/* * 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 void 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); 		debugfs_create_ulong("u_volt_target", S_IRUGO, d,				     &opp->supplies[i].u_volt); 		debugfs_create_ulong("u_volt_min", S_IRUGO, d,				     &opp->supplies[i].u_volt_min); 		debugfs_create_ulong("u_volt_max", S_IRUGO, d,				     &opp->supplies[i].u_volt_max); 		debugfs_create_ulong("u_amp", S_IRUGO, d,				     &opp->supplies[i].u_amp);	}} void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table){	struct dentry *pdentry = opp_table->dentry;	struct dentry *d;	unsigned long id;	char name[25];	/* 20 chars for 64 bit value + 5 (opp:\0) */ 	/*	 * Get directory name for OPP.	 *	 * - Normally rate is unique to each OPP, use it to get unique opp-name.	 * - For some devices rate isn't available, use index instead.	 */	if (likely(opp->rate))		id = opp->rate;	else		id = _get_opp_count(opp_table); 	snprintf(name, sizeof(name), "opp:%lu", id); 	/* Create per-opp directory */	d = debugfs_create_dir(name, pdentry); 	debugfs_create_bool("available", S_IRUGO, d, &opp->available);	debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic);	debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo);	debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);	debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate);	debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate);	debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,			     &opp->clock_latency_ns); 	opp_debug_create_supplies(opp, opp_table, d); 	opp->dentry = d;} static void 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); 	opp_dev->dentry = d;	opp_table->dentry = d;} static void opp_list_debug_create_link(struct opp_device *opp_dev,				       struct opp_table *opp_table){	char name[NAME_MAX]; 	opp_set_dev_name(opp_dev->dev, name); 	/* Create device specific directory link */	opp_dev->dentry = debugfs_create_symlink(name, rootdir,						 opp_table->dentry_name);} /** * 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. */void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table){	if (opp_table->dentry)		opp_list_debug_create_link(opp_dev, opp_table);	else		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); 	return 0;}core_initcall(opp_debug_init);