[linux.git] / drivers / bluetooth / hci_ldisc.c

/*
 *
 *  Bluetooth HCI UART driver
 *
 *  Copyright (C) 2000-2001  Qualcomm Incorporated
 *  Copyright (C) 2002-2003  Maxim Krasnyansky <[email protected]>
 *  Copyright (C) 2004-2005  Marcel Holtmann <[email protected]>
 *
 *
 *  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 hci_dev *hdev, struct sk_buff *skb)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);

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

	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;

	hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
	if (!hu) {
		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_EXT_CONFIG, &hu->hdev_flags))
		set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &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;
}

static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
{
	unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
				    BIT(HCI_UART_RESET_ON_INIT) |
				    BIT(HCI_UART_CREATE_AMP) |
				    BIT(HCI_UART_INIT_PENDING) |
				    BIT(HCI_UART_EXT_CONFIG);

	if ((flags & ~valid_flags))
		return -EINVAL;

	hu->hdev_flags = flags;

	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_REGISTERED, &hu->flags))
			return hu->hdev->id;
		return -EUNATCH;

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

	err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
	if (err) {
		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 */
	err = tty_unregister_ldisc(N_HCI);
	if (err)
		BT_ERR("Can't unregister HCI line discipline (%d)", err);
}

module_init(hci_uart_init);
module_exit(hci_uart_exit);

