97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Remote processor messaging - sample client driver
|
|
*
|
|
* Copyright (C) 2011 Texas Instruments, Inc.
|
|
* Copyright (C) 2011 Google, Inc.
|
|
*
|
|
* Ohad Ben-Cohen <ohad@wizery.com>
|
|
* Brian Swetland <swetland@google.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rpmsg.h>
|
|
|
|
#define MSG "hello world!"
|
|
|
|
static int count = 100;
|
|
module_param(count, int, 0644);
|
|
|
|
struct instance_data {
|
|
int rx_count;
|
|
};
|
|
|
|
static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
|
|
void *priv, u32 src)
|
|
{
|
|
int ret;
|
|
struct instance_data *idata = dev_get_drvdata(&rpdev->dev);
|
|
|
|
dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n",
|
|
++idata->rx_count, src);
|
|
|
|
print_hex_dump_debug(__func__, DUMP_PREFIX_NONE, 16, 1, data, len,
|
|
true);
|
|
|
|
/* samples should not live forever */
|
|
if (idata->rx_count >= count) {
|
|
dev_info(&rpdev->dev, "goodbye!\n");
|
|
return 0;
|
|
}
|
|
|
|
/* send a new message now */
|
|
ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
|
|
if (ret)
|
|
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
|
|
{
|
|
int ret;
|
|
struct instance_data *idata;
|
|
|
|
dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
|
|
rpdev->src, rpdev->dst);
|
|
|
|
idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL);
|
|
if (!idata)
|
|
return -ENOMEM;
|
|
|
|
dev_set_drvdata(&rpdev->dev, idata);
|
|
|
|
/* send a message to our remote processor */
|
|
ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
|
|
if (ret) {
|
|
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rpmsg_sample_remove(struct rpmsg_device *rpdev)
|
|
{
|
|
dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
|
|
}
|
|
|
|
static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
|
|
{ .name = "rpmsg-client-sample" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
|
|
|
|
static struct rpmsg_driver rpmsg_sample_client = {
|
|
.drv.name = KBUILD_MODNAME,
|
|
.id_table = rpmsg_driver_sample_id_table,
|
|
.probe = rpmsg_sample_probe,
|
|
.callback = rpmsg_sample_cb,
|
|
.remove = rpmsg_sample_remove,
|
|
};
|
|
module_rpmsg_driver(rpmsg_sample_client);
|
|
|
|
MODULE_DESCRIPTION("Remote processor messaging sample client driver");
|
|
MODULE_LICENSE("GPL v2");
|