// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) STMicroelectronics 2020 - All Rights Reserved */#include <linux/device.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/rpmsg.h>#include <linux/rpmsg/ns.h>#include <linux/slab.h> #include "rpmsg_internal.h" /** * rpmsg_ns_register_device() - register name service device based on rpdev * @rpdev: prepared rpdev to be used for creating endpoints * * This function wraps rpmsg_register_device() preparing the rpdev for use as * basis for the rpmsg name service device. */int rpmsg_ns_register_device(struct rpmsg_device *rpdev){	rpdev->src = RPMSG_NS_ADDR;	rpdev->dst = RPMSG_NS_ADDR; 	return rpmsg_register_device_override(rpdev, "rpmsg_ns");}EXPORT_SYMBOL(rpmsg_ns_register_device); /* invoked when a name service announcement arrives */static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,		       void *priv, u32 src){	struct rpmsg_ns_msg *msg = data;	struct rpmsg_device *newch;	struct rpmsg_channel_info chinfo;	struct device *dev = rpdev->dev.parent;	int ret; #if defined(CONFIG_DYNAMIC_DEBUG)	dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1,			 data, len, true);#endif 	if (len != sizeof(*msg)) {		dev_err(dev, "malformed ns msg (%d)\n", len);		return -EINVAL;	} 	/* don't trust the remote processor for null terminating the name */	msg->name[RPMSG_NAME_SIZE - 1] = '\0'; 	strscpy_pad(chinfo.name, msg->name, sizeof(chinfo.name));	chinfo.src = RPMSG_ADDR_ANY;	chinfo.dst = rpmsg32_to_cpu(rpdev, msg->addr); 	dev_info(dev, "%sing channel %s addr 0x%x\n",		 rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY ?		 "destroy" : "creat", msg->name, chinfo.dst); 	if (rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY) {		ret = rpmsg_release_channel(rpdev, &chinfo);		if (ret)			dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);	} else {		newch = rpmsg_create_channel(rpdev, &chinfo);		if (!newch)			dev_err(dev, "rpmsg_create_channel failed\n");	} 	return 0;} static int rpmsg_ns_probe(struct rpmsg_device *rpdev){	struct rpmsg_endpoint *ns_ept;	struct rpmsg_channel_info ns_chinfo = {		.src = RPMSG_NS_ADDR,		.dst = RPMSG_NS_ADDR,		.name = "name_service",	}; 	/*	 * Create the NS announcement service endpoint associated to the RPMsg	 * device. The endpoint will be automatically destroyed when the RPMsg	 * device will be deleted.	 */	ns_ept = rpmsg_create_ept(rpdev, rpmsg_ns_cb, NULL, ns_chinfo);	if (!ns_ept) {		dev_err(&rpdev->dev, "failed to create the ns ept\n");		return -ENOMEM;	}	rpdev->ept = ns_ept; 	return 0;} static struct rpmsg_driver rpmsg_ns_driver = {	.drv.name = KBUILD_MODNAME,	.probe = rpmsg_ns_probe,}; static int rpmsg_ns_init(void){	int ret; 	ret = register_rpmsg_driver(&rpmsg_ns_driver);	if (ret < 0)		pr_err("%s: Failed to register rpmsg driver\n", __func__); 	return ret;}postcore_initcall(rpmsg_ns_init); static void rpmsg_ns_exit(void){	unregister_rpmsg_driver(&rpmsg_ns_driver);}module_exit(rpmsg_ns_exit); MODULE_DESCRIPTION("Name service announcement rpmsg driver");MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");MODULE_ALIAS("rpmsg:" KBUILD_MODNAME);MODULE_LICENSE("GPL v2");