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