Russ
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On Tuesday, October 7, 2003, at 01:16 PM, Les wrote:
I have a CDC class-compliant ADSL modem.
0. The shipping AppleUSBCDCDriver is an initial matching candiate
for the ADSL device, based on the bDeviceClass and bDeviceSubClass
in the plist personality. However, the start() function does
further checking of other descriptor values and finally does not
match the device. It appears the AppleUSBCDCDriver is only for
serial-port type devices, such as POTS modems. Is this true?
1. It appears the AppleUSBCDCSampleDriver also is only for
serial-port type devices, such as POTS modems. Is this correct?
This is correct.
2. It appears there is no shipping Apple driver for USB CDC
ethernet devices. Is this true?
We have never seen a true CDC Ethernet compliant device yet.
3. Are there any plans for an Apple-supplied driver for
CDC-compliant ethernet devices? We'd like to know if we really
need to write a driver for our device.
If there are compliant devices we will ship a driver.
4. I see there are two CDC sample drivers, AppleUSBCDCSampleDriver
and USBCDCEthernet. Is the USBCDCEthernet sample the correct
sample to use as a basis for a driver for this ADSL modem (rather
than AppleUSBCDCSampleDriver)?
The USBCDCEthernetSample is the correct sample to use for this device.
5. The USBCDCEthernet sample plist personality doesn't have
matching criteria for bDeviceClass, but rather for PID and VID.
Is there any reason why I shouldn't make my driver match on the
device class instead of the PID/VID?
It was deliberately done this way but you can change the criteria
easily enough.
6. Why is AppleUSBCDCDriver.kext inside of
IOUSBFamily.kext/Contents/Plugins instead of directly under
/System/Library/Extensions ?
It works fine in either place but the AppleUSBCDCDriver is considered
part of the family.
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