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Kernel driver `fscher.o'
=======================
Status: Stable
Tested with motherboard D1562
Think twice before you're using the write mode of some
variables, especially the watchdog
Supported chips:
* Fujitsu-Siemens Hermes chip
Prefix `fscher'
Addresses scanned: I2C 0x73
Author: Reinhard Nissl <rnissl@gmx.de> based on work from Hermann Jung
<hej@odn.de>, Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock
<phil@netroedge.com>
License: GPL
Module Parameters
-----------------
* force: short array (min = 1, max = 48)
List of adapter,address pairs to boldly assume to be present
* force_fscher: short array (min = 1, max = 48)
List of adapter,address pairs which are unquestionably assumed to contain
a `fscher' chip
* probe: short array (min = 1, max = 48)
List of adapter,address pairs to scan additionally
* probe_range: short array (min = 1, max = 48)
List of adapter,start-addr,end-addr triples to scan additionally
* ignore: short array (min = 1, max = 48)
List of adapter,address pairs not to scan
* ignore_range: short array (min = 1, max = 48)
List of adapter,start-addr,end-addr triples not to scan
Description
-----------
This driver implements support for the Fujitsu-Siemens Hermes chip.
It is described in the 'Register Set Specification BMC Hermes based
Systemboard' from Fujitsu-Siemens.
The Hermes chip implements a hardware-based system management,
e.g. for controlling fan speed and core voltage.
There is also a watchdog counter on the chip which can trigger
an alarm and even shut the system down.
The chip provides three temperature values (CPU, motherboard and auxiliary),
three voltage values (+12V, +5V and battery) and three fans (power supply,
CPU and auxiliary).
Temperatures are measured in degrees Celcius. The resolution is 1 degree.
Fan rotation speeds are reported in RPM (rotations per minute).
The value can be divided by a programmable divider (1, 2 or 4) which
is stored on the chip.
Voltage sensors (also known as "in" sensors) report their values in volts.
All values are reported as final values from the driver.
There is no need for further calculations.
Detailed description
--------------------
Below you'll find a single line description of all the bit values. With this
information, you're able to decode e. g. alarms, wdog, etc.
To make use of the watchdog, you'll need to set the watchdog time and enable
the watchdog. After that it is necessary to restart the watchdog time within
the specified period of time, or a system reset will occur.
* rev:1
READING & 0xff = 0x??: HERMES revision identification
* alarms:1
READING & 0x80 = 0x80: CPU throttling active
READING & 0x80 = 0x00: CPU running at full speed
READING & 0x10 = 0x10: software event (see control:1)
READING & 0x10 = 0x00: no software event
READING & 0x08 = 0x08: watchdog event (see wdog:2)
READING & 0x08 = 0x00: no watchdog event
READING & 0x02 = 0x02: thermal event (see temp*:1)
READING & 0x02 = 0x00: no thermal event
READING & 0x01 = 0x01: fan event (see fan*:1)
READING & 0x01 = 0x00: no fan event
READING & 0x13 ! 0x00: ALERT LED is flashing
* control:1
READING & 0x01 = 0x01: software event
READING & 0x01 = 0x00: no software event
WRITING & 0x01 = 0x01: set software event
WRITING & 0x01 = 0x00: clear software event
* wdog:3
READING & 0x80 = 0x80: power off on watchdog event while thermal event
READING & 0x80 = 0x00: watchdog power off disabled (just system reset enabled)
READING & 0x40 = 0x40: watchdog timebase 60 seconds (see also wdog:1)
READING & 0x40 = 0x00: watchdog timebase 2 seconds
READING & 0x10 = 0x10: watchdog enabled
READING & 0x10 = 0x00: watchdog disabled
WRITING & 0x80 = 0x80: enable "power off on watchdog event while thermal event"
WRITING & 0x80 = 0x00: disable "power off on watchdog event while thermal event"
WRITING & 0x40 = 0x40: set watchdog timebase to 60 seconds
WRITING & 0x40 = 0x00: set watchdog timebase to 2 seconds
WRITING & 0x20 = 0x20: disable watchdog
WRITING & 0x10 = 0x10: enable watchdog / restart watchdog time
* wdog:2
READING & 0x02 = 0x02: watchdog system reset occurred
READING & 0x02 = 0x00: no watchdog system reset occurred
WRITING & 0x02 = 0x02: clear watchdog event
* wdog:1
READING & 0xff = 0x??: configured watch dog time in units (see wdog:3 0x40)
WRITING & 0xff = 0x??: configure watch dog time in units
* in*:1 (0: +5V, 1: +12V, 2: onboard 3V battery)
READING: actual voltage value
