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regulator: Add debugfs file showing the supply map table 

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

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2011-08-23 17:39:10 +01:00 committed by Liam Girdwood
parent 500c524aad
commit ba55a9741d
1 changed files with 41 additions and 0 deletions
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41
drivers/regulator/core.c
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@ -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();