0001 Kernel driver smsc47m192
0002 ========================
0003
0004 Supported chips:
0005
0006 * SMSC LPC47M192, LPC47M15x, LPC47M292 and LPC47M997
0007
0008 Prefix: 'smsc47m192'
0009
0010 Addresses scanned: I2C 0x2c - 0x2d
0011
0012 Datasheet: The datasheet for LPC47M192 is publicly available from
0013
0014 http://www.smsc.com/
0015
0016 The LPC47M15x, LPC47M292 and LPC47M997 are compatible for
0017
0018 hardware monitoring.
0019
0020
0021
0022 Author:
0023 - Hartmut Rick <linux@rick.claranet.de>
0024
0025 - Special thanks to Jean Delvare for careful checking
0026 of the code and many helpful comments and suggestions.
0027
0028
0029 Description
0030 -----------
0031
0032 This driver implements support for the hardware sensor capabilities
0033 of the SMSC LPC47M192 and compatible Super-I/O chips.
0034
0035 These chips support 3 temperature channels and 8 voltage inputs
0036 as well as CPU voltage VID input.
0037
0038 They do also have fan monitoring and control capabilities, but the
0039 these features are accessed via ISA bus and are not supported by this
0040 driver. Use the 'smsc47m1' driver for fan monitoring and control.
0041
0042 Voltages and temperatures are measured by an 8-bit ADC, the resolution
0043 of the temperatures is 1 bit per degree C.
0044 Voltages are scaled such that the nominal voltage corresponds to
0045 192 counts, i.e. 3/4 of the full range. Thus the available range for
0046 each voltage channel is 0V ... 255/192*(nominal voltage), the resolution
0047 is 1 bit per (nominal voltage)/192.
0048 Both voltage and temperature values are scaled by 1000, the sys files
0049 show voltages in mV and temperatures in units of 0.001 degC.
0050
0051 The +12V analog voltage input channel (in4_input) is multiplexed with
0052 bit 4 of the encoded CPU voltage. This means that you either get
0053 a +12V voltage measurement or a 5 bit CPU VID, but not both.
0054 The default setting is to use the pin as 12V input, and use only 4 bit VID.
0055 This driver assumes that the information in the configuration register
0056 is correct, i.e. that the BIOS has updated the configuration if
0057 the motherboard has this input wired to VID4.
0058
0059 The temperature and voltage readings are updated once every 1.5 seconds.
0060 Reading them more often repeats the same values.
0061
0062
0063 sysfs interface
0064 ---------------
0065
0066 ===================== ==========================================================
0067 in0_input +2.5V voltage input
0068 in1_input CPU voltage input (nominal 2.25V)
0069 in2_input +3.3V voltage input
0070 in3_input +5V voltage input
0071 in4_input +12V voltage input (may be missing if used as VID4)
0072 in5_input Vcc voltage input (nominal 3.3V)
0073 This is the supply voltage of the sensor chip itself.
0074 in6_input +1.5V voltage input
0075 in7_input +1.8V voltage input
0076
0077 in[0-7]_min,
0078 in[0-7]_max lower and upper alarm thresholds for in[0-7]_input reading
0079
0080 All voltages are read and written in mV.
0081
0082 in[0-7]_alarm alarm flags for voltage inputs
0083 These files read '1' in case of alarm, '0' otherwise.
0084
0085 temp1_input chip temperature measured by on-chip diode
0086 temp[2-3]_input temperature measured by external diodes (one of these
0087 would typically be wired to the diode inside the CPU)
0088
0089 temp[1-3]_min,
0090 temp[1-3]_max lower and upper alarm thresholds for temperatures
0091
0092 temp[1-3]_offset temperature offset registers
0093 The chip adds the offsets stored in these registers to
0094 the corresponding temperature readings.
0095 Note that temp1 and temp2 offsets share the same register,
0096 they cannot both be different from zero at the same time.
0097 Writing a non-zero number to one of them will reset the other
0098 offset to zero.
0099
0100 All temperatures and offsets are read and written in
0101 units of 0.001 degC.
0102
0103 temp[1-3]_alarm alarm flags for temperature inputs, '1' in case of alarm,
0104 '0' otherwise.
0105 temp[2-3]_input_fault diode fault flags for temperature inputs 2 and 3.
0106 A fault is detected if the two pins for the corresponding
0107 sensor are open or shorted, or any of the two is shorted
0108 to ground or Vcc. '1' indicates a diode fault.
0109
0110 cpu0_vid CPU voltage as received from the CPU
0111
0112 vrm CPU VID standard used for decoding CPU voltage
0113 ===================== ==========================================================
0114
0115 The `*_min`, `*_max`, `*_offset` and `vrm` files can be read and written,
0116 all others are read-only.
