| 1 |
1275 |
phoenix |
/*
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| 2 |
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* linux/drivers/char/vc_screen.c
|
| 3 |
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*
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| 4 |
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* Provide access to virtual console memory.
|
| 5 |
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* /dev/vcs0: the screen as it is being viewed right now (possibly scrolled)
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| 6 |
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* /dev/vcsN: the screen of /dev/ttyN (1 <= N <= 63)
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| 7 |
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* [minor: N]
|
| 8 |
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*
|
| 9 |
|
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* /dev/vcsaN: idem, but including attributes, and prefixed with
|
| 10 |
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* the 4 bytes lines,columns,x,y (as screendump used to give).
|
| 11 |
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* Attribute/character pair is in native endianity.
|
| 12 |
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* [minor: N+128]
|
| 13 |
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*
|
| 14 |
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* This replaces screendump and part of selection, so that the system
|
| 15 |
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* administrator can control access using file system permissions.
|
| 16 |
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*
|
| 17 |
|
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* aeb@cwi.nl - efter Friedas begravelse - 950211
|
| 18 |
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*
|
| 19 |
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* machek@k332.feld.cvut.cz - modified not to send characters to wrong console
|
| 20 |
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* - fixed some fatal off-by-one bugs (0-- no longer == -1 -> looping and looping and looping...)
|
| 21 |
|
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* - making it shorter - scr_readw are macros which expand in PRETTY long code
|
| 22 |
|
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*/
|
| 23 |
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| 24 |
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#include <linux/config.h>
|
| 25 |
|
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#include <linux/kernel.h>
|
| 26 |
|
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#include <linux/major.h>
|
| 27 |
|
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#include <linux/errno.h>
|
| 28 |
|
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#include <linux/tty.h>
|
| 29 |
|
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#include <linux/devfs_fs_kernel.h>
|
| 30 |
|
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#include <linux/sched.h>
|
| 31 |
|
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#include <linux/interrupt.h>
|
| 32 |
|
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#include <linux/mm.h>
|
| 33 |
|
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#include <linux/init.h>
|
| 34 |
|
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#include <linux/vt_kern.h>
|
| 35 |
|
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#include <linux/console_struct.h>
|
| 36 |
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#include <linux/selection.h>
|
| 37 |
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#include <linux/kbd_kern.h>
|
| 38 |
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#include <linux/console.h>
|
| 39 |
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#include <asm/uaccess.h>
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| 40 |
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#include <asm/byteorder.h>
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| 41 |
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#include <asm/unaligned.h>
|
| 42 |
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|
| 43 |
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#undef attr
|
| 44 |
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#undef org
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| 45 |
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#undef addr
|
| 46 |
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#define HEADER_SIZE 4
|
| 47 |
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|
| 48 |
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static int
|
| 49 |
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vcs_size(struct inode *inode)
|
| 50 |
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{
|
| 51 |
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int size;
|
| 52 |
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int currcons = MINOR(inode->i_rdev) & 127;
|
| 53 |
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if (currcons == 0)
|
| 54 |
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currcons = fg_console;
|
| 55 |
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else
|
| 56 |
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currcons--;
|
| 57 |
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if (!vc_cons_allocated(currcons))
|
| 58 |
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return -ENXIO;
|
| 59 |
|
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|
| 60 |
|
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size = video_num_lines * video_num_columns;
|
| 61 |
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|
| 62 |
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if (MINOR(inode->i_rdev) & 128)
|
| 63 |
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size = 2*size + HEADER_SIZE;
|
| 64 |
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return size;
|
| 65 |
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}
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| 66 |
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|
|
| 67 |
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static loff_t vcs_lseek(struct file *file, loff_t offset, int orig)
|
| 68 |
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{
|
| 69 |
|
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int size = vcs_size(file->f_dentry->d_inode);
|
| 70 |
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|
| 71 |
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switch (orig) {
|
| 72 |
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default:
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| 73 |
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return -EINVAL;
|
| 74 |
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case 2:
|
| 75 |
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offset += size;
|
| 76 |
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break;
|
| 77 |
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case 1:
|
| 78 |
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offset += file->f_pos;
|
| 79 |
|
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case 0:
|
| 80 |
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break;
|
| 81 |
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}
|
| 82 |
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if (offset < 0 || offset > size)
|
| 83 |
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return -EINVAL;
|
| 84 |
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file->f_pos = offset;
|
| 85 |
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return file->f_pos;
|
| 86 |
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}
|
| 87 |
|
|
|
| 88 |
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/* We share this temporary buffer with the console write code
|
| 89 |
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* so that we can easily avoid touching user space while holding the
|
| 90 |
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* console spinlock.
