/*      $NetBSD: j6x0tp.c,v 1.26 2023/12/20 14:50:02 thorpej Exp $ */

/*
 * Copyright (c) 2003 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: j6x0tp.c,v 1.26 2023/12/20 14:50:02 thorpej Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/callout.h>

#include "opt_j6x0tp.h"

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsmousevar.h>
#include <dev/wscons/wskbdvar.h>
#include <dev/wscons/wsksymvar.h>
#include <dev/wscons/wsksymdef.h>
#include <dev/hpc/hpctpanelvar.h>

#include <machine/platid.h>
#include <machine/platid_mask.h>

#include <machine/intr.h>

#include <sh3/exception.h>
#include <sh3/intcreg.h>
#include <sh3/pfcreg.h>
#include <sh3/adcreg.h>

#include <sh3/dev/adcvar.h>


#if 0 /* XXX: disabled in favor of local version that uses printf_nolog */
#define DPRINTF_ENABLE
#define DPRINTF_DEBUG   j6x0tp_debug
#define DPRINTF_LEVEL   0
#include <machine/debug.h>
#else
#ifdef J6X0TP_DEBUG
volatile int j6x0tp_debug = 0;
#define DPRINTF_PRINTF          printf_nolog
#define DPRINTF(arg)            if (j6x0tp_debug) DPRINTF_PRINTF arg
#define DPRINTFN(n, arg)        if (j6x0tp_debug > (n)) DPRINTF_PRINTF arg
#else
#define DPRINTF(arg)            ((void)0)
#define DPRINTFN(n, arg)        ((void)0)
#endif
#endif


/*
 * PFC bits pertinent to Jornada 6x0 touchpanel
 */
#define PHDR_TP_PEN_DOWN        0x08

#define SCPDR_TP_SCAN_ENABLE    0x20
#define SCPDR_TP_SCAN_Y         0x02
#define SCPDR_TP_SCAN_X         0x01

/*
 * A/D converter channels to get x/y from
 */
#define ADC_CHANNEL_TP_Y        1
#define ADC_CHANNEL_TP_X        2

/*
 * Default (read: my device :) raw X/Y values for framebuffer edges.
 * XXX: defopt these?
 */
#define J6X0TP_FB_LEFT           38
#define J6X0TP_FB_RIGHT         950
#define J6X0TP_FB_TOP            80
#define J6X0TP_FB_BOTTOM        900

/*
 * Bottom of the n'th hard icon (n = 1..4)
 */
#define J6X0TP_HARD_ICON_MAX_Y(n) \
        (J6X0TP_FB_TOP + ((J6X0TP_FB_BOTTOM - J6X0TP_FB_TOP) / 4) * (n))


struct j6x0tp_softc {
        device_t sc_dev;

#define J6X0TP_WSMOUSE_ENABLED  0x01
#define J6X0TP_WSKBD_ENABLED    0x02
        int sc_enabled;

        int sc_hard_icon;

        struct callout sc_touch_ch;

        device_t sc_wsmousedev;
        device_t sc_wskbddev;

        struct tpcalib_softc sc_tpcalib; /* calibration info for wsmouse */
};


/* config machinery */
static int      j6x0tp_match(device_t, cfdata_t, void *);
static void     j6x0tp_attach(device_t, device_t, void *);

/* wsmouse accessops */
static int      j6x0tp_wsmouse_enable(void *);
static int      j6x0tp_wsmouse_ioctl(void *, u_long, void *, int, lwp_t *);
static void     j6x0tp_wsmouse_disable(void *);

/* wskbd accessops */
static int      j6x0tp_wskbd_enable(void *, int);
static void     j6x0tp_wskbd_set_leds(void *, int);
static int      j6x0tp_wskbd_ioctl(void *, u_long, void *, int, lwp_t *);

/* internal driver routines */
static void     j6x0tp_enable(struct j6x0tp_softc *);
static void     j6x0tp_disable(struct j6x0tp_softc *);
static int      j6x0tp_enable_child(struct j6x0tp_softc *, int, int);
static int      j6x0tp_intr(void *);
static void     j6x0tp_start_polling(void *);
static void     j6x0tp_stop_polling(struct j6x0tp_softc *);
static void     j6x0tp_callout_wsmouse(void *);
static void     j6x0tp_callout_wskbd(void *);
static void     j6x0tp_wsmouse_input(struct j6x0tp_softc *, int, int);
static void     j6x0tp_get_raw_xy(int *, int *);
static int      j6x0tp_get_hard_icon(int, int);


