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1275 |
phoenix |
/*
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BlueCore Serial Protocol (BCSP) for Linux Bluetooth stack (BlueZ).
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Copyright 2002 by Fabrizio Gennari <fabrizio.gennari@philips.com>
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Based on
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hci_h4.c by Maxim Krasnyansky <maxk@qualcomm.com>
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ABCSP by Carl Orsborn <cjo@csr.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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/*
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* $Id: hci_bcsp.c,v 1.1.1.1 2004-04-15 02:29:47 phoenix Exp $
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*/
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#define VERSION "0.1"
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ptrace.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/signal.h>
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#include <linux/ioctl.h>
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#include <linux/skbuff.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include "hci_uart.h"
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#include "hci_bcsp.h"
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#ifndef HCI_UART_DEBUG
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#undef BT_DBG
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#define BT_DBG( A... )
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#undef BT_DMP
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#define BT_DMP( A... )
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#endif
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/* ---- BCSP CRC calculation ---- */
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/* Table for calculating CRC for polynomial 0x1021, LSB processed first,
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initial value 0xffff, bits shifted in reverse order. */
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static const u16 crc_table[] = {
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0x0000, 0x1081, 0x2102, 0x3183,
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0x4204, 0x5285, 0x6306, 0x7387,
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0x8408, 0x9489, 0xa50a, 0xb58b,
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0xc60c, 0xd68d, 0xe70e, 0xf78f
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};
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/* Initialise the crc calculator */
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#define BCSP_CRC_INIT(x) x = 0xffff
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/*
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Update crc with next data byte
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Implementation note
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The data byte is treated as two nibbles. The crc is generated
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in reverse, i.e., bits are fed into the register from the top.
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*/
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static void bcsp_crc_update(u16 *crc, u8 d)
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{
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u16 reg = *crc;
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reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f];
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reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f];
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*crc = reg;
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}
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/*
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Get reverse of generated crc
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Implementation note
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The crc generator (bcsp_crc_init() and bcsp_crc_update())
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creates a reversed crc, so it needs to be swapped back before
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being passed on.
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*/
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static u16 bcsp_crc_reverse(u16 crc)
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{
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u16 b, rev;
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for (b = 0, rev = 0; b < 16; b++) {
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rev = rev << 1;
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rev |= (crc & 1);
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crc = crc >> 1;
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}
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return (rev);
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}
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/* ---- BCSP core ---- */
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static void bcsp_slip_msgdelim(struct sk_buff *skb)
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{
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const char pkt_delim = 0xc0;
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memcpy(skb_put(skb, 1), &pkt_delim, 1);
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}
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static void bcsp_slip_one_byte(struct sk_buff *skb, u8 c)
