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");