This source file includes following definitions.
- nfputs
- nfcon_write
- nfcon_device
- nfcon_tty_open
- nfcon_tty_close
- nfcon_tty_write
- nfcon_tty_put_char
- nfcon_tty_write_room
- nf_debug_setup
- nfcon_init
- nfcon_exit
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9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/console.h>
12 #include <linux/tty.h>
13 #include <linux/tty_driver.h>
14 #include <linux/tty_flip.h>
15 #include <linux/slab.h>
16 #include <linux/err.h>
17 #include <linux/uaccess.h>
18 #include <linux/io.h>
19
20 #include <asm/natfeat.h>
21
22 static int stderr_id;
23 static struct tty_port nfcon_tty_port;
24 static struct tty_driver *nfcon_tty_driver;
25
26 static void nfputs(const char *str, unsigned int count)
27 {
28 char buf[68];
29 unsigned long phys = virt_to_phys(buf);
30
31 buf[64] = 0;
32 while (count > 64) {
33 memcpy(buf, str, 64);
34 nf_call(stderr_id, phys);
35 str += 64;
36 count -= 64;
37 }
38 memcpy(buf, str, count);
39 buf[count] = 0;
40 nf_call(stderr_id, phys);
41 }
42
43 static void nfcon_write(struct console *con, const char *str,
44 unsigned int count)
45 {
46 nfputs(str, count);
47 }
48
49 static struct tty_driver *nfcon_device(struct console *con, int *index)
50 {
51 *index = 0;
52 return (con->flags & CON_ENABLED) ? nfcon_tty_driver : NULL;
53 }
54
55 static struct console nf_console = {
56 .name = "nfcon",
57 .write = nfcon_write,
58 .device = nfcon_device,
59 .flags = CON_PRINTBUFFER,
60 .index = -1,
61 };
62
63
64 static int nfcon_tty_open(struct tty_struct *tty, struct file *filp)
65 {
66 return 0;
67 }
68
69 static void nfcon_tty_close(struct tty_struct *tty, struct file *filp)
70 {
71 }
72
73 static int nfcon_tty_write(struct tty_struct *tty, const unsigned char *buf,
74 int count)
75 {
76 nfputs(buf, count);
77 return count;
78 }
79
80 static int nfcon_tty_put_char(struct tty_struct *tty, unsigned char ch)
81 {
82 char temp[2] = { ch, 0 };
83
84 nf_call(stderr_id, virt_to_phys(temp));
85 return 1;
86 }
87
88 static int nfcon_tty_write_room(struct tty_struct *tty)
89 {
90 return 64;
91 }
92
93 static const struct tty_operations nfcon_tty_ops = {
94 .open = nfcon_tty_open,
95 .close = nfcon_tty_close,
96 .write = nfcon_tty_write,
97 .put_char = nfcon_tty_put_char,
98 .write_room = nfcon_tty_write_room,
99 };
100
101 #ifndef MODULE
102
103 static int __init nf_debug_setup(char *arg)
104 {
105 if (strcmp(arg, "nfcon"))
106 return 0;
107
108 stderr_id = nf_get_id("NF_STDERR");
109 if (stderr_id) {
110 nf_console.flags |= CON_ENABLED;
111 register_console(&nf_console);
112 }
113
114 return 0;
115 }
116
117 early_param("debug", nf_debug_setup);
118
119 #endif
120
121 static int __init nfcon_init(void)
122 {
123 int res;
124
125 stderr_id = nf_get_id("NF_STDERR");
126 if (!stderr_id)
127 return -ENODEV;
128
129 nfcon_tty_driver = alloc_tty_driver(1);
130 if (!nfcon_tty_driver)
131 return -ENOMEM;
132
133 tty_port_init(&nfcon_tty_port);
134
135 nfcon_tty_driver->driver_name = "nfcon";
136 nfcon_tty_driver->name = "nfcon";
137 nfcon_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM;
138 nfcon_tty_driver->subtype = SYSTEM_TYPE_TTY;
139 nfcon_tty_driver->init_termios = tty_std_termios;
140 nfcon_tty_driver->flags = TTY_DRIVER_REAL_RAW;
141
142 tty_set_operations(nfcon_tty_driver, &nfcon_tty_ops);
143 tty_port_link_device(&nfcon_tty_port, nfcon_tty_driver, 0);
144 res = tty_register_driver(nfcon_tty_driver);
145 if (res) {
146 pr_err("failed to register nfcon tty driver\n");
147 put_tty_driver(nfcon_tty_driver);
148 tty_port_destroy(&nfcon_tty_port);
149 return res;
150 }
151
152 if (!(nf_console.flags & CON_ENABLED))
153 register_console(&nf_console);
154
155 return 0;
156 }
157
158 static void __exit nfcon_exit(void)
159 {
160 unregister_console(&nf_console);
161 tty_unregister_driver(nfcon_tty_driver);
162 put_tty_driver(nfcon_tty_driver);
163 tty_port_destroy(&nfcon_tty_port);
164 }
165
166 module_init(nfcon_init);
167 module_exit(nfcon_exit);
168
169 MODULE_LICENSE("GPL");