2 files changed, 38 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 6424b10ac29..f30f3fe4a41 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -312,6 +312,10 @@ int snd_soc_default_readable_register(struct snd_soc_codec *codec,
                                       unsigned int reg);
 int snd_soc_default_writable_register(struct snd_soc_codec *codec,
                                       unsigned int reg);
+int snd_soc_platform_read(struct snd_soc_platform *platform,
+                                        unsigned int reg);
+int snd_soc_platform_write(struct snd_soc_platform *platform,
+                                        unsigned int reg, unsigned int val);
 
 /* Utility functions to get clock rates from various things */
 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots);
@@ -658,6 +662,10 @@ struct snd_soc_platform_driver {
         /* probe ordering - for components with runtime dependencies */
         int probe_order;
         int remove_order;
+
+        /* platform IO - used for platform DAPM */
+        unsigned int (*read)(struct snd_soc_platform *, unsigned int);
+        int (*write)(struct snd_soc_platform *, unsigned int, unsigned int);
 };
 
 struct snd_soc_platform {
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index d49f0ed56f9..d08abf4e3eb 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1640,6 +1640,36 @@ int snd_soc_codec_writable_register(struct snd_soc_codec *codec,
 }
 EXPORT_SYMBOL_GPL(snd_soc_codec_writable_register);
 
+int snd_soc_platform_read(struct snd_soc_platform *platform,
+                                        unsigned int reg)
+{
+        unsigned int ret;
+
+        if (!platform->driver->read) {
+                dev_err(platform->dev, "platform has no read back\n");
+                return -1;
+        }
+
+        ret = platform->driver->read(platform, reg);
+        dev_dbg(platform->dev, "read %x => %x\n", reg, ret);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_platform_read);
+
+int snd_soc_platform_write(struct snd_soc_platform *platform,
+                                         unsigned int reg, unsigned int val)
+{
+        if (!platform->driver->write) {
+                dev_err(platform->dev, "platform has no write back\n");
+                return -1;
+        }
+
+        dev_dbg(platform->dev, "write %x = %x\n", reg, val);
+        return platform->driver->write(platform, reg, val);
+}
+EXPORT_SYMBOL_GPL(snd_soc_platform_write);
+
 /**
  * snd_soc_new_ac97_codec - initailise AC97 device
  * @codec: audio codec