xref: /openbmc/linux/net/qrtr/smd.c (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)
1*97fb5e8dSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2bdabad3eSCourtney Cavin /*
3bdabad3eSCourtney Cavin  * Copyright (c) 2015, Sony Mobile Communications Inc.
4bdabad3eSCourtney Cavin  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
5bdabad3eSCourtney Cavin  */
6bdabad3eSCourtney Cavin 
7bdabad3eSCourtney Cavin #include <linux/module.h>
8bdabad3eSCourtney Cavin #include <linux/skbuff.h>
95052de8dSBjorn Andersson #include <linux/rpmsg.h>
10bdabad3eSCourtney Cavin 
11bdabad3eSCourtney Cavin #include "qrtr.h"
12bdabad3eSCourtney Cavin 
13bdabad3eSCourtney Cavin struct qrtr_smd_dev {
14bdabad3eSCourtney Cavin 	struct qrtr_endpoint ep;
155052de8dSBjorn Andersson 	struct rpmsg_endpoint *channel;
16f79a917eSBjorn Andersson 	struct device *dev;
17bdabad3eSCourtney Cavin };
18bdabad3eSCourtney Cavin 
19bdabad3eSCourtney Cavin /* from smd to qrtr */
qcom_smd_qrtr_callback(struct rpmsg_device * rpdev,void * data,int len,void * priv,u32 addr)205052de8dSBjorn Andersson static int qcom_smd_qrtr_callback(struct rpmsg_device *rpdev,
215052de8dSBjorn Andersson 				  void *data, int len, void *priv, u32 addr)
22bdabad3eSCourtney Cavin {
235052de8dSBjorn Andersson 	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
24bdabad3eSCourtney Cavin 	int rc;
25bdabad3eSCourtney Cavin 
26bdabad3eSCourtney Cavin 	if (!qdev)
27bdabad3eSCourtney Cavin 		return -EAGAIN;
28bdabad3eSCourtney Cavin 
29bdabad3eSCourtney Cavin 	rc = qrtr_endpoint_post(&qdev->ep, data, len);
30bdabad3eSCourtney Cavin 	if (rc == -EINVAL) {
31f79a917eSBjorn Andersson 		dev_err(qdev->dev, "invalid ipcrouter packet\n");
32bdabad3eSCourtney Cavin 		/* return 0 to let smd drop the packet */
33bdabad3eSCourtney Cavin 		rc = 0;
34bdabad3eSCourtney Cavin 	}
35bdabad3eSCourtney Cavin 
36bdabad3eSCourtney Cavin 	return rc;
37bdabad3eSCourtney Cavin }
38bdabad3eSCourtney Cavin 
39bdabad3eSCourtney Cavin /* from qrtr to smd */
qcom_smd_qrtr_send(struct qrtr_endpoint * ep,struct sk_buff * skb)40bdabad3eSCourtney Cavin static int qcom_smd_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
41bdabad3eSCourtney Cavin {
42bdabad3eSCourtney Cavin 	struct qrtr_smd_dev *qdev = container_of(ep, struct qrtr_smd_dev, ep);
43bdabad3eSCourtney Cavin 	int rc;
44bdabad3eSCourtney Cavin 
45bdabad3eSCourtney Cavin 	rc = skb_linearize(skb);
46bdabad3eSCourtney Cavin 	if (rc)
47bdabad3eSCourtney Cavin 		goto out;
48bdabad3eSCourtney Cavin 
495052de8dSBjorn Andersson 	rc = rpmsg_send(qdev->channel, skb->data, skb->len);
50bdabad3eSCourtney Cavin 
51bdabad3eSCourtney Cavin out:
52bdabad3eSCourtney Cavin 	if (rc)
53bdabad3eSCourtney Cavin 		kfree_skb(skb);
54bdabad3eSCourtney Cavin 	else
55bdabad3eSCourtney Cavin 		consume_skb(skb);
