[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / bluetooth / hci_ldisc.c

/*
 *
 *  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 "2.2"

static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];

int hci_uart_register_proto(struct hci_uart_proto *p)
{
	if (p->id >= HCI_UART_MAX_PROTO)
		return -EINVAL;

	if (hup[p->id])
		return -EEXIST;

	hup[p->id] = p;

	return 0;
}

int hci_uart_unregister_proto(struct hci_uart_proto *p)
{
	if (p->id >= HCI_UART_MAX_PROTO)
		return -EINVAL;

	if (!hup[p->id])
		return -EINVAL;

	hup[p->id] = NULL;

	return 0;
}

static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
{
	if (id >= HCI_UART_MAX_PROTO)
		return NULL;

	return hup[id];
}

static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
{
	struct hci_dev *hdev = hu->hdev;

	/* Update HCI stat counters */
	switch (pkt_type) {
	case HCI_COMMAND_PKT:
		hdev->stat.cmd_tx++;
		break;

	case HCI_ACLDATA_PKT:
		hdev->stat.acl_tx++;
		break;

	case HCI_SCODATA_PKT:
		hdev->stat.sco_tx++;
		break;
	}
}

static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
{
	struct sk_buff *skb = hu->tx_skb;

	if (!skb)
		skb = hu->proto->dequeue(hu);
	else
		hu->tx_skb = NULL;

	return skb;
}

int hci_uart_tx_wakeup(struct hci_uart *hu)
{
	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
		set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
		return 0;
	}

	BT_DBG("");

	schedule_work(&hu->write_work);

	return 0;
}

static void hci_uart_write_work(struct work_struct *work)
{
	struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
	struct tty_struct *tty = hu->tty;
	struct hci_dev *hdev = hu->hdev;
	struct sk_buff *skb;

	/* REVISIT: should we cope with bad skbs or ->write() returning
	 * and error value ?
	 */

restart:
	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);

	while ((skb = hci_uart_dequeue(hu))) {
		int len;

		set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
		len = tty->ops->write(tty, skb->data, skb->len);
		hdev->stat.byte_tx += len;

		skb_pull(skb, len);
		if (skb->len) {
			hu->tx_skb = skb;
			break;
		}

		hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
		kfree_skb(skb);
	}

	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
		goto restart;

	clear_bit(HCI_UART_SENDING, &hu->tx_state);
}

static void hci_uart_init_work(struct work_struct *work)
{
	struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
	int err;

	if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
		return;

	err = hci_register_dev(hu->hdev);
	if (err < 0) {
		BT_ERR("Can't register HCI device");
		hci_free_dev(hu->hdev);
		hu->hdev = NULL;
		hu->proto->close(hu);
	}

	set_bit(HCI_UART_REGISTERED, &hu->flags);
}

int hci_uart_init_ready(struct hci_uart *hu)
{
	if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
		return -EALREADY;

	schedule_work(&hu->init_ready);

	return 0;
}

/* ------- Interface to HCI layer ------ */
/* Initialize device */
static int hci_uart_open(struct hci_dev *hdev)
{
	BT_DBG("%s %p", hdev->name, hdev);

	/* Nothing to do for UART driver */

	set_bit(HCI_RUNNING, &hdev->flags);

	return 0;
}

/* Reset device */
static int hci_uart_flush(struct hci_dev *hdev)
{
	struct hci_uart *hu  = hci_get_drvdata(hdev);
	struct tty_struct *tty = hu->tty;

	BT_DBG("hdev %p tty %p", hdev, tty);

	if (hu->tx_skb) {
		kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
	}

	/* Flush any pending characters in the driver and discipline. */
	tty_ldisc_flush(tty);
	tty_driver_flush_buffer(tty);

	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
		hu->proto->flush(hu);

	return 0;
}

/* Close device */
static int hci_uart_close(struct hci_dev *hdev)
{
	BT_DBG("hdev %p", hdev);

	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
		return 0;

	hci_uart_flush(hdev);
	hdev->flush = NULL;
	return 0;
}

/* Send frames from HCI layer */
static int hci_uart_send_frame(struct sk_buff *skb)
{
	struct hci_dev* hdev = (struct hci_dev *) skb->dev;
	struct hci_uart *hu;

	if (!hdev) {
		BT_ERR("Frame for unknown device (hdev=NULL)");
		return -ENODEV;
	}

	if (!test_bit(HCI_RUNNING, &hdev->flags))
		return -EBUSY;

	hu = hci_get_drvdata(hdev);

