summaryrefslogtreecommitdiffstats
path: root/arch/um/drivers/ssl.c
blob: 16fdd0a0f9d617c67b7d99f0aa4317f2fcdfc7aa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/* 
 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#include <linux/fs.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/major.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/console.h>
#include <asm/termbits.h>
#include <asm/irq.h>
#include "ssl.h"
#include "chan.h"
#include <init.h>
#include <irq_user.h>
#include "mconsole_kern.h"

static const int ssl_version = 1;

#define NR_PORTS 64

static void ssl_announce(char *dev_name, int dev)
{
	printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
	       dev_name);
}

/* Almost const, except that xterm_title may be changed in an initcall */
static struct chan_opts opts = {
	.announce 	= ssl_announce,
	.xterm_title	= "Serial Line #%d",
	.raw		= 1,
};

static int ssl_config(char *str, char **error_out);
static int ssl_get_config(char *dev, char *str, int size, char **error_out);
static int ssl_remove(int n, char **error_out);


/* Const, except for .mc.list */
static struct line_driver driver = {
	.name 			= "UML serial line",
	.device_name 		= "ttyS",
	.major 			= TTY_MAJOR,
	.minor_start 		= 64,
	.type 		 	= TTY_DRIVER_TYPE_SERIAL,
	.subtype 	 	= 0,
	.read_irq 		= SSL_IRQ,
	.read_irq_name 		= "ssl",
	.write_irq 		= SSL_WRITE_IRQ,
	.write_irq_name 	= "ssl-write",
	.mc  = {
		.list		= LIST_HEAD_INIT(driver.mc.list),
		.name  		= "ssl",
		.config 	= ssl_config,
		.get_config 	= ssl_get_config,
		.id		= line_id,
		.remove 	= ssl_remove,
	},
};

/* The array is initialized by line_init, at initcall time.  The
 * elements are locked individually as needed.
 */
static char *conf[NR_PORTS];
static char *def_conf = CONFIG_SSL_CHAN;
static struct line serial_lines[NR_PORTS];

static int ssl_config(char *str, char **error_out)
{
	return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
			   error_out);
}

static int ssl_get_config(char *dev, char *str, int size, char **error_out)
{
	return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
			       size, error_out);
}

static int ssl_remove(int n, char **error_out)
{
	return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
			   error_out);
}

static int ssl_install(struct tty_driver *driver, struct tty_struct *tty)
{
	return line_install(driver, tty, &serial_lines[tty->index]);
}

static const struct tty_operations ssl_ops = {
	.open 	 		= line_open,
	.close 	 		= line_close,
	.write 	 		= line_write,
	.put_char 		= line_put_char,
	.write_room		= line_write_room,
	.chars_in_buffer 	= line_chars_in_buffer,
	.flush_buffer 		= line_flush_buffer,
	.flush_chars 		= line_flush_chars,
	.set_termios 		= line_set_termios,
	.throttle 		= line_throttle,
	.unthrottle 		= line_unthrottle,
	.install		= ssl_install,
	.cleanup		= line_cleanup,
	.hangup			= line_hangup,
};

/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
 * by being an initcall and exitcall, respectively.
 */
static int ssl_init_done = 0;

static void ssl_console_write(struct console *c, const char *string,
			      unsigned len)
{
	struct line *line = &serial_lines[c->index];
	unsigned long flags;

	spin_lock_irqsave(&line->lock, flags);
	console_write_chan(line->chan_out, string, len);
	spin_unlock_irqrestore(&line->lock, flags);
}

static struct tty_driver *ssl_console_device(struct console *c, int *index)
{
	*index = c->index;
	return driver.driver;
}

static int ssl_console_setup(struct console *co, char *options)
{
	struct line *line = &serial_lines[co->index];

	return console_open_chan(line, co);
}

/* No locking for register_console call - relies on single-threaded initcalls */
static struct console ssl_cons = {
	.name		= "ttyS",
	.write		= ssl_console_write,
	.device		= ssl_console_device,
	.setup		= ssl_console_setup,
	.flags		= CON_PRINTBUFFER|CON_ANYTIME,
	.index		= -1,
};

static int ssl_init(void)
{
	char *new_title;
	int err;
	int i;

	printk(KERN_INFO "Initializing software serial port version %d\n",
	       ssl_version);

	err = register_lines(&driver, &ssl_ops, serial_lines,
				    ARRAY_SIZE(serial_lines));
	if (err)
		return err;

	new_title = add_xterm_umid(opts.xterm_title);
	if (new_title != NULL)
		opts.xterm_title = new_title;

	for (i = 0; i < NR_PORTS; i++) {
		char *error;
		char *s = conf[i];
		if (!s)
			s = def_conf;
		if (setup_one_line(serial_lines, i, s, &opts, &error))
			printk(KERN_ERR "setup_one_line failed for "
			       "device %d : %s\n", i, error);
	}

	ssl_init_done = 1;
	register_console(&ssl_cons);
	return 0;
}
late_initcall(ssl_init);

static void ssl_exit(void)
{
	if (!ssl_init_done)
		return;
	close_lines(serial_lines, ARRAY_SIZE(serial_lines));
}
__uml_exitcall(ssl_exit);

static int ssl_chan_setup(char *str)
{
	line_setup(conf, NR_PORTS, &def_conf, str, "serial line");
	return 1;
}

__setup("ssl", ssl_chan_setup);
__channel_help(ssl_chan_setup, "ssl");
OpenPOWER on IntegriCloud