path: root/sound/isa/es1688/es1688_lib.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Routines for control of ESS ES1688/688/488 chip
 *
 *
 *   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 <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <sound/core.h>
#include <sound/es1688.h>
#include <sound/initval.h>

#include <asm/io.h>
#include <asm/dma.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("ESS ESx688 lowlevel module");
MODULE_LICENSE("GPL");

static int snd_es1688_dsp_command(struct snd_es1688 *chip, unsigned char val)
{
	int i;

	for (i = 10000; i; i--)
		if ((inb(ES1688P(chip, STATUS)) & 0x80) == 0) {
			outb(val, ES1688P(chip, COMMAND));
			return 1;
		}
#ifdef CONFIG_SND_DEBUG
	printk(KERN_DEBUG "snd_es1688_dsp_command: timeout (0x%x)\n", val);
#endif
	return 0;
}

static int snd_es1688_dsp_get_byte(struct snd_es1688 *chip)
{
	int i;

	for (i = 1000; i; i--)
		if (inb(ES1688P(chip, DATA_AVAIL)) & 0x80)
			return inb(ES1688P(chip, READ));
	snd_printd("es1688 get byte failed: 0x%lx = 0x%x!!!\n", ES1688P(chip, DATA_AVAIL), inb(ES1688P(chip, DATA_AVAIL)));
	return -ENODEV;
}

static int snd_es1688_write(struct snd_es1688 *chip,
			    unsigned char reg, unsigned char data)
{
	if (!snd_es1688_dsp_command(chip, reg))
		return 0;
	return snd_es1688_dsp_command(chip, data);
}

static int snd_es1688_read(struct snd_es1688 *chip, unsigned char reg)
{
	/* Read a byte from an extended mode register of ES1688 */
	if (!snd_es1688_dsp_command(chip, 0xc0))
		return -1;
	if (!snd_es1688_dsp_command(chip, reg))
		return -1;
	return snd_es1688_dsp_get_byte(chip);
}

void snd_es1688_mixer_write(struct snd_es1688 *chip,
			    unsigned char reg, unsigned char data)
{
	outb(reg, ES1688P(chip, MIXER_ADDR));
	udelay(10);
	outb(data, ES1688P(chip, MIXER_DATA));
	udelay(10);
}

static unsigned char snd_es1688_mixer_read(struct snd_es1688 *chip, unsigned char reg)
{
	unsigned char result;

	outb(reg, ES1688P(chip, MIXER_ADDR));
	udelay(10);
	result = inb(ES1688P(chip, MIXER_DATA));
	udelay(10);
	return result;
}

int snd_es1688_reset(struct snd_es1688 *chip)
{
	int i;

	outb(3, ES1688P(chip, RESET));		/* valid only for ESS chips, SB -> 1 */
	udelay(10);
	outb(0, ES1688P(chip, RESET));
	udelay(30);
	for (i = 0; i < 1000 && !(inb(ES1688P(chip, DATA_AVAIL)) & 0x80); i++);
	if (inb(ES1688P(chip, READ)) != 0xaa) {
		snd_printd("ess_reset at 0x%lx: failed!!!\n", chip->port);
		return -ENODEV;
	}
	snd_es1688_dsp_command(chip, 0xc6);	/* enable extended mode */
	return 0;
}
EXPORT_SYMBOL(snd_es1688_reset);

static int snd_es1688_probe(struct snd_es1688 *chip)
{
	unsigned long flags;
	unsigned short major, minor, hw;
	int i;

	/*
	 *  initialization sequence
	 */

	spin_lock_irqsave(&chip->reg_lock, flags);	/* Some ESS1688 cards need this */
	inb(ES1688P(chip, ENABLE1));	/* ENABLE1 */
	inb(ES1688P(chip, ENABLE1));	/* ENABLE1 */