* [lm-sensors] help with i2cdetect
@ 2012-08-01 23:10 ed in 92626
2012-08-01 23:42 ` Guenter Roeck
2012-08-02 6:18 ` Jean Delvare
0 siblings, 2 replies; 3+ messages in thread
From: ed in 92626 @ 2012-08-01 23:10 UTC (permalink / raw)
To: lm-sensors
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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
2012-08-01 23:10 [lm-sensors] help with i2cdetect ed in 92626
@ 2012-08-01 23:42 ` Guenter Roeck
2012-08-02 6:18 ` Jean Delvare
1 sibling, 0 replies; 3+ messages in thread
From: Guenter Roeck @ 2012-08-01 23:42 UTC (permalink / raw)
To: lm-sensors
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
2012-08-01 23:10 [lm-sensors] help with i2cdetect ed in 92626
2012-08-01 23:42 ` Guenter Roeck
@ 2012-08-02 6:18 ` Jean Delvare
1 sibling, 0 replies; 3+ messages in thread
From: Jean Delvare @ 2012-08-02 6:18 UTC (permalink / raw)
To: lm-sensors
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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2012-08-01 23:10 [lm-sensors] help with i2cdetect ed in 92626
2012-08-01 23:42 ` Guenter Roeck
2012-08-02 6:18 ` Jean Delvare
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