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{
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const char esc_c0[2] = { 0xdb, 0xdc };
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const char esc_db[2] = { 0xdb, 0xdd };
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switch (c) {
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case 0xc0:
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memcpy(skb_put(skb, 2), &esc_c0, 2);
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break;
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case 0xdb:
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memcpy(skb_put(skb, 2), &esc_db, 2);
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break;
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default:
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memcpy(skb_put(skb, 1), &c, 1);
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}
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}
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static int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb)
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{
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struct bcsp_struct *bcsp = hu->priv;
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if (skb->len > 0xFFF) {
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BT_ERR("Packet too long");
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kfree_skb(skb);
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return 0;
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}
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switch (skb->pkt_type) {
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case HCI_ACLDATA_PKT:
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case HCI_COMMAND_PKT:
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skb_queue_tail(&bcsp->rel, skb);
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break;
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case HCI_SCODATA_PKT:
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skb_queue_tail(&bcsp->unrel, skb);
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break;
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default:
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BT_ERR("Unknown packet type");
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kfree_skb(skb);
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break;
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}
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return 0;
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}
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static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data,
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int len, int pkt_type)
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{
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struct sk_buff *nskb;
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u8 hdr[4], chan;
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int rel, i;
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#ifdef CONFIG_BLUEZ_HCIUART_BCSP_TXCRC
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u16 BCSP_CRC_INIT(bcsp_txmsg_crc);
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#endif
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switch (pkt_type) {
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case HCI_ACLDATA_PKT:
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chan = 6; /* BCSP ACL channel */
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rel = 1; /* reliable channel */
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break;
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case HCI_COMMAND_PKT:
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chan = 5; /* BCSP cmd/evt channel */
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rel = 1; /* reliable channel */
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break;
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case HCI_SCODATA_PKT:
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chan = 7; /* BCSP SCO channel */
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rel = 0; /* unreliable channel */
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break;
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case BCSP_LE_PKT:
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chan = 1; /* BCSP LE channel */
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rel = 0; /* unreliable channel */
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break;
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case BCSP_ACK_PKT:
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chan = 0; /* BCSP internal channel */
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rel = 0; /* unreliable channel */
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break;
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default:
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BT_ERR("Unknown packet type");
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return NULL;
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}
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/* Max len of packet: (original len +4(bcsp hdr) +2(crc))*2
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(because bytes 0xc0 and 0xdb are escaped, worst case is
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when the packet is all made of 0xc0 and 0xdb :) )
