ASoC: wcd938x: add support to retrieve codec variant

Machine driver requires a mechanism to know the codec variant
to limit supported configurations respective to that codec.
Add a function to return the wcd938x codec variant.

CRs-Fixed: 2488322
Change-Id: I16631cccb3abd32c933389e110e5b5a6b762a0e2
Signed-off-by: Vignesh Kulothungan <[email protected]>

asoc/codecs/wcd938x/wcd938x.c

@@ -23,6 +23,7 @@
 
 #include "internal.h"
 #include "wcd938x-registers.h"
+#include "wcd938x.h"
 
 #define WCD938X_DRV_NAME "wcd938x_codec"
 #define NUM_SWRS_DT_PARAMS 5
@@ -39,11 +40,6 @@
 #define ADC_MODE_VAL_ULP1     0x09
 #define ADC_MODE_VAL_ULP2     0x0B
 
-enum {
-	WCD9380 = 0,
-	WCD9385 = 5,
-};
-
 enum {
 	CODEC_TX = 0,
 	CODEC_RX,
@@ -2680,6 +2676,30 @@ static struct snd_info_entry_ops wcd938x_variant_ops = {
 	.read = wcd938x_variant_read,
 };
 
+/*
+ * wcd938x_get_codec_variant
+ * @component: component instance
+ *
+ * Return: codec variant or -EINVAL in error.
+ */
+int wcd938x_get_codec_variant(struct snd_soc_component *component)
+{
+	struct wcd938x_priv *priv = NULL;
+
+	if (!component)
+		return -EINVAL;
+
+	priv = snd_soc_component_get_drvdata(component);
+	if (!priv) {
+		dev_err(component->dev,
+			"%s:wcd938x not probed\n", __func__);
+		return 0;
+	}
+
+	return priv->variant;
+}
+EXPORT_SYMBOL(wcd938x_get_codec_variant);
+
 /*
  * wcd938x_info_create_codec_entry - creates wcd938x module
  * @codec_root: The parent directory

asoc/codecs/wcd938x/wcd938x.h

@@ -1,19 +1,29 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
  */
 
 #ifndef _WCD938X_H
 #define _WCD938X_H
 
+enum {
+	WCD9380 = 0,
+	WCD9385 = 5,
+};
+
 #ifdef CONFIG_SND_SOC_WCD938X
 extern int wcd938x_info_create_codec_entry(struct snd_info_entry *codec_root,
 				    struct snd_soc_component *component);
+extern int wcd938x_get_codec_variant(struct snd_soc_component *component);
 #else
 extern int wcd938x_info_create_codec_entry(struct snd_info_entry *codec_root,
 				    struct snd_soc_component *component)
 {
 	return 0;
 }
+extern int wcd938x_get_codec_variant(struct snd_soc_component *component)
+{
+	return 0;
+}
 #endif /* CONFIG_SND_SOC_WCD938X */
 #endif /* _WCD938X_H */