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779b96d2 OBC |
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 | ||
6ae14171 | 67 | static void rpmsg_sample_remove(struct rpmsg_channel *rpdev) |
779b96d2 OBC |
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, | |
6ae14171 | 84 | .remove = rpmsg_sample_remove, |
779b96d2 OBC |
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"); |