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+ 2 (0xc0 delimiters at start and end). */
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nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC);
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if (!nskb)
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return NULL;
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nskb->pkt_type = pkt_type;
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bcsp_slip_msgdelim(nskb);
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hdr[0] = bcsp->rxseq_txack << 3;
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bcsp->txack_req = 0;
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BT_DBG("We request packet no %u to card", bcsp->rxseq_txack);
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if (rel) {
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hdr[0] |= 0x80 + bcsp->msgq_txseq;
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BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq);
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bcsp->msgq_txseq = ++(bcsp->msgq_txseq) & 0x07;
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}
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#ifdef CONFIG_BLUEZ_HCIUART_BCSP_TXCRC
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hdr[0] |= 0x40;
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#endif
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hdr[1] = (len << 4) & 0xFF;
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hdr[1] |= chan;
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hdr[2] = len >> 4;
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hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]);
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/* Put BCSP header */
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for (i = 0; i < 4; i++) {
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bcsp_slip_one_byte(nskb, hdr[i]);
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#ifdef CONFIG_BLUEZ_HCIUART_BCSP_TXCRC
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bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]);
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#endif
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| 246 |
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}
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| 247 |
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| 248 |
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/* Put payload */
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| 249 |
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for (i = 0; i < len; i++) {
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bcsp_slip_one_byte(nskb, data[i]);
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#ifdef CONFIG_BLUEZ_HCIUART_BCSP_TXCRC
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bcsp_crc_update(&bcsp_txmsg_crc, data[i]);
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#endif
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}
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| 255 |
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| 256 |
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#ifdef CONFIG_BLUEZ_HCIUART_BCSP_TXCRC
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/* Put CRC */
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bcsp_txmsg_crc = bcsp_crc_reverse(bcsp_txmsg_crc);
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bcsp_slip_one_byte(nskb, (u8) ((bcsp_txmsg_crc >> 8) & 0x00ff));
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bcsp_slip_one_byte(nskb, (u8) (bcsp_txmsg_crc & 0x00ff));
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#endif
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| 262 |
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| 263 |
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bcsp_slip_msgdelim(nskb);
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return nskb;
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| 265 |
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}
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| 266 |
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| 267 |
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/* This is a rewrite of pkt_avail in ABCSP */
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| 268 |
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static struct sk_buff *bcsp_dequeue(struct hci_uart *hu)
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{
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| 270 |
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struct bcsp_struct *bcsp = (struct bcsp_struct *) hu->priv;
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| 271 |
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unsigned long flags;
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| 272 |
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struct sk_buff *skb;
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| 273 |
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|
| 274 |
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/* First of all, check for unreliable messages in the queue,
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| 275 |
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since they have priority */
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| 276 |
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| 277 |
