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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")
#define ACPI_SLP_TYP(typa, typb) (((int)(typa) << 8) | (int)(typb))
#define ACPI_SLP_TYPA(value) ((value) >> 8)
#define ACPI_SLP_TYPB(value) ((value) & 0xff)
struct acpi_enter_sx_ctx
{
wait_queue_head_t wait;
unsigned int state;
};
volatile acpi_sstate_t acpi_sleep_state = ACPI_S0;
static unsigned long acpi_slptyp[ACPI_S5 + 1] = {ACPI_INVALID,};
/*
* 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;
/*
* _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
*/
// run the _PTS 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_NUMBER;
arg.number.value = ctx->state;
acpi_evaluate_object(NULL, "\\_PTS", &arg_list, NULL);
// clear wake status by writing a 1
acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_LOCK, WAK_STS, 1);
acpi_sleep_state = ctx->state;
// set ACPI_SLP_TYPA/b and ACPI_SLP_EN
acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_LOCK, SLP_TYPE_A,
ACPI_SLP_TYPA(acpi_slptyp[ctx->state]));
acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_LOCK, SLP_TYPE_B,
ACPI_SLP_TYPB(acpi_slptyp[ctx->state]));
acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_LOCK, SLP_EN, 1);
if (ctx->state != ACPI_S1) {
/* we should have just shut off - what are we doing here? */
printk(KERN_ERR "ACPI: S%d failed\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_NUMBER;
arg.number.value = ctx->state;
acpi_evaluate_object(NULL, "\\_WAK", &arg_list, NULL);
out:
acpi_sleep_state = ACPI_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;
if ((STRNCMP(acpi_fadt.header.signature, ACPI_FADT_SIGNATURE, ACPI_SIG_LEN) != 0)
|| acpi_slptyp[ACPI_S5] == ACPI_INVALID)
return;
init_waitqueue_head(&ctx.wait);
ctx.state = ACPI_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;
if ((STRNCMP(acpi_fadt.header.signature, ACPI_FADT_SIGNATURE, ACPI_SIG_LEN) != 0)
|| acpi_slptyp[state] == ACPI_INVALID)
return -EINVAL;
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_S0; sx <= ACPI_S5; sx++) {
int ca_sx = (sx <= ACPI_S4) ? sx : (sx + 1);
if (ACPI_SUCCESS(
acpi_hw_obtain_sleep_type_register_data(ca_sx,
&type_a,
&type_b))) {
acpi_slptyp[sx] = ACPI_SLP_TYP(type_a, type_b);
printk(" S%d", sx);
}
else {
acpi_slptyp[sx] = ACPI_INVALID;
}
}
printk("\n");
pm_power_off = acpi_power_off;
return 0;
}
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