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HAL Interface Name

Overview

Describe the role of this HAL service. Outline its responsibilities, how it abstracts platform-specific functionality, and its interaction with higher-level RDK components. Mention any excluded modes or operations.


References

Info

Interface Definition path-to-aidl-version
API Documentation TBD
HAL Interface Type AIDL and Binder
Initialization Unit systemd service
VTS Tests TBD
Reference Implementation TBD


Functional Overview

Explain the main responsibilities of this interface, such as managing resources, processing buffers, handling events, or controlling hardware. Clarify its positioning in the system architecture.


Implementation Requirements

# Requirement Comments
HAL..1 The service shall... Notes or rationale

Interface Definitions

AIDL File Description
I.aidl Main resource control interface
IManager.aidl Interface for service discovery and resource enumeration
Capabilities.aidl Parcelable describing feature set
ErrorCode.aidl Enum of failure conditions

Initialization

Describe startup behaviour, service registration, dependencies, and order of operation (e.g., Service Manager registration).


Product Customization

Explain:

  • How resources are uniquely identified and enumerated
  • What Capabilities or properties clients can query
  • If the platform can offer multiple simultaneous instances

System Context

Include a Mermaid flowchart or textual description showing:

  • Client-side interface use
  • Resource control paths
  • Event listener connections
  • Any shared data buffer interaction

Resource Management

Detail the lifecycle:

  • How clients open() or acquire() resource handles
  • Restrictions (e.g., single controller vs. multiple listeners)
  • Cleanup behavior when a client exits

Operation and Data Flow

General description of:

  • How input/output flows through the HAL
  • Handling of any buffer queues, frame handles, or metadata
  • Conditions for back pressure or resource stalls

Modes of Operation

Describe configurable or runtime modes and how they affect client interaction or output.


Event Handling

Document:

  • Events emitted (e.g., onStateChanged, onError, onResourceAvailable)
  • Listener types
  • Timing guarantees or event ordering rules

State Machine / Lifecycle

Describe the typical session flow:

  • States like CLOSED, READY, STARTED, FLUSHING
  • Sequence diagrams or state transition tables
  • Expected order of calls and callbacks

Data Format / Protocol Support (if applicable)

Format Use Case Support Level
FormatX Application data Optional

Platform Capabilities

Outline expected feature support—parameter ranges, configuration values, or mode toggles exposed through PlatformCapabilities.


End-of-Stream and Error Handling

Explain how the interface handles:

  • Completion signals
  • Error propagation and recovery
  • Discontinuities or out-of-band resets

Open Issues / TODOs

Track:

  • Unspecified behaviour
  • Items pending AIDL changes or implementation
  • Gaps in validation/test coverage