[linux.git] / net / qrtr / smd.c

// 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");
Commit	Line	Data
97fb5e8d	1	// SPDX-License-Identifier: GPL-2.0-only
bdabad3e CC	2	/*
	3	* Copyright (c) 2015, Sony Mobile Communications Inc.
	4	* Copyright (c) 2013, The Linux Foundation. All rights reserved.
bdabad3e CC	5	*/
	6
	7	#include <linux/module.h>
	8	#include <linux/skbuff.h>
5052de8d	9	#include <linux/rpmsg.h>
bdabad3e CC	10
	11	#include "qrtr.h"
	12
	13	struct qrtr_smd_dev {
	14	struct qrtr_endpoint ep;
5052de8d	15	struct rpmsg_endpoint *channel;
f79a917e	16	struct device *dev;
bdabad3e CC	17	};
	18
	19	/* from smd to qrtr */
5052de8d BA	20	static int qcom_smd_qrtr_callback(struct rpmsg_device *rpdev,
5052de8d BA	21	void data, int len, void priv, u32 addr)
bdabad3e	22	{
5052de8d	23	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
bdabad3e CC	24	int rc;
	25
	26	if (!qdev)
	27	return -EAGAIN;
	28
	29	rc = qrtr_endpoint_post(&qdev->ep, data, len);
	30	if (rc == -EINVAL) {
f79a917e	31	dev_err(qdev->dev, "invalid ipcrouter packet\n");
bdabad3e CC	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
5052de8d	49	rc = rpmsg_send(qdev->channel, skb->data, skb->len);
bdabad3e CC	50
	51	out:
	52	if (rc)
	53	kfree_skb(skb);
	54	else
	55	consume_skb(skb);
	56	return rc;
	57	}
	58
5052de8d	59	static int qcom_smd_qrtr_probe(struct rpmsg_device *rpdev)
bdabad3e CC	60	{
	61	struct qrtr_smd_dev *qdev;
	62	int rc;
	63
5052de8d	64	qdev = devm_kzalloc(&rpdev->dev, sizeof(*qdev), GFP_KERNEL);
bdabad3e CC	65	if (!qdev)
	66	return -ENOMEM;
	67
5052de8d BA	68	qdev->channel = rpdev->ept;
5052de8d BA	69	qdev->dev = &rpdev->dev;
bdabad3e CC	70	qdev->ep.xmit = qcom_smd_qrtr_send;
	71
	72	rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
	73	if (rc)
	74	return rc;
	75
5052de8d	76	dev_set_drvdata(&rpdev->dev, qdev);
bdabad3e	77
5052de8d	78	dev_dbg(&rpdev->dev, "Qualcomm SMD QRTR driver probed\n");
bdabad3e CC	79
	80	return 0;
	81	}
	82
5052de8d	83	static void qcom_smd_qrtr_remove(struct rpmsg_device *rpdev)
bdabad3e	84	{
5052de8d	85	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
bdabad3e CC	86
	87	qrtr_endpoint_unregister(&qdev->ep);
	88
5052de8d	89	dev_set_drvdata(&rpdev->dev, NULL);
bdabad3e CC	90	}
bdabad3e CC	91
5052de8d	92	static const struct rpmsg_device_id qcom_smd_qrtr_smd_match[] = {
bdabad3e CC	93	{ "IPCRTR" },
	94	{}
	95	};
	96
5052de8d	97	static struct rpmsg_driver qcom_smd_qrtr_driver = {
bdabad3e CC	98	.probe = qcom_smd_qrtr_probe,
	99	.remove = qcom_smd_qrtr_remove,
	100	.callback = qcom_smd_qrtr_callback,
5052de8d BA	101	.id_table = qcom_smd_qrtr_smd_match,
5052de8d BA	102	.drv = {
bdabad3e	103	.name = "qcom_smd_qrtr",
bdabad3e CC	104	},
	105	};
	106
5052de8d	107	module_rpmsg_driver(qcom_smd_qrtr_driver);
bdabad3e	108
c77f5fbb	109	MODULE_ALIAS("rpmsg:IPCRTR");
bdabad3e CC	110	MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
bdabad3e CC	111	MODULE_LICENSE("GPL v2");