Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Software nodes for the firmware node framework.
 *
 * Copyright (C) 2018, Intel Corporation
 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
 */
 
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/property.h>
#include <linux/slab.h>
 
struct swnode {
<------>int id;
<------>struct kobject kobj;
<------>struct fwnode_handle fwnode;
<------>const struct software_node *node;
 
<------>/* hierarchy */
<------>struct ida child_ids;
<------>struct list_head entry;
<------>struct list_head children;
<------>struct swnode *parent;
 
<------>unsigned int allocated:1;
};
 
static DEFINE_IDA(swnode_root_ids);
static struct kset *swnode_kset;
 
#define kobj_to_swnode(_kobj_) container_of(_kobj_, struct swnode, kobj)
 
static const struct fwnode_operations software_node_ops;
 
bool is_software_node(const struct fwnode_handle *fwnode)
{
<------>return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &software_node_ops;
}
EXPORT_SYMBOL_GPL(is_software_node);
 
#define to_swnode(__fwnode)						\
<------>({								\
<------><------>typeof(__fwnode) __to_swnode_fwnode = __fwnode;		\
<------><------><------><------><------><------><------><------><------>\
<------><------>is_software_node(__to_swnode_fwnode) ?			\
<------><------><------>container_of(__to_swnode_fwnode,		\
<------><------><------><------>     struct swnode, fwnode) : NULL;	\
<------>})
 
static inline struct swnode *dev_to_swnode(struct device *dev)
{
<------>struct fwnode_handle *fwnode = dev_fwnode(dev);
 
<------>if (!fwnode)
<------><------>return NULL;
 
<------>if (!is_software_node(fwnode))
<------><------>fwnode = fwnode->secondary;
 
<------>return to_swnode(fwnode);
}
 
static struct swnode *
software_node_to_swnode(const struct software_node *node)
{
<------>struct swnode *swnode = NULL;
<------>struct kobject *k;
 
<------>if (!node)
<------><------>return NULL;
 
<------>spin_lock(&swnode_kset->list_lock);
 
<------>list_for_each_entry(k, &swnode_kset->list, entry) {
<------><------>swnode = kobj_to_swnode(k);
<------><------>if (swnode->node == node)
<------><------><------>break;
<------><------>swnode = NULL;
<------>}
 
<------>spin_unlock(&swnode_kset->list_lock);
 
<------>return swnode;
}
 
const struct software_node *to_software_node(const struct fwnode_handle *fwnode)
{
<------>const struct swnode *swnode = to_swnode(fwnode);
 
<------>return swnode ? swnode->node : NULL;
}
EXPORT_SYMBOL_GPL(to_software_node);
 
struct fwnode_handle *software_node_fwnode(const struct software_node *node)
{
<------>struct swnode *swnode = software_node_to_swnode(node);
 
<------>return swnode ? &swnode->fwnode : NULL;
}
EXPORT_SYMBOL_GPL(software_node_fwnode);
 
/* -------------------------------------------------------------------------- */
/* property_entry processing */
 
static const struct property_entry *
property_entry_get(const struct property_entry *prop, const char *name)
{
<------>if (!prop)
<------><------>return NULL;
 
<------>for (; prop->name; prop++)
<------><------>if (!strcmp(name, prop->name))
<------><------><------>return prop;
 
<------>return NULL;
}
 
static const void *property_get_pointer(const struct property_entry *prop)
{
<------>if (!prop->length)
<------><------>return NULL;
 
<------>return prop->is_inline ? &prop->value : prop->pointer;
}
 
static const void *property_entry_find(const struct property_entry *props,
<------><------><------><------>       const char *propname, size_t length)
{
<------>const struct property_entry *prop;
<------>const void *pointer;
 
<------>prop = property_entry_get(props, propname);
<------>if (!prop)
<------><------>return ERR_PTR(-EINVAL);
<------>pointer = property_get_pointer(prop);
<------>if (!pointer)
<------><------>return ERR_PTR(-ENODATA);
<------>if (length > prop->length)
<------><------>return ERR_PTR(-EOVERFLOW);
<------>return pointer;
}
 
static int
property_entry_count_elems_of_size(const struct property_entry *props,
<------><------><------><------>   const char *propname, size_t length)
{
<------>const struct property_entry *prop;
 
<------>prop = property_entry_get(props, propname);
<------>if (!prop)
<------><------>return -EINVAL;
 
