/*
   * 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>
   *
   * 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)
  ", ++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!
  ");
  		return;
  	}
  
  	/* send a new message now */
  	ret = rpmsg_send(rpdev, MSG, strlen(MSG));
  	if (ret)
  		dev_err(&rpdev->dev, "rpmsg_send failed: %d
  ", ret);
  }
  
  static int rpmsg_sample_probe(struct rpmsg_channel *rpdev)
  {
  	int ret;
  
  	dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!
  ",
  					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
  ", ret);
  		return ret;
  	}
  
  	return 0;
  }

  static void rpmsg_sample_remove(struct rpmsg_channel *rpdev)

  {
  	dev_info(&rpdev->dev, "rpmsg sample client driver is removed
  ");
  }
  
  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		= 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");