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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 ACPI_SLP_TYP(typa, typb) (((int)(typa) << 8) | (int)(typb))
#define ACPI_SLP_TYPA(value) \
((((value) >> 8) << ACPI_SLP_TYP_SHIFT) & ACPI_SLP_TYP_MASK)
#define ACPI_SLP_TYPB(value) \
((((value) & 0xff) << ACPI_SLP_TYP_SHIFT) & ACPI_SLP_TYP_MASK)
struct acpi_enter_sx_ctx
{
wait_queue_head_t wait;
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;
struct acpi_facp *facp = &acpi_facp;
ACPI_OBJECT_LIST arg_list;
ACPI_OBJECT arg;
u16 value;
/*
* _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
acpi_write_pm1_status(facp, ACPI_WAK);
acpi_sleep_state = ctx->state;
// set ACPI_SLP_TYPA/b and ACPI_SLP_EN
__cli();
if (facp->pm1a_cnt) {
value = inw(facp->pm1a_cnt) & ~ACPI_SLP_TYP_MASK;
value |= (ACPI_SLP_TYPA(acpi_slptyp[ctx->state])
| ACPI_SLP_EN);
outw(value, facp->pm1a_cnt);
}
if (facp->pm1b_cnt) {
value = inw(facp->pm1b_cnt) & ~ACPI_SLP_TYP_MASK;
value |= (ACPI_SLP_TYPB(acpi_slptyp[ctx->state])
| ACPI_SLP_EN);
outw(value, facp->pm1b_cnt);
}
__sti();
if (ctx->state != ACPI_S1) {
printk(KERN_ERR "ACPI: S%d failed\n", ctx->state);
goto out;
}
// wait until S1 is entered
while (!(acpi_read_pm1_status(facp) & ACPI_WAK))
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 (acpi_facp.hdr.signature != ACPI_FACP_SIG
|| 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;
if (acpi_facp.hdr.signature != ACPI_FACP_SIG
|| acpi_slptyp[state] == ACPI_INVALID)
return -EINVAL;
init_waitqueue_head(&ctx.wait);
ctx.state = state;
if (acpi_os_queue_for_execution(0, acpi_enter_sx_async, &ctx))
return -1;
interruptible_sleep_on(&ctx.wait);
if (signal_pending(current))
return -ERESTARTSYS;
return 0;
}
int
acpi_sys_init(void)
{
u8 sx, typa, typb;
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,
&typa,
&typb)))
acpi_slptyp[sx] = ACPI_SLP_TYP(typa, typb);
else
acpi_slptyp[sx] = ACPI_INVALID;
}
if (acpi_slptyp[ACPI_S1] != ACPI_INVALID)
printk(KERN_INFO "ACPI: S1 supported\n");
if (acpi_slptyp[ACPI_S5] != ACPI_INVALID)
printk(KERN_INFO "ACPI: S5 supported\n");
pm_power_off = acpi_power_off;
return 0;
}
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