Bluetooth: hci_bcm: Enable parsing of LM_DIAG messages

The Broadcom UART based controllers can send LM_DIAG messages with the
identifier 0x07 inside the HCI stream. These messages are 63 octets in
size and have no variable payload or length indicator.

This patch adds correct parsing information for the h4_recv_buf handler
and in case these packets are received, they are forwarded to the
Bluetooth core via hci_recv_diag interface.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

drivers/bluetooth/hci_bcm.c

@@ -41,6 +41,9 @@
 #include "btbcm.h"
 #include "hci_uart.h"
 
+#define BCM_LM_DIAG_PKT 0x07
+#define BCM_LM_DIAG_SIZE 63
+
 #define BCM_AUTOSUSPEND_DELAY	5000 /* default autosleep delay */
 
 struct bcm_device {
@@ -396,10 +399,18 @@ static int bcm_setup(struct hci_uart *hu)
 	return err;
 }
 
+#define BCM_RECV_LM_DIAG \
+	.type = BCM_LM_DIAG_PKT, \
+	.hlen = BCM_LM_DIAG_SIZE, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = BCM_LM_DIAG_SIZE
+
 static const struct h4_recv_pkt bcm_recv_pkts[] = {
-	{ H4_RECV_ACL,   .recv = hci_recv_frame },
-	{ H4_RECV_SCO,   .recv = hci_recv_frame },
-	{ H4_RECV_EVENT, .recv = hci_recv_frame },
+	{ H4_RECV_ACL,      .recv = hci_recv_frame },
+	{ H4_RECV_SCO,      .recv = hci_recv_frame },
+	{ H4_RECV_EVENT,    .recv = hci_recv_frame },
+	{ BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
 };
 
 static int bcm_recv(struct hci_uart *hu, const void *data, int count)