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authorVadim V. Vlasov <vvlasov@dev.rtsoft.ru>2015-02-27 16:16:00 +0300
committerGuenter Roeck <linux@roeck-us.net>2015-03-09 09:59:36 -0700
commit9c947d25c96ec93485d60f7b783403d518c1418d (patch)
tree8d87bbe5f0d1a327f23f37b5e08316d50360a8ff /Documentation/hwmon
parente8433b42b60e799d55eb2476dc6cb3668c740063 (diff)
downloadkernel-9c947d25c96ec93485d60f7b783403d518c1418d.tar.gz
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')
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diff --git a/Documentation/hwmon/nct7904 b/Documentation/hwmon/nct7904
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+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...