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/*

 * sound/ics2101.c

 *

 * Driver for the ICS2101 mixer of GUS v3.7.

 */

/*

 * Copyright (C) by Hannu Savolainen 1993-1996

 *

 * USS/Lite 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_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_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 (_IOC_DIR (cmd) & _IOC_WRITE)

        switch (cmd & 0xff)

          {

          case SOUND_MIXER_RECSRC:

            return gus_default_mixer_ioctl (dev, cmd, arg);

            break;

          case SOUND_MIXER_MIC:

            return snd_ioctl_return ((int *) arg, set_volumes (DEV_MIC, get_user ((int *) arg)));

            break;

          case SOUND_MIXER_CD:

            return snd_ioctl_return ((int *) arg, set_volumes (DEV_CD, get_user ((int *) arg)));

            break;

          case SOUND_MIXER_LINE:

            return snd_ioctl_return ((int *) arg, set_volumes (DEV_LINE, get_user ((int *) arg)));

            break;

          case SOUND_MIXER_SYNTH:

            return snd_ioctl_return ((int *) arg, set_volumes (DEV_GF1, get_user ((int *) arg)));

            break;

          case SOUND_MIXER_VOLUME:

            return snd_ioctl_return ((int *) arg, set_volumes (DEV_VOL, get_user ((int *) arg)));

            break;

          default:

            return -(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 snd_ioctl_return ((int *) arg, MIX_DEVS);

            break;

          case SOUND_MIXER_STEREODEVS:

            return snd_ioctl_return ((int *) arg, SOUND_MASK_LINE | SOUND_MASK_CD | SOUND_MASK_SYNTH | SOUND_MASK_VOLUME | SOUND_MASK_MIC);

            break;

          case SOUND_MIXER_RECMASK:

            return snd_ioctl_return ((int *) arg, SOUND_MASK_MIC | SOUND_MASK_LINE);

            break;

          case SOUND_MIXER_CAPS:

            return snd_ioctl_return ((int *) arg, 0);

            break;

          case SOUND_MIXER_MIC:

            return snd_ioctl_return ((int *) arg, volumes[DEV_MIC]);

            break;

          case SOUND_MIXER_LINE:

            return snd_ioctl_return ((int *) arg, volumes[DEV_LINE]);

            break;

          case SOUND_MIXER_CD:

            return snd_ioctl_return ((int *) arg, volumes[DEV_CD]);

            break;

          case SOUND_MIXER_VOLUME:

            return snd_ioctl_return ((int *) arg, volumes[DEV_VOL]);

            break;

          case SOUND_MIXER_SYNTH:

            return snd_ioctl_return ((int *) arg, volumes[DEV_GF1]);

            break;

          default:

            return -(EINVAL);

          }

    }

  return -(EINVAL);

}

static struct mixer_operations ics2101_mixer_operations =

{

  "ICS2101",

  "ICS2101 Multimedia Mixer",

  ics2101_mixer_ioctl

};

void

ics2101_mixer_init (void)

{

  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);

    }

}

#endif