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* acpi.c - Linux ACPI driver
*
* Copyright (C) 1999 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
*/
/*
* See http://www.geocities.com/SiliconValley/Hardware/3165/
* for the user-level ACPI stuff
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/sysctl.h>
#include <linux/delay.h>
#include <linux/acpi.h>
/*
* Defines for 2.2.x
*/
#ifndef __exit
#define __exit
#endif
#ifndef module_init
#define module_init(x) int init_module(void) {return x();}
#endif
#ifndef module_exit
#define module_exit(x) void cleanup_module(void) {x();}
#endif
#ifndef DECLARE_WAIT_QUEUE_HEAD
#define DECLARE_WAIT_QUEUE_HEAD(x) struct wait_queue * x = NULL
#endif
/*
* Yes, it's unfortunate that we are relying on get_cmos_time
* because it is slow (> 1 sec.) and i386 only. It might be better
* to use some of the code from drivers/char/rtc.c in the near future
*/
extern unsigned long get_cmos_time(void);
static int acpi_control_thread(void *context);
static int acpi_do_ulong(ctl_table *ctl,
int write,
struct file *file,
void *buffer,
size_t *len);
static int acpi_do_event_reg(ctl_table *ctl,
int write,
struct file *file,
void *buffer,
size_t *len);
static int acpi_do_event(ctl_table *ctl,
int write,
struct file *file,
void *buffer,
size_t *len);
static int acpi_do_sleep(ctl_table *ctl,
int write,
struct file *file,
void *buffer,
size_t *len);
DECLARE_WAIT_QUEUE_HEAD(acpi_control_wait);
static struct ctl_table_header *acpi_sysctl = NULL;
static struct acpi_facp *acpi_facp = NULL;
static int acpi_fake_facp = 0;
static struct acpi_facs *acpi_facs = NULL;
static unsigned long acpi_facp_addr = 0;
static unsigned long acpi_dsdt_addr = 0;
// current system sleep state (S0 - S4)
static acpi_sstate_t acpi_sleep_state = ACPI_S0;
// time sleep began
static unsigned long acpi_sleep_start = 0;
static spinlock_t acpi_event_lock = SPIN_LOCK_UNLOCKED;
static volatile u32 acpi_pm1_status = 0;
static volatile u32 acpi_gpe_status = 0;
static volatile u32 acpi_gpe_level = 0;
static volatile acpi_sstate_t acpi_event_state = ACPI_S0;
static DECLARE_WAIT_QUEUE_HEAD(acpi_event_wait);
static spinlock_t acpi_devs_lock = SPIN_LOCK_UNLOCKED;
static LIST_HEAD(acpi_devs);
/* Make it impossible to enter C2/C3 until after we've initialized */
static unsigned long acpi_p_lvl2_lat = ACPI_INFINITE_LAT;
static unsigned long acpi_p_lvl3_lat = ACPI_INFINITE_LAT;
static unsigned long acpi_p_blk = 0;
static int acpi_p_lvl2_tested = 0;
static int acpi_p_lvl3_tested = 0;
// bits 8-15 are SLP_TYPa, bits 0-7 are SLP_TYPb
static unsigned long acpi_slp_typ[] =
{
ACPI_SLP_TYP_DISABLED, /* S0 */
ACPI_SLP_TYP_DISABLED, /* S1 */
ACPI_SLP_TYP_DISABLED, /* S2 */
ACPI_SLP_TYP_DISABLED, /* S3 */
ACPI_SLP_TYP_DISABLED, /* S4 */
ACPI_SLP_TYP_DISABLED /* S5 */
};
static struct ctl_table acpi_table[] =
{
{ACPI_FACP, "facp",
&acpi_facp_addr, sizeof(acpi_facp_addr),
0400, NULL, &acpi_do_ulong},
{ACPI_DSDT, "dsdt",
&acpi_dsdt_addr, sizeof(acpi_dsdt_addr),
0400, NULL, &acpi_do_ulong},
{ACPI_PM1_ENABLE, "pm1_enable",
NULL, 0,
0600, NULL, &acpi_do_event_reg},
{ACPI_GPE_ENABLE, "gpe_enable",
NULL, 0,
0600, NULL, &acpi_do_event_reg},
{ACPI_GPE_LEVEL, "gpe_level",
NULL, 0,
0600, NULL, &acpi_do_event_reg},
{ACPI_EVENT, "event", NULL, 0, 0400, NULL, &acpi_do_event},
{ACPI_P_BLK, "p_blk",
&acpi_p_blk, sizeof(acpi_p_blk),
