linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Tty port functions

 */

​

#include <linux/types.h>

#include <linux/errno.h>

#include <linux/tty.h>

#include <linux/tty_driver.h>

#include <linux/tty_flip.h>

#include <linux/serial.h>

#include <linux/timer.h>

#include <linux/string.h>

#include <linux/slab.h>

#include <linux/sched/signal.h>

#include <linux/wait.h>

#include <linux/bitops.h>

#include <linux/delay.h>

#include <linux/module.h>

#include <linux/serdev.h>

​

static int tty_port_default_receive_buf(struct tty_port *port,

                    const unsigned char *p,

                    const unsigned char *f, size_t count)

{

    int ret;

    struct tty_struct *tty;

    struct tty_ldisc *disc;

​

    tty = READ_ONCE(port->itty);

    if (!tty)

        return 0;

​

    disc = tty_ldisc_ref(tty);

    if (!disc)

        return 0;

​

    ret = tty_ldisc_receive_buf(disc, p, (char *)f, count);

​

    tty_ldisc_deref(disc);

​

    return ret;

}

​

static void tty_port_default_wakeup(struct tty_port *port)

{

    struct tty_struct *tty = tty_port_tty_get(port);

​

    if (tty) {

        tty_wakeup(tty);

        tty_kref_put(tty);

    }

}

​

static const struct tty_port_client_operations default_client_ops = {

    .receive_buf = tty_port_default_receive_buf,

    .write_wakeup = tty_port_default_wakeup,

};

​

void tty_port_init(struct tty_port *port)

{

    memset(port, 0, sizeof(*port));

    tty_buffer_init(port);