[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / sleep / proc.c

#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 _COMPONENT		ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("sleep")
#ifdef	CONFIG_ACPI_SLEEP_PROC_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);
		}
	}

	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 = pm_suspend(PM_SUSPEND_DISK);
		goto Done;
	}
#endif
	error = acpi_suspend(state);
      Done:
	return error ? error : count;
}
#endif				/* CONFIG_ACPI_SLEEP_PROC_SLEEP */

#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
/* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
#else
#define	HAVE_ACPI_LEGACY_ALARM
#endif

#ifdef	HAVE_ACPI_LEGACY_ALARM

static int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
{
	u32 sec, min, hr;
	u32 day, mo, yr, cent = 0;
	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_alarm)
		/* ACPI spec: only low 6 its should be cared */
		day = CMOS_READ(acpi_gbl_FADT.day_alarm) & 0x3F;
	else
		day = CMOS_READ(RTC_DAY_OF_MONTH);
	if (acpi_gbl_FADT.month_alarm)
		mo = CMOS_READ(acpi_gbl_FADT.month_alarm);
	else
		mo = CMOS_READ(RTC_MONTH);
	if (acpi_gbl_FADT.century)
		cent = CMOS_READ(acpi_gbl_FADT.century);

	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);
		BCD_TO_BIN(cent);
	}

	/* 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;
	else
		yr += cent * 100;

	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_alarm)
		CMOS_WRITE(day, acpi_gbl_FADT.day_alarm);
	if (acpi_gbl_FADT.month_alarm)
		CMOS_WRITE(mo, acpi_gbl_FADT.month_alarm);
	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);
}
#endif	/* HAVE_ACPI_LEGACY_ALARM */


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\tS-state\t  Status   Sysfs node\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);
		struct device *ldev;

		if (!dev->wakeup.flags.valid)
			continue;
		spin_unlock(&acpi_device_lock);

		ldev = acpi_get_physical_device(dev->handle);
		seq_printf(seq, "%s\t  S%d\t%c%-8s  ",
			   dev->pnp.bus_id,
			   (u32) dev->wakeup.sleep_state,
			   dev->wakeup.flags.run_wake ? '*' : ' ',
			   dev->wakeup.state.enabled ? "enabled" : "disabled");
		if (ldev)
			seq_printf(seq, "%s:%s",
				ldev->bus ? ldev->bus->name : "no-bus",
				ldev->bus_id);
		seq_printf(seq, "\n");
		put_device(ldev);

		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 const 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,
};

#ifdef	CONFIG_ACPI_SLEEP_PROC_SLEEP
static const 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,
};
#endif				/* CONFIG_ACPI_SLEEP_PROC_SLEEP */

#ifdef	HAVE_ACPI_LEGACY_ALARM
static const 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;
}
#endif	/* HAVE_ACPI_LEGACY_ALARM */

static int __init acpi_sleep_proc_init(void)
{
	struct proc_dir_entry *entry = NULL;

	if (acpi_disabled)
		return 0;

#ifdef	CONFIG_ACPI_SLEEP_PROC_SLEEP
	/* 'sleep' [R/W] */
	entry =
	    create_proc_entry("sleep", S_IFREG | S_IRUGO | S_IWUSR,
			      acpi_root_dir);
	if (entry)
		entry->proc_fops = &acpi_system_sleep_fops;
#endif

#ifdef	HAVE_ACPI_LEGACY_ALARM
	/* 'alarm' [R/W] */
	entry =
	    create_proc_entry("alarm", S_IFREG | S_IRUGO | S_IWUSR,
			      acpi_root_dir);
	if (entry)
		entry->proc_fops = &acpi_system_alarm_fops;

	acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
#endif	/* HAVE_ACPI_LEGACY_ALARM */

	/* 'wakeup device' [R/W] */
	entry =
	    create_proc_entry("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
			      acpi_root_dir);
	if (entry)
		entry->proc_fops = &acpi_system_wakeup_device_fops;

