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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [bluetooth/] [hci_ldisc.c] - Blame information for rev 67

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/*
 *
 *  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;
 
                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 <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);

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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [bluetooth/] [hci_ldisc.c] - Blame information for rev 67

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`*`
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			`*`
24			`*/`
25
26			`#include <linux/module.h>`
27
28			`#include <linux/kernel.h>`
29			`#include <linux/init.h>`
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... )`
52			`#endif`
53
54			`#define VERSION "2.2"`
55
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;`
69
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;`
82
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;`
90
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;`
97
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;`
117
118			`if (!skb)`
119			`skb = hu->proto->dequeue(hu);`
120			`else`
121			`hu->tx_skb = NULL;`
122
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;`
131
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;`
144
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			`}`
154
155			`hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);`
156			`kfree_skb(skb);`
157			`}`
158
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);`
175
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);`
193			`if (tty->driver && tty->driver->flush_buffer)`
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
232			`BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);`
233
234			`hu->proto->enqueue(hu, skb);`
235
236			`hci_uart_tx_wakeup(hu);`
237
238			`return 0;`
239			`}`
240
241			`static void hci_uart_destruct(struct hci_dev *hdev)`
242			`{`
243			`if (!hdev)`
244			`return;`
245
246			`BT_DBG("%s", hdev->name);`
247			`kfree(hdev->driver_data);`
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
269			`if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {`
270			`BT_ERR("Can't allocate control structure");`
271			`return -ENFILE;`
272			`}`
273
274			`tty->disc_data = hu;`
275			`hu->tty = tty;`
276			`tty->receive_room = 65536;`
277
278			`spin_lock_init(&hu->rx_lock);`
279
280			`/* Flush any pending characters in the driver and line discipline. */`
281
282			`/* FIXME: why is this needed. Note don't use ldisc_ref here as the`
283			`open path is before the ldisc is referencable */`
284
285			`if (tty->ldisc.flush_buffer)`
286			`tty->ldisc.flush_buffer(tty);`
287
288			`if (tty->driver && tty->driver->flush_buffer)`
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
311			`if (hdev)`
312			`hci_uart_close(hdev);`
313
314			`if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {`
315			`hu->proto->close(hu);`
316			`hci_unregister_dev(hdev);`
317			`hci_free_dev(hdev);`
318			`}`
319			`}`
320			`}`
321
322			`/* hci_uart_tty_wakeup()`
323			`*`
324			`* Callback for transmit wakeup. Called when low level`
325			`* device driver can accept more send data.`
326			`*`
327			`* Arguments: tty pointer to associated tty instance data`
328			`* Return Value: None`
329			`*/`
330			`static void hci_uart_tty_wakeup(struct tty_struct *tty)`
331			`{`
332			`struct hci_uart hu = (void )tty->disc_data;`
333
334			`BT_DBG("");`
335
336			`if (!hu)`
337			`return;`
338
339			`clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);`
340
341			`if (tty != hu->tty)`
342			`return;`
343
344			`if (test_bit(HCI_UART_PROTO_SET, &hu->flags))`
345			`hci_uart_tx_wakeup(hu);`
346			`}`
347
348			`/* hci_uart_tty_receive()`
349			`*`
350			`* Called by tty low level driver when receive data is`
351			`* available.`
352			`*`
353			`* Arguments: tty pointer to tty isntance data`
354			`* data pointer to received data`
355			`* flags pointer to flags for data`
356			`* count count of received data in bytes`
357			`*`
358			`* Return Value: None`
359			`*/`
360			`static void hci_uart_tty_receive(struct tty_struct tty, const u8 data, char *flags, int count)`
361			`{`
362			`struct hci_uart hu = (void )tty->disc_data;`
363
364			`if (!hu \|\| tty != hu->tty)`
365			`return;`
366
367			`if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))`
368			`return;`
369
370			`spin_lock(&hu->rx_lock);`
371			`hu->proto->recv(hu, (void *) data, count);`
372			`hu->hdev->stat.byte_rx += count;`
373			`spin_unlock(&hu->rx_lock);`
374
375			`if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&`
376			`tty->driver->unthrottle)`
