Elipsa USB OTG support on Elipsa

karnak · 06-07-2025, 03:40 AM

I was playing around with an Elipsa (SW 4.38.21908) and got OTG to work earlier today. I did not see a post so I'm adding it here.

To check the current USB mode:

Code:

# cat /sys/devices/platform/soc/usbc0/otg_role 
usb_device

To change it to host mode

Code:

# echo usb_host > /sys/devices/platform/soc/usbc0/otg_role
# cat /sys/devices/platform/soc/usbc0/otg_role 
usb_host

To change it back to device mode

Code:

# echo usb_device > /sys/devices/platform/soc/usbc0/otg_role

A few things I tried

- I was able to mount a usb pen and use a keyboard
- devices worked both with a regular usb to usb-c adaptor and with one of those OTG usb-c splitter cables (power of usb-c and device over usb-a)
- I was unable to use a USB Ethernet dongle though (not sure why, could be drivers)

I ran out of time for today. But maybe tomorrow or next week I'll have a deeper look.

lordeagle · 06-09-2025, 05:32 AM

Fantastic news, thanks a lot for sharing; indeed it would be great to get Ethernet going as well.

06-07-2025, 03:40 AM	#1
karnak Junior Member Posts: 2 Karma: 10 Join Date: Jun 2025 Device: none	USB OTG support on Elipsa I was playing around with an Elipsa (SW 4.38.21908) and got OTG to work earlier today. I did not see a post so I'm adding it here. To check the current USB mode: Code: # cat /sys/devices/platform/soc/usbc0/otg_role usb_device To change it to host mode Code: # echo usb_host > /sys/devices/platform/soc/usbc0/otg_role # cat /sys/devices/platform/soc/usbc0/otg_role usb_host To change it back to device mode Code: # echo usb_device > /sys/devices/platform/soc/usbc0/otg_role A few things I tried - I was able to mount a usb pen and use a keyboard - devices worked both with a regular usb to usb-c adaptor and with one of those OTG usb-c splitter cables (power of usb-c and device over usb-a) - I was unable to use a USB Ethernet dongle though (not sure why, could be drivers) I ran out of time for today. But maybe tomorrow or next week I'll have a deeper look.

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06-09-2025, 05:32 AM	#2
lordeagle Enthusiast Posts: 49 Karma: 17448 Join Date: Jun 2020 Device: Kobo Elipsa2E & Libra H20, Kindle PW3 & PW2	Fantastic news, thanks a lot for sharing; indeed it would be great to get Ethernet going as well.

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