Initial import

1 files changed, 53 insertions, 0 deletions

diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
new file mode 100644
index 000000000..07f43356f
--- /dev/null
+++ b/sound/soc/soc-cache.c
@@ -0,0 +1,53 @@
+/*
+ * soc-cache.c  --  ASoC register cache helpers
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ */
+
+#include <sound/soc.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+
+int snd_soc_cache_init(struct snd_soc_codec *codec)
+{
+	const struct snd_soc_codec_driver *codec_drv = codec->driver;
+	size_t reg_size;
+
+	reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
+
+	if (!reg_size)
+		return 0;
+
+	dev_dbg(codec->dev, "ASoC: Initializing cache for %s codec\n",
+				codec->component.name);
+
+	if (codec_drv->reg_cache_default)
+		codec->reg_cache = kmemdup(codec_drv->reg_cache_default,
+					   reg_size, GFP_KERNEL);
+	else
+		codec->reg_cache = kzalloc(reg_size, GFP_KERNEL);
+	if (!codec->reg_cache)
+		return -ENOMEM;
+
+	return 0;
+}
+
+/*
+ * NOTE: keep in mind that this function might be called
+ * multiple times.
+ */
+int snd_soc_cache_exit(struct snd_soc_codec *codec)
+{
+	dev_dbg(codec->dev, "ASoC: Destroying cache for %s codec\n",
+			codec->component.name);
+	kfree(codec->reg_cache);
+	codec->reg_cache = NULL;
+	return 0;
+}