[lm-sensors] help with i2cdetect

[lm-sensors] help with i2cdetect

[ed in 92626]

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Hi,

I am using your software for the first time.
Does it work on Fedora17, kernel 3.1.0?

When I run it, 'i2cdetect -l' I get no devices back.

When I try i2cdump 0xa8 3 I get
could not open file /dev/;i2c/168.

A8 is he address of my DIMM memory modue.

Does every i2c device need to have an entry in
/dev? I checked two machines and don't see
any i2c under /dev.

thanks if you have any info.

Ed

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Re: [lm-sensors] help with i2cdetect

[Guenter Roeck]

On Wed, Aug 01, 2012 at 04:10:41PM -0700, ed in 92626 wrote:
> Hi,
> 
> I am using your software for the first time.
> Does it work on Fedora17, kernel 3.1.0?
> 
> When I run it, 'i2cdetect -l' I get no devices back.
> 
> When I try i2cdump 0xa8 3 I get
> could not open file /dev/;i2c/168.
> 
> A8 is he address of my DIMM memory modue.
> 
> Does every i2c device need to have an entry in
> /dev? I checked two machines and don't see
> any i2c under /dev.
> 
> thanks if you have any info.
> 
Execute "sudo modprobe i2c-dev" first. Otherwise you won't see the i2c devices
in /dev.

Guenter

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Re: [lm-sensors] help with i2cdetect

[Jean Delvare]

On Wed, 1 Aug 2012 16:10:41 -0700, ed in 92626 wrote:
> When I try i2cdump 0xa8 3 I get
> could not open file /dev/i2c/168.

You passed the parameter in the wrong order, bus number must be first
and slave address second.

> A8 is the address of my DIMM memory module.

Maybe in some document you have, it is, but not for the Linux kernel,
which uses right-aligned 7-bit slave addresses. 0xa8 is obviously a
left-aligned 7-bit address. So the address you actually want to pass to
i2cdump is 0xA8 >> 1 = 0x54.

-- 
Jean Delvare

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