Merge with rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[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 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(char *str);
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                 .remove         = ssl_remove,
73         },
74 };
75
76 /* The array is initialized by line_init, which is an initcall.  The 
77  * individual elements are protected by individual semaphores.
78  */
79 static struct line serial_lines[NR_PORTS] =
80         { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
81
82 static struct lines lines = LINES_INIT(NR_PORTS);
83
84 static int ssl_config(char *str)
85 {
86         return(line_config(serial_lines, 
87                            sizeof(serial_lines)/sizeof(serial_lines[0]), str));
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, 
93                                sizeof(serial_lines)/sizeof(serial_lines[0]), 
94                                str, size, error_out));
95 }
96
97 static int ssl_remove(char *str)
98 {
99         return(line_remove(serial_lines, 
100                            sizeof(serial_lines)/sizeof(serial_lines[0]), str));
101 }
102
103 int ssl_open(struct tty_struct *tty, struct file *filp)
104 {
105         return line_open(serial_lines, tty, &opts);
106 }
107
108 #if 0
109 static void ssl_flush_buffer(struct tty_struct *tty)
110 {
111         return;
112 }
113
114 static void ssl_throttle(struct tty_struct * tty)
115 {
116         printk(KERN_ERR "Someone should implement ssl_throttle\n");
117 }
118
119 static void ssl_unthrottle(struct tty_struct * tty)
120 {
121         printk(KERN_ERR "Someone should implement ssl_unthrottle\n");
122 }
123
124 static void ssl_stop(struct tty_struct *tty)
125 {
126         printk(KERN_ERR "Someone should implement ssl_stop\n");
127 }
128
129 static void ssl_start(struct tty_struct *tty)
130 {
131         printk(KERN_ERR "Someone should implement ssl_start\n");
132 }
133
134 void ssl_hangup(struct tty_struct *tty)
135 {
136 }
137 #endif
138
139 static struct tty_operations ssl_ops = {
140         .open                   = ssl_open,
141         .close                  = line_close,
142         .write                  = line_write,
143         .put_char               = line_put_char,
144         .write_room             = line_write_room,
145         .chars_in_buffer        = line_chars_in_buffer,
146         .flush_buffer           = line_flush_buffer,
147         .flush_chars            = line_flush_chars,
148         .set_termios            = line_set_termios,
149         .ioctl                  = line_ioctl,
150 #if 0
151         .throttle               = ssl_throttle,
152         .unthrottle             = ssl_unthrottle,
153         .stop                   = ssl_stop,
154         .start                  = ssl_start,
155         .hangup                 = ssl_hangup,
156 #endif
157 };
158
159 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized
160  * by being an initcall and exitcall, respectively.
161  */
162 static int ssl_init_done = 0;
163
164 static void ssl_console_write(struct console *c, const char *string,
165                               unsigned len)
166 {
167         struct line *line = &serial_lines[c->index];
168         unsigned long flags;
169
170         spin_lock_irqsave(&line->lock, flags);
171         console_write_chan(&line->chan_list, string, len);
172         spin_unlock_irqrestore(&line->lock, flags);
173 }
174
175 static struct tty_driver *ssl_console_device(struct console *c, int *index)
176 {
177         *index = c->index;
178         return ssl_driver;
179 }
180
181 static int ssl_console_setup(struct console *co, char *options)
182 {
183         struct line *line = &serial_lines[co->index];
184
185         return console_open_chan(line,co,&opts);
186 }
187
188 static struct console ssl_cons = {
189         .name           = "ttyS",
190         .write          = ssl_console_write,
191         .device         = ssl_console_device,
192         .setup          = ssl_console_setup,
193         .flags          = CON_PRINTBUFFER,
194         .index          = -1,
195 };
196
197 int ssl_init(void)
198 {
199         char *new_title;
200
201         printk(KERN_INFO "Initializing software serial port version %d\n", 
202                ssl_version);
203         ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops,
204                                          serial_lines, ARRAY_SIZE(serial_lines));
205
206         lines_init(serial_lines, sizeof(serial_lines)/sizeof(serial_lines[0]));
207
208         new_title = add_xterm_umid(opts.xterm_title);
209         if (new_title != NULL)
210                 opts.xterm_title = new_title;
211
212         ssl_init_done = 1;
213         register_console(&ssl_cons);
214         return(0);
215 }
216 late_initcall(ssl_init);
217
218 static void ssl_exit(void)
219 {
220         if (!ssl_init_done)
221                 return;
222         close_lines(serial_lines,
223                     sizeof(serial_lines)/sizeof(serial_lines[0]));
224 }
225 __uml_exitcall(ssl_exit);
226
227 static int ssl_chan_setup(char *str)
228 {
229         return(line_setup(serial_lines,
230                           sizeof(serial_lines)/sizeof(serial_lines[0]),
231                           str, 1));
232 }
233
234 __setup("ssl", ssl_chan_setup);
235 __channel_help(ssl_chan_setup, "ssl");