mirror of https://github.com/F-Stack/f-stack.git
119 lines
4.0 KiB
C
119 lines
4.0 KiB
C
/**
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* Copyright (c) 2010-2012 Broadcom. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the above-listed copyright holders may not be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* ALTERNATIVELY, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2, as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "vchiq_connected.h"
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#include "vchiq_core.h"
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#include "vchiq_killable.h"
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#define MAX_CALLBACKS 10
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static int g_connected;
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static int g_num_deferred_callbacks;
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static VCHIQ_CONNECTED_CALLBACK_T g_deferred_callback[MAX_CALLBACKS];
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static int g_once_init;
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static struct mutex g_connected_mutex;
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/****************************************************************************
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*
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* Function to initialize our lock.
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*
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***************************************************************************/
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static void connected_init(void)
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{
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if (!g_once_init) {
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lmutex_init(&g_connected_mutex);
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g_once_init = 1;
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}
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}
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/****************************************************************************
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*
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* This function is used to defer initialization until the vchiq stack is
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* initialized. If the stack is already initialized, then the callback will
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* be made immediately, otherwise it will be deferred until
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* vchiq_call_connected_callbacks is called.
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*
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***************************************************************************/
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void vchiq_add_connected_callback(VCHIQ_CONNECTED_CALLBACK_T callback)
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{
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connected_init();
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if (lmutex_lock_interruptible(&g_connected_mutex) != 0)
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return;
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if (g_connected)
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/* We're already connected. Call the callback immediately. */
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callback();
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else {
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if (g_num_deferred_callbacks >= MAX_CALLBACKS)
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vchiq_log_error(vchiq_core_log_level,
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"There are already %d callbacks registered - "
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"please increase MAX_CALLBACKS",
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g_num_deferred_callbacks);
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else {
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g_deferred_callback[g_num_deferred_callbacks] =
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callback;
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g_num_deferred_callbacks++;
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}
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}
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lmutex_unlock(&g_connected_mutex);
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}
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/****************************************************************************
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*
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* This function is called by the vchiq stack once it has been connected to
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* the videocore and clients can start to use the stack.
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*
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***************************************************************************/
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void vchiq_call_connected_callbacks(void)
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{
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int i;
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connected_init();
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if (lmutex_lock_interruptible(&g_connected_mutex) != 0)
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return;
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for (i = 0; i < g_num_deferred_callbacks; i++)
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g_deferred_callback[i]();
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g_num_deferred_callbacks = 0;
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g_connected = 1;
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lmutex_unlock(&g_connected_mutex);
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}
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EXPORT_SYMBOL(vchiq_add_connected_callback);
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