[Bluetooth] Add automatic sniff mode support

This patch introduces the automatic sniff mode feature. This allows
the host to switch idle connections into sniff mode to safe power.

Signed-off-by: Ulisses Furquim <ulissesf@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

7 files changed, 454 insertions, 86 deletions

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 99c53f6b825274..b2bdb1aa04291c 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -101,9 +101,10 @@ enum {
 #define HCIINQUIRY	_IOR('H', 240, int)
 
 /* HCI timeouts */
-#define HCI_CONN_TIMEOUT	(HZ * 40)
-#define HCI_DISCONN_TIMEOUT	(HZ * 2)
-#define HCI_CONN_IDLE_TIMEOUT	(HZ * 60)
+#define HCI_CONNECT_TIMEOUT	(40000)	/* 40 seconds */
+#define HCI_DISCONN_TIMEOUT	(2000)	/* 2 seconds */
+#define HCI_IDLE_TIMEOUT	(6000)	/* 6 seconds */
+#define HCI_INIT_TIMEOUT	(10000)	/* 10 seconds */
 
 /* HCI Packet types */
 #define HCI_COMMAND_PKT		0x01
@@ -145,7 +146,7 @@ enum {
 #define LMP_TACCURACY	0x10
 #define LMP_RSWITCH	0x20
 #define LMP_HOLD	0x40
-#define LMP_SNIF	0x80
+#define LMP_SNIFF	0x80
 
 #define LMP_PARK	0x01
 #define LMP_RSSI	0x02
@@ -160,13 +161,21 @@ enum {
 #define LMP_PSCHEME	0x02
 #define LMP_PCONTROL	0x04
 
+#define LMP_SNIFF_SUBR	0x02
+
+/* Connection modes */
+#define HCI_CM_ACTIVE	0x0000
+#define HCI_CM_HOLD	0x0001
+#define HCI_CM_SNIFF	0x0002
+#define HCI_CM_PARK	0x0003
+
 /* Link policies */
 #define HCI_LP_RSWITCH	0x0001
 #define HCI_LP_HOLD	0x0002
 #define HCI_LP_SNIFF	0x0004
 #define HCI_LP_PARK	0x0008
 
-/* Link mode */
+/* Link modes */
 #define HCI_LM_ACCEPT	0x8000
 #define HCI_LM_MASTER	0x0001
 #define HCI_LM_AUTH	0x0002
@@ -192,7 +201,7 @@ struct hci_rp_read_loc_version {
 } __attribute__ ((packed));
 
 #define OCF_READ_LOCAL_FEATURES	0x0003
-struct hci_rp_read_loc_features {
+struct hci_rp_read_local_features {
 	__u8 status;
 	__u8 features[8];
 } __attribute__ ((packed));
@@ -376,17 +385,32 @@ struct hci_cp_change_conn_link_key {
 } __attribute__ ((packed));
 
 #define OCF_READ_REMOTE_FEATURES 0x001B
-struct hci_cp_read_rmt_features {
+struct hci_cp_read_remote_features {
 	__le16   handle;
 } __attribute__ ((packed));
 
 #define OCF_READ_REMOTE_VERSION 0x001D
-struct hci_cp_read_rmt_version {
+struct hci_cp_read_remote_version {
 	__le16   handle;
 } __attribute__ ((packed));
 
 /* Link Policy */
-#define OGF_LINK_POLICY	 0x02   
+#define OGF_LINK_POLICY	0x02   
+
+#define OCF_SNIFF_MODE		0x0003
+struct hci_cp_sniff_mode {
+	__le16   handle;
+	__le16   max_interval;
+	__le16   min_interval;
+	__le16   attempt;
+	__le16   timeout;
+} __attribute__ ((packed));
+
+#define OCF_EXIT_SNIFF_MODE	0x0004
+struct hci_cp_exit_sniff_mode {
+	__le16   handle;
+} __attribute__ ((packed));
+
 #define OCF_ROLE_DISCOVERY	0x0009
 struct hci_cp_role_discovery {
 	__le16   handle;
@@ -407,7 +431,7 @@ struct hci_rp_read_link_policy {
 	__le16   policy;
 } __attribute__ ((packed));
 
-#define OCF_SWITCH_ROLE	0x000B
+#define OCF_SWITCH_ROLE		0x000B
 struct hci_cp_switch_role {
 	bdaddr_t bdaddr;
 	__u8     role;
@@ -423,6 +447,14 @@ struct hci_rp_write_link_policy {
 	__le16   handle;
 } __attribute__ ((packed));
 
+#define OCF_SNIFF_SUBRATE	0x0011
+struct hci_cp_sniff_subrate {
+	__le16   handle;
+	__le16   max_latency;
+	__le16   min_remote_timeout;
+	__le16   min_local_timeout;
+} __attribute__ ((packed));
+
 /* Status params */
 #define OGF_STATUS_PARAM	0x05
 
@@ -582,15 +614,15 @@ struct hci_ev_link_key_notify {
 	__u8	 key_type;
 } __attribute__ ((packed));
 
