linux-kernel - Re: [PATCH 0/2] Add a skeleton module to perform a basic initialization on certain USB devices

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Date:	Sun, 24 Jan 2016 23:05:05 +0100
From:	Oliver Neukum <oneukum@...e.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Michal Malý <madcatxster@...oid-pointer.net>,
	Bjørn Mork <bjorn@...k.no>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmitry.torokhov@...il.com, jikos@...nel.org, elias.vds@...il.com,
	edwin@...ds.nl, simon@...gewell.org
Subject: Re: [PATCH 0/2] Add a skeleton module to perform a basic
 initialization on certain USB devices

On Sat, 2016-01-23 at 08:39 -0800, Greg KH wrote:
> Have your program install a udev rule to make it run automatically
> when
> the device is plugged in, and then just file a bug with the different
> distros to have them pick up your program and add it to their
> releases.
> With free services like Github to host the code, and OBS to build
> packages for every different distro out there, there has never been an
> easier time to get programs to distros.
> 
> So please just do this in userspace, we don't like to take kernel
> drivers for functions that can be done in userspace.

That raises a point. If we wish to do port power switching
as a form of runtime PM, we will need to do mode switching
in kernel space. The notion that this can be done in user space
is likely to become wrong as things develop.

	Regards
		Oliver