	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);

	hu->proto->enqueue(hu, skb);

	hci_uart_tx_wakeup(hu);

	return 0;
}

/* ------ LDISC part ------ */
/* hci_uart_tty_open
 *
 *     Called when line discipline changed to HCI_UART.
 *
 * Arguments:
 *     tty    pointer to tty info structure
 * Return Value:
 *     0 if success, otherwise error code
 */
static int hci_uart_tty_open(struct tty_struct *tty)
{
	struct hci_uart *hu;

	BT_DBG("tty %p", tty);

	/* Error if the tty has no write op instead of leaving an exploitable
	   hole */
	if (tty->ops->write == NULL)
		return -EOPNOTSUPP;

	if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
		BT_ERR("Can't allocate control structure");
		return -ENFILE;
	}

	tty->disc_data = hu;
	hu->tty = tty;
	tty->receive_room = 65536;

	INIT_WORK(&hu->init_ready, hci_uart_init_work);
	INIT_WORK(&hu->write_work, hci_uart_write_work);

	spin_lock_init(&hu->rx_lock);

	/* Flush any pending characters in the driver and line discipline. */

	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
	   open path is before the ldisc is referencable */

	if (tty->ldisc->ops->flush_buffer)
		tty->ldisc->ops->flush_buffer(tty);
	tty_driver_flush_buffer(tty);

	return 0;
}

/* hci_uart_tty_close()
 *
 *    Called when the line discipline is changed to something
 *    else, the tty is closed, or the tty detects a hangup.
 */
static void hci_uart_tty_close(struct tty_struct *tty)
{
	struct hci_uart *hu = (void *)tty->disc_data;
	struct hci_dev *hdev;

	BT_DBG("tty %p", tty);

	/* Detach from the tty */
	tty->disc_data = NULL;

	if (!hu)
		return;

	hdev = hu->hdev;
	if (hdev)
		hci_uart_close(hdev);

	cancel_work_sync(&hu->write_work);

	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
		if (hdev) {
			if (test_bit(HCI_UART_REGISTERED, &hu->flags))
				hci_unregister_dev(hdev);
			hci_free_dev(hdev);
		}
		hu->proto->close(hu);
	}

	kfree(hu);
}

/* hci_uart_tty_wakeup()
 *
 *    Callback for transmit wakeup. Called when low level
 *    device driver can accept more send data.
 *
 * Arguments:        tty    pointer to associated tty instance data
 * Return Value:    None
 */
static void hci_uart_tty_wakeup(struct tty_struct *tty)
{
	struct hci_uart *hu = (void *)tty->disc_data;

	BT_DBG("");

	if (!hu)
		return;

	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);

	if (tty != hu->tty)
		return;

	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
		hci_uart_tx_wakeup(hu);
}

/* hci_uart_tty_receive()
 *
 *     Called by tty low level driver when receive data is
 *     available.
 *
 * Arguments:  tty          pointer to tty isntance data
 *             data         pointer to received data
 *             flags        pointer to flags for data
 *             count        count of received data in bytes
 *
 * Return Value:    None
 */
static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count)
{
	struct hci_uart *hu = (void *)tty->disc_data;

	if (!hu || tty != hu->tty)
		return;

	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
		return;

	spin_lock(&hu->rx_lock);
	hu->proto->recv(hu, (void *) data, count);

	if (hu->hdev)
		hu->hdev->stat.byte_rx += count;

	spin_unlock(&hu->rx_lock);

	tty_unthrottle(tty);
}

static int hci_uart_register_dev(struct hci_uart *hu)
{
	struct hci_dev *hdev;

	BT_DBG("");

	/* Initialize and register HCI device */
	hdev = hci_alloc_dev();
	if (!hdev) {
		BT_ERR("Can't allocate HCI device");
		return -ENOMEM;
	}

	hu->hdev = hdev;

	hdev->bus = HCI_UART;
	hci_set_drvdata(hdev, hu);

	hdev->open  = hci_uart_open;
	hdev->close = hci_uart_close;
	hdev->flush = hci_uart_flush;
	hdev->send  = hci_uart_send_frame;
	SET_HCIDEV_DEV(hdev, hu->tty->dev);

