[net-next-2.6.git] / kernel / power / disk.c

/*
 * kernel/power/disk.c - Suspend-to-disk support.
 *
 * Copyright (c) 2003 Patrick Mochel
 * Copyright (c) 2003 Open Source Development Lab
 * Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
 *
 * This file is released under the GPLv2.
 *
 */

#include <linux/suspend.h>
#include <linux/syscalls.h>
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pm.h>
#include <linux/console.h>
#include <linux/cpu.h>

#include "power.h"


static int noresume = 0;
char resume_file[256] = CONFIG_PM_STD_PARTITION;
dev_t swsusp_resume_device;

/**
 *	power_down - Shut machine down for hibernate.
 *	@mode:		Suspend-to-disk mode
 *
 *	Use the platform driver, if configured so, and return gracefully if it
 *	fails.
 *	Otherwise, try to power off and reboot. If they fail, halt the machine,
 *	there ain't no turning back.
 */

static void power_down(suspend_disk_method_t mode)
{
	int error = 0;

	switch(mode) {
	case PM_DISK_PLATFORM:
		kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
		error = pm_ops->enter(PM_SUSPEND_DISK);
		break;
	case PM_DISK_SHUTDOWN:
		kernel_power_off();
		break;
	case PM_DISK_REBOOT:
		kernel_restart(NULL);
		break;
	}
	kernel_halt();
	/* Valid image is on the disk, if we continue we risk serious data corruption
	   after resume. */
	printk(KERN_CRIT "Please power me down manually\n");
	while(1);
}

static inline void platform_finish(void)
{
	if (pm_disk_mode == PM_DISK_PLATFORM) {
		if (pm_ops && pm_ops->finish)
			pm_ops->finish(PM_SUSPEND_DISK);
	}
}

static int prepare_processes(void)
{
	int error = 0;

	pm_prepare_console();

	error = disable_nonboot_cpus();
	if (error)
		goto enable_cpus;

	if (freeze_processes()) {
		error = -EBUSY;
		goto thaw;
	}

	if (pm_disk_mode == PM_DISK_TESTPROC) {
		printk("swsusp debug: Waiting for 5 seconds.\n");
		mdelay(5000);
		goto thaw;
	}

	/* Free memory before shutting down devices. */
	if (!(error = swsusp_shrink_memory()))
		return 0;
thaw:
	thaw_processes();
enable_cpus:
	enable_nonboot_cpus();
	pm_restore_console();
	return error;
}

static void unprepare_processes(void)
{
	platform_finish();
	thaw_processes();
	enable_nonboot_cpus();
	pm_restore_console();
}

/**
 *	pm_suspend_disk - The granpappy of hibernation power management.
 *
 *	If we're going through the firmware, then get it over with quickly.
 *
 *	If not, then call swsusp to do its thing, then figure out how
 *	to power down the system.
 */

int pm_suspend_disk(void)
{
	int error;

	error = prepare_processes();
	if (error)
		return error;

	if (pm_disk_mode == PM_DISK_TESTPROC)
		goto Thaw;

	suspend_console();
	error = device_suspend(PMSG_FREEZE);
	if (error) {
		resume_console();
		printk("Some devices failed to suspend\n");
		goto Thaw;
	}

	if (pm_disk_mode == PM_DISK_TEST) {
		printk("swsusp debug: Waiting for 5 seconds.\n");
		mdelay(5000);
		goto Done;
	}

	pr_debug("PM: snapshotting memory.\n");
	in_suspend = 1;
	if ((error = swsusp_suspend()))
		goto Done;

	if (in_suspend) {
		device_resume();
		resume_console();
		pr_debug("PM: writing image.\n");
		error = swsusp_write();
		if (!error)
			power_down(pm_disk_mode);
		else {
			swsusp_free();
			goto Thaw;
		}
	} else {
		pr_debug("PM: Image restored successfully.\n");
	}

	swsusp_free();
 Done:
	device_resume();
	resume_console();
 Thaw:
	unprepare_processes();
	return error;
}


