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authorLuca Tettamanti <kronos.it@gmail.com>2006-03-23 03:00:09 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-23 07:38:08 -0800
commit9b238205ba5d79a8a242d7a5ddb82b89e4dc4e48 (patch)
tree494b06bddd9d6b28a4e83ad7b49523a92ee5b207 /kernel/power/user.c
parent94c188d32996beac00426740974310e32f162c14 (diff)
[PATCH] swsusp: add s2ram ioctl to userland interface
Add the SNAPSHOT_S2RAM ioctl to the snapshot device. This ioctl allows a userland application to make the system (previously frozen with the SNAPSHOT_FREE ioctl) enter the S3 state without freezing processes and disabling nonboot CPUs for the second time. This will allow us to implement the suspend-to-disk-and-RAM (STDR) functionality in the userland suspend tools. Signed-off-by: Luca Tettamanti <kronos.it@gmail.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power/user.c')
-rw-r--r--kernel/power/user.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/kernel/power/user.c b/kernel/power/user.c
index bbd4842104a..3f1539fbe48 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -266,6 +266,42 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
}
break;
+ case SNAPSHOT_S2RAM:
+ if (!data->frozen) {
+ error = -EPERM;
+ break;
+ }
+
+ if (down_trylock(&pm_sem)) {
+ error = -EBUSY;
+ break;
+ }
+
+ if (pm_ops->prepare) {
+ error = pm_ops->prepare(PM_SUSPEND_MEM);
+ if (error)
+ goto OutS3;
+ }
+
+ /* Put devices to sleep */
+ error = device_suspend(PMSG_SUSPEND);
+ if (error) {
+ printk(KERN_ERR "Failed to suspend some devices.\n");
+ } else {
+ /* Enter S3, system is already frozen */
+ suspend_enter(PM_SUSPEND_MEM);
+
+ /* Wake up devices */
+ device_resume();
+ }
+
+ if (pm_ops->finish)
+ pm_ops->finish(PM_SUSPEND_MEM);
+
+OutS3:
+ up(&pm_sem);
+ break;
+
default:
error = -ENOTTY;