The w1 kernel module is used by owfs like a physical bus master. The match
is not exact, so the workarounds are interesting.
1. w1 grabs all the bus masters it supports. They get no particular order,
and if disconnected, the bus master is re-announced with a new location.
2. Communication is via the netlink interface. Only root can read messages,
and all 1-wire data and communication (synchronous and asynchronous are sent
on the same channel.
3. The intent of w1 was system monitoring, so temperature is the main focus.
Certain chips are individually supported, we got generic codes added for raw
access.
4. Linklocator and DS2409 microhubs are not supported.
5. There is some intrinsic polling of the sensors that can interfere.
------
We added dynamically allocated bus masters, a main netlink interface thread
and then distribution via unix pipes to the correct thread. The polling,
timeouts and coordination is a little tricky and so that's why more testing
is needed.
Paul Alfille
On Wed, Dec 2, 2009 at 4:24 PM, Wolfgang Grandegger <w...@grandegger.com>wrote:
> Hi Paul,
>
> Paul Alfille wrote:
> > Although the structure for w1 support is in owfs, the modified kernel
> module
> > wasn't in place until 2.6.30 and so hasn't been tested.
> >
> > What kernel version are you using?
>
> I'm using 2.6.32-rc6. I already spotted one problem/bug in OWFS, which
> brought me a bit further with the "owfs" program. Will send a patch
> tomorrow. "owserver" works a bit better:
>
> bash-3.2# ./owdir
> /01.1B5F6B130000
> /43.BD5711000000
> /43.6B4011000000
> /bus.0
> /uncached
> /settings
> /system
> /statistics
> /structure
> -bash-3.2# ./owdir /43.BD5711000000
> /43.BD5711000000/address
> /43.BD5711000000/alias
> /43.BD5711000000/crc8
> /43.BD5711000000/family
> /43.BD5711000000/id
> /43.BD5711000000/locator
> /43.BD5711000000/memory
> /43.BD5711000000/pages
> /43.BD5711000000/present
> /43.BD5711000000/r_address
> /43.BD5711000000/r_id
> /43.BD5711000000/r_locator
> /43.BD5711000000/type
>
> But still a few accesses fail:
>
> -bash-3.2# ./owread /43.BD5711000000/pages/page.0
> ServerRead: Data error on /43.BD5711000000/pages/page.0
>
> Wolfgang.
>
>
> > On Wed, Dec 2, 2009 at 9:44 AM, Wolfgang Grandegger <w...@grandegger.com
> >wrote:
> >
> >> Hallo,
> >>
> >> I'm trying to get OWFS running over the W1 netlink interface to a MXC
> >> 1-wire bus-master on a ARM i.mx31 based board. The W1 of the kernel
> >> works fine and I can see the 1-wire devices:
> >>
> >> -bash-3.2# ls /sys/bus/w1/devices
> >> 01-0000136b5f1b 43-00000011406b 43-0000001157bd w1_bus_master1
> >>
> >> Unfortunately, I do not get OWFS to work:
> >>
> >> -bash-3.2# owfs --w1 /mnt/1-wire
> >> -bash-3.2# insmod mxc_w1.ko
> >> -bash-3.2# cd /mnt/1-wire
> >> -bash-3.2# ls
> >> settings statistics structure system uncached
> >>
> >> owfs seems not so scan for slave devices. I even need to load the 1-wire
> >> bus-master driver after starting owfs, otherwise it will not realize the
> >> bus masters properly. Are there any known issue?
> >>
> >> Thanks for help.
> >>
> >> Wolfgang.
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >> Join us December 9, 2009 for the Red Hat Virtual Experience,
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> >> https://lists.sourceforge.net/lists/listinfo/owfs-developers
> >>
> >
> >
> > ------------------------------------------------------------------------
> >
> >
> ------------------------------------------------------------------------------
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> >
> >
> > ------------------------------------------------------------------------
> >
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>
>
>
> ------------------------------------------------------------------------------
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> a free event focused on virtualization and cloud computing.
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>
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