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

daca.c

/*
 * PMac DACA lowlevel functions
 *
 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
 *
 *   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/i2c.h>
#include <linux/kmod.h>
#include <linux/slab.h>
#include <sound/core.h>
#include "pmac.h"

/* i2c address */
#define DACA_I2C_ADDR   0x4d

/* registers */
#define DACA_REG_SR     0x01
#define DACA_REG_AVOL   0x02
#define DACA_REG_GCFG   0x03

/* maximum volume value */
#define DACA_VOL_MAX    0x38


struct pmac_daca {
      struct pmac_keywest i2c;
      int left_vol, right_vol;
      unsigned int deemphasis : 1;
      unsigned int amp_on : 1;
};


/*
 * initialize / detect DACA
 */
static int daca_init_client(struct pmac_keywest *i2c)
{
      unsigned short wdata = 0x00;
      /* SR: no swap, 1bit delay, 32-48kHz */
      /* GCFG: power amp inverted, DAC on */
      if (i2c_smbus_write_byte_data(i2c->client, DACA_REG_SR, 0x08) < 0 ||
          i2c_smbus_write_byte_data(i2c->client, DACA_REG_GCFG, 0x05) < 0)
            return -EINVAL;
      return i2c_smbus_write_block_data(i2c->client, DACA_REG_AVOL,
                                2, (unsigned char*)&wdata);
}

/*
 * update volume
 */
static int daca_set_volume(struct pmac_daca *mix)
{
      unsigned char data[2];
  
      if (! mix->i2c.client)
            return -ENODEV;
  
      if (mix->left_vol > DACA_VOL_MAX)
            data[0] = DACA_VOL_MAX;
      else
            data[0] = mix->left_vol;
      if (mix->right_vol > DACA_VOL_MAX)
            data[1] = DACA_VOL_MAX;
      else
            data[1] = mix->right_vol;
      data[1] |= mix->deemphasis ? 0x40 : 0;
      if (i2c_smbus_write_block_data(mix->i2c.client, DACA_REG_AVOL,
                               2, data) < 0) {
            snd_printk(KERN_ERR "failed to set volume \n");
            return -EINVAL;
      }
      return 0;
}


/* deemphasis switch */
#define daca_info_deemphasis        snd_ctl_boolean_mono_info

static int daca_get_deemphasis(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
      struct pmac_daca *mix;
      if (! (mix = chip->mixer_data))
            return -ENODEV;
      ucontrol->value.integer.value[0] = mix->deemphasis ? 1 : 0;
      return 0;
}

static int daca_put_deemphasis(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
      struct pmac_daca *mix;
      int change;

      if (! (mix = chip->mixer_data))
            return -ENODEV;
      change = mix->deemphasis != ucontrol->value.integer.value[0];
      if (change) {
            mix->deemphasis = !!ucontrol->value.integer.value[0];
            daca_set_volume(mix);
      }
      return change;
}

/* output volume */
static int daca_info_volume(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 2;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = DACA_VOL_MAX;
      return 0;
}

static int daca_get_volume(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
      struct pmac_daca *mix;
      if (! (mix = chip->mixer_data))
            return -ENODEV;
      ucontrol->value.integer.value[0] = mix->left_vol;
      ucontrol->value.integer.value[1] = mix->right_vol;
      return 0;
}

static int daca_put_volume(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
      struct pmac_daca *mix;
      unsigned int vol[2];
      int change;

      if (! (mix = chip->mixer_data))
            return -ENODEV;
      vol[0] = ucontrol->value.integer.value[0];
      vol[1] = ucontrol->value.integer.value[1];
      if (vol[0] > DACA_VOL_MAX || vol[1] > DACA_VOL_MAX)
            return -EINVAL;
      change = mix->left_vol != vol[0] ||
            mix->right_vol != vol[1];
      if (change) {
            mix->left_vol = vol[0];
            mix->right_vol = vol[1];
            daca_set_volume(mix);
      }
      return change;
}

/* amplifier switch */
#define daca_info_amp   daca_info_deemphasis

static int daca_get_amp(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
      struct pmac_daca *mix;
      if (! (mix = chip->mixer_data))
            return -ENODEV;
      ucontrol->value.integer.value[0] = mix->amp_on ? 1 : 0;
      return 0;
}

static int daca_put_amp(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
      struct pmac_daca *mix;
      int change;

      if (! (mix = chip->mixer_data))
            return -ENODEV;
      change = mix->amp_on != ucontrol->value.integer.value[0];
      if (change) {
            mix->amp_on = !!ucontrol->value.integer.value[0];
            i2c_smbus_write_byte_data(mix->i2c.client, DACA_REG_GCFG,
                                mix->amp_on ? 0x05 : 0x04);
      }
      return change;
}

static struct snd_kcontrol_new daca_mixers[] = {
      { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Deemphasis Switch",
        .info = daca_info_deemphasis,
        .get = daca_get_deemphasis,
        .put = daca_put_deemphasis
      },
      { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Master Playback Volume",
        .info = daca_info_volume,
        .get = daca_get_volume,
        .put = daca_put_volume
      },
      { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Power Amplifier Switch",
        .info = daca_info_amp,
        .get = daca_get_amp,
        .put = daca_put_amp
      },
};


#ifdef CONFIG_PM
static void daca_resume(struct snd_pmac *chip)
{
      struct pmac_daca *mix = chip->mixer_data;
      i2c_smbus_write_byte_data(mix->i2c.client, DACA_REG_SR, 0x08);
      i2c_smbus_write_byte_data(mix->i2c.client, DACA_REG_GCFG,
                          mix->amp_on ? 0x05 : 0x04);
      daca_set_volume(mix);
}
#endif /* CONFIG_PM */


static void daca_cleanup(struct snd_pmac *chip)
{
      struct pmac_daca *mix = chip->mixer_data;
      if (! mix)
            return;
      snd_pmac_keywest_cleanup(&mix->i2c);
      kfree(mix);
      chip->mixer_data = NULL;
}

/* exported */
int __devinit snd_pmac_daca_init(struct snd_pmac *chip)
{
      int i, err;
      struct pmac_daca *mix;

      request_module("i2c-powermac");

      mix = kzalloc(sizeof(*mix), GFP_KERNEL);
      if (! mix)
            return -ENOMEM;
      chip->mixer_data = mix;
      chip->mixer_free = daca_cleanup;
      mix->amp_on = 1; /* default on */

      mix->i2c.addr = DACA_I2C_ADDR;
      mix->i2c.init_client = daca_init_client;
      mix->i2c.name = "DACA";
      if ((err = snd_pmac_keywest_init(&mix->i2c)) < 0)
            return err;

      /*
       * build mixers
       */
      strcpy(chip->card->mixername, "PowerMac DACA");

      for (i = 0; i < ARRAY_SIZE(daca_mixers); i++) {
            if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&daca_mixers[i], chip))) < 0)
                  return err;
      }

#ifdef CONFIG_PM
      chip->resume = daca_resume;
#endif

      return 0;
}

Generated by  Doxygen 1.6.0   Back to index