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Initial revision

/*	$OpenBSD: zaurus_remote.c,v 1.1 2005/11/17 05:26:31 uwe Exp $	*/

/*
 * Copyright (c) 2005 Uwe Stuehler <uwe@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

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

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wskbdraw.h>
#include <dev/wscons/wskbdvar.h>
#include <dev/wscons/wsksymdef.h>
#include <dev/wscons/wsksymvar.h>

#include <machine/intr.h>
#include <machine/zaurus_var.h>

#include <arm/xscale/pxa2x0reg.h>
#include <arm/xscale/pxa2x0_gpio.h>

#include <zaurus/dev/zaurus_scoopvar.h>
#include <zaurus/dev/zaurus_sspvar.h>

#define RESCAN_INTERVAL		(hz/100)

#define KEY_RELEASE		0	/* button release */
#define KEY_VOL_DOWN		1
#define KEY_MUTE		2
#define KEY_REWIND		3
#define KEY_VOL_UP		4
#define KEY_FORWARD		5
#define KEY_PLAY		6
#define KEY_STOP		7
#define KEY_EARPHONE		8

#ifdef DEBUG
static const char *zrc_keyname[] = {
	"(release)", "volume down", "mute", "rewind", "volume up",
	"forward", "play", "stop", "(earphone)"
};
#endif

struct zrc_akey {
	int	min;		/* minimum ADC value or INT_MIN */
	int	key;		/* remote control key number */
};

/* Values match the resistors in the CE-RH2 remote control. */
static const struct zrc_akey zrc_akeytab_c3000[] = {
	{ 238,		KEY_RELEASE  },
	{ 202,		KEY_VOL_DOWN },
	{ 168,		KEY_MUTE     },
	{ 135,		KEY_REWIND   },
	{ 105,		KEY_VOL_UP   },
	{ 74,		KEY_FORWARD  },
	{ 42,		KEY_PLAY     },
	{ 12,		KEY_STOP     },
	{ INT_MIN,	KEY_EARPHONE }
};

static const struct zrc_akey *zrc_akeytab = zrc_akeytab_c3000;

struct zrc_softc {
	struct device	 sc_dev;
	struct timeout	 sc_to;
	void		*sc_ih;
	int		 sc_key;	/* being scanned */
	int		 sc_scans;	/* rescan counter */
	int		 sc_noise;	/* discard if too noisy? */
	int		 sc_keydown;	/* currently pressed key */
	struct device   *sc_wskbddev;
#ifdef WSDISPLAY_COMPAT_RAWKBD
	int		 sc_rawkbd;
#endif
};

int	zrc_match(struct device *, void *, void *);
void	zrc_attach(struct device *, struct device *, void *);

int	zrc_intr(void *);
void	zrc_timeout(void *);
int	zrc_scan(void);
void	zrc_input(struct zrc_softc *, int, int);

struct cfattach zrc_ca = {
	sizeof(struct zrc_softc), zrc_match, zrc_attach
};

struct cfdriver zrc_cd = {
	NULL, "zrc", DV_DULL
};

int	zrc_enable(void *, int);
void	zrc_set_leds(void *, int);
int	zrc_ioctl(void *, u_long, caddr_t, int, struct proc *);

struct wskbd_accessops zrc_accessops = {
	zrc_enable,
	zrc_set_leds,
	zrc_ioctl,
};

#define KC(n) KS_KEYCODE(n)

/* XXX what keys should be generated in translated mode? */
static const keysym_t zrc_keydesc[] = {
	KC(KEY_VOL_DOWN),	KS_minus,
	KC(KEY_MUTE),		KS_m,
	KC(KEY_REWIND),		KS_b,
	KC(KEY_VOL_UP),		KS_plus,
	KC(KEY_FORWARD),	KS_f,
	KC(KEY_PLAY),		KS_p,
	KC(KEY_STOP),		KS_s,
};

#ifdef WSDISPLAY_COMPAT_RAWKBD
#define	RAWKEY_AudioRewind	0xa0
#define	RAWKEY_AudioForward	0xa1
#define	RAWKEY_AudioPlay	0xa2
#define	RAWKEY_AudioStop	0xa3
static const keysym_t zrc_xt_keymap[] = {
	/* KC(KEY_RELEASE), */	RAWKEY_Null,
	/* KC(KEY_VOL_DOWN), */	RAWKEY_AudioLower,
	/* KC(KEY_MUTE), */	RAWKEY_AudioMute,
	/* KC(KEY_REWIND), */	RAWKEY_AudioRewind,
	/* KC(KEY_VOL_UP), */	RAWKEY_AudioRaise,
	/* KC(KEY_FORWARD), */	RAWKEY_AudioForward,
	/* KC(KEY_PLAY), */	RAWKEY_AudioPlay,
	/* KC(KEY_STOP), */	RAWKEY_AudioStop,
};
#endif

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

struct wskbd_mapdata zrc_keymapdata = {
	zrc_keydesctab, KB_US
};


int
zrc_match(struct device *parent, void *match, void *aux)
{
	return (ZAURUS_ISC3000);
}

void
zrc_attach(struct device *parent, struct device *self, void *aux)
{
	struct zrc_softc *sc = (struct zrc_softc *)self;
	struct wskbddev_attach_args a;

	/* Configure remote control interrupt handling. */
	timeout_set(&sc->sc_to, zrc_timeout, sc);
	pxa2x0_gpio_set_function(C3000_RC_IRQ_PIN, GPIO_IN);
	sc->sc_ih = pxa2x0_gpio_intr_establish(C3000_RC_IRQ_PIN,
	    IST_EDGE_BOTH, IPL_BIO, zrc_intr, sc, "zrc");
	