MODULE_AUTHOR("Marcel Holtmann <[email protected]>");
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 <[email protected]>
	7	* Copyright (C) 2004-2005 Marcel Holtmann <[email protected]>
	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
da64c27d 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 */
7bd8f09f	248	static int hci_uart_send_frame(struct hci_dev hdev, struct sk_buff skb)
1da177e4	249	{
52bc423a	250	struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4 LT	251
	252	if (!test_bit(HCI_RUNNING, &hdev->flags))
	253	return -EBUSY;
	254
0d48d939	255	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1da177e4 LT	256
	257	hu->proto->enqueue(hu, skb);
	258
	259	hci_uart_tx_wakeup(hu);
0372a662	260
1da177e4 LT	261	return 0;
	262	}
	263
1da177e4 LT	264	/* ------ LDISC part ------ */
1da177e4 LT	265	/* hci_uart_tty_open
1687dfc3	266	*
1da177e4 LT	267	* Called when line discipline changed to HCI_UART.
	268	*
	269	* Arguments:
	270	* tty pointer to tty info structure
1687dfc3	271	* Return Value:
1da177e4 LT	272	* 0 if success, otherwise error code
	273	*/
	274	static int hci_uart_tty_open(struct tty_struct *tty)
	275	{
f327b340	276	struct hci_uart *hu;
1da177e4 LT	277
	278	BT_DBG("tty %p", tty);
	279
c19483cc AC	280	/* Error if the tty has no write op instead of leaving an exploitable
	281	hole */
	282	if (tty->ops->write == NULL)
	283	return -EOPNOTSUPP;
	284
a08b15e6 VI	285	hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
a08b15e6 VI	286	if (!hu) {
7785162c	287	BT_ERR("Can't allocate control structure");
1da177e4 LT	288	return -ENFILE;
1da177e4 LT	289	}
0372a662	290
1da177e4 LT	291	tty->disc_data = hu;
1da177e4 LT	292	hu->tty = tty;
33f0f88f	293	tty->receive_room = 65536;
1da177e4	294
9f2aee84	295	INIT_WORK(&hu->init_ready, hci_uart_init_work);
da64c27d	296	INIT_WORK(&hu->write_work, hci_uart_write_work);
9f2aee84	297
1da177e4 LT	298	spin_lock_init(&hu->rx_lock);
	299
	300	/* Flush any pending characters in the driver and line discipline. */
0372a662	301
1da177e4 LT	302	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
1da177e4 LT	303	open path is before the ldisc is referencable */
0372a662	304
c65c9bc3 AC	305	if (tty->ldisc->ops->flush_buffer)
c65c9bc3 AC	306	tty->ldisc->ops->flush_buffer(tty);
f34d7a5b	307	tty_driver_flush_buffer(tty);
1da177e4 LT	308
	309	return 0;
	310	}
	311
	312	/* hci_uart_tty_close()
	313	*
	314	* Called when the line discipline is changed to something
	315	* else, the tty is closed, or the tty detects a hangup.
	316	*/
	317	static void hci_uart_tty_close(struct tty_struct *tty)
	318	{
	319	struct hci_uart hu = (void )tty->disc_data;
dac670b9	320	struct hci_dev *hdev;
1da177e4 LT	321
	322	BT_DBG("tty %p", tty);
	323
	324	/* Detach from the tty */
	325	tty->disc_data = NULL;
	326
dac670b9 JH	327	if (!hu)
dac670b9 JH	328	return;
22ad4203	329
dac670b9 JH	330	hdev = hu->hdev;
	331	if (hdev)
	332	hci_uart_close(hdev);
1da177e4	333
da64c27d FB	334	cancel_work_sync(&hu->write_work);
da64c27d FB	335
dac670b9 JH	336	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
dac670b9 JH	337	if (hdev) {
9f2aee84 JH	338	if (test_bit(HCI_UART_REGISTERED, &hu->flags))
9f2aee84 JH	339	hci_unregister_dev(hdev);
dac670b9	340	hci_free_dev(hdev);
1da177e4	341	}
dac670b9	342	hu->proto->close(hu);
1da177e4	343	}
dac670b9 JH	344
dac670b9 JH	345	kfree(hu);
1da177e4 LT	346	}
	347
	348	/* hci_uart_tty_wakeup()
	349	*
	350	* Callback for transmit wakeup. Called when low level
	351	* device driver can accept more send data.
	352	*
	353	* Arguments: tty pointer to associated tty instance data
	354	* Return Value: None
	355	*/
	356	static void hci_uart_tty_wakeup(struct tty_struct *tty)
	357	{
	358	struct hci_uart hu = (void )tty->disc_data;
	359
	360	BT_DBG("");
	361
	362	if (!hu)
	363	return;
	364
	365	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	366
	367	if (tty != hu->tty)
	368	return;
	369
	370	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	371	hci_uart_tx_wakeup(hu);
	372	}
	373
1da177e4	374	/* hci_uart_tty_receive()
1687dfc3	375	*
1da177e4 LT	376	* Called by tty low level driver when receive data is
