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author | Jean Delvare <khali@linux-fr.org> | 2006-12-12 18:18:29 +0100 |
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committer | Jean Delvare <khali@arrakis.delvare> | 2006-12-12 18:18:29 +0100 |
commit | ba224e2c4f0a706714ccb483b0c21d32f5994f67 (patch) | |
tree | 572d75a19909ec69a3298135a1646dceffbc584f /Documentation/hwmon/pc87427 | |
parent | 8e9afcbbdef71aeeb510732f4f8d5ac3de863df0 (diff) | |
download | linux-stable-ba224e2c4f0a706714ccb483b0c21d32f5994f67.tar.gz linux-stable-ba224e2c4f0a706714ccb483b0c21d32f5994f67.tar.bz2 linux-stable-ba224e2c4f0a706714ccb483b0c21d32f5994f67.zip |
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 <khali@linux-fr.org>
Diffstat (limited to 'Documentation/hwmon/pc87427')
-rw-r--r-- | Documentation/hwmon/pc87427 | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/hwmon/pc87427 b/Documentation/hwmon/pc87427 new file mode 100644 index 000000000000..9a0708f9f49e --- /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 <khali@linux-fr.org> + +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). |