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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 | { | |
23 | strcpy(rpdev->id.name, "rpmsg_ns"); | |
24 | rpdev->driver_override = "rpmsg_ns"; | |
25 | rpdev->src = RPMSG_NS_ADDR; | |
26 | rpdev->dst = RPMSG_NS_ADDR; | |
27 | ||
28 | return rpmsg_register_device(rpdev); | |
29 | } | |
30 | EXPORT_SYMBOL(rpmsg_ns_register_device); | |
31 | ||
32 | /* invoked when a name service announcement arrives */ | |
33 | static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, | |
34 | void *priv, u32 src) | |
35 | { | |
36 | struct rpmsg_ns_msg *msg = data; | |
37 | struct rpmsg_device *newch; | |
38 | struct rpmsg_channel_info chinfo; | |
39 | struct device *dev = rpdev->dev.parent; | |
40 | int ret; | |
41 | ||
42 | #if defined(CONFIG_DYNAMIC_DEBUG) | |
43 | dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1, | |
44 | data, len, true); | |
45 | #endif | |
46 | ||
47 | if (len != sizeof(*msg)) { | |
48 | dev_err(dev, "malformed ns msg (%d)\n", len); | |
49 | return -EINVAL; | |
50 | } | |
51 | ||
52 | /* don't trust the remote processor for null terminating the name */ | |
53 | msg->name[RPMSG_NAME_SIZE - 1] = '\0'; | |
54 | ||
55 | strncpy(chinfo.name, msg->name, sizeof(chinfo.name)); | |
56 | chinfo.src = RPMSG_ADDR_ANY; | |
57 | chinfo.dst = rpmsg32_to_cpu(rpdev, msg->addr); | |
58 | ||
59 | dev_info(dev, "%sing channel %s addr 0x%x\n", | |
60 | rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY ? | |
61 | "destroy" : "creat", msg->name, chinfo.dst); | |
62 | ||
63 | if (rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY) { | |
64 | ret = rpmsg_release_channel(rpdev, &chinfo); | |
65 | if (ret) | |
66 | dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret); | |
67 | } else { | |
68 | newch = rpmsg_create_channel(rpdev, &chinfo); | |
69 | if (!newch) | |
70 | dev_err(dev, "rpmsg_create_channel failed\n"); | |
71 | } | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static int rpmsg_ns_probe(struct rpmsg_device *rpdev) | |
77 | { | |
78 | struct rpmsg_endpoint *ns_ept; | |
79 | struct rpmsg_channel_info ns_chinfo = { | |
80 | .src = RPMSG_NS_ADDR, | |
81 | .dst = RPMSG_NS_ADDR, | |
82 | .name = "name_service", | |
83 | }; | |
84 | ||
85 | /* | |
86 | * Create the NS announcement service endpoint associated to the RPMsg | |
87 | * device. The endpoint will be automatically destroyed when the RPMsg | |
88 | * device will be deleted. | |
89 | */ | |
90 | ns_ept = rpmsg_create_ept(rpdev, rpmsg_ns_cb, NULL, ns_chinfo); | |
91 | if (!ns_ept) { | |
92 | dev_err(&rpdev->dev, "failed to create the ns ept\n"); | |
93 | return -ENOMEM; | |
94 | } | |
95 | rpdev->ept = ns_ept; | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static struct rpmsg_driver rpmsg_ns_driver = { | |
101 | .drv.name = KBUILD_MODNAME, | |
102 | .probe = rpmsg_ns_probe, | |
103 | }; | |
104 | ||
105 | static int rpmsg_ns_init(void) | |
106 | { | |
107 | int ret; | |
108 | ||
109 | ret = register_rpmsg_driver(&rpmsg_ns_driver); | |
110 | if (ret < 0) | |
111 | pr_err("%s: Failed to register rpmsg driver\n", __func__); | |
112 | ||
113 | return ret; | |
114 | } | |
115 | postcore_initcall(rpmsg_ns_init); | |
116 | ||
117 | static void rpmsg_ns_exit(void) | |
118 | { | |
119 | unregister_rpmsg_driver(&rpmsg_ns_driver); | |
120 | } | |
121 | module_exit(rpmsg_ns_exit); | |
122 | ||
123 | MODULE_DESCRIPTION("Name service announcement rpmsg driver"); | |
124 | MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>"); | |
125 | MODULE_ALIAS("rpmsg:" KBUILD_MODNAME); | |
126 | MODULE_LICENSE("GPL v2"); |