Return-Path: From: Tomas Winkler To: marcel@holtmann.org, linux-bluetooth@vger.kernel.org Cc: guy.cohen@intel.com, ron.rindjunsky@intel.com, Gregory Paskar Subject: [bluetooth-next 1/1] bluetooth: handle device reset event Date: Thu, 18 Feb 2010 11:40:07 +0200 Message-Id: <1266486007-25015-1-git-send-email-tomas.winkler@intel.com> Content-Type: text/plain; charset="us-ascii" List-ID: From: Gregory Paskar A bluetooth device experiencing hardware failure may issue a HARDWARE_ERROR hci event. The reaction to this event is device reset flow implemented in following sequence. 1. Notify: HCI_DEV_DOWN 2. Reinitialize internal structures. 3. Call driver flush function 4. Send HCI reset request to the device. 5. Send HCI init sequence reset to the device. 6. Notify HCI_DEV_UP. Signed-off-by: Gregory Paskar Signed-off-by: Tomas Winkler Reviewed-by: Ron Rindjunsky --- include/net/bluetooth/hci.h | 5 ++++ include/net/bluetooth/hci_core.h | 2 + net/bluetooth/hci_core.c | 40 +++++++++++++++++++++++++++++++++++++- net/bluetooth/hci_event.c | 3 ++ 4 files changed, 49 insertions(+), 1 deletions(-) diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index ed3aea1..cd23eb4 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -691,6 +691,11 @@ struct hci_ev_cmd_status { __le16 opcode; } __attribute__ ((packed)); +#define HCI_EV_HARDWARE_ERROR 0x10 +struct hci_ev_hw_error { + __u8 hw_code; +} __attribute__ ((packed)); + #define HCI_EV_ROLE_CHANGE 0x12 struct hci_ev_role_change { __u8 status; diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 7b86094..d2b1cba 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -110,6 +110,8 @@ struct hci_dev { struct tasklet_struct rx_task; struct tasklet_struct tx_task; + struct work_struct hw_err_work; + struct sk_buff_head rx_q; struct sk_buff_head raw_q; struct sk_buff_head cmd_q; diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 94ba349..6002439 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -834,6 +834,44 @@ static int hci_rfkill_set_block(void *data, bool blocked) return 0; } +static void hci_device_hw_error(struct hci_dev *hdev) +{ + hci_req_lock(hdev); + clear_bit(HCI_UP, &hdev->flags); + hci_notify(hdev, HCI_DEV_DOWN); + tasklet_disable(&hdev->tx_task); + skb_queue_purge(&hdev->rx_q); + skb_queue_purge(&hdev->cmd_q); + hci_dev_lock_bh(hdev); + inquiry_cache_flush(hdev); + hci_conn_hash_flush(hdev); + hci_dev_unlock_bh(hdev); + if (hdev->flush) + hdev->flush(hdev); + atomic_set(&hdev->cmd_cnt, 1); + hdev->acl_cnt = 0; + hdev->sco_cnt = 0; + hci_reset_req(hdev, 0); + atomic_set(&hdev->cmd_cnt, 1); + hci_init_req(hdev, 0); + tasklet_enable(&hdev->tx_task); + set_bit(HCI_UP, &hdev->flags); + hci_notify(hdev, HCI_DEV_UP); + hci_req_unlock(hdev); +} + + +static void hci_hw_err_work(struct work_struct *ws) +{ + struct hci_dev *hdev; + hdev = container_of(ws, struct hci_dev, hw_err_work); + if (!hdev) { + BT_DBG("%s: hci_hw_error_worker: hdev = NULL ", hdev->name); + return; + } + hci_device_hw_error(hdev); +} + static const struct rfkill_ops hci_rfkill_ops = { .set_block = hci_rfkill_set_block, }; @@ -903,7 +941,7 @@ int hci_register_dev(struct hci_dev *hdev) tasklet_init(&hdev->cmd_task, hci_cmd_task,(unsigned long) hdev); tasklet_init(&hdev->rx_task, hci_rx_task, (unsigned long) hdev); tasklet_init(&hdev->tx_task, hci_tx_task, (unsigned long) hdev); - + INIT_WORK(&hdev->hw_err_work, hci_hw_err_work); skb_queue_head_init(&hdev->rx_q); skb_queue_head_init(&hdev->cmd_q); skb_queue_head_init(&hdev->raw_q); diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 28517ba..e8f48cc 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -1953,6 +1953,9 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb) case HCI_EV_REMOTE_HOST_FEATURES: hci_remote_host_features_evt(hdev, skb); break; + case HCI_EV_HARDWARE_ERROR: + schedule_work(&hdev->hw_err_work); + break; default: BT_DBG("%s event 0x%x", hdev->name, event); -- 1.6.0.6 --------------------------------------------------------------------- Intel Israel (74) Limited This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.