[linux-block.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"

#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)
{
	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;
		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;

	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
	
	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>
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);
	211	return 0;
	212	}
	213
	214	/* Send frames from HCI layer */
	215	static int hci_uart_send_frame(struct sk_buff *skb)
	216	{
	217	struct hci_dev* hdev = (struct hci_dev *) skb->dev;
	218	struct tty_struct *tty;
	219	struct hci_uart *hu;
	220
	221	if (!hdev) {
	222	BT_ERR("Frame for uknown device (hdev=NULL)");
	223	return -ENODEV;
	224	}
	225
	226	if (!test_bit(HCI_RUNNING, &hdev->flags))
	227	return -EBUSY;
	228
	229	hu = (struct hci_uart *) hdev->driver_data;
	230	tty = hu->tty;
	231
0d48d939	232	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1da177e4 LT	233
	234	hu->proto->enqueue(hu, skb);
	235
	236	hci_uart_tx_wakeup(hu);
0372a662	237
1da177e4 LT	238	return 0;
	239	}
	240
	241	static void hci_uart_destruct(struct hci_dev *hdev)
	242	{
0372a662 MH	243	if (!hdev)
0372a662 MH	244	return;
1da177e4 LT	245
1da177e4 LT	246	BT_DBG("%s", hdev->name);
7785162c	247	kfree(hdev->driver_data);
1da177e4 LT	248	}
	249
	250	/* ------ LDISC part ------ */
	251	/* hci_uart_tty_open
	252	*
	253	* Called when line discipline changed to HCI_UART.
	254	*
	255	* Arguments:
	256	* tty pointer to tty info structure
	257	* Return Value:
	258	* 0 if success, otherwise error code
	259	*/
	260	static int hci_uart_tty_open(struct tty_struct *tty)
	261	{
	262	struct hci_uart hu = (void ) tty->disc_data;
	263
	264	BT_DBG("tty %p", tty);
	265
	266	if (hu)
	267	return -EEXIST;
	268
089b1dbb	269	if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
7785162c	270	BT_ERR("Can't allocate control structure");
1da177e4 LT	271	return -ENFILE;
1da177e4 LT	272	}
0372a662	273
1da177e4 LT	274	tty->disc_data = hu;
1da177e4 LT	275	hu->tty = tty;
33f0f88f	276	tty->receive_room = 65536;
1da177e4 LT	277
	278	spin_lock_init(&hu->rx_lock);
	279
	280	/* Flush any pending characters in the driver and line discipline. */
0372a662	281
1da177e4 LT	282	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
1da177e4 LT	283	open path is before the ldisc is referencable */
0372a662	284
1da177e4 LT	285	if (tty->ldisc.flush_buffer)
	286	tty->ldisc.flush_buffer(tty);
	287
420cc350	288	if (tty->driver && tty->driver->flush_buffer)
1da177e4 LT	289	tty->driver->flush_buffer(tty);
	290
	291	return 0;
	292	}
	293
	294	/* hci_uart_tty_close()
	295	*
	296	* Called when the line discipline is changed to something
	297	* else, the tty is closed, or the tty detects a hangup.
	298	*/
	299	static void hci_uart_tty_close(struct tty_struct *tty)
	300	{
	301	struct hci_uart hu = (void )tty->disc_data;
	302
	303	BT_DBG("tty %p", tty);
	304
	305	/* Detach from the tty */
	306	tty->disc_data = NULL;
	307
	308	if (hu) {
	309	struct hci_dev *hdev = hu->hdev;
	310	hci_uart_close(hdev);
	311
	312	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	313	hu->proto->close(hu);
	314	hci_unregister_dev(hdev);
	315	hci_free_dev(hdev);
	316	}
	317	}
	318	}
	319
	320	/* hci_uart_tty_wakeup()
	321	*
	322	* Callback for transmit wakeup. Called when low level
	323	* device driver can accept more send data.
