147 строки
5.3 KiB
Plaintext
147 строки
5.3 KiB
Plaintext
What: /sys/bus/usb/devices/.../power/autosuspend
|
|
Date: March 2007
|
|
KernelVersion: 2.6.21
|
|
Contact: Alan Stern <stern@rowland.harvard.edu>
|
|
Description:
|
|
Each USB device directory will contain a file named
|
|
power/autosuspend. This file holds the time (in seconds)
|
|
the device must be idle before it will be autosuspended.
|
|
0 means the device will be autosuspended as soon as
|
|
possible. Negative values will prevent the device from
|
|
being autosuspended at all, and writing a negative value
|
|
will resume the device if it is already suspended.
|
|
|
|
The autosuspend delay for newly-created devices is set to
|
|
the value of the usbcore.autosuspend module parameter.
|
|
|
|
What: /sys/bus/usb/devices/.../power/level
|
|
Date: March 2007
|
|
KernelVersion: 2.6.21
|
|
Contact: Alan Stern <stern@rowland.harvard.edu>
|
|
Description:
|
|
Each USB device directory will contain a file named
|
|
power/level. This file holds a power-level setting for
|
|
the device, one of "on", "auto", or "suspend".
|
|
|
|
"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. "suspend" means the device
|
|
is forced into a suspended state and it will not autoresume
|
|
in response to I/O requests. However remote-wakeup requests
|
|
from the device may still be enabled (the remote-wakeup
|
|
setting is controlled separately by the power/wakeup
|
|
attribute).
|
|
|
|
During normal use, devices should be left in the "auto"
|
|
level. The other levels are 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.
|
|
|
|
What: /sys/bus/usb/devices/.../power/persist
|
|
Date: May 2007
|
|
KernelVersion: 2.6.23
|
|
Contact: Alan Stern <stern@rowland.harvard.edu>
|
|
Description:
|
|
If CONFIG_USB_PERSIST is set, then each USB device directory
|
|
will contain a file named power/persist. The file holds a
|
|
boolean value (0 or 1) indicating whether or not the
|
|
"USB-Persist" facility is enabled for the device. Since the
|
|
facility is inherently dangerous, it is disabled by default
|
|
for all devices except hubs. For more information, see
|
|
Documentation/usb/persist.txt.
|
|
|
|
What: /sys/bus/usb/device/.../power/connected_duration
|
|
Date: January 2008
|
|
KernelVersion: 2.6.25
|
|
Contact: Sarah Sharp <sarah.a.sharp@intel.com>
|
|
Description:
|
|
If CONFIG_PM and CONFIG_USB_SUSPEND are enabled, then this file
|
|
is present. When read, it returns the total time (in msec)
|
|
that the USB device has been connected to the machine. This
|
|
file is read-only.
|
|
Users:
|
|
PowerTOP <power@bughost.org>
|
|
http://www.lesswatts.org/projects/powertop/
|
|
|
|
What: /sys/bus/usb/device/.../power/active_duration
|
|
Date: January 2008
|
|
KernelVersion: 2.6.25
|
|
Contact: Sarah Sharp <sarah.a.sharp@intel.com>
|
|
Description:
|
|
If CONFIG_PM and CONFIG_USB_SUSPEND are enabled, then this file
|
|
is present. When read, it returns the total time (in msec)
|
|
that the USB device has been active, i.e. not in a suspended
|
|
state. This file is read-only.
|
|
|
|
Tools can use this file and the connected_duration file to
|
|
compute the percentage of time that a device has been active.
|
|
For example,
|
|
echo $((100 * `cat active_duration` / `cat connected_duration`))
|
|
will give an integer percentage. Note that this does not
|
|
account for counter wrap.
|
|
Users:
|
|
PowerTOP <power@bughost.org>
|
|
http://www.lesswatts.org/projects/powertop/
|
|
|
|
What: /sys/bus/usb/device/<busnum>-<devnum>...:<config num>-<interface num>/supports_autosuspend
|
|
Date: January 2008
|
|
KernelVersion: 2.6.27
|
|
Contact: Sarah Sharp <sarah.a.sharp@intel.com>
|
|
Description:
|
|
When read, this file returns 1 if the interface driver
|
|
for this interface supports autosuspend. It also
|
|
returns 1 if no driver has claimed this interface, as an
|
|
unclaimed interface will not stop the device from being
|
|
autosuspended if all other interface drivers are idle.
|
|
The file returns 0 if autosuspend support has not been
|
|
added to the driver.
|
|
Users:
|
|
USB PM tool
|
|
git://git.moblin.org/users/sarah/usb-pm-tool/
|
|
|
|
What: /sys/bus/usb/device/.../authorized
|
|
Date: July 2008
|
|
KernelVersion: 2.6.26
|
|
Contact: David Vrabel <david.vrabel@csr.com>
|
|
Description:
|
|
Authorized devices are available for use by device
|
|
drivers, non-authorized one are not. By default, wired
|
|
USB devices are authorized.
|
|
|
|
Certified Wireless USB devices are not authorized
|
|
initially and should be (by writing 1) after the
|
|
device has been authenticated.
|
|
|
|
What: /sys/bus/usb/device/.../wusb_cdid
|
|
Date: July 2008
|
|
KernelVersion: 2.6.27
|
|
Contact: David Vrabel <david.vrabel@csr.com>
|
|
Description:
|
|
For Certified Wireless USB devices only.
|
|
|
|
A devices's CDID, as 16 space-separated hex octets.
|
|
|
|
What: /sys/bus/usb/device/.../wusb_ck
|
|
Date: July 2008
|
|
KernelVersion: 2.6.27
|
|
Contact: David Vrabel <david.vrabel@csr.com>
|
|
Description:
|
|
For Certified Wireless USB devices only.
|
|
|
|
Write the device's connection key (CK) to start the
|
|
authentication of the device. The CK is 16
|
|
space-separated hex octets.
|
|
|
|
What: /sys/bus/usb/device/.../wusb_disconnect
|
|
Date: July 2008
|
|
KernelVersion: 2.6.27
|
|
Contact: David Vrabel <david.vrabel@csr.com>
|
|
Description:
|
|
For Certified Wireless USB devices only.
|
|
|
|
Write a 1 to force the device to disconnect
|
|
(equivalent to unplugging a wired USB device).
|