On Fri, 26 Jan 2007, Oleg Verych wrote: > 25-01-2007, Oleg Verych: > [] > > (shame on me, but i only have read USB-in-a- nutshell.pdf [by Copyright > > 2002, Craig Peacock <[EMAIL PROTECTED]> Third Release] back > > in summer and adopted request_firmare() to one usb-serial driver). > [] > > That doc., i have mensioned, pages 19-20 describes _interfaces_ in > > particular, as posibility to have fax/scanner/printer device. > > And configurations there described as a way to have different power > modes.
That is an oversimplification. Configurations can be used as a way to have different power modes, but they can be used for many other things as well. For example, a device will have different configurations when running at high speed and when running at full speed. > If i will assume, that anonymous default conf. #1 in TI USB's > serial firmware is for "switch all interfaced devices to power-off mode", > it's pretty much OK with the theory. Say, it was a universal firmware > template and system programmer just didn't remove anything, even this > conf. may have nothing at all with power modes of interfaced hardware, > but still it's default, and must be changed by USB host. > > And if i will go further, assuming, that TI MSP430 uC *are* the lowest > power, as climbed by TI, i think they have done exactly as that. > > Again i still don't know, how other devices are dealing with this. Other devices don't use configurations for selecting different power modes. They use a different technique, or they have only one operational power level. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