0600, NULL, &acpi_do_ulong},
{ACPI_P_LVL2_LAT, "p_lvl2_lat",
&acpi_p_lvl2_lat, sizeof(acpi_p_lvl2_lat),
0644, NULL, &acpi_do_ulong},
{ACPI_P_LVL3_LAT, "p_lvl3_lat",
&acpi_p_lvl3_lat, sizeof(acpi_p_lvl3_lat),
0644, NULL, &acpi_do_ulong},
{ACPI_S0_SLP_TYP, "s0_slp_typ",
&acpi_slp_typ[ACPI_S0], sizeof(acpi_slp_typ[ACPI_S0]),
0600, NULL, &acpi_do_ulong},
{ACPI_S1_SLP_TYP, "s1_slp_typ",
&acpi_slp_typ[ACPI_S1], sizeof(acpi_slp_typ[ACPI_S1]),
0600, NULL, &acpi_do_ulong},
{ACPI_S5_SLP_TYP, "s5_slp_typ",
&acpi_slp_typ[ACPI_S5], sizeof(acpi_slp_typ[ACPI_S5]),
0600, NULL, &acpi_do_ulong},
{ACPI_SLEEP, "sleep", NULL, 0, 0600, NULL, &acpi_do_sleep},
{0}
};
static struct ctl_table acpi_dir_table[] =
{
{CTL_ACPI, "acpi", NULL, 0, 0555, acpi_table},
{0}
};
/*
* Get the value of the PM1 control register (SCI_EN, ...)
*/
static u32 acpi_read_pm1_control(struct acpi_facp *facp)
{
u32 value = 0;
if (facp->pm1a_cnt)
value = inw(facp->pm1a_cnt);
if (facp->pm1b_cnt)
value |= inw(facp->pm1b_cnt);
return value;
}
/*
* Set the value of the PM1 control register (BM_RLD, ...)
*/
static void acpi_write_pm1_control(struct acpi_facp *facp, u32 value)
{
if (facp->pm1a_cnt)
outw(value, facp->pm1a_cnt);
if (facp->pm1b_cnt)
outw(value, facp->pm1b_cnt);
}
/*
* Get the value of the fixed event status register
*/
static u32 acpi_read_pm1_status(struct acpi_facp *facp)
{
u32 value = 0;
if (facp->pm1a_evt)
value = inw(facp->pm1a_evt);
if (facp->pm1b_evt)
value |= inw(facp->pm1b_evt);
return value;
}
/*
* Set the value of the fixed event status register (clear events)
*/
static void acpi_write_pm1_status(struct acpi_facp *facp, u32 value)
{
if (facp->pm1a_evt)
outw(value, facp->pm1a_evt);
if (facp->pm1b_evt)
outw(value, facp->pm1b_evt);
}
/*
* Get the value of the fixed event enable register
*/
static u32 acpi_read_pm1_enable(struct acpi_facp *facp)
{
int offset = facp->pm1_evt_len >> 1;
u32 value = 0;
if (facp->pm1a_evt)
value = inw(facp->pm1a_evt + offset);
if (facp->pm1b_evt)
value |= inw(facp->pm1b_evt + offset);
return value;
}
/*
* Set the value of the fixed event enable register (enable events)
*/
static void acpi_write_pm1_enable(struct acpi_facp *facp, u32 value)
{
int offset = facp->pm1_evt_len >> 1;
if (facp->pm1a_evt)
outw(value, facp->pm1a_evt + offset);
if (facp->pm1b_evt)
outw(value, facp->pm1b_evt + offset);
}
/*
* Get the value of the general-purpose event status register
*/
static u32 acpi_read_gpe_status(struct acpi_facp *facp)
{
u32 value = 0;
int i, size;
if (facp->gpe1) {
size = facp->gpe1_len >> 1;
for (i = size - 1; i >= 0; i--)
value = (value << 8) | inb(facp->gpe1 + i);
}
if (facp->gpe0) {
size = facp->gpe0_len >> 1;
for (i = size - 1; i >= 0; i--)
value = (value << 8) | inb(facp->gpe0 + i);
}
return value;
}
/*
* Set the value of the general-purpose event status register (clear events)
*/
static void acpi_write_gpe_status(struct acpi_facp *facp, u32 value)
{
int i, size;
if (facp->gpe0) {
size = facp->gpe0_len >> 1;
for (i = 0; i < size; i++) {
outb(value & 0xff, facp->gpe0 + i);
value >>= 8;
}
}
if (facp->gpe1) {
size = facp->gpe1_len >> 1;
for (i = 0; i < size; i++) {
outb(value & 0xff, facp->gpe1 + i);
value >>= 8;
}
}
}
/*
* Get the value of the general-purpose event enable register
*/
static u32 acpi_read_gpe_enable(struct acpi_facp *facp)
{
u32 value = 0;
int i, size, offset;