	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
		set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);

	if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
		set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);

	if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
		hdev->dev_type = HCI_AMP;
	else
		hdev->dev_type = HCI_BREDR;

	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
		return 0;

	if (hci_register_dev(hdev) < 0) {
		BT_ERR("Can't register HCI device");
		hci_free_dev(hdev);
		return -ENODEV;
	}

	set_bit(HCI_UART_REGISTERED, &hu->flags);

	return 0;
}

static int hci_uart_set_proto(struct hci_uart *hu, int id)
{
	struct hci_uart_proto *p;
	int err;

	p = hci_uart_get_proto(id);
	if (!p)
		return -EPROTONOSUPPORT;

	err = p->open(hu);
	if (err)
		return err;

	hu->proto = p;

	err = hci_uart_register_dev(hu);
	if (err) {
		p->close(hu);
		return err;
	}

	return 0;
}

/* hci_uart_tty_ioctl()
 *
 *    Process IOCTL system call for the tty device.
 *
 * Arguments:
 *
 *    tty        pointer to tty instance data
 *    file       pointer to open file object for device
 *    cmd        IOCTL command code
 *    arg        argument for IOCTL call (cmd dependent)
 *
 * Return Value:    Command dependent
 */
static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
					unsigned int cmd, unsigned long arg)
{
	struct hci_uart *hu = (void *)tty->disc_data;
	int err = 0;

	BT_DBG("");

	/* Verify the status of the device */
	if (!hu)
		return -EBADF;

	switch (cmd) {
	case HCIUARTSETPROTO:
		if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
			err = hci_uart_set_proto(hu, arg);
			if (err) {
				clear_bit(HCI_UART_PROTO_SET, &hu->flags);
				return err;
			}
		} else
			return -EBUSY;
		break;

	case HCIUARTGETPROTO:
		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
			return hu->proto->id;
		return -EUNATCH;

	case HCIUARTGETDEVICE:
		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
			return hu->hdev->id;
		return -EUNATCH;

	case HCIUARTSETFLAGS:
		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
			return -EBUSY;
		hu->hdev_flags = arg;
		break;

	case HCIUARTGETFLAGS:
		return hu->hdev_flags;

	default:
		err = n_tty_ioctl_helper(tty, file, cmd, arg);
		break;
	}

	return err;
}

/*
 * We don't provide read/write/poll interface for user space.
 */
static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
					unsigned char __user *buf, size_t nr)
{
	return 0;
}

static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
					const unsigned char *data, size_t count)
{
	return 0;
}

static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
					struct file *filp, poll_table *wait)
{
	return 0;
}

static int __init hci_uart_init(void)
{
	static struct tty_ldisc_ops hci_uart_ldisc;
	int err;

	BT_INFO("HCI UART driver ver %s", VERSION);

	/* Register the tty discipline */

	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
	hci_uart_ldisc.magic		= TTY_LDISC_MAGIC;
	hci_uart_ldisc.name		= "n_hci";
	hci_uart_ldisc.open		= hci_uart_tty_open;
	hci_uart_ldisc.close		= hci_uart_tty_close;
	hci_uart_ldisc.read		= hci_uart_tty_read;
	hci_uart_ldisc.write		= hci_uart_tty_write;
	hci_uart_ldisc.ioctl		= hci_uart_tty_ioctl;
	hci_uart_ldisc.poll		= hci_uart_tty_poll;
	hci_uart_ldisc.receive_buf	= hci_uart_tty_receive;
	hci_uart_ldisc.write_wakeup	= hci_uart_tty_wakeup;
	hci_uart_ldisc.owner		= THIS_MODULE;

	if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
		BT_ERR("HCI line discipline registration failed. (%d)", err);
		return err;
	}

#ifdef CONFIG_BT_HCIUART_H4
	h4_init();
#endif
#ifdef CONFIG_BT_HCIUART_BCSP
	bcsp_init();
#endif
#ifdef CONFIG_BT_HCIUART_LL
	ll_init();
#endif
#ifdef CONFIG_BT_HCIUART_ATH3K
	ath_init();
#endif
#ifdef CONFIG_BT_HCIUART_3WIRE
	h5_init();
#endif

	return 0;
}

static void __exit hci_uart_exit(void)
{
	int err;

