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regulator: Add initial per-regulator debugfs support

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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>
This commit is contained in:
Mark Brown 2010-12-21 23:49:31 +00:00 committed by Liam Girdwood
parent 21cf891a47
commit 1130e5b3ff
2 changed files with 41 additions and 2 deletions
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35
drivers/regulator/core.c
View file

@ -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;

8
include/linux/regulator/driver.h
View file

@ -175,9 +175,9 @@ struct regulator_desc {
*/
struct regulator_dev {
struct regulator_desc *desc;
int use_count;
int open_count;
int exclusive;
u32 use_count;
u32 open_count;
/* lists we belong to */
struct list_head list; /* list of all regulators */
@ -195,6 +195,10 @@ struct regulator_dev {
struct regulator_dev *supply; /* for tree */
void *reg_data; /* regulator_dev data */
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs;
#endif
};
struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,