Hi All,
Some 360 degree hinges (yoga) style 2-in-1 devices use 2 bmc150 accels
to allow the OS to determine the angle between the display and the base
of the device, so that the OS can determine if the 2-in-1 is in laptop
or in tablet-mode.
We already support this setup on devices using a single ACPI node
with a HID of "BOSC0200" to describe both accelerometers. This patch
set extends this support to also support the same setup but then
using a HID of "DUAL250E".
While testing this I found some crashes on rmmod, patches 1-2
fix those patches, patch 3 does some refactoring and patch 4
adds support for the "DUAL250E" HID.
Unfortunately we need some more special handling though, which the
rest of the patches are for.
On Windows both accelerometers are read (polled) by a special service
and this service calls a DSM (Device Specific Method), which in turn
translates the angles to one of laptop/tablet/tent/stand mode and then
notifies the EC about the new mode and the EC then enables or disables
the builtin keyboard and touchpad based in the mode.
When the 2-in-1 is powered-on or resumed folded in tablet mode the
EC senses this independent of the DSM by using a HALL effect sensor
which senses that the keyboard has been folded away behind the display.
At power-on or resume the EC disables the keyboard based on this and
the only way to get the keyboard to work after this is to call the
DSM to re-enable it (similar to how we also need to call a special
DSM in the kxcjk-1013.c accel driver to re-enable the keyboard).
Patches 5-7 deal with the DSM mess and patch 8 adds labels to the
2 accelerometers specifying which one is which.
Regards,
Hans
Hans de Goede (8):
iio: accel: bmc150: Fix dereferencing the wrong pointer in
bmc150_get/set_second_device
iio: accel: bmc150: Don't make the remove function of the second
accelerometer unregister itself
iio: accel: bmc150: Move check for second ACPI device into a separate
function
iio: accel: bmc150: Add support for dual-accelerometers with a
DUAL250E HID
iio: accel: bmc150: Move struct bmc150_accel_data definition to
bmc150-accel.h
iio: accel: bmc150: Remove bmc150_set/get_second_device() accessor
functions
iio: accel: bmc150: Add support for DUAL250E ACPI DSM for setting the
hinge angle
iio: accel: bmc150: Set label based on accel-location for ACPI
DUAL250E fwnodes
drivers/iio/accel/bmc150-accel-core.c | 87 ++----------
drivers/iio/accel/bmc150-accel-i2c.c | 192 +++++++++++++++++++++-----
drivers/iio/accel/bmc150-accel.h | 66 ++++++++-
3 files changed, 239 insertions(+), 106 deletions(-)
--
2.31.1
