1 /*
2 * ARAnyM console driver
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file COPYING in the main directory of this archive
6 * for more details.
7 */
8
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
nfputs(const char * str,unsigned int count)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
nfcon_write(struct console * con,const char * str,unsigned int count)43 static void nfcon_write(struct console *con, const char *str,
44 unsigned int count)
45 {
46 nfputs(str, count);
47 }
48
nfcon_device(struct console * con,int * index)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
nfcon_tty_open(struct tty_struct * tty,struct file * filp)64 static int nfcon_tty_open(struct tty_struct *tty, struct file *filp)
65 {
66 return 0;
67 }
68
nfcon_tty_close(struct tty_struct * tty,struct file * filp)69 static void nfcon_tty_close(struct tty_struct *tty, struct file *filp)
70 {
71 }
72
nfcon_tty_write(struct tty_struct * tty,const unsigned char * buf,int count)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
nfcon_tty_put_char(struct tty_struct * tty,unsigned char ch)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
nfcon_tty_write_room(struct tty_struct * tty)88 static unsigned 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
nf_debug_setup(char * arg)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 /* !MODULE */
120
nfcon_init(void)121 static int __init nfcon_init(void)
122 {
123 struct tty_driver *driver;
124 int res;
125
126 stderr_id = nf_get_id("NF_STDERR");
127 if (!stderr_id)
128 return -ENODEV;
129
130 driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
131 if (IS_ERR(driver))
132 return PTR_ERR(driver);
133
134 tty_port_init(&nfcon_tty_port);
135
136 driver->driver_name = "nfcon";
137 driver->name = "nfcon";
138 driver->type = TTY_DRIVER_TYPE_SYSTEM;
139 driver->subtype = SYSTEM_TYPE_TTY;
140 driver->init_termios = tty_std_termios;
141
142 tty_set_operations(driver, &nfcon_tty_ops);
143 tty_port_link_device(&nfcon_tty_port, driver, 0);
144 res = tty_register_driver(driver);
145 if (res) {
146 pr_err("failed to register nfcon tty driver\n");
147 tty_driver_kref_put(driver);
148 tty_port_destroy(&nfcon_tty_port);
149 return res;
150 }
151
152 nfcon_tty_driver = driver;
153
154 if (!(nf_console.flags & CON_ENABLED))
155 register_console(&nf_console);
156
157 return 0;
158 }
159
nfcon_exit(void)160 static void __exit nfcon_exit(void)
161 {
162 unregister_console(&nf_console);
163 tty_unregister_driver(nfcon_tty_driver);
164 tty_driver_kref_put(nfcon_tty_driver);
165 tty_port_destroy(&nfcon_tty_port);
166 }
167
168 module_init(nfcon_init);
169 module_exit(nfcon_exit);
170
171 MODULE_LICENSE("GPL");
172
