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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 | ||
a138c883 AS |
27 | struct instance_data { |
28 | int rx_count; | |
29 | }; | |
30 | ||
4b83c52a | 31 | static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len, |
779b96d2 OBC |
32 | void *priv, u32 src) |
33 | { | |
34 | int ret; | |
a138c883 | 35 | struct instance_data *idata = dev_get_drvdata(&rpdev->dev); |
779b96d2 | 36 | |
a138c883 AS |
37 | dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n", |
38 | ++idata->rx_count, src); | |
779b96d2 OBC |
39 | |
40 | print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1, | |
41 | data, len, true); | |
42 | ||
43 | /* samples should not live forever */ | |
a138c883 | 44 | if (idata->rx_count >= MSG_LIMIT) { |
779b96d2 | 45 | dev_info(&rpdev->dev, "goodbye!\n"); |
4b83c52a | 46 | return 0; |
779b96d2 OBC |
47 | } |
48 | ||
49 | /* send a new message now */ | |
2a48d732 | 50 | ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG)); |
779b96d2 OBC |
51 | if (ret) |
52 | dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); | |
4b83c52a BA |
53 | |
54 | return 0; | |
779b96d2 OBC |
55 | } |
56 | ||
92e1de51 | 57 | static int rpmsg_sample_probe(struct rpmsg_device *rpdev) |
779b96d2 OBC |
58 | { |
59 | int ret; | |
a138c883 | 60 | struct instance_data *idata; |
779b96d2 OBC |
61 | |
62 | dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n", | |
63 | rpdev->src, rpdev->dst); | |
64 | ||
a138c883 AS |
65 | idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL); |
66 | if (!idata) | |
67 | return -ENOMEM; | |
68 | ||
69 | dev_set_drvdata(&rpdev->dev, idata); | |
70 | ||
779b96d2 | 71 | /* send a message to our remote processor */ |
2a48d732 | 72 | ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG)); |
779b96d2 OBC |
73 | if (ret) { |
74 | dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
92e1de51 | 81 | static void rpmsg_sample_remove(struct rpmsg_device *rpdev) |
779b96d2 OBC |
82 | { |
83 | dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n"); | |
84 | } | |
85 | ||
86 | static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = { | |
87 | { .name = "rpmsg-client-sample" }, | |
88 | { }, | |
89 | }; | |
90 | MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table); | |
91 | ||
92 | static struct rpmsg_driver rpmsg_sample_client = { | |
93 | .drv.name = KBUILD_MODNAME, | |
779b96d2 OBC |
94 | .id_table = rpmsg_driver_sample_id_table, |
95 | .probe = rpmsg_sample_probe, | |
96 | .callback = rpmsg_sample_cb, | |
6ae14171 | 97 | .remove = rpmsg_sample_remove, |
779b96d2 | 98 | }; |
b4f78259 | 99 | module_rpmsg_driver(rpmsg_sample_client); |
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100 | |
101 | MODULE_DESCRIPTION("Remote processor messaging sample client driver"); | |
102 | MODULE_LICENSE("GPL v2"); |