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chromium / chromiumos / platform2 / libmems / 02eae65fca3e59dba406dcd8e41a883f1557ec4b
commit02eae65fca3e59dba406dcd8e41a883f1557ec4b[log] [tgz]
authorHarvey Yang <chenghaoyang@chromium.org>Wed Dec 08 03:05:56 2021
committerCopybara-Service <copybara-worker@google.com>Tue Mar 22 14:27:08 2022
tree41f71be015aabb82c9cc3180606b5aced4946f8e
parente0ceaaed23141e95a5ae0710b1f123fc0a4132b3 [diff]
libmems: Add iio event support

Adds iio event support in libmems with fake classes.

BUG=b:176431550
TEST=none

Change-Id: I72d3a0e44b6d719996d8ea680b4739318481e9ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/3322433
Tested-by: Cheng-Hao Yang <chenghaoyang@chromium.org>
Auto-Submit: Cheng-Hao Yang <chenghaoyang@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Commit-Queue: Cheng-Hao Yang <chenghaoyang@chromium.org>
NOKEYCHECK=True
GitOrigin-RevId: 8f2b3ecab9bacc26ac3d0b0a19f07ddd8ae67337
16 files changed
tree: 41f71be015aabb82c9cc3180606b5aced4946f8e
  1. BUILD.gn
  2. common_types.cc
  3. common_types.h
  4. export.h
  5. iio_channel.h
  6. iio_channel_impl.cc
  7. iio_channel_impl.h
  8. iio_context.h
  9. iio_context_impl.cc
  10. iio_context_impl.h
  11. iio_device.cc
  12. iio_device.h
  13. iio_device_impl.cc
  14. iio_device_impl.h
  15. iio_device_test.cc
  16. iio_device_trigger_impl.cc
  17. iio_device_trigger_impl.h
  18. iio_event.cc
  19. iio_event.h
  20. iio_event_impl.cc
  21. iio_event_impl.h
  22. iio_event_test.cc
  23. libmems.pc
  24. libmems_test_support.pc
  25. OWNERS
  26. README.md
  27. test_fakes.cc
  28. test_fakes.h
README.md

Chrome OS IIO Sensor Utility Library

Project goal and motivation

This library provides a set of wrapper and test helpers around libiio.

It is meant to provide a common foundation for Chrome OS to access and interface IIO sensors, with:

  • a strong emphasis on testability;
  • readable code, with the ergonomics typical of platform2;
  • high performance.

Class hierarchy

At the root of the hierarchy, there exists the IioContext, which represents the IIO devices currently available on the system. These can be retrieved by name and inspected, via instances of IioDevice.

An IioDevice allows reading and writing attributes of an IIO device via type-safe helper APIs. It also offers support for configuring the buffer and trigger of an IIO device, which we use in order to allow the Chrome UI to read accelerometer data and support screen rotation.

An IioDevice also exposes a list of IioChannels, which can individually be enabled and disabled.

Test mocks

Useful mocks for the core classes are provided, such that a test author can focus on the logic of the unit tests and share a common testing language with other engineers working in this space. Sharing the foundation of testing IIO sensor access helps ensure that any improvement in this area can benefit all clients.