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Commit 1130e5b3 authored by Mark Brown's avatar Mark Brown Committed by Liam Girdwood
Browse files

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

drivers/regulator/core.c

+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;

include/linux/regulator/driver.h

+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,