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>
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21cf891a47
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@ -17,6 +17,7 @@
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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@ -47,6 +48,10 @@ static LIST_HEAD(regulator_map_list);
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static bool has_full_constraints;
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static bool board_wants_dummy_regulator;
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#ifdef CONFIG_DEBUG_FS
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static struct dentry *debugfs_root;
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#endif
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/*
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* struct regulator_map
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*
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@ -2404,6 +2409,23 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
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return status;
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}
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static void rdev_init_debugfs(struct regulator_dev *rdev)
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{
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#ifdef CONFIG_DEBUG_FS
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rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
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if (IS_ERR(rdev->debugfs) || !rdev->debugfs) {
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rdev_warn(rdev, "Failed to create debugfs directory\n");
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rdev->debugfs = NULL;
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return;
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}
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debugfs_create_u32("use_count", 0444, rdev->debugfs,
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&rdev->use_count);
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debugfs_create_u32("open_count", 0444, rdev->debugfs,
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&rdev->open_count);
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#endif
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}
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/**
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* regulator_register - register regulator
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* @regulator_desc: regulator to register
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@ -2548,6 +2570,8 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
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}
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list_add(&rdev->list, ®ulator_list);
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rdev_init_debugfs(rdev);
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out:
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mutex_unlock(®ulator_list_mutex);
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return rdev;
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@ -2580,6 +2604,9 @@ void regulator_unregister(struct regulator_dev *rdev)
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return;
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mutex_lock(®ulator_list_mutex);
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#ifdef CONFIG_DEBUG_FS
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debugfs_remove_recursive(rdev->debugfs);
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#endif
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WARN_ON(rdev->open_count);
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unset_regulator_supplies(rdev);
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list_del(&rdev->list);
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@ -2723,6 +2750,14 @@ static int __init regulator_init(void)
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ret = class_register(®ulator_class);
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#ifdef CONFIG_DEBUG_FS
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debugfs_root = debugfs_create_dir("regulator", NULL);
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if (IS_ERR(debugfs_root) || !debugfs_root) {
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pr_warn("regulator: Failed to create debugfs directory\n");
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debugfs_root = NULL;
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}
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#endif
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regulator_dummy_init();
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return ret;
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@ -175,9 +175,9 @@ struct regulator_desc {
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*/
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struct regulator_dev {
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struct regulator_desc *desc;
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int use_count;
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int open_count;
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int exclusive;
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u32 use_count;
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u32 open_count;
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/* lists we belong to */
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struct list_head list; /* list of all regulators */
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@ -195,6 +195,10 @@ struct regulator_dev {
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struct regulator_dev *supply; /* for tree */
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void *reg_data; /* regulator_dev data */
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#ifdef CONFIG_DEBUG_FS
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struct dentry *debugfs;
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#endif
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};
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struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
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