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NG_UBT(4)              FreeBSD Kernel Interfaces Manual              NG_UBT(4)

NAME
     ng_ubt - Netgraph node type that is also a driver for Bluetooth USB
     devices

SYNOPSIS
     #include <sys/types.h>
     #include <netgraph/bluetooth/include/ng_ubt.h>

DESCRIPTION
     The ubt node type is both a persistent Netgraph node type and a driver
     for Bluetooth USB devices.  It implements a Bluetooth USB transport layer
     as per chapter H2 of the Bluetooth Specification Book v1.1.  A new node
     is created when supported USB device is plugged.

     The node has a single hook called hook.  Incoming bytes received on the
     device are re-assembled into HCI frames (according to the length).  Full
     HCI frames are sent out on the hook.  The node will add HCI frame
     indicator if device did not send it.  HCI frames received on hook are
     transmitted out.  The node will drop HCI frame indicator unless device
     requires it to be present.

HOOKS
     This node type supports the following hooks:

     hook    single HCI frame contained in single mbuf structure.

CONTROL MESSAGES
     This node type supports the generic control messages, plus the following:

     NGM_UBT_NODE_GET_DEBUG
             Returns an integer containing the current debug level for the
             node.

     NGM_UBT_NODE_SET_DEBUG
             This command takes an integer argument and sets current debug
             level for the node.

     NGM_UBT_NODE_GET_QLEN
             This command takes a parameter that specifies queue number and
             returns current maximal length of the queue for the node.

     NGM_UBT_NODE_SET_QLEN
             This command takes two parameters that specify queue number and
             maximum length of the queue and sets maximal length of the queue
             for the node.

     NGM_UBT_NODE_GET_STAT
             Returns various statistic information for the node, such as:
             number of bytes (frames) sent, number of bytes (frames) received
             and number of input (output) errors.

     NGM_UBT_NODE_RESET_STAT
             Reset all statistic counters to zero.

     NGM_UBT_NODE_DEV_NODES
             This command takes single integer parameter.  If the parameter's
             value is not zero, then the driver will create device nodes for
             the control, interrupt, bulk-in and bulk-out endpoints.  If the
             parameter's value is zero, then the driver will destroy device
             nodes for the endpoints.  The device nodes interface is mutually
             exclusive with Netgraph interface.

DEVICE NODES INTERFACE
     The ubt driver can create or destroy endpoint device nodes on request.
     This feature can be used to implement external firmware download utility.

     The control transfers can only happen on the control endpoint which is
     always endpoint 0.  Control requests are issued by ioctl(2) calls.

     Only incoming transfers are supported on an interrupt endpoint.  To
     perform I/O on an interrupt endpoint, read(2) should be used.  All I/O
     operations on an interrupt endpoint are unbuffered.

     The bulk transfers can be in or out depending on the endpoint.  To
     perform I/O on a bulk endpoint, read(2) and write(2) should be used.  All
     I/O operations on a bulk endpoint are unbuffered.

     The control endpoint (endpoint 0) handles the following ioctl(2) calls:

     USB_GET_DEVICE_DESC (usb_device_descriptor_t)
             Return the device descriptor.

     USB_GET_STRING_DESC (struct usb_string_desc)
             Get a string descriptor for the given language ID and string
             index.

             struct usb_string_desc {
                     int                     string_index;
                     int                     language_id;
                     usb_string_descriptor_t desc;
             };

     USB_DO_REQUEST (struct usb_ctl_request)
             Send a USB request to the device on the control endpoint.  Any
             data sent to/from the device is located at data.  The size of the
             transferred data is determined from the request.  The addr field
             is ignored in this call.  The flags field can be used to flag
             that the request is allowed to be shorter than the requested
             size, and the actlen will contain the actual size on completion.

             struct usb_ctl_request {
                     int                  addr;
                     usb_device_request_t request;
                     void                 *data;
                     int                  flags;
             #define USBD_SHORT_XFER_OK   0x04    /* allow short reads */
                     int                  actlen; /* actual length transferred */
             };
             This is a dangerous operation in that it can perform arbitrary
             operations on the device.  Some of the most dangerous (e.g.,
             changing the device address) are not allowed.

     USB_GET_DEVICEINFO (struct usb_device_info)
             Get an information summary for the device.  This call will not
             issue any USB transactions.

SHUTDOWN
     This node shuts down when the corresponding USB device is un-plugged.

BUGS
     Isochronous USB transfers are broken.  It means that USB device will not
     be able to transfer SCO data (voice).  USB interrupt transfers are
     implemented as bulk-in transfers (not really a bug).

FILES
     /dev/ubtN.EE                           Endpoint EE of device N.

SEE ALSO
     netgraph(4), ugen(4), usb(4), ngctl(8)

HISTORY
     The ubt node type was implemented in FreeBSD 5.0.

AUTHORS
     Maksim Yevmenkin <m_evmenkin@yahoo.com>

FreeBSD 11.0-PRERELEASE          June 14, 2002         FreeBSD 11.0-PRERELEASE

NAME | SYNOPSIS | DESCRIPTION | HOOKS | CONTROL MESSAGES | DEVICE NODES INTERFACE | SHUTDOWN | BUGS | FILES | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=ng_ubt&sektion=4&manpath=FreeBSD+5.2.1-RELEASE>

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