1/**
2 * Copyright (c) 2010-2012 Broadcom. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions, and the following disclaimer,
9 * without modification.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The names of the above-listed copyright holders may not be used
14 * to endorse or promote products derived from this software without
15 * specific prior written permission.
16 *
17 * ALTERNATIVELY, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2, as published by the Free
19 * Software Foundation.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include "vchiq_connected.h"
35#include "vchiq_core.h"
| 1/**
2 * Copyright (c) 2010-2012 Broadcom. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions, and the following disclaimer,
9 * without modification.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The names of the above-listed copyright holders may not be used
14 * to endorse or promote products derived from this software without
15 * specific prior written permission.
16 *
17 * ALTERNATIVELY, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2, as published by the Free
19 * Software Foundation.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include "vchiq_connected.h"
35#include "vchiq_core.h"
|
36
37#define MAX_CALLBACKS 10
38
39static int g_connected;
40static int g_num_deferred_callbacks;
41static VCHIQ_CONNECTED_CALLBACK_T g_deferred_callback[MAX_CALLBACKS];
42static int g_once_init;
43static struct mutex g_connected_mutex;
44
45/****************************************************************************
46*
47* Function to initialize our lock.
48*
49***************************************************************************/
50
51static void connected_init(void)
52{
53 if (!g_once_init) {
54 lmutex_init(&g_connected_mutex);
55 g_once_init = 1;
56 }
57}
58
59/****************************************************************************
60*
61* This function is used to defer initialization until the vchiq stack is
62* initialized. If the stack is already initialized, then the callback will
63* be made immediately, otherwise it will be deferred until
64* vchiq_call_connected_callbacks is called.
65*
66***************************************************************************/
67
68void vchiq_add_connected_callback(VCHIQ_CONNECTED_CALLBACK_T callback)
69{
70 connected_init();
71
72 if (lmutex_lock_interruptible(&g_connected_mutex) != 0)
73 return;
74
75 if (g_connected)
76 /* We're already connected. Call the callback immediately. */
77
78 callback();
79 else {
80 if (g_num_deferred_callbacks >= MAX_CALLBACKS)
81 vchiq_log_error(vchiq_core_log_level,
82 "There are already %d callbacks registered - "
83 "please increase MAX_CALLBACKS",
84 g_num_deferred_callbacks);
85 else {
86 g_deferred_callback[g_num_deferred_callbacks] =
87 callback;
88 g_num_deferred_callbacks++;
89 }
90 }
91 lmutex_unlock(&g_connected_mutex);
92}
93
94/****************************************************************************
95*
96* This function is called by the vchiq stack once it has been connected to
97* the videocore and clients can start to use the stack.
98*
99***************************************************************************/
100
101void vchiq_call_connected_callbacks(void)
102{
103 int i;
104
105 connected_init();
106
107 if (lmutex_lock_interruptible(&g_connected_mutex) != 0)
108 return;
109
110 for (i = 0; i < g_num_deferred_callbacks; i++)
111 g_deferred_callback[i]();
112
113 g_num_deferred_callbacks = 0;
114 g_connected = 1;
115 lmutex_unlock(&g_connected_mutex);
116}
117EXPORT_SYMBOL(vchiq_add_connected_callback);
| 37
38#define MAX_CALLBACKS 10
39
40static int g_connected;
41static int g_num_deferred_callbacks;
42static VCHIQ_CONNECTED_CALLBACK_T g_deferred_callback[MAX_CALLBACKS];
43static int g_once_init;
44static struct mutex g_connected_mutex;
45
46/****************************************************************************
47*
48* Function to initialize our lock.
49*
50***************************************************************************/
51
52static void connected_init(void)
53{
54 if (!g_once_init) {
55 lmutex_init(&g_connected_mutex);
56 g_once_init = 1;
57 }
58}
59
60/****************************************************************************
61*
62* This function is used to defer initialization until the vchiq stack is
63* initialized. If the stack is already initialized, then the callback will
64* be made immediately, otherwise it will be deferred until
65* vchiq_call_connected_callbacks is called.
66*
67***************************************************************************/
68
69void vchiq_add_connected_callback(VCHIQ_CONNECTED_CALLBACK_T callback)
70{
71 connected_init();
72
73 if (lmutex_lock_interruptible(&g_connected_mutex) != 0)
74 return;
75
76 if (g_connected)
77 /* We're already connected. Call the callback immediately. */
78
79 callback();
80 else {
81 if (g_num_deferred_callbacks >= MAX_CALLBACKS)
82 vchiq_log_error(vchiq_core_log_level,
83 "There are already %d callbacks registered - "
84 "please increase MAX_CALLBACKS",
85 g_num_deferred_callbacks);
86 else {
87 g_deferred_callback[g_num_deferred_callbacks] =
88 callback;
89 g_num_deferred_callbacks++;
90 }
91 }
92 lmutex_unlock(&g_connected_mutex);
93}
94
95/****************************************************************************
96*
97* This function is called by the vchiq stack once it has been connected to
98* the videocore and clients can start to use the stack.
99*
100***************************************************************************/
101
102void vchiq_call_connected_callbacks(void)
103{
104 int i;
105
106 connected_init();
107
108 if (lmutex_lock_interruptible(&g_connected_mutex) != 0)
109 return;
110
111 for (i = 0; i < g_num_deferred_callbacks; i++)
112 g_deferred_callback[i]();
113
114 g_num_deferred_callbacks = 0;
115 g_connected = 1;
116 lmutex_unlock(&g_connected_mutex);
117}
118EXPORT_SYMBOL(vchiq_add_connected_callback);
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