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
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
67static void rpmsg_sample_remove(struct rpmsg_channel *rpdev)
68{
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,
84	.remove		= rpmsg_sample_remove,
85};
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");
101