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>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index cc3dfd6..f59821f 100644 (file)
--- 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);