[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 int reset = 0;

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)
{
	struct tty_struct *tty = hu->tty;
	struct hci_dev *hdev = hu->hdev;
	struct sk_buff *skb;

	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
		set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
		return 0;
	}

	BT_DBG("");

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);
	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  = (struct hci_uart *) hdev->driver_data;
	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 = (struct hci_uart *) hdev->driver_data;

	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 = (void *) tty->disc_data;

	BT_DBG("tty %p", tty);

	/* FIXME: This btw is bogus, nothing requires the old ldisc to clear
	   the pointer */
	if (hu)
		return -EEXIST;

	/* 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;

	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;

	BT_DBG("tty %p", tty);

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

	if (hu) {
		struct hci_dev *hdev = hu->hdev;

		if (hdev)
			hci_uart_close(hdev);

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

		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);
	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;
	hdev->driver_data = hu;

	hdev->open  = hci_uart_open;
	hdev->close = hci_uart_close;
	hdev->flush = hci_uart_flush;
	hdev->send  = hci_uart_send_frame;
	hdev->parent = hu->tty->dev;

	if (!reset)
		set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);

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

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

	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

	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

	/* 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);
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 int reset = 0;
	52
	53	static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
	54
	55	int hci_uart_register_proto(struct hci_uart_proto *p)
	56	{
	57	if (p->id >= HCI_UART_MAX_PROTO)
	58	return -EINVAL;
	59
	60	if (hup[p->id])
	61	return -EEXIST;
	62
	63	hup[p->id] = p;
0372a662	64
1da177e4 LT	65	return 0;
	66	}
	67
	68	int hci_uart_unregister_proto(struct hci_uart_proto *p)
	69	{
	70	if (p->id >= HCI_UART_MAX_PROTO)
	71	return -EINVAL;
	72
	73	if (!hup[p->id])
	74	return -EINVAL;
	75
	76	hup[p->id] = NULL;
0372a662	77
1da177e4 LT	78	return 0;
	79	}
	80
	81	static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
	82	{
	83	if (id >= HCI_UART_MAX_PROTO)
	84	return NULL;
0372a662	85
1da177e4 LT	86	return hup[id];
	87	}
	88
	89	static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
	90	{
	91	struct hci_dev *hdev = hu->hdev;
0372a662	92
1da177e4 LT	93	/* Update HCI stat counters */
	94	switch (pkt_type) {
	95	case HCI_COMMAND_PKT:
	96	hdev->stat.cmd_tx++;
	97	break;
	98
	99	case HCI_ACLDATA_PKT:
	100	hdev->stat.acl_tx++;
	101	break;
	102
	103	case HCI_SCODATA_PKT:
7f8f2729	104	hdev->stat.sco_tx++;
1da177e4 LT	105	break;
	106	}
	107	}
	108
	109	static inline struct sk_buff hci_uart_dequeue(struct hci_uart hu)
	110	{
	111	struct sk_buff *skb = hu->tx_skb;
0372a662	112
1da177e4 LT	113	if (!skb)
	114	skb = hu->proto->dequeue(hu);
	115	else
	116	hu->tx_skb = NULL;
0372a662	117
1da177e4 LT	118	return skb;
	119	}
	120
	121	int hci_uart_tx_wakeup(struct hci_uart *hu)
	122	{
	123	struct tty_struct *tty = hu->tty;
	124	struct hci_dev *hdev = hu->hdev;
	125	struct sk_buff *skb;
0372a662	126
1da177e4 LT	127	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
	128	set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	129	return 0;
	130	}
	131
	132	BT_DBG("");
	133
	134	restart:
	135	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	136
	137	while ((skb = hci_uart_dequeue(hu))) {
	138	int len;
0372a662	139
1da177e4	140	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
f34d7a5b	141	len = tty->ops->write(tty, skb->data, skb->len);
1da177e4 LT	142	hdev->stat.byte_tx += len;
	143
	144	skb_pull(skb, len);
	145	if (skb->len) {
	146	hu->tx_skb = skb;
