[deliverable/linux.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"));
	}

	/* Disable/Clear all GPEs */

	status = acpi_hw_disable_all_gpes();

	return_ACPI_STATUS(status);
}

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_unlocked(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
6cffd466 RW	237	/* Disable/Clear all GPEs */
6cffd466 RW	238
ed41dab9	239	status = acpi_hw_disable_all_gpes();
ed41dab9	240
6cffd466	241	return_ACPI_STATUS(status);
1da177e4 LT	242	}
1da177e4 LT	243
8313524a BM	244	ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
8313524a BM	245
44f6c012	246	/*******************************************************************************
1da177e4 LT	247	*
	248	* FUNCTION: acpi_enter_sleep_state
	249	*
	250	* PARAMETERS: sleep_state - Which sleep state to enter
	251	*
	252	* RETURN: Status
	253	*
	254	* DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
	255	* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
	256	*
	257	******************************************************************************/
4be44fcd	258	acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
1da177e4	259	{
4be44fcd LB	260	u32 PM1Acontrol;
	261	u32 PM1Bcontrol;
	262	struct acpi_bit_register_info *sleep_type_reg_info;
	263	struct acpi_bit_register_info *sleep_enable_reg_info;
	264	u32 in_value;
	265	acpi_status status;
1da177e4	266
b229cf92	267	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
1da177e4 LT	268
1da177e4 LT	269	if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) \|\|
4be44fcd	270	(acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
b8e4d893 BM	271	ACPI_ERROR((AE_INFO, "Sleep values out of range: A=%X B=%X",
b8e4d893 BM	272	acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
4be44fcd	273	return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
1da177e4 LT	274	}
1da177e4 LT	275
4be44fcd LB	276	sleep_type_reg_info =
	277	acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
	278	sleep_enable_reg_info =
	279	acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
1da177e4 LT	280
	281	/* Clear wake status */
	282
d8c71b6d	283	status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
4be44fcd LB	284	if (ACPI_FAILURE(status)) {
4be44fcd LB	285	return_ACPI_STATUS(status);
1da177e4 LT	286	}
	287
	288	/* Clear all fixed and general purpose status bits */
	289
d8c71b6d	290	status = acpi_hw_clear_acpi_status();
4be44fcd LB	291	if (ACPI_FAILURE(status)) {
4be44fcd LB	292	return_ACPI_STATUS(status);
1da177e4 LT	293	}
	294
	295	/*
1da177e4 LT	296	* 2) Enable all wakeup GPEs
1da177e4 LT	297	*/
1d99967b AS	298	status = acpi_hw_disable_all_gpes();
	299	if (ACPI_FAILURE(status)) {
	300	return_ACPI_STATUS(status);
	301	}
	302
1da177e4 LT	303	acpi_gbl_system_awake_and_running = FALSE;
1da177e4 LT	304
4be44fcd LB	305	status = acpi_hw_enable_all_wakeup_gpes();
	306	if (ACPI_FAILURE(status)) {
	307	return_ACPI_STATUS(status);
1da177e4 LT	308	}
	309
	310	/* Get current value of PM1A control */
	311
d30dc9ab	312	status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
4be44fcd LB	313	if (ACPI_FAILURE(status)) {
4be44fcd LB	314	return_ACPI_STATUS(status);
1da177e4	315	}
4be44fcd LB	316	ACPI_DEBUG_PRINT((ACPI_DB_INIT,
4be44fcd LB	317	"Entering sleep state [S%d]\n", sleep_state));
1da177e4 LT	318
	319	/* Clear SLP_EN and SLP_TYP fields */
	320
44f6c012	321	PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask \|
4be44fcd	322	sleep_enable_reg_info->access_bit_mask);
1da177e4 LT	323	PM1Bcontrol = PM1Acontrol;
	324
	325	/* Insert SLP_TYP bits */
	326
4be44fcd LB	327	PM1Acontrol \|=
	328	(acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
	329	PM1Bcontrol \|=
	330	(acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
1da177e4 LT	331
	332	/*
	333	* We split the writes of SLP_TYP and SLP_EN to workaround
	334	* poorly implemented hardware.
	335	*/
	336
	337	/* Write #1: fill in SLP_TYP data */
	338
d30dc9ab	339	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
4be44fcd LB	340	PM1Acontrol);
	341	if (ACPI_FAILURE(status)) {
	342	return_ACPI_STATUS(status);
1da177e4 LT	343	}
1da177e4 LT	344
d30dc9ab	345	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
4be44fcd LB	346	PM1Bcontrol);
	347	if (ACPI_FAILURE(status)) {
	348	return_ACPI_STATUS(status);
1da177e4 LT	349	}
	350
	351	/* Insert SLP_ENABLE bit */
	352
	353	PM1Acontrol \|= sleep_enable_reg_info->access_bit_mask;
	354	PM1Bcontrol \|= sleep_enable_reg_info->access_bit_mask;
	355
	356	/* Write #2: SLP_TYP + SLP_EN */
	357
4be44fcd	358	ACPI_FLUSH_CPU_CACHE();
1da177e4	359
d30dc9ab	360	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
4be44fcd LB	361	PM1Acontrol);
	362	if (ACPI_FAILURE(status)) {
	363	return_ACPI_STATUS(status);
1da177e4 LT	364	}
1da177e4 LT	365
d30dc9ab	366	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
4be44fcd LB	367	PM1Bcontrol);
	368	if (ACPI_FAILURE(status)) {
	369	return_ACPI_STATUS(status);
1da177e4 LT	370	}
	371
	372	if (sleep_state > ACPI_STATE_S3) {
	373	/*
44f6c012 RM	374	* We wanted to sleep > S3, but it didn't happen (by virtue of the
44f6c012 RM	375	* fact that we are still executing!)
