blob: f161dfd3e70a7aaf575e022f4390762f0608a9bc [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
Anna, Sumana138c882016-08-12 18:42:28 -050027struct instance_data {
28 int rx_count;
29};
30
Bjorn Andersson4b83c522016-09-01 15:28:08 -070031static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020032 void *priv, u32 src)
33{
34 int ret;
Anna, Sumana138c882016-08-12 18:42:28 -050035 struct instance_data *idata = dev_get_drvdata(&rpdev->dev);
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020036
Anna, Sumana138c882016-08-12 18:42:28 -050037 dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n",
38 ++idata->rx_count, src);
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020039
40 print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
41 data, len, true);
42
43 /* samples should not live forever */
Anna, Sumana138c882016-08-12 18:42:28 -050044 if (idata->rx_count >= MSG_LIMIT) {
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020045 dev_info(&rpdev->dev, "goodbye!\n");
Bjorn Andersson4b83c522016-09-01 15:28:08 -070046 return 0;
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020047 }
48
49 /* send a new message now */
Bjorn Andersson2a48d732016-09-01 15:27:55 -070050 ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020051 if (ret)
52 dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
Bjorn Andersson4b83c522016-09-01 15:28:08 -070053
54 return 0;
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020055}
56
Bjorn Andersson92e1de52016-09-01 15:27:57 -070057static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020058{
59 int ret;
Anna, Sumana138c882016-08-12 18:42:28 -050060 struct instance_data *idata;
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020061
62 dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
63 rpdev->src, rpdev->dst);
64
Anna, Sumana138c882016-08-12 18:42:28 -050065 idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL);
66 if (!idata)
67 return -ENOMEM;
68
69 dev_set_drvdata(&rpdev->dev, idata);
70
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020071 /* send a message to our remote processor */
Bjorn Andersson2a48d732016-09-01 15:27:55 -070072 ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020073 if (ret) {
74 dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
75 return ret;
76 }
77
78 return 0;
79}
80
Bjorn Andersson92e1de52016-09-01 15:27:57 -070081static void rpmsg_sample_remove(struct rpmsg_device *rpdev)
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020082{
83 dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
84}
85
86static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
87 { .name = "rpmsg-client-sample" },
88 { },
89};
90MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
91
92static struct rpmsg_driver rpmsg_sample_client = {
93 .drv.name = KBUILD_MODNAME,
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020094 .id_table = rpmsg_driver_sample_id_table,
95 .probe = rpmsg_sample_probe,
96 .callback = rpmsg_sample_cb,
Greg Kroah-Hartman6ae14172012-12-21 15:16:45 -080097 .remove = rpmsg_sample_remove,
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +020098};
Andrew F. Davisb4f78252016-05-04 17:01:39 -050099module_rpmsg_driver(rpmsg_sample_client);
Ohad Ben-Cohen779b96d2011-10-20 21:41:24 +0200100
101MODULE_DESCRIPTION("Remote processor messaging sample client driver");
102MODULE_LICENSE("GPL v2");