a2109 USB OTG charging (charging while hosting)?

Discussion in 'Lenovo IdeaTab A2109 Development' started by drcrash, Mar 27, 2013.

  1. drcrash

    drcrash Member

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    My understanding is that the OTG (micro) USB port on the a2109 can't currently be used for charging while it's being used in host mode. (That is, to host peripherals with a host cable, as opposed to plugging the a2109 into a host PC as a peripheral.)

    BUT some Tegra 3-based machines (Nexus 7?) CAN charge in host mode, with a kind of Y cable (a "host mode cable with power") that you plug into a power supply, if you have an appropriate kernel. (Host mode charging is standardized in the OTG spec, but I don't know if all OTG hardware supports it... maybe it does on other SOC's with OTG, too.)

    My guess would be that the a2109 could charge in host mode, too, if the appropriate code was included in the kernel; I don't know of any special hardware requirements, and my impression is that it's a matter of the kernel taking proper advantage of the Tegra 3 OTG circuitry that's already there.

    That would be VERY cool, allowing the OTG USB port plus the HDMI out to be used as a docking port, without depending on any proprietary connectors. IMO the biggest weakness of the a2109 is that it doesn't have a docking solution, and being able to dock it with non-proprietary connectors would be a big strength.

    Does anybody know if things are headed that way, e.g., the right OTG code being incorporated into the kernel for all Tegra 3 machines? Are such kernels available now for rooted machines?

    Thanks in advance for any info.
     
  2. Pirondello

    Pirondello Member

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    Try using a well powered USB hub where the ports give enough amperes, then your A2109 should charge via OTG cable. Hardware & software allow charging through OTG.
     
    Last edited: Mar 27, 2013
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  3. drcrash

    drcrash Member

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    Very cool. I will definitely try that.

    EDIT:

    Just making sure we're on the same page... I'm talking about charging the tablet itself, not whatever's plugged into it.

    I HAVE tried to charge it via a host mode cable with power, using the Lenovo 2.1 amp power supply it came with on the power input of the cable, and that did not work. Unless that's not enough power to trigger host charging, I don't see how using a powered hub would be any different. (But maybe there's something I don't understand.)
     
    Last edited: Mar 28, 2013
  4. AndreasWatch

    AndreasWatch Member

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    Last edited: Apr 9, 2013

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