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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-08-23 17:39:10 +0100
committerLiam Girdwood <lrg@slimlogic.co.uk>2011-08-28 17:41:59 +0100
commitba55a9741da6c85176987c15e24383b858749aa2 (patch)
treea803b08a17c1dd8736bedac87ba60f347127327f /drivers/regulator
parent500c524aad173864a58e128d0be9713fa5846471 (diff)
downloadop-kernel-dev-ba55a9741da6c85176987c15e24383b858749aa2.zip
op-kernel-dev-ba55a9741da6c85176987c15e24383b858749aa2.tar.gz
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>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index d8e6a42..9a33fe2 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -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();
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