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1 | /* |
2 | * Remote processor messaging - sample client driver |
3 | * |
4 | * Copyright (C) 2011 Texas Instruments, Inc. |
5 | * Copyright (C) 2011 Google, Inc. |
6 | * |
7 | * Ohad Ben-Cohen <ohad@wizery.com> |
8 | * Brian Swetland <swetland@google.com> |
9 | * |
10 | * This software is licensed under the terms of the GNU General Public |
11 | * License version 2, as published by the Free Software Foundation, and |
12 | * may be copied, distributed, and modified under those terms. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 | * GNU General Public License for more details. |
18 | */ |
19 | |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> |
22 | #include <linux/rpmsg.h> |
23 | |
24 | #define MSG "hello world!" |
25 | #define MSG_LIMIT 100 |
26 | |
27 | static void rpmsg_sample_cb(struct rpmsg_channel *rpdev, void *data, int len, |
28 | void *priv, u32 src) |
29 | { |
30 | int ret; |
31 | static int rx_count; |
32 | |
33 | dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n", ++rx_count, src); |
34 | |
35 | print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1, |
36 | data, len, true); |
37 | |
38 | /* samples should not live forever */ |
39 | if (rx_count >= MSG_LIMIT) { |
40 | dev_info(&rpdev->dev, "goodbye!\n"); |
41 | return; |
42 | } |
43 | |
44 | /* send a new message now */ |
45 | ret = rpmsg_send(rpdev, MSG, strlen(MSG)); |
46 | if (ret) |
47 | dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); |
48 | } |
49 | |
50 | static int rpmsg_sample_probe(struct rpmsg_channel *rpdev) |
51 | { |
52 | int ret; |
53 | |
54 | dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n", |
55 | rpdev->src, rpdev->dst); |
56 | |
57 | /* send a message to our remote processor */ |
58 | ret = rpmsg_send(rpdev, MSG, strlen(MSG)); |
59 | if (ret) { |
60 | dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); |
61 | return ret; |
62 | } |
63 | |
64 | return 0; |
65 | } |
66 | |
67 | static void rpmsg_sample_remove(struct rpmsg_channel *rpdev) |
68 | { |
69 | dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n"); |
70 | } |
71 | |
72 | static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = { |
73 | { .name = "rpmsg-client-sample" }, |
74 | { }, |
75 | }; |
76 | MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table); |
77 | |
78 | static struct rpmsg_driver rpmsg_sample_client = { |
79 | .drv.name = KBUILD_MODNAME, |
80 | .drv.owner = THIS_MODULE, |
81 | .id_table = rpmsg_driver_sample_id_table, |
82 | .probe = rpmsg_sample_probe, |
83 | .callback = rpmsg_sample_cb, |
84 | .remove = rpmsg_sample_remove, |
85 | }; |
86 | |
87 | static int __init rpmsg_client_sample_init(void) |
88 | { |
89 | return register_rpmsg_driver(&rpmsg_sample_client); |
90 | } |
91 | module_init(rpmsg_client_sample_init); |
92 | |
93 | static void __exit rpmsg_client_sample_fini(void) |
94 | { |
95 | unregister_rpmsg_driver(&rpmsg_sample_client); |
96 | } |
97 | module_exit(rpmsg_client_sample_fini); |
98 | |
99 | MODULE_DESCRIPTION("Remote processor messaging sample client driver"); |
100 | MODULE_LICENSE("GPL v2"); |
101 |
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