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authorJohan Hedberg <johan.hedberg@intel.com>2012-07-16 17:12:04 +0400
committerGustavo Padovan <gustavo.padovan@collabora.co.uk>2012-07-17 21:48:13 +0400
commit3f27e95b83d08a58aadef42f332b1d1d50101cb6 (patch)
tree26d8e20839164bb75497a0caf761725f4f3583c3 /drivers/bluetooth/hci_h5.c
parent7d664fbafaf992e501159c013b4264a03ee1efac (diff)
downloadlinux-3f27e95b83d08a58aadef42f332b1d1d50101cb6.tar.xz
Bluetooth: Add initial reliable packet support for Three-wire UART
This patch adds initial support for reliable packets along with the necessary retransmission timer for the Three-wire UART HCI driver. Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Diffstat (limited to 'drivers/bluetooth/hci_h5.c')
-rw-r--r--drivers/bluetooth/hci_h5.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 6b7ec643f3da..ae1bd32d8ef9 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -30,6 +30,10 @@
#include "hci_uart.h"
+#define H5_TXWINSIZE 4
+
+#define H5_ACK_TIMEOUT msecs_to_jiffies(250)
+
struct h5 {
struct sk_buff_head unack; /* Unack'ed packets queue */
struct sk_buff_head rel; /* Reliable packets queue */
@@ -37,11 +41,34 @@ struct h5 {
struct sk_buff *rx_skb;
+ struct timer_list timer; /* Retransmission timer */
+
bool txack_req;
u8 msgq_txseq;
};
+static void h5_timed_event(unsigned long arg)
+{
+ struct hci_uart *hu = (struct hci_uart *) arg;
+ struct h5 *h5 = hu->priv;
+ struct sk_buff *skb;
+ unsigned long flags;
+
+ BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen);
+
+ spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
+
+ while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {
+ h5->msgq_txseq = (h5->msgq_txseq - 1) & 0x07;
+ skb_queue_head(&h5->rel, skb);
+ }
+
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+
+ hci_uart_tx_wakeup(hu);
+}
+
static int h5_open(struct hci_uart *hu)
{
struct h5 *h5;
@@ -58,6 +85,10 @@ static int h5_open(struct hci_uart *hu)
skb_queue_head_init(&h5->rel);
skb_queue_head_init(&h5->unrel);
+ init_timer(&h5->timer);
+ h5->timer.function = h5_timed_event;
+ h5->timer.data = (unsigned long) hu;
+
return 0;
}
@@ -69,6 +100,8 @@ static int h5_close(struct hci_uart *hu)
skb_queue_purge(&h5->rel);
skb_queue_purge(&h5->unrel);
+ del_timer(&h5->timer);
+
kfree(h5);
return 0;
@@ -123,6 +156,7 @@ static struct sk_buff *h5_prepare_ack(struct h5 *h5)
static struct sk_buff *h5_dequeue(struct hci_uart *hu)
{
struct h5 *h5 = hu->priv;
+ unsigned long flags;
struct sk_buff *skb, *nskb;
if ((skb = skb_dequeue(&h5->unrel)) != NULL) {
@@ -136,6 +170,28 @@ static struct sk_buff *h5_dequeue(struct hci_uart *hu)
BT_ERR("Could not dequeue pkt because alloc_skb failed");
}
+ spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
+
+ if (h5->unack.qlen >= H5_TXWINSIZE)
+ goto unlock;
+
+ if ((skb = skb_dequeue(&h5->rel)) != NULL) {
+ nskb = h5_prepare_pkt(h5, skb);
+
+ if (nskb) {
+ __skb_queue_tail(&h5->unack, skb);
+ mod_timer(&h5->timer, jiffies + H5_ACK_TIMEOUT);
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+ return nskb;
+ }
+
+ skb_queue_head(&h5->rel, skb);
+ BT_ERR("Could not dequeue pkt because alloc_skb failed");
+ }
+
+unlock:
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+
if (h5->txack_req)
return h5_prepare_ack(h5);