e95c237d78
This patch adds support for the SMSC SCH3112, SCH3114, and SCH3116 Super-I/O chips. These chips feature identical hardware monitoring capabilites with the expection that some of the fan inputs and pmw outputs don't exist. The hardware monitoring features of the SCH311x chips can only be accessed via the ISA bus. The driver therefore registers as a platform driver, if such a chip is detected. Signed-off-by: Juerg Haefliger <juergh at gmail.com> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
271 lines
11 KiB
Plaintext
271 lines
11 KiB
Plaintext
Kernel driver dme1737
|
|
=====================
|
|
|
|
Supported chips:
|
|
* SMSC DME1737 and compatibles (like Asus A8000)
|
|
Prefix: 'dme1737'
|
|
Addresses scanned: I2C 0x2c, 0x2d, 0x2e
|
|
Datasheet: Provided by SMSC upon request and under NDA
|
|
* SMSC SCH3112, SCH3114, SCH3116
|
|
Prefix: 'sch311x'
|
|
Addresses scanned: none, address read from Super-I/O config space
|
|
Datasheet: http://www.nuhorizons.com/FeaturedProducts/Volume1/SMSC/311x.pdf
|
|
|
|
Authors:
|
|
Juerg Haefliger <juergh@gmail.com>
|
|
|
|
|
|
Module Parameters
|
|
-----------------
|
|
|
|
* force_start: bool Enables the monitoring of voltage, fan and temp inputs
|
|
and PWM output control functions. Using this parameter
|
|
shouldn't be required since the BIOS usually takes care
|
|
of this.
|
|
|
|
Note that there is no need to use this parameter if the driver loads without
|
|
complaining. The driver will say so if it is necessary.
|
|
|
|
|
|
Description
|
|
-----------
|
|
|
|
This driver implements support for the hardware monitoring capabilities of the
|
|
SMSC DME1737 and Asus A8000 (which are the same) and SMSC SCH311x Super-I/O
|
|
chips. These chips feature monitoring of 3 temp sensors temp[1-3] (2 remote
|
|
diodes and 1 internal), 7 voltages in[0-6] (6 external and 1 internal) and up
|
|
to 6 fan speeds fan[1-6]. Additionally, the chips implement up to 5 PWM
|
|
outputs pwm[1-3,5-6] for controlling fan speeds both manually and
|
|
automatically.
|
|
|
|
For the DME1737 and A8000, fan[1-2] and pwm[1-2] are always present. Fan[3-6]
|
|
and pwm[3,5-6] are optional features and their availability depends on the
|
|
configuration of the chip. The driver will detect which features are present
|
|
during initialization and create the sysfs attributes accordingly.
|
|
|
|
For the SCH311x, fan[1-3] and pwm[1-3] are always present and fan[4-6] and
|
|
pwm[5-6] don't exist.
|
|
|
|
The hardware monitoring features of the DME1737 and A8000 are only accessible
|
|
via SMBus, while the SCH311x only provides access via the ISA bus. The driver
|
|
will therefore register itself as an I2C client driver if it detects a DME1737
|
|
or A8000 and as a platform driver if it detects a SCH311x chip.
|
|
|
|
|
|
Voltage Monitoring
|
|
------------------
|
|
|
|
The voltage inputs are sampled with 12-bit resolution and have internal
|
|
scaling resistors. The values returned by the driver therefore reflect true
|
|
millivolts and don't need scaling. The voltage inputs are mapped as follows
|
|
(the last column indicates the input ranges):
|
|
|
|
in0: +5VTR (+5V standby) 0V - 6.64V
|
|
in1: Vccp (processor core) 0V - 3V
|
|
in2: VCC (internal +3.3V) 0V - 4.38V
|
|
in3: +5V 0V - 6.64V
|
|
in4: +12V 0V - 16V
|
|
in5: VTR (+3.3V standby) 0V - 4.38V
|
|
in6: Vbat (+3.0V) 0V - 4.38V
|
|
|
|
Each voltage input has associated min and max limits which trigger an alarm
|
|
when crossed.
|
|
|
|
|
|
Temperature Monitoring
|
|
----------------------
|
|
|
|
Temperatures are measured with 12-bit resolution and reported in millidegree
|
|
Celsius. The chip also features offsets for all 3 temperature inputs which -
|
|
when programmed - get added to the input readings. The chip does all the
|
|
scaling by itself and the driver therefore reports true temperatures that don't
|
|
need any user-space adjustments. The temperature inputs are mapped as follows
|
|
(the last column indicates the input ranges):
|
|
|
|
temp1: Remote diode 1 (3904 type) temperature -127C - +127C
|
|
temp2: DME1737 internal temperature -127C - +127C
|
|
temp3: Remote diode 2 (3904 type) temperature -127C - +127C
|
|
|
|
Each temperature input has associated min and max limits which trigger an alarm
|
|
when crossed. Additionally, each temperature input has a fault attribute that
|
|
returns 1 when a faulty diode or an unconnected input is detected and 0
|
|
otherwise.
