evgpe.c

linux-2.6.15.6

 *              executed at interrupt level.
 *
 ******************************************************************************/

u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
{
	u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
	u8 enabled_status_byte;
	struct acpi_gpe_register_info *gpe_register_info;
	u32 status_reg;
	u32 enable_reg;
	u32 flags;
	acpi_status status;
	struct acpi_gpe_block_info *gpe_block;
	acpi_native_uint i;
	acpi_native_uint j;

	ACPI_FUNCTION_NAME("ev_gpe_detect");

	/* Check for the case where there are no GPEs */

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

	/* Examine all GPE blocks attached to this interrupt level */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	gpe_block = gpe_xrupt_list->gpe_block_list_head;
	while (gpe_block) {
		/*
		 * Read all of the 8-bit GPE status and enable registers
		 * in this GPE block, saving all of them.
		 * Find all currently active GP events.
		 */
		for (i = 0; i < gpe_block->register_count; i++) {
			/* Get the next status/enable pair */

			gpe_register_info = &gpe_block->register_info[i];

			/* Read the Status Register */

			status =
			    acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
						   &status_reg,
						   &gpe_register_info->
						   status_address);
			if (ACPI_FAILURE(status)) {
				goto unlock_and_exit;
			}

			/* Read the Enable Register */

			status =
			    acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
						   &enable_reg,
						   &gpe_register_info->
						   enable_address);
			if (ACPI_FAILURE(status)) {
				goto unlock_and_exit;
			}

			ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
					  "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
					  gpe_register_info->base_gpe_number,
					  status_reg, enable_reg));

			/* Check if there is anything active at all in this register */

			enabled_status_byte = (u8) (status_reg & enable_reg);
			if (!enabled_status_byte) {
				/* No active GPEs in this register, move on */

				continue;
			}

			/* Now look at the individual GPEs in this byte register */

			for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
				/* Examine one GPE bit */

				if (enabled_status_byte &
				    acpi_gbl_decode_to8bit[j]) {
					/*
					 * Found an active GPE. Dispatch the event to a handler
					 * or method.
					 */
					int_status |=
					    acpi_ev_gpe_dispatch(&gpe_block->
								 event_info[(i *
									     ACPI_GPE_REGISTER_WIDTH)
									    +
									    j],
								 (u32) j +
								 gpe_register_info->
								 base_gpe_number);
				}
			}
		}

		gpe_block = gpe_block->next;
	}

      unlock_and_exit:

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

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 *
 * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 *
 * RETURN:      None
 *
 * DESCRIPTION: Perform the actual execution of a GPE control method.  This
 *              function is called from an invocation of acpi_os_queue_for_execution
 *              (and therefore does NOT execute at interrupt level) so that
 *              the control method itself is not executed in the context of
 *              an interrupt handler.
 *
 ******************************************************************************/

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
{
	struct acpi_gpe_event_info *gpe_event_info = (void *)context;
	u32 gpe_number = 0;
	acpi_status status;
	struct acpi_gpe_event_info local_gpe_event_info;
	struct acpi_parameter_info info;

	ACPI_FUNCTION_TRACE("ev_asynch_execute_gpe_method");

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_VOID;
	}

	/* Must revalidate the gpe_number/gpe_block */

	if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
		status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
		return_VOID;
	}

	/* Set the GPE flags for return to enabled state */

	(void)acpi_ev_enable_gpe(gpe_event_info, FALSE);

	/*
	 * Take a snapshot of the GPE info for this level - we copy the
	 * info to prevent a race condition with remove_handler/remove_block.
	 */
	ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
		    sizeof(struct acpi_gpe_event_info));

	status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_VOID;
	}

	/*
	 * Must check for control method type dispatch one more
	 * time to avoid race with ev_gpe_install_handler
	 */
	if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
	    ACPI_GPE_DISPATCH_METHOD) {
		/*
		 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
		 * control method that corresponds to this GPE
		 */
		info.node = local_gpe_event_info.dispatch.method_node;
		info.parameters =
		    ACPI_CAST_PTR(union acpi_operand_object *, gpe_event_info);
		info.parameter_type = ACPI_PARAM_GPE;

		status = acpi_ns_evaluate_by_handle(&info);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_ERROR(("%s while evaluating method [%4.4s] for GPE[%2X]\n", acpi_format_exception(status), acpi_ut_get_node_name(local_gpe_event_info.dispatch.method_node), gpe_number));
		}
	}

	if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
	    ACPI_GPE_LEVEL_TRIGGERED) {
		/*
		 * GPE is level-triggered, we clear the GPE status bit after
		 * handling the event.
		 */
		status = acpi_hw_clear_gpe(&local_gpe_event_info);
		if (ACPI_FAILURE(status)) {
			return_VOID;
		}
	}

