Merge branch 'mv-merge'
[linux-2.6] / arch / um / drivers / ssl.c
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
26 static int ssl_version = 1;
27
28 /* Referenced only by tty_driver below - presumably it's locked correctly
29  * by the tty driver.
30  */
31
32 static struct tty_driver *ssl_driver;
33
34 #define NR_PORTS 64
35
36 static void 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
42 static 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
50 static int ssl_config(char *str);
51 static int ssl_get_config(char *dev, char *str, int size, char **error_out);
52 static int ssl_remove(int n);
53
54 static 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                 .id             = line_id,
73                 .remove         = ssl_remove,
74         },
75 };
76
77 /* The array is initialized by line_init, which is an initcall.  The 
78  * individual elements are protected by individual semaphores.
79  */
80 static struct line serial_lines[NR_PORTS] =
81         { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
82
83 static struct lines lines = LINES_INIT(NR_PORTS);
84
85 static int ssl_config(char *str)
86 {
87         return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts);
88 }
89
90 static int ssl_get_config(char *dev, char *str, int size, char **error_out)
91 {
92         return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
93                                size, error_out);
94 }
95
96 static int ssl_remove(int n)
97 {
98         return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n);
99 }
100
101 static int ssl_open(struct tty_struct *tty, struct file *filp)
102 {
103         return line_open(serial_lines, tty);
104 }
105
106 #if 0
107 static void ssl_flush_buffer(struct tty_struct *tty)
108 {
109         return;
110 }
111
112 static void ssl_stop(struct tty_struct *tty)
113 {
114         printk(KERN_ERR "Someone should implement ssl_stop\n");
115 }
116
117 static void ssl_start(struct tty_struct *tty)
118 {
119         printk(KERN_ERR "Someone should implement ssl_start\n");
120 }
121
122 void ssl_hangup(struct tty_struct *tty)
123 {
124 }
125 #endif
126
127 static 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  */
150 static int ssl_init_done = 0;
151
152 static 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
163 static struct tty_driver *ssl_console_device(struct console *c, int *index)
164 {
165         *index = c->index;
166         return ssl_driver;
167 }
168
169 static 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, &opts);
174 }
175
176 static struct console ssl_cons = {
177         .name           = "ttyS",
178         .write          = ssl_console_write,
179         .device         = ssl_console_device,
180         .setup          = ssl_console_setup,
181         .flags          = CON_PRINTBUFFER,
182         .index          = -1,
183 };
184
185 static int ssl_init(void)
186 {
187         char *new_title;
188
189         printk(KERN_INFO "Initializing software serial port version %d\n",
190                ssl_version);
191         ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops,
192                                          serial_lines,
193                                          ARRAY_SIZE(serial_lines));
194
195         lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts);
196
197         new_title = add_xterm_umid(opts.xterm_title);
198         if (new_title != NULL)
199                 opts.xterm_title = new_title;
200
201         ssl_init_done = 1;
202         register_console(&ssl_cons);
203         return 0;
204 }
205 late_initcall(ssl_init);
206
207 static 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
215 static int ssl_chan_setup(char *str)
216 {
217         return line_setup(serial_lines, ARRAY_SIZE(serial_lines), str);
218 }
219
220 __setup("ssl", ssl_chan_setup);
221 __channel_help(ssl_chan_setup, "ssl");