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SubjectRE: clarity on kref needed.
DateThu, 19 Jan 2006 12:30:40 +0530
From"Mukund JB." <>
Can you give me some pointers & documentation links for HOWTO using libusb/usbfs instead of a kernel driver.

Regards,
Mukund Jampala

> -----Original Message-----> From: Greg KH [mailto:greg@kroah.com]> Sent: Thursday, January 19, 2006 11:03 AM> To: Mukund JB.> Cc: linux-kernel@vger.kernel.org> Subject: Re: clarity on kref needed.> > > On Thu, Jan 19, 2006 at 10:35:37AM +0530, Mukund JB. wrote:
> > > > > > > -----Original Message-----> > > From: Greg KH [mailto:greg@kroah.com]> > > Sent: Thursday, January 19, 2006 10:33 AM> > > To: Mukund JB.> > > Cc: linux-kernel@vger.kernel.org> > > Subject: Re: clarity on kref needed.> > > > > > > > > On Thu, Jan 19, 2006 at 10:15:51AM +0530, Mukund JB. wrote:
> > > > > > > > > > I have gone through kref and am planning to implement then > > > > > in my usb driver.> > > > > > > > > > What kind of usb driver?> > > > It is a finger print authentication USB driver. it > doesn ot do the> > > > authgentication but transports data to the application > which really> > > > does some processing.> > > > > > You shouldn't need a kernel driver for this, it can be done 
> > > in userspace> > > with libusb/usbfs, right?> > > > I mean I will register a char driver. I will just write a > simple char> > kernel module to read data from the USB device and zero > copy it to the> > userspace application. I guess that is the minimum work we > need to do.> > You can do that from userspace with libusb/usbfs with no kernel driver
> needed.  Why not do that instead?> > > Is there any other way using libusb/usbfs in which we can do this
> > without a need of USB kernel driver?> > Yes, use libusb/usbfs :)> > > > > No, I did not find any Documentation/kref.txt.> > > > But I have read about kred in the link below:> > > > > > > http://developer.osdl.org/dev/robustmutexes/src/fusyn.hg/Docum> > entation/kref.txt> > > >> > > >Is kref depricated because I find nothing related to it > in linux/Documentation/?> > > > > What kernel version are you looking at?  Look in the > kernel source tree> > > from kernel.org.  What kernel tree are you building your > driver against.> > > > I am planning it for 2.6.11.12.> > That's a pretty old kernel version, why not use the latest version?
> > thanks,> > greg k-h> 
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