// SPDX-License-Identifier: GPL-2.0-only
/*
 * Input device TTY line discipline
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 *
 * This is a module that converts a tty line into a much simpler
 * 'serial io port' abstraction that the input device drivers use.
 */


#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/tty.h>
#include <linux/compat.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Input device TTY line discipline");
MODULE_LICENSE("GPL");
MODULE_ALIAS_LDISC(N_MOUSE);

#define SERPORT_BUSY    1
#define SERPORT_ACTIVE  2
#define SERPORT_DEAD    3

struct serport {
        struct tty_struct *tty;
        wait_queue_head_t wait;
        struct serio *serio;
        struct serio_device_id id;
        spinlock_t lock;
        unsigned long flags;
};

/*
 * Callback functions from the serio code.
 */

static int serport_serio_write(struct serio *serio, unsigned char data)
{
        struct serport *serport = serio->port_data;
        return -(serport->tty->ops->write(serport->tty, &data, 1) != 1);
}

static int serport_serio_open(struct serio *serio)
{
        struct serport *serport = serio->port_data;

        guard(spinlock_irqsave)(&serport->lock);
        set_bit(SERPORT_ACTIVE, &serport->flags);

        return 0;
}


static void serport_serio_close(struct serio *serio)
{
        struct serport *serport = serio->port_data;

        guard(spinlock_irqsave)(&serport->lock);
        clear_bit(SERPORT_ACTIVE, &serport->flags);
}

/*
 * serport_ldisc_open() is the routine that is called upon setting our line
 * discipline on a tty. It prepares the serio struct.
 */

static int serport_ldisc_open(struct tty_struct *tty)
{
        struct serport *serport;

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

        serport = kzalloc_obj(*serport);
        if (!serport)
                return -ENOMEM;

        serport->tty = tty;
        spin_lock_init(&serport->lock);
        init_waitqueue_head(&serport->wait);

        tty->disc_data = serport;
        tty->receive_room = 256;
        set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);

        return 0;
}

/*
 * serport_ldisc_close() is the opposite of serport_ldisc_open()
 */

static void serport_ldisc_close(struct tty_struct *tty)
{
        struct serport *serport = tty->disc_data;

        kfree(serport);
}

/*
 * serport_ldisc_receive() is called by the low level tty driver when characters
 * are ready for us. We forward the characters and flags, one by one to the
 * 'interrupt' routine.
 */

static void serport_ldisc_receive(struct tty_struct *tty, const u8 *cp,
                                  const u8 *fp, size_t count)
{
        struct serport *serport = tty->disc_data;
        unsigned int ch_flags = 0;
        int i;

        guard(spinlock_irqsave)(&serport->lock);

        if (!test_bit(SERPORT_ACTIVE, &serport->flags))
                return;

        for (i = 0; i < count; i++) {
                if (fp) {
                        switch (fp[i]) {
                        case TTY_FRAME:
                                ch_flags = SERIO_FRAME;
                                break;

                        case TTY_PARITY:
                                ch_flags = SERIO_PARITY;
                                break;

                        default:
                                ch_flags = 0;
                                break;
                        }
                }

                serio_interrupt(serport->serio, cp[i], ch_flags);
        }
}

/*
 * serport_ldisc_read() just waits indefinitely if everything goes well.
 * However, when the serio driver closes the serio port, it finishes,
 * returning 0 characters.
 */

static ssize_t serport_ldisc_read(struct tty_struct * tty, struct file * file,
                                  u8 *kbuf, size_t nr, void **cookie,
                                  unsigned long offset)
{
        struct serport *serport = tty->disc_data;
        struct serio *serio;

        if (test_and_set_bit(SERPORT_BUSY, &serport->flags))
                return -EBUSY;

        serport->serio = serio = kzalloc_obj(*serio);
        if (!serio)
                return -ENOMEM;

