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>

diff --git a/sound/soc/omap/rx51.c b/sound/soc/omap/rx51.c
index 055e447..d098622 100644 (file)
--- 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 */