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1 /* Copyright 2015 The Chromium OS Authors. All rights reserved.
2  * Use of this source code is governed by a BSD-style license that can be
3  * found in the LICENSE file.
4  */
5 
6 #ifndef CRAS_MAIN_MESSAGE_H_
7 #define CRAS_MAIN_MESSAGE_H_
8 
9 #include <stdio.h>
10 
11 #include "utlist.h"
12 
13 /* The types of message main thread can handle. */
14 enum CRAS_MAIN_MESSAGE_TYPE {
15 	/* Audio thread -> main thread */
16 	CRAS_MAIN_A2DP,
17 	CRAS_MAIN_AUDIO_THREAD_EVENT,
18 	CRAS_MAIN_BT,
19 	CRAS_MAIN_METRICS,
20 	CRAS_MAIN_MONITOR_DEVICE,
21 	CRAS_MAIN_HOTWORD_TRIGGERED,
22 	CRAS_MAIN_NON_EMPTY_AUDIO_STATE,
23 };
24 
25 /* Structure of the header of the message handled by main thread.
26  * Args:
27  *    length - Size of the whole message.
28  *    type - Type of the message.
29  */
30 struct cras_main_message {
31 	size_t length;
32 	enum CRAS_MAIN_MESSAGE_TYPE type;
33 };
34 
35 /* Callback function to handle main thread message. */
36 typedef void (*cras_message_callback)(struct cras_main_message *msg,
37 				      void *arg);
38 
39 /* Sends a message to main thread. */
40 int cras_main_message_send(struct cras_main_message *msg);
41 
42 /* Registers the handler function for specific type of message. */
43 int cras_main_message_add_handler(enum CRAS_MAIN_MESSAGE_TYPE type,
44 				  cras_message_callback callback,
45 				  void *callback_data);
46 
47 /* Initialize the message handling mechanism in main thread. */
48 void cras_main_message_init();
49 
50 #endif /* CRAS_MAIN_MESSAGE_H_ */
51