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if ((skb = skb_dequeue(&bcsp->unrel)) != NULL) {
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| 278 |
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struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, skb->pkt_type);
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| 279 |
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if (nskb) {
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| 280 |
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kfree_skb(skb);
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| 281 |
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return nskb;
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| 282 |
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} else {
|
| 283 |
|
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skb_queue_head(&bcsp->unrel, skb);
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| 284 |
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BT_ERR("Could not dequeue pkt because alloc_skb failed");
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| 285 |
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}
|
| 286 |
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}
|
| 287 |
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|
| 288 |
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/* Now, try to send a reliable pkt. We can only send a
|
| 289 |
|
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reliable packet if the number of packets sent but not yet ack'ed
|
| 290 |
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is < than the winsize */
|
| 291 |
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|
| 292 |
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spin_lock_irqsave(&bcsp->unack.lock, flags);
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| 293 |
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| 294 |
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if (bcsp->unack.qlen < BCSP_TXWINSIZE && (skb = skb_dequeue(&bcsp->rel)) != NULL) {
|
| 295 |
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struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, skb->pkt_type);
|
| 296 |
|
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if (nskb) {
|
| 297 |
|
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__skb_queue_tail(&bcsp->unack, skb);
|
| 298 |
|
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mod_timer(&bcsp->tbcsp, jiffies + HZ / 4);
|
| 299 |
|
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spin_unlock_irqrestore(&bcsp->unack.lock, flags);
|
| 300 |
|
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return nskb;
|
| 301 |
|
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} else {
|
| 302 |
|
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skb_queue_head(&bcsp->rel, skb);
|
| 303 |
|
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BT_ERR("Could not dequeue pkt because alloc_skb failed");
|
| 304 |
|
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}
|
| 305 |
|
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}
|
| 306 |
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|
| 307 |
|
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spin_unlock_irqrestore(&bcsp->unack.lock, flags);
|
| 308 |
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|
| 309 |
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|
| 310 |
|
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/* We could not send a reliable packet, either because there are
|
| 311 |
|
|
none or because there are too many unack'ed pkts. Did we receive
|
| 312 |
|
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any packets we have not acknowledged yet ? */
|
| 313 |
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|
|
| 314 |
|
|
if (bcsp->txack_req) {
|
| 315 |
|
|
/* if so, craft an empty ACK pkt and send it on BCSP unreliable
|
| 316 |
|
|
channel 0 */
|
| 317 |
|
|
struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT);
|
| 318 |
|
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return nskb;
|
| 319 |
|
|
}
|
| 320 |
|
|
|
| 321 |
|
|
/* We have nothing to send */
|
| 322 |
|
|
return NULL;
|
| 323 |
|
|
}
|
| 324 |
|
|
|
| 325 |
|
|
static int bcsp_flush(struct hci_uart *hu)
|
| 326 |
|
|
{
|
| 327 |
|
|
BT_DBG("hu %p", hu);
|
| 328 |
|
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return 0;
|
| 329 |
|
|
}
|
| 330 |
|
|
|
| 331 |
|
|
/* Remove ack'ed packets */
|
| 332 |
|
|
static void bcsp_pkt_cull(struct bcsp_struct *bcsp)
|
| 333 |
|
|
{
|
| 334 |
|
|
unsigned long flags;
|
| 335 |
|
|
struct sk_buff *skb;
|
| 336 |
|
|
int i, pkts_to_be_removed;
|
| 337 |
|
|
u8 seqno;
|
| 338 |
|
|
|
| 339 |
|
|
spin_lock_irqsave(&bcsp->unack.lock, flags);
|
| 340 |
|
|
|
| 341 |
|
|
pkts_to_be_removed = bcsp->unack.qlen;
|
| 342 |
|
|
seqno = bcsp->msgq_txseq;
|
| 343 |
|
|
|
| 344 |
|
|
while (pkts_to_be_removed) {
|
| 345 |
|
|
if (bcsp->rxack == seqno)
|
| 346 |
|
|
break;
|
| 347 |
|
|
pkts_to_be_removed--;
|
| 348 |
|
|
seqno = (seqno - 1) & 0x07;
|
| 349 |
|
|
}
|
| 350 |
|
|
|
| 351 |
|
|
if (bcsp->rxack != seqno)
|
| 352 |
|
|
BT_ERR("Peer acked invalid packet");
|
| 353 |
|
|
|
| 354 |
|
|
BT_DBG("Removing %u pkts out of %u, up to seqno %u",
|
| 355 |
|
|
pkts_to_be_removed, bcsp->unack.qlen, (seqno - 1) & 0x07);
|
| 356 |
|
|
|
| 357 |
|
|
for (i = 0, skb = ((struct sk_buff *) &bcsp->unack)->next; i < pkts_to_be_removed
|
| 358 |
|
|
&& skb != (struct sk_buff *) &bcsp->unack; i++) {
|
| 359 |
|
|
struct sk_buff *nskb;
|
| 360 |
|
|
|
| 361 |
|
|
nskb = skb->next;
|
| 362 |
