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(char *str);
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 .remove = ssl_remove,
73 },
74};
75
76/* The array is initialized by line_init, which is an initcall. The
77 * individual elements are protected by individual semaphores.
78 */
79static struct line serial_lines[NR_PORTS] =
80 { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
81
82static struct lines lines = LINES_INIT(NR_PORTS);
83
84static int ssl_config(char *str)
85{
86 return(line_config(serial_lines,
87 sizeof(serial_lines)/sizeof(serial_lines[0]), str));
88}
89
90static int ssl_get_config(char *dev, char *str, int size, char **error_out)
91{
92 return(line_get_config(dev, serial_lines,
93 sizeof(serial_lines)/sizeof(serial_lines[0]),
94 str, size, error_out));
95}
96
97static int ssl_remove(char *str)
98{
99 return(line_remove(serial_lines,
100 sizeof(serial_lines)/sizeof(serial_lines[0]), str));
101}
102
103int ssl_open(struct tty_struct *tty, struct file *filp)
104{
105 return line_open(serial_lines, tty, &opts);
106}
107
108#if 0
109static void ssl_flush_buffer(struct tty_struct *tty)
110{
111 return;
112}
113
114static void ssl_throttle(struct tty_struct * tty)
115{
116 printk(KERN_ERR "Someone should implement ssl_throttle\n");
117}
118
119static void ssl_unthrottle(struct tty_struct * tty)
120{
121 printk(KERN_ERR "Someone should implement ssl_unthrottle\n");
122}
123
124static void ssl_stop(struct tty_struct *tty)
125{
126 printk(KERN_ERR "Someone should implement ssl_stop\n");
127}
128
129static void ssl_start(struct tty_struct *tty)
130{
131 printk(KERN_ERR "Someone should implement ssl_start\n");
132}
133
134void ssl_hangup(struct tty_struct *tty)
135{
136}
137#endif
138
139static struct tty_operations ssl_ops = {
140 .open = ssl_open,
141 .close = line_close,
142 .write = line_write,
143 .put_char = line_put_char,
144 .write_room = line_write_room,
145 .chars_in_buffer = line_chars_in_buffer,
146 .flush_buffer = line_flush_buffer,
147 .flush_chars = line_flush_chars,
148 .set_termios = line_set_termios,
149 .ioctl = line_ioctl,
150#if 0
151 .throttle = ssl_throttle,
152 .unthrottle = ssl_unthrottle,
153 .stop = ssl_stop,
154 .start = ssl_start,
155 .hangup = ssl_hangup,
156#endif
157};
158
159/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
160 * by being an initcall and exitcall, respectively.
161 */
162static int ssl_init_done = 0;
163
164static void ssl_console_write(struct console *c, const char *string,
165 unsigned len)
166{
167 struct line *line = &serial_lines[c->index];
168 unsigned long flags;
169
170 spin_lock_irqsave(&line->lock, flags);
171 console_write_chan(&line->chan_list, string, len);
172 spin_unlock_irqrestore(&line->lock, flags);
173}
174
175static struct tty_driver *ssl_console_device(struct console *c, int *index)
176{
177 *index = c->index;
178 return ssl_driver;
179}
180
181static int ssl_console_setup(struct console *co, char *options)
182{
183 struct line *line = &serial_lines[co->index];
184
185 return console_open_chan(line,co,&opts);
186}
187
188static struct console ssl_cons = {
189 .name = "ttyS",
190 .write = ssl_console_write,
191 .device = ssl_console_device,
192 .setup = ssl_console_setup,
193 .flags = CON_PRINTBUFFER,
194 .index = -1,
195};
196
197int ssl_init(void)
198{
199 char *new_title;
200
201 printk(KERN_INFO "Initializing software serial port version %d\n",
202 ssl_version);
203 ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops,
204 serial_lines, ARRAY_SIZE(serial_lines));
205
206 lines_init(serial_lines, sizeof(serial_lines)/sizeof(serial_lines[0]));
207
208 new_title = add_xterm_umid(opts.xterm_title);
209 if (new_title != NULL)
210 opts.xterm_title = new_title;
211
212 ssl_init_done = 1;
213 register_console(&ssl_cons);
214 return(0);
215}
216late_initcall(ssl_init);
217
218static void ssl_exit(void)
219{
220 if (!ssl_init_done)
221 return;
222 close_lines(serial_lines,
223 sizeof(serial_lines)/sizeof(serial_lines[0]));
224}
225__uml_exitcall(ssl_exit);
226
227static int ssl_chan_setup(char *str)
228{
229 return(line_setup(serial_lines,
230 sizeof(serial_lines)/sizeof(serial_lines[0]),
231 str, 1));
232}
233
234__setup("ssl", ssl_chan_setup);
235__channel_help(ssl_chan_setup, "ssl");