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chromium / chromiumos / platform2 / libmems / 4a131b0fd118d59c2fb3924cc0ece73653f86302
commit4a131b0fd118d59c2fb3924cc0ece73653f86302[log] [tgz]
authorHarvey Yang <chenghaoyang@google.com>Tue Apr 11 09:15:03 2023
committerCopybara-Service <copybara-worker@google.com>Fri May 05 08:35:25 2023
tree56cadd695cfe78ffe1dd01235485d645b181c844
parent7e1fa7f2ab7c42703a06e33120b938cac130e691 [diff]
libmems: Omit channel number in iio_event_impl if there's only one

In the format of `in_[chan_type][channel]_[event_type]_[direction]_en`,
`[channel]` will be omitted if there's only one channel.

Ref:
https://source.corp.google.com/chromeos_public/src/third_party/kernel/v6.1/include/linux/iio/iio.h;rcl=b22bc4d6072e74b768c4c19e2ff3585ba5927904;l=232

BUG=b:272655176
TEST=unit tests

Change-Id: If4cb1dba0a5b1b8b98c925c34e866fcdbe803310
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/4413814
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Auto-Submit: Cheng-Hao Yang <chenghaoyang@chromium.org>
Commit-Queue: Cheng-Hao Yang <chenghaoyang@chromium.org>
Tested-by: Cheng-Hao Yang <chenghaoyang@chromium.org>
NOKEYCHECK=True
GitOrigin-RevId: 90565d4e88549f8dbd1c9813e749ddf012fe691c
3 files changed
tree: 56cadd695cfe78ffe1dd01235485d645b181c844
  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_impl_test.cc
  23. iio_event_test.cc
  24. libmems.pc
  25. libmems_test_support.pc
  26. OWNERS
  27. README.md
  28. test_fakes.cc
  29. 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.