From: Matthias Kaehlcke <mka@chromium.org>
To: Thierry Reding <thierry.reding@gmail.com>,
Lee Jones <lee.jones@linaro.org>,
Daniel Thompson <daniel.thompson@linaro.org>,
Jingoo Han <jingoohan1@gmail.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: linux-pwm@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Enric Balletbo i Serra <enric.balletbo@collabora.com>,
Douglas Anderson <dianders@chromium.org>,
Brian Norris <briannorris@chromium.org>,
Pavel Machek <pavel@ucw.cz>,
Jacek Anaszewski <jacek.anaszewski@gmail.com>
Subject: Re: [PATCH v3 0/4] backlight: Expose brightness curve type through sysfs
Date: Mon, 22 Jul 2019 23:59:26 +0000 [thread overview]
Message-ID: <20190722235926.GA250418@google.com> (raw)
In-Reply-To: <20190709190007.91260-1-mka@chromium.org>
On Tue, Jul 09, 2019 at 12:00:03PM -0700, Matthias Kaehlcke wrote:
> Backlight brightness curves can have different shapes. The two main
> types are linear and non-linear curves. The human eye doesn't
> perceive linearly increasing/decreasing brightness as linear (see
> also 88ba95bedb79 "backlight: pwm_bl: Compute brightness of LED
> linearly to human eye"), hence many backlights use non-linear (often
> logarithmic) brightness curves. The type of curve is currently opaque
> to userspace, so userspace often relies on more or less reliable
> heuristics (like the number of brightness levels) to decide whether
> to treat a backlight device as linear or non-linear.
>
> Export the type of the brightness curve via a new sysfs attribute.
>
> Matthias Kaehlcke (4):
> MAINTAINERS: Add entry for stable backlight sysfs ABI documentation
> backlight: Expose brightness curve type through sysfs
> backlight: pwm_bl: Set scale type for CIE 1931 curves
> backlight: pwm_bl: Set scale type for brightness curves specified in
> the DT
>
> .../ABI/testing/sysfs-class-backlight | 26 ++++++++++++++
> MAINTAINERS | 2 ++
> drivers/video/backlight/backlight.c | 19 ++++++++++
> drivers/video/backlight/pwm_bl.c | 35 ++++++++++++++++++-
> include/linux/backlight.h | 8 +++++
> 5 files changed, 89 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/ABI/testing/sysfs-class-backlight
ping, any comments on v3?
Thanks
Matthias
next prev parent reply other threads:[~2019-07-22 23:59 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-09 19:00 [PATCH v3 0/4] backlight: Expose brightness curve type through sysfs Matthias Kaehlcke
2019-07-09 19:00 ` [PATCH v3 1/4] MAINTAINERS: Add entry for stable backlight sysfs ABI documentation Matthias Kaehlcke
2019-09-02 9:41 ` Lee Jones
2019-07-09 19:00 ` [PATCH v3 2/4] backlight: Expose brightness curve type through sysfs Matthias Kaehlcke
2019-08-07 20:15 ` Matthias Kaehlcke
2019-08-16 15:54 ` Daniel Thompson
2019-08-16 17:53 ` Matthias Kaehlcke
2019-08-19 10:02 ` Daniel Thompson
2019-08-19 18:50 ` Matthias Kaehlcke
2019-08-20 13:56 ` Daniel Thompson
2019-08-27 9:44 ` Lee Jones
2019-08-29 14:09 ` Daniel Thompson
2019-08-16 16:51 ` Uwe Kleine-König
2019-08-16 17:51 ` Matthias Kaehlcke
2019-08-16 19:47 ` Uwe Kleine-König
2019-08-16 21:10 ` Matthias Kaehlcke
2019-08-19 5:46 ` Uwe Kleine-König
2019-08-19 9:50 ` Daniel Thompson
2019-08-19 10:21 ` Uwe Kleine-König
2019-08-19 11:16 ` Daniel Thompson
2019-08-19 12:29 ` Uwe Kleine-König
2019-08-20 14:49 ` Daniel Vetter
2019-08-21 14:16 ` Daniel Thompson
2019-09-02 9:41 ` Lee Jones
2019-07-09 19:00 ` [PATCH v3 3/4] backlight: pwm_bl: Set scale type for CIE 1931 curves Matthias Kaehlcke
2019-09-02 9:41 ` Lee Jones
2019-07-09 19:00 ` [PATCH v3 4/4] backlight: pwm_bl: Set scale type for brightness curves specified in the DT Matthias Kaehlcke
2019-09-02 9:42 ` Lee Jones
2019-07-22 23:59 ` Matthias Kaehlcke [this message]
2019-07-25 11:15 ` [PATCH v3 0/4] backlight: Expose brightness curve type through sysfs Lee Jones
2019-07-25 17:17 ` Matthias Kaehlcke
2019-08-05 10:37 ` Lee Jones
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=20190722235926.GA250418@google.com \
--to=mka@chromium.org \
--cc=b.zolnierkie@samsung.com \
--cc=briannorris@chromium.org \
--cc=daniel.thompson@linaro.org \
--cc=dianders@chromium.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=enric.balletbo@collabora.com \
--cc=jacek.anaszewski@gmail.com \
--cc=jingoohan1@gmail.com \
--cc=lee.jones@linaro.org \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pwm@vger.kernel.org \
--cc=pavel@ucw.cz \
--cc=thierry.reding@gmail.com \
/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).