[linux-block.git] / net / qrtr / mhi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
 */

#include <linux/mhi.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <net/sock.h>

#include "qrtr.h"

struct qrtr_mhi_dev {
	struct qrtr_endpoint ep;
	struct mhi_device *mhi_dev;
	struct device *dev;
};

/* From MHI to QRTR */
static void qcom_mhi_qrtr_dl_callback(struct mhi_device *mhi_dev,
				      struct mhi_result *mhi_res)
{
	struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
	int rc;

	if (!qdev || mhi_res->transaction_status)
		return;

	rc = qrtr_endpoint_post(&qdev->ep, mhi_res->buf_addr,
				mhi_res->bytes_xferd);
	if (rc == -EINVAL)
		dev_err(qdev->dev, "invalid ipcrouter packet\n");
}

/* From QRTR to MHI */
static void qcom_mhi_qrtr_ul_callback(struct mhi_device *mhi_dev,
				      struct mhi_result *mhi_res)
{
	struct sk_buff *skb = mhi_res->buf_addr;

	if (skb->sk)
		sock_put(skb->sk);
	consume_skb(skb);
}

/* Send data over MHI */
static int qcom_mhi_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
{
	struct qrtr_mhi_dev *qdev = container_of(ep, struct qrtr_mhi_dev, ep);
	int rc;

	rc = skb_linearize(skb);
	if (rc)
		goto free_skb;

	rc = mhi_queue_skb(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len,
			   MHI_EOT);
	if (rc)
		goto free_skb;

	if (skb->sk)
		sock_hold(skb->sk);

	return rc;

free_skb:
	kfree_skb(skb);

	return rc;
}

static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev,
			       const struct mhi_device_id *id)
{
	struct qrtr_mhi_dev *qdev;
	int rc;

	/* start channels */
	rc = mhi_prepare_for_transfer(mhi_dev);
	if (rc)
		return rc;

	qdev = devm_kzalloc(&mhi_dev->dev, sizeof(*qdev), GFP_KERNEL);
	if (!qdev)
		return -ENOMEM;

	qdev->mhi_dev = mhi_dev;
	qdev->dev = &mhi_dev->dev;
	qdev->ep.xmit = qcom_mhi_qrtr_send;

	dev_set_drvdata(&mhi_dev->dev, qdev);
	rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
	if (rc)
		return rc;

	dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n");

	return 0;
}

static void qcom_mhi_qrtr_remove(struct mhi_device *mhi_dev)
{
	struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);

	qrtr_endpoint_unregister(&qdev->ep);
	mhi_unprepare_from_transfer(mhi_dev);
	dev_set_drvdata(&mhi_dev->dev, NULL);
}

static const struct mhi_device_id qcom_mhi_qrtr_id_table[] = {
	{ .chan = "IPCR" },
	{}
};
MODULE_DEVICE_TABLE(mhi, qcom_mhi_qrtr_id_table);

static struct mhi_driver qcom_mhi_qrtr_driver = {
	.probe = qcom_mhi_qrtr_probe,
	.remove = qcom_mhi_qrtr_remove,
	.dl_xfer_cb = qcom_mhi_qrtr_dl_callback,
	.ul_xfer_cb = qcom_mhi_qrtr_ul_callback,
	.id_table = qcom_mhi_qrtr_id_table,
	.driver = {
		.name = "qcom_mhi_qrtr",
	},
};

module_mhi_driver(qcom_mhi_qrtr_driver);

