firmware/ata_idle_notify.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 Jonathan Gordon
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdbool.h>
  22 #include "system.h"
  23 #include "ata.h"
  24 #include "ata_idle_notify.h"
  25 #include "kernel.h"
  26 #include "string.h"
  27
  28 void register_ata_idle_func(ata_idle_notify function)
  29 {
  30 #if USING_ATA_CALLBACK
  31     add_event(DISK_EVENT_SPINUP, true, function);
  32 #else
  33     function(); /* just call the function now */
  34 /* this _may_ cause problems later if the calling function
  35    sets a variable expecting the callback to unset it, because
  36    the callback will be run before this function exits, so before the var is set */
  37 #endif
  38 }
  39
  40 #if USING_ATA_CALLBACK
  41 void unregister_ata_idle_func(ata_idle_notify func, bool run)
  42 {
  43     remove_event(DISK_EVENT_SPINUP, func);
  44
  45     if (run)
  46         func();
  47 }
  48
  49 bool call_ata_idle_notifys(bool force)
  50 {
  51     static int lock_until = 0;
  52
  53     if (!force)
  54     {
  55         if (TIME_BEFORE(current_tick,lock_until) )
  56             return false;
  57     }
  58     lock_until = current_tick + 30*HZ;
  59
  60     send_event(DISK_EVENT_SPINUP, NULL);
  61
  62     return true;
  63 }
  64 #endif