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/*
* Generic OPP debugfs interface
*
* Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/limits.h>
#include "opp.h"
static struct dentry *rootdir;
static void opp_set_dev_name(const struct device *dev, char *name)
{
if (dev->parent)
snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
dev_name(dev));
else
snprintf(name, NAME_MAX, "%s", dev_name(dev));
}
void opp_debug_remove_one(struct dev_pm_opp *opp)
{
debugfs_remove_recursive(opp->dentry);
}
int opp_debug_create_one(struct dev_pm_opp *opp, struct device_opp *dev_opp)
{
struct dentry *pdentry = dev_opp->dentry;
struct dentry *d;
char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
/* Rate is unique to each OPP, use it to give opp-name */
snprintf(name, sizeof(name), "opp:%lu", opp->rate);
/* Create per-opp directory */
d = debugfs_create_dir(name, pdentry);
if (!d)
return -ENOMEM;
if (!debugfs_create_bool("available", S_IRUGO, d, &opp->available))
return -ENOMEM;
if (!debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic))
return -ENOMEM;
if (!debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo))
return -ENOMEM;
if (!debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend))
return -ENOMEM;
if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate))
return -ENOMEM;
if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d, &opp->u_volt))
return -ENOMEM;
if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d, &opp->u_volt_min))
return -ENOMEM;
if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d, &opp->u_volt_max))
return -ENOMEM;
if (!debugfs_create_ulong("u_amp", S_IRUGO, d, &opp->u_amp))
return -ENOMEM;
if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
&opp->clock_latency_ns))
return -ENOMEM;
opp->dentry = d;
return 0;
}
static int device_opp_debug_create_dir(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
{
const struct device *dev = list_dev->dev;
struct dentry *d;
opp_set_dev_name(dev, dev_opp->dentry_name);
/* Create device specific directory */
d = debugfs_create_dir(dev_opp->dentry_name, rootdir);
if (!d) {
dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);
return -ENOMEM;
}
list_dev->dentry = d;
dev_opp->dentry = d;
return 0;
}
static int device_opp_debug_create_link(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
{
const struct device *dev = list_dev->dev;
char name[NAME_MAX];
struct dentry *d;
opp_set_dev_name(list_dev->dev, name);
/* Create device specific directory link */
d = debugfs_create_symlink(name, rootdir, dev_opp->dentry_name);
if (!d) {
dev_err(dev, "%s: Failed to create link\n", __func__);
return -ENOMEM;
}
list_dev->dentry = d;
return 0;
}
/**
* opp_debug_register - add a device opp node to the debugfs 'opp' directory
* @list_dev: list-dev pointer for device
* @dev_opp: the device-opp being added
*
* Dynamically adds device specific directory in debugfs 'opp' directory. If the
* device-opp is shared with other devices, then links will be created for all
* devices except the first.
*
* Return: 0 on success, otherwise negative error.
*/
int opp_debug_register(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
{
if (!rootdir) {
pr_debug("%s: Uninitialized rootdir\n", __func__);
return -EINVAL;
}
if (dev_opp->dentry)
return device_opp_debug_create_link(list_dev, dev_opp);
return device_opp_debug_create_dir(list_dev, dev_opp);
}
static void opp_migrate_dentry(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
{
struct device_list_opp *new_dev;
const struct device *dev;
struct dentry *dentry;
/* Look for next list-dev */
list_for_each_entry(new_dev, &dev_opp->dev_list, node)
if (new_dev != list_dev)
break;
/* new_dev is guaranteed to be valid here */
dev = new_dev->dev;
debugfs_remove_recursive(new_dev->dentry);
opp_set_dev_name(dev, dev_opp->dentry_name);
dentry = debugfs_rename(rootdir, list_dev->dentry, rootdir,
dev_opp->dentry_name);
if (!dentry) {
dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
__func__, dev_name(list_dev->dev), dev_name(dev));
return;
}
new_dev->dentry = dentry;
dev_opp->dentry = dentry;
}
/**
* opp_debug_unregister - remove a device opp node from debugfs opp directory
* @list_dev: list-dev pointer for device
* @dev_opp: the device-opp being removed
*
* Dynamically removes device specific directory from debugfs 'opp' directory.
*/
void opp_debug_unregister(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
{
if (list_dev->dentry == dev_opp->dentry) {
/* Move the real dentry object under another device */
if (!list_is_singular(&dev_opp->dev_list)) {
opp_migrate_dentry(list_dev, dev_opp);
goto out;
}
dev_opp->dentry = NULL;
}
debugfs_remove_recursive(list_dev->dentry);
out:
list_dev->dentry = NULL;
}
static int __init opp_debug_init(void)
{
/* Create /sys/kernel/debug/opp directory */
rootdir = debugfs_create_dir("opp", NULL);
if (!rootdir) {
pr_err("%s: Failed to create root directory\n", __func__);
return -ENOMEM;
}
return 0;
}
core_initcall(opp_debug_init);
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