Switch off the usb output

suibaf · 2019-06-06T08:01:58.823Z

Hi,
is it possible with a command switch off the power of the usb port? Obviusly after I need to power it on.
BR
Fabio

suibaf · 2019-06-06T12:06:16.592Z

Something like this may be?

Turning USB power on and off

Turning USB power on and off On some routers, it is possible to turn USB power on and off using GPIO, like this: On: echo 1 > /sys/class/gpio/gpioN/value Off: echo 0 > /sys/class/gpio/gpioN/value Get current state: cat...

jeffsf · 2019-06-06T12:36:15.707Z

Which device, which firmware (including version)?

Do you want it permanently off, or to be able to control it from user space?

Some GL.iNet devices use a GPIO to control the power to the USB bus. Depending on the firmware, it may be possible to change the value at run time from user space.

suibaf · 2019-06-06T17:31:52.106Z

Hi,
router is GL-AR300M-Ext with 3.019 FW. I want to control it from user space.
Thank you.
BR

jeffsf · 2019-06-06T19:22:11.839Z

I believe that it is /sys/devices/platform/leds-gpio/leds/gl-ar300m:green:usb

root@GL-AR300M:/sys/devices/platform/leds-gpio/leds/gl-ar300m:green:usb# ls -l
-rw-r--r--    1 root     root          4096 May 30 10:07 brightness
lrwxrwxrwx    1 root     root             0 May 30 10:07 device -> ../../../leds-gpio
-r--r--r--    1 root     root          4096 May 30 10:07 max_brightness
lrwxrwxrwx    1 root     root             0 May 30 10:07 subsystem -> ../../../../../class/leds
-rw-r--r--    1 root     root          4096 May 30 10:07 trigger
-rw-r--r--    1 root     root          4096 May 30 10:07 uevent

The following is unchecked, as I am not somewhere that I can confirm that it works, but I believe that

echo 0 > brightness

should turn it off and that

cat max_brightness > brightness

should turn it back on.

From target/linux/ar71xx/files/arch/mips/ath79/mach-gl-ar300m.c

#define GL_AR300M_GPIO_LED_USB          2

corresponds with GL-AR300M (Shadow) - GL.iNet Docs