| Courtney Cavin | bdabad3 | 2016-05-06 07:09:08 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015, Sony Mobile Communications Inc. |
| 3 | * Copyright (c) 2013, The Linux Foundation. All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 and |
| 7 | * only version 2 as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/soc/qcom/smd.h> |
| 18 | |
| 19 | #include "qrtr.h" |
| 20 | |
| 21 | struct qrtr_smd_dev { |
| 22 | struct qrtr_endpoint ep; |
| 23 | struct qcom_smd_channel *channel; |
| 24 | }; |
| 25 | |
| 26 | /* from smd to qrtr */ |
| 27 | static int qcom_smd_qrtr_callback(struct qcom_smd_device *sdev, |
| 28 | const void *data, size_t len) |
| 29 | { |
| 30 | struct qrtr_smd_dev *qdev = dev_get_drvdata(&sdev->dev); |
| 31 | int rc; |
| 32 | |
| 33 | if (!qdev) |
| 34 | return -EAGAIN; |
| 35 | |
| 36 | rc = qrtr_endpoint_post(&qdev->ep, data, len); |
| 37 | if (rc == -EINVAL) { |
| 38 | dev_err(&sdev->dev, "invalid ipcrouter packet\n"); |
| 39 | /* return 0 to let smd drop the packet */ |
| 40 | rc = 0; |
| 41 | } |
| 42 | |
| 43 | return rc; |
| 44 | } |
| 45 | |
| 46 | /* from qrtr to smd */ |
| 47 | static int qcom_smd_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb) |
| 48 | { |
| 49 | struct qrtr_smd_dev *qdev = container_of(ep, struct qrtr_smd_dev, ep); |
| 50 | int rc; |
| 51 | |
| 52 | rc = skb_linearize(skb); |
| 53 | if (rc) |
| 54 | goto out; |
| 55 | |
| 56 | rc = qcom_smd_send(qdev->channel, skb->data, skb->len); |
| 57 | |
| 58 | out: |
| 59 | if (rc) |
| 60 | kfree_skb(skb); |
| 61 | else |
| 62 | consume_skb(skb); |
| 63 | return rc; |
| 64 | } |
| 65 | |
| 66 | static int qcom_smd_qrtr_probe(struct qcom_smd_device *sdev) |
| 67 | { |
| 68 | struct qrtr_smd_dev *qdev; |
| 69 | int rc; |
| 70 | |
| 71 | qdev = devm_kzalloc(&sdev->dev, sizeof(*qdev), GFP_KERNEL); |
| 72 | if (!qdev) |
| 73 | return -ENOMEM; |
| 74 | |
| 75 | qdev->channel = sdev->channel; |
| 76 | qdev->ep.xmit = qcom_smd_qrtr_send; |
| 77 | |
| 78 | rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO); |
| 79 | if (rc) |
| 80 | return rc; |
| 81 | |
| 82 | dev_set_drvdata(&sdev->dev, qdev); |
| 83 | |
| 84 | dev_dbg(&sdev->dev, "Qualcomm SMD QRTR driver probed\n"); |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | static void qcom_smd_qrtr_remove(struct qcom_smd_device *sdev) |
| 90 | { |
| 91 | struct qrtr_smd_dev *qdev = dev_get_drvdata(&sdev->dev); |
| 92 | |
| 93 | qrtr_endpoint_unregister(&qdev->ep); |
| 94 | |
| 95 | dev_set_drvdata(&sdev->dev, NULL); |
| 96 | } |
| 97 | |
| 98 | static const struct qcom_smd_id qcom_smd_qrtr_smd_match[] = { |
| 99 | { "IPCRTR" }, |
| 100 | {} |
| 101 | }; |
| 102 | |
| 103 | static struct qcom_smd_driver qcom_smd_qrtr_driver = { |
| 104 | .probe = qcom_smd_qrtr_probe, |
| 105 | .remove = qcom_smd_qrtr_remove, |
| 106 | .callback = qcom_smd_qrtr_callback, |
| 107 | .smd_match_table = qcom_smd_qrtr_smd_match, |
| 108 | .driver = { |
| 109 | .name = "qcom_smd_qrtr", |
| 110 | .owner = THIS_MODULE, |
| 111 | }, |
| 112 | }; |
| 113 | |
| 114 | module_qcom_smd_driver(qcom_smd_qrtr_driver); |
| 115 | |
| 116 | MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver"); |
| 117 | MODULE_LICENSE("GPL v2"); |