/*      $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;
}

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