// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 *  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>
 */

#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 <linux/firmware.h>
#include <linux/serdev.h>

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

#include "btintel.h"
#include "btbcm.h"
#include "hci_uart.h"

#define VERSION "2.3"

static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];

int hci_uart_register_proto(const struct hci_uart_proto *p)
{
        if (p->id >= HCI_UART_MAX_PROTO)
                return -EINVAL;

        if (hup[p->id])
                return -EEXIST;

        hup[p->id] = p;

        BT_INFO("HCI UART protocol %s registered", p->name);

        return 0;
}

int hci_uart_unregister_proto(const 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 const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
{
        if (id >= HCI_UART_MAX_PROTO)
                return NULL;

        return hup[id];
}

static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
{
        struct hci_dev *hdev = hu->hdev;

        /* Update HCI stat counters */
        switch (pkt_type) {
        case HCI_COMMAND_PKT:
                hdev->stat.cmd_tx++;
                break;

        case HCI_ACLDATA_PKT:
                hdev->stat.acl_tx++;
                break;

        case HCI_SCODATA_PKT:
                hdev->stat.sco_tx++;
                break;
        }
}

static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
{
        struct sk_buff *skb = hu->tx_skb;

        if (!skb) {
                percpu_down_read(&hu->proto_lock);

                if (test_bit(HCI_UART_PROTO_READY, &hu->flags) ||
                    test_bit(HCI_UART_PROTO_INIT, &hu->flags))
                        skb = hu->proto->dequeue(hu);

                percpu_up_read(&hu->proto_lock);
        } else {
                hu->tx_skb = NULL;
        }

        return skb;
}

int hci_uart_tx_wakeup(struct hci_uart *hu)
{
        /* This may be called in an IRQ context, so we can't sleep. Therefore
         * we try to acquire the lock only, and if that fails we assume the
         * tty is being closed because that is the only time the write lock is
         * acquired. If, however, at some point in the future the write lock
         * is also acquired in other situations, then this must be revisited.
         */
        if (!percpu_down_read_trylock(&hu->proto_lock))
                return 0;

        if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) &&
            !test_bit(HCI_UART_PROTO_INIT, &hu->flags))
                goto no_schedule;

        set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
        if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state))
                goto no_schedule;

        BT_DBG("");

        schedule_work(&hu->write_work);

no_schedule:
        percpu_up_read(&hu->proto_lock);

        return 0;
}
EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);

static void hci_uart_write_work(struct work_struct *work)
{
        struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
        struct tty_struct *tty = hu->tty;
        struct hci_dev *hdev = hu->hdev;
        struct sk_buff *skb;

        /* REVISIT: should we cope with bad skbs or ->write() returning
         * and error value ?
         */

restart:
        clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);

        while ((skb = hci_uart_dequeue(hu))) {
                int len;

                set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
                len = tty->ops->write(tty, skb->data, skb->len);
                hdev->stat.byte_tx += len;

                skb_pull(skb, len);
                if (skb->len) {
                        hu->tx_skb = skb;
                        break;
                }

                hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
                kfree_skb(skb);
        }

        clear_bit(HCI_UART_SENDING, &hu->tx_state);
        if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
                goto restart;

        wake_up_bit(&hu->tx_state, HCI_UART_SENDING);
}

void hci_uart_init_work(struct work_struct *work)
{
        struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
        int err;
        struct hci_dev *hdev;

        if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
                return;

        err = hci_register_dev(hu->hdev);
        if (err < 0) {
                BT_ERR("Can't register HCI device");
                clear_bit(HCI_UART_PROTO_READY, &hu->flags);
                hu->proto->close(hu);
                hdev = hu->hdev;
                hu->hdev = NULL;
                hci_free_dev(hdev);
                return;
        }

        set_bit(HCI_UART_REGISTERED, &hu->flags);
}

int hci_uart_init_ready(struct hci_uart *hu)
{
        if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
                return -EALREADY;

        schedule_work(&hu->init_ready);

        return 0;
}

int hci_uart_wait_until_sent(struct hci_uart *hu)
{
        return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING,
                                   TASK_INTERRUPTIBLE,
                                   msecs_to_jiffies(2000));
}

