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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/sound/drivers/opl4/opl4_mixer.c
10817 views
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/*

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 * OPL4 mixer functions

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 * Copyright (c) 2003 by Clemens Ladisch <[email protected]>

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License as published by

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 * the Free Software Foundation; either version 2 of the License, or

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 * (at your option) any later version.

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 *

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 * This program is distributed in the hope that it will be useful,

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 * but WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 * GNU General Public License for more details.

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 *

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 * You should have received a copy of the GNU General Public License

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 * along with this program; if not, write to the Free Software

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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

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 */

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#include "opl4_local.h"

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#include <sound/control.h>

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

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{

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	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;

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	uinfo->count = 2;

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	uinfo->value.integer.min = 0;

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	uinfo->value.integer.max = 7;

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	return 0;

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}

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

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{

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	struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);

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	unsigned long flags;

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	u8 reg = kcontrol->private_value;

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	u8 value;

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	spin_lock_irqsave(&opl4->reg_lock, flags);

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	value = snd_opl4_read(opl4, reg);

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	spin_unlock_irqrestore(&opl4->reg_lock, flags);

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	ucontrol->value.integer.value[0] = 7 - (value & 7);

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	ucontrol->value.integer.value[1] = 7 - ((value >> 3) & 7);

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	return 0;

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}

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

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{

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	struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);

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	unsigned long flags;

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	u8 reg = kcontrol->private_value;

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	u8 value, old_value;

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	value = (7 - (ucontrol->value.integer.value[0] & 7)) |

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		((7 - (ucontrol->value.integer.value[1] & 7)) << 3);

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	spin_lock_irqsave(&opl4->reg_lock, flags);

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	old_value = snd_opl4_read(opl4, reg);

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	snd_opl4_write(opl4, reg, value);

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	spin_unlock_irqrestore(&opl4->reg_lock, flags);

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	return value != old_value;

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}

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static struct snd_kcontrol_new snd_opl4_controls[] = {

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	{

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		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,

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		.name = "FM Playback Volume",

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		.info = snd_opl4_ctl_info,

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		.get = snd_opl4_ctl_get,

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		.put = snd_opl4_ctl_put,

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		.private_value = OPL4_REG_MIX_CONTROL_FM

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	},

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	{

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		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,

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		.name = "Wavetable Playback Volume",

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		.info = snd_opl4_ctl_info,

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		.get = snd_opl4_ctl_get,

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		.put = snd_opl4_ctl_put,

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		.private_value = OPL4_REG_MIX_CONTROL_PCM

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	}

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};

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int snd_opl4_create_mixer(struct snd_opl4 *opl4)

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{

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	struct snd_card *card = opl4->card;

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	int i, err;

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	strcat(card->mixername, ",OPL4");

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	for (i = 0; i < 2; ++i) {

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		err = snd_ctl_add(card, snd_ctl_new1(&snd_opl4_controls[i], opl4));

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		if (err < 0)

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			return err;

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	}

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	return 0;

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}

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