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linux/drivers/acpi/sleep/proc.c

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#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/suspend.h>
#include <linux/bcd.h>
#include <asm/uaccess.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#ifdef CONFIG_X86
#include <linux/mc146818rtc.h>
#endif
#include "sleep.h"
#define ACPI_SYSTEM_FILE_SLEEP "sleep"
#define ACPI_SYSTEM_FILE_ALARM "alarm"
#define ACPI_SYSTEM_FILE_WAKEUP_DEVICE "wakeup"
#define _COMPONENT ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME ("sleep")
static int acpi_system_sleep_seq_show(struct seq_file *seq, void *offset)
{
int i;
ACPI_FUNCTION_TRACE("acpi_system_sleep_seq_show");
for (i = 0; i <= ACPI_STATE_S5; i++) {
if (sleep_states[i]) {
seq_printf(seq,"S%d ", i);
if (i == ACPI_STATE_S4 && acpi_gbl_FACS->S4bios_f)
seq_printf(seq, "S4bios ");
}
}
seq_puts(seq, "\n");
return 0;
}
static int acpi_system_sleep_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_system_sleep_seq_show, PDE(inode)->data);
}
static ssize_t
acpi_system_write_sleep (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *ppos)
{
char str[12];
u32 state = 0;
int error = 0;
if (count > sizeof(str) - 1)
goto Done;
memset(str,0,sizeof(str));
if (copy_from_user(str, buffer, count))
return -EFAULT;
/* Check for S4 bios request */
if (!strcmp(str,"4b")) {
error = acpi_suspend(4);
goto Done;
}
state = simple_strtoul(str, NULL, 0);
#ifdef CONFIG_SOFTWARE_SUSPEND
if (state == 4) {
error = software_suspend();
goto Done;
}
#endif
error = acpi_suspend(state);
Done:
return error ? error : count;
}
static int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
{
u32 sec, min, hr;
u32 day, mo, yr;
unsigned char rtc_control = 0;
unsigned long flags;
ACPI_FUNCTION_TRACE("acpi_system_alarm_seq_show");
spin_lock_irqsave(&rtc_lock, flags);
sec = CMOS_READ(RTC_SECONDS_ALARM);
min = CMOS_READ(RTC_MINUTES_ALARM);
hr = CMOS_READ(RTC_HOURS_ALARM);
rtc_control = CMOS_READ(RTC_CONTROL);
/* If we ever get an FACP with proper values... */
if (acpi_gbl_FADT->day_alrm)
/* ACPI spec: only low 6 its should be cared */
day = CMOS_READ(acpi_gbl_FADT->day_alrm) & 0x3F;
else
day = CMOS_READ(RTC_DAY_OF_MONTH);
if (acpi_gbl_FADT->mon_alrm)
mo = CMOS_READ(acpi_gbl_FADT->mon_alrm);
else
mo = CMOS_READ(RTC_MONTH);
if (acpi_gbl_FADT->century)
yr = CMOS_READ(acpi_gbl_FADT->century) * 100 + CMOS_READ(RTC_YEAR);
else
yr = CMOS_READ(RTC_YEAR);
spin_unlock_irqrestore(&rtc_lock, flags);
if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
BCD_TO_BIN(sec);
BCD_TO_BIN(min);
BCD_TO_BIN(hr);
BCD_TO_BIN(day);
BCD_TO_BIN(mo);
BCD_TO_BIN(yr);
}
/* we're trusting the FADT (see above)*/
if (!acpi_gbl_FADT->century)
/* If we're not trusting the FADT, we should at least make it
* right for _this_ century... ehm, what is _this_ century?
*
* TBD:
* ASAP: find piece of code in the kernel, e.g. star tracker driver,
* which we can trust to determine the century correctly. Atom
* watch driver would be nice, too...
*
* if that has not happened, change for first release in 2050:
* if (yr<50)
* yr += 2100;
* else
* yr += 2000; // current line of code
*
* if that has not happened either, please do on 2099/12/31:23:59:59
* s/2000/2100
*
*/
yr += 2000;
seq_printf(seq,"%4.4u-", yr);
(mo > 12) ? seq_puts(seq, "**-") : seq_printf(seq, "%2.2u-", mo);
(day > 31) ? seq_puts(seq, "** ") : seq_printf(seq, "%2.2u ", day);
(hr > 23) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", hr);
(min > 59) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", min);
(sec > 59) ? seq_puts(seq, "**\n") : seq_printf(seq, "%2.2u\n", sec);
return 0;
}
static int acpi_system_alarm_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
}
static int
get_date_field (
char **p,
u32 *value)
{
char *next = NULL;
char *string_end = NULL;
int result = -EINVAL;
/*
* Try to find delimeter, only to insert null. The end of the
* string won't have one, but is still valid.
