/*      $NetBSD: tpcalib.c,v 1.13 2019/07/09 12:55:45 ryoon Exp $       */

/*
 * Copyright (c) 1999-2003 TAKEMURA Shin All rights reserved.
 * Copyright (c) 1999 PocketBSD Project. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
 *
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tpcalib.c,v 1.13 2019/07/09 12:55:45 ryoon Exp $");

#ifdef _KERNEL_OPT
#include "opt_tpcalib.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/tpcalibvar.h>

#ifdef TPCALIBDEBUG
int     tpcalib_debug = 0;
#define DPRINTF(arg) if (tpcalib_debug) printf arg;
#else
#define DPRINTF(arg)
#endif

/* mra is defined in mra.c */
extern int mra_Y_AX1_BX2_C(const int *, int,
                           const int *, int, const int *, int, int, int,
                           int *, int *, int *);

#define SCALE   (1024)

int
tpcalib_init(struct tpcalib_softc *sc)
{
        tpcalib_reset(sc);
        return (0);
}

void
tpcalib_reset(struct tpcalib_softc *sc)
{
        /* This indicate 'raw mode'. No translation will be done. */
        sc->sc_saved.samplelen = WSMOUSE_CALIBCOORDS_RESET;
}

void
tpcalib_trans(struct tpcalib_softc *sc, int rawx, int rawy, int *x, int *y)
{
        if (sc->sc_saved.samplelen == WSMOUSE_CALIBCOORDS_RESET) {
                /* This indicate 'raw mode'. No translation will be done. */
                *x = rawx;
                *y = rawy;
        } else {
                *x = (sc->sc_ax * rawx + sc->sc_bx * rawy) / SCALE + sc->sc_cx;
                *y = (sc->sc_ay * rawx + sc->sc_by * rawy) / SCALE + sc->sc_cy;
                if (*x < sc->sc_minx) *x = sc->sc_minx;
                if (*y < sc->sc_miny) *y = sc->sc_miny;
                if (sc->sc_maxx < *x)
                        *x = sc->sc_maxx;
                if (sc->sc_maxy < *y)
                        *y = sc->sc_maxy;
        }
}

int
tpcalib_ioctl(struct tpcalib_softc *sc, u_long cmd, void *data,
    int flag, struct lwp *l)
{
        const struct wsmouse_calibcoords *d;
        int s;

        switch (cmd) {
        case WSMOUSEIO_SCALIBCOORDS:
                s = sizeof(struct wsmouse_calibcoord);
                d = (const struct wsmouse_calibcoords *)data;
                if (d->samplelen == WSMOUSE_CALIBCOORDS_RESET) {
                        tpcalib_reset(sc);
                } 
                if (d->samplelen > 0) {
                        if (mra_Y_AX1_BX2_C(&d->samples[0].x, s,
                                    &d->samples[0].rawx, s,
                                    &d->samples[0].rawy, s,
                                    d->samplelen, SCALE,
                                    &sc->sc_ax, &sc->sc_bx, &sc->sc_cx) ||
                            mra_Y_AX1_BX2_C(&d->samples[0].y, s,
                                    &d->samples[0].rawx, s,
                                    &d->samples[0].rawy, s,
                                    d->samplelen, SCALE,
                                    &sc->sc_ay, &sc->sc_by, &sc->sc_cy)) {
                                printf("tpcalib: MRA error");
                                tpcalib_reset(sc);

                                return (EINVAL);
                        }
                }
                sc->sc_minx = d->minx;
                sc->sc_maxx = d->maxx;
                sc->sc_miny = d->miny;
                sc->sc_maxy = d->maxy;
                sc->sc_saved = *d;
                DPRINTF(("tpcalib: x=%d~%d y=%d~%d\n",
                    sc->sc_minx, sc->sc_maxx,
                    sc->sc_miny, sc->sc_maxy));
                DPRINTF(("tpcalib: Ax=%d Bx=%d Cx=%d\n",
                    sc->sc_ax, sc->sc_bx, sc->sc_cx));
                DPRINTF(("tpcalib: Ay=%d By=%d Cy=%d\n",
                    sc->sc_ay, sc->sc_by, sc->sc_cy));
                
                break;

        case WSMOUSEIO_GCALIBCOORDS:
                *(struct wsmouse_calibcoords *)data = sc->sc_saved;
                break;

        default:
                return (EPASSTHROUGH);
        }
        return (0);
}