ALSA: dice: add 'firewire' directory for proc nodes

Unlike the other drivers in ALSA firewire stack, ALSA dice driver does't
create 'firewire' directory for proc nodes because it has 'dice' node
only. But this is inconvenient because I have a plan to add another proc
node to output available stream formats from cache.

This commit let the driver to create the directory and put 'dice' node
into it.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/dice/dice-proc.c

@@ -243,10 +243,39 @@ static void dice_proc_read(struct snd_info_entry *entry,
 	}
 }
 
-void snd_dice_create_proc(struct snd_dice *dice)
+static void add_node(struct snd_dice *dice, struct snd_info_entry *root,
+		     const char *name,
+		     void (*op)(struct snd_info_entry *entry,
+				struct snd_info_buffer *buffer))
 {
 	struct snd_info_entry *entry;
 
-	if (!snd_card_proc_new(dice->card, "dice", &entry))
-		snd_info_set_text_ops(entry, dice, dice_proc_read);
+	entry = snd_info_create_card_entry(dice->card, name, root);
+	if (!entry)
+		return;
+
+	snd_info_set_text_ops(entry, dice, op);
+	if (snd_info_register(entry) < 0)
+		snd_info_free_entry(entry);
+}
+
+void snd_dice_create_proc(struct snd_dice *dice)
+{
+	struct snd_info_entry *root;
+
+	/*
+	 * All nodes are automatically removed at snd_card_disconnect(),
+	 * by following to link list.
+	 */
+	root = snd_info_create_card_entry(dice->card, "firewire",
+					  dice->card->proc_root);
+	if (!root)
+		return;
+	root->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	if (snd_info_register(root) < 0) {
+		snd_info_free_entry(root);
+		return;
+	}
+
+	add_node(dice, root, "dice", dice_proc_read);
 }