	return 0;
}

late_initcall(acpi_sleep_proc_init);
Commit	Line	Data
1da177e4 LT	1	#include <linux/proc_fs.h>
	2	#include <linux/seq_file.h>
	3	#include <linux/suspend.h>
	4	#include <linux/bcd.h>
	5	#include <asm/uaccess.h>
	6
	7	#include <acpi/acpi_bus.h>
	8	#include <acpi/acpi_drivers.h>
	9
	10	#ifdef CONFIG_X86
	11	#include <linux/mc146818rtc.h>
	12	#endif
	13
	14	#include "sleep.h"
	15
1da177e4	16	#define _COMPONENT ACPI_SYSTEM_COMPONENT
4be44fcd	17	ACPI_MODULE_NAME("sleep")
ebb6e1a6	18	#ifdef CONFIG_ACPI_SLEEP_PROC_SLEEP
1da177e4 LT	19	static int acpi_system_sleep_seq_show(struct seq_file seq, void offset)
1da177e4 LT	20	{
4be44fcd	21	int i;
1da177e4 LT	22
	23	ACPI_FUNCTION_TRACE("acpi_system_sleep_seq_show");
	24
	25	for (i = 0; i <= ACPI_STATE_S5; i++) {
	26	if (sleep_states[i]) {
4be44fcd	27	seq_printf(seq, "S%d ", i);
1da177e4 LT	28	}
	29	}
	30
	31	seq_puts(seq, "\n");
	32
	33	return 0;
	34	}
	35
	36	static int acpi_system_sleep_open_fs(struct inode inode, struct file file)
	37	{
	38	return single_open(file, acpi_system_sleep_seq_show, PDE(inode)->data);
	39	}
	40
	41	static ssize_t
4be44fcd LB	42	acpi_system_write_sleep(struct file *file,
4be44fcd LB	43	const char __user * buffer, size_t count, loff_t * ppos)
1da177e4	44	{
4be44fcd LB	45	char str[12];
	46	u32 state = 0;
	47	int error = 0;
1da177e4 LT	48
	49	if (count > sizeof(str) - 1)
	50	goto Done;
4be44fcd	51	memset(str, 0, sizeof(str));
1da177e4 LT	52	if (copy_from_user(str, buffer, count))
	53	return -EFAULT;
	54
	55	/* Check for S4 bios request */
4be44fcd	56	if (!strcmp(str, "4b")) {
1da177e4 LT	57	error = acpi_suspend(4);
	58	goto Done;
	59	}
	60	state = simple_strtoul(str, NULL, 0);
	61	#ifdef CONFIG_SOFTWARE_SUSPEND
	62	if (state == 4) {
ab3bfca7	63	error = pm_suspend(PM_SUSPEND_DISK);
1da177e4 LT	64	goto Done;
	65	}
	66	#endif
	67	error = acpi_suspend(state);
4be44fcd	68	Done:
1da177e4 LT	69	return error ? error : count;
1da177e4 LT	70	}
4be44fcd	71	#endif /* CONFIG_ACPI_SLEEP_PROC_SLEEP */
1da177e4	72
f5f72b46 DB	73	#if defined(CONFIG_RTC_DRV_CMOS) \|\| defined(CONFIG_RTC_DRV_CMOS_MODULE)
	74	/* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
	75	#else
	76	#define HAVE_ACPI_LEGACY_ALARM
	77	#endif
	78
	79	#ifdef HAVE_ACPI_LEGACY_ALARM
	80
1da177e4 LT	81	static int acpi_system_alarm_seq_show(struct seq_file seq, void offset)
1da177e4 LT	82	{
4be44fcd	83	u32 sec, min, hr;
ad71860a	84	u32 day, mo, yr, cent = 0;
4be44fcd LB	85	unsigned char rtc_control = 0;
4be44fcd LB	86	unsigned long flags;
1da177e4 LT	87
	88	ACPI_FUNCTION_TRACE("acpi_system_alarm_seq_show");
	89
	90	spin_lock_irqsave(&rtc_lock, flags);
	91
	92	sec = CMOS_READ(RTC_SECONDS_ALARM);
	93	min = CMOS_READ(RTC_MINUTES_ALARM);
	94	hr = CMOS_READ(RTC_HOURS_ALARM);
	95	rtc_control = CMOS_READ(RTC_CONTROL);
	96
	97	/* If we ever get an FACP with proper values... */
ad71860a	98	if (acpi_gbl_FADT.day_alarm)
1da177e4	99	/* ACPI spec: only low 6 its should be cared */
ad71860a	100	day = CMOS_READ(acpi_gbl_FADT.day_alarm) & 0x3F;
1da177e4	101	else
4be44fcd	102	day = CMOS_READ(RTC_DAY_OF_MONTH);
ad71860a AS	103	if (acpi_gbl_FADT.month_alarm)
