On 2004.11.25, Greg KH wrote:
> > On 2004.11.22, Andrew Morton wrote:
> > >
> > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.10-rc2/2.6.10-rc2-mm3/
> > >
> >
> > Problem with /sys/bus/i2c/devices empty.
> >
> > I am running a 2.10-rc2-mm3 kernel with a couple pathes (unrelated to
> > i2c). It shows me an empty directory in /sys/bus/i2c/devices, even
> > if I have all suitable modules loaded:
>
> Are you sure these are the proper modules for this system?
>

The same /etc/sysconfig/lm_sensors has been working for many 2.6 kernels ;)

> > Module Size Used by
> > w83627hf 24224 0
> > i2c_dev 8192 0
> > i2c_sensor 3328 1 w83627hf
> > i2c_isa 2304 0
> > i2c_i801 7692 0
> > i2c_core 18560 5 w83627hf,i2c_dev,i2c_sensor,i2c_isa,i2c_i801
> >
> > On boxes running 2.6.9, the devices are present with the same module list
> > (different adapters)
>
> Ah, but what about 2.6.9 on this same machine? Are you sure that the

See below. I booted again on 2.6.9-jam1 (mm1 with fixes collected from LKML).

> i2c_i801 driver is the proper one for this box? How about the w83627hf
> driver? Are you sure that chip is on it?
>

I updated my sensors userspace to latest cvs to check if some kind of
de-synchronisation was the cause:

werewolf:~> sensors -v
sensors version 2.9.0-CVS with libsensors version 2.9.0-CVS

sensors-detect on 2.6.9-mm1:

Now follows a summary of the probes I have just done.
Just press ENTER to continue:

Driver `to-be-written' (should be inserted):
Detects correctly:
* Bus `SMBus I801 adapter at 0500' (Algorithm unavailable)
Busdriver `i2c-i801', I2C address 0x2f (and 0x48 0x49)
Chip `Winbond W83792D' (confidence: 8)

Driver `smbus-arp' (should be inserted):
Detects correctly:
* Bus `SMBus I801 adapter at 0500' (Algorithm unavailable)
Busdriver `i2c-i801', I2C address 0x61
Chip `SMBus 2.0 ARP-Capable Device' (confidence: 1)

Driver `it87' (may not be inserted):
Misdetects:
* ISA bus address 0x0290 (Busdriver `i2c-isa')
Chip `ITE IT8705F / IT8712F / SiS 950' (confidence: 8)

Driver `w83627hf' (should be inserted):
Detects correctly:
* ISA bus address 0x0290 (Busdriver `i2c-isa')
Chip `Winbond W83627THF Super IO Sensors' (confidence: 9)

To make the sensors modules behave correctly, add these lines to
/etc/modules.conf:

#----cut here----
# I2C module options
alias char-major-89 i2c-dev
#----cut here----

To load everything that is needed, add this to some /etc/rc* file:

#----cut here----
# I2C adapter drivers
modprobe i2c-i801
modprobe i2c-isa
# I2C chip drivers
# no driver for Winbond W83792D yet
modprobe smbus-arp
modprobe w83627hf
# sleep 2 # optional
/usr/local/bin/sensors -s # recommended
#----cut here----

With this modules (no smbus-arp):
w83627hf 25128 0
eeprom 7072 0
i2c_sensor 3456 2 w83627hf,eeprom
i2c_isa 2304 0
i2c_i801 7820 0
i2c_core 19712 5 w83627hf,eeprom,i2c_sensor,i2c_isa,i2c_i801

I can see this:

werewolf:~> ls /sys/bus/i2c/devices
0-0050@ 0-0052@ 1-0290@

Now, 2.6.10-rc2-mm3:

Driver `to-be-written' (should be inserted):
Detects correctly:
* Bus `SMBus I801 adapter at 0500' (Algorithm unavailable)
Busdriver `i2c-i801', I2C address 0x2f (and 0x48 0x49)
Chip `Winbond W83792D' (confidence: 8)

Driver `smbus-arp' (should be inserted):
Detects correctly:
* Bus `SMBus I801 adapter at 0500' (Algorithm unavailable)
Busdriver `i2c-i801', I2C address 0x61
Chip `SMBus 2.0 ARP-Capable Device' (confidence: 1)

Driver `it87' (may not be inserted):
Misdetects:
* ISA bus address 0x0290 (Busdriver `i2c-isa')
Chip `ITE IT8705F / IT8712F / SiS 950' (confidence: 8)

Driver `w83627hf' (should be inserted):
Detects correctly:
* ISA bus address 0x0290 (Busdriver `i2c-isa')
Chip `Winbond W83627THF Super IO Sensors' (confidence: 9)

With same modules inserted:
w83627hf 24224 0
eeprom 6168 0
i2c_sensor 3328 2 w83627hf,eeprom
i2c_isa 2304 0
i2c_i801 7692 0
i2c_core 18560 6 i2c_dev,w83627hf,eeprom,i2c_sensor,i2c_isa,i2c_i801

werewolf:~# ls /sys/bus/i2c/devices
0-0050@ 0-0052@

So i see the two DIMMS but not the 0x0290 bus.
I'm going to try with the other modules I am missing, smbus-arp and it87, but
this setup works in 2.6.9...

If you need any info, just ask for.

Hope this helps. Thanks.

--
J.A. Magallon <jamagallon()able!es> \ Software is like sex:
werewolf!able!es \ It's better when it's free
Mandrakelinux release 10.2 (Cooker) for i586
Linux 2.6.10-rc2-jam3 (gcc 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)) #1