|
|
__skb_unlink(skb, &bcsp->unack);
|
| 363 |
|
|
kfree_skb(skb);
|
| 364 |
|
|
skb = nskb;
|
| 365 |
|
|
}
|
| 366 |
|
|
if (bcsp->unack.qlen == 0)
|
| 367 |
|
|
del_timer(&bcsp->tbcsp);
|
| 368 |
|
|
spin_unlock_irqrestore(&bcsp->unack.lock, flags);
|
| 369 |
|
|
|
| 370 |
|
|
if (i != pkts_to_be_removed)
|
| 371 |
|
|
BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed);
|
| 372 |
|
|
}
|
| 373 |
|
|
|
| 374 |
|
|
/* Handle BCSP link-establishment packets. When we
|
| 375 |
|
|
detect a "sync" packet, symptom that the BT module has reset,
|
| 376 |
|
|
we do nothing :) (yet) */
|
| 377 |
|
|
static void bcsp_handle_le_pkt(struct hci_uart *hu)
|
| 378 |
|
|
{
|
| 379 |
|
|
struct bcsp_struct *bcsp = hu->priv;
|
| 380 |
|
|
u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed };
|
| 381 |
|
|
u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 };
|
| 382 |
|
|
u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed };
|
| 383 |
|
|
|
| 384 |
|
|
/* spot "conf" pkts and reply with a "conf rsp" pkt */
|
| 385 |
|
|
if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 &&
|
| 386 |
|
|
!memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) {
|
| 387 |
|
|
struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC);
|
| 388 |
|
|
|
| 389 |
|
|
BT_DBG("Found a LE conf pkt");
|
| 390 |
|
|
if (!nskb)
|
| 391 |
|
|
return;
|
| 392 |
|
|
memcpy(skb_put(nskb, 4), conf_rsp_pkt, 4);
|
| 393 |
|
|
nskb->pkt_type = BCSP_LE_PKT;
|
| 394 |
|
|
|
| 395 |
|
|
skb_queue_head(&bcsp->unrel, nskb);
|
| 396 |
|
|
hci_uart_tx_wakeup(hu);
|
| 397 |
|
|
}
|
| 398 |
|
|
/* Spot "sync" pkts. If we find one...disaster! */
|
| 399 |
|
|
else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 &&
|
| 400 |
|
|
!memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) {
|
| 401 |
|
|
BT_ERR("Found a LE sync pkt, card has reset");
|
| 402 |
|
|
}
|
| 403 |
|
|
}
|
| 404 |
|
|
|
| 405 |
|
|
static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte)
|
| 406 |
|
|
{
|
| 407 |
|
|
const u8 c0 = 0xc0, db = 0xdb;
|
| 408 |
|
|
|
| 409 |
|
|
switch (bcsp->rx_esc_state) {
|
| 410 |
|
|
case BCSP_ESCSTATE_NOESC:
|
| 411 |
|
|
switch (byte) {
|
| 412 |
|
|
case 0xdb:
|
| 413 |
|
|
bcsp->rx_esc_state = BCSP_ESCSTATE_ESC;
|
| 414 |
|
|
break;
|
| 415 |
|
|
default:
|
| 416 |
|
|
memcpy(skb_put(bcsp->rx_skb, 1), &byte, 1);
|
| 417 |
|
|
if ((bcsp->rx_skb-> data[0] & 0x40) != 0 &&
|
| 418 |
|
|
bcsp->rx_state != BCSP_W4_CRC)
|
| 419 |
|
|
bcsp_crc_update(&bcsp->message_crc, byte);
|
| 420 |
|
|
bcsp->rx_count--;
|
| 421 |
|
|
}
|
| 422 |
|
|
break;
|
| 423 |
|
|
|
| 424 |
|
|
case BCSP_ESCSTATE_ESC:
|
| 425 |
|
|
switch (byte) {
|
| 426 |
|
|
case 0xdc:
|
| 427 |
|
|
memcpy(skb_put(bcsp->rx_skb, 1), &c0, 1);
|
| 428 |
|
|
if ((bcsp->rx_skb-> data[0] & 0x40) != 0 &&
|
| 429 |
|
|
bcsp->rx_state != BCSP_W4_CRC)
|
| 430 |
|
|
bcsp_crc_update(&bcsp-> message_crc, 0xc0);
|
| 431 |
|
|
bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
|
| 432 |
|
|
bcsp->rx_count--;
|
| 433 |
|
|
break;
|
| 434 |
|
|
|
| 435 |
|
|
case 0xdd:
|
| 436 |
|
|
memcpy(skb_put(bcsp->rx_skb, 1), &db, 1);
|
| 437 |
|
|
if ((bcsp->rx_skb-> data[0] & 0x40) != 0 &&
|
| 438 |
|
|
bcsp->rx_state != BCSP_W4_CRC)
|
| 439 |
|
|
bcsp_crc_update(&bcsp-> message_crc, 0xdb);
|
| 440 |
|
|
bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
|
| 441 |
|
|
bcsp->rx_count--;
|
| 442 |
|
|
break;
|
| 443 |
|
|
|
| 444 |
|
|
default:
|
| 445 |
|
|
BT_ERR ("Invalid byte %02x after esc byte", byte);
|
| 446 |
|
|
kfree_skb(bcsp->rx_skb);
|
| 447 |
|
|
bcsp->rx_skb = NULL;
|
| 448 |
|
|
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
|
| 449 |
|
|
bcsp->rx_count = 0;
|
| 450 |
|
|
}
|
| 451 |
|
|
}
|
| 452 |
|
|
}
|
| 453 |
|
|
|
| 454 |
|
|
static inline void bcsp_complete_rx_pkt(struct hci_uart *hu)
|
| 455 |
|
|
{
|
| 456 |
|
|
struct bcsp_struct *bcsp = hu->priv;
|
| 457 |
|
|
int pass_up;
|
| 458 |
|
|
|
| 459 |
|
|
if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */
|
| 460 |
|
|
BT_DBG("Received seqno %u from card", bcsp->rxseq_txack);
|
| 461 |
|
|
bcsp->rxseq_txack++;
|
| 462 |
|
|
bcsp->rxseq_txack %= 0x8;
|
| 463 |
|
|
bcsp->txack_req = 1;
|
| 464 |
|
|
|
| 465 |
|
|
/* If needed, transmit an ack pkt */
|
| 466 |
|
|
hci_uart_tx_wakeup(hu);
|
| 467 |
|
|
}
|
| 468 |
|
|
|
| 469 |
|
|
bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07;
|
| 470 |
|
|
BT_DBG("Request for pkt %u from card", bcsp->rxack);
|
| 471 |
|
|
|
| 472 |
|
|
bcsp_pkt_cull(bcsp);
|
| 473 |
|
|
if ((bcsp->rx_skb->data[1] & 0x0f) == 6 &&
|
| 474 |
|
|
bcsp->rx_skb->data[0] & 0x80) {
|
| 475 |
|
|
bcsp->rx_skb->pkt_type = HCI_ACLDATA_PKT;
|
| 476 |
|
|
pass_up = 1;
|
| 477 |
|
|
} else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 &&
|
| 478 |
|
|
bcsp->rx_skb->data[0] & 0x80) {
|
| 479 |
|
|
bcsp->rx_skb->pkt_type = HCI_EVENT_PKT;
|
| 480 |
|
|
pass_up = 1;
|
| 481 |
|
|
} else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) {
|
| 482 |
|
|
bcsp->rx_skb->pkt_type = HCI_SCODATA_PKT;
|
| 483 |
|
|
pass_up = 1;
|
| 484 |
|
|
} else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 &&
|
| 485 |
|
|
!(bcsp->rx_skb->data[0] & 0x80)) {
|
| 486 |
|
|
bcsp_handle_le_pkt(hu);
|
| 487 |
|
|
pass_up = 0;
|
| 488 |
|
|
} else
|
| 489 |
|
|
pass_up = 0;
|
| 490 |
|
|
|
| 491 |
|
|
if (!pass_up) {
|
| 492 |
|
|
if ((bcsp->rx_skb->data[1] & 0x0f) != 0 &&
|
| 493 |
|
|
(bcsp->rx_skb->data[1] & 0x0f) != 1) {
|
| 494 |
|
|
BT_ERR ("Packet for unknown channel (%u %s)",
|
| 495 |
|
|
bcsp->rx_skb->data[1] & 0x0f,
|
| 496 |
|
|
bcsp->rx_skb->data[0] & 0x80 ?
