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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
><HEAD
><TITLE
>Attached and Detached Controllers</TITLE
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><H1
><A
NAME="POWER-ATTACHED">Attached and Detached Controllers</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN15902"
></A
><H2
>Name</H2
>Attached and Detached Controllers&nbsp;--&nbsp;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 &lt;cyg/power/power.h&gt;</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
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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [power-attached.html] - Rev 199
