ASoC: DMIC codec - Add input widget

Digital microphones can have some additional elements in their
audio path (like microphone bias). An input widget is required
for digital microphone CODEC driver to allow external connections
in machine drivers.
Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>
Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/dmic.c

@@ -39,7 +39,31 @@ static struct snd_soc_dai_driver dmic_dai = {
 	},
 };
 
-static struct snd_soc_codec_driver soc_dmic = {};
+static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
+	SND_SOC_DAPM_AIF_OUT("DMIC AIF", "Capture", 0,
+			     SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_INPUT("DMic"),
+};
+
+static const struct snd_soc_dapm_route intercon[] = {
+	{"DMIC AIF", NULL, "DMic"},
+};
+
+static int dmic_probe(struct snd_soc_codec *codec)
+{
+	struct snd_soc_dapm_context *dapm = &codec->dapm;
+
+	snd_soc_dapm_new_controls(dapm, dmic_dapm_widgets,
+				  ARRAY_SIZE(dmic_dapm_widgets));
+        snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
+	snd_soc_dapm_new_widgets(dapm);
+
+	return 0;
+}
+
+static struct snd_soc_codec_driver soc_dmic = {
+	.probe	= dmic_probe,
+};
 
 static int __devinit dmic_dev_probe(struct platform_device *pdev)
 {