From mboxrd@z Thu Jan  1 00:00:00 1970
From: Guenter Roeck <guenter.roeck@ericsson.com>
Date: Sat, 12 Feb 2011 17:47:31 +0000
Subject: Re: [lm-sensors] [PATCH v3 7/7] hwmon: (w83627ehf) Use 16 bit fan
Message-Id: <20110212174731.GA9174@ericsson.com>
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To: lm-sensors@vger.kernel.org

On Sat, Feb 12, 2011 at 11:01:11AM -0500, Andrew Lutomirski wrote:
[ ... ]
> 
> fan2_min = 200 (div = 64):
> fan2_input = 138 (read at a different time, so may differ a little)
> 
> [56013.556233] Reg 0028 = 46
> [56013.556243] Reg 0029 = 99
> [56013.556252] Reg 002a = 00
> [56013.556261] Reg 003f = 00
> [56013.556286] Reg 0630 = 0046
> [56013.556302] Reg 0631 = 4600
> [56013.556319] Reg 0632 = 0099
> [56013.556336] Reg 0633 = 9900
> [56013.556352] Reg 0634 = 0000
> [56013.556369] Reg 0635 = 0000
> [56013.556386] Reg 0636 = 0000
> [56013.556403] Reg 0637 = 0000
> [56013.556419] Reg 0656 = 025a
> [56013.556436] Reg 0657 = 5a00
> [56013.556453] Reg 0658 = 0089
> [56013.556469] Reg 0659 = 8900
> [56013.556486] Reg 065a = 0000
> [56013.556502] Reg 065b = 0000
> [56013.556519] Reg 065c = 0000
> [56013.556536] Reg 065d = 0000
> 
> 
> fan2_min = 502 (div = 32):
> fan2_input = 0 (read at a different time, so may differ a little)
> 
> [56085.471272] w83627ehf: Found NCT6775F chip at 0x290
> [56085.471557] Reg 0028 = 45
> [56085.471567] Reg 0029 = 00
> [56085.471575] Reg 002a = 00
> [56085.471584] Reg 003f = 00
> [56085.471610] Reg 0630 = 0045
> [56085.471627] Reg 0631 = 4500
> [56085.471644] Reg 0632 = 0000
> [56085.471661] Reg 0633 = 0000
> [56085.471677] Reg 0634 = 0000
> [56085.471694] Reg 0635 = 0000
> [56085.471711] Reg 0636 = 0000
> [56085.471728] Reg 0637 = 0000
> [56085.471751] Reg 0656 = 0263
> [56085.471780] Reg 0657 = 6300
> [56085.471804] Reg 0658 = 0000
> [56085.471829] Reg 0659 = 0000
> [56085.471846] Reg 065a = 0000
> [56085.471864] Reg 065b = 0000
> [56085.471881] Reg 065c = 0000
> [56085.471898] Reg 065d = 0000
> 
> I assume it's 0x658 that should hold the RPM value.
> 
Yes, for fan2. 0x656 would be fan1. Looks like that works.

> If you haven't solved it remotely by Monday, I'll email Nuvoton and
> ask for that datasheet...
> 
Might be a good idea anyway.

My take is that we might have to use the rpm registers directly. I'll prepare 
a patch for that. I'll also ask a contact at Nuvoton if they have an idea 
what is going on.

Thanks,
Guenter

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