[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>

1 files changed, 166 insertions, 26 deletions

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index f41cf1a..3896dab 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));