Module ec 

Embedded Controller (EC) driver for x86.

Provides direct access to the ACPI Embedded Controller via I/O ports 0x62 (data) and 0x66 (command/status). Used for temperature reading, fan control, and battery management on laptops (ThinkPad X13, etc.).

Reference: ACPI Embedded Controller Interface Specification 1.0a

Constants

EC_CMD_QUERY 🔒

EC_CMD_READ 🔒

EC commands.

EC_CMD_WRITE 🔒

EC_DATA_PORT 🔒

EC data port (read/write data bytes).

EC_SC_PORT 🔒

EC command/status port (write commands, read status).

EC_STATUS_IBF 🔒

EC_STATUS_OBF 🔒

EC status register bits.

EC_STATUS_SCI 🔒

EC_TIMEOUT 🔒

Maximum number of retries when waiting for EC to become ready.

Statics

EC_AVAILABLE 🔒

Whether the EC was detected and initialized successfully.

EC_LOCK 🔒

Serialize all EC access to prevent interleaved command/data sequences.

Functions

ec_query 🔒 ^⚠

Query the EC for a pending event. Returns the event byte (Query ID).

ec_read_byte 🔒 ^⚠

Read a single byte from an EC register.

ec_wait_ibf 🔒

Wait for the EC input buffer to be empty (ready to accept a write).

ec_wait_obf 🔒

Wait for the EC output buffer to become full (data available to read).

ec_write_byte 🔒 ^⚠

Write a single byte to an EC register.

has_sci_event

Check if there is a pending SCI event in the EC.

init

Detect and initialize the Embedded Controller.

is_available

Returns whether the EC was detected.

query_event

Query a pending EC event (SCI). Returns the query byte.

read

Read a byte from an EC register.

write

Write a byte to an EC register.