1 Kernel driver emc2103 2 ====================== 3 4 Supported chips: 5 6 * SMSC EMC2103 7 8 Addresses scanned: I2C 0x2e 9 10 Prefix: 'emc2103' 11 12 Datasheet: Not public 13 14 Authors: 15 Steve Glendinning <steve.glendinning@smsc.com> 16 17 Description 18 ----------- 19 20 The Standard Microsystems Corporation (SMSC) EMC2103 chips 21 contain up to 4 temperature sensors and a single fan controller. 22 23 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is 24 triggered if the rotation speed has dropped below a programmable limit. Fan 25 readings can be divided by a programmable divider (1, 2, 4 or 8) to give 26 the readings more range or accuracy. Not all RPM values can accurately be 27 represented, so some rounding is done. With a divider of 1, the lowest 28 representable value is 480 RPM. 29 30 This driver supports RPM based control, to use this a fan target 31 should be written to fan1_target and pwm1_enable should be set to 3. 32 33 The 2103-2 and 2103-4 variants have a third temperature sensor, which can 34 be connected to two anti-parallel diodes. These values can be read 35 as temp3 and temp4. If only one diode is attached to this channel, temp4 36 will show as "fault". The module parameter "apd=0" can be used to suppress 37 this 4th channel when anti-parallel diodes are not fitted.
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