DevicesFactory.cpp revision f247b8df085d6b2a50f981a062f9d376148acd5b 
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}
43
44// static
45int DevicesFactory::loadAudioInterface(const char *if_name, audio_hw_device_t **dev)
46{
47    const hw_module_t *mod;
48    int rc;
49
50    rc = hw_get_module_by_class(AUDIO_HARDWARE_MODULE_ID, if_name, &mod);
51    if (rc) {
52        ALOGE("%s couldn't load audio hw module %s.%s (%s)", __func__,
53                AUDIO_HARDWARE_MODULE_ID, if_name, strerror(-rc));
54        goto out;
55    }
56    rc = audio_hw_device_open(mod, dev);
57    if (rc) {
58        ALOGE("%s couldn't open audio hw device in %s.%s (%s)", __func__,
59                AUDIO_HARDWARE_MODULE_ID, if_name, strerror(-rc));
60        goto out;
61    }
62    if ((*dev)->common.version < AUDIO_DEVICE_API_VERSION_MIN) {
63        ALOGE("%s wrong audio hw device version %04x", __func__, (*dev)->common.version);
64        rc = -EINVAL;
65        audio_hw_device_close(*dev);
66        goto out;
67    }
68    return OK;
69
70out:
71    *dev = NULL;
72    return rc;
73}
74
75// Methods from ::android::hardware::audio::V2_0::IDevicesFactory follow.
76Return<void> DevicesFactory::openDevice(IDevicesFactory::Device device, openDevice_cb _hidl_cb)  {
77    audio_hw_device_t *halDevice;
78    int halStatus = loadAudioInterface(deviceToString(device), &halDevice);
79    Result retval(Result::OK);
80    sp<IDevice> result;
81    if (halStatus == OK) {
82        if (device == IDevicesFactory::Device::PRIMARY) {
83            result = new PrimaryDevice(halDevice);
84        } else {
85            result = new ::android::hardware::audio::V2_0::implementation::Device(halDevice);
86        }
87    } else if (halStatus == -EINVAL) {
88        retval = Result::NOT_INITIALIZED;
89    } else {
90        retval = Result::INVALID_ARGUMENTS;
91    }
92    _hidl_cb(retval, result);
93    return Void();
94}
95
96IDevicesFactory* HIDL_FETCH_IDevicesFactory(const char* /* name */) {
97    return new DevicesFactory();
98}
99
100}  // namespace implementation
101}  // namespace V2_0
102}  // namespace audio
103}  // namespace hardware
104}  // namespace android
105