1da177e4	376	*
44f6c012 RM	377	* Wait ten seconds, then try again. This is to get S4/S5 to work on
44f6c012 RM	378	* all machines.
1da177e4 LT	379	*
	380	* We wait so long to allow chipsets that poll this reg very slowly to
	381	* still read the right value. Ideally, this block would go
	382	* away entirely.
	383	*/
4be44fcd LB	384	acpi_os_stall(10000000);
4be44fcd LB	385
d30dc9ab	386	status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
4be44fcd LB	387	sleep_enable_reg_info->
	388	access_bit_mask);
	389	if (ACPI_FAILURE(status)) {
	390	return_ACPI_STATUS(status);
1da177e4 LT	391	}
	392	}
	393
	394	/* Wait until we enter sleep state */
	395
	396	do {
2d571b33 AS	397	status = acpi_get_register_unlocked(ACPI_BITREG_WAKE_STATUS,
2d571b33 AS	398	&in_value);
4be44fcd LB	399	if (ACPI_FAILURE(status)) {
4be44fcd LB	400	return_ACPI_STATUS(status);
1da177e4 LT	401	}
	402
	403	/* Spin until we wake */
	404
	405	} while (!in_value);
	406
4be44fcd	407	return_ACPI_STATUS(AE_OK);
1da177e4	408	}
1da177e4	409
8313524a	410	ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
1da177e4	411
44f6c012	412	/*******************************************************************************
1da177e4 LT	413	*
	414	* FUNCTION: acpi_enter_sleep_state_s4bios
	415	*
	416	* PARAMETERS: None
	417	*
	418	* RETURN: Status
	419	*
	420	* DESCRIPTION: Perform a S4 bios request.
	421	* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
	422	*
	423	******************************************************************************/
4be44fcd	424	acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
1da177e4	425	{
4be44fcd LB	426	u32 in_value;
4be44fcd LB	427	acpi_status status;
1da177e4	428
b229cf92	429	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
1da177e4	430
d8c71b6d	431	status = acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
4be44fcd LB	432	if (ACPI_FAILURE(status)) {
4be44fcd LB	433	return_ACPI_STATUS(status);
1da177e4 LT	434	}
1da177e4 LT	435
d8c71b6d	436	status = acpi_hw_clear_acpi_status();
4be44fcd LB	437	if (ACPI_FAILURE(status)) {
4be44fcd LB	438	return_ACPI_STATUS(status);
1da177e4 LT	439	}
	440
	441	/*
	442	* 1) Disable/Clear all GPEs
	443	* 2) Enable all wakeup GPEs
	444	*/
4be44fcd LB	445	status = acpi_hw_disable_all_gpes();
	446	if (ACPI_FAILURE(status)) {
	447	return_ACPI_STATUS(status);
1da177e4 LT	448	}
	449	acpi_gbl_system_awake_and_running = FALSE;
	450
4be44fcd LB	451	status = acpi_hw_enable_all_wakeup_gpes();
	452	if (ACPI_FAILURE(status)) {
	453	return_ACPI_STATUS(status);
1da177e4 LT	454	}
1da177e4 LT	455
4be44fcd	456	ACPI_FLUSH_CPU_CACHE();
1da177e4	457
f3d2e786 BM	458	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
f3d2e786 BM	459	(u32) acpi_gbl_FADT.S4bios_request, 8);
1da177e4 LT	460
	461	do {
	462	acpi_os_stall(1000);
d8c71b6d	463	status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
4be44fcd LB	464	if (ACPI_FAILURE(status)) {
4be44fcd LB	465	return_ACPI_STATUS(status);
1da177e4 LT	466	}
	467	} while (!in_value);
	468
4be44fcd	469	return_ACPI_STATUS(AE_OK);
1da177e4	470	}
1da177e4	471
8313524a	472	ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
1da177e4	473
44f6c012	474	/*******************************************************************************
1da177e4 LT	475	*
	476	* FUNCTION: acpi_leave_sleep_state
	477	*
	478	* PARAMETERS: sleep_state - Which sleep state we just exited
	479	*
	480	* RETURN: Status
	481	*
	482	* DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
	483	* Called with interrupts ENABLED.
