linux/samples/rpmsg/rpmsg_client_sample.c
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   1/*
   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
  27static void rpmsg_sample_cb(struct rpmsg_channel *rpdev, void *data, int len,
  28                                                void *priv, u32 src)
  29{
  30        int ret;
  31        static int rx_count;
  32
  33        dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n", ++rx_count, src);
  34
  35        print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
  36                       data, len,  true);
  37
  38        /* samples should not live forever */
  39        if (rx_count >= MSG_LIMIT) {
  40                dev_info(&rpdev->dev, "goodbye!\n");
  41                return;
  42        }
  43
  44        /* send a new message now */
  45        ret = rpmsg_send(rpdev, MSG, strlen(MSG));
  46        if (ret)
  47                dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
  48}
  49
  50static int rpmsg_sample_probe(struct rpmsg_channel *rpdev)
  51{
  52        int ret;
  53
  54        dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
  55                                        rpdev->src, rpdev->dst);
  56
  57        /* send a message to our remote processor */
  58        ret = rpmsg_send(rpdev, MSG, strlen(MSG));
  59        if (ret) {
  60                dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
  61                return ret;
  62        }
  63
  64        return 0;
  65}
  66
  67static void __devexit rpmsg_sample_remove(struct rpmsg_channel *rpdev)
  68{
  69        dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
  70}
  71
  72static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
  73        { .name = "rpmsg-client-sample" },
  74        { },
  75};
  76MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
  77
  78static struct rpmsg_driver rpmsg_sample_client = {
  79        .drv.name       = KBUILD_MODNAME,
  80        .drv.owner      = THIS_MODULE,
  81        .id_table       = rpmsg_driver_sample_id_table,
  82        .probe          = rpmsg_sample_probe,
  83        .callback       = rpmsg_sample_cb,
  84        .remove         = __devexit_p(rpmsg_sample_remove),
  85};
  86
  87static int __init rpmsg_client_sample_init(void)
  88{
  89        return register_rpmsg_driver(&rpmsg_sample_client);
  90}
  91module_init(rpmsg_client_sample_init);
  92
  93static void __exit rpmsg_client_sample_fini(void)
  94{
  95        unregister_rpmsg_driver(&rpmsg_sample_client);
  96}
  97module_exit(rpmsg_client_sample_fini);
  98
  99MODULE_DESCRIPTION("Remote processor messaging sample client driver");
 100MODULE_LICENSE("GPL v2");
 101
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