static const struct wsmouse_accessops j6x0tp_accessops = {
        j6x0tp_wsmouse_enable,
        j6x0tp_wsmouse_ioctl,
        j6x0tp_wsmouse_disable
};

static const struct wsmouse_calibcoords j6x0tp_default_calib = {
        0, 0, 639, 239,
        4,
        {{ J6X0TP_FB_LEFT,  J6X0TP_FB_TOP,      0,   0 },
         { J6X0TP_FB_RIGHT, J6X0TP_FB_TOP,    639,   0 },
         { J6X0TP_FB_LEFT,  J6X0TP_FB_BOTTOM,   0, 239 },
         { J6X0TP_FB_RIGHT, J6X0TP_FB_BOTTOM, 639, 239 }}
};

static const struct wskbd_accessops j6x0tp_wskbd_accessops = {
        j6x0tp_wskbd_enable,
        j6x0tp_wskbd_set_leds,
        j6x0tp_wskbd_ioctl
};


#ifndef J6X0TP_SETTINGS_ICON_KEYSYM
#define J6X0TP_SETTINGS_ICON_KEYSYM     KS_Home
#endif
#ifndef J6X0TP_PGUP_ICON_KEYSYM
#define J6X0TP_PGUP_ICON_KEYSYM         KS_Prior
#endif
#ifndef J6X0TP_PGDN_ICON_KEYSYM
#define J6X0TP_PGDN_ICON_KEYSYM         KS_Next
#endif
#ifndef J6X0TP_SWITCH_ICON_KEYSYM
#define J6X0TP_SWITCH_ICON_KEYSYM       KS_End
#endif

static const keysym_t j6x0tp_wskbd_keydesc[] = {
        KS_KEYCODE(1), J6X0TP_SETTINGS_ICON_KEYSYM,
        KS_KEYCODE(2), J6X0TP_PGUP_ICON_KEYSYM,
        KS_KEYCODE(3), J6X0TP_PGDN_ICON_KEYSYM,
        KS_KEYCODE(4), J6X0TP_SWITCH_ICON_KEYSYM
};

static const struct wscons_keydesc j6x0tp_wskbd_keydesctab[] = {
        { KB_US, 0,
          sizeof(j6x0tp_wskbd_keydesc)/sizeof(keysym_t),
          j6x0tp_wskbd_keydesc
        },
        {0, 0, 0, 0}
};

static const struct wskbd_mapdata j6x0tp_wskbd_keymapdata = {
        j6x0tp_wskbd_keydesctab, KB_US
};


CFATTACH_DECL_NEW(j6x0tp, sizeof(struct j6x0tp_softc),
    j6x0tp_match, j6x0tp_attach, NULL, NULL);


static int
j6x0tp_match(device_t parent, cfdata_t cf, void *aux)
{

        /*
         * XXX: platid_mask_MACH_HP_LX also matches 360LX.  It's not
         * confirmed whether touch panel in 360LX is connected this
         * way.  We may need to regroup platid masks.
         */
        if (!platid_match(&platid, &platid_mask_MACH_HP_JORNADA_6XX)
            && !platid_match(&platid, &platid_mask_MACH_HP_LX))
                return (0);

        if (strcmp(cf->cf_name, "j6x0tp") != 0)
                return (0);

        return (1);
}


static void
j6x0tp_attach(device_t parent, device_t self, void *aux)
{
        struct j6x0tp_softc *sc;
        struct wsmousedev_attach_args wsma;
        struct wskbddev_attach_args wska;

        aprint_naive("\n");
        aprint_normal("\n");

        sc = device_private(self);
        sc->sc_dev = self;

        sc->sc_enabled = 0;
        sc->sc_hard_icon = 0;

        /* touch-panel as a pointing device */
        wsma.accessops = &j6x0tp_accessops;
        wsma.accesscookie = sc;

        sc->sc_wsmousedev = config_found(self, &wsma, wsmousedevprint,
            CFARGS(.iattr = "wsmousedev"));
        if (sc->sc_wsmousedev == NULL)
                return;

        /* on-screen "hard icons" as a keyboard device */
        wska.console = 0;
        wska.keymap = &j6x0tp_wskbd_keymapdata;
        wska.accessops = &j6x0tp_wskbd_accessops;
        wska.accesscookie = sc;

        sc->sc_wskbddev = config_found(self, &wska, wskbddevprint,
            CFARGS(.iattr = "wskbddev"));

        /* init calibration, set default parameters */
        tpcalib_init(&sc->sc_tpcalib);
        tpcalib_ioctl(&sc->sc_tpcalib, WSMOUSEIO_SCALIBCOORDS,
                      (void *)__UNCONST(&j6x0tp_default_calib), 0, 0);

