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/*
* sys.c - System management (suspend, ...)
*
* Copyright (C) 2000 Andrew Henroid
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/pm.h>
#include <linux/acpi.h>
#include "acpi.h"
#include "driver.h"
#define _COMPONENT OS_DEPENDENT
MODULE_NAME ("sys")
struct acpi_enter_sx_ctx
{
wait_queue_head_t wait;
unsigned int state;
};
volatile acpi_sstate_t acpi_sleep_state = ACPI_STATE_S0;
/*
* Enter system sleep state
*/
static void
acpi_enter_sx_async(void *context)
{
struct acpi_enter_sx_ctx *ctx = (struct acpi_enter_sx_ctx*) context;
ACPI_OBJECT_LIST arg_list;
ACPI_OBJECT arg;
acpi_enter_sleep_state(ctx->state);
/* either we are in S1, or the transition failed, as the other states resume
from the waking vector */
if (ctx->state != ACPI_STATE_S1) {
printk(KERN_ERR "Could not enter S%d\n", ctx->state);
goto out;
}
/* wait until S1 is entered */
while (!(acpi_hw_register_bit_access(ACPI_READ, ACPI_MTX_LOCK, WAK_STS)))
safe_halt();
/* run the _WAK method */
memset(&arg_list, 0, sizeof(arg_list));
arg_list.count = 1;
arg_list.pointer = &arg;
memset(&arg, 0, sizeof(arg));
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = ctx->state;
acpi_evaluate_object(NULL, "\\_WAK", &arg_list, NULL);
out:
acpi_sleep_state = ACPI_STATE_S0;
if (waitqueue_active(&ctx->wait))
wake_up_interruptible(&ctx->wait);
}
/*
* Enter soft-off (S5)
*/
static void
acpi_power_off(void)
{
struct acpi_enter_sx_ctx ctx;
init_waitqueue_head(&ctx.wait);
ctx.state = ACPI_STATE_S5;
acpi_enter_sx_async(&ctx);
}
/*
* Enter system sleep state and wait for completion
*/
int
acpi_enter_sx(acpi_sstate_t state)
{
struct acpi_enter_sx_ctx ctx;
DECLARE_WAITQUEUE(wait, current);
int ret = 0;
init_waitqueue_head(&ctx.wait);
ctx.state = state;
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&ctx.wait, &wait);
if (acpi_os_queue_for_execution(0, acpi_enter_sx_async, &ctx))
ret = -1;
if (!ret)
schedule();
set_current_state(TASK_RUNNING);
remove_wait_queue(&ctx.wait, &wait);
if (!ret && signal_pending(current))
ret = -ERESTARTSYS;
return ret;
}
int
acpi_sys_init(void)
{
u8 sx;
u8 type_a;
u8 type_b;
printk(KERN_INFO "ACPI: System firmware supports:");
for (sx = ACPI_STATE_S0; sx <= ACPI_STATE_S5; sx++) {
if (ACPI_SUCCESS(
acpi_hw_obtain_sleep_type_register_data(sx,
&type_a,
&type_b))) {
printk(" S%d", sx);
}
}
printk("\n");
pm_power_off = acpi_power_off;
return 0;
}
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