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-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: Available on the Internet
- * SMSC SCH5027
- Prefix: 'sch5027'
- Addresses scanned: I2C 0x2c, 0x2d, 0x2e
- Datasheet: Provided by SMSC upon request and under NDA
- * SMSC SCH5127
- Prefix: 'sch5127'
- Addresses scanned: none, address read from Super-I/O config space
- Datasheet: Provided by SMSC upon request and under NDA
-
-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.
-* probe_all_addr: bool Include non-standard LPC addresses 0x162e and 0x164e
- when probing for ISA devices. This is required for the
- following boards:
- - VIA EPIA SN18000
-
-
-Description
------------
-
-This driver implements support for the hardware monitoring capabilities of the
-SMSC DME1737 and Asus A8000 (which are the same), SMSC SCH5027, SCH311x,
-and SCH5127 Super-I/O chips. These chips feature monitoring of 3 temp sensors
-temp[1-3] (2 remote diodes and 1 internal), 8 voltages in[0-7] (7 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, A8000 and SCH5027, 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 and SCH5127, 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, A8000, and SCH5027 are only
-accessible via SMBus, while the SCH311x and SCH5127 only provide access via
-the ISA bus. The driver will therefore register itself as an I2C client driver
-if it detects a DME1737, A8000, or SCH5027 and as a platform driver if it
-detects a SCH311x or SCH5127 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):
-
-DME1737, A8000:
- 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
-
-SCH311x:
- in0: +2.5V 0V - 3.32V
- in1: Vccp (processor core) 0V - 2V
- 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
-
-SCH5027:
- in0: +5VTR (+5V standby) 0V - 6.64V
- in1: Vccp (processor core) 0V - 3V
- in2: VCC (internal +3.3V) 0V - 4.38V
- in3: V2_IN 0V - 1.5V
- in4: V1_IN 0V - 1.5V
- in5: VTR (+3.3V standby) 0V - 4.38V
- in6: Vbat (+3.0V) 0V - 4.38V
-
-SCH5127:
- in0: +2.5 0V - 3.32V
- in1: Vccp (processor core) 0V - 3V
- in2: VCC (internal +3.3V) 0V - 4.38V
- in3: V2_IN 0V - 1.5V
- in4: V1_IN 0V - 1.5V
- in5: VTR (+3.3V standby) 0V - 4.38V
- in6: Vbat (+3.0V) 0V - 4.38V
- in7: Vtrip (+1.5V) 0V - 1.99V
-
-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[0-7]_input RO Measured voltage in millivolts.
-in[0-7]_min RW Low limit for voltage input.
-in[0-7]_max RW High limit for voltage input.
-in[0-7]_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).
-
-Chip Differences
-----------------
-
-Feature dme1737 sch311x sch5027 sch5127
--------------------------------------------------------
-temp[1-3]_offset yes yes
-vid yes
-zone3 yes yes yes
-zone[1-3]_hyst yes yes
-pwm min/off yes yes
-fan3 opt yes opt yes
-pwm3 opt yes opt yes
-fan4 opt opt
-fan5 opt opt
-pwm5 opt opt
-fan6 opt opt
-pwm6 opt opt
-in7 yes