BTSCO(4) | Device Drivers Manual | BTSCO(4) |
btsco
— Bluetooth
SCO Audio
btsco* at bthub?
audio* at audiobus?
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:
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.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 controller, and this must be 0x0060 (the default)
as alternate values are currently unsupported.
November 29, 2014 | NetBSD 10.99 |