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hwmon: Add update_interval_us chip attribute

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Some hardware monitoring chips support update intervals below one
millisecond. The existing update_interval attribute uses millisecond
granularity, which causes sub-millisecond steps to round to the same
value and become inaccessible from userspace.

Introduce update_interval_us, a companion chip-level attribute that
expresses the same update interval in microseconds. Drivers
implementing this attribute should also implement update_interval for
compatibility with millisecond-based userspace interfaces.

Signed-off-by: Ferdinand Schwenk <ferdinand.schwenk@advastore.com>
Link: https://lore.kernel.org/r/20260609-hwmon-ina238-update-interval-us-v2-v3-2-016b55567950@advastore.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Ferdinand Schwenk 2026-06-09 21:43:11 +02:00 committed by Guenter Roeck
parent 1f7a5cfe44
commit 8250814145
4 changed files with 21 additions and 0 deletions
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14
Documentation/ABI/testing/sysfs-class-hwmon
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@ -27,6 +27,20 @@ Description:
Some devices have a variable update rate or interval.
This attribute can be used to change it to the desired value.
What: /sys/class/hwmon/hwmonX/update_interval_us
Description:
The interval at which the chip will update readings,
expressed in microseconds.
Unit: microsecond
RW
Some devices have a variable update rate or interval and
require finer-than-millisecond control.
This attribute can be used to change it to the desired value.
Drivers implementing this attribute should also implement
update_interval for millisecond-based userspace interfaces.
What: /sys/class/hwmon/hwmonX/inY_min
Description:
Voltage min value.

4
Documentation/hwmon/sysfs-interface.rst
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@ -106,6 +106,10 @@ Global attributes
`update_interval`
The interval at which the chip will update readings.
`update_interval_us`
The interval at which the chip will update readings,
expressed in microseconds for finer resolution.
********
Voltages

1
drivers/hwmon/hwmon.c
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@ -573,6 +573,7 @@ static const char * const hwmon_chip_attrs[] = {
[hwmon_chip_curr_reset_history] = "curr_reset_history",
[hwmon_chip_power_reset_history] = "power_reset_history",
[hwmon_chip_update_interval] = "update_interval",
[hwmon_chip_update_interval_us] = "update_interval_us",
[hwmon_chip_alarms] = "alarms",
[hwmon_chip_samples] = "samples",
[hwmon_chip_curr_samples] = "curr_samples",

2
include/linux/hwmon.h
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@ -40,6 +40,7 @@ enum hwmon_chip_attributes {
hwmon_chip_power_reset_history,
hwmon_chip_register_tz,
hwmon_chip_update_interval,
hwmon_chip_update_interval_us,
hwmon_chip_alarms,
hwmon_chip_samples,
hwmon_chip_curr_samples,
@ -56,6 +57,7 @@ enum hwmon_chip_attributes {
#define HWMON_C_POWER_RESET_HISTORY BIT(hwmon_chip_power_reset_history)
#define HWMON_C_REGISTER_TZ BIT(hwmon_chip_register_tz)
#define HWMON_C_UPDATE_INTERVAL BIT(hwmon_chip_update_interval)
#define HWMON_C_UPDATE_INTERVAL_US BIT(hwmon_chip_update_interval_us)
#define HWMON_C_ALARMS BIT(hwmon_chip_alarms)
#define HWMON_C_SAMPLES BIT(hwmon_chip_samples)
#define HWMON_C_CURR_SAMPLES BIT(hwmon_chip_curr_samples)