<------>return prop->length / length;
}
 
static int property_entry_read_int_array(const struct property_entry *props,
<------><------><------><------><------> const char *name,
<------><------><------><------><------> unsigned int elem_size, void *val,
<------><------><------><------><------> size_t nval)
{
<------>const void *pointer;
<------>size_t length;
 
<------>if (!val)
<------><------>return property_entry_count_elems_of_size(props, name,
<------><------><------><------><------><------><------>  elem_size);
 
<------>if (!is_power_of_2(elem_size) || elem_size > sizeof(u64))
<------><------>return -ENXIO;
 
<------>length = nval * elem_size;
 
<------>pointer = property_entry_find(props, name, length);
<------>if (IS_ERR(pointer))
<------><------>return PTR_ERR(pointer);
 
<------>memcpy(val, pointer, length);
<------>return 0;
}
 
static int property_entry_read_string_array(const struct property_entry *props,
<------><------><------><------><------>    const char *propname,
<------><------><------><------><------>    const char **strings, size_t nval)
{
<------>const void *pointer;
<------>size_t length;
<------>int array_len;
 
<------>/* Find out the array length. */
<------>array_len = property_entry_count_elems_of_size(props, propname,
<------><------><------><------><------><------>       sizeof(const char *));
<------>if (array_len < 0)
<------><------>return array_len;
 
<------>/* Return how many there are if strings is NULL. */
<------>if (!strings)
<------><------>return array_len;
 
<------>array_len = min_t(size_t, nval, array_len);
<------>length = array_len * sizeof(*strings);
 
<------>pointer = property_entry_find(props, propname, length);
<------>if (IS_ERR(pointer))
<------><------>return PTR_ERR(pointer);
 
<------>memcpy(strings, pointer, length);
 
<------>return array_len;
}
 
static void property_entry_free_data(const struct property_entry *p)
{
<------>const char * const *src_str;
<------>size_t i, nval;
 
<------>if (p->type == DEV_PROP_STRING) {
<------><------>src_str = property_get_pointer(p);
<------><------>nval = p->length / sizeof(*src_str);
<------><------>for (i = 0; i < nval; i++)
<------><------><------>kfree(src_str[i]);
<------>}
 
<------>if (!p->is_inline)
<------><------>kfree(p->pointer);
 
<------>kfree(p->name);
}
 
static bool property_copy_string_array(const char **dst_ptr,
<------><------><------><------>       const char * const *src_ptr,
<------><------><------><------>       size_t nval)
{
<------>int i;
 
<------>for (i = 0; i < nval; i++) {
<------><------>dst_ptr[i] = kstrdup(src_ptr[i], GFP_KERNEL);
<------><------>if (!dst_ptr[i] && src_ptr[i]) {
<------><------><------>while (--i >= 0)
<------><------><------><------>kfree(dst_ptr[i]);
<------><------><------>return false;
<------><------>}
<------>}
 
<------>return true;
}
 
static int property_entry_copy_data(struct property_entry *dst,
<------><------><------><------>    const struct property_entry *src)
{
<------>const void *pointer = property_get_pointer(src);
<------>void *dst_ptr;
<------>size_t nval;
 
<------>/*
<------> * Properties with no data should not be marked as stored
<------> * out of line.
<------> */
<------>if (!src->is_inline && !src->length)
<------><------>return -ENODATA;
 
<------>/*
<------> * Reference properties are never stored inline as
<------> * they are too big.
<------> */
<------>if (src->type == DEV_PROP_REF && src->is_inline)
<------><------>return -EINVAL;
 
<------>if (src->length <= sizeof(dst->value)) {
<------><------>dst_ptr = &dst->value;
<------><------>dst->is_inline = true;
<------>} else {
<------><------>dst_ptr = kmalloc(src->length, GFP_KERNEL);
<------><------>if (!dst_ptr)
<------><------><------>return -ENOMEM;
<------><------>dst->pointer = dst_ptr;
<------>}
 
<------>if (src->type == DEV_PROP_STRING) {
<------><------>nval = src->length / sizeof(const char *);
<------><------>if (!property_copy_string_array(dst_ptr, pointer, nval)) {
<------><------><------>if (!dst->is_inline)
<------><------><------><------>kfree(dst->pointer);
<------><------><------>return -ENOMEM;
<------><------>}
<------>} else {
<------><------>memcpy(dst_ptr, pointer, src->length);
<------>}
 
