static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
			   const char *buf, size_t n)
{
	suspend_state_t state;
	int error;

	error = pm_autosleep_lock();
	if (error)
		return error;

	if (pm_autosleep_state() > PM_SUSPEND_ON) {
		error = -EBUSY;
		goto out;
	}

	state = decode_state(buf, n);
	if (state < PM_SUSPEND_MAX)
		error = pm_suspend(state);
	else if (state == PM_SUSPEND_MAX)
		error = hibernate();
	else
		error = -EINVAL;

 out:
	pm_autosleep_unlock();
	return error ? error : n;
}

static ssize_t wakeup_count_store(struct kobject *kobj,
				struct kobj_attribute *attr,
				const char *buf, size_t n)
{
	unsigned int val;
	int error;

	error = pm_autosleep_lock();
	if (error)
		return error;

	if (pm_autosleep_state() > PM_SUSPEND_ON) {
		error = -EBUSY;
		goto out;
	}

	error = -EINVAL;
	if (sscanf(buf, "%u", &val) == 1) {
		if (pm_save_wakeup_count(val))
			error = n;
	}

 out:
	pm_autosleep_unlock();
	return error;
}

static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
			   const char *buf, size_t n)
{
	suspend_state_t state;
	struct timespec ts_entry, ts_exit;
	u64 elapsed_msecs64;
	u32 elapsed_msecs32;
	int error;

	error = pm_autosleep_lock();
	if (error)
		return error;

	if (pm_autosleep_state() > PM_SUSPEND_ON) {
		error = -EBUSY;
		goto out;
	}

	state = decode_state(buf, n);
	if (state < PM_SUSPEND_MAX) {
		/*
		 * We want to prevent system from frequent periodic wake-ups
		 * when sleeping time is less or equival certain interval.
		 * It's done in order to save power in certain cases, one of
		 * the examples is GPS tracking, but not only.
		 */
		getnstimeofday(&ts_entry);
		error = pm_suspend(state);
		getnstimeofday(&ts_exit);

		elapsed_msecs64 = timespec_to_ns(&ts_exit) -
			timespec_to_ns(&ts_entry);
		do_div(elapsed_msecs64, NSEC_PER_MSEC);
		elapsed_msecs32 = elapsed_msecs64;

		if (elapsed_msecs32 <= SBO_SLEEP_MSEC) {
			if (suspend_short_count == SBO_CNT)
				suspend_backoff();
			else
				suspend_short_count++;
		} else {
			suspend_short_count = 0;
		}
	} else if (state == PM_SUSPEND_MAX)
		error = hibernate();
	else
		error = -EINVAL;

 out:
	pm_autosleep_unlock();
	return error ? error : n;
}

static ssize_t autosleep_show(struct kobject *kobj,
			      struct kobj_attribute *attr,
			      char *buf)
{
	suspend_state_t state = pm_autosleep_state();

	if (state == PM_SUSPEND_ON)
		return sprintf(buf, "off\n");

#ifdef CONFIG_SUSPEND
	if (state < PM_SUSPEND_MAX)
		return sprintf(buf, "%s\n", valid_state(state) ?
						pm_states[state] : "error");
#endif
#ifdef CONFIG_HIBERNATION
	return sprintf(buf, "disk\n");
#else
	return sprintf(buf, "error");
#endif
}