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950a7388 AP |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) STMicroelectronics 2020 - All Rights Reserved | |
4 | */ | |
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 rpdev | |
16 | * @rpdev: prepared rpdev to be used for creating endpoints | |
17 | * | |
18 | * This function wraps rpmsg_register_device() preparing the rpdev for use as | |
19 | * basis for the rpmsg name service device. | |
20 | */ | |
21 | int rpmsg_ns_register_device(struct rpmsg_device *rpdev) | |
22 | { | |
950a7388 AP |
23 | rpdev->src = RPMSG_NS_ADDR; |
24 | rpdev->dst = RPMSG_NS_ADDR; | |
25 | ||
bb17d110 | 26 | return rpmsg_register_device_override(rpdev, "rpmsg_ns"); |
950a7388 AP |
27 | } |
28 | EXPORT_SYMBOL(rpmsg_ns_register_device); | |
29 | ||
30 | /* invoked when a name service announcement arrives */ | |
31 | static 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 | #endif | |
44 | ||
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 | strncpy(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 | ||
74 | static 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 RPMsg | |
85 | * device. The endpoint will be automatically destroyed when the RPMsg | |
86 | * 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 | ||
98 | static struct rpmsg_driver rpmsg_ns_driver = { | |
99 | .drv.name = KBUILD_MODNAME, | |
100 | .probe = rpmsg_ns_probe, | |
101 | }; | |
102 | ||
103 | static 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 | } | |
113 | postcore_initcall(rpmsg_ns_init); | |
114 | ||
115 | static void rpmsg_ns_exit(void) | |
116 | { | |
117 | unregister_rpmsg_driver(&rpmsg_ns_driver); | |
118 | } | |
119 | module_exit(rpmsg_ns_exit); | |
120 | ||
121 | MODULE_DESCRIPTION("Name service announcement rpmsg driver"); | |
122 | MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>"); | |
123 | MODULE_ALIAS("rpmsg:" KBUILD_MODNAME); | |
124 | MODULE_LICENSE("GPL v2"); |