Hi Greg , Thanx for the reply . So what i have understood is this : 1) On host , userspace program will receive usb connect / disconnect events via udev . by this time device is connected in usb mass storage configuration . 2) upon receive usb connect , to select 2nd configuration program shud do echo 2 > /sys/bus/usb/devices/.../bConfigurationValue to the device . now here is some glitch , when we do disconnect like this , usb device also shows "disconnect display" before setting to 2nd configuration as commanded by host , which looks odd , as while user has connected his device device will display disconnected notification for a while . How this situation can be handled ? Regards Amit Nagal On Fri, Jun 11, 2010 at 9:56 AM, Greg KH <greg@xxxxxxxxx> wrote: > On Fri, Jun 11, 2010 at 09:16:21AM +0530, Amit Nagal wrote: >> HI Alen , >> >> Thanx for the reply . it will certainly help my cause . >> >> But my problem is , before a userspace program send the command >> >> echo N >/sys/bus/usb/devices/.../bConfigurationValue to the device , >> >> usb host will already select default mass storage configuration on >> device plugin >> >> (device exposes default 1st configuration as mass storage and we have >> no control over device firmware ). >> >> this is not desired . what i want is , usb host on detecting this >> multi configuration device , >> >> instead of selecting default configuration , invoke some userspace binary >> >> where depending upon "echo N >> >/sys/bus/usb/devices/.../bConfigurationValue to the device " >> >> desired configuration can be selected . >> >> so how i can handle this signalling from usb host to userspace . > > Userspace is notified, just do the disconnect from a program that gets > the udev event when the device is found. > > It's no problem to disconnect from the usb-storage device. > > thanks, > > greg k-h > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
