0001 Kernel driver smsc47m1
0002 ======================
0003
0004 Supported chips:
0005
0006 * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x,
0007
0008 LPC47M15x and LPC47M192
0009
0010 Addresses scanned: none, address read from Super I/O config space
0011
0012 Prefix: 'smsc47m1'
0013
0014 Datasheets:
0015
0016 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf
0017
0018 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf
0019
0020 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf
0021
0022 http://www.smsc.com/
0023
0024 * SMSC LPC47M292
0025
0026 Addresses scanned: none, address read from Super I/O config space
0027
0028 Prefix: 'smsc47m2'
0029
0030 Datasheet: Not public
0031
0032 * SMSC LPC47M997
0033
0034 Addresses scanned: none, address read from Super I/O config space
0035
0036 Prefix: 'smsc47m1'
0037
0038 Datasheet: none
0039
0040
0041
0042 Authors:
0043
0044 - Mark D. Studebaker <mdsxyz123@yahoo.com>,
0045 - With assistance from Bruce Allen <ballen@uwm.edu>, and his
0046 fan.c program:
0047
0048 - http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/
0049
0050 - Gabriele Gorla <gorlik@yahoo.com>,
0051 - Jean Delvare <jdelvare@suse.de>
0052
0053 Description
0054 -----------
0055
0056 The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
0057 contain monitoring and PWM control circuitry for two fans.
0058
0059 The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
0060 monitoring block' in addition to the fan monitoring and control. The
0061 hardware monitoring block is not supported by this driver, use the
0062 smsc47m192 driver for that.
0063
0064 No documentation is available for the 47M997, but it has the same device
0065 ID as the 47M15x and 47M192 chips and seems to be compatible.
0066
0067 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
0068 triggered if the rotation speed has dropped below a programmable limit. Fan
0069 readings can be divided by a programmable divider (1, 2, 4 or 8) to give
0070 the readings more range or accuracy. Not all RPM values can accurately be
0071 represented, so some rounding is done. With a divider of 2, the lowest
0072 representable value is around 2600 RPM.
0073
0074 PWM values are from 0 to 255.
0075
0076 If an alarm triggers, it will remain triggered until the hardware register
0077 is read at least once. This means that the cause for the alarm may
0078 already have disappeared! Note that in the current implementation, all
0079 hardware registers are read whenever any data is read (unless it is less
0080 than 1.5 seconds since the last update). This means that you can easily
0081 miss once-only alarms.
0082
0083 ------------------------------------------------------------------
0084
0085 The lm_sensors project gratefully acknowledges the support of
0086 Intel in the development of this driver.