-#define HCI_EV_RMT_FEATURES	0x0B
-struct hci_ev_rmt_features {
+#define HCI_EV_REMOTE_FEATURES	0x0B
+struct hci_ev_remote_features {
 	__u8     status;
 	__le16   handle;
 	__u8     features[8];
 } __attribute__ ((packed));
 
-#define HCI_EV_RMT_VERSION	0x0C
-struct hci_ev_rmt_version {
+#define HCI_EV_REMOTE_VERSION	0x0C
+struct hci_ev_remote_version {
 	__u8     status;
 	__le16   handle;
 	__u8     lmp_ver;
@@ -611,6 +643,16 @@ struct hci_ev_pscan_rep_mode {
 	__u8     pscan_rep_mode;
 } __attribute__ ((packed));
 
+#define HCI_EV_SNIFF_SUBRATE	0x2E
+struct hci_ev_sniff_subrate {
+	__u8     status;
+	__le16   handle;
+	__le16   max_tx_latency;
+	__le16   max_rx_latency;
+	__le16   max_remote_timeout;
+	__le16   max_local_timeout;
+} __attribute__ ((packed));
+
 /* Internal events generated by Bluetooth stack */
 #define HCI_EV_STACK_INTERNAL	0xFD
 struct hci_ev_stack_internal {
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index bb9f81dc8723c5..f6852707bd6480 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -31,10 +31,7 @@
 #define HCI_PROTO_L2CAP	0
 #define HCI_PROTO_SCO	1
 
-#define HCI_INIT_TIMEOUT (HZ * 10)
-
 /* HCI Core structures */
-
 struct inquiry_data {
 	bdaddr_t	bdaddr;
 	__u8		pscan_rep_mode;
@@ -81,6 +78,10 @@ struct hci_dev {
 	__u16		link_policy;
 	__u16		link_mode;
 
+	__u32		idle_timeout;
+	__u16		sniff_min_interval;
+	__u16		sniff_max_interval;
+
 	unsigned long	quirks;
 
 	atomic_t	cmd_cnt;
@@ -145,18 +146,24 @@ struct hci_conn {
 	bdaddr_t	 dst;
 	__u16		 handle;
 	__u16		 state;
+	__u8             mode;
 	__u8		 type;
 	__u8		 out;
 	__u8		 dev_class[3];
+	__u8             features[8];
+	__u16            interval;
+	__u16            link_policy;
 	__u32		 link_mode;
+	__u8             power_save;
 	unsigned long	 pend;
-	
+
 	unsigned int	 sent;
-	
+
 	struct sk_buff_head data_q;
 
-	struct timer_list timer;
-	
+	struct timer_list disc_timer;
+	struct timer_list idle_timer;
+
 	struct hci_dev	*hdev;
 	void		*l2cap_data;
 	void		*sco_data;
@@ -211,7 +218,8 @@ void hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data);
 enum {
 	HCI_CONN_AUTH_PEND,
 	HCI_CONN_ENCRYPT_PEND,
-	HCI_CONN_RSWITCH_PEND
+	HCI_CONN_RSWITCH_PEND,
+	HCI_CONN_MODE_CHANGE_PEND,
 };
 
 static inline void hci_conn_hash_init(struct hci_dev *hdev)
@@ -286,31 +294,27 @@ int hci_conn_encrypt(struct hci_conn *conn);
 int hci_conn_change_link_key(struct hci_conn *conn);
 int hci_conn_switch_role(struct hci_conn *conn, uint8_t role);
 
-static inline void hci_conn_set_timer(struct hci_conn *conn, unsigned long timeout)
-{
-	mod_timer(&conn->timer, jiffies + timeout);
-}
-
-static inline void hci_conn_del_timer(struct hci_conn *conn)
-{
-	del_timer(&conn->timer);
-}
+void hci_conn_enter_active_mode(struct hci_conn *conn);
+void hci_conn_enter_sniff_mode(struct hci_conn *conn);
 
 static inline void hci_conn_hold(struct hci_conn *conn)
 {
 	atomic_inc(&conn->refcnt);
-	hci_conn_del_timer(conn);
+	del_timer(&conn->disc_timer);
 }
 
 static inline void hci_conn_put(struct hci_conn *conn)
 {
 	if (atomic_dec_and_test(&conn->refcnt)) {
+		unsigned long timeo;
 		if (conn->type == ACL_LINK) {
-			unsigned long timeo = (conn->out) ?
-				HCI_DISCONN_TIMEOUT : HCI_DISCONN_TIMEOUT * 2;
-			hci_conn_set_timer(conn, timeo);
+			timeo = msecs_to_jiffies(HCI_DISCONN_TIMEOUT);
+			if (!conn->out)
+				timeo *= 2;
+			del_timer(&conn->idle_timer);
 		} else
-			hci_conn_set_timer(conn, HZ / 100);
+			timeo = msecs_to_jiffies(10);
+		mod_timer(&conn->disc_timer, jiffies + timeo);
 	}
 }
 
