path: root/Documentation/ABI/obsolete/sysfs-bus-usb
diff options
Diffstat (limited to 'Documentation/ABI/obsolete/sysfs-bus-usb')
1 files changed, 0 insertions, 31 deletions
diff --git a/Documentation/ABI/obsolete/sysfs-bus-usb b/Documentation/ABI/obsolete/sysfs-bus-usb
deleted file mode 100644
index bd096d33fbc..00000000000
--- a/Documentation/ABI/obsolete/sysfs-bus-usb
+++ /dev/null
@@ -1,31 +0,0 @@
-What: /sys/bus/usb/devices/.../power/level
-Date: March 2007
-KernelVersion: 2.6.21
-Contact: Alan Stern <>
- Each USB device directory will contain a file named
- power/level. This file holds a power-level setting for
- the device, either "on" or "auto".
- "on" means that the device is not allowed to autosuspend,
- although normal suspends for system sleep will still
- be honored. "auto" means the device will autosuspend
- and autoresume in the usual manner, according to the
- capabilities of its driver.
- During normal use, devices should be left in the "auto"
- level. The "on" level is meant for administrative uses.
- If you want to suspend a device immediately but leave it
- free to wake up in response to I/O requests, you should
- write "0" to power/autosuspend.
- Device not capable of proper suspend and resume should be
- left in the "on" level. Although the USB spec requires
- devices to support suspend/resume, many of them do not.
- In fact so many don't that by default, the USB core
- initializes all non-hub devices in the "on" level. Some
- drivers may change this setting when they are bound.
- This file is deprecated and will be removed after 2010.
- Use the power/control file instead; it does exactly the
- same thing.