The voice setting is used by sco_connect() or sco_conn_defer_accept()
after being set by sco_sock_setsockopt().
The PCM part of the voice setting is used for offload mode through PCM
chipset port.
This commits add support for mSBC 16 bits offloading, i.e. audio data
not transported over HCI.
The BCM4349B1 supports 16 bits transparent data on its I2S port.
If BT_VOICE_TRANSPARENT is used when accepting a SCO connection, this
gives only garbage audio while using BT_VOICE_TRANSPARENT_16BIT gives
correct audio.
This has been tested with connection to iPhone 14 and Samsung S24.
Signed-off-by: Frédéric Danis <frederic.danis@xxxxxxxxxxxxx>
---
v1 -> v2: Enhance commit message
v2 -> v3: Enhance commit message
include/net/bluetooth/bluetooth.h | 1 +
net/bluetooth/sco.c | 7 +++++--
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index e6760c11f007..435250c72d56 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -123,6 +123,7 @@ struct bt_voice {
#define BT_VOICE_TRANSPARENT 0x0003
#define BT_VOICE_CVSD_16BIT 0x0060
+#define BT_VOICE_TRANSPARENT_16BIT 0x0063
#define BT_SNDMTU 12
#define BT_RCVMTU 13
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 7eb8d3e04ec4..7b54d8826bcc 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -319,7 +319,8 @@ static int sco_connect(struct sock *sk)
else
type = SCO_LINK;
- if (sco_pi(sk)->setting == BT_VOICE_TRANSPARENT &&
+ if ((sco_pi(sk)->setting == BT_VOICE_TRANSPARENT ||
+ sco_pi(sk)->setting == BT_VOICE_TRANSPARENT_16BIT) &&
(!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev))) {
err = -EOPNOTSUPP;
goto unlock;
@@ -922,6 +923,7 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
/* Explicitly check for these values */
if (voice.setting != BT_VOICE_TRANSPARENT &&
+ voice.setting != BT_VOICE_TRANSPARENT_16BIT &&
voice.setting != BT_VOICE_CVSD_16BIT) {
err = -EINVAL;
break;
@@ -935,7 +937,8 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
break;
}
if (enhanced_sync_conn_capable(hdev) &&
- voice.setting == BT_VOICE_TRANSPARENT)
+ (voice.setting == BT_VOICE_TRANSPARENT ||
+ voice.setting == BT_VOICE_TRANSPARENT_16BIT))
sco_pi(sk)->codec.id = BT_CODEC_TRANSPARENT;
hci_dev_put(hdev);
break;
--
2.34.1
