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authorMark Brown <broonie@opensource.wolfsonmicro.com>2010-12-21 23:49:31 +0000
committerLiam Girdwood <lrg@slimlogic.co.uk>2011-01-12 14:33:05 +0000
commit1130e5b3ff4a7f3f54a48d46e9d0d81b47765bd8 (patch)
tree333918bbdd573be8efdc7004a6018f34bfd70a77 /drivers/regulator
parent21cf891a47ff5e7bd77fdc524a25072c447d56bb (diff)
regulator: Add initial per-regulator debugfs support
We only expose the use and open counts to userspace, providing a tiny bit of insight into what the API is up to. 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.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 6066a8f2d5b..9fa20957847 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -17,6 +17,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
+#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/err.h>
@@ -47,6 +48,10 @@ static LIST_HEAD(regulator_map_list);
static bool has_full_constraints;
static bool board_wants_dummy_regulator;
+#ifdef CONFIG_DEBUG_FS
+static struct dentry *debugfs_root;
+#endif
+
/*
* struct regulator_map
*
@@ -2404,6 +2409,23 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
return status;
}
+static void rdev_init_debugfs(struct regulator_dev *rdev)
+{
+#ifdef CONFIG_DEBUG_FS
+ rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
+ if (IS_ERR(rdev->debugfs) || !rdev->debugfs) {
+ rdev_warn(rdev, "Failed to create debugfs directory\n");
+ rdev->debugfs = NULL;
+ return;
+ }
+
+ debugfs_create_u32("use_count", 0444, rdev->debugfs,
+ &rdev->use_count);
+ debugfs_create_u32("open_count", 0444, rdev->debugfs,
+ &rdev->open_count);
+#endif
+}
+
/**
* regulator_register - register regulator
* @regulator_desc: regulator to register
@@ -2548,6 +2570,8 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
}
list_add(&rdev->list, &regulator_list);
+
+ rdev_init_debugfs(rdev);
out:
mutex_unlock(&regulator_list_mutex);
return rdev;
@@ -2580,6 +2604,9 @@ void regulator_unregister(struct regulator_dev *rdev)
return;
mutex_lock(&regulator_list_mutex);
+#ifdef CONFIG_DEBUG_FS
+ debugfs_remove_recursive(rdev->debugfs);
+#endif
WARN_ON(rdev->open_count);
unset_regulator_supplies(rdev);
list_del(&rdev->list);
@@ -2723,6 +2750,14 @@ static int __init regulator_init(void)
ret = class_register(&regulator_class);
+#ifdef CONFIG_DEBUG_FS
+ debugfs_root = debugfs_create_dir("regulator", NULL);
+ if (IS_ERR(debugfs_root) || !debugfs_root) {
+ pr_warn("regulator: Failed to create debugfs directory\n");
+ debugfs_root = NULL;
+ }
+#endif
+
regulator_dummy_init();
return ret;