Re: number of /dev/usb nodes
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Bernd Walter wrote: > On Sun, Jun 08, 2008 at 10:16:26AM -0400, Chuck Robey wrote: >> -BEGIN PGP SIGNED MESSAGE- >> Hash: SHA1 >> >> Bernd Walter wrote: >>> On Sat, Jun 07, 2008 at 01:18:41PM -0400, Chuck Robey wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 I can't seem to find how many /dev/usbN bus devices there can be. I'm writing some code that scans them all looking for anything that has my device, but I while I know to start at usb0, just how high do I go? There seem to be 128 device minors, is that the number? (from dev/usb/usb.h) >>> There shouldn't be a limit anymore. >>> I can't see any definition of 128 in usb.h that limits the number of >>> busses. >>> The major/minor differenciation is long time ago. >>> You must be looking at old code. >>> >> I was trying to find a good way to do scanning, whjen I create the files like >> /dev/usb0, how far to go in my loop? Does the lowest available device always >> get created? That would imply that as soon as I began to get "No such >> device" >> errors, I could stop iterating. If the rules for picking device filenames >> are >> pretty loose, then I could (for instance) stop scanning, say, 4 numbers past >> the >> first "No such device" returnee. > > This wouldn't work if a USB controller is remove - e.g. a pulling a > cardbus card. > >> Any idea on this? I didn't see this i nthe code, but I just need some sane >> limit on what filenames to scan about in. I look for item info, and if the >> usb >> vendor and prodict look friendly, I just snag the filename involved, and use >> that. Like, a scan of the usb1 bus might yield me a uhid0 which might be my >> meat, whereupon I coulld drop the usb1 open, and replace it with a uhid0 >> open. >> There's more than 1 place that my devices could show, depending on the user's >> kernel devices. I just want to have some sane limit on how many usb buses I >> open for my scanning. > > I never had to deal with this, since writing a USB driver is simple and > as a driver you get informed for each new device. > No need to scan the busses yourself. > But I would say that the most reliable way is to just scan /dev/ for > usb... > Assumptions I never said I was writing a FreeBSD driver... I am writing what Xorg calls an input driver (Xinput). I could rely on the config file, I thought I would try to use a scan in case I can't find the dev the user passes me. I see no reason to write a FreeBSD driver when I can do everything I need within the uhid driver (at least so far, in my test prog). There IS one caveat: I've posted to the FreeBSD-USB list that there is a part of the libusbhid that I can't yet get working. Writing a FreeBSD driver would allow me to use other available data marshalling code, like what's in the ums driver. If I can't interest anyone to comment about the libusbhid, I might be forced down that path, but I don't want to. -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.4 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFITA5rz62J6PPcoOkRArTGAJ938MKH9L1HRuIpaH3QCy38huJwkQCfUCeF dE0dyEG+GZUMhi8fAIXNfRk= =ddvg -END PGP SIGNATURE- ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: number of /dev/usb nodes
On Sun, Jun 08, 2008 at 10:16:26AM -0400, Chuck Robey wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Bernd Walter wrote: > > On Sat, Jun 07, 2008 at 01:18:41PM -0400, Chuck Robey wrote: > >> -BEGIN PGP SIGNED MESSAGE- > >> Hash: SHA1 > >> > >> I can't seem to find how many /dev/usbN bus devices there can be. I'm > >> writing > >> some code that scans them all looking for anything that has my device, but > >> I > >> while I know to start at usb0, just how high do I go? There seem to be 128 > >> device minors, is that the number? (from dev/usb/usb.h) > > > > There shouldn't be a limit anymore. > > I can't see any definition of 128 in usb.h that limits the number of > > busses. > > The major/minor differenciation is long time ago. > > You must be looking at old code. > > > > I was trying to find a good way to do scanning, whjen I create the files like > /dev/usb0, how far to go in my loop? Does the lowest available device always > get created? That would imply that as soon as I began to get "No such device" > errors, I could stop iterating. If the rules for picking device filenames are > pretty loose, then I could (for