| // 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; |
| struct completion ready; |
| }; |
| |
| /* 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 = wait_for_completion_interruptible(&qdev->ready); |
| if (rc) |
| goto free_skb; |
| |
| if (skb->sk) |
| sock_hold(skb->sk); |
| |
| 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; |
| |
| return rc; |
| |
| free_skb: |
| if (skb->sk) |
| sock_put(skb->sk); |
| 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, 0); |
| 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; |
| |
| /* start channels */ |
| rc = mhi_prepare_for_transfer(mhi_dev, MHI_CH_INBOUND_ALLOC_BUFS); |
| if (rc) { |
| qrtr_endpoint_unregister(&qdev->ep); |
| dev_set_drvdata(&mhi_dev->dev, NULL); |
| return rc; |
| } |
| |
| complete_all(&qdev->ready); |
| 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"); |