579 lines
12 KiB
C
579 lines
12 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/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 "2.2"
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static int reset = 0;
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static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
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int hci_uart_register_proto(struct hci_uart_proto *p)
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{
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if (p->id >= HCI_UART_MAX_PROTO)
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return -EINVAL;
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if (hup[p->id])
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return -EEXIST;
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hup[p->id] = p;
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return 0;
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}
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int hci_uart_unregister_proto(struct hci_uart_proto *p)
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{
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if (p->id >= HCI_UART_MAX_PROTO)
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return -EINVAL;
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if (!hup[p->id])
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return -EINVAL;
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hup[p->id] = NULL;
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return 0;
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}
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static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
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{
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if (id >= HCI_UART_MAX_PROTO)
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return NULL;
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return hup[id];
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}
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static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
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{
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struct hci_dev *hdev = hu->hdev;
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/* Update HCI stat counters */
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switch (pkt_type) {
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case HCI_COMMAND_PKT:
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hdev->stat.cmd_tx++;
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break;
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case HCI_ACLDATA_PKT:
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hdev->stat.acl_tx++;
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break;
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case HCI_SCODATA_PKT:
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hdev->stat.cmd_tx++;
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break;
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}
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}
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static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
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{
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struct sk_buff *skb = hu->tx_skb;
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if (!skb)
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skb = hu->proto->dequeue(hu);
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else
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hu->tx_skb = NULL;
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return skb;
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}
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int hci_uart_tx_wakeup(struct hci_uart *hu)
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{
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struct tty_struct *tty = hu->tty;
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struct hci_dev *hdev = hu->hdev;
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struct sk_buff *skb;
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if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
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set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
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return 0;
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}
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BT_DBG("");
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restart:
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clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
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while ((skb = hci_uart_dequeue(hu))) {
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int len;
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set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
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len = tty->ops->write(tty, skb->data, skb->len);
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hdev->stat.byte_tx += len;
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skb_pull(skb, len);
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if (skb->len) {
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hu->tx_skb = skb;
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break;
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}
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hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
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kfree_skb(skb);
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}
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if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
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goto restart;
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clear_bit(HCI_UART_SENDING, &hu->tx_state);
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return 0;
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}
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/* ------- Interface to HCI layer ------ */
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/* Initialize device */
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static int hci_uart_open(struct hci_dev *hdev)
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{
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BT_DBG("%s %p", hdev->name, hdev);
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/* Nothing to do for UART driver */
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set_bit(HCI_RUNNING, &hdev->flags);
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return 0;
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}
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/* Reset device */
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static int hci_uart_flush(struct hci_dev *hdev)
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{
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struct hci_uart *hu = (struct hci_uart *) hdev->driver_data;
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struct tty_struct *tty = hu->tty;
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BT_DBG("hdev %p tty %p", hdev, tty);
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if (hu->tx_skb) {
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kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
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}
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/* Flush any pending characters in the driver and discipline. */
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tty_ldisc_flush(tty);
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tty_driver_flush_buffer(tty);
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if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
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hu->proto->flush(hu);
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return 0;
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}
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/* Close device */
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static int hci_uart_close(struct hci_dev *hdev)
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{
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BT_DBG("hdev %p", hdev);
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if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
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return 0;
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hci_uart_flush(hdev);
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hdev->flush = NULL;
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return 0;
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}
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/* Send frames from HCI layer */
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static int hci_uart_send_frame(struct sk_buff *skb)
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{
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struct hci_dev* hdev = (struct hci_dev *) skb->dev;
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struct tty_struct *tty;
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struct hci_uart *hu;
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if (!hdev) {
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BT_ERR("Frame for uknown device (hdev=NULL)");
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return -ENODEV;
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}
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if (!test_bit(HCI_RUNNING, &hdev->flags))
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return -EBUSY;
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hu = (struct hci_uart *) hdev->driver_data;
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tty = hu->tty;
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BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
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hu->proto->enqueue(hu, skb);
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hci_uart_tx_wakeup(hu);
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return 0;
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}
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static void hci_uart_destruct(struct hci_dev *hdev)
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{
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if (!hdev)
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return;
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BT_DBG("%s", hdev->name);
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kfree(hdev->driver_data);
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}
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/* ------ LDISC part ------ */
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/* hci_uart_tty_open
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*
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* Called when line discipline changed to HCI_UART.
