[thirdparty/linux.git] / samples / rpmsg / rpmsg_client_sample.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");
Commit	Line	Data
9c92ab61	1	// SPDX-License-Identifier: GPL-2.0-only
779b96d2 OBC	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>
779b96d2 OBC	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/rpmsg.h>
	15
	16	#define MSG "hello world!"
9a703eb7 SA	17
	18	static int count = 100;
	19	module_param(count, int, 0644);
779b96d2	20
a138c883 AS	21	struct instance_data {
	22	int rx_count;
	23	};
	24
4b83c52a	25	static int rpmsg_sample_cb(struct rpmsg_device rpdev, void data, int len,
779b96d2 OBC	26	void *priv, u32 src)
	27	{
	28	int ret;
a138c883	29	struct instance_data *idata = dev_get_drvdata(&rpdev->dev);
779b96d2	30
a138c883 AS	31	dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n",
a138c883 AS	32	++idata->rx_count, src);
779b96d2	33
2519fbb3 SA	34	print_hex_dump_debug(__func__, DUMP_PREFIX_NONE, 16, 1, data, len,
2519fbb3 SA	35	true);
779b96d2 OBC	36
779b96d2 OBC	37	/* samples should not live forever */
9a703eb7	38	if (idata->rx_count >= count) {
779b96d2	39	dev_info(&rpdev->dev, "goodbye!\n");
4b83c52a	40	return 0;
779b96d2 OBC	41	}
	42
	43	/* send a new message now */
2a48d732	44	ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
779b96d2 OBC	45	if (ret)
779b96d2 OBC	46	dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
4b83c52a BA	47
4b83c52a BA	48	return 0;
779b96d2 OBC	49	}
779b96d2 OBC	50
92e1de51	51	static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
779b96d2 OBC	52	{
779b96d2 OBC	53	int ret;
a138c883	54	struct instance_data *idata;
779b96d2 OBC	55
	56	dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
	57	rpdev->src, rpdev->dst);
	58
a138c883 AS	59	idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL);
	60	if (!idata)
	61	return -ENOMEM;
	62
	63	dev_set_drvdata(&rpdev->dev, idata);
	64
779b96d2	65	/* send a message to our remote processor */
2a48d732	66	ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
779b96d2 OBC	67	if (ret) {
	68	dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
	69	return ret;
	70	}
	71
	72	return 0;
	73	}
	74
92e1de51	75	static void rpmsg_sample_remove(struct rpmsg_device *rpdev)
779b96d2 OBC	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,
779b96d2 OBC	88	.id_table = rpmsg_driver_sample_id_table,
	89	.probe = rpmsg_sample_probe,
	90	.callback = rpmsg_sample_cb,
6ae14171	91	.remove = rpmsg_sample_remove,
779b96d2	92	};
b4f78259	93	module_rpmsg_driver(rpmsg_sample_client);
779b96d2 OBC	94
	95	MODULE_DESCRIPTION("Remote processor messaging sample client driver");
	96	MODULE_LICENSE("GPL v2");