87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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 <linux/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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return fixed_size_llseek(file, off, whence, 256);
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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 pnp_dev *dev = pde_data(file_inode(file));
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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(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 proc_ops isapnp_proc_bus_proc_ops = {
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.proc_lseek = isapnp_proc_bus_lseek,
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.proc_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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char name[16];
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if (!bus->procdir) {
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sprintf(name, "%02x", bus->number);
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bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
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if (!bus->procdir)
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return -ENOMEM;
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}
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sprintf(name, "%02x", dev->number);
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dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, bus->procdir,
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&isapnp_proc_bus_proc_ops, dev);
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if (!dev->procent)
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return -ENOMEM;
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proc_set_size(dev->procent, 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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