/*      $NetBSD: lcdctl.c,v 1.3 2012/01/29 10:12:41 tsutsui Exp $       */

/*-
* Copyright (C) 2012 NONAKA Kimihiro <[email protected]>
* 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.
*
* 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: lcdctl.c,v 1.3 2012/01/29 10:12:41 tsutsui Exp $");

#include "ioexp.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/bus.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>

#include <zaurus/zaurus/zaurus_var.h>
#include <zaurus/dev/lcdctlvar.h>
#include <zaurus/dev/zsspvar.h>
#include <zaurus/dev/scoopvar.h>
#include <zaurus/dev/ioexpvar.h>

struct lcdctl_backlight {
       int     duty;           /* LZ9JG18 DAC value */
       int     cont;           /* BACKLIGHT_CONT signal */
       int     on;             /* BACKLIGHT_ON signal */
};

struct lcdctl_softc {
       device_t        sc_dev;

       int             sc_brightness;
       int             sc_brightnesscurval;
       bool            sc_islit;
       bool            sc_isblank;

       int             sc_nbacklighttbl;
       const struct lcdctl_backlight *sc_backlighttbl;
};

/* for SL-C1000/SL-C3x00 */
static const struct lcdctl_backlight lcdctl_backlight_c3000[] = {
       { 0x00, 0,  0 },        /* 0:  Off */
       { 0x00, 0,  1 },        /* 1:   0% */
       { 0x01, 0,  1 },        /* 2:  20% */
       { 0x07, 0,  1 },        /* 3:  40% */
       { 0x01, 1,  1 },        /* 4:  60% */
       { 0x07, 1,  1 },        /* 5:  80% */
       { 0x11, 1,  1 }         /* 6: 100% */
};

static int      lcdctl_match(device_t, cfdata_t, void *);
static void     lcdctl_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(lcdctl, sizeof(struct lcdctl_softc),
       lcdctl_match, lcdctl_attach, NULL, NULL);

static void lcdctl_brightness_up(device_t);
static void lcdctl_brightness_down(device_t);
static void lcdctl_display_on(device_t);
static void lcdctl_display_off(device_t);

static void lcdctl_set_brightness(struct lcdctl_softc *, int);
static void lcdctl_set_blank(struct lcdctl_softc *, bool);
static void lcdctl_set_backlight(struct lcdctl_softc *, bool);

static struct lcdctl_softc *lcdctl_sc;

static int
lcdctl_match(device_t parent, cfdata_t cf, void *aux)
{
       struct zssp_attach_args *aa = aux;

       if (strcmp("lcdctl", aa->zaa_name))
               return 0;

       return 1;
}

static void
lcdctl_attach(device_t parent, device_t self, void *aux)
{
       struct lcdctl_softc *sc = device_private(self);

       sc->sc_dev = self;

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

       sc->sc_brightness = sc->sc_brightnesscurval = 1;
       sc->sc_islit = true;
       sc->sc_isblank = false;

       if (ZAURUS_ISC1000 || ZAURUS_ISC3000) {
               sc->sc_nbacklighttbl = __arraycount(lcdctl_backlight_c3000);
               sc->sc_backlighttbl = lcdctl_backlight_c3000;
       } else {
               /* XXX: Is this okay for C7x0/860? */
               sc->sc_nbacklighttbl = __arraycount(lcdctl_backlight_c3000);
               sc->sc_backlighttbl = lcdctl_backlight_c3000;
       }

       /* Start with approximately 40% of full brightness. */
       lcdctl_set_brightness(sc, 3);

       lcdctl_sc = sc;

       if (!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_UP,
           lcdctl_brightness_up, true))
               aprint_error_dev(self, "couldn't register event handler\n");
       if (!pmf_event_register(self, PMFE_DISPLAY_BRIGHTNESS_DOWN,
           lcdctl_brightness_down, true))
               aprint_error_dev(self, "couldn't register event handler\n");
       if (!pmf_event_register(self, PMFE_DISPLAY_ON,
           lcdctl_display_on, true))
               aprint_error_dev(self, "couldn't register event handler\n");
       if (!pmf_event_register(self, PMFE_DISPLAY_OFF,
           lcdctl_display_off, true))
               aprint_error_dev(self, "couldn't register event handler\n");
}

static void
lcdctl_brightness_up(device_t dv)
{
       struct lcdctl_softc *sc = device_private(dv);

       lcdctl_set_brightness(sc, sc->sc_brightness + 1);
}

static void
lcdctl_brightness_down(device_t dv)
{
       struct lcdctl_softc *sc = device_private(dv);

       lcdctl_set_brightness(sc, sc->sc_brightness - 1);
}

static void
lcdctl_display_on(device_t dv)
{
       struct lcdctl_softc *sc = device_private(dv);