        /* used when in polling mode */
        callout_init(&sc->sc_touch_ch, 0);

        /* establish interrupt handler, but disable until opened */
        intc_intr_establish(SH7709_INTEVT2_IRQ3, IST_EDGE, IPL_TTY,
                            j6x0tp_intr, sc);
        intc_intr_disable(SH7709_INTEVT2_IRQ3);

        if (!pmf_device_register(self, NULL, NULL))
                aprint_error_dev(self, "unable to establish power handler\n");
}


/*
 * Enable touch panel:  we start in interrupt mode.
 * Must be called as spltty().
 */
static void
j6x0tp_enable(struct j6x0tp_softc *sc)
{

        DPRINTFN(2, ("%s: enable\n", device_xname(sc->sc_dev)));
        intc_intr_enable(SH7709_INTEVT2_IRQ3);
}


/*
 * Disable touch panel: disable interrupt, cancel pending callout.
 * Must be called as spltty().
 */
static void
j6x0tp_disable(struct j6x0tp_softc *sc)
{

        DPRINTFN(2, ("%s: disable\n", device_xname(sc->sc_dev)));
        intc_intr_disable(SH7709_INTEVT2_IRQ3);
        callout_stop(&sc->sc_touch_ch);
}


static int
j6x0tp_enable_child(struct j6x0tp_softc *sc, int child, int on)
{
        int s = spltty();

        if (on) {
                if (!sc->sc_enabled)
                        j6x0tp_enable(sc);
                sc->sc_enabled |= child;
        } else {
                sc->sc_enabled &= ~child;
                if (!sc->sc_enabled)
                        j6x0tp_disable(sc);
        }

        splx(s);
        return (0);
}


static int
j6x0tp_wsmouse_enable(void *arg)
{
        struct j6x0tp_softc *sc = arg;

        DPRINTFN(1, ("%s: wsmouse enable\n", device_xname(sc->sc_dev)));
        return (j6x0tp_enable_child(sc, J6X0TP_WSMOUSE_ENABLED, 1));
}


static void
j6x0tp_wsmouse_disable(void *arg)
{
        struct j6x0tp_softc *sc = arg;

        DPRINTFN(1, ("%s: wsmouse disable\n", device_xname(sc->sc_dev)));
        j6x0tp_enable_child(sc, J6X0TP_WSMOUSE_ENABLED, 0);
}


static int
j6x0tp_wskbd_enable(void *arg, int on)
{
        struct j6x0tp_softc *sc = arg;

        DPRINTFN(1, ("%s: wskbd %sable\n", device_xname(sc->sc_dev),
                     on ? "en" : "dis"));
        return (j6x0tp_enable_child(sc, J6X0TP_WSKBD_ENABLED, on));
}


static int
j6x0tp_intr(void *arg)
{
        struct j6x0tp_softc *sc = arg;

        uint8_t irr0;
        uint8_t phdr, touched;
        unsigned int steady, tremor_timeout;

        irr0 = _reg_read_1(SH7709_IRR0);
        if ((irr0 & IRR0_IRQ3) == 0) {
#ifdef DIAGNOSTIC
                printf("%s: irr0 %02x?\n", device_xname(sc->sc_dev), irr0);
#endif
                return (0);
        }

        if (!sc->sc_enabled) {
                DPRINTFN(1, ("%s: intr: !sc_enabled\n",
                             device_xname(sc->sc_dev)));
                intc_intr_disable(SH7709_INTEVT2_IRQ3);
                goto served;
        }


        /*
         * Number of times the "touched" bit should be read
         * consecutively.
         */
#       define TREMOR_THRESHOLD 0x300

        steady = 0;
        tremor_timeout = TREMOR_THRESHOLD * 16; /* XXX: arbitrary */
        touched = PHDR_TP_PEN_DOWN;     /* we start with "touched" state */

        do {
                phdr = _reg_read_1(SH7709_PHDR);

                if ((phdr & PHDR_TP_PEN_DOWN) == touched)
                        ++steady;
                else {
                        steady = 0;
                        touched = phdr & PHDR_TP_PEN_DOWN;
                }

                if (--tremor_timeout == 0) {
                        DPRINTF(("%s: tremor timeout!\n",
                                 device_xname(sc->sc_dev)));
                        goto served;
                }
        } while (steady < TREMOR_THRESHOLD);

        if (touched) {
                intc_intr_disable(SH7709_INTEVT2_IRQ3);

