[deliverable/linux.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/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/poll.h>

#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/signal.h>
#include <linux/ioctl.h>
#include <linux/skbuff.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#include "hci_uart.h"

#ifndef CONFIG_BT_HCIUART_DEBUG
#undef  BT_DBG
#define BT_DBG( A... )
#endif

#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.cmd_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->driver->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);
	if (tty->driver && tty->driver->flush_buffer)
		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);
	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 tty_struct *tty;
	struct hci_uart *hu;

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

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

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

	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;
}

static void hci_uart_destruct(struct hci_dev *hdev)
{
	struct hci_uart *hu;

	if (!hdev)
		return;

	BT_DBG("%s", hdev->name);

	hu = (struct hci_uart *) hdev->driver_data;
	kfree(hu);
}

/* ------ 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);

	if (hu)
		return -EEXIST;

	if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
		BT_ERR("Can't allocate controll 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.flush_buffer)
		tty->ldisc.flush_buffer(tty);

	if (tty->driver && tty->driver->flush_buffer)
		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;
		hci_uart_close(hdev);

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

/* 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);

	if (test_and_clear_bit(TTY_THROTTLED,&tty->flags) && tty->driver->unthrottle)
		tty->driver->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->type = 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->destruct = hci_uart_destruct;

	hdev->owner = THIS_MODULE;

	if (reset)
		set_bit(HCI_QUIRK_RESET_ON_INIT, &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;
			}
			tty->low_latency = 1;
		} else
			return -EBUSY;

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

	default:
		err = n_tty_ioctl(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 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
	
