| popcornmix | 71bad7f | 2013-07-02 23:42:01 +0100 | [diff] [blame] | 1 | /** |
| 2 | * Copyright (c) 2010-2012 Broadcom. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions, and the following disclaimer, |
| 9 | * without modification. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. The names of the above-listed copyright holders may not be used |
| 14 | * to endorse or promote products derived from this software without |
| 15 | * specific prior written permission. |
| 16 | * |
| 17 | * ALTERNATIVELY, this software may be distributed under the terms of the |
| 18 | * GNU General Public License ("GPL") version 2, as published by the Free |
| 19 | * Software Foundation. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| 22 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 23 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 24 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| 25 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 27 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 28 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #include "vchiq_connected.h" |
| 35 | #include "vchiq_core.h" |
| 36 | #include "vchiq_killable.h" |
| 37 | #include <linux/module.h> |
| 38 | #include <linux/mutex.h> |
| 39 | |
| 40 | #define MAX_CALLBACKS 10 |
| 41 | |
| 42 | static int g_connected; |
| 43 | static int g_num_deferred_callbacks; |
| 44 | static VCHIQ_CONNECTED_CALLBACK_T g_deferred_callback[MAX_CALLBACKS]; |
| 45 | static int g_once_init; |
| 46 | static struct mutex g_connected_mutex; |
| 47 | |
| 48 | /**************************************************************************** |
| 49 | * |
| 50 | * Function to initialize our lock. |
| 51 | * |
| 52 | ***************************************************************************/ |
| 53 | |
| 54 | static void connected_init(void) |
| 55 | { |
| 56 | if (!g_once_init) { |
| 57 | mutex_init(&g_connected_mutex); |
| 58 | g_once_init = 1; |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | /**************************************************************************** |
| 63 | * |
| 64 | * This function is used to defer initialization until the vchiq stack is |
| 65 | * initialized. If the stack is already initialized, then the callback will |
| 66 | * be made immediately, otherwise it will be deferred until |
| 67 | * vchiq_call_connected_callbacks is called. |
| 68 | * |
| 69 | ***************************************************************************/ |
| 70 | |
| 71 | void vchiq_add_connected_callback(VCHIQ_CONNECTED_CALLBACK_T callback) |
| 72 | { |
| 73 | connected_init(); |
| 74 | |
| 75 | if (mutex_lock_interruptible(&g_connected_mutex) != 0) |
| 76 | return; |
| 77 | |
| 78 | if (g_connected) |
| 79 | /* We're already connected. Call the callback immediately. */ |
| 80 | |
| 81 | callback(); |
| 82 | else { |
| 83 | if (g_num_deferred_callbacks >= MAX_CALLBACKS) |
| 84 | vchiq_log_error(vchiq_core_log_level, |
| 85 | "There already %d callback registered - " |
| 86 | "please increase MAX_CALLBACKS", |
| 87 | g_num_deferred_callbacks); |
| 88 | else { |
| 89 | g_deferred_callback[g_num_deferred_callbacks] = |
| 90 | callback; |
| 91 | g_num_deferred_callbacks++; |
| 92 | } |
| 93 | } |
| 94 | mutex_unlock(&g_connected_mutex); |
| 95 | } |
| 96 | |
| 97 | /**************************************************************************** |
| 98 | * |
| 99 | * This function is called by the vchiq stack once it has been connected to |
| 100 | * the videocore and clients can start to use the stack. |
| 101 | * |
| 102 | ***************************************************************************/ |
| 103 | |
| 104 | void vchiq_call_connected_callbacks(void) |
| 105 | { |
| 106 | int i; |
| 107 | |
| 108 | connected_init(); |
| 109 | |
| 110 | if (mutex_lock_interruptible(&g_connected_mutex) != 0) |
| 111 | return; |
| 112 | |
| 113 | for (i = 0; i < g_num_deferred_callbacks; i++) |
| 114 | g_deferred_callback[i](); |
| 115 | |
| 116 | g_num_deferred_callbacks = 0; |
| 117 | g_connected = 1; |
| 118 | mutex_unlock(&g_connected_mutex); |
| 119 | } |
| 120 | EXPORT_SYMBOL(vchiq_add_connected_callback); |