On Wed, 3 May 2006, Pete Zaitcev wrote: > On Tue, 2 May 2006 10:31:14 -0700, Matthew Dharm <[EMAIL PROTECTED]> wrote: > > > > > So what criteria did you use to decide whether to set it to > > > > USB_US_TYPE_STOR or "0"? I'm assuming 0 means usb-storage? > > > > > > No, zero means "runtime-selectable". The ub only works with 8/6/50 > > > devices, so this disqualifies anything that > > > - uses 8070, 8020, RBC, etc. > > > - uses UFI, even over bulk > > > - uses CB or CBI for transport > > > - needs any initialization function > > > > > > Also, a bunch of devices use unknown protocols, because they only > > > have SC_DEVICE and PR_DEVICE listed. > > > > > > So, in the end almost everything has to be locked to usb-storage. > > > > My only objection is that the above bit of knowledge should be spelled out > > somewhere very clearly in ub, libusual, and usb-storage so that people > > wondering the same thing can find it no matter where they look. > > This is very valid, although the list of exceptions which I listed > above muddies the waters. > > The simplest way to look at it is to consider the case of libusual > absent. Then, the list of devices which ub supports is given with one > line which matches 8/6/50. > > When we are armed with libusual, we can make the safe set more precise > by including devices which mistakenly specify 0xff somewhere and > by excluding that non-disk, pure SCSI adapter by Adaptec. > > So, the comment would not be too long, and it does not need to list > exceptions as I did for illustrative purposes. Still, I'm having > difficulties formulating it. I have to think about it a bit more. > > You and Alan seem not to have any difficulty figuring it out > from just the code, so I hoped to let it slide :-)
This could be done programmatically. The major barrier is the need to handle entries with SC_DEVICE or PR_DEVICE, and that could be done by adding a couple of extra flag bits to the libusual table. (The libusual probe routine would then have to check the actual descriptor values.) However this would tie libusual even more closely to ub/usb-storage than it is now, and it would be somewhat ugly. Alan Stern ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
