1 files changed, 49 insertions, 0 deletions

diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 1a36b36c5baa..d97a59f6a249 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -1603,3 +1603,52 @@ int snd_soc_cache_sync(struct snd_soc_codec *codec)
         return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(snd_soc_cache_sync);
+
+static int snd_soc_get_reg_access_index(struct snd_soc_codec *codec,
+                                        unsigned int reg)
+{
+        const struct snd_soc_codec_driver *codec_drv;
+        unsigned int min, max, index;
+
+        codec_drv = codec->driver;
+        min = 0;
+        max = codec_drv->reg_access_size - 1;
+        do {
+                index = (min + max) / 2;
+                if (codec_drv->reg_access_default[index].reg == reg)
+                        return index;
+                if (codec_drv->reg_access_default[index].reg < reg)
+                        min = index + 1;
+                else
+                        max = index;
+        } while (min <= max);
+        return -1;
+}
+
+int snd_soc_default_volatile_register(struct snd_soc_codec *codec,
+                                      unsigned int reg)
+{
+        int index;
+
+        if (reg >= codec->driver->reg_cache_size)
+                return 1;
+        index = snd_soc_get_reg_access_index(codec, reg);
+        if (index < 0)
+                return 0;
+        return codec->driver->reg_access_default[index].vol;
+}
+EXPORT_SYMBOL_GPL(snd_soc_default_volatile_register);
+
+int snd_soc_default_readable_register(struct snd_soc_codec *codec,
+                                      unsigned int reg)
+{
+        int index;
+
+        if (reg >= codec->driver->reg_cache_size)
+                return 1;
+        index = snd_soc_get_reg_access_index(codec, reg);
+        if (index < 0)
+                return 0;
+        return codec->driver->reg_access_default[index].read;
+}
+EXPORT_SYMBOL_GPL(snd_soc_default_readable_register);