it87 and lm85 tickets

[ppokorny@penguincomputing.com (Philip Pokorny)]

Reuben Farrelly wrote:

> Hi Philip,
>
> Philip Pokorny wrote:
>
>> Jean Delvare wrote:
>>
>>>> lm85 new stepping 0x69: ticket 1933 (khali)
>>>>   
>>>
>>>
>>>
>>> I AM NOT THE LM85 GUY!
>>>
>>> The driver was written and is maintained by Philip Pokorny and Justin
>>> Thiessen at Penguin Computing.
>>>
>>> #1933: [waiting for user data]
>>>  
>>>
>>
>> So, I guess I *am* the LM85 guy.
>>
>> Yes, please send or reply with 'i2c-dump 0 0x2e' when lm85 is *not* 
>> loaded.
>
>
> Here you go..
>
> [root@typhoon ~]# i2cdump 0 0x2e
> No size specified (using byte-data access)
> WARNING! This program can confuse your I2C bus, cause data loss and 
> worse!
> I will probe file /dev/i2c-0, address 0x2e, mode byte
> Continue? [Y/n]
>      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
> 30: 4d 4d 4d 00 00 00 00 00 00 00 00 00 00 00 01 69    MMM...........?i


So this says that it's a National Semiconductor part (0x3e is 0x01) and 
that's it's *not* an LM85 (0x3f is 0x69) but according to the lm96000 
datasheet it is a superset of the lm85 functionality.  Unfortunately, 
the only value listed for 0x3f in the lm96000 datasheet is 0x68.

So, most likely this is a later version of the lm96000.

>
> Probing for `National Semiconductor LM85 or LM96000'... Success!
>     (confidence 7, driver `lm85')


That's helpful.  Thanks Khali...

>
> The chip is pretty hard to locate on the board but if it's really 
> necessary I can try again :(


You might check again.  But instead of looking for a chip with "LM85", 
look for a 24-pin surface mount package with "LM96???" on it.  It will 
be smaller than the keys on your keyboard, but larger than the tip of a 
pen or pencil.

I'll review the LM96000 datasheet and see if there is any additional 
functionality we might want to add to the lm85 driver.

:v)