	/* Enable this GPE */

	(void)acpi_hw_write_gpe_enable_reg(&local_gpe_event_info);
	return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_gpe_dispatch
 *
 * PARAMETERS:  gpe_event_info  - Info for this GPE
 *              gpe_number      - Number relative to the parent GPE block
 *
 * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 *
 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 *              or method (e.g. _Lxx/_Exx) handler.
 *
 *              This function executes at interrupt level.
 *
 ******************************************************************************/

u32
acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("ev_gpe_dispatch");

	/*
	 * If edge-triggered, clear the GPE status bit now.  Note that
	 * level-triggered events are cleared after the GPE is serviced.
	 */
	if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
	    ACPI_GPE_EDGE_TRIGGERED) {
		status = acpi_hw_clear_gpe(gpe_event_info);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n", acpi_format_exception(status), gpe_number));
			return_VALUE(ACPI_INTERRUPT_NOT_HANDLED);
		}
	}

	/* Save current system state */

	if (acpi_gbl_system_awake_and_running) {
		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
	} else {
		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
	}

	/*
	 * Dispatch the GPE to either an installed handler, or the control
	 * method associated with this GPE (_Lxx or _Exx).
	 * If a handler exists, we invoke it and do not attempt to run the method.
	 * If there is neither a handler nor a method, we disable the level to
	 * prevent further events from coming in here.
	 */
	switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
	case ACPI_GPE_DISPATCH_HANDLER:

		/*
		 * Invoke the installed handler (at interrupt level)
		 * Ignore return status for now.  TBD: leave GPE disabled on error?
		 */
		(void)gpe_event_info->dispatch.handler->address(gpe_event_info->
								dispatch.
								handler->
								context);

		/* It is now safe to clear level-triggered events. */

		if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
		    ACPI_GPE_LEVEL_TRIGGERED) {
			status = acpi_hw_clear_gpe(gpe_event_info);
			if (ACPI_FAILURE(status)) {
				ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n", acpi_format_exception(status), gpe_number));
				return_VALUE(ACPI_INTERRUPT_NOT_HANDLED);
			}
		}
		break;

	case ACPI_GPE_DISPATCH_METHOD:

		/*
		 * Disable GPE, so it doesn't keep firing before the method has a
		 * chance to run.
		 */
		status = acpi_ev_disable_gpe(gpe_event_info);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n", acpi_format_exception(status), gpe_number));
			return_VALUE(ACPI_INTERRUPT_NOT_HANDLED);
		}

		/*
		 * Execute the method associated with the GPE
		 * NOTE: Level-triggered GPEs are cleared after the method completes.
		 */
		status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
						     acpi_ev_asynch_execute_gpe_method,
						     gpe_event_info);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to queue handler for GPE[%2X] - event disabled\n", acpi_format_exception(status), gpe_number));
		}
		break;

	default:

		/* No handler or method to run! */

		ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: No handler or method for GPE[%2X], disabling event\n", gpe_number));

		/*
		 * Disable the GPE.  The GPE will remain disabled until the ACPI
		 * Core Subsystem is restarted, or a handler is installed.
		 */
		status = acpi_ev_disable_gpe(gpe_event_info);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n", acpi_format_exception(status), gpe_number));
			return_VALUE(ACPI_INTERRUPT_NOT_HANDLED);
		}
		break;
	}

	return_VALUE(ACPI_INTERRUPT_HANDLED);
}

#ifdef ACPI_GPE_NOTIFY_CHECK
/*******************************************************************************
 * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
 *
 * FUNCTION:    acpi_ev_check_for_wake_only_gpe
 *
 * PARAMETERS:  gpe_event_info  - info for this GPE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Determine if a a GPE is "wake-only".
 *
 *              Called from Notify() code in interpreter when a "device_wake"
 *              Notify comes in.
 *
 ******************************************************************************/

acpi_status
acpi_ev_check_for_wake_only_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("ev_check_for_wake_only_gpe");

	if ((gpe_event_info) &&	/* Only >0 for _Lxx/_Exx */
	    ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) {	/* System state at GPE time */
		/* This must be a wake-only GPE, disable it */

		status = acpi_ev_disable_gpe(gpe_event_info);

		/* Set GPE to wake-only.  Do not change wake disabled/enabled status */

		acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);

		ACPI_REPORT_INFO(("GPE %p was updated from wake/run to wake-only\n", gpe_event_info));

		/* This was a wake-only GPE */

		return_ACPI_STATUS(AE_WAKE_ONLY_GPE);
	}

	return_ACPI_STATUS(AE_OK);
}
#endif