rom/filesys/fat/timer.c

   1 /*
   2  * fat-handler - FAT12/16/32 filesystem handler
   3  *
   4  * Copyright © 2008-2015 The AROS Development Team
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the same terms as AROS itself.
   8  *
   9  * $Id$
  10  */
  11
  12 #define DEBUG 0
  13
  14 #include <devices/timer.h>
  15 #include <dos/dos.h>
  16 #include <proto/exec.h>
  17
  18 #include "debug.h"
  19 #include "fat_fs.h"
  20 #include "fat_protos.h"
  21
  22 LONG InitTimer(struct Globals *glob)
  23 {
  24     LONG err = ERROR_NO_FREE_STORE;
  25
  26     glob->timerport = CreateMsgPort();
  27     if (glob->timerport)
  28     {
  29         glob->timereq =
  30             (struct timerequest *)CreateIORequest(glob->timerport,
  31             sizeof(struct timerequest));
  32         if (glob->timereq)
  33         {
  34             if (OpenDevice("timer.device", UNIT_VBLANK,
  35                 (struct IORequest *)glob->timereq, 0))
  36                 err = ERROR_DEVICE_NOT_MOUNTED;
  37             else
  38             {
  39                 glob->timer_active = 0;
  40                 glob->restart_timer = 1;
  41                 glob->gl_TimerBase = glob->timereq->tr_node.io_Device;
  42                 D(bug("[fat] Timer ready\n"));
  43                 return 0;
  44             }
  45             DeleteIORequest((struct IORequest *)glob->timereq);
  46         }
  47         DeleteMsgPort(glob->timerport);
  48     }
  49     return err;
  50 }
  51
  52 void CleanupTimer(struct Globals *glob)
  53 {
  54     D(bug("[fat] Cleaning up timer\n"));
  55     if (glob->timer_active)
  56     {
  57         D(bug("[fat] Terminating active request\n"));
  58         AbortIO((struct IORequest *)glob->timereq);
  59         WaitIO((struct IORequest *)glob->timereq);
  60     }
  61     CloseDevice((struct IORequest *)glob->timereq);
  62     DeleteIORequest((struct IORequest *)glob->timereq);
  63     DeleteMsgPort(glob->timerport);
  64 }
  65
  66 void RestartTimer(struct Globals *glob)
  67 {
  68     if (glob->timer_active)
  69     {
  70         D(bug("Queuing timer restart\n"));
  71         glob->restart_timer = 1;
  72     }
  73     else
  74     {
  75         D(bug("Immediate timer restart\n"));
  76         glob->timereq->tr_node.io_Command = TR_ADDREQUEST;
  77         glob->timereq->tr_time.tv_secs = 1;
  78         glob->timereq->tr_time.tv_micro = 0;
  79         SendIO((struct IORequest *)glob->timereq);
  80         glob->timer_active = 1;
  81     }
  82 }
  83
  84 void HandleTimer(struct Globals *glob)
  85 {
  86     WaitIO((struct IORequest *)glob->timereq);
  87     glob->timer_active = 0;
  88     if (glob->restart_timer)
  89     {
  90         D(bug("Timer restart queued\n"));
  91         glob->restart_timer = 0;
  92         RestartTimer(glob);
  93     }
  94     else
  95     {
  96         D(bug("Updating disk\n"));
  97         UpdateDisk(glob);
  98     }
  99 }