ad71860a AS	104	mo = CMOS_READ(acpi_gbl_FADT.month_alarm);
1da177e4 LT	105	else
1da177e4 LT	106	mo = CMOS_READ(RTC_MONTH);
ad71860a AS	107	if (acpi_gbl_FADT.century)
	108	cent = CMOS_READ(acpi_gbl_FADT.century);
	109
	110	yr = CMOS_READ(RTC_YEAR);
1da177e4 LT	111
	112	spin_unlock_irqrestore(&rtc_lock, flags);
	113
	114	if (!(rtc_control & RTC_DM_BINARY) \|\| RTC_ALWAYS_BCD) {
	115	BCD_TO_BIN(sec);
	116	BCD_TO_BIN(min);
	117	BCD_TO_BIN(hr);
	118	BCD_TO_BIN(day);
	119	BCD_TO_BIN(mo);
	120	BCD_TO_BIN(yr);
ad71860a	121	BCD_TO_BIN(cent);
1da177e4 LT	122	}
1da177e4 LT	123
4be44fcd	124	/* we're trusting the FADT (see above) */
ad71860a	125	if (!acpi_gbl_FADT.century)
4be44fcd LB	126	/* If we're not trusting the FADT, we should at least make it
	127	* right for _this_ century... ehm, what is _this_ century?
	128	*
	129	* TBD:
	130	* ASAP: find piece of code in the kernel, e.g. star tracker driver,
	131	* which we can trust to determine the century correctly. Atom
	132	* watch driver would be nice, too...
	133	*
	134	* if that has not happened, change for first release in 2050:
	135	* if (yr<50)
	136	* yr += 2100;
	137	* else
	138	* yr += 2000; // current line of code
	139	*
	140	* if that has not happened either, please do on 2099/12/31:23:59:59
	141	* s/2000/2100
	142	*
	143	*/
1da177e4	144	yr += 2000;
ad71860a AS	145	else
ad71860a AS	146	yr += cent * 100;
1da177e4	147
4be44fcd LB	148	seq_printf(seq, "%4.4u-", yr);
	149	(mo > 12) ? seq_puts(seq, "**-") : seq_printf(seq, "%2.2u-", mo);
	150	(day > 31) ? seq_puts(seq, "** ") : seq_printf(seq, "%2.2u ", day);
	151	(hr > 23) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", hr);
	152	(min > 59) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", min);
1da177e4 LT	153	(sec > 59) ? seq_puts(seq, "**\n") : seq_printf(seq, "%2.2u\n", sec);
	154
	155	return 0;
	156	}
	157
	158	static int acpi_system_alarm_open_fs(struct inode inode, struct file file)
	159	{
	160	return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
	161	}
	162
4be44fcd	163	static int get_date_field(char *p, u32 value)
1da177e4	164	{
4be44fcd LB	165	char *next = NULL;
	166	char *string_end = NULL;
	167	int result = -EINVAL;
1da177e4 LT	168
	169	/*
	170	* Try to find delimeter, only to insert null. The end of the
	171	* string won't have one, but is still valid.
	172	*/
	173	next = strpbrk(*p, "- :");
	174	if (next)
	175	*next++ = '\0';
	176
	177	value = simple_strtoul(p, &string_end, 10);
	178
	179	/* Signal success if we got a good digit */
	180	if (string_end != *p)
	181	result = 0;
	182
	183	if (next)
	184	*p = next;
	185
	186	return result;
	187	}
	188
1da177e4	189	static ssize_t
4be44fcd LB	190	acpi_system_write_alarm(struct file *file,
4be44fcd LB	191	const char __user * buffer, size_t count, loff_t * ppos)
1da177e4	192	{
4be44fcd LB	193	int result = 0;
	194	char alarm_string[30] = { '\0' };
	195	char *p = alarm_string;
	196	u32 sec, min, hr, day, mo, yr;
	197	int adjust = 0;
	198	unsigned char rtc_control = 0;
1da177e4 LT	199
	200	ACPI_FUNCTION_TRACE("acpi_system_write_alarm");
	201
	202	if (count > sizeof(alarm_string) - 1)
	203	return_VALUE(-EINVAL);
4be44fcd	204
