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      1 /*	$NetBSD: tpcalib.c,v 1.13 2019/07/09 12:55:45 ryoon Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1999-2003 TAKEMURA Shin All rights reserved.
      5  * Copyright (c) 1999 PocketBSD Project. All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: tpcalib.c,v 1.13 2019/07/09 12:55:45 ryoon Exp $");
     32 
     33 #ifdef _KERNEL_OPT
     34 #include "opt_tpcalib.h"
     35 #endif
     36 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/device.h>
     40 #include <sys/kernel.h>
     41 #include <dev/wscons/wsconsio.h>
     42 #include <dev/wscons/tpcalibvar.h>
     43 
     44 #ifdef TPCALIBDEBUG
     45 int	tpcalib_debug = 0;
     46 #define	DPRINTF(arg) if (tpcalib_debug) printf arg;
     47 #else
     48 #define	DPRINTF(arg)
     49 #endif
     50 
     51 /* mra is defined in mra.c */
     52 extern int mra_Y_AX1_BX2_C(const int *, int,
     53 			   const int *, int, const int *, int, int, int,
     54 			   int *, int *, int *);
     55 
     56 #define SCALE	(1024)
     57 
     58 int
     59 tpcalib_init(struct tpcalib_softc *sc)
     60 {
     61 	tpcalib_reset(sc);
     62 	return (0);
     63 }
     64 
     65 void
     66 tpcalib_reset(struct tpcalib_softc *sc)
     67 {
     68 	/* This indicate 'raw mode'. No translation will be done. */
     69 	sc->sc_saved.samplelen = WSMOUSE_CALIBCOORDS_RESET;
     70 }
     71 
     72 void
     73 tpcalib_trans(struct tpcalib_softc *sc, int rawx, int rawy, int *x, int *y)
     74 {
     75 	if (sc->sc_saved.samplelen == WSMOUSE_CALIBCOORDS_RESET) {
     76 		/* This indicate 'raw mode'. No translation will be done. */
     77 		*x = rawx;
     78 		*y = rawy;
     79 	} else {
     80 		*x = (sc->sc_ax * rawx + sc->sc_bx * rawy) / SCALE + sc->sc_cx;
     81 		*y = (sc->sc_ay * rawx + sc->sc_by * rawy) / SCALE + sc->sc_cy;
     82 		if (*x < sc->sc_minx) *x = sc->sc_minx;
     83 		if (*y < sc->sc_miny) *y = sc->sc_miny;
     84 		if (sc->sc_maxx < *x)
     85 			*x = sc->sc_maxx;
     86 		if (sc->sc_maxy < *y)
     87 			*y = sc->sc_maxy;
     88 	}
     89 }
     90 
     91 int
     92 tpcalib_ioctl(struct tpcalib_softc *sc, u_long cmd, void *data,
     93     int flag, struct lwp *l)
     94 {
     95 	const struct wsmouse_calibcoords *d;
     96 	int s;
     97 
     98 	switch (cmd) {
     99 	case WSMOUSEIO_SCALIBCOORDS:
    100 		s = sizeof(struct wsmouse_calibcoord);
    101 		d = (const struct wsmouse_calibcoords *)data;
    102 		if (d->samplelen == WSMOUSE_CALIBCOORDS_RESET) {
    103 			tpcalib_reset(sc);
    104 		}
    105 		if (d->samplelen > 0) {
    106 			if (mra_Y_AX1_BX2_C(&d->samples[0].x, s,
    107 				    &d->samples[0].rawx, s,
    108 				    &d->samples[0].rawy, s,
    109 				    d->samplelen, SCALE,
    110 				    &sc->sc_ax, &sc->sc_bx, &sc->sc_cx) ||
    111 			    mra_Y_AX1_BX2_C(&d->samples[0].y, s,
    112 				    &d->samples[0].rawx, s,
    113 				    &d->samples[0].rawy, s,
    114 				    d->samplelen, SCALE,
    115 				    &sc->sc_ay, &sc->sc_by, &sc->sc_cy)) {
    116 				printf("tpcalib: MRA error");
    117 				tpcalib_reset(sc);
    118 
    119 				return (EINVAL);
    120 			}
    121 		}
    122 		sc->sc_minx = d->minx;
    123 		sc->sc_maxx = d->maxx;
    124 		sc->sc_miny = d->miny;
    125 		sc->sc_maxy = d->maxy;
    126 		sc->sc_saved = *d;
    127 		DPRINTF(("tpcalib: x=%d~%d y=%d~%d\n",
    128 		    sc->sc_minx, sc->sc_maxx,
    129 		    sc->sc_miny, sc->sc_maxy));
    130 		DPRINTF(("tpcalib: Ax=%d Bx=%d Cx=%d\n",
    131 		    sc->sc_ax, sc->sc_bx, sc->sc_cx));
    132 		DPRINTF(("tpcalib: Ay=%d By=%d Cy=%d\n",
    133 		    sc->sc_ay, sc->sc_by, sc->sc_cy));
    134 
    135 		break;
    136 
    137 	case WSMOUSEIO_GCALIBCOORDS:
    138 		*(struct wsmouse_calibcoords *)data = sc->sc_saved;
    139 		break;
    140 
    141 	default:
    142 		return (EPASSTHROUGH);
    143 	}
    144 	return (0);
    145 }
    146