/*      $NetBSD: mms.c,v 1.55 2021/08/07 16:18:55 thorpej Exp $ */

/*-
 * Copyright (c) 1993, 1994 Charles M. Hannum.
 * Copyright (c) 1992, 1993 Erik Forsberg.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY ``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 I 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: mms.c,v 1.55 2021/08/07 16:18:55 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/device.h>

#include <machine/intr.h>
#include <sys/bus.h>

#include <dev/isa/isavar.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsmousevar.h>

#define MMS_ADDR        0       /* offset for register select */
#define MMS_DATA        1       /* offset for InPort data */
#define MMS_IDENT       2       /* offset for identification register */
#define MMS_NPORTS      4

struct mms_softc {              /* driver status information */
        void *sc_ih;

        bus_space_tag_t sc_iot;
        bus_space_handle_t sc_ioh;

        int sc_enabled; /* device is open */

        device_t sc_wsmousedev;
};

static int mmsprobe(device_t, cfdata_t, void *);
static void mmsattach(device_t, device_t, void *);
static int mmsintr(void *);

CFATTACH_DECL_NEW(mms, sizeof(struct mms_softc),
    mmsprobe, mmsattach, NULL, NULL);

static int      mms_enable(void *);
static int      mms_ioctl(void *, u_long, void *, int, struct lwp *);
static void     mms_disable(void *);

static const struct wsmouse_accessops mms_accessops = {
        mms_enable,
        mms_ioctl,
        mms_disable,
};

static int
mmsprobe(device_t parent, cfdata_t match, void *aux)
{
        struct isa_attach_args *ia = aux;
        bus_space_tag_t iot = ia->ia_iot;
        bus_space_handle_t ioh;
        int rv;

        if (ia->ia_nio < 1)
                return (0);
        if (ia->ia_nirq < 1)
                return (0);

        if (ISA_DIRECT_CONFIG(ia))
                return (0);

        /* Disallow wildcarded i/o address. */
        if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
                return 0;

        if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ)
                return 0;

        /* Map the i/o space. */
        if (bus_space_map(iot, ia->ia_io[0].ir_addr, MMS_NPORTS, 0, &ioh))
                return 0;

        rv = 0;

        /* Read identification register to see if present */
        if (bus_space_read_1(iot, ioh, MMS_IDENT) != 0xde)
                goto out;

        /* Seems it was there; reset. */
        bus_space_write_1(iot, ioh, MMS_ADDR, 0x87);

        rv = 1;

        ia->ia_nio = 1;
        ia->ia_io[0].ir_size = MMS_NPORTS;

        ia->ia_nirq = 1;

        ia->ia_niomem = 0;
        ia->ia_ndrq = 0;

out:
        bus_space_unmap(iot, ioh, MMS_NPORTS);
        return rv;
}

static void
mmsattach(device_t parent, device_t self, void *aux)
{
        struct mms_softc *sc = device_private(self);
        struct isa_attach_args *ia = aux;
        bus_space_tag_t iot = ia->ia_iot;
        bus_space_handle_t ioh;
        struct wsmousedev_attach_args a;

        aprint_naive(": Mouse\n");
        aprint_normal(": Microsoft Mouse\n");

        if (bus_space_map(iot, ia->ia_io[0].ir_addr, MMS_NPORTS, 0, &ioh)) {
                aprint_error_dev(self, "can't map i/o space\n");
                return;
        }

        /* Other initialization was done by mmsprobe. */
        sc->sc_iot = iot;
        sc->sc_ioh = ioh;
        sc->sc_enabled = 0;

        sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq,
            IST_PULSE, IPL_TTY, mmsintr, sc);

        a.accessops = &mms_accessops;
        a.accesscookie = sc;

        /*
         * Attach the wsmouse, saving a handle to it.
         * Note that we don't need to check this pointer against NULL
         * here or in psmintr, because if this fails lms_enable() will
         * never be called, so lmsintr() will never be called.
         */
        sc->sc_wsmousedev = config_found(self, &a, wsmousedevprint, CFARGS_NONE);
}

static int
mms_enable(void *v)
{
        struct mms_softc *sc = v;

        if (sc->sc_enabled)
                return EBUSY;

        sc->sc_enabled = 1;

        /* Enable interrupts. */
        bus_space_write_1(sc->sc_iot, sc->sc_ioh, MMS_ADDR, 0x07);
        bus_space_write_1(sc->sc_iot, sc->sc_ioh, MMS_DATA, 0x09);

        return 0;
}

static void
mms_disable(void *v)
{
        struct mms_softc *sc = v;

        /* Disable interrupts. */
        bus_space_write_1(sc->sc_iot, sc->sc_ioh, MMS_ADDR, 0x87);

        sc->sc_enabled = 0;
}

static int
mms_ioctl(void *v, u_long cmd, void *data, int flag, struct lwp *l)
{
#if 0
        struct mms_softc *sc = v;
#endif

        switch (cmd) {
        case WSMOUSEIO_GTYPE:
                *(u_int *)data = WSMOUSE_TYPE_MMS;
                return (0);
        }
        return (EPASSTHROUGH);
}

static int
mmsintr(void *arg)
{
        struct mms_softc *sc = arg;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh = sc->sc_ioh;
        u_char status;
        signed char dx, dy;
        u_int buttons;
        int changed;

        if (!sc->sc_enabled)
                /* Interrupts are not expected. */
                return 0;

        /* Freeze InPort registers (disabling interrupts). */
        bus_space_write_1(iot, ioh, MMS_ADDR, 0x07);
        bus_space_write_1(iot, ioh, MMS_DATA, 0x29);

        bus_space_write_1(iot, ioh, MMS_ADDR, 0x00);
        status = bus_space_read_1(iot, ioh, MMS_DATA);

        if (status & 0x40) {
                bus_space_write_1(iot, ioh, MMS_ADDR, 1);
                dx = bus_space_read_1(iot, ioh, MMS_DATA);
                /* Bounding at -127 avoids a bug in XFree86. */
                dx = (dx == -128) ? -127 : dx;

                bus_space_write_1(iot, ioh, MMS_ADDR, 2);
                dy = bus_space_read_1(iot, ioh, MMS_DATA);
                dy = (dy == -128) ? 127 : -dy;
        } else
                dx = dy = 0;

        /* Unfreeze InPort registers (reenabling interrupts). */
        bus_space_write_1(iot, ioh, MMS_ADDR, 0x07);
        bus_space_write_1(iot, ioh, MMS_DATA, 0x09);

        buttons = ((status & 0x04) ? 0x1 : 0) |
                ((status & 0x02) ? 0x2 : 0) |
                ((status & 0x01) ? 0x4 : 0);
        changed = status & 0x38;

        if (dx || dy || changed)
                wsmouse_input(sc->sc_wsmousedev,
                                buttons,
                                dx, dy, 0, 0,
                                WSMOUSE_INPUT_DELTA);

        return -1;
}