/**
 *	software_resume - Resume from a saved image.
 *
 *	Called as a late_initcall (so all devices are discovered and
 *	initialized), we call swsusp to see if we have a saved image or not.
 *	If so, we quiesce devices, the restore the saved image. We will
 *	return above (in pm_suspend_disk() ) if everything goes well.
 *	Otherwise, we fail gracefully and return to the normally
 *	scheduled program.
 *
 */

static int software_resume(void)
{
	int error;

	down(&pm_sem);
	if (!swsusp_resume_device) {
		if (!strlen(resume_file)) {
			up(&pm_sem);
			return -ENOENT;
		}
		swsusp_resume_device = name_to_dev_t(resume_file);
		pr_debug("swsusp: Resume From Partition %s\n", resume_file);
	} else {
		pr_debug("swsusp: Resume From Partition %d:%d\n",
			 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
	}

	if (noresume) {
		/**
		 * FIXME: If noresume is specified, we need to find the partition
		 * and reset it back to normal swap space.
		 */
		up(&pm_sem);
		return 0;
	}

	pr_debug("PM: Checking swsusp image.\n");

	if ((error = swsusp_check()))
		goto Done;

	pr_debug("PM: Preparing processes for restore.\n");

	if ((error = prepare_processes())) {
		swsusp_close();
		goto Done;
	}

	pr_debug("PM: Reading swsusp image.\n");

	if ((error = swsusp_read())) {
		swsusp_free();
		goto Thaw;
	}

	pr_debug("PM: Preparing devices for restore.\n");

	suspend_console();
	if ((error = device_suspend(PMSG_PRETHAW))) {
		resume_console();
		printk("Some devices failed to suspend\n");
		swsusp_free();
		goto Thaw;
	}

	mb();

	pr_debug("PM: Restoring saved image.\n");
	swsusp_resume();
	pr_debug("PM: Restore failed, recovering.n");
	device_resume();
	resume_console();
 Thaw:
	unprepare_processes();
 Done:
	/* For success case, the suspend path will release the lock */
	up(&pm_sem);
	pr_debug("PM: Resume from disk failed.\n");
	return 0;
}

late_initcall(software_resume);


static const char * const pm_disk_modes[] = {
	[PM_DISK_FIRMWARE]	= "firmware",
	[PM_DISK_PLATFORM]	= "platform",
	[PM_DISK_SHUTDOWN]	= "shutdown",
	[PM_DISK_REBOOT]	= "reboot",
	[PM_DISK_TEST]		= "test",
	[PM_DISK_TESTPROC]	= "testproc",
};

/**
 *	disk - Control suspend-to-disk mode
 *
 *	Suspend-to-disk can be handled in several ways. The greatest
 *	distinction is who writes memory to disk - the firmware or the OS.
 *	If the firmware does it, we assume that it also handles suspending
 *	the system.
 *	If the OS does it, then we have three options for putting the system
 *	to sleep - using the platform driver (e.g. ACPI or other PM registers),
 *	powering off the system or rebooting the system (for testing).
 *
 *	The system will support either 'firmware' or 'platform', and that is
 *	known a priori (and encoded in pm_ops). But, the user may choose
 *	'shutdown' or 'reboot' as alternatives.
 *
 *	show() will display what the mode is currently set to.
 *	store() will accept one of
 *
 *	'firmware'
 *	'platform'
 *	'shutdown'
 *	'reboot'
 *
 *	It will only change to 'firmware' or 'platform' if the system
 *	supports it (as determined from pm_ops->pm_disk_mode).
 */

static ssize_t disk_show(struct subsystem * subsys, char * buf)
{
	return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
}


static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
{
	int error = 0;
	int i;
	int len;
	char *p;
	suspend_disk_method_t mode = 0;

	p = memchr(buf, '\n', n);
	len = p ? p - buf : n;

	down(&pm_sem);
	for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
		if (!strncmp(buf, pm_disk_modes[i], len)) {
			mode = i;
			break;
		}
	}
	if (mode) {
		if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT ||
		     mode == PM_DISK_TEST || mode == PM_DISK_TESTPROC) {
			pm_disk_mode = mode;
		} else {
			if (pm_ops && pm_ops->enter &&
			    (mode == pm_ops->pm_disk_mode))
				pm_disk_mode = mode;
			else
				error = -EINVAL;
		}
	} else {
		error = -EINVAL;
	}

	pr_debug("PM: suspend-to-disk mode set to '%s'\n",
		 pm_disk_modes[mode]);
	up(&pm_sem);
	return error ? error : n;
}

power_attr(disk);

static ssize_t resume_show(struct subsystem * subsys, char *buf)
{
	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
		       MINOR(swsusp_resume_device));
}

