linux-kernel - Re: [PATCH v4 0/4] Bluetooth/gnss: GNSS support for TiWi chips

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Date: Mon, 10 Jun 2024 18:17:05 -0500
From: Adam Ford <aford173@...il.com>
To: Andreas Kemnade <andreas@...nade.info>
Cc: Luiz Augusto von Dentz <luiz.dentz@...il.com>, marcel@...tmann.org, johan@...nel.org, 
	pmenzel@...gen.mpg.de, jirislaby@...nel.org, gregkh@...uxfoundation.org, 
	linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org, 
	Tony Lindgren <tony@...mide.com>, tomi.valkeinen@...asonboard.com, 
	Péter Ujfalusi <peter.ujfalusi@...il.com>, robh@...nel.org, 
	hns@...delico.com
Subject: Re: [PATCH v4 0/4] Bluetooth/gnss: GNSS support for TiWi chips

On Sat, Jun 8, 2024 at 2:20 PM Andreas Kemnade <andreas@...nade.info> wrote:
>
> Hi Adam,
>
> On Sat, 8 Jun 2024 14:00:38 -0500
> Adam Ford <aford173@...il.com> wrote:
>
> > On Thu, Jun 6, 2024 at 3:19 PM Andreas Kemnade <andreas@...nade.info> wrote:
> > >
> > > Hi Luiz,
> > >
> > > On Thu, 6 Jun 2024 16:04:10 -0400
> > > Luiz Augusto von Dentz <luiz.dentz@...il.com> wrote:
> > >
> > > > Hi Andreas,
> > > >
> > > > On Thu, Jun 6, 2024 at 2:30 PM Andreas Kemnade <andreas@...nade.info> wrote:
> > > > >
> > > > > Some of these chips have GNSS support. In some vendor kernels
> > > > > a driver on top of misc/ti-st can be found providing a /dev/tigps
> > > > > device which speaks the secretive Air Independent Interface (AI2) protocol.
> >
> > I think you may have sent me a file to test, but I can't find the
> > e-mail.   Can you tell me what tool you used to test it?  I can get
> > gnss0 to enumerate, so I am close.
> >
> hmm, /bin/cat is sufficient. It should spit out nmea now by default.
>
> For playing around with raw mode, you need the ai2raw parameter
> and then you can play around with read-gps from
> https://github.com/akemnade/bt200tools
>
> > [   20.759857] hci-ti serial0-0: using DT
> > '/ocp@...00000/serial@...6c000/bluetooth-gnss' for 'enable' GPIO
> > lookup
> > [   20.770263] of_get_named_gpiod_flags: parsed 'enable-gpios'
> > property of node '/ocp@...00000/serial@...6c000/bluetooth-gnss[0]' -
> > status (0)
> > [   29.221588] gnss: GNSS driver registered with major 244
> >
> That is nice.

I think I am stuck.  The closed-sourced GPS binary that Logic PD did
was done a 3rd party which has since been sold, and Logic PD never had
the source code, I just get junk with this driver:

$GPGLL,,,,,,V,N*64
$GPRMC,,V,,,,,,,,,,N*53
$GPGGA,,,,,,0,,,,,,,,*66
$GPVTG,,T,,M,,N,,K,N*2C
$GPGSA,M,1,,,,,,,,,,,,,,,*12
$GPGSV,1,1,00*79
$GPGLL,,,,,,V,N*64
$GPRMC,,V,,,,,,,,,,N*53
$GPGGA,,,,,,0,,,,,,,,*66
$GPVTG,,T,,M,,N,,K,N*2C
$GPGSA,M,1,,,,,,,,,,,,,,,*12
$GPGSV,1,1,00*79
$GPGLL,,,,,,V,N*64
$GPRMC,,V,,,,,,,,,,N*53
$GPGGA,,,,,,0,,,,,,,,*66
$GPVTG,,T,,M,,N,,K,N*2C
$GPGSA,M,1,,,,,,,,,,,,,,,*12
$GPGSV,1,1,00*79

I am not 100% positive, but I think the antenna might be required to
be powered.  I'll talk with the HW engineer who designed the Torpedo +
Wireless SOM and see if he remembers anyhthing about the GPS.  I know
for a fact that Logic PD doesn't have the source code for their GPS
demo, and I know it doesn't work with modern kernels, so i can't
compare the performance.

:-(

adam


>
> Regards,
> Andreas