| 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. |