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path: root/drivers/bluetooth/hci_bcsp.c
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Diffstat (limited to 'drivers/bluetooth/hci_bcsp.c')
-rw-r--r--drivers/bluetooth/hci_bcsp.c160
1 files changed, 100 insertions, 60 deletions
diff --git a/drivers/bluetooth/hci_bcsp.c b/drivers/bluetooth/hci_bcsp.c
index 0ee324e1265d..0a4761415ac3 100644
--- a/drivers/bluetooth/hci_bcsp.c
+++ b/drivers/bluetooth/hci_bcsp.c
@@ -1,35 +1,27 @@
-/*
- BlueCore Serial Protocol (BCSP) for Linux Bluetooth stack (BlueZ).
- Copyright 2002 by Fabrizio Gennari <fabrizio.gennari@philips.com>
-
- Based on
- hci_h4.c by Maxim Krasnyansky <maxk@qualcomm.com>
- ABCSP by Carl Orsborn <cjo@csr.com>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License version 2 as
- published by the Free Software Foundation;
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
- IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
- CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
- ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
- COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
- SOFTWARE IS DISCLAIMED.
-*/
-
/*
- * $Id: hci_bcsp.c,v 1.2 2002/09/26 05:05:14 maxk Exp $
+ *
+ * Bluetooth HCI UART driver
+ *
+ * Copyright (C) 2002-2003 Fabrizio Gennari <fabrizio.gennari@philips.com>
+ * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
*/
-#define VERSION "0.2"
-
#include <linux/config.h>
#include <linux/module.h>
@@ -52,16 +44,56 @@
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
+
#include "hci_uart.h"
-#include "hci_bcsp.h"
#ifndef CONFIG_BT_HCIUART_DEBUG
#undef BT_DBG
#define BT_DBG( A... )
#endif
+#define VERSION "0.3"
+
+static int txcrc = 1;
static int hciextn = 1;
+#define BCSP_TXWINSIZE 4
+
+#define BCSP_ACK_PKT 0x05
+#define BCSP_LE_PKT 0x06
+
+struct bcsp_struct {
+ struct sk_buff_head unack; /* Unack'ed packets queue */
+ struct sk_buff_head rel; /* Reliable packets queue */
+ struct sk_buff_head unrel; /* Unreliable packets queue */
+
+ unsigned long rx_count;
+ struct sk_buff *rx_skb;
+ u8 rxseq_txack; /* rxseq == txack. */
+ u8 rxack; /* Last packet sent by us that the peer ack'ed */
+ struct timer_list tbcsp;
+
+ enum {
+ BCSP_W4_PKT_DELIMITER,
+ BCSP_W4_PKT_START,
+ BCSP_W4_BCSP_HDR,
+ BCSP_W4_DATA,
+ BCSP_W4_CRC
+ } rx_state;
+
+ enum {
+ BCSP_ESCSTATE_NOESC,
+ BCSP_ESCSTATE_ESC
+ } rx_esc_state;
+
+ u8 use_crc;
+ u16 message_crc;
+ u8 txack_req; /* Do we need to send ack's to the peer? */
+
+ /* Reliable packet sequence number - used to assign seq to each rel pkt. */
+ u8 msgq_txseq;
+};
+
/* ---- BCSP CRC calculation ---- */
/* Table for calculating CRC for polynomial 0x1021, LSB processed first,
@@ -111,6 +143,7 @@ static u16 bcsp_crc_reverse(u16 crc)
rev |= (crc & 1);
crc = crc >> 1;
}
+
return (rev);
}
@@ -119,6 +152,7 @@ static u16 bcsp_crc_reverse(u16 crc)
static void bcsp_slip_msgdelim(struct sk_buff *skb)
{
const char pkt_delim = 0xc0;
+
memcpy(skb_put(skb, 1), &pkt_delim, 1);
}
@@ -173,11 +207,8 @@ static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data,
{
struct sk_buff *nskb;
u8 hdr[4], chan;
- int rel, i;
-
-#ifdef CONFIG_BT_HCIUART_BCSP_TXCRC
u16 BCSP_CRC_INIT(bcsp_txmsg_crc);
-#endif
+ int rel, i;
switch (pkt_type) {
case HCI_ACLDATA_PKT:
@@ -240,9 +271,9 @@ static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data,
BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq);
bcsp->msgq_txseq = ++(bcsp->msgq_txseq) & 0x07;
}
-#ifdef CONFIG_BT_HCIUART_BCSP_TXCRC
- hdr[0] |= 0x40;
-#endif
+
+ if (bcsp->use_crc)
+ hdr[0] |= 0x40;
hdr[1] = ((len << 4) & 0xff) | chan;
hdr[2] = len >> 4;
@@ -251,25 +282,25 @@ static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data,
/* Put BCSP header */
for (i = 0; i < 4; i++) {
bcsp_slip_one_byte(nskb, hdr[i]);
-#ifdef CONFIG_BT_HCIUART_BCSP_TXCRC
- bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]);
-#endif
+
+ if (bcsp->use_crc)
+ bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]);
}
/* Put payload */
for (i = 0; i < len; i++) {
bcsp_slip_one_byte(nskb, data[i]);
-#ifdef CONFIG_BT_HCIUART_BCSP_TXCRC
- bcsp_crc_update(&bcsp_txmsg_crc, data[i]);
-#endif
+
+ if (bcsp->use_crc)
+ bcsp_crc_update(&bcsp_txmsg_crc, data[i]);
}
-#ifdef CONFIG_BT_HCIUART_BCSP_TXCRC
/* Put CRC */
- bcsp_txmsg_crc = bcsp_crc_reverse(bcsp_txmsg_crc);
- bcsp_slip_one_byte(nskb, (u8) ((bcsp_txmsg_crc >> 8) & 0x00ff));
- bcsp_slip_one_byte(nskb, (u8) (bcsp_txmsg_crc & 0x00ff));
-#endif
+ if (bcsp->use_crc) {
+ bcsp_txmsg_crc = bcsp_crc_reverse(bcsp_txmsg_crc);
+ bcsp_slip_one_byte(nskb, (u8) ((bcsp_txmsg_crc >> 8) & 0x00ff));
+ bcsp_slip_one_byte(nskb, (u8) (bcsp_txmsg_crc & 0x00ff));
+ }
bcsp_slip_msgdelim(nskb);
return nskb;
@@ -317,7 +348,6 @@ static struct sk_buff *bcsp_dequeue(struct hci_uart *hu)
spin_unlock_irqrestore(&bcsp->unack.lock, flags);
-
/* We could not send a reliable packet, either because there are
none or because there are too many unack'ed pkts. Did we receive
any packets we have not acknowledged yet ? */
@@ -363,7 +393,7 @@ static void bcsp_pkt_cull(struct bcsp_struct *bcsp)
BT_ERR("Peer acked invalid packet");
BT_DBG("Removing %u pkts out of %u, up to seqno %u",
- pkts_to_be_removed, bcsp->unack.qlen, (seqno - 1) & 0x07);
+ pkts_to_be_removed, bcsp->unack.qlen, (seqno - 1) & 0x07);
for (i = 0, skb = ((struct sk_buff *) &bcsp->unack)->next; i < pkts_to_be_removed
&& skb != (struct sk_buff *) &bcsp->unack; i++) {
@@ -374,8 +404,10 @@ static void bcsp_pkt_cull(struct bcsp_struct *bcsp)
kfree_skb(skb);
skb = nskb;
}
+
if (bcsp->unack.qlen == 0)
del_timer(&bcsp->tbcsp);
+
spin_unlock_irqrestore(&bcsp->unack.lock, flags);
if (i != pkts_to_be_removed)
@@ -530,6 +562,7 @@ static inline void bcsp_complete_rx_pkt(struct hci_uart *hu)
hci_recv_frame(bcsp->rx_skb);
}
+
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
bcsp->rx_skb = NULL;
}
@@ -598,8 +631,8 @@ static int bcsp_recv(struct hci_uart *hu, void *data, int count)
BT_ERR ("Checksum failed: computed %04x received %04x",
bcsp_crc_reverse(bcsp->message_crc),
- (bcsp->rx_skb-> data[bcsp->rx_skb->len - 2] << 8) +
- bcsp->rx_skb->data[bcsp->rx_skb->len - 1]);
+ (bcsp->rx_skb-> data[bcsp->rx_skb->len - 2] << 8) +
+ bcsp->rx_skb->data[bcsp->rx_skb->len - 1]);
kfree_skb(bcsp->rx_skb);
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
@@ -633,7 +666,7 @@ static int bcsp_recv(struct hci_uart *hu, void *data, int count)
bcsp->rx_count = 4;
bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
BCSP_CRC_INIT(bcsp->message_crc);
-
+
/* Do not increment ptr or decrement count
* Allocate packet. Max len of a BCSP pkt=
* 0xFFF (payload) +4 (header) +2 (crc) */
@@ -698,6 +731,9 @@ static int bcsp_open(struct hci_uart *hu)
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
+ if (txcrc)
+ bcsp->use_crc = 1;
+
return 0;
}
@@ -718,18 +754,19 @@ static int bcsp_close(struct hci_uart *hu)
}
static struct hci_uart_proto bcsp = {
- .id = HCI_UART_BCSP,
- .open = bcsp_open,
- .close = bcsp_close,
- .enqueue = bcsp_enqueue,
- .dequeue = bcsp_dequeue,
- .recv = bcsp_recv,
- .flush = bcsp_flush
+ .id = HCI_UART_BCSP,
+ .open = bcsp_open,
+ .close = bcsp_close,
+ .enqueue = bcsp_enqueue,
+ .dequeue = bcsp_dequeue,
+ .recv = bcsp_recv,
+ .flush = bcsp_flush
};
int bcsp_init(void)
{
int err = hci_uart_register_proto(&bcsp);
+
if (!err)
BT_INFO("HCI BCSP protocol initialized");
else
@@ -743,5 +780,8 @@ int bcsp_deinit(void)
return hci_uart_unregister_proto(&bcsp);
}
+module_param(txcrc, bool, 0644);
+MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet");
+
module_param(hciextn, bool, 0644);
MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.