diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-14 14:57:58 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-14 14:57:58 -0700 |
commit | d310ad0c9d6354affc8abdcfb189ae1a434f18ae (patch) | |
tree | b4daa9dc377e30087b6433a6ab95cc9ef0768528 /Documentation/hwmon/pc87427 | |
parent | c29c08b59875fe053471cf9eb66f8cfef39bc509 (diff) | |
parent | f279941863f0d39fa8285b84449b52b8286a254b (diff) |
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: (22 commits)
hwmon: (via-cputemp) Remove bogus "SHOW" global variable
hwmon: jc42 depends on I2C
hwmon: (pc87427) Add a maintainer
hwmon: (pc87427) Move sysfs file removal to a separate function
hwmon: (pc87427) Add temperature monitoring support
hwmon: (pc87427) Add support for the second logical device
hwmon: (pc87427) Add support for manual fan speed control
hwmon: (pc87427) Minor style cleanups
hwmon: (pc87427) Handle disabled fan inputs properly
hwmon: (w83627ehf) Add support for W83667HG-B
hwmon: (w83627ehf) Driver cleanup
hwmon: Add driver for SMSC EMC2103 temperature monitor and fan controller
hwmon: Remove in[0-*]_fault from sysfs-interface
hwmon: Add 4 current alarm/beep attributes to sysfs-interface
hwmon: Add 3 critical limit attributes to sysfs-interface
hwmon: (asc7621) Clean up and improve detect function
hwmon: (it87) Export labels for internal sensors
hwmon: (lm75) Add suspend/resume feature
hwmon: (emc1403) Add power support
hwmon: (ltc4245) Expose all GPIO pins as analog voltages
...
Diffstat (limited to 'Documentation/hwmon/pc87427')
-rw-r--r-- | Documentation/hwmon/pc87427 | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/Documentation/hwmon/pc87427 b/Documentation/hwmon/pc87427 index db5cc1227a83..8fdd08c9e48b 100644 --- a/Documentation/hwmon/pc87427 +++ b/Documentation/hwmon/pc87427 @@ -18,10 +18,11 @@ 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. +6 temperature sensors. Only the fans and temperatures are supported at +the moment, voltages aren't. -This chip also has fan controlling features, which are not yet supported -by this driver either. +This chip also has fan controlling features (up to 4 PWM outputs), +which are partly supported by this driver. The driver assumes that no more than one chip is present, which seems reasonable. @@ -36,3 +37,23 @@ 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 be measured (including stalled or missing fan). + + +Fan Speed Control +----------------- + +Fan speed can be controlled by PWM outputs. There are 4 possible modes: +always off, always on, manual and automatic. The latter isn't supported +by the driver: you can only return to that mode if it was the original +setting, and the configuration interface is missing. + + +Temperature Monitoring +---------------------- + +The PC87427 relies on external sensors (following the SensorPath +standard), so the resolution and range depend on the type of sensor +connected. The integer part can be 8-bit or 9-bit, and can be signed or +not. I couldn't find a way to figure out the external sensor data +temperature format, so user-space adjustment (typically by a factor 2) +may be required. |