/*      $NetBSD: ms_pckbport.c,v 1.9 2012/10/27 17:18:11 chs Exp $ */

/*
* Copyright (c) 2002 Valeriy E. Ushakov
* 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.
* 3. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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: ms_pckbport.c,v 1.9 2012/10/27 17:18:11 chs Exp $");

/*
* Attach PS/2 mouse at pckbport aux port
* and convert PS/2 mouse protocol to Sun firm events.
*/

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/select.h>
#include <sys/proc.h>

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

#include <dev/pckbport/pckbportvar.h>
#include <dev/pckbport/pmsreg.h>

#include <machine/vuid_event.h>
#include <dev/sun/event_var.h>
#include <dev/sun/msvar.h>

/*
* NB: we {re,ab}use ms_softc input translator state and ignore its
* zs-related members.  Not quite clean, but what the heck.
*/
struct ms_pckbport_softc {
       struct ms_softc sc_ms;

       /* pckbport attachment */
       pckbport_tag_t          sc_kbctag;
       pckbport_slot_t         sc_kbcslot;

       int sc_enabled;                 /* input enabled? */
};

static int      ms_pckbport_match(device_t, cfdata_t, void *);
static void     ms_pckbport_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ms_pckbport, sizeof(struct ms_pckbport_softc),
   ms_pckbport_match, ms_pckbport_attach, NULL, NULL);


static int      ms_pckbport_iopen(device_t, int);
static int      ms_pckbport_iclose(device_t, int);
static void     ms_pckbport_input(void *, int);


static int
ms_pckbport_match(device_t parent, cfdata_t cf, void *aux)
{
       struct pckbport_attach_args *pa = aux;

       return (pa->pa_slot == PCKBPORT_AUX_SLOT);
}


static void
ms_pckbport_attach(device_t parent, device_t self, void *aux)
{
       struct ms_pckbport_softc *sc = device_private(self);
       struct ms_softc *ms = &sc->sc_ms;
       struct pckbport_attach_args *pa = aux;

       u_char cmd[1], resp[2];
       int res;

       ms->ms_dev = self;

       /* save our pckbport attachment */
       sc->sc_kbctag = pa->pa_tag;
       sc->sc_kbcslot = pa->pa_slot;

       /* Hooks called by upper layer on device open/close */
       ms->ms_deviopen = ms_pckbport_iopen;
       ms->ms_deviclose = ms_pckbport_iclose;

       aprint_normal("\n");

       /* reset the device */
       cmd[0] = PMS_RESET;
       res = pckbport_poll_cmd(sc->sc_kbctag, sc->sc_kbcslot,
                            cmd, 1, 2, resp, 1);
#ifdef DIAGNOSTIC
       if (res || resp[0] != PMS_RSTDONE || resp[1] != 0) {
               aprint_error("%s: reset error\n", __func__);
               /* return; */
       }
#endif

       pckbport_set_inputhandler(sc->sc_kbctag, sc->sc_kbcslot,
                              ms_pckbport_input, sc, device_xname(self));

       /* no interrupts until device is actually opened */
       cmd[0] = PMS_DEV_DISABLE;
       res = pckbport_poll_cmd(sc->sc_kbctag, sc->sc_kbcslot, cmd,
                            1, 0, 0, 0);
       if (res)
               aprint_error("%s: failed to disable interrupts\n", __func__);
       pckbport_slot_enable(sc->sc_kbctag, sc->sc_kbcslot, 0);
}


static int
ms_pckbport_iopen(device_t self, int flags)
{
       struct ms_pckbport_softc *sc = device_private(self);
       struct ms_softc *ms = &sc->sc_ms;
       u_char cmd[1];
       int res;

       ms->ms_byteno = 0;
       ms->ms_dx = ms->ms_dy = 0;
       ms->ms_ub = ms->ms_mb = 0;

       pckbport_slot_enable(sc->sc_kbctag, sc->sc_kbcslot, 1);

       cmd[0] = PMS_DEV_ENABLE;
       res = pckbport_enqueue_cmd(sc->sc_kbctag, sc->sc_kbcslot,
                               cmd, 1, 0, 1, NULL);
       if (res) {
               printf("%s: command error\n", __func__);
               return (res);
       }

