Logo Search packages:      
Sourcecode: alsa-driver version File versions  Download package

ak4xxx.c

/*
 *   ALSA driver for ICEnsemble ICE1712 (Envy24)
 *
 *   AK4524 / AK4528 / AK4529 / AK4355 / AK4381 interface
 *
 *    Copyright (c) 2000 Jaroslav Kysela <perex@suse.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 <sound/driver.h>
#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@suse.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];

      snd_assert(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);

Generated by  Doxygen 1.6.0   Back to index