/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <stdio.h>

#include <lk/list.h>
#include <trusty_ipc.h>
#include <uapi/trusty_uuid.h>

struct ipc_context;
struct ipc_port_context;
struct ipc_channel_context;

/**
 * ipc_connect_handler_t - handler for connect events
 * @parent:      the parent port context of the channel to be created
 * @peer_uuid:   the UUID of the connecting peer
 * @chan_handle: the handle for the connecting channel
 *
 * Returns a reference to an ipc_channel_context with its channel
 * operations initialized.
 */
typedef struct ipc_channel_context* (*ipc_connect_handler_t)(
        struct ipc_port_context* parent,
        const uuid_t* peer_uuid,
        handle_t chan_handle);

/**
 * ipc_msg_handler_t - handler for msg events
 * @context:  the channel context returned from ipc_connect_handler_t
 * @msg:      the received msg buffer
 * @msg_size: the received msg buffer size
 *
 * Returns NO_ERROR on success, error code < 0 on failure.
 * In case of error, the channel is disconnected.
 */
typedef int (*ipc_msg_handler_t)(struct ipc_channel_context* context,
                                 void* msg,
                                 size_t msg_size);

/**
 * ipc_disconnect_handler_t - handler for disconnect events
 * @context: the context to be freed
 *
 * This function must not close the channel handle.
 */
typedef void (*ipc_disconnect_handler_t)(struct ipc_channel_context* context);

typedef void (*ipc_evt_handler_t)(struct ipc_context* context,
                                  const struct uevent* ev);

/**
 * ipc_port_ops
 * @on_connect: required connect handler
 */
struct ipc_port_ops {
    ipc_connect_handler_t on_connect;
};

/**
 * ipc_channel_ops
 * @on_handle_msg: optional msg handler
 * @on_disconnect: required disconnect handler
 */
struct ipc_channel_ops {
    ipc_msg_handler_t on_handle_msg;
    ipc_disconnect_handler_t on_disconnect;
};

struct ipc_context {
    ipc_evt_handler_t evt_handler;
    handle_t handle;
};

struct ipc_channel_context {
    struct ipc_context common;
    struct ipc_channel_ops ops;
    struct list_node node;
};

struct ipc_port_context {
    struct ipc_context common;
    struct ipc_port_ops ops;
    struct list_node channels;
};

/**
 * sync_ipc_send_msg - send IPC message
 * @session:        the session handle
 * @tx_iovecs:      the buffers to send
 * @tx_iovec_count: the count of buffers to send
 * @rx_iovecs:      the buffers to receive
 * @rx_iovec_count: the count of buffers to receive
 */
int sync_ipc_send_msg(handle_t session,
                      struct iovec* tx_iovecs,
                      unsigned int tx_iovec_count,
                      struct iovec* rx_iovecs,
                      unsigned int rx_iovec_count);

int ipc_port_create(struct ipc_port_context* contextp,
                    const char* port_name,
                    size_t queue_size,
                    size_t max_buffer_size,
                    uint32_t flags);
int ipc_port_destroy(struct ipc_port_context* context);
void ipc_loop(void);