|
| 91 |
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*/
|
| 92 |
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extern char con_buf[PAGE_SIZE];
|
| 93 |
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#define CON_BUF_SIZE PAGE_SIZE
|
| 94 |
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extern struct semaphore con_buf_sem;
|
| 95 |
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| 96 |
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static ssize_t
|
| 97 |
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vcs_read(struct file *file, char *buf, size_t count, loff_t *ppos)
|
| 98 |
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{
|
| 99 |
|
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struct inode *inode = file->f_dentry->d_inode;
|
| 100 |
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unsigned int currcons = MINOR(inode->i_rdev);
|
| 101 |
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long pos = *ppos;
|
| 102 |
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long viewed, attr, read;
|
| 103 |
|
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int col, maxcol;
|
| 104 |
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unsigned short *org = NULL;
|
| 105 |
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ssize_t ret;
|
| 106 |
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| 107 |
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down(&con_buf_sem);
|
| 108 |
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| 109 |
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/* Select the proper current console and verify
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| 110 |
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* sanity of the situation under the console lock.
|
| 111 |
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*/
|
| 112 |
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acquire_console_sem();
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| 113 |
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|
| 114 |
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attr = (currcons & 128);
|
| 115 |
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currcons = (currcons & 127);
|
| 116 |
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if (currcons == 0) {
|
| 117 |
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currcons = fg_console;
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| 118 |
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viewed = 1;
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| 119 |
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} else {
|
| 120 |
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currcons--;
|
| 121 |
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viewed = 0;
|
| 122 |
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}
|
| 123 |
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ret = -ENXIO;
|
| 124 |
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if (!vc_cons_allocated(currcons))
|
| 125 |
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goto unlock_out;
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| 126 |
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| 127 |
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ret = -EINVAL;
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| 128 |
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if (pos < 0)
|
| 129 |
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goto unlock_out;
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| 130 |
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read = 0;
|
| 131 |
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ret = 0;
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| 132 |
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while (count) {
|
| 133 |
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char *con_buf0, *con_buf_start;
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| 134 |
|
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long this_round, size;
|
| 135 |
|
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ssize_t orig_count;
|
| 136 |
|
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long p = pos;
|
| 137 |
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|
| 138 |
|
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/* Check whether we are above size each round,
|
| 139 |
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* as copy_to_user at the end of this loop
|
| 140 |
|
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* could sleep.
|
| 141 |
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*/
|
| 142 |
|
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size = vcs_size(inode);
|
| 143 |
|
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if (pos >= size)
|
| 144 |
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break;
|
| 145 |
|
|
if (count > size - pos)
|
| 146 |
|
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count = size - pos;
|
| 147 |
|
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|
| 148 |
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this_round = count;
|
| 149 |
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if (this_round > CON_BUF_SIZE)
|
| 150 |
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this_round = CON_BUF_SIZE;
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| 151 |
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|
| 152 |
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/* Perform the whole read into the local con_buf.
