Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Remote processor messaging - sample client driver
4 *
5 * Copyright (C) 2011 Texas Instruments, Inc.
6 * Copyright (C) 2011 Google, Inc.
7 *
8 * Ohad Ben-Cohen <ohad@wizery.com>
9 * Brian Swetland <swetland@google.com>
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/rpmsg.h>
15
16#define MSG "hello world!"
17#define MSG_LIMIT 100
18
19struct instance_data {
20 int rx_count;
21};
22
23static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
24 void *priv, u32 src)
25{
26 int ret;
27 struct instance_data *idata = dev_get_drvdata(&rpdev->dev);
28
29 dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n",
30 ++idata->rx_count, src);
31
32 print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
33 data, len, true);
34
35 /* samples should not live forever */
36 if (idata->rx_count >= MSG_LIMIT) {
37 dev_info(&rpdev->dev, "goodbye!\n");
38 return 0;
39 }
40
41 /* send a new message now */
42 ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
43 if (ret)
44 dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
45
46 return 0;
47}
48
49static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
50{
51 int ret;
52 struct instance_data *idata;
53
54 dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
55 rpdev->src, rpdev->dst);
56
57 idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL);
58 if (!idata)
59 return -ENOMEM;
60
61 dev_set_drvdata(&rpdev->dev, idata);
62
63 /* send a message to our remote processor */
64 ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
65 if (ret) {
66 dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
67 return ret;
68 }
69
70 return 0;
71}
72
73static void rpmsg_sample_remove(struct rpmsg_device *rpdev)
74{
75 dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
76}
77
78static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
79 { .name = "rpmsg-client-sample" },
80 { },
81};
82MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
83
84static struct rpmsg_driver rpmsg_sample_client = {
85 .drv.name = KBUILD_MODNAME,
86 .id_table = rpmsg_driver_sample_id_table,
87 .probe = rpmsg_sample_probe,
88 .callback = rpmsg_sample_cb,
89 .remove = rpmsg_sample_remove,
90};
91module_rpmsg_driver(rpmsg_sample_client);
92
93MODULE_DESCRIPTION("Remote processor messaging sample client driver");
94MODULE_LICENSE("GPL v2");