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| author | Vadim V. Vlasov <vvlasov@dev.rtsoft.ru> | 2015-02-27 16:16:00 +0300 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2015-03-09 09:59:36 -0700 |
| commit | 9c947d25c96ec93485d60f7b783403d518c1418d (patch) | |
| tree | 8d87bbe5f0d1a327f23f37b5e08316d50360a8ff /Documentation/hwmon/nct7904 | |
| parent | e8433b42b60e799d55eb2476dc6cb3668c740063 (diff) | |
| download | lwn-9c947d25c96ec93485d60f7b783403d518c1418d.tar.gz lwn-9c947d25c96ec93485d60f7b783403d518c1418d.zip | |
hwmon: Add Nuvoton NCT7904 hwmon driver
The NCT7904D is a hardware monitor supporting up to 20 voltage sensors,
internal temperature sensor, Intel PECI and AMD SB-TSI CPU temperature
interface, up to 12 fan tachometer inputs, up to 4 fan control channels
with SmartFan.
Signed-off-by: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>
[Guenter Roeck: Fixed whitespace errors, dropped redundant comment]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon/nct7904')
| -rw-r--r-- | Documentation/hwmon/nct7904 | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/Documentation/hwmon/nct7904 b/Documentation/hwmon/nct7904 new file mode 100644 index 000000000000..014f112e2a14 --- /dev/null +++ b/Documentation/hwmon/nct7904 @@ -0,0 +1,60 @@ +Kernel driver nct7904 +==================== + +Supported chip: + * Nuvoton NCT7904D + Prefix: nct7904 + Addresses: I2C 0x2d, 0x2e + Datasheet: Publicly available at Nuvoton website + http://www.nuvoton.com/ + +Author: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru> + + +Description +----------- + +The NCT7904D is a hardware monitor supporting up to 20 voltage sensors, +internal temperature sensor, Intel PECI and AMD SB-TSI CPU temperature +interface, up to 12 fan tachometer inputs, up to 4 fan control channels +with SmartFan. + + +Sysfs entries +------------- + +Currently, the driver supports only the following features: + +in[1-20]_input Input voltage measurements (mV) + +fan[1-12]_input Fan tachometer measurements (rpm) + +temp1_input Local temperature (1/1000 degree, + 0.125 degree resolution) + +temp[2-9]_input CPU temperatures (1/1000 degree, + 0.125 degree resolution) + +fan[1-4]_mode R/W, 0/1 for manual or SmartFan mode + Setting SmartFan mode is supported only if it has been + previously configured by BIOS (or configuration EEPROM) + +fan[1-4]_pwm R/O in SmartFan mode, R/W in manual control mode + +The driver checks sensor control registers and does not export the sensors +that are not enabled. Anyway, a sensor that is enabled may actually be not +connected and thus provide zero readings. + + +Limitations +----------- + +The following features are not supported in current version: + + - SmartFan control + - Watchdog + - GPIO + - external temperature sensors + - SMI + - min/max values + - many other... |