1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* drivers.c
* (C) Copyright 1999 Randy Dunlap.
* (C) Copyright 1999, 2000 Thomas Sailer <sailer@ife.ee.ethz.ch>. (proc file per device)
* (C) Copyright 1999 Deti Fliegl (new USB architecture)
*
* $id$
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*************************************************************
*
* 1999-12-16: Thomas Sailer <sailer@ife.ee.ethz.ch>
* Converted the whole proc stuff to real
* read methods. Now not the whole device list needs to fit
* into one page, only the device list for one bus.
* Added a poll method to /proc/bus/usb/devices, to wake
* up an eventual usbd
* 2000-01-04: Thomas Sailer <sailer@ife.ee.ethz.ch>
* Turned into its own filesystem
*
* $Id: drivers.c,v 1.3 2000/01/11 13:58:24 tom Exp $
*/
#include <linux/fs.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include "usb.h"
#include "usbdevice_fs.h"
/*****************************************************************/
/*
* Dump usb_driver_list.
*
* We now walk the list of registered USB drivers.
*/
static ssize_t usb_driver_read(struct file *file, char *buf, size_t nbytes, loff_t *ppos)
{
struct list_head *tmp = usb_driver_list.next;
char *page, *start, *end;
ssize_t ret = 0;
unsigned int pos, len;
if (*ppos < 0)
return -EINVAL;
if (nbytes <= 0)
return 0;
if (!access_ok(VERIFY_WRITE, buf, nbytes))
return -EFAULT;
if (!(page = (char*) __get_free_page(GFP_KERNEL)))
return -ENOMEM;
start = page;
end = page + (PAGE_SIZE - 100);
pos = *ppos;
for (; tmp != &usb_driver_list; tmp = tmp->next) {
struct usb_driver *driver = list_entry(tmp, struct usb_driver, driver_list);
start += sprintf (start, "%s\n", driver->name);
if (start > end) {
start += sprintf(start, "(truncated)\n");
break;
}
}
if (start == page)
start += sprintf(start, "(none)\n");
len = start - page;
if (len > pos) {
len -= pos;
if (len > nbytes)
len = nbytes;
ret = len;
if (copy_to_user(buf, page + pos, len))
ret = -EFAULT;
else
*ppos += len;
}
free_page((unsigned long)page);
return ret;
}
static long long usb_driver_lseek(struct file * file, long long offset, int orig)
{
switch (orig) {
case 0:
file->f_pos = offset;
return file->f_pos;
case 1:
file->f_pos += offset;
return file->f_pos;
case 2:
return -EINVAL;
default:
return -EINVAL;
}
}
struct file_operations usbdevfs_drivers_fops = {
usb_driver_lseek, /* lseek */
usb_driver_read, /* read */
NULL, /* write */
NULL, /* readdir */
NULL, /* poll */
NULL, /* ioctl */
NULL, /* mmap */
NULL, /* open */
NULL, /* flush */
NULL, /* release */
NULL /* fsync */
};
|
