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SubjectH5 Line Discipline for Bluetooth
From ab30529d2c1d32dd397e4e5c165572a2ab43f597 Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Wed, 10 Aug 2011 14:26:34 -0700
Subject: [PATCH 01/10] adding H5

---
drivers/bluetooth/1 | 812 ++++++++++++++++++++++++++++++++++++++++
drivers/bluetooth/Kconfig | 11 +
drivers/bluetooth/Makefile | 1 +
drivers/bluetooth/hci_h5.c | 817 +++++++++++++++++++++++++++++++++++++++++
drivers/bluetooth/hci_ldisc.c | 32 +-
drivers/bluetooth/hci_uart.h | 8 +-
6 files changed, 1669 insertions(+), 12 deletions(-)
create mode 100644 drivers/bluetooth/1
create mode 100644 drivers/bluetooth/hci_h5.c
diff --git a/drivers/bluetooth/1 b/drivers/bluetooth/1
new file mode 100644
index 0000000..0d6eb8a
--- /dev/null
+++ b/drivers/bluetooth/1
@@ -0,0 +1,812 @@
+/*
+ *
+ * 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
+ *
+ */
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/poll.h>
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/ioctl.h>
+#include <linux/skbuff.h>
+#include <linux/bitrev.h>
+#include <asm/unaligned.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "hci_uart.h"
+
+#define VERSION "0.3"
+#undef BT_DBG
+#define BT_DBG printk
+
+static int h5txcrc = 1;
+static int h5extn = 1;
+
+#define H5_TXWINSIZE 4
+
+#define H5_ACK_PKT 0x05
+#define H5_LE_PKT 0x06
+
+struct h5_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 th5;
+
+ enum {
+ H5_W4_PKT_DELIMITER,
+ H5_W4_PKT_START,
+ H5_W4_H5_HDR,
+ H5_W4_DATA,
+ H5_W4_CRC
+ } rx_state;
+
+ enum {
+ H5_ESCSTATE_NOESC,
+ H5_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;
+};
+
+/* ---- H5 CRC calculation ---- */
+
+/* Table for calculating CRC for polynomial 0x1021, LSB processed first,
+initial value 0xffff, bits shifted in reverse order. */
+
+static const u16 crc_table[] = {
+ 0x0000, 0x1081, 0x2102, 0x3183,
+ 0x4204, 0x5285, 0x6306, 0x7387,
+ 0x8408, 0x9489, 0xa50a, 0xb58b,
+ 0xc60c, 0xd68d, 0xe70e, 0xf78f
+};
+
+/* Initialise the crc calculator */
+#define H5_CRC_INIT(x) x = 0xffff
+
+/*
+ Update crc with next data byte
+
+ Implementation note
+ The data byte is treated as two nibbles. The crc is generated
+ in reverse, i.e., bits are fed into the register from the top.
+*/
+static void h5_crc_update(u16 *crc, u8 d)
+{
+ u16 reg = *crc;
+
+ printk("%s\n", __func__);
+
+ reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f];
+ reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f];
+
+ *crc = reg;
+}
+
+/* ---- H5 core ---- */
+
+static void h5_slip_msgdelim(struct sk_buff *skb)
+{
+ const char pkt_delim = 0xc0;
+
+ printk("%s\n", __func__);
+
+ memcpy(skb_put(skb, 1), &pkt_delim, 1);
+}
+
+static void h5_slip_one_byte(struct sk_buff *skb, u8 c)
+{
+ const char esc_c0[2] = { 0xdb, 0xdc };
+ const char esc_db[2] = { 0xdb, 0xdd };
+
+ printk("%s\n", __func__);
+
+ switch (c) {
+ case 0xc0:
+ memcpy(skb_put(skb, 2), &esc_c0, 2);
+ break;
+ case 0xdb:
+ memcpy(skb_put(skb, 2), &esc_db, 2);
+ break;
+ default:
+ memcpy(skb_put(skb, 1), &c, 1);
+ }
+}
+
+static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
+{
+ struct h5_struct *h5 = hu->priv;
+
+ printk("%s\n", __func__);
+
+ if (skb->len > 0xFFF) {
+ BT_ERR("Packet too long");
+ kfree_skb(skb);
+ return 0;
+ }
+
+ switch (bt_cb(skb)->pkt_type) {
+ case HCI_ACLDATA_PKT:
+ case HCI_COMMAND_PKT:
+ skb_queue_tail(&h5->rel, skb);
+ break;
+
+ case HCI_SCODATA_PKT:
+ skb_queue_tail(&h5->unrel, skb);
+ break;
+
+ default:
+ BT_ERR("Unknown packet type");
+ kfree_skb(skb);
+ break;
+ }
+
+ return 0;
+}
+
+static struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
+ int len, int pkt_type)
+{
+ struct sk_buff *nskb;
+ u8 hdr[4], chan;
+ u16 H5_CRC_INIT(h5_txmsg_crc);
+ int rel, i;
+
+ printk("%s\n", __func__);
+ printk("packet type %d\n", pkt_type);
+
+ switch (pkt_type) {
+ case HCI_ACLDATA_PKT:
+ chan = 2; /* H5 ACL channel */
+ rel = 1; /* reliable channel */
+ break;
+ case HCI_COMMAND_PKT:
+ chan = 1; /* H5 cmd/evt channel */
+ rel = 1; /* reliable channel */
+ break;
+ case HCI_SCODATA_PKT:
+ chan = 3; /* H5 SCO channel */
+ rel = 0; /* unreliable channel */
+ break;
+ case H5_LE_PKT:
+ chan = 15; /* H5 LE channel */
+ rel = 0; /* unreliable channel */
+ break;
+ case H5_ACK_PKT:
+ chan = 0; /* H5 internal channel */
+ rel = 0; /* unreliable channel */
+ break;
+ default:
+ BT_ERR("Unknown packet type");
+ return NULL;
+ }
+
+ printk("chan %d\n", chan);
+
+ if (h5extn && chan == 14) {
+ __le16 opcode = ((struct hci_command_hdr *)data)->opcode;
+
+ /* Vendor specific commands */
+ if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) {
+ u8 desc = *(data + HCI_COMMAND_HDR_SIZE);
+ if ((desc & 0xf0) == 0xc0) {
+ data += HCI_COMMAND_HDR_SIZE + 1;
+ len -= HCI_COMMAND_HDR_SIZE + 1;
+ chan = desc & 0x0f;
+ }
+ }
+ }
+
+ /* Max len of packet: (original len +4(h5 hdr) +2(crc))*2
+ (because bytes 0xc0 and 0xdb are escaped, worst case is
+ when the packet is all made of 0xc0 and 0xdb :) )
+ + 2 (0xc0 delimiters at start and end). */
+
+ nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC);
+ if (!nskb)
+ return NULL;
+
+ bt_cb(nskb)->pkt_type = pkt_type;
+
+ printk("starting delim\n");
+ h5_slip_msgdelim(nskb);
+
+ hdr[0] = h5->rxseq_txack << 2;
+ h5->txack_req = 0;
+ BT_DBG("We request packet no %u to card\n", h5->rxseq_txack);
+
+ if (rel) {
+ hdr[0] |= 0x01 + (h5->msgq_txseq << 5);
+ BT_DBG("Sending packet with seqno %u\n", h5->msgq_txseq);
+ h5->msgq_txseq = (h5->msgq_txseq + 1) & 0x07;
+ }
+
+ if (h5->use_crc)
+ hdr[0] |= 0x02;
+
+ hdr[1] = (len >> 4) | chan << 4;
+ hdr[2] = (len & 0xff) << 4;
+ hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]);
+
+ /* Put H5 header */
+ for (i = 0; i < 4; i++) {
+ h5_slip_one_byte(nskb, hdr[i]);
+
+ if (h5->use_crc)
+ h5_crc_update(&h5_txmsg_crc, hdr[i]);
+ }
+
+ /* Put payload */
+ for (i = 0; i < len; i++) {
+ h5_slip_one_byte(nskb, data[i]);
+
+ if (h5->use_crc)
+ h5_crc_update(&h5_txmsg_crc, data[i]);
+ }
+
+ /* Put CRC */
+ if (h5->use_crc) {
+ h5_txmsg_crc = bitrev16(h5_txmsg_crc);
+ h5_slip_one_byte(nskb, (u8) ((h5_txmsg_crc >> 8) & 0x00ff));
+ h5_slip_one_byte(nskb, (u8) (h5_txmsg_crc & 0x00ff));
+ }
+
+ printk("ending delim\n");
+ h5_slip_msgdelim(nskb);
+ return nskb;
+}
+
+/* This is a rewrite of pkt_avail in AH5 */
+static struct sk_buff *h5_dequeue(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ unsigned long flags;
+ struct sk_buff *skb;
+
+ printk("%s\n", __func__);
+
+ /* First of all, check for unreliable messages in the queue,
+ since they have priority */
+
+ if ((skb = skb_dequeue(&h5->unrel)) != NULL) {
+ printk("got skb\n");
+
+ struct sk_buff *nskb = h5_prepare_pkt(h5, skb->data, skb->len, bt_cb(skb)->pkt_type);
+ if (nskb) {
+ kfree_skb(skb);
+ return nskb;
+ } else {
+ skb_queue_head(&h5->unrel, skb);
+ BT_ERR("Could not dequeue pkt because alloc_skb failed");
+ }
+ }
+
+ printk("after skb\n");
+
+ /* Now, try to send a reliable pkt. We can only send a
+ reliable packet if the number of packets sent but not yet ack'ed
+ is < than the winsize */
+
+ spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
+
+ if (h5->unack.qlen < H5_TXWINSIZE && (skb = skb_dequeue(&h5->rel)) != NULL) {
+ struct sk_buff *nskb = h5_prepare_pkt(h5, skb->data, skb->len, bt_cb(skb)->pkt_type);
+ if (nskb) {
+ __skb_queue_tail(&h5->unack, skb);
+ mod_timer(&h5->th5, jiffies + HZ / 4);
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+ return nskb;
+ } else {
+ skb_queue_head(&h5->rel, skb);
+ BT_ERR("Could not dequeue pkt because alloc_skb failed");
+ }
+ }
+
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+
+ printk("after spin_unlock\n");
+
+ /* 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 ? */
+
+ if (h5->txack_req) {
+ /* if so, craft an empty ACK pkt and send it on H5 unreliable
+ channel 0 */
+ struct sk_buff *nskb = h5_prepare_pkt(h5, NULL, 0, H5_ACK_PKT);
+ return nskb;
+ }
+
+ printk("we have nothing to send\n");
+ /* We have nothing to send */
+ return NULL;
+}
+
+static int h5_flush(struct hci_uart *hu)
+{
+ BT_DBG("hu %p", hu);
+ printk("%s\n", __func__);
+ return 0;
+}
+
+/* Remove ack'ed packets */
+static void h5_pkt_cull(struct h5_struct *h5)
+{
+ struct sk_buff *skb, *tmp;
+ unsigned long flags;
+ int i, pkts_to_be_removed;
+ u8 seqno;
+
+ printk("%s\n", __func__);
+
+ spin_lock_irqsave(&h5->unack.lock, flags);
+
+ pkts_to_be_removed = skb_queue_len(&h5->unack);
+ seqno = h5->msgq_txseq;
+
+ while (pkts_to_be_removed) {
+ if (h5->rxack == seqno)
+ break;
+ pkts_to_be_removed--;
+ seqno = (seqno - 1) & 0x07;
+ }
+
+ if (h5->rxack != seqno)
+ BT_ERR("Peer acked invalid packet");
+
+ BT_DBG("Removing %u pkts out of %u, up to seqno %u",
+ pkts_to_be_removed, skb_queue_len(&h5->unack),
+ (seqno - 1) & 0x07);
+
+ i = 0;
+ skb_queue_walk_safe(&h5->unack, skb, tmp) {
+ if (i >= pkts_to_be_removed)
+ break;
+ i++;
+
