linux-kernel - Re: [PATCH] add new NRP power meter USB device driver

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Message-Id: <201205311432.40695.oneukum@suse.de>
Date:	Thu, 31 May 2012 14:32:40 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Stefani Seibold <stefani@...bold.net>,
	linux-kernel@...r.kernel.org,
	thomas.braunstorfinger@...de-schwarz.com
Subject: Re: [PATCH] add new NRP power meter USB device driver

 Am Donnerstag, 31. Mai 2012, 14:04:11 schrieben Sie:
> On Thu, May 31, 2012 at 12:17:11PM +0200, Oliver Neukum wrote:
> > Am Donnerstag, 31. Mai 2012, 11:53:04 schrieb Greg KH:
> > > > So it is a chicken and egg problem. A lot of software is now out with
> > > > depends on this driver and a lot of embedded development environments
> > > > doesn't provide libudev, libsysfs und libusb. It will also increase the
> > > > size of the image and adds additional dependencies to the application.
> > > 
> > > You don't need any of those libraries to do this.  What's wrong with
> > > using "raw" usbfs interactions?
> > 
> > SPI is not limited to USB. If we can get a unified subsystem then the
> > drivers need to be in kernel space, as some hardware does not allow
> > a solution in user space.
> 
> Ok, now that is a valid reason for a kernel driver.
> 
> But, I think it should use the IIO interface, as that should handle
> these types of devices.

Bad gamble for the future. We will end up with an interface which
would not be implementable.

	Regards
		Oliver
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