56bdabad3eSCourtney Cavin 	return rc;
57bdabad3eSCourtney Cavin }
58bdabad3eSCourtney Cavin 
qcom_smd_qrtr_probe(struct rpmsg_device * rpdev)595052de8dSBjorn Andersson static int qcom_smd_qrtr_probe(struct rpmsg_device *rpdev)
60bdabad3eSCourtney Cavin {
61bdabad3eSCourtney Cavin 	struct qrtr_smd_dev *qdev;
62bdabad3eSCourtney Cavin 	int rc;
63bdabad3eSCourtney Cavin 
645052de8dSBjorn Andersson 	qdev = devm_kzalloc(&rpdev->dev, sizeof(*qdev), GFP_KERNEL);
65bdabad3eSCourtney Cavin 	if (!qdev)
66bdabad3eSCourtney Cavin 		return -ENOMEM;
67bdabad3eSCourtney Cavin 
685052de8dSBjorn Andersson 	qdev->channel = rpdev->ept;
695052de8dSBjorn Andersson 	qdev->dev = &rpdev->dev;
70bdabad3eSCourtney Cavin 	qdev->ep.xmit = qcom_smd_qrtr_send;
71bdabad3eSCourtney Cavin 
72bdabad3eSCourtney Cavin 	rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
73bdabad3eSCourtney Cavin 	if (rc)
74bdabad3eSCourtney Cavin 		return rc;
75bdabad3eSCourtney Cavin 
765052de8dSBjorn Andersson 	dev_set_drvdata(&rpdev->dev, qdev);
77bdabad3eSCourtney Cavin 
785052de8dSBjorn Andersson 	dev_dbg(&rpdev->dev, "Qualcomm SMD QRTR driver probed\n");
79bdabad3eSCourtney Cavin 
80bdabad3eSCourtney Cavin 	return 0;
81bdabad3eSCourtney Cavin }
82bdabad3eSCourtney Cavin 
qcom_smd_qrtr_remove(struct rpmsg_device * rpdev)835052de8dSBjorn Andersson static void qcom_smd_qrtr_remove(struct rpmsg_device *rpdev)
84bdabad3eSCourtney Cavin {
855052de8dSBjorn Andersson 	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
86bdabad3eSCourtney Cavin 
87bdabad3eSCourtney Cavin 	qrtr_endpoint_unregister(&qdev->ep);
88bdabad3eSCourtney Cavin 
895052de8dSBjorn Andersson 	dev_set_drvdata(&rpdev->dev, NULL);
90bdabad3eSCourtney Cavin }
91bdabad3eSCourtney Cavin 
925052de8dSBjorn Andersson static const struct rpmsg_device_id qcom_smd_qrtr_smd_match[] = {
93bdabad3eSCourtney Cavin 	{ "IPCRTR" },
94bdabad3eSCourtney Cavin 	{}
95bdabad3eSCourtney Cavin };
96bdabad3eSCourtney Cavin 
975052de8dSBjorn Andersson static struct rpmsg_driver qcom_smd_qrtr_driver = {
98bdabad3eSCourtney Cavin 	.probe = qcom_smd_qrtr_probe,
99bdabad3eSCourtney Cavin 	.remove = qcom_smd_qrtr_remove,
100bdabad3eSCourtney Cavin 	.callback = qcom_smd_qrtr_callback,
1015052de8dSBjorn Andersson 	.id_table = qcom_smd_qrtr_smd_match,
1025052de8dSBjorn Andersson 	.drv = {
103bdabad3eSCourtney Cavin 		.name = "qcom_smd_qrtr",
104bdabad3eSCourtney Cavin 	},
105bdabad3eSCourtney Cavin };
106bdabad3eSCourtney Cavin 
1075052de8dSBjorn Andersson module_rpmsg_driver(qcom_smd_qrtr_driver);
108bdabad3eSCourtney Cavin 
109c77f5fbbSRamon Fried MODULE_ALIAS("rpmsg:IPCRTR");
110bdabad3eSCourtney Cavin MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
111bdabad3eSCourtney Cavin MODULE_LICENSE("GPL v2");
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