+ __skb_unlink(skb, &h5->unack);
+ kfree_skb(skb);
+ }
+
+ if (skb_queue_empty(&h5->unack))
+ del_timer(&h5->th5);
+
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+
+ if (i != pkts_to_be_removed)
+ BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed);
+}
+
+/* Handle H5 link-establishment packets. When we
+ detect a "sync" packet, symptom that the BT module has reset,
+ we do nothing :) (yet) */
+static void h5_handle_le_pkt(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed };
+ u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 };
+ u8 sync_pkt[4] = { 0x00, 0xd0, 0x01, 0x7e };
+
+ printk("%s\n", __func__);
+
+ /* spot "conf" pkts and reply with a "conf rsp" pkt */
+ if (h5->rx_skb->data[1] >> 4 == 4 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], conf_pkt, 4)) {
+ struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC);
+
+ BT_DBG("Found a LE conf pkt");
+ if (!nskb)
+ return;
+ memcpy(skb_put(nskb, 4), conf_rsp_pkt, 4);
+ bt_cb(nskb)->pkt_type = H5_LE_PKT;
+
+ skb_queue_head(&h5->unrel, nskb);
+ hci_uart_tx_wakeup(hu);
+ }
+ /* Spot "sync" pkts. If we find one...disaster! */
+ else if (h5->rx_skb->data[1] >> 4 == 4 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], sync_pkt, 4)) {
+ BT_ERR("Found a LE sync pkt, card has reset");
+ }
+}
+
+static inline void h5_unslip_one_byte(struct h5_struct *h5, unsigned char byte)
+{
+ const u8 c0 = 0xc0, db = 0xdb;
+
+ printk("%s\n", __func__);
+
+ switch (h5->rx_esc_state) {
+ case H5_ESCSTATE_NOESC:
+ switch (byte) {
+ case 0xdb:
+ h5->rx_esc_state = H5_ESCSTATE_ESC;
+ break;
+ default:
+ memcpy(skb_put(h5->rx_skb, 1), &byte, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5->message_crc, byte);
+ h5->rx_count--;
+ }
+ break;
+
+ case H5_ESCSTATE_ESC:
+ switch (byte) {
+ case 0xdc:
+ memcpy(skb_put(h5->rx_skb, 1), &c0, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, 0xc0);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ case 0xdd:
+ memcpy(skb_put(h5->rx_skb, 1), &db, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, 0xdb);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ default:
+ BT_ERR ("Invalid byte %02x after esc byte", byte);
+ kfree_skb(h5->rx_skb);
+ h5->rx_skb = NULL;
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ }
+ }
+}
+
+static void h5_complete_rx_pkt(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ int pass_up;
+
+ printk("%s\n", __func__);
+
+ if (h5->rx_skb->data[0] & 0x80) { /* reliable pkt */
+ BT_DBG("Received seqno %u from card", h5->rxseq_txack);
+ h5->rxseq_txack++;
+ h5->rxseq_txack %= 0x8;
+ h5->txack_req = 1;
+
+ /* If needed, transmit an ack pkt */
+ hci_uart_tx_wakeup(hu);
+ }
+
+ h5->rxack = (h5->rx_skb->data[0] >> 3) & 0x07;
+ BT_DBG("Request for pkt %u from card", h5->rxack);
+
+ h5_pkt_cull(h5);
+ if ((h5->rx_skb->data[1] & 0x0f) == 2 &&
+ h5->rx_skb->data[0] & 0x80) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_ACLDATA_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 4 &&
+ h5->rx_skb->data[0] & 0x80) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_EVENT_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 3) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_SCODATA_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 15 &&
+ !(h5->rx_skb->data[0] & 0x80)) {
+ h5_handle_le_pkt(hu);
+ pass_up = 0;
+ } else
+ pass_up = 0;
+
+ if (!pass_up) {
+ struct hci_event_hdr hdr;
+ u8 desc = (h5->rx_skb->data[1] & 0x0f);
+
+ if (desc != 0 && desc != 1) {
+ if (h5extn) {
+ desc |= 0xc0;
+ skb_pull(h5->rx_skb, 4);
+ memcpy(skb_push(h5->rx_skb, 1), &desc, 1);
+
+ hdr.evt = 0xff;
+ hdr.plen = h5->rx_skb->len;
+ memcpy(skb_push(h5->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE);
+ bt_cb(h5->rx_skb)->pkt_type = HCI_EVENT_PKT;
+
+ hci_recv_frame(h5->rx_skb);
+ } else {
+ BT_ERR ("Packet for unknown channel (%u %s)",
+ h5->rx_skb->data[1] & 0x0f,
+ h5->rx_skb->data[0] & 0x80 ?
+ "reliable" : "unreliable");
+ kfree_skb(h5->rx_skb);
+ }
+ } else
+ kfree_skb(h5->rx_skb);
+ } else {
+ /* Pull out H5 hdr */
+ skb_pull(h5->rx_skb, 4);
+
+ hci_recv_frame(h5->rx_skb);
+ }
+
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_skb = NULL;
+}
+
+static u16 h5_get_crc(struct h5_struct *h5)
+{
+ printk("%s\n", __func__);
+
+ return get_unaligned_be16(&h5->rx_skb->data[h5->rx_skb->len - 2]);
+}
+
+/* Recv data */
+static int h5_recv(struct hci_uart *hu, void *data, int count)
+{
+ struct h5_struct *h5 = hu->priv;
+ register unsigned char *ptr;
+
+ printk("%s\n", __func__);
+
+ BT_DBG("hu %p count %d rx_state %d rx_count %ld",
+ hu, count, h5->rx_state, h5->rx_count);
+
+ ptr = data;
+ while (count) {
+ if (h5->rx_count) {
+ if (*ptr == 0xc0) {
+ BT_ERR("Short H5 packet");
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_START;
+ h5->rx_count = 0;
+ } else
+ h5_unslip_one_byte(h5, *ptr);
+
+ ptr++; count--;
+ continue;
+ }
+
+ switch (h5->rx_state) {
+ case H5_W4_H5_HDR:
+ if ((0xff & (u8) ~ (h5->rx_skb->data[0] + h5->rx_skb->data[1] +
+ h5->rx_skb->data[2])) != h5->rx_skb->data[3]) {
+ BT_ERR("Error in H5 hdr checksum");
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ continue;
+ }
+ if (h5->rx_skb->data[0] & 0x80 /* reliable pkt */
+ && (h5->rx_skb->data[0] & 0x07) != h5->rxseq_txack) {
+ BT_ERR ("Out-of-order packet arrived, got %u expected %u",
+ h5->rx_skb->data[0] & 0x07, h5->rxseq_txack);
+
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ continue;
+ }
+ h5->rx_state = H5_W4_DATA;
+ h5->rx_count = (h5->rx_skb->data[1] >> 4) +
+ (h5->rx_skb->data[2] << 4); /* May be 0 */
+ continue;
+
+ case H5_W4_DATA:
+ if (h5->rx_skb->data[0] & 0x40) { /* pkt with crc */
+ h5->rx_state = H5_W4_CRC;
+ h5->rx_count = 2;
+ } else
+ h5_complete_rx_pkt(hu);
+ continue;
+
+ case H5_W4_CRC:
+ if (bitrev16(h5->message_crc) != h5_get_crc(h5)) {
+ BT_ERR ("Checksum failed: computed %04x received %04x",
+ bitrev16(h5->message_crc),
+ h5_get_crc(h5));
+
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ continue;
+ }
+ skb_trim(h5->rx_skb, h5->rx_skb->len - 2);
+ h5_complete_rx_pkt(hu);
+ continue;
+
+ case H5_W4_PKT_DELIMITER:
+ switch (*ptr) {
+ case 0xc0:
+ h5->rx_state = H5_W4_PKT_START;
+ break;
+ default:
+ /*BT_ERR("Ignoring byte %02x", *ptr);*/
+ break;
+ }
+ ptr++; count--;
+ break;
+
+ case H5_W4_PKT_START:
+ switch (*ptr) {
+ case 0xc0:
+ ptr++; count--;
+ break;
+
+ default:
+ h5->rx_state = H5_W4_H5_HDR;
+ h5->rx_count = 4;
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ H5_CRC_INIT(h5->message_crc);
+
+ /* Do not increment ptr or decrement count
+ * Allocate packet. Max len of a H5 pkt=
+ * 0xFFF (payload) +4 (header) +2 (crc) */
+
+ h5->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC);
+ if (!h5->rx_skb) {
+ BT_ERR("Can't allocate mem for new packet");
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ return 0;
+ }
+ h5->rx_skb->dev = (void *) hu->hdev;
+ break;
+ }
+ break;
+ }
+ }
+ return count;
+}
+
+ /* Arrange to retransmit all messages in the relq. */
+static void h5_timed_event(unsigned long arg)
+{
+ struct hci_uart *hu = (struct hci_uart *) arg;
+ struct h5_struct *h5 = hu->priv;
+ struct sk_buff *skb;
+ unsigned long flags;
+
+ printk("%s\n", __func__);
+
+ 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_struct *h5;
+
+ printk("%s\n", __func__);
+
+ BT_DBG("hu %p", hu);
+
+ h5 = kzalloc(sizeof(*h5), GFP_ATOMIC);
+ if (!h5)
+ return -ENOMEM;
+
+ hu->priv = h5;
+ skb_queue_head_init(&h5->unack);
+ skb_queue_head_init(&h5->rel);
+ skb_queue_head_init(&h5->unrel);
+
+ init_timer(&h5->th5);
+ h5->th5.function = h5_timed_event;
+ h5->th5.data = (u_long) hu;
+
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+
+ if (h5txcrc)
+ h5->use_crc = 1;
+
+ return 0;
+}
+
+static int h5_close(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ hu->priv = NULL;
+
+ printk("%s\n", __func__);
+
+ BT_DBG("hu %p", hu);
+
+ skb_queue_purge(&h5->unack);
+ skb_queue_purge(&h5->rel);
+ skb_queue_purge(&h5->unrel);
+ del_timer(&h5->th5);
+
+ kfree(h5);
+ return 0;
+}
+
+static struct hci_uart_proto h5 = {
+ .id = HCI_UART_H5,
+ .open = h5_open,
+ .close = h5_close,
+ .enqueue = h5_enqueue,
+ .dequeue = h5_dequeue,
+ .recv = h5_recv,
+ .flush = h5_flush
+};
+
+int h5_init(void)
+{
+ int err = hci_uart_register_proto(&h5);
+
+ printk("%s\n", __func__);
+
+ if (!err)
+ BT_INFO("HCI H5 protocol initialized");
+ else
+ BT_ERR("HCI H5 protocol registration failed");
+
+ return err;
+}
+
+int h5_deinit(void)
+{
+ printk("%s\n", __func__);
+
+ return hci_uart_unregister_proto(&h5);
+}
+
+module_param(h5txcrc, bool, 0644);
+MODULE_PARM_DESC(h5txcrc, "Transmit CRC with every H5 packet");
+
+module_param(h5extn, bool, 0644);
+MODULE_PARM_DESC(h5extn, "Convert HCI Extensions into H5 packets");
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 058fbcc..28daf2d 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -58,6 +58,17 @@ config BT_HCIUART_BCSP