static ssize_t resume_store(struct subsystem *subsys, const char *buf, size_t n)
{
	unsigned int maj, min;
	dev_t res;
	int ret = -EINVAL;

	if (sscanf(buf, "%u:%u", &maj, &min) != 2)
		goto out;

	res = MKDEV(maj,min);
	if (maj != MAJOR(res) || min != MINOR(res))
		goto out;

	down(&pm_sem);
	swsusp_resume_device = res;
	up(&pm_sem);
	printk("Attempting manual resume\n");
	noresume = 0;
	software_resume();
	ret = n;
out:
	return ret;
}

power_attr(resume);

static ssize_t image_size_show(struct subsystem * subsys, char *buf)
{
	return sprintf(buf, "%lu\n", image_size);
}

static ssize_t image_size_store(struct subsystem * subsys, const char * buf, size_t n)
{
	unsigned long size;

	if (sscanf(buf, "%lu", &size) == 1) {
		image_size = size;
		return n;
	}

	return -EINVAL;
}

power_attr(image_size);

static struct attribute * g[] = {
	&disk_attr.attr,
	&resume_attr.attr,
	&image_size_attr.attr,
	NULL,
};


static struct attribute_group attr_group = {
	.attrs = g,
};


static int __init pm_disk_init(void)
{
	return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
}

core_initcall(pm_disk_init);


static int __init resume_setup(char *str)
{
	if (noresume)
		return 1;