/* ------- Interface to HCI layer ------ */
/* Reset device */
static int hci_uart_flush(struct hci_dev *hdev)
{
        struct hci_uart *hu  = hci_get_drvdata(hdev);
        struct tty_struct *tty = hu->tty;

        BT_DBG("hdev %p tty %p", hdev, tty);

        if (hu->tx_skb) {
                kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
        }

        /* Flush any pending characters in the driver and discipline. */
        tty_ldisc_flush(tty);
        tty_driver_flush_buffer(tty);

        percpu_down_read(&hu->proto_lock);

        if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
                hu->proto->flush(hu);

        percpu_up_read(&hu->proto_lock);

        return 0;
}

/* Initialize device */
static int hci_uart_open(struct hci_dev *hdev)
{
        BT_DBG("%s %p", hdev->name, hdev);

        /* Undo clearing this from hci_uart_close() */
        hdev->flush = hci_uart_flush;

        return 0;
}

/* Close device */
static int hci_uart_close(struct hci_dev *hdev)
{
        BT_DBG("hdev %p", hdev);

        hci_uart_flush(hdev);
        hdev->flush = NULL;
        return 0;
}

/* Send frames from HCI layer */
static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);

        BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
               skb->len);

        percpu_down_read(&hu->proto_lock);

        if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) &&
            !test_bit(HCI_UART_PROTO_INIT, &hu->flags)) {
                percpu_up_read(&hu->proto_lock);
                return -EUNATCH;
        }

        hu->proto->enqueue(hu, skb);
        percpu_up_read(&hu->proto_lock);

        hci_uart_tx_wakeup(hu);

        return 0;
}

/* Check the underlying device or tty has flow control support */
bool hci_uart_has_flow_control(struct hci_uart *hu)
{
        /* serdev nodes check if the needed operations are present */
        if (hu->serdev)
                return true;

        if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
                return true;

        return false;
}

/* Flow control or un-flow control the device */
void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
{
        struct tty_struct *tty = hu->tty;
        struct ktermios ktermios;
        int status;
        unsigned int set = 0;
        unsigned int clear = 0;

        if (hu->serdev) {
                serdev_device_set_flow_control(hu->serdev, !enable);
                serdev_device_set_rts(hu->serdev, !enable);
                return;
        }

        if (enable) {
                /* Disable hardware flow control */
                ktermios = tty->termios;
                ktermios.c_cflag &= ~CRTSCTS;
                tty_set_termios(tty, &ktermios);
                BT_DBG("Disabling hardware flow control: %s",
                       (tty->termios.c_cflag & CRTSCTS) ? "failed" : "success");

                /* Clear RTS to prevent the device from sending */
                /* Most UARTs need OUT2 to enable interrupts */
                status = tty->driver->ops->tiocmget(tty);
                BT_DBG("Current tiocm 0x%x", status);

                set &= ~(TIOCM_OUT2 | TIOCM_RTS);
                clear = ~set;
                set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
                       TIOCM_OUT2 | TIOCM_LOOP;
                clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
                         TIOCM_OUT2 | TIOCM_LOOP;
                status = tty->driver->ops->tiocmset(tty, set, clear);
                BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
        } else {
                /* Set RTS to allow the device to send again */
                status = tty->driver->ops->tiocmget(tty);
                BT_DBG("Current tiocm 0x%x", status);

                set |= (TIOCM_OUT2 | TIOCM_RTS);
                clear = ~set;
                set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
                       TIOCM_OUT2 | TIOCM_LOOP;
                clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
                         TIOCM_OUT2 | TIOCM_LOOP;
                status = tty->driver->ops->tiocmset(tty, set, clear);
                BT_DBG("Setting RTS: %s", status ? "failed" : "success");

                /* Re-enable hardware flow control */
                ktermios = tty->termios;
                ktermios.c_cflag |= CRTSCTS;
                tty_set_termios(tty, &ktermios);
                BT_DBG("Enabling hardware flow control: %s",
                       !(tty->termios.c_cflag & CRTSCTS) ? "failed" : "success");
        }
}

void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
                         unsigned int oper_speed)
{
        hu->init_speed = init_speed;
        hu->oper_speed = oper_speed;
}

void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
        struct tty_struct *tty = hu->tty;
        struct ktermios ktermios;

        ktermios = tty->termios;
        ktermios.c_cflag &= ~CBAUD;
        tty_termios_encode_baud_rate(&ktermios, speed, speed);

