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-rw-r--r--net/qrtr/mhi.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c
new file mode 100644
index 000000000000..ff0c41467fc1
--- /dev/null
+++ b/net/qrtr/mhi.c
@@ -0,0 +1,127 @@
+// 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");