1Kernel driver smsc47m1 2====================== 3 4Supported chips: 5 6 * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x, 7 8 LPC47M15x and LPC47M192 9 10 Addresses scanned: none, address read from Super I/O config space 11 12 Prefix: 'smsc47m1' 13 14 Datasheets: 15 16 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf 17 18 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf 19 20 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf 21 22 http://www.smsc.com/ 23 24 * SMSC LPC47M292 25 26 Addresses scanned: none, address read from Super I/O config space 27 28 Prefix: 'smsc47m2' 29 30 Datasheet: Not public 31 32 * SMSC LPC47M997 33 34 Addresses scanned: none, address read from Super I/O config space 35 36 Prefix: 'smsc47m1' 37 38 Datasheet: none 39 40 41 42Authors: 43 44 - Mark D. Studebaker <mdsxyz123@yahoo.com>, 45 - With assistance from Bruce Allen <ballen@uwm.edu>, and his 46 fan.c program: 47 48 - http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/ 49 50 - Gabriele Gorla <gorlik@yahoo.com>, 51 - Jean Delvare <jdelvare@suse.de> 52 53Description 54----------- 55 56The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips 57contain monitoring and PWM control circuitry for two fans. 58 59The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware 60monitoring block' in addition to the fan monitoring and control. The 61hardware monitoring block is not supported by this driver, use the 62smsc47m192 driver for that. 63 64No documentation is available for the 47M997, but it has the same device 65ID as the 47M15x and 47M192 chips and seems to be compatible. 66 67Fan rotation speeds are reported in RPM (rotations per minute). An alarm is 68triggered if the rotation speed has dropped below a programmable limit. Fan 69readings can be divided by a programmable divider (1, 2, 4 or 8) to give 70the readings more range or accuracy. Not all RPM values can accurately be 71represented, so some rounding is done. With a divider of 2, the lowest 72representable value is around 2600 RPM. 73 74PWM values are from 0 to 255. 75 76If an alarm triggers, it will remain triggered until the hardware register 77is read at least once. This means that the cause for the alarm may 78already have disappeared! Note that in the current implementation, all 79hardware registers are read whenever any data is read (unless it is less 80than 1.5 seconds since the last update). This means that you can easily 81miss once-only alarms. 82 83------------------------------------------------------------------ 84 85The lm_sensors project gratefully acknowledges the support of 86Intel in the development of this driver. 87