Bluetooth: Add enable_le module parameter

This patch adds a new module parameter to enable/disable host LE
support. By default host LE support is disabled.
Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

include/net/bluetooth/hci.h

@@ -211,6 +211,7 @@ enum {
 #define LMP_EDR_3S_ESCO	0x80
 
 #define LMP_EXT_INQ	0x01
+#define LMP_SIMUL_LE_BR	0x02
 #define LMP_SIMPLE_PAIR	0x08
 #define LMP_NO_FLUSH	0x40
 

net/bluetooth/hci_event.c

@@ -45,6 +45,8 @@
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
 
+static int enable_le;
+
 /* Handle HCI Event packets */
 
 static void hci_cc_inquiry_cancel(struct hci_dev *hdev, struct sk_buff *skb)
@@ -525,6 +527,20 @@ static void hci_setup_event_mask(struct hci_dev *hdev)
 	hci_send_cmd(hdev, HCI_OP_SET_EVENT_MASK, sizeof(events), events);
 }
 
+static void hci_set_le_support(struct hci_dev *hdev)
+{
+	struct hci_cp_write_le_host_supported cp;
+
+	memset(&cp, 0, sizeof(cp));
+
+	if (enable_le) {
+		cp.le = 1;
+		cp.simul = !!(hdev->features[6] & LMP_SIMUL_LE_BR);
+	}
+
+	hci_send_cmd(hdev, HCI_OP_WRITE_LE_HOST_SUPPORTED, sizeof(cp), &cp);
+}
+
 static void hci_setup(struct hci_dev *hdev)
 {
 	hci_setup_event_mask(hdev);
@@ -550,6 +566,9 @@ static void hci_setup(struct hci_dev *hdev)
 		hci_send_cmd(hdev, HCI_OP_READ_LOCAL_EXT_FEATURES,
 							sizeof(cp), &cp);
 	}
+
+	if (hdev->features[4] & LMP_LE)
+		hci_set_le_support(hdev);
 }
 
 static void hci_cc_read_local_version(struct hci_dev *hdev, struct sk_buff *skb)
@@ -3068,3 +3087,6 @@ void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
 	hci_send_to_sock(hdev, skb, NULL);
 	kfree_skb(skb);
 }
+
+module_param(enable_le, bool, 0444);
+MODULE_PARM_DESC(enable_le, "Enable LE support");