	147	break;
	148	}
0372a662	149
0d48d939	150	hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
1da177e4	151	kfree_skb(skb);
0372a662 MH	152	}
0372a662 MH	153
1da177e4 LT	154	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
	155	goto restart;
	156
	157	clear_bit(HCI_UART_SENDING, &hu->tx_state);
	158	return 0;
	159	}
	160
	161	/* ------- Interface to HCI layer ------ */
	162	/* Initialize device */
	163	static int hci_uart_open(struct hci_dev *hdev)
	164	{
	165	BT_DBG("%s %p", hdev->name, hdev);
	166
	167	/* Nothing to do for UART driver */
	168
	169	set_bit(HCI_RUNNING, &hdev->flags);
0372a662	170
1da177e4 LT	171	return 0;
	172	}
	173
	174	/* Reset device */
	175	static int hci_uart_flush(struct hci_dev *hdev)
	176	{
	177	struct hci_uart hu = (struct hci_uart ) hdev->driver_data;
	178	struct tty_struct *tty = hu->tty;
	179
	180	BT_DBG("hdev %p tty %p", hdev, tty);
	181
	182	if (hu->tx_skb) {
	183	kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
	184	}
	185
	186	/* Flush any pending characters in the driver and discipline. */
	187	tty_ldisc_flush(tty);
f34d7a5b	188	tty_driver_flush_buffer(tty);
1da177e4 LT	189
	190	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	191	hu->proto->flush(hu);
	192
	193	return 0;
	194	}
	195
	196	/* Close device */
	197	static int hci_uart_close(struct hci_dev *hdev)
	198	{
	199	BT_DBG("hdev %p", hdev);
	200
	201	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
	202	return 0;
	203
	204	hci_uart_flush(hdev);
3611f4d2	205	hdev->flush = NULL;
1da177e4 LT	206	return 0;
	207	}
	208
	209	/* Send frames from HCI layer */
	210	static int hci_uart_send_frame(struct sk_buff *skb)
	211	{
	212	struct hci_dev* hdev = (struct hci_dev *) skb->dev;
1da177e4 LT	213	struct hci_uart *hu;
	214
	215	if (!hdev) {
af901ca1	216	BT_ERR("Frame for unknown device (hdev=NULL)");
1da177e4 LT	217	return -ENODEV;
	218	}
	219
	220	if (!test_bit(HCI_RUNNING, &hdev->flags))
	221	return -EBUSY;
	222
	223	hu = (struct hci_uart *) hdev->driver_data;
1da177e4	224
0d48d939	225	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1da177e4 LT	226
	227	hu->proto->enqueue(hu, skb);
	228
	229	hci_uart_tx_wakeup(hu);
0372a662	230
1da177e4 LT	231	return 0;
	232	}
	233
1da177e4 LT	234	/* ------ LDISC part ------ */
	235	/* hci_uart_tty_open
	236	*
	237	* Called when line discipline changed to HCI_UART.
	238	*
	239	* Arguments:
	240	* tty pointer to tty info structure
	241	* Return Value:
	242	* 0 if success, otherwise error code
	243	*/
	244	static int hci_uart_tty_open(struct tty_struct *tty)
	245	{
	246	struct hci_uart hu = (void ) tty->disc_data;
	247
	248	BT_DBG("tty %p", tty);
	249
c19483cc AC	250	/* FIXME: This btw is bogus, nothing requires the old ldisc to clear
c19483cc AC	251	the pointer */
1da177e4 LT	252	if (hu)
	253	return -EEXIST;
	254
c19483cc AC	255	/* Error if the tty has no write op instead of leaving an exploitable
	256	hole */
	257	if (tty->ops->write == NULL)
	258	return -EOPNOTSUPP;
	259
089b1dbb	260	if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
7785162c	261	BT_ERR("Can't allocate control structure");
1da177e4 LT	262	return -ENFILE;
1da177e4 LT	263	}
0372a662	264
1da177e4 LT	265	tty->disc_data = hu;
1da177e4 LT	266	hu->tty = tty;
33f0f88f	267	tty->receive_room = 65536;
1da177e4 LT	268
	269	spin_lock_init(&hu->rx_lock);
	270
	271	/* Flush any pending characters in the driver and line discipline. */
0372a662	272
1da177e4 LT	273	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
1da177e4 LT	274	open path is before the ldisc is referencable */
0372a662	275
c65c9bc3 AC	276	if (tty->ldisc->ops->flush_buffer)
c65c9bc3 AC	277	tty->ldisc->ops->flush_buffer(tty);
f34d7a5b	278	tty_driver_flush_buffer(tty);
1da177e4 LT	279
	280	return 0;
	281	}
	282
	283	/* hci_uart_tty_close()
	284	*
	285	* Called when the line discipline is changed to something
	286	* else, the tty is closed, or the tty detects a hangup.
	287	*/
	288	static void hci_uart_tty_close(struct tty_struct *tty)
	289	{
	290	struct hci_uart hu = (void )tty->disc_data;
	291
	292	BT_DBG("tty %p", tty);
	293
	294	/* Detach from the tty */
