/******************************************************************************
 *
 *  Copyright (C) 2014 Google, Inc.
 *
 *  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.
 *
 ******************************************************************************/

#ifndef _HCI_LAYER_H_
#define _HCI_LAYER_H_

#include "common/bt_target.h"
#include "stack/bt_types.h"
#include "osi/allocator.h"
#include "osi/osi.h"
#include "osi/future.h"
#include "osi/thread.h"
#include "osi/pkt_queue.h"

///// LEGACY DEFINITIONS /////

/* Message event mask across Host/Controller lib and stack */
#define MSG_EVT_MASK                    0xFF00 /* eq. BT_EVT_MASK */
#define MSG_SUB_EVT_MASK                0x00FF /* eq. BT_SUB_EVT_MASK */

/* Message event ID passed from Host/Controller lib to stack */
#define MSG_HC_TO_STACK_HCI_ERR        0x1300 /* eq. BT_EVT_TO_BTU_HCIT_ERR */
#define MSG_HC_TO_STACK_HCI_ACL        0x1100 /* eq. BT_EVT_TO_BTU_HCI_ACL */
#define MSG_HC_TO_STACK_HCI_SCO        0x1200 /* eq. BT_EVT_TO_BTU_HCI_SCO */
#define MSG_HC_TO_STACK_HCI_EVT        0x1000 /* eq. BT_EVT_TO_BTU_HCI_EVT */
#define MSG_HC_TO_STACK_L2C_SEG_XMIT   0x1900 /* eq. BT_EVT_TO_BTU_L2C_SEG_XMIT */

/* Message event ID passed from stack to vendor lib */
#define MSG_STACK_TO_HC_HCI_ACL        0x2100 /* eq. BT_EVT_TO_LM_HCI_ACL */
#define MSG_STACK_TO_HC_HCI_SCO        0x2200 /* eq. BT_EVT_TO_LM_HCI_SCO */
#define MSG_STACK_TO_HC_HCI_CMD        0x2000 /* eq. BT_EVT_TO_LM_HCI_CMD */

/* Local Bluetooth Controller ID for BR/EDR */
#define LOCAL_BR_EDR_CONTROLLER_ID      0

#define HCI_CMD_MSG_F_VND_FUTURE      (0x01)
#define HCI_CMD_MSG_F_VND_QUEUED      (0x02)
#define HCI_CMD_MSG_F_VND_SENT        (0x04)
///// END LEGACY DEFINITIONS /////

typedef struct hci_hal_t hci_hal_t;
//typedef struct btsnoop_t btsnoop_t;
typedef struct controller_t controller_t;
//typedef struct hci_inject_t hci_inject_t;
typedef struct packet_fragmenter_t packet_fragmenter_t;
//typedef struct vendor_t vendor_t;
//typedef struct low_power_manager_t low_power_manager_t;

//typedef unsigned char * bdaddr_t;
typedef uint16_t command_opcode_t;

/*
typedef enum {
  LPM_DISABLE,
  LPM_ENABLE,
  LPM_WAKE_ASSERT,
  LPM_WAKE_DEASSERT
} low_power_command_t;
*/

typedef void (*command_complete_cb)(BT_HDR *response, void *context);
typedef void (*command_status_cb)(uint8_t status, BT_HDR *command, void *context);

typedef struct hci_t {
    // Send a low power command, if supported and the low power manager is enabled.
    //void (*send_low_power_command)(low_power_command_t command);

    // Do the postload sequence (call after the rest of the BT stack initializes).
    void (*do_postload)(void);

    // Send a command through the HCI layer
    void (*transmit_command)(
        BT_HDR *command,
        command_complete_cb complete_callback,
        command_status_cb status_cb,
        void *context
    );

    future_t *(*transmit_command_futured)(BT_HDR *command);

    // Send some data downward through the HCI layer
    void (*transmit_downward)(uint16_t type, void *data);
} hci_t;

const hci_t *hci_layer_get_interface(void);

int hci_start_up(void);
void hci_shut_down(void);

bool hci_downstream_data_post(uint32_t timeout);

#if (BLE_ADV_REPORT_FLOW_CONTROL == TRUE)
int hci_adv_credits_prep_to_release(uint16_t num);
int hci_adv_credits_try_release(uint16_t num);
int hci_adv_credits_force_release(uint16_t num);
#endif

#endif /* _HCI_LAYER_H_ */
