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1Kernel driver emc21032======================3 4Supported chips:5 6 * SMSC EMC21037 8 Addresses scanned: I2C 0x2e9 10 Prefix: 'emc2103'11 12 Datasheet: Not public13 14Authors:15 Steve Glendinning <steve.glendinning@smsc.com>16 17Description18-----------19 20The Standard Microsystems Corporation (SMSC) EMC2103 chips21contain up to 4 temperature sensors and a single fan controller.22 23Fan rotation speeds are reported in RPM (rotations per minute). An alarm is24triggered if the rotation speed has dropped below a programmable limit. Fan25readings can be divided by a programmable divider (1, 2, 4 or 8) to give26the readings more range or accuracy. Not all RPM values can accurately be27represented, so some rounding is done. With a divider of 1, the lowest28representable value is 480 RPM.29 30This driver supports RPM based control, to use this a fan target31should be written to fan1_target and pwm1_enable should be set to 3.32 33The 2103-2 and 2103-4 variants have a third temperature sensor, which can34be connected to two anti-parallel diodes. These values can be read35as temp3 and temp4. If only one diode is attached to this channel, temp436will show as "fault". The module parameter "apd=0" can be used to suppress37this 4th channel when anti-parallel diodes are not fitted.38