October 4, 2006 BTSCO 4

### NAME

btsco - Bluetooth SCO Audio

### SYNOPSIS

btsco* at bthub? audio* at audiobus?

### DESCRIPTION

The btsco driver provides support for Bluetooth SCO 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 initate 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 NetBSD4.0 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.