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Re: kIOReturnExclusiveAccess from USBInterfaceOpen()

Here's the IOService plane dump, the device is on the USB bus. The machine is a dual-G4, and the OS is 10.2.8. I loaded the kext without the 2nd open attempt, saw the failure in USB Prober's USB Log, and dumped the IOService plane as instructed.

| | | +-o GuitarPort@1b100000 <class IOUSBDevice>
| | | | {
| | | | "bDeviceSubClass" = 0
| | | | "bcdDevice" = 1
| | | | "idVendor" = 3649
| | | | "IOUserClientClass" = "IOUSBDeviceUserClient"
| | | | "USB Vendor Name" = "Line 6"
| | | | "iManufacturer" = 1
| | | | "Device Speed" = 1
| | | | "sessionID" = 143872086340
| | | | "locationID" = 454033408
| | | | "iProduct" = 2
| | | | "bDeviceProtocol" = 0
| | | | "bDeviceClass" = 255
| | | | "PortNum" = 1
| | | | "idProduct" = 18256
| | | | "Bus Power Available" = 250
| | | | "bMaxPacketSize0" = 8
| | | | "USB Address" = 2
| | | | "USB Product Name" = "GuitarPort"
| | | | "IOCFPlugInTypes" = {"9dc7b780-9ec0-11d4-a54f-000a27052861"="IOUSBFamily.kext/Contents/ PlugIns/IOUSBLib.bundle"}
| | | | "bNumConfigurations" = 1
| | | | "iSerialNumber" = 0
| | | | }
| | | |
| | | +-o com_line6_L6KUsbIo <class com_line6_L6KUsbIo>
| | | | | {
| | | | | "bcdDevice" = 1
| | | | | "idVendor" = 3649
| | | | | "Power Management private data" = "{ this object = 0252da00, interested driver = 0252da00, driverDesire = 1, deviceDesire = 0, ourDesiredPowerState = 1, previousRequest = 2 }"
| | | | | "AudioEngines" = ({"NumStreams"=1,"Formats"=({"IOAudioStreamSampleFormat"="1819304813","I OAudioStreamAlignment"=1,"IOAudioStreamBitWidth"=16,"IOAudioStreamNumeri cRepresentation"=1936289396,"IOAudioStream$
| | | | | "IOProviderClass" = "IOUSBDevice"
| | | | | "IOAudioDeviceManufacturerName" = "Line 6"
| | | | | "CFBundleIdentifier" = "com.line6.driver.guitarport"
| | | | | "IOAudioDeviceShortName" = "GuitarPort"
| | | | | "Power Management protected data" = "{ theNumberOfPowerStates = 2, version 1, power state 0 = { capabilityFlags 00000000, outputPowerCharacter 00000000, inputPowerRequirement 00000000, staticPower 0, unb$
| | | | | "IOMatchCategory" = "IODefaultMatchCategory"
| | | | | "IOClass" = "com_line6_L6KUsbIo"
| | | | | "IOAudioDeviceName" = "Line 6 GuitarPort"
| | | | | "idProduct" = 18256
| | | | | "IOProbeScore" = 100000
| | | | | }
| | | | |
| | | | +-o AppleUSBAudioEngine <class AppleUSBAudioEngine>
| | | | {
| | | | "IOAudioEngineSampleOffset" = 0
| | | | "IOAudioStreamSampleFormatByteOrder" = "Little Endian"
| | | | "IOAudioEngineGlobalUniqueID" = "AppleUSBAudioEngine:Line 6:GuitarPort:100000:0"
| | | | "IOAudioEngineState" = 0
| | | | }
| | | |
| | | +-o IOUSBInterface@0 <class IOUSBInterface>
| | | | | {
| | | | | "bcdDevice" = 1
| | | | | "idVendor" = 3649
| | | | | "iInterface" = 0
| | | | | "IOUserClientClass" = "IOUSBInterfaceUserClient"
| | | | | "bConfigurationValue" = 1
| | | | | "bInterfaceNumber" = 0
| | | | | "bInterfaceSubClass" = 0
| | | | | "bInterfaceProtocol" = 0
| | | | | "locationID" = 454033408
| | | | | "bNumEndpoints" = 2
| | | | | "IOCFPlugInTypes" = {"2d9786c6-9ef3-11d4-ad51-000a27052861"="IOUSBFamily.kext/Contents/ PlugIns/IOUSBLib.bundle"}
| | | | | "idProduct" = 18256
| | | | | "bInterfaceClass" = 255
| | | | | "bAlternateSetting" = 0
| | | | | }
| | | | |
| | | | +-o IOUSBUserClientInit <class IOUSBUserClientInit>
| | | | {
| | | | "IOProviderMergeProperties" = {"IOCFPlugInTypes"={"2d9786c6-9ef3-11d4-ad51- 000a27052861"="IOUSBFamily.kext/Contents/PlugIns/ IOUSBLib.bundle"},"IOUserClientClass"="IOUSBInterfaceUserClient"}
| | | | "IOProviderClass" = "IOUSBInterface"
| | | | "IOMatchCategory" = "IOUSBUserClientInit"
| | | | "CFBundleIdentifier" = "com.apple.iokit.IOUSBUserClient"
| | | | "IOProbeScore" = 9000
| | | | "IOClass" = "IOUSBUserClientInit"
| | | | }
| | | |
| | | +-o IOUSBUserClientInit <class IOUSBUserClientInit>
| | | {
| | | "IOProviderMergeProperties" = {"IOCFPlugInTypes"={"9dc7b780-9ec0-11d4-a54f- 000a27052861"="IOUSBFamily.kext/Contents/PlugIns/ IOUSBLib.bundle"},"IOUserClientClass"="IOUSBDeviceUserClient"}
| | | "IOProviderClass" = "IOUSBDevice"
| | | "IOMatchCategory" = "IOUSBUserClientInit"
| | | "CFBundleIdentifier" = "com.apple.iokit.IOUSBUserClient"
| | | "IOProbeScore" = 9000
| | | "IOClass" = "IOUSBUserClientInit"
| | | }
| | |
| | +-o usb@1B,1 <class IOPCIDevice>
------------------------------------------------------------------------ --------------

