iokit/Kernel/IOPMPowerStateQueue.h

   1 /*
   2  * Copyright (c) 2001-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30
  31 #ifndef _IOPMPOWERSTATEQUEUE_H_
  32 #define _IOPMPOWERSTATEQUEUE_H_
  33
  34 #include <IOKit/IOWorkLoop.h>
  35 #include <IOKit/IOEventSource.h>
  36 #include <IOKit/IOService.h>
  37 extern "C" {
  38     #include <kern/queue.h>
  39 }
  40
  41 class IOPMPowerStateQueue : public IOEventSource
  42  {
  43     OSDeclareDefaultStructors(IOPMPowerStateQueue);
  44
  45 private:
  46     enum {
  47         kUnIdle = 0
  48     };
  49
  50     // Queue of requested states
  51     struct PowerChangeEntry
  52     {
  53         void                    *next;
  54         UInt16                  actionType;
  55         UInt16                  state;
  56         IOService               *target;
  57     };
  58
  59     void                        *changes;
  60
  61 protected:
  62     virtual bool checkForWork(void);
  63
  64 public:
  65     //typedef void (*Action)(IOService *target, unsigned long state);
  66
  67     virtual bool init(OSObject *owner, Action action = 0);
  68
  69     // static initialiser
  70     static IOPMPowerStateQueue *PMPowerStateQueue(OSObject *owner);
  71
  72     // Enqueues an activityTickle request to be executed on the workloop
  73     virtual bool unIdleOccurred(IOService *, unsigned long);
  74  };
  75
  76  #endif /* _IOPMPOWERSTATEQUEUE_H_ */
  77