	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

	/* 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("Maxim Krasnyansky <maxk@qualcomm.com>, 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>
	30	#include <linux/sched.h>
	31	#include <linux/types.h>
	32	#include <linux/fcntl.h>
	33	#include <linux/interrupt.h>
	34	#include <linux/ptrace.h>
	35	#include <linux/poll.h>
	36
	37	#include <linux/slab.h>
	38	#include <linux/tty.h>
	39	#include <linux/errno.h>
	40	#include <linux/string.h>
	41	#include <linux/signal.h>
	42	#include <linux/ioctl.h>
	43	#include <linux/skbuff.h>
	44
	45	#include <net/bluetooth/bluetooth.h>
	46	#include <net/bluetooth/hci_core.h>
	47
	48	#include "hci_uart.h"
	49
	50	#ifndef CONFIG_BT_HCIUART_DEBUG
	51	#undef BT_DBG
	52	#define BT_DBG( A... )
1da177e4 LT	53	#endif
1da177e4 LT	54
0372a662 MH	55	#define VERSION "2.2"
0372a662 MH	56
1da177e4 LT	57	static int reset = 0;
	58
	59	static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
	60
	61	int hci_uart_register_proto(struct hci_uart_proto *p)
	62	{
	63	if (p->id >= HCI_UART_MAX_PROTO)
	64	return -EINVAL;
	65
	66	if (hup[p->id])
	67	return -EEXIST;
	68
	69	hup[p->id] = p;
0372a662	70
1da177e4 LT	71	return 0;
	72	}
	73
	74	int hci_uart_unregister_proto(struct hci_uart_proto *p)
	75	{
	76	if (p->id >= HCI_UART_MAX_PROTO)
	77	return -EINVAL;
	78
	79	if (!hup[p->id])
	80	return -EINVAL;
	81
	82	hup[p->id] = NULL;
0372a662	83
1da177e4 LT	84	return 0;
	85	}
	86
	87	static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
	88	{
	89	if (id >= HCI_UART_MAX_PROTO)
	90	return NULL;
0372a662	91
1da177e4 LT	92	return hup[id];
	93	}
	94
	95	static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
	96	{
	97	struct hci_dev *hdev = hu->hdev;
0372a662	98
1da177e4 LT	99	/* Update HCI stat counters */
	100	switch (pkt_type) {
	101	case HCI_COMMAND_PKT:
	102	hdev->stat.cmd_tx++;
	103	break;
	104
	105	case HCI_ACLDATA_PKT:
	106	hdev->stat.acl_tx++;
	107	break;
	108
	109	case HCI_SCODATA_PKT:
	110	hdev->stat.cmd_tx++;
	111	break;
	112	}
	113	}
	114
	115	static inline struct sk_buff hci_uart_dequeue(struct hci_uart hu)
	116	{
	117	struct sk_buff *skb = hu->tx_skb;
0372a662	118
1da177e4 LT	119	if (!skb)
	120	skb = hu->proto->dequeue(hu);
	121	else
	122	hu->tx_skb = NULL;
0372a662	123
1da177e4 LT	124	return skb;
	125	}
	126
	127	int hci_uart_tx_wakeup(struct hci_uart *hu)
	128	{
	129	struct tty_struct *tty = hu->tty;
	130	struct hci_dev *hdev = hu->hdev;
	131	struct sk_buff *skb;
0372a662	132
1da177e4 LT	133	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
	134	set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	135	return 0;
	136	}
	137
	138	BT_DBG("");
	139
	140	restart:
	141	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	142
	143	while ((skb = hci_uart_dequeue(hu))) {
	144	int len;
0372a662	145
1da177e4 LT	146	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	147	len = tty->driver->write(tty, skb->data, skb->len);
	148	hdev->stat.byte_tx += len;
	149
	150	skb_pull(skb, len);
	151	if (skb->len) {
	152	hu->tx_skb = skb;
	153	break;
	154	}
0372a662	155
0d48d939	156	hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
1da177e4	157	kfree_skb(skb);
0372a662 MH	158	}
0372a662 MH	159
1da177e4 LT	160	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
	161	goto restart;
	162
	163	clear_bit(HCI_UART_SENDING, &hu->tx_state);
	164	return 0;
	165	}
	166
	167	/* ------- Interface to HCI layer ------ */
	168	/* Initialize device */
	169	static int hci_uart_open(struct hci_dev *hdev)
	170	{
	171	BT_DBG("%s %p", hdev->name, hdev);
	172
	173	/* Nothing to do for UART driver */
	174
	175	set_bit(HCI_RUNNING, &hdev->flags);
0372a662	176
1da177e4 LT	177	return 0;
	178	}
	179
	180	/* Reset device */
	181	static int hci_uart_flush(struct hci_dev *hdev)
	182	{
	183	struct hci_uart hu = (struct hci_uart ) hdev->driver_data;
	184	struct tty_struct *tty = hu->tty;
	185
	186	BT_DBG("hdev %p tty %p", hdev, tty);
	187
	188	if (hu->tx_skb) {
	189	kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
	190	}
	191
	192	/* Flush any pending characters in the driver and discipline. */
	193	tty_ldisc_flush(tty);
420cc350	194	if (tty->driver && tty->driver->flush_buffer)
1da177e4 LT	195	tty->driver->flush_buffer(tty);
	196
	197	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	198	hu->proto->flush(hu);
	199
	200	return 0;
	201	}
	202
	203	/* Close device */
	204	static int hci_uart_close(struct hci_dev *hdev)
	205	{
	206	BT_DBG("hdev %p", hdev);
	207
	208	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
	209	return 0;
	210
	211	hci_uart_flush(hdev);
	212	return 0;
	213	}
	214
	215	/* Send frames from HCI layer */
	216	static int hci_uart_send_frame(struct sk_buff *skb)
	217	{
