FreeBSD/Linux Kernel Cross Reference
sys/contrib/vchiq/interface/vchiq_arm/vchiq_connected.c

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

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