/* $NetBSD: lcdpanel.c,v 1.1 2018/04/09 20:16:16 christos Exp $ */

/*
 * Copyright (c) 2002 Dennis I. Chernoivanov
 * 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: lcdpanel.c,v 1.1 2018/04/09 20:16:16 christos Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/poll.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/callout.h>
#include <sys/select.h>
#include <sys/reboot.h>

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

#include <dev/ic/hd44780reg.h>
#include <dev/ic/hd44780var.h>
#include <dev/ic/lcdkp_subr.h>

#include "ioconf.h"

#define LCDPANEL_POLLRATE       (hz / 10)
#define LCDPANEL_REGION 0x20
#define DATA_OFFSET     0x10
#define LCDPANEL_COLS   16
#define LCDPANEL_VCOLS  40
#define LCDPANEL_ROWS   2

struct lcdpanel_softc {
        device_t sc_dev;

        struct hd44780_chip sc_lcd;
        struct lcdkp_chip sc_kp;

        struct selinfo sc_selq;
        struct callout sc_callout;
};

struct lcd_message {
        const char firstcol[LCDPANEL_VCOLS];
        const char secondcol[LCDPANEL_VCOLS];
};
static const struct lcd_message startup_message = {
        "NetBSD/cobalt   ",
        "Starting up...  "
};
static const struct lcd_message halt_message = {
        "NetBSD/cobalt   ",
        "Halting...      "
};
static const struct lcd_message reboot_message = {
        "NetBSD/cobalt   ",
        "Rebooting...    "
};

static int      lcdpanel_match(device_t, cfdata_t, void *);
static void     lcdpanel_attach(device_t, device_t, void *);
static bool     lcdpanel_shutdown(device_t, int);

static void     lcdpanel_soft(void *);

static uint8_t  lcdpanel_cbt_kprread(bus_space_tag_t, bus_space_handle_t);
static uint8_t  lcdpanel_cbt_hdreadreg(struct hd44780_chip *, uint32_t, uint32_t);
static void     lcdpanel_cbt_hdwritereg(struct hd44780_chip *, uint32_t, uint32_t,
    uint8_t);

dev_type_open(lcdpanelopen);
dev_type_close(lcdpanelclose);
dev_type_read(lcdpanelread);
dev_type_write(lcdpanelwrite);
dev_type_ioctl(lcdpanelioctl);
dev_type_poll(lcdpanelpoll);

const struct cdevsw lcdpanel_cdevsw = {
        .d_open = lcdpanelopen,
        .d_close = lcdpanelclose,
        .d_read = lcdpanelread,
        .d_write = lcdpanelwrite,
        .d_ioctl = lcdpanelioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = lcdpanelpoll,
        .d_mmap = nommap,
        .d_kqfilter = nokqfilter,
        .d_discard = nodiscard,
        .d_flag = 0
};

CFATTACH_DECL_NEW(lcdpanel, sizeof(struct lcdpanel_softc),
    lcdpanel_match, lcdpanel_attach, NULL, NULL);

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

        return 1;
}

static void
lcdpanel_attach(device_t parent, device_t self, void *aux)
{
        struct lcdpanel_softc *sc = device_private(self);
        struct mainbus_attach_args *maa = aux;
        struct hd44780_io io;
        static struct lcdkp_xlate keys[] = {
                { 0xfa, 'h' },
                { 0xf6, 'k' },
                { 0xde, 'l' },
                { 0xee, 'j' },
                { 0x7e, 's' },
                { 0xbe, 'e' }
        };

        sc->sc_lcd.sc_dev = self;
        sc->sc_lcd.sc_iot = maa->ma_iot;
        if (bus_space_map(sc->sc_lcd.sc_iot, maa->ma_addr, LCDPANEL_REGION,
            0, &sc->sc_lcd.sc_ioir)) {
                aprint_error(": unable to map registers\n");
                return;
        }
        bus_space_subregion(sc->sc_lcd.sc_iot, sc->sc_lcd.sc_ioir, DATA_OFFSET,
            1, &sc->sc_lcd.sc_iodr);

        printf("\n");

        sc->sc_lcd.sc_dev_ok = 1;
        sc->sc_lcd.sc_cols = LCDPANEL_COLS;
        sc->sc_lcd.sc_vcols = LCDPANEL_VCOLS;
        sc->sc_lcd.sc_flags = HD_8BIT | HD_MULTILINE | HD_KEYPAD;

        sc->sc_lcd.sc_writereg = lcdpanel_cbt_hdwritereg;
        sc->sc_lcd.sc_readreg = lcdpanel_cbt_hdreadreg;

        hd44780_attach_subr(&sc->sc_lcd);