offset = facp->gpe0_len >> 1;
if (facp->gpe1) {
size = facp->gpe1_len >> 1;
for (i = size - 1; i >= 0; i--) {
value = (value << 8) | inb(facp->gpe1 + offset + i);
}
}
if (facp->gpe0) {
size = facp->gpe0_len >> 1;
for (i = size - 1; i >= 0; i--)
value = (value << 8) | inb(facp->gpe0 + offset + i);
}
return value;
}
/*
* Set the value of the general-purpose event enable register (enable events)
*/
static void acpi_write_gpe_enable(struct acpi_facp *facp, u32 value)
{
int i, offset;
offset = facp->gpe0_len >> 1;
if (facp->gpe0) {
for (i = 0; i < offset; i++) {
outb(value & 0xff, facp->gpe0 + offset + i);
value >>= 8;
}
}
if (facp->gpe1) {
offset = facp->gpe1_len >> 1;
for (i = 0; i < offset; i++) {
outb(value & 0xff, facp->gpe1 + offset + i);
value >>= 8;
}
}
}
/*
* Map an ACPI table into virtual memory
*/
static struct acpi_table *__init acpi_map_table(u32 addr)
{
struct acpi_table *table = NULL;
if (addr) {
// map table header to determine size
table = (struct acpi_table *)
ioremap((unsigned long) addr,
sizeof(struct acpi_table));
if (table) {
unsigned long table_size = table->length;
iounmap(table);
// remap entire table
table = (struct acpi_table *)
ioremap((unsigned long) addr, table_size);
}
if (!table) {
/* ioremap is a pain, it returns NULL if the
* table starts within mapped physical memory.
* Hopefully, no table straddles a mapped/unmapped
* physical memory boundary, ugh
*/
table = (struct acpi_table*) phys_to_virt(addr);
}
}
return table;
}
/*
* Unmap an ACPI table from virtual memory
*/
static void acpi_unmap_table(struct acpi_table *table)
{
// iounmap ignores addresses within physical memory
if (table)
iounmap(table);
}
/*
* Locate and map ACPI tables
*/
static int __init acpi_find_tables(void)
{
struct acpi_rsdp *rsdp;
struct acpi_table *rsdt;
u32 *rsdt_entry;
int rsdt_entry_count;
unsigned long i;
// search BIOS memory for RSDP
for (i = ACPI_BIOS_ROM_BASE; i < ACPI_BIOS_ROM_END; i += 16) {
rsdp = (struct acpi_rsdp *) phys_to_virt(i);
if (rsdp->signature[0] == ACPI_RSDP1_SIG
&& rsdp->signature[1] == ACPI_RSDP2_SIG) {
char oem[7];
int j;
// strip trailing space and print OEM identifier
memcpy(oem, rsdp->oem, 6);
oem[6] = '\0';
for (j = 5;
j > 0 && (oem[j] == '\0' || oem[j] == ' ');
j--) {
oem[j] = '\0';
}
printk(KERN_INFO "ACPI: \"%s\" found at 0x%p\n",
oem, (void *) i);
break;
}
}
if (i >= ACPI_BIOS_ROM_END)
return -ENODEV;
// fetch RSDT from RSDP
rsdt = acpi_map_table(rsdp->rsdt);
if (!rsdt) {
printk(KERN_ERR "ACPI: missing RSDT at 0x%p\n",
(void*) rsdp->rsdt);
return -ENODEV;
}
else if (rsdt->signature != ACPI_RSDT_SIG) {
printk(KERN_ERR "ACPI: bad RSDT at 0x%p (%08x)\n",
(void*) rsdp->rsdt, (unsigned) rsdt->signature);
acpi_unmap_table(rsdt);
return -ENODEV;
}
// search RSDT for FACP
acpi_facp = NULL;
rsdt_entry = (u32 *) (rsdt + 1);
rsdt_entry_count = (int) ((rsdt->length - sizeof(*rsdt)) >> 2);
while (rsdt_entry_count) {
struct acpi_table *dt = acpi_map_table(*rsdt_entry);
if (dt && dt->signature == ACPI_FACP_SIG) {
acpi_facp = (struct acpi_facp*) dt;
acpi_facp_addr = *rsdt_entry;
acpi_dsdt_addr = acpi_facp->dsdt;
// map FACS if it exists
if (acpi_facp->facs) {
dt = acpi_map_table(acpi_facp->facs);
if (dt && dt->signature == ACPI_FACS_SIG) {
acpi_facs = (struct acpi_facs*) dt;
}
else {
acpi_unmap_table(dt);
}
}
}
else {
acpi_unmap_table(dt);
}
