hci_h4.c
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上传日期:2013-04-10
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文件大小:6k
- /*
- BlueZ - Bluetooth protocol stack for Linux
- Copyright (C) 2000-2001 Qualcomm Incorporated
- Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License version 2 as
- published by the Free Software Foundation;
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
- IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
- CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
- COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
- SOFTWARE IS DISCLAIMED.
- */
- /*
- * BlueZ HCI UART(H4) protocol.
- *
- * $Id: hci_h4.c,v 1.2 2002/04/17 17:37:20 maxk Exp $
- */
- #define VERSION "1.1"
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/version.h>
- #include <linux/config.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"
- #include "hci_h4.h"
- #ifndef HCI_UART_DEBUG
- #undef BT_DBG
- #define BT_DBG( A... )
- #undef BT_DMP
- #define BT_DMP( A... )
- #endif
- /* Initialize protocol */
- static int h4_open(struct n_hci *n_hci)
- {
- struct h4_struct *h4;
-
- BT_DBG("n_hci %p", n_hci);
-
- h4 = kmalloc(sizeof(*h4), GFP_ATOMIC);
- if (!h4)
- return -ENOMEM;
- memset(h4, 0, sizeof(*h4));
- n_hci->priv = h4;
- return 0;
- }
- /* Flush protocol data */
- static int h4_flush(struct n_hci *n_hci)
- {
- BT_DBG("n_hci %p", n_hci);
- return 0;
- }
- /* Close protocol */
- static int h4_close(struct n_hci *n_hci)
- {
- struct h4_struct *h4 = n_hci->priv;
- n_hci->priv = NULL;
- BT_DBG("n_hci %p", n_hci);
- if (h4->rx_skb)
- kfree_skb(h4->rx_skb);
- kfree(h4);
- return 0;
- }
- /* Send data */
- static int h4_send(struct n_hci *n_hci, void *data, int len)
- {
- struct tty_struct *tty = n_hci->tty;
-
- BT_DBG("n_hci %p len %d", n_hci, len);
- /* Send frame to TTY driver */
- tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
- return tty->driver.write(tty, 0, data, len);
- }
- /* Init frame before queueing (padding, crc, etc) */
- static struct sk_buff* h4_preq(struct n_hci *n_hci, struct sk_buff *skb)
- {
- BT_DBG("n_hci %p skb %p", n_hci, skb);
- /* Prepend skb with frame type */
- memcpy(skb_push(skb, 1), &skb->pkt_type, 1);
- return skb;
- }
- 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) {
- BT_DMP(h4->rx_skb->data, h4->rx_skb->len);
- hci_recv_frame(h4->rx_skb);
- } else if (len > room) {
- BT_ERR("Data length is to 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 n_hci *n_hci, void *data, int count)
- {
- struct h4_struct *h4 = n_hci->priv;
- register char *ptr;
- hci_event_hdr *eh;
- hci_acl_hdr *ah;
- hci_sco_hdr *sh;
- register int len, type, dlen;
- BT_DBG("n_hci %p count %d rx_state %ld rx_count %ld", n_hci, count, h4->rx_state, h4->rx_count);
- ptr = data;
- while (count) {
- if (h4->rx_count) {
- len = MIN(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");
- BT_DMP(h4->rx_skb->data, h4->rx_skb->len);
- hci_recv_frame(h4->rx_skb);
- h4->rx_state = H4_W4_PACKET_TYPE;
- h4->rx_skb = NULL;
- continue;
- case H4_W4_EVENT_HDR:
- eh = (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 = (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 = (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);
- n_hci->hdev.stat.err_rx++;
- ptr++; count--;
- continue;
- };
- ptr++; count--;
- /* Allocate packet */
- h4->rx_skb = bluez_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 *) &n_hci->hdev;
- h4->rx_skb->pkt_type = type;
- }
- return count;
- }
- static struct hci_uart_proto h4p = {
- id: HCI_UART_H4,
- open: h4_open,
- close: h4_close,
- send: h4_send,
- recv: h4_recv,
- preq: h4_preq,
- flush: h4_flush,
- };
-
- int h4_init(void)
- {
- return hci_uart_register_proto(&h4p);
- }
- int h4_deinit(void)
- {
- return hci_uart_unregister_proto(&h4p);
- }