| Kernel driver smsc47m1 | |
| ====================== | |
| Supported chips: | |
| * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x, | |
| LPC47M15x and LPC47M192 | |
| Addresses scanned: none, address read from Super I/O config space | |
| Prefix: 'smsc47m1' | |
| Datasheets: | |
| http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf | |
| http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf | |
| http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf | |
| http://www.smsc.com/ | |
| * SMSC LPC47M292 | |
| Addresses scanned: none, address read from Super I/O config space | |
| Prefix: 'smsc47m2' | |
| Datasheet: Not public | |
| * SMSC LPC47M997 | |
| Addresses scanned: none, address read from Super I/O config space | |
| Prefix: 'smsc47m1' | |
| Datasheet: none | |
| Authors: | |
| - Mark D. Studebaker <mdsxyz123@yahoo.com>, | |
| - With assistance from Bruce Allen <ballen@uwm.edu>, and his | |
| fan.c program: | |
| - http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/ | |
| - Gabriele Gorla <gorlik@yahoo.com>, | |
| - Jean Delvare <jdelvare@suse.de> | |
| Description | |
| ----------- | |
| The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips | |
| contain monitoring and PWM control circuitry for two fans. | |
| The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware | |
| monitoring block' in addition to the fan monitoring and control. The | |
| hardware monitoring block is not supported by this driver, use the | |
| smsc47m192 driver for that. | |
| No documentation is available for the 47M997, but it has the same device | |
| ID as the 47M15x and 47M192 chips and seems to be compatible. | |
| Fan rotation speeds are reported in RPM (rotations per minute). An alarm is | |
| triggered if the rotation speed has dropped below a programmable limit. Fan | |
| readings can be divided by a programmable divider (1, 2, 4 or 8) to give | |
| the readings more range or accuracy. Not all RPM values can accurately be | |
| represented, so some rounding is done. With a divider of 2, the lowest | |
| representable value is around 2600 RPM. | |
| PWM values are from 0 to 255. | |
| If an alarm triggers, it will remain triggered until the hardware register | |
| is read at least once. This means that the cause for the alarm may | |
| already have disappeared! Note that in the current implementation, all | |
| hardware registers are read whenever any data is read (unless it is less | |
| than 1.5 seconds since the last update). This means that you can easily | |
| miss once-only alarms. | |
| ------------------------------------------------------------------ | |
| The lm_sensors project gratefully acknowledges the support of | |
| Intel in the development of this driver. |