Asus RT-N10 Plus WPS led does not turn on

[Cody P Schafer <openwrt@…>]

The WPS led blinks when in tftp mode (hold reset or WPS button while powering on), but it never lights at all once linux is booted.

Examining it once booted (via /sys/class/leds/asus:green:wps) shows the brightness set at 255, but the led is not lit. Setting brightness to 0 (and once at 0 back to 255) has no effect on the physical appearance of the LED

Instructions regarding flashing the rt-n10+ with openwrt indicate that the LED did at one point work.

[Cody P Schafer <openwrt@…>]

Using the gpio interface directly as follows also has no effect:

echo gpio-leds.1 >/sys/bus/platform/drivers/leds-gpio/unbind
# 104 is the base of the gpiochip
# 14 is taken from the dts file (which copies it from the mach init file)
n=$((104+14))
echo $n >/sys/class/gpio/export
echo out >/sys/class/gpio/gpio$n/direction
echo 1 >/sys/class/gpio/gpio$n/value
sleep 1
echo 0 >/sys/class/gpio/gpio$n/value
sleep 1
echo in >/sys/class/gpio/gpio$n/direction

[Cody P Schafer <openwrt@…>]

Using the gpio api (at some risk to my hardware), I tested gpio 13 and 15 to check for an off-by-one. Neither caused any changes in any LED.

[Cody P Schafer <openwrt@…>]

comparing the regoster-map of gpio0 in rt3050.dtsi (included by NT-N10-PLUS.dts) appears to match the definitions from the vendor source release, though the vendor source does not use or define the polarity register (GPIO_REG_POL) in RT-N10+.2028/linux-2.6.21.x/drivers/char/ralink_gpio.c

[Ayyari]

I have some problem.

see the #ticket/13359

[Cody P Schafer <openwrt@…>]

I've attached a fix. Essentially, the uart mux was not getting set into GPIO mode due to an earlier patch removing the "gpio" entry from uart_mux. While I was there, I also fixed the .gpio_first and .gpio_last for a few other pin groups (.gpio_first and .gpio_last are unused, and it seems like using them means reimplimenting pinctrl).

[Cody P Schafer <openwrt@…>]

This should be solved by the solution to #13359 (which this is a dup of)