blob: 59b13440813d59da2f4fd7869e960da29739c3b9 [file] [log] [blame]
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +02001/*
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
27static 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
50static 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
Greg Kroah-Hartman6ae14172012-12-21 15:16:45 -080067static void rpmsg_sample_remove(struct rpmsg_channel *rpdev)
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020068{
69 dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
70}
71
72static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
73 { .name = "rpmsg-client-sample" },
74 { },
75};
76MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
77
78static 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,
Greg Kroah-Hartman6ae14172012-12-21 15:16:45 -080084 .remove = rpmsg_sample_remove,
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020085};
86
87static int __init rpmsg_client_sample_init(void)
88{
89 return register_rpmsg_driver(&rpmsg_sample_client);
90}
91module_init(rpmsg_client_sample_init);
92
93static void __exit rpmsg_client_sample_fini(void)
94{
95 unregister_rpmsg_driver(&rpmsg_sample_client);
96}
97module_exit(rpmsg_client_sample_fini);
98
99MODULE_DESCRIPTION("Remote processor messaging sample client driver");
100MODULE_LICENSE("GPL v2");