// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/* Copyright (c) 2010-2012 Broadcom. All rights reserved. */
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#include "vchiq_connected.h"
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#include "vchiq_core.h"
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#include <linux/module.h>
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#include <linux/mutex.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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/* Function to initialize our lock */
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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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mutex_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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* 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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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 (mutex_lock_killable(&g_connected_mutex))
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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 already %d callback 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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mutex_unlock(&g_connected_mutex);
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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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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 (mutex_lock_killable(&g_connected_mutex))
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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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mutex_unlock(&g_connected_mutex);
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}
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EXPORT_SYMBOL(vchiq_add_connected_callback);
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