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 | |
18 | static int count = 100; |
19 | module_param(count, int, 0644); |
20 | |
21 | struct instance_data { |
22 | int rx_count; |
23 | }; |
24 | |
25 | static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len, |
26 | void *priv, u32 src) |
27 | { |
28 | int ret; |
29 | struct instance_data *idata = dev_get_drvdata(dev: &rpdev->dev); |
30 | |
31 | dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n" , |
32 | ++idata->rx_count, src); |
33 | |
34 | print_hex_dump_debug(__func__, DUMP_PREFIX_NONE, 16, 1, data, len, |
35 | true); |
36 | |
37 | /* samples should not live forever */ |
38 | if (idata->rx_count >= count) { |
39 | dev_info(&rpdev->dev, "goodbye!\n" ); |
40 | return 0; |
41 | } |
42 | |
43 | /* send a new message now */ |
44 | ret = rpmsg_send(ept: rpdev->ept, MSG, strlen(MSG)); |
45 | if (ret) |
46 | dev_err(&rpdev->dev, "rpmsg_send failed: %d\n" , ret); |
47 | |
48 | return 0; |
49 | } |
50 | |
51 | static int rpmsg_sample_probe(struct rpmsg_device *rpdev) |
52 | { |
53 | int ret; |
54 | struct instance_data *idata; |
55 | |
56 | dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n" , |
57 | rpdev->src, rpdev->dst); |
58 | |
59 | idata = devm_kzalloc(dev: &rpdev->dev, size: sizeof(*idata), GFP_KERNEL); |
60 | if (!idata) |
61 | return -ENOMEM; |
62 | |
63 | dev_set_drvdata(dev: &rpdev->dev, data: idata); |
64 | |
65 | /* send a message to our remote processor */ |
66 | ret = rpmsg_send(ept: rpdev->ept, MSG, strlen(MSG)); |
67 | if (ret) { |
68 | dev_err(&rpdev->dev, "rpmsg_send failed: %d\n" , ret); |
69 | return ret; |
70 | } |
71 | |
72 | return 0; |
73 | } |
74 | |
75 | static void rpmsg_sample_remove(struct rpmsg_device *rpdev) |
76 | { |
77 | dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n" ); |
78 | } |
79 | |
80 | static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = { |
81 | { .name = "rpmsg-client-sample" }, |
82 | { }, |
83 | }; |
84 | MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table); |
85 | |
86 | static struct rpmsg_driver rpmsg_sample_client = { |
87 | .drv.name = KBUILD_MODNAME, |
88 | .id_table = rpmsg_driver_sample_id_table, |
89 | .probe = rpmsg_sample_probe, |
90 | .callback = rpmsg_sample_cb, |
91 | .remove = rpmsg_sample_remove, |
92 | }; |
93 | module_rpmsg_driver(rpmsg_sample_client); |
94 | |
95 | MODULE_DESCRIPTION("Remote processor messaging sample client driver" ); |
96 | MODULE_LICENSE("GPL v2" ); |
97 | |