The cros-ec-accel devices report their mounting location by the 'label'
sysfs file only since Linux v6.0. With earlier kernels, a nonstandard
'location' file reports this, but slightly differently (lid instead of
display) [1].
Add udev rules to import the correct hwdb entries based on this
'location' file for cros-ec-accel devices, so that the base-mounted
accel matrix has the correct value for older kernels as well.
[1] https://kernel.org/doc/Documentation/ABI/testing/sysfs-bus-iio-cros-ec
systemd-commit ac3c031e3862e3d74e64b108e0bafcaefa71c792
Author: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Date: Thu Aug 18 19:56:13 2022 +0300
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
Merge up to commit 5674b74c4f99e433fd8e7242e9f16f6ddfece94c
- change @bindir@ to {{ROOTBINDIR}} in templates (better future tracking)
- keep rules/50-udev-default.rules as plain instead of template
- add
60-autosuspend.rules
60-fido-id.rules
70-camera.rules
70-memory.rules
81-net-dhcp.rules
This commit adds a rules file to extract the properties from hwdb
to set on i2c IIO devices. This is used to set the ACCEL_MOUNT_MATRIX
property on IIO devices, to be consumed by iio-sensor-proxy or
equivalent daemon.
The hwdb file contains documentation on how to write quirks. Note
however that mount information is usually exported in:
- the device-tree for ARM devices
- the ACPI DSDT for Intel-compatible devices
but currently not extracted by the kernel.
Also note that some devices have the framebuffer rotation that changes
between the bootloader and the main system, which might mean that the
accelerometer is then wrongly oriented. This is a missing feature in the
i915 kernel driver: https://bugs.freedesktop.org/show_bug.cgi?id=94894
which needs to be fixed, and won't require quirks.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
