[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"

#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);
	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 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)
{
	if (!hdev)
		return;

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

/* ------ 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 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.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;

		if (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;
		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;

	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
#ifdef CONFIG_BT_HCIUART_LL
	ll_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

	/* 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 <[email protected]>, 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
	49	#ifndef CONFIG_BT_HCIUART_DEBUG
	50	#undef BT_DBG
	51	#define BT_DBG( A... )
1da177e4 LT	52	#endif
1da177e4 LT	53
0372a662 MH	54	#define VERSION "2.2"
0372a662 MH	55
1da177e4 LT	56	static int reset = 0;
	57
	58	static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
	59
	60	int hci_uart_register_proto(struct hci_uart_proto *p)
	61	{
	62	if (p->id >= HCI_UART_MAX_PROTO)
	63	return -EINVAL;
	64
	65	if (hup[p->id])
	66	return -EEXIST;
	67
	68	hup[p->id] = p;
0372a662	69
1da177e4 LT	70	return 0;
	71	}
	72
	73	int hci_uart_unregister_proto(struct hci_uart_proto *p)
	74	{
	75	if (p->id >= HCI_UART_MAX_PROTO)
	76	return -EINVAL;
	77
	78	if (!hup[p->id])
	79	return -EINVAL;
	80
	81	hup[p->id] = NULL;
0372a662	82
1da177e4 LT	83	return 0;
	84	}
	85
	86	static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
	87	{
	88	if (id >= HCI_UART_MAX_PROTO)
	89	return NULL;
0372a662	90
1da177e4 LT	91	return hup[id];
	92	}
	93
	94	static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
	95	{
	96	struct hci_dev *hdev = hu->hdev;
0372a662	97
1da177e4 LT	98	/* Update HCI stat counters */
	99	switch (pkt_type) {
	100	case HCI_COMMAND_PKT:
	101	hdev->stat.cmd_tx++;
	102	break;
	103
	104	case HCI_ACLDATA_PKT:
	105	hdev->stat.acl_tx++;
	106	break;
	107
	108	case HCI_SCODATA_PKT:
	109	hdev->stat.cmd_tx++;
	110	break;
	111	}
	112	}
	113
	114	static inline struct sk_buff hci_uart_dequeue(struct hci_uart hu)
	115	{
	116	struct sk_buff *skb = hu->tx_skb;
0372a662	117
1da177e4 LT	118	if (!skb)
	119	skb = hu->proto->dequeue(hu);
	120	else
	121	hu->tx_skb = NULL;
0372a662	122
1da177e4 LT	123	return skb;
	124	}
	125
	126	int hci_uart_tx_wakeup(struct hci_uart *hu)
	127	{
	128	struct tty_struct *tty = hu->tty;
	129	struct hci_dev *hdev = hu->hdev;
	130	struct sk_buff *skb;
0372a662	131
1da177e4 LT	132	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
	133	set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	134	return 0;
	135	}
	136
	137	BT_DBG("");
	138
	139	restart:
	140	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	141
	142	while ((skb = hci_uart_dequeue(hu))) {
	143	int len;
0372a662	144
1da177e4 LT	145	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	146	len = tty->driver->write(tty, skb->data, skb->len);
	147	hdev->stat.byte_tx += len;
	148
	149	skb_pull(skb, len);
	150	if (skb->len) {
	151	hu->tx_skb = skb;
	152	break;
	153	}
0372a662	154
0d48d939	155	hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
1da177e4	156	kfree_skb(skb);
0372a662 MH	157	}
0372a662 MH	158
1da177e4 LT	159	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
	160	goto restart;
	161
	162	clear_bit(HCI_UART_SENDING, &hu->tx_state);
	163	return 0;
	164	}
	165