@@ -411,8 +415,10 @@ void hci_unregister_sysfs(struct hci_dev *hdev);
 #define SET_HCIDEV_DEV(hdev, pdev) ((hdev)->class_dev.dev = (pdev))
 
 /* ----- LMP capabilities ----- */
-#define lmp_rswitch_capable(dev) (dev->features[0] & LMP_RSWITCH)
-#define lmp_encrypt_capable(dev) (dev->features[0] & LMP_ENCRYPT)
+#define lmp_rswitch_capable(dev)   ((dev)->features[0] & LMP_RSWITCH)
+#define lmp_encrypt_capable(dev)   ((dev)->features[0] & LMP_ENCRYPT)
+#define lmp_sniff_capable(dev)     ((dev)->features[0] & LMP_SNIFF)
+#define lmp_sniffsubr_capable(dev) ((dev)->features[5] & LMP_SNIFF_SUBR)
 
 /* ----- HCI protocols ----- */
 struct hci_proto {
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 51f867062e1de6..729461fcfe9933 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -48,7 +48,7 @@
 #define BT_DBG(D...)
 #endif
 
-#define VERSION "2.8"
+#define VERSION "2.9"
 
 /* Bluetooth sockets */
 #define BT_MAX_PROTO	8
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 5c0c2b1ef34a5f..420ed4d7e57e98 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -115,8 +115,8 @@ void hci_add_sco(struct hci_conn *conn, __u16 handle)
 
 static void hci_conn_timeout(unsigned long arg)
 {
-	struct hci_conn *conn = (void *)arg;
-	struct hci_dev  *hdev = conn->hdev;
+	struct hci_conn *conn = (void *) arg;
+	struct hci_dev *hdev = conn->hdev;
 
 	BT_DBG("conn %p state %d", conn, conn->state);
 
@@ -132,11 +132,13 @@ static void hci_conn_timeout(unsigned long arg)
 	return;
 }
 
-static void hci_conn_init_timer(struct hci_conn *conn)
+static void hci_conn_idle(unsigned long arg)
 {
-	init_timer(&conn->timer);
-	conn->timer.function = hci_conn_timeout;
-	conn->timer.data = (unsigned long)conn;
+	struct hci_conn *conn = (void *) arg;
+
+	BT_DBG("conn %p mode %d", conn, conn->mode);
+
+	hci_conn_enter_sniff_mode(conn);
 }
 
 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
@@ -145,17 +147,27 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 
 	BT_DBG("%s dst %s", hdev->name, batostr(dst));
 
-	if (!(conn = kmalloc(sizeof(struct hci_conn), GFP_ATOMIC)))
+	conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
+	if (!conn)
 		return NULL;
-	memset(conn, 0, sizeof(struct hci_conn));
 
 	bacpy(&conn->dst, dst);
-	conn->type   = type;
 	conn->hdev   = hdev;
+	conn->type   = type;
+	conn->mode   = HCI_CM_ACTIVE;
 	conn->state  = BT_OPEN;
 
+	conn->power_save = 1;
+
 	skb_queue_head_init(&conn->data_q);
-	hci_conn_init_timer(conn);
+
+	init_timer(&conn->disc_timer);
+	conn->disc_timer.function = hci_conn_timeout;
+	conn->disc_timer.data = (unsigned long) conn;
+
+	init_timer(&conn->idle_timer);
+	conn->idle_timer.function = hci_conn_idle;
+	conn->idle_timer.data = (unsigned long) conn;
 
 	atomic_set(&conn->refcnt, 0);
 
@@ -178,7 +190,9 @@ int hci_conn_del(struct hci_conn *conn)
 
 	BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
 
-	hci_conn_del_timer(conn);
+	del_timer(&conn->idle_timer);
+
+	del_timer(&conn->disc_timer);
 
 	if (conn->type == SCO_LINK) {
 		struct hci_conn *acl = conn->link;
@@ -364,6 +378,70 @@ int hci_conn_switch_role(struct hci_conn *conn, uint8_t role)
 }
 EXPORT_SYMBOL(hci_conn_switch_role);
 
