Commit | Line | Data |
---|---|---|
37b0b65f RZ |
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> | |
55490050 | 18 | #include <linux/io.h> |
37b0b65f RZ |
19 | |
20 | #include <asm/natfeat.h> | |
21 | ||
22 | static int stderr_id; | |
5920c2c9 | 23 | static struct tty_port nfcon_tty_port; |
37b0b65f RZ |
24 | static struct tty_driver *nfcon_tty_driver; |
25 | ||
26 | static void nfputs(const char *str, unsigned int count) | |
27 | { | |
28 | char buf[68]; | |
55490050 | 29 | unsigned long phys = virt_to_phys(buf); |
37b0b65f RZ |
30 | |
31 | buf[64] = 0; | |
32 | while (count > 64) { | |
33 | memcpy(buf, str, 64); | |
55490050 | 34 | nf_call(stderr_id, phys); |
37b0b65f RZ |
35 | str += 64; |
36 | count -= 64; | |
37 | } | |
38 | memcpy(buf, str, count); | |
39 | buf[count] = 0; | |
55490050 | 40 | nf_call(stderr_id, phys); |
37b0b65f RZ |
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; | |
de61a1a3 | 52 | return console_is_registered(con) ? nfcon_tty_driver : NULL; |
37b0b65f RZ |
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 | ||
95713967 JSS |
73 | static ssize_t nfcon_tty_write(struct tty_struct *tty, const u8 *buf, |
74 | size_t count) | |
37b0b65f RZ |
75 | { |
76 | nfputs(buf, count); | |
77 | return count; | |
78 | } | |
79 | ||
dcaafbe6 | 80 | static int nfcon_tty_put_char(struct tty_struct *tty, u8 ch) |
37b0b65f | 81 | { |
dcaafbe6 | 82 | u8 temp[2] = { ch, 0 }; |
37b0b65f | 83 | |
55490050 | 84 | nf_call(stderr_id, virt_to_phys(temp)); |
37b0b65f RZ |
85 | return 1; |
86 | } | |
87 | ||
03b3b1a2 | 88 | static unsigned int nfcon_tty_write_room(struct tty_struct *tty) |
37b0b65f RZ |
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) { | |
de61a1a3 JO |
110 | /* |
111 | * The console will be enabled when debug=nfcon is specified | |
112 | * as a kernel parameter. Since this is a non-standard way | |
113 | * of enabling consoles, it must be explicitly enabled. | |
114 | */ | |
37b0b65f RZ |
115 | nf_console.flags |= CON_ENABLED; |
116 | register_console(&nf_console); | |
117 | } | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | early_param("debug", nf_debug_setup); | |
123 | ||
124 | #endif /* !MODULE */ | |
125 | ||
126 | static int __init nfcon_init(void) | |
127 | { | |
0524513a | 128 | struct tty_driver *driver; |
37b0b65f RZ |
129 | int res; |
130 | ||
131 | stderr_id = nf_get_id("NF_STDERR"); | |
132 | if (!stderr_id) | |
133 | return -ENODEV; | |
134 | ||
39b7b42b JS |
135 | driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW); |
136 | if (IS_ERR(driver)) | |
137 | return PTR_ERR(driver); | |
37b0b65f | 138 | |
191c5f10 JS |
139 | tty_port_init(&nfcon_tty_port); |
140 | ||
0524513a JS |
141 | driver->driver_name = "nfcon"; |
142 | driver->name = "nfcon"; | |
143 | driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
144 | driver->subtype = SYSTEM_TYPE_TTY; | |
145 | driver->init_termios = tty_std_termios; | |
37b0b65f | 146 | |
0524513a JS |
147 | tty_set_operations(driver, &nfcon_tty_ops); |
148 | tty_port_link_device(&nfcon_tty_port, driver, 0); | |
149 | res = tty_register_driver(driver); | |
37b0b65f RZ |
150 | if (res) { |
151 | pr_err("failed to register nfcon tty driver\n"); | |
9f90a4dd | 152 | tty_driver_kref_put(driver); |
191c5f10 | 153 | tty_port_destroy(&nfcon_tty_port); |
37b0b65f RZ |
154 | return res; |
155 | } | |
156 | ||
0524513a JS |
157 | nfcon_tty_driver = driver; |
158 | ||
de61a1a3 | 159 | if (!console_is_registered(&nf_console)) |
37b0b65f RZ |
160 | register_console(&nf_console); |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static void __exit nfcon_exit(void) | |
166 | { | |
167 | unregister_console(&nf_console); | |
168 | tty_unregister_driver(nfcon_tty_driver); | |
9f90a4dd | 169 | tty_driver_kref_put(nfcon_tty_driver); |
191c5f10 | 170 | tty_port_destroy(&nfcon_tty_port); |
37b0b65f RZ |
171 | } |
172 | ||
173 | module_init(nfcon_init); | |
174 | module_exit(nfcon_exit); | |
175 | ||
176 | MODULE_LICENSE("GPL"); |