        strscpy(serio->name, "Serial port", sizeof(serio->name));
        snprintf(serio->phys, sizeof(serio->phys), "%s/serio0", tty_name(tty));
        serio->id = serport->id;
        serio->id.type = SERIO_RS232;
        serio->write = serport_serio_write;
        serio->open = serport_serio_open;
        serio->close = serport_serio_close;
        serio->port_data = serport;
        serio->dev.parent = tty->dev;

        serio_register_port(serport->serio);
        printk(KERN_INFO "serio: Serial port %s\n", tty_name(tty));

        wait_event_interruptible(serport->wait, test_bit(SERPORT_DEAD, &serport->flags));
        serio_unregister_port(serport->serio);
        serport->serio = NULL;

        clear_bit(SERPORT_DEAD, &serport->flags);
        clear_bit(SERPORT_BUSY, &serport->flags);

        return 0;
}

static void serport_set_type(struct tty_struct *tty, unsigned long type)
{
        struct serport *serport = tty->disc_data;

        serport->id.proto = type & 0x000000ff;
        serport->id.id    = (type & 0x0000ff00) >> 8;
        serport->id.extra = (type & 0x00ff0000) >> 16;
}

/*
 * serport_ldisc_ioctl() allows to set the port protocol, and device ID
 */

static int serport_ldisc_ioctl(struct tty_struct *tty, unsigned int cmd,
                               unsigned long arg)
{
        if (cmd == SPIOCSTYPE) {
                unsigned long type;

                if (get_user(type, (unsigned long __user *) arg))
                        return -EFAULT;

                serport_set_type(tty, type);
                return 0;
        }

        return -EINVAL;
}

#ifdef CONFIG_COMPAT
#define COMPAT_SPIOCSTYPE       _IOW('q', 0x01, compat_ulong_t)
static int serport_ldisc_compat_ioctl(struct tty_struct *tty,
                                       unsigned int cmd, unsigned long arg)
{
        if (cmd == COMPAT_SPIOCSTYPE) {
                void __user *uarg = compat_ptr(arg);
                compat_ulong_t compat_type;

                if (get_user(compat_type, (compat_ulong_t __user *)uarg))
                        return -EFAULT;

                serport_set_type(tty, compat_type);
                return 0;
        }

        return -EINVAL;
}
#endif

static void serport_ldisc_hangup(struct tty_struct *tty)
{
        struct serport *serport = tty->disc_data;

        scoped_guard(spinlock_irqsave, &serport->lock)
                set_bit(SERPORT_DEAD, &serport->flags);

        wake_up_interruptible(&serport->wait);
}

static void serport_ldisc_write_wakeup(struct tty_struct * tty)
{
        struct serport *serport = tty->disc_data;

        guard(spinlock_irqsave)(&serport->lock);

        if (test_bit(SERPORT_ACTIVE, &serport->flags))
                serio_drv_write_wakeup(serport->serio);
}

/*
 * The line discipline structure.
 */

static struct tty_ldisc_ops serport_ldisc = {
        .owner =        THIS_MODULE,
        .num =          N_MOUSE,
        .name =         "input",
        .open =         serport_ldisc_open,
        .close =        serport_ldisc_close,
        .read =         serport_ldisc_read,
        .ioctl =        serport_ldisc_ioctl,
#ifdef CONFIG_COMPAT
        .compat_ioctl = serport_ldisc_compat_ioctl,
#endif
        .receive_buf =  serport_ldisc_receive,
        .hangup =       serport_ldisc_hangup,
        .write_wakeup = serport_ldisc_write_wakeup
};

/*
 * The functions for insering/removing us as a module.
 */

static int __init serport_init(void)
{
        int retval;
        retval = tty_register_ldisc(&serport_ldisc);
        if (retval)
                printk(KERN_ERR "serport.c: Error registering line discipline.\n");

        return  retval;
}

static void __exit serport_exit(void)
{
        tty_unregister_ldisc(&serport_ldisc);
}

module_init(serport_init);
module_exit(serport_exit);