[mirror_ubuntu-hirsute-kernel.git] / drivers / acpi / hardware / hwsleep.c


/******************************************************************************
 *
 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, 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/actables.h>

#define _COMPONENT          ACPI_HARDWARE
ACPI_MODULE_NAME("hwsleep")

/*******************************************************************************
 *
 * FUNCTION:    acpi_set_firmware_waking_vector
 *
 * PARAMETERS:  physical_address    - Physical address of ACPI real mode
 *                                    entry point.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
 *
 ******************************************************************************/
acpi_status
acpi_set_firmware_waking_vector(acpi_physical_address physical_address)
{
	struct acpi_table_facs *facs;
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);

	/* Get the FACS */

	status =
	    acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
				    (struct acpi_table_header **)&facs);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Set the vector */

	if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
		/*
		 * ACPI 1.0 FACS or short table or optional X_ field is zero
		 */
		facs->firmware_waking_vector = (u32) physical_address;
	} else {
		/*
		 * ACPI 2.0 FACS with valid X_ field
		 */
		facs->xfirmware_waking_vector = physical_address;
	}

	return_ACPI_STATUS(AE_OK);
}

ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_firmware_waking_vector
 *
 * PARAMETERS:  *physical_address   - Where the contents of
 *                                    the firmware_waking_vector field of
 *                                    the FACS will be returned.
 *
 * RETURN:      Status, vector
 *
 * DESCRIPTION: Access function for the firmware_waking_vector field in FACS
 *
 ******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_get_firmware_waking_vector(acpi_physical_address * physical_address)
{
	struct acpi_table_facs *facs;
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_get_firmware_waking_vector);

	if (!physical_address) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Get the FACS */

	status =
	    acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
				    (struct acpi_table_header **)&facs);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Get the vector */

	if ((facs->length < 32) || (!(facs->xfirmware_waking_vector))) {
		/*
		 * ACPI 1.0 FACS or short table or optional X_ field is zero
		 */
		*physical_address =
		    (acpi_physical_address) facs->firmware_waking_vector;
	} else {
		/*
		 * ACPI 2.0 FACS with valid X_ field
		 */
		*physical_address =
		    (acpi_physical_address) facs->xfirmware_waking_vector;
	}

	return_ACPI_STATUS(AE_OK);
}

ACPI_EXPORT_SYMBOL(acpi_get_firmware_waking_vector)
#endif
/*******************************************************************************
 *
 * FUNCTION:    acpi_enter_sleep_state_prep
 *
 * PARAMETERS:  sleep_state         - Which sleep state to enter
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
 *              This function must execute with interrupts enabled.
 *              We break sleeping into 2 stages so that OSPM can handle
 *              various OS-specific tasks between the two steps.
 *
 ******************************************************************************/
acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
{
	acpi_status status;
	struct acpi_object_list arg_list;
	union acpi_object arg;

	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);

	/*
	 * _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
	 */
	status = acpi_get_sleep_type_data(sleep_state,
					  &acpi_gbl_sleep_type_a,
					  &acpi_gbl_sleep_type_b);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Setup parameter object */

	arg_list.count = 1;
	arg_list.pointer = &arg;

	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = sleep_state;

	/* Run the _PTS and _GTS methods */

	status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		return_ACPI_STATUS(status);
	}

	status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		return_ACPI_STATUS(status);
	}

	/* Setup the argument to _SST */

	switch (sleep_state) {
	case ACPI_STATE_S0:
		arg.integer.value = ACPI_SST_WORKING;
		break;

	case ACPI_STATE_S1:
	case ACPI_STATE_S2:
	case ACPI_STATE_S3:
		arg.integer.value = ACPI_SST_SLEEPING;
		break;

	case ACPI_STATE_S4:
		arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
		break;

	default:
		arg.integer.value = ACPI_SST_INDICATOR_OFF;	/* Default is off */
		break;
	}

	/* Set the system indicators to show the desired sleep state. */

	status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		ACPI_EXCEPTION((AE_INFO, status,
				"While executing method _SST"));
	}

	/*
	 * 1) Disable/Clear all GPEs
	 */
	status = acpi_hw_disable_all_gpes();
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	return_ACPI_STATUS(AE_OK);
}

ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)

