tree a42fe58da21e9056bd93fd423baf8ebdc2700512
parent 1a4c958cf9b1e159bc63d63b9e362904dd2c4ac3
author Frédéric Dalleau <frederic.dalleau@linux.intel.com> 1376915043 +0200
committer Gustavo Padovan <gustavo.padovan@collabora.co.uk> 1377096433 +0200

Bluetooth: Add SCO connection fallback

When initiating a transparent eSCO connection, make use of T2 settings
at first try. T2 is the recommended settings from HFP 1.6 WideBand
Speech. Upon connection failure, try T1 settings.

When CVSD is requested and eSCO is supported, try to establish eSCO
connection using S3 settings. If it fails, fallback in sequence to S2,
S1, D1, D0 settings.

To know which setting should be used, conn->attempt is used. It
indicates the currently ongoing SCO connection attempt and can be used
as the index for the fallback settings table.

These setting and the fallback order are described in Bluetooth HFP 1.6
specification p. 101.

Signed-off-by: Frédéric Dalleau <frederic.dalleau@linux.intel.com>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>