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udev: hwdb: Match iio sensors based on their label

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The IIO subsystem exposes a 'label' sysfs file to help userspace better
identify its devices [1]. Standardized labels include the sensor type
along with its location, including 'accel-base' and 'accel-display'.

Most Chrome OS boards have two accelerometers that are indistinguishable
except for this label (or a 'location' sysfs file before Linux v6.0),
and need different mounting matrix corrections based on their location.

Add a udev rule that matches hwdb entries using this label, so we can
correct both accelerometers on these devices with hwdb entries. The
existing rules and hwdb entries are not modified to keep potential
out-of-tree entries working, but new entries in this form will override
existing ones. Also add currently standardized labels to parse-hwdb.py.

[1] https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-bus-iio

systemd-commit e2f25ae64889ea7fe8a7556ee5fba91bc2a0eab8
Author: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Date:   Thu Aug 18 17:27:22 2022 +0300
This commit is contained in:
Boian Bonev 2022-09-22 01:17:17 +03:00
parent ba2cff9c54
commit fa741e87a8
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GPG Key ID: 1365720913D2F22D
2 changed files with 8 additions and 0 deletions
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3
hwdb/60-sensor.hwdb
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@ -9,10 +9,13 @@
# ABI.
#
# Match string formats:
# sensor:<label>:modalias:<parent modalias pattern>:dmi:<dmi pattern>
# sensor:modalias:<parent modalias pattern>:dmi:<dmi pattern>
#
# The device modalias can be seen in the `modalias` file of the sensor parent,
# and the device label can be seen in the `label` file of the sensor,
# for example:
# cat /sys/`udevadm info -q path -n /dev/iio:device0`/label
# cat /sys/`udevadm info -q path -n /dev/iio:device0`/../modalias
#
# The full DMI string of the running machine can be read from

5
rules/60-sensor.rules
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@ -2,6 +2,11 @@
ACTION=="remove", GOTO="sensor_end"
# device matching the sensor's label, name and the machine's DMI data for IIO devices
SUBSYSTEM=="iio", KERNEL=="iio*", SUBSYSTEMS=="usb|i2c|platform", ATTR{label}!="", \
IMPORT{builtin}="hwdb 'sensor:$attr{label}:modalias:$attr{modalias}:$attr{[dmi/id]modalias}'", \
GOTO="sensor_end"
# device matching the sensor's name and the machine's DMI data for IIO devices
SUBSYSTEM=="iio", KERNEL=="iio*", SUBSYSTEMS=="usb|i2c|platform", \
IMPORT{builtin}="hwdb 'sensor:modalias:$attr{modalias}:$attr{[dmi/id]modalias}'", \