*/
next = strpbrk(*p, "- :");
if (next)
*next++ = '\0';
*value = simple_strtoul(*p, &string_end, 10);
/* Signal success if we got a good digit */
if (string_end != *p)
result = 0;
if (next)
*p = next;
return result;
}
static ssize_t
acpi_system_write_alarm (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *ppos)
{
int result = 0;
char alarm_string[30] = {'\0'};
char *p = alarm_string;
u32 sec, min, hr, day, mo, yr;
int adjust = 0;
unsigned char rtc_control = 0;
ACPI_FUNCTION_TRACE("acpi_system_write_alarm");
if (count > sizeof(alarm_string) - 1)
return_VALUE(-EINVAL);
if (copy_from_user(alarm_string, buffer, count))
return_VALUE(-EFAULT);
alarm_string[count] = '\0';
/* check for time adjustment */
if (alarm_string[0] == '+') {
p++;
adjust = 1;
}
if ((result = get_date_field(&p, &yr)))
goto end;
if ((result = get_date_field(&p, &mo)))
goto end;
if ((result = get_date_field(&p, &day)))
goto end;
if ((result = get_date_field(&p, &hr)))
goto end;
if ((result = get_date_field(&p, &min)))
goto end;
if ((result = get_date_field(&p, &sec)))
goto end;
if (sec > 59) {
min += 1;
sec -= 60;
}
if (min > 59) {
hr += 1;
min -= 60;
}
if (hr > 23) {
day += 1;
hr -= 24;
}
if (day > 31) {
mo += 1;
day -= 31;
}
if (mo > 12) {
yr += 1;
mo -= 12;
}
spin_lock_irq(&rtc_lock);
rtc_control = CMOS_READ(RTC_CONTROL);
if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
BIN_TO_BCD(yr);
BIN_TO_BCD(mo);
BIN_TO_BCD(day);
BIN_TO_BCD(hr);
BIN_TO_BCD(min);
BIN_TO_BCD(sec);
}
if (adjust) {
yr += CMOS_READ(RTC_YEAR);
mo += CMOS_READ(RTC_MONTH);
day += CMOS_READ(RTC_DAY_OF_MONTH);
hr += CMOS_READ(RTC_HOURS);
min += CMOS_READ(RTC_MINUTES);
sec += CMOS_READ(RTC_SECONDS);
}
spin_unlock_irq(&rtc_lock);
if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
BCD_TO_BIN(yr);
BCD_TO_BIN(mo);
BCD_TO_BIN(day);
BCD_TO_BIN(hr);
BCD_TO_BIN(min);
BCD_TO_BIN(sec);
}
if (sec > 59) {
min++;
sec -= 60;
}
if (min > 59) {
hr++;
min -= 60;
}
if (hr > 23) {
day++;
hr -= 24;
}
if (day > 31) {
mo++;
day -= 31;
}
if (mo > 12) {
yr++;
mo -= 12;
}
if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
BIN_TO_BCD(yr);
BIN_TO_BCD(mo);
BIN_TO_BCD(day);
BIN_TO_BCD(hr);
BIN_TO_BCD(min);
BIN_TO_BCD(sec);
}
spin_lock_irq(&rtc_lock);
/*
* Disable alarm interrupt before setting alarm timer or else
* when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
*/
rtc_control &= ~RTC_AIE;
CMOS_WRITE(rtc_control, RTC_CONTROL);
CMOS_READ(RTC_INTR_FLAGS);
/* write the fields the rtc knows about */
CMOS_WRITE(hr, RTC_HOURS_ALARM);
CMOS_WRITE(min, RTC_MINUTES_ALARM);
CMOS_WRITE(sec, RTC_SECONDS_ALARM);
/*
* If the system supports an enhanced alarm it will have non-zero
* offsets into the CMOS RAM here -- which for some reason are pointing
* to the RTC area of memory.
