linux-kernel - Re: [RFC 0/2] x86: Add support for Atheros AR1520 GPS devices

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Message-ID: <20110507003818.GA23997@kroah.com>
Date:	Fri, 6 May 2011 17:38:18 -0700
From:	Greg KH <greg@...ah.com>
To:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
Cc:	akpm@...ux-foundation.org, mingo@...hat.com, tglx@...utronix.de,
	hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org, allen.kao@...eros.com,
	roman.gezikov@...eros.com, joonas.viskari@...eros.com
Subject: Re: [RFC 0/2] x86: Add support for Atheros AR1520 GPS devices

On Fri, May 06, 2011 at 03:09:38PM -0700, Luis R. Rodriguez wrote:
> These two patches adds support for the Atheros AR1520 GPS device,
> currently only pegged onto an mrst platform. This creates a character
> device called ar1520 and lets userspace talk to it through it. My only
> concern against this approach is that it this requires a custom userspace
> application for reseting the device, waking it up and for blocking reads
> through ioctl. The character device can be used to read/write data to it
> as well.

I really don't like using a character device for this, what's wrong with
a tty device instead like other GPS devices are using today (i.e. a
number of USB GPS devices)?

I don't understand what these ioctls are supposed to be doing, can't
they map to standard tty ioctls that we already have for flow control so
that userspace doesn't have to write a whole new application just to
talk to yet-another-gps-device?

thanks,

greg k-h
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