path: root/sound/isa/sb/sb_mixer.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Routines for Sound Blaster mixer control
 *
 *
 *   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 <asm/io.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/sb.h>
#include <sound/control.h>

#undef IO_DEBUG

void snd_sbmixer_write(struct snd_sb *chip, unsigned char reg, unsigned char data)
{
	outb(reg, SBP(chip, MIXER_ADDR));
	udelay(10);
	outb(data, SBP(chip, MIXER_DATA));
	udelay(10);
#ifdef IO_DEBUG
	snd_printk(KERN_DEBUG "mixer_write 0x%x 0x%x\n", reg, data);
#endif
}

unsigned char snd_sbmixer_read(struct snd_sb *chip, unsigned char reg)
{
	unsigned char result;

	outb(reg, SBP(chip, MIXER_ADDR));
	udelay(10);
	result = inb(SBP(chip, MIXER_DATA));
	udelay(10);
#ifdef IO_DEBUG
	snd_printk(KERN_DEBUG "mixer_read 0x%x 0x%x\n", reg, result);
#endif
	return result;
}

/*
 * Single channel mixer element
 */

static int snd_sbmixer_info_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
	int mask = (kcontrol->private_value >> 24) & 0xff;

	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = mask;
	return 0;
}

static int snd_sbmixer_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_sb *sb = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 16) & 0xff;
	int mask = (kcontrol->private_value >> 24) & 0xff;
	unsigned char val;

	spin_lock_irqsave(&sb->mixer_lock, flags);
	val = (snd_sbmixer_read(sb, reg) >> shift) & mask;
	spin_unlock_irqrestore(&sb->mixer_lock, flags);
	ucontrol->value.integer.value[0] = val;
	return 0;
}

static int snd_sbmixer_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_sb *sb = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 16) & 0x07;
	int mask = (kcontrol->private_value >> 24) & 0xff;
	int change;
	unsigned char val, oval;

	val = (ucontrol->value.integer.value[0] & mask) << shift;
	spin_lock_irqsave(&sb->mixer_lock, flags);
	oval = snd_sbmixer_read(sb, reg);
	val = (oval & ~(mask << shift)) | val;
	change = val != oval;
	if (change)
		snd_sbmixer_write(sb, reg, val);
	spin_unlock_irqrestore(&sb->mixer_lock, flags);
	return change;
}

/*
 * Double channel mixer element
 */

static int snd_sbmixer_info_do