+/* Enter active mode */
+void hci_conn_enter_active_mode(struct hci_conn *conn)
+{
+	struct hci_dev *hdev = conn->hdev;
+
+	BT_DBG("conn %p mode %d", conn, conn->mode);
+
+	if (test_bit(HCI_RAW, &hdev->flags))
+		return;
+
+	if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
+		goto timer;
+
+	if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
+		struct hci_cp_exit_sniff_mode cp;
+		cp.handle = __cpu_to_le16(conn->handle);
+		hci_send_cmd(hdev, OGF_LINK_POLICY,
+				OCF_EXIT_SNIFF_MODE, sizeof(cp), &cp);
+	}
+
+timer:
+	if (hdev->idle_timeout > 0)
+		mod_timer(&conn->idle_timer,
+			jiffies + msecs_to_jiffies(hdev->idle_timeout));
+}
+
+/* Enter sniff mode */
+void hci_conn_enter_sniff_mode(struct hci_conn *conn)
+{
+	struct hci_dev *hdev = conn->hdev;
+
+	BT_DBG("conn %p mode %d", conn, conn->mode);
+
+	if (test_bit(HCI_RAW, &hdev->flags))
+		return;
+
+	if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
+		return;
+
+	if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
+		return;
+
+	if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
+		struct hci_cp_sniff_subrate cp;
+		cp.handle             = __cpu_to_le16(conn->handle);
+		cp.max_latency        = __constant_cpu_to_le16(0);
+		cp.min_remote_timeout = __constant_cpu_to_le16(0);
+		cp.min_local_timeout  = __constant_cpu_to_le16(0);
+		hci_send_cmd(hdev, OGF_LINK_POLICY,
+				OCF_SNIFF_SUBRATE, sizeof(cp), &cp);
+	}
+
+	if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
+		struct hci_cp_sniff_mode cp;
+		cp.handle       = __cpu_to_le16(conn->handle);
+		cp.max_interval = __cpu_to_le16(hdev->sniff_max_interval);
+		cp.min_interval = __cpu_to_le16(hdev->sniff_min_interval);
+		cp.attempt      = __constant_cpu_to_le16(4);
+		cp.timeout      = __constant_cpu_to_le16(1);
+		hci_send_cmd(hdev, OGF_LINK_POLICY,
+				OCF_SNIFF_MODE, sizeof(cp), &cp);
+	}
+}
+
 /* Drop all connection on the device */
 void hci_conn_hash_flush(struct hci_dev *hdev)
 {
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index f67240beb0ddc6..3f9f1565bf061f 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -411,7 +411,7 @@ int hci_inquiry(void __user *arg)
 	}
 	hci_dev_unlock_bh(hdev);
 
-	timeo = ir.length * 2 * HZ;
+	timeo = ir.length * msecs_to_jiffies(2000);
 	if (do_inquiry && (err = hci_request(hdev, hci_inq_req, (unsigned long)&ir, timeo)) < 0)
 		goto done;
 
@@ -479,7 +479,8 @@ int hci_dev_open(__u16 dev)
 		set_bit(HCI_INIT, &hdev->flags);
 
 		//__hci_request(hdev, hci_reset_req, 0, HZ);
-		ret = __hci_request(hdev, hci_init_req, 0, HCI_INIT_TIMEOUT);
+		ret = __hci_request(hdev, hci_init_req, 0,
+					msecs_to_jiffies(HCI_INIT_TIMEOUT));
 
 		clear_bit(HCI_INIT, &hdev->flags);
 	}
@@ -546,7 +547,8 @@ static int hci_dev_do_close(struct hci_dev *hdev)
 	atomic_set(&hdev->cmd_cnt, 1);
 	if (!test_bit(HCI_RAW, &hdev->flags)) {
 		set_bit(HCI_INIT, &hdev->flags);
-		__hci_request(hdev, hci_reset_req, 0, HZ/4);
+		__hci_request(hdev, hci_reset_req, 0,
+					msecs_to_jiffies(250));
 		clear_bit(HCI_INIT, &hdev->flags);
 	}
 
@@ -619,7 +621,8 @@ int hci_dev_reset(__u16 dev)
 	hdev->acl_cnt = 0; hdev->sco_cnt = 0;
 
 	if (!test_bit(HCI_RAW, &hdev->flags))
-		ret = __hci_request(hdev, hci_reset_req, 0, HCI_INIT_TIMEOUT);
+		ret = __hci_request(hdev, hci_reset_req, 0,
+					msecs_to_jiffies(HCI_INIT_TIMEOUT));
 
 done:
 	tasklet_enable(&hdev->tx_task);
@@ -657,7 +660,8 @@ int hci_dev_cmd(unsigned int cmd, void __user *arg)
 
 	switch (cmd) {
 	case HCISETAUTH:
-		err = hci_request(hdev, hci_auth_req, dr.dev_opt, HCI_INIT_TIMEOUT);
+		err = hci_request(hdev, hci_auth_req, dr.dev_opt,
+					msecs_to_jiffies(HCI_INIT_TIMEOUT));
 		break;
 
 	case HCISETENCRYPT:
@@ -668,18 +672,19 @@ int hci_dev_cmd(unsigned int cmd, void __user *arg)
 
 		if (!test_bit(HCI_AUTH, &hdev->flags)) {
 			/* Auth must be enabled first */
-			err = hci_request(hdev, hci_auth_req,
-					dr.dev_opt, HCI_INIT_TIMEOUT);
+			err = hci_request(hdev, hci_auth_req, dr.dev_opt,
+					msecs_to_jiffies(HCI_INIT_TIMEOUT));
 			if (err)
 				break;
 		}
 
