I know that the OK LED can be accessed from /sys/class/leds/led0, but the FDX and 100 are not. I can see from /sys/class/net/eth0/duplex and /sys/class/net/eth0/speed that the files seem to correspond with the leds. I can not write to /sys/class/net/eth0/speed or duplex, even as superuser. Is it possible to write to the file from a kernel module? I am on Arch.
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1 Answer
Although the LAN9512 datasheet says that the pins used to drive the speed and duplex LEDs can be used for GPIO as far as I can tell there is no support in the linux kernel module to actually switch the pins on the LAN9512 into GPIO mode.
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I am looking to control the FDX, 100, and LNK LEDs from C/C++. According to raspberrypi.org/phpBB3//viewtopic.php?p=136266#p136266, they are hardwired to the Ethernet chip.– built1nAug 20, 2013 at 22:38
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Right the ethernet chip is the LAN9512, it is also a USB hub. I could not even find any clear information about how to use those pins for GPIO in the LAN9512 documentation, only that that they could be used as GPIO pins.– CraigAug 21, 2013 at 16:02