/*******************************************************************************
 *
 * FUNCTION:    acpi_enter_sleep_state
 *
 * PARAMETERS:  sleep_state         - Which sleep state to enter
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 *
 ******************************************************************************/
acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
{
	u32 PM1Acontrol;
	u32 PM1Bcontrol;
	struct acpi_bit_register_info *sleep_type_reg_info;
	struct acpi_bit_register_info *sleep_enable_reg_info;
	u32 in_value;
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);

	if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
	    (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
		ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
			    acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
		return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
	}

	sleep_type_reg_info =
	    acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
	sleep_enable_reg_info =
	    acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);

	/* Clear wake status */

	status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Clear all fixed and general purpose status bits */

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

	/*
	 * 2) Enable all wakeup GPEs
	 */
	status = acpi_hw_disable_all_gpes();
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	acpi_gbl_system_awake_and_running = FALSE;

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

	/* Get current value of PM1A control */

	status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}
	ACPI_DEBUG_PRINT((ACPI_DB_INIT,
			  "Entering sleep state [S%d]\n", sleep_state));

	/* Clear SLP_EN and SLP_TYP fields */

	PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
			 sleep_enable_reg_info->access_bit_mask);
	PM1Bcontrol = PM1Acontrol;

	/* Insert SLP_TYP bits */

	PM1Acontrol |=
	    (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
	PM1Bcontrol |=
	    (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);

	/*
	 * We split the writes of SLP_TYP and SLP_EN to workaround
	 * poorly implemented hardware.
	 */

	/* Write #1: fill in SLP_TYP data */

	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
					PM1Acontrol);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
					PM1Bcontrol);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Insert SLP_ENABLE bit */

	PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
	PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;

	/* Write #2: SLP_TYP + SLP_EN */

	ACPI_FLUSH_CPU_CACHE();

	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
					PM1Acontrol);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
					PM1Bcontrol);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	if (sleep_state > ACPI_STATE_S3) {
		/*
		 * We wanted to sleep > S3, but it didn't happen (by virtue of the
		 * fact that we are still executing!)
		 *
		 * Wait ten seconds, then try again. This is to get S4/S5 to work on
		 * all machines.
		 *
		 * We wait so long to allow chipsets that poll this reg very slowly to
		 * still read the right value. Ideally, this block would go
		 * away entirely.
		 */
		acpi_os_stall(10000000);

		status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
						sleep_enable_reg_info->
						access_bit_mask);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/* Wait until we enter sleep state */

	do {
		status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		/* Spin until we wake */

	} while (!in_value);

	return_ACPI_STATUS(AE_OK);
}

ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)

/*******************************************************************************
 *
 * FUNCTION:    acpi_enter_sleep_state_s4bios
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform a S4 bios request.
 *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 *
 ******************************************************************************/
acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
{
	u32 in_value;
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);

	status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

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

	/*
	 * 1) Disable/Clear all GPEs
	 * 2) Enable all wakeup GPEs
	 */
	status = acpi_hw_disable_all_gpes();
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}
	acpi_gbl_system_awake_and_running = FALSE;

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

	ACPI_FLUSH_CPU_CACHE();

	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
				    (u32) acpi_gbl_FADT.S4bios_request, 8);

	do {
		acpi_os_stall(1000);
		status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	} while (!in_value);

	return_ACPI_STATUS(AE_OK);
}

ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)

/*******************************************************************************
 *
 * FUNCTION:    acpi_leave_sleep_state
 *
 * 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_leave_sleep_state(u8 sleep_state)
{
	struct acpi_object_list arg_list;
	union acpi_object arg;
	acpi_status status;
	struct acpi_bit_register_info *sleep_type_reg_info;
	struct acpi_bit_register_info *sleep_enable_reg_info;
	u32 PM1Acontrol;
	u32 PM1Bcontrol;

	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);

	/*
	 * Set SLP_TYPE and SLP_EN to state S0.
	 * This is unclear from the ACPI Spec, but it is required
	 * by some machines.
	 */
	status = acpi_get_sleep_type_data(ACPI_STATE_S0,
					  &acpi_gbl_sleep_type_a,
					  &acpi_gbl_sleep_type_b);
	if (ACPI_SUCCESS(status)) {
		sleep_type_reg_info =
		    acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
		sleep_enable_reg_info =
		    acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);

