[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>
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 5c0c2b1..420ed4d 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -115,8 +115,8 @@
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 @@
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 @@
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 @@
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 @@
}
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)
{