mirror of https://gitee.com/openkylin/linux.git
68 lines
1.6 KiB
ReStructuredText
68 lines
1.6 KiB
ReStructuredText
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Kernel driver nct7904
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=====================
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Supported chip:
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* Nuvoton NCT7904D
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Prefix: nct7904
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Addresses: I2C 0x2d, 0x2e
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Datasheet: Publicly available at Nuvoton website
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http://www.nuvoton.com/
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Author: Vadim V. Vlasov <vvlasov@dev.rtsoft.ru>
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Description
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-----------
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The NCT7904D is a hardware monitor supporting up to 20 voltage sensors,
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internal temperature sensor, Intel PECI and AMD SB-TSI CPU temperature
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interface, up to 12 fan tachometer inputs, up to 4 fan control channels
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with SmartFan.
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Sysfs entries
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-------------
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Currently, the driver supports only the following features:
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======================= =======================================================
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in[1-20]_input Input voltage measurements (mV)
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fan[1-12]_input Fan tachometer measurements (rpm)
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temp1_input Local temperature (1/1000 degree,
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0.125 degree resolution)
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temp[2-9]_input CPU temperatures (1/1000 degree,
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0.125 degree resolution)
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pwm[1-4]_enable R/W, 1/2 for manual or SmartFan mode
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Setting SmartFan mode is supported only if it has been
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previously configured by BIOS (or configuration EEPROM)
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pwm[1-4] R/O in SmartFan mode, R/W in manual control mode
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======================= =======================================================
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The driver checks sensor control registers and does not export the sensors
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that are not enabled. Anyway, a sensor that is enabled may actually be not
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connected and thus provide zero readings.
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Limitations
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-----------
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The following features are not supported in current version:
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- SmartFan control
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- Watchdog
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- GPIO
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- external temperature sensors
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- SMI
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- min/max values
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- many other...
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