linux-kernel - Re: [PATCH v4] Add multicolor support to BlinkM LED driver

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Date: Thu, 11 Jan 2024 10:58:38 +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 v4] Add multicolor support to BlinkM LED driver

On Sat, 06 Jan 2024, Joseph Strauss wrote:

> Add 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. The struct led_classdev
> for the regular sysfs classes remain. The blinkm_probe function checks
> CONFIG_LEDS_BLINKM_MULTICOLOR to decide whether to load the seperate
> sysfs classes or the single multicolor one, but never both. 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.
> 
> All of the feedback has been much appreciated. Thanks!
> 
> 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()
> Changes in v3:
> - Add CONFIG_LEDS_BLINKM_MULTICOLOR to check whether to use multicolor
>   funcitonality
> - Extend well-known-leds.txt to include standard names for RGB and indicator
>   LEDS
> - Change name of Blinkm sysfs class according to well-known-leds.txt
> - Simplify struct blinkm_led and struct blinkm_data
> - Remove magic numbers
> - Fix formatting errors
> - Remove unrelated changes
> Changes in v4:
> - Fix indentation
> - Add default case to switch statement
> 
>  Documentation/leds/leds-blinkm.rst     |  27 ++-
>  Documentation/leds/well-known-leds.txt |   8 +
>  drivers/leds/Kconfig                   |   8 +
>  drivers/leds/leds-blinkm.c             | 217 +++++++++++++++++--------
>  4 files changed, 185 insertions(+), 75 deletions(-)

FYI: I won't be reviewing this until all of the build-bots are happy.

-- 
Lee Jones [李琼斯]