        /* tty_set_termios() return not checked as it is always 0 */
        tty_set_termios(tty, &ktermios);

        BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
               tty->termios.c_ispeed, tty->termios.c_ospeed);
}

static int hci_uart_setup(struct hci_dev *hdev)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        struct hci_rp_read_local_version *ver;
        struct sk_buff *skb;
        unsigned int speed;
        int err;

        /* Init speed if any */
        if (hu->init_speed)
                speed = hu->init_speed;
        else if (hu->proto->init_speed)
                speed = hu->proto->init_speed;
        else
                speed = 0;

        if (speed)
                hci_uart_set_baudrate(hu, speed);

        /* Operational speed if any */
        if (hu->oper_speed)
                speed = hu->oper_speed;
        else if (hu->proto->oper_speed)
                speed = hu->proto->oper_speed;
        else
                speed = 0;

        if (hu->proto->set_baudrate && speed) {
                err = hu->proto->set_baudrate(hu, speed);
                if (!err)
                        hci_uart_set_baudrate(hu, speed);
        }

        if (hu->proto->setup)
                return hu->proto->setup(hu);

        if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
                return 0;

        skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
                             HCI_INIT_TIMEOUT);
        if (IS_ERR(skb)) {
                BT_ERR("%s: Reading local version information failed (%ld)",
                       hdev->name, PTR_ERR(skb));
                return 0;
        }

        if (skb->len != sizeof(*ver)) {
                BT_ERR("%s: Event length mismatch for version information",
                       hdev->name);
                goto done;
        }

        ver = (struct hci_rp_read_local_version *)skb->data;

        switch (le16_to_cpu(ver->manufacturer)) {
#ifdef CONFIG_BT_HCIUART_INTEL
        case 2:
                hdev->set_bdaddr = btintel_set_bdaddr;
                btintel_check_bdaddr(hdev);
                break;
#endif
#ifdef CONFIG_BT_HCIUART_BCM
        case 15:
                hdev->set_bdaddr = btbcm_set_bdaddr;
                btbcm_check_bdaddr(hdev);
                break;
#endif
        default:
                break;
        }

done:
        kfree_skb(skb);
        return 0;
}

/* ------ LDISC part ------ */
/* hci_uart_tty_open
 *
 *     Called when line discipline changed to HCI_UART.
 *
 * Arguments:
 *     tty    pointer to tty info structure
 * Return Value:
 *     0 if success, otherwise error code
 */
static int hci_uart_tty_open(struct tty_struct *tty)
{
        struct hci_uart *hu;

        BT_DBG("tty %p", tty);

        if (!capable(CAP_NET_ADMIN))
                return -EPERM;

        /* Error if the tty has no write op instead of leaving an exploitable
         * hole
         */
        if (tty->ops->write == NULL)
                return -EOPNOTSUPP;

        hu = kzalloc_obj(*hu);
        if (!hu) {
                BT_ERR("Can't allocate control structure");
                return -ENFILE;
        }
        if (percpu_init_rwsem(&hu->proto_lock)) {
                BT_ERR("Can't allocate semaphore structure");
                kfree(hu);
                return -ENOMEM;
        }

        tty->disc_data = hu;
        hu->tty = tty;
        tty->receive_room = 65536;

        /* disable alignment support by default */
        hu->alignment = 1;
        hu->padding = 0;

        /* Use serial port speed as oper_speed */
        hu->oper_speed = tty->termios.c_ospeed;

        INIT_WORK(&hu->init_ready, hci_uart_init_work);
        INIT_WORK(&hu->write_work, hci_uart_write_work);

        /* Flush any pending characters in the driver */
        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 = tty->disc_data;
        struct hci_dev *hdev;

        BT_DBG("tty %p", tty);

