void regmap_debugfs_init()

in regmap/regmap-debugfs.c [546:653]

• 83 lines of code
• 17 McCabe index (conditional complexity)

void regmap_debugfs_init(struct regmap *map)
{
	struct rb_node *next;
	struct regmap_range_node *range_node;
	const char *devname = "dummy";
	const char *name = map->name;

	/*
	 * Userspace can initiate reads from the hardware over debugfs.
	 * Normally internal regmap structures and buffers are protected with
	 * a mutex or a spinlock, but if the regmap owner decided to disable
	 * all locking mechanisms, this is no longer the case. For safety:
	 * don't create the debugfs entries if locking is disabled.
	 */
	if (map->debugfs_disable) {
		dev_dbg(map->dev, "regmap locking disabled - not creating debugfs entries\n");
		return;
	}

	/* If we don't have the debugfs root yet, postpone init */
	if (!regmap_debugfs_root) {
		struct regmap_debugfs_node *node;
		node = kzalloc(sizeof(*node), GFP_KERNEL);
		if (!node)
			return;
		node->map = map;
		mutex_lock(&regmap_debugfs_early_lock);
		list_add(&node->link, &regmap_debugfs_early_list);
		mutex_unlock(&regmap_debugfs_early_lock);
		return;
	}

	INIT_LIST_HEAD(&map->debugfs_off_cache);
	mutex_init(&map->cache_lock);

	if (map->dev)
		devname = dev_name(map->dev);

	if (name) {
		if (!map->debugfs_name) {
			map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
					      devname, name);
			if (!map->debugfs_name)
				return;
		}
		name = map->debugfs_name;
	} else {
		name = devname;
	}

	if (!strcmp(name, "dummy")) {
		kfree(map->debugfs_name);
		map->debugfs_name = kasprintf(GFP_KERNEL, "dummy%d",
						dummy_index);
		if (!map->debugfs_name)
			return;
		name = map->debugfs_name;
		dummy_index++;
	}

	map->debugfs = debugfs_create_dir(name, regmap_debugfs_root);

	debugfs_create_file("name", 0400, map->debugfs,
			    map, &regmap_name_fops);

	debugfs_create_file("range", 0400, map->debugfs,
			    map, &regmap_reg_ranges_fops);

	if (map->max_register || regmap_readable(map, 0)) {
		umode_t registers_mode;

#if defined(REGMAP_ALLOW_WRITE_DEBUGFS)
		registers_mode = 0600;
#else
		registers_mode = 0400;
#endif

		debugfs_create_file("registers", registers_mode, map->debugfs,
				    map, &regmap_map_fops);
		debugfs_create_file("access", 0400, map->debugfs,
				    map, &regmap_access_fops);
	}

	if (map->cache_type) {
		debugfs_create_file("cache_only", 0600, map->debugfs,
				    &map->cache_only, &regmap_cache_only_fops);
		debugfs_create_bool("cache_dirty", 0400, map->debugfs,
				    &map->cache_dirty);
		debugfs_create_file("cache_bypass", 0600, map->debugfs,
				    &map->cache_bypass,
				    &regmap_cache_bypass_fops);
	}

	next = rb_first(&map->range_tree);
	while (next) {
		range_node = rb_entry(next, struct regmap_range_node, node);

		if (range_node->name)
			debugfs_create_file(range_node->name, 0400,
					    map->debugfs, range_node,
					    &regmap_range_fops);

		next = rb_next(&range_node->node);
	}

	if (map->cache_ops && map->cache_ops->debugfs_init)
		map->cache_ops->debugfs_init(map);
}