RE: clarity on kref needed.

[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@xxxxxxxxx]
> Sent: Thursday, January 19, 2006 11:03 AM
> To: Mukund JB.
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> 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@xxxxxxxxx]
> > > Sent: Thursday, January 19, 2006 10:33 AM
> > > To: Mukund JB.
> > > Cc: linux-kernel@xxxxxxxxxxxxxxx
> > > 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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