ALSA: oxfw: Add proc interface for debugging purpose

This commit adds proc interface to get information about stream
formation. This commit also adds snd_oxfw_stream_get_current_formation()
to get current stream formation.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 84 insertions, 0 deletions

diff --git a/sound/firewire/oxfw/oxfw-proc.c b/sound/firewire/oxfw/oxfw-proc.c
new file mode 100644
index 000000000000..18e030572708
--- /dev/null
+++ b/sound/firewire/oxfw/oxfw-proc.c
@@ -0,0 +1,84 @@
+/*
+ * oxfw_proc.c - a part of driver for OXFW970/971 based devices
+ *
+ * Copyright (c) 2014 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include "./oxfw.h"
+
+static void proc_read_formation(struct snd_info_entry *entry,
+				struct snd_info_buffer *buffer)
+{
+	struct snd_oxfw *oxfw = entry->private_data;
+	struct snd_oxfw_stream_formation formation, curr;
+	u8 *format;
+	char flag;
+	unsigned int i, err;
+
+	/* Show input. */
+	err = snd_oxfw_stream_get_current_formation(oxfw,
+						    AVC_GENERAL_PLUG_DIR_IN,
+						    &curr);
+	if (err < 0)
+		return;
+
+	snd_iprintf(buffer, "Input Stream to device:\n");
+	snd_iprintf(buffer, "\tRate\tPCM\tMIDI\n");
+	for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
+		format = oxfw->rx_stream_formats[i];
+		if (format == NULL)
+			continue;
+
+		err = snd_oxfw_stream_parse_format(format, &formation);
+		if (err < 0)
+			continue;
+
+		if (memcmp(&formation, &curr, sizeof(curr)) == 0)
+			flag = '*';
+		else
+			flag = ' ';
+
+		snd_iprintf(buffer, "%c\t%d\t%d\t%d\n", flag,
+			    formation.rate, formation.pcm, formation.midi);
+	}
+
+}
+
+static void add_node(struct snd_oxfw *oxfw, struct snd_info_entry *root,
+		     const char *name,
+		     void (*op)(struct snd_info_entry *e,
+				struct snd_info_buffer *b))
+{
+	struct snd_info_entry *entry;
+
+	entry = snd_info_create_card_entry(oxfw->card, name, root);
+	if (entry == NULL)
+		return;
+
+	snd_info_set_text_ops(entry, oxfw, op);
+	if (snd_info_register(entry) < 0)
+		snd_info_free_entry(entry);
+}
+
+void snd_oxfw_proc_init(struct snd_oxfw *oxfw)
+{
+	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(oxfw->card, "firewire",
+					  oxfw->card->proc_root);
+	if (root == NULL)
+		return;
+	root->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	if (snd_info_register(root) < 0) {
+		snd_info_free_entry(root);
+		return;
+	}
+
+	add_node(oxfw, root, "formation", proc_read_formation);
+}