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path: root/drivers/rpmsg/rpmsg_ns.c
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Diffstat (limited to 'drivers/rpmsg/rpmsg_ns.c')
-rw-r--r--drivers/rpmsg/rpmsg_ns.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/rpmsg/rpmsg_ns.c b/drivers/rpmsg/rpmsg_ns.c
new file mode 100644
index 000000000000..762ff1ae279f
--- /dev/null
+++ b/drivers/rpmsg/rpmsg_ns.c
@@ -0,0 +1,126 @@
+// 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 <arnaud.pouliquen@st.com>");
+MODULE_ALIAS("rpmsg:" KBUILD_MODNAME);
+MODULE_LICENSE("GPL v2");