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1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.hardware.bluetooth@1.0;
18
19import IBluetoothHciCallbacks;
20
21/**
22 * The Host Controller Interface (HCI) is the layer defined by the Bluetooth
23 * specification between the software that runs on the host and the Bluetooth
24 * controller chip. This boundary is the natural choice for a Hardware
25 * Abstraction Layer (HAL). Dealing only in HCI packets and events simplifies
26 * the stack and abstracts away power management, initialization, and other
27 * implementation-specific details related to the hardware.
28 */
29
30interface IBluetoothHci {
31    /**
32     * Initialize the underlying HCI interface.
33     *
34     * This method should be used to initialize any hardware interfaces
35     * required to communicate with the Bluetooth hardware in the
36     * device.
37     *
38     * The |oninitializationComplete| callback must be invoked in response
39     * to this function to indicate success before any other function
40     * (sendHciCommand, sendAclData, * sendScoData) is invoked on this
41     * interface.
42     *
43     * @param callback implements IBluetoothHciCallbacks which will
44     *    receive callbacks when incoming HCI packets are received
45     *    from the controller to be sent to the host.
46     */
47    @entry
48    @callflow(next={"sendHciCommand", "sendAclData", "sendScoData", "close"})
49    initialize(IBluetoothHciCallbacks callback);
50
51    /**
52     * Send an HCI command (as specified in the Bluetooth Specification
53     * V4.2, Vol 2, Part 5, Section 5.4.1) to the Bluetooth controller.
54     * Commands must be executed in order.
55     *
56     * @param command is the HCI command to be sent
57     */
58    @callflow(next={"sendHciCommand", "sendAclData", "sendScoData", "close"})
59    sendHciCommand(HciPacket command);
60
61    /**
62     * Send an HCI ACL data packet (as specified in the Bluetooth Specification
63     * V4.2, Vol 2, Part 5, Section 5.4.2) to the Bluetooth controller.
64     * Packets must be processed in order.
65     * @param data HCI data packet to be sent
66     */
67    @callflow(next={"sendHciCommand", "sendAclData", "sendScoData", "close"})
68    sendAclData(HciPacket data);
69
70    /**
71     * Send an SCO data packet (as specified in the Bluetooth Specification
72     * V4.2, Vol 2, Part 5, Section 5.4.3) to the Bluetooth controller.
73     * Packets must be processed in order.
74     * @param data HCI data packet to be sent
75     */
76    @callflow(next={"sendHciCommand", "sendAclData", "sendScoData", "close"})
77    sendScoData(HciPacket data);
78
79    /**
80     * Close the HCI interface
81     */
82    @exit
83    close();
84};
85