ALSA: cs5535audio: enable OLPC's V_REFOUT bias when recording
Subsystems (2)
PATCH 9/14 ALSA: cs5535audio: enable OLPC's V_REFOUT bias when recording
From: Chris Ball <[email protected]>
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 <[email protected]>
Signed-off-by Andres Salomon <[email protected]>
--- sound/pci/cs5535audio/cs5535audio_pcm.c | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-)
sound/pci/cs5535audio/cs5535audio_pcm.c +16 -0
@@ -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 ; }
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