forked from luck/tmp_suning_uos_patched
6ab3d5624e
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
298 lines
6.1 KiB
C
298 lines
6.1 KiB
C
/*
|
|
*
|
|
* 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/sched.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"
|
|
|
|
#ifndef CONFIG_BT_HCIUART_DEBUG
|
|
#undef BT_DBG
|
|
#define BT_DBG( A... )
|
|
#endif
|
|
|
|
#define VERSION "1.2"
|
|
|
|
struct h4_struct {
|
|
unsigned long rx_state;
|
|
unsigned long rx_count;
|
|
struct sk_buff *rx_skb;
|
|
struct sk_buff_head txq;
|
|
};
|
|
|
|
/* H4 receiver States */
|
|
#define H4_W4_PACKET_TYPE 0
|
|
#define H4_W4_EVENT_HDR 1
|
|
#define H4_W4_ACL_HDR 2
|
|
#define H4_W4_SCO_HDR 3
|
|
#define H4_W4_DATA 4
|
|
|
|
/* Initialize protocol */
|
|
static int h4_open(struct hci_uart *hu)
|
|
{
|
|
struct h4_struct *h4;
|
|
|
|
BT_DBG("hu %p", hu);
|
|
|
|
h4 = kzalloc(sizeof(*h4), GFP_ATOMIC);
|
|
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);
|
|
|
|
if (h4->rx_skb)
|
|
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;
|
|
}
|
|
|
|
static inline int h4_check_data_len(struct h4_struct *h4, int len)
|
|
{
|
|
register int room = skb_tailroom(h4->rx_skb);
|
|
|
|
BT_DBG("len %d room %d", len, room);
|
|
|
|
if (!len) {
|
|
hci_recv_frame(h4->rx_skb);
|
|
} else if (len > room) {
|
|
BT_ERR("Data length is too large");
|
|
kfree_skb(h4->rx_skb);
|
|
} else {
|
|
h4->rx_state = H4_W4_DATA;
|
|
h4->rx_count = len;
|
|
return len;
|
|
}
|
|
|
|
h4->rx_state = H4_W4_PACKET_TYPE;
|
|
h4->rx_skb = NULL;
|
|
h4->rx_count = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Recv data */
|
|
static int h4_recv(struct hci_uart *hu, void *data, int count)
|
|
{
|
|
struct h4_struct *h4 = hu->priv;
|
|
register char *ptr;
|
|
struct hci_event_hdr *eh;
|
|
struct hci_acl_hdr *ah;
|
|
struct hci_sco_hdr *sh;
|
|
register int len, type, dlen;
|
|
|
|
BT_DBG("hu %p count %d rx_state %ld rx_count %ld",
|
|
hu, count, h4->rx_state, h4->rx_count);
|
|
|
|
ptr = data;
|
|
while (count) {
|
|
if (h4->rx_count) {
|
|
len = min_t(unsigned int, h4->rx_count, count);
|
|
memcpy(skb_put(h4->rx_skb, len), ptr, len);
|
|
h4->rx_count -= len; count -= len; ptr += len;
|
|
|
|
if (h4->rx_count)
|
|
continue;
|
|
|
|
switch (h4->rx_state) {
|
|
case H4_W4_DATA:
|
|
BT_DBG("Complete data");
|
|
|
|
hci_recv_frame(h4->rx_skb);
|
|
|
|
h4->rx_state = H4_W4_PACKET_TYPE;
|
|
h4->rx_skb = NULL;
|
|
continue;
|
|
|
|
case H4_W4_EVENT_HDR:
|
|
eh = (struct hci_event_hdr *) h4->rx_skb->data;
|
|
|
|
BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
|
|
|
|
h4_check_data_len(h4, eh->plen);
|
|
continue;
|
|
|
|
case H4_W4_ACL_HDR:
|
|
ah = (struct hci_acl_hdr *) h4->rx_skb->data;
|
|
dlen = __le16_to_cpu(ah->dlen);
|
|
|
|
BT_DBG("ACL header: dlen %d", dlen);
|
|
|
|
h4_check_data_len(h4, dlen);
|
|
continue;
|
|
|
|
case H4_W4_SCO_HDR:
|
|
sh = (struct hci_sco_hdr *) h4->rx_skb->data;
|
|
|
|
BT_DBG("SCO header: dlen %d", sh->dlen);
|
|
|
|
h4_check_data_len(h4, sh->dlen);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* H4_W4_PACKET_TYPE */
|
|
switch (*ptr) {
|
|
case HCI_EVENT_PKT:
|
|
BT_DBG("Event packet");
|
|
h4->rx_state = H4_W4_EVENT_HDR;
|
|
h4->rx_count = HCI_EVENT_HDR_SIZE;
|
|
type = HCI_EVENT_PKT;
|
|
break;
|
|
|
|
case HCI_ACLDATA_PKT:
|
|
BT_DBG("ACL packet");
|
|
h4->rx_state = H4_W4_ACL_HDR;
|
|
h4->rx_count = HCI_ACL_HDR_SIZE;
|
|
type = HCI_ACLDATA_PKT;
|
|
break;
|
|
|
|
case HCI_SCODATA_PKT:
|
|
BT_DBG("SCO packet");
|
|
h4->rx_state = H4_W4_SCO_HDR;
|
|
h4->rx_count = HCI_SCO_HDR_SIZE;
|
|
type = HCI_SCODATA_PKT;
|
|
break;
|
|
|
|
default:
|
|
BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
|
|
hu->hdev->stat.err_rx++;
|
|
ptr++; count--;
|
|
continue;
|
|
};
|
|
|
|
ptr++; count--;
|
|
|
|
/* Allocate packet */
|
|
h4->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
|
|
if (!h4->rx_skb) {
|
|
BT_ERR("Can't allocate mem for new packet");
|
|
h4->rx_state = H4_W4_PACKET_TYPE;
|
|
h4->rx_count = 0;
|
|
return 0;
|
|
}
|
|
|
|
h4->rx_skb->dev = (void *) hu->hdev;
|
|
bt_cb(h4->rx_skb)->pkt_type = type;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static struct sk_buff *h4_dequeue(struct hci_uart *hu)
|
|
{
|
|
struct h4_struct *h4 = hu->priv;
|
|
return skb_dequeue(&h4->txq);
|
|
}
|
|
|
|
static 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 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 h4_deinit(void)
|
|
{
|
|
return hci_uart_unregister_proto(&h4p);
|
|
}
|