From 096e49d5e6f7bd93395e7ddf7e0239e1644d0505 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] ASoC: Add CODEC volatile register operation
Add a volatile_register() operation to the CODEC structure providing a
standard operation to query if a register is volatile. This will be used
to factor out the register cache I/O operations for the CODECs.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
include/sound/soc.h | 2 ++
sound/soc/soc-core.c | 17 +++++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/include/sound/soc.h b/include/sound/soc.h
index e6704c0a440..94fcc65609b 100644
--- a/include/sound/soc.h
+++ b/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/sound/soc/soc-core.c b/sound/soc/soc-core.c
index dfc03c0bacb..8bf49a4e664 100644
--- a/sound/soc/soc-core.c
+++ b/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)
{
--
2.20.1