7ebd8b66dd
Now that all files were converted to ReST format, rename them and add an index. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
114 lines
4.2 KiB
ReStructuredText
114 lines
4.2 KiB
ReStructuredText
Kernel driver w83793
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====================
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Supported chips:
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* Winbond W83793G/W83793R
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Prefix: 'w83793'
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Addresses scanned: I2C 0x2c - 0x2f
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Datasheet: Still not published
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Authors:
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- Yuan Mu (Winbond Electronics)
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- Rudolf Marek <r.marek@assembler.cz>
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Module parameters
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-----------------
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* reset int
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(default 0)
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This parameter is not recommended, it will lose motherboard specific
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settings. Use 'reset=1' to reset the chip when loading this module.
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* force_subclients=bus,caddr,saddr1,saddr2
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This is used to force the i2c addresses for subclients of
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a certain chip. Typical usage is `force_subclients=0,0x2f,0x4a,0x4b`
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to force the subclients of chip 0x2f on bus 0 to i2c addresses
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0x4a and 0x4b.
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Description
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-----------
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This driver implements support for Winbond W83793G/W83793R chips.
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* Exported features
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This driver exports 10 voltage sensors, up to 12 fan tachometer inputs,
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6 remote temperatures, up to 8 sets of PWM fan controls, SmartFan
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(automatic fan speed control) on all temperature/PWM combinations, 2
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sets of 6-pin CPU VID input.
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* Sensor resolutions
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If your motherboard maker used the reference design, the resolution of
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voltage0-2 is 2mV, resolution of voltage3/4/5 is 16mV, 8mV for voltage6,
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24mV for voltage7/8. Temp1-4 have a 0.25 degree Celsius resolution,
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temp5-6 have a 1 degree Celsiis resolution.
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* Temperature sensor types
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Temp1-4 have 2 possible types. It can be read from (and written to)
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temp[1-4]_type.
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- If the value is 3, it starts monitoring using a remote termal diode
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(default).
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- If the value is 6, it starts monitoring using the temperature sensor
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in Intel CPU and get result by PECI.
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Temp5-6 can be connected to external thermistors (value of
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temp[5-6]_type is 4).
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* Alarm mechanism
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For voltage sensors, an alarm triggers if the measured value is below
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the low voltage limit or over the high voltage limit.
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For temperature sensors, an alarm triggers if the measured value goes
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above the high temperature limit, and wears off only after the measured
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value drops below the hysteresis value.
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For fan sensors, an alarm triggers if the measured value is below the
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low speed limit.
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* SmartFan/PWM control
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If you want to set a pwm fan to manual mode, you just need to make sure it
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is not controlled by any temp channel, for example, you want to set fan1
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to manual mode, you need to check the value of temp[1-6]_fan_map, make
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sure bit 0 is cleared in the 6 values. And then set the pwm1 value to
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control the fan.
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Each temperature channel can control all the 8 PWM outputs (by setting the
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corresponding bit in tempX_fan_map), you can set the temperature channel
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mode using temp[1-6]_pwm_enable, 2 is Thermal Cruise mode and 3
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is the SmartFanII mode. Temperature channels will try to speed up or
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slow down all controlled fans, this means one fan can receive different
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PWM value requests from different temperature channels, but the chip
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will always pick the safest (max) PWM value for each fan.
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In Thermal Cruise mode, the chip attempts to keep the temperature at a
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predefined value, within a tolerance margin. So if tempX_input >
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thermal_cruiseX + toleranceX, the chip will increase the PWM value,
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if tempX_input < thermal_cruiseX - toleranceX, the chip will decrease
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the PWM value. If the temperature is within the tolerance range, the PWM
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value is left unchanged.
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SmartFanII works differently, you have to define up to 7 PWM, temperature
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trip points, defining a PWM/temperature curve which the chip will follow.
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While not fundamentally different from the Thermal Cruise mode, the
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implementation is quite different, giving you a finer-grained control.
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* Chassis
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If the case open alarm triggers, it will stay in this state unless cleared
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by writing 0 to the sysfs file "intrusion0_alarm".
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* VID and VRM
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The VRM version is detected automatically, don't modify the it unless you
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*do* know the cpu VRM version and it's not properly detected.
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Notes
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-----
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Only Fan1-5 and PWM1-3 are guaranteed to always exist, other fan inputs and
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PWM outputs may or may not exist depending on the chip pin configuration.
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