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$Id: ng_ubt.4,v 1.3 2003/05/21 19:37:35 max Exp $
$FreeBSD: head/share/man/man4/ng_ubt.4 135321 2004-09-16 18:46:21Z brueffer $
.Dd September 13, 2004 .Dt NG_UBT 4 .Os .Sh NAME .Nm ng_ubt .Nd Netgraph node type that is also a driver for Bluetooth USB devices .Sh SYNOPSIS n sys/types.h n netgraph/bluetooth/include/ng_ubt.h .Sh DESCRIPTION The .Nm 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 a supported USB device is plugged in.
p The node has a single hook called .Dv 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 a HCI frame indicator if the device did not send it. HCI frames received on .Dv hook are transmitted out. The node will drop the HCI frame indicator unless the device requires it to be present. .Sh HARDWARE The .Nm driver supports all Bluetooth USB devices that conform with the Bluetooth specification v1.1, including:
p l -bullet -compact t 3Com 3CREB96 t AIPTEK BR0R02 t EPoX BT-DG02 t Mitsumi Bluetooth USB adapter t MSI MS-6967 t TDK Bluetooth USB adapter .El .Sh HOOKS This node type supports the following hooks: l -tag -width indent t Dv hook single HCI frame contained in a single .Vt mbuf structure. .El .Sh CONTROL MESSAGES This node type supports the generic control messages, plus the following: l -tag -width indent t Dv NGM_UBT_NODE_GET_DEBUG Returns an integer containing the current debug level for the node. t Dv NGM_UBT_NODE_SET_DEBUG This command takes an integer argument and sets the current debug level for the node. t Dv NGM_UBT_NODE_GET_QLEN This command takes a parameter that specifies the queue number and returns the current maximal length of the queue for the node. t Dv NGM_UBT_NODE_SET_QLEN This command takes two parameters that specify the queue number and the maximum length of the queue and sets the maximal length of the queue for the node. t Dv 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. t Dv NGM_UBT_NODE_RESET_STAT Reset all statistic counters to zero. t Dv NGM_UBT_NODE_DEV_NODES This command takes a 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 the device nodes for the endpoints. The device nodes interface is mutually exclusive with the Netgraph interface. .El .Sh DEVICE NODES INTERFACE The .Nm ubt driver can create or destroy endpoint device nodes on request. This feature can be used to implement an external firmware download utility.
p Control transfers can only happen on the control endpoint which is always endpoint 0. Control requests are issued by .Xr ioctl 2 calls.
p Only incoming transfers are supported on an interrupt endpoint. To perform I/O on an interrupt endpoint, .Xr read 2 should be used. All I/O operations on an interrupt endpoint are unbuffered.
p The bulk transfers can be in or out depending on the endpoint. To perform I/O on a bulk endpoint, .Xr read 2 and .Xr write 2 should be used. All I/O operations on a bulk endpoint are unbuffered.
p The control endpoint (endpoint 0) handles the following .Xr ioctl 2 calls: l -tag -width indent t Dv USB_GET_DEVICE_DESC Pq Vt usb_device_descriptor_t Return the device descriptor. t Dv USB_GET_STRING_DESC Pq Vt "struct usb_string_desc" Get a string descriptor for the given language ID and string index. d -literal struct usb_string_desc { int string_index; int language_id; usb_string_descriptor_t desc; }; .Ed t Dv USB_DO_REQUEST Pq Vt "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 .Va data . The size of the transferred data is determined from the .Va request . The .Va addr field is ignored in this call. The .Va flags field can be used to flag that the request is allowed to be shorter than the requested size, and the .Va actlen will contain the actual size on completion. d -literal 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 */ }; .Ed 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. t Dv USB_GET_DEVICEINFO Pq Vt "struct usb_device_info" Get an information summary for the device. This call will not issue any USB transactions. .El .Sh SHUTDOWN This node shuts down when the corresponding USB device is un-plugged. .Sh BUGS Isochronous USB transfers are broken. This means that the USB device will not be able to transfer SCO data (voice). USB interrupt transfers are implemented as bulk-in transfers (not really a bug). .Sh FILES l -tag -width ".Pa /dev/ubt Ns Ar N Ns Pa . Ns Ar EE" -compact t Pa /dev/ubt Ns Ar N Ns Pa . Ns Ar EE Endpoint .Ar EE of device .Ar N . .El .Sh SEE ALSO .Xr netgraph 4 , .Xr ugen 4 , .Xr usb 4 , .Xr ngctl 8 .Sh HISTORY The .Nm ubt node type was implemented in .Fx 5.0 . .Sh AUTHORS .An Maksim Yevmenkin Aq m_evmenkin@yahoo.com