Revert "legacy: Delete hci/include/userial.h" am: 53d096ec

/******************************************************************************

 *

 *  Copyright 2009-2012 Broadcom 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.

 *

 ******************************************************************************/

// This module manages the serial port over which HCI commands

// and data are sent/received.

#pragma once

#include <stdbool.h>

#include <stdint.h>

typedef enum {

  USERIAL_PORT_1,

  USERIAL_PORT_2,

  USERIAL_PORT_3,

  USERIAL_PORT_4,

  USERIAL_PORT_5,

  USERIAL_PORT_6,

  USERIAL_PORT_7,

  USERIAL_PORT_8,

  USERIAL_PORT_9,

  USERIAL_PORT_10,

  USERIAL_PORT_11,

  USERIAL_PORT_12,

  USERIAL_PORT_13,

  USERIAL_PORT_14,

  USERIAL_PORT_15,

  USERIAL_PORT_16,

  USERIAL_PORT_17,

  USERIAL_PORT_18,

} userial_port_t;

// Initializes the userial module. This function should only be called once.

// It returns true if the module was initialized, false if there was an error.

bool userial_init(void);

// Opens the given serial port. Returns true if successful, false otherwise.

// Once this function is called, the userial module will begin producing

// buffers from data read off the serial port. If you wish to pause the

// production of buffers, call |userial_pause_reading|. You can then resume

// by calling |userial_resume_reading|. This function returns true if the

// serial port was successfully opened and buffer production has started. It

// returns false if there was an error.

bool userial_open(userial_port_t port);

void userial_close(void);

void userial_close_reader(void);

// Reads a maximum of |len| bytes from the serial port into |p_buffer|.

// This function returns the number of bytes actually read, which may be

// less than |len|. This function will not block.

uint16_t userial_read(uint16_t msg_id, uint8_t* p_buffer, uint16_t len);

// Writes a maximum of |len| bytes from |p_data| to the serial port.

// This function returns the number of bytes actually written, which may be

// less than |len|. This function may block.

uint16_t userial_write(uint16_t msg_id, const uint8_t* p_data, uint16_t len);