src/kernel/linux/v4.19/sound/firewire/fireface/ff-proc.c

/*
 * ff-proc.c - a part of driver for RME Fireface series
 *
 * Copyright (c) 2015-2017 Takashi Sakamoto
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include "./ff.h"

static void proc_dump_clock_config(struct snd_info_entry *entry,
				   struct snd_info_buffer *buffer)
{
	struct snd_ff *ff = entry->private_data;

	ff->spec->protocol->dump_clock_config(ff, buffer);
}

static void proc_dump_sync_status(struct snd_info_entry *entry,
				  struct snd_info_buffer *buffer)
{
	struct snd_ff *ff = entry->private_data;

	ff->spec->protocol->dump_sync_status(ff, buffer);
}

static void add_node(struct snd_ff *ff, 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(ff->card, name, root);
	if (entry == NULL)
		return;

	snd_info_set_text_ops(entry, ff, op);
	if (snd_info_register(entry) < 0)
		snd_info_free_entry(entry);
}

void snd_ff_proc_init(struct snd_ff *ff)
{
	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(ff->card, "firewire",
					  ff->card->proc_root);
	if (root == NULL)
		return;
	root->mode = S_IFDIR | 0555;
	if (snd_info_register(root) < 0) {
		snd_info_free_entry(root);
		return;
	}

	add_node(ff, root, "clock-config", proc_dump_clock_config);
	add_node(ff, root, "sync-status", proc_dump_sync_status);
}