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/*
*
* Bluetooth HCI UART driver
*
* Copyright (C) 2000-2001 Qualcomm Incorporated
* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.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 <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "hci_uart.h"
#define VERSION "1.2"
struct h4_struct {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
};
/* Initialize protocol */
static int h4_open(struct hci_uart *hu)
{
struct h4_struct *h4;
BT_DBG("hu %p", hu);
h4 = kzalloc(sizeof(*h4), GFP_KERNEL);
if (!h4)
return -ENOMEM;
skb_queue_head_init(&h4->txq);
hu->priv = h4;
return 0;
}
/* Flush protocol data */
static int h4_flush(struct hci_uart *hu)
{
struct h4_struct *h4 = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&h4->txq);
return 0;
}
/* Close protocol */
static int h4_close(struct hci_uart *hu)
{
struct h4_struct *h4 = hu->priv;
hu->priv = NULL;
BT_DBG("hu %p", hu);
skb_queue_purge(&h4->txq);
kfree_skb(h4->rx_skb);
hu->priv = NULL;
kfree(h4);
return 0;
}
/* Enqueue frame for transmittion (padding, crc, etc) */
static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
struct h4_struct *h4 = hu->priv;
BT_DBG("hu %p skb %p", hu, skb);
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
skb_queue_tail(&h4->txq, skb);
return 0;
}
/* Recv data */
static int h4_recv(struct hci_uart *hu, const void *data, int count)
{
struct h4_struct *h4 = hu->priv;
if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
return -EUNATCH;
h4->rx_skb = h4_recv_buf(hu->hdev, h4->rx_skb, data, count);
if (IS_ERR(h4->rx_skb)) {
int err = PTR_ERR(h4->rx_skb);
BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
return err;
}
return count;
}
static struct sk_buff *h4_dequeue(struct hci_uart *hu)
{
struct h4_struct *h4 = hu->priv;
return skb_dequeue(&h4->txq);
}
static const struct hci_uart_proto h4p = {
.id = HCI_UART_H4,
.open = h4_open,
.close = h4_close,
.recv = h4_recv,
.enqueue = h4_enqueue,
.dequeue = h4_dequeue,
.flush = h4_flush,
};
int __init h4_init(void)
{
int err = hci_uart_register_proto(&h4p);
if (!err)
BT_INFO("HCI H4 protocol initialized");
else
BT_ERR("HCI H4 protocol registration failed");
return err;
}
int __exit h4_deinit(void)
{
return hci_uart_unregister_proto(&h4p);
}
struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
const unsigned char *buffer, int count)
{
while (count) {
int len;
if (!skb) {
switch (buffer[0]) {
case HCI_ACLDATA_PKT:
skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE,
GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
bt_cb(skb)->expect = HCI_ACL_HDR_SIZE;
break;
case HCI_SCODATA_PKT:
skb = bt_skb_alloc(HCI_MAX_SCO_SIZE,
GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
bt_cb(skb)->expect = HCI_SCO_HDR_SIZE;
break;
case HCI_EVENT_PKT:
skb = bt_skb_alloc(HCI_MAX_EVENT_SIZE,
GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
bt_cb(skb)->expect = HCI_EVENT_HDR_SIZE;
break;
default:
return ERR_PTR(-EILSEQ);
}
count -= 1;
buffer += 1;
}
len = min_t(uint, bt_cb(skb)->expect, count);
memcpy(skb_put(skb, len), buffer, len);
count -= len;
buffer += len;
bt_cb(skb)->expect -= len;
switch (bt_cb(skb)->pkt_type) {
case HCI_ACLDATA_PKT:
if (skb->len == HCI_ACL_HDR_SIZE) {
__le16 dlen = hci_acl_hdr(skb)->dlen;
/* Complete ACL header */
bt_cb(skb)->expect = __le16_to_cpu(dlen);
if (skb_tailroom(skb) < bt_cb(skb)->expect) {
kfree_skb(skb);
return ERR_PTR(-EMSGSIZE);
}
}
break;
case HCI_SCODATA_PKT:
if (skb->len == HCI_SCO_HDR_SIZE) {
/* Complete SCO header */
bt_cb(skb)->expect = hci_sco_hdr(skb)->dlen;
if (skb_tailroom(skb) < bt_cb(skb)->expect) {
kfree_skb(skb);
return ERR_PTR(-EMSGSIZE);
}
}
break;
case HCI_EVENT_PKT:
if (skb->len == HCI_EVENT_HDR_SIZE) {
/* Complete event header */
bt_cb(skb)->expect = hci_event_hdr(skb)->plen;
if (skb_tailroom(skb) < bt_cb(skb)->expect) {
kfree_skb(skb);
return ERR_PTR(-EMSGSIZE);
}
}
break;
}
if (bt_cb(skb)->expect == 0) {
/* Complete frame */
hci_recv_frame(hdev, skb);
skb = NULL;
}
}
return skb;
}
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