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| 153 |
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* Then we can drop the console spinlock and safely
|
| 154 |
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* attempt to move it to userspace.
|
| 155 |
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*/
|
| 156 |
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|
| 157 |
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con_buf_start = con_buf0 = con_buf;
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| 158 |
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orig_count = this_round;
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| 159 |
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maxcol = video_num_columns;
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| 160 |
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if (!attr) {
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| 161 |
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org = screen_pos(currcons, p, viewed);
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| 162 |
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col = p % maxcol;
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| 163 |
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p += maxcol - col;
|
| 164 |
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while (this_round-- > 0) {
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| 165 |
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*con_buf0++ = (vcs_scr_readw(currcons, org++) & 0xff);
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| 166 |
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if (++col == maxcol) {
|
| 167 |
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org = screen_pos(currcons, p, viewed);
|
| 168 |
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col = 0;
|
| 169 |
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p += maxcol;
|
| 170 |
|
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}
|
| 171 |
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}
|
| 172 |
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} else {
|
| 173 |
|
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if (p < HEADER_SIZE) {
|
| 174 |
|
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size_t tmp_count;
|
| 175 |
|
|
|
| 176 |
|
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con_buf0[0] = (char) video_num_lines;
|
| 177 |
|
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con_buf0[1] = (char) video_num_columns;
|
| 178 |
|
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getconsxy(currcons, con_buf0 + 2);
|
| 179 |
|
|
|
| 180 |
|
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con_buf_start += p;
|
| 181 |
|
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this_round += p;
|
| 182 |
|
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if (this_round > CON_BUF_SIZE) {
|
| 183 |
|
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this_round = CON_BUF_SIZE;
|
| 184 |
|
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orig_count = this_round - p;
|
| 185 |
|
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}
|
| 186 |
|
|
|
| 187 |
|
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tmp_count = HEADER_SIZE;
|
| 188 |
|
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if (tmp_count > this_round)
|
| 189 |
|
|
tmp_count = this_round;
|
| 190 |
|
|
|
| 191 |
|
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/* Advance state pointers and move on. */
|
| 192 |
|
|
this_round -= tmp_count;
|
| 193 |
|
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p = HEADER_SIZE;
|
| 194 |
|
|
con_buf0 = con_buf + HEADER_SIZE;
|
| 195 |
|
|
/* If this_round >= 0, then p is even... */
|
| 196 |
|
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} else if (p & 1) {
|
| 197 |
|
|
/* Skip first byte for output if start address is odd
|
| 198 |
|
|
* Update region sizes up/down depending on free
|
| 199 |
|
|
* space in buffer.
|
| 200 |
|
|
*/
|
| 201 |
|
|
con_buf_start++;
|
| 202 |
|
|
if (this_round < CON_BUF_SIZE)
|
| 203 |
|
|
this_round++;
|
| 204 |
|
|
else
|
| 205 |
|
|
orig_count--;
|
| 206 |
|
|
}
|
| 207 |
|
|
if (this_round > 0) {
|
| 208 |
|
|
unsigned short *tmp_buf = (unsigned short *)con_buf0;
|
| 209 |
|
|
|
| 210 |
|
|
p -= HEADER_SIZE;
|
| 211 |
|
|
p /= 2;
|
| 212 |
|
|
col = p % maxcol;
|
| 213 |
|
|
|
| 214 |
|
|
org = screen_pos(currcons, p, viewed);
|
| 215 |
|
|
p += maxcol - col;
|
| 216 |
|
|
|
| 217 |
|
|
/* Buffer has even length, so we can always copy
|
| 218 |
|
|
* character + attribute. We do not copy last byte
|
| 219 |
|
|
* to userspace if this_round is odd.
|
| 220 |
|
|
*/
|
| 221 |
|
|
this_round = (this_round + 1) >> 1;
|
| 222 |
|
|
|
| 223 |
|
|
while (this_round) {
|
| 224 |
|
|
*tmp_buf++ = vcs_scr_readw(currcons, org++);
|
| 225 |
|
|
this_round --;
|
| 226 |
|
|
if (++col == maxcol) {
|
| 227 |
|
|
org = screen_pos(currcons, p, viewed);
|
| 228 |
|
|
col = 0;
|
| 229 |
|
|
p += maxcol;
|
| 230 |
|
|
}
|
| 231 |
|
|
}
|
| 232 |
|
|
}
|
| 233 |
|
|
}
|
| 234 |
|
|
|
| 235 |
|
|
/* Finally, release the console semaphore while we push
|
| 236 |
|
|
* all the data to userspace from our temporary buffer.