instance) stop scanning, say, 4 numbers past > the > first "No such device" returnee. This wouldn't work if a USB controller is remove - e.g. a pulling a cardbus card. > Any idea on this? I didn't see this i nthe code, but I just need some sane > limit on what filenames to scan about in. I look for item info, and if the > usb > vendor and prodict look friendly, I just snag the filename involved, and use > that. Like, a scan of the usb1 bus might yield me a uhid0 which might be my > meat, whereupon I coulld drop the usb1 open, and replace it with a uhid0 open. > There's more than 1 place that my devices could show, depending on the user's > kernel devices. I just want to have some sane limit on how many usb buses I > open for my scanning. I never had to deal with this, since writing a USB driver is simple and as a driver you get informed for each new device. No need to scan the busses yourself. But I would say that the most reliable way is to just scan /dev/ for usb... -- B.Walter <[EMAIL PROTECTED]> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: number of /dev/usb nodes
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Bernd Walter wrote: > On Sat, Jun 07, 2008 at 01:18:41PM -0400, Chuck Robey wrote: >> -BEGIN PGP SIGNED MESSAGE- >> Hash: SHA1 >> >> I can't seem to find how many /dev/usbN bus devices there can be. I'm >> writing >> some code that scans them all looking for anything that has my device, but I >> while I know to start at usb0, just how high do I go? There seem to be 128 >> device minors, is that the number? (from dev/usb/usb.h) > > There shouldn't be a limit anymore. > I can't see any definition of 128 in usb.h that limits the number of > busses. > The major/minor differenciation is long time ago. > You must be looking at old code. > I was trying to find a good way to do scanning, whjen I create the files like /dev/usb0, how far to go in my loop? Does the lowest available device always get created? That would imply that as soon as I began to get "No such device" errors, I could stop iterating. If the rules for picking device filenames are pretty loose, then I could (for instance) stop scanning, say, 4 numbers past the first "No such device" returnee. Any idea on this? I didn't see this i nthe code, but I just need some sane limit on what filenames to scan about in. I look for item info, and if the usb vendor and prodict look friendly, I just snag the filename involved, and use that. Like, a scan of the usb1 bus might yield me a uhid0 which might be my meat, whereupon I coulld drop the usb1 open, and replace it with a uhid0 open. There's more than 1 place that my devices could show, depending on the user's kernel devices. I just want to have some sane limit on how many usb buses I open for my scanning. -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.4 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFIS+m6z62J6PPcoOkRAgBoAJ0XYYfUat/fJDChSybpNtFzCwUr9ACdGxNf UoCeHzvriXfQ+bj5LDxE8vA= =sTcT -END PGP SIGNATURE- ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: number of /dev/usb nodes
On Sat, Jun 07, 2008 at 01:18:41PM -0400, Chuck Robey wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > I can't seem to find how many /dev/usbN bus devices there can be. I'm writing > some code that scans them all looking for anything that has my device, but I > while I know to start at usb0, just how high do I go? There seem to be 128 > device minors, is that the number? (from dev/usb/usb.h) There shouldn't be a limit anymore. I can't see any definition of 128 in usb.h that limits the number of busses. The major/minor differenciation is long time ago. You must be looking at old code. -- B.Walter <[EMAIL PROTECTED]> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
number of /dev/usb nodes
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 I can't seem to find how many /dev/usbN bus devices there can be. I'm writing some code that scans them all looking for anything that has my device, but I while I know to start at usb0, just how high do I go? There seem to be 128 device minors, is that the number? (from dev/usb/usb.h) -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.4 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFISsLxz62J6PPcoOkRAtSTAKCFC8NueSSuJ0yZcVNwdjQie3SZJgCfb0bL AMAwFSbFBySoSVCfqc7R0+M= =MwIo -END PGP SIGNATURE- ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