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*
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* Arguments:
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* tty pointer to tty info structure
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* Return Value:
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* 0 if success, otherwise error code
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*/
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static int hci_uart_tty_open(struct tty_struct *tty)
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{
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struct hci_uart *hu = (void *) tty->disc_data;
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BT_DBG("tty %p", tty);
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if (hu)
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return -EEXIST;
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if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
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BT_ERR("Can't allocate control structure");
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return -ENFILE;
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}
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tty->disc_data = hu;
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hu->tty = tty;
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tty->receive_room = 65536;
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spin_lock_init(&hu->rx_lock);
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/* Flush any pending characters in the driver and line discipline. */
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/* FIXME: why is this needed. Note don't use ldisc_ref here as the
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open path is before the ldisc is referencable */
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if (tty->ldisc->ops->flush_buffer)
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tty->ldisc->ops->flush_buffer(tty);
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tty_driver_flush_buffer(tty);
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return 0;
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}
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/* hci_uart_tty_close()
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*
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* Called when the line discipline is changed to something
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* else, the tty is closed, or the tty detects a hangup.
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*/
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static void hci_uart_tty_close(struct tty_struct *tty)
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{
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struct hci_uart *hu = (void *)tty->disc_data;
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BT_DBG("tty %p", tty);
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/* Detach from the tty */
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tty->disc_data = NULL;
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if (hu) {
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struct hci_dev *hdev = hu->hdev;
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if (hdev)
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hci_uart_close(hdev);
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if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
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hu->proto->close(hu);
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hci_unregister_dev(hdev);
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hci_free_dev(hdev);
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}
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}
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}
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/* hci_uart_tty_wakeup()
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*
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* Callback for transmit wakeup. Called when low level
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* device driver can accept more send data.
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*
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* Arguments: tty pointer to associated tty instance data
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* Return Value: None
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*/
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static void hci_uart_tty_wakeup(struct tty_struct *tty)
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{
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struct hci_uart *hu = (void *)tty->disc_data;
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BT_DBG("");
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if (!hu)
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return;
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clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
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if (tty != hu->tty)
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return;
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if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
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hci_uart_tx_wakeup(hu);
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}
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/* hci_uart_tty_receive()
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*
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* Called by tty low level driver when receive data is
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* available.
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*
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* Arguments: tty pointer to tty isntance data
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* data pointer to received data
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* flags pointer to flags for data
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* count count of received data in bytes
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*
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* Return Value: None
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*/
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static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count)
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{
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struct hci_uart *hu = (void *)tty->disc_data;
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if (!hu || tty != hu->tty)
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return;
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if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
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return;
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spin_lock(&hu->rx_lock);
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hu->proto->recv(hu, (void *) data, count);
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hu->hdev->stat.byte_rx += count;
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spin_unlock(&hu->rx_lock);
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tty_unthrottle(tty);
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}
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static int hci_uart_register_dev(struct hci_uart *hu)
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{
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struct hci_dev *hdev;
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BT_DBG("");
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/* Initialize and register HCI device */
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hdev = hci_alloc_dev();
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if (!hdev) {
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BT_ERR("Can't allocate HCI device");
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return -ENOMEM;
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}
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hu->hdev = hdev;
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hdev->type = HCI_UART;
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hdev->driver_data = hu;
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hdev->open = hci_uart_open;
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hdev->close = hci_uart_close;
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hdev->flush = hci_uart_flush;
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hdev->send = hci_uart_send_frame;
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hdev->destruct = hci_uart_destruct;
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hdev->owner = THIS_MODULE;
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if (!reset)
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set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
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if (hci_register_dev(hdev) < 0) {
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BT_ERR("Can't register HCI device");
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hci_free_dev(hdev);
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return -ENODEV;
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}
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return 0;
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}
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static int hci_uart_set_proto(struct hci_uart *hu, int id)
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{
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struct hci_uart_proto *p;
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int err;
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p = hci_uart_get_proto(id);
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if (!p)
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return -EPROTONOSUPPORT;
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err = p->open(hu);
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if (err)
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return err;
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hu->proto = p;
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err = hci_uart_register_dev(hu);
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if (err) {
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p->close(hu);
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return err;
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}
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return 0;
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}
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/* hci_uart_tty_ioctl()
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*
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* Process IOCTL system call for the tty device.
