/*
 * sound/ics2101.c
 *
 * Driver for the ICS2101 mixer of GUS v3.7.
 */
/*
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 */
#include <linux/config.h>


#include "sound_config.h"
#if defined(CONFIG_GUSHW) || defined(MODULE)

#include <linux/ultrasound.h>
#include "gus_hw.h"

#define MIX_DEVS	(SOUND_MASK_MIC|SOUND_MASK_LINE| \
			 SOUND_MASK_SYNTH| \
  			 SOUND_MASK_CD | SOUND_MASK_VOLUME)

extern int     *gus_osp;
extern int      gus_base;
static int      volumes[ICS_MIXDEVS];
static int      left_fix[ICS_MIXDEVS] =
{1, 1, 1, 2, 1, 2};
static int      right_fix[ICS_MIXDEVS] =
{2, 2, 2, 1, 2, 1};

static int scale_vol(int vol)
{
	/*
	 *  Experimental volume scaling by Risto Kankkunen.
	 *  This should give smoother volume response than just
	 *  a plain multiplication.
	 */
	 
	int e;

	if (vol < 0)
		vol = 0;
	if (vol > 100)
		vol = 100;
	vol = (31 * vol + 50) / 100;
	e = 0;
	if (vol)
	{
		while (vol < 16)
		{
			vol <<= 1;
			e--;
		}
		vol -= 16;
		e += 7;
	}
	return ((e << 4) + vol);
}

static void write_mix(int dev, int chn, int vol)
{
	int *selector;
	unsigned long flags;
	int ctrl_addr = dev << 3;
	int attn_addr = dev << 3;

	vol = scale_vol(vol);

	if (chn == CHN_LEFT)
	{
		selector = left_fix;
		ctrl_addr |= 0x00;
		attn_addr |= 0x02;
	}
	else
	{
		selector = right_fix;
		ctrl_addr |= 0x01;
		attn_addr |= 0x03;
	}

	save_flags(flags);
	cli();
	outb((ctrl_addr), u_MixSelect);
	outb((selector[dev]), u_MixData);
	outb((attn_addr), u_MixSelect);
	outb(((unsigned char) vol), u_MixData);
	restore_flags(flags);
}

static int set_volumes(int dev, int vol)
{
	int left = vol & 0x00ff;
	int right = (vol >> 8) & 0x00ff;

	if (left < 0)
		left = 0;
	if (left > 100)
		left = 100;
	if (right < 0)
		right = 0;
	if (right > 100)
		right = 100;

	write_mix(dev, CHN_LEFT, left);
	write_mix(dev, CHN_RIGHT, right);

	vol = left + (right << 8);
	volumes[dev] = vol;
	return vol;
}

static int ics2101_mixer_ioctl(int dev, unsigned int cmd, caddr_t arg)
{
	if (((cmd >> 8) & 0xff) == 'M')
	{
		if (_SIOC_DIR(cmd) & _SIOC_WRITE)
		{
			int val;

			val = *(int *) arg;

			switch (cmd & 0xff)
			{
				case SOUND_MIXER_RECSRC:
					return gus_default_mixer_ioctl(dev, cmd, arg);

				case SOUND_MIXER_MIC:
					return (*(int *) arg = set_volumes(DEV_MIC, val));

				case SOUND_MIXER_CD:
					return (*(int *) arg = set_volumes(DEV_CD, val));

				case SOUND_MIXER_LINE:
					return (*(int *) arg = set_volumes(DEV_LINE, val));

				case SOUND_MIXER_SYNTH:
					return (*(int *) arg = set_volumes(DEV_GF1, val));

				case SOUND_MIXER_VOLUME:
					return (*(int *) arg = set_volumes(DEV_VOL, val));

				default:
					return -EINVAL;
			}
		}
		else
		{
			switch (cmd & 0xff)	/*
						 * Return parameters
						 */
			{

				case SOUND_MIXER_RECSRC:
					return gus_default_mixer_ioctl(dev, cmd, arg);

				case SOUND_MIXER_DEVMASK:
					return (*(int *) arg = MIX_DEVS);

				case SOUND_MIXER_STEREODEVS:
					return (*(int *) arg = SOUND_MASK_LINE | SOUND_MASK_CD | SOUND_MASK_SYNTH | SOUND_MASK_VOLUME | SOUND_MASK_MIC);

				case SOUND_MIXER_RECMASK:
					return (*(int *) arg = SOUND_MASK_MIC | SOUND_MASK_LINE);

				case SOUND_MIXER_CAPS:
				    return (*(int *) arg = 0);
				    break;

				case SOUND_MIXER_MIC:
					return (*(int *) arg = volumes[DEV_MIC]);

				case SOUND_MIXER_LINE:
					return (*(int *) arg = volumes[DEV_LINE]);

				case SOUND_MIXER_CD:
					return (*(int *) arg = volumes[DEV_CD]);

				case SOUND_MIXER_VOLUME:
					return (*(int *) arg = volumes[DEV_VOL]);

				case SOUND_MIXER_SYNTH:
					return (*(int *) arg = volumes[DEV_GF1]);

				default:
					return -EINVAL;
			}
		}
	}
	return -EINVAL;
}

static struct mixer_operations ics2101_mixer_operations =
{
	"ICS2101",
	"ICS2101 Multimedia Mixer",
	ics2101_mixer_ioctl
};

int
ics2101_mixer_init(void)
{
	int i;
	int n;

	if ((n = sound_alloc_mixerdev()) != -1)
	{
		n = num_mixers;
		mixer_devs[n] = &ics2101_mixer_operations;

		/*
		 * Some GUS v3.7 cards had some channels flipped. Disable
		 * the flipping feature if the model id is other than 5.
		 */

		if (inb(u_MixSelect) != 5)
		{
			for (i = 0; i < ICS_MIXDEVS; i++)
				left_fix[i] = 1;
			for (i = 0; i < ICS_MIXDEVS; i++)
				right_fix[i] = 2;
		}
		set_volumes(DEV_GF1, 0x5a5a);
		set_volumes(DEV_CD, 0x5a5a);
		set_volumes(DEV_MIC, 0x0000);
		set_volumes(DEV_LINE, 0x5a5a);
		set_volumes(DEV_VOL, 0x5a5a);
		set_volumes(DEV_UNUSED, 0x0000);
	}
	return n;
}

#endif