From b31b42178c21b94945faac8ab9aef993426af81f Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Sun, 5 Jul 2009 15:12:22 +0100
Subject: [PATCH] --- yaml --- r: 157544 b: refs/heads/master c:
 096e49d5e6f7bd93395e7ddf7e0239e1644d0505 h: refs/heads/master v: v3

---
 [refs]                     |  2 +-
 trunk/include/sound/soc.h  |  2 ++
 trunk/sound/soc/soc-core.c | 17 +++++++++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 63cb45d16606..395a805c21c7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: af0adf3e81dbcf782388b8a7d0d7094ef5e70f50
+refs/heads/master: 096e49d5e6f7bd93395e7ddf7e0239e1644d0505
diff --git a/trunk/include/sound/soc.h b/trunk/include/sound/soc.h
index e6704c0a4404..94fcc65609b6 100644
--- a/trunk/include/sound/soc.h
+++ b/trunk/include/sound/soc.h
@@ -191,6 +191,7 @@ int snd_soc_register_platform(struct snd_soc_platform *platform);
 void snd_soc_unregister_platform(struct snd_soc_platform *platform);
 int snd_soc_register_codec(struct snd_soc_codec *codec);
 void snd_soc_unregister_codec(struct snd_soc_codec *codec);
+int snd_soc_codec_volatile_register(struct snd_soc_codec *codec, int reg);
 
 #ifdef CONFIG_PM
 int snd_soc_suspend_device(struct device *dev);
@@ -361,6 +362,7 @@ struct snd_soc_codec {
 	int (*write)(struct snd_soc_codec *, unsigned int, unsigned int);
 	int (*display_register)(struct snd_soc_codec *, char *,
 				size_t, unsigned int);
+	int (*volatile_register)(unsigned int);
 	hw_write_t hw_write;
 	hw_read_t hw_read;
 	void *reg_cache;
diff --git a/trunk/sound/soc/soc-core.c b/trunk/sound/soc/soc-core.c
index dfc03c0bacb6..8bf49a4e664a 100644
--- a/trunk/sound/soc/soc-core.c
+++ b/trunk/sound/soc/soc-core.c
@@ -1125,6 +1125,23 @@ static int soc_new_pcm(struct snd_soc_device *socdev,
 	return ret;
 }
 
+/**
+ * snd_soc_codec_volatile_register: Report if a register is volatile.
+ *
+ * @codec: CODEC to query.
+ * @reg: Register to query.
+ *
+ * Boolean function indiciating if a CODEC register is volatile.
+ */
+int snd_soc_codec_volatile_register(struct snd_soc_codec *codec, int reg)
+{
+	if (codec->volatile_register)
+		return codec->volatile_register(reg);
+	else
+		return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_codec_volatile_register);
+
 /* codec register dump */
 static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf)
 {