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ASoC: omap: rx51: Enable McBSP2 sidetone 

McBSP sidetone is needed in telephony applications. McBSP sidetone is a
configurable FIR filter that forms a loopback from McBSP input to output.
This patch enables the McBSP2 sidetone ALSA controls so that it can be used
on Nokia RX-51/N900.

Sidetone feature can be tested with following commands:

	(set up codec input and output paths)
	# Enable and configure sidetone
	amixer -D hw:0 set 'McBSP2 Sidetone' on
	amixer set -D hw:0 'McBSP2 Sidetone Channel 0' 32767
	echo 32767 >/sys/devices/platform/omap-mcbsp.2/st_taps
	# Do not loop audio via CPU
	arecord -f dat >/dev/null |aplay /dev/zero

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Jarkko Nikula 2011-03-09 11:25:00 +02:00 committed by Liam Girdwood
parent 9d7e584b3f
commit fa4d1f595a
1 changed files with 4 additions and 0 deletions
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4
sound/soc/omap/rx51.c
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@ -331,6 +331,10 @@ static int rx51_aic34_init(struct snd_soc_pcm_runtime *rtd)
return err;
snd_soc_limit_volume(codec, "TPA6130A2 Headphone Playback Volume", 42);
err = omap_mcbsp_st_add_controls(codec, 1);
if (err < 0)
return err;
snd_soc_dapm_sync(dapm);
/* AV jack detection */