ASoC: Add default snd_soc_default_writable_register() callback

By using struct snd_soc_reg_access for the read/write/vol attributes
of the registers, we provide callbacks that automatically determine whether
a given register is readable/writable or volatile.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 4a11795..e208357 100644 (file)
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -292,6 +292,8 @@ int snd_soc_default_volatile_register(struct snd_soc_codec *codec,
                                      unsigned int reg);
 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);
 
 /* Utility functions to get clock rates from various things */
 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots);
@@ -523,6 +525,7 @@ struct snd_soc_codec {
        size_t reg_size;        /* reg_cache_size * reg_word_size */
        int (*volatile_register)(struct snd_soc_codec *, unsigned int);
        int (*readable_register)(struct snd_soc_codec *, unsigned int);
+       int (*writable_register)(struct snd_soc_codec *, unsigned int);
 
        /* runtime */
        struct snd_ac97 *ac97;  /* for ad-hoc ac97 devices */
@@ -589,6 +592,7 @@ struct snd_soc_codec_driver {
                                size_t, unsigned int);
        int (*volatile_register)(struct snd_soc_codec *, unsigned int);
        int (*readable_register)(struct snd_soc_codec *, unsigned int);
+       int (*writable_register)(struct snd_soc_codec *, unsigned int);
        short reg_cache_size;
        short reg_cache_step;
        short reg_word_size;

diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 258c3b2..1210a6f 100644 (file)
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -1449,3 +1449,17 @@ int snd_soc_default_readable_register(struct snd_soc_codec *codec,
        return codec->driver->reg_access_default[index].read;
 }
 EXPORT_SYMBOL_GPL(snd_soc_default_readable_register);
+
+int snd_soc_default_writable_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].write;
+}
+EXPORT_SYMBOL_GPL(snd_soc_default_writable_register);

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 636328e..074a0c6 100644 (file)
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3673,6 +3673,7 @@ int snd_soc_register_codec(struct device *dev,
        codec->read = codec_drv->read;
        codec->volatile_register = codec_drv->volatile_register;
        codec->readable_register = codec_drv->readable_register;
+       codec->writable_register = codec_drv->writable_register;
        codec->dapm.bias_level = SND_SOC_BIAS_OFF;
        codec->dapm.dev = dev;
        codec->dapm.codec = codec;
@@ -3707,6 +3708,8 @@ int snd_soc_register_codec(struct device *dev,
                        codec->volatile_register = snd_soc_default_volatile_register;
                if (!codec->readable_register)
                        codec->readable_register = snd_soc_default_readable_register;
+               if (!codec->writable_register)
+                       codec->writable_register = snd_soc_default_writable_register;
        }
 
        for (i = 0; i < num_dai; i++) {