	strncpy( resume_file, str, 255 );
	return 1;
}

static int __init noresume_setup(char *str)
{
	noresume = 1;
	return 1;
}

__setup("noresume", noresume_setup);
__setup("resume=", resume_setup);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* kernel/power/disk.c - Suspend-to-disk support.
	3	*
	4	* Copyright (c) 2003 Patrick Mochel
	5	* Copyright (c) 2003 Open Source Development Lab
	6	* Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
	7	*
	8	* This file is released under the GPLv2.
	9	*
	10	*/
	11
	12	#include <linux/suspend.h>
	13	#include <linux/syscalls.h>
	14	#include <linux/reboot.h>
	15	#include <linux/string.h>
	16	#include <linux/device.h>
	17	#include <linux/delay.h>
	18	#include <linux/fs.h>
d53d9f16	19	#include <linux/mount.h>
88d10bba	20	#include <linux/pm.h>
97c7801c	21	#include <linux/console.h>
e3920fb4	22	#include <linux/cpu.h>
d53d9f16	23
1da177e4 LT	24	#include "power.h"
	25
	26
1da177e4 LT	27	static int noresume = 0;
	28	char resume_file[256] = CONFIG_PM_STD_PARTITION;
	29	dev_t swsusp_resume_device;
	30
	31	/**
	32	* power_down - Shut machine down for hibernate.
	33	* @mode: Suspend-to-disk mode
	34	*
	35	* Use the platform driver, if configured so, and return gracefully if it
	36	* fails.
	37	* Otherwise, try to power off and reboot. If they fail, halt the machine,
	38	* there ain't no turning back.
	39	*/
	40
	41	static void power_down(suspend_disk_method_t mode)
	42	{
1da177e4 LT	43	int error = 0;
1da177e4 LT	44
1da177e4 LT	45	switch(mode) {
1da177e4 LT	46	case PM_DISK_PLATFORM:
729b4d4c	47	kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
1da177e4 LT	48	error = pm_ops->enter(PM_SUSPEND_DISK);
	49	break;
	50	case PM_DISK_SHUTDOWN:
fdde86ac	51	kernel_power_off();
1da177e4 LT	52	break;
1da177e4 LT	53	case PM_DISK_REBOOT:
fdde86ac	54	kernel_restart(NULL);
1da177e4 LT	55	break;
1da177e4 LT	56	}
fdde86ac	57	kernel_halt();
1da177e4 LT	58	/* Valid image is on the disk, if we continue we risk serious data corruption
	59	after resume. */
	60	printk(KERN_CRIT "Please power me down manually\n");
	61	while(1);
	62	}
	63
1da177e4 LT	64	static inline void platform_finish(void)
	65	{
	66	if (pm_disk_mode == PM_DISK_PLATFORM) {
	67	if (pm_ops && pm_ops->finish)
	68	pm_ops->finish(PM_SUSPEND_DISK);
	69	}
	70	}
	71
1da177e4 LT	72	static int prepare_processes(void)
1da177e4 LT	73	{
b918f6e6	74	int error = 0;
1da177e4 LT	75
1da177e4 LT	76	pm_prepare_console();
e3920fb4 RW	77
	78	error = disable_nonboot_cpus();
	79	if (error)
	80	goto enable_cpus;
5a72e04d	81
1da177e4 LT	82	if (freeze_processes()) {
1da177e4 LT	83	error = -EBUSY;
5a72e04d	84	goto thaw;
1da177e4 LT	85	}
1da177e4 LT	86
b918f6e6 RW	87	if (pm_disk_mode == PM_DISK_TESTPROC) {
	88	printk("swsusp debug: Waiting for 5 seconds.\n");
	89	mdelay(5000);
	90	goto thaw;
	91	}
	92
1da177e4	93	/* Free memory before shutting down devices. */
72a97e08 RW	94	if (!(error = swsusp_shrink_memory()))
72a97e08 RW	95	return 0;
5a72e04d LS	96	thaw:
5a72e04d LS	97	thaw_processes();
e3920fb4	98	enable_cpus:
5a72e04d LS	99	enable_nonboot_cpus();
	100	pm_restore_console();
	101	return error;
1da177e4 LT	102	}
	103
	104	static void unprepare_processes(void)
	105	{
5a72e04d	106	platform_finish();
1da177e4	107	thaw_processes();
5a72e04d	108	enable_nonboot_cpus();
1da177e4 LT	109	pm_restore_console();
	110	}
	111
1da177e4	112	/**
f1cc0a89	113	* pm_suspend_disk - The granpappy of hibernation power management.
1da177e4 LT	114	*
	115	* If we're going through the firmware, then get it over with quickly.
	116	*
	117	* If not, then call swsusp to do its thing, then figure out how
	118	* to power down the system.
	119	*/
	120
	121	int pm_suspend_disk(void)
	122	{
	123	int error;
	124
	125	error = prepare_processes();
5a72e04d LS	126	if (error)
5a72e04d LS	127	return error;
1da177e4	128
b918f6e6 RW	129	if (pm_disk_mode == PM_DISK_TESTPROC)
	130	goto Thaw;
	131
97c7801c	132	suspend_console();
99dc7d63	133	error = device_suspend(PMSG_FREEZE);
1da177e4	134	if (error) {
97c7801c	135	resume_console();
99dc7d63	136	printk("Some devices failed to suspend\n");
b918f6e6 RW	137	goto Thaw;
