[Linux-usb-users] Sony CRXP-90MU and THAT dratted Memory Stick slot (USB 2.0 ATA /ATAPI controller)

[Chris Rankin]

Hi,

I have a Sony CRXP-90MU USB 2.0 CDRW/DVD-ROM drive with a built-in Memory Stick slot. The CD component seems to work OK, although Linux 2.4.20 never locates the Memory Stick device. (I have posted about this before...)

I have made some progress in this matter since my last post. Today, I finally laid my hands on a Win2000 laptop and saw what the device *should* look like to the operating system. Apparently, the (Vendor, Product) pair (0x54c, 0xa7) actually refers to the USB 2.0 ATA/ATAPI controller device itself. This controller then supports two ATAPI devices: the CD burner at LUN 0 and the Memory Stick at LUN 1. Without explicit support for this controller device, the only thing that Linux finds is the CD device at LUN 0, and I'm guessing that I'm lucky that it finds even that.

I have absolutely no idea what the underlying hardware for this ATA controller device is, and I am *hoping* that Sony *bought* rather than designed a chipset to build it because they have proved singularly unhelpful. Such "off the shelf" controllers do seem to exist, e.g. SMSC sell such a beast:

http://www.smsc.com/main/datasheet.html

specifically the 97c201 and 97c202. Texas Instruments also seem to have something called the TUSB6250, which looks similar.

I don't suppose that anyone out there happens to be experimenting with a driver for either of these chipsets, please? No, I haven't taken my CRXP-90MU apart yet and looked inside. I also have no idea where to even begin writing a driver of my own: even just a chipset-detection routine. Could anyone out there help me with that much, please?

Cheers,
Chris



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