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109 lines
2.3 KiB
109 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2019 Axis Communications AB |
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* |
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* Based on ttyprintk.c: |
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* Copyright (C) 2010 Samo Pogacnik |
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*/ |
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#include <linux/console.h> |
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#include <linux/module.h> |
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#include <linux/tty.h> |
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static const struct tty_port_operations ttynull_port_ops; |
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static struct tty_driver *ttynull_driver; |
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static struct tty_port ttynull_port; |
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static int ttynull_open(struct tty_struct *tty, struct file *filp) |
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{ |
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return tty_port_open(&ttynull_port, tty, filp); |
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} |
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static void ttynull_close(struct tty_struct *tty, struct file *filp) |
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{ |
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tty_port_close(&ttynull_port, tty, filp); |
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} |
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static void ttynull_hangup(struct tty_struct *tty) |
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{ |
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tty_port_hangup(&ttynull_port); |
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} |
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static int ttynull_write(struct tty_struct *tty, const unsigned char *buf, |
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int count) |
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{ |
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return count; |
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} |
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static unsigned int ttynull_write_room(struct tty_struct *tty) |
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{ |
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return 65536; |
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} |
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static const struct tty_operations ttynull_ops = { |
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.open = ttynull_open, |
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.close = ttynull_close, |
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.hangup = ttynull_hangup, |
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.write = ttynull_write, |
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.write_room = ttynull_write_room, |
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}; |
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static struct tty_driver *ttynull_device(struct console *c, int *index) |
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{ |
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*index = 0; |
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return ttynull_driver; |
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} |
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static struct console ttynull_console = { |
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.name = "ttynull", |
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.device = ttynull_device, |
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}; |
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static int __init ttynull_init(void) |
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{ |
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struct tty_driver *driver; |
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int ret; |
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driver = tty_alloc_driver(1, |
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TTY_DRIVER_RESET_TERMIOS | |
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TTY_DRIVER_REAL_RAW | |
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TTY_DRIVER_UNNUMBERED_NODE); |
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if (IS_ERR(driver)) |
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return PTR_ERR(driver); |
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tty_port_init(&ttynull_port); |
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ttynull_port.ops = &ttynull_port_ops; |
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driver->driver_name = "ttynull"; |
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driver->name = "ttynull"; |
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driver->type = TTY_DRIVER_TYPE_CONSOLE; |
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driver->init_termios = tty_std_termios; |
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driver->init_termios.c_oflag = OPOST | OCRNL | ONOCR | ONLRET; |
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tty_set_operations(driver, &ttynull_ops); |
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tty_port_link_device(&ttynull_port, driver, 0); |
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ret = tty_register_driver(driver); |
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if (ret < 0) { |
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tty_driver_kref_put(driver); |
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tty_port_destroy(&ttynull_port); |
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return ret; |
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} |
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ttynull_driver = driver; |
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register_console(&ttynull_console); |
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return 0; |
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} |
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static void __exit ttynull_exit(void) |
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{ |
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unregister_console(&ttynull_console); |
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tty_unregister_driver(ttynull_driver); |
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tty_driver_kref_put(ttynull_driver); |
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tty_port_destroy(&ttynull_port); |
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} |
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module_init(ttynull_init); |
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module_exit(ttynull_exit); |
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MODULE_LICENSE("GPL v2");
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