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

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Message-ID: <20100205171659.GF14145@suse.de>
Date:	Fri, 5 Feb 2010 09:16:59 -0800
From:	Greg KH <gregkh@...e.de>
To:	Chris Verges <chrisv@...erswitching.com>
Cc:	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, Feb 04, 2010 at 08:47:05PM -0800, 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.
> 
> An additional "raw" sysfs entry has been added to aid in debugging.  If
> used, an "echo" will send the data specified in the string to the USB
> device, and print back the results.  It is not recommended for customer
> use except by expert users.

Is a kernel driver really needed for this device?  You could do this all
in userspace with libusb/usbfs and not need a driver, right?

That's what we do for other USB thermometers today.

thanks,

greg k-h
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