MODULE_AUTHOR("Chris Lew <clew@codeaurora.org>");
MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
MODULE_DESCRIPTION("Qualcomm IPC-Router MHI interface driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
6e728f32 MS	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
	4	*/
	5
	6	#include <linux/mhi.h>
	7	#include <linux/mod_devicetable.h>
	8	#include <linux/module.h>
	9	#include <linux/skbuff.h>
	10	#include <net/sock.h>
	11
	12	#include "qrtr.h"
	13
	14	struct qrtr_mhi_dev {
	15	struct qrtr_endpoint ep;
	16	struct mhi_device *mhi_dev;
	17	struct device *dev;
	18	};
	19
	20	/* From MHI to QRTR */
	21	static void qcom_mhi_qrtr_dl_callback(struct mhi_device *mhi_dev,
	22	struct mhi_result *mhi_res)
	23	{
	24	struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
	25	int rc;
	26
	27	if (!qdev \|\| mhi_res->transaction_status)
	28	return;
	29
	30	rc = qrtr_endpoint_post(&qdev->ep, mhi_res->buf_addr,
	31	mhi_res->bytes_xferd);
	32	if (rc == -EINVAL)
	33	dev_err(qdev->dev, "invalid ipcrouter packet\n");
	34	}
	35
	36	/* From QRTR to MHI */
	37	static void qcom_mhi_qrtr_ul_callback(struct mhi_device *mhi_dev,
	38	struct mhi_result *mhi_res)
	39	{
	40	struct sk_buff *skb = mhi_res->buf_addr;
	41
	42	if (skb->sk)
	43	sock_put(skb->sk);
	44	consume_skb(skb);
	45	}
	46
	47	/* Send data over MHI */
	48	static int qcom_mhi_qrtr_send(struct qrtr_endpoint ep, struct sk_buff skb)
	49	{
	50	struct qrtr_mhi_dev *qdev = container_of(ep, struct qrtr_mhi_dev, ep);
	51	int rc;
	52
	53	rc = skb_linearize(skb);
	54	if (rc)
	55	goto free_skb;
	56
	57	rc = mhi_queue_skb(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len,
	58	MHI_EOT);
	59	if (rc)
	60	goto free_skb;
	61
	62	if (skb->sk)
	63	sock_hold(skb->sk);
	64
65	return rc;
66
67	free_skb:
68	kfree_skb(skb);
69
70	return rc;
71	}
72
73	static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev,
74	const struct mhi_device_id *id)
75	{
76	struct qrtr_mhi_dev *qdev;
77	int rc;
78
a2e2cc0d LP	79	/* start channels */
	80	rc = mhi_prepare_for_transfer(mhi_dev);
	81	if (rc)
	82	return rc;
	83
6e728f32 MS	84	qdev = devm_kzalloc(&mhi_dev->dev, sizeof(*qdev), GFP_KERNEL);
	85	if (!qdev)
	86	return -ENOMEM;
	87
	88	qdev->mhi_dev = mhi_dev;
	89	qdev->dev = &mhi_dev->dev;
	90	qdev->ep.xmit = qcom_mhi_qrtr_send;
	91
	92	dev_set_drvdata(&mhi_dev->dev, qdev);
	93	rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
	94	if (rc)
	95	return rc;
	96
	97	dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n");
	98
	99	return 0;
	100	}
	101
	102	static void qcom_mhi_qrtr_remove(struct mhi_device *mhi_dev)
	103	{
	104	struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
	105
	106	qrtr_endpoint_unregister(&qdev->ep);
2ca7e30d	107	mhi_unprepare_from_transfer(mhi_dev);
6e728f32 MS	108	dev_set_drvdata(&mhi_dev->dev, NULL);
	109	}
	110
	111	static const struct mhi_device_id qcom_mhi_qrtr_id_table[] = {
	112	{ .chan = "IPCR" },
	113	{}
	114	};
	115	MODULE_DEVICE_TABLE(mhi, qcom_mhi_qrtr_id_table);
	116
	117	static struct mhi_driver qcom_mhi_qrtr_driver = {
	118	.probe = qcom_mhi_qrtr_probe,
	119	.remove = qcom_mhi_qrtr_remove,
	120	.dl_xfer_cb = qcom_mhi_qrtr_dl_callback,
	121	.ul_xfer_cb = qcom_mhi_qrtr_ul_callback,
	122	.id_table = qcom_mhi_qrtr_id_table,
	123	.driver = {
	124	.name = "qcom_mhi_qrtr",
	125	},
	126	};
	127
	128	module_mhi_driver(qcom_mhi_qrtr_driver);
	129
	130	MODULE_AUTHOR("Chris Lew <clew@codeaurora.org>");
	131	MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
	132	MODULE_DESCRIPTION("Qualcomm IPC-Router MHI interface driver");
	133	MODULE_LICENSE("GPL v2");