	166	/* ------- Interface to HCI layer ------ */
	167	/* Initialize device */
	168	static int hci_uart_open(struct hci_dev *hdev)
	169	{
	170	BT_DBG("%s %p", hdev->name, hdev);
	171
	172	/* Nothing to do for UART driver */
	173
	174	set_bit(HCI_RUNNING, &hdev->flags);
0372a662	175
1da177e4 LT	176	return 0;
	177	}
	178
	179	/* Reset device */
	180	static int hci_uart_flush(struct hci_dev *hdev)
	181	{
	182	struct hci_uart hu = (struct hci_uart ) hdev->driver_data;
	183	struct tty_struct *tty = hu->tty;
	184
	185	BT_DBG("hdev %p tty %p", hdev, tty);
	186
	187	if (hu->tx_skb) {
	188	kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
	189	}
	190
	191	/* Flush any pending characters in the driver and discipline. */
	192	tty_ldisc_flush(tty);
420cc350	193	if (tty->driver && tty->driver->flush_buffer)
1da177e4 LT	194	tty->driver->flush_buffer(tty);
	195
	196	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	197	hu->proto->flush(hu);
	198
	199	return 0;
	200	}
	201
	202	/* Close device */
	203	static int hci_uart_close(struct hci_dev *hdev)
	204	{
	205	BT_DBG("hdev %p", hdev);
	206
	207	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
	208	return 0;
	209
	210	hci_uart_flush(hdev);
3611f4d2	211	hdev->flush = NULL;
1da177e4 LT	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	{
0372a662 MH	244	if (!hdev)
0372a662 MH	245	return;
1da177e4 LT	246
1da177e4 LT	247	BT_DBG("%s", hdev->name);
7785162c	248	kfree(hdev->driver_data);
1da177e4 LT	249	}
	250
	251	/* ------ LDISC part ------ */
	252	/* hci_uart_tty_open
	253	*
	254	* Called when line discipline changed to HCI_UART.
	255	*
	256	* Arguments:
	257	* tty pointer to tty info structure
	258	* Return Value:
	259	* 0 if success, otherwise error code
	260	*/
	261	static int hci_uart_tty_open(struct tty_struct *tty)
	262	{
	263	struct hci_uart hu = (void ) tty->disc_data;
	264
	265	BT_DBG("tty %p", tty);
	266
	267	if (hu)
	268	return -EEXIST;
	269
089b1dbb	270	if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
7785162c	271	BT_ERR("Can't allocate control structure");
1da177e4 LT	272	return -ENFILE;
1da177e4 LT	273	}
0372a662	274
1da177e4 LT	275	tty->disc_data = hu;
1da177e4 LT	276	hu->tty = tty;
33f0f88f	277	tty->receive_room = 65536;
1da177e4 LT	278
	279	spin_lock_init(&hu->rx_lock);
	280
	281	/* Flush any pending characters in the driver and line discipline. */
0372a662	282
1da177e4 LT	283	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
1da177e4 LT	284	open path is before the ldisc is referencable */
0372a662	285
1da177e4 LT	286	if (tty->ldisc.flush_buffer)
	287	tty->ldisc.flush_buffer(tty);
	288
420cc350	289	if (tty->driver && tty->driver->flush_buffer)
1da177e4 LT	290	tty->driver->flush_buffer(tty);
	291
	292	return 0;
	293	}
	294
	295	/* hci_uart_tty_close()
	296	*
	297	* Called when the line discipline is changed to something
	298	* else, the tty is closed, or the tty detects a hangup.
	299	*/
	300	static void hci_uart_tty_close(struct tty_struct *tty)
	301	{
	302	struct hci_uart hu = (void )tty->disc_data;
	303
	304	BT_DBG("tty %p", tty);
	305
	306	/* Detach from the tty */
	307	tty->disc_data = NULL;
	308
	309	if (hu) {
	310	struct hci_dev *hdev = hu->hdev;
22ad4203 MH	311
	312	if (hdev)
	313	hci_uart_close(hdev);
1da177e4 LT	314
	315	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	316	hu->proto->close(hu);
	317	hci_unregister_dev(hdev);
	318	hci_free_dev(hdev);
	319	}
	320	}
	321	}
	322
	323	/* hci_uart_tty_wakeup()
	324	*
	325	* Callback for transmit wakeup. Called when low level
	326	* device driver can accept more send data.