	/* Enable the pullup while waiting for an interrupt. */
	scoop_akin_pullup(1);

	sc->sc_keydown = KEY_RELEASE;

	printf(": CE-RH2 remote control\n");

	a.console = 0;
	a.keymap = &zrc_keymapdata;
	a.accessops = &zrc_accessops;
	a.accesscookie = sc;

	sc->sc_wskbddev = config_found(self, &a, wskbddevprint);
}

int
zrc_intr(void *v)
{
	struct zrc_softc *sc = v;

	/* just return if remote control isn't present */

	pxa2x0_gpio_intr_mask(sc->sc_ih);
	scoop_akin_pullup(0);
	sc->sc_key = zrc_scan();
	sc->sc_scans = 0;
	sc->sc_noise = 0;
	timeout_add(&sc->sc_to, RESCAN_INTERVAL);
	return (1);
}

void
zrc_timeout(void *v)
{
	struct zrc_softc *sc = v;
	int	key;

	key = zrc_scan();
	switch (sc->sc_scans) {
	case 0:
	case 1:
	case 2:
		/* wait for a stable read */
		if (sc->sc_key == key)
			sc->sc_scans++;
		else {
			sc->sc_key = key;
			sc->sc_scans = 0;
			sc->sc_noise++;
		}
		timeout_add(&sc->sc_to, RESCAN_INTERVAL);
		break;
	case 3:
		/* generate key press event */
		if (sc->sc_key != key) {
			key = sc->sc_key;
			sc->sc_noise++;
		}
		sc->sc_scans++;
		switch (key) {
		case KEY_EARPHONE:
		case KEY_RELEASE:
			sc->sc_scans = 6;
			break;
		default:
#ifdef DEBUG
			printf("%s pressed (%d noise)\n", zrc_keyname[key],
			    sc->sc_noise);
#endif
			sc->sc_keydown = key;
			sc->sc_noise = 0;
			zrc_input(sc, key, 1);
			break;
		}
		timeout_add(&sc->sc_to, RESCAN_INTERVAL);
		break;
	case 4:
	case 5:
		/* wait for key release, permit noise */
		if (sc->sc_key == key) {
			if (sc->sc_scans == 5)
				sc->sc_noise++;
			sc->sc_scans = 4;
		} else
			sc->sc_scans++;
		timeout_add(&sc->sc_to, RESCAN_INTERVAL);
		break;
	case 6:
		/* generate key release event */
		if (sc->sc_keydown != KEY_RELEASE) {
			zrc_input(sc, sc->sc_keydown, 0);
#ifdef DEBUG
			printf("%s released (%d noise)\n",
			    zrc_keyname[sc->sc_keydown], sc->sc_noise);
#endif
			sc->sc_keydown = KEY_RELEASE;
		}
		/* FALLTHROUGH */
	default:
		/* unmask interrupt again */
		timeout_del(&sc->sc_to);
		sc->sc_scans = 7;
		scoop_akin_pullup(1);
		pxa2x0_gpio_intr_unmask(sc->sc_ih);
	}
}

int
zrc_scan(void)
{
	int	val;
	int	i;

/* XXX MAX1111 command word - also appears in zaurus_apm.c */
#define MAXCTRL_PD0		(1<<0)
#define MAXCTRL_PD1		(1<<1)
#define MAXCTRL_SGL		(1<<2)
#define MAXCTRL_UNI		(1<<3)
#define MAXCTRL_SEL_SHIFT	4
#define MAXCTRL_STR		(1<<7)

#define C3000_ADCCH_ZRC 0
	val = zssp_read_max1111(MAXCTRL_PD0 | MAXCTRL_PD1 | MAXCTRL_SGL |
	    MAXCTRL_UNI | (C3000_ADCCH_ZRC << MAXCTRL_SEL_SHIFT) |
	    MAXCTRL_STR);
	for (i = 0; zrc_akeytab[i].min != INT_MIN; i++)
		if (val >= zrc_akeytab[i].min)
			break;
	return (zrc_akeytab[i].key);
}

void
zrc_input(struct zrc_softc *sc, int key, int down)
{
	u_int	type = down ? WSCONS_EVENT_KEY_DOWN : WSCONS_EVENT_KEY_UP;
	int	s;

	s = spltty();

#ifdef WSDISPLAY_COMPAT_RAWKBD
	if (sc->sc_rawkbd) {
		int	c;
		u_char	cbuf[2];
		int	ncbuf = 0;

		c = zrc_xt_keymap[key];
		if (c & 0x80)
			cbuf[ncbuf++] = 0xe0;
		cbuf[ncbuf] = c & 0x7f;

		if (!down)
			cbuf[ncbuf] |= 0x80;
		ncbuf++;

		wskbd_rawinput(sc->sc_wskbddev, cbuf, ncbuf);
	} else
#endif
		wskbd_input(sc->sc_wskbddev, type, key);

	splx(s);
}

int
zrc_enable(void *v, int on)
{
	return (0);
}

void
zrc_set_leds(void *v, int on)
{
}

int
zrc_ioctl(void *v, u_long cmd, caddr_t data, int flag, struct proc *p)
{
#ifdef WSDISPLAY_COMPAT_RAWKBD
	struct zrc_softc *sc = v;
#endif

	switch (cmd) {
	case WSKBDIO_GTYPE:
		*(int *)data = WSKBD_TYPE_ZAURUS;
		return (0);
	case WSKBDIO_SETLEDS:
		return (0);
	case WSKBDIO_GETLEDS:
		*(int *)data = 0;
		return (0);
#ifdef WSDISPLAY_COMPAT_RAWKBD
	case WSKBDIO_SETMODE:
		sc->sc_rawkbd = *(int *)data == WSKBD_RAW;
		return (0);
#endif
	}
	return (-1);
}