/* * * 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 { 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_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, void *data, int count) { int ret; if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) return -EUNATCH; ret = hci_recv_stream_fragment(hu->hdev, data, count); if (ret < 0) { BT_ERR("Frame Reassembly Failed"); return ret; } 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 __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); }