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NG_UBT(4) BSD Kernel Interfaces Manual NG_UBT(4) NAME ng_ubt -- Netgraph node type that is also a driver for Bluetooth USB de- vices 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 indica- tor if device did not send it. HCI frames received on hook are transmit- ted 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: num- ber 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 per- form I/O on an interrupt endpoint, read(2) should be used. All I/O oper- ations on an interrupt endpoint are unbuffered. The bulk transfers can be in or out depending on the endpoint. To per- form 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 in- dex. 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 imple- mented 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> BSD June 14, 2002 BSD
NAME | SYNOPSIS | DESCRIPTION | HOOKS | CONTROL MESSAGES | DEVICE NODES INTERFACE | SHUTDOWN | BUGS | FILES | SEE ALSO | HISTORY | AUTHORS
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