SCSIPeripheralsDriverKit/IOUserSCSIPeripheralDeviceType00 Error:kIOReturnUnsupported (0xe00002c7)

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Created Apr ’24

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I am using SCSIPeripheralsDriverKit/IOUserSCSIPeripheralDeviceType00 to develop a Dext driver, which has only two classes: MyUserSCSIPeripheralDeviceType00 and MyUserClient, MyUserClient is responsible for receiving APP commands and passing them to MyUserSCSIPeripheralDeviceType00->UserSendCDB(), After the device is connected to the computer, the driver can match the device and start, calling MyUserSCSIPeripheralDeviceType00-->init(), MyUserSCSIPeripheralDeviceType00-->Start(), Any command sent by the APP to MyUserSCSIPeripheralDeviceType00 will return a failure: kIOReturnUnsupported (0xe00002c7), including UserSendCDB(), UserReportMediumBlockSize(),

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>IOKitPersonalities</key>
	<dict>
		<key>MySCSIDriver</key>
		<dict>
			<key>CFBundleIdentifier</key>
			<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
			<key>CFBundleIdentifierKernel</key>
			<string>com.apple.kpi.iokit</string>
			<key>IOClass</key>
			<string>IOUserService</string>
			<key>IOMatchCategory</key>
			<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
			<key>IOProviderClass</key>
			<string>IOSCSIPeripheralDeviceNub</string>
			<key>IOResourceMatch</key>
			<string>IOKit</string>
			<key>IOUserClass</key>
			<string>MyUserSCSIPeripheralDeviceType00</string>
			<key>IOUserServerName</key>
			<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
			<key>UserClientProperties</key>
			<dict>
				<key>IOClass</key>
				<string>IOUserUserClient</string>
				<key>IOUserClass</key>
				<string>MyUserClient</string>
			</dict>
			<key>bConfigurationValue</key>
			<integer>1</integer>
			<key>bInterfaceNumber</key>
			<integer>0</integer>
			<key>bcdDevice</key>
			<integer>1</integer>
			<key>idProduct</key>
			<string>*</string>
			<key>idVendor</key>
			<integer>12345</integer>
			<key>Peripheral Device Type</key>
			<integer>0</integer>
			<key>IOKitDebug</key>
			<integer>65535</integer>
		</dict>
	</dict>
</dict>
</plist>

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This is the method that receives client calls

kern_return_t MyUserSCSIPeripheralDeviceType00::HandleExternalStruct(IOUserClientMethodArguments* arguments)
{
    kern_return_t ret = kIOReturnSuccess;
    SCSIType00OutParameters command;
    SCSIType00InParameters response;
    SCSI_Sense_Data sense;
    UInt64 fSenseAddr = (intptr_t)&sense;

    bzero((void *)&command, sizeof(SCSIType00OutParameters));
    bzero((void *)&response, sizeof(SCSIType00InParameters));

    bool test = TEST_UNIT_READY(&command, &response, fSenseAddr);
    // test is true

    ret = this->UserSendCDB(command, &response);
    // ret is kIOReturnUnsupported （0xe00002c7）

    UInt64 blockSize;
    kern_return_t sizeRet = this->UserReportMediumBlockSize(&blockSize);
    // sizeRet is kIOReturnUnsupported （0xe00002c7）
};

// Not called. As per the documentation, this should be called during enumeration. 
kern_return_t IMPL(I4UserSCSIPeripheralDeviceType00, UserDetermineDeviceCharacteristics)
{
   //
    *result = true;
    return kIOReturnSuccess;
}

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