From da25cf6a9869cff52b4fd189fdcd322ad2daf023 Mon Sep 17 00:00:00 2001 From: Marcel Holtmann Date: Fri, 5 Dec 2014 13:03:35 +0100 Subject: Bluetooth: Report invalid RSSI for service discovery and background scan When using Start Service Discovery and when background scanning is used to report devices, the RSSI is reported or the value 127 is provided in case RSSI in unavailable. For Start Discovery the value 0 is reported to keep backwards compatibility with the existing users. Signed-off-by: Marcel Holtmann Signed-off-by: Johan Hedberg --- include/net/bluetooth/hci_core.h | 3 +++ net/bluetooth/mgmt.c | 12 ++++++++++-- 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index f07b145..3c78270 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -75,6 +75,7 @@ struct discovery_state { u32 last_adv_flags; u8 last_adv_data[HCI_MAX_AD_LENGTH]; u8 last_adv_data_len; + bool report_invalid_rssi; s8 rssi; u16 uuid_count; u8 (*uuids)[16]; @@ -506,11 +507,13 @@ static inline void discovery_init(struct hci_dev *hdev) INIT_LIST_HEAD(&hdev->discovery.all); INIT_LIST_HEAD(&hdev->discovery.unknown); INIT_LIST_HEAD(&hdev->discovery.resolve); + hdev->discovery.report_invalid_rssi = true; hdev->discovery.rssi = HCI_RSSI_INVALID; } static inline void hci_discovery_filter_clear(struct hci_dev *hdev) { + hdev->discovery.report_invalid_rssi = true; hdev->discovery.rssi = HCI_RSSI_INVALID; hdev->discovery.uuid_count = 0; kfree(hdev->discovery.uuids); diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 3ca2818..a91e484 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -3912,6 +3912,7 @@ static int start_discovery(struct sock *sk, struct hci_dev *hdev, hci_discovery_filter_clear(hdev); hdev->discovery.type = cp->type; + hdev->discovery.report_invalid_rssi = false; hci_req_init(&req, hdev); @@ -7022,8 +7023,15 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type, memset(buf, 0, sizeof(buf)); - /* Reset invalid RSSI to 0 to keep backwards API compliance */ - if (rssi == HCI_RSSI_INVALID) + /* In case of device discovery with BR/EDR devices (pre 1.2), the + * RSSI value was reported as 0 when not available. This behavior + * is kept when using device discovery. This is required for full + * backwards compatibility with the API. + * + * However when using service discovery, the value 127 will be + * returned when the RSSI is not available. + */ + if (rssi == HCI_RSSI_INVALID && !hdev->discovery.report_invalid_rssi) rssi = 0; bacpy(&ev->addr.bdaddr, bdaddr); -- cgit v1.1