|
| 497 |
|
|
"reliable" : "unreliable");
|
| 498 |
|
|
}
|
| 499 |
|
|
kfree_skb(bcsp->rx_skb);
|
| 500 |
|
|
} else {
|
| 501 |
|
|
/* Pull out BCSP hdr */
|
| 502 |
|
|
skb_pull(bcsp->rx_skb, 4);
|
| 503 |
|
|
|
| 504 |
|
|
hci_recv_frame(bcsp->rx_skb);
|
| 505 |
|
|
}
|
| 506 |
|
|
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
|
| 507 |
|
|
bcsp->rx_skb = NULL;
|
| 508 |
|
|
}
|
| 509 |
|
|
|
| 510 |
|
|
/* Recv data */
|
| 511 |
|
|
static int bcsp_recv(struct hci_uart *hu, void *data, int count)
|
| 512 |
|
|
{
|
| 513 |
|
|
struct bcsp_struct *bcsp = hu->priv;
|
| 514 |
|
|
register unsigned char *ptr;
|
| 515 |
|
|
|
| 516 |
|
|
BT_DBG("hu %p count %d rx_state %ld rx_count %ld",
|
| 517 |
|
|
hu, count, bcsp->rx_state, bcsp->rx_count);
|
| 518 |
|
|
|
| 519 |
|
|
ptr = data;
|
| 520 |
|
|
while (count) {
|
| 521 |
|
|
if (bcsp->rx_count) {
|
| 522 |
|
|
if (*ptr == 0xc0) {
|
| 523 |
|
|
BT_ERR("Short BCSP packet");
|
| 524 |
|
|
kfree_skb(bcsp->rx_skb);
|
| 525 |
|
|
bcsp->rx_state = BCSP_W4_PKT_START;
|
| 526 |
|
|
bcsp->rx_count = 0;
|
| 527 |
|
|
} else
|
| 528 |
|
|
bcsp_unslip_one_byte(bcsp, *ptr);
|
| 529 |
|
|
|
| 530 |
|
|
ptr++; count--;
|
| 531 |
|
|
continue;
|
| 532 |
|
|
}
|
| 533 |
|
|
|
| 534 |
|
|
switch (bcsp->rx_state) {
|
| 535 |
|
|
case BCSP_W4_BCSP_HDR:
|
| 536 |
|
|
if ((0xff & (u8) ~ (bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] +
|
| 537 |
|
|
bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) {
|
| 538 |
|
|
BT_ERR("Error in BCSP hdr checksum");
|
| 539 |
|
|
kfree_skb(bcsp->rx_skb);
|
| 540 |
|
|
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
|
| 541 |
|
|
bcsp->rx_count = 0;
|
| 542 |
|
|
continue;
|
| 543 |
|
|
}
|
| 544 |
|
|
if (bcsp->rx_skb->data[0] & 0x80 /* reliable pkt */
|
| 545 |
|
|
&& (bcsp->rx_skb->data[0] & 0x07) != bcsp->rxseq_txack) {
|
| 546 |
|
|
BT_ERR ("Out-of-order packet arrived, got %u expected %u",
|
| 547 |
|
|
bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack);
|
| 548 |
|
|
|
| 549 |
|
|
kfree_skb(bcsp->rx_skb);
|
| 550 |
|
|
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
|
| 551 |
|
|
bcsp->rx_count = 0;
|
| 552 |
|
|
continue;
|
| 553 |
|
|
}
|
| 554 |
|
|
bcsp->rx_state = BCSP_W4_DATA;
|
| 555 |
|
|
bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) +
|
| 556 |
|
|
(bcsp->rx_skb->data[2] << 4); /* May be 0 */
|
| 557 |
|
|
continue;
|
| 558 |
|
|
|
| 559 |
|
|
case BCSP_W4_DATA:
|
| 560 |
|
|
if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */
|
| 561 |
|
|
bcsp->rx_state = BCSP_W4_CRC;
|
| 562 |