<------>dst->length = src->length;
<------>dst->type = src->type;
<------>dst->name = kstrdup(src->name, GFP_KERNEL);
<------>if (!dst->name) {
<------><------>property_entry_free_data(dst);
<------><------>return -ENOMEM;
<------>}
 
<------>return 0;
}
 
/**
 * property_entries_dup - duplicate array of properties
 * @properties: array of properties to copy
 *
 * This function creates a deep copy of the given NULL-terminated array
 * of property entries.
 */
struct property_entry *
property_entries_dup(const struct property_entry *properties)
{
<------>struct property_entry *p;
<------>int i, n = 0;
<------>int ret;
 
<------>if (!properties)
<------><------>return NULL;
 
<------>while (properties[n].name)
<------><------>n++;
 
<------>p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
<------>if (!p)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>for (i = 0; i < n; i++) {
<------><------>ret = property_entry_copy_data(&p[i], &properties[i]);
<------><------>if (ret) {
<------><------><------>while (--i >= 0)
<------><------><------><------>property_entry_free_data(&p[i]);
<------><------><------>kfree(p);
<------><------><------>return ERR_PTR(ret);
<------><------>}
<------>}
 
<------>return p;
}
EXPORT_SYMBOL_GPL(property_entries_dup);
 
/**
 * property_entries_free - free previously allocated array of properties
 * @properties: array of properties to destroy
 *
 * This function frees given NULL-terminated array of property entries,
 * along with their data.
 */
void property_entries_free(const struct property_entry *properties)
{
<------>const struct property_entry *p;
 
<------>if (!properties)
<------><------>return;
 
<------>for (p = properties; p->name; p++)
<------><------>property_entry_free_data(p);
 
<------>kfree(properties);
}
EXPORT_SYMBOL_GPL(property_entries_free);
 
/* -------------------------------------------------------------------------- */
/* fwnode operations */
 
static struct fwnode_handle *software_node_get(struct fwnode_handle *fwnode)
{
<------>struct swnode *swnode = to_swnode(fwnode);
 
<------>kobject_get(&swnode->kobj);
 
<------>return &swnode->fwnode;
}
 
static void software_node_put(struct fwnode_handle *fwnode)
{
<------>struct swnode *swnode = to_swnode(fwnode);
 
<------>kobject_put(&swnode->kobj);
}
 
static bool software_node_property_present(const struct fwnode_handle *fwnode,
<------><------><------><------><------>   const char *propname)
{
<------>struct swnode *swnode = to_swnode(fwnode);
 
<------>return !!property_entry_get(swnode->node->properties, propname);
}
 
static int software_node_read_int_array(const struct fwnode_handle *fwnode,
<------><------><------><------><------>const char *propname,
<------><------><------><------><------>unsigned int elem_size, void *val,
<------><------><------><------><------>size_t nval)
{
<------>struct swnode *swnode = to_swnode(fwnode);
 
<------>return property_entry_read_int_array(swnode->node->properties, propname,
<------><------><------><------><------>     elem_size, val, nval);
}
 
static int software_node_read_string_array(const struct fwnode_handle *fwnode,
<------><------><------><------><------>   const char *propname,
<------><------><------><------><------>   const char **val, size_t nval)
{
<------>struct swnode *swnode = to_swnode(fwnode);
 
<------>return property_entry_read_string_array(swnode->node->properties,
<------><------><------><------><------><------>propname, val, nval);
}
 
static const char *
software_node_get_name(const struct fwnode_handle *fwnode)
{
<------>const struct swnode *swnode = to_swnode(fwnode);
 
<------>if (!swnode)
<------><------>return "(null)";
 
<------>return kobject_name(&swnode->kobj);
}
 
static const char *
software_node_get_name_prefix(const struct fwnode_handle *fwnode)
{
<------>struct fwnode_handle *parent;
<------>const char *prefix;
 
<------>parent = fwnode_get_parent(fwnode);
<------>if (!parent)
<------><------>return "";
 
<------>/* Figure out the prefix from the parents. */
<------>while (is_software_node(parent))
<------><------>parent = fwnode_get_next_parent(parent);
 
<------>prefix = fwnode_get_name_prefix(parent);
<------>fwnode_handle_put(parent);
 
