linux-kernel - Re: [PATCH v2] Add multicolor support to BlinkM LED driver

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Date:   Wed, 1 Mar 2023 14:26:29 +0000
From:   Lee Jones <lee@...nel.org>
To:     Joseph Strauss <jstrauss@...lbox.org>
Cc:     pavel@....cz, jansimon.moeller@....de, conor@...nel.org,
        christophe.jaillet@...adoo.fr, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Add multicolor support to BlinkM LED driver

Pavel,

I see that you are active again - please could you prioritise this one.

> On Tue, 27 Dec 2022, Joseph Strauss wrote:
> 
> > Added multicolor support to the BlinkM driver, making it easier to
> > control from userspace. The BlinkM LED is a programmable RGB LED. The
> > driver currently supports only the regular LED sysfs class, resulting in
> > the creation of three distinct classes, one for red, green, and blue.
> > The user then has to input three values into the three seperate
> > brightness files within those classes. The multicolor LED framework
> > makes the device easier to control with the multi_intensity file: the
> > user can input three values at once to form a color, while still
> > controlling the lightness with the brightness file.
> > 
> > The main struct blinkm_led has changed slightly. A struct
> > led_classdev_mc has been added to represent the multicolor sysfs class,
> > and an additional struct led_classdev pointer has been added for
> > convenience, which points to the struct led_classdev within struct
> > led_classdev_mc. The struct led_classdev for the regular sysfs classes
> > remain. Additionally, a field representing the multicolor LED has been
> > added to the struct blinkm_data, seperate from the blinkm_leds[3] array.
> > 
> > In the blinkm_probe function, the multicolor LED class is registered
> > after the regular LED classes. The blinkm_set_mc_brightness() function
> > had to be added to calculate the three color components and then set the
> > fields of the blinkm_data structure accordingly.
> > 
> > Signed-off-by: Joseph Strauss <jstrauss@...lbox.org>
> > ---
> > Changes in v2:
> > - Replaced instances of the constant 3 with NUM_LEDS, where applicable
> > - Fixed formatting errors
> > - Replaced loop inside of blinkm_set_mc_brightness() with equivalent
> >   statements
> > - Changed id of multicolor class from 4 to 3
> > - Replaced call to devm_kmalloc_array() with devm_kcalloc()
> > 
> >  Documentation/leds/leds-blinkm.rst |  26 +++++-
> >  drivers/leds/Kconfig               |   1 +
> >  drivers/leds/leds-blinkm.c         | 143 +++++++++++++++++++++++------
> >  3 files changed, 137 insertions(+), 33 deletions(-)
> 
> Another one for Pavel until I can build some knowledge.
> 
> -- 
> Lee Jones [李琼斯]

-- 
Lee Jones [李琼斯]