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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| 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/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/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/.../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/.../devnum | ||
| KernelVersion: since at least 2.6.18 | ||
| Description: | ||
| Device address on the USB bus. | ||
| Users: | ||
| libusb | ||
|
|
||
| What: /sys/bus/usb/devices/.../bConfigurationValue | ||
| KernelVersion: since at least 2.6.18 | ||
| Description: | ||
| bConfigurationValue of the *active* configuration for the | ||
| device. Writing 0 or -1 to bConfigurationValue will reset the | ||
| active configuration (unconfigure the device). Writing | ||
| another value will change the active configuration. | ||
|
|
||
| Note that some devices, in violation of the USB spec, have a | ||
| configuration with a value equal to 0. Writing 0 to | ||
| bConfigurationValue for these devices will install that | ||
| configuration, rather then unconfigure the device. | ||
|
|
||
| Writing -1 will always unconfigure the device. | ||
| Users: | ||
| libusb | ||
|
|
||
| What: /sys/bus/usb/devices/.../busnum | ||
| KernelVersion: 2.6.22 | ||
| Description: | ||
| Bus-number of the USB-bus the device is connected to. | ||
| Users: | ||
| libusb | ||
|
|
||
| What: /sys/bus/usb/devices/.../descriptors | ||
| KernelVersion: 2.6.26 | ||
| Description: | ||
| Binary file containing cached descriptors of the device. The | ||
| binary data consists of the device descriptor followed by the | ||
| descriptors for each configuration of the device. | ||
| Note that the wTotalLength of the config descriptors can not | ||
| be trusted, as the device may have a smaller config descriptor | ||
| than it advertises. The bLength field of each (sub) descriptor | ||
| can be trusted, and can be used to seek forward one (sub) | ||
| descriptor at a time until the next config descriptor is found. | ||
| All descriptors read from this file are in bus-endian format | ||
| Users: | ||
| libusb | ||
|
|
||
| What: /sys/bus/usb/devices/.../speed | ||
| KernelVersion: since at least 2.6.18 | ||
| Description: | ||
| Speed the device is connected with to the usb-host in | ||
| Mbit / second. IE one of 1.5 / 12 / 480 / 5000. | ||
| Users: | ||
| libusb |
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