	324	*
	325	* Arguments: tty pointer to associated tty instance data
	326	* Return Value: None
	327	*/
	328	static void hci_uart_tty_wakeup(struct tty_struct *tty)
	329	{
	330	struct hci_uart hu = (void )tty->disc_data;
	331
	332	BT_DBG("");
	333
	334	if (!hu)
	335	return;
	336
	337	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	338
	339	if (tty != hu->tty)
	340	return;
	341
	342	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	343	hci_uart_tx_wakeup(hu);
	344	}
	345
1da177e4 LT	346	/* hci_uart_tty_receive()
	347	*
	348	* Called by tty low level driver when receive data is
	349	* available.
	350	*
	351	* Arguments: tty pointer to tty isntance data
	352	* data pointer to received data
	353	* flags pointer to flags for data
	354	* count count of received data in bytes
	355	*
	356	* Return Value: None
	357	*/
7785162c	358	static void hci_uart_tty_receive(struct tty_struct tty, const u8 data, char *flags, int count)
1da177e4 LT	359	{
1da177e4 LT	360	struct hci_uart hu = (void )tty->disc_data;
0372a662	361
1da177e4 LT	362	if (!hu \|\| tty != hu->tty)
	363	return;
	364
	365	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
	366	return;
0372a662	367
1da177e4 LT	368	spin_lock(&hu->rx_lock);
	369	hu->proto->recv(hu, (void *) data, count);
	370	hu->hdev->stat.byte_rx += count;
	371	spin_unlock(&hu->rx_lock);
	372
7785162c MH	373	if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
7785162c MH	374	tty->driver->unthrottle)
1da177e4 LT	375	tty->driver->unthrottle(tty);
	376	}
	377
	378	static int hci_uart_register_dev(struct hci_uart *hu)
	379	{
	380	struct hci_dev *hdev;
	381
	382	BT_DBG("");
	383
	384	/* Initialize and register HCI device */
	385	hdev = hci_alloc_dev();
	386	if (!hdev) {
	387	BT_ERR("Can't allocate HCI device");
	388	return -ENOMEM;
	389	}
	390
	391	hu->hdev = hdev;
	392
	393	hdev->type = HCI_UART;
	394	hdev->driver_data = hu;
	395
	396	hdev->open = hci_uart_open;
	397	hdev->close = hci_uart_close;
	398	hdev->flush = hci_uart_flush;
	399	hdev->send = hci_uart_send_frame;
	400	hdev->destruct = hci_uart_destruct;
	401
	402	hdev->owner = THIS_MODULE;
	403
	404	if (reset)
	405	set_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks);
	406
	407	if (hci_register_dev(hdev) < 0) {
	408	BT_ERR("Can't register HCI device");
	409	hci_free_dev(hdev);
	410	return -ENODEV;
	411	}
	412
	413	return 0;
	414	}
	415
	416	static int hci_uart_set_proto(struct hci_uart *hu, int id)
	417	{
	418	struct hci_uart_proto *p;
0372a662 MH	419	int err;
0372a662 MH	420
1da177e4 LT	421	p = hci_uart_get_proto(id);
	422	if (!p)
	423	return -EPROTONOSUPPORT;
	424
	425	err = p->open(hu);
	426	if (err)
	427	return err;
	428
	429	hu->proto = p;
	430
	431	err = hci_uart_register_dev(hu);
	432	if (err) {
	433	p->close(hu);
	434	return err;
	435	}
0372a662	436
1da177e4 LT	437	return 0;
	438	}
	439
	440	/* hci_uart_tty_ioctl()
	441	*
	442	* Process IOCTL system call for the tty device.
