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Commit e463ae1d authored by Chris Ball's avatar Chris Ball Committed by Takashi Iwai
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ALSA: cs5535audio: enable OLPC's V_REFOUT bias when recording 



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: default avatarChris Ball <cjb@laptop.org>
Signed-off-by: default avatarAndres Salomon <dilinger@debian.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 189d34e7

sound/pci/cs5535audio/cs5535audio_pcm.c

+16 −0
Original line number Diff line number Diff line
@@ -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;

}