net: iosm: wwan port control device

// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (C) 2020-21 Intel Corporation.

 */

#include "iosm_ipc_chnl_cfg.h"

#include "iosm_ipc_imem_ops.h"

#include "iosm_ipc_port.h"

/* open logical channel for control communication */

static int ipc_port_ctrl_start(struct wwan_port *port)

{

	struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);

	int ret = 0;

	ipc_port->channel = ipc_imem_sys_port_open(ipc_port->ipc_imem,

						   ipc_port->chl_id,

						   IPC_HP_CDEV_OPEN);

	if (!ipc_port->channel)

		ret = -EIO;

	return ret;

}

/* close logical channel */

static void ipc_port_ctrl_stop(struct wwan_port *port)

{

	struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);

	ipc_imem_sys_cdev_close(ipc_port);

}

/* transfer control data to modem */

static int ipc_port_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)

{

	struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);

	return ipc_imem_sys_cdev_write(ipc_port, skb);

}

static const struct wwan_port_ops ipc_wwan_ctrl_ops = {

	.start = ipc_port_ctrl_start,

	.stop = ipc_port_ctrl_stop,

	.tx = ipc_port_ctrl_tx,

};

/* Port init func */

struct iosm_cdev *ipc_port_init(struct iosm_imem *ipc_imem,

				struct ipc_chnl_cfg ipc_port_cfg)

{

	struct iosm_cdev *ipc_port = kzalloc(sizeof(*ipc_port), GFP_KERNEL);

	enum wwan_port_type port_type = ipc_port_cfg.wwan_port_type;

	enum ipc_channel_id chl_id = ipc_port_cfg.id;

	if (!ipc_port)

		return NULL;

	ipc_port->dev = ipc_imem->dev;

	ipc_port->pcie = ipc_imem->pcie;

	ipc_port->port_type = port_type;

	ipc_port->chl_id = chl_id;

	ipc_port->ipc_imem = ipc_imem;

	ipc_port->iosm_port = wwan_create_port(ipc_port->dev, port_type,

					       &ipc_wwan_ctrl_ops, ipc_port);

	return ipc_port;

}

/* Port deinit func */

void ipc_port_deinit(struct iosm_cdev *port[])

{

	struct iosm_cdev *ipc_port;

	u8 ctrl_chl_nr;

	for (ctrl_chl_nr = 0; ctrl_chl_nr < IPC_MEM_MAX_CHANNELS;

	     ctrl_chl_nr++) {

		if (port[ctrl_chl_nr]) {

			ipc_port = port[ctrl_chl_nr];

			wwan_remove_port(ipc_port->iosm_port);

			kfree(ipc_port);

		}

	}

}

/* SPDX-License-Identifier: GPL-2.0-only

 *

 * Copyright (C) 2020-21 Intel Corporation.

 */

#ifndef IOSM_IPC_PORT_H

#define IOSM_IPC_PORT_H

#include <linux/wwan.h>

#include "iosm_ipc_imem_ops.h"

/**

 * struct iosm_cdev - State of the char driver layer.

 * @iosm_port:		Pointer of type wwan_port

 * @ipc_imem:		imem instance

 * @dev:		Pointer to device struct

 * @pcie:		PCIe component

 * @port_type:		WWAN port type

 * @channel:		Channel instance

 * @chl_id:		Channel Indentifier

 */

struct iosm_cdev {

	struct wwan_port *iosm_port;

	struct iosm_imem *ipc_imem;

	struct device *dev;

	struct iosm_pcie *pcie;

	enum wwan_port_type port_type;

	struct ipc_mem_channel *channel;

	enum ipc_channel_id chl_id;

};

/**

 * ipc_port_init - Allocate IPC port & register to wwan subsystem for AT/MBIM

 *		   communication.

 * @ipc_imem:		Pointer to iosm_imem structure

 * @ipc_port_cfg:	IPC Port Config

 *

 * Returns: 0 on success & NULL on failure

 */

struct iosm_cdev *ipc_port_init(struct iosm_imem *ipc_imem,

				struct ipc_chnl_cfg ipc_port_cfg);

/**

 * ipc_port_deinit - Free IPC port & unregister port with wwan subsystem.

 * @ipc_port:	Array of pointer to the ipc port data-struct

 */

void ipc_port_deinit(struct iosm_cdev *ipc_port[]);

#endif