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List:       kde-hardware-devel
Subject:    [Kde-hardware-devel] Using Multiple backends
From:       Christopher Blauvelt <cblauvelt () gmail ! com>
Date:       2006-02-14 12:32:14
Message-ID: ffa898c90602140432o6ca4fc3eyc85b24fd3f752306 () mail ! gmail ! com
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I've started to implement a gphoto2 backend for camera support.  What
mechanism is planned to use multiple backends at the same time.  Currently,
as far as I can tell, when the backend is loaded it unloads whatever was
loaded before.  This doesn't matter right now since there is only one
backend.  What mechanism is planned to allow different ifaces to be
controlled by different backends?
Here are some of the issues that I see.  Different backends could have
redundancy, or implementing the same ifaces.  A method is needed to choose
which ifaces will be controlled by which backend.  Perhaps a ranking sytem
would allow this to be more automatic.  Additionally we need to be able to
force an iface to be controlled by a certain backend in case there are
exceptions.
As a note, yes gphoto2 can use hal as a detection system.  It does have the
ability to detect cameras on it's own.  This allows it to be used when hal
is not available or not desired.
Chris

[Attachment #5 (text/html)]

<div>I've started to implement a gphoto2 backend for camera support.&nbsp; =
What mechanism is planned to use multiple backends at the same time.&nbsp; =
Currently, as far as I can tell, when the backend is loaded it unloads what=
ever was loaded before.&nbsp; This doesn't matter right now since there is =
only one backend.&nbsp; What mechanism is planned to allow different ifaces=
 to be controlled by different backends?
</div>
<div>Here are some of the issues that I see.&nbsp; Different backends could=
 have redundancy, or implementing the same ifaces.&nbsp; A method is needed=
 to choose which ifaces will be controlled by which backend.&nbsp; Perhaps =
a ranking sytem would allow this to be more automatic.&nbsp; Additionally w=
e need to be able to force an iface to be controlled by a certain backend i=
n case there are exceptions.
</div>
<div>As a note, yes gphoto2 can use hal as a detection system.&nbsp; It doe=
s have the ability to detect cameras on&nbsp;it's own.&nbsp; This&nbsp;allo=
ws it to be used when hal is not available or not desired.</div>
<div>Chris&nbsp;</div>


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