                /*
                 * ADC readings are not stable yet, so schedule
                 * callout instead of accessing ADC from the interrupt
                 * handler only to immediately delay().
                 */
                callout_reset(&sc->sc_touch_ch, hz/32,
                              j6x0tp_start_polling, sc);
        } else
                DPRINTFN(1, ("%s: tremor\n", device_xname(sc->sc_dev)));
  served:
        /* clear the interrupt (XXX: protect access?) */
        _reg_write_1(SH7709_IRR0, irr0 & ~IRR0_IRQ3);

        return (1);
}


/*
 * Called from the interrupt handler at spltty() upon first touch.
 * Decide if we are going to report this touch as a mouse click/drag
 * or as a key press.
 */
static void
j6x0tp_start_polling(void *arg)
{
        struct j6x0tp_softc *sc = arg;
        uint8_t phdr;
        int do_mouse, do_kbd;
        int rawx, rawy;
        int icon;

        phdr = _reg_read_1(SH7709_PHDR);
        if ((phdr & PHDR_TP_PEN_DOWN) == 0) {
                DPRINTFN(2, ("%s: start: pen is not down\n",
                             device_xname(sc->sc_dev)));
                j6x0tp_stop_polling(sc);
        }

        j6x0tp_get_raw_xy(&rawx, &rawy);
        DPRINTFN(2, ("%s: start: %4d %4d -> ",
                     device_xname(sc->sc_dev), rawx, rawy));

        do_mouse = sc->sc_enabled & J6X0TP_WSMOUSE_ENABLED;
#ifdef J6X0TP_WSMOUSE_EXCLUSIVE
        if (do_mouse)
                do_kbd = 0;
        else
#endif
                do_kbd = sc->sc_enabled & J6X0TP_WSKBD_ENABLED;

        icon = 0;
        if (do_kbd)
                icon = j6x0tp_get_hard_icon(rawx, rawy);

        if (icon != 0) {
                DPRINTFN(2, ("icon %d\n", icon));
                sc->sc_hard_icon = icon;
                wskbd_input(sc->sc_wskbddev, WSCONS_EVENT_KEY_DOWN, icon);
                callout_reset(&sc->sc_touch_ch, hz/32,
                              j6x0tp_callout_wskbd, sc);
        } else if (do_mouse) {
                DPRINTFN(2, ("mouse\n"));
                j6x0tp_wsmouse_input(sc, rawx, rawy);
                callout_reset(&sc->sc_touch_ch, hz/32,
                              j6x0tp_callout_wsmouse, sc);
        } else {
                DPRINTFN(2, ("ignore\n"));
                j6x0tp_stop_polling(sc);
        }
}


/*
 * Re-enable touch panel interrupt.
 * Called as spltty() when polling code detects pen-up.
 */
static void
j6x0tp_stop_polling(struct j6x0tp_softc *sc)
{
        uint8_t irr0;

        DPRINTFN(2, ("%s: stop\n", device_xname(sc->sc_dev)));

        /* clear pending interrupt signal before re-enabling the interrupt */
        irr0 = _reg_read_1(SH7709_IRR0);
        if ((irr0 & IRR0_IRQ3) != 0)
                _reg_write_1(SH7709_IRR0, irr0 & ~IRR0_IRQ3);

        intc_intr_enable(SH7709_INTEVT2_IRQ3);
}


/*
 * We are reporting this touch as a keyboard event.
 * Poll touch screen waiting for pen-up.
 */
static void
j6x0tp_callout_wskbd(void *arg)
{
        struct j6x0tp_softc *sc = arg;
        uint8_t phdr;
        int s;

        s = spltty();

        if (!sc->sc_enabled) {
                DPRINTFN(1, ("%s: wskbd callout: !sc_enabled\n",
                             device_xname(sc->sc_dev)));
                splx(s);
                return;
        }

        phdr = _reg_read_1(SH7709_PHDR);
        if ((phdr & PHDR_TP_PEN_DOWN) != 0) {
                /*
                 * Pen is still down, continue polling.  Wskbd's
                 * auto-repeat takes care of repeating the key.
                 */
                callout_schedule(&sc->sc_touch_ch, hz/32);
        } else {
                wskbd_input(sc->sc_wskbddev,
                            WSCONS_EVENT_KEY_UP, sc->sc_hard_icon);
                j6x0tp_stop_polling(sc);
        }
        splx(s);
}