|
|
|
|
|
|
Fan Monitoring
|
|
--------------
|
|
|
|
Fan RPMs are measured with 16-bit resolution. The chip provides inputs for 6
|
|
fan tachometers. All 6 inputs have an associated min limit which triggers an
|
|
alarm when crossed. Fan inputs 1-4 provide type attributes that need to be set
|
|
to the number of pulses per fan revolution that the connected tachometer
|
|
generates. Supported values are 1, 2, and 4. Fan inputs 5-6 only support fans
|
|
that generate 2 pulses per revolution. Fan inputs 5-6 also provide a max
|
|
attribute that needs to be set to the maximum attainable RPM (fan at 100% duty-
|
|
cycle) of the input. The chip adjusts the sampling rate based on this value.
|
|
|
|
|
|
PWM Output Control
|
|
------------------
|
|
|
|
This chip features 5 PWM outputs. PWM outputs 1-3 are associated with fan
|
|
inputs 1-3 and PWM outputs 5-6 are associated with fan inputs 5-6. PWM outputs
|
|
1-3 can be configured to operate either in manual or automatic mode by setting
|
|
the appropriate enable attribute accordingly. PWM outputs 5-6 can only operate
|
|
in manual mode, their enable attributes are therefore read-only. When set to
|
|
manual mode, the fan speed is set by writing the duty-cycle value to the
|
|
appropriate PWM attribute. In automatic mode, the PWM attribute returns the
|
|
current duty-cycle as set by the fan controller in the chip. All PWM outputs
|
|
support the setting of the output frequency via the freq attribute.
|
|
|
|
In automatic mode, the chip supports the setting of the PWM ramp rate which
|
|
defines how fast the PWM output is adjusting to changes of the associated
|
|
temperature input. Associating PWM outputs to temperature inputs is done via
|
|
temperature zones. The chip features 3 zones whose assignments to temperature
|
|
inputs is static and determined during initialization. These assignments can
|
|
be retrieved via the zone[1-3]_auto_channels_temp attributes. Each PWM output
|
|
is assigned to one (or hottest of multiple) temperature zone(s) through the
|
|
pwm[1-3]_auto_channels_zone attributes. Each PWM output has 3 distinct output
|
|
duty-cycles: full, low, and min. Full is internally hard-wired to 255 (100%)
|
|
and low and min can be programmed via pwm[1-3]_auto_point1_pwm and
|
|
pwm[1-3]_auto_pwm_min, respectively. The thermal thresholds of the zones are
|
|
programmed via zone[1-3]_auto_point[1-3]_temp and
|
|
zone[1-3]_auto_point1_temp_hyst:
|
|
|
|
pwm[1-3]_auto_point2_pwm full-speed duty-cycle (255, i.e., 100%)
|
|
pwm[1-3]_auto_point1_pwm low-speed duty-cycle
|
|
pwm[1-3]_auto_pwm_min min-speed duty-cycle
|
|
|
|
zone[1-3]_auto_point3_temp full-speed temp (all outputs)
|
|
zone[1-3]_auto_point2_temp full-speed temp
|
|
zone[1-3]_auto_point1_temp low-speed temp
|
|
zone[1-3]_auto_point1_temp_hyst min-speed temp
|
|
|
|
The chip adjusts the output duty-cycle linearly in the range of auto_point1_pwm
|
|
to auto_point2_pwm if the temperature of the associated zone is between
|
|
auto_point1_temp and auto_point2_temp. If the temperature drops below the
|
|
auto_point1_temp_hyst value, the output duty-cycle is set to the auto_pwm_min
|
|
value which only supports two values: 0 or auto_point1_pwm. That means that the
|
|
fan either turns completely off or keeps spinning with the low-speed
|
|
duty-cycle. If any of the temperatures rise above the auto_point3_temp value,
|
|
all PWM outputs are set to 100% duty-cycle.
|
|
|
|
Following is another representation of how the chip sets the output duty-cycle
|
|
based on the temperature of the associated thermal zone:
|
|
|
|
Duty-Cycle Duty-Cycle
|
|
Temperature Rising Temp Falling Temp
|
|
----------- ----------- ------------
|
|
full-speed full-speed full-speed
|
|
|
|
< linearly adjusted duty-cycle >
|
|
|
|
low-speed low-speed low-speed
|
|
min-speed low-speed
|
|
min-speed min-speed min-speed
|
|
min-speed min-speed
|
|
|
|
|
|
Sysfs Attributes
|
|
----------------
|
|
|
|
Following is a list of all sysfs attributes that the driver provides, their
|
|
permissions and a short description:
|
|
|
|
Name Perm Description
|
|
---- ---- -----------
|
|
cpu0_vid RO CPU core reference voltage in
|
|
millivolts.
