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-rw-r--r--Documentation/power/interface.txt21
1 files changed, 5 insertions, 16 deletions
diff --git a/Documentation/power/interface.txt b/Documentation/power/interface.txt
index 74311d7e0f3c..8c5b41bf3f36 100644
--- a/Documentation/power/interface.txt
+++ b/Documentation/power/interface.txt
@@ -18,17 +18,10 @@ states.
18 18
19 19
20/sys/power/disk controls the operating mode of the suspend-to-disk 20/sys/power/disk controls the operating mode of the suspend-to-disk
21mechanism. Suspend-to-disk can be handled in several ways. The 21mechanism. Suspend-to-disk can be handled in several ways. We have a
22greatest distinction is who writes memory to disk - the firmware or 22few options for putting the system to sleep - using the platform driver
23the kernel. If the firmware does it, we assume that it also handles 23(e.g. ACPI or other pm_ops), powering off the system or rebooting the
24suspending the system. 24system (for testing).
25
26If the kernel does it, then we have three options for putting the system
27to sleep - using the platform driver (e.g. ACPI or other PM
28registers), powering off the system or rebooting the system (for
29testing). The system will support either 'firmware' or 'platform', and
30that is known a priori. But, the user may choose 'shutdown' or
31'reboot' as alternatives.
32 25
33Additionally, /sys/power/disk can be used to turn on one of the two testing 26Additionally, /sys/power/disk can be used to turn on one of the two testing
34modes of the suspend-to-disk mechanism: 'testproc' or 'test'. If the 27modes of the suspend-to-disk mechanism: 'testproc' or 'test'. If the
@@ -44,16 +37,12 @@ is being slow and which device drivers are misbehaving.
44Reading from this file will display what the mode is currently set 37Reading from this file will display what the mode is currently set
45to. Writing to this file will accept one of 38to. Writing to this file will accept one of
46 39
47 'firmware' 40 'platform' (only if the platform supports it)
48 'platform'
49 'shutdown' 41 'shutdown'
50 'reboot' 42 'reboot'
51 'testproc' 43 'testproc'
52 'test' 44 'test'
53 45
54It will only change to 'firmware' or 'platform' if the system supports
55it.
56
57/sys/power/image_size controls the size of the image created by 46/sys/power/image_size controls the size of the image created by
58the suspend-to-disk mechanism. It can be written a string 47the suspend-to-disk mechanism. It can be written a string
59representing a non-negative integer that will be used as an upper 48representing a non-negative integer that will be used as an upper