修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/Documentation/ABI/testing/sysfs-class-led
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@@ -3,15 +3,34 @@
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 KernelVersion:	2.6.17
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 Contact:	Richard Purdie <rpurdie@rpsys.net>
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 Description:
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-		Set the brightness of the LED. Most LEDs don't
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-		have hardware brightness support, so will just be turned on for
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-		non-zero brightness settings. The value is between 0 and
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+		Set the brightness of the LED.
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+
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+		Most LEDs don't have hardware brightness support, so will
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+		just be turned on for non-zero brightness settings.
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+
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+		.. Note::
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+
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+		  For multicolor LEDs, writing to this file will update all
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+		  LEDs within the group to a calculated percentage of what
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+		  each color LED intensity is set to.
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+
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+		  The percentage is calculated for each grouped LED via
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+		  the equation below::
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+
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+		    led_brightness = brightness * multi_intensity/max_brightness
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+
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+		  For additional details please refer to
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+		  Documentation/leds/leds-class-multicolor.rst.
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+
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+		The value is between 0 and
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 		/sys/class/leds/<led>/max_brightness.
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 		Writing 0 to this file clears active trigger.
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 		Writing non-zero to this file while trigger is active changes the
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 		top brightness trigger is going to use.
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+
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+
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 What:		/sys/class/leds/<led>/max_brightness
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 Date:		March 2006
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@@ -47,10 +66,11 @@
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 Description:
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 		Set the trigger for this LED. A trigger is a kernel based source
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 		of LED events.
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+
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 		You can change triggers in a similar manner to the way an IO
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 		scheduler is chosen. Trigger specific parameters can appear in
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 		/sys/class/leds/<led> once a given trigger is selected. For
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-		their documentation see sysfs-class-led-trigger-*.
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+		their documentation see `sysfs-class-led-trigger-*`.
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 What:		/sys/class/leds/<led>/inverted
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 Date:		January 2011