#ifdef CONFIG_BT_HCIUART_H4
	h4_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_BCSP
	bcsp_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_LL
	ll_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_ATH3K
	ath_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_3WIRE
	h5_deinit();
#endif

	/* 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_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);
Commit	Line	Data
1da177e4	1	/*
1da177e4	2	*
0372a662 MH	3	* Bluetooth HCI UART driver
	4	*
	5	* Copyright (C) 2000-2001 Qualcomm Incorporated
	6	* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
	7	* Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
	8	*
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*
1da177e4	24	*/
1da177e4	25
1da177e4 LT	26	#include <linux/module.h>
	27
	28	#include <linux/kernel.h>
	29	#include <linux/init.h>
1da177e4 LT	30	#include <linux/types.h>
	31	#include <linux/fcntl.h>
	32	#include <linux/interrupt.h>
	33	#include <linux/ptrace.h>
	34	#include <linux/poll.h>
	35
	36	#include <linux/slab.h>
	37	#include <linux/tty.h>
	38	#include <linux/errno.h>
	39	#include <linux/string.h>
	40	#include <linux/signal.h>
	41	#include <linux/ioctl.h>
	42	#include <linux/skbuff.h>
	43
	44	#include <net/bluetooth/bluetooth.h>
	45	#include <net/bluetooth/hci_core.h>
	46
	47	#include "hci_uart.h"
	48
0372a662 MH	49	#define VERSION "2.2"
0372a662 MH	50
1da177e4 LT	51	static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
	52
	53	int hci_uart_register_proto(struct hci_uart_proto *p)
	54	{
	55	if (p->id >= HCI_UART_MAX_PROTO)
	56	return -EINVAL;
	57
	58	if (hup[p->id])
	59	return -EEXIST;
	60
	61	hup[p->id] = p;
0372a662	62
1da177e4 LT	63	return 0;
	64	}
	65
	66	int hci_uart_unregister_proto(struct hci_uart_proto *p)
	67	{
	68	if (p->id >= HCI_UART_MAX_PROTO)
	69	return -EINVAL;
	70
	71	if (!hup[p->id])
	72	return -EINVAL;
	73
	74	hup[p->id] = NULL;
0372a662	75
1da177e4 LT	76	return 0;
	77	}
	78
	79	static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
	80	{
	81	if (id >= HCI_UART_MAX_PROTO)
	82	return NULL;
0372a662	83
1da177e4 LT	84	return hup[id];
	85	}
	86
	87	static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
	88	{
	89	struct hci_dev *hdev = hu->hdev;
0372a662	90
1da177e4 LT	91	/* Update HCI stat counters */
	92	switch (pkt_type) {
	93	case HCI_COMMAND_PKT:
	94	hdev->stat.cmd_tx++;
	95	break;
	96
	97	case HCI_ACLDATA_PKT:
	98	hdev->stat.acl_tx++;
	99	break;
	100
	101	case HCI_SCODATA_PKT:
7f8f2729	102	hdev->stat.sco_tx++;
1da177e4 LT	103	break;
	104	}
	105	}
	106
	107	static inline struct sk_buff hci_uart_dequeue(struct hci_uart hu)
	108	{
	109	struct sk_buff *skb = hu->tx_skb;
0372a662	110
1da177e4 LT	111	if (!skb)
	112	skb = hu->proto->dequeue(hu);
	113	else
	114	hu->tx_skb = NULL;
0372a662	115
1da177e4 LT	116	return skb;
	117	}
	118
	119	int hci_uart_tx_wakeup(struct hci_uart *hu)
	120	{
1da177e4 LT	121	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
	122	set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	123	return 0;
	124	}
	125
	126	BT_DBG("");
	127
a22d29e6 FB	128	schedule_work(&hu->write_work);
	129
	130	return 0;
	131	}
	132
	133	static void hci_uart_write_work(struct work_struct *work)
	134	{
	135	struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
	136	struct tty_struct *tty = hu->tty;
	137	struct hci_dev *hdev = hu->hdev;
	138	struct sk_buff *skb;
	139
	140	/* REVISIT: should we cope with bad skbs or ->write() returning
	141	* and error value ?
	142	*/
	143
1da177e4 LT	144	restart:
