[PATCH 1/2] Bluetooth: btusb: Record debug log for Mediatek Chip.

[mark-yw.chen at mediatek.com]

From: "mark-yw.chen" <mark-yw.chen at mediatek.com>

1. Add btusb_recv_bulk_mtk to receive debug log.
2. Send the debug log via hci_recv_diag channel.
3. The upper layerd use hci_channel_minitor to receive
   these packets.

Signed-off-by: mark-yw.chen <mark-yw.chen at mediatek.com>
---
 drivers/bluetooth/btusb.c | 67 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index b015dcecfb13..2a55ae0a5f8c 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3851,6 +3851,72 @@ static int btusb_mtk_shutdown(struct hci_dev *hdev)
 	return 0;
 }
 
+static int btusb_recv_bulk_mtk(struct btusb_data *data, void *buffer, int count)
+{
+	struct sk_buff *skb;
+	unsigned long flags;
+	int err = 0;
+
+	spin_lock_irqsave(&data->rxlock, flags);
+	skb = data->acl_skb;
+
+	while (count) {
+		int len;
+
+		if (!skb) {
+			skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
+			if (!skb) {
+				err = -ENOMEM;
+				break;
+			}
+
+			hci_skb_pkt_type(skb) = HCI_ACLDATA_PKT;
+			hci_skb_expect(skb) = HCI_ACL_HDR_SIZE;
+		}
+
+		len = min_t(uint, hci_skb_expect(skb), count);
+		skb_put_data(skb, buffer, len);
+
+		count -= len;
+		buffer += len;
+		hci_skb_expect(skb) -= len;
+
+		if (skb->len == HCI_ACL_HDR_SIZE) {
+			__le16 dlen = hci_acl_hdr(skb)->dlen;
+
+			/* Complete ACL header */
+			hci_skb_expect(skb) = __le16_to_cpu(dlen);
+
+			if (skb_tailroom(skb) < hci_skb_expect(skb)) {
+				kfree_skb(skb);
+				skb = NULL;
+
+				err = -EILSEQ;
+				break;
+			}
+		}
+
+		if (!hci_skb_expect(skb)) {
+			/* Complete frame */
+			if (skb->data[0] == 0x6f && skb->data[1] == 0xfc) {
+				usb_disable_autosuspend(data->udev);
+				hci_recv_diag(data->hdev, skb);
+			} else if ((skb->data[0] == 0xfe || skb->data[0] == 0xff) &&
+				   skb->data[1] == 0x05) {
+				hci_recv_diag(data->hdev, skb);
+			} else {
+				hci_recv_frame(data->hdev, skb);
+			}
+			skb = NULL;
+		}
+	}
+
+	data->acl_skb = skb;
+	spin_unlock_irqrestore(&data->rxlock, flags);
+
+	return err;
+}
+
 MODULE_FIRMWARE(FIRMWARE_MT7663);
 MODULE_FIRMWARE(FIRMWARE_MT7668);
 
@@ -4669,6 +4735,7 @@ static int btusb_probe(struct usb_interface *intf,
 		hdev->setup = btusb_mtk_setup;
 		hdev->shutdown = btusb_mtk_shutdown;
 		hdev->manufacturer = 70;
+		data->recv_bulk = btusb_recv_bulk_mtk;
 		set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
 	}
 
-- 
2.18.0