#19195: Can not turn off USB power by hand on TP-Link TL-MR3420 v2.3
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Reporter: tischd | Owner: developers
Type: defect | Status: new
Priority: normal | Milestone:
Component: kernel | Version: Barrier Breaker 14.07
Keywords: mr3420, gpio, usb, power |
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Hi Devs,
I need to turn off and then back on USB power from script to overcome the
freezing of some pure quality 3G dongles, however I can not accomplish
that. I use TP-Link TL-MR3420 v2.3 router with BARRIER BREAKER (14.07,
r42625).
{{{
root@OpenWrt:~# cat /sys/kernel/debug/gpio
GPIOs 0-22, ath79:
gpio-4 (USB power ) out hi
gpio-11 (tp-link:green:3g ) out hi
gpio-12 (tp-link:green:lan4 ) out hi
gpio-13 (tp-link:green:wlan ) out hi
gpio-14 (tp-link:green:system) out lo
gpio-15 (tp-link:green:qss ) out hi
gpio-16 (WPS ) in hi
gpio-17 (Reset button ) in hi
gpio-18 (tp-link:green:wan ) out hi
gpio-19 (tp-link:green:lan1 ) out hi
gpio-20 (tp-link:green:lan2 ) out hi
gpio-21 (tp-link:green:lan3 ) out hi
root@OpenWrt:~# ls -al /sys/class/gpio/
drwxr-xr-x 2 root root 0 Jan 1 1970 .
drwxr-xr-x 19 root root 0 Jan 1 1970 ..
--w------- 1 root root 4096 Jan 1 1970 export
lrwxrwxrwx 1 root root 0 Jan 1 1970 gpio4 ->
../../devices/virtual/gpio/gpio4
lrwxrwxrwx 1 root root 0 Jan 1 1970 gpiochip0 ->
../../devices/virtual/gpio/gpiochip0
--w------- 1 root root 4096 Jan 1 1970 unexport
root@OpenWrt:~# ls -al /sys/class/gpio/gpio4/
drwxr-xr-x 2 root root 0 Jan 1 1970 .
drwxr-xr-x 4 root root 0 Jan 1 1970 ..
-rw-r--r-- 1 root root 4096 Mar 16 15:16 active_low
lrwxrwxrwx 1 root root 0 Mar 16 15:16 subsystem ->
../../../../class/gpio
-rw-r--r-- 1 root root 4096 Mar 16 15:16 uevent
-rw-r--r-- 1 root root 4096 Mar 16 15:16 value
root@OpenWrt:~# cat /sys/class/gpio/gpio4/active_low
0
root@OpenWrt:~# cat /sys/class/gpio/gpio4/value
1
root@OpenWrt:~# echo 0 > /sys/class/gpio/gpio4/value
root@OpenWrt:~# cat /sys/class/gpio/gpio4/value
1
}}}
The above is the same, whether I issue the commands before or after I
connect the 3G dongle. Dongle otherwise works well, but I need to power
that off sometimes.
Please help me out!
--
Ticket URL: <https://dev.openwrt.org/ticket/19195>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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