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Date:	Sun, 22 Dec 2013 11:22:06 +0100
From:	Linus Walleij <>
To:	Ivajlo Dimitrov <>,
	Linus Walleij <>,
	Shubhrajyoti Datta <>,
	Carlos Chinea <>,
	Tony Lindgren <>,
	Grant Likely <>,
	Rob Herring <>,
	Pawel Moll <>,
	Mark Rutland <>,
	Stephen Warren <>,
	Ian Campbell <>,
	Rob Landley <>,
	Benoît Cousson <>,
	"" <>,
	"" <>,
	Linux-OMAP <>,
	Pali Rohár <>,
	Ивайло Димитров <>,
	Joni Lapilainen <>,
	Aaro Koskinen <>,
	"" <>
Subject: Re: Re: [RFCv4 06/11] misc: Introduce Nokia CMT driver

On Wed, Dec 18, 2013 at 12:25 AM, Sebastian Reichel <> wrote:

> I had a look at both ofono's and's implementation
> for the GPIO handling and both implementations are very similar. I
> think it should be possible to move the state machine described in
> [0] into the kernel and provide a simple sysfs/uevent interface.
> I was thinking of something like /sys/devices/platform/nokia-cmt/state,
> which accepts "enable", "disable" and "reset" as input and outputs the
> current state.
> [0]

Yes this looks like kernel code shoehorned into userspace. As it
deals with suspending/resuming hardware for example, and that is
something the kernel needs to coordinate and do uniformly across
all devices (IMO).

A while back Arun Murthy was working on creating an embedded
modem subsystem but the development stopped. However such a
subsystem is a generic problem of general interest and this would be
one of the candidates for drivers/modem I think. Sadly creating it
may be a lot of work, I don't know exactly.

Linus Walleij
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