       lcdctl_set_blank(sc, false);
       lcdctl_set_backlight(sc, true);
}

static void
lcdctl_display_off(device_t dv)
{
       struct lcdctl_softc *sc = device_private(dv);

       lcdctl_set_backlight(sc, false);
       lcdctl_set_blank(sc, true);
}

static __inline void
set_backlight(const struct lcdctl_backlight *bl)
{

       (void) zssp_ic_send(ZSSP_IC_LZ9JG18, bl->duty);
       if (ZAURUS_ISC1000)
               ioexp_set_backlight(bl->on, bl->cont);
       else
               scoop_set_backlight(bl->on, bl->cont);
}

static void
lcdctl_set_brightness_internal(struct lcdctl_softc *sc, int newval)
{
       int i;

       /*
        * It appears that the C3000 backlight can draw too much power if we
        * switch it from a low to a high brightness.  Increasing brightness
        * in steps avoids this issue.
        */
       if (newval > sc->sc_brightnesscurval) {
               for (i = sc->sc_brightnesscurval + 1; i <= newval; i++) {
                       set_backlight(&sc->sc_backlighttbl[i]);
                       delay(5000);
               }
       } else
               set_backlight(&sc->sc_backlighttbl[newval]);

       sc->sc_brightnesscurval = newval;
}

static void
lcdctl_set_brightness(struct lcdctl_softc *sc, int newval)
{
       int maxval = sc->sc_nbacklighttbl - 1;

       if (newval < 0)
               newval = 0;
       else if (newval > maxval)
               newval = maxval;

       if (sc->sc_islit && !sc->sc_isblank)
               lcdctl_set_brightness_internal(sc, newval);

       if (newval > 0)
               sc->sc_brightness = newval;
}

static void
lcdctl_set_backlight(struct lcdctl_softc *sc, bool onoff)
{

       if (!onoff) {
               lcdctl_set_brightness(sc, 0);
               sc->sc_islit = false;
       } else {
               sc->sc_islit = true;
               lcdctl_set_brightness(sc, sc->sc_brightness);
       }
}

static void
lcdctl_set_blank(struct lcdctl_softc *sc, bool isblank)
{

       if (isblank) {
               lcdctl_set_brightness(sc, 0);
               sc->sc_isblank = true;
       } else {
               sc->sc_isblank = false;
               lcdctl_set_brightness(sc, sc->sc_brightness);
       }
}

static void
lcdctl_set_onoff(struct lcdctl_softc *sc, bool onoff)
{

       if (!onoff) {
               lcdctl_set_brightness(sc, 0);
       } else {
               lcdctl_set_brightness(sc, sc->sc_brightness);
       }
}

static int
lcdctl_param_ioctl(struct lcdctl_softc *sc, u_long cmd, struct wsdisplay_param *dp)
{
       int rv = EINVAL;

       switch (dp->param) {
       case WSDISPLAYIO_PARAM_BACKLIGHT:
               if (cmd == WSDISPLAYIO_GETPARAM) {
                       dp->min = 0;
                       dp->max = 1;
                       dp->curval = sc->sc_islit ? 1 : 0;
                       rv = 0;
               } else if (cmd == WSDISPLAYIO_SETPARAM) {
                       lcdctl_set_backlight(sc, dp->curval != 0);
                       rv = 0;
               }
               break;

       case WSDISPLAYIO_PARAM_CONTRAST:
               /* unsupported */
               rv = ENOTTY;
               break;

       case WSDISPLAYIO_PARAM_BRIGHTNESS:
               if (cmd == WSDISPLAYIO_GETPARAM) {
                       dp->min = 1;
                       dp->max = sc->sc_nbacklighttbl - 1;
                       dp->curval = sc->sc_brightness;
                       rv = 0;
               } else if (cmd == WSDISPLAYIO_SETPARAM) {
                       lcdctl_set_brightness(sc, dp->curval);
                       rv = 0;
               }
               break;
       }
       return rv;
}

void
lcdctl_brightness(int newval)
{

       if (__predict_true(lcdctl_sc != NULL))
               lcdctl_set_brightness(lcdctl_sc, newval);
}

void
lcdctl_blank(bool isblank)
{

       if (__predict_true(lcdctl_sc != NULL))
               lcdctl_set_blank(lcdctl_sc, isblank);
}

void
lcdctl_onoff(bool onoff)
{

       if (__predict_true(lcdctl_sc != NULL))
               lcdctl_set_onoff(lcdctl_sc, onoff);
}

int
lcdctl_param(u_long cmd, struct wsdisplay_param *dp)
{

       if (__predict_true(lcdctl_sc != NULL))
               return lcdctl_param_ioctl(lcdctl_sc, cmd, dp);
       return ENOTTY;  /* unsupported */
}

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