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;
}