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chromium / chromiumos / platform2 / libmems / b5ec656d59857799b3cf17583e5ecb414afac0d0
commitb5ec656d59857799b3cf17583e5ecb414afac0d0[log] [tgz]
authorGwendal Grignou <gwendal@chromium.org>Thu Nov 02 16:47:51 2023
committerCopybara-Service <copybara-worker@google.com>Mon Dec 04 09:37:27 2023
treeaebc95070304a2914d360ca8cecb08c208c823c5
parentc6b395f9818c82504728767475cbb70846f23f06 [diff]
libmems: Mark libmems_test_support as test library

Following
https://chromium.googlesource.com/chromiumos/docs/+/HEAD/testing/unit_tests.md#exclude-unit-test-files-from-the-os-image
Install the test library in /build/lib.

BUG=b:285404429, b:306363846
TEST=CQ

Change-Id: I06121c1aa5943ee0174b46053565c4a4dd64095f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/5001701
Commit-Queue: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
NOKEYCHECK=True
GitOrigin-RevId: 4012366a8bf755727f15e1ea80093d71ff126532
1 file changed
tree: aebc95070304a2914d360ca8cecb08c208c823c5
  1. BUILD.gn
  2. common_types.cc
  3. common_types.h
  4. DIR_METADATA
  5. export.h
  6. iio_channel.h
  7. iio_channel_impl.cc
  8. iio_channel_impl.h
  9. iio_context.h
  10. iio_context_impl.cc
  11. iio_context_impl.h
  12. iio_device.cc
  13. iio_device.h
  14. iio_device_impl.cc
  15. iio_device_impl.h
  16. iio_device_test.cc
  17. iio_device_trigger_impl.cc
  18. iio_device_trigger_impl.h
  19. iio_event.cc
  20. iio_event.h
  21. iio_event_impl.cc
  22. iio_event_impl.h
  23. iio_event_impl_test.cc
  24. iio_event_test.cc
  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.