/*
 * Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk>
 * 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 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 AUTHOR 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.
 *
 * $FreeBSD$
 */

#include <dev/sound/pcm/sound.h>

#include "mixer_if.h"

MALLOC_DEFINE(M_MIXER, "mixer", "mixer");

static u_int16_t snd_mixerdefaults[SOUND_MIXER_NRDEVICES] = {
	[SOUND_MIXER_VOLUME]	= 75,
	[SOUND_MIXER_BASS]	= 50,
	[SOUND_MIXER_TREBLE]	= 50,
	[SOUND_MIXER_SYNTH]	= 75,
	[SOUND_MIXER_PCM]	= 75,
	[SOUND_MIXER_SPEAKER]	= 75,
	[SOUND_MIXER_LINE]	= 75,
	[SOUND_MIXER_MIC] 	= 0,
	[SOUND_MIXER_CD]	= 75,
	[SOUND_MIXER_LINE1]	= 75,
	[SOUND_MIXER_VIDEO]	= 75,
	[SOUND_MIXER_RECLEV]	= 0,
	[SOUND_MIXER_OGAIN]	= 50,
};

static char* snd_mixernames[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;

#ifdef SND_DYNSYSCTL
static int
mixer_lookup(char *devname)
{
	int i;

	for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
		if (strncmp(devname, snd_mixernames[i],
		    strlen(snd_mixernames[i])) == 0)
			return i;
	return -1;
}
#endif

static int
mixer_set(snd_mixer *mixer, unsigned dev, unsigned lev)
{
	unsigned l, r;
	int v;

	if ((dev >= SOUND_MIXER_NRDEVICES) || (0 == (mixer->devs & (1 << dev))))
		return -1;

	l = min((lev & 0x00ff), 100);
	r = min(((lev & 0xff00) >> 8), 100);

	v = MIXER_SET(mixer, dev, l, r);
	if (v < 0)
		return -1;

	mixer->level[dev] = l | (r << 8);
	return 0;
}

static int
mixer_get(snd_mixer *mixer, int dev)
{
	if ((dev < SOUND_MIXER_NRDEVICES) && (mixer->devs & (1 << dev)))
		return mixer->level[dev];
	else return -1;
}

static int
mixer_setrecsrc(snd_mixer *mixer, u_int32_t src)
{
	src &= mixer->recdevs;
	if (src == 0)
		src = SOUND_MASK_MIC;
	mixer->recsrc = MIXER_SETRECSRC(mixer, src);
	return 0;
}

static int
mixer_getrecsrc(snd_mixer *mixer)
{
	return mixer->recsrc;
}

void
mix_setdevs(snd_mixer *m, u_int32_t v)
{
	m->devs = v;
}

void
mix_setrecdevs(snd_mixer *m, u_int32_t v)
{
	m->recdevs = v;
}

u_int32_t
mix_getdevs(snd_mixer *m)
{
	return m->devs;
}

u_int32_t
mix_getrecdevs(snd_mixer *m)
{
	return m->recdevs;
}

void *
mix_getdevinfo(snd_mixer *m)
{
	return m->devinfo;
}

int
mixer_busy(snd_mixer *m, int busy)
{
	m->busy = busy;
	return 0;
}

int
mixer_isbusy(snd_mixer *m)
{
	return m->busy;
}

int
mixer_init(device_t dev, kobj_class_t cls, void *devinfo)
{
    	snddev_info *d;
	snd_mixer *m;
	u_int16_t v;
	int i;

	d = device_get_softc(dev);
	m = (snd_mixer *)kobj_create(cls, M_MIXER, M_WAITOK | M_ZERO);

	m->name = cls->name;
	m->devinfo = devinfo;

	if (MIXER_INIT(m))
		goto bad;

	for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
		v = snd_mixerdefaults[i];
		mixer_set(m, i, v | (v << 8));
	}

	mixer_setrecsrc(m, SOUND_MASK_MIC);

	d->mixer = m;

	return 0;

bad:	kobj_delete((kobj_t)m, M_MIXER);
	return -1;
}

int
mixer_uninit(device_t dev)
{
	int i;
    	snddev_info *d;
	snd_mixer *m;

	d = device_get_softc(dev);
	m = d->mixer;

	for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
		mixer_set(m, i, 0);

	mixer_setrecsrc(m, SOUND_MASK_MIC);

	MIXER_UNINIT(m);

	kobj_delete((kobj_t)m, M_MIXER);
	d->mixer = NULL;

	return 0;
}

int
mixer_reinit(device_t dev)
{
	int i;
    	snddev_info *d;
	snd_mixer *m;

	d = device_get_softc(dev);
	m = d->mixer;

	i = MIXER_REINIT(m);
	if (i)
		return i;

	for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
		mixer_set(m, i, m->level[i]);

	mixer_setrecsrc(m, m->recsrc);

	return 0;
}

int
mixer_ioctl(snddev_info *d, u_long cmd, caddr_t arg)
{
	int ret, *arg_i = (int *)arg;
	int v = -1, j = cmd & 0xff;
	snd_mixer *m;

	m = d->mixer;

