[Backlight] Use ceiling rather than truncation in driver.

Match Fuchsia driver values to CastOS'.

Bug: b/178251082
Fixed: b/178251082
Test: Logging shows identical low brightness values
Test: fx test ti-lp8556-test
Test: fx test brightness_manager_test
Change-Id: If1219208d6c31a66c3bef90f6b9962b1fbb3d1dc
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/474819
Reviewed-by: Ernest Holmes <ernestholmes@google.com>
Reviewed-by: Adam Barth <abarth@google.com>
Commit-Queue: Kevin Twidle <kpt@google.com>
(cherry picked from commit 7d514f30322ed7149074d2db2443f9c81fd28e61)
2 files changed
tree: 9e141b4b70bd564f22cc8fba752c4550ec8c8f8f
  1. boards/
  2. build/
  3. buildtools/
  4. bundles/
  5. docs/
  6. examples/
  7. garnet/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. third_party/
  13. tools/
  14. zircon/
  15. .clang-format
  16. .clang-tidy
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. README.md
  30. rustfmt.toml
README.md

Fuchsia

Pink + Purple == Fuchsia (a new operating system)

What is Fuchsia?

Fuchsia is a modular, capability-based operating system. Fuchsia runs on modern 64-bit Intel and ARM processors.

Fuchsia is an open source project with a code of conduct that we expect everyone who interacts with the project to respect.

Read more about Fuchsia's principles.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See fuchsia.dev.