From ba224e2c4f0a706714ccb483b0c21d32f5994f67 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Tue, 12 Dec 2006 18:18:29 +0100 Subject: hwmon: New PC87427 hardware monitoring driver This is a new hardware monitoring driver for the National Semiconductor PC87427 Super-I/O chip. It only supports fan speed monitoring for now, while the chip can do much more. Thanks to Amir Habibi at Candelis for setting up a test system, and to Michael Kress for testing several iterations of this driver. Signed-off-by: Jean Delvare --- Documentation/hwmon/pc87427 | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/hwmon/pc87427 (limited to 'Documentation/hwmon') diff --git a/Documentation/hwmon/pc87427 b/Documentation/hwmon/pc87427 new file mode 100644 index 00000000000..9a0708f9f49 --- /dev/null +++ b/Documentation/hwmon/pc87427 @@ -0,0 +1,38 @@ +Kernel driver pc87427 +===================== + +Supported chips: + * National Semiconductor PC87427 + Prefix: 'pc87427' + Addresses scanned: none, address read from Super I/O config space + Datasheet: http://www.winbond.com.tw/E-WINBONDHTM/partner/apc_007.html + +Author: Jean Delvare + +Thanks to Amir Habibi at Candelis for setting up a test system, and to +Michael Kress for testing several iterations of this driver. + + +Description +----------- + +The National Semiconductor Super I/O chip includes complete hardware +monitoring capabilities. It can monitor up to 18 voltages, 8 fans and +6 temperature sensors. Only the fans are supported at the moment. + +This chip also has fan controlling features, which are not yet supported +by this driver either. + +The driver assumes that no more than one chip is present, which seems +reasonable. + + +Fan Monitoring +-------------- + +Fan rotation speeds are reported as 14-bit values from a gated clock +signal. Speeds down to 83 RPM can be measured. + +An alarm is triggered if the rotation speed drops below a programmable +limit. Another alarm is triggered if the speed is too low to to be measured +(including stalled or missing fan). -- cgit v1.2.3