623 lines
21 KiB
Plaintext
623 lines
21 KiB
Plaintext
What: /sys/bus/usb/devices/<INTERFACE>/authorized
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Date: August 2015
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Description:
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This allows to authorize (1) or deauthorize (0)
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individual interfaces instead a whole device
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in contrast to the device authorization.
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If a deauthorized interface will be authorized
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so the driver probing must be triggered manually
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by writing INTERFACE to /sys/bus/usb/drivers_probe
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This allows to avoid side-effects with drivers
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that need multiple interfaces.
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A deauthorized interface cannot be probed or claimed.
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What: /sys/bus/usb/devices/usbX/interface_authorized_default
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Date: August 2015
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Description:
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This is used as value that determines if interfaces
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would be authorized by default.
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The value can be 1 or 0. It's by default 1.
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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 RefIdVendor RefIdProduct
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The vendor ID and device ID fields are required, the
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rest is optional. The `Ref*` tuple can be used to tell the
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driver to use the same driver_data for the new device as
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it is used for the reference device.
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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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Here add a new device (0458:7045) using driver_data from
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an already supported device (0458:704c)::
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# echo "0458 7045 0 0458 704c" > /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 is set and a USB 2.0 lpm-capable device is plugged
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in to a xHCI host which support link PM, it will perform a LPM
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test; if the test is passed and host supports USB2 hardware LPM
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(xHCI 1.0 feature), USB2 hardware LPM will be enabled for the
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device and the USB device directory will contain a file named
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power/usb2_hardware_lpm. The file holds a string value (enable
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or disable) indicating whether or not USB2 hardware LPM is
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enabled for the device. Developer can write y/Y/1 or n/N/0 to
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the file to enable/disable the feature.
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What: /sys/bus/usb/devices/.../power/usb3_hardware_lpm_u1
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/sys/bus/usb/devices/.../power/usb3_hardware_lpm_u2
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Date: November 2015
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Contact: Kevin Strasser <kevin.strasser@linux.intel.com>
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Lu Baolu <baolu.lu@linux.intel.com>
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Description:
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If CONFIG_PM is set and a USB 3.0 lpm-capable device is plugged
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in to a xHCI host which supports link PM, it will check if U1
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and U2 exit latencies have been set in the BOS descriptor; if
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the check is passed and the host supports USB3 hardware LPM,
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USB3 hardware LPM will be enabled for the device and the USB
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device directory will contain two files named
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power/usb3_hardware_lpm_u1 and power/usb3_hardware_lpm_u2. These
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files hold a string value (enable or disable) indicating whether
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or not USB3 hardware LPM U1 or U2 is enabled for the device.
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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/<INTERFACE>/wireless_status
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Date: February 2023
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Contact: Bastien Nocera <hadess@hadess.net>
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Description:
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Some USB devices use a USB receiver dongle to communicate
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wirelessly with their device using proprietary protocols. This
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attribute allows user-space to know whether the device is
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connected to its receiver dongle, and, for example, consider
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the device to be absent when choosing whether to show the
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device's battery, show a headset in a list of outputs, or show
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an on-screen keyboard if the only wireless keyboard is
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turned off.
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This attribute is not to be used to replace protocol specific
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statuses available in WWAN, WLAN/Wi-Fi, Bluetooth, etc.
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If the device does not use a receiver dongle with a wireless
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device, then this attribute will not exist.
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>
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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>/port<X>
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is usb port device's sysfs directory.
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/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", "hardwired" and "not used" if the
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information is available, and "unknown" otherwise.
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/location
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Date: October 2018
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Contact: Bjørn Mork <bjorn@mork.no>
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Description:
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Some platforms provide usb port physical location through
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firmware. This is used by the kernel to pair up logical ports
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mapping to the same physical connector. The attribute exposes the
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raw location value as a hex integer.
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/quirks
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Date: May 2018
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Contact: Nicolas Boichat <drinkcat@chromium.org>
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Description:
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In some cases, we care about time-to-active for devices
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connected on a specific port (e.g. non-standard USB port like
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pogo pins), where the device to be connected is known in
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advance, and behaves well according to the specification.
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This attribute is a bit-field that controls the behavior of
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a specific port:
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- Bit 0 of this field selects the "old" enumeration scheme,
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as it is considerably faster (it only causes one USB reset
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instead of 2).
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The old enumeration scheme can also be selected globally
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using /sys/module/usbcore/parameters/old_scheme_first, but
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it is often not desirable as the new scheme was introduced to
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increase compatibility with more devices.
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- Bit 1 reduces TRSTRCY to the 10 ms that are required by the
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USB 2.0 specification, instead of the 50 ms that are normally
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used to help make enumeration work better on some high speed
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devices.
