feat: Battery service implementation + tests (all 15 opcodes)#57
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Pull request overview
Implements a stateful Battery service for the QEMU secure partition and wires up opcode dispatch + unit tests to cover the supported battery protocol commands.
Changes:
- Replace the prior generic response stub with typed responses and a stateful
Batterystruct. - Implement and dispatch handlers for the battery opcode set (BIX/BST/PSR/PIF/BPS/BTP/BPT/BPC/BMC/BMD/BCT/BTM/BMS/BMA/STA).
- Add unit tests covering opcode responses and basic BTP/BMC persistence behavior.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
platform/qemu-sp/src/battery.rs |
Adds stateful battery fields, opcode handlers, payload response types, and a comprehensive test suite. |
.husky/pre-commit |
Tightens clippy to deny warnings and runs cargo test explicitly against the host target. |
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cargo test without --target fails locally when rust-toolchain.toml installs aarch64-unknown-none-softfloat, because no_std-incompatible transitive deps (futures-timer, slab) are resolved for that target. Using the host target from rustc -vV ensures portability across Linux, macOS, and Windows.
- Battery struct with all IHV1 ec_memory fields and realistic defaults - BixRsp (11-field), PsrRsp, PifRsp, StaRsp, ValueRsp response structs - Bidirectional DirectMessagePayload conversion for all response types - Manual Default impl delegating to new() (thermal pattern) - BST now reads from struct state fields instead of hardcoded literals - Existing BstRsp and GenericRsp unchanged
- All 15 match arms dispatch to real methods (zero generic_test refs) - get_bix returns BixRsp with 11 fields from Battery state - get_bst reads from struct fields (not hardcoded literals) - get_psr/get_pif/get_sta use dedicated response structs - handle_btp/handle_bmc support set-then-get via payload u32_at(4) - 10 get-only opcodes use ValueRsp reading from Battery state - Removed GenericRsp and generic_test (dead code) - cargo clippy -D warnings clean, cargo fmt clean - Existing battery_get_bst_works test passes
- Add bat_req/bat_req_with_value test helper functions - Add test_get_bix: verify all 11 BIX response fields from defaults - Add test_get_bst_from_state: verify BST reads struct state - Add tests for PSR, PIF, BPS, BTP default, BPT, BPC, BMC default - Add tests for BMD, BCT, BTM, BMS, BMA, STA - 16 tests total (1 existing + 15 new), all passing
- Add test_btp_set_get_round_trip: set value then get verifies persistence - Add test_bmc_set_get_round_trip: set 0x42 then get verifies persistence - Add test_btp_set_overwrites_previous: last set wins (50 then 75) - Add test_unknown_command_returns_error: 0xFF returns Err - 20 total battery tests passing, clippy and fmt clean
Addresses code review WR-01: BTP and BMC handlers used != 0 guard on the set value, making it impossible to reset trip_thres or bmc_data to zero. Now uses a separate flag byte at offset 8 to indicate a set operation, allowing zero as a valid value (e.g., ACPI _BTP=0 disables trip point). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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philgweber
reviewed
Apr 15, 2026
philgweber
previously approved these changes
Apr 15, 2026
kurtjd
previously approved these changes
Apr 15, 2026
dymk
dismissed stale reviews from kurtjd and philgweber
The merge-base changed after approval.
philgweber
previously approved these changes
Apr 15, 2026
dymk
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philgweber’s stale review
The merge-base changed after approval.
kurtjd
previously approved these changes
Apr 15, 2026
This was referenced Apr 16, 2026
rogurr
previously approved these changes
Apr 16, 2026
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Summary
Implement all 15 battery opcodes (BTP, BMC, BST, BIX, etc.) with stateful
Battery struct. Adds 20+ unit tests covering all opcodes, edge cases, and
the BTP/BMC zero-value write fix.
Changes
platform/qemu-sp/src/battery.rs: Battery struct with state tracking, all 15 opcode handlers, comprehensive test moduleOpcodes Implemented
BTP, BMC, BST, BIX, BPC, BPS, BCT, BCV, BAR, BAT_DIS, BAT_STA, BAT_PSR, BAT_SOC, BAT_CYC, BAT_FCC
Key Design Decisions
set_flagbyte mechanism for BTP/BMC to distinguish 'set to zero' from 'no update'