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/*
* ISA Plug & Play support
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/isapnp.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <asm/uaccess.h>
extern struct pnp_protocol isapnp_protocol;
static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)
{
loff_t new = -1;
struct inode *inode = file_inode(file);
mutex_lock(&inode->i_mutex);
switch (whence) {
case 0:
new = off;
break;
case 1:
new = file->f_pos + off;
break;
case 2:
new = 256 + off;
break;
}
if (new < 0 || new > 256)
new = -EINVAL;
else
file->f_pos = new;
mutex_unlock(&inode->i_mutex);
return new;
}
static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
size_t nbytes, loff_t * ppos)
{
struct pnp_dev *dev = PDE_DATA(file_inode(file));
int pos = *ppos;
int cnt, size = 256;
if (pos >= size)
return 0;
if (nbytes >= size)
nbytes = size;
if (pos + nbytes > size)
nbytes = size - pos;
cnt = nbytes;
if (!access_ok(VERIFY_WRITE, buf, cnt))
return -EINVAL;
isapnp_cfg_begin(dev->card->number, dev->number);
for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
unsigned char val;
val = isapnp_read_byte(pos);
__put_user(val, buf);
}
isapnp_cfg_end();
*ppos = pos;
return nbytes;
}
static const struct file_operations isapnp_proc_bus_file_operations = {
.owner = THIS_MODULE,
.llseek = isapnp_proc_bus_lseek,
.read = isapnp_proc_bus_read,
};
static int isapnp_proc_attach_device(struct pnp_dev *dev)
{
struct pnp_card *bus = dev->card;
struct proc_dir_entry *de, *e;
char name[16];
if (!(de = bus->procdir)) {
sprintf(name, "%02x", bus->number);
de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
if (!de)
return -ENOMEM;
}
sprintf(name, "%02x", dev->number);
e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de,
&isapnp_proc_bus_file_operations, dev);
if (!e)
return -ENOMEM;
e->size = 256;
return 0;
}
int __init isapnp_proc_init(void)
{
struct pnp_dev *dev;
isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL);
protocol_for_each_dev(&isapnp_protocol, dev) {
isapnp_proc_attach_device(dev);
}
return 0;
}
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