[Bluetooth] Add basics to better support and handle eSCO links

To better support and handle eSCO links in the future a bunch of
constants needs to be added and some basic routines need to be
updated. This is the initial step.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

5 files changed, 66 insertions, 37 deletions

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 93ce272a5d27..ebfb96b41106 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -107,14 +107,14 @@ enum {
 #define HCI_IDLE_TIMEOUT        (6000)  /* 6 seconds */
 #define HCI_INIT_TIMEOUT        (10000) /* 10 seconds */
 
-/* HCI Packet types */
+/* HCI data types */
 #define HCI_COMMAND_PKT         0x01
 #define HCI_ACLDATA_PKT         0x02
 #define HCI_SCODATA_PKT         0x03
 #define HCI_EVENT_PKT           0x04
 #define HCI_VENDOR_PKT          0xff
 
-/* HCI Packet types */
+/* HCI packet types */
 #define HCI_DM1         0x0008
 #define HCI_DM3         0x0400
 #define HCI_DM5         0x4000
@@ -129,6 +129,14 @@ enum {
 #define SCO_PTYPE_MASK  (HCI_HV1 | HCI_HV2 | HCI_HV3)
 #define ACL_PTYPE_MASK  (~SCO_PTYPE_MASK)
 
+/* eSCO packet types */
+#define ESCO_HV1        0x0001
+#define ESCO_HV2        0x0002
+#define ESCO_HV3        0x0004
+#define ESCO_EV3        0x0008
+#define ESCO_EV4        0x0010
+#define ESCO_EV5        0x0020
+
 /* ACL flags */
 #define ACL_CONT                0x01
 #define ACL_START               0x02
@@ -138,6 +146,7 @@ enum {
 /* Baseband links */
 #define SCO_LINK        0x00
 #define ACL_LINK        0x01
+#define ESCO_LINK       0x02
 
 /* LMP features */
 #define LMP_3SLOT       0x01
@@ -162,6 +171,11 @@ enum {
 #define LMP_PSCHEME     0x02
 #define LMP_PCONTROL    0x04
 
+#define LMP_ESCO        0x80
+
+#define LMP_EV4         0x01
+#define LMP_EV5         0x02
+
 #define LMP_SNIFF_SUBR  0x02
 
 /* Connection modes */
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 7c78744ec0fd..8f67c8a7169b 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -78,6 +78,7 @@ struct hci_dev {
         __u16           voice_setting;
 
         __u16           pkt_type;
+        __u16           esco_type;
         __u16           link_policy;
         __u16           link_mode;
 
@@ -452,6 +453,7 @@ void hci_conn_del_sysfs(struct hci_conn *conn);
 #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)
+#define lmp_esco_capable(dev)      ((dev)->features[3] & LMP_ESCO)
 
 /* ----- HCI protocols ----- */
 struct hci_proto {
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 63980bd6b5f2..5fdfc9a67d39 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -123,8 +123,8 @@ void hci_add_sco(struct hci_conn *conn, __u16 handle)
         conn->state = BT_CONNECT;
         conn->out = 1;
 
-        cp.pkt_type = cpu_to_le16(hdev->pkt_type & SCO_PTYPE_MASK);
         cp.handle   = cpu_to_le16(handle);
+        cp.pkt_type = cpu_to_le16(hdev->pkt_type & SCO_PTYPE_MASK);
 
         hci_send_cmd(hdev, OGF_LINK_CTL, OCF_ADD_SCO, sizeof(cp), &cp);
 }
@@ -220,19 +220,19 @@ int hci_conn_del(struct hci_conn *conn)
 
         del_timer(&conn->disc_timer);
 
-        if (conn->type == SCO_LINK) {
-                struct hci_conn *acl = conn->link;
-                if (acl) {
-                        acl->link = NULL;
-                        hci_conn_put(acl);
-                }
-        } else {
+        if (conn->type == ACL_LINK) {
                 struct hci_conn *sco = conn->link;
                 if (sco)
                         sco->link = NULL;
 
                 /* Unacked frames */
                 hdev->acl_cnt += conn->sent;
+        } else {
+                struct hci_conn *acl = conn->link;
+                if (acl) {
+                        acl->link = NULL;
+                        hci_conn_put(acl);
+                }
         }
 
         tasklet_disable(&hdev->tx_task);
@@ -297,9 +297,10 @@ EXPORT_SYMBOL(hci_get_route);
 
 /* Create SCO or ACL connection.
  * Device _must_ be locked */
-struct hci_conn * hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst)
+struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst)
 {
         struct hci_conn *acl;
+        struct hci_conn *sco;
 
         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 
@@ -313,28 +314,26 @@ struct hci_conn * hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst)
         if (acl->state == BT_OPEN || acl->state == BT_CLOSED)
                 hci_acl_connect(acl);
 
-        if (type == SCO_LINK) {
-                struct hci_conn *sco;
+        if (type == ACL_LINK)
+                return acl;
 
-                if (!(sco = hci_conn_hash_lookup_ba(hdev, SCO_LINK, dst))) {
-                        if (!(sco = hci_conn_add(hdev, SCO_LINK, dst))) {
-                                hci_conn_put(acl);
-                                return NULL;
-                        }
+        if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst))) {
+                if (!(sco = hci_conn_add(hdev, type, dst))) {
+                        hci_conn_put(acl);
+                        return NULL;
                 }
-                acl->link = sco;
-                sco->link = acl;
+        }
 
-                hci_conn_hold(sco);
+        acl->link = sco;
+        sco->link = acl;
 
-                if (acl->state == BT_CONNECTED &&
-                                (sco->state == BT_OPEN || sco->state == BT_CLOSED))
-                        hci_add_sco(sco, acl->handle);
+        hci_conn_hold(sco);
 
-                return sco;
-        } else {
+        if (acl->state == BT_CONNECTED &&
+                        (sco->state == BT_OPEN || sco->state == BT_CLOSED))