forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
3.2 KiB
126 lines
3.2 KiB
// 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) |
|
{ |
|
strcpy(rpdev->id.name, "rpmsg_ns"); |
|
rpdev->driver_override = "rpmsg_ns"; |
|
rpdev->src = RPMSG_NS_ADDR; |
|
rpdev->dst = RPMSG_NS_ADDR; |
|
|
|
return rpmsg_register_device(rpdev); |
|
} |
|
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 <[email protected]>"); |
|
MODULE_ALIAS("rpmsg:" KBUILD_MODNAME); |
|
MODULE_LICENSE("GPL v2");
|
|
|