linux/drivers/usb/serial/console.c

// SPDX-License-Identifier: GPL-2.0
/*
 * USB Serial Console driver
 *
 * Copyright (C) 2001 - 2002 Greg Kroah-Hartman ([email protected])
 *
 * Thanks to Randy Dunlap for the original version of this code.
 *
 */

#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>

struct usbcons_info { … };

static struct usbcons_info usbcons_info;
static struct console usbcons;

/*
 * ------------------------------------------------------------
 * USB Serial console driver
 *
 * Much of the code here is copied from drivers/char/serial.c
 * and implements a phony serial console in the same way that
 * serial.c does so that in case some software queries it,
 * it will get the same results.
 *
 * Things that are different from the way the serial port code
 * does things, is that we call the lower level usb-serial
 * driver code to initialize the device, and we set the initial
 * console speeds based on the command line arguments.
 * ------------------------------------------------------------
 */

static const struct tty_operations usb_console_fake_tty_ops = …;

/*
 * The parsing of the command line works exactly like the
 * serial.c code, except that the specifier is "ttyUSB" instead
 * of "ttyS".
 */
static int usb_console_setup(struct console *co, char *options)
{ … }

static void usb_console_write(struct console *co,
					const char *buf, unsigned count)
{ … }

static struct tty_driver *usb_console_device(struct console *co, int *index)
{ … }

static struct console usbcons = …;

void usb_serial_console_disconnect(struct usb_serial *serial)
{ … }

void usb_serial_console_init(int minor)
{ … }

void usb_serial_console_exit(void)
{ … }