+ * rio_add_mport_pw_handler - add port-write message handler into the list
+ * of mport specific pw handlers
+ * @mport: RIO master port to bind the portwrite callback
+ * @context: Handler specific context to pass on event
+ * @pwcback: Callback to execute when portwrite is received
+ *
+ * Returns 0 if the request has been satisfied.
+ */
+int rio_add_mport_pw_handler(struct rio_mport *mport, void *context,
+ int (*pwcback)(struct rio_mport *mport,
+ void *context, union rio_pw_msg *msg, int step))
+{
+ int rc = 0;
+ struct rio_pwrite *pwrite;
+
+ pwrite = kzalloc(sizeof(struct rio_pwrite), GFP_KERNEL);
+ if (!pwrite) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ pwrite->pwcback = pwcback;
+ pwrite->context = context;
+ mutex_lock(&mport->lock);
+ list_add_tail(&pwrite->node, &mport->pwrites);
+ mutex_unlock(&mport->lock);
+out:
+ return rc;
+}
+EXPORT_SYMBOL_GPL(rio_add_mport_pw_handler);
+
+/**
+ * rio_del_mport_pw_handler - remove port-write message handler from the list
+ * of mport specific pw handlers
+ * @mport: RIO master port to bind the portwrite callback
+ * @context: Registered handler specific context to pass on event
+ * @pwcback: Registered callback function
+ *
+ * Returns 0 if the request has been satisfied.
+ */
+int rio_del_mport_pw_handler(struct rio_mport *mport, void *context,
+ int (*pwcback)(struct rio_mport *mport,
+ void *context, union rio_pw_msg *msg, int step))
+{
+ int rc = -EINVAL;
+ struct rio_pwrite *pwrite;
+
+ mutex_lock(&mport->lock);
+ list_for_each_entry(pwrite, &mport->pwrites, node) {
+ if (pwrite->pwcback == pwcback && pwrite->context == context) {
+ list_del(&pwrite->node);
+ kfree(pwrite);
+ rc = 0;
+ break;
+ }
+ }
+ mutex_unlock(&mport->lock);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(rio_del_mport_pw_handler);
+
+/**
+ * rio_request_inb_pwrite - request inbound port-write message service for
+ * specific RapidIO device