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

        if (!hu)
                return;

        hdev = hu->hdev;
        if (hdev)
                hci_uart_close(hdev);

        if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
                percpu_down_write(&hu->proto_lock);
                clear_bit(HCI_UART_PROTO_READY, &hu->flags);
                percpu_up_write(&hu->proto_lock);

                cancel_work_sync(&hu->init_ready);
                cancel_work_sync(&hu->write_work);

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

        percpu_free_rwsem(&hu->proto_lock);

        kfree(hu);
}

/* hci_uart_tty_wakeup()
 *
 *    Callback for transmit wakeup. Called when low level
 *    device driver can accept more send data.
 *
 * Arguments:        tty    pointer to associated tty instance data
 * Return Value:    None
 */
static void hci_uart_tty_wakeup(struct tty_struct *tty)
{
        struct hci_uart *hu = 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_READY, &hu->flags) ||
            test_bit(HCI_UART_PROTO_INIT, &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 instance 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,
                                 const u8 *flags, size_t count)
{
        struct hci_uart *hu = tty->disc_data;

        if (!hu || tty != hu->tty)
                return;

        percpu_down_read(&hu->proto_lock);

        if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) &&
            !test_bit(HCI_UART_PROTO_INIT, &hu->flags)) {
                percpu_up_read(&hu->proto_lock);
                return;
        }

        /* It does not need a lock here as it is already protected by a mutex in
         * tty caller
         */
        hu->proto->recv(hu, data, count);
        percpu_up_read(&hu->proto_lock);

        if (hu->hdev)
                hu->hdev->stat.byte_rx += count;

        tty_unthrottle(tty);
}

static int hci_uart_register_dev(struct hci_uart *hu)
{
        struct hci_dev *hdev;
        int err;

        BT_DBG("");

        /* Initialize and register HCI device */
        hdev = hci_alloc_dev();
        if (!hdev) {
                BT_ERR("Can't allocate HCI device");
                return -ENOMEM;
        }

        hu->hdev = hdev;

        hdev->bus = HCI_UART;
        hci_set_drvdata(hdev, hu);

        /* Only when vendor specific setup callback is provided, consider
         * the manufacturer information valid. This avoids filling in the
         * value for Ericsson when nothing is specified.
         */
        if (hu->proto->setup)
                hdev->manufacturer = hu->proto->manufacturer;

        hdev->open  = hci_uart_open;
        hdev->close = hci_uart_close;
        hdev->flush = hci_uart_flush;
        hdev->send  = hci_uart_send_frame;
        hdev->setup = hci_uart_setup;
        SET_HCIDEV_DEV(hdev, hu->tty->dev);

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

        if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
                hci_set_quirk(hdev, HCI_QUIRK_EXTERNAL_CONFIG);

        if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
                hci_set_quirk(hdev, HCI_QUIRK_RESET_ON_CLOSE);

        /* Only call open() for the protocol after hdev is fully initialized as
         * open() (or a timer/workqueue it starts) may attempt to reference it.
         */
        err = hu->proto->open(hu);
        if (err) {
                hu->hdev = NULL;
                hci_free_dev(hdev);
                return err;
        }

        set_bit(HCI_UART_PROTO_INIT, &hu->flags);

        if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
                return 0;

        if (hci_register_dev(hdev) < 0) {
                BT_ERR("Can't register HCI device");
                hu->proto->close(hu);
                hu->hdev = NULL;
                hci_free_dev(hdev);
                return -ENODEV;
        }

        set_bit(HCI_UART_REGISTERED, &hu->flags);

        return 0;
}

static int hci_uart_set_proto(struct hci_uart *hu, int id)
{
        const struct hci_uart_proto *p;
        int err;

        p = hci_uart_get_proto(id);
        if (!p)
                return -EPROTONOSUPPORT;

        hu->proto = p;

        err = hci_uart_register_dev(hu);
        if (err) {
                return err;
        }

        set_bit(HCI_UART_PROTO_READY, &hu->flags);
        clear_bit(HCI_UART_PROTO_INIT, &hu->flags);

