drivers/acpi/acpica/hwesleep.c

Source file repositories/reference/linux-study-clean/drivers/acpi/acpica/hwesleep.c

File Facts

System
Linux kernel
Corpus path
drivers/acpi/acpica/hwesleep.c
Extension
.c
Size
5878 bytes
Lines
205
Domain
Driver Families
Bucket
drivers/acpi
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

	} while (!(((u8)sleep_status) & ACPI_X_WAKE_STATUS));

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_hw_extended_wake_prep
 *
 * PARAMETERS:  sleep_state         - Which sleep state we just exited
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform first part of OS-independent ACPI cleanup after
 *              a sleep. Called with interrupts ENABLED.
 *
 ******************************************************************************/

acpi_status acpi_hw_extended_wake_prep(u8 sleep_state)
{
	u8 sleep_type_value;

	ACPI_FUNCTION_TRACE(hw_extended_wake_prep);

	if (acpi_gbl_sleep_type_a_s0 != ACPI_SLEEP_TYPE_INVALID) {
		sleep_type_value =
		    ((acpi_gbl_sleep_type_a_s0 << ACPI_X_SLEEP_TYPE_POSITION) &
		     ACPI_X_SLEEP_TYPE_MASK);

		(void)acpi_write((u64)(sleep_type_value | ACPI_X_SLEEP_ENABLE),
				 &acpi_gbl_FADT.sleep_control);
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_hw_extended_wake
 *
 * PARAMETERS:  sleep_state         - Which sleep state we just exited
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 *              Called with interrupts ENABLED.
 *
 ******************************************************************************/

acpi_status acpi_hw_extended_wake(u8 sleep_state)
{
	ACPI_FUNCTION_TRACE(hw_extended_wake);

	/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */

	acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;

	/* Execute the wake methods */

	acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING);
	acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state);

	/*
	 * Some BIOS code assumes that WAK_STS will be cleared on resume
	 * and use it to determine whether the system is rebooting or
	 * resuming. Clear WAK_STS for compatibility.
	 */
	(void)acpi_write((u64)ACPI_X_WAKE_STATUS, &acpi_gbl_FADT.sleep_status);
	acpi_gbl_system_awake_and_running = TRUE;

	acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
	return_ACPI_STATUS(AE_OK);
}

Annotation

Implementation Notes