net: qrtr: Add MHI transport layer (6e728f32) · Commits · 戴 / test

net/qrtr/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -29,4 +29,11 @@ config QRTR_TUN
		implement endpoints of QRTR, for purpose of tunneling data to other
		hosts or testing purposes.

		config QRTR_MHI
		tristate "MHI IPC Router channels"
		depends on MHI_BUS
		help
		Say Y here to support MHI based ipcrouter channels. MHI is the
		transport used for communicating to external modems.

		endif # QRTR

net/qrtr/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -5,3 +5,5 @@ obj-$(CONFIG_QRTR_SMD) += qrtr-smd.o
		qrtr-smd-y := smd.o
		obj-$(CONFIG_QRTR_TUN) += qrtr-tun.o
		qrtr-tun-y := tun.o
		obj-$(CONFIG_QRTR_MHI) += qrtr-mhi.o
		qrtr-mhi-y := mhi.o

net/qrtr/mhi.c

0 → 100644

+127 −0

Original line number	Diff line number	Diff line
		// 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;

		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);
		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");

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