iqaudio-bias.patch

diff --git a/sound/soc/bcm/iqaudio-dac.c b/sound/soc/bcm/iqaudio-dac.c
index b6b6dcf..b9a0c31 100644
--- a/sound/soc/bcm/iqaudio-dac.c
+++ b/sound/soc/bcm/iqaudio-dac.c
@@ -54,6 +54,38 @@ static int snd_rpi_iqaudio_dac_hw_params(struct snd_pcm_substream *substream,
 	return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
 }
 
+static int snd_rpi_iqaudio_set_bias_level(struct snd_soc_card *card,
+		struct snd_soc_dapm_context *dapm,
+		enum snd_soc_bias_level level)
+{
+	struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
+
+	if (dapm->dev != codec_dai->dev)
+		return 0;
+
+	switch (level) {
+	case SND_SOC_BIAS_PREPARE:
+		if (dapm->bias_level != SND_SOC_BIAS_STANDBY)
+			break;
+
+		/* TODO unmute etc. */
+		break;
+
+	case SND_SOC_BIAS_STANDBY:
+		if (dapm->bias_level != SND_SOC_BIAS_PREPARE)
+			break;
+
+		/* TODO mute etc. */
+		break;
+
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+
 /* machine stream operations */
 static struct snd_soc_ops snd_rpi_iqaudio_dac_ops = {
 	.hw_params = snd_rpi_iqaudio_dac_hw_params,
@@ -77,6 +109,7 @@ static struct snd_soc_card snd_rpi_iqaudio_dac = {
 	.owner        = THIS_MODULE,
 	.dai_link     = snd_rpi_iqaudio_dac_dai,
 	.num_links    = ARRAY_SIZE(snd_rpi_iqaudio_dac_dai),
+	.set_bias_level = snd_rpi_iqaudio_set_bias_level,
 };
 
 static int snd_rpi_iqaudio_dac_probe(struct platform_device *pdev)