[alsa-devel] [PATCH] ASoC: omap: rx51: Enable McBSP2 sidetone

Jarkko Nikula jhnikula at gmail.com
Wed Mar 9 10:25:00 CET 2011

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 at gmail.com>
 sound/soc/omap/rx51.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/sound/soc/omap/rx51.c b/sound/soc/omap/rx51.c
index 055e447..d098622 100644
--- a/sound/soc/omap/rx51.c
+++ b/sound/soc/omap/rx51.c
@@ -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;
 	/* AV jack detection */

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