mirror of https://gitee.com/openkylin/linux.git
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
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/*
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* Copyright (c) 2015, Sony Mobile Communications Inc.
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* Copyright (c) 2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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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/module.h>
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#include <linux/skbuff.h>
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#include <linux/soc/qcom/smd.h>
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#include "qrtr.h"
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struct qrtr_smd_dev {
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struct qrtr_endpoint ep;
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struct qcom_smd_channel *channel;
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};
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/* from smd to qrtr */
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static int qcom_smd_qrtr_callback(struct qcom_smd_device *sdev,
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const void *data, size_t len)
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{
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struct qrtr_smd_dev *qdev = dev_get_drvdata(&sdev->dev);
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int rc;
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if (!qdev)
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return -EAGAIN;
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rc = qrtr_endpoint_post(&qdev->ep, data, len);
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if (rc == -EINVAL) {
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dev_err(&sdev->dev, "invalid ipcrouter packet\n");
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/* return 0 to let smd drop the packet */
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rc = 0;
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}
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return rc;
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}
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/* from qrtr to smd */
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static int qcom_smd_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
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{
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struct qrtr_smd_dev *qdev = container_of(ep, struct qrtr_smd_dev, ep);
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int rc;
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rc = skb_linearize(skb);
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if (rc)
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goto out;
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rc = qcom_smd_send(qdev->channel, skb->data, skb->len);
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out:
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if (rc)
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kfree_skb(skb);
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else
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consume_skb(skb);
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return rc;
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}
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static int qcom_smd_qrtr_probe(struct qcom_smd_device *sdev)
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{
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struct qrtr_smd_dev *qdev;
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int rc;
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qdev = devm_kzalloc(&sdev->dev, sizeof(*qdev), GFP_KERNEL);
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if (!qdev)
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return -ENOMEM;
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qdev->channel = sdev->channel;
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qdev->ep.xmit = qcom_smd_qrtr_send;
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rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
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if (rc)
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return rc;
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dev_set_drvdata(&sdev->dev, qdev);
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dev_dbg(&sdev->dev, "Qualcomm SMD QRTR driver probed\n");
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return 0;
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}
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static void qcom_smd_qrtr_remove(struct qcom_smd_device *sdev)
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{
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struct qrtr_smd_dev *qdev = dev_get_drvdata(&sdev->dev);
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qrtr_endpoint_unregister(&qdev->ep);
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dev_set_drvdata(&sdev->dev, NULL);
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}
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static const struct qcom_smd_id qcom_smd_qrtr_smd_match[] = {
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{ "IPCRTR" },
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{}
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};
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static struct qcom_smd_driver qcom_smd_qrtr_driver = {
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.probe = qcom_smd_qrtr_probe,
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.remove = qcom_smd_qrtr_remove,
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.callback = qcom_smd_qrtr_callback,
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.smd_match_table = qcom_smd_qrtr_smd_match,
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.driver = {
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.name = "qcom_smd_qrtr",
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.owner = THIS_MODULE,
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},
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};
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module_qcom_smd_driver(qcom_smd_qrtr_driver);
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MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
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MODULE_LICENSE("GPL v2");
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