From e6f1a2c153f17677b7dc27c79d0036cacacffdc5 Mon Sep 17 00:00:00 2001
From: Phani Kumar Uppalapati <phaniu@codeaurora.org>
Date: Thu, 1 Sep 2016 23:54:28 -0700
Subject: [PATCH] ASoC: wcd934x: Add API to enable standalone micbias

Add an API in wcd934x codec driver to enable
standalone micbias. This API can be used to enable
micbias even without an active audio capture session.

CRs-fixed: 1062152
Change-Id: I98074071546c053ce3be733602adeff23d6b4b72
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
---
 sound/soc/codecs/wcd934x/wcd934x.c | 52 ++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/sound/soc/codecs/wcd934x/wcd934x.c b/sound/soc/codecs/wcd934x/wcd934x.c
index 50a023013fa8..8323a09ccecc 100644
--- a/sound/soc/codecs/wcd934x/wcd934x.c
+++ b/sound/soc/codecs/wcd934x/wcd934x.c
@@ -3296,6 +3296,58 @@ static int __tavil_codec_enable_micbias(struct snd_soc_dapm_widget *w,
 	return 0;
 }
 
+/*
+ * tavil_codec_enable_standalone_micbias - enable micbias standalone
+ * @codec: pointer to codec instance
+ * @micb_num: number of micbias to be enabled
+ * @enable: true to enable micbias or false to disable
+ *
+ * This function is used to enable micbias (1, 2, 3 or 4) during
+ * standalone independent of whether TX use-case is running or not
+ *
+ * Return: error code in case of failure or 0 for success
+ */
+int tavil_codec_enable_standalone_micbias(struct snd_soc_codec *codec,
+					  int micb_num,
+					  bool enable)
+{
+	const char * const micb_names[] = {
+		DAPM_MICBIAS1_STANDALONE, DAPM_MICBIAS2_STANDALONE,
+		DAPM_MICBIAS3_STANDALONE, DAPM_MICBIAS4_STANDALONE
+	};
+	int micb_index = micb_num - 1;
+	int rc;
+
+	if (!codec) {
+		pr_err("%s: Codec memory is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	if ((micb_index < 0) || (micb_index > TAVIL_MAX_MICBIAS - 1)) {
+		dev_err(codec->dev, "%s: Invalid micbias index, micb_ind:%d\n",
+			__func__, micb_index);
+		return -EINVAL;
+	}
+
+	if (enable)
+		rc = snd_soc_dapm_force_enable_pin_unlocked(
+						snd_soc_codec_get_dapm(codec),
+						micb_names[micb_index]);
+	else
+		rc = snd_soc_dapm_disable_pin_unlocked(
+						snd_soc_codec_get_dapm(codec),
+						micb_names[micb_index]);
+
+	if (!rc)
+		snd_soc_dapm_sync(snd_soc_codec_get_dapm(codec));
+	else
+		dev_err(codec->dev, "%s: micbias%d force %s pin failed\n",
+			__func__, micb_num, (enable ? "enable" : "disable"));
+
+	return rc;
+}
+EXPORT_SYMBOL(tavil_codec_enable_standalone_micbias);
+
 static int tavil_codec_force_enable_micbias(struct snd_soc_dapm_widget *w,
 					    struct snd_kcontrol *kcontrol,
 					    int event)