117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
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#define DEBUG
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/*
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* Remote processor messaging - sample client driver
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Ohad Ben-Cohen <ohad@wizery.com>
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* Brian Swetland <swetland@google.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rpmsg.h>
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#include <linux/workqueue.h>
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#include "linux/types.h"
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#define MSG "hello world!"
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#define MSG_LIMIT 100
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struct instance_data {
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int rx_count;
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};
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static struct delayed_work work;
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static struct rpmsg_device *rd;
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static uint32_t cnt;
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static void work_func(struct work_struct *work)
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{
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int ret;
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char buf[50];
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sprintf(buf, "send cnt:%d", cnt++);
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printk("%s\n", buf);
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/* send a message to our remote processor */
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ret = rpmsg_send(rd->ept, buf, strlen(buf) + cnt);
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if (ret)
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dev_err(&rd->dev, "rpmsg_send failed: %d\n", ret);
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if (cnt > (512 - 16))
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cnt = 0;
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schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(500));
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}
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static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
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void *priv, u32 src)
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{
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char *p = data;
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p[len] = '\0';
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printk(KERN_INFO "recv data(%d):%s\n", len, p);
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return 0;
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}
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static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
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{
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struct instance_data *idata;
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rd = rpdev;
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INIT_DELAYED_WORK(&work, work_func);
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dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
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rpdev->src, rpdev->dst);
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idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL);
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if (!idata)
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return -ENOMEM;
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dev_set_drvdata(&rpdev->dev, idata);
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schedule_delayed_work(&work, msecs_to_jiffies(500));
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/* wo need to announce the new ept to remote */
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rpdev->announce = rpdev->src != RPMSG_ADDR_ANY;
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return 0;
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}
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static void rpmsg_sample_remove(struct rpmsg_device *rpdev)
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{
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dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
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cancel_delayed_work(&work);
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}
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static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
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{ .name = "sunxi,sun8iw21p1-e907" },
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{ },
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};
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MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
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static struct rpmsg_driver rpmsg_sample_client = {
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.drv.name = KBUILD_MODNAME,
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.id_table = rpmsg_driver_sample_id_table,
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.probe = rpmsg_sample_probe,
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.callback = rpmsg_sample_cb,
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.remove = rpmsg_sample_remove,
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};
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module_rpmsg_driver(rpmsg_sample_client);
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MODULE_DESCRIPTION("Remote processor messaging sample client driver");
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MODULE_LICENSE("GPL v2");
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