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/over_current_count
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Date: February 2018
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Contact: Richard Leitner <richard.leitner@skidata.com>
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Description:
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Most hubs are able to detect over-current situations on their
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ports and report them to the kernel. This attribute is to expose
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the number of over-current situation occurred on a specific port
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to user space. This file will contain an unsigned 32 bit value
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which wraps to 0 after its maximum is reached. This file supports
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poll() for monitoring changes to this value in user space.
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Any time this value changes the corresponding hub device will send a
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udev event with the following attributes::
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OVER_CURRENT_PORT=/sys/bus/usb/devices/.../<hub_interface>/port<X>
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OVER_CURRENT_COUNT=[current value of this sysfs attribute]
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/usb3_lpm_permit
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Date: November 2015
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Contact: Lu Baolu <baolu.lu@linux.intel.com>
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Description:
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Some USB3.0 devices are not friendly to USB3 LPM. usb3_lpm_permit
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attribute allows enabling/disabling usb3 lpm of a port. It takes
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effect both before and after a usb device is enumerated. Supported
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values are "0" if both u1 and u2 are NOT permitted, "u1" if only u1
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is permitted, "u2" if only u2 is permitted, "u1_u2" if both u1 and
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u2 are permitted.
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/connector
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Date: December 2021
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Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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Description:
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Link to the USB Type-C connector when available. This link is
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only created when USB Type-C Connector Class is enabled, and
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only if the system firmware is capable of describing the
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connection between a port and its connector.
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/disable
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Date: June 2022
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Contact: Michael Grzeschik <m.grzeschik@pengutronix.de>
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Description:
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This file controls the state of a USB port, including
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Vbus power output (but only on hubs that support
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power switching -- most hubs don't support it). If
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a port is disabled, the port is unusable: Devices
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attached to the port will not be detected, initialized,
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or enumerated.
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/early_stop
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Date: Sep 2022
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Contact: Ray Chi <raychi@google.com>
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Description:
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Some USB hosts have some watchdog mechanisms so that the device
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may enter ramdump if it takes a long time during port initialization.
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This attribute allows each port just has two attempts so that the
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port initialization will be failed quickly. In addition, if a port
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which is marked with early_stop has failed to initialize, it will ignore
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all future connections until this attribute is clear.
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What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/state
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Date: June 2023
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Contact: Roy Luo <royluo@google.com>
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Description:
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Indicates current state of the USB device attached to the port.
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Valid states are: 'not-attached', 'attached', 'powered',
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'reconnecting', 'unauthenticated', 'default', 'addressed',
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'configured', and 'suspended'. This file supports poll() to
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monitor the state change from user space.
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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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What: /sys/bus/usb/devices/.../rx_lanes
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Date: March 2018
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Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
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Description:
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Number of rx lanes the device is using.
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USB 3.2 adds Dual-lane support, 2 rx and 2 tx lanes over Type-C.
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Inter-Chip SSIC devices support asymmetric lanes up to 4 lanes per
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direction. Devices before USB 3.2 are single lane (rx_lanes = 1)
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What: /sys/bus/usb/devices/.../tx_lanes
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Date: March 2018
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Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
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Description:
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Number of tx lanes the device is using.
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USB 3.2 adds Dual-lane support, 2 rx and 2 tx -lanes over Type-C.
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Inter-Chip SSIC devices support asymmetric lanes up to 4 lanes per
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direction. Devices before USB 3.2 are single lane (tx_lanes = 1)
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What: /sys/bus/usb/devices/usbX/bAlternateSetting
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Description:
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The current interface alternate setting number, in decimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bcdDevice
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Description:
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The device's release number, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bConfigurationValue
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Description:
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While a USB device typically have just one configuration
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setting, some devices support multiple configurations.
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This value shows the current configuration, in decimal.
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Changing its value will change the device's configuration
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to another setting.
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The number of configurations supported by a device is at:
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/sys/bus/usb/devices/usbX/bNumConfigurations
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bDeviceClass
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Description:
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Class code of the device, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bDeviceProtocol
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Description:
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Protocol code of the device, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bDeviceSubClass
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Description:
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Subclass code of the device, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bInterfaceClass
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Description:
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Class code of the interface, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bInterfaceNumber
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Description:
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Interface number, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bInterfaceProtocol
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Description:
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Protocol code of the interface, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bInterfaceSubClass
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Description:
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Subclass code of the interface, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bmAttributes
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Description:
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Attributes of the current configuration, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bMaxPacketSize0
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Description:
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Maximum endpoint 0 packet size, in decimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bMaxPower
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Description:
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Maximum power consumption of the active configuration of
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the device, in miliamperes.
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What: /sys/bus/usb/devices/usbX/bNumConfigurations
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Description:
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Number of the possible configurations of the device, in
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decimal. The current configuration is controlled via:
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/sys/bus/usb/devices/usbX/bConfigurationValue
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bNumEndpoints
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Description:
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Number of endpoints used on this interface, in hexadecimal.
