Summary:
Add support for the HID type cover input devices on the Pro 8 and all
requirements for that.
Blurb from v1:
This series adds support for the type cover of the Surface Pro 8. On
the Pro 8, the type cover is (unlike on previous generations) handled
via the Surface System Aggregator Module (SSAM). As the type cover is
detachable, care needs to be taken and the respective SSAM (HID)
client devices need to be properly removed when detached and
re-initialized when attached.
Therefore, this series does three things:
1. Improve hot-removal support for SSAM client devices. When
hot-removing clients, subsequent communication may time out.
In the worst case, this can lead to problems when devices are
detached and re-attached quickly, before we can remove their
respective kernel representations. This can then lead to devices
being in an uninitialized state, preventing, for example, touchpad
gestures from working properly as the required HID feature report
has not been sent.
Therefore, handle hot-removal of devices more gracefully by
avoiding communication once it has been detected and ensure that
devices are actually removed.
2. Generify SSAM subsystem hubs and add a KIP hub. On the Surface Pro
8, the KIP subsystem (only that abbreviation is known) is
responsible for managing type-cover devices. This hub acts as the
controller for device removal similar to the BAS (detachable base)
subsystem hub on the Surface Book 3 (therefore we can share most
of the code between them).
3. Add the (HID) type-cover clients of the Surface Pro 8 to the
aggregator registry.
Changes in v2:
- Introduce "platform/surface: aggregator: Allow is_ssam_device() to be
used when CONFIG_SURFACE_AGGREGATOR_BUS is disabled" to fix an
undefined reference build issue when CONFIG_SURFACE_AGGREGATOR_BUS
is disabled.
- Make SSAM hub device UIDs consistent.
- Introduce "platform/surface: aggregator_registry: Change device ID
for base hub" to make association between hub and subsystem target
category more obvious.
- Change hub device ID for KIP subsystem hub to be consistent with
the id of the already existing BAS hub.
Maximilian Luz (12):
platform/surface: aggregator: Allow is_ssam_device() to be used when
CONFIG_SURFACE_AGGREGATOR_BUS is disabled
platform/surface: aggregator: Allow devices to be marked as
hot-removed
platform/surface: aggregator: Allow notifiers to avoid communication
on unregistering
platform/surface: aggregator_registry: Use client device wrappers for
notifier registration
power/supply: surface_charger: Use client device wrappers for notifier
registration
power/supply: surface_battery: Use client device wrappers for notifier
registration
HID: surface-hid: Add support for hot-removal
platform/surface: aggregator: Add comment for KIP subsystem category
platform/surface: aggregator_registry: Generify subsystem hub
functionality
platform/surface: aggregator_registry: Change device ID for base hub
platform/surface: aggregator_registry: Add KIP device hub
platform/surface: aggregator_registry: Add support for keyboard cover
on Surface Pro 8
.../driver-api/surface_aggregator/client.rst | 6 +-
drivers/hid/surface-hid/surface_hid_core.c | 38 +-
.../platform/surface/aggregator/controller.c | 53 ++-
.../surface/surface_aggregator_registry.c | 403 +++++++++++++-----
drivers/power/supply/surface_battery.c | 4 +-
drivers/power/supply/surface_charger.c | 4 +-
include/linux/surface_aggregator/controller.h | 24 +-
include/linux/surface_aggregator/device.h | 125 +++++-
include/linux/surface_aggregator/serial_hub.h | 2 +-
9 files changed, 513 insertions(+), 146 deletions(-)
--
2.36.1