		/* Get current value of PM1A control */

		status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
					       &PM1Acontrol);
		if (ACPI_SUCCESS(status)) {

			/* Clear SLP_EN and SLP_TYP fields */

			PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
					 sleep_enable_reg_info->
					 access_bit_mask);
			PM1Bcontrol = PM1Acontrol;

			/* Insert SLP_TYP bits */

			PM1Acontrol |=
			    (acpi_gbl_sleep_type_a << sleep_type_reg_info->
			     bit_position);
			PM1Bcontrol |=
			    (acpi_gbl_sleep_type_b << sleep_type_reg_info->
			     bit_position);

			/* Just ignore any errors */

			(void)acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
						     PM1Acontrol);
			(void)acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
						     PM1Bcontrol);
		}
	}

	/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */

	acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;

	/* Setup parameter object */

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;

	/* Ignore any errors from these methods */

	arg.integer.value = ACPI_SST_WAKING;
	status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
	}

	arg.integer.value = sleep_state;
	status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
	}

	/*
	 * GPEs must be enabled before _WAK is called as GPEs
	 * might get fired there
	 *
	 * Restore the GPEs:
	 * 1) Disable/Clear all GPEs
	 * 2) Enable all runtime GPEs
	 */
	status = acpi_hw_disable_all_gpes();
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}
	status = acpi_hw_enable_all_runtime_gpes();
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
	}
	/* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */

	acpi_gbl_system_awake_and_running = TRUE;

	/* Enable power button */

	(void)
	    acpi_set_register(acpi_gbl_fixed_event_info
			      [ACPI_EVENT_POWER_BUTTON].enable_register_id, 1);

	(void)
	    acpi_set_register(acpi_gbl_fixed_event_info
			      [ACPI_EVENT_POWER_BUTTON].status_register_id, 1);

	arg.integer.value = ACPI_SST_WORKING;
	status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
	}

