Bluetooth: Add support for Three-wire Link Control packets
This patch adds basic support for parsing and sending Three-wire UART Link Control packets. Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
This commit is contained in:
Johan Hedberg
Gustavo Padovan
parent
43eb12d789
commit
40f10224df
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@ -36,6 +36,7 @@
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#define H5_TXWINSIZE 4
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#define H5_ACK_TIMEOUT msecs_to_jiffies(250)
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#define H5_SYNC_TIMEOUT msecs_to_jiffies(100)
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/*
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* Maximum Three-wire packet:
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@ -65,7 +66,6 @@ struct h5 {
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size_t rx_pending; /* Expecting more bytes */
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bool rx_esc; /* SLIP escape mode */
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u8 rx_ack; /* Last ack number received */
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u8 rx_seq; /* Last seq number received */
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int (*rx_func) (struct hci_uart *hu, u8 c);
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@ -73,6 +73,7 @@ struct h5 {
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bool tx_ack_req; /* Pending ack to send */
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u8 tx_seq; /* Next seq number to send */
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u8 tx_ack; /* Next ack number to send */
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};
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static void h5_reset_rx(struct h5 *h5);
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@ -98,9 +99,26 @@ static void h5_timed_event(unsigned long arg)
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hci_uart_tx_wakeup(hu);
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}
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static void h5_link_control(struct hci_uart *hu, const void *data, size_t len)
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{
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struct h5 *h5 = hu->priv;
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struct sk_buff *nskb;
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nskb = alloc_skb(3, GFP_ATOMIC);
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if (!nskb)
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return;
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bt_cb(nskb)->pkt_type = HCI_3WIRE_LINK_PKT;
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memcpy(skb_put(nskb, len), data, len);
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skb_queue_tail(&h5->unrel, nskb);
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}
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static int h5_open(struct hci_uart *hu)
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{
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struct h5 *h5;
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const unsigned char sync[] = { 0x01, 0x7e };
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BT_DBG("hu %p", hu);
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@ -120,6 +138,10 @@ static int h5_open(struct hci_uart *hu)
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h5->timer.function = h5_timed_event;
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h5->timer.data = (unsigned long) hu;
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/* Send initial sync request */
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h5_link_control(hu, sync, sizeof(sync));
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mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT);
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return 0;
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}
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@ -148,6 +170,8 @@ static void h5_pkt_cull(struct h5 *h5)
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spin_lock_irqsave(&h5->unack.lock, flags);
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to_remove = skb_queue_len(&h5->unack);
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if (to_remove == 0)
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goto unlock;
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seq = h5->tx_seq;
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@ -174,12 +198,44 @@ static void h5_pkt_cull(struct h5 *h5)
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if (skb_queue_empty(&h5->unack))
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del_timer(&h5->timer);
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unlock:
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spin_unlock_irqrestore(&h5->unack.lock, flags);
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}
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static void h5_handle_internal_rx(struct hci_uart *hu)
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{
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struct h5 *h5 = hu->priv;
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const unsigned char sync_req[] = { 0x01, 0x7e };
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const unsigned char sync_rsp[] = { 0x02, 0x7d };
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const unsigned char conf_req[] = { 0x03, 0xfc, 0x01 };
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const unsigned char conf_rsp[] = { 0x04, 0x7b, 0x01 };
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const unsigned char *hdr = h5->rx_skb->data;
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const unsigned char *data = &h5->rx_skb->data[4];
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BT_DBG("%s", hu->hdev->name);
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if (H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT)
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return;
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if (H5_HDR_LEN(hdr) < 2)
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return;
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if (memcmp(data, sync_req, 2) == 0) {
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h5_link_control(hu, sync_rsp, 2);
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} else if (memcmp(data, sync_rsp, 2) == 0) {
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h5_link_control(hu, conf_req, 3);
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} else if (memcmp(data, conf_req, 2) == 0) {
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h5_link_control(hu, conf_rsp, 2);
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h5_link_control(hu, conf_req, 3);
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} else if (memcmp(data, conf_rsp, 2) == 0) {
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BT_DBG("Three-wire init sequence complete");
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return;
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} else {
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BT_DBG("Link Control: 0x%02hhx 0x%02hhx", data[0], data[1]);
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return;
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}
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hci_uart_tx_wakeup(hu);
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}
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static void h5_complete_rx_pkt(struct hci_uart *hu)
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@ -190,8 +246,9 @@ static void h5_complete_rx_pkt(struct hci_uart *hu)
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BT_DBG("%s", hu->hdev->name);
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if (H5_HDR_RELIABLE(hdr)) {
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h5->tx_seq = (h5->tx_seq + 1) % 8;