rsdt_entry++;
rsdt_entry_count--;
}
acpi_unmap_table(rsdt);
if (!acpi_facp) {
printk(KERN_ERR "ACPI: missing FACP\n");
return -ENODEV;
}
return 0;
}
/*
* Unmap or destroy ACPI tables
*/
static void acpi_destroy_tables(void)
{
if (!acpi_fake_facp)
acpi_unmap_table((struct acpi_table*) acpi_facp);
else
kfree(acpi_facp);
acpi_unmap_table((struct acpi_table*) acpi_facs);
}
/*
* Locate PIIX4 device and create a fake FACP
*/
static int __init acpi_find_piix4(void)
{
struct pci_dev *dev;
u32 base;
u16 cmd;
u8 pmregmisc;
dev = pci_find_device(PCI_VENDOR_ID_INTEL,
PCI_DEVICE_ID_INTEL_82371AB_3,
NULL);
if (!dev)
return -ENODEV;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
if (!(cmd & PCI_COMMAND_IO))
return -ENODEV;
pci_read_config_byte(dev, ACPI_PIIX4_PMREGMISC, &pmregmisc);
if (!(pmregmisc & ACPI_PIIX4_PMIOSE))
return -ENODEV;
pci_read_config_dword(dev, 0x40, &base);
if (!(base & PCI_BASE_ADDRESS_SPACE_IO))
return -ENODEV;
base &= PCI_BASE_ADDRESS_IO_MASK;
if (!base)
return -ENODEV;
printk(KERN_INFO "ACPI: found PIIX4 at 0x%04x\n", base);
acpi_facp = kmalloc(sizeof(struct acpi_facp), GFP_KERNEL);
if (!acpi_facp)
return -ENOMEM;
acpi_fake_facp = 1;
memset(acpi_facp, 0, sizeof(struct acpi_facp));
acpi_facp->int_model = ACPI_PIIX4_INT_MODEL;
acpi_facp->sci_int = ACPI_PIIX4_SCI_INT;
acpi_facp->smi_cmd = ACPI_PIIX4_SMI_CMD;
acpi_facp->acpi_enable = ACPI_PIIX4_ACPI_ENABLE;
acpi_facp->acpi_disable = ACPI_PIIX4_ACPI_DISABLE;
acpi_facp->s4bios_req = ACPI_PIIX4_S4BIOS_REQ;
acpi_facp->pm1a_evt = base + ACPI_PIIX4_PM1_EVT;
acpi_facp->pm1a_cnt = base + ACPI_PIIX4_PM1_CNT;
acpi_facp->pm2_cnt = ACPI_PIIX4_PM2_CNT;
acpi_facp->pm_tmr = base + ACPI_PIIX4_PM_TMR;
acpi_facp->gpe0 = base + ACPI_PIIX4_GPE0;
acpi_facp->pm1_evt_len = ACPI_PIIX4_PM1_EVT_LEN;
acpi_facp->pm1_cnt_len = ACPI_PIIX4_PM1_CNT_LEN;
acpi_facp->pm2_cnt_len = ACPI_PIIX4_PM2_CNT_LEN;
acpi_facp->pm_tm_len = ACPI_PIIX4_PM_TM_LEN;
acpi_facp->gpe0_len = ACPI_PIIX4_GPE0_LEN;
acpi_facp->p_lvl2_lat = (__u16) ACPI_INFINITE_LAT;
acpi_facp->p_lvl3_lat = (__u16) ACPI_INFINITE_LAT;
acpi_facp_addr = virt_to_phys(acpi_facp);
acpi_dsdt_addr = 0;
acpi_p_blk = base + ACPI_PIIX4_P_BLK;
return 0;
}
/*
* Handle an ACPI SCI (fixed or general purpose event)
*/
static void acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
{
u32 pm1_status, gpe_status, gpe_level, gpe_edge;
unsigned long flags;
// detect and clear fixed events
pm1_status = (acpi_read_pm1_status(acpi_facp)
& acpi_read_pm1_enable(acpi_facp));
acpi_write_pm1_status(acpi_facp, pm1_status);
// detect and handle general-purpose events
gpe_status = (acpi_read_gpe_status(acpi_facp)
& acpi_read_gpe_enable(acpi_facp));
gpe_level = gpe_status & acpi_gpe_level;
if (gpe_level) {
// disable level-triggered events (re-enabled after handling)
acpi_write_gpe_enable(
acpi_facp,
acpi_read_gpe_enable(acpi_facp) & ~gpe_level);
}
gpe_edge = gpe_status & ~gpe_level;
if (gpe_edge) {
// clear edge-triggered events
while (acpi_read_gpe_status(acpi_facp) & gpe_edge)
acpi_write_gpe_status(acpi_facp, gpe_edge);
}
// notify process waiting on /dev/acpi
spin_lock_irqsave(&acpi_event_lock, flags);
acpi_pm1_status |= pm1_status;
acpi_gpe_status |= gpe_status;
spin_unlock_irqrestore(&acpi_event_lock, flags);
acpi_event_state = acpi_sleep_state;
wake_up_interruptible(&acpi_event_wait);
}
/*
* Is ACPI enabled or not?
