iokit/Kernel/IOPMPowerStateQueue.h

   1 /*
   2  * Copyright (c) 2001-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 #ifndef _IOPMPOWERSTATEQUEUE_H_
  27 #define _IOPMPOWERSTATEQUEUE_H_
  28
  29 #include <IOKit/IOWorkLoop.h>
  30 #include <IOKit/IOEventSource.h>
  31 #include <IOKit/IOService.h>
  32 extern "C" {
  33     #include <kern/queue.h>
  34 }
  35
  36 class IOPMPowerStateQueue : public IOEventSource
  37  {
  38     OSDeclareDefaultStructors(IOPMPowerStateQueue);
  39
  40 private:
  41     enum {
  42         kUnIdle = 0
  43     };
  44
  45     // Queue of requested states
  46     struct PowerChangeEntry
  47     {
  48         void                    *next;
  49         UInt16                  actionType;
  50         UInt16                  state;
  51         IOService               *target;
  52     };
  53
  54     void                        *changes;
  55
  56 protected:
  57     virtual bool checkForWork(void);
  58
  59 public:
  60     //typedef void (*Action)(IOService *target, unsigned long state);
  61
  62     virtual bool init(OSObject *owner, Action action = 0);
  63
  64     // static initialiser
  65     static IOPMPowerStateQueue *PMPowerStateQueue(OSObject *owner);
  66
  67     // Enqueues an activityTickle request to be executed on the workloop
  68     virtual bool unIdleOccurred(IOService *, unsigned long);
  69  };
  70
  71  #endif /* _IOPMPOWERSTATEQUEUE_H_ */