124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
/*
|
|
* 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 <linux/smp_lock.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;
|
|
|
|
lock_kernel();
|
|
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) {
|
|
unlock_kernel();
|
|
return -EINVAL;
|
|
}
|
|
unlock_kernel();
|
|
return (file->f_pos = new);
|
|
}
|
|
|
|
static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
|
|
size_t nbytes, loff_t * ppos)
|
|
{
|
|
struct inode *ino = file->f_path.dentry->d_inode;
|
|
struct proc_dir_entry *dp = PDE(ino);
|
|
struct pnp_dev *dev = dp->data;
|
|
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;
|
|
}
|