linux-kernel - Re: [Letux-kernel] [PATCH v5 3/5] misc serdev: Add w2sg0004 (gps receiver) power control driver

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Date:   Mon, 26 Mar 2018 15:59:20 +0200
From:   Pavel Machek <pavel@....cz>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Johan Hovold <johan@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>,
        Benoît Cousson <bcousson@...libre.com>,
        Arnd Bergmann <arnd@...db.de>,
        Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel@...a-handheld.com, Russell King <linux@...linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Kevin Hilman <khilman@...libre.com>,
        Thierry Reding <treding@...dia.com>,
        Andreas Färber <afaerber@...e.de>,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [Letux-kernel] [PATCH v5 3/5] misc serdev: Add w2sg0004 (gps
 receiver) power control driver

Hi!

> > No, we need some kind of at least rudimentary gps framework even if we
> > allow for a raw (NMEA) interface for the time being (possibly
> > indefinitely).
> 
> Ok, that would be fine if we can get that!
> 
> For a minimal set of API I think something like this (following hci_dev) would suffice:
> 
> struct gps_dev {
> 	...
> 	int (*open)(struct gps_dev *gdev);
> 	int (*close)(struct gps_dev *gdev);
> 	int (*send)(struct gps_dev *gdev, char *data, int length);
> };
> 
> int gps_register_dev(struct gps_dev *gdev);
> void gps_unregister_dev(struct gps_dev *gdev);
> int gps_recv_nmea_chars(struct gps_dev *gdev, char *data, int length);
> 
> If that would wrap all creation of some /dev/ttyGPS0 (or however it is called),
> it would fit our needs for a driver and user-space for our system.
> 
> And I would be happy to get rid of creating and registering a /dev/ttyGPS0
> in the w2sg0004 driver.

Sounds like a good start.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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