BTSCO(4)                NetBSD Kernel Interfaces Manual               BTSCO(4)

     btsco -- Bluetooth SCO Audio

     btsco*    at bthub?
     audio*    at audiobus?

     The btsco driver provides support for Bluetooth SCO (Synchronous connec-
     tion-oriented) Audio devices through the audio(4) driver.

     The btsco driver must be configured at run time with the btdevctl(8) pro-
     gram.  The following properties are used by the btsco driver during auto-

               Local device address.

               Remote device address.

               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.

               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.

     bthset(1), ioctl(2), audio(4), bluetooth(4), bthub(4), btdevctl(8)

     The btsco driver was written for NetBSD 4.0 by Iain Hibbert under the
     sponsorship of Itronix, Inc.

     btsco takes no notice of the HCI Voice Setting in the Bluetooth con-
     troller, and this must be 0x0060 (the default) as alternate values are
     currently unsupported.

NetBSD 8.0                     November 29, 2014                    NetBSD 8.0

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