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bf08749a6a
The adm1177 driver exposes the current alert threshold through
hwmon_curr_max_alarm. This violates the hwmon sysfs ABI, where
*_alarm attributes are read-only status flags and writable thresholds
must use currN_max.
The driver also stores the threshold internally in microamps, while
currN_max is defined in milliamps. Convert the threshold accordingly
on both the read and write paths.
Widen the cached threshold and related calculations to 64 bits so
that small shunt resistor values do not cause truncation or overflow.
Also use 64-bit arithmetic for the mA/uA conversions, clamp writes
to the range the hardware can represent, and propagate failures from
adm1177_write_alert_thr() instead of silently ignoring them.
Update the hwmon documentation to reflect the attribute rename and
the correct units returned by the driver.
Fixes: 09b08ac9e8 ("hwmon: (adm1177) Add ADM1177 Hot Swap Controller and Digital Power Monitor driver")
Signed-off-by: Sanman Pradhan <psanman@juniper.net>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20260325051246.28262-1-sanman.pradhan@hpe.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
37 lines
906 B
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37 lines
906 B
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Kernel driver adm1177
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=====================
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Supported chips:
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* Analog Devices ADM1177
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Prefix: 'adm1177'
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Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADM1177.pdf
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Author: Beniamin Bia <beniamin.bia@analog.com>
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Description
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-----------
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This driver supports hardware monitoring for Analog Devices ADM1177
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Hot-Swap Controller and Digital Power Monitors with Soft Start Pin.
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Usage Notes
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-----------
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This driver does not auto-detect devices. You will have to instantiate the
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devices explicitly. Please see Documentation/i2c/instantiating-devices.rst
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for details.
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Sysfs entries
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-------------
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The following attributes are supported. Current maximum attribute
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is read-write, all other attributes are read-only.
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in0_input Measured voltage in millivolts.
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curr1_input Measured current in milliamperes.
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curr1_max Overcurrent shutdown threshold in milliamperes.
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