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/bNumInterfaces
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Description:
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Number of interfaces on this device, in decimal.
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What: /sys/bus/usb/devices/usbX/busnum
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Description:
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Number of the bus.
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What: /sys/bus/usb/devices/usbX/configuration
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Description:
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Contents of the string descriptor associated with the
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current configuration. It may include the firmware version
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of a device and/or its serial number.
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What: /sys/bus/usb/devices/usbX/descriptors
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Description:
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Contains the interface descriptors, in binary.
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What: /sys/bus/usb/devices/usbX/idProduct
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Description:
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Product ID, in hexadecimal.
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What: /sys/bus/usb/devices/usbX/idVendor
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Description:
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Vendor ID, in hexadecimal.
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What: /sys/bus/usb/devices/usbX/devspec
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Description:
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Displays the Device Tree Open Firmware node of the interface.
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What: /sys/bus/usb/devices/usbX/avoid_reset_quirk
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Description:
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Most devices have this set to zero.
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If the value is 1, enable a USB quirk that prevents this
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device to use reset.
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(read/write)
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What: /sys/bus/usb/devices/usbX/devnum
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Description:
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USB interface device number, in decimal.
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What: /sys/bus/usb/devices/usbX/devpath
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Description:
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String containing the USB interface device path.
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What: /sys/bus/usb/devices/usbX/manufacturer
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Description:
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Vendor specific string containing the name of the
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manufacturer of the device.
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What: /sys/bus/usb/devices/usbX/maxchild
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Description:
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Number of ports of an USB hub
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What: /sys/bus/usb/devices/usbX/persist
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Description:
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Keeps the device even if it gets disconnected.
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What: /sys/bus/usb/devices/usbX/product
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Description:
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Vendor specific string containing the name of the
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device's product.
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What: /sys/bus/usb/devices/usbX/speed
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Description:
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Shows the device's max speed, according to the USB version,
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in Mbps.
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Can be:
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======= ====================
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Unknown speed unknown
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1.5 Low speed
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15 Full speed
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480 High Speed
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5000 Super Speed
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10000 Super Speed+
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20000 Super Speed+ Gen 2x2
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======= ====================
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What: /sys/bus/usb/devices/usbX/supports_autosuspend
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Description:
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Returns 1 if the device doesn't support autosuspend.
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Otherwise, returns 0.
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What: /sys/bus/usb/devices/usbX/urbnum
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Description:
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Number of URBs submitted for the whole device.
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What: /sys/bus/usb/devices/usbX/version
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Description:
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String containing the USB device version, as encoded
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at the BCD descriptor.
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What: /sys/bus/usb/devices/usbX/power/autosuspend
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Description:
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Time in milliseconds for the device to autosuspend. If the
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value is negative, then autosuspend is prevented.
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(read/write)
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What: /sys/bus/usb/devices/usbX/power/active_duration
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Description:
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The total time the device has not been suspended.
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What: /sys/bus/usb/devices/usbX/power/connected_duration
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Description:
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The total time (in msec) that the device has been connected.
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What: /sys/bus/usb/devices/usbX/power/level
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Description:
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What: /sys/bus/usb/devices/usbX/ep_<N>/bEndpointAddress
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Description:
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The address of the endpoint described by this descriptor,
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in hexadecimal. The endpoint direction on this bitmapped field
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is also shown at:
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/sys/bus/usb/devices/usbX/ep_<N>/direction
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/ep_<N>/bInterval
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Description:
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The interval of the endpoint as described on its descriptor,
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in hexadecimal. The actual interval depends on the version
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of the USB. Also shown in time units at
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/sys/bus/usb/devices/usbX/ep_<N>/interval.
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What: /sys/bus/usb/devices/usbX/ep_<N>/bLength
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Description:
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Number of bytes of the endpoint descriptor, in hexadecimal.
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What: /sys/bus/usb/devices/usbX/ep_<N>/bmAttributes
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Description:
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Attributes which apply to the endpoint as described on its
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descriptor, in hexadecimal. The endpoint type on this
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bitmapped field is also shown at:
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/sys/bus/usb/devices/usbX/ep_<N>/type
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See USB specs for its meaning.
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What: /sys/bus/usb/devices/usbX/ep_<N>/direction
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Description:
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Direction of the endpoint. Can be:
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- both (on control endpoints)
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- in
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- out
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What: /sys/bus/usb/devices/usbX/ep_<N>/interval
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Description:
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Interval for polling endpoint for data transfers, in
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milisseconds or microseconds.
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What: /sys/bus/usb/devices/usbX/ep_<N>/type
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Description:
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Descriptor type. Can be:
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- Control
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- Isoc
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- Bulk
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- Interrupt
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- unknown
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What: /sys/bus/usb/devices/usbX/ep_<N>/wMaxPacketSize
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Description:
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Maximum packet size this endpoint is capable of
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sending or receiving, in hexadecimal.
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