/* * 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 <linux/slab.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);} static bool opp_debug_create_supplies(struct dev_pm_opp *opp,				      struct opp_table *opp_table,				      struct dentry *pdentry){	struct dentry *d;	int i; 	for (i = 0; i < opp_table->regulator_count; i++) {		char name[15]; 		snprintf(name, sizeof(name), "supply-%d", i); 		/* Create per-opp directory */		d = debugfs_create_dir(name, pdentry); 		if (!d)			return false; 		if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d,					  &opp->supplies[i].u_volt))			return false; 		if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d,					  &opp->supplies[i].u_volt_min))			return false; 		if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d,					  &opp->supplies[i].u_volt_max))			return false; 		if (!debugfs_create_ulong("u_amp", S_IRUGO, d,					  &opp->supplies[i].u_amp))			return false;	} 	return true;} int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table){	struct dentry *pdentry = opp_table->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_u32("performance_state", S_IRUGO, d, &opp->pstate))		return -ENOMEM; 	if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate))		return -ENOMEM; 	if (!opp_debug_create_supplies(opp, opp_table, d))		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 opp_list_debug_create_dir(struct opp_device *opp_dev,				     struct opp_table *opp_table){	const struct device *dev = opp_dev->dev;	struct dentry *d; 	opp_set_dev_name(dev, opp_table->dentry_name); 	/* Create device specific directory */	d = debugfs_create_dir(opp_table->dentry_name, rootdir);	if (!d) {		dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);		return -ENOMEM;	} 	opp_dev->dentry = d;	opp_table->dentry = d; 	return 0;} static int opp_list_debug_create_link(struct opp_device *opp_dev,				      struct opp_table *opp_table){	const struct device *dev = opp_dev->dev;	char name[NAME_MAX];	struct dentry *d; 	opp_set_dev_name(opp_dev->dev, name); 	/* Create device specific directory link */	d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name);	if (!d) {		dev_err(dev, "%s: Failed to create link\n", __func__);		return -ENOMEM;	} 	opp_dev->dentry = d; 	return 0;} /** * opp_debug_register - add a device opp node to the debugfs 'opp' directory * @opp_dev: opp-dev pointer for device * @opp_table: 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 opp_device *opp_dev, struct opp_table *opp_table){	if (!rootdir) {		pr_debug("%s: Uninitialized rootdir\n", __func__);		return -EINVAL;	} 	if (opp_table->dentry)		return opp_list_debug_create_link(opp_dev, opp_table); 	return opp_list_debug_create_dir(opp_dev, opp_table);} static void opp_migrate_dentry(struct opp_device *opp_dev,			       struct opp_table *opp_table){	struct opp_device *new_dev;	const struct device *dev;	struct dentry *dentry; 	/* Look for next opp-dev */	list_for_each_entry(new_dev, &opp_table->dev_list, node)		if (new_dev != opp_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, opp_table->dentry_name); 	dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,				opp_table->dentry_name);	if (!dentry) {		dev_err(dev, "%s: Failed to rename link from: %s to %s\n",			__func__, dev_name(opp_dev->dev), dev_name(dev));		return;	} 	new_dev->dentry = dentry;	opp_table->dentry = dentry;} /** * opp_debug_unregister - remove a device opp node from debugfs opp directory * @opp_dev: opp-dev pointer for device * @opp_table: the device-opp being removed * * Dynamically removes device specific directory from debugfs 'opp' directory. */void opp_debug_unregister(struct opp_device *opp_dev,			  struct opp_table *opp_table){	if (opp_dev->dentry == opp_table->dentry) {		/* Move the real dentry object under another device */		if (!list_is_singular(&opp_table->dev_list)) {			opp_migrate_dentry(opp_dev, opp_table);			goto out;		}		opp_table->dentry = NULL;	} 	debugfs_remove_recursive(opp_dev->dentry); out:	opp_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);