linux-kernel - Re: [PATCH] linux-2.6.32-directemp

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Date:	Fri, 5 Feb 2010 10:45:29 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Chris Verges <chrisv@...erswitching.com>
cc:	Greg Kroah-Hartman <gregkh@...e.de>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Rob Owings <rowings@...rmistor.com>
Subject: Re: [PATCH] linux-2.6.32-directemp

On Thu, 4 Feb 2010, Chris Verges wrote:

> Hi Linux gurus,
> 
> Attached is a patch for the QTI DirecTEMP USB thermometer &
> thermometer/hygrometer sensors.  This patch is based on linux-2.6.32.
> Functionality has been verified against both hardware variants listed in
> the driver (0x0002 and 0x0006), as both monolithic and modular.
> 
> When the QTI DirecTEMP sensor is connected to a system, the directemp
> driver adds appropriate sysfs entries for the sensor type(s) supported.
> Examples:
> 
>    # PID 0x0002 (temp only)
>    /sys/bus/usb/devices/.../temp
> 
>    # PID 0x0006 (temp + relative humidity)
>    /sys/bus/usb/devices/.../temp
>    /sys/bus/usb/devices/.../rh
> 
> Using a standard "cat" will display the value.

This isn't a big deal... but it's more common for drivers to provide
regular device files for I/O than to rely on sysfs attributes.  You end 
up with more control and flexibility.

Alan Stern

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