1da177e4 LT	205	if (copy_from_user(alarm_string, buffer, count))
	206	return_VALUE(-EFAULT);
	207
	208	alarm_string[count] = '\0';
	209
	210	/* check for time adjustment */
	211	if (alarm_string[0] == '+') {
	212	p++;
	213	adjust = 1;
	214	}
	215
	216	if ((result = get_date_field(&p, &yr)))
	217	goto end;
	218	if ((result = get_date_field(&p, &mo)))
	219	goto end;
	220	if ((result = get_date_field(&p, &day)))
	221	goto end;
	222	if ((result = get_date_field(&p, &hr)))
	223	goto end;
	224	if ((result = get_date_field(&p, &min)))
	225	goto end;
	226	if ((result = get_date_field(&p, &sec)))
	227	goto end;
	228
	229	if (sec > 59) {
	230	min += 1;
	231	sec -= 60;
	232	}
	233	if (min > 59) {
	234	hr += 1;
	235	min -= 60;
	236	}
	237	if (hr > 23) {
	238	day += 1;
	239	hr -= 24;
	240	}
	241	if (day > 31) {
	242	mo += 1;
	243	day -= 31;
	244	}
	245	if (mo > 12) {
	246	yr += 1;
	247	mo -= 12;
	248	}
	249
	250	spin_lock_irq(&rtc_lock);
	251
	252	rtc_control = CMOS_READ(RTC_CONTROL);
	253	if (!(rtc_control & RTC_DM_BINARY) \|\| RTC_ALWAYS_BCD) {
	254	BIN_TO_BCD(yr);
	255	BIN_TO_BCD(mo);
	256	BIN_TO_BCD(day);
	257	BIN_TO_BCD(hr);
	258	BIN_TO_BCD(min);
	259	BIN_TO_BCD(sec);
	260	}
	261
	262	if (adjust) {
4be44fcd LB	263	yr += CMOS_READ(RTC_YEAR);
4be44fcd LB	264	mo += CMOS_READ(RTC_MONTH);
1da177e4	265	day += CMOS_READ(RTC_DAY_OF_MONTH);
4be44fcd	266	hr += CMOS_READ(RTC_HOURS);
1da177e4 LT	267	min += CMOS_READ(RTC_MINUTES);
	268	sec += CMOS_READ(RTC_SECONDS);
	269	}
	270
	271	spin_unlock_irq(&rtc_lock);
	272
	273	if (!(rtc_control & RTC_DM_BINARY) \|\| RTC_ALWAYS_BCD) {
	274	BCD_TO_BIN(yr);
	275	BCD_TO_BIN(mo);
	276	BCD_TO_BIN(day);
	277	BCD_TO_BIN(hr);
	278	BCD_TO_BIN(min);
	279	BCD_TO_BIN(sec);
	280	}
	281
	282	if (sec > 59) {
	283	min++;
	284	sec -= 60;
	285	}
	286	if (min > 59) {
	287	hr++;
	288	min -= 60;
	289	}
	290	if (hr > 23) {
	291	day++;
	292	hr -= 24;
	293	}
	294	if (day > 31) {
	295	mo++;
	296	day -= 31;
	297	}
	298	if (mo > 12) {
	299	yr++;
	300	mo -= 12;
	301	}
	302	if (!(rtc_control & RTC_DM_BINARY) \|\| RTC_ALWAYS_BCD) {
	303	BIN_TO_BCD(yr);
	304	BIN_TO_BCD(mo);
	305	BIN_TO_BCD(day);
	306	BIN_TO_BCD(hr);
	307	BIN_TO_BCD(min);
	308	BIN_TO_BCD(sec);
	309	}
	310
	311	spin_lock_irq(&rtc_lock);
	312	/*
	313	* Disable alarm interrupt before setting alarm timer or else
	314	* when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
	315	*/
	316	rtc_control &= ~RTC_AIE;
	317	CMOS_WRITE(rtc_control, RTC_CONTROL);
	318	CMOS_READ(RTC_INTR_FLAGS);
	319
	320	/* write the fields the rtc knows about */
	321	CMOS_WRITE(hr, RTC_HOURS_ALARM);
	322	CMOS_WRITE(min, RTC_MINUTES_ALARM);
	323	CMOS_WRITE(sec, RTC_SECONDS_ALARM);
	324
	325	/*
	326	* If the system supports an enhanced alarm it will have non-zero
	327	* offsets into the CMOS RAM here -- which for some reason are pointing
	328	* to the RTC area of memory.
	329	*/
ad71860a AS	330	if (acpi_gbl_FADT.day_alarm)
	331	CMOS_WRITE(day, acpi_gbl_FADT.day_alarm);
	332	if (acpi_gbl_FADT.month_alarm)
	333	CMOS_WRITE(mo, acpi_gbl_FADT.month_alarm);
	334	if (acpi_gbl_FADT.century)
	335	CMOS_WRITE(yr / 100, acpi_gbl_FADT.century);
