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