	138	}
	139
	140	if (pm_disk_mode == PM_DISK_TEST) {
	141	printk("swsusp debug: Waiting for 5 seconds.\n");
	142	mdelay(5000);
	143	goto Done;
1da177e4 LT	144	}
1da177e4 LT	145
1da177e4 LT	146	pr_debug("PM: snapshotting memory.\n");
	147	in_suspend = 1;
	148	if ((error = swsusp_suspend()))
	149	goto Done;
	150
	151	if (in_suspend) {
0245b3e7	152	device_resume();
97c7801c	153	resume_console();
1da177e4	154	pr_debug("PM: writing image.\n");
f577eb30	155	error = swsusp_write();
1da177e4 LT	156	if (!error)
1da177e4 LT	157	power_down(pm_disk_mode);
99dc7d63	158	else {
99dc7d63	159	swsusp_free();
b918f6e6	160	goto Thaw;
99dc7d63	161	}
b918f6e6	162	} else {
1da177e4	163	pr_debug("PM: Image restored successfully.\n");
b918f6e6	164	}
99dc7d63	165
1da177e4 LT	166	swsusp_free();
1da177e4 LT	167	Done:
99dc7d63	168	device_resume();
97c7801c	169	resume_console();
b918f6e6	170	Thaw:
99dc7d63	171	unprepare_processes();
1da177e4 LT	172	return error;
	173	}
	174
	175
	176	/**
	177	* software_resume - Resume from a saved image.
	178	*
	179	* Called as a late_initcall (so all devices are discovered and
	180	* initialized), we call swsusp to see if we have a saved image or not.
	181	* If so, we quiesce devices, the restore the saved image. We will
	182	* return above (in pm_suspend_disk() ) if everything goes well.
	183	* Otherwise, we fail gracefully and return to the normally
	184	* scheduled program.
	185	*
	186	*/
	187
	188	static int software_resume(void)
	189	{
	190	int error;
	191
dd5d666b	192	down(&pm_sem);
3efa147a	193	if (!swsusp_resume_device) {
dd5d666b SL	194	if (!strlen(resume_file)) {
dd5d666b SL	195	up(&pm_sem);
3efa147a	196	return -ENOENT;
dd5d666b	197	}
3efa147a PM	198	swsusp_resume_device = name_to_dev_t(resume_file);
	199	pr_debug("swsusp: Resume From Partition %s\n", resume_file);
	200	} else {
	201	pr_debug("swsusp: Resume From Partition %d:%d\n",
	202	MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
	203	}
	204
1da177e4 LT	205	if (noresume) {
	206	/**
	207	* FIXME: If noresume is specified, we need to find the partition
	208	* and reset it back to normal swap space.
	209	*/
dd5d666b	210	up(&pm_sem);
1da177e4 LT	211	return 0;
	212	}
	213
	214	pr_debug("PM: Checking swsusp image.\n");
	215
	216	if ((error = swsusp_check()))
	217	goto Done;
	218
	219	pr_debug("PM: Preparing processes for restore.\n");
	220
	221	if ((error = prepare_processes())) {
	222	swsusp_close();
5a72e04d	223	goto Done;
1da177e4 LT	224	}
	225
	226	pr_debug("PM: Reading swsusp image.\n");
	227
f577eb30	228	if ((error = swsusp_read())) {
2c1b4a5c RW	229	swsusp_free();
	230	goto Thaw;
	231	}
1da177e4 LT	232
	233	pr_debug("PM: Preparing devices for restore.\n");
	234
97c7801c	235	suspend_console();
f1cc0a89	236	if ((error = device_suspend(PMSG_PRETHAW))) {
97c7801c	237	resume_console();
99dc7d63	238	printk("Some devices failed to suspend\n");
2c1b4a5c RW	239	swsusp_free();
2c1b4a5c RW	240	goto Thaw;
99dc7d63	241	}
1da177e4 LT	242
	243	mb();
	244
	245	pr_debug("PM: Restoring saved image.\n");
	246	swsusp_resume();
	247	pr_debug("PM: Restore failed, recovering.n");
99dc7d63	248	device_resume();
97c7801c	249	resume_console();
2c1b4a5c	250	Thaw:
1da177e4 LT	251	unprepare_processes();
1da177e4 LT	252	Done:
dd5d666b SL	253	/* For success case, the suspend path will release the lock */
dd5d666b SL	254	up(&pm_sem);
1da177e4 LT	255	pr_debug("PM: Resume from disk failed.\n");
	256	return 0;
	257	}
	258
	259	late_initcall(software_resume);
	260
	261
3b364b8d	262	static const char * const pm_disk_modes[] = {
1da177e4 LT	263	[PM_DISK_FIRMWARE] = "firmware",
	264	[PM_DISK_PLATFORM] = "platform",
	265	[PM_DISK_SHUTDOWN] = "shutdown",
	266	[PM_DISK_REBOOT] = "reboot",
b918f6e6 RW	267	[PM_DISK_TEST] = "test",
b918f6e6 RW	268	[PM_DISK_TESTPROC] = "testproc",
1da177e4 LT	269	};
	270
	271	/**
	272	* disk - Control suspend-to-disk mode
	273	*
	274	* Suspend-to-disk can be handled in several ways. The greatest
	275	* distinction is who writes memory to disk - the firmware or the OS.
	276	* If the firmware does it, we assume that it also handles suspending
	277	* the system.
