regulator: Add basic per consumer debugfs

Report the requested load and voltage for each consumer in debugfs when it
is enabled.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 29 insertions, 1 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index cc3dfd66f395..f59821f10fdc 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -81,6 +81,9 @@ struct regulator {
         char *supply_name;
         struct device_attribute dev_attr;
         struct regulator_dev *rdev;
+#ifdef CONFIG_DEBUG_FS
+        struct dentry *debugfs;
+#endif
 };
 
 static int _regulator_is_enabled(struct regulator_dev *rdev);
@@ -1093,7 +1096,28 @@ static struct regulator *create_regulator(struct regulator_dev *rdev,
                                   dev->kobj.name, err);
                         goto link_name_err;
                 }
+        } else {
+                regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
+                if (regulator->supply_name == NULL)
+                        goto attr_err;
+        }
+
+#ifdef CONFIG_DEBUG_FS
+        regulator->debugfs = debugfs_create_dir(regulator->supply_name,
+                                                rdev->debugfs);
+        if (IS_ERR_OR_NULL(regulator->debugfs)) {
+                rdev_warn(rdev, "Failed to create debugfs directory\n");
+                regulator->debugfs = NULL;
+        } else {
+                debugfs_create_u32("uA_load", 0444, regulator->debugfs,
+                                   &regulator->uA_load);
+                debugfs_create_u32("min_uV", 0444, regulator->debugfs,
+                                   &regulator->min_uV);
+                debugfs_create_u32("max_uV", 0444, regulator->debugfs,
+                                   &regulator->max_uV);
         }
+#endif
+
         mutex_unlock(&rdev->mutex);
         return regulator;
 link_name_err:
@@ -1272,13 +1296,17 @@ void regulator_put(struct regulator *regulator)
         mutex_lock(&regulator_list_mutex);
         rdev = regulator->rdev;
 
+#ifdef CONFIG_DEBUG_FS
+        debugfs_remove_recursive(regulator->debugfs);
+#endif
+
         /* remove any sysfs entries */
         if (regulator->dev) {
                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
-                kfree(regulator->supply_name);
                 device_remove_file(regulator->dev, &regulator->dev_attr);
                 kfree(regulator->dev_attr.attr.name);
         }
+        kfree(regulator->supply_name);
         list_del(&regulator->list);
         kfree(regulator);