1da177e4 LT	377	* available.
1687dfc3	378	*
1da177e4 LT	379	* Arguments: tty pointer to tty isntance data
	380	* data pointer to received data
	381	* flags pointer to flags for data
	382	* count count of received data in bytes
1687dfc3	383	*
55db4c64	384	* Return Value: None
1da177e4	385	*/
55db4c64	386	static void hci_uart_tty_receive(struct tty_struct tty, const u8 data, char *flags, int count)
1da177e4 LT	387	{
1da177e4 LT	388	struct hci_uart hu = (void )tty->disc_data;
0372a662	389
1da177e4	390	if (!hu \|\| tty != hu->tty)
55db4c64	391	return;
1da177e4 LT	392
1da177e4 LT	393	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
55db4c64	394	return;
0372a662	395
1da177e4	396	spin_lock(&hu->rx_lock);
55db4c64	397	hu->proto->recv(hu, (void *) data, count);
788f0923 CP	398
	399	if (hu->hdev)
	400	hu->hdev->stat.byte_rx += count;
	401
1da177e4 LT	402	spin_unlock(&hu->rx_lock);
1da177e4 LT	403
39c2e60f	404	tty_unthrottle(tty);
1da177e4 LT	405	}
	406
	407	static int hci_uart_register_dev(struct hci_uart *hu)
	408	{
	409	struct hci_dev *hdev;
	410
	411	BT_DBG("");
	412
	413	/* Initialize and register HCI device */
	414	hdev = hci_alloc_dev();
	415	if (!hdev) {
	416	BT_ERR("Can't allocate HCI device");
	417	return -ENOMEM;
	418	}
	419
	420	hu->hdev = hdev;
	421
c13854ce	422	hdev->bus = HCI_UART;
155961e8	423	hci_set_drvdata(hdev, hu);
1da177e4 LT	424
	425	hdev->open = hci_uart_open;
	426	hdev->close = hci_uart_close;
	427	hdev->flush = hci_uart_flush;
	428	hdev->send = hci_uart_send_frame;
6935e0f5	429	SET_HCIDEV_DEV(hdev, hu->tty->dev);
1da177e4	430
63c7d09c JH	431	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
	432	set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
	433
6afd04ad MH	434	if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
	435	set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
	436
a55e1f38	437	if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
a6c511c6	438	set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
a55e1f38	439
8a7a3fd6 MH	440	if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
	441	hdev->dev_type = HCI_AMP;
	442	else
	443	hdev->dev_type = HCI_BREDR;
	444
9f2aee84 JH	445	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	446	return 0;
	447
1da177e4 LT	448	if (hci_register_dev(hdev) < 0) {
	449	BT_ERR("Can't register HCI device");
	450	hci_free_dev(hdev);
	451	return -ENODEV;
	452	}
	453
9f2aee84 JH	454	set_bit(HCI_UART_REGISTERED, &hu->flags);
9f2aee84 JH	455
1da177e4 LT	456	return 0;
	457	}
	458
	459	static int hci_uart_set_proto(struct hci_uart *hu, int id)
	460	{
	461	struct hci_uart_proto *p;
0372a662 MH	462	int err;
0372a662 MH	463
1da177e4 LT	464	p = hci_uart_get_proto(id);
	465	if (!p)
	466	return -EPROTONOSUPPORT;
	467
	468	err = p->open(hu);
	469	if (err)
	470	return err;
	471
	472	hu->proto = p;
	473
	474	err = hci_uart_register_dev(hu);
	475	if (err) {
	476	p->close(hu);
	477	return err;
	478	}
0372a662	479
1da177e4 LT	480	return 0;
	481	}
	482
bb72bd68 MH	483	static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
	484	{
	485	unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) \|
	486	BIT(HCI_UART_RESET_ON_INIT) \|
	487	BIT(HCI_UART_CREATE_AMP) \|
6afd04ad MH	488	BIT(HCI_UART_INIT_PENDING) \|
6afd04ad MH	489	BIT(HCI_UART_EXT_CONFIG);
bb72bd68 MH	490
	491	if ((flags & ~valid_flags))
	492	return -EINVAL;
	493
	494	hu->hdev_flags = flags;
	495
	496	return 0;
	497	}
	498
1da177e4 LT	499	/* hci_uart_tty_ioctl()
	500	*
	501	* Process IOCTL system call for the tty device.
	502	*
	503	* Arguments:
	504	*
	505	* tty pointer to tty instance data
	506	* file pointer to open file object for device
	507	* cmd IOCTL command code
	508	* arg argument for IOCTL call (cmd dependent)
	509	*
	510	* Return Value: Command dependent
	511	*/
	512	static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,
0372a662	513	unsigned int cmd, unsigned long arg)
1da177e4 LT	514	{
	515	struct hci_uart hu = (void )tty->disc_data;
	516	int err = 0;
	517
	518	BT_DBG("");
	519
	520	/* Verify the status of the device */
	521	if (!hu)
	522	return -EBADF;
	523
	524	switch (cmd) {
	525	case HCIUARTSETPROTO:
	526	if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	527	err = hci_uart_set_proto(hu, arg);
	528	if (err) {
	529	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
	530	return err;
	531	}
0372a662	532	} else
1da177e4	533	return -EBUSY;
c33be3c3	534	break;
1da177e4 LT	535
	536	case HCIUARTGETPROTO:
	537	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	538	return hu->proto->id;
	539	return -EUNATCH;
0372a662	540
d2158744	541	case HCIUARTGETDEVICE:
c7e0c141	542	if (test_bit(HCI_UART_REGISTERED, &hu->flags))
d2158744 MH	543	return hu->hdev->id;
	544	return -EUNATCH;
	545
63c7d09c JH	546	case HCIUARTSETFLAGS:
	547	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	548	return -EBUSY;
bb72bd68 MH	549	err = hci_uart_set_flags(hu, arg);
	550	if (err)
	551	return err;
63c7d09c JH	552	break;
	553
	554	case HCIUARTGETFLAGS:
	555	return hu->hdev_flags;
	556
1da177e4	557	default:
47afa7a5	558	err = n_tty_ioctl_helper(tty, file, cmd, arg);
1da177e4	559	break;
a20890d0	560	}
1da177e4 LT	561
	562	return err;
	563	}
	564
	565	/*
	566	* We don't provide read/write/poll interface for user space.
	567	*/
0372a662 MH	568	static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,
0372a662 MH	569	unsigned char __user *buf, size_t nr)
1da177e4 LT	570	{
	571	return 0;
	572	}
0372a662 MH	573
	574	static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,
	575	const unsigned char *data, size_t count)
1da177e4 LT	576	{
	577	return 0;
	578	}
0372a662 MH	579
	580	static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
	581	struct file filp, poll_table wait)
1da177e4 LT	582	{
	583	return 0;
	584	}
	585
1da177e4 LT	586	static int __init hci_uart_init(void)
1da177e4 LT	587	{
a352def2	588	static struct tty_ldisc_ops hci_uart_ldisc;
1da177e4 LT	589	int err;
	590
	591	BT_INFO("HCI UART driver ver %s", VERSION);
	592
	593	/* Register the tty discipline */
	594
	595	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
0372a662 MH	596	hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
	597	hci_uart_ldisc.name = "n_hci";
	598	hci_uart_ldisc.open = hci_uart_tty_open;
	599	hci_uart_ldisc.close = hci_uart_tty_close;
	600	hci_uart_ldisc.read = hci_uart_tty_read;
	601	hci_uart_ldisc.write = hci_uart_tty_write;
	602	hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
	603	hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662 MH	604	hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
	605	hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
	606	hci_uart_ldisc.owner = THIS_MODULE;
1da177e4	607
a08b15e6 VI	608	err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
a08b15e6 VI	609	if (err) {
1da177e4 LT	610	BT_ERR("HCI line discipline registration failed. (%d)", err);
	611	return err;
	612	}
	613
	614	#ifdef CONFIG_BT_HCIUART_H4
	615	h4_init();
	616	#endif
	617	#ifdef CONFIG_BT_HCIUART_BCSP
	618	bcsp_init();
	619	#endif
166d2f6a OBC	620	#ifdef CONFIG_BT_HCIUART_LL
	621	ll_init();
	622	#endif
b3190df6 SS	623	#ifdef CONFIG_BT_HCIUART_ATH3K
	624	ath_init();
	625	#endif
7dec65c8 JH	626	#ifdef CONFIG_BT_HCIUART_3WIRE
	627	h5_init();
	628	#endif
166d2f6a	629
1da177e4 LT	630	return 0;
	631	}
	632
	633	static void __exit hci_uart_exit(void)
	634	{
	635	int err;
	636
	637	#ifdef CONFIG_BT_HCIUART_H4
	638	h4_deinit();
	639	#endif
	640	#ifdef CONFIG_BT_HCIUART_BCSP
	641	bcsp_deinit();
	642	#endif
166d2f6a OBC	643	#ifdef CONFIG_BT_HCIUART_LL
	644	ll_deinit();
	645	#endif
b3190df6 SS	646	#ifdef CONFIG_BT_HCIUART_ATH3K
	647	ath_deinit();
	648	#endif
7dec65c8 JH	649	#ifdef CONFIG_BT_HCIUART_3WIRE
	650	h5_deinit();
	651	#endif
1da177e4 LT	652
1da177e4 LT	653	/* Release tty registration of line discipline */
a08b15e6 VI	654	err = tty_unregister_ldisc(N_HCI);
a08b15e6 VI	655	if (err)
1da177e4 LT	656	BT_ERR("Can't unregister HCI line discipline (%d)", err);
	657	}
	658
	659	module_init(hci_uart_init);
	660	module_exit(hci_uart_exit);
	661
63fbd24e	662	MODULE_AUTHOR("Marcel Holtmann <[email protected]>");
1da177e4 LT	663	MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
	664	MODULE_VERSION(VERSION);
	665	MODULE_LICENSE("GPL");
	666	MODULE_ALIAS_LDISC(N_HCI);