| 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. |
