[android-kernel] Re: USB cdc_acm was not recognized by host

[Squall.Hung]

Thanks All,

I found the root cause and solved it on device side.
In my cause bMasterInterface and bSlaveInterface of usb_cdc_union_desc
are not correctly mapped to host side (usb interface generation).
Temporary I changed the sequence of usb function initialization (make
acm be as first one initialzation) to solve it.

static struct usb_cdc_union_desc acm_union_desc  = {
        .bLength =              sizeof(acm_union_desc),
        .bDescriptorType =      USB_DT_CS_INTERFACE,
        .bDescriptorSubType =   USB_CDC_UNION_TYPE,
        /* .bMasterInterface0 = DYNAMIC */
        /* .bSlaveInterface0 =  DYNAMIC */
};

br,
Chihchia

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