From: thomas.petazzoni@free-electrons.com (Thomas Petazzoni)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3.9] Driver for 7-segment displays connected over GPIOs
Date: Mon, 7 Jan 2013 18:53:57 +0100 [thread overview]
Message-ID: <20130107185357.6da83d60@skate> (raw)
In-Reply-To: <20130107172340.GA32401@kroah.com>
Dear Greg Kroah-Hartman,
On Mon, 7 Jan 2013 09:23:40 -0800, Greg Kroah-Hartman wrote:
> > Not having a kernel driver means that gazillions of applications
> > re-invent the same piece of code over and over again, have to hardcode
> > the GPIO numbers for a given piece of hardware, while the kernel
> > abstract all of this very nicely.
>
> That sounds like a wonderful use of a userspace library to do this
> properly. Much like libusb does, right?
>
> I still think as this can be done in userspace, it probably should be.
So that's why we have drivers/usb/misc/usbsevseg.c in the kernel, which
uses sysfs files to output text or numbers on a 7-segment display,
while it could all be done using libusb from userspace? Seems like back
in 2008 you Signed-off-by on the patch adding this driver :-)
Thomas
--
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
next prev parent reply other threads:[~2013-01-07 17:53 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-07 16:42 [PATCH 3.9] Driver for 7-segment displays connected over GPIOs Thomas Petazzoni
2013-01-07 16:42 ` [PATCH 3.9 1/3] misc: new driver for GPIO-connected 7-segment displays Thomas Petazzoni
2013-01-07 19:43 ` Arnd Bergmann
2013-01-07 19:58 ` Thomas Petazzoni
2013-01-07 21:41 ` Arnd Bergmann
2013-02-08 22:38 ` Grant Likely
2013-02-08 22:35 ` Grant Likely
2013-01-07 16:42 ` [PATCH 3.9 2/3] arm: mvebu: add the 7-segment display DT informations to Armada 370 DB Thomas Petazzoni
2013-01-07 16:42 ` [PATCH 3.9 3/3] arm: mvebu: add the 7-segment display DT informations to Armada XP DB Thomas Petazzoni
2013-02-08 22:39 ` Grant Likely
2013-01-07 16:48 ` [PATCH 3.9] Driver for 7-segment displays connected over GPIOs Greg Kroah-Hartman
2013-01-07 17:07 ` Thomas Petazzoni
2013-01-07 17:23 ` Greg Kroah-Hartman
2013-01-07 17:40 ` Thomas Petazzoni
2013-01-07 17:43 ` Thomas Petazzoni
2013-01-07 17:56 ` H Hartley Sweeten
2013-01-07 18:02 ` Jason Cooper
2013-01-07 18:06 ` Russell King - ARM Linux
2013-01-07 17:53 ` Thomas Petazzoni [this message]
2013-01-07 18:36 ` Greg Kroah-Hartman
2013-01-07 18:38 ` Thomas Petazzoni
2013-01-07 23:05 ` Linus Walleij
2013-02-09 16:28 ` Pavel Machek
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130107185357.6da83d60@skate \
--to=thomas.petazzoni@free-electrons.com \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).