	218	struct hci_dev* hdev = (struct hci_dev *) skb->dev;
	219	struct tty_struct *tty;
	220	struct hci_uart *hu;
	221
	222	if (!hdev) {
	223	BT_ERR("Frame for uknown device (hdev=NULL)");
	224	return -ENODEV;
	225	}
	226
	227	if (!test_bit(HCI_RUNNING, &hdev->flags))
	228	return -EBUSY;
	229
	230	hu = (struct hci_uart *) hdev->driver_data;
	231	tty = hu->tty;
	232
0d48d939	233	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1da177e4 LT	234
	235	hu->proto->enqueue(hu, skb);
	236
	237	hci_uart_tx_wakeup(hu);
0372a662	238
1da177e4 LT	239	return 0;
	240	}
	241
	242	static void hci_uart_destruct(struct hci_dev *hdev)
	243	{
	244	struct hci_uart *hu;
	245
0372a662 MH	246	if (!hdev)
0372a662 MH	247	return;
1da177e4 LT	248
	249	BT_DBG("%s", hdev->name);
	250
	251	hu = (struct hci_uart *) hdev->driver_data;
	252	kfree(hu);
	253	}
	254
	255	/* ------ LDISC part ------ */
	256	/* hci_uart_tty_open
	257	*
	258	* Called when line discipline changed to HCI_UART.
	259	*
	260	* Arguments:
	261	* tty pointer to tty info structure
	262	* Return Value:
	263	* 0 if success, otherwise error code
	264	*/
	265	static int hci_uart_tty_open(struct tty_struct *tty)
	266	{
	267	struct hci_uart hu = (void ) tty->disc_data;
	268
	269	BT_DBG("tty %p", tty);
	270
	271	if (hu)
	272	return -EEXIST;
	273
089b1dbb	274	if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
1da177e4 LT	275	BT_ERR("Can't allocate controll structure");
	276	return -ENFILE;
	277	}
0372a662	278
1da177e4 LT	279	tty->disc_data = hu;
1da177e4 LT	280	hu->tty = tty;
33f0f88f	281	tty->receive_room = 65536;
1da177e4 LT	282
	283	spin_lock_init(&hu->rx_lock);
	284
	285	/* Flush any pending characters in the driver and line discipline. */
0372a662	286
1da177e4 LT	287	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
1da177e4 LT	288	open path is before the ldisc is referencable */
0372a662	289
1da177e4 LT	290	if (tty->ldisc.flush_buffer)
	291	tty->ldisc.flush_buffer(tty);
	292
420cc350	293	if (tty->driver && tty->driver->flush_buffer)
1da177e4 LT	294	tty->driver->flush_buffer(tty);
	295
	296	return 0;
	297	}
	298
	299	/* hci_uart_tty_close()
	300	*
	301	* Called when the line discipline is changed to something
	302	* else, the tty is closed, or the tty detects a hangup.
	303	*/
	304	static void hci_uart_tty_close(struct tty_struct *tty)
	305	{
	306	struct hci_uart hu = (void )tty->disc_data;
	307
	308	BT_DBG("tty %p", tty);
	309
	310	/* Detach from the tty */
	311	tty->disc_data = NULL;
	312
	313	if (hu) {
	314	struct hci_dev *hdev = hu->hdev;
	315	hci_uart_close(hdev);
	316
	317	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	318	hu->proto->close(hu);
	319	hci_unregister_dev(hdev);
	320	hci_free_dev(hdev);
	321	}
	322	}
	323	}
	324
	325	/* hci_uart_tty_wakeup()
	326	*
	327	* Callback for transmit wakeup. Called when low level
	328	* device driver can accept more send data.
	329	*
	330	* Arguments: tty pointer to associated tty instance data
	331	* Return Value: None
	332	*/
	333	static void hci_uart_tty_wakeup(struct tty_struct *tty)
	334	{
	335	struct hci_uart hu = (void )tty->disc_data;
	336
	337	BT_DBG("");
	338
	339	if (!hu)
	340	return;
	341
	342	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	343
	344	if (tty != hu->tty)
	345	return;
	346
	347	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	348	hci_uart_tx_wakeup(hu);
	349	}
	350
1da177e4 LT	351	/* hci_uart_tty_receive()
	352	*
	353	* Called by tty low level driver when receive data is
	354	* available.
	355	*
	356	* Arguments: tty pointer to tty isntance data
	357	* data pointer to received data
	358	* flags pointer to flags for data
	359	* count count of received data in bytes
	360	*
	361	* Return Value: None
	362	*/
	363	static void hci_uart_tty_receive(struct tty_struct tty, const __u8 data, char *flags, int count)
	364	{
	365	struct hci_uart hu = (void )tty->disc_data;
0372a662	366
1da177e4 LT	367	if (!hu \|\| tty != hu->tty)
	368	return;
	369
	370	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
	371	return;
0372a662	372
1da177e4 LT	373	spin_lock(&hu->rx_lock);
	374	hu->proto->recv(hu, (void *) data, count);
	375	hu->hdev->stat.byte_rx += count;
	376	spin_unlock(&hu->rx_lock);
	377
	378	if (test_and_clear_bit(TTY_THROTTLED,&tty->flags) && tty->driver->unthrottle)
	379	tty->driver->unthrottle(tty);
	380	}
	381
	382	static int hci_uart_register_dev(struct hci_uart *hu)
	383	{
	384	struct hci_dev *hdev;
	385
	386	BT_DBG("");
	387
	388	/* Initialize and register HCI device */
	389	hdev = hci_alloc_dev();
	390	if (!hdev) {
	391	BT_ERR("Can't allocate HCI device");
	392	return -ENOMEM;
	393	}
	394
	395	hu->hdev = hdev;
	396
	397	hdev->type = HCI_UART;
	398	hdev->driver_data = hu;
	399
	400	hdev->open = hci_uart_open;