1da177e4 LT	336	/* enable the rtc alarm interrupt */
	337	rtc_control \|= RTC_AIE;
	338	CMOS_WRITE(rtc_control, RTC_CONTROL);
	339	CMOS_READ(RTC_INTR_FLAGS);
	340
	341	spin_unlock_irq(&rtc_lock);
	342
	343	acpi_clear_event(ACPI_EVENT_RTC);
	344	acpi_enable_event(ACPI_EVENT_RTC, 0);
	345
	346	*ppos += count;
	347
	348	result = 0;
4be44fcd	349	end:
1da177e4 LT	350	return_VALUE(result ? result : count);
1da177e4 LT	351	}
f5f72b46 DB	352	#endif /* HAVE_ACPI_LEGACY_ALARM */
f5f72b46 DB	353
1da177e4	354
4be44fcd	355	extern struct list_head acpi_wakeup_device_list;
1da177e4 LT	356	extern spinlock_t acpi_device_lock;
	357
	358	static int
	359	acpi_system_wakeup_device_seq_show(struct seq_file seq, void offset)
	360	{
4be44fcd	361	struct list_head node, next;
1da177e4	362
8aa55591	363	seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
1da177e4 LT	364
	365	spin_lock(&acpi_device_lock);
	366	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
4be44fcd LB	367	struct acpi_device *dev =
4be44fcd LB	368	container_of(node, struct acpi_device, wakeup_list);
8aa55591	369	struct device *ldev;
1da177e4 LT	370
	371	if (!dev->wakeup.flags.valid)
	372	continue;
	373	spin_unlock(&acpi_device_lock);
8aa55591 DB	374
	375	ldev = acpi_get_physical_device(dev->handle);
	376	seq_printf(seq, "%s\t S%d\t%c%-8s ",
4be44fcd LB	377	dev->pnp.bus_id,
4be44fcd LB	378	(u32) dev->wakeup.sleep_state,
8aa55591	379	dev->wakeup.flags.run_wake ? '*' : ' ',
c65ade4d	380	dev->wakeup.state.enabled ? "enabled" : "disabled");
8aa55591 DB	381	if (ldev)
	382	seq_printf(seq, "%s:%s",
	383	ldev->bus ? ldev->bus->name : "no-bus",
	384	ldev->bus_id);
	385	seq_printf(seq, "\n");
	386	put_device(ldev);
	387
1da177e4 LT	388	spin_lock(&acpi_device_lock);
	389	}
	390	spin_unlock(&acpi_device_lock);
	391	return 0;
	392	}
	393
	394	static ssize_t
4be44fcd LB	395	acpi_system_write_wakeup_device(struct file *file,
	396	const char __user * buffer,
	397	size_t count, loff_t * ppos)
1da177e4	398	{
4be44fcd LB	399	struct list_head node, next;
	400	char strbuf[5];
	401	char str[5] = "";
	402	int len = count;
1da177e4 LT	403	struct acpi_device *found_dev = NULL;
1da177e4 LT	404
4be44fcd LB	405	if (len > 4)
4be44fcd LB	406	len = 4;
1da177e4 LT	407
	408	if (copy_from_user(strbuf, buffer, len))
	409	return -EFAULT;
	410	strbuf[len] = '\0';
	411	sscanf(strbuf, "%s", str);
	412
	413	spin_lock(&acpi_device_lock);
	414	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
4be44fcd LB	415	struct acpi_device *dev =
4be44fcd LB	416	container_of(node, struct acpi_device, wakeup_list);
1da177e4 LT	417	if (!dev->wakeup.flags.valid)
	418	continue;
	419
	420	if (!strncmp(dev->pnp.bus_id, str, 4)) {
4be44fcd LB	421	dev->wakeup.state.enabled =
4be44fcd LB	422	dev->wakeup.state.enabled ? 0 : 1;
1da177e4 LT	423	found_dev = dev;
	424	break;
	425	}
	426	}
	427	if (found_dev) {
	428	list_for_each_safe(node, next, &acpi_wakeup_device_list) {
4be44fcd LB	429	struct acpi_device *dev = container_of(node,
	430	struct
	431	acpi_device,
	432	wakeup_list);
1da177e4 LT	433
1da177e4 LT	434	if ((dev != found_dev) &&
4be44fcd LB	435	(dev->wakeup.gpe_number ==
	436	found_dev->wakeup.gpe_number)
