Hello. I use wp7502 + legato 20.04 how to understand that USB is connected? i want to see the USB cable is plugged in or unplugged.

I have just made a test with WP8548. // if USB is connected, /dev/usb_link will be shown in “cat /sys/power/wake_lock” root@fx30:~# cat /sys/power/wake_lock /dev/usb_link legato_wakeup_App_wakeup_app // if USB disconnect, /dev/usb_link will not be shown in “cat /sys/power/wake_lock” root@fx30:…

USB link to the board

Legato Linux distribution (Yocto project)

jyijyi July 5, 2021, 3:42pm 2

how about this?

root@swi-mdm9x28-wp:/sys/bus/platform/drivers# cat /sys/devices/78d9000.usb/power_supply/usb/online
1
root@swi-mdm9x28-wp:/sys/bus/platform/drivers# cat /sys/devices/78d9000.usb/power_supply/usb/online
0

Need to know when USB is connected to host PC

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USB link to the board

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