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+
+Multi Color LED handling under Linux
+=================================================
+
+Author: Dan Murphy <dmurphy@ti.com>
+
+Description
+-----------
+There are varying monochrome LED colors available for application.  These
+LEDs can be used as a single use case LED or can be mixed with other color
+LEDs to produce the full spectrum of color.  Color LEDs that are grouped
+can be presented under a single LED node with individual color control.
+The multicolor class groups these LEDs and allows dynamically setting the value
+of a single LED or setting the intensity values of the LEDs in the group and
+updating the LEDs virtually simultaneously.
+
+Multicolor Class Control
+-------------------------
+The multicolor class presents the LED groups under a directory called "colors".
+This directory is a child under the LED parent node created by the led_class
+framework.  The led_class framework is documented in led-class.txt within this
+documentation directory.
+
+Each colored LED is given its own directory.  These directories can be, but not
+limited to red, green, blue, white, amber, yellow and violet.  Under these
+directories the intensity and max_intensity files are presented for each LED.
+
+
+Directory Layout Example
+------------------------
+root:/sys/class/leds/rgb:grouped_leds# ls -lR colors/
+colors/:
+drwxr-xr-x    2 root     root             0 Jun 28 20:21 blue
+drwxr-xr-x    2 root     root             0 Jun 28 20:21 green
+drwxr-xr-x    2 root     root             0 Jun 28 20:21 red
+-rw-------    1 root     root          4096 Jun 28 20:21 color_mix
+
+colors/blue:
+-rw-------    1 root     root          4096 Jun 28 20:21 intensity
+-r--------    1 root     root          4096 Jun 28 20:27 max_intensity
+-r--------    1 root     root          4096 Jun 28 20:21 color_id
+
+colors/green:
+-rw-------    1 root     root          4096 Jun 28 20:22 intensity
+-r--------    1 root     root          4096 Jun 28 20:27 max_intensity
+-r--------    1 root     root          4096 Jun 28 20:21 color_id
+
+colors/red:
+-rw-------    1 root     root          4096 Jun 28 20:21 intensity
+-r--------    1 root     root          4096 Jun 28 20:27 max_intensity
+-r--------    1 root     root          4096 Jun 28 20:21 color_id
+
+Multicolor Color Mixing
+-----------------------
+Multicolor monochrome LEDs intensity can be modified and mixed to produce a
+varying array of colors.  The color_mix file gives the user the ability to write
+all the monochrome LEDs registered in the directory with a single call.
+To create a specific color from monochrome LEDs the color_mix file needs to be
+written with each color's intensity.  The order in which the monochrome LEDs
+should be written is based on the colors color_id.
+
+For example:
+cat /sys/class/leds/rgb:grouped_leds/red/color_id
+0
+cat /sys/class/leds/rgb:grouped_leds/green/color_id
+1
+cat /sys/class/leds/rgb:grouped_leds/blue/color_id
+2
+
+red - color_id = 0
+green - color_id = 1
+blue - color_id = 2
+
+These id's are the order in which to write the color_mix file.
+
+echo "<red> <green> <blue>" > color_mix
+
+echo "0x80 0x00 0x80" > color_mix
+
+The order of the monochrome LEDs are determined during multicolor class
+registration and will not change unless unregistered and re-registered.
+
+Other example with amber monochrome LED:
+blue - color_id = 0
+amber - color_id = 1
+
+In this exampe blue is at ID 0 and amber ID is 1 so the user would write
+echo "<blue> <amber>" > color_mix
+
+echo "0x38 0x80" > color_mix
+
+If a single monochrome LED needs to be modified then the user would write the
+colors/<color>/intensity file.
+
+
+Multicolor Class Brightness Control
+-----------------------------------
+The multiclor class framework will calculate each monochrome LEDs intensity.
+
+The brightness level for each LED is calculated based on the color LED
+intensity setting divided by the color LED max intensity setting multiplied by
+the requested value.
+
+led_brightness = requested_value*(led_color_intensity/led_color_max_intensity)
+
+Example:
+Three LEDs are present in the group as defined in "Directory Layout Example"
+within this document.
+
+A user first writes the color LED brightness file with the brightness level that
+is neccesary to achieve a blueish violet output from the RGB LED group.
+
+echo 138 > /sys/class/leds/rgb:grouped_leds/red/intensity
+echo 43 > /sys/class/leds/rgb:grouped_leds/green/intensity
+echo 226 > /sys/class/leds/rgb:grouped_leds/blue/intensity
+
+red -
+	intensity = 138
+	max_intensity = 255
+green -
+	intensity = 43
+	max_intensity = 255
+blue -
+	intensity = 226
+	max_intensity = 255
+
+The user can control the brightness of that RGB group by writing the parent
+'brightness' control.  Assuming a parent max_brightness of 255 the user may want
+to dim the LED color group to half.  The user would write a value of 128 to the
+parent brightness file then the values written to each LED will be adjusted
+base on this value
+
+cat /sys/class/leds/rgb:grouped_leds/max_brightness
+255
+echo 128 > /sys/class/leds/rgb:grouped_leds/brightness
+
+adjusted_red_value = 128 * (138/255) = 69
+adjusted_green_value = 128 * (43/255) = 21
+adjusted_blue_value = 128 * (226/255) = 113
+
+Reading the parent brightness file will return the current brightness value of
+the color LED group.
+
+cat /sys/class/leds/rgb:grouped_leds/max_brightness
+255
+
+echo 128 > /sys/class/leds/rgb:grouped_leds/brightness
+
+cat /sys/class/leds/rgb:grouped_leds/max_brightness
+128
+
+
