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1f77fdf786
Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
177 lines
6.6 KiB
Plaintext
177 lines
6.6 KiB
Plaintext
What: /sys/bus/usb/device/.../authorized
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Date: July 2008
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KernelVersion: 2.6.26
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Contact: David Vrabel <david.vrabel@csr.com>
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Description:
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Authorized devices are available for use by device
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drivers, non-authorized one are not. By default, wired
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USB devices are authorized.
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Certified Wireless USB devices are not authorized
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initially and should be (by writing 1) after the
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device has been authenticated.
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What: /sys/bus/usb/device/.../wusb_cdid
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Date: July 2008
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KernelVersion: 2.6.27
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Contact: David Vrabel <david.vrabel@csr.com>
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Description:
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For Certified Wireless USB devices only.
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A devices's CDID, as 16 space-separated hex octets.
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What: /sys/bus/usb/device/.../wusb_ck
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Date: July 2008
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KernelVersion: 2.6.27
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Contact: David Vrabel <david.vrabel@csr.com>
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Description:
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For Certified Wireless USB devices only.
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Write the device's connection key (CK) to start the
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authentication of the device. The CK is 16
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space-separated hex octets.
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What: /sys/bus/usb/device/.../wusb_disconnect
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Date: July 2008
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KernelVersion: 2.6.27
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Contact: David Vrabel <david.vrabel@csr.com>
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Description:
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For Certified Wireless USB devices only.
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Write a 1 to force the device to disconnect
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(equivalent to unplugging a wired USB device).
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What: /sys/bus/usb/drivers/.../new_id
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Date: October 2011
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Contact: linux-usb@vger.kernel.org
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Description:
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Writing a device ID to this file will attempt to
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dynamically add a new device ID to a USB device driver.
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This may allow the driver to support more hardware than
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was included in the driver's static device ID support
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table at compile time. The format for the device ID is:
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idVendor idProduct bInterfaceClass.
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The vendor ID and device ID fields are required, the
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interface class is optional.
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Upon successfully adding an ID, the driver will probe
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for the device and attempt to bind to it. For example:
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# echo "8086 10f5" > /sys/bus/usb/drivers/foo/new_id
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Reading from this file will list all dynamically added
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device IDs in the same format, with one entry per
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line. For example:
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# cat /sys/bus/usb/drivers/foo/new_id
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8086 10f5
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dead beef 06
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f00d cafe
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The list will be truncated at PAGE_SIZE bytes due to
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sysfs restrictions.
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What: /sys/bus/usb-serial/drivers/.../new_id
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Date: October 2011
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Contact: linux-usb@vger.kernel.org
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Description:
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For serial USB drivers, this attribute appears under the
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extra bus folder "usb-serial" in sysfs; apart from that
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difference, all descriptions from the entry
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"/sys/bus/usb/drivers/.../new_id" apply.
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What: /sys/bus/usb/drivers/.../remove_id
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Date: November 2009
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Contact: CHENG Renquan <rqcheng@smu.edu.sg>
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Description:
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Writing a device ID to this file will remove an ID
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that was dynamically added via the new_id sysfs entry.
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The format for the device ID is:
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idVendor idProduct. After successfully
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removing an ID, the driver will no longer support the
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device. This is useful to ensure auto probing won't
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match the driver to the device. For example:
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# echo "046d c315" > /sys/bus/usb/drivers/foo/remove_id
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Reading from this file will list the dynamically added
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device IDs, exactly like reading from the entry
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"/sys/bus/usb/drivers/.../new_id"
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What: /sys/bus/usb/devices/.../power/usb2_hardware_lpm
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Date: September 2011
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Contact: Andiry Xu <andiry.xu@amd.com>
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Description:
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If CONFIG_PM_RUNTIME is set and a USB 2.0 lpm-capable device
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is plugged in to a xHCI host which support link PM, it will
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perform a LPM test; if the test is passed and host supports
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USB2 hardware LPM (xHCI 1.0 feature), USB2 hardware LPM will
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be enabled for the device and the USB device directory will
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contain a file named power/usb2_hardware_lpm. The file holds
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a string value (enable or disable) indicating whether or not
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USB2 hardware LPM is enabled for the device. Developer can
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write y/Y/1 or n/N/0 to the file to enable/disable the
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feature.
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What: /sys/bus/usb/devices/.../removable
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Date: February 2012
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Contact: Matthew Garrett <mjg@redhat.com>
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Description:
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Some information about whether a given USB device is
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physically fixed to the platform can be inferred from a
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combination of hub descriptor bits and platform-specific data
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such as ACPI. This file will read either "removable" or
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"fixed" if the information is available, and "unknown"
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otherwise.
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What: /sys/bus/usb/devices/.../ltm_capable
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Date: July 2012
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Contact: Sarah Sharp <sarah.a.sharp@linux.intel.com>
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Description:
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USB 3.0 devices may optionally support Latency Tolerance
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Messaging (LTM). They indicate their support by setting a bit
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in the bmAttributes field of their SuperSpeed BOS descriptors.
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If that bit is set for the device, ltm_capable will read "yes".
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If the device doesn't support LTM, the file will read "no".
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The file will be present for all speeds of USB devices, and will
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always read "no" for USB 1.1 and USB 2.0 devices.
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What: /sys/bus/usb/devices/.../(hub interface)/portX
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Date: August 2012
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Contact: Lan Tianyu <tianyu.lan@intel.com>
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Description:
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The /sys/bus/usb/devices/.../(hub interface)/portX
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is usb port device's sysfs directory.
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What: /sys/bus/usb/devices/.../(hub interface)/portX/connect_type
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Date: January 2013
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Contact: Lan Tianyu <tianyu.lan@intel.com>
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Description:
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Some platforms provide usb port connect types through ACPI.
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This attribute is to expose these information to user space.
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The file will read "hotplug", "wired" and "not used" if the
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information is available, and "unknown" otherwise.
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What: /sys/bus/usb/devices/.../power/usb2_lpm_l1_timeout
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Date: May 2013
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Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
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Description:
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USB 2.0 devices may support hardware link power management (LPM)
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L1 sleep state. The usb2_lpm_l1_timeout attribute allows
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tuning the timeout for L1 inactivity timer (LPM timer), e.g.
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needed inactivity time before host requests the device to go to L1 sleep.
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Useful for power management tuning.
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Supported values are 0 - 65535 microseconds.
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What: /sys/bus/usb/devices/.../power/usb2_lpm_besl
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Date: May 2013
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Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
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Description:
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USB 2.0 devices that support hardware link power management (LPM)
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L1 sleep state now use a best effort service latency value (BESL) to
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indicate the best effort to resumption of service to the device after the
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initiation of the resume event.
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If the device does not have a preferred besl value then the host can select
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one instead. This usb2_lpm_besl attribute allows to tune the host selected besl
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value in order to tune power saving and service latency.
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Supported values are 0 - 15.
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More information on how besl values map to microseconds can be found in
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USB 2.0 ECN Errata for Link Power Management, section 4.10)
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