ALSA: core: modify, rename and export create_subdir API

Modify create_subdir API, so that it can create a subdir
under a given parent directory and then register the info
entry. Also rename and export the API so that it can be
used to expose ID and version related information.

Change-Id: Id8a29ce575199ccee009619f9a6692e59964df50
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>
Signed-off-by: Meng Wang <mwang@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_info_create_subdir(struct module *mod,
+					      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_info_create_subdir(
+				struct module *mod, const char *name,
+				struct snd_info_entry *parent) { return NULL; }
 #endif
 
 /*

sound/core/info.c

@@ -446,12 +446,23 @@ static const struct file_operations snd_info_text_entry_ops =
 	.read =			seq_read,
 };
 
-static struct snd_info_entry *create_subdir(struct module *mod,
-					    const char *name)
+/*
+ * snd_info_create_subdir - create and register a subdir for a given parent
+ * @mod: the module pointer
+ * @name: the module name
+ * @parent: the parent directory
+ *
+ * Creates and registers new subdir entry inside a given parent.
+ *
+ * Return: The pointer of the new instance, or NULL on failure.
+ */
+struct snd_info_entry *snd_info_create_subdir(struct module *mod,
+					      const char *name,
+					      struct snd_info_entry *parent)
 {
 	struct snd_info_entry *entry;
 
-	entry = snd_info_create_module_entry(mod, name, NULL);
+	entry = snd_info_create_module_entry(mod, name, parent);
 	if (!entry)
 		return NULL;
 	entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
@@ -461,6 +472,7 @@ static struct snd_info_entry *create_subdir(struct module *mod,
 	}
 	return entry;
 }
+EXPORT_SYMBOL(snd_info_create_subdir);
 
 static struct snd_info_entry *
 snd_info_create_entry(const char *name, struct snd_info_entry *parent);
@@ -475,12 +487,12 @@ int __init snd_info_init(void)
 	if (!snd_proc_root->p)
 		goto error;
 #ifdef CONFIG_SND_OSSEMUL
-	snd_oss_root = create_subdir(THIS_MODULE, "oss");
+	snd_oss_root = snd_info_create_subdir(THIS_MODULE, "oss", NULL);
 	if (!snd_oss_root)
 		goto error;
 #endif
 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
-	snd_seq_root = create_subdir(THIS_MODULE, "seq");
+	snd_seq_root = snd_info_create_subdir(THIS_MODULE, "seq", NULL);
 	if (!snd_seq_root)
 		goto error;
 #endif
@@ -516,7 +528,7 @@ int snd_info_card_create(struct snd_card *card)
 		return -ENXIO;
 
 	sprintf(str, "card%i", card->number);
-	entry = create_subdir(card->module, str);
+	entry = snd_info_create_subdir(card->module, str, NULL);
 	if (!entry)
 		return -ENOMEM;
 	card->proc_root = entry;
@@ -619,7 +631,6 @@ int snd_info_card_free(struct snd_card *card)
 	return 0;
 }
 
-
 /**
  * snd_info_get_line - read one line from the procfs buffer
  * @buffer: the procfs buffer