*/
static inline int acpi_is_enabled(struct acpi_facp *facp)
{
return ((acpi_read_pm1_control(facp) & ACPI_SCI_EN) ? 1:0);
}
/*
* Enable SCI
*/
static int acpi_enable(struct acpi_facp *facp)
{
if (facp->smi_cmd)
outb(facp->acpi_enable, facp->smi_cmd);
return (acpi_is_enabled(facp) ? 0:-1);
}
/*
* Disable SCI
*/
static int acpi_disable(struct acpi_facp *facp)
{
// disable and clear any pending events
acpi_write_gpe_enable(facp, 0);
while (acpi_read_gpe_status(facp))
acpi_write_gpe_status(facp, acpi_read_gpe_status(facp));
acpi_write_pm1_enable(facp, 0);
acpi_write_pm1_status(facp, acpi_read_pm1_status(facp));
/* writing acpi_disable to smi_cmd would be appropriate
* here but this causes a nasty crash on many systems
*/
return 0;
}
/*
* Idle loop (uniprocessor only)
*/
static void acpi_idle_handler(void)
{
static int sleep_level = 1;
u32 pm1_cnt, timer, pm2_cnt, bm_active;
unsigned long time, usec;
// return to C0 on bus master request (necessary for C3 only)
pm1_cnt = acpi_read_pm1_control(acpi_facp);
if (sleep_level == 3) {
if (!(pm1_cnt & ACPI_BM_RLD)) {
pm1_cnt |= ACPI_BM_RLD;
acpi_write_pm1_control(acpi_facp, pm1_cnt);
}
}
else {
if (pm1_cnt & ACPI_BM_RLD) {
pm1_cnt &= ~ACPI_BM_RLD;
acpi_write_pm1_control(acpi_facp, pm1_cnt);
}
}
// clear bus master activity flag
acpi_write_pm1_status(acpi_facp, ACPI_BM);
// get current time (fallback to CPU cycles if no PM timer)
timer = acpi_facp->pm_tmr;
if (timer)
time = inl(timer);
else
time = get_cycles();
// sleep
switch (sleep_level) {
case 1:
__asm__ __volatile__("sti ; hlt": : :"memory");
break;
case 2:
inb(acpi_p_blk + ACPI_P_LVL2);
break;
case 3:
pm2_cnt = acpi_facp->pm2_cnt;
if (pm2_cnt) {
/* Disable PCI arbitration while sleeping,
to avoid DMA corruption? */
outb(inb(pm2_cnt) | ACPI_ARB_DIS, pm2_cnt);
inb(acpi_p_blk + ACPI_P_LVL3);
outb(inb(pm2_cnt) & ~ACPI_ARB_DIS, pm2_cnt);
}
else {
inb(acpi_p_blk + ACPI_P_LVL3);
}
break;
}
// calculate time spent sleeping (fallback to CPU cycles)
if (timer)
time = (inl(timer) - time) & ACPI_TMR_MASK;
else
time = ACPI_CPU_TO_TMR_TICKS(get_cycles() - time);
// check for bus master activity
bm_active = (acpi_read_pm1_status(acpi_facp) & ACPI_BM);
// record working C2/C3
if (sleep_level == 2 && !acpi_p_lvl2_tested) {
acpi_p_lvl2_tested = 1;
printk(KERN_INFO "ACPI: C2 works\n");
}
else if (sleep_level == 3 && !acpi_p_lvl3_tested) {
acpi_p_lvl3_tested = 1;
printk(KERN_INFO "ACPI: C3 works\n");
}
// pick next C-state based on time spent sleeping,
// C-state latencies, and bus master activity
sleep_level = 1;
if (acpi_p_blk) {
usec = ACPI_TMR_TICKS_TO_uS(time);
if (usec > acpi_p_lvl3_lat && !bm_active)
sleep_level = 3;
else if (usec > acpi_p_lvl2_lat)
sleep_level = 2;
}
}
/*
* Put all devices into specified D-state
*/
static int acpi_enter_dx(acpi_dstate_t state)
{
int status = 0;
struct list_head *i = acpi_devs.next;
while (i != &acpi_devs) {
struct acpi_dev *dev = list_entry(i, struct acpi_dev, entry);
if (dev->state != state) {
int dev_status = 0;
if (dev->info.transition)
dev_status = dev->info.transition(dev, state);
if (!dev_status) {
// put hardware into D-state
dev->state = state;
}
if (dev_status)
status = dev_status;
}
