DevicesFactory.cpp revision 8604a738a79d9caf8b57773a7bcc2ef99a8a624d 
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
17#define LOG_TAG "DevicesFactoryHAL"
18
19#include <string.h>
20
21#include <android/log.h>
22
23#include "Device.h"
24#include "DevicesFactory.h"
25#include "PrimaryDevice.h"
26
27namespace android {
28namespace hardware {
29namespace audio {
30namespace V2_0 {
31namespace implementation {
32
33// static
34const char* DevicesFactory::deviceToString(IDevicesFactory::Device device) {
35    switch (device) {
36        case IDevicesFactory::Device::PRIMARY: return AUDIO_HARDWARE_MODULE_ID_PRIMARY;
37        case IDevicesFactory::Device::A2DP: return AUDIO_HARDWARE_MODULE_ID_A2DP;
38        case IDevicesFactory::Device::USB: return AUDIO_HARDWARE_MODULE_ID_USB;
39        case IDevicesFactory::Device::R_SUBMIX: return AUDIO_HARDWARE_MODULE_ID_REMOTE_SUBMIX;
40        case IDevicesFactory::Device::STUB: return AUDIO_HARDWARE_MODULE_ID_STUB;
41    }
42    return nullptr;
43}
44
45// static
46int DevicesFactory::loadAudioInterface(const char *if_name, audio_hw_device_t **dev)
47{
48    const hw_module_t *mod;
49    int rc;
50
51    rc = hw_get_module_by_class(AUDIO_HARDWARE_MODULE_ID, if_name, &mod);
52    if (rc) {
53        ALOGE("%s couldn't load audio hw module %s.%s (%s)", __func__,
54                AUDIO_HARDWARE_MODULE_ID, if_name, strerror(-rc));
55        goto out;
56    }
57    rc = audio_hw_device_open(mod, dev);
58    if (rc) {
59        ALOGE("%s couldn't open audio hw device in %s.%s (%s)", __func__,
60                AUDIO_HARDWARE_MODULE_ID, if_name, strerror(-rc));
61        goto out;
62    }
63    if ((*dev)->common.version < AUDIO_DEVICE_API_VERSION_MIN) {
64        ALOGE("%s wrong audio hw device version %04x", __func__, (*dev)->common.version);
65        rc = -EINVAL;
66        audio_hw_device_close(*dev);
67        goto out;
68    }
69    return OK;
70
71out:
72    *dev = NULL;
73    return rc;
74}
75
76// Methods from ::android::hardware::audio::V2_0::IDevicesFactory follow.
77Return<void> DevicesFactory::openDevice(IDevicesFactory::Device device, openDevice_cb _hidl_cb)  {
78    audio_hw_device_t *halDevice;
79    Result retval(Result::INVALID_ARGUMENTS);
80    sp<IDevice> result;
81    const char* moduleName = deviceToString(device);
82    if (moduleName != nullptr) {
83        int halStatus = loadAudioInterface(moduleName, &halDevice);
84        if (halStatus == OK) {
85            if (device == IDevicesFactory::Device::PRIMARY) {
86                result = new PrimaryDevice(halDevice);
87            } else {
88                result = new ::android::hardware::audio::V2_0::implementation::
89                    Device(halDevice);
90            }
91            retval = Result::OK;
92        } else if (halStatus == -EINVAL) {
93            retval = Result::NOT_INITIALIZED;
94        }
95    }
96    _hidl_cb(retval, result);
97    return Void();
98}
99
100IDevicesFactory* HIDL_FETCH_IDevicesFactory(const char* /* name */) {
101    return new DevicesFactory();
102}
103
104}  // namespace implementation
105}  // namespace V2_0
106}  // namespace audio
107}  // namespace hardware
108}  // namespace android
109