/*      $NetBSD: opms.c,v 1.26 2021/09/26 16:36:18 thorpej Exp $        */
/*      $OpenBSD: pccons.c,v 1.22 1999/01/30 22:39:37 imp Exp $ */
/*      NetBSD: pms.c,v 1.21 1995/04/18 02:25:18 mycroft Exp    */

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz and Don Ahn.
*
* Copyright (c) 1994 Charles M. Hannum.
* Copyright (c) 1992, 1993 Erik Forsberg.
*
* 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. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
*      @(#)pccons.c    5.11 (Berkeley) 5/21/91
*/

/*-
* Copyright (c) 1993, 1994, 1995 Charles M. Hannum.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz and Don Ahn.
*
* Copyright (c) 1994 Charles M. Hannum.
* Copyright (c) 1992, 1993 Erik Forsberg.
*
* 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. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
*      @(#)pccons.c    5.11 (Berkeley) 5/21/91
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: opms.c,v 1.26 2021/09/26 16:36:18 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/poll.h>
#include <sys/tty.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/conf.h>

#include <sys/bus.h>
#include <machine/kbdreg.h>
#include <machine/mouse.h>

#include <arc/dev/pcconsvar.h>
#include <arc/dev/opmsvar.h>

#include "ioconf.h"

#define PMSUNIT(dev)    (minor(dev))

/* status bits */
#define PMS_OBUF_FULL   0x01
#define PMS_IBUF_FULL   0x02

/* controller commands */
#define PMS_INT_ENABLE  0x47    /* enable controller interrupts */
#define PMS_INT_DISABLE 0x65    /* disable controller interrupts */
#define PMS_AUX_ENABLE  0xa7    /* enable auxiliary port */
#define PMS_AUX_DISABLE 0xa8    /* disable auxiliary port */
#define PMS_MAGIC_1     0xa9    /* XXX */

#define PMS_8042_CMD    0x65

/* mouse commands */
#define PMS_SET_SCALE11 0xe6    /* set scaling 1:1 */
#define PMS_SET_SCALE21 0xe7    /* set scaling 2:1 */
#define PMS_SET_RES     0xe8    /* set resolution */
#define PMS_GET_SCALE   0xe9    /* get scaling factor */
#define PMS_SET_STREAM  0xea    /* set streaming mode */
#define PMS_SET_SAMPLE  0xf3    /* set sampling rate */
#define PMS_DEV_ENABLE  0xf4    /* mouse on */
#define PMS_DEV_DISABLE 0xf5    /* mouse off */
#define PMS_RESET       0xff    /* reset */

#define PMS_CHUNK       128     /* chunk size for read */
#define PMS_BSIZE       1020    /* buffer size */

#define FLUSHQ(q) { if((q)->c_cc) ndflush(q, (q)->c_cc); }

dev_type_open(opmsopen);
dev_type_close(opmsclose);
dev_type_read(opmsread);
dev_type_ioctl(opmsioctl);
dev_type_poll(opmspoll);
dev_type_kqfilter(opmskqfilter);

const struct cdevsw opms_cdevsw = {
       .d_open = opmsopen,
       .d_close = opmsclose,
       .d_read = opmsread,
       .d_write = nowrite,
       .d_ioctl = opmsioctl,
       .d_stop = nostop,
       .d_tty = notty,
       .d_poll = opmspoll,
       .d_mmap = nommap,
       .d_kqfilter = opmskqfilter,
       .d_discard = nodiscard,
       .d_flag = 0
};

static inline void pms_dev_cmd(uint8_t);
static inline void pms_aux_cmd(uint8_t);
static inline void pms_pit_cmd(uint8_t);

static inline void
pms_dev_cmd(uint8_t value)
{

       kbd_flush_input();
       kbd_cmd_write_1(0xd4);
       kbd_flush_input();
       kbd_data_write_1(value);
}

static inline void
pms_aux_cmd(uint8_t value)
{

       kbd_flush_input();
       kbd_cmd_write_1(value);
}

static inline void
pms_pit_cmd(uint8_t value)
{

       kbd_flush_input();
       kbd_cmd_write_1(0x60);
       kbd_flush_input();
       kbd_data_write_1(value);
}

int opms_common_match(bus_space_tag_t kbd_iot, struct pccons_config *config)
{
       uint8_t x;

       kbd_context_init(kbd_iot, config);

       pms_dev_cmd(KBC_RESET);
       pms_aux_cmd(PMS_MAGIC_1);
       delay(10000);
       x = kbd_data_read_1();
       pms_pit_cmd(PMS_INT_DISABLE);
       if (x & 0x04)
               return 0;

       return 1;
}

void
opms_common_attach(struct opms_softc *sc, bus_space_tag_t opms_iot,
   struct pccons_config *config)
{

       kbd_context_init(opms_iot, config);
       selinit(&sc->sc_rsel);

