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Commit 1130e5b3 authored by Mark Brown's avatar Mark Brown Committed by Liam Girdwood
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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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent 21cf891a
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+35 −0
Original line number Diff line number Diff line
@@ -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;
+6 −2
Original line number Diff line number Diff line
@@ -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,