	443	*
	444	* Arguments:
	445	*
	446	* tty pointer to tty instance data
	447	* file pointer to open file object for device
	448	* cmd IOCTL command code
	449	* arg argument for IOCTL call (cmd dependent)
	450	*
	451	* Return Value: Command dependent
	452	*/
	453	static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,
0372a662	454	unsigned int cmd, unsigned long arg)
1da177e4 LT	455	{
	456	struct hci_uart hu = (void )tty->disc_data;
	457	int err = 0;
	458
	459	BT_DBG("");
	460
	461	/* Verify the status of the device */
	462	if (!hu)
	463	return -EBADF;
	464
	465	switch (cmd) {
	466	case HCIUARTSETPROTO:
	467	if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	468	err = hci_uart_set_proto(hu, arg);
	469	if (err) {
	470	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
	471	return err;
	472	}
	473	tty->low_latency = 1;
0372a662	474	} else
1da177e4 LT	475	return -EBUSY;
	476
	477	case HCIUARTGETPROTO:
	478	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	479	return hu->proto->id;
	480	return -EUNATCH;
0372a662	481
d2158744 MH	482	case HCIUARTGETDEVICE:
	483	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	484	return hu->hdev->id;
	485	return -EUNATCH;
	486
1da177e4 LT	487	default:
	488	err = n_tty_ioctl(tty, file, cmd, arg);
	489	break;
	490	};
	491
	492	return err;
	493	}
	494
	495	/*
	496	* We don't provide read/write/poll interface for user space.
	497	*/
0372a662 MH	498	static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,
0372a662 MH	499	unsigned char __user *buf, size_t nr)
1da177e4 LT	500	{
	501	return 0;
	502	}
0372a662 MH	503
	504	static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,
	505	const unsigned char *data, size_t count)
1da177e4 LT	506	{
	507	return 0;
	508	}
0372a662 MH	509
	510	static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
	511	struct file filp, poll_table wait)
1da177e4 LT	512	{
	513	return 0;
	514	}
	515
1da177e4 LT	516	static int __init hci_uart_init(void)
	517	{
	518	static struct tty_ldisc hci_uart_ldisc;
	519	int err;
	520
	521	BT_INFO("HCI UART driver ver %s", VERSION);
	522
	523	/* Register the tty discipline */
	524
	525	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
0372a662 MH	526	hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
	527	hci_uart_ldisc.name = "n_hci";
	528	hci_uart_ldisc.open = hci_uart_tty_open;
	529	hci_uart_ldisc.close = hci_uart_tty_close;
	530	hci_uart_ldisc.read = hci_uart_tty_read;
	531	hci_uart_ldisc.write = hci_uart_tty_write;
	532	hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
	533	hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662 MH	534	hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
	535	hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
	536	hci_uart_ldisc.owner = THIS_MODULE;
1da177e4 LT	537
	538	if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
	539	BT_ERR("HCI line discipline registration failed. (%d)", err);
	540	return err;
	541	}
	542
	543	#ifdef CONFIG_BT_HCIUART_H4
	544	h4_init();
	545	#endif
	546	#ifdef CONFIG_BT_HCIUART_BCSP
	547	bcsp_init();
	548	#endif
	549
	550	return 0;
	551	}
	552
	553	static void __exit hci_uart_exit(void)
	554	{
	555	int err;
	556
	557	#ifdef CONFIG_BT_HCIUART_H4
	558	h4_deinit();
	559	#endif
	560	#ifdef CONFIG_BT_HCIUART_BCSP
	561	bcsp_deinit();
	562	#endif
	563
	564	/* Release tty registration of line discipline */
64ccd715	565	if ((err = tty_unregister_ldisc(N_HCI)))
1da177e4 LT	566	BT_ERR("Can't unregister HCI line discipline (%d)", err);
	567	}
	568
	569	module_init(hci_uart_init);
	570	module_exit(hci_uart_exit);
	571
	572	module_param(reset, bool, 0644);
	573	MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
	574
	575	MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
	576	MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
	577	MODULE_VERSION(VERSION);
	578	MODULE_LICENSE("GPL");
	579	MODULE_ALIAS_LDISC(N_HCI);