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Date: Mon, 13 Sep 2021 15:28:36 +0800
From: Joseph Hwang <josephsih@...omium.org>
To: linux-bluetooth@...r.kernel.org, marcel@...tmann.org,
luiz.dentz@...il.com, pali@...nel.org
Cc: josephsih@...gle.com, chromeos-bluetooth-upstreaming@...omium.org,
Joseph Hwang <josephsih@...omium.org>,
kernel test robot <lkp@...el.com>,
Miao-chen Chou <mcchou@...omium.org>,
Johan Hedberg <johan.hedberg@...il.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/3] Bluetooth: btandroid: Support Android Bluetooth Quality Report
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@...el.com>
Reviewed-by: Miao-chen Chou <mcchou@...omium.org>
Signed-off-by: Joseph Hwang <josephsih@...omium.org>
---
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
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