       /* Other initialization was done by opmsprobe. */
       sc->sc_state = 0;
}

int
opmsopen(dev_t dev, int flag, int mode, struct lwp *l)
{
       struct opms_softc *sc;

       sc = device_lookup_private(&opms_cd, PMSUNIT(dev));
       if (!sc)
               return ENXIO;

       if (sc->sc_state & PMS_OPEN)
               return EBUSY;

       if (clalloc(&sc->sc_q, PMS_BSIZE, 0) == -1)
               return ENOMEM;

       sc->sc_state |= PMS_OPEN;
       sc->sc_status = 0;
       sc->sc_x = sc->sc_y = 0;

       /* Enable interrupts. */
       pms_dev_cmd(PMS_DEV_ENABLE);
       pms_aux_cmd(PMS_AUX_ENABLE);
       pms_dev_cmd(PMS_SET_RES);
       pms_dev_cmd(3);         /* 8 counts/mm */
       pms_dev_cmd(PMS_SET_SCALE21);
#if 0
       pms_dev_cmd(PMS_SET_SAMPLE);
       pms_dev_cmd(100);       /* 100 samples/sec */
       pms_dev_cmd(PMS_SET_STREAM);
#endif
       pms_pit_cmd(PMS_INT_ENABLE);

       return 0;
}

int
opmsclose(dev_t dev, int flag, int mode, struct lwp *l)
{
       struct opms_softc *sc = device_lookup_private(&opms_cd, PMSUNIT(dev));

       /* Disable interrupts. */
       pms_dev_cmd(PMS_DEV_DISABLE);
       pms_pit_cmd(PMS_INT_DISABLE);
       pms_aux_cmd(PMS_AUX_DISABLE);

       sc->sc_state &= ~PMS_OPEN;

       clfree(&sc->sc_q);

       return 0;
}

int
opmsread(dev_t dev, struct uio *uio, int flag)
{
       struct opms_softc *sc = device_lookup_private(&opms_cd, PMSUNIT(dev));
       int s;
       int error = 0;
       size_t length;
       u_char buffer[PMS_CHUNK];

       /* Block until mouse activity occurred. */

       s = spltty();
       while (sc->sc_q.c_cc == 0) {
               if (flag & IO_NDELAY) {
                       splx(s);
                       return EWOULDBLOCK;
               }
               sc->sc_state |= PMS_ASLP;
               error = tsleep((void *)sc, PZERO | PCATCH, "pmsrea", 0);
               if (error) {
                       sc->sc_state &= ~PMS_ASLP;
                       splx(s);
                       return error;
               }
       }
       splx(s);

       /* Transfer as many chunks as possible. */

       while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
               length = uimin(sc->sc_q.c_cc, uio->uio_resid);
               if (length > sizeof(buffer))
                       length = sizeof(buffer);

               /* Remove a small chunk from the input queue. */
               (void) q_to_b(&sc->sc_q, buffer, length);

               /* Copy the data to the user process. */
               error = uiomove(buffer, length, uio);
               if (error)
                       break;
       }

       return error;
}

int
opmsioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
{
       struct opms_softc *sc = device_lookup_private(&opms_cd, PMSUNIT(dev));
       struct mouseinfo info;
       int s;
       int error;

       switch (cmd) {
       case MOUSEIOCREAD:
               s = spltty();

               info.status = sc->sc_status;
               if (sc->sc_x || sc->sc_y)
                       info.status |= MOVEMENT;

               if (sc->sc_x > 127)
                       info.xmotion = 127;
               else if (sc->sc_x < -127)
                       /* Bounding at -127 avoids a bug in XFree86. */
                       info.xmotion = -127;
               else
                       info.xmotion = sc->sc_x;

               if (sc->sc_y > 127)
                       info.ymotion = 127;
               else if (sc->sc_y < -127)
                       info.ymotion = -127;
               else
                       info.ymotion = sc->sc_y;

