1 /*
2 * Copyright (C) 2021 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 #define LOG_TAG "android.hardware.tv.cec@1.0-impl"
17
18 #include <android-base/logging.h>
19 #include <errno.h>
20 #include <linux/cec.h>
21 #include <linux/ioctl.h>
22 #include <sys/eventfd.h>
23 #include <algorithm>
24
25 #include "HdmiCecPort.h"
26
27 namespace android {
28 namespace hardware {
29 namespace tv {
30 namespace cec {
31 namespace V1_0 {
32 namespace implementation {
33
HdmiCecPort(unsigned int portId)34 HdmiCecPort::HdmiCecPort(unsigned int portId) {
35 mPortId = portId;
36 mCecFd = -1;
37 mExitFd = -1;
38 }
39
~HdmiCecPort()40 HdmiCecPort::~HdmiCecPort() {
41 release();
42 }
43
44 // Initialise the cec file descriptor
init(const char * path)45 Return<Result> HdmiCecPort::init(const char* path) {
46 mCecFd = open(path, O_RDWR);
47 if (mCecFd < 0) {
48 LOG(ERROR) << "Failed to open " << path << ", Error = " << strerror(errno);
49 return Result::FAILURE_NOT_SUPPORTED;
50 }
51 mExitFd = eventfd(0, EFD_NONBLOCK);
52 if (mExitFd < 0) {
53 LOG(ERROR) << "Failed to open eventfd, Error = " << strerror(errno);
54 release();
55 return Result::FAILURE_NOT_SUPPORTED;
56 }
57
58 // Ensure the CEC device supports required capabilities
59 struct cec_caps caps = {};
60 int ret = ioctl(mCecFd, CEC_ADAP_G_CAPS, &caps);
61 if (ret) {
62 LOG(ERROR) << "Unable to query cec adapter capabilities, Error = " << strerror(errno);
63 release();
64 return Result::FAILURE_NOT_SUPPORTED;
65 }
66
67 if (!(caps.capabilities & (CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT | CEC_CAP_PASSTHROUGH))) {
68 LOG(ERROR) << "Wrong cec adapter capabilities " << caps.capabilities;
69 release();
70 return Result::FAILURE_NOT_SUPPORTED;
71 }
72
73 uint32_t mode = CEC_MODE_INITIATOR | CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
74 ret = ioctl(mCecFd, CEC_S_MODE, &mode);
75 if (ret) {
76 LOG(ERROR) << "Unable to set initiator mode, Error = " << strerror(errno);
77 release();
78 return Result::FAILURE_NOT_SUPPORTED;
79 }
80 return Result::SUCCESS;
81 }
82
release()83 Return<void> HdmiCecPort::release() {
84 if (mExitFd > 0) {
85 uint64_t tmp = 1;
86 write(mExitFd, &tmp, sizeof(tmp));
87 }
88 if (mExitFd > 0) {
89 close(mExitFd);
90 }
91 if (mCecFd > 0) {
92 close(mCecFd);
93 }
94 return Void();
95 }
96 } // namespace implementation
97 } // namespace V1_0
98 } // namespace cec
99 } // namespace tv
100 } // namespace hardware
101 } // namespace android
102