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BTSCO(4) FreeBSD Kernel Interfaces Manual BTSCO(4) NAME btsco - Bluetooth SCO Audio SYNOPSIS btsco* at bthub? audio* at audiobus? DESCRIPTION The btsco driver provides support for Bluetooth SCO (Synchronous connection-oriented) Audio devices through the audio(4) driver. The btsco driver must be configured at run time with the btdevctl(8) program. The following properties are used by the btsco driver during autoconfiguration: local-bdaddr Local device address. remote-bdaddr Remote device address. service-name The btsco driver matches the `HF' and `HSET' services. For the `HF' service, the btsco device will, on open(2), listen for incoming connections from the remote device. Otherwise, btsco will attempt to initiate a connection to the remote device. rfcomm-channel This integer value is not used directly, but will be stored and passed via the BTSCO_INFO ioctl as below: SCO connections require a baseband connection between the two devices before they can be created. The btsco driver does not create this, but can provide information to facilitate an application setting up a control channel prior to use, via the BTSCO_INFO ioctl(2) call on the mixer device, which returns a btsco_info structure as follows: #include <dev/bluetooth/btsco.h> struct btsco_info { bdaddr_t laddr; /* controller bdaddr */ bdaddr_t raddr; /* headset bdaddr */ uint8_t channel; /* RFCOMM channel */ int vgs; /* mixer index speaker */ int vgm; /* mixer index mic */ }; #define BTSCO_INFO _IOR('b', 16, struct btsco_info) The btsco driver can be configured to act in Connect or Listen mode. In Connect mode, the btsco driver will initiate a connection to the remote device on an open(2) call, whereas in Listen mode, open(2) will block until the remote device initiates the connection. SEE ALSO bthset(1), ioctl(2), audio(4), bluetooth(4), bthub(4), btdevctl(8) HISTORY The btsco driver was written for NetBSD 4.0 by Iain Hibbert under the sponsorship of Itronix, Inc. BUGS btsco takes no notice of the HCI Voice Setting in the Bluetooth controller, and this must be 0x0060 (the default) as alternate values are currently unsupported. FreeBSD 14.1-RELEASE-p8 November 29, 2014 FreeBSD 14.1-RELEASE-p8