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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/* Copyright (c) 2010-2012 Broadcom. All rights reserved. */
#include "vchiq_connected.h"
#include "vchiq_core.h"
#include <linux/module.h>
#include <linux/mutex.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) {
mutex_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 (mutex_lock_killable(&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 already %d callback registered - "
"please increase MAX_CALLBACKS",
g_num_deferred_callbacks);
else {
g_deferred_callback[g_num_deferred_callbacks] =
callback;
g_num_deferred_callbacks++;
}
}
mutex_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 (mutex_lock_killable(&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;
mutex_unlock(&g_connected_mutex);
}
EXPORT_SYMBOL(vchiq_add_connected_callback);
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