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168 lines
3.4 KiB
168 lines
3.4 KiB
/* |
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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/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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#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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/* 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_KERNEL); |
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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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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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/* 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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int ret; |
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if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) |
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return -EUNATCH; |
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ret = hci_recv_stream_fragment(hu->hdev, data, count); |
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if (ret < 0) { |
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BT_ERR("Frame Reassembly Failed"); |
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return ret; |
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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 __init 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 __exit 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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