|
|
bcsp->rx_count = 2;
|
| 563 |
|
|
} else
|
| 564 |
|
|
bcsp_complete_rx_pkt(hu);
|
| 565 |
|
|
continue;
|
| 566 |
|
|
|
| 567 |
|
|
case BCSP_W4_CRC:
|
| 568 |
|
|
if (bcsp_crc_reverse(bcsp->message_crc) !=
|
| 569 |
|
|
(bcsp->rx_skb->data[bcsp->rx_skb->len - 2] << 8) +
|
| 570 |
|
|
bcsp->rx_skb->data[bcsp->rx_skb->len - 1]) {
|
| 571 |
|
|
|
| 572 |
|
|
BT_ERR ("Checksum failed: computed %04x received %04x",
|
| 573 |
|
|
bcsp_crc_reverse(bcsp->message_crc),
|
| 574 |
|
|
(bcsp->rx_skb-> data[bcsp->rx_skb->len - 2] << 8) +
|
| 575 |
|
|
bcsp->rx_skb->data[bcsp->rx_skb->len - 1]);
|
| 576 |
|
|
|
| 577 |
|
|
kfree_skb(bcsp->rx_skb);
|
| 578 |
|
|
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
|
| 579 |
|
|
bcsp->rx_count = 0;
|
| 580 |
|
|
continue;
|
| 581 |
|
|
}
|
| 582 |
|
|
skb_trim(bcsp->rx_skb, bcsp->rx_skb->len - 2);
|
| 583 |
|
|
bcsp_complete_rx_pkt(hu);
|
| 584 |
|
|
continue;
|
| 585 |
|
|
|
| 586 |
|
|
case BCSP_W4_PKT_DELIMITER:
|
| 587 |
|
|
switch (*ptr) {
|
| 588 |
|
|
case 0xc0:
|
| 589 |
|
|
bcsp->rx_state = BCSP_W4_PKT_START;
|
| 590 |
|
|
break;
|
| 591 |
|
|
default:
|
| 592 |
|
|
/*BT_ERR("Ignoring byte %02x", *ptr);*/
|
| 593 |
|
|
break;
|
| 594 |
|
|
}
|
| 595 |
|
|
ptr++; count--;
|
| 596 |
|
|
break;
|
| 597 |
|
|
|
| 598 |
|
|
case BCSP_W4_PKT_START:
|
| 599 |
|
|
switch (*ptr) {
|
| 600 |
|
|
case 0xc0:
|
| 601 |
|
|
ptr++; count--;
|
| 602 |
|
|
break;
|
| 603 |
|
|
|
| 604 |
|
|
default:
|
| 605 |
|
|
bcsp->rx_state = BCSP_W4_BCSP_HDR;
|
| 606 |
|
|
bcsp->rx_count = 4;
|
| 607 |
|
|
bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
|
| 608 |
|
|
BCSP_CRC_INIT(bcsp->message_crc);
|
| 609 |
|
|
|
| 610 |
|
|
/* Do not increment ptr or decrement count
|
| 611 |
|
|
* Allocate packet. Max len of a BCSP pkt=
|
| 612 |
|
|
* 0xFFF (payload) +4 (header) +2 (crc) */
|
| 613 |
|
|
|
| 614 |
|
|
bcsp->rx_skb = bluez_skb_alloc(0x1005, GFP_ATOMIC);
|
| 615 |
|
|
if (!bcsp->rx_skb) {
|
| 616 |
|
|
BT_ERR("Can't allocate mem for new packet");
|
| 617 |
|
|
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
|
| 618 |
|
|
bcsp->rx_count = 0;
|
| 619 |
|
|
return 0;
|
| 620 |
|
|
}
|
| 621 |
|
|
bcsp->rx_skb->dev = (void *) &hu->hdev;
|
| 622 |
|
|
break;
|
| 623 |
|
|
}
|
| 624 |
|
|
break;
|
| 625 |
|
|
}
|
| 626 |
|
|
}
|
| 627 |
|
|
return count;
|
| 628 |
|
|
}
|
| 629 |
|
|
|
| 630 |
|
|
/* Arrange to retransmit all messages in the relq. */
|
| 631 |
|
|
static void bcsp_timed_event(unsigned long arg)
|
| 632 |
|
|
{
|
| 633 |
|
|
struct hci_uart *hu = (struct hci_uart *) arg;