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)
Commit	Line	Data
1da177e4 LT	1
	2	/******************************************************************************
	3	*
	4	* Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
	5	*
	6	*****************************************************************************/
	7
	8	/*
6c9deb72	9	* Copyright (C) 2000 - 2007, R. Byron Moore
1da177e4 LT	10	* All rights reserved.
	11	*
	12	* Redistribution and use in source and binary forms, with or without
	13	* modification, are permitted provided that the following conditions
	14	* are met:
	15	* 1. Redistributions of source code must retain the above copyright
	16	* notice, this list of conditions, and the following disclaimer,
	17	* without modification.
	18	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	19	* substantially similar to the "NO WARRANTY" disclaimer below
	20	* ("Disclaimer") and any redistribution must be conditioned upon
	21	* including a substantially similar Disclaimer requirement for further
	22	* binary redistribution.
	23	* 3. Neither the names of the above-listed copyright holders nor the names
	24	* of any contributors may be used to endorse or promote products derived
	25	* from this software without specific prior written permission.
	26	*
	27	* Alternatively, this software may be distributed under the terms of the
	28	* GNU General Public License ("GPL") version 2 as published by the Free
	29	* Software Foundation.
	30	*
	31	* NO WARRANTY
	32	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	33	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	34	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	35	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	36	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	37	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	38	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	39	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	40	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	41	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	42	* POSSIBILITY OF SUCH DAMAGES.
	43	*/
	44
1da177e4	45	#include <acpi/acpi.h>
f3d2e786	46	#include <acpi/actables.h>
1da177e4 LT	47
1da177e4 LT	48	#define _COMPONENT ACPI_HARDWARE
4be44fcd	49	ACPI_MODULE_NAME("hwsleep")
1da177e4	50
44f6c012	51	/*******************************************************************************
1da177e4 LT	52	*
	53	* FUNCTION: acpi_set_firmware_waking_vector
	54	*
	55	* PARAMETERS: physical_address - Physical address of ACPI real mode
	56	* entry point.
	57	*
	58	* RETURN: Status
	59	*
44f6c012	60	* DESCRIPTION: Access function for the firmware_waking_vector field in FACS
1da177e4 LT	61	*
1da177e4 LT	62	******************************************************************************/
1da177e4	63	acpi_status
4be44fcd	64	acpi_set_firmware_waking_vector(acpi_physical_address physical_address)
1da177e4	65	{
f3d2e786 BM	66	struct acpi_table_facs *facs;
f3d2e786 BM	67	acpi_status status;
1da177e4	68
b229cf92	69	ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
1da177e4	70
f3d2e786 BM	71	/* Get the FACS */
	72
	73	status =
	74	acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
	75	(struct acpi_table_header **)&facs);
	76	if (ACPI_FAILURE(status)) {
	77	return_ACPI_STATUS(status);
	78	}
	79
1da177e4 LT	80	/* Set the vector */
1da177e4 LT	81
f3d2e786 BM	82	if ((facs->length < 32) \|\| (!(facs->xfirmware_waking_vector))) {
	83	/*
	84	* ACPI 1.0 FACS or short table or optional X_ field is zero
	85	*/
	86	facs->firmware_waking_vector = (u32) physical_address;
4be44fcd	87	} else {
f3d2e786 BM	88	/*
	89	* ACPI 2.0 FACS with valid X_ field
	90	*/
	91	facs->xfirmware_waking_vector = physical_address;
1da177e4 LT	92	}
1da177e4 LT	93
4be44fcd	94	return_ACPI_STATUS(AE_OK);
1da177e4 LT	95	}
1da177e4 LT	96
8313524a BM	97	ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
8313524a BM	98
44f6c012	99	/*******************************************************************************
1da177e4 LT	100	*
	101	* FUNCTION: acpi_get_firmware_waking_vector
	102	*
44f6c012	103	* PARAMETERS: *physical_address - Where the contents of
1da177e4	104	* the firmware_waking_vector field of
44f6c012	105	* the FACS will be returned.
1da177e4	106	*
44f6c012	107	* RETURN: Status, vector