*/
if (acpi_gbl_FADT->day_alrm)
CMOS_WRITE(day, acpi_gbl_FADT->day_alrm);
if (acpi_gbl_FADT->mon_alrm)
CMOS_WRITE(mo, acpi_gbl_FADT->mon_alrm);
if (acpi_gbl_FADT->century)
CMOS_WRITE(yr/100, acpi_gbl_FADT->century);
/* enable the rtc alarm interrupt */
rtc_control |= RTC_AIE;
CMOS_WRITE(rtc_control, RTC_CONTROL);
CMOS_READ(RTC_INTR_FLAGS);
spin_unlock_irq(&rtc_lock);
acpi_clear_event(ACPI_EVENT_RTC);
acpi_enable_event(ACPI_EVENT_RTC, 0);
*ppos += count;
result = 0;
end:
return_VALUE(result ? result : count);
}
extern struct list_head acpi_wakeup_device_list;
extern spinlock_t acpi_device_lock;
static int
acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
{
struct list_head * node, * next;
seq_printf(seq, "Device Sleep state Status\n");
spin_lock(&acpi_device_lock);
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
struct acpi_device * dev = container_of(node, struct acpi_device, wakeup_list);
if (!dev->wakeup.flags.valid)
continue;
spin_unlock(&acpi_device_lock);
if (dev->wakeup.flags.run_wake)
seq_printf(seq, "%4s %4d %8s\n",
dev->pnp.bus_id, (u32) dev->wakeup.sleep_state,
dev->wakeup.state.enabled ? "*enabled" : "*disabled");
else
seq_printf(seq, "%4s %4d %8s\n",
dev->pnp.bus_id, (u32) dev->wakeup.sleep_state,
dev->wakeup.state.enabled ? "enabled" : "disabled");
spin_lock(&acpi_device_lock);
}
spin_unlock(&acpi_device_lock);
return 0;
}
static ssize_t
acpi_system_write_wakeup_device (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *ppos)
{
struct list_head * node, * next;
char strbuf[5];
char str[5] = "";
int len = count;
struct acpi_device *found_dev = NULL;
if (len > 4) len = 4;
if (copy_from_user(strbuf, buffer, len))
return -EFAULT;
strbuf[len] = '\0';
sscanf(strbuf, "%s", str);
spin_lock(&acpi_device_lock);
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
struct acpi_device * dev = container_of(node, struct acpi_device, wakeup_list);
if (!dev->wakeup.flags.valid)
continue;
if (!strncmp(dev->pnp.bus_id, str, 4)) {
dev->wakeup.state.enabled = dev->wakeup.state.enabled ? 0:1;
found_dev = dev;
break;
}
}
if (found_dev) {
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
struct acpi_device * dev = container_of(node,
struct acpi_device, wakeup_list);
if ((dev != found_dev) &&
(dev->wakeup.gpe_number == found_dev->wakeup.gpe_number) &&
(dev->wakeup.gpe_device == found_dev->wakeup.gpe_device)) {
printk(KERN_WARNING "ACPI: '%s' and '%s' have the same GPE, "
"can't disable/enable one seperately\n",
dev->pnp.bus_id, found_dev->pnp.bus_id);
dev->wakeup.state.enabled = found_dev->wakeup.state.enabled;
}
}
}
spin_unlock(&acpi_device_lock);
return count;
}
static int
acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_system_wakeup_device_seq_show, PDE(inode)->data);
}
static struct file_operations acpi_system_wakeup_device_fops = {
.open = acpi_system_wakeup_device_open_fs,
.read = seq_read,
.write = acpi_system_write_wakeup_device,
.llseek = seq_lseek,
.release = single_release,
};
static struct file_operations acpi_system_sleep_fops = {
.open = acpi_system_sleep_open_fs,
.read = seq_read,
.write = acpi_system_write_sleep,
.llseek = seq_lseek,
.release = single_release,
};
static struct file_operations acpi_system_alarm_fops = {
.open = acpi_system_alarm_open_fs,
.read = seq_read,
.write = acpi_system_write_alarm,
.llseek = seq_lseek,
.release = single_release,
};
static u32 rtc_handler(void * context)
{
acpi_clear_event(ACPI_EVENT_RTC);
acpi_disable_event(ACPI_EVENT_RTC, 0);
return ACPI_INTERRUPT_HANDLED;
}
static int acpi_sleep_proc_init(void)
{
struct proc_dir_entry *entry = NULL;
if (acpi_disabled)
return 0;
/* 'sleep' [R/W]*/
entry = create_proc_entry(ACPI_SYSTEM_FILE_SLEEP,
S_IFREG|S_IRUGO|S_IWUSR, acpi_root_dir);
if (entry)
entry->proc_fops = &acpi_system_sleep_fops;
/* 'alarm' [R/W] */
entry = create_proc_entry(ACPI_SYSTEM_FILE_ALARM,
S_IFREG|S_IRUGO|S_IWUSR, acpi_root_dir);
if (entry)
entry->proc_fops = &acpi_system_alarm_fops;
/* 'wakeup device' [R/W]*/
entry = create_proc_entry(ACPI_SYSTEM_FILE_WAKEUP_DEVICE,
S_IFREG|S_IRUGO|S_IWUSR, acpi_root_dir);
if (entry)
entry->proc_fops = &acpi_system_wakeup_device_fops;
acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
return 0;
}
late_initcall(acpi_sleep_proc_init);
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