	145	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	146
	147	while ((skb = hci_uart_dequeue(hu))) {
	148	int len;
0372a662	149
1da177e4	150	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
f34d7a5b	151	len = tty->ops->write(tty, skb->data, skb->len);
1da177e4 LT	152	hdev->stat.byte_tx += len;
	153
	154	skb_pull(skb, len);
	155	if (skb->len) {
	156	hu->tx_skb = skb;
	157	break;
	158	}
0372a662	159
0d48d939	160	hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
1da177e4	161	kfree_skb(skb);
0372a662 MH	162	}
0372a662 MH	163
1da177e4 LT	164	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
	165	goto restart;
	166
	167	clear_bit(HCI_UART_SENDING, &hu->tx_state);
1da177e4 LT	168	}
1da177e4 LT	169
9f2aee84 JH	170	static void hci_uart_init_work(struct work_struct *work)
	171	{
	172	struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
	173	int err;
	174
	175	if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	176	return;
	177
	178	err = hci_register_dev(hu->hdev);
	179	if (err < 0) {
	180	BT_ERR("Can't register HCI device");
	181	hci_free_dev(hu->hdev);
	182	hu->hdev = NULL;
	183	hu->proto->close(hu);
	184	}
	185
	186	set_bit(HCI_UART_REGISTERED, &hu->flags);
	187	}
	188
	189	int hci_uart_init_ready(struct hci_uart *hu)
	190	{
	191	if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	192	return -EALREADY;
	193
	194	schedule_work(&hu->init_ready);
	195
	196	return 0;
	197	}
	198
1da177e4 LT	199	/* ------- Interface to HCI layer ------ */
	200	/* Initialize device */
	201	static int hci_uart_open(struct hci_dev *hdev)
	202	{
	203	BT_DBG("%s %p", hdev->name, hdev);
	204
	205	/* Nothing to do for UART driver */
	206
	207	set_bit(HCI_RUNNING, &hdev->flags);
0372a662	208
1da177e4 LT	209	return 0;
	210	}
	211
	212	/* Reset device */
	213	static int hci_uart_flush(struct hci_dev *hdev)
	214	{
155961e8	215	struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4 LT	216	struct tty_struct *tty = hu->tty;
	217
	218	BT_DBG("hdev %p tty %p", hdev, tty);
	219
	220	if (hu->tx_skb) {
	221	kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
	222	}
	223
	224	/* Flush any pending characters in the driver and discipline. */
	225	tty_ldisc_flush(tty);
f34d7a5b	226	tty_driver_flush_buffer(tty);
1da177e4 LT	227
	228	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	229	hu->proto->flush(hu);
	230
	231	return 0;
	232	}
	233
	234	/* Close device */
	235	static int hci_uart_close(struct hci_dev *hdev)
	236	{
	237	BT_DBG("hdev %p", hdev);
	238
	239	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
	240	return 0;
	241
	242	hci_uart_flush(hdev);
3611f4d2	243	hdev->flush = NULL;
1da177e4 LT	244	return 0;
	245	}
	246
	247	/* Send frames from HCI layer */
	248	static int hci_uart_send_frame(struct sk_buff *skb)
	249	{
	250	struct hci_dev* hdev = (struct hci_dev *) skb->dev;
1da177e4 LT	251	struct hci_uart *hu;
	252
	253	if (!hdev) {
af901ca1	254	BT_ERR("Frame for unknown device (hdev=NULL)");
1da177e4 LT	255	return -ENODEV;
	256	}
	257
	258	if (!test_bit(HCI_RUNNING, &hdev->flags))
	259	return -EBUSY;
	260
155961e8	261	hu = hci_get_drvdata(hdev);
1da177e4	262
0d48d939	263	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1da177e4 LT	264
	265	hu->proto->enqueue(hu, skb);
	266
	267	hci_uart_tx_wakeup(hu);
0372a662	268
1da177e4 LT	269	return 0;
	270	}
	271
1da177e4 LT	272	/* ------ LDISC part ------ */
1da177e4 LT	273	/* hci_uart_tty_open
1687dfc3	274	*
1da177e4 LT	275	* Called when line discipline changed to HCI_UART.
	276	*
	277	* Arguments:
	278	* tty pointer to tty info structure