	401	hdev->close = hci_uart_close;
	402	hdev->flush = hci_uart_flush;
	403	hdev->send = hci_uart_send_frame;
	404	hdev->destruct = hci_uart_destruct;
	405
	406	hdev->owner = THIS_MODULE;
	407
	408	if (reset)
	409	set_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks);
	410
	411	if (hci_register_dev(hdev) < 0) {
	412	BT_ERR("Can't register HCI device");
	413	hci_free_dev(hdev);
	414	return -ENODEV;
	415	}
	416
	417	return 0;
	418	}
	419
	420	static int hci_uart_set_proto(struct hci_uart *hu, int id)
	421	{
	422	struct hci_uart_proto *p;
0372a662 MH	423	int err;
0372a662 MH	424
1da177e4 LT	425	p = hci_uart_get_proto(id);
	426	if (!p)
	427	return -EPROTONOSUPPORT;
	428
	429	err = p->open(hu);
	430	if (err)
	431	return err;
	432
	433	hu->proto = p;
	434
	435	err = hci_uart_register_dev(hu);
	436	if (err) {
	437	p->close(hu);
	438	return err;
	439	}
0372a662	440
1da177e4 LT	441	return 0;
	442	}
	443
	444	/* hci_uart_tty_ioctl()
	445	*
	446	* Process IOCTL system call for the tty device.
	447	*
	448	* Arguments:
	449	*
	450	* tty pointer to tty instance data
	451	* file pointer to open file object for device
	452	* cmd IOCTL command code
	453	* arg argument for IOCTL call (cmd dependent)
	454	*
	455	* Return Value: Command dependent
	456	*/
	457	static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,
0372a662	458	unsigned int cmd, unsigned long arg)
1da177e4 LT	459	{
	460	struct hci_uart hu = (void )tty->disc_data;
	461	int err = 0;
	462
	463	BT_DBG("");
	464
	465	/* Verify the status of the device */
	466	if (!hu)
	467	return -EBADF;
	468
	469	switch (cmd) {
	470	case HCIUARTSETPROTO:
	471	if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	472	err = hci_uart_set_proto(hu, arg);
	473	if (err) {
	474	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
	475	return err;
	476	}
	477	tty->low_latency = 1;
0372a662	478	} else
1da177e4 LT	479	return -EBUSY;
	480
	481	case HCIUARTGETPROTO:
	482	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	483	return hu->proto->id;
	484	return -EUNATCH;
0372a662	485
1da177e4 LT	486	default:
	487	err = n_tty_ioctl(tty, file, cmd, arg);
	488	break;
	489	};
	490
	491	return err;
	492	}
	493
	494	/*
	495	* We don't provide read/write/poll interface for user space.
	496	*/
0372a662 MH	497	static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,
0372a662 MH	498	unsigned char __user *buf, size_t nr)
1da177e4 LT	499	{
	500	return 0;
	501	}
0372a662 MH	502
	503	static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,
	504	const unsigned char *data, size_t count)
1da177e4 LT	505	{
	506	return 0;
	507	}
0372a662 MH	508
	509	static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
	510	struct file filp, poll_table wait)
1da177e4 LT	511	{
	512	return 0;
	513	}
	514
1da177e4 LT	515	static int __init hci_uart_init(void)
	516	{
	517	static struct tty_ldisc hci_uart_ldisc;
	518	int err;
	519
	520	BT_INFO("HCI UART driver ver %s", VERSION);
	521
	522	/* Register the tty discipline */
	523
	524	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
0372a662 MH	525	hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
	526	hci_uart_ldisc.name = "n_hci";
	527	hci_uart_ldisc.open = hci_uart_tty_open;
	528	hci_uart_ldisc.close = hci_uart_tty_close;
	529	hci_uart_ldisc.read = hci_uart_tty_read;
	530	hci_uart_ldisc.write = hci_uart_tty_write;
	531	hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
	532	hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662 MH	533	hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
	534	hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
	535	hci_uart_ldisc.owner = THIS_MODULE;
1da177e4 LT	536
	537	if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
	538	BT_ERR("HCI line discipline registration failed. (%d)", err);
	539	return err;
	540	}
	541
	542	#ifdef CONFIG_BT_HCIUART_H4
	543	h4_init();
	544	#endif
	545	#ifdef CONFIG_BT_HCIUART_BCSP
	546	bcsp_init();
	547	#endif
	548
	549	return 0;
	550	}
	551
	552	static void __exit hci_uart_exit(void)
	553	{
	554	int err;
	555
	556	#ifdef CONFIG_BT_HCIUART_H4
	557	h4_deinit();
	558	#endif
	559	#ifdef CONFIG_BT_HCIUART_BCSP
	560	bcsp_deinit();
	561	#endif
	562
	563	/* Release tty registration of line discipline */
64ccd715	564	if ((err = tty_unregister_ldisc(N_HCI)))
1da177e4 LT	565	BT_ERR("Can't unregister HCI line discipline (%d)", err);
	566	}
	567
	568	module_init(hci_uart_init);
	569	module_exit(hci_uart_exit);
	570
	571	module_param(reset, bool, 0644);
	572	MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
	573
	574	MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
	575	MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
	576	MODULE_VERSION(VERSION);
	577	MODULE_LICENSE("GPL");
	578	MODULE_ALIAS_LDISC(N_HCI);