-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/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_RUNTIME is 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_RUNTIME is 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/devices/<busnum>-<port[.port]>...:<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
device IDs, exactly like reading from the entry
"/sys/bus/usb/drivers/.../new_id"
-What: /sys/bus/usb/device/.../avoid_reset_quirk
-Date: December 2009
-Contact: Oliver Neukum <oliver@neukum.org>
-Description:
- Writing 1 to this file tells the kernel that this
- device will morph into another mode when it is reset.
- Drivers will not use reset for error handling for
- such devices.
-Users:
- usb_modeswitch
-
What: /sys/bus/usb/devices/.../power/usb2_hardware_lpm
Date: September 2011
Contact: Andiry Xu <andiry.xu@amd.com>
projects / ~andy / linux / blobdiff