iokit/Kernel/IOPMPowerStateQueue.h

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