Say Y here to compile support for HCI BCSP protocol.

+config BT_HCIUART_H5
+ bool "H5 protocol support"
+ depends on BT_HCIUART
+ select BITREVERSE
+ help
+ H5, also called 3 Wire or SLIP, is serial protocol for communication
+ between Bluetooth device and host. This protocol can be used when
+ no CTS/RTS, hardware flow control lines, are available.
+
+ Say Y here to compile support for HCI H5 protocol.
+
config BT_HCIUART_LL
bool "HCILL protocol support"
depends on BT_HCIUART
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 7e5aed5..452fc24 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -26,4 +26,5 @@ hci_uart-y := hci_ldisc.o
hci_uart-$(CONFIG_BT_HCIUART_H4) += hci_h4.o
hci_uart-$(CONFIG_BT_HCIUART_BCSP) += hci_bcsp.o
hci_uart-$(CONFIG_BT_HCIUART_LL) += hci_ll.o
+hci_uart-$(CONFIG_BT_HCIUART_H5) += hci_h5.o
hci_uart-objs := $(hci_uart-y)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
new file mode 100644
index 0000000..e2a1f69
--- /dev/null
+++ b/drivers/bluetooth/hci_h5.c
@@ -0,0 +1,817 @@
+/*
+ *
+ * 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
+ *
+ */
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/poll.h>
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/ioctl.h>
+#include <linux/skbuff.h>
+#include <linux/bitrev.h>
+#include <asm/unaligned.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include <linux/crc16.h>
+
+#include "hci_uart.h"
+
+#define VERSION "0.3"
+#undef BT_DBG
+#define BT_DBG printk
+
+static int h5txcrc = 1;
+static int h5extn = 1;
+
+#define H5_TXWINSIZE 4
+
+#define H5_ACK_PKT 0x00
+#define H5_LE_PKT 0x0f
+
+struct h5_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 th5;
+
+ enum {
+ H5_W4_PKT_DELIMITER,
+ H5_W4_PKT_START,
+ H5_W4_H5_HDR,
+ H5_W4_DATA,
+ H5_W4_CRC1,
+ H5_W4_CRC
+ } rx_state;
+
+ enum {
+ H5_ESCSTATE_NOESC,
+ H5_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;
+};
+
+/* ---- H5 CRC calculation ---- */
+
+/* Table for calculating CRC for polynomial 0x1021, LSB processed first,
+initial value 0xffff, bits shifted in reverse order. */
+
+static const u16 crc_table[] = {
+ 0x0000, 0x1081, 0x2102, 0x3183,
+ 0x4204, 0x5285, 0x6306, 0x7387,
+ 0x8408, 0x9489, 0xa50a, 0xb58b,
+ 0xc60c, 0xd68d, 0xe70e, 0xf78f
+};
+
+/* Initialise the crc calculator */
+#define H5_CRC_INIT(x) x = 0xffff
+
+/*
+ Update crc with next data byte
+
+ Implementation note
+ The data byte is treated as two nibbles. The crc is generated
+ in reverse, i.e., bits are fed into the register from the top.
+*/
+static void h5_crc_update(u16 *crc, u8 d)
+{
+ u16 reg = *crc;
+
+ reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f];
+ reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f];
+
+ *crc = reg;
+}
+
+/* ---- H5 core ---- */
+
+static void h5_slip_msgdelim(struct sk_buff *skb)
+{
+ const char pkt_delim = 0xc0;
+
+ memcpy(skb_put(skb, 1), &pkt_delim, 1);
+}
+
+static void h5_slip_one_byte(struct sk_buff *skb, u8 c)
+{
+ const char esc_c0[2] = { 0xdb, 0xdc };
+ const char esc_db[2] = { 0xdb, 0xdd };
+
+ switch (c) {
+ case 0xc0:
+ memcpy(skb_put(skb, 2), &esc_c0, 2);
+ break;
+ case 0xdb:
+ memcpy(skb_put(skb, 2), &esc_db, 2);
+ break;
+ default:
+ memcpy(skb_put(skb, 1), &c, 1);
+ }
+}
+
+static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
+{
+ struct h5_struct *h5 = hu->priv;
+
+ if (skb->len > 0xFFF) {
+ BT_ERR("Packet too long");
+ kfree_skb(skb);
+ return 0;
+ }
+
+ switch (bt_cb(skb)->pkt_type) {
+ case HCI_ACLDATA_PKT:
+ case HCI_COMMAND_PKT:
+ skb_queue_tail(&h5->rel, skb);
+ break;
+
+ case HCI_SCODATA_PKT:
+ skb_queue_tail(&h5->unrel, skb);
+ break;
+
+ default:
+ BT_ERR("Unknown packet type");
+ kfree_skb(skb);
+ break;
+ }
+
+ return 0;
+}
+
+static struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
+ int len, int pkt_type)
+{
+ struct sk_buff *nskb;
+ u8 hdr[4], chan;
+ u16 H5_CRC_INIT(h5_txmsg_crc);
+ int rel, i;
+
+ print_hex_dump_bytes("h5_prepare_pkt ", DUMP_PREFIX_NONE, data, len);
+
+ switch (pkt_type) {
+ case HCI_ACLDATA_PKT:
+ chan = 2; /* H5 ACL channel */
+ rel = 1; /* reliable channel */
+ break;
+ case HCI_COMMAND_PKT:
+ chan = 1; /* H5 cmd/evt channel */
+ rel = 1; /* reliable channel */
+ break;
+ case HCI_SCODATA_PKT:
+ chan = 3; /* H5 SCO channel */
+ rel = 0; /* unreliable channel */
+ break;
+ case H5_LE_PKT:
+ chan = 15; /* H5 LE channel */
+ rel = 0; /* unreliable channel */
+ break;
+ case H5_ACK_PKT:
+ chan = 0; /* H5 internal channel */
+ rel = 0; /* unreliable channel */
+ break;
+ default:
+ BT_ERR("Unknown packet type");
+ return NULL;
+ }
+
+ if (h5extn && chan == 14) {
+ __le16 opcode = ((struct hci_command_hdr *)data)->opcode;
+
+ /* Vendor specific commands */
+ if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) {
+ u8 desc = *(data + HCI_COMMAND_HDR_SIZE);
+ if ((desc & 0xf0) == 0xc0) {
+ data += HCI_COMMAND_HDR_SIZE + 1;
+ len -= HCI_COMMAND_HDR_SIZE + 1;
+ chan = desc & 0x0f;
+ }
+ }
+ }
+
+ /* Max len of packet: (original len +4(h5 hdr) +2(crc))*2
+ (because bytes 0xc0 and 0xdb are escaped, worst case is
+ when the packet is all made of 0xc0 and 0xdb :) )
+ + 2 (0xc0 delimiters at start and end). */
+
+ nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC);
+ if (!nskb)
+ return NULL;
+
+ bt_cb(nskb)->pkt_type = pkt_type;
+
+ h5_slip_msgdelim(nskb);
+
+ hdr[0] = h5->rxseq_txack << 3;
+ h5->txack_req = 0;
+
+ if (rel) {
+ hdr[0] |= 0x80 + h5->msgq_txseq;
+ BT_DBG("Sending packet with seqno %u\n", h5->msgq_txseq);
+ }
+
+ if (h5->use_crc)
+ hdr[0] |= 0x40;
+
+ hdr[1] = ((len << 4) & 0xff) | chan;
+ hdr[2] = len >> 4;
+ hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]);
+
+ /* Put H5 header */
+ for (i = 0; i < 4; i++) {
+ h5_slip_one_byte(nskb, hdr[i]);
+
+ if (h5->use_crc) {
+ h5_crc_update(&h5_txmsg_crc, hdr[i]);
+ }
+ }
+
+ /* Put payload */
+ for (i = 0; i < len; i++) {
+ h5_slip_one_byte(nskb, data[i]);
+
+ if (h5->use_crc) {
+ h5_crc_update(&h5_txmsg_crc, data[i]);
+ }
+ }
+
+ /* Put CRC */
+ if (h5->use_crc) {
+ h5_txmsg_crc = bitrev16(h5_txmsg_crc);
+ h5_slip_one_byte(nskb, (u8) ((h5_txmsg_crc >> 8) & 0x00ff));
+ h5_slip_one_byte(nskb, (u8) (h5_txmsg_crc & 0x00ff));
+ }
+
+ h5_slip_msgdelim(nskb);
+
+ print_hex_dump_bytes("h5_tx ", DUMP_PREFIX_NONE, nskb->data, nskb->len);
+ return nskb;
+}
+
+/* This is a rewrite of pkt_avail in AH5 */
+static struct sk_buff *h5_dequeue(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ unsigned long flags;
+ struct sk_buff *skb;
+
+ /* First of all, check for unreliable messages in the queue,
+ since they have priority */
+
+ if ((skb = skb_dequeue(&h5->unrel)) != NULL) {
+ struct sk_buff *nskb = h5_prepare_pkt(h5, skb->data, skb->len, bt_cb(skb)->pkt_type);
+ if (nskb) {
+ return nskb;
+ } else {
+ skb_queue_head(&h5->unrel, skb);
+ BT_ERR("Could not dequeue pkt because alloc_skb failed");
+ }
+ }
+
+ /* Now, try to send a reliable pkt. We can only send a
+ reliable packet if the number of packets sent but not yet ack'ed
+ is < than the winsize */
+
+ spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
+
+ if (h5->unack.qlen < H5_TXWINSIZE && (skb = skb_dequeue(&h5->rel)) != NULL) {
+ struct sk_buff *nskb = h5_prepare_pkt(h5, skb->data, skb->len, bt_cb(skb)->pkt_type);
+ if (nskb) {
+ __skb_queue_tail(&h5->unack, skb);
+ mod_timer(&h5->th5, jiffies + HZ / 4);
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+ return nskb;
+ } else {
+ skb_queue_head(&h5->rel, skb);
+ BT_ERR("Could not dequeue pkt because alloc_skb failed");
+ }
+ }
+
+ spin_unlock_irqrestore(&h5->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 ? */
+
+ if (h5->txack_req) {
+ /* if so, craft an empty ACK pkt and send it on H5 unreliable
+ channel 0 */
+ struct sk_buff *nskb = h5_prepare_pkt(h5, NULL, 0, H5_ACK_PKT);
+ return nskb;
+ }
+
+ /* We have nothing to send */
+ return NULL;
+}
+
+static int h5_flush(struct hci_uart *hu)
+{
+ BT_DBG("hu %p\n", hu);
+ return 0;
+}
+
+/* Remove ack'ed packets */
+static void h5_pkt_cull(struct h5_struct *h5)
+{
+ struct sk_buff *skb, *tmp;
+ unsigned long flags;
+ int i, pkts_to_be_removed;
+ u8 seqno;
+
+ spin_lock_irqsave(&h5->unack.lock, flags);
+
+ pkts_to_be_removed = skb_queue_len(&h5->unack);
+
+ seqno = h5->msgq_txseq;
+
+ while (pkts_to_be_removed) {
+ if (((h5->rxack - 1) & 0x07) == seqno)
+ break;
+
+ pkts_to_be_removed--;
+ seqno = (seqno + 1) & 0x07;
+ }
+
+/*
+ if (h5->rxack != seqno)
+ BT_ERR("Peer acked invalid packet");
+*/
+
+ BT_DBG("Removing %u pkts out of %u, up to seqno %u\n",
+ pkts_to_be_removed, skb_queue_len(&h5->unack),
+ (seqno - 1) & 0x07);
+
+ i = 0;
+ skb_queue_walk_safe(&h5->unack, skb, tmp) {
+ if (i >= pkts_to_be_removed)
+ break;
+ i++;
+
+ __skb_unlink(skb, &h5->unack);
+ kfree_skb(skb);
+ }
+
+ if (skb_queue_empty(&h5->unack))
+ del_timer(&h5->th5);
+
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+
+ if (i != pkts_to_be_removed)
+ BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed);
+}
+
+/* Handle H5 link-establishment packets. When we