|
| 237 |
|
|
*
|
| 238 |
|
|
* AKPM: Even though it's a semaphore, we should drop it because
|
| 239 |
|
|
* the pagefault handling code may want to call printk().
|
| 240 |
|
|
*/
|
| 241 |
|
|
|
| 242 |
|
|
release_console_sem();
|
| 243 |
|
|
ret = copy_to_user(buf, con_buf_start, orig_count);
|
| 244 |
|
|
acquire_console_sem();
|
| 245 |
|
|
|
| 246 |
|
|
if (ret) {
|
| 247 |
|
|
read += (orig_count - ret);
|
| 248 |
|
|
ret = -EFAULT;
|
| 249 |
|
|
break;
|
| 250 |
|
|
}
|
| 251 |
|
|
buf += orig_count;
|
| 252 |
|
|
pos += orig_count;
|
| 253 |
|
|
read += orig_count;
|
| 254 |
|
|
count -= orig_count;
|
| 255 |
|
|
}
|
| 256 |
|
|
*ppos += read;
|
| 257 |
|
|
if (read)
|
| 258 |
|
|
ret = read;
|
| 259 |
|
|
unlock_out:
|
| 260 |
|
|
release_console_sem();
|
| 261 |
|
|
up(&con_buf_sem);
|
| 262 |
|
|
return ret;
|
| 263 |
|
|
}
|
| 264 |
|
|
|
| 265 |
|
|
static ssize_t
|
| 266 |
|
|
vcs_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
|
| 267 |
|
|
{
|
| 268 |
|
|
struct inode *inode = file->f_dentry->d_inode;
|
| 269 |
|
|
unsigned int currcons = MINOR(inode->i_rdev);
|
| 270 |
|
|
long pos = *ppos;
|
| 271 |
|
|
long viewed, attr, size, written;
|
| 272 |
|
|
char *con_buf0;
|
| 273 |
|
|
int col, maxcol;
|
| 274 |
|
|
u16 *org0 = NULL, *org = NULL;
|
| 275 |
|
|
size_t ret;
|
| 276 |
|
|
|
| 277 |
|
|
down(&con_buf_sem);
|
| 278 |
|
|
|
| 279 |
|
|
/* Select the proper current console and verify
|
| 280 |
|
|
* sanity of the situation under the console lock.
|
| 281 |
|
|
*/
|
| 282 |
|
|
acquire_console_sem();
|
| 283 |
|
|
|
| 284 |
|
|
attr = (currcons & 128);
|
| 285 |
|
|
currcons = (currcons & 127);
|
| 286 |
|
|
|
| 287 |
|
|
if (currcons == 0) {
|
| 288 |
|
|
currcons = fg_console;
|
| 289 |
|
|
viewed = 1;
|
| 290 |
|
|
} else {
|
| 291 |
|
|
currcons--;
|
| 292 |
|
|
viewed = 0;
|
| 293 |
|
|
}
|
| 294 |
|
|
ret = -ENXIO;
|
| 295 |
|
|
if (!vc_cons_allocated(currcons))
|
| 296 |
|
|
goto unlock_out;
|
| 297 |
|
|
|
| 298 |
|
|
size = vcs_size(inode);
|
| 299 |
|
|
ret = -EINVAL;
|
| 300 |
|
|
if (pos < 0 || pos > size)
|
| 301 |
|
|
goto unlock_out;
|
| 302 |
|
|
if (count > size - pos)
|
| 303 |
|
|
count = size - pos;
|
| 304 |
|
|
written = 0;
|
| 305 |
|
|
while (count) {
|
| 306 |
|
|
long this_round = count;
|
| 307 |
|
|
size_t orig_count;
|
| 308 |
|
|
long p;
|
| 309 |
|
|
|
| 310 |
|
|
if (this_round > CON_BUF_SIZE)
|
| 311 |
|
|
this_round = CON_BUF_SIZE;
|
| 312 |
|
|
|
| 313 |
|
|
/* Temporarily drop the console lock so that we can read
|
| 314 |
|
|
* in the write data from userspace safely.