	295	tty->disc_data = NULL;
	296
	297	if (hu) {
	298	struct hci_dev *hdev = hu->hdev;
22ad4203 MH	299
	300	if (hdev)
	301	hci_uart_close(hdev);
1da177e4 LT	302
	303	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	304	hu->proto->close(hu);
d9319560 JN	305	if (hdev) {
	306	hci_unregister_dev(hdev);
	307	hci_free_dev(hdev);
	308	}
1da177e4	309	}
797fe796 DH	310
797fe796 DH	311	kfree(hu);
1da177e4 LT	312	}
	313	}
	314
	315	/* hci_uart_tty_wakeup()
	316	*
	317	* Callback for transmit wakeup. Called when low level
	318	* device driver can accept more send data.
	319	*
	320	* Arguments: tty pointer to associated tty instance data
	321	* Return Value: None
	322	*/
	323	static void hci_uart_tty_wakeup(struct tty_struct *tty)
	324	{
	325	struct hci_uart hu = (void )tty->disc_data;
	326
	327	BT_DBG("");
	328
	329	if (!hu)
	330	return;
	331
	332	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	333
	334	if (tty != hu->tty)
	335	return;
	336
	337	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	338	hci_uart_tx_wakeup(hu);
	339	}
	340
1da177e4 LT	341	/* hci_uart_tty_receive()
	342	*
	343	* Called by tty low level driver when receive data is
	344	* available.
	345	*
	346	* Arguments: tty pointer to tty isntance data
	347	* data pointer to received data
	348	* flags pointer to flags for data
	349	* count count of received data in bytes
	350	*
55db4c64	351	* Return Value: None
1da177e4	352	*/
55db4c64	353	static void hci_uart_tty_receive(struct tty_struct tty, const u8 data, char *flags, int count)
1da177e4 LT	354	{
1da177e4 LT	355	struct hci_uart hu = (void )tty->disc_data;
0372a662	356
1da177e4	357	if (!hu \|\| tty != hu->tty)
55db4c64	358	return;
1da177e4 LT	359
1da177e4 LT	360	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
55db4c64	361	return;
0372a662	362
1da177e4	363	spin_lock(&hu->rx_lock);
55db4c64 LT	364	hu->proto->recv(hu, (void *) data, count);
55db4c64 LT	365	hu->hdev->stat.byte_rx += count;
1da177e4 LT	366	spin_unlock(&hu->rx_lock);
1da177e4 LT	367
39c2e60f	368	tty_unthrottle(tty);
1da177e4 LT	369	}
	370
	371	static int hci_uart_register_dev(struct hci_uart *hu)
	372	{
	373	struct hci_dev *hdev;
	374
	375	BT_DBG("");
	376
	377	/* Initialize and register HCI device */
	378	hdev = hci_alloc_dev();
	379	if (!hdev) {
	380	BT_ERR("Can't allocate HCI device");
	381	return -ENOMEM;
	382	}
	383
	384	hu->hdev = hdev;
	385
c13854ce	386	hdev->bus = HCI_UART;
1da177e4 LT	387	hdev->driver_data = hu;
	388
	389	hdev->open = hci_uart_open;
	390	hdev->close = hci_uart_close;
	391	hdev->flush = hci_uart_flush;
	392	hdev->send = hci_uart_send_frame;
7f4b2b04	393	hdev->parent = hu->tty->dev;
1da177e4	394
7a9d4020 MH	395	if (!reset)
7a9d4020 MH	396	set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
1da177e4	397
63c7d09c JH	398	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
	399	set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
	400
1da177e4 LT	401	if (hci_register_dev(hdev) < 0) {
	402	BT_ERR("Can't register HCI device");
	403	hci_free_dev(hdev);
	404	return -ENODEV;
	405	}
	406
	407	return 0;
	408	}
	409
	410	static int hci_uart_set_proto(struct hci_uart *hu, int id)
	411	{
	412	struct hci_uart_proto *p;
0372a662 MH	413	int err;
0372a662 MH	414
1da177e4 LT	415	p = hci_uart_get_proto(id);
	416	if (!p)
	417	return -EPROTONOSUPPORT;
	418
	419	err = p->open(hu);
	420	if (err)
	421	return err;
	422
	423	hu->proto = p;
	424
	425	err = hci_uart_register_dev(hu);
	426	if (err) {
	427	p->close(hu);
	428	return err;
	429	}
0372a662	430
1da177e4 LT	431	return 0;
	432	}
	433
	434	/* hci_uart_tty_ioctl()
	435	*
	436	* Process IOCTL system call for the tty device.
	437	*
	438	* Arguments:
	439	*
	440	* tty pointer to tty instance data
	441	* file pointer to open file object for device
	442	* cmd IOCTL command code
	443	* arg argument for IOCTL call (cmd dependent)
	444	*
	445	* Return Value: Command dependent
	446	*/
	447	static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,
0372a662	448	unsigned int cmd, unsigned long arg)
1da177e4 LT	449	{
	450	struct hci_uart hu = (void )tty->disc_data;
