[PATCH v3 1/2] Bluetooth: Add support to read Intel debug feature

[Kiran K <kiran.k@xxxxxxxxx>]

From: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx>

The command shall read the Intel controller supported
debug feature. Based on the supported features additional debug
configuration shall be enabled.

Signed-off-by: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx>
Signed-off-by: Ps AyappadasX <AyappadasX.Ps@xxxxxxxxx>
Signed-off-by: Kiran K <kiran.k@xxxxxxxxx>
---
 drivers/bluetooth/btintel.c | 33 +++++++++++++++++++++++++++++++++
 drivers/bluetooth/btintel.h | 15 +++++++++++++++
 drivers/bluetooth/btusb.c   |  7 ++++++-
 3 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index 6a0e2c5a8beb..cb7d62883b18 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -754,6 +754,39 @@ void btintel_reset_to_bootloader(struct hci_dev *hdev)
 }
 EXPORT_SYMBOL_GPL(btintel_reset_to_bootloader);
 
+int btintel_read_debug_features(struct hci_dev *hdev,
+				struct intel_debug_features *features)
+{
+	struct sk_buff *skb;
+	u8 page_no = 1;
+
+	/* Intel controller supports two pages, each page is of 128-bit
+	 * feature bit mask. And each bit defines specific feature support
+	 */
+	skb = __hci_cmd_sync(hdev, 0xfca6, sizeof(page_no), &page_no,
+			     HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Reading supported features(page1) failed (%ld)",
+			   PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+
+	if (skb->len != (sizeof(features->page1) + 3)) {
+		bt_dev_err(hdev,
+			   "Supported feature(page1) event size mismatch");
+		kfree_skb(skb);
+		return -EILSEQ;
+	}
+
+	memcpy(features->page1, skb->data + 3, sizeof(features->page1));
+
+	/* Read the supported features page2 if required in future.
+	 */
+	kfree_skb(skb);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(btintel_read_debug_features);
+
 MODULE_AUTHOR("Marcel Holtmann <marcel@xxxxxxxxxxxx>");
 MODULE_DESCRIPTION("Bluetooth support for Intel devices ver " VERSION);
 MODULE_VERSION(VERSION);
diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h
index a69ea8a87b9b..7cd813fc5db4 100644
--- a/drivers/bluetooth/btintel.h
+++ b/drivers/bluetooth/btintel.h
@@ -62,6 +62,10 @@ struct intel_reset {
 	__le32   boot_param;
 } __packed;
 
+struct intel_debug_features {
+	__u8    page1[16];
+} __packed;
+
 #if IS_ENABLED(CONFIG_BT_INTEL)
 
 int btintel_check_bdaddr(struct hci_dev *hdev);
@@ -88,6 +92,10 @@ int btintel_read_boot_params(struct hci_dev *hdev,
 int btintel_download_firmware(struct hci_dev *dev, const struct firmware *fw,
 			      u32 *boot_param);
 void btintel_reset_to_bootloader(struct hci_dev *hdev);
+
+int btintel_read_debug_features(struct hci_dev *hdev,
+				struct intel_debug_features *features);
+
 #else
 
 static inline int btintel_check_bdaddr(struct hci_dev *hdev)
@@ -186,4 +194,11 @@ static inline int btintel_download_firmware(struct hci_dev *dev,
 static inline void btintel_reset_to_bootloader(struct hci_dev *hdev)
 {
 }
+
+static inline int btintel_read_debug_features(struct hci_dev *hdev,
+					      struct intel_debug_features *features)
+{
+	return -EOPNOTSUPP;
+}
+
 #endif
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 5f022e9cf667..1d36141ebe65 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -5,7 +5,6 @@
  *
  *  Copyright (C) 2005-2008  Marcel Holtmann <marcel@xxxxxxxxxxxx>
  */
-
 #include <linux/dmi.h>
 #include <linux/module.h>
 #include <linux/usb.h>
@@ -2273,6 +2272,7 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 	ktime_t calltime, delta, rettime;
 	unsigned long long duration;
 	int err;
+	struct intel_debug_features debug_features;
 
 	BT_DBG("%s", hdev->name);
 
@@ -2542,6 +2542,11 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
 	 */
 	btintel_load_ddc_config(hdev, fwname);
 
+	/* Read the Intel supported features and if new exception formats
+	 * supported, need to load the additional DDC config to enable.
+	 */
+	btintel_read_debug_features(hdev, &debug_features);
+
 	/* Read the Intel version information after loading the FW  */
 	err = btintel_read_version(hdev, &ver);
 	if (err)
-- 
2.17.1