DevicesFactory.cpp revision 10548295023bee99108e418499aff09fe578211e 
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 <utils/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    }
41}
42
43// static
44int DevicesFactory::loadAudioInterface(const char *if_name, audio_hw_device_t **dev)
45{
46    const hw_module_t *mod;
47    int rc;
48
49    rc = hw_get_module_by_class(AUDIO_HARDWARE_MODULE_ID, if_name, &mod);
50    if (rc) {
51        ALOGE("%s couldn't load audio hw module %s.%s (%s)", __func__,
52                AUDIO_HARDWARE_MODULE_ID, if_name, strerror(-rc));
53        goto out;
54    }
55    rc = audio_hw_device_open(mod, dev);
56    if (rc) {
57        ALOGE("%s couldn't open audio hw device in %s.%s (%s)", __func__,
58                AUDIO_HARDWARE_MODULE_ID, if_name, strerror(-rc));
59        goto out;
60    }
61    if ((*dev)->common.version < AUDIO_DEVICE_API_VERSION_MIN) {
62        ALOGE("%s wrong audio hw device version %04x", __func__, (*dev)->common.version);
63        rc = -EINVAL;
64        audio_hw_device_close(*dev);
65        goto out;
66    }
67    return OK;
68
69out:
70    *dev = NULL;
71    return rc;
72}
73
74// Methods from ::android::hardware::audio::V2_0::IDevicesFactory follow.
75Return<void> DevicesFactory::openDevice(IDevicesFactory::Device device, openDevice_cb _hidl_cb)  {
76    audio_hw_device_t *halDevice;
77    int halStatus = loadAudioInterface(deviceToString(device), &halDevice);
78    Result retval(Result::OK);
79    sp<IDevice> result;
80    if (halStatus == OK) {
81        if (device == IDevicesFactory::Device::PRIMARY) {
82            result = new PrimaryDevice(halDevice);
83        } else {
84            result = new ::android::hardware::audio::V2_0::implementation::Device(halDevice);
85        }
86    } else if (halStatus == -EINVAL) {
87        retval = Result::NOT_INITIALIZED;
88    } else {
89        retval = Result::INVALID_ARGUMENTS;
90    }
91    _hidl_cb(retval, result);
92    return Void();
93}
94
95IDevicesFactory* HIDL_FETCH_IDevicesFactory(const char* /* name */) {
96    return new DevicesFactory();
97}
98
99}  // namespace implementation
100}  // namespace V2_0
101}  // namespace audio
102}  // namespace hardware
103}  // namespace android
104