1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/******************************************************************************
*
* Copyright (C) 2009-2012 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/*****************************************************************************
*
* Filename: btif_sm.c
*
* Description: Generic BTIF state machine API
*
*****************************************************************************/
#include <hardware/bluetooth.h>
#define LOG_TAG "BTIF_SM"
#include "btif_common.h"
#include "btif_sm.h"
#include "gki.h"
/*****************************************************************************
** Constants & Macros
******************************************************************************/
/*****************************************************************************
** Local type definitions
******************************************************************************/
typedef struct {
btif_sm_state_t state;
btif_sm_handler_t *p_handlers;
} btif_sm_cb_t;
/*****************************************************************************
** Static variables
******************************************************************************/
/*****************************************************************************
** Static functions
******************************************************************************/
/*****************************************************************************
** Externs
******************************************************************************/
/*****************************************************************************
** Functions
******************************************************************************/
/*****************************************************************************
**
** Function btif_sm_init
**
** Description Initializes the state machine with the state handlers
** The caller should ensure that the table and the corresponding
** states match. The location that 'p_handlers' points to shall
** be available until the btif_sm_shutdown API is invoked.
**
** Returns Returns a pointer to the initialized state machine handle.
**
******************************************************************************/
btif_sm_handle_t btif_sm_init(const btif_sm_handler_t *p_handlers, btif_sm_state_t initial_state)
{
btif_sm_cb_t *p_cb;
if (p_handlers == NULL)
{
BTIF_TRACE_ERROR1("%s : p_handlers is NULL", __FUNCTION__);
return NULL;
}
p_cb = (btif_sm_cb_t*) GKI_os_malloc(sizeof(btif_sm_cb_t));
p_cb->state = initial_state;
p_cb->p_handlers = (btif_sm_handler_t*)p_handlers;
/* Send BTIF_SM_ENTER_EVT to the initial state */
p_cb->p_handlers[initial_state](BTIF_SM_ENTER_EVT, NULL);
return (btif_sm_handle_t)p_cb;
}
/*****************************************************************************
**
** Function btif_sm_shutdown
**
** Description Tears down the state machine
**
** Returns None
**
******************************************************************************/
void btif_sm_shutdown(btif_sm_handle_t handle)
{
btif_sm_cb_t *p_cb = (btif_sm_cb_t*)handle;
if (p_cb == NULL)
{
BTIF_TRACE_ERROR1("%s : Invalid handle", __FUNCTION__);
return;
}
GKI_os_free((void*)p_cb);
}
/*****************************************************************************
**
** Function btif_sm_get_state
**
** Description Fetches the current state of the state machine
**
** Returns Current state
**
******************************************************************************/
btif_sm_state_t btif_sm_get_state(btif_sm_handle_t handle)
{
btif_sm_cb_t *p_cb = (btif_sm_cb_t*)handle;
if (p_cb == NULL)
{
BTIF_TRACE_ERROR1("%s : Invalid handle", __FUNCTION__);
return 0;
}
return p_cb->state;
}
/*****************************************************************************
**
** Function btif_sm_dispatch
**
** Description Dispatches the 'event' along with 'data' to the current state handler
**
** Returns BT_STATUS_SUCCESS on success
** BT_STATUS_UNHANDLED if event was not processed
** BT_STATUS_FAIL otherwise
**
******************************************************************************/
bt_status_t btif_sm_dispatch(btif_sm_handle_t handle, btif_sm_event_t event,
void *data)
{
bt_status_t status = BT_STATUS_SUCCESS;
btif_sm_cb_t *p_cb = (btif_sm_cb_t*)handle;
if (p_cb == NULL)
{
BTIF_TRACE_ERROR1("%s : Invalid handle", __FUNCTION__);
return BT_STATUS_FAIL;
}
if (p_cb->p_handlers[p_cb->state](event, data) == FALSE)
return BT_STATUS_UNHANDLED;
return status;
}
/*****************************************************************************
**
** Function btif_sm_change_state
**
** Description Make a transition to the new 'state'. The 'BTIF_SM_EXIT_EVT'
** shall be invoked before exiting the current state. The
** 'BTIF_SM_ENTER_EVT' shall be invoked before entering the new state
**
** Returns BT_STATUS_SUCCESS on success
** BT_STATUS_UNHANDLED if event was not processed
** BT_STATUS_FAIL otherwise
**
******************************************************************************/
bt_status_t btif_sm_change_state(btif_sm_handle_t handle, btif_sm_state_t state)
{
bt_status_t status = BT_STATUS_SUCCESS;
btif_sm_cb_t *p_cb = (btif_sm_cb_t*)handle;
if (p_cb == NULL)
{
BTIF_TRACE_ERROR1("%s : Invalid handle", __FUNCTION__);
return BT_STATUS_FAIL;
}
/* Send exit event to the current state */
if (p_cb->p_handlers[p_cb->state](BTIF_SM_EXIT_EVT, NULL) == FALSE)
status = BT_STATUS_UNHANDLED;
/* Change to the new state */
p_cb->state = state;
/* Send enter event to the new state */
if (p_cb->p_handlers[p_cb->state](BTIF_SM_ENTER_EVT, NULL) == FALSE)
status = BT_STATUS_UNHANDLED;
return status;
}
|