       sc->sc_enabled = 1;
       return (0);
}


static int
ms_pckbport_iclose(device_t self, int flags)
{
       struct ms_pckbport_softc *sc = device_private(self);
       u_char cmd[1];
       int res;

       cmd[0] = PMS_DEV_DISABLE;
       res = pckbport_enqueue_cmd(sc->sc_kbctag, sc->sc_kbcslot,
                               cmd, 1, 0, 1, NULL);
       if (res)
               printf("%s: command error\n", __func__);

       pckbport_slot_enable(sc->sc_kbctag, sc->sc_kbcslot, 0);

       sc->sc_enabled = 0;
       return (0);
}


/* Masks for the first byte of a PS/2 mouse packet */
#define PS2LBUTMASK 0x01
#define PS2RBUTMASK 0x02
#define PS2MBUTMASK 0x04

/*
* Got a receive interrupt - pckbport wants to give us a byte.
*/
static void
ms_pckbport_input(void *vsc, int data)
{
       struct ms_pckbport_softc *sc = vsc;
       struct ms_softc *ms = &sc->sc_ms;
       struct firm_event *fe;
       int mb, ub, d, get, put, any;

       /* map changed buttons mask to the highest bit */
       static const char to_one[] = { 1, 2, 2, 4, 4, 4, 4 };

       /* map bits to mouse buttons */
       static const int to_id[] = { MS_LEFT, MS_MIDDLE, 0, MS_RIGHT };

       if (!sc->sc_enabled) {
               /* Interrupts are not expected.  Discard the byte. */
               return;
       }

       switch (ms->ms_byteno) {

       case 0:
               if ((data & 0xc0) == 0) { /* no ovfl, bit 3 == 1 too? */
                       ms->ms_mb =
                               ((data & PS2LBUTMASK) ? 0x1 : 0) |
                               ((data & PS2MBUTMASK) ? 0x2 : 0) |
                               ((data & PS2RBUTMASK) ? 0x4 : 0) ;
                       ++ms->ms_byteno;
               }
               return;

       case 1:
               ms->ms_dx += (int8_t)data;
               ++ms->ms_byteno;
               return;

       case 2:
               ms->ms_dy += (int8_t)data;
               ms->ms_byteno = 0;
               break;          /* last byte processed, report changes */
       }

       any = 0;
       get = ms->ms_events.ev_get;
       put = ms->ms_events.ev_put;
       fe = &ms->ms_events.ev_q[put];

       /* NEXT prepares to put the next event, backing off if necessary */
#define NEXT    do {                                            \
                       if ((++put) % EV_QSIZE == get) {        \
                               --put;                          \
                               goto out;                       \
                       }                                       \
               } while (0)

       /* ADVANCE completes the `put' of the event */
#define ADVANCE do {                                            \
                       ++fe;                                   \
                       if (put >= EV_QSIZE) {                  \
                               put = 0;                        \
                               fe = &ms->ms_events.ev_q[0];    \
                       }                                       \
                       any = 1;                                \
               } while (0)

       ub = ms->ms_ub;         /* old buttons state */
       mb = ms->ms_mb;         /* new buttons state */
       while ((d = mb ^ ub) != 0) {
               /*
                * Mouse button change.  Convert up to three state changes
                * to the `first' change, and drop it into the event queue.
                */
               NEXT;
               d = to_one[d - 1];              /* from 1..7 to {1,2,4} */
               fe->id = to_id[d - 1];          /* from {1,2,4} to ID */
               fe->value = (mb & d) ? VKEY_DOWN : VKEY_UP;
               firm_gettime(fe);
               ADVANCE;
               ub ^= d;        /* reflect the button state change */
       }

       if (ms->ms_dx != 0) {
               NEXT;
               fe->id = LOC_X_DELTA;
               fe->value = ms->ms_dx;
               firm_gettime(fe);
               ADVANCE;
               ms->ms_dx = 0;
       }

       if (ms->ms_dy != 0) {
               NEXT;
               fe->id = LOC_Y_DELTA;
               fe->value = ms->ms_dy;
               firm_gettime(fe);
               ADVANCE;
               ms->ms_dy = 0;
       }

 out:
       if (any) {
               ms->ms_ub = ub; /* save button state */
               ms->ms_events.ev_put = put;
               EV_WAKEUP(&ms->ms_events);
       }
}

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