From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philipp Kraus <philipp.kraus@flashpixx.de>
Date: Mon, 02 Jul 2012 01:28:19 +0000
Subject: Re: [lm-sensors] CPU fan with full speed
Message-Id: <jsqta8$lu4$1@dough.gmane.org>
List-Id: <lm-sensors.vger.kernel.org>
References: <jsm40t$qk8$1@dough.gmane.org>
In-Reply-To: <jsm40t$qk8$1@dough.gmane.org>
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To: lm-sensors@vger.kernel.org

On 2012-07-02 03:14:03 +0200, Philipp Kraus said:

> On 2012-06-30 21:24:59 +0200, Guenter Roeck said:
> 
>> On Sat, Jun 30, 2012 at 07:27:49PM +0200, Philipp Kraus wrote:
>>> On 2012-06-30 19:03:44 +0200, Guenter Roeck said:
>>> 
>>>> On Sat, Jun 30, 2012 at 06:04:53PM +0200, Philipp Kraus wrote:
>>>>> On 2012-06-30 17:33:38 +0200, Guenter Roeck said:
>>>>> 
>>>>>> On Sat, Jun 30, 2012 at 04:37:28PM +0200, Philipp Kraus wrote:
>>>>>>> 
>>>>>>> the grep command shows
>>>>>>> grep: /sys/class/hwmon/hwmon1/device/driver: Is a directory
>>>>>>> grep: /sys/class/hwmon/hwmon1/device/hwmon: Is a directory
>>>>>>> grep: /sys/class/hwmon/hwmon1/device/power: Is a directory
>>>>>>> grep: /sys/class/hwmon/hwmon1/device/subsystem: Is a directory
>>>>>>> 
>>>>>>> and within the directory are the in*, pwm* temp* files
>>>>>>> 
>>>>>> Not sure I understand.
>>>>>> 
>>>>>> I'll need the names and output for the pwm* and temp* files. They
>>>>>> _should_ be in
>>>>>> /sys/class/hwmon/hwmon1/device/pwm* and /sys/class/hwmon/hwmon1/device/temp*.
>>>>> 
>>>>> the command grep /sys.... does not work, I have run an ls -l and
>>>> 
>>>> Phil,
>>>> 
>>>> It wasn't "grep /sys/...", it was "grep . /sys/class/hwmon/hwmon1/device/*".
>>>> The "." is important. Your output gives me the file names, but I need names and
>>>> content, not names and permissions.
>>> 
>>> Sorry, my mistake, I haven't seen that it ist "grep . <space> /sys..."
>>> Hope this the correct output now
>>> 
>>> /sys/class/hwmon/hwmon1/device/pwm1:252
>> 
>> Looks like all pwm values report the "default" pwm value.
>> 
>>> /sys/class/hwmon/hwmon1/device/temp1_auto_channels_pwm:1
>> 
>> If I understand the code and the data sheet correectly, this attribute
>> is a bit map used to map a temperature source to one or multiple fans.
>> And it looks like all temperature sources are mapped to fan1, which
>> in turn means that effectively temp4 controls the speed of fan1 (the highest
>> temperature determines the fan speed), and all other fans are not mapped to
>> a temperature input.
>> 
>> What you should probably do is to find the association between tempX and pwmX
>> and program tempX_auto_channels_pwm such that the two map.
>> For example, if temp1
>> is the CPU1 temperature, and pwm4 (fan4) is connected to the CPU1 fan, write
>> 0b00001000 = 0x08 into /sys/class/hwmon/hwmon1/device/temp1_auto_channels_pwm.
>> Similar, if temp2 is the CPU2 temperature and fan5/pwm5 controls its fan,
>> write 0x10 () into /sys/class/hwmon/hwmon1/device/temp2_auto_channels_pwm.
> 
> You are write, temp1 and temp2 are the values for the CPU 1 and CPU 2.
> The fans for the CPU
> are fan7 = CPU 1 and fan8 = CPU 2
> 
> Can you explane me in detail how you create the map 0b00001000 = 0x08 ?
> I think 0x08 = 0x8 = 8 is a hexadecimal value but is this 0b00001000
> also a hexadecimal value, in this case both values are not equal !?
> Should I write with echo -e "\x8" >
> /sys/class/hwmon/hwmon1/device/temp1_auto_channels_pwm ?
> 
> IMHO I must enable (1) the n-th bit on the auto_channels_pwm value for
> the n-th fan, so in my configuration the 7 and 8 bit (begin = 0)?

I have set with
echo 128 >  /sys/class/hwmon/hwmon1/device/temp1_auto_channels_pwm
echo 256 >  /sys/class/hwmon/hwmon1/device/temp2_auto_channels_pwm

the 7th and 8th fan-bit but nothing is changed

phil



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