1da177e4	108	*
44f6c012	109	* DESCRIPTION: Access function for the firmware_waking_vector field in FACS
1da177e4 LT	110	*
	111	******************************************************************************/
	112	#ifdef ACPI_FUTURE_USAGE
	113	acpi_status
4be44fcd	114	acpi_get_firmware_waking_vector(acpi_physical_address * physical_address)
1da177e4	115	{
f3d2e786 BM	116	struct acpi_table_facs *facs;
f3d2e786 BM	117	acpi_status status;
1da177e4	118
b229cf92	119	ACPI_FUNCTION_TRACE(acpi_get_firmware_waking_vector);
1da177e4 LT	120
1da177e4 LT	121	if (!physical_address) {
4be44fcd	122	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	123	}
1da177e4 LT	124
f3d2e786 BM	125	/* Get the FACS */
	126
	127	status =
	128	acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
	129	(struct acpi_table_header **)&facs);
	130	if (ACPI_FAILURE(status)) {
	131	return_ACPI_STATUS(status);
	132	}
	133
1da177e4 LT	134	/* Get the vector */
1da177e4 LT	135
f3d2e786 BM	136	if ((facs->length < 32) \|\| (!(facs->xfirmware_waking_vector))) {
	137	/*
	138	* ACPI 1.0 FACS or short table or optional X_ field is zero
	139	*/
	140	*physical_address =
	141	(acpi_physical_address) facs->firmware_waking_vector;
4be44fcd	142	} else {
f3d2e786 BM	143	/*
	144	* ACPI 2.0 FACS with valid X_ field
	145	*/
1da177e4	146	*physical_address =
f3d2e786	147	(acpi_physical_address) facs->xfirmware_waking_vector;
1da177e4 LT	148	}
1da177e4 LT	149
4be44fcd	150	return_ACPI_STATUS(AE_OK);
1da177e4	151	}
8313524a BM	152
8313524a BM	153	ACPI_EXPORT_SYMBOL(acpi_get_firmware_waking_vector)
1da177e4	154	#endif
44f6c012	155	/*******************************************************************************
1da177e4 LT	156	*
	157	* FUNCTION: acpi_enter_sleep_state_prep
	158	*
	159	* PARAMETERS: sleep_state - Which sleep state to enter
	160	*
	161	* RETURN: Status
	162	*
	163	* DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
	164	* This function must execute with interrupts enabled.
	165	* We break sleeping into 2 stages so that OSPM can handle
	166	* various OS-specific tasks between the two steps.
	167	*
	168	******************************************************************************/
4be44fcd	169	acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
1da177e4	170	{
4be44fcd LB	171	acpi_status status;
	172	struct acpi_object_list arg_list;
	173	union acpi_object arg;
1da177e4	174
b229cf92	175	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
1da177e4 LT	176
	177	/*
	178	* _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
	179	*/
4be44fcd LB	180	status = acpi_get_sleep_type_data(sleep_state,
	181	&acpi_gbl_sleep_type_a,
	182	&acpi_gbl_sleep_type_b);
	183	if (ACPI_FAILURE(status)) {
	184	return_ACPI_STATUS(status);
1da177e4 LT	185	}
	186
	187	/* Setup parameter object */
	188
	189	arg_list.count = 1;
	190	arg_list.pointer = &arg;
	191
	192	arg.type = ACPI_TYPE_INTEGER;
	193	arg.integer.value = sleep_state;
	194
	195	/* Run the _PTS and _GTS methods */
	196
4be44fcd LB	197	status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
	198	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
	199	return_ACPI_STATUS(status);
1da177e4 LT	200	}
1da177e4 LT	201
4be44fcd LB	202	status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
	203	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
	204	return_ACPI_STATUS(status);
1da177e4 LT	205	}
	206
	207	/* Setup the argument to _SST */
	208
	209	switch (sleep_state) {
	210	case ACPI_STATE_S0:
	211	arg.integer.value = ACPI_SST_WORKING;
	212	break;
	213
	214	case ACPI_STATE_S1:
	215	case ACPI_STATE_S2:
	216	case ACPI_STATE_S3:
	217	arg.integer.value = ACPI_SST_SLEEPING;
	218	break;
	219
	220	case ACPI_STATE_S4:
	221	arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
	222	break;
	223
	224	default:
4be44fcd	225	arg.integer.value = ACPI_SST_INDICATOR_OFF; /* Default is off */
1da177e4 LT	226	break;
	227	}
	228
	229	/* Set the system indicators to show the desired sleep state. */
	230
4be44fcd LB	231	status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
4be44fcd LB	232	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
b8e4d893 BM	233	ACPI_EXCEPTION((AE_INFO, status,
b8e4d893 BM	234	"While executing method _SST"));
1da177e4 LT	235	}
1da177e4 LT	236
ed41dab9 AS	237	/*
	238	* 1) Disable/Clear all GPEs
