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- Kernel driver emc2103
- ======================
- Supported chips:
- * SMSC EMC2103
- Addresses scanned: I2C 0x2e
- Prefix: 'emc2103'
- Datasheet: Not public
- Authors:
- Steve Glendinning <steve.glendinning@smsc.com>
- Description
- -----------
- The Standard Microsystems Corporation (SMSC) EMC2103 chips
- contain up to 4 temperature sensors and a single fan controller.
- 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 1, the lowest
- representable value is 480 RPM.
- This driver supports RPM based control, to use this a fan target
- should be written to fan1_target and pwm1_enable should be set to 3.
- The 2103-2 and 2103-4 variants have a third temperature sensor, which can
- be connected to two anti-parallel diodes. These values can be read
- as temp3 and temp4. If only one diode is attached to this channel, temp4
- will show as "fault". The module parameter "apd=0" can be used to suppress
- this 4th channel when anti-parallel diodes are not fitted.
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