#include <linux/of.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
+#include <linux/string.h>
#include <linux/proc_fs.h>
#include "of_private.h"
struct device_node *of_aliases;
static struct device_node *of_stdout;
+static struct kset *of_kset;
+
+/*
+ * Used to protect the of_aliases; but also overloaded to hold off addition of
+ * nodes to sysfs
+ */
DEFINE_MUTEX(of_aliases_mutex);
/* use when traversing tree through the allnext, child, sibling,
struct device_node *of_node_get(struct device_node *node)
{
if (node)
- kref_get(&node->kref);
+ kobject_get(&node->kobj);
return node;
}
EXPORT_SYMBOL(of_node_get);
-static inline struct device_node *kref_to_device_node(struct kref *kref)
+static inline struct device_node *kobj_to_device_node(struct kobject *kobj)
{
- return container_of(kref, struct device_node, kref);
+ return container_of(kobj, struct device_node, kobj);
}
/**
* In of_node_put() this function is passed to kref_put()
* as the destructor.
*/
-static void of_node_release(struct kref *kref)
+static void of_node_release(struct kobject *kobj)
{
- struct device_node *node = kref_to_device_node(kref);
+ struct device_node *node = kobj_to_device_node(kobj);
struct property *prop = node->properties;
/* We should never be releasing nodes that haven't been detached. */
if (!of_node_check_flag(node, OF_DETACHED)) {
pr_err("ERROR: Bad of_node_put() on %s\n", node->full_name);
dump_stack();
- kref_init(&node->kref);
return;
}
void of_node_put(struct device_node *node)
{
if (node)
- kref_put(&node->kref, of_node_release);
+ kobject_put(&node->kobj);
}
EXPORT_SYMBOL(of_node_put);
+#else
+static 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);
+}
+
+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)
+ pr_warn("device-tree: Duplicate name in %s, renamed to \"%s\"\n",
+ kobject_name(kobj), name);
+ return name;
+}
+
+static 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;
+
+ sysfs_bin_attr_init(&pp->attr);
+ pp->attr.attr.name = safe_name(&np->kobj, pp->name);
+ pp->attr.attr.mode = secure ? S_IRUSR : S_IRUGO;
+ 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 %s\n", pp->name, np->full_name);
+ return rc;
+}
+
+static int __of_node_add(struct device_node *np)
+{
+ const char *name;
+ struct property *pp;
+ int rc;
+
+ np->kobj.kset = of_kset;
+ if (!np->parent) {
+ /* Nodes without parents are new top level trees */
+ rc = kobject_add(&np->kobj, NULL, safe_name(&of_kset->kobj, "base"));
+ } else {
+ name = safe_name(&np->parent->kobj, kbasename(np->full_name));
+ if (!name || !name[0])
+ return -EINVAL;
+
+ rc = kobject_add(&np->kobj, &np->parent->kobj, "%s", name);
+ }
+ if (rc)
+ return rc;
+
+ for_each_property_of_node(np, pp)
+ __of_add_property_sysfs(np, pp);
+
+ return 0;
+}
+
+int of_node_add(struct device_node *np)
+{
+ int rc = 0;
+ kobject_init(&np->kobj, &of_node_ktype);
+ mutex_lock(&of_aliases_mutex);
+ if (of_kset)
+ rc = __of_node_add(np);
+ mutex_unlock(&of_aliases_mutex);
+ return rc;
+}
+
+#if defined(CONFIG_OF_DYNAMIC)
+static void of_node_remove(struct device_node *np)
+{
+ struct property *pp;
+
+ for_each_property_of_node(np, pp)
+ sysfs_remove_bin_file(&np->kobj, &pp->attr);
+
+ kobject_del(&np->kobj);
+}
+#endif
+
+static int __init of_init(void)
+{
+ struct device_node *np;
+
+ /* Create the kset, and register existing nodes */
+ mutex_lock(&of_aliases_mutex);
+ of_kset = kset_create_and_add("devicetree", NULL, firmware_kobj);
+ if (!of_kset) {
+ mutex_unlock(&of_aliases_mutex);
+ return -ENOMEM;
+ }
+ for_each_of_allnodes(np)
+ __of_node_add(np);
+ mutex_unlock(&of_aliases_mutex);
+
+#if !defined(CONFIG_PROC_DEVICETREE)
+ /* Symlink to the new tree when PROC_DEVICETREE is disabled */
+ if (of_allnodes)
+ proc_symlink("device-tree", NULL, "/sys/firmware/devicetree/base");
+#endif /* CONFIG_PROC_DEVICETREE */
+
+ return 0;
+}
+core_initcall(of_init);
+
static struct property *__of_find_property(const struct device_node *np,
const char *name, int *lenp)
{
raw_spin_lock_irqsave(&devtree_lock, flags);
rc = __of_add_property(np, prop);
raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ if (rc)
+ return rc;
+
+ /* at early boot, bail hear and defer setup to of_init() */
+ if (!of_kset)
+ return 0;
+
+ __of_add_property_sysfs(np, prop);
#ifdef CONFIG_PROC_DEVICETREE
/* try to add to proc as well if it was initialized */
if (!found)
return -ENODEV;
+ /* at early boot, bail hear and defer setup to of_init() */
+ if (!of_kset)
+ return 0;
+
+ sysfs_remove_bin_file(&np->kobj, &prop->attr);
+
#ifdef CONFIG_PROC_DEVICETREE
/* try to remove the proc node as well */
if (np->pde)
next = &(*next)->next;
}
raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ if (rc)
+ return rc;
+
+ /* Update the sysfs attribute */
+ if (oldprop)
+ sysfs_remove_bin_file(&np->kobj, &oldprop->attr);
+ __of_add_property_sysfs(np, newprop);
if (!found)
return -ENODEV;
#ifdef CONFIG_PROC_DEVICETREE
/* try to add to proc as well if it was initialized */
- if (!rc && np->pde)
+ if (np->pde)
proc_device_tree_update_prop(np->pde, newprop, oldprop);
#endif /* CONFIG_PROC_DEVICETREE */
of_node_clear_flag(np, OF_DETACHED);
raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ of_node_add(np);
of_add_proc_dt_entry(np);
return 0;
}
raw_spin_unlock_irqrestore(&devtree_lock, flags);
of_remove_proc_dt_entry(np);
+ of_node_remove(np);
return rc;
}
#endif /* defined(CONFIG_OF_DYNAMIC) */
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