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authorHeikki Krogerus <heikki.krogerus@linux.intel.com>2019-08-19 13:07:22 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-08-26 11:35:13 +0200
commit1666faedb567d03cde1d656ae24c6cc253e67373 (patch)
treee83b326e0893b037bbd41e7f80e95b13c428892f
parenta55aa89aab90fae7c815b0551b07be37db359d76 (diff)
software node: Add software_node_find_by_name()
Function that searches software nodes by node name. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/base/swnode.c37
-rw-r--r--include/linux/property.h4
2 files changed, 41 insertions, 0 deletions
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index e7b3aa3bd55a..ee2a405cca9a 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -620,6 +620,43 @@ static const struct fwnode_operations software_node_ops = {
/* -------------------------------------------------------------------------- */
+/**
+ * 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;
+ 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)
diff --git a/include/linux/property.h b/include/linux/property.h
index 5a910ad79591..9b3d4ca3a73a 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -421,6 +421,10 @@ bool is_software_node(const struct fwnode_handle *fwnode);
const struct software_node *to_software_node(struct fwnode_handle *fwnode);
struct fwnode_handle *software_node_fwnode(const struct software_node *node);
+const struct software_node *
+software_node_find_by_name(const struct software_node *parent,
+ const char *name);
+
int software_node_register_nodes(const struct software_node *nodes);
void software_node_unregister_nodes(const struct software_node *nodes);