Based on kernel version 2.6.26. Page generated on 2008-07-16 21:12 EST.
1 Kernel driver smsc47m1 2 ====================== 3 4 Supported 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 26 Authors: 27 Mark D. Studebaker <mdsxyz123[AT]yahoo[DOT]com>, 28 With assistance from Bruce Allen <ballen[AT]uwm[DOT]edu>, and his 29 fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/ 30 Gabriele Gorla <gorlik[AT]yahoo[DOT]com>, 31 Jean Delvare <khali[AT]linux-fr[DOT]org> 32 33 Description 34 ----------- 35 36 The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips 37 contain monitoring and PWM control circuitry for two fans. 38 39 The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware 40 monitoring block' in addition to the fan monitoring and control. The 41 hardware monitoring block is not supported by this driver, use the 42 smsc47m192 driver for that. 43 44 No documentation is available for the 47M997, but it has the same device 45 ID as the 47M15x and 47M192 chips and seems to be compatible. 46 47 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is 48 triggered if the rotation speed has dropped below a programmable limit. Fan 49 readings can be divided by a programmable divider (1, 2, 4 or 8) to give 50 the readings more range or accuracy. Not all RPM values can accurately be 51 represented, so some rounding is done. With a divider of 2, the lowest 52 representable value is around 2600 RPM. 53 54 PWM values are from 0 to 255. 55 56 If an alarm triggers, it will remain triggered until the hardware register 57 is read at least once. This means that the cause for the alarm may 58 already have disappeared! Note that in the current implementation, all 59 hardware registers are read whenever any data is read (unless it is less 60 than 1.5 seconds since the last update). This means that you can easily 61 miss once-only alarms. 62 63 64 ********************** 65 The lm_sensors project gratefully acknowledges the support of 66 Intel in the development of this driver.