[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;
+
snd_soc_dapm_sync(dapm);
/* AV jack detection */
--
1.7.2.3
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