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	return fixed_size_llseek(file, off, whence, 256);
33}
34
35static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
36				    size_t nbytes, loff_t * ppos)
37{
38	struct pnp_dev *dev = PDE_DATA(file_inode(file));
39	int pos = *ppos;
40	int cnt, size = 256;
41
42	if (pos >= size)
43		return 0;
44	if (nbytes >= size)
45		nbytes = size;
46	if (pos + nbytes > size)
47		nbytes = size - pos;
48	cnt = nbytes;
49
50	if (!access_ok(VERIFY_WRITE, buf, cnt))
51		return -EINVAL;
52
53	isapnp_cfg_begin(dev->card->number, dev->number);
54	for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
55		unsigned char val;
56		val = isapnp_read_byte(pos);
57		__put_user(val, buf);
58	}
59	isapnp_cfg_end();
60
61	*ppos = pos;
62	return nbytes;
63}
64
65static const struct file_operations isapnp_proc_bus_file_operations = {
66	.owner	= THIS_MODULE,
67	.llseek = isapnp_proc_bus_lseek,
68	.read = isapnp_proc_bus_read,
69};
70
71static int isapnp_proc_attach_device(struct pnp_dev *dev)
72{
73	struct pnp_card *bus = dev->card;
74	struct proc_dir_entry *de, *e;
75	char name[16];
76
77	if (!(de = bus->procdir)) {
78		sprintf(name, "%02x", bus->number);
79		de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
80		if (!de)
81			return -ENOMEM;
82	}
83	sprintf(name, "%02x", dev->number);
84	e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de,
85			&isapnp_proc_bus_file_operations, dev);
86	if (!e)
87		return -ENOMEM;
88	proc_set_size(e, 256);
89	return 0;
90}
91
92int __init isapnp_proc_init(void)
93{
94	struct pnp_dev *dev;
95
96	isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL);
97	protocol_for_each_dev(&isapnp_protocol, dev) {
98		isapnp_proc_attach_device(dev);
99	}
100	return 0;
101}
102