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

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Message-ID: <Y7xHQLlSNisUboCH@google.com>
Date:   Mon, 9 Jan 2023 16:56:32 +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

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]