86 lines
3.2 KiB
C
86 lines
3.2 KiB
C
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/******************************************************************************
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#ifndef _HCI_HAL_H_
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#define _HCI_HAL_H_
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#include <stdbool.h>
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#include <stdint.h>
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#include "bt_types.h"
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typedef enum {
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DATA_TYPE_COMMAND = 1,
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DATA_TYPE_ACL = 2,
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DATA_TYPE_SCO = 3,
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DATA_TYPE_EVENT = 4
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} serial_data_type_t;
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typedef void (*packet_ready_cb)(BT_HDR *packet);
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typedef struct {
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// Called when the HAL detects inbound data.
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// Data |type| may be ACL, SCO, or EVENT.
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// Executes in the context of the thread supplied to |init|.
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packet_ready_cb packet_ready;
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/*
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// Called when the HAL detects inbound astronauts named Dave.
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// HAL will deny all requests to open the pod bay doors after this.
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dave_ready_cb dave_ready;
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*/
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} hci_hal_callbacks_t;
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typedef struct hci_hal_t {
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// Initialize the HAL, with |upper_callbacks| and |upper_thread| to run in the context of.
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//bool (*init)(const hci_hal_callbacks_t *upper_callbacks);
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// Connect to the underlying hardware, and let data start flowing.
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bool (*open)(const hci_hal_callbacks_t *upper_callbacks);
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// Disconnect from the underlying hardware, and close the HAL.
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// "Daisy, Daisy..."
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void (*close)(void);
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// Retrieve up to |max_size| bytes for ACL, SCO, or EVENT data packets into
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// |buffer|, blocking until max_size bytes read if |block| is true.
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// Only guaranteed to be correct in the context of a data_ready callback
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// of the corresponding type.
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//size_t (*read_data)(serial_data_type_t type, uint8_t *buffer, size_t max_size);
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// The upper layer must call this to notify the HAL that it has finished
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// reading a packet of the specified |type|. Underlying implementations that
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// use shared channels for multiple data types depend on this to know when
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// to reinterpret the data stream.
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//void (*packet_finished)(serial_data_type_t type);
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// Transmit COMMAND, ACL, or SCO data packets.
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// |data| may not be NULL. |length| must be greater than zero.
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//
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// IMPORTANT NOTE:
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// Depending on the underlying implementation, the byte right
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// before the beginning of |data| may be borrowed during this call
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// and then restored to its original value.
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// This is safe in the bluetooth context, because there is always a buffer
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// header that prefixes data you're sending.
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uint16_t (*transmit_data)(serial_data_type_t type, uint8_t *data, uint16_t length);
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} hci_hal_t;
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// Gets the correct hal implementation, as compiled for.
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const hci_hal_t *hci_hal_h4_get_interface(void);
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#endif /* _HCI_HAL_H */
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