iokit/Kernel/IOPMPowerStateQueue.h

   1 /*
   2  * Copyright (c) 2001-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 #ifndef _IOPMPOWERSTATEQUEUE_H_
  24 #define _IOPMPOWERSTATEQUEUE_H_
  25
  26 #include <IOKit/IOWorkLoop.h>
  27 #include <IOKit/IOEventSource.h>
  28 #include <IOKit/IOService.h>
  29 extern "C" {
  30     #include <kern/queue.h>
  31 }
  32
  33 class IOPMPowerStateQueue : public IOEventSource
  34  {
  35     OSDeclareDefaultStructors(IOPMPowerStateQueue);
  36
  37 private:
  38     enum {
  39         kUnIdle = 0
  40     };
  41
  42     // Queue of requested states
  43     struct PowerChangeEntry
  44     {
  45         void                    *next;
  46         UInt16                  actionType;
  47         UInt16                  state;
  48         IOService               *target;
  49     };
  50
  51     void                        *changes;
  52
  53 protected:
  54     virtual bool checkForWork(void);
  55
  56 public:
  57     //typedef void (*Action)(IOService *target, unsigned long state);
  58
  59     virtual bool init(OSObject *owner, Action action = 0);
  60
  61     // static initialiser
  62     static IOPMPowerStateQueue *PMPowerStateQueue(OSObject *owner);
  63
  64     // Enqueues an activityTickle request to be executed on the workloop
  65     virtual bool unIdleOccurred(IOService *, unsigned long);
  66  };
  67
  68  #endif /* _IOPMPOWERSTATEQUEUE_H_ */
  69