ASoC: Add snd_soc_{add, remove}_platform

snd_soc_{add,remove}_platform are similar to snd_soc_register_platform and
snd_soc_unregister_platform with the difference that they won't allocate and
free the snd_soc_platform structure.

Also add snd_soc_lookup_platform which looks up a platform by the device it has
been registered for.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 66 insertions, 23 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index f619905f0a65..4429254aa195 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -373,6 +373,10 @@ int snd_soc_poweroff(struct device *dev);
 int snd_soc_register_platform(struct device *dev,
                 const struct snd_soc_platform_driver *platform_drv);
 void snd_soc_unregister_platform(struct device *dev);
+int snd_soc_add_platform(struct device *dev, struct snd_soc_platform *platform,
+                const struct snd_soc_platform_driver *platform_drv);
+void snd_soc_remove_platform(struct snd_soc_platform *platform);
+struct snd_soc_platform *snd_soc_lookup_platform(struct device *dev);
 int snd_soc_register_codec(struct device *dev,
                 const struct snd_soc_codec_driver *codec_drv,
                 struct snd_soc_dai_driver *dai_drv, int num_dai);
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 4d24b5ea3ba7..0e64af1a7df9 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3901,21 +3901,14 @@ void snd_soc_unregister_dais(struct device *dev, size_t count)
 EXPORT_SYMBOL_GPL(snd_soc_unregister_dais);
 
 /**
- * snd_soc_register_platform - Register a platform with the ASoC core
- *
- * @platform: platform to register
+ * snd_soc_add_platform - Add a platform to the ASoC core
+ * @dev: The parent device for the platform
+ * @platform: The platform to add
+ * @platform_driver: The driver for the platform
  */
-int snd_soc_register_platform(struct device *dev,
+int snd_soc_add_platform(struct device *dev, struct snd_soc_platform *platform,
                 const struct snd_soc_platform_driver *platform_drv)
 {
-        struct snd_soc_platform *platform;
-
-        dev_dbg(dev, "ASoC: platform register %s\n", dev_name(dev));
-
-        platform = kzalloc(sizeof(struct snd_soc_platform), GFP_KERNEL);
-        if (platform == NULL)
-                return -ENOMEM;
-
         /* create platform component name */
         platform->name = fmt_single_name(dev, &platform->id);
         if (platform->name == NULL) {
@@ -3938,30 +3931,76 @@ int snd_soc_register_platform(struct device *dev,
 
         return 0;
 }
-EXPORT_SYMBOL_GPL(snd_soc_register_platform);
+EXPORT_SYMBOL_GPL(snd_soc_add_platform);
 
 /**
- * snd_soc_unregister_platform - Unregister a platform from the ASoC core
+ * snd_soc_register_platform - Register a platform with the ASoC core
  *
- * @platform: platform to unregister
+ * @platform: platform to register
  */
-void snd_soc_unregister_platform(struct device *dev)
+int snd_soc_register_platform(struct device *dev,
+                const struct snd_soc_platform_driver *platform_drv)
 {
         struct snd_soc_platform *platform;
+        int ret;
 
-        list_for_each_entry(platform, &platform_list, list) {
-                if (dev == platform->dev)
-                        goto found;
-        }
-        return;
+        dev_dbg(dev, "ASoC: platform register %s\n", dev_name(dev));
 
-found:
+        platform = kzalloc(sizeof(struct snd_soc_platform), GFP_KERNEL);
+        if (platform == NULL)
+                return -ENOMEM;
+
+        ret = snd_soc_add_platform(dev, platform, platform_drv);
+        if (ret)
+                kfree(platform);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_register_platform);
+
+/**
+ * snd_soc_remove_platform - Remove a platform from the ASoC core
+ * @platform: the platform to remove
+ */
+void snd_soc_remove_platform(struct snd_soc_platform *platform)
+{
         mutex_lock(&client_mutex);
         list_del(&platform->list);
         mutex_unlock(&client_mutex);
 
-        dev_dbg(dev, "ASoC: Unregistered platform '%s'\n", platform->name);
+        dev_dbg(platform->dev, "ASoC: Unregistered platform '%s'\n",
+                platform->name);
         kfree(platform->name);
+}
+EXPORT_SYMBOL_GPL(snd_soc_remove_platform);
+
+struct snd_soc_platform *snd_soc_lookup_platform(struct device *dev)
+{
+        struct snd_soc_platform *platform;
+
+        list_for_each_entry(platform, &platform_list, list) {
+                if (dev == platform->dev)
+                        return platform;
+        }
+
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(snd_soc_lookup_platform);
+
+/**
+ * snd_soc_unregister_platform - Unregister a platform from the ASoC core
+ *
+ * @platform: platform to unregister
+ */
+void snd_soc_unregister_platform(struct device *dev)
+{
+        struct snd_soc_platform *platform;
+
+        platform = snd_soc_lookup_platform(dev);
+        if (!platform)
+                return;
+
+        snd_soc_remove_platform(platform);
         kfree(platform);
 }
 EXPORT_SYMBOL_GPL(snd_soc_unregister_platform);