1687dfc3	279	* Return Value:
1da177e4 LT	280	* 0 if success, otherwise error code
	281	*/
	282	static int hci_uart_tty_open(struct tty_struct *tty)
	283	{
f327b340	284	struct hci_uart *hu;
1da177e4 LT	285
	286	BT_DBG("tty %p", tty);
	287
c19483cc AC	288	/* Error if the tty has no write op instead of leaving an exploitable
	289	hole */
	290	if (tty->ops->write == NULL)
	291	return -EOPNOTSUPP;
	292
089b1dbb	293	if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
7785162c	294	BT_ERR("Can't allocate control structure");
1da177e4 LT	295	return -ENFILE;
1da177e4 LT	296	}
0372a662	297
1da177e4 LT	298	tty->disc_data = hu;
1da177e4 LT	299	hu->tty = tty;
33f0f88f	300	tty->receive_room = 65536;
1da177e4	301
9f2aee84	302	INIT_WORK(&hu->init_ready, hci_uart_init_work);
a22d29e6	303	INIT_WORK(&hu->write_work, hci_uart_write_work);
9f2aee84	304
1da177e4 LT	305	spin_lock_init(&hu->rx_lock);
	306
	307	/* Flush any pending characters in the driver and line discipline. */
0372a662	308
1da177e4 LT	309	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
1da177e4 LT	310	open path is before the ldisc is referencable */
0372a662	311
c65c9bc3 AC	312	if (tty->ldisc->ops->flush_buffer)
c65c9bc3 AC	313	tty->ldisc->ops->flush_buffer(tty);
f34d7a5b	314	tty_driver_flush_buffer(tty);
1da177e4 LT	315
	316	return 0;
	317	}
	318
	319	/* hci_uart_tty_close()
	320	*
	321	* Called when the line discipline is changed to something
	322	* else, the tty is closed, or the tty detects a hangup.
	323	*/
	324	static void hci_uart_tty_close(struct tty_struct *tty)
	325	{
	326	struct hci_uart hu = (void )tty->disc_data;
dac670b9	327	struct hci_dev *hdev;
1da177e4 LT	328
	329	BT_DBG("tty %p", tty);
	330
	331	/* Detach from the tty */
	332	tty->disc_data = NULL;
	333
dac670b9 JH	334	if (!hu)
dac670b9 JH	335	return;
22ad4203	336
dac670b9 JH	337	hdev = hu->hdev;
	338	if (hdev)
	339	hci_uart_close(hdev);
1da177e4	340
a22d29e6 FB	341	cancel_work_sync(&hu->write_work);
a22d29e6 FB	342
dac670b9 JH	343	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
dac670b9 JH	344	if (hdev) {
9f2aee84 JH	345	if (test_bit(HCI_UART_REGISTERED, &hu->flags))
9f2aee84 JH	346	hci_unregister_dev(hdev);
dac670b9	347	hci_free_dev(hdev);
1da177e4	348	}
dac670b9	349	hu->proto->close(hu);
1da177e4	350	}
dac670b9 JH	351
dac670b9 JH	352	kfree(hu);
1da177e4 LT	353	}
	354
	355	/* hci_uart_tty_wakeup()
	356	*
	357	* Callback for transmit wakeup. Called when low level
	358	* device driver can accept more send data.
	359	*
	360	* Arguments: tty pointer to associated tty instance data
	361	* Return Value: None
	362	*/
	363	static void hci_uart_tty_wakeup(struct tty_struct *tty)
	364	{
	365	struct hci_uart hu = (void )tty->disc_data;
	366
	367	BT_DBG("");
	368
	369	if (!hu)
	370	return;
	371
	372	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	373
	374	if (tty != hu->tty)
	375	return;
	376
	377	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	378	hci_uart_tx_wakeup(hu);
	379	}
	380
1da177e4	381	/* hci_uart_tty_receive()
1687dfc3	382	*
1da177e4 LT	383	* Called by tty low level driver when receive data is
1da177e4 LT	384	* available.
1687dfc3	385	*
1da177e4 LT	386	* Arguments: tty pointer to tty isntance data
	387	* data pointer to received data
	388	* flags pointer to flags for data
	389	* count count of received data in bytes
1687dfc3	390	*
55db4c64	391	* Return Value: None
1da177e4	392	*/
55db4c64	393	static void hci_uart_tty_receive(struct tty_struct tty, const u8 data, char *flags, int count)
1da177e4 LT	394	{