i = i->next;
}
return status;
}
/*
* Update system time from real-time clock
*/
static void acpi_update_clock(void)
{
if (acpi_sleep_start) {
unsigned long delta;
struct timeval tv;
delta = get_cmos_time() - acpi_sleep_start;
do_gettimeofday(&tv);
tv.tv_sec += delta;
do_settimeofday(&tv);
acpi_sleep_start = 0;
}
}
/*
* Enter system sleep state
*/
static void acpi_enter_sx(acpi_sstate_t state)
{
unsigned long slp_typ = acpi_slp_typ[(int) state];
if (slp_typ != ACPI_SLP_TYP_DISABLED) {
u16 typa, typb, value;
// bits 8-15 are SLP_TYPa, bits 0-7 are SLP_TYPb
typa = (slp_typ >> 8) & 0xff;
typb = slp_typ & 0xff;
typa = ((typa << ACPI_SLP_TYP_SHIFT) & ACPI_SLP_TYP_MASK);
typb = ((typb << ACPI_SLP_TYP_SHIFT) & ACPI_SLP_TYP_MASK);
if (state != ACPI_S0) {
acpi_sleep_start = get_cmos_time();
acpi_enter_dx(ACPI_D3);
acpi_sleep_state = state;
}
// clear wake status
acpi_write_pm1_status(acpi_facp, ACPI_WAK);
// set SLP_TYPa/b and SLP_EN
if (acpi_facp->pm1a_cnt) {
value = inw(acpi_facp->pm1a_cnt) & ~ACPI_SLP_TYP_MASK;
outw(value | typa | ACPI_SLP_EN, acpi_facp->pm1a_cnt);
}
if (acpi_facp->pm1b_cnt) {
value = inw(acpi_facp->pm1b_cnt) & ~ACPI_SLP_TYP_MASK;
outw(value | typb | ACPI_SLP_EN, acpi_facp->pm1b_cnt);
}
if (state == ACPI_S0) {
acpi_sleep_state = state;
acpi_enter_dx(ACPI_D0);
acpi_sleep_start = 0;
}
else if (state == ACPI_S1) {
// wait until S1 is entered
while (!(acpi_read_pm1_status(acpi_facp) & ACPI_WAK)) ;
// finished sleeping, update system time
acpi_update_clock();
}
}
}
/*
* Enter soft-off (S5)
*/
static void acpi_power_off_handler(void)
{
acpi_enter_sx(ACPI_S5);
}
/*
* Claim ACPI I/O ports
*/
static int acpi_claim_ioports(struct acpi_facp *facp)
{
// we don't get a guarantee of contiguity for any of the ACPI registers
if (facp->pm1a_evt)
request_region(facp->pm1a_evt, facp->pm1_evt_len, "acpi");
if (facp->pm1b_evt)
request_region(facp->pm1b_evt, facp->pm1_evt_len, "acpi");
if (facp->pm1a_cnt)
request_region(facp->pm1a_cnt, facp->pm1_cnt_len, "acpi");
if (facp->pm1b_cnt)
request_region(facp->pm1b_cnt, facp->pm1_cnt_len, "acpi");
if (facp->pm_tmr)
request_region(facp->pm_tmr, facp->pm_tm_len, "acpi");
if (facp->gpe0)
request_region(facp->gpe0, facp->gpe0_len, "acpi");
if (facp->gpe1)
request_region(facp->gpe1, facp->gpe1_len, "acpi");
return 0;
}
/*
* Free ACPI I/O ports
*/
static int acpi_release_ioports(struct acpi_facp *facp)
{
// we don't get a guarantee of contiguity for any of the ACPI registers
if (facp->pm1a_evt)
release_region(facp->pm1a_evt, facp->pm1_evt_len);
if (facp->pm1b_evt)
release_region(facp->pm1b_evt, facp->pm1_evt_len);
if (facp->pm1a_cnt)
release_region(facp->pm1a_cnt, facp->pm1_cnt_len);
if (facp->pm1b_cnt)
release_region(facp->pm1b_cnt, facp->pm1_cnt_len);
if (facp->pm_tmr)
release_region(facp->pm_tmr, facp->pm_tm_len);
if (facp->gpe0)
release_region(facp->gpe0, facp->gpe0_len);
if (facp->gpe1)
release_region(facp->gpe1, facp->gpe1_len);
return 0;
}
/*
* Examine/modify value
*/
static int acpi_do_ulong(ctl_table *ctl,
int write,
struct file *file,
void *buffer,
size_t *len)
{
char str[2 * sizeof(unsigned long) + 4], *strend;
unsigned long val;
int size;
if (!write) {
if (file->f_pos) {