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h5->tx_ack = (h5->tx_ack + 1) % 8;
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h5->tx_ack_req = true;
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hci_uart_tx_wakeup(hu);
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}
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h5->rx_ack = H5_HDR_ACK(hdr);
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@ -257,15 +314,20 @@ static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c)
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BT_DBG("%s 0x%02hhx", hu->hdev->name, c);
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BT_DBG("%s rx: seq %u ack %u crc %u rel %u type %u len %u",
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hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),
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H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),
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H5_HDR_LEN(hdr));
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if (((hdr[0] + hdr[1] + hdr[2] + hdr[3]) & 0xff) != 0xff) {
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BT_ERR("Invalid header checksum");
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h5_reset_rx(h5);
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return 0;
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}
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if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_seq) {
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if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_ack) {
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BT_ERR("Out-of-order packet arrived (%u != %u)",
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H5_HDR_SEQ(hdr), h5->tx_seq);
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H5_HDR_SEQ(hdr), h5->tx_ack);
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h5_reset_rx(h5);
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return 0;
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}
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@ -444,9 +506,10 @@ static void h5_slip_one_byte(struct sk_buff *skb, u8 c)
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}
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}
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static struct sk_buff *h5_build_pkt(struct h5 *h5, bool rel, u8 pkt_type,
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static struct sk_buff *h5_build_pkt(struct hci_uart *hu, bool rel, u8 pkt_type,
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const u8 *data, size_t len)
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{
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struct h5 *h5 = hu->priv;
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struct sk_buff *nskb;
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u8 hdr[4];
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int i;
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@ -465,7 +528,7 @@ static struct sk_buff *h5_build_pkt(struct h5 *h5, bool rel, u8 pkt_type,
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h5_slip_delim(nskb);
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hdr[0] = h5->rx_seq << 3;
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hdr[0] = h5->tx_ack << 3;
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h5->tx_ack_req = false;
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if (rel) {
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@ -478,6 +541,11 @@ static struct sk_buff *h5_build_pkt(struct h5 *h5, bool rel, u8 pkt_type,
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hdr[2] = len >> 4;
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hdr[3] = ~((hdr[0] + hdr[1] + hdr[2]) & 0xff);
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BT_DBG("%s tx: seq %u ack %u crc %u rel %u type %u len %u",
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hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),
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H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),
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H5_HDR_LEN(hdr));
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for (i = 0; i < 4; i++)
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h5_slip_one_byte(nskb, hdr[i]);
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@ -489,7 +557,7 @@ static struct sk_buff *h5_build_pkt(struct h5 *h5, bool rel, u8 pkt_type,
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return nskb;
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}
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static struct sk_buff *h5_prepare_pkt(struct h5 *h5, u8 pkt_type,
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static struct sk_buff *h5_prepare_pkt(struct hci_uart *hu, u8 pkt_type,
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const u8 *data, size_t len)
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{
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bool rel;
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@ -509,13 +577,7 @@ static struct sk_buff *h5_prepare_pkt(struct h5 *h5, u8 pkt_type,
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return NULL;
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}
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return h5_build_pkt(h5, rel, pkt_type, data, len);
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}
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static struct sk_buff *h5_prepare_ack(struct h5 *h5)
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{
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h5->tx_ack_req = false;
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return NULL;
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return h5_build_pkt(hu, rel, pkt_type, data, len);
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}
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static struct sk_buff *h5_dequeue(struct hci_uart *hu)
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@ -525,7 +587,7 @@ static struct sk_buff *h5_dequeue(struct hci_uart *hu)
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struct sk_buff *skb, *nskb;
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if ((skb = skb_dequeue(&h5->unrel)) != NULL) {
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nskb = h5_prepare_pkt(h5, bt_cb(skb)->pkt_type,
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nskb = h5_prepare_pkt(hu, bt_cb(skb)->pkt_type,
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skb->data, skb->len);
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if (nskb) {
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kfree_skb(skb);
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@ -542,7 +604,7 @@ static struct sk_buff *h5_dequeue(struct hci_uart *hu)
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goto unlock;
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if ((skb = skb_dequeue(&h5->rel)) != NULL) {
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nskb = h5_prepare_pkt(h5, bt_cb(skb)->pkt_type,
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nskb = h5_prepare_pkt(hu, bt_cb(skb)->pkt_type,
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skb->data, skb->len);
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if (nskb) {
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__skb_queue_tail(&h5->unack, skb);
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@ -559,7 +621,7 @@ unlock:
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spin_unlock_irqrestore(&h5->unack.lock, flags);
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if (h5->tx_ack_req)
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return h5_prepare_ack(h5);
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return h5_prepare_pkt(hu, HCI_3WIRE_ACK_PKT, NULL, 0);
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return NULL;
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}
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