evgpe.c

linux-2.6.15.6

/******************************************************************************
 *
 * Module Name: evgpe - General Purpose Event handling and dispatch
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/acevents.h>
#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evgpe")

/* Local prototypes */
static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_set_gpe_type
 *
 * PARAMETERS:  gpe_event_info          - GPE to set
 *              Type                    - New type
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
 *
 ******************************************************************************/

acpi_status
acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("ev_set_gpe_type");

	/* Validate type and update register enable masks */

	switch (type) {
	case ACPI_GPE_TYPE_WAKE:
	case ACPI_GPE_TYPE_RUNTIME:
	case ACPI_GPE_TYPE_WAKE_RUN:
		break;

	default:
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Disable the GPE if currently enabled */

	status = acpi_ev_disable_gpe(gpe_event_info);

	/* Type was validated above */

	gpe_event_info->flags &= ~ACPI_GPE_TYPE_MASK;	/* Clear type bits */
	gpe_event_info->flags |= type;	/* Insert type */
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_update_gpe_enable_masks
 *
 * PARAMETERS:  gpe_event_info          - GPE to update
 *              Type                    - What to do: ACPI_GPE_DISABLE or
 *                                        ACPI_GPE_ENABLE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Updates GPE register enable masks based on the GPE type
 *
 ******************************************************************************/

acpi_status
acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
				u8 type)
{
	struct acpi_gpe_register_info *gpe_register_info;
	u8 register_bit;

	ACPI_FUNCTION_TRACE("ev_update_gpe_enable_masks");

	gpe_register_info = gpe_event_info->register_info;
	if (!gpe_register_info) {
		return_ACPI_STATUS(AE_NOT_EXIST);
	}
	register_bit = gpe_event_info->register_bit;

	/* 1) Disable case.  Simply clear all enable bits */

	if (type == ACPI_GPE_DISABLE) {
		ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
			       register_bit);
		ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
		return_ACPI_STATUS(AE_OK);
	}

	/* 2) Enable case.  Set/Clear the appropriate enable bits */

	switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
	case ACPI_GPE_TYPE_WAKE:
		ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
		ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
		break;

	case ACPI_GPE_TYPE_RUNTIME:
		ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
			       register_bit);
		ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
		break;

	case ACPI_GPE_TYPE_WAKE_RUN:
		ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
		ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
		break;

	default:
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_enable_gpe
 *
 * PARAMETERS:  gpe_event_info          - GPE to enable
 *              write_to_hardware       - Enable now, or just mark data structs
 *                                        (WAKE GPEs should be deferred)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable a GPE based on the GPE type
 *
 ******************************************************************************/

acpi_status
acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,
		   u8 write_to_hardware)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("ev_enable_gpe");

	/* Make sure HW enable masks are updated */

	status =
	    acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_ENABLE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Mark wake-enabled or HW enable, or both */

	switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
	case ACPI_GPE_TYPE_WAKE:

		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
		break;

	case ACPI_GPE_TYPE_WAKE_RUN:

		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);

		/*lint -fallthrough */

	case ACPI_GPE_TYPE_RUNTIME:

		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);

		if (write_to_hardware) {
			/* Clear the GPE (of stale events), then enable it */

			status = acpi_hw_clear_gpe(gpe_event_info);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}

			/* Enable the requested runtime GPE */

			status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
		}
		break;

	default:
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_disable_gpe
 *
 * PARAMETERS:  gpe_event_info          - GPE to disable
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable a GPE based on the GPE type
 *
 ******************************************************************************/

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

	ACPI_FUNCTION_TRACE("ev_disable_gpe");

	if (!(gpe_event_info->flags & ACPI_GPE_ENABLE_MASK)) {
		return_ACPI_STATUS(AE_OK);
	}

	/* Make sure HW enable masks are updated */

	status =
	    acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Mark wake-disabled or HW disable, or both */

	switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
	case ACPI_GPE_TYPE_WAKE:
		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
		break;

	case ACPI_GPE_TYPE_WAKE_RUN:
		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);

		/*lint -fallthrough */

	case ACPI_GPE_TYPE_RUNTIME:

		/* Disable the requested runtime GPE */

		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
		status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
		break;

	default:
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_get_gpe_event_info
 *
 * PARAMETERS:  gpe_device          - Device node.  NULL for GPE0/GPE1
 *              gpe_number          - Raw GPE number
 *
 * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 *
 * DESCRIPTION: Returns the event_info struct associated with this GPE.
 *              Validates the gpe_block and the gpe_number
 *
 *              Should be called only when the GPE lists are semaphore locked
 *              and not subject to change.
 *
 ******************************************************************************/

struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
						       u32 gpe_number)
{
	union acpi_operand_object *obj_desc;
	struct acpi_gpe_block_info *gpe_block;
	acpi_native_uint i;

	ACPI_FUNCTION_ENTRY();

	/* A NULL gpe_block means use the FADT-defined GPE block(s) */

	if (!gpe_device) {
		/* Examine GPE Block 0 and 1 (These blocks are permanent) */

		for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
			gpe_block = acpi_gbl_gpe_fadt_blocks[i];
			if (gpe_block) {
				if ((gpe_number >= gpe_block->block_base_number)
				    && (gpe_number <
					gpe_block->block_base_number +
					(gpe_block->register_count * 8))) {
					return (&gpe_block->
						event_info[gpe_number -
							   gpe_block->
							   block_base_number]);
				}
			}
		}

		/* The gpe_number was not in the range of either FADT GPE block */

		return (NULL);
	}

	/* A Non-NULL gpe_device means this is a GPE Block Device */

	obj_desc =
	    acpi_ns_get_attached_object((struct acpi_namespace_node *)
					gpe_device);
	if (!obj_desc || !obj_desc->device.gpe_block) {
		return (NULL);
	}

	gpe_block = obj_desc->device.gpe_block;

	if ((gpe_number >= gpe_block->block_base_number) &&
	    (gpe_number <
	     gpe_block->block_base_number + (gpe_block->register_count * 8))) {
		return (&gpe_block->
			event_info[gpe_number - gpe_block->block_base_number]);
	}

	return (NULL);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_gpe_detect
 *
 * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 *                                    Can have multiple GPE blocks attached.
 *
 * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 *
 * DESCRIPTION: Detect if any GP events have occurred.  This function is