)) {
                LPT_DPRINTF(("%s(%s): attempt to read using device which does "
                        "not own the bus(%s).\n", __func__, device_xname(dev),
                        device_xname(device_parent(dev))));
                return (ENODEV);
        }

        sc->sc_state &= ~INTERRUPTED;
        while (uio->uio_resid) {
                error = ppbus_read(device_parent(dev), sc->sc_outbuf,
                        uimin(BUFSIZE, uio->uio_resid), 0, &len);

                /* If error or no more data, stop */
                if (error) {
                        if (error != EWOULDBLOCK)
                                sc->sc_state |= INTERRUPTED;
                        break;
                }
                if (len == 0)
                        break;

                if ((error = uiomove(sc->sc_outbuf, len, uio)))
                        break;
        }

        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.
 */
int
lptwrite(dev_t dev_id, struct uio * uio, int ioflag)
{
        int error=0;
        size_t n, cnt;
        device_t dev = device_lookup(&lpt_cd, LPTUNIT(dev_id));
        struct lpt_softc * sc = device_private(dev);

        /* Check state and flags */
        if(!(sc->sc_state & HAVEBUS)) {
                LPT_DPRINTF(("%s(%s): attempt to write using device which does "
                        "not own the bus(%s).\n", __func__, device_xname(dev),
                        device_xname(device_parent(dev))));
                return EINVAL;
        }

        LPT_VPRINTF(("%s(%s): writing %zu bytes\n", __func__,
            device_xname(dev), uio->uio_resid));

        /* Write the data */
        sc->sc_state &= ~INTERRUPTED;
        while (uio->uio_resid) {
                n = MIN(BUFSIZE, uio->uio_resid);
                error = uiomove(sc->sc_inbuf, n, uio);
                if (error)
                        break;

                error = ppbus_write(device_parent(dev), sc->sc_inbuf, n, ioflag,
                        &cnt);
                if (error) {
                        if (error != EWOULDBLOCK)
                                sc->sc_state |= INTERRUPTED;
                        break;
                }
        }

        LPT_VPRINTF(("%s(%s): transfer finished, error %d.\n", __func__,
            device_xname(dev), error));

        return error;
}

/* Printer ioctl */
int
lptioctl(dev_t dev_id, u_long cmd, void *data, int flags, struct lwp *l)
{
        device_t dev = device_lookup(&lpt_cd, LPTUNIT(dev_id));
        struct lpt_softc *sc = device_private(dev);
        int val, fl;
        int error=0;

        if(!(sc->sc_state & HAVEBUS)) {
                LPT_DPRINTF(("%s(%s): attempt to perform ioctl on device which "
                        "does not own the bus(%s).\n", __func__, device_xname(dev),
                        device_xname(device_parent(dev))));
                return EBUSY;
        }

        switch (cmd) {
        case LPTGMODE:
                switch (ppbus_get_mode(device_parent(dev))) {
                case PPBUS_COMPATIBLE:
                        val = mode_standard;
                        break;
                case PPBUS_NIBBLE:
                        val = mode_nibble;
                        break;
                case PPBUS_PS2:
                        val = mode_ps2;
                        break;
                case PPBUS_FAST:
                        val = mode_fast;
                        break;
                case PPBUS_EPP:
                        val = mode_epp;
                        break;
                case PPBUS_ECP:
                        val = mode_ecp;
                        break;
                default:
                        error = EINVAL;
                        val = mode_unknown;
                        break;
                }
                *(int *)data = val;
                break;

        case LPTSMODE:
                switch (*(int *)data) {
                case mode_standard:
                        val = PPBUS_COMPATIBLE;
                        break;
                case mode_nibble:
                        val = PPBUS_NIBBLE;
                        break;
                case mode_ps2:
                        val = PPBUS_PS2;
                        break;
                case mode_fast:
                        val = PPBUS_FAST;
                        break;
                case mode_epp:
                        val = PPBUS_EPP;
                        break;
                case mode_ecp:
                        val = PPBUS_ECP;
                        break;
                default:
                        error = EINVAL;
                        val = mode_unknown;
                        break;
                }

                if (!error)
                        error = ppbus_set_mode(device_parent(dev), val, 0);

                break;

        case LPTGFLAGS:
                fl = 0;

                /* DMA */
                error = ppbus_read_ivar(device_parent(dev), PPBUS_IVAR_DMA, &val);
                if (error)
                        break;
                if (val)
                        fl |= LPT_DMA;

                /* IEEE mode negotiation */
                error = ppbus_read_ivar(device_parent(dev), PPBUS_IVAR_IEEE, &val);
                if (error)
                        break;
                if (val)
                        fl |= LPT_IEEE;

                /* interrupts */
                error = ppbus_read_ivar(device_parent(dev), PPBUS_IVAR_INTR, &val);
                if (error)
                        break;
                if (val)
                        fl |= LPT_INTR;

                /* lpt-only flags */
                fl |= sc->sc_flags;

                *(int *)data = fl;
                break;

        case LPTSFLAGS:
                fl = *(int *)data;

                /* DMA */
                val = (fl & LPT_DMA);
                error = ppbus_write_ivar(device_parent(dev), PPBUS_IVAR_DMA, &val);
                if (error)
                        break;

                /* IEEE mode negotiation */
                val = (fl & LPT_IEEE);
                error = ppbus_write_ivar(device_parent(dev), PPBUS_IVAR_IEEE, &val);
                if (error)
                        break;

                /* interrupts */
                val = (fl & LPT_INTR);
                error = ppbus_write_ivar(device_parent(dev), PPBUS_IVAR_INTR, &val);
                if (error)
                        break;

                /* lpt-only flags */
                sc->sc_flags = fl & (LPT_PRIME|LPT_AUTOLF);

                break;

        default:
                error = EINVAL;
                break;
        }

        return error;
}