162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) 462306a36Sopenharmony_ci */ 562306a36Sopenharmony_ci 662306a36Sopenharmony_ci#include <errno.h> 762306a36Sopenharmony_ci#include <fcntl.h> 862306a36Sopenharmony_ci#include <termios.h> 962306a36Sopenharmony_ci#include "chan_user.h" 1062306a36Sopenharmony_ci#include <os.h> 1162306a36Sopenharmony_ci#include <um_malloc.h> 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_cistruct tty_chan { 1462306a36Sopenharmony_ci char *dev; 1562306a36Sopenharmony_ci int raw; 1662306a36Sopenharmony_ci struct termios tt; 1762306a36Sopenharmony_ci}; 1862306a36Sopenharmony_ci 1962306a36Sopenharmony_cistatic void *tty_chan_init(char *str, int device, const struct chan_opts *opts) 2062306a36Sopenharmony_ci{ 2162306a36Sopenharmony_ci struct tty_chan *data; 2262306a36Sopenharmony_ci 2362306a36Sopenharmony_ci if (*str != ':') { 2462306a36Sopenharmony_ci printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify " 2562306a36Sopenharmony_ci "a device\n"); 2662306a36Sopenharmony_ci return NULL; 2762306a36Sopenharmony_ci } 2862306a36Sopenharmony_ci str++; 2962306a36Sopenharmony_ci 3062306a36Sopenharmony_ci data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL); 3162306a36Sopenharmony_ci if (data == NULL) 3262306a36Sopenharmony_ci return NULL; 3362306a36Sopenharmony_ci *data = ((struct tty_chan) { .dev = str, 3462306a36Sopenharmony_ci .raw = opts->raw }); 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ci return data; 3762306a36Sopenharmony_ci} 3862306a36Sopenharmony_ci 3962306a36Sopenharmony_cistatic int tty_open(int input, int output, int primary, void *d, 4062306a36Sopenharmony_ci char **dev_out) 4162306a36Sopenharmony_ci{ 4262306a36Sopenharmony_ci struct tty_chan *data = d; 4362306a36Sopenharmony_ci int fd, err, mode = 0; 4462306a36Sopenharmony_ci 4562306a36Sopenharmony_ci if (input && output) 4662306a36Sopenharmony_ci mode = O_RDWR; 4762306a36Sopenharmony_ci else if (input) 4862306a36Sopenharmony_ci mode = O_RDONLY; 4962306a36Sopenharmony_ci else if (output) 5062306a36Sopenharmony_ci mode = O_WRONLY; 5162306a36Sopenharmony_ci 5262306a36Sopenharmony_ci fd = open(data->dev, mode); 5362306a36Sopenharmony_ci if (fd < 0) 5462306a36Sopenharmony_ci return -errno; 5562306a36Sopenharmony_ci 5662306a36Sopenharmony_ci if (data->raw) { 5762306a36Sopenharmony_ci CATCH_EINTR(err = tcgetattr(fd, &data->tt)); 5862306a36Sopenharmony_ci if (err) 5962306a36Sopenharmony_ci return err; 6062306a36Sopenharmony_ci 6162306a36Sopenharmony_ci err = raw(fd); 6262306a36Sopenharmony_ci if (err) 6362306a36Sopenharmony_ci return err; 6462306a36Sopenharmony_ci } 6562306a36Sopenharmony_ci 6662306a36Sopenharmony_ci *dev_out = data->dev; 6762306a36Sopenharmony_ci return fd; 6862306a36Sopenharmony_ci} 6962306a36Sopenharmony_ci 7062306a36Sopenharmony_ciconst struct chan_ops tty_ops = { 7162306a36Sopenharmony_ci .type = "tty", 7262306a36Sopenharmony_ci .init = tty_chan_init, 7362306a36Sopenharmony_ci .open = tty_open, 7462306a36Sopenharmony_ci .close = generic_close, 7562306a36Sopenharmony_ci .read = generic_read, 7662306a36Sopenharmony_ci .write = generic_write, 7762306a36Sopenharmony_ci .console_write = generic_console_write, 7862306a36Sopenharmony_ci .window_size = generic_window_size, 7962306a36Sopenharmony_ci .free = generic_free, 8062306a36Sopenharmony_ci .winch = 0, 8162306a36Sopenharmony_ci}; 82