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*
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* Arguments:
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*
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* tty pointer to tty instance data
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* file pointer to open file object for device
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* cmd IOCTL command code
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* arg argument for IOCTL call (cmd dependent)
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*
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* Return Value: Command dependent
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*/
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static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
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unsigned int cmd, unsigned long arg)
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{
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struct hci_uart *hu = (void *)tty->disc_data;
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int err = 0;
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BT_DBG("");
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/* Verify the status of the device */
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if (!hu)
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return -EBADF;
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switch (cmd) {
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case HCIUARTSETPROTO:
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if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
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err = hci_uart_set_proto(hu, arg);
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if (err) {
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clear_bit(HCI_UART_PROTO_SET, &hu->flags);
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return err;
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}
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} else
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return -EBUSY;
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break;
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case HCIUARTGETPROTO:
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if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
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return hu->proto->id;
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return -EUNATCH;
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case HCIUARTGETDEVICE:
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if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
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return hu->hdev->id;
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return -EUNATCH;
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default:
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err = n_tty_ioctl_helper(tty, file, cmd, arg);
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break;
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};
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return err;
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}
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/*
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* We don't provide read/write/poll interface for user space.
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*/
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static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
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unsigned char __user *buf, size_t nr)
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{
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return 0;
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}
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static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
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const unsigned char *data, size_t count)
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{
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return 0;
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}
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static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
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struct file *filp, poll_table *wait)
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{
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return 0;
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}
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static int __init hci_uart_init(void)
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{
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static struct tty_ldisc_ops hci_uart_ldisc;
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int err;
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BT_INFO("HCI UART driver ver %s", VERSION);
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/* Register the tty discipline */
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memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
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hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
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hci_uart_ldisc.name = "n_hci";
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hci_uart_ldisc.open = hci_uart_tty_open;
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hci_uart_ldisc.close = hci_uart_tty_close;
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hci_uart_ldisc.read = hci_uart_tty_read;
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hci_uart_ldisc.write = hci_uart_tty_write;
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hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
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hci_uart_ldisc.poll = hci_uart_tty_poll;
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hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
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hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
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hci_uart_ldisc.owner = THIS_MODULE;
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if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
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BT_ERR("HCI line discipline registration failed. (%d)", err);
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return err;
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}
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|
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#ifdef CONFIG_BT_HCIUART_H4
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h4_init();
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#endif
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#ifdef CONFIG_BT_HCIUART_BCSP
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bcsp_init();
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#endif
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#ifdef CONFIG_BT_HCIUART_LL
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ll_init();
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#endif
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return 0;
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}
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|
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static void __exit hci_uart_exit(void)
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{
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int err;
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|
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#ifdef CONFIG_BT_HCIUART_H4
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h4_deinit();
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#endif
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#ifdef CONFIG_BT_HCIUART_BCSP
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bcsp_deinit();
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#endif
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#ifdef CONFIG_BT_HCIUART_LL
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ll_deinit();
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#endif
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|
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/* Release tty registration of line discipline */
|
|
if ((err = tty_unregister_ldisc(N_HCI)))
|
|
BT_ERR("Can't unregister HCI line discipline (%d)", err);
|
|
}
|
|
|
|
module_init(hci_uart_init);
|
|
module_exit(hci_uart_exit);
|
|
|
|
module_param(reset, bool, 0644);
|
|
MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
|
|
|
|
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
|
|
MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
|
|
MODULE_VERSION(VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_LDISC(N_HCI);
|