Add the btandroid.c file to support Android BQR commands. This module may be referenced by btusb, btrtl, and hci_qca when a Bluetooth controller supports the Android Bluetooth Quality Report. Reported-by: kernel test robot <lkp@xxxxxxxxx> Reviewed-by: Miao-chen Chou <mcchou@xxxxxxxxxxxx> Signed-off-by: Joseph Hwang <josephsih@xxxxxxxxxxxx> --- Changes in v3: - Fix the auto build test ERROR "undefined symbol: btandroid_set_quality_report" that occurred with some kernel configs. - Note that the mgmt-tester "Read Exp Feature - Success" failed. But on my test device, the same test passed. Please kindly let me know what may be going wrong. These patches do not actually modify read/set experimental features. - As to CheckPatch failed. No need to modify the MAINTAINERS file. Thanks. Changes in v2: - Fix the titles of patches 2/3 and 3/3 and reduce their lengths. drivers/bluetooth/Kconfig | 5 ++ drivers/bluetooth/Makefile | 1 + drivers/bluetooth/btandroid.c | 106 ++++++++++++++++++++++++++++++++++ drivers/bluetooth/btandroid.h | 10 ++++ 4 files changed, 122 insertions(+) create mode 100644 drivers/bluetooth/btandroid.c create mode 100644 drivers/bluetooth/btandroid.h diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig index 851842372c9b..0be352cdc6c9 100644 --- a/drivers/bluetooth/Kconfig +++ b/drivers/bluetooth/Kconfig @@ -19,10 +19,14 @@ config BT_QCA tristate select FW_LOADER +config BT_HCIBTANDROID + tristate + config BT_HCIBTUSB tristate "HCI USB driver" depends on USB select BT_INTEL + select BT_HCIBTANDROID help Bluetooth HCI USB driver. This driver is required if you want to use Bluetooth devices with @@ -90,6 +94,7 @@ config BT_HCIUART depends on SERIAL_DEV_BUS || !SERIAL_DEV_BUS depends on NVMEM || !NVMEM depends on TTY + select BT_HCIBTANDROID help Bluetooth HCI UART driver. This driver is required if you want to use Bluetooth devices with diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile index 16286ea2655d..3a2ca2eb7cd7 100644 --- a/drivers/bluetooth/Makefile +++ b/drivers/bluetooth/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_BT_HCIBT3C) += bt3c_cs.o obj-$(CONFIG_BT_HCIBLUECARD) += bluecard_cs.o obj-$(CONFIG_BT_HCIBTUSB) += btusb.o +obj-$(CONFIG_BT_HCIBTANDROID) += btandroid.o obj-$(CONFIG_BT_HCIBTSDIO) += btsdio.o obj-$(CONFIG_BT_INTEL) += btintel.o diff --git a/drivers/bluetooth/btandroid.c b/drivers/bluetooth/btandroid.c new file mode 100644 index 000000000000..fffacc8d67cc --- /dev/null +++ b/drivers/bluetooth/btandroid.c @@ -0,0 +1,106 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Support for Android Bluetooth Quality Report (BQR) specifications + * https://source.android.com/devices/bluetooth/hci_requirements + * + * Copyright (C) 2021 Google Corporation + */ + +#include <linux/module.h> + +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci.h> + +#include "btandroid.h" + +#define VERSION "0.1" + +/* + * Reference for the command op codes and parameters below: + * https://source.android.com/devices/bluetooth/hci_requirements#bluetooth-quality-report-command + */ +#define BQR_COMMAND_OCF 0x015e +#define BQR_OPCODE hci_opcode_pack(0x3f, BQR_COMMAND_OCF) + +/* report action */ +#define REPORT_ACTION_ADD 0x00 +#define REPORT_ACTION_DELETE 0x01 +#define REPORT_ACTION_CLEAR 0x02 + +/* BQR event masks */ +#define QUALITY_MONITORING (1 << 0) +#define APPRAOCHING_LSTO (1 << 1) +#define A2DP_AUDIO_CHOPPY (1 << 2) +#define SCO_VOICE_CHOPPY (1 << 3) + +#define DEFAULT_BQR_EVENT_MASK (QUALITY_MONITORING | APPRAOCHING_LSTO | \ + A2DP_AUDIO_CHOPPY | SCO_VOICE_CHOPPY) + +/* + * Reporting at seconds so as not to stress the controller too much. + * Range: 0 ~ 65535 ms + */ +#define DEFALUT_REPORT_INTERVAL_MS 5000 + +struct android_bqr_cp { + __u8 report_action; + __u32 event_mask; + __u16 min_report_interval; +} __packed; + +static int enable_quality_report(struct hci_dev *hdev) +{ + struct sk_buff *skb; + struct android_bqr_cp cp; + + cp.report_action = REPORT_ACTION_ADD; + cp.event_mask = DEFAULT_BQR_EVENT_MASK; + cp.min_report_interval = DEFALUT_REPORT_INTERVAL_MS; + + skb = __hci_cmd_sync(hdev, BQR_OPCODE, sizeof(cp), &cp, + HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_err(hdev, "Enabling Android BQR failed (%ld)", + PTR_ERR(skb)); + return PTR_ERR(skb); + } + + kfree_skb(skb); + return 0; +} + +static int disable_quality_report(struct hci_dev *hdev) +{ + struct sk_buff *skb; + struct android_bqr_cp cp = { 0 }; + + cp.report_action = REPORT_ACTION_CLEAR; + + skb = __hci_cmd_sync(hdev, BQR_OPCODE, sizeof(cp), &cp, + HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_err(hdev, "Disabling Android BQR failed (%ld)", + PTR_ERR(skb)); + return PTR_ERR(skb); + } + + kfree_skb(skb); + return 0; +} + +int btandroid_set_quality_report(struct hci_dev *hdev, bool enable) +{ + bt_dev_info(hdev, "quality report enable %d", enable); + + /* Enable or disable the quality report feature. */ + if (enable) + return enable_quality_report(hdev); + else + return disable_quality_report(hdev); +} +EXPORT_SYMBOL_GPL(btandroid_set_quality_report); + +MODULE_AUTHOR("Google"); +MODULE_DESCRIPTION("Support for Android Bluetooth Specification " VERSION); +MODULE_VERSION(VERSION); +MODULE_LICENSE("GPL"); diff --git a/drivers/bluetooth/btandroid.h b/drivers/bluetooth/btandroid.h new file mode 100644 index 000000000000..6abc9e8e0838 --- /dev/null +++ b/drivers/bluetooth/btandroid.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Bluetooth support for Android specifications + * + * Copyright (C) 2021 Google Corporation + */ + +#include <net/bluetooth/hci_core.h> + +int btandroid_set_quality_report(struct hci_dev *hdev, bool enable); -- 2.33.0.309.g3052b89438-goog