+ detect a "sync" packet, symptom that the BT module has reset,
+ we do nothing :) (yet) */
+
+static void h5_handle_le_pkt(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed };
+ u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 };
+ u8 sync_pkt[4] = { 0x00, 0xd0, 0x01, 0x7e };
+
+ /* spot "conf" pkts and reply with a "conf rsp" pkt */
+ if (h5->rx_skb->data[1] >> 4 == 4 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], conf_pkt, 4)) {
+ struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC);
+
+ BT_DBG("Found a LE conf pkt\n");
+ if (!nskb)
+ return;
+ memcpy(skb_put(nskb, 4), conf_rsp_pkt, 4);
+ bt_cb(nskb)->pkt_type = H5_LE_PKT;
+
+ skb_queue_head(&h5->unrel, nskb);
+ hci_uart_tx_wakeup(hu);
+ }
+ /* Spot "sync" pkts. If we find one...disaster! */
+ else if (h5->rx_skb->data[1] >> 4 == 4 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], sync_pkt, 4)) {
+ BT_ERR("Found a LE sync pkt, card has reset");
+ }
+}
+
+static inline void h5_unslip_one_byte(struct h5_struct *h5, unsigned char byte)
+{
+ const u8 c0 = 0xc0, db = 0xdb;
+
+ switch (h5->rx_esc_state) {
+ case H5_ESCSTATE_NOESC:
+ switch (byte) {
+ case 0xdb:
+ h5->rx_esc_state = H5_ESCSTATE_ESC;
+ break;
+ default:
+ memcpy(skb_put(h5->rx_skb, 1), &byte, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5->message_crc, byte);
+ h5->rx_count--;
+ }
+ break;
+
+ case H5_ESCSTATE_ESC:
+ switch (byte) {
+ case 0xdc:
+ memcpy(skb_put(h5->rx_skb, 1), &c0, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, 0xc0);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ case 0xdd:
+ memcpy(skb_put(h5->rx_skb, 1), &db, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, 0xdb);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ case 0xdf:
+ memcpy(skb_put(h5->rx_skb, 1), &db, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, 0x13);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ case 0xde:
+ memcpy(skb_put(h5->rx_skb, 1), &db, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, 0x11);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ default:
+ BT_ERR ("Invalid byte %02x after esc byte", byte);
+ kfree_skb(h5->rx_skb);
+ h5->rx_skb = NULL;
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ }
+ }
+}
+
+static void h5_complete_rx_pkt(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ int pass_up;
+
+ if (h5->rx_skb->data[0] & 0x80) { /* reliable pkt */
+ BT_DBG("Received seqno %u from card\n", h5->rxseq_txack);
+ h5->rxseq_txack++;
+ h5->rxseq_txack %= 0x8;
+ h5->txack_req = 1;
+
+ /* If needed, transmit an ack pkt */
+ hci_uart_tx_wakeup(hu);
+ }
+
+ h5->rxack = (h5->rx_skb->data[0] >> 3) & 0x07;
+ BT_DBG("Request for pkt %u from card\n", h5->rxack);
+
+ h5_pkt_cull(h5);
+
+ if ((h5->rx_skb->data[1] & 0x0f) == 2 &&
+ h5->rx_skb->data[0] & 0x80) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_ACLDATA_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 4 &&
+ h5->rx_skb->data[0] & 0x80) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_EVENT_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 3) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_SCODATA_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 15 &&
+ !(h5->rx_skb->data[0] & 0x80)) {
+ h5_handle_le_pkt(hu);
+ pass_up = 0;
+ } else
+ pass_up = 0;
+
+ if (!pass_up) {
+ struct hci_event_hdr hdr;
+ u8 desc = (h5->rx_skb->data[1] & 0x0f);
+
+ if (desc != 0 && desc != 1) {
+ if (h5extn) {
+ desc |= 0xc0;
+ skb_pull(h5->rx_skb, 4);
+ memcpy(skb_push(h5->rx_skb, 1), &desc, 1);
+
+ hdr.evt = 0xff;
+ hdr.plen = h5->rx_skb->len;
+ memcpy(skb_push(h5->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE);
+ bt_cb(h5->rx_skb)->pkt_type = HCI_EVENT_PKT;
+
+ hci_recv_frame(h5->rx_skb);
+ } else {
+ BT_ERR ("Packet for unknown channel (%u %s)",
+ h5->rx_skb->data[1] & 0x0f,
+ h5->rx_skb->data[0] & 0x80 ?
+ "reliable" : "unreliable");
+ kfree_skb(h5->rx_skb);
+ }
+ } else
+ kfree_skb(h5->rx_skb);
+ } else {
+ /* Pull out H5 hdr */
+ skb_pull(h5->rx_skb, 4);
+
+ hci_recv_frame(h5->rx_skb);
+ }
+
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_skb = NULL;
+}
+
+static u16 h5_get_crc(struct h5_struct *h5)
+{
+ return get_unaligned_be16(&h5->rx_skb->data[h5->rx_skb->len - 2]);
+}
+
+/* Recv data */
+static int h5_recv(struct hci_uart *hu, void *data, int count)
+{
+ struct h5_struct *h5 = hu->priv;
+ register unsigned char *ptr;
+ int i;
+
+ BT_DBG("hu %p count %d rx_state %d rx_count %ld\n",
+ hu, count, h5->rx_state, h5->rx_count);
+
+ print_hex_dump_bytes("h5_recv ", DUMP_PREFIX_NONE, data, count);
+
+ ptr = data;
+
+ while (count) {
+ if (h5->rx_count) {
+ if (*ptr == 0xc0) {
+ BT_ERR("Short H5 packet");
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_START;
+ h5->rx_count = 0;
+ } else
+ h5_unslip_one_byte(h5, *ptr);
+
+ ptr++; count--;
+ continue;
+ }
+
+ switch (h5->rx_state) {
+ case H5_W4_H5_HDR:
+ if ((0xff & (u8) ~ (h5->rx_skb->data[0] + h5->rx_skb->data[1] +
+ h5->rx_skb->data[2])) != h5->rx_skb->data[3]) {
+ BT_ERR("Error in H5 hdr checksum");
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ continue;
+ }
+
+
+ if (h5->rx_skb->data[0] & 0x80) { /* reliable pkt */
+ printk("%0x != %0x ? %d\n", h5->rx_skb->data[0] & 0x07,
+ h5->rxseq_txack,
+ (h5->rx_skb->data[0] & 0x07) != h5->rxseq_txack);
+
+ if ((h5->rx_skb->data[0] & 0x07) != h5->rxseq_txack) {
+ BT_ERR ("Out-of-order packet arrived, got %u expected %u",
+ h5->rx_skb->data[0] & 0x07, h5->rxseq_txack);
+
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ continue;
+ }
+ }
+
+ h5->rx_state = H5_W4_DATA;
+ h5->rx_count = (h5->rx_skb->data[1] >> 4) +
+ (h5->rx_skb->data[2] << 4); /* May be 0 */
+ continue;
+
+ case H5_W4_DATA:
+ if (h5->rx_skb->data[0] & 0x40) { /* pkt with crc */
+ // h5->rx_state = H5_W4_CRC1;
+ h5->rx_state = H5_W4_CRC;
+ h5->rx_count = 2;
+ } else {
+ h5_complete_rx_pkt(hu);
+ }
+
+ continue;
+
+ case H5_W4_CRC1:
+ h5->rx_state = H5_W4_CRC;
+ count--;
+ continue;
+
+ case H5_W4_CRC:
+ if (bitrev16(h5->message_crc) != h5_get_crc(h5)) {
+ BT_ERR ("Checksum failed: computed %04x received %04x",
+ bitrev16(h5->message_crc),
+ h5_get_crc(h5));
+
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ continue;
+ }
+
+ skb_trim(h5->rx_skb, h5->rx_skb->len - 2);
+ h5_complete_rx_pkt(hu);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ count--;
+ continue;
+
+ case H5_W4_PKT_DELIMITER:
+ switch (*ptr) {
+ case 0xc0:
+ h5->rx_state = H5_W4_PKT_START;
+ break;
+ default:
+ /*BT_ERR("Ignoring byte %02x", *ptr);*/
+ break;
+ }
+ ptr++; count--;
+ break;
+
+ case H5_W4_PKT_START:
+ switch (*ptr) {
+ case 0xc0:
+ ptr++; count--;
+ break;
+
+ default:
+ h5->rx_state = H5_W4_H5_HDR;
+ h5->rx_count = 4;
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ H5_CRC_INIT(h5->message_crc);
+
+ /* Do not increment ptr or decrement count
+ * Allocate packet. Max len of a H5 pkt=
+ * 0xFFF (payload) +4 (header) +2 (crc) */
+
+ h5->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC);
+ if (!h5->rx_skb) {
+ BT_ERR("Can't allocate mem for new packet");
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ return 0;
+ }
+ h5->rx_skb->dev = (void *) hu->hdev;
+ break;
+ }
+ break;
+ }
+ }
+ return count;
+}
+
+static int h5_timed_event(unsigned long arg)
+{
+ struct hci_uart *hu = (struct hci_uart *) arg;
+ struct h5_struct *h5 = hu->priv;
+ struct sk_buff *skb;
+ unsigned long flags;
+
+ BT_DBG("hu %p retransmitting %u pkts\n", 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_struct *h5;
+
+ BT_DBG("hu %p\n", hu);
+
+ h5 = kzalloc(sizeof(*h5), GFP_ATOMIC);
+ if (!h5)
+ return -ENOMEM;
+
+ hu->priv = h5;
+ skb_queue_head_init(&h5->unack);
+ skb_queue_head_init(&h5->rel);
+ skb_queue_head_init(&h5->unrel);
+
+ init_timer(&h5->th5);
+ h5->th5.function = h5_timed_event;
+ h5->th5.data = (u_long) hu;
+
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+
+ if (h5txcrc)
+ h5->use_crc = 1;
+
+ return 0;
+}
+
+static int h5_close(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ hu->priv = NULL;
+
+ BT_DBG("hu %p\n", hu);
+
+ skb_queue_purge(&h5->unack);
+ skb_queue_purge(&h5->rel);
+ skb_queue_purge(&h5->unrel);
+ del_timer(&h5->th5);
+
+ kfree(h5);
+ return 0;
+}
+
+static struct hci_uart_proto h5 = {
+ .id = HCI_UART_H5,
+ .open = h5_open,
+ .close = h5_close,
+ .enqueue = h5_enqueue,
+ .dequeue = h5_dequeue,
+ .recv = h5_recv,
+ .flush = h5_flush
+};
+
+int h5_init(void)
+{
+ int err = hci_uart_register_proto(&h5);
+
+ if (!err)
+ BT_INFO("HCI H5 protocol initialized");
+ else
+ BT_ERR("HCI H5 protocol registration failed");
+
+ return err;
+}
+
+int h5_deinit(void)
+{
+ return hci_uart_unregister_proto(&h5);
+}
+
+module_param(h5txcrc, bool, 0644);
+MODULE_PARM_DESC(h5txcrc, "Transmit CRC with every H5 packet");
+
+module_param(h5extn, bool, 0644);
+MODULE_PARM_DESC(h5extn, "Convert HCI Extensions into H5 packets");
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 283b127..8099d9e 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -47,6 +47,8 @@
#include "hci_uart.h"

