/*
 * sound/ics2101.c
 *
 * Driver for the ICS2101 mixer of GUS v3.7.
 *
 * Copyright by Hannu Savolainen 1994
 *
 * 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.
 *
 */

#include "sound_config.h"
#if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_GUS)

#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_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)
{
#if 1
  /*
 *	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);
#else
  return ((vol * 127) + 50) / 100;
#endif
}

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;
    }

  DISABLE_INTR (flags);
  OUTB (ctrl_addr, u_MixSelect);
  OUTB (selector[dev], u_MixData);
  OUTB (attn_addr, u_MixSelect);
  OUTB ((unsigned char) vol, u_MixData);
  RESTORE_INTR (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, unsigned int arg)
{
  if (((cmd >> 8) & 0xff) == 'M')
    {
      if (cmd & IOC_IN)
	switch (cmd & 0xff)
	  {
	  case SOUND_MIXER_RECSRC:
	    return gus_default_mixer_ioctl (dev, cmd, arg);
	    break;

	  case SOUND_MIXER_MIC:
	    return IOCTL_OUT (arg, set_volumes (DEV_MIC, IOCTL_IN (arg)));
	    break;

	  case SOUND_MIXER_CD:
	    return IOCTL_OUT (arg, set_volumes (DEV_CD, IOCTL_IN (arg)));
	    break;

	  case SOUND_MIXER_LINE:
	    return IOCTL_OUT (arg, set_volumes (DEV_LINE, IOCTL_IN (arg)));
	    break;

	  case SOUND_MIXER_SYNTH:
	    return IOCTL_OUT (arg, set_volumes (DEV_GF1, IOCTL_IN (arg)));
	    break;

	  case SOUND_MIXER_VOLUME:
	    return IOCTL_OUT (arg, set_volumes (DEV_VOL, IOCTL_IN (arg)));
	    break;

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

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

	  case SOUND_MIXER_DEVMASK:
	    return IOCTL_OUT (arg, MIX_DEVS);
	    break;

	  case SOUND_MIXER_STEREODEVS:
	    return IOCTL_OUT (arg, SOUND_MASK_LINE | SOUND_MASK_CD |
			      SOUND_MASK_SYNTH | SOUND_MASK_VOLUME |
			      SOUND_MASK_MIC);
	    break;

	  case SOUND_MIXER_RECMASK:
	    return IOCTL_OUT (arg, SOUND_MASK_MIC | SOUND_MASK_LINE);
	    break;

	  case SOUND_MIXER_CAPS:
	    return IOCTL_OUT (arg, 0);
	    break;

	  case SOUND_MIXER_MIC:
	    return IOCTL_OUT (arg, volumes[DEV_MIC]);
	    break;

	  case SOUND_MIXER_LINE:
	    return IOCTL_OUT (arg, volumes[DEV_LINE]);
	    break;

	  case SOUND_MIXER_CD:
	    return IOCTL_OUT (arg, volumes[DEV_CD]);
	    break;

	  case SOUND_MIXER_VOLUME:
	    return IOCTL_OUT (arg, volumes[DEV_VOL]);
	    break;

	  case SOUND_MIXER_SYNTH:
	    return IOCTL_OUT (arg, volumes[DEV_GF1]);
	    break;

	  default:
	    return RET_ERROR (EINVAL);
	  }
    }

  return RET_ERROR (EINVAL);
}

static struct mixer_operations ics2101_mixer_operations =
{
  ics2101_mixer_ioctl
};

long
ics2101_mixer_init (long mem_start)
{
  int             i;

  if (num_mixers < MAX_MIXER_DEV)
    {
      mixer_devs[num_mixers++] = &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 mem_start;
}

#endif