mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 08:30:54 +07:00
124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
/*
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* ISA Plug & Play support
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/isapnp.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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extern struct pnp_protocol isapnp_protocol;
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static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
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static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)
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{
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loff_t new = -1;
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struct inode *inode = file_inode(file);
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mutex_lock(&inode->i_mutex);
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switch (whence) {
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case 0:
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new = off;
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break;
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case 1:
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new = file->f_pos + off;
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break;
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case 2:
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new = 256 + off;
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break;
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}
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if (new < 0 || new > 256)
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new = -EINVAL;
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else
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file->f_pos = new;
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mutex_unlock(&inode->i_mutex);
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return new;
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}
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static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
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size_t nbytes, loff_t * ppos)
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{
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struct inode *ino = file_inode(file);
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struct proc_dir_entry *dp = PDE(ino);
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struct pnp_dev *dev = dp->data;
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int pos = *ppos;
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int cnt, size = 256;
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if (pos >= size)
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return 0;
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if (nbytes >= size)
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nbytes = size;
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if (pos + nbytes > size)
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nbytes = size - pos;
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cnt = nbytes;
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if (!access_ok(VERIFY_WRITE, buf, cnt))
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return -EINVAL;
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isapnp_cfg_begin(dev->card->number, dev->number);
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for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
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unsigned char val;
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val = isapnp_read_byte(pos);
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__put_user(val, buf);
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}
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isapnp_cfg_end();
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*ppos = pos;
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return nbytes;
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}
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static const struct file_operations isapnp_proc_bus_file_operations = {
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.owner = THIS_MODULE,
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.llseek = isapnp_proc_bus_lseek,
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.read = isapnp_proc_bus_read,
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};
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static int isapnp_proc_attach_device(struct pnp_dev *dev)
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{
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struct pnp_card *bus = dev->card;
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struct proc_dir_entry *de, *e;
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char name[16];
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if (!(de = bus->procdir)) {
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sprintf(name, "%02x", bus->number);
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de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
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if (!de)
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return -ENOMEM;
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}
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sprintf(name, "%02x", dev->number);
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e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de,
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&isapnp_proc_bus_file_operations, dev);
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if (!e)
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return -ENOMEM;
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e->size = 256;
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return 0;
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}
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int __init isapnp_proc_init(void)
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{
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struct pnp_dev *dev;
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isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL);
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protocol_for_each_dev(&isapnp_protocol, dev) {
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isapnp_proc_attach_device(dev);
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}
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return 0;
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}
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