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// 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';
strncpy(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");
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