[PATCH 2/4] ASoC: arizona: Add utility function to check if an input is analog

[Charles Keepax <ckeepax@opensource.wolfsonmicro.com>]

We will occasionally require to take different action based on if an
input is analog or digital so add a helper function to return if an
input is analog.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---
 sound/soc/codecs/arizona.c |    9 +++++++++
 sound/soc/codecs/arizona.h |    2 ++
 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/sound/soc/codecs/arizona.c b/sound/soc/codecs/arizona.c
index 1bc19f1..ac21b85 100644
--- a/sound/soc/codecs/arizona.c
+++ b/sound/soc/codecs/arizona.c
@@ -691,6 +691,15 @@ static void arizona_in_set_vu(struct snd_soc_codec *codec, int ena)
 				    ARIZONA_IN_VU, val);
 }
 
+bool arizona_input_analog(struct snd_soc_codec *codec, int shift)
+{
+	unsigned int reg = ARIZONA_IN1L_CONTROL + ((shift / 2) * 8);
+	unsigned int val = snd_soc_read(codec, reg);
+
+	return !(val & ARIZONA_IN1_MODE_MASK);
+}
+EXPORT_SYMBOL_GPL(arizona_input_analog);
+
 int arizona_in_ev(struct snd_soc_dapm_widget *w, struct snd_kcontrol *kcontrol,
 		  int event)
 {
diff --git a/sound/soc/codecs/arizona.h b/sound/soc/codecs/arizona.h
index ada0a41..7b68d05 100644
--- a/sound/soc/codecs/arizona.h
+++ b/sound/soc/codecs/arizona.h
@@ -294,4 +294,6 @@ extern int arizona_init_dai(struct arizona_priv *priv, int dai);
 int arizona_set_output_mode(struct snd_soc_codec *codec, int output,
 			    bool diff);
 
+extern bool arizona_input_analog(struct snd_soc_codec *codec, int shift);
+
 #endif
-- 
1.7.2.5