ak4xxx.c

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/*
 *   ALSA driver for ICEnsemble ICE1712 (Envy24)
 *
 *   AK4524 / AK4528 / AK4529 / AK4355 / AK4381 interface
 *
 *  Copyright (c) 2000 Jaroslav Kysela <[email protected]>
 *
 *   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 <[email protected]>");
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);