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![Yang Yingliang](/assets/img/avatar_default.png)
module_rpmsg_driver() makes the code simpler by eliminating boilerplate code. Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Link: https://lore.kernel.org/r/20210602082610.3828408-1-yangyingliang@huawei.com Signed-off-by: Mark Brown <broonie@kernel.org>
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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// Copyright 2017-2020 NXP
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#include <linux/module.h>
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#include <linux/rpmsg.h>
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#include "imx-pcm-rpmsg.h"
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/*
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* struct imx_audio_rpmsg: private data
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*
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* @rpmsg_pdev: pointer of platform device
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*/
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struct imx_audio_rpmsg {
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struct platform_device *rpmsg_pdev;
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};
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static int imx_audio_rpmsg_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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struct imx_audio_rpmsg *rpmsg = dev_get_drvdata(&rpdev->dev);
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struct rpmsg_r_msg *r_msg = (struct rpmsg_r_msg *)data;
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struct rpmsg_info *info;
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struct rpmsg_msg *msg;
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unsigned long flags;
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if (!rpmsg->rpmsg_pdev)
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return 0;
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info = platform_get_drvdata(rpmsg->rpmsg_pdev);
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dev_dbg(&rpdev->dev, "get from%d: cmd:%d. %d\n",
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src, r_msg->header.cmd, r_msg->param.resp);
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switch (r_msg->header.type) {
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case MSG_TYPE_C:
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/* TYPE C is notification from M core */
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switch (r_msg->header.cmd) {
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case TX_PERIOD_DONE:
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spin_lock_irqsave(&info->lock[TX], flags);
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msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM];
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msg->r_msg.param.buffer_tail =
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r_msg->param.buffer_tail;
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msg->r_msg.param.buffer_tail %= info->num_period[TX];
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spin_unlock_irqrestore(&info->lock[TX], flags);
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info->callback[TX](info->callback_param[TX]);
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break;
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case RX_PERIOD_DONE:
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spin_lock_irqsave(&info->lock[RX], flags);
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msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM];
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msg->r_msg.param.buffer_tail =
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r_msg->param.buffer_tail;
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msg->r_msg.param.buffer_tail %= info->num_period[1];
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spin_unlock_irqrestore(&info->lock[RX], flags);
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info->callback[RX](info->callback_param[RX]);
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break;
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default:
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dev_warn(&rpdev->dev, "unknown msg command\n");
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break;
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}
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break;
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case MSG_TYPE_B:
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/* TYPE B is response msg */
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memcpy(&info->r_msg, r_msg, sizeof(struct rpmsg_r_msg));
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complete(&info->cmd_complete);
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break;
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default:
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dev_warn(&rpdev->dev, "unknown msg type\n");
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break;
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}
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return 0;
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}
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static int imx_audio_rpmsg_probe(struct rpmsg_device *rpdev)
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{
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struct imx_audio_rpmsg *data;
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int ret = 0;
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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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data = devm_kzalloc(&rpdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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dev_set_drvdata(&rpdev->dev, data);
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/* Register platform driver for rpmsg routine */
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data->rpmsg_pdev = platform_device_register_data(&rpdev->dev,
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IMX_PCM_DRV_NAME,
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PLATFORM_DEVID_NONE,
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NULL, 0);
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if (IS_ERR(data->rpmsg_pdev)) {
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dev_err(&rpdev->dev, "failed to register rpmsg platform.\n");
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ret = PTR_ERR(data->rpmsg_pdev);
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}
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return ret;
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}
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static void imx_audio_rpmsg_remove(struct rpmsg_device *rpdev)
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{
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struct imx_audio_rpmsg *data = dev_get_drvdata(&rpdev->dev);
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if (data->rpmsg_pdev)
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platform_device_unregister(data->rpmsg_pdev);
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dev_info(&rpdev->dev, "audio rpmsg driver is removed\n");
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}
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static struct rpmsg_device_id imx_audio_rpmsg_id_table[] = {
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{ .name = "rpmsg-audio-channel" },
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{ },
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};
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static struct rpmsg_driver imx_audio_rpmsg_driver = {
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.drv.name = "imx_audio_rpmsg",
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.drv.owner = THIS_MODULE,
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.id_table = imx_audio_rpmsg_id_table,
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.probe = imx_audio_rpmsg_probe,
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.callback = imx_audio_rpmsg_cb,
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.remove = imx_audio_rpmsg_remove,
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};
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module_rpmsg_driver(imx_audio_rpmsg_driver);
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MODULE_DESCRIPTION("Freescale SoC Audio RPMSG interface");
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MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
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MODULE_ALIAS("platform:imx_audio_rpmsg");
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MODULE_LICENSE("GPL v2");
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