<------>/* Guess something if prefix was NULL. */
<------>return prefix ?: "/";
}
 
static struct fwnode_handle *
software_node_get_parent(const struct fwnode_handle *fwnode)
{
<------>struct swnode *swnode = to_swnode(fwnode);
 
<------>if (!swnode || !swnode->parent)
<------><------>return NULL;
 
<------>return fwnode_handle_get(&swnode->parent->fwnode);
}
 
static struct fwnode_handle *
software_node_get_next_child(const struct fwnode_handle *fwnode,
<------><------><------>     struct fwnode_handle *child)
{
<------>struct swnode *p = to_swnode(fwnode);
<------>struct swnode *c = to_swnode(child);
 
<------>if (!p || list_empty(&p->children) ||
<------>    (c && list_is_last(&c->entry, &p->children))) {
<------><------>fwnode_handle_put(child);
<------><------>return NULL;
<------>}
 
<------>if (c)
<------><------>c = list_next_entry(c, entry);
<------>else
<------><------>c = list_first_entry(&p->children, struct swnode, entry);
 
<------>fwnode_handle_put(child);
<------>return fwnode_handle_get(&c->fwnode);
}
 
static struct fwnode_handle *
software_node_get_named_child_node(const struct fwnode_handle *fwnode,
<------><------><------><------>   const char *childname)
{
<------>struct swnode *swnode = to_swnode(fwnode);
<------>struct swnode *child;
 
<------>if (!swnode || list_empty(&swnode->children))
<------><------>return NULL;
 
<------>list_for_each_entry(child, &swnode->children, entry) {
<------><------>if (!strcmp(childname, kobject_name(&child->kobj))) {
<------><------><------>kobject_get(&child->kobj);
<------><------><------>return &child->fwnode;
<------><------>}
<------>}
<------>return NULL;
}
 
static int
software_node_get_reference_args(const struct fwnode_handle *fwnode,
<------><------><------><------> const char *propname, const char *nargs_prop,
<------><------><------><------> unsigned int nargs, unsigned int index,
<------><------><------><------> struct fwnode_reference_args *args)
{
<------>struct swnode *swnode = to_swnode(fwnode);
<------>const struct software_node_ref_args *ref_array;
<------>const struct software_node_ref_args *ref;
<------>const struct property_entry *prop;
<------>struct fwnode_handle *refnode;
<------>u32 nargs_prop_val;
<------>int error;
<------>int i;
 
<------>if (!swnode)
<------><------>return -ENOENT;
 
<------>prop = property_entry_get(swnode->node->properties, propname);
<------>if (!prop)
<------><------>return -ENOENT;
 
<------>if (prop->type != DEV_PROP_REF)
<------><------>return -EINVAL;
 
<------>/*
<------> * We expect that references are never stored inline, even
<------> * single ones, as they are too big.
<------> */
<------>if (prop->is_inline)
<------><------>return -EINVAL;
 
<------>if (index * sizeof(*ref) >= prop->length)
<------><------>return -ENOENT;
 
<------>ref_array = prop->pointer;
<------>ref = &ref_array[index];
 
<------>refnode = software_node_fwnode(ref->node);
<------>if (!refnode)
<------><------>return -ENOENT;
 
<------>if (nargs_prop) {
<------><------>error = property_entry_read_int_array(ref->node->properties,
<------><------><------><------><------><------>      nargs_prop, sizeof(u32),
<------><------><------><------><------><------>      &nargs_prop_val, 1);
<------><------>if (error)
<------><------><------>return error;
 
<------><------>nargs = nargs_prop_val;
<------>}
 
<------>if (nargs > NR_FWNODE_REFERENCE_ARGS)
<------><------>return -EINVAL;
 
<------>args->fwnode = software_node_get(refnode);
<------>args->nargs = nargs;
 
<------>for (i = 0; i < nargs; i++)
<------><------>args->args[i] = ref->args[i];
 
<------>return 0;
}
 
static const struct fwnode_operations software_node_ops = {
<------>.get = software_node_get,
<------>.put = software_node_put,
<------>.property_present = software_node_property_present,
<------>.property_read_int_array = software_node_read_int_array,
<------>.property_read_string_array = software_node_read_string_array,
<------>.get_name = software_node_get_name,
<------>.get_name_prefix = software_node_get_name_prefix,
<------>.get_parent = software_node_get_parent,
<------>.get_next_child_node = software_node_get_next_child,
<------>.get_named_child_node = software_node_get_named_child_node,
<------>.get_reference_args = software_node_get_reference_args
};
 
