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