               /* Reset historical information. */
               sc->sc_x = sc->sc_y = 0;
               sc->sc_status &= ~BUTCHNGMASK;
               ndflush(&sc->sc_q, sc->sc_q.c_cc);

               splx(s);
               error = copyout(&info, addr, sizeof(struct mouseinfo));
               break;
       default:
               error = EINVAL;
               break;
       }

       return error;
}

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

int
opmsintr(void *arg)
{
       struct opms_softc *sc = arg;
       static int state = 0;
       static u_char buttons;
       u_char changed;
       static char dx, dy;
       u_char buffer[5];

       if ((sc->sc_state & PMS_OPEN) == 0) {
               /* Interrupts are not expected.  Discard the byte. */
               kbd_flush_input();
               return 0;
       }

       switch (state) {

       case 0:
               buttons = kbd_data_read_1();
               if ((buttons & 0xc0) == 0)
                       ++state;
               break;

       case 1:
               dx = kbd_data_read_1();
               /* Bounding at -127 avoids a bug in XFree86. */
               dx = (dx == -128) ? -127 : dx;
               ++state;
               break;

       case 2:
               dy = kbd_data_read_1();
               dy = (dy == -128) ? -127 : dy;
               state = 0;

               buttons = ((buttons & PS2LBUTMASK) << 2) |
                   ((buttons & (PS2RBUTMASK | PS2MBUTMASK)) >> 1);
               changed = ((buttons ^ sc->sc_status) & BUTSTATMASK) << 3;
               sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) |
                   changed;

               if (dx || dy || changed) {
                       /* Update accumulated movements. */
                       sc->sc_x += dx;
                       sc->sc_y += dy;

                       /* Add this event to the queue. */
                       buffer[0] = 0x80 | (buttons & BUTSTATMASK);
                       if(dx < 0)
                               buffer[0] |= 0x10;
                       buffer[1] = dx & 0x7f;
                       if(dy < 0)
                               buffer[0] |= 0x20;
                       buffer[2] = dy & 0x7f;
                       buffer[3] = buffer[4] = 0;
                       (void) b_to_q(buffer, sizeof buffer, &sc->sc_q);

                       if (sc->sc_state & PMS_ASLP) {
                               sc->sc_state &= ~PMS_ASLP;
                               wakeup((void *)sc);
                       }
                       selnotify(&sc->sc_rsel, 0, 0);
               }

               break;
       }
       return -1;
}

int
opmspoll(dev_t dev, int events, struct lwp *l)
{
       struct opms_softc *sc = device_lookup_private(&opms_cd, PMSUNIT(dev));
       int revents = 0;
       int s = spltty();

       if (events & (POLLIN | POLLRDNORM)) {
               if (sc->sc_q.c_cc > 0)
                       revents |= events & (POLLIN | POLLRDNORM);
               else
                       selrecord(l, &sc->sc_rsel);
       }

       splx(s);
       return revents;
}

static void
filt_opmsrdetach(struct knote *kn)
{
       struct opms_softc *sc = kn->kn_hook;
       int s;

       s = spltty();
       selremove_knote(&sc->sc_rsel, kn);
       splx(s);
}

static int
filt_opmsread(struct knote *kn, long hint)
{
       struct opms_softc *sc = kn->kn_hook;

       kn->kn_data = sc->sc_q.c_cc;
       return kn->kn_data > 0;
}

static const struct filterops opmsread_filtops = {
       .f_flags = FILTEROP_ISFD,
       .f_attach = NULL,
       .f_detach = filt_opmsrdetach,
       .f_event = filt_opmsread,
};

int
opmskqfilter(dev_t dev, struct knote *kn)
{
       struct opms_softc *sc = device_lookup_private(&opms_cd, PMSUNIT(dev));
       int s;

       switch (kn->kn_filter) {
       case EVFILT_READ:
               kn->kn_fop = &opmsread_filtops;
               break;

       default:
               return EINVAL;
       }

       kn->kn_hook = sc;

       s = spltty();
       selrecord_knote(&sc->sc_rsel, kn);
       splx(s);

       return 0;
}

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