ALSA: core: Add an API to create and register module

Add an API to create a module under the given parent
directory and then register the info entry. This API
can be used to expose ID and version related
information.

Change-Id: I06f8bc1d8f649e6db37eb65303e948bc58eab7da
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>

include/sound/info.h

@@ -161,7 +161,9 @@ static inline void snd_info_set_text_ops(struct snd_info_entry *entry,
 }
 
 int snd_info_check_reserved_words(const char *str);
-
+struct snd_info_entry *snd_register_module_info(struct module *module,
+						const char *name,
+						struct snd_info_entry *parent);
 #else
 
 #define snd_seq_root NULL
@@ -190,7 +192,9 @@ static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribut
 					 void *private_data,
 					 void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {}
 static inline int snd_info_check_reserved_words(const char *str) { return 1; }
-
+static inline struct snd_info_entry *snd_register_module_info(
+				struct module *module, const char *name,
+				struct snd_info_entry *parent) { return NULL; }
 #endif
 
 /*

sound/core/info.c

@@ -612,6 +612,36 @@ int snd_info_card_free(struct snd_card *card)
 	return 0;
 }
 
+/*
+ * snd_register_module_info - create and register module
+ * @module: the module pointer
+ * @name: the module name
+ * @parent: the parent directory
+ *
+ * Creates and registers new module entry.
+ *
+ * Return: The pointer of the new instance, or NULL on failure.
+ */
+struct snd_info_entry *snd_register_module_info(struct module *module,
+						const char *name,
+						struct snd_info_entry *parent)
+{
+	struct snd_info_entry *entry;
+
+	entry = snd_info_create_module_entry(module, name, parent);
+	if (!entry)
+		return NULL;
+
+	entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+
+	if (snd_info_register(entry) < 0) {
+		snd_info_free_entry(entry);
+		return NULL;
+	}
+
+	return entry;
+}
+EXPORT_SYMBOL(snd_register_module_info);
 
 /**
  * snd_info_get_line - read one line from the procfs buffer