	278	* If the OS does it, then we have three options for putting the system
	279	* to sleep - using the platform driver (e.g. ACPI or other PM registers),
	280	* powering off the system or rebooting the system (for testing).
	281	*
	282	* The system will support either 'firmware' or 'platform', and that is
	283	* known a priori (and encoded in pm_ops). But, the user may choose
	284	* 'shutdown' or 'reboot' as alternatives.
	285	*
	286	* show() will display what the mode is currently set to.
	287	* store() will accept one of
	288	*
	289	* 'firmware'
	290	* 'platform'
	291	* 'shutdown'
	292	* 'reboot'
	293	*
	294	* It will only change to 'firmware' or 'platform' if the system
	295	* supports it (as determined from pm_ops->pm_disk_mode).
	296	*/
	297
	298	static ssize_t disk_show(struct subsystem * subsys, char * buf)
	299	{
	300	return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
	301	}
	302
	303
	304	static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
	305	{
	306	int error = 0;
	307	int i;
	308	int len;
	309	char *p;
	310	suspend_disk_method_t mode = 0;
	311
	312	p = memchr(buf, '\n', n);
	313	len = p ? p - buf : n;
	314
	315	down(&pm_sem);
	316	for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
	317	if (!strncmp(buf, pm_disk_modes[i], len)) {
	318	mode = i;
	319	break;
	320	}
	321	}
	322	if (mode) {
b918f6e6 RW	323	if (mode == PM_DISK_SHUTDOWN \|\| mode == PM_DISK_REBOOT \|\|
b918f6e6 RW	324	mode == PM_DISK_TEST \|\| mode == PM_DISK_TESTPROC) {
1da177e4	325	pm_disk_mode = mode;
b918f6e6	326	} else {
1da177e4 LT	327	if (pm_ops && pm_ops->enter &&
	328	(mode == pm_ops->pm_disk_mode))
	329	pm_disk_mode = mode;
	330	else
	331	error = -EINVAL;
	332	}
b918f6e6	333	} else {
1da177e4	334	error = -EINVAL;
b918f6e6	335	}
1da177e4 LT	336
	337	pr_debug("PM: suspend-to-disk mode set to '%s'\n",
	338	pm_disk_modes[mode]);
	339	up(&pm_sem);
	340	return error ? error : n;
	341	}
	342
	343	power_attr(disk);
	344
	345	static ssize_t resume_show(struct subsystem * subsys, char *buf)
	346	{
	347	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
	348	MINOR(swsusp_resume_device));
	349	}
	350
a576219a	351	static ssize_t resume_store(struct subsystem subsys, const char buf, size_t n)
1da177e4	352	{
1da177e4	353	unsigned int maj, min;
1da177e4	354	dev_t res;
a576219a	355	int ret = -EINVAL;
1da177e4	356
a576219a AM	357	if (sscanf(buf, "%u:%u", &maj, &min) != 2)
a576219a AM	358	goto out;
1da177e4	359
a576219a AM	360	res = MKDEV(maj,min);
	361	if (maj != MAJOR(res) \|\| min != MINOR(res))
	362	goto out;
1da177e4	363
a576219a AM	364	down(&pm_sem);
	365	swsusp_resume_device = res;
	366	up(&pm_sem);
	367	printk("Attempting manual resume\n");
	368	noresume = 0;
	369	software_resume();
	370	ret = n;
	371	out:
	372	return ret;
1da177e4 LT	373	}
	374
	375	power_attr(resume);
	376
ca0aec0f RW	377	static ssize_t image_size_show(struct subsystem * subsys, char *buf)
ca0aec0f RW	378	{
853609b6	379	return sprintf(buf, "%lu\n", image_size);
ca0aec0f RW	380	}
	381
	382	static ssize_t image_size_store(struct subsystem * subsys, const char * buf, size_t n)
	383	{
853609b6	384	unsigned long size;
ca0aec0f	385
853609b6	386	if (sscanf(buf, "%lu", &size) == 1) {
ca0aec0f RW	387	image_size = size;
	388	return n;
	389	}
	390
	391	return -EINVAL;
	392	}
	393
	394	power_attr(image_size);
	395
1da177e4 LT	396	static struct attribute * g[] = {
	397	&disk_attr.attr,
	398	&resume_attr.attr,
ca0aec0f	399	&image_size_attr.attr,
1da177e4 LT	400	NULL,
	401	};
	402
	403
	404	static struct attribute_group attr_group = {
	405	.attrs = g,
	406	};
	407
	408
	409	static int __init pm_disk_init(void)
	410	{
	411	return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
	412	}
	413
	414	core_initcall(pm_disk_init);
	415
	416
	417	static int __init resume_setup(char *str)
	418	{
	419	if (noresume)
	420	return 1;
	421
	422	strncpy( resume_file, str, 255 );
	423	return 1;
	424	}
	425
	426	static int __init noresume_setup(char *str)
	427	{
	428	noresume = 1;
	429	return 1;
	430	}
	431
	432	__setup("noresume", noresume_setup);
	433	__setup("resume=", resume_setup);