Based on kernel version 3.9. Page generated on 2013-05-02 23:08 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/media/Downloads_Public/Data_Sheets/47b272.pdf 11 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf 12 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf 13 http://www.smsc.com/ 14 * SMSC LPC47M292 15 Addresses scanned: none, address read from Super I/O config space 16 Prefix: 'smsc47m2' 17 Datasheet: Not public 18 * SMSC LPC47M997 19 Addresses scanned: none, address read from Super I/O config space 20 Prefix: 'smsc47m1' 21 Datasheet: none 22 23 Authors: 24 Mark D. Studebaker <firstname.lastname@example.org>, 25 With assistance from Bruce Allen <email@example.com>, and his 26 fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/ 27 Gabriele Gorla <firstname.lastname@example.org>, 28 Jean Delvare <email@example.com> 29 30 Description 31 ----------- 32 33 The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips 34 contain monitoring and PWM control circuitry for two fans. 35 36 The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware 37 monitoring block' in addition to the fan monitoring and control. The 38 hardware monitoring block is not supported by this driver, use the 39 smsc47m192 driver for that. 40 41 No documentation is available for the 47M997, but it has the same device 42 ID as the 47M15x and 47M192 chips and seems to be compatible. 43 44 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is 45 triggered if the rotation speed has dropped below a programmable limit. Fan 46 readings can be divided by a programmable divider (1, 2, 4 or 8) to give 47 the readings more range or accuracy. Not all RPM values can accurately be 48 represented, so some rounding is done. With a divider of 2, the lowest 49 representable value is around 2600 RPM. 50 51 PWM values are from 0 to 255. 52 53 If an alarm triggers, it will remain triggered until the hardware register 54 is read at least once. This means that the cause for the alarm may 55 already have disappeared! Note that in the current implementation, all 56 hardware registers are read whenever any data is read (unless it is less 57 than 1.5 seconds since the last update). This means that you can easily 58 miss once-only alarms. 59 60 61 ********************** 62 The lm_sensors project gratefully acknowledges the support of 63 Intel in the development of this driver.