#define VERSION "2.2"
+#undef BT_DBG
+#define BT_DBG printk

static int reset = 0;

@@ -123,13 +125,14 @@ int hci_uart_tx_wakeup(struct hci_uart *hu)
struct tty_struct *tty = hu->tty;
struct hci_dev *hdev = hu->hdev;
struct sk_buff *skb;
+ int i;

if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
return 0;
}

- BT_DBG("");
+ BT_DBG("\n");

restart:
clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
@@ -138,6 +141,7 @@ restart:
int len;

set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+
len = tty->ops->write(tty, skb->data, skb->len);
hdev->stat.byte_tx += len;

@@ -162,7 +166,7 @@ restart:
/* Initialize device */
static int hci_uart_open(struct hci_dev *hdev)
{
- BT_DBG("%s %p", hdev->name, hdev);
+ BT_DBG("%s %p\n", hdev->name, hdev);

/* Nothing to do for UART driver */

@@ -177,7 +181,7 @@ static int hci_uart_flush(struct hci_dev *hdev)
struct hci_uart *hu = (struct hci_uart *) hdev->driver_data;
struct tty_struct *tty = hu->tty;

- BT_DBG("hdev %p tty %p", hdev, tty);
+ BT_DBG("hdev %p tty %p\n", hdev, tty);

if (hu->tx_skb) {
kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
@@ -196,7 +200,7 @@ static int hci_uart_flush(struct hci_dev *hdev)
/* Close device */
static int hci_uart_close(struct hci_dev *hdev)
{
- BT_DBG("hdev %p", hdev);
+ BT_DBG("hdev %p\n", hdev);

if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
return 0;
@@ -224,7 +228,7 @@ static int hci_uart_send_frame(struct sk_buff *skb)
hu = (struct hci_uart *) hdev->driver_data;
tty = hu->tty;

- BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
+ BT_DBG("%s: type %d len %d\n", hdev->name, bt_cb(skb)->pkt_type, skb->len);

hu->proto->enqueue(hu, skb);

@@ -238,7 +242,7 @@ static void hci_uart_destruct(struct hci_dev *hdev)
if (!hdev)
return;

- BT_DBG("%s", hdev->name);
+ BT_DBG("%s\n", hdev->name);
kfree(hdev->driver_data);
}

@@ -256,7 +260,7 @@ static int hci_uart_tty_open(struct tty_struct *tty)
{
struct hci_uart *hu = (void *) tty->disc_data;

- BT_DBG("tty %p", tty);
+ BT_DBG("tty %p\n", tty);

/* FIXME: This btw is bogus, nothing requires the old ldisc to clear
the pointer */
@@ -300,7 +304,7 @@ static void hci_uart_tty_close(struct tty_struct *tty)
{
struct hci_uart *hu = (void *)tty->disc_data;

- BT_DBG("tty %p", tty);
+ BT_DBG("tty %p\n", tty);

