Thank you, scott! That was indeed the problem.
On 6/13/17, 4:54 PM, "[email protected]" <[email protected]> wrote:
Hi Brant,
It sounds like you may still be matching against IOUSBInterface or
IOUSBDevice classes; have you updated your plist's matching personality to
match on IOUSBHostInterface or IOUSBHostDevice?
Thanks,
—scott
> On Jun 13, 2017, at 2:49 PM, Brant Merryman <[email protected]>
wrote:
>
> Hi. I'm working on updating a USB serial driver. I want to update it to
use the new IOUSBHost classes. We have a driver class that derives from
IOSerialDriverSync. In the existing driver, we override the start method which
takes an IOService and use OSDynamicCast to get an IOUSBInterface. I expected
that I could call OSDyanamicCast(IOUSBHostInterface, provider) and get an
IOUSBHostInterface. However, this does not work (returns NULL). I tried getting
other interfaces such as IOUSBHostDevice and a few others, but alas they all
returned NULL.
>
> Is there a way to print out the derived class?
>
> Why has this behavior changed? Is there documentation that details what
has changed with these APIs to help me understand how to fix this? I only see a
limited amount of information in the header files.
>
> Thanks.
>
>
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