On Thursday, October 2, 2003, at 02:09 PM, Fernando Urbina wrote:
> Kris has a vendor specific device and his kext loads for the device. I
> imagine that you do a SetConfiguration() and then go looking for the
> desired
> interface?
That's correct. Here's the code snippet that sets the configuration
(from com_line6_L6KUsbIo::initHardware()):
fDevice = OSDynamicCast(IOUSBDevice, provider);
// Find the first config/interface
if (fDevice->GetNumConfigurations() < 1)
{
return false;
}
cd = fDevice->GetFullConfigurationDescriptor(0);
// set the configuration to the first config
if (!cd)
{
return false;
}
if (!fDevice->open(this))
{
return false;
}
err = fDevice->SetConfiguration(this, cd->bConfigurationValue,
true);
if (err)
{
return false;
}
//-----
Here's the function that returns the interface pointer I try to open.
I'm using the first interface provided.
IOUSBInterface* com_line6_L6KUsbIo::GetProviderInterface()
{
IOUSBInterface* iface = NULL;
IOUSBFindInterfaceRequest request;
request.bInterfaceClass = kIOUSBFindInterfaceDontCare;
request.bInterfaceSubClass = kIOUSBFindInterfaceDontCare;
request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
request.bAlternateSetting = kIOUSBFindInterfaceDontCare;
if (fDevice)
{
return fDevice->FindNextInterface(NULL, &request);
}
else
{
return NULL;
}
}
> I really don't have a good answer on why it would fail. The
> IOUSBInterface::open() ends up calling IOUSBInterface::handleOpen() so
> if
> handleOpen fails, you'll get a failure. What happens at a level 7
> log? Is
> there some more info?
>
No, running the logs at level 7 doesn't yield any additional
information.
Kris Daniel
Line 6, Inc.
(p.s. - My apologies to the usb mailing list for sending the ioreg dump
& Info.plist information twice.)
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