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/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_util.h"
19#include "kern.h"
20#include "init.h"
21#include "irq_user.h"
22#include "mconsole_kern.h"
23
24static const int ssl_version = 1;
25
26/* Referenced only by tty_driver below - presumably it's locked correctly
27 * by the tty driver.
28 */
29
30static struct tty_driver *ssl_driver;
31
32#define NR_PORTS 64
33
34static void ssl_announce(char *dev_name, int dev)
35{
36 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
37 dev_name);
38}
39
40/* Almost const, except that xterm_title may be changed in an initcall */
41static struct chan_opts opts = {
42 .announce = ssl_announce,
43 .xterm_title = "Serial Line #%d",
44 .raw = 1,
45};
46
47static int ssl_config(char *str, char **error_out);
48static int ssl_get_config(char *dev, char *str, int size, char **error_out);
49static int ssl_remove(int n, char **error_out);
50
51
52/* Const, except for .mc.list */
53static struct line_driver driver = {
54 .name = "UML serial line",
55 .device_name = "ttyS",
56 .major = TTY_MAJOR,
57 .minor_start = 64,
58 .type = TTY_DRIVER_TYPE_SERIAL,
59 .subtype = 0,
60 .read_irq = SSL_IRQ,
61 .read_irq_name = "ssl",
62 .write_irq = SSL_WRITE_IRQ,
63 .write_irq_name = "ssl-write",
64 .mc = {
65 .list = LIST_HEAD_INIT(driver.mc.list),
66 .name = "ssl",
67 .config = ssl_config,
68 .get_config = ssl_get_config,
69 .id = line_id,
70 .remove = ssl_remove,
71 },
72};
73
74/* The array is initialized by line_init, at initcall time. The
75 * elements are locked individually as needed.
76 */
77static struct line serial_lines[NR_PORTS] =
78 { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
79
80static int ssl_config(char *str, char **error_out)
81{
82 return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
83 error_out);
84}
85
86static int ssl_get_config(char *dev, char *str, int size, char **error_out)
87{
88 return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
89 size, error_out);
90}
91
92static int ssl_remove(int n, char **error_out)
93{
94 return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
95 error_out);
96}
97
98static int ssl_open(struct tty_struct *tty, struct file *filp)
99{
100 int err = line_open(serial_lines, tty);
101
102 if (err)
103 printk(KERN_ERR "Failed to open serial line %d, err = %d\n",
104 tty->index, err);
105
106 return err;
107}
108
109#if 0
110static void ssl_flush_buffer(struct tty_struct *tty)
111{
112 return;
113}
114
115static void ssl_stop(struct tty_struct *tty)
116{
117 printk(KERN_ERR "Someone should implement ssl_stop\n");
118}
119
120static void ssl_start(struct tty_struct *tty)
121{
122 printk(KERN_ERR "Someone should implement ssl_start\n");
123}
124
125void ssl_hangup(struct tty_struct *tty)
126{
127}
128#endif
129
130static const struct tty_operations ssl_ops = {
131 .open = ssl_open,
132 .close = line_close,
133 .write = line_write,
134 .put_char = line_put_char,
135 .write_room = line_write_room,
136 .chars_in_buffer = line_chars_in_buffer,
137 .flush_buffer = line_flush_buffer,
138 .flush_chars = line_flush_chars,
139 .set_termios = line_set_termios,
140 .ioctl = line_ioctl,
141 .throttle = line_throttle,
142 .unthrottle = line_unthrottle,
143#if 0
144 .stop = ssl_stop,
145 .start = ssl_start,
146 .hangup = ssl_hangup,
147#endif
148};
149
150/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
151 * by being an initcall and exitcall, respectively.
152 */
153static int ssl_init_done = 0;
154
155static void ssl_console_write(struct console *c, const char *string,
156 unsigned len)
157{
158 struct line *line = &serial_lines[c->index];
159 unsigned long flags;
160
161 spin_lock_irqsave(&line->lock, flags);
162 console_write_chan(&line->chan_list, string, len);
163 spin_unlock_irqrestore(&line->lock, flags);
164}
165
166static struct tty_driver *ssl_console_device(struct console *c, int *index)
167{
168 *index = c->index;
169 return ssl_driver;
170}
171
172static int ssl_console_setup(struct console *co, char *options)
173{
174 struct line *line = &serial_lines[co->index];
175
176 return console_open_chan(line, co);
177}
178
179/* No locking for register_console call - relies on single-threaded initcalls */
180static struct console ssl_cons = {
181 .name = "ttyS",
182 .write = ssl_console_write,
183 .device = ssl_console_device,
184 .setup = ssl_console_setup,
185 .flags = CON_PRINTBUFFER|CON_ANYTIME,
186 .index = -1,
187};
188
189static int ssl_init(void)
190{
191 char *new_title;
192
193 printk(KERN_INFO "Initializing software serial port version %d\n",
194 ssl_version);
195 ssl_driver = register_lines(&driver, &ssl_ops, serial_lines,
196 ARRAY_SIZE(serial_lines));
197
198 new_title = add_xterm_umid(opts.xterm_title);
199 if (new_title != NULL)
200 opts.xterm_title = new_title;
201
202 lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts);
203
204 ssl_init_done = 1;
205 register_console(&ssl_cons);
206 return 0;
207}
208late_initcall(ssl_init);
209
210static void ssl_exit(void)
211{
212 if (!ssl_init_done)
213 return;
214 close_lines(serial_lines, ARRAY_SIZE(serial_lines));
215}
216__uml_exitcall(ssl_exit);
217
218static int ssl_chan_setup(char *str)
219{
220 char *error;
221 int ret;
222
223 ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error);
224 if(ret < 0)
225 printk(KERN_ERR "Failed to set up serial line with "
226 "configuration string \"%s\" : %s\n", str, error);
227
228 return 1;
229}
230
231__setup("ssl", ssl_chan_setup);
232__channel_help(ssl_chan_setup, "ssl");