Bluetooth: Add synchronization train parameters reading support

This patch adds support for reading the synchronization train parameters
for controllers that support the feature. Since the feature is
detectable through the local features page 2, which is retreived only in
stage 3 of the HCI init sequence, there is no other option than to add a
fourth stage to the init sequence.

For now the patch doesn't yet add storing of the parameters, but it is
nevertheless convenient to have around to see what kind of parameters
various controllers use by default (analyzable e.g. with the btmon user
space tool).

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

2 files changed, 16 insertions, 1 deletions

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 52bd2488ff4a..f7197a0ac759 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -835,6 +835,8 @@ struct hci_cp_write_le_host_supported {
         __u8    simul;
 } __packed;
 
+#define HCI_OP_READ_SYNC_TRAIN_PARAMS   0x0c77
+
 #define HCI_OP_READ_LOCAL_VERSION       0x1001
 struct hci_rp_read_local_version {
         __u8     status;
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index b24d2fa02c2f..ea542e07b2e9 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -648,6 +648,15 @@ static void hci_init3_req(struct hci_request *req, unsigned long opt)
         }
 }
 
+static void hci_init4_req(struct hci_request *req, unsigned long opt)
+{
+        struct hci_dev *hdev = req->hdev;
+
+        /* Check for Synchronization Train support */
+        if (hdev->features[2][0] & 0x04)
+                hci_req_add(req, HCI_OP_READ_SYNC_TRAIN_PARAMS, 0, NULL);
+}
+
 static int __hci_init(struct hci_dev *hdev)
 {
         int err;
@@ -667,7 +676,11 @@ static int __hci_init(struct hci_dev *hdev)
         if (err < 0)
                 return err;
 
-        return __hci_req_sync(hdev, hci_init3_req, 0, HCI_INIT_TIMEOUT);
+        err = __hci_req_sync(hdev, hci_init3_req, 0, HCI_INIT_TIMEOUT);
+        if (err < 0)
+                return err;
+
+        return __hci_req_sync(hdev, hci_init4_req, 0, HCI_INIT_TIMEOUT);
 }
 
 static void hci_scan_req(struct hci_request *req, unsigned long opt)