|
| 315 |
|
|
*/
|
| 316 |
|
|
release_console_sem();
|
| 317 |
|
|
ret = copy_from_user(con_buf, buf, this_round);
|
| 318 |
|
|
acquire_console_sem();
|
| 319 |
|
|
|
| 320 |
|
|
if (ret) {
|
| 321 |
|
|
this_round -= ret;
|
| 322 |
|
|
if (!this_round) {
|
| 323 |
|
|
/* Abort loop if no data were copied. Otherwise
|
| 324 |
|
|
* fail with -EFAULT.
|
| 325 |
|
|
*/
|
| 326 |
|
|
if (written)
|
| 327 |
|
|
break;
|
| 328 |
|
|
ret = -EFAULT;
|
| 329 |
|
|
goto unlock_out;
|
| 330 |
|
|
}
|
| 331 |
|
|
}
|
| 332 |
|
|
|
| 333 |
|
|
/* The vcs_size might have changed while we slept to grab
|
| 334 |
|
|
* the user buffer, so recheck.
|
| 335 |
|
|
* Return data written up to now on failure.
|
| 336 |
|
|
*/
|
| 337 |
|
|
size = vcs_size(inode);
|
| 338 |
|
|
if (pos >= size)
|
| 339 |
|
|
break;
|
| 340 |
|
|
if (this_round > size - pos)
|
| 341 |
|
|
this_round = size - pos;
|
| 342 |
|
|
|
| 343 |
|
|
/* OK, now actually push the write to the console
|
| 344 |
|
|
* under the lock using the local kernel buffer.
|
| 345 |
|
|
*/
|
| 346 |
|
|
|
| 347 |
|
|
con_buf0 = con_buf;
|
| 348 |
|
|
orig_count = this_round;
|
| 349 |
|
|
maxcol = video_num_columns;
|
| 350 |
|
|
p = pos;
|
| 351 |
|
|
if (!attr) {
|
| 352 |
|
|
org0 = org = screen_pos(currcons, p, viewed);
|
| 353 |
|
|
col = p % maxcol;
|
| 354 |
|
|
p += maxcol - col;
|
| 355 |
|
|
|
| 356 |
|
|
while (this_round > 0) {
|
| 357 |
|
|
unsigned char c = *con_buf0++;
|
| 358 |
|
|
|
| 359 |
|
|
this_round--;
|
| 360 |
|
|
vcs_scr_writew(currcons,
|
| 361 |
|
|
(vcs_scr_readw(currcons, org) & 0xff00) | c, org);
|
| 362 |
|
|
org++;
|
| 363 |
|
|
if (++col == maxcol) {
|
| 364 |
|
|
org = screen_pos(currcons, p, viewed);
|
| 365 |
|
|
col = 0;
|
| 366 |
|
|
p += maxcol;
|
| 367 |
|
|
}
|
| 368 |
|
|
}
|
| 369 |
|
|
} else {
|
| 370 |
|
|
if (p < HEADER_SIZE) {
|
| 371 |
|
|
char header[HEADER_SIZE];
|
| 372 |
|
|
|
| 373 |
|
|
getconsxy(currcons, header + 2);
|
| 374 |
|
|
while (p < HEADER_SIZE && this_round > 0) {
|
| 375 |
|
|
this_round--;
|
| 376 |
|
|
header[p++] = *con_buf0++;
|
| 377 |
|
|
}
|
| 378 |
|
|
if (!viewed)
|
| 379 |
|
|
putconsxy(currcons, header + 2);
|
| 380 |
|
|
}
|
| 381 |
|
|
p -= HEADER_SIZE;
|
| 382 |
|
