linux-kernel - [PATCH v4 0/1] hwmon: (sht3x) read out sensor serial number

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Message-ID: <20240131111512.25321-1-code@stefan-gloor.ch>
Date: Wed, 31 Jan 2024 12:15:11 +0100
From: Stefan Gloor <code@...fan-gloor.ch>
To: jdelvare@...e.com,
	linux@...ck-us.net,
	corbet@....net,
	linux-hwmon@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Stefan Gloor <code@...fan-gloor.ch>
Subject: [PATCH v4 0/1] hwmon: (sht3x) read out sensor serial number

The temperature/humidity sensors of the STS3x/SHT3x family are
calibrated and factory-programmed with a unique serial number.
For some sensors, this serial number can be used to obtain a calibration
certificate via an API provided by the manufacturer (Sensirion).
Expose the serial number via debugfs.

A "sht3x" debugfs directory is created when loading the driver.
Within this parent directory, another directory is created for each
sensor instantiation which contains the serial number.
The sensor-specific directories are managed by devres, such that
they are cleaned up upon deinstantation or if hwmon registration fails.
The top-level directory is removed when the driver is unloaded.

Changelog
=========

v3 -> v4:
	- Remove debugfs entry with devm_add_action_or_reset()

v2 -> v3:
	- Remove #ifdef for debugfs
	- Add debugfs cleanup
	- Do not expose serial number if read fails

v1 -> v2:
	- Change from sysfs to debugfs
	- Add documentation improvements

Stefan Gloor (1):
  hwmon: (sht3x) read out sensor serial number

 Documentation/hwmon/sht3x.rst | 11 ++++++
 drivers/hwmon/sht3x.c         | 66 ++++++++++++++++++++++++++++++++++-
 2 files changed, 76 insertions(+), 1 deletion(-)

-- 
2.41.0