18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) 48c2ecf20Sopenharmony_ci */ 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci#include <errno.h> 78c2ecf20Sopenharmony_ci#include <fcntl.h> 88c2ecf20Sopenharmony_ci#include <termios.h> 98c2ecf20Sopenharmony_ci#include "chan_user.h" 108c2ecf20Sopenharmony_ci#include <os.h> 118c2ecf20Sopenharmony_ci#include <um_malloc.h> 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_cistruct tty_chan { 148c2ecf20Sopenharmony_ci char *dev; 158c2ecf20Sopenharmony_ci int raw; 168c2ecf20Sopenharmony_ci struct termios tt; 178c2ecf20Sopenharmony_ci}; 188c2ecf20Sopenharmony_ci 198c2ecf20Sopenharmony_cistatic void *tty_chan_init(char *str, int device, const struct chan_opts *opts) 208c2ecf20Sopenharmony_ci{ 218c2ecf20Sopenharmony_ci struct tty_chan *data; 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci if (*str != ':') { 248c2ecf20Sopenharmony_ci printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify " 258c2ecf20Sopenharmony_ci "a device\n"); 268c2ecf20Sopenharmony_ci return NULL; 278c2ecf20Sopenharmony_ci } 288c2ecf20Sopenharmony_ci str++; 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ci data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL); 318c2ecf20Sopenharmony_ci if (data == NULL) 328c2ecf20Sopenharmony_ci return NULL; 338c2ecf20Sopenharmony_ci *data = ((struct tty_chan) { .dev = str, 348c2ecf20Sopenharmony_ci .raw = opts->raw }); 358c2ecf20Sopenharmony_ci 368c2ecf20Sopenharmony_ci return data; 378c2ecf20Sopenharmony_ci} 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_cistatic int tty_open(int input, int output, int primary, void *d, 408c2ecf20Sopenharmony_ci char **dev_out) 418c2ecf20Sopenharmony_ci{ 428c2ecf20Sopenharmony_ci struct tty_chan *data = d; 438c2ecf20Sopenharmony_ci int fd, err, mode = 0; 448c2ecf20Sopenharmony_ci 458c2ecf20Sopenharmony_ci if (input && output) 468c2ecf20Sopenharmony_ci mode = O_RDWR; 478c2ecf20Sopenharmony_ci else if (input) 488c2ecf20Sopenharmony_ci mode = O_RDONLY; 498c2ecf20Sopenharmony_ci else if (output) 508c2ecf20Sopenharmony_ci mode = O_WRONLY; 518c2ecf20Sopenharmony_ci 528c2ecf20Sopenharmony_ci fd = open(data->dev, mode); 538c2ecf20Sopenharmony_ci if (fd < 0) 548c2ecf20Sopenharmony_ci return -errno; 558c2ecf20Sopenharmony_ci 568c2ecf20Sopenharmony_ci if (data->raw) { 578c2ecf20Sopenharmony_ci CATCH_EINTR(err = tcgetattr(fd, &data->tt)); 588c2ecf20Sopenharmony_ci if (err) 598c2ecf20Sopenharmony_ci return err; 608c2ecf20Sopenharmony_ci 618c2ecf20Sopenharmony_ci err = raw(fd); 628c2ecf20Sopenharmony_ci if (err) 638c2ecf20Sopenharmony_ci return err; 648c2ecf20Sopenharmony_ci } 658c2ecf20Sopenharmony_ci 668c2ecf20Sopenharmony_ci *dev_out = data->dev; 678c2ecf20Sopenharmony_ci return fd; 688c2ecf20Sopenharmony_ci} 698c2ecf20Sopenharmony_ci 708c2ecf20Sopenharmony_ciconst struct chan_ops tty_ops = { 718c2ecf20Sopenharmony_ci .type = "tty", 728c2ecf20Sopenharmony_ci .init = tty_chan_init, 738c2ecf20Sopenharmony_ci .open = tty_open, 748c2ecf20Sopenharmony_ci .close = generic_close, 758c2ecf20Sopenharmony_ci .read = generic_read, 768c2ecf20Sopenharmony_ci .write = generic_write, 778c2ecf20Sopenharmony_ci .console_write = generic_console_write, 788c2ecf20Sopenharmony_ci .window_size = generic_window_size, 798c2ecf20Sopenharmony_ci .free = generic_free, 808c2ecf20Sopenharmony_ci .winch = 0, 818c2ecf20Sopenharmony_ci}; 82