	327	*
	328	* Arguments: tty pointer to associated tty instance data
	329	* Return Value: None
	330	*/
	331	static void hci_uart_tty_wakeup(struct tty_struct *tty)
	332	{
	333	struct hci_uart hu = (void )tty->disc_data;
	334
	335	BT_DBG("");
	336
	337	if (!hu)
	338	return;
	339
	340	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	341
	342	if (tty != hu->tty)
	343	return;
	344
	345	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	346	hci_uart_tx_wakeup(hu);
	347	}
	348
1da177e4 LT	349	/* hci_uart_tty_receive()
	350	*
	351	* Called by tty low level driver when receive data is
	352	* available.
	353	*
	354	* Arguments: tty pointer to tty isntance data
	355	* data pointer to received data
	356	* flags pointer to flags for data
	357	* count count of received data in bytes
	358	*
	359	* Return Value: None
	360	*/
7785162c	361	static void hci_uart_tty_receive(struct tty_struct tty, const u8 data, char *flags, int count)
1da177e4 LT	362	{
1da177e4 LT	363	struct hci_uart hu = (void )tty->disc_data;
0372a662	364
1da177e4 LT	365	if (!hu \|\| tty != hu->tty)
	366	return;
	367
	368	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
	369	return;
0372a662	370
1da177e4 LT	371	spin_lock(&hu->rx_lock);
	372	hu->proto->recv(hu, (void *) data, count);
	373	hu->hdev->stat.byte_rx += count;
	374	spin_unlock(&hu->rx_lock);
	375
7785162c MH	376	if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
7785162c MH	377	tty->driver->unthrottle)
1da177e4 LT	378	tty->driver->unthrottle(tty);
	379	}
	380
	381	static int hci_uart_register_dev(struct hci_uart *hu)
	382	{
	383	struct hci_dev *hdev;
	384
	385	BT_DBG("");
	386
	387	/* Initialize and register HCI device */
	388	hdev = hci_alloc_dev();
	389	if (!hdev) {
	390	BT_ERR("Can't allocate HCI device");
	391	return -ENOMEM;
	392	}
	393
	394	hu->hdev = hdev;
	395
	396	hdev->type = HCI_UART;
	397	hdev->driver_data = hu;
	398
	399	hdev->open = hci_uart_open;
	400	hdev->close = hci_uart_close;
	401	hdev->flush = hci_uart_flush;
	402	hdev->send = hci_uart_send_frame;
	403	hdev->destruct = hci_uart_destruct;
	404
	405	hdev->owner = THIS_MODULE;
	406
	407	if (reset)
	408	set_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks);
	409
	410	if (hci_register_dev(hdev) < 0) {
	411	BT_ERR("Can't register HCI device");
	412	hci_free_dev(hdev);
	413	return -ENODEV;
	414	}
	415
	416	return 0;
	417	}
	418
	419	static int hci_uart_set_proto(struct hci_uart *hu, int id)
	420	{
	421	struct hci_uart_proto *p;
0372a662 MH	422	int err;
0372a662 MH	423
1da177e4 LT	424	p = hci_uart_get_proto(id);
	425	if (!p)
	426	return -EPROTONOSUPPORT;
	427
	428	err = p->open(hu);
	429	if (err)
	430	return err;
	431
	432	hu->proto = p;
	433
	434	err = hci_uart_register_dev(hu);
	435	if (err) {
	436	p->close(hu);
	437	return err;
	438	}
0372a662	439
1da177e4 LT	440	return 0;
	441	}
	442
	443	/* hci_uart_tty_ioctl()
	444	*
	445	* Process IOCTL system call for the tty device.
