[PATCH] Add block_device_operations.getgeo block device method
[linux-2.6] / arch / um / drivers / tty.c
1 /* 
2  * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
3  * Licensed under the GPL
4  */
5
6 #include <stdio.h>
7 #include <termios.h>
8 #include <errno.h>
9 #include <unistd.h>
10 #include "chan_user.h"
11 #include "user_util.h"
12 #include "user.h"
13 #include "os.h"
14
15 struct tty_chan {
16         char *dev;
17         int raw;
18         struct termios tt;
19 };
20
21 static void *tty_chan_init(char *str, int device, struct chan_opts *opts)
22 {
23         struct tty_chan *data;
24
25         if(*str != ':'){
26                 printk("tty_init : channel type 'tty' must specify "
27                        "a device\n");
28                 return(NULL);
29         }
30         str++;
31
32         data = um_kmalloc(sizeof(*data));
33         if(data == NULL)
34                 return(NULL);
35         *data = ((struct tty_chan) { .dev       = str,
36                                      .raw       = opts->raw });
37                                      
38         return(data);
39 }
40
41 static int tty_open(int input, int output, int primary, void *d,
42                     char **dev_out)
43 {
44         struct tty_chan *data = d;
45         int fd, err;
46
47         fd = os_open_file(data->dev, of_set_rw(OPENFLAGS(), input, output), 0);
48         if(fd < 0) return(fd);
49         if(data->raw){
50                 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
51                 if(err)
52                         return(err);
53
54                 err = raw(fd);
55                 if(err)
56                         return(err);
57         }
58
59         *dev_out = data->dev;
60         return(fd);
61 }
62
63 struct chan_ops tty_ops = {
64         .type           = "tty",
65         .init           = tty_chan_init,
66         .open           = tty_open,
67         .close          = generic_close,
68         .read           = generic_read,
69         .write          = generic_write,
70         .console_write  = generic_console_write,
71         .window_size    = generic_window_size,
72         .free           = generic_free,
73         .winch          = 0,
74 };
75
76 /*
77  * Overrides for Emacs so that we follow Linus's tabbing style.
78  * Emacs will notice this stuff at the end of the file and automatically
79  * adjust the settings for this buffer only.  This must remain at the end
80  * of the file.
81  * ---------------------------------------------------------------------------
82  * Local variables:
83  * c-file-style: "linux"
84  * End:
85  */