xnu-517.tar.gz

[apple/xnu.git] / iokit / Kernel / IOPMPowerStateQueue.h

diff --git a/iokit/Kernel/IOPMPowerStateQueue.h b/iokit/Kernel/IOPMPowerStateQueue.h
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+/*
+ * Copyright (c) 2001-2002 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+ 
+#ifndef _IOPMPOWERSTATEQUEUE_H_
+#define _IOPMPOWERSTATEQUEUE_H_
+ 
+#include <IOKit/IOWorkLoop.h>
+#include <IOKit/IOEventSource.h>
+#include <IOKit/IOService.h>
+extern "C" {
+    #include <kern/queue.h>
+}
+
+class IOPMPowerStateQueue : public IOEventSource
+ {
+    OSDeclareDefaultStructors(IOPMPowerStateQueue);
+
+private:
+    enum {
+        kUnIdle = 0
+    };
+
+    // Queue of requested states
+    struct PowerChangeEntry 
+    {
+        void                    *next;
+        UInt16                  actionType;
+        UInt16                  state;
+        IOService               *target;
+    };
+
+    void                        *changes;
+
+protected:
+    virtual bool checkForWork(void);
+
+public:
+    //typedef void (*Action)(IOService *target, unsigned long state);
+
+    virtual bool init(OSObject *owner, Action action = 0);
+
+    // static initialiser
+    static IOPMPowerStateQueue *PMPowerStateQueue(OSObject *owner);
+         
+    // Enqueues an activityTickle request to be executed on the workloop
+    virtual bool unIdleOccurred(IOService *, unsigned long);
+ };
+ 
+ #endif /* _IOPMPOWERSTATEQUEUE_H_ */