Here's the Info.plist for the kext:
------------------------------------------------------------------------ --------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//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>CFBundleExecutable</key>
<string>modified</string>
<key>CFBundleIdentifier</key>
<string>com.line6.driver.guitarport</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundlePackageType</key>
<string>KEXT</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleVersion</key>
<string>1.0.0d1</string>
<key>IOKitPersonalities</key>
<dict>
<key>GuitarPort</key>
<dict>
<key>AudioEngines</key>
<array>
<dict>
<key>BlockSize</key>
<integer>512</integer>
<key>Description</key>
<string>GuitarPort Audio Engine #1</string>
<key>Formats</key>
<array>
<dict>
<key>IOAudioStreamAlignment</key>
<integer>1</integer>
<key>IOAudioStreamBitDepth</key>
<integer>16</integer>
<key>IOAudioStreamBitWidth</key>
<integer>16</integer>
<key>IOAudioStreamByteOrder</key>
<integer>0</integer>
<key>IOAudioStreamDriverTag</key>
<integer>0</integer>
<key>IOAudioStreamIsMixable</key>
<integer>1</integer>
<key>IOAudioStreamNumChannels</key>
<integer>2</integer>
<key>IOAudioStreamNumericRepresentation</key>
<integer>1936289396</integer>
<key>IOAudioStreamSampleFormat</key>
<string>1819304813</string>
</dict>
</array>
<key>NumBlocks</key>
<integer>32</integer>
<key>NumStreams</key>
<integer>1</integer>
<key>SampleRates</key>
<array>
<integer>44100</integer>
<integer>48000</integer>
</array>
</dict>
</array>
<key>CFBundleIdentifier</key>
<string>com.line6.driver.guitarport</string>
<key>IOClass</key>
<string>com_line6_L6KUsbIo</string>
<key>IOProviderClass</key>
<string>IOUSBDevice</string>
<key>bcdDevice</key>
<integer>1</integer>
<key>idProduct</key>
<integer>18256</integer>
<key>idVendor</key>
<integer>3649</integer>
</dict>
</dict>
<key>OSBundleLibraries</key>
<dict>
<key>com.apple.iokit.IOAudioFamily</key>
<string>1.1fc6</string>
<key>com.apple.iokit.IOUSBFamily</key>
<string>1.8</string>
</dict>
</dict>
</plist>

Thanks for taking the time to look into this. Don't be confused by the AppleUSBAudioEngine's presence in this driver, as I was trying to use it to get audio working. I have several directions I can go in to help the audio aspect, just haven't had the time yet to work on it.


Kris Daniel
Line 6, Inc.



On Thursday, October 2, 2003, at 09:19 AM, Fernando Urbina wrote:

On 10/2/03 9:38 AM, "Kris Daniel" <email@hidden> wrote:

Trying to open the interface a second time, it works successfully.
Now, if Classic isn't running, and no other code of mine is opening the
interface, what's going on?

You will still get an error in a kernel driver if somebody else, even from
userland, has the interface open.

Can you dump the registry when your driver fails (i.e. Without repeating
your interface->open() call):

% ioreg -l > filename.txt

And include the complete portion for your device in an email to the list.
Also, please dump the info plist for your driver:

% pl < /path/to/your/kext/Contents/Info.plist


--
Fernando Urbina mailto:email@hidden
USB Technology Team work: 719.534.9387
Apple Computer, Inc. fax: 719.532.0981
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References: 
 >Re: kIOReturnExclusiveAccess from USBInterfaceOpen() (From: Fernando Urbina <email@hidden>)



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