1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) 2015, Sony Mobile Communications Inc.
4*4882a593Smuzhiyun * Copyright (c) 2013, The Linux Foundation. All rights reserved.
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/module.h>
8*4882a593Smuzhiyun #include <linux/skbuff.h>
9*4882a593Smuzhiyun #include <linux/rpmsg.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include "qrtr.h"
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun struct qrtr_smd_dev {
14*4882a593Smuzhiyun struct qrtr_endpoint ep;
15*4882a593Smuzhiyun struct rpmsg_endpoint *channel;
16*4882a593Smuzhiyun struct device *dev;
17*4882a593Smuzhiyun };
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun /* from smd to qrtr */
qcom_smd_qrtr_callback(struct rpmsg_device * rpdev,void * data,int len,void * priv,u32 addr)20*4882a593Smuzhiyun static int qcom_smd_qrtr_callback(struct rpmsg_device *rpdev,
21*4882a593Smuzhiyun void *data, int len, void *priv, u32 addr)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
24*4882a593Smuzhiyun int rc;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun if (!qdev)
27*4882a593Smuzhiyun return -EAGAIN;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun rc = qrtr_endpoint_post(&qdev->ep, data, len);
30*4882a593Smuzhiyun if (rc == -EINVAL) {
31*4882a593Smuzhiyun dev_err(qdev->dev, "invalid ipcrouter packet\n");
32*4882a593Smuzhiyun /* return 0 to let smd drop the packet */
33*4882a593Smuzhiyun rc = 0;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun return rc;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun /* from qrtr to smd */
qcom_smd_qrtr_send(struct qrtr_endpoint * ep,struct sk_buff * skb)40*4882a593Smuzhiyun static int qcom_smd_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun struct qrtr_smd_dev *qdev = container_of(ep, struct qrtr_smd_dev, ep);
43*4882a593Smuzhiyun int rc;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun rc = skb_linearize(skb);
46*4882a593Smuzhiyun if (rc)
47*4882a593Smuzhiyun goto out;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun rc = rpmsg_send(qdev->channel, skb->data, skb->len);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun out:
52*4882a593Smuzhiyun if (rc)
53*4882a593Smuzhiyun kfree_skb(skb);
54*4882a593Smuzhiyun else
55*4882a593Smuzhiyun consume_skb(skb);
56*4882a593Smuzhiyun return rc;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
qcom_smd_qrtr_probe(struct rpmsg_device * rpdev)59*4882a593Smuzhiyun static int qcom_smd_qrtr_probe(struct rpmsg_device *rpdev)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun struct qrtr_smd_dev *qdev;
62*4882a593Smuzhiyun int rc;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun qdev = devm_kzalloc(&rpdev->dev, sizeof(*qdev), GFP_KERNEL);
65*4882a593Smuzhiyun if (!qdev)
66*4882a593Smuzhiyun return -ENOMEM;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun qdev->channel = rpdev->ept;
69*4882a593Smuzhiyun qdev->dev = &rpdev->dev;
70*4882a593Smuzhiyun qdev->ep.xmit = qcom_smd_qrtr_send;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
73*4882a593Smuzhiyun if (rc)
74*4882a593Smuzhiyun return rc;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun dev_set_drvdata(&rpdev->dev, qdev);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun dev_dbg(&rpdev->dev, "Qualcomm SMD QRTR driver probed\n");
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun return 0;
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
qcom_smd_qrtr_remove(struct rpmsg_device * rpdev)83*4882a593Smuzhiyun static void qcom_smd_qrtr_remove(struct rpmsg_device *rpdev)
84*4882a593Smuzhiyun {
85*4882a593Smuzhiyun struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun qrtr_endpoint_unregister(&qdev->ep);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun dev_set_drvdata(&rpdev->dev, NULL);
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun static const struct rpmsg_device_id qcom_smd_qrtr_smd_match[] = {
93*4882a593Smuzhiyun { "IPCRTR" },
94*4882a593Smuzhiyun {}
95*4882a593Smuzhiyun };
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun static struct rpmsg_driver qcom_smd_qrtr_driver = {
98*4882a593Smuzhiyun .probe = qcom_smd_qrtr_probe,
99*4882a593Smuzhiyun .remove = qcom_smd_qrtr_remove,
100*4882a593Smuzhiyun .callback = qcom_smd_qrtr_callback,
101*4882a593Smuzhiyun .id_table = qcom_smd_qrtr_smd_match,
102*4882a593Smuzhiyun .drv = {
103*4882a593Smuzhiyun .name = "qcom_smd_qrtr",
104*4882a593Smuzhiyun },
105*4882a593Smuzhiyun };
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun module_rpmsg_driver(qcom_smd_qrtr_driver);
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun MODULE_ALIAS("rpmsg:IPCRTR");
110*4882a593Smuzhiyun MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
111*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
112