[Bluetooth] Support raw mode only devices

This patch introduces a quirk flag for turning a device into a raw
mode only device.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci.h

@@ -53,7 +53,8 @@
 
 /* HCI device quirks */
 enum {
-	HCI_QUIRK_RESET_ON_INIT
+	HCI_QUIRK_RESET_ON_INIT,
+	HCI_QUIRK_RAW_DEVICE
 };
 
 /* HCI device flags */

net/bluetooth/hci_core.c

@@ -457,6 +457,9 @@ int hci_dev_open(__u16 dev)
 		goto done;
 	}
 
+	if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
+		set_bit(HCI_RAW, &hdev->flags);
+
 	if (hdev->open(hdev)) {
 		ret = -EIO;
 		goto done;
@@ -532,9 +535,11 @@ static int hci_dev_do_close(struct hci_dev *hdev)
 	/* Reset device */
 	skb_queue_purge(&hdev->cmd_q);
 	atomic_set(&hdev->cmd_cnt, 1);
-	set_bit(HCI_INIT, &hdev->flags);
-	__hci_request(hdev, hci_reset_req, 0, HZ/4);
-	clear_bit(HCI_INIT, &hdev->flags);
+	if (!test_bit(HCI_RAW, &hdev->flags)) {
+		set_bit(HCI_INIT, &hdev->flags);
+		__hci_request(hdev, hci_reset_req, 0, HZ/4);
+		clear_bit(HCI_INIT, &hdev->flags);
+	}
 
 	/* Kill cmd task */
 	tasklet_kill(&hdev->cmd_task);
@@ -604,7 +609,8 @@ int hci_dev_reset(__u16 dev)
 	atomic_set(&hdev->cmd_cnt, 1); 
 	hdev->acl_cnt = 0; hdev->sco_cnt = 0;
 
-	ret = __hci_request(hdev, hci_reset_req, 0, HCI_INIT_TIMEOUT);
+	if (!test_bit(HCI_RAW, &hdev->flags))
+		ret = __hci_request(hdev, hci_reset_req, 0, HCI_INIT_TIMEOUT);
 
 done:
 	tasklet_enable(&hdev->tx_task);
@@ -1192,10 +1198,12 @@ static inline void hci_sched_acl(struct hci_dev *hdev)
 
 	BT_DBG("%s", hdev->name);
 
-	/* ACL tx timeout must be longer than maximum
-	 * link supervision timeout (40.9 seconds) */
-	if (!hdev->acl_cnt && (jiffies - hdev->acl_last_tx) > (HZ * 45))
-		hci_acl_tx_to(hdev);
+	if (!test_bit(HCI_RAW, &hdev->flags)) {
+		/* ACL tx timeout must be longer than maximum
+		 * link supervision timeout (40.9 seconds) */
+		if (!hdev->acl_cnt && (jiffies - hdev->acl_last_tx) > (HZ * 45))
+			hci_acl_tx_to(hdev);
+	}
 
 	while (hdev->acl_cnt && (conn = hci_low_sent(hdev, ACL_LINK, &quote))) {
 		while (quote-- && (skb = skb_dequeue(&conn->data_q))) {

net/bluetooth/hci_sock.c

@@ -179,6 +179,9 @@ static inline int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd, unsign
 		if (!capable(CAP_NET_ADMIN))
 			return -EACCES;
 
+		if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
+			return -EPERM;
+
 		if (arg)
 			set_bit(HCI_RAW, &hdev->flags);
 		else