Re: Recognize USB devices by user-application
Greg KH <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Fri, Jul 06, 2007 at 10:09:39AM -0300, Ana Ravena Alcantara da Costa wrote: > Hello! > I am working with a kernel 2.4.25 embedded in a processor mpc5xxx from > Freescale. > I'm trying to make USB work at this kernel, but some details are still a > litle obscure to me. > All USB drivers are working well and I have enabled devfs for my devices > be mounted at /dev/usb automatically. > Therefore I don't know how user-application can know that a device had > been connected or disconnected on USB bus. Listen to the hotplug events sent to /sbin/hotplug, or watch the /proc/bus/usb/devices file for changes. Unfortunatly, 2.4 does not do this very well, the 2.6 kernel handles this much better. > Other problem is umount USB devices when they were disconnected. An > example: I disconnected my USB-serial converter but still there is > /dev/usb/tty/0 at my tree. Does userspace still have the device open? There was a reason we removed devfs from the 2.6 kernel tree :) good luck, greg k-h ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel