Re: Control USB Power
Re: Control USB Power
- Subject: Re: Control USB Power
- From: Mike Abdullah <email@hidden>
- Date: Thu, 12 Jun 2008 23:08:52 -0700
On 12 Jun 2008, at 23:01, David Duncan wrote:
On Jun 12, 2008, at 10:38 PM, Omar Qazi wrote:
I have a Cocoa application that controls an external USB device. I
want to be able to turn the device off when the user performs some
action, like click a button. Is there a way in Cocoa or IOKit to
disable power to a USB Socket? The application runs on Leopard.
Are you really sure you want to turn off the USB socket itself? It
would seem to me that you really want to use a device that has
software control over its power state instead and that you would
just send the proper message to turn it on or off rather than
turning off the USB socket. That said, I have no idea if what you
are asking is possible...
In particular, consider the scenario of the device plugged into a USB
hub. If you turn off the computer's USB port, any other devices on the
hub are screwed. Furthermore, the hub may well provide its own power
connection, regardless of the computer, and almost certainly has no
electronics to disable power that you can communicate with anyway.
Mike.
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