linux-kernel - Re: [PATCH v5 1/9] leds: multicolor: Add sysfs interface definition

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Date:   Mon, 16 Sep 2019 08:56:14 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>, <pavel@....cz>
CC:     <robh+dt@...nel.org>, <linux-leds@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/9] leds: multicolor: Add sysfs interface definition

Hello

On 9/15/19 8:57 AM, Jacek Anaszewski wrote:
> Hi Dan,
>
> On 9/11/19 8:01 PM, Dan Murphy wrote:
>> Add a documentation of LED Multicolor LED class specific
>> sysfs attributes.
>>
>> Signed-off-by: Dan Murphy <dmurphy@...com>
>> ---
>>   .../ABI/testing/sysfs-class-led-multicolor    | 73 +++++++++++++++++++
>>   1 file changed, 73 insertions(+)
>>   create mode 100644 Documentation/ABI/testing/sysfs-class-led-multicolor
>>
>> diff --git a/Documentation/ABI/testing/sysfs-class-led-multicolor b/Documentation/ABI/testing/sysfs-class-led-multicolor
>> new file mode 100644
>> index 000000000000..4ea54c2ad4c8
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/sysfs-class-led-multicolor
>> @@ -0,0 +1,73 @@
>> +What:		/sys/class/leds/<led>/brightness
>> +Date:		Sept 2019
>> +KernelVersion:	5.5
>> +Contact:	Dan Murphy <dmurphy@...com>
>> +Description:	read/write
>> +		The multicolor class will redirect the device drivers call back
>> +		function for brightness control to the multicolor class
>> +		brightness control function.
>> +
>> +		Writing to this file will update all LEDs within the group to a
>> +		calculated percentage of what each color LED in the group is set
>> +		to.  The percentage is calculated via the equation below:
>> +
>> +		led_brightness = requested_value * led_color_intensity/led_color_max_intensity
>> +
>> +		For additional details please refer to
>> +		Documentation/leds/leds-class-multicolor.rst.
>> +
>> +		The value of the color is from 0 to
>> +		/sys/class/leds/<led>/max_brightness.
>> +
>> +What:		/sys/class/leds/<led>/colors/color_mix
>> +Date:		Sept 2019
>> +KernelVersion:	5.5
>> +Contact:	Dan Murphy <dmurphy@...com>
>> +Description:	read/write
>> +		The values written to this file should contain the intensity
>> +		values of each multicolor LED within the colors directory. The
>> +		index of given color is reported by the color_id file present in
>> +		colors/<color> directory. The index determines the position in
>> +		the sequence of	intensities on which the related intensity
>> +		should be passed to this file.
>> +
>> +		For additional details please refer to
>> +		Documentation/leds/leds-class-multicolor.rst.
> As already mentioned in the reply to Pavel - let's avoid the
> introduction of another sysfs file with multiple values.

OK for clarification remove the color_mix and color_id files and keep 
the intensity files?

Dan