-		err = hci_request(hdev, hci_encrypt_req,
-					dr.dev_opt, HCI_INIT_TIMEOUT);
+		err = hci_request(hdev, hci_encrypt_req, dr.dev_opt,
+					msecs_to_jiffies(HCI_INIT_TIMEOUT));
 		break;
 
 	case HCISETSCAN:
-		err = hci_request(hdev, hci_scan_req, dr.dev_opt, HCI_INIT_TIMEOUT);
+		err = hci_request(hdev, hci_scan_req, dr.dev_opt,
+					msecs_to_jiffies(HCI_INIT_TIMEOUT));
 		break;
 
 	case HCISETPTYPE:
@@ -848,6 +853,10 @@ int hci_register_dev(struct hci_dev *hdev)
 	hdev->pkt_type  = (HCI_DM1 | HCI_DH1 | HCI_HV1);
 	hdev->link_mode = (HCI_LM_ACCEPT);
 
+	hdev->idle_timeout = 0;
+	hdev->sniff_max_interval = 800;
+	hdev->sniff_min_interval = 80;
+
 	tasklet_init(&hdev->cmd_task, hci_cmd_task,(unsigned long) hdev);
 	tasklet_init(&hdev->rx_task, hci_rx_task, (unsigned long) hdev);
 	tasklet_init(&hdev->tx_task, hci_tx_task, (unsigned long) hdev);
@@ -1220,6 +1229,9 @@ static inline void hci_sched_acl(struct hci_dev *hdev)
 	while (hdev->acl_cnt && (conn = hci_low_sent(hdev, ACL_LINK, &quote))) {
 		while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
 			BT_DBG("skb %p len %d", skb, skb->len);
+
+			hci_conn_enter_active_mode(conn);
+
 			hci_send_frame(skb);
 			hdev->acl_last_tx = jiffies;
 
@@ -1298,6 +1310,8 @@ static inline void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb)
 	if (conn) {
 		register struct hci_proto *hp;
 
+		hci_conn_enter_active_mode(conn);
+
 		/* Send to upper protocol */
 		if ((hp = hci_proto[HCI_PROTO_L2CAP]) && hp->recv_acldata) {
 			hp->recv_acldata(conn, skb, flags);
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index f41cf1a6c11aa3..3896dabab11da7 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -83,6 +83,8 @@ static void hci_cc_link_policy(struct hci_dev *hdev, __u16 ocf, struct sk_buff *
 {
 	struct hci_conn *conn;
 	struct hci_rp_role_discovery *rd;
+	struct hci_rp_write_link_policy *lp;
+	void *sent;
 
 	BT_DBG("%s ocf 0x%x", hdev->name, ocf);
 
@@ -106,6 +108,27 @@ static void hci_cc_link_policy(struct hci_dev *hdev, __u16 ocf, struct sk_buff *
 		hci_dev_unlock(hdev);
 		break;
 
+	case OCF_WRITE_LINK_POLICY:
+		sent = hci_sent_cmd_data(hdev, OGF_LINK_POLICY, OCF_WRITE_LINK_POLICY);
+		if (!sent)
+			break;
+
+		lp = (struct hci_rp_write_link_policy *) skb->data;
+
+		if (lp->status)
+			break;
+
+		hci_dev_lock(hdev);
+
+		conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(lp->handle));
+		if (conn) {
+			__le16 policy = get_unaligned((__le16 *) (sent + 2));
+			conn->link_policy = __le16_to_cpu(policy);
+		}
+
+		hci_dev_unlock(hdev);
+		break;
+
 	default:
 		BT_DBG("%s: Command complete: ogf LINK_POLICY ocf %x", 
 				hdev->name, ocf);
@@ -274,7 +297,7 @@ static void hci_cc_host_ctl(struct hci_dev *hdev, __u16 ocf, struct sk_buff *skb
 /* Command Complete OGF INFO_PARAM  */
 static void hci_cc_info_param(struct hci_dev *hdev, __u16 ocf, struct sk_buff *skb)
 {
-	struct hci_rp_read_loc_features *lf;
+	struct hci_rp_read_local_features *lf;
 	struct hci_rp_read_buffer_size *bs;
 	struct hci_rp_read_bd_addr *ba;
 
@@ -282,7 +305,7 @@ static void hci_cc_info_param(struct hci_dev *hdev, __u16 ocf, struct sk_buff *s
 
 	switch (ocf) {
 	case OCF_READ_LOCAL_FEATURES:
-		lf = (struct hci_rp_read_loc_features *) skb->data;
+		lf = (struct hci_rp_read_local_features *) skb->data;
 
 		if (lf->status) {
 			BT_DBG("%s READ_LOCAL_FEATURES failed %d", hdev->name, lf->status);
@@ -447,8 +470,46 @@ static void hci_cs_link_policy(struct hci_dev *hdev, __u16 ocf, __u8 status)
 	BT_DBG("%s ocf 0x%x", hdev->name, ocf);
 
