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cs5535audio_olpc.c

/*
 * OLPC XO-1 additional sound features
 *
 * Copyright © 2006  Jaya Kumar <jayakumar.lkml@gmail.com>
 * Copyright © 2007-2008  Andres Salomon <dilinger@debian.org>
 *
 * 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.
 */
#include <sound/core.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/ac97_codec.h>

#include <asm/olpc.h>
#include "cs5535audio.h"

/*
 * OLPC has an additional feature on top of the regular AD1888 codec features.
 * It has an Analog Input mode that is switched into (after disabling the
 * High Pass Filter) via GPIO.  It is supported on B2 and later models.
 */
void olpc_analog_input(struct snd_ac97 *ac97, int on)
{
      int err;

      if (!machine_is_olpc())
            return;

      /* update the High Pass Filter (via AC97_AD_TEST2) */
      err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
                  1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);
      if (err < 0) {
            snd_printk(KERN_ERR "setting High Pass Filter - %d\n", err);
            return;
      }

      /* set Analog Input through GPIO */
      if (on)
            geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
      else
            geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
}

/*
 * OLPC XO-1's V_REFOUT is a mic bias enable.
 */
void olpc_mic_bias(struct snd_ac97 *ac97, int on)
{
      int err;

      if (!machine_is_olpc())
            return;

      on = on ? 0 : 1;
      err = snd_ac97_update_bits(ac97, AC97_AD_MISC,
                  1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT);
      if (err < 0)
            snd_printk(KERN_ERR "setting MIC Bias - %d\n", err);
}

static int olpc_dc_info(struct snd_kcontrol *kctl,
            struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 1;
      return 0;
}

static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
{
      v->value.integer.value[0] = geode_gpio_isset(OLPC_GPIO_MIC_AC,
                  GPIO_OUTPUT_VAL);
      return 0;
}

static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
{
      struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);

      olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]);
      return 1;
}

static int olpc_mic_info(struct snd_kcontrol *kctl,
            struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 1;
      return 0;
}

static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
{
      struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
      struct snd_ac97 *ac97 = cs5535au->ac97;
      int i;

      i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1;
      v->value.integer.value[0] = i ? 0 : 1;
      return 0;
}

static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
{
      struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);

      olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]);
      return 1;
}

static struct snd_kcontrol_new olpc_cs5535audio_ctls[] __devinitdata = {
{
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "DC Mode Enable",
      .info = olpc_dc_info,
      .get = olpc_dc_get,
      .put = olpc_dc_put,
      .private_value = 0,
},
{
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "MIC Bias Enable",
      .info = olpc_mic_info,
      .get = olpc_mic_get,
      .put = olpc_mic_put,
      .private_value = 0,
},
};

void __devinit olpc_prequirks(struct snd_card *card,
            struct snd_ac97_template *ac97)
{
      if (!machine_is_olpc())
            return;

      /* invert EAPD if on an OLPC B3 or higher */
      if (olpc_board_at_least(olpc_board_pre(0xb3)))
            ac97->scaps |= AC97_SCAP_INV_EAPD;
}

int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
{
      struct snd_ctl_elem_id elem;
      int i, err;

      if (!machine_is_olpc())
            return 0;

      /* drop the original AD1888 HPF control */
      memset(&elem, 0, sizeof(elem));
      elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
      strncpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
      snd_ctl_remove_id(card, &elem);

      /* drop the original V_REFOUT control */
      memset(&elem, 0, sizeof(elem));
      elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
      strncpy(elem.name, "V_REFOUT Enable", sizeof(elem.name));
      snd_ctl_remove_id(card, &elem);

      /* add the OLPC-specific controls */
      for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {
            err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],
                        ac97->private_data));
            if (err < 0)
                  return err;
      }

      /* turn off the mic by default */
      olpc_mic_bias(ac97, 0);
      return 0;
}

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