	239	*/
	240	status = acpi_hw_disable_all_gpes();
	241	if (ACPI_FAILURE(status)) {
	242	return_ACPI_STATUS(status);
	243	}
	244
4be44fcd	245	return_ACPI_STATUS(AE_OK);
1da177e4 LT	246	}
1da177e4 LT	247
8313524a BM	248	ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
8313524a BM	249
44f6c012	250	/*******************************************************************************
1da177e4 LT	251	*
	252	* FUNCTION: acpi_enter_sleep_state
	253	*
	254	* PARAMETERS: sleep_state - Which sleep state to enter
	255	*
	256	* RETURN: Status
	257	*
	258	* DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
	259	* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
	260	*
	261	******************************************************************************/
4be44fcd	262	acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
1da177e4	263	{
4be44fcd LB	264	u32 PM1Acontrol;
	265	u32 PM1Bcontrol;
	266	struct acpi_bit_register_info *sleep_type_reg_info;
	267	struct acpi_bit_register_info *sleep_enable_reg_info;
	268	u32 in_value;
	269	acpi_status status;
1da177e4	270
b229cf92	271	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
1da177e4 LT	272
1da177e4 LT	273	if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) \|\|
4be44fcd	274	(acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
b8e4d893 BM	275	ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
b8e4d893 BM	276	acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
4be44fcd	277	return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
1da177e4 LT	278	}
1da177e4 LT	279
4be44fcd LB	280	sleep_type_reg_info =
	281	acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
	282	sleep_enable_reg_info =
	283	acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
1da177e4 LT	284
	285	/* Clear wake status */
	286
d8c71b6d	287	status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
4be44fcd LB	288	if (ACPI_FAILURE(status)) {
4be44fcd LB	289	return_ACPI_STATUS(status);
1da177e4 LT	290	}
	291
	292	/* Clear all fixed and general purpose status bits */
	293
d8c71b6d	294	status = acpi_hw_clear_acpi_status();
4be44fcd LB	295	if (ACPI_FAILURE(status)) {
4be44fcd LB	296	return_ACPI_STATUS(status);
1da177e4 LT	297	}
	298
	299	/*
1da177e4 LT	300	* 2) Enable all wakeup GPEs
1da177e4 LT	301	*/
1d99967b AS	302	status = acpi_hw_disable_all_gpes();
	303	if (ACPI_FAILURE(status)) {
	304	return_ACPI_STATUS(status);
	305	}
	306
1da177e4 LT	307	acpi_gbl_system_awake_and_running = FALSE;
1da177e4 LT	308
4be44fcd LB	309	status = acpi_hw_enable_all_wakeup_gpes();
	310	if (ACPI_FAILURE(status)) {
	311	return_ACPI_STATUS(status);
1da177e4 LT	312	}
	313
	314	/* Get current value of PM1A control */
	315
d30dc9ab	316	status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
4be44fcd LB	317	if (ACPI_FAILURE(status)) {
4be44fcd LB	318	return_ACPI_STATUS(status);
1da177e4	319	}
4be44fcd LB	320	ACPI_DEBUG_PRINT((ACPI_DB_INIT,
4be44fcd LB	321	"Entering sleep state [S%d]\n", sleep_state));
1da177e4 LT	322
	323	/* Clear SLP_EN and SLP_TYP fields */
	324
44f6c012	325	PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask \|
4be44fcd	326	sleep_enable_reg_info->access_bit_mask);
1da177e4 LT	327	PM1Bcontrol = PM1Acontrol;
	328
	329	/* Insert SLP_TYP bits */
	330
4be44fcd LB	331	PM1Acontrol \|=
	332	(acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
	333	PM1Bcontrol \|=
	334	(acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
1da177e4 LT	335
	336	/*
	337	* We split the writes of SLP_TYP and SLP_EN to workaround
	338	* poorly implemented hardware.
	339	*/
	340
	341	/* Write #1: fill in SLP_TYP data */
	342
d30dc9ab	343	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
4be44fcd LB	344	PM1Acontrol);
	345	if (ACPI_FAILURE(status)) {
	346	return_ACPI_STATUS(status);
1da177e4 LT	347	}
1da177e4 LT	348
d30dc9ab	349	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
4be44fcd LB	350	PM1Bcontrol);
	351	if (ACPI_FAILURE(status)) {
	352	return_ACPI_STATUS(status);
1da177e4 LT	353	}
	354
	355	/* Insert SLP_ENABLE bit */
	356
	357	PM1Acontrol \|= sleep_enable_reg_info->access_bit_mask;
	358	PM1Bcontrol \|= sleep_enable_reg_info->access_bit_mask;
	359
	360	/* Write #2: SLP_TYP + SLP_EN */
	361
4be44fcd	362	ACPI_FLUSH_CPU_CACHE();
1da177e4	363