|
col = (p/2) % maxcol;
|
| 383 |
|
|
if (this_round > 0) {
|
| 384 |
|
|
org0 = org = screen_pos(currcons, p/2, viewed);
|
| 385 |
|
|
if ((p & 1) && this_round > 0) {
|
| 386 |
|
|
char c;
|
| 387 |
|
|
|
| 388 |
|
|
this_round--;
|
| 389 |
|
|
c = *con_buf0++;
|
| 390 |
|
|
#ifdef __BIG_ENDIAN
|
| 391 |
|
|
vcs_scr_writew(currcons, c |
|
| 392 |
|
|
(vcs_scr_readw(currcons, org) & 0xff00), org);
|
| 393 |
|
|
#else
|
| 394 |
|
|
vcs_scr_writew(currcons, (c << 8) |
|
| 395 |
|
|
(vcs_scr_readw(currcons, org) & 0xff), org);
|
| 396 |
|
|
#endif
|
| 397 |
|
|
org++;
|
| 398 |
|
|
p++;
|
| 399 |
|
|
if (++col == maxcol) {
|
| 400 |
|
|
org = screen_pos(currcons, p/2, viewed);
|
| 401 |
|
|
col = 0;
|
| 402 |
|
|
}
|
| 403 |
|
|
}
|
| 404 |
|
|
p /= 2;
|
| 405 |
|
|
p += maxcol - col;
|
| 406 |
|
|
}
|
| 407 |
|
|
while (this_round > 1) {
|
| 408 |
|
|
unsigned short w;
|
| 409 |
|
|
|
| 410 |
|
|
w = get_unaligned(((const unsigned short *)con_buf0));
|
| 411 |
|
|
vcs_scr_writew(currcons, w, org++);
|
| 412 |
|
|
con_buf0 += 2;
|
| 413 |
|
|
this_round -= 2;
|
| 414 |
|
|
if (++col == maxcol) {
|
| 415 |
|
|
org = screen_pos(currcons, p, viewed);
|
| 416 |
|
|
col = 0;
|
| 417 |
|
|
p += maxcol;
|
| 418 |
|
|
}
|
| 419 |
|
|
}
|
| 420 |
|
|
if (this_round > 0) {
|
| 421 |
|
|
unsigned char c;
|
| 422 |
|
|
|
| 423 |
|
|
c = *con_buf0++;
|
| 424 |
|
|
#ifdef __BIG_ENDIAN
|
| 425 |
|
|
vcs_scr_writew(currcons, (vcs_scr_readw(currcons, org) & 0xff) | (c << 8), org);
|
| 426 |
|
|
#else
|
| 427 |
|
|
vcs_scr_writew(currcons, (vcs_scr_readw(currcons, org) & 0xff00) | c, org);
|
| 428 |
|
|
#endif
|
| 429 |
|
|
}
|
| 430 |
|
|
}
|
| 431 |
|
|
count -= orig_count;
|
| 432 |
|
|
written += orig_count;
|
| 433 |
|
|
buf += orig_count;
|
| 434 |
|
|
pos += orig_count;
|
| 435 |
|
|
if (org0)
|
| 436 |
|
|
update_region(currcons, (unsigned long)(org0), org-org0);
|
| 437 |
|
|
}
|
| 438 |
|
|
*ppos += written;
|
| 439 |
|
|
ret = written;
|
| 440 |
|
|
|
| 441 |
|
|
unlock_out:
|
| 442 |
|
|
release_console_sem();
|
| 443 |
|
|
|
| 444 |
|
|
up(&con_buf_sem);
|
| 445 |
|
|
|
| 446 |
|
|
return ret;
|
| 447 |
|
|
}
|
| 448 |
|
|
|
| 449 |
|
|
static int
|
| 450 |
|
|
vcs_open(struct inode *inode, struct file *filp)
