Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/config.h"
7#include "linux/fs.h"
8#include "linux/tty.h"
9#include "linux/tty_driver.h"
10#include "linux/major.h"
11#include "linux/mm.h"
12#include "linux/init.h"
13#include "linux/console.h"
14#include "asm/termbits.h"
15#include "asm/irq.h"
16#include "line.h"
17#include "ssl.h"
18#include "chan_kern.h"
19#include "user_util.h"
20#include "kern_util.h"
21#include "kern.h"
22#include "init.h"
23#include "irq_user.h"
24#include "mconsole_kern.h"
25
26static int ssl_version = 1;
27
28/* Referenced only by tty_driver below - presumably it's locked correctly
29 * by the tty driver.
30 */
31
32static struct tty_driver *ssl_driver;
33
34#define NR_PORTS 64
35
36void ssl_announce(char *dev_name, int dev)
37{
38 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
39 dev_name);
40}
41
42static struct chan_opts opts = {
43 .announce = ssl_announce,
44 .xterm_title = "Serial Line #%d",
45 .raw = 1,
46 .tramp_stack = 0,
47 .in_kernel = 1,
48};
49
50static int ssl_config(char *str);
51static int ssl_get_config(char *dev, char *str, int size, char **error_out);
52static int ssl_remove(int n);
53
54static struct line_driver driver = {
55 .name = "UML serial line",
56 .device_name = "ttyS",
57 .devfs_name = "tts/",
58 .major = TTY_MAJOR,
59 .minor_start = 64,
60 .type = TTY_DRIVER_TYPE_SERIAL,
61 .subtype = 0,
62 .read_irq = SSL_IRQ,
63 .read_irq_name = "ssl",
64 .write_irq = SSL_WRITE_IRQ,
65 .write_irq_name = "ssl-write",
66 .symlink_from = "serial",
67 .symlink_to = "tts",
68 .mc = {
69 .name = "ssl",
70 .config = ssl_config,
71 .get_config = ssl_get_config,
72 .id = line_id,
73 .remove = ssl_remove,
74 },
75};
76
77/* The array is initialized by line_init, which is an initcall. The
78 * individual elements are protected by individual semaphores.
79 */
80static struct line serial_lines[NR_PORTS] =
81 { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
82
83static struct lines lines = LINES_INIT(NR_PORTS);
84
85static int ssl_config(char *str)
86{
87 return(line_config(serial_lines,
88 sizeof(serial_lines)/sizeof(serial_lines[0]), str));
89}
90
91static int ssl_get_config(char *dev, char *str, int size, char **error_out)
92{
93 return(line_get_config(dev, serial_lines,
94 sizeof(serial_lines)/sizeof(serial_lines[0]),
95 str, size, error_out));
96}
97
98static int ssl_remove(int n)
99{
100 return line_remove(serial_lines,
101 sizeof(serial_lines)/sizeof(serial_lines[0]), n);
102}
103
104int ssl_open(struct tty_struct *tty, struct file *filp)
105{
106 return line_open(serial_lines, tty, &opts);
107}
108
109#if 0
110static void ssl_flush_buffer(struct tty_struct *tty)
111{
112 return;
113}
114
115static void ssl_throttle(struct tty_struct * tty)
116{
117 printk(KERN_ERR "Someone should implement ssl_throttle\n");
118}
119
120static void ssl_unthrottle(struct tty_struct * tty)
121{
122 printk(KERN_ERR "Someone should implement ssl_unthrottle\n");
123}
124
125static void ssl_stop(struct tty_struct *tty)
126{
127 printk(KERN_ERR "Someone should implement ssl_stop\n");
128}
129
130static void ssl_start(struct tty_struct *tty)
131{
132 printk(KERN_ERR "Someone should implement ssl_start\n");
133}
134
135void ssl_hangup(struct tty_struct *tty)
136{
137}
138#endif
139
140static struct tty_operations ssl_ops = {
141 .open = ssl_open,
142 .close = line_close,
143 .write = line_write,
144 .put_char = line_put_char,
145 .write_room = line_write_room,
146 .chars_in_buffer = line_chars_in_buffer,
147 .flush_buffer = line_flush_buffer,
148 .flush_chars = line_flush_chars,
149 .set_termios = line_set_termios,
150 .ioctl = line_ioctl,
151#if 0
152 .throttle = ssl_throttle,
153 .unthrottle = ssl_unthrottle,
154 .stop = ssl_stop,
155 .start = ssl_start,
156 .hangup = ssl_hangup,
157#endif
158};
159
160/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
161 * by being an initcall and exitcall, respectively.
162 */
163static int ssl_init_done = 0;
164
165static void ssl_console_write(struct console *c, const char *string,
166 unsigned len)
167{
168 struct line *line = &serial_lines[c->index];
169 unsigned long flags;
170
171 spin_lock_irqsave(&line->lock, flags);
172 console_write_chan(&line->chan_list, string, len);
173 spin_unlock_irqrestore(&line->lock, flags);
174}
175
176static struct tty_driver *ssl_console_device(struct console *c, int *index)
177{
178 *index = c->index;
179 return ssl_driver;
180}
181
182static int ssl_console_setup(struct console *co, char *options)
183{
184 struct line *line = &serial_lines[co->index];
185
186 return console_open_chan(line,co,&opts);
187}
188
189static struct console ssl_cons = {
190 .name = "ttyS",
191 .write = ssl_console_write,
192 .device = ssl_console_device,
193 .setup = ssl_console_setup,
194 .flags = CON_PRINTBUFFER,
195 .index = -1,
196};
197
198int ssl_init(void)
199{
200 char *new_title;
201
202 printk(KERN_INFO "Initializing software serial port version %d\n",
203 ssl_version);
204 ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops,
205 serial_lines, ARRAY_SIZE(serial_lines));
206
207 lines_init(serial_lines, sizeof(serial_lines)/sizeof(serial_lines[0]));
208
209 new_title = add_xterm_umid(opts.xterm_title);
210 if (new_title != NULL)
211 opts.xterm_title = new_title;
212
213 ssl_init_done = 1;
214 register_console(&ssl_cons);
215 return(0);
216}
217late_initcall(ssl_init);
218
219static void ssl_exit(void)
220{
221 if (!ssl_init_done)
222 return;
223 close_lines(serial_lines,
224 sizeof(serial_lines)/sizeof(serial_lines[0]));
225}
226__uml_exitcall(ssl_exit);
227
228static int ssl_chan_setup(char *str)
229{
230 return(line_setup(serial_lines,
231 sizeof(serial_lines)/sizeof(serial_lines[0]),
232 str, 1));
233}
234
235__setup("ssl", ssl_chan_setup);
236__channel_help(ssl_chan_setup, "ssl");