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Commit ba55a974 authored by Mark Brown's avatar Mark Brown Committed by Liam Girdwood
Browse files

regulator: Add debugfs file showing the supply map table 



Useful for working out why things aren't getting plugged together properly.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent 500c524a

drivers/regulator/core.c

+41 −0
Original line number Diff line number Diff line
@@ -2907,6 +2907,43 @@ void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 
}

EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);



#ifdef CONFIG_DEBUG_FS

static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,

				    size_t count, loff_t *ppos)

{

	char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);

	ssize_t len, ret = 0;

	struct regulator_map *map;



	if (!buf)

		return -ENOMEM;



	list_for_each_entry(map, &regulator_map_list, list) {

		len = snprintf(buf + ret, PAGE_SIZE - ret,

			       "%s -> %s.%s\n",

			       rdev_get_name(map->regulator), map->dev_name,

			       map->supply);

		if (len >= 0)

			ret += len;

		if (ret > PAGE_SIZE) {

			ret = PAGE_SIZE;

			break;

		}

	}



	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);



	kfree(buf);



	return ret;

}



static const struct file_operations supply_map_fops = {

	.read = supply_map_read_file,

	.llseek = default_llseek,

};

#endif



static int __init regulator_init(void)

{

	int ret;
@@ -2919,6 +2956,10 @@ static int __init regulator_init(void) 
		pr_warn("regulator: Failed to create debugfs directory\n");

		debugfs_root = NULL;

	}



	if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root,

				       NULL, &supply_map_fops)))

		pr_warn("regulator: Failed to create supplies debugfs\n");

#endif



	regulator_dummy_init();