1/* 2 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) 3 * Licensed under the GPL 4 */ 5 6#include "linux/fs.h" 7#include "linux/tty.h" 8#include "linux/tty_driver.h" 9#include "linux/major.h" 10#include "linux/mm.h" 11#include "linux/init.h" 12#include "linux/console.h" 13#include "asm/termbits.h" 14#include "asm/irq.h" 15#include "line.h" 16#include "ssl.h" 17#include "chan_kern.h" 18#include "kern.h" 19#include "init.h" 20#include "irq_user.h" 21#include "mconsole_kern.h" 22 23static const int ssl_version = 1; 24 25/* Referenced only by tty_driver below - presumably it's locked correctly 26 * by the tty driver. 27 */ 28 29static struct tty_driver *ssl_driver; 30 31#define NR_PORTS 64 32 33static void ssl_announce(char *dev_name, int dev) 34{ 35 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev, 36 dev_name); 37} 38 39/* Almost const, except that xterm_title may be changed in an initcall */ 40static struct chan_opts opts = { 41 .announce = ssl_announce, 42 .xterm_title = "Serial Line #%d", 43 .raw = 1, 44}; 45 46static int ssl_config(char *str, char **error_out); 47static int ssl_get_config(char *dev, char *str, int size, char **error_out); 48static int ssl_remove(int n, char **error_out); 49 50 51/* Const, except for .mc.list */ 52static struct line_driver driver = { 53 .name = "UML serial line", 54 .device_name = "ttyS", 55 .major = TTY_MAJOR, 56 .minor_start = 64, 57 .type = TTY_DRIVER_TYPE_SERIAL, 58 .subtype = 0, 59 .read_irq = SSL_IRQ, 60 .read_irq_name = "ssl", 61 .write_irq = SSL_WRITE_IRQ, 62 .write_irq_name = "ssl-write", 63 .mc = { 64 .list = LIST_HEAD_INIT(driver.mc.list), 65 .name = "ssl", 66 .config = ssl_config, 67 .get_config = ssl_get_config, 68 .id = line_id, 69 .remove = ssl_remove, 70 }, 71}; 72 73/* The array is initialized by line_init, at initcall time. The 74 * elements are locked individually as needed. 75 */ 76static struct line serial_lines[NR_PORTS] = 77 { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) }; 78 79static int ssl_config(char *str, char **error_out) 80{ 81 return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts, 82 error_out); 83} 84 85static int ssl_get_config(char *dev, char *str, int size, char **error_out) 86{ 87 return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str, 88 size, error_out); 89} 90 91static int ssl_remove(int n, char **error_out) 92{ 93 return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n, 94 error_out); 95} 96 97static int ssl_open(struct tty_struct *tty, struct file *filp) 98{ 99 int err = line_open(serial_lines, tty); 100 101 if (err) 102 printk(KERN_ERR "Failed to open serial line %d, err = %d\n", 103 tty->index, err); 104 105 return err; 106} 107 108 109static const struct tty_operations ssl_ops = { 110 .open = ssl_open, 111 .close = line_close, 112 .write = line_write, 113 .put_char = line_put_char, 114 .write_room = line_write_room, 115 .chars_in_buffer = line_chars_in_buffer, 116 .flush_buffer = line_flush_buffer, 117 .flush_chars = line_flush_chars, 118 .set_termios = line_set_termios, 119 .ioctl = line_ioctl, 120 .throttle = line_throttle, 121 .unthrottle = line_unthrottle, 122}; 123 124/* Changed by ssl_init and referenced by ssl_exit, which are both serialized 125 * by being an initcall and exitcall, respectively. 126 */ 127static int ssl_init_done = 0; 128 129static void ssl_console_write(struct console *c, const char *string, 130 unsigned len) 131{ 132 struct line *line = &serial_lines[c->index]; 133 unsigned long flags; 134 135 spin_lock_irqsave(&line->lock, flags); 136 console_write_chan(&line->chan_list, string, len); 137 spin_unlock_irqrestore(&line->lock, flags); 138} 139 140static struct tty_driver *ssl_console_device(struct console *c, int *index) 141{ 142 *index = c->index; 143 return ssl_driver; 144} 145 146static int ssl_console_setup(struct console *co, char *options) 147{ 148 struct line *line = &serial_lines[co->index]; 149 150 return console_open_chan(line, co); 151} 152 153/* No locking for register_console call - relies on single-threaded initcalls */ 154static struct console ssl_cons = { 155 .name = "ttyS", 156 .write = ssl_console_write, 157 .device = ssl_console_device, 158 .setup = ssl_console_setup, 159 .flags = CON_PRINTBUFFER|CON_ANYTIME, 160 .index = -1, 161}; 162 163static int ssl_init(void) 164{ 165 char *new_title; 166 167 printk(KERN_INFO "Initializing software serial port version %d\n", 168 ssl_version); 169 ssl_driver = register_lines(&driver, &ssl_ops, serial_lines, 170 ARRAY_SIZE(serial_lines)); 171 172 new_title = add_xterm_umid(opts.xterm_title); 173 if (new_title != NULL) 174 opts.xterm_title = new_title; 175 176 lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts); 177 178 ssl_init_done = 1; 179 register_console(&ssl_cons); 180 return 0; 181} 182late_initcall(ssl_init); 183 184static void ssl_exit(void) 185{ 186 if (!ssl_init_done) 187 return; 188 close_lines(serial_lines, ARRAY_SIZE(serial_lines)); 189} 190__uml_exitcall(ssl_exit); 191 192static int ssl_chan_setup(char *str) 193{ 194 char *error; 195 int ret; 196 197 ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error); 198 if(ret < 0) 199 printk(KERN_ERR "Failed to set up serial line with " 200 "configuration string \"%s\" : %s\n", str, error); 201 202 return 1; 203} 204 205__setup("ssl", ssl_chan_setup); 206__channel_help(ssl_chan_setup, "ssl"); 207