/* Detach from the tty */
tty->disc_data = NULL;
@@ -331,7 +335,7 @@ static void hci_uart_tty_wakeup(struct tty_struct *tty)
{
struct hci_uart *hu = (void *)tty->disc_data;

- BT_DBG("");
+ BT_DBG("\n");

if (!hu)
return;
@@ -379,7 +383,7 @@ static int hci_uart_register_dev(struct hci_uart *hu)
{
struct hci_dev *hdev;

- BT_DBG("");
+ BT_DBG("\n");

/* Initialize and register HCI device */
hdev = hci_alloc_dev();
@@ -456,7 +460,7 @@ static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
struct hci_uart *hu = (void *)tty->disc_data;
int err = 0;

- BT_DBG("");
+ BT_DBG("\n");

/* Verify the status of the device */
if (!hu)
@@ -549,6 +553,9 @@ static int __init hci_uart_init(void)
#ifdef CONFIG_BT_HCIUART_LL
ll_init();
#endif
+#ifdef CONFIG_BT_HCIUART_H5
+ h5_init();
+#endif

return 0;
}
@@ -566,6 +573,9 @@ static void __exit hci_uart_exit(void)
#ifdef CONFIG_BT_HCIUART_LL
ll_deinit();
#endif
+#ifdef CONFIG_BT_HCIUART_H5
+ h5_deinit();
+#endif

/* Release tty registration of line discipline */
if ((err = tty_unregister_ldisc(N_HCI)))
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index 50113db..0c40dab 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -33,13 +33,14 @@
#define HCIUARTGETDEVICE _IOR('U', 202, int)

/* UART protocols */
-#define HCI_UART_MAX_PROTO 5
+#define HCI_UART_MAX_PROTO 6

#define HCI_UART_H4 0
#define HCI_UART_BCSP 1
#define HCI_UART_3WIRE 2
#define HCI_UART_H4DS 3
#define HCI_UART_LL 4
+#define HCI_UART_H5 5

struct hci_uart;

@@ -91,3 +92,8 @@ int bcsp_deinit(void);
int ll_init(void);
int ll_deinit(void);
#endif
+
+#ifdef CONFIG_BT_HCIUART_H5
+int h5_init(void);
+int h5_deinit(void);
+#endif
--
1.7.1

From d2d680c57f9e09cc574faf0c4153aacc007035bd Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Thu, 11 Aug 2011 10:55:02 -0700
Subject: [PATCH 02/10] add flow control escape characters

---
drivers/bluetooth/hci_h5.c | 18 +++++++++---------
1 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index e2a1f69..a2a97cc 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -434,9 +434,10 @@ static void h5_handle_le_pkt(struct hci_uart *hu)
}
}

+
static inline void h5_unslip_one_byte(struct h5_struct *h5, unsigned char byte)
{
- const u8 c0 = 0xc0, db = 0xdb;
+ const u8 c0 = 0xc0, db = 0xdb, oneone = 0x11, onethree = 0x13;

switch (h5->rx_esc_state) {
case H5_ESCSTATE_NOESC:
@@ -473,20 +474,20 @@ static inline void h5_unslip_one_byte(struct h5_struct *h5, unsigned char byte)
h5->rx_count--;
break;

- case 0xdf:
- memcpy(skb_put(h5->rx_skb, 1), &db, 1);
+ case 0xde:
+ memcpy(skb_put(h5->rx_skb, 1), &oneone, 1);
if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
h5->rx_state != H5_W4_CRC)
- h5_crc_update(&h5-> message_crc, 0x13);
+ h5_crc_update(&h5-> message_crc, 0x11);
h5->rx_esc_state = H5_ESCSTATE_NOESC;
h5->rx_count--;
break;

- case 0xde:
- memcpy(skb_put(h5->rx_skb, 1), &db, 1);
+ case 0xdf:
+ memcpy(skb_put(h5->rx_skb, 1), &onethree, 1);
if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
h5->rx_state != H5_W4_CRC)
- h5_crc_update(&h5-> message_crc, 0x11);
+ h5_crc_update(&h5-> message_crc, 0x13);
h5->rx_esc_state = H5_ESCSTATE_NOESC;
h5->rx_count--;
break;
@@ -577,7 +578,7 @@ static void h5_complete_rx_pkt(struct hci_uart *hu)

static u16 h5_get_crc(struct h5_struct *h5)
{
- return get_unaligned_be16(&h5->rx_skb->data[h5->rx_skb->len - 2]);
+ return(get_unaligned_be16(&h5->rx_skb->data[h5->rx_skb->len - 2]));
}

/* Recv data */
@@ -668,7 +669,6 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
h5->rx_count = 0;
continue;
}
-
skb_trim(h5->rx_skb, h5->rx_skb->len - 2);
h5_complete_rx_pkt(hu);
h5->rx_state = H5_W4_PKT_DELIMITER;
--
1.7.1

From 07e40bafb21cc61c59dac90a308639f18487d00f Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Thu, 11 Aug 2011 11:12:03 -0700
Subject: [PATCH 03/10] add flow control escape characters for tx

---
drivers/bluetooth/hci_h5.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index a2a97cc..0168269 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -139,6 +139,8 @@ static void h5_slip_one_byte(struct sk_buff *skb, u8 c)
{
const char esc_c0[2] = { 0xdb, 0xdc };
const char esc_db[2] = { 0xdb, 0xdd };
+ const char esc_oneone[2] = { 0xdb, 0xde };
+ const char esc_onethree[2] = { 0xdb, 0xdf };

switch (c) {
case 0xc0:
@@ -147,6 +149,12 @@ static void h5_slip_one_byte(struct sk_buff *skb, u8 c)
case 0xdb:
memcpy(skb_put(skb, 2), &esc_db, 2);
break;
+ case 0x11:
+ memcpy(skb_put(skb, 2), &esc_oneone, 2);
+ break;
+ case 0x13:
+ memcpy(skb_put(skb, 2), &esc_onethree, 2);
+ break;
default:
memcpy(skb_put(skb, 1), &c, 1);
}
--
1.7.1

From c42f8bb513986054504e5c122a0f7597066dc15b Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Wed, 17 Aug 2011 15:12:17 -0700
Subject: [PATCH 04/10] added sleep mode

---
drivers/bluetooth/hci_h5.c | 101 +++++++++++++++++++++++++++++++++++---------
1 files changed, 81 insertions(+), 20 deletions(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 0168269..265a9c5 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -61,6 +61,10 @@ static int h5extn = 1;
#define H5_ACK_PKT 0x00
#define H5_LE_PKT 0x0f

+static u8 h5_wakeup_msg[] = { 0x05, 0xfa };
+static u8 h5_woken_msg[] = { 0x06, 0xf9 };
+static u8 h5_sleep_msg[] = { 0x07, 0x78 };
+
struct h5_struct {
struct sk_buff_head unack; /* Unack'ed packets queue */
struct sk_buff_head rel; /* Reliable packets queue */
@@ -92,8 +96,53 @@ struct h5_struct {

/* Reliable packet sequence number - used to assign seq to each rel pkt. */
u8 msgq_txseq;
+
+ u8 sleep_state;
+ u8 is_there_activity;
+ u16 inactive_period;
+};
+
+enum sleep_states {
+ H5_ASLEEP,
+ H5_ASLEEP_TO_AWAKE,
+ H5_AWAKE,
+ H5_AWAKE_TO_ASLEEP
};

+#define TIMER_PERIOD 100
+#define HOST_CONTROLLER_IDLE_THRSH 4000
+
+static struct timer_list sleep_timer;
+
+extern struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
+ int len, int pkt_type);
+
+//
+// Timeout Handler
+//
+
+void sleep_timer_function(unsigned long data)
+{
+ struct h5_struct *lh5 = (struct h5_struct *)data;
+
+ if (lh5->is_there_activity) {
+ lh5->is_there_activity = 0;
+ lh5->inactive_period = 0;
+ } else if (lh5->sleep_state != H5_ASLEEP) {
+ lh5->inactive_period += TIMER_PERIOD;
+
+ if (lh5->inactive_period >= HOST_CONTROLLER_IDLE_THRSH) {
+ BT_DBG("moves to ASLEEP");
+ lh5->sleep_state = H5_ASLEEP;
+ lh5->inactive_period = 0;
+ struct sk_buff *nskb = h5_prepare_pkt(lh5, h5_sleep_msg, sizeof(h5_sleep_msg), 15);
+ skb_queue_tail(&lh5->unrel, nskb);
+ }
+ }
+
+ mod_timer(&sleep_timer, jiffies + TIMER_PERIOD * HZ / 1000);
+}
+
/* ---- H5 CRC calculation ---- */

/* Table for calculating CRC for polynomial 0x1021, LSB processed first,
@@ -170,6 +219,14 @@ static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
return 0;
}

+ h5->is_there_activity = 1;
+
+ if (h5->sleep_state == H5_ASLEEP) {
+ struct sk_buff *nskb = h5_prepare_pkt(h5, h5_wakeup_msg, sizeof(h5_wakeup_msg), 15);
+ skb_queue_tail(&h5->unrel, skb);
+ h5->sleep_state = H5_AWAKE;
+ }
+
switch (bt_cb(skb)->pkt_type) {
case HCI_ACLDATA_PKT:
case HCI_COMMAND_PKT:
@@ -189,7 +246,7 @@ static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
return 0;
}

-static struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
+struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
int len, int pkt_type)
{
struct sk_buff *nskb;
@@ -357,6 +414,7 @@ static struct sk_buff *h5_dequeue(struct hci_uart *hu)
static int h5_flush(struct hci_uart *hu)
{
BT_DBG("hu %p\n", hu);
+ del_timer_sync(&sleep_timer);
return 0;
}

