From f674a057c1f6b0fedf7d989c6dac0b482fef1b55 Mon Sep 17 00:00:00 2001 From: Johan Hedberg Date: Mon, 16 Jul 2012 16:12:15 +0300 Subject: [PATCH] Bluetooth: Add initialization tracking to HCI Three-wire driver This patch adds tracking for the uninitialized, initialized and active states for Three-wire UART. This is needed so we can handle periodic sending of the Link Establishment messages before reaching active state and so that we do not try to do any higher level HCI data transmission before reaching active state. Signed-off-by: Johan Hedberg Signed-off-by: Gustavo Padovan --- drivers/bluetooth/hci_h5.c | 66 +++++++++++++++++++++++++++++--------- 1 file changed, 50 insertions(+), 16 deletions(-) diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c index d9d42f65ee6e..6fb8d4eca0fb 100644 --- a/drivers/bluetooth/hci_h5.c +++ b/drivers/bluetooth/hci_h5.c @@ -75,18 +75,53 @@ struct h5 { u8 tx_seq; /* Next seq number to send */ u8 tx_ack; /* Next ack number to send */ + enum { + H5_UNINITIALIZED, + H5_INITIALIZED, + H5_ACTIVE, + } state; + bool sleeping; }; static void h5_reset_rx(struct h5 *h5); +static void h5_link_control(struct hci_uart *hu, const void *data, size_t len) +{ + struct h5 *h5 = hu->priv; + struct sk_buff *nskb; + + nskb = alloc_skb(3, GFP_ATOMIC); + if (!nskb) + return; + + bt_cb(nskb)->pkt_type = HCI_3WIRE_LINK_PKT; + + memcpy(skb_put(nskb, len), data, len); + + skb_queue_tail(&h5->unrel, nskb); +} + static void h5_timed_event(unsigned long arg) { + const unsigned char sync_req[] = { 0x01, 0x7e }; + const unsigned char conf_req[] = { 0x03, 0xfc, 0x01 }; struct hci_uart *hu = (struct hci_uart *) arg; struct h5 *h5 = hu->priv; struct sk_buff *skb; unsigned long flags; + if (h5->state == H5_UNINITIALIZED) + h5_link_control(hu, sync_req, sizeof(sync_req)); + + if (h5->state == H5_INITIALIZED) + h5_link_control(hu, conf_req, sizeof(conf_req)); + + if (h5->state != H5_ACTIVE) { + mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT); + goto wakeup; + } + BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen); spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING); @@ -98,25 +133,10 @@ static void h5_timed_event(unsigned long arg) spin_unlock_irqrestore(&h5->unack.lock, flags); +wakeup: hci_uart_tx_wakeup(hu); } -static void h5_link_control(struct hci_uart *hu, const void *data, size_t len) -{ - struct h5 *h5 = hu->priv; - struct sk_buff *nskb; - - nskb = alloc_skb(3, GFP_ATOMIC); - if (!nskb) - return; - - bt_cb(nskb)->pkt_type = HCI_3WIRE_LINK_PKT; - - memcpy(skb_put(nskb, len), data, len); - - skb_queue_tail(&h5->unrel, nskb); -} - static int h5_open(struct hci_uart *hu) { struct h5 *h5; @@ -230,12 +250,14 @@ static void h5_handle_internal_rx(struct hci_uart *hu) if (memcmp(data, sync_req, 2) == 0) { h5_link_control(hu, sync_rsp, 2); } else if (memcmp(data, sync_rsp, 2) == 0) { + h5->state = H5_INITIALIZED; h5_link_control(hu, conf_req, 3); } else if (memcmp(data, conf_req, 2) == 0) { h5_link_control(hu, conf_rsp, 2); h5_link_control(hu, conf_req, 3); } else if (memcmp(data, conf_rsp, 2) == 0) { BT_DBG("Three-wire init sequence complete"); + h5->state = H5_ACTIVE; hci_uart_init_ready(hu); return; } else if (memcmp(data, sleep_req, 2) == 0) { @@ -340,6 +362,12 @@ static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c) return 0; } + if (h5->state != H5_ACTIVE && + H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) { + BT_ERR("Non-link packet received in non-active state"); + h5_reset_rx(h5); + } + h5->rx_func = h5_rx_payload; h5->rx_pending = H5_HDR_LEN(hdr); @@ -468,6 +496,12 @@ static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb) return 0; } + if (h5->state != H5_ACTIVE) { + BT_ERR("Ignoring HCI data in non-active state"); + kfree_skb(skb); + return 0; + } + switch (bt_cb(skb)->pkt_type) { case HCI_ACLDATA_PKT: case HCI_COMMAND_PKT: -- 2.20.1