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.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#if 0
109static void ssl_flush_buffer(struct tty_struct *tty)
110{
111 return;
112}
113
114static void ssl_stop(struct tty_struct *tty)
115{
116 printk(KERN_ERR "Someone should implement ssl_stop\n");
117}
118
119static void ssl_start(struct tty_struct *tty)
120{
121 printk(KERN_ERR "Someone should implement ssl_start\n");
122}
123
124void ssl_hangup(struct tty_struct *tty)
125{
126}
127#endif
128
129static const struct tty_operations ssl_ops = {
130 .open = ssl_open,
131 .close = line_close,
132 .write = line_write,
133 .put_char = line_put_char,
134 .write_room = line_write_room,
135 .chars_in_buffer = line_chars_in_buffer,
136 .flush_buffer = line_flush_buffer,
137 .flush_chars = line_flush_chars,
138 .set_termios = line_set_termios,
139 .ioctl = line_ioctl,
140 .throttle = line_throttle,
141 .unthrottle = line_unthrottle,
142#if 0
143 .stop = ssl_stop,
144 .start = ssl_start,
145 .hangup = ssl_hangup,
146#endif
147};
148
149/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
150 * by being an initcall and exitcall, respectively.
151 */
152static int ssl_init_done = 0;
153
154static void ssl_console_write(struct console *c, const char *string,
155 unsigned len)
156{
157 struct line *line = &serial_lines[c->index];
158 unsigned long flags;
159
160 spin_lock_irqsave(&line->lock, flags);
161 console_write_chan(&line->chan_list, string, len);
162 spin_unlock_irqrestore(&line->lock, flags);
163}
164
165static struct tty_driver *ssl_console_device(struct console *c, int *index)
166{
167 *index = c->index;
168 return ssl_driver;
169}
170
171static int ssl_console_setup(struct console *co, char *options)
172{
173 struct line *line = &serial_lines[co->index];
174
175 return console_open_chan(line, co);
176}
177
178/* No locking for register_console call - relies on single-threaded initcalls */
179static struct console ssl_cons = {
180 .name = "ttyS",
181 .write = ssl_console_write,
182 .device = ssl_console_device,
183 .setup = ssl_console_setup,
184 .flags = CON_PRINTBUFFER|CON_ANYTIME,
185 .index = -1,
186};
187
188static int ssl_init(void)
189{
190 char *new_title;
191
192 printk(KERN_INFO "Initializing software serial port version %d\n",
193 ssl_version);
194 ssl_driver = register_lines(&driver, &ssl_ops, serial_lines,
195 ARRAY_SIZE(serial_lines));
196
197 new_title = add_xterm_umid(opts.xterm_title);
198 if (new_title != NULL)
199 opts.xterm_title = new_title;
200
201 lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts);
202
203 ssl_init_done = 1;
204 register_console(&ssl_cons);
205 return 0;
206}
207late_initcall(ssl_init);
208
209static void ssl_exit(void)
210{
211 if (!ssl_init_done)
212 return;
213 close_lines(serial_lines, ARRAY_SIZE(serial_lines));
214}
215__uml_exitcall(ssl_exit);
216
217static int ssl_chan_setup(char *str)
218{
219 char *error;
220 int ret;
221
222 ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error);
223 if(ret < 0)
224 printk(KERN_ERR "Failed to set up serial line with "
225 "configuration string \"%s\" : %s\n", str, error);
226
227 return 1;
228}
229
230__setup("ssl", ssl_chan_setup);
231__channel_help(ssl_chan_setup, "ssl");