[PATCH 4/4] Bluetooth: btintel: Add helper function to help controller type

[Kiran K <kiran.k@xxxxxxxxx>]

From: Raghuram Hegde <raghuram.hegde@xxxxxxxxx>

As the firmware download flow for new generation controller changes
from legacy controller, this function helps in deciding the download
flow to be used

Signed-off-by: Raghuram Hegde <raghuram.hegde@xxxxxxxxx>
Signed-off-by: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx>
Signed-off-by: Kiran K <kiran.k@xxxxxxxxx>
Signed-off-by: Amit K Bag <amit.k.bag@xxxxxxxxx>
---
 drivers/bluetooth/btintel.c | 51 +++++++++++++++++++++++++++++++++++++
 drivers/bluetooth/btintel.h |  3 +++
 2 files changed, 54 insertions(+)

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index ae60527e1abd..93a0e5a2e927 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -482,6 +482,57 @@ int btintel_read_version(struct hci_dev *hdev, struct intel_version *ver)
 }
 EXPORT_SYMBOL_GPL(btintel_read_version);
 
+int btintel_read_version_tlv(struct hci_dev *hdev, bool *is_tlv_format,
+			     struct sk_buff **skb_out)
+{
+	u8 param;
+	u8 status;
+	u8 tlv_check_octet;
+	u8 *data;
+	struct sk_buff *skb;
+
+	param = 0xFF;
+	skb_out = NULL;
+
+	skb = __hci_cmd_sync(hdev,  0xfc05, 1, &param, HCI_CMD_TIMEOUT);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Intel read version command failed (%ld)",
+			   PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+
+	/* Check status */
+	data = skb->data;
+	status = *data;
+	if (status) {
+		bt_dev_err(hdev, "Intel Read Version failed (%02x)",
+			   status);
+		kfree_skb(skb);
+		return -bt_to_errno(status);
+	}
+
+	/* There are two variants of HCI_Intel_Read_Version_Command_Complete
+	 * depending on SKU type (legacy and TLV format).If the skb->len
+	 * parameter is equal to INTEL_VERSION_LEN  and the first octet
+	 * after the status parameter is 0x37 then it's the legacy format,
+	 * otherwise it's TLV format
+	 */
+
+	/* Fetch the octet after status */
+	tlv_check_octet = *(data + 1);
+
+	if (skb->len == INTEL_VERSION_LEN && tlv_check_octet == 0x37) {
+		bt_dev_dbg(hdev, "Using Legacy Intel Version command");
+		*is_tlv_format = false;
+	} else {
+		bt_dev_dbg(hdev, "Using TLV format Version command");
+		*is_tlv_format = true;
+	}
+	*skb_out = skb;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(btintel_read_version_tlv);
+
 /* ------- REGMAP IBT SUPPORT ------- */
 
 #define IBT_REG_MODE_8BIT  0x00
diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h
index fa4b1b801b13..de2d104cb86d 100644
--- a/drivers/bluetooth/btintel.h
+++ b/drivers/bluetooth/btintel.h
@@ -6,6 +6,9 @@
  *  Copyright (C) 2015  Intel Corporation
  */
 
+/* Length of intel_version structure*/
+#define INTEL_VERSION_LEN	10
+
 struct intel_version {
 	u8 status;
 	u8 hw_platform;
-- 
2.17.1