@@ -417,28 +475,22 @@ static void h5_pkt_cull(struct h5_struct *h5)
static void h5_handle_le_pkt(struct hci_uart *hu)
{
struct h5_struct *h5 = hu->priv;
- u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed };
- u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 };
- u8 sync_pkt[4] = { 0x00, 0xd0, 0x01, 0x7e };
-
- /* spot "conf" pkts and reply with a "conf rsp" pkt */
- if (h5->rx_skb->data[1] >> 4 == 4 && h5->rx_skb->data[2] == 0 &&
- !memcmp(&h5->rx_skb->data[4], conf_pkt, 4)) {
- struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC);
-
- BT_DBG("Found a LE conf pkt\n");
- if (!nskb)
- return;
- memcpy(skb_put(nskb, 4), conf_rsp_pkt, 4);
- bt_cb(nskb)->pkt_type = H5_LE_PKT;
+ u8 wakeup_pkt[] = { 0x05, 0xfa };
+ u8 woken_pkt[] = { 0x06, 0xf9 };
+
+ struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC);
+
+ BT_DBG("Found a LE pkt\n");

+ if (!nskb)
+ return;
+
+ if (!memcmp(&h5->rx_skb->data[4], wakeup_pkt, 2)) {
+ memcpy(skb_put(nskb, 2), woken_pkt, 2);
+ bt_cb(nskb)->pkt_type = H5_LE_PKT;
skb_queue_head(&h5->unrel, nskb);
hci_uart_tx_wakeup(hu);
- }
- /* Spot "sync" pkts. If we find one...disaster! */
- else if (h5->rx_skb->data[1] >> 4 == 4 && h5->rx_skb->data[2] == 0 &&
- !memcmp(&h5->rx_skb->data[4], sync_pkt, 4)) {
- BT_ERR("Found a LE sync pkt, card has reset");
+ } else if (!memcmp(&h5->rx_skb->data[4], woken_pkt, 2)) {
}
}

@@ -772,6 +824,15 @@ static int h5_open(struct hci_uart *hu)
if (h5txcrc)
h5->use_crc = 1;

+ init_timer(&sleep_timer);
+
+ sleep_timer.expires = jiffies + TIMER_PERIOD * HZ / 1000;
+ sleep_timer.data = (unsigned long)h5;
+ sleep_timer.function = sleep_timer_function;
+
+ add_timer(&sleep_timer);
+ h5->is_there_activity = 0;
+
return 0;
}

--
1.7.1

From f9915f77dfbcb703ca098a7a0ace91fab3f686e8 Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Mon, 22 Aug 2011 11:42:10 -0700
Subject: [PATCH 05/10] fixed seqno issues

---
drivers/bluetooth/hci_h5.c | 113 +++++++++++---------------------------------
1 files changed, 28 insertions(+), 85 deletions(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 265a9c5..88ad715 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -61,10 +61,6 @@ static int h5extn = 1;
#define H5_ACK_PKT 0x00
#define H5_LE_PKT 0x0f

-static u8 h5_wakeup_msg[] = { 0x05, 0xfa };
-static u8 h5_woken_msg[] = { 0x06, 0xf9 };
-static u8 h5_sleep_msg[] = { 0x07, 0x78 };
-
struct h5_struct {
struct sk_buff_head unack; /* Unack'ed packets queue */
struct sk_buff_head rel; /* Reliable packets queue */
@@ -96,53 +92,8 @@ struct h5_struct {

/* Reliable packet sequence number - used to assign seq to each rel pkt. */
u8 msgq_txseq;
-
- u8 sleep_state;
- u8 is_there_activity;
- u16 inactive_period;
-};
-
-enum sleep_states {
- H5_ASLEEP,
- H5_ASLEEP_TO_AWAKE,
- H5_AWAKE,
- H5_AWAKE_TO_ASLEEP
};

-#define TIMER_PERIOD 100
-#define HOST_CONTROLLER_IDLE_THRSH 4000
-
-static struct timer_list sleep_timer;
-
-extern struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
- int len, int pkt_type);
-
-//
-// Timeout Handler
-//
-
-void sleep_timer_function(unsigned long data)
-{
- struct h5_struct *lh5 = (struct h5_struct *)data;
-
- if (lh5->is_there_activity) {
- lh5->is_there_activity = 0;
- lh5->inactive_period = 0;
- } else if (lh5->sleep_state != H5_ASLEEP) {
- lh5->inactive_period += TIMER_PERIOD;
-
- if (lh5->inactive_period >= HOST_CONTROLLER_IDLE_THRSH) {
- BT_DBG("moves to ASLEEP");
- lh5->sleep_state = H5_ASLEEP;
- lh5->inactive_period = 0;
- struct sk_buff *nskb = h5_prepare_pkt(lh5, h5_sleep_msg, sizeof(h5_sleep_msg), 15);
- skb_queue_tail(&lh5->unrel, nskb);
- }
- }
-
- mod_timer(&sleep_timer, jiffies + TIMER_PERIOD * HZ / 1000);
-}
-
/* ---- H5 CRC calculation ---- */

/* Table for calculating CRC for polynomial 0x1021, LSB processed first,
@@ -219,14 +170,6 @@ static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
return 0;
}

- h5->is_there_activity = 1;
-
- if (h5->sleep_state == H5_ASLEEP) {
- struct sk_buff *nskb = h5_prepare_pkt(h5, h5_wakeup_msg, sizeof(h5_wakeup_msg), 15);
- skb_queue_tail(&h5->unrel, skb);
- h5->sleep_state = H5_AWAKE;
- }
-
switch (bt_cb(skb)->pkt_type) {
case HCI_ACLDATA_PKT:
case HCI_COMMAND_PKT:
@@ -246,7 +189,7 @@ static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
return 0;
}

-struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
+static struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
int len, int pkt_type)
{
struct sk_buff *nskb;
@@ -315,6 +258,7 @@ struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
if (rel) {
hdr[0] |= 0x80 + h5->msgq_txseq;
BT_DBG("Sending packet with seqno %u\n", h5->msgq_txseq);
+ h5->msgq_txseq = (h5->msgq_txseq + 1) & 0x07;
}

if (h5->use_crc)
@@ -414,7 +358,6 @@ static struct sk_buff *h5_dequeue(struct hci_uart *hu)
static int h5_flush(struct hci_uart *hu)
{
BT_DBG("hu %p\n", hu);
- del_timer_sync(&sleep_timer);
return 0;
}

@@ -430,20 +373,23 @@ static void h5_pkt_cull(struct h5_struct *h5)

pkts_to_be_removed = skb_queue_len(&h5->unack);

+ printk("%s: unack len %d\n", pkts_to_be_removed);
+
seqno = h5->msgq_txseq;

while (pkts_to_be_removed) {
- if (((h5->rxack - 1) & 0x07) == seqno)
+ printk("ack %d seq %d\n", h5->rxack, seqno);
+ if (h5->rxack == seqno)
break;

pkts_to_be_removed--;
- seqno = (seqno + 1) & 0x07;
+ seqno = (seqno - 1) & 0x07;
}

-/*
+ printk("seqno now %d\n", seqno);
+
if (h5->rxack != seqno)
BT_ERR("Peer acked invalid packet");
-*/

BT_DBG("Removing %u pkts out of %u, up to seqno %u\n",
pkts_to_be_removed, skb_queue_len(&h5->unack),
@@ -475,22 +421,28 @@ static void h5_pkt_cull(struct h5_struct *h5)
static void h5_handle_le_pkt(struct hci_uart *hu)
{
struct h5_struct *h5 = hu->priv;
- u8 wakeup_pkt[] = { 0x05, 0xfa };
- u8 woken_pkt[] = { 0x06, 0xf9 };
-
- struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC);
-
- BT_DBG("Found a LE pkt\n");
-
- if (!nskb)
- return;
-
- if (!memcmp(&h5->rx_skb->data[4], wakeup_pkt, 2)) {
- memcpy(skb_put(nskb, 2), woken_pkt, 2);
+ u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed };
+ u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 };
+ u8 sync_pkt[4] = { 0x00, 0xd0, 0x01, 0x7e };
+
+ /* spot "conf" pkts and reply with a "conf rsp" pkt */
+ if (h5->rx_skb->data[1] >> 4 == 4 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], conf_pkt, 4)) {
+ struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC);
+
+ BT_DBG("Found a LE conf pkt\n");
+ if (!nskb)
+ return;
+ memcpy(skb_put(nskb, 4), conf_rsp_pkt, 4);
bt_cb(nskb)->pkt_type = H5_LE_PKT;
+
skb_queue_head(&h5->unrel, nskb);
hci_uart_tx_wakeup(hu);
- } else if (!memcmp(&h5->rx_skb->data[4], woken_pkt, 2)) {
+ }
+ /* Spot "sync" pkts. If we find one...disaster! */
+ else if (h5->rx_skb->data[1] >> 4 == 4 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], sync_pkt, 4)) {
+ BT_ERR("Found a LE sync pkt, card has reset");
}
}

@@ -824,15 +776,6 @@ static int h5_open(struct hci_uart *hu)
if (h5txcrc)
h5->use_crc = 1;

- init_timer(&sleep_timer);
-
- sleep_timer.expires = jiffies + TIMER_PERIOD * HZ / 1000;
- sleep_timer.data = (unsigned long)h5;
- sleep_timer.function = sleep_timer_function;
-
- add_timer(&sleep_timer);
- h5->is_there_activity = 0;
-
return 0;
}

--
1.7.1

From e0eae63d62db4365130df405bdc3ede6b153008b Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Mon, 12 Sep 2011 11:05:15 -0700
Subject: [PATCH 06/10] send VSC over packet type 01 instead of packet type 14

---
drivers/bluetooth/hci_h5.c | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 88ad715..a661ff3 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -197,6 +197,7 @@ static struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
u16 H5_CRC_INIT(h5_txmsg_crc);
int rel, i;

+ printk("%s pkt_type %d\n", __func__, pkt_type);
print_hex_dump_bytes("h5_prepare_pkt ", DUMP_PREFIX_NONE, data, len);

switch (pkt_type) {
@@ -225,11 +226,13 @@ static struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
return NULL;
}