        return 0;
}

static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
{
        unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
                                    BIT(HCI_UART_RESET_ON_INIT) |
                                    BIT(HCI_UART_INIT_PENDING) |
                                    BIT(HCI_UART_EXT_CONFIG) |
                                    BIT(HCI_UART_VND_DETECT);

        if (flags & ~valid_flags)
                return -EINVAL;

        hu->hdev_flags = flags;

        return 0;
}

/* hci_uart_tty_ioctl()
 *
 *    Process IOCTL system call for the tty device.
 *
 * Arguments:
 *
 *    tty        pointer to tty instance data
 *    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, unsigned int cmd,
                              unsigned long arg)
{
        struct hci_uart *hu = 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);
                } else
                        err = -EBUSY;
                break;

        case HCIUARTGETPROTO:
                if (test_bit(HCI_UART_PROTO_SET, &hu->flags) &&
                    test_bit(HCI_UART_PROTO_READY, &hu->flags))
                        err = hu->proto->id;
                else
                        err = -EUNATCH;
                break;

        case HCIUARTGETDEVICE:
                if (test_bit(HCI_UART_REGISTERED, &hu->flags))
                        err = hu->hdev->id;
                else
                        err = -EUNATCH;
                break;

        case HCIUARTSETFLAGS:
                if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
                        err = -EBUSY;
                else
                        err = hci_uart_set_flags(hu, arg);
                break;

        case HCIUARTGETFLAGS:
                err = hu->hdev_flags;
                break;

        default:
                err = n_tty_ioctl_helper(tty, 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,
                                 u8 *buf, size_t nr, void **cookie,
                                 unsigned long offset)
{
        return 0;
}

static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
                                  const u8 *data, size_t count)
{
        return 0;
}

static struct tty_ldisc_ops hci_uart_ldisc = {
        .owner          = THIS_MODULE,
        .num            = N_HCI,
        .name           = "n_hci",
        .open           = hci_uart_tty_open,
        .close          = hci_uart_tty_close,
        .read           = hci_uart_tty_read,
        .write          = hci_uart_tty_write,
        .ioctl          = hci_uart_tty_ioctl,
        .compat_ioctl   = hci_uart_tty_ioctl,
        .receive_buf    = hci_uart_tty_receive,
        .write_wakeup   = hci_uart_tty_wakeup,
};

static int __init hci_uart_init(void)
{
        int err;

        BT_INFO("HCI UART driver ver %s", VERSION);

        /* Register the tty discipline */
        err = tty_register_ldisc(&hci_uart_ldisc);
        if (err) {
                BT_ERR("HCI line discipline registration failed. (%d)", err);
                return err;
        }

#ifdef CONFIG_BT_HCIUART_H4
        h4_init();
#endif
#ifdef CONFIG_BT_HCIUART_BCSP
        bcsp_init();
#endif
#ifdef CONFIG_BT_HCIUART_LL
        ll_init();
#endif
#ifdef CONFIG_BT_HCIUART_ATH3K
        ath_init();
#endif
#ifdef CONFIG_BT_HCIUART_3WIRE
        h5_init();
#endif
#ifdef CONFIG_BT_HCIUART_INTEL
        intel_init();
#endif
#ifdef CONFIG_BT_HCIUART_BCM
        bcm_init();
#endif
#ifdef CONFIG_BT_HCIUART_QCA
        qca_init();
#endif
#ifdef CONFIG_BT_HCIUART_AG6XX
        ag6xx_init();
#endif
#ifdef CONFIG_BT_HCIUART_MRVL
        mrvl_init();
#endif
#ifdef CONFIG_BT_HCIUART_AML
        aml_init();
#endif
        return 0;
}

static void __exit hci_uart_exit(void)
{
#ifdef CONFIG_BT_HCIUART_H4
        h4_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_BCSP
        bcsp_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_LL
        ll_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_ATH3K
        ath_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_3WIRE
        h5_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_INTEL
        intel_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_BCM
        bcm_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_QCA
        qca_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_AG6XX
        ag6xx_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_MRVL
        mrvl_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_AML
        aml_deinit();
#endif
        tty_unregister_ldisc(&hci_uart_ldisc);
}

module_init(hci_uart_init);
module_exit(hci_uart_exit);

MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS_LDISC(N_HCI);