298 lines
6.1 KiB
C
298 lines
6.1 KiB
C
/*
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*
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* Bluetooth HCI UART driver
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*
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* Copyright (C) 2000-2001 Qualcomm Incorporated
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* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
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* Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
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*
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*
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.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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#ifndef CONFIG_BT_HCIUART_DEBUG
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#undef BT_DBG
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#define BT_DBG( A... )
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#endif
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#define VERSION "1.2"
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struct h4_struct {
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unsigned long rx_state;
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unsigned long rx_count;
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struct sk_buff *rx_skb;
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struct sk_buff_head txq;
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};
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/* H4 receiver States */
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#define H4_W4_PACKET_TYPE 0
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#define H4_W4_EVENT_HDR 1
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#define H4_W4_ACL_HDR 2
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#define H4_W4_SCO_HDR 3
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#define H4_W4_DATA 4
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/* Initialize protocol */
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static int h4_open(struct hci_uart *hu)
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{
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struct h4_struct *h4;
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BT_DBG("hu %p", hu);
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h4 = kzalloc(sizeof(*h4), GFP_ATOMIC);
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if (!h4)
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return -ENOMEM;
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skb_queue_head_init(&h4->txq);
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hu->priv = h4;
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return 0;
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}
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/* Flush protocol data */
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static int h4_flush(struct hci_uart *hu)
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{
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struct h4_struct *h4 = hu->priv;
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BT_DBG("hu %p", hu);
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skb_queue_purge(&h4->txq);
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return 0;
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}
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/* Close protocol */
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static int h4_close(struct hci_uart *hu)
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{
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struct h4_struct *h4 = hu->priv;
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hu->priv = NULL;
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BT_DBG("hu %p", hu);
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skb_queue_purge(&h4->txq);
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if (h4->rx_skb)
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kfree_skb(h4->rx_skb);
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hu->priv = NULL;
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kfree(h4);
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return 0;
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}
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/* Enqueue frame for transmittion (padding, crc, etc) */
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static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
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{
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struct h4_struct *h4 = hu->priv;
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BT_DBG("hu %p skb %p", hu, skb);
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/* Prepend skb with frame type */
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memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
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skb_queue_tail(&h4->txq, skb);
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return 0;
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}
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static inline int h4_check_data_len(struct h4_struct *h4, int len)
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{
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register int room = skb_tailroom(h4->rx_skb);
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BT_DBG("len %d room %d", len, room);
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if (!len) {
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hci_recv_frame(h4->rx_skb);
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} else if (len > room) {
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BT_ERR("Data length is too large");
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kfree_skb(h4->rx_skb);
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} else {
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h4->rx_state = H4_W4_DATA;
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h4->rx_count = len;
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return len;
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}
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h4->rx_state = H4_W4_PACKET_TYPE;
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h4->rx_skb = NULL;
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h4->rx_count = 0;
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return 0;
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}
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/* Recv data */
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static int h4_recv(struct hci_uart *hu, void *data, int count)
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{
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struct h4_struct *h4 = hu->priv;
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register char *ptr;
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struct hci_event_hdr *eh;
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struct hci_acl_hdr *ah;
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struct hci_sco_hdr *sh;
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register int len, type, dlen;
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BT_DBG("hu %p count %d rx_state %ld rx_count %ld",
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hu, count, h4->rx_state, h4->rx_count);
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ptr = data;
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while (count) {
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if (h4->rx_count) {
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len = min_t(unsigned int, h4->rx_count, count);
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memcpy(skb_put(h4->rx_skb, len), ptr, len);
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h4->rx_count -= len; count -= len; ptr += len;
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if (h4->rx_count)
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continue;
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switch (h4->rx_state) {
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case H4_W4_DATA:
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BT_DBG("Complete data");
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hci_recv_frame(h4->rx_skb);
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h4->rx_state = H4_W4_PACKET_TYPE;
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h4->rx_skb = NULL;
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continue;
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case H4_W4_EVENT_HDR:
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eh = (struct hci_event_hdr *) h4->rx_skb->data;
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BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
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h4_check_data_len(h4, eh->plen);
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continue;
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case H4_W4_ACL_HDR:
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ah = (struct hci_acl_hdr *) h4->rx_skb->data;
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dlen = __le16_to_cpu(ah->dlen);
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BT_DBG("ACL header: dlen %d", dlen);
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h4_check_data_len(h4, dlen);
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continue;
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case H4_W4_SCO_HDR:
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sh = (struct hci_sco_hdr *) h4->rx_skb->data;
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BT_DBG("SCO header: dlen %d", sh->dlen);
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h4_check_data_len(h4, sh->dlen);
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continue;
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}
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}
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/* H4_W4_PACKET_TYPE */
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switch (*ptr) {
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case HCI_EVENT_PKT:
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BT_DBG("Event packet");
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h4->rx_state = H4_W4_EVENT_HDR;
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h4->rx_count = HCI_EVENT_HDR_SIZE;
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type = HCI_EVENT_PKT;
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break;
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case HCI_ACLDATA_PKT:
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BT_DBG("ACL packet");
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h4->rx_state = H4_W4_ACL_HDR;
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h4->rx_count = HCI_ACL_HDR_SIZE;
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type = HCI_ACLDATA_PKT;
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break;
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case HCI_SCODATA_PKT:
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BT_DBG("SCO packet");
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h4->rx_state = H4_W4_SCO_HDR;
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h4->rx_count = HCI_SCO_HDR_SIZE;
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type = HCI_SCODATA_PKT;
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break;
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default:
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BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
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hu->hdev->stat.err_rx++;
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ptr++; count--;
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continue;
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};
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ptr++; count--;
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/* Allocate packet */
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h4->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
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if (!h4->rx_skb) {
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BT_ERR("Can't allocate mem for new packet");
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h4->rx_state = H4_W4_PACKET_TYPE;
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h4->rx_count = 0;
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return 0;
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}
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h4->rx_skb->dev = (void *) hu->hdev;
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bt_cb(h4->rx_skb)->pkt_type = type;
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}
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return count;
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}
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static struct sk_buff *h4_dequeue(struct hci_uart *hu)
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{
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struct h4_struct *h4 = hu->priv;
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return skb_dequeue(&h4->txq);
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}
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static struct hci_uart_proto h4p = {
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.id = HCI_UART_H4,
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.open = h4_open,
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.close = h4_close,
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.recv = h4_recv,
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.enqueue = h4_enqueue,
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.dequeue = h4_dequeue,
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.flush = h4_flush,
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};
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int h4_init(void)
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{
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int err = hci_uart_register_proto(&h4p);
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if (!err)
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BT_INFO("HCI H4 protocol initialized");
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else
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BT_ERR("HCI H4 protocol registration failed");
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return err;
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}
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int h4_deinit(void)
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{
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return hci_uart_unregister_proto(&h4p);
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}
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