d30dc9ab	364	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
4be44fcd LB	365	PM1Acontrol);
	366	if (ACPI_FAILURE(status)) {
	367	return_ACPI_STATUS(status);
1da177e4 LT	368	}
1da177e4 LT	369
d30dc9ab	370	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
4be44fcd LB	371	PM1Bcontrol);
	372	if (ACPI_FAILURE(status)) {
	373	return_ACPI_STATUS(status);
1da177e4 LT	374	}
	375
	376	if (sleep_state > ACPI_STATE_S3) {
	377	/*
44f6c012 RM	378	* We wanted to sleep > S3, but it didn't happen (by virtue of the
44f6c012 RM	379	* fact that we are still executing!)
1da177e4	380	*
44f6c012 RM	381	* Wait ten seconds, then try again. This is to get S4/S5 to work on
44f6c012 RM	382	* all machines.
1da177e4 LT	383	*
	384	* We wait so long to allow chipsets that poll this reg very slowly to
	385	* still read the right value. Ideally, this block would go
	386	* away entirely.
	387	*/
4be44fcd LB	388	acpi_os_stall(10000000);
4be44fcd LB	389
d30dc9ab	390	status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
4be44fcd LB	391	sleep_enable_reg_info->
	392	access_bit_mask);
	393	if (ACPI_FAILURE(status)) {
	394	return_ACPI_STATUS(status);
1da177e4 LT	395	}
	396	}
	397
	398	/* Wait until we enter sleep state */
	399
	400	do {
d8c71b6d	401	status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
4be44fcd LB	402	if (ACPI_FAILURE(status)) {
4be44fcd LB	403	return_ACPI_STATUS(status);
1da177e4 LT	404	}
	405
	406	/* Spin until we wake */
	407
	408	} while (!in_value);
	409
4be44fcd	410	return_ACPI_STATUS(AE_OK);
1da177e4	411	}
1da177e4	412
8313524a	413	ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
1da177e4	414
44f6c012	415	/*******************************************************************************
1da177e4 LT	416	*
	417	* FUNCTION: acpi_enter_sleep_state_s4bios
	418	*
	419	* PARAMETERS: None
	420	*
	421	* RETURN: Status
	422	*
	423	* DESCRIPTION: Perform a S4 bios request.
	424	* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
	425	*
	426	******************************************************************************/
4be44fcd	427	acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
1da177e4	428	{
4be44fcd LB	429	u32 in_value;
4be44fcd LB	430	acpi_status status;
1da177e4	431
b229cf92	432	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
1da177e4	433
d8c71b6d	434	status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
4be44fcd LB	435	if (ACPI_FAILURE(status)) {
4be44fcd LB	436	return_ACPI_STATUS(status);
1da177e4 LT	437	}
1da177e4 LT	438
d8c71b6d	439	status = acpi_hw_clear_acpi_status();
4be44fcd LB	440	if (ACPI_FAILURE(status)) {
4be44fcd LB	441	return_ACPI_STATUS(status);
1da177e4 LT	442	}
	443
	444	/*
	445	* 1) Disable/Clear all GPEs
	446	* 2) Enable all wakeup GPEs
	447	*/
4be44fcd LB	448	status = acpi_hw_disable_all_gpes();
	449	if (ACPI_FAILURE(status)) {
	450	return_ACPI_STATUS(status);
1da177e4 LT	451	}
	452	acpi_gbl_system_awake_and_running = FALSE;
	453
4be44fcd LB	454	status = acpi_hw_enable_all_wakeup_gpes();
	455	if (ACPI_FAILURE(status)) {
	456	return_ACPI_STATUS(status);
1da177e4 LT	457	}
1da177e4 LT	458
4be44fcd	459	ACPI_FLUSH_CPU_CACHE();
1da177e4	460
f3d2e786 BM	461	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
f3d2e786 BM	462	(u32) acpi_gbl_FADT.S4bios_request, 8);
1da177e4 LT	463
	464	do {
	465	acpi_os_stall(1000);
d8c71b6d	466	status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
4be44fcd LB	467	if (ACPI_FAILURE(status)) {
4be44fcd LB	468	return_ACPI_STATUS(status);
1da177e4 LT	469	}
	470	} while (!in_value);
	471
4be44fcd	472	return_ACPI_STATUS(AE_OK);
1da177e4	473	}
1da177e4	474
8313524a	475	ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
1da177e4	476
44f6c012	477	/*******************************************************************************
1da177e4 LT	478	*
	479	* FUNCTION: acpi_leave_sleep_state
	480	*
	481	* PARAMETERS: sleep_state - Which sleep state we just exited
	482	*
	483	* RETURN: Status
	484	*
	485	* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
	486	* Called with interrupts ENABLED.
	487	*
	488	******************************************************************************/
4be44fcd	489	acpi_status acpi_leave_sleep_state(u8 sleep_state)
1da177e4	490	{
4be44fcd LB	491	struct acpi_object_list arg_list;
	492	union acpi_object arg;
	493	acpi_status status;