377			`tty->driver->unthrottle(tty);`
378			`}`
379
380			`static int hci_uart_register_dev(struct hci_uart *hu)`
381			`{`
382			`struct hci_dev *hdev;`
383
384			`BT_DBG("");`
385
386			`/* Initialize and register HCI device */`
387			`hdev = hci_alloc_dev();`
388			`if (!hdev) {`
389			`BT_ERR("Can't allocate HCI device");`
390			`return -ENOMEM;`
391			`}`
392
393			`hu->hdev = hdev;`
394
395			`hdev->type = HCI_UART;`
396			`hdev->driver_data = hu;`
397
398			`hdev->open = hci_uart_open;`
399			`hdev->close = hci_uart_close;`
400			`hdev->flush = hci_uart_flush;`
401			`hdev->send = hci_uart_send_frame;`
402			`hdev->destruct = hci_uart_destruct;`
403
404			`hdev->owner = THIS_MODULE;`
405
406			`if (reset)`
407			`set_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks);`
408
409			`if (hci_register_dev(hdev) < 0) {`
410			`BT_ERR("Can't register HCI device");`
411			`hci_free_dev(hdev);`
412			`return -ENODEV;`
413			`}`
414
415			`return 0;`
416			`}`
417
418			`static int hci_uart_set_proto(struct hci_uart *hu, int id)`
419			`{`
420			`struct hci_uart_proto *p;`
421			`int err;`
422
423			`p = hci_uart_get_proto(id);`
424			`if (!p)`
425			`return -EPROTONOSUPPORT;`
426
427			`err = p->open(hu);`
428			`if (err)`
429			`return err;`
430
431			`hu->proto = p;`
432
433			`err = hci_uart_register_dev(hu);`
434			`if (err) {`
435			`p->close(hu);`
436			`return err;`
437			`}`
438
439			`return 0;`
440			`}`
441
442			`/* hci_uart_tty_ioctl()`
443			`*`
444			`* Process IOCTL system call for the tty device.`
445			`*`
446			`* Arguments:`
447			`*`
448			`* tty pointer to tty instance data`
449			`* file pointer to open file object for device`
450			`* cmd IOCTL command code`
451			`* arg argument for IOCTL call (cmd dependent)`
452			`*`
453			`* Return Value: Command dependent`
454			`*/`
455			`static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,`
456			`unsigned int cmd, unsigned long arg)`
457			`{`
458			`struct hci_uart hu = (void )tty->disc_data;`
459			`int err = 0;`
460
461			`BT_DBG("");`
462
463			`/* Verify the status of the device */`
464			`if (!hu)`
465			`return -EBADF;`
466
467			`switch (cmd) {`
468			`case HCIUARTSETPROTO:`
469			`if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {`
470			`err = hci_uart_set_proto(hu, arg);`
471			`if (err) {`
472			`clear_bit(HCI_UART_PROTO_SET, &hu->flags);`
473			`return err;`
474			`}`
475			`tty->low_latency = 1;`
476			`} else`
477			`return -EBUSY;`
478			`break;`
479
480			`case HCIUARTGETPROTO:`
481			`if (test_bit(HCI_UART_PROTO_SET, &hu->flags))`
482			`return hu->proto->id;`
483			`return -EUNATCH;`
484
485			`case HCIUARTGETDEVICE:`
486			`if (test_bit(HCI_UART_PROTO_SET, &hu->flags))`
487			`return hu->hdev->id;`
488			`return -EUNATCH;`
489
490			`default:`
491			`err = n_tty_ioctl(tty, file, cmd, arg);`
492			`break;`
493			`};`
494
495			`return err;`
496			`}`
497
498			`/*`
499			`* We don't provide read/write/poll interface for user space.`
500			`*/`
501			`static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,`
502			`unsigned char __user *buf, size_t nr)`
503			`{`
504			`return 0;`
505			`}`
506
507			`static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,`
508			`const unsigned char *data, size_t count)`
509			`{`
510			`return 0;`
511			`}`
512
513			`static unsigned int hci_uart_tty_poll(struct tty_struct *tty,`
514			`struct file filp, poll_table wait)`
515			`{`
516			`return 0;`
517			`}`
518
519			`static int __init hci_uart_init(void)`
520			`{`
521			`static struct tty_ldisc hci_uart_ldisc;`
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));`
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;`
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;`
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`
552			`#ifdef CONFIG_BT_HCIUART_LL`
553			`ll_init();`
554			`#endif`
555
556			`return 0;`
557			`}`
558
559			`static void __exit hci_uart_exit(void)`
560			`{`
561			`int err;`
562
563			`#ifdef CONFIG_BT_HCIUART_H4`
564			`h4_deinit();`
565			`#endif`
566			`#ifdef CONFIG_BT_HCIUART_BCSP`
567			`bcsp_deinit();`
568			`#endif`
569			`#ifdef CONFIG_BT_HCIUART_LL`
570			`ll_deinit();`
571			`#endif`
572
573			`/* Release tty registration of line discipline */`
574			`if ((err = tty_unregister_ldisc(N_HCI)))`
575			`BT_ERR("Can't unregister HCI line discipline (%d)", err);`
576			`}`
577
578			`module_init(hci_uart_init);`
579			`module_exit(hci_uart_exit);`
580
581			`module_param(reset, bool, 0644);`
582			`MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");`
583
584			`MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");`
585			`MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);`
586			`MODULE_VERSION(VERSION);`
587			`MODULE_LICENSE("GPL");`
588			`MODULE_ALIAS_LDISC(N_HCI);`