1*4882a593SmuzhiyunKernel driver nct7904 2*4882a593Smuzhiyun===================== 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunSupported chip: 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun * Nuvoton NCT7904D 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun Prefix: nct7904 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun Addresses: I2C 0x2d, 0x2e 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun Datasheet: Publicly available at Nuvoton website 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun http://www.nuvoton.com/ 15*4882a593Smuzhiyun 16*4882a593SmuzhiyunAuthor: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru> 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun 19*4882a593SmuzhiyunDescription 20*4882a593Smuzhiyun----------- 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunThe NCT7904D is a hardware monitor supporting up to 20 voltage sensors, 23*4882a593Smuzhiyuninternal temperature sensor, Intel PECI and AMD SB-TSI CPU temperature 24*4882a593Smuzhiyuninterface, up to 12 fan tachometer inputs, up to 4 fan control channels 25*4882a593Smuzhiyunwith SmartFan. 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun 28*4882a593SmuzhiyunSysfs entries 29*4882a593Smuzhiyun------------- 30*4882a593Smuzhiyun 31*4882a593SmuzhiyunCurrently, the driver supports only the following features: 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun======================= ======================================================= 34*4882a593Smuzhiyunin[1-20]_input Input voltage measurements (mV) 35*4882a593Smuzhiyun 36*4882a593Smuzhiyunfan[1-12]_input Fan tachometer measurements (rpm) 37*4882a593Smuzhiyun 38*4882a593Smuzhiyuntemp1_input Local temperature (1/1000 degree, 39*4882a593Smuzhiyun 0.125 degree resolution) 40*4882a593Smuzhiyun 41*4882a593Smuzhiyuntemp[2-9]_input CPU temperatures (1/1000 degree, 42*4882a593Smuzhiyun 0.125 degree resolution) 43*4882a593Smuzhiyun 44*4882a593Smuzhiyunpwm[1-4]_enable R/W, 1/2 for manual or SmartFan mode 45*4882a593Smuzhiyun Setting SmartFan mode is supported only if it has been 46*4882a593Smuzhiyun previously configured by BIOS (or configuration EEPROM) 47*4882a593Smuzhiyun 48*4882a593Smuzhiyunpwm[1-4] R/O in SmartFan mode, R/W in manual control mode 49*4882a593Smuzhiyun======================= ======================================================= 50*4882a593Smuzhiyun 51*4882a593SmuzhiyunThe driver checks sensor control registers and does not export the sensors 52*4882a593Smuzhiyunthat are not enabled. Anyway, a sensor that is enabled may actually be not 53*4882a593Smuzhiyunconnected and thus provide zero readings. 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun 56*4882a593SmuzhiyunLimitations 57*4882a593Smuzhiyun----------- 58*4882a593Smuzhiyun 59*4882a593SmuzhiyunThe following features are not supported in current version: 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun - SmartFan control 62*4882a593Smuzhiyun - Watchdog 63*4882a593Smuzhiyun - GPIO 64*4882a593Smuzhiyun - external temperature sensors 65*4882a593Smuzhiyun - SMI 66*4882a593Smuzhiyun - min/max values 67*4882a593Smuzhiyun - many other... 68