/* -------------------------------------------------------------------------- */
 
/**
 * software_node_find_by_name - Find software node by name
 * @parent: Parent of the software node
 * @name: Name of the software node
 *
 * The function will find a node that is child of @parent and that is named
 * @name. If no node is found, the function returns NULL.
 *
 * NOTE: you will need to drop the reference with fwnode_handle_put() after use.
 */
const struct software_node *
software_node_find_by_name(const struct software_node *parent, const char *name)
{
<------>struct swnode *swnode = NULL;
<------>struct kobject *k;
 
<------>if (!name)
<------><------>return NULL;
 
<------>spin_lock(&swnode_kset->list_lock);
 
<------>list_for_each_entry(k, &swnode_kset->list, entry) {
<------><------>swnode = kobj_to_swnode(k);
<------><------>if (parent == swnode->node->parent && swnode->node->name &&
<------><------>    !strcmp(name, swnode->node->name)) {
<------><------><------>kobject_get(&swnode->kobj);
<------><------><------>break;
<------><------>}
<------><------>swnode = NULL;
<------>}
 
<------>spin_unlock(&swnode_kset->list_lock);
 
<------>return swnode ? swnode->node : NULL;
}
EXPORT_SYMBOL_GPL(software_node_find_by_name);
 
static int
software_node_register_properties(struct software_node *node,
<------><------><------><------>  const struct property_entry *properties)
{
<------>struct property_entry *props;
 
<------>props = property_entries_dup(properties);
<------>if (IS_ERR(props))
<------><------>return PTR_ERR(props);
 
<------>node->properties = props;
 
<------>return 0;
}
 
static void software_node_release(struct kobject *kobj)
{
<------>struct swnode *swnode = kobj_to_swnode(kobj);
 
<------>if (swnode->parent) {
<------><------>ida_simple_remove(&swnode->parent->child_ids, swnode->id);
<------><------>list_del(&swnode->entry);
<------>} else {
<------><------>ida_simple_remove(&swnode_root_ids, swnode->id);
<------>}
 
<------>if (swnode->allocated) {
<------><------>property_entries_free(swnode->node->properties);
<------><------>kfree(swnode->node);
<------>}
<------>ida_destroy(&swnode->child_ids);
<------>kfree(swnode);
}
 
static struct kobj_type software_node_type = {
<------>.release = software_node_release,
<------>.sysfs_ops = &kobj_sysfs_ops,
};
 
static struct fwnode_handle *
swnode_register(const struct software_node *node, struct swnode *parent,
<------><------>unsigned int allocated)
{
<------>struct swnode *swnode;
<------>int ret;
 
<------>swnode = kzalloc(sizeof(*swnode), GFP_KERNEL);
<------>if (!swnode) {
<------><------>ret = -ENOMEM;
<------><------>goto out_err;
<------>}
 
<------>ret = ida_simple_get(parent ? &parent->child_ids : &swnode_root_ids,
<------><------><------>     0, 0, GFP_KERNEL);
<------>if (ret < 0) {
<------><------>kfree(swnode);
<------><------>goto out_err;
<------>}
 
<------>swnode->id = ret;
<------>swnode->node = node;
<------>swnode->parent = parent;
<------>swnode->allocated = allocated;
<------>swnode->kobj.kset = swnode_kset;
<------>fwnode_init(&swnode->fwnode, &software_node_ops);
 
<------>ida_init(&swnode->child_ids);
<------>INIT_LIST_HEAD(&swnode->entry);
<------>INIT_LIST_HEAD(&swnode->children);
 
<------>if (node->name)
<------><------>ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
<------><------><------><------><------>   parent ? &parent->kobj : NULL,
<------><------><------><------><------>   "%s", node->name);
<------>else
<------><------>ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
<------><------><------><------><------>   parent ? &parent->kobj : NULL,
<------><------><------><------><------>   "node%d", swnode->id);
<------>if (ret) {
<------><------>kobject_put(&swnode->kobj);
<------><------>return ERR_PTR(ret);
<------>}
 
<------>if (parent)
<------><------>list_add_tail(&swnode->entry, &parent->children);
 
