[Bug 260] New: implement 100mA charging in Linux

bugzilla-daemon at bugzilla.openmoko.org bugzilla-daemon at bugzilla.openmoko.org
Mon Mar 12 17:42:37 CET 2007


           Summary: implement 100mA charging in Linux
           Product: OpenMoko
           Version: current svn head
          Platform: Neo1973
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: kernel
        AssignedTo: stefan at openmoko.org
        ReportedBy: laforge at openmoko.org
                CC: werner at openmoko.org

Linux should export two USB configuration descriptors that are completely
identical, with one difference:  power consumption.  The first config descriptor
should indicate 250 units (500mA), whereas the second one should indicate 50
units (100mA).

Please also note that we should verify that the 'self powered' flag in both
configurations is switched off.

Currently, we only export one descriptor with 500mA.  This means that if you
attach your fully-booted Neo1973 to a bus-powered hub (such as the DebugBoard
v2), it will not enumerate on the USB [since the host cannot provde 500mA but
the device only exports one configuration with that high current].

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