* temp*:1 (1: CPU sensor, 2: onboard sensor, 3: auxiliary sensor)
READING & 0x02 = 0x02: thermal event (overtemperature)
READING & 0x02 = 0x00: no thermal event
READING & 0x01 = 0x01: sensor is working
READING & 0x01 = 0x00: sensor is faulty
WRITING & 0x02 = 0x02: clear thermal event
* temp*:2 (1: CPU sensor, 2: onboard sensor, 3: auxiliary sensor)
READING: actual temperature value
* fan*:1 (1: power supply fan, 2: CPU fan, 3: auxiliary fan)
READING & 0x04 = 0x04: fan event (fan fault)
READING & 0x04 = 0x00: no fan event
WRITING & 0x04 = 0x04: clear fan event
* fan*:2 (1: power supply fan, 2: CPU fan, 3: auxiliary fan)
READING & 0x03 = 0x03: 8 ripples are one fan turn
READING & 0x03 = 0x02: 4 ripples are one fan turn
READING & 0x03 = 0x01: 2 ripples are one fan turn
WRITING & 0x03 = 0x03: set prescaler to "8 ripples are one fan turn"
WRITING & 0x03 = 0x02: set prescaler to "4 ripples are one fan turn"
WRITING & 0x03 = 0x01: set prescaler to "2 ripples are one fan turn"
* fan*:3 (1: power supply fan, 2: CPU fan, 3: auxiliary fan)
READING & 0xff = 0x00: fan may be switched off
READING & 0xff = 0x01: fan must run at least at minimum speed (supply: 6V)
READING & 0xff = 0xff: fan must run at maximum speed (supply: 12V)
READING & 0xff = 0x??: fan must run at least at given speed (supply: 6V..12V)
WRITING & 0xff = 0x00: fan may be switched off
WRITING & 0xff = 0x01: fan must run at least at minimum speed (supply: 6V)
WRITING & 0xff = 0xff: fan must run at maximum speed (supply: 12V)
WRITING & 0xff = 0x??: fan must run at least at given speed (supply: 6V..12V)
* fan*:4 (1: power supply fan, 2: CPU fan, 3: auxiliary fan)
READING: actual RPM value
Limitations
-----------
* Measuring fan speed
It seems that the chip counts "ripples" (typical fans produce 2 ripples per
rotation while VERAX fans produce 18) in a 9-bit register. This register is
read out every second, then the ripple prescaler (2, 4 or 8) is applied and
the result is stored in the 8 bit output register. Due to the limitation of
the counting register to 9 bits, it is impossible to measure a VERAX fan
properly (even with a prescaler of 8). At its maximum speed of 3500 RPM the
fan produces 1080 ripples per second which causes the counting register to
overflow twice, leading to only 186 RPM.
* Measuring input voltages
in2 ("battery") reports the voltage of the onboard lithium battery and not
+3.3V from the power supply.
* Undocumented features
Fujitsu-Siemens Computers has not documented all features of the chip so far.
Their software, System Guard, shows that there are a still some features which
cannot be controled by this implementation.
Chip Features
-------------
Chip 'fscher'
LABEL LABEL CLASS COMPUTE CLASS MODE MAGN
rev - - R- 0
alarms - - R- 0
control - - RW 0
in0 - - R- 2
in1 - - R- 2
in2 - - R- 2
temp1 - - R- 0
temp2 - - R- 0
temp3 - - R- 0
temp1_state temp1 temp1 RW 0
temp2_state temp2 temp2 RW 0
temp3_state temp3 temp3 RW 0
fan1 - - R- 0
fan2 - - R- 0
fan3 - - R- 0
fan1_min fan1 fan1 RW 0
fan2_min fan2 fan2 RW 0
fan3_min fan3 fan3 RW 0
fan1_state fan1 fan1 RW 0
fan2_state fan2 fan2 RW 0
fan3_state fan3 fan3 RW 0
fan1_ripple fan1 fan1 RW 0
fan2_ripple fan2 fan2 RW 0
fan3_ripple fan3 fan3 RW 0
wdog_preset - - RW 0
wdog_state wdog_preset wdog_preset RW 0
wdog_control wdog_preset wdog_preset RW 0
LABEL FEATURE SYMBOL SYSCTL FILE:N
rev SENSORS_FSCHER_REV rev:1
alarms SENSORS_FSCHER_EVENT alarms:1
control SENSORS_FSCHER_CONTROL control:1
in0 SENSORS_FSCHER_VOLTAGE1 in0:1
in1 SENSORS_FSCHER_VOLTAGE2 in1:1
in2 SENSORS_FSCHER_VOLTAGE3 in2:1
temp1 SENSORS_FSCHER_TEMP1 temp1:2
temp2 SENSORS_FSCHER_TEMP2 temp2:2
temp3 SENSORS_FSCHER_TEMP3 temp3:2
temp1_state SENSORS_FSCHER_TEMP1_STATE temp1:1
temp2_state SENSORS_FSCHER_TEMP2_STATE temp2:1
temp3_state SENSORS_FSCHER_TEMP3_STATE temp3:1
fan1 SENSORS_FSCHER_FAN1 fan1:4
fan2 SENSORS_FSCHER_FAN2 fan2:4
fan3 SENSORS_FSCHER_FAN3 fan3:4
fan1_min SENSORS_FSCHER_FAN1_MIN fan1:2
fan2_min SENSORS_FSCHER_FAN2_MIN fan2:2
fan3_min SENSORS_FSCHER_FAN3_MIN fan3:2
fan1_state SENSORS_FSCHER_FAN1_STATE fan1:1
fan2_state SENSORS_FSCHER_FAN2_STATE fan2:1
fan3_state SENSORS_FSCHER_FAN3_STATE fan3:1
fan1_ripple SENSORS_FSCHER_FAN1_RIPPLE fan1:3
fan2_ripple SENSORS_FSCHER_FAN2_RIPPLE fan2:3
fan3_ripple SENSORS_FSCHER_FAN3_RIPPLE fan3:3
wdog_preset SENSORS_FSCHER_WDOG_PRESET wdog:1
wdog_state SENSORS_FSCHER_WDOG_STATE wdog:2
wdog_control SENSORS_FSCHER_WDOG_CONTROL wdog:3
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