Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver smsc47m192 2 ======================== 3 4 Supported chips: 5 * SMSC LPC47M192, LPC47M15x, LPC47M292 and LPC47M997 6 Prefix: 'smsc47m192' 7 Addresses scanned: I2C 0x2c - 0x2d 8 Datasheet: The datasheet for LPC47M192 is publicly available from 9 http://www.smsc.com/ 10 The LPC47M15x, LPC47M292 and LPC47M997 are compatible for 11 hardware monitoring. 12 13 Author: Hartmut Rick <linux@rick.claranet.de> 14 Special thanks to Jean Delvare for careful checking 15 of the code and many helpful comments and suggestions. 16 17 18 Description 19 ----------- 20 21 This driver implements support for the hardware sensor capabilities 22 of the SMSC LPC47M192 and compatible Super-I/O chips. 23 24 These chips support 3 temperature channels and 8 voltage inputs 25 as well as CPU voltage VID input. 26 27 They do also have fan monitoring and control capabilities, but the 28 these features are accessed via ISA bus and are not supported by this 29 driver. Use the 'smsc47m1' driver for fan monitoring and control. 30 31 Voltages and temperatures are measured by an 8-bit ADC, the resolution 32 of the temperatures is 1 bit per degree C. 33 Voltages are scaled such that the nominal voltage corresponds to 34 192 counts, i.e. 3/4 of the full range. Thus the available range for 35 each voltage channel is 0V ... 255/192*(nominal voltage), the resolution 36 is 1 bit per (nominal voltage)/192. 37 Both voltage and temperature values are scaled by 1000, the sys files 38 show voltages in mV and temperatures in units of 0.001 degC. 39 40 The +12V analog voltage input channel (in4_input) is multiplexed with 41 bit 4 of the encoded CPU voltage. This means that you either get 42 a +12V voltage measurement or a 5 bit CPU VID, but not both. 43 The default setting is to use the pin as 12V input, and use only 4 bit VID. 44 This driver assumes that the information in the configuration register 45 is correct, i.e. that the BIOS has updated the configuration if 46 the motherboard has this input wired to VID4. 47 48 The temperature and voltage readings are updated once every 1.5 seconds. 49 Reading them more often repeats the same values. 50 51 52 sysfs interface 53 --------------- 54 55 in0_input - +2.5V voltage input 56 in1_input - CPU voltage input (nominal 2.25V) 57 in2_input - +3.3V voltage input 58 in3_input - +5V voltage input 59 in4_input - +12V voltage input (may be missing if used as VID4) 60 in5_input - Vcc voltage input (nominal 3.3V) 61 This is the supply voltage of the sensor chip itself. 62 in6_input - +1.5V voltage input 63 in7_input - +1.8V voltage input 64 65 in[0-7]_min, 66 in[0-7]_max - lower and upper alarm thresholds for in[0-7]_input reading 67 68 All voltages are read and written in mV. 69 70 in[0-7]_alarm - alarm flags for voltage inputs 71 These files read '1' in case of alarm, '0' otherwise. 72 73 temp1_input - chip temperature measured by on-chip diode 74 temp[2-3]_input - temperature measured by external diodes (one of these would 75 typically be wired to the diode inside the CPU) 76 77 temp[1-3]_min, 78 temp[1-3]_max - lower and upper alarm thresholds for temperatures 79 80 temp[1-3]_offset - temperature offset registers 81 The chip adds the offsets stored in these registers to 82 the corresponding temperature readings. 83 Note that temp1 and temp2 offsets share the same register, 84 they cannot both be different from zero at the same time. 85 Writing a non-zero number to one of them will reset the other 86 offset to zero. 87 88 All temperatures and offsets are read and written in 89 units of 0.001 degC. 90 91 temp[1-3]_alarm - alarm flags for temperature inputs, '1' in case of alarm, 92 '0' otherwise. 93 temp[2-3]_input_fault - diode fault flags for temperature inputs 2 and 3. 94 A fault is detected if the two pins for the corresponding 95 sensor are open or shorted, or any of the two is shorted 96 to ground or Vcc. '1' indicates a diode fault. 97 98 cpu0_vid - CPU voltage as received from the CPU 99 100 vrm - CPU VID standard used for decoding CPU voltage 101 102 The *_min, *_max, *_offset and vrm files can be read and 103 written, all others are read-only.