linux-kernel - Re: uio: power management of user-space drivers

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Date:	Tue, 15 Feb 2011 17:40:36 -0800
From:	Greg KH <greg@...ah.com>
To:	"Benenati, Chris J" <chris.j.benenati@...el.com>
Cc:	"Hans J. Koch" <hjk@...sjkoch.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>
Subject: Re: uio: power management of user-space drivers


A: No.
Q: Should I include quotations after my reply?

http://daringfireball.net/2007/07/on_top

On Tue, Feb 15, 2011 at 04:35:16PM -0800, Benenati, Chris J wrote:
> Well, for example, a device may have complex application-driven hardware state,
> which in turn in turn can be driven by user inputs. That state will be lost when
> the system powers down.  It might be necessary to invoke the driver suspend()
> function before power is dropped, to read registers and preserve that state.
> It is definitely necessary to call the resume function to reprogram the registers
> when the power is restored.

Then write a real driver for your device if this type of "complex"
hardware state must be controlled.  Don't use UIO for things it was not
ment to be used for.

thanks,

greg k-h
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