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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) STMicroelectronics 2020 - All Rights Reserved4 */5#include <linux/device.h>6#include <linux/kernel.h>7#include <linux/module.h>8#include <linux/rpmsg.h>9#include <linux/rpmsg/ns.h>10#include <linux/slab.h>11 12#include "rpmsg_internal.h"13 14/**15 * rpmsg_ns_register_device() - register name service device based on rpdev16 * @rpdev: prepared rpdev to be used for creating endpoints17 *18 * This function wraps rpmsg_register_device() preparing the rpdev for use as19 * basis for the rpmsg name service device.20 */21int rpmsg_ns_register_device(struct rpmsg_device *rpdev)22{23 rpdev->src = RPMSG_NS_ADDR;24 rpdev->dst = RPMSG_NS_ADDR;25 26 return rpmsg_register_device_override(rpdev, "rpmsg_ns");27}28EXPORT_SYMBOL(rpmsg_ns_register_device);29 30/* invoked when a name service announcement arrives */31static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,32 void *priv, u32 src)33{34 struct rpmsg_ns_msg *msg = data;35 struct rpmsg_device *newch;36 struct rpmsg_channel_info chinfo;37 struct device *dev = rpdev->dev.parent;38 int ret;39 40#if defined(CONFIG_DYNAMIC_DEBUG)41 dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1,42 data, len, true);43#endif44 45 if (len != sizeof(*msg)) {46 dev_err(dev, "malformed ns msg (%d)\n", len);47 return -EINVAL;48 }49 50 /* don't trust the remote processor for null terminating the name */51 msg->name[RPMSG_NAME_SIZE - 1] = '\0';52 53 strscpy_pad(chinfo.name, msg->name, sizeof(chinfo.name));54 chinfo.src = RPMSG_ADDR_ANY;55 chinfo.dst = rpmsg32_to_cpu(rpdev, msg->addr);56 57 dev_info(dev, "%sing channel %s addr 0x%x\n",58 rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY ?59 "destroy" : "creat", msg->name, chinfo.dst);60 61 if (rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY) {62 ret = rpmsg_release_channel(rpdev, &chinfo);63 if (ret)64 dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);65 } else {66 newch = rpmsg_create_channel(rpdev, &chinfo);67 if (!newch)68 dev_err(dev, "rpmsg_create_channel failed\n");69 }70 71 return 0;72}73 74static int rpmsg_ns_probe(struct rpmsg_device *rpdev)75{76 struct rpmsg_endpoint *ns_ept;77 struct rpmsg_channel_info ns_chinfo = {78 .src = RPMSG_NS_ADDR,79 .dst = RPMSG_NS_ADDR,80 .name = "name_service",81 };82 83 /*84 * Create the NS announcement service endpoint associated to the RPMsg85 * device. The endpoint will be automatically destroyed when the RPMsg86 * device will be deleted.87 */88 ns_ept = rpmsg_create_ept(rpdev, rpmsg_ns_cb, NULL, ns_chinfo);89 if (!ns_ept) {90 dev_err(&rpdev->dev, "failed to create the ns ept\n");91 return -ENOMEM;92 }93 rpdev->ept = ns_ept;94 95 return 0;96}97 98static struct rpmsg_driver rpmsg_ns_driver = {99 .drv.name = KBUILD_MODNAME,100 .probe = rpmsg_ns_probe,101};102 103static int rpmsg_ns_init(void)104{105 int ret;106 107 ret = register_rpmsg_driver(&rpmsg_ns_driver);108 if (ret < 0)109 pr_err("%s: Failed to register rpmsg driver\n", __func__);110 111 return ret;112}113postcore_initcall(rpmsg_ns_init);114 115static void rpmsg_ns_exit(void)116{117 unregister_rpmsg_driver(&rpmsg_ns_driver);118}119module_exit(rpmsg_ns_exit);120 121MODULE_DESCRIPTION("Name service announcement rpmsg driver");122MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");123MODULE_ALIAS("rpmsg:" KBUILD_MODNAME);124MODULE_LICENSE("GPL v2");125