1 files changed, 111 insertions, 0 deletions
diff --git a/net/qrtr/smd.c b/net/qrtr/smd.c
new file mode 100644
index 000000000..c91bf030f
--- /dev/null
+++ b/net/qrtr/smd.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015, Sony Mobile Communications Inc.
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/rpmsg.h>
+
+#include "qrtr.h"
+
+struct qrtr_smd_dev {
+	struct qrtr_endpoint ep;
+	struct rpmsg_endpoint *channel;
+	struct device *dev;
+};
+
+/* from smd to qrtr */
+static int qcom_smd_qrtr_callback(struct rpmsg_device *rpdev,
+				  void *data, int len, void *priv, u32 addr)
+{
+	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
+	int rc;
+
+	if (!qdev)
+		return -EAGAIN;
+
+	rc = qrtr_endpoint_post(&qdev->ep, data, len);
+	if (rc == -EINVAL) {
+		dev_err(qdev->dev, "invalid ipcrouter packet\n");
+		/* return 0 to let smd drop the packet */
+		rc = 0;
+	}
+
+	return rc;
+}
+
+/* from qrtr to smd */
+static int qcom_smd_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
+{
+	struct qrtr_smd_dev *qdev = container_of(ep, struct qrtr_smd_dev, ep);
+	int rc;
+
+	rc = skb_linearize(skb);
+	if (rc)
+		goto out;
+
+	rc = rpmsg_send(qdev->channel, skb->data, skb->len);
+
+out:
+	if (rc)
+		kfree_skb(skb);
+	else
+		consume_skb(skb);
+	return rc;
+}
+
+static int qcom_smd_qrtr_probe(struct rpmsg_device *rpdev)
+{
+	struct qrtr_smd_dev *qdev;
+	int rc;
+
+	qdev = devm_kzalloc(&rpdev->dev, sizeof(*qdev), GFP_KERNEL);
+	if (!qdev)
+		return -ENOMEM;
+
+	qdev->channel = rpdev->ept;
+	qdev->dev = &rpdev->dev;
+	qdev->ep.xmit = qcom_smd_qrtr_send;
+
+	rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
+	if (rc)
+		return rc;
+
+	dev_set_drvdata(&rpdev->dev, qdev);
+
+	dev_dbg(&rpdev->dev, "Qualcomm SMD QRTR driver probed\n");
+
+	return 0;
+}
+
+static void qcom_smd_qrtr_remove(struct rpmsg_device *rpdev)
+{
+	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
+
+	qrtr_endpoint_unregister(&qdev->ep);
+
+	dev_set_drvdata(&rpdev->dev, NULL);
+}
+
+static const struct rpmsg_device_id qcom_smd_qrtr_smd_match[] = {
+	{ "IPCRTR" },
+	{}
+};
+
+static struct rpmsg_driver qcom_smd_qrtr_driver = {
+	.probe = qcom_smd_qrtr_probe,
+	.remove = qcom_smd_qrtr_remove,
+	.callback = qcom_smd_qrtr_callback,
+	.id_table = qcom_smd_qrtr_smd_match,
+	.drv = {
+		.name = "qcom_smd_qrtr",
+	},
+};
+
+module_rpmsg_driver(qcom_smd_qrtr_driver);
+
+MODULE_ALIAS("rpmsg:IPCRTR");
+MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
+MODULE_LICENSE("GPL v2");