1 /******************************************************************************
3 * Copyright (C) 2014 Google, Inc.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 ******************************************************************************/
19 #define LOG_TAG "bt_stack_manager"
21 #include "stack_manager.h"
23 #include <hardware/bluetooth.h>
25 #include "btcore/include/module.h"
26 #include "btcore/include/osi_module.h"
28 #include "btif_common.h"
29 #include "device/include/controller.h"
30 #include "osi/include/log.h"
31 #include "osi/include/osi.h"
32 #include "osi/include/semaphore.h"
33 #include "osi/include/thread.h"
36 #include "btif_config.h"
37 #include "btif_profile_queue.h"
40 static thread_t *management_thread;
42 // If initialized, any of the bluetooth API functions can be called.
43 // (e.g. turning logging on and off, enabling/disabling the stack, etc)
44 static bool stack_is_initialized;
45 // If running, the stack is fully up and able to bluetooth.
46 static bool stack_is_running;
48 static void event_init_stack(void *context);
49 static void event_start_up_stack(void *context);
50 static void event_shut_down_stack(void *context);
51 static void event_clean_up_stack(void *context);
53 static void event_signal_stack_up(void *context);
54 static void event_signal_stack_down(void *context);
56 // Unvetted includes/imports, etc which should be removed or vetted in the future
57 static future_t *hack_future;
58 void bte_main_enable();
59 void btif_thread_post(thread_fn func, void *context);
60 // End unvetted section
62 // Interface functions
64 static void init_stack(void) {
65 // This is a synchronous process. Post it to the thread though, so
66 // state modification only happens there. Using the thread to perform
67 // all stack operations ensures that the operations are done serially
68 // and do not overlap.
69 semaphore_t *semaphore = semaphore_new(0);
70 thread_post(management_thread, event_init_stack, semaphore);
71 semaphore_wait(semaphore);
72 semaphore_free(semaphore);
75 static void start_up_stack_async(void) {
76 thread_post(management_thread, event_start_up_stack, NULL);
79 static void shut_down_stack_async(void) {
80 thread_post(management_thread, event_shut_down_stack, NULL);
83 static void clean_up_stack(void) {
84 // This is a synchronous process. Post it to the thread though, so
85 // state modification only happens there.
86 semaphore_t *semaphore = semaphore_new(0);
87 thread_post(management_thread, event_clean_up_stack, semaphore);
88 semaphore_wait(semaphore);
89 semaphore_free(semaphore);
92 static bool get_stack_is_running(void) {
93 return stack_is_running;
98 // Synchronous function to initialize the stack
99 static void event_init_stack(void *context) {
100 semaphore_t *semaphore = (semaphore_t *)context;
102 LOG_INFO(LOG_TAG, "%s is initializing the stack", __func__);
104 if (stack_is_initialized) {
105 LOG_INFO(LOG_TAG, "%s found the stack already in initialized state",
108 module_management_start();
110 module_init(get_module(OSI_MODULE));
111 module_init(get_module(BT_UTILS_MODULE));
112 module_init(get_module(BTIF_CONFIG_MODULE));
113 btif_init_bluetooth();
115 // stack init is synchronous, so no waiting necessary here
116 stack_is_initialized = true;
119 LOG_INFO(LOG_TAG, "%s finished", __func__);
122 semaphore_post(semaphore);
125 static void ensure_stack_is_initialized(void) {
126 if (!stack_is_initialized) {
127 LOG_WARN(LOG_TAG, "%s found the stack was uninitialized. Initializing now.", __func__);
128 // No semaphore needed since we are calling it directly
129 event_init_stack(NULL);
133 // Synchronous function to start up the stack
134 static void event_start_up_stack(UNUSED_ATTR void *context) {
135 if (stack_is_running) {
136 LOG_INFO(LOG_TAG, "%s stack already brought up", __func__);
140 ensure_stack_is_initialized();
142 LOG_INFO(LOG_TAG, "%s is bringing up the stack", __func__);
143 future_t *local_hack_future = future_new();
144 hack_future = local_hack_future;
146 // Include this for now to put btif config into a shutdown-able state
147 module_start_up(get_module(BTIF_CONFIG_MODULE));
150 if (future_await(local_hack_future) != FUTURE_SUCCESS) {
151 LOG_ERROR(LOG_TAG, "%s failed to start up the stack", __func__);
152 stack_is_running = true; // So stack shutdown actually happens
153 event_shut_down_stack(NULL);
157 stack_is_running = true;
158 LOG_INFO(LOG_TAG, "%s finished", __func__);
159 btif_thread_post(event_signal_stack_up, NULL);
162 // Synchronous function to shut down the stack
163 static void event_shut_down_stack(UNUSED_ATTR void *context) {
164 if (!stack_is_running) {
165 LOG_INFO(LOG_TAG, "%s stack is already brought down", __func__);
169 LOG_INFO(LOG_TAG, "%s is bringing down the stack", __func__);
170 future_t *local_hack_future = future_new();
171 hack_future = local_hack_future;
172 stack_is_running = false;
174 btif_disable_bluetooth();
175 module_shut_down(get_module(BTIF_CONFIG_MODULE));
177 future_await(local_hack_future);
178 module_shut_down(get_module(CONTROLLER_MODULE)); // Doesn't do any work, just puts it in a restartable state
180 LOG_INFO(LOG_TAG, "%s finished", __func__);
181 hack_future = future_new();
182 btif_thread_post(event_signal_stack_down, NULL);
183 future_await(hack_future);
186 static void ensure_stack_is_not_running(void) {
187 if (stack_is_running) {
188 LOG_WARN(LOG_TAG, "%s found the stack was still running. Bringing it down now.", __func__);
189 event_shut_down_stack(NULL);
193 // Synchronous function to clean up the stack
194 static void event_clean_up_stack(void *context) {
195 if (!stack_is_initialized) {
196 LOG_INFO(LOG_TAG, "%s found the stack already in a clean state", __func__);
200 ensure_stack_is_not_running();
202 LOG_INFO(LOG_TAG, "%s is cleaning up the stack", __func__);
203 stack_is_initialized = false;
205 btif_cleanup_bluetooth();
206 module_clean_up(get_module(BTIF_CONFIG_MODULE));
207 module_clean_up(get_module(BT_UTILS_MODULE));
208 module_clean_up(get_module(OSI_MODULE));
209 module_management_stop();
210 LOG_INFO(LOG_TAG, "%s finished", __func__);
213 semaphore_t *semaphore = (semaphore_t *)context;
215 semaphore_post(semaphore);
218 static void event_signal_stack_up(UNUSED_ATTR void *context) {
219 // Notify BTIF connect queue that we've brought up the stack. It's
220 // now time to dispatch all the pending profile connect requests.
221 btif_queue_connect_next();
222 HAL_CBACK(bt_hal_cbacks, adapter_state_changed_cb, BT_STATE_ON);
225 static void event_signal_stack_down(UNUSED_ATTR void *context) {
226 HAL_CBACK(bt_hal_cbacks, adapter_state_changed_cb, BT_STATE_OFF);
227 future_ready(stack_manager_get_hack_future(), FUTURE_SUCCESS);
230 static void ensure_manager_initialized(void) {
231 if (management_thread)
234 management_thread = thread_new("stack_manager");
235 if (!management_thread) {
236 LOG_ERROR(LOG_TAG, "%s unable to create stack management thread", __func__);
241 static const stack_manager_t interface = {
243 start_up_stack_async,
244 shut_down_stack_async,
250 const stack_manager_t *stack_manager_get_interface() {
251 ensure_manager_initialized();
255 future_t *stack_manager_get_hack_future() {