I had this conversation from the designer of ds9490r forewarded to me (and
permission to post):
On Wed, 12 Jan 2005 18:24:58 -0000
"MANSION, James" <[EMAIL PROTECTED]> wrote:
> Evgeniy,
>
> Silly question but - is there a document (or example of) on how to
> actually access the devices that the kernel detects from a user
> application?
w1 core creates unified set of files in /sys (sysfs) directory,
reading(writing is coming) from those files is transferred into
w1 commands, which are sent over the wire.
> Any particular advantage to this rather than libusb?
If and only if you want to use usb <-> w1 connection, then there are no
advantages at all, but if you want to use extend your setup later, for
example add lpt/rs232 <-> w1 bus master or GPIO based or any other,
then it is better to use unified interface to w1 core(and thus do not change
upper layer applications), which is provided by kernel's implementation. In
some cases(GPIO, iPaq w1 master) it is the only solution to use kernel
drivers.
> Am I right to think that once Linux detects the devices with a
> suitable kernel, then I *have* to use the built in device and can't
> attach raw from libusb?
As far as I remember,
you can not use both kernel ds2490 driver and libusb one in parallel.
> Cheers
> James
Evgeniy Polyakov
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