[RFC/PATCH 0/22] W1: sysfs, lifetime and other fixes

Dmitry Torokhov dmitry.torokhov at gmail.com
Mon Apr 25 18:36:05 CEST 2005


On 4/25/05, Evgeniy Polyakov <johnpol at 2ka.mipt.ru> wrote:
> On Thu, 2005-04-21 at 11:09 -0500, Dmitry Torokhov wrote:
> > One more thing...
> >
> > On 4/21/05, Evgeniy Polyakov <johnpol at 2ka.mipt.ru> wrote:
> > > On Thu, 2005-04-21 at 02:07 -0500, Dmitry Torokhov wrote:
> > >
> > > > w1-master-drop-attrs.patch
> > > >    Get rid of unneeded master device attributes:
> > > >    - 'pointer' and 'attempts' are meaningless for userspace;
> > > >    - information provided by 'slaves' and 'slave_count' can be gathered
> > > >      from other sysfs bits;
> > > >    - w1_slave_found has to be rearranged now that slave_count field is gone.
> > >
> > > attempts is usefull for broken lines.
> >
> > It simply increments with every search i.e. every 10 secondsby default
> > and does not provide indication of the quality of the wire.
> 
> When slaves can not be found until several attempts, it means line
> is broken, how many time existing slave appeared/dissapeared during
> /sys/bus/w1/devices/w1_master1/attempts says about link quality.

Heh, if you are debugging all you need is "date" command to see how
quickly slave appears. If you want to keep statistics your program
need to listen to hotpug events for master and slaves and count these.
I do not see a reason for a counter that simply increments every 10
seconds.

-- 
Dmitry



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