9df7305b5a
SMSC's EMC2103 family of temperature/fan controllers have 1 onboard and up to 3 external temperature sensors, and allow closed-loop control of one fan. This patch adds support for them. Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
34 lines
1.2 KiB
Plaintext
34 lines
1.2 KiB
Plaintext
Kernel driver emc2103
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======================
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Supported chips:
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* SMSC EMC2103
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Addresses scanned: I2C 0x2e
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Prefix: 'emc2103'
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Datasheet: Not public
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Authors:
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Steve Glendinning <steve.glendinning@smsc.com>
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Description
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-----------
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The Standard Microsystems Corporation (SMSC) EMC2103 chips
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contain up to 4 temperature sensors and a single fan controller.
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Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
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triggered if the rotation speed has dropped below a programmable limit. Fan
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readings can be divided by a programmable divider (1, 2, 4 or 8) to give
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the readings more range or accuracy. Not all RPM values can accurately be
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represented, so some rounding is done. With a divider of 1, the lowest
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representable value is 480 RPM.
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This driver supports RPM based control, to use this a fan target
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should be written to fan1_target and pwm1_enable should be set to 3.
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The 2103-2 and 2103-4 variants have a third temperature sensor, which can
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be connected to two anti-parallel diodes. These values can be read
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as temp3 and temp4. If only one diode is attached to this channel, temp4
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will show as "fault". The module parameter "apd=0" can be used to suppress
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this 4th channel when anti-parallel diodes are not fitted.
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