/*
   * OPL4 mixer functions
   * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   */
  
  #include "opl4_local.h"
  #include <sound/control.h>

  static int snd_opl4_ctl_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)

  {
  	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  	uinfo->count = 2;
  	uinfo->value.integer.min = 0;
  	uinfo->value.integer.max = 7;
  	return 0;
  }

  static int snd_opl4_ctl_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)

  {

  	struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);

  	unsigned long flags;
  	u8 reg = kcontrol->private_value;
  	u8 value;
  
  	spin_lock_irqsave(&opl4->reg_lock, flags);
  	value = snd_opl4_read(opl4, reg);
  	spin_unlock_irqrestore(&opl4->reg_lock, flags);
  	ucontrol->value.integer.value[0] = 7 - (value & 7);
  	ucontrol->value.integer.value[1] = 7 - ((value >> 3) & 7);
  	return 0;
  }

  static int snd_opl4_ctl_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)

  {

  	struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);

  	unsigned long flags;
  	u8 reg = kcontrol->private_value;
  	u8 value, old_value;
  
  	value = (7 - (ucontrol->value.integer.value[0] & 7)) |
  		((7 - (ucontrol->value.integer.value[1] & 7)) << 3);
  	spin_lock_irqsave(&opl4->reg_lock, flags);
  	old_value = snd_opl4_read(opl4, reg);
  	snd_opl4_write(opl4, reg, value);
  	spin_unlock_irqrestore(&opl4->reg_lock, flags);
  	return value != old_value;
  }

  static struct snd_kcontrol_new snd_opl4_controls[] = {

  	{
  		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  		.name = "FM Playback Volume",
  		.info = snd_opl4_ctl_info,
  		.get = snd_opl4_ctl_get,
  		.put = snd_opl4_ctl_put,
  		.private_value = OPL4_REG_MIX_CONTROL_FM
  	},
  	{
  		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  		.name = "Wavetable Playback Volume",
  		.info = snd_opl4_ctl_info,
  		.get = snd_opl4_ctl_get,
  		.put = snd_opl4_ctl_put,
  		.private_value = OPL4_REG_MIX_CONTROL_PCM
  	}
  };

  int snd_opl4_create_mixer(struct snd_opl4 *opl4)

  {

  	struct snd_card *card = opl4->card;

  	int i, err;
  
  	strcat(card->mixername, ",OPL4");
  
  	for (i = 0; i < 2; ++i) {
  		err = snd_ctl_add(card, snd_ctl_new1(&snd_opl4_controls[i], opl4));
  		if (err < 0)
  			return err;
  	}
  	return 0;
  }