	437	&& (dev->wakeup.gpe_device ==
	438	found_dev->wakeup.gpe_device)) {
	439	printk(KERN_WARNING
	440	"ACPI: '%s' and '%s' have the same GPE, "
	441	"can't disable/enable one seperately\n",
	442	dev->pnp.bus_id, found_dev->pnp.bus_id);
	443	dev->wakeup.state.enabled =
	444	found_dev->wakeup.state.enabled;
1da177e4 LT	445	}
	446	}
	447	}
	448	spin_unlock(&acpi_device_lock);
	449	return count;
	450	}
	451
	452	static int
	453	acpi_system_wakeup_device_open_fs(struct inode inode, struct file file)
	454	{
4be44fcd LB	455	return single_open(file, acpi_system_wakeup_device_seq_show,
4be44fcd LB	456	PDE(inode)->data);
1da177e4 LT	457	}
1da177e4 LT	458
d7508032	459	static const struct file_operations acpi_system_wakeup_device_fops = {
4be44fcd LB	460	.open = acpi_system_wakeup_device_open_fs,
	461	.read = seq_read,
	462	.write = acpi_system_write_wakeup_device,
	463	.llseek = seq_lseek,
	464	.release = single_release,
1da177e4 LT	465	};
1da177e4 LT	466
ebb6e1a6	467	#ifdef CONFIG_ACPI_SLEEP_PROC_SLEEP
d7508032	468	static const struct file_operations acpi_system_sleep_fops = {
4be44fcd LB	469	.open = acpi_system_sleep_open_fs,
	470	.read = seq_read,
	471	.write = acpi_system_write_sleep,
	472	.llseek = seq_lseek,
	473	.release = single_release,
1da177e4	474	};
4be44fcd	475	#endif /* CONFIG_ACPI_SLEEP_PROC_SLEEP */
1da177e4	476
f5f72b46	477	#ifdef HAVE_ACPI_LEGACY_ALARM
d7508032	478	static const struct file_operations acpi_system_alarm_fops = {
4be44fcd LB	479	.open = acpi_system_alarm_open_fs,
	480	.read = seq_read,
	481	.write = acpi_system_write_alarm,
	482	.llseek = seq_lseek,
	483	.release = single_release,
1da177e4 LT	484	};
1da177e4 LT	485
4be44fcd	486	static u32 rtc_handler(void *context)
1da177e4 LT	487	{
	488	acpi_clear_event(ACPI_EVENT_RTC);
	489	acpi_disable_event(ACPI_EVENT_RTC, 0);
	490
	491	return ACPI_INTERRUPT_HANDLED;
	492	}
f5f72b46	493	#endif /* HAVE_ACPI_LEGACY_ALARM */
1da177e4	494
f5f72b46	495	static int __init acpi_sleep_proc_init(void)
1da177e4	496	{
c65ade4d	497	struct proc_dir_entry *entry = NULL;
1da177e4 LT	498
	499	if (acpi_disabled)
	500	return 0;
4be44fcd	501
ebb6e1a6	502	#ifdef CONFIG_ACPI_SLEEP_PROC_SLEEP
c65ade4d	503	/* 'sleep' [R/W] */
4be44fcd LB	504	entry =
	505	create_proc_entry("sleep", S_IFREG \| S_IRUGO \| S_IWUSR,
	506	acpi_root_dir);
1da177e4 LT	507	if (entry)
1da177e4 LT	508	entry->proc_fops = &acpi_system_sleep_fops;
ebb6e1a6	509	#endif
1da177e4	510
f5f72b46	511	#ifdef HAVE_ACPI_LEGACY_ALARM
1da177e4	512	/* 'alarm' [R/W] */
4be44fcd LB	513	entry =
	514	create_proc_entry("alarm", S_IFREG \| S_IRUGO \| S_IWUSR,
	515	acpi_root_dir);
1da177e4 LT	516	if (entry)
	517	entry->proc_fops = &acpi_system_alarm_fops;
	518
f5f72b46 DB	519	acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
	520	#endif /* HAVE_ACPI_LEGACY_ALARM */
	521
c65ade4d	522	/* 'wakeup device' [R/W] */
4be44fcd LB	523	entry =
	524	create_proc_entry("wakeup", S_IFREG \| S_IRUGO \| S_IWUSR,
	525	acpi_root_dir);
1da177e4 LT	526	if (entry)
	527	entry->proc_fops = &acpi_system_wakeup_device_fops;
	528
1da177e4 LT	529	return 0;
	530	}
	531
	532	late_initcall(acpi_sleep_proc_init);