diff options
Diffstat (limited to 'Documentation/power/interface.txt')
-rw-r--r-- | Documentation/power/interface.txt | 21 |
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 |
21 | mechanism. Suspend-to-disk can be handled in several ways. The | 21 | mechanism. Suspend-to-disk can be handled in several ways. We have a |
22 | greatest distinction is who writes memory to disk - the firmware or | 22 | few options for putting the system to sleep - using the platform driver |
23 | the 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 |
24 | suspending the system. | 24 | system (for testing). |
25 | |||
26 | If the kernel does it, then we have three options for putting the system | ||
27 | to sleep - using the platform driver (e.g. ACPI or other PM | ||
28 | registers), powering off the system or rebooting the system (for | ||
29 | testing). The system will support either 'firmware' or 'platform', and | ||
30 | that is known a priori. But, the user may choose 'shutdown' or | ||
31 | 'reboot' as alternatives. | ||
32 | 25 | ||
33 | Additionally, /sys/power/disk can be used to turn on one of the two testing | 26 | Additionally, /sys/power/disk can be used to turn on one of the two testing |
34 | modes of the suspend-to-disk mechanism: 'testproc' or 'test'. If the | 27 | modes of the suspend-to-disk mechanism: 'testproc' or 'test'. If the |
@@ -44,16 +37,12 @@ is being slow and which device drivers are misbehaving. | |||
44 | Reading from this file will display what the mode is currently set | 37 | Reading from this file will display what the mode is currently set |
45 | to. Writing to this file will accept one of | 38 | to. 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 | ||
54 | It will only change to 'firmware' or 'platform' if the system supports | ||
55 | it. | ||
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 |
58 | the suspend-to-disk mechanism. It can be written a string | 47 | the suspend-to-disk mechanism. It can be written a string |
59 | representing a non-negative integer that will be used as an upper | 48 | representing a non-negative integer that will be used as an upper |