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

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Message-ID: <20190911180115.21035-2-dmurphy@ti.com>
Date:   Wed, 11 Sep 2019 13:01:07 -0500
From:   Dan Murphy <dmurphy@...com>
To:     <jacek.anaszewski@...il.com>, <pavel@....cz>
CC:     <robh+dt@...nel.org>, <linux-leds@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Dan Murphy <dmurphy@...com>
Subject: [PATCH v5 1/9] leds: multicolor: Add sysfs interface definition

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.
+
+What:		/sys/class/leds/<led>/colors/<led_color>/color_id
+Date:		Sept 2019
+KernelVersion:	5.5
+Contact:	Dan Murphy <dmurphy@...com>
+Description:	read only
+		This file when read will return the index of the color in the
+		color_mix.
+
+		For additional details please refer to
+		Documentation/leds/leds-class-multicolor.rst.
+
+What:		/sys/class/leds/<led>/colors/<led_color>/intensity
+Date:		Sept 2019
+KernelVersion:	5.5
+Contact:	Dan Murphy <dmurphy@...com>
+Description:	read/write
+		The led_color directory is dynamically created based on the
+		colors defined by the registrar of the class.
+		The led_color can be but not limited to red, green, blue,
+		white, amber, yellow and violet.  There is one directory per color
+		presented.  The brightness file is created under each
+		led_color directory and controls the individual LED color
+		setting.
+
+		The value of the color is from 0 to
+		/sys/class/leds/<led>/colors/<led_color>/max_intensity.
+
+What:		/sys/class/leds/<led>/colors/<led_color>/max_intensity
+Date:		Sept 2019
+KernelVersion:	5.5
+Contact:	Dan Murphy <dmurphy@...com>
+Description:	read only
+		Maximum intensity level for the LED color, default is
+		255 (LED_FULL).
+
+		If the LED does not support different intensity levels, this
+		should be 1.
-- 
2.22.0.214.g8dca754b1e