*len = 0;
return 0;
}
val = *(unsigned long*) ctl->data;
size = sprintf(str, "0x%08lx\n", val);
if (*len >= size) {
copy_to_user(buffer, str, size);
*len = size;
}
else
*len = 0;
}
else {
size = sizeof(str) - 1;
if (size > *len)
size = *len;
copy_from_user(str, buffer, size);
str[size] = '\0';
val = simple_strtoul(str, &strend, 0);
if (strend == str)
return -EINVAL;
*(unsigned long*) ctl->data = val;
}
file->f_pos += *len;
return 0;
}
/*
* Examine/modify event register
*/
static int acpi_do_event_reg(ctl_table *ctl,
int write,
struct file *file,
void *buffer,
size_t *len)
{
char str[2 * sizeof(u32) + 4], *strend;
u32 val, enabling;
int size;
if (!write) {
if (file->f_pos) {
*len = 0;
return 0;
}
val = 0;
switch (ctl->ctl_name) {
case ACPI_PM1_ENABLE:
val = acpi_read_pm1_enable(acpi_facp);
break;
case ACPI_GPE_ENABLE:
val = acpi_read_gpe_enable(acpi_facp);
break;
case ACPI_GPE_LEVEL:
val = acpi_gpe_level;
break;
}
size = sprintf(str, "0x%08x\n", val);
if (*len >= size) {
copy_to_user(buffer, str, size);
*len = size;
}
else
*len = 0;
}
else
{
// fetch user value
size = sizeof(str) - 1;
if (size > *len)
size = *len;
copy_from_user(str, buffer, size);
str[size] = '\0';
val = (u32) simple_strtoul(str, &strend, 0);
if (strend == str)
return -EINVAL;
// store value in register
switch (ctl->ctl_name) {
case ACPI_PM1_ENABLE:
// clear previously disabled events
enabling = (val
& ~acpi_read_pm1_enable(acpi_facp));
acpi_write_pm1_status(acpi_facp, enabling);
if (val) {
// enable ACPI unless it is already
if (!acpi_is_enabled(acpi_facp))
acpi_enable(acpi_facp);
}
else if (!acpi_read_gpe_enable(acpi_facp)) {
// disable ACPI unless it is already
if (acpi_is_enabled(acpi_facp))
acpi_disable(acpi_facp);
}
acpi_write_pm1_enable(acpi_facp, val);
break;
case ACPI_GPE_ENABLE:
// clear previously disabled events
enabling = (val
& ~acpi_read_gpe_enable(acpi_facp));
while (acpi_read_gpe_status(acpi_facp) & enabling)
acpi_write_gpe_status(acpi_facp, enabling);
if (val) {
// enable ACPI unless it is already
if (!acpi_is_enabled(acpi_facp))
acpi_enable(acpi_facp);
}
else if (!acpi_read_pm1_enable(acpi_facp)) {
// disable ACPI unless it is already
if (acpi_is_enabled(acpi_facp))
acpi_disable(acpi_facp);
}
acpi_write_gpe_enable(acpi_facp, val);
break;
case ACPI_GPE_LEVEL:
acpi_gpe_level = val;
break;
}
}
file->f_pos += *len;
return 0;
}
/*
* Wait for next event
*/
static int acpi_do_event(ctl_table *ctl,
int write,
struct file *file,
void *buffer,
size_t *len)
{
u32 pm1_status = 0, gpe_status = 0;
acpi_sstate_t event_state = 0;
char str[27];
int size;
if (write)
return -EPERM;
if (*len < sizeof(str)) {
*len = 0;
return 0;
}
for (;;) {
unsigned long flags;
// we need an atomic exchange here
spin_lock_irqsave(&acpi_event_lock, flags);
pm1_status = acpi_pm1_status;
acpi_pm1_status = 0;
gpe_status = acpi_gpe_status;
acpi_gpe_status = 0;
spin_unlock_irqrestore(&acpi_event_lock, flags);
event_state = acpi_event_state;
if (pm1_status || gpe_status)
break;
// wait for an event to arrive
interruptible_sleep_on(&acpi_event_wait);
if (signal_pending(current))
return -ERESTARTSYS;
}
size = sprintf(str, "0x%08x 0x%08x 0x%01x\n",
pm1_status,
gpe_status,
