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

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Message-ID: <20120613005835.GA6665@kroah.com>
Date:	Tue, 12 Jun 2012 17:58:35 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	stefani@...bold.net
Cc:	linux-kernel@...r.kernel.org, oneukum@...e.de,
	alan@...rguk.ukuu.org.uk, thomas.braunstorfinger@...de-schwarz.com
Subject: Re: [PATCH] add new NRP power meter USB device driver

On Sun, Jun 03, 2012 at 10:46:12AM +0200, stefani@...bold.net wrote:
> From: Stefani Seibold <stefani@...bold.net>
> 
> This driver supports all of the Rohde&Schwarz RF Power Meter NRP Sensors. These
> sensors are intelligent standalone instruments that communicate via USB.
> 
> A power meter is a device for analyzing the RF power output level of an
> electrical device, similar to an oscilloscope.
> 
> The Power Meter Sensors will be used in a wide range of environements, like
> 
> - Manufacturing (e.g. air planes and smart phones)
> - Radio and TV broadcasting
> - Mobile communications
> - Engeeniering
> - Science Labs
> - Education
> 
> The NRP Power Meters support the following measurements:
> 
>  - Dynamic range: up to 90 dB (sensor dependent)
>  - Level range: -67 dBm to +45 dBm (sensor dependent)
>  - Frequency range: DC to 67 GHz (sensor dependent)
>  - Measurement speed: 1500 measurements per second in the buffered mode
>  - Linearity uncertainty: 0.007 dB
>  - Precise average power measurements irrespective of modulation and bandwidth
>  - Flexible measurements on up to 128 time slots per power sensor
>  - S parameter correction of components between sensor and test object
> 
> The device will be controlled by a SCPI like interface.
> (https://en.wikipedia.org/wiki/Standard_Commands_for_Programmable_Instruments)

I still don't see any performance numbers stating why this needs to be a
kernel driver...

Also, what happened to the IIO interface for this instead of a custom
syscall/ioctl for just this device type?

thanks,

greg k-h
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