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ALSA: cs5535audio: enable OLPC's V_REFOUT bias when recording

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The OLPC has a privacy light hooked up in series with the microphone's
V_Ref bias.  We want to activate the bias while we are capturing audio.

Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Andres Salomon <dilinger@debian.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Chris Ball 2008-11-06 16:50:09 -05:00 committed by Takashi Iwai
parent 189d34e747
commit e463ae1d13
1 changed files with 16 additions and 0 deletions
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16
sound/pci/cs5535audio/cs5535audio_pcm.c
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@ -363,11 +363,27 @@ static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
if ((err = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
return err;
#ifdef CONFIG_OLPC
/* Enable the V_ref bias only while recording. */
err = snd_ac97_update_bits(cs5535au->ac97, AC97_AD_MISC,
1 << AC97_AD_VREFD_SHIFT, 0);
if (err < 0)
snd_printk(KERN_ERR "Error updating AD_MISC %d\n", err);
#endif
return 0;
}
static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
{
int err;
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
#ifdef CONFIG_OLPC
/* Disable V_ref bias. */
err = snd_ac97_update_bits(cs5535au->ac97, AC97_AD_MISC,
1 << AC97_AD_VREFD_SHIFT, 1 << AC97_AD_VREFD_SHIFT);
#endif
return 0;
}