// 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!"#define MSG_LIMIT	100 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(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,		       data, len,  true); 	/* samples should not live forever */	if (idata->rx_count >= MSG_LIMIT) {		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");