diff options
| author | Hsin-chen Chuang <chharry@chromium.org> | 2025-02-28 01:14:10 +0800 |
|---|---|---|
| committer | Luiz Augusto von Dentz <luiz.von.dentz@intel.com> | 2025-03-07 12:43:27 -0500 |
| commit | 75ddcd5ad40ecd9fbc9f5a7a2ed0e1e74921db3c (patch) | |
| tree | 2886d1050b7905b09d900cb89e40e62d13e94c2a /drivers/bluetooth/Kconfig | |
| parent | fc14f9c02639dfbfe3529850eae23aef077939a6 (diff) | |
Bluetooth: btusb: Configure altsetting for HCI_USER_CHANNEL
Automatically configure the altsetting for HCI_USER_CHANNEL when a SCO
is connected.
The motivation is to enable the HCI_USER_CHANNEL user to send out SCO
data through USB Bluetooth chips, which is mainly used for bidirectional
audio transfer (voice call). This was not capable because:
- Per Bluetooth Core Spec v5, Vol 4, Part B, 2.1, the corresponding
alternate setting should be set based on the air mode in order to
transfer SCO data, but
- The Linux Bluetooth HCI_USER_CHANNEL exposes the Bluetooth Host
Controller Interface to the user space, which is something above the
USB layer. The user space is not able to configure the USB alt while
keeping the channel open.
This patch intercepts the HCI_EV_SYNC_CONN_COMPLETE packets in btusb,
extracts the air mode, and configures the alt setting in btusb.
This patch is tested on ChromeOS devices. The USB Bluetooth models
(CVSD, TRANS alt3 and alt6) could work without a customized kernel.
Fixes: b16b327edb4d ("Bluetooth: btusb: add sysfs attribute to control USB alt setting")
Signed-off-by: Hsin-chen Chuang <chharry@chromium.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Diffstat (limited to 'drivers/bluetooth/Kconfig')
| -rw-r--r-- | drivers/bluetooth/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig index 4ab32abf0f48..7771edf54fb3 100644 --- a/drivers/bluetooth/Kconfig +++ b/drivers/bluetooth/Kconfig @@ -56,6 +56,18 @@ config BT_HCIBTUSB_POLL_SYNC Say Y here to enable USB poll_sync for Bluetooth USB devices by default. +config BT_HCIBTUSB_AUTO_ISOC_ALT + bool "Automatically adjust alternate setting for Isoc endpoints" + depends on BT_HCIBTUSB + default y if CHROME_PLATFORMS + help + Say Y here to automatically adjusting the alternate setting for + HCI_USER_CHANNEL whenever a SCO link is established. + + When enabled, btusb intercepts the HCI_EV_SYNC_CONN_COMPLETE packets + and configures isoc endpoint alternate setting automatically when + HCI_USER_CHANNEL is in use. + config BT_HCIBTUSB_BCM bool "Broadcom protocol support" depends on BT_HCIBTUSB |