 	switch (ocf) {
+	case OCF_SNIFF_MODE:
+		if (status) {
+			struct hci_conn *conn;
+			struct hci_cp_sniff_mode *cp = hci_sent_cmd_data(hdev, OGF_LINK_POLICY, OCF_SNIFF_MODE);
+
+			if (!cp)
+				break;
+
+			hci_dev_lock(hdev);
+
+			conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(cp->handle));
+			if (conn) {
+				clear_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend);
+			}
+
+			hci_dev_unlock(hdev);
+		}
+		break;
+
+	case OCF_EXIT_SNIFF_MODE:
+		if (status) {
+			struct hci_conn *conn;
+			struct hci_cp_exit_sniff_mode *cp = hci_sent_cmd_data(hdev, OGF_LINK_POLICY, OCF_EXIT_SNIFF_MODE);
+
+			if (!cp)
+				break;
+
+			hci_dev_lock(hdev);
+
+			conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(cp->handle));
+			if (conn) {
+				clear_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend);
+			}
+
+			hci_dev_unlock(hdev);
+		}
+		break;
+
 	default:
-		BT_DBG("%s Command status: ogf HOST_POLICY ocf %x", hdev->name, ocf);
+		BT_DBG("%s Command status: ogf LINK_POLICY ocf %x", hdev->name, ocf);
 		break;
 	}
 }
@@ -630,14 +691,16 @@ static inline void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *sk
 		else
 			cp.role = 0x01; /* Remain slave */
 
-		hci_send_cmd(hdev, OGF_LINK_CTL, OCF_ACCEPT_CONN_REQ, sizeof(cp), &cp);
+		hci_send_cmd(hdev, OGF_LINK_CTL,
+				OCF_ACCEPT_CONN_REQ, sizeof(cp), &cp);
 	} else {
 		/* Connection rejected */
 		struct hci_cp_reject_conn_req cp;
 
 		bacpy(&cp.bdaddr, &ev->bdaddr);
 		cp.reason = 0x0f;
-		hci_send_cmd(hdev, OGF_LINK_CTL, OCF_REJECT_CONN_REQ, sizeof(cp), &cp);
+		hci_send_cmd(hdev, OGF_LINK_CTL,
+				OCF_REJECT_CONN_REQ, sizeof(cp), &cp);
 	}
 }
 
@@ -645,7 +708,7 @@ static inline void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *sk
 static inline void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_ev_conn_complete *ev = (struct hci_ev_conn_complete *) skb->data;
-	struct hci_conn *conn = NULL;
+	struct hci_conn *conn;
 
 	BT_DBG("%s", hdev->name);
 
@@ -667,12 +730,21 @@ static inline void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *s
 		if (test_bit(HCI_ENCRYPT, &hdev->flags))
 			conn->link_mode |= HCI_LM_ENCRYPT;
 
+		/* Get remote features */
+		if (conn->type == ACL_LINK) {
+			struct hci_cp_read_remote_features cp;
+			cp.handle = ev->handle;
+			hci_send_cmd(hdev, OGF_LINK_CTL,
+				OCF_READ_REMOTE_FEATURES, sizeof(cp), &cp);
+		}
+
 		/* Set link policy */
 		if (conn->type == ACL_LINK && hdev->link_policy) {
 			struct hci_cp_write_link_policy cp;
 			cp.handle = ev->handle;
 			cp.policy = __cpu_to_le16(hdev->link_policy);
-			hci_send_cmd(hdev, OGF_LINK_POLICY, OCF_WRITE_LINK_POLICY, sizeof(cp), &cp);
+			hci_send_cmd(hdev, OGF_LINK_POLICY,
+				OCF_WRITE_LINK_POLICY, sizeof(cp), &cp);
 		}
 
 		/* Set packet type for incoming connection */
@@ -683,7 +755,8 @@ static inline void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *s
 				__cpu_to_le16(hdev->pkt_type & ACL_PTYPE_MASK):
 				__cpu_to_le16(hdev->pkt_type & SCO_PTYPE_MASK);
 
-			hci_send_cmd(hdev, OGF_LINK_CTL, OCF_CHANGE_CONN_PTYPE, sizeof(cp), &cp);
+			hci_send_cmd(hdev, OGF_LINK_CTL,
+				OCF_CHANGE_CONN_PTYPE, sizeof(cp), &cp);
 		}
 	} else
 		conn->state = BT_CLOSED;
@@ -711,8 +784,7 @@ static inline void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *s
 static inline void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_ev_disconn_complete *ev = (struct hci_ev_disconn_complete *) skb->data;
-	struct hci_conn *conn = NULL;
-	__u16 handle = __le16_to_cpu(ev->handle);
+	struct hci_conn *conn;
 
 	BT_DBG("%s status %d", hdev->name, ev->status);
 
@@ -721,7 +793,7 @@ static inline void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff
 
 	hci_dev_lock(hdev);
 
-	conn = hci_conn_hash_lookup_handle(hdev, handle);
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
 	if (conn) {
 		conn->state = BT_CLOSED;
 		hci_proto_disconn_ind(conn, ev->reason);
@@ -778,7 +850,7 @@ static inline void hci_num_comp_pkts_evt(struct hci_dev *hdev, struct sk_buff *s
 static inline void hci_role_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_ev_role_change *ev = (struct hci_ev_role_change *) skb->data;
-	struct hci_conn *conn = NULL;
+	struct hci_conn *conn;
 
 	BT_DBG("%s status %d", hdev->name, ev->status);
 