1da177e4 LT	395	struct hci_uart hu = (void )tty->disc_data;
0372a662	396
1da177e4	397	if (!hu \|\| tty != hu->tty)
55db4c64	398	return;
1da177e4 LT	399
1da177e4 LT	400	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
55db4c64	401	return;
0372a662	402
1da177e4	403	spin_lock(&hu->rx_lock);
55db4c64	404	hu->proto->recv(hu, (void *) data, count);
788f0923 CP	405
	406	if (hu->hdev)
	407	hu->hdev->stat.byte_rx += count;
	408
1da177e4 LT	409	spin_unlock(&hu->rx_lock);
1da177e4 LT	410
39c2e60f	411	tty_unthrottle(tty);
1da177e4 LT	412	}
	413
	414	static int hci_uart_register_dev(struct hci_uart *hu)
	415	{
	416	struct hci_dev *hdev;
	417
	418	BT_DBG("");
	419
	420	/* Initialize and register HCI device */
	421	hdev = hci_alloc_dev();
	422	if (!hdev) {
	423	BT_ERR("Can't allocate HCI device");
	424	return -ENOMEM;
	425	}
	426
	427	hu->hdev = hdev;
	428
c13854ce	429	hdev->bus = HCI_UART;
155961e8	430	hci_set_drvdata(hdev, hu);
1da177e4 LT	431
	432	hdev->open = hci_uart_open;
	433	hdev->close = hci_uart_close;
	434	hdev->flush = hci_uart_flush;
	435	hdev->send = hci_uart_send_frame;
6935e0f5	436	SET_HCIDEV_DEV(hdev, hu->tty->dev);
1da177e4	437
63c7d09c JH	438	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
	439	set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
	440
a55e1f38	441	if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
a6c511c6	442	set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
a55e1f38	443
8a7a3fd6 MH	444	if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
	445	hdev->dev_type = HCI_AMP;
	446	else
	447	hdev->dev_type = HCI_BREDR;
	448
9f2aee84 JH	449	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	450	return 0;
	451
1da177e4 LT	452	if (hci_register_dev(hdev) < 0) {
	453	BT_ERR("Can't register HCI device");
	454	hci_free_dev(hdev);
	455	return -ENODEV;
	456	}
	457
9f2aee84 JH	458	set_bit(HCI_UART_REGISTERED, &hu->flags);
9f2aee84 JH	459
1da177e4 LT	460	return 0;
	461	}
	462
	463	static int hci_uart_set_proto(struct hci_uart *hu, int id)
	464	{
	465	struct hci_uart_proto *p;
0372a662 MH	466	int err;
0372a662 MH	467
1da177e4 LT	468	p = hci_uart_get_proto(id);
	469	if (!p)
	470	return -EPROTONOSUPPORT;
	471
	472	err = p->open(hu);
	473	if (err)
	474	return err;
	475
	476	hu->proto = p;
	477
	478	err = hci_uart_register_dev(hu);
	479	if (err) {
	480	p->close(hu);
	481	return err;
	482	}
0372a662	483
1da177e4 LT	484	return 0;
	485	}
	486
	487	/* hci_uart_tty_ioctl()
	488	*
	489	* Process IOCTL system call for the tty device.
	490	*
	491	* Arguments:
	492	*
	493	* tty pointer to tty instance data
	494	* file pointer to open file object for device
	495	* cmd IOCTL command code
	496	* arg argument for IOCTL call (cmd dependent)
	497	*
	498	* Return Value: Command dependent
	499	*/
	500	static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,
0372a662	501	unsigned int cmd, unsigned long arg)
1da177e4 LT	502	{
	503	struct hci_uart hu = (void )tty->disc_data;
	504	int err = 0;
	505
	506	BT_DBG("");
	507
	508	/* Verify the status of the device */
	509	if (!hu)
	510	return -EBADF;
	511
	512	switch (cmd) {
	513	case HCIUARTSETPROTO:
	514	if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	515	err = hci_uart_set_proto(hu, arg);
	516	if (err) {
	517	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
	518	return err;
	519	}
0372a662	520	} else
1da177e4	521	return -EBUSY;
c33be3c3	522	break;
1da177e4 LT	523
	524	case HCIUARTGETPROTO:
	525	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	526	return hu->proto->id;
	527	return -EUNATCH;
0372a662	528
