// SPDX-License-Identifier: GPL-2.0#include <linux/of.h>#include <linux/slab.h> #include "of_private.h" /* true when node is initialized */static int of_node_is_initialized(const struct device_node *node){	return node && node->kobj.state_initialized;} /* true when node is attached (i.e. present on sysfs) */int of_node_is_attached(const struct device_node *node){	return node && node->kobj.state_in_sysfs;}  #ifndef CONFIG_OF_DYNAMICstatic void of_node_release(struct kobject *kobj){	/* Without CONFIG_OF_DYNAMIC, no nodes gets freed */}#endif /* CONFIG_OF_DYNAMIC */ struct kobj_type of_node_ktype = {	.release = of_node_release,}; static ssize_t of_node_property_read(struct file *filp, struct kobject *kobj,				struct bin_attribute *bin_attr, char *buf,				loff_t offset, size_t count){	struct property *pp = container_of(bin_attr, struct property, attr);	return memory_read_from_buffer(buf, count, &offset, pp->value, pp->length);} /* always return newly allocated name, caller must free after use */static const char *safe_name(struct kobject *kobj, const char *orig_name){	const char *name = orig_name;	struct kernfs_node *kn;	int i = 0; 	/* don't be a hero. After 16 tries give up */	while (i < 16 && (kn = sysfs_get_dirent(kobj->sd, name))) {		sysfs_put(kn);		if (name != orig_name)			kfree(name);		name = kasprintf(GFP_KERNEL, "%s#%i", orig_name, ++i);	} 	if (name == orig_name) {		name = kstrdup(orig_name, GFP_KERNEL);	} else {		pr_warn("Duplicate name in %s, renamed to \"%s\"\n",			kobject_name(kobj), name);	}	return name;} int __of_add_property_sysfs(struct device_node *np, struct property *pp){	int rc; 	/* Important: Don't leak passwords */	bool secure = strncmp(pp->name, "security-", 9) == 0; 	if (!IS_ENABLED(CONFIG_SYSFS))		return 0; 	if (!of_kset || !of_node_is_attached(np))		return 0; 	sysfs_bin_attr_init(&pp->attr);	pp->attr.attr.name = safe_name(&np->kobj, pp->name);	pp->attr.attr.mode = secure ? 0400 : 0444;	pp->attr.size = secure ? 0 : pp->length;	pp->attr.read = of_node_property_read; 	rc = sysfs_create_bin_file(&np->kobj, &pp->attr);	WARN(rc, "error adding attribute %s to node %pOF\n", pp->name, np);	return rc;} void __of_sysfs_remove_bin_file(struct device_node *np, struct property *prop){	if (!IS_ENABLED(CONFIG_SYSFS))		return; 	sysfs_remove_bin_file(&np->kobj, &prop->attr);	kfree(prop->attr.attr.name);} void __of_remove_property_sysfs(struct device_node *np, struct property *prop){	/* at early boot, bail here and defer setup to of_init() */	if (of_kset && of_node_is_attached(np))		__of_sysfs_remove_bin_file(np, prop);} void __of_update_property_sysfs(struct device_node *np, struct property *newprop,		struct property *oldprop){	/* At early boot, bail out and defer setup to of_init() */	if (!of_kset)		return; 	if (oldprop)		__of_sysfs_remove_bin_file(np, oldprop);	__of_add_property_sysfs(np, newprop);} int __of_attach_node_sysfs(struct device_node *np){	const char *name;	struct kobject *parent;	struct property *pp;	int rc; 	if (!IS_ENABLED(CONFIG_SYSFS) || !of_kset)		return 0; 	np->kobj.kset = of_kset;	if (!np->parent) {		/* Nodes without parents are new top level trees */		name = safe_name(&of_kset->kobj, "base");		parent = NULL;	} else {		name = safe_name(&np->parent->kobj, kbasename(np->full_name));		parent = &np->parent->kobj;	}	if (!name)		return -ENOMEM; 	rc = kobject_add(&np->kobj, parent, "%s", name);	kfree(name);	if (rc)		return rc; 	for_each_property_of_node(np, pp)		__of_add_property_sysfs(np, pp); 	of_node_get(np);	return 0;} void __of_detach_node_sysfs(struct device_node *np){	struct property *pp; 	BUG_ON(!of_node_is_initialized(np));	if (!of_kset)		return; 	/* only remove properties if on sysfs */	if (of_node_is_attached(np)) {		for_each_property_of_node(np, pp)			__of_sysfs_remove_bin_file(np, pp);		kobject_del(&np->kobj);	} 	of_node_put(np);}