diff options
Diffstat (limited to 'Documentation/ABI')
-rw-r--r-- | Documentation/ABI/testing/sysfs-bus-usb | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb index f9937add033d..9734577d1711 100644 --- a/Documentation/ABI/testing/sysfs-bus-usb +++ b/Documentation/ABI/testing/sysfs-bus-usb | |||
@@ -39,3 +39,16 @@ Description: | |||
39 | If you want to suspend a device immediately but leave it | 39 | If you want to suspend a device immediately but leave it |
40 | free to wake up in response to I/O requests, you should | 40 | free to wake up in response to I/O requests, you should |
41 | write "0" to power/autosuspend. | 41 | write "0" to power/autosuspend. |
42 | |||
43 | What: /sys/bus/usb/devices/.../power/persist | ||
44 | Date: May 2007 | ||
45 | KernelVersion: 2.6.23 | ||
46 | Contact: Alan Stern <stern@rowland.harvard.edu> | ||
47 | Description: | ||
48 | If CONFIG_USB_PERSIST is set, then each USB device directory | ||
49 | will contain a file named power/persist. The file holds a | ||
50 | boolean value (0 or 1) indicating whether or not the | ||
51 | "USB-Persist" facility is enabled for the device. Since the | ||
52 | facility is inherently dangerous, it is disabled by default | ||
53 | for all devices except hubs. For more information, see | ||
54 | Documentation/usb/persist.txt. | ||