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The nct7802 chip exposes two registers that allow setting the time interval between successive duty increases or decreases in Smart Fan mode. The units are intervals of 0.1 second. The default value at power on is 10, so 1 second. Add sysfs attributes for step_up_time and step_down_time to allow controlling the responsiveness of the fan speed. Values are represented as milliseconds to the user. When set, the value is clamped to the valid range of 100 to 25500 (0.1 to 25.5 seconds), and rounded to the nearest multiple of 100. Signed-off-by: Ronan Dalton <ronan.dalton@alliedtelesis.co.nz> Cc: linux-kernel@vger.kernel.org Cc: linux-hwmon@vger.kernel.org Cc: Guenter Roeck <linux@roeck-us.net> Cc: Chris Packham <chris.packham@alliedtelesis.co.nz> Link: https://lore.kernel.org/r/20260514003404.1548747-2-ronan.dalton@alliedtelesis.co.nz Signed-off-by: Guenter Roeck <linux@roeck-us.net>
55 lines
1.5 KiB
ReStructuredText
55 lines
1.5 KiB
ReStructuredText
Kernel driver nct7802
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=====================
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Supported chips:
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* Nuvoton NCT7802Y
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Prefix: 'nct7802'
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Addresses scanned: I2C 0x28..0x2f
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Datasheet: Available from Nuvoton web site
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Authors:
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Guenter Roeck <linux@roeck-us.net>
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Description
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-----------
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This driver implements support for the Nuvoton NCT7802Y hardware monitoring
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chip. NCT7802Y supports 6 temperature sensors, 5 voltage sensors, and 3 fan
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speed sensors.
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Smart Fan™ speed control is available via pwmX_auto_point attributes.
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Sysfs Attributes
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----------------
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Sysfs attributes unique to this chip are documented below. For common
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attributes, see Documentation/hwmon/sysfs-interface.rst.
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step_up_time
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Time interval between successive duty cycle increases
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when in Smart Fan mode. Specified in milliseconds and
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rounded to intervals of 100 in the range 100-25500.
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step_down_time
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Time interval between successive duty cycle decreases
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when in Smart Fan mode. Specified in milliseconds and
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rounded to intervals of 100 in the range 100-25500.
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Tested Boards and BIOS Versions
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-------------------------------
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The driver has been reported to work with the following boards and
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BIOS versions.
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======================= ===============================================
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Board BIOS version
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======================= ===============================================
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Kontron COMe-bSC2 CHR2E934.001.GGO
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Kontron COMe-bIP2 CCR2E212
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======================= ===============================================
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