|
| 634 |
|
|
struct bcsp_struct *bcsp = (struct bcsp_struct *) hu->priv;
|
| 635 |
|
|
struct sk_buff *skb;
|
| 636 |
|
|
unsigned long flags;
|
| 637 |
|
|
|
| 638 |
|
|
BT_ERR("Timeout, retransmitting %u pkts", bcsp->unack.qlen);
|
| 639 |
|
|
spin_lock_irqsave(&bcsp->unack.lock, flags);
|
| 640 |
|
|
|
| 641 |
|
|
while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) {
|
| 642 |
|
|
bcsp->msgq_txseq = (bcsp->msgq_txseq - 1) & 0x07;
|
| 643 |
|
|
skb_queue_head(&bcsp->rel, skb);
|
| 644 |
|
|
}
|
| 645 |
|
|
|
| 646 |
|
|
spin_unlock_irqrestore(&bcsp->unack.lock, flags);
|
| 647 |
|
|
|
| 648 |
|
|
hci_uart_tx_wakeup(hu);
|
| 649 |
|
|
}
|
| 650 |
|
|
|
| 651 |
|
|
static int bcsp_open(struct hci_uart *hu)
|
| 652 |
|
|
{
|
| 653 |
|
|
struct bcsp_struct *bcsp;
|
| 654 |
|
|
|
| 655 |
|
|
BT_DBG("hu %p", hu);
|
| 656 |
|
|
|
| 657 |
|
|
bcsp = kmalloc(sizeof(*bcsp), GFP_ATOMIC);
|
| 658 |
|
|
if (!bcsp)
|
| 659 |
|
|
return -ENOMEM;
|
| 660 |
|
|
memset(bcsp, 0, sizeof(*bcsp));
|
| 661 |
|
|
|
| 662 |
|
|
hu->priv = bcsp;
|
| 663 |
|
|
skb_queue_head_init(&bcsp->unack);
|
| 664 |
|
|
skb_queue_head_init(&bcsp->rel);
|
| 665 |
|
|
skb_queue_head_init(&bcsp->unrel);
|
| 666 |
|
|
|
| 667 |
|
|
init_timer(&bcsp->tbcsp);
|
| 668 |
|
|
bcsp->tbcsp.function = bcsp_timed_event;
|
| 669 |
|
|
bcsp->tbcsp.data = (u_long) hu;
|
| 670 |
|
|
|
| 671 |
|
|
bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
|
| 672 |
|
|
|
| 673 |
|
|
return 0;
|
| 674 |
|
|
}
|
| 675 |
|
|
|
| 676 |
|
|
static int bcsp_close(struct hci_uart *hu)
|
| 677 |
|
|
{
|
| 678 |
|
|
struct bcsp_struct *bcsp = hu->priv;
|
| 679 |
|
|
hu->priv = NULL;
|
| 680 |
|
|
|
| 681 |
|
|
BT_DBG("hu %p", hu);
|
| 682 |
|
|
|
| 683 |
|
|
skb_queue_purge(&bcsp->unack);
|
| 684 |
|
|
skb_queue_purge(&bcsp->rel);
|
| 685 |
|
|
skb_queue_purge(&bcsp->unrel);
|
| 686 |
|
|
del_timer(&bcsp->tbcsp);
|
| 687 |
|
|
|
| 688 |
|
|
kfree(bcsp);
|
| 689 |
|
|
return 0;
|
| 690 |
|
|
}
|
| 691 |
|
|
|
| 692 |
|
|
static struct hci_uart_proto bcsp = {
|
| 693 |
|
|
id: HCI_UART_BCSP,
|
| 694 |
|
|
open: bcsp_open,
|
| 695 |
|
|
close: bcsp_close,
|
| 696 |
|
|
enqueue: bcsp_enqueue,
|
| 697 |
|
|
dequeue: bcsp_dequeue,
|
| 698 |
|
|
recv: bcsp_recv,
|
| 699 |
|
|
flush: bcsp_flush
|
| 700 |
|
|
};
|
| 701 |
|
|
|
| 702 |
|
|
int bcsp_init(void)
|
| 703 |
|
|
{
|
| 704 |
|
|
return hci_uart_register_proto(&bcsp);
|
| 705 |
|
|
}
|
| 706 |
|
|
|
| 707 |
|
|
int bcsp_deinit(void)
|
| 708 |
|
|
{
|
| 709 |
|
|
return hci_uart_unregister_proto(&bcsp);
|
| 710 |
|
|
}
|
