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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
This commit is contained in:
Alper Nebi Yasak 2022-08-18 17:27:22 +03:00
parent cd7ad0cbde
commit e2f25ae648
3 changed files with 22 additions and 1 deletions
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3
hwdb.d/60-sensor.hwdb
View file

@ -4,10 +4,13 @@
# 60-sensor.rules
#
# 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

15
hwdb.d/parse_hwdb.py
View file

@ -72,7 +72,20 @@ TYPES = {'mouse': ('usb', 'bluetooth', 'ps2', '*'),
'touchpad': ('i8042', 'rmi', 'bluetooth', 'usb'),
'joystick': ('i8042', 'rmi', 'bluetooth', 'usb'),
'keyboard': ('name', ),
'sensor': ('modalias', ),
'sensor': ('modalias',
'accel-base',
'accel-display',
'accel-camera',
'proximity-palmrest',
'proximity-palmrest-left',
'proximity-palmrest-right',
'proximity-lap',
'proximity-wifi',
'proximity-lte',
'proximity-wifi-lte',
'proximity-wifi-left',
'proximity-wifi-right',
),
'ieee1394-unit-function' : ('node', ),
'camera': ('usb'),
}

5
rules.d/60-sensor.rules
View file

@ -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}'", \