|
|
vrm RW Voltage regulator module version
|
|
number.
|
|
|
|
in[0-6]_input RO Measured voltage in millivolts.
|
|
in[0-6]_min RW Low limit for voltage input.
|
|
in[0-6]_max RW High limit for voltage input.
|
|
in[0-6]_alarm RO Voltage input alarm. Returns 1 if
|
|
voltage input is or went outside the
|
|
associated min-max range, 0 otherwise.
|
|
|
|
temp[1-3]_input RO Measured temperature in millidegree
|
|
Celsius.
|
|
temp[1-3]_min RW Low limit for temp input.
|
|
temp[1-3]_max RW High limit for temp input.
|
|
temp[1-3]_offset RW Offset for temp input. This value will
|
|
be added by the chip to the measured
|
|
temperature.
|
|
temp[1-3]_alarm RO Alarm for temp input. Returns 1 if temp
|
|
input is or went outside the associated
|
|
min-max range, 0 otherwise.
|
|
temp[1-3]_fault RO Temp input fault. Returns 1 if the chip
|
|
detects a faulty thermal diode or an
|
|
unconnected temp input, 0 otherwise.
|
|
|
|
zone[1-3]_auto_channels_temp RO Temperature zone to temperature input
|
|
mapping. This attribute is a bitfield
|
|
and supports the following values:
|
|
1: temp1
|
|
2: temp2
|
|
4: temp3
|
|
zone[1-3]_auto_point1_temp_hyst RW Auto PWM temp point1 hysteresis. The
|
|
output of the corresponding PWM is set
|
|
to the pwm_auto_min value if the temp
|
|
falls below the auto_point1_temp_hyst
|
|
value.
|
|
zone[1-3]_auto_point[1-3]_temp RW Auto PWM temp points. Auto_point1 is
|
|
the low-speed temp, auto_point2 is the
|
|
full-speed temp, and auto_point3 is the
|
|
temp at which all PWM outputs are set
|
|
to full-speed (100% duty-cycle).
|
|
|
|
fan[1-6]_input RO Measured fan speed in RPM.
|
|
fan[1-6]_min RW Low limit for fan input.
|
|
fan[1-6]_alarm RO Alarm for fan input. Returns 1 if fan
|
|
input is or went below the associated
|
|
min value, 0 otherwise.
|
|
fan[1-4]_type RW Type of attached fan. Expressed in
|
|
number of pulses per revolution that
|
|
the fan generates. Supported values are
|
|
1, 2, and 4.
|
|
fan[5-6]_max RW Max attainable RPM at 100% duty-cycle.
|
|
Required for chip to adjust the
|
|
sampling rate accordingly.
|
|
|
|
pmw[1-3,5-6] RO/RW Duty-cycle of PWM output. Supported
|
|
values are 0-255 (0%-100%). Only
|
|
writeable if the associated PWM is in
|
|
manual mode.
|
|
pwm[1-3]_enable RW Enable of PWM outputs 1-3. Supported
|
|
values are:
|
|
0: turned off (output @ 100%)
|
|
1: manual mode
|
|
2: automatic mode
|
|
pwm[5-6]_enable RO Enable of PWM outputs 5-6. Always
|
|
returns 1 since these 2 outputs are
|
|
hard-wired to manual mode.
|
|
pmw[1-3,5-6]_freq RW Frequency of PWM output. Supported
|
|
values are in the range 11Hz-30000Hz
|
|
(default is 25000Hz).
|
|
pmw[1-3]_ramp_rate RW Ramp rate of PWM output. Determines how
|
|
fast the PWM duty-cycle will change
|
|
when the PWM is in automatic mode.
|
|
Expressed in ms per PWM step. Supported
|
|
values are in the range 0ms-206ms
|
|
(default is 0, which means the duty-
|
|
cycle changes instantly).
|
|
pwm[1-3]_auto_channels_zone RW PWM output to temperature zone mapping.
|
|
This attribute is a bitfield and
|
|
supports the following values:
|
|
1: zone1
|
|
2: zone2
|
|
4: zone3
|
|
6: highest of zone[2-3]
|
|
7: highest of zone[1-3]
|
|
pwm[1-3]_auto_pwm_min RW Auto PWM min pwm. Minimum PWM duty-
|
|
cycle. Supported values are 0 or
|
|
auto_point1_pwm.
|
|
pwm[1-3]_auto_point1_pwm RW Auto PWM pwm point. Auto_point1 is the
|
|
low-speed duty-cycle.
|
|
pwm[1-3]_auto_point2_pwm RO Auto PWM pwm point. Auto_point2 is the
|
|
full-speed duty-cycle which is hard-
|
|
wired to 255 (100% duty-cycle).
|