1 Kernel driver emc2103 1 Kernel driver emc2103
2 ====================== 2 ======================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * SMSC EMC2103 6 * SMSC EMC2103
7 7
8 Addresses scanned: I2C 0x2e 8 Addresses scanned: I2C 0x2e
9 9
10 Prefix: 'emc2103' 10 Prefix: 'emc2103'
11 11
12 Datasheet: Not public 12 Datasheet: Not public
13 13
14 Authors: 14 Authors:
15 Steve Glendinning <steve.glendinning@sm 15 Steve Glendinning <steve.glendinning@smsc.com>
16 16
17 Description 17 Description
18 ----------- 18 -----------
19 19
20 The Standard Microsystems Corporation (SMSC) E 20 The Standard Microsystems Corporation (SMSC) EMC2103 chips
21 contain up to 4 temperature sensors and a sing 21 contain up to 4 temperature sensors and a single fan controller.
22 22
23 Fan rotation speeds are reported in RPM (rotat 23 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
24 triggered if the rotation speed has dropped be 24 triggered if the rotation speed has dropped below a programmable limit. Fan
25 readings can be divided by a programmable divi 25 readings can be divided by a programmable divider (1, 2, 4 or 8) to give
26 the readings more range or accuracy. Not all R 26 the readings more range or accuracy. Not all RPM values can accurately be
27 represented, so some rounding is done. With a 27 represented, so some rounding is done. With a divider of 1, the lowest
28 representable value is 480 RPM. 28 representable value is 480 RPM.
29 29
30 This driver supports RPM based control, to use 30 This driver supports RPM based control, to use this a fan target
31 should be written to fan1_target and pwm1_enab 31 should be written to fan1_target and pwm1_enable should be set to 3.
32 32
33 The 2103-2 and 2103-4 variants have a third te 33 The 2103-2 and 2103-4 variants have a third temperature sensor, which can
34 be connected to two anti-parallel diodes. The 34 be connected to two anti-parallel diodes. These values can be read
35 as temp3 and temp4. If only one diode is atta 35 as temp3 and temp4. If only one diode is attached to this channel, temp4
36 will show as "fault". The module parameter "a 36 will show as "fault". The module parameter "apd=0" can be used to suppress
37 this 4th channel when anti-parallel diodes are 37 this 4th channel when anti-parallel diodes are not fitted.
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