|
| 451 |
|
|
{
|
| 452 |
|
|
unsigned int currcons = (MINOR(inode->i_rdev) & 127);
|
| 453 |
|
|
if(currcons && !vc_cons_allocated(currcons-1))
|
| 454 |
|
|
return -ENXIO;
|
| 455 |
|
|
return 0;
|
| 456 |
|
|
}
|
| 457 |
|
|
|
| 458 |
|
|
static struct file_operations vcs_fops = {
|
| 459 |
|
|
llseek: vcs_lseek,
|
| 460 |
|
|
read: vcs_read,
|
| 461 |
|
|
write: vcs_write,
|
| 462 |
|
|
open: vcs_open,
|
| 463 |
|
|
};
|
| 464 |
|
|
|
| 465 |
|
|
static devfs_handle_t devfs_handle;
|
| 466 |
|
|
|
| 467 |
|
|
void vcs_make_devfs (unsigned int index, int unregister)
|
| 468 |
|
|
{
|
| 469 |
|
|
#ifdef CONFIG_DEVFS_FS
|
| 470 |
|
|
char name[8];
|
| 471 |
|
|
|
| 472 |
|
|
sprintf (name, "a%u", index + 1);
|
| 473 |
|
|
if (unregister)
|
| 474 |
|
|
{
|
| 475 |
|
|
devfs_unregister ( devfs_find_handle (devfs_handle, name + 1, 0, 0,
|
| 476 |
|
|
DEVFS_SPECIAL_CHR, 0) );
|
| 477 |
|
|
devfs_unregister ( devfs_find_handle (devfs_handle, name, 0, 0,
|
| 478 |
|
|
DEVFS_SPECIAL_CHR, 0) );
|
| 479 |
|
|
}
|
| 480 |
|
|
else
|
| 481 |
|
|
{
|
| 482 |
|
|
devfs_register (devfs_handle, name + 1, DEVFS_FL_DEFAULT,
|
| 483 |
|
|
VCS_MAJOR, index + 1,
|
| 484 |
|
|
S_IFCHR | S_IRUSR | S_IWUSR, &vcs_fops, NULL);
|
| 485 |
|
|
devfs_register (devfs_handle, name, DEVFS_FL_DEFAULT,
|
| 486 |
|
|
VCS_MAJOR, index + 129,
|
| 487 |
|
|
S_IFCHR | S_IRUSR | S_IWUSR, &vcs_fops, NULL);
|
| 488 |
|
|
}
|
| 489 |
|
|
#endif /* CONFIG_DEVFS_FS */
|
| 490 |
|
|
}
|
| 491 |
|
|
|
| 492 |
|
|
int __init vcs_init(void)
|
| 493 |
|
|
{
|
| 494 |
|
|
int error;
|
| 495 |
|
|
|
| 496 |
|
|
error = devfs_register_chrdev(VCS_MAJOR, "vcs", &vcs_fops);
|
| 497 |
|
|
|
| 498 |
|
|
if (error)
|
| 499 |
|
|
printk("unable to get major %d for vcs device", VCS_MAJOR);
|
| 500 |
|
|
|
| 501 |
|
|
devfs_handle = devfs_mk_dir (NULL, "vcc", NULL);
|
| 502 |
|
|
devfs_register (devfs_handle, "0", DEVFS_FL_DEFAULT,
|
| 503 |
|
|
VCS_MAJOR, 0,
|
| 504 |
|
|
S_IFCHR | S_IRUSR | S_IWUSR, &vcs_fops, NULL);
|
| 505 |
|
|
devfs_register (devfs_handle, "a", DEVFS_FL_DEFAULT,
|
| 506 |
|
|
VCS_MAJOR, 128,
|
| 507 |
|
|
S_IFCHR | S_IRUSR | S_IWUSR, &vcs_fops, NULL);
|
| 508 |
|
|
|
| 509 |
|
|
return error;
|
| 510 |
|
|
}
|
