ASoC: omap: rx51: Add FM transmitter support

Si4713 FM transmitter on Nokia RX-51/N900 is connected to same Line out
signals of TLV320AIC34 than TPA6130 headphone amplifier.

This patch adds route to transmitter and "FM Transmitter" control to keep
route active when needed.

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

sound/soc/omap/rx51.c

@@ -251,6 +251,7 @@ static const struct snd_soc_dapm_widget aic34_dapm_widgets[] = {
 	SND_SOC_DAPM_MIC("DMic", NULL),
 	SND_SOC_DAPM_HP("Headphone Jack", rx51_hp_event),
 	SND_SOC_DAPM_MIC("HS Mic", NULL),
+	SND_SOC_DAPM_LINE("FM Transmitter", NULL),
 };
 
 static const struct snd_soc_dapm_widget aic34_dapm_widgetsb[] = {
@@ -262,6 +263,8 @@ static const struct snd_soc_dapm_route audio_map[] = {
 	{"Ext Spk", NULL, "HPROUT"},
 	{"Headphone Jack", NULL, "LLOUT"},
 	{"Headphone Jack", NULL, "RLOUT"},
+	{"FM Transmitter", NULL, "LLOUT"},
+	{"FM Transmitter", NULL, "RLOUT"},
 
 	{"DMic Rate 64", NULL, "Mic Bias 2V"},
 	{"Mic Bias 2V", NULL, "DMic"},
@@ -292,6 +295,7 @@ static const struct snd_kcontrol_new aic34_rx51_controls[] = {
 		     rx51_get_input, rx51_set_input),
 	SOC_ENUM_EXT("Jack Function", rx51_enum[2],
 		     rx51_get_jack, rx51_set_jack),
+	SOC_DAPM_PIN_SWITCH("FM Transmitter"),
 };
 
 static const struct snd_kcontrol_new aic34_rx51_controlsb[] = {