net: qrtr: Add MHI transport layer

MHI is the transport layer used for communicating to the external modems.
Hence, this commit adds MHI transport layer support to QRTR for
transferring the QMI messages over IPC Router.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/qrtr/Kconfig b/net/qrtr/Kconfig
index 63f89cc6e82ca57243bdbf941845595e819a09a2..8eb876471564b9ef02dc561068e815f4305fd159 100644 (file)
--- a/net/qrtr/Kconfig
+++ b/net/qrtr/Kconfig
@@ -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

diff --git a/net/qrtr/Makefile b/net/qrtr/Makefile
index 32d4e923925d4b68a1276ffa7f29ddcef89f689f..1b1411d158a732736f035ae98979a1df21d2f7e8 100644 (file)
--- a/net/qrtr/Makefile
+++ b/net/qrtr/Makefile
@@ -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

diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c
new file mode 100644 (file)
index 0000000..ff0c414
--- /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");