rpmsg_client_sample.c

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/*
 * Remote processor messaging - sample client driver
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 * Copyright (C) 2011 Google, Inc.
 *
 * Ohad Ben-Cohen <[email protected]>
 * Brian Swetland <[email protected]>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rpmsg.h>

#define MSG     "hello world!"
#define MSG_LIMIT   100

static void rpmsg_sample_cb(struct rpmsg_channel *rpdev, void *data, int len,
                        void *priv, u32 src)
{
    int ret;
    static int rx_count;

    dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n", ++rx_count, src);

    print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
               data, len,  true);

    /* samples should not live forever */
    if (rx_count >= MSG_LIMIT) {
        dev_info(&rpdev->dev, "goodbye!\n");
        return;
    }

    /* send a new message now */
    ret = rpmsg_send(rpdev, MSG, strlen(MSG));
    if (ret)
        dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
}

static int rpmsg_sample_probe(struct rpmsg_channel *rpdev)
{
    int ret;

    dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
                    rpdev->src, rpdev->dst);

    /* send a message to our remote processor */
    ret = rpmsg_send(rpdev, MSG, strlen(MSG));
    if (ret) {
        dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
        return ret;
    }

    return 0;
}

static void __devexit rpmsg_sample_remove(struct rpmsg_channel *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,
    .drv.owner  = THIS_MODULE,
    .id_table   = rpmsg_driver_sample_id_table,
    .probe      = rpmsg_sample_probe,
    .callback   = rpmsg_sample_cb,
    .remove     = __devexit_p(rpmsg_sample_remove),
};

static int __init rpmsg_client_sample_init(void)
{
    return register_rpmsg_driver(&rpmsg_sample_client);
}
module_init(rpmsg_client_sample_init);

static void __exit rpmsg_client_sample_fini(void)
{
    unregister_rpmsg_driver(&rpmsg_sample_client);
}
module_exit(rpmsg_client_sample_fini);

MODULE_DESCRIPTION("Remote processor messaging sample client driver");
MODULE_LICENSE("GPL v2");