1Kernel driver smsc47m1 2====================== 3 4Supported chips: 5 * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x, 6 LPC47M15x and LPC47M192 7 Addresses scanned: none, address read from Super I/O config space 8 Prefix: 'smsc47m1' 9 Datasheets: 10 http://www.smsc.com/main/datasheets/47b27x.pdf 11 http://www.smsc.com/main/datasheets/47m10x.pdf 12 http://www.smsc.com/main/datasheets/47m112.pdf 13 http://www.smsc.com/main/tools/discontinued/47m13x.pdf 14 http://www.smsc.com/main/datasheets/47m14x.pdf 15 http://www.smsc.com/main/tools/discontinued/47m15x.pdf 16 http://www.smsc.com/main/datasheets/47m192.pdf 17 * SMSC LPC47M292 18 Addresses scanned: none, address read from Super I/O config space 19 Prefix: 'smsc47m2' 20 Datasheet: Not public 21 * SMSC LPC47M997 22 Addresses scanned: none, address read from Super I/O config space 23 Prefix: 'smsc47m1' 24 Datasheet: none 25 26Authors: 27 Mark D. Studebaker <mdsxyz123@yahoo.com>, 28 With assistance from Bruce Allen <ballen@uwm.edu>, and his 29 fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/ 30 Gabriele Gorla <gorlik@yahoo.com>, 31 Jean Delvare <khali@linux-fr.org> 32 33Description 34----------- 35 36The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips 37contain monitoring and PWM control circuitry for two fans. 38 39The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware 40monitoring block' in addition to the fan monitoring and control. The 41hardware monitoring block is not supported by this driver, use the 42smsc47m192 driver for that. 43 44No documentation is available for the 47M997, but it has the same device 45ID as the 47M15x and 47M192 chips and seems to be compatible. 46 47Fan rotation speeds are reported in RPM (rotations per minute). An alarm is 48triggered if the rotation speed has dropped below a programmable limit. Fan 49readings can be divided by a programmable divider (1, 2, 4 or 8) to give 50the readings more range or accuracy. Not all RPM values can accurately be 51represented, so some rounding is done. With a divider of 2, the lowest 52representable value is around 2600 RPM. 53 54PWM values are from 0 to 255. 55 56If an alarm triggers, it will remain triggered until the hardware register 57is read at least once. This means that the cause for the alarm may 58already have disappeared! Note that in the current implementation, all 59hardware registers are read whenever any data is read (unless it is less 60than 1.5 seconds since the last update). This means that you can easily 61miss once-only alarms. 62 63 64********************** 65The lm_sensors project gratefully acknowledges the support of 66Intel in the development of this driver. 67