	if ((cmd & MIXER_WRITE(0)) == MIXER_WRITE(0)) {
		if (j == SOUND_MIXER_RECSRC)
			ret = mixer_setrecsrc(m, *arg_i);
		else
			ret = mixer_set(m, j, *arg_i);
		return (ret == 0)? 0 : ENXIO;
	}

    	if ((cmd & MIXER_READ(0)) == MIXER_READ(0)) {
		switch (j) {
    		case SOUND_MIXER_DEVMASK:
    		case SOUND_MIXER_CAPS:
    		case SOUND_MIXER_STEREODEVS:
			v = mix_getdevs(m);
			break;

    		case SOUND_MIXER_RECMASK:
			v = mix_getrecdevs(m);
			break;

    		case SOUND_MIXER_RECSRC:
			v = mixer_getrecsrc(m);
			break;

		default:
			v = mixer_get(m, j);
		}
		*arg_i = v;
		return (v != -1)? 0 : ENXIO;
	}
	return ENXIO;
}

#ifdef SND_DYNSYSCTL
static int
sysctl_hw_snd_hwvol_mixer(SYSCTL_HANDLER_ARGS)
{
	char devname[32];
	int error, dev;
	snd_mixer *m;

	m = oidp->oid_arg1;
	strncpy(devname, snd_mixernames[m->hwvol_mixer], sizeof(devname));
	error = sysctl_handle_string(oidp, &devname[0], sizeof(devname), req);
	if (error == 0 && req->newptr != NULL) {
		dev = mixer_lookup(devname);
		if (dev == -1)
			return EINVAL;
		else if (dev != m->hwvol_mixer) {
			m->hwvol_mixer = dev;
			m->hwvol_muted = 0;
		}
	}
	return error;
}
#endif

int
mixer_hwvol_init(device_t dev)
{
    	snddev_info *d;
	snd_mixer *m;

	d = device_get_softc(dev);
	m = d->mixer;
	m->hwvol_mixer = SOUND_MIXER_VOLUME;
	m->hwvol_step = 5;
#ifdef SND_DYNSYSCTL
	SYSCTL_ADD_INT(&d->sysctl_tree, SYSCTL_CHILDREN(d->sysctl_tree_top),
            OID_AUTO, "hwvol_step", CTLFLAG_RW, &m->hwvol_step, 0, "");
	SYSCTL_ADD_PROC(&d->sysctl_tree, SYSCTL_CHILDREN(d->sysctl_tree_top),
            OID_AUTO, "hwvol_mixer", CTLTYPE_STRING | CTLFLAG_RW, m, 0,
	    sysctl_hw_snd_hwvol_mixer, "A", "")
#endif
	return 0;
}

void
mixer_hwvol_mute(device_t dev)
{
    	snddev_info *d;
	snd_mixer *m;

	d = device_get_softc(dev);
	m = d->mixer;
	if (m->hwvol_muted) {
		m->hwvol_muted = 0;
		mixer_set(m, m->hwvol_mixer, m->hwvol_mute_level);
	} else {
		m->hwvol_muted++;
		m->hwvol_mute_level = mixer_get(m, m->hwvol_mixer);
		mixer_set(m, m->hwvol_mixer, 0);
	}
}

void
mixer_hwvol_step(device_t dev, int left_step, int right_step)
{
    	snddev_info *d;
	snd_mixer *m;
	int level, left, right;

	d = device_get_softc(dev);
	m = d->mixer;
	if (m->hwvol_muted) {
		m->hwvol_muted = 0;
		level = m->hwvol_mute_level;
	} else
		level = mixer_get(m, m->hwvol_mixer);
	if (level != -1) {
		left = level & 0xff;
		right = level >> 8;
		left += left_step * m->hwvol_step;
		if (left < 0)
			left = 0;
		right += right_step * m->hwvol_step;
		if (right < 0)
			right = 0;
		mixer_set(m, m->hwvol_mixer, left | right << 8);
	}
}

/*
 * The various mixers use a variety of bitmasks etc. The Voxware
 * driver had a very nice technique to describe a mixer and interface
 * to it. A table defines, for each channel, which register, bits,
 * offset, polarity to use. This procedure creates the new value
 * using the table and the old value.
 */

void
change_bits(mixer_tab *t, u_char *regval, int dev, int chn, int newval)
{
    	u_char mask;
    	int shift;

    	DEB(printf("ch_bits dev %d ch %d val %d old 0x%02x "
		"r %d p %d bit %d off %d\n",
		dev, chn, newval, *regval,
		(*t)[dev][chn].regno, (*t)[dev][chn].polarity,
		(*t)[dev][chn].nbits, (*t)[dev][chn].bitoffs ) );

    	if ( (*t)[dev][chn].polarity == 1)	/* reverse */
		newval = 100 - newval ;

    	mask = (1 << (*t)[dev][chn].nbits) - 1;
    	newval = (int) ((newval * mask) + 50) / 100; /* Scale it */
    	shift = (*t)[dev][chn].bitoffs /*- (*t)[dev][LEFT_CHN].nbits + 1*/;

    	*regval &= ~(mask << shift);        /* Filter out the previous value */
    	*regval |= (newval & mask) << shift;        /* Set the new value */
}