/*
 * We are reporting this touch as a mouse click/drag.
 */
static void
j6x0tp_callout_wsmouse(void *arg)
{
        struct j6x0tp_softc *sc = arg;
        uint8_t phdr;
        int rawx, rawy;
        int s;

        s = spltty();

        if (!sc->sc_enabled) {
                DPRINTFN(1, ("%s: wsmouse callout: !sc_enabled\n",
                             device_xname(sc->sc_dev)));
                splx(s);
                return;
        }

        phdr = _reg_read_1(SH7709_PHDR);
        if ((phdr & PHDR_TP_PEN_DOWN) != 0) {
                j6x0tp_get_raw_xy(&rawx, &rawy);
                j6x0tp_wsmouse_input(sc, rawx, rawy); /* mouse dragged */
                callout_schedule(&sc->sc_touch_ch, hz/32);
        } else {
                wsmouse_input(sc->sc_wsmousedev, 0, 0, 0, 0, 0, /* button up */
                              WSMOUSE_INPUT_DELTA);
                j6x0tp_stop_polling(sc);
        }
        splx(s);
}


/*
 * Report mouse click/drag.
 */
static void
j6x0tp_wsmouse_input(struct j6x0tp_softc *sc, int rawx, int rawy)
{
        int x, y;

        tpcalib_trans(&sc->sc_tpcalib, rawx, rawy, &x, &y);
                
        DPRINTFN(3, ("%s: %4d %4d -> %3d %3d\n",
                     device_xname(sc->sc_dev), rawx, rawy, x, y));

        wsmouse_input(sc->sc_wsmousedev,
                        1,      /* button */
                        x, y, 0, 0,
                        WSMOUSE_INPUT_ABSOLUTE_X | WSMOUSE_INPUT_ABSOLUTE_Y);
}


/*
 * Read raw X/Y coordinates from the ADC.
 * XXX: protect accesses to SCPDR?
 */
static void
j6x0tp_get_raw_xy(int *rawxp, int *rawyp)
{
        uint8_t scpdr;

        /* Y axis */
        scpdr = _reg_read_1(SH7709_SCPDR);
        scpdr |=  SCPDR_TP_SCAN_ENABLE;
        scpdr &= ~SCPDR_TP_SCAN_Y; /* pull low to scan */
        _reg_write_1(SH7709_SCPDR, scpdr);
        delay(10);

        *rawyp = adc_sample_channel(ADC_CHANNEL_TP_Y);

        /* X axis */
        scpdr = _reg_read_1(SH7709_SCPDR);
        scpdr |=  SCPDR_TP_SCAN_Y;
        scpdr &= ~SCPDR_TP_SCAN_X; /* pull low to scan */
        _reg_write_1(SH7709_SCPDR, scpdr);
        delay(10);

        *rawxp = adc_sample_channel(ADC_CHANNEL_TP_X);

        /* restore SCPDR */
        scpdr = _reg_read_1(SH7709_SCPDR);
        scpdr |=  SCPDR_TP_SCAN_X;
        scpdr &= ~SCPDR_TP_SCAN_ENABLE;
        _reg_write_1(SH7709_SCPDR, scpdr);
}


/*
 * Check if the (rawx, rawy) is inside one of the 4 hard icons.
 * Return the icon number 1..4, or 0 if not inside an icon.
 */
static int
j6x0tp_get_hard_icon(int rawx, int rawy)
{
        if (rawx <= J6X0TP_FB_RIGHT)
                return (0);

        if (rawy < J6X0TP_HARD_ICON_MAX_Y(1))
                return (1);
        else if (rawy < J6X0TP_HARD_ICON_MAX_Y(2))
                return (2);
        else if (rawy < J6X0TP_HARD_ICON_MAX_Y(3))
                return (3);
        else
                return (4);
}


static int
j6x0tp_wsmouse_ioctl(void *arg, u_long cmd, void *data, int flag, lwp_t *l)
{
        struct j6x0tp_softc *sc = arg;

        return hpc_tpanel_ioctl(&sc->sc_tpcalib, cmd, data, flag, l);
}


static int
j6x0tp_wskbd_ioctl(void *arg, u_long cmd, void *data, int flag, lwp_t *l)
{
        /* struct j6x0tp_softc *sc = arg; */

        switch (cmd) {
        case WSKBDIO_GTYPE:
                *(int *)data = WSKBD_TYPE_HPC_BTN; /* may be use new type? */
                return (0);

        case WSKBDIO_GETLEDS:
                *(int *)data = 0;
                return (0);

        default:
                return (EPASSTHROUGH);
        }
}


static void
j6x0tp_wskbd_set_leds(void *arg, int leds)
{

        /* nothing to do*/
        return;
}