Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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/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_util.h"
19 #include "kern.h"
20 #include "init.h"
21 #include "irq_user.h"
22 #include "mconsole_kern.h"
23
24 static const int ssl_version = 1;
25
26 /* Referenced only by tty_driver below - presumably it's locked correctly
27  * by the tty driver.
28  */
29
30 static struct tty_driver *ssl_driver;
31
32 #define NR_PORTS 64
33
34 static void ssl_announce(char *dev_name, int dev)
35 {
36         printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
37                dev_name);
38 }
39
40 /* Almost const, except that xterm_title may be changed in an initcall */
41 static struct chan_opts opts = {
42         .announce       = ssl_announce,
43         .xterm_title    = "Serial Line #%d",
44         .raw            = 1,
45         .tramp_stack    = 0,
46         .in_kernel      = 1,
47 };
48
49 static int ssl_config(char *str, char **error_out);
50 static int ssl_get_config(char *dev, char *str, int size, char **error_out);
51 static int ssl_remove(int n, char **error_out);
52
53
54 /* Const, except for .mc.list */
55 static struct line_driver driver = {
56         .name                   = "UML serial line",
57         .device_name            = "ttyS",
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         .mc  = {
67                 .list           = LIST_HEAD_INIT(driver.mc.list),
68                 .name           = "ssl",
69                 .config         = ssl_config,
70                 .get_config     = ssl_get_config,
71                 .id             = line_id,
72                 .remove         = ssl_remove,
73         },
74 };
75
76 /* The array is initialized by line_init, at initcall time.  The
77  * elements are locked individually as needed.
78  */
79 static struct line serial_lines[NR_PORTS] =
80         { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
81
82 static int ssl_config(char *str, char **error_out)
83 {
84         return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
85                            error_out);
86 }
87
88 static int ssl_get_config(char *dev, char *str, int size, char **error_out)
89 {
90         return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
91                                size, error_out);
92 }
93
94 static int ssl_remove(int n, char **error_out)
95 {
96         return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
97                            error_out);
98 }
99
100 static int ssl_open(struct tty_struct *tty, struct file *filp)
101 {
102         return line_open(serial_lines, tty);
103 }
104
105 #if 0
106 static void ssl_flush_buffer(struct tty_struct *tty)
107 {
108         return;
109 }
110
111 static void ssl_stop(struct tty_struct *tty)
112 {
113         printk(KERN_ERR "Someone should implement ssl_stop\n");
114 }
115
116 static void ssl_start(struct tty_struct *tty)
117 {
118         printk(KERN_ERR "Someone should implement ssl_start\n");
119 }
120
121 void ssl_hangup(struct tty_struct *tty)
122 {
123 }
124 #endif
125
126 static const struct tty_operations ssl_ops = {
127         .open                   = ssl_open,
128         .close                  = line_close,
129         .write                  = line_write,
130         .put_char               = line_put_char,
131         .write_room             = line_write_room,
132         .chars_in_buffer        = line_chars_in_buffer,
133         .flush_buffer           = line_flush_buffer,
134         .flush_chars            = line_flush_chars,
135         .set_termios            = line_set_termios,
136         .ioctl                  = line_ioctl,
137         .throttle               = line_throttle,
138         .unthrottle             = line_unthrottle,
139 #if 0
140         .stop                   = ssl_stop,
141         .start                  = ssl_start,
142         .hangup                 = ssl_hangup,
143 #endif
144 };
145
146 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized
147  * by being an initcall and exitcall, respectively.
148  */
149 static int ssl_init_done = 0;
150
151 static void ssl_console_write(struct console *c, const char *string,
152                               unsigned len)
153 {
154         struct line *line = &serial_lines[c->index];
155         unsigned long flags;
156
157         spin_lock_irqsave(&line->lock, flags);
158         console_write_chan(&line->chan_list, string, len);
159         spin_unlock_irqrestore(&line->lock, flags);
160 }
161
162 static struct tty_driver *ssl_console_device(struct console *c, int *index)
163 {
164         *index = c->index;
165         return ssl_driver;
166 }
167
168 static int ssl_console_setup(struct console *co, char *options)
169 {
170         struct line *line = &serial_lines[co->index];
171
172         return console_open_chan(line, co);
173 }
174
175 /* No locking for register_console call - relies on single-threaded initcalls */
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|CON_ANYTIME,
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 = register_lines(&driver, &ssl_ops, serial_lines,
192                                     ARRAY_SIZE(serial_lines));
193
194         new_title = add_xterm_umid(opts.xterm_title);
195         if (new_title != NULL)
196                 opts.xterm_title = new_title;
197
198         lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts);
199
200         ssl_init_done = 1;
201         register_console(&ssl_cons);
202         return 0;
203 }
204 late_initcall(ssl_init);
205
206 static void ssl_exit(void)
207 {
208         if (!ssl_init_done)
209                 return;
210         close_lines(serial_lines, ARRAY_SIZE(serial_lines));
211 }
212 __uml_exitcall(ssl_exit);
213
214 static int ssl_chan_setup(char *str)
215 {
216         char *error;
217         int ret;
218
219         ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error);
220         if(ret < 0)
221                 printk(KERN_ERR "Failed to set up serial line with "
222                        "configuration string \"%s\" : %s\n", str, error);
223
224         return 1;
225 }
226
227 __setup("ssl", ssl_chan_setup);
228 __channel_help(ssl_chan_setup, "ssl");