diff options
Diffstat (limited to 'drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c')
-rw-r--r-- | drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c new file mode 100644 index 0000000..5efc62f --- /dev/null +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c @@ -0,0 +1,120 @@ +/** + * 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" +#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_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 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_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; + mutex_unlock(&g_connected_mutex); +} +EXPORT_SYMBOL(vchiq_add_connected_callback); |