[OpenWrt-Devel] WRT54GS v1.0 GPIO definitions in r41004

Rafał Miłecki zajec5 at gmail.com
Fri Jun 20 02:28:31 EDT 2014

On 5 June 2014 19:20, Catalin Patulea <cat at vv.carleton.ca> wrote:
> Here is dmesg also:
> http://pastebin.com/ZHXdd3PK
> Note:
> [   12.580000] gpio-keys gpio-keys.0: unable to claim gpio 6, err=-16
> [   12.660000] gpio-keys: probe of gpio-keys.0 failed with error -16
> [   12.900000] leds-gpio: probe of leds-gpio failed with error -16

This is because __gpiod_request returned -EBUSY.

Your nvram has following entries:

All of the above GPIOs are reserved by adm6996. It means registering
LEDs failed (because GPIOs 2 and 3 were already in use) and
registering buttons failed (because GPIO 6 was already in use).

Could you find out, which GPIO is connected to your reset button?
Simply export all GPIOs that you can and execute
cat /sys/class/gpio/gpio*/value
then press the reset buttong and execute
cat /sys/class/gpio/gpio*/value
again. Look for the GPIO that changed it's value.
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