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apm-emulation: add hibernation APM events to support suspend2disk

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Some embedded systems use hibernation for fast boot. and in it,
some software components need to handle specific things before
hibernation and after restore. So it needs to capture the apm
status about these pm events.

Currently apm just supports suspend to ram, but not suspend to disk,
so here add logic about hibernation apm events.

Signed-off-by: Bin Shi <Bin.Shi@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Bin Shi 2014-01-03 14:08:54 +08:00 committed by Jiri Kosina
parent 5e01dc7b26
commit 1582043970
2 changed files with 11 additions and 2 deletions
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11
drivers/char/apm-emulation.c
View file

@ -531,6 +531,7 @@ static int apm_suspend_notifier(struct notifier_block *nb,
{
struct apm_user *as;
int err;
unsigned long apm_event;
/* short-cut emergency suspends */
if (atomic_read(&userspace_notification_inhibit))
@ -538,6 +539,9 @@ static int apm_suspend_notifier(struct notifier_block *nb,
switch (event) {
case PM_SUSPEND_PREPARE:
case PM_HIBERNATION_PREPARE:
apm_event = (event == PM_SUSPEND_PREPARE) ?
APM_USER_SUSPEND : APM_USER_HIBERNATION;
/*
* Queue an event to all "writer" users that we want
* to suspend and need their ack.
@ -550,7 +554,7 @@ static int apm_suspend_notifier(struct notifier_block *nb,
as->writer && as->suser) {
as->suspend_state = SUSPEND_PENDING;
atomic_inc(&suspend_acks_pending);
queue_add_event(&as->queue, APM_USER_SUSPEND);
queue_add_event(&as->queue, apm_event);
}
}
@ -601,11 +605,14 @@ static int apm_suspend_notifier(struct notifier_block *nb,
return notifier_from_errno(err);
case PM_POST_SUSPEND:
case PM_POST_HIBERNATION:
apm_event = (event == PM_POST_SUSPEND) ?
APM_NORMAL_RESUME : APM_HIBERNATION_RESUME;
/*
* Anyone on the APM queues will think we're still suspended.
* Send a message so everyone knows we're now awake again.
*/
queue_event(APM_NORMAL_RESUME);
queue_event(apm_event);
/*
* Finally, wake up anyone who is sleeping on the suspend.

2
include/uapi/linux/apm_bios.h
View file

@ -67,6 +67,8 @@ struct apm_bios_info {
#define APM_USER_SUSPEND 0x000a
#define APM_STANDBY_RESUME 0x000b
#define APM_CAPABILITY_CHANGE 0x000c
#define APM_USER_HIBERNATION 0x000d
#define APM_HIBERNATION_RESUME 0x000e
/*
* Error codes