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