summaryrefslogtreecommitdiffstats
path: root/arch/m68k/emu/nfcon.c
blob: ab20dc0ff63bd47075075390abf074b735bb2850 (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
/*
 * ARAnyM console driver
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/uaccess.h>

#include <asm/natfeat.h>

static int stderr_id;
static struct tty_driver *nfcon_tty_driver;

static void nfputs(const char *str, unsigned int count)
{
	char buf[68];

	buf[64] = 0;
	while (count > 64) {
		memcpy(buf, str, 64);
		nf_call(stderr_id, buf);
		str += 64;
		count -= 64;
	}
	memcpy(buf, str, count);
	buf[count] = 0;
	nf_call(stderr_id, buf);
}

static void nfcon_write(struct console *con, const char *str,
			unsigned int count)
{
	nfputs(str, count);
}

static struct tty_driver *nfcon_device(struct console *con, int *index)
{
	*index = 0;
	return (con->flags & CON_ENABLED) ? nfcon_tty_driver : NULL;
}

static struct console nf_console = {
	.name	= "nfcon",
	.write	= nfcon_write,
	.device	= nfcon_device,
	.flags	= CON_PRINTBUFFER,
	.index	= -1,
};


static int nfcon_tty_open(struct tty_struct *tty, struct file *filp)
{
	return 0;
}

static void nfcon_tty_close(struct tty_struct *tty, struct file *filp)
{
}

static int nfcon_tty_write(struct tty_struct *tty, const unsigned char *buf,
			   int count)
{
	nfputs(buf, count);
	return count;
}

static int nfcon_tty_put_char(struct tty_struct *tty, unsigned char ch)
{
	char temp[2] = { ch, 0 };

	nf_call(stderr_id, temp);
	return 1;
}

static int nfcon_tty_write_room(struct tty_struct *tty)
{
	return 64;
}

static const struct tty_operations nfcon_tty_ops = {
	.open		= nfcon_tty_open,
	.close		= nfcon_tty_close,
	.write		= nfcon_tty_write,
	.put_char	= nfcon_tty_put_char,
	.write_room	= nfcon_tty_write_room,
};

#ifndef MODULE

static int __init nf_debug_setup(char *arg)
{
	if (strcmp(arg, "nfcon"))
		return 0;

	stderr_id = nf_get_id("NF_STDERR");
	if (stderr_id) {
		nf_console.flags |= CON_ENABLED;
		register_console(&nf_console);
	}

	return 0;
}

early_param("debug", nf_debug_setup);

#endif /* !MODULE */

static int __init nfcon_init(void)
{
	int res;

	stderr_id = nf_get_id("NF_STDERR");
	if (!stderr_id)
		return -ENODEV;

	nfcon_tty_driver = alloc_tty_driver(1);
	if (!nfcon_tty_driver)
		return -ENOMEM;

	nfcon_tty_driver->owner = THIS_MODULE;
	nfcon_tty_driver->driver_name = "nfcon";
	nfcon_tty_driver->name = "nfcon";
	nfcon_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM;
	nfcon_tty_driver->subtype = SYSTEM_TYPE_TTY;
	nfcon_tty_driver->init_termios = tty_std_termios;
	nfcon_tty_driver->flags = TTY_DRIVER_REAL_RAW;

	tty_set_operations(nfcon_tty_driver, &nfcon_tty_ops);
	res = tty_register_driver(nfcon_tty_driver);
	if (res) {
		pr_err("failed to register nfcon tty driver\n");
		put_tty_driver(nfcon_tty_driver);
		return res;
	}

	if (!(nf_console.flags & CON_ENABLED))
		register_console(&nf_console);

	return 0;
}

static void __exit nfcon_exit(void)
{
	unregister_console(&nf_console);
	tty_unregister_driver(nfcon_tty_driver);
	put_tty_driver(nfcon_tty_driver);
}

module_init(nfcon_init);
module_exit(nfcon_exit);

MODULE_LICENSE("GPL");