diff options
| author | Johan Hedberg <johan.hedberg@intel.com> | 2013-04-18 16:38:58 +0300 |
|---|---|---|
| committer | Johan Hedberg <johan.hedberg@intel.com> | 2013-04-24 13:00:38 +0300 |
| commit | 0b9e4ab186e7c2cc694090447c755e22b657ae58 (patch) | |
| tree | 294e5a6eb4b689f441fbad58a77a83f4b5699381 | |
| parent | 69676b1c2af451bfe5cd36ff4973a484b5d5a86c (diff) | |
| download | bluetooth-next-0b9e4ab186e7c2cc694090447c755e22b657ae58.tar.gz | |
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>
| -rw-r--r-- | include/net/bluetooth/hci.h | 2 | ||||
| -rw-r--r-- | net/bluetooth/hci_core.c | 15 |
2 files changed, 16 insertions, 1 deletions
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index e0512aaef4b85d..a488f1b991df3f 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -831,6 +831,8 @@ 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 33843c5c49398f..de7e997366d0fc 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -620,6 +620,15 @@ 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; @@ -639,7 +648,11 @@ 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) |