1 /*
2 * Copyright 2019 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 #include "l2cap/le/internal/fixed_channel_impl.h"
18
19 #include <bluetooth/log.h>
20
21 #include <unordered_map>
22
23 #include "hci/acl_manager/le_acl_connection.h"
24 #include "l2cap/cid.h"
25 #include "l2cap/le/internal/link.h"
26 #include "os/handler.h"
27 #include "os/log.h"
28
29 namespace bluetooth {
30 namespace l2cap {
31 namespace le {
32 namespace internal {
33
GetRole() const34 hci::Role FixedChannelImpl::GetRole() const {
35 return link_->GetRole();
36 }
37
GetAclConnection() const38 hci::acl_manager::LeAclConnection* FixedChannelImpl::GetAclConnection() const {
39 return link_->GetAclConnection();
40 }
41
FixedChannelImpl(Cid cid,Link * link,os::Handler * l2cap_handler)42 FixedChannelImpl::FixedChannelImpl(Cid cid, Link* link, os::Handler* l2cap_handler)
43 : cid_(cid), device_(link->GetDevice()), link_(link), l2cap_handler_(l2cap_handler) {
44 log::assert_that(
45 cid_ >= kFirstFixedChannel && cid_ <= kLastFixedChannel, "Invalid cid: {}", cid_);
46 log::assert_that(link_ != nullptr, "assert failed: link_ != nullptr");
47 log::assert_that(l2cap_handler_ != nullptr, "assert failed: l2cap_handler_ != nullptr");
48 }
49
RegisterOnCloseCallback(os::Handler * user_handler,FixedChannel::OnCloseCallback on_close_callback)50 void FixedChannelImpl::RegisterOnCloseCallback(os::Handler* user_handler,
51 FixedChannel::OnCloseCallback on_close_callback) {
52 log::assert_that(user_handler_ == nullptr, "OnCloseCallback can only be registered once");
53 // If channel is already closed, call the callback immediately without saving it
54 if (closed_) {
55 user_handler->Post(common::BindOnce(std::move(on_close_callback), close_reason_));
56 return;
57 }
58 user_handler_ = user_handler;
59 on_close_callback_ = std::move(on_close_callback);
60 }
61
OnClosed(hci::ErrorCode status)62 void FixedChannelImpl::OnClosed(hci::ErrorCode status) {
63 log::assert_that(
64 !closed_,
65 "Device {} Cid 0x{:x} closed twice, old status 0x{:x}, new status 0x{:x}",
66 ADDRESS_TO_LOGGABLE_CSTR(device_),
67 cid_,
68 static_cast<int>(close_reason_),
69 static_cast<int>(status));
70 closed_ = true;
71 close_reason_ = status;
72 acquired_ = false;
73 link_ = nullptr;
74 l2cap_handler_ = nullptr;
75 if (user_handler_ == nullptr) {
76 return;
77 }
78 // On close callback can only be called once
79 user_handler_->Post(common::BindOnce(std::move(on_close_callback_), status));
80 user_handler_ = nullptr;
81 on_close_callback_.Reset();
82 }
83
Acquire()84 void FixedChannelImpl::Acquire() {
85 log::assert_that(
86 user_handler_ != nullptr, "Must register OnCloseCallback before calling any methods");
87 if (closed_) {
88 log::warn("{} is already closed", ToLoggableStr(*this));
89 log::assert_that(!acquired_, "assert failed: !acquired_");
90 return;
91 }
92 if (acquired_) {
93 log::info("{} was already acquired", ToLoggableStr(*this));
94 return;
95 }
96 acquired_ = true;
97 link_->RefreshRefCount();
98 }
99
Release()100 void FixedChannelImpl::Release() {
101 log::assert_that(
102 user_handler_ != nullptr, "Must register OnCloseCallback before calling any methods");
103 if (closed_) {
104 log::warn("{} is already closed", ToLoggableStr(*this));
105 log::assert_that(!acquired_, "assert failed: !acquired_");
106 return;
107 }
108 if (!acquired_) {
109 log::info("{} was already released", ToLoggableStr(*this));
110 return;
111 }
112 acquired_ = false;
113 link_->RefreshRefCount();
114 }
115
GetCid() const116 Cid FixedChannelImpl::GetCid() const {
117 return cid_;
118 }
119
GetRemoteCid() const120 Cid FixedChannelImpl::GetRemoteCid() const {
121 return cid_;
122 }
123
GetLinkOptions()124 LinkOptions* FixedChannelImpl::GetLinkOptions() {
125 return link_->GetLinkOptions();
126 }
127
128 } // namespace internal
129 } // namespace le
130 } // namespace l2cap
131 } // namespace bluetooth
132