/*      $NetBSD: lms.c,v 1.58 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: lms.c,v 1.58 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 <sys/bus.h>
#include <machine/intr.h>

#include <dev/isa/isavar.h>

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

#define LMS_DATA        0       /* offset for data port, read-only */
#define LMS_SIGN        1       /* offset for signature port, read-write */
#define LMS_INTR        2       /* offset for interrupt port, read-only */
#define LMS_CNTRL       2       /* offset for control port, write-only */
#define LMS_CONFIG      3       /* for configuration port, read-write */
#define LMS_NPORTS      4

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

        bus_space_tag_t sc_iot;         /* bus i/o space identifier */
        bus_space_handle_t sc_ioh;      /* bus i/o handle */

        int sc_enabled; /* device is open */
        int oldbuttons; /* mouse button status */

        device_t sc_wsmousedev;
};

static int lmsprobe(device_t, cfdata_t, void *);
static void lmsattach(device_t, device_t, void *);
static int lmsintr(void *);

CFATTACH_DECL_NEW(lms, sizeof(struct lms_softc),
    lmsprobe, lmsattach, NULL, NULL);

static int      lms_enable(void *);
static int      lms_ioctl(void *, u_long, void *, int, struct lwp *);
static void     lms_disable(void *);

static const struct wsmouse_accessops lms_accessops = {
        lms_enable,
        lms_ioctl,
        lms_disable,
};

static int
lmsprobe(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 base. */
        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, LMS_NPORTS, 0, &ioh))
                return 0;

        rv = 0;

        /* Configure and check for port present. */
        bus_space_write_1(iot, ioh, LMS_CONFIG, 0x91);
        delay(10);
        bus_space_write_1(iot, ioh, LMS_SIGN, 0x0c);
        delay(10);
        if (bus_space_read_1(iot, ioh, LMS_SIGN) != 0x0c)
                goto out;
        bus_space_write_1(iot, ioh, LMS_SIGN, 0x50);
        delay(10);
        if (bus_space_read_1(iot, ioh, LMS_SIGN) != 0x50)
                goto out;

        /* Disable interrupts. */
        bus_space_write_1(iot, ioh, LMS_CNTRL, 0x10);

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

        ia->ia_nirq = 1;

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

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

static void
lmsattach(device_t parent, device_t self, void *aux)
{
        struct lms_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(": Logitech Mouse\n");

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

        /* Other initialization was done by lmsprobe. */
        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, lmsintr, sc);

        a.accessops = &lms_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
lms_enable(void *v)
{
        struct lms_softc *sc = v;

        if (sc->sc_enabled)
                return EBUSY;

        sc->sc_enabled = 1;
        sc->oldbuttons = 0;

        /* Enable interrupts. */
        bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMS_CNTRL, 0);

        return 0;
}

static void
lms_disable(void *v)
{
        struct lms_softc *sc = v;

        /* Disable interrupts. */
        bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMS_CNTRL, 0x10);

        sc->sc_enabled = 0;
}

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

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

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

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

        bus_space_write_1(iot, ioh, LMS_CNTRL, 0xab);
        hi = bus_space_read_1(iot, ioh, LMS_DATA);
        bus_space_write_1(iot, ioh, LMS_CNTRL, 0x90);
        lo = bus_space_read_1(iot, ioh, LMS_DATA);
        dx = ((hi & 0x0f) << 4) | (lo & 0x0f);
        /* Bounding at -127 avoids a bug in XFree86. */
        dx = (dx == -128) ? -127 : dx;

        bus_space_write_1(iot, ioh, LMS_CNTRL, 0xf0);
        hi = bus_space_read_1(iot, ioh, LMS_DATA);
        bus_space_write_1(iot, ioh, LMS_CNTRL, 0xd0);
        lo = bus_space_read_1(iot, ioh, LMS_DATA);
        dy = ((hi & 0x0f) << 4) | (lo & 0x0f);
        dy = (dy == -128) ? 127 : -dy;

        bus_space_write_1(iot, ioh, LMS_CNTRL, 0);

        buttons = ((hi & 0x80) ? 0 : 0x1) |
                ((hi & 0x40) ? 0 : 0x2) |
                ((hi & 0x20) ? 0 : 0x4);
        changed = (buttons ^ sc->oldbuttons);
        sc->oldbuttons = buttons;

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

        return -1;
}