        /* Hello World */
        io.dat = 0;
        io.len = LCDPANEL_VCOLS * LCDPANEL_ROWS;
        memcpy(io.buf, &startup_message, io.len);
        hd44780_ddram_io(&sc->sc_lcd, sc->sc_lcd.sc_curchip, &io,
            HD_DDRAM_WRITE);

        pmf_device_register1(self, NULL, NULL, lcdpanel_shutdown);

        sc->sc_kp.sc_iot = maa->ma_iot;
        sc->sc_kp.sc_ioh = MIPS_PHYS_TO_KSEG1(LCDPANEL_BASE); /* XXX */

        sc->sc_kp.sc_knum = sizeof(keys) / sizeof(struct lcdkp_xlate);
        sc->sc_kp.sc_kpad = keys;
        sc->sc_kp.sc_rread = lcdpanel_cbt_kprread;

        lcdkp_attach_subr(&sc->sc_kp);

        callout_init(&sc->sc_callout, 0);
        selinit(&sc->sc_selq);
}

static bool
lcdpanel_shutdown(device_t self, int howto)
{
        struct lcdpanel_softc *sc = device_private(self);
        struct hd44780_io io;

        /* Goodbye World */
        io.dat = 0;
        io.len = LCDPANEL_VCOLS * LCDPANEL_ROWS;
        if (howto & RB_HALT)
                memcpy(io.buf, &halt_message, io.len);
        else
                memcpy(io.buf, &reboot_message, io.len);
        hd44780_ddram_io(&sc->sc_lcd, sc->sc_lcd.sc_curchip, &io,
            HD_DDRAM_WRITE);

        return true;
}

static uint8_t
lcdpanel_cbt_kprread(bus_space_tag_t iot, bus_space_handle_t ioh)
{

        delay(HD_TIMEOUT_NORMAL);
        return (bus_space_read_4(iot, ioh, 0x00) >> 24) & 0xff;
}


static void
lcdpanel_cbt_hdwritereg(struct hd44780_chip *hd, uint32_t en, uint32_t rs,
    uint8_t dat)
{

        if (rs)
                bus_space_write_4(hd->sc_iot, hd->sc_iodr, 0x00, dat << 24);
        else
                bus_space_write_4(hd->sc_iot, hd->sc_ioir, 0x00, dat << 24);
        delay(HD_TIMEOUT_NORMAL);
}

static uint8_t
lcdpanel_cbt_hdreadreg(struct hd44780_chip *hd, uint32_t en, uint32_t rs)
{

        delay(HD_TIMEOUT_NORMAL);
        if (rs)
                return (bus_space_read_4(hd->sc_iot, hd->sc_iodr, 0x00) >> 24)
                    & 0xff;
        else
                return (bus_space_read_4(hd->sc_iot, hd->sc_ioir, 0x00) >> 24)
                    & 0xff;
}

int
lcdpanelopen(dev_t dev, int flag, int mode, struct lwp *l)
{
        struct lcdpanel_softc *sc = device_lookup_private(&lcdpanel_cd, minor(dev));

        return (sc->sc_lcd.sc_dev_ok == 0) ? ENXIO : 0;
}

int
lcdpanelclose(dev_t dev, int flag, int mode, struct lwp *l)
{
        struct lcdpanel_softc *sc = device_lookup_private(&lcdpanel_cd, minor(dev));

        selnotify(&sc->sc_selq, 0, 0);
        return 0;
}

int
lcdpanelread(dev_t dev, struct uio *uio, int flag)
{
        int error;
        uint8_t b;
        struct lcdpanel_softc *sc = device_lookup_private(&lcdpanel_cd, minor(dev));

        if (uio->uio_resid < sizeof(b))
                return EIO;

        if ((error = lcdkp_readkey(&sc->sc_kp, &b)) != 0)
                return error;

        return uiomove((void*)&b, sizeof(b), uio);
}

int
lcdpanelwrite(dev_t dev, struct uio *uio, int flag)
{
        int error;
        struct hd44780_io io;
        struct lcdpanel_softc *sc = device_lookup_private(&lcdpanel_cd, minor(dev));

        io.dat = 0;
        io.len = uio->uio_resid;
        if (io.len > HD_MAX_CHARS)
                io.len = HD_MAX_CHARS;

        if ((error = uiomove((void*)io.buf, io.len, uio)) != 0)
                return error;

        hd44780_ddram_redraw(&sc->sc_lcd, 0, &io);
        return 0;
}

int
lcdpanelioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
        struct lcdpanel_softc *sc = device_lookup_private(&lcdpanel_cd, minor(dev));

        return hd44780_ioctl_subr(&sc->sc_lcd, cmd, data);
}

int
lcdpanelpoll(dev_t dev, int events, struct lwp *l)
{
        int revents = 0;

        if ((events & (POLLIN | POLLRDNORM)) != 0) {
                struct lcdpanel_softc *sc;

                sc = device_lookup_private(&lcdpanel_cd, minor(dev));
                if (lcdkp_scankey(&sc->sc_kp) != 0) {
                        revents = events & (POLLIN | POLLRDNORM);
                } else {
                        selrecord(l, &sc->sc_selq);
                        callout_reset(&sc->sc_callout, LCDPANEL_POLLRATE,
                                        lcdpanel_soft, sc);
                }
        }

        return revents;
}

static void
lcdpanel_soft(void *arg)
{
        struct lcdpanel_softc *sc = arg;

        if (lcdkp_scankey(&sc->sc_kp) != 0)
                selnotify(&sc->sc_selq, 0, 0);
        else
                callout_reset(&sc->sc_callout, LCDPANEL_POLLRATE, lcdpanel_soft, sc);
}