	494	struct acpi_bit_register_info *sleep_type_reg_info;
	495	struct acpi_bit_register_info *sleep_enable_reg_info;
	496	u32 PM1Acontrol;
	497	u32 PM1Bcontrol;
1da177e4	498
b229cf92	499	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
1da177e4 LT	500
	501	/*
	502	* Set SLP_TYPE and SLP_EN to state S0.
	503	* This is unclear from the ACPI Spec, but it is required
	504	* by some machines.
	505	*/
4be44fcd LB	506	status = acpi_get_sleep_type_data(ACPI_STATE_S0,
	507	&acpi_gbl_sleep_type_a,
	508	&acpi_gbl_sleep_type_b);
	509	if (ACPI_SUCCESS(status)) {
	510	sleep_type_reg_info =
	511	acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
	512	sleep_enable_reg_info =
	513	acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
1da177e4 LT	514
	515	/* Get current value of PM1A control */
	516
d30dc9ab	517	status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
4be44fcd LB	518	&PM1Acontrol);
4be44fcd LB	519	if (ACPI_SUCCESS(status)) {
52fc0b02	520
1da177e4 LT	521	/* Clear SLP_EN and SLP_TYP fields */
	522
	523	PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask \|
4be44fcd LB	524	sleep_enable_reg_info->
4be44fcd LB	525	access_bit_mask);
1da177e4 LT	526	PM1Bcontrol = PM1Acontrol;
	527
	528	/* Insert SLP_TYP bits */
	529
4be44fcd LB	530	PM1Acontrol \|=
	531	(acpi_gbl_sleep_type_a << sleep_type_reg_info->
	532	bit_position);
	533	PM1Bcontrol \|=
	534	(acpi_gbl_sleep_type_b << sleep_type_reg_info->
	535	bit_position);
1da177e4 LT	536
	537	/* Just ignore any errors */
	538
d30dc9ab	539	(void)acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
4be44fcd	540	PM1Acontrol);
d30dc9ab	541	(void)acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
4be44fcd	542	PM1Bcontrol);
1da177e4 LT	543	}
	544	}
	545
	546	/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
	547
	548	acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
	549
	550	/* Setup parameter object */
	551
	552	arg_list.count = 1;
	553	arg_list.pointer = &arg;
	554	arg.type = ACPI_TYPE_INTEGER;
	555
	556	/* Ignore any errors from these methods */
	557
	558	arg.integer.value = ACPI_SST_WAKING;
4be44fcd LB	559	status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
4be44fcd LB	560	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
b8e4d893	561	ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
1da177e4 LT	562	}
	563
	564	arg.integer.value = sleep_state;
4be44fcd LB	565	status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
4be44fcd LB	566	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
b8e4d893	567	ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
1da177e4 LT	568	}
1da177e4 LT	569
1da177e4	570	/*
79d2dfaa TR	571	* GPEs must be enabled before _WAK is called as GPEs
	572	* might get fired there
	573	*
1da177e4 LT	574	* Restore the GPEs:
	575	* 1) Disable/Clear all GPEs
	576	* 2) Enable all runtime GPEs
	577	*/
4be44fcd LB	578	status = acpi_hw_disable_all_gpes();
	579	if (ACPI_FAILURE(status)) {
	580	return_ACPI_STATUS(status);
1da177e4	581	}
4be44fcd LB	582	status = acpi_hw_enable_all_runtime_gpes();
	583	if (ACPI_FAILURE(status)) {
	584	return_ACPI_STATUS(status);
1da177e4 LT	585	}
1da177e4 LT	586
79d2dfaa TR	587	status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
	588	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
	589	ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
	590	}
	591	/* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
	592
	593	acpi_gbl_system_awake_and_running = TRUE;
	594
1da177e4 LT	595	/* Enable power button */
1da177e4 LT	596
4be44fcd LB	597	(void)
4be44fcd LB	598	acpi_set_register(acpi_gbl_fixed_event_info
d8c71b6d	599	[ACPI_EVENT_POWER_BUTTON].enable_register_id, 1);
44f6c012	600
4be44fcd LB	601	(void)
4be44fcd LB	602	acpi_set_register(acpi_gbl_fixed_event_info
d8c71b6d	603	[ACPI_EVENT_POWER_BUTTON].status_register_id, 1);
1da177e4 LT	604
1da177e4 LT	605	arg.integer.value = ACPI_SST_WORKING;
4be44fcd LB	606	status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
4be44fcd LB	607	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
b8e4d893	608	ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
1da177e4 LT	609	}
1da177e4 LT	610
4be44fcd	611	return_ACPI_STATUS(status);
1da177e4	612	}
8313524a BM	613
8313524a BM	614	ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)