From: "H. Nikolaus Schaller" <hns@goldelico.com>
To: Marcel Holtmann <marcel@holtmann.org>,
Linus Walleij <linus.walleij@linaro.org>
Cc: Rob Herring <robh@kernel.org>,
"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
Jonathan Cameron <jic23@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>, Sebastian Reichel <sre@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Peter Hurley <peter@hurleysoftware.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Alan Cox <gnomes@lxorguk.ukuu.org.uk>,
Loic Poulain <loic.poulain@intel.com>,
Pavel Machek <pavel@ucw.cz>, NeilBrown <neil@brown.name>,
"linux-bluetooth@vger.kernel.org"
<linux-bluetooth@vger.kernel.org>,
"linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 0/9] Serial slave device bus
Date: Fri, 20 Jan 2017 15:23:46 +0100 [thread overview]
Message-ID: <C18BE7FF-2C6A-4EC3-8FB9-1E69796D1491@goldelico.com> (raw)
In-Reply-To: <41321720-85FD-4CC0-8710-BB044DA37F6F@holtmann.org>
> Am 20.01.2017 um 15:14 schrieb Marcel Holtmann <marcel@holtmann.org>:
>
> Hi Linus,
>
>>> There's still some discussion about what to do with devices that pass thru
>>> data to userspace unmodified like GPS and could still use tty device for
>>> the data path. IMO, we should treat this as a separate problem following
>>> this series. Drivers we want to convert to serdev and already in the
>>> kernel don't need this functionality.
>>
>> In my simple opinion GPSes shound live in drivers/iio/gps simply by
>> usecase association: streaming out a series of accelerometer readings
>> periodically through IIOs chardevs and other data about the physical
>> world is not any different from the GPS usecase that give you a stream
>> of coordinates on where on this planet you are.
>>
>> The fact that vendors like to defer GPS processing to userspace because
>> it is considered "secret sauce" is not the concern of the kernel community,
>> though problems like that in general is the great tragedy of our time.
>>
>> It would be fun to see a pure, reverse-engineered GPS driver in IIO.
>
> except for the pure NMEA devices. Which are pretty much defined as terminal devices using RS422 and 4800 baud. For anything non-NMEA, I would agree that using IIO might be a good option. So instead of a GPS subsystem, might just have a GPS class / type in the IIO subsystem.
Well, we could implement a default NMEA parser in the iio subsystem to
translate satellite time, geolocation, orientation, speed, and satellite
signal strengths to iio channels.
On the other hand we have to wait until all user-space GPS applications
use it and appear in wider use in distribution. Let's say in 3-4 years?
Therefore, I'd like to see NMEA records passed to user space and not
shielded completely.
And some GPS devices send extensions to the core set of NEMA records,
which might give other useful information. Having this needs some
extensibility to the iio translation or side-channels.
BR,
Nikolaus
next prev parent reply other threads:[~2017-01-20 14:24 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-16 22:54 [PATCH v2 0/9] Serial slave device bus Rob Herring
2017-01-16 22:54 ` [PATCH v2 1/9] tty: move the non-file related parts of tty_release to new tty_release_struct Rob Herring
2017-01-16 22:54 ` [PATCH v2 2/9] tty_port: allow a port to be opened with a tty that has no file handle Rob Herring
2017-01-17 14:57 ` One Thousand Gnomes
2017-01-19 13:37 ` Greg Kroah-Hartman
2017-01-19 15:05 ` Rob Herring
2017-01-19 15:23 ` Rob Herring
2017-01-16 22:54 ` [PATCH v2 3/9] tty_port: make tty_port_register_device wrap tty_port_register_device_attr Rob Herring
2017-01-16 22:54 ` [PATCH v2 4/9] tty: constify tty_ldisc_receive_buf buffer pointer Rob Herring
2017-01-19 16:24 ` Greg Kroah-Hartman
2017-01-16 22:54 ` [PATCH v2 5/9] tty_port: Add port client functions Rob Herring
2017-01-16 22:54 ` [PATCH v2 6/9] dt/bindings: Add a serial/UART attached device binding Rob Herring
2017-01-16 22:54 ` [PATCH v2 7/9] serdev: Introduce new bus for serial attached devices Rob Herring
2017-01-18 11:53 ` Frédéric Danis
2017-01-18 21:26 ` Rob Herring
2017-01-16 22:54 ` [PATCH v2 8/9] serdev: add a tty port controller driver Rob Herring
2017-01-18 12:42 ` Andy Shevchenko
2017-01-18 15:03 ` Rob Herring
2017-01-16 22:54 ` [PATCH v2 9/9] tty_port: register tty ports with serdev bus Rob Herring
2017-01-17 11:07 ` [PATCH v2 0/9] Serial slave device bus Pavel Machek
2017-01-20 1:36 ` msuchanek
2017-01-20 9:50 ` Sebastian Reichel
2017-01-20 13:44 ` Greg Kroah-Hartman
2017-01-20 13:55 ` Linus Walleij
2017-01-20 14:14 ` Marcel Holtmann
2017-01-20 14:23 ` H. Nikolaus Schaller [this message]
2017-01-20 14:22 ` GPS drivers (was Re: [PATCH v2 0/9] Serial slave device bus) Pavel Machek
2017-01-20 15:26 ` Linus Walleij
2017-01-20 16:16 ` Andy Shevchenko
2017-01-27 20:02 ` Pavel Machek
2017-01-20 20:23 ` Pavel Machek
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