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Message-Id: <20250421-leds-doc-v1-1-9a32df7fc6f4@yoseli.org> Date: Mon, 21 Apr 2025 18:48:10 +0200 From: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org> To: Lee Jones <lee@...nel.org>, Pavel Machek <pavel@...nel.org>, Jonathan Corbet <corbet@....net> Cc: linux-leds@...r.kernel.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org> Subject: [PATCH] Documentation: leds: improve readibility of multicolor doc When reading the documentation of multicolor leds, the HTML output is not easy to read. Improve it by adding a few markups, splitting the console in a dedicated block. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org> --- Documentation/leds/leds-class-multicolor.rst | 82 +++++++++++++++++----------- 1 file changed, 51 insertions(+), 31 deletions(-) diff --git a/Documentation/leds/leds-class-multicolor.rst b/Documentation/leds/leds-class-multicolor.rst index c57b98bfd38715b705c555efeb8e5f9076b1b787..c6b47b4093c47360b238b49d3cbfa055a9b484e5 100644 --- a/Documentation/leds/leds-class-multicolor.rst +++ b/Documentation/leds/leds-class-multicolor.rst @@ -18,24 +18,28 @@ array. These files are children under the LED parent node created by the led_class framework. The led_class framework is documented in led-class.rst within this documentation directory. -Each colored LED will be indexed under the multi_* files. The order of the -colors will be arbitrary. The multi_index file can be read to determine the +Each colored LED will be indexed under the ``multi_*`` files. The order of the +colors will be arbitrary. The ``multi_index`` file can be read to determine the color name to indexed value. -The multi_index file is an array that contains the string list of the colors as -they are defined in each multi_* array file. +The ``multi_index`` file is an array that contains the string list of the colors as +they are defined in each ``multi_*`` array file. -The multi_intensity is an array that can be read or written to for the +The ``multi_intensity`` is an array that can be read or written to for the individual color intensities. All elements within this array must be written in order for the color LED intensities to be updated. Directory Layout Example ======================== -root:/sys/class/leds/multicolor:status# ls -lR --rw-r--r-- 1 root root 4096 Oct 19 16:16 brightness --r--r--r-- 1 root root 4096 Oct 19 16:16 max_brightness --r--r--r-- 1 root root 4096 Oct 19 16:16 multi_index --rw-r--r-- 1 root root 4096 Oct 19 16:16 multi_intensity +.. code-block:: console + + root:/sys/class/leds/multicolor:status# ls -lR + -rw-r--r-- 1 root root 4096 Oct 19 16:16 brightness + -r--r--r-- 1 root root 4096 Oct 19 16:16 max_brightness + -r--r--r-- 1 root root 4096 Oct 19 16:16 multi_index + -rw-r--r-- 1 root root 4096 Oct 19 16:16 multi_intensity + +.. Multicolor Class Brightness Control =================================== @@ -43,27 +47,31 @@ The brightness level for each LED is calculated based on the color LED intensity setting divided by the global max_brightness setting multiplied by the requested brightness. -led_brightness = brightness * multi_intensity/max_brightness +``led_brightness = brightness * multi_intensity/max_brightness`` Example: A user first writes the multi_intensity file with the brightness levels for each LED that are necessary to achieve a certain color output from a multicolor LED group. -cat /sys/class/leds/multicolor:status/multi_index -green blue red +.. code-block:: console + + # cat /sys/class/leds/multicolor:status/multi_index + green blue red -echo 43 226 138 > /sys/class/leds/multicolor:status/multi_intensity + # echo 43 226 138 > /sys/class/leds/multicolor:status/multi_intensity -red - - intensity = 138 - max_brightness = 255 -green - - intensity = 43 - max_brightness = 255 -blue - - intensity = 226 - max_brightness = 255 + red - + intensity = 138 + max_brightness = 255 + green - + intensity = 43 + max_brightness = 255 + blue - + intensity = 226 + max_brightness = 255 + +.. The user can control the brightness of that multicolor LED group by writing the global 'brightness' control. Assuming a max_brightness of 255 the user @@ -71,16 +79,28 @@ may want to dim the LED color group to half. The user would write a value of 128 to the global brightness file then the values written to each LED will be adjusted base on this value. -cat /sys/class/leds/multicolor:status/max_brightness -255 -echo 128 > /sys/class/leds/multicolor:status/brightness +.. code-block:: console + + # cat /sys/class/leds/multicolor:status/max_brightness + 255 + # echo 128 > /sys/class/leds/multicolor:status/brightness -adjusted_red_value = 128 * 138/255 = 69 -adjusted_green_value = 128 * 43/255 = 21 -adjusted_blue_value = 128 * 226/255 = 113 +.. + +.. code-block:: none + + adjusted_red_value = 128 * 138/255 = 69 + adjusted_green_value = 128 * 43/255 = 21 + adjusted_blue_value = 128 * 226/255 = 113 + +.. Reading the global brightness file will return the current brightness value of the color LED group. -cat /sys/class/leds/multicolor:status/brightness -128 +.. code-block:: console + + # cat /sys/class/leds/multicolor:status/brightness + 128 + +.. --- base-commit: 9d7a0577c9db35c4cc52db90bc415ea248446472 change-id: 20250421-leds-doc-dd85db13fda4 Best regards, -- Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
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