Re: libusb-1.0 for NetBSD

[Xiaofan Chen <xiaofanc%gmail.com@localhost>]

On Thu, May 31, 2012 at 9:05 PM, Eric Haszlakiewicz 
<erh%nimenees.com@localhost> wrote:
> On Thu, May 31, 2012 at 07:48:00AM +0800, Xiaofan Chen wrote:
>> The other possibility is to learn from Mac OS X where
>> you can use a code-less kext to prevent the existing
>> kernel driver from attaching to a device (or a class
>> of device) based on certain criteria.
>
> I don't know what "code-less kext" is, but in NetBSD you can do this with
> a custom kernel configuration that has a nailed down ugen entry, e.g.:
>
> ugen3   at uhub? port ? vendor 0x06c2 product 0x0031 flags 1
>
> The vendor and product you can get using the
> USB_GET_DEVICE_DESC ioctl, which
> I recently copied over to uhid devices.

Thanks for the tip.

> Unfortunately userconf (boot -c) doesn't seem to be capable enough to
> do this so you actually need to build a new kernel for it.

Ah if that can be done without building a new kernel, that would be great.

A code-less kext is just an XML file which can prevents Apple Mac OS X
default driver to attach to the device, but rather use the generic iokit driver
(and as a result libusb can be used for USB device).
http://developer.apple.com/library/mac/#qa/qa1076/_index.html
http://developer.apple.com/library/mac/#documentation/Darwin/Conceptual/KEXTConcept/KEXTConceptAnatomy/kext_anatomy.html

An example to use ST ST-Link V1 (using USB mass storage driver by
default) with libusb so that people can use open-source libusb based
program like OpenOCD under Mac OS X.

https://github.com/texane/stlink/tree/master/stlinkv1_macosx_driver
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd";>
<plist version="1.0">
<dict>
        <key>CFBundleDevelopmentRegion</key>
        <string>English</string>
        <key>CFBundleIdentifier</key>
        <string>com.libusb.stlink_shield</string>
        <key>CFBundleInfoDictionaryVersion</key>
        <string>6.0</string>
        <key>CFBundlePackageType</key>
        <string>KEXT</string>
        <key>CFBundleSignature</key>
        <string>????</string>
        <key>CFBundleVersion</key>
        <string>1.0.0</string>
        <key>IOKitPersonalities</key>
        <dict>
                <key>DeviceDriver</key>
                <dict>
                        <key>CFBundleIdentifier</key>
                        <string>com.apple.kpi.iokit</string>
                        <key>IOClass</key>
                        <string>IOService</string>
                        <key>IOProviderClass</key>
                        <string>IOUSBDevice</string>
                        <key>bcdDevice</key>
                        <integer>256</integer>
                        <key>idProduct</key>
                        <integer>14148</integer>
                        <key>idVendor</key>
                        <integer>1155</integer>
                </dict>
                <key>InterfaceDriver</key>
                <dict>
                        <key>CFBundleIdentifier</key>
                        <string>com.apple.kpi.iokit</string>
                        <key>IOClass</key>
                        <string>IOService</string>
                        <key>IOProviderClass</key>
                        <string>IOUSBInterface</string>
                        <key>bConfigurationValue</key>
                        <integer>1</integer>
                        <key>bInterfaceNumber</key>
                        <integer>0</integer>
                        <key>idProduct</key>
                        <integer>14148</integer>
                        <key>idVendor</key>
                        <integer>1155</integer>
                </dict>
        </dict>
        <key>OSBundleLibraries</key>
        <dict>
                <key>com.apple.iokit.IOUSBFamily</key>
                <string>1.8</string>
                <key>com.apple.kpi.libkern</key>
                <string>11.2.0</string>
        </dict>
</dict>
</plist>


-- 
Xiaofan