drivers/acpi/acpica/evsci.c

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

File Facts

System
Linux kernel
Corpus path
drivers/acpi/acpica/evsci.c
Extension
.c
Size
6068 bytes
Lines
215
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

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
 *
 * Module Name: evsci - System Control Interrupt configuration and
 *                      legacy to ACPI mode state transition functions
 *
 ******************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evsci")
#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/* Local prototypes */
static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_sci_dispatch
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status code indicates whether interrupt was handled.
 *
 * DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
 *
 ******************************************************************************/

u32 acpi_ev_sci_dispatch(void)
{
	struct acpi_sci_handler_info *sci_handler;
	acpi_cpu_flags flags;
	u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;

	ACPI_FUNCTION_NAME(ev_sci_dispatch);

	/* Are there any host-installed SCI handlers? */

	if (!acpi_gbl_sci_handler_list) {
		return (int_status);
	}

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Invoke all host-installed SCI handlers */

	sci_handler = acpi_gbl_sci_handler_list;
	while (sci_handler) {

		/* Invoke the installed handler (at interrupt level) */

		int_status |= sci_handler->address(sci_handler->context);

		sci_handler = sci_handler->next;
	}

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return (int_status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_sci_xrupt_handler
 *
 * PARAMETERS:  context   - Calling Context
 *
 * RETURN:      Status code indicates whether interrupt was handled.
 *
 * DESCRIPTION: Interrupt handler that will figure out what function or
 *              control method to call to deal with a SCI.
 *
 ******************************************************************************/

static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
{
	struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
	u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;

	ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);

	/*
	 * We are guaranteed by the ACPICA initialization/shutdown code that
	 * if this interrupt handler is installed, ACPI is enabled.
	 */

	/*
	 * Fixed Events:
	 * Check for and dispatch any Fixed Events that have occurred

Annotation

Implementation Notes