proc.c revision 271a15eabe094538d958dc68ccfc9c36b699247a 
1/*
2 *  ISA Plug & Play support
3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *   This program is free software; you can redistribute it and/or modify
6 *   it under the terms of the GNU General Public License as published by
7 *   the Free Software Foundation; either version 2 of the License, or
8 *   (at your option) any later version.
9 *
10 *   This program is distributed in the hope that it will be useful,
11 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 *   GNU General Public License for more details.
14 *
15 *   You should have received a copy of the GNU General Public License
16 *   along with this program; if not, write to the Free Software
17 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20#include <linux/module.h>
21#include <linux/isapnp.h>
22#include <linux/proc_fs.h>
23#include <linux/init.h>
24#include <asm/uaccess.h>
25
26extern struct pnp_protocol isapnp_protocol;
27
28static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
29
30static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)
31{
32	loff_t new = -1;
33	struct inode *inode = file_inode(file);
34
35	mutex_lock(&inode->i_mutex);
36	switch (whence) {
37	case 0:
38		new = off;
39		break;
40	case 1:
41		new = file->f_pos + off;
42		break;
43	case 2:
44		new = 256 + off;
45		break;
46	}
47	if (new < 0 || new > 256)
48		new = -EINVAL;
49	else
50		file->f_pos = new;
51	mutex_unlock(&inode->i_mutex);
52	return new;
53}
54
55static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
56				    size_t nbytes, loff_t * ppos)
57{
58	struct pnp_dev *dev = PDE_DATA(file_inode(file));
59	int pos = *ppos;
60	int cnt, size = 256;
61
62	if (pos >= size)
63		return 0;
64	if (nbytes >= size)
65		nbytes = size;
66	if (pos + nbytes > size)
67		nbytes = size - pos;
68	cnt = nbytes;
69
70	if (!access_ok(VERIFY_WRITE, buf, cnt))
71		return -EINVAL;
72
73	isapnp_cfg_begin(dev->card->number, dev->number);
74	for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
75		unsigned char val;
76		val = isapnp_read_byte(pos);
77		__put_user(val, buf);
78	}
79	isapnp_cfg_end();
80
81	*ppos = pos;
82	return nbytes;
83}
84
85static const struct file_operations isapnp_proc_bus_file_operations = {
86	.owner	= THIS_MODULE,
87	.llseek = isapnp_proc_bus_lseek,
88	.read = isapnp_proc_bus_read,
89};
90
91static int isapnp_proc_attach_device(struct pnp_dev *dev)
92{
93	struct pnp_card *bus = dev->card;
94	struct proc_dir_entry *de, *e;
95	char name[16];
96
97	if (!(de = bus->procdir)) {
98		sprintf(name, "%02x", bus->number);
99		de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
100		if (!de)
101			return -ENOMEM;
102	}
103	sprintf(name, "%02x", dev->number);
104	e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de,
105			&isapnp_proc_bus_file_operations, dev);
106	if (!e)
107		return -ENOMEM;
108	proc_set_size(e, 256);
109	return 0;
110}
111
112int __init isapnp_proc_init(void)
113{
114	struct pnp_dev *dev;
115
116	isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL);
117	protocol_for_each_dev(&isapnp_protocol, dev) {
118		isapnp_proc_attach_device(dev);
119	}
120	return 0;
121}
122