	446	*
	447	* Arguments:
	448	*
	449	* tty pointer to tty instance data
	450	* file pointer to open file object for device
	451	* cmd IOCTL command code
	452	* arg argument for IOCTL call (cmd dependent)
	453	*
	454	* Return Value: Command dependent
	455	*/
	456	static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,
0372a662	457	unsigned int cmd, unsigned long arg)
1da177e4 LT	458	{
	459	struct hci_uart hu = (void )tty->disc_data;
	460	int err = 0;
	461
	462	BT_DBG("");
	463
	464	/* Verify the status of the device */
	465	if (!hu)
	466	return -EBADF;
	467
	468	switch (cmd) {
	469	case HCIUARTSETPROTO:
	470	if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	471	err = hci_uart_set_proto(hu, arg);
	472	if (err) {
	473	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
	474	return err;
	475	}
	476	tty->low_latency = 1;
0372a662	477	} else
1da177e4	478	return -EBUSY;
c33be3c3	479	break;
1da177e4 LT	480
	481	case HCIUARTGETPROTO:
	482	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	483	return hu->proto->id;
	484	return -EUNATCH;
0372a662	485
d2158744 MH	486	case HCIUARTGETDEVICE:
	487	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	488	return hu->hdev->id;
	489	return -EUNATCH;
	490
1da177e4 LT	491	default:
	492	err = n_tty_ioctl(tty, file, cmd, arg);
	493	break;
	494	};
	495
	496	return err;
	497	}
	498
	499	/*
	500	* We don't provide read/write/poll interface for user space.
	501	*/
0372a662 MH	502	static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,
0372a662 MH	503	unsigned char __user *buf, size_t nr)
1da177e4 LT	504	{
	505	return 0;
	506	}
0372a662 MH	507
	508	static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,
	509	const unsigned char *data, size_t count)
1da177e4 LT	510	{
	511	return 0;
	512	}
0372a662 MH	513
	514	static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
	515	struct file filp, poll_table wait)
1da177e4 LT	516	{
	517	return 0;
	518	}
	519
1da177e4 LT	520	static int __init hci_uart_init(void)
	521	{
	522	static struct tty_ldisc hci_uart_ldisc;
	523	int err;
	524
	525	BT_INFO("HCI UART driver ver %s", VERSION);
	526
	527	/* Register the tty discipline */
	528
	529	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
0372a662 MH	530	hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
	531	hci_uart_ldisc.name = "n_hci";
	532	hci_uart_ldisc.open = hci_uart_tty_open;
	533	hci_uart_ldisc.close = hci_uart_tty_close;
	534	hci_uart_ldisc.read = hci_uart_tty_read;
	535	hci_uart_ldisc.write = hci_uart_tty_write;
	536	hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
	537	hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662 MH	538	hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
	539	hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
	540	hci_uart_ldisc.owner = THIS_MODULE;
1da177e4 LT	541
	542	if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
	543	BT_ERR("HCI line discipline registration failed. (%d)", err);
	544	return err;
	545	}
	546
	547	#ifdef CONFIG_BT_HCIUART_H4
	548	h4_init();
	549	#endif
	550	#ifdef CONFIG_BT_HCIUART_BCSP
	551	bcsp_init();
	552	#endif
166d2f6a OBC	553	#ifdef CONFIG_BT_HCIUART_LL
	554	ll_init();
	555	#endif
	556
1da177e4 LT	557	return 0;
	558	}
	559
	560	static void __exit hci_uart_exit(void)
	561	{
	562	int err;
	563
	564	#ifdef CONFIG_BT_HCIUART_H4
	565	h4_deinit();
	566	#endif
	567	#ifdef CONFIG_BT_HCIUART_BCSP
	568	bcsp_deinit();
	569	#endif
166d2f6a OBC	570	#ifdef CONFIG_BT_HCIUART_LL
	571	ll_deinit();
	572	#endif
1da177e4 LT	573
1da177e4 LT	574	/* Release tty registration of line discipline */
64ccd715	575	if ((err = tty_unregister_ldisc(N_HCI)))
1da177e4 LT	576	BT_ERR("Can't unregister HCI line discipline (%d)", err);
	577	}
	578
	579	module_init(hci_uart_init);
	580	module_exit(hci_uart_exit);
	581
	582	module_param(reset, bool, 0644);
	583	MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
	584
	585	MODULE_AUTHOR("Maxim Krasnyansky <[email protected]>, Marcel Holtmann <[email protected]>");
	586	MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
	587	MODULE_VERSION(VERSION);
	588	MODULE_LICENSE("GPL");
	589	MODULE_ALIAS_LDISC(N_HCI);