	451	int err = 0;
	452
	453	BT_DBG("");
	454
	455	/* Verify the status of the device */
	456	if (!hu)
	457	return -EBADF;
	458
	459	switch (cmd) {
	460	case HCIUARTSETPROTO:
	461	if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	462	err = hci_uart_set_proto(hu, arg);
	463	if (err) {
	464	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
	465	return err;
	466	}
0372a662	467	} else
1da177e4	468	return -EBUSY;
c33be3c3	469	break;
1da177e4 LT	470
	471	case HCIUARTGETPROTO:
	472	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	473	return hu->proto->id;
	474	return -EUNATCH;
0372a662	475
d2158744 MH	476	case HCIUARTGETDEVICE:
	477	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	478	return hu->hdev->id;
	479	return -EUNATCH;
	480
63c7d09c JH	481	case HCIUARTSETFLAGS:
	482	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	483	return -EBUSY;
	484	hu->hdev_flags = arg;
	485	break;
	486
	487	case HCIUARTGETFLAGS:
	488	return hu->hdev_flags;
	489
1da177e4	490	default:
47afa7a5	491	err = n_tty_ioctl_helper(tty, file, cmd, arg);
1da177e4 LT	492	break;
	493	};
	494
	495	return err;
	496	}
	497
	498	/*
	499	* We don't provide read/write/poll interface for user space.
	500	*/
0372a662 MH	501	static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,
0372a662 MH	502	unsigned char __user *buf, size_t nr)
1da177e4 LT	503	{
	504	return 0;
	505	}
0372a662 MH	506
	507	static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,
	508	const unsigned char *data, size_t count)
1da177e4 LT	509	{
	510	return 0;
	511	}
0372a662 MH	512
	513	static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
	514	struct file filp, poll_table wait)
1da177e4 LT	515	{
	516	return 0;
	517	}
	518
1da177e4 LT	519	static int __init hci_uart_init(void)
1da177e4 LT	520	{
a352def2	521	static struct tty_ldisc_ops hci_uart_ldisc;
1da177e4 LT	522	int err;
	523
	524	BT_INFO("HCI UART driver ver %s", VERSION);
	525
	526	/* Register the tty discipline */
	527
	528	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
0372a662 MH	529	hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
	530	hci_uart_ldisc.name = "n_hci";
	531	hci_uart_ldisc.open = hci_uart_tty_open;
	532	hci_uart_ldisc.close = hci_uart_tty_close;
	533	hci_uart_ldisc.read = hci_uart_tty_read;
	534	hci_uart_ldisc.write = hci_uart_tty_write;
	535	hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
	536	hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662 MH	537	hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
	538	hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
	539	hci_uart_ldisc.owner = THIS_MODULE;
1da177e4 LT	540
	541	if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
	542	BT_ERR("HCI line discipline registration failed. (%d)", err);
	543	return err;
	544	}
	545
	546	#ifdef CONFIG_BT_HCIUART_H4
	547	h4_init();
	548	#endif
	549	#ifdef CONFIG_BT_HCIUART_BCSP
	550	bcsp_init();
	551	#endif
166d2f6a OBC	552	#ifdef CONFIG_BT_HCIUART_LL
	553	ll_init();
	554	#endif
b3190df6 SS	555	#ifdef CONFIG_BT_HCIUART_ATH3K
	556	ath_init();
	557	#endif
166d2f6a	558
1da177e4 LT	559	return 0;
	560	}
	561
	562	static void __exit hci_uart_exit(void)
	563	{
	564	int err;
	565
	566	#ifdef CONFIG_BT_HCIUART_H4
	567	h4_deinit();
	568	#endif
	569	#ifdef CONFIG_BT_HCIUART_BCSP
	570	bcsp_deinit();
	571	#endif
166d2f6a OBC	572	#ifdef CONFIG_BT_HCIUART_LL
	573	ll_deinit();
	574	#endif
b3190df6 SS	575	#ifdef CONFIG_BT_HCIUART_ATH3K
	576	ath_deinit();
	577	#endif
1da177e4 LT	578
1da177e4 LT	579	/* Release tty registration of line discipline */
64ccd715	580	if ((err = tty_unregister_ldisc(N_HCI)))
1da177e4 LT	581	BT_ERR("Can't unregister HCI line discipline (%d)", err);
	582	}
	583
	584	module_init(hci_uart_init);
	585	module_exit(hci_uart_exit);
	586
	587	module_param(reset, bool, 0644);
	588	MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
	589
63fbd24e	590	MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4 LT	591	MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
	592	MODULE_VERSION(VERSION);
	593	MODULE_LICENSE("GPL");
	594	MODULE_ALIAS_LDISC(N_HCI);