<------>kobject_uevent(&swnode->kobj, KOBJ_ADD);
<------>return &swnode->fwnode;
 
out_err:
<------>if (allocated)
<------><------>property_entries_free(node->properties);
<------>return ERR_PTR(ret);
}
 
/**
 * software_node_register_nodes - Register an array of software nodes
 * @nodes: Zero terminated array of software nodes to be registered
 *
 * Register multiple software nodes at once.
 */
int software_node_register_nodes(const struct software_node *nodes)
{
<------>int ret;
<------>int i;
 
<------>for (i = 0; nodes[i].name; i++) {
<------><------>ret = software_node_register(&nodes[i]);
<------><------>if (ret) {
<------><------><------>software_node_unregister_nodes(nodes);
<------><------><------>return ret;
<------><------>}
<------>}
 
<------>return 0;
}
EXPORT_SYMBOL_GPL(software_node_register_nodes);
 
/**
 * software_node_unregister_nodes - Unregister an array of software nodes
 * @nodes: Zero terminated array of software nodes to be unregistered
 *
 * Unregister multiple software nodes at once.
 *
 * NOTE: Be careful using this call if the nodes had parent pointers set up in
 * them before registering.  If so, it is wiser to remove the nodes
 * individually, in the correct order (child before parent) instead of relying
 * on the sequential order of the list of nodes in the array.
 */
void software_node_unregister_nodes(const struct software_node *nodes)
{
<------>int i;
 
<------>for (i = 0; nodes[i].name; i++)
<------><------>software_node_unregister(&nodes[i]);
}
EXPORT_SYMBOL_GPL(software_node_unregister_nodes);
 
/**
 * software_node_register_node_group - Register a group of software nodes
 * @node_group: NULL terminated array of software node pointers to be registered
 *
 * Register multiple software nodes at once.
 */
int software_node_register_node_group(const struct software_node **node_group)
{
<------>unsigned int i;
<------>int ret;
 
<------>if (!node_group)
<------><------>return 0;
 
<------>for (i = 0; node_group[i]; i++) {
<------><------>ret = software_node_register(node_group[i]);
<------><------>if (ret) {
<------><------><------>software_node_unregister_node_group(node_group);
<------><------><------>return ret;
<------><------>}
<------>}
 
<------>return 0;
}
EXPORT_SYMBOL_GPL(software_node_register_node_group);
 
/**
 * software_node_unregister_node_group - Unregister a group of software nodes
 * @node_group: NULL terminated array of software node pointers to be unregistered
 *
 * Unregister multiple software nodes at once.
 */
void software_node_unregister_node_group(const struct software_node **node_group)
{
<------>unsigned int i;
 
<------>if (!node_group)
<------><------>return;
 
<------>for (i = 0; node_group[i]; i++)
<------><------>software_node_unregister(node_group[i]);
}
EXPORT_SYMBOL_GPL(software_node_unregister_node_group);
 
/**
 * software_node_register - Register static software node
 * @node: The software node to be registered
 */
int software_node_register(const struct software_node *node)
{
<------>struct swnode *parent = software_node_to_swnode(node->parent);
 
<------>if (software_node_to_swnode(node))
<------><------>return -EEXIST;
 
<------>if (node->parent && !parent)
<------><------>return -EINVAL;
 
<------>return PTR_ERR_OR_ZERO(swnode_register(node, parent, 0));
}
EXPORT_SYMBOL_GPL(software_node_register);
 
/**
 * software_node_unregister - Unregister static software node
 * @node: The software node to be unregistered
 */
void software_node_unregister(const struct software_node *node)
{
<------>struct swnode *swnode;
 
<------>swnode = software_node_to_swnode(node);
<------>if (swnode)
<------><------>fwnode_remove_software_node(&swnode->fwnode);
}
EXPORT_SYMBOL_GPL(software_node_unregister);
 
struct fwnode_handle *
fwnode_create_software_node(const struct property_entry *properties,
<------><------><------>    const struct fwnode_handle *parent)
{
<------>struct software_node *node;
<------>struct swnode *p = NULL;
<------>int ret;
 
<------>if (parent) {
<------><------>if (IS_ERR(parent))
<------><------><------>return ERR_CAST(parent);
<------><------>if (!is_software_node(parent))
<------><------><------>return ERR_PTR(-EINVAL);
<------><------>p = to_swnode(parent);
<------>}
 
