hwsleep.c

h内核

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

/*
 * 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 <linux/module.h>

#include <acpi/acpi.h>

#define _COMPONENT          ACPI_HARDWARE
	 ACPI_MODULE_NAME    ("hwsleep")


#define METHOD_NAME__BFS        "\\_BFS"
#define METHOD_NAME__GTS        "\\_GTS"
#define METHOD_NAME__PTS        "\\_PTS"
#define METHOD_NAME__SST        "\\_SI._SST"
#define METHOD_NAME__WAK        "\\_WAK"

#define ACPI_SST_INDICATOR_OFF  0
#define ACPI_SST_WORKING        1
#define ACPI_SST_WAKING         2
#define ACPI_SST_SLEEPING       3
#define ACPI_SST_SLEEP_CONTEXT  4


/******************************************************************************
 *
 * FUNCTION:    acpi_set_firmware_waking_vector
 *
 * PARAMETERS:  physical_address    - Physical address of ACPI real mode
 *                                    entry point.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: access function for d_firmware_waking_vector field in FACS
 *
 ******************************************************************************/

acpi_status
acpi_set_firmware_waking_vector (
	acpi_physical_address physical_address)
{

	ACPI_FUNCTION_TRACE ("acpi_set_firmware_waking_vector");


	/* Set the vector */

	if (acpi_gbl_common_fACS.vector_width == 32) {
		*(ACPI_CAST_PTR (u32, acpi_gbl_common_fACS.firmware_waking_vector))
				= (u32) physical_address;
	}
	else {
		*acpi_gbl_common_fACS.firmware_waking_vector
				= physical_address;
	}

	return_ACPI_STATUS (AE_OK);
}


/******************************************************************************
 *
 * FUNCTION:    acpi_get_firmware_waking_vector
 *
 * PARAMETERS:  *physical_address   - Output buffer where contents of
 *                                    the firmware_waking_vector field of
 *                                    the FACS will be stored.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Access function for firmware_waking_vector field in FACS
 *
 ******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_get_firmware_waking_vector (
	acpi_physical_address *physical_address)
{

	ACPI_FUNCTION_TRACE ("acpi_get_firmware_waking_vector");


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

	/* Get the vector */

	if (acpi_gbl_common_fACS.vector_width == 32) {
		*physical_address = (acpi_physical_address)
			*(ACPI_CAST_PTR (u32, acpi_gbl_common_fACS.firmware_waking_vector));
	}
	else {
		*physical_address =
			*acpi_gbl_common_fACS.firmware_waking_vector;
	}

	return_ACPI_STATUS (AE_OK);
}
#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 indicator 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_REPORT_ERROR (("Method _SST failed, %s\n", acpi_format_exception (status)));
	}

	return_ACPI_STATUS (AE_OK);
}


/******************************************************************************
 *
 * 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_REPORT_ERROR (("Sleep values out of range: A=%X B=%X\n",
			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, ACPI_MTX_DO_NOT_LOCK);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

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

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

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