Bluetooth: aosp: Support AOSP Bluetooth Quality Report

This patch adds the support of the AOSP Bluetooth Quality Report
(BQR) events.

Multiple vendors have supported the AOSP Bluetooth Quality Report.
When a Bluetooth controller supports the capability, it can enable
the aosp capability through hci_set_aosp_capable. Then hci_core will
set up the hdev->aosp_set_quality_report callback through aosp_do_open
if the controller responds to support the quality report capability.

Note that Intel also supports a distinct telemetry quality report
specification. Intel sets up the hdev->set_quality_report callback
in the btusb driver module.

Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Joseph Hwang <josephsih@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 87 insertions, 0 deletions

diff --git a/net/bluetooth/aosp.c b/net/bluetooth/aosp.c
index 871e889b7e17..432ae3aac9e3 100644
--- a/net/bluetooth/aosp.c
+++ b/net/bluetooth/aosp.c
@@ -112,3 +112,90 @@ void aosp_do_close(struct hci_dev *hdev)
 
 	bt_dev_dbg(hdev, "Cleanup of AOSP extension");
 }
+
+/* BQR command */
+#define BQR_OPCODE			hci_opcode_pack(0x3f, 0x015e)
+
+/* BQR report action */
+#define REPORT_ACTION_ADD		0x00
+#define REPORT_ACTION_DELETE		0x01
+#define REPORT_ACTION_CLEAR		0x02
+
+/* BQR event masks */
+#define QUALITY_MONITORING		BIT(0)
+#define APPRAOCHING_LSTO		BIT(1)
+#define A2DP_AUDIO_CHOPPY		BIT(2)
+#define SCO_VOICE_CHOPPY		BIT(3)
+
+#define DEFAULT_BQR_EVENT_MASK	(QUALITY_MONITORING | APPRAOCHING_LSTO | \
+				 A2DP_AUDIO_CHOPPY | SCO_VOICE_CHOPPY)
+
+/* Reporting at milliseconds so as not to stress the controller too much.
+ * Range: 0 ~ 65535 ms
+ */
+#define DEFALUT_REPORT_INTERVAL_MS	5000
+
+struct aosp_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 aosp_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 aosp_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;
+}
+
+bool aosp_has_quality_report(struct hci_dev *hdev)
+{
+	return hdev->aosp_quality_report;
+}
+
+int aosp_set_quality_report(struct hci_dev *hdev, bool enable)
+{
+	if (!aosp_has_quality_report(hdev))
+		return -EOPNOTSUPP;
+
+	bt_dev_dbg(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);
+}