ASoC: Add helper functions for deferred regmap setup

Some drivers (most notably the AC'97 drivers) do not have access to their
regmap struct when the component/codec is registered. For those drivers the
automatic regmap setup will not work and needs to be done manually,
typically from the component/CODEC drivers probe callback.

This patch adds a set of helper function to handle deferred regmap
initialization as well as early regmap tear-down.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 82 insertions, 11 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 7ba7130037a0..342b43b3799e 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1277,6 +1277,41 @@ void snd_soc_component_async_complete(struct snd_soc_component *component);
 int snd_soc_component_test_bits(struct snd_soc_component *component,
         unsigned int reg, unsigned int mask, unsigned int value);
 
+void snd_soc_component_init_regmap(struct snd_soc_component *component,
+        struct regmap *regmap);
+void snd_soc_component_exit_regmap(struct snd_soc_component *component);
+
+/**
+ * snd_soc_codec_init_regmap() - Initialize regmap instance for the CODEC
+ * @codec: The CODEC for which to initialize the regmap instance
+ * @regmap: The regmap instance that should be used by the CODEC
+ *
+ * This function allows deferred assignment of the regmap instance that is
+ * associated with the CODEC. Only use this if the regmap instance is not yet
+ * ready when the CODEC is registered. The function must also be called before
+ * the first IO attempt of the CODEC.
+ */
+static inline void snd_soc_codec_init_regmap(struct snd_soc_codec *codec,
+        struct regmap *regmap)
+{
+        snd_soc_component_init_regmap(&codec->component, regmap);
+}
+
+/**
+ * snd_soc_codec_exit_regmap() - De-initialize regmap instance for the CODEC
+ * @codec: The CODEC for which to de-initialize the regmap instance
+ *
+ * Calls regmap_exit() on the regmap instance associated to the CODEC and
+ * removes the regmap instance from the CODEC.
+ *
+ * This function should only be used if snd_soc_codec_init_regmap() was used to
+ * initialize the regmap instance.
+ */
+static inline void snd_soc_codec_exit_regmap(struct snd_soc_codec *codec)
+{
+        snd_soc_component_exit_regmap(&codec->component);
+}
+
 /* device driver data */
 
 static inline void snd_soc_card_set_drvdata(struct snd_soc_card *card,
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 4c8f8a23a0e9..5fd5f08ce24e 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3996,22 +3996,58 @@ static int snd_soc_component_initialize(struct snd_soc_component *component,
         return 0;
 }
 
-static void snd_soc_component_init_regmap(struct snd_soc_component *component)
+static void snd_soc_component_setup_regmap(struct snd_soc_component *component)
 {
-        if (!component->regmap)
-                component->regmap = dev_get_regmap(component->dev, NULL);
-        if (component->regmap) {
-                int val_bytes = regmap_get_val_bytes(component->regmap);
-                /* Errors are legitimate for non-integer byte multiples */
-                if (val_bytes > 0)
-                        component->val_bytes = val_bytes;
-        }
+        int val_bytes = regmap_get_val_bytes(component->regmap);
+
+        /* Errors are legitimate for non-integer byte multiples */
+        if (val_bytes > 0)
+                component->val_bytes = val_bytes;
+}
+
+/**
+ * snd_soc_component_init_regmap() - Initialize regmap instance for the component
+ * @component: The component for which to initialize the regmap instance
+ * @regmap: The regmap instance that should be used by the component
+ *
+ * This function allows deferred assignment of the regmap instance that is
+ * associated with the component. Only use this if the regmap instance is not
+ * yet ready when the component is registered. The function must also be called
+ * before the first IO attempt of the component.
+ */
+void snd_soc_component_init_regmap(struct snd_soc_component *component,
+        struct regmap *regmap)
+{
+        component->regmap = regmap;
+        snd_soc_component_setup_regmap(component);
 }
+EXPORT_SYMBOL_GPL(snd_soc_component_init_regmap);
+
+/**
+ * snd_soc_component_exit_regmap() - De-initialize regmap instance for the component
+ * @component: The component for which to de-initialize the regmap instance
+ *
+ * Calls regmap_exit() on the regmap instance associated to the component and
+ * removes the regmap instance from the component.
+ *
+ * This function should only be used if snd_soc_component_init_regmap() was used
+ * to initialize the regmap instance.
+ */
+void snd_soc_component_exit_regmap(struct snd_soc_component *component)
+{
+        regmap_exit(component->regmap);
+        component->regmap = NULL;
+}
+EXPORT_SYMBOL_GPL(snd_soc_component_exit_regmap);
 
 static void snd_soc_component_add_unlocked(struct snd_soc_component *component)
 {
-        if (!component->write && !component->read)
-                snd_soc_component_init_regmap(component);
+        if (!component->write && !component->read) {
+                if (!component->regmap)
+                        component->regmap = dev_get_regmap(component->dev, NULL);
+                if (component->regmap)
+                        snd_soc_component_setup_regmap(component);
+        }
 
         list_add(&component->list, &component_list);
 }