/* hci_userchan.c - HCI user channel Bluetooth handling */

/*
 * Copyright (c) 2015-2016 Intel Corporation
 *
 * 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.
 */

#include <errno.h>
#include <atomic.h>

#include <bluetooth/hci_driver.h>
#include <bluetooth/log.h>

#include "monitor.h"

static struct nano_fifo *raw_rx;

/* ACL incoming buffers */
static struct nano_fifo avail_acl_in;
static NET_BUF_POOL(acl_in_pool, CONFIG_BLUETOOTH_ACL_IN_COUNT,
		    BT_BUF_ACL_IN_SIZE, &avail_acl_in, NULL,
		    sizeof(uint8_t));

/* HCI event buffers */
static struct nano_fifo avail_hci_evt;
static NET_BUF_POOL(hci_evt_pool, CONFIG_BLUETOOTH_HCI_EVT_COUNT,
		    BT_BUF_EVT_SIZE, &avail_hci_evt, NULL,
		    sizeof(uint8_t));

static struct bt_dev {
	/* Registered HCI driver */
	struct bt_hci_driver	*drv;
} bt_dev;

int bt_hci_driver_register(struct bt_hci_driver *drv)
{
	if (bt_dev.drv) {
		return -EALREADY;
	}

	if (!drv->open || !drv->send) {
		return -EINVAL;
	}

	bt_dev.drv = drv;

	BT_DBG("Registered %s", drv->name ? drv->name : "");

	bt_monitor_new_index(BT_MONITOR_TYPE_PRIMARY, drv->bus,
			     BT_ADDR_ANY, drv->name ? drv->name : "bt0");

	return 0;
}

void bt_hci_driver_unregister(struct bt_hci_driver *drv)
{
	bt_dev.drv = NULL;
}

struct net_buf *bt_buf_get_evt(uint8_t opcode)
{
	struct net_buf *buf;

	buf = net_buf_get(&avail_hci_evt, 0);
	if (buf) {
		bt_buf_set_type(buf, BT_BUF_EVT);
	}

	return buf;
}

struct net_buf *bt_buf_get_acl(void)
{
	struct net_buf *buf;

	buf = net_buf_get(&avail_acl_in, 0);
	if (buf) {
		bt_buf_set_type(buf, BT_BUF_ACL_IN);
	}

	return buf;
}

int bt_recv(struct net_buf *buf)
{
	BT_DBG("buf %p len %u", buf, buf->len);

	bt_monitor_send(bt_monitor_opcode(buf), buf->data, buf->len);

	/* Queue to RAW rx queue */
	net_buf_put(raw_rx, buf);

	return 0;
}

int bt_send(struct net_buf *buf)
{
	BT_DBG("buf %p len %u", buf, buf->len);

	bt_monitor_send(bt_monitor_opcode(buf), buf->data, buf->len);

	return bt_dev.drv->send(buf);
}

int bt_enable_raw(struct nano_fifo *rx_queue)
{
	struct bt_hci_driver *drv = bt_dev.drv;
	int err;

	BT_DBG("");

	net_buf_pool_init(hci_evt_pool);
	net_buf_pool_init(acl_in_pool);

	raw_rx = rx_queue;

	if (!bt_dev.drv) {
		BT_ERR("No HCI driver registered");
		return -ENODEV;
	}

	err = drv->open();
	if (err) {
		BT_ERR("HCI driver open failed (%d)", err);
		return err;
	}

	BT_INFO("Bluetooth enabled in RAW mode");

	return 0;
}