<------>node = kzalloc(sizeof(*node), GFP_KERNEL);
<------>if (!node)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>ret = software_node_register_properties(node, properties);
<------>if (ret) {
<------><------>kfree(node);
<------><------>return ERR_PTR(ret);
<------>}
 
<------>node->parent = p ? p->node : NULL;
 
<------>return swnode_register(node, p, 1);
}
EXPORT_SYMBOL_GPL(fwnode_create_software_node);
 
void fwnode_remove_software_node(struct fwnode_handle *fwnode)
{
<------>struct swnode *swnode = to_swnode(fwnode);
 
<------>if (!swnode)
<------><------>return;
 
<------>kobject_put(&swnode->kobj);
}
EXPORT_SYMBOL_GPL(fwnode_remove_software_node);
 
/**
 * device_add_software_node - Assign software node to a device
 * @dev: The device the software node is meant for.
 * @node: The software node.
 *
 * This function will make @node the secondary firmware node pointer of @dev. If
 * @dev has no primary node, then @node will become the primary node. The
 * function will register @node automatically if it wasn't already registered.
 */
int device_add_software_node(struct device *dev, const struct software_node *node)
{
<------>struct swnode *swnode;
<------>int ret;
 
<------>/* Only one software node per device. */
<------>if (dev_to_swnode(dev))
<------><------>return -EBUSY;
 
<------>swnode = software_node_to_swnode(node);
<------>if (swnode) {
<------><------>kobject_get(&swnode->kobj);
<------>} else {
<------><------>ret = software_node_register(node);
<------><------>if (ret)
<------><------><------>return ret;
 
<------><------>swnode = software_node_to_swnode(node);
<------>}
 
<------>set_secondary_fwnode(dev, &swnode->fwnode);
 
<------>/*
<------> * If the device has been fully registered by the time this function is
<------> * called, software_node_notify() must be called separately so that the
<------> * symlinks get created and the reference count of the node is kept in
<------> * balance.
<------> */
<------>if (device_is_registered(dev))
<------><------>software_node_notify(dev, KOBJ_ADD);
 
<------>return 0;
}
EXPORT_SYMBOL_GPL(device_add_software_node);
 
/**
 * device_remove_software_node - Remove device's software node
 * @dev: The device with the software node.
 *
 * This function will unregister the software node of @dev.
 */
void device_remove_software_node(struct device *dev)
{
<------>struct swnode *swnode;
 
<------>swnode = dev_to_swnode(dev);
<------>if (!swnode)
<------><------>return;
 
<------>if (device_is_registered(dev))
<------><------>software_node_notify(dev, KOBJ_REMOVE);
<------>set_secondary_fwnode(dev, NULL);
<------>kobject_put(&swnode->kobj);
}
EXPORT_SYMBOL_GPL(device_remove_software_node);
 
int software_node_notify(struct device *dev, unsigned long action)
{
<------>struct swnode *swnode;
<------>int ret;
 
<------>swnode = dev_to_swnode(dev);
<------>if (!swnode)
<------><------>return 0;
 
<------>switch (action) {
<------>case KOBJ_ADD:
<------><------>ret = sysfs_create_link(&dev->kobj, &swnode->kobj, "software_node");
<------><------>if (ret)
<------><------><------>break;
 
<------><------>ret = sysfs_create_link(&swnode->kobj, &dev->kobj,
<------><------><------><------><------>dev_name(dev));
<------><------>if (ret) {
<------><------><------>sysfs_remove_link(&dev->kobj, "software_node");
<------><------><------>break;
<------><------>}
<------><------>kobject_get(&swnode->kobj);
<------><------>break;
<------>case KOBJ_REMOVE:
<------><------>sysfs_remove_link(&swnode->kobj, dev_name(dev));
<------><------>sysfs_remove_link(&dev->kobj, "software_node");
<------><------>kobject_put(&swnode->kobj);
<------><------>break;
<------>default:
<------><------>break;
<------>}
 
<------>return 0;
}
 
static int __init software_node_init(void)
{
<------>swnode_kset = kset_create_and_add("software_nodes", NULL, kernel_kobj);
<------>if (!swnode_kset)
<------><------>return -ENOMEM;
<------>return 0;
}
postcore_initcall(software_node_init);
 
static void __exit software_node_exit(void)
{
<------>ida_destroy(&swnode_root_ids);
<------>kset_unregister(swnode_kset);
}
__exitcall(software_node_exit);