/*
 *   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/init.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);