134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/mhi.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/sock.h>
|
|
|
|
#include "qrtr.h"
|
|
|
|
struct qrtr_mhi_dev {
|
|
struct qrtr_endpoint ep;
|
|
struct mhi_device *mhi_dev;
|
|
struct device *dev;
|
|
};
|
|
|
|
/* From MHI to QRTR */
|
|
static void qcom_mhi_qrtr_dl_callback(struct mhi_device *mhi_dev,
|
|
struct mhi_result *mhi_res)
|
|
{
|
|
struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
|
|
int rc;
|
|
|
|
if (!qdev || mhi_res->transaction_status)
|
|
return;
|
|
|
|
rc = qrtr_endpoint_post(&qdev->ep, mhi_res->buf_addr,
|
|
mhi_res->bytes_xferd);
|
|
if (rc == -EINVAL)
|
|
dev_err(qdev->dev, "invalid ipcrouter packet\n");
|
|
}
|
|
|
|
/* From QRTR to MHI */
|
|
static void qcom_mhi_qrtr_ul_callback(struct mhi_device *mhi_dev,
|
|
struct mhi_result *mhi_res)
|
|
{
|
|
struct sk_buff *skb = mhi_res->buf_addr;
|
|
|
|
if (skb->sk)
|
|
sock_put(skb->sk);
|
|
consume_skb(skb);
|
|
}
|
|
|
|
/* Send data over MHI */
|
|
static int qcom_mhi_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
|
|
{
|
|
struct qrtr_mhi_dev *qdev = container_of(ep, struct qrtr_mhi_dev, ep);
|
|
int rc;
|
|
|
|
rc = skb_linearize(skb);
|
|
if (rc)
|
|
goto free_skb;
|
|
|
|
rc = mhi_queue_skb(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len,
|
|
MHI_EOT);
|
|
if (rc)
|
|
goto free_skb;
|
|
|
|
if (skb->sk)
|
|
sock_hold(skb->sk);
|
|
|
|
return rc;
|
|
|
|
free_skb:
|
|
kfree_skb(skb);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev,
|
|
const struct mhi_device_id *id)
|
|
{
|
|
struct qrtr_mhi_dev *qdev;
|
|
int rc;
|
|
|
|
/* start channels */
|
|
rc = mhi_prepare_for_transfer(mhi_dev);
|
|
if (rc)
|
|
return rc;
|
|
|
|
qdev = devm_kzalloc(&mhi_dev->dev, sizeof(*qdev), GFP_KERNEL);
|
|
if (!qdev)
|
|
return -ENOMEM;
|
|
|
|
qdev->mhi_dev = mhi_dev;
|
|
qdev->dev = &mhi_dev->dev;
|
|
qdev->ep.xmit = qcom_mhi_qrtr_send;
|
|
|
|
dev_set_drvdata(&mhi_dev->dev, qdev);
|
|
rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
|
|
if (rc)
|
|
return rc;
|
|
|
|
dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void qcom_mhi_qrtr_remove(struct mhi_device *mhi_dev)
|
|
{
|
|
struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
|
|
|
|
qrtr_endpoint_unregister(&qdev->ep);
|
|
mhi_unprepare_from_transfer(mhi_dev);
|
|
dev_set_drvdata(&mhi_dev->dev, NULL);
|
|
}
|
|
|
|
static const struct mhi_device_id qcom_mhi_qrtr_id_table[] = {
|
|
{ .chan = "IPCR" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(mhi, qcom_mhi_qrtr_id_table);
|
|
|
|
static struct mhi_driver qcom_mhi_qrtr_driver = {
|
|
.probe = qcom_mhi_qrtr_probe,
|
|
.remove = qcom_mhi_qrtr_remove,
|
|
.dl_xfer_cb = qcom_mhi_qrtr_dl_callback,
|
|
.ul_xfer_cb = qcom_mhi_qrtr_ul_callback,
|
|
.id_table = qcom_mhi_qrtr_id_table,
|
|
.driver = {
|
|
.name = "qcom_mhi_qrtr",
|
|
},
|
|
};
|
|
|
|
module_mhi_driver(qcom_mhi_qrtr_driver);
|
|
|
|
MODULE_AUTHOR("Chris Lew <clew@codeaurora.org>");
|
|
MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
|
|
MODULE_DESCRIPTION("Qualcomm IPC-Router MHI interface driver");
|
|
MODULE_LICENSE("GPL v2");
|