Bluetooth: btintel, msft, sco, iso, l2cap: support SSP audio hardware offload - #6031

Set HCI_OFFLOAD_CODECS_ENABLED in btintel_configure_offload() when
0xfc86 (HCI_Intel_Read_Offload_Use_Cases) reports supported offload use
cases (preset[0] & 0x03), so hci_dev_open_sync() queries the
controller's local offload codecs (0x100d / 0x100e) during adapter
initialization.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Add HCI_OP_ENHANCED_ACCEPT_SYNC_CONN (0x043e) and hci_accept_sync()
so incoming eSCO/SCO connections on sockets configured with BT_CODEC
(data_path != 0) configure the controller data path (0x0c83) and
accept the synchronous connection over the offloaded PCM/SSP
transport instead of falling back to legacy
HCI_OP_ACCEPT_SYNC_CONN_REQ (0x0429).

Allow setting BT_CODEC on listening SCO sockets, propagate the
listening socket's codec settings onto conn in hci_conn_request_evt()
for non-deferred accepts as well as child sockets during
sco_sock_init(), and invoke hci_accept_sync() whenever an offloaded
data path is configured.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Enable DDC 0x0130 (0x3f: LC3, SCO, A2DP SBC/AAC, LE Audio vendor
codec, and controller delay reporting) and DDC 0x0120 (0x0b: SCO,
LE ISO, and A2DP offload use cases) via HCI_Intel_Write_DDC (0xfc8b)
during btintel_configure_offload() so
HCI_Read_Local_Supported_Codecs_v2 (0x100d) and
HCI_Read_Local_Supported_Codec_Capabilities (0x100e) report all
hardware offload codecs supported by operational firmware.

Extend btintel_get_codec_config_data() to configure 16 kHz SCO
presets (0x01) for non-CVSD SCO codecs and 48 kHz 16-bit stereo SSP
offload (preset 0x22) for ACL and LE CIS/BIS links.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Add BT_CODEC getsockopt and setsockopt support to BTPROTO_ISO (for
HCI_TRANSPORT_LE_CIS and HCI_TRANSPORT_LE_BIS offload codecs such as
LC3 and vendor LE Audio codecs) and BTPROTO_L2CAP (for
HCI_TRANSPORT_ACL A2DP offload codecs such as Intel SBC 0x0002:0x0000
and AAC 0x0002:0x0002), and export hci_configure_datapath() for use
by L2CAP and ISO data path setup.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Update hci_iso_setup_path() to configure the controller data path
(0x0c83) via hci_configure_datapath() and pass the requested
data_path, codec ID, and vendor CID/VID to HCI_LE_Setup_ISO_Data_Path
(0x206e) when offload is enabled.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Implement Microsoft HCI vendor extension (0xfc1e) subcommands
0x07..0x0b (HCI_VS_MSFT_Avdtp_Capabilities_Configuration, Avdtp_Open,
Avdtp_Start, Avdtp_Suspend, and Avdtp_Close) when
MSFT_FEATURE_MASK_AVDTP (BIT(10)) is advertised by the controller.

During msft_do_open(), query subcommand 0x07 and register the
controller's offloaded AVDTP Media Codec Service Capabilities (SBC
0x00 and MPEG-2,4 AAC 0x02) into hdev->local_codecs under
HCI_TRANSPORT_ACL.

When setsockopt(SOL_BLUETOOTH, BT_CODEC) is called on a connected
BR/EDR ACL BTPROTO_L2CAP channel, serialize stream transitions under
chan->avdtp_lock, validate supplied SBC/AAC capability TLVs and AAC
bitrates (>= 128 kbps), invoke msft_avdtp_open() to open and start
hardware A2DP offload on the controller's SSP TDM interface, and
automatically close any active stream on disable or L2CAP release.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Configure 8 kHz SSP PCM preset 0x00 in btintel_get_codec_config_data()
for 8 kHz synchronous codecs (0x00 u-law, 0x01 A-law, 0x02 CVSD, 0x03
Transparent, and 0x04 Linear PCM) while keeping 16 kHz preset 0x01
for 0x05 mSBC.

Update hci_enhanced_setup_sync() and hci_enhanced_accept_sync() to
pass the requested over-the-air coding format ID for G.711 u-law
(0x00) and A-law (0x01) connections instead of hardcoding CVSD (0x02).

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Support hardware LC3 offload over SSP for LE Audio CIS and BIS links:

- Validate and store user-supplied LC3 Codec_Specific_Configuration LTV
  capabilities from setsockopt(BT_CODEC) on iso_pi(sk) and hci_conn
  (checking Sampling_Frequency via btintel_get_codec_config_data()).
- Update btintel_lc3_freq_preset() to map LC3 Sampling_Frequency 16 kHz
  (0x03) to preset 0x01 and 48 kHz (0x08) to preset 0x22, rejecting
  unsupported rates with -EINVAL.
- Build direction-specific LC3 LTV configuration and QoS parameters for
  TX and RX paths (both ucast CIS and bcast BIS) in hci_iso_setup_path(),
  handling 75-octet 7.5 ms frames (48_1) cleanly when deriving defaults.
- Propagate listener codec configuration onto hci_conn before
  hci_iso_setup_path() runs in hci_le_cis_req_evt() and
  hci_le_big_sync_established_evt(), covering non-deferred CIS and BIG
  sync paths as well as BT_DEFER_SETUP and iso_conn_ready().

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>