Eric Lee / smarc-fsl-linux-kernel

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net/qrtr/mhi.c 2.79 KB
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6e728f321   Manivannan Sadhasivam   net: qrtr: Add MH... 
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  // 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
  ");
  }
  
  /* 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;
  
  	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
  ");
  
  	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);
  	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");