event_state);
copy_to_user(buffer, str, size);
*len = size;
file->f_pos += size;
return 0;
}
/*
* Enter system sleep state
*/
static int acpi_do_sleep(ctl_table *ctl,
int write,
struct file *file,
void *buffer,
size_t *len)
{
if (!write) {
if (file->f_pos) {
*len = 0;
return 0;
}
}
else
{
acpi_enter_sx(ACPI_S1);
acpi_enter_sx(ACPI_S0);
}
file->f_pos += *len;
return 0;
}
/*
* Initialize and enable ACPI
*/
static int __init acpi_init(void)
{
int pid;
if (acpi_find_tables() && acpi_find_piix4()) {
// no ACPI tables and not PIIX4
return -ENODEV;
}
if (acpi_facp->p_lvl2_lat
&& acpi_facp->p_lvl2_lat <= ACPI_MAX_P_LVL2_LAT) {
acpi_p_lvl2_lat = acpi_facp->p_lvl2_lat;
}
if (acpi_facp->p_lvl3_lat
&& acpi_facp->p_lvl3_lat <= ACPI_MAX_P_LVL3_LAT) {
acpi_p_lvl3_lat = acpi_facp->p_lvl3_lat;
}
if (acpi_facp->sci_int
&& request_irq(acpi_facp->sci_int,
acpi_irq,
SA_INTERRUPT | SA_SHIRQ,
"acpi",
acpi_facp)) {
printk(KERN_ERR "ACPI: SCI (IRQ%d) allocation failed\n",
acpi_facp->sci_int);
acpi_destroy_tables();
return -ENODEV;
}
acpi_claim_ioports(acpi_facp);
acpi_sysctl = register_sysctl_table(acpi_dir_table, 1);
pid = kernel_thread(acpi_control_thread,
NULL,
CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
acpi_power_off = acpi_power_off_handler;
/*
* Set up the ACPI idle function. Note that we can't really
* do this with multiple CPU's, we'd need a per-CPU ACPI
* device..
*/
#ifdef __SMP__
if (smp_num_cpus > 1)
return 0;
#endif
acpi_idle = acpi_idle_handler;
return 0;
}
/*
* Disable and deinitialize ACPI
*/
static void __exit acpi_exit(void)
{
acpi_idle = NULL;
acpi_power_off = NULL;
unregister_sysctl_table(acpi_sysctl);
acpi_disable(acpi_facp);
acpi_release_ioports(acpi_facp);
if (acpi_facp->sci_int)
free_irq(acpi_facp->sci_int, acpi_facp);
acpi_destroy_tables();
}
/*
* Register a device with the ACPI subsystem
*/
struct acpi_dev* acpi_register(struct acpi_dev_info *info, unsigned long adr)
{
struct acpi_dev *dev = NULL;
if (info) {
dev = kmalloc(sizeof(struct acpi_dev), GFP_KERNEL);
if (dev) {
unsigned long flags;
memset(dev, 0, sizeof(*dev));
memcpy(&dev->info, info, sizeof(dev->info));
dev->adr = adr;
spin_lock_irqsave(&acpi_devs_lock, flags);
list_add(&dev->entry, &acpi_devs);
spin_unlock_irqrestore(&acpi_devs_lock, flags);
}
}
return dev;
}
/*
* Unregister a device with ACPI
*/
void acpi_unregister(struct acpi_dev *dev)
{
if (dev) {
unsigned long flags;
spin_lock_irqsave(&acpi_devs_lock, flags);
list_del(&dev->entry);
spin_unlock_irqrestore(&acpi_devs_lock, flags);
kfree(dev);
}
}
/*
* Wake up a device
*/
void acpi_wakeup(struct acpi_dev *dev)
{
// run _PS0 or tell parent bus to wake device up
}
/*
* Manage idle devices
*/
static int acpi_control_thread(void *context)
{
exit_mm(current);
exit_files(current);
strcpy(current->comm, "acpi");
for(;;) {
interruptible_sleep_on(&acpi_control_wait);
if (signal_pending(current))
break;
// find all idle devices and set idle timer
}
return 0;
}
__initcall(acpi_init);
/*
* Module visible symbols
*/
EXPORT_SYMBOL(acpi_control_wait);
EXPORT_SYMBOL(acpi_register);
EXPORT_SYMBOL(acpi_unregister);
EXPORT_SYMBOL(acpi_wakeup);
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