d2158744 MH	529	case HCIUARTGETDEVICE:
	530	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	531	return hu->hdev->id;
	532	return -EUNATCH;
	533
63c7d09c JH	534	case HCIUARTSETFLAGS:
	535	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	536	return -EBUSY;
	537	hu->hdev_flags = arg;
	538	break;
	539
	540	case HCIUARTGETFLAGS:
	541	return hu->hdev_flags;
	542
1da177e4	543	default:
47afa7a5	544	err = n_tty_ioctl_helper(tty, file, cmd, arg);
1da177e4	545	break;
a20890d0	546	}
1da177e4 LT	547
	548	return err;
	549	}
	550
	551	/*
	552	* We don't provide read/write/poll interface for user space.
	553	*/
0372a662 MH	554	static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,
0372a662 MH	555	unsigned char __user *buf, size_t nr)
1da177e4 LT	556	{
	557	return 0;
	558	}
0372a662 MH	559
	560	static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,
	561	const unsigned char *data, size_t count)
1da177e4 LT	562	{
	563	return 0;
	564	}
0372a662 MH	565
	566	static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
	567	struct file filp, poll_table wait)
1da177e4 LT	568	{
	569	return 0;
	570	}
	571
1da177e4 LT	572	static int __init hci_uart_init(void)
1da177e4 LT	573	{
a352def2	574	static struct tty_ldisc_ops hci_uart_ldisc;
1da177e4 LT	575	int err;
	576
	577	BT_INFO("HCI UART driver ver %s", VERSION);
	578
	579	/* Register the tty discipline */
	580
	581	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
0372a662 MH	582	hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
	583	hci_uart_ldisc.name = "n_hci";
	584	hci_uart_ldisc.open = hci_uart_tty_open;
	585	hci_uart_ldisc.close = hci_uart_tty_close;
	586	hci_uart_ldisc.read = hci_uart_tty_read;
	587	hci_uart_ldisc.write = hci_uart_tty_write;
	588	hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
	589	hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662 MH	590	hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
	591	hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
	592	hci_uart_ldisc.owner = THIS_MODULE;
1da177e4 LT	593
	594	if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
	595	BT_ERR("HCI line discipline registration failed. (%d)", err);
	596	return err;
	597	}
	598
	599	#ifdef CONFIG_BT_HCIUART_H4
	600	h4_init();
	601	#endif
	602	#ifdef CONFIG_BT_HCIUART_BCSP
	603	bcsp_init();
	604	#endif
166d2f6a OBC	605	#ifdef CONFIG_BT_HCIUART_LL
	606	ll_init();
	607	#endif
b3190df6 SS	608	#ifdef CONFIG_BT_HCIUART_ATH3K
	609	ath_init();
	610	#endif
7dec65c8 JH	611	#ifdef CONFIG_BT_HCIUART_3WIRE
	612	h5_init();
	613	#endif
166d2f6a	614
1da177e4 LT	615	return 0;
	616	}
	617
	618	static void __exit hci_uart_exit(void)
	619	{
	620	int err;
	621
	622	#ifdef CONFIG_BT_HCIUART_H4
	623	h4_deinit();
	624	#endif
	625	#ifdef CONFIG_BT_HCIUART_BCSP
	626	bcsp_deinit();
	627	#endif
166d2f6a OBC	628	#ifdef CONFIG_BT_HCIUART_LL
	629	ll_deinit();
	630	#endif
b3190df6 SS	631	#ifdef CONFIG_BT_HCIUART_ATH3K
	632	ath_deinit();
	633	#endif
7dec65c8 JH	634	#ifdef CONFIG_BT_HCIUART_3WIRE
	635	h5_deinit();
	636	#endif
1da177e4 LT	637
1da177e4 LT	638	/* Release tty registration of line discipline */
64ccd715	639	if ((err = tty_unregister_ldisc(N_HCI)))
1da177e4 LT	640	BT_ERR("Can't unregister HCI line discipline (%d)", err);
	641	}
	642
	643	module_init(hci_uart_init);
	644	module_exit(hci_uart_exit);
	645
63fbd24e	646	MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4 LT	647	MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
	648	MODULE_VERSION(VERSION);
	649	MODULE_LICENSE("GPL");
	650	MODULE_ALIAS_LDISC(N_HCI);