103 lines
3.8 KiB
Plaintext
103 lines
3.8 KiB
Plaintext
Kernel driver smsc47m192
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========================
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Supported chips:
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* SMSC LPC47M192 and LPC47M997
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Prefix: 'smsc47m192'
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Addresses scanned: I2C 0x2c - 0x2d
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Datasheet: The datasheet for LPC47M192 is publicly available from
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http://www.smsc.com/
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The LPC47M997 is compatible for hardware monitoring.
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Author: Hartmut Rick <linux@rick.claranet.de>
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Special thanks to Jean Delvare for careful checking
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of the code and many helpful comments and suggestions.
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Description
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-----------
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This driver implements support for the hardware sensor capabilities
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of the SMSC LPC47M192 and LPC47M997 Super-I/O chips.
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These chips support 3 temperature channels and 8 voltage inputs
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as well as CPU voltage VID input.
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They do also have fan monitoring and control capabilities, but the
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these features are accessed via ISA bus and are not supported by this
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driver. Use the 'smsc47m1' driver for fan monitoring and control.
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Voltages and temperatures are measured by an 8-bit ADC, the resolution
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of the temperatures is 1 bit per degree C.
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Voltages are scaled such that the nominal voltage corresponds to
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192 counts, i.e. 3/4 of the full range. Thus the available range for
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each voltage channel is 0V ... 255/192*(nominal voltage), the resolution
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is 1 bit per (nominal voltage)/192.
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Both voltage and temperature values are scaled by 1000, the sys files
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show voltages in mV and temperatures in units of 0.001 degC.
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The +12V analog voltage input channel (in4_input) is multiplexed with
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bit 4 of the encoded CPU voltage. This means that you either get
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a +12V voltage measurement or a 5 bit CPU VID, but not both.
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The default setting is to use the pin as 12V input, and use only 4 bit VID.
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This driver assumes that the information in the configuration register
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is correct, i.e. that the BIOS has updated the configuration if
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the motherboard has this input wired to VID4.
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The temperature and voltage readings are updated once every 1.5 seconds.
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Reading them more often repeats the same values.
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sysfs interface
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---------------
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in0_input - +2.5V voltage input
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in1_input - CPU voltage input (nominal 2.25V)
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in2_input - +3.3V voltage input
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in3_input - +5V voltage input
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in4_input - +12V voltage input (may be missing if used as VID4)
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in5_input - Vcc voltage input (nominal 3.3V)
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This is the supply voltage of the sensor chip itself.
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in6_input - +1.5V voltage input
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in7_input - +1.8V voltage input
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in[0-7]_min,
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in[0-7]_max - lower and upper alarm thresholds for in[0-7]_input reading
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All voltages are read and written in mV.
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in[0-7]_alarm - alarm flags for voltage inputs
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These files read '1' in case of alarm, '0' otherwise.
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temp1_input - chip temperature measured by on-chip diode
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temp[2-3]_input - temperature measured by external diodes (one of these would
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typically be wired to the diode inside the CPU)
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temp[1-3]_min,
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temp[1-3]_max - lower and upper alarm thresholds for temperatures
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temp[1-3]_offset - temperature offset registers
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The chip adds the offsets stored in these registers to
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the corresponding temperature readings.
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Note that temp1 and temp2 offsets share the same register,
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they cannot both be different from zero at the same time.
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Writing a non-zero number to one of them will reset the other
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offset to zero.
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All temperatures and offsets are read and written in
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units of 0.001 degC.
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temp[1-3]_alarm - alarm flags for temperature inputs, '1' in case of alarm,
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'0' otherwise.
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temp[2-3]_input_fault - diode fault flags for temperature inputs 2 and 3.
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A fault is detected if the two pins for the corresponding
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sensor are open or shorted, or any of the two is shorted
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to ground or Vcc. '1' indicates a diode fault.
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cpu0_vid - CPU voltage as received from the CPU
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vrm - CPU VID standard used for decoding CPU voltage
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The *_min, *_max, *_offset and vrm files can be read and
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written, all others are read-only.
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