[mirror_ubuntu-artful-kernel.git] / net / qrtr / smd.c

/*
 * Copyright (c) 2015, Sony Mobile Communications Inc.
 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#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_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
bdabad3e CC	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>
5052de8d	17	#include <linux/rpmsg.h>
bdabad3e CC	18
	19	#include "qrtr.h"
	20
	21	struct qrtr_smd_dev {
	22	struct qrtr_endpoint ep;
5052de8d	23	struct rpmsg_endpoint *channel;
f79a917e	24	struct device *dev;
bdabad3e CC	25	};
	26
	27	/* from smd to qrtr */
5052de8d BA	28	static int qcom_smd_qrtr_callback(struct rpmsg_device *rpdev,
5052de8d BA	29	void data, int len, void priv, u32 addr)
bdabad3e	30	{
5052de8d	31	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
bdabad3e CC	32	int rc;
	33
	34	if (!qdev)
	35	return -EAGAIN;
	36
	37	rc = qrtr_endpoint_post(&qdev->ep, data, len);
	38	if (rc == -EINVAL) {
f79a917e	39	dev_err(qdev->dev, "invalid ipcrouter packet\n");
bdabad3e CC	40	/* return 0 to let smd drop the packet */
	41	rc = 0;
	42	}
	43
	44	return rc;
	45	}
	46
	47	/* from qrtr to smd */
	48	static int qcom_smd_qrtr_send(struct qrtr_endpoint ep, struct sk_buff skb)
	49	{
	50	struct qrtr_smd_dev *qdev = container_of(ep, struct qrtr_smd_dev, ep);
	51	int rc;
	52
	53	rc = skb_linearize(skb);
	54	if (rc)
	55	goto out;
	56
5052de8d	57	rc = rpmsg_send(qdev->channel, skb->data, skb->len);
bdabad3e CC	58
	59	out:
	60	if (rc)
	61	kfree_skb(skb);
	62	else
	63	consume_skb(skb);
	64	return rc;
	65	}
	66
5052de8d	67	static int qcom_smd_qrtr_probe(struct rpmsg_device *rpdev)
bdabad3e CC	68	{
	69	struct qrtr_smd_dev *qdev;
	70	int rc;
	71
5052de8d	72	qdev = devm_kzalloc(&rpdev->dev, sizeof(*qdev), GFP_KERNEL);
bdabad3e CC	73	if (!qdev)
	74	return -ENOMEM;
	75
5052de8d BA	76	qdev->channel = rpdev->ept;
5052de8d BA	77	qdev->dev = &rpdev->dev;
bdabad3e CC	78	qdev->ep.xmit = qcom_smd_qrtr_send;
	79
	80	rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
	81	if (rc)
	82	return rc;
	83
5052de8d	84	dev_set_drvdata(&rpdev->dev, qdev);
bdabad3e	85
5052de8d	86	dev_dbg(&rpdev->dev, "Qualcomm SMD QRTR driver probed\n");
bdabad3e CC	87
	88	return 0;
	89	}
	90
5052de8d	91	static void qcom_smd_qrtr_remove(struct rpmsg_device *rpdev)
bdabad3e	92	{
5052de8d	93	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
bdabad3e CC	94
	95	qrtr_endpoint_unregister(&qdev->ep);
	96
5052de8d	97	dev_set_drvdata(&rpdev->dev, NULL);
bdabad3e CC	98	}
bdabad3e CC	99
5052de8d	100	static const struct rpmsg_device_id qcom_smd_qrtr_smd_match[] = {
bdabad3e CC	101	{ "IPCRTR" },
	102	{}
	103	};
	104
5052de8d	105	static struct rpmsg_driver qcom_smd_qrtr_driver = {
bdabad3e CC	106	.probe = qcom_smd_qrtr_probe,
	107	.remove = qcom_smd_qrtr_remove,
	108	.callback = qcom_smd_qrtr_callback,
5052de8d BA	109	.id_table = qcom_smd_qrtr_smd_match,
5052de8d BA	110	.drv = {
bdabad3e	111	.name = "qcom_smd_qrtr",
bdabad3e CC	112	},
	113	};
	114
5052de8d	115	module_rpmsg_driver(qcom_smd_qrtr_driver);
bdabad3e CC	116
	117	MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
	118	MODULE_LICENSE("GPL v2");