ak4xxx.c
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/*
* ALSA driver for ICEnsemble ICE1712 (Envy24)
*
* AK4524 / AK4528 / AK4529 / AK4355 / AK4381 interface
*
* Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
*
* 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/interrupt.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/initval.h>
#include "ice1712.h"
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("ICEnsemble ICE17xx <-> AK4xxx AD/DA chip interface");
MODULE_LICENSE("GPL");
static void snd_ice1712_akm4xxx_lock(struct snd_akm4xxx *ak, int chip)
{
struct snd_ice1712 *ice = ak->private_data[0];
snd_ice1712_save_gpio_status(ice);
}
static void snd_ice1712_akm4xxx_unlock(struct snd_akm4xxx *ak, int chip)
{
struct snd_ice1712 *ice = ak->private_data[0];
snd_ice1712_restore_gpio_status(ice);
}
/*
* write AK4xxx register
*/
static void snd_ice1712_akm4xxx_write(struct snd_akm4xxx *ak, int chip,
unsigned char addr, unsigned char data)
{
unsigned int tmp;
int idx;
unsigned int addrdata;
struct snd_ak4xxx_private *priv = (void *)ak->private_value[0];
struct snd_ice1712 *ice = ak->private_data[0];
if (snd_BUG_ON(chip < 0 || chip >= 4))
return;
tmp = snd_ice1712_gpio_read(ice);
tmp |= priv->add_flags;
tmp &= ~priv->mask_flags;
if (priv->cs_mask == priv->cs_addr) {
if (priv->cif) {
tmp |= priv->cs_mask; /* start without chip select */
} else {
tmp &= ~priv->cs_mask; /* chip select low */
snd_ice1712_gpio_write(ice, tmp);
udelay(1);
}
} else {
/* doesn't handle cf=1 yet */
tmp &= ~priv->cs_mask;
tmp |= priv->cs_addr;
snd_ice1712_gpio_write(ice, tmp);
udelay(1);
}
/* build I2C address + data byte */
addrdata = (priv->caddr << 6) | 0x20 | (addr & 0x1f);
addrdata = (addrdata << 8) | data;
for (idx = 15; idx >= 0; idx--) {
/* drop clock */
tmp &= ~priv->clk_mask;
snd_ice1712_gpio_write(ice, tmp);
udelay(1);
/* set data */
if (addrdata & (1 << idx))
tmp |= priv->data_mask;
else
tmp &= ~priv->data_mask;
snd_ice1712_gpio_write(ice, tmp);
udelay(1);
/* raise clock */
tmp |= priv->clk_mask;
snd_ice1712_gpio_write(ice, tmp);
udelay(1);
}
if (priv->cs_mask == priv->cs_addr) {
if (priv->cif) {
/* assert a cs pulse to trigger */
tmp &= ~priv->cs_mask;
snd_ice1712_gpio_write(ice, tmp);
udelay(1);
}
tmp |= priv->cs_mask; /* chip select high to trigger */
} else {
tmp &= ~priv->cs_mask;
tmp |= priv->cs_none; /* deselect address */
}
snd_ice1712_gpio_write(ice, tmp);
udelay(1);
}
/*
* initialize the struct snd_akm4xxx record with the template
*/
int snd_ice1712_akm4xxx_init(struct snd_akm4xxx *ak, const struct snd_akm4xxx *temp,
const struct snd_ak4xxx_private *_priv, struct snd_ice1712 *ice)
{
struct snd_ak4xxx_private *priv;
if (_priv != NULL) {
priv = kmalloc(sizeof(*priv), GFP_KERNEL);
if (priv == NULL)
return -ENOMEM;
*priv = *_priv;
} else {
priv = NULL;
}
*ak = *temp;
ak->card = ice->card;
ak->private_value[0] = (unsigned long)priv;
ak->private_data[0] = ice;
if (ak->ops.lock == NULL)
ak->ops.lock = snd_ice1712_akm4xxx_lock;
if (ak->ops.unlock == NULL)
ak->ops.unlock = snd_ice1712_akm4xxx_unlock;
if (ak->ops.write == NULL)
ak->ops.write = snd_ice1712_akm4xxx_write;
snd_akm4xxx_init(ak);
return 0;
}
void snd_ice1712_akm4xxx_free(struct snd_ice1712 *ice)
{
unsigned int akidx;
if (ice->akm == NULL)
return;
for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
struct snd_akm4xxx *ak = &ice->akm[akidx];
kfree((void*)ak->private_value[0]);
}
kfree(ice->akm);
}
/*
* build AK4xxx controls
*/
int snd_ice1712_akm4xxx_build_controls(struct snd_ice1712 *ice)
{
unsigned int akidx;
int err;
for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
struct snd_akm4xxx *ak = &ice->akm[akidx];
err = snd_akm4xxx_build_controls(ak);
if (err < 0)
return err;
}
return 0;
}
static int __init alsa_ice1712_akm4xxx_module_init(void)
{
return 0;
}
static void __exit alsa_ice1712_akm4xxx_module_exit(void)
{
}
module_init(alsa_ice1712_akm4xxx_module_init)
module_exit(alsa_ice1712_akm4xxx_module_exit)
EXPORT_SYMBOL(snd_ice1712_akm4xxx_init);
EXPORT_SYMBOL(snd_ice1712_akm4xxx_free);
EXPORT_SYMBOL(snd_ice1712_akm4xxx_build_controls);