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+<HTML
+><HEAD
+><TITLE
+>Attached and Detached Controllers</TITLE
+><meta name="MSSmartTagsPreventParsing" content="TRUE">
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+NAME="GENERATOR"
+CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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+TITLE="eCos Reference Manual"
+HREF="ecos-ref.html"><LINK
+REL="UP"
+TITLE="eCos Power Management Support"
+HREF="services-power.html"><LINK
+REL="PREVIOUS"
+TITLE="Support for Policy Modules"
+HREF="power-policy.html"><LINK
+REL="NEXT"
+TITLE="Implementing a Power Controller"
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+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><H1
+><A
+NAME="POWER-ATTACHED">Attached and Detached Controllers</H1
+><DIV
+CLASS="REFNAMEDIV"
+><A
+NAME="AEN15902"
+></A
+><H2
+>Name</H2
+>Attached and Detached Controllers -- control which power controllers are affected by global changes</DIV
+><DIV
+CLASS="REFSYNOPSISDIV"
+><A
+NAME="AEN15905"><H2
+>Synopsis</H2
+><DIV
+CLASS="FUNCSYNOPSIS"
+><A
+NAME="AEN15906"><P
+></P
+><TABLE
+BORDER="5"
+BGCOLOR="#E0E0F0"
+WIDTH="70%"
+><TR
+><TD
+><PRE
+CLASS="FUNCSYNOPSISINFO"
+>#include <cyg/power/power.h></PRE
+></TD
+></TR
+></TABLE
+><P
+><CODE
+><CODE
+CLASS="FUNCDEF"
+> cyg_bool power_get_controller_attached
+ </CODE
+>( PowerController* controller
+ );</CODE
+></P
+><P
+><CODE
+><CODE
+CLASS="FUNCDEF"
+> void power_set_controller_attached
+ </CODE
+>( PowerController* controller
+ , cyg_bool new_state
+ );</CODE
+></P
+><P
+></P
+></DIV
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN15920"
+></A
+><H2
+>Detaching Power Controllers</H2
+><P
+>By default the global operation <TT
+CLASS="FUNCTION"
+>power_set_mode</TT
+>
+affects all power controllers. There may be circumstances when this is
+not desirable. For example if a particular device is not currently
+being used then it can be left switched off: the rest of the system
+could be moving between <SPAN
+CLASS="TYPE"
+>active</SPAN
+>, <SPAN
+CLASS="TYPE"
+>idle</SPAN
+> and
+<SPAN
+CLASS="TYPE"
+>sleep</SPAN
+> modes, but there is no point in invoking the power
+controller for the unused device. To support this the power management
+package supports the concept of attached and detached controllers. By
+default all controllers are attached, and hence will be affected by
+global mode changes. A specific controller can be detached using the
+function <TT
+CLASS="FUNCTION"
+>power_set_controller_attached</TT
+>. This
+function takes two arguments, one to specify a particular controller
+and another to specify the desired new state.
+<TT
+CLASS="FUNCTION"
+>power_get_controller_attached</TT
+> can be used to
+determine whether or not a specific controller is currently attached.</P
+><P
+>The attached or detached state of a controller only affects what
+happens during a global mode change, in other words following a call
+to <TT
+CLASS="FUNCTION"
+>power_set_mode</TT
+>. It is still possible to
+manipulate a detached controller using
+<TT
+CLASS="FUNCTION"
+>power_set_controller_mode</TT
+> or
+<TT
+CLASS="FUNCTION"
+>power_set_controller_mode_now</TT
+>.</P
+></DIV
+><DIV
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+SUMMARY="Footer navigation table"
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+><A
+HREF="power-policy.html"
+ACCESSKEY="P"
+>Prev</A
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+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+>Support for Policy Modules</TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+><A
+HREF="services-power.html"
+ACCESSKEY="U"
+>Up</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+>Implementing a Power Controller</TD
+></TR
+></TABLE
+></DIV
+></BODY
+></HTML
+>
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