On Thu, 2 Jul 2009, Giacomo Lozito wrote: > >The point of my question is: How does Windows know there are four LUNs? > > I'd like to understand that, too. > > Googling around I discovered a "Realtek RTS5101/RTS5111/RTS5116 Card Reader > driver" for windows containing a rtusbstor.inf that covers my model > (0bda:0152) and others from the same family. > However, in my setup of windows vista the device is handled by usbstor.sys > (and works correctly) and there's no rtusbstor.sys, so I'd assume that the > standard usbstor.sys already includes the support required for these devices. > > I'll gladly provide more information, if you can tell me where to look. Try running SnoopyPro to capture the communication between Windows and the device. > I also noticed that my model is a composite device (on windows, it uses MI_00 > for the card reader and MI_01 for a hid). > This can be seen in linux as well, in my /proc/bus/usb/devices . > > Looking at the first post in this thread > http://ubuntu-virginia.ubuntuforums.org/showthread.php?p=7452052 > it can be seen that the model 0bda:0151 correctly detects all of the four > slots without my patch. > > From the rtusbstor.inf I discovered that 0bda:0152 (my model, which really > deserves the "unusual" adjective) is the only card reader model among those > which is also a composite usb device. > This might be a clue to understand why it doesn't work out of the box like the > others. > > Just wondering... could be that GetMaxLun is failing due to the fact that this > is a composite device where one interface is multi-lun and the other is not? > (yes, I've seen that the multi-lun check is made separatedly for each > interface, so I'd blame the device) All I can say is that t's failing because of a bug in the device. But the exact nature of that bug is impossible to determine. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
