Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / um / drivers / tty.c
1 /*
2  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
3  * Licensed under the GPL
4  */
5
6 #include <errno.h>
7 #include <fcntl.h>
8 #include <termios.h>
9 #include "chan_user.h"
10 #include <os.h>
11 #include <um_malloc.h>
12
13 struct tty_chan {
14         char *dev;
15         int raw;
16         struct termios tt;
17 };
18
19 static void *tty_chan_init(char *str, int device, const struct chan_opts *opts)
20 {
21         struct tty_chan *data;
22
23         if (*str != ':') {
24                 printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify "
25                        "a device\n");
26                 return NULL;
27         }
28         str++;
29
30         data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
31         if (data == NULL)
32                 return NULL;
33         *data = ((struct tty_chan) { .dev       = str,
34                                      .raw       = opts->raw });
35
36         return data;
37 }
38
39 static int tty_open(int input, int output, int primary, void *d,
40                     char **dev_out)
41 {
42         struct tty_chan *data = d;
43         int fd, err, mode = 0;
44
45         if (input && output)
46                 mode = O_RDWR;
47         else if (input)
48                 mode = O_RDONLY;
49         else if (output)
50                 mode = O_WRONLY;
51
52         fd = open(data->dev, mode);
53         if (fd < 0)
54                 return -errno;
55
56         if (data->raw) {
57                 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
58                 if (err)
59                         return err;
60
61                 err = raw(fd);
62                 if (err)
63                         return err;
64         }
65
66         *dev_out = data->dev;
67         return fd;
68 }
69
70 const struct chan_ops tty_ops = {
71         .type           = "tty",
72         .init           = tty_chan_init,
73         .open           = tty_open,
74         .close          = generic_close,
75         .read           = generic_read,
76         .write          = generic_write,
77         .console_write  = generic_console_write,
78         .window_size    = generic_window_size,
79         .free           = generic_free,
80         .winch          = 0,
81 };