	484	*
	485	******************************************************************************/
4be44fcd	486	acpi_status acpi_leave_sleep_state(u8 sleep_state)
1da177e4	487	{
4be44fcd LB	488	struct acpi_object_list arg_list;
	489	union acpi_object arg;
	490	acpi_status status;
	491	struct acpi_bit_register_info *sleep_type_reg_info;
	492	struct acpi_bit_register_info *sleep_enable_reg_info;
	493	u32 PM1Acontrol;
	494	u32 PM1Bcontrol;
1da177e4	495
b229cf92	496	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
1da177e4 LT	497
	498	/*
	499	* Set SLP_TYPE and SLP_EN to state S0.
	500	* This is unclear from the ACPI Spec, but it is required
	501	* by some machines.
	502	*/
4be44fcd LB	503	status = acpi_get_sleep_type_data(ACPI_STATE_S0,
	504	&acpi_gbl_sleep_type_a,
	505	&acpi_gbl_sleep_type_b);
	506	if (ACPI_SUCCESS(status)) {
	507	sleep_type_reg_info =
	508	acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE_A);
	509	sleep_enable_reg_info =
	510	acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
1da177e4 LT	511
	512	/* Get current value of PM1A control */
	513
d30dc9ab	514	status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
4be44fcd LB	515	&PM1Acontrol);
4be44fcd LB	516	if (ACPI_SUCCESS(status)) {
52fc0b02	517
1da177e4 LT	518	/* Clear SLP_EN and SLP_TYP fields */
	519
	520	PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask \|
4be44fcd LB	521	sleep_enable_reg_info->
4be44fcd LB	522	access_bit_mask);
1da177e4 LT	523	PM1Bcontrol = PM1Acontrol;
	524
	525	/* Insert SLP_TYP bits */
	526
4be44fcd LB	527	PM1Acontrol \|=
	528	(acpi_gbl_sleep_type_a << sleep_type_reg_info->
	529	bit_position);
	530	PM1Bcontrol \|=
	531	(acpi_gbl_sleep_type_b << sleep_type_reg_info->
	532	bit_position);
1da177e4 LT	533
	534	/* Just ignore any errors */
	535
d30dc9ab	536	(void)acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,
4be44fcd	537	PM1Acontrol);
d30dc9ab	538	(void)acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,
4be44fcd	539	PM1Bcontrol);
1da177e4 LT	540	}
	541	}
	542
	543	/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
	544
	545	acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
	546
	547	/* Setup parameter object */
	548
	549	arg_list.count = 1;
	550	arg_list.pointer = &arg;
	551	arg.type = ACPI_TYPE_INTEGER;
	552
	553	/* Ignore any errors from these methods */
	554
	555	arg.integer.value = ACPI_SST_WAKING;
4be44fcd LB	556	status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
4be44fcd LB	557	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
b8e4d893	558	ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
1da177e4 LT	559	}
	560
	561	arg.integer.value = sleep_state;
4be44fcd LB	562	status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
4be44fcd LB	563	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
b8e4d893	564	ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
1da177e4 LT	565	}
1da177e4 LT	566
1da177e4	567	/*
79d2dfaa TR	568	* GPEs must be enabled before _WAK is called as GPEs
	569	* might get fired there
	570	*
1da177e4 LT	571	* Restore the GPEs:
	572	* 1) Disable/Clear all GPEs
	573	* 2) Enable all runtime GPEs
	574	*/
4be44fcd LB	575	status = acpi_hw_disable_all_gpes();
	576	if (ACPI_FAILURE(status)) {
	577	return_ACPI_STATUS(status);
1da177e4	578	}
4be44fcd LB	579	status = acpi_hw_enable_all_runtime_gpes();
	580	if (ACPI_FAILURE(status)) {
	581	return_ACPI_STATUS(status);
1da177e4 LT	582	}
1da177e4 LT	583
79d2dfaa TR	584	status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
	585	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
	586	ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
	587	}
	588	/* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
	589
	590	acpi_gbl_system_awake_and_running = TRUE;
	591
1da177e4 LT	592	/* Enable power button */
1da177e4 LT	593
4be44fcd LB	594	(void)
4be44fcd LB	595	acpi_set_register(acpi_gbl_fixed_event_info
d8c71b6d	596	[ACPI_EVENT_POWER_BUTTON].enable_register_id, 1);
44f6c012	597
4be44fcd LB	598	(void)
4be44fcd LB	599	acpi_set_register(acpi_gbl_fixed_event_info
d8c71b6d	600	[ACPI_EVENT_POWER_BUTTON].status_register_id, 1);
1da177e4 LT	601
1da177e4 LT	602	arg.integer.value = ACPI_SST_WORKING;
4be44fcd LB	603	status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
4be44fcd LB	604	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
b8e4d893	605	ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
1da177e4 LT	606	}
1da177e4 LT	607
4be44fcd	608	return_ACPI_STATUS(status);
1da177e4	609	}
8313524a BM	610
8313524a BM	611	ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)