path: root/Documentation/hwmon/emc2103
diff options
Diffstat (limited to 'Documentation/hwmon/emc2103')
1 files changed, 33 insertions, 0 deletions
diff --git a/Documentation/hwmon/emc2103 b/Documentation/hwmon/emc2103
new file mode 100644
index 00000000..a12b2c12
--- /dev/null
+++ b/Documentation/hwmon/emc2103
@@ -0,0 +1,33 @@
+Kernel driver emc2103
+Supported chips:
+ * SMSC EMC2103
+ Addresses scanned: I2C 0x2e
+ Prefix: 'emc2103'
+ Datasheet: Not public
+ Steve Glendinning <steve.glendinning@smsc.com>
+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.