power_manager: Add dbus method HandleGetTabletModeMethod()

Add dbus method HandleGetTabletModeMethod(), which returns powerd's
current TabletMode status. This will be used to add a tast test that
validates EC tabletmode notifications are received and processed by
powerd.

BUG=b:259134792
TEST=dbus-send --system --print-reply=literal --type=method_call \
--dest=org.chromium.PowerManager /org/chromium/PowerManager \
org.chromium.PowerManager.GetTabletMode
TEST=tast run <IP> power.TabletModeNotification

Cq-Depend: chromium:4026790
Change-Id: I2ea0e16272dddb23be27870899925121c25d7ebd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/4020834
Reviewed-by: Eric Caruso <ejcaruso@chromium.org>
Commit-Queue: Tim Van Patten <timvp@google.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: Tim Van Patten <timvp@google.com>
NOKEYCHECK=True
GitOrigin-RevId: addb864cd19558f7a37b428b72a4b969023ab7d5
1 file changed
tree: 54f2a7ae50550fd54f97b5e6edccd0f0cd8f96fc
  1. constants/
  2. dbus/
  3. mojo/
  4. src/
  5. switches/
  6. .gitignore
  7. BUILD.gn
  8. build.rs
  9. Cargo.toml
  10. DIR_METADATA
  11. LICENSE
  12. OWNERS
  13. README.md
  14. system_api.pc
README.md

This directory (platform2/system_api) contains constants and definitions like D-Bus service names that are shared between Chromium and Chromium OS.

This directory is only for things like headers and .proto files. No implementation should be added.

When writting a .proto file make sure to use:

option optimize_for = LITE_RUNTIME;

This will force usage of a lite protobuf instead of a full/heavy weight protobuf. The browser only links against the light version, so you will get cryptic link errors about missing parts of Message if you define a protobuf here and then try to use it in Chrome. Currently CrOS links against the full protobuffer library, but that might change in the future.

When declaring a protobuf, avoid use of required unless it is exactly what you mean. "Required is Forever" and very rarely should actually be used. Consult Protocol Buffer Basics: C++ for a detailed of this issue.