@@ -801,18 +873,43 @@ static inline void hci_role_change_evt(struct hci_dev *hdev, struct sk_buff *skb
 	hci_dev_unlock(hdev);
 }
 
+/* Mode Change */
+static inline void hci_mode_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct hci_ev_mode_change *ev = (struct hci_ev_mode_change *) skb->data;
+	struct hci_conn *conn;
+
+	BT_DBG("%s status %d", hdev->name, ev->status);
+
+	hci_dev_lock(hdev);
+
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
+	if (conn) {
+		conn->mode = ev->mode;
+		conn->interval = __le16_to_cpu(ev->interval);
+
+		if (!test_and_clear_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
+			if (conn->mode == HCI_CM_ACTIVE)
+				conn->power_save = 1;
+			else
+				conn->power_save = 0;
+		}
+	}
+
+	hci_dev_unlock(hdev);
+}
+
 /* Authentication Complete */
 static inline void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_ev_auth_complete *ev = (struct hci_ev_auth_complete *) skb->data;
-	struct hci_conn *conn = NULL;
-	__u16 handle = __le16_to_cpu(ev->handle);
+	struct hci_conn *conn;
 
 	BT_DBG("%s status %d", hdev->name, ev->status);
 
 	hci_dev_lock(hdev);
 
-	conn = hci_conn_hash_lookup_handle(hdev, handle);
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
 	if (conn) {
 		if (!ev->status)
 			conn->link_mode |= HCI_LM_AUTH;
@@ -827,8 +924,7 @@ static inline void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *s
 				cp.handle  = __cpu_to_le16(conn->handle);
 				cp.encrypt = 1;
 				hci_send_cmd(conn->hdev, OGF_LINK_CTL,
-						OCF_SET_CONN_ENCRYPT,
-						sizeof(cp), &cp);
+					OCF_SET_CONN_ENCRYPT, sizeof(cp), &cp);
 			} else {
 				clear_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend);
 				hci_encrypt_cfm(conn, ev->status, 0x00);
@@ -843,14 +939,13 @@ static inline void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *s
 static inline void hci_encrypt_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_ev_encrypt_change *ev = (struct hci_ev_encrypt_change *) skb->data;
-	struct hci_conn *conn = NULL;
-	__u16 handle = __le16_to_cpu(ev->handle);
+	struct hci_conn *conn;
 
 	BT_DBG("%s status %d", hdev->name, ev->status);
 
 	hci_dev_lock(hdev);
 
-	conn = hci_conn_hash_lookup_handle(hdev, handle);
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
 	if (conn) {
 		if (!ev->status) {
 			if (ev->encrypt)
@@ -871,14 +966,13 @@ static inline void hci_encrypt_change_evt(struct hci_dev *hdev, struct sk_buff *
 static inline void hci_change_conn_link_key_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_ev_change_conn_link_key_complete *ev = (struct hci_ev_change_conn_link_key_complete *) skb->data;
-	struct hci_conn *conn = NULL;
-	__u16 handle = __le16_to_cpu(ev->handle);
+	struct hci_conn *conn;
 
 	BT_DBG("%s status %d", hdev->name, ev->status);
 
 	hci_dev_lock(hdev);
 
-	conn = hci_conn_hash_lookup_handle(hdev, handle);
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
 	if (conn) {
 		if (!ev->status)
 			conn->link_mode |= HCI_LM_SECURE;
@@ -906,18 +1000,35 @@ static inline void hci_link_key_notify_evt(struct hci_dev *hdev, struct sk_buff
 {
 }
 
+/* Remote Features */
+static inline void hci_remote_features_evt(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct hci_ev_remote_features *ev = (struct hci_ev_remote_features *) skb->data;
+	struct hci_conn *conn;
+
+	BT_DBG("%s status %d", hdev->name, ev->status);
+
+	hci_dev_lock(hdev);
+
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
+	if (conn && !ev->status) {
+		memcpy(conn->features, ev->features, sizeof(conn->features));
+	}
+
+	hci_dev_unlock(hdev);
+}
+
 /* Clock Offset */
 static inline void hci_clock_offset_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_ev_clock_offset *ev = (struct hci_ev_clock_offset *) skb->data;
-	struct hci_conn *conn = NULL;
-	__u16 handle = __le16_to_cpu(ev->handle);
+	struct hci_conn *conn;
 
 	BT_DBG("%s status %d", hdev->name, ev->status);
 
 	hci_dev_lock(hdev);
 
-	conn = hci_conn_hash_lookup_handle(hdev, handle);
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
 	if (conn && !ev->status) {
 		struct inquiry_entry *ie;
 
@@ -948,6 +1059,23 @@ static inline void hci_pscan_rep_mode_evt(struct hci_dev *hdev, struct sk_buff *
 	hci_dev_unlock(hdev);
 }
 