- if (h5extn && chan == 14) {
+ if (h5extn && chan == 1) {
__le16 opcode = ((struct hci_command_hdr *)data)->opcode;

/* Vendor specific commands */
if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) {
+ chan = 1;
+
u8 desc = *(data + HCI_COMMAND_HDR_SIZE);
if ((desc & 0xf0) == 0xc0) {
data += HCI_COMMAND_HDR_SIZE + 1;
@@ -608,6 +611,8 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
ptr = data;

while (count) {
+ // printk("while count %d rx_count %d\n", count, h5->rx_count);
+
if (h5->rx_count) {
if (*ptr == 0xc0) {
BT_ERR("Short H5 packet");
@@ -621,6 +626,8 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
continue;
}

+ // printk("switch state %d\n", h5->rx_state);
+
switch (h5->rx_state) {
case H5_W4_H5_HDR:
if ((0xff & (u8) ~ (h5->rx_skb->data[0] + h5->rx_skb->data[1] +
--
1.7.1

From 428d90aef9bca3d50fe273f5f3d8864605bf5e3b Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Fri, 23 Sep 2011 13:01:30 -0700
Subject: [PATCH 07/10] remove DEBUG for open source release

---
drivers/bluetooth/hci_h5.c | 49 +++++++++++++++++++++++++++++++++++---------
1 files changed, 39 insertions(+), 10 deletions(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index a661ff3..7a40565 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -77,7 +77,6 @@ struct h5_struct {
H5_W4_PKT_START,
H5_W4_H5_HDR,
H5_W4_DATA,
- H5_W4_CRC1,
H5_W4_CRC
} rx_state;

@@ -197,8 +196,10 @@ static struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
u16 H5_CRC_INIT(h5_txmsg_crc);
int rel, i;

+#ifdef DEBUG
printk("%s pkt_type %d\n", __func__, pkt_type);
print_hex_dump_bytes("h5_prepare_pkt ", DUMP_PREFIX_NONE, data, len);
+#endif

switch (pkt_type) {
case HCI_ACLDATA_PKT:
@@ -376,12 +377,16 @@ static void h5_pkt_cull(struct h5_struct *h5)

pkts_to_be_removed = skb_queue_len(&h5->unack);

+#ifdef DEBUG
printk("%s: unack len %d\n", pkts_to_be_removed);
+#endif

seqno = h5->msgq_txseq;

while (pkts_to_be_removed) {
+#ifdef DEBUG
printk("ack %d seq %d\n", h5->rxack, seqno);
+#endif
if (h5->rxack == seqno)
break;

@@ -389,7 +394,9 @@ static void h5_pkt_cull(struct h5_struct *h5)
seqno = (seqno - 1) & 0x07;
}

+#ifdef DEBUG
printk("seqno now %d\n", seqno);
+#endif

if (h5->rxack != seqno)
BT_ERR("Peer acked invalid packet");
@@ -529,7 +536,7 @@ static void h5_complete_rx_pkt(struct hci_uart *hu)
h5->txack_req = 1;

/* If needed, transmit an ack pkt */
- hci_uart_tx_wakeup(hu);
+ // hci_uart_tx_wakeup(hu); // wait till end of buffer
}

h5->rxack = (h5->rx_skb->data[0] >> 3) & 0x07;
@@ -611,11 +618,17 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
ptr = data;

while (count) {
- // printk("while count %d rx_count %d\n", count, h5->rx_count);
+#ifdef DEBUG
+ printk("while count %d rx_count %d\n", count, h5->rx_count);
+#endif

if (h5->rx_count) {
if (*ptr == 0xc0) {
BT_ERR("Short H5 packet");
+#ifdef DEBUG
+ printk("Short H5 %02x count %d rx_count %d state %d\n",
+ *ptr, count, h5->rx_count, h5->rx_state);
+#endif
kfree_skb(h5->rx_skb);
h5->rx_state = H5_W4_PKT_START;
h5->rx_count = 0;
@@ -626,7 +639,9 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
continue;
}

- // printk("switch state %d\n", h5->rx_state);
+#ifdef DEBUG
+ printk("switch state %d\n", h5->rx_state);
+#endif

switch (h5->rx_state) {
case H5_W4_H5_HDR:
@@ -641,9 +656,11 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)


if (h5->rx_skb->data[0] & 0x80) { /* reliable pkt */
+#ifdef DEBUG
printk("%0x != %0x ? %d\n", h5->rx_skb->data[0] & 0x07,
h5->rxseq_txack,
(h5->rx_skb->data[0] & 0x07) != h5->rxseq_txack);
+#endif

if ((h5->rx_skb->data[0] & 0x07) != h5->rxseq_txack) {
BT_ERR ("Out-of-order packet arrived, got %u expected %u",
@@ -672,11 +689,6 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)

continue;

- case H5_W4_CRC1:
- h5->rx_state = H5_W4_CRC;
- count--;
- continue;
-
case H5_W4_CRC:
if (bitrev16(h5->message_crc) != h5_get_crc(h5)) {
BT_ERR ("Checksum failed: computed %04x received %04x",
@@ -689,6 +701,7 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
continue;
}
skb_trim(h5->rx_skb, h5->rx_skb->len - 2);
+
h5_complete_rx_pkt(hu);
h5->rx_state = H5_W4_PKT_DELIMITER;
count--;
@@ -699,8 +712,13 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
case 0xc0:
h5->rx_state = H5_W4_PKT_START;
break;
+
+ case 0x11:
+ // hci_uart_tx_wakeup(hu);
+ break;
+
default:
- /*BT_ERR("Ignoring byte %02x", *ptr);*/
+ BT_ERR("Ignoring byte %02x", *ptr);
break;
}
ptr++; count--;
@@ -712,6 +730,11 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
ptr++; count--;
break;

+ case 0x11:
+ // hci_uart_tx_wakeup(hu);
+ ptr++; count--;
+ break;
+
default:
h5->rx_state = H5_W4_H5_HDR;
h5->rx_count = 4;
@@ -735,6 +758,12 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
break;
}
}
+
+ if (h5->txack_req) {
+ /* If needed, transmit an ack pkt */
+ hci_uart_tx_wakeup(hu);
+ }
+
return count;
}

--
1.7.1

From c408f919e96cc8ec51956377b1ed1777b21f5885 Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Fri, 30 Sep 2011 13:42:25 -0700
Subject: [PATCH 08/10] change license per Matt Sant

---
drivers/bluetooth/hci_h5.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 7a40565..957dc3e 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -1,4 +1,22 @@
/*
+ * Copyright 2011 Broadcom Corporation
+ *
+ * This software is licensed to you under the terms of the GNU General
+ * Public License version 2 (the "GPL"), available at
+ * http://www.broadcom.com/licenses/GPLv2.php.
+ *
+ * This software is based upon Bluetooth HCI UART driver, which was developed
+ * by Fabrizio Gennari <fabrizio.gennari@philips.com> (Copyright (C) 2002-2003)
+ * and Marcel Holtmann <marcel@holtmann.org> (Copyright (C) 2004-2005).
+ * The original Bluetooth HCI UART driver is available here: http://www.kernel.org
+ *
+ * This software is distributed WITHOUT ANY WARRANTY; including the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *
+ */
+
+/*
*
* Bluetooth HCI UART driver
*
--
1.7.1

From 08a6798ee23088a66ec01befece7ec08b7bac14f Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Mon, 3 Oct 2011 12:40:04 -0700
Subject: [PATCH 09/10] fix count error on multiple packets in one buffer

---
drivers/bluetooth/hci_h5.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 957dc3e..d629d2b 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -637,7 +637,8 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)

while (count) {
#ifdef DEBUG
- printk("while count %d rx_count %d\n", count, h5->rx_count);
+ printk("while count %d rx_count %d ptr %02x state %d\n", count,
+ h5->rx_count, *ptr, h5->rx_state);
#endif

if (h5->rx_count) {
@@ -722,7 +723,6 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)

h5_complete_rx_pkt(hu);
h5->rx_state = H5_W4_PKT_DELIMITER;
- count--;
continue;

case H5_W4_PKT_DELIMITER:
@@ -777,6 +777,9 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
}
}

+ printk("leaving h5_recv rx_state %d rx_count %d ptr %02x\n", h5->rx_state,
+ h5->rx_count, *ptr);
+
if (h5->txack_req) {
/* If needed, transmit an ack pkt */
hci_uart_tx_wakeup(hu);
--
1.7.1

From 2658d101fd3925ed293b30b8f0910561ba12d21a Mon Sep 17 00:00:00 2001
From: Mark P. Mendelsohn <mpm>
Date: Mon, 24 Oct 2011 09:57:04 -0700
Subject: [PATCH 10/10] conditional compile debug statements

---
drivers/bluetooth/hci_h5.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index d629d2b..2effe06 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -317,7 +317,10 @@ static struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,

h5_slip_msgdelim(nskb);

+#ifdef DEBUG
print_hex_dump_bytes("h5_tx ", DUMP_PREFIX_NONE, nskb->data, nskb->len);
+#endif
+
return nskb;
}

@@ -631,7 +634,9 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
BT_DBG("hu %p count %d rx_state %d rx_count %ld\n",
hu, count, h5->rx_state, h5->rx_count);

+#ifdef DEBUG
print_hex_dump_bytes("h5_recv ", DUMP_PREFIX_NONE, data, count);
+#endif

ptr = data;

@@ -777,8 +782,10 @@ static int h5_recv(struct hci_uart *hu, void *data, int count)
}
}

+#ifdef DEBUG
printk("leaving h5_recv rx_state %d rx_count %d ptr %02x\n", h5->rx_state,
h5->rx_count, *ptr);
+#endif

if (h5->txack_req) {
/* If needed, transmit an ack pkt */
--
1.7.1


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