Document the ABI change in Documentation/ABI/testing/sysfs-class-led.
Signed-off-by: Heiner Kallweit <[email protected]>
---
v7:
- separated from patch 3
---
Documentation/ABI/testing/sysfs-class-led | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-class-led
b/Documentation/ABI/testing/sysfs-class-led
index 3646ec8..20357d5 100644
--- a/Documentation/ABI/testing/sysfs-class-led
+++ b/Documentation/ABI/testing/sysfs-class-led
@@ -7,6 +7,17 @@ Description:
have hardware brightness support so will just be turned on for
non-zero brightness settings. The value is between 0 and
/sys/class/leds/<led>/max_brightness.
+ If a driver uses the RGB LED feature then this attribute is
+ interpreted as a HSV color model value:
+ <0000000F><HHHHHHHH><SSSSSSSS><VVVVVVVV>
+ Usage of the least byte is identical to monochrome mode.
+ Saturation can be 0-255 and hue 0-251 (Colour circle is mapped
+ to 0-252). If hue and saturation both are 0 the current colour
+ is preserved and only the brightness is set. This ensures
+ backwards compatibility with monochrome mode, e.g. for
+ led_set_brightness() calls from triggers.
+ Flag F enables setting hue and saturation even if both are 0.
+ For details and examples see Documentation/leds/leds-class.txt
What: /sys/class/leds/<led>/max_brightness
Date: March 2006
--
2.7.1