+/* Sniff Subrate */
+static inline void hci_sniff_subrate_evt(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct hci_ev_sniff_subrate *ev = (struct hci_ev_sniff_subrate *) skb->data;
+	struct hci_conn *conn;
+
+	BT_DBG("%s status %d", hdev->name, ev->status);
+
+	hci_dev_lock(hdev);
+
+	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
+	if (conn) {
+	}
+
+	hci_dev_unlock(hdev);
+}
+
 void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_event_hdr *hdr = (struct hci_event_hdr *) skb->data;
@@ -996,6 +1124,10 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb)
 		hci_role_change_evt(hdev, skb);
 		break;
 
+	case HCI_EV_MODE_CHANGE:
+		hci_mode_change_evt(hdev, skb);
+		break;
+
 	case HCI_EV_AUTH_COMPLETE:
 		hci_auth_complete_evt(hdev, skb);
 		break;
@@ -1020,6 +1152,10 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb)
 		hci_link_key_notify_evt(hdev, skb);
 		break;
 
+	case HCI_EV_REMOTE_FEATURES:
+		hci_remote_features_evt(hdev, skb);
+		break;
+
 	case HCI_EV_CLOCK_OFFSET:
 		hci_clock_offset_evt(hdev, skb);
 		break;
@@ -1028,6 +1164,10 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb)
 		hci_pscan_rep_mode_evt(hdev, skb);
 		break;
 
+	case HCI_EV_SNIFF_SUBRATE:
+		hci_sniff_subrate_evt(hdev, skb);
+		break;
+
 	case HCI_EV_CMD_STATUS:
 		cs = (struct hci_ev_cmd_status *) skb->data;
 		skb_pull(skb, sizeof(cs));
diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 19b234c86f33ac..89918d2f1fdccb 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -61,18 +61,106 @@ static ssize_t show_inquiry_cache(struct class_device *cdev, char *buf)
 	return n;
 }
 
+static ssize_t show_idle_timeout(struct class_device *cdev, char *buf)
+{
+	struct hci_dev *hdev = class_get_devdata(cdev);
+	return sprintf(buf, "%d\n", hdev->idle_timeout);
+}
+
+static ssize_t store_idle_timeout(struct class_device *cdev, const char *buf, size_t count)
+{
+	struct hci_dev *hdev = class_get_devdata(cdev);
+	char *ptr;
+	__u32 val;
+
+	val = simple_strtoul(buf, &ptr, 10);
+	if (ptr == buf)
+		return -EINVAL;
+
+	if (val != 0 && (val < 500 || val > 3600000))
+		return -EINVAL;
+
+	hdev->idle_timeout = val;
+
+	return count;
+}
+
+static ssize_t show_sniff_max_interval(struct class_device *cdev, char *buf)
+{
+	struct hci_dev *hdev = class_get_devdata(cdev);
+	return sprintf(buf, "%d\n", hdev->sniff_max_interval);
+}
+
+static ssize_t store_sniff_max_interval(struct class_device *cdev, const char *buf, size_t count)
+{
+	struct hci_dev *hdev = class_get_devdata(cdev);
+	char *ptr;
+	__u16 val;
+
+	val = simple_strtoul(buf, &ptr, 10);
+	if (ptr == buf)
+		return -EINVAL;
+
+	if (val < 0x0002 || val > 0xFFFE || val % 2)
+		return -EINVAL;
+
+	if (val < hdev->sniff_min_interval)
+		return -EINVAL;
+
+	hdev->sniff_max_interval = val;
+
+	return count;
+}
+
+static ssize_t show_sniff_min_interval(struct class_device *cdev, char *buf)
+{
+	struct hci_dev *hdev = class_get_devdata(cdev);
+	return sprintf(buf, "%d\n", hdev->sniff_min_interval);
+}
+
+static ssize_t store_sniff_min_interval(struct class_device *cdev, const char *buf, size_t count)
+{
+	struct hci_dev *hdev = class_get_devdata(cdev);
+	char *ptr;
+	__u16 val;
+
+	val = simple_strtoul(buf, &ptr, 10);
+	if (ptr == buf)
+		return -EINVAL;
+
+	if (val < 0x0002 || val > 0xFFFE || val % 2)
+		return -EINVAL;
+
+	if (val > hdev->sniff_max_interval)
+		return -EINVAL;
+
+	hdev->sniff_min_interval = val;
+
+	return count;
+}
+
 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 static CLASS_DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 static CLASS_DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 static CLASS_DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL);
 static CLASS_DEVICE_ATTR(inquiry_cache, S_IRUGO, show_inquiry_cache, NULL);
 
+static CLASS_DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
+				show_idle_timeout, store_idle_timeout);
+static CLASS_DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
+				show_sniff_max_interval, store_sniff_max_interval);
+static CLASS_DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
+				show_sniff_min_interval, store_sniff_min_interval);
+
 static struct class_device_attribute *bt_attrs[] = {
 	&class_device_attr_name,
 	&class_device_attr_type,
 	&class_device_attr_address,
 	&class_device_attr_flags,
 	&class_device_attr_inquiry_cache,
+	&class_device_attr_idle_timeout,
+	&class_device_attr_sniff_max_interval,
+	&class_device_attr_sniff_min_interval,
 	NULL
 };