1Kernel driver smsc47m192 2======================== 3 4Supported chips: 5 6 * SMSC LPC47M192, LPC47M15x, LPC47M292 and LPC47M997 7 8 Prefix: 'smsc47m192' 9 10 Addresses scanned: I2C 0x2c - 0x2d 11 12 Datasheet: The datasheet for LPC47M192 is publicly available from 13 14 http://www.smsc.com/ 15 16 The LPC47M15x, LPC47M292 and LPC47M997 are compatible for 17 18 hardware monitoring. 19 20 21 22Author: 23 - Hartmut Rick <linux@rick.claranet.de> 24 25 - Special thanks to Jean Delvare for careful checking 26 of the code and many helpful comments and suggestions. 27 28 29Description 30----------- 31 32This driver implements support for the hardware sensor capabilities 33of the SMSC LPC47M192 and compatible Super-I/O chips. 34 35These chips support 3 temperature channels and 8 voltage inputs 36as well as CPU voltage VID input. 37 38They do also have fan monitoring and control capabilities, but the 39these features are accessed via ISA bus and are not supported by this 40driver. Use the 'smsc47m1' driver for fan monitoring and control. 41 42Voltages and temperatures are measured by an 8-bit ADC, the resolution 43of the temperatures is 1 bit per degree C. 44Voltages are scaled such that the nominal voltage corresponds to 45192 counts, i.e. 3/4 of the full range. Thus the available range for 46each voltage channel is 0V ... 255/192*(nominal voltage), the resolution 47is 1 bit per (nominal voltage)/192. 48Both voltage and temperature values are scaled by 1000, the sys files 49show voltages in mV and temperatures in units of 0.001 degC. 50 51The +12V analog voltage input channel (in4_input) is multiplexed with 52bit 4 of the encoded CPU voltage. This means that you either get 53a +12V voltage measurement or a 5 bit CPU VID, but not both. 54The default setting is to use the pin as 12V input, and use only 4 bit VID. 55This driver assumes that the information in the configuration register 56is correct, i.e. that the BIOS has updated the configuration if 57the motherboard has this input wired to VID4. 58 59The temperature and voltage readings are updated once every 1.5 seconds. 60Reading them more often repeats the same values. 61 62 63sysfs interface 64--------------- 65 66===================== ========================================================== 67in0_input +2.5V voltage input 68in1_input CPU voltage input (nominal 2.25V) 69in2_input +3.3V voltage input 70in3_input +5V voltage input 71in4_input +12V voltage input (may be missing if used as VID4) 72in5_input Vcc voltage input (nominal 3.3V) 73 This is the supply voltage of the sensor chip itself. 74in6_input +1.5V voltage input 75in7_input +1.8V voltage input 76 77in[0-7]_min, 78in[0-7]_max lower and upper alarm thresholds for in[0-7]_input reading 79 80 All voltages are read and written in mV. 81 82in[0-7]_alarm alarm flags for voltage inputs 83 These files read '1' in case of alarm, '0' otherwise. 84 85temp1_input chip temperature measured by on-chip diode 86temp[2-3]_input temperature measured by external diodes (one of these 87 would typically be wired to the diode inside the CPU) 88 89temp[1-3]_min, 90temp[1-3]_max lower and upper alarm thresholds for temperatures 91 92temp[1-3]_offset temperature offset registers 93 The chip adds the offsets stored in these registers to 94 the corresponding temperature readings. 95 Note that temp1 and temp2 offsets share the same register, 96 they cannot both be different from zero at the same time. 97 Writing a non-zero number to one of them will reset the other 98 offset to zero. 99 100 All temperatures and offsets are read and written in 101 units of 0.001 degC. 102 103temp[1-3]_alarm alarm flags for temperature inputs, '1' in case of alarm, 104 '0' otherwise. 105temp[2-3]_input_fault diode fault flags for temperature inputs 2 and 3. 106 A fault is detected if the two pins for the corresponding 107 sensor are open or shorted, or any of the two is shorted 108 to ground or Vcc. '1' indicates a diode fault. 109 110cpu0_vid CPU voltage as received from the CPU 111 112vrm CPU VID standard used for decoding CPU voltage 113===================== ========================================================== 114 115The `*_min`, `*_max`, `*_offset` and `vrm` files can be read and written, 116all others are read-only. 117